Common terminology of Lithium-ion battery (3)

Over discharge
In the process of discharge, if the battery exceeds the cut-off discharge voltage and continues to discharge, the internal pressure of the battery will increase, the reversibility of positive and negative active substances will be damaged, and the capacity of the battery will be significantly reduced.

 

Over charge

When the battery is charged, if the battery is still charged after fully charged, it may lead to the increase of the internal pressure, the deformation and leakage of the battery, and the performance of the battery will be significantly reduced and damaged.

 

Energy density

The energy released by the average unit volume or mass of a battery. Generally, under the same volume, the energy density of lithium-ion battery is 2.5 times of that of nickel cadmium battery and 1.8 times of that of nickel hydrogen battery. Therefore, under the condition of equal battery capacity, lithium-ion battery will have smaller volume and lighter weight than nickel cadmium and nickel hydrogen battery.

 

Self-discharge

Whether in use or not, the battery power loss occurs due to various reasons.
The monthly self-discharge rate of industry standard of lithium-ion battery is less than 12%. The self-discharge rate is related to the placement performance of the battery, and is also related to the internal resistance structure and material performance of the battery

 

Cycle life

The battery is fully discharged after it is fully charged, and the cycle is carried out until the capacity decreases to 75% of the initial capacity. At this time, the number of cycles is the cycle life of the battery.
The cycle life is related to the charging and discharging conditions of the battery.

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