A precharge method for improving lithium analysis

Abstract

The invention discloses a pre-charging method for improving lithium analysis. The method is divided into four steps. The first step is to charge the battery with a small current so that a solid electrolyte interface film is formed on the surface of the cell of the battery. The second step is to charge the battery with a small current. The battery continues to be charged until the voltage of the battery reaches a preset voltage range, the current value of the current in the first step is smaller than the current value of the current in the second step, and the third step is to continue to charge the battery until the The voltage of the battery reaches the preset voltage range, the current value of the second step current is smaller than the current value of the third step current, and the constant voltage charging method is used until the voltage of the battery reaches the charging cut-off current; Precharge the battery with a small current to form a solid electrolyte interface film on the battery cell, and then gradually charge it with a larger current. This method can improve the problem of lithium analysis, improve the safety performance and service life of the battery cell.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery charging, and in particular relates to a pre-charging method for improving lithium analysis. Background technique [0002] With the popularization of various mobile terminals, lithium-ion batteries have become mainstream power supply products due to their advantages such as high energy density and high average output voltage. In the increasingly popular power market, shortening the production cycle, increasing production capacity, and intentionally reducing the pre-charging time of lithium-ion batteries, but the current common practice is to increase the pre-charging current. Although this method can achieve immediate results, it also brings unavoidable Problems to avoid - Lithium precipitation, that is, metal lithium will be precipitated on the surface of the anode cell. This process is irreversible. Lithium deposition will reduce the safety performance and service life of the cell. Contents ...

AI Technical Summary

Problems solved by technology

[0002] With the popularity of various mobile terminals, lithium-ion batteries have become mainstream power supply products due to their advantages such as high energy density and high average output voltage. In the increasingly hot power market, shortening the production cycle, increasing production capacity, and intentionally reducing the pre-charging time of lithium-ion batteries, but the current common practice is to increase the pre-charging current. Problems to avoid - Lithium analysis, that is, metal lithium will be precipitated on the surface of the anode cell. This process is irreversible. Lithium analysis will reduce the safety performance and service life of the cell

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