Photovoltaic cell testing device

Abstract

The utility model provides a photovoltaic cell testing device, which comprises a detection mechanism, and is characterized in that the detection mechanism comprises a flexible circuit board and a probe; one end of the probe is arranged on the flexible circuit board; the other end of the probe protrudes out of the plane where the flexible circuit board is located and is used for making contact with a test point of a battery piece to be tested and obtaining electrical parameters. The mode of combining the probe and the flexible circuit board is adopted, the position and the angle of the probe are easy to adjust, the probe can be conveniently aligned and contacted with a battery piece, the device structure is simplified, the probe can be conveniently replaced, and therefore the problems that an existing IV testing device is complex in structure, inconvenient to replace, high in cost and difficult to align and adjust are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cell testing, and in particular to a photovoltaic cell testing device. Background Art

[0002] When conducting IV performance tests on photovoltaic cells, the number of probe rows required needs to be determined based on the arrangement of the test points on the cell. Each probe row has the same number of mutually insulated current and voltage probes. The above test method requires precise alignment of the probe rows and the test points of the cell.

[0003] Each needle of the probe row in the existing IV test device is equipped with a spring, which has a complex structure, is inconvenient to replace, has a high cost, and is difficult to adjust the position. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide a photovoltaic cell testing device to solve the problems of the existing IV testing device having a complex structure, inconvenient replacement, high cost, and difficult alignment adjustment.

[0005] In order to solve the above problems, the present application is implemented through the following technical solutions:

[0006] The present application proposes a photovoltaic cell testing device, which includes a detection mechanism, which includes a flexible circuit board and a probe; one end of the probe is arranged on the flexible circuit board; the other end of the probe protrudes from the plane where the flexible circuit board is located, and is used to contact the test point of the cell to be tested and obtain electrical parameters.

[0007] Optionally, in the testing device, the probe is perpendicular to the plane where the flexible circuit board is located.

[0008] Optionally, in the test device, the detection mechanism includes at least two flexible circuit boards, each of the flexible circuit boards is provided with a probe row, and each of the probe rows includes a plurality of the probes arranged side by side and at intervals.

[0009] Optionally, in the test device, the distance between adjacent probes in the same probe row is 0.5 to 1.5 mm; and / or

[0010] The distance between adjacent probe rows is 8-12 mm.

[0011] Optionally, in the testing device, the detection mechanism also includes a probe fixing plate, an elastic rubber pad and a cover plate, the cover plate is covered on the probe fixing plate, a accommodating cavity is formed between the cover plate and the probe fixing plate, the elastic rubber pad is filled in the accommodating cavity, the flexible circuit board is arranged between the elastic rubber pad and the probe fixing plate, and a first through hole for the probe to pass through is provided on the probe fixing plate.

[0012] Optionally, in the testing device, a hollow structure is provided in the elastic rubber pad.

[0013] Optionally, in the testing device, the hollow structure is provided in a first area of ​​the elastic rubber pad, and the first area is a projection area of ​​the probe on the elastic rubber pad.

[0014] Optionally, in the test device, the test device further comprises a lifting mechanism, the detection mechanism is connected to the lifting mechanism, and the lifting mechanism is used to drive the detection mechanism to contact or separate from the test point of the battery cell.

[0015] Optionally, in the testing device, a side of the cover plate facing away from the probe fixing plate is connected to the lifting mechanism via a spring.

[0016] Optionally, in the test device, a guide rod is vertically arranged on the side of the cover plate facing away from the probe fixing plate, a second through hole is arranged on the lifting mechanism, the guide rod is gap-matched with the second through hole, and the spring is sleeved on the guide rod.

[0017] Optionally, the testing device further comprises a light source and a carrying mechanism, wherein the carrying mechanism is used to carry the battery cell, and the light source is used to provide testing light to the battery cell;

[0018] The supporting mechanism is arranged between the light source and the detecting mechanism, and the testing light can pass through the supporting mechanism to reach the light receiving surface of the battery sheet.

[0019] Optionally, in the testing device, the supporting mechanism includes a table panel, a transparent supporting area and at least two baffles, the transparent supporting area is arranged in the middle of the table panel, and the surface of the transparent supporting area is flush with the table panel, and at least two baffles are arranged around the supporting area on the table panel and are used to limit the battery cell.

[0020] Compared with the prior art, this application has the following advantages:

[0021] The photovoltaic cell testing device in the present application includes a detection mechanism; the detection mechanism includes a flexible circuit board and a probe; one end of the probe is arranged on the flexible circuit board; the other end of the probe protrudes from the plane where the flexible circuit board is located, and is used to contact the test point of the battery cell and obtain electrical parameters; wherein, the combination of the probe and the flexible circuit board is adopted, which not only facilitates the adjustment of the position and angle of the probe and facilitates the alignment and contact with the battery cell, but also simplifies the device structure, reduces the cost, and facilitates the replacement of the probe, thereby effectively improving the problems of the existing IV testing device, such as complex structure, inconvenient replacement, high cost, and difficult alignment adjustment.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A perspective view of a photovoltaic cell IV test device provided by an embodiment of the present application;

[0024] Figure 2 A side view of a photovoltaic cell IV test device provided in an embodiment of the present application;

[0025] Figure 3 This is a first angle schematic diagram of the detection mechanism in the embodiment of the present application;

[0026] Figure 4 A second angle schematic diagram of the detection mechanism in the embodiment of the present application;

[0027] Figure 5 This is a schematic diagram of the structure of the elastic rubber pad in the embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the combination of the probe and the flexible circuit board in the embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] Since the arrangement of the test points corresponds to the arrangement of the main grid lines or pad columns, in the prior art, when performing IV testing on a battery cell, it is necessary to determine the number of required test rows based on the arrangement of the test points, for example, based on the arrangement of the main grid lines or pad columns, and each test row has the same number of current needles and voltage needles that are insulated from each other. The above-mentioned test method has high requirements for the alignment of each probe row and the test point. In the existing test device, each needle of the probe row is equipped with a spring, which has a complex structure, is inconvenient to replace, has a high cost, and is difficult to adjust the alignment. It should be noted that the above-mentioned pad column refers to a plurality of pads arranged perpendicular to the direction of the fine grid lines.

[0032] In view of the above problems, an embodiment of the present application provides a photovoltaic cell testing device, which is described below by taking an IV testing device 100 as an example. Figures 1 to 6 As shown, it includes a detection mechanism 30, and the detection mechanism 30 includes a flexible circuit board 31 and a probe 38; one end of the probe 38 is arranged on the flexible circuit board 31; the other end of the probe 38 protrudes from the plane where the flexible circuit board 31 is located, and is used to contact the test point of the battery cell 50 and obtain electrical parameters. Specifically, the electrical parameter can be a current parameter or a voltage parameter, as well as other electrical parameters. It should be noted that the battery cell 50 to be tested can be a back-contact photovoltaic battery cell 50, but it is not limited to this, and it can also be used for other types of photovoltaic batteries 50. The specific implementation of the photovoltaic cell IV test device 100 can be, for example: manually or automatically placing the battery cell 50 to be tested on the carrying mechanism 20, starting the light source 10 so that the light source 10 irradiates the light-receiving surface of the photovoltaic battery cell 50, and the detection mechanism 30 moves until the probe 38 is in close contact with the battery cell 50, ensuring the accuracy of the test and improving the reliability and stability of the test. The above is only an example, but it is not limited to this.

[0033] Among them, the probe 38 is combined with the flexible circuit board 31, and the flexible circuit board 31 can be freely bent, rolled, and folded to achieve arbitrary movement and extension in three-dimensional space. The probe 38 is set on the above-mentioned flexible circuit board 31, which not only facilitates the adjustment of the position or angle of the probe 38 to align and contact with the battery cell 50, but also simplifies the device structure (no need to set a spring for each probe), and facilitates the replacement of the probe 38, thereby effectively improving the existing IV testing device 100 The problem of complex structure, inconvenient replacement, high cost, and difficult alignment adjustment.

[0034] In the present application embodiment, Figure 6 As shown, one end of the probe 38 is arranged on the flexible circuit board 31, and the other end of the probe 38 protrudes from the plane where the flexible circuit board 31 is located, that is, the probe 38 is combined with the flexible circuit board 31 in an angled state, so that the probe 38 can contact the test point of the battery cell 50.

[0035] Optionally, in one embodiment, the probe 38 is perpendicular to the plane of the flexible circuit board 31, which is not only conducive to electrical lap measurement, but also can improve the pressure bearing performance of the probe 38, thereby increasing its service life. Specifically, the probe 38 can be a copper needle.

[0036] In the embodiment of the present application, the detection mechanism 30 includes at least two flexible circuit boards 31, each of which is provided with a probe row 32, and each of which includes a plurality of probes 38 arranged side by side and at intervals. Figure 6 As shown, a plurality of probes 38 are fixed in groups on a flexible copper foil 311 to form a probe row 32. The flexible copper foil 311 is bonded to a base layer 312 by an adhesive, for example, and a line 313 is connected at the top. The base layer 312 is an insulating layer formed with polyimide or polyester film as a substrate.

[0037] In an embodiment of the present application, the above-mentioned probe row 32 includes a positive probe row 321 and a negative probe row 322, which respectively contact the positive test point and the negative test point on the battery cell 50. The above-mentioned positive test point can be a test point on the positive grid line or the positive welding pad, and the above-mentioned negative test point can be a test point on the negative grid line or the negative welding pad.

[0038] Because the flexible circuit board 31 has good stretching performance, each probe 38 no longer needs to be equipped with a spring, and the spacing between the probes 38 and the spacing between the probe rows 32 can be set smaller, so that more probes 38 and probe rows 32 can be arranged to match more test points, thereby improving the compatibility of the detection mechanism 30, for example, it can be compatible with the test of non-main-grid cells with denser test points. In practical applications, the flexible circuit board 31 is stretched to achieve precise contact between the probe 38 and the test point of the cell 50.

[0039] Optionally, in one embodiment, the distance between adjacent probes 38 in the same probe row 32 is 0.5-1.5 mm, for example, it can be one of 0.5 mm, 1 mm, 1.5 mm or any two of the range values. Optionally, in one embodiment, the distance between adjacent probe rows 32 is 8-12 mm, for example, it can be one of 8 mm, 10 mm, 11 mm or any two of the range values. By adopting the above embodiment, the test of busbar-free cells with denser test points can be achieved.

[0040] In the embodiment of the present application, the detection mechanism 30 also includes a probe fixing plate 33, an elastic rubber pad 34 and a cover plate 35. The cover plate 35 is covered on the probe fixing plate 33. A accommodating cavity (not shown) is formed between the cover plate 35 and the probe fixing plate 33. The elastic rubber pad 34 is filled in the accommodating cavity. The flexible circuit board 31 is arranged between the elastic rubber pad 34 and the probe fixing plate 33, and a first through hole 331 for the probe 38 to pass through is provided on the probe fixing plate 33, so that the flexible circuit board 31 and the probe 38 are flexibly squeezed and fixed on the probe fixing plate 33 by using the elastic rubber pad 34.

[0041] The first through holes 331 on the probe fixing plate 33 are integrally formed by CNC machining, and have high precision, so as to better meet the contact requirements of the test points when performing IV testing on the battery cell 50 .

[0042] The ends of the probes 38 protruding from the plane of the flexible circuit board 31 can be set to semicircular, needle-shaped or other shapes, which is convenient for predicting point contact and aligning and passing through the first through hole 331 during installation.

[0043] The accommodating cavity may be a rectangular parallelepiped structure, and the shape of the elastic rubber pad 34 matches the accommodating cavity and is also a rectangular parallelepiped structure.

[0044] Optionally, in one embodiment, Figure 3 , 5 As shown, a hollow structure 341 is provided in the elastic rubber pad 34. The elastic rubber pad 34 itself is made of elastic material, and the hollow structure 341 provided in the elastic rubber pad 34 can further provide deformation space, improve the buffering effect, and enable the probe 38 to form a reliable and close contact with the test point of the battery cell 50, so as to achieve more reliable, stable and accurate measurement.

[0045] Optionally, in a specific embodiment, the first area of ​​the elastic rubber pad 34 is provided with the hollow structure 341, and the first area is the projection area of ​​the probe 38 on the elastic rubber pad 34, that is, the hollow structure is only provided at a position opposite to the probe 38 on the elastic rubber pad 34, which can further provide deformation space for the telescopic activity of the probe 38 while maintaining the overall structural strength of the elastic rubber pad 34.

[0046] In an embodiment of the present application, the above-mentioned testing device 100 also includes a lifting mechanism 40, and the detection mechanism 30 is connected to the lifting mechanism 40. The lifting mechanism 40 is used to drive the detection mechanism 30 to contact or separate from the test point of the battery cell 50, thereby realizing automatic control of the detection mechanism 30 to perform alignment test on the battery cell 50.

[0047] In the embodiment of the present application, the testing device further includes a light source 10 and a carrying mechanism 20 . The carrying mechanism 20 is used to carry the battery cell 50 to be tested, and the light source 10 is used to provide testing light to the battery cell 50 .

[0048] Optionally, the testing device 100 further includes an outer frame 60 , and the light source 10 , the supporting mechanism 20 , the detecting mechanism 30 and the lifting mechanism 40 are all disposed in the outer frame 60 .

[0049] In the embodiment of the present application, the outer frame 60 is formed by sequentially connecting a bottom plate 61 , a column 62 and a top plate 63 , and the supporting mechanism 20 is mounted on the bottom plate 61 via a supporting rod 24 .

[0050] Optionally, in one embodiment, a light source seat 11 is provided on the bottom plate 61, the light source 10 is provided on the light source seat 11, the supporting mechanism 20 is provided between the light source 10 and the detection mechanism 30, and the side of the supporting mechanism 20 facing away from the light source 10 is used to support the battery cell 50, so that the light source 10, the battery cell 50 and the detection mechanism 30 are arranged from bottom to top, and the direction of the test light emitted by the light source 10 is upward. In this embodiment, the lifting mechanism 40 can be provided on the top plate 63 of the outer frame 60. It should be noted that in this embodiment, taking the back-contact battery cell as an example, when the back-contact battery cell is placed on the supporting mechanism 20, the light-receiving surface of the back-contact battery cell faces downward, so that the light-receiving surface of the back-contact battery cell faces the light source 10.

[0051] Optionally, in another embodiment, a light source seat 11 is provided on the top plate 63, the light source 10 is provided on the light source seat 11, the supporting mechanism 20 is provided between the light source 10 and the detection mechanism 30, and the side of the supporting mechanism 20 facing away from the light source 10 is used to adsorb the battery cell 50, so that the light source 10, the battery cell 50 and the detection mechanism 30 are arranged from top to bottom, and the test light emitted by the light source 10 is directed downward. In this embodiment, the lifting mechanism 40 can be provided on the bottom plate 61 of the outer frame 60. It should be noted that in this embodiment, taking the back-contact battery cell as an example, when the back-contact battery cell is adsorbed on the supporting mechanism 20, the light-receiving surface of the back-contact battery cell faces upward, so that the light-receiving surface of the back-contact battery cell faces the light source 10.

[0052] Optionally, in one embodiment, the side of the cover plate 35 facing away from the probe fixing plate 33 is connected to the lifting mechanism 40 through a spring 36, which can buffer and absorb energy of the lifting mechanism 40 when the lifting mechanism 40 has excessive stroke, thereby ensuring that each probe 38 can stably contact the test point of the battery cell 50 and preventing problems such as battery cell cracking caused by excessive contact stress between the two.

[0053] Optionally, in one embodiment, Figure 3As shown, the lifting mechanism 40 includes a cylinder 41 and a cylinder fixing plate 42. The outer shell of the cylinder 41 is fixed on the outer frame 60. The cylinder fixing plate 42 is arranged at the output end of the cylinder 41. The side of the cover plate 35 away from the probe fixing plate 33 is connected to the cylinder fixing plate 42 through a spring 36.

[0054] Optionally, in a specific embodiment, a guide rod 37 is vertically arranged on the side of the cover plate 35 facing away from the probe fixing plate 33, and a second through hole 421 is arranged on the lifting mechanism 40, and the guide rod 37 and the second through hole 421 are clearance-matched, that is, the guide rod 37 can slide along the second through hole 421, and the spring 36 is sleeved on the guide rod 37, so that the spring 36 can smoothly expand and contract under the clearance fit of the guide rod 37 and the second through hole 421, thereby driving the detection mechanism 30 to be smoothly lifted or lowered relative to the lifting mechanism 40.

[0055] Optionally, in a specific embodiment, the above-mentioned supporting mechanism 20 is arranged between the light source 10 and the detection mechanism 30, and the test light can pass through the supporting mechanism 20 to reach the light-receiving surface of the battery cell 50, and the detection mechanism 30 is located on the side of the battery cell 50 away from the light source 10, so that the testing device 100 is suitable for testing back-contact solar cells.

[0056] Optionally, in a specific embodiment, the above-mentioned bearing mechanism 20 includes a table panel 21, a transparent bearing area 22 and at least two baffles 23, wherein the transparent bearing area 22 is arranged in the middle of the table panel 21, and the surface of the transparent bearing area 22 is flush with the table panel 21, and at least two baffles 23 are arranged on the table panel 21 and used to limit the position of the battery cell 50. In this specific embodiment, by arranging the transparent bearing area 22 for placing the battery cell 50 in the middle of the table panel 21, the test light emitted by the light source 10 can pass through the transparent bearing area 22 from the back to reach the light-receiving surface of the battery cell 50; and by using at least two baffles 23, the battery cell 50 can be accurately limited to the transparent bearing area 22, so that the detection mechanism 30 can be accurately docked for testing; and the surface of the transparent bearing area 22 is flush with the table panel 21, so that it is convenient to remove the battery cell 50 after the test is completed.

[0057] Optionally, the transparent carrying area 22 may be made of transparent quartz or other light-transmitting materials.

[0058] Optionally, at least two baffles 23 include two parallel first baffles 231 and a second baffle 232 perpendicular to the first baffle 231. The second baffle 232 can be set in the above-mentioned transparent supporting area 22, so that the first baffle 231 and the second baffle 232 enclose a limiting area for placing the battery cell 50.

[0059] Optionally, the distance between the two first blocking bars 231 is adjustable, that is, the first blocking bars 231 are movably disposed on the table panel 21 to adapt to battery cells 50 of different sizes.

[0060] When the test device 100 of the present application is used for testing, the battery cell 50 is placed on the table panel 21, and the first stop bar 231 and the second stop bar 232 are used to limit the position, and then the light source 10 is started to control the cylinder 41 to drive the probe 38 to move and contact the battery cell 50, and then continue to move the preset stroke, so as to use the multi-level buffer of the flexible circuit board 31, the elastic rubber pad 34 and the spring 36 to absorb the preset stroke buffer, and ensure that each probe 38 forms a reliable and stable contact with the test point of the battery cell 50; in addition, the probe 38 is set on the flexible circuit board 31, which is convenient for adjusting the position or angle of the probe 38 to align with the battery cell 50 to ensure the accuracy of the test. The preset stroke can be 1mm.

[0061] In summary, in this embodiment, the detection mechanism 30 in the test device 100 in the present application includes a flexible circuit board 31 and a probe 38; one end of the probe 38 is arranged on the flexible circuit board 31; the other end of the probe 38 protrudes from the plane where the flexible circuit board 31 is located, and is used to contact the test point of the battery cell 50 to be tested and obtain electrical parameters (such as current parameters or voltage parameters); wherein, the combination of the probe 38 and the flexible circuit board 31 not only realizes that the position and angle of the probe 38 are easy to adjust, and it is convenient to align and contact with the battery cell 50, but also simplifies the device structure (no need to set a spring for each probe), and facilitates the replacement of the probe 38, thereby effectively improving the problems of the existing IV test device 100, such as complex structure, inconvenient replacement, high cost, and difficult alignment adjustment.

[0062] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0064] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0065] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A photovoltaic cell testing device, characterized in that: The invention comprises a detection mechanism, which comprises a flexible circuit board and a probe; one end of the probe is arranged on the flexible circuit board; the other end of the probe protrudes from the plane where the flexible circuit board is located, and is used to contact the test point of the battery cell to be tested and obtain electrical parameters.

2. The testing device according to claim 1, characterized in that: The probe is perpendicular to the plane where the flexible circuit board is located.

3. The testing device according to claim 1, characterized in that: The detection mechanism includes at least two flexible circuit boards, each of which is provided with a probe row, and each of which includes a plurality of probes arranged side by side and at intervals.

4. The testing device according to claim 3, characterized in that: The distance between adjacent probes in the same probe row is 0.5 to 1.5 mm; and / or The distance between adjacent probe rows is 8-12 mm.

5. The testing device according to claim 1, characterized in that: The detection mechanism also includes a probe fixing plate, an elastic rubber pad and a cover plate, wherein the cover plate is arranged on the probe fixing plate, a receiving cavity is formed between the cover plate and the probe fixing plate, the elastic rubber pad is filled in the receiving cavity, the flexible circuit board is arranged between the elastic rubber pad and the probe fixing plate, and a first through hole for the probe to pass through is arranged on the probe fixing plate.

6. The testing device according to claim 5, characterized in that: A hollow structure is arranged in the elastic rubber pad.

7. The testing device according to claim 6, characterized in that: The hollow structure is disposed in a first area of ​​the elastic rubber pad, and the first area is a projection area of ​​the probe on the elastic rubber pad.

8. The testing device according to claim 5, characterized in that: The testing device further comprises a lifting mechanism, the detection mechanism is connected to the lifting mechanism, and the lifting mechanism is used to drive the detection mechanism to contact or separate from the test point of the battery cell.

9. The testing device according to claim 8, characterized in that: The side of the cover plate facing away from the probe fixing plate is connected to the lifting mechanism through a spring.

10. The testing device according to claim 9, characterized in that: A guide rod is vertically arranged on one side of the cover plate away from the probe fixing plate, a second through hole is arranged on the lifting mechanism, the guide rod is in clearance fit with the second through hole, and the spring is sleeved on the guide rod.

11. The testing device according to any one of claims 1 to 10, characterized in that: The testing device further comprises a light source and a carrying mechanism, wherein the carrying mechanism is used to carry the battery cell, and the light source is used to provide testing light to the battery cell; The supporting mechanism is arranged between the light source and the detecting mechanism, and the testing light can pass through the supporting mechanism to reach the light receiving surface of the battery sheet.

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