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Ni-MH Battery Introduction

(Summary description)Ni-MH Battery Introduction

Ni-MH Battery Introduction

(Summary description)Ni-MH Battery Introduction


Ni-MH batteries introduction of six characteristics. Nickel-metal hydride batteries are known as the most environmentally friendly batteries because it contains low environmental pollution components. Compared with lithium batteries, nickel-metal hydride batteries have higher memory effects and higher self-discharge rates.


Ni-MH batteries are made of hydrogen ions and metallic nickel. They have 30% more power reserve than nickel-cadmium batteries, lighter, have a longer service life, and are environmentally friendly. The disadvantage of Ni-MH batteries is that they are much more expensive than nickel-cadmium batteries and their performance is worse than lithium batteries. The metal part of a nickel-metal hydride battery is actually a metal hydride.


 Sixe Characteristics


1. Charging characteristics: When the charging current of the Ni-MH battery increases and / or the charging temperature decreases, the charging voltage of the battery will rise. Generally, a constant current charge of not more than 1C is used at an ambient temperature between 0 ° C and 40 ° C, and a higher charging efficiency can be obtained by charging between 10 ° C and 30 ° C.

If the battery is often charged in a high or low temperature environment, it will cause the performance of the power battery to decrease. For fast charging above 0.3C, charging control measures are essential. Repeated overcharge will also reduce the performance of the battery, so protection measures for high and low temperature and high current charging must be in place.


2. Discharge characteristics: The discharge platform of a Ni-MH battery is 1.2V. The larger the current, the lower the temperature. The discharge voltage and discharge efficiency of the battery will decrease. The maximum continuous discharge current of the battery is 3C.

The discharge cut-off voltage of the battery is generally set to 0.9V, and the IEC standard charge and discharge mode is set to 1.0V, because generally less than 1.0V can also provide a stable current, and less than 0.9V can also provide a slightly smaller current, so The discharge cut-off voltage of nickel-metal hydride batteries can be regarded as a voltage range from 0.9V to 1.0V, and some batteries can be subscripted to 0.8V. In general, if the cut-off voltage is set too high, the battery capacity cannot be fully utilized, otherwise, it may easily cause the battery to over-discharge.


3. Self-discharge characteristics: refers to the phenomenon of capacity loss when the battery is stored in an open circuit. The self-discharge characteristics are mainly affected by the ambient temperature. The higher the temperature, the greater the capacity loss after the battery is stored.


4. Long-term storage characteristics: mainly refers to the capacity of nickel-metal hydride battery recovery. When stored for a long time (such as one year), the capacity of the battery may be smaller than the capacity before storage, but after several charge and discharge cycles, the battery can return to the capacity before storage.


5. Cycle life characteristics: The cycle life of nickel-metal hydride batteries is affected by the charging and discharging system, temperature and usage methods. When charging and discharging according to the IEC standard, one full charge and discharge is the charge cycle of a nickel-metal hydride battery. Multiple charge cycles constitute a cycle life, and the charge-discharge cycle of a nickel-metal hydride battery can exceed 500 times.


6. Safety: The safety performance of nickel-metal hydride batteries is better in battery design. Of course, this is related to the materials and materials used, and it is inseparable from its structure. During use, if the battery is improperly used to cause overcharge, overdischarge, or short circuit, which will increase the internal pressure of the battery, a recoverable safety valve will open, which can reduce the internal pressure and prevent The effect of battery explosion.



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