Outer case for flexible rechargeable battery and flexible rechargeable battery including same

Patent metadata

Field	Value
Publication number	US-11465384-B2
Application number	US-201816624851-A
Country	US
Kind code	B2
Filing date	May 8, 2018
Priority date	Jul 4, 2017
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present disclosure relates to an outer case for a flexible rechargeable battery, including a first resin layer configured to include a first patterned area, a moisture barrier layer disposed on the first resin layer to include a second patterned area, a second resin layer disposed on the moisture barrier layer to include a third patterned area, and a stress relaxation layer configured to cover the third patterned area.

First claim

The invention claimed is:

1. An outer case for a flexible rechargeable battery, comprising:
a first resin layer configured to include a first patterned area and a first flat area outside the first patterned area;
a moisture barrier layer disposed on the first resin layer to include a second patterned area and a second flat area outside the second patterned area;
a second resin layer disposed on the moisture barrier layer to include a third patterned area and a third flat area outside the third patterned area; and
a stress relaxation layer configured to cover the third patterned area,
wherein the first flat area, the second flat area, and the third flat area overlap each other.

2. The outer case of claim 1 , wherein
each of the first patterned area, the second patterned area, and the third patterned area includes a plurality of patterns disposed along a direction.

3. The outer case of claim 2 , wherein
the plurality of patterns include a concave portion and a convex portion.

4. The outer case of claim 2 , wherein
vertical cross-sections of the patterns have one or more of a triangular shape, a rectangular shape, a polygonal shape, a semicircular shape, a semi-elliptical shape, a wave shape, and a mixture thereof.

5. The outer case of claim 1 , wherein
the stress relaxation layer is made of a silicone-based resin or a urethane-based resin.

6. The outer case of claim 1 , wherein
the average thickness of the stress relaxation layer is in a range of 1 μm to 30 μm.

7. The outer case of claim 1 , wherein
the first patterned area, the second patterned area, and the third patterned area are positioned to correspond to each other.

8. The outer case of claim 1 , wherein
the first resin layer includes a plurality of first patterned areas,
the moisture barrier layer includes a plurality of second patterned areas, and
the second resin layer includes a plurality of third patterned areas.

9. The outer case of claim 1 , wherein
the stress relaxation layer has a same vertical cross-sectional shape as that of the patterns formed in the third patterned area.

10. The outer case of claim 1 , wherein
a first surface of the stress relaxation layer faces a second surface thereof,
the second surface of the stress relaxation layer includes a fourth patterned area contacting the third patterned area, and
the first surface of the stress relaxation layer is a flat surface.

11. The outer case of claim 1 , wherein
the outer case is flexible.

12. The outer case of claim 11 , wherein
the outer case includes a bending area and a non-bending area, and
the first patterned area, the second patterned area, and the third patterned area are positioned to correspond to the bending area.

13. A flexible rechargeable battery comprising:
an electrode assembly in which a stack including a positive electrode, a negative electrode, and a separator interposed therebetween is spiral-wound in a direction;
a first outer case configured to accommodate the electrode assembly therein; and
a second outer case disposed to face the first outer case and to accommodate the electrode assembly; and
the first outer case is the outer case for a flexible rechargeable battery according to claim 1 .

14. The flexible rechargeable battery of claim 13 , wherein
the first resin layer of the first outer case contacts a first surface of the electrode assembly.

15. The flexible rechargeable battery of claim 14 , wherein
the second outer case is the outer case for a flexible rechargeable battery according to claim 1 .

16. The flexible rechargeable battery of claim 15 , wherein
the first resin layer of the second outer case contacts a second surface of the electrode assembly that faces the first surface thereof.

17. An outer case for a flexible rechargeable battery, comprising:
a first resin layer configured to include a patterned area and a flat area;
a moisture barrier layer disposed on the first resin layer to include a patterned area and a flat area; and
a stress relaxation layer configured to cover the patterned area of the moisture barrier layer,
wherein the flat area of the first resin layer and the flat area of the moisture barrier layer overlap each other.

18. The outer case of claim 17 , wherein
each of a patterned area of the first resin layer and a patterned area of the moisture barrier layer includes a plurality of patterns disposed along a direction.

19. The outer case of claim 18 , wherein
the plurality of patterns include a concave portion and a convex portion.

20. The outer case of claim 18 , wherein
vertical cross-sections of the patterns have one or more of a triangular shape, a rectangular shape, a polygonal shape, a semicircular shape, a semi-elliptical shape, a wave shape, and a mixture thereof.

21. The outer case of claim 17 , wherein
the stress relaxation layer is made of a silicone-based resin or a urethane-based resin.

22. The outer case of claim 17 , wherein
the patterned area of the first resin layer and the patterned area of the moisture barrier layer are positioned to correspond to each other.

23. The outer case of claim 17 , wherein
the first resin layer includes a plurality of patterned areas, and
the moisture barrier layer includes a plurality of patterned areas.

24. The outer case of claim 17 , wherein
the stress relaxation layer has a same vertical cross-sectional shape as the patterns formed in the patterned area of the first resin layer or the patterned area of the moisture barrier layer.

25. The outer case of claim 1 , wherein
a first surface of the stress relaxation layer that faces a second surface thereof,
the second surface of the stress relaxation layer includes a patterned area facing the moisture barrier layer,
the first surface of the stress relaxation layer is a flat surface.

26. A flexible rechargeable battery comprising:
an electrode assembly in which a stack including a positive electrode, a negative electrode, and a separator interposed therebetween is spiral-wound in a direction;
a first outer case configured to accommodate the electrode assembly therein; and
a second outer case disposed to face the first outer case and to accommodate the electrode assembly,
wherein the first outer case is the outer case for a flexible rechargeable battery according to claim 17 .

27. The flexible rechargeable battery of claim 26 , wherein
the second outer case is the outer case for a flexible rechargeable battery according to claim 17 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Bang Wonkyu
• Suh Junwon
• Sohn Juhee
• Yang Jungyup
• Eom Hyeri
• Yi Jeongdoo
• Han Da-Un
• Han Juhyeong
• Hong Seokhun

Classifications

• H01M50/105

  Pouches or flexible bags · CPC title

• B32B15/085

  comprising polyolefins · CPC title

• B32B3/28

  characterised by a layer comprising a deformed thin sheet {, i.e. the layer having its entire thickness deformed out of the plane}, e.g. corrugated, crumpled (B32B29/08 takes precedence) · CPC title

• B32B2250/03

  3 layers · CPC title

• B32B27/36

  comprising polyesters · CPC title