Switching device and power device

Abstract

The embodiment of the present application provides a kind of switch device and power equipment, it is related to power distribution technical field, for solving the problem that pyrotechnic switch device structure is complex, manufacturing cost is higher and assembly process is complex.Switch device includes first shell and second shell, first shell is used to accommodate ignition device, piston and through-flow row in.The piston is used to cut off through-flow row along the thickness direction of through-flow row.Second shell is installed on the outer wall of first shell.Second shell is used to accommodate fuse in.A conducting connector is fixed to a part of through-flow row.Another conducting connector is fixed to another part of through-flow row.The part of through-flow row corresponding to piston along the thickness direction of through-flow row is located between the part of through-flow row and another part of through-flow row.The one end of each conducting connector is connected with fuse through first shell and second shell.The switch device is simple in structure, low in manufacturing cost and convenient for selecting different specifications of fuse according to different current levels.

Description

Technical Field

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

[0002] To prevent equipment malfunctions or even safety issues caused by abnormal current, circuit breakers are typically used to disconnect the circuit in which they operate. Among these, pyrotechnic circuit breakers utilize the energy generated by the explosion of an ignition device to forcibly break the circuit. They have attracted widespread attention due to their strong breaking capacity, fast response speed, and high safety and reliability.

[0003] In some circuit breaking schemes, fuses are connected in parallel between the inlet and outlet terminals of the current-carrying busbar in a pyrotechnic circuit breaker to help extinguish the arc and ensure that the circuit can be reliably and safely disconnected. Typically, the fuse is integrated below the break point of the current-carrying busbar in the pyrotechnic circuit breaker, resulting in a complex overall structure, high manufacturing cost, and complex assembly process. Utility Model Content

[0004] This application provides a switching device and a power device to simplify the structure of the switching device, reduce manufacturing costs, and simplify assembly processes.

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

[0006] A first aspect of this application provides a switching device. The switching device includes a first housing and a second housing. The first housing houses an igniter, a piston, and a flow channel, the piston being used to cut off the flow channel along its thickness direction. The second housing is mounted on the outer wall of the first housing. The second housing houses a fuse. A conductive connector is fixed to a portion of the flow channel. Another conductive connector is fixed to another portion of the flow channel. A portion of the flow channel corresponding to the piston along its thickness direction is located between the first and second portions of the flow channel. One end of each conductive connector passes through the first and second housings and connects to the fuse.

[0007] The switching device disclosed in this application is a pyrotechnic switching device. In this pyrotechnic device, the fuse is integrated into the outer wall of the first housing, and the fuse is connected in parallel to the two ends of the current busbar through two conductive connectors. Compared with the fuse being integrated into the first housing, the structure of the entire switching device is simpler. In the production and assembly processes, the first housing and its internal structure, and the second housing and its internal structure can be manufactured and assembled separately, and then the two can be assembled together, reducing the manufacturing cost of the entire switching device and simplifying the assembly process.

[0008] The switching device provided in this application also allows for easy selection of fuses of different specifications according to different current levels, offering high flexibility and a wider range of applications.

[0009] In one embodiment, the second housing is used to accommodate a circuit board, and a fuse, a conductive connector, and another conductive connector are all connected to the circuit board. The fuse is electrically connected to the conductive connector and the other conductive connector through internal wiring of the circuit board.

[0010] In the switching device provided in this application, fixing the fuse, one conductive connector and another conductive connector on the circuit board makes the structure of the switching device more compact and small, and the connection between the fuse and the conductive connector has higher reliability and stability.

[0011] In addition, the soldering of circuit boards, fuses, and conductive connectors can be completed quickly and automatically using specialized equipment such as chip mounters, resulting in high production efficiency, low cost, and ease of mass production and automation.

[0012] In one embodiment, the circuit board includes a plurality of conductive vias, each conductive via penetrating the circuit board along the thickness direction, and the inner wall of each conductive via extending to one side along the thickness direction of the circuit board to form a pad.

[0013] A conductive connector passes through one of a plurality of conductive vias and is connected to a pad of that conductive via. Another conductive connector passes through another of the plurality of conductive vias and is connected to a pad of that other conductive via. The fuse includes at least two terminals, each terminal passing through a different additional conductive via and connected to a corresponding pad of that additional conductive via.

[0014] Along the thickness direction of the circuit board, the pads of one conductive via and another conductive via are located on one side of the circuit board, and the pad of another conductive via is located on the other side of the circuit board.

[0015] In the switching device provided in this application, the fuse is inserted into the corresponding conductive through hole along one side of the circuit board, and the wiring terminals of the fuse and the pads of the corresponding conductive through hole are connected on the other side of the circuit board. Then the circuit board is fixed in the second housing, so that one conductive connector and another conductive connector are respectively inserted into the corresponding conductive through hole along the other side of the circuit board, and the conductive through hole and the corresponding conductive connector are connected on one side of the circuit board, so as to realize the assembly between modules, which is convenient for operation and helps to improve the assembly efficiency of the switching device.

[0016] In one embodiment, the fuse includes a plurality of fuses connected in series, wherein the plurality of fuses are arranged at intervals along the thickness direction and width direction of the flow channel.

[0017] In the switching device provided in this application, since the breaking capacity of a single fuse is limited, connecting multiple fuses in series is beneficial to improving the breaking capacity of the switching device. While meeting the same breaking capacity, a single fuse has a large volume, but arranging multiple fuses at intervals optimizes the spatial layout and reduces the floor space required.

[0018] In some embodiments, multiple fuses are identical to facilitate mass production and control, and to reduce maintenance costs.

[0019] In one embodiment, the second housing is filled with insulating potting compound, which covers the portion of the fuse and each conductive connector that extends into the second housing.

[0020] In the switching device provided in this application, by filling the second housing with insulating potting compound, it serves two purposes: firstly, it fixes the structure inside the second housing and provides insulation between the structures inside the second housing; secondly, it provides vibration damping, preventing the connection between the fuse and the conductive connector from loosening due to vibration and impact, thus ensuring the safety and reliability of the entire switching device.

[0021] In one embodiment, the side of the first housing facing the second housing includes a first protrusion, and the outer peripheral surface of the first protrusion includes a groove that is recessed inward from the outer peripheral surface of the first protrusion. A sidewall of the second housing facing the first housing includes a first through-hole that penetrates the sidewall along its thickness direction. One end of the first protrusion extends into the second housing through the first through-hole, and the groove is at least partially located within the second housing. Insulating potting compound is used to fill the groove.

[0022] In the switching device provided in this application, the insulating potting compound in the groove is cured and then used to connect the first housing and the second housing. The combination of the first protrusion and the insulating potting compound improves the connection reliability between the first and second housings, reducing the possibility of loosening at the connection point. Furthermore, it reduces the number of fasteners used to connect the first and second housings, thereby reducing the number of holes on the first housing and improving the overall structural rigidity of the first housing.

[0023] In one embodiment, the first housing includes two first sidewalls and two second sidewalls. The two first sidewalls are arranged opposite to each other along the thickness direction of the flow channel, and the two second sidewalls are arranged opposite to each other along the length direction of the flow channel. An igniter and a piston are located between one of the first sidewalls and the flow channel. Both ends of the flow channel pass through the corresponding second sidewalls to form connecting ends. The distance between one connecting end of the flow channel and one first sidewall is smaller than the distance between the other connecting end of the flow channel and one first sidewall. The second housing is located on the second sidewall on the side where one connecting end of the flow channel is located, and the distance between the fuse and one first sidewall is greater than the distance between the flow channel and one first sidewall.

[0024] In the switching device provided in this application, the second housing is installed on the second side wall on the side where one connection end of the flow path is located, and the distance between the fuse and a first side wall is greater than the distance between the flow path and a first side wall. While ensuring that the structure of the entire fuse is compact and occupies little space, the fuse is located on the side of the flow path away from the ignition device and piston, reducing mutual interference between the fuse and the ignition device, piston and other structures, and ensuring the safety of the entire switching device.

[0025] In some embodiments, one connection terminal is the input terminal of the busbar, and the other connection terminal is the output terminal of the busbar. By placing the fuse close to the input terminal of the busbar, the length of the conductive connection between a portion of the busbar and the fuse is reduced, unnecessary resistance and inductance are decreased, which facilitates rapid circuit disconnection.

[0026] In one embodiment, a portion of the flow channel includes a first segment, a second segment, and a third segment, the first segment and the third segment being connected to different sides of the second segment along the length direction of the flow channel. The second segment includes a second through hole that extends through the second segment along the length direction of the flow channel. A portion of a first housing is accommodated within the second through hole, and the portion of the first housing includes a mounting hole that extends along the length direction of the flow channel. One end of a fastener passes through the second housing, extends into the mounting hole, and connects to the inner wall of the mounting hole.

[0027] In the switching device provided in this application, since the conductive connector passes through the first housing and the second housing to connect the fuse, in order to prevent the conductive connector from falling off the fuse, a fastener is connected to a part of the first housing inside the second through hole of the second section. On the one hand, the first housing and the second housing are connected by a fastener, and on the other hand, the busbar and the first housing are connected while ensuring insulation, so as to ensure the stability of the connection between the conductive connector and the fuse under external force impact such as vibration.

[0028] In one embodiment, one end of a portion of the flow channel passes through the first housing and the second housing to form a first connection end. A conductive connector is fixed to one side of the portion of the flow channel along the thickness direction of the flow channel, and another portion of the conductive connector is located on one side of the portion of the flow channel along the width direction of the flow channel. One end of the conductive connector is used to connect a fuse.

[0029] In the switching device provided in this application, by placing a conductive connector on one side of a portion of the flow path along the width direction of the flow path, the space occupied by the conductive connector in the switching device along the thickness direction of the flow path is reduced.

[0030] In one embodiment, one end of another portion of the flow channel passes through the first housing to form a second connection end. Another conductive connector is fixed to one side of the other portion of the flow channel along the thickness direction of the flow channel, and a portion of the other conductive connector is located on the other side of the other portion of the flow channel along the width direction of the flow channel. One end of the portion of the other conductive connector is used to connect a fuse.

[0031] In the switching device provided in this application, by placing another conductive connector on the other side of a portion of the flow path along the width direction of the flow path, the space occupied by the other conductive connector in the switching device along the thickness direction of the flow path is reduced.

[0032] In one embodiment, a portion of the flow channel is used to fix an insulating plate on the other side along the thickness direction of the flow channel, and an insulating sleeve is covered on the outer periphery of a portion of another conductive connector, the insulating sleeve being mounted on the insulating plate.

[0033] In the switching device provided in this application, since another part of the current bus is farther away from the second housing than a part of the current bus, the length of the other conductive connector is greater than the length of the first conductive connector. The insulation performance of the other conductive connector, the part of the current bus, and the first conductive connector is increased by covering the outer periphery of a part of the other conductive connector with an insulating sleeve.

[0034] The insulating sleeve is installed on the insulating plate and also supports another conductive connector, preventing the other conductive connector from breaking.

[0035] In one embodiment, a portion of an insulating plate is located on one side of a portion of another conductive connector along the thickness direction of a flow path. The portion of the insulating plate includes a third through-hole that extends through the portion of the insulating plate along the thickness direction of the flow path. An insulating sleeve on the side facing the portion of the insulating plate includes a plurality of second protrusions, each second protrusion passing through a different third through-hole in the insulating plate. A gap exists between the insulating sleeve and the portion of the insulating plate.

[0036] In the switching device provided in this application, the insulating sleeve is positioned on the insulating plate by inserting a second protrusion into a third through hole, thereby providing support for the insulating sleeve. A gap exists between the insulating sleeve and a portion of the insulating plate, which can be used for heat insulation.

[0037] In some embodiments, the flow channel is integrally injection molded with a portion of the first housing, and the gap between the insulating sleeve and the insulating plate can be used to fill the injection molding material to improve the support for another conductive connector.

[0038] A second aspect of this application provides a power device, which includes a power source and the aforementioned switching device, wherein the power source supplies power to the ignition device of the switching device.

[0039] The power supply provides power to the ignition device, causing it to explode. The impact force generated by the explosion drives a piston to cut off the flow path, thereby disconnecting the circuit containing the flow path and ensuring circuit safety through rapid circuit interruption.

[0040] The power device provided in this application includes the aforementioned switching device. Therefore, the power device provided in this application and the switching device of the aforementioned technical solution can solve the same technical problem and have the same technical effect, which will not be repeated here. Attached Figure Description

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

[0042] Figure 2 One of the schematic diagrams of a power device provided in the embodiments of this application;

[0043] Figure 3 This is a second schematic diagram of a power device provided in an embodiment of this application;

[0044] Figure 4 This is a third schematic diagram of a power device provided in an embodiment of this application;

[0045] Figure 5 This is a fourth schematic diagram of a power device provided in an embodiment of this application;

[0046] Figure 6 This is a three-dimensional structural diagram of a switching device provided in an embodiment of this application;

[0047] Figure 7A One of the partial cross-sectional views of a switching device provided in the embodiments of this application;

[0048] Figure 7B A second partial cross-sectional view of a switching device provided in an embodiment of this application;

[0049] Figure 8 This is one of the partial structural schematic diagrams of a switching device provided in an embodiment of this application;

[0050] Figure 9 for Figure 8 A partial exploded view of the switching device in the diagram;

[0051] Figure 10A This is a second partial structural schematic diagram of a switching device provided in an embodiment of this application;

[0052] Figure 10B This is the third partial structural schematic diagram of a switching device provided in the embodiments of this application;

[0053] Figure 11 for Figure 10B Exploded view of the switching device in the diagram.

[0054] Figure label:

[0055] 100 - Power equipment; 10 - Switching device; 20 - Controller; 30 - Power supply;

[0056] 1-First outer casing; 11-First sidewall; 111-First sidewall a; 112-Second sidewall b; 12-Second sidewall; 121-Second sidewall a; 122-Second sidewall b; 13-Third sidewall; 124-Mounting hole; 125-First protrusion; 1251-Groove;

[0057] 2-Second outer shell; 21-Shell shell; 211-First hole; 212-Second hole; 213-First through hole; 214-Positioning protrusion; 215-Pressure plate; 22-Shell cover; 221-Glue inlet;

[0058] 3-Fuse; 31-Terminal block;

[0059] 4-Circuit board; 41-Conductive via; 411-First conductive via; 412-Second conductive via; 413-Third conductive via; 42-Pad; 43-Positioning hole;

[0060] 5-Insulating potting compound;

[0061] 6-Fastener; 61-First fastener; 62-Second fastener;

[0062] 01-igniter;

[0063] 02-Piston;

[0064] 03-Flow channel; 031-Connecting end; 0311-First connecting end; 0312-Second connecting end; 032-First section; 033-Second section; 034-Third section; 035-Second through hole; 036-First riveting protrusion; 037-Second riveting protrusion; 038-Third riveting protrusion;

[0065] 04-Conductive connector; 041-First conductive connector; 0411-First riveting groove; 042-Second conductive connector; 0421-Second riveting groove;

[0066] 05-Insulating board; 051-Third through hole; 052-Third riveting groove;

[0067] 06-Insulating sleeve; 061-Second protrusion;

[0068] 07-Insulating plastic parts. Detailed Implementation

[0069] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0070] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0071] Figure 1 A schematic diagram of a power device provided in this application. (Refer to...) Figure 1 The power device 100 includes a power supply 30 and a switching device 10, which is used to connect with a load or other device or equipment to form a circuit. The power supply 30 supplies power to the ignition device of the switching device 10 so that the ignition device explodes, thereby causing the switching device 10 to disconnect the circuit when an abnormality occurs in the circuit.

[0072] In some embodiments, the power device 100 of this application includes a high-voltage circuit, and the switching device 10 is applied in the high-voltage circuit. The power supply 30 includes a high-voltage power supply, and one end of the switching device 10 is connected to the high-voltage power supply, and the other end is connected to the load.

[0073] In other embodiments, the power device 100 of this application includes a low-voltage circuit, in which the switching device 10 is applied. The power supply 30 includes a low-voltage power supply, and one end of the switching device 10 is connected to the low-voltage power supply, while the other end is connected to the load.

[0074] The power equipment 100 provided in this application includes at least one of photovoltaic inverters, energy storage systems, electric vehicles, and power distribution equipment. Figures 2 to 5 Four structural schematic diagrams of power devices are shown.

[0075] Figure 2 One of the schematic diagrams of a power device provided in this application. (Refer to...) Figure 2 The power device 100 includes a photovoltaic inverter, one end of which is connected to a photovoltaic module, and the other end is connected to an AC load or an AC power grid. The photovoltaic module is used to convert solar energy into electrical energy. The photovoltaic inverter is used to convert the direct current (DC) generated by the photovoltaic module into alternating current (AC) and supply power to the AC load or AC power grid.

[0076] The photovoltaic inverter includes a maximum power point tracking (MPPT) circuit and a direct current to alternating current (DC / AC) converter. One end of the MPPT circuit is connected to the photovoltaic module, and the other end is connected to the DC / AC converter. The MPPT circuit tracks the highest voltage and current values ​​to achieve maximum power output current.

[0077] One end of the DC / AC converter connects to the MPPT circuit and energy storage system, while the other end connects to the AC power grid or AC load. The DC / AC converter converts the DC power output from the MPPT circuit or energy storage system into AC power and supplies it to the AC load or AC power grid.

[0078] In some embodiments, the switching device 10 is connected in the DC circuit between the MPPT circuit device and the DC / AC converter, and the switching device 10 is used to disconnect the electrical connection between the MPPT circuit device and the DC / AC converter.

[0079] In some embodiments, the switching device 10 is connected in the DC circuit between the energy storage system and the DC / AC converter, and the switching device 10 is used to disconnect the electrical connection between the energy storage system and the DC / AC converter.

[0080] In some embodiments, the switching device 10 is connected in the DC circuit between the MPPT circuit device and the energy storage system and the DC / AC converter, and the switching device 10 is used to disconnect the electrical connection between the MPPT circuit device and the energy storage system and the DC / AC converter.

[0081] In some embodiments, the switching device 10 is connected in the AC circuit between the output terminal of the DC / AC converter and the photovoltaic inverter. The switching device 10 is used to disconnect the electrical connection between the DC / AC converter and the AC load, or between the DC / AC converter and the AC power grid.

[0082] Figure 3 This is a second schematic diagram of a power device provided in this application. (Refer to...) Figure 3 The power device 100 includes an energy storage system. The energy storage system includes one or more battery clusters, each battery cluster including one or more battery packs. A photovoltaic inverter system is used to supply power to the battery clusters, which in turn supply power to the load.

[0083] In some embodiments, the switching device 10 is connected in a DC circuit between the battery pack and the load, and the switching device 10 is used to disconnect the electrical connection between the battery pack and the load.

[0084] In some embodiments, the switching device 10 is connected in the DC circuit between the photovoltaic inverter system and the battery cluster, and the switching device 10 is used to disconnect the electrical connection between the battery cluster and the photovoltaic inverter system.

[0085] Figure 4 This is the third schematic diagram of a power device provided in this application. (Refer to...) Figure 4The power device 100 includes an electric vehicle, which includes a power battery and an electric drive system. The power battery includes a battery cluster, which includes one or more battery packs connected in series. The electric drive system includes an inverter circuit and a motor. The battery cluster provides direct current (DC) power to the inverter circuit, which converts the DC power into alternating current (AC) power and supplies it to the motor, thereby driving the motor to rotate.

[0086] In some embodiments, refer to Figure 4 The switching device 10 is connected in the DC circuit between the battery pack and the inverter circuit. The switching device 10 is used to disconnect the electrical connection between the battery pack and the electric drive system.

[0087] In some embodiments, the switching device 10 is connected in the AC circuit between the inverter circuit and the motor. The switching device 10 is used to disconnect the electrical connection between the inverter circuit and the motor.

[0088] Figure 5 This is the fourth schematic diagram of a power device provided in this application. (Refer to...) Figure 5 The power device 100 includes a power distribution device electrically connected between the power grid and the load. The power distribution device includes an alternating current to direct current (AC / DC) converter and a switching device 10. The AC / DC converter converts alternating current from the power grid into direct current. The switching device 10 is connected in the DC circuit between the AC / DC converter and the load; that is, the power grid, the load, the AC / DC converter, and the switching device 10 are connected to form a power loop. The switching device 10 is used to disconnect or connect the electrical connection between the AC / DC converter and the load.

[0089] In some embodiments, the power distribution equipment includes high-voltage switchgear, generators, transformers, power lines, circuit breakers, low-voltage switchgear, distribution panels, switch boxes, control boxes, and other equipment.

[0090] The power device 100 provided in this application may take many forms, and this application does not impose any limitation on it. Below, this application will take an electric vehicle as an example of the power device 100 and, in conjunction with the accompanying drawings, provide a more detailed description of the structure of the switching device 10.

[0091] Figure 6 This is a three-dimensional structural diagram of a switching device provided in an embodiment of this application. Figure 7A This is one of the partial cross-sectional views of a switching device provided in an embodiment of this application. (Refer to...) Figure 6 and Figure 7AThe switching device 10 includes a first housing 1, an ignition device 01, a piston 02, and a flow channel 03. The first housing 1 houses the ignition device 01, piston 02, and flow channel 03. The two ends of the flow channel 03 are connected to corresponding circuits. The piston 02, driven by the impact force generated when the ignition device 01 explodes, cuts off the flow channel 03 along its thickness direction, thereby disconnecting the circuit containing the flow channel 03, achieving rapid circuit disconnection and ensuring circuit safety. The thickness direction of the flow channel 03 is as follows... Figure 6 and Figure 7A As shown in the X direction.

[0092] The protection action of the switching device 10, which uses the energy generated by the explosion of the ignition device 01 to drive the current-passing busbar 03 to disconnect, is fast, capable of active and passive protection across the entire current range, and provides I during disconnection. 2 The smaller T value significantly improves circuit safety. Among these, I... 2 T is used to reflect the heat generated by the current in the switching device 10, where I is the current (A) and T is the time (S).

[0093] In some embodiments, the switching device 10 includes a controller 20 and a detection unit. The detection unit is used to detect parameters such as current and voltage of the current busbar 03 and send the detection results to the controller 20 as a signal. When the detection unit detects a short circuit fault or other conditions that require disconnecting the circuit where the current busbar 03 is located, the controller 20 is used to trigger the ignition device 01 to explode.

[0094] The controller 20 can take many forms. In some embodiments, the controller 20 is a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a microprocessor, etc. This application does not impose any special limitation on the form of the controller.

[0095] In some embodiments provided in this application, the controller 20 is integrated into the switching device 10. (Refer to...) Figure 7A The first housing 1 is used to house the controller 20, and the controller 20 and the ignition device 01 are separated by a partition. By integrating the controller 20 onto the switching device 10, the signal transmission path between the controller 20 and the ignition device 01 is reduced, which facilitates rapid circuit disconnection, improves integration, saves installation space, and is suitable for scenarios with limited installation space.

[0096] In other embodiments of this application, the controller 20 and the switching device 10 are designed separately.

[0097] Reference Figure 7A To facilitate rapid disconnection of the flow channel 03, the portion of the flow channel 03 corresponding to the piston 02 along its thickness direction is designed with weakening features, such as V-grooves, thinning, and breaks, to ensure rapid breakage of the flow channel 03 and thus quickly disconnect the circuit. The portion of the flow channel 03 corresponding to the piston 02 along its thickness direction is designed with weakening features, such as V-grooves, thinning, and breaks, to facilitate rapid breakage of the flow channel 03 and thus quickly disconnect the circuit. Figure 7A As shown in the dashed box A, for ease of description, the part of the flow channel 03 that corresponds to the piston 02 along the thickness direction of the flow channel 03 is referred to as part A below.

[0098] Since the ignition device 01 of the switching device 10 is triggered by the controller 20, there is a risk that the switching device 10 may misjudge and cause the ignition device 01 to explode under the influence of electromagnetic interference, component failure, or other factors. Furthermore, when the fault current exceeds the limit of the switching device 10, the arc energy generated by the fault current exceeds the arc-extinguishing capacity of the switching device 10 itself, and the switching device 10 cannot extinguish the large arc generated by the fault current. To prevent circuit interruption due to misjudgment by the switching device 10 and to prevent the switching device 10 from failing to extinguish the arc due to excessive fault current, a fuse 3 is connected in parallel across the current busbar 03.

[0099] In the event of a malfunction of the switch 10 and the interruption of the current busbar 03, the current will be transferred to the parallel-connected fuse 3. If the current does not reach the fusing threshold of fuse 3, fuse 3 will not blow, and the circuit will operate normally. If the current reaches the fusing threshold of fuse 3, fuse 3 will blow, and the circuit will be interrupted.

[0100] In the event that the fault current is too large and the switching device 10 is unable to extinguish the arc, the fuse 3 blows before the switching device 10 breaks. After the fuse 3 blows, the arc generated by the fault current is extinguished by the arc-extinguishing medium such as quartz sand inside it, which reduces the breaking burden of the switching device 10 and protects the switching device 10 from damage.

[0101] Since the existing fuse 3 is usually integrated inside the switch device 10 and located below the break of the fuse 3, the internal structure of the switch device is complex and inconvenient to manufacture and assemble.

[0102] In order to solve the problems of complex overall structure and high manufacturing cost of switch device 10, this application modularly integrates fuse 3 and switch device 10, so that fuse 3 is integrated into the outer wall of the first housing 1, and fuse 3 is connected in parallel at both ends of busbar 03 through two conductive connectors 04.

[0103] Reference Figure 6 and Figure 7AThe second housing 2 is installed on the outer wall of the first housing 1, and the fuse 3 is housed inside the second housing 2. A conductive connector 04 is fixed to a portion of the flow channel 03, and another conductive connector 04 is fixed to another portion of the flow channel 03. A portion of the flow channel 03 is as follows: Figure 7A As shown in the dashed box B, another part of the flow channel 03 is as follows: Figure 7A As shown in the dashed box C. For ease of description and distinction, part of the flow channel 03 will be referred to as part B, and the other part of the flow channel 03 will be referred to as part C.

[0104] Part A is located between Part B and Part C. One end of each conductive connector 04 passes through the first housing 1 and the second housing 2 to connect to the fuse 3, so that one conductive connector 04 and another conductive connector 04 are connected in parallel at both ends of the predetermined break area of ​​the flow channel 03.

[0105] By mounting the second housing 2, which houses the fuse 3, on the outside of the first housing 1, and connecting them in parallel at both ends of the break of the current-carrying busbar 03 via two conductive connectors 04, the entire switching device 10 isolates the first housing 1 and its internal structures such as the igniter 01 and piston 02 from the second housing 2 and its internal fuse 3. This ensures the independence and stability of each function. The modular integrated structure is compact and small in size, making it suitable for applications with limited installation space. During the production and assembly processes, the first housing 1 and its internal structure, as well as the second housing 2 and its internal structure, can be manufactured and assembled separately before being assembled together, reducing the overall manufacturing cost and assembly steps of the switching device 10.

[0106] In practical applications, this application also facilitates the selection of fuses of different specifications 3 according to different current levels, which is highly flexible and has a wider range of applications.

[0107] In the embodiments provided in this application, both the first outer shell 1 and the second outer shell 2 are insulating shells.

[0108] Reference Figure 7A The first outer casing 1 includes two first sidewalls 11 and two second sidewalls 12. The two first sidewalls 11 are arranged opposite to each other along the thickness direction of the flow channel 03, and the two second sidewalls 12 are arranged opposite to each other along the length direction of the flow channel 03. The two first sidewalls 11 include a first sidewall a111 and a first sidewall b112. The two second sidewalls 12 include a second sidewall a121 and a second sidewall b122. The length direction of the flow channel 03 is as follows... Figure 7A Shown in the Y direction.

[0109] In some embodiments, the igniter 01 and the piston 02 are located between one of the two first sidewalls 11 and the flow channel 03. The two ends of the flow channel 03 pass through corresponding second sidewalls 12 to form connecting ends 031, and the distance between one connecting end 031 of the flow channel 03 and one first sidewall 11 is smaller than the distance between the other connecting end 031 of the flow channel 03 and one first sidewall 11. The second housing 2 is located on the second sidewall 12 on the side where one connecting end 031 of the flow channel 03 is located.

[0110] Reference Figure 7A The ignition device 01 and piston 02 are located between the first sidewall a111 and the flow channel 03. One end of the flow channel 03 passes through the second sidewall a121 to form a first connecting end 0311, and the other end of the flow channel 03 passes through the second sidewall b122 to form a second connecting end 0312. The distance between the first connecting end 0311 and the first sidewall a111 is smaller than the distance between the second connecting end 0312 and the first sidewall a111. The second housing 2 is located on the second sidewall a121, and the distance between the fuse 3 and the first sidewall a111 is greater than the distance between the flow channel 03 and the first sidewall a111.

[0111] The second housing 2 and the fuse 3 inside the second housing 2 are installed on the second side wall a121. While ensuring that the structure of the fuse 3 is compact and occupies little space, the fuse 3 is located on the side of the flow channel 03 away from the ignition device 01 and piston 02, which reduces the mutual interference between the fuse 3 and the ignition device 01, piston 02 and other structures, and ensures the safety of the entire switching device 10.

[0112] In some embodiments, the controller 20 is located between the first sidewall a111 and the ignition device 01, the second housing 2 is mounted on the second sidewall 12, and the fuse 3 is positioned away from the controller 20, thereby reducing mutual interference between the fuse 3 and the controller 20 and improving safety, thus enhancing the overall safety of the switching device 10.

[0113] In some embodiments, the first connection terminal 0311 is the input terminal of the current bus 03, and the second connection terminal 0312 is the output terminal of the current bus 03. By placing the fuse 3 close to the input terminal of the current bus 03, the length of the conductive connector 04 between part B and the fuse 3 is reduced, unnecessary resistance and inductance are reduced, which is beneficial for rapid circuit disconnection.

[0114] In other embodiments of this application, the second housing 2 may be mounted on other sidewalls. In some embodiments, the second housing 2 is disposed on the second sidewall b122. In other embodiments, the second housing 2 is disposed on a third sidewall 13 of the first housing 1, the third sidewall 13 of the first housing 1 being a sidewall of the first housing 1 along the width direction of the flow channel 03. The width direction of the flow channel 03 is as follows: Figure 6As shown in the Z-direction. Those skilled in the art can selectively design the position of the second housing 2 according to actual needs to adapt to different installation scenarios.

[0115] In some embodiments, one end of the flow channel 03 passes through the first housing 1 and the second housing 2 in sequence to form a first connection end 0311, so as to improve the structural compactness.

[0116] In some embodiments, refer to Figure 7A The second outer casing 2 is connected to the second sidewall a121 of the first outer casing 1 via fastener 6, facing one sidewall of the first outer casing 1. The second outer casing 2 facing one sidewall of the first outer casing 1 is as follows: Figure 7A As shown in Figure D, for ease of description and distinction, the sidewall shown in Figure D will be referred to as sidewall D in the following text.

[0117] Fastener 6 includes a first fastener 61 and a second fastener 62, which pass through the side wall D and are connected to the first housing 1. To facilitate the passage of the first fastener 61 and the second fastener 62, a first hole 211 and a second hole 212 are provided on the side wall D. The first fastener 61 passes through the first hole 211 and is connected to the first housing 1, and the second fastener 62 passes through the second hole 212 and is connected to the first housing 1.

[0118] Reference Figure 7A The B portion of the flow channel 03 includes a first segment 032, a second segment 033, and a third segment 034. The first segment 032 and the third segment 034 are connected to different sides of the second segment 033 along the length direction of the flow channel 03. The second segment 033 includes a second through hole 035, which penetrates the second segment 033 along the length direction of the flow channel 03.

[0119] In some embodiments, a portion of the first housing 1 is housed within the second through hole 035. The portion of the first housing 1 includes a mounting hole 124 that extends along the length of the flow channel 03. One end of the first fastener 61 passes through the second housing 2, extends into the mounting hole 124, and connects to the inner wall of the mounting hole 124.

[0120] Since both conductive connector 04 and the other conductive connector 04 pass through the first housing 1 and the second housing 2 to connect to the circuit board 4, in order to prevent the conductive connector 04 and the other conductive connector 04 from detaching from the circuit board 4, the first fastener 61 is connected to a part of the first housing 1 inside the second through hole 035 of the flow channel 03. On the one hand, the first housing 1 and the second housing 2 are connected by the first fastener 61, and on the other hand, the flow channel 03 and the first housing 21 are connected while ensuring insulation, so as to ensure the stability of the connection between the conductive connector 04 and the circuit board 4 under external force impact such as vibration.

[0121] In some embodiments, the second housing 2 is filled with insulating potting compound 5, which covers the portion of the fuse 3 and each conductive connector 04 that extends into the second housing 2. By filling the second housing 2 with insulating potting compound 5, it serves two purposes: firstly, it secures the structure within the second housing 2 and provides insulation; secondly, it dampens vibrations, preventing the connection between the fuse 3 and the conductive connector 04 from loosening due to vibration and impact, thus ensuring the safety and reliability of the entire switching device 10.

[0122] The insulating potting compound 5 can take many forms. In some embodiments, the insulating potting compound 5 is an epoxy resin potting compound, an organosilicon rubber potting compound, a polyurethane potting compound, etc. This application does not limit the specific form of the insulating potting compound 5.

[0123] In some embodiments, the second housing 2 includes a housing 21 and a cover 22. The cover 22 is disposed on the housing 21 and has a potting port 221 through which insulating potting compound 5 is injected into the housing 21.

[0124] There are various ways to connect the cover 22 and the housing 21. In some embodiments, the cover 22 and the housing 21 are connected by a snap-fit, with the cover 22 having a snap-fit ​​and the housing 21 having a slot. In other embodiments, the cover 22 and the housing 21 are connected by a fastener 6. This application does not limit the connection method of the cover 22 and the housing 21.

[0125] Reference Figure 7A The first hole 211 and the second hole 212 are arranged at intervals along the thickness direction of the flow channel 03.

[0126] To further improve the connection reliability of the first outer shell 1 and the second outer shell 2 Figure 7B This is a second partial cross-sectional view of a switching device provided in an embodiment of this application. (Refer to...) Figure 7B The second sidewall a112 of the first outer casing 1 includes a first protrusion 125, and the outer peripheral surface of the first protrusion 125 includes a groove 1251, which is radially recessed inward from the outer peripheral surface of the first protrusion 125. The sidewall D of the second outer casing 2 includes a first through hole 213, which penetrates the sidewall D along the thickness direction of the sidewall D.

[0127] One end of the first protrusion 125 extends through the first through hole 213 into the second outer shell 2. The groove 1251 is at least partially located inside the second outer shell 2. Insulating potting compound 5 is used to fill the groove 1251. After the insulating potting compound 5 in the groove 1251 cures, it connects the first outer shell 1 and the second outer shell 2. By cooperating with the first protrusion 125 and the insulating potting compound 5, the connection reliability of the first outer shell 1 and the second outer shell 2 is improved, reducing the possibility of loosening at the connection point. On the other hand, the number of fasteners 6 used to connect the first outer shell 1 and the second outer shell 2 is reduced, thereby reducing the number of holes on the first outer shell 1 and improving the overall structural rigidity of the first outer shell 1.

[0128] The number of first protrusions 125 varies. In some embodiments, there is one first protrusion 125, while in other embodiments, there are multiple first protrusions 125 spaced apart. Those skilled in the art can selectively design according to actual needs.

[0129] Figure 8 This is a partial structural schematic diagram of a switching device provided in an embodiment of this application. (Refer to...) Figure 7A and Figure 8 The second housing 2 is used to accommodate the circuit board 4. A fuse 3, one conductive connector 04, and another conductive connector 04 are all connected to the circuit board 4. The fuse 3 is electrically connected to one conductive connector 04 and the other conductive connector 04 through the internal wiring of the circuit board 4. The internal wiring of the circuit board 4 is not shown in the accompanying drawings of this application.

[0130] For ease of distinction and description, one conductive connector 04 will be referred to as the first conductive connector 041, and the other conductive connector 04 will be referred to as the second conductive connector 042.

[0131] Fixing the fuse 3, the first conductive connector 041, and the second conductive connector 042 onto the circuit board 4 makes the structure of the switching device 10 more compact and small. Furthermore, the circuit board 4 electrically connects the fuse 3 to the two conductive connectors 04, resulting in higher reliability and stability of the connection between the fuse 3 and the conductive connectors 04.

[0132] In addition, the soldering of circuit board 4, fuse 3, and conductive connector 04 can be completed quickly and automatically using special equipment such as a chip mounter, which is efficient, low-cost, and facilitates mass production and automation.

[0133] Figure 9 for Figure 8 A partial exploded view of the switching device. (Refer to...) Figure 9The circuit board 4 includes a plurality of conductive vias 41, each conductive via 41 penetrating the circuit board 4 along the thickness direction of the circuit board 4, and the inner wall of each conductive via 41 extends along one side of the thickness direction of the circuit board 4 to form a pad 42.

[0134] The plurality of conductive vias 41 include a first conductive via 411, a second conductive via 412, and a plurality of third conductive vias 413. A first conductive connector 041 passes through the first conductive via 411 and is connected to the pad 42 of the first conductive via 411 to realize the electrical connection between the first conductive connector 041 and the circuit board 4.

[0135] The second conductive connector 042 passes through the second conductive through hole 412 and is connected to the pad 42 of the second conductive through hole 412 to realize the electrical connection between the second conductive connector 042 and the circuit board 4.

[0136] The fuse 3 includes at least two terminals 31, each terminal 31 passing through a third conductive through hole 413 and connected to the pad 42 of the corresponding third conductive through hole 413, so as to realize the electrical connection between the fuse 3 and the circuit board 4.

[0137] In some embodiments, along the thickness direction of the circuit board 4, the pads 42 of the first conductive via 411 and the second conductive via 412 are located on one side of the circuit board 4, and the pads 42 of the plurality of third conductive vias 413 are located on the other side of the circuit board 4. The pads 42 of the third conductive vias 413 are not shown in the accompanying drawings of this application.

[0138] Reference Figure 8 and Figure 9 The pads 42 of the first conductive via 411 and the second conductive via 412 are located on the side of the circuit board 4 away from the sidewall D, and the pads 42 of the multiple third conductive vias 413 are located on the other side of the circuit board 4 facing the sidewall D.

[0139] Fuse 3 is located on one side of circuit board 4, and each terminal 31 of fuse 3 is inserted from one side of circuit board 4 into a third conductive through hole 413 on the other side of circuit board 4, and the terminal 31 of fuse 3 and the corresponding pad 42 of the third conductive through hole 413 are connected on the other side of circuit board 4. Then circuit board 4 is fixed in the second housing 2. Next, a first conductive connector 041 is inserted from the other side of circuit board 4 into a first conductive through hole 411 on one side of circuit board 4, and the first conductive connector 041 and the pad 42 of the first conductive through hole 411 are connected on one side of circuit board 4. A second conductive connector 042 is inserted from the other side of circuit board 4 into a second conductive through hole 412 on one side of circuit board 4, and the second conductive connector 042 and the pad 42 of the second conductive through hole 412 are connected on one side of circuit board 4.

[0140] The solution presented in this application realizes the assembly of fuse modules and circuit breaker modules. The assembly process is simple and easy to operate, which helps to improve assembly efficiency.

[0141] In some embodiments, refer to Figure 8 and Figure 9 The inner wall of the second housing 2 includes a pressure plate 215, a portion of the circuit board 4 is located between the pressure plate 215 and the side wall D, and the pressure plate 215 is used to abut against one side of the circuit board 4 to confine the circuit board 4 between the pressure plate 215 and the side wall D.

[0142] The pressure plate 215 includes multiple pressure plates, which are distributed at intervals along the inner wall of the second housing 2. One end of each pressure plate 215 extends to one side of the circuit board 4, and the pressure plate 215 abuts against the first circuit board 4.

[0143] In some embodiments, refer to Figure 9 The side wall D includes a positioning protrusion 214 facing the circuit board 4. The circuit board 4 has a positioning hole 43. The positioning protrusion 214 is inserted into the positioning hole 43, thereby realizing the positioning of the circuit board 4 in the second housing 2, thus ensuring the connection between the circuit board 4 and the conductive connector 04.

[0144] In the embodiments of this application, the number of fuses 3 can be selected according to actual needs. In some embodiments, fuse 3 includes one fuse 3, which includes two terminals 31. Correspondingly, the third conductive through hole 413 on the circuit board 4 includes two terminals 31. One terminal 31 passes through a third conductive connector 04 and is connected to the corresponding pad 42 of the third conductive connector 04.

[0145] In some embodiments, refer to Figure 8 and Figure 9 The fuse 3 includes multiple fuses connected in series. Each fuse 3 includes two terminals. Correspondingly, the circuit board 4 has multiple third conductive holes 413. A terminal 31 passes through a third conductive hole 413 and is connected to the pad 42 of the corresponding third conductive hole 413.

[0146] In this embodiment, multiple fuses 3 are connected in series via a circuit board 4, and the multiple fuses 3 are arranged along the thickness or width direction of the current-carrying busbar 03. Since the breaking capacity of a single fuse 3 is limited, connecting multiple fuses 3 in series to share the arc energy is beneficial to improving the breaking capacity of the switching device 10. Furthermore, when one fuse 3 fails and breaks due to a minor defect or accidental vibration, the other fuses 3 still provide protection, improving the reliability of the switching device 10.

[0147] While meeting the same breaking capacity, a single fuse 3 has a larger volume, while setting multiple fuses 3 at intervals helps to optimize the space layout and reduce the floor space occupied.

[0148] In other embodiments of this application, the fuse 3 includes a plurality of fuses 3, at least some of which are connected in parallel. Those skilled in the art can selectively design according to actual needs.

[0149] In the switching device 10 provided in this application, the specific form of the fuse 3 can be selected according to actual needs. In some embodiments, the fuse 3 is a fuse 3 with arc suppression function. By using the fuse 3, while ensuring a high breaking capacity, the energy of the breaking branch is reduced, thereby further reducing the arc voltage of the switching device 10 during the breaking process. This prevents the risk of parallel circuit devices being broken down due to excessive arc voltage of the switching device 10 during the breaking process. It is suitable for scenarios that require suppression of breaking arc voltage or scenarios with many parallel loads.

[0150] In some embodiments, the fuse 3 is a fuse 3 that does not have arc suppression function. This application does not specifically limit the specific form of the fuse 3.

[0151] In other embodiments of this application, the first conductive connector 041 and the second conductive connector 042 can also be connected to the fuse 3 via a cable, which is simple to connect and lightweight.

[0152] The first conductive connector 041 and the second conductive connector 042 of this application will be described below with reference to the accompanying drawings, taking the connection of the first conductive connector 041 and the second conductive connector 042 to the fuse 3 via the circuit board 4 as an example.

[0153] Figure 10A This is a second partial structural schematic diagram of a switching device provided in an embodiment of this application. (Refer to...) Figure 10A The outer periphery of the flow channel 03 is covered with an insulating plastic part 07, and the insulating plastic part 07 and the flow channel 03 are integrally injection molded into an integrated middle frame structure.

[0154] exist Figure 7A and Figure 10A In the given embodiment, the first outer shell 1 includes three parts: one part is an integral mid-frame structure formed by injection molding of insulating plastic part 07 and flow channel 03; another part is the part of the integral mid-frame structure facing the controller 20; and the third part is the part of the integral mid-frame structure facing away from the controller 20. The three parts are assembled to form the first outer shell 1.

[0155] In other embodiments of this application, the first outer shell 1 is an insulating plastic shell, and the first outer shell 1 and the flow channel 03 are integrally injection molded into an integral middle frame structure.

[0156] Figure 10B This is the third partial structural schematic diagram of a switching device provided in an embodiment of this application. (Refer to...) Figure 6 and Figure 10B The first segment 032 of part B is closer to the second outer shell 2, and the third segment 034 of part B is closer to part A. One end of the first segment 032 of part B passes through the first outer shell 1 and the second outer shell 2 to form a first connecting end 0311. One end of part C passes through the first outer shell 1 to form a second connecting end 0312.

[0157] Figure 11 for Figure 10B Exploded view of the central switching device. (Refer to...) Figure 10B and Figure 11 The first conductive connector 041 is fixed to one side of part B along the thickness direction of the flow channel 03.

[0158] There are various ways to connect the first conductive connector 041 and part B. In some embodiments, the first conductive connector 041 is fixed to one side of part B along the thickness direction of the flow channel 03 by riveting. The side of part B along the thickness direction of the flow channel 03 includes a first riveting protrusion 036, and the first conductive connector 041 includes a first riveting groove 0411. The first riveting protrusion 036 is embedded in the first riveting groove 0411, thereby fixing the first conductive connector 041 to part B. This riveting fixing method is simple in structure and convenient to operate. This application does not specifically limit the connection method between the first conductive connector 041 and part B.

[0159] Reference Figure 10B and Figure 11 The second conductive connector 042 is fixed to one side of part C along the thickness direction of the flow channel 03.

[0160] There are various ways to connect the second conductive connector 042 and part C. In some embodiments, the second conductive connector 042 is fixed to one side of part C along the thickness direction of the flow channel 03 by riveting. The side of part C along the thickness direction of the flow channel 03 includes a first riveting protrusion 037, and the second conductive connector 042 includes a second riveting groove 0421. The first riveting protrusion 036 is embedded in the second riveting groove 0421, thereby fixing the second conductive connector 042 to part C. This riveting method is simple in structure and convenient to operate. The connection method between the second conductive connector 042 and part C in this application embodiment is not specifically limited.

[0161] Since one end of part B passes through the first outer shell 1 and the second outer shell 2 to form the first connection end 0311, and one end of part C passes through the first outer shell 1 to form the second connection end 0312, part B is closer to the second outer shell 2.

[0162] In some embodiments, the first connection terminal 0311 is the input terminal of the current bus 03, and the second connection terminal 0312 is the output terminal of the current bus 03. By shortening the length of the first conductive connector 041 at the input terminal of the fuse 3 and the current bus 03, unnecessary resistance and inductance are reduced, which is beneficial for rapid circuit disconnection.

[0163] In some embodiments, refer to Figure 10B and Figure 11 A portion of the first conductive connector 041 is located on one side of part B along the width direction of the flow channel 03. One end of the portion of the first conductive connector 041 is used to connect to the fuse 3. A portion of the second conductive connector 042 is located on the other side of part B along the width direction of the flow channel 03. One end of the portion of the second conductive connector 042 is used to connect to the fuse 3.

[0164] By positioning a portion of the first conductive connector 041 and a portion of the second conductive connector 042 at both ends of portion B along the width direction of the flow channel 03, and arranging the portion of the first conductive connector 041 and the second conductive connector 042 spaced apart along the width direction of the flow channel 03, sufficient creepage distance and safety clearance are ensured. Furthermore, the dimension of the switching device 10 along the thickness direction of the flow channel 03 is reduced, thereby facilitating a reduction in the space occupied by the switching device 10.

[0165] In some embodiments, the first conductive connector 041 and the second conductive connector 042 are fixed to the same side of the flow channel 03 along its own thickness direction.

[0166] In some embodiments, refer to Figure 10B and Figure 11 The first conductive connector 041 and the second conductive connector 042 are fixed to different sides of the flow channel 03 along its own thickness direction.

[0167] In some embodiments, part B is used to fix the insulating plate 05 on the other side along the thickness direction of the flow channel 03, and a portion of the second conductive connector 042 is covered with an insulating sleeve 06, which is mounted on the insulating plate 05.

[0168] Because part C is further away from the second outer casing 2, the length of the second conductive connector 042 is greater than the length of the first conductive connector 041. An insulating sleeve 06 is wrapped around a portion of the second conductive connector 042 to increase the insulation performance of the second conductive connector 042, part B, and the first conductive connector 041. The insulating sleeve 06 is mounted on the insulating plate 05 to support the second conductive connector 042 and prevent it from breaking.

[0169] There are various ways to connect the insulating plate 05 and part B. In some embodiments, the insulating plate 05 is fixed to part B by riveting. Part B includes a third riveting protrusion 038 on the other side along the thickness direction of the flow channel 03, and the insulating plate 05 includes a third riveting groove 052. The third riveting protrusion 038 is embedded in the third riveting groove 052, thereby fixing the insulating plate 05 to part B. This riveting fixing method is simple in structure and convenient to operate. This application does not specifically limit the connection method between the insulating plate 05 and part B.

[0170] In some embodiments, refer to Figure 10B and Figure 11 A portion of the insulating plate 05 is located on one side of a portion of the second conductive connector 042 along the thickness direction of the flow channel 03. The portion of the insulating plate 05 includes a third through hole 051, which penetrates the portion of the insulating plate 05 along the thickness direction of the flow channel 03.

[0171] The insulating sleeve 06 includes a plurality of second protrusions 061 on one side facing a portion of the insulating plate 05. Each of the plurality of second protrusions 061 passes through a third through hole 051 on the insulating plate 05. The third through holes 051 through which each second protrusion 061 passes are different. By inserting the second protrusion 061 into the third through hole 051, the insulating sleeve 06 is installed and positioned on the insulating plate 05, thereby providing support for the insulating sleeve 06.

[0172] In some embodiments, there is a gap between the insulating sleeve 06 and a portion of the insulating plate 05, which can be used for heat insulation.

[0173] In some embodiments, the flow channel 03 is integrally injection molded with a portion of the first housing 1, and the gap between the insulating sleeve 06 and the insulating plate 05 can be filled with injection molding material to improve the support force on the second conductive connector 042.

[0174] In the embodiments of this application, the materials of the insulating plate 05 and the insulating sleeve 06 can be selectively designed according to actual needs, and this application does not make specific limitations in this regard.

[0175] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope 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 switching device, characterized in that, The switching device includes: A first housing, the first housing being used to house an igniter, a piston, and a flow channel, the piston being used to cut the flow channel along its thickness direction; A second housing is mounted on the outer wall of the first housing, and the second housing is used to house the fuse. A conductive connector is fixed to a portion of the flow channel, and another conductive connector is fixed to another portion of the flow channel. The portion of the flow channel corresponding to the piston along the thickness direction of the flow channel is located between the portion of the flow channel and the other portion of the flow channel. One end of each of the conductive connectors passes through the first housing and extends into the second housing, and the portion of each conductive connector extending into the second housing is connected to the fuse.

2. The switching device according to claim 1, characterized in that, The second housing is used to accommodate a circuit board. The fuse, the one conductive connector, and the other conductive connector are all connected to the circuit board. The fuse is electrically connected to the one conductive connector and the other conductive connector through the internal wiring of the circuit board.

3. The switching device according to claim 2, characterized in that, The circuit board includes a plurality of conductive vias, each of which penetrates the circuit board along the thickness direction, and the inner wall of each conductive via extends along one side of the circuit board along the thickness direction to form a pad. The conductive connector passes through one of the plurality of conductive vias and is connected to the pad of the conductive via; the other conductive connector passes through another of the plurality of conductive vias and is connected to the pad of the other conductive via. The fuse includes at least two terminals, each of which passes through a different conductive through-hole among the plurality of conductive through-holes and is connected to the pad of the corresponding conductive through-hole. Along the thickness direction of the circuit board, the pads of one conductive via and the pads of the other conductive via are located on one side of the circuit board, and the pad of the other conductive via is located on the other side of the circuit board.

4. The switching device according to any one of claims 1-3, characterized in that, The fuse includes multiple fuses connected in series, wherein the multiple fuses are arranged at intervals along the thickness or width direction of the flow busbar.

5. The switching device according to any one of claims 1-4, characterized in that, The second housing is filled with insulating potting compound, which covers the portion of the fuse and each of the conductive connectors that extends into the second housing.

6. The switching device according to claim 5, characterized in that, The first housing includes a first protrusion on the side facing the second housing, and the outer peripheral surface of the first protrusion includes a groove, which is recessed inward from the outer peripheral surface of the first protrusion; The second outer casing includes a first through hole on one side wall facing the first outer casing, and the first through hole penetrates the side wall along the thickness direction of the side wall; One end of the first protrusion extends through the first through hole into the second housing, the groove is at least partially located inside the second housing, and the insulating potting compound is used to fill the groove.

7. The switching device according to any one of claims 1-6, characterized in that, The first housing includes two first sidewalls and two second sidewalls, the two first sidewalls being arranged opposite to each other along the thickness direction of the flow channel, and the two second sidewalls being arranged opposite to each other along the length direction of the flow channel; The ignition device and the piston are located between one of the two first sidewalls and the flow channel; The two ends of the flow channel pass through the corresponding second sidewall to form a connection end. The distance between one connection end of the flow channel and one first sidewall is smaller than the distance between the other connection end of the flow channel and the first sidewall. The second housing is located on the second sidewall on the side where one of the connection ends of the flow channel is located, and the distance between the fuse and the first sidewall is greater than the distance between the flow channel and the first sidewall.

8. The switching device according to any one of claims 1-7, characterized in that, The flow channel includes a first segment, a second segment, and a third segment, the first segment and the third segment being connected to different sides of the second segment along the length direction of the flow channel, the second segment including a second through hole that penetrates the second segment along the length direction of the flow channel; A portion of the first housing is accommodated within the second through hole, the portion of the first housing including a mounting hole extending along the length of the through-hole, one end of a fastener passing through the second housing, extending into the mounting hole and connecting to the inner wall of the mounting hole.

9. The switching device according to any one of claims 1-8, characterized in that, The conductive connector is fixed to a portion of the flow channel on one side along the thickness direction of the flow channel, and the portion of the conductive connector is located on one side of the flow channel along the width direction of the flow channel. One end of the portion of the conductive connector is used to connect to the fuse.

10. The switching device according to any one of claims 1-9, characterized in that, The other conductive connector is fixed to one side of another portion of the flow channel along the thickness direction of the flow channel, and a portion of the other conductive connector is located on the other side of a portion of the flow channel along the width direction of the flow channel. One end of the portion of the other conductive connector is used to connect to the fuse.

11. The switching device according to claim 10, characterized in that, A portion of the flow channel is used to fix an insulating plate on the other side along the thickness direction of the flow channel, and an insulating sleeve is covered on the outer periphery of a portion of the other conductive connector, the insulating sleeve being installed on the insulating plate.

12. The switching device according to claim 11, characterized in that, A portion of the insulating plate is located on one side of the portion of the other conductive connector along the thickness direction of the flow channel, and the portion of the insulating plate includes a third through hole that penetrates the portion of the insulating plate along the thickness direction of the flow channel. The insulating sleeve includes a plurality of second protrusions on the side facing the portion of the insulating plate, each second protrusion passing through a different third through hole in the insulating plate, and there are gaps between the portions of the insulating sleeve facing the insulating plate.

13. A power device, characterized in that, The power device includes a power source and a switching device according to any one of claims 1-12, wherein the power source supplies power to the ignition device of the switching device.

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