Photovoltaic optimizer and photovoltaic system

Abstract

The utility model provides a photovoltaic optimizer and a photovoltaic system, the photovoltaic optimizer comprises a shell, a heating assembly and heat conduction insulation powder, the shell is made of a metal material, and the shell is provided with an accommodating cavity; the heating assembly is located in the containing cavity. The heat-conducting insulating powder is located in the containing cavity, fills a gap between the cavity wall of the containing cavity and the heating assembly, and is used for insulating the heating assembly from the shell and transmitting heat generated by the heating assembly to the shell. According to the technical scheme, the problem of low heat dissipation efficiency of the photovoltaic optimizer can be solved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic optimizer and a photovoltaic system. Background Art

[0002] In photovoltaic power generation systems, photovoltaic modules are susceptible to various factors such as light intensity, temperature, shadows and dirt, which can lead to reduced performance and power generation efficiency. In order to solve the problem of reduced power generation efficiency of photovoltaic modules, photovoltaic optimizers came into being. Photovoltaic optimizers can monitor and control parameters such as voltage, current and temperature of photovoltaic modules in real time, so that the output power of photovoltaic modules is maintained at the maximum power point, thereby improving the power generation efficiency of photovoltaic modules. As the power density of photovoltaic optimizers continues to increase, the heat consumption density of photovoltaic optimizers is also getting higher and higher. Heat dissipation has become an important challenge in the design of photovoltaic optimizers. Whether photovoltaic optimizers can perform good heat dissipation directly affects the working reliability and comprehensive performance of photovoltaic optimizers. However, the heat dissipation performance of existing photovoltaic optimizers is low, which easily leads to low working reliability of photovoltaic optimizers. Utility Model Content

[0003] The present application provides a photovoltaic optimizer and a photovoltaic system, which can solve the technical problem of low heat dissipation efficiency of the photovoltaic optimizer.

[0004] In a first aspect, the present application provides a photovoltaic optimizer, comprising:

[0005] A shell, wherein the shell is made of a metal material and has a receiving cavity;

[0006] A heat generating component, the heat generating component is located in the accommodating cavity; and

[0007] Thermally conductive insulating powder, the thermally conductive insulating powder is located in the accommodating cavity, the thermally conductive insulating powder fills the gap between the cavity wall of the accommodating cavity and the heating component, the thermally conductive insulating powder is used to insulate the heating component from the outer shell, and is used to transfer the heat generated by the heating component to the outer shell.

[0008] It is understandable that when the photovoltaic optimizer is working, the heat generating components inside the photovoltaic optimizer will continue to generate heat. If the heat of the heat generating components is not dissipated in time, it will affect the reliability of the photovoltaic optimizer and thus affect the efficiency of the entire photovoltaic system. In particular, as the power density of the photovoltaic optimizer continues to increase, the heat dissipation performance of the photovoltaic optimizer is becoming an increasingly important factor affecting the efficiency of the photovoltaic system.

[0009] In the related art, the interior of the photovoltaic optimizer is filled with thermally conductive glue to transfer the heat generated by the heating device to the outer shell through the thermally conductive glue and achieve heat dissipation. The thermal conductivity of the thermally conductive glue is generally low, for example, between 0.3 watts / (meter*degree) (W / (m*K), where K can be replaced by ℃)-1W / (m*K). When a thermally conductive glue with a low thermal conductivity is used, although the encapsulation inside the outer shell can be achieved, the low thermal conductivity of the thermally conductive glue can easily lead to poor heat dissipation effect and low heat dissipation efficiency of the photovoltaic optimizer, and it is easy to form local hot spots on the outer shell of the photovoltaic optimizer. When a thermally conductive glue with a high thermal conductivity is used, the flowability of the thermally conductive glue will deteriorate due to the increase in the thermal conductivity of the thermally conductive glue. The deterioration of the flowability of the thermally conductive glue will make it difficult to achieve encapsulation, reduce the heat dissipation area of ​​the photovoltaic optimizer, and also easily form local hot spots on the outer shell of the photovoltaic optimizer.

[0010] Therefore, in the embodiment of the present application, by making the shell made of metal material, the heat dissipation performance of the photovoltaic optimizer as a whole can be effectively increased due to the excellent heat dissipation capacity of the metal material. In addition, since the shell is made of metal material, the metal material also has good electrical conductivity, so the heat-conducting insulating powder is filled in the accommodating cavity of the shell, so that the heat-conducting insulating powder can separate the heating component from the shell made of metal material, respectively, and insulate the heating component from the shell made of metal material, so as to meet the safety specification requirements of the photovoltaic optimizer. Moreover, the heat-conducting insulating powder is a powdered solid, and compared with the thermally conductive glue, there is no problem of poor fluidity, and it is easier to achieve full filling, ensuring the contact area between the heating component and the heat-conducting insulating powder. The heat-conducting insulating powder can also transfer the heat generated by the heating component to the metal shell, and then to the air around the shell, which speeds up the heat dissipation speed of the photovoltaic optimizer and improves the heat dissipation stability of the photovoltaic optimizer.

[0011] In addition, in the embodiment of the present application, the thermally conductive insulating powder is made of a material with a relatively large thermal conductivity, such as alumina, aluminum nitride or silicon nitride. Compared with thermally conductive adhesives with relatively low thermal conductivity [0.5W / (m*K) to 2.5W / (m*K)], the thermally conductive insulating powder provided in this embodiment has a high thermal conductivity, for example, the thermal conductivity of alumina is about 10W / (m*K), and has a higher efficiency in transferring heat, which is more conducive to improving the rapid heat dissipation capability of the photovoltaic optimizer.

[0012] In a possible implementation, the photovoltaic optimizer further includes an insulating layer, wherein the insulating layer covers at least a portion of a cavity wall of the accommodating cavity, and the insulating layer is in contact with the thermally conductive insulating powder.

[0013] It can be understood that by providing an insulating layer on the cavity wall of the accommodating cavity, the insulating layer can be combined with the thermally conductive insulating powder to further enhance the insulation effect between the outer shell of the photovoltaic optimizer and the heating component, making it less likely for the photovoltaic optimizer to fail due to electrical conduction between the outer shell of the photovoltaic optimizer and the heating component, thereby effectively improving the working reliability of the photovoltaic optimizer.

[0014] In a possible implementation manner, the accommodating cavity includes a top wall and a bottom wall, the bottom wall, the heating component and the top wall are sequentially arranged in a thickness direction of the accommodating cavity, and the insulating layer includes a first layer and a second layer;

[0015] The first layer is disposed on the top wall and in contact with the thermally conductive insulating powder, and the second layer is disposed on the bottom wall and in contact with the thermally conductive insulating powder.

[0016] It can be understood that the first layer can separate the heating component from the top wall of the accommodating cavity, and the second layer can separate the heating component from the bottom wall of the accommodating cavity, so that the heating component is further insulated from the shell, fully ensuring the safety specification requirements of the photovoltaic optimizer. In addition, by providing the first layer and the second layer, the size of the filled thermally conductive insulating powder along the thickness direction of the photovoltaic optimizer can be reduced, the volume of the filled thermally conductive insulating powder can be reduced, and then the amount of thermally conductive insulating powder can be reduced, thereby reducing the manufacturing cost of the photovoltaic optimizer.

[0017] In a possible implementation, the photovoltaic optimizer further includes a plurality of heat dissipation teeth, the plurality of heat dissipation teeth are connected to the outer surface of the housing, the plurality of heat dissipation teeth are arranged at intervals, and a gap area between two adjacent heat dissipation teeth forms a heat dissipation air duct.

[0018] It can be understood that by forming a heat dissipation duct in the gap area between two adjacent heat dissipation teeth, the heat dissipation area of ​​the outer shell in contact with the air can be increased, so that the heated hot air in the heat dissipation duct flows to the outside of the heat dissipation duct, and the cold air outside the heat dissipation duct enters the heat dissipation duct, thereby quickly transferring the heat on the outer shell to the external environment of the photovoltaic optimizer through the circulation of hot and cold air, thereby improving the convective heat exchange level of the natural heat dissipation of the photovoltaic optimizer, making the photovoltaic optimizer have excellent heat dissipation performance as a whole, and effectively improving the heat dissipation efficiency of the photovoltaic optimizer.

[0019] In a possible implementation manner, the outer surface of the housing includes a first surface and a second surface, the second surface and the first surface are arranged opposite to each other in the thickness direction of the photovoltaic optimizer, the first surface can face away from the photovoltaic component, and the second surface can face the photovoltaic component;

[0020] The multiple heat dissipation teeth include multiple first teeth and multiple second teeth, the multiple first teeth are protruded on the first surface, the multiple first teeth are arranged at intervals, and the gap area between two adjacent first teeth forms a first air duct, and the multiple second teeth are protruded on the second surface, the multiple second teeth are arranged at intervals, and the gap area between two adjacent second teeth forms a second air duct.

[0021] It can be understood that the first surface of the shell is the surface of the shell facing away from the photovoltaic component. Arranging multiple first teeth on the first surface of the shell can provide the heat dissipation teeth with a larger structural setting space without affecting the assembly reliability of the photovoltaic optimizer and the photovoltaic component. The teeth can be more fully in contact with the air in the external environment of the photovoltaic optimizer, which is beneficial to improving the heat dissipation performance of the photovoltaic optimizer.

[0022] Arranging a plurality of second teeth on the second surface of the outer shell enables the plurality of second teeth to be located in the gap area between the outer shell of the photovoltaic optimizer and the photovoltaic module, thereby making full use of the idle space between the outer shell of the photovoltaic optimizer and the photovoltaic module, and further increasing the heat dissipation surface area of ​​the outer shell in contact with the air, thereby improving the heat dissipation efficiency of the photovoltaic optimizer.

[0023] In a possible implementation manner, the shell has an injection hole, the injection hole is communicated with the accommodating cavity, and the injection hole is used to inject the thermally conductive insulating powder into the accommodating cavity.

[0024] It can be understood that by setting an injection hole on the outer shell and connecting the injection hole with the receiving cavity inside the outer shell, the thermally conductive insulating powder can be introduced into the inner part of the outer shell from the outside of the outer shell, so that the thermally conductive insulating powder can fill the receiving cavity of the outer shell more conveniently and quickly, effectively preventing the thermally conductive insulating powder from splashing, and having better reliability.

[0025] In a possible implementation manner, the heat generating component includes a circuit board and an electronic device, the circuit board includes a first connection surface and a second connection surface, the first connection surface and the second connection surface are arranged opposite to each other along a thickness direction of the circuit board, and the electronic device is connected to the first connection surface and / or the second connection surface;

[0026] The photovoltaic optimizer also includes a vapor chamber, which is fixedly connected to the first connection surface, and the electronic device connected to the first connection surface is located between the vapor chamber and the circuit board.

[0027] It is understandable that the electronic devices arranged on both sides of the circuit board can add a layer of device layout compared to the devices arranged on only one side of the circuit board, thereby significantly improving the device arrangement density of the photovoltaic optimizer. In addition, by fixing the heat spreader to the circuit board, the heat spreader can quickly absorb the heat from the electronic devices and transfer it to the outside, thereby improving the heat dissipation efficiency of the photovoltaic optimizer.

[0028] In a possible embodiment, the heating component also includes a first metal column, which is fixedly connected to the first connecting surface and / or the second connecting surface, and the first metal column is spaced apart from the electronic device, and the first metal column connected to the first connecting surface is in contact with or spaced apart from the heat spreader.

[0029] It is understandable that by setting the first metal column on the circuit board, the heat dissipation area of ​​the heating component can be increased, so that the heat generated by the heating component can be dissipated outward through the first metal column, which is beneficial to improving the heat dissipation efficiency of the heating component.

[0030] In a possible implementation, the heat generating component further includes a second metal column, the circuit board further includes a side surface, the side surface is connected between the first connection surface and the second connection surface, and the second metal column is connected to the side surface.

[0031] It can be understood that the side of the circuit board is the surface on which no electronic devices are arranged in the circuit board. By arranging the second metal column on the side of the circuit board, the layout space of the circuit board can be fully utilized. On the basis of further increasing the heat dissipation area of ​​the heat-generating component, more board space on the circuit board can be freed up to layout more electronic devices, which is beneficial to improving the device arrangement density of the photovoltaic optimizer.

[0032] In a possible implementation manner, the housing includes a first shell and a second shell, the second shell and the first shell are arranged opposite to each other in the thickness direction of the photovoltaic optimizer, and the first shell and the second shell cooperate to form the accommodating cavity;

[0033] The photovoltaic optimizer further includes a seal, which is sandwiched between the first shell and the second shell and seals the first shell and the second shell.

[0034] It is understandable that when the housing is a split structure, the structures of the various parts of the housing are relatively simple, the processing process is relatively easy, and the production yield is relatively high. By providing a seal between the first housing and the second housing, the first housing and the second housing can have good sealing performance, and the accommodating cavity formed by splicing the first housing and the second housing can have good airtight performance and better reliability.

[0035] In a second aspect, the present application further provides a photovoltaic system, comprising a photovoltaic component, a power converter and the photovoltaic optimizer as described above, wherein the photovoltaic optimizer is connected between the photovoltaic component and the power converter.

[0036] In a possible implementation, the photovoltaic optimizer further includes a mounting plate, wherein the mounting plate is connected to the outer shell, the mounting plate is protruding relative to an outer peripheral surface of the outer shell, and the outer shell is detachably connected to the photovoltaic assembly via the mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0038] Figure 1 A schematic diagram of an application scenario of a photovoltaic system provided in an embodiment of the present application;

[0039] Figure 2 For multiple Figure 1 The schematic diagram of the structure of photovoltaic strings formed by connecting photovoltaic modules in series is shown;

[0040] Figure 3 is a schematic diagram of the assembly of a photovoltaic module and a photovoltaic optimizer provided in an embodiment of the present application;

[0041] Figure 4 for Figure 3 A structural schematic diagram of a photovoltaic optimizer shown;

[0042] Figure 5 for Figure 4 The exploded structural diagram of the photovoltaic optimizer shown;

[0043] Figure 6 for Figure 4 The cross-sectional structure diagram of the photovoltaic optimizer along the AA plane is shown;

[0044] Figure 7 for Figure 3 Another structural schematic diagram of a photovoltaic optimizer shown;

[0045] Figure 8 for Figure 3 Another structural schematic diagram of a photovoltaic optimizer is shown;

[0046] Fig. 9 for Figure 3 The cross-sectional structure diagram of the photovoltaic module and the photovoltaic optimizer along the BB plane is shown;

[0047] Fig.10 for Figure 7 The cross-sectional structure diagram of the photovoltaic optimizer along the CC plane is shown. DETAILED DESCRIPTION

[0048] For ease of understanding, the terms involved in the embodiments of the present application are first explained.

[0049] And / or: It is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0050] Multiple: refers to two or more than two.

[0051] Connection: should be understood in a broad sense. For example, A and B are connected, which can be either direct or indirect through an intermediary.

[0052] The specific implementation of the present application will be clearly described below in conjunction with the accompanying drawings.

[0053] The embodiments of the present application provide a photovoltaic inverter and a photovoltaic system. Among them, the photovoltaic system can use the photovoltaic effect of semiconductor materials to convert solar energy into electrical energy and generate electricity. When using solar energy for photovoltaic power generation, light energy can be directly converted into electrical energy without going through a thermal process. This power generation method has the characteristics of no moving parts, no noise, no pollution, and high reliability, and has good application prospects in the field of new energy power generation. The photovoltaic system is suitable for powering base station equipment in remote areas where there is no city power or poor city power, or for powering batteries, or for powering various types of electrical equipment such as household appliances (such as refrigerators, air conditioners, etc.) in the AC power grid. The specific power supply can be determined according to the actual application scenario and is not limited here.

[0054] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of an application scenario of a photovoltaic system 1000 provided in an embodiment of the present application. Figure 2 For multiple Figure 1 The photovoltaic components 200 shown are connected in series to form a photovoltaic string 400. The photovoltaic system 1000 may include the photovoltaic components 200, the photovoltaic optimizer 100 and the power converter 300.

[0055] The photovoltaic module 200 is used to convert solar energy into direct current electricity. The photovoltaic module 200 may also be referred to as a solar cell module or a photovoltaic panel. There may be multiple photovoltaic modules 200, and multiple photovoltaic modules 200 may be connected in series and / or in parallel to form a photovoltaic string 400. The photovoltaic system 1000 may have multiple photovoltaic strings 400, and the multiple photovoltaic strings 400 may be arranged in an array. For example, Figure 2As shown, a plurality of photovoltaic modules 200 may be connected in series to form a photovoltaic string 400 , and the voltage across the photovoltaic string 400 is equal to the sum of the voltages of the plurality of photovoltaic modules 200 constituting the photovoltaic string 400 .

[0056] The photovoltaic optimizer 100 is electrically connected to the photovoltaic module 200. The photovoltaic optimizer 100 has a maximum power point tracking (MPPT) function, which can detect the output voltage and output current of the photovoltaic module 200 in real time, and track the output current and output voltage corresponding to the working point with the highest output power, so as to adjust the output power of the photovoltaic module 200 in real time, so that the photovoltaic module 200 is always in the optimal working state, that is, the photovoltaic module 200 works in the peak area of ​​the PV curve (power-voltage curve). Exemplarily, the photovoltaic optimizer 100 can have a DC-DC (direct current-direct current) conversion circuit, and the DC-DC conversion circuit can convert the input voltage and output voltage of the photovoltaic optimizer 100 to optimize the power output of the photovoltaic module 200. For example, the 10V input voltage of the photovoltaic optimizer 100 can be converted into an output voltage of 5V by adjusting the DC-DC conversion circuit, so that the output current of the photovoltaic module 200 before adjustment by the photovoltaic optimizer 100 is converted from 5A to 10A.

[0057] It is understandable that in the actual operation of the photovoltaic system 1000, for each photovoltaic string 400, due to factors such as shadow obstruction, inconsistent orientation of each photovoltaic module 200, differences in electrical specifications of each photovoltaic module 200 (such as parameters such as voltage, current and temperature of each photovoltaic module 200), damage, etc., it is easy to cause the output current of the affected photovoltaic module 200 to decrease, thereby causing the overall output current of the photovoltaic string 400 to decrease. The reduction in the output current of the affected photovoltaic module 200 means that the output power of the photovoltaic module 200 is reduced, resulting in a reduction in the overall output power of the photovoltaic system 1000 and a reduction in the power generation of the photovoltaic system 1000. Among them, the output power of the photovoltaic module 200 can be understood as the electrical energy output per unit time of the photovoltaic module 200.

[0058] By connecting the photovoltaic optimizer 100 in series with the photovoltaic module 200, when the output current of the photovoltaic module 200 is reduced due to the above-mentioned adverse factors, the output voltage of the photovoltaic module 200 can be adjusted to compensate for the output current of the photovoltaic module 200, thereby achieving the maximum power output of the photovoltaic module 200, which is beneficial to improving the power generation of the photovoltaic system 1000. In other words, the photovoltaic optimizer 100 can solve the influence of the photovoltaic module 200 on the power generation due to shadow shading, inconsistent orientation or different electrical specifications of the photovoltaic module 200, achieve the maximum power output of the photovoltaic module 200, and improve the power generation of the photovoltaic system 1000.

[0059] The number of photovoltaic optimizers 100 can be multiple, and multiple photovoltaic optimizers 100 can be electrically connected to multiple photovoltaic modules 200. Exemplarily, each photovoltaic optimizer 100 can be electrically connected to one photovoltaic module 200. Alternatively, each photovoltaic optimizer 100 can also be electrically connected to two photovoltaic modules 200 or multiple photovoltaic modules 200 at the same time, and the number of photovoltaic modules 200 connected to one photovoltaic optimizer 100 is not specifically limited. The following will be described by taking the example of one photovoltaic optimizer 100 being electrically connected to one photovoltaic module 200, but it should be understood that it is not limited to this.

[0060] The power converter 300 can be electrically connected to the photovoltaic optimizer 100, thereby being indirectly electrically connected to the photovoltaic assembly 200 through the photovoltaic optimizer 100. Alternatively, the power converter 300 can be directly electrically connected to the photovoltaic assembly 200. The power converter 300 is used to convert the power of the direct current and supply power to the load. Among them, the power converter 300 can be an inverter or a DC converter, etc. Exemplarily, when the power converter 300 is an inverter, the power converter 300 can convert the direct current into alternating current to supply power to the load, and the load at this time can be an AC load such as a communication base station or household appliances in an AC power grid. When the power converter 300 is a DC converter, the power converter 300 can convert the direct current in the input power converter 300 into a direct current that meets the power demand of the load to supply power to the load, and the load at this time can be a DC load such as a battery.

[0061] In a possible application scenario, Figure 1 As shown, the number of photovoltaic modules 200 can be three, and the three photovoltaic modules 200 are connected in series to form a photovoltaic string 400. The number of photovoltaic optimizers 100 can be three, and the three photovoltaic optimizers 100 are electrically connected to the three photovoltaic modules 200 respectively according to the corresponding relationship that one photovoltaic optimizer 100 corresponds to one photovoltaic module 200. Each photovoltaic module 200 is electrically connected to the power converter 300 through a photovoltaic optimizer 100, that is, each photovoltaic optimizer 100 is electrically connected between a photovoltaic module 200 and the power converter 300. At this time, the photovoltaic optimizer 100 can adjust the output voltage of the photovoltaic module 200, and the power converter 300 can convert the output voltage of the photovoltaic module 200 into the rated voltage required by the load and supply it to the load.

[0062] In the actual operation of the photovoltaic string 400, the surrounding environment such as dark clouds, trees, high-rise buildings, dust, etc. may partially block one or more photovoltaic modules 200 in the photovoltaic string 400, making the light intensity of the photovoltaic module 200 affected by the blockage uneven, resulting in inconsistent electrical parameters of multiple photovoltaic modules 200 in the same photovoltaic string 400, and then causing the photovoltaic system 1000 to have a reduced output power phenomenon, which is called mismatch loss. The photovoltaic optimizer 100 can make the output current of the blocked photovoltaic module 200 consistent with the remaining photovoltaic modules 200 through adjustment, so that the remaining photovoltaic modules 200 can still output the maximum power, avoiding the loss of power generation due to mismatch loss, and improving the power generation of the photovoltaic system 1000.

[0063] It should be noted that, in this application scenario, each photovoltaic module 200 in the same photovoltaic string 400 is indirectly connected to the power converter 300 through a photovoltaic optimizer 100, but in other application scenarios, one or more photovoltaic modules 200 in the same photovoltaic string 400 can be directly connected to the power converter 300. In this case, the power converter 300 can directly convert the DC power output by the photovoltaic module 200.

[0064] See also Figure 3 , Figure 3 It is a schematic diagram of the assembly of the photovoltaic module 200 and the photovoltaic optimizer 100 provided in the embodiment of the present application.

[0065] For the convenience of description, we define Figure 3 The length direction of the photovoltaic optimizer 100 is the X-axis direction, the width direction of the photovoltaic optimizer 100 is the Y-axis direction, and the thickness direction of the photovoltaic optimizer 100 is the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are mutually perpendicular. The direction of the mounting surface 212 toward the lighting surface 211 is defined as the positive direction of the Z-axis, and the direction of the lighting surface 211 toward the mounting surface 212 is defined as the negative direction of the Z-axis. The terms "top", "bottom", "inside", "outside", etc. mentioned in the description of the embodiments of the present application are based on the attached specification. Figure 3 The description of the orientation shown is based on the positive direction of the Z axis as the “top”, the negative direction of the Z axis as the “bottom”, and the direction away from the interior of the photovoltaic optimizer 100 as the “outside”. The direction toward the interior of the photovoltaic optimizer 100 is the “inside”, which does not constitute a limitation on the photovoltaic optimizer 100 in actual application scenarios.

[0066] The photovoltaic module 200 may include a silicon wafer 210 and a frame 220 arranged around the outer periphery of the silicon wafer 210. The silicon wafer 210 includes a lighting surface 211 and a mounting surface 212. The lighting surface 211 and the mounting surface 212 are arranged opposite to each other along the thickness direction (i.e., the negative direction of the Z axis) of the silicon wafer 210. The lighting surface 211 is arranged toward the sun, and the mounting surface 212 is arranged away from the sun.

[0067] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 4 for Figure 3 A schematic structural diagram of a photovoltaic optimizer 100 is shown, Figure 5 for Figure 4 The exploded structural diagram of the photovoltaic optimizer 100 is shown. Figure 6 for Figure 4 The sectional structure diagram of the photovoltaic optimizer 100 along the AA plane is shown.

[0068] The photovoltaic optimizer 100 can be connected to the frame 220 of the photovoltaic module 200 and located on the side of the mounting surface 212 of the photovoltaic module 200 to avoid blocking the lighting surface 211 of the photovoltaic module 200 and affecting the conversion power of the photovoltaic module 200. The photovoltaic optimizer 100 may include a housing 70, a heating component 30, a heat spreader 40, a thermally conductive insulating powder 50 and a mounting plate 60.

[0069] The outer surface of the shell 70 is the appearance surface of the shell 70, and the outer surface of the shell 70 may include a first surface 71, a second surface 72 and a third surface 73. The first surface 71 of the shell 70 is the surface of the shell 70 facing away from the photovoltaic assembly 200, and the second surface 72 of the shell 70 is the surface of the shell 70 facing the photovoltaic assembly 200. The first surface 71 of the shell 70 and the second surface 72 of the shell 70 are arranged opposite to each other in the thickness direction (positive direction of the Z axis) of the photovoltaic optimizer 100, and the third surface 73 of the shell 70 is located on one side of the photovoltaic optimizer 100 along the length direction (negative direction of the X axis) and connected between the first surface 71 of the shell 70 and the second surface 72 of the shell 70. The shell 70 has a receiving cavity Q, and the receiving cavity Q can be used to receive components of the photovoltaic optimizer 100 such as the heating component 30, the heat spreader 40, and the thermally conductive insulating powder 50. The receiving cavity Q can have good sealing performance. The accommodating chamber Q includes a top wall 74, a bottom wall 75 and a peripheral side wall 76. The bottom wall 75 of the accommodating chamber Q and the top wall 74 of the accommodating chamber Q are arranged opposite to each other along the positive direction of the Z axis. The peripheral side wall 76 of the accommodating chamber Q is connected between the top wall 74 of the accommodating chamber Q and the bottom wall 75 of the accommodating chamber Q. The peripheral side wall 76 of the accommodating chamber Q is an inner surface of the housing 70 surrounding the central axis of the housing 70. The central axis of the housing 70 is parallel to the positive direction of the Z axis. In this embodiment, the housing 70 is made of a metal material to improve the heat dissipation efficiency of the photovoltaic optimizer 100. Exemplarily, the material of the housing 70 can be aluminum.

[0070] The shell 70 may have an injection hole S, which penetrates the shell 70 along the positive direction of the Z axis, and is connected to the accommodating cavity Q of the shell 70, and the injection hole S is used to inject the thermally conductive insulating powder 50 into the accommodating cavity Q. It can be understood that by providing the injection hole S on the shell 70 and making the injection hole S connected to the accommodating cavity Q in the shell 70, the thermally conductive insulating powder 50 can be introduced into the shell 70 from the outside of the shell 70, so that the thermally conductive insulating powder 50 can fill the accommodating cavity Q of the shell 70 more conveniently and quickly, effectively preventing the thermally conductive insulating powder 50 from splashing, and having better reliability.

[0071] In a possible implementation, the housing 70 may be an integrated structure. For example, the housing 70 may be an integrated structure formed by an integrated molding method. It is understood that when the housing 70 is an integrated structure, the overall structural strength of the housing 70 is high, and it is not easy to cause structural deformation during the connection and installation of the components in the photovoltaic optimizer 100.

[0072] In another possible implementation, the housing 70 may be a split structure. When the housing 70 is a split structure, the structures of the various parts of the housing 70 are relatively simple, the processing is relatively easy, and the production yield is relatively high.

[0073] The following description will be made by taking the housing 70 as a split structure as an example, but it should be understood that the present invention is not limited thereto.

[0074] Please refer to Figure 4 and Figure 5 , the housing 70 may include a first shell 10 and a second shell 20. The first shell 10 has a first cavity A1 and a first opening B, the first opening B is provided on the surface of the first shell 10 facing the second shell 20, and the first opening B is connected to the first cavity A1. The second shell 20 has a second cavity A2 and a second opening C, the second opening C is provided on the surface of the second shell 20 facing the first shell 10, and the second opening C is connected to the second cavity A2. Exemplarily, the injection hole S may be located in the second shell 20, and the injection hole S penetrates the second shell 20 along the positive direction of the Z axis, that is, penetrates the second surface 72 and the top wall 74 of the accommodating cavity Q.

[0075] The second shell 20 and the first shell 10 are joined and spliced ​​along the positive direction of the Z axis to form a housing 70. Specifically, the second opening C of the second shell 20 is joined with the first opening B of the first shell 10, the end surface of the second shell 20 facing the first shell 10 is connected with the end surface of the first shell 10 facing the second shell 20, and the second cavity A2 of the second shell 20 is spliced ​​with the first cavity A1 of the first shell 10 to form a accommodating cavity Q. Exemplarily, the second shell 20 and the first shell 10 can be fixedly connected by means such as welding, bonding, clamping, screwing, etc. Under this setting, the first shell 10 and the second shell 20 can have a better connection stability, so that the housing 70 formed by splicing the first shell 10 and the second shell 20 can have better structural stability and is not easy to deform.

[0076] In a possible implementation, the photovoltaic optimizer 100 may further include a sealant N, which is sandwiched between the second shell 20 and the first shell 10, and the second shell 20 and the first shell 10 are sealed and connected. Therefore, the specific connection method between the second shell 20 and the first shell 10 is not limited. Exemplarily, a groove may be provided on the surface of the first shell 10 facing the second shell 20, and the sealant N is provided in the groove, so that the sealant N is sandwiched between the second shell 20 and the first shell 10. Alternatively, a groove may be provided on the surface of the second shell 20 facing the first shell 10, and the sealant N is provided in the groove, so that the sealant N is sandwiched between the second shell 20 and the first shell 10. Alternatively, a groove may be provided on the surface of the first shell 10 facing the second shell 20 and the surface of the second shell 20 facing the first shell 10, respectively, and the two grooves are connected to each other, so that the sealant N is provided in the two grooves, so that the sealant N is sandwiched between the second shell 20 and the first shell 10.

[0077] It is understandable that, since the housing 70 is composed of the first shell 10 and the second shell 20, the first shell 10 and the second shell 20 are prone to poor airtightness due to gaps, assembly tolerances, and other issues during assembly. By providing a seal N between the first shell 10 and the second shell 20, the first shell 10 and the second shell 20 can have good sealing performance, and the accommodating cavity Q formed by the splicing of the first shell 10 and the second shell 20 can have good airtightness and better reliability.

[0078] Please refer to Figure 3 , Figure 4 and Figure 5The mounting plate 60 is fixedly connected to the housing 70, and the mounting plate 60 is protruded relative to the outer peripheral surface of the housing 70, wherein the outer peripheral surface of the housing 70 refers to the surface surrounding the central axis of the housing 70, and the central axis of the housing 70 is parallel to the positive direction of the Z axis. The mounting plate 60 can be made of metal material, and the mounting plate 60 made of metal material has good heat dissipation performance, which can effectively increase the heat dissipation area between the photovoltaic optimizer 100 and the air, and improve the heat dissipation efficiency of the photovoltaic optimizer 100. The housing 70 can be detachably connected to the photovoltaic module 200 through the mounting plate 60, thereby realizing the fixed connection between the photovoltaic optimizer 100 and the photovoltaic module 200.

[0079] For example, please refer to Figure 3 and Figure 4 The mounting plate 60 may have a hanging hole 61, and the hanging hole 61 penetrates the mounting plate 60 along the thickness direction of the mounting plate 60. For example, the shape of the hanging hole 61 may be Z-shaped, and the hanging hole 61 may penetrate the mounting plate 60 along the thickness direction of the mounting plate 60, and penetrate the surface of the mounting plate 60 on the negative side of the X-axis. Of course, the shape of the hanging hole 61 is not limited to Figure 4 The Z-shape shown can also be other shapes such as round, square, etc. The embodiment of the present application does not strictly require the shape and setting position of the hanging hole 61. The frame 220 of the photovoltaic module 200 can be provided with a protrusion, and the hanging hole 61 of the mounting plate 60 is connected to the protrusion of the frame 220, so as to achieve a fixed connection between the photovoltaic optimizer 100 and the photovoltaic module 200. Of course, the mounting plate 60 of the photovoltaic optimizer 100 can also be snap-fitted, bonded or screwed to the frame 220 of the photovoltaic module 200, and the specific connection method is not limited.

[0080] It is understandable that, since the mounting plate 60 of the photovoltaic optimizer 100 is fixedly connected to the frame 220 of the photovoltaic module 200, and the mounting plate of the photovoltaic optimizer 100 is made of metal material, the mounting plate 60 made of metal material has good heat dissipation performance, which is conducive to quickly transferring the heat of the housing 70 to the photovoltaic module 200, realizing rapid heat dissipation of the photovoltaic optimizer 100, and improving the heat dissipation capacity of the photovoltaic optimizer 100.

[0081] For a possible implementation, see Figure 4 The mounting plate 60 and the housing 70 are of a split structure. The mounting plate 60 can be mounted on the second surface 72 of the housing 70. A surface of the mounting plate 60 along the negative direction of the Z axis can be fixedly connected to the second surface 72 of the housing 70. The mounting plate 60 protrudes from the third surface 73 of the housing 70. The mounting plate 60 can be connected to the housing 70 by snapping, bonding or screwing, and the specific connection method is not limited.

[0082] For another possible implementation, see Figure 7 , Figure 7for Figure 3 Another structural schematic diagram of the photovoltaic optimizer 100 shown in FIG. 1 shows that the mounting plate 60 and the housing 70 are an integrated structure, and the mounting plate 60 is convexly arranged on the third surface 73 of the housing 70. Exemplarily, the mounting plate 60 can be formed into an integrated structure with the housing 70 by an integrated molding method. The integrated housing 70 and mounting plate 60 are conducive to reducing the assembly process of the photovoltaic optimizer 100, improving the assembly efficiency of the photovoltaic optimizer 100, and also conducive to reducing the thermal resistance of the connection and improving the heat dissipation efficiency of the photovoltaic optimizer 100.

[0083] Please refer to Figure 4 and Figure 6 In an embodiment of the present application, the photovoltaic optimizer 100 may further include a plurality of heat dissipation teeth 80. The plurality of heat dissipation teeth 80 are protruding from the outer surface of the outer shell 70, and the plurality of heat dissipation teeth 80 are spaced apart on the outer surface of the outer shell 70. The gap area between two adjacent heat dissipation teeth 80 forms a heat dissipation duct T. The plurality of heat dissipation teeth 80 form a plurality of heat dissipation ducts T. Exemplarily, the plurality of heat dissipation teeth 80 may be an integral structure formed with the outer shell 70 through an integral molding process. Alternatively, the plurality of heat dissipation teeth 80 may also be an integral structure formed with the outer shell 70 through assembly methods such as welding, bonding, clamping, and screwing. Alternatively, the plurality of heat dissipation teeth 80 may also be a split structure with the outer shell 70. The embodiment of the present application does not impose strict restrictions on the connection method between the heat dissipation teeth 80 and the outer shell 70. The material of the heat dissipation teeth 80 may be a metal material.

[0084] It can be understood that by forming a heat dissipation duct T in the gap area between two adjacent heat dissipation teeth 80, the heat dissipation area of ​​the outer shell 70 in contact with the air can be increased, so that the heated hot air in the heat dissipation duct T flows to the outside of the heat dissipation duct T, and the cold air outside the heat dissipation duct T enters the heat dissipation duct T, and then the heat on the outer shell 70 can be quickly transferred to the external environment of the photovoltaic optimizer 100 through the circulation of hot and cold air, thereby improving the convective heat exchange level of natural heat dissipation of the photovoltaic optimizer 100, so that the photovoltaic optimizer 100 as a whole has excellent heat dissipation performance, and effectively improves the heat dissipation efficiency of the photovoltaic optimizer 100.

[0085] In a possible implementation, Figure 5 and Figure 6As shown, the plurality of heat dissipation teeth 80 may include a plurality of first teeth 81, the plurality of first teeth 81 are protruding from the first surface 71 of the housing 70, one end of each first tooth 81 is connected to the first surface 71 of the housing 70, and the other end of each first tooth 81 extends in a direction away from the first surface 71 of the housing 70 (i.e., the negative direction of the Z axis). The plurality of first teeth 81 are arranged at intervals along the width direction (positive direction of the Y axis) of the housing 70. The gap area between two adjacent first teeth 81 forms a first air duct T1. The plurality of first teeth 81 form a plurality of first air ducts T1.

[0086] It can be understood that the first surface 71 of the shell 70 is the surface of the shell 70 facing away from the photovoltaic module 200. By setting multiple first teeth 81 on the first surface 71 of the shell 70, the heat dissipation teeth 80 can have a larger structural setting space without affecting the assembly reliability of the photovoltaic optimizer 100 and the photovoltaic module 200, and can more fully contact the air in the external environment of the photovoltaic optimizer 100, which is beneficial to improving the heat dissipation performance of the photovoltaic optimizer 100.

[0087] For another possible implementation, see Figure 8 and Fig. 9 , Figure 8 for Figure 3 Another structural schematic diagram of the photovoltaic optimizer 100 is shown. Fig. 9 for Figure 3 The sectional structure diagram of the photovoltaic assembly 200 and the photovoltaic optimizer 100 along the BB plane is shown. The same contents as the previous embodiment are not repeated here. Unlike the previous embodiment, the plurality of heat dissipation teeth 80 also include a plurality of second teeth 82. The plurality of second teeth 82 are protruding from the second surface 72 of the outer shell 70, one end of each second tooth 82 is connected to the second surface 72 of the outer shell 70, and the other end of each second tooth 82 extends in a direction away from the second surface 72 of the outer shell 70 (i.e., the positive direction of the Z axis). The plurality of second teeth 82 are also located in the gap area between the outer shell 70 of the photovoltaic optimizer 100 and the photovoltaic assembly 200, and the plurality of second teeth 82 are spaced apart along the positive direction of the Y axis, and the gap area between two adjacent second teeth 82 forms a second air duct T2. The plurality of second teeth 82 form a plurality of second air ducts T2.

[0088] It can be understood that since there is a gap between the outer shell 70 of the photovoltaic optimizer 100 and the photovoltaic component 200, the second surface 72 of the outer shell 70 is the surface of the outer shell 70 facing the photovoltaic component 200, and therefore the plurality of second teeth 82 are arranged on the second surface 72 of the outer shell 70, so that the plurality of second teeth 82 can be located in the gap area between the outer shell 70 of the photovoltaic optimizer 100 and the photovoltaic component 200, thereby making full use of the idle space between the outer shell 70 of the photovoltaic optimizer 100 and the photovoltaic component 200, and further increasing the heat dissipation surface area of ​​the outer shell 70 in contact with the air, thereby improving the heat dissipation efficiency of the photovoltaic optimizer 100.

[0089] Please refer to Figure 5 and Figure 6 In the embodiment of the present application, the heating component 30 is located in the accommodation cavity Q of the housing 70. The heating component 30 may include a circuit board 31 and an electronic device 32.

[0090] The circuit board 31 can be electrically connected to the photovoltaic module 200 and the power converter 300. The circuit board 31 may include a first connection surface 33, a second connection surface 34 and a side surface 35. The first connection surface 33 and the second connection surface 34 are arranged opposite to each other in the thickness direction (positive direction of the Z axis) of the circuit board 31, and the side surface 35 is connected between the first connection surface 33 and the second connection surface 34, wherein the side surface 35 is a surface surrounding the central axis of the circuit board 31, and the central axis of the circuit board 31 is parallel to the positive direction of the Z axis. The first connection surface 33 of the circuit board 31 faces the bottom wall 75 of the accommodating cavity Q, and the second connection surface 34 of the circuit board 31 faces the top wall 74 of the accommodating cavity Q. Exemplarily, the circuit board 31 can be fixedly connected to the housing 70, such as the circuit board 31 can be fixedly connected to the housing 70 by screwing.

[0091] The circuit board 31 can be a single-sided board or a double-sided board. A single-sided board means that the electronic device 32 is only arranged on the first connection surface 33 or the second connection surface 34 of the circuit board 31, and a double-sided board means that the electronic device 32 can be arranged on both the first connection surface 33 and the second connection surface 34 of the circuit board 31. Exemplarily, the circuit board 31 can be connected to the photovoltaic module 200 and the power converter 300 through a cable.

[0092] The electronic device 32 is mounted on the circuit board 31 and is electrically connected to the circuit board 31. Exemplarily, the number of electronic devices 32 can be multiple, and multiple electronic devices 32 can be arranged at intervals on the circuit board 31. The types of electronic devices 32 can be, but are not limited to, power switching devices, such as MOSFET (Metal Oxide Semiconductor Field Effect Transistor), GaN (Gallium Nitride), diodes, SiC (Silicon Carbide). Or magnetic devices, such as inductors, transformers, and mutual inductors. Or resistors and capacitors, such as MLCC (Multi-layer Ceramic Capacitors), chip resistors. Or signal sampling and transmission devices, such as ADC (Analog-to-Digital Converter), operational amplifiers, comparators, optocouplers, and magnetic couplers.

[0093] In a possible implementation manner, there may be a plurality of electronic components 32 , and the plurality of electronic components 32 are all connected to the first connection surface 33 of the circuit board 31 .

[0094] In another possible implementation manner, there may be a plurality of electronic components 32 , and the plurality of electronic components 32 are all connected to the second connection surface 34 of the circuit board 31 .

[0095] In another possible implementation, the number of electronic devices 32 may be multiple, and multiple electronic devices 32 are connected to the first connection surface 33 or the second connection surface 34 of the circuit board 31. Thus, the electronic devices 32 disposed on both sides of the circuit board 31 can add a layer of device layout relative to the devices disposed on only one side of the circuit board 31, thereby significantly improving the device arrangement density of the photovoltaic optimizer 100.

[0096] It should be noted that the number and location of the electronic devices 32 can be selected according to the application requirements of the photovoltaic optimizer 100, and the embodiments of the present application do not impose strict restrictions on this. The following will be described by taking the example that all electronic devices 32 are installed on the first connection surface 33, but it should be understood that this is not limited to this.

[0097] See also Figure 6 In an embodiment of the present application, the heating component 30 may further include a metal column, which is fixedly connected to the circuit board 31 and spaced apart from the electronic device 32 disposed on the circuit board 31. The metal column may be used to transfer heat generated by the circuit board 31 and the electronic device 32. The metal column may include a first metal column 36 and / or a second metal column 37. Exemplarily, the first metal column 36 and the second metal column 37 are both copper columns.

[0098] The first metal column 36 can be connected to the first connection surface 33 and / or the second connection surface 34 of the circuit board 31. The first metal column 36 is spaced apart from the electronic device 32 disposed on the first connection surface 33 and / or the second connection surface 34. Exemplarily, the number of the first metal column 36 can be multiple, and the multiple first metal columns 36 are all connected to the first connection surface 33 of the circuit board 31, and are arranged around the electronic device 32 connected to the first connection surface 33. It can be understood that by arranging the first metal column 36 on the circuit board 31, the heat dissipation area of ​​the heating component 30 can be increased, so that the heat generated by the heating component 30 can be dissipated outward through the first metal column 36, which is conducive to improving the heat dissipation efficiency of the heating component 30.

[0099] The second metal column 37 can be connected to the side 35 of the circuit board 31, and the end of the second metal column 37 away from the circuit board 31 is opposite to and spaced from the peripheral side wall 76 of the accommodating cavity Q. It can be understood that the side 35 of the circuit board 31 is the surface of the circuit board 31 where no electronic device 32 is arranged. The second metal column 37 is arranged on the side 35 of the circuit board 31, which can make full use of the layout space of the circuit board 31. On the basis of further increasing the heat dissipation area of ​​the heating component 30, more board space on the circuit board 31 is released to arrange more electronic devices 32, which is conducive to improving the device arrangement density of the photovoltaic optimizer 100.

[0100] It should be noted that the heating component 30 is not limited to the circuit board 31 and the electronic device 32 listed above. In some embodiments, the heating component 30 may also include other structural parts such as a shielding cover or a bracket, and the embodiments of the present application do not impose strict restrictions on this.

[0101] See also Figure 6 , the heat spreader 40 is located in the accommodating cavity Q of the housing 70, and is located between the heating component 30 and the bottom wall 75 of the accommodating cavity Q. The heat spreader 40 is fixedly connected to the first connecting surface 33 of the circuit board 31, and is in contact with or spaced apart from the end of the first metal column 36 disposed on the first connecting surface 33 that is away from the circuit board 31. It can be understood that the electronic device 32 connected to the first connecting surface 33 is located between the heat spreader 40 and the circuit board 31. The projection of the heat spreader 40 on the circuit board 31 can cover the electronic device 32 disposed on the first connecting surface 33. By fixing the heat spreader 40 to the circuit board 31, the heat spreader 40 can quickly absorb the heat transmitted from the first metal column 36 and the electronic device 32 and transfer it to the outside, thereby improving the heat dissipation efficiency of the photovoltaic optimizer 100.

[0102] See also Figure 6In the embodiment of the present application, the thermally conductive insulating powder 50 can be injected into the accommodating cavity Q of the shell 70 through the injection hole S of the shell 70. The thermally conductive insulating powder 50 will enter the accommodating cavity Q through the injection hole S and fill the gap between the cavity wall of the accommodating cavity Q and the heating component 30 and the heat spreader 40. Specifically, since the injection hole S is provided in the second shell 20 and penetrates the second surface 72 of the shell 70 and the top wall 74 of the accommodating cavity Q along the positive direction of the Z axis, after the thermally conductive insulating powder 50 enters the accommodating cavity Q through the injection hole S, it will first be deposited in the gap of the first cavity A1 of the first shell 10 due to its own weight, and then fill the gap of the second cavity A2 of the second shell 20, thereby achieving full filling of the gap between the shell 70 and the heating component 30 and the heat spreader 40, avoiding the phenomenon of reducing the heat dissipation area and forming a local hot spot in the photovoltaic optimizer 100 due to the thermally conductive insulating powder 50 not fully filling the gap. After the thermally conductive insulating powder 50 fully fills the gap, the injection hole S will be blocked.

[0103] It is understandable that when the photovoltaic optimizer 100 is working, the heating component 30 inside the photovoltaic optimizer 100 will continue to generate heat, and if the heat of the heating component 30 is not dissipated in time, it will affect the reliability of the photovoltaic optimizer 100, and further affect the efficiency of the entire photovoltaic system 1000. In particular, as the power density of the photovoltaic optimizer 100 continues to increase, the heat dissipation performance of the photovoltaic optimizer 100 is increasingly becoming an important factor affecting the efficiency of the photovoltaic system 1000.

[0104] In the related art, the interior of the photovoltaic optimizer is filled with thermally conductive glue to transfer the heat generated by the heating device to the outer shell through the thermally conductive glue and achieve heat dissipation. The thermal conductivity of the thermally conductive glue is generally low, for example, between 0.3 watts / (meter*degree) (W / (m*K), where K can be replaced by ℃)-1W / (m*K). When a thermally conductive glue with a low thermal conductivity is used, although the encapsulation inside the outer shell can be achieved, the low thermal conductivity of the thermally conductive glue can easily lead to poor heat dissipation effect and low heat dissipation efficiency of the photovoltaic optimizer, and it is easy to form local hot spots on the outer shell of the photovoltaic optimizer. When a thermally conductive glue with a high thermal conductivity is used, the flowability of the thermally conductive glue will deteriorate due to the increase in the thermal conductivity of the thermally conductive glue. The deterioration of the flowability of the thermally conductive glue will make it difficult to achieve encapsulation, reduce the heat dissipation area of ​​the photovoltaic optimizer, and also easily form local hot spots on the outer shell of the photovoltaic optimizer.

[0105] Therefore, in the embodiment of the present application, by making the shell 70 made of metal material, the overall heat dissipation performance of the photovoltaic optimizer 100 can be effectively increased due to the excellent heat dissipation capacity of the metal material. In addition, since the shell 70 is made of metal material, the metal material also has good electrical conductivity, so the heat-conducting insulating powder 50 is filled in the accommodating cavity Q of the shell 70, so that the heat-conducting insulating powder 50 can separate the heating component 30 from the shell 70 made of metal material, respectively, so that the heating component 30 is insulated from the shell 70 made of metal material, and the safety specification requirements of the photovoltaic optimizer 100 are met. Moreover, the heat-conducting insulating powder 50 is a powdered solid, and compared with the thermal conductive glue, there is no problem of poor fluidity, and it is easier to achieve sufficient filling, ensuring the contact area between the electronic device 32 and the circuit board 31 and the heat-conducting insulating powder 50. The heat-conducting insulating powder 50 can also transfer the heat generated by the electronic device 32 to the metal shell 70, and then to the air around the shell 70, which accelerates the heat dissipation speed of the photovoltaic optimizer 100 and improves the heat dissipation stability of the photovoltaic optimizer 100.

[0106] In addition, in the embodiment of the present application, the thermally conductive insulating powder 50 is made of a material with a relatively large thermal conductivity, such as alumina, aluminum nitride or silicon nitride. Compared with thermally conductive adhesives with relatively low thermal conductivity [0.5W / (m*K) to 2.5W / (m*K)], the thermally conductive insulating powder 50 provided in the present embodiment has a high thermal conductivity, for example, the thermal conductivity of alumina is about 10W / (m*K), and has a higher efficiency in transferring heat, which is more conducive to improving the rapid heat dissipation capability of the photovoltaic optimizer 100.

[0107] In a possible implementation, please refer to Figure 7 and Fig.10 , Fig.10 for Figure 7 The PV optimizer 100 is shown as a cross-sectional structural diagram along the CC plane.

[0108] The photovoltaic optimizer 100 may further include an insulating layer 90, the insulating layer 90 covers at least a portion of the cavity wall of the accommodating cavity Q, and the insulating layer 90 is in contact with the thermally conductive insulating powder 50. It is understandable that by providing the insulating layer 90 on the cavity wall of the accommodating cavity Q, the insulating layer 90 can cooperate with the thermally conductive insulating powder 50 to further enhance the insulation effect between the housing 70 of the photovoltaic optimizer 100 and the heating component 30, so that the photovoltaic optimizer 100 is not easily failed due to electrical conduction between the housing 70 of the photovoltaic optimizer 100 and the heating component 30, thereby effectively improving the working reliability of the photovoltaic optimizer 100.

[0109] In this embodiment, the insulating layer 90 may include a first layer 91 and a second layer 92. The first layer 91 is disposed on the top wall 74 of the accommodating cavity Q, and the orthographic projection of the heating component 30 on the top wall 74 of the accommodating cavity Q may fall within the range of the orthographic projection of the first layer 91 on the top wall 74 of the accommodating cavity Q. The second layer 92 is disposed on the bottom wall 75 of the accommodating cavity Q. The orthographic projection of the heating component 30 on the bottom wall 75 of the accommodating cavity Q may fall within the range of the orthographic projection of the second layer 92 on the bottom wall 75 of the accommodating cavity Q. The first layer 91 and the second layer 92 are arranged opposite to each other along the negative direction of the Z axis. The materials of the first layer 91 and the second layer 92 are both insulating varnishes with good electrical insulation properties. Among them, the first layer 91 and the second layer 92 can be formed by applying the insulating varnish to the top wall 74 and the bottom wall 75 of the accommodating cavity Q, respectively, and curing them. The first layer 91 can separate the heating component 30 from the top wall 74 of the accommodating cavity Q, and the second layer 92 can separate the heating component 30 from the bottom wall 75 of the accommodating cavity Q, so that the heating component 30 is further insulated from the housing 70, and the safety specification requirements of the photovoltaic optimizer 100 are fully guaranteed. In addition, by providing the first layer 91 and the second layer 92, the size of the filled thermally conductive insulating powder 50 along the Z-axis direction can be reduced, and the volume of the filled thermally conductive insulating powder 50 can be reduced, thereby reducing the amount of the thermally conductive insulating powder 50, and reducing the manufacturing cost of the photovoltaic optimizer 100.

[0110] Furthermore, the insulating layer 90 may also include a third layer 93 and a fourth layer 94. The third layer 93 is provided on the peripheral side wall 76 of the second cavity A2, and the fourth layer 94 is provided on the peripheral side wall 76 of the first cavity A1. The third layer 93 can separate the heating component 30 from the peripheral side wall 76 of the second cavity A2, and the fourth layer 94 can separate the heating component 30 from the peripheral side wall 76 of the first cavity A1, so that the heating component 30 is further insulated from the second shell 20 and the first shell 10, and the safety specification requirements of the photovoltaic optimizer 100 are fully guaranteed. In addition, by providing the third layer 93 and the fourth layer 94, the size of the filled thermally conductive insulating powder 50 along the X-axis and Y-axis directions can be further reduced, and the volume of the filled thermally conductive insulating powder 50 can be reduced, thereby reducing the amount of the thermally conductive insulating powder 50, and reducing the manufacturing cost of the photovoltaic optimizer 100.

[0111] The structure of the photovoltaic optimizer 100 provided in the embodiment of the present application can also be applied to small box-type devices such as power adapters or micro inverters, and the specific application scenarios are not limited.

[0112] The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic optimizer, characterized in that: include: A shell, wherein the shell is made of a metal material and has a receiving cavity; A heating component, wherein the heating component is located in the accommodating cavity; and Thermally conductive insulating powder, the thermally conductive insulating powder is located in the accommodating cavity, the thermally conductive insulating powder fills the gap between the cavity wall of the accommodating cavity and the heating component, the thermally conductive insulating powder is used to insulate the heating component from the outer shell, and is used to transfer the heat generated by the heating component to the outer shell.

2. The photovoltaic optimizer according to claim 1, characterized in that: The photovoltaic optimizer further includes an insulating layer, which covers at least a portion of a cavity wall of the accommodating cavity, and the insulating layer is in contact with the thermally conductive insulating powder.

3. The photovoltaic optimizer according to claim 2, characterized in that: The accommodating cavity comprises a top wall and a bottom wall, the bottom wall, the heating component and the top wall are sequentially arranged in the thickness direction of the accommodating cavity, and the insulating layer comprises a first layer and a second layer; The first layer is disposed on the top wall and in contact with the thermally conductive insulating powder, and the second layer is disposed on the bottom wall and in contact with the thermally conductive insulating powder.

4. The photovoltaic optimizer according to any one of claims 1 to 3, characterized in that: The photovoltaic optimizer also includes a plurality of heat dissipation teeth, which are connected to the outer surface of the shell, and are arranged at intervals, and the gap area between two adjacent heat dissipation teeth forms a heat dissipation air duct.

5. The photovoltaic optimizer according to claim 4, characterized in that: The outer surface of the housing comprises a first surface and a second surface, the second surface and the first surface are arranged opposite to each other in the thickness direction of the photovoltaic optimizer, the first surface faces away from the photovoltaic assembly, and the second surface faces toward the photovoltaic assembly; The multiple heat dissipation teeth include multiple first teeth and multiple second teeth, the multiple first teeth are protruded on the first surface, the multiple first teeth are arranged at intervals, and the gap area between two adjacent first teeth forms a first air duct, and the multiple second teeth are protruded on the second surface, the multiple second teeth are arranged at intervals, and the gap area between two adjacent second teeth forms a second air duct.

6. The photovoltaic optimizer according to any one of claims 1 to 5, characterized in that: The heat generating component comprises a circuit board and an electronic device, the circuit board comprises a first connection surface and a second connection surface, the first connection surface and the second connection surface are arranged opposite to each other along the thickness direction of the circuit board, and the electronic device is connected to the first connection surface and / or the second connection surface; The photovoltaic optimizer further includes a vapor chamber, wherein the vapor chamber is connected to the first connection surface, and the electronic device connected to the first connection surface is located between the vapor chamber and the circuit board.

7. The photovoltaic optimizer according to claim 6, characterized in that: The heat generating component further includes a first metal column, which is connected to the first connection surface and / or the second connection surface, and is spaced apart from the electronic device. The first metal column connected to the first connection surface is in contact with or spaced apart from the heat spreader.

8. The photovoltaic optimizer according to claim 7, characterized in that: The heat generating component further includes a second metal column, the circuit board further includes a side surface, the side surface is connected between the first connection surface and the second connection surface, and the second metal column is connected to the side surface.

9. The photovoltaic optimizer according to any one of claims 1 to 8, characterized in that: The housing comprises a first shell and a second shell, the second shell and the first shell are arranged opposite to each other in the thickness direction of the photovoltaic optimizer, and the first shell and the second shell cooperate to form the accommodating cavity; The photovoltaic optimizer further includes a seal, which is sandwiched between the first shell and the second shell and seals the first shell and the second shell.

10. A photovoltaic system, characterized in that: It comprises a photovoltaic component, a power converter and a photovoltaic optimizer as described in any one of claims 1 to 9, wherein the photovoltaic optimizer is connected between the photovoltaic component and the power converter.

11. The photovoltaic system according to claim 10, characterized in that: The photovoltaic optimizer also includes a mounting plate, which is connected to the housing. The mounting plate is protruding relative to the outer peripheral surface of the housing, and the housing is detachably connected to the photovoltaic assembly through the mounting plate.

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