Step charging method

Abstract

The invention discloses a rapid charging method of a lithium ion battery, which uses step charging; the method comprises at least two charging steps and one discharging step, wherein after the first charging step is finished, the discharging step is carried out once and then the second charging step is carried out; upper and lower voltage limits of the second charging step are higher than or equal to those of the first charging step; after each charging step is finished, the battery stands for a section of time; and when open-circuit voltage drop is less than one value after one charging step is finished, the charging is stopped. Through the adoption of the rapid charging method disclosed by the invention, the effective capacity of the battery is increased and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a charging method for lithium ion batteries. Background technique [0002] With the increasingly widespread application of lithium-ion batteries, the demand for batteries continues to increase. For users, on the one hand, they are eager to increase the battery capacity, and on the other hand, they hope to shorten the charging time. The charging method of the battery becomes the key to solve this problem. [0003] At present, the commonly used charging method is the charging method of constant current and constant voltage. In this method, the constant voltage takes a long time during the charging process, and it is difficult to achieve the purpose of fast charging. Increasing the limiting voltage of the battery during constant current charging can achieve the purpose of fast charging, but if the limiting voltage of the battery is too high, side reactions will occur ...

AI Technical Summary

Problems solved by technology

[0003] The charging method commonly used at present is the charging method of constant current and constant voltage. In this method, the constant voltage takes a long time during the charging process, and it is difficult to achieve the purpose of fast charging.

Increasing the limiting voltage of the battery during constant current charging can achieve the purpose of fast charging, but if the battery limiting voltage is too high, side reactions will occur inside the battery; if the limiting voltage is too low, the battery will not be fully charged

[0004] One of the difficulties with conventional lithium-ion batteries is that when the battery is discharged close to 0V, it exhibits a loss of transfer capacity and cannot be charged by normal constant current and constant voltage charging methods.

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