Causes and hazards of inconsistency of lithium battery packs

Please forgive me for the reasons and hazards of the inconsistent lithium battery pack! The inconsistency and damage of the lithium battery pack are caused, please forgive me! If the voltage of the lithium battery pack is inconsistent, what damage will it cause? How to deal with the inconsistent lithium battery pack damage? Inconsistent lithium battery parameters Sexual importance refers to the inconsistency of capacity, internal resistance and open circuit voltage. The inconsistency of battery function is formed during processing and deepens during application. Today the author will show you the consistency of lithium battery packs. The concept of inconsistent lithium battery packs The inconsistency of lithium battery parameters mainly refers to the inconsistency of capacity, internal resistance and open circuit voltage. During the operation of the battery, as the battery continues to charge and discharge cycles, initial inconsistencies continue to accumulate, resulting in a large difference in the state (SOC, voltage, etc.) of a single battery. The working environment of lithium battery packs is also different for individual batteries. Therefore, the inconsistency of individual batteries is gradually amplified during use, which in some cases accelerates the attenuation of individual battery functions, and ultimately leads to premature failure of lithium batteries. Reasons for the inconsistency of lithium battery packs The inconsistency of lithium battery packs is an accumulation process. In addition, lithium battery packs will also be affected by the application environment. In the future application process, the inconsistency of a single battery will gradually be amplified, leading to accelerated degradation of some single battery functions, and ultimately leading to battery failure. The inconsistency of lithium battery packs is mainly affected by time, and the reasons are important in two aspects: 1. First, there will be some problems during the processing, such as process problems, uneven materials, etc. These problems will cause subtle differences in materials Wait. Lithium battery: After the lithium battery pack is put into use, the electrolyte density, temperature, ventilation conditions, self-discharge degree, charge and discharge process of each battery in the battery pack have different degrees of influence. 2. During loading and use, the electrolyte density, temperature, ventilation conditions, self-discharge degree and charge-discharge process of each battery in the lithium battery pack have different effects. If the lithium battery pack is inconsistent, what damages and problems will occur? (1) Capacity loss, the capacity of the battery cell lithium battery pack conforms to the barrel principle, and the worst capacity is the resolution of the entire battery of the battery cell. The life loss is large, the battery capacity is small, it is full every time, and the output power is too large, which may be the first point of life. Always the end of the battery life, a group of batteries are welded together, and then the life is ended. The internal resistance increases, the internal resistance is different, and the battery has relatively more internal resistance heat through the same current. The battery temperature is too high, resulting in faster aging, and the internal resistance will further increase. Internal resistance and temperature rise form a pair of negative feedback, which accelerates the degradation of cells with high internal resistance. How to deal with the inconsistency of lithium battery packs? △Separation: Different batches of cells should not be used together in theory. Even the batteries of the same batch must be screened. The batteries with relatively convergent parameters are in a lithium battery pack, the same battery pack. △ Heat treatment: Regarding batteries with inconsistent internal resistance, heating is not the same problem. The newly added heat treatment system can adjust the temperature difference of the entire lithium battery pack to keep it within a small range. A battery that has more heat will still experience a high temperature increase, but it will not be distinguished from other batteries, and the degradation level will not appear to be a significant distance. Battery balance: In order to solve this problem, the battery balance system BMS has designed a balance function. Ensure a good use environment for the lithium battery pack, try to ensure a constant temperature, reduce vibration, and ensure that water, dust, etc. pollute the battery pole. Grasp the development law of inconsistency of single cell of lithium battery pack, adjust or replace the battery with extreme parameters in time to ensure that the inconsistency of battery pack parameters does not increase with the time of use. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Analysis of the working principle of flow battery