The pressure state of the battery separator in use

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.

The battery separator can prevent antimony ions dissolved in the alloy of the positive plate grid frame from migrating to the surface of the negative plate, thereby reducing the self-discharge of the battery. A container that holds plates, separators and electrolytes, and its volume determines the capacity of the battery under certain conditions. The resistance of the battery separator and the resistance formed in contact with the electrode plate are part of the internal resistance of the battery, which requires the battery separator itself to have a low resistivity, and also requires the battery separator to be in a high pressure state in the battery design. Therefore, the battery separator is in close contact with the electrode plate, and the resistance formed at the contact is reduced.

The battery separator is usually installed with grooves on one side, and the groove surface should face the positive plate and be perpendicular to the bottom, so as to facilitate the circulation of electrolyte, the sinking of shedding active substances and the escape of air bubbles. The battery separator has the conditions of less impurities, good acid resistance and high mechanical strength. Battery separators are electronic insulators, and their porosity makes them ionically conductive. The battery separator shrinks a little after the sulfuric acid is injected, and it is also required that the battery is designed so that the separator is under a higher pressure state. The battery separator is in close contact with the pole plate, reducing the resistance formed at the contact point.

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