Battery internal resistance is through what to test?

Battery in our country more and more frequently used for battery qualified sex is a matter of concern to people, the most should not be neglected is the battery internal resistance, battery internal circuit composed of electrolyte, and there are some in the electrolyte resistance, sheeting and active material also has certain resistance, especially the resistance being very high, spacer all these resistors is the sum of battery internal resistance.

Battery internal resistance, is not a fixed value. In order to reduce the internal resistance of battery, will be made of the porous plate plate grid, grid alloy ratio should be appropriate. Spacer pickling and battery installation process can affect battery internal resistance.

First of all, when charging, battery internal resistance decreases, the reason is: the plates on the lead sulfate were turned into lead dioxide, and wool lead, lead dioxide and velvet the conductive performance of lead, much better than the lead sulfate; Electrolyte resistance as contact resistance, including electrolyte resistance between the plate and plate within the pores of the electrolyte resistance. When the specific gravity of 1.200 the resistance of the electrolyte is minimal. When charging, plate pores increases, sulfuric acid concentration in the water. Due to sulfate conductive performance is better than water, so the lower internal resistance.

Second, discharge, battery internal resistance increases gradually, the reason is: the electrolyte density lowered. Discharge, the plate in the pores reducing sulphuric acid concentration, more water, so the internal resistance increases; The lead sulfate is formed on the plates. Lead sulfate is a kind of poor conductivity of salt crystal material, make internal resistance increases.

In addition, the electrolyte temperature on the battery internal resistance has significant influence. When the temperature rises, the electrolyte viscosity decreased, the activity of the molecules and ions is enhanced, the internal resistance decrease. On the other hand, the temperature falls, the electrolyte viscosity increases, molecules and ions activity is abate, so that the internal resistance increases. Battery internal resistance is not a fixed value, therefore, in the process of charging and discharging, as the proportion of electrolyte, temperature, and the fluctuations of the active material on the plate.