PACKAGED BATTERY, STACKED BATTERY ASSEMBLY, AND FILM-COVERED BATTERY

• US 20140205869A1
• Filed: 03/21/2014
• Published: 07/24/2014
• Est. Priority Date: 02/21/2007
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: MIZUTA, Masatomo, OTOHATA, Makihiro, YAGETA, Hiroshi, UTSUMI, Kazuaki
• Granted Patent: US 9,653,715 B2
• Time in Patent Office: Days
• US Class Current: 429/53
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/186 characterised by the disposition of the sealing members
• CPC Class Codes: H01M 50/211 adapted for pouch cells
• CPC Class Codes: H01M 50/325 comprising deformable valve members, e.g. elastic or flexible valve members
• CPC Class Codes: H01M 50/3425 in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: H01M 50/578 in response to pressure
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A packaged battery, an assembled battery, and a film-covered battery, which can prevent a dangerous state involving a high-pressure gas filled in the film-covered battery while ensuring a sealing reliability, are provided. The Packaged battery includes film-covered battery 1 including a battery element and exterior films forming a sealed space housing the battery element, and holding member 10 holding film-covered battery 1. The sealed space includes a housing section housing the battery element, and a pocket communicating with the housing section to expand when the pressure in the sealed space increases. The pocket includes a safety valve which activates when the pocket expands. Holding member 10 includes an opening and a cavity fitting the housing section therein. When the housing section is fitted into the cavity, at least part of the pocket and the safety valve protrude to the outside of the holding member from the opening.

Claims

1. A film-covered battery including a battery element, and exterior films which form a sealed space which fits said battery element therein, said sealed space including a housing section which houses said battery element therein, and a pocket being folded or wound, said pocket communicating with said housing section, said pocket being composed of fusion-bonded film overhang and of fusion-bonding free area that is surrounded by said fusion-bonded film overhang, said pocket including a safety valve which passes through said external films.

2. The film-covered battery according to claim 1, wherein, said pocket is unfolded or unwound due to an increase in the inner pressure such that said safety valve protrudes.

3. The film-covered battery according to claim 1, wherein, in a situation in which said film-covered battery is held in a holding member that includes an opening or a notch, said pocket is unfolded or unwound due to an increase in the inner pressure such that at least part of said pocket and said safety valve protrude to the outside of said holding member from said opening or said notch.

4. The film-covered battery according to claim 1, wherein said film-covered battery is stacked on another film-covered battery that has a structure that is identical with a structure of said film covered battery, and said pocket is unfolded or unwound due to an increase in the inner pressure such that at least part of said pocket and said safety valve protrude to the outside of the contour of said film-covered battery.

5. The film-covered battery according to claim 1, wherein said pocket is positioned in a central zone of a longer side of said housing section.

6. The film-covered battery according to claim 1, wherein said pocket is biased toward one pole of the film-covered battery.

7. The film-covered battery according to claim 3, wherein, in a situation in which said film-covered battery is held in said holding member, said notch is opposite to said safety valve.

8. The film-covered battery according to claim 1, wherein said film-covered battery is stacked on another film-covered battery such that a side, on which said pocket and opening of said film-covered batter are positioned, is opposite to a side on which a pocket and opening of said another film-covered battery are positioned.

9. The film-covered battery according to claim 1, wherein said pocket is folded from its root or is folded near its center.

10. The film-covered battery according to claim 1, wherein a needle is provided instead of said safety valve, said needle being positioned such that when said pocket expands, a surface of said pocket reaches said needle.