Do not charge lithium-ion batteries at low temperatures

Do not charge lithium-ion batteries at low temperatures. In winter, electric vehicle users have a noticeable feeling that the battery life is shorter! Why is this? Regarding lithium-ion batteries, there is currently no clear theory to support lithium-ion batteries under various temperature functions. The internal resistance, discharge platform, life and capacity. Related calculation formulas and mathematical models are still in the exploratory stage. Generally speaking, lithium-ion batteries are not sensitive to the temperature in the range of 0-40c, but beyond this range, their life and capacity will be reduced. At present, there is no way to determine the specific amount, because the high activity and consistency of lithium-ion batteries are also the biggest problems. Even the same batch of products, the same data, and the same process have very different functions. After many tests, the low-temperature performance of lithium-ion batteries with different data is also different. Now the hottest lithium iron phosphate has the lowest low temperature function. The release capacity of our products at -10°C is 89% of the maximum release capacity, which should be relatively high in the industry. At 55°C, the discharge capacity can reach 95%, and the attenuation at lower temperatures is still small. This is still the product to be inspected, you know, its quality is much higher than the normal product on the assembly line. Relatively speaking, lithium manganese oxide, lithium cobalt oxide and ternary products have better low-temperature functions, but they also have limitations; the sacrifice is high-temperature functions. At present, the safety function of blown lithium iron phosphate in the industry is relatively high, and the high temperature function is also relatively good. In fact, the activity of the battery is not as high as the above three, and it is relatively safe. The overall function is still not as good as manganese, lithium or ternary. Therefore, some people complain that lithium-ion batteries cannot be recharged in winter. Part of the reason they adopted the battery management system was that the product was protected. The service life of lithium-ion batteries in winter will definitely be shorter than in summer. Here to remind everyone that it is best not to charge lithium-ion batteries in winter. Due to the low temperature, the lithium ions nested on the negative electrode will crystallize and directly penetrate the gap. Generally, a small short circuit will be formed, which will affect the service life and function. In severe cases, it may burst! Disclaimer: Some pictures and pictures of articles published on this site The content comes from the Internet, if there is any infringement, please contact to delete the previous article: Li-ion battery charging principle: the selection method of charging voltage and current