Electrochemical device and method for manufacturing same

1. An electrochemical device, comprising:

a first outer case defining an accommodating chamber therein;

an electrode assembly accommodated in the accommodating chamber; and

a second outer case comprising a heat shrinkable wrapping layer, and the first outer case having a two-layered structure including an inner fusion layer adjacent to the electrode assembly and an outer metal layer stacked on the fusion layer and being wrapped in the heat shrinkable wrapping layer.

2. The electrochemical device according to claim 1 , wherein the first outer case comprises:

a first body portion; and

a second body portion arranged opposite to the first body portion,

wherein the first body portion and the second body portion cooperatively define the accommodating chamber.

3. The electrochemical device according to claim 2 , wherein the first body portion and the second body portion have a same size.

4. The electrochemical device according to claim 2 , wherein at least one of the first body portion and the second body portion defines a groove, the second body portion is connected to the first body portion to shield the groove so as to define the accommodating chamber, and the electrode assembly is embedded in the groove.

5. The electrochemical device according to claim 4 , wherein an edge of an opening of the groove is at a predetermined distance from an edge of the first outer case.

6. The electrochemical device according to claim 4 , wherein the fusion layer of the first body portion is fused with the fusion layer of the second body portion.

7. The electrochemical device according to claim 1 , wherein the first outer case is an integrally molded piece.

8. The electrochemical device according to claim 2 , wherein the first body portion is integral with the second body portion.

9. The electrochemical device according to claim 1 , wherein the fusion layer has a thickness of 20 to 90 μm.

10. The electrochemical device according to claim 1 , wherein the metal layer has a thickness of 20 to 90 μm.

11. The electrochemical device according to claim 1 , wherein the second outer case has a thickness of 10 to 110 μm.

12. The electrochemical device according to claim 1 , wherein the second outer case comprises at least one selected from a group consisting of a resin layer and a rubber layer.

13. The electrochemical device according to claim 1 , wherein the second outer case is a heat shrinkable tube.

14. The electrochemical device according to claim 1 , wherein the electrochemical device is a pouch battery.

15. A method for manufacturing the electrochemical device of claim 1 , the method comprising:

selecting the first outer case, and sealing the first outer case to accommodate an electrode assembly; and

arranging the first outer case accommodating the electrode assembly therein in the second outer case for heat treatment, such that the second outer case is shrunk and attached to a surface of the first outer case.

16. The method according to claim 15 ; wherein before the first outer case is sealed, one portion of the first outer case is molded and formed with a groove, the electrode assembly is placed in the groove, and the other portion, without being provided with the groove, of the first outer case is folded to shield the groove.

17. The method according to claim 16 , wherein the one portion of the first outer case and the other portion of the first outer case each comprise a fusion layer, and the first outer case is sealed in such a way that the one portion of the first outer case is connected to the other portion of the first outer case by fusing the respective fusion layers together.

18. The method according to claim 17 , wherein fused parts of the respective fusion layers are cut and folded towards a side wall of the electrode assembly.

19. The method according to claim 16 , wherein the first outer case is sealed in such a further way that two open sides of the first outer case, which are not used for electrolyte injection, are sealed by a heat sealing device.