CAN FOR CYLINDRICAL LITHIUM RECHARGEABLE BATTERY AND CYLINDRICAL LITHIUM RECHARGEABLE BATTERY USING THE SAME

Abstract

A can for a cylindrical lithium rechargeable battery, and a cylindrical lithium rechargeable battery using the same. The battery includes: an electrode assembly having cathode and anode plates facing to each other, a separator interposed between the cathode and anode plates, and cathode and anode taps formed on the cathode and anode plates, respectively; a can accommodating the electrode assembly; and a cap assembly to seal an opening of an upper end portion of the can. The can has surface plate and a lower plate, and a protrusion is formed on the lower plate so as to increase the contact resistance between the anode tap and the lower plate, when the anode tap is welded to the lower plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a vertical-sectional diagram illustrating a general cylindrical lithium rechargeable battery;

FIG. 2 a is a perspective diagram illustrating a can for a cylindrical lithium rechargeable battery according to one embodiment of the present invention;

FIG. 2 b is a cross-sectional diagram of the can taken along A-A in FIG. 2a;

FIG. 3 a is a perspective diagram illustrating a can for a cylindrical lithium rechargeable battery according to another embodiment of the present invention;

FIG. 3 b is a cross-sectional diagram of the can taken along B-B in FIG. 3a;

FIG. 4 a is a perspective diagram illustrating a can for a cylindrical lithium rechargeable battery according to another embodiment of the present invention;

FIG. 4 b is a cross-sectional diagram of the can taken along C-C in FIG. 4a;

FIG. 5 a is a perspective diagram illustrating a can for a cylindrical lithium rechargeable battery according to another embodiment of the present invention;

FIG. 5 b is a cross-sectional diagram of the can taken along D-D in FIG. 5a;

FIG. 6 is a perspective diagram illustrating a can for a cylindrical lithium rechargeable battery according to still another embodiment of the present invention; and

FIG. 7 is a cross-sectional diagram illustrating a welding process when the can for a cylindrical lithium rechargeable battery of FIG. 3a is applied.

Claims

1. A can for a cylindrical lithium rechargeable battery, the battery comprising an electrode assembly having cathode and anode plates facing to each other, a separator interposed between the cathode and anode plates, cathode and anode taps formed on the cathode and anode plates, respectively, and a cap assembly to seal an opening of an upper end portion of the can, the can comprising: a surface plate having a bottom; anda lower plate disposed upon the bottom of the lower plate; wherein the lower plate comprises a group of 3 or more protrusions to increase the contact resistance between the lower plate and the anode tap when the anode tap is welded to the lower plate.

2. The can of claim 1, wherein the group of protrusions is formed by embossing a second surface of the lower plate.

3. The can of claim 1, wherein the group of protrusions consists of from 3 to 6 protrusions.

4. The can of claim 2, wherein the group of protrusions comprises a vertical cross-sectional shape, wherein the vertical cross-sectional shape comprises one of a circular, an ovoid, and a polygonal shape.

5. The can of claim 2, wherein the group of protrusions comprises a horizontal cross-sectional shape, wherein the horizontal cross-sectional shape comprises one of a circular, an ovoid, and a polygonal shape.

6. The can of claim 2, wherein the group of protrusions comprises one of a linear shape and a matrix shape.

7. The can of claim 6, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

8. The can of claim 6, wherein the group of protrusions has a width of 1.0 mm or less.

9. The can of claim 6, wherein the group of protrusions has a height of from 0.05 to 0.2 mm.

10. The can of claim 6, wherein a distance between adjacent protrusions is at least 1.0 mm.

11. The can of claim 1, wherein the protrusions are conductive points disposed upon a first surface of the lower plate.

12. The can of claim 11, wherein the conductive points comprise one of a metal and a metal alloy, having a higher electric resistance than aluminum metal.

13. The can of claim 12, wherein the conductive points comprise one of cobalt (Co), iron (Fe), platinum (Pt), and brass.

14. The can of claim 11, wherein the group of protrusions has a width of 1.0 mm or less.

15. The can of claim 11, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

16. The can of claim 1, wherein the protrusions are bar-shaped and are embossed into a second surface of the lower plate.

17. The can of claim 16, wherein the bar-shaped protrusions are disposed parallel to each other.

18. The can of claim 17, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

19. The can of claim 17, wherein each bar-shaped protrusion is disposed within 1.0 mm of an adjacent bar-shaped protrusion.

20. The can of claim 17, wherein each bar-shaped protrusion is disposed at least 1.0 mm from an adjacent bar-shaped protrusion.

21. The can of claim 16, wherein the group protrusions comprises a matrix shape.

22. The can of claim 21, wherein the group of protrusions has a length of at least 20% of the diameter of the lower plate.

23. The can of claim 1, wherein the group of protrusions is disposed in approximately the middle of the lower plate.

24. A cylindrical lithium rechargeable battery, comprising: a can comprising, a cylindrical surface plate having an upper end and a lower end, anda lower plate disposed on the lower end;an electrode assembly disposed in the can, comprising, a cathode plate,an anode plate facing the cathode plate, anda separator interposed between the cathode plate and the anode plate;a cap assembly disposed upon the upper end of the can;a cathode tap connecting the cathode plate to the cap; andan anode tap connecting the anode and the lower plate, wherein the lower plate comprises a group of 3 or more protrusions to increase the contact resistance between the anode tap and the lower plate when the anode tap is welded to the lower plate.

25. The cylindrical lithium rechargeable battery of claim 24, wherein the group of protrusions is formed by embossing a second surface of the lower plate.

26. The cylindrical lithium rechargeable battery of claim 25, wherein the group of protrusions comprises a vertical cross-sectional shape, wherein the vertical cross-sectional shape comprises one of a circular, an ovoid, and a polygonal shape.

27. The cylindrical lithium rechargeable battery of claim 25, wherein the group of protrusions comprises a horizontal cross-sectional shape, wherein the horizontal cross-sectional shape comprises one of a circular, an ovoid, and a polygonal shape.

28. The cylindrical lithium rechargeable battery of claim 25, wherein the group of protrusions comprises one of a linear shape and a matrix shape.

29. The cylindrical lithium rechargeable battery of claim 28, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

30. The cylindrical lithium rechargeable battery of claim 28, wherein the group of protrusions has a width of 110 mm or less.

31. The cylindrical lithium rechargeable battery of claim 28, wherein the group of protrusions has a height of from 0.05 to 0.2 mm.

32. The cylindrical lithium rechargeable battery of claim 28, wherein a distance between adjacent protrusions is at least 1.0 mm.

33. The cylindrical lithium rechargeable battery of claim 24, wherein the protrusions are conductive points disposed upon a first surface of the lower plate.

34. The cylindrical lithium rechargeable battery of claim 33, wherein the conductive points comprise one of a metal and a metal alloy, having a higher electric resistance than aluminum metal.

35. The cylindrical lithium rechargeable battery of claim 34, wherein the conductive points comprise one of cobalt (Co), iron (Fe), platinum (Pt), and brass.

36. The cylindrical lithium rechargeable battery of claim 33, wherein the group of protrusions has a width of 1.0 mm or less.

37. The cylindrical lithium rechargeable battery of claim 33, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

38. The cylindrical lithium rechargeable battery of claim 24, wherein the protrusions are bar-shaped and are embossed into a second surface of the lower plate.

39. The cylindrical lithium rechargeable battery of claim 38, wherein the bar-shaped protrusions are disposed parallel to each other.

40. The cylindrical lithium rechargeable battery of claim 39, wherein the group of protrusions has a length of at least 30% of the diameter of the lower plate.

41. The cylindrical lithium rechargeable battery of claim 39, wherein each bar-shaped protrusion is disposed within 1.0 mm of an adjacent bar-shaped protrusion.

42. The cylindrical lithium rechargeable battery of claim 39, wherein each bar-shaped protrusion is disposed at least 1.0 mm from an adjacent bar-shaped protrusion.

43. The cylindrical lithium rechargeable battery of claim 38, wherein the group of protrusions comprises a matrix shape.

44. The cylindrical lithium rechargeable battery of claim 43, wherein the group of protrusions has a length of at least 20% of the diameter of the lower plate.

45. The cylindrical lithium rechargeable battery of claim 38, wherein the group of protrusions is disposed in approximately the middle of the lower plate.