In the process of charging the battery with an ev charger, the current is controlled to a relatively constant level when the battery voltage is low. When the battery voltage reaches a certain level close to full, the voltage needs to be raised slowly to ensure the battery is fully charged. The charging methods mainly include constant current charging, constant voltage charging, and pulse fast charging. You can choose one or a combination of several methods according to specific situations. Modern intelligent battery chargers can be set with different charging methods.
Constant current charging refers to the method of keeping the charging current constant during charging with ev charger. Constant current charging has a high adaptability and is easy to fully charge the battery, which is beneficial to extend the battery life. The disadvantage is that during the charging process with an ev charger, the charging voltage needs to be adjusted according to the gradually increasing battery electromotive force to keep the current constant, so the charging time is relatively long.
Constant current charging is a standard charging method with the following four charging methods:
Trickle charging, which is a charging method that maintains the battery's full charging status and can just offset the self-discharge of the battery.
Minimum current charging, which is to adjust the charging current to the minimum possible level while ensuring that the battery's capacity is effectively restored from deep discharge.
Standard charging, which is charging at the standard rate with an ev charger for 14 hours.
High-speed (fast) charging, which is a method that fully charges the battery within 3 hours. This charging method requires automatic control circuits to protect the battery from damage.
Constant voltage charging refers to the charging method of keeping the charging voltage constant during the charging process with an ev charger. The charging current decreases as the battery electromotive force increases. The reasonable charging voltage should make the charging current tend to zero when the battery is about to be fully charged. If the voltage is too high, it will cause excessive charging current and overcharging in the early stage of charging. If the voltage is too low, the battery will be undercharged. If the charging current is too large in the early stage of charging, the charging voltage should be appropriately lowered, and then adjusted to the specified value after the battery electromotive force increases. The advantage of using an ev charger for constant voltage charging is that the charging time is short, and the voltage does not need to be adjusted during the charging process, which is more suitable for supplementary charging.
Pulse charging is to charge the battery with a pulse current first, and then let the battery discharge in short, large pulses, making the battery charge and discharge alternately during the entire charging process.