Laser-assisted sintering device

Abstract

The utility model relates to the field of photovoltaic technology, and provides a laser-assisted sintering device which comprises a conductive station, a pressure applying assembly and a laser scanning locator, the table top of the conductive station bears the battery piece; the pressure applying assembly is of a suspension bridge type structure and comprises a conductive thin wire and a driving assembly. The laser scanning positioning instrument is in communication connection with the driving assembly so as to perform position positioning and laser scanning on the battery piece; the conductive thin wire and the conductive station are electrically connected with an external power supply; the conductive thin wire is located above the conductive station, and the two ends of the conductive thin wire are each connected with a mounting frame. And the driving assembly drives the mounting rack or the conductive station to move up and down, so that the conductive thin wires are far away from or in contact with the main grid of the battery piece, and the conductive thin wires and the conductive station can apply deflection voltage to the battery piece. According to the laser-assisted sintering device, operation can be simplified, the productivity can be improved, consumed time is short, replacement of the conductive thin wire is more time-saving and labor-saving, the cost is lower, the fragment risk can be reduced, and the rate of finished products can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field, concretely relates to a laser auxiliary sintering device. BACKGROUND

[0002] The laser auxiliary sintering technology is to make the metal (such as metal electrode or metal grid line) and the semiconductor (such as silicon surface) form better contact by irradiating the high-intensity laser on the photovoltaic cell piece (referred to as cell piece) and matching the deflection voltage of 10V and above, so as to improve the photoelectric conversion efficiency of the cell.

[0003] After the cell piece is screened by silk screen printing and sintering, it can enter the laser auxiliary sintering process. Fig. 1-2 As shown in the prior art laser auxiliary sintering method, the laser-deflection voltage mode is mainly divided into two steps: first, the probes of the first probe row are pressed on the main grid of the left side of the cell piece, and the laser scans the right half of the cell piece (such as the first laser scanning area shown in Fig. 1 second, the probes of the second probe row are pressed on the main grid of the right side of the cell piece, and the laser scans the left half of the cell piece (such as the second laser scanning area shown in Fig. 2 Thus, the laser auxiliary sintering of the whole cell piece can be completed. The laser-deflection voltage mode is divided into two-step laser scanning operation, and each step only scans half of the cell piece, because: the sum of the number of probes on the two probe rows is as high as 96, and when the probe row is in contact with the cell piece, it will block the laser, causing EL blackening phenomenon, which is not conducive to the improvement of the photoelectric conversion efficiency of the cell. However, this laser-deflection voltage mode has the following defects:

[0004] (1) The laser-deflection voltage mode needs to divide the scanning laser and the applied deflection voltage into two steps, and needs to complete the laser auxiliary sintering of one half of the cell piece first, and then complete the laser auxiliary sintering of the other half of the cell piece, which greatly affects the production capacity of the production line and leads to low production capacity.

[0005] (2) The number of probes of the probe row is large (at least 96 probes are inserted into the two probe rows), and the probe is a consumable, which consumes time and materials during maintenance.

[0006] (3) The large number of probes also causes multiple pressing points, which may cause a large risk of hidden cracks in the cell piece. INVENTION CONTENTS

[0007] The utility model aims at overcoming the defects of the prior art, and provides a laser auxiliary sintering device,

[0008] Based on this, the utility model discloses a kind of laser-assisted sintering devices, including conducting platform, pressure applying assembly and laser scanning positioner;The platform of conducting platform is used to carry battery piece;

[0009] The pressure applying assembly is suspension bridge type structure, including conducting fine wire and drive assembly;

[0010] The laser scanning positioner is located above conducting platform, and laser scanning positioner is connected with drive assembly in communication, to carry out position positioning and laser scanning to battery piece;

[0011] The conducting fine wire and conducting platform are electrically connected external power supply;The conducting fine wire is located above conducting platform, and the both ends of conducting fine wire are connected with a mounting bracket;The drive assembly is connected at least one mounting bracket or conducting platform, to make drive assembly drive mounting bracket or conducting platform to move up and down, to make conducting fine wire far away or contact the main grid of battery piece surface, so that conducting fine wire and conducting platform can exert deflection voltage to battery piece.

[0012] Preferably, the laser scanning area of the laser scanning positioner covers the surface of the entire battery piece;

[0013] When the pressure applying assembly exerts deflection voltage, the length direction of the conducting fine wire is consistent with the direction of the main grid of the battery piece;

[0014] The equivalent diameter of the conducting fine wire is 1 μm-1 mm;The conducting fine wire is gold wire, silver wire, copper wire or gold-plated copper wire.

[0015] Further preferably, the equivalent diameter of the conducting fine wire is 40-50 μm;The conducting fine wire is gold-plated copper wire.

[0016] Preferably, the side of the platform of the conducting platform is curved chamfer, to prevent short circuit caused by contacting the conducting platform when the conducting fine wire moves down.

[0017] Further preferably, the platform of the conducting platform is a curved platform, the curved platform is curved towards the battery piece, and the curvature of the curved platform is less than or equal to two-thirds of π, and the battery piece is attached to the curved platform.

[0018] Preferably, a kind of laser-assisted sintering device further includes a turntable;The conducting fine wire is located above the turntable, and the conducting platform is installed on the turntable, to make the conducting platform rotate by the turntable, to make the main grid of the battery piece on the conducting platform move to the lower side of the conducting fine wire.

[0019] Further preferably, the outer side of the turntable is sequentially provided with feeding area, laser-assisted sintering area and discharging area along the circumference;

[0020] The conductive platform is installed at the edge area of the rotary disc; one mounting frame is located at the laser-assisted sintering area outside the rotary disc, and the other mounting frame is installed at the middle area of the rotary disc; one end of the conductive fine wire extends to the mounting frame outside the rotary disc, and the other end of the conductive fine wire extends to the other mounting frame at the middle area of the rotary disc.

[0021] Preferably, the driving assembly comprises an induction driving part and a driving rod, two ends of the driving rod are connected with the induction driving part and the mounting frame respectively, so that the induction driving part drives the mounting frame to move up and down through the driving rod.

[0022] Further preferably, the mounting frame comprises a connecting rod and a mounting column; the driving rod is connected with the connecting rod, and two ends of the mounting column are connected with the ends of the conductive fine wire and the connecting rod respectively.

[0023] More preferably, the number of the conductive fine wires is less than or equal to 20; when the number of the conductive fine wires is multiple, the multiple conductive fine wires are distributed in sequence and at intervals, so as to respectively apply deflection voltages to different main grids on the battery piece; the number of the mounting columns on each mounting frame is the same as the number of the conductive fine wires.

[0024] Compared with the prior art, the utility model at least has the following beneficial effects:

[0025] 1、Compared with the probe row, the pressure applying assembly of the laser-assisted sintering device of the utility model is of a suspension bridge type structure, the equivalent diameter of the conductive fine wire thereof is small, the light shielding generated is small and can be basically ignored, and the laser-assisted sintering of the whole battery piece will not be affected. Therefore, only one step of operation is needed to scan the surface of the whole battery piece by using the laser scanning positioner; and it is not necessary to scan half of the battery piece each time as in the prior art disclosed in CN117650198A. Therefore, compared with the prior art such as CN117650198A, when the conductive fine wire contacts the main grid of the battery piece, the laser scanning positioner can realize one step of operation scanning, and the conductive fine wire will not bring negative effects of light shielding, so that the time consumption is short, and the production capacity can be increased by more than one time.

[0026] 2、The laser-assisted sintering device of the utility model does not need a probe row, but is designed as a pressure applying assembly of a suspension bridge type structure. The conductive fine wire of the pressure applying assembly is in line contact with the main grid of the battery piece, compared with the point contact of multiple probe rows with the main grid of the battery piece. The line contact can make the conductive fine wire press on the battery piece as a whole, so that each stress point on the surface of the battery piece is more uniform, and the phenomenon of local stress concentration will not occur, so that the risk of battery piece breakage can be greatly reduced, and the yield can be improved.

[0027] 3. Compared to the existing point contact multiple probes (two rows of probes filled with at least 96 probes), the number of conductive wires in line contact can be greatly reduced (in the best case, a pressure component with a suspension bridge structure formed by only one conductive wire can be used). Therefore, the replacement of conductive wires is more time-saving, labor-saving, and cost-effective. Attached Figure Description

[0028] Fig. 1 This is a schematic diagram of the first step in the existing laser-assisted sintering method: laser scanning and deflection voltage application.

[0029] Fig. 2 This is a schematic diagram of the second step of the existing laser-assisted sintering method: laser scanning and deflection voltage application.

[0030] Fig. 3 This is a schematic diagram of the structure of a laser-assisted sintering device according to this embodiment.

[0031] Fig. 4 This is a schematic diagram of the pressure application component in the downward pressure working state of this embodiment.

[0032] Fig. 5 A schematic diagram of the structure for using conductive wires in a suspension bridge-type pressure application assembly with an existing conductive platform.

[0033] Fig. 6 This is a schematic diagram of the structure of a conductive platform working in conjunction with a suspension bridge-type pressure application component according to this embodiment.

[0034] Fig. 7 This is a schematic diagram illustrating the operation of another conductive platform in this embodiment, combined with the conductive wires in the suspension bridge-type pressure application assembly.

[0035] Explanation of reference numerals: First probe row 001; Second probe row 002; Solar cell 003; Main grid 030; First laser scanning area 004; Second laser scanning area 005;

[0036] Conductive platform 1; Chamfered surface 11; Curved platform 12; Pressure application component 2; Conductive wire 21; Induction drive component 22; Drive rod 23; First mounting bracket 24; Second mounting bracket 25; Connecting rod 26; Mounting column 27; Laser scanning positioning device 3; Turntable 4; Feeding area 5; Feeding device 51; Laser-assisted sintering area 6; Unloading area 7; Unloading device 71. Detailed Implementation

[0037] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example

[0039] The laser-assisted sintering device of the embodiment, see Fig. 3-4 , comprising a rotating disc 4, a conductive platform 1, a pressure applying assembly 2 and a laser scanning positioner 3. Among them, the pressure applying assembly 2 is a suspension bridge structure, which includes a conductive fine wire 21, a mounting frame and a driving assembly (the driving assembly is an induction driving assembly, which includes an induction driving part 22 and a driving rod 23).

[0040] Among them, the laser scanning positioner 3 is located above the conductive platform 1, and the laser scanning positioner 3 is in communication connection with the induction driving part 22, so that the laser scanning positioner 3 can realize the position positioning and laser scanning effect of the battery piece 003.

[0041] Among them, the conductive fine wire 21 is located above the rotating disc 4, the conductive platform 1 is installed on the rotating disc 4, and the platform of the conductive platform 1 is used to carry the battery piece 003. The rotating disc 4 drives the conductive platform 1 to rotate along the horizontal plane (such as Fig. 3 indicated by the arrow, which can be counterclockwise rotation), so that the main grid 030 of the battery piece 003 on the conductive platform 1 is moved to the lower side of the conductive fine wire 21 by rotating, so that the conductive fine wire 21 and the conductive platform 1 can exert a deflection voltage on the battery piece 003.

[0042] Further, the conductive fine wire 21 and the conductive platform 1 are electrically connected to an external power supply. The conductive fine wire 21 is located above the conductive platform 1, and the two ends of the conductive fine wire 21 are connected to a mounting frame (such as Fig. 3-4 indicated by the arrow, which can be counterclockwise rotation), so that the main grid 030 of the battery piece 003 on the conductive platform 1 is moved to the lower side of the conductive fine wire 21 by rotating, so that the conductive fine wire 21 and the conductive platform 1 can exert a deflection voltage on the battery piece 003.

[0043] An example of the embodiment is that the first mounting frame 24 and the second mounting frame 25 are respectively connected to a driving assembly to drive the first mounting frame 24 and the second mounting frame 25 to move up and down, so that the two mounting frames drive the two ends of the conductive fine wire 21 to move away from (or contact) the main grid 030 on the surface of the battery piece 003. It should be noted that when the first mounting frame 24 and the second mounting frame 25 move upwards, the two ends of the conductive fine wire 21 move away from the surface of the battery piece 003, so that the rotation of the rotating disc 4 is not affected; when the first mounting frame 24 and the second mounting frame 25 move downwards, the two ends of the conductive fine wire 21 contact the main grid 030 on the surface of the battery piece 003, so that the conductive fine wire 21 and the conductive platform 1 can exert a deflection voltage on the surface of the battery piece 003.

[0044] To simplify the structure and reduce costs, another example of this embodiment is as follows: Fig. 3-4 As shown, only the first mounting bracket 24 is connected to a drive assembly, which moves the first mounting bracket 24 up and down to move the conductive wire 21 away from or in contact with the main grid 030 on the surface of the battery cell 003. This allows the conductive wire 21 and the conductive platform 1 to apply a deflection voltage to the battery cell 003 (for example, the conductive wire 21 and the conductive platform 1 are electrically connected to the negative and positive terminals of an external power source, respectively, and the conductive platform 1 is in electrical contact with the back of the battery cell 003, while the conductive wire 21 is in electrical contact with the main grid 030 on the front of the battery cell 003; thus, a deflection voltage can be applied to the battery cell 003). This example is a preferred embodiment; therefore, the following detailed description will use this preferred embodiment as an example.

[0045] Therefore, under the dual action of deflection voltage and laser scanning, a laser-assisted sintering process can be achieved on the entire solar cell 003, enabling better contact between the metal (such as metal electrodes or metal grid lines) and the semiconductor (such as silicon surface), improving the contact performance of the solar cell 003, and helping to improve the photoelectric conversion efficiency of the battery. In this embodiment, the laser scanning area of ​​the laser scanning positioning instrument 3 covers the entire surface of the solar cell 003; this is because: compared with the probe array, the equivalent diameter of the conductive fine wire 21 is smaller, and the light blocking generated is small and negligible, and will not affect the laser-assisted sintering of the entire solar cell 003; therefore, only one operation is needed to scan the entire surface of the solar cell 003 with the laser scanning positioning instrument 3, instead of two-step scanning as in the prior art publication CN117650198A, where only half of the solar cell 003 is scanned each time. Therefore, compared with the prior art such as CN117650198A, the laser-assisted sintering device of this embodiment can achieve one-step operation scanning, and the conductive fine wire 21 will not cause negative effects of light blocking, so the time consumption is short and the production capacity can be increased by more than double.

[0046] Specifically, the equivalent diameter of the conductive wire 21 is 1μm-1mm (e.g., 1μm, 3μm, 40μm, 50μm, 100μm, 500μm, 800μm, 995μm or 1mm); the equivalent diameter of the conductive wire 21 is preferably 40-50μm (more preferably 50μm). The conductive wire 21 is a gold wire, silver wire, copper wire or gold-plated copper wire (preferably gold-plated copper wire). Of course, in other examples, the conductive wire 21 can also be a wire of other materials with conductive properties.

[0047] like Fig. 3-4As shown, the drive assembly includes a sensing drive element 22 and a drive rod 23 (such as a threaded rod). The two ends of the drive rod 23 are connected to the sensing drive element 22 and the first mounting bracket 24, respectively, so that the sensing drive element 22 drives the first mounting bracket 24 to move up and down via the drive rod 23. Specifically, both the first mounting bracket 24 and the second mounting bracket 25 include a connecting rod 26 and a mounting post 27. The drive rod 23 is connected to the connecting rod 26 of the first mounting bracket 24, while the connecting rod 26 of the second mounting bracket 25 is mounted in the middle region of the turntable 4 (the turntable 4 includes a rotatable edge region and a stationary middle region); one end of the mounting post 27 is connected to the end of the conductive wire 21, and the other end of the mounting post 27 is connected to the connecting rod 26.

[0048] Specifically, the outer side of the turntable 4 is provided with a feeding area 5, a laser-assisted sintering area 6, and a discharging area 7 in sequence along the circumference. For example... Fig. 3 As shown, the loading area 5 and the unloading area 7 are equipped with external loading devices 51 and unloading devices 71.

[0049] like Fig. 3-4 As shown, the conductive stage 1 is installed in the edge area of ​​the turntable 4; the first mounting bracket 24 is located in the laser-assisted sintering area 6 outside the turntable 4, while the second mounting bracket 25 is installed in the middle area of ​​the turntable 4; one end of the conductive wire 21 extends to the outside of the turntable 4 and connects to the mounting post 27 of the first mounting bracket 24; while the other end of the conductive wire 21 extends to the middle area of ​​the turntable 4 and connects to the mounting post 27 of the second mounting bracket 25.

[0050] Thus, by mounting the connecting rod 26 of the second mounting bracket 25 in the middle area of ​​the turntable 4 (instead of mounting it on the outside of the turntable 4), the rotation of the edge area of ​​the turntable 4 will not be affected, and there is no need to excessively extend the length of the conductive wire 21. Therefore, it can reduce material consumption and make the conductive wire 21 more accurately aligned with the main grid 030 on the front of the battery cell 003 (the longer the conductive wire 21 is, the more difficult it is to align with the main grid 030 on the front of the battery cell 003).

[0051] In this embodiment, when the pressure applying component 2 applies the deflection voltage, the length direction of the conductive wire 21 is consistent with the direction of the main grid 030 of the solar cell 003. During the application of the deflection voltage, the conductive wire 21 and the main grid 030 of the solar cell 003 are in line contact. Compared with the point contact between the multiple pins and the main grid 030 of the solar cell 003 in the prior art such as CN117650198A, the line contact allows the conductive wire 21 to be pressed onto the solar cell 003 as a whole. The stress points on the surface of the solar cell 003 are more uniform, and there will be no local stress concentration. Therefore, it can greatly reduce the risk of fragmentation during the application of the deflection voltage to the solar cell 003 and improve the yield of laser-assisted sintering.

[0052] The number of conductive wires 21 is less than or equal to 20. When there are multiple conductive wires 21, the multiple conductive wires 21 are distributed sequentially at intervals (e.g., ...). Fig. 3-4 Three spaced conductive wires 21 are shown to apply deflection voltages to different main grids 030 on the cell 003, respectively; the number of mounting posts 27 on the first mounting bracket 24 (or the second mounting bracket 25) is the same as the number of conductive wires 21.

[0053] The conductive wire 21 is preferably one, and this conductive wire 21 only needs to make electrical contact with the main grid 030 in the middle of the solar cell 003. Compared with the probe array of the prior art, which requires multiple probes (at least 96 probes to be inserted in two rows of probe arrays), the laser-assisted sintering device of this embodiment only needs one conductive wire 21. Therefore, the replacement of the conductive wire 21 is more time-saving, labor-saving, and cost-effective.

[0054] In addition, the existing conductive stage 1, such as Fig. 5 As shown, the platform supporting the battery cell 003 is entirely planar, and the entire conductive platform 1 is cube-shaped or cuboid. However, this existing conductive platform 1 cannot be used in conjunction with the conductive wires 21 of the laser-assisted sintering apparatus in this embodiment. This is because, during the experiment, it was found that: Fig. 5 As shown, during the process of the induction drive 22 being driven by the drive rod 23 and the mounting bracket moving the conductive wire 21 downwards, in order to ensure that the conductive wire 21 can make close contact with the main grid 030 on the surface of the battery cell 003 to ensure conductivity, the end of the conductive wire 21 will inevitably form a shape on the side of the battery cell 003. Fig. 5 As shown at the stress point A, if the entire surface of the conductive platform 1 is flat, the end of the conductive wire 21 will easily form a force with the side of the conductive platform 1, such as... Fig. 5 The electrical contact point B shown causes a short circuit.

[0055] Therefore, to avoid short circuits and to ensure that the conductive stage 1 of this embodiment can be used in conjunction with the conductive wire 21 of the laser-assisted sintering device, this embodiment provides the following two schemes for the platform structure of the conductive stage 1:

[0056] Option 1: See Fig. 6 The platform area of ​​the conductive stage 1 that supports the battery cell 003 remains flat, while the remaining areas of the platform (such as the sides of the platform) are curved with chamfered edges 11. Thus, during the downward movement of the conductive wire 21 by the induction drive 22 via the drive rod 23 and the mounting bracket, to ensure close contact between the conductive wire 21 and the main grid 030 on the surface of the battery cell 003 to guarantee conductivity, the end of the conductive wire 21 will still form a chamfered edge on the side of the battery cell 003. Fig. 6 The stress point A is shown; however, due to the chamfered edge 11 on the side of the platform, it can provide a support for the end of the conductive wire 21, as shown in the figure.Fig. 6 The avoidance space C is shown, so that the short circuit problem caused by the contact between the conductive fine wire 21 and the conductive table 1 when the conductive fine wire 21 is lowered can be avoided.

[0057] Option two: refer to Fig. 7 , the table surface of the conductive table 1 is a curved table surface 12, and the curved table surface 12 is curved towards the battery piece 003 direction, so as to avoid the short circuit problem caused by the contact between the conductive fine wire 21 and the conductive table 1 when the conductive fine wire 21 is lowered. Specifically, the curvature of the curved table surface 12 is less than or equal to two-thirds of π (preferably less than or equal to one-third of π). In practice, the battery piece 003 is a planar structure, but the battery piece 003 can be normally curved to a certain curvature without being damaged; therefore, the battery piece 003 can be attached to the curved table surface 12, so as to not only ensure that the back surface of the battery piece 003 can be closely attached to the curved table surface 12, but also ensure that the conductive fine wire 21 can be more closely attached to the main grid 030 of the battery piece 003 when pressed. Preferably, the second option.

[0058] A laser-assisted sintering method of the embodiment is carried out by using the laser-assisted sintering device of the embodiment described above. The following takes the 7BB battery piece 003 as an example (7BB battery piece 003 refers to the grid line pattern of which there are 7 main grids 030), and details the process steps of the laser-assisted sintering method:

[0059] S1, the battery piece 003 is transmitted to the table surface of the conductive table 1 of the turntable 4 through the feeding area 5 by using the feeding device 51, and then the conductive table 1 is counterclockwise rotated (such as counterclockwise rotated by 90°) by the turntable 4, so as to transmit the battery piece 003 to the position below the conductive fine wire 21 (such as shown in Fig. 3 ).

[0060] S2, when the laser scanning positioner 3 positions the battery piece 003 to the corresponding position, the laser scanning positioner 3 transmits the positioning signal to the inductive driving part 22, so that the inductive driving part 22 drives the mounting frame (the first mounting frame 24 and / or the second mounting frame 25) to move downward through the driving rod 23, so as to make the mounting frame drive the conductive fine wire 21 to contact the main grid 030 on the surface of the battery piece 003, and form a pressing effect (see Fig. 4 , the direction indicated by the arrow is the direction of the downward movement of the first mounting frame 24 and the second mounting frame 25).

[0061] S3, the conductive table 1 and the conductive fine wire 21 are respectively electrically connected to the positive and negative poles of the external power supply, so that the conductive fine wire 21 and the conductive table 1 generate a potential difference through the power supply to apply a deflection voltage to the battery piece 003, and the laser scanning positioner 3 performs one-step operation laser scanning on the surface of the whole battery piece 003, so as to perform laser-assisted sintering on the battery piece 003.

[0062] S4, after the laser-assisted sintering is completed, the induction driving part 22 drives the mounting frame (the first mounting frame 24 and / or the second mounting frame 25) to move upward through the driving rod 23, so that the mounting frame drives the conductive fine wire 21 to move away from the surface of the battery piece 003, and the rotating disc 4 drives the conductive platform 1 to rotate counterclockwise (for example, 90° counterclockwise), so that the battery piece 003 is moved out of the laser-assisted sintering device through the discharging device 71 and the discharging area 7.

[0063] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art can make additional changes and modifications to these embodiments once the basic creative concept is known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0064] The above has carried out detailed introduction to the technical scheme provided by the utility model, the principle and implementation mode of the utility model have been described in the text by applying specific examples, the above embodiment explanation is only for helping understanding the method of the utility model and its core thought, simultaneously, for the general technical personnel of the field, according to the thought of the utility model, in specific implementation mode and application range will have the change of place, on the basis of the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A laser-assisted sintering apparatus, characterized in that, It includes a conductive platform, a pressure application component, and a laser scanning positioning device; the platform surface of the conductive platform is used to support the battery cells; The pressure-applying component is a suspension bridge structure, which includes conductive wires and a drive component; The laser scanning positioner is located above the conductive stage and is communicatively connected to the drive assembly to perform position positioning and laser scanning of the battery cells. Both the conductive wire and the conductive platform are electrically connected to an external power source; the conductive wire is located above the conductive platform, and both ends of the conductive wire are connected to a mounting bracket; the drive assembly is connected to at least one mounting bracket or conductive platform, so that the drive assembly drives the mounting bracket or conductive platform to move up and down, so that the conductive wire moves away from or contacts the main grid on the surface of the solar cell, so that the conductive wire and the conductive platform can apply a deflection voltage to the solar cell.

2. The laser-assisted sintering apparatus according to claim 1, characterized in that, The laser scanning area of ​​the laser scanning positioning device covers the entire surface of the battery cell; When the pressure-applying component applies a deflection voltage, the length direction of the conductive wire is consistent with the main grid direction of the battery cell; The equivalent diameter of the conductive wire is 1μm-1mm; the conductive wire is gold wire, silver wire, copper wire or gold-plated copper wire.

3. The laser-assisted sintering apparatus according to claim 2, characterized in that, The equivalent diameter of the conductive wire is 40-50 μm; the conductive wire is gold-plated copper wire.

4. The laser-assisted sintering apparatus according to claim 1, characterized in that, The sides of the conductive platform are curved and chamfered to prevent the conductive wire from contacting the conductive platform and causing a short circuit when it moves down.

5. A laser-assisted sintering apparatus according to claim 1 or 4, characterized in that, The conductive platform has a curved surface that bends toward the battery cell, and the curvature of the curved surface is less than or equal to half of π. The battery cell is attached to the curved surface.

6. The laser-assisted sintering apparatus according to claim 1, characterized in that, It also includes a turntable; the conductive wire is located above the turntable, and the conductive platform is mounted on the turntable so that the turntable drives the conductive platform to rotate, thereby moving the main grid of the battery cell on the conductive platform below the conductive wire.

7. The laser-assisted sintering apparatus according to claim 6, characterized in that, The outer side of the turntable is provided with a feeding area, a laser-assisted sintering area and a discharging area in sequence along the circumference; The conductive stage is installed on the edge area of ​​the turntable; one mounting bracket is located in the laser-assisted sintering area outside the turntable, while another mounting bracket is installed in the middle area of ​​the turntable; one end of the conductive wire extends to the outside of the turntable and connects to a mounting bracket, while the other end of the conductive wire extends to the middle area of ​​the turntable and connects to another mounting bracket.

8. The laser-assisted sintering apparatus according to claim 1, characterized in that, The drive assembly includes a sensor drive element and a drive rod. The two ends of the drive rod are respectively connected to the sensor drive element and the mounting frame, so that the sensor drive element drives the mounting frame to move up and down through the drive rod.

9. A laser-assisted sintering apparatus according to claim 8, characterized in that, The mounting frame includes a connecting rod and a mounting post; the drive rod is connected to the connecting rod, and the two ends of the mounting post are respectively connected to the end of a conductive wire and the connecting rod.

10. A laser-assisted sintering apparatus according to claim 9, characterized in that, The number of conductive wires is less than or equal to 20; when there are multiple conductive wires, the multiple conductive wires are distributed sequentially at intervals to apply deflection voltages to different main grids on the solar cell respectively; the number of mounting posts on each mounting bracket is the same as the number of conductive wires.

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