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Do you know the charge and discharge of NI-MH Battery?

Jan. 02, 2020

The high-end NI-MH charger uses -DELTA V to detect the battery voltage to determine whether the battery is fully charged. The voltage curve of the NI-MH Battery during charging is a bit similar to that during discharging. The voltage rises quickly at the beginning, and then slowly rises. When the battery is fully charged, the voltage begins to decrease rapidly, but the magnitude of the decrease is not large. The previous commonly used Ni-Cd Battery is also similar, except that the speed and amplitude of the decline are larger than that of NI-MH. The most chargers on the market (the cheaper ones) often use constant voltage charging. For example, the old GP charger is 1.4V constant voltage, which means that when the battery rushes to 1.4V, there is no voltage difference, and the charging ends. 

NI-MH Battery

NI-MH Battery

As a result, the battery cannot be fully charged, especially some older batteries. Due to the increased internal resistance, the voltage actually applied to the battery is lower. Moreover, the current of such a charger is often small, and the charging often takes more than 10 hours. And -DELTA V automatically cut off the charger, because it can accurately control the charging time, so it can more reliably use high current charging. The damage of high-current charging to nickel-metal hydride batteries does not have the benefits that everyone imagines. On the contrary, the current use of DC requires more high-current charging. The first is the issue of time. Then, the nickel-metal hydride battery has a characteristic that the larger the current you charge, the larger the current it can discharge. Now DC is an electric tiger, and the current is not small, so it is relatively large to use. Charging with current is a smart choice to keep the battery cleaner. Generally, the charging current of No. 5 cannot exceed 1.5C. C is the battery capacity, which is a 1000MAH battery. Do not exceed 1.5A. I generally use 0.5C for charging (my charger has adjustable current). In terms of discharge, under normal circumstances, it is enough to charge the DC after the black screen, and the NI-MH memory effect is very small. However, after a period of use, and when you want to balance and activate the battery, you need to control the termination voltage of the battery discharge. The termination voltage of NI-MH batteries is 0.9V. Be careful not to over-discharge when discharging. You can stop discharging when you put 0.9V into each battery. NI-MH batteries are not as powerful as nickel-cadmium batteries and are sensitive to overcharge and over-discharge as well as high temperatures. Charge and discharge temperature. Generally, do not let the battery temperature exceed 45 degrees. When the battery is fully charged, the battery will heat up. When the large current is full, the temperature should be about 42 degrees, not more than 45 degrees, otherwise the life will soon decrease and the internal resistance of the battery will increase. In addition, the battery temperature is high after charging, it can be charged after cooling down, and the battery must be cooled after charging. After a long period of non-use, it is best to recharge the battery a few times. When using it, pay attention to keeping the packaging skin intact and not damaged, so as to avoid short circuit. Do not beat the battery, do not burn, etc. We are Ni-MH Battery Pack Supplier, welcome to consult.

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