# US 12,184,107 B2 · Charging controller, rechargeable battery, electronic device, and control method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,184,107 B2
- Document ID: US12184107B2
- Status: Granted
- Kind: B2
- Application number: 18/479,633
- Filed: 2023-10-02
- Published: 2024-01-25
- Granted: 2024-12-31
- Earliest claimed: 2020-06-22
- Assignees: Lenovo (Singapore) Pte. Ltd.
- Applicants: Lenovo (Singapore) Pte. Ltd.
- Inventors: Hiromitsu Yamaguchi; Tadashi Kosuga; Hideki Otsuki; Koichi Fukuoka
- Web page: https://patentgrep.com/patent/US12184107B2

## CPC

- H02J 7/82: Control of state of charge [SOC]
- H02J 7/825: {Detection of fully charged condition}
- G01R 31/36: Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- H02J 7/96: in response to battery voltage
- 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
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A charging controller includes an internal resistance measurement unit configured to measure an internal resistance of a rechargeable battery multiple times over a charging period of the rechargeable battery; a detection unit configured to detect a peak of the internal resistance based on a change in the internal resistance measured by the internal resistance measurement unit; and an update unit configured to update a full charge capacity of the rechargeable battery referring to the peak of the internal resistance detected by the detection unit.

## Claims

### Claim 1

A charging controller, comprising:
an internal resistance measurement unit configured to measure an internal resistance of a rechargeable battery multiple times over a charging period of the rechargeable battery;
a detection unit configured to detect a peak of the internal resistance based on a change in the internal resistance measured by the internal resistance measurement unit;
a voltage measurement unit configured to measure a voltage of the rechargeable battery; and
an update unit configured to update a full charge capacity of the rechargeable battery referring to the peak of the internal resistance detected by the detection unit,
wherein the internal resistance measurement unit raises a measurement frequency of the internal resistance when the voltage measured by the voltage measurement unit during the charging period of the rechargeable battery has reached a predetermined threshold value.

### Claim 2 (depends on 1)

The charging controller according to claim 1, wherein
the internal resistance measurement unit lowers the measurement frequency in response to a detection of the peak of the internal resistance by the detection unit.

### Claim 3 (depends on 1)

The charging controller according to claim 1, wherein
the detection unit detects the peak when an amount of change in a value of the internal resistance measured by the internal resistance measurement unit over multiple times has become less than or equal to a predetermined threshold value.

### Claim 4 (depends on 1)

A rechargeable battery comprising the charging controller according to claim 1.

### Claim 5 (depends on 4)

An electronic device comprising the rechargeable battery according to claim 4.

### Claim 6

A charging controller, comprising:
an internal resistance measurement unit configured to measure an internal resistance of a rechargeable battery multiple times over a charging period of the rechargeable battery;
a detection unit configured to detect a peak of the internal resistance based on a change in the internal resistance measured by the internal resistance measurement unit;
and
an update unit configured to update a full charge capacity of the rechargeable battery referring to the peak of the internal resistance detected by the detection unit, wherein
by temporarily stopping a charging current during the charging period of the rechargeable battery, the internal resistance measurement unit calculates the internal resistance of the rechargeable battery based on a difference between a voltage of the rechargeable battery before a stoppage and that of the rechargeable battery during the stoppage.

### Claim 7

A control method in a charging controller, comprising:
measuring an internal resistance of a rechargeable battery multiple times over a charging period of the rechargeable battery by an internal resistance measurement unit;
detecting a peak of the internal resistance based on a change in the internal resistance measured by the internal resistance measurement unit by a detection unit;
measuring a voltage of the rechargeable battery by a voltage measurement unit; and
updating a full charge capacity of the rechargeable battery referring to the peak of the internal resistance detected by the detection unit by an update unit,
wherein the internal resistance measurement unit raises a measurement frequency of the internal resistance when the voltage measured by the voltage measurement unit during the charging period of the rechargeable battery has reached a predetermined threshold value.