Solar cell cutting device

Abstract

The utility model relates to the technical field of solar cell equipment, and discloses a solar cell cutting device, which comprises a slotting mechanism, a cutting mechanism, a cutting mechanism and a cutting mechanism, the slotting mechanism is used for slotting a cutting line of a solar cell, so that a cutting groove is formed at the cutting line of the solar cell; the slicing mechanism comprises a plurality of cutting structures, a containing position is formed between every two adjacent cutting structures, the cutting structures are configured to cut the solar cells along the positions of the cutting grooves, and the containing positions are configured to contain the cut solar cells. When the cutting device of the solar cell is used for cutting the solar cell, the phenomena of edge breakage, fragment and the like of the solar cell can be reduced to a large extent, and the yield of the cut solar cell is improved.

Description

Technical Field

[0001] This utility model relates to the field of solar cell equipment technology, and in particular to a solar cell cutting device. Background Technology

[0002] In the solar cell cutting process, the solar cells are first cut, and then clamping tools are used to transfer the cut solar cells to achieve the purpose of slicing. However, there are many problems in this process, which can easily lead to edge chipping or breakage of the cut solar cells, resulting in a decrease in the yield of the cut solar cells. Utility Model Content

[0003] This utility model discloses a solar cell cutting device. When cutting solar cells, the solar cell cutting device of this application can greatly reduce the phenomena such as edge chipping and fragmentation of solar cells, and improve the yield of the cut solar cells.

[0004] This application provides a cutting device for solar cells, the cutting device comprising:

[0005] A grooving mechanism is used to groove the cutting line of a solar cell so that a cutting groove is formed at the cutting line of the solar cell.

[0006] The slicing mechanism includes multiple cutting structures, with receiving positions formed between adjacent cutting structures. The cutting structures are configured to cut the solar cells along the cutting grooves, and the receiving positions are configured to place the cut solar cells.

[0007] Furthermore, the cutting structure includes:

[0008] Main structural element;

[0009] A cutting section is located at the edge of the main body of the structure along its own length direction. The cutting section is used to abut against the cutting groove of the solar cell to cut the solar cell along the position of the cutting groove.

[0010] A guide ramp is located below the cutting section and is used to guide the cut solar cell into the receiving position.

[0011] Furthermore, the angle between the bottom surface of the main structure and the guide slope is 40° to 50°; and / or,

[0012] The cut portion is a sharp corner or an outwardly protruding arc-shaped top; and / or

[0013] In the width direction perpendicular to the length of the main structure, the width of the cut portion is less than or equal to the width of the cut groove.

[0014] Furthermore, the cross-section of the cutting structure perpendicular to the length direction of the main body of the structure is triangular, the cutting part is located at the apex of the triangle, and the guide slope is located on the hypotenuse of the triangle.

[0015] Furthermore, the material of the cutting structure includes homopolymer polypropylene.

[0016] Furthermore, the cutting device further includes a sorting mechanism, which comprises:

[0017] A test piece, used to detect the quality of the solar cell after it has been cut;

[0018] A sorting container is used to hold the solar cells after they have been tested by the test piece.

[0019] Furthermore, the slicing mechanism also includes a conveying component, and the cutting structure is disposed on the conveying component. Along the conveying direction of the conveying component, the slicing mechanism includes a cutting position, a dropping position, and a detection position located between the cutting position and the dropping position.

[0020] The cutting position is configured to cut the slotted position of the solar cell, the position of the test piece corresponds to the detection position of the slicing mechanism, the sorting container is configured to move along the transport direction of the conveyor, and the drop position is configured to allow the cut solar cell to fall into the sorting container.

[0021] Furthermore, the sorting container is located below the drop position; and / or,

[0022] The sorting container has multiple sorting positions for accommodating different types of solar cells; wherein, the multiple sorting positions are used to place solar cells of different electrical performance levels respectively; and / or,

[0023] The multiple sorting locations are used to respectively place good and bad solar cells; and / or,

[0024] Multiple sorting locations are used to place solar cells of different thicknesses respectively; and / or,

[0025] The sorting locations are used to place the solar cells with different damaged locations.

[0026] Furthermore, the grooving mechanism includes a plurality of detection elements and a laser emitter electrically connected to the detection elements. Each of the detection elements is used to detect the thickness at the cutting line of the solar cell, and the laser emitter is used to emit a laser to the solar cell to groove the cell. The number of detection elements corresponds to the number of laser emitters.

[0027] Furthermore, any of the aforementioned detection elements includes a first probe and a second probe, and the solar cell includes a first surface and a second surface disposed opposite to each other;

[0028] The first probe is used to contact the first surface, and the second probe is used to contact the second surface, with the positions of the first probe and the second probe corresponding to each other.

[0029] Furthermore, the number of the test items is 20 to 25.

[0030] Furthermore, the cutting device also includes a transport component disposed between the grooving mechanism and the slitting mechanism, the transport component being configured to transport the grooved solar cell onto the slitting mechanism.

[0031] Furthermore, the cutting device also includes a control unit, which is electrically connected to the grooving mechanism and the slicing mechanism respectively.

[0032] Compared with the prior art, this application has at least the following beneficial effects:

[0033] This application provides a solar cell cutting device, which includes a grooving mechanism and a slitting mechanism. The slitting mechanism includes multiple cutting structures that can cut along the grooves of the solar cell. Since adjacent cutting structures can form receiving positions, several cut solar cells will enter their corresponding receiving positions simultaneously with the cutting, thus achieving the purpose of slitting. In other words, the solar cell cutting device of this application simultaneously separates several cut solar cells while cutting the solar cell, thereby significantly reducing edge chipping and fragmentation, and improving the yield of the cut solar cells. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1This is a schematic diagram of cutting solar cells using the cutting device of this application;

[0036] Figure 2 This is a slicing mechanism provided in the embodiments of this application;

[0037] Figure 3 This is a cutting structure provided in an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the cutting section in the cutting device according to an embodiment of this application (also showing a solar cell located on the cutting section);

[0039] Figure 5 This is an application scenario diagram of a guide bevel of a cutting structure provided in an embodiment of this application;

[0040] Figure 6 This is a cross-sectional schematic diagram of a cutting section of a cutting structure provided in an embodiment of this application;

[0041] Figure 7 This is a cross-sectional schematic diagram of another cutting portion of the cutting structure provided in the embodiments of this application;

[0042] Figure 8 This is a cross-sectional schematic diagram of the cutting structure provided in the embodiments of this application;

[0043] Figure 9 This is a schematic diagram illustrating the application scenario of the slicing and sorting mechanisms provided in the embodiments of this application;

[0044] Figure 10 This is a schematic diagram illustrating an application scenario of the slotting mechanism provided in the embodiments of this application;

[0045] Figure 11 This is a schematic diagram of a solar cell after being processed by a grooving mechanism, as provided in an embodiment of this application.

[0046] Figure 12 This is a schematic diagram of the structure of the detection component provided in the embodiments of this application.

[0047] Icons: 1. Grooving mechanism; 11. Detection piece; 111. First probe; 112. Second probe; 2. Solar cell; 21. Cutting line; 22. Cutting groove; 3. Segmentation mechanism; 3a. Cutting position; 3b. Detection position; 3c. Drop position; 31. Cutting structure; 31a. Receiving position; 311. Main structure; 312. Cutting part; 313. Guide slope; 32. Conveying piece; 4. Sorting mechanism; 41. Sorting container. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0050] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0051] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0052] The technical solution provided by this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0053] In the solar cell cutting process, solar cells are first cut into pieces, and then several pieces of the cut solar cells are transferred using clamping tools to achieve the purpose of slab separation. Suction cups are a common clamping tool. However, if the suction cup's adhesion stability is poor or the shaking during transport is too violent, edge chipping or breakage of the solar cells may occur, affecting the yield of the cut solar cells. Furthermore, static electricity may be generated during the movement of the solar cells, causing a large number of particles to adhere to them, resulting in excessive accumulation of static charge and affecting the electrical performance of the solar cells.

[0054] Based on the above problems, this application provides a solar cell cutting device. Using this cutting device can greatly reduce the phenomena of edge chipping and fragmentation of solar cells, and improve the yield of the cut solar cells.

[0055] This application provides a solar cell cutting device, such as... Figure 1 and Figure 2 As shown, the cutting device includes:

[0056] The grooving mechanism 1 is used to groove the cutting line 21 of the solar cell so that a cutting groove 22 is formed at the cutting line 21 of the solar cell 2.

[0057] Slicing mechanism 3 includes multiple cutting structures 31, with receiving positions 31a formed between adjacent cutting structures 31. The cutting structures 31 are configured to cut solar cells 2 along the position of the cutting groove 22, and the receiving positions 31a are configured to place the cut solar cells 2.

[0058] The cutting apparatus provided in this application first uses a grooving mechanism 1 to groove the cutting line 21 of the solar cell, thereby forming a cutting groove 22 at the cutting line 21 of the solar cell. Furthermore, since the slicing mechanism 3 includes multiple cutting structures 31, the cutting structures 31 can cut the solar cell 2 along the cutting groove 22. And because adjacent cutting structures 31 form a receiving position 31a, the cut solar cell 2 is stored in the receiving position 31a. In other words, the cutting apparatus of this application can cut the solar cell 2 while simultaneously placing the cut solar cell 2 in the receiving position 31a, achieving the purpose of slicing. This helps reduce microcracks and breakage of the cut solar cell 2, improves the yield of the cut solar cell 2, and also helps reduce the electrostatic effect of the cut solar cell 2, improving the electrical performance of the solar cell 2.

[0059] Furthermore, such as 2 to Figure 5 As shown, the cutting structure 31 includes:

[0060] Main structural element 311;

[0061] Cutting part 312, the cutting part 312 is located along the length of the main body 311 (see Figure 2 At the edge of the solar cell 2 (in the Y direction), the cutting part 312 is used to abut against the cutting groove 22 of the solar cell 2 to cut the solar cell 2 along the position of the cutting groove 22;

[0062] Guide slope 313 is located below the cutting part 312 and is used to guide the cut solar cell 2 into the receiving position 31a.

[0063] The cutting structure 31 of this application includes a main body 311, a cutting part 312, and a guide slope 313. Therefore, when the cutting groove 22 of the solar cell 2 comes into contact with the cutting part 312 in the cutting structure 31, the solar cell 2 is cut into several solar cells 2 under stress, thus realizing the cutting of the solar cell 2. Since the guide slope 313 is located below the cutting part 312, the cut solar cell 2 will slide down along the guide slope 313 to the receiving position 31a of the solar cell 2, thus achieving the purpose of slicing and helping to improve the yield of the cut solar cell 2.

[0064] In the width direction perpendicular to the length of the main structure 311, the width of the cutting part 312 is less than or equal to the width of the cutting groove 22. This arrangement enables the cutting part 312 to effectively act on the cutting groove 22, reducing the difficulty of cutting.

[0065] In one alternative implementation, such as Figure 6 As shown, the cutting part 312 is a sharp corner. Because the cutting part 312 is designed with a sharp corner, this design reduces cutting resistance, lowers the difficulty of cutting, and ensures cutting accuracy. In another optional embodiment, such as... Figure 7 As shown, the cutting part 312 has an outwardly protruding arc top. This structural design makes the stress at the contact point between the cutting part 312 and the solar cell highly uniform, avoiding cracks and damage to the solar cell 2 during cutting, thereby improving the yield of the cut solar cell 2 to a greater extent.

[0066] Further, see the return Figure 6 The angle between the bottom surface of the main structure 311 and the guide slope 313 is α. When α is 40° to 50°, it promotes the sliding of the cut solar cell 2 to the receiving position 31a, which can effectively avoid the scratches caused by the sliding process of the solar cell 2 and improve the yield of the cut solar cell 2.

[0067] In one alternative implementation, such as Figure 8 As shown, the cross-section of the cutting structure 31 perpendicular to the length direction of the main body 311 is a quadrilateral structure, the cutting part 312 is located at the apex of the quadrilateral structure, and the guide slope 313 is located on the hypotenuse of the quadrilateral structure.

[0068] In another alternative implementation, see back Figure 6 The cross-section of the cutting structure 31 perpendicular to the length direction of the main body 311 is triangular, the cutting part 312 is located at the apex of the triangle, and the guide slope 313 is located on the hypotenuse of the triangle.

[0069] The apex of the triangle allows for precise contact with the cutting groove 22 of the solar cell 2, concentrating stress at the contact point and improving cutting accuracy. Furthermore, the cut solar cell 2 slides along the hypotenuse of the triangle to the receiving position 31a, reducing the likelihood of fragmentation or scratches. Additionally, the triangular design results in a smaller structural area, helping to reduce production costs.

[0070] When the material of the cutting structure 31 includes homopolymer polypropylene, the material has suitable hardness and softness, which allows the cutting part 312 to effectively act on the cutting groove 22 to achieve the cutting effect. In addition, the guide slope 313 has a buffering effect, which helps to reduce scratches on the solar cell 2 during the sliding process after cutting and improves the yield of the solar cell 2.

[0071] Furthermore, such as Figure 9 As shown, the cutting device also includes a sorting mechanism 4, which includes:

[0072] Test specimen, used to test the quality of the cut solar cell 2;

[0073] Sorting container 41 is used to place solar cells 2 after they have been tested.

[0074] The test components include an AOI test structure and a Halm test sorting device. The quality of solar cell 2 includes electrical performance and yield. Electrical performance includes photoelectric conversion efficiency, fill factor, short-circuit current, and open-circuit voltage. Yield includes thickness, fragmentation, and cell breakage. By using the test components to test the performance of solar cell 2, the solar cell 2 can be classified into different grades based on the measured data, thereby reducing energy loss caused by the high performance difference of solar cell 2 during the photovoltaic module manufacturing process.

[0075] In one optional embodiment, the cut solar cell 2 pieces are transferred to the test piece of the sorting mechanism 4 by the suction cup structure. After being tested by the test piece, the solar cell 2 pieces are transferred to the corresponding sorting container 41 by the suction cup structure according to the test results.

[0076] In another alternative embodiment, the slicing mechanism 3 further includes a conveyor 32, and the cutting structure 31 is disposed on the conveyor 32 along the conveying direction of the conveyor 32 (see [link]). Figure 9 (in the X direction), the slicing mechanism 3 includes a cutting position 3a, a dropping position 3c, and a detection position 3b located between the cutting position 3a and the dropping position 3c;

[0077] The cutting position 3a is configured to cut the slotted position of the solar cell 2, the position of the test piece corresponds to the detection position 3b of the slitting mechanism 3, the sorting container 41 is configured to move along the transport direction of the conveyor 32, and the dropping position 3c is configured to allow the cut solar cell 2 to fall into the sorting container 41.

[0078] The design of this application allows the cut solar cells 2 to fall directly into the sorting container 41, which simplifies the equipment, increases production efficiency, and effectively avoids fragmentation and edge breakage caused by transportation, thereby improving the yield of the solar cells 2.

[0079] Furthermore, when the sorting container 41 is below the drop position 3c, it ensures that the cut solar cells 2 can accurately fall into the sorting container 41, thus guaranteeing the accuracy of sorting.

[0080] Optionally, the sorting container 41 has multiple sorting positions for accommodating different types of solar cells, wherein the multiple sorting positions are used to place solar cells of different electrical performance levels respectively; the solar cells are classified according to their electrical performance levels, thereby assembling solar cells 2 with similar electrical performance together, ensuring the performance of the photovoltaic module.

[0081] Optionally, multiple sorting positions are used to place good and bad solar cells 2 respectively; through the above structural settings, the good and bad solar cells 2 are classified, thereby helping to improve the assembly performance of solar cells 2 to a greater extent.

[0082] Optionally, multiple sorting positions are used to place solar cells 2 of different thicknesses respectively; by dividing the thickness, solar cells 2 with similar absorption of sunlight are assembled together, thus ensuring the performance of the photovoltaic module.

[0083] Optionally, multiple sorting locations are used to place solar cells 2 with different damaged locations. Different damaged locations have different effects on the performance of solar cells 2. With this setting, solar cells 2 with complementary performance can be assembled together, ensuring the performance of the photovoltaic module.

[0084] Furthermore, such as Figure 10 and Figure 11 As shown, where, Figure 11 The dashed line in the figure represents the depth of laser grooving. The grooving mechanism 1 includes multiple detection elements 11 and a laser emitter electrically connected to the detection elements 11. Each detection element 11 is used to detect the thickness at the cutting line 21 of the solar cell 2. The laser emitter is used to emit a laser to the solar cell 2 to groove. The number of detection elements 11 corresponds to the number of laser emitters.

[0085] The number of detection elements 11 in this application is the same as the number of laser emitters. Therefore, based on the thickness measured by one of the detection elements 11, the laser emitter connected to it emits a laser accordingly, thereby achieving targeted grooving at different positions of the cutting line 21 of the solar cell 2. The grooving equipment of this application can adjust the laser parameters according to the thickness of the solar cell 2, and will not result in the grooving of the solar cell 2 being too deep or too shallow due to the same laser power of the solar cell 2. It can effectively ensure the uniformity of the grooving depth of the solar cell 2 after grooving, thereby facilitating the subsequent cutting by the cutting mechanism.

[0086] In one alternative embodiment, the detection element 11 includes an ultrasonic probe that emits ultrasonic pulses that reach the solar cell 2 and are reflected back, thereby calculating the thickness of the solar cell 2 based on the reflection time and propagation speed.

[0087] In another alternative implementation, such as Figure 12 As shown, any one of the detection elements 11 includes a first probe 111 and a second probe 112, and the solar cell 2 includes a first surface and a second surface arranged opposite to each other.

[0088] The first probe 111 is used to contact the first surface, and the second probe 112 is used to contact the second surface. The positions of the first probe 111 and the second probe 112 correspond to each other.

[0089] By employing a probe-based contact measurement method, subtle changes on the surface of solar cell 2 can be accurately detected, resulting in high measurement precision. This ensures the effectiveness of subsequent cutting and reduces damage caused by cutting.

[0090] Furthermore, the number of test pieces 11 is 20 to 25.

[0091] When the number of test pieces 11 is within the above range, the accuracy of the measurement is guaranteed to be higher, and the thickness of different areas of the cutting line 21 in the solar cell 2 can be effectively reflected, thereby ensuring a low damage rate during cutting.

[0092] Furthermore, the cutting device also includes a transport component, which is disposed between the grooving mechanism 1 and the slitting mechanism 3. The transport component is configured to transport the grooved solar cells 2 onto the slitting mechanism 3. The transport component includes a suction cup structure.

[0093] Furthermore, the cutting device also includes a control unit, which is electrically connected to the grooving mechanism 1 and the slitting mechanism 3. By setting up the control unit, automated processing is achieved, reducing the difficulty of processing.

[0094] The working process of the solar cell cutting device of this application is described below:

[0095] First, solar cells are individually loaded and transferred to the grooving mechanism. The grooving mechanism uses a first and second probe press-fit method to obtain the thickness distribution at different positions along the cutting line of the solar cell. Then, the control unit automatically adjusts the process parameters of the laser emitter based on the thickness distribution, with different power corresponding to different thicknesses, thus performing laser grooving on the solar cell and preparing it for the next cutting step. The grooved solar cell is then transported to the slitting mechanism using a transporter. The cutting structure in the slitting mechanism has a triangular cross-section perpendicular to the length of the main structure. The apex of the triangle is used to cut the groove, and the hypotenuse is used to transport the cut solar cell to the receiving position. Under the transport of the conveyor in the slitting mechanism, the cut solar cell enters the detection position and is tested by the testers in the sorting mechanism to obtain the quality of the cut solar cell. Next, the control unit transmits the detected data to the sorting container. The sorting container moves along the transport direction of the conveyor, dropping the solar cell from the drop position into its corresponding sorting position, thus achieving the testing and sorting of the solar cells.

[0096] The above provides a detailed description of a solar cell cutting device disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the solar cell cutting device. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cutting device for solar cells, characterized in that, The cutting device comprises: a slotting mechanism for slotting at the cutting line of a solar cell to form a cutting slot at the cutting line of the solar cell; a dicing mechanism comprising a plurality of cutting structures, a receiving site being formed between adjacent cutting structures, the cutting structures being configured to cut the solar cell along the position of the cutting slot, and the receiving site being configured to place the cut solar cell.

2. The cutting device of claim 1, wherein, The cutting structure comprises: a structure body; a cutting portion located at the edge of the structure body along the length direction of the structure body, the cutting portion being configured to abut against the cutting slot of the solar cell to cut the solar cell along the position of the cutting slot; a guide slope located below the cutting portion, the guide slope being configured to guide the cut solar cell to be placed in the receiving site.

3. The cutting device of claim 2, wherein, The included angle between the bottom surface of the structure body and the guide slope is 40°-50°; and / or, The cutting portion is a sharp corner portion or an outwardly convex arc top portion; and / or, In the width direction perpendicular to the length direction of the structure body, the width of the cutting portion is less than or equal to the width of the cutting slot.

4. The cutting device of claim 2, wherein, The cross section of the cutting structure perpendicular to the length direction of the structure body is a triangle, the cutting portion is located at the top corner of the triangle, and the guide slope is located at the hypotenuse of the triangle.

5. The cutting device of claim 1, wherein, The material of the cutting structure comprises homopolymer polypropylene.

6. The cutting device of claim 1, wherein, The cutting device further comprises a sorting mechanism, the sorting mechanism comprising: a testing member for detecting the quality of the cut solar cell; a sorting container for placing the solar cell after being detected by the testing member.

7. The cutting device of claim 6, wherein, The dicing mechanism further comprises a conveying member, the cutting structures being arranged on the conveying member, along the conveying direction of the conveying member, the dicing mechanism comprising a cutting site, a falling site, and a detection site located between the cutting site and the falling site; wherein the cutting site is configured to cut the solar cell at the slotting position, the position of the testing member corresponds to the detection site of the dicing mechanism, the sorting container is configured to move along the conveying direction of the conveying member, and the falling site is configured to make the cut solar cell fall into the sorting container.

8. The cutting device of claim 6, wherein, The sorting container is located below the falling site; and / or, The sorting container has a plurality of sorting positions for accommodating different types of solar cells; wherein a plurality of the sorting positions are used to respectively place solar cells of different electrical performance levels; and / or, A plurality of the sorting positions are used to respectively place good and bad pieces of the solar cell; and / or, A plurality of the sorting positions are used to respectively place solar cells of different thicknesses; and / or, A plurality of the sorting positions are used to respectively place solar cells having different breakage positions.

9. The cutting device of claim 1, wherein, The slotting mechanism comprises a plurality of detecting pieces, and a laser emitter electrically connected with the detecting pieces, any detecting piece is used for detecting the thickness at the cutting line of the solar cell, the laser emitter is used for emitting laser to the solar cell for slotting, the number of the detecting pieces corresponds to the number of the laser emitter.

10. The cutting device of claim 9, wherein, Any detecting piece comprises a first probe and a second probe, and the solar cell comprises a first surface and a second surface arranged oppositely; The first probe is used for contacting the first surface, the second probe is used for contacting the second surface, and the position of the first probe corresponds to the position of the second probe.

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