Functions and requirements of battery separator

The battery separator is an important component of the battery and is not an active substance. In some cases it even plays a decisive role. The material itself is an electronic insulator, and its porosity makes it ionically conductive. The resistance of the separator is an important performance of the separator, which is determined by the thickness of the separator, the porosity, and the degree of tortuosity of the hole, and has an important influence on the capacity and terminal voltage level of the high-rate discharge of the battery; The stability of the separator in sulfuric acid directly affects the life of the battery; The elasticity of the separator can delay the shedding of the positive active material; the pore size of the separator affects the short-circuit degree of lead dendrites. 

Due to the various effects of the separator on the performance of the lead-acid battery, every improvement in the quality of the separator is accompanied by the improvement of the performance of the lead-acid battery. The main function of the separator is to prevent the short circuit of the positive and negative electrodes, but it cannot significantly increase the internal resistance of the battery. Therefore, the battery separator should be porous, allow free diffusion of electrolyte and ion migration, and have relatively low electrical resistance. When the active material falls off, it must not pass through the pores to reach the opposite plate, that is, the aperture should be small, the number of holes should be large, and the total area of the gap should be large; in addition, good mechanical strength, acid corrosion resistance, oxidation resistance, and No substances harmful to the plate are precipitated.

  The battery separator should generally have the following requirements in the battery:   

• I. Prevent the positive and negative electrode plates from contacting each other and cause the internal short circuit of the battery; 

• II. Make the battery assembly tight and reduce the battery volume;

• III. Prevent the plate from being deformed, bent and the active material falling off; 

• IV. Store a necessary amount of electrolyte in the porous separator between the plates to ensure high conductivity and battery reaction requirements; 

• V. Prevent some substances harmful to the electrode from migrating and diffusing through the separator.

Want to view more products? Click here!

--End--