What are the effects of temperature on the charge and discharge performance of lithium batteries?

The effect of temperature on the charge and discharge performance of lithium batteries 1. If the temperature drops, the internal reaction rate of the lithium battery will decrease, and the power output of the battery will also decrease; if the temperature rises, the opposite is true, that is, the output power of the lithium battery will increase. 2. However, if the temperature is too high to exceed 60°C, it will destroy the chemical balance in the battery and cause side reactions; the performance of rechargeable battery materials at high temperatures will degrade, and the cycle life of the battery will also be greatly shortened. 3. Under the changing environmental factors, the environmental temperature has a greater impact on the charge and discharge performance of the battery, because the electrochemical reaction at the electrode/electrolyte interface is related to the ambient temperature, and the electrode/electrolyte can be called the heart of the battery ; When the temperature drops, the reaction rate of the electrode will drop. The change of temperature directly affects the discharge performance and discharge capacity of the lithium battery; the temperature decreases, the battery internal resistance increases, the electrochemical reaction speed slows down, the polarization internal resistance increases rapidly, and the battery discharge capacity and discharge platform decrease. Affect battery power and energy output. Many battery users don’t know that consumer-grade lithium batteries cannot be charged below 0°C. Although the battery pack appears to be charged normally, metal lithium plating may occur on the anode during low-temperature charging. This plating is permanent. , Will not be eliminated with the charging cycle; if exposed to vibration or other stress conditions, the lithium battery is more prone to failure, and advanced chargers can prevent the lithium battery from charging when the temperature is lower than the freezing temperature. Regarding lithium batteries, the discharge capacity drops sharply under low temperature conditions, but under high temperature conditions, the discharge capacity is not lower than normal temperature, and sometimes slightly higher than normal temperature capacity. The important thing is that the lithium ion migration speed increases under high temperature conditions. Lithium electrodes are not like nickel electrodes. As with hydrogen storage electrodes, decomposition or formation of hydrogen occurs under high temperature conditions, which reduces the capacity. When the battery module is discharged at low temperature, as the discharge progresses, heat appears due to resistance and other reasons, which causes the battery temperature to rise, which is manifested as a rise in voltage. As the discharge progresses, the voltage gradually drops. The best use temperature of lithium battery is 0~35℃, low temperature environment will reduce the activity of lithium ion, the battery discharge capacity will be weakened, and the use time will be shortened; if the lithium battery is in the low temperature environment for a short time, this damage is only temporary Will not damage the battery capacity. When the temperature rises, the performance will recover. 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 post: What are the advantages and disadvantages of Ni-MH batteries and lithium batteries?