Battery case for secondary battery and pouch type secondary battery

Patent metadata

Field	Value
Publication number	US-12476308-B2
Application number	US-202017434584-A
Country	US
Kind code	B2
Filing date	Mar 18, 2020
Priority date	Mar 29, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

To achieve the above objects, a battery case for a secondary battery, the battery case being a pouch type battery case that is configured to accommodate an electrode assembly therein, the electrode assembly including stacked electrodes and separators therein, the battery case according to an embodiment of the present invention including a first cup part and a second cup part, each formed as a respective recess extending downward from a top surface of a pouch film; a bridge formed between the first cup part and the second cup part and having a constant width and height; and two complement parts disposed outside of respective first and second longitudinal ends of the bridge, each of the complement parts protruding upward from the top surface of the pouch film.

First claim

The invention claimed is:

1 . A battery case for a secondary battery, the battery case being a pouch type battery case that is configured to accommodate an electrode assembly therein, the electrode assembly including stacked electrodes and separators therein, the battery case comprising:
a first cup part and a second cup part each formed as a respective recess extending downward from a top surface of a pouch film; a bridge formed between the first cup part and the second cup part and having a constant width and height; and two complement parts disposed outside of respective first and second longitudinal ends of the bridge, each of the complement parts protruding upward from the top surface of the pouch film, wherein each of the complement parts has a polyhedral shape of a constant solid volume, wherein each of the complement parts consists of a same material as a sealant layer that is an innermost layer of the pouch film, and wherein each of the complement parts is configured to protrude upward and downward relative to a plane of sealing parts of the pouch film that surround the complement parts.

2 . The battery case of claim 1 , wherein a central axis extending between the longitudinal ends of the bridge passes through each of the complement parts.

3 . The battery case of claim 2 , wherein each of the complement parts has a first width that is the same as a second width of the bridge.

4 . The battery case of claim 1 , wherein each of the complement parts is disposed at one side of the first cup part, and one edge of each of the complement parts is parallel to a central axis extending between the longitudinal ends of the bridge.

5 . The battery case of claim 4 , wherein each of the complement parts has a first height that is the same as a second height of the bridge.

6 . The battery case of claim 4 , wherein the one edge of each of the complement parts is disposed along a same straight line as one longitudinally-extending edge of the bridge.

7 . The battery case of claim 1 , wherein each of the complement parts has a hexahedral shape.

8 . The battery case of claim 1 , wherein each of the complement parts comprises polypropylene (PP).

9 . The battery case of claim 1 , wherein the first cup part and the second cup part are symmetrical with respect to each other about a symmetrical axis.

10 . The battery case of claim 9 , wherein the symmetrical axis is the same as a central axis extending between the longitudinal ends of the bridge.

11 . A pouch type secondary battery comprising:
an electrode assembly in which electrodes and separators are alternately stacked; and a battery case accommodating the electrode assembly therein, wherein the battery case comprises: a first cup part and a second cup part each facing each other and accommodating the electrode assembly therein; a folding part that integrally connects the first cup part to the second cup part and is folded so that the first cup part and the second cup part face each other; sealing parts formed around the first cup part and the second cup part, the sealing parts being sealed in contact with each other; and two complement parts disposed outside of the first cup part and the second cup part and adjacent to the folding part, the complement parts being sealed together with the sealing part, wherein each of the complement parts has a polyhedral shape of a constant solid volume, wherein each of the complement parts consists of a same material as a sealant layer that is an innermost layer of the pouch film, and wherein each of the complement parts protrudes upward and downward relative to a plane of the sealing parts of the pouch film that surround the complement parts.

12 . The pouch type secondary battery of claim 11 , wherein each of the complement parts has a hexahedral shape.

13 . The battery case of claim 1 , wherein the polyhedral shape of each of the complement parts is a constant shape.

14 . The pouch type secondary battery of claim 11 , wherein the polyhedral shape of each of the complement parts is a constant shape.

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/131

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

• H01M50/124

  having a layered structure · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title