The behavior of the battery is similar to that of people. It can't stand too hot and doesn't like too cold. The most suitable working temperature is between 10-30 ° C. The working environment of cars is very broad, and minus 20-50 ° C is very common. What should we do? Then equip the battery with an air conditioner to realize the three functions of thermal management:

Heat dissipation: when the temperature is too high, the battery will lose its life (capacity attenuation), and the risk of sudden death (thermal runaway) will increase. Therefore, when the temperature is too high, heat dissipation is required.

Heating: when the temperature is too low, the battery will lose its life (capacity attenuation) and weaken (performance attenuation). If it is charged at this time, it will also bury the hidden danger of sudden death (the internal short circuit caused by lithium precipitation may lead to the risk of heat out of control, which may be caused by Shanghai Tesla spontaneous combustion). Therefore, when the temperature is too low, it needs to be heated (or insulated).

Temperature consistency: I still remember the air conditioner in the early 1990s. When it was started, a cold wind blew fiercely and took a break after blowing. Today's air conditioners mostly have the functions of frequency conversion and surround blowing, in order to maintain the consistency of temperature in the two dimensions of time and space. Similarly, the power battery also needs to reduce the spatial difference of temperature as much as possible.