Welding pressing tool and laser processing system

Abstract

The utility model relates to the technical field of solar cell welding hold-down tools, in particular to a welding hold-down tool and a laser processing system, the welding hold-down tool is used for pressing a back contact solar cell and a welding strip, the back contact solar cell is provided with a back surface, the back surface is provided with a plurality of to-be-welded parts, and the to-be-welded parts are opposite to the welding strip. The welding pressing tool comprises a pressing face, a limiting groove is formed in the pressing face, and the limiting groove is configured to be matched with the welding strip in shape so as to limit the position of the welding strip in the limiting groove; a plurality of convex parts are arranged in the limiting groove, and the convex parts and the area, opposite to the convex parts, of the welding hold-down tool are light-transmitting in the thickness direction of the welding hold-down tool; when the back contact solar cell and the welding strip are pressed by the welding pressing tool, each convex part is configured to be arranged corresponding to each to-be-welded part, and the convex parts are used for abutting against the welding strip, so that the welding strip part protrudes relative to the pressing surface to be in contact with the to-be-welded parts, and the problem that the to-be-welded parts located in the avoiding grooves are difficult to contact with the welding strip is solved. And the limiting groove plays a better role in limiting the welding strip.

Description

Technical Field

[0001] This application relates to the technical field of solar cell fixtures, and particularly to a welding fixture and a laser processing system. Background Art

[0002] To avoid leakage due to contact between the positive and negative electrodes, an insulating layer is provided on the back surface of the back-contact solar cell, and the welding portions of the positive and negative electrodes are exposed through the avoidance grooves on the insulating layer for welding. However, the welding portions are located in the avoidance grooves, and it is difficult for the welding tape to directly contact the welding portions during welding, and the welding tape is prone to displacement during welding, affecting the welding. Utility Model Content

[0003] Embodiments of this application disclose a welding fixture and a laser processing system, which can solve the problem that it is difficult for the welding portions located in the avoidance grooves to contact the welding tape.

[0004] To achieve the above object, in a first aspect, embodiments of this application disclose a welding fixture. The welding fixture is used to press-fit a back-contact solar cell and a welding tape. The back-contact solar cell has a back surface, and there are several welding portions on the back surface. The welding portions are opposite to the welding tape.

[0005] The welding fixture includes a pressing surface, and a limiting groove is provided on the pressing surface. The limiting groove is configured to match the shape of the welding tape to limit the position of the welding tape in the limiting groove. Several convex portions are provided in the limiting groove. In the thickness direction of the welding fixture, the convex portions and the area of the welding fixture opposite to the convex portions are light-transmissive. When the welding fixture presses the back-contact solar cell and the welding tape, the convex portions are configured to be respectively arranged corresponding to the welding portions. The convex portions are used to abut against the welding tape, so that a part of the welding tape protrudes relative to the pressing surface to contact the welding portions.

[0006] In a possible implementation manner of the first aspect, in the depth direction of the limiting groove, the convex portions protrude from one end of the limiting groove away from the pressing surface. The height of the convex portions is less than the depth of the limiting groove, and the sum of the height of the convex portions and the thickness of the welding tape is greater than the depth of the limiting groove.

[0007] In a possible implementation manner of the first aspect, one end of the convex portion close to the pressing surface is arc-shaped.

[0008] In a possible implementation manner of the first aspect, the convex portions are hemispherical;

[0009] And / or, the height of the convex portions is 0.1 mm to 0.5 mm.

[0010] In a possible implementation of the first aspect, the material of the welding fixture is an insulating and light-transmitting material.

[0011] In a possible implementation of the first aspect, the refractive index of the material of the welding fixture is less than 1.5%, the reflectivity of the material of the welding fixture is less than 3%, and the light transmittance of the material of the welding fixture is greater than 90%;

[0012] And / or, the melting point of the material of the welding fixture is greater than 300 °C;

[0013] And / or, the material of the welding fixture is glass.

[0014] In a possible implementation of the first aspect, the welding fixture and the convex portion are of an integral structure;

[0015] And / or, the welding fixture is of a plate-like structure;

[0016] And / or, the thickness of the welding fixture is 3 mm to 4 mm.

[0017] In a possible implementation of the first aspect, the limiting groove is strip-shaped, and in the length direction of the limiting groove, both ends of the limiting groove penetrate through the welding fixture; a plurality of the convex portions are arranged at intervals along the length direction of the limiting groove;

[0018] And / or, the depth of the limiting groove is 0.1 mm to 0.5 mm, and the width of the limiting groove is 0.2 mm to 2.0 mm.

[0019] In a second aspect, an embodiment of the present application discloses a laser processing system, including:

[0020] A plurality of welding fixtures as described in the first aspect; and

[0021] A laser, the laser being configured to weld the part to be welded and the welding ribbon through the welding fixture.

[0022] In a possible implementation of the second aspect, the laser processing system further includes:

[0023] A voltage application device, a part of the welding ribbon extends relative to the welding fixture, and the voltage application device is configured to contact the extended part of the welding ribbon and apply a bias voltage to the back contact solar cell through the welding ribbon;

[0024] The laser is further configured to perform laser-induced sintering on the back contact solar cell through the welding fixture.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: When the welding jig is used for pressing the back-contact solar cell and the welding tape during the welding of the back-contact solar cell, the pressing surface faces the back surface of the back-contact solar cell. Since the shape of the limiting groove matches that of the welding tape, the welding tape is limited in position within the limiting groove, so that the limiting groove plays a good role in limiting the welding tape, preventing the welding tape from shifting during the welding process, enabling the welding tape to better correspond to the parts to be welded, and thus facilitating the welding. In addition, a number of convex portions are provided in the limiting groove, and each convex portion is correspondingly arranged with each part to be welded, and the convex portion abuts against the welding tape. Therefore, due to the abutting action of the convex portion, the welding tape protrudes relative to the pressing surface to contact the parts to be welded, thus solving the problem that it is difficult for the parts to be welded located in the avoidance groove to contact the welding tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of a welding jig disclosed in an embodiment of the present application;

[0028] Figure 2 is Figure 1 Cross-sectional view of the A-A section shown in;

[0029] Figure 3 Schematic diagram of the welding jig pressing the back-contact solar cell and the welding tape disclosed in an embodiment of the present application;

[0030] Figure 4 is Figure 3 Cross-sectional view of the B-B section shown in;

[0031] Figure 5 Structural schematic diagram of a laser processing system disclosed in an embodiment of the present application.

[0032] Description of the reference numerals:

[0033] 100, laser processing system; 110, welding jig; 111, pressing surface; 112, limiting groove; 113, convex portion; 120, laser; 130, voltage application device; 131, probe; 200, back-contact solar cell; 201, back surface; 202, part to be welded; 203, insulating layer; 204, avoidance groove; 300, welding tape. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0035] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0036] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances.

[0037] In addition, the terms "arranged", "provided with", "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 directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] 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, the meaning of "a plurality" is two or more.

[0039] The positive and negative electrodes of the back-contact solar cell are both distributed on its back, and there is no electrode shielding on the front. However, since both the positive and negative electrodes are on the back, in order to avoid leakage caused by the connection of the positive and negative electrodes, an insulating layer for separating the positive and negative electrodes, such as an insulating glue layer, can be provided on the back. The parts to be welded on the positive and negative electrodes are exposed through the avoidance grooves on the insulating glue layer. Since the insulating glue layer has a certain thickness, and the surface of the part to be welded is lower than the surface of the insulating glue layer, when the part to be welded is welded, the welding tape cannot directly contact the part to be welded. The welding press net can press down the back-contact solar cell and the welding tape during welding, so that the welding tape corresponds to the part to be welded in position.

[0040] However, the welding mesh in the related art cannot be used for laser welding of back-contact solar cells because the above-mentioned welding mesh is made of metal and blocks the laser beam. Secondly, the above-mentioned welding mesh cannot make the welding tape contact the part to be welded, and the limiting effect on the welding tape is also weak, and the welding tape shifts during the welding process.

[0041] Based on the above analysis, the embodiment of the present application provides a welding fixture. When welding the back-contact solar cell, the welding fixture presses the back-contact solar cell and the welding tape, and plays a good limiting role on the welding tape through the limiting groove. The welding fixture also abuts against the welding tape through the convex part, so that the part of the welding tape protrudes relative to the pressing surface and contacts the part to be welded, thereby solving the problem that it is difficult for the part to be welded located in the avoidance groove to contact the welding tape, and further enabling the laser to pass through the convex part to weld the part to be welded and the welding tape, realizing the laser welding of the back-contact solar cell.

[0042] Next, the technical solutions of the present invention will be described in conjunction with embodiments and drawings.

[0043] In the first aspect, referring to Figures 1 to 4 , the embodiment of the present application discloses a welding fixture 110. The welding fixture 110 is used to press the back-contact solar cell 200 and the welding tape 300. The back-contact solar cell 200 has a back surface 201, and a plurality of parts to be welded 202 are provided on the back surface 201. The parts to be welded 202 are opposite to the welding tape 300. More specifically, an insulating layer 203 is provided on the back surface 201, and an avoidance groove 204 is provided on the insulating layer 203. The parts to be welded 202 are exposed through the avoidance groove 204.

[0044] The welding fixture 110 includes a pressing surface 111. A limiting groove 112 is provided on the pressing surface 111. The limiting groove 112 is configured to match the shape of the welding tape 300 to limit the position of the welding tape 300 in the limiting groove 112. A plurality of convex parts 113 are provided in the limiting groove 112. In the thickness direction of the welding fixture 110, the convex parts 113 and the area of the welding fixture 110 opposite to the convex parts 113 are light-transmissive. When the welding fixture 110 presses the back-contact solar cell 200 and the welding tape 300, each convex part 113 is configured to be correspondingly arranged with each part to be welded 202, and the convex part 113 is used to abut against the welding tape 300 so that the part of the welding tape 300 protrudes relative to the pressing surface 111 and contacts the part to be welded 202.

[0045] It should be noted that for the back-contact solar cell 200 with main grids, the term "part to be welded 202" refers to the pads (Pad points) on the main grids. For the back-contact solar cell 200 without main grids, the term "part to be welded 202" refers to the solder joints on the fine grids. In other words, the welding jig 110 is applicable to both the back-contact solar cell 200 with main grids and the back-contact solar cell 200 without main grids. Regarding the pressing method, the welding jig 110 can press the back-contact solar cell 200 and the solder tape 300 by its own gravity, or an external force can be applied to the welding jig 110 to make the welding jig 110 press the back-contact solar cell 200 and the solder tape 300. Regarding the pressing surface 111, the pressing surface 111 is the side opposite to the back surface 201 of the back-contact solar cell 200 when the welding jig 110 presses. In other words, the solder tape 300 is pressed between the pressing surface 111 and the back surface 201 of the back-contact solar cell 200.

[0046] The welding jig 110 can be used to press the back-contact solar cell 200 and the solder tape 300 during the welding of the back-contact solar cell 200. At this time, the pressing surface 111 is opposite to the back surface 201 of the back-contact solar cell 200. Since the limiting groove 112 matches the shape of the solder tape 300, the solder tape 300 is limited to the position within the limiting groove 112. Thus, the limiting groove 112 plays a good limiting role on the solder tape 300, preventing the solder tape 300 from shifting during the welding process, enabling the solder tape 300 to better correspond to the part to be welded 202, and further facilitating the welding. In addition, several convex parts 113 are provided in the limiting groove 112, and each convex part 113 is correspondingly arranged with each part to be welded 202. The convex part 113 abuts against the solder tape 300, so that due to the abutting action of the convex part 113, the solder tape 300 protrudes relative to the pressing surface 111 to contact the part to be welded 202, thus solving the problem that the part to be welded 202 located in the avoidance groove 204 is difficult to contact the solder tape 300. The laser passes through the area of the welding jig 110 opposite to the convex part 113 and acts on the solder tape 300, and then laser processing is implemented.

[0047] Preferably, referring to Figure 2 , the welding jig 110 has a plate-like structure and can better press the sheet-shaped back-contact solar cell 200.

[0048] Preferably, the thickness of the welding jig 110 is 3 mm to 4 mm, including any value within this thickness range, such as 3 mm, 3.5 mm, or 4 mm. By controlling the thickness of the welding jig 110, the weight of the welding jig 110 can be controlled, thereby controlling the pressure of the welding jig 110 to apply different forces to different solder tapes 300. The welding jig 110 with this thickness can provide an appropriate downward pressure on the solder tape 300 and the back-contact solar cell 200, and the loss of the laser passing through the welding jig 110 with this thickness is less.

[0049] In some embodiments, the material of the welding jig 110 is an insulating and light-transmitting material. Exemplarily, the insulating and light-transmitting material can be glass or a transparent polymer material, and more preferably non-tempered ultra-white glass.

[0050] The light-transmitting welding jig 110 enables the laser emitted by the laser 120 to pass through the welding jig 110 and perform laser-induced sintering on the back surface 201 of the back-contact solar cell 200.

[0051] The insulating welding jig 110 enables the voltage application device 130 to apply a bias voltage to the back-contact solar cell 200 through the solder tape 300 without causing a short circuit.

[0052] It can be seen that by using the insulating and light-transmitting welding jig 110, laser welding and laser-induced sintering can be performed using the same laser, thereby improving equipment utilization rate, reducing equipment costs, and simplifying the processing process.

[0053] Furthermore, the refractive index of the material of the welding jig 110 is less than 1.5%, the reflectivity of the material of the welding jig 110 is less than 3%, and the light transmittance of the material of the welding jig 110 is greater than 90%. The light transmittance can reflect the degree of laser transmission through the material. The smaller the refractive index and the lower the reflectivity, the better the laser transmittance of the welding jig 110. Generally speaking, the welding jig 110 made of the above material can reduce the loss of laser, and the laser still has sufficient energy to perform welding and laser-induced sintering after passing through the welding jig 110.

[0054] Preferably, the melting point of the material of the welding jig 110 is greater than 300 °C. When the melting point of the material is greater than 300 °C, the welding jig 110 made of this material can meet the requirements of laser processing and reduce the risk of the welding jig 110 being melted or burned by the high temperature caused by the laser.

[0055] Preferably, the material of the welding jig 110 is glass. The density of the glass is appropriate, and it can provide sufficient pressure for pressing after being made into the welding jig 110. Moreover, the glass has high light transmittance, strong laser resistance, and stable properties at high temperatures, meeting the requirements of laser processing.

[0056] In some embodiments, referring to Figure 2 , the welding jig 110 and the convex portion 113 are of an integral structure. Exemplarily, the welding jig 110 is manufactured by a numerically controlled lathe. In other words, the welding jig 110 and the convex portion 113 are of an integral structure, the structure is more stable, and to a certain extent, it can reduce the loss when the laser passes through the welding jig 110 and the convex portion 113.

[0057] In some embodiments, combining Figure 1 and Figure 4, the limiting groove 112 is strip-shaped. The strip-shaped limiting groove 112 can better limit the strip-shaped welding ribbon 300. In the length direction of the limiting groove 112, both ends of the limiting groove 112 penetrate through the welding press tool 110. During pressing, the welding ribbon 300 is arranged along the length direction of the limiting groove 112, and both ends of the welding ribbon 300 can extend out of the welding press tool 110 through the exposed ends of the limiting groove 112. The welding press tool 110 of the present application can press the back-contact solar cell 200 one by one, and the part of the welding ribbon 300 extending out of the welding press tool 110 can connect two back-contact solar cells 200 in series.

[0058] Optionally, as shown in Figures 1 to 3 , a plurality of convex portions 113 are arranged at intervals along the length direction of the limiting groove 112. During pressing, the plurality of convex portions 113 push out multiple positions of the welding ribbon from the limiting groove 112, so that multiple positions of the welding ribbon can respectively contact a plurality of parts to be welded.

[0059] Preferably, the depth of the limiting groove 112 is 0.1 mm to 0.5 mm, including any point value within this depth range, such as 0.1 mm, 0.3 mm or 0.5 mm. This depth range matches the thickness of the welding ribbon 300 in the related art, so that the welding ribbon 300 is fittingly limited in the limiting groove 112. The width of the limiting groove 112 is 0.2 mm to 2.0 mm, including any point value within this width range, such as 0.2 mm, 1.1 mm or 2.0 mm. This width range matches the width range of the welding ribbon 300 in the related art, so that the welding ribbon 300 is fittingly limited in the limiting groove 112.

[0060] In some embodiments, referring to Figure 3 , the depth direction of the limiting groove 112 is the Z0-Z1 direction as shown in Figure 3 . In the depth direction of the limiting groove 112, the convex portion 113 protrudes from one end of the limiting groove 112 away from the pressing surface 111. The height H of the convex portion 113 is less than the depth D of the limiting groove 112, and the sum of the height H of the convex portion 113 and the thickness T of the welding ribbon 300 is greater than the depth D of the limiting groove 112. In other words, when the convex portion 113 abuts against the welding ribbon 300, the part of the welding ribbon 300 in contact with the convex portion 113 protrudes relative to the pressing surface 111 to contact the part to be welded 202, and the remaining part of the welding ribbon 300 is still located in the limiting groove 112, thereby limiting the welding ribbon 300.

[0061] Further, as shown in Figure 3, one end of the convex portion 113 close to the pressing surface 111 is arc-shaped. Since a layered structure is provided on the surface of the solder tape 300, for example, a soft tin-lead plating layer. When the soft layered structure comes into contact with the convex portion 113, there is a risk of being knocked off or scraped off. The welding jig 110 of the present application just sets one end of the convex portion 113 close to the pressing surface 111 as an arc shape, and this arc-shaped end is used to contact the surface of the solder tape 300, thereby reducing the risk of damage to the above-mentioned layered structure.

[0062] Preferably, the convex portion 113 is hemispherical, and the entire surface of the convex portion 113 is an arc surface, which is more beneficial to protecting the solder tape 300. The transparent and hemispherical convex portion 113 can be designed as a convex lens capable of concentrating laser, and this convex lens plays a role in concentrating the laser beam, improving the utilization rate of laser energy.

[0063] Optionally, the height H of the convex portion 113 is 0.1 mm to 0.5 mm, including any point value within this height range, such as 0.1 mm, 0.3 mm or 0.5 mm. This height range matches the depth of the limiting groove 112 and the thickness of the solder tape 300, so that the solder tape 300 can protrude from the limiting groove 112 when contacting the convex portion 113.

[0064] In a second aspect, referring to Figure 5 , an embodiment of the present application discloses a laser processing system 100, including a plurality of welding jigs 110 as described in the first aspect and a laser 120. The laser 120 is configured to weld the part to be welded 202 and the solder tape 300 through the welding jig 110. Exemplarily, the laser 120 is located above the welding jig 110, and the welding jig 110 presses down the solder tape 300 and the back-contact solar cell 200.

[0065] Referring to Figure 5 , the laser processing system 100 further includes a voltage application device 130. A part of the solder tape 300 extends out relative to the welding jig 110, and the voltage application device 130 is configured to contact the extended part of the solder tape 300 and apply a bias voltage to the back-contact solar cell 200 through the solder tape 300.

[0066] The material of the welding jig 110 is an insulating and light-transmitting material to avoid short circuits caused by the voltage application device 130 applying a bias voltage to the back-contact solar cell 200. The laser 120 is further configured to perform laser-induced sintering on the back-contact solar cell 200 through the welding jig 110. Further, the welding jig 110 is configured to be the same size as or larger than the size of the back-contact solar cell 200, so that the welding jig 110 can cover the back-contact solar cell 200 when pressing.

[0067] Exemplarily, the voltage application device 130 includes a plurality of liftable probes 131. The plurality of probes 131 are located above the solder tape 300. When applying voltage, the plurality of probes 131 descend relative to the plurality of solder tapes 300 respectively to contact the solder tapes 300. When the probes 131 contact the solder tapes 300, an external power supply applies a bias voltage to the back-contact solar cell 200 through the probes 131 and the solder tapes 300. The laser processing system 100 cleverly utilizes the solder tapes 300 during string soldering to apply a bias voltage to the plurality of back-contact solar cells 200, enabling laser string soldering and laser-induced sintering to be carried out in the same laser processing system 100, simplifying the processing flow and reducing the equipment cost.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and 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 welding press, characterized in that: The welding press is used to press the back-contact solar cell and the welding strip, wherein the back-contact solar cell has a back side, and the back side has a plurality of to-be-welded portions, and the to-be-welded portions are opposite to the welding strip; The welding press comprises a pressing surface, on which a limiting groove is arranged, and the limiting groove is configured to match the shape of the welding strip so as to limit the position of the welding strip in the limiting groove; a plurality of protrusions are arranged in the limiting groove, and in the thickness direction of the welding press, the protrusions and the areas of the welding press opposite to the protrusions are light-transmissive; when the welding press presses the back-contact solar cell and the welding strip, each of the protrusions is configured to correspond to each of the parts to be welded, and the protrusions are used to abut against the welding strip so that the welding strip portion protrudes relative to the pressing surface and contacts the part to be welded.

2. The welding press according to claim 1, characterized in that: In the depth direction of the limiting groove, the protrusion protrudes from one end of the limiting groove away from the pressing surface, the height of the protrusion is less than the depth of the limiting groove, and the sum of the height of the protrusion and the thickness of the welding strip is greater than the depth of the limiting groove.

3. The welding press according to claim 2, characterized in that: One end of the convex portion close to the pressing surface is arc-shaped.

4. The welding press according to claim 3, characterized in that: One end of the convex portion close to the pressing surface is hemispherical; And / or, the height of the protrusion is 0.1 mm to 0.5 mm.

5. The welding press according to claim 1, characterized in that: The welding press is made of insulating and light-transmitting material.

6. The welding press according to claim 5, characterized in that: The refractive index of the material of the welding press is less than 1.5%, the reflectivity of the material of the welding press is less than 3%, and the light transmittance of the material of the welding press is greater than 90%; and / or, the melting point of the material of the welding press is greater than 300° C.; And / or, the welding press is made of glass.

7. The welding press according to any one of claims 1 to 6, characterized in that The welding press and the convex portion are an integral structure; And / or, the welding press is a plate-like structure; And / or, the thickness of the welding press is 3 mm to 4 mm.

8. The welding press according to any one of claims 1 to 6, characterized in that The limiting groove is strip-shaped, and in the length direction of the limiting groove, both ends of the limiting groove pass through the welding press; a plurality of the convex portions are arranged at intervals along the length direction of the limiting groove; And / or, the depth of the limiting groove is 0.1 mm to 0.5 mm, and the width of the limiting groove is 0.2 mm to 2.0 mm.

9. A laser processing system, characterized in that: include: A number of welding presses as claimed in any one of claims 1 to 8; as well as A laser is configured to weld the portion to be welded and the welding strip through the welding jig.

10. The laser processing system according to claim 9, characterized in that: The laser processing system also includes: a voltage applying device, a portion of the soldering ribbon protruding relative to the soldering press, the voltage applying device being configured to contact the protruding portion relative to the soldering ribbon to apply a bias voltage to the back-contact solar cell through the soldering ribbon; The laser is also configured to perform laser induced sintering of the back contact solar cell through the welding press.

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