Power distribution unit and charging device

Abstract

A power distribution unit, and a charging device comprising the power distribution unit, which relate to the technical field of energy sources. The power distribution unit is configured to divide an input current into at least one path and output same. The power distribution unit comprises a mounting base, busbars and a switch matrix assembly. The busbars are fixed on the mounting base and are configured for the input or output of a current. The switch matrix assembly comprises a housing, a first circuit board, switch devices and metal sheets, wherein the housing is fixed on the mounting base and has an opening in communication with an internal space of the housing, and the opening faces the mounting base; the first circuit board is fixed in the housing; the plurality of switch devices are fixed on the first circuit board; and the metal sheets are fixed on the surface of the first circuit board facing the opening and are electrically connected to at least one of the plurality of switch devices, and one of the metal sheets and the busbars passes through the opening and is connected to the other one.

Description

Power distribution device and charging device

[0001] The present application claims priority to the Chinese patent application No. 202411345701.9, filed on September 25, 2024, and entitled "Power distribution device and charging device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy, in particular to a power distribution device and a charging device. BACKGROUND

[0003] In a charging station, the current output by a power module usually needs to be distributed to a corresponding charging interface through a power distribution device. The connection between the power module and the power distribution device, as well as the internal connection of the power distribution device, mainly relies on copper bars for switching.

[0004] In the prior art, the switching devices (e.g., relays) of the power distribution device are usually placed separately. After switching through multiple copper bars, the copper bar line becomes complex, and the number of switching paths is large, which leads to an excessively large overall size of the power distribution device and a large occupied space. In addition, the number of screw fastening points between the copper bars increases, which increases the risk of copper bar connection failure. SUMMARY

[0005] The present application provides a power distribution device and a charging device comprising the same, which can improve the integration of the power distribution device and reduce the use of copper bars and the occupation of space in the power distribution device.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a power distribution device for distributing and outputting at least one input current, comprising a mounting seat, a busbar and a switch matrix assembly. The busbar is fixed on the mounting seat and is used for inputting or outputting current. The switch matrix assembly comprises a housing, a first circuit board, switching devices and a metal sheet. The housing is fixed on the mounting seat and has an opening in communication with the internal space of the housing, the opening facing the mounting seat. The first circuit board is fixed in the housing. The switching devices are fixed on the first circuit board. The metal sheet is fixed on the board surface of the first circuit board facing the opening, the metal sheet being electrically connected to at least one of the switching devices, and one of the busbars passing through the opening and being connected to the other busbar.

[0008] The plurality of switching devices (for example, relays or contactors) are integrated on the first circuit board, and the first circuit board is installed in the shell, which improves the integration of the switching matrix assembly, facilitates the overall installation and overall replacement of the switching matrix assembly, and reduces the assembly difficulty of the power distribution device. In addition, the switching devices on the first circuit board are electrically connected by the metal sheet on the first circuit board. Since the metal sheet is arranged towards the opening of the shell, when the switching matrix assembly is installed on the mounting seat, the metal sheet can be connected with the busbar. In this way, the current input or output through the busbar can be controlled by the corresponding switching device to achieve the distribution of the current. By arranging the first circuit board and the metal sheet, the electrical connection between the busbar and the corresponding switching device is realized, and the use of copper bars and the occupation of space in the power distribution device are reduced.

[0009] In an embodiment of the present application, the shell includes a protective cover, a frame, and a fastener. The protective cover is fixedly connected with the frame through the fastener. The protective cover and the frame enclose an internal space of the shell. The first circuit board is located between the protective cover and the frame. The opening is arranged on the frame.

[0010] The shell can be arranged in a split type. For example, the shell can be divided into a protective cover and a frame, which are connected and fixed by a fastener. When the first circuit board needs to be installed in the shell, the first circuit board can be installed between the protective cover and the frame which are separated from each other, and then the protective cover and the frame are fixed by the fastener, thereby reducing the installation difficulty of the first circuit board.

[0011] In an embodiment of the present application, the switching matrix assembly further includes a fan. The shell has an air inlet and an air outlet. The fan is arranged at the air inlet.

[0012] When the first circuit board and the electronic components (for example, switching devices) thereon need to be cooled, the fan can blow air into the air inlet. The air blown by the fan flows in the shell, taking away part of the heat of the first circuit board and the electronic components thereon, or the first circuit board and the electronic components thereon exchange heat with the air blown by the fan. Finally, the air blown into the shell is discharged from the air outlet, thereby cooling the first circuit board and the electronic components thereon.

[0013] In an embodiment of the present application, the internal space of the shell includes a first air duct and a second air duct located at different sides of the first circuit board. Each switching device includes a device shell and a pin fixed on the device shell. The device shell of each switching device is located in the first air duct. The pin of each switching device extends into the second air duct through the first circuit board. The metal sheet is located in the second air duct and connected with the pin of at least one switching device. The first air duct and the second air duct are both communicated with the air inlet and the air outlet.

[0014] When the first circuit board and the electronic components thereon are cooled, the wind blows through the first air duct and the second air duct to cool both sides of the first circuit board. For example, the device shell of the switching device is arranged on one side of the first circuit board, the pins of the switching device pass through the first circuit board and are electrically connected to the corresponding metal sheet, the device shell of the switching device is cooled in the first air duct, and the connection position of the pins of the switching device and the metal sheet is cooled in the second air duct, so that the cooling of the first circuit board is more comprehensive and efficient, and the possibility that the power distribution device cannot operate normally due to excessive temperature is reduced.

[0015] In an embodiment of the present application, the first air duct includes a wind gathering channel and a conventional channel, the cross-sectional area of the wind gathering channel is smaller than that of the conventional channel, at least part of the plurality of switching devices is located in the wind gathering channel, and at least one of the air inlet and the air outlet is arranged on the wall of the shell surrounding the conventional channel.

[0016] When the wind blown by the fan enters the first air duct, it passes through the wind gathering channel. Since the cross-sectional area of the wind gathering channel is smaller, the flow rate of the wind in the wind gathering channel is faster, and the wind can quickly take away the heat in the wind gathering channel. In the present application, at least part of the plurality of switching devices is arranged in the wind gathering channel. When the wind continuously and quickly flows through the wind gathering channel, the switching devices in the wind gathering channel can be efficiently cooled, reducing the possibility that the switching devices are affected by excessive heat and cannot operate normally. In addition, since the cross-sectional area of the conventional channel is larger, the wall of the shell surrounding the conventional channel has more area to arrange larger air inlets or outlets, so that the air inlet area or the air outlet area of the shell is larger, facilitating the flow of air into or out of the shell. In addition, the conventional channel also has more space to accommodate other electronic components on the first circuit board, thereby compensating for the reduction in internal space of the shell caused by the arrangement of the wind gathering channel, so that the internal space of the shell can meet the rapid flow of air and also does not affect the arrangement and placement of electronic components in the shell.

[0017] In an embodiment of the present application, the switching matrix assembly further includes a second circuit board, the second circuit board is located in the shell and is fixed perpendicularly to the first circuit board, the part of the shell forming the air inlet is located on one side of the second circuit board in the thickness direction of the second circuit board, the plurality of switching devices is located between the second circuit board and the air inlet, and the air outlet includes a first air outlet, the first air outlet is located between the second circuit board and the air inlet.

[0018] The second circuit board can be a control board, wherein the second circuit board is fixed vertically on the first circuit board, the second circuit board and the plurality of switching devices share a height space in the shell, the length and width of the shell are reduced, and the length and width of the overall switch matrix assembly are reduced, so that the space occupancy of the switch matrix assembly is lower. In addition, when the air blown by the fan enters the shell from the air inlet, the second circuit board will block part of the flow of the air, and therefore, the first air outlet is arranged between the second circuit board and the air inlet, so that the air can be discharged from the first air outlet after being blocked by the second circuit board, thereby reducing the influence of the second circuit board on the air exhaust of the shell.

[0019] In an embodiment of the present application, the air outlet further comprises a second air outlet, the part of the shell on the side of the second circuit board away from the air inlet is an end plate of the shell, and a part of the end plate blocks the second circuit board in the direction of the thickness of the first circuit board, and another part of the end plate is provided with the second air outlet.

[0020] In the case where the first air outlet is arranged, some air still flows around the second circuit board, and therefore, the second air outlet can be arranged on the end plate of the shell, the first air outlet and the second air outlet are both air outlets for discharging air in the shell, so that the heat dissipation in the shell can be more comprehensive. In addition, the part of the end plate without the second air outlet blocks the second circuit board, and when the end plate faces upward after the shell is installed, the part of the end plate without the second air outlet can reduce the possibility of liquid from the outside falling on the second circuit board or the first circuit board, thereby better protecting the devices in the shell.

[0021] In an embodiment of the present application, the switch matrix assembly further comprises a connecting piece and a hook, the hook is fixed to the end of the fan facing the mounting seat, the hook extends into the shell through the air inlet and is hooked on the wall of the shell where the air inlet is arranged, and the end of the fan away from the mounting seat is fixed to the shell through the connecting piece.

[0022] When the fan needs to be installed, the hook of the fan can be extended into the shell and hooked on the shell, and then the fan can be fixed through the connecting piece; when the fan needs to be disassembled for maintenance, the connecting piece can be removed, and then the hooking connection between the fan and the shell can be released by simply moving. Through the arrangement of the hook and the connecting piece, the installation and disassembly steps of the fan can be simplified, and the fan can be quickly disassembled and assembled. In addition, since the connecting piece is located at the end of the fan away from the mounting seat, when the worker faces the switch matrix assembly, the worker can disassemble or assemble the connecting piece on the front of the switch matrix assembly.

[0023] In an embodiment of the present application, the power distribution device further comprises a screw, the screw passes through the shell, the first circuit board, the metal sheet and the busbar in sequence and is threadedly connected to the mounting seat, and the head of the screw abuts against the shell or the first circuit board.

[0024] The screw not only locks the connection between the switch matrix assembly and the mounting seat, but also presses the metal sheet on the first circuit board on the busbar, so that the switch matrix assembly is stably installed, and the possibility of poor contact between the metal sheet and the busbar is reduced. In addition, the head of the screw is arranged away from the mounting seat, which is beneficial to the worker to disassemble or install the screw on the front of the switch matrix assembly when the worker faces the switch matrix assembly.

[0025] In an embodiment of the present application, the shell has a through hole through which the screw passes, and the surface of the shell away from the first circuit board has a marking groove recessed toward the mounting seat, and the marking groove is in communication with the through hole.

[0026] When the screw is tightened, a marking line can be drawn on the groove bottom of the marking groove, and the drawn marking line can extend to the head of the screw, which serves as a reference. When the screw is loose, the marking line is no longer continuous, so that the worker can be reminded that the screw is abnormal, and the worker can be facilitated to maintain. In addition, the marking groove is recessed toward the mounting seat, so that the groove bottom of the marking groove is closer to the head of the screw, and the worker can be facilitated to draw a marking line on the marking groove and the head of the screw.

[0027] In an embodiment of the present application, the power distribution device further comprises a positioning column, one of the shell and the mounting seat is fixed with the positioning column, and the other comprises a positioning hole, and the positioning column is used for being inserted into the positioning hole.

[0028] When the switch matrix assembly is installed, the positioning column can be aligned with the corresponding positioning hole and inserted, and the cooperation between the positioning column and the positioning hole can not only serve as a positioning function, but also serve as a support function for the shell. For example, in the case that the positioning column protrudes in the horizontal direction, the positioning column can be regarded as a support structure, and the shell is supported by the abutting action of the positioning column and the inner wall surface of the positioning hole, so that the worker can accurately and easily connect the switch matrix assembly and the mounting seat.

[0029] In an embodiment of the present application, the positioning column or the positioning hole is located on the side wall of the shell provided with the opening.

[0030] The positioning column is hidden between the shell and the mounting seat, and the area of the mounting seat facing the shell and the side wall of the shell provided with the opening are fully utilized, so that the space occupied by the positioning column is reduced.

[0031] In a second aspect of the present application, a charging device is provided, which comprises a power conversion device, a plurality of charging interfaces, and the above-mentioned power distribution device. The busbar is electrically connected to the output end of the power conversion device and / or the input end of at least one charging interface.

[0032] The power distribution device can distribute the current from the power conversion device according to the requirements of the charging interfaces, and distribute the current output by the power conversion device to the corresponding one or more charging interfaces. The charging device provided in the present application comprises the power distribution device described above, and thus the charging device provided in the present application can solve the same technical problems and has the same technical effects as the power distribution device of the above technical solution, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a schematic diagram of the overall structure of a charging device provided in an embodiment of the present application;

[0034] FIG. 2 is a schematic diagram of the overall structure of another charging device provided in an embodiment of the present application;

[0035] FIG. 3 is a schematic diagram of the overall structure of a power distribution device provided in an embodiment of the present application;

[0036] FIG. 4 is a schematic diagram of the partial exploded structure of a power distribution device provided in an embodiment of the present application;

[0037] FIG. 5 is a schematic diagram of the overall structure of a switch matrix assembly provided in an embodiment of the present application;

[0038] FIG. 6 is a schematic diagram of the partial exploded structure of a switch matrix assembly provided in an embodiment of the present application;

[0039] FIG. 7 is a sectional view of a power distribution device provided in an embodiment of the present application;

[0040] FIG. 8 is an enlarged view of A in FIG. 7;

[0041] FIG. 9 is a schematic diagram of the structure of a marking groove provided in an embodiment of the present application;

[0042] FIG. 10 is a schematic diagram of the structure of a fan provided in an embodiment of the present application;

[0043] FIG. 11 is a schematic diagram of the structure of a second circuit board provided in an embodiment of the present application;

[0044] FIG. 12 is a schematic diagram of the structure of an air outlet provided in an embodiment of the present application;

[0045] FIG. 13 is a schematic diagram of the structure of a wind gathering channel provided in an embodiment of the present application;

[0046] FIG. 14 is a schematic diagram of the structure of another wind gathering channel provided in an embodiment of the present application;

[0047] FIG. 15 is a side view of a switch matrix assembly provided in an embodiment of the present application;

[0048] FIG. 16 is a sectional view of A-A in FIG. 15;

[0049] Fig. 17 is a sectional view at B-B in Fig. 15;

[0050] Fig. 18 is a sectional view at C-C in Fig. 15.

[0051] Reference signs: 100 - charging device; 101 - device cabinet; 102 - charging gun; 103 - charging host; 104 - charging terminal; 105 - power conversion device; 106 - power distribution device; 107 - charging interface; 108 - cable; 1 - mounting seat; 2 - busbar; 3 - switch matrix assembly; 31 - shell; 310 - opening; 311 - protective cover; 312 - frame; 313 - fastener; 314 - positioning hole; 3141 - first positioning hole; 3142 - second positioning hole; 3143 - third positioning hole; 3144 - fourth positioning hole; 315 - hanging ear; 316 - through hole; 317 - marking groove; 318 - air inlet; 319 - air outlet; 3191 - first air outlet; 3192 - second air outlet; 320 - end plate; 321 - first air duct; 3211 - wind gathering channel; 3212 - general channel; 322 - second air duct; 323 - convex part; 324 - concave part; 3241 - avoidance groove; 325 - support column; 32 - first circuit board; 33 - switching device; 331 - device shell; 332 - pin; 34 - metal sheet; 35 - fan; 351 - hook; 36 - second circuit board; 4 - screw; 5 - positioning column; 51 - first positioning column; 52 - second positioning column; 53 - third positioning column; 54 - fourth positioning column; 6 - fastening structure; 7 - connecting piece. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0053] In the present application, the terms "first", "second", etc. are only for the purpose of description and are used to distinguish one element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0054] In the present application, unless otherwise explicitly specified and limited, the meaning of "multiple" is two or more.

[0055] Further, in the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0056] In the drawings of the embodiments of the present application, the entity structures of components, assemblies, etc. are represented by guide lines; the hollow structures of openings, holes, spaces, cavities, etc. are represented by guide lines with arrows.

[0057] The charging device 100 can be a charging pile, for example, an integrated charging pile. FIG. 1 exemplarily shows a structure of a charging device 100 (an integrated charging pile). Referring to FIG. 1, the charging device 100 includes a device cabinet 101 and at least one charging gun 102 (for example, FIG. 1 shows the case of multiple charging guns 102). When the charging gun 102 is not performing a charging operation, it can be plugged on the device cabinet 101 for personnel to take at any time.

[0058] For another example, the charging device 100 can also be a split charging pile. FIG. 2 exemplarily shows a structure of another charging device 100 (a split charging pile). Referring to FIG. 2, the charging device 100 includes a charging host 103, at least one charging terminal 104, and at least one charging gun 102. For example, FIG. 2 shows the case of multiple charging terminals 104 and multiple charging guns 102. Each charging terminal 104 is electrically connected to the charging host 103, and each charging terminal 104 corresponds to one or more charging guns 102. When the charging gun 102 is not performing a charging operation, the charging gun 102 can be plugged on the corresponding charging terminal 104 for personnel to take from the charging terminal 104.

[0059] In addition, referring to FIGS. 1 and 2, the charging device 100 further includes a power conversion device 105, a power distribution device 106, and multiple charging interfaces 107. For example, in the example that the charging device 100 is an integrated charging pile, referring to FIG. 1, the power conversion device 105, the power distribution device 106, and the multiple charging interfaces 107 can be all arranged in the device cabinet 101. Each charging interface 107 can be electrically connected to the corresponding charging gun 102 through a cable 108. For another example, in the example that the charging device 100 includes the charging host 103 and at least one charging terminal 104, referring to FIG. 2, the power conversion device 105 and the power distribution device 106 can be arranged in the charging host 103, and the charging interface 107 can be arranged in the terminal cabinet of the charging terminal 104. Each charging interface 107 is electrically connected to the corresponding charging gun 102 through the cable 108.

[0060] The input of the power conversion device 105 is configured to receive AC power, and the output of the power conversion device 105 is configured to output DC power. For example, referring to FIG. 1 and FIG. 2, the power conversion device 105 can include a plurality of AC-DC modules and a plurality of DC-DC modules. The output of the power conversion device 105 is electrically connected to the input of the power distribution device 106, and the output of the power distribution device 106 is electrically connected to the input of the plurality of charging interfaces 107. The power distribution device 106 is configured to distribute the DC power output by the power conversion device 105 to at least one charging interface 107, and the output of the charging interface 107 outputs DC power, so that the device to be charged (for example, an electric vehicle) is charged through the charging gun 102. In some other examples, the power conversion device 105 can include a plurality of AC-DC modules, and no DC-DC module is provided.

[0061] It should be noted that the charging device 100 shown in FIG. 1 and FIG. 2 is only an example of the two charging devices 100 provided in the present application, and is not a limitation on the charging device 100 of the present application.

[0062] The embodiment of the present application provides a power distribution device 106. FIG. 3 exemplarily shows a structure of the power distribution device 106. The power distribution device 106 is configured to distribute the input current into at least one path and output. For example, the power distribution device 106 is configured to distribute the current input by the power conversion device 105 into one or more paths and output to the corresponding charging interface 107.

[0063] FIG. 4 exemplarily shows a partial exploded view of a power distribution device 106. Referring to FIG. 4, the power distribution device 106 includes a mounting seat 1, a busbar 2, and a switch matrix assembly 3. The busbar 2 can be a copper bar or an aluminum bar. The busbar 2 is fixed (for example, by bolt connection, riveting, bonding, etc.) on the mounting seat 1 and is configured to input or output current. For example, the busbar 2 is electrically connected to the output of the power conversion device 105 (the power conversion device 105 can refer to FIG. 1 or FIG. 2). For another example, the busbar 2 is electrically connected to the input of the corresponding one or more charging interfaces 107 (the charging interface 107 can refer to FIG. 1 or FIG. 2). For another example, the busbar 2 is electrically connected to the output of the power conversion device 105 and the input of the at least one charging interface 107. In addition, the switch matrix assembly 3 is mounted on the mounting seat 1.

[0064] The embodiment of the present application provides a switch matrix assembly 3, Fig. 5 exemplarily shows a switch matrix assembly 3, Fig. 6 exemplarily shows a partial exploded view of a switch matrix assembly 3, referring to Figs. 5 and 6, the switch matrix assembly 3 comprises a shell 31, a first circuit board 32, a metal sheet 34 and a plurality of switch devices 33 (only two switch devices 33 are exemplarily marked in Fig. 6). Wherein, the shell 31 can be any suitable housing structure, for example, the shell 31 can be an integrated housing, for another example, the shell 31 can also be a split housing (for example, the case shown in Fig. 6). The shell 31 has a space inside for installing devices or apparatuses, and the shell 31 also has an opening 310 in communication with the space inside, the size of the opening 310 can be set according to requirements, for example, the opening 310 can be a mounting port on the sidewall of the shell 31, for another example, the opening 310 can be a port on one side of the shell 31 (in this example, the shell 31 can be understood as a shroud arranged outside the mounting base 1).

[0065] The first circuit board 32 is fixed in the shell 31, for example, referring to Fig. 6, the shell 31 has a support column 325 inside for installing and fixing the first circuit board 32, for another example, the first circuit board 32 is directly fixed on the inner wall surface of the shell 31. The first circuit board 32 can be a printed circuit board (PCB), and the metal sheet 34 and the plurality of switch devices 33 are fixed on the first circuit board 32.

[0066] The metal sheet 34 can be a copper bar, a copper sheet, an aluminum bar, etc., and the metal sheet 34 can be fixed on the first circuit board 32 by pressure bonding, adhesive bonding, welding, etc. The switch device 33 can be any electronic component capable of controlling the on-off of a circuit, for example, the switch device 33 can be a relay, for another example, the switch device 33 can be a contactor. In addition, the plurality of switch devices 33 can be arranged on the first circuit board 32 in any suitable manner, for example, the plurality of switch devices 33 are arranged at intervals in the same direction (for example, the case shown in Fig. 6), for another example, the plurality of switch devices 33 are arranged in an array.

[0067] In the examples shown in Figs. 5 and 6, the metal sheet 34 and the plurality of switch devices 33 are fixed on different board surfaces of the first circuit board 32, and in some other examples, the metal sheet 34 and the plurality of switch devices 33 can also be fixed on the same board surface of the first circuit board 32. In addition, whether the metal sheet 34 and the plurality of switch devices 33 are on the same board surface or not, in order to facilitate external wiring or external busbar 2, the metal sheet 34 is fixed on the board surface of the first circuit board 32 facing the opening 310.

[0068] The metal sheet 34 is electrically connected to at least one of the plurality of switching devices 33, for example, one metal sheet 34 is electrically connected to one switching device 33, for another example, one metal sheet 34 is electrically connected to a plurality of switching devices 33, and the application does not make specific limitations in this regard. There are various ways for the metal sheet 34 to electrically connect the switching device 33. In one example provided by the application, FIG. 7 shows a cross-sectional view of a power distribution device 106, the metal sheet 34 and the plurality of switching devices 33 are fixed on different board surfaces of the first circuit board 32. Each switching device 33 includes a device shell 331 and a pin 332, the device shell 331 is provided with a contact and other structures (not shown in the figure) for breaking current, and the pin 332 is fixed on the device shell 331. The pin 332 of each switching device 33 penetrates through the first circuit board 32 and is electrically connected to the corresponding metal sheet 34.

[0069] In the case of an integrated shell of the shell 31, the first circuit board 32 can be installed in the shell 31 through the opening 310. In the case of a split shell of the shell 31, the first circuit board 32 can be installed in the shell 31 by splitting the shell 31, for example, referring to FIGS. 5 and 6, the shell 31 can include a protective cover 311, a frame 312, and fasteners 313. The protective cover 311 is covered outside the frame 312, and the opening 310 is provided on the frame 312. The protective cover 311 and the frame 312 enclose the internal space of the shell 31, and the first circuit board 32 is located between the protective cover 311 and the frame 312. The protective cover 311 and the frame 312 are fixedly connected by the fasteners 313, wherein the fasteners 313 can be screws, bolts, rivets, adhesive glue, etc. The application does not make specific limitations on the structure of the fasteners 313. FIG. 6 only shows a part of the fasteners 313, and some other fasteners 313 are hidden.

[0070] In order to facilitate disassembly and installation, at least part of the fasteners 313 can be arranged on the side of the protective cover 311 away from the frame 312, which is beneficial for the workers to remove or install the fasteners 313 from the front of the switch matrix assembly 3.

[0071] In the above example, the shell 31 is a split shell. When it is necessary to install the first circuit board 32 in the shell 31, the first circuit board 32 can be installed between the protective cover 311 and the frame 312 which are separated from each other, and then the protective cover 311 and the frame 312 are fixed by the fasteners 313, so that the installation of the first circuit board 32 can be realized, and the difficulty of installing the first circuit board 32 is reduced.

[0072] After the first circuit board 32 is installed in the shell 31, the switch matrix assembly 3 can be installed and fixed with the mounting base 1 by fixing the shell 31 with the mounting base 1. The shell 31 can be fixed on the mounting base 1 by any suitable method, for example, the shell 31 can be fixed with the mounting base 1 by bolts, screws, rivets, etc.

[0073] In some examples, referring back to FIGS. 4 and 5, the power distribution device 106 further comprises at least one positioning column 5 (a plurality of positioning columns 5 are exemplarily shown in FIGS. 4 and 5), one of the shell 31 and the mounting base 1 is fixed with the positioning column 5, and the other has a positioning hole 314, and each positioning column 5 is used to be inserted into the corresponding positioning hole 314.

[0074] When one positioning column 5 and one positioning hole 314 are provided, the positioning column 5 can be provided on the mounting base 1, and the corresponding positioning hole 314 can be provided on the shell 31; or the positioning column 5 can be provided on the shell 31, and the corresponding positioning hole 314 can be provided on the mounting base 1. Referring to FIGS. 4 and 5, when a plurality of positioning columns 5 and a plurality of positioning holes 314 are provided, the plurality of positioning columns 5 are fixed on the mounting base 1, and the plurality of positioning holes 314 are located on the shell 31. In other examples, the plurality of positioning columns 5 can be fixed on the shell 31, and the plurality of positioning holes 314 can be located on the mounting base 1. In other examples, a part of the positioning columns 5 can be fixed on the shell 31, and the corresponding positioning holes 314 can be located on the mounting base 1, and another part of the positioning columns 5 can be fixed on the mounting base 1, and the corresponding positioning holes 314 can be located on the shell 31.

[0075] When the switch matrix assembly 3 is installed, the positioning column 5 can be aligned with and inserted into the corresponding positioning hole 314, and the cooperation between the positioning column 5 and the positioning hole 314 can not only play a positioning role, but also play a role in supporting the shell 31. For example, when the switch matrix assembly 3 is installed along the vertical direction in FIGS. 4 and 5, the positioning column 5 protrudes in the horizontal direction, and the protruding positioning column 5 can be regarded as a support structure, which supports the shell 31 through the abutting action of the positioning column 5 and the inner wall surface of the positioning hole 314, facilitating the accurate and easy connection of the switch matrix assembly 3 and the mounting base 1 by the worker.

[0076] Referring to FIGS. 4 and 5, in the case where a plurality of positioning columns 5 and a plurality of positioning holes 314 are provided, one of the plurality of positioning columns 5 (a first positioning column 51) can be fixed to the top of the mounting seat 1, and the positioning hole 314 (a first positioning hole 3141) corresponding to the first positioning column 51 is located at the top of the shell 31, for example, the first positioning hole 3141 is located on the lug 315 of the shell 31 (the lug 315 is part of the shell 31, and the lug 315 can be connected to other parts of the shell 31 by bolts). Another one of the plurality of positioning columns 5 (a second positioning column 52) can be fixed to the bottom of the mounting seat 1, and the positioning hole 314 (a second positioning hole 3142) corresponding to the second positioning column 52 is located at the bottom of the shell 31. In addition, a fastening structure 6 (for example, a screw, a bolt, a rivet, etc.) is arranged on the side of the first positioning column 51 and the second positioning column 52, respectively, and the fastening structure 6 is used to fix the shell 31 to the mounting seat 1 after the positioning column 5 is inserted into the corresponding positioning hole 314. In addition, the fastening structure 6 can be arranged at a position that is convenient for workers to disassemble or install according to actual needs.

[0077] In some examples, referring to FIGS. 4 and 5, a part of the plurality of positioning holes 314 (for example, a third positioning hole 3143 and a fourth positioning hole 3144) can be located on the side wall (side wall C1) of the shell 31 where the opening 310 is provided. The positioning column 5 (a third positioning column 53) corresponding to the third positioning hole 3143 and the positioning column 5 (a fourth positioning column 54) corresponding to the fourth positioning hole 3144 are both fixed to the mounting seat 1. The part of the positioning columns 5 (the third positioning column 53 and the fourth positioning column 54) are hidden between the shell 31 and the mounting seat 1, making full use of the area of the mounting seat 1 towards the shell 31 and the side wall of the shell 31 where the opening 310 is provided, which not only plays a role in installation and positioning, but also reduces the space occupied by the positioning columns 5, and makes the product more beautiful.

[0078] In examples where the shell 31 includes the protective cover 311 and the frame 312, referring to FIG. 6, the positioning holes 314 on the side wall (side wall C1) of the shell 31 where the opening 310 is provided can be located on the frame 312, for example, the third positioning hole 3143 and the fourth positioning hole 3144 can be located on the frame 312.

[0079] It can be understood that the shell 31 and the mounting seat 1 are positioned by cooperating with the plurality of positioning columns 5 and the corresponding positioning holes 314, which can make the installation position of the shell 31 more accurate, but in some examples, the shell 31 and the mounting seat 1 can also be positioned by cooperating with only one positioning column 5 and the corresponding positioning hole 314. The positioning column 5 can be arranged at any suitable position of the shell 31, and the positioning column 5 can also be arranged at any suitable position of the mounting seat 1.

[0080] In addition, the positioning hole 314 described above can be a through hole 316 (a hole of a through type) or a blind hole (a hole of a non-through type).

[0081] After the switch matrix assembly 3 is fixed on the mounting base 1, the opening 310 of the shell 31 is arranged towards the mounting base 1, and FIG. 7 shows the state that the switch matrix assembly 3 is fixed on the mounting base 1. FIG. 8 is an enlarged view of position A in FIG. 7. Referring to FIGS. 7 and 8, the opening 310 is arranged towards the mounting base 1, that is, the metal sheet 34 on the first circuit board 32 is arranged towards the mounting base 1, and the busbar 2 is exposed on the side of the mounting base 1 towards the shell 31. After the switch matrix assembly 3 is fixed on the mounting base 1, the metal sheet 34 and one of the busbars 2 pass through the opening 310 and are connected to (fixed to each other or in contact with each other) the other. For example, in the example shown in FIGS. 7 and 8, the busbar 2 passes through the opening 310 and is connected to the metal sheet 34 in the shell 31. In other examples, the metal sheet 34 can also pass through the opening 310 and extend out of the shell 31 and be connected to the busbar 2 outside the shell 31.

[0082] For example, the power conversion device 105 includes a plurality of power modules, the busbar 2 (a) is electrically connected to the output end of one of the power modules (a) of the power conversion device 105, and the busbar 2 (a) is also electrically connected to the input end of the charging interface 107 (a) corresponding to the power module (a). The current output by the power module (a) can be directly delivered to the corresponding charging interface 107 (a) through the busbar 2 (a). When other charging interfaces 107 (b) need to call the current of the power module (a), the current of the power module (a) can be delivered to the metal sheet 34 corresponding to the busbar 2 (a) through the busbar 2 (a), then flow through the switch device 33 electrically connected to the metal sheet 34, and then be distributed to other busbars 2 (b) through the switch device 33, and the busbar 2 (b) is electrically connected to the charging interface 107 (b). In this way, the current of the power module (a) is distributed to the charging interface 107 (b).

[0083] In other examples, the output end of the power conversion device 105 is connected to a plurality of busbars 8 (c), the input end of each charging interface 107 is connected to a busbar 8 (d), the plurality of busbars 8 (c) are respectively connected to corresponding metal sheets 34, the plurality of busbars 8 (d) are respectively connected to corresponding metal sheets 34, and the metal sheets 34 connected by the plurality of busbars 8 (c) are different from the metal sheets 34 connected by any busbar 8 (d). That is, the plurality of busbars 8 (c) connected to the output end of the power conversion device 105 are not directly connected or in contact with any busbar 8 (d) connected to the input end of any charging interface 107. In this way, the current output from the power conversion device 105 needs to pass through the power distribution device 106 before being delivered to the specified charging interface 107.

[0084] The plurality of switching devices 33 are integrated on the first circuit board 32, and the first circuit board 32 is installed in the shell 31, which improves the integration of the switching matrix assembly 3, facilitates the overall installation and overall replacement of the switching matrix assembly 3, and reduces the assembly difficulty of the power distribution device 106. In addition, the switching devices 33 on the first circuit board 32 are electrically connected by the metal sheet 34 on the first circuit board 32. Since the metal sheet 34 is arranged towards the opening 310 of the shell 31, when the switching matrix assembly 3 is installed in the mounting seat 1, the metal sheet 34 can be connected with the busbar 2. In this way, the current input or output through the busbar 2 can be controlled by the corresponding switching device 33 to realize the distribution of the current by the power distribution device 106. By arranging the first circuit board 32 and the metal sheet 34, the electrical connection between the busbar 2 and the corresponding switching device 33 is realized, and the use of copper bars in the switching matrix assembly 3 and the occupation of space are reduced.

[0085] In some examples, referring to FIG. 8, the power distribution device 106 further includes a screw 4, which can be a screw top, a bolt, etc. The screw 4 passes through the shell 31, the first circuit board 32, the metal sheet 34 and the busbar 2 in sequence, and is threadedly connected with the mounting seat 1. In the example shown in FIG. 8, the shell 31 has a through hole 316 with a diameter larger than that of the head of the screw 4. The head of the screw 4 is located in the through hole 316, and abuts against the first circuit board 32. In other examples, the diameter of the through hole 316 is smaller than that of the head of the screw 4. In such examples, the head of the screw 4 can also abut against the shell 31.

[0086] In some examples, a plurality of screws 4, metal sheets 34 and busbars 2 can be provided. The plurality of screws 4 pass through the shell 31 and the first circuit board 32, and each screw 4 passes through a corresponding metal sheet 34 and a corresponding busbar 2 and is threadedly connected with the mounting seat 1. In other examples, a plurality of screws 4, metal sheets 34 and busbars 2 can be provided. The plurality of screws 4 pass through the shell 31 and the first circuit board 32, but only one or a part of the screws 4 pass through the corresponding metal sheet 34 and the corresponding busbar 2 and are threadedly connected with the mounting seat 1.

[0087] The screw 4 not only locks the connection between the switching matrix assembly 3 and the mounting seat 1, but also presses the metal sheet 34 on the first circuit board 32 against the busbar 2, so that the switching matrix assembly 3 is stably installed, and the possibility of poor contact between the metal sheet 34 and the busbar 2 is reduced. In addition, the head of the screw 4 is arranged away from the mounting seat 1, which is beneficial for the worker to remove or install the screw 4 from the front of the switching matrix assembly 3 when facing the switching matrix assembly 3.

[0088] In addition, in some examples, the surface of the shell 31 has a marking groove 317. FIG. 9 shows an example structure of the marking groove 317. Referring to FIGS. 8 and 9, the marking groove 317 is located on the surface of the shell 31 facing away from the first circuit board 32, and the marking groove 317 is recessed towards the mounting base 1. It can be understood that the groove bottom surface (surface C2) of the marking groove 317 is lower than the surface (surface C3) of the shell 31 on which the marking groove 317 is arranged, or in other words, the groove bottom surface of the marking groove 317 is closer to the mounting base 1. The marking groove 317 is in communication with the through hole 316. For example, FIG. 9 shows an example in which the shell 31 has a plurality of through holes 316, and in this example, a plurality of marking grooves 317 can also be provided, each through hole 316 being in communication with a marking groove 317. In other examples, one marking groove 317 can be in communication with a plurality of through holes 316.

[0089] The marking groove 317 is recessed towards the mounting base 1, so that the groove bottom surface of the marking groove 317 is closer to the head of the screw 4. When the screw 4 is tightened, a marking line can be drawn on the groove bottom surface of the marking groove 317, and the drawn marking line can extend to the head of the screw 4, thereby serving as a reference. When the screw 4 is loosened, the marking line is no longer continuous, thereby reminding the worker that the screw 4 is in an abnormal state, facilitating the worker to judge the state of the screw 4, and being conducive to timely maintenance.

[0090] Referring to FIG. 9, in some examples, the switch matrix assembly 3 further includes a fan 35, and the shell 31 has an air inlet 318 and an air outlet 319, and the fan 35 is arranged at the air inlet 318. The fan 35 blows air into the air inlet 318, and the air blown by the fan 35 flows in the shell 31, thereby taking away part of the heat of the first circuit board 32 and the electronic components (e.g., the switching device 33) thereon, or in other words, the first circuit board 32 and the electronic components thereon exchange heat with the air blown by the fan 35. Finally, the air blown into the shell 31 is discharged from the air outlet 319, thereby achieving heat dissipation of the first circuit board 32 and the electronic components thereon.

[0091] The fan 35 can be mounted on the shell 31 in any suitable manner. The fan 35 can be arranged inside the shell 31, or the fan 35 can be arranged outside the shell 31, or the fan 35 can be partially arranged inside the shell 31 and partially arranged outside the shell 31.

[0092] Fig. 10 shows the fan 35 being removed from the housing 31, and arrow 1 in Fig. 10 indicates the position of the mounting seat 1. Referring to Figs. 9 and 10, the switch matrix assembly 3 further comprises a hook 351 fixed (e.g., integrally connected) to the end of the fan 35 facing the mounting seat 1. The hook 351 extends into the housing 31 through the air inlet 318 and hooks onto the wall (wall C4) of the housing 31 where the air inlet 318 is provided. The end of the fan 35 away from the mounting seat 1 is fixed to the housing 31, for example, the switch matrix assembly 3 further comprises a connecting member 7, which can be a screw, a bolt, a pin, etc. The end of the fan 35 away from the mounting seat 1 is fixed to the housing 31 through the connecting member 7.

[0093] With the above design, when the fan 35 needs to be installed, the hook 351 of the fan 35 can be extended into the housing 31 and hooked onto the housing 31, and then the fan 35 can be fixed through the connecting member 7. When the fan 35 needs to be removed for maintenance, the connecting member 7 can be removed, and then the hooking connection between the fan 35 and the housing 31 can be released by simply moving. With the hook 351 and the connecting member 7, the installation and removal steps of the fan 35 can be simplified, and the fan 35 can be quickly installed and removed. In addition, since the connecting member 7 is located at the end of the fan 35 away from the mounting seat 1, when a worker faces the switch matrix assembly 3, the worker can conveniently remove or install the connecting member 7 from the front of the switch matrix assembly 3.

[0094] The air inlet 318 and the air outlet 319 can be provided at any suitable position, for example, the air inlet 318 is provided at the bottom of the housing 31, and the air outlet 319 is provided at the top of the housing 31. The plurality of switch devices 33 are located between the air inlet 318 and the air outlet 319, so that the plurality of switch devices 33 can be sufficiently cooled.

[0095] In some examples, the switch matrix assembly 3 further comprises a second circuit board 36. Fig. 11 (cross-sectional view) shows a structure of the second circuit board 36. The second circuit board 36 can be a control board, and the second circuit board 36 is fixed perpendicularly to the first circuit board 32. The above-mentioned "perpendicular" is not limited to an absolute perpendicular intersection (an angle of 90°), and a relationship that is not an absolute perpendicular intersection due to factors such as assembly tolerance, design tolerance, and structure flatness is allowed. That is, a certain range of errors, for example, an assembly error range of an angle of 70° to 110°, can be understood as a perpendicular relationship. By fixing the second circuit board 36 perpendicularly to the first circuit board 32, the second circuit board 36 and the plurality of switch devices 33 share the height space in the housing 31, which reduces the length and width of the housing 31, and thus reduces the length and width of the switch matrix assembly 3 as a whole, so that the space occupancy rate of the switch matrix assembly 3 is lower.

[0096] The second circuit board 36 can be disposed on one side of the first circuit board 32 (as shown in FIG. 11), or can be disposed on one end of the first circuit board 32 and extend towards both sides in the thickness direction of the first circuit board 32.

[0097] In the case where the second circuit board 36 is disposed on the first circuit board 32, the air inlet 318 is located on one side of the second circuit board 36 in the thickness direction thereof (for example, the air inlet 318 is located below the board surface of the second circuit board 36), and the plurality of switching devices 33 are located between the second circuit board 36 and the air inlet 318. FIG. 12 schematically shows a structure of an air outlet 319, wherein the air outlet 319 comprises a first air outlet 3191 located between the second circuit board 36 and the air inlet 318. When the air blown by the fan 35 enters from the air inlet 318, the second circuit board 36 will block part of the air flow, and therefore, by disposing the first air outlet 3191 between the second circuit board 36 and the air inlet 318, the air can be discharged from the first air outlet 3191 after being blocked by the second circuit board 36, thereby reducing the possibility that the second circuit board 36 hinders the air in the housing 31 from being discharged outside. The first air outlet 3191 can comprise a plurality of air holes for ventilation.

[0098] Regarding the position of the first air outlet 3191, in some examples, referring to FIG. 12, the air inlet 318 and the air outlet 319 are distributed along a first direction (the first direction is also the thickness direction of the second circuit board 36 in FIG. 12), the housing 31 and the mounting base 1 are distributed along a second direction (the second direction is also the thickness direction of the first circuit board 32 in FIG. 12), the first direction is perpendicular to the second direction, and the housing 31 is provided with the first air outlet 3191 on both side walls (side wall C5) distributed in a third direction, and the first direction and the second direction are both perpendicular to the third direction. In other examples, the first air outlet 3191 can also be disposed on the wall of the housing 31 facing away from the first circuit board 32, which is not limited in the present application.

[0099] In addition, referring to FIG. 11, the air outlet 319 can further comprise a second air outlet 3192, the part of the housing 31 located on the side of the second circuit board 36 facing away from the air inlet 318 is an end plate 320 of the housing 31, a part (C6 area) of the end plate 320 blocks the second circuit board 36, and another part of the end plate 320 is provided with the second air outlet 3192. For example, in the examples shown in FIG. 11 and FIG. 12, the second circuit board 36 is fixed on the board surface of the first circuit board 32 facing the switching devices 33, the part (C6 area) of the end plate 320 located on the side of the first circuit board 32 facing the second circuit board 36 blocks the second circuit board 36, and the part of the end plate 320 located on the side of the first circuit board 32 facing away from the second circuit board 36 is provided with the second air outlet 3192. The second air outlet 3192 can comprise a plurality of air holes for ventilation.

[0100] In the case where the first air outlet 3191 is provided, some air will still flow around the second circuit board 36, and therefore a second air outlet 3192 can be provided on the end plate 320 of the housing 31. The first air outlet 3191 and the second air outlet 3192 are both part of the air outlet 319, and are configured to allow air in the housing 31 to be discharged. This allows heat to be dissipated more comprehensively in the housing 31.

[0101] The part of the end plate 320 that does not have the second air outlet 3192 (the C6 region) blocks the second circuit board 36. When the housing 31 is installed with the end plate 320 facing upwards, the part of the end plate 320 that does not have the second air outlet 3192 can reduce the likelihood of liquid from the outside falling onto the second circuit board 36 or the first circuit board 32, thereby providing better protection for the devices in the housing 31. It should be noted that the part of the end plate 320 that blocks the second circuit board 36 does not have the second air outlet 3192, but if required by the design, other hole structures can be provided in this part, such as a cable hole for the cable 108, and the present application does not limit the design in this regard.

[0102] In addition, in some examples, the air outlet 319 can further include a third air outlet located on the side of the second circuit board 36 that faces away from the air inlet 318, and close to the second air outlet 3192. The air outlet 319 can further include a fourth air outlet and a fifth air outlet provided at other positions of the housing 31.

[0103] After the air blown by the fan 35 enters the housing 31 from the air inlet 318, the air enters different air channels in the housing 31. For example, referring to FIG. 11, the internal space of the housing 31 includes a first air channel 321 and a second air channel 322 located on different sides of the first circuit board 32. The device housing 331 of each switch device 33 is located in the first air channel 321, and the pin 332 of each switch device 33 extends through the first circuit board 32 into the second air channel 322. The metal sheet 34 is located in the second air channel 322 and is connected to the pin 332 of the corresponding switch device 33. The first air channel 321 and the second air channel 322 are both in communication with the air inlet 318 and the air outlet 319. When the fan 35 is in operation, the air blown by the fan 35 enters the first air channel 321 and the second air channel 322 through the air inlet 318, thereby dissipating heat on both sides of the first circuit board 32. For example, the device housing 331 of the switch device 33 is provided on one side of the first circuit board 32, the pin 332 of the switch device 33 extends through the first circuit board 32 and is electrically connected to the metal sheet 34, the device housing 331 of the switch device 33 dissipates heat in the first air channel 321, and the connection position of the pin 332 of the switch device 33 and the metal sheet 34 dissipates heat in the second air channel 322, thereby allowing the first circuit board 32 to dissipate heat more comprehensively and efficiently, and reducing the likelihood that the power distribution device 106 cannot operate normally due to excessive temperature.

[0104] The structure of the first air duct 321 can be changed as needed. For example, referring to FIG. 12, in some examples, the first air duct 321 includes a wind gathering channel 3211 and a regular channel 3212 that are in communication, the cross-sectional area of the wind gathering channel 3211 is smaller than that of the regular channel 3212, at least part (all or part) of the plurality of switching devices 33 is located in the wind gathering channel 3211, and at least one of the air inlet 318 and the air outlet 319 is arranged on the wall of the shell 31 that surrounds the regular channel 3212. In the example shown in FIG. 12, two regular channels 3212 are provided, the wind gathering channel 3211 is located between the two regular channels 3212, the air inlet 318 is arranged on the wall of the shell 31 that surrounds one of the regular channels 3212, and the air outlet 319 is arranged on the wall of the shell 31 that surrounds the other regular channel 3212.

[0105] The wind gathering channel 3211 can also have various forms. For example, FIG. 13 schematically shows a structure of a wind gathering channel 3211, which can be understood as a simplification of the structure in FIG. 12. Referring to FIGS. 12 and 13, both of the two side walls (two side walls C5) of the shell 31 in the third direction have a convex portion 323 and a concave portion 324, the concave portion 324 is closer to the plurality of switching devices 33 (dashed box in FIG. 13) in the third direction than the convex portion 323, and the wind gathering channel 3211 is located between the two concave portions 324.

[0106] In some examples, referring to FIG. 12, to avoid the screw 4, the concave portion 324 can also be provided with a plurality of avoiding grooves 3241, so as to further reduce the space size of the wind gathering channel 3211.

[0107] FIG. 14 schematically shows another structure of a wind gathering channel 3211. Referring to FIG. 14, the wind gathering channel 3211 and the regular channel 3212 are each provided with one, both of the two side walls (two side walls C5) of the shell 31 in the third direction have a convex portion 323 and a concave portion 324, the concave portion 324 is closer to the plurality of switching devices 33 (dashed box in FIG. 14) in the third direction than the convex portion 323, and the wind gathering channel 3211 is located between the two concave portions 324. In this example, the air inlet 318 can be arranged on the wall of the shell 31 that surrounds the wind gathering channel 3211, and the air outlet 319 can be arranged on the wall of the shell 31 that surrounds the regular channel 3212.

[0108] In other examples, one of the two side walls (two side walls C5) of the shell 31 in the third direction has a convex portion 323 and a concave portion 324, and the other side wall does not have a concave structure.

[0109] By setting the wind gathering channel 3211, the flow rate of the wind can be increased. When the wind blown by the fan 35 enters the first air duct 321, it will pass through the wind gathering channel 3211. Since the cross-sectional area of the wind gathering channel 3211 is smaller, the flow rate of the wind is faster, and the wind can quickly take away the heat in the wind gathering channel 3211. By setting at least part of the plurality of switching devices 33 in the wind gathering channel 3211, when the wind continuously and quickly flows through the wind gathering channel 3211, the switching devices 33 in the wind gathering channel 3211 can be efficiently cooled, reducing the possibility that the switching devices 33 will be overheated and affect their normal operation.

[0110] In addition, since the cross-sectional area of the conventional channel 3212 is larger, the wall of the housing 31 surrounding the conventional channel 3212 has more area to set a larger area of the air inlet 318 or the air outlet 319, so that the air inlet area or the air outlet area of the housing 31 is larger, facilitating the air to enter the housing 31 and the air in the housing 31 to be discharged. In addition, the conventional channel 3212 also has more space for setting other electronic components located on the first circuit board 32, which makes up for the defect of the reduction of the internal space of the housing 31 caused by the setting of the wind gathering channel 3211, so that the internal space of the housing 31 can meet the fast flow of the wind and does not affect the arrangement and placement of the electronic components in the housing 31.

[0111] Regarding the judgment of the size of the cross-sectional area of the wind gathering channel 3211 and the cross-sectional area of the conventional channel 3212, the cross-section of the wind gathering channel 3211 and the cross-section of the conventional channel 3212 need to be parallel to each other, and the cross-section of the wind gathering channel 3211 and the cross-section of the conventional channel 3212 are both parallel to the thickness direction of the first circuit board 32, and the cross-section of the wind gathering channel 3211 and the cross-section of the conventional channel 3212 are both perpendicular to the distribution direction of the wind gathering channel 3211 and the conventional channel 3212. In the example of setting the second circuit board 36, the cross-section of the wind gathering channel 3211 and the cross-section of the conventional channel 3212 are both perpendicular to the thickness direction of the second circuit board 36.

[0112] For example, FIG. 15 shows a side view of a switch matrix assembly 3, FIG. 16 is a cross-sectional view of A-A in FIG. 15, the grid shaded part (M1) in FIG. 16 is the cross-section of one of the conventional channels 3212, FIG. 17 is a cross-sectional view of B-B in FIG. 15, the grid shaded part (M2) in FIG. 17 is the cross-section of the wind gathering channel 3211, and FIG. 18 is a cross-sectional view of C-C in FIG. 15, the grid shaded part (M3) in FIG. 18 is the cross-section of another conventional channel 3212. By comparing FIG. 16 and FIG. 17, and comparing FIG. 17 and FIG. 18, it can be more intuitively concluded that the cross-sectional area of the two conventional channels 3212 is larger than the cross-sectional area of the wind gathering channel 3211.

[0113] Due to the production and processing of the shell 31, the cross-sectional area of the wind gathering channel 3211 at different positions can not be equal, in which case, when compared with the cross-sectional area of the regular channel 3212, the maximum value of the cross-sectional area of the wind gathering channel 3211 can be taken. When the cross-sectional area of the regular channel 3212 at different positions is not equal, when compared with the cross-sectional area of the wind gathering channel 3211, the minimum value of the cross-sectional area of the regular channel 3212 can be taken.

[0114] In other examples, the shell 31 can also be a cover outside the mounting base 1, and the first circuit board 32 can be fixed on the mounting base 1 first, and then the shell 31 is installed, that is, after the first circuit board 32 is fixed with the mounting base 1, the shell 31 is covered outside the first circuit board 32. The application does not specifically limit the installation sequence of the shell 31, the first circuit board 32 and the like.

[0115] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power distribution device for distributing an input current into at least one path and outputting, characterized by, The power distribution device comprises a mounting seat, busbars fixed on the mounting seat for current input or output, and a switch matrix assembly comprising: a housing fixed on the mounting seat, the housing having an opening in communication with an internal space thereof, the opening facing the mounting seat; a first circuit board fixed in the housing; a plurality of switch devices for controlling on-off, the plurality of switch devices being fixed on the first circuit board; a metal sheet fixed on a board surface of the first circuit board facing the opening, the metal sheet being electrically connected to at least one of the plurality of switch devices, the metal sheet passing through the opening and being connected to one of the busbars.

2. The power distribution apparatus of claim 1, wherein, The housing comprises a shield, a frame and fasteners, the shield being fixedly connected with the frame by the fasteners, the shield and the frame enclosing the internal space of the housing, the first circuit board being located between the shield and the frame, and the opening being provided on the frame.

3. The power distribution apparatus of claim 1, wherein, The switch matrix assembly further comprises a fan, the housing having an air inlet and an air outlet, and the fan being provided at the air inlet.

4. The power distribution apparatus of claim 3, wherein, The internal space of the housing comprises a first air duct and a second air duct located at different sides of the first circuit board, each of the switch devices comprises a device shell and a pin fixed on the device shell, the device shell of each of the switch devices being located in the first air duct, the pin of each of the switch devices extending into the second air duct through the first circuit board, the metal sheet being located in the second air duct and connected to the pin of at least one of the switch devices, and the first air duct and the second air duct being in communication with the air inlet and the air outlet.

5. The power distribution apparatus of claim 4, wherein, The first air duct comprises a wind collecting channel and a regular channel in communication, a cross-sectional area of the wind collecting channel being smaller than that of the regular channel, at least part of the plurality of switch devices being located in the wind collecting channel, and at least one of the air inlet and the air outlet being provided on a wall of the housing enclosing the regular channel.

6. The power distribution apparatus of claim 3, wherein, The switch matrix assembly further comprises a second circuit board fixed perpendicularly on the first circuit board, a portion of the housing forming the air inlet being located on one side of the second circuit board in a thickness direction thereof, the plurality of switch devices being located between the second circuit board and the air inlet, and the air outlet comprising a first air outlet located between the second circuit board and the air inlet.

7. The power distribution apparatus of claim 6, wherein, The air outlet further comprises a second air outlet, a portion of the housing located on a side of the second circuit board away from the air inlet being an end plate of the housing, a portion of the end plate shielding the second circuit board in the thickness direction of the first circuit board, and another portion of the end plate providing the second air outlet.

8. The power distribution apparatus of claim 3, wherein, The switch matrix assembly further comprises a connecting piece and a hook, the hook is fixed at the end of the fan facing the mounting base, the hook extends into the shell through the air inlet, and is hooked on the wall of the shell provided with the air inlet, and the end of the fan away from the mounting base is fixed with the shell through the connecting piece.

9. The power distribution apparatus of claim 1, wherein, The power distribution device further comprises a screw, the screw passes through the shell, the first circuit board, the metal sheet and the busbar in sequence and is threadedly connected with the mounting base, and the head of the screw abuts against the shell or the first circuit board.

10. The power distribution apparatus of claim 9, wherein, The shell has a through hole through which the screw passes, and a marking groove is formed on the surface of the shell away from the first circuit board, the marking groove is recessed toward the mounting base, and the marking groove is communicated with the through hole.

11. The power distribution apparatus of any one of claims 1-10, wherein, The power distribution device further comprises a positioning column, one of the shell and the mounting base is fixed with the positioning column, and the other comprises a positioning hole, and the positioning column is used for being inserted into the positioning hole.

12. The power distribution apparatus of claim 11, wherein, The positioning column or the positioning hole is located on the side wall of the shell provided with the opening.

13. A charging device, characterized by The power distribution device comprises a power conversion device, a plurality of charging interfaces, and the power distribution device of any one of claims 1-12, and the busbar is electrically connected with the output end of the power conversion device and / or the input end of at least one of the charging interfaces.

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