# US 2016/0252582 A1 · State-of-charge estimating device, state-of-charge determining method, and state-of-charge determining program

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- Number: US 2016/0252582 A1
- Document ID: US20160252582A1
- Status: Published application
- Kind: A1
- Application number: 15/150,270
- Filed: 2016-05-09
- Published: 2016-09-01
- Earliest claimed: 2013-12-05
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: TAKUMA IIDA; HIROYUKI JINBO
- Web page: https://patentgrep.com/patent/US20160252582A1

## CPC

- H01M 10/4285: {Testing apparatus}
- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- G01R 31/3835: involving only voltage measurements
- G01R 31/388: involving voltage measurements
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- 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)
- H02J 7/82: Control of state of charge [SOC]
- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- H01M 10/06: Lead-acid accumulators (semi-lead accumulators H01M10/20)
- H02J 7/825: {Detection of fully charged condition}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- 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 state-of-charge estimating device includes an open-circuit voltage estimating part, a map selecting part, and a state-of-charge estimating part. The open-circuit voltage estimating part estimates an open-circuit voltage of a secondary battery. The map selecting part selects a map indicating a relationship between a first open-circuit voltage and a state of charge of the secondary battery, based on the first open-circuit voltage of the secondary battery fully charged. The state-of-charge estimating part estimates the state of charge corresponding to a second open-circuit voltage after estimating the first open-circuit voltage, based on the selected map.

## Claims

### Claim 1

A state-of-charge estimating device comprising:
an open-circuit voltage estimating part that estimates an open-circuit voltage of a secondary battery;
a map selecting part that selects a map indicating a relationship between a first open-circuit voltage and a state of charge of the secondary battery, based on the first open-circuit voltage of the secondary battery fully charged; and
a state-of-charge estimating part that estimates the state of charge corresponding to a second open-circuit voltage after estimating the first open-circuit voltage, based on the selected map.

### Claim 2 (depends on 1)

The state-of-charge estimating device according to claim 1, wherein
the map selecting part estimates a factor of degradation of the secondary battery, based on the first open-circuit voltage.

### Claim 3 (depends on 2)

The state-of-charge estimating device according to claim 2, wherein
the secondary battery is a lead-acid battery, and
the factor of degradation includes dry-out or grid corrosion, and sulfation.

### Claim 4 (depends on 1)

The state-of-charge estimating device according to claim 1, wherein
the state-of-charge calculating part calculates the state-of-charge after a lapse of a predetermined time from stopping of charge or discharge of the secondary battery.

### Claim 5 (depends on 1)

The state-of-charge estimating device according to claim 1, wherein
the state-of-charge estimating device is mounted in an electric vehicle.

### Claim 6

A state-of-charge determining method comprising the steps of:
estimating an open-circuit voltage of a secondary battery;
selecting a map indicating a relationship between a first open-circuit voltage and a state of charge of the secondary battery, based on the first open-circuit voltage of the secondary battery fully charged; and
estimating the state of charge corresponding to a second open-circuit voltage after estimating the first open-circuit voltage, based on the selected map.

### Claim 7

A state-of-charge determining program that causes a computer to execute the steps of:
estimating an open-circuit voltage of a secondary battery;
selecting a map indicating a relationship between a first open-circuit voltage and a state of charge of the secondary battery, based on the first open-circuit voltage of the secondary battery fully charged; and
estimating the state of charge corresponding to a second open-circuit voltage after estimating the first open-circuit voltage, based on the selected map.