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CN-122029695-A - Battery monomer, battery and power consumption device

CN122029695ACN 122029695 ACN122029695 ACN 122029695ACN-122029695-A

Abstract

A battery cell (20), a battery (100) and an electric device, wherein the battery cell (20) comprises a shell (1), an electrode terminal (2), an electrode assembly (3) and an insulating piece (4), the electrode terminal (2) is arranged on a wall portion (11) of the shell (1), the electrode assembly (3) is accommodated in the shell (1), a first tab (32) of the electrode assembly (3) is electrically connected to the electrode terminal (2), a first insulating portion (41) of the insulating piece (4) surrounds the outer side of the first tab (32), and a second insulating portion (42) is connected to the first insulating portion (41) and located between the wall portion (11) and the first tab (32). In the structure, the first insulation part (41) of the insulation part (4) surrounds the outer side of the first tab (32), the second insulation part (42) is positioned between the wall part (11) and the first tab (32), the insulation part (4) can insulate and isolate the first tab (32) from the shell (1), insulation processing procedures such as attaching insulation glue to the first tab (32) are reduced, and the production efficiency of the battery cell (20) is improved.

Inventors

  • MA RUOYAN
  • GUO ZHIJUN
  • WU GUANGJIN
  • XIE CHENGBIN
  • SHI SHENGYUN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20240529

Claims (20)

  1. A battery cell, comprising: A housing including a wall portion; An electrode terminal provided on the wall portion; An electrode assembly accommodated in the case, the electrode assembly including a first tab electrically connected to the electrode terminal; the insulating piece comprises a first insulating part and a second insulating part, wherein the first insulating part surrounds the outer side of the first tab, and the second insulating part is connected with the first insulating part and is positioned between the wall part and the first tab.
  2. The battery cell according to claim 1, wherein an end face of the first insulating portion facing away from the second insulating portion is provided with a notch penetrating through the first insulating portion in a thickness direction of the first insulating portion.
  3. The battery cell according to claim 2, wherein the first insulating portion is provided with a plurality of the notches, the plurality of notches being arranged along a circumferential direction of the first insulating portion.
  4. The battery cell according to claim 2 or 3, wherein the width of the notch in the circumferential direction of the first tab gradually increases in a direction directed toward the electrode assembly by the first insulating portion.
  5. The battery cell of any one of claims 2 to 4, further comprising a current collector connected to the first tab, the first insulating portion enclosing a receiving cavity, the current collector being located in the receiving cavity, at least a portion of the current collector being located between the second insulating portion and the first tab; And a through hole communicated with the accommodating cavity is formed in the second insulating part, and the current collector is connected with the electrode terminal through the through hole.
  6. The battery cell according to claim 5, wherein the first insulating portion has a dimension H1, the current collector has a thickness H3, and the notch has a dimension H4, H4. Ltoreq.h1-H3 in a thickness direction of the wall portion.
  7. The battery cell according to any one of claims 5 to 6, wherein the electrode assembly further comprises a pole piece and a separator which are stacked, the first tab is connected to the pole piece and extends out of the separator, the first insulating portion has a dimension H1 in a thickness direction of the wall portion, the first tab extends out of the separator to have a dimension H2, and the current collector has a thickness H3, wherein H1 is equal to or greater than H2 +H2.
  8. The battery cell according to claim 7, wherein the first tab is a cylindrical body, the length of the first tab in the winding direction is L1, and the length of the pole piece in the winding direction is L2, wherein L1/L2 is not less than 50%.
  9. The battery cell of any one of claims 1 to 8, further comprising a current collector connected to the first tab, the first insulating portion enclosing a receiving cavity, the current collector being located in the receiving cavity, at least a portion of the current collector being located between the second insulating portion and the first tab; the second insulating part is provided with a through hole communicated with the accommodating cavity, and the current collector is connected with the electrode terminal through the through hole; The battery cell further includes an insulating structure disposed at a surface of the wall portion facing the electrode assembly, at least a portion of the insulating structure being located between the wall portion and the second insulating portion.
  10. The battery cell according to claim 9, wherein at least part of the insulating structure protrudes from an inner wall surface of the through hole in a direction directed from the first insulating portion to the first tab to insulate the current collector from the wall portion.
  11. The battery cell as recited in claim 10, wherein at least a portion of the insulating structure protruding from the inner wall surface of the through-hole abuts the current collector to press the first tab.
  12. The battery cell of any one of claims 9 to 11, wherein at least a portion of the insulating structure is sandwiched between the wall portion and the second insulating portion.
  13. The battery cell according to any one of claims 9 to 12, wherein a region of overlap of a projection of the insulating structure and a projection of the second insulating portion in a thickness direction of the wall portion is annular, and a width of the region of overlap in a radial direction of the first tab is D, D being equal to or greater than 0.8mm.
  14. The battery cell according to any one of claims 1 to 13, wherein a wall thickness of the second insulating portion is T1,0.05mm ∈t1 ∈4mm in a thickness direction of the wall portion.
  15. The battery cell of any one of claims 1 to 14, wherein the first insulating portion encloses a receiving cavity in which at least a portion of the first tab is received; At least part of the accommodating cavity is reduced in size in the radial direction of the first tab in a direction directed from the first tab to the first insulating portion.
  16. The battery cell of any one of claims 1 to 15, wherein a thickness of an end region of the first insulating portion distal from the second insulating portion is less than a thickness of an end region of the first insulating portion proximal to the second insulating portion.
  17. The battery cell of claim 16, wherein at least a portion of the first insulating portion has a thickness that gradually increases in a direction from the first tab toward the first insulating portion.
  18. The battery cell of any one of claims 1 to 17, wherein the electrode assembly further comprises a second tab of opposite polarity to the first tab, the second tab being electrically connected to the housing.
  19. The battery cell of any one of claims 1 to 18, wherein the housing comprises a shell and an end cap, the shell comprising an end wall and a side wall, the side wall surrounding the end wall, one end of the side wall being connected to the end wall and the other end forming an opening opposite the end wall, the end cap covering the opening, the wall being either the end wall or the end cap.
  20. A battery comprising a cell according to any one of claims 1 to 19.

Description

Battery compartment of power conversion system and power conversion system Technical Field The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery and an electric device. Background The battery has the advantages of high specific energy, high power density and the like, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric tools and the like. With the increasing range of applications of batteries, how to improve the production efficiency of batteries has been a focus of attention of those skilled in the art. Disclosure of Invention In view of the above, the present application provides a battery cell, a battery and an electric device, wherein the battery cell has high production efficiency. In a first aspect, some embodiments of the present application provide a battery cell including a case including a wall portion, an electrode terminal disposed in the wall portion, an electrode assembly received in the case, the electrode assembly including a first tab electrically connected to the electrode terminal, and an insulating member including a first insulating portion surrounding the first tab and a second insulating portion connected to the first insulating portion and located between the wall portion and the first tab. In the structure, the first insulation part of the insulation part surrounds the outer side of the first tab, the second insulation part is positioned between the wall part and the first tab, the insulation part can insulate and isolate the first tab from the shell, insulation treatment procedures such as insulating glue pasting on the first tab are reduced, and the production efficiency of the battery cell is improved. According to the battery cell provided by some embodiments of the application, the end face of the first insulating part, which is away from the second insulating part, is provided with the notch, and the notch penetrates through the first insulating part along the thickness direction of the first insulating part, so that the first insulating part can be opened at the notch in the process of extending into the space surrounded by the first insulating part, the opening of the first insulating part, which is away from the second insulating part, can be increased, and the first tab can be easily plugged into the space surrounded by the first insulating part, thereby being beneficial to improving the convenience of the battery cell assembly. According to the battery cell provided by some embodiments of the application, the first insulating part is provided with the plurality of notches, and the plurality of notches are arranged along the circumferential direction of the first insulating part, so that the opening of the first insulating part, which is away from the second insulating part, can be uniformly increased, and the smoothness of the first tab in the plugging process is improved. According to the battery cell provided by some embodiments of the application, the width of the notch in the circumferential direction of the first tab is gradually increased along the direction from the first insulating part to the electrode assembly, so that the opening of the second insulating part is facilitated. According to the battery cell provided by the embodiments of the application, the battery cell further comprises a current collecting piece connected to the first tab, the first insulating part is enclosed to form a containing cavity, the current collecting piece is positioned in the containing cavity, at least part of the current collecting piece is positioned between the second insulating part and the first tab, a through hole communicated with the containing cavity is formed in the second insulating part, and the current collecting piece is connected with the electrode terminal through the through hole. According to the battery cell provided by some embodiments of the application, along the thickness direction of the wall, the size of the first insulating part is H1, the thickness of the current collector is H3, the size of the notch is H4, H4 is less than or equal to H1-H3, so that the current collector can be completely surrounded by the first insulating part in the circumferential direction of the current collector, and the current collector is not easy to leak electricity to the shell by taking the notch as a channel, thereby being beneficial to improving the reliability of the battery cell. According to the battery cell provided by the embodiments of the application, the electrode assembly further comprises a pole piece and a separator which are arranged in a stacked manner, the first electrode lug is connected with the pole piece and extends out of the separator, the first insulating part is H1 in size, the first electrode lug extends out of the separator in size H2 in the thickness direction