It is not accurate to say that charging in sub-zero temperatures will damage the battery. In fact, the battery systems of modern electric vehicles have been carefully designed to safely charge at low temperatures. However, the sub-zero temperature will cause the fluidity of the electrolyte inside the battery to decrease, which will affect the charging speed and efficiency. In addition, if the battery is not heated properly, it may affect its life and performance.
Therefore, when charging in a cold environment, it is best to use an on-board heating system to increase the battery temperature to ensure the best charging effect and protect the battery. In general, although charging at sub-zero temperatures will not directly damage the battery, appropriate measures need to be taken to ensure the safety and performance of the battery.
Low temperature charging will cause certain harm to electric vehicle batteries. At low temperatures, the chemical reaction inside the battery slows down, causing the charging process to become unstable, affecting the charging efficiency and performance of the battery.
In addition, at low temperatures, the resistance of the battery will increase, and the charge transmission speed will be slow, resulting in the local charge and discharge imbalance within the battery, thus accelerating the aging and damage of the battery.
Therefore, it is recommended to take some measures when charging in a low temperature environment, such as pre-heating the battery or using a specially designed low temperature charging device to reduce the harm to the battery.
The main temperature decreases, the participation of lithium ions in the reaction slows down, the diffusion rate decreases, and it is easy to polymerize at the negative graphite of the battery, while the embedded graphite speed decreases, and the active lithium ions can participate in the electrochemical reaction decreases, which causes the capacity of the entire battery to decay.