(1) Effect of discharge rate on battery capacity
The lead battery capacity decreases with the increase of the discharge rate, that is to say, the larger the discharge current, the smaller the battery capacity is calculated. For example, a 10Ah battery can be discharged for 2 hours with 5A discharge, ie 5×2=10 Then, with 10A discharge, only 47.4 minutes of electricity can be released, which is 0.79 hours. Its capacity is only 10×0.79=7.9 ampere. So for a given battery to discharge at different times, there will be different capacity. We are talking about When you reach capacity, you must know the rate or rate of discharge. Simply put, how much current is used to discharge.
(2) Effect of temperature on battery capacity
Temperature has a great influence on the capacity of lead-acid batteries. Generally, the temperature decreases with the bottom, the capacity decreases, and the relationship between capacity and temperature is as follows:
Ct1= Ct2/1+k(t1-t2).t1t2 is the temperature of the electrolyte, k is the temperature coefficient of capacity, Ct1 is the capacity (Ah) when t1, and Ct2 is the capacity (Ah) when the temperature is t2. In the battery production standard, it is generally required to set a temperature to the rated standard temperature. For example, t1 is the actual temperature, t2 is the standard temperature, (generally 25 degrees Celsius). The negative plate is more sensitive to the low temperature than the positive plate. When the electrolyte temperature is lowered When the viscosity of the electrolyte increases, the ions are subjected to a large resistance, the diffusion capacity is decreased, the electrolyte resistance is also increased, the electrochemical reaction resistance is increased, and a part of the lead sulfate cannot be normally converted. The charge acceptance is decreased, resulting in a decrease in the battery capacity. .
(3) The effect of termination voltage on battery capacity
When the battery is discharged to a certain voltage value, the voltage drops sharply. In fact, the energy obtained is very small. If the battery is deeply discharged for a long time, the damage to the battery is quite large. Therefore, the discharge must be terminated at a certain voltage value. Calling the discharge termination voltage. Setting the discharge termination voltage is of great significance for prolonging the battery life. Generally, the electric vehicle battery that we are repairing has a discharge termination voltage of 1.75 volts per grid, which means that a 12 volt battery is 6 grid, its discharge termination voltage is 6 × 1.75 = 10.5 volts.
(4) The influence of the geometry of the plate on the battery capacity
When the amount of active material is constant, the geometric area of ​​the plate directly contacting the electrolyte increases, and the battery capacity increases, so the geometrical size of the plate and the influence on the battery capacity cannot be ignored.
1 plate thickness on the capacity
The amount of active material is constant, the battery capacity decreases with the increase of the thickness of the plate, and the thicker the plate, the smaller the contact surface of sulfuric acid with the active material, the lower the utilization rate of the active material, and the smaller the battery capacity.
2 plate height impact on capacity
In the battery, there is a big difference in the utilization ratio of the active materials in the upper and lower parts of the plate. Experiments have confirmed that in the initial stage of discharge, the current density on the upper part of the plate is about 2 times to 2.5 times higher than that in the lower part. The change in discharge is gradually reduced, but the upper portion is larger than the lower current density.
3 plate area impact on capacity
The amount of active material is certain, the larger the geometrical area of ​​the plate, the higher the utilization rate of the active material, and the larger the capacity of the battery. In the case of the same battery case and the same active material quality, the plate is increased by using a thin plate. The number, that is, increases the effective reaction area of ​​the plate, thereby increasing the utilization rate of the active material and increasing the capacity of the battery.
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