Cells are the key to power batteries, and they are the smaller units that make up a vehicle's power batteries. Compared to soft packs and square batteries, cylindrical cells have the characteristics of higher standardization and better cooling space. However, only a large number of cells are combined in Together, plus the protective circuit and protective case, can be used directly. This is called a battery module.
A single cell needs to be strictly screened by a professional cell sorting machine. This cell sorting machine is commonly used for cylindrical batteries (18650 26650 21700) to replace different cells, and only needs to replace the test module, saving costs. It is highly versatile. Firstly, the battery cells with good consistency are assembled into a modular battery module according to a precise design, and a single battery monitoring and management device is installed. After passing through professional battery spot welding equipment , the battery module is formed by welding with a solder pin and a nickel sheet, and then it will enter the battery pack process. First assemble the required connectors to the lower box, install the cooling system, install the corresponding modules into the housing, connect the high and low voltage wiring harnesses, and fasten the upper cover; then perform the leak test of the cooling system and the box; pass The final test of the battery pack is then carried out. After passing the test, it is stored in the warehouse to form the final finished power battery.
In the lithium power battery industry chain, its upstream is mainly composed of various raw materials including lithium ore, cobalt ore, etc. The midstream includes cathode materials, anode materials, electrolytes, separators, battery cell manufacturing and Pack packaging, and downstream is new energy car. Among them, the positive electrode material directly determines the performance of the power battery.
According to the cathode material, power batteries are generally divided into lithium iron phosphate batteries and ternary lithium batteries. Lithium iron phosphate batteries have low energy density but relatively high safety levels, and are generally used in commercial passenger cars. Ternary material power batteries have higher energy density and are generally used in passenger cars. In recent years, the requirements of subsidy policies for energy density have continued to increase, and the market share of ternary materials and power batteries has continued to expand. From January to September 2018, the cumulative sales of ternary batteries reached 24.6GWh, accounting for more than 50% of total sales, reaching 53.9%.
Batteries are the key to power batteries and the smallest unit that makes up a car's power battery. In addition to the differences in positive electrode materials, the structure is also different. Generally, they can be divided into soft packs, squares, and cylindrical batteries. The obvious differences also have their own characteristics. Cylindrical cells have the characteristics of high standardization and good space for heat dissipation. Square lithium cells can be customized according to the size of the product, but at the same time, it is difficult to unify their standards; soft-packed lithium cells are liquid lithium ion cells One polymer shell (aluminum-plastic composite film), which has the characteristics of light weight and large capacity
The finished power battery will be used for the use of new energy electric vehicles. At present, there are already hybrid vehicles on the market. Compared with previous gasoline vehicles, air pollution is greatly reduced, exhaust emissions are reduced in the air, and smog is reduced. In the near future, new energy pure electric vehicles will gradually enter people's vision.