Why is the battery life of electric vehicles shorter in winter?

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. There is no method for detailed and obligatory quantification. Because the activity of lithium batteries is too high, consistency is also the biggest problem. Even products of the same batch, the same material, and the same process will have very different performance. Many experiments have been done, and the low-temperature performance of different materials of lithium batteries is also different. The hottest lithium iron phosphate at present has the worst low-temperature performance. Our product discharges 89% of the maximum capacity at -10℃, which should be in the industry It is relatively high; the discharge capacity can reach 95% at 55°C, and the attenuation at relatively low temperature is relatively small. This is still a product to be inspected. As everyone knows, the quality is much higher than that of a normal product on the assembly line. Relatively speaking, the low temperature performance of lithium manganese oxide, lithium cobalt oxide and ternary products is better, but it is also limited; and the sacrifice is high temperature performance. At present, lithium iron phosphate has high safety performance and good high temperature performance in the industry. In fact, the battery activity is not as high as the above three types, and it is relatively safer. The overall performance is still not as good as manganese lithium or ternary. Therefore, some people reported that lithium batteries could not be charged in winter. Some of them brought the battery management system because the product was protected, and others could not charge it due to quality problems. The use time of lithium batteries in winter is inevitably shorter than in summer. I would like to remind everyone that it is best not to charge lithium batteries in winter. Due to the low temperature, the lithium ions nested on the negative electrode will crystallize 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! 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 article: How to use lithium batteries correctly?