Solar cell laser sintering device

Abstract

The embodiment of the invention provides a solar cell laser sintering device, and the device comprises a laser source which is used for generating laser; the multiple probe rows are arranged at intervals in the first direction, an optical path is formed between every two adjacent probe rows, the top of each probe row is provided with a reflector, and the bottom of each probe row is provided with a plurality of probes; the reflector is used for reflecting the laser to the surface of the solar cell through the optical path; the probe is used for applying reverse bias voltage to the solar cell. According to the embodiment of the invention, the laser sintering of the back contact solar cell is realized, and the laser sintering difficulty of the solar cell is reduced.

Description

Technical Field

[0001] The present application relates to the field of solar cells, and in particular to a solar cell laser sintering device. Background Art

[0002] Metallization contact performance is one of the key bottlenecks limiting the improvement of solar cell conversion efficiency. Among them, the preparation device used to form the metallization contact of solar cells has an important influence on the conversion efficiency of solar cells. Therefore, how to improve the metallization sintering device and thus improve the electrical performance of solar cells has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to solve the above technical problems, the embodiment of the present application discloses a solar cell laser sintering device to realize laser sintering of solar cells.

[0004] The embodiment of the present application provides a solar cell laser sintering device, comprising: a laser source, the laser source is used to generate laser;

[0005] A plurality of probe rows, wherein the plurality of probe rows are arranged at intervals along a first direction, an optical path is formed between two adjacent probe rows, a reflector is disposed on the top of each probe row, and a plurality of probes are disposed on the bottom of each probe row;

[0006] The reflector is used to reflect the laser to the surface of the solar cell through an optical path;

[0007] The probe is used to apply a reverse bias voltage to the solar cell.

[0008] In some embodiments of the present application, along the first direction, the heights of the reflectors corresponding to the respective probe rows are sequentially reduced so that the laser can be emitted onto the reflectors corresponding to the respective probe rows.

[0009] In some embodiments of the present application, the laser source is used to generate multiple lasers, and each of the multiple lasers can be irradiated onto a corresponding reflector of the probe row.

[0010] In some embodiments of the present application, the laser source comprises:

[0011] The optical path derivative tube has a light outlet;

[0012] A laser is arranged in the optical path derivative tube;

[0013] A laser beam splitter is arranged in the optical path derivation tube and located at the light emitting side of the laser, and the light emitting port of the optical path derivation tube faces the reflector at the top of the plurality of probe rows.

[0014] In some embodiments of the present application, along the emission direction of the laser, the distance from the light outlet to each of the reflectors is equal.

[0015] In some embodiments of the present application, the solar cell laser sintering device further comprises:

[0016] A first moving mechanism is used to drive the laser source to move along the length direction of the reflector to perform laser scanning.

[0017] In some embodiments of the present application, the solar cell laser sintering device further comprises:

[0018] A second moving mechanism, wherein the second moving mechanism is used to drive the laser source to move along a preset trajectory to change the incident direction of the laser.

[0019] In some embodiments of the present application, the first moving mechanism includes:

[0020] A first slide rail, the first slide rail extending along the length direction of the reflector, the laser source being slidably disposed on the first slide rail;

[0021] A first driving member is connected to the laser source and is used to drive the laser source to slide along the first slide rail.

[0022] In some embodiments of the present application, the second moving mechanism includes:

[0023] a second slide rail, the second slide rail extending along the preset track, the second moving mechanism being slidably disposed on the second slide rail;

[0024] A second driving member is connected to the first moving mechanism and is used to drive the first moving mechanism to slide along the second slide rail.

[0025] In some embodiments of the present application, the solar cell laser sintering device further includes an angle adjuster, and the angle adjuster includes:

[0026] A fixed bracket, the fixed bracket is fixedly arranged on the top of the probe row;

[0027] A rotating bracket, wherein the rotating bracket is rotatably arranged on the fixed bracket, and the reflector is arranged on the rotating bracket so that the angle of the reflector is adjustable;

[0028] A locking member is configured to lock the rotating bracket at any rotation angle.

[0029] In some embodiments of the present application, the angle adjuster further comprises:

[0030] An adjusting rod, the adjusting rod is arranged through the fixed bracket and connected to the rotating bracket, the adjusting rod is provided with an external thread, the locking member is a nut, and the nut is matched with the adjusting rod thread;

[0031] An adjusting knob is arranged at one end of the adjusting rod.

[0032] In some embodiments of the present application, the angle adjuster further comprises:

[0033] A dial is fixed on the fixing bracket, and a pointer is arranged on the adjusting knob.

[0034] In some embodiments of the present application, the reflector is provided with a first heat dissipation unit.

[0035] In some embodiments of the present application, the first heat dissipation unit has a heat dissipation cavity, and a coolant is arranged in the heat dissipation cavity.

[0036] In some embodiments of the present application, the probe row includes a first bracket, the fixed bracket is fixedly disposed on the top of the first bracket, and the probe is fixedly disposed on the bottom of the first bracket.

[0037] In some embodiments of the present application, the solar cell laser sintering device further includes a second bracket and a third bracket arranged in parallel;

[0038] The second bracket is fixedly connected to the top of the first bracket of the first probe row, and the third bracket is connected to the top of the first bracket of the second probe row;

[0039] The first probe row is a probe row corresponding to the first electrode of the solar cell, the second probe row is a probe row corresponding to the second electrode of the solar cell, and the first electrode and the second electrode have opposite polarities.

[0040] In some embodiments of the present application, the solar cell laser sintering device further includes a second heat dissipation unit, and the second heat dissipation unit is used to dissipate heat from the solar cell laser sintering device.

[0041] In some embodiments of the present application, the second heat dissipation unit includes an air-cooling fan.

[0042] In some embodiments of the present application, the probe is an elastic probe, and the material of the elastic probe includes tungsten-rhenium alloy.

[0043] Compared with the prior art, this application has at least the following beneficial effects:

[0044] The solar cell laser sintering device provided in the embodiment of the present application can apply a reverse bias voltage to the electrode of the solar cell through the probes in the probe row, and can reflect the laser generated by the laser source to the surface of the solar cell through the optical path formed between two adjacent probe rows through the reflector. That is, the optical path of the laser is changed by utilizing the principle of light reflection so as to pass through the narrow gap between the probe rows, thereby increasing the working area of ​​the laser irradiating the solar cell surface, especially the laser irradiation area in the area near the solar cell electrode, which is more conducive to improving the metallization contact performance of the solar cell electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 This is a schematic structural diagram of a solar cell laser sintering device in one embodiment of the present application;

[0047] Figure 2 A schematic diagram of the structure of a probe row and a reflector in one embodiment of the present application;

[0048] Figure 3 A schematic diagram of a laser transmission path in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of the structure of a solar cell laser sintering device in another embodiment of the present application;

[0050] Figure 5 This is a schematic structural diagram of the top area of ​​the first bracket in one embodiment of the present application;

[0051] Figure 6 This is a structural schematic diagram of an angle adjuster in one embodiment of the present application;

[0052] Figure 7 This is a schematic diagram of the structure of a heat dissipation cavity in an embodiment of the present application;

[0053] Figure 8 A schematic diagram of the structure of a reflector in one embodiment of the present application;

[0054] Fig. 9 It is a schematic diagram of the structure of a reflector in another embodiment of the present application.

[0055] Description of reference numerals:

[0056] 1-laser source, 2-probe row, 3-reflector, 4-solar cell, 5-laser, 6-first slide rail, 7-air-cooling fan, 8-angle adjuster, 9-second slide rail, 11-laser, 12-optical path derivative tube, 13-light outlet, 20-probe, 21-first bracket, 22-fixed bracket, 23-second bracket, 24-third bracket, 31-heat dissipation cavity, 32-first groove, 51-optical pathway, 71-air-cooling bracket, 72-second groove, 81-adjusting rod, 82-dial, 83-nut, 84-adjusting knob, 121-laser beam splitter, 221-rotating bracket, 222-third groove, 841-pointer. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0059] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0060] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0062] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0063] Since the grid lines of back-contact solar cells are all arranged on the back side of the solar cells and are densely distributed, in the process of applying a reverse bias voltage to the grid lines on the back-contact solar cells, ordinary probe rows have the adverse effect of causing large-area shading of the irradiated laser. Especially when the laser needs to achieve localized irradiation of the sub-grid, the large-area shading caused by the ordinary probe row makes it impossible for the laser sintering equipment to perform laser sintering on the back-contact solar cells.

[0064] In view of this, the present application provides a solar cell laser sintering device. Figure 1 to Figure 3 As shown, the solar cell laser sintering device includes a laser source 1, which is used to generate laser light 5; a plurality of probe rows 2, which are arranged at intervals along a first direction, and an optical path 51 is formed between two adjacent probe rows 2; a reflector 3 is arranged on the top of each probe row 2, and a plurality of probes 20 are arranged on the bottom of each probe row 2; the reflector 3 is used to reflect the laser light 5 to the surface of the solar cell 4 through the optical path; and the probe 20 is used to apply a reverse bias voltage to the solar cell 4. The first direction is defined as the transmission direction of the solar cell 4 in this application.

[0065] The solar cell laser sintering device of the embodiment of the present application can apply a reverse bias voltage to the electrode of the solar cell through the probes in the probe row, and can reflect the laser generated by the laser source to the surface of the solar cell through the optical path formed between two adjacent probe rows through the reflector. That is, the optical path of the laser is changed by utilizing the principle of light reflection so as to pass through the narrow gap between the probe rows, thereby increasing the working area of ​​the laser irradiating the solar cell surface, and performing adjustable localized laser irradiation on the back-contact solar cell surface, especially the laser irradiation area in the area near the solar cell electrode, which is more conducive to improving the metallization contact performance of the solar cell electrode.

[0066] In an alternative embodiment, see Figure 1 and Figure 2 Along the first direction, the height of the reflector 3 corresponding to each probe row 2 is successively reduced, so that a height difference is formed between the reflectors 3 between adjacent probe rows 2 to avoid mutual blocking of the reflectors 3 between adjacent probe rows 2, so that the laser 5 can be incident on the reflector 3 corresponding to each probe row 2.

[0067] In an alternative embodiment, see Figure 3 The laser source 1 is used to generate multiple laser beams 5, and each laser beam 5 in the multiple laser beams 5 can be irradiated onto a corresponding reflector 3 of a probe row 2. For example, Figure 3 The first laser path 5 in the figure is one of the multiple laser paths, and the transmission direction of the laser path 5 is as follows: Figure 3 It is understood that the number of laser paths can be set according to the number of probe rows in the laser sintering device, and there is no particular limitation in the embodiment of the present application. For example, the number of laser paths is 2 to 100.

[0068] In an alternative embodiment, see Figure 3 , the laser source 1 includes an optical path derivative tube 12, the optical path derivative tube 12 has a light outlet 13; a laser 11, which is arranged in the optical path derivative tube 12; a laser beam splitter 121, which is arranged in the optical path derivative tube 12 and is located on the light outlet side of the laser 11, and the light outlet 13 of the optical path derivative tube 12 faces the reflector 3 at the top of multiple probe rows 2. Exemplarily, the number of lasers 11 is 3, and the number of laser beam splitters 121 is 3, forming a total of 9 lasers, which are respectively emitted from the light outlet 13 of the optical path derivative tube 12 and irradiated on different reflectors 3, and then reflected by the reflector 3, respectively emitted to the surface of the solar cell near the probe of the corresponding probe row. In this way, laser sintering can be performed on multiple places on the surface of the solar cell at the same time, thereby improving the efficiency of laser sintering. In addition, the optical path derivative tube 12 of the embodiment of the present application also has a light shielding effect, which reduces the influence of other light on the laser, that is, reduces light pollution. The laser beam splitter according to the embodiment of the present application may be an optical device that splits an incident laser beam into multiple laser beams.

[0069] The embodiments of the present application do not have any particular restrictions on the number of lasers and laser beam splitters, and the number of laser paths can be adjusted by adjusting the number of lasers and / or the number of laser beam splitters.

[0070] In an alternative embodiment, see Figure 1 , along the emission direction of the laser 5, the distances from the light outlet 13 to each reflector 3 are equal. In this way, the multiple lasers emitted from the light outlet can act on each reflector at the same time, reducing laser energy loss and improving laser sintering efficiency.

[0071] In an optional embodiment, the solar cell laser sintering device further comprises:

[0072] The first moving mechanism is used to drive the laser source to move along the length direction of the reflector to perform laser scanning. In this way, the laser can irradiate the strip reflector in a scanning manner along the length direction of the reflector, and then after being reflected by the reflector, it can also irradiate the surface of the solar cell in a scanning manner, thereby increasing the range of action of the laser on the solar cell electrode grid line, thereby improving the laser sintering efficiency. In addition, the laser scanning of the solar cell surface can also be achieved by other means, for example, making the laser emission angle adjustable in the horizontal direction, or controlling the solar cell to reciprocate in the horizontal direction.

[0073] In an optional embodiment, the solar cell laser sintering device further comprises:

[0074] The second moving mechanism is used to drive the laser source to move along a preset track to change the incident direction of the laser, so that the incident direction of the laser can be adjusted more flexibly so that the laser irradiates the reflector.

[0075] In an alternative embodiment, see Figure 1 The first moving mechanism includes: a first slide rail 6 and a first driving member (not shown), wherein the first slide rail 6 extends along the length direction of the reflector 3, and the laser source 1 is slidably disposed on the first slide rail 6; the first driving member is connected to the laser source 1, and is used to drive the laser source 1 to slide along the first slide rail. In one example, the first driving member may include a first motor and a first roller, wherein the first motor is connected to the laser source 1, the first roller is mounted on the first slide rail 6, and the first motor transmits power to the first roller, so that the laser source 1 slides on the first slide rail 6.

[0076] In an alternative embodiment, see Figure 4 The second moving mechanism includes: a second slide rail 9 and a second driving member (not shown), wherein the second slide rail 9 extends along a preset track, illustratively, can extend in an arc-shaped track. The first moving mechanism is slidably arranged on the second slide rail; the second driving member is connected to the first moving mechanism, and is used to drive the first moving mechanism to slide along the second slide rail 9. In one example, the second driving member may include a second motor and a second roller, wherein the second roller is mounted on the second slide rail 9, the second motor is connected to the first moving mechanism, and the second motor transmits power to the second roller, so that the first moving mechanism slides on the second slide rail 9.

[0077] In an alternative embodiment, see Figure 5 and Figure 6The solar cell laser sintering device further includes an angle adjuster 8, which includes: a fixed bracket 22, which is fixedly arranged on the top of the probe row 2; a rotating bracket 221, which is rotatably arranged on the fixed bracket 22, and a reflector 3 is arranged on the rotating bracket 221, so that the angle of the reflector is adjustable. For example, the reflector 3 can be rotated along its axial direction. For example, the reflector 3 can be embedded in the third groove 222 on the rotating bracket 221, which can not only rotate the reflector, but also facilitate the replacement of the reflector; a locking member, which is configured to lock the rotating bracket 221 at any rotation angle.

[0078] In an alternative embodiment, see Figure 5 and Figure 6 The angle adjuster 8 also includes: an adjusting rod 81, which is arranged through the fixed bracket 22 and connected to the rotating bracket 221, the adjusting rod 81 is provided with an external thread, the locking member is a nut 83, and the nut 83 is threadedly matched with the adjusting rod 81; an adjusting knob 84, and the adjusting knob 84 is arranged at one end of the adjusting rod 81.

[0079] In an alternative embodiment, see Figure 6 The angle adjuster 8 also includes: a dial 82 , which is fixed on the fixed bracket 22 , and a pointer 841 is provided on the adjustment knob 84 for indicating the rotation angle of the reflector through the dial 82 .

[0080] Exemplarily, the nut 83 is threadedly engaged with the adjusting rod 81. By screwing the nut 83, the nut 83 can be rotated along the surface of the adjusting rod 81 toward the inside or outside of the fixed bracket 22. When the nut 83 is rotated along the surface of the adjusting rod 81 toward the inside of the fixed bracket 22, the adjusting rod 81 is tightened; otherwise, the adjusting rod 81 is loosened.

[0081] In an optional embodiment, the reflector is provided with a first heat dissipation unit, which may include an active heat dissipation unit and a passive heat dissipation unit, so as to dissipate heat for the reflector and prevent the reflector from being damaged by the high energy of the laser. For example, the first heat dissipation unit may include but is not limited to a heat dissipation fan, a heat dissipation fin, a heat dissipation cavity, a heat dissipation film, etc.

[0082] In an alternative embodiment, see Figure 7The first heat dissipation unit has a heat dissipation cavity 31, and the heat dissipation cavity 31 can be a cavity with a semicircular cross section, and the cavity is filled with coolant. Optionally, the heat dissipation cavity 31 is connected to the rotating bracket 221. When the reflector is embedded in the third groove 222, the heat dissipation cavity 31 contacts the reflector to achieve the heat dissipation function. When the reflector contacts the heat dissipation cavity, the heat of the reflector is transferred to the coolant in the heat dissipation cavity and taken away, thereby achieving the cooling of the reflector. In addition, the bottom surface of the heat dissipation cavity 31 is also provided with a first groove 32 with a semicircular cross section. The extension direction of the first groove 32 is the same as the length direction of the reflector, and the first groove 32 can be used to pass the adjustment rod. The material of the heat dissipation cavity 31 includes a material with good thermal conductivity such as metal, which can be selected from aluminum alloy, stainless steel, brass and other materials. The coolant of the embodiment of the present application can use commercially available laser coolant. For example, the coolant includes components such as polyester-grade ethylene glycol, corrosion inhibitor and deionized water, and the freezing point range is -60°C to -20°C, wherein the corrosion inhibitor is an organic carboxylate composite corrosion inhibitor; the operating temperature range of the coolant is -55°C to 120°C; the coolant has excellent thermal conductivity, excellent metal corrosion resistance and non-metal compatibility, and excellent environmental protection performance.

[0083] In an alternative embodiment, see Figure 2 The probe row 2 includes a first bracket 21, a fixed bracket 22 fixedly arranged on the top of the first bracket 21, and a probe 20 fixedly arranged on the bottom of the first bracket 21. Specifically, the bottom of the first bracket 21 is fixedly connected to an end of the probe 20 away from the solar cell, which plays a role in fixing the probe 20. In addition, a wire (not shown) can be arranged inside the first bracket 21, and the wire is connected to the probes in the probe row in a circuit to power the probes.

[0084] In an alternative embodiment, see Figure 2 , the solar cell laser sintering device also includes a second bracket 23 and a third bracket 24 arranged in parallel. The second bracket 23 is fixedly connected to the top of the first bracket of the first probe row, and the third bracket 24 is connected to the top of the first bracket of the second probe row, so as to support the corresponding probe rows. The first probe row refers to the probe row corresponding to the first electrode of the solar cell, and the second probe row refers to the probe row corresponding to the second electrode of the solar cell, and the first electrode and the second electrode have opposite polarities. For example, see Figure 2The second bracket 23 is connected to the probe rows 2 of the 1st, 3rd, 5th, 7th and other odd numbers from left to right, and these probe rows are used as the first probe rows; the third bracket 24 is connected to the probe rows 2 of the 2nd, 4th, 6th, 8th and other even numbers from left to right, and these probe rows are used as the second probe rows. The above-mentioned odd-numbered probe rows correspond to the first electrodes of the solar cells, and the above-mentioned even-numbered probe rows correspond to the second electrodes of the solar cells. In addition, there is a gap between the second bracket 23 and the third bracket 24, which can prevent a short circuit between the two during laser sintering.

[0085] In an optional embodiment, when applying a reverse bias voltage, the present application can directly apply the positive and negative poles of the reverse bias voltage to the second bracket 23 and the third bracket 24 respectively. In this way, the positive and negative voltages can act on the corresponding probe rows uniformly, without the need to apply a reverse bias voltage to the probe rows separately, thereby further improving the laser sintering efficiency.

[0086] In an optional embodiment, the second bracket 23 and the third bracket 24 can also move in the vertical direction, thereby driving the probe to press on the electrode grid line or leave the surface of the solar cell. The up and down movement of the second bracket 23 and the third bracket 24 can be achieved by a cylinder, a motor or other mechanism, and there is no special limitation in the embodiment of the present application.

[0087] In an optional embodiment, the reflector is a strip reflector. In this way, it can better match the electrode grid lines of the solar cell. The reflector of the embodiment of the present application is more suitable for laser sintering of solar cells.

[0088] The reflector of the embodiment of the present application is in the shape of a strip. In one embodiment, see Figure 8 , the cross-section of the reflector is rectangular; in another embodiment, see Fig. 9 , the cross section of the reflector is a right triangle. The length of the reflector 3 can be adjusted according to the length of the electrode grid lines of the solar cell. For example, if the length of the electrode grid lines of the solar cell is longer, the length of the reflector 3 is increased accordingly; if the length of the electrode grid lines of the solar cell is shorter, the length of the reflector 3 is reduced accordingly. The embodiment of the present application has no special restrictions on the material of the reflector, such as but not limited to quartz, glass, etc. The embodiment of the present application has no special restrictions on the mirror shape of the reflector, which can be a plane, convex or concave, as long as it can achieve reflection of the laser.

[0089] In an optional embodiment, the sintering device further includes a second heat dissipation unit, which is used to dissipate heat from the solar cell laser sintering device to avoid damage to the laser sintering device due to heat accumulation.

[0090] In an alternative embodiment, see Figure 1The second heat dissipation unit includes an air-cooling fan 7, which is arranged on an air-cooling bracket 71, and the air-cooling bracket 71 can be fixed on the ground and perpendicular to the ground. Exemplarily, the air-cooling fan 7 can be fixed in the second groove 72 of the air-cooling bracket 71. The airflow direction of the air-cooling fan 7 is the same as the length direction of the strip reflector 3, which can further improve the heat dissipation effect on the reflector 3. The embodiment of the present application has no special restriction on the number of air-cooling fans 7, which can be set according to actual heat dissipation requirements.

[0091] In an optional embodiment, the probe is an elastic probe having a spring structure inside, which can firmly press the probe on the electrode grid line during the laser sintering process. The material of the elastic probe includes tungsten-rhenium alloy, and the surface of the elastic probe is gold-plated, which has excellent corrosion resistance, electrical performance, stability and durability.

[0092] The embodiment of the present application has no particular limitation on the distance between adjacent probe rows, as long as the purpose of the present application can be achieved, and the distance between adjacent probe rows can be adjusted according to the spacing between the electrode grid lines of the solar cell.

[0093] The embodiments of the present application have no particular restrictions on the parameters of the laser, as long as laser sintering can be achieved. For example, the laser power is 5W to 40W, the wavelength is 300nm to 2000nm, the pulse period is 1ms to 300ms, and the pulse irradiation time is 5ms to 20ms.

[0094] When a reverse bias voltage is applied to a solar cell in the embodiment of the present application, the voltage range of the reverse bias voltage is 2V to 40V. The reverse bias voltage in the embodiment of the present application means: a certain voltage is applied to a point in a circuit so that the potential of the point is shifted from a zero potential point to a predetermined positive potential or negative potential. The predetermined positive potential or negative potential can be pre-set by a technician according to actual needs.

[0095] The working process of the solar cell laser sintering device in the embodiment of the present application is as follows:

[0096] Step A, see Figure 1 to Figure 4 , a transmission mechanism (such as a conveyor belt) transmits the solar cell 4 to below the probe row 2 of the solar cell laser sintering device, wherein the solar cell 4 is a back-contact solar cell, and the side of the solar cell 4 having the electrode grid line faces the probe row 2; the laser source 1 can be driven to move along a preset track by the second slide rail 9 to adjust the incident direction of the laser 5;

[0097] Step B, the second bracket 23 and the third bracket 24 move downward, driving the corresponding probe row 2 to move downward, so that the probe 20 contacts the electrode grid line of the solar cell 4; at the same time, the laser 11 is turned on, and the generated laser 5 is transmitted through the optical path derivative tube 12 and branched by the laser beam splitter 121, and each path of laser 5 is irradiated on the surface of the corresponding reflector 3 respectively, and each reflector reflects the corresponding laser 5 to the surface of the solar cell 4 through the optical path 51; the positive and negative electrodes of the reverse bias voltage are applied to the second bracket 23 and the third bracket 24 respectively, so that the positive and negative voltages can act uniformly on the corresponding probe row; the reflection angle of the reflector 3 is adjusted by the adjustment rod 81, so as to control the laser 5 to irradiate the electrode grid line and / or the non-electrode grid line of the solar cell 4 to realize different processes; at the same time, the air-cooling fan 7 is turned on, and the heat of the reflector 3 absorbed by the coolant in the heat dissipation cavity 31 is blown away by the airflow, thereby dissipating the heat of the laser sintering device;

[0098] Step C: The laser source 1 moves horizontally through the first slide rail 6 to scan, and whether it is a single scan or a reciprocating scan is determined according to the debugging requirements;

[0099] Step D: After the laser source 1 completes scanning, the laser source 1 is reset, and the second bracket 23 and the third bracket 24 move upward, driving the corresponding probe row 2 to move upward, so that the probe 20 is separated from the electrode grid line of the solar cell 4, and the probe 20 rises to the original position;

[0100] Step E: After the laser sintering process is completed, the solar cell 4 is transferred to the next process step by the transfer mechanism.

[0101] The above is a detailed introduction to a solar cell laser sintering device disclosed in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core inventions of the embodiments of the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A solar cell laser sintering device, characterized in that: include: A laser source, the laser source is used to generate laser light; A plurality of probe rows, wherein the plurality of probe rows are arranged at intervals along a first direction, an optical path is formed between two adjacent probe rows, a reflector is disposed on the top of each probe row, and a plurality of probes are disposed on the bottom of each probe row; The reflector is used to reflect the laser to the surface of the solar cell through an optical path; The probe is used to apply a reverse bias voltage to the solar cell.

2. The solar cell laser sintering device according to claim 1, characterized in that: Along the first direction, the heights of the reflectors corresponding to the probe rows are sequentially reduced, so that the laser can be emitted onto the reflectors corresponding to the probe rows.

3. The solar cell laser sintering device according to claim 1, characterized in that: The laser source is used to generate multiple laser beams, and each of the multiple laser beams can be irradiated onto a corresponding reflector of the probe row.

4. The solar cell laser sintering device according to claim 3, characterized in that: The laser source comprises: The optical path derivative tube has a light outlet; A laser is arranged in the optical path derivative tube; A laser beam splitter is arranged in the optical path derivation tube and located at the light emitting side of the laser, and the light emitting port of the optical path derivation tube faces the reflector at the top of the plurality of probe rows.

5. The solar cell laser sintering device according to claim 4, characterized in that: Along the emitting direction of the laser, the distances from the light outlet to each of the reflectors are equal.

6. The solar cell laser sintering device according to any one of claims 1 to 5, characterized in that: The solar cell laser sintering device also includes: A first moving mechanism is used to drive the laser source to move along the length direction of the reflector to perform laser scanning.

7. The solar cell laser sintering device according to claim 6, characterized in that: The solar cell laser sintering device also includes: A second moving mechanism, wherein the second moving mechanism is used to drive the laser source to move along a preset trajectory to change the incident direction of the laser.

8. The solar cell laser sintering device according to claim 7, characterized in that: The first moving mechanism comprises: A first slide rail, the first slide rail extending along the length direction of the reflector, the laser source being slidably disposed on the first slide rail; A first driving member is connected to the laser source and is used to drive the laser source to slide along the first slide rail.

9. The solar cell laser sintering device according to claim 8, characterized in that: The second moving mechanism comprises: a second slide rail, the second slide rail extending along the preset track, the second moving mechanism being slidably disposed on the second slide rail; A second driving member is connected to the first moving mechanism and is used to drive the first moving mechanism to slide along the second slide rail.

10. The solar cell laser sintering device according to any one of claims 1 to 5, characterized in that: The solar cell laser sintering device also includes an angle adjuster, which includes: A fixed bracket, the fixed bracket is fixedly arranged on the top of the probe row; A rotating bracket, wherein the rotating bracket is rotatably arranged on the fixed bracket, and the reflector is arranged on the rotating bracket so that the angle of the reflector is adjustable; A locking member is configured to lock the rotating bracket at any rotation angle.

11. The solar cell laser sintering device according to claim 10, characterized in that: The angle adjuster also includes: An adjusting rod, the adjusting rod is arranged through the fixed bracket and connected to the rotating bracket, the adjusting rod is provided with an external thread, the locking member is a nut, and the nut is matched with the adjusting rod thread; An adjusting knob is arranged at one end of the adjusting rod.

12. The solar cell laser sintering device according to claim 11, characterized in that: The angle adjuster also includes: A dial is fixed on the fixing bracket, and a pointer is arranged on the adjusting knob.

13. The solar cell laser sintering device according to any one of claims 1 to 5, characterized in that: The reflector is provided with a first heat dissipation unit.

14. The solar cell laser sintering device according to claim 13, characterized in that: The first heat dissipation unit has a heat dissipation cavity, and a coolant is arranged in the heat dissipation cavity.

15. The solar cell laser sintering device according to claim 10, characterized in that: The probe row includes a first bracket, the fixed bracket is fixedly arranged on the top of the first bracket, and the probe is fixedly arranged on the bottom of the first bracket.

16. The solar cell laser sintering device according to claim 15, characterized in that: The solar cell laser sintering device also includes a second bracket and a third bracket arranged in parallel; The second bracket is fixedly connected to the top of the first bracket of the first probe row, and the third bracket is connected to the top of the first bracket of the second probe row; The first probe row is a probe row corresponding to the first electrode of the solar cell, the second probe row is a probe row corresponding to the second electrode of the solar cell, and the first electrode and the second electrode have opposite polarities.

17. The solar cell laser sintering device according to any one of claims 1 to 5, characterized in that: The solar cell laser sintering device further includes a second heat dissipation unit, which is used to dissipate heat from the solar cell laser sintering device.

18. The solar cell laser sintering device according to claim 17, characterized in that: The second heat dissipation unit includes an air-cooling fan.

19. The solar cell laser sintering device according to any one of claims 1 to 5, characterized in that: The probe is an elastic probe, and the material of the elastic probe includes tungsten-rhenium alloy.

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