Pouch casing material for secondary battery

• US 10,454,130 B2
• Filed: 11/03/2016
• Issued: 10/22/2019
• Est. Priority Date: 11/03/2015
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Choi, Mi-Geum, Choi, Hang-June, Mun, Jeong-O
• Primary Examiner(s): Akram, Imran
• Application Number:
  US15/747,654
• Publication Number:
  US 20180219245A1
• Time in Patent Office: 1,083 Days
• CPC Class Codes: H01M 10/045 Cells or batteries with folded plate-like electrodes
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: H01M 50/126 comprising three or more layers
• CPC Class Codes: H01M 50/136 Flexibility or foldability
• CPC Class Codes: H01M 50/178 for pouch or flexible bag cells
• 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

The present disclosure relates to a pouch casing material including two cups forming an electrode assembly receiving portion and formed integrally in one pouch film. The pouch casing material includes an upper pouch member and a lower pouch member formed integrally with each other, and the connection between the upper pouch member and the lower pouch member does not protrude toward the outside. Thus, the total length of a battery is reduced.

Claims

1. A pouch casing material which comprises:

a first cup and a second cup stacked in such a manner that the insides of the cups face each other to form an electrode assembly receiving portion capable of enclosing an electrode assembly, the first cup and the second cup are spaced apart from each other with a cup connection having a predetermined width W interposed therebetween, and sealing portions extended from the cups and cup connection are formed integrally on the outer circumferential surface of the pouch casing material,

wherein each of the cups comprises a first lateral side portion extended from the cup connection and a second lateral side portion facing the first lateral side portion,

wherein the first lateral side portion and the second lateral side portion of each of the cups are connected with each other through two third lateral side portions facing each other,

wherein the sum of the height Ha1 of the first lateral side portion of the first cup, the height Ha2 of the first lateral side portion of the second cup and the width W equals to the sum of the height Hb1 of the second lateral side portion of the first cup and the height Hb2 of the second lateral side portion of the second cup,

wherein a step compensating portion configured to compensate for a difference in height of the first lateral side portion from the second lateral side portion is provided between the third lateral side portion and the sealing portion, and the step compensating portion is formed as a triangle sharing one side with the third lateral side portion.

2. The pouch casing material according to claim 1, wherein the electrode terminals of the electrode assembly enclosed in the pouch casing material are drawn out from the gap of the sealing portions extended from the second lateral side portions of the first cup and the second cup.

3. The pouch casing material according to claim 1, wherein the length of the side connected to the first lateral side portion is shorter than the length of the side connected to the second lateral side, in the third lateral side portion.

4. The pouch casing material according to claim 1, wherein the length of one side of the step compensating portion extended from one side of the first lateral side portion equals to or larger than the difference in height of the first lateral side portion from that of the second lateral side portion.

5. The pouch casing material according to claim 1, wherein the third lateral side portion and the step compensating portion form one inner side portion of the electrode assembly receiving portion of the pouch casing material.

6. The pouch casing material according to claim 1, wherein the step compensating portion protrudes out from the plane of the third lateral side portion toward the outside, when assembling the pouch casing material.

7. The pouch casing material according to claim 1, wherein the first step compensating portion of the first cup, the step compensating portion of the second cup, the sealing portion and the cup connection individually share one side with a rectangular folding portion and are connected one another through the folding portion.

8. The pouch casing material according to claim 7, wherein the folding portion is folded toward the inside of the pouch casing material when the electrode assembly is enclosed, and thus does not protrude toward the outside.