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CN-119069906-B - Battery shell, battery and electric equipment

CN119069906BCN 119069906 BCN119069906 BCN 119069906BCN-119069906-B

Abstract

The application provides a battery shell, a battery and electric equipment. The application provides a battery shell, which comprises a shell body and a cover plate, wherein the shell body and the cover plate are fixedly connected through a welding part, the welding part comprises a first welding part, the first welding part is at least connected with the outer surfaces of the side walls of the cover plate and the shell body at the same time, the welding strength of the shell body and the cover plate is improved, the risk of separation between the shell body and the cover plate in the use process of the battery can be reduced, the occurrence of safety accidents such as battery leakage and the like can be further effectively reduced, and the safety performance of the battery is improved.

Inventors

  • LIANG LIWEI
  • Ma Chenchong
  • YANG YUCHUAN
  • HU SHUMIN
  • OUYANG JINZHONG

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260505
Application Date
20230531

Claims (12)

  1. 1. A battery case, characterized in that the battery case comprises a cover plate and a case body, at least one end of the case body has an opening in a first direction, and the cover plate is adapted to cover the opening of the case body by a welding portion and form an accommodation space; The cover plate is provided with a first surface and a second surface which are oppositely arranged, wherein the first surface is a side surface of the cover plate, which is away from the accommodating space, and the side wall of the shell body is provided with a third surface and a fourth surface which are oppositely arranged, and the third surface is a side surface of the shell body, which is away from the accommodating space; the welding part comprises a first welding part; The cross section of the battery shell perpendicular to a third direction is A, the intersection point of the first welding part and the first surface is B, and the third direction is perpendicular to the first direction, wherein an included angle between an extension line of a profile line of the third surface on the cross section and a connecting line of the A point and the B point is alpha, 0< alpha <90 degrees, and the extension line extends from the B point to a plane where the second surface is located and along the first direction; The distance between the point B and the plane of the first surface of the cover plate corresponding to the point B is W 1 , the distance between the point A and the second surface is W 2 , the distance between the point B and the fourth surface is W 3 , the W 1 、W 2 、W 3 is calculated in the same unit, and the first welding part meets 0.2W 3 ≤(W 1 -W 2 )×tanα≤W 3 .
  2. 2. The battery housing of claim 1, wherein 30 ° - α -60 °.
  3. 3. The battery case according to claim 1, wherein an outer edge of the first welding portion does not exceed the second surface and the fourth surface in a direction toward the receiving space.
  4. 4. The battery housing of claim 1, wherein the orthographic projection of the point a on the second surface is a point a' that is located within or on the boundary of the orthographic projection of the housing body on the cover plate.
  5. 5. The battery housing of any one of claims 1-4, wherein the front projection of the cover plate and the front projection of the housing body do not overlap in both a second direction and the third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.
  6. 6. The battery case according to any one of claims 1 to 5, wherein a gap is provided between the case body and the cover plate in the first direction, and the gap has a width L 1 ,0<L 1 mm or less than 0.05mm.
  7. 7. The battery housing of any one of claims 1-4, wherein the first weld protrudes relative to the first surface and/or the third surface, the first weld protruding relative to the first surface by a maximum dimension of L 2 ; 0<L 2 ≤0.05 mm;0<L 3 ≤0.05 mm。
  8. 8. the battery housing of any one of claims 1-4, wherein the point a is a distance W 2 from the second surface and the point B is a distance W 3 ,0.05mm≤W 2 ≤W 3 from the fourth surface.
  9. 9. The battery housing of claim 8, wherein 30 ° - α +.45 ° when W 2 ＜W 3 .
  10. 10. The battery case according to any one of claims 1 to 9, wherein both ends of the case body have opening portions in the first direction, the battery case comprising two cover plates; wherein the second surface is the surface of the battery case having the largest surface area.
  11. 11. A battery, characterized in that the battery comprises a battery housing as claimed in any one of claims 1-10, and a pole core, wherein the pole core is accommodated in the accommodation space of the battery housing.
  12. 12. An electric device is characterized in that, the powered device comprising the battery of claim 11.

Description

Battery shell, battery and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a battery shell, a battery and electric equipment. Background As the use of batteries in various fields has increased, battery safety has become one of the most interesting issues for large battery manufacturers and consumers. Generally, a battery includes a battery housing and a pole core accommodated in the battery housing, where the battery housing generally includes a housing body and a cover plate, and in order to ensure safety of the battery in a subsequent use process, connection firmness between the cover plate and the housing body needs to be ensured. Therefore, how to improve the connection firmness between the cover plate and the case body is a problem to be solved in the battery field. Disclosure of Invention In view of the above, the application provides a battery case, which comprises a case body and a cover plate, wherein the case body and the cover plate are fixedly connected through a welding part, the welding part comprises a first welding part, and the first welding part is at least connected with a plurality of surfaces of the cover plate and the outer surface of the side wall of the case body at the same time, so that the welding strength of the case body and the cover plate is improved, the risk of separation between the case body and the cover plate in the use process of the battery can be reduced, the occurrence of safety accidents such as battery leakage can be effectively reduced, and the safety performance of the battery is improved. The first aspect of the present application provides a battery case comprising a cover plate and a case body, at least one end of the case body having an opening in a first direction, the cover plate being adapted to cover the opening of the case body by a welding portion and to form an accommodation space; The cover plate is provided with a first surface and a second surface which are oppositely arranged, wherein the first surface is a side surface of the cover plate, which is away from the accommodating space, and the side wall of the shell body is provided with a third surface and a fourth surface which are oppositely arranged, and the third surface is a side surface of the shell body, which is away from the accommodating space; the welding part comprises a first welding part; And on a section of the battery shell perpendicular to a third direction, an intersection point of the first welding part and the first surface is A, an intersection point of the first welding part and the third surface is B, and the third direction is perpendicular to the first direction, wherein an included angle between an extension line of a profile line of the third surface on the section and a connecting line of the A point and the B point is alpha, 0< alpha <90 degrees, and the extension line extends from the B point to a plane where the second surface is located and along the first direction. It can be understood that the apron has certain thickness to still have the lateral wall of connecting first surface and second surface between the first surface of apron and the second surface, and, in the above-mentioned battery case, the contained angle alpha between the extension line of line AB and shell body outline satisfies 0< alpha <90, so, be difficult to release, first welded part has connected the apron and the third surface of shell body (the surface of shell body lateral wall) simultaneously at least, the welding strength of shell body and apron has been promoted, can reduce the risk of separation between shell body and the apron in the battery use, and then can effectively reduce the emergence of incident such as battery weeping, promote the security performance of battery. Alternatively, the process may be carried out in a single-stage, alpha is more than or equal to 30 degrees and less than or equal to 60 degrees. Optionally, the distance between the point B and the plane of the first surface of the cover plate corresponding to the point B is W 1, the distance between the point A and the second surface is W 2, the distance between the point B and the fourth surface is W 3, the first welding part is 0.2W 3≤(W1-W2)×tanα≤W3, and the W 1、W2、W3 is calculated in the same unit. Further, in a direction toward the accommodating space, the outer edge of the first welding portion does not exceed the second surface and the fourth surface. Optionally, the orthographic projection of the point a on the second surface is a point a ', and the point a' is located in or on the boundary of the orthographic projection of the shell body on the cover plate. Optionally, the front projection of the cover plate and the front projection of the shell body are not overlapped along the second direction and the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. Optionally, in the first di