# US 12,000,904 B2 · Estimation device, estimation method, and computer program

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- Number: US 12,000,904 B2
- Document ID: US12000904B2
- Status: Granted
- Kind: B2
- Application number: 17/754,230
- Filed: 2020-09-30
- Published: 2022-11-24
- Granted: 2024-06-04
- Earliest claimed: 2019-09-30
- Assignees: GS Yuasa International Ltd.
- Applicants: GS Yuasa International Ltd.
- Inventors: Ryosuke Takehana; Nan Ukumori
- Web page: https://patentgrep.com/patent/US12000904B2

## CPC

- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- G01R 31/374: with means for correcting the measurement for temperature or ageing
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- H01M 10/486: {for measuring temperature}
- H02J 7/82: Control of state of charge [SOC]
- H02J 7/84: Control of state of health [SOH]
- H02J 7/933: {the cycle being controlled or terminated in response to electric parameters}
- H02J 7/973: {in response to degree of gas development in the battery}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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

An estimation device 4 is provided with: an acquisition unit 41 for acquiring time-series data about an SOC of a power storage element; a specification unit 41 for specifying a fluctuation range of the SOC in the time-series data and an SOC representative value representing an SOC region in the fluctuation range; and an estimation unit 41 for estimating a shape change of the power storage element on the basis of the specified fluctuation range and the specified representative value.

## Claims

### Claim 1

An estimation device comprising:
an acquisition unit that acquires time-series data of an SOC in an energy storage device;
a determination unit that determines a fluctuation range of the SOC in the time-series data and an SOC representative value representing an SOC region in the fluctuation range; and
an estimation unit that estimates a shape change of the energy storage device based on the determined fluctuation range and the determined SOC representative value.

### Claim 2 (depends on 1)

The estimation device according to claim 1, wherein:
the determination unit acquires a charge start point and a discharge start point based on the time-series data, and
the determination unit determines the fluctuation range and the SOC representative value based on the acquired charge start point and the acquired discharge start point.

### Claim 3 (depends on 1)

The estimation device according to claim 1, wherein:
the determination unit calculates, based on the time-series data, the fluctuation range and the SOC representative value each time the SOC reaches a threshold from a start point, and
the determination unit determines the fluctuation range and the SOC representative value calculated from the start point to a calculation time point.

### Claim 4 (depends on 1)

The estimation device according to claim 1, wherein:
the determination unit calculates a standard deviation and an average value of the SOC based on the time-series data, and
the determination unit determines the calculated standard deviation and average value as the fluctuation range and the SOC representative value.

### Claim 5 (depends on 1)

The estimation device according to claim 1, wherein:
the determination unit converts a waveform of fluctuation of the SOC in the time-series data into a frequency component, and
the determination unit determines an amplitude of the converted frequency component as the fluctuation range, and a frequency as a fluctuation amount of the SOC.

### Claim 6 (depends on 1)

The estimation device according to claim 1, wherein:
the estimation unit determines an expansion coefficient based on the determined fluctuation range and the determined SOC representative value with reference to a relationship between the fluctuation range, the SOC representative value, and the expansion coefficient, and
the estimation unit estimates the shape change based on the determined expansion coefficient and a fluctuation amount of the SOC or time.

### Claim 7 (depends on 1)

The estimation device according to claim 1, wherein:
the estimation unit calculates the shape change of the energy storage device at the time of energization based on the fluctuation range and the SOC representative value, and
the estimation unit estimates the shape change by adding a temporal shape change of the energy storage device to the calculated shape change.

### Claim 8 (depends on 1)

The estimation device according to claim 1, further comprising a prediction unit that predicts a remaining life of the energy storage device based on the shape change estimated by the estimation unit.

### Claim 9 (depends on 1)

The estimation device according to claim 1, wherein the shape change includes information on pressure applied to at least one surface of the energy storage device.

### Claim 10 (depends on 1)

The estimation device according to claim 1, wherein:
the acquisition unit acquires a temperature of the energy storage device in a section corresponding to the SOC region,
the determination unit determines a temperature representative value representing the temperature of the section, and
the estimation unit estimates the shape change based on the temperature representative value.

### Claim 11

An estimation method comprising:
acquiring time-series data of an SOC in an energy storage device;
determining a fluctuation range of the SOC in the time-series data and a representative value of the SOC representing an SOC region in the fluctuation range; and
estimating a shape change of the energy storage device based on the determined fluctuation range and the determined representative value.

### Claim 12

A computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions stored therein and configured for:
estimating time-series data of an SOC in an energy storage device;
determining a fluctuation range of the SOC in the estimated time-series data and a representative value of the SOC representing an SOC region in the fluctuation range; and
estimating a shape change of the energy storage device based on the determined fluctuation range and the determined representative value.

### Claim 13

An estimation device comprising:
a first acquisition unit that acquires time-series data of an SOC in an energy storage device;
a second acquisition unit that acquires a shape change of the energy storage device;
a determination unit that determines a representative value of the SOC in a predetermined period of the time-series data and an SOC fluctuation amount; and
an estimation unit that estimates deterioration of the energy storage device based on the determined representative value, the determined SOC fluctuation amount, and the acquired shape change.

### Claim 14 (depends on 13)

The estimation device according to claim 13, wherein:
the estimation unit determines a coefficient based on the determined representative value and the determined SOC fluctuation amount with reference to a relationship between the representative value, the SOC fluctuation amount, and the coefficient, and
the estimation unit estimates the deterioration based on the determined coefficient and the acquired shape change.

### Claim 15 (depends on 14)

The estimation device according to claim 14, further comprising a third acquisition unit that acquires a temperature of the energy storage device in a period in which the time-series data is acquired,
wherein the determination unit determines a temperature representative value based on the acquired temperature, and
wherein the estimation unit estimates the deterioration based on the determined temperature representative value.

### Claim 16 (depends on 13)

The estimation device according to claim 13, further comprising a third acquisition unit that acquires a temperature of the energy storage device in a period in which the time-series data is acquired,
wherein the determination unit determines a temperature representative value based on the acquired temperature, and
wherein the estimation unit estimates the deterioration based on the determined temperature representative value.