Secondary battery and device including the same
A secondary battery includes a jelly roll electrode assembly in which a cathode sheet, an anode sheet, and a separator interposed between the cathode sheet and the anode sheet are wound together. The secondary battery also includes a battery case to which the jelly roll electrode assembly is mounted. The battery case is configured such that a flow path recessed toward the center of the jelly roll electrode assembly is formed in the lower part of the battery case. The flow path includes a first flow path and a second flow path located in the center of the first flow path, and wherein an upper part of the second flow path is opened toward the upper part of the first flow path.
1 . A secondary battery comprising:
a jelly roll electrode assembly in which a cathode sheet, an anode sheet, and a separator interposed between the cathode sheet and the anode sheet are wound together; and
a battery case to which the jelly roll electrode assembly is mounted,
wherein the battery case is configured such that a flow path recessed toward a center of the jelly roll electrode assembly is formed in a lower part of the battery case,
wherein the flow path is defined by a first flow path element and a second flow path element located in a center of the first flow path element, and
wherein an upper part of the second flow path element is opened toward an upper part of the first flow path element; and
wherein the secondary battery further comprises at least one connecting part connecting the first flow path element to the second flow path element.
2 . The secondary battery of claim 1 , wherein:
a protrusion is formed in at least any one of the first flow path element and the second flow path element.
3 . The secondary battery of claim 2 , wherein:
the protrusion is formed on the first flow path element.
4 . The secondary battery of claim 3 , wherein:
the protrusion comprises at least two protrusions.
5 . The secondary battery of claim 4 , wherein:
the protrusion is formed of a cooling fin.
6 . The secondary battery of claim 4 , wherein:
the at least two protrusions are spaced apart from each other by the same distance.
7 . The secondary battery of claim 4 , wherein:
the protrusions are formed in a linear shape or a semicircular shape.
8 . Secondary battery of claim 1 , wherein:
a diameter of the first flow path element is smaller than a diameter of a center of the jelly roll electrode assembly.
9 . The secondary battery of claim 8 , wherein:
a height of the first flow path element and the second flow path element is smaller than a height of the jelly roll electrode assembly.
10 . The secondary battery of claim 1 , wherein:
a nozzle is connected to a lower part of the second flow path element, and
a positive or negative pressure is applied from the nozzle to an inside of the second flow path element.
11 . The secondary battery of claim 1 , wherein:
the at least one connecting part comprises two connection parts located between the first flow path element and the second flow path element.
12 . The secondary battery of claim 11 , wherein:
the connection part is extended from a lower part to an upper part of the first flow path element or the second flow path element.
13 . A device comprising the secondary battery as set forth in claim 1 .