In recent years, the development of the new energy vehicle industry has developed rapidly, with the requirements of the performance of lithium-ion batteries in new energy vehicles. As the main power battery of electric vehicles, lithium-ion batteries have the characteristics of high power, high energy density, long life, low self-discharge rate, long storage time, non-pollution, and fast charging. In the northern region of China, the temperature in winter is often lower than the freezing point temperature, and the ambient temperature has a great impact on the performance of lithium batteries.
Studies have shown that under low-temperature environments, the charging and discharge time of lithium batteries will be shortened as the temperature decreases, and the initial voltage of the charging will increase. After 30 minutes of charging, the opening voltage decreased as the temperature decreased. After 30 minutes of discharge, the opening voltage increased with the temperature decreased; when the ambient temperature was -12 ° C, as the charging and discharge current decreased, the required charging and discharge time increased, and the power of the use of low magnification and release is greater than the power charging and released by the use of high magnification. It can be concluded that the use of lithium-ion batteries at low temperatures will decrease significantly, which can greatly affect the work efficiency of the battery. Therefore, when using lithium batteries in low-temperature environments, it can increase its use of temperature or reduce its current to obtain better performance.
