Secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10763463-B2
Application number	US-201816155437-A
Country	US
Kind code	B2
Filing date	Oct 9, 2018
Priority date	Jun 29, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

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 electrode assembly;
an exterior material comprising a sealing portion, first and second forming portions for housing the electrode assembly, and an interval disposed between the first and second forming portions, the interval including a first boundary between the interval and the first forming portion and a second boundary between the interval and the second forming portion; and
electrode tabs connected to the electrode assembly through welding portions;
wherein the exterior material is folded using the first boundary and the second boundary such that the exterior material packages the electrode assembly by enclosing the electrode assembly to form three sealed sides and one non-sealed side,
wherein a thickness of the electrode assembly is larger than a sum of a depth of the first forming portion and a depth of the second forming portion, and
wherein at least one sealed side that does not face the non-sealed side is provided with the electrode tabs.

2. The secondary battery of claim 1 , wherein the interval does not include any folded area in an interior between the first boundary and the second boundary.

3. The secondary battery of claim 2 , wherein the welding portions are formed outside of the forming portions.

4. The secondary battery of claim 2 , wherein both sealed sides that do not face the non-sealed side are provided with the electrode tabs.

5. The secondary battery of claim 2 , wherein lateral intervals between the first and second forming portions and the sealing portion are a half (½) or more of a predetermined interval.

6. The secondary battery of claim 2 , wherein longitudinal intervals between the first and second forming portions and the sealing portion are a sum or more of the half (½) of a predetermined interval and a width of the welding portion.

7. The secondary battery of claim 2 , wherein the non-sealed side has a seamless sidewall.

8. The secondary battery of claim 2 , wherein a length of the interval is substantially the same as that of a predetermined interval.

9. The secondary battery of claim 8 , wherein the depths of the first forming portion and the second forming portion are equal.

10. The secondary battery of claim 2 , wherein the thickness of the electrode assembly is larger than the length of the first and second forming portions at the non-sealed side.

11. A secondary battery, comprising:
an electrode assembly;
an exterior material comprising a pair of forming portions for housing the electrode assembly, a sealing portion and an interval between the pair of forming portions; and
electrode tabs connected to the electrode assembly through welding portions;
wherein the exterior material packages the electrode assembly by enclosing the electrode assembly to form three sealed sides and one non-sealed side,
wherein the pair of forming portions face each other in a thickness direction such that the exterior material is folded around the electrode assembly using the non-sealed side,
wherein the interval includes a first boundary and a second boundary facing each other,
wherein the external material is folded using the first and second boundaries and the interval is devoid of any folded area in an interior between the first boundary and the second boundary,
wherein a thickness of the electrode assembly is larger than a sum of the depths of the pair of forming portions, and
wherein the welding portions are formed outside of the forming portions.

12. The secondary battery of claim 11 , wherein both sealed sides that do not face the non-sealed side are provided with the electrode tabs.

13. The secondary battery of claim 11 , wherein lateral intervals between the pair of forming portions and the sealing portion are a half (½) or more of a predetermined interval.

14. The secondary battery of claim 11 , wherein longitudinal intervals between the pair of forming portions and the sealing portion are a sum or more of the half (½) of a predetermined interval and a width of the welding portion.

15. The secondary battery of claim 11 , wherein the non-sealed side has a seamless sidewall.

16. The secondary battery of claim 11 , wherein the thickness of the electrode assembly is larger than the length of the pair of forming portions at the non-sealed side.

17. The secondary battery of claim 11 , wherein a length of the interval is substantially the same as that of a predetermined interval.

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

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/119

  Metals · CPC title

• H01M10/04 Primary

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title