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CN-122029692-A - Battery monomer, battery, power utilization device and energy storage device

CN122029692ACN 122029692 ACN122029692 ACN 122029692ACN-122029692-A

Abstract

A battery cell (10), a battery (100), an electrical device and an energy storage device (2000). The battery cell (10) comprises a housing (1) provided with a containing space (12), wherein the housing (1) comprises a first housing wall (11), an electrode assembly (7) at least partially arranged in the containing space (12), an electrode terminal (3) arranged on the first housing wall (11), the electrode terminal (3) provided with a terminal plate (4), the terminal plate (4) is used for being connected with a bus bar (2), the terminal plate (4) comprises a main body part (5) and at least one extension part (6) connected with the main body part (5), and the at least one extension part (6) is arranged on the main body part (5) in a protruding mode along the direction perpendicular to the wall thickness direction (Z) of the first housing wall.

Inventors

  • ZHOU WENLIN
  • CHEN WEI
  • Meng Wanqiu
  • Cai Xianghu
  • ZHENG YULIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20240521

Claims (20)

  1. A battery cell, comprising: A housing having an accommodation space, the housing including a first housing wall; An electrode assembly at least partially disposed in the receiving space; And the electrode terminal is arranged on the first shell wall and is provided with a terminal plate, the terminal plate is used for being connected with the bus piece and comprises a main body part and at least one extending part connected with the main body part, and the extending part is arranged on the main body part in a protruding mode along the wall thickness direction perpendicular to the first shell wall.
  2. The battery cell according to claim 1, wherein, Along the length direction of the first housing wall, the extension portion protrudes and is arranged in the main body portion, and the length of the extension portion is greater than that of the main body portion.
  3. The battery cell according to claim 1 or 2, wherein, The battery cell includes at least two electrode terminals including a first electrode terminal and a second electrode terminal, The first electrode terminal includes a first body portion and a first extension portion, the second electrode terminal includes a second body portion and a second extension portion, The first extension part and the second extension part extend towards one side close to each other along the length direction of the first shell wall, or The first extension part and the second extension part extend towards one side far away from each other along the length direction of the first shell wall, or The first extension portion and the second extension portion protrude toward the same side along a length direction of the first housing wall.
  4. The battery cell according to any one of claim 1 to 3, wherein, The terminal plate includes a plurality of extensions.
  5. The battery cell according to claim 4, wherein, The plurality of extension portions protrude from the same-facing side of the main body portion along a length direction of the first housing wall.
  6. The battery cell according to any one of claims 1 to 5, wherein, The ratio of the length of the extension portion to the length of the main body portion is in the range of 0.4 to 0.8 in the width direction of the first housing wall.
  7. The battery cell according to any one of claim 3 to 6, wherein, The first electrode terminal includes a first terminal plate, the second electrode terminal includes a second terminal plate, The ratio of the lengths of the first and second terminal plates to the length of the first housing wall is in the range of 0.6 to 0.9 in the width direction of the first housing wall.
  8. The battery cell according to claim 1, wherein, The terminal block includes a first terminal block including a first extension portion and a second terminal block including a second extension portion, The ratio of the length of the first extension part to the length of the first terminal plate is greater than or equal to 0.5 and less than 1 along the length direction of the first housing wall, and/or, Along the length direction of the first housing wall, the ratio of the length of the second extension portion to the length of the second terminal plate is greater than or equal to 0.5 and less than 1.
  9. The battery cell according to claim 1, wherein, The terminal plate includes a first terminal plate and a second terminal plate, The ratio of the length of the first terminal plate to the length of the first housing wall is in the range of 0.2 to 0.7 along the length direction of the first housing wall, and/or, The ratio of the length of the second terminal plate to the length of the first housing wall is in the range of 0.2 to 0.7 along the length direction of the first housing wall.
  10. The battery cell according to claim 1, wherein, The terminal plate includes a first terminal plate and a second terminal plate, The ratio of the length of the first terminal plate in the length direction of the first housing wall to the length of the first terminal plate in the width direction of the first housing wall is in the range of 3.5 to 10, and/or, The ratio of the length of the second terminal plate in the length direction of the first housing wall to the length of the second terminal plate in the width direction of the first housing wall is in the range of 3.5 to 10.
  11. The battery cell according to any one of claims 3 to 10, wherein, The first electrode terminal comprises a first terminal plate, at least part of the first terminal plate is arranged on one side of the first shell wall, which is away from the accommodating space, and the second electrode terminal comprises a second terminal plate, which is arranged on one side of the first shell wall, which is away from the accommodating space.
  12. The battery cell according to any one of claims 3 to 11, wherein, The first electrode terminal includes a first terminal plate, at least a portion of which is disposed at a side of the first case wall facing the receiving space, the second electrode terminal includes a second terminal plate, at least a portion of which is disposed at a side of the first case wall facing the receiving space, The first terminal plate is at least partially arranged between the second terminal plate and the first housing wall along the wall thickness direction of the first housing wall, or The second terminal pad is at least partially disposed between the first terminal pad and the first housing wall along a wall thickness direction of the first housing wall.
  13. The battery cell of claim 11, wherein, The first electrode terminal further includes a first terminal plate, at least a portion of which is disposed at a side of the first case wall facing the receiving space, the second electrode terminal further includes a second terminal plate, at least a portion of which is disposed at a side of the first case wall facing the receiving space, The first main body part and the first terminal plate are directly connected through a first connecting column; The second body portion and the second terminal pad are directly connected by a second connection post.
  14. The battery cell according to any one of claims 11 to 13, wherein, The electrode assembly includes first and second electrode sheets of opposite polarity, The first electrode terminal is electrically connected to the first pole piece, and the second electrode terminal is electrically connected to the second pole piece.
  15. The battery cell according to any one of claims 11 to 14, wherein, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall, and the first terminal plate abuts against the second terminal plate.
  16. The battery cell of claim 15, wherein, The first terminal plate is provided with a first protruding part, the second terminal plate is provided with a first recessed part, The first protruding portion and the first recessed portion at least partially overlap in the wall thickness direction of the first housing wall, and the first protruding portion and the first recessed portion are mutually matched.
  17. The battery cell of claim 16, wherein, The battery cell also comprises a first insulating piece, the first insulating piece is fixed with the first electrode terminal, the second electrode terminal is at least partially arranged between the first insulating piece and the first shell wall, and the first insulating piece is abutted to the second electrode terminal.
  18. The battery cell of claim 17, wherein, The first insulator portion is disposed between the first electrode terminal and the first case wall.
  19. The battery cell according to claim 17 or 18, wherein, Along the wall thickness direction of the first shell wall, the first electrode terminal, the first insulating piece and the second electrode terminal are partially overlapped, and the part of the first electrode terminal overlapped with the first insulating piece and the second electrode terminal is abutted against the first insulating piece.
  20. The battery cell according to any one of claims 12 to 19, wherein, The first extension portion is connected with the first terminal plate through a third connection post, The first concave part is arranged on one side of the second extension part facing the first electrode terminal, and the first convex part is arranged on one side of the first extension part facing the second electrode terminal.

Description

Battery monomer, battery, power utilization device and energy storage device Technical Field The disclosure relates to the technical field of batteries, in particular to a battery monomer, a battery, an electricity utilization device and an energy storage device. Background With the popularization and popularization of the green development concept, new energy batteries are increasingly used in life and industry, for example, new energy automobiles with batteries mounted therein have been widely used, and in addition, batteries are increasingly used in the energy storage field and the like. In the existing battery system, the battery comprises an electrode assembly and an electrode terminal, the electrode assembly realizes the function of supplying power through the electric connection of a tab and the electrode terminal, wherein heat at the welding position of the tab and the electrode terminal and the welding position of the internal structure of the electrode terminal is mainly transmitted to the outside through the electrode terminal, along with the increasing requirements of people on the quick charge technology of the battery, the heat dissipation requirement on the electrode terminal is also increased, and how to improve the heat dissipation effect of the electrode terminal is one of the directions studied in the industry. Disclosure of Invention In view of the above, it is desirable to provide a battery cell, a battery, an electric device, and an energy storage device that can improve the heat dissipation effect of an electrode terminal. In order to achieve the above purpose, the present disclosure adopts the following technical solutions. The first aspect of the present disclosure provides a battery cell including a case having an accommodation space, the case including a first case wall, an electrode assembly at least partially disposed in the accommodation space, an electrode terminal disposed at the first case wall, the electrode terminal having a terminal plate for connection with a bus bar, the terminal plate including a main body portion and at least one extension portion connected with the main body portion, the at least one extension portion being convexly disposed at the main body portion in a wall thickness direction perpendicular to the first case wall. The extension portion protrudes from the main body portion along the wall thickness direction perpendicular to the first housing wall, so that the contact area between the terminal plate and air can be increased, the contact area between the electrode terminal and air can be increased, the heat dissipation area can be increased, the heat dissipation performance of the electrode terminal can be improved, and the service performance of the battery cell can be further improved. In some embodiments, the extension portion is disposed to protrude from the main body portion along a length direction of the first housing wall, and a length of the extension portion is greater than a length of the main body portion. Therefore, the length of the extension part along the length direction of the first shell wall can be increased, the Zhou Xiangzhou length of the terminal plate is increased, the contact area between the terminal plate and air is increased, the heat dissipation area is increased, the heat dissipation capacity of the electrode terminal is improved, and the service performance of the battery cell is further improved. In some embodiments, the battery cell includes at least two electrode terminals including a first electrode terminal including a first body portion and a first extension portion, and a second electrode terminal including a second body portion and a second extension portion, the first extension portion and the second extension portion protruding toward one side close to each other along a length direction of the first case wall, or the first extension portion and the second extension portion protruding toward one side away from each other along the length direction of the first case wall, or the first extension portion and the second extension portion protruding toward the same side along the length direction of the first case wall. The electrode terminals are arranged in at least two ways, so that the contact area between the electrode terminals and air can be increased, the heat dissipation capacity of the electrode terminals is improved, and the service performance of the battery cell is further improved. The extending directions of the first extending part and the second extending part are various, so that the flexibility of the arrangement of the first extending part and the second extending part is improved. In some embodiments, the terminal plate includes a plurality of extensions. One terminal plate can be arranged to be at least two extension parts, so that the heat dissipation area of the terminal plate can be increased, the heat dissipation capacity of the electrode terminal is improved, and the service performance o