Pouch type secondary battery and method for manufacturing the same
The present invention provide a pouch type secondary battery and a method for manufacturing the same. More particularly, the present invention provides a pouch type secondary battery and a method for manufacturing the same, in which a pouch case is formed in a folding manner without being subjected to a forming process (press process), such that there is no limit in a length, and a thickness of an inner space of the pouch case is not limited.
1. A pouch type secondary battery comprising:
a pouch case in which an electrode assembly is housed,
wherein the pouch case comprises:
a plurality of space-forming sections which are formed in a plane and connected to each other in parallel, and are folded to form a space for housing the electrode assembly; and
tab drawing sections which extend from the plurality of space-forming sections such that electrode tabs of the electrode assembly are drawn out,
wherein the tab drawing section comprises:
a pair of first sealing parts which are formed at respective ends of a pair of opposite space-forming sections among the plurality of space-forming sections, and form tab drawing parts for drawing out the electrode tabs; and
a pair of second sealing parts which are formed at respective ends of a pair of opposite space-forming sections in which the pair of first sealing parts are not formed, and come into contact with the first sealing part in the space to fix the first sealing part,
wherein the pair of second sealing parts have a trapezoidal shape, and a length of the second sealing part is less than that of the first sealing part.
2. The pouch type secondary battery according to claim 1 , wherein the space is formed by the space-forming sections being folded along a plurality of imaginary lines formed in parallel to the pouch case.
3. The pouch type secondary battery according to claim 1 , wherein the tab drawing sections extend from the plurality of space-forming sections in a direction perpendicular to a direction in which the plurality of space-forming sections are arranged.
4. The pouch type secondary battery according to claim 1 , wherein the pair of first sealing parts respectively comprise a first sealing section adapted to seal the space, and a tab support part which extends from one end of the first sealing section to support the electrode tab.
5. The pouch type secondary battery according to claim 1 , wherein the space has a rectangular parallelepiped shape.
6. The pouch type secondary battery according to claim 1 , wherein the pair of second sealing parts comprise:
a second sealing section which is adapted to seal a contact region between the pair of first sealing parts, and the space-forming sections in which the pair of second sealing parts are disposed; and
a folding section which extends from the second sealing section and is folded from the second sealing section to prevent an interference with the tab drawing part.
7. The pouch type secondary battery according to claim 1 , wherein the space formed by the pouch case has a thickness of 20 mm or more.