Granted Patent B2

US 12,556,022 · App. 17/831,362 · Granted Feb 17, 2026

Inventors: Sitong Liu (Ningde, CN); Dongyang Shi (Ningde, CN); Shichao Li (Ningde, CN); Baiqing Li (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

H02J7/007182H02J7/0048

Abstract

Claims (50)

1 . A battery charging method, comprising:

obtaining a current voltage of a target battery;

determining a current capacity of the target battery based on the current voltage, including:

determining whether a time length between a latest update time of a current-time charge cut-off voltage and a current time is greater than a threshold; and

in response to determining that the time length between the latest update time of the current-time charge cut-off voltage and the current time is greater than the threshold, determining the current capacity of the target battery based on the current voltage;

determining a chargeable capacity of the target battery based on the current capacity;

obtaining a real-time voltage where the target battery is charged with the chargeable capacity;

determining a charge cut-off voltage of the target battery based on the real-time voltage; and

in a next charging of the target battery, controlling to charge the target battery using the determined charge cut-off voltage of the target battery.

2 . The method according to claim 1 , wherein determining the current capacity of the target battery based on the current voltage further comprises:

determining a current state of charge of the target battery based on the current voltage and a correspondence between voltages and states of charge of the target battery; and

determining the current capacity of the target battery based on the current state of charge and a design capacity of the target battery.

3 . The method according to claim 1 , wherein determining the chargeable capacity of the target battery based on the current capacity comprises:

determining the chargeable capacity of the target battery based on a design capacity and the current capacity of the target battery.

4 . The method according to claim 1 , wherein obtaining the real-time voltage where the target battery is charged with the chargeable capacity comprises:

obtaining current data of the target battery in a charging process;

determining a charged capacity of the target battery based on the current data and a charging duration; and

obtaining the real-time voltage where the charged capacity of the target battery reaches the chargeable capacity.

5 . The method according to claim 1 , wherein the method further comprises:

when the current voltage is greater than a preset voltage threshold, using the charge cut-off voltage as a voltage upper limit of the target battery in a current charging, wherein when the current charging is a first-time charging, the charge cut-off voltage is an initially set cut-off voltage, and when the current charging is an N th -time charging, the charge cut-off voltage is an initially set cut-off voltage, or a charge cut-off voltage obtained by updating after an M th -time charging, wherein N is a positive integer greater than 1, and M is a positive integer less than N.

6 . The method according to claim 5 , wherein the threshold is a first threshold, and using the charge cut-off voltage as the voltage upper limit of the target battery in the current charging comprises:

determining whether the time length between the latest update time of the current-time charge cut-off voltage and the current time is greater than a second threshold;

in response to determining that the time length between the latest update time of the current-time charge cut-off voltage and the current time is less than the second threshold, using the charge cut-off voltage as the voltage upper limit of the target battery in the current charging; and

in response to determining that the time length between the latest update time and the current time of the charge cut-off voltage is greater than the second threshold, outputting a prompt message that the charge cut-off voltage needs to be updated.

7 . The method according to claim 1 , wherein a ratio of a negative electrode capacity per unit area to a positive electrode capacity per unit area of the target battery is within a numerical value interval [0.8, 1.1].

8 . A charging apparatus, comprising:

a memory storing a program code; and

a processor configured to execute the program code to:

obtain a current voltage of a target battery;

determine a current capacity of the target battery based on the current voltage, including:

determining whether a time length between a latest update time of a current-time charge cut-off voltage and a current time is greater than a threshold; and

in response to determining that the time length between the latest update time of the current-time charge cut-off voltage and the current time is greater than the threshold, determining the current capacity of the target battery based on the current voltage;

determine a chargeable capacity of the target battery based on the current capacity;

obtain a real-time voltage where the target battery is charged with the chargeable capacity;

determine a charge cut-off voltage of the target battery based on the real-time voltage; and

in a next charging of the target battery, control to charge the target battery using the determined charge cut-off voltage of the target battery.

9 . A vehicle, comprising a target battery, a controller, and a memory, wherein the memory stores a machine-readable instruction capable of being executed by the controller; and when the target battery of the vehicle is charged, the machine-readable instruction is executed by the controller to implement the method according to claim 1 .

10 . A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores a computer program that, when executed by a processor, cause the processor to implement the steps of the method according to claim 1 .

11 . A battery charging method, comprising:

obtaining a current voltage of a target battery;

determining a current capacity of the target battery based on the current voltage;

determining a chargeable capacity of the target battery based on the current capacity;

obtaining a real-time voltage where the target battery is charged with the chargeable capacity;

determining a charge cut-off voltage of the target battery based on the real-time voltage;

in a next charging of the target battery, controlling to charge the target battery using the determined charge cut-off voltage of the target battery; and

when the current voltage is greater than a preset voltage threshold, using the charge cut-off voltage as a voltage upper limit of the target battery in a current charging, including:

determining whether a time length between a latest update time of a current-time charge cut-off voltage and a current time is greater than a threshold;

in response to determining that the time length between the latest update time of the current-time charge cut-off voltage and the current time is less than the threshold, using the charge cut-off voltage as the voltage upper limit of the target battery in the current charging; and

in response to determining that the time length between the latest update time and the current time of the charge cut-off voltage is greater than the second threshold, outputting a prompt message that the charge cut-off voltage needs to be updated;

wherein when the current charging is a first-time charging, the charge cut-off voltage is an initially set cut-off voltage, and when the current charging is an N th -time charging, the charge cut-off voltage is an initially set cut-off voltage, or a charge cut-off voltage obtained by updating after an M th -time charging, wherein N is a positive integer greater than 1, and M is a positive integer less than N.

Assignments (2)

Continuity (2)

References Cited (22)