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CN-224204184-U - Battery case and battery cell

CN224204184UCN 224204184 UCN224204184 UCN 224204184UCN-224204184-U

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery monomer. The battery case includes a case body and a sealing member. The shell comprises a plurality of side walls formed by bending a plate, wherein the side walls are enclosed to form a containing cavity, the side walls comprise a first wall body formed by bending the head end of the plate and a second wall body formed by bending the tail end of the plate, the first wall body and the second wall body are welded to form a welding seam, and a welding mark area is formed on the inner wall and the outer wall of the shell after scar removal treatment of the welding seam. The sealing element extends along a first direction, and can completely cover a welding and printing area on the inner wall of the shell along a second direction, wherein the first direction is the length direction of the welding line, and the second direction is the width direction of the welding line. The battery shell has high structural strength and long service life.

Inventors

  • LI JIANJU
  • SHEN XIAORONG

Assignees

  • 深圳市科达利实业股份有限公司

Dates

Publication Date
20260505
Application Date
20250331

Claims (10)

  1. 1. Battery case, its characterized in that includes: The shell (1), the shell (1) comprises a plurality of side walls formed by bending a plate, a plurality of accommodating cavities (101) are formed by enclosing the side walls, the side walls comprise a first wall body (11) formed by bending the head end of the plate and a second wall body (12) formed by bending the tail end of the plate, the first wall body (11) and the second wall body (12) are welded to form welding seams, and welding mark areas are formed on the inner wall and the outer wall of the shell (1) after scar removal treatment of the welding seams; The sealing piece (2), the sealing piece (2) extends along first direction, along the second direction, the sealing piece (2) can be completely covered the welding area on the inner wall of the shell (1), the first direction is the length direction of the welding seam, and the second direction is the width direction of the welding seam.
  2. 2. The battery case according to claim 1, wherein the sealing member (2) includes a sealing rubber strip, which is adhered to the welding region.
  3. 3. The battery case according to claim 2, wherein the sealing rubber strip HAs a thickness H, the value of H ranges from 0.03mm to 0.5mm, and the Shore hardness of the sealing rubber strip ranges from 60HA to 80HA.
  4. 4. The battery case according to claim 2, wherein the adhesive strength of the joint strip is not less than 3N/mm 2 .
  5. 5. The battery case according to claim 2, wherein the covering width of the sealing rubber strip in the second direction is B, B being equal to or greater than 1mm.
  6. 6. Battery case according to claim 1, characterized in that the seal (2) is a spot-gluing which can be applied to the welded area.
  7. 7. The battery case according to claim 1, further comprising two cover plates (3), wherein the accommodating chamber (101) has two openings, and the two cover plates (3) cover the two openings of the accommodating chamber (101), respectively.
  8. 8. The battery case according to claim 7, wherein the plurality of side walls further includes a third wall body (13) and a fourth wall body (14), the third wall body (13) and the fourth wall body (14) being adjacent to the first wall body (11) and the second wall body (12), respectively, opposite sides of the cover plate (3) being welded to the third wall body (13) and the fourth wall body (14), respectively, and a length L of the seal member (2) being not greater than a length of the case (1) in the first direction.
  9. 9. The battery case according to claim 7, wherein the plurality of side walls further includes a fifth wall body (15), the fifth wall body (15) being located on opposite sides of the first wall body (11) and the second wall body (12), one side of the cover plate (3) being welded to the first wall body (11) and the second wall body (12), respectively, along a thickness direction of the cover plate (3), and the other side of the cover plate (3) being welded to the fifth wall body (15), and both ends of the sealing member (2) being not less than 1.5mm from both ends of the case (1), respectively, along the first direction.
  10. 10. Battery cell, characterized in that it comprises a battery cell pack (4) and a battery case according to any one of claims 1-9, said battery cell pack (4) being arranged in said housing cavity (101).

Description

Battery case and battery cell Technical Field The utility model relates to the technical field of batteries, in particular to a battery shell and a battery monomer. Background The longer power battery case (the length exceeds 350 mm) is usually manufactured by adopting a stainless steel plate bending and welding forming process, specifically, the stainless steel plate needs to be bent to obtain the shape of the case, and then the bent head end and the bent tail end of the plate are spliced and welded for fixing, wherein in order not to influence the assembly of the battery core and in order to be attractive, the welding seam is welded and then subjected to the weld scar removing treatment. However, after the scar removing treatment of the welding seam, uneven welding mark areas (short for welding mark areas) appear on the inner and outer surfaces of the battery case. After the battery is filled with the electrolyte, the electrolyte is easy to permeate and erode the welding seam area through the concave-convex structure of the welding seam area, particularly, in the long-term charge-discharge cycle of the battery, the metal fatigue strength of the battery case is reduced by 40% -60%, the risk of stress corrosion cracking is increased by 3-5 times, and finally, the penetrability crack of the battery case and the electrolyte leakage are caused. Therefore, it is needed to provide a battery case and a battery cell to solve the above problems. Disclosure of utility model A first object of the present utility model is to provide a battery case having high structural strength and long service life. To achieve the purpose, the utility model adopts the following technical scheme: A battery case, comprising: The shell comprises a plurality of side walls formed by bending a plate, a plurality of accommodating cavities are formed by enclosing the side walls, the side walls comprise a first wall body formed by bending the head end of the plate and a second wall body formed by bending the tail end of the plate, the first wall body and the second wall body are welded to form welding seams, and welding mark areas are formed on the inner wall and the outer wall of the shell after scar removal treatment of the welding seams; The sealing piece extends along a first direction, and can completely cover the welding area on the inner wall of the shell along a second direction, wherein the first direction is the length direction of the welding line, and the second direction is the width direction of the welding line. As an alternative solution of the battery case, the sealing member includes a sealing rubber strip, and the sealing rubber strip is adhered to the welding area. As an alternative technical scheme of the battery case, the thickness of the sealing rubber strip is H, the value range of H is 0.03mm-0.5mm, and the Shore hardness of the sealing rubber strip is 60HA-80HA. As an alternative technical scheme of the battery case, the bonding strength of the sealing rubber strip is not less than 3N/mm 2. As an alternative technical scheme of the battery case, along the second direction, the coverage width of the sealing rubber strip is B, and B is more than or equal to 1mm. As an alternative solution of the battery case, the sealing member is a spot-gluing, and the spot-gluing can be applied to the welding area. As an alternative solution of the battery case, the battery case further includes two cover plates, the accommodating cavity has two openings, and the two cover plates are respectively covered on the two openings of the accommodating cavity. As an optional technical scheme of the battery case, the plurality of side walls further comprise a third wall body and a fourth wall body, the third wall body and the fourth wall body are respectively adjacent to the first wall body and the second wall body, two opposite sides of the cover plate are respectively welded with the third wall body and the fourth wall body, and the length L of the sealing member is not greater than the length of the case along the first direction. As an alternative technical scheme of the battery case, the plurality of side walls further comprise a fifth wall body, the fifth wall body is located on opposite sides of the first wall body and the second wall body, along a thickness direction of the cover plate, one side of the cover plate is welded with the first wall body and the second wall body respectively, the other side of the cover plate is welded with the fifth wall body, and along the first direction, distances from two ends of the sealing element to two ends of the case are not smaller than 1.5mm respectively. The second object of the utility model is to provide a battery cell which has good safety and long service life. To achieve the purpose, the utility model adopts the following technical scheme: The battery monomer comprises a battery core package and the battery shell, and the battery core package is arranged in the accommodating cavity. The