Lithium-ion Battery PartsThe industry barrier of lithium battery precision structural parts is relatively high. From the information published on the Internet, it can be found that whether it is a hard shell or a soft package, the manufacturing process of the structural cover plate and aluminum-plastic film is very complicated. For example, in cylindrical batteries, whether it is 1865, 2170 or 4680, the number of battery cells in the entire car-grade battery is hundreds or thousands, and the cells follow the "barrel effect" mentioned at the beginning of the article, so the consistency requirements of the entire battery are very high.
In the structural part, in addition to the basic processes of "stamping, welding and injection molding" and "stamping, stretching", the cover plate and the shell also need to add a series of safety valve explosion-proof design for structural optimization and upgrading. Extended technology, which puts forward higher requirements for large-scale precision manufacturing. Therefore, the industry generally develops and uses automated equipment and flexible production lines to meet the needs of large-scale precision manufacturing.
In addition, starting from the 4680 battery structure, because it is much larger than the 2170, it also has new requirements for the battery case, because the 4680 increases the size of the battery, but the proportion of cells is decreasing, and each cell is charged and discharged. To withstand a larger current, the heat generation will also be more, and the volume energy density will be slightly reduced after grouping, which has higher requirements on the heat dissipation, welding technology, safety and sealing of the battery.