Charging method, charging device, and computer-readable medium for charging a battery

1. A charging method, comprising:

in a first stage of charging, charging a battery with a first-stage current until a voltage of the battery reaches a first-stage voltage value; and

in a second stage of charging, charging the battery with a second-stage current until the voltage of the battery reaches a second-stage voltage value; wherein the second-stage voltage value is greater than the first-stage voltage value, and the second-stage current is smaller than the first-stage current;

wherein the first-stage voltage value is equal to a charging limit voltage value for the battery, and the second-stage voltage value is smaller than an oxidative decomposition voltage of an electrolyte of the battery.

2. The charging method of claim 1 , wherein the second stage includes N sub-stages, wherein N is a positive integer;

wherein: in an i th sub-stage, which is one of the N sub-stages, the battery is charged at one of an i th current, an i th voltage and an i th power;

in an (i+1) th sub-stage, the battery is charged at one of an (i+1) th current, an (i+1) th voltage and an (i+1) th power; and

the (i+1) th current has a current value equal to or smaller than that of the i th current.

3. The charging method of claim 2 , wherein the battery is charged to the second-stage voltage value in the N th sub-stage, with a charge condition of an N th current, an N th voltage or an N th power.

4. The charging method of claim 3 , wherein the second-stage voltage value is smaller than or equal to the first-stage voltage value plus 500 millivolts (mV).

5. The charging method of claim 2 , wherein: the battery is charged at the i th voltage in the i th sub-stage, and is charged at the (i+1) th voltage in the (i+1) th sub-stage; and

the (i+1) th voltage is greater than or equal to the i th voltage.

6. The charging method of claim 2 , wherein: the battery is charged at the i th power in the i th sub-stage, and is charged at the (i+1) th power in the (i+1) th sub-stage; and

the (i+1) th power is smaller than or equal to the i th power.

7. The charging method of claim 1 , wherein: the second stage includes N sub-stages, wherein N is a positive integer, and each of the sub-stages includes a first portion and a second portion;

in one of the first portion and the second portion of an i th sub-stage, which is one of the N sub-stages, the battery is charged at a first i th sub-stage current for a time length of Ti 1 , wherein the first i th sub-stage current has a current value that is zero, a positive value or a negative value;

in the other one of the first portion and the second portion of the i th sub-stage, the battery is charged at a second i th sub-stage current for a time length of Ti 2 ; and

an absolute value of a current value of the first i th sub-stage current is smaller than that of the second i th sub-stage current.

8. The charging method of claim 7 , wherein an average of the second-stage current in the first sub-stage is smaller than the first-stage current, and an average of the second-stage current in an (i+1) th sub-stage is smaller than an average of the second-stage current in the sub-stage.

9. A computer-readable medium, storing one or more programs, the one or more programs including a plurality of instructions, wherein when the plurality of instructions are executed by a computerized terminal with one or more processors, the plurality of instructions cause the computerized terminal to perform a charging method, comprising:

in a first stage of charging, charging a battery with a first-stage current until a voltage of the battery reaches a first-stage voltage value; and

in a second stage of charging, charging the battery with a second-stage current until the voltage of the battery reaches a second-stage voltage value; wherein the second-stage voltage value is greater than the first-stage voltage value, and the second-stage current is smaller than the first-stage current;

wherein the first-stage voltage value is equal to a charging limit voltage value for the battery, and the second-stage voltage value is smaller than an oxidative decomposition voltage of an electrolyte of the battery.

10. A charging device adapted for charging a battery, comprising:

a charging-discharging module adapted to be electrically connected to the battery for charging or discharging the battery; and

a control unit electrically connected to said charging-discharging module, and configured to operate in one of a first stage and a second stage of charging, wherein the control unit controls the charging-discharging module to charge the battery;

wherein: when the control unit operates in the first stage of charging, the control unit controls the charging-discharging module to charge the battery with a first-stage current until a voltage of the battery reaches a first-stage voltage value;

when the control unit operates in the second stage of charging, the control unit controls the charging-discharging module to charge the battery with a second-stage current until the voltage of the battery reaches a second-stage voltage value which is greater than the first-stage voltage value; and

the second-stage current is smaller than the first-stage current;

wherein the first-stage voltage value is equal to a charging limit voltage value for the battery, and the second-stage voltage value is smaller than an oxidative decomposition voltage of an electrolyte of the battery.

11. The charging device of claim 10 , wherein the second stage includes N sub-stages, wherein N is a positive integer;

wherein: in an i th sub-stage, which is one of the N sub-stages, the control unit controls the charging-discharging module to charge the battery at one of an i th current, an i th voltage and an i th power;

in an (i+1) th sub-stage, the control unit controls the charging-discharging module to charge the battery at one of an (i+1) th current, an (i+1) th voltage and an (i+1) th power; and

the (i+1) th current has a current value smaller than that of the i th current.

12. The charging device of claim 11 , wherein the battery is charged to the second-stage voltage value in the N th sub-stage, wherein the control unit controls the charging-discharging module to charge the battery at one of an N th current, an N th voltage and an N th power.

13. The charging device of claim 12 , wherein a difference of the second-stage voltage value and the first-stage voltage value is equal to or smaller than 500 millivolts (mV).

14. The charging device of claim 11 , wherein: the control unit controls the charging-discharging module to charge the battery at the i th voltage in the i th sub-stage, and charge the battery at the (i+1) th voltage in the (i+1) th sub-stage; and

the (i+1) th voltage is greater than or equal to the i th voltage.

15. The charging device of claim 11 , wherein: the control unit controls the charging-discharging module to charge the battery at the i th power in the i th sub-stage, and charge the battery at the (i+1) th power in the (i+1) th sub-stage; and

the (i+1) th power is smaller than or equal to the i th power.

16. The charging device of claim 10 , wherein: the second stage includes N sub-stages, wherein N is a positive integer, and each of the sub-stages includes a first portion and a second portion;

in one of the first portion and the second portion of an i th sub-stage, which is one of the N sub-stages, the control unit controls the charging-discharging module to charge the battery at a first i th sub-stage current for a time length of Ti 1 , wherein the first i th sub-stage current has a current value equal to zero, a positive value or a negative value;

in the other one of the first portion and the second portion of the i th sub-stage, the control unit controls the charging-discharging module to charge the battery at a second i th sub-stage current for a time length of Ti 2 ; and

an absolute value of a current value of the first i th sub-stage current is smaller than that of the second i th sub-stage current.

17. The charging device of claim 16 , wherein an average of the second-stage current in the first sub-stage is smaller than the first-stage current, and an average of the second-stage current in an (i+1) th sub-stage is smaller than an average of the second-stage current in the i th sub-stage.