The Relationship between Lithium Battery Recharging Cycle and Recharging Life

The lithium battery charging cycle is closely related to the lithium battery life. A charging cycle specifically refers to a lithium battery full charge and discharge process. If decomposed, a charging cycle consists of a full charge and a full discharge process. Lithium battery life is related to the number of times its charging cycle is completed, and there is no relationship with the frequency of lithium battery charging and discharging.

The lithium battery charging cycle is closely related to the lithium battery life. A charging cycle specifically refers to a lithium battery full charge and discharge process. If decomposed, a charging cycle consists of a full charge and a full discharge process. Lithium battery life is related to the number of times its charging cycle is completed, and there is no relationship with the frequency of lithium battery charging and discharging.

In other words, the lithium battery charging cycle is an expression of the lithium battery power, which means that the battery power is from full to empty and then from empty to full. From the voltage point of view in the existing battery design, a single lithium battery has been used from an empty load of 4.2 V(capacity is nominal capacity) to 2.75 V(capacity is zero at this time) and completed a reverse process to complete a charging cycle.

In this process, if the battery starts charging at a certain voltage value between 4.2 V and 2.75 V, it can not be counted as a charging period. In terms of capacity, a 2200mAh lithium battery can not be counted as a charging cycle if it starts charging when there is still 1100 mAh capacity, but can only be counted as half a cycle. However, in this way, this lithium battery can be charged and discharged 1,000 times(500 times in a cycle).

From the numerical point of view, a lithium battery with a charging period equal to the total electrical power that a fully charged lithium battery can output, still takes the example of a new lithium battery with a nominal 2200mAh. The electrical power it can output is 8.14 Wh, that is to say, the charged battery is enough to work at a current of 2200mA for one hour, which is the meaning of complete charging and discharging.

Now the designed lithium battery charging cycle can generally reach 500 times, which is the life of the lithium battery. The IEC standard stipulates that after 500 cycles of lithium batteries, the charge should be 60 %.

Here, to correct the false perception that consumers use advertisements that "can be charged more than 1,000 times" as a measure of lithium battery life, as mentioned above, one charging behavior may complete one charging cycle, but it may also be only half a charging cycle. Some lithium battery manufacturers may mislead consumers by promoting this description with loose parameters for battery performance considerations. In fact, the principle that lithium batteries can be counted as a charging cycle from zero to nominal capacity and then from nominal capacity to zero has not changed.

Therefore, the life of a lithium battery can be improved by a certain method, but it is always based on the charging cycle, which limits the improvement of life to a limited range.

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