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What are the overcharge and overdischarge, and what are the effects of them on battery performance?

- Feb 14, 2019 -

Overcharge refers to the behavior that the battery continues to be charged after being fully charged in a certain charging process.As in the design, the negative capacity is higher than the positive capacity, therefore, the positive generated gas through the membrane paper and the negative generated pot composite. Therefore, under normal circumstances, the internal pressure of the battery will not increase significantly, but if the charging current is too large, or the charging time is too long, the generated oxygen will not be consumed in time, which may cause the internal pressure to riseAlso deformation, leakage, and other adverse phenomena. At the same time, its electrical performance will be significantly reduced.

After the battery has finished discharging the quantity of electricity stored inside, the voltage reaches a fixed value, and then continues to discharge, it will cause over-discharge, usuallyThe cut-off voltage is determined according to the discharge current.0.2c-2c discharge is generally set at 1.0v/bar. Above 3c, if 5C or 10C discharge is set at 0.8v/bar, over-discharge of the battery may bring disastrous consequences to the battery, especially for large current over-discharge, or repeated over-discharge has a greater impact on the battery. Generally speaking, overdischarge will increase the battery internal pressure, and the reversibility of positive and negative active substances will be destroyed.Charging can only partially recover, the capacity will also decrease significantly.