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Comparison of lithium battery and nickel hydrogen battery
- Sep 08, 2018 -

Comparison of lithium battery and nickel hydrogen battery

The comparison between lithium batteries and nickel-metal hydride batteries is that lithium batteries are suitable for use on products with small current consumption (such as mobile phones), but if they are used in products with large current consumption (such as digital cameras), the demand for current is large. And the power consumption is much larger than that of the mobile phone. The lithium battery is in short supply, so it is better to use the nickel-hydrogen battery with larger current, larger capacity, higher energy density and larger power output.

Comparison of advantages and defects

lithium battery

Advantages: There is no memory effect (refers to if the battery is a nickel-cadmium battery, long-term non-charging, discharging, easy to leave traces in the battery, reduce the battery capacity phenomenon. Another explanation is: the battery seems to remember the user daily The charging and discharging amplitude and mode are difficult to change this mode for a long time, and can not be charged or discharged greatly.), light weight.

Defects: High cost, low current, and not full charge (compared to NiMH batteries).

NiMH batteries

Advantages: The price is cheap, the versatility is strong, the current is large, the environment is not polluted, and the stability is good.

Defects: Heavy weight and short battery life.

Comparison of charging modes

The design of the NiMH battery charger and the lithium battery charger are based on voltage in principle, and the charging scheme for the design with or without memory effect is different.

In terms of voltage, the nickel-metal hydride battery charger charging termination voltage is generally set to 1.4V, and some chargers can also extend up or down a little. Depending on the condition of the battery, if the battery discharge is lower than 1.1V, there is no possibility of charging. The highest 1.4V is the upper limit that cannot be broken under normal circumstances. For nickel-metal hydride batteries, the discharge at 1.1V is of little significance because capacity is not available for replenishment during charging. Lithium battery chargers are generally produced one-to-one, that is, single-cell lithium batteries are designed with rated voltages of 3.6V~3.7V and charge termination voltages of 4.1V~4.2V. Different series and parallel connections, lithium battery pack design The voltage is not very similar.

In use, since the internal structure of the lithium battery and the nickel-hydrogen battery are different, the constituent material of the lithium battery is an active material, and thus there is no memory effect, and should not be overcharged. Nickel-metal hydride batteries are different. After a certain period of circulation, the electrolyte will crystallize and prevent the charger from charging. This is why the memory effect begins to take effect. The correct way is to activate, activate and divide into two kinds, one is the complete charge and discharge in the case of capacity loss, the second is that after the capacity loss occurs, if the capacity loss is more than 1/10, this is nearly impossible to use. At this time, 1.5 times of the charging time can be used to activate the internal crystallized material, thereby restarting the nickel-hydrogen battery. Accordingly, the charging process is accompanied by an increase in voltage, and the termination voltage of the nickel-hydrogen battery charger is designed to be 1.4V. This 1.5-times charge is ready for charging.

Some chargers now also provide a charging protection method that effectively protects the battery depending on whether the battery is fully charged or not. Lithium-ion batteries can be used with the charge, and have little effect on the life. For batteries with a power meter such as PPC, it is recommended to use the battery after charging to avoid the impact. It can be charged at any time and can be disconnected with time. If it is fully charged and continues to charge, it will affect the battery life.

First, the battery must be completely discharged, it must be discharged for about 24 hours, and then fully discharged, then fully charged, so that multiple cycles, that is, restore the battery capacity, and avoid battery overcharge, unless the battery has been damaged. However, to avoid the best method of this phenomenon, it is still recommended to choose a nickel-metal hydride battery or a lithium battery.