Lead-acid batteries are mainly composed of negative elemental lead, positive lead dioxide, electrolyte and separators. The PE separator is between the positive and negative plates of the battery, which can prevent the positive and negative plates from directly contacting and discharging to cause short circuit. At the same time, there are a certain amount of holes on the separator to ensure the passage of positive and negative ions and prevent open circuit. Therefore, the importance of the separator is no less than that of the positive and negative plates of the battery. At present, it is generally believed that the explosion accident caused by the short circuit of the lead-acid battery is mainly caused by the aging of the separator.

In order to prolong the cycle life of PE battery separator, it is necessary to ensure that the plate is always in a compressed state during the battery cycle. The separator of PE battery will shrink after the battery is filled with acid or the battery is dehydrated, and the contraction of the separator reduces the pressure between the plates, thus shortening the cycle life of the battery. The bonding force between superfine glass fibers in the separator of PE battery is very small. When the surface tension of water is greater than the bonding force between fibers, the bonding force between superfine glass fibers will be destroyed; The elasticity of the superfine glass fiber in the separator of PE battery is not good enough, so that it cannot be restored to its original state after being compressed.

1. Compared with many traditional separators, PE separator has the strongest oxidation resistance from the material point of view. However, due to its soft texture and thin base thickness, PE separator is deformed during battery charging and discharging, which is easy to cause heat loss and aggravate the thermal oxidation process of the separator.

PE battery separator has many effects on the performance of lead battery. Every improvement of separator quality is accompanied by the improvement of lead battery performance. The main function of PE battery separator is to prevent short circuit between positive and negative electrodes, but it cannot significantly increase the internal resistance of the battery. PE battery separator is mainly used to prevent short circuit between positive and negative electrodes, but it cannot significantly increase the internal resistance of the battery. Therefore, the separator should be porous, allowing free diffusion of electrolyte and ion migration, and has a relatively small resistance. PE battery separator shall not reach the opposite electrode plate through fine holes, that is, the hole diameter shall be small, the number of holes shall be large, and the total area of the gap shall be large.

The time required for the PvC separator, PE separator, rubber separator, and PP separator to achieve stable resistance is different. This is mainly due to the different main materials used for the separator, and the different time it takes for the separator to be completely wetted by the sulfuric acid solution. Different ratios and apertures, the PP separator takes the shortest time to stabilize the resistance, the PE separator takes the longest time, the PVC separator and the rubber separator are in the middle, and the PVC separator takes a slightly shorter time than the rubber separator.