Methods to improve the consistency of lithium batteries

　　1 Control of production process The control of production process is mainly carried out from two aspects: raw materials and production process. In terms of raw materials, try to select the same batch of raw materials to ensure the consistency of particle size and performance of raw materials. In terms of production technology, the entire production process should be strictly controlled, such as ensuring that the slurry is stirred evenly and not placed for a long time, controlling the speed of the coater to ensure the thickness and uniformity of coating, checking the appearance of the electrode, weighing and grading, controlling the liquid injection amount and the formation, volume and storage conditions.

　　etermined the key processes that have a significant impact on the consistency of lithium ion batteries through the research on the preparation process technology of lithium ion batteries, mainly including batching stirring, coating, rolling, winding/laminating, liquid injection and formation, and made in-depth research and analysis on the relationship between the key process parameters and battery performance.

　　2. Control of the assembly process The control of the assembly process mainly refers to the sorting of batteries. The batteries are of uniform specifications and models, and the voltage, capacity, internal resistance, etc. of the batteries should be measured to ensure the consistency of the initial performance of the batteries.

　　Through research, Xu Haitao et al. found that the voltage difference of single battery is an important factor affecting the consistency of each single battery at the end of the battery pack charging and discharging, and the difference of the internal resistance of single battery causes a large difference in the voltage level of each single battery during the battery pack charging and discharging. Wang Linxia et al. analyzed the influence of DCR, the main influencing factor in the parallel battery pack, on the battery pack and the influence of capacity, the main influencing factor in the series battery pack, on the battery pack through the research on the inconsistency of single cells in the lithium ion series parallel combination battery pack, providing the necessary basis for the combination battery pack. Chen Ping et al. found that with the increase of the discharge rate, the inconsistency of the battery was magnified to eliminate bad batteries through the research on the impact of the discharge rate on the battery matching consistency.

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