A photovoltaic module and method of testing temperature of the module

Abstract

This invention discloses a photovoltaic module capable of testing module temperature and its usage method, relating to the field of photovoltaic cell technology. The module includes, from top to bottom, a glass plate, a first EVA layer, a temperature lead-out layer, a second EVA layer, a cell string, a third EVA layer, and a backsheet layer. The cell string includes multiple parallel-arranged cell modules, each cell module comprising multiple individual solar cells connected in series or parallel. Temperature lead-out terminals are provided on the frame of each cell module, and one end of the temperature lead-out layer extends to the outside of the photovoltaic module. An insulating layer is provided at the connection point between the temperature lead-out layer and the interconnecting strip. The photovoltaic module capable of testing module temperature in this invention utilizes the excellent thermal conductivity of copper sheets to conduct heat from inside the photovoltaic module before temperature measurement. This method provides a more accurate temperature reading compared to traditional external testing of photovoltaic modules.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cells, in particular to a photovoltaic module capable of testing module temperature. BACKGROUND

[0002] Every country attaches great importance to the energy problem of the country, and the energy problem can determine the economic problem in some aspects, so photovoltaic power generation is increasingly recognized by various countries, and to some extent, it belongs to the sunrise of new energy. With the exploration of many photovoltaic technology people, the steps of using solar energy have not stopped, whether it is photovoltaic or photothermal, there are many aspects of utilization, such as solar water heater, solar street lamp, solar drinking machine and so on. In life, the solar cell panel everywhere has proved that the use of solar energy will only increase but not decrease.

[0003] In practical application, the power generation performance of the photovoltaic power generation system is greatly affected by natural environmental conditions, and the working temperature of the solar cell module is one of the important factors affecting the performance of the photovoltaic power generation system. When using the traditional photovoltaic module, we need to use the IV tester to check the performance of the module, and when measuring the temperature, the temperature probe is attached to the back of the module to measure the temperature of the module. However, such measurement is not accurate enough, and only a rough temperature can be obtained. If you want to measure the real temperature inside the module, such method is obviously not accurate enough, so the photovoltaic module capable of testing the temperature of the module is particularly important, which can detect the real temperature inside the battery module and facilitate the evaluation of the performance of the module. SUMMARY

[0004] To solve the above technical problems, the present application provides a photovoltaic module capable of testing the temperature of the module to measure more accurate temperature.

[0005] To achieve the above purpose, the present application provides the following scheme:

[0006] The present application provides a photovoltaic module capable of testing the temperature of the module, which comprises a glass plate, a first EVA layer, a battery string, a second EVA layer and a back plate arranged in sequence from top to bottom. The battery string comprises a plurality of parallelly arranged battery modules, and the battery module comprises a plurality of series or parallel single solar cells. One end of the temperature lead-out layer extends to the outside of the photovoltaic module.

[0007] Optionally, the blank area between the single solar cells is provided with a temperature lead-out layer, and the temperature lead-out layer is led out from the frame.

[0008] Optionally, the temperature lead-out layer has an insulating layer at the junction with the interconnection strip, and the temperature lead-out layer has an insulating heat preservation layer at the junction with the frame.

[0009] Optionally, the bottom of the back panel is provided with multiple junction boxes, and the temperature lead-out layer leads out a temperature terminal on each side of the frame.

[0010] Optionally, the temperature lead-out layer includes a copper sheet and a temperature test terminal; the copper sheet is uniformly and parallelly distributed in the gaps between the individual solar cells, the temperature test terminal is connected to the copper sheet, and the temperature test terminal is disposed outside the frame.

[0011] Optionally, the frame is provided with copper lead-out terminals.

[0012] This invention also discloses a method for using a photovoltaic module capable of testing module temperature, comprising the following steps:

[0013] 1. The photovoltaic module under test and the temperature-measuring photovoltaic module are placed in the same plane, at the optimal tilt angle according to the local latitude, with an azimuth angle of 0 degrees;

[0014] 2. The irradiation tester and the component under test are placed on the same plane, and the azimuth angle is also set to 0 degrees.

[0015] 3. Connect the temperature probe of the test equipment to the first and second thermal measurement ports of the temperature measurement component, and connect the photovoltaic module test terminals to the output port of the component under test;

[0016] 4. Once the component temperatures measured at the first and second thermal measurement ports are the same, the testing equipment will begin inputting the parameters of the photovoltaic component under test.

[0017] 5. When the irradiation value of the irradiation tester is greater than 700W / ㎡ and stabilizes for 10s, test the electrical performance value of the component under test;

[0018] 6. Use the temperature of the thermometric photovoltaic module being tested to calibrate the electrical performance of the photovoltaic module under test.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] The photovoltaic module with testable module temperature in this invention uses the excellent thermal conductivity of copper sheets to conduct heat out of the photovoltaic module before temperature measurement. This results in a temperature measurement that is more consistent with the internal temperature of the module and provides a more accurate temperature value compared to traditional IV testing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Fig. 1 This is a structural diagram of a photovoltaic module whose component temperature can be tested.

[0023] Fig. 2 This is a cross-sectional schematic diagram of a photovoltaic module capable of testing component temperature.

[0024] Fig. 3 This is a schematic diagram of a partial structure at the interface between the temperature lead-out layer and the frame of a photovoltaic module that can be used to test the module temperature.

[0025] Figure label:

[0026] 1. Junction box; 2. Interconnection strip; 3. Frame; 4. Individual solar cell; 5. Copper sheet; 6. Insulation layer; 7. First thermal measurement port; 8. Second thermal measurement port; 9. Glass plate; 10. Back plate; 11. First EVA layer; 12. Second EVA layer; 13. Insulation layer. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figs. 1 to 3 As shown, this embodiment provides a photovoltaic module capable of testing module temperature, including a glass plate 9, a first EVA layer 11, a cell string, a second EVA layer 12 and a backsheet 10 arranged sequentially from top to bottom; the cell string includes multiple cell modules arranged in parallel, and the cell module includes multiple individual solar cells 4 connected in series or in parallel; one end of the temperature lead-out layer extends to the outside of the photovoltaic module.

[0030] A temperature lead-out layer is provided in the blank area between the individual solar cells 4, and the temperature lead-out layer extends from the frame 3.

[0031] There is an insulating layer 6 at the junction of the temperature lead-out layer and the interconnecting strip 2, and an insulating and heat-preserving layer 13 at the junction of the temperature lead-out layer and the frame 3.

[0032] The bottom of the back panel 10 is provided with multiple junction boxes 1, and the temperature lead-out layer leads out a temperature terminal on each side of the frame 3, namely the first heat measurement port 7 and the second heat measurement port 8.

[0033] The temperature lead-out layer includes a copper sheet 5 and a temperature test terminal; the copper sheet 5 is evenly and parallelly distributed in the gaps between the individual solar cells 4, and the temperature test terminal is connected to the copper sheet 5 and is located outside the frame 3.

[0034] The frame 3 is equipped with copper lead-out terminals.

[0035] Furthermore, the individual solar cell 4 is a monocrystalline silicon cell. The glass plate 91 is made of tempered glass.

[0036] In a more specific embodiment, the copper sheet 5 is embedded in the gap of the individual solar cell 4 and then led out. This allows for more accurate and real-time measurement of the temperature of the copper sheet 5, which represents the temperature of the battery module and enables better evaluation of the module's performance. To more accurately measure the temperature of the battery module, each cell is connected by welding them together in an "A" shape using interconnecting strips 2. Therefore, the copper sheet 5 will touch the interconnecting strips 2. To prevent copper from conducting electricity through the interconnecting strips 2, an insulating sheet is placed at the contact point between the interconnecting strips 2 and the copper sheet 5. The led-out copper sheet 5 is connected to the junction box 1, and the temperature of the copper sheet 5 is measured at the junction box 1. Temperature differences will occur near the frame 3 and the center of the battery module; therefore, the copper sheet 5 can be flexibly led out through the backplate 10. Ensuring the obtained temperature is sufficiently accurate plays a significant role in evaluating module performance and facilitates subsequent maintenance and upkeep of the module.

[0037] Example 2:

[0038] This embodiment provides a method for using a photovoltaic module that can test the module temperature, including the following steps:

[0039] 1. The photovoltaic module under test and the temperature-measuring photovoltaic module are placed in the same plane, at the optimal tilt angle according to the local latitude, with an azimuth angle of 0 degrees;

[0040] 2. The irradiation tester and the component under test are placed on the same plane, and the azimuth angle is also set to 0 degrees.

[0041] 3. Connect the temperature probe of the test equipment to the first thermal measurement port 7 and the second thermal measurement port 8 of the temperature measurement component, and connect the photovoltaic module test terminal to the output port of the component under test;

[0042] 4. Once the component temperatures measured at the first thermal measurement port 7 and the second thermal measurement port 8 are the same, the testing equipment will begin inputting the parameters of the photovoltaic component under test.

[0043] 5. When the irradiation value of the irradiation tester is greater than 700W / ㎡ and stabilizes for 10s, test the electrical performance value of the component under test;

[0044] 6. Use the temperature of the thermometric photovoltaic module being tested to calibrate the electrical performance of the photovoltaic module under test.

[0045] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for using a photovoltaic module capable of testing module temperature, characterized in that, The temperature-measuring photovoltaic module includes, from top to bottom, a glass plate, a first EVA layer, a cell string, a second EVA layer, and a backsheet; the cell string includes multiple cell modules arranged in parallel, and each cell module includes multiple individual solar cells connected in series or parallel; a temperature lead-out layer is provided in the blank area between the individual solar cells, and one end of the temperature lead-out layer extends to the outside of the photovoltaic module; The usage method includes the following steps: (1) The photovoltaic module to be tested and the photovoltaic module that can be measured are in the same plane and are placed at the optimal tilt angle according to the local latitude, with an azimuth angle of 0 degrees. (2) The irradiation tester and the component under test are placed on the same plane, and the azimuth angle is also placed at 0 degrees. (3) Use the temperature probe of the test equipment to connect the first thermal measurement port and the second thermal measurement port of the temperature measuring component, and connect the photovoltaic module test terminal to the output port of the component under test; (4) Once the temperatures of the components tested at the first and second thermal measurement ports are the same, the testing equipment will begin to input the parameters of the photovoltaic module to be tested. (5) When the irradiation value of the irradiation tester is greater than 700W / m 2 After stabilizing for 10 seconds, the electrical performance value of the component under test is tested. (6) Use the temperature of the thermometric photovoltaic module being tested to correct the electrical performance of the photovoltaic module under test.

2. The method of using the photovoltaic module capable of testing module temperature according to claim 1, characterized in that, The temperature lead-out layer extends from the frame.

3. The method of using the photovoltaic module capable of testing module temperature according to claim 2, characterized in that, The junction between the temperature lead-out layer and the interconnecting strip has an insulating layer, and the junction between the temperature lead-out layer and the frame has an insulating and heat-preserving layer.

4. The method of using the photovoltaic module capable of testing module temperature according to claim 3, characterized in that, The bottom of the back panel is provided with multiple junction boxes, and the temperature lead-out layer leads out a temperature terminal on each side of the frame.

5. The method of using the photovoltaic module capable of testing module temperature according to claim 2, characterized in that, The temperature lead-out layer includes a copper sheet and a temperature test terminal; the copper sheet is evenly and parallelly distributed in the gaps between the individual solar cells, and the temperature test terminal is connected to the copper sheet and is located outside the frame.

6. The method of using the photovoltaic module capable of testing module temperature according to claim 5, characterized in that, The frame is provided with copper lead-out terminals.

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