Laser-assisted sintering method and laser-assisted sintering device

Abstract

The invention provides a laser-assisted sintering method and a laser-assisted sintering device.According to the laser-assisted sintering method, the laser switch delay is set in the laser, so that a signal source in the laser gives a switch signal in advance, the laser scanning work starting laser delay is increased by the first delay duration, and the laser-assisted sintering effect of all positions of a battery piece is guaranteed; the generation of abnormal solar cells is reduced, and the customer satisfaction is improved.

Description

Technical Field

[0001] This application relates to the technical field of solar cell preparation, and particularly to a laser-assisted sintering method and a laser-assisted sintering device. Background Art

[0002] During the production process of solar cell modules, abnormal phenomena such as blackening in the middle area are likely to occur during the EL test of the series-connected cell sheets at the photovoltaic module end. However, when testing a single cell sheet at the cell end, the blackened area is relatively blurred, and it is impossible to accurately control and identify abnormal cell sheets well, which affects production efficiency and the production quality of solar cell modules. Summary of the Invention

[0003] In the first aspect of this application, a laser-assisted sintering method is provided. A laser switch delay is set in the laser so that the signal source in the laser gives a switch-on signal in advance, and the starting laser delay of the laser scanning operation increases by a first delay duration.

[0004] In some alternative embodiments of the first aspect of this application, the first delay duration is 100 ms to 200 ms.

[0005] In some alternative embodiments of the first aspect of this application, the first delay duration is 110 ms, 120 ms, 130 ms, 140 ms, 150 ms, 160 ms, 170 ms, 180 ms, 190 ms or 200 ms.

[0006] In some alternative embodiments of the first aspect of this application, the two starting endpoints of the first delay duration range are any two of 110 ms, 120 ms, 130 ms, 140 ms, 150 ms, 160 ms, 170 ms, 180 ms, 190 ms and 200 ms.

[0007] In some alternative embodiments of the first aspect of this application, the first delay duration is 100 ms.

[0008] In some alternative embodiments of the first aspect of this application, the original starting laser delay in the starting laser delay is 10 ms to 40 ms.

[0009] In some alternative embodiments of the first aspect of this application, the original starting laser delay is 30 ms to 40 ms.

[0010] In some alternative embodiments of the first aspect of this application, the total starting laser delay duration in the starting laser delay is 110 ms to 240 ms.

[0011] In some alternative embodiments of the first aspect of this application, it includes:

[0012] Conveying a solar cell into a laser-assisted sintering device and placing the cell on a conductive plate, the solar cell having a region to be sintered;

[0013] Voltage applying step: controlling the positive conductive structure and the negative conductive structure connected to the external power supply in the voltage applying component to abut against the conductive plate and the solar cell respectively, and applying voltage through the external power supply to form a complete current return through the conductive plate and the solar cell;

[0014] Laser scanning step: When an external power source applies voltage, the laser is controlled to generate a laser beam, and the laser beam is scanned over the area to be sintered to form a sintering area.

[0015] In some optional embodiments of the first aspect of the present application, the area to be sintered includes a first area to be sintered and a second area to be sintered which are adjacently arranged side by side;

[0016] Performing a voltage application step on the second area to be sintered, and performing a laser scanning step on the first area to be sintered to form a first sintering area;

[0017] Then, a voltage applying step is performed in the first sintering region, and a laser scanning step is performed in the second to-be-sintered region to form a second sintering region.

[0018] In some optional embodiments of the first aspect of the present application, two side-by-side conductive plates are provided in the laser-assisted sintering device, and each conductive plate corresponds to a voltage applying component.

[0019] One of the two conductive plates forms a first area corresponding to the first area to be sintered and a second area corresponding to the second area to be sintered, and a voltage applying component is arranged at a position corresponding to the second area;

[0020] The other of the two conductive plates forms a third area corresponding to the first sintering area and a fourth area corresponding to the second area to be sintered, and the other voltage applying component is arranged at a position corresponding to the third area;

[0021] One of the two conductive plates is rotated 90 degrees on a two-dimensional plane and then overlaps with the other of the two conductive plates, so that the first area overlaps with the third area correspondingly, and the second area overlaps with the fourth area correspondingly.

[0022] In some optional embodiments of the first aspect of the present application, after the solar cell forms a first sintering area on one of the two conductive plates, the solar cell is rotated ninety degrees on a two-dimensional plane and then transported to the other of the two conductive plates.

[0023] A second sintered region is formed on the other of the two conductive plates.

[0024] In some alternative embodiments of the first aspect of the present application, the positive electrode conductive structure in the voltage application component includes a positive electrode probe row, and the negative electrode conductive structure includes a negative electrode probe row. The positive electrode probe row and the negative electrode probe row are arranged in parallel with each other.

[0025] In the step of applying voltage:

[0026] The positive electrode probe row abuts against the conductive plate;

[0027] The negative electrode probe row abuts against the main grid on the solar cell, and the extending direction of the main grid is the same as the extending direction of the negative electrode probe row.

[0028] In some alternative embodiments of the first aspect of the present application, the negative electrode conductive structure includes a spaced-apart negative electrode first probe row and a negative electrode second probe row.

[0029] In some alternative embodiments of the first aspect of the present application,

[0030] There are at least 4 main grids spaced between the negative electrode first probe row and the negative electrode second probe row;

[0031] In some alternative embodiments of the first aspect of the present application, in the step of applying voltage:

[0032] The negative electrode first probe row abuts against the first main grid closest to the positive electrode probe row, and the negative electrode second probe row abuts against the sixth main grid.

[0033] The second aspect of the present application provides a laser-assisted sintering device, including:

[0034] A conductive plate for placing a solar cell;

[0035] A voltage application component arranged above the conductive plate for applying voltage to the solar cell, including a positive electrode conductive structure and a negative electrode conductive structure. Among them, the positive electrode conductive structure and the negative electrode conductive structure, the positive electrode conductive structure includes a positive electrode probe row, and the negative electrode conductive structure includes two spaced-apart negative electrode first probe rows and a negative electrode second probe row.

[0036] Beneficial effects:

[0037] Set a laser switch delay in the laser to enable the signal source in the laser to give the switch signal in advance, ensuring the stability of the voltage applied to the laser when the laser beam emitted by the laser starts to scan the solar cell during the laser sintering process. Thus, when laser scanning is performed on the area to be sintered on the solar cell, charge carriers are effectively excited everywhere in the area to be sintered, especially at the starting position of the laser scan. Combining with the action of the applied voltage, an effective local current is formed. The local current corresponds to the sintering process at the corresponding location, effectively promoting the mutual diffusion of silver and silicon, thereby significantly reducing the contact resistance between the metal and the semiconductor of the solar cell and improving the fill factor. Ensure that everywhere in the area to be sintered after laser scanning is effectively optimized by the laser-assisted sintering technology, improving the efficiency of the overall solar cell, and avoiding the situation where the EL test of the series-connected solar cells at the photovoltaic module end turns black in the middle area and has uneven brightness due to different laser-assisted sintering effects at different locations of a single solar cell during the EL test. Reduce the generation of abnormal solar cells, improve the quality of the solar cells after laser sintering, avoid abnormal feedback from downstream customers, and enhance customer satisfaction. Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the positional relationship between the laser-assisted sintering device and the solar cell before laser scanning in the laser-assisted sintering method provided by the embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of the solar cell on two different conductive plates of the laser-assisted sintering device after laser scanning in the laser-assisted sintering method provided by the embodiment of the present application.

[0041] Description of the reference numerals:

[0042] Conductive plate - 1;

[0043] First area to be sintered - A1; First sintered area - A11; Second area to be sintered - A2; Second sintered area - A21;

[0044] First area - B1; Second area - B2; Third area - B3; Fourth area - B4;

[0045] Voltage application component - 2;

[0046] Positive electrode probe row - 21; Negative electrode first probe row - 22; Negative electrode second probe row - 23;

[0047] Main grid - 5. Specific implementation mode

[0048] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0049] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0050] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0051] In addition, the technical features involved in different implementation modes of the present application described below can be combined with each other as long as they do not conflict with each other.

[0052] As one of the decisive forces in energy transformation and the implementation of the energy production and consumption revolution, cost reduction and efficiency improvement of photovoltaic products are the basis for China to achieve grid parity in the photovoltaic industry. High-efficiency and low-cost crystalline silicon cells are the development direction of the photovoltaic industry. The laser-assisted sintering process essentially separates the two key steps of passivation layer erosion and contact formation during high-temperature sintering by utilizing the highly concentrated and controllable characteristics of laser energy, thereby achieving further precise control of the sintering process. In principle, the current formed by the laser travels along the path with low contact resistance, triggering silver-silicon interdiffusion and thus reducing the contact resistance. The duration of the entire sintering process matches the carrier lifetime, and it stops quickly after the laser passes, thereby achieving the maximum retention of the original passivation layer and avoiding carrier recombination caused by direct contact between the metal and the silicon substrate. The matching of the sintering process with the light injection process improves the activation of hydrogen atoms on the surface of the cell to a certain extent, making the surface passivation effect better and improving the conversion efficiency. The principle of laser induction also utilizes the effect of light energy. Therefore, simply matching the metallization process (sintering process) with the induced laser for process optimization can achieve the purpose of cost reduction and efficiency improvement.

[0053] The working principle of LECO (laser-assisted sintering) is that high-intensity laser irradiates the cell to excite charge carriers, and at the same time, a deflection voltage of more than 10V is applied, generating a local current of several amperes, and sintering occurs at the corresponding location, triggering the mutual diffusion of silver paste and silicon, significantly reducing the contact resistance between the metal and the semiconductor, and thus increasing the fill factor.

[0054] The inventor found through research that the abnormal-quality wafers all showed blackening in the middle area in the series EL performance at the module end, but the blackening area was relatively blurred when testing a single wafer EL at the cell end. The reason that could not be controlled and identified was that the laser was missed. During the laser-assisted sintering process, due to the unstable voltage of the laser or the failure to apply pressure in a timely manner when the laser started scanning, the local current that could promote the mutual diffusion of the paste and silicon was not generated in the solar cell facing the laser, and it could not play the role of assisting sintering. As a result, the effect of the laser-assisted sintering process was poor, and the overall cell efficiency of the solar cell could not be effectively improved.

[0055] This application provides a laser-assisted sintering method, which sets a laser switch delay in the laser to enable the signal source in the laser to give the switch signal in advance, and the starting laser delay of the laser scanning operation increases by a first delay time.

[0056] Set a laser switch delay in the laser and add a first delay duration to the initial laser delay, so that the signal source in the laser gives the switch signal in advance, ensuring the stability of the voltage applied to the laser when the laser beam emitted by the laser starts to scan the cell during the laser sintering process. Thus, when laser scanning the area to be sintered on the solar cell, charge carriers can be effectively excited everywhere in the area to be sintered, especially at the starting position of the laser scan. Combining with the action of the applied voltage, an effective local current is formed, and sintering occurs at the corresponding position of the local current, effectively promoting the mutual diffusion of silver and silicon, thereby significantly reducing the contact resistance between the metal and the semiconductor of the solar cell and improving the fill factor. Ensure that everywhere in the area to be sintered after laser scanning is effectively optimized by the laser-assisted sintering technology, improving the efficiency of the overall solar cell, and avoiding the situation where the EL test of the series-connected cells at the photovoltaic module end shows blackening in the middle area and uneven brightness due to different laser-assisted sintering effects at different parts of a single solar cell during the EL test. Reduce the generation of abnormal solar cells, improve the quality of the cells after laser sintering, avoid abnormal feedback from downstream customers, and enhance customer satisfaction.

[0057] In some alternative embodiments of the present application, the first delay duration is 100 ms to 200 ms.

[0058] In some alternative embodiments of the present application, the first delay duration is 110 ms, 120 ms, 130 ms, 140 ms, 150 ms, 160 ms, 170 ms, 180 ms, 190 ms or 200 ms.

[0059] In some alternative embodiments of the present application, the two starting endpoints of the first delay duration range are any two of 110 ms, 120 ms, 130 ms, 140 ms, 150 ms, 160 ms, 170 ms, 180 ms, 190 ms and 200 ms.

[0060] In some alternative embodiments of the present application, the original initial laser delay duration in the initial laser delay is 10 ms to 40 ms.

[0061] In some alternative embodiments of the present application, the original initial laser delay duration in the initial laser delay is 30 ms to 40 ms.

[0062] In some alternative embodiments of the present application, the total initial laser delay duration in the initial laser delay is 110 ms to 240 ms.

[0063] It should be noted that the total initial laser delay duration is equal to the sum of the original initial laser delay duration and the first delay duration.

[0064] In some embodiments of the present application, increasing the first delay duration can ensure the auxiliary sintering effect at various positions of the solar cell while maintaining the relatively fast production rhythm in the original efficient auxiliary sintering process, reduce the generation of abnormal solar cells, improve the quality of the cells after laser sintering, avoid abnormal feedback from downstream customers, and enhance customer satisfaction.

[0065] In some alternative embodiments of the present application, the first delay duration is 100 ms.

[0066] In some alternative embodiments of the present application, it includes:

[0067] S10: Convey the solar cell to the laser-assisted sintering device and place it on the conductive plate 1. The solar cell has a region to be sintered.

[0068] S20: Voltage application step: Control the positive conductive structure and the negative conductive structure connected to the external power supply in the voltage application component 2 to be in contact with the conductive plate 1 and the solar cell respectively, and apply a voltage through the external power supply to form a complete current return flow through the conductive plate 1 and the solar cell.

[0069] S30: Laser scanning step: While applying a voltage through the external power supply, control the laser to operate to generate a laser beam, and scan the region to be sintered with the laser beam to form a sintered region.

[0070] In some alternative embodiments of the present application, the region to be sintered includes a first region to be sintered A1 and a second region to be sintered A2 arranged adjacent to each other side by side.

[0071] Perform the voltage application step in the second region to be sintered A2, and perform the laser scanning step in the first region to be sintered A1 to form a first sintered region A11.

[0072] Then perform the voltage application step in the first sintered region A11, and perform the laser scanning step in the second region to be sintered A2 to form a second sintered region A21.

[0073] As Figure 1 shown, in some alternative embodiments of the present application, two side-by-side conductive plates 1 are provided in the laser-assisted sintering device, and each conductive plate 1 corresponds to a voltage application component 2.

[0074] One of the two conductive plates 1 forms a first region B1 corresponding to the first region to be sintered A1 and a second region B2 corresponding to the second region to be sintered A2, and one voltage application component 2 is arranged corresponding to the second region B2 in position.

[0075] The other of the two conductive plates 1 forms a third region B3 corresponding to the first sintered region A11 and a fourth region B4 corresponding to the second region to be sintered A2, and the other voltage application component 2 is arranged corresponding to the third region B3 in position.

[0076] If one of the two conductive plates 1 is rotated by 90 degrees in a two-dimensional plane and then overlaps with the other of the two conductive plates 1, the first region B1 and the third region B3 overlap correspondingly, and the second region B2 and the fourth region B4 overlap correspondingly.

[0077] In some optional embodiments of the present application, after a first sintering region A11 is formed on one of the two conductive plates 1, the solar cell is rotated by 90 degrees in a two-dimensional plane and then conveyed to the other of the two conductive plates 1.

[0078] A second sintering region A21 is formed on the other of the two conductive plates 1.

[0079] In these embodiments, in the laser-assisted sintering process, a solar cell is divided into two regions to be sintered. The first region to be sintered A1 and the second region to be sintered A2 are axisymmetric.

[0080] Figure 1 The purpose is to show the structure of the laser-assisted sintering device in the embodiments of the present application, the corresponding division of each region in the two conductive plates 1 before laser scanning, and the corresponding relationship between the solar cell and the divided regions in the two conductive plates 1. The situation of the sintering region formed after the solar cell is laser-scanned during the actual laser-assisted sintering process is not shown. On the left side of the observer in the figure is one of the two conductive plates 1, and on the right side of the observer is the other of the two conductive plates 1. Figure 1 The structure of the voltage application component 2 corresponding to one of the two conductive plates 1 on the left side of the observer is the same as the structure of the voltage application component 2 corresponding to the other of the two conductive plates 1 on the right side of the observer. Both are provided with a negative electrode first probe row 22, a negative electrode second probe row 23, and a positive electrode probe row 21. Here, for the sake of clear illustration, the schematic of the structure of the voltage application component 2 corresponding to one of the two conductive plates 1 on the left side is omitted.

[0081] Please refer to Figure 1 and Figure 2 , during the laser-assisted sintering process, first convey the solar cell to one of the two conductive plates 1 and place the solar cell on one of the two conductive plates 1.

[0082] The position of the first region to be sintered A1 in the solar cell corresponds to the first region B1. The first region B1 is set to extend beyond the first region to be sintered A1. The position of the second region to be sintered A2 corresponds to the second region B2. The second region B2 is set to extend beyond the second region to be sintered A2. The first region B1 and the second region B2 are also axisymmetrically arranged.

[0083] First voltage application step: The voltage application component 2 corresponding to the second region B2 presses down on the second sintering region A2 of the solar cell. The positive electrode conductive structure connected to the external power supply abuts against the second region B2 of the conductive plate 1, and the negative electrode conductive structure abuts against the second sintering region A2 of the solar cell. A complete current return flow through the conductive plate 1 and the solar cell is formed by applying voltage through the external power supply.

[0084] First laser scanning step: While applying voltage through the external power supply, control the laser to operate to generate a laser beam, and scan the first sintering region A11 with the laser beam to form the first sintering region A11. A laser switch delay is set in the laser to enable the signal source in the laser to give a switch signal in advance, and the starting laser delay of the laser scanning operation increases by a first delay duration.

[0085] Rotate the solar cell with the first sintering region A11 formed clockwise or counterclockwise by ninety degrees and then transport it to the other one of the two conductive plates 1, and place the solar cell on the other one of the two conductive plates 1. Since one of the two conductive plates 1 overlaps with the other one of the two conductive plates 1 after rotating ninety degrees in the two-dimensional plane, the first region B1 and the third region B3 overlap correspondingly, and the second region B2 and the fourth region B4 overlap correspondingly.

[0086] Therefore, the position of the first sintering region A11 on the other one of the two conductive plates 1 corresponds to the third region B3, and the position of the second sintering region A2 on the other one of the two conductive plates 1 corresponds to the fourth region B4.

[0087] Second voltage application step: The voltage application component 2 corresponding to the third region B3 presses down on the first sintering region A11 of the solar cell. The positive electrode conductive structure connected to the external power supply abuts against the third region B3 of the conductive plate 1, and the negative electrode conductive structure abuts against the first sintering region A11 of the solar cell. A complete current return flow through the conductive plate 1 and the solar cell is formed by applying voltage through the external power supply.

[0088] Second laser scanning step: While applying voltage through the external power supply, control the laser to operate to generate a laser beam, and scan the second sintering region A21 with the laser beam to form the second sintering region A21. A laser switch delay is set in the laser to enable the signal source in the laser to give a switch signal in advance, and the starting laser delay of the laser scanning operation increases by a first delay duration.

[0089] Complete the laser-assisted sintering work of the entire solar cell.

[0090] In some embodiments of the present application, the positive electrode conductive structure in the voltage application component 2 includes a positive electrode probe row 21, the negative electrode conductive structure includes a negative electrode probe row, and the positive electrode probe row 21 and the negative electrode probe row are arranged in parallel with each other.

[0091] During the voltage application step:

[0092] The positive electrode probe row 21 abuts against the conductive plate 1;

[0093] The negative electrode probe row abuts against the main grid 5 on the solar cell, and the extending direction of the main grid 5 is the same as the extending direction of the negative electrode probe row.

[0094] The inventor further found that during the long-term use of the laser-assisted sintering device, the probes in the probe row are worn due to long-term contact, and the contact performance will deteriorate accordingly, or the probes do not contact the main grid 5 of the battery cell firmly, so that a complete circuit cannot be formed, resulting in no current generation and no sintering effect.

[0095] In some embodiments of the present application, the negative electrode conductive structure includes a spaced-apart negative electrode first probe row 22 and a negative electrode second probe row 23. In these embodiments, adding a probe row can improve the contact performance between the probes and the main grid 5 of the battery cell, ensure that a stable voltage can be applied to the outside of the solar cell during the use of the laser-assisted device, ensure current generation, and play a sintering role.

[0096] In some embodiments of the present application, there are at least 4 main grids 5 spaced between the negative electrode first probe row 22 and the negative electrode second probe row 23;

[0097] In some embodiments of the present application, during the voltage application step:

[0098] The negative electrode first probe row 22 abuts against the first main grid 5 closest to the positive electrode probe row 21, and the negative electrode second probe row 23 abuts against the sixth main grid 5.

[0099] The probe row, the probes, and the conductive plate 1 are made of the metal "copper", and their electrical conductivity and thermal conductivity are superior to other metals in terms of comprehensive consideration.

[0100] The positive electrode first probe row and the negative electrode probe row are each designed with 52 probe holes for installing probes; currently, the length of the probe row can be compatible with models of lengths 185 mm and 199 mm, with better flexibility.

[0101] The second aspect of the present application provides a laser-assisted sintering device, including:

[0102] A conductive plate 1 for placing a solar cell;

[0103] A voltage application assembly 2, arranged above the conductive plate 1, for applying a voltage to the solar cell, including a positive electrode conductive structure and a negative electrode conductive structure, wherein the positive electrode conductive structure and the negative electrode conductive structure, the positive electrode conductive structure includes a positive electrode probe row 21, and the negative electrode conductive structure includes two spaced-apart negative electrode first probe rows 22 and negative electrode second probe rows 23.

[0104] The laser-assisted sintering device provided in the second aspect of the present application is provided with two negative probe rows in the negative conductive structure, which further ensures the stability of the applied voltage during the laser-assisted sintering process, and thus ensures the quality of laser-assisted sintering.

[0105] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A laser-assisted sintering method, characterized in that, A laser opening delay is set in the laser so that the signal source in the laser gives an opening signal in advance, and the laser delay at the start of the laser scanning operation increases by a first delay time.

2. The laser-assisted sintering method according to claim 1, wherein The first delay time is 100ms to 200ms. Preferably, the first delay time is 110ms, 120ms, 130ms, 140ms, 150ms, 160ms, 170ms, 180ms, 190ms or 200ms; Preferably, the two starting endpoints of the first delay time range are any two of 110ms, 120ms, 130ms, 140ms, 150ms, 160ms, 170ms, 180ms, 190ms and 200ms; Preferably, the first delay duration is 100ms; Preferably, the original starting laser delay in the starting laser delay is 10ms to 40ms; Preferably, the original starting laser delay time is 30ms to 40ms; Preferably, the total duration of the starting laser delay in the starting laser delay is 110 ms to 240 ms.

3. The laser-assisted sintering method according to claim 1, wherein include: Conveying a solar cell sheet into a laser-assisted sintering device and placing the sheet on a conductive plate, the solar cell sheet having a region to be sintered; Voltage applying step: controlling the positive conductive structure and the negative conductive structure connected to the external power supply in the voltage applying component to abut against the conductive plate and the solar cell respectively, and applying voltage through the external power supply to form a complete current return flowing through the conductive plate and the solar cell; Laser scanning step: while applying voltage to the external power supply, controlling the laser to work and generate a laser beam, and making the laser beam scan the area to be sintered to form a sintering area.

4. The laser-assisted sintering method according to claim 3, characterized in that: The area to be sintered comprises a first area to be sintered and a second area to be sintered which are adjacently arranged side by side; The voltage applying step is performed on the second area to be sintered, and the laser scanning step is performed on the first area to be sintered to form a first sintering area; The voltage applying step is then performed in the first sintering region, and the laser scanning step is performed in the second to-be-sintered region to form a second sintering region.

5. The laser-assisted sintering method according to claim 4, wherein The laser-assisted sintering device is provided with two conductive plates arranged side by side, each conductive plate corresponds to a voltage applying component, One of the two conductive plates forms a first area corresponding to the first area to be sintered and a second area corresponding to the second area to be sintered, and a voltage applying component is arranged corresponding to the second area; The other of the two conductive plates forms a third area corresponding to the first sintering area and a fourth area corresponding to the second area to be sintered, and another voltage applying component is arranged at a position corresponding to the third area; One of the two conductive plates overlaps with the other of the two conductive plates after being rotated 90 degrees on a two-dimensional plane, so that the first area overlaps with the third area correspondingly, and the second area overlaps with the fourth area correspondingly.

6. The laser-assisted sintering method according to claim 5, wherein After the solar cell forms the first sintering region on one of the two conductive plates, it is rotated 90 degrees in the two-dimensional plane and then conveyed to the other of the two conductive plates, and a second sintering region is formed on the other of the two conductive plates.

7. The laser-assisted sintering method according to claim 5, wherein In the voltage application assembly, the positive electrode conductive structure includes a positive electrode probe row, and the negative electrode conductive structure includes a negative electrode probe row. The positive electrode probe row and the negative electrode probe row are arranged in parallel with each other. In the voltage application step: The positive electrode probe row abuts against the conductive plate; The negative electrode probe row abuts against the main grid on the solar cell, and the extending direction of the main grid is the same as the extending direction of the negative electrode probe row.

8. The laser-assisted sintering method according to claim 7, wherein the negative electrode conductive structure includes a spaced-apart negative electrode first probe row and a negative electrode second probe row. Preferably, there are at least 4 main grids spaced between the negative electrode first probe row and the negative electrode second probe row.

9. The laser-assisted sintering method according to claim 8, wherein 9 In the voltage application step: The negative electrode first probe row abuts against the first main grid closest to the positive electrode probe row, and the negative electrode second probe row abuts against the sixth main grid.

10. A laser-assisted sintering device, characterized in that, Comprising: a conductive plate for placing a solar cell; a voltage application assembly disposed above the conductive plate for applying a voltage to the solar cell, including a positive electrode conductive structure and a negative electrode conductive structure. Among them, the positive electrode conductive structure and the negative electrode conductive structure, the positive electrode conductive structure includes a positive electrode probe row, and the negative electrode conductive structure includes two spaced-apart negative electrode first probe rows and a negative electrode second probe row.

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