Comparison of battery self-discharge at high temperature and self-discharge at room temperature

Differences between chemical and physical self-discharge 1. Comparison of high-temperature self-discharge and normal-temperature self-discharge. Physical micro-short circuit and real-time contact are both significant. Long-term storage is more useful for physical self-discharge selection; high-temperature chemical self-discharge is more useful. Obviously, use high temperature storage to choose. According to the high temperature 5D method, room temperature 14D storage: Assuming that battery self-discharge is mainly physical self-discharge, room temperature self-discharge/high-temperature self-discharge ≈2.8; assuming battery self-discharge is mainly chemical self-discharge, room temperature/high-temperature self-discharge u003c2.8. 2. Comparison of self-discharge before and after the cycle Cycle will constitute a micro-short-circuit melting inside the battery, thereby reducing physical self-discharge, so: assuming that the self-discharge of the battery is mainly physical self-discharge, then the self-discharge after the cycle is significantly reduced; assuming that the battery is self-discharged The most important discharge is chemical self-discharge, and there is no obvious change in self-discharge after cycling. 3. Check the leakage current under liquid nitrogen The leakage current of the battery under the use of liquid nitrogen was measured with a high voltage detector. When the following situations occur, the micro-short circuit is serious and the physical self-discharge is large: 1) The leakage current is large under a certain voltage; under different voltages, the ratio of the leakage current to the voltage changes greatly. 4. Gap black spot analysis. The physical self-discharge of the battery and its possible reasons are determined by the number of surveys and measurements, paintings, black spots, size and element composition gaps, etc.: 1) Generally speaking, the more physical self-discharge is The larger the number of black spots, the deeper the painting (especially the gap on the other side); 2) According to the metal element composition of the black spots, distinguish the metal impurities that may be contained in the battery. 5. Comparison of self-discharge of different SOCs. Under different charged states, the contribution of physical self-discharge is different. After experimental verification, the physical self-discharge abnormal battery can be distinguished more simply under the 100% state of charge. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: The operating principle of the new type of lithium battery