What factors affect the dispersion of lithium-ion batteries?

1. The internal resistance of the battery, especially the inconsistency of the polarization internal resistance, causes the voltage of individual batteries to change drastically during the charging and discharging process, which leads to drastic changes in the entire battery pack; 2. The inconsistency of the voltage of the single battery will affect the battery pack’s performance. The peak shaving ability reduces the energy released by the overall battery pack; 3. Due to the exothermic and endothermic processes during battery operation, the battery temperature will continue to change. When overheated, it will bring performance degradation and safety hazards. Facts have proved that in recent years The fuse of electric vehicle operation and detection of fire is caused by the inadequate over-temperature protection, which caused the battery to heat up and fire. The battery types include not only lithium manganate, but also lithium iron phosphate batteries; 4. The capacity is discrete. Serious factors, inconsistent capacity, mainly cause performance problems in two aspects. One is that some batteries will be overcharged and overdischarged, leading to unsafe factors such as burning and explosion. The other is that low-capacity single cells end work early, affecting The energy of other single cells in the entire battery pack cannot be released, causing the life of the entire battery pack to decay. In order to reduce the negative impact of lithium-ion battery dispersion and to meet the requirements of battery pack uniformity to the greatest extent, improvements should be made from the following production and use perspectives. 1. During the processing, the design of the lithium-ion battery ensures that it meets the requirements of large-scale mechanized processing, and seeks to control the quality of the product to ensure the uniformity of the material and internal structure of the single battery. 2. In use, the sorting and matching technology must be optimized first, so that the consistency of the lithium-ion battery pack in the initial period of use is satisfied; secondly, the internal temperature imbalance of the battery is weakened, the current density is as uniform as possible, and the battery contact resistance is reduced. the way. 3. Detect the surface temperature and flow rate of the battery pack, and select a reasonable and scientific ventilation structure to make the surface temperature of the entire battery pack uniform and ensure that each battery is in the same temperature environment when the battery pack is used. Poor battery consistency is a difficult process in the battery pack manufacturing process. The current control methods are not perfect enough, but it is necessary to strengthen the understanding of the dispersion of lithium-ion batteries to improve the consistency of lithium-ion batteries, and it is also necessary to do this well. Foundation. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Battery maintenance and battery repair instrument principle