Comparison between lithium batteries and nickel-metal hydride batteries

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

Comparison of scope of use

The comparison between lithium batteries and nickel-metal hydride batteries is that lithium batteries are more suitable for use in products with low power flow(such as mobile phones), but if they are used in products with high power flow(such as digital cameras), due to the demand for power flow. Larger, Moreover, the power consumption is also much larger than that of mobile phones. Lithium batteries are in short supply, so nickel-metal hydride batteries with large power flow, large capacity, large energy density, and large power output will be better used.

The contrast between advantages and defects

lithium cell

Advantages: There is no memory effect(referring to the fact that if the battery is a nickel-cadmium battery, it does not charge or discharge for a long time, and it is easy to leave traces in the battery and reduce the battery capacity. Another explanation is that the battery seems to remember the user's daily charge and discharge amplitude and pattern, and it is difficult to change this pattern over time and can not be charged or discharged significantly. ), light weight.

Defects: High cost, low electrical flow, intolerably high(compared to nickel-metal hydride batteries).

Nickel hydride batteries

Advantages: Cheap price, good versatility, high power flow, environmental protection and no pollution, good stability.

Defect: Large weight, short battery life.

Comparison of charging patterns

The design of nickel-metal hydride battery charger and lithium battery charger is based on voltage in principle, and the charging scheme for the design of memory effect is also different.

In terms of voltage, the charging termination voltage of a nickel-metal hydride battery charger is generally set to 1.4 V, and some chargers can also be extended up or down. According to the condition of the battery, if the battery discharge is less than 1.1 V, it may not be charged. The highest 1.4 V is the upper limit that can not be broken under normal circumstances. For nickel-metal hydride batteries, discharge at 1.1 V is of little significance because capacity can not be supplemented when charging. Lithium battery chargers are generally one-to-one production, that is to say, a single lithium battery is designed with a rated voltage of 3.6 V to 3.7 V and a charging termination voltage of 4.1 V to 4.2 V. Different tandem and parallel conditions, lithium battery design Voltage is not similar.

In use, due to the difference in the internal structure of the lithium battery and the nickel-metal hydride battery, the composition material of the lithium battery is an active substance, so there is no memory effect and it must not be overcharged. The nickel-metal hydride battery is different. After a long period of cycle, the electrolyte will crystallize and prevent the charger from filling the electricity. This is the effect of memory. The correct approach is to activate and activate two types, one is to completely charge and discharge without loss of capacity, and the second is to if the capacity loss occurs, if the capacity loss is more than 1/10, this is close to unusable. At this point, 1.5 times the charging time can be used to activate the substance that has crystallized inside of it, so that the nickel-metal hydride battery can be restarted. Correspondingly, the charging process is also accompanied by an increase in the voltage. The termination voltage of the nickel-metal hydride battery charger is designed to be 1.4 V for this 1.5 times. The charging conditions are prepared.

Nowadays, some chargers also provide charging protection, depending on whether the battery's power is full of conditioning charging mode, can effectively protect the battery. Lithium-ion batteries can be used with charging, and the impact on life is not great. For batteries such as PPC, it is recommended to charge after no power to avoid the impact. It can be charged at any time and can be broken with time. If it is full of electricity, 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 NiMH battery or a lithium battery.

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