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CN-122025938-A - Battery and cover thereof

CN122025938ACN 122025938 ACN122025938 ACN 122025938ACN-122025938-A

Abstract

The invention discloses a battery and a cover body thereof, wherein the cover body of the battery comprises a body, an explosion-proof score line is arranged on one side of the body in the thickness direction of the body, a plurality of protrusions are arranged on the other side of the body in the thickness direction of the body, the body is used for being connected with an open end of a shell of the battery and used as a current collecting structure of one side of the battery, which is not provided with a pole, the protrusions are used for being welded with a winding core of the battery, a part of the protrusions are first protrusions, the other part of the protrusions are second protrusions, the first protrusions are positioned on one side, close to the center of the body, of the explosion-proof score line, and the second protrusions are positioned on one side, close to the outer edge of the body, of the explosion-proof score line. The cover body of the battery can simplify the assembly process and reduce the internal resistance and heat of the winding core.

Inventors

  • FAN WENGUANG

Assignees

  • 常州长晟创新科技有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A cover (1) of a battery (1000), comprising: The battery pack comprises a body (11), wherein an explosion-proof score line (111) is arranged on one side of the body (11) in the thickness direction, a plurality of protrusions (112) are arranged on the other side of the body (11) in the thickness direction, the body (11) is used for being connected with the open end of a shell (2) of the battery (1000) and used as a current collecting structure on one side of the battery (1000) where a pole (7) is not arranged, and the protrusions (112) are used for being welded with a winding core (3) of the battery (1000); Wherein, a part protruding (112) is first protruding (1121), and another part protruding (112) is second protruding (1122), first protruding (1121) are located explosion proof line (111) are close to the one side of the center of body (11), second protruding (1122) are located explosion proof line (111) are close to one side of the outward flange of body (11).
  2. 2. The cover (1) of a battery (1000) according to claim 1, wherein the body (11) is a circular plate.
  3. 3. The cover (1) of a battery (1000) according to claim 2, wherein at least one of the first protrusions (1121) and the second protrusions (1122) simultaneously pass through a virtual circle drawn with the center of the body (11) as the origin and are staggered.
  4. 4. A cover (1) of a battery (1000) according to claim 3, wherein the explosion-proof score line (111) comprises: A first arc-shaped section (1111), an opening end of the first arc-shaped section (1111) facing a center position of the body (11), the first arc-shaped section (111) corresponding to the first protrusion (1121); A second arc-shaped section (1112), an opening end of the second arc-shaped section (1112) faces to an outer edge position of the body (11), and the second arc-shaped section (1112) corresponds to the second protrusion (1122).
  5. 5. The cover (1) of a battery (1000) according to claim 4, wherein the shape of the explosion-proof score line (111) is annular and the center coincides with the center of the body (11), and the maximum diameter of the explosion-proof score line (111) is greater than 1/2 of the diameter of the body (11).
  6. 6. The cover (1) of a battery (1000) according to claim 2, wherein the shape of the protrusion (112) is elongated in the radial direction of the body (11), and/or both ends of the protrusion (112) are arcuate surfaces.
  7. 7. The cover (1) of a battery (1000) according to claim 3 or 4, characterized in that all the protrusions (112) on the body (11) constitute an axisymmetric structure or a centrosymmetric structure; or three protrusions (112) positioned on one side of the explosion proof line (111) close to the outer edge of the body (11) form an equilateral triangle, and the center of the body (11) is used as the center of the equilateral triangle; Or three protrusions (112) on one side of the explosion proof score line (111) near the center of the body (11) form an equilateral triangle, and the center of the body (11) is used as the center of the equilateral triangle; or a plurality of the protrusions (112) positioned on one side of the explosion proof line (111) close to the outer edge of the body (11) form an axisymmetric structure or a centrosymmetric structure; Or three protrusions (112) located on one side of the explosion proof score line (111) near the center of the body (11) form an axisymmetric structure or a centrosymmetric structure.
  8. 8. The cover (1) of a battery (1000) according to claim 1, wherein the body (11) is provided with grooves (113) on one side in the thickness direction thereof, the grooves (113) and the protrusions (112) are in one-to-one correspondence in the thickness direction of the body (11), the thickness of the body (11) at positions where the explosion-proof score lines (111) are not provided and the protrusions (112) is H1, the thickness of the body (11) at positions where the explosion-proof score lines (111) are provided is H2, and the thickness of the body (11) at positions where the protrusions (112) are provided is H3, and H1 is not less than H3> H2.
  9. 9. The lid (1) of the battery (1000) according to claim 1, wherein the body (11) is provided with a through-hole (114) in a thickness direction thereof, and the hole (114) is offset from the protrusion (112) and the explosion-proof score line (111), respectively.
  10. 10. A battery (1000), characterized by comprising: a shell (2), wherein one end of the shell (2) is provided with an open end, and the other end is provided with a pole (7); A winding core (3) and a current collector (4), wherein the winding core (3) is positioned in the shell (2), and the current collector (4) is welded with one end of the winding core (3), the pole (7) and the shell (2) respectively; The cover body (1), the open end is located to the cover body (1), the cover body (1) is the cover body (1) of any one of claims 1-9, the cover body (1) respectively with the other end of reel core (3), casing (2) welding.

Description

Battery and cover thereof Technical Field The invention relates to the technical field of batteries, in particular to a battery and a cover body thereof. Background Along with the continuous improvement of the requirements of users on the battery capacity, such as the capacity, the multiplying power performance and the cost performance of the large cylindrical winding core, the internal space utilization rate of the battery, especially the internal space utilization rate of the structural design of the large cylindrical winding core, is also continuously increased. The current large cylindrical winding core structural design generally needs to connect copper aluminum foil current collectors to current collecting discs respectively, then the positive electrode current disc and the negative electrode current disc are connected to a pole column or a shell respectively, and finally a cover body is installed and welded. First, the current collecting plate and its connecting members occupy the internal space of the winding core and produce ohmic internal resistance to reduce rate capability. And secondly, a welding process is required to be carried out for each connection, so that the efficiency and the yield of the winding core assembly process are greatly limited, and the production cost is increased. Disclosure of Invention An object of the present invention is to provide a battery and a cover thereof, which at least can solve the problem that a current collecting disc occupies an inner space of a winding core in the prior art. In order to achieve the above object, the present invention provides the following technical solutions. The cover body of the battery comprises a body, wherein an explosion-proof score line is arranged on one side of the body in the thickness direction of the body, a plurality of protrusions are arranged on the other side of the body in the thickness direction of the body, the body is used for being connected with an open end of a shell of the battery and used as a current collecting structure of one side of the battery, which is not provided with a pole, the protrusions are used for being welded with a winding core of the battery, a part of the protrusions are first protrusions, a part of the protrusions are second protrusions, the first protrusions are located on one side, close to the center of the body, of the explosion-proof score line, and the second protrusions are located on one side, close to the outer edge of the body, of the explosion-proof score line. Optionally, the body is a circular plate. Optionally, at least one of the first protrusion and the second protrusion simultaneously pass through a virtual circle drawn by taking the center of the circle of the body as an origin and are staggered. Optionally, the explosion-proof scribing line comprises a first arc-shaped section, an opening end of the first arc-shaped section faces to the center position of the body, the first arc-shaped section corresponds to the first protrusion, and a second arc-shaped section, an opening end of the second arc-shaped section faces to the outer edge position of the body, and the second arc-shaped section corresponds to the second protrusion. Optionally, the shape of the explosion-proof score line is annular, the center of the explosion-proof score line coincides with the center of the circle of the body, and the maximum diameter of the explosion-proof score line is greater than 1/2 of the diameter of the body. Optionally, the protrusion is strip-shaped in the radial direction of the body, and/or two ends of the protrusion are arc-shaped surfaces. Optionally, all the protrusions on the body form an axisymmetric structure or a central symmetric structure, or three protrusions on one side of the explosion-proof line close to the outer edge of the body form an equilateral triangle, the center of the body is taken as the center of the equilateral triangle, or three protrusions on one side of the explosion-proof line close to the center of the body form an equilateral triangle, the center of the body is taken as the center of the equilateral triangle, or a plurality of protrusions on one side of the explosion-proof line close to the outer edge of the body form an axisymmetric structure or a central symmetric structure, or three protrusions on one side of the explosion-proof line close to the center of the body form an axisymmetric structure or a central symmetric structure. Optionally, the body is equipped with the recess in one side of self thickness direction, the recess with protruding being in the thickness direction of body one-to-one, do not set up on the body explosion-proof line and the thickness of bellied position is H1, set up on the body the thickness of explosion-proof line position is H2, set up on the body the thickness of bellied position is H3, H1 is greater than or equal to H3> H2. Optionally, the body is provided with the notes liquid hole that link up in self thickness direction,