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CN-122000416-A - Battery core and electric equipment

CN122000416ACN 122000416 ACN122000416 ACN 122000416ACN-122000416-A

Abstract

The application relates to the technical field of battery manufacturing, 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 cover plate body is provided with a liquid injection hole, the first plastic part comprises a liquid injection groove corresponding to the liquid injection hole, the liquid injection groove is arranged at one end of the first plastic part in the length direction, a liquid injection guide hole is formed in the bottom wall of the liquid injection groove, the shell is connected with the outer edge of the cover plate body, an exhaust gap is reserved between the shell and the liquid injection groove, one side of the side wall of the liquid injection groove in the length direction is provided with an exhaust groove recessed towards the inside of the liquid injection groove, one side of the exhaust groove in the length direction is opened, and an exhaust hole is formed in the exhaust groove so as to communicate the exhaust gap with the liquid injection 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 length direction and a thickness direction which are perpendicular to each other, 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 contour of the first plastic part completely falls in the projection contour 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 injection groove corresponding to the liquid injection hole, the liquid injection groove is arranged at one end of the first plastic part in the length direction, and the bottom wall of the liquid injection groove is provided with a liquid injection guide hole penetrating through the cover plate body; The side wall of the liquid injection groove is provided with an exhaust groove which is concave towards the inside of the liquid injection groove at one side in the length direction, one side of the exhaust groove in the length direction is opened, the exhaust groove is provided with an exhaust hole penetrating through the exhaust groove, and the exhaust hole is communicated with the exhaust gap and the liquid injection groove.
  2. 2. The cell of claim 1, wherein the cover plate further has a width direction, the length direction, the width direction, and the thickness direction are perpendicular to each other, and one side of the exhaust groove facing the cover plate body, two sides opposite to each other in the width direction, and one side in the length direction are all open.
  3. 3. The cell of claim 2, wherein the fluid injection slot comprises a main body structure and a vent structure, the vent structure comprising a horizontal plate and a vertical plate connected to each other, the horizontal plate being perpendicular to the thickness direction, the vertical plate being perpendicular to the length direction; The side wall of the main body structure is provided with an L-shaped notch, the L-shaped notch is arranged facing the cover plate body, the exhaust structure is embedded in the L-shaped notch, and the outer peripheral surface of the exhaust structure is connected with the wall surface of the L-shaped notch to form the exhaust groove; The vertical plate is attached to the cover plate body, a distance exists between the horizontal plate and the cover plate body, and the exhaust holes are formed in the horizontal plate.
  4. 4. The cell of claim 3, wherein the first molding further comprises a stiffener; the side wall of the main body structure includes two first connection walls opposing each other in the width direction and a second connection wall in the length direction, the L-shaped notch being formed at one side of the two first connection walls and the second connection wall facing the cover plate body; one end of the reinforcing rib is connected with the bottom wall and the second connecting wall, and the other end of the reinforcing rib extends to the vertical plate and is connected with the vertical plate.
  5. 5. The cell of claim 3, wherein the number of the vent holes is plural, and the plurality of vent holes are arranged at intervals in the width direction.
  6. 6. The cell of claim 5, wherein the cover plate satisfies S1/S2 not less than 0.5, wherein S1 is the sum of cross-sectional areas of the plurality of exhaust holes, and S2 is the cross-sectional area of the liquid injection hole, and wherein the cross-sectional intercept direction is perpendicular to the thickness direction.
  7. 7. A cell according to claim 3, wherein the distance h1 of the horizontal plate to the cover plate body in the thickness direction is 0.5mm-1.5mm.
  8. 8. The cell of claim 7, wherein the cover satisfies h-h1>3mm, where h is the distance of the bottom wall from the cover body in the thickness direction.
  9. 9. The cell of any one of claims 1-8, wherein a central region of the bottom wall is disposed opposite the fluid injection holes, the central region of the bottom wall is of a solid structure, the number of fluid injection holes is plural, and the plurality of fluid injection 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 battery manufacturing, 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, an electric core is provided, the electric core comprises a cover plate and a shell, the cover plate is provided with a length direction and a thickness direction which are perpendicular to each other, 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, projection of the first plastic part and the cover plate body is carried out on a plane which is perpendicular to the thickness direction along the thickness direction, the projection profile of the first plastic part completely falls 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 injection groove corresponding to the liquid injection hole, the liquid injection groove is arranged at one end of the first plastic part in the length direction, the bottom wall of the liquid injection groove is provided with a liquid injection guide hole penetrating through the cover plate body, the shell is connected with the part of the cover plate body corresponding to the outer edge of the projection profile of the cover plate body, an exhaust gap is formed between the first plastic part and the liquid injection groove, one side wall of the liquid injection groove is provided with an exhaust gap which is recessed into the liquid injection groove, the side wall in the length direction is arranged at one side of the liquid injection groove, the side of the liquid injection groove is provided with an exhaust hole which is communicated with the exhaust hole, and the exhaust hole is arranged at one side of the exhaust groove which penetrates through the exhaust hole. In any of the above technical solutions, further, the cover plate further has a width direction, the length direction, the width direction, and the thickness direction are perpendicular to each other, and one side of the exhaust groove facing the cover plate body, two sides opposite to each other in the width direction, and one side in the length direction are all open. In any of the above technical solutions, the liquid injection tank further comprises a main body structure and an exhaust structure, the exhaust structure comprises a horizontal plate and a vertical plate which are connected with each oth