Because the electric vehicle manufacturer reduces the current in order to ensure charging at a low temperature, resulting in a longer time.
Reasons why the battery is not charged:
1, the existence of security redundancy
This is a setting for the battery by the manufacturer, that is, 100% of the battery capacity can really be used in about 80%-90%. The battery will not be too full during use, and the power will not be put into space when driving, which can greatly extend the battery life.
In addition, if safety redundancy is not set, once the charging system fails, it is possible to cause safety accidents such as explosions due to overcharging of the battery.
2. Improper driving
Since the battery pack of most pure electric vehicles is set at the bottom of the vehicle, if you accidentally bump into the battery in the process of driving the vehicle, the battery pack is damaged, which will also make the battery can not be full.
3, did not use the vehicle standard charger for charging
If the maximum current of the charger is less than the numerical requirements of the battery, the battery will be undercharged due to the small current. And it will prolong the charging time, causing the battery to charge for too long, thus damaging the battery.
4. Weather impact
In the northern winter, due to the low temperature, the driving battery power will accelerate the decline, and some manufacturers in order to ensure the safe charging at low temperatures, will also reduce the charging current, and then increase the charging time. From room temperature to minus 25 degrees, the charging time is extended by more than 40%. It leads to a feeling of not being fully charged.