Battery case sealing device and secondary battery manufactured using the same

Abstract

To solve the above problems, a battery case sealing device according to an embodiment of the present invention includes a sealing tool that seals the side of a pouch-type secondary battery, the sealing tool including a main body and a sealing part formed on one side of the main body and that directly pressurizes the side to seal it, the sealing part including a weak sealing part that seals the inner part of the side and is recessed inward, and a pattern part that seals the outer part of the side and has ribs that protrude outward and grooves that are recessed inward that are formed alternately and at regular intervals.

Claims

1. A sealing tool for sealing the sides of a pouch-type secondary battery; and The sealing tool comprises: The main body, a sealing part formed on one side of the body and directly pressing the side to seal it; Including, The sealing portion is A weak sealing portion configured to seal the inner portion of the side, the weak sealing portion being recessed inward; a pattern part configured to seal an outer part of the side, the pattern part including a rib protruding outward and a groove recessed inward, the pattern part being formed in a regular and repeated manner; Including, The sealing tool comprises: a first sealing tool for applying pressure to one surface of the side; a second sealing tool that is in contact with the first sealing tool and the side and presses the other surface of the side; Further comprising: The rib of the first sealing tool and the groove of the second sealing tool abut against each other with the side therebetween, A battery case sealing device, wherein the rib of the second sealing tool and the groove of the first sealing tool abut against each other with the side sandwiched therebetween.

2. The groove is The battery case sealing device according to claim 1 , further comprising a longitudinal groove formed along a longitudinal direction of the pattern portion.

3. The groove is The battery case sealing device according to claim 1 or 2, further comprising a width groove formed along a width direction of the pattern portion.

4. The groove of the pattern portion is The battery case sealing device according to claim 1 , wherein the sealing portion is recessed deeper than the weak sealing portion.

5. The weak sealing portion is The battery case sealing device according to claim 4, wherein the sealing member is recessed inwardly by a thickness of 10 μm to 20 μm.

6. The pattern portion is 5. The battery case sealing device according to claim 4, wherein the groove is recessed inwardly by a thickness of 40 μm to 60 μm.

7. The rib and the groove are 7. The battery case sealing device according to claim 1, wherein the sealing members have the same width.

8. The weak sealing portion is The battery case sealing device according to any one of claims 1 to 7, wherein the corner (R1) is rounded.

9. The weak sealing portion is The battery case sealing device according to claim 8, wherein the corner (R1) is rounded with a curvature radius of 0.7 mm to 0.8 mm.

10. The pattern portion is The battery case sealing device according to any one of claims 1 to 9, wherein the corner (R2) is rounded.

11. The pattern portion is The battery case sealing device according to claim 10, wherein the corner (R2) is rounded with a curvature radius of 0.2 mm to 0.3 mm.

12. The first sealing part of the first sealing tool, A first weak sealing portion configured to seal an inner portion of the side, the first weak sealing portion being recessed inward; a first pattern part configured to seal an outer portion of the side, the first pattern part including a first rib protruding outward and a first groove recessed inward, the first pattern part being formed in a regular, repeated pattern; Including, The second sealing portion of the second sealing tool includes: A second weak sealing portion configured to seal an inner portion of the side, the second weak sealing portion being recessed inward; a second pattern part configured to seal an outer portion of the side, the second pattern part including a second rib protruding outward and a second groove recessed inward, the second pattern part being formed in a repeating pattern; 12. The battery case sealing device of claim 1 , comprising:

13. The first pattern portion and the second pattern portion are The first rib and the second groove are in contact with each other with the side interposed therebetween, The battery case sealing device according to claim 12 , wherein the second rib and the first groove abut against each other with the side interposed therebetween.

14. The sealing portion is The battery case sealing device according to claim 1 , wherein a groove into which an electrode lead of the secondary battery is inserted is recessed inwardly.

15. A secondary battery manufactured by using the battery case sealing device according to any one of claims 1 to 14, an electrode assembly formed by alternately stacking electrodes and separators; a battery case in which the electrode assembly is received and sealed; Including, The battery case is a first case having a cup portion formed therein for receiving the electrode assembly; a second case that covers the first case from above; a side extending from the cup portion and having a region where the first case and the second case are sealed to each other; Including, The side is A secondary battery in which projections or depressions are formed on the outer surface of the area to be sealed.

16. The side is The inner surface of the area to be sealed is formed with projections or depressions; and The secondary battery of claim 15, wherein the projections or depressions are formed in a shape opposite to the projections or depressions of the outer surface.

17. The unevenness is The secondary battery according to claim 15 or 16, wherein the side is formed to have a length along a longitudinal direction of the side.

18. The unevenness is It is formed with multiple protruding or recessed shapes, The secondary battery of claim 15 , wherein the intervals between the protruding or recessed shapes are uniform.

19. The unevenness is The secondary battery according to claim 15 , wherein the cross section of the protruding or recessed shape is formed in at least one of a rectangle and a rhombus.

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