CN216719961U - Novel HJT battery piece series welding structure - Google Patents

Abstract

The utility model discloses a novel series welding structure of HJT battery pieces, wherein the positive electrode of a half battery piece is composed of a positive electrode main grid line and an auxiliary grid perpendicular to the positive electrode main grid line, the negative electrode of the half battery piece is composed of a negative electrode main grid line and a back electric field, two adjacent half battery pieces 1 are connected in series by adopting a welding strip, the lower surface of a first welding part on the welding strip is welded with the negative electrode main grid line on the half battery piece on the left side, the upper surface of a second welding part on the welding strip is welded with the positive electrode main grid line on the half battery piece on the right side, and the series welding structure of the battery pieces can solve the problem of hidden cracks in the welding process, meanwhile, the utility model greatly reduces the consumption of silver paste and welding strips and the cost, the positive electrode and the negative electrode of the battery structure are both composed of a grid, because one grid line is adopted, the consumption of silver paste is greatly reduced, and hidden cracks and fragments caused by welding a plurality of grid lines are reduced.

Description

Novel HJT battery piece series welding structure

Technical Field

The utility model belongs to the technical field of series welding of battery pieces, and particularly relates to a novel series welding structure of an HJT battery piece.

Background

The conventional multi-main-grid mode adopted by the welding process of the HJT battery piece is somewhat insufficient, and a new welding process and stability are to be researched and developed. At present, the industry is still a few, and the stability and the yield are required to be broken through. The welding process of the HJT battery piece needs low-temperature silver paste and a low-temperature welding technology, the reduction of the consumption of the silver paste is the future requirement, the flaking brings new challenges to the welding, and the pain point of the HJT technology is how to reduce the hidden crack in the welding process and improve the welding quality.

At present, the HJT battery structure still adopts an MBB multi-grid mode and an IBC structure, silver paste consumption is excessive, risks of hidden cracks and fragments are increased in the series welding process no matter a plurality of grid lines and welding strips are adopted for welding or IBC back contact welding is adopted, and the yield is low; the printing type tile folding patent adopting the tile folding mode in time is limited, and the dispensing reliability is insufficient; the lamination assembly needs to consider two aspects of problems, namely, firstly, the battery pieces are connected by using the conductive adhesive, so that the automation production difficulty is high; and secondly, current between the battery pieces is mainly collected through the thin grid lines, and once the grid is broken, the series resistance is increased, so that the power loss is increased, especially the broken grid of the adjacent thin grid.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a novel HJT cell series welding structure to solve the above-mentioned problems.

In order to achieve the purpose, the utility model provides the following technical scheme: a novel series welding structure of an HJT battery piece comprises a half battery piece, wherein a positive electrode main grid line positioned on the left side of the front side of the half battery piece and a plurality of auxiliary grid lines perpendicular to the positive electrode main grid line are arranged on a positive electrode surface piece of the half battery piece, and a negative electrode main grid line positioned on the back side of the half battery piece and a back electric field are arranged on a negative electrode surface piece of the half battery piece;

welding strips are adopted between two adjacent half battery pieces to be connected in series, and a first welding position, a second welding position and a bending part arranged between the first welding position and the second welding position are welded;

the lower surface of a first welding position on the welding strip is welded with the negative main grid line on the half cell piece on the left side, and the upper surface of a second welding position on the welding strip is welded with the positive main grid line on the half cell piece on the right side.

Preferably, the half cell is cut in a cutting mode perpendicular to the auxiliary grid line or parallel to the positive electrode main grid line.

Preferably, the positive main grid line is parallel to a half cutting surface of a half cell, the negative main grid line is parallel to a half cutting surface of a half cell, and the negative main grid line is arranged on the side opposite to the positive main grid line.

Preferably, the solder strip is a flat solder strip, the thickness of the solder strip is.mm, and the solder strip is made of materials with tin plated on the surface of aluminum, tin plated on the surface of copper or flexible conductive films.

Preferably, the first welding position and the second welding position are both provided with through holes which are arranged at equal intervals.

The utility model has the technical effects and advantages that: in the novel series welding structure of the HJT battery piece, the anode of a half battery piece is composed of an anode main grid line and an auxiliary grid perpendicular to the anode main grid line, the cathode of the half battery piece is composed of a cathode main grid line and a back electric field, the half battery piece is cut in a cutting mode perpendicular to the auxiliary grid line or parallel to the anode main grid line, the anode main grid line is parallel to the half cutting surface of the half battery piece, the cathode main grid line is parallel to the half cutting surface of the half battery piece,

the lower surface of a first welding part on the welding strip is welded with the negative main grid line on the left half cell piece, the upper surface of a second welding part on the welding strip is welded with the positive main grid line on the right half cell piece, and the series welding structure of the cell pieces can solve the problem of hidden cracking in the welding process, greatly reduces the consumption of silver paste and the welding strip, reduces the cost, reduces the silver paste consumption by more than 80%, and reduces the consumption of the welding strip 6 by more than 60%; the CTM is increased by more than 60 percent; the thickness reduction range of the EVA/POE is 35-40%, the positive electrode and the negative electrode of the battery structure are both composed of a grid, and the battery piece can be welded in series by adopting aluminum or copper and a conductive film in the aspect of welding strips; because one grid line is adopted, the consumption of silver paste is greatly reduced, and hidden cracks and fragments caused by welding a plurality of grid lines are reduced.

Drawings

FIG. 1 is a schematic structural diagram of the front side of a half cell according to the present invention;

FIG. 2 is a schematic diagram of the structure of the back side of a half cell of the present invention;

FIG. 3 is a schematic diagram of a front side structure of a plurality of half cells connected in series according to the present invention;

FIG. 4 is a schematic view of the structure of the back side of a plurality of half-cells connected in series according to the present invention;

FIG. 5 is a schematic structural view of the solder strip connecting two adjacent half cells according to the present invention;

FIG. 6 is a schematic view of a solder strip of the present invention;

fig. 7 is a perspective view of the solder strip of the present invention.

In the figure: 1. half of the cell; 2. a positive main gate line; 3. a secondary gate line; 4. a negative main grid line; 5. a back electric field; 6. welding a strip; 7. a first weld; 8. a second weld; 9. a bending part; 10. and a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a novel HJT battery piece series welding structure as shown in figures 1-7, which comprises a half battery piece 1, wherein a positive electrode main grid line 2 positioned on the left side of the front surface of the half battery piece 1 and a plurality of auxiliary grid lines 3 perpendicular to the positive electrode main grid line 2 are arranged on a positive electrode surface piece of the half battery piece 1, a negative electrode main grid line 4 positioned on the back surface of the half battery piece 1 and a back electric field 5 are arranged on a negative electrode surface piece of the half battery piece 1, the half battery piece 1 is cut in a cutting mode perpendicular to the auxiliary grid lines 3 or parallel to the positive electrode main grid line 2, the positive electrode main grid line 2 is parallel to a half cutting surface of the half battery piece 1, the negative electrode main grid line 4 is parallel to the half cutting surface of the half battery piece 1, and the negative electrode main grid line 4 is arranged on one side opposite to the positive electrode main grid line 2;

the positive electrode of the half cell 1 is composed of a positive electrode main grid line 2 and a secondary grid line 3 perpendicular to the positive electrode main grid line 2, the negative electrode of the half cell 1 is composed of a negative electrode main grid line 4 and a back electric field 5, the half cell 1 is cut in a cutting mode perpendicular to the secondary grid line 3 or parallel to the positive electrode main grid line 2, the positive electrode main grid line 2 is parallel to the half cutting surface of the half cell 1, and the negative electrode main grid line 4 is parallel to the half cutting surface of the half cell 1;

as shown in fig. 5 and 6, two adjacent half battery pieces 1 are connected in series by a solder strip 6, the solder strip 6 comprises a first solder joint 7, a second solder joint 8 and a bending part 9 arranged between the first solder joint 7 and the second solder joint 8, the solder strip 6 is a flat solder strip, the thickness of the solder strip 6 is 0.1mm, the solder strip 6 is made of a material with tin plated on an aluminum surface, tin plated on a copper surface or a flexible conductive film, and the first solder joint 7 and the second solder joint 8 are respectively provided with through holes 10 arranged at equal intervals, as shown in fig. 7, the through holes 10 are punched on the solder strip 6, so that the stress problem generated in the solder strip welding process is reduced, and the deformation and stress release are increased;

the lower surface of a first welding part 7 on the welding strip 6 is welded with the negative main grid line 4 on the half cell piece 1 on the left side, and the upper surface of a second welding part 8 on the welding strip 6 is welded with the positive main grid line 2 on the half cell piece 1 on the right side; the flat solder strip 6 that connects in series between two half battery pieces 1 carries out series connection welding through bending, welds area 6 and is the flat solder strip, and thickness can be done at 0.01mm, and the material can be aluminium or copper surface tin-plating, also can adopt flexible conductive film material.

In the novel series welding structure of the HJT battery piece, the anode of a half battery piece 1 is composed of an anode main grid line 2 and an auxiliary grid line 3 which is vertical to the anode main grid line 2, the cathode of the half battery piece 1 is composed of a cathode main grid line 4 and a back electric field 5, the half battery piece 1 is cut by a cutting mode which is vertical to the auxiliary grid line 3 or parallel to the anode main grid line 2, the anode main grid line 2 is parallel to a half cutting surface of the half battery piece 1, the cathode main grid line 4 is parallel to the half cutting surface of the half battery piece 1,

the lower surface of a first welding part 7 on the welding strip 6 is welded with a negative electrode main grid line 4 on the left half cell piece 1, and the upper surface of a second welding part 8 on the welding strip 6 is welded with a positive electrode main grid line 2 on the right half cell piece 1, so that the series welding structure of the cell pieces can solve the problem of hidden cracking in the welding process, and meanwhile, the consumption of silver paste and the welding strip 6 is greatly reduced, the cost is reduced, the consumption of the silver paste is reduced by more than 80%, and the consumption of the welding strip 6 is also reduced by more than 60%; the CTM is increased by more than 60 percent; the thickness reduction range of the EVA/POE is 35-40%, the positive electrode and the negative electrode of the battery structure are both composed of a grid, and the welding strip 6 can adopt aluminum or copper and a conductive film to serially weld battery pieces; because one grid line is adopted, the consumption of silver paste is greatly reduced, and hidden cracks and fragments caused by welding a plurality of grid lines are reduced.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims (5)

1. The utility model provides a novel HJT battery piece series welding structure, includes half battery piece (1), its characterized in that: an anode main grid line (2) positioned on the left side of the front face of the half cell (1) and a plurality of auxiliary grid lines (3) perpendicular to the anode main grid line (2) are arranged on the anode surface patch of the half cell (1), and a cathode main grid line (4) and a back electric field (5) positioned on the back face of the half cell (1) are arranged on the cathode surface patch of the half cell (1);

welding strips (6) are adopted between two adjacent half battery pieces (1) to be connected in series, and the welding strips (6) comprise a first welding part (7), a second welding part (8) and a bending part (9) arranged between the first welding part (7) and the second welding part (8);

the lower surface of a first welding position (7) on the welding strip (6) is welded with the negative main grid line (4) on the half cell piece (1) on the left side, and the upper surface of a second welding position (8) on the welding strip (6) is welded with the positive main grid line (2) on the half cell piece (1) on the right side.

2. The HJT cell string welding structure of claim 1, wherein: the half battery piece (1) is cut in a cutting mode perpendicular to the auxiliary grid line (3) or parallel to the positive electrode main grid line (2).

3. The HJT battery plate series welding structure of claim 1, wherein: the positive electrode main grid line (2) is parallel to a half cutting surface of a half cell (1), the negative electrode main grid line (4) is parallel to the half cutting surface of the half cell (1), and the negative electrode main grid line (4) is arranged on one side opposite to the positive electrode main grid line (2).

4. The HJT cell string welding structure of claim 1, wherein: the welding strip (6) is a flat welding strip, the thickness of the welding strip (6) is 0.1mm, and the welding strip (6) is made of materials with tin plated on the surface of aluminum, tin plated on the surface of copper or flexible conducting films.

5. The HJT battery plate series welding structure of claim 1, wherein: the first welding part (7) and the second welding part (8) are provided with through holes (10) which are arranged at equal intervals.

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