Photovoltaic junction box and photovoltaic module

Abstract

The invention discloses a photovoltaic junction box and a photovoltaic module. The photovoltaic junction box comprises a shell, a bypass part, a first heat dissipation part and a second heat dissipation part. The shell is provided with a containing cavity, the bypass piece is arranged in the containing cavity, and the bypass piece is provided with a pin. And the first heat dissipation piece is in contact with the pin of the bypass piece. The second heat dissipation piece is in contact with the first heat dissipation piece, and the first heat dissipation piece and the second heat dissipation piece are made of different materials. According to the photovoltaic junction box, the first heat dissipation piece and the second heat dissipation piece are installed in the shell, the first heat dissipation piece makes contact with the pins of the bypass piece, and the first heat dissipation piece and the second heat dissipation piece are made of different materials. Therefore, the first heat dissipation piece and the second heat dissipation piece are used in a combined mode, the heat dissipation effect of the photovoltaic junction box is effectively improved, heat is prevented from being accumulated in the containing cavity, therefore, the use safety and stability of the bypass piece are improved, and the service life of the bypass piece and the service life of the photovoltaic junction box are prolonged.

Description

Technical Field

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

[0002] The photovoltaic junction box is a connecting device placed between the solar cell array composed of solar cells and the solar charging control device. Its main function is to connect the solar cell array with the external circuit to conduct the current generated by the solar cell array.

[0003] In the related art, photovoltaic junction boxes usually use copper plates as a medium for heat dissipation. The larger the current of the photovoltaic junction box, the larger the copper plate required. However, in order to prevent the photovoltaic junction box from blocking the sunlight and forming hot spots on the solar cell array, the photovoltaic junction box has gradually become smaller. In the limited space of the photovoltaic junction box, the copper plate cannot meet the current demand, and the traditional copper plate absorbs heat quickly, but the heat conduction efficiency is low, resulting in heat accumulation in the photovoltaic junction box, which can easily damage the electrical components in the photovoltaic junction box and reduce the service life of the photovoltaic junction box. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a photovoltaic junction box, which effectively improves the heat dissipation effect of the photovoltaic junction box and avoids heat accumulation in the accommodating cavity, thereby improving the safety and stability of the bypass component, and further improving the service life of the bypass component.

[0005] Another object of the present invention is to provide a photovoltaic assembly using the photovoltaic junction box.

[0006] A photovoltaic junction box according to an embodiment of the first aspect of the present invention includes a shell having a accommodating cavity; a bypass member, which is arranged in the accommodating cavity and has pins; a first heat sink, which is in contact with the pins of the bypass member; and a second heat sink, which is in contact with the first heat sink, and the first heat sink and the second heat sink are made of different materials.

[0007] According to the photovoltaic junction box of the embodiment of the present invention, the first heat sink and the second heat sink are installed in the shell, the first heat sink is in contact with the pin of the bypass member, and the first heat sink and the second heat sink are made of different materials. Therefore, the first heat sink and the second heat sink are used in combination, which effectively improves the heat dissipation effect of the photovoltaic junction box and avoids heat accumulation in the accommodating cavity, thereby improving the use safety and stability of the bypass member, and further improving the service life of the bypass member and the service life of the photovoltaic junction box.

[0008] According to some embodiments of the present invention, the material of the first heat sink is copper.

[0009] According to some embodiments of the present invention, the material of the second heat sink is aluminum, aluminum nitride, graphite, graphene, copper-aluminum alloy, silicon carbide or thermally conductive silicone.

[0010] According to some embodiments of the present invention, the bypass element includes at least one positive pin and at least one negative pin, and the first heat sink is provided in at least two groups, and the at least two groups of the first heat sinks are respectively connected to the positive pin and the negative pin.

[0011] According to some embodiments of the present invention, a group of second heat sinks are provided, and the second heat sinks are connected to the at least two groups of first heat sinks through a thermally conductive insulating material; or, the second heat sinks are at least two groups, the at least two groups of second heat sinks are arranged at intervals, and the at least two groups of second heat sinks are in direct contact with the corresponding first heat sinks.

[0012] According to some embodiments of the present invention, the pins of the bypass element are arranged on a side surface of the first heat sink in contact with the second heat sink; or, the pins of the bypass element are arranged on a side surface of the first heat sink away from the second heat sink; or, the pins of the bypass element are arranged between the first heat sink and the second heat sink.

[0013] According to some embodiments of the present invention, the first heat dissipation element and / or the second heat dissipation element is provided with a bending portion.

[0014] According to some embodiments of the present invention, a portion of the first heat dissipation element protrudes toward the pin of the bypass element to form a first protrusion, and the pin contacts the first protrusion.

[0015] According to some embodiments of the present invention, a groove is formed on the second heat dissipation member, and the groove cooperates with the first protrusion.

[0016] According to some embodiments of the present invention, the bypass element is a bypass diode or a MOS tube.

[0017] According to some embodiments of the present invention, the pin of the bypass element is connected to the first heat sink by hot melt superposition, ultrasonic welding, resistance welding, solder paste welding, high frequency welding, laser welding, plug welding, argon arc welding or fasteners.

[0018] According to some embodiments of the present invention, the shell includes a box body and a cover body, the box body and the cover body jointly define the accommodating cavity, a card slot is formed on one of the box body and the cover body, and a buckle is provided on the other of the box body and the cover body, and the buckle cooperates with the card slot.

[0019] According to some embodiments of the present invention, a through hole is formed on the box body, and the through hole is at least opposite to the bypass member.

[0020] A photovoltaic assembly according to an embodiment of a second aspect of the present invention comprises a photovoltaic junction box according to an embodiment of the first aspect of the present invention.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a photovoltaic junction box according to an embodiment of the present invention, wherein a cover is not shown;

[0024] Figure 2 is a schematic diagram of a first heat sink, a second heat sink and a bypass element of a photovoltaic junction box according to an embodiment of the present invention;

[0025] Figure 3 yes Figure 2 A schematic diagram of another angle of the first heat sink, the second heat sink and the bypass member shown in ;

[0026] Figure 4 is a schematic diagram of a second heat sink of a photovoltaic junction box according to an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 A schematic diagram of another angle of the second heat dissipation element shown in ;

[0028] Figure 6 is a schematic diagram of a first heat dissipation element of a photovoltaic junction box according to an embodiment of the present invention;

[0029] Figure 7 yes Figure 6 A schematic diagram of another angle of the first heat dissipation element shown in ;

[0030] Figure 8 is a schematic diagram of a first heat sink, a second heat sink and a bypass element of a photovoltaic junction box according to another embodiment of the present invention;

[0031] Fig. 9 yes Figure 8 A schematic diagram of another angle of the first heat sink, the second heat sink and the bypass member shown in ;

[0032] Fig.10 yes Figure 8 A schematic diagram of the first heat sink, the second heat sink and the bypass member at another angle shown in ;

[0033] Fig.11 yes Fig.10 A partial schematic diagram of the first heat sink, the second heat sink and the bypass member shown in ;

[0034] Fig.12 is a schematic diagram of a box body of a photovoltaic junction box according to an embodiment of the present invention;

[0035] Fig.13 is a schematic diagram of a cover of a photovoltaic junction box according to an embodiment of the present invention;

[0036] Fig.14 is a schematic diagram of a photovoltaic junction box according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 100: Photovoltaic junction box;

[0039] 1: shell; 11: accommodating cavity; 12: box body; 121: buckle; 13: cover body; 131: slot; 14: through hole; 141: first reinforcing rib; 142: second reinforcing rib; 15: connecting column; 2: bypass member; 21: pin; 31: first heat sink; 311: first protrusion; 312: second protrusion; 32: second heat sink; 321: heat sink body; 322: bending portion; 3221: first bending section; 3222: second bending section; 3223: third bending section; 323: groove; 33: installation cavity; 34: avoidance; 35: through hole. DETAILED DESCRIPTION

[0040] Reference below Figure 1-Figure 14 A photovoltaic junction box 100 according to an embodiment of a first aspect of the present invention is described.

[0041] like Figure 1-Figure 14 As shown, the photovoltaic junction box 100 according to the first embodiment of the present invention includes a housing 1 , a bypass element 2 , a first heat sink 31 and a second heat sink 32 .

[0042] Specifically, the housing 1 has a housing cavity 11, the bypass member 2 is disposed in the housing cavity 11, and the bypass member 2 has a pin 21. The first heat sink 31 contacts the pin 21 of the bypass member 2, the second heat sink 32 contacts the first heat sink 31, and the first heat sink 31 and the second heat sink 32 are made of different materials.

[0043] For example, in Figure 1-Figure 3 In the example, the housing 1 is substantially rectangular in shape, and the bypass member 2 is disposed in the accommodating cavity 11. Figure 1 In the up and down direction of the accommodating cavity 11), the first heat sink 31 and the second heat sink 32 are sequentially arranged in the accommodating cavity 11. By making the first heat sink 31 and the second heat sink 32 made of different materials, the heat absorption efficiency and heat dissipation of the first heat sink 31 and the second heat sink 32 will be different. Among them, since the first heat sink 31 is in contact with the pin 21 of the bypass element 2 and the second heat sink 32 respectively, the heat absorption efficiency of the first heat sink 31 can be greater than or equal to the heat absorption efficiency of the second heat sink 32, and the heat dissipation efficiency of the second heat sink 32 can be greater than or equal to the heat dissipation efficiency of the first heat sink 31.

[0044] Specifically, the first heat sink 31 contacts the pin 21 of the bypass component 2, so that the heat generated by the bypass component 2 can be transferred to the first heat sink 31, and then the first heat sink 31 and the second heat sink 32 are used to dissipate heat together, thereby reducing the temperature of the bypass component 2 and ensuring the operating stability of the bypass component 2. Therefore, within the limited volume of the photovoltaic junction box 100, the combination of the first heat sink 31 and the second heat sink 32 can meet the heat dissipation requirements of the bypass component 2, thereby improving the applicability of the photovoltaic junction box 100.

[0045] Therefore, the combined use of the first heat sink 31 and the second heat sink 32 can effectively improve the heat absorption and heat dissipation effects of the bypass component 2, and can avoid heat accumulation in the accommodating cavity 11, thereby improving the safety and stability of the bypass component 2, and further improving the service life of the bypass component 2 and the service life of the photovoltaic junction box 100.

[0046] According to the photovoltaic junction box 100 of the embodiment of the present invention, the first heat sink 31 and the second heat sink 32 are installed in the housing 1, the first heat sink 31 contacts the pin 21 of the bypass member 2, and the first heat sink 31 and the second heat sink 32 are made of different materials. Therefore, the first heat sink 31 and the second heat sink 32 are used in combination, which effectively improves the heat dissipation effect of the photovoltaic junction box 100, avoids heat accumulation in the accommodating cavity 11, thereby improving the use safety and stability of the bypass member 2, and further improving the service life of the bypass member 2 and the service life of the photovoltaic junction box 100.

[0047] According to some embodiments of the present invention, the material of the first heat sink 31 is copper. Copper has good thermal conductivity, that is, the first heat sink 31 has high heat absorption efficiency. The use of copper to prepare the first heat sink 31 can effectively improve the heat absorption effect of the first heat sink 31, achieve heat dissipation of the bypass 2, thereby improving the use safety and stability of the bypass 2, and further improving the service life of the bypass 2. At the same time, copper is also conductive, and can achieve signal transmission while dissipating heat.

[0048] According to some embodiments of the present invention, the material of the second heat sink 32 is aluminum, aluminum nitride, graphite, graphene, copper-aluminum alloy, silicon carbide or thermally conductive silicone. Among them, aluminum has a large specific heat capacity; aluminum nitride has the advantages of good thermal conductivity, small thermal expansion coefficient, strong resistance to molten metal corrosion and good dielectric properties; graphite is chemically inactive, corrosion-resistant, and not easy to react with acids and alkalis; graphene has high strength, good toughness, and good thermal conductivity; copper-aluminum alloy has high strength, good heat resistance and processing performance; silicon carbide has the advantages of stable chemical properties, high thermal conductivity and small thermal expansion coefficient; thermally conductive silicone has good resistance to cold and hot alternation, aging resistance and electrical insulation performance.

[0049] That is to say, the second heat sink 32 has good heat dissipation, and the use of aluminum, aluminum nitride, graphite, graphene, copper-aluminum alloy, silicon carbide or thermally conductive silicone to prepare the second heat sink 32 can improve the heat dissipation efficiency of the second heat sink 32 and reduce the production cost of the photovoltaic junction box 100. Therefore, the combination of the first heat sink 31 and the second heat sink 32 can effectively improve the heat absorption and heat dissipation effects of the bypass member 2, achieve rapid heat dissipation of the bypass member 2, and avoid heat accumulation in the accommodating cavity 11, thereby further improving the use safety and stability of the bypass member 2.

[0050] According to some specific embodiments of the present invention, the bypass component 2 includes at least one positive electrode pin and at least one negative electrode pin, and the first heat sink 31 is provided with at least two groups, and the at least two groups of first heat sinks 31 are respectively connected to the positive electrode pin and the negative electrode pin. In this way, the positive electrode pin and the negative electrode pin are respectively connected to the first heat sink 31, which improves the heat transfer efficiency between the bypass component 2 and the first heat sink 31, realizes the rapid heat dissipation of the first heat sink 31, and effectively avoids the formation of a closed loop between the bypass component 2 and the first heat sink 31, that is, avoids the positive electrode pin of the bypass component 2 from being electrically connected to the negative electrode pin, thereby avoiding the bypass component 2 from being damaged due to a short circuit.

[0051] Furthermore, a group of second heat sinks 32 are provided, and the second heat sinks 32 are connected to at least two groups of first heat sinks 31 through heat-conducting insulating materials. In this way, while ensuring heat dissipation of the bypass element 2, the insulation between the second heat sink 32 and the first heat sink 31 is increased, and the positive pin and the negative pin of the bypass element 2 are prevented from being electrically connected, thereby improving the safety of the photovoltaic junction box 100.

[0052] Alternatively, there are at least two groups of second heat sinks 32, at least two groups of second heat sinks 32 are arranged at intervals, and at least two groups of second heat sinks 32 are in direct contact with the corresponding first heat sinks 31. In this way, each group of first heat sinks 31 is in direct contact with the corresponding second heat sink 32, and the heat transfer efficiency and heat dissipation efficiency of each pin 21 of the bypass member 2 are improved through the combination of the first heat sink 31 and the second heat sink 32.

[0053] According to some embodiments of the present invention, the pin 21 of the bypass member 2 is arranged on a side surface (not shown) where the first heat sink 31 contacts the second heat sink 32. For example, the first heat sink 31 and the second heat sink 32 are partially in contact, and the pin 21 can be arranged at a position where the first heat sink 31 and the second heat sink 32 are not in contact. In this way, the heat generated by the bypass member 2 can be transferred to the first heat sink 31 with higher heat absorption efficiency, and the first heat sink 31 transfers the heat to the second heat sink 32 with better heat dissipation, thereby improving the heat dissipation efficiency of the bypass member 2.

[0054] Or, refer to Figure 8-Figure 11 , the pin 21 of the bypass member 2 is arranged on the surface of one side of the first heat sink 31 away from the second heat sink 32. That is to say, the pin 21 of the bypass member 2 is arranged on one side of the thickness direction of the first heat sink 31. Along the thickness direction of the first heat sink, one side of the first heat sink 31 is connected to the pin 21 of the bypass member 2, and the other side of the first heat sink 31 is connected to the second heat sink 32. With such an arrangement, the heat generated by the bypass member 2 can be transferred to the first heat sink 31 with higher heat absorption efficiency, and the first heat sink 31 transfers the heat to the second heat sink 32 with better heat dissipation, thereby improving the heat dissipation efficiency of the bypass member 2.

[0055] Or, refer to Figure 2-Figure 3 , the pin 21 of the bypass member 2 is arranged between the first heat sink 31 and the second heat sink 32. That is, the first heat sink 31 and the second heat sink 32 jointly define a mounting cavity 33, and the pin 21 of the bypass member 2 is located in the mounting cavity 33. Further, the pin 21 of the bypass member 2 can also be arranged on the side of the first heat sink 31 as needed.

[0056] For example, in Figure 3 In the example, the pin 21 of the bypass member 2 is inserted into the installation cavity 33, and the first heat sink 31 and the second heat sink 32 jointly limit the movement of the bypass member 2 in the thickness direction of the first heat sink 31, thereby increasing the installation stability of the bypass member 2 in the installation cavity 33. At the same time, the distance between the pin 21 of the bypass member 2 and the first heat sink 31 and the second heat sink 32 is reduced, so that the pin 21 of the bypass member 2 can be connected to the first heat sink 31 and the second heat sink 32, so that the heat generated on the bypass member 2 can be quickly transferred to the first heat sink 31 or the second heat sink 32 to dissipate the heat of the bypass member 2, thereby improving the heat dissipation efficiency of the bypass member 2.

[0057] According to some embodiments of the present invention, the first heat sink 31 and / or the second heat sink 32 are provided with a bending portion 322, so that the heat dissipation area of ​​the first heat sink 31 and / or the second heat sink 32 can be increased. When the heat dissipation demand is large, the first heat sink 31 is provided with a bending portion 322, and the second heat sink 32 is also provided with a bending portion 322 (not shown); or, the first heat sink 31 is provided with a bending portion 322, and the second heat sink 32 is not provided with a bending portion 322 (not shown); or, the first heat sink 31 is not provided with a bending portion 322, and the second heat sink 32 is provided with a bending portion 322 (such as Figure 3-Figure 5 shown).

[0058] For example, the second heat sink 32 may include a heat sink body 321 and at least one bending portion 322 connected to each other, the heat sink body 321 is connected to the first heat sink 31, there is one bending portion 322, and the bending portion 322 protrudes away from the first heat sink 31, which is beneficial to increase the heat dissipation area of ​​the second heat sink 32.

[0059] Furthermore, the pin 21 of the bypass element 2 may also be disposed on the bent portion 322 of the first heat sink 31 as required.

[0060] Further, refer to Figure 3-Figure 5 The bending portion 322 includes a first bending section 3221, a second bending section 3222, and a third bending section 3223. The first bending section 3221 is connected to the heat dissipation body 321, and the first bending section 3221 extends away from the heat dissipation body 321 in the thickness direction of the second heat dissipation element 32. One end of the second bending section 3222 is connected to the first bending section 3221, and the second bending section 3222 extends in the length direction of the second heat dissipation element 32 (for example, Figure 1 The third bending section 3223 is connected to the other end of the second bending section 3222, and the third bending section 3223 extends in the thickness direction of the second heat sink 32 toward the first heat sink 31. Thus, the first bending section 3221, the second bending section 3222 and the third bending section 3223 are sequentially connected to form a bending portion 322, which is used to cooperate with the first heat sink 31 to form a mounting cavity 33 suitable for placing the pin 21 of the bypass member 2. At the same time, the structures of the first bending section 3221, the second bending section 3222 and the third bending section 3223 are relatively simple, which is conducive to reducing the processing difficulty of the bending portion 322, thereby improving the production efficiency of the second heat sink 32.

[0061] Furthermore, refer to Figure 3-Figure 5, in the thickness direction of the second heat sink 32, the length of the third bending section 3223 is greater than or equal to the length of the first bending section 3221. When the length of the third bending section 3223 is equal to the length of the first bending section 3221, the flatness of the surface of the second heat sink 32 facing the first heat sink 31 is increased, so that it is convenient to combine the second heat sink 32 with the first heat sink 31; when the length of the third bending section 3223 is greater than the length of the first bending section 3221, the heat dissipation area of ​​the second heat sink 32 is increased, thereby improving the heat dissipation efficiency of the second heat sink 32.

[0062] According to some embodiments of the present invention, in the width direction (eg, Figure 1 In the left-right direction of the figure, the heat dissipation body 321 protrudes from the bent portion 322, and the heat dissipation body 321 and the bent portion 322 together define the escape opening 34. Figure 4 and Figure 5 In the example, in the width direction of the second heat sink 32, one end of the heat sink body 321 protrudes from the bent portion 322 to define a clearance opening 34. The clearance opening 34 faces the bypass member 2, so that the second heat sink 32 avoids the bypass member 2, thereby preventing the second heat sink 32 from interfering with the bypass member 2.

[0063] According to some embodiments of the present invention, part of the first heat sink 31 protrudes toward the pin 21 of the bypass element 2 to form a first protrusion 311, and the pin 21 contacts the first protrusion 311. Figure 3 , Figure 6 and Figure 7 In the example, two first protrusions 311 are formed on the first heat sink 31, and both first protrusions 311 can contact the pins 21 of the bypass member 2. Thus, while ensuring that the weight of the first heat sink 31 remains unchanged, the height of the first heat sink 31 in the thickness direction of the first heat sink 31 is increased, which facilitates resistance welding of the pins 21 of the bypass member 2 with the first protrusions 311, thereby achieving connection between the pins 21 of the bypass member 2 and the first heat sink 31.

[0064] Furthermore, a groove 323 is formed on the second heat sink 32, and the groove 323 cooperates with the first protrusion 311. Such a configuration is conducive to avoiding the first protrusion 311 and avoiding damage to the first protrusion 311. At the same time, the connection area between the first heat sink 31 and the second heat sink 32 is increased, thereby increasing the connection stability between the first heat sink 31 and the second heat sink 32, and increasing the heat transfer efficiency between the first heat sink 31 and the second heat sink 32, thereby increasing the heat dissipation efficiency of the bypass member 2.

[0065] In some optional embodiments, the bypass component 2 is a bypass diode or a MOS tube. Among them, the bypass diode can prevent a portion of the solar cell from being blocked and not receiving light, causing a serious load, thereby preventing the solar cell from heating and being damaged. The MOS tube is a metal (metal)-oxide (oxide)-semiconductor (semiconductor) field effect transistor, and is also a metal-insulator (insulator)-semiconductor. The MOS tube has the advantages of simple voltage control, small size, light weight, long service life, high input resistance, low noise, good thermal stability, strong anti-interference ability and low power consumption. Therefore, using a bypass diode or a MOS tube as the bypass component 2 can effectively increase the service life of the photovoltaic junction box 100.

[0066] In some optional embodiments, the pin 21 of the bypass component 2 is connected to the first heat sink 31 by hot melt superposition, ultrasonic welding, resistance welding, solder paste welding, high frequency welding, laser welding, plug welding, argon arc welding or fasteners. Among them, hot melt superposition heats up the components such as plastic columns, and then uses the hot-melted components to connect the pin 21 of the bypass component 2 and the first heat sink 31. Ultrasonic welding uses overclocked vibration friction to make the pin 21 of the bypass component 2 and the first heat sink 31 fuse at the molecular level. Resistance welding combines the pin 21 of the bypass component 2 and the first heat sink 31, applies pressure through electrodes, and uses the resistance heat generated by the current passing through the contact surface between the pin 21 of the bypass component 2 and the first heat sink 31 and the adjacent area to perform welding. The solder paste used in solder paste welding has a certain viscosity at room temperature, and can initially stick the pin 21 of the bypass component 2 and the first heat sink 31 to a predetermined position. At the welding temperature, as the solvent and part of the additives evaporate, the pin 21 of the bypass component 2 and the first heat sink 31 are welded together to form a permanent connection.

[0067] High-frequency welding uses the high-frequency current flowing through the contact surface between the pin 21 of the bypass 2 and the first heat sink 31 to generate resistance heat, and applies pressure (or no pressure) to connect the pin 21 of the bypass 2 and the first heat sink 31 together. Laser welding uses a high-energy-density laser beam as a heat source to weld the pin 21 of the bypass 2 and the first heat sink 31; plug welding connects the pin 21 of the bypass 2 and the first heat sink 31, and welds the pin 21 of the bypass 2 and the first heat sink 31 through melting welding. Argon arc is based on the principle of ordinary arc welding, using argon gas to protect the welding material, and high current is used to melt the welding material on the pin 21 of the bypass 2 and the first heat sink 31 into a liquid to form a molten pool, so that the pin 21 of the bypass 2 and the first heat sink 31 and the welding material are metallurgically bonded. Since argon gas is continuously supplied during high-temperature molten welding, the welding material cannot contact with oxygen in the air, thereby preventing oxidation of the welding material. Alternatively, the pin 21 of the bypass element 2 and the first heat sink 31 may be connected by mechanical fixing using a fastener, wherein the fastener may be a bolt or a clip.

[0068] Optionally, a plurality of through holes 35 are formed on the first heat sink 31 and the second heat sink 32, and a connecting column 15 is provided on the inner wall of the housing 1. During installation, the connecting column 15 passes through the through holes 35 on the first heat sink 31 and the second heat sink 32, and then is connected by a fixing member, thereby increasing the installation stability of the heat sink 3 in the housing 1, and also increasing the connection stability between the first heat sink 31 and the second heat sink 32.

[0069] According to some specific embodiments of the present invention, the housing 1 includes a box body 12 and a cover body 13, the box body 12 and the cover body 13 jointly define a receiving chamber 11, a card slot 131 is formed on one of the box body 12 and the cover body 13, and a buckle 121 is provided on the other of the box body 12 and the cover body 13, and the buckle 121 cooperates with the card slot 131. When the card slot 131 is formed on the box body 12, the cover body 13 is provided with a buckle 121 (not shown); when the box body 12 is provided with a buckle 121, the cover body 13 is provided with a card slot 131 (not shown); Figure 12-14 As shown). Thus, a detachable connection between the cover body 13 and the box body 12 is achieved.

[0070] For example, in Figure 12-14In the example, two buckles 121 are provided on the box body 12, and the two buckles 121 are respectively provided at the two ends of the length direction of the box body 12, and the cover body 13 is formed with a slot 131 at the position corresponding to the buckle 121. When in use, the cover body 13 is covered on the opening position of the box body 12, and the buckle 121 is buckled in the slot 131, so that the cover body 13 is stably covered on the box body 12. When it is necessary to inspect the shell 1, the buckle 121 can be separated from the slot 131, that is, the connection between the cover body 13 and the box body 12 is disconnected, so as to facilitate the inspection and maintenance of the bypass member 2, the first heat sink 31 and the second heat sink 32 in the shell 1.

[0071] Further, refer to Fig.12 A through hole 14 is formed on the box body 12, and the through hole 14 is at least opposite to the bypass member 2. A through hole 14 is formed through the center of the bottom wall of the box body 12, and the through hole 14 connects the accommodating cavity 11 and the outside, so as to facilitate the injection of glue into the accommodating cavity 11 to fix the bypass member 2, the first heat sink 31 and the second heat sink 32 in the accommodating cavity 11. The through hole 14 corresponds to the opening of the box body 12, thereby reducing the number of bubbles in the glue and increasing the reliability of the glue fixing the bypass member 2, the first heat sink 31 and the second heat sink 32.

[0072] Furthermore, refer to Fig.12 At least one first reinforcing rib 141 is disposed in the through hole 14 . The first reinforcing rib 141 extends along the length direction of the first heat dissipation member 31 and the second heat dissipation member 32 , and the first reinforcing rib 141 protrudes toward the accommodating cavity 11 .

[0073] Reference Fig.12 Two first reinforcing ribs 141 are provided in the through hole 14, and the two first reinforcing ribs 141 are respectively provided on both sides of the through hole 14 along the length direction of the housing 1. The surface of the first reinforcing rib 141 facing the accommodating cavity 11 can be used to support the first heat sink 31 and the second heat sink 32, and the first reinforcing rib 141 can separate the first heat sink 31 and the second heat sink 32 from the bottom wall of the box body 12, so as to facilitate the heat dissipation of the first heat sink 31 and the second heat sink 32, and / or facilitate the filling of glue between the first heat sink 31 and the second heat sink 32 and the bottom wall of the box body 12, so as to further increase the reliability of the glue fixing to the first heat sink 31 and the second heat sink 32.

[0074] In addition, at least one second reinforcing rib 142 is disposed in the through hole 14. The second reinforcing rib 142 extends along the width direction of the first heat sink 31 and the second heat sink 32. Both ends of the second reinforcing rib 142 are connected to the first reinforcing rib 141 and the inner wall of the through hole 14, respectively. Fig.12Two second reinforcing ribs 142 are provided in the through hole 14, one end of the second reinforcing rib 142 is connected to the middle of the first reinforcing rib 141, and the other end of the second reinforcing rib 142 is connected to the inner wall of the box body 12 facing the through hole 14, so that the second reinforcing rib 142 increases the stability of the first reinforcing rib 141, thereby increasing the structural stability of the photovoltaic junction box 100.

[0075] In some optional embodiments, the pin 21 of the bypass element 2 includes a flat / sheet structure, thereby facilitating the selection of a suitable bypass element 2 for solder resistance connection with the first heat sink 31 , thereby increasing the connection stability between the bypass element 2 and the first heat sink 31 .

[0076] According to some other embodiments of the present invention, a portion of the first heat sink 31 protrudes toward the pin 21 of the bypass element 2 to form a second protrusion 312. The second protrusion 312 is used to connect with a cable.

[0077] A photovoltaic assembly (not shown) according to an embodiment of a second aspect of the present invention comprises a photovoltaic junction box 100 according to an embodiment of the first aspect of the present invention.

[0078] The photovoltaic assembly according to the embodiment of the present invention adopts the photovoltaic junction box 100 to increase the operational stability and reliability of the photovoltaic assembly, while increasing the service life of the photovoltaic assembly, thereby increasing the market competitiveness of the photovoltaic assembly.

[0079] Other structures and operations of the photovoltaic junction box 100 and the photovoltaic assembly according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0080] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0081] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0083] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic junction box, characterized in that: include: A housing having a receiving cavity; A bypass piece, the bypass piece is disposed in the accommodating cavity, and the bypass piece has a pin; a first heat sink, the first heat sink being in contact with the pin of the bypass element; The second heat dissipation member is in contact with the first heat dissipation member, and the first heat dissipation member and the second heat dissipation member are made of different materials.

2. The photovoltaic junction box according to claim 1, characterized in that: The first heat sink is made of copper.

3. The photovoltaic junction box according to claim 1 or 2, characterized in that: The material of the second heat sink is aluminum, aluminum nitride, graphite, graphene, copper-aluminum alloy, silicon carbide or thermally conductive silicone.

4. The photovoltaic junction box according to claim 1, characterized in that: The bypass element includes at least one positive electrode pin and at least one negative electrode pin, The first heat sinks are provided in at least two groups, and the at least two groups of the first heat sinks are respectively connected to the positive electrode pin and the negative electrode pin.

5. The photovoltaic junction box according to claim 4, characterized in that: The second heat sink is provided in a group, and the second heat sink is connected to the at least two groups of the first heat sinks through a heat-conducting insulating material; or, The second heat dissipation members are divided into at least two groups, the at least two groups of the second heat dissipation members are arranged at intervals, and the at least two groups of the second heat dissipation members are in direct contact with the corresponding first heat dissipation members.

6. The photovoltaic junction box according to claim 1, characterized in that: The pin of the bypass element is arranged on a side surface of the first heat sink that contacts the second heat sink; or, The pin of the bypass element is arranged on a side surface of the first heat sink away from the second heat sink; or, The pin of the bypass element is disposed between the first heat sink and the second heat sink.

7. The photovoltaic junction box according to claim 1, characterized in that: The first heat sink and / or the second heat sink is provided with a bending portion.

8. The photovoltaic junction box according to claim 1, characterized in that: A portion of the first heat dissipation member protrudes toward the pin of the bypass member to form a first protrusion, and the pin contacts the first protrusion.

9. The photovoltaic junction box according to claim 8, characterized in that: A groove is formed on the second heat dissipation member, and the groove matches with the first protrusion.

10. The photovoltaic junction box according to claim 1, characterized in that: The bypass element is a bypass diode or a MOS tube.

11. The photovoltaic junction box according to claim 1, characterized in that: The pin of the bypass component is connected to the first heat sink by hot melt superposition, ultrasonic welding, resistance welding, solder paste welding, high frequency welding, laser welding, plug welding, argon arc welding or fasteners.

12. The photovoltaic junction box according to claim 1, characterized in that: The shell includes a box body and a cover body, the box body and the cover body jointly define the accommodating cavity, a card slot is formed on one of the box body and the cover body, and a buckle is provided on the other of the box body and the cover body, and the buckle cooperates with the card slot.

13. The photovoltaic junction box according to claim 12, characterized in that: A through hole is formed on the box body, and the through hole is at least opposite to the bypass member.

14. A photovoltaic module, characterized in that: Comprising the photovoltaic junction box according to any one of claims 1-13.

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