Testing device for solar cell
By designing an adjustable test device, the problem of the inability to detect the tightness and unadjustment of battery cells and conductive metal parts in the prior art is solved, and a higher detection accuracy and a wider application range are achieved.
Patent Information
- Application Number
- CN202411190148.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2024-12-20
AI Technical Summary
The existing solar cell test devices cannot adapt to cell cells with different gate line spacings, and the tightness of the conductive metal parts is unadjustable, resulting in low test accuracy and limited application range.
A test device including an adjustable base and a measuring device is designed. The measuring device consists of a frame, a test assembly and a connecting assembly. The elasticity between the connecting assembly and the frame is adjustable, and the distance between the conductive metal parts is also adjustable to ensure that the The battery cells are in good contact to avoid poor contact or damage.
This device can adapt to battery cells of different gate lines, improve detection accuracy, avoid poor contact or damage caused by improper tightness of conductive metal parts, and expand the application range.
Smart Images
Figure CN119171837A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of solar cell testing equipment, in particular to a testing device for solar cell sheets. Background Art
[0002] With the continuous development of solar cell technology in recent years, PEAR, TopCon, BC and HJT technologies have been continuously iterated and parallelized, and the requirements for EL detection (electric to luminescence) and IV detection (photoelectric conversion efficiency) have been continuously improved. With the rapid development of crystalline silicon solar cell production in recent years and the rapid rise of the solar industry, competition in the same industry is bound to increase, and cost reduction and efficiency increase have become the main development goals of the solar manufacturing industry. Increasing the number of main grids on the cell can reduce Rs (series resistance) and reduce Isc (short-circuit current) losses 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 lines into many thin grid lines (or no main grid). Such a multi-grid line design will lead to the problem of poor test contact. The traditional epoxy resin probe rack itself is not conductive, and the probe structure of both PCB and epoxy resin has a large shielding area. The test contact is completely dependent on the contact between the probe head and the cell, and it is impossible to contact the silicon wafer with the surface.
[0003] In the current existing technology, in order to increase the contact area during testing, conductive voltage bars are used instead of traditional probe structures. However, the spacing of these conductive voltage bar brackets is fixed and cannot adapt to cells with different grid line spacings, so the accuracy is low and the application range is also limited. Summary of the invention
[0004] An object of the first aspect of the present invention is to provide a test device for solar cells, so as to solve the problem that the test device in the prior art cannot detect cells with different grid line spacings.
[0005] Another object of the first aspect of the present invention is to solve the problem in the prior art that the tightness between the conductive metal parts cannot be adjusted.
[0006] In particular, the present invention provides a testing device for a solar cell, which is used to test the electrical performance of the cell, comprising: A base for supporting the battery cell; and A measuring device is located above the base and has an adjustable relative position to the base, the measuring device includes a frame and at least one test component arranged on the frame, each of the test components includes a conductive metal piece capable of contacting the surface to be tested of the battery cell and a connecting component connecting both ends of the conductive metal piece to the frame, the tightness between the connecting component and the frame is adjustable, thereby making the tightness of each conductive metal piece and the distance between two adjacent conductive metal pieces adjustable.
[0007] Optionally, the frame is provided with two fixing members arranged opposite to each other; each of the fixing members is provided with at least one first through hole extending in a direction perpendicular to the conductive metal member; Each of the connecting components includes a first connecting member and a second connecting member. The first connecting member passes through the first through hole and is connected to the fixing member through the second connecting member. The tightness of the conductive metal member is adjusted by the relative position between the second connecting member and the first connecting member, and the distance between the two conductive metal members is adjusted after loosening the first connecting member and the second connecting member.
[0008] Optionally, a second through hole parallel to the first through hole is further provided at the fixing member, and the first connecting member passes through the second through hole and then through the first through hole to be fastened to the fixing member, wherein the cross-section of the first connecting member at the point where it passes through the second through hole is square to prevent the first connecting member from rotating relative to the fixing member.
[0009] Optionally, the first through hole, the second through hole and the conductive metal member are located in the same plane.
[0010] Optionally, each of the connecting components further includes a tension spring, and the tension spring connects the conductive metal member and the first connecting member.
[0011] Optionally, the base comprises: At least one adjusting rail, each of the adjusting rails being provided with at least one third through hole extending in a direction perpendicular to the conductive metal member; At least one support member, each of which is parallel to the conductive metal member; each of which is placed on the adjustment rail, and is detachably connected to the adjustment rail by fasteners passing through the third through hole.
[0012] Optionally, the number of the support members is the same as the number of the conductive metal members, and when the measuring device measures the battery cell, each of the support members is arranged corresponding to one of the conductive metal members.
[0013] Optionally, the upper surfaces of the plurality of support members together form a support surface for supporting the battery cell; and the upper surface of each support member is an arc-shaped structure, so that the support surface is an arc-shaped surface.
[0014] Optionally, at least one adjustment auxiliary block is further included, and each of the adjustment auxiliary blocks includes at least one positioning protrusion, so that the distance between two adjacent support members can be adjusted by cooperating the positioning protrusion with the support member.
[0015] Optionally, the base further comprises: A fixing plate, disposed below the adjusting guide rail, and used for supporting the adjusting guide rail; The needle closing plate is arranged under the fixed plate and is used to support the fixed plate. Two parallel guide grooves are arranged on the needle closing 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 be fastened with fasteners after reaching the preset position.
[0016] The test device of the present solution may include a base and a measuring device, the measuring device may include a frame and at least one test component, the test component may include a conductive metal part and a connecting component, the tightness between the connecting component and the frame is adjustable, so that the distance between two adjacent conductive metal parts is adjustable, thereby allowing the measuring device to adapt to battery cells with different grid lines, thereby increasing the scope of application. In addition, the tightness between the connecting component and the frame of the present solution is adjustable, so that the tightness of the conductive metal parts connected to each connecting component is adjustable, thereby avoiding poor contact between the conductive metal parts and the components to be tested due to being too loose, and also avoiding the conductive metal parts being too tight, resulting in the breakage of the conductive metal parts or the hidden cracks or fragments of the components to be tested (battery cells).
[0017] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 is a schematic three-dimensional diagram of a testing device for a solar cell according to a specific embodiment of the present invention; Figure 2 is a schematic side view of a testing device for a solar cell according to a specific embodiment of the present invention; Figure 3is a schematic structural diagram of a measuring device according to a specific embodiment of the present invention; Figure 4 is a schematic structural diagram of a test assembly connected to a fixing member according to a specific embodiment of the present invention; Figure 5 yes Figure 4 A partial enlarged schematic diagram of Figure 6 is a schematic stereoscopic diagram of the connection between a base and an adjustment auxiliary block according to a specific embodiment of the present invention; Figure 7 is a schematic three-dimensional diagram of a base according to a specific embodiment of the present invention; Figure 8 is a top view of a base according to a specific embodiment of the present invention; Fig. 9 is a schematic three-dimensional diagram of a support member according to a specific embodiment of the present invention; Fig.10 is a side view of a support member according to a specific embodiment of the present invention.
[0019] Description of reference numerals: A testing device 100 for a solar cell; Base 200; adjustment rail 210; third through hole 211; support member 220; upper surface 221; support surface 222; threaded hole 223; adjustment auxiliary block 230; fixing plate 240; needle plate 250; guide groove 251; Measuring device 300 ; frame 310 ; fixing member 311 ; first through hole 312 ; second through hole 313 ; testing component 320 ; conductive metal member 321 ; connecting component 322 ; first connecting member 3221 ; second connecting member 3222 ; tension spring 3223 ; battery cell 400 . DETAILED DESCRIPTION
[0020] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0021] As a specific embodiment of the present invention, Figure 1 and Figure 2As shown, this embodiment provides a test device 100 for a solar cell, and the test device 100 for a solar cell is used to test the electrical properties of the cell. The test device 100 for a solar cell may 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 may include a frame 310 and at least one test assembly 320 arranged at the frame 310. Each test assembly 320 includes a conductive metal member 321 capable of contacting the surface to be tested of the cell 400 and a connecting assembly 322 connecting the two ends of the conductive metal member 321 to the frame 310. The tightness between the connecting assembly 322 and the frame 310 is adjustable, so that the tightness of each conductive metal member 321 and the distance between two adjacent conductive metal members 321 are adjustable.
[0022] Specifically, the test device 100 of the present embodiment may include a base 200 and a measuring device 300, the measuring device 300 may include a frame 310 and at least one test component 320, the test component 320 may include a conductive metal part 321 and a connecting component 322, the tightness between the connecting component 322 and the frame 310 is adjustable, so that the distance between two adjacent metal strips is adjustable, thereby enabling the measuring device 300 to adapt to battery cells 400 with different grid lines, thereby increasing the scope of application. 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 part 321 connected to each connecting component 322 is adjustable, thereby avoiding poor contact between the conductive metal part 321 and the component to be tested due to being too loose, and also avoiding the conductive metal part 321 being too tight, resulting in the breakage of the conductive metal part 321 or the hidden cracks or fragments of the component to be tested (battery cell).
[0023] Specifically, the conductive metal part 321 of the present embodiment can be a metal wire or a metal strip. Specifically, the conductive metal part 321 of the present 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 has a certain flexibility. The conductive metal part 321 in the entire measuring device 300 is flexible. In the present embodiment, if the conductive metal part 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 part 321 can fully contact the grid line of the battery cell 400, solve the contact problem caused by the linear structure, avoid poor stability during the test process, and improve the detection accuracy.
[0024] As a specific embodiment of the present invention, Figure 3-Figure 5 As shown, two fixing members 311 arranged opposite to each other are disposed at the frame 310. Each fixing member 311 is provided with at least one first through hole 312 extending in a direction perpendicular to the conductive metal member 321.
[0025] Specifically, both ends of each conductive metal member 321 of the present embodiment are connected to a connecting component 322, and each connecting component 322 may include a first connecting member 3221 and a second connecting member 3222. The first connecting member 3221 passes through the first through hole 312 and is connected to the fixing member 311 through the second connecting member 3222. The tightness of the conductive metal member 321 can be adjusted by the relative position between the second connecting member 3222 and the first connecting member 3221, and the distance between the two conductive metal members 321 can be adjusted after loosening the first connecting member 3221 and the second connecting member 3222.
[0026] Specifically, the first connecting member 3221 of the present embodiment may be a bolt, and the second connecting member 3222 may be a nut, and there may be two nuts. The bolt passes through the first through hole 312, one end is connected to the conductive metal member 321, and the other end has an external thread, which cooperates with the nut through the external thread, and the tightness is adjusted by screwing the two nuts. When the two nuts are screwed to loosen the nut and the fixing member 311, the position of the bolt at the first through hole 312 can be adjusted, and then the distance between the conductive metal members 321 can be adjusted. When the two nuts are screwed, the position of the bolt relative to the fixing member 311 in the axial direction can also be adjusted, and then the tightness of the conductive metal member 321 can be adjusted.
[0027] As a specific embodiment of the present invention, a second through hole 313 parallel to the first through hole 312 is further provided at the fixing member 311 of this embodiment, and the first connecting member 3221 passes through the second through hole 313 and then passes through the first through hole 312 to be fastened to the fixing member 311, wherein the cross-section of the first connecting member 3221 at the point where it passes through the second through hole 313 is square to prevent the first connecting member 3221 from rotating relative to the fixing member 311.
[0028] Specifically, the first connecting member 3221 of this embodiment passes through the second through hole 313, and the cross-section of the first connecting member 3221 is square, and its size matches the size of the second through hole 313, so that when the second connecting member 3222 and the first connecting member 3221 are rotated and screwed, the first connecting member 3221 will not rotate relative to the fixing member 311.
[0029] Specifically, the first through hole 312 , the second through hole 313 and the conductive metal member 321 of this embodiment are located in the same plane.
[0030] As a specific embodiment of the present invention, each connecting component 322 of this embodiment can also include a tension spring 3223 and an eight-shaped buckle 3224 connected in sequence, the tension spring 3223 is connected to the first connecting member 3221 in the connecting component 322, and the eight-shaped buckle 3224 is connected to the conductive metal member 321.
[0031] Specifically, the connecting component 322 of this embodiment may include a tension spring 3223, which connects the conductive metal part 321 and the first connecting part 3221. The tension spring 3223 can ensure that the two ends of the conductive metal part 321 have a certain elastic force when connected to the fixing part 311, thereby tensioning the conductive metal part 321 and avoiding hidden cracks or damage to the battery cell 400 when testing the battery cell 400.
[0032] As a specific embodiment of the present invention, the number of the test components 320 in this embodiment is multiple, and the multiple test components 320 are arranged in parallel and at intervals.
[0033] As a specific embodiment of the present invention, Figure 6-Figure 8 As shown, the base 200 of this embodiment may include at least one adjustment rail 210 and at least one support member 220. Each adjustment rail 210 is provided with at least one third through hole 211 extending in a direction perpendicular to the conductive metal member 321. Each support member 220 is parallel to the conductive metal member 321. Each support member 220 is placed on the adjustment rail 210, and the support member 220 is detachably connected to the adjustment rail 210 by passing through the third through hole 211 with a fastener.
[0034] Specifically, Figure 8 and Fig. 9 As shown, in this embodiment, a support member 220 is arranged on the adjustment rail 210, and a third through hole 211 is arranged on the adjustment rail 210. A corresponding threaded hole 223 is arranged at the bottom of the support member, and after the fastener passes through the third through hole 211, the support member 220 is arranged at the adjustment rail 210 through the threaded hole 223. The tightness between the support member 220 and the adjustment rail 210 can be adjusted by adjusting the tightness of the fastener, and then the distance between the support member 220 can be adjusted when the distance between the support member 220 and the adjustment rail 210 is relatively loose, and the support member 220 is tightened after reaching the target position.
[0035] Specifically, the support member 220 of this embodiment may be a copper busbar.
[0036] Specifically, the number of the support members 220 in this embodiment is the same as the number of the conductive metal members 321 , and when the measuring device 300 measures the battery cell 400 , each support member 220 is disposed corresponding to one of the conductive metal members 321 .
[0037] Specifically, this embodiment utilizes the support member 220 to support the battery cell 400, and when the measuring device 300 measures the battery cell 400, the conductive metal member 321 presses the battery cell 400. At this time, the conductive metal member 321 is arranged corresponding to the support member 220, which not only ensures good contact, but also avoids the battery cell 400 from being cracked or damaged when the conductive metal member 321 presses the battery cell 400.
[0038] As a specific embodiment of the present invention, Fig.10 As shown, the upper surfaces 221 of the plurality of support members 220 of this embodiment jointly form a support surface 222 (eg, Figure 2 4 ) is used to support the battery cell 400. The upper surface 221 of each support member 220 is an arc-shaped structure, so that the support surface 222 is an arc-shaped surface.
[0039] Specifically, the upper surface of the support member 220 in this embodiment is formed as an arc surface, so that when the test component 320 tests the battery cell 400, in order to ensure better contact between the conductive metal part 321 and the battery cell 400, the height of the connecting components 322 at both ends can be slightly lower than the height of the upper surface 221 without touching the support member 220.
[0040] Specifically, the upper surface 221 of the support member 220 of this embodiment forms 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 has an arc transition. In this way, when the battery cell 400 is placed on the support surface 222, the middle of the battery cell 400 is supported slightly higher than the two sides, thereby making the conductive metal member 321 better in contact with the battery cell 400.
[0041] As a specific embodiment of the present invention, Figure 6 As shown, the testing device 100 of this embodiment may further include at least one adjustment auxiliary block 230, which is disposed at the end of the side of the support member 220. Each adjustment auxiliary block 230 may include at least one positioning protrusion (not shown in the figure), so as to adjust the distance between two adjacent support members 220 by cooperating with the positioning protrusion and the support member 220.
[0042] Specifically, the number of the adjustment auxiliary blocks 230 of this embodiment can be two, which are respectively arranged at the two ends of the side of each support member 220. The size of the positioning protrusion on each adjustment auxiliary block 230 can be set in advance, and the positioning protrusion can be clamped between the support members 220, and the distance between the support members 220 is limited by the size of the positioning protrusion.
[0043] Specifically, it is first necessary to loosen the support member 220 and the adjustment guide rail 210 by screwing the fasteners, and then clamp the pre-customized adjustment auxiliary block 230 and the support member 220 together, so that a positioning protrusion is clamped between two adjacent support members 220. After the adjustment is completed, the support member 220 and the adjustment guide rail 210 are tightened by screwing the fasteners.
[0044] As a specific embodiment of the present invention, Figure 6 and Figure 7 As shown, the base 200 of this embodiment may further include a fixing plate 240 and a needle clamping plate 250. The fixing plate 240 is disposed below the adjusting rail 210 and is used to support the adjusting rail 210. The needle clamping plate 250 is disposed below the fixing plate 240 and is used to support the fixing plate 240. Two parallel guide grooves 251 are disposed at the needle clamping plate 250. The extending direction of the guide grooves 251 is perpendicular to the plane where the support member 220 is located. The fixing plate 240 can slide along the guide grooves 251 and be fastened by fasteners after reaching a preset position.
[0045] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.
Claims
1. A solar cell testing device, used to test the electrical performance of a solar cell, characterized in that: include: A base, used for supporting the battery cell; and A measuring device is located above the base and has an adjustable relative position to the base, the measuring device includes a frame and at least one test component arranged on the frame, each of the test components includes a conductive metal piece capable of contacting the surface to be tested of the battery cell and a connecting component connecting both ends of the conductive metal piece to the frame, the tightness between the connecting component and the frame is adjustable, thereby making the tightness of each conductive metal piece and the distance between two adjacent conductive metal pieces adjustable.
2. The solar cell testing device according to claim 1, characterized in that: The frame is provided with two fixing members arranged opposite to each other; each of the fixing members is provided with at least one first through hole extending in a direction perpendicular to the conductive metal member; Each of the connecting components includes a first connecting member and a second connecting member. The first connecting member passes through the first through hole and is connected to the fixing member through the second connecting member. The tightness of the conductive metal member is adjusted by the relative position between the second connecting member and the first connecting member, and the distance between the two conductive metal members is adjusted after loosening the first connecting member and the second connecting member.
3. The solar cell testing device according to claim 2, characterized in that: The fixing member is also provided with a second through hole parallel to the first through hole. The first connecting member passes through the second through hole and then passes through the first through hole to be fastened to the fixing member, wherein the cross-section of the first connecting member at the point where it passes through the second through hole is square to prevent the first connecting member from rotating relative to the fixing member.
4. The solar cell testing device according to claim 3, characterized in that: The first through hole, the second through hole and the conductive metal member are located in the same plane.
5. The solar cell testing device according to any one of claims 2 to 4, characterized in that: Each of the connecting components further includes a tension spring, which connects the conductive metal member and the first connecting member.
6. The solar cell testing device according to any one of claims 1 to 4, characterized in that: The base comprises: At least one adjusting rail, each of the adjusting rails being provided with at least one third through hole extending in a direction perpendicular to the conductive metal member; At least one support member, each of which is parallel to the conductive metal member; each of which is placed on the adjustment rail, and is detachably connected to the adjustment rail by fasteners passing through the third through hole.
7. The solar cell testing device according to claim 6, characterized in that: The number of the support members is the same as the number of the conductive metal members, and when the measuring device measures the battery cell, each of the support members is arranged corresponding to one of the conductive metal members.
8. The solar cell testing device according to claim 6, characterized in that: The upper surfaces of the plurality of support members together form a support surface for supporting the battery cell; and the upper surface of each support member is an arc-shaped structure, so that the support surface is an arc-shaped surface.
9. The solar cell testing device according to claim 6, characterized in that: It also includes at least one adjustment auxiliary block, each of which includes at least one positioning protrusion, so that the distance between two adjacent support members can be adjusted by cooperating between the positioning protrusion and the support member.
10. The solar cell testing device according to claim 6, characterized in that: The base also includes: A fixing plate, disposed below the adjusting guide rail, and used for supporting the adjusting guide rail; The needle closing plate is arranged under the fixed plate and is used to support the fixed plate. Two parallel guide grooves are arranged on the needle closing 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 be fastened with fasteners after reaching the preset position.