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Ni-MH battery composition and characteristics

by:dcfpower     2021-03-01
u003cpu003e At present, domestic backup power sources for mining are mainly lead-acid batteries. However, because lead-acid batteries produce toxic substances such as waste liquid, exhaust gas, lead, and cadmium during use, it is more harmful to use in a relatively closed environment underground. Therefore, it is the current trend to choose more environmentally friendly Ni-MH batteries. The nickel-hydrogen battery produces hydrogen and oxygen in the process of charging and discharging. Under the catalysis of the hydrogen storage alloy, it can also consume part of the hydrogen and oxygen to achieve pressure resistance. When the pressure is too high, it can be eliminated through the safety valve without any pollution to the outside world. At the same time, the self-discharge of NiMH batteries is relatively low, which greatly increases the number of battery charge and discharge cycles. However, for nickel-hydrogen battery packs, if the cells cannot be controlled, it will cause serious damage to the service life and efficiency of the nickel-hydrogen battery. Therefore, higher requirements are placed on the battery management system. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003eu003cpu003e Generally, the nickel-hydrogen battery adopts a cylindrical structure. The battery shell is a nickel-plated steel cylinder and also serves as a negative electrode. The battery cap is the positive terminal and is equipped with safety Exhaust valve device. The active material of the positive electrode of the battery is NiOOH (when discharging) and Ni(OH)2 (when charging), the active material of the negative plate is H2 (when discharging) and H2O (when charging), and the electrolyte uses 30% potassium hydroxide solution . In the mine backup battery system, using 10 or 20 series connection, the voltage can reach 12V or 24V. u003c/pu003eu003cpu003eFigure 1 Standard charge-discharge curve of Ni-MH battery pack (20)u003c/pu003eu003cpu003eNi-MH batteries mainly have the following characteristics: ①The lower the external temperature, the higher the voltage maintained after the Ni-MH battery is fully charged. high. Conversely, the lower the voltage. ②The higher the charging current, the faster the temperature of the Ni-MH battery will heat up. ③After the battery is fully charged, continue to charge, but the battery voltage drops. u003c/pu003eu003cpu003e④Long idle time, it will consume internal power. The normal charge and discharge characteristic curve of Ni-MH battery is shown in Figure 1. u003c/pu003eu003c/pu003eu003c/pu003e
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