Solar cell string processing system, solar cell string, processing method and photovoltaic module

Abstract

The invention relates to the technical field of solar cell string laser processing equipment, in particular to a solar cell string processing system, a solar cell string, a processing method and a photovoltaic module. The processing system comprises a bearing structure, an external voltage loading device, a laser and a compensation light source. The bearing structure is provided with a placing surface for placing a solar cell string. The external voltage loading device is configured to be electrically connected with the solar cell string so as to apply reverse bias voltage to the solar cell string. And the laser is configured to perform laser-induced sintering on the silver grid lines on the back surface of the solar cell string. The compensation light source is configured to irradiate the front face of the solar cell string so as to supplement carriers. According to the processing system, laser-induced sintering is carried out on the silver grid lines on the back face of the solar cell string through the laser device, meanwhile, the front face of the solar cell string is irradiated through the compensation light source, so that carriers are supplemented, the laser-induced sintering effect is improved, and the conversion efficiency of the solar cell string is improved through laser-induced sintering.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell string laser processing equipment, and in particular to a solar cell string processing system, a solar cell string and processing method, and a photovoltaic module. Background Art

[0002] A solar cell string refers to multiple solar cells connected in series to form a cell string. However, after the solar cells are welded in series by a welding machine, problems such as a decrease in fill factor and an increase in series resistance will occur, reducing the efficiency of the solar cell string. Summary of the invention

[0003] The embodiments of the present application disclose a solar cell string processing system, a solar cell string and processing method, and a photovoltaic module, which can perform laser-induced sintering on a solar cell string welded in series to improve the conversion efficiency of the solar cell string.

[0004] In order to achieve the above objectives, in a first aspect, an embodiment of the present application discloses a solar cell string processing system, the solar cell string processing system comprising:

[0005] A supporting structure having a placement surface for placing a solar cell string;

[0006] An external voltage loading device, the external voltage loading device is used to apply a reverse bias voltage to the solar cell string;

[0007] a laser configured to perform laser induced sintering of the silver grid lines on the back side of the solar cell string; and

[0008] The compensation light source is configured to illuminate the front side of the solar cell string.

[0009] As an optional implementation, the solar cell string processing system further includes:

[0010] A transport mechanism, the transport mechanism being configured to transport the solar cell string to the placement surface along a first direction and a second direction, and to transport the solar cell string away from the placement surface;

[0011] The first direction is the transmission direction of the solar cell string, and the second direction is a direction perpendicular to the placement surface.

[0012] As an optional implementation, the placement surface has a first side edge and a second side edge that are oppositely arranged in a direction perpendicular to the first direction;

[0013] The transport mechanism comprises:

[0014] a first displacement assembly and a first carrier platform located at the first side, wherein the first displacement assembly is connected to the first carrier platform to drive the first carrier platform to displace in the first direction and the second direction;

[0015] a second displacement assembly and a second carrier platform located at the second side, wherein the second displacement assembly is connected to the second carrier platform to drive the second carrier platform to displace in the first direction and the second direction;

[0016] The first carrier platform and the second carrier platform both have a first position. The first carrier platform located at the first position is butted against the first side edge, and the second carrier platform located at the first position is butted against the second side edge.

[0017] As an optional implementation, at the first side edge, the bearing structure has a first fitting inclined surface inclined toward the first carrier platform;

[0018] At the second side edge, the bearing structure has a second fitting inclined surface inclined toward the second carrier platform;

[0019] A third fitting slope is provided on a side of the first carrier platform close to the placement surface, and when the first carrier platform is located at the first position, the third fitting slope fits with the first fitting slope;

[0020] A fourth fitting slope is provided on a side of the second carrier platform close to the placement surface. When the second carrier platform is located at the first position, the fourth fitting slope fits with the second fitting slope.

[0021] As an optional implementation, the second direction is a vertical direction;

[0022] The first carrier platform has a first step surface formed by sinking, and the second carrier platform has a second step surface formed by sinking;

[0023] When the first carrier platform and the second carrier platform are located at the first position, the first step surface is connected to the first side edge, and the second step surface is connected to the second side edge. The first step surface is configured to place the first edge of the solar cell string, and the second step surface is configured to place the second edge of the solar cell string opposite to the first edge.

[0024] As an optional implementation, a first shaping slope is provided on the first carrier platform, the bottom end of the first shaping slope is connected to the first step surface, and the top end of the first shaping slope is inclined in a direction away from the first step surface;

[0025] And / or, a second shaping slope is provided on the second carrier platform, the bottom end of the second shaping slope is connected to the second step surface, and the top end of the second shaping slope is inclined in a direction away from the second step surface.

[0026] As an optional implementation, the first displacement assembly includes a first linear motor, a first slide and a first cylinder, the first slide is connected to the first linear motor, and the first linear motor is configured to drive the first slide to move along the first direction; the first cylinder is arranged on the first slide, and the first cylinder is configured to drive the first carrier to move along the second direction;

[0027] And / or, the second displacement assembly includes a second linear motor, a second slide and a second cylinder, the second slide is connected to the second linear motor, the second linear motor is configured to drive the second slide to move along the first direction; the second cylinder is arranged on the second slide, the second cylinder is configured to drive the second carrier to move along the second direction;

[0028] And / or, both the first carrier stage and the second carrier stage are light-transmitting carrier stages.

[0029] As an optional implementation, the solar cell string processing system further includes a loading conveyor belt and a unloading conveyor belt, and the loading conveyor belt and the unloading conveyor belt are both configured to convey the solar cell string along the first direction;

[0030] The first carrier platform and the second carrier platform that are displaced also have a second position and a third position, the first carrier platform and the second carrier platform located at the second position are respectively located at the outer sides of two opposite sides of the loading conveyor belt, and the first carrier platform and the second carrier platform located at the third position are respectively located at the outer sides of two opposite sides of the unloading conveyor belt;

[0031] And / or, the first direction is a horizontal direction.

[0032] As an optional implementation, the solar cell string processing system further includes:

[0033] A heat dissipation device is arranged corresponding to the placement surface to dissipate heat for the solar cell string on the placement surface.

[0034] As an optional implementation, the heat dissipation device includes a heat dissipation fan, and the heat dissipation fan is arranged opposite to the placement surface to perform air cooling and apply pressure to the solar cell string.

[0035] As an optional implementation, there are multiple cooling fans, and the multiple cooling fans are distributed above the placement surface.

[0036] As an optional implementation, the solar cell string processing system further includes a third displacement component and a fourth displacement component;

[0037] The third displacement component is connected to the laser to drive the laser to displace in a first direction and a second direction;

[0038] The fourth displacement component is connected to the external voltage loading device to drive the external voltage loading device to displace in a first direction and a second direction;

[0039] The third displacement assembly and / or the fourth displacement assembly is connected to the heat sink to drive the heat sink to displace in a vertical direction;

[0040] The first direction is the transmission direction of the solar cell string, and the second direction is a direction perpendicular to the placement surface.

[0041] As an optional implementation, the third displacement assembly includes a third linear motor, a first mounting seat, a fourth linear motor and a first bracket; the first mounting seat is connected to the third linear motor, and the third linear motor is configured to drive the first mounting seat to displace along the second direction; the fourth linear motor is arranged on the first mounting seat, the first bracket is connected to the fourth linear motor, and the fourth linear motor is configured to drive the first bracket to displace along the first direction, and the laser is arranged on the first bracket;

[0042] The fourth displacement assembly includes a fifth linear motor, a second mounting seat, a sixth linear motor and a second bracket; the second mounting seat is connected to the fifth linear motor, and the fifth linear motor is configured to drive the second mounting seat to displace along the second direction; the sixth linear motor is arranged on the second mounting seat, the second bracket is connected to the sixth linear motor, and the sixth linear motor is configured to drive the second bracket to displace along the first direction, and the external voltage loading device is arranged on the second bracket.

[0043] As an optional embodiment, the heat dissipation device also includes a frame, the heat dissipation fan is arranged on the frame, two opposite sides of the frame are respectively fixedly connected to the first mounting seat and the second mounting seat, and the first mounting seat and the second mounting seat are configured to rise and fall synchronously to drive the frame to rise and fall.

[0044] As an optional implementation, the bearing structure includes a box body, the box body defines a mounting cavity, the compensation light source is arranged in the mounting cavity, a light-transmitting cover is provided on the box body, and the placement surface is an outer surface of the light-transmitting cover;

[0045] The placement surface is configured to fit the front surface of the solar cell string so that the compensation light source illuminates the front surface of the solar cell string from below the placement surface;

[0046] The laser and the external voltage loading device are both located above the placement surface.

[0047] As an optional implementation, the external voltage loading device is an elastic probe row;

[0048] And / or, the compensation light source is a lamp tube;

[0049] And / or, the solar cell string processing system further comprises a working platform, and the bearing structure, the external voltage loading device, the laser and the compensation light source are all arranged on the working platform;

[0050] And / or, the external voltage loading device and the laser are respectively arranged on two opposite sides of the bearing structure.

[0051] In a second aspect, an embodiment of the present application discloses a method for processing a solar cell string, which uses the solar cell string processing system as described in the first aspect to process the solar cell string, and the processing method comprises the following steps:

[0052] Placing the solar cell string on the placement surface of the supporting structure;

[0053] Applying a reverse bias voltage to the solar cell string using the external voltage loading device;

[0054] The laser is used to perform laser-induced sintering on the silver grid lines on the back side of the solar cell string, and a compensation light source is used to irradiate the front side of the solar cell string to supplement carriers.

[0055] As an optional implementation, in the step of applying a reverse bias voltage to the solar cell string using the external voltage loading device, the voltage value of the reverse bias voltage applied is the product of the reverse bias voltage value required by a single solar cell in the solar cell string and the number of solar cells in series;

[0056] And / or, in the step of using the laser to perform laser induced sintering on the silver grid lines on the back side of the solar cell string, and simultaneously using a compensation light source to irradiate the front side of the solar cell string to supplement carriers, the laser wavelength emitted by the laser is 500nm to 1200nm, and the power density of the laser emitted by the laser is 10kW / m 2 ~10000kW / m 2The scanning rate of the laser emitted by the laser is 26m / s to 65m / s, and the power density of the light emitted by the compensation light source is 5kW / m 2 ~100kW / m 2 .

[0057] In a third aspect, an embodiment of the present application discloses a solar cell string, which is processed using the solar cell string processing system as described in the first aspect, or processed by the processing method as described in the second aspect.

[0058] As an optional implementation, the solar cell sheets in the solar cell string are back-contact solar cells, the back-contact solar cells include a silicon substrate, the silicon substrate has a front side and a back side, and the silver grid lines are arranged on the back side.

[0059] In a fourth aspect, an embodiment of the present application discloses a photovoltaic module, comprising a solar cell string as described in the third aspect.

[0060] Compared with the prior art, the beneficial effect of the present application is that when the solar cell string processing system performs laser-induced sintering on the silver grid lines on the back of the solar cell string through a laser, the front of the solar cell string is irradiated by a compensation light source at the same time to supplement carriers and improve the laser-induced sintering effect, so that the conversion efficiency of the solar cell strings welded in series can be improved through laser-induced sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] 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 paying creative work.

[0062] Figure 1 A three-dimensional diagram of a solar cell string processing system disclosed in an embodiment of the present application;

[0063] Figure 2 for Figure 1 A cross-sectional view of section AA shown in FIG.

[0064] Figure 3 yes Figure 2 A local enlarged view of the B area shown in FIG.

[0065] Figure 4 yes Figure 2 A local enlarged view of the C region shown in FIG.

[0066] Figure 5 yes Figure 2A schematic structural diagram of the laser, the external voltage loading device, the first carrier and the second carrier after displacement along the second direction;

[0067] Figure 6 yes Figure 5 A local enlarged view of the D region shown in FIG.

[0068] Figure 7 yes Figure 5 A local enlarged view of the E region shown in FIG.

[0069] Figure 8 It is an assembly diagram of the laser, the third displacement component, the external voltage loading device, the fourth displacement component and the heat dissipation device disclosed in the embodiment of the present application;

[0070] Fig. 9 yes Figure 8 A cross-sectional view of the FF section shown in ;

[0071] Fig.10 yes Figure 8 A cross-sectional view of section GG shown in ;

[0072] Fig.11 yes Figure 1 A top view of the first carrier and the second carrier after they are displaced to the second position;

[0073] Fig.12 yes Fig.11 A cross-sectional view of the HH section shown in ;

[0074] Fig.13 yes Figure 1 A top view of the first carrier and the second carrier after they are displaced to a third position;

[0075] Fig.14 yes Fig.13 A sectional view of section II is shown;

[0076] Fig.15 It is a schematic diagram of the structure of a solar cell string disclosed in an embodiment of the present application;

[0077] Fig.16 It is a cross-sectional view of a solar cell sheet in a solar cell string disclosed in an embodiment of the present application.

[0078] Description of reference numerals:

[0079] 100, bearing structure; 110, box body; 111, installation cavity; 120, light-transmitting cover; 121, placement surface; 122, first side edge; 123, second side edge; 124, first fitting slope; 125, second fitting slope; 200, external voltage loading device; 210, fourth displacement assembly; 211, fifth linear motor; 212, second mounting seat; 213, sixth linear motor; 214, second bracket; 300, laser; 310, third displacement assembly; 311, third linear motor; 312, first mounting seat; 313, fourth linear motor; 314, first bracket; 400, compensation light source; 500, solar cell string; 510, solar cell sheet; 511, front side; 512, back side; 513, silicon substrate ; 514, silver grid line; 530, first edge; 540, second edge; 600, working platform; 700, carrying mechanism; 710, first displacement assembly; 711, first linear motor; 712, first slide; 713, first cylinder; 720, first carrier; 721, third fitting slope; 722, first step surface; 723, first shaping slope; 730, second displacement assembly; 731, second linear motor; 732, second slide; 733, second cylinder; 740, second carrier; 741, fourth fitting slope; 742, second step surface; 743, second shaping slope; 800a, loading conveyor belt; 800b, unloading conveyor belt; 900, heat dissipation device; 910, cooling fan; 920, rack. DETAILED DESCRIPTION

[0080] 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.

[0081] In the present application, the terms "upper", "lower", "top", "bottom", "inner", "outer", "vertical", "horizontal", "horizontal direction", "vertical direction" 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.

[0082] 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.

[0083] In addition, the terms "disposed", "provided with", 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.

[0084] 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.

[0085] In the related art, after the solar cells are welded in series by a welding machine, problems such as a decrease in fill factor and an increase in series resistance will occur, thereby reducing the efficiency of the solar cell string. The inventors have found that some types of solar cell strings can effectively solve the above technical problems through laser induced sintering technology. However, for solar cell strings with silver grid lines mainly concentrated on the back, such as back-contact solar cell strings, when laser induced sintering is performed on the silver grid lines on the back of the solar cell string, due to the excessive density of the silver grid lines, only a small amount of laser light avoids the light-shielding silver grid lines and enters the silicon substrate, which results in a limited number of carriers that can be generated during the laser induced sintering process.

[0086] The principle of laser induced sintering technology is to stimulate a large number of carriers by laser scanning the solar cell sheet. Under the action of reverse bias voltage, a large number of carriers are accelerated along the path with the lowest resistivity in the solar cell sheet. These accelerated carriers will generate a lot of heat during the transportation process, and reduce the silver element in the silver paste to silver element, while forming electrical contact points with low ohmic contact between the silicon substrate and the silver grid line. When the number of carriers generated by the laser induced sintering process is insufficient, the solar cell string cannot effectively solve the problem of efficiency attenuation after welding through laser induced sintering.

[0087] Based on the above analysis, the present application provides a solar cell string processing system, which uses a laser to perform laser-induced sintering on the silver grid lines on the back of the solar cell string, and at the same time uses a compensation light source to irradiate the front of the solar cell string to supplement carriers and improve the laser-induced sintering effect, so that the conversion efficiency of the solar cell strings welded in series can be improved through laser-induced sintering.

[0088] The technical solution of the present invention will be described below in conjunction with embodiments and drawings.

[0089] First, see Figures 1 to 4 The embodiment of the present application discloses a solar cell string processing system. Exemplarily, the solar cell string processing system can be applied to a solar cell string 500 having back-contact solar cells, where only silver grid lines 514 are arranged on the back side 512 of the back-contact solar cells.

[0090] The solar cell string processing system includes a supporting structure 100 , an external voltage loading device 200 , a laser 300 and a compensation light source 400 .

[0091] The supporting structure 100 has a placement surface 121 for placing the solar cell string 500. Exemplarily, the supporting structure 100 may be a supporting workbench, a supporting seat, a supporting box or a supporting panel, but the present invention is not limited thereto.

[0092] The external voltage loading device 200 is used to apply a reverse bias voltage to the solar cell string 500. The term "reverse bias voltage" means that the P region of the solar cell string 500 is connected to the negative pole of the power supply, and the N region is connected to the positive pole of the power supply, which constitutes a reverse bias electric field of the PN junction. In one embodiment, the external voltage loading device 200 is electrically connected to the solar cell string 500 by docking with the bus bar on the solar cell string 500. Exemplarily, the external voltage loading device 200 can be an electrical connection probe, an electrical connection column, an electrical connection sheet or an electrical connection terminal, but the present invention is not limited thereto.

[0093] The laser 300 is configured to perform laser induced sintering on the silver grid lines 514 on the back side 512 of the solar cell string 500. The silver grid lines are grid lines containing metallic silver. Laser induced sintering (LIF) refers to exciting charge carriers by laser scanning the solar cell string 500, and the free carriers are forced to pass through the electrical contact points formed by the silver grid lines 514 and the silicon substrate, so that the contact resistance between the silver grid lines 514 and the silicon substrate is reduced, thereby improving the efficiency of the solar cell string 500.

[0094] The compensation light source 400 is configured to irradiate the front side 511 of the solar cell string 500 to supplement the carriers, thereby solving the problem of insufficient carriers excited by the laser induced sintering process due to the over-dense silver grid lines 514 on the back side 512. It can be understood that in order to enable the solar cell string 500 to generate carriers, the spectrum generated by the compensation light source 400 is within the spectral response range of the silicon material.

[0095] When the solar cell string processing system performs laser-induced sintering on the silver grid lines 514 on the back side 512 of the solar cell string 500 through the laser 300, the front side 511 of the solar cell string 500 is irradiated by the compensation light source 400 at the same time to supplement the carriers and improve the laser-induced sintering effect, so that the conversion efficiency of the solar cell string 500 welded in series can be improved through laser-induced sintering.

[0096] Preferably, the light source 400 is a lamp tube, because the light emitted by the lamp tube can easily cover the front surface 511 of the solar cell string 500 to generate enough carriers.

[0097] Preferably, the external voltage loading device 200 is an elastic probe row, which includes a plurality of elastic probes arranged in sequence. Since the elastic probe row presses on the solar cell string 500 when electrically connected to the solar cell string 500, the elastic probe row can reduce rigid contact and ensure the structural integrity of the solar cell string 500.

[0098] Further, see Figure 1 The solar cell string processing system also includes a working platform 600 , on which the supporting structure 100 , the external voltage loading device 200 , the laser 300 and the compensation light source 400 are all arranged.

[0099] As an optional implementation, Figure 1 and Figure 2 As shown, the bearing structure 100 includes a box body 110, and a mounting cavity 111 is defined in the box body 110. The compensation light source 400 is arranged in the mounting cavity 111. The box body 110 protects the compensation light source 400 and prevents the compensation light source 400 from being hit. A light-transmitting cover 120 is provided on the box body 110, and a placement surface 121 is the outer surface of the light-transmitting cover 120. The placement surface 121 is configured to fit with the front surface 511 of the solar cell string 500, so that the compensation light source 400 illuminates the front surface 511 of the solar cell string 500 from below the placement surface 121. The second direction is as shown in FIG. Figure 2 In the Z0-Z1 direction shown in the figure, when the second direction is the vertical direction, the front side 511 of the solar cell string 500 is downward, and the back side 512 of the solar cell string 500 is upward. Since the silver grid line 514 on the back side 512 is subjected to laser induced sintering, the laser 300 and the external voltage loading device 200 are both located above the placement surface 121, so that the external voltage loading device 200 is electrically connected to the solar cell string 500, and the laser 300 laser scans the solar cell string 500.

[0100] As an optional implementation, see Figure 1 and Figure 2 The solar cell string processing system further includes a transport mechanism 700 , which is configured to transport the solar cell string 500 to the placement surface 121 along the first direction and the second direction, and to transport the solar cell string 500 away from the placement surface 121 .

[0101] The first direction is the transmission direction of the solar cell string 500, and the second direction is the direction perpendicular to the placement surface 121. Figure 1The second direction is as follows Figure 2 The Z0-Z1 direction in the diagram.

[0102] The transport mechanism 700 transports the welded solar cell string 500 to a position corresponding to the placement surface 121, and then displaces the solar cell string 500 along the second direction to place the solar cell string 500 on the placement surface 121. The laser 300 performs laser-induced sintering on the back surface 512 of the solar cell string 500 on the placement surface 121, and the compensation light source 400 irradiates the front surface 511 of the solar cell string 500 to supplement carriers. After laser-induced sintering, the transport mechanism 700 takes the solar cell string 500 away from the placement surface 121 along the second direction, and then moves the solar cell string 500 away along the first direction to complete the processing.

[0103] Exemplarily, the transport mechanism 700 may be a two-axis manipulator or a two-axis linear displacement mechanism. Preferably, the transport mechanism 700 is also disposed on the working platform 600 .

[0104] As an optional implementation, refer to Figure 1 and Figure 2 The placement surface 121 has a first side edge 122 and a second side edge 123 arranged opposite to each other in a direction perpendicular to the first direction. The direction perpendicular to the first direction refers to Figure 1 The X0-X1 direction in .

[0105] The transport mechanism 700 includes a first displacement assembly 710 and a first transport platform 720 located on the first side 122 , and a second displacement assembly 730 and a second transport platform 740 located on the second side 123 .

[0106] The first displacement assembly 710 is connected to the first carrier 720 to drive the first carrier 720 to move in the first direction and the second direction.

[0107] The second displacement assembly 730 is connected to the second carrier 740 to drive the second carrier 740 to move in the first direction and the second direction.

[0108] The first carrier 720 and the second carrier 740 both have a first position. The first carrier 720 at the first position is docked with the first side 122 , and the second carrier 740 at the first position is docked with the second side 123 .

[0109] It can be understood that the size of the placement surface 121 in the direction perpendicular to the first direction is less than the size of the solar cell in the direction, so that after the solar cell string 500 is placed on the placement surface 121, the two edges of the solar cell string 500 in the direction protrude from the first side 122 and the second side 123 respectively. In other words, the transport mechanism 700 supports both sides of the solar cell string 500 through the first transport platform 720 and the second transport platform 740 to realize the transport of the solar cell string 500. Compared with other transport methods, such as carrying the solar cell string 500 by clamping, there are forces on both sides of the solar cell string 500 when clamping the solar cell string 500, and a large force is required to ensure the clamping effect, which easily causes the solar cell string 500 to be clamped and damaged. However, the transport method of the present application only has a force on one side of the solar cell string 500, and the force is small, which is more conducive to avoiding damage to the solar cell string 500, and it is easy to directly cooperate with conveying machinery such as conveyor belts.

[0110] As an optional implementation, Figure 3 and Figure 4 As shown, at the first side edge 122 , the supporting structure 100 has a first fitting inclined surface 124 inclined toward the first carrier 720 . At the second side edge 123 , the supporting structure 100 has a second fitting inclined surface 125 inclined toward the second carrier 740 .

[0111] A third laminating inclined surface 721 is disposed on one side of the first carrier 720 close to the placement surface 121 . When the first carrier 720 is located at the first position, the third laminating inclined surface 721 is in contact with the first laminating inclined surface 124 .

[0112] A fourth laminating inclined surface 741 is disposed on one side of the second carrier 740 close to the placement surface 121 . When the second carrier 740 is located at the first position, the fourth laminating inclined surface 741 is in contact with the second laminating inclined surface 125 .

[0113] like Figures 5 to 7As shown, after the solar cell string 500 is loaded onto the first carrier 720 and the second carrier 740, the first carrier 720 and the second carrier 740 respectively transport the solar cell string 500 along the first direction to a position opposite to the placement surface 121 through the first displacement assembly 710 and the second displacement assembly 730. Then the first carrier 720 and the second carrier 740 continue to approach the placement surface 121 along the second direction, and during this process, the third bonding slope 721 gradually bonds with the first bonding slope 124, and the fourth bonding slope 741 gradually bonds with the second bonding slope 125. When the third fitting slope 721 and the first fitting slope 124 are fitted into place, and the fourth fitting slope 741 and the second fitting slope 125 are fitted into place, the first carrier 720 and the second carrier 740 are fixed in position in the second direction and will not be easily displaced even if subjected to force, which is conducive to positioning the first carrier 720 at the first side edge 122 and the second carrier 740 at the second side edge 123, so that the solar cell string 500 is fixed flatly on the placement surface 121.

[0114] Furthermore, because the external voltage loading device 200 is in physical contact with multiple positions on the back side 512 of the solar cell string 500 on a reference plane, the reference plane is parallel to the placement surface 121. If the solar cell string 500 cannot be placed flatly on the placement surface 121, when the external voltage loading device 200 contacts the solar cell string 500, the local force of the external voltage loading device 200 on the solar cell string 500 is relatively large, causing the solar cell string 500 to have hidden cracks, etc. The present application is to place the solar cell string 500 flatly and in a fixed position on the placement surface 121, so that the solar cell string 500 can avoid the situation of large force when it contacts the external voltage loading device 200, prevent the solar cell string 500 from having hidden cracks, and improve the processing quality of the solar cell string 500.

[0115] As an optional implementation, the second direction is a vertical direction;

[0116] like Figure 3 and Figure 4 As shown, the first carrier 720 has a first step surface 722 formed by sinking, and the second carrier 740 has a second step surface 742 formed by sinking.

[0117] When the first carrier platform 720 and the second carrier platform 740 are in the first position, the first step surface 722 is connected to the first side 122, and the second step surface 742 is connected to the second side 123. The first step surface 722 is configured to place the first edge 530 of the solar cell string 500, and the second step surface 742 is configured to place the second edge 540 of the solar cell string 500 opposite to the first edge 530.

[0118] It can be understood that the first carrier platform 720 and the second carrier platform 740 hold up the first edge 530 and the second edge 540 of the solar cell string 500 in a supporting manner, thereby carrying the solar cell string 500. And by setting the first step surface 722 and the second step surface 742, when the solar cell string 500 needs to be transferred to the first carrier platform 720 and the second carrier platform 740, the first carrier platform 720 and the second carrier platform 740 are located below the solar cell string 500, and then rise in the vertical direction, the first edge 530 of the solar cell string 500 slides onto the first step surface 722 for placement, and the second edge 540 of the solar cell string 500 slides onto the second step surface 742 for placement, and the solar cell string 500 is transferred to the first carrier platform 720 and the second carrier platform 740 by gravity, and the first carrier platform 720 and the second carrier platform 740 continue to rise and then carry the solar cell string 500 to continue to be transported along the first direction.

[0119] As an optional implementation, Figure 3 and Figure 4 As shown, a first shaping slope 723 is provided on the first carrier 720, the bottom end of the first shaping slope 723 is connected to the first step surface 722, and the top end of the first shaping slope 723 is inclined in a direction away from the first step surface 722. When the first edge 530 of the solar cell string 500 needs to be transferred to the first step surface 722, the first carrier 720 rises, and the first edge 530 of the solar cell string 500 gradually approaches the first step surface 722 from the top end of the first shaping slope 723 under the guidance of the first shaping slope 723, and finally the first edge 530 of the solar cell string 500 slides down to a preset position of the first step surface 722 in a controlled manner.

[0120] And / or, a second shaping slope 743 is provided on the second carrier 740, the bottom end of the second shaping slope 743 is connected to the second step surface 742, and the top end of the second shaping slope 743 is inclined in a direction away from the second step surface 742. When the second edge 540 of the solar cell string 500 needs to be transferred to the second step surface 742, the second carrier 740 rises, and the second edge 540 of the solar cell string 500 gradually approaches the second step surface 742 from the top end of the second shaping slope 743 under the guidance of the second shaping slope 743, and finally the second edge 540 of the solar cell string 500 slides down to the preset position of the second step surface 742 in a controlled manner.

[0121] The term "shaping" refers to adjusting the placement form, posture, and position of the solar cell string 500. For example, after the shaping, the plane where the solar cell string 500 is located is parallel to the horizontal plane, and one of the midlines of the solar cell string 500 is parallel to the first direction. By setting the first shaping slope 723 and / or the second shaping slope 743, the solar cell string 500 is shaped to ensure that the solar cell string 500 is accurately placed. The accurately placed solar cell string 500 is conducive to the accuracy of the laser scanning of the laser 300 and the position accuracy of the external voltage loading device 200 when making electrical connections.

[0122] As an optional implementation, Figure 5 As shown, the first displacement assembly 710 includes a first linear motor 711, a first slide 712 and a first cylinder 713. The first slide 712 is connected to the first linear motor 711, and the first linear motor 711 is configured to drive the first slide 712 to displace in the first direction. The first cylinder 713 is disposed on the first slide 712, and the first cylinder 713 is configured to drive the first carrier 720 to displace in the second direction, thereby causing the first carrier 720 to displace in the first direction and the second direction. Exemplarily, the guide rail of the first linear motor 711 extends in the first direction, the first slide 712 is connected to the mover of the first linear motor 711, and the first carrier 720 is connected to the piston rod of the first cylinder 713. The number of the first cylinder 713 can be one or more.

[0123] The second displacement assembly 730 includes a second linear motor 731, a second slide 732, and a second cylinder 733. The second slide 732 is connected to the second linear motor 731, and the second linear motor 731 is configured to drive the second slide 732 to move in the first direction; the second cylinder 733 is disposed on the second slide 732, and the second cylinder 733 is configured to drive the second carrier 740 to move in the second direction, thereby causing the second carrier 740 to move in the first direction and the second direction. Exemplarily, the guide rail of the second linear motor 731 extends in the first direction, the second slide 732 is connected to the mover of the second linear motor 731, and the second carrier 740 is connected to the piston rod of the second cylinder 733. The number of the second cylinder 733 can be one or more.

[0124] The first linear motor 711 and the second linear motor 731 have the advantages of high displacement accuracy, fast displacement speed and low working noise, and are conducive to accurately and quickly carrying the solar cell string 500.

[0125] Further, the first carrier 720 and the second carrier 740 are both light-transmitting carriers. The light-transmitting carriers allow light to pass through the light-transmitting carriers and illuminate the partial front surface 511 of the solar cell string 500 placed on the two light-transmitting carriers to better replenish carriers. Exemplarily, the material of the light-transmitting carrier can be glass and transparent plastic, preferably high-temperature glass.

[0126] As an optional implementation, refer to Figure 2 The solar cell string 500 processing system further includes a heat sink 900, which is arranged corresponding to the placement surface 121 to dissipate heat from the solar cell string 500 on the placement surface 121. Optionally, the heat sink 900 may be an air-cooled heat sink, a liquid-cooled heat sink, or an electronic refrigeration device, and the liquid-cooled heat sink may be in contact with the placement surface 121 to remove heat from the solar cell string 500 on the placement surface 121. The electronic refrigeration device is, for example, a semiconductor refrigeration sheet, and similarly, the electronic refrigeration device is in contact with the placement surface 121 to dissipate heat.

[0127] Preferably, refer to Figure 2 The heat dissipation device 900 includes a heat dissipation fan 910, which is arranged opposite to the placement surface 121 to cool and apply pressure to the solar cell string 500. When the heat dissipation fan 910 is working, it generates a heat dissipation airflow, which can take away the heat on the solar cell string 500 and apply pressure on the surface of the solar cell string 500 when facing the solar cell string 500 on the placement surface 121, so that the solar cell string 500 is firmly placed on the placement surface 121 to prevent the solar cell string 500 from shifting.

[0128] Since the solar cell string 500 is in sheet form, it is difficult for a single cooling fan 910 to evenly dissipate heat and apply pressure to multiple locations of the solar cell string 500. Figure 2 In order to evenly dissipate heat and apply pressure to more than 500 positions of the solar cell string, there are multiple cooling fans 910, and the multiple cooling fans 910 are distributed above the placement surface 121.

[0129] As an optional implementation, refer to Figure 2 , Figures 8 to 10 The solar cell string 500 processing system further includes a third displacement component 310 and a fourth displacement component 210 .

[0130] The third displacement component 310 is connected to the laser 300 to drive the laser 300 to displace in the first direction and the second direction. Figure 8 The Z0-Z1 direction in the first direction is Fig. 9 The Y0-Y1 direction in .

[0131] When the laser 300 performs laser induced sintering on the back side 512 of the solar cell string 500, the third displacement assembly 310 drives the laser 300 to displace in the second direction so as to approach the solar cell string 500 for laser induced sintering. After completing the laser induced sintering on a part of the back side 512, the third displacement assembly 310 drives the laser 300 to displace in the first direction so as to allow the laser 300 to perform laser induced sintering on other areas of the back side 512. After completing the laser induced sintering, the third displacement assembly 310 drives the laser 300 to displace in the second direction so as to be away from the solar cell string 500.

[0132] The fourth displacement component 210 is connected to the external voltage loading device 200 to drive the external voltage loading device 200 to shift in the first direction and the second direction. Figure 8 The Z0-Z1 direction in the first direction is Fig.10 The Y0-Y1 direction in .

[0133] When the solar cell string 500 is placed on the placement surface 121 for laser induced sintering, if the external voltage loading device 200 does not correspond to the electrical connection area of ​​the solar cell string 500, the fourth displacement assembly 210 drives the external voltage loading device 200 to displace in the first direction so that the external voltage loading device 200 corresponds to the electrical connection area of ​​the solar cell string 500, and then the fourth displacement assembly 210 drives the external voltage loading device 200 to displace in the second direction to approach the solar cell string 500 until the external voltage loading device 200 is electrically connected to the solar cell string 500. After the solar cell string 500 completes laser induced sintering, the fourth displacement assembly 210 drives the external voltage loading device 200 to displace in the second direction, and the external voltage loading device 200 is separated from the solar cell string 500.

[0134] The third displacement assembly 310 and / or the fourth displacement assembly 210 are connected to the heat sink 900 to drive the heat sink 900 to move in the second direction. It can be understood that the laser induced sintering process will cause the solar cell string 500 to heat up, and the present application is to make the heat sink 900 and the laser 300 and / or the external voltage loading device 200 work together, so that when the laser 300 and the external voltage loading device 200 are displaced along the second direction and approach the solar cell string 500 for laser induced sintering, the heat sink 900 and the laser 300 and / or the external voltage loading device 200 are close to the solar cell string 500 together, so as to better dissipate heat for the solar cell string 500 during the laser induced sintering process. After the laser induced sintering is completed, the heat sink 900 and the laser 300 and / or the external voltage loading device 200 are moved away from the solar cell string 500 together, so as to remove the solar cell string 500 from the placement surface 121.

[0135] The external voltage loading device 200 and the laser 300 are respectively arranged on opposite sides of the bearing structure 100 to avoid mutual interference between the external voltage loading device 200 and the laser 300 during displacement. Furthermore, the third displacement component 310 and the fourth displacement component 210 are also arranged relatively to each other, which is beneficial to the rationality of the structural layout.

[0136] like Figures 8 to 10 As shown, the third displacement assembly 310 includes a third linear motor 311, a first mounting seat 312, a fourth linear motor 313 and a first bracket 314. The first mounting seat 312 is connected to the third linear motor 311, and the third linear motor 311 is configured to drive the first mounting seat 312 to displace along the second direction. The fourth linear motor 313 is arranged on the first mounting seat 312, the first bracket 314 is connected to the fourth linear motor 313, and the fourth linear motor 313 is configured to drive the first bracket 314 to displace along the first direction, and the laser 300 is arranged on the first bracket 314. The third linear motor 311 and the fourth linear motor 313 have the characteristics of high displacement accuracy and fast displacement speed, which is conducive to improving the scanning stability of the laser 300.

[0137] The fourth displacement assembly 210 includes a fifth linear motor 211, a second mounting seat 212, a sixth linear motor 213 and a second bracket 214. The second mounting seat 212 is connected to the fifth linear motor 211, and the fifth linear motor 211 is configured to drive the second mounting seat 212 to displace along the second direction. The sixth linear motor 213 is arranged on the second mounting seat 212, the second bracket 214 is connected to the sixth linear motor 213, and the sixth linear motor 213 is configured to drive the second bracket 214 to displace along the first direction, and the external voltage loading device 200 is arranged on the second bracket 214. The fifth linear motor 211 and the sixth linear motor 213 have the characteristics of high displacement accuracy and fast displacement speed, which is conducive to reducing the probability of docking deviation of the external voltage loading device 200.

[0138] Furthermore, if Fig. 9 and Fig.10 As shown, the heat dissipation device 900 also includes a frame 920, and the heat dissipation fan 910 is arranged on the frame 920. The two opposite sides of the frame 920 are respectively fixedly connected to the first mounting seat 312 and the second mounting seat 212. The first mounting seat 312 and the second mounting seat 212 are configured to be raised and lowered synchronously to drive the frame 920 to rise and fall, which is conducive to the smooth lifting and lowering of the frame 920.

[0139] As an optional implementation, Figures 11 to 14As shown, the solar cell string 500 processing system further includes a loading conveyor belt 800a and a unloading conveyor belt 800b. The loading conveyor belt 800a and the unloading conveyor belt 800b are both configured to convey the solar cell string 500 along a first direction. The loading conveyor belt 800a is used to convey the solar cell string 500 after welding, and the unloading conveyor belt 800b is used to convey the solar cell string 500 after laser induced sintering. The first direction is as shown in FIG. Fig.11 and Fig.13 Preferably, the first direction is a horizontal direction.

[0140] The displaced first carrier 720 and the second carrier 740 also each have a second position and a third position.

[0141] The first carrier platform 720 and the second carrier platform 740 located at the second position are respectively located on the outer sides of two opposite sides of the loading conveyor belt 800a. The first carrier platform 720 and the second carrier platform 740 located at the second position respectively support the first edge 530 and the second edge 540 of the solar cell string 500. The first carrier platform 720 and the second carrier platform 740 continue to rise to take the solar cell string 500 away from the loading conveyor belt 800a.

[0142] The first carrier 720 and the second carrier 740 located at the third position are located outside two opposite sides of the unloading conveyor belt 800b. The first carrier 720 and the second carrier 740 continue to descend, and the solar cell string 500 is transferred from the first carrier 720 and the second carrier 740 to the unloading conveyor belt 800b, and the unloading conveyor belt 800b transports the solar cell string 500 away.

[0143] The following describes in detail the conveying process of the solar cell string 500 of the solar cell string processing system with the first direction being the horizontal direction and the second direction being the vertical direction, as follows:

[0144] Loading process: Fig.11 and Fig.12As shown, when the welded solar cell string 500 is conveyed horizontally on the loading conveyor belt 800a, the first edge 530 and the second edge 540 of the solar cell string 500 protrude from both sides of the loading conveyor belt 800a respectively, the first carrier 720 and the second carrier 740 are pre-displaced to both sides of the loading conveyor belt 800a but are located below the solar cell string 500, the first carrier 720 and the second carrier 740 rise to the second position in the vertical direction, the first edge 530 and the second edge 540 are supported on the first carrier 720 and the second carrier 740 respectively, the first carrier 720 and the second carrier 740 continue to rise to take the solar cell string 500 away from the loading conveyor belt 800a, and then the first carrier 720 and the second carrier 740 carry the solar cell string in the horizontal direction to the top of the placement surface, and finally the first carrier 720 and the second carrier 740 are displaced to the first position to complete the loading.

[0145] Unloading process: The first carrier 720 and the second carrier 740 located at the first position rise to lift the solar cell string 500. The first carrier 720 and the second carrier 740 carry the solar cell string 500 horizontally to the top of the unloading conveyor belt 800b. Fig.13 and Fig.14 As shown, the first carrier 720 and the second carrier 740 descend to the third position, the solar cell string 500 is attached to the unloading conveyor belt 800b, the first carrier 720 and the second carrier 740 continue to descend and separate from the solar cell string 500, and the unloading conveyor belt 800b transports the solar cell string 500 away.

[0146] In a second aspect, an embodiment of the present application discloses a method for processing a solar cell string, which uses the solar cell string processing system of the first aspect to process the solar cell string, and the processing method comprises the following steps:

[0147] Placing the solar cell string on the placement surface of the bearing structure;

[0148] Applying a reverse bias voltage to the solar cell string using an external voltage loading device;

[0149] The laser is used to perform laser-induced sintering on the silver grid lines on the back side of the solar cell string, and at the same time, a compensation light source is used to irradiate the front side of the solar cell string to supplement carriers.

[0150] The processing method of the solar cell string uses a laser to perform laser-induced sintering on the silver grid lines on the back side of the solar cell string, and simultaneously irradiates the front side of the solar cell string with a compensation light source to generate supplementary carriers in the silicon substrate of the solar cell, thereby improving the laser-induced sintering effect, so that the conversion efficiency of the solar cell string welded in series can be improved through laser-induced sintering.

[0151] Before the step of placing the solar cell string on the placement surface of the supporting structure, the processing method further includes the following steps:

[0152] Loading of solar cell strings: The welded solar cell strings are transported horizontally on the loading conveyor belt, and the first edge and the second edge of the solar cell string protrude from both sides of the loading conveyor belt respectively. The first carrier and the second carrier are pre-displaced to both sides of the loading conveyor belt but are located below the solar cell string. The first carrier and the second carrier rise in the vertical direction, and the first edge of the solar cell string slides to the first step surface under the shaping effect of the first shaping slope, and the second edge of the solar cell string slides to the second step surface under the shaping effect of the second shaping slope. When the first carrier and the second carrier rise to the second position, the first edge and the second edge are supported on the first step surface and the second step surface respectively. The first carrier and the second carrier continue to rise to take the solar cell string away from the loading conveyor belt, and then the first carrier and the second carrier carry the solar cell string in the horizontal direction to the top of the placement surface.

[0153] The steps of placing the solar cell string on the placement surface of the supporting structure include:

[0154] The first carrier and the second carrier located directly above the placement surface descend in the vertical direction, and the third bonding slope gradually bonds with the first bonding slope, and the fourth bonding slope gradually bonds with the second bonding slope. When the third bonding slope and the first bonding slope are bonded in place, and the fourth bonding slope and the second bonding slope are bonded in place, the first carrier and the second carrier reach the first position. The solar cell string is placed on the placement surface.

[0155] The steps of applying a reverse bias voltage to a solar cell string by using an external voltage loading device include:

[0156] The sixth linear motor drives the second bracket to move horizontally so that the external voltage loading device on the second bracket corresponds to the bus bar on the solar cell string. Then the fifth linear motor drives the second mounting seat to descend vertically, and the external voltage loading device is electrically connected to the bus bar on the solar cell string.

[0157] The third linear motor also synchronously drives the first mounting seat to descend in the vertical direction, and the laser descends to a working position for laser induced sintering, and at the same time, the heat dissipation device also descends to a working position for heat dissipation.

[0158] The steps of using a laser to perform laser induced sintering on the silver grid lines on the back side of the solar cell string and using a compensation light source to irradiate the front side of the solar cell string to supplement carriers include:

[0159] Turn on the laser, compensation light source and cooling fan. The laser performs laser-induced sintering on the silver grid lines on the back of the solar cell string. At the same time, the compensation light source irradiates the front of the solar cell string to supplement carriers. The cooling fan dissipates heat from the solar cell string.

[0160] When the laser completes laser induced sintering of one area on the solar cell string, the fourth linear motor drives the laser on the first bracket to move horizontally to perform laser induced sintering on the next area on the solar cell string until laser induced sintering is completed on all areas on the solar cell string.

[0161] After the steps of using a laser to perform laser-induced sintering on the silver grid lines on the back side of the solar cell string and using a compensation light source to irradiate the front side of the solar cell string to supplement carriers, the processing method further comprises the following steps:

[0162] The laser, compensation light source and cooling fan rise: turn off the laser, compensation light source and cooling fan, the third linear motor also synchronously drives the first mounting seat to rise in the vertical direction, the fifth linear motor drives the second mounting seat to rise in the vertical direction, and the laser, external voltage loading device and cooling fan are away from the solar cell string.

[0163] Unloading of solar cell string: The first carrier and the second carrier rise in the vertical direction, lift the solar cell string and remove it from the placement surface. The first carrier and the second carrier carry the solar cell string in the horizontal direction to the top of the unloading conveyor belt. The first carrier and the second carrier descend, and when the first carrier and the second carrier reach the third position, the solar cell string fits the unloading conveyor belt, and the first carrier and the second carrier continue to descend and separate from the solar cell string, and the unloading conveyor belt transports the solar cell string away.

[0164] As an optional implementation, in the step of applying a reverse bias voltage to the solar cell string using an external voltage loading device, the voltage value of the reverse bias voltage applied is the product of the reverse bias voltage value required by a single solar cell 510 in the solar cell string and the number of solar cells in series in the solar cell string, so that each solar cell 510 is applied with sufficient reverse bias voltage to ensure the effect of laser induced sintering. Exemplarily, the reverse bias voltage value required by a single solar cell 510 is V, and the number of solar cells in series in the solar cell string, i.e., the number of solar cells 510 in the solar cell string, is n, then the voltage value of the reverse bias voltage applied is nV. Optionally, the reverse bias voltage value required by a single solar cell 510 is 10V to 50V.

[0165] In the step of using a laser to perform laser-induced sintering on the silver grid line on the back of the solar cell string, and using a compensation light source to irradiate the front of the solar cell string to supplement carriers, the laser wavelength emitted by the laser is 500nm to 1200nm, and the power density of the laser emitted by the laser is 10kW / m 2 ~10000kW / m 2 The scanning rate of the laser emitted by the laser is 26m / s~65m / s. The power density of the light emitted by the compensation light source is 5kW / m 2 ~100kW / m 2 The inventor's research shows that the laser emitted by the above laser is used for laser induced sintering, and the light emitted by the above compensation light source is used to supplement carriers, which can improve the efficiency of the solar cell string after welding.

[0166] In a third aspect, an embodiment of the present application discloses a solar cell string, which is processed using the solar cell string processing system as described in the first aspect, or processed by the processing method as described in the second aspect.

[0167] As an optional implementation, refer to Fig.15 and Fig.16 The solar cell sheet 510 in the solar cell string 500 is a back-contact solar cell, which includes a silicon substrate 513, which has a front side 511 and a back side 512, and a silver grid line 514 is arranged on the back side 512. Since the silver grid lines 514 are arranged only on the back side 512 of the back-contact solar cell, the silver grid lines 514 are too dense, which leads to a large light shielding area of ​​the silver grid lines 514. The number of carriers generated when the laser performs laser induced sintering on the back side 512 is limited. The solar cell string processing system described in the first aspect is used for processing, or the processing method described in the second aspect is used for processing, and in more detail, the front side is irradiated with a compensation light source to supplement the carriers, thereby solving the problem of insufficient carriers excited in the laser induced sintering process due to the excessive density of the silver grid lines 514 on the back side 512.

[0168] In a fourth aspect, an embodiment of the present application discloses a photovoltaic module, comprising a solar cell string as described in the third aspect.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A solar cell string processing system, characterized in that: The solar cell string processing system comprises: A supporting structure having a placement surface for placing a solar cell string; An external voltage loading device, the external voltage loading device is used to apply a reverse bias voltage to the solar cell string; a laser configured to perform laser induced sintering of the silver grid lines on the back side of the solar cell string; and The compensation light source is configured to illuminate the front side of the solar cell string.

2. The solar cell string processing system according to claim 1, characterized in that: The solar cell string processing system also includes: A transport mechanism, the transport mechanism being configured to transport the solar cell string to the placement surface along a first direction and a second direction, and to transport the solar cell string away from the placement surface; The first direction is the transmission direction of the solar cell string, and the second direction is a direction perpendicular to the placement surface.

3. The solar cell string processing system according to claim 2, characterized in that: The placement surface has a first side edge and a second side edge which are arranged opposite to each other in a direction perpendicular to the first direction; The transport mechanism comprises: a first displacement assembly and a first carrier platform located at the first side, wherein the first displacement assembly is connected to the first carrier platform to drive the first carrier platform to displace in the first direction and the second direction; a second displacement assembly and a second carrier platform located at the second side, wherein the second displacement assembly is connected to the second carrier platform to drive the second carrier platform to displace in the first direction and the second direction; The first carrier platform and the second carrier platform both have a first position. The first carrier platform located at the first position is butted against the first side edge, and the second carrier platform located at the first position is butted against the second side edge.

4. The solar cell string processing system according to claim 3, characterized in that: At the first side, the bearing structure has a first fitting inclined surface inclined toward the first carrying platform; At the second side edge, the bearing structure has a second fitting inclined surface inclined toward the second carrier platform; A third fitting slope is provided on a side of the first carrier platform close to the placement surface, and when the first carrier platform is located at the first position, the third fitting slope fits with the first fitting slope; A fourth fitting slope is provided on a side of the second carrier platform close to the placement surface. When the second carrier platform is located at the first position, the fourth fitting slope fits with the second fitting slope.

5. The solar cell string processing system according to claim 3, characterized in that: The second direction is a vertical direction; The first carrier platform has a first step surface formed by sinking, and the second carrier platform has a second step surface formed by sinking; When the first carrier platform and the second carrier platform are located at the first position, the first step surface is connected to the first side edge, and the second step surface is connected to the second side edge. The first step surface is configured to place the first edge of the solar cell string, and the second step surface is configured to place the second edge of the solar cell string opposite to the first edge.

6. The solar cell string processing system according to claim 5, characterized in that: A first shaping slope is provided on the first carrier platform, the bottom end of the first shaping slope is connected to the first step surface, and the top end of the first shaping slope is inclined in a direction away from the first step surface; And / or, a second shaping slope is provided on the second carrier platform, the bottom end of the second shaping slope is connected to the second step surface, and the top end of the second shaping slope is inclined in a direction away from the second step surface.

7. The solar cell string processing system according to claim 3, characterized in that: The first displacement assembly includes a first linear motor, a first slide and a first cylinder, the first slide is connected to the first linear motor, and the first linear motor is configured to drive the first slide to move along the first direction; the first cylinder is arranged on the first slide, and the first cylinder is configured to drive the first carrier to move along the second direction; And / or, the second displacement assembly includes a second linear motor, a second slide and a second cylinder, the second slide is connected to the second linear motor, the second linear motor is configured to drive the second slide to move along the first direction; the second cylinder is arranged on the second slide, the second cylinder is configured to drive the second carrier to move along the second direction; And / or, both the first carrier stage and the second carrier stage are light-transmitting carrier stages.

8. The solar cell string processing system according to any one of claims 3 to 7, characterized in that: The solar cell string processing system further includes a loading conveyor belt and a unloading conveyor belt, wherein the loading conveyor belt and the unloading conveyor belt are both configured to convey the solar cell string along the first direction; The first carrier platform and the second carrier platform that are displaced also have a second position and a third position, the first carrier platform and the second carrier platform located at the second position are respectively located at the outer sides of two opposite sides of the loading conveyor belt, and the first carrier platform and the second carrier platform located at the third position are respectively located at the outer sides of two opposite sides of the unloading conveyor belt; And / or, the first direction is a horizontal direction.

9. The solar cell string processing system according to claim 1, characterized in that: The solar cell string processing system also includes: A heat dissipation device is arranged corresponding to the placement surface to dissipate heat for the solar cell string on the placement surface.

10. The solar cell string processing system according to claim 9, characterized in that: The heat dissipation device comprises a heat dissipation fan, and the heat dissipation fan is arranged opposite to the placement surface to perform air cooling and apply pressure to the solar cell string.

11. The solar cell string processing system according to claim 10, characterized in that: There are multiple cooling fans, and the multiple cooling fans are distributed above the placement surface.

12. The solar cell string processing system according to any one of claims 9 to 11, characterized in that: The solar cell string processing system also includes a third displacement component and a fourth displacement component; The third displacement component is connected to the laser to drive the laser to displace in a first direction and a second direction; The fourth displacement component is connected to the external voltage loading device to drive the external voltage loading device to displace in a first direction and a second direction; The third displacement component and / or the fourth displacement component is connected to the heat sink to drive the heat sink to displace in the second direction; The first direction is the transmission direction of the solar cell string, and the second direction is a direction perpendicular to the placement surface.

13. The solar cell string processing system according to claim 12, characterized in that: The third displacement assembly includes a third linear motor, a first mounting seat, a fourth linear motor and a first bracket; the first mounting seat is connected to the third linear motor, and the third linear motor is configured to drive the first mounting seat to displace along the second direction; the fourth linear motor is arranged on the first mounting seat, the first bracket is connected to the fourth linear motor, and the fourth linear motor is configured to drive the first bracket to displace along the first direction, and the laser is arranged on the first bracket; The fourth displacement assembly includes a fifth linear motor, a second mounting seat, a sixth linear motor and a second bracket; the second mounting seat is connected to the fifth linear motor, and the fifth linear motor is configured to drive the second mounting seat to displace along the second direction; the sixth linear motor is arranged on the second mounting seat, the second bracket is connected to the sixth linear motor, and the sixth linear motor is configured to drive the second bracket to displace along the first direction, and the external voltage loading device is arranged on the second bracket.

14. The solar cell string processing system according to claim 13, characterized in that: The heat dissipation device also includes a frame, the heat dissipation fan is arranged on the frame, two opposite sides of the frame are respectively fixedly connected to the first mounting seat and the second mounting seat, and the first mounting seat and the second mounting seat are configured to rise and fall synchronously to drive the frame to rise and fall.

15. The solar cell string processing system according to any one of claims 1 to 7 or 9 to 11, characterized in that: The bearing structure comprises a box body, a mounting cavity is defined in the box body, the compensation light source is arranged in the mounting cavity, a light-transmitting cover is provided on the box body, and the placement surface is the outer surface of the light-transmitting cover; The placement surface is configured to fit the front surface of the solar cell string so that the compensation light source illuminates the front surface of the solar cell string from below the placement surface; The laser and the external voltage loading device are both located above the placement surface.

16. The solar cell string processing system according to any one of claims 1 to 7, or 9 to 11, characterized in that: The external voltage loading device is an elastic probe row; And / or, the compensation light source is a lamp tube; And / or, the solar cell string processing system further comprises a working platform, and the bearing structure, the external voltage loading device, the laser and the compensation light source are all arranged on the working platform; And / or, the external voltage loading device and the laser are respectively arranged on two opposite sides of the bearing structure.

17. A method for processing a solar cell string, characterized in that: The solar cell string is processed using the solar cell string processing system according to any one of claims 1 to 16, and the processing method comprises the following steps: Placing the solar cell string on the placement surface of the supporting structure; Applying a reverse bias voltage to the solar cell string using the external voltage loading device; The laser is used to perform laser-induced sintering on the silver grid lines on the back side of the solar cell string, and a compensation light source is used to irradiate the front side of the solar cell string to supplement carriers.

18. The method for processing a solar cell string according to claim 17, characterized in that: In the step of applying a reverse bias voltage to the solar cell string by the external voltage loading device, the voltage value of the applied reverse bias voltage is the product of the reverse bias voltage value required by a single solar cell in the solar cell string and the number of solar cells in series; And / or, in the step of using the laser to perform laser induced sintering on the silver grid lines on the back side of the solar cell string, and simultaneously using a compensation light source to irradiate the front side of the solar cell string to supplement carriers, the laser wavelength emitted by the laser is 500nm to 1200nm, and the power density of the laser emitted by the laser is 10kW / m 2 ~10000kW / m 2 The scanning rate of the laser emitted by the laser is 26m / s to 65m / s, and the power density of the light emitted by the compensation light source is 5kW / m 2 ~100kW / m 2 .

19. A solar cell string, characterized in that: The solar cell string is processed by using the solar cell string processing system according to any one of claims 1 to 16, or is processed by the processing method according to claim 17 or 18.

20. The solar cell string according to claim 19, characterized in that: The solar cell sheets in the solar cell string are back-contact solar cells. The back-contact solar cells include a silicon substrate having a front side and a back side. The silver grid lines are arranged on the back side.

21. A photovoltaic module, characterized in that: Comprising the solar cell string as claimed in claim 19 or 20.

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