A solar cell string and processing equipment and method thereof, and photovoltaic module

Abstract

The present application relates to the technical field of solar cell string processing equipment, and in particular to a solar cell string and its processing equipment and method, and a photovoltaic module. The processing equipment includes a processing platform, a voltage loading mechanism, and a light source assembly. The processing platform is configured to place a number of series-connected conductive parts and a number of solar cells; each solar cell has a first electrode on the side facing the processing platform, and each series-connected conductive part includes a number of first series-connected segments, which are pressed between the processing platform and the first electrode. The electrical connector is configured to contact the first series-connected segments and electrically connect the solar cells through the first electrode. The light source assembly is configured to perform laser-induced sintering on the solar cells and to weld the first series-connected segments to the first electrodes on the solar cells. The processing equipment reduces the power loss caused by the series welding by superimposing laser-induced sintering during the series welding process.

Description

Technical Field

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

[0002] A solar cell string is made by welding a plurality of solar cells in series. During the welding process, the solar cells are prone to heat loss, and the fill factor and series resistance of the solar cells decrease, resulting in power loss of the solar cell string, which in turn leads to poor power of the photovoltaic modules made using the solar cell string. Summary of the invention

[0003] The embodiments of the present application disclose a solar cell string and its processing equipment and method, and a photovoltaic module, which can reduce the power loss caused by string welding through laser induced sintering, and do not need to use additional laser sintering equipment to perform laser induced sintering separately before or after string welding, thereby improving processing efficiency.

[0004] In order to achieve the above-mentioned purpose, in a first aspect, an embodiment of the present application discloses a processing device for a solar cell string, the processing device comprising:

[0005] A processing platform, wherein the processing platform is configured to place a plurality of series-connected conductive members and a plurality of the solar cells; wherein each of the solar cells has a first electrode on a surface facing the processing platform, and each of the series-connected conductive members includes a plurality of first series-connected segments, wherein the first series-connected segments are pressed between the processing platform and the first electrode;

[0006] a voltage loading mechanism, comprising a plurality of electrical connectors, wherein the electrical connectors are configured to contact the first series segment and electrically connect the solar cell through the first electrode; and

[0007] A light source assembly is configured to perform laser induced sintering on the solar cells and to weld a plurality of the first series segments to the first electrodes on a plurality of the solar cells.

[0008] In a possible implementation of the first aspect, the voltage loading mechanism further includes a press, the press includes a plurality of probe rows, the solar cell has a second electrode on a side facing away from the processing platform, each of the series conductive members further includes a second series segment connected to the first series segment, the second series segment is placed on a side of the solar cell facing away from the processing platform, and the probe row is configured to press a plurality of the second series segments onto a plurality of the second electrodes, so as to electrically connect each of the solar cells through each of the second electrodes;

[0009] The light source assembly is further configured to weld a plurality of the second series segments on the processing platform and a plurality of second electrodes on the solar cells.

[0010] In a possible implementation of the first aspect, the probe row includes:

[0011] A bracket, wherein the bracket is provided with a plurality of through holes arranged at intervals;

[0012] a plurality of first springs, each of which is disposed in each of the through holes; and

[0013] A plurality of conductive probes, each of which is respectively inserted into each of the through holes and penetrates each of the first springs, one end of the first spring is fixed in the through hole and the other end is connected to the conductive probe, the conductive probe has a first end and a second end which are arranged opposite to each other, each of the first springs is configured to drive each of the first ends to protrude out of each of the through holes and press each of the second series segments, each of the second ends is provided with a limiting structure, and each of the limiting structures is configured to limit each of the second ends on the bracket.

[0014] In a possible implementation of the first aspect, the press is movably arranged between the light source assembly and the processing platform; there are a plurality of probe rows, the plurality of probe rows are arranged at intervals, and a light-transmitting gap is enclosed between two adjacent probe rows, and the light-transmitting gap is configured to transmit light emitted from the light source assembly to the processing platform;

[0015] A plurality of connection structures are provided between adjacent probe rows. The connection structures cross the light-transmitting gaps and two ends of the connection structures are respectively fixedly connected to two probe rows.

[0016] In a possible implementation of the first aspect, the press further includes a mounting assembly, each of the probe rows is disposed on the mounting assembly, a first power connection structure is disposed on the mounting assembly, each of the probe rows is electrically connected to the first power connection structure, a second power connection structure is disposed on the processing platform, the second power connection structure and the electrical connector are configured to be electrically connected to the positive and negative poles of an external power supply, respectively, and the second power connection structure is further configured to dock with the first power connection structure.

[0017] In a possible implementation of the first aspect, the mounting assembly includes two mounting side frames arranged opposite to each other, and two ends of each probe row are respectively fixedly connected to the two mounting side frames; a plurality of the first power connection structures are arranged on a side of each mounting side frame away from the probe row, and a plurality of the second power connection structures are arranged on both sides of the processing platform;

[0018] And / or, the first power connection structure is a conductive protrusion, and the second power connection structure is a conductive probe.

[0019] In a possible implementation of the first aspect, the light source assembly includes a plurality of laser light sources and a plurality of infrared light sources, the laser light sources are configured to perform laser-induced sintering on the solar cells on the processing platform, and the infrared light sources are configured to weld the first series segment on the processing platform and the first electrodes on the plurality of solar cells.

[0020] In a possible implementation of the first aspect, the processing platform is a conveyor belt, and in a conveying direction of the conveyor belt, the laser light source and the infrared light source are alternately arranged;

[0021] And / or, the light source assembly is located above the processing platform, and the laser light source and the infrared light source are staggered in the vertical direction;

[0022] And / or, the light source assembly further comprises a light box, and the laser light source and the infrared light source are both arranged in the light box;

[0023] And / or, the laser light source is a laser lamp tube;

[0024] And / or, the infrared light source is an infrared lamp tube.

[0025] In a possible implementation of the first aspect, the processing platform has a placement surface, and the placement surface is configured to place a plurality of the series conductive members and a plurality of the solar cells. The electrical connector is arranged corresponding to the placement surface, and the electrical connector is configured to contact a side of the first series segment facing the placement surface.

[0026] In a possible implementation of the first aspect, the processing platform is a conveyor belt, and the conveyor belt is provided with a plurality of rows of openings, each row of the openings includes a plurality of the openings, and the plurality of rows of openings are arranged at intervals along the rotation direction of the conveyor belt;

[0027] The plurality of electrical connectors are configured to be disposed corresponding to one row of the openings when the conveyor belt is stationary, and the plurality of electrical connectors extend into the plurality of openings and are exposed on the placement surface to contact the first series segment.

[0028] In a possible implementation of the first aspect, the voltage loading mechanism also includes a lifting platform, the placement surface is the top surface of the conveyor belt, the electrical connectors are correspondingly arranged on the lower side of the placement surface, each of the electrical connectors is driven and connected to the lifting platform, and the lifting platform is configured to drive a number of the electrical connectors to lift and retract relative to the opening on the placement surface.

[0029] In a possible implementation of the first aspect, the voltage loading mechanism further includes a plurality of second springs, a socket is provided on the lifting platform, each of the second springs is arranged on the lifting platform and corresponds to each of the sockets, each of the electrical connectors is inserted into each of the second springs, and the bottom end of the electrical connector is inserted into each of the sockets, two ends of the second springs respectively abut against the top surface of the lifting platform and the electrical connector, and each of the second springs is configured to lift each of the electrical connectors upward;

[0030] The lifting platform is also provided with a plurality of anti-collision grooves, each of which is located below each of the sockets and is connected to each of the sockets, and the bottom end of the electrical connector is movably arranged in the anti-collision groove.

[0031] In a second aspect, an embodiment of the present application discloses a method for processing a solar cell string, using the processing equipment as described in the first aspect, the processing method comprising the following steps:

[0032] Unloading: placing the solar cell and the series conductive member on the processing platform; wherein each of the series conductive members comprises a plurality of first series segments, and each of the first series segments is pressed between the processing platform and each of the first electrodes;

[0033] Loading a reverse bias voltage: the electrical connector contacts the first series segment and is electrically connected to the solar cell through the first electrode, and an external power source loads a reverse bias voltage to each of the solar cells through the electrical connector;

[0034] Laser induced sintering and series welding: the light source assembly performs laser induced sintering on the solar cells, and welds the first series segment and the first electrodes on a plurality of the solar cells.

[0035] In a possible implementation of the second aspect, the solar cell further comprises a second electrode disposed opposite to the first electrode; the series conductive member further comprises a second series segment connected to the first series segment;

[0036] The step of discharging the material also includes:

[0037] The second electrode is located at a side of the solar cell away from the processing platform, and the second series segment is placed at a side of the solar cell away from the processing platform;

[0038] The step of loading the reverse bias voltage also includes:

[0039] Using a probe row of a press to press a plurality of the second series segments onto a plurality of the second electrodes, the probe row is electrically connected to each of the solar cells through each of the second electrodes, and the external power source applies a reverse bias voltage to each of the solar cells through the probe row;

[0040] The laser induced sintering and string welding steps further include:

[0041] The light source assembly welds the second series segment and the second electrode.

[0042] In a possible implementation of the second aspect, the light source assembly includes a laser light source and an infrared light source. The frequency of the laser emitted by the laser light source is 100kHz to 500kHz, the scanning speed is 5m / s to 15m / s, and the peak energy is 5J / cm 2 ~15J / cm 2 , the duration of laser induced sintering is 1s to 3s; the wavelength range of the infrared light emitted by the infrared light source is 0.76μm to 1.6μm, the power is 1kW to 2kW, and the welding time is 0.5s to 1s;

[0043] And / or, the first electrode includes a first main grid, the first series segment is placed along the length direction of the first main grid, and the width of the first series segment is greater than or equal to the width of the first main grid;

[0044] And / or, the second electrode includes a second main grid, the second series segment is placed along the length direction of the second main grid, and the width of the second series segment is greater than or equal to the width of the second main grid.

[0045] In a third aspect, an embodiment of the present application discloses a solar cell string, wherein the solar cell string is processed by the processing equipment as described in the first aspect, or the solar cell string is processed by the processing method as described in the second aspect;

[0046] The solar cell string includes a plurality of solar cells and a plurality of series conductive members, the first series segment is welded to the first electrode of the solar cell, and the series conductive member is configured to connect the plurality of solar cells in series.

[0047] In a possible implementation of the third aspect, each of the solar cells further has a second electrode arranged opposite to the first electrode, the series conductive member further includes a second series segment connected to the first series segment, the first series segment of each of the series conductive members is welded to the first electrode of one of the solar cells and the second series segment is welded to the second electrode of another solar cell.

[0048] 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.

[0049] Compared with the prior art, the beneficial effects of the present application are: the processing platform of the processing equipment is used to place a plurality of solar cells and a plurality of series-connected conductive members, and the first electrode of the solar cell on one side of the processing platform is pressed with the first series-connected segment of the series-connected conductive member, so that the two are relatively fixedly placed on the processing platform.

[0050] The electrical connector of the processing equipment is used to apply a reverse bias voltage to the solar cell. Specifically, the electrical connector contacts the first series segment, and the first series segment is pressed together with the first electrode. In other words, the electrical connector can electrically connect a plurality of solar cells through the series conductive member. The external power supply can apply a reverse bias voltage to the plurality of solar cells by contacting the first series segment through the electrical connector, thereby solving the technical problem that it is difficult to apply a reverse bias voltage to the solar cell during the series welding process, and thus laser induced sintering can be performed simultaneously during the series welding process.

[0051] The light source component of the processing equipment is used for laser-induced sintering of solar cells and welding of series-connected conductive parts and solar cells to form a solar cell string.

[0052] In summary, by superimposing laser induced sintering during the string welding process, the processing equipment can reduce the power loss caused by string welding through laser induced sintering, and does not need to use additional laser sintering equipment to perform laser induced sintering separately before or after string welding, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] 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.

[0054] Figure 1 It is a structural schematic diagram of the processing equipment disclosed in the embodiment of the present application;

[0055] Figure 2 A schematic diagram of the working state of the processing equipment disclosed in the embodiment of the present application;

[0056] Figure 3 for Figure 2 A partial enlarged view of area A shown in FIG;

[0057] Figure 4 A schematic diagram of the structure of a processing platform disclosed in an embodiment of the present application;

[0058] Figure 5 Another structural schematic diagram of the processing equipment disclosed in the embodiment of the present application;

[0059] Figure 6 for Figure 5 A local enlarged view of the B area shown in FIG.

[0060] Figure 7 Another working schematic diagram of the processing equipment disclosed in the embodiment of the present application;

[0061] Figure 8 for Figure 7 A local enlarged view of the C region shown in FIG.

[0062] Fig. 9 It is a schematic diagram of the structure of the pressing tool disclosed in the embodiment of the present application;

[0063] Fig.10 A schematic diagram of the structure of a light source assembly disclosed in an embodiment of the present application;

[0064] Fig.11 A schematic diagram of the structure of a solar cell string disclosed in an embodiment of the present application;

[0065] Fig.12 Another structural schematic diagram of the solar cell string disclosed in the embodiment of the present application.

[0066] Description of reference numerals:

[0067] 100, processing equipment; 110, processing platform; 111, second power connection structure; 112, opening; 113, placement surface; 120, voltage loading mechanism; 121, electrical connector; 122, press; 123, probe row; 1231, bracket; 1232, first spring; 1233, conductive probe; 1234, through hole; 1235, first end; 1236, second end; 1237, limit structure; 124, light-transmitting gap; 125, connection structure; 126, installation Component; 1261, mounting side frame; 127, first power connection structure; 128, lifting platform; 1281, socket; 1282, anti-collision groove; 129, second spring; 130, light source component; 131, laser light source; 132, infrared light source; 133, light box; 200, solar cell string; 210, series conductive member; 211, first series section; 212, second series section; 220, solar cell; 221, first electrode; 222, second electrode; 300, external power supply. DETAILED DESCRIPTION

[0068] 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.

[0069] In the present application, the terms "upper", "lower", "top", "bottom", "inner", "vertical", "horizontal" 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The laser induced sintering process is the cell-side process of solar cells, while the string welding process is the module-side process of solar cells. Since the processing conditions of laser induced sintering and string welding are different, the two processes are generally carried out separately, that is, laser induced sintering is first performed by laser sintering equipment, and then string welding is performed by string welding equipment. However, during the string welding process of solar cells, solar cells are prone to heat loss, and the fill factor and series resistance of solar cells decrease, which in turn leads to power loss of solar cell strings. Even if the solar cells at the cell end have a significant improvement in efficiency after laser induced sintering, the solar cells at the module end have no significant improvement in efficiency after string welding.

[0074] Based on the above analysis, an embodiment of the present application provides a processing device, which can reduce the power loss caused by string welding through laser induced sintering by superimposing laser induced sintering during the string welding process, and does not need to use additional laser sintering equipment to perform laser induced sintering separately before or after the string welding, thereby improving the processing efficiency.

[0075] The technical solution of the present invention will be described below in conjunction with embodiments and drawings.

[0076] First, please combine Figures 1 to 3 The embodiment of the present application discloses a solar cell string processing device 100 , which includes a processing platform 110 , a voltage loading mechanism 120 and a light source assembly 130 .

[0077] The processing platform 110 is configured to place a plurality of series-connected conductive elements 210 and a plurality of solar cells 220. Each solar cell 220 has a first electrode 221 on a side facing the processing platform 110, and each series-connected conductive element 210 includes a plurality of first series-connected segments 211, which are pressed between the processing platform 110 and the first electrode 221.

[0078] The voltage loading mechanism 120 includes a plurality of electrical connectors 121 , and the electrical connectors 121 are configured to contact the first series segment 211 and be electrically connected to the solar cell 220 through the first electrode 221 .

[0079] The light source assembly 130 is configured to perform laser induced sintering on the solar cells 220 and to weld the first series segments 211 to the first electrodes 221 on the solar cells 220 .

[0080] The processing platform 110 of the processing equipment 100 is used to place a plurality of solar cells 220 and a plurality of series-connected conductive members 210 , and to press the first electrode 221 of the solar cell 220 on one side of the processing platform 110 with the first series segment 211 , so that the two are relatively fixedly placed on the processing platform 110 .

[0081] It should be noted that the processing platform 110 can be a fixed platform or a movable platform, such as a conveyor belt. The series conductive member 210 can be a series conductive wire or a series conductive belt, such as a welding belt. The electrical connector 121 can be an electrical connection column, an electrical connection block or an electrical connection contact. The light source assembly 130 can be fixed at a position relative to the processing platform 110, or moved to a position relative to the processing platform 110 at the beginning of processing. The setting method of the light source assembly 130 in this application is not limited to this, as long as the light emitted by the light source assembly 130 can act on the first electrode 221 and the first series segment 211 on the processing platform 110.

[0082] The electrical connector 121 of the processing equipment 100 is used to apply a reverse bias voltage to the solar cell 220. Specifically, the electrical connector 121 contacts the first series segment 211, and the first series segment 211 is pressed together with the first electrode 221. In other words, the electrical connector 121 can electrically connect a plurality of solar cells 220 through the series conductive member 210 and the first electrode 221 in sequence. The external power supply 300 can apply a reverse bias voltage to a plurality of solar cells 220 by contacting the first series segment 211 through the electrical connector 121, which solves the technical problem that it is difficult to apply a reverse bias voltage to the solar cell 220 during the series welding process, and thus can simultaneously implement laser induced sintering during the series welding process.

[0083] For example, refer to Figure 3 When the solar cell 220 is a back-contact solar cell, the back side of the back-contact solar cell faces the processing platform 110, and the first electrode 221 includes a positive grid line and a negative grid line. The series conductive member 210 includes two connected first series segments 211. One of the first series segments 211 of the series conductive member 210 is connected to the positive grid line of a back-contact solar cell, and the other first series segment 211 is connected to the negative grid line of another back-contact solar cell, thereby realizing the series connection of two back-contact solar cells. The electrical connector 121 contacts the first series segment 211 and then applies a reverse bias voltage to the back-contact solar cell. In more detail, there are multiple electrical connectors 121, some of which are electrically connected to the positive electrode of the external power supply, and some of which are electrically connected to the negative electrode of the external power supply. When in contact, some of the electrical connectors 121 contact the positive grid line of the back-contact solar cell, and some of the electrical connectors 121 contact the negative grid line of the back-contact solar cell to load a reverse bias voltage on the back-contact solar cell.

[0084] The light source assembly 130 of the processing equipment 100 is used for laser induced sintering of the solar cell 220 and welding the series conductive member 210 and the solar cell 220 to form a solar cell string.

[0085] In the laser induced sintering process, the solar cell 220 is placed under a reverse bias voltage and then locally irradiated by a laser. The laser generates electron-hole pairs, which are quickly separated by the strong electric field generated by the reverse bias voltage in the solar cell 220, thereby generating a photogenerated current that runs through an external circuit. This high current can only flow to the microscopic local areas where the silicon is in direct contact with the first electrode 221. These areas still have a high contact resistance and are subjected to high currents, resulting in a highly localized heating situation. This local heating can significantly reduce the contact resistance between the silicon and the first electrode 221.

[0086] In summary, the processing equipment 100 can reduce the power loss caused by string welding through laser induced sintering by superimposing laser induced sintering during the string welding process, and does not need to use additional laser sintering equipment to perform laser induced sintering separately before or after the string welding, thereby improving the processing efficiency.

[0087] In some embodiments, see Figure 2 and Figure 3 The processing platform 110 has a placement surface 113, and the placement surface 113 is configured to place a plurality of series-connected conductive members 210 and a plurality of solar cells 220. The electrical connector 121 is disposed corresponding to the placement surface 113, and the electrical connector 121 is configured to contact the side of the first series segment 211 facing the placement surface 113. Since the first electrode 221 is located on the side of the first series segment 211 away from the placement surface 113, the electrical connector 121 can not only electrically connect the first electrode 221 through the first series segment 211, but also make the first series segment 211 and the first electrode 221 in close contact.

[0088] Alternatively, if Figure 1 and Figure 4 As shown, the processing platform 110 is a conveyor belt, and a plurality of rows of openings 112 are provided on the conveyor belt. Each row of openings 112 includes a plurality of openings 112. The plurality of rows of openings 112 are arranged at intervals along the rotation direction of the conveyor belt. The rotation direction of the conveyor belt is as shown in FIG. Figure 4 The direction X is shown. The plurality of electrical connectors 121 are configured to be disposed corresponding to one row of openings 112 when the conveyor belt is stationary. The plurality of electrical connectors 121 extend into the plurality of openings 112 and are exposed on the placement surface 113 to contact the first series section 211 .

[0089] The plurality of electrical connectors 121 are configured to be disposed correspondingly to one row of openings 112 when the conveyor belt is stationary. It is understood that the plurality of rows of openings 112 can enable the plurality of electrical connectors 121 to be disposed correspondingly to one row of openings 112 when the conveyor belt rotates less than one circle. The plurality of electrical connectors 121 extend into the plurality of openings 112 to be exposed on the surface of the conveyor belt and abut against the first series section 211. The electrical connectors 121 are disposed correspondingly to the openings 112 one by one, or a plurality of electrical connectors 121 are disposed correspondingly to one opening 112.

[0090] Furthermore, if Figure 1 and Figure 3 As shown, the voltage loading mechanism 120 also includes a lifting platform 128, the placement surface 113 is the top surface of the conveyor belt, and the electrical connectors 121 are correspondingly arranged on the lower side of the placement surface 113. Each electrical connector 121 is driven to connect to the lifting platform 128. The lifting platform 128 is configured to drive a plurality of electrical connectors 121 to move up and down and to extend and retract relative to the opening 112 on the placement surface 113. The lifting direction is as shown in FIG. Figure 3 The Z0-Z1 direction is shown.

[0091] When the lifting platform 128 drives the electrical connector 121 to rise, the electrical connector 121 extends into the opening 112. When the lifting platform 128 drives the electrical connector 121 to descend, the electrical connector 121 retracts from the opening 112.

[0092] Optionally, the lifting platform 128 may be a pneumatic lifting platform, a hydraulic lifting platform, or an electric lifting platform.

[0093] Alternatively, if Figure 3 As shown, the voltage loading mechanism 120 also includes a plurality of second springs 129, and a socket 1281 is provided on the lifting platform 128. Each second spring 129 is arranged on the lifting platform 128 and corresponds to each socket 1281. Each electrical connector 121 is inserted into each second spring 129, and the bottom end of the electrical connector 121 is inserted into each socket 1281. The two ends of the second spring 129 respectively abut against the top surface of the lifting platform 128 and the electrical connector 121, and each second spring 129 is configured to lift each electrical connector 121 upward.

[0094] When the electrical connector 121 contacts the first series segment 211, the electrical connector 121 is pressed downward to compress the second spring 129, and the second spring 129 plays an elastic buffering role to reduce the probability of the solar cell 220 being damaged by the electrical connector 121. The second spring 129 also continuously applies a lifting force on the electrical connector 121 to keep the electrical connector 121 in contact with the first series segment 211.

[0095] The lifting platform 128 is also provided with a plurality of anti-collision grooves 1282, each of which is located below each of the plug holes 1281 and is connected to each of the plug holes 1281, and the bottom end of the electrical connector 121 is movably arranged in the anti-collision groove 1282. When the electrical connector 121 contacts the first series section 211, the electrical connector 121 is forced to move downward, and the anti-collision groove 1282 serves as a buffer space. The anti-collision groove 1282 allows the bottom end of the electrical connector 121 to be inserted, so as to reduce the rigid contact between the electrical connector 121 and the solar cell 220, and reduce the probability of the solar cell 220 being damaged by the electrical connector 121.

[0096] In some embodiments, see Figures 5 to 8 The voltage loading mechanism 120 also includes a press 122, the press 122 includes a plurality of probe rows 123, the solar cell 220 has a second electrode 222 on the side away from the processing platform 110, each series conductive member 210 also includes a second series segment 212 connected to the first series segment 211, the second series segment 212 is placed on the side of the solar cell 220 away from the processing platform 110, and the probe row 123 is configured to press the plurality of second series segments 212 onto the plurality of second electrodes 222 to electrically connect each solar cell 220 through each second electrode 222.

[0097] The light source assembly 130 is further configured to weld the plurality of second series segments 212 on the processing platform 110 and the second electrodes 222 on the plurality of solar cells 220 .

[0098] When the solar cell 220 is a double-sided electrode solar cell, the voltage loading mechanism 120 electrically connects the first electrode 221 and the second electrode 222 of the solar cell 220 through the electrical connector 121 and the press 122, respectively, so as to load a reverse bias voltage on the double-sided electrode solar cell. Exemplarily, the double-sided electrode solar cell is, for example, a tunnel oxide passive contact solar cell (TOPcon Solar Cell).

[0099] One of the functions of the press 122 is to press the plurality of second series segments 212 onto the plurality of second electrodes 222 through the probe row 123, so as to prevent the second series segments 212 from being deformed and offset due to heat during welding. The probe row 123 makes the second series segments 212 and the second electrodes 222 relatively fixed, thereby improving the welding effect. On the other hand, after the solar cell 220 is subjected to the pressure of the press 122, the pressing effect of the first electrode 221 and the first series segment 211 is also better.

[0100] Another function of the press 122 is to electrically connect the second series segment 212 through the probe row 123 and then electrically connect the second electrodes 222 of the plurality of solar cells 220, so that the external power source 300 applies a reverse bias voltage to the double-sided electrode solar cell through the probe row 123. Specifically, one of the positive and negative electrodes of the external power source 300 is electrically connected to the first electrode 221 through the plurality of electrical connectors 121, and the other of the positive and negative electrodes of the external power source 300 is electrically connected to the second electrode 222 through the plurality of probe rows 123, thereby applying a reverse bias voltage to the double-sided electrode solar cell, thereby realizing the series welding and simultaneous laser induced sintering of the double-sided electrode solar cell.

[0101] Optionally, the probe row 123 includes a bracket 1231, a plurality of first springs 1232 and a plurality of conductive probes 1233. The bracket 1231 is provided with a plurality of through holes 1234 arranged at intervals. Each first spring 1232 is respectively arranged in each through hole 1234. Each conductive probe 1233 is respectively penetrated in each through hole 1234 and penetrates each first spring 1232. One end of the first spring 1232 is fixed in the through hole 1234 and the other end is connected to the conductive probe 1233. The conductive probe 1233 has a first end 1235 and a second end 1236 arranged opposite to each other. Each first spring 1232 is configured to drive each first end 1235 to protrude from each through hole 1234 and press each second series section 212. Each second end 1236 is provided with a limiting structure 1237. Each limiting structure 1237 is configured to limit each second end 1236 on the bracket 1231.

[0102] The probe row 123 has an elastic contact effect. When the first end 1235 is pressed against the second series segment 212, the first end 1235 partially retracts into the through hole 1234, and the first spring 1232 is compressed. The first spring 1232 weakens the force of the first end 1235 on the solar cell 220, thereby preventing the solar cell 220 from being damaged when being pressed against by the first end 1235. When the first end 1235 is separated from the second series segment 212, the first spring 1232 restores its original length, the conductive probe 1233 is moved under force, and the first end 1235 protrudes out of the through hole 1234 until the limiting structure 1237 abuts against the bracket 1231.

[0103] Optionally, combine Figure 5 and Fig. 9 The press 122 is movably disposed between the light source assembly 130 and the processing platform 110. There are a plurality of probe rows 123, and the plurality of probe rows 123 are arranged at intervals. A light-transmitting gap 124 is enclosed between two adjacent probe rows 123. The light-transmitting gap 124 is configured to transmit light emitted from the light source assembly 130 to the processing platform 110. The light emitted by the light source assembly 130 can be irradiated on the solar cell 220 and the series conductive member 210 through the light-transmitting gap 124 to implement welding and laser-induced sintering.

[0104] like Fig. 9 As shown, a plurality of connecting structures 125 are also provided between adjacent probe rows 123, and the connecting structures 125 are transverse to the light-transmitting gap 124 and the two ends of the connecting structures 125 are respectively fixedly connected to the two probe rows 123. Exemplarily, the connecting structure 125 can be a connecting plate or a connecting block. The probe rows 123 are long strips of objects, which are easily damaged by force in the length direction, and the connecting structures 125 are used to enhance the structural strength of the probe rows 123, specifically to enhance the structural strength of the bracket 1231, and the connecting structures 125 enable multiple probe rows 123 to be connected as one, thereby increasing the overall strength of the press 122.

[0105] Furthermore, please combine Figures 5 to 8 The press 122 also includes a mounting assembly 126, each probe row 123 is arranged on the mounting assembly 126, a first power connection structure 127 is arranged on the mounting assembly 126, each probe row 123 is electrically connected to the first power connection structure 127, a second power connection structure 111 is arranged on the processing platform 110, the second power connection structure 111 and the electrical connector 121 are configured to be electrically connected to the positive and negative poles of the external power supply 300 respectively, and the second power connection structure 111 is also configured to dock with the first power connection structure 127.

[0106] When the press 122 is pressed, it is powered on, and when the press 122 is removed, it is powered off. Specifically, when the press 122 is matched with the processing platform 110, the first power connection structure 127 is connected to the second power connection structure 111, and the probe row 123 on the press 122 is powered on. When the press 122 is separated from the processing platform 110, the first power connection structure 127 is separated from the second power connection structure 111, and the probe row 123 on the press 122 is powered off.

[0107] It should be noted that the direction of movement of the pressing tool 122 can be vertical. Figure 7 When the press 122 is pressed down and the first power connection structure 127 is connected to the second power connection structure 111, the lifting platform 128 also drives the electrical connection member 121 to rise accordingly, so that the electrical connection member 121 extends into the opening 112 on the processing platform 110. When the press 122 is raised and the first power connection structure 127 is separated from the second power connection structure 111, the lifting platform 128 also drives the electrical connection member 121 to descend accordingly, so that the electrical connection member 121 exits the opening 112.

[0108] Optionally, the mounting assembly 126 includes two mounting side frames 1261 arranged opposite to each other, and the two ends of each probe row 123 are respectively fixedly connected to the two mounting side frames 1261. A plurality of first power connection structures 127 are arranged on a side of each mounting side frame 1261 away from the probe row 123, and a plurality of second power connection structures 111 are arranged on both sides of the processing platform 110. The two mounting side frames 1261 are used to assemble a plurality of probe rows 123, and the light shielding area of ​​the mounting assembly 126 is reduced, which is beneficial for the processing of the light source assembly 130.

[0109] Optionally, the first electrical connection structure 127 is a conductive protrusion, which may be a conductive protrusion or a conductive bump. The second electrical connection structure 111 is a conductive probe.

[0110] In some embodiments, reference Figure 7 and Figure 8The light source assembly 130 includes a plurality of laser light sources 131 and a plurality of infrared light sources 132. The laser light sources 131 are configured to perform laser-induced sintering on the solar cells 220 on the processing platform 110, and the infrared light sources 132 are configured to weld the first series segment 211 on the processing platform 110 and the first electrodes 221 on the plurality of solar cells 220.

[0111] When the infrared light source 132 is turned on, a thermal field is formed so that the first series segment 211 is alloyed with the first electrode 221 under the action of the thermal field, thereby achieving welding. When the series conductive member 210 also includes a second series segment 212, the second series segment 212 is alloyed with the second electrode 222 under the action of the thermal field, thereby achieving welding. Furthermore, the thermal field formed by the infrared light source 132 can also appropriately increase the temperature of the solar cell 220 to further enhance the laser induced sintering effect. When the laser light source 131 is turned on, the first electrode 221 is irradiated with laser to achieve laser induced sintering. When the solar cell 220 also has a second electrode 222, the second electrode 222 is irradiated with laser to achieve laser induced sintering. After laser induced sintering, the first electrode 221 and the second electrode 222 form contacts that improve ohmic contact.

[0112] As another example, the light source assembly 130 may also use a laser light source to weld the first series segment 211 on the processing platform 110 and the first electrodes 221 on the plurality of solar cells 220. Furthermore, the light source assembly 130 may also use a laser light source to weld the second series segment 212 on the processing platform 110 and the second electrodes 222 on the plurality of solar cells 220.

[0113] Optionally, refer to Figure 7 The light source assembly 130 further includes a light box 133, in which the laser light source 131 and the infrared light source 132 are both disposed. The light box 133 is used to shield the light emitted by the laser light source 131 and the infrared light source 132, and to confine the light emitted by the laser light source 131 and the infrared light source 132 to the processing platform 110, thereby reducing the influence of the laser and infrared light on the outside world.

[0114] Preferably, refer to Figure 7 The laser light source 131 is a laser lamp tube. Preferably, the infrared light source 132 is an infrared lamp tube. The light emitted by the strip-shaped laser light tube and the infrared light tube can easily cover the surface of the solar cell 220, which is beneficial to improving the welding effect and the laser induced sintering effect.

[0115] Optionally, refer to Fig.10 The processing platform 110 is a conveyor belt. In the conveying direction of the conveyor belt, the conveying direction of the conveyor belt is as follows: Fig.10In the direction X shown, the laser light source 131 and the infrared light source 132 are alternately arranged, thereby forming a relatively uniform heat field and laser irradiation area, which is conducive to the welding and laser induced sintering of the solar cell 220. After a solar cell 220 is welded and laser induced sintered, the conveyor belt can be transported forward a certain distance so that the light source assembly 130 can weld and laser induced sinter the next solar cell 220.

[0116] Optionally, the light source assembly 130 is located above the processing platform 110, and the laser light source 131 and the infrared light source 132 are staggered in the vertical direction so that the laser light source 131 and the infrared light source 132 can dissipate heat in a staggered manner. It should be noted that when the solar cell 220 is a back-contact solar cell, the infrared light emitted by the infrared light source 132 needs to penetrate the back-contact solar cell to reach the back of the back-contact solar cell for heating, which may cause the energy of the infrared light to be weakened. A heating element can be set on the processing platform 110 to assist the infrared light source 132 in heating and improve the welding effect.

[0117] Second, refer to Figure 2 and Figure 3 The embodiment of the present application discloses a method for processing a solar cell string, using the processing device 100 as described in the first aspect, and the processing method includes the following steps:

[0118] Unloading: placing the solar cells 220 and the series-connected conductive members 210 on the processing platform 110; wherein each series-connected conductive member 210 includes a plurality of first series-connected segments 211, and each first series-connected segment 211 is pressed between the processing platform 110 and each first electrode 221;

[0119] Loading reverse bias voltage: the electrical connector 121 contacts the first series segment 211 and is electrically connected to the solar cell 220 through the first electrode 221 , and the external power source 300 loads reverse bias voltage to each solar cell 220 through the electrical connector 121 ;

[0120] Laser induced sintering and series welding: the light source assembly 130 performs laser induced sintering on the solar cells 220 , and welds the first series segment 211 and the first electrodes 221 on the plurality of solar cells 220 .

[0121] This processing method superimposes laser induced sintering during the string welding process, which can not only reduce the power loss caused by string welding through laser induced sintering, but also eliminate the need to use additional laser induced sintering equipment to perform laser induced sintering separately before or after string welding, thereby improving processing efficiency.

[0122] In some embodiments, reference back Figures 5 to 8The solar cell 220 further includes a second electrode 222 disposed opposite to the first electrode 221 ; the series conductive element 210 further includes a second series segment 212 connected to the first series segment 211 .

[0123] The step of discharging the material also includes:

[0124] The second electrode 222 is located at a side of the solar cell 220 away from the processing platform 110 , and the second series segment 212 is placed at a side of the solar cell 220 away from the processing platform 110 .

[0125] The step of loading a reverse bias voltage also includes:

[0126] The probe row 123 of the press 122 is used to press the second series segments 212 onto the second electrodes 222 . The probe row 123 is electrically connected to the solar cells 220 through the second electrodes 222 . The external power supply 300 applies a reverse bias voltage to the solar cells 220 through the probe row 123 .

[0127] The steps of laser induced sintering and string welding also include:

[0128] The light source assembly 130 welds the second series segment 212 and the second electrode 222 .

[0129] Preferably, the light source assembly includes a laser light source and an infrared light source. The frequency of the laser emitted by the laser light source is 100kHz to 500kHz, including any value within the frequency range, such as 100kHz, 300kHz or 500kHz. The scanning speed is 5m / s to 15m / s, including any value within the speed range, such as 5m / s, 10m / s or 15m / s. The peak energy is 5J / cm 2 ~15J / cm 2 Include any value within this energy range, for example 5 J / cm 2 , 10J / cm 2 or 15J / cm 2 The duration of laser induced sintering is 1s to 3s, including any value within the time range, such as 1s, 2s or 3s. The wavelength of the infrared light emitted by the infrared light source is 0.76μm to 1.6μm, including any value within the wavelength range, such as 0.76μm, 1.0μm or 1.6μm, the power is 1kW to 2kW, including any value within the power range, such as 1kW 1.5kW or 2kW, and the welding time is 0.5s to 1s, including any value within the time range, such as 0.5s, 0.7s or 1s.

[0130] Optionally, the first electrode includes a first main grid, the first series segment is placed along the length direction of the first main grid, so that the contact area between the first series segment and the first main grid is larger, and the width of the first series segment is greater than or equal to the width of the first main grid, so that the laser can avoid the first series segment and irradiate on the first main grid, or act on the first main grid by reflection. It is understandable that the first electrode may also include a first sub-grid, and the laser induced sintering also occurs on the first sub-grid.

[0131] Optionally, the second electrode includes a second main grid, and the second series segment is placed along the length direction of the second main grid, so that the contact area between the second series segment and the second main grid is larger, and the width of the second series segment is greater than or equal to the width of the second main grid, so that the laser can avoid the second series segment and irradiate on the second main grid, or act on the second main grid by reflection. It is understandable that the second electrode can also include a second auxiliary grid, and the laser induced sintering also occurs on the second auxiliary grid.

[0132] It should be noted that the solar cell may also be a main grid-less solar cell. Then the first electrode includes a first fine grid. The first series segment contacts the first fine grid. The second electrode includes a second fine grid, and the second series segment contacts the second fine grid.

[0133] Thirdly, refer to Fig.11 and Fig.12 The embodiment of the present application discloses a solar cell string 200, which is processed by the processing equipment as described in the first aspect, or the solar cell string 200 is processed by the processing method as described in the second aspect.

[0134] The solar cell string 200 includes a plurality of solar cells 220 and a plurality of series conductive members 210 . The first series segment 211 is welded to the first electrode 221 of the solar cell 220 . The series conductive member 210 is configured to connect the plurality of solar cells 220 in series.

[0135] For example, Fig.11 As shown, the solar cell 220 is a back-contact solar cell, and the first electrode 221 includes a positive grid line and a negative grid line. The series conductive member 210 includes two connected first series segments 211. One of the first series segments 211 of the series conductive member 210 is connected to the positive grid line of a back-contact solar cell, and the other first series segment 211 is connected to the negative grid line of another back-contact solar cell, thereby realizing the series connection of two back-contact solar cells.

[0136] In some embodiments, Fig.12As shown, each solar cell 220 also has a second electrode 222 arranged opposite to the first electrode 221, and the series conductive element 210 also includes a second series segment 212 connected to the first series segment 211. The first series segment 211 of each series conductive element 210 is welded to the first electrode 221 of one of the solar cells 220, and the second series segment 212 is welded to the second electrode 222 of another solar cell 220.

[0137] Optionally, the first electrode 221 and the second electrode 222 are both silver electrodes. During laser induced sintering, the local high current and high temperature cause the silver in the silver electrode to quickly diffuse and alloy with the silicon in the solar cell 220 to form a silver-silicon-aluminum alloy, thereby reducing the electrode contact resistance.

[0138] In a fourth aspect, an embodiment of the present application discloses a photovoltaic module, comprising a solar cell string as in the third aspect.

[0139] 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 equipment, characterized in that: The processing equipment includes: A processing platform, wherein the processing platform is configured to place a plurality of series-connected conductive members and a plurality of the solar cells; wherein each of the solar cells has a first electrode on a surface facing the processing platform, and each of the series-connected conductive members includes a plurality of first series-connected segments, wherein the first series-connected segments are pressed between the processing platform and the first electrode; a voltage loading mechanism, comprising a plurality of electrical connectors, wherein the electrical connectors are configured to contact the first series segment and electrically connect the solar cell through the first electrode; and A light source assembly is configured to perform laser induced sintering on the solar cells and to weld a plurality of the first series segments to the first electrodes on a plurality of the solar cells.

2. The processing equipment according to claim 1, characterized in that: The voltage loading mechanism further includes a press, the press includes a plurality of probe rows, the solar cell has a second electrode on a side away from the processing platform, each of the series conductive members also includes a second series segment connected to the first series segment, the second series segment is placed on a side of the solar cell away from the processing platform, and the probe row is configured to press a plurality of the second series segments onto a plurality of the second electrodes, so as to electrically connect each of the solar cells through each of the second electrodes; The light source assembly is also configured to weld a plurality of the second series segments on the processing platform and a plurality of second electrodes on the solar cells.

3. The processing equipment according to claim 2, characterized in that: The probe row comprises: A bracket, wherein the bracket is provided with a plurality of through holes arranged at intervals; a plurality of first springs, each of which is disposed in each of the through holes; and A plurality of conductive probes, each of which is respectively inserted into each of the through holes and penetrates each of the first springs, one end of the first spring is fixed in the through hole and the other end is connected to the conductive probe, the conductive probe has a first end and a second end which are arranged opposite to each other, each of the first springs is configured to drive each of the first ends to protrude out of each of the through holes and press each of the second series segments, each of the second ends is provided with a limiting structure, and each of the limiting structures is configured to limit each of the second ends on the bracket.

4. The processing equipment according to claim 2, characterized in that: The press is movably arranged between the light source assembly and the processing platform; the number of the probe rows is multiple, and the multiple probe rows are arranged at intervals, and a light-transmitting gap is enclosed between two adjacent probe rows, and the light-transmitting gap is configured to transmit the light emitted by the light source assembly to the processing platform; A plurality of connection structures are provided between adjacent probe rows. The connection structures cross the light-transmitting gaps and two ends of the connection structures are respectively fixedly connected to two probe rows.

5. The processing equipment according to claim 2, characterized in that: The press also includes a mounting assembly, each of the probe rows is arranged on the mounting assembly, a first power connection structure is arranged on the mounting assembly, each of the probe rows is electrically connected to the first power connection structure, a second power connection structure is arranged on the processing platform, the second power connection structure and the electrical connector are configured to be electrically connected to the positive and negative poles of an external power supply respectively, and the second power connection structure is also configured to dock with the first power connection structure.

6. The processing equipment according to claim 5, characterized in that The mounting assembly comprises two mounting side frames arranged opposite to each other, and two ends of each probe row are respectively fixedly connected to the two mounting side frames; a plurality of the first power connection structures are arranged on a side of each mounting side frame away from the probe row, and a plurality of the second power connection structures are arranged on both sides of the processing platform; And / or, the first power connection structure is a conductive protrusion, and the second power connection structure is a conductive probe.

7. The processing equipment according to claim 1, characterized in that: The light source assembly includes a plurality of laser light sources and a plurality of infrared light sources. The laser light sources are configured to perform laser-induced sintering on the solar cells on the processing platform. The infrared light sources are configured to weld the first series segment on the processing platform and the first electrodes on the plurality of solar cells.

8. The processing equipment according to claim 7, characterized in that: The processing platform is a conveyor belt, and in the conveying direction of the conveyor belt, the laser light source and the infrared light source are alternately arranged; And / or, the light source assembly is located above the processing platform, and the laser light source and the infrared light source are staggered in the vertical direction; And / or, the light source assembly further comprises a light box, and the laser light source and the infrared light source are both arranged in the light box; And / or, the laser light source is a laser lamp tube; And / or, the infrared light source is an infrared lamp tube.

9. The processing equipment according to any one of claims 1 to 8, characterized in that: The processing platform has a placement surface, which is configured to place a plurality of the series conductive members and a plurality of the solar cells. The electrical connector is arranged corresponding to the placement surface, and is configured to contact a side of the first series segment facing the placement surface.

10. The processing equipment according to claim 9, characterized in that The processing platform is a conveyor belt, and the conveyor belt is provided with a plurality of rows of openings, each row of the openings includes a plurality of the openings, and the plurality of rows of the openings are arranged at intervals along the rotation direction of the conveyor belt; The plurality of electrical connectors are configured to be disposed corresponding to one row of the openings when the conveyor belt is stationary, and the plurality of electrical connectors extend into the plurality of openings and are exposed on the placement surface to contact the first series segment.

11. The processing equipment according to claim 10, characterized in that The voltage loading mechanism also includes a lifting platform, the placement surface is the top surface of the conveyor belt, the electrical connectors are correspondingly arranged on the lower side of the placement surface, each of the electrical connectors is driven and connected to the lifting platform, and the lifting platform is configured to drive a number of the electrical connectors to lift and retract relative to the opening on the placement surface.

12. The processing equipment according to claim 11, characterized in that The voltage loading mechanism further includes a plurality of second springs, a socket is provided on the lifting platform, each of the second springs is arranged on the lifting platform and corresponds to each of the sockets, each of the electrical connectors is inserted into each of the second springs, and the bottom end of the electrical connector is inserted into each of the sockets, the two ends of the second springs respectively abut against the top surface of the lifting platform and the electrical connector, and each of the second springs is configured to lift each of the electrical connectors upward; The lifting platform is also provided with a plurality of anti-collision grooves, each of which is located below each of the sockets and is connected to each of the sockets, and the bottom end of the electrical connector is movably arranged in the anti-collision groove.

13. A method for processing a solar cell string, characterized in that: Using the processing equipment as described in any one of claims 1 to 12, the processing method comprises the following steps: Unloading: placing the solar cell and the series conductive member on the processing platform; wherein each of the series conductive members comprises a plurality of first series segments, and each of the first series segments is pressed between the processing platform and each of the first electrodes; Loading a reverse bias voltage: the electrical connector contacts the first series segment and is electrically connected to the solar cell through the first electrode, and an external power source loads a reverse bias voltage to each of the solar cells through the electrical connector; Laser induced sintering and series welding: the light source assembly performs laser induced sintering on the solar cells, and welds the first series segment and the first electrodes on a plurality of the solar cells.

14. The processing method according to claim 13, characterized in that: The solar cell also has a second electrode disposed opposite to the first electrode; the series conductive member also includes a second series segment connected to the first series segment; The step of discharging the material also includes: The second electrode is located at a side of the solar cell away from the processing platform, and the second series segment is placed at a side of the solar cell away from the processing platform; The step of loading the reverse bias voltage also includes: Using a probe row of a press to press a plurality of the second series segments onto a plurality of the second electrodes, the probe row is electrically connected to each of the solar cells through each of the second electrodes, and the external power source applies a reverse bias voltage to each of the solar cells through the probe row; The laser induced sintering and string welding steps further include: The light source assembly welds the second series segment and the second electrode.

15. The processing method according to claim 13 or 14, characterized in that: The light source assembly includes a laser light source and an infrared light source. The laser light source emits a laser with a frequency of 100kHz to 500kHz, a scanning speed of 5m / s to 15m / s, and a peak energy of 5J / cm 2 ~15J / cm 2 , the duration of laser induced sintering is 1s to 3s; the wavelength range of the infrared light emitted by the infrared light source is 0.76μm to 1.6μm, the power is 1kW to 2kW, and the welding time is 0.5s to 1s; And / or, the first electrode includes a first main grid, the first series segment is placed along the length direction of the first main grid, and the width of the first series segment is greater than or equal to the width of the first main grid; And / or, the second electrode includes a second main grid, the second series segment is placed along the length direction of the second main grid, and the width of the second series segment is greater than or equal to the width of the second main grid.

16. A solar cell string, characterized in that: The solar cell string is obtained by processing the processing equipment as described in any one of claims 1 to 12, or the solar cell string is obtained by processing the processing method as described in any one of claims 13 to 15; The solar cell string includes a plurality of solar cells and a plurality of series conductive members, the first series segment is welded to the first electrode of the solar cell, and the series conductive member is configured to connect the plurality of solar cells in series.

17. The solar cell string according to claim 16, characterized in that: Each of the solar cells also has a second electrode arranged opposite to the first electrode, and the series conductive member also includes a second series segment connected to the first series segment, and the first series segment of each of the series conductive members is welded to the first electrode of one of the solar cells and the second series segment is welded to the second electrode of another solar cell.

18. A photovoltaic module, characterized in that: Comprising the solar cell string as claimed in claim 16 or 17.

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