CN-224232870-U - Battery cell, battery device and electricity utilization device

CN224232870UCN 224232870 UCN224232870 UCN 224232870UCN-224232870-U

Abstract

The utility model discloses a battery cell, a battery device and an electric device, wherein the battery cell comprises a shell component, a battery core component, an insulating film and a buffer layer, a containing cavity is formed in the shell component, the battery core component is arranged in the containing cavity, the battery core component comprises a battery core body, the battery core body comprises a plurality of anode pole piece layers and a plurality of cathode pole piece layers, the buffer layer is arranged in the containing cavity and comprises at least one first buffer part and at least one second buffer part, the first buffer part extends to be long in a first direction, the second buffer part extends to be long in a second direction, the first buffer part and the second buffer part are intersected, and the first direction and the second direction are perpendicular to the thickness direction of the shell component. Therefore, the buffer layer can be used for supporting the battery cell assembly, and can provide certain resistance to the expansion of the battery cell body so that the pole piece is not easy to wrinkle.

Inventors

DU XIANGLONG
GAO KAI
LI YONGKUN
LAI YOULEI
JIN HAIZU

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250325

Claims (14)

1. A battery cell, comprising: A housing assembly having a receiving cavity therein; The battery cell assembly is arranged in the accommodating cavity and comprises a battery cell body, wherein the battery cell body comprises a plurality of anode pole piece layers and a plurality of cathode pole piece layers, and the anode pole piece layers and the cathode pole piece layers are alternately arranged one by one along the thickness direction of the shell assembly; the insulating film is arranged in the accommodating cavity and coats the battery cell body; The buffer layer is arranged in the accommodating cavity and comprises at least one first buffer part and at least one second buffer part, the first buffer part extends to be long-strip-shaped along a first direction, the second buffer part extends to be long-strip-shaped along a second direction, the first buffer part and the second buffer part are intersected and arranged, the first direction and the second direction are perpendicular to the thickness direction of the shell component, Wherein the buffer layer is respectively clamped between the opposite sides of the battery core body and the insulating film in the thickness direction of the shell component, and/or, And the buffer layers are respectively clamped between the opposite sides of the insulating film and the shell component in the thickness direction of the shell component.
2. The battery cell of claim 1, wherein the first buffer portions and the second buffer portions are respectively plural, the first buffer portions are disposed at intervals along the second direction, the second buffer portions are disposed at intervals along the first direction, each first buffer portion respectively intersects all of the second buffer portions, each second buffer portion respectively intersects all of the first buffer portions, the first direction is a height direction of the housing assembly, and the second direction is a length direction of the housing assembly.
3. The battery cell of claim 2, wherein two of the first buffer portions and two of the second buffer portions are connected in sequence end to form a square ring structure.
4. The battery cell of claim 1, wherein the first buffer has a width t1 in the second direction, and the second buffer has a width t2 in the first direction of 20mm +.t1 +.60 mm,20mm +.t2 +.60 mm.
5. The battery cell of claim 1, wherein one of the housing assembly, the cell assembly, and the insulating film is adhesively secured to the buffer layer.
6. The battery cell as defined in claim 1, wherein the case assembly includes a case body having one end thereof open in a height direction of the case assembly and a case cover provided at the open end of the case body to define a receiving chamber, the battery cell assembly further includes a conductive portion connecting the battery cell body and the battery cell post, a center of the buffer layer is offset from a center of the case body in a direction away from the conductive portion in the height direction of the case assembly, The battery cell is configured to satisfy at least one of the following conditions, The dimension of the shell body in the height direction of the shell assembly is L1, the dimension of the buffer layer in the height direction of the shell assembly is L2, and L2/L1 is more than or equal to 0.9 and less than or equal to 0.98; the dimension of the battery cell body in the height direction of the shell assembly is L3, and the dimension of the buffer layer in the height direction of the shell assembly is L2, wherein L2/L3 is more than or equal to 1.02 and less than or equal to 1.1; the distance between one end of the buffer layer, which faces the shell cover, and the shell cover is t3, and t3 is more than or equal to 1mm and less than or equal to 3mm; the length of the shell component is greater than the thickness of the shell component, and the distance between the buffer layer and the shell body in the length direction of the shell component is t4, and t4 is more than or equal to 5mm and less than or equal to 15mm.
7. The battery cell of claim 1, wherein the buffer layer is a imbibed swellable polymer layer configured to satisfy at least one of the following conditions: The thickness of the polymer layer in the thickness direction of the shell component is d1, and the distance between two opposite inner wall surfaces of the shell component in the thickness direction is d2, d1=0.002×d2; the thickness of the polymer layer in the thickness direction of the shell component is d1, d1 is more than or equal to 20 mu m and less than or equal to 100 mu m; the swelling thickness growth coefficient of the polymer layer is m, and m is more than or equal to 8 and less than or equal to 20.
8. The battery cell according to any one of claims 1-7, wherein, The battery core body is of a winding type structure, the peripheral wall of the battery core body comprises a straight area and an arc area connected with the straight area, the two arc areas are oppositely arranged along the length direction of the shell component, the buffer layer is opposite to the straight area and staggered with the arc area, or The battery cell body is of a laminated structure.
9. The battery cell according to claim 8, wherein the buffer layer has a dimension L4 in the longitudinal direction of the case assembly, and the distance between the two inner wall surfaces of the case assembly disposed opposite to each other in the longitudinal direction is L5, 0.85≤l4/L5≤0.95.
10. The battery cell according to claim 8, wherein the plurality of cell bodies are sequentially arranged along the thickness direction of the housing assembly, the insulating film covers all the cell bodies, and the buffer layers are respectively arranged on outermost sides of the plurality of cell bodies in the thickness direction of the housing assembly.
11. The battery cell of claim 10, wherein the buffer layer is disposed between two adjacent cell bodies.
12. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The peripheral wall of the battery cell body is a cylindrical surface, and the buffer layer is sleeved outside the battery cell body.
13. A battery device comprising a battery cell according to any one of claims 1-12.
14. An electrical device comprising a battery cell according to any one of claims 1-12 or a battery device according to claim 13.

Description

Battery cell, battery device and electricity utilization device Technical Field The utility model relates to the technical field of batteries, in particular to a battery cell, a battery device and an electric device. Background In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, battery devices play an important role as power sources of electric automobiles. Wherein, the battery monomer is in the in-process that uses, and the battery monomer needs continuous charging and discharging, takes place the inflation deformation of electric core body easily, and then leads to the pole piece to appear wrinkling problem, influences the free life of battery. Disclosure of utility model The application provides a battery monomer, a battery device and an electricity utilization device, wherein a buffer layer can be used for supporting a battery core body and can provide a certain resistance to the expansion of the battery core body so as to prevent a pole piece from wrinkling. In a first aspect, an embodiment of the application provides a battery monomer, which comprises a shell component, a battery cell component, an insulating film and a buffer layer, wherein a containing cavity is formed in the shell component, the battery cell component is arranged in the containing cavity, the battery cell component comprises a battery cell body, the battery cell body comprises a plurality of anode pole piece layers and a plurality of cathode pole piece layers, the plurality of anode pole piece layers and the plurality of cathode pole piece layers are alternately arranged one by one along the thickness direction of the shell component, the insulating film is arranged in the containing cavity and coats the battery cell body, the buffer layer is arranged in the containing cavity, the buffer layer comprises at least one first buffer part and at least one second buffer part, the first buffer part extends to be long in the first direction, the second buffer part extends to be long in the second direction, the first buffer part and the second buffer part are arranged in an intersecting way, the first direction and the second direction are perpendicular to the thickness direction of the shell component, the buffer layers are respectively clamped between two opposite sides of the battery cell body and the insulating film in the thickness direction of the shell component, and/or the buffer layer is respectively clamped between two opposite sides of the insulating film and the shell component in the thickness direction. Among the above-mentioned technical scheme, electric core body and buffer layer all are located and hold the chamber, the buffer layer can be used to support electric core body, when the battery monomer is in continuous charge and discharge in-process, the electric core body takes place the inflation deformation easily, the buffer layer can provide certain resistance to electric core body inflation, promptly the buffer layer can provide a constraint power to electric core monomer, so that the pole piece is difficult for taking place to beat the wrinkle problem, so as to reduce the possibility that lithium problem appears in the battery monomer, be favorable to improving the free life of battery, and above-mentioned buffer layer is including crossing first buffer portion and the second buffer portion that sets up, first buffer portion and the at least partial region of second buffer portion do not overlap, so that the holding range of first buffer portion and second buffer portion is bigger, be difficult for producing the inhomogeneous condition of electric core body atress, be convenient for improving the free reliability of battery. In some embodiments, the first buffer portions and the second buffer portions are respectively plural, the plural first buffer portions are disposed at intervals along the second direction, the plural second buffer portions are disposed at intervals along the first direction, each first buffer portion is respectively intersected with all the second buffer portions, each second buffer portion is respectively intersected with all the first buffer portions, the first direction is a height direction of the housing assembly, and the second direction is a length direction of the housing assembly. In the above technical scheme, the supporting area of the buffer layer can be increased by the first buffer parts and the second buffer parts so as to improve the binding force of the buffer layer to the battery cell body, each first buffer part is intersected with all the second buffer parts, and each second buffer part is intersected with all the first buffer parts, so that the first buffer parts and the second buffer parts can be approximately formed into a net structure, acting force borne by the buffer layer can be better dispersed, and the service life of the buffer layer is prolonged. In some embodiments, the two first buffer portions and t