When the ambient temperature of the traditional battery decreases 10℃, the internal resistance of the battery increases by about 15%, the internal resistance of the battery exceeds the normal value by 25%, and the capacity has been reduced to about 80% of its nominal capacity. If the internal resistance of the battery exceeds 50% of the normal value, the capacity of the battery has been reduced to less than 80% of its nominal capacity. If the new battery is designed in parallel with the traditional battery, it can release large current instantly and solve the problem of difficult start-up of equipment at low temperature.