Pouch casing material for secondary battery

Patent metadata

Field	Value
Publication number	US-11515562-B2
Application number	US-202117559528-A
Country	US
Kind code	B2
Filing date	Dec 22, 2021
Priority date	Nov 3, 2015
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

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.

First claim

What is claimed is:

1. A pouch casing material which comprises a first cup and a second cup formed in a monolithic pouch film and 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;
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; and
the sum of the height (Ha 1 ) of the first lateral side portion of the first cup and the height (Ha 2 ) of the first lateral side portion of the second cup is less than the sum of the height (Hb 1 ) of the second lateral side portion of the first cup and the height (Hb 2 ) of the second lateral side portion of the second cup, such that the sum of the height (Ha 1 ) of the first lateral side portion of the first cup, the height (Ha 2 ) of the first lateral side portion of the second cup and the width (W) equals the sum of the height (Hb 1 ) of the second lateral side portion of the first cup and the height (Hb 2 ) of the second lateral side portion of the second cup;
wherein, when the first cup and the second cup are stacked with the insides of the respective first and second cups facing each other and the sealing portions are sealed with the electrode assembly enclosed therein, the cup connection and the first lateral side portions of the first and second cups extending therefrom collectively define a planar side wall.

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 a gap between 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 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.

4. The pouch casing material according to claim 3 , wherein each of the third lateral side portions has a first edge connected to the first lateral side portion and a second edge connected to the second lateral side portion, the length of the first edge being shorter than the length of the second edge.

5. The pouch casing material according to claim 3 , 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.

6. The pouch casing material according to claim 5 , 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.

7. The pouch casing material according to claim 5 , 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.

8. The pouch casing material according to claim 5 , 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.

9. The pouch casing material according to claim 5 , 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.

10. The pouch casing material according to claim 9 , 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.

11. The pouch casing material according to claim 1 , wherein the planar side wall defines a flat outer surface lacking a portion thereof that protrudes outwardly away from the electrode assembly receiving portion.

Assignees

• Lg Energy Solution Ltd

Inventors

• Choi Mi-Geum
• Choi Hang-June
• Mun Jeong-O

Classifications

• H01M50/126 Primary

  comprising three or more layers · CPC title

• H01M50/136

  Flexibility or foldability · CPC title

• H01M10/045 Primary

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

• H01M50/178

  for pouch or flexible bag cells · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title