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CN-121986415-A - Battery monomer, battery, energy storage device and electricity utilization device

CN121986415ACN 121986415 ACN121986415 ACN 121986415ACN-121986415-A

Abstract

The disclosure discloses a battery cell, a battery, an energy storage device and an electricity utilization device. Each electrode lead-out member of the battery cell includes a first portion, an intermediate portion, and a second portion, the second portion of the first electrode lead-out member is connected to the first tab, the second portion of the second electrode lead-out member is connected to the second tab, a ratio of a center axis of the first portion of the first electrode lead-out member to a center axis of the first portion of the second electrode lead-out member in a first direction to a size of the first case wall is not more than 60%, the second portion of each electrode lead-out member includes a body portion overlapping the first portion in a wall thickness direction of the first case wall and an extension portion beyond the first portion in the first direction, the extension portion of the first electrode lead-out member is located on a side of the body portion of the first electrode lead-out member facing the second electrode lead-out member, and the extension portion of the second electrode lead-out member is located on a side of the body portion of the second electrode lead-out member facing away from the first electrode lead-out member. The present disclosure has a high volumetric energy density and high structural strength.

Inventors

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

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20240627

Claims (20)

  1. A battery cell comprising: a housing having a first housing wall and a receiving cavity; The electrode assembly is arranged in the accommodating cavity and is provided with at least two lugs, and the at least two lugs comprise a first lug and a second lug; at least two electrode lead-out pieces including a first electrode lead-out piece and a second electrode lead-out piece both provided on the first housing wall and arranged along a first direction, Wherein each of the electrode lead-out members includes a first portion located outside the housing, a second portion located inside the housing, and an intermediate portion connected between the first portion and the second portion, the second portion of the first electrode lead-out member is connected to the first tab, the second portion of the second electrode lead-out member is connected to the second tab, In the first direction, a ratio of a pitch of the central axis of the first portion of the first electrode lead and the central axis of the first portion of the second electrode lead to a size of the first housing wall is not more than 60%, The second portion of each of the electrode leads includes a body portion overlapping the first portion in a wall thickness direction of the first housing wall and an extension portion beyond the first portion in the first direction, the extension portion of the first electrode lead being located on a side of the body portion of the first electrode lead facing the second electrode lead, the extension portion of the second electrode lead being located on a side of the body portion of the second electrode lead facing away from the first electrode lead.
  2. The battery cell according to claim 1, wherein each of the electrode lead-out members includes an electrode terminal passing through a terminal mounting hole of the first case wall, a portion of the electrode terminal located outside the case being the first portion, a portion located inside the terminal mounting hole being the intermediate portion, and a transfer piece connected to one end of the electrode terminal located inside the housing, the portion of the electrode terminal located inside the case and the transfer piece forming the second portion.
  3. The battery cell of claim 1, wherein the second portion is an integrally formed structure.
  4. The battery cell according to any one of claims 1 to 3, wherein one of the first tab and the second tab is a positive electrode tab, and the other is a negative electrode tab.
  5. The battery cell of any one of claims 1-3, wherein the first tab and the second tab are both positive tabs or the first tab and the second tab are both negative tabs.
  6. The battery cell of claim 5, wherein the first tab and the second tab are integrally formed.
  7. The battery cell of claim 4 or 5, wherein the first tab and the second tab are spaced apart.
  8. The battery cell of claim 7, wherein the minimum spacing of the second portion of the first electrode lead and the second portion of the second electrode lead in the first direction is not less than 5mm.
  9. The battery cell according to any one of claims 1 to 8, wherein a pitch of a center axis of the first portion of the first electrode lead and a center axis of the first portion of the second electrode lead is not more than 100mm along the first direction.
  10. The battery cell according to any one of claims 1 to 9, wherein a minimum pitch of the first portion of the first electrode lead and the first portion of the second electrode lead is not less than 2mm along the first direction.
  11. The battery cell according to claim 2, wherein an end face of the electrode terminal of each of the electrode lead-out members, which is away from the accommodation chamber, is a first end face, an end face, which is close to the accommodation chamber, is a second end face, The area of the second end face is smaller than that of the first end face.
  12. The battery cell of claim 11, wherein a ratio of a dimension of the second end face to a dimension of the first end face in the first direction is in a range of 20% -150%.
  13. The battery cell of claim 11, wherein a ratio of a dimension of the second end face to a dimension of the first end face in the first direction is in a range of 25% -100%.
  14. The battery cell according to any one of claims 11 to 13, wherein, in the first direction, the first end face has a size in the range of 20mm to 50mm and/or the second end face has a size in the range of 10mm to 30mm.
  15. The battery cell according to any one of claims 11 to 13, wherein, in the first direction, the first end face has a size in the range of 25mm to 40mm and/or the second end face has a size in the range of 10mm to 25 mm.
  16. The battery cell of claim 6, wherein a dimension of a surface of the tab facing the first housing wall along the first direction is in a range of 25mm to 65 mm.
  17. The battery cell of claim 6, wherein a dimension of a surface of the tab facing the first housing wall along the first direction is in a range of 30mm to 50 mm.
  18. The battery cell of any one of claims 1 to 17, wherein, along the first direction, a midpoint between a central axis of the first portion of the first electrode lead and a central axis of the first portion of the second electrode lead is disposed offset from a center of the first housing wall.
  19. The battery cell of claim 18, wherein, along the first direction, a ratio of a midpoint between a center axis of the first portion of the first electrode lead and a center axis of the first portion of the second electrode lead to a center of the first housing wall to a dimension of the first housing wall is no greater than 47.5%.
  20. The battery cell of claim 18, wherein, along the first direction, a ratio of a midpoint between a center axis of the first portion of the first electrode lead and a center axis of the first portion of the second electrode lead and a spacing of a center of the first housing wall to a size of the first housing wall is in a range of 40% -47.5%.

Description

Battery monomer, battery, energy storage device and electricity utilization device Technical Field The disclosure relates to the technical field of batteries, in particular to a battery monomer, a battery, an energy storage device and an electric device. Background New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side. The structural strength of a battery is related to the service life of the battery, and therefore, how to improve the structural strength of the battery is one of the subjects of research required in the industry to extend the service life of the battery. In addition, the industry is continually placing higher demands on the volumetric energy density of the battery. Disclosure of Invention In view of the foregoing, it is desirable to provide a battery cell, a battery, an energy storage device, and an electrical device having a high volumetric energy density and a high structural strength. In order to achieve the above purpose, the present disclosure adopts the following technical solutions. The first aspect of the disclosure provides a battery cell, which comprises a shell, an electrode assembly and at least two electrode lead-out pieces, wherein the shell is provided with a first shell wall and a containing cavity, the electrode assembly is arranged in the containing cavity and is provided with at least two electrode lugs, the at least two electrode lugs comprise a first electrode lead-out piece and a second electrode lead-out piece, the first electrode lead-out piece and the second electrode lead-out piece are respectively arranged on the first shell wall along a first direction, each electrode lead-out piece comprises a first part positioned on the outer side of the shell, a second part positioned on the inner side of the shell and a middle part connected between the first part and the second part, the second part of the first electrode lead-out piece is connected with the first electrode lugs, the second part of the second electrode lead-out piece is connected with the second electrode lugs, the ratio of the central axis of the first part of the first electrode lead-out piece to the central axis of the second electrode lead-out piece to the first electrode lead-out piece in the first direction is larger than the first part of the first electrode lead-out piece, and the first electrode lead-out piece is positioned on the first electrode lead-out piece extends to the first side of the first shell wall, and the first electrode lead-out piece is positioned on the side of the first electrode body is far from the first side of the first electrode lead-out piece is more than the first electrode lead-out piece is. In the technical solution of the embodiment of the present disclosure, since the extending portion of the second portion of the first electrode lead and the extending portion of the second electrode lead extend from the body portion connected to each other to the same side, that is, the second portion of the first electrode lead and the second portion of the second electrode lead are arranged in a forward direction, the space between the first portion of the first electrode lead and the first portion of the second electrode lead is advantageously reduced, and the present disclosure further defines a range of a ratio of the central axis of the first portion of the first electrode lead and the central axis of the first portion of the second electrode lead to the size of the first housing wall, so that the arrangement of the first electrode lead and the second electrode lead is concentrated, which is advantageous for improving the structural strength of the first housing wall, and the arrangement of other parts is advantageously increased, which is advantageous for improving the volumetric energy density of the battery cell. In some embodiments, each of the electrode lead-out members includes an electrode terminal passing through a terminal mounting hole of the first housing wall, and a transfer piece connected to one end of the electrode terminal located in the receiving cavity, a portion of the electrode terminal located outside the housing is the first portion, a portion located inside the terminal mounting hole is the intermediate portion, and a portion of the electrode terminal located inside the housing and the transfer piece form the second portion. Thus, the electrode terminal and the transfer sheet are connected to form an electrode lead-out member for leading in or leading out a current. Moreover, the arrangement of the first electrode lead-out piece and the second electrode lea