What causes the battery to swell?
TorchN answers for you:
The main cause of battery expansion is that the battery is overcharged. First of all, let's understand the charging of the battery. The battery is the conversion of two kinds of energy. One is: electrical energy; the other is: chemical energy.
When charging: electrical energy is converted into chemical energy;
When discharging: chemical energy is converted into electrical energy;
First understand the discharge: when the battery is discharged to the outside, then chemical energy is converted into electrical energy. Because chemical energy is limited, it cannot output more electrical energy than chemical energy.
But it's different when charging. When the battery is charging
Electric energy> Chemical energy: Part of the electrical energy is converted into chemical energy, and the other is converted into thermal energy. (You can draw pictures) So the battery will be a bit hot when charging.
When electrical energy »chemical energy: a part of electrical energy is converted into chemical energy, but a large part of the current is converted into thermal energy. The battery is highly heated. The large amount of gas exhausted inside the battery will cause less sulfuric acid and increase the internal resistance of the battery. The battery will become hotter and hotter until the battery case softens and deforms. Because the internal pressure of the battery is relatively large, the battery will appear to expand.
Of course, there are other reasons, as the next topic to explain to you.
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