The advantages of using a PE separator with GM are...

The battery separator is an integral part of the battery. In the valve-regulated lead-acid battery, the battery separator can prevent the active material of the plate from falling off and the deformation of the plate, and prolong the service life of the battery. It is required that the battery separator shrinks less after the sulfuric acid is injected, and the battery separator is also required to be in a higher pressure state when the battery is designed. The resistance formed by the resistance of the battery separator and the contact of the electrode plate is a component of the internal resistance of the battery. The battery separator itself has a low resistivity, and the battery separator is also required to be in a high pressure state during battery design.

A 0.25mm thick glass fiber layer made of coarse glass fiber is pasted on both sides of the battery separator. The battery separator improves performance, prevents the battery separator from shrinking and loosening, and improves the ability to retain electrolyte. Since the battery separator has a protective effect on the performance of the lead battery, the main function is to prevent the short circuit of the positive and negative electrodes, but it cannot significantly increase the internal resistance of the battery. The battery separator should be porous, allow free diffusion of electrolyte and ion migration, and have relatively low electrical resistance. When some of the active material falls off, it must not pass through the pores to reach the opposite plate.

PE separator is a new type of separator after rubber separator, glass fiber separator and polyethylene (PVC) separator. It has the advantages of high porosity, small pore size, low resistance, good toughness and sealability. Prevent edge short circuit, reduce active material shedding, and improve battery life.

​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 quality of the separator will directly affect the capacity, charge-discharge cycle life and self-discharge performance of the battery. The analysis results of the battery show that the main reason for the low cycle life of the battery is that the diaphragm with poor quality has a relatively large pore size, and the pore size distribution and thickness are not uniform, so as the charging and discharging progress, the positive lead powder gradually penetrates a small amount The separator goes to the side of the negative electrode, and the negative lead dendrite may penetrate the separator and eventually cause a chronic short circuit of the battery.