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CN-122000414-A - Battery core and electricity utilization device

CN122000414ACN 122000414 ACN122000414 ACN 122000414ACN-122000414-A

Abstract

The application relates to the technical field of batteries, in particular to an electric core and an electric device. The battery cell comprises a cover plate, a shell and a pole group, wherein the cover plate comprises a cover plate body and a first plastic part, the liquid injection part comprises a surrounding wall and a bottom wall, the bottom wall and the cover plate are arranged at intervals along the length direction and are opposite to each other, the surrounding wall surrounds the bottom wall for at least one circle to enclose and form a liquid injection groove which is open to the liquid injection hole, an air passing gap is formed between one end, far away from the insulating body, of the liquid injection part in the width direction and the shell, and the liquid injection part further comprises an air passing channel penetrating through the surrounding wall to form a side air outlet at the surrounding wall, and the side air outlet is connected with the liquid injection groove and the air passing gap. The application solves the problems that in the existing battery cell structure, an electrolyte diversion hole is arranged below the plastic under the cover plate and is used as an exhaust hole to guide the gas inside the battery cell to the outside, but the insulating adhesive tape on the surface of the pole group and the exhaust hole 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, a shell and a pole group, wherein the battery cell is provided with a length direction and a width direction which are perpendicular to each other, and the cover plate is covered on one side of the shell in the length direction so as to enclose an accommodating space for accommodating the pole group; the cover plate comprises a cover plate body and a first plastic part, wherein the first plastic part is arranged in the shell and is fixed on one side of the cover plate body in the length direction; One end of the cover plate body in the width direction is provided with a liquid injection hole penetrating through the cover plate body, the first plastic part comprises an insulating body and a liquid injection part which are connected along the width direction, and the liquid injection part is opposite to the liquid injection hole; The liquid injection part comprises a surrounding wall and a bottom wall, the bottom wall and the cover plate are arranged at intervals along the length direction and are opposite to each other, and the surrounding wall is arranged around the bottom wall for at least one circle so as to form a liquid injection groove which is open and faces the liquid injection hole in a surrounding manner; the liquid injection part is characterized in that an air passing gap is formed between one end, far away from the insulating body, of the liquid injection part in the width direction and the shell, and the liquid injection part further comprises an air passing channel penetrating through the surrounding wall so as to form a side air outlet on the surrounding wall, and the side air outlet is connected with the liquid injection groove and the air passing gap.
  2. 2. The cell according to claim 1, wherein the gas passing passage is provided at an end of the liquid injection portion in the width direction away from the insulating body.
  3. 3. The cell of claim 2, wherein the gas passage bisects the enclosure wall into two sections.
  4. 4. The cell of claim 3, further comprising a thickness direction perpendicular to a plane defined by both the length direction and the width direction; the gas passing channel is arranged in the middle of the liquid injection part in the thickness direction.
  5. 5. The cell of claim 1, wherein the gas passage extends through the bottom wall along the length direction to form a liquid passage; The liquid passing port is communicated with the side exhaust port.
  6. 6. The cell of claim 5, wherein in the width direction, the fluid passing openings are offset from the fluid injection holes; And/or the liquid passing port is opened at one end of the bottom wall, which is far away from the insulating body in the width direction, and is aligned with the side air exhaust port.
  7. 7. The cell of claim 1, wherein the cell comprises a plurality of conductive traces, In the width direction, the size of the liquid injection part is N, and the size of the gas passing channel is N; The battery cell also has a thickness direction, the thickness direction is perpendicular to a plane determined by the length direction and the width direction, in the thickness direction, the size of the liquid injection groove is M, and the size of the gas passing channel is M; Wherein, the content of the active ingredients is less than or equal to 0.25 percent Less than or equal to 0.5 and/or less than or equal to 0.15 ≤0.25。
  8. 8. The cell of claim 3, further comprising a thickness direction perpendicular to a plane defined by both the length direction and the width direction; The enclosing wall comprises an inclined enclosing block, a first straight enclosing block and two second straight enclosing blocks, the second straight enclosing blocks extend along the width direction, the first straight enclosing blocks and the inclined enclosing blocks are opposite to each other along the width direction and are arranged at intervals, the first straight enclosing blocks and the inclined enclosing blocks are respectively connected with two ends of the second straight enclosing blocks, and the first straight enclosing blocks are sequentially cut into a first section and a second section by the air passage; The liquid injection part further comprises two guide fences, the two guide fences are spaced in the thickness direction and are opposite to each other, the guide fences are provided with first ends and second ends which are opposite to each other in the width direction, the first ends of the two guide fences are connected with the inclined fences, one of the two guide fences is connected with one end of the first section, which is close to the second section, and the other guide fence is connected with one end of the second section, which is close to the first section; And observing along the length direction, wherein the liquid injection hole is positioned between the two diversion barriers.
  9. 9. The cell of claim 8, wherein the cell comprises a plurality of conductive traces, The two diversion barriers are symmetrically arranged about the central line of the first plastic part in the thickness direction; And/or, the water conservancy diversion encloses keeps off including following first straight section, dilatation section and the straight section of second that width direction connects gradually, first straight section with the straight section of second is all followed width direction extends, the dilatation section perpendicular to length direction's transversal arc of personally submitting, the arc parcel in annotate the outside of liquid hole.
  10. 10. An electrical device comprising a cell according to any one of claims 1-9.

Description

Battery core and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to an electric core and an electric device. 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 process, the conventional cell structure generally uses an electrolyte diversion hole arranged below the plastic under the cover plate as an exhaust hole, so as to guide the gas inside the cell to the outside, and avoid pressure rise caused by accumulation of the gas inside the cell. However, during the assembly of the battery cells, the surfaces of the pole groups are typically covered with an insulating tape. However, the electrode group adhesive tape is prone to position deviation, wrinkling or excessive cladding, so that physical interference is formed between the adhesive tape and an electrolyte diversion hole arranged below the cover plate, and 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 an electric device, 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 the conventional 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 a first aspect of the present application, there is provided a battery cell including a cover plate, a case, and a pole group, the battery cell having a length direction and a width direction perpendicular to each other, the cover plate being covered on one side of the case in the length direction to enclose an accommodating space for accommodating the pole group; the cover plate comprises a cover plate body and a first plastic part, wherein the first plastic part is arranged in the shell and is fixed on one side of the cover plate body in the length direction; One end of the cover plate body in the width direction is provided with a liquid injection hole penetrating through the cover plate body, the first plastic part comprises an insulating body and a liquid injection part which are connected along the width direction, and the liquid injection part is opposite to the liquid injection hole; The liquid injection part comprises a surrounding wall and a bottom wall, the bottom wall and the cover plate are arranged at intervals along the length direction and are opposite to each other, and the surrounding wall is arranged around the bottom wall for at least one circle so as to form a liquid injection groove which is open and faces the liquid injection hole in a surrounding manner; the liquid injection part is characterized in that an air passing gap is formed between one end, far away from the insulating body, of the liquid injection part in the width direction and the shell, and the liquid injection part further comprises an air passing channel penetrating through the surrounding wall so as to form a side air outlet on the surrounding wall, and the side air outlet is connected with the liquid injection groove and the air passing gap. In any of the above-described aspects, further, the gas passing passage is provided at an end of the liquid injection portion in the width direction, which is away from the insulating body. In any of the above technical solutions, further, the gas passing channel cuts the enclosure wall into two sections. In any of the above technical solutions, further, the battery cell further has a thickness direction, and the thickness direction is perpendicular to a plane defined by both the length direction and the width direction; the gas passing channel is arranged in the middle of the liquid injection part in the thickness direction. In any of the above technical solutions, further, the gas passing channel penetrates through the bottom wall along the length direction to form a liquid passing