# US 8,541,123 B2 · Secondary battery, battery assembly, and vehicle equipped with the secondary battery

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- Number: US 8,541,123 B2
- Document ID: US8541123B2
- Status: Granted
- Kind: B2
- Application number: 12/632,842
- Filed: 2009-12-08
- Published: 2010-06-17
- Granted: 2013-09-24
- Earliest claimed: 2008-12-16
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Noriyuki Maruyama; Yuta Nemoto
- Inventors: Noriyuki Maruyama; Yuta Nemoto
- Web page: https://patentgrep.com/patent/US8541123B2

## CPC

- H01M 10/02: Details (of electrodes H01M4/00; of non-active parts H01M50/00)
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/0481: {Compression means other than compression means for stacks of electrodes and separators}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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

A secondary battery comprises a flat wound electrode body, a flat-type hard case housing the wound electrode body, and a film sandwiched between them. The film is formed with thick portions each of which is located at a boundary region between a flat portion and a curved portion of the surface of the wound electrode body. When a plurality of the secondary batteries are bound, therefore, load is applied widely on almost the entire wound electrode body, thereby enabling exertion of sufficient generation capability. Thus, a secondary battery with improved battery performance is provided in which load is sufficiently applied on an electrode body. The secondary battery can also be used as a battery assembly, a battery to be mounted on a vehicle, and a battery to be mounted on a battery mounting device.

## Claims

### Claim 1

A secondary battery comprising:
an electrode body;
a flat case that houses the electrode body;
a compressing member that is a thick portion located between an inner surface of the case and the electrode body and presses part of a surface of the electrode body; and
a film sandwiched between the inner surface of the flat case and the electrode body, wherein the film is partly formed with the thick portion thicker than other portions of the film,
wherein the surface of the electrode body includes a flat portion and a curved portion, and the compressing member is located at a boundary region between the flat portion and the curved portion of the surface of the electrode body.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, wherein
the electrode body is a wound electrode body formed of electrode sheets wound in flat form.

### Claim 3

A battery assembly comprising a plurality of secondary batteries each including
an electrode body,
a flat case that houses the electrode body,
a pressing member that presses the secondary batteries from outside, the secondary batteries being assembled and pressed in a direction of thickness of the electrode bodies by the pressing member,
wherein at least one of the secondary batteries includes a compressing member that is a thick portion located between an inner surface of the flat case and the electrode body and compresses part of the surface of the electrode body, and
a film sandwiched between the inner surface of the flat case and the electrode body, wherein the film is partly formed with the thick portion thicker than other portions of the film,
wherein the surface of the electrode body includes a flat portion and a curved portion, and the compressing member is located at a boundary region between the flat portion and the curved portion of the surface of the electrode body.

### Claim 4

A vehicle equipped with a secondary battery, the secondary battery comprising:
an electrode body;
a flat case that houses the electrode body;
a compressing member that is a thick portion placed between an inner surface of the case and the electrode body and compresses part of a surface of the electrode body; and
a film sandwiched between the inner surface of the flat case and the electrode body, wherein the film is partly formed with the thick portion thicker than other portions of the film,
wherein the surface of the electrode body includes a flat portion and a curved portion, and the compressing member is located at a boundary region between the flat portion and the curved portion of the surface of the electrode body.