18650 battery charging method
18650 battery charging method
18650 battery charging method is a system problem: capacity, current and their relationship, charging mode, charger selection, which will affect the applicability of the 18650 battery charging method, let us start with the choice of charger first.
It's better to select a charger that the current less than 1/5 of the the capacity (For the small capacity 18650 battery, we can completely select the 0.5C charging current ). On the market, 18650 battery capacity is more than 1800~2600mAh, and the selected li ion battery charger should be between 350~500mAh, The proper selection of the charger can avoid the damage of large current to the battery and the shortest charge time in the safe range. In this sense, choosing the charger is the first important for 18650 battery charging method.
After selected the charger, the 18650 battery charging method is divided into two steps: constant current first then constant voltage. The first step is the constant current charging to the voltage up to 4.2V. The second step is to turn into the constant voltage charging after the voltage reaches the charger setting value. When the constant voltage is charged, the voltage is constant, the current is gradually reduced, and the charge is stopped when the current is reduced to 0.02C.
For 18650 batteries without protective panels, the 18650 battery charging method needs to be improved to facilitate the formation of a long-term mechanism to improve the performance of the battery. Specifically, for the newly enabled or long shelved 18650 lithium batteries, the two or three depth charge and discharge will be required, which will help the electric pool to form a protective film on the negative electrode and prevent the battery from forming a protective film. The battery is "passivated", but not for batteries with protective plates.
Because of the li ion battery has no memory effect, it can be charged at any time at any time in theory, but it will still affect the total efficiency of the battery when the electricity is still sufficient for a long time. The important part of the 18650 battery charging method is: do not rush to charge when the battery is just going to 20~30%, because the four or five shallow discharge is equivalent to a full discharge. The experiment shows that the final result of the shallow discharge is that the total amount of electricity used by the 18650 battery charging method of the frequent discharge is less than that of the battery. The normal (charged 85%~90%) discharge 18650 battery charging method can provide the total amount of electricity, an average of nearly 1/4, and the method of judging the normal time of compensation is very simple. As long as the quantity of the 18650 battery reaches that moment, the electrical appliance will send out the indication signal.