Performance characteristics of nickel hydrogen battery

　　1. Charging and discharging characteristics of Ni MH battery

　　(1) Charging characteristics of Ni MH battery The charging curve of H-Wi battery is similar to that of Cd Ni battery, but the charging voltage of basic Ni battery is lower than that of C-vi battery in the later stage of charging (Fig. 1-5 (a)). Temperature and charging rate have obvious effects on the charging voltage. High temperature leads to low charging voltage (see Figure 1-5 (b)); The charging rate is fast and the charging voltage is high (see Fig. 1-5 (c)).

　　Charging characteristic diagram of nickel hydrogen battery

　　(a) Comparing the charging process of Ni MH battery and Cd Ni battery, the charging current is 1C, 20 ℃;

　　(b) Charging curve at different temperatures, charging current: 0.3C;

　　(c) Charging curve under different charging current, 20 ℃;

　　(2) Discharge characteristics of ni mh battery

　　The discharge voltage of MH Ni battery is similar to that of cd Ni battery, but the discharge capacity is almost twice that of Cd Ni battery. The capacity and voltage of the battery during discharge are related to the service conditions, such as discharge rate, ambient temperature, etc. In general, the larger the discharge rate, the lower the discharge capacity and discharge voltage. As shown in Figure 1-6.

　　When designing the MH Ni battery, the capacity design is limited by the positive pole, and the negative pole capacity is excessive to ensure the composite reaction of O2 generated by the positive pole to the negative pole during charging, eliminate the oxygen pressure, achieve battery sealing, and ensure the safety of the battery. In order to achieve the quality and nominal capacity of the battery, and reasonably and effectively use the internal space of the battery, the positive and negative electrodes must have a certain specific capacity, that is, mass specific capacity and volume specific capacity. For AA type batteries, it is generally required that the negative electrode capacity is greater than 1500mAh and the positive electrode capacity is greater than 1050mAh. In order to achieve this target, it is required that the composition of the negative electrode hydrogen storage material is reasonable, the specific energy is high, and the assembly process is good.

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