Sc nimh batteries charging characteristics

Source: 2020 - 04 - 14 cometh hits: nickel metal hydride battery charging characteristics of the rated voltage for 1 of nimh batteries. 2 v, end of charging voltage of 1. 5v。 Discharging termination voltage general is 1. 1v。 Nimh batteries charging characteristics of the charging current, charging temperature and charging time close to the maximum, the influence of battery temperature rise faster, the easier it is to damage to the battery. 24 v / 10 ah nimh batteries charging characteristics under different charging rate is shown in figure 1. Figure 1 the charging characteristics of the initial charge under different charging rate charged state is 5%, '0. 5 c constant current charging 'full electric ( Charged state = 100%) Takes about 2 hours. Maximum voltage 29. 7, 4 v voltage change. 1v。 When the constant current charging more than 1 c, you need 1 hour or so to charge. Voltage change 8. 2 v, maximum voltage up to 30. 5 v, than allow charging termination voltage. , the charging rate is higher, the charging current, the greater the terminal voltage is higher, the greater the damage of the battery. 24 v / 10 ah nimh batteries in the initial state of charged 10%, constant current charging 0. 5 c, the terminal voltage change rate curve is shown in figure 2. Can be seen from the diagram, nickel metal hydride battery terminal voltage in the process of change can be divided into three stages. With the increase of charging time, more hydrogen atoms on the electrode surface by adsorption, make it difficult to be absorbed. Therefore, in the late stage of charging, impedance has a tendency to increase, rising rate of terminal voltage increase.