What is the important effect of temperature on lithium battery packs?

Regarding the lithium battery pack, the internal heat of the battery includes reaction heat, polarization heat and Joule heat. An important reason for the increase in temperature of lithium battery packs is the increase in temperature caused by the internal resistance of the battery. In addition, due to the dense placement of the heating battery bodies, the middle area will inevitably collect more heat, and the fewer edge areas will increase the temperature imbalance between the individual cells in the lithium battery pack. The impact of different temperatures on the performance of the lithium battery pack When the temperature drops from 18°C u200bu200bto 0°C, the internal resistance of the 150Ah lithium battery pack doubles. Below 0°C, the discharge capacity of the lithium battery pack decreases faster. When the temperature drops to -10°C, the internal resistance of the lithium battery pack doubles. The heat consumption rate of lithium battery packs is different at different temperatures, because the chemical reaction inside the battery is closely related to temperature. The ambient temperature is low, and the lithium battery pack will react with more heat when it is running. The working environment temperature of the lithium battery pack has a certain influence on the battery's internal resistance, heat consumption rate, discharge capacity, cycle life, state consistency, etc. Temperature adjustment method Internal adjustment places the temperature sensor in the most representative place with the largest temperature change, especially the highest temperature and lowest temperature, and the area where the heat accumulation in the center of the lithium battery pack is strong. External adjustment and cooling adjustment: At present, considering the complexity of the thermal management structure of the battery pack, most of the air-cooling methods with simple structure are adopted. And considering the uniformity of heat dissipation, most of the parallel ventilation methods are used. Heating adjustment: The simplest heating method is to add heating plates above and below the lithium battery pack for heating, and also to wind a heating wire before and after each lithium battery pack or use a heating film to wrap the entire lithium battery pack for heating. 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 post: Do you know how to repair lithium battery packs?