# US 11,909,245 B2 · Battery charging method and apparatus, and storage medium

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- Number: US 11,909,245 B2
- Document ID: US11909245B2
- Status: Granted
- Kind: B2
- Application number: 17/332,980
- Filed: 2021-05-27
- Published: 2022-03-10
- Granted: 2024-02-20
- Earliest claimed: 2020-09-07
- Assignees: Beijing Xiaomi Mobile Software Co., Ltd.
- Applicants: Beijing Xiaomi Mobile Software Co., Ltd.
- Inventors: Jinhu Zhang; Huan Dang
- Web page: https://patentgrep.com/patent/US11909245B2

## CPC

- H02J 7/96: in response to battery voltage
- H02J 7/64: against overvoltage
- H02J 7/80: including monitoring or indicating arrangements
- H02J 7/94: in response to battery current
- H02J 7/965: {obtained with the battery disconnected from the charge or discharge circuit}
- Y02E 60/10: Energy storage using batteries
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A battery charging method includes: acquiring a current static voltage of a battery in a current charging stage, and determining the maximum charging current matching with the current static voltage, during staged charging of the battery; and charging the battery according to the maximum charging current. The charging speed can be guaranteed, and the overvoltage protection cannot be triggered during each charging stage, thereby preventing damages to battery cells.

## Claims

### Claim 1

A battery charging method, comprising:
acquiring a current static voltage of a battery in a current charging stage, and determining the maximum charging current matching with the current static voltage, during staged charging of the battery; and
charging the battery according to the maximum charging current,
wherein the determining the maximum charging current matching with the current static voltage comprises:
determining the maximum charging current matching with the current static voltage according to a real-time static voltage and a real-time DC resistance of the battery, when the current static voltage is greater than or equal to a charging voltage threshold corresponding to the current charging stage;
acquiring the real-time DC resistance and the real-time static voltage of the battery in real-time;
determining the maximum charging current matching with the real-time DC resistance and matching with the real-time static voltage based on a corresponding relationship among the DC resistance, the static voltage, and the maximum charging current; and
the corresponding relationship among the DC resistance, the static voltage, and the maximum charging current is predetermined by:
determining the longest response time of a system that triggers an overvoltage protection in the current charging stage, during the staged charging of the battery with different maximum charging currents according to different voltages, in response to the static voltage of the battery being greater than or equal to the charging voltage threshold corresponding to the current charging stage, and detecting the DC resistance and the static voltage of the battery in real-time in the current charging stage;
determining the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage, wherein the maximum charging current matching with the DC resistance and matching with the static voltage satisfies a requirement of not triggering the overvoltage protection within the longest response time of the system; and creating and storing the corresponding relationship among the DC resistance, the static voltage, and the maximum charging current.

### Claim 2 (depends on 1)

The battery charging method according to claim 1, wherein the determining the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage comprises:
when a same DC resistance corresponds to a plurality of static voltages, determining the maximum charging current corresponding to each static voltage of the plurality of static voltages respectively.

### Claim 3 (depends on 1)

The battery charging method according to claim 1, wherein the determining the maximum charging current matching with the current static voltage comprises:
when the current static voltage is less than a charging voltage threshold corresponding to the current charging stage, determining the maximum charging current allowed in the current charging stage as the maximum charging current matching with the current static voltage; and
the charging the battery according to the maximum charging current comprises:
charging the battery according to the maximum charging current allowed in the current charging stage until the maximum charging voltage of the battery in the current stage.

### Claim 4 (depends on 1)

A battery charging apparatus implementing the battery charging method according to claim 1, comprising:
a processor; and
memory for storing processor executable instructions;
wherein, the processor is configured to execute steps of the battery charging method.

### Claim 5 (depends on 1)

A non-transitory computer-readable storage medium having stored thereon instructions for execution by a processor of a mobile terminal which is enabled to execute the battery charging method according to claim 1.

### Claim 6 (depends on 5)

The non-transitory computer-readable storage medium according to claim 5, wherein the determining the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage comprises:
when a same DC resistance corresponds to a plurality of static voltages, determining the maximum charging current corresponding to each static voltage of the plurality of static voltages respectively.

### Claim 7 (depends on 5)

The non-transitory computer-readable storage medium according to claim 5, wherein the determining the maximum charging current matching with the current static voltage comprises:
when the current static voltage is less than a charging voltage threshold corresponding to the current charging stage, determining the maximum charging current allowed in the current charging stage as the maximum charging current matching with the current static voltage; and
the charging the battery according to the maximum charging current comprises:
charging the battery according to the maximum charging current allowed in the current charging stage until the maximum charging voltage of the battery in the current stage.

### Claim 8 (depends on 1)

A battery charging device implementing the method of claim 1, wherein the battery charging device is configured to charge the battery according to the maximum charging current matching with the current static voltage to ensure a charging speed and that that overvoltage protection will not be triggered during each charging stage, thereby preventing battery damage.

### Claim 9

A battery charging apparatus, comprising:
a determining circuit, configured to acquire a current static voltage of a battery in a current charging stage, and determine the maximum charging current matching with the current static voltage, during staged charging of the battery; and
a charging circuit, configured to charge the battery according to the maximum charging current,
wherein the determining circuit is configured to determine the maximum charging current matching with the current static voltage by:
determining the maximum charging current matching with the current static voltage according to a real-time static voltage and a real-time DC resistance of the battery, when the current static voltage is greater than or equal to a charging voltage threshold corresponding to the current charging stage;
acquiring the real-time DC resistance and the real-time static voltage of the battery in real-time;
determining the maximum charging current matching with the real-time DC resistance and matching the real-time static voltage based on a corresponding relationship among the DC resistance, the static voltage, and the maximum charging current;
determining the longest response time of a system that triggers an overvoltage protection in the current charging stage, during the staged charging of the battery with different maximum charging currents according to different voltages, in response to the static voltage of the battery being greater than or equal to the charging voltage threshold corresponding to the current charging stage, and detecting the DC resistance and the static voltage of the battery in real-time in the current charging stage;
determining the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage, wherein the maximum charging current matching with the DC resistance and matching with the static voltage satisfies a requirement of not triggering the overvoltage protection within the longest response time of the system; and
creating and storing the corresponding relationship among the DC resistance, the static voltage, and the maximum charging current.

### Claim 10 (depends on 9)

The battery charging apparatus according to claim 9, wherein the determining circuit is configured to determine the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage by:
when a same DC resistance corresponds to a plurality of static voltages, determining the maximum charging current corresponding to each static voltage of the plurality of static voltages respectively.

### Claim 11 (depends on 9)

The battery charging apparatus according to claim 9, wherein the determining circuit is configured to determine the maximum charging current matching with the current static voltage in the following manner:
when the current static voltage is less than a charging voltage threshold corresponding to the current charging stage, determining the maximum charging current allowed in the current charging stage as the maximum charging current matching with the current static voltage; and
the charging circuit is configured to charge the battery according to the maximum charging current by:
charging the battery according to the maximum charging current allowed in the current charging stage until the maximum charging voltage of the battery in the current stage.