The price of lithium battery is mainly composed of the cell, the protection plate and the shell. At the same time, due to the power consumption and current size of the appliance, the selection of the connecting material between the cell (conventional nickel sheet, formed nickel sheet, copper-nickel composite sheet, jumper sheet, etc.) will affect the cost. Different connectors (such as aviation plug, From tens of yuan to thousands of yuan) may also have a great impact on the cost, and different PACK technology will also affect the cost.
Second, the influencing factors of lithium battery price
First, the selection of cell of different material system will affect the price of lithium battery. According to the different cathode materials, lithium manganese (3.6V), lithium cobalt (3.7V/3.8V), lithium nickel cobalt manganese (commonly known as triple,3.6V), lithium iron phosphate (3.2V), lithium titanate (2.3V/2.4V) and other materials system of lithium battery cells, the different material system of the cell, Its voltage platform, safety factor, cycle times, energy density ratio, operating temperature are not the same.
Second, the price of different brands of cell will also differ greatly, the total price gradient can be divided into: Special batteries (including temperature, super high temperature, super high rate, alien), Japanese (panasonic, sanyo, SONY), South Korea (samsung, LG), domestic (Chinese is divided into a line (lishen, bick, byd, ATL), the second line, or even can be assigned to the five lines, six lines), the material system and different brands of batteries, the price difference will be very big, And through the market survival of the fittest out of the quality of the brand cell (safety, consistency, stability) is basically proportional to the price.
2. Requirements and design of lithium battery PCM
PCM design can be divided into: basic protection, communication, BMS
Basic protection: basic protection includes over charge, over discharge, over current and short circuit protection, and over temperature protection can be added according to product requirements
Communication: communication protocols can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc., and simple electric quantity display, can be used to charge meter using LED indication.
BMS: BMS is the first letter of BATTERYMANAGEMENTSYSTEM, called BATTERYMANAGEMENTSYSTEM, commonly known as battery nanny or battery manager, mainly for intelligent management and maintenance of each battery unit, to prevent overcharging and overdischarging of the battery, prolong the service life of the battery, monitoring the status of the battery. Its main functions include: real-time monitoring of battery physical parameters; Battery state estimation; On-line diagnosis and early warning; Charge, discharge and precharge control; Balance management and hot management. The secondary system is mostly used in electric vehicle batteries.
3. Requirements and design of lithium battery shell
Lithium battery shell design can be divided into: PVC heat sealing, plastic, metal
PVC heat seal: what kind of shell packaging form is used outside the battery pack, mainly depends on the specific needs of the customers. For the packaging form of PVC heat seal, it is generally applicable to the battery string and the number is not much, and the overall weight is light (≤2kg), it can be used. However, for the overall weight of the battery pack ≥1kg, it is necessary to add a fixed bracket between the cell, add glass fiber board protection on the periphery, and then use PVC heat sealing.
Plastic plastic shell, mainly different battery pack after finalize the design, involves shell may need to open mold, mold fee is a lot of money, such as the early stage of the development, the product did not finalize the design, can use hand shell proofing (hand strength after mould shape is better than material strength), the shell material and process (especially the belt is three demands), It also affects the cost.
Metal: the metal shell is the same as the plastic shell. Before the product is finalized or the quantity is not required, it is recommended to use sheet metal sample preparation, which is mainly due to the short sample preparation delivery time. If the batch is large, it is also recommended to open the mold. For metal shell waterproof grade requirements, will greatly affect the cost, there is a special material (such as titanium alloy, etc.) metal shell requirements, the cost will be higher.
The cost of lithium battery is mainly composed of cell, PCM and structural parts, plus PACK cost, aging cost and management cost of the enterprise. At the same time because of the technical difficulty of the product, the purchase amount, the requirements of the defective rate are different, the price of lithium battery will be very different!
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