Why does the Shuangdeng battery experience bulging phenomenon

The double decker batteries we use may develop bulges over time, while others may not. Regardless of the type of battery, bulging is a common occurrence, including lead-acid batteries used in our UPS and EPS power products. Drum packs have a significant impact on the use of batteries and can even pose a risk of explosion.
The bulging of lead-acid batteries is mainly caused by an increase in internal pressure, which is mainly due to the following reasons:
(1) The opening pressure of the safety valve is too high, or the safety valve is blocked. When the internal pressure increases to a certain level, the valve cannot open normally, which will inevitably cause bulging and deformation.
(2) The float charging voltage is set too high and the charging current is high, which accelerates the precipitation of O2 on the positive electrode plate and leaves no time for it to recombine at the negative electrode. At the same time, the temperature inside the battery rises rapidly, causing bulging and deformation of the VRLA battery when the exhaust is too late and the pressure reaches a certain level.
(3) During the charging operation of double decker batteries, especially in series connected battery packs, if the battery pack is overcharged, poor quality batteries often exhibit internal gas recombination and other phenomena, resulting in bulging.
(4) Due to the lean liquid design of the Shuangdeng battery, there is a reserved pathway for the combination of gases. If there is a "rich liquid" phenomenon, it will block the diffusion of generated O2 to the negative electrode, reduce the recombination rate of O2, and increase the internal pressure.
In the process of our use, if we find that the double entry battery has bulging phenomenon, we should replace the bulging battery to avoid affecting the use of other batteries or the use of the entire device. Shuangdeng Battery