Pouch Type Case And Battery Pack Including The Same

Patent metadata

Field	Value
Publication number	US-2021351463-A1
Application number	US-202117355913-A
Country	US
Kind code	A1
Filing date	Jun 23, 2021
Priority date	Mar 19, 2010
Publication date	Nov 11, 2021
Grant date	—

Abstract

The present invention relates to a pouch type case having trimming portions formed on both sides or four corners thereof and a battery pack including the same. The trimming portions are formed on the corners of the pouch type case such that the trimming portions are indented toward an electrode assembly accommodating part to reduce a unit area so as to increase pressure applied to unit cells when a battery pack is assembled, thereby facilitating assembling of the battery pack and increasing cell capacity per unit area. Furthermore, the unit cells can be fixed in the battery pack more stably. The pouch type case reduces the unit area so as to include a relatively large number of cells for pressure applied to the cells when the battery pack is assembled to thereby increase the cell capacity.

First claim

1 . A secondary battery comprising:
an electrode assembly including electrode leads projected in a first direction; and a pouch type case comprising a space for accommodating the electrode assembly, and a sealing part sealing up an upper case and a lower case, wherein a portion of the space and sealing part includes trimming portions intended toward the electrode assembly, wherein the trimming portions include: a first trimming portion disposed between electrode leads; and a pair of second trimming portions disposed on opposite sides to each other with respect to the electrode leads, and respectively disposed adjacent to a corner of the electrode assembly, and wherein, in the first direction, a distance between the second trimming portion and the electrode assembly is greater than or equal to a distance between the first trimming portion and the electrode assembly.

2 . The secondary battery of claim 1 , wherein the second trimming portion defines a corner of the pouch type case.

3 . (canceled)

4 . The secondary battery of claim 1 , wherein the trimming portion has one of circular, oval, straight-line, rectangular, triangular, parabola and V shapes.

5 . The secondary battery of claim 1 , wherein the pair of second trimming portions have shapes symmetrical to each other.

6 - 13 . (canceled)

14 . The secondary battery of claim 1 , wherein the first trimming portion is formed in a parabola shape having a vertex corresponding to a point spaced apart from the electrode assembly by at least 3 mm.

15 . The secondary batter of claim 1 , wherein the first trimming portion is formed in an inverted triangle having a vertex corresponding to a point spaced apart from the electrode assembly by at least 3 mm.

16 . (canceled)

17 . (canceled)

18 . The secondary battery of claim 1 , wherein at least one side of the upper case and at least one side of the lower case are connected to each other.

19 . The secondary battery of claim 1 , wherein the upper case and the lower case are separated from each other and respectively have spaces accommodating the electrode assembly.

20 . A battery pack comprising the secondary battery according to claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Park Hyo Seok
• Shin Young Joon
• Park Hyun Woo

Classifications

• H01M10/0583 Primary

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title