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CN-122003759-A - Battery monomer, battery, power utilization device and energy storage device

CN122003759ACN 122003759 ACN122003759 ACN 122003759ACN-122003759-A

Abstract

The disclosure provides a battery cell, a battery, an electricity utilization device and an energy storage device. The battery cell provided by the disclosure comprises a shell, an electrode assembly and an end cover, wherein the shell is provided with an accommodating space, the shell is provided with an opening facing a first direction, the shell is provided with an end face and an inner peripheral face, the end face is arranged on one side of the shell facing the first direction and surrounds the opening, the inner peripheral face is connected with the end face, the electrode assembly is arranged in the accommodating space, the end cover covers the opening and comprises a first section and a second section which are connected with each other, the surface of the first section facing the electrode assembly is abutted against the end face, and the surface of one side of the second section perpendicular to the first direction is abutted against the inner peripheral face.

Inventors

  • ZHOU WENLIN
  • CAO MENGKAI
  • HUANG JIAN
  • ZHENG YULIAN
  • WANG PENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240702

Claims (18)

  1. A battery cell, comprising: A housing having an accommodation space, the housing being configured with an opening facing a first direction, the housing having an end surface provided on a side of the housing facing the first direction and surrounding the opening, and an inner peripheral surface connected to the end surface; an electrode assembly disposed in the receiving space; an end cap closing the opening, the end cap comprising a first section and a second section connected to each other; Wherein a surface of the first segment facing the electrode assembly abuts against the end face, and a surface of the second segment perpendicular to the first direction abuts against the inner peripheral surface.
  2. The battery cell according to claim 1, wherein, The end cover is provided with a notch, the first section and the second section are arranged along a second direction, the second section is smaller than the first section along a third direction so as to form the notch, and the first direction, the second direction and the third direction are perpendicular to each other; The shell comprises an extending part, the extending part is arranged on the end face, the extending part and the second section are oppositely arranged along the third direction and at least partially accommodated in the notch, and the surface of one side of the second section in the third direction is abutted to the inner wall surface of the extending part.
  3. The battery cell according to claim 2, wherein, The projection abuts a surface of the first segment facing the second direction.
  4. The battery cell according to any one of claim 1 to 3, wherein, The first sections are multiple, and the second sections are arranged between two adjacent first sections.
  5. The battery cell according to claim 4, wherein, Two adjacent first segments have a height difference along the first direction, The case has a bulge portion bulging toward the end cap, the bulge portion being connected with at least the first section farther from the electrode assembly in the first direction.
  6. The battery cell according to claim 5, wherein, The bulge is connected with the second section, and the extension part is at least partially arranged on the bulge.
  7. The battery cell according to claim 5 or 6, wherein, The second section comprises a transition section and two connecting sections parallel to the second direction, and the connecting sections are positioned on two sides of the transition section in the second direction and are respectively connected with the first section.
  8. The battery cell according to any one of claims 5 to 7, wherein, The number of the second sections is a plurality, Two sides of the first section farther from the electrode assembly in the second direction are respectively connected with the second section, Or alternatively The first section, which is farther from the electrode assembly, is connected to the second section at one side thereof in the second direction.
  9. The battery cell according to any one of claims 2 to 8, wherein, The end cover is provided with a plurality of notches which are respectively positioned at two sides of the second section along the third direction, the shell is provided with a plurality of protruding parts, The protruding portion is at least partially accommodated in each of the notches.
  10. The battery cell according to any one of claims 5 to 8, wherein, A receiving space is provided at a side of the first section farther from the electrode assembly toward the receiving space, the receiving space communicates with the receiving space, The electrode assembly includes a first tab and a second tab, the first tab and the second tab being partially received in the receiving space, The battery cell further includes a first electrode terminal electrically connected with the first tab and a second electrode terminal electrically connected with the second tab, the first electrode terminal and the second electrode terminal being disposed apart from each other at the first section farther from the electrode assembly.
  11. The battery cell according to claim 10, wherein, The first section farther from the electrode assembly is provided with two, and the first electrode terminal and the second electrode terminal are respectively provided at the two first sections farther from the electrode assembly.
  12. The battery cell according to any one of claims 1 to 11, wherein, The surface of the end cover, which is close to the accommodating space, is provided with a limiting part protruding towards the accommodating space, and the limiting part is abutted with the inner peripheral surface.
  13. The battery cell according to any one of claims 1 to 12, wherein, The shell is welded with the end cover.
  14. The battery cell according to any one of claims 1 to 13, wherein, The battery cell also comprises an insulating part, wherein the insulating part is positioned between the end cover and the electrode assembly and is connected with the end cover, and the projection of the insulating part does not exceed the projection of the end cover along the first direction in the same projection plane.
  15. A battery comprising a case and at least two of the battery cells of any one of claims 1 to 14, the battery cells comprising a first electrode terminal and a second electrode terminal electrically connected to the electrode assembly, respectively.
  16. The battery of claim 15, wherein the battery comprises a battery cell, At least one wall of the case has a boss formed by the boss protruding toward a direction away from the battery cell, the boss forming a receiving part at a side toward the battery cell, The projection of the first electrode terminal and the second electrode terminal does not exceed the projection of the boss in a direction perpendicular to the wall of the case where the boss is formed, and the first electrode terminal and the second electrode terminal are at least partially accommodated in the accommodating portion.
  17. An electrical device, wherein the electrical device comprises a plurality of the battery cells of any one of claims 1 to 14, or the battery of claim 15 or 16, the battery cells or the battery powering the electrical device.
  18. An energy storage device, wherein the energy storage device comprises a plurality of cells according to any one of claims 1 to 14, or a battery according to claim 15 or 16, for storing electrical energy and capable of providing electrical energy.

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. The battery includes a plurality of battery cells electrically connected to each other. The battery cell generally includes an electrode assembly, a case, and an end cap connected to an opening of the case and enclosing the electrode assembly within the case. However, when the end cover and the shell are connected, the positions of the end cover and the shell are easy to deviate relatively, poor connection can be caused, and connection reliability is reduced. Therefore, how to improve the connection reliability of the end cap and the housing is one of the directions of research in the industry. Disclosure of Invention In view of the foregoing, it is desirable to provide a battery cell, a battery, an electric device, and an energy storage device that can reduce the offset when an end cap and a case are connected, and thereby improve the connection reliability. In order to achieve the above object, 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 being configured with an opening facing a first direction, the case having an end surface and an inner circumferential surface, the end surface being disposed at a side of the case facing the first direction and disposed around the opening, the inner circumferential surface and the end surface being connected, an electrode assembly disposed in the accommodation space, an end cap covering the opening, the end cap including a first section and a second section connected to each other, wherein a surface of the first section facing the electrode assembly is abutted against the end surface, and a surface of a side of the second section perpendicular to the first direction is abutted against the inner circumferential surface. The surface of the first section of the end cover facing the electrode assembly is abutted against the end surface, and the surface of the second section of the end cover, which is perpendicular to the first direction, is abutted against the surface, so that the end cover can be limited by the end surface of the shell in the first direction, and the end cover can be limited by the inner peripheral surface of the shell in the direction perpendicular to the first direction, so that the position of the end cover relative to the shell is fixed, the relative displacement between the end cover and the shell can be reduced when the end cover and the shell are connected, the risk of poor connection caused by offset is reduced, the connection gap between the end cover and the shell is reduced, and the connection strength is enhanced. Since the electrode assembly is disposed in the receiving space, the case and the end cap cooperate to isolate the electrode assembly from the outside, so that the electrode assembly can be protected. In some embodiments, the end cap has a notch, the first section and the second section are arranged along a second direction, the second section has a smaller size than the first section along a third direction to form the notch, the first direction, the second direction and the third direction are perpendicular to each other, the housing includes a protruding portion provided on the end face, the protruding portion and the second section are disposed opposite to each other along the third direction and at least partially accommodated in the notch, and a surface of one side of the second section abuts against an inner wall surface of the protruding portion. Because the extension is held in the breach, consequently, at the in-process that the extension stretched into the breach, the breach can guide the extension to stretch into, helps making casing and end cover mutual alignment, after the extension stretches into the breach, the inner wall of extension can carry out spacingly to the surface of one side of the third direction of breach, makes the relative position of end cover and casing fixed. In some embodiments, the protrusion abuts a surface of the first segment facing the second direction. In the second direction, the first section of the end cover is limited by the extending part, so that the relative positions of the end cover and the extending part are further fixed, the relative displacement between the end cover and the shell can be reduced when the end cover and the shell are connected, the risk of