The temperature of the electrolyte has a great influence on the capacity value that the lead-acid battery can supply under a certain discharge rate and termination voltage condition F. The temperature of the electrolyte increases, the discharge capacity increases, the temperature decreases, and the discharge capacity decrease. The decrease in battery capacity with decreasing temperature is closely related to the severe effect of temperature on electrolyte viscosity and resistance. When the temperature is low, the viscosity of the electrolyte increases, the ion movement is subject to a largely positive force, the dispersion capacity of the electrolyte decreases, and the concentration polarization increases sharply: at the same time, when the temperature is low, the ohmic resistance of the electrolyte also increases, resulting in electrochemical changes. and ohmic polarization also increases, and the capacity similarly decreases.

    In addition, when the temperature is low, the saturation of lead sulfate in the electrolyte also decreases, which will inevitably lead to an increase in the supersaturation of lead ions (Pb2+) near the electrode plate, forming a dense layer of lead sulfate, which hinders the active material and the electrolyte. Contact will also cause the battery capacity to decrease.

    Negative plates are more sensitive to temperature than iE plates. This also shows that in order to improve the low temperature or high current discharge performance of the battery, battery manufacturers usually only add corresponding additives to the negative electrode lead paste. The second is the decrease in discharge capacity caused by the decrease in the temperature of the electrolyte, which does not mean that the battery has lost a part of its capacity because as long as the battery is heated to increase the temperature of the electrolyte, the lead-acid battery can still discharge its rated discharge capacity.