# US 10,500,970 B2 · Power supply apparatus, transport device including power supply apparatus, estimating method of estimating correlation information between charge rate and open-end voltage of electric storage section, and computer readable medium for estimating correlation information

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- Number: US 10,500,970 B2
- Document ID: US10500970B2
- Status: Granted
- Kind: B2
- Application number: 15/470,932
- Filed: 2017-03-28
- Published: 2017-10-05
- Granted: 2019-12-10
- Earliest claimed: 2016-03-30
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Masayuki Kawamura; Hajime Fujita
- Web page: https://patentgrep.com/patent/US10500970B2

## CPC

- B60L 58/13: Maintaining the SoC within a determined range
- 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)
- H01M 16/00: Structural combinations of different types of electrochemical generators
- H02J 7/50: acting upon multiple batteries simultaneously or sequentially
- H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs
- H02J 7/82: Control of state of charge [SOC]
- H02J 7/84: Control of state of health [SOH]
- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power supply apparatus includes a first and second electric storage sections, a charge/discharge circuit performing charge/discharge between the first and second storage sections, and a control section controlling the charge/discharge circuit. The control section sets at least one of the first and second storage sections as a target storage section, acquires a target SOC and a target OCV which are respectively a charge rate and an open-end voltage of the target storage section, collects, by using charge transfer between the first and second storage sections, data including the target SOC and the target OCV in an order based on a collection rule determined by collected data and the target SOC, the collected data being an aggregation of the data which is collected, and estimates correlation information between an SOC and an OCV of the target storage section based on a plurality of the data.

## Claims

### Claim 1

A power supply apparatus, comprising:
a first electric storage section;
a second electric storage section;
a charge/discharge circuit which performs charge/discharge between the first electric storage section and the second electric storage section; and
a computer which controls the charge/discharge circuit,
wherein the computer sets at least one of the first electric storage section and the second electric storage section as a target electric storage section,
acquires
a target SOC, which is a charge rate of the target electric storage section, and
a target OCV, which is an open-end voltage of the target electric storage section,
collects, by using a charge transfer between the first electric storage section and the second electric storage section,
collected data including the target SOC and the target OCV in an order based on a collection rule determined by the collected data as it is collected during the charge transfer,
an operation time including an acquisition time which is a time required for acquiring the target SOC and the target OCV, and the target SOC,
the collected data being an aggregation of the data which is collected, and
estimates correlation information between an SOC and an OCV of the target electric storage section based on a plurality of the data.

### Claim 2 (depends on 1)

The power supply apparatus according to claim 1,
wherein the computer derives uncollected data which is an aggregation of the data that is uncollected based on the collected data, and
collects the data in an order based on the collection rule determined based on an operation time including a time required for the charge transfer,
the operation time calculated from a difference between an SOC included in the uncollected data and the target SOC.

### Claim 3 (depends on 2)

The power supply apparatus according to claim 2,
wherein the computer controls the charge/discharge circuit to collect the data by giving a higher priority to an SOC included in the uncollected data from which a shorter operation time is calculated.

### Claim 4 (depends on 1)

The power supply apparatus according to claim 1,
wherein the acquisition time includes a time required until a temporal change of voltage of the target electric storage section becomes stable after the charge transfer.

### Claim 5 (depends on 1)

The power supply apparatus according to claim 1,
wherein the acquisition time is based on a difference between a number of the data which is to be collected for each SOC and a number of the data which is included in the collected data and is already collected with respect to the target SOC.

### Claim 6 (depends on 5)

The power supply apparatus according to claim 5, wherein
the number of the data which is to be collected for each SOC is two or more.

### Claim 7 (depends on 2)

The power supply apparatus according to claim 2,
wherein the computer derives uncollected data which is an aggregation of the data that is uncollected based on the collected data, and
selects with higher priority the order in which a total value of the operation time for collecting each data of the uncollected data becomes smaller.

### Claim 8 (depends on 1)

The power supply apparatus according to claim 1,
wherein the computer acquires the target SOC based on a charge transfer amount to the target electric storage section since a time when an SOC of the target electric storage section is included in a range of a reference SOC which is an SOC or since a time when an OCV of the target electric storage section is included in a range of a reference OCV which is an OCV corresponding to the reference SOC,
wherein in the reference SOC, a difference of OCVs, with respective to the same SOC in a plurality of degradation states of the target electric storage section, is not more than a threshold.

### Claim 9 (depends on 1)

The power supply apparatus according to claim 1,
wherein the computer collects the data such that a reference SOC which is an SOC in which a difference of OCVs, with respect to the same SOC in a plurality of degradation states of the target electric storage section, is not more than a threshold, and
a reference OCV which is an OCV corresponding to the reference SOC are included as the target SOC and the target OCV respectively.

### Claim 10 (depends on 8)

The power supply apparatus according to claim 8,
wherein if an SOC of the target electric storage section before performing the charge transfer is not included in the range of the reference SOC, or if an OCV of the target electric storage section before performing the charge transfer is not included in the range of the reference OCV, the computer performs, prior to the charge transfer, charge/discharge between the first electric storage section and the second electric storage section such that the SOC of the target electric storage section is included in the range of the reference SOC or the OCV of the target electric storage section is included in the range of the reference OCV.

### Claim 11 (depends on 1)

The power supply apparatus according to claim 1,
wherein the computer includes a storage section which prestores correlation information between SOCs and OCVs in a plurality of degradation states of at least one of the first electric storage section and the second electric storage section, and
the computer selects with higher priority as the estimated correlation information, correlation information having a higher adaptability for the plurality of the data including the target SOC and the target OCV among the correlation information, stored by the storage section, between the SOCs and the OCVs in the plurality of degradation states of the target electric storage section.

### Claim 12 (depends on 1)

The power supply apparatus according to claim 1,
wherein the computer estimates the correlation information based on an approximate curve or an approximate straight line with respect to the plurality of the data including the target SOC and the target OCV.

### Claim 13 (depends on 1)

The power supply apparatus according to claim 1,
wherein at least one of the first electric storage section and the second electric storage section supplies power to a driving section,
the charge/discharge circuit performs charge/discharge among the first electric storage section, the second electric storage section, and the driving section, and
the computer controls, while performing the charge transfer, the charge/discharge circuit so as not to perform a charge/discharge between the first electric storage section and the driving section, and between the second electric storage section and the driving section.

### Claim 14 (depends on 1)

The power supply apparatus according to claim 1,
wherein when an inquiry about an SOC of the first electric storage section is received, the computer calculates an SOC of the first electric storage section based on an OCV of the first electric storage section and the estimated correlation information to respond.

### Claim 15 (depends on 1)

The power supply apparatus according to claim 1, wherein
the first electric storage section has a poor energy density and an excellent output density, compared with the second electric storage section.

### Claim 16 (depends on 15)

The power supply apparatus according to claim 15,
wherein when the first electric storage section and the second electric storage section are selected as the target electric storage section, the computer estimates with priority the correlation information of the first electric storage section.

### Claim 17 (depends on 1)

A transport device comprising the power supply apparatus according to claim 1.

### Claim 18

An estimating method of estimating correlation information between an SOC and an OCV which are respectively a charge rate and an open-end voltage of a power supply apparatus, the power supply apparatus including:
a first electric storage section;
a second electric storage section; and
a charge/discharge circuit which performs charge/discharge between the first electric storage section and the second electric storage section,
wherein the estimating method comprises:
setting at least one of the first electric storage section and the second electric storage section as a target electric storage section,
acquiring
a target SOC, which is an SOC of the target electric storage section, and
a target OCV, which is an OCV of the target electric storage section,
collecting, by using a charge transfer between the first electric storage section and the second electric storage section,
collected data including the target SOC and the target OCV in an order based on a collection rule determined by the collected data as it is collected during the charge transfer,
an operation time including an acquisition time which is a time required for acquiring the target SOC and the target OCV, and the target SOC,
the collected data being an aggregation of the data which is collected, and
estimating correlation information between an SOC and an OCV of the target electric storage section based on a plurality of the data.

### Claim 19

A non-transitory computer readable medium storing a program for estimating correlation information between an SOC and an OCV which are respectively a charge rate and an open-end voltage of a power supply apparatus, the power supply apparatus including:
a first electric storage section;
a second electric storage section; and
a charge/discharge circuit which performs charge/discharge between the first electric storage section and the second electric storage section,
wherein the program causes a computer to execute:
setting at least one of the first electric storage section and the second electric storage section as a target electric storage section,
acquiring a target SOC and a target OCV which are respectively an SOC and an OCV of the target electric storage section,
collecting, by using a charge transfer between the first electric storage section and the second electric storage section,
collected data including the target SOC and the target OCV in an order based on a collection rule determined by the collected data as it is collected the during the charge transfer,
an operation time including an acquisition time which is a time required for acquiring the target SOC and the target OCV, and
the target SOC,
the collected data being an aggregation of the data which is collected, and estimating correlation information between an SOC and an OCV of the target electric storage section based on a plurality of the data.