# US 2014/0191576 A1 · Electric storage system

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- Number: US 2014/0191576 A1
- Document ID: US20140191576A1
- Status: Published application
- Kind: A1
- Application number: 14/122,616
- Filed: 2012-05-25
- Published: 2014-07-10
- Earliest claimed: 2011-06-01
- Assignees: Hitachi, Ltd.
- Inventors: Mitsutoshi Honda; Masahiro Iwamura; Motoo Futami; Hiroyuki Shoji; Takeshi Inoue
- Web page: https://patentgrep.com/patent/US20140191576A1

## CPC

- H02J 1/102: being switching converters (H02J1/108, H02J1/12 take precedence)
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H02J 7/1423: {with multiple batteries}
- H02J 7/345: {using capacitors as storage or buffering devices}
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electric storage system includes at least two types of electric storage cells. A first electric storage unit is configured from a first electric storage cell, and a second electric storage unit is configured from a second electric storage cell. The first and second electric storage units are electrically connected to each other through a current controlling circuit.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

An electric storage system, comprising:
a first electric storage unit configured from a first electric storage cell;
a second electric storage unit configured from a second electric storage cell different in type from the first electric storage cell; and
a current controlling circuit provided between the first electric storage unit and the second electric storage unit, the current controlling circuit being electrically connected to the first and second electric storage units to control input/output current amounts to and from the first electric storage unit and the second electric storage unit;
wherein the current controlling circuit includes two switch circuits and allows the two switch circuits to provide switching control between on and off states to control the ratio of the input/output currents to and from the first electric storage unit and the second electric storage unit.

### Claim 8 (depends on 7)

The electric storage system according to claim 7, further comprising:
a third electric storage unit configured from a third electric storage cell different in type from the first and second electric storage cell; and
a second current controlling circuit provided between the second electric storage unit and the third electric storage unit, the second current controlling circuit being electrically connected to the second and third electric storage units to control input/output current amounts to and from the second electric storage unit and the third electric storage unit.

### Claim 9 (depends on 7)

The electric storage system according to claim 7, wherein
the current controlling circuit comprises a voltage adjustment circuit, the voltage adjustment circuit including one of either a step-up chopper, a step-down chopper, a step-up/down chopper, or a combination of a step-up chopper and a step-down chopper.

### Claim 10 (depends on 7)

The electric storage system according to claim 7, wherein
the current controlling circuit comprises an impedance adjustment circuit.

### Claim 11 (depends on 10)

The electric storage system according to claim 10, wherein
the impedance adjustment circuit is a coil.

### Claim 12 (depends on 8)

The electric storage system according to claim 8, wherein
the second current controlling circuit comprises a voltage adjustment circuit, the voltage adjustment circuit including one of either a step-up chopper, a step-down chopper, a step-up/down chopper, or a combination of a step-up chopper and a step-down chopper.

### Claim 13 (depends on 8)

The electric storage system according to claim 8, wherein
the current controlling circuit comprises an impedance adjustment circuit.

### Claim 14 (depends on 13)

The electric storage system according to claim 13, wherein
the impedance adjustment circuit is a coil.