Cylindrical lithium ion secondary battery
A cylindrical lithium ion secondary battery including a center pin that has a diameter greater than a diameter of a hole formed in the center of an insulating plate to reduce the noise generated by contacting the center pin with the bottom surface of the cylindrical can.
1. A cylindrical lithium ion secondary battery, comprising:
a cylindrical can;
a first insulating plate through which a first hole is formed in a center thereof, the first insulating plate being coupled to the cylindrical can;
an electrode assembly disposed on the first insulating plate, the electrode assembly being coupled to the cylindrical can;
a center pin coupled to the electrode assembly; and
a cap assembly sealing the cylindrical can,
wherein a diameter of the center pin is greater than a diameter of the first hole, and wherein the first insulating plate is between the electrode assembly and a bottom surface of the cylindrical can.
2. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the first insulating plate includes a plurality of second holes along an outer circumference of the first hole.
3. The cylindrical lithium ion secondary battery as claimed in claim 1 , further comprising a second insulating plate disposed between the electrode assembly and the cap assembly.
4. The cylindrical lithium ion secondary battery as claimed in claim 3 , wherein the second insulating plate includes a third hole, and the diameter of the center pin is greater than a diameter of the third hole.
5. The cylindrical lithium ion secondary battery as claimed in claim 4 , wherein the center pin is spaced apart from the second insulating plate.
6. The cylindrical lithium ion secondary battery as claimed in claim 4 , wherein the center pin contacts the second insulating plate.
7. The cylindrical lithium ion secondary battery as claimed in claim 4 , wherein the second insulating plate includes a plurality of electrolyte injection holes formed along an outer circumference thereof.
8. The cylindrical lithium ion secondary battery as claimed in claim 3 , wherein the center pin is spaced apart from the second insulating plate.
9. The cylindrical lithium ion secondary battery as claimed in claim 3 , wherein the center pin contacts the second insulating plate.
10. The cylindrical lithium ion secondary battery as claimed in claim 3 , wherein the second insulating plate includes a plurality of electrolyte injection holes formed along an outer circumference thereof
11. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator, and the center pin has a length less than a length of the separator and greater than a length of the negative electrode plate.
12. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator, and the center pin has a length less than a length of the separator and greater than a length of the positive electrode plate.
13. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator, and the center pin has a length less than a length of the separator.
14. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the center pin is spaced apart from the first insulating plate.
15. The cylindrical lithium ion secondary battery as claimed in claim 1 , wherein the center pin contacts the first insulating plate.