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CN-122026010-A - Bus plate, battery pack and electricity utilization device

CN122026010ACN 122026010 ACN122026010 ACN 122026010ACN-122026010-A

Abstract

The invention discloses a confluence disc, a battery pack and an electricity utilization device, wherein the confluence disc comprises a disc body, the diameter of the disc body is D1, a welding part is connected to the outer peripheral side of the disc body, the welding part comprises a welding section, the welding section extends along the circumferential direction of the disc body and is perpendicular to the disc body, the diameter of a cylindrical surface where the outer surface of the welding section is located is D2, and the requirement that D2/D1 is more than or equal to 1 and less than or equal to 10 is met. According to the confluence disc, the ratio D2/D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section is positioned and the diameter D1 of the disc body is enabled to be 1-10, so that the gap size formed between the welding part and the inner peripheral wall of the shell can be increased, the electrolyte locally accumulated in the rolling groove area has larger space and is communicated with the electrolyte at other positions in the shell, reverse flow is realized, accumulation of the electrolyte at the rolling groove is avoided, corrosion to a nickel layer of the battery shell is reduced, and the service life of the battery is prolonged.

Inventors

  • Guo Chunchi
  • YAN BO

Assignees

  • 惠州亿纬动力电池有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (14)

  1. 1. A confluence plate, characterized by comprising: The device comprises a disc body (1), wherein the diameter of the disc body (1) is D1; The welding part (2), the welding part (2) connect in the periphery side of disk body (1), welding part (2) include welded section (21), welded section (21) follow the circumference direction of disk body (1) extend and with disk body (1) are perpendicular, the diameter of the surface cylindrical surface that welded section (21) is located is D2, and satisfies that 1 is less than or equal to D2/D1 is less than or equal to 10.
  2. 2. The confluence plate according to claim 1, wherein the welding portion (2) further comprises a connecting section (22), and both ends of the connecting section (22) are connected with an outer peripheral side of the plate body (1) and one end of the welding section (21) close to the plate body (1) in an axial direction of the plate body (1), respectively.
  3. 3. The busbar disc according to claim 2, characterized in that the welding section (21) and the connection line of the welding section (21) and the connection section (22) are located on the same side of the disc body (1) in the axial direction.
  4. 4. A confluence disc according to claim 3, characterized in that the angle between the connecting line of the two ends of the connecting section (22) and the disc body (1) is α in the cross section passing through the axis of the disc body (1), and is satisfied that 90 ° < α <180 °.
  5. 5. The busbar disc according to claim 2, characterized in that the connecting section (22) is of a flat plate structure, a bent plate structure or a stepped structure.
  6. 6. The confluence plate according to any one of claims 1 to 5, wherein the plate body (1) is of a non-porous structure; Or, the disc body (1) is provided with through holes penetrating through the disc body (1) along the axial direction of the disc body (1), wherein the number of the through holes is one or a plurality of the through holes are arranged at intervals.
  7. 7. The confluence plate according to any one of claims 1 to 5, wherein the total arc length of the outer surface of the welding section (21) is L1, the circumference of the circle having the diameter D2 is L2, and 0.2≤l1/l2≤1 is satisfied.
  8. 8. The confluence plate according to any one of claims 1 to 5, wherein the welding section (21) is located at one side of the axial direction of the plate body (1), and a distance between a surface of the plate body (1) facing away from the welding section (21) and an end of the welding section (21) facing away from the plate body (1) is L3 along the axial direction of the plate body (1), and is 0.2 mm≤l3≤5mm.
  9. 9. The confluence plate according to any one of claims 1 to 5, wherein the welded portion (2) is a plurality of portions arranged at intervals in the circumferential direction of the plate body (1).
  10. 10. The confluence plate according to any one of claims 1 to 5, wherein the outer periphery of the plate body (1) is provided with a notch (11), and the welding portion (2) is connected to an inner wall of the notch (11).
  11. 11. A battery, comprising: a housing (20); the battery cell (30), the said battery cell (30) locates in the said body (20); The busbar disc (10) according to any one of claims 1 to 10, wherein the busbar disc (10) is arranged in the shell (20), the welding section (21) and the battery cell (30) are positioned at two opposite sides of the disc body (1) in the axial direction, the disc body (1) is welded with the battery cell (30), and the outer surface of the welding section (21) is welded with the inner peripheral wall of the shell (20); The battery pack comprises a battery cell (30), a welding section (21) and a shell (20), wherein a rolling groove (202) extending along the circumferential direction of the shell (20) is formed in the peripheral wall of the shell (20), the rolling groove (202) is located on one side, deviating from the battery cell (30), of the disc (1), one end, deviating from the disc (1), of the welding section (21) faces towards the axis of the disc (1) under the action of the rolling groove (202), a gap (3) is formed between the welding section (2) and the inner peripheral wall of the shell (20), and the gap (3) is located on one side, facing towards the battery cell (30), of the welding section (21) and the welding zone of the shell (20).
  12. 12. The battery according to claim 11, characterized in that the gap (3) is filled with a cementitious member.
  13. 13. Battery pack, characterized by comprising a battery (100) according to claim 11 or 12.
  14. 14. An electric device characterized by comprising a battery (100) according to claim 11 or 12 or a battery pack according to claim 13.

Description

Bus plate, battery pack and electricity utilization device Technical Field The invention relates to the technical field of batteries, in particular to a bus plate, a battery pack and an electric device. Background In the related art, a main body surface of a bus plate in a lithium ion battery is welded with a battery core lug, and a multi-design vertical edge structure of the bus plate is welded with the inner side wall of a shell to form an electric connection structure, so that current is conducted to the shell. When the battery cell is in a high-temperature state for a long time, the battery cell expands, and free electrolyte in the battery cell flows to a rolling groove area in the shell to gather in the battery cell. However, because the gap between the vertical and the shell of the confluence disc is too small, the gap between the vertical and the shell of the confluence disc provides a unidirectional channel for the electrolyte to be accumulated in the rolling groove area, namely the electrolyte can flow downwards from the battery core to the rolling groove area through the gap, and the electrolyte in the vertical edge area cannot flow back into the battery core through the gap in the later circulation process. The electrolyte remained at the vertical edge of the rolling groove area is stored in the rolling groove area for a long time to form island electrolyte, and the nickel layer of the shell is possibly corroded during the service life of the battery cell, so that nickel ions are dissolved out, and the long-service life of the battery cell is influenced. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the confluence disc which can increase the size of a gap formed between a welding part and the inner peripheral wall of the shell, reduce the accumulation of electrolyte at the rolling groove, reduce the corrosion to the nickel layer of the battery shell and prolong the service life of the battery. The invention also provides a battery, which comprises the bus plate. The invention further provides a battery pack, which comprises the bus plate. The invention also provides an electric device which comprises the battery or the battery pack. The confluence disc comprises a disc body and a welding part, wherein the diameter of the disc body is D1, the welding part is connected to the outer peripheral side of the disc body, the welding part comprises a welding section, the welding section extends along the circumferential direction of the disc body and is perpendicular to the disc body, the diameter of a cylindrical surface where the outer surface of the welding section is located is D2, and the requirement that D2/D1 is more than or equal to 1 and less than or equal to 10 is met. According to the confluence disc provided by the embodiment of the invention, the ratio D2/D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section is positioned and the diameter D1 of the disc body is 1-10, so that the gap size formed between the welding part and the inner peripheral wall of the shell can be increased, the electrolyte locally reserved in the rolling groove area has larger space and is communicated with the electrolyte at other positions in the shell, reverse flow is realized, the electrolyte is prevented from being reserved at the rolling groove, the corrosion to the nickel layer of the battery shell is reduced, and the service life of the battery is prolonged. According to some embodiments of the invention, the welding part further includes a connection section, both ends of which are connected to an outer peripheral side of the disc body and one end of the welding section near the disc body in an axial direction of the disc body, respectively. In some embodiments of the invention, the welding segment and the connection line of the welding segment and the connection segment are located on the same side of the disc body in the axial direction. In some embodiments of the invention, the angle between the line connecting the ends of the connecting section and the disc is alpha in a cross section passing through the axis of the disc, and is 90 deg. < alpha <180 deg.. In some embodiments of the invention, the connection section is a flat plate structure, a bent plate structure, or a stepped structure. In some embodiments of the invention, the tray body is of a non-porous structure, or the tray body is provided with through holes penetrating through the tray body along the axial direction of the tray body, wherein the through holes are one or a plurality of through holes arranged at intervals. In some embodiments of the invention, the total arc length of the outer surface of the welding segment is L1, the circumference of the circle with the diameter D2 is L2, and 0.2≤L1/L2≤1 is satisfied. In some embodiments of the present invention, the welding section is locate