18650 battery charging method introduction

The 18650 battery charging method is a system problem: capacity, current and their relationship, the use of charging methods, the selection of chargers, these will affect the applicability of the 18650 battery charging method and let us start with the choice of charger.

According to the structural characteristics of the 18650 lithium battery and the charging system stipulated by the national standard, a current charger that is less than 1/5 of the battery capacity should be selected (for a small capacity 18650 battery pack, we can select a charging current of 0.5C). The capacity of 18650 battery is more than 1800~2600mAh. The selected lithium battery charger should be between 350~500mAh. The correct choice of charger can avoid the damage of large current to the battery, and can also strive for safety. The charging time is the shortest. In this sense, selecting the charger is the first important in the 18650 battery charging method.

On the selected charger, the 18650 battery charging method is divided into two steps: first constant current and then constant voltage. The first step is constant current charging until the voltage rises to 4.2V. The second step is to switch to constant voltage charging after the voltage reaches the charger setting value. When constant voltage charging, the voltage does not change, the current gradually decreases, and the current is reduced. Stop charging when it is as small as 0.02C.

For the 18650 battery without the protection board, it is necessary to improve the 18650 battery charging method to facilitate the formation of a long-term mechanism to improve the performance of the battery, specifically: for the newly activated or long-term 18650 lithium battery to be subjected to two or three deep charge and discharge This helps the battery form a protective film on the negative electrode to prevent the battery from "passivating", which is not required for batteries with protective plates.

Because lithium batteries have no memory effect, they can be charged at any time in theory and can be discharged at any time. However, charging for a long time in the case of sufficient power will still affect the total efficiency of the battery. The important point of the 18650 battery charging method is: don't rush to charge when the battery power is just 20~30%, because this four or five shallow discharges is equivalent to a full discharge. The test shows that the final result of shallow discharge is : The 18650 battery charging method with frequent discharge type can provide less total power than normal (85%~90% of charge). The total charge of the discharge type 18650 battery charging method can provide nearly 1/4 of the total power. The method of electric time is also very simple. As long as the power of the 18650 battery reaches that moment, the electric appliance will give an indication signal.

Through the introduction of the 18650 charging method, we have clearly selected the 18650 battery charger selection criteria, understand that the 18650 battery charging method is constant current and constant voltage, and how to choose the charging timing, according to the 18650 battery charging method, I believe your battery will be powered forever, the destruction will never come.

The page contains the contents of the machine translation.