A method for charging a lithium ion battery, comprising: acquiring a polarization attribute of the lithium ion battery, wherein the polarization attribute comprises a maximum charging current under which no lithium plating occurs at an anode of the lithium ion battery; determining, according to the polarization attribute, a plurality of sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence; charging the lithium ion battery in sections with the plurality of sections of constant charging currents respectively, and after charging in each section, leaving the lithium ion battery standing or discharging the lithium ion battery with a preset discharging current less than the maximum charging current (S 130); and performing 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, characterized in that, the determining, according to the polarization attribute, a plurality of sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence comprises: determining, according to the polarization attribute, the current values of the plurality of sections of constant charging currents which have current values sequentially decreasing in the sectional charging sequence, wherein the current value of a first section of constant charging current in the plurality of sections of constant charging currents for charging the lithium ion battery ranges from 1.1 times to 2.0 times of a current value of the maximum charging current; determining a plurality of sections of anode lithium plating potentials, having one-to-one correspondences with the current values of the plurality of sections of constant charging currents, of the lithium ion battery based on the current values of the plurality of sections of constant charging currents; and determining a charging time for charging in each section according to the polarization attribute, under a condition that a potential reached by the lithium ion battery during charging in the section is less than the anode lithium plating potential of the section. acquiring a polarization attribute of the lithium ion battery, wherein the polarization attribute comprises a maximum charging current under which no lithium plating occurs at an anode of the lithium ion battery; determining, according to the polarization attribute, a plurality of sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence; charging the lithium ion battery in sections with the plurality of sections of constant charging currents respectively, and after charging in each section, leaving the lithium ion battery standing or discharging the lithium ion battery with a preset discharging current less than the maximum charging current (S 130); and performing 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, characterized in that, the determining, according to the polarization attribute, a plurality of sections of constant charging currents which have current values decreasing sequentially in a sectional charging sequence comprises: determining, according to the polarization attribute, the current values of the plurality of sections of constant charging currents which have current values sequentially decreasing in the sectional charging sequence, wherein the current value of a first section of constant charging current in the plurality of sections of constant charging currents for charging the lithium ion battery ranges from 1.1 times to 2.0 times of a current value of the maximum charging current; determining a plurality of sections of anode lithium plating potentials, having one-to-one correspondences with the current values of the plurality of sections of constant charging currents, of the lithium ion battery based on the current values of the plurality of sections of constant charging currents; and determining a charging time for charging in each section according to the polarization attribute, under a condition that a potential reached by the lithium ion battery during charging in the section is less than the anode lithium plating potential of the section. determining, according to the polarization attribute, the current values of the plurality of sections of constant charging currents which have current values sequentially decreasing in the sectional charging sequence, wherein the current value of a first section of constant charging current in the plurality of sections of constant charging currents for charging the lithium ion battery ranges from 1.1 times to 2.0 times of a current value of the maximum charging current; determining a plurality of sections of anode lithium plating potentials, having one-to-one correspondences with the current values of the plurality of sections of constant charging currents, of the lithium ion battery based on the current values of the plurality of sections of constant charging currents; and determining a charging time for charging in each section according to the polarization attribute, under a condition that a potential reached by the lithium ion battery during charging in the section is less than the anode lithium plating potential of the section.