Flexible photovoltaic module bending test device and method

Abstract

The invention discloses a bending test device and method for a flexible photovoltaic module. The device specifically comprises a cylinder body and an expansion piece. A mounting plane for mounting a flexible photovoltaic module is formed on the outer surface of the barrel, and an accommodating space is formed in the barrel; the expansion piece is arranged in the containing space and used for enabling the barrel to deform through expansion so as to change the curvature of the outer surface of the barrel. Compared with the prior art, the height of the tested curvature is controllable. Meanwhile, when the curvature radius is dynamically adjusted, the radius of the cylinder is not fixed, so that the cylinder can be matched with various flexible assemblies, and the adaptability of the testing device is improved. The arrangement of the strain gauge and the curvature sensor further makes the curvature change of the cylinder uniform, the curvature can be fed back in real time, and the accuracy of the test and the real-time performance of the test result are ensured. In addition, the structure of the expansion piece is improved, local curvature compensation is carried out on the cylinder body in cooperation with the curvature sensor, and the testing precision is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic module detection, and particularly relates to a bending test device and method for flexible photovoltaic modules. Background Art

[0002] Due to their light weight, bendability, and easy installation characteristics, flexible photovoltaic modules show broad application prospects in multiple fields, specifically including: Building Integrated Photovoltaics (BIPV): Flexible modules can be used as part of building facades, roofs, or windows to combine photovoltaic power generation with architectural aesthetics. Agricultural applications: Used in greenhouse sheds and irrigation systems to provide power support. Transportation facilities: Integrated on carports, ships, and the surfaces of vehicles to provide auxiliary energy for transportation. Outdoor and emergency power supplies: Suitable for scenarios such as outdoor travel, disaster relief, and charging of emergency equipment. Special environments: In extreme environments such as deserts, mountains, and polar regions, flexible modules can be used as ideal power solutions.

[0003] High-efficiency flexible modules do not use glass encapsulation. In addition to having high requirements for the load-bearing of the installation position, such modules often require a certain bending radius for the modules to pursue simplicity and beauty, while not reducing the power generation performance of the modules.

[0004] In the prior art, the accuracy of bending tests, the flexibility of equipment, and the adaptability of test methods all need to be improved urgently. There are no applicable methods and unified standards for how to perform bending tests on flexible modules and how to judge bending.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a bending test device and method for flexible photovoltaic modules.

[0006] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a bending test device and method for flexible photovoltaic modules, which can reduce the labor cost of testing and improve the accuracy and flexibility of bending tests for flexible photovoltaic modules.

[0008] To achieve the above purpose, the technical solutions provided by a specific embodiment of the present invention are as follows:

[0009] In a first aspect, the present invention provides a bending test device for flexible photovoltaic modules, which includes:

[0010] A cylinder body, on the outer surface of which there is formed an installation plane for placing the flexible photovoltaic module, and inside the cylinder body there is formed a receiving space;

[0011] An expansion member, which is disposed in the accommodation space and is used to cause the cylinder to deform by expansion so as to change the curvature of the outer surface of the cylinder.

[0012] In one or more embodiments of the present invention, a plurality of air holes communicating with the accommodation space are provided on the installation plane.

[0013] In one or more embodiments of the present invention, an auxiliary fitting layer is provided on the installation plane;

[0014] A curvature sensor and multiple groups of strain gauges are provided on the outer surface of the cylinder.

[0015] In one or more embodiments of the present invention, an opening is provided on the cylinder, and the opening extends from the upper end surface of the cylinder to the lower end surface of the cylinder.

[0016] In one or more embodiments of the present invention, the flexible photovoltaic module is fixedly installed on the installation plane based on a strap;

[0017] The installation plane is provided with a first strap limiting groove in a corresponding area on the upper end surface along the axial direction of the cylinder;

[0018] A second strap limiting groove matching with the first strap limiting groove is provided on the lower end surface of the cylinder.

[0019] In one or more embodiments of the present invention, a first limiting member and a second limiting member are correspondingly provided on both sides of the installation plane;

[0020] First limiting grooves and second limiting grooves for fixing the flexible photovoltaic module are provided on the opposite surfaces of the first limiting member and the second limiting member.

[0021] In one or more embodiments of the present invention, the expansion member includes a first expansion member for providing a basic expansion force and a second expansion member for compensating for the local curvature of the cylinder;

[0022] The second expansion member is disposed between the inner surface of the cylinder and the first expansion member.

[0023] In one or more embodiments of the present invention, the second expansion member is a regular polygon airbag, and a plurality of the second expansion members are densely paved on the inner surface of the cylinder.

[0024] Second, the present invention provides a method for testing the bending of a flexible photovoltaic module. Applying the flexible photovoltaic module bending test device, it is characterized in that it includes:

[0025] Inject an expansion medium into the expansion member to cause the cylinder to reach a preset initial curvature under the extrusion of the expansion member;

[0026] Fix the flexible photovoltaic module on the installation plane of the cylinder body.

[0027] Gradually extract the expansion medium in the expansion member to deform the cylinder body to a preset test curvature.

[0028] Record the curvature of the cylinder body when cracks occur in the flexible photovoltaic module.

[0029] In one or more embodiments of the present invention, the method further includes:

[0030] Based on the air holes on the installation plane, evacuate the gas in the cavity between the flexible photovoltaic module and the installation plane to make the flexible photovoltaic module fit the installation plane.

[0031] Compared with the prior art, the flexible photovoltaic module bending test device and method provided by the present invention can quantify the curvature change of the test cylinder body as the injection amount of the expansion medium by setting the expansion member, and further realize highly controllable test curvature. At the same time, when dynamically adjusting the radius of curvature in the present invention, the radius of the cylinder is not fixed, so it can be matched with various flexible components, improving the adaptability of the test device. The setting of the strain gauge and the curvature sensor further makes the curvature change of the cylinder uniform, and the size of the curvature can be fed back in real time, ensuring the accuracy of the test and the timeliness of the test results. The present invention also improves the test accuracy by improving the structure of the expansion member and cooperating with the curvature sensor to perform local compensation of the curvature of the cylinder body. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 is a cross-sectional view perpendicular to the axial direction of the cylinder body of the flexible photovoltaic module bending test device in an embodiment of the present invention;

[0034] Figure 2 is a schematic flowchart of the flexible photovoltaic module bending test method in an embodiment of the present invention;

[0035] Figure 3 is a structural block diagram of the flexible photovoltaic module bending test system in an embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of the flexible photovoltaic module bending test device in an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of a bending test device for a flexible photovoltaic module in another embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of a first limiting member and a second limiting member in an embodiment of the present invention.

[0039] Description of main reference numerals:

[0040] 1 - Cylinder body, 11 - Auxiliary fitting layer, 12 - Curvature sensor, 13 - Strain gauge, 14 - Binding strap, 141 - First binding strap limiting groove, 142 - Second binding strap limiting groove, 15 - First limiting member, 151 - First limiting groove, 16 - Second limiting member, 161 - Second limiting groove, 2 - Expansion member, 3 - Outer surface of the cylinder body, 4 - Air hole, 5 - Opening. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0042] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0043] Embodiment 1:

[0044] Please refer to Figure 1 and Figure 4 . The bending test device for the flexible photovoltaic module specifically includes: a cylinder body 1 and an expansion member 2. An installation plane for placing the flexible photovoltaic module is formed on the outer surface 3 of the cylinder body 1, and a receiving space is formed inside the cylinder body 1; the expansion member 2 is arranged in the receiving space and is used to cause the cylinder body 1 to deform by expansion so as to change the curvature of the outer surface 3 of the cylinder body.

[0045] It should be noted that the expansion member 2 is used to cause the cylinder body 1 to deform uniformly by its own expansion, thereby changing the curvature of the outer surface 3 of the cylinder body. In the embodiments of the present invention, the material and form of the expansion member 2 are not limited, and it may include but is not limited to: airbag, shape memory polymer, photoinduced deformation material, etc. On the other hand, the expansion medium generally refers to a substance that can cause the expansion member 2 to expand, and it is matched with the selection of the expansion member 2, and can correspond to: gas, light change amount, temperature change amount, etc.

[0046] In contrast, the cylinder 1 needs to cause the curvature change of the battery under test through the change of its own curvature, so as to realize the test of the bending degree of the battery under test. Preferably, the material of the cylinder 1 should be a hard material and have a certain stretchability to meet the requirement that its curvature can be adjusted within a certain range. The specific material of the cylinder 1 in the embodiment of the present invention is not limited.

[0047] In this embodiment, the expansion member 2 can change its own volume based on injecting or extracting the expansion medium and apply pressure to the inner surface of the cylinder 1. Under the action of the pressure, the curvature at each point of the cylinder 1 changes. One or more groups of strain gauges 13 and curvature sensors 12 are arranged on the outer surface 3 of the cylinder. The strain gauges 13 are used to measure the stress magnitude at the corresponding position of the cylinder 1 at each moment, which helps to ensure that the cylinder 1 is always in a uniform deformation state during the test. The curvature sensor 12 can measure the curvature magnitude at the corresponding position of the cylinder 1 at each moment, which is convenient to confirm the maximum curvature value of the battery under test in time during the test. At the same time, it can visually judge the current curvature magnitude during the test, which is convenient to make targeted adjustments to the test process.

[0048] It should be noted that an opening 5 is provided on the cylinder 1 of the present invention, and the opening 5 extends from the upper end surface of the cylinder 1 to the lower end surface of the cylinder 1. The setting of the opening 5 can make the change of the curvature radius not restricted by the shape of a closed cylinder when the cylinder 1 deforms, and it can be applied to more application scenarios. At the same time, the setting of the opening 5 is beneficial to the loading, unloading and maintenance of the inner layer material.

[0049] Furthermore, when the battery under test is installed on the installation plane, it is expected that the battery under test can be in close contact with the installation plane to achieve synchronous curvature change. Based on this, optionally in this embodiment, an auxiliary fitting layer 11 is provided on the installation plane. The auxiliary fitting layer 11 covers the installation plane and is used to improve the fitting effect between the photovoltaic module under test and the installation plane.

[0050] It can be understood that the cylinder 1 is mostly made of hard materials, and it is difficult to achieve absolute smoothness on its surface during the processing. When placing the battery under test, air bubbles are likely to remain between it and the installation plane, resulting in incomplete fitting and affecting the test accuracy. In order to reduce the defect of the rough surface of the cylinder 1, the auxiliary fitting layer 11 preferably uses materials with a high friction coefficient, good flexibility, and shock absorption and temperature resistance, such as rubber, silica gel, foam materials, etc.

[0051] It should also be noted that in this embodiment, the battery cell to be tested is fixed to the installation plane based on the strap 14. Specifically, the installation plane is provided with a first strap limiting groove 141 in the corresponding area of the upper end face along the axial direction of the cylinder body 1; a second strap limiting groove 142 is provided on the lower end face of the cylinder body 1 and is matched with the first limiting groove 151. The first strap limiting groove 141 and the second strap limiting groove 142 can limit the strap 14 in the tangential direction of the end face of the cylinder body 1. Place the flexible photovoltaic module on the installation plane and tighten the strap 14. The strap 14 passes through the first strap limiting groove 141 and the second strap limiting groove 142 and winds around the inner wall of the cylinder body 1 to tighten; or both ends of the strap 14 are embedded in the first strap limiting groove 141 and the second strap limiting groove 142 and are tightened through a quick-release hook or a magnetic snap. In addition, convex points can be designed in the middle section of the strap 14 to bite and prevent slipping with the battery cell. Under the action of the strap 14, the flexible photovoltaic module is closely attached to the installation plane.

[0052] Further, air holes 4 communicating with the accommodation space are provided on the installation plane, and the air holes 4 sequentially penetrate through the auxiliary fitting layer 11 and the cylinder body 1. When the battery cell to be tested is arranged on the installation plane or the auxiliary fitting layer 11, the bubbles formed by the battery cell to be tested can be extracted based on the air holes 4, further improving the fitting degree between the battery cell and the installation plane.

[0053] Embodiment 2:

[0054] Referring to Figure 5 and Figure 6 As shown, the expansion member 2 in this embodiment can adopt the expansion member 2 in Embodiment 1, the difference being that in this embodiment, the structure for limiting the battery cell to be tested is different.

[0055] In this embodiment, on both sides of the installation plane, a first limiting member 15 and a second limiting member 16 are correspondingly provided; first limiting grooves 151 and second limiting grooves 161 for fixing the flexible photovoltaic module are provided on the opposite surfaces of the first limiting member 15 and the second limiting member 16. There is no need to provide the auxiliary fitting layer 11, the air holes 4, the first strap limiting groove 141, and the second strap limiting groove 142.

[0056] When placing the battery cell to be tested, the battery cell to be tested can be inserted into the first limiting groove 151 and the second limiting groove 161. The first limiting member 15 and the second limiting member 16 can be fixedly connected to the cylinder body 1 in a bonding, screwing, etc. manner, and the embodiments of the present invention do not limit this.

[0057] Embodiment 3:

[0058] The cylinder body 1 and the structures on the cylinder body 1 in this embodiment are the same as those in Embodiment 1 or Embodiment 2, the difference being the structure of the expansion member 2.

[0059] Specifically, in this embodiment, the expansion member 2 includes a first expansion member for providing a basic expansion force and a second expansion member for compensating for the local curvature of the cylinder 1; the second expansion member is disposed between the inner surface of the cylinder 1 and the first expansion member. The second expansion member may be a regular polygon airbag, and a plurality of second expansion members are closely paved on the inner surface of the cylinder 1. For example, the second expansion member is a regular hexagon airbag, and a plurality of second expansion members are closely paved in a honeycomb shape on the inner surface of the cylinder 1. Each second expansion member and the first expansion member adopt a separate medium transmission channel, so that the first expansion member and each second expansion member can be independently controlled.

[0060] Furthermore, in order to ensure that the basic expansion force provided by the first expansion member acts on the cylinder 1 as evenly as possible. The first expansion member is preferably arranged as a cylindrical airbag.

[0061] Please refer to Figure 2 As shown, it is a schematic flow chart of a method for bending test of a flexible photovoltaic module in an embodiment of the present invention. This method for bending test of a flexible photovoltaic module is applied to the above-mentioned device for bending test of a flexible photovoltaic module, and specifically includes the following steps:

[0062] S201: Inject an expansion medium into the expansion member 2 to make the cylinder 1 reach a preset initial curvature under the extrusion of the expansion member 2;

[0063] It can be understood that since the expansion member 2 and the cylinder 1 will both deform during the implementation of the bending test method of the present invention. Therefore, in order to ensure the smooth progress of the test, before starting the test, it is also necessary to confirm whether the cylinder 1 has cracks or deformations. Whether the air holes 4 for improving the fitting degree between the installation plane and the battery cell to be tested are unobstructed, whether the readings of the strain gauge 13 and the curvature sensor 12 are normal, whether the expansion member 2 can work properly, etc.

[0064] Furthermore, according to the test requirements of the user, a test environment with constant temperature and humidity, the initial curvature to be measured, and the maximum curvature (test curvature) that the cylinder 1 needs to reach during the test can be configured. Of course, a curvature change curve can also be set, and the curvature is made to change based on a preset curve by controlling the injection amount of the expansion medium.

[0065] Further, as described above, one or more sets of curvature sensors 12 and strain gauges 13 are provided on the outer surface 3 of the cylinder body of the flexible photovoltaic module bending test device provided by the present invention. During the bending test of the cylinder body 1, it is expected that the curvature changes uniformly, that is, the curvature and the amount of curvature change at each point of the cylinder body 1 are consistent. Therefore, an expansion medium can be preferentially filled into the first expansion member. When the curvature readings at each point are close to the expected value, the corresponding expansion medium is injected into a smaller expansion unit, the second expansion member, to achieve compensation for the curvature of the local cylinder body 1. When the curvature values corresponding to each point on the outer surface 3 of the cylinder body are within the preset error range, it is considered that the initialization of the test device is completed.

[0066] S202: Fix and install the flexible photovoltaic module on the installation plane of the cylinder body 1;

[0067] It can be understood that in the bending test, it is expected that the curvature change of the cylinder body 1 is consistent with the curvature change of the battery cell to be tested. This requires that the battery cell to be tested and the installation plane corresponding to the cylinder body 1 maintain a good synchronization relationship.

[0068] In an exemplary embodiment, the flexible photovoltaic module is fixedly installed on the installation plane based on the strap 14; a first strap limiting groove 141 is provided in the corresponding area of the upper end surface of the installation plane along the axial direction of the cylinder body 1; a second strap limiting groove 142 is provided on the lower end surface of the cylinder body 1 and is matched with the first limiting groove 151. The first strap limiting groove 141 and the second strap limiting groove 142 can limit the strap 14 in the tangential direction of the end surface of the cylinder body 1. Place the flexible photovoltaic module on the installation plane and tighten the strap 14. The strap 14 passes through the first strap limiting groove 141 and the second strap limiting groove 142 and winds around the inner wall of the cylinder body 1 to tighten; or both ends of the strap 14 are embedded in the first strap limiting groove 141 and the second strap limiting groove 142 and are tightened by a quick-release hook or a magnetic snap. In addition, convex points can be designed in the middle section of the strap 14 to bite and prevent slipping with the battery cell. Under the action of the strap 14, the flexible photovoltaic module is closely attached to the installation plane.

[0069] Particularly, in this embodiment, in order to further ensure the further fitting of the installation plane and the battery cell to be tested, an auxiliary fitting layer 11 can be provided on the installation plane. The auxiliary fitting layer 11 is used to improve the fitting effect between the photovoltaic module to be tested and the installation plane. The auxiliary fitting layer 11 preferably has materials with a high friction coefficient, good flexibility, and shock-absorbing and temperature-resistant properties, such as rubber, silica gel, foam materials, etc.

[0070] On the other hand, poor fitting is often due to the presence of air bubbles between the flexible photovoltaic module to be tested and the installation plane. Therefore, in the present invention, air holes 4 communicating with the accommodation space are provided on the installation plane. After fixing the flexible photovoltaic module to be tested on the installation plane, a negative pressure device can be used to extract the air between the flexible photovoltaic module to be tested and the installation plane through the reserved air holes 4.

[0071] It should be noted that in an embodiment of the present invention, the temperature distribution of the contact surface between the photovoltaic module and the cylinder 1 can be detected by using an infrared thermal imager to quantify the fitting degree of the contact surface between the two. Since the components in the tightly fitting area are in direct contact with the inner layer of the cylinder, heat is conducted through the solid and the temperature gradient is uniform; conversely, in the area with gaps, the air thermal resistance is much higher than that of solid contact, resulting in local high / low temperature areas. In this embodiment, in combination with the initialization means for the test scenario, the initialization of the temperature can be migrated to after this step. That is, first install the battery under test, and then adjust the ambient temperature to the preset test temperature. Based on this, on the one hand, the experimental cost does not need to be increased, and on the other hand, the fitting degree between the installation plane and the battery under test can be quantified and accurately determined for further adjustment based on experimental requirements.

[0072] It can be understood that although the above embodiment can achieve the tight fitting of the battery under test, it is necessary to introduce other external devices and at the same time open air holes 4 in the cylinder 1, increasing the processing difficulty. Therefore, the present invention also provides another embodiment. In this embodiment, a first limiting member 15 and a second limiting member 16 are correspondingly provided on both sides of the installation plane; first limiting grooves 151 and second limiting grooves 161 for fixing the flexible photovoltaic module are opened on the opposite surfaces of the first limiting member 15 and the second limiting member 16. The first limiting grooves 151 and the second limiting grooves 161 limit the flexible photovoltaic module under test to make the curvature of the flexible photovoltaic module consistent with the curvature of the cylinder 1.

[0073] S203: Gradually extract the expansion medium in the expansion member 2 to deform the cylinder 1 to a preset test curvature;

[0074] It can be understood that the expansion amplitude of the expansion member 2 is proportional to the amount of the expansion medium injected therein. After the bending test starts, by extracting the expansion medium in the expansion member 2, the cylinder 1 can be deformed, thereby increasing the curvature of the cylinder 1. Further, the curvature of the battery under test fixed on the installation plane will also change correspondingly with the curvature of the cylinder 1.

[0075] It should be noted that it is difficult to directly achieve the preset curvature of the cylinder 1 by extracting a large amount of expansion medium at one time in practical applications. First, this requires the use of materials that can adaptively deform for the material of the cylinder 1, such as shape memory alloys, etc., which makes the test cost too high. If conventional materials are used to make the cylinder 1, the sudden change in curvature is likely to cause damage to the cylinder 1 itself; on the other hand, since it is not clear about the maximum curvature that the battery under test can withstand, it is difficult to observe and record the cracks that appear on the battery under test in a timely manner due to the sudden change in curvature, which is likely to lead to a decrease in the accuracy of the measurement results.

[0076] To solve the above problems, the present invention adopts the measure of extracting the expansion medium in stages, and controls the slow and uniform change of the deformation amount of the cylinder 1 by changing the amount of the expansion medium in the expansion member 2 in small amounts and multiple times. It can be understood that the amounts of the expansion medium extracted at each stage in the staged extraction can be the same or different, and can also maintain a linear or non-linear change, etc. In the embodiments of the present invention, the amounts of the expansion medium charged and discharged in stages can vary dynamically according to the specific operating environment and the material of the cylinder 1, and the embodiments of the present invention do not limit this.

[0077] Meanwhile, similar to deforming the cylinder 1 to the preset initial curvature as described above, in the test, the cylinder 1 needs to be deformed to the preset test curvature. During the bending test of the cylinder 1, it is expected that the curvature changes uniformly, that is, the curvature and the amount of curvature change at each point of the cylinder 1 are consistent. In one embodiment, the expansion medium in the first expansion member can be preferentially extracted. When the difference between the curvature values at each point and the curvature values at adjacent points exceeds the preset error range, this point is defined as the point to be compensated, and the corresponding second expansion member at this point is activated. By charging and discharging the expansion medium to the second expansion member, the curvature of the local part of the cylinder 1 is compensated.

[0078] S204: Record the curvature of the cylinder 1 when the flexible photovoltaic module has cracks.

[0079] It can be understood that in the embodiments of the present invention, there is no limitation on the technical means for detecting the occurrence of cracks. In experimental scenarios with low requirements for test accuracy, visual observation can be based on the naked eye; in experimental scenarios with high test accuracy, for example, acoustic emission technology can be used to capture the generation of cracks on the battery cell to be tested and record the readings of the preset curvature sensor 12 at the moment when the cracks are generated on the battery cell to be tested.

[0080] Please refer to Figure 3 As shown, based on the same inventive concept as the foregoing flexible photovoltaic module bending test method, in one embodiment of the present invention, a flexible photovoltaic module bending test system 300 is provided, which includes: an initialization module 301, a mounting module 302, a test module 303, and a recording module 304.

[0081] Specifically, the initialization module 301 is used to inject the expansion medium into the expansion member 2 to make the cylinder 1 reach the preset initial curvature under the extrusion of the expansion member 2; the mounting module 302 is used to fixedly mount the flexible photovoltaic module on the mounting plane of the cylinder 1; the test module 303 is used to extract the expansion medium in the expansion member 2 in stages to make the cylinder 1 deform to the preset test curvature; the recording module 304 is used to record the curvature of the cylinder 1 when the flexible photovoltaic module has cracks and restore the cylinder 1 to the preset initial curvature.

[0082] Among them, the flexible photovoltaic module bending test system 300 provided by the present invention further includes an auxiliary module, which is used to evacuate the gas in the cavity between the flexible photovoltaic module and the installation plane based on the air holes 4 on the installation plane, so that the flexible photovoltaic module fits the installation plane.

Claims

1. A flexible photovoltaic module bending test device, characterized in that: include: A cylinder, wherein an installation plane for placing the flexible photovoltaic assembly is formed on the outer surface of the cylinder, and a receiving space is formed inside the cylinder; An expansion member is arranged in the receiving space and is used to deform the cylinder body through expansion so as to change the curvature of the outer surface of the cylinder body.

2. The flexible photovoltaic module bending test device according to claim 1, characterized in that: The installation plane is provided with a plurality of air holes which are connected with the receiving space.

3. The flexible photovoltaic module bending test device according to claim 1, characterized in that: An auxiliary bonding layer is provided on the installation plane; The outer surface of the cylinder is provided with a curvature sensor and a plurality of groups of strain gauges.

4. The flexible photovoltaic module bending test device according to claim 1, characterized in that: The cylinder is provided with an opening, and the opening extends from the upper end surface of the cylinder to the lower end surface of the cylinder.

5. The flexible photovoltaic module bending test device according to claim 1, characterized in that: The flexible photovoltaic assembly is fixedly mounted on the mounting plane based on a binding strap; The mounting plane is provided with a first strap limiting groove in a corresponding area of ​​the upper end surface along the axial direction of the cylinder; A second strap limiting groove matching with the first strap limiting groove is provided on the lower end surface of the cylinder.

6. The flexible photovoltaic module bending test device according to claim 1, characterized in that: A first limiting member and a second limiting member are correspondingly provided on both sides of the installation plane; A first limiting groove and a second limiting groove for fixing the flexible photovoltaic component are formed on the surfaces opposite to the first limiting member and the second limiting member.

7. The flexible photovoltaic module bending test device according to claim 1, characterized in that: The expansion member comprises a first expansion member for providing a basic expansion force and a second expansion member for compensating for a local curvature of the cylinder; The second expansion member is arranged between the inner surface of the cylinder and the first expansion member.

8. The flexible photovoltaic module bending test device according to claim 7, characterized in that: The second expansion member is a regular polygonal airbag, and a plurality of the second expansion members are closely laid on the inner surface of the cylinder.

9. A method for testing the bending of a flexible photovoltaic module, using the flexible photovoltaic module bending testing device as described in any one of claims 1 to 8, characterized in that: include: Injecting an expansion medium into the expansion member so that the cylinder reaches a preset initial curvature under the extrusion of the expansion member; The flexible photovoltaic assembly is fixedly mounted on the mounting plane of the cylinder; Extracting the expansion medium in the expansion member in stages to deform the cylinder to a preset test curvature; The curvature of the cylinder when cracks occur in the flexible photovoltaic module is recorded.

10. The flexible photovoltaic module bending test method according to claim 9, characterized in that: The method further comprises: Based on the air holes on the mounting plane, the air in the cavity between the flexible photovoltaic component and the mounting plane is released so that the flexible photovoltaic component is fitted to the mounting plane.

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