Power conversion device and charging apparatus

Abstract

This application provides a power conversion device and a charging device, relating to the field of charging equipment technology. The power conversion device includes multiple power devices, a first housing, a second housing, a first circuit board, and a second circuit board; a portion of the multiple power devices is fixed to the first circuit board, and another portion is fixed to the second circuit board. The first housing has a first boss on its side facing the second housing, and the first boss has a first through hole communicating with the internal space of the first housing; the second housing has a second boss on its side facing the first housing, and the second boss has a second through hole communicating with the internal space of the second housing; the first boss and the second boss are sealed together, and the first through hole and the second through hole are connected. The device also includes a conductive element passing through the first through hole and the second through hole, one end of which is electrically connected to the first circuit board, and the other end of which is electrically connected to the second circuit board. This power conversion device reduces the use of through-wall sealing structures, simplifies assembly, and reduces costs.

Description

Technical Field

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

[0002] As the core equipment for replenishing electric vehicle power, the power density and structural design of charging piles directly affect charging efficiency and operational reliability. With the rapid development of fast charging technology, the overall power of charging piles continues to increase. Traditional single-power boards, due to space constraints in component layout, can no longer meet the requirements for heat dissipation, electromagnetic compatibility, and electrical insulation in high-power scenarios. To address this, the industry is gradually shifting to a dual-power board architecture (the power module of the charging pile adopts a dual-cavity design, with each cavity integrating an independent power board) to alleviate the problem of insufficient single-board area. This architecture can both expand power capacity and optimize heat dissipation and suppress electromagnetic interference through cavity layout.

[0003] In dual-power board architectures, the power connection across cavities needs to be considered. Current solutions involve routing the power signals from both cavities to the outside via through-wall sealing components (such as through-wall sealing terminals or connectors), and then interconnecting them via external copper busbars or cables. However, this method requires a large number of through-wall sealing components, resulting in high costs and complex connection procedures. Utility Model Content

[0004] This application provides a power conversion device and a charging device that can reduce the use of through-wall sealing structures, simplify power connection methods, facilitate assembly, and reduce costs.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] On one hand, this application provides a power conversion device, which includes a plurality of power devices, a first housing and a second housing fixedly connected, a first circuit board located within the first housing, and a second circuit board located within the second housing; a portion of the plurality of power devices is located within the first housing and fixed to the first circuit board, and another portion of the plurality of power devices is located within the second housing and fixed to the second circuit board. The side of the first housing facing the second housing has a first boss protruding into the second housing, the first boss having a first through hole extending along the arrangement direction of the first and second housings, the first through hole communicating with the internal space of the first housing; the side of the second housing facing the first housing has a second boss protruding into the first housing, the second boss having a second through hole extending along the arrangement direction of the first and second housings, the second through hole communicating with the internal space of the second housing; the first boss and the second boss are sealed together, and the first through hole and the second through hole are connected. The power conversion device also includes a conductive element passing through the first through hole and the second through hole, one end of the conductive element being electrically connected to the first circuit board, and the other end being electrically connected to the second circuit board.

[0007] In the power conversion device disclosed in this application, a first protrusion is provided on the side of the first housing facing the second housing, and a second protrusion is provided on the side of the second housing facing the first housing, with the first and second protrusions sealed together. This allows one end of the conductive element to be electrically connected to the first circuit board located inside the first housing, and the other end of the conductive element to be electrically connected to the second circuit board located inside the second housing after passing through the first and second through holes. Since the various parts of the conductive element are respectively located within the internal space of the first housing, the first through hole, the second through hole, and the internal space of the second housing, sealing the first and second protrusions together is sufficient to meet the sealing requirements for power connection across cavities, without needing to consider the sealing performance of the conductive element itself. Compared to solutions that use through-wall sealing structures to lead electrical signals from the first and second housings to the outside of their respective housings, the electrical connection in this application can be completed using ordinary conductive elements without the need for through-wall sealing structures with sealing functions, thus reducing the cost of power connection. In addition, through-wall sealing structures are generally complex in structure because they require both sealing and electrical connection functions. During assembly, both electrical connection and sealing factors need to be taken into account. The design of this application can avoid or improve this problem. Compared with power connection through through-wall sealing structures, it can simplify the power connection method and facilitate assembly.

[0008] In one embodiment of this application, a portion of the first boss is inserted into the second through hole, and a seal is provided between the first boss and the second boss.

[0009] This application simplifies assembly by enabling the first and second bosses to be quickly positioned and relatively fixed through a plug-in connection. The sealing element between the first and second bosses fills the plug-in gap, forming a physical isolation layer that effectively prevents external contaminants from entering the first and second through holes through the gap. The plug-in connection between the first and second bosses, along with the sealing element, achieves both convenient and stable mechanical connection, while also enhancing the reliability of the power conversion device through sealing protection.

[0010] In one embodiment of this application, the inner wall of the second boss has a protruding structure that protrudes toward the second through hole. The side of the protruding structure facing away from the second boss bends toward the first boss, and the second boss and the protruding structure form a first annular groove. The sealing element includes a first sealing ring, which is located in the first annular groove. The end of the first boss facing the second housing extends into the first annular groove and contacts the first sealing ring.

[0011] The second boss and the raised structure of this application form a first annular groove, so that the first boss can be inserted into the first annular groove. The first annular groove facilitates the quick insertion and positioning of the first boss. In addition, by providing a first sealing ring in the first annular groove, when the end of the first boss facing the second housing extends into the first annular groove, the first boss can act on the first sealing ring, so that one side of the first sealing ring contacts the first boss, and the other side of the first sealing ring contacts the raised structure on the inner wall of the second boss, thereby achieving a sealed connection between the first boss and the second boss.

[0012] In one embodiment of this application, the portion of the first boss inserted into the second boss has a second annular groove, the second annular groove being recessed from the outer wall of the first boss in a direction away from the second boss. The seal also includes a second sealing ring, at least a portion of which is located within the second annular groove, and the side of the second sealing ring facing the second boss contacts the inner wall of the second boss.

[0013] With the above-described configuration, the second annular groove can be used to accommodate at least a portion of the second sealing ring, so that when the first boss is inserted into the second through hole of the second boss, a sealed connection can be achieved between the outer wall of the first boss and the inner wall of the second boss.

[0014] In one embodiment of this application, the outer wall of the first boss has a first guide surface in the shape of an annular shape; the radial dimension of the first guide surface gradually decreases along the direction from the first housing to the second housing.

[0015] This application design causes the radial dimension of the first guide surface to gradually decrease along the direction from the first housing to the second housing. This results in a smaller radial dimension at the end of the first boss facing the second housing compared to the end facing away from the second housing, and a larger radial dimension at the end facing away from the second housing compared to the end facing towards the second housing. This arrangement of the first guide surface facilitates the insertion of the first boss into the second through-hole of the second boss. Furthermore, because the radial dimension of the end of the first boss facing away from the second housing is larger than that of the end facing towards the second housing when the first boss is inserted into the second through-hole, the gradually increasing radial dimension of the first boss also reduces the gap between the first and second bosses, improving their sealing performance.

[0016] In one embodiment of this application, the inner wall of the second boss has an annular second guide surface; the radial dimension of the second guide surface gradually decreases along the direction from the first housing to the second housing.

[0017] Similar to the first guide surface, the second guide surface facilitates the insertion of the first boss into the second through hole of the second boss. Furthermore, when the first boss is inserted into the second through hole of the second boss, the radial dimension of the end of the second boss facing away from the first housing is larger than that of the end facing the first housing. Therefore, the gradually increasing radial dimension of the second boss reduces the gap between the first and second bosses, improving their sealing performance.

[0018] In one embodiment of this application, the power conversion device further includes a first connecting terminal and a first screw connector located within a first housing; a portion of the first connecting terminal is fixedly connected to a first circuit board, the head of the first screw connector contacts one end of a conductive element, and the shank of the first screw connector passes through the conductive element and is fixed to the first connecting terminal. The power conversion device also includes a second connecting terminal and a second screw connector located within a second housing; a portion of the second connecting terminal is fixedly connected to a second circuit board, the head of the second screw connector contacts the other end of the conductive element, and the shank of the second screw connector passes through the conductive element and is fixed to the second connecting terminal.

[0019] This application provides a first connecting terminal and a first screw connector. The first connecting terminal is fixedly connected to a first circuit board, and the first screw connector secures the end of the first connecting terminal and the conductive element away from the second circuit board. Furthermore, by providing a second connecting terminal and a second screw connector, the second connecting terminal is fixedly connected to the second circuit board, and the second screw connector secures the end of the second connecting terminal and the conductive element away from the first circuit board. In this way, electrical signals from the first circuit board can be conducted to the conductive element through the first connecting terminal, and electrical signals from the second circuit board can be conducted to the conductive element through the second connecting terminal, thereby achieving electrical signal interconnection between the first and second circuit boards. In other words, this application provides a specific method for achieving electrical connection between the first and second circuit boards, and this electrical connection method is simple and easy to implement.

[0020] In one embodiment of this application, the power conversion device further includes a first fixing member and a second fixing member. The first fixing member is located inside a first housing and is fixed to the side of the first connecting terminal opposite to the conductive member. The shank of the first screw-in member passes through the conductive member and the first connecting terminal and is threadedly connected to the first fixing member. The second fixing member is located inside a second housing and is fixed to the side of the second connecting terminal opposite to the conductive member. The shank of the second screw-in member passes through the conductive member and the second connecting terminal and is threadedly connected to the second fixing member.

[0021] This application, by providing a first fixing member and a second fixing member, increases the dimension along the arrangement direction of the first fixing member and the first connecting terminal. When the conductive component, the first connecting terminal, and the first fixing member are fixed by the first screw connector, the structural strength of the connection point of the first screw connector is improved, thus enhancing the connection reliability. Similarly, the second fixing member increases the dimension along the arrangement direction of the second fixing member and the second connecting terminal. When the conductive component, the second connecting terminal, and the second fixing member are fixed by the second screw connector, the structural strength of the connection point of the second screw connector is improved, thus enhancing the connection reliability.

[0022] In one embodiment of this application, the first connection terminal is located on the side of the first circuit board facing the second housing, and the second connection terminal is located on the side of the second circuit board facing the first housing.

[0023] By employing the aforementioned configuration, this application ensures that the distance between the first connecting terminal and the second connecting terminal, along the arrangement direction of the first and second housings, is less than the distance between the first circuit board and the second circuit board. This allows for a reduction in the size of the conductive component when electrically connecting the first and second connecting terminals via a conductive element. This saves material costs and improves cost-effectiveness; furthermore, shortening the wiring reduces electrical signal loss and enhances the electrical performance reliability of the power conversion device.

[0024] In one embodiment of this application, the conductive component includes a third connecting terminal, a fourth connecting terminal, and a first cable fixed between the third connecting terminal and the fourth connecting terminal. The third connecting terminal is located within a first housing, and one end of the third connecting terminal facing away from the first cable is fixed between the head of a first screw and the first connecting terminal. The fourth connecting terminal is located within a second housing, and one end of the fourth connecting terminal facing away from the first cable is fixed between the head of a second screw and the second connecting terminal.

[0025] The conductive component of this application, employing this structural form, enables power connection between the first and second circuit boards, and the connection method is simple. Furthermore, both the third and fourth connection terminals can utilize common conductive terminal structures (such as OT terminals), making the components readily available and reducing the cost of power connection.

[0026] In one embodiment of this application, the conductive element is a copper busbar.

[0027] The conductive component of this application, using this structural form, can also achieve power connection between the first circuit board and the second circuit board. Since the conductive component in this structural form only includes copper busbars, that is, the number of components is small, which can help reduce the cost of the power conversion device; and can reduce the complexity of power connection, improve power connection efficiency and connection reliability.

[0028] In one embodiment of this application, the conductive component includes a third connecting terminal, a fourth connecting terminal, a first connector, a second connector, a second cable, and a third cable; a portion of the second cable and the third connecting terminal are located within a first housing, and another portion of the second cable and the first connector are located within a first through hole; a portion of the third cable and the fourth connecting terminal are located within a second housing, and another portion of the third cable and the second connector are located within a second through hole. One end of the third connecting terminal is fixed between the head of the first screw and the first connecting terminal, the other end of the third connecting terminal is connected to one end of the second cable, the other end of the second cable is connected to one end of the first connector, the other end of the first connector is inserted into one end of the second connector, the other end of the second connector is connected to one end of the third cable, the other end of the third cable is connected to one end of the fourth connecting terminal, and the other end of the fourth connecting terminal is fixed between the head of the second screw and the second connecting terminal.

[0029] The conductive component of this application, employing this structural form, can also achieve power connection between the first circuit board and the second circuit board. Specifically, by placing a portion of the second cable and the third connecting terminal within the first housing, and the other portion of the second cable and the first connector within the first through hole, the third connecting terminal, the second cable, and the first connector can be assembled simultaneously when installing components within the first housing. Similarly, by placing a portion of the third cable and the fourth connecting terminal within the second housing, and the other portion of the third cable and the second connector within the second through hole, the fourth connecting terminal, the third cable, and the second connector can be assembled simultaneously when installing components within the second housing. Thus, during the assembly of the first and second housings, power connection between the first circuit board within the first housing and the second circuit board within the second housing can be achieved simply by inserting the first connector and the second connector together, making the power connection method between the first and second circuit boards simpler and more convenient to assemble.

[0030] In one embodiment of this application, the power conversion device further includes a plurality of fins, a portion of which is fixed to the wall of the second housing facing the first housing, and another portion of which is fixed to the wall of the second housing facing the first housing.

[0031] This application increases the heat dissipation area of ​​the first and second housings by providing multiple fins between the first and second housings, thereby facilitating the dissipation of heat generated by the power devices in the first and second housings and improving the heat dissipation effect of the power conversion device.

[0032] On the other hand, this application provides a charging device, including a charging gun and a power conversion device in any of the above embodiments, wherein the output terminal of the power conversion device is electrically connected to the charging gun.

[0033] The charging device provided in this application includes the power conversion device in any of the above embodiments. Therefore, the charging gun can at least reduce the use of through-wall sealing structures when realizing power connection, simplify the power connection method, facilitate assembly, and reduce costs. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the charging device provided in the embodiments of this application;

[0035] Figure 2 This is a schematic diagram of the power conversion device provided in the embodiments of this application;

[0036] Figure 3 One of the cross-sectional views of the power conversion device provided in the embodiments of this application;

[0037] Figure 4 for Figure 3A magnified view of a section at point A1;

[0038] Figure 5 for Figure 3 A magnified view of a section at point B1;

[0039] Figure 6 This is a schematic diagram of the structure of the first and second housings provided in the embodiments of this application;

[0040] Figure 7 for Figure 6 A magnified view of a section at point C;

[0041] Figure 8 A second cross-sectional view of the power conversion device provided in the embodiments of this application;

[0042] Figure 9 for Figure 8 A magnified view of a section at point A2 in the middle;

[0043] Figure 10 for Figure 8 A magnified view of a section at point B2;

[0044] Figure 11 Third cross-sectional view of the power conversion device provided in the embodiments of this application;

[0045] Figure 12 for Figure 11 A magnified view of a section at point A3;

[0046] Figure 13 for Figure 11 A magnified view of a section at point B3;

[0047] Figure 14 for Figure 11 A magnified view of a section at point D.

[0048] Figure label:

[0049] 01 - Charging equipment; 100 - Power conversion device; 200 - Charging gun;

[0050] 10-Power devices;

[0051] 21-First housing; 211-First boss; 2111-First through hole; 2112-First guide surface; 22-Second housing; 221-Second boss; 2211-Second through hole; 2212-Second guide surface; 2213-Protrusion structure;

[0052] 31-First circuit board; 32-Second circuit board;

[0053] 40 - Conductive component; 41 - Third connector terminal; 42 - Fourth connector terminal; 43 - First cable; 44 - Copper busbar; 45 - First connector; 46 - Second connector; 47 - Second cable; 48 - Third cable;

[0054] 50 - Seal; 51 - First sealing ring; 52 - Second sealing ring;

[0055] 61 - First connecting terminal; 62 - Second connecting terminal;

[0056] 71-First screw connector; 72-Second screw connector;

[0057] 81-First fastener; 82-Second fastener;

[0058] 90-fin. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "one" or similar terms do not indicate a quantity limitation, but rather indicate the existence of at least one.

[0061] In the embodiments of this application, the terms "example" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "example" or "for example" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0062] Figure 1 This is one of the structural schematic diagrams of the charging device 01 provided in the embodiments of this application. Please refer to... Figure 1 As shown in the figure, this application embodiment provides a charging device 01, which is used to charge electric vehicles or other devices that need to be charged.

[0063] Please refer to Figure 1The charging device 01 includes a charging gun 200 and a power conversion device 100, the output terminal of which is electrically connected to the charging gun 200. The power conversion device 100 integrates multiple power devices and is used to convert the input electrical energy into power before outputting it. For example, the power conversion device 100 can convert input direct current (DC) into alternating current (AC); or, it can convert input AC into DC; or, it can boost or buck voltage; or, it can simultaneously perform multiple functions.

[0064] The power conversion device 100 includes power devices, which are crucial for realizing power conversion and control and have significant current and voltage withstand capabilities. For example, power devices include insulated-gate bipolar transistors, metal-oxide-semiconductor field-effect transistors, or diodes, etc. This application does not impose any special limitations on the specific type of power device. Additionally, for example, in addition to integrating power devices, the power conversion device 100 also includes circuit boards and other electronic components, such as capacitors, resistors, and inductors.

[0065] In some embodiments, the power conversion device 100 of the charging device 01 includes an alternating current-to-direct current (AC-DC) module. The AC-DC module is electrically connected to at least one charging gun 200 and is used to convert alternating current into direct current and output it to the at least one charging gun 200. The at least one charging gun 200 is used to provide direct current to electric vehicles or other electric devices for charging them.

[0066] In some embodiments, the power conversion device 100 of the charging device 01 includes an AC-DC module and a DC-DC module. The AC-DC module is electrically connected to the input terminal of the DC-DC module via a DC bus, and the output terminal of the DC-DC module is electrically connected to at least one charging gun 200. The AC-DC module converts alternating current (AC) into direct current (DC) and outputs it to the DC bus. The DC-DC module performs power conversion on the DC power obtained from the DC bus and outputs it to at least one charging gun 200. The at least one charging gun 200 provides the converted DC power to electric vehicles or other electric equipment for charging them.

[0067] For example, the charging device 01 is mounted on a column or wall, or fixed to a column or wall in other ways. This application does not limit the specific installation method of the charging device 01. Figure 1 This is just one illustration of the installation method for charging device 01.

[0068] When the charging device 01 is mounted on a column or wall, for example, a mounting bracket (also called a mounting backplate) is installed on the column or wall, and a hook is fixed to one side of the charging device 01. The charging device 01 is mounted on the mounting bracket through the hook. This application does not limit the structural form of the mounting bracket and the hook, as long as it ensures that the charging device 01 is stably installed on the column or wall. For example, the hook can be a hook, and the mounting bracket can be a support plate that can be attached to the hook. This application uses a mounting method to fix the charging device 01 to the column or wall, which facilitates the installation and removal of the charging device 01, saving time and effort.

[0069] Of course, using a hanging method to fix the charging device 01 is only one example. In some embodiments, the charging device 01 can also be directly fixed to the column or wall using screws or other means.

[0070] In addition, fixing the charging device 01 to a column or wall is only one example of an installation method. In some embodiments, the charging device 01 may also be configured to be fixed to other components or equipment.

[0071] As the overall power of the charging device 01 increases, in some embodiments, the power conversion device 100 of the charging device 01 adopts a dual-cavity design (i.e., each cavity integrates an independent power board) to alleviate the problem of insufficient single-board area. This architecture can both expand power capacity and optimize heat dissipation and suppress electromagnetic interference through cavity layout. However, the power connection problem across cavities needs to be considered in the dual-power board architecture. The solution in some embodiments is to lead the power signals in both cavities to the outside of their respective cavities through through-wall sealing structures (such as through-wall sealing terminals or through-wall sealing connectors), and then achieve power interconnection through external copper busbars or cables. However, this connection method requires the use of a large number of through-wall sealing structures, which is costly and complex. To this end, this application proposes a power conversion device 100 that can reduce the use of through-wall sealing structures, simplify the power connection method, facilitate assembly, and reduce costs.

[0072] The specific structure of the power conversion device 100 provided in this application will be described in detail below.

[0073] Figure 2 This is a schematic diagram of the power conversion device 100 provided in the embodiments of this application. Figure 3 This is one of the cross-sectional views of the power conversion device 100 provided in the embodiments of this application. Please refer to the reference. Figure 2 and Figure 3The power conversion device 100 includes a plurality of power devices 10, a first housing 21 and a second housing 22 fixedly connected, a first circuit board 31 located within the first housing 21, and a second circuit board 32 located within the second housing 22. A portion of the plurality of power devices 10 is located within the first housing 21 and fixed to the first circuit board 31, and another portion of the plurality of power devices 10 is located within the second housing 22 and fixed to the second circuit board 32.

[0074] This application employs a two-shell configuration (i.e., a first shell 21 and a second shell 22). This allows for the separate placement of corresponding circuit boards and some power devices 10 within each shell. On one hand, this improves the integration of the power conversion device 100, thus enhancing its power density. On the other hand, by using two shells, during assembly of the power conversion device 100, the first shell 21 and its internal components, as well as the second shell 22 and its internal components, are assembled separately before being connected, ensuring electrical connection between the components in the first shell 21 and the components in the second shell 22. This method enables modularity of the power conversion device 100, facilitating assembly and subsequent maintenance.

[0075] The first housing 21 and the second housing 22 are fixedly connected. The method of fixing the first housing 21 and the second housing 22 is not limited in this application. For example, the first housing 21 and the second housing 22 are welded; or the first housing 21 and the second housing 22 are snapped together; or the first housing 21 and the second housing 22 are fixed by screws.

[0076] This application includes multiple power devices 10, a portion of which is fixed to a first circuit board 31 and another portion to a second circuit board 32. The power devices 10 on the first circuit board 31 and the power devices 10 on the second circuit board 32 are electrically connected to form a power conversion circuit. This power conversion circuit is used to convert input electrical energy into power and output it. For example, it is used to convert input direct current into alternating current; or, it is used to convert input alternating current into direct current; or, it is used for voltage boosting or bucking.

[0077] Figure 6 This is a schematic diagram of the structure of the first housing 21 and the second housing 22 provided in the embodiments of this application. Figure 7 for Figure 6 Please refer to the enlarged view of section C in the middle. Figure 3 , Figure 6 and Figure 7As shown, in some embodiments, the side of the first housing 21 facing the second housing 22 has a first boss 211 protruding towards the second housing 22. The first boss 211 has a first through hole 2111 extending along the arrangement direction of the first housing 21 and the second housing 22. The first through hole 2111 communicates with the internal space of the first housing 21.

[0078] That is, the first housing 21 has a first boss 211, which protrudes from the side of the first housing 21 facing the second housing 22, and a first through hole 2111 is provided in the first boss 2111. The first through hole 2111 passes through the first boss 2111 along the arrangement direction of the first housing 21 and the second housing 22, and one end of the first through hole 2111 communicates with the internal space of the first housing 21, while the other end faces the second housing 22.

[0079] In some examples, the side of the second housing 22 facing the first housing 21 has a second boss 221 that protrudes toward the first housing 21. The second boss 221 has a second through hole 2211 that extends along the arrangement direction of the first housing 21 and the second housing 22. The second through hole 2211 communicates with the internal space of the second housing 22. The first boss 211 and the second boss 221 are sealed together, and the first through hole 2111 and the second through hole 2211 are connected.

[0080] That is, the second housing 22 has a second boss 221, which protrudes from the side of the second housing 22 facing the first housing 21, and a second through hole 2211 is provided in the second boss 221. The second through hole 2211 passes through the second boss 221 along the arrangement direction of the first housing 21 and the second housing 22, and one end of the second through hole 2211 communicates with the internal space of the second housing 22, while the other end faces the first housing 21 and communicates with the first through hole 2111.

[0081] In addition, the first boss 211 and the second boss 221 of this application are sealed together. After the first boss 211 and the second boss 221 are sealed together, the first through hole 2111 and the second through hole 2211 are connected, and the first through hole 2111, the second through hole 2211, the internal space of the first housing 21 and the internal space of the second housing 22 together form a relatively sealed inner cavity.

[0082] For example, the sealing connection between the first boss 211 and the second boss 221 can be achieved by welding the first boss 211 and the second boss 221 together, that is, the end of the first boss 211 facing the second boss 221 is welded together with the end of the second boss 221 facing the first boss 211; or, the sealing connection between the first boss 211 and the second boss 221 can also be achieved by a sealing member 50, that is, a sealing member 50 is provided between the first boss 211 and the second boss 221, and the sealing connection between the first boss 211 and the second boss 221 is achieved by the sealing member 50.

[0083] The power conversion device 100 of this application also includes a conductive element 40 passing through the first through hole 2111 and the second through hole 2211. One end of the conductive element 40 is electrically connected to the first circuit board 31, and the other end is electrically connected to the second circuit board 32.

[0084] The electrical connection between the conductive element 40 and the first circuit board 31 can be direct or indirect; similarly, the electrical connection between the conductive element 40 and the second circuit board 32 can also be direct or indirect. That is, this application does not limit the specific connection method of the electrical connection between the opposite ends of the conductive element 40 and the first circuit board 31 and the second circuit board 32, respectively.

[0085] In the power conversion device 100 provided in this application, a first boss 211 is provided on the side of the first housing 21 facing the second housing 22, and a second boss 221 is provided on the side of the second housing 22 facing the first housing 21, and the first boss 211 and the second boss 221 are sealed together. In this way, when one end of the conductive member 40 is electrically connected to the first circuit board 31 located in the first housing 21, and the other end of the conductive member 40 passes through the first through hole 2111 and the second through hole 2211 and is electrically connected to the second circuit board 32 located in the second housing 22, since the various parts of the conductive member 40 are respectively located in the internal space of the first housing 21, the first through hole 2111, the second through hole 2211 and the internal space of the second housing 22, it is only necessary to seal the first boss 211 and the second boss 221 together to meet the sealing requirements during power connection across the cavity, without having to consider the sealing performance of the conductive member 40 itself. Compared to the scheme of using a through-wall sealing structure to lead the electrical signals in the first housing 21 and the second housing 22 to the outside of the corresponding housings, the electrical connection of this application can be completed using a common conductive component 40, without the need for a through-wall sealing structure with sealing function, thus reducing the cost of power connection.

[0086] In addition, through-wall sealing structures are generally complex in structure because they require both sealing and electrical connection functions. During assembly, both electrical connection and sealing factors need to be taken into account. The design of this application can avoid or improve this problem. Compared with power connection through through-wall sealing structures, it can simplify the power connection method and improve assembly efficiency.

[0087] In addition, one end of the conductive component 40 of this application is electrically connected to the first circuit board 31, and the other end passes through the internal space of the first housing 21, the first through hole 2111 and the second through hole 2211 in sequence and extends into the internal space of the second housing 22, and is electrically connected to the second circuit board 32 inside the second housing 22. This method is equivalent to realizing a straight-through power connection in the hollow channel between the first housing 21 and the second housing 22 (the hollow channel is composed of the internal space of the first housing 21, the first through hole 2111, the second through hole 2211 and the internal space of the second housing 22). The power connection method is simple and does not require the use of through-wall sealing structure. It is only necessary to seal the first boss 211 and the second boss 221 to seal the first through hole 2111 and the second through hole 2211.

[0088] Please continue to refer to Figure 7 In one embodiment of this application, a portion of the first boss 211 is inserted into the second through hole 2211, and a sealing member 50 is provided between the first boss 211 and the second boss 221.

[0089] That is, the first boss 211 and the second boss 221 are inserted into each other, and a sealing connection is achieved between the first boss 211 and the second boss 221 through the sealing member 50. This application simplifies the assembly process by enabling the first boss 211 and the second boss 221 to be quickly positioned and relatively fixed through the insertion. The sealing member 50 between the first boss 211 and the second boss 221 fills the insertion gap, forming a physical isolation layer that effectively prevents external contaminants from entering the first through hole 2111 and the second through hole 2211 through the gap between the first boss 211 and the second boss 221. The insertion of the first boss 211 and the second boss 221, and the sealing connection achieved through the sealing member 50, not only achieves convenient and stable mechanical connection but also improves the reliability of the power conversion device 100 through sealing protection.

[0090] Of course, the above-mentioned first boss 211 being inserted into the second through hole 2211 is only an example. In other embodiments, a portion of the second boss 221 is inserted into the first through hole 2111. That is, the first boss 211 may be inserted into the second through hole 2211 of the second boss 221; or the second boss 221 may be inserted into the first through hole 2111 of the first boss 211.

[0091] The following describes two structural forms of the seal 50 by way of example. The seal 50 may adopt either of the two structural forms described below, or the seal 50 may adopt both of the two structural forms described below simultaneously.

[0092] (1) One structural form of the seal 50: Please refer to Figure 7 The inner wall of the second boss 221 has a protruding structure 2213 that protrudes towards the second through hole 2211. The side of the protruding structure 2213 facing away from the second boss 221 bends towards the first boss 211. The second boss 221 and the protruding structure 2213 form a first annular groove. The seal 50 includes a first sealing ring 51, which is located in the first annular groove. The end of the first boss 211 facing the second housing 22 extends into the first annular groove and contacts the first sealing ring 51.

[0093] That is, the seal 50 includes a first sealing ring 51, which is located between the side of the protrusion 2213 facing the first housing 21 and the side of the first boss 211 facing the second housing 22.

[0094] The aforementioned protrusion structure 2213 and the second boss 221 can be independent components (when they are independent components, the protrusion structure 2213 is fixedly connected to the inner wall of the second boss 221, and the fixing method between the inner wall of the second boss 221 and the protrusion structure 2213 can be adhesive or screw connection), or they can be integrally formed structural parts.

[0095] The second boss 221 and the protrusion structure 2213 of this application form a first annular groove, so that the first boss 211 can be inserted into the first annular groove. The first annular groove facilitates the quick insertion and positioning of the first boss 211.

[0096] This application provides a first sealing ring 51 in the first annular groove. When the end of the first boss 211 facing the second housing 22 extends into the first annular groove, the first boss 211 can act on the first sealing ring 51. One side of the first sealing ring 51 contacts the first boss 211, and the other side of the first sealing ring 51 contacts the protruding structure 2213 on the inner wall of the second boss 221, thereby achieving a sealed connection between the first boss 211 and the second boss 221.

[0097] (2) Another structural form of seal 50: Please refer to Figure 7 The portion of the first boss 211 inserted into the second boss 221 has a second annular groove, which is recessed from the outer wall of the first boss 211 toward the direction away from the second boss 221. The seal 50 also includes a second sealing ring 52, at least a portion of which is located within the second annular groove, and the side of the second sealing ring 52 facing the second boss 221 contacts the inner wall of the second boss 221.

[0098] That is, the seal 50 includes a second sealing ring 52, which is located between the outer wall of the first boss 211 and the inner wall of the second boss 221.

[0099] Furthermore, a second annular groove is provided in the portion of the first boss 211 that is inserted into the second boss 221, and the second annular groove is recessed from the outer wall of the first boss 211 in a direction away from the second boss 221. That is, a second annular groove is provided on the outer wall of the first boss 211, and the second annular groove is located in the portion of the first boss 211 inserted into the second boss 221. The provision of the second annular groove can be used to accommodate at least a portion of the second sealing ring 52, so that when the first boss 211 is inserted into the second through hole 2211 of the second boss 221, a sealing connection can be achieved between the outer wall of the first boss 211 and the inner wall of the second boss 221.

[0100] To facilitate the quick connection of the first boss 211 and the second boss 221, in one embodiment of this application, as follows: Figure 7 As shown, the outer wall of the first boss 211 has a first guide surface 2112 in the shape of an annular shape; the radial dimension of the first guide surface 2112 gradually decreases along the direction from the first housing 21 toward the second housing 22.

[0101] The first guide surface 2112 is located at the end of the first boss 211 facing the second housing 22.

[0102] Along the direction from the first housing 21 towards the second housing 22, the radial dimension of the first guide surface 2112 gradually decreases. Thus, the radial dimension of the end of the first boss 211 facing the second housing 22 is smaller than the radial dimension of the end of the first boss 211 facing away from the second housing 22, and the radial dimension of the end of the first boss 211 facing away from the second housing 22 is larger than the radial dimension of the end of the first boss 211 facing the second housing 22. Therefore, when the first boss 211 is inserted into the second through hole 2211 of the second boss 221, the first guide surface 2112 facilitates the insertion of the first boss 211. In addition, when the first boss 211 is inserted into the second through hole 2211 of the second boss 221, since the radial dimension of the end of the first boss 211 facing away from the second housing 22 is larger than that of the end of the first boss 211 facing the second housing 22, the gradually increasing radial dimension of the first boss 211 can also reduce the gap between the first boss 211 and the second boss 221, and improve the sealing performance of the first boss 211 and the second boss 221.

[0103] In addition to providing an annular first guide surface 2112 on the outer wall of the first boss 211, this application also includes other embodiments, such as... Figure 7 As shown, the inner wall of the second boss 221 has a second guide surface 2212 in the shape of an annular shape; the radial dimension of the second guide surface 2212 gradually decreases along the direction from the first housing 21 toward the second housing 22.

[0104] Along the direction from the first housing 21 towards the second housing 22, the radial dimension of the second guide surface 2212 gradually decreases. Thus, the radial dimension of the end of the second boss 221 facing the first housing 21 is smaller than the radial dimension of the end of the second boss 221 facing away from the first housing 21, and the radial dimension of the end of the second boss 221 facing away from the first housing 21 is larger than the radial dimension of the end of the second boss 221 facing the first housing 21. That is, similar to the first guide surface 2112, this arrangement facilitates the insertion of the first boss 211 into the second through hole 2211 of the second boss 221. In addition, when the first boss 211 is inserted into the second through hole 2211 of the second boss 221, since the radial dimension of the end of the second boss 221 facing away from the first housing 21 is larger than that of the end of the second boss 221 facing the first housing 21, the gradually increasing radial dimension of the second boss 221 can reduce the gap between the first boss 211 and the second boss 221 and improve the sealing performance of the first boss 211 and the second boss 221.

[0105] For example, this application may only set the first guide surface 2112, or only set the second guide surface 2212, or set both the first guide surface 2112 and the second guide surface 2212.

[0106] One end of the conductive element 40 in this application is electrically connected to the first circuit board 31, and the other end of the conductive element 40 is electrically connected to the second circuit board 32. The electrical connection between the conductive element 40 and the first circuit board 31 can be a direct electrical connection (e.g., soldering the first circuit board 31 and the conductive element 40 together) or an indirect electrical connection. When the conductive element 40 is indirectly electrically connected to both the first circuit board 31 and the second circuit board 32, the specific electrical connection structure will be described below by way of example.

[0107] (1) The structural form of the electrical connection between the conductive component 40 and the first circuit board 31: Figure 4 for Figure 3 Please refer to the enlarged view of section A1 in the middle. Figure 3 and Figure 4 In one embodiment of this application, the power conversion device 100 of this application further includes a first connection terminal 61 located in the first housing 21 and a first screw connector 71 located in the first housing 21; a portion of the first connection terminal 61 is fixedly connected to the first circuit board 31, the head of the first screw connector 71 contacts one end of the conductive member 40, and the rod of the first screw connector 71 passes through the conductive member 40 and is fixed to the first connection terminal 61.

[0108] For example, the first circuit board 31 and the first connecting terminal 61 are fixed together by soldering. For instance, the first connecting terminal 61 is a saddle terminal, and the pins of the saddle terminal extend into the through holes of the first circuit board 31 and are soldered to the first circuit board 31.

[0109] One end of the conductive member 40 is located on one side of the first connecting terminal 61, and the head of the first screw connector 71 contacts the side of the conductive member 40 facing away from the first connecting terminal 61. The shank of the first screw connector 71 passes through the conductive member 40 and is fixed to the first connector. For example, the shank of the first screw connector 71 is welded to or threaded to the first connector.

[0110] This application provides a first connecting terminal 61 and a first screw connector 71. The first connecting terminal 61 is fixedly connected to the first circuit board 31, and the first screw connector 71 fixes one end of the first connecting terminal 61 and the conductive element 40. In this way, the electrical signals of the first circuit board 31 can be conducted to the conductive element 40 through the first connecting terminal 61, thereby realizing electrical signal interconnection. That is, this application provides a specific method for realizing the electrical connection between the first circuit board 31 and the conductive element 40, and this electrical connection method is simple and easy to implement.

[0111] For example, the power conversion device 100 also includes a first fixing member 81 located inside the first housing 21 and fixed to the side of the first connecting terminal 61 facing away from the conductive member 40; the rod of the first screw member 71 passes through the conductive member 40 and the first connecting terminal 61 and is threadedly connected to the first fixing member 81.

[0112] The first fixing member 81 is fixed to the side of the first connecting terminal 61 facing away from the conductive member 40. For example, the first fixing member 81 is welded to the first connecting terminal 61.

[0113] Alternatively, the first fixing member 81 may be a nut; or, the first fixing member 81 may be a component with an internal threaded hole; or, the first fixing member 81 may be a solid structure (the first screw connector 71 is screwed into the first fixing member 81 to achieve the fixing of the first screw connector 71 and the first fixing member 81).

[0114] That is, the first screw connector 71 passes through the conductive member 40 and the first connecting terminal 61 in sequence and is then threadedly connected to the first fixing member 81. By providing the first fixing member 81, this application can increase the size along the arrangement direction of the first fixing member 81 and the first connecting terminal 61, thereby improving the structural strength of the connection point of the first screw connector 71 and improving the connection reliability when the conductive member 40, the first connecting terminal 61 and the first fixing member 81 are fixed by the first screw connector 71.

[0115] (2) The structural form of the electrical connection between the conductive component 40 and the second circuit board 32: Figure 5 for Figure 3Please refer to the enlarged view of section B1 in the middle. Figure 3 and Figure 5 The power conversion device 100 also includes a second connection terminal 62 and a second screw 72 located inside the second housing 22; a portion of the second connection terminal 62 is fixedly connected to the second circuit board 32, the head of the second screw 72 contacts the other end of the conductive member 40, and the rod of the second screw 72 passes through the conductive member 40 and is fixed to the second connection terminal 62.

[0116] For example, the second circuit board 32 is fixed to the second connecting terminal 62 by soldering. For instance, the second connecting terminal 62 is a saddle terminal, and the pins of the saddle terminal extend into the through holes of the second circuit board 32 and are soldered to the second circuit board 32.

[0117] One end of the conductive element 40 away from the first circuit board 31 is located on one side of the second connecting terminal 62, and the head of the second screw 72 contacts the side of the conductive element 40 opposite to the second connecting terminal 62. The shank of the second screw 72 passes through the conductive element 40 and is fixed to the second connector. For example, the shank of the second screw 72 is welded or threaded to the second connector.

[0118] This application provides a second connecting terminal 62 and a second screw connector 72. The second connecting terminal 62 is fixedly connected to the second circuit board 32, and the second screw connector 72 fixes the second connecting terminal 62 and the end of the conductive element 40 away from the first circuit board 31. In this way, the electrical signals of the second circuit board 32 can be conducted to the conductive element 40 through the second connecting terminal 62, thereby realizing electrical signal interconnection. That is, this application provides a specific method for realizing the electrical connection between the second circuit board 32 and the conductive element 40, and this electrical connection method is simple and easy to implement.

[0119] For example, the power conversion device 100 also includes a second fixing member 82, which is located inside the second housing 22 and is fixed to the side of the second connecting terminal 62 opposite to the conductive member 40; the rod of the second screw member 72 passes through the conductive member 40 and the second connecting terminal 62 and is threadedly connected to the second fixing member 82.

[0120] The second fixing member 82 is fixed to the side of the second connecting terminal 62 opposite to the conductive member 40. For example, the second fixing member 82 is welded to the first connecting terminal 61.

[0121] Alternatively, the second fastener 82 may be a nut; or, the second fastener 82 may be a component with an internal threaded hole; or, the second fastener 82 may be a solid structure (the second screw connector 72 is screwed into the second fastener 82 to achieve the fixation of the second screw connector 72 and the second fastener 82).

[0122] That is, the second screw connector 72 passes through the conductive member 40 and the second connecting terminal 62 in sequence and is threadedly connected to the second fixing member 82. By providing the second fixing member 82, this application can increase the size along the arrangement direction of the second fixing member 82 and the second connecting terminal 62, thereby improving the structural strength of the connection point of the second screw connector 72 and improving the connection reliability when fixing the conductive member 40, the second connecting terminal 62 and the second fixing member 82 by the second screw connector 72.

[0123] When the conductive component 40 is electrically connected to the first circuit board 31 and the second circuit board 32 respectively using the above-described connection method (that is, when the conductive component 40 is electrically connected to the first circuit board 31 and the second circuit board 32 respectively through the first connecting terminal 61 and the first screw 71, and the second connecting terminal 62 and the second screw 72), in one embodiment of the present application, the first connecting terminal 61 is located on the side of the first circuit board 31 facing the second housing 22, and the second connecting terminal 62 is located on the side of the second circuit board 32 facing the first housing 21.

[0124] The first connecting terminal 61 is located on the side of the first circuit board 31 facing the second housing 22, and the second connecting terminal 62 is located on the side of the second circuit board 32 facing the first housing 21. Thus, along the arrangement direction of the first housing 21 and the second housing 22, the distance between the first connecting terminal 61 and the second connecting terminal 62 is less than the distance between the first circuit board 31 and the second circuit board 32. Therefore, when electrically connecting the first connecting terminal 61 and the second connecting terminal 62 through the conductive member 40, it is advantageous to shorten the size of the conductive member 40. This saves material costs and improves cost-effectiveness; furthermore, shortening the circuit reduces electrical signal loss and improves the electrical performance reliability of the power conversion device 100.

[0125] The previous section introduced the electrical connection methods of the conductive component 40 with the first circuit board 31 and the second circuit board 32 respectively. The following section will illustrate several feasible specific structures of the conductive component 40.

[0126] (1) The first structural form of conductive component 40: in conjunction with reference Figures 3 to 5 As shown, the conductive component 40 includes a third connecting terminal 41, a fourth connecting terminal 42, and a first cable 43 fixed between the third connecting terminal 41 and the fourth connecting terminal 42. The third connecting terminal 41 is located within the first housing 21, and one end of the third connecting terminal 41 facing away from the first cable 43 is fixed between the head of the first screw connector 71 and the first connecting terminal 61. The fourth connecting terminal 42 is located within the second housing 22, and one end of the fourth connecting terminal 42 facing away from the first cable 43 is fixed between the head of the second screw connector 72 and the second connecting terminal 62.

[0127] That is, one end of the third connecting terminal 41 is connected to one end of the first cable 43, and the other end of the third connecting terminal 41 is located between the head of the first screw connector 71 and the first connecting terminal 61. One end of the fourth connecting terminal 42 is connected to the other end of the first cable 43, and the other end of the fourth connecting terminal 42 is located between the head of the second screw connector 72 and the second connecting terminal 62. In this way, the electrical signals of the first circuit board 31 can be transmitted to the second circuit board 32 in sequence through the first connecting terminal 61, the third connecting terminal 41, the first cable 43, the fourth connecting terminal 42, and the second connecting terminal 62, thereby realizing the electrical signal interconnection between the first circuit board 31 and the second circuit board 32.

[0128] For example, the third connecting terminal 41 and the fourth connecting terminal 42 are OT terminals. OT terminals, also known as circular cold-pressed terminals, are widely used in electrical connections. They are named for their circular head and cylindrical tail, giving them an overall "OT" shape. The circular head of the OT terminal is located between the corresponding screw (first screw 71 or second screw 72) and the corresponding connecting terminal (first connecting terminal 61 or second connecting terminal 62). The cylindrical tail of the OT terminal is used to secure the first cable 43; for example, one end of the first cable 43 is crimped into the cylindrical tail of the OT terminal.

[0129] When the length direction of the first cable 43 is perpendicular to the surfaces of the first circuit board 31 and the second circuit board 32, the third connecting terminal 41 is bent to facilitate connection between the first cable 43 and the first circuit board 31 via the third connecting terminal 41. For example, when the third connecting terminal 41 is an OT terminal, the circular head and cylindrical tail of the OT terminal are bent. Similarly, to facilitate connection between the first cable 43 and the second circuit board 32 via the fourth connecting terminal 42, the fourth connecting terminal 42 is bent. For example, when the fourth connecting terminal 42 is an OT terminal, the circular head and cylindrical tail of the OT terminal are bent.

[0130] The conductive component 40 of this application, employing the first structural form, enables power connection between the first circuit board 31 and the second circuit board 32, and the connection method is simple. Furthermore, both the third connection terminal 41 and the fourth connection terminal 42 can be selected from common conductive terminal structures (such as OT terminals), making the components readily available and reducing the cost of power connection.

[0131] (2) The second structural form of conductive component 40: Figure 8 This is a second cross-sectional view of the power conversion device 100 provided in the embodiments of this application. Figure 9 for Figure 8 A magnified view of a section at point A2. Figure 10 for Figure 8 A magnified view of section B2 in the middle, in conjunction with reference. Figures 8 to 10As shown, conductive component 40 is a copper busbar 44.

[0132] That is, in addition to the first structural form of the conductive component 40 described above, the conductive component 40 can also be a copper busbar 44. When the conductive component 40 is a copper busbar 44, such as Figure 9 and Figure 10 As shown, one end of the copper busbar 44 is located between the head of the first screw connector 71 and the first connecting terminal 61, and the other end of the copper busbar 44 is located between the head of the second screw connector 72 and the second connecting terminal 62.

[0133] When the length direction of the copper busbar 44 is perpendicular to the surface of the first circuit board 31 and the surface of the second circuit board 32 respectively, the copper busbar 44 has a U-shaped structure to facilitate the connection between the first circuit board 31 and the second circuit board 32. For example, the copper busbar 44 is located on the same side of the first circuit board 31 and the second circuit board 32, and one end of the copper busbar 44 is bent toward the first circuit board 31, and the other end of the copper busbar 44 is bent toward the second circuit board 32.

[0134] The conductive element 40 of this application adopts the second structural form, which can also realize the power connection between the first circuit board 31 and the second circuit board 32. Since the conductive element 40 only includes copper busbar 44 in this structural form, that is, the number of components is small. Therefore, it can help reduce the cost of the power conversion device 100; and can reduce the complexity of power connection, improve power connection efficiency and connection reliability.

[0135] (3) The third structural form of conductive component 40: Figure 11 This is the third cross-sectional view of the power conversion device 100 provided in the embodiments of this application. Figure 12 for Figure 11 A magnified view of a section at A3 in the middle. Figure 13 for Figure 11 A magnified view of a section at point B3. Figure 14 for Figure 11 A magnified view of a section at point D. Please refer to this image. Figures 11 to 14The conductive component 40 includes a third connecting terminal 41, a fourth connecting terminal 42, a first connector 45, a second connector 46, a second cable 47, and a third cable 48. A portion of the second cable 47 and the third connecting terminal 41 are located within the first housing 21, and the other portion of the second cable 47 and the first connector 45 are located within the first through hole 2111. A portion of the third cable 48 and the fourth connecting terminal 42 are located within the second housing 22, and the other portion of the third cable 48 and the second connector 46 are located within the second through hole 2211. One end of the third connecting terminal 41 is fixed between the head of the first screw connector 71 and the first connecting terminal 61. The other end of the third connecting terminal 41 is connected to one end of the second cable 47. The other end of the second cable 47 is connected to one end of the first connector 45. The other end of the first connector 45 is inserted into one end of the second connector 46. The other end of the second connector 46 is connected to one end of the third cable 48. The other end of the third cable 48 is connected to one end of the fourth connecting terminal 42. The other end of the fourth connecting terminal 42 is fixed between the head of the second screw connector 72 and the second connecting terminal 62.

[0136] That is, the conductive component 40 includes a third connecting terminal 41, a second cable 47, a first connector 45, a second connector 46, a third cable 48, and a fourth connecting terminal 42 connected in sequence. The end of the third connecting terminal 41 facing away from the second cable 47 is fixed between the head of the first screw connector 71 and the first connecting terminal 61, and the end of the fourth connecting terminal 42 facing away from the third cable 48 is fixed between the head of the second screw connector 72 and the second connecting terminal 62.

[0137] The electrical connection method between the third connecting terminal 41 and the first circuit board 31, and the electrical connection method between the fourth connecting terminal 42 and the second circuit board 32 are as follows: Figure 12 and Figure 13 As shown, this connection method is the same as the electrical connection method between the third connection terminal 41 and the first circuit board 31, and the electrical connection method between the fourth connection terminal 42 and the second circuit board 32 in the first structural form of the aforementioned conductive component 40. Please refer to the above description for relevant details, which will not be repeated here.

[0138] In addition, the second cable 47 can be obtained by connecting the first connector 45 to two separate components, or it can belong to the same component (i.e., the second cable 47 is part of the first connector 45); similarly, the third cable 48 can be obtained by connecting the second connector 46 to two separate components, or it can belong to the same component (i.e., the third cable 48 is part of the second connector 46).

[0139] The conductive component 40 of this application, employing this structural form, can also achieve power connection between the first circuit board 31 and the second circuit board 32. Specifically, by placing a portion of the second cable 47 and the third connecting terminal 41 within the first housing 21, and the other portion of the second cable 47 and the first connector 45 within the first through hole 2111, the third connecting terminal 41, the second cable 47, and the first connector 45 can be assembled simultaneously when installing components within the first housing 21. Similarly, by placing a portion of the third cable 48 and the fourth connecting terminal 42 within the second housing 22, and the other portion of the third cable 48 and the second connector 46 within the second through hole 2211, the fourth connecting terminal 42, the third cable 48, and the second connector 46 can be assembled simultaneously when installing components within the second housing 22. Thus, during the assembly of the first housing 21 and the second housing 22, power connection between the first circuit board 31 within the first housing 21 and the second circuit board 32 within the second housing 22 can be achieved simply by inserting the first connector 45 and the second connector 46 into the first housing 21. This makes the power connection method between the first circuit board 31 and the second circuit board 32 simpler and easier to assemble.

[0140] For example, the first connector 45 has a plug (commonly known as a male head) and the second connector 46 has a slot (commonly known as a female head), with the plug inserted into the slot; or, the second connector 46 has a plug (commonly known as a male head) and the first connector 45 has a slot (commonly known as a female head), with the plug inserted into the slot.

[0141] Please refer to Figure 2 and Figure 3 In one embodiment of this application, the power conversion device 100 further includes a plurality of fins 90, a portion of which is fixed to the wall of the first housing 21 facing the second housing 22, and another portion of which is fixed to the wall of the second housing 22 facing the first housing 21.

[0142] By providing multiple fins 90 between the first housing 21 and the second housing 22, this application can increase the heat dissipation area of ​​the first housing 21 and the second housing 22, thereby facilitating the dissipation of heat generated by the power device 10 in the first housing 21 and the power device 10 in the second housing 22, and improving the heat dissipation effect of the power conversion device 100.

[0143] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power conversion device, characterized in that, The device includes multiple power devices, a first housing and a second housing fixedly connected together, a first circuit board located inside the first housing, and a second circuit board located inside the second housing; a portion of the multiple power devices are located inside the first housing and fixed to the first circuit board, and another portion of the multiple power devices are located inside the second housing and fixed to the second circuit board; The first housing has a first boss protruding towards the second housing on its side facing the second housing. The first boss has a first through hole extending along the arrangement direction of the first housing and the second housing, and the first through hole communicates with the internal space of the first housing. The second housing has a second boss protruding towards the first housing on its side facing the first housing. The second boss has a second through hole extending along the arrangement direction of the first housing and the second housing, and the second through hole communicates with the internal space of the second housing. The first boss and the second boss are sealed together, and the first through hole and the second through hole communicate with each other. The power conversion device further includes a conductive element passing through the first through hole and the second through hole, one end of which is electrically connected to the first circuit board and the other end of which is electrically connected to the second circuit board.

2. The power conversion device according to claim 1, characterized in that, A portion of the first boss is inserted into the second through hole, and a seal is provided between the first boss and the second boss.

3. The power conversion device according to claim 2, characterized in that, The inner wall of the second boss has a protruding structure that protrudes toward the second through hole. The side of the protruding structure away from the second boss bends toward the first boss. The second boss and the protruding structure form a first annular groove. The sealing element includes a first sealing ring located within the first annular groove, and the end of the first boss facing the second housing extends into the first annular groove and contacts the first sealing ring.

4. The power conversion device according to claim 2 or 3, characterized in that, The portion of the first boss inserted into the second boss has a second annular groove, and the second annular groove is recessed from the outer wall of the first boss toward a direction away from the second boss. The seal further includes a second sealing ring, at least a portion of which is located within the second annular groove, and the side of the second sealing ring facing the second boss contacts the inner wall of the second boss.

5. The power conversion device according to any one of claims 1-4, characterized in that, The outer wall of the first boss has a first annular guide surface; the radial dimension of the first guide surface gradually decreases along the direction from the first housing to the second housing.

6. The power conversion device according to any one of claims 1-5, characterized in that, The inner wall of the second boss has an annular second guide surface; the radial dimension of the second guide surface gradually decreases along the direction from the first housing toward the second housing.

7. The power conversion device according to any one of claims 1-6, characterized in that, The power conversion device further includes a first connecting terminal located within the first housing and a first screw connector located within the first housing; a portion of the first connecting terminal is fixedly connected to the first circuit board, the head of the first screw connector contacts one end of the conductive element, and the shank of the first screw connector passes through the conductive element and is fixed to the first connecting terminal. The power conversion device further includes a second connecting terminal and a second screw connector located within the second housing; a portion of the second connecting terminal is fixedly connected to the second circuit board, the head of the second screw connector contacts the other end of the conductive element, and the shank of the second screw connector passes through the conductive element and is fixed to the second connecting terminal.

8. The power conversion device according to claim 7, characterized in that, The power conversion device further includes a first fixing member and a second fixing member. The first fixing member is located inside the first housing and is fixed to the side of the first connecting terminal facing away from the conductive member. The rod of the first screw connector passes through the conductive member and the first connecting terminal and is threadedly connected to the first fixing member. The second fixing member is located inside the second housing and is fixed to the side of the second connecting terminal opposite to the conductive member; the rod of the second screw member passes through the conductive member and the second connecting terminal and is threadedly connected to the second fixing member.

9. The power conversion device according to claim 7 or 8, characterized in that, The first connection terminal is located on the side of the first circuit board facing the second housing, and the second connection terminal is located on the side of the second circuit board facing the first housing.

10. The power conversion device according to any one of claims 7-9, characterized in that, The conductive component includes a third connecting terminal, a fourth connecting terminal, and a first cable fixed between the third connecting terminal and the fourth connecting terminal; The third connection terminal is located inside the first housing, and the end of the third connection terminal facing away from the first cable is fixed between the head of the first screw and the first connection terminal. The fourth connection terminal is located inside the second housing, and the end of the fourth connection terminal facing away from the first cable is fixed between the head of the second screw and the second connection terminal.

11. The power conversion device according to any one of claims 7-9, characterized in that, The conductive component is a copper busbar.

12. The power conversion device according to any one of claims 7-9, characterized in that, The conductive component includes a third connecting terminal, a fourth connecting terminal, a first connector, a second connector, a second cable, and a third cable; a portion of the second cable and the third connecting terminal are located inside the first housing, and another portion of the second cable and the first connector are located inside the first through hole; a portion of the third cable and the fourth connecting terminal are located inside the second housing, and another portion of the third cable and the second connector are located inside the second through hole; One end of the third connecting terminal is fixed between the head of the first screw and the first connecting terminal. The other end of the third connecting terminal is connected to one end of the second cable. The other end of the second cable is connected to one end of the first connector. The other end of the first connector is inserted into one end of the second connector. The other end of the second connector is connected to one end of the third cable. The other end of the third cable is connected to one end of the fourth connecting terminal. The other end of the fourth connecting terminal is fixed between the head of the second screw and the second connecting terminal.

13. The power conversion device according to any one of claims 1-12, characterized in that, The power conversion device further includes a plurality of fins, a portion of which is fixed to the wall of the first housing facing the second housing, and another portion of which is fixed to the wall of the second housing facing the first housing.

14. A charging device, characterized in that, include; Charging gun; The power conversion device according to any one of claims 1-13, wherein the output terminal of the power conversion device is electrically connected to the charging gun.

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