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What is overcharging and how does it affect battery performance?

Views: 0     Author: Site Editor     Publish Time: 2023-08-10      Origin: Site

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Overcharging refers to the behavior of a battery being fully charged after a certain charging process, and then continuing to charge. For Ni-MH batteries, overcharging produces the following negative effects


Should:


Positive electrode: 4OH -4e → 2H2O+O2 ↑; ①


Negative electrode: 2H2+O2 → 2H2O ②


Due to the higher capacity of the negative electrode compared to the positive electrode during design, the oxygen generated by the positive electrode is compounded with the hydrogen generated by the negative electrode through the diaphragm paper


Under normal circumstances, the internal pressure of the battery will not increase significantly, but if the charging current is too high or the charging time is too long, the oxygen generated will not be sufficient


If consumed, it may cause an increase in internal pressure, deformation of the battery, leakage, and other adverse phenomena. At the same time, its electrical performance will also significantly decrease.


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