Power conversion device

Abstract

The application relates to a power conversion device. The device comprises a housing, a circuit board arranged in the housing, an alternating current joint arranged on the housing and electrically connected with the circuit board, and a plurality of direct current joints arranged on the housing and electrically connected with the circuit board, and the alternating current joint and all the direct current joints are arranged on the same side of the housing. The alternating current joint and all the direct current joints are arranged on the same side of the housing, which facilitates the wiring between the power conversion devices and the wiring between the direct current joints and the solar cell panel, thus reasonably improving the installation space of the power conversion device, avoiding the limitation of the installation space, facilitating the rapid installation of the power conversion device, and finally improving the work efficiency during the installation of the power conversion device.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a power conversion device. Background Technology

[0002] With the rapid development of new energy technologies, solar energy is widely used in daily production and life due to its advantages such as being pollution-free and sustainable. Generally, solar energy can be converted into electrical energy through photovoltaic power generation technology. The direct current (DC) generated by photovoltaic power generation is then converted into alternating current (AC) through a power conversion device. This AC power can then be used as electrical energy and input into the power grid through a connector. The AC power can also be converted back into DC through the same power conversion device. However, traditional power conversion devices typically have drawbacks such as occupying a large installation space and being cumbersome to install, thus affecting installation efficiency. Utility Model Content

[0003] One technical problem addressed by this application is how to improve the operating efficiency of power conversion devices during installation.

[0004] A power conversion device, comprising:

[0005] case;

[0006] A circuit board, wherein the circuit board is disposed within the housing;

[0007] An AC connector, wherein the AC connector is disposed on the housing and electrically connected to the circuit board; and

[0008] A plurality of DC connectors are provided on the housing and electrically connected to the circuit board, and the AC connectors and all the DC connectors are on the same side of the housing.

[0009] In one embodiment, a mounting plate is also included. The housing includes a first shell connected to the mounting plate. With the thickness direction of the housing as a reference direction, the first shell has a first surface that is furthest from the circuit board in the reference direction, and the mounting plate has a second surface that is furthest from the circuit board in the reference direction. The distance from the first surface to the circuit board is greater than or equal to the distance from the second surface to the circuit board.

[0010] In one embodiment, the first housing has a contoured structure that matches the shape of electronic components disposed on the circuit board, the edge of the mounting plate is adapted to the contoured structure, and the mounting plate is capable of abutting against the contoured structure along a direction perpendicular to the reference direction.

[0011] In one embodiment, the direction in which the mounting plate abuts against the contoured structure is denoted as the first direction, and the direction perpendicular to both the first direction and the reference direction is denoted as the second direction. The mounting plate has a first through hole and a second through hole that are interconnected and extend along the first direction. The first through hole and the second through hole are arranged along the second direction. The mounting plate has a reference edge that extends along the second direction and is located outside the housing. The first through hole extends to the reference edge, and the second through hole is spaced apart from the reference edge. The end of the second through hole that is farther away from the reference edge is farther away from the reference edge than the first through hole.

[0012] In one embodiment, one of the first shell and the mounting plate is provided with a positioning hole and the other includes a protrusion extending along the reference direction and engaging with the positioning hole.

[0013] In one embodiment, the mounting plate is bolted to the first housing.

[0014] In one embodiment, the housing further includes a second housing connected to the first housing and forming a receiving cavity, the circuit board being located in the receiving cavity, the second housing including a sidewall, a bottom plate and a protrusion, the sidewall being disposed around the bottom plate and connected to the first housing, the bottom plate being spaced apart from the circuit board along the reference direction, and the bottom plate having an inner surface facing the circuit board, the protrusion being protruding from the inner surface.

[0015] In one embodiment, the protrusion includes a plurality of rectangular strips arranged sequentially from the inside out, with the centers of all the rectangular strips overlapping each other.

[0016] In one embodiment, at least one of the following schemes is also included:

[0017] The protrusion also includes a first connecting strip, which connects the vertices of the rectangular strip;

[0018] The protrusion further includes a second connecting strip, which connects the midpoint of the long side of each of the rectangular strips; and / or, the second connecting strip connects the midpoint of the short side of each of the rectangular strips.

[0019] In one embodiment, a heat spreader is further included. The housing also includes a second housing connected to the first housing and forming a receiving cavity. The circuit board is located in the receiving cavity. The second housing includes a side wall and a bottom plate. The side wall is disposed around the bottom plate and connected to the first housing. The bottom plate is spaced apart from the circuit board along the reference direction. The heat spreader is located between the bottom plate and the circuit board, and the heat spreader is spaced apart from the bottom plate.

[0020] In one embodiment, all of the DC connectors are located on the same side of the AC connector.

[0021] In one embodiment, the device further includes a binding sleeve and two connecting wires, the two connecting wires being connected to two interfaces of the DC connector respectively, and both connecting wires being fixedly connected to the binding sleeve and passing through the binding sleeve.

[0022] One technical advantage of one embodiment of this application is that by placing the AC connectors and all DC connectors on the same side of the housing, wiring between various power conversion devices is facilitated. When wiring between the DC connectors and the solar panels, only one side of the space is occupied, thus reasonably increasing the installation space for the power conversion devices and avoiding space constraints. This facilitates rapid installation of the power conversion devices and ultimately improves the efficiency of installation. Furthermore, given the multiple DC connectors, which can be equal to and correspond one-to-one with the number of solar panels, the solar panels can be mounted on spaced-apart first and second supports, while the power conversion devices can be mounted on the first support. Since the power conversion devices can be wired from the same side, without occupying the space between adjacent solar panels, the area of ​​the solar panels that can be installed in the power conversion device is maximized. Moreover, the side where the AC and DC connectors are installed can be placed away from the first support, further avoiding interference from the first support and improving the efficiency of installation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a power conversion device provided in one embodiment.

[0024] Figure 2 for Figure 1 A three-dimensional cross-sectional view of the power conversion device shown.

[0025] Figure 3 for Figure 1 The diagram shows a first example exploded structure of the power conversion device.

[0026] Figure 4 for Figure 1 The second example exploded structural diagram of the power conversion device shown.

[0027] Figure 5 for Figure 1 The diagram shows a planar structure of the second shell in the power conversion device.

[0028] Figure 6This is a schematic diagram of the planar structure of the bonding sleeve and the connecting wire in a power conversion device provided in one embodiment.

[0029] Figure 7 for Figure 1 The diagram shows a simplified structural diagram of the power conversion device and solar panel installation.

[0030] Reference numerals: power conversion device 10, housing 100, first housing 110, first surface 111, second housing 120, bottom plate 121, inner surface 1211, side wall 122, protrusion 123, rectangular strip 1233, first connecting strip 1231, second connecting strip 1232, accommodating cavity 130, protrusion 140, circuit board 200, AC connector 310, DC connector 320, mounting plate 400, second surface 410, first through hole 421, second through hole 422, reference edge 430, positioning hole 440, heat spreader 500, binding sleeve 610, connecting wire 620. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figure 1 One embodiment of this application provides a power conversion device 10 including a housing 100, a circuit board 200, an AC connector 310, and a DC connector 320. The housing 100 forms a receiving cavity 130 (e.g., Figure 2 The circuit board 200 is located within the housing 100, specifically within the accommodating cavity 130. An AC connector 310 is used to transmit AC power. The AC connector 310 is mounted on the housing 100 and electrically connected to the circuit board 200. A DC connector 320 is used to transmit DC power. The DC connector 320 is mounted on the housing 100 and electrically connected to the circuit board 200. There are multiple DC connectors 320, and all DC connectors 320 and AC connectors 310 are spaced apart on the same side of the housing 100. There can be two DC connectors 320, or more.

[0038] See Figure 7 Therefore, by arranging all DC connectors 320 and AC connectors 310 on the same side of the housing 100, it facilitates wiring between the various power conversion devices 10. When wiring between the DC connectors 320 and the solar panels 20, only one side of the space is occupied, thus reasonably increasing the installation space of the power conversion devices 10 and avoiding space constraints. This facilitates quick installation of the power conversion devices 10 and ultimately improves the working efficiency of the power conversion devices 10 during installation. On the other hand, given that there are multiple DC connectors 320, the number of DC connectors 320 can be equal to and correspond one-to-one with the number of solar panels 20. Thus, when wiring between the power conversion devices 10 and the solar panels 20, the solar panels 20 can be installed on the spaced-apart first bracket 31 and second bracket 32, and the power conversion devices 10 can be installed on the first bracket 31. Since the power conversion devices 10 can be wired out on the same side without occupying the distance between two adjacent solar panels 20, the area of ​​the solar panels 20 that can be installed in the power conversion devices 10 is maximized. Furthermore, the side where the AC connector 310 and DC connector 320 are installed can be installed on the side away from the first bracket 31, which can further avoid interference from the first bracket 31, thereby improving the working efficiency of the power conversion device 10 during installation.

[0039] See Figure 1 In some embodiments, the power conversion device 10 further includes a mounting plate 400. During the installation of the power conversion device 10, the mounting plate 400 can be hooked onto other support members, thereby improving the stability and reliability of the installation of the power conversion device 10. The housing 100 includes a first housing 110 and a second housing 120, which together form a receiving cavity 130. The first housing 110 has a contoured structure. Electronic components are disposed on the circuit board 200. The electronic components can protrude at different heights relative to the circuit board 200. The contoured structure can match the shape of the electronic components. The contoured structure can be understood as an uneven structure suitable for electronic components that protrude at different heights relative to the circuit board 200. The second housing 120 may not have a contoured structure. The thickness direction of the housing 100 is used as a reference direction (e.g., Figure 1The reference direction (Z-axis direction) can be understood as the thickness direction of the circuit board 200 and the mounting plate 400. The first shell 110 has a first surface 111, which is furthest from the circuit board 200 in the reference direction, maximizing the distance between the first surface 111 and the circuit board 200 relative to the other surfaces of the first shell 110 in the reference direction. The mounting plate 400 has a second surface 410, which is also furthest from the circuit board 200 in the reference direction, maximizing the distance between the second surface 410 and the circuit board 200 relative to the other surfaces of the mounting plate 400 in the reference direction. Along the aforementioned reference direction, the distance from the first surface 111 to the circuit board 200 is greater than or equal to the distance from the second surface 410 to the circuit board 200, which can be understood as the second surface 410 not being higher than the first surface 410.

[0040] If the mounting plate is directly attached to the first surface, the thickness of the entire power conversion device will be roughly equal to the sum of the thicknesses of the housing and the mounting plate. This will increase the overall thickness of the power conversion device, making it difficult for the existing installation space to meet the installation requirements. This will affect the operational difficulty of the power conversion device during installation and ultimately affect the working efficiency of the power conversion device during installation.

[0041] Regarding the power conversion device 10 in the above embodiments, since the second surface 410 is not higher than the first surface 111, this effectively avoids directly attaching the mounting plate 400 to the first surface 111. This ensures that the thickness of the power conversion device 10 remains approximately equal to the thickness of the housing 100, rather than the sum of the thicknesses of the housing 100 and the mounting plate 400. Therefore, the existing installation space can easily meet the installation requirements of the power conversion device 10, reduce the operational difficulty of the power conversion device 10 during installation, and ultimately improve the working efficiency of the power conversion device 10 during installation.

[0042] See Figure 1 In some embodiments, the edge of the mounting plate 400 is adapted to the contoured structure, and the mounting plate 400 can abut against the contoured structure along a direction perpendicular to the reference direction. This avoids interference during the connection of the mounting plate 400 to the housing 100, thereby improving the efficiency, stability, and reliability of the mounting plate 400 installation. It also lays the foundation for ensuring that the first surface 111 and the second surface 410 are flush with each other.

[0043] See Figure 1In some embodiments, for ease of description, the direction in which the mounting plate 400 abuts against the contoured structure is referred to as the first direction, and the direction perpendicular to both the first direction and the aforementioned reference direction is referred to as the second direction. The first direction, the second direction, and the reference direction can be understood as the extension directions of three coordinate axes in a spatial rectangular coordinate system. For example, the first direction can be the X-axis extension direction, the second direction can be the Y-axis extension direction, and the reference direction can be the Z-axis extension direction. The mounting plate 400 has a first through hole 421 and a second through hole 422, such that the first through hole 421 and the second through hole 422 penetrate the mounting plate 400 along its thickness direction. Both the first through hole 421 and the second through hole 422 extend a certain length along the first direction, and the extension length of the second through hole 422 can be greater than the extension length of the first through hole 421. The first through hole 421 and the second through hole 422 are arranged along the second direction and are interconnected. Using one edge of the mounting plate 400 as a reference edge 430, which extends along the second direction and is located outside the housing 100, it is clear that the orthographic projection of the reference edge 430 along the aforementioned reference direction will also be located outside the housing 100. A first through hole 421 extends to the reference edge 430, and a second through hole 422 is spaced apart from the reference edge 430, with the end of the second through hole 422 further away from the reference edge 430 than the first through hole 421.

[0044] See Figure 1 During the process of hooking the mounting plate 400 onto the support member, the mounting plate 400 can move relative to the support member in a first direction, causing the support member to gradually enter the first through hole 421 in the first direction. When the support member enters the connection between the first through hole 421 and the second through hole 422, the mounting plate 400 can move relative to the support member in a second direction, thereby causing the support member to enter the second through hole 422. Then, the mounting plate 400 is moved relative to the support member in the first direction, so that the support member can abut against the end of the second through hole 422 near the reference edge 430 in the first direction. This achieves the hooking of the mounting plate 400 onto the support member, thereby improving the stability and reliability of the power conversion device 10 installation.

[0045] See Figure 3In some embodiments, one of the first shell 110 and the mounting plate 400 is provided with a positioning hole 440, and the other includes a protrusion 140. For example, the protrusion 140 can protrude from the contoured structure of the first shell 110, and the number of protrusions 140 can be two or three, etc. The positioning hole 440 can be provided on the mounting plate 400, and the number of positioning holes 440 can be equal to the number of protrusions 140, corresponding one-to-one. During the installation process of the mounting plate 400 and the first shell 110, the protrusions 140 can be first inserted into the positioning hole 440, thus achieving preliminary positioning of the mounting plate 400 relative to the first shell 110, thereby improving the installation efficiency and accuracy of the mounting plate 400 relative to the first shell 110.

[0046] In some embodiments, the mounting plate 400 is detachably connected to the first housing 110. For example, the mounting plate 400 and the first housing 110 can be threaded together, or they can be snap-fitted together. Because the mounting plate 400 is detachably connected to the first housing 110, the mounting plate 400 can be unloaded from the first housing 110 during the transportation or storage of the power conversion device 10, thereby reducing the space occupied by the power conversion device 10 in the first direction and improving the convenience of the power conversion device during transportation or storage.

[0047] See Figure 4 In some embodiments, the second shell 120 includes a base plate 121, a sidewall 122, and a protrusion 123. The base plate 121 may have a generally rectangular outline, and the sidewall 122 may have a generally cylindrical structure. The sidewall 122 protrudes from the base plate 121 along the aforementioned reference direction and is connected to the edge of the base plate 121, such that the sidewall 122 surrounds the base plate 121. The sidewall 122 is connected to the first shell 110, and the base plate 121 and the circuit board 200 are spaced apart along the reference direction (e.g., ...). Figure 2 The base plate 121 has an inner surface 1211, which is actually the surface in the thickness direction of the base plate 121. The inner surface 1211 defines part of the boundary of the accommodating cavity 130. Obviously, the inner surface 1211 is oriented towards the circuit board 200 and is spaced a certain distance from the circuit board 200. A protrusion 123 protrudes along a reference direction on the inner surface 1211. By providing the protrusion 123, the protrusion 123 can strengthen the structural strength of the entire second shell 120, for example, improve the impact resistance of the second shell 120, thereby improving the protection function of the entire shell 100 for the various components in the accommodating cavity 130.

[0048] See Figure 5In some embodiments, the protrusion 123 includes multiple rectangular strips 1233, which are arranged sequentially from the inside out, with the centers of all the rectangular strips 1233 overlapping each other. Similar to multiple concentric circles, the multiple rectangular strips 1233 can be understood as being concentrically arranged. This reduces the molding difficulty of each rectangular strip 1233, thereby reasonably reducing the manufacturing difficulty of the second shell 120 while ensuring structural strength, ultimately reducing the manufacturing cost of the power conversion device 10. In other embodiments, the protrusion 123 includes multiple circular strips, which are concentrically arranged.

[0049] See Figure 5 In some embodiments, the protrusion 123 further includes a first connecting strip 1231, which connects to the vertices of the rectangular strips 1233. The connecting strip can be understood as extending along the diagonal direction of the rectangular strips 1233. By providing the first connecting strip 1231, the structural strength of the second shell 120 can be improved. The protrusion 123 may also include a second connecting strip 1232. For example, the second connecting strip 1232 connects to the midpoints of the long sides of each rectangular strip 1233, such that the second connecting strip 1232 extends along the width direction of the rectangular strips 1233, i.e., the second connecting strip 1232 extends along a first direction. Alternatively, the second connecting strip 1232 connects to the midpoints of the short sides of each rectangular strip 1233, such that the second connecting strip 1232 extends along the length direction of the rectangular strips 1233, i.e., the second connecting strip 1232 extends along a second direction. Therefore, by providing the second connecting strip 1232, the structural strength of the second shell 120 can also be improved. At the same time, it can also reasonably reduce the molding difficulty of the first connecting strip 1231 and / or the second connecting strip 1232, thereby reducing the manufacturing cost of the power conversion device 10.

[0050] See Figure 2In some embodiments, the power conversion device 10 further includes a heat spreader 500 located between the base plate 121 and the circuit board 100. For example, the heat spreader 500 can be disposed on the surface of the circuit board 200 facing the base plate 121, and the heat spreader 500 is spaced apart from the base plate 121. The heat spreader 500 can have good thermal conductivity. By setting the heat spreader 500, the heat on the circuit board 500 can be evenly distributed, avoiding areas of excessively high temperature on the circuit board 200, thereby preventing damage to the circuit board 200. At the same time, the heat spreader 500 is spaced apart from the base plate 121, so there is a gap between the heat spreader 500 and the base plate 121. This gap can provide a flow channel for adhesive, which can cure the adhesive body. This facilitates the connection between the surface of the circuit board 200 and the heat spreader 500 facing the base plate 121 through the adhesive body, improving the stability and reliability of the installation of the circuit board 200 and the heat spreader 500. In other embodiments, the heat spreader 500 can abut against the protrusion 123, so the protrusion 123 can play a certain positioning role for the heat spreader 500 during installation, thereby improving the installation efficiency and accuracy of the heat spreader 500.

[0051] See Figure 1 In some embodiments, all DC connectors 320 are located on the same side of AC connectors 310. This eliminates interference, ensuring smooth connection of each wire, avoiding limitations on wiring installation space, facilitating rapid installation of the power conversion device 10, and ultimately improving the efficiency of the power conversion device 10 during installation.

[0052] See Figure 6 In some embodiments, the power conversion device 10 further includes a binding sleeve 610 and two connecting wires 620. The two connecting wires 620 are respectively connected to two interfaces of the DC connector 320. Both connecting wires 620 are fixedly connected to the binding sleeve 610, and the two connecting wires 620 pass through the binding sleeve 610. Therefore, by binding and restraining the two connecting wires 620 through the binding sleeve 610, the two connecting wires 620 can be formed into a whole through the binding sleeve 610. This facilitates the transportation and storage of the two connecting wires 620, and also facilitates the connection of the connecting wires 620 to the DC connector 320, thereby further improving the working efficiency of the power conversion device 10 during installation.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power conversion device, characterized in that, include: case; A circuit board, wherein the circuit board is disposed within the housing; An AC connector, wherein the AC connector is disposed on the housing and electrically connected to the circuit board; and A plurality of DC connectors are provided on the housing and electrically connected to the circuit board, and the AC connectors and all the DC connectors are on the same side of the housing.

2. The power conversion device according to claim 1, characterized in that, It also includes a mounting plate. The housing includes a first shell connected to the mounting plate. With the thickness direction of the housing as a reference direction, the first shell has a first surface that is furthest from the circuit board in the reference direction, and the mounting plate has a second surface that is furthest from the circuit board in the reference direction. The distance from the first surface to the circuit board is greater than or equal to the distance from the second surface to the circuit board.

3. The power conversion device according to claim 2, characterized in that, The first housing has a contoured structure that matches the shape of the electronic components disposed on the circuit board, the edge of the mounting plate is adapted to the contoured structure, and the mounting plate can abut against the contoured structure in a direction perpendicular to the reference direction.

4. The power conversion device according to claim 3, characterized in that, The direction in which the hanging plate abuts against the contoured structure is denoted as the first direction, and the direction perpendicular to both the first direction and the reference direction is denoted as the second direction. The hanging plate has a first through hole and a second through hole that are interconnected and extend along the first direction. The first through hole and the second through hole are arranged along the second direction. The hanging plate has a reference edge that extends along the second direction and is located outside the housing. The first through hole extends to the reference edge, and the second through hole is spaced apart from the reference edge. The end of the second through hole that is away from the reference edge is further away from the reference edge than the first through hole.

5. The power conversion device according to claim 2, characterized in that, One of the first shell and the hanging plate is provided with a positioning hole and the other includes a protrusion extending along the reference direction and engaging with the positioning hole.

6. The power conversion device according to claim 2, characterized in that, The mounting plate is bolted to the first shell.

7. The power conversion device according to claim 2, characterized in that, The housing further includes a second housing connected to the first housing and forming a receiving cavity, the circuit board being located in the receiving cavity, the second housing including a side wall, a bottom plate and a protrusion, the side wall surrounding the bottom plate and connected to the first housing, the bottom plate being spaced apart from the circuit board along the reference direction, and the bottom plate having an inner surface facing the circuit board, the protrusion protruding from the inner surface.

8. The power conversion device according to claim 7, characterized in that, The protrusion includes multiple rectangular strips, which are arranged sequentially from the inside out, and the centers of all the rectangular strips coincide with each other.

9. The power conversion device according to claim 8, characterized in that, It also includes at least one of the following options: The protrusion also includes a first connecting strip, which connects the vertices of the rectangular strip; The protrusion further includes a second connecting strip, which connects the midpoint of the long side of each of the rectangular strips; and / or, the second connecting strip connects the midpoint of the short side of each of the rectangular strips.

10. The power conversion device according to claim 2, characterized in that, It also includes a heat spreader plate, and the housing further includes a second housing connected to the first housing and forming a receiving cavity, the circuit board being located in the receiving cavity, the second housing including a side wall and a bottom plate, the side wall being disposed around the bottom plate and connected to the first housing, the bottom plate being spaced apart from the circuit board along the reference direction, the heat spreader plate being located between the bottom plate and the circuit board, and the heat spreader plate being spaced apart from the bottom plate.

11. The power conversion device according to claim 1, characterized in that, All of the DC connectors are located on the same side of the AC connector.

12. The power conversion device according to claim 1, characterized in that, It also includes a binding sleeve and two connecting wires, the two connecting wires being connected to the two interfaces of the DC connector respectively, and both connecting wires being fixedly connected to the binding sleeve and passing through the binding sleeve.

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