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CN-224232764-U - Single battery and battery pack

CN224232764UCN 224232764 UCN224232764 UCN 224232764UCN-224232764-U

Abstract

The application discloses a single battery and a battery pack, and belongs to the technical field of batteries. The single battery comprises a cover plate assembly and an electrode assembly, wherein the cover plate assembly comprises a cover plate body, a pole column and a connecting block, the cover plate body is provided with an assembly hole, the pole column comprises a first connecting part, a main body part and a second connecting part, the main body part penetrates through the assembly hole, the first connecting part is arranged on one side, away from the electrode assembly, of the cover plate body and surrounds the main body part, the second connecting part is arranged on one side, facing the electrode assembly, of the main body part, a limiting groove is formed by the second connecting part and the main body part in a surrounding mode, the connecting block is arranged on one side, away from the first connecting part, of the cover plate body, and is partially embedded in the limiting groove, the cover plate body is clamped between the first connecting part and the connecting block, and on a plane perpendicular to the thickness direction, the orthographic projection of the second connecting part and the connecting block is provided with an overlapping area, and the radial width dimension of the overlapping area is W, so that W is more than or equal to 0.15 and less than or equal to 1. The pole is high in assembly firmness and stability, and is not easy to fail and fall off.

Inventors

  • YUAN YUE
  • Yan Huailei
  • ZHAO LE

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250324

Claims (10)

  1. 1. A unit cell characterized by comprising a cover plate assembly (1) and an electrode assembly (2), wherein the electrode assembly (2) is arranged on one side of the cover plate assembly (1) in the thickness direction (X) thereof; The cover plate assembly (1) comprises: a cover plate body (11) provided with an assembly hole (110) along the thickness direction (X); The electrode post (12) comprises a first connecting part (122), a main body part (121) and a second connecting part (123), wherein the main body part (121) penetrates through the assembly hole (110), the first connecting part (122) is arranged on one side, deviating from the electrode assembly (2), of the cover plate body (11) and is connected with the main body part (121) in a surrounding mode, the second connecting part (123) is arranged on one side, facing the electrode assembly (2), of the main body part (121), and a limiting groove (124) is formed by the second connecting part (123) and the main body part (121) in a surrounding mode; The connecting block (13) is arranged on one side, far away from the first connecting part (122), of the cover plate body (11), and is partially embedded in the limiting groove (124), and the cover plate body (11) is clamped between the first connecting part (122) and the connecting block (13); On a plane perpendicular to the thickness direction (X), the orthographic projection of the second connecting part (123) and the connecting block (13) has an overlapping area, and the radial width dimension of the overlapping area is W mm, so that W is more than or equal to 0.15 and less than or equal to 1.
  2. 2. The unit cell according to claim 1, characterized in that the second connecting portion (123) is circumferentially disposed around and encloses a receiving groove (120) with the main body portion (121).
  3. 3. The unit cell according to claim 2, wherein the second connection portion (123) includes a base section (1231) and a caulking section (1232), the base section (1231) being connected to the main body portion (121), the caulking section (1232) being connected to an end of the base section (1231) remote from the main body portion (121) and protruding in a direction away from the receiving groove (120); The connecting block (13) comprises a convex part (131), the convex part (131) is embedded in the limiting groove (124), and the convex part (131) is abutted with the riveting section (1232) in the thickness direction (X).
  4. 4. A cell according to claim 3, wherein the rivet section (1232) has a first step surface (1230), the first step surface (1230) being located on a side of the rivet section (1232) facing away from the receiving groove (120); The convex portion (131) has a second step surface (1310), the second step surface (1310) being disposed opposite to the first step surface (1230); The cover plate assembly (1) further comprises welding parts (14), and the welding parts (14) are respectively connected with the first step surface (1230) and the second step surface (1310).
  5. 5. A cell according to claim 3, wherein the base section (1231) has a diameter-width dimension W 1 mm in a plane perpendicular to the thickness direction (X), satisfying 1.0-W 1 -1.5; Along the thickness direction (X), the riveting section (1232) has a thickness dimension L mm, which satisfies that L is more than or equal to 0.35 and less than or equal to 0.6; And/or, in the thickness direction (X), the connection block (13) has a thickness dimension L 1 mm, and the protrusion (131) has a thickness dimension L 2 mm, satisfying that 0.65≤L 1 ≤1.5,0.2≤L 2 ≤0.8.
  6. 6. The unit cell according to claim 1, wherein in the thickness direction (X), the main body portion (121) has a thickness dimension L 3 mm, the first connecting portion (122) has a thickness dimension L 4 mm, and the second connecting portion (123) has a thickness dimension L 5 mm, satisfying that 2.0≤l 3 ≤3.0,1.5≤L 4 ≤2,1.1≤L 5 ≤2.1.
  7. 7. The unit cell according to claim 1, wherein the cover plate assembly (1) further comprises a sealing member (15), the sealing member (15) comprises a first sealing section (151), a second sealing section (152) and a third sealing section (153), the first sealing section (151) is arranged between the main body part (121) and the cover plate body (11), the second sealing section (152) is clamped between the cover plate body (11) and the connecting block (13), the third sealing section (153) is embedded in the limiting groove (124), and is clamped between the main body part (121) and the connecting block (13), and the first sealing section (151) is respectively connected with the second sealing section (152) and the third sealing section (153).
  8. 8. The unit cell according to claim 2, wherein the electrode assembly (2) further comprises an electrode body (21) and a tab (22), the tab (22) comprises a first section (221) and a second section (222) connected to each other, the first section (221) is connected to the electrode body (21) and extends partially into the receiving groove (120), and the second section (222) is connected to an end of the first section (221) remote from the electrode body (21) and is connected to one side of the body portion (121) in the thickness direction (X).
  9. 9. The single battery according to claim 1, wherein a sinking groove (111) is formed in one side of the cover plate body (11) facing the connecting block (13), and the sinking groove (111) is communicated with the assembly hole (110) and the limiting groove (124); The sink groove (111) has a first wall (1111) facing the connection block (13), the limit groove (124) has a second wall (1211) facing the connection block (13), and the first wall (1111) and the second wall (1211) are on the same plane perpendicular to the thickness direction (X).
  10. 10. A battery pack comprising the single battery according to any one of claims 1 to 9.

Description

Single battery and battery pack Technical Field The application belongs to the technical field of batteries, and particularly relates to a single battery and a battery pack. Background The single battery comprises a shell, an electrode assembly and a cover plate assembly, wherein the cover plate assembly is used for covering and sealing the shell, and a pole is borne on the cover plate assembly. However, the assembly of the posts in the cover assembly with the cover body is prone to failure. Disclosure of utility model The embodiment of the utility model aims to provide a single battery, which aims to solve the technical problem that the assembly of a pole in the current single battery is easy to fail, and the other aim of the embodiment of the utility model is to provide a battery pack. The single battery provided by the embodiment of the application comprises a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly in the thickness direction; The cover plate assembly includes: the cover plate body is provided with an assembly hole along the thickness direction; The electrode post comprises a first connecting part, a main body part and a second connecting part, wherein the main body part penetrates through the assembly hole, the first connecting part is arranged on one side, away from the electrode assembly, of the cover plate body and is connected with the main body part in a surrounding mode, the second connecting part is arranged on one side, facing the electrode assembly, of the main body part, and a limiting groove is formed by the second connecting part and the main body part in a surrounding mode; The connecting block is arranged on one side, far away from the first connecting part, of the cover plate body, and is partially embedded in the limiting groove, and the cover plate body is clamped between the first connecting part and the connecting block; On a plane perpendicular to the thickness direction, the orthographic projection of the second connecting part and the connecting block is provided with an overlapping area, and the radial width dimension of the overlapping area is W, so that W is more than or equal to 0.15 and less than or equal to 1. In some embodiments, the second connecting portion is circumferentially disposed around and encloses a receiving slot with the main body portion; The limiting groove is arranged on the outer side of the accommodating groove in a surrounding mode. In some embodiments, the second connecting portion includes a base section and a riveting section, the base section is connected with the main body portion, and the riveting section is connected to one end of the base section away from the main body portion and protrudes toward a direction away from the accommodating groove; The connecting block comprises a protruding portion, the protruding portion is embedded in the limiting groove, and in the thickness direction, the protruding portion is abutted to the riveting section. In some embodiments, the rivet section has a first step surface on a side of the rivet section facing away from the receiving slot; the convex part is provided with a second step surface, and the second step surface is opposite to the first step surface; The cover plate assembly further comprises a welding part, and the welding part is respectively connected with the first step surface and the second step surface. In some embodiments, the base section has a radial width dimension W 1 mm in a plane perpendicular to the thickness direction, satisfying 1.0≤W 1≤1.5; The thickness of the riveting section is L mm along the thickness direction, and L is more than or equal to 0.35 and less than or equal to 0.6; And/or, in the thickness direction, the connection block has a thickness dimension L 1 mm, and the protrusion has a thickness dimension L 2 mm, satisfying 0.65≤L 1≤1.5,0.2≤L2≤0.8. In some embodiments, the body portion has a thickness dimension L 3 mm, the first connection portion has a thickness dimension L 4 mm, and the second connection portion has a thickness dimension L 5 mm along the thickness direction, satisfying 2.0≤L 3≤3.0,1.5≤L4≤2,1.1≤L5≤2.1. In some embodiments, the cover plate assembly further comprises a sealing member, the sealing member comprises a first sealing section, a second sealing section and a third sealing section, the first sealing section is arranged between the main body part and the cover plate body, the second sealing section is clamped between the cover plate body and the connecting block, the third sealing section is embedded in the limiting groove and clamped between the main body part and the connecting block, and the first sealing section is respectively connected with the second sealing section and the third sealing section. In some embodiments, the electrode assembly further includes an electrode body and a tab, the tab includes a first section and a second section connected to each o