Photovoltaic module junction box welding quality detection device and detection method

Abstract

This application relates to the field of welding inspection technology, and proposes a welding quality inspection device and method for photovoltaic module junction boxes. It includes: an inspection table with an inspection station; a conveying device disposed on one side of the inspection table for transporting the photovoltaic module to the inspection station; a positioning device disposed on the inspection table for positioning the photovoltaic module at a preset inspection position; a testing device including a driving component and a probe mechanism, the driving component driving the probe mechanism to move and contact the electrical contacts at both ends of a diode inside the junction box; a pulse power supply for applying a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode; and a judgment mechanism for acquiring the forward voltage V of the diode. 测 and temperature T 测 Temperature T is obtained by fitting the curve. 测 The corresponding voltage drop V 设 When the forward voltage V 测 ≤1.1V 设 The welding quality is then determined to be acceptable. Using pulse voltage drop testing to judge welding quality ensures both testing speed and accuracy.

Description

Technical Field

[0001] This application relates to the field of welding inspection technology, and more specifically, to a device and method for inspecting the welding quality of photovoltaic module junction boxes. Background Technology

[0002] A junction box is a connecting device between the solar cell array and the solar charging control unit. Its main function is to connect and protect the photovoltaic modules, connecting the power generated by the cells to external wiring and conducting the current generated by the photovoltaic modules. The junction box contains integrated diodes; if some cells are damaged or shaded and unable to generate power, the diodes will bypass the faulty cells, increasing stability. During the photovoltaic module manufacturing process, the series-connected cell leads need to be soldered to the junction box. The quality of the soldering directly affects the quality and lifespan of the photovoltaic modules; therefore, post-soldering inspection is necessary.

[0003] In related technologies, the main method for inspecting welding quality is manual visual inspection. This typically involves employees visually examining the welded joints, sometimes using small tools to "poke" the weld strips to confirm their strength. This method has significant limitations; it is not only inefficient but also suffers from inconsistent and unreliable results due to the subjective judgment of the operators. Summary of the Invention

[0004] To address the technical problems of low inspection efficiency and lack of consistency and reliability in inspection results when manually inspecting the welding quality of photovoltaic module junction boxes, the first aspect of this application proposes a photovoltaic module junction box welding quality inspection device.

[0005] The second aspect of this application also proposes a method for inspecting the welding quality of photovoltaic module junction boxes.

[0006] In view of this, the first aspect of this application proposes a photovoltaic module junction box welding quality inspection device, comprising: an inspection table with an inspection station; a conveying device disposed on one side of the inspection table for transporting the photovoltaic module to the inspection station; a positioning device disposed on the inspection table for positioning the photovoltaic module at a preset inspection position; a testing device including a driving component and a probe mechanism, the driving component driving the probe mechanism to move to contact the electrical contacts at both ends of a diode inside the junction box; a pulse power supply for applying a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode; and a judgment mechanism for acquiring the forward voltage V of the diode. 测 and temperature T 测 Temperature T is obtained by fitting the curve. 测 The corresponding voltage drop V 设 When the forward voltage V 测 ≤1.1V 设 At that time, the welding quality was deemed acceptable.

[0007] In conjunction with the first aspect, in some feasible ways, the decision-making mechanism is also used to obtain V based on the least squares fitted curve. D For T J The characteristics of the diode, the measured diode temperature T 测 The corresponding voltage drop is set to V. 设 .

[0008] In conjunction with the first aspect, in some feasible embodiments, the positioning device includes: a first positioning mechanism disposed at the detection station; a transmission sensor disposed at the transmission device for detecting the arrival status of the photovoltaic module; and a positioning sensor disposed at the first positioning mechanism for confirming whether the photovoltaic module has reached the preset detection position.

[0009] In conjunction with the first aspect, in some feasible embodiments, the positioning device further includes: two second positioning mechanisms disposed opposite to each other, located on both sides of the first positioning mechanism; wherein the first positioning mechanism includes a positioning block, when the photovoltaic module triggers the transmission sensor, the first positioning mechanism rises, when the photovoltaic module reaches the position of the positioning block, the positioning sensor is triggered, and the two second positioning mechanisms move toward each other to clamp and position the photovoltaic module at a preset detection position.

[0010] In conjunction with the first aspect, in some feasible embodiments, the photovoltaic module junction box welding quality inspection device further includes: a robotic arm comprising two vertical beams spaced apart, the bottoms of the two vertical beams being connected by a crossbeam, a probe mechanism disposed on the crossbeam, and the robotic arm being capable of driving the probe mechanism to move relative to the photovoltaic module.

[0011] In conjunction with the first aspect, in some feasible embodiments, the testing apparatus further includes: a fixed base disposed on the crossbeam; a pressure sensor disposed below the fixed base, with a probe mechanism seat disposed at the lower end of the pressure sensor, the pressure sensor being used to monitor the probe contact pressure.

[0012] In conjunction with the first aspect, in some feasible embodiments, the probe mechanism includes: a probe holder disposed on a probe mechanism base; and a first probe disposed on the probe holder for measuring the forward voltage V of the diode. D The second probe, mounted on the probe holder and spaced apart from the first probe, is used to measure the diode current I. D The first and second probes are connected to the pulse power supply via test leads.

[0013] In conjunction with the first aspect, in some feasible embodiments, the photovoltaic module junction box welding quality inspection device further includes: a temperature detection device, mounted on a probe holder, for detecting the diode temperature T. 测 .

[0014] In conjunction with the first aspect, in some feasible implementations, the photovoltaic module junction box welding quality inspection device further includes: an alarm device connected to the judgment mechanism, which, when V is detected... 测 >1.1V 设 When this occurs, an audible and visual alarm is triggered.

[0015] The second aspect of this application proposes a method for inspecting the welding quality of photovoltaic module junction boxes, employing the photovoltaic module junction box welding quality inspection device described in any of the above-mentioned technical solutions. The inspection method includes: conveying the photovoltaic module to the inspection station of the inspection table via a conveying device; positioning the photovoltaic module to a preset inspection position via a positioning device; controlling the downward movement of the inspection probe to make contact between the inspection probe and the electrical contacts at both ends of the diode inside the photovoltaic module junction box; applying a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode in the junction box via a pulse power supply, and collecting the forward voltage V of the diode. 测 and diode temperature T 测 Temperature T is obtained from the least squares fitting curve. 测 The corresponding voltage drop V 设 If the forward voltage V 测 ≤1.1V 设 If the welding quality is satisfactory, then the welding quality is deemed acceptable.

[0016] Compared with related technologies, this application has the following technical advantages: The photovoltaic module junction box welding quality inspection device provided in this application includes an inspection table, a conveying device, a positioning device, a testing device, a pulse power supply, and a judgment mechanism. Through the cooperation of the conveying device and the positioning device, automatic transportation and positioning of the photovoltaic modules are achieved, improving inspection efficiency, reducing manual intervention, and minimizing human error. The testing device uses a driving component to move the probe mechanism, enabling the probe mechanism to accurately contact the electrical contacts at both ends of the diodes inside the junction box, ensuring the accuracy and reliability of the test.

[0017] The determination mechanism obtains the forward voltage V of the diode. 测 and temperature T 测 And the temperature T is obtained using the fitted curve. 测 The corresponding voltage drop V 设 This method achieves temperature-compensated judgment. It takes into account the impact of temperature on diode performance, improving the accuracy of soldering quality assessment.

[0018] When the forward voltage satisfies V 测 ≤1.1V 设 When determining whether a weld is qualified, the clear criteria make the test results more objective and quantifiable, facilitating quality control and traceability during the production process.

[0019] The photovoltaic module junction box welding quality inspection device provided in this application determines the welding quality by performing pulse voltage drop tests on the diodes in the junction box. It is then combined with a conveying device and a positioning device for batch inspection, which ensures both inspection speed and accuracy.

[0020] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 A schematic diagram of the structure of a photovoltaic module junction box welding quality inspection device according to one embodiment of this application is shown; Figure 2 A schematic diagram of the test apparatus in one embodiment of this application is shown; Figure 3 A schematic diagram of the diode detection state in one embodiment of this application is shown; Figure 4 A flowchart illustrating a photovoltaic module junction box welding quality inspection method according to one embodiment of this application is shown.

[0022] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Testing platform, 110 Conveying device, 120 First positioning mechanism, 122 Second positioning mechanism, 130 Testing device, 132 Probe mechanism, 134 Fixing base, 136 Pressure sensor, 137 Probe holder, 138 First probe, 139 Second probe, 140 Robotic arm, 142 Vertical beam, 146 Horizontal beam, 150 Temperature detection device, 200 Photovoltaic module. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0025] The following reference Figures 1 to 4 This application describes a photovoltaic module junction box welding quality inspection device and inspection method according to some embodiments.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the first aspect of this application provides a photovoltaic module junction box welding quality inspection device, including: an inspection table 100 with an inspection station on it; a conveying device 110 disposed on one side of the inspection table 100 for transporting a photovoltaic module 200 to the inspection station; a positioning device disposed on the inspection table 100 for positioning the photovoltaic module 200 at a preset inspection position; a testing device 130 including a driving member and a probe mechanism 132, the driving member driving the probe mechanism 132 to move to contact the electrical contacts at both ends of a diode inside the junction box; a pulse power supply for applying a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode; and a judgment mechanism for acquiring the forward voltage V of the diode. 测 and temperature T 测 Temperature T is obtained by fitting the curve. 测 The corresponding voltage drop V 设 When the forward voltage V 测 ≤1.1V 设 At that time, the welding quality was deemed acceptable.

[0027] The photovoltaic module junction box welding quality inspection device provided in this application includes an inspection table 100, a conveying device 110, a positioning device, a testing device 130, a pulse power supply, and a judgment mechanism. Through the cooperation of the conveying device 110 and the positioning device, automatic transportation and positioning of the photovoltaic module 200 are achieved, improving inspection efficiency, reducing manual intervention, and minimizing human error. The testing device 130 uses a driving component to move the probe mechanism 132, enabling the probe mechanism 132 to accurately contact the electrical contacts at both ends of the diodes inside the junction box, ensuring the accuracy and reliability of the test.

[0028] A pulsed power supply can apply a pulsed current to the diode that is equal to the STC short-circuit current of the photovoltaic module. The pulsed current can reduce the impact of the current on the diode temperature. STC (Standard Test Conditions) refers to the current value generated when the photovoltaic module is short-circuited under standard test conditions.

[0029] The determination mechanism obtains the forward voltage V of the diode. 测 and temperature T 测 And the temperature T is obtained using the fitted curve. 测 The corresponding voltage drop V 设 This method achieves temperature-compensated judgment. It takes into account the impact of temperature on diode performance, improving the accuracy of soldering quality assessment.

[0030] When the forward voltage satisfies V 测 ≤1.1V设 When determining whether a weld is qualified, the clear criteria make the test results more objective and quantifiable, facilitating quality control and traceability during the production process.

[0031] The photovoltaic module junction box welding quality inspection device provided in this application determines the welding quality by performing pulse voltage drop tests on the diodes in the junction box. It is then used in conjunction with the conveying device 110 and the positioning device for batch inspection, which ensures both inspection speed and accuracy.

[0032] In some embodiments provided in this application, the determination mechanism is further configured to obtain V based on the least squares fitted curve. D For T J The characteristics of the diode, the measured diode temperature T 测 The corresponding voltage drop is set to V. 设 .

[0033] In this embodiment, V is obtained by least-squares fitting curve. D (Diode voltage drop) versus T J The characteristics of diode temperature can more accurately describe the relationship between diode voltage drop and temperature. This fitting method based on actual measurement data takes into account the performance changes of the diode at different temperatures, thereby improving the accuracy of soldering quality assessment.

[0034] The measured diode temperature T 测 The corresponding voltage drop is set to V. 设 This solution achieves precise compensation for the effects of temperature. Since the voltage drop of a diode changes with temperature, failure to perform temperature compensation could lead to misjudgments of soldering quality. This method obtains the voltage drop setpoint corresponding to a specific temperature by fitting a curve, effectively eliminating the influence of temperature on the judgment result.

[0035] Least squares fitting curves can reduce the impact of measurement errors and noise on the judgment results. The V obtained through this method... D -T J The characteristic curve is smoother and conforms to actual physical laws, thus enhancing the reliability of the judgment result.

[0036] like Figure 1 As shown, in some embodiments provided in this application, the positioning device includes: a first positioning mechanism 120, disposed at the detection station; a transmission sensor, disposed at the transmission device 110, used to detect the arrival status of the photovoltaic module 200; and a positioning sensor, disposed at the first positioning mechanism 120, used to confirm whether the photovoltaic module 200 has reached the preset detection position.

[0037] In this embodiment, the positioning device includes a first positioning mechanism 120, a transmission sensor, and a positioning sensor. By setting the first positioning mechanism 120 at the inspection station, a clear positioning reference is provided for the photovoltaic module 200, ensuring that the module can be accurately placed in the preset position during inspection, providing a stable foundation for subsequent welding quality inspection.

[0038] A transmission sensor is installed on the transmission device 110 to monitor the position of the photovoltaic module 200 in real time during the transmission process. Once the photovoltaic module 200 is detected to have arrived at or approached the inspection station, subsequent operations can be triggered in a timely manner, improving the automation level and response speed of the inspection process.

[0039] A positioning sensor is mounted on the first positioning mechanism 120 to perform secondary confirmation when the component reaches the preset detection position. This dual confirmation mechanism (preliminary detection by the transmission sensor + precise confirmation by the positioning sensor) improves the accuracy of positioning and reduces detection errors caused by inaccurate positioning.

[0040] Through an automated, real-time positioning monitoring and feedback mechanism, this positioning device can quickly and accurately locate the photovoltaic module 200, thereby improving the efficiency of the entire testing process. At the same time, accurate positioning ensures the reliability of the testing results and reduces the risk of misjudgment due to positioning issues.

[0041] like Figure 1 As shown, in some embodiments provided in this application, the positioning device further includes: two second positioning mechanisms 122 disposed opposite to each other, located on both sides of the first positioning mechanism 120; wherein, the first positioning mechanism 120 includes a positioning block, when the photovoltaic module 200 triggers the transmission sensor, the first positioning mechanism 120 rises, when the photovoltaic module 200 reaches the position of the positioning block, the positioning sensor is triggered, and the two second positioning mechanisms 122 move towards each other, clamping and positioning the photovoltaic module 200 at a preset detection position.

[0042] In this embodiment, the positioning device further includes two second positioning mechanisms 122. By setting the second positioning mechanisms 122 that can move relative to each other on both sides of the first positioning mechanism 120, a composite positioning mode of "longitudinal blocking + lateral clamping" is formed. The positioning block achieves longitudinal limitation, and the clamping mechanisms on both sides achieve precise lateral centering, effectively eliminating the offset error of the photovoltaic module 200 during the transmission process and ensuring that the welding detection point is precisely aligned with the probe mechanism 132.

[0043] The second positioning mechanisms 122 on both sides adopt an adjustable clamping structure, which can automatically adjust the clamping distance according to the width of photovoltaic modules 200 of different specifications. In conjunction with the servo drive system, it achieves millimeter-level positioning accuracy, ensuring clamping stability while avoiding deformation of the photovoltaic module 200, which is particularly suitable for the positioning requirements of thin photovoltaic modules 200.

[0044] like Figure 1 As shown in some embodiments provided in this application, the photovoltaic module junction box welding quality inspection device further includes: a robotic arm 140, including two vertical beams 142 spaced apart, the bottoms of the two vertical beams 142 being connected by a horizontal beam 146, a probe mechanism 132 being disposed on the horizontal beam 146, and the robotic arm 140 being able to drive the probe mechanism 132 to move relative to the photovoltaic module 200.

[0045] In this embodiment, the photovoltaic module junction box welding quality inspection device also includes a robotic arm 140. A gantry structure consisting of double vertical beams 142 and a horizontal beam 146 allows the probe mechanism 132 to move freely in three directions: X (lateral), Y (longitudinal), and Z (vertical). This three-dimensional motion capability ensures that the probe can accurately reach electrical contacts at any position within the junction box, adapting to junction box designs with different layouts, and is particularly suitable for the inspection needs of multiple diodes in parallel or complex circuit structures.

[0046] The spacing of the double vertical beams 142 and the bridging structure of the horizontal beams 146 form an open operating space above the inspection table 100. This facilitates the loading and unloading of photovoltaic modules 200 and avoids interference between the robotic arm 140 and other equipment (such as the conveyor device 110), thereby improving the overall layout efficiency of the inspection line.

[0047] In some embodiments provided in this application, the testing device 130 further includes: a fixed base 134 disposed on the crossbeam 146; a pressure sensor 136 disposed below the fixed base 134, and a probe mechanism 132 seat disposed at the lower end of the pressure sensor 136, the pressure sensor 136 being used to monitor the probe contact pressure.

[0048] In this embodiment, the testing device 130 further includes a mounting base 134 and a pressure sensor 136. By placing the pressure sensor 136 between the mounting base 134 and the probe mechanism 132, the contact pressure between the probe and the electrical contacts of the junction box can be monitored in real time. When the pressure sensor 136 detects that the pressure exceeds the range, it automatically adjusts the motion parameters of the drive component to ensure that the contact pressure is stable at an optimal value each time, avoiding contact deformation due to excessive pressure or poor contact caused by insufficient pressure.

[0049] During probe depressurization, pressure sensor 136 continuously feeds back pressure data. If pressure fluctuations are detected, closed-loop control of the contact pressure can be achieved by adjusting the probe tip position or depressurization speed, ensuring reliable electrical connection between the probe and the electrical contacts during the test.

[0050] like Figure 2As shown, in some embodiments provided in this application, the probe mechanism 132 includes: a probe holder 137 disposed on the probe mechanism 132 base; and a first probe 138 disposed on the probe holder 137 for measuring the forward voltage V of the diode. D The second probe 139 is disposed on the probe holder 137 and spaced apart from the first probe 138. The second probe 139 is used to measure the diode current I. D The first probe 138 and the second probe 139 are connected to the pulse power supply via test leads.

[0051] In this embodiment, the probe mechanism 132 includes a probe holder 137, a first probe 138, and a second probe 139. Through the coordinated operation of the first probe 138 and the second probe 139, the forward voltage V of the diode is achieved. D and current I D The synchronous acquisition of data is achieved through a dual-parameter synchronous measurement method. This method can accurately obtain the diode's current-voltage characteristic curve, providing more comprehensive data support for welding quality assessment and avoiding misjudgments that may result from single-parameter measurement.

[0052] The first probe 138 and the second probe 139 are spaced apart on the probe holder 137, effectively preventing electromagnetic interference between the voltage measurement and current measurement paths. This physical isolation improves the purity of the signal measurement, ensuring V D and I D Its measurement accuracy is excellent, making it particularly suitable for high-precision pulse current testing scenarios.

[0053] like Figure 2 As shown in some embodiments provided in this application, the photovoltaic module junction box welding quality inspection device further includes: a temperature detection device 150, disposed on the probe holder 137, for detecting the diode temperature T. 测 .

[0054] In this embodiment, the photovoltaic module junction box welding quality inspection device further includes a temperature detection device 150. The temperature testing device 130 is mounted on the probe holder 137 and can move synchronously with the probe mechanism 132 to ensure accurate measurement of the diode forward voltage V. D and current I D Simultaneously, the diode temperature T is acquired in real time. 测 .

[0055] The temperature testing device 130 is mounted on the probe holder 137 to avoid taking up extra testing space and to maintain the lightweight and flexibility of the probe mechanism 132.

[0056] In practical applications, the temperature detection device 150 can be an infrared temperature sensor.

[0057] In some embodiments provided in this application, the photovoltaic module junction box welding quality inspection device further includes: an alarm device connected to the judgment mechanism, which detects V... 测 >1.1V 设 When this occurs, an audible and visual alarm is triggered.

[0058] In this embodiment, the alarm device is connected to the judgment mechanism and can receive the diode forward voltage V in real time. 测 The detection data. When V 测 >1.1V 设 When this occurs, an audible and visual alarm is triggered, alerting the operator that there is an abnormality in the welding of the junction box.

[0059] Alarm devices can improve the automation level and fault handling efficiency of the inspection line, and work in conjunction with the judgment mechanism, probe mechanism 132, etc., to form a complete closed-loop control system for welding quality.

[0060] In practical applications, alarm devices include buzzers and LED indicator lights.

[0061] like Figure 4 As shown, the second aspect of this application provides a method for inspecting the welding quality of photovoltaic module junction boxes, employing the photovoltaic module junction box welding quality inspection device in any of the above embodiments. The inspection method includes: S202: The photovoltaic modules are transported to the testing station of the testing platform by a conveying device; the photovoltaic modules are positioned to the preset testing position by a positioning device; S204: Control the detection probe to move down so that the detection probe makes contact with the electrical contacts at both ends of the diode inside the photovoltaic module junction box; S206: Apply a pulse current equal to the short-circuit current of the STC module to the diode in the junction box via a pulse power supply, and collect the forward voltage V of the diode. 测 and diode temperature T 测 ; S208: Temperature T is obtained from the least squares fitting curve. 测 The corresponding voltage drop V 设 If the forward voltage V 测 ≤1.1V 设 If the welding quality is satisfactory, then the welding quality is deemed acceptable.

[0062] This application provides a method for inspecting the welding quality of photovoltaic module junction boxes. Through the cooperation of a conveying device and a positioning device, automatic transportation and positioning of the photovoltaic modules are achieved. A pulse power supply can apply a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode, and the forward voltage V of the diode is obtained. 测 and temperature T 测 And the temperature T is obtained using the fitted curve. 测 The corresponding voltage drop V 设This method achieves temperature-compensated judgment. It takes into account the impact of temperature on diode performance, improving the accuracy of welding quality assessment.

[0063] The photovoltaic module junction box welding quality inspection method provided in this application determines the welding quality by performing a pulse voltage drop test on the junction box diodes. Combined with a conveying and positioning device, batch inspection is performed, ensuring both inspection speed and accuracy. In a specific embodiment, the photovoltaic module junction box welding quality inspection includes a module support device and a testing device 130. The module support device includes a conveying device 110 and a positioning device. The conveying device 110 is used to transport the photovoltaic module 200 to the inspection station along a first direction, and a conveying sensor is provided on the conveying device 110. The positioning device includes a first positioning mechanism 120 and two symmetrically arranged second positioning mechanisms 122. A positioning sensor is provided in the incoming direction of the first positioning mechanism 120. When the photovoltaic module 200 triggers the conveying sensor, the first positioning device rises. When the photovoltaic module 200 reaches the positioning stop position, the positioning sensor is triggered, activating the second positioning mechanisms 122. The two second positioning mechanisms 122 move towards each other, positioning the photovoltaic module 200 at a preset inspection position. Figure 1 As shown, the direction indicated by arrow X represents the first direction.

[0064] The testing device 130 includes a robotic arm 140, a testing mechanism, and a pulse power supply. The robotic arm 140 can move along the long side of the photovoltaic module 200 to adapt to different module junction box positions. The testing mechanism is fixed to a crossbeam 146 at the lower part of the robotic arm 140 and its position is adjustable. The testing mechanism is provided with a mounting base 134, and a pressure sensor 136 is disposed below the mounting base 134. A probe mechanism 132 is disposed at the lower end of the pressure sensor 136. A probe holder 137 is provided at the lower end of the probe holder 137, which is fixed to the probe mechanism 132 and its position is adjustable. The probe mechanism 132 includes a first probe 138 and a second probe 139, corresponding to the diode forward voltage V, respectively. D and diode current I D The probe holder 137 is connected to a pulse power supply via test leads. A temperature testing device 130 is located in the middle of the probe holder 137. The pulse power supply is used to apply a pulse current to the diode in the junction box and measure the diode's voltage drop. Figure 1 As shown, the direction indicated by arrow Y represents the long side direction of photovoltaic module 200.

[0065] The specific testing method is as follows: Determine the STC (Short-Circuit Current) of the photovoltaic module according to its label or instruction manual. For bifacial photovoltaic modules, use the BSI (Best Intake) value under high irradiance, as defined in IEC 61215-1:2021.

[0066] like Figure 3 As shown, V D and I D The probe is pressed onto the diode terminal, with the pressure set to 2N-3N.

[0067] Control the diode temperature to (20±2)℃, apply a pulse current equal to the STC short-circuit current of the photovoltaic module, with a pulse width of 1ms, and measure the diode forward voltage V. D1 For bifacial photovoltaic modules, use the short-circuit current value when increasing BSI irradiance.

[0068] Using the same procedure, V was measured when the diode temperature reached (30±2)℃. D2 .

[0069] Using the same procedure, V was measured when the diode temperature reached (40±2)℃. D3 .

[0070] Using the same procedure, V was measured when the diode temperature reached (50±2)℃. D4 .

[0071] Then, through V D1 V D2 V D3 and V D4 The least squares fitting curve yields V D For T J Its characteristics.

[0072] Diode welding performance test: Apply a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode in the junction box. The pulse width is 1ms, and measure the forward voltage V of the diode. 测 and diode temperature T 测 V is obtained from the least squares fitting curve. D For T J Based on the characteristics of this feature, the voltage drop corresponding to the measured diode temperature is set to V. 设 When V 测 ≤1.1V 设 The welding effect was considered to be good at the time.

[0073] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module junction box welding quality inspection device, characterized in that, include: A testing station is provided on the testing platform. A conveying device is installed on one side of the testing platform for transporting photovoltaic modules to the testing station; A positioning device, disposed on the testing platform, is used to position the photovoltaic module at a preset testing position; The testing apparatus includes a driving element and a probe mechanism, wherein the driving element drives the probe mechanism to move to contact the electrical contacts at both ends of a diode inside a junction box; A pulse power supply is used to apply a pulse current equal to the STC short-circuit current of the photovoltaic module to the diode, wherein the pulse width of the pulse current is 1ms. A determining mechanism is used to obtain the forward voltage V of the diode. 测 and temperature T 测 It is also used to obtain V based on the least squares fitted curve. D For T J The characteristics of the diode, the measured diode temperature T 测 The corresponding voltage drop is set to V. 设 When the forward voltage V 测 ≤1.1V 设 At that time, the welding quality was deemed acceptable.

2. The photovoltaic module junction box welding quality inspection device according to claim 1, characterized in that, The positioning device includes: A first positioning mechanism is installed at the detection station; A transmission sensor, installed in the transmission device, is used to detect the arrival status of the photovoltaic module; A positioning sensor is installed in the first positioning mechanism to confirm whether the photovoltaic module has reached the preset detection position.

3. The photovoltaic module junction box welding quality inspection device according to claim 2, characterized in that, The positioning device further includes: Two second positioning mechanisms are positioned opposite each other, located on either side of the first positioning mechanism; The first positioning mechanism includes a positioning block. When the photovoltaic module triggers the transmission sensor, the first positioning mechanism rises. When the photovoltaic module reaches the position of the positioning block, it triggers the positioning sensor, and the two second positioning mechanisms move towards each other to clamp and position the photovoltaic module at the preset detection position.

4. The photovoltaic module junction box welding quality inspection device according to claim 1, characterized in that, Also includes: The robotic arm includes two vertical beams spaced apart, the bottoms of which are connected by a crossbeam. The probe mechanism is mounted on the crossbeam, and the robotic arm can drive the probe mechanism to move relative to the photovoltaic module.

5. The photovoltaic module junction box welding quality inspection device according to claim 4, characterized in that, The testing apparatus also includes: A fixed base is provided on the crossbeam; A pressure sensor is disposed below the fixed base, and a probe mechanism seat is disposed at the lower end of the pressure sensor. The pressure sensor is used to monitor the probe contact pressure.

6. The photovoltaic module junction box welding quality inspection device according to claim 5, characterized in that, The probe mechanism includes: The probe holder is disposed on the probe mechanism base; The first probe, mounted on the probe holder, is used to measure the forward voltage V of the diode. D ; The second probe is disposed on the probe holder and spaced apart from the first probe. The second probe is used to measure the diode current I. D ; The first probe and the second probe are connected to the pulse power supply via test leads.

7. The photovoltaic module junction box welding quality inspection device according to claim 6, characterized in that, Also includes: A temperature detection device, mounted on the probe holder, is used to detect the diode temperature T. 测 .

8. The photovoltaic module junction box welding quality inspection device according to any one of claims 1 to 7, characterized in that, Also includes: An alarm device, connected to the determination mechanism, detects V. 测 >1.1V 设 When this occurs, an audible and visual alarm is triggered.

9. A method for inspecting the welding quality of a photovoltaic module junction box, comprising using the photovoltaic module junction box welding quality inspection device as described in any one of claims 1 to 8, characterized in that, The detection method includes: The photovoltaic modules are transported to the testing station of the testing platform via a conveyor device; The photovoltaic modules are positioned to a preset detection location using a positioning device; Control the detection probe to move downwards, so that the detection probe makes contact with the electrical contacts at both ends of the diode inside the photovoltaic module junction box; A pulse current equal to the STC short-circuit current of the photovoltaic module is applied to the diode in the junction box using a pulse power supply, and the forward voltage V of the diode is collected. 测 and diode temperature T 测 ; The temperature T is obtained from the least squares fitting curve. 测 The corresponding voltage drop V 设 If the positive voltage V 测 ≤1.1V 设 If the welding quality is satisfactory, then the welding quality is deemed acceptable.

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