​In an acidic environment, the PE separator will accelerate its own aging as the temperature rises. After use, the PE separator has different degrees of grid indentation on the contact surface of the front plate. It is obvious that all parts of the separator are oxidized and damaged. It exists in the direction of the indentation, and the direction in which the separator is embrittled and falls off to form holes is the direction of the grid. The microstructure of the PE separator changed significantly before and after oxidation, and a large number of lead sulfate particles adhered to the inside and outside of the oxidized PE separator; the oxidation of the PE separator usually occurred in the direction of the positive plate, because the positive plate was charged during the charging process. During the process, the temperature of the electrode plate is continuously increased, and the temperature of the solution is also continuously increased.

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.

According to the different batteries, the requirements for the hydrophilic wettability of the separator are also different (eg: PE separator, PVC separator, PP separator, etc.) The wet-type charged battery requires that the separator of the battery has good re wettability, that is, after the first wetting, whether the separator is air dried or not, it is required to have another hydrophilic wettability.