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CN-122003780-A - Battery monomer, battery, power utilization device and energy storage device

CN122003780ACN 122003780 ACN122003780 ACN 122003780ACN-122003780-A

Abstract

A battery cell (10), a battery (100), an electrical device and an energy storage device (2000). The battery cell (10) comprises a case (1) having an accommodation space, the case (1) comprising a first case wall (11), an electrode assembly provided in the accommodation space, and a first electrode terminal (31) provided in the first case wall (11), the first electrode terminal (31) comprising a first connection portion (61) connected to a first bus bar, a second electrode terminal (32) provided in the first case wall (11), the second electrode terminal (32) comprising a second connection portion (62) connected to a second bus bar, the first connection portion (61) and the second connection portion (62) being arranged in the width direction of the first case wall (11), and the projections of the first connection portion (61) and the second connection portion (62) in the width direction of the first case wall (11) at least partially overlapping.

Inventors

  • CHEN WEI
  • ZHOU WENLIN
  • Meng Wanqiu
  • Nie Xianzhen
  • ZHENG YULIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
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 provided in the receiving space, and A first electrode terminal provided at the first case wall, the first electrode terminal including a first connection part for connection with a first bus bar; A second electrode terminal provided at the first case wall, the second electrode terminal including a second connection part for connection with a second bus bar; The first connecting portions and the second connecting portions are arranged in the width direction of the first housing wall, and projections of the first connecting portions and the second connecting portions in the width direction of the first housing wall at least partially overlap.
  2. The battery cell according to claim 1, wherein, The first electrode terminal further includes a first body portion connected to the first connection portion, the second electrode terminal further includes a second body portion connected to the second connection portion, Along the length direction of the first housing wall, at least part of the first connecting portion and at least part of the second connecting portion are located between the first body portion and the second body portion.
  3. The battery cell according to claim 2, wherein, The length of the first main body part along the width direction of the first housing wall is larger than or equal to the first connecting part, and/or, The length of the second main body part along the width direction of the first housing wall is larger than or equal to the second connecting part.
  4. The battery cell according to claim 3, wherein, The first connecting portion is disposed offset with respect to a center position of the first main body portion in a width direction of the first housing wall, and/or, The second connecting portion is disposed offset with respect to a center position of the second main body portion in a width direction of the first housing wall.
  5. The battery cell according to claim 2, wherein, The first main body part and the second connecting part are overlapped along the projection part of the length direction of the first shell wall, and/or the second main body part and the projection part of the first connecting part along the length direction of the first shell wall are overlapped.
  6. The battery cell according to claim 5, wherein, A gap is formed between the first connecting part and the first main body part, and the second connecting part is at least partially positioned in the gap.
  7. The battery cell according to any one of claims 1 to 6, wherein, The length of the first shell wall along the length direction of the first shell wall is L, the length of the first connecting part along the length direction of the first shell wall is A1, the length of the second connecting part along the length direction of the first shell wall is A2, and the length of the second connecting part along the length direction of the first shell wall is more than or equal to 10% and less than or equal to 40%, and/or more than or equal to 10% and less than or equal to 40%.
  8. The battery cell according to any one of claims 1 to 7, wherein, The first connecting portion and the second connecting portion have a first overlapping portion in a width direction of the first housing wall, The length of the first overlapping portion in the length direction of the first housing wall is in a range of 3mm to 50mm.
  9. The battery cell according to any one of claims 2 to 6, wherein, The first and second body portions are located between the first and second connection portions along a width direction of the first housing wall.
  10. The battery cell according to claim 9, wherein, Along the length direction of the first housing wall, the first body portion and the second body portion have a second overlapping portion, The length of the first housing wall in the width direction of the first housing wall is W, and the length of the second overlapping portion in the width direction of the first housing wall is B, then B is in the range of 20% to 90% of W.
  11. The battery cell according to claim 9 or 10, wherein, The length of the first main body part along the width direction of the first shell wall is B1, the length of the second main body part along the width direction of the first shell wall is B2, and the absolute value of the difference value between B1 and B2 is larger than or equal to 0mm.
  12. The battery cell of claim 11, wherein, The absolute value of the difference between B1 and B2 is in the range of 0mm to 50 mm.
  13. The battery cell according to any one of claims 1 to 12, wherein, Along a length direction of the first case wall and a width direction of the first case wall, a closest distance between the first electrode terminal and the second electrode terminal is greater than or equal to 0.3mm.
  14. The battery cell of claim 13, wherein, Along a length direction of the first case wall and a width direction of the first case wall, a closest distance between the first electrode terminal and the second electrode terminal is 2.0mm or more.
  15. The battery cell according to any one of claims 2 to 6, 9 to 12, wherein, The first electrode terminal and the second electrode terminal each include a connection region for connection with a bus bar for electrically connecting a plurality of the battery cells to each other.
  16. The battery cell of claim 15, wherein, The first connecting portion and the second connecting portion have a first overlapping portion in a width direction of the first housing wall, The connection region is formed at least in the first overlapping portion.
  17. The battery cell of claim 16, wherein, The connection region is also formed in at least either one of the first body portion and the second body portion.
  18. The battery cell according to claim 16 or 17, wherein, The area of the connection region formed at the first overlapping portion is SA, and the area S of the entire connection region is SA, so that SA occupies 50% to 100% of S.
  19. The battery cell according to any one of claims 15 to 18, wherein, The connection region formed at the first connection portion has a center line position in the width direction of the first housing wall offset from a center line position of the first housing wall in the width direction of the first housing wall by a distance B3, and B3 is in a range of 15% to 27% of W.
  20. The battery cell according to any one of claims 2 to 6, 9 to 12, 15 to 19, wherein, The battery cell also comprises a first insulating piece, wherein 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.

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. With the increasing demands in the industry for volume utilization, weight reduction, and the like of batteries, the housings of the battery cells tend to be large and thin, and in this case, the housings of the battery cells tend to have insufficient strength and to be easily deformed by bending. In addition, there is a case where the electrode terminals provided in the case are more prone to this problem. Therefore, how to improve the strength of the case wall provided with the electrode terminals in the case of the battery cell is one of the directions of research 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 bending strength of a case wall in which an electrode terminal is provided in a case of the battery cell. In order to achieve the above purpose, the present disclosure adopts the following technical solutions. A 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 provided in the accommodation space, and a first electrode terminal provided in the first case wall, the first electrode terminal including a first connection part for connection with a first bus bar, a second electrode terminal provided in the first case wall, the second electrode terminal including a second connection part for connection with a second bus bar, the first connection part and the second connection part being arranged in a width direction of the first case wall, and projections of the first connection part and the second connection part in the width direction of the first case wall at least partially overlapping. In the battery cell according to the embodiment of the disclosure, since the first connection portion and the second connection portion are arranged along the width direction of the first housing wall and overlap along the projection of the width direction of the first housing wall, the first electrode terminal and the second electrode terminal are arranged in a compact position, so that the first electrode terminal and the second electrode terminal are facilitated to cooperate with each other to form the structural reinforcement member with a larger area, thereby improving the structural strength, particularly the bending strength, of the first housing wall. Because the first connecting part and the second connecting part are respectively used for being connected with the confluence piece, after a plurality of battery cells are arranged along the width direction of the first shell wall, the positions of the first connecting part and the second connecting part of the adjacent battery cells are opposite, and the shortening of the connecting path of the confluence piece is facilitated. In some embodiments, the first electrode terminal further includes a first body portion connected to the first connection portion, the second electrode terminal further includes a second body portion connected to the second connection portion, and at least a portion of the first connection portion and at least a portion of the second connection portion are located between the first body portion and the second body portion along a length direction of the first case wall. Because the first connecting portion is connected with the first main body portion, and the second connecting portion is connected with the second main body portion, the stress area is further increased through the first main body portion and the second main body portion, and the bending strength of the first shell wall is improved. Since the first connection part and the second connection part are located between the first body part and the second body part in the length direction of the first case wall and have overlapping parts in the width direction of the first case wall, the bending strength of the region of the first case wall where the electrode terminals are disposed can be improved by the synergistic effect of the two electrode terminals. Furthermore, the first electrode terminal and the second electrode terminal can be arranged as compactly as possible, which is beneficial to the utilization of the non-electrode terminal arrangement area of the first casing wall, and is beneficial to the volume utilization rate of the b