Electric vehicles have been charging will have an impact, the battery management system will be due to the battery power down to the need to charge the state, charging, and then continue to stop charging, so frequent operation, resulting in overcharging of the battery. The following is the daily maintenance of electric vehicle batteries: the charging time should not be too long: new energy vehicles should not overcharge, over-discharge and under-charging, which will shorten the battery life. In addition, if the charging process battery temperature exceeds 65 degrees Celsius, the charging should be stopped immediately to avoid danger.