Cap plate and secondary battery
The present disclosure provides a cap plate and a secondary battery. The cap plate includes a main portion and a first protruding portion. The main portion includes a first exterior surface, a second exterior surface and a third exterior surface, the third exterior surface is a curved surface. The first protruding portion includes a fourth exterior surface extending downwardly from a bottom end of the third exterior surface, the fourth exterior surface is inclined inwardly relative to the third exterior surface. The secondary battery comprises the cap plate and a case. The case includes an opening; the cap plate is provided to the opening, the main portion is fixed to an inner wall of the case. The first protruding portion is received in the case, and a gap is provided between the fourth exterior surface and the inner wall, a dimension of the gap increases gradually along a downward direction.
1. A secondary battery, wherein
the secondary battery comprises a cap plate and a case;
the cap plate includes a main portion and a first protruding portion;
the main portion includes a first exterior surface, a second exterior surface and a third exterior surface which are formed along a periphery of the main portion, the third exterior surface is a curved surface and connects the first exterior surface and the second exterior surface;
the first exterior surface is provided as two in number, the second exterior surface is provided as two in number, the first exterior surfaces and the second exterior surfaces are alternately provided along the periphery of the main portion, the third exterior surfaces is provided as four in number, the third exterior surfaces each are provided between each first exterior surface and each second exterior surface adjacent to the first exterior surface;
the first protruding portion is provided as four in number and positioned below the main portion, and each first protruding portion includes a fourth exterior surface extending downwardly from a bottom end of one corresponding third exterior surface, each fourth exterior surface is inclined inwardly relative to the one corresponding third exterior surface;
the case includes an opening in a top thereof, a shape of the opening is fitted with a shape of the periphery of the main portion;
the cap plate is provided to the opening of the case, and the main portion of the cap plate is fixed to an inner wall of the case;
the first protruding portion of the cap plate is received in the case, and a gap is provided between the fourth exterior surface and the inner wall of the case, a dimension of the gap increases gradually along a downward direction;
the cap plate further comprises a third protruding portion provided to the main portion, and the third protruding portion is directly attached on a top surface of the case;
the third protruding portion extends outwardly from the first exterior surfaces, the second exterior surfaces and the third exterior surfaces, and the periphery of the main portion is encircled by the third protruding portion; and
the case is made of plastic,
there is an interference fit between a periphery of the main portion defined by the first exterior surfaces, the second exterior surfaces and the third exterior surfaces of the main portion of the cap plate and the inner wall of the case whereby the opening of the case is expanded when the first protruding portion of the cap plate is received in the case.
2. The secondary battery according to claim 1 , wherein
the first exterior surfaces, the second exterior surfaces and the third exterior surfaces of the main portion of the cap plate are fixed to the inner wall of the case by laser welding.
3. The secondary battery according to claim 1 , wherein
lengths of lines respectively generated at intersections of the fourth exterior surface and planes perpendicular to an up-down direction gradually decrease from top to bottom.
4. The secondary battery according to claim 3 , wherein the lines are circular arcs.
5. The secondary battery according to claim 1 , wherein
the fourth exterior surface is generated by a second generatrix rotating around an axis, and the axis is parallel to an up-down direction, an angle between the second generatrix and the axis ranges from 5 degrees to 45 degrees.
6. The secondary battery according to claim 1 , wherein
the cap plate further includes a second protruding portion provided below the main portion, the second protruding portion includes a fifth exterior surface extending downwardly from a bottom end of the first exterior surface, the fifth exterior surface is inclined inwardly relative to the first exterior surface;
an end of the second protruding portion is connected with the first protruding portion, and the fifth exterior surface of the second protruding portion is connected with the fourth exterior surface of the first protruding portion.