# US 11,029,361 B2 · Method for determining state of charge and electronic device thereof

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- Number: US 11,029,361 B2
- Document ID: US11029361B2
- Status: Granted
- Kind: B2
- Application number: 16/390,013
- Filed: 2019-04-22
- Published: 2020-06-11
- Granted: 2021-06-08
- Earliest claimed: 2018-12-05
- Assignees: Acer Incorporated
- Applicants: Acer Incorporated
- Inventors: Chin-Yi Tsai
- Web page: https://patentgrep.com/patent/US11029361B2

## CPC

- G01R 31/3835: involving only voltage measurements
- G01R 31/3842: combining voltage and current measurements
- G01R 31/387: Determining ampere-hour charge capacity or SoC
- G01R 31/388: involving voltage measurements
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A method for determining a state of charge adapted for a battery is provided, the method including: obtaining a plurality of discharge curves; determining that the battery is in a discharge mode; measuring a current C-rate and a current voltage of the battery in the discharge mode; selecting a first discharge curve and a second discharge curve from the plurality of discharge curves, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and calculating a state of charge of the battery according to the first discharge curve and the second discharge curve.

## Claims

### Claim 1

An electronic device comprising:
a battery, supplying power of the electronic device;
a storage medium, storing a plurality of discharge curves and a plurality of commands; and
a controller coupled to the battery and the storage medium, the controller being configured to execute the plurality of commands, wherein the plurality of commands comprise:
determining that the battery is in a discharge mode;
measuring a current C-rate and a current voltage of the battery in the discharge mode;
selecting a first discharge curve and a second discharge curve from the plurality of discharge curves according to the current C-rate, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and
calculating a state of charge of the battery according to the first discharge curve and the second discharge curve, wherein
the plurality of discharge curves comprise a first discharge curve set having a C-rate greater than the current C-rate and a second discharge curve set having a C-rate less than the current C-rate,
among each of C-rates corresponding to the first discharge curve set, the first C-rate is closest to the current C-rate, and
among each of C-rates corresponding to the second discharge curve set, the second C-rate is closest to the current C-rate.

### Claim 2 (depends on 1)

The electronic device according to claim 1, wherein the operation of calculating the state of charge of the battery according to the first discharge curve and the second discharge curve comprises:
performing an interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge.

### Claim 3 (depends on 2)

The electronic device according to claim 2, wherein the operation of performing the interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge comprises:
obtaining a first state of charge corresponding to the current voltage from the first discharge curve;
obtaining a second state of charge corresponding to the current voltage from the second discharge curve; and
calculating the state of charge according to the current C-rate, the first C-rate, the second C-rate, the first state of charge, and the second state of charge.

### Claim 4 (depends on 1)

The electronic device according to claim 1, wherein the plurality of commands further comprise:
determining that the battery is in a resting mode;
measuring a second voltage of the battery in the resting mode; and
calculating the state of charge of the battery according to the second voltage.

### Claim 5

A method for determining a state of charge adapted for a battery, the method comprising:
obtaining a plurality of discharge curves;
determining that the battery is in a discharge mode;
measuring a current C-rate and a current voltage of the battery in the discharge mode;
selecting a first discharge curve and a second discharge curve from the plurality of discharge curves according to the current C-rate, wherein a first C-rate corresponding to the first discharge curve is greater than the current C-rate, and a second C-rate corresponding to the second discharge curve is less than the current C-rate; and
calculating a state of charge of the battery according to the first discharge curve and the second discharge curve, wherein
the plurality of discharge curves comprise a first discharge curve set having a C-rate greater than the current C-rate and a second discharge curve set having a C-rate less than the current C-rate,
among each of C-rates corresponding to the first discharge curve set, the first C-rate is closest to the current C-rate, and
among each of C-rates corresponding to the second discharge curve set, the second C-rate is closest to the current C-rate.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the step of calculating the state of charge of the battery according to the first discharge curve and the second discharge curve comprises:
performing an interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the step of performing the interpolation operation on the first discharge curve and the second discharge curve to calculate the state of charge comprises:
obtaining a first state of charge corresponding to the current voltage from the first discharge curve;
obtaining a second state of charge corresponding to the current voltage from the second discharge curve; and
calculating the state of charge according to the current C-rate, the first C-rate, the second C-rate, the first state of charge, and the second state of charge.

### Claim 8 (depends on 5)

The method according to claim 5, further comprising:
determining that the battery is in a resting mode;
measuring a second voltage of the battery in the resting mode; and
calculating the state of charge of the battery according to the second voltage.