What are the effects of charging lithium batteries in a low temperature environment?

Lithium battery charging in low temperature environment has certain risks. Because as the temperature decreases, the kinetic characteristics of the graphite negative electrode become worse. During the charging process, the electrochemical polarization of the negative electrode is clearly intensified, and the precipitated metal lithium is likely to form lithium dendrites, piercing the diaphragm and causing the short circuit of the positive and negative electrodes. . Try to be wary of lithium batteries charging at low temperatures. Due to the low temperature, the lithium battery nested on the negative electrode will crystallize ions and pierce the diaphragm straightly. Under normal circumstances, it will cause a micro short circuit which affects the life and performance, and may explode seriously! According to the research of experts: the use of lithium batteries in a low temperature environment for a short period of time, or when the temperature is not low enough, will only temporarily affect the battery capacity of the lithium battery, but will not cause permanent damage. But if it is used in a low temperature environment for a long time, or in an ultra-low temperature environment of -40 ℃, the lithium battery may be frozen and cause permanent damage. Low-temperature use of lithium batteries has problems such as low capacity, severe attenuation, poor cycle rate performance, clear lithium evolution, and unbalanced lithium deintercalation. However, with the continuous expansion of the scope of use, the restrictions brought by the low-temperature performance of lithium batteries have become more and more obvious. In the fields of aerospace, military, electric vehicles, etc., batteries are required to work normally at -40°C. Therefore, improving the low-temperature properties of lithium batteries is of great significance. Regarding lithium batteries, there is currently no clear theory in the industry to support the inevitable connection of internal resistance, discharge platform, life, and capacity under various temperature performance. The relevant calculation formulas and mathematical models are still in the groping stage. In general, lithium batteries are not sensitive to the temperature in the range of 0-40°C, but once the temperature exceeds this range, the life and capacity will be compromised. The low-temperature performance of different materials of lithium batteries is also different. The hottest lithium iron phosphate currently has the worst low-temperature performance. Our products have a discharge capacity of 89% of the maximum capacity at -10°C, which should already be relatively high in the industry; The discharge capacity can reach 95% at 55℃, and the attenuation at relatively low temperature is relatively small. 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: Analysis of daily maintenance of new energy vehicle batteries