What is the impact of low temperature on the performance of lithium-ion battery packs?

The influence of low temperature on the performance of lithium-ion battery packs▲The influence of low temperature on the charging and discharging performance of lithium-ion batteries. With the decrease of temperature, the average discharge voltage and discharge capacity of lithium-ion batteries are reduced, especially when the temperature is -20℃, the discharge capacity and discharge of the battery The average voltage drops faster. ▲Low temperature affects the cycle performance. The battery capacity decays faster at -10°C. After 100 cycles, the capacity is only 59mAh/g, and the capacity decays 47.8%; the battery that has been discharged at low temperature will be charged and discharged at room temperature. , The capacity recovery function during the examination period. Its capacity was restored to 70.8mAh/g, with a capacity loss of 68%. It can be seen that the low temperature cycle of the battery has a greater impact on the recovery of the battery capacity. ▲Low temperature affects safety performance. Lithium-ion battery charging is a process in which lithium ions are removed from the positive electrode and transferred to the electrolyte to be embedded in the negative electrode material. Lithium ions are polymerized to the negative electrode, and one lithium ion is captured by six carbon atoms. At low temperatures, the chemical reverberation activity is low, and the lithium ion migration slows down. The lithium ions on the surface of the negative electrode have not been inserted into the negative electrode and have been reduced to metallic lithium, and precipitated on the surface of the negative electrode to form lithium dendrites, which are easy to pierce. The barrier causes a short circuit in the battery, which in turn damages the battery and causes peace and disorder. Lithium-ion battery packs are best not to be charged in winter. Due to the low temperature, the lithium ions nested on the negative electrode will show ion crystals and directly pierce the barrier. Under normal circumstances, a micro-short circuit will affect the life and performance, and it will explode seriously. Therefore, some people reported that the lithium-ion battery cannot be charged in winter because the department has brought the battery management system because the product is protected. 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: Correct charging method for lithium iron phosphate battery pack