Influencing factors and measurement methods of lithium battery self-discharge
The self-discharge reaction of lithium-ion batteries is inevitable. Their existence not only leads to a reduction in the capacity of the battery itself, but also seriously affects the battery's cycle life. The self-discharge rate of lithium-ion batteries is generally 2% to 5% per month, which can fully meet the use requirements of single cells. However, once the single lithium battery is assembled into a module, the characteristics of each single lithium battery are not completely consistent, so after each charge and discharge, the terminal voltage of each single lithium battery cannot reach complete consistency, which will cause If overcharged or overdischarged cells appear in the module, the performance of the cell lithium battery will deteriorate. As the number of charging and discharging increases, the degree of deterioration will be further exacerbated, and the cycle life will be greatly reduced compared to unassembled single cells. Therefore, in-depth research on the self-di...