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CN-224232749-U - Battery cell, battery device and electricity utilization device

CN224232749UCN 224232749 UCN224232749 UCN 224232749UCN-224232749-U

Abstract

The application belongs to the technical field of battery production and provides a battery unit, a battery device and an electric device, wherein the battery unit comprises a shell, a cover body and an electrode assembly, the cover body is connected to the shell and forms a containing cavity together with the shell, the cover body comprises a first part, a second part and a bending part, the first part protrudes towards the direction far away from the electrode assembly relative to the second part, the bending part is connected with the first part and the second part, the first part, the second part and the bending part are welded with the shell, the part welded and fused between the bending part and the shell has bending penetration, the part welded and fused between the first part and the shell has first penetration, the part welded between the second part and the shell has second penetration, the bending penetration is larger than or smaller than the first penetration, and the bending penetration is larger than or smaller than the second penetration. The application aims to improve the welding quality between the cover body and the shell and optimize the welding cost.

Inventors

  • ZHOU WENLIN
  • SU HUASHENG
  • ZHU LINLIN
  • HUANG SHOUJUN
  • ZHENG YULIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250304

Claims (14)

  1. 1. A battery cell (1120), comprising: A housing (11212); The cover body (11211) is connected to the shell (11212) and forms a containing cavity (11213) together with the shell (11212), the cover body (11211) comprises a first part (11214), a second part (11215) and a bending part (11216), the first part (11214) protrudes relative to the second part (11215) towards a direction away from the containing cavity (11213), and the bending part (11216) is connected with the first part (11214) and the second part (11215); an electrode assembly (1122) housed in the housing chamber (11213); Wherein, first part (11214), second part (11215) and bend portion (11216) all with casing (11212) looks welding and respectively correspond formation first welding portion (1127), second welding portion (1128) and bend welding portion (1126), bend welding portion (1126) have bend penetration (L1), first welding portion (1127) have first penetration (L2), second welding portion (1128) have second penetration (L3), bend penetration (L1) is greater than or less than first penetration (L2), and bend penetration (L1) is greater than or less than second penetration (L3).
  2. 2. The battery cell (1120) of claim 1, wherein the bending penetration (L1) is less than the first penetration (L2) and the bending penetration (L1) is less than the second penetration (L3).
  3. 3. The battery cell (1120) according to claim 2, wherein the bending penetration (L1) ranges from 0.2mm to 0.6mm, the first penetration (L2) ranges from 0.61mm to 1.5mm, and the first penetration (L2) ranges from 0.61mm to 1.5mm.
  4. 4. The battery cell (1120) of claim 1, wherein the bending penetration (L1) is greater than the first penetration (L2) and the bending penetration (L1) is greater than the second penetration (L3).
  5. 5. The battery cell (1120) of claim 4, wherein said bending penetration (L1) ranges from 0.61mm to 1.5mm, said first penetration (L2) ranges from 0.2mm to 0.6mm, and said second penetration (L3) ranges from 0.2mm to 0.6mm.
  6. 6. The battery cell (1120) of claim 1, wherein said first penetration (L2) is equal to said second penetration (L3).
  7. 7. The battery cell (1120) according to any one of claims 1 to 6, wherein said battery cell (1120) further comprises a transfer member (1129) and an electrode terminal (1123), said electrode terminal (1123) is disposed at said second portion (11215), said electrode assembly (1122) has a tab (1125) disposed opposite said first portion (11214), said tab (1125) is connected to said electrode terminal (1123) through said transfer member (1129), said first portion (11214) protrudes with respect to said second portion (11215) along a first direction (X), a third weld (1130) is formed between said tab (1125) and said transfer member (1129), said third weld (1130) being at least partially opposite said bend (11216) in a second direction (Y), said second direction (Y) being perpendicular to said first direction (X).
  8. 8. The battery cell (1120) of any of claims 1-6, wherein said bent portion (11216) comprises a first bent portion (11217), a flat portion (11219), and a second bent portion (11218), said flat portion (11219) being connected between said first bent portion (11217) and said second bent portion (11218), said first bent portion (11217) being connected to said first portion (11214), said second bent portion (11218) being connected to said second portion (11215); The welding fusion part between the first bending part (11217) and the shell (11212) has a first sub-penetration, the welding fusion part between the second bending part (11218) and the shell (11212) has a second sub-penetration, the welding fusion part between the flat part (11219) and the shell (11212) has a third sub-penetration, and both the first sub-penetration and the second sub-penetration are larger than the third sub-penetration.
  9. 9. The battery cell (1120) of claim 8, wherein said first sub-penetration is equal to said second sub-penetration.
  10. 10. The battery cell (1120) of any of claims 1-6, wherein a side edge of said cover (11211) extends to an outer side of said housing (11212) such that said housing (11212) is welded to said cover (11211) at the outer side.
  11. 11. The battery cell (1120) of any of claims 1-6, wherein said housing (11212) is attached to a side edge of said cover (11211) and extends to a top surface of said cover (11211) such that said housing (11212) is welded to said cover (11211) at the top.
  12. 12. The battery cell (1120) according to any one of claims 1 to 6, wherein two second portions (11215) are provided, the first portion (11214) is connected between the two second portions (11215), and the bent portions (11216) are formed at positions where the second portions (11215) are connected to the first portion (11214).
  13. 13. A battery device (1100), characterized in that the battery device (1100) comprises a battery cell (1120) according to any of claims 1-12.
  14. 14. An electrical device, characterized in that it comprises a battery cell (1120) according to any one of claims 1-12, or, The power utilization device comprises a battery device (1100) according to claim 13, the battery device (1100) being adapted to store or provide electrical energy.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of battery production, in particular to a battery cell, a battery device and an electric device. Background Among the many types of secondary batteries, the convex hull battery can improve the internal space utilization rate of the battery to some extent due to its unique structural design, thereby exhibiting advantages in some specific application scenarios. The shell of the convex hull battery is provided with a shell and a cover body, the shell and the cover body are fixed in a welding mode, wherein the cover body is provided with a convex part, so that a bent part is formed on the cover body, and the position where the bent part is connected with the shell is also required to be welded. In the related art, the positions of the bent part and other parts on the cover body, which are welded with the shell, are uniformly higher or lower in welding standard, so that the welding is excessively dead, the welding failure is easy to occur between the bent part and the shell, or the problem of increased welding cost is caused, and the welding strength and the cost optimization are mutually restricted when the cover body and the shell are welded. Disclosure of utility model The application aims to provide a battery cell, a battery device and an electricity utilization device, and aims to solve the technical problem that the welding strength and the cost optimization are mutually restricted when a convex hull battery is welded with a cover body and a shell. In a first aspect, the present application provides a battery cell comprising: A housing; The cover body comprises a first part, a second part and a bending part, wherein the first part protrudes towards the direction away from the accommodating cavity relative to the second part, and the bending part is connected with the first part and the second part; The electrode assembly is accommodated in the accommodating cavity and is arranged opposite to the first part and the second part; the first part, the second part and the bending part are welded with the shell and respectively correspond to the first welding part, the second welding part and the bending welding part, the bending welding part has bending penetration, the first welding part has first penetration, the second welding part has second penetration, the bending penetration is larger than or smaller than the first penetration, and the bending penetration is larger than or smaller than the second penetration. In this embodiment, the particularity of the stress at the connection position of the bending portion and the shell is fully considered, so that according to whether the welding strength between the bending portion and the shell can be the bottleneck of welding failure, the bending penetration between the bending portion of the cover and the shell is adjusted relative to the first penetration between the first portion and the shell and relative to the second penetration between the second portion and the shell, and a flexible welding penetration design is adopted, so as to achieve the purposes of finding a balance point (or a balance interval) between the welding quality and the cost optimization, improving the welding quality between the cover and the shell, and optimizing the welding cost. In one embodiment, the bend penetration is less than the first penetration and the bend penetration is less than the second penetration. In this embodiment, the penetration of the welding fusion portion between the bending portion and the housing is reduced, so that the production cost can be reduced on the premise of ensuring the welding strength and the welding quality between the bending portion and the housing. In one embodiment, the bending penetration ranges from 0.2mm to 0.6mm, the first penetration ranges from 0.61mm to 1.5mm, and the first penetration ranges from 0.61mm to 1.5mm. In this embodiment, the specific numerical ranges of the folding penetration, the first penetration and the second penetration are controlled, so that the accurate control of the welding strength of the first welding part, the second welding part and the bending welding part is facilitated, and the reliability is improved. In one embodiment, the bend penetration is greater than the first penetration and the bend penetration is greater than the second penetration. In this embodiment, the penetration of the welded portion between the bending portion and the case is increased, so that the welding strength and welding quality between the bending portion and the case can be ensured on the premise of making the increase control of the production cost smaller. In one embodiment, the bending penetration ranges from 0.61mm to 1.5mm, the first penetration ranges from 0.2mm to 0.6mm, and the second penetration ranges from 0.2mm to 0.6mm. In this embodiment, the specific numerical ranges of the folding penetration,