Lithium battery pack price structure
The price of a custom lithium battery pack is mainly composed of three major components: battery cell, PCM, and casing. At the same time, due to the current of the electrical appliances, the material of the connecting piece between the cells (conventional nickel sheet, formed nickel sheet, copper-nickel composite sheet, jumper sheet, etc.) or selection, different connectors (such as Special plugs, ranging from tens to thousands of dollars) may also have a greater impact on the cost. In addition, different PACK manufacturing processes will also affect the cost.
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Battery cell selection
Depending on the cathode material, custom lithium battery pack include lithium manganate (3.6V), lithium cobalt oxide (3.7V/3.8V), lithium nickel cobalt manganate (commonly known as ternary, 3.6V), and lithium iron phosphate (3.2V). , lithium titanate (2.3V/2.4V) and other battery cores of various material systems. Batteries made of different materials have different voltage platforms, safety factors, number of cycles, energy density, operating temperatures, etc.
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Requirements and design of custom lithium battery pack PCM
PCM design can be divided into: basic protection, communication, BMS
Basic protection: Basic protection includes overcharge, over-discharge, over-current and short-circuit protection. Over-temperature protection can be added according to product needs.
Communication: Communication protocols can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc. There is also a simple power display, which can be indicated by a power meter using LED.
BMS: Mainly to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the service life of the battery, and monitor the status of the battery. Its main functions include: real-time monitoring of battery physical parameters; battery status estimation; online diagnosis and early warning; charge, discharge and precharge control; equalization management and thermal management, etc. Subsystems are mostly used in electric vehicle batteries.
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Requirements and design of lithium battery pack casing
What kind of outer shell packaging form is used mainly depends on the specific needs of the customer’s product. It can be mainly divided into: PVC heat shrink film, plastic shell, metal shell
PVC heat shrink film: generally suitable for battery packs with a small number of cells in series and in parallel and a light overall weight. However, for battery packs with a relatively large overall weight, fixed brackets can be added between the cells, and fiberglass boards are added to the periphery for protection, and then PVC heat sealing is used. PVC heat shrink film is also the most economical packaging method.
Plastic case: Mainly because after different battery packs are finalized, the cases involved may need to be molded. The mold cost is a large expense. If the product is not finalized in the early stage of development, a prototype shell can be used for proofing. Different material and process requirements for the shell will also affect the cost.
Metal casel: The metal case is the same as the plastic case. Before the product is finalized or the quantity demand is not large, it is recommended to use sheet metal sample preparation, which mainly shortens the sample preparation and delivery time. If the order quantity is large, it is recommended to open a mold. There are waterproof level requirements for metal casings, which will also greatly affect the cost. Metal casings made of special materials (such as titanium alloy, etc.) will also increase the cost.
At the same time, due to different product technical difficulty, procurement volume, and defective rate requirements, lithium battery prices will vary greatly!
If you have any question, please feel free to contact us:
- Name: Dawn Zeng (Director)
- E-mail address: sales@himaxelectronics.com
