Shutdown device and shutdown system

Abstract

A shutdown device (1) comprises: a pyro-fuse (10) having a busbar (15) inserted into a power supply line (PL) and a piston (13) that is disposed above the busbar and that moves toward the busbar to divide the busbar; and a melting fuse (20) connected in parallel to the pyro-fuse. The melting fuse has a fuse case (21), a fuse element (23) that is provided in the fuse case and is melted when excessive current flows therethrough, and a granular extinguishing arc material (29) provided in the fuse case. The fuse element extends in a direction intersecting the moving direction of the piston.

Description

Isolation devices and isolation systems

[0001] The present disclosure relates to a disconnection device that disconnects a power supply path, and a disconnection system that includes the disconnection device.

[0002] Conventionally, there has been known a circuit breaker that protects an electric circuit by interrupting a power supply path when an overcurrent flows through the power supply path of the electric circuit. As an example of this type of circuit breaker, Patent Document 1 discloses a circuit breaker that includes a pyro-fuse arranged on the power supply path and a blowout fuse connected in parallel to the pyro-fuse. In this circuit breaker, when the power supply path is interrupted by the pyro-fuse, a current that would otherwise continue to flow toward the pyro-fuse is diverted to the blowout fuse, thereby suppressing the occurrence of an arc (arc discharge) in the pyro-fuse.

[0003] Japanese Patent Application Laid-Open No. 2021-170522

[0004] However, the circuit breaker disclosed in Patent Document 1 has a problem in that an arc is generated when the blow fuse is blown by the current flowing to the blow fuse side, and the electric circuit cannot be adequately protected.

[0005] Therefore, the present disclosure provides a circuit breaker that can efficiently extinguish an arc that occurs in a blown fuse, and a circuit breaker system that includes the circuit breaker.

[0006] A circuit breaking device according to one aspect of the present disclosure includes a pyroelectric fuse having a busbar inserted into a power supply path and a piston disposed above the busbar and moving toward the busbar to separate the busbar, and a blowout fuse connected in parallel to the pyroelectric fuse, wherein the blowout fuse has a fuse case, a fuse element disposed within the fuse case and blown when an overcurrent flows, and a granular arc-extinguishing material disposed within the fuse case, and the fuse element extends in a direction intersecting the direction in which the piston moves.

[0007] A shutoff system according to one aspect of the present disclosure includes the shutoff device described above and an abnormality detection device that outputs a shutoff signal to the pyro-fuse when an abnormality occurs in the power supply path, and the pyro-fuse of the shutoff device ignites based on the shutoff signal output from the abnormality detection device, thereby moving the piston toward the bus bar and separating the bus bar.

[0008] According to the interrupting device and interrupting system of the present disclosure, arcs occurring in blown fuses can be efficiently extinguished.

[0009] 1 is a diagram showing a schematic circuit configuration of an interruption system according to an embodiment; FIG. 2 is a perspective view of an interruption device according to an embodiment; FIG. 3 is a diagram showing a circuit breaker according to an embodiment, viewed from above; FIG. 4 is a cross-sectional view showing a pyro fuse included in the interruption device according to an embodiment; FIG. 5 is a perspective view of a blow fuse included in the interruption device according to an embodiment; FIG. 6 is a cross-sectional view of a blow fuse included in the interruption device according to an embodiment; FIG. 7 is a diagram showing the state of a blow fuse included in the interruption device according to an embodiment before and after it is blown; FIG. 8 is a perspective view of an interruption device according to a modified example of an embodiment; FIG. 9 is a diagram showing a circuit breaker according to a modified example of an embodiment, viewed from above;

[0010] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0011] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, components, arrangement positions and connection forms of the components, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not recited in the independent claims are described as optional components.

[0012] Furthermore, all drawings are schematic diagrams and are not necessarily strictly illustrated. Therefore, for example, the scales of the drawings do not necessarily match. Furthermore, in each drawing, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0013] Furthermore, in this specification, terms indicating the relationship between elements, such as orthogonal, parallel, perpendicular, and the same, terms indicating the shape of elements, such as rectangular and circular, as well as numerical values ​​and numerical ranges, are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent (e.g., about 10%).

[0014] Furthermore, in this specification, explanations may be made using terms indicating directions such as "up," "down," "left," "right," "front," and "rear," but these merely indicate relative positional relationships and do not limit the present disclosure.

[0015] (Embodiment) [Configuration of Shutdown System] An shutdown system according to an embodiment will be described with reference to FIG.

[0016] FIG. 1 is a diagram showing a schematic circuit configuration of an interruption system 50 according to an embodiment.

[0017] The interruption system 50 is provided in a power supply path PL for supplying power from a battery BT to a load LD. The interruption system 50 is a system that interrupts the supply of power when an abnormality occurs in the power supply path PL. The interruption system 50 is composed of an abnormality detection device 60 and an interruption device 1. The interruption device 1 is connected to the abnormality detection device 60 via a signal line sL.

[0018] As shown in FIG. 1 , the abnormality detection device 60 is provided in a power supply path PL connecting the negative electrode of the battery BT and the negative electrode side of the load LD. The interrupting device 1 is provided in the power supply path PL connecting the positive electrode of the battery BT and the positive electrode side of the load LD. Alternatively, the abnormality detection device 60 may be provided in the power supply path PL connecting the positive electrode of the battery BT and the positive electrode side of the load LD, and the interrupting device 1 may be provided in the power supply path PL connecting the negative electrode of the battery BT and the negative electrode side of the load LD. In other words, the abnormality detection device 60 and the interrupting device 1 may be connected to different poles of the battery BT. Alternatively, the abnormality detection device 60 and the interrupting device 1 may be connected in series to the same pole of the battery BT.

[0019] The battery BT is a secondary battery such as a lithium-ion battery. The load LD is an electrical device such as a motor, an inverter circuit, a DC-DC converter, etc. The battery BT supplies DC current to the load LD via a power supply path PL, or receives DC current from the load LD.

[0020] The abnormality detection device 60 is a device that detects an abnormality in the power supply path PL. The abnormality detection device 60 has a detection unit 61 for detecting an abnormality in the power supply path PL and an abnormality determination unit 62 that determines whether or not an abnormality exists in the power supply path PL.

[0021] The detection unit 61 detects an abnormal state of the power supply path PL by detecting a current flowing through the power supply path PL. The detection unit 61 detects the current in the power supply path PL by, for example, measuring a voltage across both ends of a resistor inserted in the power supply path PL. The detection value detected by the detection unit 61 is output to the abnormality determination unit 62.

[0022] The abnormality determination unit 62 determines whether or not an abnormality has occurred in the power supply path PL based on the detection value output from the detection unit 61. For example, the abnormality determination unit 62 determines that an abnormality has occurred in the power supply path PL when the current value output from the detection unit 61 exceeds a predetermined threshold value. When it is determined that an abnormality has occurred in the power supply path PL, the abnormality determination unit 62 outputs a shutoff signal s1 to the shutoff device 1 via the signal line sL to shut off the power supply path PL.

[0023] In addition, when the abnormality detection device 60 is communicatively connected to, for example, an ECU (Electronic Control Unit) of a vehicle, the abnormality detection device 60 may output the above-mentioned shutdown signal s1 to the shutdown device 1 based on a crash signal output from the ECU. The configuration of the shutdown device 1 will be described below.

[0024] [Configuration of Circuit Breaker] The configuration of the circuit breaker 1 according to the embodiment will be described with reference to FIGS. 2 to 6. FIG.

[0025] Fig. 2 is a perspective view of the circuit breaker 1 according to the embodiment, and Fig. 3 is a top view of the circuit breaker 1.

[0026] 2 and 3 , interrupting device 1 includes pyrofuse 10 and blow fuse 20 connected in parallel to pyrofuse 10. Interrupting device 1 also includes lead conductors 31 and 32 for connecting pyrofuse 10 and blow fuse 20.

[0027] The pyrofuse 10 cuts off the power supply path PL by disconnecting the bus bar of the pyrofuse 10 based on the cutoff signal s1 output from the abnormality detection device 60.

[0028] Fig. 4 is a cross-sectional view showing pyrofuse 10 included in circuit breaker 1. Fig. 4(a) shows the state before bus bar 15 is severed, and Fig. 4(b) shows the state after bus bar 15 is severed. Note that pyrofuse 10 shown in Fig. 4 is merely an example, and a pyrofuse with a different appearance from those shown in Figs. 2 and 3 is shown.

[0029] As shown in (a) of Figure 4, the pyrofuse 10 has a casing 11 that forms the outer shell of the pyrofuse 10, a piston 13 that can move in a first direction d1, an ignition unit 12 that activates the piston 13, and a bus bar 15 that is inserted into the power supply path PL.

[0030] Casing 11 has a cylindrical shape and is arranged along first direction d1. A central portion of bus bar 15, piston 13, and ignition unit 12 are arranged inside casing 11. Both ends of bus bar 15 are arranged outside casing 11.

[0031] The busbars 15 are linear, flat conductors arranged along a second direction d2 that intersects with the first direction d1. In this example, the second direction d2 is perpendicular to the first direction d1. That is, in the present disclosure, the first direction d1 is a downward direction, the second direction d2 is a rightward direction, and the third direction d3 is a backward direction. The busbars 15 extending in the second direction d2 penetrate the side surface of the casing 11, and both ends of the busbars 15 protrude outward from the side surface of the casing 11.

[0032] 2 and 3, the bus bar 15 is inserted into the power supply path PL by being connected to conductive plates 71 and 72 that are part of the power supply path PL. Specifically, one end 15a of the bus bar 15 is connected by a fastening member to conductive plate 71 that protrudes laterally from the insulating base 75, and the other end 15b of the bus bar 15 is connected by a fastening member to conductive plate 72 that protrudes laterally from the insulating base 75. The bottom surface of the pyrofuse 10 is not supported by any other member, and the pyrofuse 10 is suspended in midair.

[0033] As shown in (a) of FIG. 4, the ignition unit 12 is provided inside the casing 11. When an overcurrent occurs in the power supply path PL, that is, when the ignition unit 12 receives a shutoff signal s1 output from the abnormality detection device 60, the ignition unit 12 activates the piston 13. Specifically, the ignition unit 12 ignites gunpowder to rapidly expand the gas inside the casing 11, thereby moving the piston 13 at high speed in the first direction d1. In other words, the piston 13 moves downward. In other words, the piston 13 moves toward the bus bar 15.

[0034] Piston 13 has a cylindrical shape and is disposed inside casing 11 so as to extend along first direction d1. When ignition unit 12 is ignited, piston 13 moves in first direction d1 and severs busbar 15 (see FIG. 4B ). When piston 13 severs busbar 15, it collides with busbar 15 or a part of casing 11, generating vibrations in first direction d1. The vibrations generated by piston 13 are transmitted to blow fuse 20 via both ends of busbar 15 and lead conductors 31 and 32. The transmission of this vibration will be described later.

[0035] For example, if bus bar 15 is severed while an overcurrent is flowing, an arc may occur in the severed area of ​​bus bar 15. To address this issue, in this circuit breaker 1, blow fuse 20 is connected in parallel to bus bar 15, and the current that would otherwise continue to flow in the severed area of ​​bus bar 15 is diverted into blow fuse 20, thereby suppressing the occurrence of an arc in the severed area.

[0036] Fig. 5 is a perspective view of the blow fuse 20 included in the circuit breaker 1. Fig. 6 is a cross-sectional view of the blow fuse 20. Note that Fig. 5 shows a state in which the fuse case 21 and the arc-extinguishing material 29 are partially removed.

[0037] The blow fuse 20 is a fuse that cuts off the power supply path PL by blowing when an overcurrent flows. The resistance value of the blow fuse 20 is 10 times or more the resistance value of the pyrofuse 10. Therefore, the blow fuse 20 is configured to supply power as usual via the pyrofuse 10 when no overcurrent is occurring. The blow fuse 20 may also be designed not to blow when a large current flows for an extremely short period of time. Furthermore, the resistance value of the blow fuse 20 is preferably, for example, 10 to 100 times the resistance value of the pyrofuse 10.

[0038] As shown in Figures 5 and 6, the blown fuse 20 has a fuse case 21 that forms the outer shell of the blown fuse 20, one terminal 22a and the other terminal 22b that are external terminals, a fuse element 23 that melts when an overcurrent flows, and a granular arc-extinguishing material 29.

[0039] The fuse case 21 is an insulating tube made of, for example, glass, ceramic, or resin, and the fuse element 23 and the arc-extinguishing material 29 are provided inside the fuse case 21 .

[0040] The first terminal 22a and the second terminal 22b are provided at opposite ends of the fuse case 21. A fuse element 23 is disposed between the first terminal 22a and the second terminal 22b.

[0041] The fuse element 23 is plate-shaped and melts when an overcurrent flows. The fuse element 23 is made of, for example, aluminum or copper. One end of the fuse element 23 is connected to one terminal 22a, and the other end of the fuse element 23 is connected to the other terminal 22b. The fuse element 23 is disposed so as to extend along the second direction d2. The fuse element 23 also has a fuse element surface 24 that extends along the second direction d2 and the third direction d3, and is disposed so that the fuse element surface 24 is perpendicular to the first direction d1. The fuse element surface 24 refers to the top surface of the fuse element 23. In this embodiment, "perpendicular" is not limited to 90°, but may include, for example, a range of ±10° from 90°.

[0042] The fuse element 23 has a plurality of through holes 25 aligned along a third direction d3 perpendicular to both the first direction d1 and the second direction d2, a plurality of elongated holes 26 formed along the third direction d3, and a narrow portion 27 that melts when an overcurrent flows. The narrow portion 27 is located between two adjacent through holes 25 in the third direction d3 or between the through holes 25 and the elongated holes 26. The narrow portion 27 is the narrowest part of the fuse element 23 (the length in the third direction d3) and melts when an overcurrent flows. An arc occurs in the melting region immediately after the narrow portion 27 melts.

[0043] The arc-extinguishing material 29 is a sand-like material for extinguishing an arc that occurs when the fuse element 23 melts. The arc-extinguishing material 29 is made of spherical silica (silicon dioxide) or the like. The particle size of the arc-extinguishing material 29 is, for example, 250 μm or less, and the ratio of the major axis to the minor axis is 2 or less.

[0044] The arc-extinguishing material 29 is disposed around the fuse element 23 and is provided so as to be movable in the first direction d1 within the fuse case 21. That is, the arc-extinguishing material 29 is filled within the fuse case 21, but when an arc occurs, the arc-extinguishing material 29 melts, and the volume of the melted arc-extinguishing material 29 becomes smaller than the bulk volume of the granules before melting, creating a space around the melted arc-extinguishing material 29. At least a portion of the arc-extinguishing material 29 has a particle size smaller than the diameter of the through hole 25 and the width of the long hole 26, to an extent that the arc-extinguishing material 29 can pass through the through hole 25 and the long hole 26 by vibration. In other words, the arc-extinguishing material 29 includes particles having a particle size smaller than the diameter of the through hole 25 and the width of the long hole 26.

[0045] At least a part of the arc-extinguishing material 29 has a grain size smaller than the width of the narrow portion 27. In other words, the arc-extinguishing material 29 includes grains having a grain size smaller than the width of the narrow portion 27.

[0046] Here, the states of the blow fuse 20 included in the circuit breaker 1 before and after blowing will be described using Figure 7. Figure 7(a) shows the state before blowing, and Figure 7(b) shows the state after blowing. As shown in Figure 7(b), after blowing, the fuse element 23 blows, and a molten region 28 is created, which is a region where the arc has significantly melted the arc-extinguishing material 29. The molten region 28 is a region where the fuse element 23 around the blown portion has evaporated and mixed with the melted portion of the arc-extinguishing material 29.

[0047] 5 and 6, since arc-extinguishing material 29 that comes into contact with the arc melts, in order to quickly extinguish the arc, it is necessary to bring fresh, unmelted arc-extinguishing material 29 into contact with the arc. In order to quickly extinguish the arc generated by the melting of fuse element 23, circuit breaker 1 of the embodiment has a structure in which melting fuse 20 is vibrated to bring fresh arc-extinguishing material 29 into contact with the arc. The connection structure of pyrofuse 10 and melting fuse 20 will be described below.

[0048] As shown in FIGS. 2 and 3, the blow fuse 20 is connected to the pyrofuse 10 via the lead conductors 31 and 32 .

[0049] Each of the lead conductors 31, 32 is a linear, flat conductor. Each of the lead conductors 31, 32 is arranged along the third direction d3 and attached perpendicularly to the bus bar 15. Note that each of the lead conductors 31, 32 is not limited to being linear, and may be L-shaped or U-shaped.

[0050] One end of each of the lead conductors 31 and 32 is fixed to the conductor plates 71 and 72, respectively, together with the bus bar 15 by a fastening member or the like. Specifically, one end 31a of the lead conductor 31 is connected to one end 15a of the bus bar 15. One end 32a of the lead conductor 32 is connected to the other end 15b of the bus bar 15.

[0051] The other ends of the lead conductors 31 and 32 are connected to external terminals 22a and 22b at both ends of the blow fuse 20, respectively, by welding, brazing, or a fastening member. Specifically, the other end 31b of the lead conductor 31 is connected to one terminal 22a of the blow fuse 20 and is a free end. The other end 32b of the lead conductor 32 is connected to the other terminal 22b of the blow fuse 20 and is also a free end. Here, "free end" refers to an end that is not fixed so that it can vibrate freely. In other words, the blow fuse 20 is suspended in the air via the lead conductors 31 and 32 and is supported by the lead conductors 31 and 32 so that it can vibrate freely in the first direction d1.

[0052] As described above, piston 13 generates vibrations in first direction d1 due to a collision when it separates busbar 15. In other words, piston 13 generates up-and-down vibrations due to a collision when it separates busbar 15. The vibrations generated by piston 13 are transmitted to blow fuse 20 via both ends of busbar 15 and lead conductors 31, 32. Vibration of blow fuse 20 stimulates movement of arc-extinguishing material 29 within fuse case 21. This increases the chances that arc-extinguishing material 29 will come into contact with the arc generated in the blow region, enabling the arc generated in the blow region to be extinguished in a short period of time. This circuit breaker 1 can efficiently extinguish arcs generated in pyrofuse 10 and blow fuse 20.

[0053] Here, efficient arc extinguishing has the following advantages. First, the arc can be extinguished (current decay) quickly. Second, the current can be interrupted even with a small amount of arc-extinguishing material 29 around the fuse element 23 (i.e., even with a small fuse tube). Third, the arc can be extinguished even under severe short-circuit conditions (e.g., high current, high voltage, etc.).

[0054] In the present embodiment, when it is described below that arc extinguishing can be performed efficiently, it is assumed that the above-mentioned first to third advantages are obtained.

[0055] Furthermore, it is desirable that the period of vibration generated by piston 13 colliding with busbar 15 matches the vibration period of blow fuse 20 connected to pyrofuse 10 via lead conductors 31 and 32. In other words, it is desirable that the vibration generated by piston 13 colliding with busbar 15 includes the resonant frequency of lead conductors 31 and 32 and blow fuse 20 when both ends of busbar 15 are fixed ends.

[0056] [Operation of Breaker Device] The operation of the breaker device 1 when breaking the power supply path PL will be described.

[0057] When an abnormality such as an overcurrent occurs in power supply path PL, abnormality detection device 60 outputs a shutoff signal s1 to pyrofuse 10. Upon receiving shutoff signal s1, pyrofuse 10 activates piston 13 by igniting ignition unit 12, thereby separating busbar 15.

[0058] When busbar 15 is severed, an arc occurs in the severed region, but in this circuit breaker 1, because blow fuse 20 is connected in parallel to busbar 15, the current that would otherwise continue to flow toward pyrofuse 10 flows to blow fuse 20. This makes it possible to prevent arcing from occurring in pyrofuse 10.

[0059] Furthermore, in this circuit breaker 1, operation of piston 13 causes piston 13 to collide with bus bar 15 and casing 11, generating vibrations in pyrofuse 10. The vibrations generated in pyrofuse 10 are transmitted to blow fuse 20 via bus bar 15 and lead conductors 31, 32. When blow fuse 20 begins to vibrate, arc-extinguishing material 29 inside fuse case 21 is swung in first direction d1, and moves back and forth according to the vibration period.

[0060] The fuse element 23 melts due to the current flowing to the blow fuse 20 side, but the blow fuse 20 is vibrating due to the operation of the piston 13 before the fuse element 23 starts to melt, and continues to vibrate even after the fuse element 23 has melted. This increases the probability that the arc-extinguishing material 29 will come into contact with the arc that occurs in the melting region, allowing the arc to be extinguished in a short period of time. In other words, this circuit breaker 1 not only prevents arcing from occurring in the pyrofuse 10, but also efficiently extinguishes the arc in the blow fuse 20 after it has occurred.

[0061] As shown in FIGS. 8 and 9, the lead conductor 31 and the conductor plate 71 may be integrally formed, and the lead conductor 32 and the conductor plate 72 may be integrally formed.

[0062] (Summary) The first aspect of the circuit breaking device 1 is a circuit breaking device that cuts off a power supply path PL, and includes a pyro-fuse 10 having a bus bar 15 inserted into the power supply path PL, and a piston 13 that is arranged above the bus bar 15 and moves toward the bus bar 15 to separate the bus bar 15, and a blowout fuse 20 connected in parallel to the pyro-fuse 10, the blowout fuse 20 having a fuse case 21, a fuse element 23 that is provided in the fuse case 21 and blows when an overcurrent flows, and a granular arc-extinguishing material 29 that is provided in the fuse case 21, and the fuse element 23 extends in a direction intersecting the direction in which the piston 13 moves (first direction d1).

[0063] With this configuration, since the blow fuse 20 is connected in parallel to the pyrofuse 10, it is possible to suppress the occurrence of an arc in the pyrofuse 10. Furthermore, with this configuration, the fuse element 23 extends in a direction intersecting the direction in which the piston 13 moves, so the arc-extinguishing material 29 inside the fuse case 21 is more likely to move with the movement of the piston 13. This increases the chance that the arc-extinguishing material 29 will come into contact with the arc that occurs when the fuse element 23 blows. This allows the arc to be efficiently extinguished after it occurs in the blow fuse 20.

[0064] In the second aspect of the circuit breaker 1, the fuse element 23 is plate-shaped and extends along the extension direction of the bus bar 15, and the blown fuse 20 is arranged so that the upper surface of the fuse element 23 is perpendicular to the direction in which the piston 13 moves (first direction d1).

[0065] With this configuration, the arc-extinguishing material 29, which moves in the same direction as the direction in which the piston 13 moves (first direction d1), is more likely to come into contact with the melting region of the fuse element 23. As a result, after an arc occurs in the melting fuse 20, the arc can be efficiently extinguished.

[0066] In the circuit breaker 1 of the third aspect, the fuse element 23 has a narrow portion 27 that melts when an overcurrent flows, and the arc-extinguishing material 29 includes grains whose grain size is smaller than the width of the narrow portion 27 .

[0067] This configuration makes it easier for the arc-extinguishing material 29 to come into contact with the fusion region formed by the fusion of the narrow width portion 27. This increases the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the fusion region. This allows the arc to be efficiently extinguished after it occurs in the fusion fuse 20.

[0068] In the fourth aspect of the circuit breaking device 1, the fuse element 23 has a plurality of holes (e.g., through holes 25, long holes 26), the narrow portion 27 is located between two adjacent holes among the plurality of holes, and the arc extinguishing material 29 contains grains having a grain size smaller than that of the plurality of holes (e.g., through holes 25, long holes 26).

[0069] With this configuration, at least a portion of the arc-extinguishing material 29 can pass through the through hole 25 and the elongated hole 26 due to vibration, which increases the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the melting region. This allows the arc that occurs in the melting fuse 20 to be efficiently extinguished.

[0070] In the blocking device 1 of the fifth aspect, the plurality of holes include through holes 25 or elongated holes 26 .

[0071] In the circuit breaker 1 of the sixth aspect, the arc-extinguishing material is arranged around the fuse element 23 and is movable up and down within the fuse case 21 .

[0072] This configuration increases the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the melting region of the fuse element 23. This allows the arc to be efficiently extinguished after it occurs in the melting fuse 20.

[0073] In the circuit breaker 1 of the seventh embodiment, the blown fuse 20 is supported so as to be able to vibrate up and down.

[0074] According to this configuration, the blow fuse 20 can be vibrated up and down in conjunction with the movement of the piston 13. This vibration allows the arc-extinguishing material 29 of the blow fuse 20 to move up and down frequently, increasing the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the blowing region of the fuse element 23. This allows the arc to be efficiently extinguished after it occurs in the blow fuse 20.

[0075] In the circuit breaking device 1 of the eighth aspect, when the piston 13 collides with the bus bar 15, the blow fuse 20 starts vibrating, and the blow fuse 20 continues to vibrate even after the fuse element 23 is blown.

[0076] This configuration allows the arc-extinguishing material 29 to reliably come into contact with the arc that occurs in the melting region of the fuse element 23. As a result, after an arc occurs in the melting fuse 20, the arc can be efficiently extinguished.

[0077] In the circuit breaking device 1 of the ninth aspect, when the piston 13 collides with the bus bar 15, the blowout fuse 20 vibrates before the fuse element 23 starts to blow.

[0078] This configuration allows the arc-extinguishing material 29 to reliably come into contact with the arc that occurs in the melting region of the fuse element 23. As a result, after an arc occurs in the melting fuse 20, the arc can be efficiently extinguished.

[0079] The circuit breaker 1 of the tenth aspect further includes a lead-out conductor 31 (32) that connects the bus bar 15 and the fusion fuse 20, the lead-out conductor 31 (32) being connected to the bus bar 15, the other end 31b (32b) of the lead-out conductor 31 (32) being a free end, and the fusion fuse 20 being supported by the other end 31b (32b) of the lead-out conductor 31 (32).

[0080] According to this configuration, the blow fuse 20 can be vibrated via the lead conductor 31 (32). This vibration allows the arc-extinguishing material 29 of the blow fuse 20 to move frequently, increasing the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the blowing region of the fuse element 23. This allows the arc to be efficiently extinguished after it occurs in the blow fuse 20.

[0081] In the circuit breaking device 1 of the eleventh aspect, the period of vibration generated by the piston 13 colliding with the bus bar 15 matches the period of vibration of the blown fuse 20 .

[0082] This configuration ensures that the blow fuse 20 vibrates, thereby increasing the chances that the arc-extinguishing material 29 will come into contact with the arc that occurs in the blow region of the fuse element 23. This allows the arc to be efficiently extinguished after it occurs in the blow fuse 20.

[0083] In the circuit breaker 1 of the twelfth aspect, the resistance value of the blow fuse 20 is 10 times or more the resistance value of the pyrofuse 10 .

[0084] According to this configuration, when no overcurrent is occurring, power can be supplied as usual via pyrofuse 10. Furthermore, when an overcurrent occurs, after an arc is generated, the arc can be efficiently extinguished and the power supply path PL can be cut off.

[0085] A thirteenth aspect of the interruption system 50 includes the interruption device 1 of any of the above-described aspects, and an abnormality detection device 60 that outputs an interruption signal s1 to the pyrofuse 10 when an abnormality occurs in the power supply path PL. The pyrofuse 10 of the interruption device 1 is ignited based on the interruption signal s1 output from the abnormality detection device 60, thereby moving the piston 13 toward the busbar 15 and separating the busbar 15.

[0086] According to this configuration, it is possible to provide the interruption system 50 that can interrupt the power supply path PL while efficiently extinguishing the arc after it occurs.

[0087] While the shutoff device and the shutoff system according to the embodiments have been described above, the present disclosure is not limited to these embodiments. As long as they do not deviate from the spirit of the present disclosure, various modifications conceivable by those skilled in the art to the present embodiments and configurations constructed by combining components of different embodiments may also be included in the present disclosure.

[0088] The interrupting device is mounted, for example, on a vehicle such as an automobile, an electrical appliance such as a home appliance, etc. Examples of the vehicle include a battery-equipped vehicle such as a BEV (Battery Electric Vehicle) vehicle and a PHEV (Plug-in Hybrid Vehicle) vehicle. Note that the interrupting device may be mounted on an object having an electrical circuit other than an automobile or an electrical appliance. Furthermore, the interrupting device in the above-described embodiments may be used, for example, to interrupt an overcurrent in a power storage system, a power transmission system, etc.

[0089] The present disclosure is useful for a circuit breaker or the like that cuts off a power supply path when an overcurrent occurs.

[0090] REFERENCE SIGNS LIST 1 interrupter 10 pyrofuse 11 casing 12 ignition section 13 piston 15 busbar 15a one end 15b other end 20 blown fuse 21 fuse case 22a, 22b terminal 23 fuse element 24 fuse element surface 25 through hole 26 elongated hole 27 narrow width section 28 melting area 29 arc extinguishing material 31, 32 lead-out conductor 31a, 32a one end 31b, 32b other end (first end) 50 interrupter system 60 abnormality detection device 61 detection section 62 abnormality determination section 71, 72 conductor plate 75 insulating base BT battery d1 first direction d2 second direction d3 third direction LD load PL power supply path s1 interruption signal sL signal line

Claims

1. A power supply path interrupting device, a pyro-fuse including a bus bar inserted in the power supply path and a piston disposed above the bus bar and moving toward the bus bar to separate the bus bar; a blowout fuse connected in parallel to the pyrofuse; Equipped with The blown fuse is Fuse case and a fuse element provided in the fuse case and melted when an overcurrent flows; A granular arc-extinguishing material is provided in the fuse case; having The fuse element extends in a direction intersecting the direction in which the piston moves. Shut-off device.

2. the fuse element is plate-shaped and extends along an extension direction of the bus bar, The blow fuse is positioned so that the top surface of the fuse element is perpendicular to the direction in which the piston moves. The shutoff device according to claim 1 .

3. The fuse element has a narrow portion that melts when an overcurrent flows, The arc-extinguishing material includes grains having a grain size smaller than the width of the narrow portion. The interrupter according to claim 1 or 2.

4. the fuse element has a plurality of holes; the narrow portion is located between two adjacent holes among the plurality of holes, The arc-extinguishing material includes particles having a particle size smaller than that of the plurality of holes. The shutoff device according to claim 3.

5. The plurality of holes include through holes or long holes. The shutoff device according to claim 4.

6. The arc-extinguishing material is disposed around the fuse element; A fuse that can be moved up and down within the fuse case The interrupter according to claim 1 or 2.

7. The blown fuse is supported so that it can vibrate up and down. The interrupter according to claim 1 or 2.

8. When the piston collides with the bus bar, the blown fuse starts to vibrate. The blown fuse continues to vibrate after the fuse element is blown. The interrupter according to claim 1 or 2.

9. When the piston collides with the bus bar, the blow fuse vibrates before the fuse element starts to blow. The interrupter according to claim 1 or 2.

10. a lead conductor connecting the bus bar and the blowout fuse; The lead conductor is connected to the bus bar, The first end of the lead conductor is a free end, The blow fuse is supported at the first end of the lead conductor. The interrupter according to claim 1 or 2.

11. The period of vibration generated by the collision of the piston with the bus bar is the same as the period of vibration of the blown fuse. The shutoff device according to claim 10.

12. The resistance value of the blown fuse is 10 times or more the resistance value of the pyrofuse. The interrupter according to claim 1 or 2.

13. The interrupter according to claim 1 or 2, an abnormality detection device that outputs a cutoff signal to the pyro fuse when an abnormality occurs in the power supply path; Equipped with The pyro-fuse of the interrupting device is ignited based on the interrupting signal output from the abnormality detection device to move the piston toward the bus bar and cut off the bus bar. Shutdown system.