Secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10121994-B2
Application number	US-201615196703-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Jun 29, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

Disclosed are a secondary battery and a method for manufacturing the same. According to an embodiment of the present invention, there is provided a secondary battery, including: an exterior material which includes a pouch film and a sealing portion formed at an outer side of the pouch film; and an electrode assembly which includes a plurality of electrode bodies laminated with a separator interposed therebetween and are packaged by the exterior material, wherein a pair of forming portions are formed within the pouch film to house the electrode assembly, and a predetermined interval is formed between the pair of forming portions.

First claim

What is claimed is:

1. A secondary battery, comprising:
an exterior material which includes a pouch film and a sealing portion formed at an outer side of the pouch film; and
an electrode assembly which includes a plurality of electrode bodies laminated with a separator interposed therebetween,
wherein a pair of forming portions are formed within the pouch film to house the electrode assembly, and
wherein the electrode assembly is packaged by the exterior material in a manner that three sides of the exterior material are sealed and one side is not sealed, and a thickness of the electrode assembly is larger than a sum of each depth of the pair of forming portions.

2. The secondary battery of claim 1 , wherein the pair of forming portions face each other with the electrode assembly interposed therebetween.

3. The secondary battery of claim 1 , wherein a predetermined interval is formed between the pair of forming portions, and
wherein a thickness of the electrode assembly has a relationship between the predetermined interval and a predetermined depth represented by Equation 1 below:
t≤T+ 2 f   [Equation 1]

wherein t denotes the thickness of the electrode assembly, T denotes the predetermined interval between the pair of forming portions, and f denotes the predetermined depths of each of the pair of forming portions.

4. The secondary battery of claim 3 , wherein the predetermined interval is greater than 0 and equal to or less than 20 mm.

5. The secondary battery of claim 1 , wherein lateral intervals between the pair of forming portions and the sealing portion are a half (½) or more of the predetermined interval.

6. The secondary battery of claim 1 , wherein both sides of the electrode assembly are respectively provided with electrode tabs connected through a welding portion, and
wherein longitudinal intervals between the pair of forming portions and the sealing portion are a sum or more of the half (½) of the predetermined interval and a width of the welding part.

7. The secondary battery of claim 1 , wherein the side of the exterior material that is not sealed is a folded side.

8. The secondary battery of claim 7 , wherein an inclination angle by the exterior material at an edge of the electrode assembly positioned at the sealed side is larger than an inclination angle by the exterior material at an edge of the electrode assembly positioned at the folded side.

9. The secondary battery of claim 7 , wherein an inclination angle by the exterior material at an edge of the electrode assembly positioned at the folded side is 90˜95 degrees.

10. The secondary battery of claim 7 , wherein the electrode assembly and the exterior material at the folded side are in contact with each other.

11. The secondary battery of claim 1 ,
wherein the pouch film is formed of a single body and is in a folded shape,
wherein a first area, a second area, a third area, a fourth area, and a fifth area are sequentially arranged between a first edge and a second edge of the pouch film in a first direction,
wherein the first area and the fifth area, in combination, form a first sidewall of the exterior material,
wherein the second area forms a bottom layer of the exterior material,
wherein the third area forms a second sidewall of the exterior material,
wherein the fourth area forms an upper layer of the exterior material,
wherein the sealing portion is provided over the first edge, the second edge, or both,
wherein the first edge and the second edge meet each other on the first sidewall and are bonded to each other by the sealing portion,
wherein a first forming portion is formed in the second area of the pouch film and protrudes downward by a first thickness f1,
wherein a second forming portion is formed in the fourth area of the pouch film and protrudes upward by a second thickness f2,
wherein the electrode assembly is located between the first and the second forming portions and has a third thickness t, and
wherein the third thickness t of the electrode assembly is larger than a sum of the first thickness f1 and the second thickness f2.

12. The secondary battery of claim 11 ,
wherein the first and the second forming portions face each other.

13. The secondary battery of claim 11 ,
wherein the third area of the pouch film has a first width T when measured along the first direction,
wherein the first thickness f1 is the same as the second thickness f2, and
wherein the third thickness t of the electrode assembly satisfies the following Equation
t≤T+ 2 f

wherein f=f1=f2.

14. The secondary battery of claim 13 ,
wherein a width of the first area is between T/2 and T, inclusive, when measured along the first direction, and
wherein a width of the fifth area is between T/2 and T, inclusive, when measured along the first direction.

15. The secondary battery of claim 13 , further comprising:
an electrode tab provided between the electrode assembly and an outside of the pouch film; and
a welding portion coupling the electrode assembly to the electrode tab,
wherein the pouch film extends from a third edge through a sixth area, the second area, and a seventh area to a fourth edge in a second direction,
wherein the second direction is different from the first direction,
wherein the welding portion has a width W when measured along the second direction, and
wherein a width of the sixth area of the pouch film is the same as or larger than (W+T/2).

16. The secondary battery of claim 11 ,
wherein the first sidewall of the exterior material is formed with a seam, the seam being created by bonding the first edge and the second edge using the sealing portion, and
wherein the second sidewall of the exterior material is formed seamless and without using the sealing portion.

17. The secondary battery of claim 16 ,
wherein the first sidewall has a first inclination with respect to the bottom layer,
wherein the second sidewall has a second inclination with respect to the bottom layer, and
wherein the second inclination is larger than the first inclination.

18. The secondary battery of claim 16 , wherein the electrode assembly directly contacts the second sidewall of the exterior material.

19. A secondary battery, comprising:
an exterior material which includes a pouch film and a sealing portion formed at an outer side of the pouch film; and
an electrode assembly which includes a plurality of electrode bodies laminated with a separator interposed therebetween and are packaged by the exterior material,
wherein a pair of forming portions are formed within the pouch film to house the electrode assembly,
wherein the exterior material packages the electrode assembly in a manner that three sides of the exterior material are sealed, and one side is not sealed, and
wherein a space between the electrode assembly and the side of the exterior material that is not sealed is smaller than a space between the electrode assembly and at least one of the sides of the exterior material that are sealed.

20. The secondary battery of claim 19 ,
wherein the side that is not sealed is a side that the exterior material is folded around the electrode assembly,
wherein a side that faces the side that is not sealed is a side that exterior material is sealed, and
wherein the space between the side that is not sealed and the electrode assembly is smaller than a space between the side that faces the side that is not sealed and the electrode assembly.

21. The secondary battery of claim 19 , whe

Assignees

• Sk Innovation Co Ltd

Inventors

• Kang Hee-Gyoung

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/119

  Metals · CPC title

• H01M2/263

  Electricity · mapped topic