Photovoltaic bypass protection module and junction box assembly

Abstract

The utility model discloses a photovoltaic bypass protection module and junction box assembly, which comprises N groups of first electronic devices with bypass protection function and unilateral conductivity, N is greater than or equal to 1, the N groups of first electronic devices are mutually connected in series, and the first electronic devices are configured to be used for being connected in series and parallel with solar cells. The second electronic device has an anti-reflux function, the second electronic device is connected with the N groups of first electronic devices in series, and a first electrode of the second electronic device is configured to be electrically connected with a second electrode of a series circuit formed by the N groups of first electronic devices; one end of the electric conductor is electrically connected with the first electrode of the second electronic device, the other end of the electric conductor is used for being electrically connected with an external detection power source, and by arranging the electric conductor in the structure, EL testing of the junction box can be achieved under the condition that the junction box does not need to be disassembled.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic bypass protection modules, and in particular to a photovoltaic bypass protection module and junction box assembly. Background Technology

[0002] The photovoltaic bypass protection module is an important component of photovoltaic modules, mainly used to improve the reliability and efficiency of photovoltaic systems. When a cell in a photovoltaic string experiences current mismatch due to shading, damage, or performance degradation, the bypass module provides a low-resistance bypass path for that cell, allowing current to flow around the faulty cell, thereby reducing hot spot effects and maintaining the overall power generation efficiency of the photovoltaic module.

[0003] When there is a grid fault or voltage fluctuation, the current in the photovoltaic bypass protection module may flow in the reverse direction, which can damage the bypass protection module and the equipment connected to it. Currently, many companies install fuses on the connectors that connect to the photovoltaic bypass protection module to prevent reverse current flow, but fuse connectors are expensive.

[0004] Chinese patent 202423222139.9 describes a photovoltaic bypass protection and anti-reverse current module. This module integrates a unidirectional conductive electronic device with a traditional bypass protection module to prevent reverse current flow. Both the bypass protection and anti-reverse current devices are integrated into a junction box, using a PCB board for circuit layout, resulting in low cost and improved stability. However, this junction box is not suitable for EL testing (Electroluminescence testing). Therefore, a photovoltaic bypass protection and anti-reverse current module that facilitates EL testing is needed. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a photovoltaic bypass protection module that facilitates EL testing.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a photovoltaic bypass protection module, including N groups of first electronic devices with unidirectional conductivity and bypass protection function, wherein N≥1, the N groups of first electronic devices are connected in series with each other, the first electronic devices are configured to be connected in parallel with the solar cell sub-string, and a second electronic device with anti-reverse current function is connected in series with the N groups of first electronic devices, the first electrode of the second electronic device is configured to be electrically connected to the second electrode of the series circuit composed of the N groups of first electronic devices, and also includes a conductor, one end of which is electrically connected to the first electrode of the second electronic device, and the other end of which is used to be electrically connected to an external detection power supply.

[0007] Furthermore, the conductor is a connector, with its first end electrically connected to the first electrode of the second electronic device and its second end electrically connected to the power supply for EL detection.

[0008] Furthermore, the conductor is a cable with a third end and a fourth end at its two ends. The third end of the cable is electrically connected to the first electrode of the second electronic device, and the fourth end of the cable is used to electrically connect to an external detection power supply.

[0009] Furthermore, the conductor includes a cable and a connector, the third end of the cable is electrically connected to the first electrode of the second electronic device, the fourth end of the cable is electrically connected to the first end of the connector, and the second end of the connector is used to be electrically connected to an external detection power supply.

[0010] Furthermore, the first electronic device includes a first electronic device body and a first pin and a second pin electrically connected to the first electronic device body. The first pin represents the first electrode of the first electronic device, and the second pin represents the second electrode of the first electronic device.

[0011] The second electronic device includes a second electronic device body and a third pin and a fourth pin electrically connected to the second electronic device body. The third pin represents the first electrode of the second electronic device, and the fourth pin represents the second electrode of the second electronic device.

[0012] Furthermore, it also includes a first conductive module for electrically connecting to a first electronic device and a second conductive module for electrically connecting to a second electronic device, wherein the number of first electronic devices electrically connected to the first conductive module is one or more, and the number of second electronic devices electrically connected to the second conductive module is one or more.

[0013] Furthermore, the first conductive module and the second conductive module are PCB boards, and the PCB boards are provided with a first conductive area, a second conductive area, a third conductive area, a fourth conductive area, a first busbar soldering area, and a second busbar soldering area;

[0014] The first busbar welding area and the second busbar welding area are insulated from each other; the third conductive area and the fourth conductive area are insulated from each other; and the first conductive area and the second conductive area are insulated from each other.

[0015] The first busbar welding area is electrically connected to the first conductive area, the second busbar welding area is electrically connected to the third conductive area, and the second conductive area and the third conductive area are electrically connected;

[0016] The first electrode of the first electronic device is electrically connected to the first conductive region, the second electrode of the first electronic device is electrically connected to the second conductive region, the first electrode of the second electronic device is electrically connected to the third conductive region, and the second electrode of the second electronic device is electrically connected to the fourth conductive region.

[0017] Furthermore, it also includes a fifth conductive area disposed on the PCB board, which is electrically connected to the fourth conductive area. The fifth conductive area is configured as an output terminal and is used to electrically connect to an external photovoltaic module.

[0018] Furthermore, it also includes a sixth conductive area disposed on the PCB board, which is electrically connected to the third conductive area. The sixth conductive area is configured as an EL test terminal and is electrically connected to one end of the conductor.

[0019] Furthermore, the conductor is electrically connected to the sixth conductive area via lines on the PCB board.

[0020] Alternatively, the conductor can be electrically connected to the sixth conductive area via lines and vias on the PCB board.

[0021] This utility model also discloses a junction box assembly, including the photovoltaic bypass protection module described above. The number of junction boxes is N, and the N junction boxes are configured to respectively house N groups of first electronic devices with unidirectional conductivity. The N junction boxes are connected via a busbar.

[0022] The last junction box in sequence is configured to house the second electronic device;

[0023] The last junction box has an EL test section near the conductor, through which the conductor passes and is electrically connected to the first electrode of the second electronic device.

[0024] The beneficial effects of this utility model are:

[0025] 1. In this structure, a second electronic device with unidirectional conductivity is installed in addition to the conventional first electronic device, thereby preventing the current from flowing back.

[0026] 2. The conductive elements in this structure enable EL testing of the junction box without disassembling it.

[0027] 3. The PCB design makes the circuit layout more compact and stable, reduces costs, and improves the overall performance of the photovoltaic bypass protection module and junction box assembly.

[0028] 4. The first and second conductive modules in this structure are made of PCB board, which not only realizes the integration of circuit, but also facilitates the installation and connection of the first and second electronic components, thereby improving production efficiency.

[0029] 5. By setting the fifth and sixth conductive areas as the output terminal and EL test terminal respectively, the function of the photovoltaic bypass protection module is made clearer and it is easier to connect to external photovoltaic modules and electrical detection power supplies, thus improving the ease of use. Attached Figure Description

[0030] Figure 1 This is an exploded structural diagram of the photovoltaic bypass protection module according to an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the structure of the photovoltaic bypass protection module according to an embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the structure of the conductor of the photovoltaic bypass protection module according to an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the structure of the conductor of the photovoltaic bypass protection module according to an embodiment of this application.

[0034] Figure 5 This is a schematic diagram of the third embodiment of the conductor of the photovoltaic bypass protection module in this application.

[0035] Figure 6 This is a schematic diagram of the junction box assembly according to an embodiment of this application.

[0036] Figure 7 This is a structural schematic diagram of the junction box assembly from another perspective, representing an embodiment of this application.

[0037] Figure 8 This is a schematic diagram showing the first and second electronic devices connected to multiple solar cell strings in the photovoltaic bypass protection module of this application embodiment.

[0038] The components in the diagram are labeled as follows: First electronic device 1, First pin 111, Second pin 112, First conductive area 121, Second conductive area 122, First busbar soldering area 131, Second busbar soldering area 132, Second electronic device 2, Third pin 211, Fourth pin 212, Third conductive area 221, Fourth conductive area 222, PCB board 3, Fifth conductive area 321, Sixth conductive area 322, Solar cell sub-string 5, Conductor 6, Connector 61, First end 61a, Second end 61b, Cable 62, Third end 62a, Fourth end 62b, Junction box 100, Last junction box 100a. Detailed Implementation

[0039] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, an embodiment of this application discloses a photovoltaic bypass protection module, including N groups of first electronic devices 1 with unidirectional conductivity and bypass protection function, wherein N≥1, for example, N=1,3,5,10 or other positive integers. The N groups of first electronic devices 1 are connected in series with each other. The first electronic devices 1 are configured to be connected in parallel with the solar cell sub-string 5. A second electronic device 2 with anti-reverse current function is connected in series with the N groups of first electronic devices 1. The first electrode of the second electronic device 2 is configured to be electrically connected to the second electrode of the series circuit composed of the N groups of first electronic devices 1. The module also includes a conductor 6, one end of which is electrically connected to the first electrode of the second electronic device 2, and the other end of which is electrically connected to an external detection power supply.

[0041] In practical use, multiple first electronic devices 1 and second electronic devices 2 are installed in the junction box 100, with each first electronic device 1 and second electronic device 2 connected in series. Each first electronic device 1 can be connected in parallel to the solar cell sub-string 5, and the second electrode of the second electronic device 2 is electrically connected to the external cable 62. The second electronic device 2 is specifically designed to prevent reverse current flow. That is, multiple first electronic devices 1 are used to form a conventional bypass module. When a cell in the solar cell sub-string 5 experiences current mismatch due to shading, damage, or performance degradation, the bypass module can provide a low-resistance bypass path for that cell, allowing the current to bypass the faulty cell and continue flowing, while the current can pass through the second electronic device 2 in the forward direction. At the same time, the second electronic device 2 also prevents reverse current from flowing, thus protecting the circuit.

[0042] When EL testing is required, the conductor 6 is connected to an external power supply to provide test voltage to the first electronic device 1, the second electronic device 2, and the solar cell sub-string 5, thereby enabling the testing of the solar panel's performance and quality. Since the conductor 6 is directly connected to the first electrode of the second electronic device 2, testing can be performed without disassembling the junction box 100, improving testing convenience. Furthermore, the placement of the conductor 6 does not affect the normal operation of the photovoltaic bypass protection module.

[0043] Specifically, the conductor 6 can be one of the following three specific embodiments:

[0044] Example 1: As Figure 3 As shown, the conductor 6 is a connector 61. The first end 61a of the connector 61 is electrically connected to the first electrode of the second electronic device 2, and the second end 61b of the connector 61 is electrically connected to the power supply for EL detection.

[0045] During the actual test, the second end 61b of connector 61 is connected to an external EL detection power supply to provide test voltage for the first electronic device 1, the second electronic device 2 and the solar cell sub-string 5. The connector 61 and the external EL detection power supply can be connected by plugging or other means.

[0046] Example 2: The conductor 6 is a cable 62, with a third end 62a and a fourth end 62b at its two ends. The third end 62a of the cable 62 is electrically connected to the first electrode of the second electronic device 2, and the fourth end 62b of the cable 62 is used to electrically connect to an external detection power supply.

[0047] In specific testing, the fourth end 62b of cable 62 is connected to an external EL detection power supply to provide test voltage for the first electronic device 1, the second electronic device 2, and the solar cell sub-string 5, thereby detecting the performance and quality of the solar panel. The connection between cable 62 and the external EL detection power supply can be achieved through clamping, soldering, or other methods.

[0048] Example 3: Figure 2 and Figure 4 As shown, the conductor 6 includes a cable 62 and a connector 61. The third end 62a of the cable 62 is electrically connected to the first electrode of the second electronic device 2, the fourth end 62b of the cable 62 is electrically connected to the first end 61a of the connector 61, and the second end 61b of the connector 61 is used to be electrically connected to an external detection power supply.

[0049] In specific testing, the second end 61b of connector 61 is connected to an external EL detection power supply to provide test voltage for the first electronic device 1, the second electronic device 2, and the solar cell sub-string 5. Connector 61 and the external EL detection power supply can be connected via plug-in or other methods. In this embodiment, cable 62 and connector 61 are used simultaneously, further improving the convenience and flexibility of the test. A stable connection can be achieved between cable 62 and connector 61 via plug-in, threaded connection, or other methods, ensuring the stability of current transmission during testing.

[0050] In the three embodiments described above, during EL testing, the operator can choose to connect to the external testing power supply using connector 61 or cable 62, depending on actual needs. For example, if the testing environment allows, connector 61 can be used for quick connection to improve testing efficiency; while when the external EL testing power supply is far away, cable 62 or a combination of cable 62 and connector 61 can be used for connection to achieve the purpose of long-distance testing.

[0051] In this embodiment, the first electronic device 1 includes a body of the first electronic device 1 and a first pin 111 and a second pin 112 electrically connected to the body of the first electronic device 1. The first pin 111 represents the first electrode of the first electronic device 1, and the second pin 112 represents the second electrode of the first electronic device 1.

[0052] The second electronic device 2 includes a body of the second electronic device 2 and a third pin 211 and a fourth pin 212 electrically connected to the body of the second electronic device 2. The third pin 211 represents the first electrode of the second electronic device 2, and the fourth pin 212 represents the second electrode of the second electronic device 2.

[0053] It should be explained that the first electronic device 1 and the second electronic device 2 mentioned above can be diodes. Specifically, the first electronic device 1 can be a Schottky diode, and the second electronic device 2 can be a MOS diode. Schottky diodes have lower forward voltage and faster switching speed, making them suitable for bypass protection in photovoltaic systems. MOS diodes, on the other hand, have lower conduction losses and zero reverse leakage current, making them more suitable as anti-reverse current protection components.

[0054] In this embodiment, a first conductive module for electrically connecting to a first electronic device 1 and a second conductive module for electrically connecting to a second electronic device 2 are also included. The number of first electronic devices 1 electrically connected to the first conductive module is one or more, such as one, two, three, four, etc. The number of second electronic devices 2 electrically connected to the second conductive module is one or more, such as one, two, three, four, etc.

[0055] Specifically, the first conductive module and the second conductive module can be electrically connected to the first electronic device 1 and the second electronic device 2 through welding, plugging, or other methods. The arrangement of the first conductive module and the second conductive module not only facilitates the installation and layout of the first electronic device 1 and the second electronic device 2, but also improves the integration and stability of the entire photovoltaic bypass protection module.

[0056] In this embodiment, the first conductive module and the second conductive module are PCB board 3, which makes the circuit layout more compact and stable. PCB board 3 is provided with a first conductive area 121, a second conductive area 122, a third conductive area 221, a fourth conductive area 222, a first busbar soldering area 131, and a second busbar soldering area 132. The first conductive area 121 is insulated from the second conductive area 122, the third conductive area 221 is insulated from the fourth conductive area 222, and the first busbar soldering area 131 is insulated from the second busbar soldering area 132, ensuring the safety and stability of the circuit.

[0057] In specific implementation, the first busbar welding area 131 is electrically connected to the first conductive area 121, the second busbar welding area (132) is electrically connected to the third conductive area (221), and the second conductive area (122) and the third conductive area (221) are electrically connected.

[0058] The first electrode of the first electronic device (1) is electrically connected to the first conductive region (121), the second electrode of the first electronic device (1) is electrically connected to the second conductive region (122), the first electrode of the second electronic device (2) is electrically connected to the third conductive region (221), and the second electrode of the second electronic device (2) is electrically connected to the fourth conductive region (222).

[0059] In this embodiment, a fifth conductive area 321 is also provided on the PCB board 3. The fifth conductive area 321 is electrically connected to the fourth conductive area 222. The fifth conductive area 321 is configured as an output terminal and is used to be electrically connected to an external photovoltaic module.

[0060] In this structure, the fifth conductive region 321 facilitates the electrical connection between the photovoltaic bypass protection module and the external photovoltaic module. As a dedicated output terminal, the fifth conductive region 321 not only clarifies its function but also makes the connection simpler and more direct, reducing the complexity of connecting with the external photovoltaic module. At the same time, the electrical connection between the fifth conductive region 321 and the fourth conductive region 222 ensures that the current can flow smoothly to the external photovoltaic module after passing through the second electronic device 2, thus guaranteeing the normal operation of the photovoltaic system.

[0061] In this embodiment, a sixth conductive area 322 is also provided on the PCB board 3. The sixth conductive area 322 is electrically connected to the third conductive area 221. The sixth conductive area 322 is configured as an EL test terminal and is used for electrical connection with an external EL detection power supply.

[0062] In this structure, the sixth conductive region 322 facilitates the electrical connection between the photovoltaic bypass protection module and the external EL testing power supply. The sixth conductive region 322, serving as a dedicated EL testing terminal, not only clarifies its function but also simplifies and directly improves the connection, enhancing the convenience of EL testing. Simultaneously, the electrical connection between the sixth conductive region 322 and the third conductive region 221 ensures that the test voltage can be accurately applied to the first electronic device 1, the second electronic device 2, and the solar cell sub-string 5, thereby guaranteeing the accuracy of the EL test.

[0063] In this embodiment, the conductor 6 is electrically connected to the sixth conductive area 322 through the lines on the PCB board 3, or the conductor 6 is electrically connected to the sixth conductive area 322 through the lines and vias on the PCB board 3.

[0064] Specifically, conductor 6 achieves a stable electrical connection with the sixth conductive area 322 through preset lines or vias on the PCB board 3. This design not only simplifies the circuit structure but also improves the stability and reliability of current transmission. During EL testing, the operator only needs to connect an external test power supply to conductor 6 to provide test voltage to the first electronic device 1, the second electronic device 2, and the solar cell sub-string 5 through the sixth conductive area 322, thereby enabling the testing of the performance and quality of the solar panel. This testing method eliminates the need to disassemble the junction box 100, greatly improving the convenience and efficiency of the test.

[0065] The present invention also discloses a junction box 100 assembly, including a junction box 100 and the aforementioned photovoltaic bypass protection module. The number of junction boxes 100 is N, and the N junction boxes 100 are configured to respectively house N groups of first electronic devices 1 with unidirectional conductivity. The N junction boxes 100 are connected via a busbar.

[0066] The last junction box 100a in sequence is configured to house the second electronic device 2;

[0067] The last junction box 100a is provided with an EL test section near the conductor 6, through which the conductor 6 passes and is electrically connected to the first electrode of the second electronic device 2.

[0068] Specifically, the aforementioned EL test section refers to the end of the junction box 100, which has a through hole for the conductor 6 to pass through, so that the conductor 6 can be electrically connected to the first electrode of the second electronic device 2.

[0069] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A photovoltaic bypass protection module comprising N groups of first electronic devices (1) with unidirectional conduction properties having a bypass protection function, wherein, N≥1, N groups of first electronic devices (1) are connected in series with each other, the first electronic device (1) is configured to be connected in parallel with the solar cell sub-string (5), and a second electronic device (2) with anti-reverse current function is connected in series with the N groups of first electronic devices (1), the first electrode of the second electronic device (2) is configured to be electrically connected with the second electrode of the series circuit composed of the N groups of first electronic devices (1), characterized in that: It also includes a conductor (6), one end of which is electrically connected to the first electrode of the second electronic device (2), and the other end of which is used to be electrically connected to an external detection power supply.

2. The photovoltaic bypass protection module of claim 1, wherein: The conductor (6) is a connector (61), the first end (61a) of the connector (61) is electrically connected to the first electrode of the second electronic device (2), and the second end (61b) of the connector (61) is electrically connected to the power supply for EL detection.

3. The photovoltaic bypass protection module of claim 1, wherein: The conductor (6) is a cable (62), with the two ends of the cable (62) being the third end (62a) and the fourth end (62b), respectively. The third end (62a) of the cable (62) is electrically connected to the first electrode of the second electronic device (2), and the fourth end (62b) of the cable (62) is used to be electrically connected to an external detection power supply.

4. The photovoltaic bypass protection module of claim 1, wherein: The conductor (6) includes a cable (62) and a connector (61). The third end (62a) of the cable (62) is electrically connected to the first electrode of the second electronic device (2), and the fourth end (62b) of the cable (62) is electrically connected to the first end (61a) of the connector (61). The second end (61b) of the connector (61) is used to be electrically connected to an external detection power supply.

5. The photovoltaic bypass protection module of claim 1, wherein: The first electronic device (1) includes a body of the first electronic device (1) and a first pin (111) and a second pin (112) electrically connected to the body of the first electronic device (1). The first pin (111) represents the first electrode of the first electronic device (1), and the second pin (112) represents the second electrode of the first electronic device (1). The second electronic device (2) includes a body of the second electronic device (2) and a third pin (211) and a fourth pin (212) electrically connected to the body of the second electronic device (2). The third pin (211) represents the first electrode of the second electronic device (2), and the fourth pin (212) represents the second electrode of the second electronic device (2).

6. The photovoltaic bypass protection module as described in claim 1, characterized in that: It also includes a first conductive module for electrically connecting to a first electronic device (1) and a second conductive module for electrically connecting to a second electronic device (2), wherein the number of first electronic devices (1) electrically connected to the first conductive module is one or more, and the number of second electronic devices (2) electrically connected to the second conductive module is one or more.

7. The photovoltaic bypass protection module of claim 6, wherein: The first conductive module and the second conductive module are PCB boards (3), and the PCB board (3) is provided with a first conductive area (121), a second conductive area (122), a third conductive area (221), a fourth conductive area (222), a first busbar soldering area (131) and a second busbar soldering area (132); The first busbar welding area (131) and the second busbar welding area (132) are insulated from each other, the third conductive area (221) and the fourth conductive area (222) are insulated from each other, and the first conductive area (121) and the second conductive area (122) are insulated from each other. The first busbar welding area (131) is electrically connected to the first conductive area (121), the second busbar welding area (132) is electrically connected to the third conductive area (221), and the second conductive area (122) and the third conductive area (221) are electrically connected. The first electrode of the first electronic device (1) is electrically connected to the first conductive region (121), the second electrode of the first electronic device (1) is electrically connected to the second conductive region (122), the first electrode of the second electronic device (2) is electrically connected to the third conductive region (221), and the second electrode of the second electronic device (2) is electrically connected to the fourth conductive region (222).

8. The photovoltaic bypass protection module of claim 7, wherein: It also includes a fifth conductive area (321) disposed on the PCB board (3), the fifth conductive area (321) being electrically connected to the fourth conductive area (222), the fifth conductive area (321) being configured as an output terminal, and the fifth conductive area (321) being used for electrical connection with an external photovoltaic module.

9. The photovoltaic bypass protection module of claim 7, wherein: It also includes a sixth conductive area (322) disposed on the PCB board (3), the sixth conductive area (322) being electrically connected to the third conductive area (221), the sixth conductive area (322) being configured as an EL test terminal, and the sixth conductive area (322) being electrically connected to one end of the conductor (6).

10. The photovoltaic bypass protection module of claim 9, wherein: The conductor (6) and the sixth conductive area (322) are electrically connected through lines on the PCB board (3); Alternatively, the conductor (6) and the sixth conductive area (322) can be electrically connected to the sixth conductive area (322) through the lines and vias on the PCB board (3).

11. A junction box (100) assembly comprising a junction box (100) and a photovoltaic bypass protection module according to any one of claims 1 to 9, characterized in that: The number of junction boxes (100) is N, and the N junction boxes (100) are configured to respectively house N groups of first electronic devices (1) with unidirectional conductivity. The N junction boxes (100) are connected by a busbar. The last junction box (100a) arranged in sequence is configured to house the second electronic device (2); The last junction box (100a) is provided with an EL test section at the end near the conductor (6) through which the conductor (6) passes and is electrically connected to the first electrode of the second electronic device (2).

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