202V Ni-MH Battery Pack for Toyota Prius Gen2
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What is the internal pressure of the battery?
Refers to the internal air pressure of the battery, which is caused by the gas generated during the charging and discharging process of the sealed battery, and is mainly affected by factors such as battery material, manufacturing process, and battery structure. The reason for this is mainly due to the accumulation of gas inside the battery and the gas generated by the decomposition of the organic solution in the battery. Generally, the internal pressure of the battery is maintained at a normal level. In the case of overcharge or overdischarge, the internal pressure of the battery may increase:
For example, overcharge, positive: 4OH- - 4e → 2H2O + O2↑; 1
The generated oxygen reacts with the hydrogen evolved on the negative electrode to form water 2H2 + O2 → 2H2O 2
If the rate of reaction 2 is lower than the rate of reaction 1, the generated oxygen is too late to be consumed, resulting in an increase in the internal pressure of the battery.
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