As the ambient temperature changes, the capacity of the energy storage battery will also change accordingly. Under normal circumstances, the capacity of the energy storage battery is calibrated at 25°C. When the ambient temperature is lower than 0C, the capacity of the energy storage battery will drop sharply to 90% ~ 95% of the nominal capacity, and it will drop to about 90% at -20C. 70% ~80% of the nominal capacity. Therefore, the impact of ambient temperature on the capacity of energy storage batteries cannot be ignored. When the ambient temperature is too low, corresponding insulation measures should be taken, including moving indoors and burying them underground.