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CN-224232667-U - Battery cell, battery device and electricity utilization device

CN224232667UCN 224232667 UCN224232667 UCN 224232667UCN-224232667-U

Abstract

The embodiment of the disclosure provides a battery monomer, a battery device and an electricity utilization device, and belongs to the technical field of batteries. The first wall of the shell is provided with a first through hole penetrating through, the electrode assembly is accommodated in the shell, the first terminal part is located on one side, away from the electrode assembly, of the first wall, the second terminal part is located on one side, close to the electrode assembly, of the first wall, the second terminal part is electrically connected with the electrode assembly, at least part of the third terminal parts connected with the first terminal part and the second terminal part are located in the first through hole, and a gap is formed between an insulating piece located between the first terminal part and the first wall and the first terminal part. The clearance can alleviate the vibration extrusion of insulator to first terminal portion, and the clearance can provide the space of predeformation for first terminal portion to offset the heat altered shape of first terminal portion, reduce the surface of one side that first terminal portion deviates from the electrode assembly and warp, make the surface of one side that first terminal portion deviates from the electrode assembly have better planarization.

Inventors

  • CHEN SHENGWANG
  • ZHOU WENLIN
  • Ye Gangping
  • GUO ZHIJUN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250416

Claims (20)

  1. 1. A battery cell, comprising: a housing including a first wall having a first through-hole therein; An electrode assembly accommodated in the case; An electrode terminal assembly including a first terminal portion, a second terminal portion and a third terminal portion, the first terminal portion being located on a side of the first wall facing away from the electrode assembly, the second terminal portion being located on a side of the first wall facing toward the electrode assembly, the second terminal portion being electrically connected with the electrode assembly, the third terminal portion being located at least partially within the first through-hole, the third terminal portion being connected with the first terminal portion and the second terminal portion, respectively, the first wall being partially mounted between the first terminal portion and the second terminal portion; An insulator is at least partially disposed between the first terminal portion and the first wall, the insulator and the first terminal portion forming a gap therebetween.
  2. 2. The battery cell according to claim 1, wherein the gap has a first portion closer to the first through hole and a second portion farther from the first through hole, an arrangement direction of the first portion and the second portion is arranged to intersect a thickness direction of the first wall, and a height of the first portion is smaller than a height of the second portion in the thickness direction of the first wall.
  3. 3. The battery cell of claim 2, wherein a height of the gap in a thickness direction of the first wall increases gradually in a direction in which a first portion of the gap is directed toward a second portion of the gap.
  4. 4. The battery cell according to claim 3, wherein a side of the insulating member facing the gap has a first surface, a side of the first terminal portion facing the gap has a second surface, and an end of the first surface remote from the first through-hole is inclined toward the electrode assembly in a thickness direction of the first wall, the second surface being perpendicular to the thickness direction of the first wall.
  5. 5. The battery cell according to claim 3, wherein a side of the insulating member facing the gap has a first surface, a side of the first terminal portion facing the gap has a second surface, an end of the first surface remote from the first through-hole is inclined toward the electrode assembly in a thickness direction of the first wall, and an end of the second surface remote from the first through-hole is inclined toward the electrode assembly in the thickness direction of the first wall.
  6. 6. The battery cell according to claim 3, wherein a side of the insulating member facing the gap has a first surface, a side of the first terminal portion facing the gap has a second surface, an end of the first surface remote from the first through-hole is inclined toward the electrode assembly in a thickness direction of the first wall, and an end of the second surface remote from the first through-hole is inclined away from the electrode assembly in the thickness direction of the first wall.
  7. 7. The battery cell of claim 4, wherein the first surface is planar and the second surface is planar.
  8. 8. The battery cell according to claim 1, wherein a maximum height of the gap in a thickness direction of the first wall is 0.02mm to 0.2mm.
  9. 9. The battery cell of claim 8, wherein the gap has a maximum height in a thickness direction of the first wall of 0.05mm to 0.1mm.
  10. 10. The battery cell according to claim 2, wherein the gap is provided on at least one side of the third terminal portion in a longitudinal direction of the first terminal portion, and the first portion and the second portion are arranged in the longitudinal direction of the first terminal portion.
  11. 11. The battery cell according to claim 10, wherein the number of the third terminal portions is at least two, at least one of the third terminal portions is a preset terminal portion, all of the third terminal portions except the preset terminal portion are located on the same side of the preset terminal portion in the longitudinal direction of the first terminal portion, and the gap is provided on a side of at least one of the preset terminal portions in the longitudinal direction of the first terminal portion facing away from the rest of the third terminal portions.
  12. 12. The battery cell according to claim 10, wherein the first terminal portion has a second through hole, and an end of the third terminal portion facing away from the electrode assembly has a stopper boss located in the second through hole, the stopper boss being in contact with at least part of the first terminal portion toward a side of the electrode assembly in a thickness direction of the first wall; The first terminal part is provided with at least two first end faces which are oppositely arranged along the length direction of the first terminal part, and the minimum distance between one first end face and the limiting boss and the minimum distance between the other first end face and the limiting boss are equal, and/or the first terminal part is provided with at least two second end faces which are oppositely arranged along the width direction of the first terminal part, and the minimum distance between one second end face and the limiting boss and the minimum distance between the other second end face and the limiting boss are equal.
  13. 13. The battery cell according to claim 10, wherein the first terminal portion has a second through hole, one end of the third terminal portion facing away from the electrode assembly has a stopper boss located in the second through hole, one side of the stopper boss facing the electrode assembly in a thickness direction of the first wall is in contact with at least a portion of the first terminal portion, the first terminal portion has at least two second end faces arranged opposite in a width direction of the first terminal portion, and a minimum distance between the stopper boss and each of the second end faces in the width direction of the first terminal portion is 1.2mm to 4.5mm.
  14. 14. The battery cell according to claim 13, wherein a minimum distance between the limiting boss and each of the second end faces in the width direction of the first terminal portion is 1.5mm to 3.5mm.
  15. 15. The battery cell according to claim 10, wherein the first terminal portion has a length of 25mm to 70mm, and/or the first terminal portion has a plate-like shape, and a thickness of the first terminal portion in a thickness direction of the first wall is 1.2mm to 4mm.
  16. 16. The battery cell of any one of claims 1-15, wherein the substrate of the first terminal portion is aluminum.
  17. 17. The battery cell according to any one of claims 1 to 15, wherein a surface of a side of the first terminal portion facing away from the electrode assembly is a preset surface, and the preset surface is a plane.
  18. 18. The battery cell of any one of claims 1-15, wherein the second terminal portion is welded to the electrode assembly.
  19. 19. The battery cell of any one of claims 1-15, wherein the housing comprises: A housing; And the end cover is connected with the shell, the electrode assembly is positioned in a space surrounded by the shell and the end cover, the first wall is formed on the end cover, and the insulating piece is positioned between the first terminal part and the end cover.
  20. 20. A battery device, characterized by comprising: a case; The battery cell of any one of claims 1-19, wherein the battery cell is mounted to the housing.

Description

Battery cell, battery device and electricity utilization device Technical Field The disclosure relates to the field of battery technology, and in particular relates to a battery cell, a battery device and an electricity utilization device. Background Batteries are increasingly used in life and industry, and for example, new energy automobiles equipped with batteries have been widely used. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the related art, an electrode terminal assembly of a battery cell is electrically connected to the electrode assembly, and after a first terminal part of the electrode terminal assembly is used for a while in a vibration environment, there may be a case where the flatness of a surface of a side of the first terminal facing away from the electrode assembly is poor. Disclosure of utility model To solve the related art problems, it is desirable for the embodiments of the present disclosure to provide a battery cell, a battery device, and an electric device such that the first terminal portion of an electrode terminal assembly maintains better flatness of a surface of the first terminal portion facing away from the electrode assembly in use under a vibration environment. The technical scheme of the embodiment of the disclosure is realized as follows: a first aspect of an embodiment of the present disclosure provides a battery cell, including: a housing including a first wall having a first through-hole therein; An electrode assembly accommodated in the case; An electrode terminal assembly including a first terminal portion, a second terminal portion and a third terminal portion, the first terminal portion being located on a side of the first wall facing away from the electrode assembly, the second terminal portion being located on a side of the first wall facing toward the electrode assembly, the second terminal portion being electrically connected with the electrode assembly, the third terminal portion being located at least partially within the first through-hole, the third terminal portion being connected with the first terminal portion and the second terminal portion, respectively, the first wall being partially mounted between the first terminal portion and the second terminal portion; An insulator is at least partially disposed between the first terminal portion and the first wall, the insulator and the first terminal portion forming a gap therebetween. In the embodiment of the disclosure, a gap is formed between the insulating piece and the first terminal part, vibration extrusion of the insulating piece to the first terminal part in the process of transporting and using the battery cell can be relieved through the gap, and surface warping of one side, deviating from the electrode assembly, of the first terminal part is reduced. The gap between the insulating member and the first terminal portion can provide a space for the first terminal portion to be deformed, and thermal deformation of the first terminal portion, which is caused by the influence of a heat source in the mounting process and is away from the electrode assembly, is counteracted as much as possible by reverse pre-deformation of the first terminal portion, so that the surface of the side of the first terminal portion, which is away from the electrode assembly, has better flatness as a whole. In some embodiments, the gap has a first portion close to the first through hole and a second portion distant from the first through hole, an arrangement direction of the first portion and the second portion is arranged to intersect a thickness direction of the first wall, and a height of the first portion is smaller than a height of the second portion in the thickness direction of the first wall. In the embodiment of the disclosure, the insulating piece can better support the first terminal portion of the pre-deformation through the difference of the heights of the first portion and the second portion, so that the suspension degree of the first terminal portion of the pre-deformation is reduced, the first terminal portion is enabled to generate more proper pre-deformation, and therefore the heat deformation of the first terminal portion, which is away from the electrode assembly, caused by the influence of the heat source in the battery cell installation process, can be better counteracted, and the surface of one side of the first terminal portion, which is away from the electrode assembly, has better flatness. In some embodiments, the height of the gap in the thickness direction of the first wall increases gradually in a direction in which the first portion of the gap points toward the second portion of the gap. In the embodiment of the disclosure, through the gradual change of the height of the gap, the first terminal part can be well attached to the insulating part after pre-deformation, the insulating part can well support the pre-deformed first terminal part,