First, let’s take a brief look at NiMH batteries
1.Memory effect of NiMH battery
NiMH batteries have the same memory effect as Ni-Cd batteries, but are much smaller than Ni-Cd batteries. Therefore, it is not necessary to perform a discharge operation every time it is charged (because improper operation will damage the battery), it only takes three months to fully charge and discharge to alleviate the memory effect.
⒉The self-discharge rate of NiMH battery
NiMH batteries are 25 to 35% /month, nickel-cadmium batteries are 15 to 30% /month, and lithium batteries are 2 to 5% (months). The self-discharge rate of NiMH battery is the largest, while the discharge rate of lithium battery is extremely low compared with the other two types of batteries.
⒊Charging method of NiMH battery
Neither NiMH batteries nor lithium batteries can withstand overcharge. Therefore, the PICKCUT control method of constant current charging for NiMH batteries is the best charging method to stop charging when the charging voltage reaches the highest. For lithium batteries, it is best to use constant current and constant voltage charging methods. If the nickel-cadmium battery charger-DV control method is used for charging, it will affect the service life of the nickel-metal hydride battery and the lithium battery.
⒋The higher the capacity of NiMH battery, the better
Different types of batteries, the higher the capacity, the longer the use time. Regardless of the volume and weight factors, of course, the higher the capacity, the better.
But for the same battery model, the nominal capacity (such as 1600mAh nimh battery) is also the same, and the actual measured initial capacity is different: for example, one is 1660mAh and the other is 1605mAh, so is the 1660mAh battery better than the 1605mAh battery.
NiMH battery charging method
Scientific charging method can extend the life of NiMH battery.
①Under normal circumstances, a new NiMH battery has only a small amount of power, and it must be charged before use.
However, if the battery leaves the factory for a short time and has sufficient power, it is recommended to use it before charging. New nickel-metal hydride batteries generally need to be charged and used 3-4 times before their performance can reach their best state.
②Although the memory effect of NiMH batteries is small, it is best to recharge them after each use, and to charge them all at once. Do not charge them for a while and then use them again. This is an important point of “extending one’s life”.
③When charging, pay attention to the heat dissipation around the charger. Keep the battery clean when not in use, especially the contacts at both ends, and wipe gently with a soft dry cloth if necessary. If it is not used for a long time, take the battery out of the battery compartment and place it in a dry environment.
④ NiMH batteries will enter a “sleep” state after being stored for a few months, and the battery life will be greatly reduced. If the NiMH battery has been stored for a long time, it is recommended to charge it with a slow charge first. Generally, the voltage of the NiMH battery is below 1.2V before charging, and the normal voltage is about 1.4V after being fully charged. This can be used to determine whether the battery is fully charged.
The battery is a chemical “power source” widely used in the world. It has the advantages of stable voltage, safe and reliable, low price, wide application range, abundant raw materials and high recycling rate. It is the world’s largest battery and the most useful battery.
The development of science and technology, the improvement of the quality of human life, the crisis of petroleum resources, and the deteriorating ecological environment of the earth have formed a dual social background of rapid development of technology and industry in the field of new secondary batteries and related materials. The urgent need of the market has led to the emergence of new secondary batteries. Among them, high-energy nickel-cadmium batteries, nickel metal hydride batteries, nickel-zinc batteries, maintenance-free lead-acid batteries, lead cloth batteries, lithium ion batteries, lithium polymer batteries and other new secondary batteries are favored and widely used in various countries , Forming an industry and developing rapidly.
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