Precautions for charging lithium-ion batteries

Excessive charging and discharging of lithium-ion batteries can cause permanent damage to the positive and negative electrodes. Excessive discharge causes the negative carbon sheet structure to collapse, and the collapse will cause lithium ions to be unable to be inserted during the charging process; overcharging causes too much lithium ions to be inserted into the negative carbon structure, causing some of the lithium ions to be unable to be released anymore.

The charging capacity is equal to the charging current multiplied by the charging time. When the charging control voltage is constant, the larger the charging current (the faster the charging speed), the smaller the charging power. Excessive battery charging speed and improper termination voltage control point will also cause insufficient battery capacity. In fact, part of the electrode active material of the battery stops charging without sufficient reaction. This insufficient charging phenomenon increases with the increase in the number of cycles.