Acid absorption saturation of battery separator in battery
The battery separator has a small pore size and high porosity, which is easy to retain the electrolyte, has a good liquid absorption rate and a fast penetration rate, and can effectively enhance the retention of active substances and prolong the battery life. The battery separator can stably supply electrolyte to the pole plate and keep the ion conduction smooth. The strong liquid transfer ability can effectively prevent the phenomenon of acid stratification in the battery. The glass fiber is mainly used, and a certain amount of organic fibers are mixed to enhance the tensile strength of the separator and optimize other performance indicators. The battery separator acts as the carrier of the sulfuric acid electrolyte in the battery, and shares with the electrode plate all the sulfuric acid required to absorb the rated capacity of the battery in the state of poor liquid.
The battery separator should be porous to allow electrolyte penetration, and should have good acid and alkali resistance. The battery separator materials include wood, microporous rubber, microporous plastic and resin-impregnated paper, etc., and the microporous plastic separator is made into a bag, which is tightly wrapped outside the positive plate to prevent the active material from falling off. In order to improve the sealing reaction efficiency of valve-regulated lead-acid batteries, the battery separator can provide enough oxygen channels when the battery is charging, so that the oxygen separated from the positive plate can pass through the separator to the negative plate smoothly, so as to be converted into water and realize oxygen circulation.
The battery separator has a reasonable microporous structure, and it is also required to determine the appropriate acid absorption saturation of the separator when designing the battery. In valve-regulated lead-acid batteries, the separator has the function of preventing the active material of the electrode plate from falling off and the deformation of the electrode plate, which will prolong the service life of the battery. The battery separator is required to be under a higher pressure state when the battery is designed. The resistance and the resistance formed at the contact with the electrode plate are part of the internal resistance of the battery, which requires the battery separator to have a low resistivity.
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