The reason of bulge deformation of the battery mainly is the pressure beside the battery. The main reasons are as follow.
(1) Open the valve pressure relief valve is too high, or the relief valve block. When the pressure increases to a certain degree of the valve can't normal open, in this case is bound to cause the bulge deformation.
(2) Set too high float charging voltage, charging current is big, lead to positive plate on O2 precipitation is accelerated, and too late in the cathode compound, at the same time, the temperature rise of cells in the body quickly, the exhaust, pressure reaches a certain, the bulge deformation to appear VRLA battery.
(3) in the operation of VRLA battery in series battery pack, in particular, if for charging the battery pack, if you have poor quality batteries often arise within gas composite adverse phenomenon, which appear beat phenomenon.
(4) Because VRLA battery belongs to the poor fluid type design, it has reserve channel for gas combination. If there is a "rich fluid" phenomenon, it will stop the spread of O2 to the cathode, reduce the recombination rate of O2, and the pressure inside the battery will enlarge.
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