Secondary battery
A secondary battery includes: a power generation element; and an exterior part that houses the power generation element in the exterior part. The exterior part includes a cylindrical section that includes opening portions on two opposing sides, cover terminals that are disposed in the respective opening portions, and resins respectively disposed between the cylindrical section and the cover terminals. The cylindrical section and the cover terminals are respectively integrated with the resins. Power collectors of the power generation element are electrically connected with the cover terminals, respectively.
1 . A secondary battery comprising:
a power generation element; and
an exterior part that houses the power generation element in the exterior part, wherein:
the exterior part includes a cylindrical section that includes opening portions on two opposing sides, cover terminals that are disposed in the respective opening portions, and resins respectively disposed between the cylindrical section and the cover terminals;
the cylindrical section and the cover terminals are respectively integrated with the resins;
power collectors of the power generation element are electrically connected with the cover terminals, respectively, and
the cylindrical section has a tubular shape with a rectangular cross-section, a portion of the cover terminals being located inside the cylindrical section, the portion having a width smaller than a width of the cylindrical section thereby forming a gap between the portion and the cylindrical section, the gap being filled by the resins.
2 . The secondary battery according to claim 1 , wherein a width or a thickness of each of the cover terminals is less than or equal to a width or a thickness of the power generation element.
3 . The secondary battery according to claim 1 , wherein regarding a relationship of a thickness of the cylindrical section, a thickness of an inner surface of the cylindrical section, a thickness of the power generation element, and thicknesses of the cover terminals, the thickness of the inner surface of the cylindrical section is less than the thickness of the cylindrical section, the thickness of the power generation element is equal to or less than the thickness of the inner surface of the cylindrical section, and the thicknesses of the cover terminals are less than or equal to the thickness of the power generation element.
4 . The secondary battery according to claim 1 , wherein regarding a relationship of the width of the cylindrical section, a width of an inner surface of the cylindrical section, a width of the power generation element, and widths of the cover terminals, the width of the inner surface of the cylindrical section is less than the width of the cylindrical section, the width of the power generation element is equal to or less than the width of the inner surface of the cylindrical section, and the widths of the cover terminals are less than or equal to the width of the power generation element.
5 . The secondary battery according to claim 1 , wherein the power collectors are curved and electrically connected with the cover terminals, respectively.
6 . The secondary battery according to claim 1 , wherein:
the power generation element includes at least one of the power collectors;
an inner surface of the cover terminal includes at least one slit portion; and
the power collector is disposed in the slit portion, and the power collector is electrically connected with the cover terminal.
7 . The secondary battery according to claim 1 , wherein an insulation sheet is disposed between the power generation element and each of the cover terminals.
8 . The secondary battery according to claim 1 , wherein:
the cover terminals respectively include projection portions that projects outward; and
the resin is disposed on at least a part of an outer circumferential surface of each of the projection portions.
9 . The secondary battery according to claim 1 , wherein the cover terminals include protrusion portions that protrude inward from end portions of inner surfaces of the cover terminals.
10 . The secondary battery according to claim 1 , wherein:
the exterior part includes a second resin filled in the exterior part; and
the cylindrical section, the cover terminals, and the power generation element are integrated with the second resin.
11 . The secondary battery according to claim 1 , wherein the cylindrical section is a cylindrical metal body or a metal laminate film which is formed into a cylindrical shape.
12 . The secondary battery according to claim 1 , wherein:
the cylindrical section is constituted of two metal plates and a third resin;
the metal plates each includes bottom surface and a protrusion portion that protrudes in the same direction from opposing end portions of the bottom surface;
the metal plates are superimposed upside down;
the protrusion portion is superimposed on each of opposing side surfaces of the cylindrical section;
the third resin is disposed to cover each of the side surfaces of the cylindrical section; and
the end portions of the superimposed metal plates are integrated with the third resin.
13 . The secondary battery according to claim 1 , wherein:
the cylindrical section is constituted of one metal plate and a third resin;
the metal plate is formed into a cylindrical shape;
an end portion of the metal plate is superimposed on one side surface of the cylindrical section, and the third resin is disposed to cover the side surface on which the end portions is superimposed; and
the end portion of the superimposed metal plate is integrated with the third resin.