Method for testing current gain of light reflecting unit of photovoltaic module

Abstract

The invention discloses a photovoltaic module light reflection unit current gain test method, after a light reflection unit to be tested is accurately installed on a test position of a simulation module, an evaluation process is started, and the method specifically comprises the following steps: a point light source irradiates the light reflection unit in the test position after transmitting a light guide unit; the reflection unit receives incident light and forms reflected light, and the reflected light is transmitted or refracted or reflected by the light guide unit and then is directionally emitted to the photovoltaic cell unit; the current generated by the photovoltaic cell unit is detected through the detection assembly so as to directly quantify the current gain effect of the light reflection unit. The method highly simulates the optical environment of a real component, and can ensure that the evaluation result accurately reflects the actual performance of the reflective unit.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic equipment, and in particular to a method for testing the current gain of the reflective unit of a photovoltaic module. Background Technology

[0002] The current gain evaluation of photovoltaic module reflector units faces a core challenge: traditional methods struggle to accurately simulate the actual optical structure and encapsulation conditions of modules in a laboratory environment, leading to a disconnect between test results and actual application performance. Conventional tests are often exposed to external ambient light interference, with insufficient light source stability and crude optical path design, making it impossible to precisely control the incident light angle and reflected light path, resulting in distorted quantification of reflector unit reflection efficiency. Simplified test structures lead to the loss of key parameters such as interlayer transmittance and interface refraction effects, causing significant deviations between the reflector unit's response in the simulated environment and its optical behavior in actual modules. Furthermore, the disassembly and reproducibility of test modules are cumbersome and lack repeatability, hindering efficient comparative experiments across multiple batches of reflector units and restricting the iterative efficiency of material research and optimization—all issues that urgently need to be addressed. Summary of the Invention

[0003] To address the technical problems existing in the background art, this invention proposes a method for testing the current gain of a photovoltaic module reflector unit, comprising: installing the reflector unit to be tested on a test position of a simulated module; providing a point light source, which is transmitted through a light guide unit and then directed towards the reflector unit in the test position; the reflector unit receiving the incident light and forming reflected light; the reflected light being refracted or reflected by the light guide unit and then directed towards the photovoltaic cell unit; and detecting the current generated by the photovoltaic cell unit through a detection module to evaluate the current gain of the reflector unit.

[0004] Furthermore, the tests were conducted in a darkroom environment.

[0005] Furthermore, the point light source is provided by a laser generator.

[0006] Furthermore, the light guiding unit includes a first glass layer and a first encapsulation film layer. The test position is located between the battery cell unit and the first encapsulation film layer, ensuring that the incident light reaches the reflector unit after passing through the first glass layer and the first encapsulation film layer.

[0007] Furthermore, the light guiding unit also includes a second glass layer and a second encapsulation film layer. The test position is located between the second encapsulation film layer and the second glass layer. The reflected light path is refracted to the solar cell unit through the second encapsulation film layer and the second glass layer.

[0008] Furthermore, the battery cell unit includes a first battery cell and a second battery cell, with a light guide gap reserved between them. The test position is located between or directly below the light guide gap. The step of installing the reflector unit includes placing the reflector unit inside or below the light guide gap and ensuring that the reflected light passes through the light guide gap and is directed to the battery cell unit.

[0009] Furthermore, the simulation component includes a main body and an insert. The main body has a groove. The step of installing the reflective unit includes fixing the reflective unit to the bottom of the insert and then embedding it into the groove of the main body to form a test position. After the test is completed, the insert is removed to replace the reflective unit, so as to achieve repeated testing.

[0010] This invention completely solves the problem of quantifying the current gain of reflective units by constructing a standardized testing system that highly replicates the optical environment of real components. The darkroom environment isolates all stray light interference, ensuring absolutely stable testing conditions and a significant improvement in data reliability. The laser generator provides a monochromatic, highly collimated point light source, which, combined with the multi-layer glass and encapsulation film structure of the light guide unit, accurately reproduces the internal optical path transmission mechanism of the component, making the reflection behavior of the reflective unit completely consistent with the actual application scenario. The pre-set light guide gap and inlay-type replaceable design of the cell unit enable low-loss transmission of reflected light and rapid replacement of reflective units, resulting in a simultaneous leap in testing sensitivity and operational efficiency. Crucially, under the premise of completely uniform light source parameters, light guide path, and environmental conditions, this system can accurately capture the differences in reflection efficiency of different reflective units, generating highly convincing comparative data that directly drives the optimization and selection decisions of reflective unit material performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of one of the structures of the simulation component in this invention;

[0012] Figure 2 This is a schematic diagram of one of the structures of the simulation component in this invention;

[0013] Figure 3 This is a schematic diagram of one of the structures of the simulation component in this invention;

[0014] Figure 4 This is a schematic diagram of one of the usage states of the simulation component in this invention;

[0015] Figure 5 This is a schematic diagram of one of the usage states of the simulation component in this invention;

[0016] Figure 6 This is a schematic diagram illustrating the principle of the present invention. Detailed Implementation

[0017] refer to Figure 1-6This invention proposes a method for testing the current gain of a photovoltaic module's reflective unit. After precisely installing the reflective unit 5 under test onto the test position 4 of a simulated module 1, the evaluation process is initiated. The method specifically includes the following steps: a point light source 2 illuminates the reflective unit 5 in the test position 4 after passing through a light guide unit 11; the reflective unit 5 receives the incident light and forms reflected light, which is then transmitted, refracted, or reflected by the light guide unit 11 and directed towards the photovoltaic cell unit 12; the current generated by the photovoltaic cell unit 12 is detected by a detection module 3 to directly quantify the current gain effect of the reflective unit 5. This method highly simulates the optical environment of a real module, ensuring that the evaluation results accurately reflect the actual performance of the reflective unit 5.

[0018] The tests were conducted in a darkroom environment, completely isolating external stray light interference, resulting in highly stable test conditions and significantly improved data reliability. Point light source 2 is provided by a laser generator, whose emitted monochromatic, highly collimated beam accurately penetrates the light guide unit 11. During the workflow, the position of the light source is calibrated to ensure focused light path, thereby greatly enhancing the uniformity and directional controllability of the light source, and thus improving measurement accuracy.

[0019] In one embodiment of the present invention: the light guide unit 11 includes a first glass layer 111 and a first encapsulation film layer 112. The test position 4 is fixed between the battery cell unit 12 and the first encapsulation film layer 112. During installation, the interlayer spacing is adjusted to ensure that the incident light passes through the first glass layer 111 and the first encapsulation film layer 112 without damage and reaches the surface of the reflector unit 5 directly, thereby perfectly replicating the component encapsulation structure and making the working state of the reflector unit 5 consistent with the actual application scenario. The light guide unit 11 further integrates a second glass layer 113 and a second encapsulation film layer 114. The test position 4 is set between the second encapsulation film layer 114 and the second glass layer 113. The reflected light is precisely guided to the battery cell unit 12 through the coordinated refraction of the second encapsulation film layer 114 and the second glass layer 113, thereby optimizing the light path transmission efficiency and maximizing the capture and utilization of reflected light energy.

[0020] In another embodiment of the present invention: the battery cell unit 12 is composed of a first battery cell 121 and a second battery cell 122, with a preset light guide gap 123 between them. The test position 4 is positioned between or directly below the light guide gap 123. When installing the reflector unit 5, it is embedded in the gap or placed below and the angle is calibrated to ensure that the reflected light passes through the light guide gap 123 without loss and directly hits the battery cell unit 12, thereby reducing light energy loss and simultaneously improving test sensitivity and efficiency.

[0021] In another embodiment of the present invention: the simulation component 1 adopts a combination design of a main body 101 and an inlay 102. The main body 101 has a groove 1011. The reflective unit 5 is fixed to the bottom of the inlay 102 and then embedded into the groove 1011 to form a sealed test position 4. After the test, the inlay 102 can be removed to quickly replace the reflective unit 5. The resulting technical effect is that the operation process is extremely simplified and supports efficient repeated testing. This standardized testing system is particularly suitable for comparative experiments. Under the same darkroom environment, light source parameters and light guide structure, the difference in reflective efficiency of different reflective units 5 can be accurately quantified. The resulting technical effect is that the horizontal comparative data has a high degree of consistency and persuasiveness.

[0022] Example data

[0023] Examples 1, 2, 3, and 4 are all placed in Figure 4 Testing during the invention process.

[0024] In Example 1, the functional film used in the reflective unit 5 is a planar aluminum-coated reflective film, which has a structure of a 50–100 nm thick aluminum reflective layer vacuum-deposited on a 25 μm PET substrate surface.

[0025] In Example 2, the functional film used in the reflective unit 5 is a white reflective film, which is formed by blending 15-20% titanium dioxide and EVA and pressing it into shape, with a thickness of 200μm.

[0026] In Example 3, the reflective unit 5 specifically uses a microprism aluminum-coated reflective film, with a 25μm PET film as the substrate. The surface is formed into a prism structure by UV curing resin, with the prism apex angle being 115°–122°, and coated with an aluminum reflective layer 50–100nm thick.

[0027] In Example 4, the reflective unit 5 specifically uses a reflective busbar, which uses tin-plated copper strip as the conductive substrate and is coated with aluminum high reflectivity material.

[0028] Efficiency = (Average Current / Cell Current) × 100%

[0029]

[0030] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for testing the current gain of a photovoltaic module's reflective unit, characterized in that, include: Install the reflective unit (5) to be tested onto the test position (4) of the simulation component (1); Provide a point light source (2) so that the point light source (2) passes through the light guide unit (11) and then shines on the reflective unit (5) in the test position (4); The reflective unit (5) receives incident light and forms reflected light; The reflected light is refracted or reflected by the light guide unit (11) and then directed to the photovoltaic cell unit (12); The current gain of the reflective unit (5) is evaluated by detecting the current generated by the photovoltaic cell unit (12) through the detection component (3).

2. The test method as described in claim 1, characterized in that, The test was conducted in a darkroom environment.

3. The test method as described in claim 1, characterized in that, The point light source (2) is provided by the laser generator.

4. The test method as described in claim 1, characterized in that, The light guide unit (11) includes a first glass layer (111) and a first encapsulation film layer (112). The test position (4) is located between the battery cell unit (12) and the first encapsulation film layer (112), and ensures that the incident light passes through the first glass layer (111) and the first encapsulation film layer (112) before reaching the reflector unit (5).

5. The test method as described in claim 4, characterized in that, The light guide unit (11) also includes a second glass layer (113) and a second encapsulation film layer (114). The test position (4) is located between the second encapsulation film layer (114) and the second glass layer (113). The reflected light path is refracted to the battery cell unit (12) through the second encapsulation film layer (114) and the second glass layer (113).

6. The test method as described in claim 1, characterized in that, The cell unit (12) includes a first cell (121) and a second cell (122), with a light guide gap (123) reserved between them. The test position (4) is located between or directly below the light guide gap (123). The step of installing the reflector (5) includes placing the reflector (5) inside or below the light guide gap (123) and ensuring that the reflected light passes through the light guide gap (123) and is directed to the cell unit (12).

7. The test method as described in claim 1, characterized in that, The simulation component (1) includes a main body (101) and an insert (102). The main body (101) is provided with a groove (1011). The step of installing the reflective unit (5) includes fixing the reflective unit (5) to the bottom of the insert (102) and then embedding it into the groove (1011) of the main body (101) to form a test position (4). After the test is completed, the insert (102) is removed to replace the reflective unit (5) to achieve repeated testing.

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