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CN-224217575-U - Battery monomer and battery package

CN224217575UCN 224217575 UCN224217575 UCN 224217575UCN-224217575-U

Abstract

The application discloses a battery cell and a battery pack, wherein the battery cell comprises a shell, a battery cell and a top cover assembly, a containing cavity is formed in the shell, the battery cell is arranged in the containing cavity, the containing cavity is provided with a cavity opening, the top cover assembly comprises a cover body and lower plastic, the cover body is arranged at the cavity opening and is connected with the shell, the lower plastic is arranged on one side of the cover body facing the containing cavity, a counter bore is formed in one side of the cover body facing the lower plastic, a connecting column is arranged on one side of the lower plastic facing the cover body, at least part of the connecting column stretches into the counter bore, the counter bore is provided with an opening and a bottom wall which are oppositely arranged, and an concave-convex structure is arranged on one side end face or the bottom wall of the connecting column facing the bottom wall. The ultrasonic energy can be concentrated during ultrasonic welding, so that the connection strength of the lower plastic and the top cover plate can be improved, and meanwhile, the top cover assembly structure is simple in processing technology and compact in structure, and the space utilization rate of the battery can be improved.

Inventors

  • ZHOU JIE
  • QIN JISHENG
  • LIN XIUDE
  • YANG WEI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (10)

  1. 1. The battery cell is characterized by comprising a shell (10), a battery cell (20) and a top cover assembly (30), wherein a containing cavity (101) is arranged in the shell (10), the battery cell (20) is arranged in the containing cavity (101), and the containing cavity (101) is provided with an cavity opening; The top cover assembly (30) comprises a cover body (31) and lower plastic (32), the cover body (31) is arranged at the cavity opening and is connected with the shell (10), the lower plastic (32) is arranged at one side of the cover body (31) facing the accommodating cavity (101), a counter bore (310) is formed in one side of the cover body (31) facing the lower plastic (32), a connecting column (321) is arranged at one side of the lower plastic (32) facing the cover body (31), the connecting column (321) at least partially stretches into the counter bore (310), the counter bore (310) is provided with an opening (311) and a bottom wall (312) which are oppositely arranged, and a concave-convex structure (30 a) is formed in one side end face of the connecting column (321) facing the bottom wall (312) or the bottom wall (312).
  2. 2. The battery cell according to claim 1, wherein the counter bore (310) further comprises a side wall (313), the side wall (313) is arranged between the opening (311) and the bottom wall (312), a protruding portion (316) protruding into the counter bore (310) is arranged on the side wall (313), a gap (317) is formed between the protruding portion (316) and the bottom wall (312) along the thickness direction of the cover body (31), and the connecting post (321) is at least partially embedded in the gap (317).
  3. 3. The battery cell of claim 1, wherein the bottom wall (312) has a surface roughness greater than or equal to 1.6 μιη; And/or the surface roughness of the connecting post (321) towards one side end surface of the bottom wall (312) is greater than or equal to 1.6 μm.
  4. 4. The battery cell of claim 1, wherein the bottom wall (312) is planar, the bottom wall (312) protruding at least partially into the counterbore (310) to form the relief structure (30 a); Or, the bottom wall (312) is at least partially recessed toward a direction away from the cover body (31) to form the concave-convex structure (30 a).
  5. 5. The battery cell according to claim 1, wherein the bottom wall (312) protrudes from edge to center toward the cover (31).
  6. 6. The battery cell of any one of claims 1-5, wherein the bottom wall (312) is further provided with a plurality of channels (315), and the connecting post is at least partially embedded in the channels (315).
  7. 7. The battery cell of claim 6, wherein the plurality of flow channels (315) are radially distributed around the center of the bottom wall (312) or the plurality of flow channels (315) are staggered.
  8. 8. The battery cell of claim 6, wherein the flow channel extends from the center of the bottom wall (312) to the edge, and the flow cross-sectional area of the flow channel (315) increases from the center of the flow channel (315) to the edge.
  9. 9. The battery cell of claim 6, wherein the bottom wall (312) is further provided with a boss (314) at a central location.
  10. 10. A battery pack comprising the battery cell of any one of claims 1-9.

Description

Battery monomer and battery package Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery monomer and a battery pack. Background With the increasing prominence of environmental problems, low-carbon economy has become the mainstream of future economic development, new energy will gradually replace traditional environmental pollution type energy, and power batteries as the representatives of new energy are also gradually applied and focused. The top cover component of the power battery comprises a top cover piece and lower plastic, the top cover piece and the lower plastic are required to be connected and fixed, and the top cover piece and the lower plastic are mainly fixed through the combination of a plurality of parts, so that the lower plastic is complex in assembly process, low in production efficiency and high in assembly cost. Disclosure of utility model The application aims to provide a battery monomer and a battery pack, which can solve the problems of complex assembly process, low production efficiency and high assembly cost of a top cover assembly in the existing battery. In order to solve the technical problems, the application is realized as follows: In a first aspect, the embodiment of the application provides a battery cell, which comprises a shell, an electric core and a top cover assembly, wherein a containing cavity is arranged in the shell, the electric core is arranged in the containing cavity, and the containing cavity is provided with an cavity opening; The top cover assembly comprises a cover body and lower plastic, the cover body is arranged at the cavity opening and is connected with the shell, the lower plastic is arranged on one side of the cover body, which faces the accommodating cavity, a counter bore is formed in one side of the cover body, which faces the lower plastic, a connecting column is arranged on one side of the lower plastic, which faces the cover body, and at least part of the connecting column stretches into the counter bore, the counter bore is provided with an opening and a bottom wall which are oppositely arranged, and a concave-convex structure is arranged on one side end face, which faces the bottom wall, of the connecting column or the bottom wall. Optionally, the counter bore is further provided with a side wall, the side wall is arranged between the opening and the bottom wall, a protruding portion protruding into the counter bore is arranged on the side wall, a gap is formed between the protruding portion and the bottom wall along the thickness direction of the cover body, and the connecting column is at least partially embedded into the gap. Optionally, the surface roughness of the bottom wall is greater than or equal to 1.6 μm; And/or the surface roughness of the end face of the connecting column facing the bottom wall is greater than or equal to 1.6 mu m. Optionally, the bottom wall is a plane, and at least part of the bottom wall protrudes towards the inside of the counter bore to form the concave-convex structure; Or, the bottom wall is at least partially recessed away from the cover body to form the concave-convex structure. Optionally, the bottom wall protrudes from edge to center toward the cover. Optionally, the height difference between the center and the edge of the bottom wall is H along the thickness direction of the cover body, and the distance between the center and the edge of the bottom wall is L along the radial direction of the counter bore, so that the L/H is more than or equal to 1 and less than or equal to 10. Optionally, the height difference H between the center and the edge of the bottom wall in the thickness direction of the cover body is 0.05 mm-0.5 mm; And/or, the distance L between the center and the edge of the bottom wall along the radial direction of the counter bore is more than or equal to 0.5mm and less than or equal to 5mm. Optionally, the bottom wall is further provided with a plurality of diversion trenches, and the connecting column is at least partially embedded into the diversion trenches; optionally, the battery cell satisfies at least one of the following conditions: A. the plurality of diversion trenches are distributed radially around the center of the bottom wall; B. The diversion trenches are distributed in a staggered manner; C. The diversion trench extends from the center of the bottom wall to the edge, and the flow cross section of the diversion trench from the center of the bottom wall to the edge is in an increasing trend; D. The center of the bottom wall is also provided with a boss. In a second aspect, an embodiment of the present application provides a battery pack, including the battery cell according to the first aspect. In the embodiment of the application, the battery cell is arranged in the accommodating cavity of the shell, the top cover assembly is covered at the cavity opening of the accommodating cavity, the top cover assembly comprise