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CN-122000415-A - Battery core and electric equipment

CN122000415ACN 122000415 ACN122000415 ACN 122000415ACN-122000415-A

Abstract

The application relates to the technical field of batteries, in particular to a battery cell and electric equipment. The battery cell comprises a cover plate and a shell, wherein the cover plate comprises a cover plate body and a first plastic part, the first plastic part is connected with one side of the cover plate body, the outer edge of the first plastic part is arranged on the inner side of the outer edge of the cover plate body, a liquid injection hole penetrating through the cover plate body is formed in the cover plate body, the first plastic part comprises a liquid outlet groove and a liquid injection groove which are communicated with each other, the liquid injection groove is correspondingly communicated with the liquid injection hole, a liquid injection guide hole penetrating through the liquid injection groove is formed in the first bottom wall of the liquid injection groove, the shell is connected with the outer edge of the cover plate body, an exhaust gap is formed between the shell and the liquid outlet groove, and an exhaust notch communicated with the exhaust gap is formed in the side wall of the liquid outlet groove. The application solves the problems that in the existing battery cell structure, the insulating adhesive tape on the surface of the electrode group and the electrolyte diversion hole arranged below the plastic under the cover plate are easy to form physical interference, so that the exhaust hole is blocked, and the battery cell is expanded due to incomplete exhaust of the battery cell.

Inventors

  • SHEN LIANGJUN

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260311

Claims (10)

  1. 1. The battery cell is characterized by comprising a cover plate and a shell, wherein the cover plate is provided with a thickness direction, the cover plate comprises a cover plate body and a first plastic part, the first plastic part is connected with one side of the cover plate body in the thickness direction, projection of the first plastic part and the cover plate body is carried out on a plane perpendicular to the thickness direction along the thickness direction, and the projection profile of the first plastic part is completely within the projection profile range of the cover plate body; the cover plate body is provided with a liquid injection hole penetrating through the cover plate body, the first plastic part comprises a liquid outlet groove and a liquid injection groove which are communicated with each other, the liquid injection groove is correspondingly communicated with the liquid injection hole, and a liquid injection guide hole is formed in the first bottom wall of the liquid injection groove; The shell is connected with the part of the cover plate body corresponding to the outer edge of the projection outline of the cover plate body, an exhaust gap is formed between the cover plate body and the liquid outlet groove, and an exhaust notch communicated with the exhaust gap is formed in the side wall of the liquid outlet groove.
  2. 2. The battery cell according to claim 1, wherein an exhaust groove is formed in a side, facing the first plastic part, of the cover plate body, one end of the exhaust groove extends to the liquid injection groove, and the other end of the exhaust groove extends to the liquid outlet groove so as to be communicated with the liquid injection groove and the liquid outlet groove.
  3. 3. The cell of claim 2, wherein the second bottom wall of the liquid outlet tank is provided with a liquid outlet.
  4. 4. The cell of claim 3, wherein the cover plate further has a length direction, the length direction is perpendicular to the thickness direction, the liquid outlet groove and the liquid injection groove are respectively disposed at two ends of the first plastic part opposite to each other in the length direction, and the air exhaust groove extends along the length direction.
  5. 5. The battery cell of claim 4, wherein the cover plate is S1/S2=0.15-0.3, S1 is a cross-sectional area of a cross section of the exhaust groove perpendicular to the length direction, S2 is a cross-sectional area of the liquid injection hole, and a cutting direction of the cross section is perpendicular to the thickness direction.
  6. 6. The cell of claim 5, wherein the cover plate further has a width direction, the length direction, the width direction, and the thickness direction being perpendicular to each other; the exhaust groove is a rectangular groove, and the liquid injection hole is a round hole; S1=m×n, m is the dimension of the exhaust groove in the thickness direction, n is the dimension of the exhaust groove in the width direction, s2=pi×r 2 , r is the radius of the liquid injection hole.
  7. 7. The cell of claim 4, wherein a cross-sectional area of the vent indentation perpendicular to the length direction is > a cross-sectional area of the fluid injection hole.
  8. 8. The cell according to claim 4, wherein the vent gap is opened at one side of the side wall in the length direction, and a side of the vent gap facing the cover plate body is opened, and a distance between the vent gap and the second bottom wall in the thickness direction is >3mm.
  9. 9. The cell of any one of claims 1-8, wherein a central region of the first bottom wall is disposed opposite the fluid injection hole, the central region of the first bottom wall is of a solid structure, the number of fluid injection diversion holes is plural, and the plurality of fluid injection diversion holes are disposed along a circumferential direction of the solid structure.
  10. 10. A powered device comprising a battery cell as claimed in any one of claims 1-9.

Description

Battery core and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a battery cell and electric equipment. Background In the production and manufacturing process of the battery, a battery core pre-charging stage and a baking stage before liquid injection are key processes for guaranteeing the performance and the safety of the battery. The pre-charging process is a core link of the first charging activation of the battery core, in the process, the electrolyte and the electrode material generate interface reaction to inevitably generate trace gas, and the baking process before liquid injection aims at removing moisture in the battery core (comprising parts such as a pole group and a shell) and avoiding harmful gas generated by the reaction of the moisture and the electrolyte to influence the performance of the battery, and in the baking process, trace organic matters and moisture remained in the battery core are evaporated to form a certain amount of gas. In order to realize effective discharge of gas generated in the above procedure, the existing cell structure is generally provided with an electrolyte diversion hole below the plastic under the cover plate as an exhaust hole for guiding the gas inside the cell to the outside, so as to avoid pressure rise caused by accumulation of the gas inside the cell. However, during the assembly process of the battery cell, the surface of the pole group is generally covered with an insulating tape for fixing the pole group structure and preventing the pole group from being shorted with the metal components such as the housing, the cover plate, etc. However, the electrode group adhesive tape is prone to position deviation, wrinkling or excessive cladding, so that the adhesive tape and an electrolyte diversion hole arranged below the cover plate form physical interference, further the exhaust hole is blocked, and the battery core is inflated due to incomplete exhaust of the battery core. Disclosure of Invention The application aims to provide a battery cell and electric equipment, so that the problem that the battery cell is inflated due to the fact that an electrolyte diversion hole is arranged below plastic under a cover plate in an existing battery cell structure and used as an exhaust hole to guide gas inside the battery cell to the outside is solved, but an insulating adhesive tape on the surface of a pole group and the exhaust hole are easy to form physical interference, so that the exhaust hole is blocked. According to the first aspect of the application, a battery cell is provided, the cover plate is provided with a thickness direction, the battery cell comprises a cover plate body and a shell, the cover plate comprises a cover plate body and a first plastic part, the first plastic part is connected with one side of the cover plate body in the thickness direction, projection of the first plastic part and the cover plate body is carried out on a plane perpendicular to the thickness direction along the thickness direction, the projection outline of the first plastic part completely falls within the projection outline range of the cover plate body, the cover plate body is provided with a liquid injection hole penetrating through the cover plate body, the first plastic part comprises a liquid outlet groove and a liquid injection groove which are communicated with each other, the liquid injection groove is correspondingly communicated with the liquid injection hole, the first bottom wall of the liquid injection groove is provided with a liquid injection guide hole, the shell is connected with the part of the cover plate body corresponding to the outer edge of the projection outline of the cover plate body, an exhaust gap is formed between the shell and the liquid outlet groove, and the side wall of the liquid injection groove is provided with an exhaust gap communicated with the exhaust gap. In any of the above technical solutions, further, an exhaust groove is provided on a side of the cover plate body facing the first plastic part, one end of the exhaust groove extends to the liquid injection groove, and the other end extends to the liquid outlet groove, so as to communicate the liquid injection groove with the liquid outlet groove. In any of the above technical solutions, further, a liquid outlet is formed in the second bottom wall of the liquid outlet tank. In any of the above technical solutions, further, the cover plate has a length direction, the length direction is perpendicular to the thickness direction, the liquid outlet groove and the liquid injection groove are respectively disposed at two opposite ends of the first plastic part in the length direction, and the air exhaust groove extends along the length direction. In any of the above technical solutions, the cover plate further satisfies that S1/s2=0.15 to 0.3, S1 is a cross-sectional area of a cross section of the exhaust groove perpendicular t