SECONDARY BATTERY, SECONDARY BATTERY MODULE, METHOD FOR CHARGING THE SECONDARY BATTERY AND THE SECONDARY BATTERY MODULE, METHOD FOR DISCHARGING THE SECONDARY BATTERY AND THE SECONDARY BATTERY MODULE, METHOD FOR OPERATING THE SECONDARY BATTERY AND THE SECONDARY BATTERY MODULE, POWER STORAGE SYSTEM, AND METHOD FOR OPERATING THE POWER STORAGE SYSTEM

• US 20140203654A1
• Filed: 01/16/2014
• Published: 07/24/2014
• Est. Priority Date: 01/21/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: TAKAHASHI, Kei, KOYAMA, Jun, HIROKI, Masaaki
• Granted Patent: US 10,044,182 B2
• Time in Patent Office: Days
• US Class Current: 307/82
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Degradation of a secondary battery or the like is prevented. A reduction in the capacity of a secondary battery or the like due to charging or discharging is prevented. A secondary battery module in which a secondary battery can be charged in a charging period into which short discharging periods are inserted is provided. A secondary battery module in which a plurality of secondary batteries are connected in parallel, and in a charging period of the secondary batteries, current due to short-time discharging of one secondary battery can be used for charging another secondary battery is provided. To carry out such operation, a secondary battery module includes a plurality of secondary batteries, a DC/DC converter, a switch, and a control circuit.

Claims

1. A secondary battery module comprising:

a first secondary battery and second secondary battery electrically connected to each other in parallel;

a DC/DC converter, wherein a first terminal of the DC/DC converter is electrically connected to a first electrode of the first secondary battery, and a second terminal of the DC/DC converter is electrically connected to a first electrode of the second secondary battery;

a first switch, wherein a first terminal of the first switch is electrically connected to the first terminal of the DC/DC converter;

a second switch, wherein a first terminal of the second switch is electrically connected to the second terminal of the DC/DC converter; and

a control circuit configured to control the DC/DC converter, the first switch, and the second switch.

2. The secondary battery module according to claim 1,

wherein each of the first secondary battery and the second secondary battery includes a plurality of secondary battery cells, and

wherein the plurality of secondary battery cells are electrically connected to each other in series.

3. The secondary battery module according to claim 2, further comprising:

a protection circuit and a current detector electrically connected to the plurality of secondary battery cells.

4. A secondary battery module comprising:

a first secondary battery and a second secondary battery electrically connected to each other in parallel;

a first DC/DC converter, wherein a first terminal of the first DC/DC converter is electrically connected to a first electrode of the first secondary battery, and a second terminal of the first DC/DC converter is electrically connected to a first electrode of the second secondary battery;

a second DC/DC converter, wherein a first terminal of the second DC/DC converter is electrically connected to the first electrode of the first secondary battery, and a second terminal of the second DC/DC converter is electrically connected to the first electrode of the second secondary battery;

a first switch, wherein a first terminal of the first switch is electrically connected to the first terminal of the first DC/DC converter and the first terminal of the second DC/DC converter;

a second switch, wherein a first terminal of the second switch is electrically connected to the second terminal of the first DC/DC converter and the second terminal of the second DC/DC converter; and

a control circuit configured to control the first DC/DC converter, the second DC/DC converter, the first switch, and the second switch.

5. The secondary battery module according to claim 4,

wherein each of the first secondary battery and the second secondary battery includes a plurality of secondary battery cells, and

wherein the plurality of secondary battery cells are electrically connected to each other in series.

6. The secondary battery module according to claim 5, further comprising:

a protection circuit and a current detector electrically connected to the plurality of secondary battery cells.

7. A secondary battery module comprising:

a first secondary battery and a second secondary battery electrically connected to each other in parallel;

a DC/DC converter, wherein a first terminal of the DC/DC converter is electrically connected to a first electrode of the first secondary battery, and a second terminal of the DC/DC converter is electrically connected to a first electrode of the second secondary battery;

an input terminal;

an output terminal;

a first switch, wherein a first terminal of the first switch is electrically connected to the first terminal of the DC/DC converter, and a second terminal of the first switch is electrically connected to the input terminal;

a second switch, wherein a first terminal of the second switch is electrically connected to the second terminal of the DC/DC converter, and a second terminal of the second switch is electrically connected to the input terminal;

a third switch, wherein a first terminal of the third switch is electrically connected to the first terminal of the DC/DC converter, and a second terminal of the third switch is electrically connected to the output terminal;

a fourth switch, wherein a first terminal of the fourth switch is electrically connected to the second terminal of the DC/DC converter, and a second terminal of the fourth switch is electrically connected to the output terminal; and

a control circuit configured to control the DC/DC converter, the first switch, the second switch, the third switch, and the fourth switch.

8. The secondary battery module according to claim 7,

wherein each of the first secondary battery and the second secondary battery includes a plurality of secondary battery cells, and

wherein the plurality of secondary battery cells are electrically connected to each other in series.

9. The secondary battery module according to claim 8, further comprising:

a protection circuit and a current detector electrically connected to the plurality of secondary battery cells.