# US 2017/0285109 A1 · 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 2017/0285109 A1
- Document ID: US20170285109A1
- Status: Published application
- Kind: A1
- Application number: 15/470,902
- Filed: 2017-03-27
- Published: 2017-10-05
- 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/US20170285109A1

## CPC

- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- B60L 50/51: characterised by AC-motors
- B60L 58/12: responding to state of charge [SoC]
- B60L 58/20: having different nominal voltages
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- H02J 1/06: Two-wire DC power distribution systems
- H02J 1/082: DC supplies with two or more different DC voltage levels
- H02J 1/12: Parallel operation of DC sources having power converters with further DC sources without power converters
- H02J 7/1423: {with multiple batteries}
- H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence)
- H02J 7/445: {in response to measured battery parameters, e.g. voltage, current or temperature profile}
- H02J 7/448: {using switches, contacts or markings, e.g. optical, magnetic or barcode}
- H02J 7/485: {with provisions for charging different types of batteries}
- H02J 7/50: acting upon multiple batteries simultaneously or sequentially
- H02J 7/82: Control of state of charge [SOC]
- B60L 2210/30: AC to DC converters
- B60L 2210/40: DC to AC converters
- H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones
- H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV]
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/72: Electric energy management in electromobility
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- 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
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power supply apparatus has a first electric storage section, a second electric storage section having an excellent energy density and a poor output density compared with the first storage section, and a control section that acquires first data and second data before and after each time of transferring charge between the first and storage sections, the first data being a combination of an SOC and an OCV of the first storage section, the second data being a combination of an SOC and an OCV of the second storage section, estimates a first correlation between the SOC and the OCV of the first storage section from an aggregation of the first data including reference data, and estimates a second correlation between the SOC and the OCV of the second storage section based on a comparison between a plurality of stored data and an aggregation of the second data.

## Claims

### Claim 1

A power supply apparatus, comprising:
a first electric storage section;
a second electric storage section which has an excellent energy density and a poor output density compared with the first electric storage section; and
a circuit module which has a charge/discharge circuit that performs charge/discharge between the first electric storage section and the second electric storage section, and a control section that controls the charge/discharge circuit, wherein
the control section acquires first data and second data before and after each of a plurality of times of charge transfers between the first electric storage section and the second electric storage section, the first data being a combination of a first SOC and a first OCV that are respectively a charge rate and an open-end voltage of the first electric storage section, the second data being a combination of a second SOC and a second OCV that are respectively a charge rate and an open-end voltage of the second electric storage section,
performs a first operation of estimating a first correlation which is correlation information between an SOC and an OCV of the first electric storage section from an aggregation of the first data including reference data, and
performs a second operation of estimating a second correlation which is correlation information between an SOC and an OCV of the second electric storage section based on a comparison between a plurality of stored data stored by the control section and an aggregation of the second data.

### Claim 2 (depends on 1)

The power supply apparatus according to claim 1, wherein
the reference data is a first data which has a deviation of SOCs to the same OCV in a plurality of degradation states of the first electric storage section, the deviation not more than a threshold.

### Claim 3 (depends on 1)

The power supply apparatus according to claim 1, wherein
the control section stores a degradation state of the second electric storage section and the stored data, and associates the degradation state of the second electric storage section and the stored data with each other,
estimates a present degradation state of the second electric storage section, and
compares the aggregation of the second data with stored data only associated with a degradation state that progressed more than the present degradation state among the plurality of stored data.

### Claim 4 (depends on 3)

The power supply apparatus according to claim 3, wherein
the control section determines the present degradation state based on the estimated second correlation.

### Claim 5 (depends on 1)

The power supply apparatus according to claim 1, wherein
the control section selects stored data to be compared with a plurality of aggregations of the second data among the plurality of stored data based on an accumulated value of currents charged/discharged by the second electric storage section from a time when the second correlation was estimated last time.

### Claim 6 (depends on 5)

The power supply apparatus according to claim 5, wherein
the control section selects the stored data to be compared with a plurality of aggregations of the second data by excluding the stored data associated with a degradation state which progressed more than a degradation state corresponding to the accumulated value of currents by a predetermined value or more.

### Claim 7 (depends on 1)

The power supply apparatus according to claim 1, wherein
the control section generates the first correlation based on an approximate curve or an approximate straight line of the aggregation of the first data.

### Claim 8 (depends on 7)

The power supply apparatus according to claim 7, wherein
the control section generates the second correlation by selecting with higher priority stored data having a higher adaptability to the aggregation of the second data among the plurality of stored data.

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 9)

The power supply apparatus according to claim 9, wherein
if the SOC of the first electric storage section is not included in the range of the reference SOC before performing the charge transfer, or if the OCV of the first electric storage section is not included in the range of the reference OCV before performing the charge transfer,
the control section 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 first electric storage section is included in the range of the reference SOC or the OCV of the first 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
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 control section controls the charge/discharge circuit so as not to perform the charge/discharge between the first electric storage section and the driving section and between the second electric storage section and the driving section during the charge transfer.

### Claim 12 (depends on 1)

The power supply apparatus according to claim 1, wherein
the control section calculates the SOC of the first electric storage section to respond based on the OCV of the first electric storage section and the first correlation when receiving an inquiry about the SOC of the first electric storage section, and calculates the SOC of the second electric storage section to respond based on the OCV of the second electric storage section and the second correlation when receiving an inquiry about the SOC of the second electric storage section.

### Claim 13 (depends on 1)

The power supply apparatus according to claim 1, wherein
the second electric storage section has a larger battery capacity compared with the first electric storage section.

### Claim 14 (depends on 2)

The power supply apparatus according to claim 2, wherein
the control section stores a degradation state of the second electric storage section and the stored data, and associates the degradation state of the second electric storage section and the stored data with each other,
estimates a present degradation state of the second electric storage section, and
compares the aggregation of the second data with stored data only associated with a degradation state which progressed more than the present degradation state among the plurality of stored data.

### Claim 15 (depends on 2)

The power supply apparatus according to claim 2, wherein
the control section selects stored data to be compared with a plurality of aggregations of the second data among the plurality of stored data based on an accumulated value of currents charged/discharged by the second electric storage section from a time when the second correlation was estimated last time.

### Claim 16 (depends on 15)

The power supply apparatus according to claim 15, wherein
the control section selects the stored data to be compared with a plurality of aggregations of the second data by excluding the stored data associated with a degradation state which progressed more than a degradation state corresponding to the accumulated value of currents by a predetermined value or more.

### Claim 17 (depends on 3)

The power supply apparatus according to claim 3, wherein
the control section selects stored data to be compared with a plurality of aggregations of the second data among the plurality of stored data based on an accumulated value of currents charged/discharged by the second electric storage section from a time when the second correlation was estimated last time.

### Claim 18 (depends on 1)

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

### Claim 19

An estimating method of estimating correlation information between an SOC and an OCV of a first electric storage section, the SOC and the OCV being respectively a charge rate and an open-end voltage, and correlation information between an SOC and an OCV of an second electric storage section in a power supply apparatus, the power supply apparatus having:
the first electric storage section;
the second electric storage section which has an excellent energy density and a poor output density compared with the first electric storage section; and
a circuit module which has a charge/discharge circuit that performs charge/discharge between the first electric storage section and the second electric storage section and a control section that controls the charge/discharge circuit, wherein
the estimating method comprises:
acquiring first data and second data before and after each of a plurality of times of charge transfers between the first electric storage section and the second electric storage section, the first data being a combination of a first SOC and a first OCV that are the SOC and the OCV of the first electric storage section, the second data being a combination of a second SOC and a second OCV that are the SOC and the OCV of the second electric storage section,
performing a first operation of estimating a first correlation which is the correlation information between the SOC and the OCV of the first electric storage section from an aggregation of the first data including reference data, and
performing a second operation of estimating a second correlation which is the correlation information between the SOC and the OCV of the second electric storage section based on a comparison between a plurality of stored data stored by the control section and an aggregation of the second data.

### Claim 20

A non-transitory computer readable medium storing a program for estimating correlation information between an SOC and OCV of a first electric storage section, the SOC and the OCV being respectively a charge rate and an open-end voltage, and correlation information between an SOC and OCV of a second electric storage section in a power supply apparatus, the power supply apparatus having:
the first electric storage section;
the second electric storage section which has an excellent energy density and a poor output density compared with the first electric storage section; and
a circuit module which has a charge/discharge circuit that performs charge/discharge between the first electric storage section and the second electric storage section and a control section that controls the charge/discharge circuit, wherein
the program causes a computer to execute:
acquiring first data and second data before and after each of a plurality of times of charge transfers between the first electric storage section and the second electric storage section, the first data being a combination of a first SOC and a first OCV that are the SOC and the OCV of the first electric storage section, the second data being a combination of a second SOC and a second OCV that are the SOC and the OCV of the second electric storage section,
performing a first operation of estimating a first correlation which is the correlation information between the SOC and the OCV of the first electric storage section from an aggregation of the first data including reference data, and
performing a second operation of estimating a second correlation which is the correlation information between the SOC and the OCV of the second electric storage section based on a comparison between a plurality of stored data stored by the control section and an aggregation of the second electric storage section.