CN-224232679-U - Soft packet of electric core with pressure release structure

CN224232679UCN 224232679 UCN224232679 UCN 224232679UCN-224232679-U

Abstract

The utility model provides a soft package battery core with a pressure relief structure, which relates to the technical field of batteries, wherein a groove is formed in the surface of the shell, a bare battery core is arranged in the groove, a plurality of pressure relief structures are arranged outside the groove, the shell is divided into a left part and a right part along a central line and is respectively provided with a containing part and a covering part, the groove is formed in the containing part, the surface of the containing part is positioned at the periphery of the groove and is provided with a sticky region, the covering part is covered on the containing part and is fixed with the sticky region in a thermoplastic mode, aluminum sheets corresponding to the groove are arranged on the surface of the covering part and are in contact with the bare battery core, the number of the grooves is one or two, the pressure relief effect is achieved on the side surface of the soft package battery core in the explosion-proof region, after the pressure relief of the explosion-proof region, the situation that the upper end surface and the lower end surfaces of the soft package battery core are not swelled or exploded is avoided, and the safety performance of a module is greatly improved after the battery core is assembled.

Inventors

HUANG XIAOWEI
ZHOU WEI
HU YANLAN
CHEN JINLONG

Assignees

江西赣锋锂电科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250428

Claims (7)

1. The utility model provides a soft packet of electric core with pressure release structure which characterized in that includes: the shell is provided with a groove on the surface, a bare cell is arranged in the groove, and a plurality of pressure relief structures are arranged outside the groove; The shell is divided into a left part and a right part along the central line, the left part and the right part are respectively a containing part and a covering part, the groove is formed in the containing part, the surface of the containing part is provided with an adhesive area which is positioned at the periphery of the groove, the covering part is covered on the containing part and is fixed with the adhesive area in a thermoplastic mode, the surface of the covering part is provided with an aluminum sheet corresponding to the groove, and the aluminum sheet is in contact with the bare cell.
2. The soft package battery core with the pressure relief structure as claimed in claim 1, wherein the number of the grooves is one or two; When the number of the grooves is two, the grooves are symmetrically distributed on the surface of the shell, and the shell is folded along the central line, and the two grooves are combined to form a containing cavity.
3. The soft package battery core with the pressure release structure of claim 1, wherein the surface of the adhesion area is provided with a rough part with the width of not less than 0.3mm at the periphery of the groove, and a plurality of pits are formed on the surface of the rough part.
4. The soft package cell with the pressure relief structure of claim 1, wherein the thickness of the aluminum sheet is 10-100 μm, and the area of the aluminum sheet is less than or equal to the area of the groove.
5. The soft package battery cell with the pressure relief structure according to claim 1, wherein the pressure relief structure comprises an explosion-proof area and a patch; The explosion-proof area is positioned on the side wall of the groove, is a weak position of the shell, and is smaller than other positions in the shell.
6. The soft package battery cell with the pressure relief structure as set forth in claim 5, wherein the outer surface of the explosion-proof area is provided with a circle of frosted area, the frosted area is a rough surface, the patch is fixed with the frosted area, and the patch covers the outer surface of the explosion-proof area.
7. The flexible battery cell with the pressure release structure of claim 6, wherein the surface of the patch is provided with a non-penetrating notch.

Description

Soft packet of electric core with pressure release structure Technical Field The utility model relates to the technical field of batteries, in particular to a soft package battery core with a pressure relief structure. Background The lithium ion battery is used as an energy storage device which is favored, mainly comprises an anode, a cathode, electrolyte and a diaphragm, has higher energy density than the traditional lead-acid and nickel-hydrogen batteries, and has the advantages of small volume, long cycle life, high manufacturability and the like. According to the packaging forms of lithium ion batteries, the lithium ion batteries are mainly divided into three types of cylinders, square hard shells and soft packages. The hard shell battery cell has the advantages of relatively simple grouping structure, more convenient setting of the explosion-proof valve and better heat dissipation, so the hard shell battery cell is more frequently used as a power battery cell, but the energy density of the hard shell battery cell is relatively higher than that of a soft package battery cell, the weight of the hard shell battery cell is heavier, and the space utilization rate in grouping is low. If the soft package battery core with a thinner volume and higher battery core energy density is used as the battery core of the power battery, the defects of difficult heat dissipation design and lack of a pressure release structure of the soft package battery core are faced, particularly, the soft package battery is mutually piled up when being grouped, large end surfaces are mutually clung, one soft package battery core has bulge explosion, firstly, the position of the large end surface is deformed, the adjacent battery core is directly influenced, and the larger danger is caused. This is a technical problem that those skilled in the art are urgent to overcome in soft pack batteries. Disclosure of utility model The utility model aims to solve the technical problems that the soft-package battery core is difficult to radiate and lacks a pressure release structure, the defects can cause the problems of reduced safety performance, explosion initiation and the like of a power battery, and the soft-package battery core with the pressure release structure is provided for solving the problems existing in the prior art. The aim and the effect of the utility model are achieved by the following specific technical means: a soft pack cell with pressure relief structure, comprising: the shell is provided with a groove on the surface, a bare cell is arranged in the groove, and a plurality of pressure relief structures are arranged outside the groove; The shell is divided into a left part and a right part along the central line, the left part and the right part are respectively a containing part and a covering part, the groove is formed in the containing part, the surface of the containing part is provided with an adhesive area which is positioned at the periphery of the groove, the covering part is covered on the containing part and is fixed with the adhesive area in a thermoplastic mode, the surface of the covering part is provided with an aluminum sheet corresponding to the groove, and the aluminum sheet is in contact with the bare cell. Further preferred is that the number of the grooves is one or two; When the number of the grooves is two, the grooves are symmetrically distributed on the surface of the shell, and the shell is folded along the central line, and the two grooves are combined to form a containing cavity. Further preferably, the surface of the adhesive area is provided with a rough part with the width of not less than 0.3mm at the periphery of the groove, and the surface of the rough part is provided with a plurality of pits. Further preferable scheme is that the thickness of the aluminum sheet is 10-100 μm, and the area of the aluminum sheet is less than or equal to the area of the groove. The pressure release structure comprises an explosion-proof area and a patch; The explosion-proof area is positioned on the side wall of the groove, is a weak position of the shell, and is smaller than other positions in the shell. The explosion-proof area is characterized in that a circle of frosted area is arranged on the outer surface of the explosion-proof area, the frosted area is a rough surface, the patch is fixed with the frosted area, and the patch covers the outer surface of the explosion-proof area. Further preferably, the surface of the patch is provided with a non-penetrating notch. The utility model has the beneficial effects that: 1. After the containing part and the covering part are heat-sealed, the aluminum sheet is in contact with the bare cell, the aluminum sheet plays a role in heat dissipation in the battery cell, and because the outer layer of the bare cell is a diaphragm, plastic contact exists between the diaphragm and the aluminum-plastic composite film, heat cannot be effectively led out, the metal aluminum shee