Lithium battery price composition
Lithium battery mainly by the price of batteries, protective plate and shell parts, at the same time due to the power consumption of the electric appliances and electric current, the size of the material on the connection between the batteries (conventional nickel sheet, forming nickel, copper nickel composite plate, jumper, etc.) selection will affect the cost of different connectors (such as aviation plugs, from ten yuan to thousands of yuan) may also affect the cost is larger, and the different PACK process will also affect the cost.
Lithium battery price factors
I. cell selection:
First, the selection of different material system cells will affect the price of the whole lithium battery. According to the anode material of lithium-ion batteries is different, there will be a lithium manganese acid (3.6 V), cobalt acid lithium (3.7 V / 3.8 V), nickel, cobalt, manganese acid lithium (commonly known as the three yuan, 3.6 V), (3.2 V), lithium iron phosphate lithium titanate (2.3 V / 2.4 V), and other material system of batteries, the batteries of different material system, its voltage platform, safety coefficient, recycling times, energy density ratio, temperature, etc.
2 it is the price of different brands of batteries will also vary widely, 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 also is very large, and through the quality of the market evolution of each brand batteries (secure, consistency and stability) is basically is proportional to the price.
Ii. Requirements and design of lithium battery PCM
PCM design can be divided into: basic protection, communication, BMS
Basic protection: basic protection including overcharge, overdischarge, overcurrent and short circuit protection, according to the product needs to increase the overtemperature protection
Communication: communication protocols can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc., and there is a simple power display, which can be used to add electricity meter with LED indication.
BMS: BMS is the first letter of BATTERYMANAGEMENTSYSTEM for short combination, called the BATTERYMANAGEMENTSYSTEM, it is called the battery nanny or battery housekeeper, mainly for intelligent management and maintenance of each battery unit, to prevent battery charging and discharge, extend the service life of the battery, monitoring the state of the battery. Its main functions include: real-time monitoring of battery physical parameters; Battery state estimation; Online diagnosis and early warning; Charge, discharge and precharge control; Balance management and thermal management. Secondary systems are mostly used in electric car batteries.
Iii. Requirements and design of lithium battery shell
Lithium battery shell design can be divided into: PVC heat seal, plastic, metal
PVC heat sealing: what kind of outer shell packaging form is adopted outside the battery pack mainly depends on the specific requirements of the customer's products. For the packaging form of PVC heat sealing, it is generally applicable to the case of small number of battery strings and relatively light overall weight (≤2kg), it can be adopted. However, for the battery pack with the overall weight ≥1kg, it is necessary to add a fixed bracket between the electric cells, and use PVC heat sealing after the perimeter is protected by glass fiber board.
Plastic: plastic shell, mainly different battery pack after finalize the design, involving 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 material and process of shell (especially the belt is three demands), will also affect the cost.
Metal: metal shell is the same as plastic shell, before the product is not finalized or the quantity demand is not much, it is recommended to use sheet metal sample making, which is mainly to make the sample delivery time is shorter, such as large batch, it is also recommended to open the mold. For the metal shell waterproof grade requirements, will greatly affect the cost, and 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 the battery cell, PCM and structural parts, and the enterprise's PACK cost, aging cost and management cost need to be added. At the same time, due to the technical difficulties of the product, the purchase amount, the defect rate requirements are different, lithium battery prices will vary greatly!
