Drones are being used more and more widely in all our lives, so the batteries that power these devices are increasingly advancing and being pushed to their limits. One of the biggest challenges to these batteries is endurance; more and more users need the power to last longer.
One such example is with an agricultural drone. Let’s say that the drone carries 10kg of pesticide with two ordinary Lithium Polymer (LiPo) batteries that have a capacity of 16000mAh in 6S (22.2V). This drone will only be able to last about ten minutes with these batteries, which farmers generally find to be too short. However, the use of high-voltage batteries with the same capacity and C rating can increase this flight time by 15-25%, which will increase the efficiency and operations.
We will explore why high-voltage batteries can improve flight duration and also look at the advantages of such batteries.
1. Weight
Without an increase in weight, high-voltage batteries provide better performance. This is key for UAVs since each drone has a specific payload that it cannot go over.
2. Higher Voltage
If we compare ordinary LiPo batteries to that of those with high voltage, we see a subtle change in voltage. Through this little voltage increase, users are able to get increased performance in their products.
Ordinary LiPo Batteries
The nominal voltage for a single LiPo cell is 3.7V. A 6S battery pack has a nominal voltage of 22.2V, and a 12S has 44.4V.
A single LiPo cell that is fully charged has 4.2V while a 6S has 25.2V and a 12S 50.4V.
High-Voltage LiPo Batteries
The nominal voltage of a single high-voltage LiPo cell is 3.8V, a 6S pack has 22.8V, and a 12S has 45.6V.
A single LiPo cell that is fully charged has 4.35V while a 6S has 26.1V and a 12S 52.2V.
3. Better Cycle Life
In the chart above, we can follow the discharge rate of several batteries. The high-voltage 4.4V batteries (shown in green) demonstrate a higher discharge rate and discharge capacity.
The above chart shows that, under the same discharge currents and cycles, the 4.4V (in blue) has a longer cycle life than the other batteries at 4.35V or 4.2V.
4. Increased Efficiency
Similar to the example offered at the beginning, we put two drones together for a simple test. Both drones carried 15kg of water with two batteries of 25C and 22000mAh in 6S.
The drone with the non-high-voltage batteries (22.2V) lasted 17 minutes and 50 seconds.
The drone with the high-voltage batteries (22.8V) lasted longer for 22 minutes and 10 seconds, lasting 4 minutes longer than the ordinary batteries.
Conclusion
According to the above data, the advantages of high-voltage UAV batteries are obvious.
We are able to custom, high-voltage cells and offer a one-stop service for your battery designs and solutions.
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Lithium-ion batteries are required for smartphones, laptops, and electric cars. Although lithium-ion batteries have many advantages, they still have a fire hazard when they overheat. According to foreign media reports, The Johns Hopkins University is developing a new type of lithium-ion battery that will not catch fire and has made breakthroughs.
The researchers said that the new lithium-ion battery is very thin and flexible, unlike the current lithium-ion battery. Today’s lithium-ion batteries must be encapsulated in a rigid cylindrical or polygonal battery cover to isolate unstable and explosive components. The battery developed by Johns Hopkins University is very strong, can be immersed in water, cut, and even withstand ballistic impact.
ONE TOUGH POWER SOURCE
The popular myth that a spider is never more than a few feet away is arguably more true of lithium-ion batteries than of arachnids. Powering everything from smartphones and laptops to electronic cigarettes, lithium-ion batteries beat out alternative sources of power because of their top-notch energy density and long life cycle, meaning they can be recharged over and over again before breaking down. Yet for all these advantages, lithium-ion batteries come with a major concern: They can catastrophically ignite when they overheat.
At the Johns Hopkins Applied Physics Laboratory, a new type of lithium-ion battery that cannot catch fire is in the works. A team of researchers led by Konstantinos Gerasopoulos, a senior research scientist at the lab, recently made breakthroughs in their development efforts. The new battery is thin and flexible, unlike today’s lithium-ion batteries that must be packaged in rigid cylindrical or polygonal cases to wall off their volatile contents. The APL battery is also tough, able to withstand submersion in water, cutting, and even ballistic impacts.
“We wanted to create a battery that is as thin and powerful as the electronics it’s intended to power,” Gerasopoulos says. “And to do that, we needed to transform the battery’s safety.”
Swap out for safety
In batteries, a liquid electrolyte conveys electrons between two electrodes, providing an electric current that powers your device. Standard lithium-ion batteries contain an electrolyte with an organic solvent that, while efficient, happens to be flammable. Gerasopoulos and colleagues have developed a new class of electrolyte that uses lithium salts dissolved in water as an inflammable solvent. A polymer matrix—basically, a kind of plastic sponge—soaks up the water, and the ultimate result is a bendable, soft, contact lens–like electrolyte.
The positive with the negative
Usually, lithium-ion battery electrodes are foil-like and, when bent too much, can crinkle and be damaged. APL’s battery electrodes are instead crafted with Kapton, a flexible film often used to insulate a spacecraft from extreme temperatures. As an added bonus, Kapton is a readily available, off-the-shelf material, reducing the battery’s cost and complexity to manufacture.
More power for longer
The current iteration of the new electrolyte sustains 4.1 volts—not quite as much as conventional lithium-ion batteries, but it’s inching closer. The APL team also wants to improve the battery’s life cycle from around a hundred charges to more like a thousand, matching today’s typical battery performances. Continued tweaking of the polymer’s chemistry for better electrochemical stability should deliver on these two objectives.
The article is forwarded from Johns Hopkins Magazine by Adam Hadhazy
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In this blog post, rather than do my own testing – I will rely on the specification sheets provided by Panasonic, Samsung, and LG. We’ll look at the storing section of these spec sheets, and break down the important factors and what they mean. Scroll to the end, the overview, to get to the conclusions of the post quickly.
What does it mean?
There are three rows, each with different storage conditions. Note the second and third column are locked in place by the fourth. Each row represents recovering 80% of the battery’s usable capacity. Since the rated capacity of the NCR18650B is 3200 mAh, this 80% represents 2560 mAh after storage.
If you are storing an 18650 battery for less than a month, you may store it in an environment as hot as 50°Cand be able to recover 2560 mAh.
If you are storing an 18650 battery for less than 3 months, you may store it in an environment as hot as 40°Cand be able to recover 2560 mAh.
If you are storing an 18650 battery for less than 1 year, you may store it in an environment as hot as 20°Cand be able to recover 2560 mAh.
In the last case, storing for one year with a 20% drop in capacity translates to 1.6% loss of capacity per month, or 53 mAh.
In the first case (storing at high temperatures for less than one month) translates to a loss of 21 mAh per day.
Storage temperature and conditions
We can see from the above 3 items, it is temperature as the main factor determining the resulting capacity after storage, and ultimately how long you can store your battery for.
18650 batteries can be stored at very low temperatures, but high temperatures degrade them quickly. Rule of thumb: They must always be stored at less than 60°C.
Lithium-ion batteries, in most cases must maintain a voltage above 2.5V before they start to break down and decompose. Therefore, for long-term storage it is best to “top-up” your batteries when their voltage drops too low.
Note 1:When receiving new cells, the manufacture will ship them at a 40% charge. However, it is very likely this will soon be set at 30% as airline safety regulations demand safer transport, and less charge is safer.
Note 2:In these tests, Panasonic fully charged the batteries at 25°C, up to 4.2V. However, for long-term storage it is recommended not to store at a full charge, but to seek a lower voltage (more on that ahead).
Finally, the environment should be dry, or low humidity – without dust, or a corrosive gas atmosphere. Optimizing your cell’s environment becomes more important the longer they are kept stored. Anything above 3 months may start to be considered long-term.
Differences between the Samsung 25R and Panasonic 18650B
The Samsung 25R performs better during storage on all fronts. Across the board, the 25R can store at ten degrees lower than the 18650B. As well, the difference in higher temperatures, in favor of the 25R from 1 month, 3 months, to 1.5 years, is +10°C, +5°C, +5°C.
Most importantly, this 18650 battery can be stored a full six months longer and retain 90% capacity (10% more than the NCR18650B).
The optimal storing voltage
The 25R spec sheet notes that for long-term storage, the voltage should, rather than be fully charged, set at a lower, more optimal voltage. This is to prevent the degrading of performance characteristics. In the case of the 25R, the recommended voltage is 50 ± 5% of its standard (4.2V) charged state.
This works out to be a range between 3.64V and 3.71V
Other batteries have different ranges, but most are close to ~50% voltage which is usually around ~3.7V.
Overview
It is good to reference at least three batteries, and off the blog I have checked more. All 18650 batteries researched need a storage range of between -20 ~ +50°C (-4°F ~ + 122°F) or they will degrade, so this is a good rule of thumb to use.
Also keep in mind the maximum temperature for storage should never exceed +60°C (140°F). It is better to store in a cold environment, than a hot one.
Optimally, a good storage temperature should be closer to 25°C (77°F) or a somewhat lower. The closer you are to an optimal temperature, the longer you will be able to store your batteries without “topping up” and recharging them.
For the most part, the maximum time for 18650 storage before recharge is about one year.
If you are intending long term 18650 storage, a storage charge closer to 50% of usable capacity (~3.7V) rather than 100% (4.2V) will prevent faster battery degradation.
Frequently asked questions and notes
What happens if I don’t store my 18650 batteries correctly?
It will cause a loss of performance and your cells may leak and/or rust, and ultimately become unusable. Cells becoming unstable enough and exploding in storage is a possibility. In the worst case – explosion – it is not clear why this sometimes happens but it could be due to static, pressure, temperature, or packing incorrectly (allowing metal objects or batteries to touch).
Notes
For very short-term storage, don’t store the battery in a pocket or a bag together with metallic objects such as keys, necklaces, hairpins, coins, or screws when you are travelling.
Remove the battery from its application before storing it. For example, from your e-cigarette, flashlight, or electric bike. You should optimally store the batteries in a fire-proof container, with optimal environmental conditions.
Do not store 18650 batteries in or near objects that will produce a static electric charge.
Quick pressure changes can also cause 18650 batteries to malfunction
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Lithium is thought to be one of the first elements made after the Big Bang. An enormous amount of Hydrogen, Helium, and Lithium (the first three elements on the periodic table) were synthesized within the first thee minutes of the universe’s existence.
This process is called Big Bang nucleosynthesis. Essentially, all elements heavier than lithium were made much later by stellar nucleosynthesis (like what is happening in the Sun).
Lithium is special for other reasons too
Lithium facts on history
Lithium is from Greek lithos meaning “stone”
Was used in the first man-made nuclear reaction in 1932
Lithium interesting facts
Soft enough to be cut by scissors
The lightest metal, and least dense solid element, so it can easily float on water
Does not occur freely in nature (it’s too unstable), but is found in nearly all lava, mineral water, and sea water
Pure lithium corrodes immediately when exposed to the moisture in air
Lithium in biology
All organisms have a little lithium in their bodies, but it does not seem to serve a biological purpose
Lithium in pills is used to treat bipolar disorder
Lithium in economics
80% of the world’s lithium is in salt flats between Argentina, Chile, and Bolivia
Let’s look at some pictures
Here are some pieces of raw lithium. Notice the lines and grooves cut into the soft metal by the tool they used to cut it. Also note what appears to be a bubble. It is most likely Hydrogen, as this is what is released when lithium reacts to water (or water from moisture in the air).
This is a photograph taken in Bolivia, in what is called ‘Salar de Uyuni’ – the biggest salt lake in the world. The amazing scenery holds a secret – a huge reserve of lithium. With the right investment, Bolivia may become what Kuwait was for oil to the new rechargeable revolution.
A fully developed lithium mine in the Atacama Desert. This is where the material in your 18650 battery most likely comes from.
This is a depiction of Asteroid 2012 DA14 which nearly missed Earth a few years ago. It was once famously valued at $195 billion US dollars for the large amount of metals like iron ore, copper, and lithium trapped inside. Maybe one day we won’t have to dig up our backyard to get the resources we need to enjoy ourselves.
So remember, next time you turn on your vaporizer, or other machine that uses li-ion batteries, to think a little about where it came from and what it means for our future.
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The material and chemistry used in the cathode of a battery are vital in determining the battery performance. Currently, the positive electrode materials successfully developed and applied include lithium cobalt oxide (LCO), lithium iron phosphate (LFP), lithium manganate (LiMn2O4), ternary material nickel cobalt manganate (NCM), and nickel cobalt aluminum aluminate (NCA). We will explore a few common chemistries for cathode material in this article.
Lithium cobalt oxide (LCO, LiCoO)
Lithium cobalt oxide, also known as lithium cobaltate, are particularly special because they were the first commercially produced lithium batteries. Lithium cobaltate has many benefits with its high discharge platform, simple synthesis process, high capacity, and good cycle performance. However, cobalt can be relatively toxic, and the price high. It is also difficult to guarantee safety when making large LCO batteries.
Most 3C electronic batteries still use LCO rather than a higher-capacity ternary material because lithium cobalt oxide material has greater density per volume. Lithium cobalt oxide is predominantly used in cell phones and laptops.
Furthermore, the theoretical capacity of lithium cobalt oxide is high, but the actual capacity is only half of what is theorized. The reason is due to the charging process: when the amount of lithium ions extracted from lithium cobalt oxide material is less than 50%, the morphology and crystal form of the material can be kept stable. However, when the lithium-ion extraction amount increases to 50%, the lithium cobaltate material undergoes a phase change. If charging continues at this time, cobalt will dissolve in the electrolyte and generate oxygen, which affects the stability of the battery cycle life and performance.
Lithium iron phosphate (LFP, LiFePO4)
There is wide interest in Lithium iron phosphate cathode materials.
Its main features include non harmful elements, low cost, and good safety and cycle life (its lifespan can reach 10,000 cycles). These characteristics have made lithium iron phosphate materials popular for research, and they are widely used in the field of electric vehicles.
The main disadvantage of lithium iron phosphate is its low energy density. The voltage of lithium iron phosphate material is only about 3.3V, which makes the LFP battery have lower energy storage. Lithium iron phosphate also has poor conductivity and needs to be nanometer-sized. It can be coated to obtain good electrochemical performance, which makes the material become “fluffy” and the compaction density low. The combined effect of the two makes the energy density of lithium iron phosphate batteries lower than that of lithium cobalt oxide and ternary batteries.
Recently, accidents concerning new energy vehicles have occurred and frequently show up on the news. People hope to improve upon the materials and its safety performance by modifying it: some researchers have mixed lithium iron phosphate with manganese to make it have higher voltage and energy density while others have mixed it with NCM ternary material.
Ternary materials (NCM, NCA)
Ternary material is the common name of lithium nickel cobalt manganese oxide (LiNixCoyMn1-x-y02), which is very similar to lithium cobaltate. This material can be balanced and adjusted in its specific energy, cycle, safety, and cost.
The different configurations of nickel, cobalt, and manganese bring about various properties to the material: increasing the nickel content increases the capacity of the material but makes the cycle performance worse; the presence of cobalt makes the material structure more stable but the content too high and capacity reduced; the presence of manganese reduces costs and improves its safety performance, but its high content destroys the layered structure of the material.
Due to the many factors that need to be considered when using these elements, the focus of ternary material research and development has been on finding the proportional relationship between nickel, cobalt, and manganese in order to achieve optimal performance.
If you are interested in the Himax’s high discharge and custom-made batteries, please reach out to us at sales@himaxelectronics.com. We can be the one-stop solution to your products’ needs.
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Whether you are planning to buy a RC drone as a gift to gift someone or want to buy one to fly in your leisure time, some mini RC drones with hidden camera options that can be used as a spy video camera, others with LED blades that can be flown at night. With so many designs and features to choose, following are some useful tips for buying some of the best RC drones available from the market:
Ready- Made vs Build-Your-Own
For teens, RC drones can be a wonderful hobby. It allows them to go outside and develop technical skills to operate various types of gadgets and vehicles. For adults, flying these drones can be a great way to relieve stress from work and studies. Comparing to other RC gadgets and vehicles RC drones can be quite complicated to operate.Therefore, you need to practice a lot before flying them outdoors. On the other hand, before buying an RC drone, you need to choose between ready-made or build-your-own option.
Ready-made RC drones are perfect for those who wish to fly one without considering technical and mechanical sides. Ready-made RC drones are usually preferred by newbie’s as it is easier to operate than build-your-own drone.
Those people who prefer an RC drone kit and build it from scratch are usually those who are interested in exploring everything about their RC drones. If you build one by yourself, you can even customize it and improve its performance. However, bear in mind that it requires a lot of time, patience and efforts.
Gas and Electric Powered RC Drones
Generally speaking, RC drones that run on gas are more rare and expensive than electric ones. They are also more complicated to operate and fly.
Electric ones are less expensive than gas powered RC drones and can be easily operated outdoors. Although their battery packs can be quite expensive, however, they are easier to maintain and operate.
Indoor and Outdoor Drones
Indoor RC drones are perfect for newbie’s and amateur players as they are not as powerful as outdoor RC drones. Moreover, they can only go up to a certain level as they are meant to be used indoors.
Also, you need to make sure that no obviously objects or pets getting into your road when flying RC drones indoor.
Outdoor RC drones are more expensive and powerful than indoor drones and can be easily operated from a wide distance.
Outdoor drones are not recommended for new players as they can harm travelers or vehicles if they get crashed from a high height.
Mini vs Large Drones
RC drones come in a variety of shapes and sizes. Smaller RC drones do not cause any severe damage in case of an accident. They are quite versatile and can be flown indoors and outdoors as well. They’re perfect for new players and do not require much time to set up.
However, they are not as sturdy as bigger RC models.
Larger drones are more suitable for professional players. They closely resemble real helicopters and can be easily flown in windy places.
Bigger models can be quite expensive and you need to follow certain rules while flying such drones outdoors.
LED Blades for RC Drones
RC drones are equally fun when flown at night. You can use special blades that consists of bright neon and LED lights for a better night vision. You can even customize your blades yourself with LED strips. Whether you are flying your drone during the day or night time, try to avoid flying them in public places.
Currently on the market common drone batteries are mainly divided into three kinds.
1. lithium polymer batteries, with high energy density, lightweight features, most stores sell drones mostly powered by lithium polymer batteries.
2. lithium batteries: higher price, but large capacity, lightweight, high stability, and longer service life than lead-acid and nickel-metal hydride batteries. 3. nickel-metal hydride (Ni-MH) batteries: the battery can be used to power drones.
3. nickel-metal hydride (Ni-MH) batteries: moderately priced, but heavier, with longer safety and service life, suitable for large drones that require long flight times.
Li-ion batteries are the most common type of UAV batteries nowadays, which have the advantages of high energy density, large capacity, light weight and easy charging. Polymer batteries are one of the thinnest and lightest drone batteries, capable of meeting the energy needs of small drones, but relatively susceptible to temperature effects. From a comprehensive point of view, Li-ion batteries have become the most popular type of drone batteries on the market.
Common Drone Battery Voltages and Capacities
Drone batteries come in a variety of voltages, with 3.7V, 7.4V, 11V, 14.8V, and so on being commonly used. The higher the voltage, the more power and speed the drone can provide, but at the same time the battery will be heavier and larger.
Generally speaking, small drones use 3.7V or 7.4V batteries, while larger drones require higher voltage batteries to provide sufficient power and speed. But at the same time, the battery voltage also needs to be matched with the motors used in the drone to ensure the efficiency and life of the motors.
Batteries used in drones generally have a capacity of 500mAh to 10,000mAh. The higher the capacity, the longer the battery will last, but it will also be heavier and bulkier.
For small drones, a battery with a capacity of 500mAh to 1000mAh is the most common choice, while larger drones require a higher capacity battery to provide sufficient battery life. Battery capacity also needs to be considered in relation to the weight, flight speed and altitude of the drone.
Maintenance and Repair
The maintenance of an RC drone includes changing the motor and preventing it from overheating. For beginners, it is recommended to seek for some professional help in case a drone is damaged or is not properly working.
A battery with lower C rate can negatively affect the speed and overall performance of your drone. In order to maximize the life cycles of your drone’s battery, please wait for at least half an hour to recharge your drained battery. Also, avoid overcharging it.
You can also join an online website or group to get valuable insights and information regarding RC drones. You can follow various threads and blogs to get updates and reviews for the latest RC drone kits.
Keep an eye out on Himax’s official blog, where we regularly update industry-related articles to keep you up-to-date on the battery industry and related peripheral market.
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It has a lot of benefits to solar street lights with lithium batteries. So more and more countries and areas are planning to use solar street lights with a lithium battery.
A small solar panel, after absorbing one-day solar energy, produces enough electricity for a 30 Watt LED solar street light to last 2–3 days. Compared with traditional street lamps, solar street lights with lithium batteries can save a lot of electric energy and can reduce the consumption of electric energy when no one passes, without human control. Some years ago, solar street lights use lead-acid battery or gel battery, these batteries are heavy, the DOD is 70%, low efficiency, and easy to steal by theft. Solar street lights with lithium battery, the lithium battery is light and DOD is 100%, more efficient, and can install on the top of the pole or fix inside the lamp, it has an anti-theft function.
The reduction of advanced control technology and energy consumption, coupled with the development of solar street lights technology and lithium battery technology, has gradually replaced solar street lights with lithium batteries with traditional street lights.
A 250W traditional street lamp lights up for 10 hours a day, and need consumes about 100 KWh a year. Installing 30 Watt LED solar street light can achieve the same light efficiency, so installing solar street lights with lithium battery can save at least 80% of the electricity bill. Solar street light Philippines are widely used. The lighting conditions in this area are good, there are many islands, many places are too far away to be connected to the mains, and most of them are tourist areas. The installation of solar street lights will also help the tourism activities of these places. So the benefits of solar street lights with a lithium battery will include high efficiency, long use life, save a lot of power and anti-theft.
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▪ Prime Minister Narendra Modi’s administration unveiled a slew of measures in 2019 to promote the clean-energy vehicles
▪ Several plans are under way to build lithium-ion battery factories in India
Topics
Electric vehicles
MUMBAI : India’s ambition of becoming a global hub for making electric vehicles faces one major hurdle: its lack of access to lithium.
Home to some of the most polluted cities on the planet, the South Asian nation is pivoting toward new-energy vehicles to clean up its toxic air. But with meager resources of lithium, the mineral essential to make batteries for electric vehicles, it is having to scour for resources overseas.
India’s EV production will rely on imports from China of lithium chemicals used to make cathodes and battery cells, according to Jasmeet Singh Kalsi, director at Manikaran Power Ltd., which is exploring setting up India’s first lithium refinery. “China has a thriving lithium chemical, battery cathode, battery cell and EV supply chain. India has none.”
Prime Minister Narendra Modi’s administration unveiled a slew of measures in 2019 to promote the clean-energy vehicles, including a $1.4 billion plan to make India a manufacturing hub for EVs and cutting taxes to spur purchases. While electric cars in India remain a small segment, with an estimated 3,000 sold in 2018 compared with the 3.4 million fossil fuel-powered cars in the same year, the nation is forecast become the fourth-largest market for EVs by 2040, when the segment will comprise nearly a third of all vehicles sales, according to BloombergNEF.
Import Reliance
Several plans are under way to build lithium-ion battery factories in India. Meanwhile, China — the largest electric vehicle market in the world — is dominant in the battery supply chain. Around three-quarters of battery cell manufacturing capacity is in China, and Chinese companies have unparalleled control of required domestic and foreign battery raw materials and processing facilities, according to BNEF.
“Indian companies have been involved in trying to prospect for stakes in overseas resources, and possibly on-shoring more raw materials production capacity in India,” said Sophie Lu, head of metals and mining for BloombergNEF. “But there are very little synergies right now because further up the value chain, battery components manufacturing capacity does not seem to be planned extensively for India.”
A joint venture called Khanij Bidesh India Ltd. has been formed between three state-run companies — National Aluminium Co., Hindustan Copper Ltd. and Mineral Exploration Corp. — to acquire lithium and cobalt mines overseas. Amara Raja Batteries Ltd., the country’s second-biggest traditional battery maker by value, will build a lithium-ion assembly plant, while Suzuki Motor Corp. along with Toshiba Corp. and Denso Corp. is setting up a lithium-ion battery manufacturing plant.
Manikaran signed an agreement with Australia’s Neometals in June to jointly fund the evaluation of developing a lithium refinery in India with a capacity of 10,000 tons to 15,000 tons of the finished product. That capacity falls short of India’s projected requirement of 200,000 tons of lithium hydroxide by 2030, Kalsi said.
Electric vehicles are “slowly going to take off, not with the speed the government perceives it to be, but going ahead the market is going to get pretty huge,” he said.
This story has been published from a wire agency feed without modifications to the text. Only the headline has been changed.
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Battery pole piece spot welding machine work principle:
Battery pole piece spot welder use of ultrasonic metal welding principle, ultrasonic metal welding should be classified as don’t need preheating welding. Oxidation surface is the great friction welding which division, and at the same time two parts are pressed together. This program let two materials to produce the atom so close to the action. Far below melting point relatively slight increase of temperature in the welding process is not important factors. At the same time, because the basic material not liquefied, so there is no microstructure changes, also will not damage to internal structure. Ultrasonic cell metal special welding machine is suitable for: aluminum + nickel, nickel and copper foil, aluminum + aluminum foil, multilayer copper foil, multi-layer aluminum foil, multilayer copper nets, multilayer aluminum mesh, aluminum plate + aluminum strip, aluminum nickel composite belt + aluminium plate, aluminum shell bottom + ni-clad-al strip double point welding; And with nickel and copper foil, nickel band and aluminum belt, aluminium strip and aluminum foil, aluminum band and aluminum cover, aluminum shell and ni-clad-al strip of the material such as the single point, multipoint, single, multi-layer, square, form and process of welding. Features suitable for battery, hardware, electrical appliances and motor industry.
Battery pole piece spot welder features:
due to the bench ultrasonic cell metal welding machine machine 80% use import parts and components, to ensure low failure rate and machine section structure design is reasonable;
ultrasonic lithium ion battery metal welding machine of welding mould can according to different application fast and convenient to change;
ultrasonic cell copper foil nickel sheet welding machine with German import piezoelectric ceramic transducer, stable and durable;
miniature ultrasonic power battery cover sheet welding machine operation easy, built-in electronic protection circuit, the use of safe,
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https://himaxelectronics.com/wp-content/uploads/2020/03/01.jpg400800administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2020-03-30 07:15:422024-04-26 07:08:43Battery pole piece spot welding
Elon Musk promised Tesla would soon have a million-mile battery, more than double what drivers can expect today. A new paper suggests he wasn’t exaggerating.
LAST APRIL, ELON Musk promised that Tesla would soon be able to power its electric cars for more than 1 million miles over the course of their lifespan. At the time, the claim seemed a bit much. That’s more than double the mileage Tesla owners can expect to get out of their car’s current battery packs, which are already well beyond the operational range of most other EV batteries. It just didn’t seem real—except now it appears that it is.
Earlier this month, a group of battery researchers at Dalhousie University, which has an exclusive agreement with Tesla, published a paper in The Journal of the Electrochemical Society describing a lithium-ion battery that “should be able to power an electric vehicle for over 1 million miles” while losing less than 10 percent of its energy capacity during its lifetime.
Led by physicist Jeff Dahn, one of the world’s foremost lithium-ion researchers, the Dalhousie group showed that its battery significantly outperforms any similar lithium-ion battery previously reported. They noted their battery could be especially useful for self-driving robotaxis and long-haul electric trucks, two products Tesla is developing.
What’s interesting, though, is that the authors don’t herald the results as a breakthrough. Rather, they present it as a benchmark for other battery researchers. And they don’t skimp on the specifics.
“Full details of these cells including electrode compositions, electrode loadings, electrolyte compositions, additives used, etc. have been provided,” Dahn and his colleagues wrote in the paper. “This has been done so that others can recreate these cells and use them as benchmarks for their own R+D efforts.”
Within the EV industry, battery chemistries are a closely guarded secret. So why would Dahn’s research group, which signed its exclusive partnership with Tesla in 2016, give away the recipe for such a seemingly singular battery? According to a former member of Dahn’s team, the likely answer is that Tesla already has at least one proprietary battery chemistry that outperforms what’s described in the benchmark paper. Indeed, shortly after the paper came out, Tesla received a patent for a lithium-ion battery that is remarkably similar to the one described in the paper. Dahn, who declined to comment for this article, is listed as one of its inventors.
The lithium-ion batteries described in the paper use lithium nickel manganese cobalt oxide, or NMC, for the battery’s positive electrode (cathode) and artificial graphite for its negative electrode (anode). The electrolyte, which ferries lithium ions between the electrode terminals, consists of a lithium salt blended with other compounds.
NMC/graphite chemistries have long been known to increase the energy density and lifespan of lithium-ion batteries. (Almost all electric cars, including the Nissan Leaf and Chevy Bolt, use NMC chemistries in their batteries, but notably not Tesla.) The blend of electrolyte and additives is what ends up being the subject of trade secrets. But even those materials, as described in the paper, were well known in the industry. In other words, says Matt Lacey, a lithium-ion battery expert at the Scania Group who was not involved in the research, “there is nothing in the secret sauce that was secret!”
Instead, Dahn’s team achieved its huge performance boosts through lots and lots of optimizing of those familiar ingredients, and by tweaking the nanostructure of the battery’s cathode. Instead of using many smaller NMC crystals as the cathode, this battery relies on larger crystals. Lin Ma, a former PhD student in Dahn’s lab who was instrumental in developing the cathode design, says this “single-crystal” nanostructure is less likely to develop cracks when a battery is charging. Cracks in the cathode material cause a decrease in the lifetime and performance of the battery.
https://himaxelectronics.com/wp-content/uploads/2020/03/Transpo-Tesla_himax.jpg400800administrator/wp-content/uploads/2019/05/Himax-home-page-design-logo-z.pngadministrator2020-03-24 06:59:372024-04-29 01:34:27Tesla May Soon Have a Battery That Can Last a Million Miles
