# US 9,000,612 B2 · Energy storage system

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- Number: US 9,000,612 B2
- Document ID: US9000612B2
- Status: Granted
- Kind: B2
- Application number: 12/961,324
- Filed: 2010-12-06
- Published: 2011-06-09
- Granted: 2015-04-07
- Earliest claimed: 2009-12-04
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Jungjin Choi
- Inventors: Jungjin Choi
- Web page: https://patentgrep.com/patent/US9000612B2

## CPC

- H02J 7/35: with light sensitive cells
- H02J 3/381: {Dispersed generators}
- H02J 3/46: Controlling the sharing of generated power between the generators, sources or networks
- H02M 3/1582: {Buck-boost converters (H02M3/1584 takes precedence)}
- H02J 2101/24: Photovoltaics
- Y02E 10/56: Power conversion systems, e.g. maximum power point trackers
- Y02P 90/50: Energy storage in industry with an added climate change mitigation effect
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

An energy storage system is disclosed. The system can supply DC power from a battery to a DC load or from the DC load to the battery without inverting an AC power to the DC power.

## Claims

### Claim 1

An energy storage system comprising:
a first battery;
a bi-directional converter connected to the first battery, wherein the bi-directional converter is configured to convert the power from the first battery into a first DC power;
an integration controller connected to the bi-directional converter, wherein the integration controller is configured to select a discharge mode and a charge mode for the first battery so as to control discharge and charge of the first battery;
a second battery;
a DC load connected to the bi-directional converter and the second battery, wherein the DC load receives power from the first battery through the bi-directional converter when the first battery is in the discharge mode, and power of the second battery is converted into a second DC power by the bi-directional converter and the second DC power is supplied to the first battery when the first battery is in the charge mode, and the bi-directional converter includes a plug for connecting and disconnecting the DC load
wherein the bi-directional converter further comprises a coil connected between a first terminal of the first battery and a first external terminal of the bi-directional converter; a first switch comprising a first terminal connected to the coil, and a second terminal connected to the first external terminal of the bi-directional converter; and a second switch comprising a first terminal connected to a second terminal of the first battery and to a second external terminal of the bi-directional converter, and a second terminal connected to the coil and to the first switch; and
the bi-directional converter boosts the power of the first battery when a duty ratio of the first and second switches is equal to or greater than a certain value and the first battery is in the discharge mode, and
the bi-directional converter drops the power of the first battery when the duty ratio of the first and second switches is less than the value and the first battery is in the discharge mode.

### Claim 2

An energy storage system comprising:
a first battery;
a bi-directional converter connected to the first battery, wherein the bi-directional converter is configured to convert the power from the first battery into a first DC power;
an integration controller connected to the bi-directional converter, wherein the integration controller is configured to select a discharge mode and a charge mode for the first battery so as to control discharge and charge of the first battery;
a second battery;
a DC load connected to the bi-directional converter and the second battery, wherein the DC load receives power from the first battery through the bi-directional converter when the first battery is in the discharge mode, and power of the second battery is converted into a second DC power by the bi-directional converter and the second DC power is supplied to the first battery when the first battery is in the charge mode, and the bi-directional converter includes a plug for connecting and disconnecting the DC load
wherein the bi-directional converter further comprises a coil connected between a first terminal of the first battery and a first external terminal of the bi-directional converter; a first switch comprising a first terminal connected to the coil, and a second terminal connected to the first external terminal of the bi-directional converter; and a second switch comprising a first terminal connected to a second terminal of the first battery and to a second external terminal of the bi-directional converter, and a second terminal connected to the coil and to the first switch; and
the bi-directional converter boosts the power of the second battery when a duty ratio of the first and second switches is equal to or greater than a certain value and the first battery is in the charge mode, and
the bi-directional converter drops the power of the second battery when the duty ratio of the first and second switches is less than the value and the first battery is in the charge mode.