CN-122000413-A - Battery core and electric equipment

CN122000413ACN 122000413 ACN122000413 ACN 122000413ACN-122000413-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 pole group, 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 facing the pole group, the outer edge of the first plastic part is arranged on the inner side of the outer edge 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 first bottom wall of the liquid injection groove is provided with a liquid injection diversion hole penetrating through the cover plate body, the shell is connected with the outer edge of the cover plate body, an exhaust gap is reserved between the shell and the first plastic part, the side wall of the liquid injection groove facing the shell is provided with an exhaust hole penetrating through the cover plate body, and the exhaust hole is communicated with the exhaust gap. The application solves the problems that in the existing battery cell structure, the 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.

Inventors

LI ZHAOHUA
ZHOU JIE
ZHU YAQING
XU YADONG

Assignees

蜂巢能源科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260311

Claims (10)

1. The battery cell is characterized by comprising a pole group, a cover plate and a shell, wherein the cover plate has a thickness direction, and comprises a cover plate body and a first plastic part which are connected with each other in the thickness direction; The first plastic part is connected with one side of the cover plate body facing the pole group, and projects the first plastic part and the cover plate body along the thickness direction to a plane perpendicular to the thickness direction, wherein 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, and a first bottom wall of the liquid injection groove is provided with a liquid injection guide hole penetrating through the cover plate body; The casing with the apron body corresponds its projection profile outer fringe's position connection, and with there is the exhaust clearance between the first plastic part, annotate the cistern facing the lateral wall of casing and offered the exhaust hole that runs through oneself, the exhaust hole with the exhaust clearance intercommunication.
2. The cell according to claim 1, wherein a side wall of the liquid injection groove facing the housing is provided with a positioning groove protruding toward the inside of the liquid injection groove, the positioning groove including a second bottom wall provided facing the pole group and a surrounding wall provided around the second bottom wall; the surrounding wall is in contact with one side of the cover plate body facing the pole group, an opening is formed in one side of the surrounding wall facing the shell, and the second bottom wall is provided with the exhaust hole penetrating through the second bottom wall; One side of the cover plate body facing the pole group is provided with a positioning protrusion protruding towards the pole group, a space is arranged between the positioning protrusion and the second bottom wall, and the positioning protrusion is matched with the surrounding wall in a positioning manner.
3. The cell of claim 2, wherein the cover plate further has a length direction, the length direction being perpendicular to the thickness direction; the liquid injection hole is arranged at the end part of the cover plate body in the length direction, the liquid injection groove is arranged at the end part of the first plastic part in the length direction, and the positioning groove is arranged on the side wall of the liquid injection groove in the length direction; The one side of the surrounding wall in the length direction is provided with the opening.
4. The cell of claim 3, 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 positioning protrusion is a rectangular protrusion, the positioning groove is a rectangular groove, the surrounding wall comprises a first positioning wall and two second positioning walls, the first positioning wall is opposite to the opening, the two second positioning walls are opposite to each other in the width direction, and the positioning protrusion is matched with the first positioning wall and the two second positioning walls in a positioning mode.
5. The cell according to claim 3, wherein the cover body includes a first step portion and a second step portion connected to each other in the thickness direction, a cross-sectional area of the second step portion perpendicular to the thickness direction being smaller than a cross-sectional area of the first step portion perpendicular to the thickness direction; The step surface formed at the joint of the second step part and the first step part is used for mounting the shell, the surrounding wall is contacted with one side of the second step part facing the pole group, and the positioning bulge is arranged on one side of the second step part facing the pole group.
6. A cell according to claim 3, wherein a central region of the first bottom wall of the liquid injection groove is opposite to the liquid injection hole, the central region of the first bottom wall is of a solid structure, the number of the liquid injection diversion holes is plural, and the plural liquid injection diversion holes are arranged along a circumferential direction of the solid structure.
7. The cell of any one of claims 2-6, wherein a spacing between the positioning protrusion and the second bottom wall satisfies d≤1.5 mm, d being a distance between the positioning protrusion and the second bottom wall in the thickness direction.
8. The cell of any one of claims 2-6, wherein a spacing between the positioning protrusion and the second bottom wall satisfies that d is greater than or equal to 0.5mm, d being a distance between the positioning protrusion and the second bottom wall in the thickness direction.
9. The cell of any one of claims 3-6, wherein the cover plate body comprises a liquid injection hole processing portion provided with the liquid injection hole penetrating through the cover plate body; the positioning protrusions and the liquid injection hole processing part are arranged at intervals along the length direction; The distance between the positioning protrusion and the liquid injection hole processing part is more than or equal to 3mm, and L is the distance between the positioning protrusion and the liquid injection hole processing part in the length direction.
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 procedures, the existing cell structure is generally provided with an electrolyte diversion hole below the plastic under the cover plate as an exhaust hole to guide 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 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 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 battery cell comprises a pole group, a cover plate 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, which faces the pole group, and is projected to a plane perpendicular to the thickness direction along the thickness direction, the projection profile of the first plastic part completely falls in 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 first bottom wall of the liquid injection groove is provided with a liquid injection guide hole penetrating through the first plastic part, the shell is connected with the part, which corresponds to the outer edge of the projection profile of the cover plate body, an exhaust gap is reserved between the first plastic part, the side wall of the liquid injection groove, which faces the shell, is provided with an exhaust hole penetrating through the cover plate body, and the exhaust hole is communicated with the exhaust gap. In any of the above technical solutions, further, a positioning groove protruding towards the inside of the liquid injection groove is formed in the side wall of the liquid injection groove facing the shell, the positioning groove comprises a second bottom wall facing the pole group and a surrounding wall surrounding the second bottom wall, the surrounding wall is in contact with one side of the cover plate body facing the pole group, an opening is formed in one side of the surrounding wall facing the shell, the second bottom wall is provided with an exhaust hole penetrating through the second bottom wall, a positioning protrusion protruding towards the pole group is formed in one side of the cover plate body facing the pole group, a space is formed between the positioning protrusion and the second bottom wall, and the positioning protrusion is in positioning fit with the surrounding wall. In any of the above technical solutions, the cover plate further has a length direction, the length direction is perpendicular to the thickness direction, the liquid injection hole is disposed at an end portion of the cover plate body in the length direction, the liquid injection groove is disposed at an end portion of the first plastic part in the length direction, the positioning groove