Fuse, power conversion device and charging equipment

Abstract

The embodiment of the utility model provides a fuse, a power conversion device and charging equipment, and relates to the technical field of energy. The power conversion device comprises a circuit board and a fuse fixed on the circuit board, the fuse comprises a device shell, a first current guide strip, a second current guide strip and a fuse wire, the first current guide strip comprises a first part, a second part and a third part, the first part is located on the side, away from the circuit board, of the device shell and fixedly connected with the device shell, and the second part is located on the side, away from the circuit board, of the device shell. The second part is fixed between the first part and the third part, the second part is bent towards the circuit board from the first part, the third part and the device shell are arranged in the first direction, the third part is used for being connected with the circuit board, and the maximum size of at least one of the first part, the second part or the third part in the second direction is larger than that of the first part. The size is greater than or equal to the maximum size of the device shell in the second direction; the end, facing the circuit board, of the device shell is fixedly connected with a second guide strip which is used for being connected with the circuit board. The fuse is located within the device housing.

Description

Technical Field

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

[0002] Fuses are essential safety devices for power conversion devices and are widely used for overcurrent protection in circuits. However, as the power rating of power conversion devices continues to increase, the required fuse capacity is also gradually increasing.

[0003] In related technologies, fuses dissipate heat through an external ceramic casing, allowing the heat from the internal fuse wire to be transferred to the ceramic casing and exchanged with the air, thus cooling the fuse. However, the heat dissipation efficiency of the ceramic casing is relatively low, and fuses using this technology cannot be used in high-power conversion devices (they cannot handle large currents and will melt due to poor heat dissipation). Utility Model Content

[0004] This application provides a fuse, a power conversion device including the fuse, and a charging device including the power conversion device, which can improve the heat dissipation efficiency of the fuse and enable the fuse to have a greater current carrying capacity.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a power conversion device for converting input electrical energy into power and outputting it. The power conversion device includes a circuit board and a fuse fixed on the circuit board. The fuse includes a device housing, a first current guide bar, a second current guide bar, and a fuse wire. The first current guide bar includes a first part, a second part, and a third part. The first part is located on the side of the device housing away from the circuit board and is fixedly connected to the device housing. The second part is fixed between the first part and the third part and bends from the first part toward the circuit board. The third part is arranged with the device housing along a first direction, which is parallel to the surface of the circuit board and is used for connection to the circuit board. The maximum dimension of at least one of the first part, the second part, or the third part in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction. The second direction is perpendicular to the first direction and parallel to the surface of the circuit board. One end of the device housing facing the circuit board is fixedly connected to the second current guide bar, which is used for connection to the circuit board. The fuse wire is located inside the device housing, with one end fixedly connected to the first part and the other end fixedly connected to the second current guide bar.

[0007] After the fuse is installed, both the first and second current-carrying bars are connected to the circuit board. This allows current to flow into the circuit board through one of the first and second current-carrying bars, through the fuse wire, and then back to the circuit board through the other. When the current flowing through the fuse wire increases to a certain level (greater than the fuse wire's current threshold), the fuse wire's temperature rises, causing it to melt and break the circuit between the first and second current-carrying bars, thus providing overcurrent protection. The first current-carrying bar extends from the end of the device housing away from the circuit board to the circuit board, making it relatively long. Furthermore, at least a portion of the first current-carrying bar has a dimension in the second direction that is greater than or equal to the dimension of the device housing in the second direction; that is, at least a portion of the first current-carrying bar is relatively wide. This allows for more heat dissipation in the first current-carrying bar (e.g., a larger area for heat exchange with the air), improving the fuse's heat dissipation efficiency and giving it a greater current-carrying capacity.

[0008] In one embodiment of this application, the third part includes a first segment and a second segment fixedly connected. The first segment is fixedly connected to the second part, and the second segment is used to connect the circuit board. In a first direction, the second segment faces the second guide strip. The surface of the first segment facing the device housing and the surface of the second segment facing the second guide strip are both parallel to the surface of the device housing facing the first segment. In the first direction, the surface of the second segment facing the second guide strip is farther from the device housing than the surface of the first segment facing the device housing. The end of the second segment facing the first segment is located on the side of the second guide strip away from the circuit board.

[0009] The second segment is farther from the device housing than the first segment. In the first direction, the second guide bar is directly opposite the second segment. The increased distance between the second segment and the device housing also increases the distance between the second segment and the second guide bar. This design increases the gap between the portion of the first guide bar closest to the second guide bar (the second segment) and the second guide bar, reducing the possibility of arcing or direct conduction between them. Furthermore, the surfaces of the first segment facing the device housing and the second segment facing the second guide bar are parallel to the surface of the device housing facing the first segment, preventing excessive outward tilting of the first and second segments relative to the device housing. This results in a more uniform size for the entire fuse in the first direction, reducing its volume and the area it occupies on the circuit board. This allows for more space on the circuit board for other electronic components (e.g., power devices, inductors, etc.), improving the power density of the power conversion device. Furthermore, the surface of the second segment facing the device housing is parallel to the surface of the device housing facing the first segment. During the installation of the fuse, the second segment located at the end of the first guide bar can be made as perpendicular as possible to the circuit board, which facilitates the connection between the second segment and the circuit board, that is, facilitates the connection between the first guide bar and the circuit board.

[0010] In one embodiment of this application, the third part further includes a third segment, the first segment is fixedly connected to the second segment through the third segment, and the third segment is inclined from the first segment to the second segment toward the surface of the device housing.

[0011] The third segment is tilted away from the device housing. The distance between the third segment and the device housing increases progressively in the direction towards the circuit board. The second segment connects to the end of the third segment away from the first segment, further increasing the distance between the second segment and the device housing. When the third part includes the first, second, and third segments, making the shape of the third part resemble a "Z" reduces the risk of arcing between the first and second flow guides and also facilitates the production of the first flow guide.

[0012] In one embodiment of this application, the third part further includes a fourth segment and a fifth segment that are fixedly connected. The fourth segment is fixedly connected to the second part. The fourth segment is inclined away from the device housing in the direction toward the circuit board. The fifth segment is used to connect to the circuit board. In the first direction, the fifth segment faces the second guide bar. The surface of the fifth segment facing the device housing is parallel to the surface of the device housing facing the fifth segment.

[0013] The fourth segment is inclined away from the device housing. In the direction towards the circuit board (or closer to the second guide strip), the distance between the fourth segment and the device housing gradually increases, making the fifth segment the part of the first guide strip with the largest distance from the device housing. The fifth segment faces the second guide strip, which increases the gap between the portion of the first guide strip closest to the second guide strip and the second guide strip, reducing the possibility of arcing or direct conductivity between the two strips. Furthermore, the surface of the fifth segment facing the device housing is parallel to the surface of the device housing facing the fifth segment. During fuse installation, this allows the fifth segment to be as perpendicular as possible to the circuit board, facilitating the connection between the first guide strip and the circuit board.

[0014] In one embodiment of this application, the end face of the first part facing away from the second part is flush with the surface of the device housing facing away from the third part.

[0015] By extending the dimension of the first part in the first direction, making the end face of the first part away from the second part flush with the surface of the device housing away from the third part, the heat dissipation area of ​​the first guide strip is increased, thereby improving the heat dissipation efficiency of the fuse. Furthermore, the end of the first part away from the third part does not protrude outside the device housing; that is, this end does not affect the dimension of the fuse in the first direction. Maximizing the length of the first part in the first direction while considering the fuse's overall volume is beneficial for heat dissipation and also reduces the fuse's footprint within the power conversion device's internal space.

[0016] In one embodiment of this application, the maximum dimension of the second guide bar in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction.

[0017] At least a portion of the second guide bar has a dimension in the second direction that is greater than or equal to the dimension of the device housing in the second direction. In other words, at least a portion of the second guide bar is wider, providing more area for heat dissipation, which can improve the heat dissipation efficiency of the fuse and give the fuse a greater current carrying capacity.

[0018] In one embodiment of this application, the second guide bar includes a fourth part and a fifth part. The fourth part is located on the side of the device housing facing the circuit board and is fixedly connected to the device housing. The fourth part is fixedly connected to the fuse. The fifth part is located on the side of the fourth part away from the third part. The fifth part bends from the fourth part toward the circuit board and is used to connect to the circuit board.

[0019] Since the fifth part is located on the side of the fourth part away from the third part, the part where the second guide bar is connected to the circuit board can be farther away from the part where the first guide bar is connected to the circuit board, reducing the possibility of arcing or direct conduction between the second guide bar and the first guide bar.

[0020] In one embodiment of this application, the end face of the fourth portion facing away from the fifth portion is flush with the surface of the device housing facing the third portion.

[0021] By extending the length of the fourth part in the first direction, the end face of the fourth part away from the fifth part is made flush with the surface of the device housing facing the third part. While taking into account the volume of the fuse, the length of the fourth part in the first direction is maximized, which is beneficial to the heat dissipation of the fuse and also reduces the space occupied by the fuse in the internal space of the power conversion device.

[0022] In one embodiment of this application, the maximum size of the device housing in the first direction and the maximum size of the device housing in the second direction are both smaller than the maximum size of the device housing in the direction perpendicular to the surface of the circuit board.

[0023] The component housing has the largest dimensions in the direction perpendicular to the circuit board surface. This can be understood as the component housing being mounted vertically on the circuit board, which further reduces the area occupied by the fuse on the circuit board (a fuse placed horizontally occupies a larger area). This allows more area on the circuit board to be used for the installation of other electronic components, which is beneficial for improving the power density of the power conversion device.

[0024] In one embodiment of this application, the power conversion device further includes a liquid cooling plate, which has a cooling channel for the flow of cooling medium, and at least one of the first guide bar or the device housing is connected to the liquid cooling plate; or, the power conversion device further includes a protective shell and a fan, the circuit board and the fuse are both located inside the protective shell, the protective shell has a specific air vent, the fan is fixed at the air vent of the protective shell, and the air inlet end and the air outlet end of the fan are arranged along a second direction.

[0025] In one scenario, the power conversion device can employ liquid cooling for heat dissipation, connecting the first flow guide bar to the liquid cooling plate, or connecting both the first flow guide bar and the device housing to the liquid cooling plate. In this way, the heat from the fuse can be transferred to the liquid cooling plate through the device housing and the first flow guide bar, and then exchanged with the fuse through the liquid cooling plate, accelerating the fuse's heat dissipation.

[0026] In another scenario, the power conversion device can be cooled by air. With the help of a fan, the air inside the protective housing flows through the fuse in the second direction as much as possible. In this way, the device housing, the first guide strip and the second guide strip will have more areas to exchange heat with the air blown out by the fan, making full use of the surface of the device housing, the first guide strip and the second guide strip for heat dissipation and improving the heat dissipation efficiency of the fuse.

[0027] A second aspect of this application provides a charging device, which includes a device cabinet, a charging connector, and a power conversion device. The power conversion device is located inside the device cabinet, and the charging connector is located outside the device cabinet and electrically connected to the output terminal of the power conversion device. The charging connector is used to charge the device to be charged.

[0028] The power conversion device can convert the input AC power into DC power and output it to the charging connector, which can then charge the device to be charged. Furthermore, the charging device provided in this application includes the aforementioned power conversion device. Therefore, the charging device provided in this application and the power conversion device of the above-mentioned technical solutions can solve the same technical problems and have the same technical effects, which will not be elaborated further here.

[0029] A third aspect of this application provides a fuse comprising a device housing, a first guide bar, a second guide bar, and a fuse wire. The device housing has a first end and a second end opposite to each other. The first guide bar comprises a first portion, a second portion, and a third portion. The first portion is located on the side of the first end of the device housing away from the second end and is fixedly connected to the first end. The second portion is fixed between the first portion and the third portion and is bent from the first portion toward the second end. The third portion is arranged with the device housing along a first direction. The maximum dimension of at least one of the first portion, the second portion, or the third portion in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction. The first direction and the second direction are perpendicular to each other and both perpendicular to the arrangement direction of the first end and the second end. The second guide bar is fixedly connected to the second end of the device housing. The fuse wire is located inside the device housing, with one end of the fuse wire fixedly connected to the first portion and the other end of the fuse wire fixedly connected to the second guide bar.

[0030] Current flows into the circuit through one of the first and second current-conducting bars, passes through the fuse, and then flows back to the circuit board through the other current-conducting bar. When the current flowing through the fuse increases to a certain level (greater than the fuse's current threshold), the fuse's temperature rises, causing it to melt and break the circuit between the first and second current-conducting bars, thus providing overcurrent protection. At least a portion of the first current-conducting bar has a dimension in the second direction that is greater than or equal to the dimension of the device housing in the second direction; that is, at least a portion of the first current-conducting bar is wider, providing more area for heat dissipation (e.g., a larger area of ​​the first current-conducting bar for heat exchange with air), which improves the fuse's heat dissipation efficiency and gives the fuse a greater current-carrying capacity.

[0031] In one embodiment of this application, the third part includes a first segment and a second segment that are fixedly connected. The first segment is fixedly connected to the second part, and the second segment is located on the side of the first segment away from the second part. In a first direction, the second segment faces the second guide strip. The surface of the first segment facing the device housing and the surface of the second segment facing the second guide strip are both parallel to the surface of the device housing facing the first segment. The surface of the second segment facing the second guide strip is farther away from the device housing than the surface of the first segment facing the device housing.

[0032] The second segment is farther from the device housing than the first segment. In the first direction, the second guide bar is directly opposite the second segment. The increased distance between the second segment and the device housing also increases the distance between the second segment and the second guide bar. This design increases the gap between the portion of the first guide bar closest to the second guide bar (the second segment) and the second guide bar, reducing the possibility of arcing or direct conduction between them. Furthermore, the surfaces of the first segment facing the device housing and the second segment facing the second guide bar are parallel to the surface of the device housing facing the first segment, preventing excessive outward tilting of the first and second segments relative to the device housing. This results in a more uniform size for the entire fuse in the first direction, reducing its volume. Additionally, the parallelism between the surface of the second segment facing the device housing and the surface of the device housing facing the first segment allows the second segment, located at the end of the first guide bar, to be as perpendicular as possible to the circuit board during fuse installation, facilitating connection between the second segment and the circuit board, and consequently, the connection between the first guide bar and the circuit board.

[0033] In one embodiment of this application, the third part further includes a third segment, the first segment is fixedly connected to the second segment through the third segment, and the third segment is inclined from the first segment to the second segment toward the surface of the device housing.

[0034] The third section is tilted away from the device housing, and the second section is connected to the end of the third section away from the first section, increasing the distance between the second section and the device housing. In the case where the third part includes the first, second, and third sections, the shape of the third part is similar to a "Z" shape, which can reduce the risk of arcing between the first and second guide strips and facilitate the production of the first guide strip.

[0035] In one embodiment of this application, the third part further includes a fourth segment and a fifth segment that are fixedly connected. The fourth segment is fixedly connected to the second part. The fourth segment is inclined toward the side away from the device housing in the direction from the first end to the second end. The fifth segment is located on the side of the fourth segment away from the second part. The surface of the fifth segment facing the second guide strip is parallel to the surface of the device housing facing the fourth segment. In the first direction, the fifth segment faces the second guide strip.

[0036] The fourth segment is inclined away from the device housing. As it approaches the second flow guide, the distance between the fourth segment and the device housing gradually increases. This increases the gap between the portion of the first flow guide closest to the second flow guide (the fifth segment) and the second flow guide, reducing the possibility of arcing or direct conductivity between the first and second flow guides. Furthermore, the surface of the fifth segment facing the second flow guide is parallel to the surface of the device housing facing the fourth segment. During fuse installation on the circuit board, this allows the fifth segment to be as perpendicular as possible to the circuit board, facilitating the connection between the first flow guide and the circuit board.

[0037] In one embodiment of this application, the maximum dimension of the second guide bar in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction.

[0038] At least a portion of the second guide bar has a dimension in the second direction that is greater than or equal to the dimension of the device housing in the second direction. In other words, at least a portion of the second guide bar is wider, providing more area for heat dissipation, which can improve the heat dissipation efficiency of the fuse and give the fuse a greater current carrying capacity.

[0039] In one embodiment of this application, the second guide bar includes a fourth part, a fifth part, and a sixth part. The fourth part is located on the side of the second end of the device housing away from the first end and is fixedly connected to the second end. The fourth part is fixedly connected to a fuse. The fifth part is located on the side of the fourth part away from the third part. The fifth part is fixed between the fourth part and the sixth part. The fifth part bends from the fourth part toward the side away from the device housing. The sixth part and the third part are arranged along the first direction.

[0040] Since the fifth part is located on the side of the fourth part away from the third part, and the fifth part is fixed between the fourth part and the sixth part, the third part of the first guide bar and the sixth part of the second guide bar can be arranged along the first direction, and the third part of the first guide bar and the sixth part of the second guide bar are separated by a large distance, reducing the possibility of arcing or direct connection between the third part of the first guide bar and the sixth part of the second guide bar. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of another charging device provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a power module provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the topology of a power module provided in an embodiment of this application;

[0045] Figure 5 A schematic diagram of a circuit board structure provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of the structure of a fuse provided in an embodiment of this application;

[0047] Figure 7 for Figure 5 A schematic diagram of the fuse and circuit board from another perspective;

[0048] Figure 8 This is a schematic diagram of the structure of a third part provided in an embodiment of this application;

[0049] Figure 9 This is a schematic diagram of another third part provided in an embodiment of this application;

[0050] Figure 10 This is a schematic diagram of the structure of a second guide bar provided in an embodiment of this application;

[0051] Figure 11 This is a schematic diagram of another second guide bar provided in an embodiment of this application;

[0052] Figure 12 This is a schematic diagram of the structure of a liquid cooling plate provided in an embodiment of this application;

[0053] Figure 13 This is a schematic diagram of the structure of a fan provided in an embodiment of this application;

[0054] Figure 14 This is a schematic diagram of the air inlet and air outlet of a fan provided in an embodiment of this application.

[0055] Figure label:

[0056] 100-Charging equipment; 10-Equipment cabinet; 20-Power conversion device; 201-Power module; 202-AC-DC power conversion circuit; 30-AC power distribution device; 40-DC power distribution device; 50-Charging connector; 60-Cable; 70-Connecting wire; 80-Terminal cabinet; 1-Protective shell; 11-Input port; 12-Output port; 13-Air outlet; 131-Air inlet; 132-Air outlet; 2-Fuse; 21-Component shell; 211-First end; 212-Second end; 22-Fuse wire; 221-Round hole; 222-Fuse section; 23-First guide bar; 231- Part 1; 232-Part 2; 233-Part 3; 2331-First Segment; 2332-Second Segment; 2333-Third Segment; 2334-Fourth Segment; 2335-Fifth Segment; 234-First Opening; 24-Second Guide Strip; 241-Fourth Segment; 242-Fifth Segment; 243-Sixth Segment; 244-Second Opening; 25-First Connecting Piece; 26-Second Connecting Piece; 3-Circuit Board; 31-First Socket; 32-Second Socket; 4-Liquid Cooling Plate; 41-Cooling Channel; 42-Glue Tank; 5-Thermal Conductive Glue; 6-Fan; 61-Air Inlet; 62-Air Outlet. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0058] In this application, the terms "first," "second," etc., are used for descriptive purposes only to distinguish one element from another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0059] In this application, unless otherwise expressly stated and limited, "multiple" means two or more.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines or channels, the terms "connection" and "linkage" as used in this application have the meaning of establishing electrical conductivity. The specific meaning needs to be understood in conjunction with the context.

[0061] Furthermore, in this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0062] In the accompanying drawings of the embodiments of this application, solid structures such as components and devices are represented by guide lines, and structures composed of multiple components are represented by guide lines with brackets or solid arrows; hollow structures such as openings, holes, spaces, cavities, or virtual bodies such as directions and orientations are all represented by guide lines with hollow arrows.

[0063] This application provides a charging device 100. Figure 1 An exemplary structure of a charging device 100 is shown, with reference to Figure 1 The charging equipment 100 is an integrated charging pile. The charging equipment 100 includes an equipment cabinet 10, a power conversion device 20, an AC power distribution device 30, and a DC power distribution device 40, all of which are housed within the equipment cabinet 10.

[0064] In some examples, the AC power distribution unit 30 includes at least one AC switch (e.g., a relay, contactor, etc.), protective devices (e.g., fuses, surge protectors, etc.), etc. See reference. Figure 1 The input terminal of the AC power distribution device 30 is used to electrically connect to a power source (e.g., the input terminal of an AC switch is electrically connected to a power source), which can be the power grid. The output terminal of the AC power distribution device 30 is electrically connected to a power conversion device 20 (e.g., the output terminal of an AC switch is electrically connected to a power conversion device 20). The AC switch of the AC power distribution device 30 is used to control the on / off state of the circuit between the power source and the power conversion device 20. The protection device of the AC power distribution device 30 is used to provide protection for the circuit (disconnecting the circuit or shunting the current). The power conversion device 20 is used to convert the current input to the AC power distribution device 30 (from the power source) into DC power before outputting it. For example, the power conversion device 20 is used to convert the AC power input from the power grid into DC power before outputting it. The output terminal of the power conversion device 20 is connected to the input terminal of the DC power distribution device 40, which can be used for power distribution. For example, the DC power distribution device 40 includes multiple DC switches (relays, contactors, etc.) to control the on / off state of the circuit through the DC switches, thereby distributing the output power of the power conversion device 20. In some other examples, the DC power distribution device 40 is used only to control the on / off of the circuit between the charging connector 50 and the power conversion device 20, and cannot control the amount of power that the charging connector 50 can draw upon.

[0065] In addition, the charging device 100 also includes a charging connector 50 (e.g., a charging gun) and a cable 60, see reference. Figure 1 There are two charging connectors 50 and two cables 60, with each charging connector 50 connected to one cable 60. In some other examples, there are one or more charging connectors 50 and cables 60. This application does not impose a specific limit on the number of charging connectors 50 and cables 60. The charging connector 50 is located outside the equipment cabinet 10 and is used to connect the device to be charged (e.g., an electric vehicle). The charging connector 50 is connected to the output terminal of the DC power distribution device 40 via the cable 60, enabling the charging connector 50 to access the power output of the power conversion device 20 through the DC power distribution device 40. For example, the power conversion device 20 includes multiple AC-DC modules (capable of converting alternating current to direct current). The charging connector 50 can access the power output of one AC-DC module through the DC power distribution device 40, or it can access the power output of several AC-DC modules through the DC power distribution device 40.

[0066] Figure 2 An exemplary structure of another charging device 100 is shown, with reference to Figure 2The charging device 100 is a split-type charging pile, which includes a main unit, a terminal unit, and a connecting cable 70 for connecting the main unit and the terminal unit.

[0067] Among them, reference Figure 2 The main unit of the charging equipment 100 includes an equipment cabinet 10, a power conversion device 20, an AC power distribution device 30, and a DC power distribution device 40, all of which are housed within the equipment cabinet 10. The input terminal of the AC power distribution device 30 is electrically connected to a power source, the output terminal of the AC power distribution device 30 is electrically connected to the input terminal of the power conversion device 20, and the output terminal of the power conversion device 20 is electrically connected to the input terminal of the DC power distribution device 40.

[0068] Reference Figure 2 The terminal portion of the charging equipment 100 includes a terminal cabinet 80, a charging connector 50, and a cable 60. The cabinet 80 contains a transfer device (or terminal power distribution device, such as a DC switch, protection devices, etc.), while the charging connector 50 is located outside the cabinet 80. The output of the DC power distribution device 40 is connected to the input of the transfer device inside the cabinet 80 via a connecting cable 70. The output of the transfer device is connected to the input of the charging connector 50 via the cable 60. In other words, the charging connector 50 is electrically connected to the power conversion device 20 via the cable 60, the transfer device, the connecting cable 70, and the DC power distribution device 40.

[0069] exist Figure 1 and Figure 2 In the example shown, the power conversion device 20 may include a plurality of power modules 201. Figure 3 An exemplary structure of a power module 201 is shown. For example, multiple power modules 201 include multiple AC-DC modules, which can convert input AC power into DC power and output it to the charging connector 50. As another example, multiple power modules 201 include multiple AC-DC modules and multiple DC-DC modules, with the AC-DC modules electrically connected to the DC-DC modules via a DC bus. The multiple AC-DC modules (power modules 201) convert the input AC power into DC power and output it to the multiple DC-DC modules via the DC bus for boosting or bucking. The DC power output from the multiple DC-DC modules is then transmitted to the charging connector 50.

[0070] In some other examples, the power conversion device 20 includes a power module 201 (AC-DC module or DC-DC module).

[0071] Reference Figure 3 The power module 201 includes a protective housing 1, on which an input port 11 and an output port 12 are provided. Figure 4 An exemplary topology diagram of a power module 201 is shown, wherein the power module 201 (which is an AC-DC module) further includes an AC-DC power conversion circuit 202. After AC power is input from the input port 11, it is converted into DC power by the AC-DC power conversion circuit 202 and output from the output port 12.

[0072] In addition, refer to Figure 4 The power module 201 (which is an AC-DC module) also includes a fuse 2. Figure 4 In the example shown, multiple fuses 2 are provided, including multiple first fuses and multiple second fuses. In the event of an abnormal input current (excessive current), the multiple first fuses can disconnect the electrical connection between the AC-DC power conversion circuit 202 and the input port 11. In the event of an abnormal output current, the multiple second fuses can disconnect the electrical connection between the AC-DC power conversion circuit 202 and the output port 12.

[0073] In other examples, power module 201 can also be a DC-DC module, which further includes a DC-DC power conversion circuit. After DC power is input from input port 11, it is boosted or bucked by the DC-DC power conversion circuit and then output from output port 12. In this example, power module 201 also includes multiple fuses 2. Some fuses 2 are used to disconnect the electrical connection between the DC-DC power conversion circuit and input port 11, while others are used to disconnect the electrical connection between the DC-DC power conversion circuit and output port 12.

[0074] Among them, fuse 2 is fixed on circuit board 3. Figure 5 An exemplary embodiment shows a structure in which a fuse 2 is fixed to a circuit board 3. In some examples, Figure 5 The circuit board 3 can also be fixed with other electronic components such as power devices (devices used for power conversion). In some other examples, the power devices are fixed on other circuit boards.

[0075] Figure 6 An exemplary structure of a fuse 2 is shown, with reference to Figure 5 and Figure 6The fuse 2 includes a housing 21 and a fuse wire 22. The housing 21 can be any structure that can serve as a casing; for example, the housing 21 can be a ceramic casing (to facilitate heat dissipation of the fuse 2). The housing 21 has opposing first ends 211 and second ends 212, the arrangement of which is perpendicular to the surface of the circuit board 3 (any surface of the circuit board 3). The first end 211 is farther from the circuit board 3 than the second end 212. The fuse wire 22 is located inside the housing 21. Figure 6 In the example shown, the fuse 22 is sheet-shaped (e.g., a metal sheet), and multiple circular holes 221 are provided on the fuse 22. In the arrangement direction of the first end 211 and the second end 212, the multiple circular holes 221 are distributed in multiple rows of circular hole groups. Each row of circular hole groups includes multiple circular holes 221. The multiple circular holes 221 in each row of circular hole groups are spaced apart, so that a relatively narrow part (fuse portion 222) is formed between two adjacent circular holes 221 in each row of circular hole groups. When the current flowing through the fuse 22 increases to a certain extent (greater than the current threshold of the fuse 22), the temperature of the fuse 22 rises, causing the fuse 22 to melt (multiple fuse portions 222 melt), thus playing the role of circuit overcurrent protection.

[0076] In addition, refer to Figure 5 The device housing 21 is vertically mounted on the circuit board 3. The maximum dimensions of the device housing 21 in the first direction and the second direction are both smaller than its maximum dimension in the direction perpendicular to the surface of the circuit board 3. In other words, the dimensions of the device housing 21 in the first direction and the second direction are both smaller than the dimensions from the first end 211 to the second end 212. Maximizing the dimension of the device housing 21 in the direction perpendicular to the surface of the circuit board 3 can be understood as vertically mounting the device housing 21 on the circuit board 3, reducing the area occupied by the fuse 2 on the circuit board 3, and allowing more area on the circuit board 3 to be used for mounting other electronic components, which is beneficial for improving the power density of the power conversion device 20.

[0077] Reference Figure 5 The fuse 2 also includes a first guide bar 23 and a second guide bar 24 located outside the device housing 21. Both the first guide bar 23 and the second guide bar 24 are fixedly connected to the device housing 21 (e.g., by bolts). One end of the fuse wire 22 is fixedly connected to the first guide bar 23, and the other end of the fuse wire 22 is fixedly connected to the second guide bar 24. For example, in... Figure 6In the example shown, the fuse 2 also includes a first connecting piece 25 and a second connecting piece 26 located within the device housing 21. One end of the first guide bar 23 is fixedly connected to the first connecting piece 25 (e.g., welded), and the other end of the second guide bar 24 is fixedly connected to the second connecting piece 26 (e.g., welded). The first connecting piece 25 is connected to the first guide bar 23 (e.g., fixedly connected by bolts), and the second connecting piece 26 is connected to the second guide bar 24 (e.g., fixedly connected by bolts). That is, one end of the fuse 22 is fixedly connected to the first guide bar 23 via the first connecting piece 25, and the other end of the fuse 22 is fixedly connected to the second guide bar 24 via the second connecting piece 26. In some other examples, after the first flow guide 23 is fixed to the device housing 21, the first flow guide 23 contacts the first connecting piece 25, and the second flow guide 24 contacts the second connecting piece 26. This example also belongs to the category described in this application where one end of the fuse 22 is fixedly connected to the first flow guide 23 through the first connecting piece 25, and the other end of the fuse 22 is fixedly connected to the second flow guide 24 through the second connecting piece 26.

[0078] In some other examples, the first connecting piece 25 and the second connecting piece 26 are not provided inside the device housing 21, one end of the fuse 22 is fixedly connected to the first guide bar 23 (e.g., soldered), and the other end of the fuse 22 is fixedly connected to the second guide bar 24 (e.g., soldered).

[0079] Figure 6 Only one fuse 22 is shown in the figure. In some other examples, multiple fuses 22 are provided in the device housing 21. The multiple fuses 22 are arranged side by side, and each of the multiple fuses 22 is fixedly connected at one end to the first guide bar 23 and at the other end to the second guide bar 24.

[0080] The materials of the first current-conducting strip 23 and the second current-conducting strip 24 can be any material capable of conducting current. For example, both the first current-conducting strip 23 and the second current-conducting strip 24 are metal sheets. The first current-conducting strip 23 and the second current-conducting strip 24 are both connected to the circuit board 3, so that current can flow into one of the first current-conducting strip 23 and the second current-conducting strip 24, pass through the fuse 22, and then flow out from the other of the first current-conducting strip 23 and the second current-conducting strip 24.

[0081] Figure 7 An example is shown Figure 5 A view of fuse 2 and circuit board 3 from another perspective, see reference. Figure 7The first guide bar 23 includes a first part 231, a second part 232 and a third part 233. The first part 231 is located on the side of the device housing 21 away from the circuit board 3 and is fixedly connected to the device housing 21. The second part 232 is fixed between the first part 231 and the third part 233. The second part 232 bends from the first part 231 toward the circuit board 3. That is, the second part 232 is a bent part (for example, the second part 232 is arc-shaped or angled). Since one end of the second part 232 is connected to the first part 231 and the other end of the second part 232 is connected to the third part 233, when the second part 232 is bent, the first part 231 and the third part 233 are located on different sides of the device housing 21. The first part 231 is located on the side of the device housing 21 away from the circuit board 3, while the third part 233 and the device housing 21 are arranged along the first direction (and there may be a gap between them). It should be noted that the first direction in this application is the arrangement direction of the third part 233 and the device housing 21. The first direction is perpendicular to the arrangement direction of the first end 211 and the second end 212 of the device housing 21. After the fuse 2 is installed on the circuit board 3, the first direction is parallel to the surface of the circuit board 3 (the surface of any side of the circuit board 3). The third part 233 extends toward the circuit board 3 and is used to connect with the circuit board 3. For example, the end of the third part 233 near the circuit board 3 is toothed, and the third part 233 is inserted into the circuit board 3 and then soldered to the circuit board 3.

[0082] Reference Figure 6 and Figure 7 The maximum dimension of at least one of the first part 231, the second part 232, or the third part 233 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. The second direction is perpendicular to the first direction and parallel to the surface of the circuit board 3. That is, the first direction, the second direction, and the arrangement direction of the first end 211 and the second end 212 of the device housing 21 are all perpendicular to each other.

[0083] In the dimensional comparison described in the statement that "the maximum dimension of at least one of the first part 231, the second part 232, or the third part 233 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction," the word "equal to" allows for an error of 5 mm. That is, as long as the difference between the two dimensions is within 5 mm, it falls under the category of "equal to" in this application. "Greater than" means at least 5 mm more than, that is, the difference between the two dimensions must be at least greater than 5 mm to fall under the category of "greater than" in this application.

[0084] At least a portion of the first guide strip 23 has a maximum dimension in the second direction that is greater than or equal to the dimension of the device housing 21 in the second direction. That is, it is sufficient for at least a portion of the first guide strip 23 to have a dimension in the second direction that is greater than or equal to the dimension of the device housing 21 in the second direction. The first guide strip 23 can be made wider in the second direction, and it extends from the end of the device housing 21 away from the circuit board 3 to the circuit board 3, making the length of the first guide strip 23 longer. This allows the first guide strip 23 to have a larger area for heat dissipation (e.g., a larger area for heat exchange with air), improving the heat dissipation efficiency of the fuse 2 and giving the fuse 2 a greater current-carrying capacity.

[0085] For example, in Figure 6 In the example shown, the first part 231, the second part 232, and the third part 233 have equal dimensions in the second direction, which facilitates the production and processing of the first guide strip 23 (the first guide strip 23 can be formed by bending a metal sheet of equal width). Furthermore, the dimensions of the first part 231, the second part 232, and the third part 233 in the second direction are all equal to the dimensions of the device housing 21 in the second direction. That is, the overall dimension of the first guide strip 23 in the second direction is equal to the dimension of the device housing 21 in the second direction, ensuring that even when the size of the first guide strip 23 is increased, it does not protrude beyond the outer side of the device housing 21 in the second direction. Without increasing the size of the fuse 2 in the second direction, the size of the first guide bar 23 in the second direction is maximized. This is beneficial for the heat dissipation of the fuse 2, while also taking into account the size of the fuse 2. This reduces the space occupied by the fuse 2 inside the protective shell 1 and also reduces the area occupied by the fuse 2 on the circuit board 3. This allows more area on the circuit board 3 to be used for the installation of other electronic components (e.g., power devices, capacitors, inductors, etc.), which is beneficial for improving the power density of the power conversion device 20.

[0086] In some other examples, the dimensions of the first part 231, the second part 232, and the third part 233 in the second direction are equal, and the dimensions of the first part 231, the second part 232, and the third part 233 in the second direction are all larger than the dimensions of the device housing 21 in the second direction, which increases the width of the first guide strip 23 in the second direction, allowing the first guide strip 23 to have more area for heat dissipation, thus improving the heat dissipation effect of the fuse 2.

[0087] In other examples, among the first portion 231, the second portion 232, and the third portion 233, only the maximum dimension of the third portion 233 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. For example, in the direction from the first end 211 to the second end 212 of the device housing 21, the dimensions of the third portion 233 in the second direction are equal (the width of the third portion 233 is uniform), and the dimension of the third portion 233 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. In this example, the third portion 233 mainly assists the device housing 21 in heat dissipation, and the dimensions of the first portion 231 and the second portion 232 are not specifically limited. Alternatively, among the first portion 231, the second portion 232, and the third portion 233, only the maximum dimension of the first portion 231 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. In this example, the first portion 231 mainly assists the device housing 21 in heat dissipation, and the dimensions of the second portion 232 and the third portion 233 are not specifically limited. Alternatively, among the first part 231, the second part 232, and the third part 233, only the second part 232 has a maximum dimension in the second direction that is greater than or equal to the maximum dimension in the second direction of the device housing 21.

[0088] Furthermore, the volume and heat dissipation area of ​​the first guide bar 23 can be further increased by extending the dimension of the first portion 231 in the first direction, for example, referring to Figure 7 The end face (end face a1) of the first portion 231 facing away from the second portion 232 in the first direction is flush with the surface (surface b1) of the device housing 21 facing away from the third portion 233. The flushing in this application allows for a deviation of 3mm. By extending the length of the first portion 231, the heat dissipation area of ​​the first guide strip 23 is increased, thereby improving the heat dissipation efficiency of the fuse 2. Furthermore, the end of the first portion 231 facing away from the second portion 232 does not protrude outside the device housing 21. That is, the end of the first portion 231 facing away from the second portion 232 does not affect the dimensions of the fuse 2 in the first direction. Maximizing the length of the first portion 231 in the first direction while considering the volume of the fuse 2 is beneficial for the heat dissipation of the fuse 2 and also reduces the space occupied by the fuse 2 inside the protective housing 1.

[0089] In other examples, the third portion 233 of the first guide strip 23 can be a flat metal sheet, with the surface of the third portion 233 facing the device housing 21 parallel to the surface of the device housing 21 facing the third portion 233. In one example provided in this application, the third portion 233 can also be bent, for example, Figure 8 An exemplary structure of the third part 233 is shown. Figure 8 Part 3, 233 and Figure 7The third part, 233, has the same structure as in [the previous text], see [the original text]. Figure 7 and Figure 8 The third part 233 includes a first segment 2331, a second segment 2332 and a third segment 2333, wherein the third segment 2333 is fixed to the first segment 2331 and the second segment 2332, for example, the first segment 2331, the second segment 2332 and the third segment 2333 are integrally connected.

[0090] Reference Figure 7 and Figure 8 The first segment 2331, with one end facing away from the circuit board 3, is fixedly connected to the second part 232. That is, the second part 232 is fixed between the first part 231 and the first segment 2331 of the third part 233. The surface (surface b2) of the first segment 2331 facing the device housing 21 is parallel to the surface (surface b3) of the device housing 21 facing the first segment 2331. The surface (surface b4) of the second segment 2332 facing the device housing 21 is parallel to the surface (surface b3) of the device housing 21 facing the first segment 2331. A 10° error is allowed for this "parallelism." Furthermore, the surface (surface b5) of the third segment 2333 facing the device housing 21 is inclined from the first segment 2331 towards the second segment 2332, so that the surface of the first segment 2331 facing the device housing 21 is closer to the device housing 21 than the surface of the second segment 2332 facing the device housing 21. For example, in... Figure 8 In the first segment 2331, the distance (L1) between the surface of the first segment 2331 facing the device housing 21 and the device housing 21 is smaller than the distance (L2) between the surface of the second segment 2332 facing the device housing 21 and the device housing 21.

[0091] The first segment 2331 and the third segment 2333 have a bend, or in other words, the first segment 2331 is fixedly connected to the third segment 2333 through a bend. The bend between the first segment 2331 and the third segment 2333 is arc-shaped and bends (or folds) from the first segment 2331 toward the side away from the device housing 21. The second segment 2332 and the third segment 2333 also have a bend, or in other words, the second segment 2332 is fixedly connected to the third segment 2333 through a bend. The bend between the second segment 2332 and the third segment 2333 is arc-shaped and bends from the third segment 2333 toward the circuit board 3.

[0092] Reference Figure 8The second segment 2332 is used to connect to the circuit board 3. For example, the end of the second segment 2332 facing the circuit board 3 is toothed and inserted into the circuit board 3. Furthermore, in the first direction, the second segment 2332 faces (or is directly opposite) the second guide strip 24. For example, the distance (L3) between the end (d1) of the second segment 2332 facing the first segment 2331 and the circuit board 3 is greater than or equal to the distance (d1) between the end of the second guide strip 24 and the end facing away from the circuit board 3. Figure 8 The distance (L4) between the second guide bar 24 (facing away from the surface of the circuit board 3) and the circuit board 3 is shown in the figure. Figure 8 The diagram illustrates the case where L3 is greater than L4. That is, in the first direction, the second guide bar 24 is directly opposite the second segment 2332. With the inclination of the third segment 2333, the second segment 2332 is the part of the first guide bar 23 furthest from the device housing 21. The second segment 2332 is also the part of the first guide bar 23 furthest from the second guide bar 24. By aligning the second guide bar 24 directly with the second segment 2332, the gap between the part of the first guide bar 23 closest to the second guide bar 24 (the second segment 2332) and the second guide bar 24 can be maximized, reducing the possibility of arcing or direct conduction between the first guide bar 23 and the second guide bar 24.

[0093] Furthermore, referring to Figure 7 and Figure 8 The surface of the first segment 2331 facing the device housing 21 (surface b2) and the surface of the second segment 2332 facing the second guide bar 24 (surface b4) are both parallel to the surface of the device housing 21 facing the first segment 2331 (surface b3). This prevents the first segment 2331 and the second segment 2332 from tilting excessively outward relative to the device housing 21. The dimensions of the entire fuse 2 are relatively uniform in the first direction, which reduces the volume of the fuse 2 and the area occupied by the fuse 2 on the circuit board 3. This allows more area on the circuit board 3 to be used for the installation of other electronic components (e.g., power devices, inductors, etc.), which is beneficial for improving the power density of the power conversion device 20.

[0094] In addition, Figure 7 and Figure 8 In the example shown, the surface (surface b4) of the second segment 2332 facing the second guide bar 24 is parallel to the surface (surface b3) of the device housing 21 facing the first segment 2331. During the installation of the fuse 2, the second segment 2332 located at the end of the first guide bar 23 can be made as perpendicular as possible to the circuit board 3, so as to facilitate the connection between the second segment 2332 and the circuit board 3, that is, to facilitate the connection between the first guide bar 23 and the circuit board 3.

[0095] exist Figure 7 and Figure 8In the example shown, the third segment 2333 is tilted away from the device housing 21. In the direction towards the circuit board 3, the distance between the third segment 2333 and the device housing 21 will increase. The second segment 2332 is connected to the end of the third segment 2333 that is away from the first segment 2331, which increases the distance between the second segment 2332 and the device housing 21. Therefore, the function of the third segment 2333 can be understood as making the second segment 2332 farther away from the device housing 21. If it is necessary to change the distance between the second segment 2332 and the device housing 21, it is only necessary to change the tilt of the third segment 2333.

[0096] In the example in Part 3, 233, which includes Paragraph 2331, Paragraph 2332, and Paragraph 2333, refer to Figure 7 and Figure 8 This makes the shape of the third part 233 resemble a "Z" shape, which can reduce the risk of arcing between the first guide bar 23 and the second guide bar 24, and also facilitate the production of the first guide bar 23.

[0097] In some other examples, there is no obvious inclined segment between the first segment 2331 and the second segment 2332 (e.g., there is no third segment 2333). For example, the third part 233 includes the first segment 2331 and the second segment 2332, and the surface of the first segment 2331 facing the device housing 21 and the surface of the second segment 2332 facing the second guide bar 24 are both parallel to the surface of the device housing 21 facing the first segment 2331. However, in this example, the first segment 2331 and the second segment 2332 are fixedly connected by a bending segment. The bending segment between the first segment 2331 and the second segment 2332 can be similar to an "S" shape. This bending segment first bends from the first segment 2331 toward the side away from the device housing 21, and then bends toward the circuit board 3, so that the distance between the surface of the first segment 2331 facing the device housing 21 and the device housing 21 is less than the distance between the surface of the second segment 2332 facing the second guide bar 24 and the device housing 21.

[0098] In some other examples, refer to Figure 9 , Figure 9An exemplary embodiment shows another structure of the third part 233, which further includes a fourth segment 2334 and a fifth segment 2335 fixedly connected (e.g., integrally connected). The fourth segment 2334 is fixedly connected to the second part 232 and is inclined away from the device housing 21 in the direction toward the circuit board 3. That is, in the direction toward the circuit board 3 (or in the direction closer to the second guide bar 24), the distance between the fourth segment 2334 and the device housing 21 gradually increases. The fifth segment 2335 is used to connect the circuit board 3, and in the first direction, the fifth segment 2335 faces the second guide bar 24, so that the fifth segment 2335 is directly opposite the second guide bar 24. That is, the fifth segment 2335 is the part of the first guide bar 23 with the largest distance from the device housing 21, which increases the gap between the part of the first guide bar 23 close to the second guide bar 24 (the fifth segment 2335) and the second guide bar 24, reducing the possibility of arcing or direct conduction between the first guide bar 23 and the second guide bar 24.

[0099] Furthermore, the surface (b6) of the fifth segment 2335 facing the second guide bar 24 is parallel to the surface (b3) of the device housing 21 facing the fourth segment 2334. During the installation of the fuse 2, the fifth segment 2335 can be made as perpendicular as possible to the circuit board 3, facilitating the connection between the first guide bar 23 and the circuit board 3. The fourth segment 2334 and the fifth segment 2335 have a bend, or in other words, the fourth segment 2334 is fixedly connected to the fifth segment 2335 through a bend. The bend between the fourth segment 2334 and the fifth segment 2335 is arc-shaped, and the bend between the fourth segment 2334 and the fifth segment 2335 bends from the fourth segment 2334 towards the circuit board 3.

[0100] also, Figure 10An exemplary structure of a second flow guide 24 is shown. The second flow guide 24 is fixedly connected to the end of the device housing 21 facing the circuit board 3 (second end 212), and the second flow guide 24 is bent so that it can also be connected to the circuit board 3. The heat dissipation efficiency of the fuse 2 can be further improved by increasing the width of the second flow guide 24. For example, the maximum dimension of the second flow guide 24 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. That is, as long as a portion of the dimension of the second flow guide 24 in the second direction is greater than or equal to the dimension of the device housing 21 in the second direction ("equal to" allows for an error of 5 mm, "greater than" means at least 5 mm more), for example, the second flow guide 24 is a metal sheet of equal width bent into shape, and the width of the second flow guide 24 in the second direction is greater than or equal to the width of the device housing 21 in the second direction. By using the above design, at least a portion of the second guide bar 24 is wider in the second direction. This allows the second guide bar 24 to have more area for heat dissipation (for example, the area of ​​the second guide bar 24 used for heat exchange with air is larger), which further improves the heat dissipation efficiency of the fuse 2 and gives the fuse 2 a greater current carrying capacity.

[0101] The second guide bar 24 can be any suitable structure, for example, refer to Figure 10 The second flow guide 24 includes a fourth part 241, a fifth part 242, and a sixth part 243. The fourth part 241 is located on the side of the device housing 21 facing the circuit board 3 and is fixedly connected to the device housing 21 (e.g., by bolts). The fourth part 241 of the second flow guide 24 is fixedly connected to the fuse 22. The fifth part 242 is fixed between the fourth part 241 and the sixth part 243. The fifth part 242 is a bent portion (e.g., the fifth part 242 is arc-shaped or angled), so that the fifth part 242 bends from the fourth part 241 toward the circuit board 3. The sixth part 243 is used to connect to the circuit board 3, or in other words, the bent fifth part 242 is connected to the circuit board 3 through the sixth part 243. After the sixth part 243 is fixed to the circuit board 3, the sixth part 243 supports the device housing 21 and creates a gap between the fourth part 241 and the circuit board 3. That is, under the support of the sixth part 243, the fourth part 241 is not connected to the circuit board 3 (including not in contact).

[0102] In some other examples, there is no need to set a sixth part 243. That is, the second guide bar 24 only includes a fixedly connected fourth part 241 and a fifth part 242, with the fifth part 242 directly fixedly connected to the circuit board 3.

[0103] exist Figure 10In the example shown, the fifth portion 242 of the second guide bar 24 is located on the side of the fourth portion 241 of the second guide bar 24 away from the third portion 233 of the first guide bar 23. Since the fifth portion 242 is fixed between the fourth portion 241 and the sixth portion 243, this can make the sixth portion 243 (or the fifth portion 242) of the second guide bar 24 and the third portion 233 of the first guide bar 23 separated by a large distance. For example, the sixth portion 243 of the second guide bar 24 and the third portion 233 of the first guide bar 23 are located on different sides of the device housing 21, which reduces the possibility of arcing or direct conduction between the first guide bar 23 and the second guide bar 24.

[0104] In some other examples, Figure 11 An exemplary diagram shows another structure of the second guide bar 24, with reference to Figure 11 In the second guide bar 24, the fifth part 242 is fixedly connected to one end of the fourth part 241 in the first direction. In this example, the first guide bar 23 bends toward the side away from the device housing 21, increasing the gap between the portion of the first guide bar 23 near the second guide bar 24 and the second guide bar 24, reducing the possibility of arcing or direct conduction between the first guide bar 23 and the second guide bar 24.

[0105] exist Figure 10 In the example shown, the fourth portion 241, the fifth portion 242, and the sixth portion 243 of the second guide strip 24 have equal dimensions in the second direction, which facilitates the production and processing of the second guide strip 24. For example, the second guide strip 24 can be formed by bending a metal sheet of equal width. Furthermore, the dimensions of the fourth portion 241, the fifth portion 242, and the sixth portion 243 in the second direction are all equal to the dimensions of the device housing 21 in the second direction. That is, the overall dimension of the second guide strip 24 in the second direction is equal to the dimension of the device housing 21 in the second direction. While increasing the size of the second guide strip 24, it does not protrude to the outside of the device housing 21 in the second direction. This is beneficial for the heat dissipation of the fuse 2, while also taking into account the volume of the fuse 2, reducing the space occupied by the fuse 2 in the internal space of the protective housing 1.

[0106] In some other examples, the fourth portion 241, the fifth portion 242, and the sixth portion 243 of the second guide strip 24 have equal dimensions in the second direction, and the dimensions of the fourth portion 241, the fifth portion 242, and the sixth portion 243 of the second guide strip 24 in the second direction are all larger than the dimensions of the device housing 21 in the second direction. In this way, the width of the second guide strip 24 in the second direction is increased, so that the second guide strip 24 can dissipate heat in more areas, further improving the heat dissipation effect of the fuse 2.

[0107] In other examples, among the fourth part 241, the fifth part 242, and the sixth part 243, only the maximum dimension of the fourth part 241 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction; or only the maximum dimension of the fifth part 242 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction; or only the maximum dimension of the sixth part 243 in the second direction is greater than or equal to the maximum dimension of the device housing 21 in the second direction. By ensuring that a portion of the second guide bar 24 has a dimension in the second direction greater than or equal to the dimension of the device housing 21 in the second direction, the heat dissipation efficiency of the fuse 2 can be improved.

[0108] In some examples, refer to Figure 10 The length of the fourth part 241 in the first direction can be extended so that the end face (end face a2) of the fourth part 241 away from the fifth part 242 is flush with the surface (b3) of the device housing 21 facing the third part 233. This can increase the heat dissipation area of ​​the second guide bar 24. While taking into account the volume of the fuse 2, the length of the fourth part 241 in the first direction is maximized, which is beneficial to the heat dissipation of the fuse 2 and also reduces the space occupied by the fuse 2 in the internal space of the power conversion device 20.

[0109] Furthermore, fuse 2 can be fixed to circuit board 3 in any suitable manner. Figure 10 In the example shown, both the first guide strip 23 and the second guide strip 24 are inserted into the circuit board 3. The end of the first guide strip 23 used for fixing to the circuit board 3 (the end of the third part 233 closest to the circuit board 3) has multiple first openings 234, making the end of the first guide strip 23 used for connecting to the circuit board 3 toothed (including multiple teeth, with one tooth formed between two adjacent first openings 234). The circuit board 3 has multiple first insertion ports 31, and the end of the first guide strip 23 used for connecting to the circuit board 3 is inserted into the first insertion port 31. For example, each tooth of the first guide strip 23 is inserted into one first insertion port 31 (after insertion, the first guide strip 23 can also be soldered to the circuit board 3 for fixation). Furthermore, the end of the second guide bar 24 used for connecting with the circuit board 3 (the end of the sixth part 243 near the circuit board 3) is also provided with multiple second openings 244, so that the end of the second guide bar 24 used for connecting with the circuit board 3 is toothed (including multiple teeth, and a tooth is formed between two adjacent second openings 244). The circuit board 3 is provided with multiple second sockets 32, and the end of the second guide bar 24 used for connecting with the circuit board 3 is inserted into the second sockets 32. For example, each tooth of the second guide bar 24 is inserted into a second socket 32 ​​(it can also be soldered after insertion).

[0110] In the power conversion device 20 of this application, the fuse 2 can be cooled by liquid cooling or by air cooling.

[0111] When the fuse 2 is cooled by liquid cooling, the power module 201 may also include a liquid cooling plate 4. Figure 12 An exemplary structure of a liquid cooling plate 4 is shown, which has cooling channels 41 for the flow of a cooling medium (water-based solution or oil-based cooling solution). The liquid cooling plate 4 can be a separate structure mounted on a protective shell 1 (see auxiliary reference for the structure of the protective shell 1). Figure 3 Inside, the liquid cooling plate 4 can also be part of the protective shell 1. For example, the part of the protective shell 1 with cooling channels 41 can be used as the liquid cooling plate 4.

[0112] At least one of the first flow guide strip 23 or the device housing 21 is connected to the liquid cooling plate 4. For example, both the first flow guide strip 23 and the device housing 21 are connected to the liquid cooling plate 4 via thermally conductive adhesive 5. Figure 12 In the illustrated example, a glue groove 42 (metal frame) is fixed on the liquid cooling plate 4. The glue groove 42 is used to contain thermally conductive adhesive 5. The thickness of the thermally conductive adhesive 5 is less than or equal to the depth of the glue groove 42. After the thermally conductive adhesive 5 is poured into the glue groove 42, it covers a portion of the device housing 21 and a portion of the first guide strip 23, allowing heat on the device housing 21 and the first guide strip 23 to be transferred to the liquid cooling plate 4 through the thermally conductive adhesive 5. In some other examples, one end of the thermally conductive adhesive 5 is connected to the circuit board 3, and the other end is connected to the liquid cooling plate 4, so that the thermally conductive adhesive 5 covers the portion of the fuse 2 between the liquid cooling plate 4 and the circuit board 3. In some other examples, the thermally conductive adhesive 5 may not be additionally provided, and the first guide strip 23 may be connected (e.g., in contact) to the liquid cooling plate 4. This also allows heat from the fuse 22 to be transferred to the liquid cooling plate 4 through the device housing 21 and the first guide strip 23. Liquid cooling is used to dissipate heat from the fuse 2. Heat exchange is carried out between the fuse 2 and the liquid cooling plate 4, which accelerates the heat dissipation of the fuse 2.

[0113] When the fuse 2 is cooled by air, the power conversion device 20 also includes a fan 6. Figure 13An exemplary structure of a fan 6 is shown. The circuit board 3 and fuse 2 are both located inside a protective housing 1. The fan 6 is fixed to the protective housing 1. For example, the protective housing 1 has an air vent 13 (including an air inlet 131 and an air outlet 132). The fan 6 is fixed at the air inlet 131 of the protective housing 1 to blow air into the protective housing 1, or the fan 6 is fixed at the air outlet 132 of the protective housing 1 to extract air from inside the protective housing 1. Both methods can serve to dissipate heat from the fuse 2. The fuse 2 can be located between the air inlet 131 and the air outlet 132, or it can be in no obvious positional relationship with either the air inlet 131 or the air outlet 132, as long as the air entering the protective housing 1 from the air inlet 131 can pass through the fuse 2 and exit from the air outlet 132.

[0114] Figure 14 An exemplary diagram illustrates the structure of the air inlet 61 (the end where the fan 6 receives air) and the air outlet 62 (the end where the fan 6 discharges air). The air inlet 61 and the air outlet 62 of the fan 6 are arranged along a second direction, so that the air inside the protective housing 1 flows as far as possible along the second direction under the action of the fan 6. For example, refer to... Figure 13 Fan 6 blows air into the protective housing 1 in the second direction at the air inlet 131, so that the air blown out by fan 6 can flow through fuse 2 in the second direction; for example, fan 6 draws the air out of the protective housing 1 in the second direction at the air outlet 132, so that the air in the protective housing 1 can flow through fuse 2 in the second direction.

[0115] In this way, under the action of fan 6, the air inside the protective shell 1 will not only blow past the periphery of the fuse 2, but also blow past the gap between the first guide strip 23 and the device shell 21, and the gap between the second guide strip 24 and the circuit board 3. This allows the device shell 21, the first guide strip 23 and the second guide strip 24 to exchange heat with the air inside the protective shell 1, making full use of the multiple surfaces of the fuse 2 for heat dissipation and improving the heat dissipation efficiency of the fuse 2.

[0116] In some other examples, the power conversion device 20 is an inverter that can convert direct current from photovoltaic modules or energy storage batteries into alternating current. In such examples, when the power conversion device 20 includes a protective housing 1, the protective housing 1 is the outer shell of the inverter, and a fan 6 may be provided on the protective housing 1, or a liquid cooling plate 4 may be provided inside the protective housing 1.

[0117] 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 power conversion device is used to convert the input electrical energy into power and output it. The power conversion device includes a circuit board and a fuse fixed on the circuit board. The fuse includes: Device housing; A first flow guide strip, comprising a first part, a second part, and a third part, wherein the first part is located on the side of the device housing facing away from the circuit board and is fixedly connected to the device housing; the second part is fixed between the first part and the third part and bends from the first part toward the circuit board; the third part is arranged with the device housing along a first direction, the first direction being parallel to the surface of the circuit board; the third part is used to connect to the circuit board; the maximum dimension of at least one of the first part, the second part, or the third part in a second direction is greater than or equal to the maximum dimension of the device housing in the second direction; the second direction is perpendicular to the first direction and parallel to the surface of the circuit board. The second guide strip is fixedly connected to one end of the device housing facing the circuit board, and the second guide strip is used to connect to the circuit board; A fuse is located inside the device housing. One end of the fuse is fixedly connected to the first part, and the other end of the fuse is fixedly connected to the second flow guide strip.

2. The power conversion device according to claim 1, characterized in that, The third part includes a first segment and a second segment that are fixedly connected. The first segment is fixedly connected to the second part, and the second segment is used to connect the circuit board. In the first direction, the second segment faces the second guide strip. The surface of the first segment facing the device housing and the surface of the second segment facing the second guide strip are both parallel to the surface of the device housing facing the first segment. In the first direction, the surface of the second segment facing the second guide strip is farther from the device housing than the surface of the first segment facing the device housing.

3. The power conversion device according to claim 2, characterized in that, The third part further includes a third segment, through which the first segment is fixedly connected to the second segment, and the third segment is inclined from the first segment to the second segment toward the surface of the device housing.

4. The power conversion device according to claim 1, characterized in that, The third part further includes a fourth segment and a fifth segment that are fixedly connected. The fourth segment is fixedly connected to the second part and is inclined away from the device housing in the direction toward the circuit board. The fifth segment is used to connect to the circuit board. In the first direction, the fifth segment faces the second guide strip, and the surface of the fifth segment facing the second guide strip is parallel to the surface of the device housing facing the fourth segment.

5. The power conversion device according to claim 1, characterized in that, The end face of the first part that is opposite to the second part is flush with the surface of the device housing that is opposite to the third part.

6. The power conversion device according to any one of claims 1-5, characterized in that, The maximum dimension of the second guide bar in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction.

7. The power conversion device according to claim 6, characterized in that, The second flow guide includes a fourth part and a fifth part. The fourth part is located on the side of the device housing facing the circuit board and is fixedly connected to the device housing. The fourth part is fixedly connected to the fuse. The fifth part is located on the side of the fourth part away from the third part. The fifth part bends from the fourth part toward the circuit board and is used to connect to the circuit board.

8. The power conversion device according to claim 7, characterized in that, The end face of the fourth part that is away from the fifth part is flush with the surface of the device housing facing the third part.

9. The power conversion device according to claim 1, characterized in that, The maximum dimensions of the device housing in the first direction and the maximum dimensions of the device housing in the second direction are both smaller than the maximum dimensions of the device housing in the direction perpendicular to the surface of the circuit board.

10. The power conversion device according to claim 1, characterized in that, The power conversion device further includes a liquid cooling plate, which has a cooling channel for the flow of cooling medium, and at least one of the first guide bar or the device housing is connected to the liquid cooling plate. Alternatively, the power conversion device may further include a protective housing and a fan, with the circuit board and the fuse both located inside the protective housing. The protective housing has a specific air vent, and the fan is fixed at the air vent of the protective housing. The air inlet and air outlet of the fan are arranged along the second direction.

11. A charging device, characterized in that, The charging device includes a cabinet, a charging connector, and a power conversion device according to any one of claims 1-10. The power conversion device is located inside the cabinet, and the charging connector is located outside the cabinet and electrically connected to the output terminal of the power conversion device. The charging connector is used to charge the device to be charged.

12. A fuse, characterized in that, include: A device housing having opposing first and second ends; A first guide strip, comprising a first part, a second part, and a third part, wherein the first part is located on the side of the device housing opposite to the second end and is fixedly connected to the first end; the second part is fixed between the first part and the third part and bends from the first part toward the second end; the third part is arranged with the device housing along a first direction; the maximum dimension of at least one of the first part, the second part, or the third part in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction; the first direction and the second direction are perpendicular to each other and both perpendicular to the arrangement direction of the first end and the second end; The second guide strip is fixedly connected to the second end of the device housing; A fuse is located inside the device housing. One end of the fuse is fixedly connected to the first part, and the other end of the fuse is fixedly connected to the second flow guide strip.

13. The fuse according to claim 12, characterized in that, The maximum dimension of the second guide bar in the second direction is greater than or equal to the maximum dimension of the device housing in the second direction.

Images