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Comparison of lithium batteries and nickel-metal hydride batteries

by:dcfpower     2021-03-19

The current comparison between lithium batteries and nickel-metal hydride batteries is mainly as follows:

Comparison of range of use

The comparison between lithium batteries and nickel-metal hydride batteries is that lithium batteries are It is more suitable to use on products with small current (such as mobile phones), but if it is used on products with high current (such as digital cameras), because the demand for current is large, and the power consumption is much larger than that of mobile phones, lithium batteries Supply exceeds demand, so it is better to use Ni-MH batteries with large current, large capacity, high energy density, and large power output.

Comparison of advantages and defects

Advantages: There is no memory effect (refers to if the battery is a nickel-cadmium battery, it is easy to leave traces in the battery and reduce the battery capacity if it is not charged or discharged for a long time. Another explanation is that the battery seems to memorize the user’s daily charge and discharge range and mode. It is difficult to change this mode over time and cannot be charged or discharged significantly.), light weight.

Defects: The cost is high, the current is not large, and it is not resistant to over-saturation (compared to Ni-MH batteries).

Ni-MH battery

Advantages: Low price, strong versatility, large current, environmental protection, no pollution, and good stability.

Defects: Heavy weight and short battery life.

Comparison of charging modes

The design of the Ni-MH battery charger and the lithium battery pack charger is based on voltage in principle, and the charging scheme for the design with or without the memory effect is also different.

In terms of voltage, the charge termination voltage of Ni-MH battery chargers is generally set to 1.4V, and some chargers can also extend up or down a bit. According to the condition of the battery, if the battery is discharged below 1.1V, it may not be charged. Electricity is possible, the highest 1.4V is the upper limit that cannot be broken under normal circumstances. For Ni-MH batteries, discharging at 1.1V is of little significance, because the capacity cannot be supplemented during charging. chargers are generally produced one-to-one, that is to say, a single-cell lithium battery pack is designed with a rated voltage of 3.6V~3.7V and a charging termination voltage of 4.1V~4.2V. Different series and parallel situations, lithium battery pack pack design The voltages are not very similar.

In use, because the internal structure of lithium batteries is different from that of nickel-hydrogen batteries, the constituent materials of lithium batteries are active materials, so there is no memory effect, so avoid overcharging. The nickel-hydrogen battery is different. After a long period of time, the electrolyte will crystallize and prevent the charger from fully charging. This is when the memory effect begins to take effect. The correct way is to activate. There are two types of activation. One is full charge and discharge without capacity loss. The second is after capacity loss occurs. If the capacity loss is more than 1/10, this is almost unusable. At this time, 1.5 times the charging time can be used to activate the already crystallized substances inside, thereby restarting the nickel-metal hydride battery. Correspondingly, the charging process is accompanied by an increase in voltage. The termination voltage of the nickel-metal hydride battery charger is designed to be 1.4V. This 1.5 times the charging time prepares the conditions.

Now some chargers also provide a charging protection method, which will adjust the charging mode according to whether the battery is full or not, which can effectively protect the battery. Lithium-ion batteries can be charged as they are used, and have little impact on life. For PPC and other batteries with fuel gauges, it is recommended to charge them after they are discharged to avoid impact. It can be charged at any time and can be disconnected at any time. If the battery is fully charged, the battery life will be affected.

First of all, the battery must be fully discharged. It must be discharged for about 24 hours. After it is fully discharged, fully charge it again. Such multiple cycles will restore the battery capacity and avoid overcharging the battery unless the battery is damaged. . However, to avoid the best way to avoid this phenomenon, it is still recommended that you choose nickel-metal hydride batteries or lithium batteries.

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