A structure for improving welding strength of a back contact cell

Abstract

The utility model discloses a kind of structures for improving back contact battery welding strength, it is related to photovoltaic cell technical field, its technical key points include OBB battery, main grid, fine grid, harpoon mouth, PAD point and arc tangent, the main grid and fine grid of several described are perpendicularly distributed on OBB battery, the end portion of the main grid is provided with harpoon mouth, the junction of the harpoon mouth and main grid is provided with PAD point, the junction of the main grid and fine grid and PAD point is all provided with arc tangent, one end of part of the arc tangent and the vertex position of PAD point contact, two ends of another part of the arc tangent respectively with main grid and fine grid contact.The technical effect is to make arc tangent at PAD right angle at the junction of back contact OBB battery main grid and PAD point, increase welding tension, can prevent the fracture caused by edge sharp angle, right angle structure, the design of arc tangent makes current transmission more smooth, reduces the loss of current in transmission process, improves current collection and transmission efficiency.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell technology, specifically a structure for improving the welding strength of back contact cells. Background Technology

[0002] In solar photovoltaic technology, the most significant feature of the interdigitated back contact (IBC) cell is that both the PN junction and the contact metal are located on the back side of the IBC cell. The front side of the IBC cell completely avoids the shading of the metal grid electrodes, which can maximize the utilization of incident light, reduce optical loss, and have a higher short-circuit current.

[0003] Currently, existing back contact batteries, due to the lack of a reinforcing welding structure at the PAD apex and the absence of an arc-shaped structure during the welding process, may experience OBB battery warping and breakage at the welding point, resulting in welding tensile strength tests failing to meet requirements.

[0004] Therefore, we propose a structure to improve the welding strength of the back contact battery. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a structure that enhances the welding strength of back contact batteries. This solves the problem that existing back contact batteries, during the welding process, may experience OBB battery breakage at the welding point due to OBB battery warping, resulting in welding tensile strength tests failing to meet requirements.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a structure for improving the welding strength of a back contact battery, comprising an OBB battery, a main grid, a fine grid, a fork opening, a PAD point, and an arc-shaped tangent. A plurality of the main grids and fine grids are distributed perpendicularly to each other on the OBB battery. A fork opening is provided at the end of the main grid, and a PAD point is provided at the junction of the fork opening and the main grid.

[0009] Arc-shaped tangents are provided at the junctions of the main grid, the fine grid, and the PAD points.

[0010] Preferably, the number of fine grids is 148.

[0011] Preferably, the width of the fine grid is 13±1.5um.

[0012] Preferably, a portion of the fine grid is in contact with the harpoon opening.

[0013] Preferably, another portion of the fine grid is in contact with the main grid.

[0014] Preferably, one end of a portion of the arcuate tangent contacts the vertex of the PAD point.

[0015] Preferably, the two ends of the arcuate tangent in the other part are in contact with the main grid and the fine grid, respectively.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a method with the following beneficial effects:

[0018] 1. This utility model increases welding tension by making an arc-shaped tangent at the right angle of the PAD at the junction of the back contact OBB battery main grid and the PAD point, which can prevent breakage caused by sharp edges and right angle structures.

[0019] 2. This utility model, by setting an arc-shaped tangent, generates photogenerated carriers when light shines on the surface of the back contact battery during current collection and transmission. Under the action of the internal electric field of the battery, the photogenerated carriers migrate towards the fine grid. The fine grid collects the current generated by the photogenerated carriers and transmits it to the main grid along the optimized path of the arc-shaped tangent. The arc-shaped tangent design makes the current transmission from the fine grid to the main grid smoother, reduces the current loss during transmission, and improves the current collection efficiency. The main grid collects the current from the fine grid and converges it to the PAD point. The arc-shaped tangent design at the junction of the PAD point and the main grid ensures a smooth transition of the current when entering the PAD point, further reducing current transmission loss and improving current transmission efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0022] Figure 3 This utility model Figure 1 Enlarged view of the structure at point B in the middle.

[0023] In the picture:

[0024] 1. OBB battery;

[0025] 2. Main gate;

[0026] 3. Fine grid;

[0027] 4. Harpoon mouth;

[0028] 5. PAD point;

[0029] 6. Curved tangent. Detailed Implementation

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] This utility model provides a technical solution:

[0032] Please see Figures 1-3 A structure for improving the welding strength of a back contact battery includes an OBB battery 1, main grids 2, fine grids 3, a fork-shaped opening 4, a PAD point 5, and an arc-shaped tangent 6. Several main grids 2 and fine grids 3 are perpendicularly distributed on the OBB battery 1. A fork-shaped opening 4 is provided at the end of each main grid 2, and a PAD point 5 is provided at the junction of the fork-shaped opening 4 and the main grid 2. Arc-shaped tangents 6 are provided at the junctions of the main grid 2 with the fine grids 3 and at the PAD point 5. An arc-shaped tangent is made at the right angle of the PAD at the junction of the main grid 2 and the PAD point 5 of the back contact OBB battery 1 to increase welding tensile strength.

[0033] The number of fine grids 3 is 148, and the width of the fine grids 3 is 13±1.5um. A portion of the fine grids 3 is in contact with the harpoon opening 4. When light shines on the surface of the back contact battery, photogenerated carriers are generated. Under the influence of the electric field inside the battery, the photogenerated carriers migrate towards the fine grids.

[0034] Another portion of the fine gate 3 contacts the main gate 2, and one end of a portion of the arc tangent 6 contacts the vertex of the PAD point 5; the fine gate 3 collects the current generated by photogenerated carriers and transmits it to the main gate 2 along the optimized path of the arc tangent.

[0035] The arc-shaped tangent design facilitates smoother current transmission from the fine gate 3 to the main gate 2, reducing current loss during transmission and improving current collection efficiency. The main gate 2 collects current from the fine gate 3 and converges it to point PAD 5. The arc-shaped tangent design at the junction of point PAD 5 and main gate 2 ensures a smooth transition of current when entering point PAD 5, further reducing current transmission loss and improving current transmission efficiency.

[0036] The other part of the arc-shaped tangent 6 has its two ends in contact with the main grid 2 and the fine grid 3, respectively; in the back-contact OBB battery, the solder strip is connected to the solder strip area at the end of the fine grid 3, which has been treated by the arc-shaped tangent 6. The arc-shaped tangent 6 design improves the connection performance between the solder strip and the fine grid 3, making the welding more robust and reliable, while reducing the contact resistance at the connection.

[0037] Current is transmitted to the external circuit through the solder ribbon, realizing the electrical connection and energy output of the battery. The solder ribbon connection area, after being treated with arc-shaped tangent 6, ensures the stability and reliability of the battery during long-term use and reduces performance degradation caused by connection problems.

[0038] In practical use, the working principle of this utility model is as follows:

[0039] During current collection and transmission, light irradiates the surface of the back contact battery, generating photogenerated carriers. Under the influence of the internal electric field of the battery, the photogenerated carriers migrate towards the fine grid 3. The fine grid 3 collects the current generated by the photogenerated carriers and transmits it to the main grid 2 along the optimized path of the arc tangent 6. The design of the arc tangent 6 makes the current transmission from the fine grid 3 to the main grid 2 smoother, reduces the current loss during transmission, and improves the current collection efficiency. The main grid 2 collects the current from the fine grid 3 and converges it to the PAD point 5. The design of the arc tangent 6 at the junction of the PAD point 5 and the main grid 2 ensures a smooth transition of the current when entering the PAD point 5, further reducing the current transmission loss and improving the current transmission efficiency.

[0040] In summary, this structure for improving the welding strength of the back contact battery increases welding tensile strength by creating an arc-shaped tangent 6 at the right angle of PAD5 at the junction of the main grid 2 and PAD point 5 of the back contact OBB battery 1. This prevents breakage caused by sharp edges and right-angle structures. During current collection and transmission, light irradiates the surface of the back contact battery, generating photogenerated carriers. Under the influence of the internal electric field of the battery, the photogenerated carriers migrate towards the fine grid 3. The fine grid 3 collects the current generated by the photogenerated carriers and transmits it to the main grid 2 along the optimized path of the arc-shaped tangent 6. The design of the arc-shaped tangent 6 makes the current transmission from the fine grid 3 to the main grid 2 smoother, reduces current loss during transmission, and improves current collection efficiency. The main grid 2 collects the current from the fine grid 3 and converges it to PAD point 5. The design of the arc-shaped tangent 6 at the junction of PAD point 5 and main grid 2 ensures a smooth transition of current when entering PAD point 5, further reducing current transmission loss and improving current transmission efficiency.

[0041] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A structure for improving the welding strength of a back contact battery, comprising an OBB battery (1), a main grid (2), a fine grid (3), a fork-shaped opening (4), a PAD point (5), and an arc-shaped tangent (6), characterized in that: Several main grids (2) and fine grids (3) are perpendicularly distributed on the OBB battery (1). The end of the main grid (2) is provided with a harpoon mouth (4), and a PAD point (5) is provided at the junction of the harpoon mouth (4) and the main grid (2). Arc-shaped tangents (6) are provided at the junctions of the main grid (2), the fine grid (3), and the PAD point (5).

2. The structure for improving the welding strength of a back contact battery according to claim 1, characterized in that: The number of fine grids (3) is 148.

3. The structure for improving the welding strength of a back contact battery according to claim 1, characterized in that: The width of the fine grid (3) is 13±1.5um.

4. The structure for improving the welding strength of a back contact battery according to claim 1, characterized in that: One portion of the fine grid (3) is in contact with the harpoon mouth (4).

5. The structure for improving the welding strength of a back contact battery according to claim 4, characterized in that: Another portion of the fine grid (3) is in contact with the main grid (2).

6. The structure for improving the welding strength of a back contact battery according to claim 1, characterized in that: One end of one portion of the arcuate tangent (6) contacts the vertex of the PAD point (5).

7. The structure for improving the welding strength of a back contact battery according to claim 1, characterized in that: The two ends of the arc-shaped tangent (6) described in the other part are in contact with the main grid (2) and the fine grid (3), respectively.

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