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Tips on Charging Voltage and Current for Lithium Batteries
2022-03-10
Voltage:
If the battery voltage is greater than the preset voltage threshold and less than the maximum voltage of 4.2V, the IC will charge the battery with the maximum charge current set on the external resistor. until it equals the maximum charge voltage (around 4.2V).
Li-ion battery charging starts with a constant current charge, i.e. the current is constant and the battery voltage will gradually increase with the charging process. When the battery terminal voltage reaches 4.2V (4.1V), constant current charging will change to constant voltage charging, i.e. the voltage is constant and the current decreases gradually as the charging process continues, depending on the saturation of the battery, and when it is reduced to 0.01C, charging is terminated.
On the other hand, the national standard states that the charging time should not exceed 8 hours. In other words, even if it has not yet reached 0.01C, by the end of 8 hours, charging can be considered to be over. For Li-ion battery packs with increasing capacities, it is necessary to increase the charging current value in order to achieve this satisfactory charging rate.
If the battery voltage is greater than the preset voltage threshold and less than the maximum voltage of 4.2V, the IC will charge the battery with the maximum charge current set on the external resistor. until it equals the maximum charge voltage (around 4.2V).
As the charging time increases, the voltage of the Li-ion battery cell gradually rises. The charger is also constantly adjusting the output voltage. When the output current is less than 2A, the charging current gradually decreases as the lithium-ion battery cell voltage rises. It can be said to have entered the constant voltage phase. When the voltage of some cells in the battery pack exceeds 4.2V, the protection board is activated in time to cut off the incoming current.
Li-ion battery charging starts with a constant current charge, i.e. the current is constant and the battery voltage will gradually increase with the charging process. When the battery terminal voltage reaches 4.2V (4.1V), constant current charging will change to constant voltage charging, i.e. the voltage is constant and the current decreases gradually as the charging process continues, depending on the saturation of the battery, and when it is reduced to 0.01C, charging is terminated.
On the other hand, the national standard states that the charging time should not exceed 8 hours. In other words, even if it has not yet reached 0.01C, by the end of 8 hours, charging can be considered to be over. For Li-ion battery packs with increasing capacities, it is necessary to increase the charging current value in order to achieve this satisfactory charging rate.
