How does the battery detect the internal resistance

The internal resistance of the battery is not a fixed value. In order to reduce the internal resistance of the battery, the electrode grid is made porous, and the alloy ratio of the grid should be appropriate. The infusion of the separator and the battery installation process can affect the internal resistance of the battery. First of all, when charging, the internal resistance of the battery gradually decreases. The reason is: the lead sulfate on the two electrode plates becomes lead dioxide and velvet lead, respectively. The electrical conductivity of lead dioxide and velvet lead is better than that of lead sulfate. Many; the resistance of the electrolyte is called the contact resistance, which includes the electrolyte resistance between the plates and the electrolyte resistance in the pores of the plates. When the specific gravity is 1.200, the resistance of the electrolyte is the smallest. When charging, the concentration of sulfuric acid in the pores of the electrode plate increases, and the water decreases. Since sulfuric acid has much better conductivity than water, the internal resistance is reduced. Secondly, when discharging, the internal resistance of the battery gradually increases. The reason is that the specific gravity of the electrolyte decreases. During discharge, the concentration of sulfuric acid in the pores of the electrode plate decreases, and the water increases, so the internal resistance increases; lead sulfate is formed on the two electrode plates. Lead sulfate is a salt-like crystalline substance with poor conductivity, which increases the internal resistance. In addition, the electrolyte temperature also has a significant effect on the internal resistance of the battery. When the temperature increases, the viscosity of the electrolyte decreases, the mobility of molecules and ions increase, and the internal resistance decreases. Conversely, when the temperature decreases, the viscosity of the electrolyte increases, and the mobility of molecules and ions decreases, thereby increasing the internal resistance. Therefore, the internal resistance of the battery is not a fixed value. During the charging and discharging process, it changes with changes in the specific gravity, temperature, and active material on the electrode plate. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.