What is the maximum discharge current of the battery
The specified battery discharge conditions are:
(1) The discharge current of the battery is generally the discharge rate
(2) The termination voltage and discharge current of the discharge are different, and the termination voltage is also different
(3) Discharge temperature: The discharge capacity of the battery is small at low temperatures and large at high temperatures. In order to unify the discharge capacity, the discharge temperature is specified.
The discharge rate refers to the magnitude of the battery discharge current, which is divided into time rate and current rate.
Discharge time rate refers to the length of time from discharge to termination voltage under certain discharge conditions. According to IEC standards, the discharge rates are respectively 20 hour rate (20Hr, the most conventional type, which is generally indicated on the battery), 10 hour rate (10Hr), 5 hour rate (5Hr), 3 hour rate (3Hr), 2 hour rate (2Hr), 1 hour rate (1Hr), 0.5 hour rate (0.5Hr), and so on.
The discharge current of a battery varies, and the capacity it can discharge varies. The larger the discharge current, the smaller the amount of electricity it can discharge.
In addition, the larger the discharge current, the shorter the battery life; The deeper the discharge depth, the shorter the battery life.
Lead acid batteries can cope with short periods of high current discharge, when the depth of discharge is not deep. Low current discharge, even if the discharge depth is slightly deeper, has little impact on the battery life. Most afraid of continuous high current discharge and deep discharge.
Maximum charging current 3A
As the battery discharges, both the positive and negative electrode plates are vulcanized, while the sulfuric acid in the electrolyte gradually decreases, while the water content increases, resulting in a decrease in the specific gravity of the electrolyte. In practical use, the discharge degree of the battery can be determined by measuring the specific gravity of the electrolyte. Under normal usage, lead batteries should not be excessively discharged, otherwise small lead sulfate crystals mixed with active substances will form a larger body, which not only increases the resistance of the electrode plate, but also makes it difficult to restore it during charging, directly affecting the capacity and life of the storage tank. The charging of lead acid batteries is an inverse process of discharge.
The principle equation for the chemical reaction between charge and discharge of lead-acid batteries is as follows:
Positive electrode: PbO2+2e -+SO42 -+4H+==PbSO4+2H2O
Negative electrode: Pb-2e+SO42 -==PbSO4
Cathode: PbSO4+2e -=Pb+SO42 -;
Anode: PbSO4+2H2O-2e -=PbO2+4H++SO42 -.
Total reaction: PbO2+2H2SO4+Pb==2PbSO4+2H2O (forward discharge, reverse charge)
(The reason why the mass of both positive and negative electrodes of a lead battery increases during discharge: When the lead battery discharges, there is PbSO4 attached to the positive electrode plate, resulting in an increase in mass: There is also PbSO4 attached to the negative electrode plate, resulting in an increase in mass.)
Lead acid electricity is generally divided into three categories; 1. Starting battery 2. Power battery 3. UPS battery. The maximum short time discharge current of starting battery can discharge more than 5 times its total capacity. "CCA" on the battery means this. If your 10 ampere hour battery is a motorcycle battery, it can discharge a current of more than 50 amperes. If it is the latter two types of batteries, the discharge current should be smaller. The charging current is one-tenth of its capacity, which is 1 ampere.
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