Full-tab positive collector plate

Abstract

A through groove communicated with the upper end face and the lower end face is formed in a disc body in the radial direction, the through groove is in central symmetry, the length of the through groove in the radial direction is not smaller than the radius of the disc body, the front side and the rear side of the through groove are vertically and upwards connected with a first connecting piece and a second connecting piece respectively, and the first connecting piece is higher than the second connecting piece. A liquid injection hole is formed in the lower portion of the second connecting piece, the distance between the high point of the liquid injection hole and the disc body is larger than the distance between the rear side of the through groove and the connecting position of the second connecting piece on the disc body, and the distance between the low point of the liquid injection hole and the disc body is smaller than the distance between the front side of the through groove and the connecting position of the second connecting piece on the disc body. The structure is simple, the diversion and heat conduction area of the positive tab is effectively increased, and the internal resistance and discharge temperature rise of the battery are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery structure, specifically is a full tab positive current collecting disc. BACKGROUND

[0002] In recent years, cylindrical batteries are driven by the increasing terminal demand, and the product performance and application range are continuously improved, and the battery core is required to have higher charge and discharge power, and full tab and multi-tab cylindrical batteries emerge as the times require. Full tab or multi-tab technology can reduce the battery internal resistance and heating rate by orders of magnitude, and has absolute advantages in solving the heat dissipation problem of high energy density battery core. However, when the large current is charged and discharged, the connecting sheet between the positive current collecting disc and the cover cap is limited in the flow area, and the temperature rise is obviously higher than that of the middle and bottom of the battery, which also limits the larger charge and discharge rate of the full tab battery. Although the thickness of the current collecting disc can improve the flow capacity, it also increases the difficulty of bending and welding of the connecting sheet. SUMMARY

[0003] The utility model provides a full tab positive current collecting disc which is simple in structure, effectively increases the flow and heat conduction area of the positive tab, and reduces the battery internal resistance and discharge temperature rise.

[0004] The technical scheme adopted by the utility model is as follows: a full tab positive current collecting disc, comprising a disc body, characterized in that: a through groove is formed on the disc body along the radial direction and communicates with the upper and lower end faces, the through groove is symmetric about the center and the length in the radial direction is not less than the radius of the disc body, the front and rear sides of the through groove are respectively connected with first and second connecting sheets vertically upward, the height of the first connecting sheet is higher than that of the second connecting sheet, a liquid injection hole is formed in the lower part of the second connecting sheet, the distance between the high point of the liquid injection hole and the disc body is greater than the distance between the rear side of the through groove and the connecting part of the second connecting sheet on the disc body, and the distance between the low point of the liquid injection hole and the disc body is less than the distance between the front side of the through groove and the connecting part of the second connecting sheet on the disc body.

[0005] The first and second connecting sheets are connected on the front and rear side walls of the through groove, or connected on the mouth parts of the front and rear of the through groove.

[0006] The diameter of the liquid injection hole is equal to the distance between the inner side surfaces of the first and second connecting sheets, or the width of the front and rear sides of the through groove.

[0007] The length of the first and second connecting sheets in the direction of the through groove is not less than the length of the through groove

[0008] The height of the first connecting sheet is 3mm higher than that of the second connecting sheet.

[0009] The first and second connecting sheets are ultrasonic wave butt welded in the height direction.

[0010] The first connecting sheet is welded with the cover cap at the position above the butt welding on the side facing the second connecting sheet.

[0011] Compared with the prior art, the cylinder battery has the advantages that the first and second connecting pieces are connected at the upper end, the flow and heat conduction area of the positive side is increased, the electrolyte permeation is ensured through the injection hole and the corresponding through groove, the internal resistance of the cylinder battery is reduced, the voltage platform of large current discharge is effectively improved, and the temperature rise of the cylinder battery is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model;

[0013] Figure 2 It is a top view. Figure 1

[0014] In the drawing: disc body 1, through groove 2, first pole piece 3, second pole piece 4, welding area 5, injection hole 6. DETAILED DESCRIPTION

[0015] Further description is made below in combination with the drawings.

[0016] Figure 1 、 2 As shown in the figure: a full tab positive electrode current collecting disc, comprising disc body 1, first pole piece 3 and second pole piece 4. The disc body 1 is provided with a through groove 2 connecting the upper and lower end faces along the diameter, the length of the through groove 2 in the radial direction is not less than the radius of the disc body 1, the front and rear inner walls of the through groove 2 are respectively connected to the first and second connecting pieces 3 and 4 vertically upward, the height of the first connecting piece 4 is higher than that of the second connecting piece 4, the high part is the welding area 5, the injection hole 6 is arranged in the lower part of the second connecting piece 4, the low point of the injection hole 6 is in the same plane as the upper end face of the disc body 1, and the diameter of the injection hole 6 is equal to the front and rear distance of the first and second connecting pieces 3 and 4 in the through groove 2.

[0017] In the use of the current collecting disc, the first and second connecting pieces 3 and 4 are ultrasonically welded at the upper end, the side surface part of the first connecting piece 3 which is higher than the second connecting piece 4 and faces the second connecting piece 4 is the welding area 5, the first and second connecting pieces 3 and 4 after welding increase the flow and heat conduction area of the connecting piece connected with the cap; the first and second connecting pieces 3 and 4 after welding are pressed and folded towards the side of the first connecting piece, the welding area 5 is welded with the cap, and the combination of the injection hole 6 and the through groove 1 can make the electrolyte injection performance better, the electrolyte permeation speed and fullness of the battery cell are considered, the battery production efficiency is ensured, and the temperature rise of the positive side is reduced.​

Claims

1. A full-tab positive current collector disk, comprising a disk body, characterized in that: A through groove is formed radially on the disc body, connecting the upper and lower end faces. The through groove is symmetrical in the center and its radial length is not less than the radius of the disc body. The front and rear sides of the through groove are vertically connected to the first and second connecting pieces, respectively. The height of the first connecting piece is higher than that of the second connecting piece. An injection hole is formed at the lower part of the second connecting piece. The distance between the high point of the injection hole and the disc body is greater than the distance between the rear side of the through groove and the second connecting piece at the connection point of the disc body. The distance between the low point of the injection hole and the disc body is less than the distance between the front side of the through groove and the second connecting piece at the connection point of the disc body.

2. The all-hole positive current collector according to claim 1, characterized in that: The first and second connecting pieces are connected to the front and rear side walls of the through groove, or to the front and rear openings of the through groove.

3. A positive current collector with a full-pole tab according to claim 1 or 2, characterized in that: The diameter of the injection hole is equal to the distance between the inner sides of the first and second connecting pieces, or the width of the front and rear sides of the through groove.

4. A full-tab positive current collector according to claim 1 or 2, characterized in that: The lengths of the first and second connecting pieces along the through groove direction are not less than the length of the through groove.

5. A full-tab positive current collector according to claim 1 or 2, characterized in that: The first connecting piece is 3mm higher than the second connecting piece.

6. A full-tab positive current collector according to claim 1 or 2, characterized in that: The first and second connecting pieces are ultrasonically welded at their upper ends in the height direction.

7. A positive current collector with a full-tab according to claim 6, characterized in that: The first connecting piece is welded to the cap at the position above the weld on the side facing the second connecting piece.

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