Photovoltaic diode and junction box

Abstract

The invention provides a photovoltaic diode and a junction box, and the photovoltaic diode comprises a positive electrode assembly which comprises a positive electrode metal plate and a positive electrode ceramic plate disposed at a first side of the positive electrode metal plate; the negative electrode assembly and the positive electrode assembly are arranged in a spaced mode in the first preset direction, and the negative electrode assembly comprises a negative electrode metal plate and a negative electrode ceramic plate arranged on the first side of the negative electrode metal plate; the chip is arranged on the positive electrode metal plate, one end of the connecting piece is connected with the chip, and the other end of the connecting piece is connected with the negative electrode metal plate; or, the chip is arranged on the negative electrode metal plate, one end of the connecting piece is connected with the chip, and the other end of the connecting piece is connected with the positive electrode metal plate; wherein the first predetermined direction is the length direction of the positive electrode assembly and the negative electrode assembly, so as to solve the problem that a photovoltaic diode in the prior art cannot meet the relatively high heat dissipation requirement corresponding to large current and high power and the stress exceeding the bearing upper limit.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a photovoltaic diode and a junction box. Background Art

[0002] At present, solar photovoltaic power generation technology has become one of the most promising renewable technologies. It mainly generates electricity by storing solar radiation energy in solar cells. Compared with other power generation systems, the process of generating electricity is simpler. It mainly generates electricity by converting photons in sunlight energy into electrons. It can not only protect the environment, but also prevent waste of resources. At the same time, since sunlight is widely distributed, it is very convenient to develop and utilize it.

[0003] During the operation of a solar photovoltaic power generation system, if one of the cells is blocked, this cell will not generate electricity but will act as a load to consume the electricity generated by other cells. If this lasts for a long time, it will inevitably cause the component to burn out. Therefore, in order to prevent the component from being damaged, a bypass diode must be connected in parallel at both ends to allow current to flow through the diode in the forward direction when it is blocked, thereby protecting the component.

[0004] Photovoltaic bypass diodes are installed in the junction box to protect the components from damage when the spot effect occurs. When the diode is activated, the short-circuit current of the component flows through the diode in the forward direction, and the diode will generate a temperature rise. In the early days, when the component power was small, conventional diodes could meet the temperature rise conditions, but with the development of the industry, major component manufacturers have launched high-power components to reduce electricity costs.

[0005] As the short-circuit current gradually increases, the requirements for diode performance become higher and higher. The photovoltaic diodes in the existing technology cannot meet the higher heat dissipation requirements corresponding to large current and high power and the stress that exceeds the upper limit. Excessive temperature will cause the working efficiency of the photovoltaic diode to decrease, and excessive stress will cause damage to the diode and even cause safety accidents. Summary of the invention

[0006] The main purpose of the present invention is to provide a photovoltaic diode and a junction box to solve the problem that the photovoltaic diode in the prior art cannot meet the higher heat dissipation requirements corresponding to large current and high power and the stress exceeds the upper limit.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a photovoltaic diode, comprising: a positive electrode assembly, the positive electrode assembly comprising a positive metal plate and a positive ceramic plate arranged on a first side of the positive metal plate; a negative electrode assembly, the negative electrode assembly and the positive electrode assembly are arranged at intervals along a first predetermined direction, the negative electrode assembly comprises a negative metal plate and a negative ceramic plate arranged on a first side of the negative metal plate; a chip and a connector, the chip is arranged on the positive metal plate, one end of the connector is connected to the chip, and the other end of the connector is connected to the negative metal plate; or, the chip is arranged on the negative metal plate, one end of the connector is connected to the chip, and the other end of the connector is connected to the positive metal plate; wherein the first predetermined direction is the length direction of the positive electrode assembly and the negative electrode assembly.

[0008] Furthermore, the positive metal plate and the positive ceramic plate are both rectangular plates, the positive ceramic plate is provided with a positive connection avoidance port, and the positive connection avoidance port is located at the end of the positive ceramic plate away from the negative ceramic plate; and / or the negative metal plate and the negative ceramic plate are both rectangular plates, the negative ceramic plate is provided with a negative connection avoidance port, and the negative connection avoidance port is located at the end of the negative ceramic plate away from the positive ceramic plate; and / or the positive metal plate is a copper plate; and / or the negative metal plate is a copper plate.

[0009] Furthermore, the positive electrode assembly is connected to the installation position through multiple first fasteners, and multiple first fastening through holes are arranged at intervals on the positive electrode assembly, and each first fastening through hole passes through the positive electrode metal plate and the positive electrode ceramic plate; and / or the negative electrode assembly is connected to the installation position through multiple second fasteners, and multiple second fastening through holes are arranged at intervals on the negative electrode assembly, and each second fastening through hole passes through the negative electrode metal plate and the negative electrode ceramic plate.

[0010] Furthermore, the photovoltaic diode includes: an anti-foolproof structure, wherein the anti-foolproof structure is arranged on the positive electrode assembly and is located on one side of the width direction of the positive electrode assembly; or the anti-foolproof structure is arranged on the negative electrode assembly and is located on one side of the width direction of the negative electrode assembly; and / or a first tin block, a first tin storage tank for placing the first tin block is arranged on the second side of the positive metal plate; and / or a second tin block, a second tin storage tank for placing the second tin block is arranged on the second side of the negative metal plate.

[0011] Furthermore, a positive electrode welding through hole is provided on the positive electrode assembly, and the positive electrode welding through hole penetrates the positive electrode metal plate and the positive electrode ceramic plate; a negative electrode welding through hole is provided on the negative electrode assembly, and the negative electrode welding through hole penetrates the negative electrode metal plate and the negative electrode ceramic plate.

[0012] Furthermore, there are multiple chips, which are spaced apart along a second predetermined direction; there are multiple connectors, which are arranged one-to-one with the multiple chips; wherein the second predetermined direction is the width direction of the positive electrode assembly and the negative electrode assembly.

[0013] Furthermore, the positive metal plate and the negative metal plate are parallel to each other, the second side of the positive metal plate is flush with the second side of the negative metal plate, and the chip is parallel to the positive metal plate and the negative metal plate; the connecting member includes a first connecting plate, a second connecting plate and a third connecting plate connected in sequence, the first connecting plate and the third connecting plate are parallel to each other, the first connecting plate is connected to the chip, and the other end of the third connecting plate is connected to the positive metal plate or the negative metal plate.

[0014] Furthermore, the photovoltaic diode also includes a plastic package, at least a portion of which covers the chip and the connector.

[0015] Furthermore, the plastic sealing part is integrally formed by an injection molding process, and the plastic sealing part includes: a first plastic sealing part, which is arranged on the second side of the positive metal plate and the second side of the negative metal plate; and a second plastic sealing part, which is arranged on the side of the positive ceramic plate away from the positive metal plate and the side of the negative ceramic plate away from the negative metal plate.

[0016] According to another aspect of the present invention, a junction box is provided, comprising a box body and a photovoltaic diode arranged in the box body, wherein the photovoltaic diode is the photovoltaic diode described above.

[0017] Applying the technical solution of the present invention, the photovoltaic diode of the present invention includes: a positive electrode assembly, the positive electrode assembly includes a positive metal plate and a positive ceramic plate arranged on a first side of the positive metal plate; a negative electrode assembly, the negative electrode assembly and the positive electrode assembly are arranged at intervals along a first predetermined direction, the negative electrode assembly includes a negative metal plate and a negative ceramic plate arranged on a first side of the negative metal plate; a chip and a connector, the chip is arranged on the positive metal plate, one end of the connector is connected to the chip, and the other end of the connector is connected to the negative metal plate; or, the chip is arranged on the negative metal plate, one end of the connector is connected to the chip, and the other end of the connector is connected to the positive metal plate; wherein the first predetermined direction is the length direction of the positive electrode assembly and the negative electrode assembly. In this way, the metal plate and ceramic plate in the positive electrode assembly and negative electrode assembly of the photovoltaic diode of the present invention can be formed into a composite material with high thermal conductivity, high electrical conductivity, high insulation strength, high mechanical strength and low expansion properties through high-temperature melting and diffusion processes, which solves the problem that the photovoltaic diode in the prior art cannot meet the high heat dissipation requirements corresponding to high current and high power and the stress exceeding the upper limit, significantly improves the insulation performance of the photovoltaic diode, and improves the safety and reliability of the photovoltaic power generation system. In a large-scale photovoltaic power generation system, it can reduce the maintenance frequency of the photovoltaic power generation system, extend the service life of the photovoltaic power generation system, and play an important role in reducing the operating cost of the photovoltaic power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of an embodiment of a photovoltaic diode according to the present invention in one direction is shown;

[0020] Figure 2 Shows Figure 1 The schematic diagram of the structure of the photovoltaic diode shown in another direction;

[0021] Figure 3 Shows Figure 1 A top view of a photovoltaic diode is shown;

[0022] Figure 4 Shows Figure 1 A bottom view of a photovoltaic diode is shown;

[0023] Figure 5 Shows Figure 4 A cross-sectional view of the photovoltaic diode shown along the AA direction;

[0024] Figure 6 Shows Figure 1 A front view of a photovoltaic diode shown;

[0025] Figure 7 Shows Figure 1 The photovoltaic diode shown is a schematic diagram of the structure in one direction when the plastic package is not included;

[0026] Figure 8 Shows Figure 1 The photovoltaic diode shown is a schematic diagram of the structure in another direction when the plastic package is not included;

[0027] Fig. 9 Shows Figure 1 The photovoltaic diode shown is a side view without the plastic package;

[0028] Fig.10 Shows Fig. 9 A partial enlarged view of point B of the photovoltaic diode shown.

[0029] The above drawings include the following reference numerals:

[0030] 1. Positive electrode assembly; 11. Positive electrode metal plate; 12. Positive electrode ceramic plate; 121. Positive electrode connection avoidance port; 13. First fastening through hole; 14. Positive electrode welding through hole;

[0031] 2. Negative electrode assembly; 21. Negative electrode metal plate; 22. Negative electrode ceramic plate; 221. Negative electrode connection avoidance port; 23. Second fastening through hole; 24. Negative electrode welding through hole;

[0032] 3. Chip;

[0033] 4. Connecting piece; 41. First connecting plate; 42. Second connecting plate; 43. Third connecting plate;

[0034] 5. Foolproof structure;

[0035] 6. Plastic sealing part; 61. First plastic sealing part; 62. Second plastic sealing part;

[0036] 7. The first tin block;

[0037] 8. The second tin block. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] like Figures 1 to 10 As shown, the present invention provides a photovoltaic diode, comprising: a positive electrode assembly 1, the positive electrode assembly 1 comprising a positive electrode metal plate 11 and a positive electrode ceramic plate 12 arranged on a first side of the positive electrode metal plate 11; a negative electrode assembly 2, the negative electrode assembly 2 and the positive electrode assembly 1 are arranged at intervals along a first predetermined direction, the negative electrode assembly 2 comprises a negative electrode metal plate 21 and a negative electrode ceramic plate 22 arranged on a first side of the negative electrode metal plate 21; a chip 3 and a connector 4, the chip 3 is arranged on the positive electrode metal plate 11, one end of the connector 4 is connected to the chip 3, and the other end of the connector 4 is connected to the negative electrode metal plate 21; or, the chip 3 is arranged on the negative electrode metal plate 21, one end of the connector 4 is connected to the chip 3, and the other end of the connector 4 is connected to the positive electrode metal plate 11; wherein the first predetermined direction is the length direction of the positive electrode assembly 1 and the negative electrode assembly 2.

[0040] In this way, the metal plate and ceramic plate in the positive electrode assembly 1 and the negative electrode assembly 2 of the photovoltaic diode of the present invention can be formed through high-temperature melting and diffusion processes to form a composite material with high thermal conductivity, high electrical conductivity, high insulation strength, high mechanical strength and low expansion properties, etc., which solves the problem that the photovoltaic diode in the prior art cannot meet the high heat dissipation requirements corresponding to high current and high power and the stress exceeding the upper limit, significantly improves the insulation performance of the photovoltaic diode, and improves the safety and reliability of the photovoltaic power generation system. In a large-scale photovoltaic power generation system, it can reduce the maintenance frequency of the photovoltaic power generation system, extend the service life of the photovoltaic power generation system, and play an important role in reducing the operating cost of the photovoltaic power generation system.

[0041] Specifically, the photovoltaic diode of the present invention is applied to a crystalline silicon / amorphous silicon photovoltaic power generation system, and the positive metal plate 11 and the negative metal plate 21 are both copper plates.

[0042] like Figures 1 to 10 As shown, the positive metal plate 11 and the positive ceramic plate 12 are both rectangular plates, and the positive ceramic plate 12 is provided with a positive connection avoidance opening 121, and the positive connection avoidance opening 121 is located at the end of the positive ceramic plate 12 away from the negative ceramic plate 22; and / or the negative metal plate 21 and the negative ceramic plate 22 are both rectangular plates, and the negative ceramic plate 22 is provided with a negative connection avoidance opening 221, and the negative connection avoidance opening 221 is located at the end of the negative ceramic plate 22 away from the positive ceramic plate 12.

[0043] In this way, by respectively setting the positive connection avoidance port 121 and the negative connection avoidance port 221 on the positive ceramic plate 12 and the negative ceramic plate 22, not only the connection process between the positive metal plate 11 and the negative metal plate 21 and the corresponding external wiring harness is simplified, but also the accuracy and reliability of the connection are ensured.

[0044] In the photovoltaic diode of the present invention, the thickness ratio of the positive metal plate 11 to the positive ceramic plate 12 is 0.8 to 1.2; and / or the thickness ratio of the negative metal plate 21 to the negative ceramic plate 22 is 0.8 to 1.2.

[0045] Specifically, except for setting the positive electrode connection avoidance port 121, the outer dimensions of the positive electrode metal plate 11 are the same as the outer dimensions of the positive electrode ceramic plate 12, and the ratio of the thickness of the positive electrode metal plate 11 to the thickness of the positive electrode ceramic plate 12 is 1; except for setting the negative electrode connection avoidance port 221, the outer dimensions of the negative electrode metal plate 21 are the same as the outer dimensions of the negative electrode ceramic plate 22, and the ratio of the thickness of the negative electrode metal plate 21 to the thickness of the negative electrode ceramic plate 22 is 1.

[0046] In terms of heat dissipation performance, ceramic materials have good thermal conductivity and can effectively help the chip dissipate heat. Metal materials (such as copper) have higher thermal conductivity and can quickly transfer the heat generated by the photovoltaic diode to the ceramic plate and further dissipate it into the environment. By adjusting the thickness ratio of the two, the heat dissipation path can be optimized while ensuring structural strength, ensuring that the temperature of the photovoltaic diode is controlled within a safe range under high current and high power conditions.

[0047] In terms of stress distribution control, metals and ceramics have different thermal expansion coefficients, and the stress difference between the two may cause structural damage when the temperature changes. The appropriate thickness ratio helps to reduce this difference, control stress distribution, prevent cracks or failures during temperature cycles, and improve the reliability and life of photovoltaic diodes.

[0048] In terms of electrical performance stability, the metal plate is a conductor of current, and the thickness of the metal plate directly affects the flow and loss of current. The ceramic plate provides electrical insulation and mechanical support. The appropriate thickness ratio can ensure low impedance and good electrical performance under high current, while maintaining sufficient mechanical strength and insulation performance.

[0049] In terms of cost-performance balance, metal materials are relatively expensive, while ceramics are relatively cheap but have better thermal conductivity. By properly adjusting the thickness ratio, a balance can be found between the low cost and high performance of photovoltaic diodes, achieving a more economical design.

[0050] Therefore, the present invention can find the best solution between heat dissipation, stress control, electrical performance and cost by setting the thickness ratio of the positive metal plate to the positive ceramic plate and the negative metal plate to the negative ceramic plate to meet the performance requirements of photovoltaic diodes under high current and high power applications.

[0051] like Figures 1 to 10 As shown, the positive electrode assembly 1 is connected to the installation position through multiple first fasteners, and multiple first fastening through holes 13 are arranged at intervals on the positive electrode assembly 1, and each first fastening through hole 13 is arranged through the positive metal plate 11 and the positive ceramic plate 12; and / or the negative electrode assembly 2 is connected to the installation position through multiple second fasteners, and multiple second fastening through holes 23 are arranged at intervals on the negative electrode assembly 2, and each second fastening through hole 23 is arranged through the negative metal plate 21 and the negative ceramic plate 22.

[0052] In this way, the positive electrode assembly 1 and the negative electrode assembly 2 can be stably installed on the box body of the junction box of the photovoltaic power generation system, and the structural integrity and electrical performance stability of the photovoltaic diode can be maintained even in harsh outdoor environments, thereby ensuring the wind and earthquake resistance of the photovoltaic diode and extending the service life of the photovoltaic diode.

[0053] like Figures 1 to 10 As shown, the photovoltaic diode includes: an anti-foolproof structure 5, wherein the anti-foolproof structure 5 is arranged on the positive electrode component 1 and is located on one side of the width direction of the positive electrode component 1; or the anti-foolproof structure 5 is arranged on the negative electrode component 2 and is located on one side of the width direction of the negative electrode component 2; and / or a first tin block 7, and a first tin storage tank for placing the first tin block 7 is arranged on the second side of the positive metal plate 11; and / or a second tin block 8, and a second tin storage tank for placing the second tin block 8 is arranged on the second side of the negative metal plate 21.

[0054] The present invention sets a foolproof structure 5 on the photovoltaic diode, and the foolproof structure 5 can be located on any side of the width direction of the positive electrode assembly 1 or the negative electrode assembly 2, so as to intuitively guide the installation personnel to perform the installation action, significantly reducing the possible erroneous operation of the photovoltaic diode during the installation process, improving the installation efficiency and safety of the photovoltaic diode, and also improving the installation efficiency of the photovoltaic power generation system, reducing the on-site debugging time required due to installation errors. For large-scale photovoltaic power generation systems, this feature means a significant cost saving. At the same time, it also improves the safety of on-site workers and reduces electrical failures or safety risks caused by improper installation, which is a more humane consideration in the photovoltaic power generation system.

[0055] The present invention respectively arranges a first tin block 7 and a second tin block 8 on the positive metal plate 11 and the negative metal plate 21 of the photovoltaic diode to optimize the electrical connection between the positive metal plate 11 and the negative metal plate 21 and the corresponding circuit board, improves the stability and reliability of the connection, ensures the efficient transmission of current between the positive metal plate 11 and the negative metal plate 21 and the corresponding circuit board, reduces energy loss, effectively dissipates heat, reduces the operating temperature of the photovoltaic diode, extends the service life of the photovoltaic diode, reduces the maintenance requirements of the diode for photovoltaic use, and improves the overall reliability and economic benefits of the photovoltaic power generation system.

[0056] Specifically, the first tin block 7 and the second tin block 8 are both rectangular blocks, and the first tin storage tank for installing the first tin block 7 is located on the side of the multiple first fastening through holes 13 on the positive electrode component 1 close to the negative electrode component 2, and the second tin storage tank for installing the second tin block 8 is located on the side of the multiple second fastening through holes 23 on the negative electrode component 2 close to the positive electrode component 1, and the first tin storage tank and the second tin storage tank are both rectangular tanks, and their specific size and position settings take into account thermal expansion and stress changes during cooling, ensuring the long-term reliability of the corresponding connection.

[0057] like Figures 1 to 10 As shown, the positive electrode assembly 1 is provided with a positive electrode welding through hole 14, which passes through the positive electrode metal plate 11 and the positive electrode ceramic plate 12; the negative electrode assembly 2 is provided with a negative electrode welding through hole 24, which passes through the negative electrode metal plate 21 and the negative electrode ceramic plate 22.

[0058] In this way, by respectively setting the positive electrode welding through hole 14 and the negative electrode welding through hole 24 on the positive electrode assembly 1 and the negative electrode assembly 2, the positive electrode welding through hole 14 is located on the side of the first tin storage tank on the positive electrode assembly 1 away from the multiple first fastening through holes 13, and the negative electrode welding through hole 24 is located on the side of the second tin storage tank on the negative electrode assembly 2 away from the multiple second fastening through holes 23. The positions of the positive electrode welding through hole 14 and the negative electrode welding through hole 24 need to be precisely positioned to ensure the tightness of the connection during the welding process, and to ensure the stable and accurate connection between the positive electrode assembly 1 and the negative electrode assembly 2 and the corresponding welding parts, which not only improves the electrical performance, but also reduces the resistance at the positive electrode welding through hole 14 and the negative electrode welding through hole 24, thereby reducing the energy loss of the photovoltaic diode.

[0059] Meanwhile, the positive electrode welding through hole 14 and the negative electrode welding through hole 24 are both rectangular parallelepiped holes, and their specific sizes need to match the sizes of the corresponding welding parts to prevent loose connections during the welding process.

[0060] In summary, the corresponding settings of the positive electrode assembly 1 and the negative electrode assembly 2 of the present invention together constitute a stable structure of the photovoltaic diode, ensuring the smooth conduction of current in the photovoltaic power generation system. Even under extreme weather conditions, the reliability and stability of the connection between the photovoltaic diode and the corresponding components can be maintained, thereby improving the overall performance of the photovoltaic power generation system.

[0061] Optionally, the number of the chips 3 is one or more, and the number of the corresponding connecting members 4 is also one or more.

[0062] like Figure 5 and Figures 7 to 10 As shown, there are multiple chips 3, and the multiple chips 3 are arranged at intervals along the second predetermined direction; there are multiple connectors 4, and the multiple connectors 4 are arranged one-to-one corresponding to the multiple chips 3; wherein the second predetermined direction is the width direction of the positive electrode assembly 1 and the negative electrode assembly 2.

[0063] In this way, not only the heat dissipation efficiency of the chip 3 is improved, but also the stable electrical connection between the connector 4 and the chip 3 and the positive metal plate 11 and the negative metal plate 21 is ensured, the current path is optimized, the current handling capacity and heat dissipation efficiency are significantly improved, and the overall performance and service life of the photovoltaic diode are improved. The key to improving the operating efficiency of the photovoltaic power generation system is to play an important role in improving the overall performance of the photovoltaic power generation system and reducing energy loss.

[0064] like Fig.10As shown, the positive metal plate 11 and the negative metal plate 21 are parallel to each other, the second side of the positive metal plate 11 is flush with the second side of the negative metal plate 21, and the chip 3 is parallel to the positive metal plate 11 and the negative metal plate 21; the connecting member 4 includes a first connecting plate 41, a second connecting plate 42 and a third connecting plate 43 connected in sequence, the first connecting plate 41 and the third connecting plate 43 are parallel to each other, the first connecting plate 41 is connected to the chip 3, and the other end of the third connecting plate 43 is connected to the positive metal plate 11 or the negative metal plate 21.

[0065] In this way, by setting the connecting member 4 to a structure including a first connecting plate 41, a second connecting plate 42 and a third connecting plate 43 connected in sequence, the first connecting plate 41 is connected to the chip 3, the third connecting plate 43 is connected to the positive metal plate 11 or the negative metal plate 21, and the second connecting plate 42 is responsible for the transition connection between the first connecting plate 41 and the third connecting plate 43, thereby ensuring smooth conduction of current between the chip 3 and the positive metal plate 11 and the negative metal plate 21, and at the same time ensuring sufficient mechanical strength between the chip 3 and the positive metal plate 11 and the negative metal plate 21.

[0066] In an embodiment of the present invention not shown, the chip 3 is disposed on the positive metal plate 11 , the first connecting plate 41 is connected to the chip 3 , and the other end of the third connecting plate 43 is connected to the negative metal plate 21 .

[0067] In the present invention Figures 1 to 9 In the illustrated embodiment, the chip 3 is disposed on the negative metal plate 21 , the first connecting plate 41 is connected to the chip 3 , and the other end of the third connecting plate 43 is connected to the positive metal plate 11 .

[0068] like Figures 1 to 6 As shown, the photovoltaic diode further includes a plastic package 6 , at least a portion of which covers the chip 3 and the connector 4 .

[0069] like Figures 1 to 6 As shown, the plastic sealing part 6 is integrally formed by an injection molding process, and the plastic sealing part 6 includes: a first plastic sealing part 61, which is arranged on the second side of the positive metal plate 11 and the second side of the negative metal plate 21; a second plastic sealing part 62, and the second plastic sealing part 62 is arranged on the side of the positive ceramic plate 12 away from the positive metal plate 11 and the side of the negative ceramic plate 22 away from the negative metal plate 21.

[0070] In this way, the stable connection between the chip 3 and the positive metal plate 11 and the negative metal plate 21 is further ensured.

[0071] Specifically, the present invention assembles the positive electrode assembly 1 and the negative electrode assembly 2, the chip 3 and the connector 4 as a carrier, and then packages them through the plastic packaging member 6 to form a photovoltaic diode; wherein the positive electrode assembly 1 and the negative electrode assembly 2 can both be called copper-clad ceramics.

[0072] The present invention further provides a junction box, comprising a box body and a photovoltaic diode arranged on the box body, wherein the photovoltaic diode is the photovoltaic diode mentioned above.

[0073] Specifically, the junction box is a part of the photovoltaic power generation system.

[0074] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0075] The photovoltaic diode of the present invention includes: a positive electrode assembly 1, the positive electrode assembly 1 includes a positive electrode metal plate 11 and a positive electrode ceramic plate 12 arranged on a first side of the positive electrode metal plate 11; a negative electrode assembly 2, the negative electrode assembly 2 and the positive electrode assembly 1 are arranged at intervals along a first predetermined direction, the negative electrode assembly 2 includes a negative electrode metal plate 21 and a negative electrode ceramic plate 22 arranged on a first side of the negative electrode metal plate 21; a chip 3 and a connector 4, the chip 3 is arranged on the positive electrode metal plate 11, one end of the connector 4 is connected to the chip 3, and the other end of the connector 4 is connected to the negative electrode plate 21; or, the chip 3 is arranged on the negative electrode metal plate 21, one end of the connector 4 is connected to the chip 3, and the other end of the connector 4 is connected to the positive electrode plate 11; wherein the first predetermined direction is the length direction of the positive electrode assembly 1 and the negative electrode assembly 2. In this way, the metal plate and ceramic plate in the positive electrode assembly 1 and the negative electrode assembly 2 of the photovoltaic diode of the present invention can be formed through high-temperature melting and diffusion processes to form a composite material with high thermal conductivity, high electrical conductivity, high insulation strength, high mechanical strength and low expansion properties, etc., which solves the problem that the photovoltaic diode in the prior art cannot meet the high heat dissipation requirements corresponding to high current and high power and the stress exceeding the upper limit, significantly improves the insulation performance of the photovoltaic diode, and improves the safety and reliability of the photovoltaic power generation system. In a large-scale photovoltaic power generation system, it can reduce the maintenance frequency of the photovoltaic power generation system, extend the service life of the photovoltaic power generation system, and play an important role in reducing the operating cost of the photovoltaic power generation system.

[0076] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0077] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0078] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic diode, characterized in that: include: A positive electrode assembly (1), the positive electrode assembly (1) comprising a positive electrode metal plate (11) and a positive electrode ceramic plate (12) arranged on a first side of the positive electrode metal plate (11); A negative electrode assembly (2), the negative electrode assembly (2) and the positive electrode assembly (1) are arranged at intervals along a first predetermined direction, the negative electrode assembly (2) comprising a negative electrode metal plate (21) and a negative electrode ceramic plate (22) arranged on a first side of the negative electrode metal plate (21); A chip (3) and a connector (4), wherein the chip (3) is arranged on the positive metal plate (11), one end of the connector (4) is connected to the chip (3), and the other end of the connector (4) is connected to the negative metal plate (21); or, the chip (3) is arranged on the negative metal plate (21), one end of the connector (4) is connected to the chip (3), and the other end of the connector (4) is connected to the positive metal plate (11); Wherein, the first predetermined direction is the length direction of the positive electrode assembly (1) and the negative electrode assembly (2).

2. The photovoltaic diode according to claim 1, characterized in that: The positive electrode metal plate (11) and the positive electrode ceramic plate (12) are both rectangular plates, the positive electrode ceramic plate (12) is provided with a positive electrode connection avoidance opening (121), and the positive electrode connection avoidance opening (121) is located at an end of the positive electrode ceramic plate (12) away from the negative electrode ceramic plate (22); and / or The negative electrode metal plate (21) and the negative electrode ceramic plate (22) are both rectangular plates, the negative electrode ceramic plate (22) is provided with a negative electrode connection avoidance opening (221), and the negative electrode connection avoidance opening (221) is located at an end of the negative electrode ceramic plate (22) away from the positive electrode ceramic plate (12); and / or The positive metal plate (11) is a copper plate; and / or The negative electrode metal plate (21) is a copper plate.

3. The photovoltaic diode according to claim 1 or 2, characterized in that: The positive electrode assembly (1) is connected to the position to be installed via a plurality of first fasteners, a plurality of first fastening through holes (13) are arranged at intervals on the positive electrode assembly (1), and each of the first fastening through holes (13) is arranged to penetrate the positive electrode metal plate (11) and the positive electrode ceramic plate (12); and / or The negative electrode assembly (2) is connected to the position to be installed via a plurality of second fasteners, and a plurality of second fastening through holes (23) are arranged at intervals on the negative electrode assembly (2), and each of the second fastening through holes (23) penetrates the negative electrode metal plate (21) and the negative electrode ceramic plate (22).

4. The photovoltaic diode according to claim 1 or 2, characterized in that: The photovoltaic diode comprises: A fool-proof structure (5), wherein the fool-proof structure (5) is arranged on the positive electrode assembly (1) and is located on one side of the width direction of the positive electrode assembly (1); or the fool-proof structure (5) is arranged on the negative electrode assembly (2) and is located on one side of the width direction of the negative electrode assembly (2); and / or A first tin block (7), a first tin storage tank for placing the first tin block (7) is provided on the second side of the positive metal plate (11); and / or A second tin block (8), a second tin storage tank for placing the second tin block (8) is provided on the second side of the negative metal plate (21).

5. The photovoltaic diode according to claim 1 or 2, characterized in that: The positive electrode assembly (1) is provided with a positive electrode welding through hole (14), and the positive electrode welding through hole (14) is provided through the positive electrode metal plate (11) and the positive electrode ceramic plate (12); The negative electrode assembly (2) is provided with a negative electrode welding through hole (24), and the negative electrode welding through hole (24) is provided through the negative electrode metal plate (21) and the negative electrode ceramic plate (22).

6. The photovoltaic diode according to claim 1 or 2, characterized in that: The number of the chips (3) is multiple, and the multiple chips (3) are arranged at intervals along the second predetermined direction; The number of the connecting members (4) is plural, and the connecting members (4) are arranged in a one-to-one correspondence with the chips (3); Wherein, the second predetermined direction is the width direction of the positive electrode assembly (1) and the negative electrode assembly (2).

7. The photovoltaic diode according to claim 1 or 2, characterized in that: The positive metal plate (11) and the negative metal plate (21) are parallel to each other, the second side of the positive metal plate (11) and the second side of the negative metal plate (21) are flush, and the chip (3) is parallel to the positive metal plate (11) and the negative metal plate (21); The connecting member (4) comprises a first connecting plate (41), a second connecting plate (42) and a third connecting plate (43) which are connected in sequence, the first connecting plate (41) and the third connecting plate (43) are parallel to each other, the first connecting plate (41) is connected to the chip (3), and the other end of the third connecting plate (43) is connected to the positive metal plate (11) or the negative metal plate (21).

8. The photovoltaic diode according to claim 1 or 2, characterized in that: The photovoltaic diode further comprises a plastic package (6), at least a portion of which covers the chip (3) and the connector (4).

9. The photovoltaic diode according to claim 8, characterized in that: The plastic sealing part (6) is integrally formed by an injection molding process, and the plastic sealing part (6) comprises: A first plastic sealing portion (61) is arranged on a second side of the positive metal plate (11) and a second side of the negative metal plate (21); A second plastic sealing portion (62), the second plastic sealing portion (62) being arranged on a side of the positive electrode ceramic plate (12) away from the positive electrode metal plate (11) and a side of the negative electrode ceramic plate (22) away from the negative electrode metal plate (21).

10. A junction box, characterized in that: The invention comprises a box body and a photovoltaic diode arranged on the box body, wherein the photovoltaic diode is the photovoltaic diode according to any one of claims 1 to 9.

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