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.