Why does lithium battery performance degrade?

Causes of Lithium Battery Performance Degradation The performance degradation of lithium batteries is a natural result of use and aging on the one hand, and on the other hand, it accelerates its deterioration due to lack of maintenance, harsh use environments, and poor charging operations. 1. High self-discharge rate Various batteries have self-discharge, but improper use will promote the development of this state. The self-discharge rate is an asymptotic law, the highest discharge rate appears just after charging, and then gradually decreases. The percentage of battery self-discharge can be measured with a battery analyzer, but this procedure takes several hours. The measured internal resistance of the battery can often reflect whether the internal resistance of the battery is too high. This parameter can be measured with an impedance meter or with the ohm test program of a battery analyzer. 2. The matching of the battery In the battery pack composed of multiple batteries, the matching of the battery should be controlled within ±2.5%. In battery packs with a large number of batteries, as well as battery packs that need to output large load currents and work at low temperatures, stricter tolerance control of lithium batteries is required. If each battery in a new battery pack has a slight mismatch, after several charging cycles, they will be able to balance each other and adapt themselves. Whether the batteries can be well balanced and adapted is related to whether the battery pack has a long service life. High-quality batteries are more consistent and more balanced than low-quality lithium batteries. High-quality batteries should be used for high-end high-power tools, because they have high durability under heavy loads and extreme temperature environments. Despite the high cost, the reward is that the battery pack has a longer life. 3. Short-circuited batteries Lithium battery manufacturers often cannot explain why certain batteries show high leakage rates or electrical short circuits when the batteries are still in a relatively new state. The suspicious reason is that foreign particles may have been mixed into the battery during the manufacturing process. The other is that rough spots on the electrode cause damage to the diaphragm. Therefore, the manufacturing process of the battery should be improved, which can greatly reduce the early failure rate of the battery. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete.