Laser-induced sintering device

Abstract

The utility model discloses a laser-induced sintering device, which is applied to laser-induced sintering of photovoltaic cells and comprises a bearing platform for bearing the photovoltaic cells. The two parallel probe rows are arranged above the bearing platform and are electrically connected with an external power supply; a laser; in the direction perpendicular to the length direction of the probe rows, the distance H between the two probe rows is not smaller than one fourth of the length size L1 of the photovoltaic battery piece; the probe row is used for being in parallel or vertical contact with a main grid line on a photovoltaic cell so as to apply power supply voltage to the main grid line; and the laser is used for performing laser scanning irradiation on the surface of the photovoltaic cell. The two parallel probe rows are configured on the bearing platform, so that the number of carriers on the photovoltaic cell is more sufficient, the carriers are evenly distributed, the problems of EL black edges, half-section type grid breaking and the like of the photovoltaic cell are solved to a great extent, and the laser-induced sintering effect of the photovoltaic cell is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell manufacturing technology, and in particular to a laser-induced sintering device. Background Technology

[0002] LIF (Laser Induced Firing) technology is a laser-induced repair technique. In the photovoltaic field, laser-induced sintering technology can effectively avoid defects in photovoltaic cell welding, achieve precise connections, reduce energy consumption and heat loss, and thus improve the overall efficiency of photovoltaic modules.

[0003] In the LIF laser sintering process of photovoltaic cells, an external power supply is connected to the grid lines on the photovoltaic cell through a probe, thereby injecting charge carriers into the cell. The laser scans and irradiates the photovoltaic cell, activating the charge carriers and changing their electrical properties. This sintering process of the dielectric layer (alumina and silicon nitride) solves the problem of under-sintering or over-sintering in the original glass system, thus forming a better ohmic contact and improving the photoelectric efficiency of the cell.

[0004] However, after LIF laser technology is used to repair photovoltaic cells by laser sintering, problems such as black edges of EL (Electroluminescent) cells and half-section broken grids often occur. Utility Model Content

[0005] The purpose of this invention is to provide a laser-induced sintering device that can largely avoid problems such as black edges and half-section grid breaks in photovoltaic cells, effectively ensuring the effect of laser-induced sintering of photovoltaic cells.

[0006] To solve the above-mentioned technical problems, this utility model provides a laser-induced sintering device for laser-induced sintering of photovoltaic cells, including a support platform for supporting photovoltaic cells; two parallel probe arrays disposed above the support platform and electrically connected to an external power source; and a laser disposed above the support platform.

[0007] In the direction perpendicular to the length of the probe array, the distance H between two probe arrays is not less than one-quarter of the length dimension L1 of the photovoltaic cell; the probe array is used to make contact with the main grid lines on the photovoltaic cell, either parallel or perpendicular to each other, so as to simultaneously apply a power supply voltage to the main grid lines.

[0008] The laser is used to perform laser scanning irradiation on the surface of the photovoltaic cell.

[0009] In one optional embodiment of this application, the positions of the two probe rows can be adjusted independently in the length direction perpendicular to the probe rows.

[0010] In an alternative embodiment of the present application, the probe array comprises a strip-shaped array plate, a plurality of probes are arranged along the length direction of the strip-shaped array plate; the plurality of probes are arranged in two rows and staggered in a zigzag manner; one end of the strip-shaped array plate and each probe are electrically connected, and the other end of the probe is used to contact the photovoltaic cell piece;

[0011] In the X direction, the distance L2 between two probes staggered with each other in the two rows of probes satisfies 0.5D≤L2≤D, wherein D is the width of each probe in the Y direction, the Y direction is perpendicular to the length direction of the strip-shaped array plate, and the X direction is parallel to the length direction of the strip-shaped array plate.

[0012] In an alternative embodiment of the present application, each probe is a conductive column, and the size of the conductive column in the X direction is smaller than the size in the Y direction.

[0013] In an alternative embodiment of the present application, the strip-shaped array plate is provided with a plurality of insertion holes arranged in two rows in a parallel staggered manner, the plurality of insertion holes and the plurality of probes correspond one-to-one, and the probes are detachably inserted into the insertion holes.

[0014] In an alternative embodiment of the present application, a conductive layer is arranged on the hole wall of the insertion hole.

[0015] In an alternative embodiment of the present application, each probe array contains 56-64 probes.

[0016] In an alternative embodiment of the present application, the laser is a light source capable of simultaneously outputting two laser beams, which is used for laser scanning on the surface of the photovoltaic cell piece; one of the laser beams irradiates on a region M between the two probe arrays, and the other laser beam irradiates on a region N on one side of the probe array and away from the region M.

[0017] In an alternative embodiment of the present application, the laser is a light source capable of simultaneously outputting two laser beams, which is used for laser scanning on the surface of the photovoltaic cell piece; one of the laser beams irradiates on a region M between the two probe arrays, and the other laser beam irradiates on a region N on one side of the probe array and away from the region M.

[0018] In an alternative embodiment of the present application, the number of the bearing platforms is two; each bearing platform is provided with the laser and two probe arrays;

[0019] Further comprising a transfer device for transferring the photovoltaic cell piece between the two bearing platforms.

[0020] The laser-induced sintering device is applied to laser-induced sintering of a photovoltaic cell piece, and comprises a bearing platform for bearing the photovoltaic cell piece, two probe arrays arranged above the bearing platform and electrically connected with an external power supply, a laser device arranged above the bearing platform, and the interval H between the two probe arrays is not less than one fourth of the length L1 of the photovoltaic cell piece in the length direction perpendicular to the probe arrays.

[0021] In the laser-induced sintering device, two probe arrays are arranged above the bearing platform, so that the two probe arrays can connect the main grid lines and apply the power supply voltage to the main grid lines from two different area positions of the photovoltaic cell piece in the process of LIF laser-induced sintering of the photovoltaic cell piece, thereby injecting more carriers into the photovoltaic cell piece, avoiding the problem of insufficient carriers in the area far away from the probe arrays on the photovoltaic cell piece, and making the carriers on the whole photovoltaic cell piece more sufficient and uniformly distributed. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 Part structure schematic diagram of the laser-induced sintering device provided by the embodiment of the present application;

[0024] Figure 2 Laser sintering mode structure schematic diagram of the photovoltaic cell piece provided by the embodiment of the present application;

[0025] Figure 3 Structure schematic diagram of the probe array provided by the embodiment of the present application. DETAILED DESCRIPTION

[0026] The core of the present application is to provide a laser-induced sintering device, which can avoid the problems of EL black edge and half-cut broken grid of the photovoltaic cell piece to a certain extent, and effectively ensure the effect of laser-induced sintering of the photovoltaic cell piece.

[0027] In order to make the person skilled in the art better understand the utility model scheme, the utility model is further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0028] As Figures 1 to 3 Indicated, Figure 1 The partial structure schematic diagram of the laser-induced sintering device provided by the embodiment of the application is provided; Figure 2 The laser sintering mode structure schematic diagram of the photovoltaic cell piece is provided; Figure 3 The structure schematic diagram of the probe row is provided.

[0029] It can be understood that the laser-induced sintering device is mainly applied to the laser-induced sintering of the photovoltaic cell piece 1, especially the multi-main grid photovoltaic cell piece 1 with the number of main grid lines 10 greater than 10, realizes the sintering repair of the photovoltaic cell piece 1, reduces the contact resistance between the photovoltaic cell piece 1 and the metal such as welding strip, and further improves the power generation efficiency of the photovoltaic cell piece 1.

[0030] In a specific embodiment of the application, the laser-induced sintering device is applied to the laser-induced sintering of the photovoltaic cell piece 1, comprising:

[0031] The bearing platform 2 for bearing the photovoltaic cell piece 1;Two mutually parallel probe rows 3 arranged above the bearing platform 2 and electrically connected with the external power supply 4;The laser 5 arranged above the bearing platform 2;

[0032] In the length direction perpendicular to the probe row 3, the spacing H between the two probe rows 3 is not less than one fourth of the length dimension L1 of the photovoltaic cell piece 1;The probe row 3 is used to contact with the main grid line 10 on the photovoltaic cell piece 1 mutually parallel or mutually perpendicular, to simultaneously apply power supply voltage to the main grid line 10;

[0033] The laser 5 is used for laser scanning irradiation to the surface of the photovoltaic cell piece 1.

[0034] The laser-induced sintering device in the embodiment is provided with two probe rows 3 arranged in parallel with each other. When the two probe rows 3 are in contact with each other in parallel with the main grid lines 10 on the photovoltaic cell 1, each of the two probe rows 3 contacts a main grid line 10, and when the two probe rows 3 are connected to the external power supply, the power supply voltage can be applied to the two main grid lines 10 at the same time. At this time, the distance between the two probe rows 3 should be exactly equal to an integer multiple of the distance between the adjacent two main grid lines 10 on the photovoltaic cell 1. Generally, the distance H between the two probe rows 3 should be not less than one fourth of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3, and not more than two thirds of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3. For example, the distance H between the two probe rows 3 can be substantially equal to one half of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3.

[0035] When the two probe rows 3 are in contact with each other in perpendicular to the main grid lines 10 on the photovoltaic cell 1, each of the probe rows 3 is in electrical connection with the multiple main grid lines 10 in turn, and when the probe rows 3 are connected to the external power supply, the power supply voltage can be applied to the main grid lines 10. At this time, the distance H between the two probe rows 3 should be not less than one fourth of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3, and not more than two thirds of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3. Specifically, the distance H between the two probe rows 3 can be substantially equal to one half of the size of the photovoltaic cell 1 in the length direction L1 of the probe row 3.

[0036] It should be noted that, no matter whether the two probe rows 3 are in parallel or perpendicular to the main grid lines 10 on the photovoltaic cell 1, because all the main grid lines 10 on the photovoltaic cell 1 are electrically connected by the fine grid lines, as long as the two probe rows 3 are connected to the external power supply, the power supply voltage is applied to the entire photovoltaic cell 1. It can be understood that, no matter in what form the probe rows 3 are electrically connected to the main grid lines 10, due to the resistance on the photovoltaic cell 1, the farther the distance from the probe rows 3, the smaller the power supply voltage provided by the probe rows 3, and the number of carriers also decreases. Even if there is laser scanning irradiation, the sintering effect of the area is also lacking.

[0037] Therefore, in the present application, two probe rows 3 are arranged, and in the process of laser-induced sintering of the photovoltaic cell 1, the two probe rows 3 are connected to the power supply voltage provided by the external power supply 4 through an external power supply 4, and the two probe rows 3 can simultaneously connect the power supply voltage provided by the external power supply 4 to the photovoltaic cell 1 through the main grid line 10 at two different position areas of the photovoltaic cell 1 with a certain spacing. Therefore, the uniformity of the distribution of the carriers injected by the external power supply on the entire photovoltaic cell 1 can be ensured to a certain extent, so that the sintering effect of the photovoltaic cell 1 can be improved to a certain extent.

[0038] At this time, the main grid line 10 on the front surface of the photovoltaic cell 1 should be electrically connected to the same output end of the external power supply 4 through the probe row 3; in addition, the back electrode of the photovoltaic cell 1 should also be electrically connected to the other output end of the external power supply 4, so that a closed circuit is formed between the external power supply 4 and the photovoltaic cell 1, so that the external power supply 4 can inject a large number of carriers into the photovoltaic cell 1.

[0039] While achieving electrical connection between the photovoltaic cell 1 and the external power supply 4, the laser 5 also needs to cooperate to scan and irradiate a laser beam to the surface of the photovoltaic cell 1 to complete the laser-induced sintering process. For the photovoltaic cell 1, it contains a p-n structure composed of a p region and an n region. After a large number of carriers are injected into the photovoltaic cell 1 under the external applied power supply voltage, the laser beam scanning and irradiation to the photovoltaic cell 1 can activate the carriers to change their electrical properties. The activated carriers can more completely sinter the dielectric layer (aluminum oxide and silicon nitride), thereby achieving the best sintering effect, solving the phenomenon of under-sintering or over-sintering of the original glass system. The local current generated in this process can significantly reduce the contact resistance between the metal (main grid line 10 or solder strip) and the cell, thereby forming a better ohmic contact to realize the output of the high-efficiency solar photovoltaic cell and improve the photoelectric efficiency of the cell.

[0040] It should be noted that when the laser 5 scans and irradiates a laser beam to the surface of the photovoltaic cell 1, the position of the probe row 3 should be avoided; and because two probe rows 3 are arranged in the present embodiment, the front surface of the photovoltaic cell 1 is divided into three different areas. Therefore, when the laser 5 in the present embodiment irradiates the front surface area of the photovoltaic cell 1, it can irradiate the area M between the two probe rows 3 and the area N on one side of the two probe rows 3.

[0041] Referring to Figure 2 , Figure 2 The middle rectangular dashed box is the area irradiated by the laser beam to the photovoltaic cell 1. In Figure 2The embodiment shown is a battery piece containing 16 main grid lines 10 as an example for illustration. The process of laser-induced sintering of the photovoltaic cell 1 should be carried out twice; in the first laser sintering process, the two probe rows 3 can be respectively connected to the 3rd and 11th main grid lines 10, and when the laser 5 outputs laser radiation to irradiate the photovoltaic cell 1, it can be scanned and irradiated on the photovoltaic cell 1, the 5th to 9th main grid lines 10 and the 12th to 16th main grid lines 10. Thus, the first laser sintering process is completed; in the second laser sintering process, the two probe rows 3 can be respectively connected to the 6th and 14th main grid lines 10, and at this time the laser 5 outputs laser beams which should scan and irradiate the 1st to 5th main grid lines 10 and the 8th to 12th main grid lines 10. Thus, the second laser sintering process is completed; obviously, although the laser beams in the above two laser sintering processes scan and irradiate the photovoltaic cell 1 in areas that do not completely cover the entire photovoltaic cell 1, the areas scanned and irradiated by the laser beams in the two laser sintering processes together can completely cover the entire surface of the photovoltaic cell 1, thereby achieving complete sintering and repair of the entire surface of the photovoltaic cell 1.

[0042] Based on the above embodiment, the laser 5 in this embodiment needs to scan and irradiate two mutually spaced areas on the photovoltaic cell 1 when scanning and irradiating the photovoltaic cell 1. Therefore, in order to ensure the efficiency of laser sintering of the photovoltaic cell 1, the laser 5 used in this embodiment can be a laser light source that can simultaneously output two different laser beams; and the laser spots formed by the two laser beams on the photovoltaic cell 1 can each be a rectangular spot. In actual application, the laser 5 can be two identical area light sources, each of which can respectively scan and irradiate a laser beam that can form a rectangular spot on the photovoltaic cell 1; and the areas S of the laser spots formed by the two laser beams output by the laser 5 on the photovoltaic cell 1 each satisfy the light source 0.25S0<S≤0.33S0, S0 being the area of the photovoltaic cell.

[0043] Specifically, as shown in Figure 2 each rectangular spot output by the laser 5 has a size in the X direction equal to the size of the photovoltaic cell 1 in the X axis direction, and a size in the Y direction equal to one fourth to one third of the size of the photovoltaic cell in the Y axis direction, i.e. the area S of the rectangular spot is one fourth to one third of the area S0 of the photovoltaic cell.

[0044] Of course, in actual application, it is also not excluded that the laser beams scanning the two different areas on the photovoltaic cell 1 are radiated by the same laser 5, as long as the laser beams radiated by the laser 5 can simultaneously irradiate the area between the two probe rows 3 and the area on the side with the largest area of the two probe rows 3 on the photovoltaic cell 1.

[0045] In the above Figure 2 In the embodiment shown in the figure, the distance between the two probe rows 3 is 8 times the distance between the adjacent two main grid lines 10, that is, the number of main grid lines 10 between the two probe rows 3 is 7; in actual application, the distance between the two probe rows 3 should be determined based on the actual size of the photovoltaic cell 1; in Figure 2 In the embodiment shown in the figure, the number of main grid lines 10 between the two probe rows 3 should be half of the total number of main grid lines 10 on the photovoltaic cell 1, or half of the total number of main grid lines 10 plus 1, or half of the total number of main grid lines 10 minus 1, etc., that is, the distance between the two probe rows 3 should be approximately equal to half of the area S0 of the photovoltaic cell 1, or equal to half of the area S0 of the photovoltaic cell 1 plus or minus one main grid line 10 distance (i.e. the distance between the adjacent two main grid lines 10); both can fully achieve the effect of laser-induced sintering on the photovoltaic cell 1.

[0046] Based on the above discussion, for photovoltaic cells 1 of different sizes, the distance between the two probe rows 3 that needs to be set may be different; therefore, in order to make the laser-induced sintering device more flexible to use, in an alternative embodiment of the present application, each probe row 3 can be independently moved and adjusted in the direction perpendicular to its length; specifically, in this embodiment, the two probe rows 3 are both arranged above the carrying platform 2 by hanging, when it is needed to control the main grid lines 10 on the photovoltaic cell 1 on the carrying platform 2 and the two probe rows 3 to be in contact and electrically connected with each other or to be separated from each other, the two probe rows 3 can be driven to move up and down by the hanging devices that hang the two probe rows 3; correspondingly, when it is needed to adjust the positions of the two probe rows 3 in the direction perpendicular to their lengths, the positions of the corresponding hanging devices can also be moved to control and achieve the adjustment. For example, the two hanging devices that connect the two probe rows 3 can both be arranged on a slide rail in a horizontal direction, and the slide rail is parallel to the length direction of the probe rows 3; by sliding the hanging devices on the slide rail, the positions of the probe rows 3 can be adjusted.

[0047] In addition, as Figure 2As shown, to realize the complete laser sintering process of the photovoltaic cell 1, two sintering processes are needed to be completed together; in the two sintering processes, the main grid lines 10 needed to be contacted and connected by the two probe rows 3 are not the same, and the areas on the photovoltaic cell 1 scanned and irradiated by the laser 5 are also not the same; in order to avoid the two probe rows 3 needing to be frequently adjusted back and forth in position in batch sintering of the same model of photovoltaic cell 1, and the laser beam output by the laser 5 needing to be frequently adjusted, resulting in that the control of the laser sintering process is too complex and tedious, in an alternative embodiment of the present application, the laser-induced sintering device can further comprise:

[0048] The number of the carrying platforms 2 is two; each of the carrying platforms 2 is configured with the laser 5 and the two probe rows 3; and the transfer device is further included for transferring the photovoltaic cell 1 between the two carrying platforms 2.

[0049] In the embodiment, two carrying platforms 2 are provided, and each of the carrying platforms 2 is configured with the corresponding laser 5 and the two probe rows 3; then in actual application, the first group of the carrying platform 2, the laser 5 and the two probe rows 3 can be used only to complete the first sintering process of the photovoltaic cell 1, and the second group of the carrying platform 2, the laser 5 and the two probe rows 3 can be used only to complete the second sintering process of the photovoltaic cell 1. That is, the photovoltaic cell 1 is first placed on the first carrying platform 2, the two probe rows 3 corresponding to the first carrying platform 2 are lowered to be in contact with the main grid lines 10 on the photovoltaic cell 1, and the external power supply 4 is started to provide the power supply voltage and the laser 5 outputs the laser beam, so that the first sintering repair is completed. Then the two probe rows 3 above the first carrying platform 2 are raised, and the transfer device is used to transfer them to the second carrying platform 2. The two probe rows 3 above the second carrying platform 2 are lowered, and the second sintering repair process is realized in a similar way. In the same way, a large number of photovoltaic cells 1 can be placed on the two carrying platforms 2 in a pipeline manner for sintering repair. Only the lifting control of the two probe rows 3 and the transfer of the photovoltaic cell 1 by the transfer device are needed in the whole process, without any adjustment of the position of the probe rows 3 in the horizontal direction and the adjustment of the light beam output by the laser 5, so as to ensure the efficiency of the batch sintering repair of the photovoltaic cell 1.

[0050] Based on any of the above embodiments, referring to Figure 2 In an alternative embodiment of the present application, in the laser-induced sintering device, the probe row 3 includes a strip-shaped row plate 32; a plurality of probes 31 are arranged along the length direction of the strip-shaped row plate 32; the plurality of probes 31 are arranged in two rows and in a zigzag shape; one end of the strip-shaped row plate 32 and each probe 31 is electrically connected, and the other end of the probe 31 is used to contact the photovoltaic cell 1;

[0051] wherein, in the X direction, the distance L2 between two probes 31 staggered with each other in the two rows of probes 31 satisfies: 0.5D≤L2≤D, wherein D is the width of each probe 31 in the Y direction, the Y direction is perpendicular to the length direction of the strip-shaped array plate 32, and the X direction is parallel to the length direction of the strip-shaped array plate 32.

[0052] With reference to Figure 3 The two rows of probes 31 are arranged in parallel on the strip-shaped array plate 32, and the two rows of probes 31 are linearly arranged in the X direction and staggered in a zigzag manner. The distance L2 between the straight lines where the centers of the two rows of probes 31 are located satisfies 0.5D≤L2≤D, that is, one probe 31 in each row is partially inserted into the gap between two adjacent probes 31 in the other row. In addition, the strip-shaped array plate 32 should also be provided with a conductive connecting piece electrically connected between each probe 31, and each probe 31 is electrically connected to an external power source through the conductive connecting piece.

[0053] In the embodiment, two rows of probes 31 are arranged side by side on each probe row 3, so that the width D of the arrangement area of all the probes 31 on the entire probe row 3 in the Y direction can be increased to a certain extent, that is, the width of the arrangement area of the probes 31 in the Y direction is increased. Thus, when the probe row 3 is pressed on the main grid line 10, even if there is a certain positional deviation of the probe row 3 in the direction perpendicular to the length direction of the main grid line 10, the sufficient contact connection between the probes 31 and the main grid line 10 can still be ensured.

[0054] In addition, the two rows of probes 31 are staggered in a zigzag manner, that is, each probe 31 in one row of probes 31 is directly opposite the gap between two adjacent probes 31 in the other row of probes 31, so that the arrangement density of the probes 31 in a certain direction can be increased to a certain extent. On this basis, the distance L2 between the two rows of probes 31 should be greater than the width D of each probe 31 in the Y direction and less than half the width D of each probe 31 in the Y direction. As can be seen, at least part of each row of probes 31 is inserted between two probes 31 in the other row of probes 31, so that the two rows of probes 31 have a certain overlapping section in the Y direction, thereby avoiding the problem of insufficient contact area between the main grid line 10 and the probes 31 when the main grid line 10 is located in the boundary region between the two rows of probes 31.

[0055] In addition, in the same row of probes 31, the size of each probe 31 in the X direction should also be smaller than the size of the gap between the two adjacent probes 31 in the X direction, so that when the probe row 3 and the main grid line 10 are perpendicular to each other, the main grid line 10 will not be clamped into the gap between the two adjacent probes 31.

[0056] On this basis, in order to further ensure that the probe 31 and the main grid line 10 can maintain good contact, the probe 31 in the embodiment can be a flat structure of a conductive column, and the size of the conductive column in the X direction is smaller than the size in the Y direction. Figure 3 Figure 3 In the embodiment shown, the probe 31 can be an elliptical conductive column with the short axis direction and the X direction being parallel to each other; in actual application, the probe 31 in the application can also adopt a rectangular conductive sheet in the Y direction; the probe 31 in the embodiment can also adopt other structural shapes, which are not enumerated one by one in the embodiment.

[0057] As described above, in actual application, the model types of the photovoltaic cell 1 required to be repaired by laser sintering in the application are different, and therefore the lengths of the main grid line 10 on the photovoltaic cell 1 are also different; for this purpose, in an alternative embodiment of the embodiment, the probe row 3 can further include:

[0058] The strip-shaped row plate 32 is provided with two rows of a plurality of insertion holes arranged in parallel and staggered, and the plurality of insertion holes and the plurality of probes 31 are one-to-one corresponding, and the probe 31 is detachably inserted into the insertion hole.

[0059] In the embodiment, two rows of insertion holes are further provided on each strip-shaped row plate 32, and each insertion hole is used for inserting a probe 31, so that the arrangement mode of the two rows of insertion holes and the arrangement mode between the probes 31 are the same, so that each probe 31 can be detachably connected with the strip-shaped row plate 32 through the insertion hole, on the one hand, different numbers of probes 31 can be selectively arranged on the strip-shaped row plate 32 in actual application based on the length of the main grid line 10 on the photovoltaic cell 1, and on the other hand, the probe 31 can be more conveniently detached and replaced when the probe 31 fails.

[0060] In actual application, each probe 31 can be a pluggable connection with the insertion hole or a threaded screw connection; on this basis, each probe 31 needs to be electrically connected with the conductive connecting piece arranged on the strip-shaped row plate 32, and in an alternative implementation manner of the embodiment, a conductive layer electrically connected with the conductive connecting piece can be arranged on the hole wall of each insertion hole; specifically, the conductive connecting piece can also be a conductive metal strip press-fitted on the strip-shaped row plate 32, and the conductive layer in each insertion hole can be a conductive ring integrally formed with the conductive metal strip, when the end portion of each probe 31 is inserted into the insertion hole, the end portion is also inserted into the conductive ring to be attached and connected with the conductive ring, that is, the electrical connection between the probe 31 and the conductive metal strip is realized.

[0061] Further optionally, the conductive connecting piece in the embodiment can be integrally formed with each probe 31 on the basis of the conductive metal strip; correspondingly, the jack on the strip-shaped array plate 32 should be a through-hole structure, whereby the end of each probe 31 away from the conductive metal strip is inserted through the jack and exposed from the other end of the strip-shaped array plate 32, and then the conductive connecting piece and the strip-shaped array plate 32 are fixed, that is, the detachable connection between the probe 31 and the strip-shaped array plate 32 can be achieved. Of course, it can be understood that, because the probe 31 and the conductive connecting piece are integrally formed, in actual application, an integrally formed structure (i.e., the probe 31 and the conductive connecting piece are integrally formed) with different numbers of probes 31 should be configured to adapt to different models of photovoltaic cell pieces 1.

[0062] In addition, the number of probes 31 provided on the strip-shaped array plate 32 can be between 28 pairs and 32 pairs, that is, the number of probes 31 in each row is 28 to 32, and the total number of probes 31 is 56 to 64; correspondingly, the number of jacks provided on the strip-shaped array plate 32 should also be not less than 28 pairs.

[0063] In summary, in the laser-induced sintering device of the present application, two probe arrays parallel to each other are provided above the bearing platform, whereby in the process of LIF laser-induced sintering of the photovoltaic cell piece, the two probe arrays can connect the main grid lines from two different area positions on the photovoltaic cell piece and apply a power supply voltage, thereby injecting more carriers into the photovoltaic cell piece, avoiding the problem of insufficient number of carriers in the area of the photovoltaic cell piece far away from the probe array, making the number of carriers on the entire photovoltaic cell piece more sufficient and uniformly distributed, at the same time, using the laser to irradiate the photovoltaic cell piece, the entire photovoltaic cell piece can be more fully sintered and repaired, to a great extent, avoiding the problems of EL black edge and half-cut grid of the photovoltaic cell piece, effectively ensuring the effect of laser-induced sintering of the photovoltaic cell piece.

[0064] It should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Additionally, the above technical solutions provided by the embodiments of the present application have not been described in detail, as the principles of the corresponding technical solutions in the prior art are consistent.

[0065] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method and core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A laser-induced sintering apparatus, characterized in that, Applied to laser-induced sintering of photovoltaic cells, it includes a carrying platform for carrying photovoltaic cells; two mutually parallel probe rows arranged above the carrying platform and electrically connected to an external power supply; a laser arranged above the carrying platform; In the direction perpendicular to the length direction of the probe row, the distance H between the two probe rows is not less than one-fourth of the length dimension L1 of the photovoltaic cell; the probe row is used to contact the main grid lines on the photovoltaic cell parallel or perpendicular to each other, so as to apply a power supply voltage to the main grid lines simultaneously; The laser is used to perform laser scanning irradiation on the surface of the photovoltaic cell.

2. The laser-induced sintering apparatus as described in claim 1, characterized in that, In the direction perpendicular to the length direction of the probe row, the positions of the two probe rows can be independently adjusted.

3. The laser-induced sintering apparatus as described in claim 1, characterized in that, The probe row includes a strip-shaped row plate, and a number of probes are arranged along the length direction of the strip-shaped row plate; the number of the probes is arranged in two rows and staggered in a zigzag pattern; the strip-shaped row plate is electrically connected to one end of each probe, and the other end of the probe is used to contact the photovoltaic cell; Wherein, in the X direction, the distance L2 between two mutually staggered probes in the two rows of probes satisfies: 0.5D ≤ L2 ≤ D, where D is the width of each probe in the Y direction, the Y direction is perpendicular to the length direction of the strip-shaped row plate, and the X direction is parallel to the length direction of the strip-shaped row plate.

4. The laser-induced sintering apparatus as described in claim 3, characterized in that, Each probe is a conductive column, and the dimension of the conductive column in the X direction is smaller than the dimension in the Y direction.

5. The laser-induced sintering apparatus as described in claim 3, characterized in that, The strip-shaped row plate is provided with two rows of a number of mutually parallel and staggered jacks, and the number of the jacks corresponds to the number of the probes one by one, and the probes are detachably inserted into the jacks.

6. The laser-induced sintering apparatus as described in claim 5, characterized in that, A conductive layer is provided on the inner wall of the jack.

7. The laser-induced sintering apparatus as described in claim 3, characterized in that, Each probe row contains 56 to 64 of the probes.

8. The laser-induced sintering apparatus as described in claim 1, characterized in that, The laser is a light source that can simultaneously output two laser beams, and is used to perform laser scanning on the surface of the photovoltaic cell; wherein, one laser beam irradiates the area M between the two probe rows, and the other laser beam irradiates the area N on one side of the probe row and far from the area M.

9. The laser-induced sintering apparatus as described in claim 8, characterized in that, The laser is a light source whose laser spot area S formed by the two output laser beams on the photovoltaic cell satisfies 0.25S0 < S ≤ 0.33S0; S0 is the area of the photovoltaic cell.

10. The laser-induced sintering apparatus according to any one of claims 1 to 9, characterized in that, The number of the carrying platforms is two; each carrying platform is equipped with the laser and two probe rows; It further includes a transfer device for transferring the photovoltaic cell between the two carrying platforms.

Images