POUCH-TYPE BATTERY

• US 20090311592A1
• Filed: 04/07/2007
• Published: 12/17/2009
• Est. Priority Date: 04/17/2006
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Min Su, You, Seungjae
• Granted Patent: US 8,501,343 B2
• Time in Patent Office: Days
• US Class Current: 429/162
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/609 Arrangements or processes for filling with liquid, e.g. electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed herein is a pouch-type battery including a cathode and an anode protruding from opposite sides of a battery case in opposite directions, wherein the pouch-type battery is constructed in a structure in which two receiving parts are formed at a one-unit sheet-type battery case in a symmetrical fashion such that an electrode assembly is received in the receiving parts, the battery case is bent between the two receiving parts (along a bending line) such that one of the receiving parts overlaps with the other receiving part while the electrode assembly is received in the other receiving part, the bent battery case being scaled, the two receiving parts are continuously formed while the two receiving parts are in contact with the bending line, and the battery case is provided at the edge thereof where the bending line runs with bent depression parts having a depth equivalent to that of the receiving parts. The pouch-type battery is manufactured with a capacity equivalent to twice that of a conventional battery through a simple assembly process, and is constructed in a structure in which the battery case is prevented from breakage during the assembly process.

Claims

1. A pouch-type battery including a cathode and an anode protruding from opposite sides of a battery case in opposite directions, wherein the pouch-type battery is constructed in a structure in which two receiving parts are formed at a one-unit sheet-type battery case in a symmetrical fashion such that an electrode assembly is received in the receiving parts, the battery case is bent between the two receiving parts (along a bending line) such that one of the receiving parts overlaps with the other receiving part while the electrode assembly is received in the other receiving part, the bent battery case being sealed, the two receiving parts are continuously formed while the two receiving parts are in contact with the bending line, and the battery case is provided at the edge thereof where the bending line runs with bent depression parts having a depth equivalent to that of the receiving parts.

2. The battery according to claim 1, wherein the two receiving parts have the same depth.

3. The battery according to claim 1, wherein the battery case is made of a laminate sheet including a metal layer and a resin layer.

4. The battery according to claim 3, wherein the laminate sheet is an aluminum laminate sheet.

5. The battery according to claim 1, wherein the sheets outside the receiving parts opposite to the bending line extend such that the outside sheets have a relatively large length, and the battery is manufactured by receiving the electrode assembly in one of the receiving parts, bending the battery case along the bending line, sealing regions of the battery case excluding the extended outside sheets, injecting an electrolyte through the gap between the outside sheets, sealing the outside sheets, and cutting the sealed outside sheets into a predetermined size.

6. The battery according to claim 1, wherein the sealing is accomplished by thermal welding.

7. A medium- or large-sized battery module including a pouch-type battery according to claim 1 as a unit cell.

8. A medium- or large-sized battery module including a pouch-type battery according to claim 2 as a unit cell.

9. A medium- or large-sized battery module including a pouch-type battery according to claim 3 as a unit cell.

10. A medium- or large-sized battery module including a pouch-type battery according to claim 4 as a unit cell.

11. A medium- or large-sized battery module including a pouch-type battery according to claim 5 as a unit cell.

12. A medium- or large-sized battery module including a pouch-type battery according to claim 6 as a unit cell.