Battery cell having outer edge sealed portion with sealed lines and battery cell sealing apparatus for manufacture thereof
Disclosed herein is a battery cell configured to have a structure in which an electrode assembly is mounted in a battery case made of a laminate sheet including a resin layer and a metal layer, and the battery case is provided with a sealed portion (an outer edge sealed portion), which is formed at the outer edge of a receiving part, in which the electrode assembly is mounted, by thermal welding in order to seal the battery case, wherein electrode terminals are located at an upper sealed portion, a lower sealed portion, or the upper sealed portion and the lower sealed portion, two or more sealed lines are formed in at least one of side sealed portions, which are adjacent to the upper sealed portion or the lower sealed portion, such that the sealed lines are spaced apart from each other and parallel to each other, the sealed lines are continuously formed from the outer edge end of the upper sealed portion to the outer edge end of the lower sealed portion in the longitudinal direction of the battery case, and the outer edge sealed portion, in which the sealed lines are formed, is bent between the sealed lines at an angle of 30 to 180 degrees.
1. A battery cell, comprising:
a battery case made of a laminate sheet comprising a resin layer and a metal layer, the battery case having a receiving part; and
an electrode assembly mounted in the battery case,
wherein the battery case is provided with a sealed portion formed at an outer edge of the receiving part to seal the battery case,
wherein electrode terminals are located at an upper sealed portion of the battery case, or a lower sealed portion of the battery case, or the upper sealed portion and the lower sealed portion of the battery case,
wherein two or more sealed lines joining two layers of the battery case to each other are formed in at least one side sealed portion, which is adjacent to the upper sealed portion or the lower sealed portion, such that the sealed lines are spaced apart from each other and parallel to each other,
wherein one or more non-welded portions are located between the sealed lines or wherein one or more low welded portions, having a lower thermally welded extent than the sealed lines, are located between the sealed lines,
wherein each sealed line is continuously formed from an outer edge end of the upper sealed portion to an outer edge end of the lower sealed portion in a longitudinal direction of the battery case, and
wherein the at least one side sealed portion, in which the sealed lines are formed, is bent between the sealed lines at an angle of 30 to 180 degrees.
2. The battery cell according to claim 1 , wherein the battery cell is configured to have a rectangular plate-shaped structure.
3. The battery cell according to claim 1 , wherein the battery case comprises a first case having the receiving part, in which the electrode assembly is mounted, formed therein and a second case for covering the receiving part, an outer edge of the second case being thermally welded to an outer edge of the first case in order to seal the battery case.
4. The battery cell according to claim 3 , wherein the first case and the second case are configured as separate members or as a single member, in which one end of the first case is coupled to a corresponding end of the second case.
5. The battery cell according to claim 1 , wherein each of the sealed lines is formed in a shape of a straight line that is parallel to an outer edge of the receiving part adjacent thereto when viewed in a plan view.
6. The battery cell according to claim 1 , wherein the sealed lines have the same width.
7. The battery cell according to claim 1 , wherein a width of an inside sealed line is greater than a width of an outside sealed line.
8. The battery cell according to claim 1 , wherein a width of an outside sealed line is greater than a width of an inside sealed line.
9. The battery cell according to claim 1 , wherein a width of each of the sealed lines is 10% to 45% of a width of the outer edge sealed portion in which the sealed lines are formed.
10. The battery cell according to claim 1 , wherein a distance between the sealed lines is 10% to 100% of an average width of the sealed lines.
11. The battery cell according to claim 1 , wherein the low welded portions have a thermally welded extent that is 5% to 90% of the thermally welded extent of the sealed lines.
12. The battery cell according to claim 1 , wherein a thermal welding temperature applied to the sealed lines is higher than a thermal welding temperature applied to the low welded portions.
13. The battery cell according to claim 1 , wherein the sealed lines comprise a first sealed line, a second sealed line, and a third sealed line, which are sequentially arranged in a sequence in which the sealed lines are adjacent to the receiving part, and wherein a first bent portion is provided between the first sealed line and the second sealed line, and a second bent portion is provided between the second sealed line and the third sealed line.
14. The battery cell according to claim 13 , wherein the second bent portion is bent such that the third sealed line faces the second sealed line.
15. The battery cell according to claim 14 , wherein, in a state in which the second bent portion is bent, the first bent portion is bent such that one surface of the third sealed line, opposite the other surface of the third sealed line facing the second sealed line, faces the receiving part.
16. A device comprising a battery cell according to claim 1 .
17. The device according to claim 16 , wherein the device is a mobile device, a tablet computer, a laptop computer, a power tool, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage apparatus.