Views: 0 Author: Site Editor Publish Time: 2022-11-20 Origin: Site
First, the price of lithium battery composition
The price of lithium battery is mainly composed of three major components: the core, protection plate and shell, and the size of the power consumption and current of the appliance, the material selection of the connection piece between the cores (conventional nickel sheet, formed nickel sheet, copper-nickel composite sheet, jumper, etc.) will affect the cost, different connectors (such as special plugs, from a dozen to thousands of dollars) may also have a greater impact on the cost, and there are different The PACK process will also affect the cost.
Second, the impact of lithium battery price factors
1, the selection of the battery cell
First, the selection of different material system cores will affect the overall lithium battery price. Lithium battery according to the different anode materials, there will be lithium manganate (3.6V), lithium cobaltate (3.7V/3.8V), lithium nickel cobalt manganate (commonly known as ternary, 3.6V), lithium iron phosphate (3.2V), lithium titanate (2.3V/2.4V) and other materials system of the cell, its different material system of the cell, its voltage platform, safety factor, the number of cycles, energy density ratio, the Working temperature, etc. are different.
Second, the price of different brands of battery cells can vary greatly, the total price gradient can be divided into: special battery cells (including ultra-low temperature, ultra-high temperature, ultra-high rate, shaped), Japanese (Panasonic, Sanyo, Sony), Korean (Samsung, LG), domestic (domestic and divided into a line (Lixin, Bik, BYD, ATL), second line, and even to five lines, six lines), the same material system and different brands of The same material system and different brands of battery cells, the price difference will be very large, and the quality of each brand of battery cells (safety, consistency, stability) through the market winners and losers is basically proportional to the price.
2, lithium battery PCM needs and design
PCM design can be divided into: basic protection, communication, BMS
Basic protection: basic protection includes overcharge, overdischarge, overcurrent and short-circuit protection, over-temperature protection can be added according to product demand
Communication: Communication protocols can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc. There is also a simple power display, which can be used to add power meter using LED indication.
BMS: BMS is the first letter of BATTERYMANAGEMENTSYSTEM abbreviation combination, called the battery management system, commonly known as battery nanny or battery housekeeper, mainly for the intelligent management and maintenance of each battery unit, to prevent the battery from overcharging and overdischarging, prolonging the life of the battery, monitoring the state of the battery. Its main functions include: real-time monitoring of battery physical parameters; battery status estimation; online diagnosis and early warning; charging, discharging and pre-charging control; equalization management and thermal management, etc. The subsystem is mostly applied to electric vehicle batteries.
3, the demand and design of lithium battery shell
Lithium battery shell design can be divided into: PVC heat sealing, plastic, metal
PVC heat seal: the specific external battery pack shell packaging form, mainly depends on the specific needs of the guests' products, for the use of PVC heat seal packaging form, generally applicable to the number of cells in series and not much, the overall weight is light (≤ 2kg), can be used. But for the overall weight ≥ 1kg battery pack, it is necessary to add fixed brackets between the cells, and then use PVC heat sealing after adding glass fiber board protection at the periphery.
Plastic: the use of plastic shell, mainly different battery packs after shaping, involving the shell may need to open the mold, mold costs are a considerable expense, such as the development of pre-production, the product is not shaped, you can use the hand shell prototype (hand strength is not as strong as the material strength after shaping the mold), the shell of the material and process (especially with three anti) requirements are different, will also affect the cost.
Metal: metal shell is also the same as the plastic shell, the product is not finalized before or the number of demand is not much, it is recommended that the use of sheet metal prototype, so that the main sample making shorter delivery time, such as batch is larger, it is also recommended to open the mold. For the metal shell has a waterproof level requirements, will also greatly affect the cost, there is a special material (such as titanium, etc.) metal shell requirements, the cost will be higher.
The cost of lithium batteries is mainly composed of cells, PCM, structural components, another need to add the PACK costs, aging costs, management costs, etc. of enterprises. At the same time, due to the technical difficulty of the product, the amount of procurement, defective rate requirements are different, the price of lithium batteries will also vary greatly