Lithium battery price structure
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.
The price of lithium batteries
I. cell selection:
First, the selection of different material system cells will affect the price of lithium batteries.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 includes over charge, over discharge, over current and short circuit protection
Communication: communication protocol can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc., and simple power display, can be used to add electricity meter using LED indicator.
BMS: BMS is the combination of the first letter of BATTERYMANAGEMENTSYSTEM, called BATTERYMANAGEMENTSYSTEM, commonly known as battery nanny or battery housekeeper, mainly for intelligent management and maintenance of each battery unit, to prevent battery over charge and over discharge, to extend the battery life, monitoring battery status.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, thermal management, etc.The secondary system is mostly used in electric vehicle 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: the specific outer shell packaging form of battery pack mainly depends on the specific needs of customers. For the packaging form of PVC heat sealing, it is generally applicable to the battery cell string with a small quantity and a light overall weight (≤2kg), which can be adopted.However, for the battery pack with the overall weight ≥1kg, it is necessary to add a fixed support between the cells, and then use PVC heat sealing after adding glass fiber board protection on the periphery.
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, the product is not finalized before or the quantity demand is not much, it is recommended to use sheet metal to make sample, so that the main is to make sample delivery period is shorter, such as large batch, also recommended to open mold.For the metal shell waterproof grade requirements, will also greatly affect the cost, there is a special material (such as titanium alloy) metal shell requirements, the cost will be higher.
The cost of lithium batteries is mainly composed of battery cells, PCM and structural parts, plus the cost of PACK, aging and management.At the same time due to the technical difficulty of the product, the purchase amount, the defective rate requirements are different, lithium battery prices will vary greatly!