Custom lithium battery pack is becoming increasingly popular in today’s technology-driven world. The Custom Lithium Battery Pack ese packs are designed and built to meet the specific needs of individual customers, providing them with a custom-made solution for their specific application. Custom lithium battery packs offer a number of advantages over traditional battery packs, Custom Lithium Battery Pack including higher energy density, longer lifespan, and better safety performance. In this article, we will explore the benefits of custom lithium battery packs and how they can be used to meet the unique needs of individual customers.
One of the primary benefits of custom lithium battery packs is their high energy density. These packs typically provide Custom Lithium Battery Pack higher energy output than traditional battery packs, making them well-suited for applications that require a large amount of power, such as electric vehicles and power tools. Additionally, custom lithium battery packs also provide excellent performance in terms of power output and rechargeability, making them a cost-effective solution for meeting the power needs of various applications.
Another advantage of custom lithium battery packs is their long lifespan. These packs typically offer a longer lifespan than traditional battery packs, providing users with a long-term solution for their application. Additionally, custom lithium battery packs also provide excellent safety performance, making them a safer option for use in various applications.
Custom lithium battery packs are also designed to meet the specific needs of individual customers. These packs can be custom-built to meet the power requirements of various applications, including electric vehicles, power tools, and other consumer electronics. Additionally, custom lithium battery packs can also be designed to meet the specific needs of industrial applications, such as wind turbines and other large-scale energy systems.
In conclusion, custom lithium battery packs provide a number of advantages over traditional battery packs, including higher energy density, longer lifespan, and better safety performance. These packs are designed to meet the specific needs of individual customers, making them a cost-effective and safer option for meeting the power needs of various applications. As technology continues to advance and demand for energy-efficient solutions increases, custom lithium battery packs are expected to become even more popular in the future.
If you have any question, please feel free to contact us:
As technology and device performance continue to advance, our need for power is also growing. However, for many devices, battery life and performance are still major factors limiting their overall user experience. In this regard, 12V lead acid replacement battery is emerging as a potential solution that provides customers with reliable and long-lasting portable power.
It is a high-quality replacement designed specifically for standard 12V lead acid batteries. This new battery not only fits into the same size category as a standard lead acid battery but also provides unparalleled performance and extended runtime without sacrificing stability or dependability.
Apart from its enhanced performance, It also boasts higher efficiency. This new battery has a power output of up to 60%, which is significantly higher than standard batteries. This means that users can rely on this new battery for longer runtimes, improved performance, and less frequent replacements.
It is worth mentioning that the 12V lead acid replacement battery not only breaks new ground in performance and lifespan but also focuses on environmental friendliness. The packaging of this battery is fully recyclable, and the battery itself is made from recyclable materials. This not only ensures that the battery performs well but also meets the increasing demands for greener electronics solutions.
Moreover, the 12V lead acid replacement battery has excellent compatibility. It can be used in a wide range of devices that support 12V lead acid batteries. Whether it’s a car, motorcycle, or any other device that requires a 12V power source, this new battery can provide reliable power supply. This makes it an ideal portable power solution for various devices.
Overall, the 12V lead acid replacement battery represents a significant advancement in our portable power solutions. This new technology addresses the issues of limited battery life and performance while also aligning with environmental trends for a greener and more sustainable future. It will undoubtedly enhance the overall user experience and convenience of our daily lives.
If you have any question, please feel free to contact us:
Name: Dawn Zeng (Director)
E-mail address: sales@himaxelectronics.com
https://himaxelectronics.com/wp-content/uploads/2020/11/4-2.jpg10001000administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2023-09-11 03:19:232024-04-26 07:09:2612V Lead Acid Replacement Battery: Understanding the Future of Portable Power
Lithium (Li), as the charge carrier in traditional li ion customized battery packs and emerging lithium metal batteries, has always been an indispensable medium to ensure battery operation. However, battery energy, longevity, and safety improvements are urgently needed in various applications, including electric vehicles and grid energy storage. Currently, inactive lithium (dead lithium) in the form of a solid electrolyte interface phase (SEI) and metallic lithium that loses contact with the electrode and loses the conductive path are considered to be the main reasons for capacity fading and insufficient life. It depends largely on the nature of SEI on the negative electrode surface for these unfavorable factors.he volume change of lithium during cycling causes the SEI to rupture, fresh lithium is exposed to the electrolyte again to form a new SEI. Such repeated damage/repair of the SEI makes the previously used strategies to improve SEI stability unavailable. In addition, the potential relationship between SEI film fragments (dead SEI) and metallic lithium due to electrode disengagement and loss of conductive pathways is unclear, making clarifying strategies to suppress dead lithium to prevent battery failure more challenging.
In view of this, the team of Professor Tao Xinyong of Zhejiang University of Technology and Professor Lu Jun of Argonne National Laboratory (co-corresponding author) quantified the Li2O content in the SEI layer based on the recent understanding that Li2O dominates SEI on lithium metal anodes. More importantly, the team revealed the correlation between SEI film fragmentation and dead lithium and showed that lithium loss in the SEI and dead lithium fragmentation are major causes of expected performance degradation in lithium metal batteries.
Based on such findings, the team proposed a method to reduce SEI fragment content through the redox reaction of iodine mediator (I3-/I-), which can effectively activate electrochemistry in dead SEI and Inactive lithium. The proposed Li2O transfer from the dead SEI to the newly exposed lithium surface not only effectively eliminates the accumulation of dead SEI and lithium metal fragments during lithium deposition/stripping cycles but also significantly suppresses the highly active metal-induced electrolyte decomposition in batteries.
The team used biomass materials as carbon sources to prepare carbon-loaded iodine capsules (ICPC) and found that I3-/I- spontaneous redox can effectively restore dead lithium to compensate for lithium loss. Notably, the deactivated lithium in LiO of dead SEI and deceased lithium metal fragments are transferred to the high-voltage cathode and subsequently recycled to compensate for the loss of lithium, thereby significantly improving the cycle reversibility of lithium metal batteries. The electrochemical performance shows that lithium metal total cells based on limited li ion customized battery packs exhibit ultrahigh performance (1000 cycle life and high Coulombic efficiency of 99.9%); using this strategy to match LiFePO4 (LFP) and LiNi0.8Co0.1Co0.1Mn0 .1O2 (NCM811) and other commercial cathode-assembled button and pouch batteries have shown very encouraging cycle performance and ultra-high efficiency. Therefore, this strategy opens up new avenues for mitigating the capacity fading caused by inactive lithium supply of lithium metal batteries and improving their cycle life, and also for other anode materials challenged by dead SEI and dead lithium, such as silicon, tin, alloys, etc., providing the possibility of large-scale application. Related research results, “Rejuvenating dead lithium supply in lithium metal anodes by iodine redox,” were published in Nature Energy.
If you have any question, please feel free to contact us:
Name: Dawn Zeng (Director)
E-mail address: sales@himaxelectronics.com
https://himaxelectronics.com/wp-content/uploads/2021/04/lifepo4-battery-9.6V.jpg800800administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2023-09-08 02:48:162024-04-26 07:53:50A new way to deal with the fading capacity of Lihium metal battery caused by dead lithium
Currently, lithium-ion batteries are used in industrial equipment in various industries. Since there are no fixed custom lithium battery pack specifications and size requirements in various industrial fields. Therefore, there are no conventional lithium batteries for industrial equipment and they all need to be customized. So how long does it take to make li ion customized battery packs?
Under normal conditions, it takes about 15 days to custom lithium battery pack;
Day 1: After receiving the order requirements, the R&D personnel evaluate the order requirements, quote samples and establish customized product projects.
Day 2: Selection and circuit design for product battery cells
Day 3: Make a structural drawing and confirm with the customer, and conduct business negotiations
Day 4: Start material selection, BMS protection board design, battery assembly, cycle charge and discharge, circuit and other tests and debugging verification
Then the packaging, warehousing, quality inspection, outbound delivery, and transportation to the customer are carried out, and the customer conducts sample testing and other work. Under normal circumstances, it takes about 15 working days.
Our lithium battery assembly is not like a small workshop where unknown batteries and BMS protection boards are directly packaged in series and parallel and shipped without testing and verification. This kind of battery is generally a price war. The price of the battery is very low and there is no after-sales guarantee. Basically, it is a one-time business. We will conduct strict testing on all materials, including battery cells, BMS, power harnesses and plugs. All materials must pass the inspection before they can be used to make li ion customized battery packs .
HIMAX is a manufacturer specializing in Li-ion Battery Pack Manufacturing. The batteries are widely used in special equipment, medical equipment, emergency firefighting, security communications, exploration and mapping, instrumentation and other fields. With more than 12 years of manufacturer production experience, Reliable quality.
If you have any question, please feel free to contact us:
Name: Dawn Zeng (Director)
E-mail address: sales@himaxelectronics.com
https://himaxelectronics.com/wp-content/uploads/2021/03/14.8v-2500mah.jpg750750administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2023-09-07 00:48:412024-04-26 08:46:41How long does it takes to Custom Lithium Battery Pack
Thank you for your long-term support and trust in Shenzhen Himax Electronics!
We are going to attend HKTDC Hong Kong Electronics Fair (Spring Edition) 2023 at Hong Kong Convention and Exhibition Center in Wanchai, Hong Kong, and we hope to discuss and communicate with you through this opportunity so that we can cooperate more deeply. Together to develop and occupy the market. We sincerely invite you to visit us, we are honored!
Company Name: Shenzhen Himax Electronics Co.
Stand No(s): 5E-A02
Show Dates: 12th-15th April
Venue: Booth 5E-A02, Hall 5th, Hong Kong Convention and Exhibition Center, 1 Expo Dr, Wan Chai, Hong Kong.
Name of Show: HKTDC Hong Kong Electronics Fair (Spring Edition) 2023
We believe this exhibition will bring you a lot of satisfaction, and there will be an extra discount for your order during the show.
Contact: Dawn
TEL: 0452 268 938
E-mail: sales@himaxelectronics.com
/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.png00administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2023-02-21 09:03:042024-04-26 06:10:20HKTDC Hong Kong Electronics Fair (Spring Edition) 2023
“Australia’s largest and most anticipated clean energy event.”
All-Energy Australia is the country’s most anticipated event in the clean energy sector’s annual calendar. It is free-to-attend, business-to-business conference and networking forum hosted alongside an impressive exhibition showcasing renewable energy, clean energy, sustainable transport, and energy efficiency. OVER 250 Exhibitors!
Himax battery also participated in this exhibition, if you want to know more then come with us!
All-Energy Australia Date: 26-27 October 2022 Location: MCEC, Melbourne
Stand: GG140 Company Name：HIMAX ELECTRONICS PTY LTD
Looking forward to meeting you
https://himaxelectronics.com/wp-content/uploads/2022/08/QQ图片20220802113452.jpg577577administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2022-08-02 03:54:292024-04-29 02:40:06Himax invites you to participate in All-Energy Australia
Part of RV ownership is maintenance. In this video, we replace our motorhome’s 4 house batteries and talk about some things we’ve learned about battery maintenance. We hope that you can learn from our mistakes to get the most out of your RV’s battery life. We replaced 4 6-volt golf cart batteries with 4 new 6-volt golf cart batteries. We did a lot of research to decide what batteries to buy and we learned a few things along the way.
Tips for Replacing Your RV’s House Batteries
Study Your Battery Bank Before You Start! Before you begin removing your old house batteries, be sure that you take pictures of the compartment so that you can see how everything is connected. Some RV battery bays are pretty tight and it can be difficult to see everything in the back, so be sure to snap some photos in the back of the bay as well. We’d also suggest drawing a simple diagram to remind you of how the batteries are positioned, where the positive and negative terminals are located and which cables connect to what so that you can be sure all of your cables will reach what they need to.
Decide What Type of Battery is Right For You There are three main types of batteries used for RV house batteries: traditional lead acid (also called flooded cell batteries), AGM (which stands for Absorbed Glass Mat or sometimes Absorbent Glass Mat depending on where you look), and Lithium. The type of batteries you choose can be based on price, space, power needs and how you use your RV. Whichever you decide to go with, all of your batteries should be the same type, size and age. Be consistent.
Save Money By Recycling Retailers today will charge a “core” fee when you are buying batteries. This is a recycling fee that is placed on every battery. We avoided this fee by giving them our old batteries when we bought the new ones.
Not All Batteries Are Created Equal Do your research ahead of time to determine what will be right for your needs. RV House Batteries are available in 6-volt and 12-volt and in a wide variety of amperages. Know what you currently have and how that works out for you. And spend some time doing some research online to narrow down what you are looking for so you aren’t wasting gas running all over town. And remember, 6-volt batteries will be connected differently than 12-volt batteries. So, again, pay close attention to how your batteries are connected.
Using Our Battery Quick Fill System to Top Off Our House Batteries
If You Choose Lead Acid Batteries You will need to maintain the level of distilled water in your batteries. This can be a pain in the butt if some of your batteries are difficult to access. Since 2014, we have used a battery quick fill system to easily and quickly add distilled water to our house batteries. The filling tubes stay connected at all times. When it’s time to check the water level, we connect the end of that tube to our hand pump which has another tube that we put down into the bottle of distilled water. All we have to do is squeeze the pump a a few times. It tops off all of our house batteries simultaneously and will not allow them to overfill. It is really super simple and we highly recommend it. As long as we have lead acid batteries in our RV, we will use a battery quick fill system! Here’s one like ours if you’d like to get one for yourself: Flow-Rite RV2000 RV Edition 2 Battery Kit. (We have 2 of these since we have 4 6-volt house batteries.)
Types of RV House Batteries
Lead Acid Batteries Also called “flooded cell” batteries, lead acid batteries are the least expensive option for replacing the house battery bank in most RVs. They are also the most common type of battery you’ll probably find in most campers. The price is nice (especially when you are replacing multiple batteries), but there are a few downsides to lead acid batteries. They require more maintenance than the other types of batteries. As we mentioned above, you have to keep a close eye on the fluid levels of these batteries. Low fluid levels can affect performance and may significantly shorten your battery’s life. With the quick fill system we suggest above this is super easy to do, but you have to remember to perform this maintenance regularly.
You also want to keep an eye on the charge level of your lead acid batteries. We’ve read that allowing the battery charge level to drop below 50% will potentially damage the battery and shorten its life. This isn’t a problem when you are plugged into shore power, but be very mindful of your charge levels if you are boondocking and be sure to check on your batteries regularly when your RV is in storage! Lead acid batteries will lose their charge in storage even if you have disconnected them.
AGM Batteries Absorbed Glass Mat batteries are sealed and do not require you to add distilled water. So they require a little less maintenance than lead acid batteries, but they are also more expensive. You still need to monitor your charge levels just like you would with lead acid batteries. Just like their lead acid cousins, AGM batteries will lose their charge in storage even when disconnected.
We’ve read reports that say that AGM batteries may recharge more quickly than lead acid, but they may also be more sensitive to overcharging. Some articles we read also said that AGMs might be more sensitive to temperature changes than their lead acid counterparts.
Lithium Batteries The newest option (and the technology that seems to be quickly changing at the moment) is lithium. Lithium batteries are a lot more expensive than the other options. Traditionally, they are sized completely differently than most RV house batteries and have been known to be very sensitive to temperature. However, they are lighter in weight (which is always a good thing in RVs!), more powerful, and can use up more of their charge without risking damage to the life of the battery.
We’ve read that the latest chemistries in lithium batteries for RVs are less sensitive to temperature changes and allow the batteries to maintain their charge in storage for up to a year! When we were doing our research, we came across some new lithium batteries that were sized just like the 6-volt golf cart batteries (GC2) we currently have, so they would have worked easily with our existing battery location and brackets.
Tips for Maintaining Your RV’s Batteries
Keep An Eye On the Water Levels We can’t stress this one enough! If you have lead acid batteries, like us, then you have to maintain the distilled water levels of your batteries. Start checking those water levels as soon as you buy your RV. Even brand new RVs can have batteries without sufficient water. (Maybe that particular RV has been on the lot for a little while?) Never assume what your RV has been through before you found it. Be consistent about checking the fluid levels and maintain them easily with a Flow-Rite battery quick fill system. (Have we told you how much we love ours? It has saved us a ton of head bumping and unmentionable language over the years!) 🙂
Use a Trickle Charge If you have access to a standard 110 power plug, you can use a Camco 30amp to 15amp Adapter or a Camco 50amp to 15amp Dogbone Adapter to trickle charge your RV’s house batteries while it is in storage. However, do not assume that it is charging just because you have it plugged in. If the power to your storage area fails for any reason, your RV batteries may end up discharging instead of charging. This happened to us twice. So always go back within 24 hours after you plug in to trickle charge to check on your batteries. We’ve read that your batteries should be fully charged within that 24 hours, so you’ll want to unplug them and disconnect them at that point anyway. (especially if you do not have a good energy management system to keep your batteries from overcharging)
Don’t Assume Anything We have learned this the hard way! The batteries are the heart of your RV. There is nothing worse than getting ready for a camping trip only to find that your batteries are low or dead. Be proactive in maintaining your batteries and you will never be surprised. This is especially true for part-time or seasonal RVers. Be sure you check on your batteries regularly. Don’t assume anything when it comes to them.
Disconnect the Batteries When Not Using or Charging If you are storing your RV, even for a few days, and you will not be trickle charging the batteries, be sure to disconnect them. For our travel trailer, this meant physically disconnecting the battery cable. In our motorhome, it means that we set the inside battery button to “Store” and the chassis battery switch inside our battery bay to “Off”. We’ve also learned to check to make sure the Inverter/Charge Controller is turned off before we set these battery switches. But remember, lead acid and AGM batteries will still lose some of their charge even when they are disconnected. So be sure to come back to check on them at least every couple of weeks.
Use Your RV As Often As Possible! RV batteries like to be used, so try to get out and go camping as often as possible (as if you need another excuse, right?). It’s also easier to remember to check and maintain your batteries when you are using it than when it is in storage away from you.
Battery capacity (how many amp-hours it can hold) is reduced as temperature goes down, and increased as temperature goes up. This is why your car battery dies on a cold winter morning, even though it worked fine the previous afternoon. If your batteries spend part of the year shivering in the cold, the reduced capacity has to be taken into account when sizing the system batteries. The standard rating for batteries is at room temperature 25 degrees C (about 77 F). At approximately -22 degrees F (-30 C), battery Ah capacity drops to 50%. At freezing, capacity is reduced by 20%. Capacity is increased at higher temperatures – at 122 degrees F, battery capacity would be about 12% higher.
Wide temperature variations
Battery charging voltage also changes with temperature. It will vary from about 2.74 volts per cell (16.4 volts) at -40 C to 2.3 volts per cell (13.8 volts) at 50 C. This is why you should have temperature compensation on your lead-acid battery charger or charge control if your batteries are outside and/or subject to wide temperature variations.
Internal temperature of a battery
Thermal mass means that because they have so much mass, they will change internal temperature much slower than the surrounding air temperature. A large insulated battery bank may vary as little as 10 degrees over 24 hours internally, even though the air temperature varies from 20 to 70 degrees. For this reason, external (add-on) temperature sensors should be attached to one of the POSITIVE plate terminals, and bundled up a little with some type of insulation on the terminal. The sensor will then read very close to the actual internal battery temperature.
Battery life reduces at higher temperatures
Even though battery capacity at high temperatures is higher, battery life is shortened. Battery capacity is reduced by 50% at -22 degrees F – but battery LIFE increases by about 60%. Battery life is reduced at higher temperatures – for every 15 degrees F over 77, battery life is cut in half. This holds true for ANY type of lead-acid battery, whether sealed, Gel, AGM, industrial or whatever. This is actually not as bad as it seems, as the battery will tend to average out the good and bad times.
One last note on temperatures – in some places that have extremely cold or hot conditions, batteries may be sold locally that are NOT standard electrolyte (acid) strengths. The electrolyte may be stronger (for cold) or weaker (for very hot) climates. In such cases, the specific gravity and the voltages may vary from what we show.
Now we have launched a low temperature battery, HiMASSi Smart & Temp battery, which supports charging at -31 ℉.
Welcome to consult! (sales6@himaxelectronics.com).
/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.png00administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2021-11-24 02:29:532024-04-28 15:29:49Temperature effects on batteries
By now, the winter has been successful in many areas. Climate experts predict that the cold air may hit us frequently this winter, and we have ourselves prepared to prevent the cold. Will the batteries, the essential energy supply, and the energy storage device that we live in, also be prepared for the cold days?
For example, in terms of the necessary phone, a fully charged cell phone flies from a warm place to the cold north, when off the plane its power drops sharply or immediately shows “low power for low temperature, automatic shut”. Not only unpaid but also the temperature defeats it. when the phone battery encounters a low temperature beyond its acceptable range, it stops running (also phone freezing phenomenon) so that the mobile phone powers down or automatically off. Knowing the temperature accepted by our batteries is necessary.
Picture 1: Batteries power our life.
Battery classificationon the temperature
Normal temperature battery
This kind of battery is just like humans who enjoy the temperature indoor. Its operating temperature range is generally 0℃~60℃. Under normal circumstances, the temperature is about 45℃, if it exceeds 50 degrees, it will be very hot, and the battery will be easy to age and scrap, such as our commonly used mobile phone battery, mobile power supply, etc. If below minus 20℃, the device with it can’t work normally and it easily ages too.
High-temperature battery
The High-temperature battery uses a solid and inactive electrolyte at a normal ambient temperature. It can only become active at high temperatures by heating from the outside, which is used almost exclusively for military applications.
Low-temperature battery
A low-temperature battery is a battery with strong freezing capacity by adding resistance to the conventional ones and production research and development of technology. Because of the performance advantages of lithium-ion itself, it has become the protagonist in both the institute and the market.
Wide temperature battery
Wide temperature battery with a larger operating temperature range always over 100℃ （like -40℃-80℃ Ni-MH battery）can be applied to other harsh environmental fields such as petroleum drilling and aerospace.
Treat the effect of temperature on the battery
How to maintain the mobile phone in winter?
We have no idea to replace the battery of our mobile phones. But we have some tips to protect it from cold damage:
Before being out
Equip the phone with a thicker and warmer phone case (Picture 2 ).
Stick the mobile phone membrane for anti-static electricity.
Prepare a charging bank and the line.
Picture 2: Equip our electronics against this winter.
When staying outdoor
Put it into a pocket (inside the clothes) or bag to keep warm.
Use the headphones instead of releasing the sound out and shorten the outdoor-use time.
No mobile phone for a large temperature difference.
Do not start it up immediately after an automatic shut down until the temperature of the phone becomes normal.
Choose the correct battery to avoid unnecessary trouble
The battery activity is reduced for the low temperature, which affects charging and limits the use of electricity. If we are going to have a new product. the battery choosing must be taken seriously. When we have to get outdoor to a temperature under 40℃， low-temperature polymer lithium batteries can be your best choice. Maybe you need a battery for your device to climb a mountain or other unique demand. Specializes in battery solutions against different temperatures. There are more suggestions for you, just click here to know more or contact us.
https://himaxelectronics.com/wp-content/uploads/2021/11/low-temperature-polymer-lithium-batteries.jpg400800administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2021-11-03 04:00:432024-04-26 06:09:57Is your battery ready for this winter?
Definition of Series and Parallel Connection of Lithium Batteries
Due to the limited voltage and capacity of the single battery cell, the series and parallel connection is needed in the actual use to obtain higher voltage and capacity, so as to meet the actual power demand of the equipment.
Lithium batteries connected in series
Add the voltage of batteries, capacity remains the same, and internal resistance increases.
Lithium batteries connected in paralle
Constant voltage, added capacity, reduced internal resistance, and extended power supply time.
Lithium batteries connected in series and parallel
3.7V single battery can be assembled into battery pack with a voltage of 3.7*(N)V as required (N: number of single batteries)
For example, 7.4V, 12V, 24V, 36V, 48V, 60V, 72V, etc.
Capacity of Parallel Connection
2000mAh single battery can be assembled into a battery pack with capacity of 2*(N)Ah as required (N: number of single batteries)
For example, 4000mAh, 6000mAh, 8000mAh,5Ah, 10Ah, 20Ah, 30Ah, 50Ah, 100Ah, etc.
Lithium Battery Pack
Lithium battery pack technique refers to the processing, assembly and packaging of lithium battery pack. The process of assembling lithium cells together is called PACK, which can be a single battery or a lithium battery pack connected in series or parallel. The lithium battery pack usually consists of a plastic case, PCM, cell, output electrode, bonding sheet, and other insulating tape, double-coating tape, etc.
Lithium cell: The core of a finished battery
PCM: Protection functions of over charge, over discharge, over current, short circuit, NTC intelligent temperature control.
Plastic case: the supporting skeleton of the entire battery; Position and fix the PCM; Carry all other non-case parts and limit.
Terminal lead: It can provide a variety of terminal wire charging and discharging interface for a variety of electronic products, energy storage products and backup power.
Nickel sheet/bracket: Connection and fixing component of the cell
Lithium Battery Series and Parallel Connection
Due to security reasons, lithium ion batteries need an external PCM used for battery monitoring for each battery. It is not recommended to use batteries in parallel. If connect in parallel, make sure the consistency of the battery parameters (capacity, internal resistance, etc.), the other batteries in series need to have consistent parameters, otherwise, the performance of the battery pack can be much worse than the performance of a single cell.
The purpose of lithium battery matching is to ensure that every cell in the battery has consistent capacity, voltage and internal impedance, because inconsistent performances will make lithium battery have various parameters during using. Voltage imbalance will happen. After a long run, the battery will overcharge, over discharge, capacity lost, or even fire to explode.
1.Series and Parallel Connection Mode of Lithium Battery
The length of the plug and lead of the lithium battery pack can be customized according to the customer’s electrical equipment.
3.Calculation Lithium Battery Connected in Series and Parallel
We all know that lithium battery voltage increases after series connection, capacity increases after parallel connection, then how to calculate a lithium battery quantity of series or parallel connection, and how many cells?
Before the calculation, we need to know which cell specification of the battery pack is adopted for the assembly, because different cells have different voltage and capacity. The cell quantity of series and parallel connection required to assemble a specific lithium battery pack varies. The common lithium cell types on the market are: 3.7V LiCoO2, 3.6V ternary, 3.2V LFePO4, 2.4V lithium titanate. The capacity is different because of the cell size, material and manufacturers.
Take 48V 20Ah Lithium Battery Pack for Example
Suppose the size of the single cell used is 18650 3.7V 2000mAh
Cell quantity of series connection: 48V/3.7V=12.97. That is 13 cells in series.
Cell quantity of parallel connection: 20Ah/2Ah=10. That is 10 cells in parallel.
18650-3S6P/11.1V/15600mAh Lithium Battery Assembly Process
Cell Capacity Grading
Capacity Difference≤30mAh
After capacity grading, stay still for 48-72h and then distribute.
Voltage Internal Impedance Sorting and Matching
Voltage Difference≤5mV
Internal Impedance Difference≤5mΩ 8 cells with similar voltage internal impedance are distributed together.
Cell Spot Welding
The use of formed nickel strip eliminates the problems of spurious joint, short circuit, low efficiency and uneven current distribution
Welded PCM
Make sure that the circuit board has no leakage components, and the components have no defective welding.
Battery Insulation
Paste the fibre, silicone polyester tape for insulation.
Battery Pack Aging
For the quality of the battery, improve the stability, safety and service life of the lithium battery.
PVC Shrink Film
Position the two ends after heat shrinking,
then heat shrink the middle part.
Put PVC film in the middle. No whiten after stretching. No hole.
Finished Product Performance Test
Voltage：10.8～11.7V
Internal Impedance：≤150mΩ
Charge-discharge and overcurrent performance test.
Battery Code-spurting
Code-spurting cannot be skewed, and it needs legible handwriting
Precautions for Lithium Batteries in Series and Parallel
Don’t use batteries with different brands together.
Do not use batteries with different voltages together.
Do not use different capacities or old and new lithium batteries together.
Batteries with different chemical materials cannot be used together, such as nickel metal hydride and lithium batteries.
Replace all batteries when electricity is scarce.
Use the lithium battery PCM with corresponding parameters.
Choose batteries with consistent performance. Generally, distributing of lithium battery cells is required for series and parallel connection. Matching standards: voltage difference≤10mV, impedance difference ≤5mΩ, capacity difference ≤20mA
1.Lithium Battery With Different Voltage Connected in Series
Due to the consistency issue of lithium batteries, when the same system (such as ternary or lithium iron) is used for series or parallel connection, it is also necessary to select the batteries with the same voltage, internal impedance and capacity for matching. Batteries with different voltage platforms and different internal impedance used in series will cause a certain battery to be fully charged and discharged first in each cycle. If there is a PCM and no fault occurs, the capacity of the whole battery will be reduced. If there is no PCM, the battery will be overcharged or over discharged, which will damage the battery.
2.Lithium Batteries With Different Capacities Connected in Parallel
If different capacities or old and new lithium batteries are used together, there may be leakage, zero voltage and other issues, because during the charging process, capacity differences make some batteries overcharge, some batteries not, while during discharge process, high capacity batteries do not run out of power, but low capacity batteries over discharge. In such a vicious cycle, the batteries will be damaged by leakage or low (zero) voltage.
To assemble lithium batteries, connect them in parallel or in series first?
Topological Structure of Lithium Battery Connected in Series and Parallel
The typical connection modes of a lithium battery pack are connecting first in parallel and then in series, first in series and then in parallel, and finally, mixing together.
Lithium battery pack for pure electric buses is usually connected first in parallel and then in series.
Lithium battery pack for power grid energy storage is tend to be connected first in series and then in parallel.
First Parallel and Then Series of Power Battery Module Topological Structure
First Series and Then Parallel of Power Battery Module Topological Structure
First Parallel, Then Series and Parallel Again of Power Battery Module Topological Structure
Advantages of Lithium Batteries First Connected in Parallel and Then in Series
If a lithium battery cell automatically exits, except the capacity reduction, it does not affect parallel connection;
In parallel connection, a short circuit of a lithium battery cell may cause short circuit due to large current, which is usually avoided by using fuse protection technology.
Disadvantages of Lithium Batteries First Connected in Parallel and Then in Series
If a lithium battery cell automatically exits, except the capacity reduction, it does not affect parallel connection;
In parallel connection, a short circuit of a lithium battery cell may cause short circuit due to large current, which is usually avoided by using fuse protection technology.
Advantages of Lithium Batteries First Connected in Series and Then in Parallel
First connecting the batteries in series according to the capacity, for example, 1/3 of the whole battery capacity are connected in series, and then connecting the rest in parallel, will reduce the failure probability of high-capacity lithium battery modules. First series and then parallel connection help the consistency of the lithium battery pack.
From the perspective of the reliability of the lithium battery connection, the development trend of voltage inconsistency and the influence of performance, the connection mode of first parallel and then series is better than that of first series and then parallel, and the topology structure of first series and then parallel lithium battery is conducive to the detection and management of each lithium battery cell in the system.
Lithium Batteries Charging in Series and Parallel
1.Charging Lithium Batteries In Series
At present, lithium battery tends to be charged in series, which is mainly due to its simple structure, low cost and easy realization. But as a result of different capacity, internal impedance, aging characteristics and self-discharge performance, when charge lithium battery in series, battery cell with the smallest capacity will be fully charged first, and at this point, the other battery cell is not full of electricity. If continue to charge in series, the fully charged battery cell may be overcharge.
Lithium Battery overcharge will damage the battery performance, and even lead to explosion and injuries, therefore, to prevent battery cell overcharging, lithium battery has equipped with Battery Management System (BMS). The Battery Management System has overcharge protection for every single lithium battery cell, etc. When charging in series, if the voltage of a single lithium battery cell reaches the overcharge protection voltage, the battery management system will cut off the whole series charging circuit and stop charging to prevent the single lithium battery cell from being overcharged, which will cause other lithium batteries unable to be fully charged.
2.Charging Lithium Batteries In Parallel
In parallel charging of lithium batteries, each lithium ion battery needs equalizing charge, otherwise, the performance and life of the whole lithium ion battery pack will be affected. Common charging equalization technologies include: constant shunt resistance equalizing charge, on-off shunt resistance equalizing charge, average battery voltage equalizing charge, switch capacitor equalizing charge, step-down converter equalizing charge, inductance equalizing charge, etc.
Several problems need to be paid attention to in parallel charging of lithium batteries：
Lithium batteries with and without PCM cannot be charged in parallel. Batteries without PCM can easily be damaged by overcharging.
Batteries charged in parallel usually need to remove the built-in PCM of the battery and use a unified battery PCM.
If there is no PCM in parallel charging battery, the charging voltage must be limited to 4.2V and 5V charger cannot be used.
After lithium ion batteries connecting in parallel, there will be a charging protection chip for lithium battery charging protection. Lithium battery manufacturers have fully considered the change characteristics of lithium battery in parallel before battery production. The above requirement of current design and choice of batteries are very important, so that users need to follow the instructions of parallel lithium batteries charging step by step, so as to avoid the possible damage for incorrect charge.
3.Notes for Lithium Battery Charging
Special charger must be used for lithium battery, or battery may not reach saturation state, affecting its performance.
Before charging the lithium battery, it does not need to discharge completely.
Do not keep the charger on the socket for a long time. Remove the charger as soon as the battery fully charged.
Batteries shall be taken out of electric appliances that have not been used for a long time and stored after they are fully discharged.
Do not plug the anode and cathode of the battery into the opposite direction, otherwise, the battery will swell or burst.
Nickel charger and lithium charger cannot be used together.
https://himaxelectronics.com/wp-content/uploads/2021/10/12v-batteries-in-parallel.jpg750750administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2021-10-26 02:09:032024-04-26 06:42:21Definition of Series and Parallel Connection of Lithium Batteries
