CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority to Chinese patent application No. 201910804036.8 filed on Aug. 28, 2019, the disclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND

With the development of battery technologies, lithium ion batteries are extensively applied to mobile terminals such as mobile phones and tablets currently due to high power, long battery life, lightweight, low cost and high safety thereof. However, on one hand, a lithium plating phenomenon may occur to an anode in a charging process of a lithium ion battery, which affects safety of the lithium ion battery and shorten service life. Therefore, a method for safely charging a lithium ion battery is needed. On the other hand, it takes several hours for charging a lithium ion battery, and the long charging time results in inconvenience to a user. Therefore, there is an increasingly urgent need for rapidly charging a lithium ion battery.

SUMMARY

The present disclosure generally relates to the technical field of batteries, and more specifically to a method for charging a lithium ion battery and a device for charging a lithium ion battery.

According to a first aspect of the present disclosure, a method for charging a lithium ion battery is provided, which include operations as follows. A polarization attribute of the lithium ion battery is acquired. The polarization attribute includes a maximum charging current under which no lithium plating occurs at an anode of the lithium ion battery. Multiple sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence are determined according to the polarization attribute. The lithium ion battery is charged in sections with the multiple sections of constant charging currents. After being charged in each section, the lithium ion battery is left standing or the lithium ion battery is discharged with a preset discharging current less than the maximum charging current. Constant-voltage charging is performed with taking a constant-current cut-off voltage as a constant voltage when a voltage of the lithium ion battery reaches the constant-current cut-off voltage.

According to a second aspect of the present disclosure, a device for charging a lithium ion battery is provided, which includes: a processor, and a memory configured to store an instruction executable by the processor. The processor is configured to: acquire a polarization attribute of a lithium ion battery, where the polarization attribute includes a maximum charging current under which no lithium plating occurs at an anode of the lithium ion battery; determine, according to the polarization attribute, multiple sections of constant charging currents which have current values sequentially decreasing in a sectional charging sequence; charge the lithium ion battery in sections with the multiple sections of constant charging currents respectively and, after charging in each section, leave the lithium ion battery standing or discharge the lithium ion battery with a preset discharging current less than the maximum charging current; and perform constant-voltage charging with taking a constant-current cut-off voltage as a constant voltage when a voltage of the lithium ion battery reaches the constant-current cut-off voltage.

According to a third aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, which has a computer-executable instruction stored thereon for execution by a processor to implement any method in the abovementioned methods. The method includes operations as follows. A polarization attribute of the lithium ion battery is acquired. The polarization attribute includes a maximum charging current under which no lithium plating occurs at an anode of the lithium ion battery. Multiple sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence are determined according to the polarization attribute. The lithium ion battery is charged in sections with the multiple sections of constant charging currents. After being charged in each section, the lithium ion battery is left standing or the lithium ion battery is discharged with a preset discharging current less than the maximum charging current. Constant-voltage charging is performed with taking a constant-current cut-off voltage as a constant voltage when a voltage of the lithium ion battery reaches the constant-current cut-off voltage.

It is to be understood that the above general descriptions and following detailed descriptions are only exemplary and explanatory and not intended to limit the present disclosure.

