CN-122025973-A - Bottom support plate structure and battery core

Abstract

The invention relates to the technical field of batteries, in particular to a bottom support plate structure and an electric core. The bottom support plate structure comprises a plurality of positioning holes which are formed in a bottom support plate main body, wherein at least two positioning holes are arranged on the bottom support plate main body at intervals along a first direction, so that the positioning tool can position the bottom support plate structure and improve the assembly quality of the bottom support plate structure and an insulating film, the distance between the centers of two adjacent positioning holes in the first direction is W, the unit is mm, the size of the bottom support plate main body in the first direction is W0, the unit is mm, and W/W0 is more than or equal to 0.65 and less than or equal to 0.9. The invention can improve the positioning reliability of the bottom support plate structure and ensure the insulation performance, so that the bottom support plate structure and the insulation film are positioned accurately after hot melting, and the coated battery cell can be smoothly put into the shell, thereby improving the yield of the battery cell.

Inventors

• GONG WEIHONG
• MA YONGGUI
• LIU JIE
• ZHOU JIE

Assignees

• 蜂巢能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20260213

Claims (10)

1. 1. A bottom plate structure, comprising: A bottom pallet body; The locating holes are formed in the bottom support plate main body, a plurality of locating holes are formed in the bottom support plate main body, and at least two locating holes are distributed on the bottom support plate main body at intervals along the first direction; in the first direction, the distance between the centers of two adjacent positioning holes is W, the unit is mm, the dimension of the bottom support plate main body in the first direction is W0, the unit is mm, and W/W0 is more than or equal to 0.65 and less than or equal to 0.9.
2. 2. The floor panel structure according to claim 1, wherein the floor panel body is formed as a strip-shaped plate-like structure extending in the second direction, and the first direction, the second direction, and the thickness direction of the floor panel body are arranged two by two perpendicularly.
3. 3. The bottom pallet structure of claim 1 wherein 65mm +.w0 +.580 mm.
4. 4. The floor panel structure of claim 1, wherein at least two of said positioning holes are spaced apart along the second direction on said floor panel body; In the second direction, the distance between the centers of two adjacent positioning holes is L, the unit is mm, the dimension of the bottom support plate main body in the second direction is L0, the unit is mm, and L/L0 is more than or equal to 0.7 and less than or equal to 0.95.
5. 5. The floor panel structure of claim 4, wherein 12mm < L0 < 80mm.
6. 6. The bottom plate structure according to claim 1, wherein a positioning needle on a positioning tool can be inserted into the positioning hole, and the shape of the positioning hole is the same as the shape of a cross section of the positioning needle perpendicular to the direction in which the positioning needle is inserted into the positioning hole.
7. 7. The floor panel structure of claim 1, wherein a projected area of each of the positioning holes on a plane parallel to the floor panel body is S,4mm 2 ≤S≤80mm 2 .
8. 8. The bottom plate structure according to claim 1, wherein the bottom plate body is formed in a rectangular plate-like structure, the positioning holes are provided in four, and the four positioning holes are provided in four corners of the bottom plate body, respectively.
9. 9. The bottom plate structure according to claim 1, wherein the bottom plate body is provided with a diversion hole, the diversion hole is arranged in the middle of the bottom plate body, and a plurality of positioning holes are arranged around the area provided with the diversion hole.
10. 10. A cell comprising the base plate structure of any one of claims 1 to 9.

Description

Bottom support plate structure and battery core Technical Field The invention relates to the technical field of batteries, in particular to a bottom support plate structure and an electric core. Background The lithium ion battery has the advantages of large capacity, high working voltage, strong charge holding capacity, long cycle life and the like, and is widely applied to various fields such as traffic power supply, electric energy storage power supply, new energy storage power supply, aerospace military industry and the like. In square battery core, the top of utmost point group draws the utmost point ear of being connected with the utmost point post on the apron, and the circumference lateral wall and the bottom cladding of utmost point group have the insulating film, and the collet setting is in the bottom one side of utmost point group for the contact of isolated battery inside utmost point group and casing. The bottom support plate and the insulating film in the conventional square battery cell are difficult to assemble and position, and the deviation of the position of the bottom support plate after coating can influence the entering of the shell, so that the yield of the battery cell is reduced. Disclosure of Invention Therefore, the application aims to provide a bottom support plate structure and a battery cell, so as to solve the problems that the bottom support plate and an insulating film in the battery cell are difficult to assemble and position, the deviation of the positions of a coated post-electrode group and the bottom support plate can influence the entering of a shell, and the yield of the battery cell is reduced. The first aspect of the present invention provides a bottom plate structure, which comprises: A bottom pallet body; The locating holes are formed in the bottom support plate main body, a plurality of locating holes are formed in the bottom support plate main body, and at least two locating holes are distributed on the bottom support plate main body at intervals along the first direction; in the first direction, the distance between the centers of two adjacent positioning holes is W, the unit is mm, the dimension of the bottom support plate main body in the first direction is W0, the unit is mm, and W/W0 is more than or equal to 0.65 and less than or equal to 0.9. Preferably, the bottom plate body is formed into a bar-shaped plate structure extending in a second direction, and the first direction, the second direction and the thickness direction of the bottom plate body are arranged in a perpendicular manner. Preferably, 65 mm≤W0≤580 mm. Preferably, at least two positioning holes are arranged on the bottom pallet body at intervals along the second direction; In the second direction, the distance between the centers of two adjacent positioning holes is L, the unit is mm, the dimension of the bottom support plate main body in the second direction is L0, the unit is mm, and L/L0 is more than or equal to 0.7 and less than or equal to 0.95. Preferably, 12 mm≤L0≤80 mm. Preferably, a positioning needle on the positioning tool can extend into the positioning hole, and the shape of the positioning hole is the same as the cross-sectional shape of the positioning needle perpendicular to the direction of the positioning needle extending into the positioning hole. Preferably, the projection area of each positioning hole on a plane parallel to the bottom plate main body is S, and is 4mm 2≤S≤80mm2. Preferably, the bottom support plate body is formed into a rectangular plate-shaped structure, and the four positioning holes are formed in four corners of the bottom support plate body. Preferably, the bottom support plate main body is provided with a diversion hole, the diversion hole is arranged at the middle position of the bottom support plate main body, and a plurality of positioning holes are arranged around the area provided with the diversion hole. The second aspect of the invention provides a battery cell, which comprises the bottom support plate structure according to any one of the above technical schemes. Compared with the prior art, the invention has the beneficial effects that: The positioning holes in the bottom support plate structure are formed in the bottom support plate main body, the positioning holes are formed in a plurality of, at least two positioning holes are distributed on the bottom support plate main body at intervals along the first direction, so that the positioning tool can position the bottom support plate structure, the assembly quality of the bottom support plate structure and an insulating film is improved, the distance between the centers of two adjacent positioning holes in the first direction is W, the unit is mm, the size of the bottom support plate main body in the first direction is W0, the unit is mm, W/W0 is not more than 0.65 and not more than 0.9, the positioning reliability of the bottom support plate structure is improved, the insulating performance