Solar cell and laser sintering probe fixing device

Abstract

The solar cell is provided with an electrode, the electrode comprises a plurality of main grid lines and a plurality of fine grid lines which are connected with the main grid lines in a staggered manner, and each main grid line is provided with at least two welding strip contact point positions; the two ends of the main grid line are respectively provided with a probe contact point, the probe contact points are located on the outer sides of the welding strip contact points, and the width of the probe contact points is larger than the line width of the main grid line. The utility model also provides a laser sintering probe fixing device for sintering the solar cell. Compared with the prior art, the number of probes required by the solar cell during laser sintering is small, the hidden crack risk caused by too many probes is effectively relieved, the maintenance cost is also reduced, and meanwhile, a structural basis is provided for optimizing the structure of the probe fixing device and preventing the probe fixing device from shielding laser.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cells, and in particular relates to a solar cell and a laser sintering probe fixing device for assisting laser sintering of the solar cell. Background Art

[0002] At present, in order to improve welding performance, existing solar cells are designed with harpoon structures at both ends of the main grid line. For example, in the multi-busbar crystalline silicon solar cell disclosed in the authorization announcement number CN212230439U, harpoons or U-shaped structures are provided at the beginning and end of the main grid line of the electrode mesh structure.

[0003] For the above-mentioned electrode screen structure, laser-assisted sintering technology is used to sinter it. Laser-assisted sintering technology is a new process method. It irradiates the battery cell with high-intensity laser and matches it with a deflection voltage of 10V or more. The local current of several amperes generated thereby forms contact between the metal and the semiconductor. When the deflection voltage is applied, the probe is pressed on the main grid line. Due to the small line width of the main grid line, a large number of probes need to be installed on the probe row, or a larger probe is used to ensure that a sufficient number of probes can be pressed on the main grid line. In order to connect a large number of probes, the existing connection structure is mostly plate-shaped, which will block the laser and affect the laser sintering effect. In order to avoid the impact caused by blocking the laser, the process of laser sintering is as follows: after the probe on the probe row presses down the main grid line on the left edge of the battery cell, the laser scans the right half, and after the probe is finished, it presses down the main grid line on the right edge of the battery cell again, and the laser scans the left half, that is, the laser sintering of half of the battery cell is completed first and then the laser sintering of the other half is completed. This laser sintering method needs to be completed in two steps, which is inefficient and affects the production line capacity. In addition, due to the large number of probes, there are more points on the battery cell that are pressed by the probes, and the risk of hidden cracks in the battery cell is greater; the probes are consumables, and when they need to be replaced, the large number will result in longer maintenance time and cost. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a solar cell.

[0005] To achieve the above objectives, the utility model discloses a solar cell, wherein the solar cell is provided with electrodes, wherein the electrodes include a plurality of main grid lines and a plurality of thin grid lines staggeredly connected thereto, and each main grid line is provided with at least two welding strip contact points;

[0006] A probe contact point is respectively arranged at both ends of the main grid line. The probe contact point is located outside the soldering strip contact point, and its width is greater than the line width of the main grid line.

[0007] Preferably, the distance between the probe contact point and the edge of the battery cell is 0 mm-10 mm.

[0008] Preferably, the cross-sectional area of ​​the probe contact point is 0.1 mm 2 -2mm 2 .

[0009] Preferably, the probe contact points are solid points.

[0010] The utility model also provides a laser sintering probe fixing device for laser sintering the solar cell sheet.

[0011] A laser sintering probe fixing device, used for assisting the laser sintering of solar cells, wherein the solar cells are any of the solar cells described above;

[0012] The laser sintering probe fixing device comprises a support and a connecting piece, one end of the connecting piece is connected to the support, and the other end is used to connect the probe;

[0013] There are a plurality of connecting members, and the plurality of connecting members are arranged at intervals.

[0014] Preferably, the connecting member is detachably connected to the support.

[0015] Further preferably, the connecting member is slidably connected to the support;

[0016] The laser sintering probe fixing device further comprises a fastener, and the fastener is used to fix the connecting member to a specified position.

[0017] Further preferably, the support is provided with a slide groove arranged along the length direction thereof, and one end of the connecting member is slidably arranged in the slide groove;

[0018] The connecting member is provided with a connecting portion, the support is provided with an avoidance groove penetrating to the slide slot, the avoidance groove is arranged opposite to the connecting portion and arranged in the same direction as the slide slot, and the fastener passes through the avoidance groove and is detachably connected to the connecting portion.

[0019] Preferably, the connecting member comprises a connecting section, a vertical section and a transverse section which are connected in sequence, the connecting section is used to be connected to the support, the vertical section is vertically arranged, and the transverse section is horizontally arranged for connecting the probe.

[0020] Further preferably, the connecting piece is Z-shaped.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The width of the probe contact point is larger than the line width of the main grid line, which ensures that each probe can be pressed onto the probe contact point, thereby reducing the number of probes used (not exceeding the number of probe contact points), effectively alleviating the risk of hidden cracks caused by too many probes, and also reducing maintenance costs.

[0023] (2) The probe contact point is located at the end of the main grid line and outside the soldering ribbon contact point. With this arrangement, the probe applies a deflection voltage at the probe contact point (near the edge of the cell) during laser sintering, which provides a structural basis for optimizing the structure of the probe fixture to prevent it from blocking the laser. The soldering ribbon contact point is located inside the probe contact point, which can ensure the welding quality and avoid the risk of hidden cracks caused by its location at the edge of the cell.

[0024] (3) There are multiple connectors, which are arranged at intervals. During laser sintering, the end of the connector used to connect the probe moves to a position opposite to the probe contact point. No other structure extends into the space between two adjacent connectors, which will not block the laser and ensure the laser sintering effect. Furthermore, during the laser sintering process, the laser can be scanned from one side of the battery cell to the other side at one time, thereby improving the sintering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a laser sintering probe fixing device and a solar cell in the embodiment;

[0026] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0027] Figure 3 It is a schematic diagram of the three-dimensional exploded structure of the connector, probe and fastener;

[0028] Main grid line 1; thin grid line 2; solder strip contact point 3; probe contact point 4;

[0029] Support 5; slide groove 51; avoidance groove 52; connecting member 6; connecting section 61; connecting portion 611; vertical section 62; transverse section 63; probe 7; fastener 8. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly defined and specified, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0033] The following is combined with Figure 1-3 The technical solution of the utility model is further explained.

[0034] Example 1

[0035] A solar cell is provided with electrodes. Of course, the solar cell also includes an anti-reflection film, an N-type semiconductor, a PN junction and a P-type silicon crystal. This is the existing structure of the solar cell and will not be described in detail here.

[0036] See also Figure 1 The electrode includes a plurality of main grid lines 1 and a plurality of thin grid lines 2 interlaced therewith. Specifically, the main grid lines 1 and the thin grid lines 2 intersect vertically. It can be understood that the motor of the grid line structure is arranged on one of the front and back sides, or the grid line structure electrode is arranged on both sides. Each main grid line 1 is provided with at least two welding strip contact points 3.

[0037] Among them, the number of main grid lines 1 and thin grid lines 2 can be set according to actual needs. Multiple welding strip contact points 3 can be set on each main grid line 1, which can improve the later welding effect. The two outermost welding strip contact points 3 are close to the edge of the battery cell, and optionally they are 1 cm away from the edge of the battery cell. This can ensure the welding quality and avoid the risk of hidden cracks caused by being located at the edge of the battery cell.

[0038] See also Figure 1-Figure 2, a probe contact point 4 is provided at each end of the main grid line 1, and the probe contact point 4 is located outside the solder strip contact point 3. With such a configuration, the probe can apply a deflection voltage at the probe contact point 4 during laser sintering, and this position is located at the edge of the battery cell, which provides a structural basis for optimizing the structure of the probe fixing device to prevent it from blocking the laser. The width of the probe contact point 4 is greater than the line width of the main grid line 1, which ensures that each probe 7 can be pressed onto the probe contact point 4, thereby reducing the amount of probe 7 (not exceeding the number of probe contact points 4, which is less than the traditional dozens), which effectively alleviates the risk of hidden cracks caused by too many probes and also reduces maintenance costs.

[0039] In this embodiment, the distance between the probe contact point 4 and the edge of the cell is 0 mm-10 mm, which can not only ensure the welding quality of the solar cell, but also provide a structural basis for optimizing the structure of the probe fixing device to avoid it blocking the laser.

[0040] In this embodiment, the cross-sectional area of ​​the probe contact point 4 is 0.1 mm 2 -2mm 2 This enables the probe 7 to be accurately pressed onto the probe contact point 4 to ensure the laser sintering effect. The cross-sectional area is the surface where the probe contact point 4 can contact the probe.

[0041] In this embodiment, the probe contact point 4 is a solid point, so that the probe 7 can contact the probe contact point 4, making it easier for the probe 7 to apply a deflection voltage thereto.

[0042] In this embodiment, the cross-sectional shape of the probe contact point 4 is circular, rectangular or other shapes, preferably circular, which matches the bottom surface of the probe 7 .

[0043] Example 2

[0044] A laser sintering probe fixing device is used to assist in laser sintering of the solar cell sheet described in Example 1.

[0045] See also Figure 1-Figure 2 The laser sintering probe fixing device includes a support 5 and a connecting member 6, one end of the connecting member 6 is connected to the support 5, and the other end is used to connect the probe 7. There are multiple connecting members 6, and the multiple connecting members 6 are arranged at intervals. During laser sintering, Figure 1As shown, two groups of laser sintering probe fixing devices are located at both ends of the main grid line 1, and a plurality of spaced connecting members 6 on each group of probe fixing devices are each connected to a probe 7, and each probe 7 corresponds to pressing down a probe contact point 4 at the end of the main grid line 1. During the pressing process, the end of the connecting member 6 used to connect the probe 7 is located at a position opposite to the probe contact point 4, and no other structure extends into the space between two adjacent connecting members 6, which will not block the laser, thereby ensuring the laser sintering effect; furthermore, during the laser sintering process, the laser can be scanned from one side of the battery cell to the other side at one time, thereby improving the sintering efficiency.

[0046] In this embodiment, the connecting member 6 is detachably connected to the support 5, which facilitates replacement of the probe 7 and improves maintenance efficiency.

[0047] Furthermore, the connector 6 is slidably connected to the support 5, which can adjust the position of the connector 6 according to the position of the probe contact point 4 on each solar cell, and is applicable to a variety of solar cells and has a wide range of applications. The laser sintering probe fixing device also includes a fastener 8, which is used to fix the connector 6 to a specified position, thereby fixing the sliding connector 6 to a specified position to ensure the assembly effect.

[0048] Specifically, Figure 1-Figure 3 As shown, the support 5 is provided with a slide groove 51 arranged along its length direction, and one end of the connecting member 6 is slidably arranged in the slide groove 51; the connecting member 6 is provided with a connecting portion 611, which is preferably a threaded hole in this embodiment, and the support 5 is provided with an avoidance groove 52 that penetrates the slide groove 51, and the avoidance groove 52 is arranged opposite to the connecting portion 611 and arranged in the same direction as the slide groove 51, and the fastener 8 (preferably a screw) passes through the avoidance groove 52 and is detachably connected to the connecting portion 611. The above structure is simple and easy to assemble.

[0049] In this embodiment, the connector 6 includes a connecting section 61, a vertical section 62 and a transverse section 63 connected in sequence, the free end of the connecting section 61 is slidably arranged in the slide groove 51, the connecting portion 611 is arranged on the connecting section 61, the vertical section 62 is vertically arranged, and the transverse section 63 is horizontally arranged, which is used to connect the probe 7. During laser sintering, part of the transverse section 63 is located above the probe contact point and will not block the laser. Preferably, the connector 6 is Z-shaped. Of course, it is understandable that the connector 6 can also be set to other shapes, such as a straight line.

[0050] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A solar cell, characterized in that: The solar cell is provided with electrodes, which include a plurality of main grid lines and a plurality of thin grid lines staggeredly connected thereto, and each main grid line is provided with at least two welding strip contact points; A probe contact point is respectively arranged at both ends of the main grid line. The probe contact point is located outside the soldering strip contact point, and its width is greater than the line width of the main grid line.

2. The solar cell according to claim 1, characterized in that: The distance between the probe contact point and the edge of the battery cell is 0mm-10mm.

3. The solar cell according to claim 1, characterized in that: The cross-sectional area of ​​the probe contact point is 0.1 mm 2 -2mm 2 .

4. The solar cell according to claim 1, characterized in that: The probe contact points are solid points.

5. A laser sintering probe fixing device, used to assist in laser sintering of solar cells, characterized in that: The solar cell is a solar cell according to any one of claims 1 to 4; The laser sintering probe fixing device comprises a support and a connecting piece, one end of the connecting piece is connected to the support, and the other end is used to connect the probe; There are multiple connecting pieces, and the multiple connecting pieces are arranged at intervals.

6. The laser sintering probe fixing device according to claim 5, characterized in that: The connecting piece is detachably connected to the support.

7. The laser sintering probe fixing device according to claim 6, characterized in that: The connecting member is slidably connected to the support; The laser sintering probe fixing device further comprises a fastener, and the fastener is used to fix the connecting member to a specified position.

8. The laser sintering probe fixing device according to claim 7, characterized in that: The support is provided with a slide groove arranged along the length direction thereof, and one end of the connecting member is slidably arranged in the slide groove; The connecting member is provided with a connecting portion, the support is provided with an avoidance groove penetrating to the slide slot, the avoidance groove is arranged opposite to the connecting portion and arranged in the same direction as the slide slot, and the fastener passes through the avoidance groove and is detachably connected to the connecting portion.

9. The laser sintering probe fixing device according to claim 5, characterized in that: The connecting member comprises a connecting section, a vertical section and a transverse section which are connected in sequence. The connecting section is used to connect with the support. The vertical section is arranged vertically, and the transverse section is arranged horizontally, and is used to connect with the probe.

10. The laser sintering probe fixing device according to claim 9, characterized in that: The connecting piece is in a Z shape.

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