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CN-224232762-U - Battery monomer, battery device, energy storage device and electricity utilization device

CN224232762UCN 224232762 UCN224232762 UCN 224232762UCN-224232762-U

Abstract

The application discloses a battery unit, a battery device, an energy storage device and an electric device, wherein the battery unit comprises a shell and at least one electrode assembly arranged in a containing cavity of the shell, the shell comprises a shell and a body cover, the shell is provided with the containing cavity, one end of the shell in a first direction is provided with an opening, the opening is communicated with the containing cavity, an end cover seals the opening and is welded with the shell in a laser way, at least part of the end cover stretches into the shell through the opening and is in clearance fit with the shell, one of the outer peripheral surface of the part of the end cover stretching into the shell and the inner side surface of the shell is provided with a protruding structure, and the other one of the end cover is provided with a recessed structure matched with the protruding structure. The battery monomer, the battery device, the energy storage device and the power utilization device provided by the application have large capacitance.

Inventors

  • JIN KUN
  • PAN FENG
  • WEN YUQIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250320

Claims (20)

  1. 1. A battery cell is characterized by comprising a shell and at least one electrode assembly arranged in a containing cavity of the shell, The housing includes: A housing formed with the accommodation chamber, an opening formed at one end of the housing in a first direction, the opening communicating with the accommodation chamber; An end cap closing the opening and laser welding with the housing; wherein, at least part of end cover stretches into in the casing through the opening, and with casing clearance fit, the end cover stretches into in the casing the outer peripheral face of part and the medial surface of casing in the both, one be provided with protruding structure, the other be provided with protruding structure complex concave structure.
  2. 2. The battery cell of claim 1, wherein the raised structure is an annular structure extending along a circumferential direction of the end cap; The recessed structure is an annular structure extending along a circumferential direction of the end cap.
  3. 3. The battery cell according to claim 1 or 2, wherein the surface of the protruding structure comprises a convex arc-shaped face, the groove inner wall of the recessed structure comprises a concave arc-shaped face, and/or The surface of the raised structure comprises at least one first plane and the groove inner wall of the recessed structure comprises at least one second plane.
  4. 4. The battery cell according to any one of claims 1 to 3, wherein a surface of the end cap facing the electrode assembly includes a first inner surface, the end cap is formed with a first protrusion protruding toward the electrode assembly with respect to the first inner surface, a side of the first protrusion facing the inner side of the case is formed with the protrusion structure or the recess structure, and the first protrusion is clearance-fitted with the case.
  5. 5. The battery cell of claim 4, wherein a tab is disposed between the end cap and the electrode assembly, the tab abutting the first protrusion.
  6. 6. The battery cell as recited in claim 5, wherein the end cap is further formed with at least one second protrusion protruding toward the electrode assembly with respect to the first inner surface, the second protrusion being located at a side of the first protrusion facing a center of the end cap, each of the second protrusions abutting the rotation tab.
  7. 7. The battery cell as recited in claim 6, wherein the second protrusion is a ring-shaped structure centered at the center of the end cap or the second protrusion is a circular structure centered at the center of the end cap.
  8. 8. The battery cell according to any one of claims 6 or 7, wherein a position of the end cap opposite the electrode assembly corresponding to the first inner surface has a first outer surface, a position of the end cap opposite the electrode assembly corresponding to the first convex portion forms a first concave portion, and the first concave portion is recessed toward a side of the electrode assembly relative to the first outer surface.
  9. 9. The battery cell of claim 8, wherein a surface of the end cap facing away from the electrode assembly forms a second recess corresponding to the second protrusion, the second recess being recessed relative to the first surface toward a side facing the electrode assembly.
  10. 10. The battery cell of any one of claims 1 to 9, wherein a portion of the concave surface of the concave structure is blocked from a side of the convex structure facing away from the electrode assembly in the first direction.
  11. 11. The battery cell according to claim 10, wherein a portion of the inner side surface of the case located on a side of the protrusion structure facing away from the electrode assembly in the first direction is laser welded to a portion of the outer peripheral surface of the end cap located on a side of the protrusion structure facing away from the electrode assembly in the first direction.
  12. 12. The battery cell as recited in claim 10, wherein the end cap has a flange formed at an outer peripheral edge thereof, the flange being mounted on and laser-welded to an end surface of the case where the opening is provided.
  13. 13. The battery cell according to any one of claims 1 to 9, wherein the case is provided with the recessed structure, and an end of an inner concave surface of the recessed structure extends along the first direction and is connected to an end surface of the case where the opening is provided.
  14. 14. The battery cell of claim 13, wherein the portion of the concave surface of the concave structure extending in the first direction is laser welded to the convex structure.
  15. 15. The battery cell according to any one of claims 1 to 14, wherein a difference between a diameter of an inner side surface of the case and a diameter of an outer peripheral surface of the end cap is in a range of 0 to 0.2 mm.
  16. 16. The battery cell according to any one of claims 1 to 12, wherein the outer peripheral surface of the portion of the end cap protruding into the case is provided with the convex structure, the inner side of the case is provided with the concave structure, The outer diameter of the end cover at the protruding structure is smaller than the inner diameter of the shell at the recessed structure; the outer diameter of the end cover at the protruding structure is not smaller than the diameter of the inner side face of the shell.
  17. 17. The battery cell of claim 16, wherein a difference between an inner diameter of the housing at the recessed feature and an outer diameter of the end cap at the raised feature is in a range of 0-0.3 mm.
  18. 18. The battery cell of claim 16 or 17, wherein a difference between an outer diameter of the end cap at the raised structure and a diameter of an inner side of the case is in a range of 0-0.3 mm.
  19. 19. The battery cell according to any one of claims 1 to 15, wherein the outer peripheral surface of the portion of the end cap protruding into the case is provided with the concave structure, the inner side surface of the case is provided with the convex structure, The outer diameter of the end cover at the concave structure is smaller than the inner diameter of the shell at the convex structure; The diameter of the outer peripheral surface of the end cover is not smaller than the inner diameter of the shell at the protruding structure.
  20. 20. The battery cell of claim 19, wherein a difference between an inner diameter of the housing at the raised structure and an outer diameter of the end cap at the recessed structure is in a range of 0-0.3 mm.

Description

Battery monomer, battery device, energy storage device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device, 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. With the continuous development of battery technology, the industry is continually placing higher demands on the capacity of batteries. Disclosure of utility model In order to solve the technical problems, the application provides a battery cell, a battery device, an energy storage device and an electricity utilization device which can increase electric capacity. The application is realized by the following technical scheme. The first aspect of the application provides a battery cell comprising a housing and at least one electrode assembly arranged in a containing cavity of the housing, wherein the housing comprises a shell, the containing cavity is formed, an opening is formed at one end of the shell in a first direction, the opening is communicated with the containing cavity, an end cover is used for sealing the opening and is welded with the shell in a laser mode, at least part of the end cover stretches into the shell through the opening and is in clearance fit with the shell, one of the outer peripheral surface of the part of the end cover stretching into the shell and the inner side surface of the shell is provided with a protruding structure, and the other part of the end cover is provided with a concave structure matched with the protruding structure. According to the technical scheme provided by the application, the end cover is in clearance fit with the opening of the shell, so that the extrusion effect of the end cover on the periphery of the opening of the shell is reduced, the probability of expanding the opening of the shell to the periphery is reduced, the size consistency of the opening of the shell and the part far away from the opening is better, the number of battery monomers which can be accommodated in an accommodating space with a certain size is increased, and the capacitance is increased. In addition, the end cover and the shell are matched through the protruding structure and the recessed structure, so that a gap between the end cover and the shell does not linearly extend along the first direction, but is provided with a bent part at the matched position of the protruding structure and the recessed structure, and laser transmission is along the linear direction. In some embodiments, the raised structures are annular structures extending along the circumference of the end cap and the recessed structures are annular structures extending along the circumference of the end cap. The end cover is welded with the shell in an annular mode along the peripheral direction of the end cover, namely laser welding is needed at all positions of the peripheral edge of the end cover, therefore, the protruding structure and the recessed structure are all arranged to be annular structures, bending parts are arranged in annular gaps between the end cover and the shell, laser is not easy to enter the accommodating cavity at welding positions, and the electrode assembly and electrolyte are not easy to damage by the laser, so that the electric capacity of a battery cell is improved. In some embodiments, the surface of the raised structure comprises a convex arcuate surface, the groove inner wall of the recessed structure comprises a concave arcuate surface, and/or the surface of the raised structure comprises at least one first planar surface, and the groove inner wall of the recessed structure comprises at least one second planar surface. Through setting up protruding structure and concave structure into multiple different shapes, can realize blocking the function that laser got into the chamber that holds, moreover, do benefit to and improve packaging efficiency to and improve the firm nature of being connected between end cover and the casing two. In some embodiments, the surface of the end cap facing the electrode assembly includes a first inner surface, the end cap is formed with a first protrusion protruding toward the electrode assembly with respect to the first inner surface, a side of the first protrusion facing the inner side of the case is formed with a protrusion structure or a recess structure, and the first protrusion is clearance-fitted with the case. Thus, the first protruding portion is located near the outer peripheral edge of the end cover, and protrudes towa