source：Geerady       date： 2022-06-17
There are many reasons for the expansion of the battery, and the maintenance-free battery is generally a valve-controlled sealed, which will be more expansion opportunities than ordinary batteries. Let's take a look at what the battery will expand:
First, the normal expansion. During the use of maintenance-free batteries, in order to extend the battery life to minimize the starting number of battery safety valves, the outer wall bulging occurs under the internal pressure of the battery. When there is pressure within the interior, the safety valve is not reached, which will cause the outer casing to bulge, as long as it does not exceed the range of bulging, it is normal. This phenomenon is conducive to improving the internal gas composite reaction efficiency of the battery and reducing the evaporation of water.
Second, the balance charging causes the outer wall to expand. When the maintenance battery is just transferred from the discharge state to the charging state, the electrochemical conversion efficiency of its internal electrochemical transformation is relatively high, and the resulting oxygen is relatively small. When the battery is close to full state, the electrochemical conversion efficiency is lowered, and the oxygen generates increases, so that the internal pressure of the battery is slightly rising, and the outer wall of the battery also occurs. Under normal circumstances, the battery is full, which is equilibrium.
Third, abnormal expansion, abnormal expansion may be caused by the following reasons
1. Excessive temperature difference exceeds the normal value, the voltage difference can also cause the battery to prevent the battery in bulging phenomenon
2. The safety valve is out of control. During the charging process, the internal gas is too large, and the safety valve fail does not open, resulting in an internal pressure overhead of the outer wall.
3. Excessive charging voltage is the main cause of the crust of the valve sealing lead-acid battery housing
4. The thermal out of control causes the battery bulge deformation.
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