Battery Case for Secondary Battery and Pouch Type Secondary Battery

Patent metadata

Field	Value
Publication number	US-2022209335-A1
Application number	US-202017606953-A
Country	US
Kind code	A1
Filing date	Mar 31, 2020
Priority date	May 31, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

A pouch type battery case for a secondary battery, which accommodates an electrode assembly, in which electrodes and separators are stacked, includes a first cup part and a second cup part, which are recessed in a pouch film, respectively; an accommodation part, which is provided in a longitudinal direction of edges of the first cup part and the second cup part, which face each other, between the first cup part and the second cup part and in which one side of the electrode assembly is configured to be accommodated; inclined parts extending from opposing ends, respectively, of the accommodation part and provided to be recessed in the pouch film; and line forming parts extending linearly from outer ends, respectively, of the respective inclined parts and provided to be recessed in the pouch film in the same direction as the longitudinal direction of the accommodation part.

First claim

1 . A pouch type battery case for a secondary battery, which accommodates an electrode assembly, in which electrodes and separators are stacked, the battery case comprising:
a first cup part and a second cup part, which are recessed in a pouch film, respectively; an accommodation part, which is provided in a longitudinal direction of edges of the first cup part and the second cup part, which face each other, between the first cup part and the second cup part and in which one side of the electrode assembly is configured to be accommodated; inclined parts extending from opposing ends, respectively, of the accommodation part and provided to be recessed in the pouch film; and line forming parts extending linearly from outer ends, respectively, of the respective inclined parts and provided to be recessed in the pouch film in the same direction as the longitudinal direction of the accommodation part.

2 . The pouch type battery case of claim 1 , wherein, in each inclined part, a ratio of a height up to the outer end to a length of an edge shared with an edge of one end of the accommodation part is greater than 0.25.

3 . The pouch type battery case of claim 2 , wherein, in each inclined part, the ratio of the height up to the outer end to the length of the edge shared with the edge of the one end of the accommodation part is less than 0.6.

4 . The pouch type battery case of claim 1 , wherein each inclined part has a polygonal shape.

5 . The pouch type battery case of claim 4 , wherein each inclined part has a triangular or trapezoidal shape.

6 . The pouch type battery case of claim 5 , wherein each inclined part is recessed in an isosceles triangular shape.

7 . The pouch type battery case of claim 4 , wherein, in each inclined part, a vertex of the polygonal shape is chamfered or filleted.

8 . The pouch type battery case of claim 1 , wherein each inclined part has a depth that gradually decreases from the accommodation part to the line forming part.

9 . The pouch type battery case of claim 1 , wherein each line forming part is recessed up to an edge of one side of the pouch film.

10 . The pouch type battery case of claim 1 , wherein each line forming part is recessed in a V shape.

11 . The pouch type battery case of claim 1 , wherein each line forming part is recessed in a U shape.

12 . The pouch type battery case of claim 1 , wherein the accommodation part, the inclined parts, and the line forming parts are formed together through one drawing process.

13 . A pouch type secondary battery comprising:
an electrode assembly, in which electrodes and separators are stacked; and a battery case configured to accommodate the electrode assembly therein, wherein the battery case comprises: a first cup part and a second cup part, which are recessed in a pouch film, respectively; an accommodation part, which is provided in a longitudinal direction of edges of the first cup part and the second cup part, which face each other, between the first cup part and the second cup part and in which one side of the electrode assembly is accommodated; inclined parts extending from opposing ends, respectively, of the accommodation part and provided to be recessed in the pouch film; and line forming parts extending linearly from outer ends, respectively, of the respective inclined parts and provided to be recessed in the pouch film in the same direction as the longitudinal direction of the accommodation part.

14 . The pouch type secondary battery of claim 13 , wherein, in each inclined part, a ratio of a height up to the outer end to a length of an edge shared with an edge of one end of the accommodation part is greater than 0.25.

15 . The pouch type secondary battery of claim 14 , wherein, in each inclined part, the ratio of the height up to the outer end to the length of the edge shared with the edge of the one end of the accommodation part is less than 0.6.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Sang Kyun
• Park Min Soo
• Kim Young Ha
• Hong Young Hoon
• Kim Seong Hyun
• Hong Eui Jin

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M50/124

  having a layered structure · CPC title

• H01M50/131

  characterised by physical properties, e.g. gas permeability, size or heat resistance · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M10/0459

  Cells or batteries with folded separator between plate-like electrodes · CPC title