Testing device for solar cell

Abstract

The utility model provides a solar cell testing device, and relates to the technical field of solar cell testing equipment. The testing device of the solar cell comprises a base and a measuring device. Wherein the base is used for supporting the battery piece; the measuring device is located above the base, the relative position of the measuring device and the base is adjustable, the measuring device comprises a frame and at least one testing assembly arranged at the frame, and each testing assembly comprises a conductive metal piece capable of making contact with the to-be-tested surface of the battery piece and a connecting assembly connecting the two ends of the conductive metal piece to the frame. The tightness between the connecting assembly and the frame is adjustable, so that the tightness of each conductive metal piece and the distance between two adjacent conductive metal pieces are adjustable. According to the utility model, the distance between the two adjacent conductive metal pieces in the testing device is adjustable, so that the testing device can be adapted to battery pieces with different grid lines, and the application range is expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell testing equipment technical field especially relates to a solar cell piece's testing arrangement. BACKGROUND

[0002] With the continuous development of solar cell piece technology in recent years, PEAR, TopCon, BC and HJT technologies are iterated and parallel, and the requirements of EL detection (electricity to light) and IV detection (photoelectric conversion efficiency) are continuously improved. With the rapid development of crystalline silicon solar cell production in recent years, the solar industry has rapidly risen, which will inevitably increase competition in the same industry, and cost reduction and efficiency improvement have become the main development goal of the solar manufacturing industry. Increasing the number of main grids on the cell piece can reduce Rs (series resistance) and reduce the loss of Isc (short circuit current) caused by broken grids. However, the increase in the number of main grids will inevitably increase the consumption of silver paste, so in order to reduce silver consumption and reduce costs, people will make the traditional continuous main grid line into many fine grid lines (or called no main grid). Such multi-grid line design will cause the problem of poor test contact. The traditional epoxy resin probe rack itself does not have conductivity, and whether it is PCB or epoxy resin probe structure, the shielding area is large, and the test contact completely depends on the contact between the probe head and the cell piece, and it cannot be contacted with the silicon wafer.

[0003] In the existing technology, in order to increase the contact area during testing, conductive pressure strips are used instead of traditional probe structures. The spacing of these conductive pressure strip supports is fixed and cannot be changed, so it cannot adapt to cell pieces with different grid line spacings, resulting in low accuracy and limited application range. SUMMARY

[0004] One object of the first aspect of the utility model is to provide a solar cell piece testing device that solves the problem of the existing technology that the testing device cannot detect cell pieces with different grid line spacings.

[0005] Another object of the first aspect of the utility model is to solve the problem of the existing technology that the tightness of the conductive metal parts cannot be adjusted.

[0006] In particular, the utility model provides a solar cell piece testing device for testing the electrical performance of the cell piece, comprising:

[0007] a base for supporting the cell piece; and

[0008] A measuring device is located above the base and is adjustable in position relative to the base, the measuring device comprising a frame and at least one test component arranged at the frame, each test component comprising an electrically conductive metal piece capable of contacting a surface of the battery sheet to be tested and a connecting component connecting both ends of the electrically conductive metal piece to the frame, the tightness between the connecting component and the frame being adjustable, so that the tightness of each electrically conductive metal piece and the distance between two adjacent electrically conductive metal pieces are adjustable.

[0009] Optionally, two fixing members are arranged at the frame in opposite positions; each fixing member is provided with at least one first through hole extending in a direction perpendicular to the electrically conductive metal piece;

[0010] Each connecting component comprises a first connecting member and a second connecting member, the first connecting member is connected to the fixing member through the second connecting member after passing through the first through hole, the tightness of the electrically conductive metal piece is adjusted by the relative position between the second connecting member and the first connecting member, and the distance between two electrically conductive metal pieces is adjusted after loosening the first connecting member and the second connecting member.

[0011] Optionally, the fixing member is further provided with a second through hole parallel to the first through hole, the first connecting member is fastened to the fixing member after passing through the first through hole again after passing through the second through hole, wherein the cross section of the first connecting member at the position passing through the second through hole is square to prevent the first connecting member from rotating relative to the fixing member.

[0012] Optionally, the first through hole, the second through hole and the electrically conductive metal piece are located in the same plane.

[0013] Optionally, each connecting component further comprises a tension spring connecting the electrically conductive metal piece and the first connecting member.

[0014] Optionally, the base comprises:

[0015] At least one adjusting guide rail, each adjusting guide rail is provided with at least one third through hole extending in a direction perpendicular to the electrically conductive metal piece;

[0016] At least one support member, each support member is parallel to the electrically conductive metal piece; each support member is arranged on the adjusting guide rail and is detachably connected to the adjusting guide rail by passing through the third through hole with a fastener.

[0017] Optionally, the number of support members is the same as the number of electrically conductive metal pieces, and each support member is arranged corresponding to one electrically conductive metal piece when the measuring device measures the battery sheet.

[0018] Optionally, upper surfaces of the plurality of support members collectively form a support surface for supporting the solar cell; and the upper surface of each of the support members is arc-shaped, such that the support surface is arc-shaped.

[0019] Optionally, the base further comprises at least one adjusting auxiliary block, each of the adjusting auxiliary blocks comprising at least one positioning protrusion for adjusting the distance between two adjacent support members by matching the positioning protrusion with the support members.

[0020] Optionally, the base further comprises:

[0021] a fixing plate arranged below the adjusting guide rail for supporting the adjusting guide rail;

[0022] a jointing plate arranged below the fixing plate for supporting the fixing plate, the jointing plate being provided with two parallel guide grooves, the extension direction of the guide grooves being perpendicular to the plane where the support members are located, the fixing plate being capable of sliding along the guide grooves and being fastened by fasteners after reaching a preset position.

[0023] The test device of the present application can comprise a base and a measuring device, the measuring device can comprise a frame and at least one test component, the test component can comprise a conductive metal piece and a connecting component, the tightness between the connecting component and the frame being adjustable, so that the distance between two adjacent conductive metal pieces is adjustable, thereby the measuring device can be adapted to solar cells with different grid lines, thereby increasing the application range. In addition, the tightness between the connecting component and the frame of the present application is adjustable, so that the tightness of the conductive metal piece connected by each connecting component is adjustable, thereby avoiding that the conductive metal piece is too loose to contact the test component, and also avoiding that the conductive metal piece is too tight to cause the conductive metal piece to break or the test component (solar cell) to crack or break.

[0024] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of some embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] Some specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are presented by way of illustration and not of limitation. The same reference numbers in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the drawings:

[0026] Figure 1 is a schematic perspective view of a test device for a solar cell according to one specific embodiment of the present application;

[0027] Figure 2is a schematic side view of a testing device for solar cell pieces according to one specific embodiment of the present application;

[0028] Figure 3 is a schematic structural view of a measuring device according to one specific embodiment of the present application;

[0029] Figure 4 is a schematic structural view of a testing assembly connected to a fixing member according to one specific embodiment of the present application;

[0030] Figure 5 is Figure 4 a partial enlarged schematic view;

[0031] Figure 6 is a schematic perspective view of a base connected to an adjusting auxiliary block according to one specific embodiment of the present application;

[0032] Figure 7 is a schematic perspective view of a base according to one specific embodiment of the present application;

[0033] Figure 8 is a top view of a base according to one specific embodiment of the present application;

[0034] Figure 9 is a schematic perspective view of a supporting member according to one specific embodiment of the present application;

[0035] Figure 10 is a side view of a supporting member according to one specific embodiment of the present application.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS

[0037] a testing device 100 for solar cell pieces;

[0038] a base 200, an adjusting guide rail 210, a third through hole 211, a supporting member 220, an upper surface 221, a supporting surface 222, a threaded hole 223, an adjusting auxiliary block 230, a fixing plate 240, a combined needle plate 250, a guide groove 251;

[0039] a measuring device 300, a frame 310, a fixing member 311, a first through hole 312, a second through hole 313, a testing assembly 320, a conductive metal member 321, a connecting assembly 322, a first connecting member 3221, a second connecting member 3222, a tension spring 3223, a solar cell piece 400. DETAILED DESCRIPTION

[0040] In the description of the present embodiment, it needs to be understood that the terms "length", "width", "height", "upper", "lower", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.

[0041] As a specific embodiment of the present utility model, as shown in Figure 1 and Figure 2 The present embodiment provides a solar cell testing device 100 for testing the electrical performance of the cell. The solar cell testing device 100 can include a base 200 and a measuring device 300. The base 200 is used to support the cell 400. The measuring device 300 is located above the base 200 and its relative position to the base 200 is adjustable. The measuring device 300 can include a frame 310 and at least one test component 320 arranged on the frame 310. Each test component 320 includes a conductive metal piece 321 capable of contacting the surface of the cell 400 to be tested and a connecting component 322 connecting both ends of the conductive metal piece 321 to the frame 310. The tightness between the connecting component 322 and the frame 310 is adjustable, so that the tightness of each conductive metal piece 321 and the distance between adjacent two conductive metal pieces 321 are adjustable.

[0042] Specifically, the testing device 100 of the present embodiment can include a base 200 and a measuring device 300. The measuring device 300 can include a frame 310 and at least one test component 320. The test component 320 can include a conductive metal piece 321 and a connecting component 322. The tightness between the connecting component 322 and the frame 310 is adjustable, so that the distance between adjacent two conductive metal pieces 321 is adjustable, and thus the measuring device 300 can be adapted to different grid line cell 400, thereby increasing the application range. In addition, the tightness between the connecting component 322 and the frame 310 of the present embodiment is adjustable, so that the tightness of the conductive metal piece 321 connected by each connecting component 322 is adjustable, thereby avoiding the poor contact of the conductive metal piece 321 with the component to be tested due to too loose, and avoiding the fracture of the conductive metal piece 321 or the hidden crack or fragment of the component to be tested (cell) due to too tight.

[0043] Specifically, the conductive metal piece 321 of the embodiment can be a metal wire or a metal strip. Specifically, the conductive metal piece 321 of the embodiment can be a gold-plated copper wire or a gold-plated copper strip. The copper wire or copper strip has a low cost and a certain flexibility. The conductive metal piece 321 in the entire measuring device 300 is flexible. In the embodiment, if the conductive metal piece 321 is a gold-plated copper strip, the width of the gold-plated copper strip can be about 2 mm, and the thickness can be about 0.2 mm, so that the conductive metal piece 321 can be in sufficient contact with the grid line of the battery piece 400, solve the contact problem caused by the linear structure, avoid poor stability in the testing process, and improve the detection accuracy.

[0044] As a specific embodiment of the utility model, as shown in the figure, Figures 3-5 The frame 310 is provided with two fixed parts 311 arranged oppositely. Each fixed part 311 is provided with at least one first through hole 312 extending in a direction perpendicular to the conductive metal piece 321.

[0045] Specifically, both ends of each conductive metal piece 321 of the embodiment are connected to a connecting assembly 322. Each connecting assembly 322 can include a first connecting piece 3221 and a second connecting piece 3222. The first connecting piece 3221 passes through the first through hole 312 and is connected to the fixed part 311 through the second connecting piece 3222. Then, the relative position between the second connecting piece 3222 and the first connecting piece 3221 is adjusted to adjust the tightness of the conductive metal piece 321, and the distance between the two conductive metal pieces 321 is adjusted after the first connecting piece 3221 and the second connecting piece 3222 are loosened.

[0046] Specifically, the first connecting piece 3221 of the embodiment can be a bolt, and the second connecting piece 3222 can be a nut, and the nut can be two. The bolt passes through the first through hole 312, one end is connected to the conductive metal piece 321, and the other end has external threads. The tightness is adjusted by screwing the two nuts through the external threads. When the two nuts are screwed, the position of the bolt at the first through hole 312 is adjusted, and then the distance between the conductive metal pieces 321 is adjusted. When the two nuts are screwed, the position of the bolt in the axial direction relative to the fixed part 311 can also be adjusted, and then the tightness of the conductive metal piece 321 is adjusted.

[0047] As a specific embodiment of the utility model, the fixed part 311 of the embodiment is further provided with a second through hole 313 parallel to the first through hole 312. The first connecting piece 3221 passes through the second through hole 313 and then passes through the first through hole 312 to be tightly connected to the fixed part 311. The cross section of the first connecting piece 3221 at the second through hole 313 is square to prevent the first connecting piece 3221 from rotating relative to the fixed part 311.

[0048] Specifically, the first connecting piece 3221 of the embodiment passes through the second through hole 313, the cross section of the first connecting piece 3221 is square, and the size of the first connecting piece 3221 matches the size of the second through hole 313, so that the first connecting piece 3221 cannot rotate relative to the fixed part 311 when the second connecting piece 3222 is rotated and screwed with the first connecting piece 3221.

[0049] Specifically, the first through hole 312, the second through hole 313 and the conductive metal piece 321 of the embodiment are located in the same plane.

[0050] As a specific embodiment of the utility model, each connecting assembly 322 of the embodiment can further include a tension spring 3223 and a fishhook buckle 3224 connected in sequence, the tension spring 3223 is connected with the first connecting piece 3221 in the connecting assembly 322, and the fishhook buckle 3224 is connected with the conductive metal piece 321.

[0051] Specifically, the connecting assembly 322 of the embodiment can include a tension spring 3223, the conductive metal piece 321 and the first connecting piece 3221 are connected through the tension spring 3223, and the two ends of the conductive metal piece 321 can have a certain elastic force when being connected to the fixed part 311 through the tension spring 3223, so that the conductive metal piece 321 can be tensioned, and at the same time, hidden cracks or damage of the battery piece 400 can be avoided when the battery piece 400 is tested.

[0052] As a specific embodiment of the utility model, the number of the test assemblies 320 of the embodiment is multiple, and the multiple test assemblies 320 are arranged in parallel and at intervals.

[0053] As a specific embodiment of the utility model, as shown in Figures 6-8 The base 200 of the embodiment can include at least one adjusting guide rail 210 and at least one supporting part 220. At least one third through hole 211 extending along a direction perpendicular to the conductive metal piece 321 is arranged at each adjusting guide rail 210. Each supporting part 220 is parallel to the conductive metal piece 321. Each supporting part 220 is arranged on the adjusting guide rail 210, and the supporting part 220 and the adjusting guide rail 210 are detachably connected through the third through hole 211 by using a fastener.

[0054] Specifically, as shown in Figure 8 And Figure 9As shown, the embodiment adjusts the support piece 220 on the adjusting guide rail 210, and a third through hole 211 is arranged on the adjusting guide rail 210. A corresponding threaded hole 223 is arranged at the bottom of the support piece, and the support piece 220 is arranged at the adjusting guide rail 210 by passing the fastener through the third through hole 211 and then through the threaded hole 223. The tightness between the support piece 220 and the adjusting guide rail 210 can be adjusted by adjusting the tightness of the fastener, and then the distance between the support pieces 220 can be adjusted when the support pieces 220 are relatively loose with the adjusting guide rail 210, and the support pieces 220 are fastened after reaching the target position.

[0055] Specifically, the support piece 220 of the embodiment can be a copper bar.

[0056] Specifically, the number of the support piece 220 of the embodiment is the same as the number of the conductive metal piece 321, and each support piece 220 is arranged correspondingly with one conductive metal piece 321 when the measuring device 300 measures the battery piece 400.

[0057] Specifically, the embodiment uses the support piece 220 to support the battery piece 400, and the conductive metal piece 321 presses the battery piece 400 when the measuring device 300 measures the battery piece 400. At this time, the conductive metal piece 321 is arranged correspondingly with the support piece 220, which not only ensures good contact, but also avoids causing the battery piece 400 to crack or break when the conductive metal piece 321 presses the battery piece 400.

[0058] As a specific embodiment of the utility model, Figure 10 As shown, the upper surfaces 221 of the plurality of support pieces 220 of the embodiment jointly form a support surface 222 (as shown in Figure 2 As shown) for supporting the battery piece 400. And the upper surface 221 of each support piece 220 is an arc structure, so that the support surface 222 is an arc surface.

[0059] Specifically, the upper surface of the support piece 220 in the embodiment is formed as an arc surface, so that the height of the connecting assembly 322 at both ends can be slightly lower than the height of the upper surface 221 when the test assembly 320 tests the battery piece 400, so as to ensure better contact between the conductive metal piece 321 and the battery piece 400, without touching the support piece 220.

[0060] Specifically, the upper surface 221 of the support piece 220 of the embodiment is formed as an arc structure, so that the support surface 222 is an arc surface. Specifically, the arc structure is high in the middle and low at both ends, and the arc transitions. In this way, when the battery piece 400 is placed on the support surface 222, the middle of the battery piece 400 is supported slightly higher than the two sides, so that the conductive metal piece 321 and the battery piece 400 are in better contact.

[0061] As a specific embodiment of the present application, as shown in Figure 6 The test device 100 of the present embodiment can further include at least one adjusting auxiliary block 230 arranged at the end of the side of the support 220. Each adjusting auxiliary block 230 can include at least one positioning protrusion (not shown in the figure) to adjust the distance between the two adjacent supports 220 by cooperating the positioning protrusion with the support 220.

[0062] Specifically, the number of the adjusting auxiliary block 230 of the present embodiment can be two, arranged at the two ends of the side of each support 220. The size of the positioning protrusion on each adjusting auxiliary block 230 can be set in advance, and the positioning protrusion can be clamped between the supports 220, and the distance between the supports 220 is limited by the size of the positioning protrusion.

[0063] Specifically, first, the support 220 and the adjusting guide rail 210 need to be loosened by screwing the fastener, and then the adjusting auxiliary block 230 customized in advance is clamped with the support 220, so that the positioning protrusion is clamped between the two adjacent supports 220, and after adjustment, the support 220 and the adjusting guide rail 210 are fastened by screwing the fastener.

[0064] As a specific embodiment of the present application, as shown in Figure 6 and Figure 7 The base 200 of the present embodiment can further include a fixed plate 240 and a needle plate 250. The fixed plate 240 is arranged below the adjusting guide rail 210 to support the adjusting guide rail 210. The needle plate 250 is arranged below the fixed plate 240 to support the fixed plate 240, and the needle plate 250 is provided with two parallel guide grooves 251, the extension direction of the guide grooves 251 is perpendicular to the plane where the support 220 is located, the fixed plate 240 can slide along the guide grooves 251, and is fastened after reaching the preset position by using the fastener.

[0065] At this point, those skilled in the art should recognize that although the present application has been shown and described in detail in the above embodiments, many other variations or modifications can be determined or deduced directly according to the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variations or modifications.

Claims

1. A testing device for solar cell, for testing the electrical performance of the cell, characterized in that, The utility model relates to a solar cell testing device, comprising: a base for supporting the solar cell; and a measuring device located above the base and adjustable in relative position with the base, the measuring device comprising a frame and at least one testing component provided at the frame, each testing component comprising an electrically conductive metal piece capable of contacting a surface of the solar cell to be tested and a connecting component connecting both ends of the electrically conductive metal piece to the frame, the tightness between the connecting component and the frame being adjustable, thereby making the tightness of each electrically conductive metal piece and the distance between two adjacent electrically conductive metal pieces adjustable; two fixing members oppositely arranged at the frame are provided, each fixing member being provided with at least one first through hole extending in a direction perpendicular to the electrically conductive metal piece; each connecting component comprises a first connecting member and a second connecting member, the first connecting member being connected to the fixing member through the second connecting member after passing through the first through hole, thereby adjusting the tightness of the electrically conductive metal piece through the relative position between the second connecting member and the first connecting member and adjusting the distance between two electrically conductive metal pieces after loosening the first connecting member and the second connecting member.

2. The solar cell testing device according to claim 1, wherein a second through hole parallel to the first through hole is further provided at the fixing member, the first connecting member being fastened to the fixing member after passing through the second through hole and then the first through hole, wherein the cross section of the first connecting member at the second through hole is square-shaped to prevent the first connecting member from rotating relative to the fixing member.

3. The solar cell testing device according to claim 2, wherein the first through hole, the second through hole and the electrically conductive metal piece are located in the same plane.

4. The solar cell testing device according to any one of claims 1-3, wherein each connecting component further comprises a tension spring connecting the electrically conductive metal piece and the first connecting member.

5. The solar cell testing device according to any one of claims 1-3, wherein the base comprises: at least one adjusting guide rail, each adjusting guide rail being provided with at least one third through hole extending in a direction perpendicular to the electrically conductive metal piece; at least one support member, each support member being parallel to the electrically conductive metal piece; each support member being placed on the adjusting guide rail and being detachably connected to the adjusting guide rail by passing through the third through hole with a fastener.

6. The solar cell testing device according to claim 5, wherein the number of support members is the same as the number of electrically conductive metal pieces, and each support member is correspondingly arranged with one electrically conductive metal piece when the measuring device measures the solar cell.

7. The solar cell testing device according to claim 5, wherein the upper surfaces of the plurality of support members collectively form a support surface for supporting the solar cell; and the upper surface of each support member is arc-shaped, so that the support surface is arc-shaped. 8.The testing device of solar cell according to claim 5, characterized in that, at least one adjusting auxiliary block is further included, each of the adjusting auxiliary blocks comprises at least one positioning protrusion, and the distance between two adjacent support members is adjusted by matching the positioning protrusion with the support member. 9.The testing device of solar cell according to claim 5, characterized in that, the base further comprises: a fixed plate arranged below the adjusting guide rail and used for supporting the adjusting guide rail; a jointing plate arranged below the fixed plate and used for supporting the fixed plate, two parallel guide grooves are arranged on the jointing plate, the extension direction of the guide grooves is perpendicular to the plane where the support member is located, the fixed plate can slide along the guide grooves, and the fixed plate is fastened by using a fastener after reaching a preset position.

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