Lithium secondary battery
A lithium secondary battery has protrusions or depressions formed on a surface of a gasket, which makes contact with a safety vent, so that gas, which is generated inside the battery, and an electrolyte, do not leak, thereby improving the safety.
1. A lithium secondary battery, comprising:
an electrode assembly;
a can to contain the electrode assembly, having an opening;
a safety vent disposed in the opening of the can, over the electrode assembly, having an inner surface that faces the electrode assembly;
a gasket positioned between the safety vent and the can, so as to maintain a seal, the gasket having a protrusion and/or depression formed on a first surface of the gasket, the first surface being in direct contact with, and completely covered by, the inner surface safety vent, such that the protrusion and/or depression extends directly toward or away from the inner surface of the safety vent, respectively.
2. The lithium secondary battery as claimed in claim 1 , wherein the protrusion and/or depression has a shape of a circle having a predetermined radius about a rotation center axis of the battery.
3. The lithium secondary battery as claimed in claim 2 , wherein at least two of the protrusions and/or depressions are formed.
4. The lithium secondary battery as claimed in claim 1 , wherein the protrusion and/or depression has a shape of an embossment.
5. The lithium secondary battery as claimed in claim 2 , wherein the protrusion and/or depression has a sectional shape selected from a semi-circle, a rectangle, and a triangle.
6. The lithium secondary battery as claimed in claim 1 , further comprising a bead, wherein the gasket has another protrusion and/or depression formed on a second surface of the gasket that directly contacts the bead.
7. A lithium secondary battery comprising:
an electrode assembly;
a can to contain the electrode assembly, and comprising a bead;
a safety vent disposed over the electrode assembly, having an inner surface that faces the electrode assembly;
a gasket positioned between the safety vent and the can, so as to maintain a seal, the gasket having a protrusion and/or depression formed on a first surface of the gasket that directly contacts, and is completely covered by, the bead, such that the protrusion and/or depression extends directly toward or away from the bead, respectively.
8. The lithium secondary battery as claimed in claim 7 , wherein the protrusion and/or depression has a shape of a circle having a predetermined radius about a rotation center axis of the battery.
9. The lithium secondary battery as claimed in claim 8 , wherein at least two protrusions and/or depressions are formed.
10. The lithium secondary battery as claimed in claim 7 , wherein the protrusion and/or depression has a shape of an embossment.
11. The lithium secondary battery as claimed in claim 7 , wherein the protrusion and/or depression has a sectional shape selected from a semi-circle, a rectangle, and a triangle.
12. The lithium secondary battery as claimed in claim 1 , wherein the gasket is made of a material selected from polyethylene, polypropylene, and/or polyimide.
13. The lithium secondary battery as claimed in claim 7 , wherein the gasket is made of a material selected from polyethylene, polypropylene, and/or polyimide.
14. A battery, comprising:
a container including an open first end and a closed second end;
a cap assembly disposed in the first end of the container, having an inner surface that faces the second end of the can; and
a gasket positioned between the cap assembly and the container, to seal the container, the gasket having:
at least one protrusion and/or depression formed on a first surface of the gasket that directly contacts the inner surface of the cap assembly; and
at least one protrusion and/or depression formed on a second surface of the gasket that directly contacts the bead.
15. The battery as claimed in claim 14 , wherein the protrusions and/or the depressions have a sectional shape selected from a semi-circle, a rectangle, and a triangle.
16. The battery as claimed in claim 14 , wherein the gasket is made of a material selected from polyethylene, polypropylene, and/or polyimide.
17. The battery as claimed in claim 14 , wherein the at least one protrusion and/or depression tightly fastens, attaches, or otherwise contacts the gasket to the container and/or the gasket to the cap assembly.