Blocking device

Abstract

This blocking device comprises: a housing; a pusher that is located inside the housing and has a recessed portion; an igniter that internally holds a powder, has a lid portion provided between the powder and the pusher, is disposed in the recessed portion, and generates a gas; a protection portion that is provided in the housing or the igniter and is located inside the recessed portion; and a conducting body that has a separation portion located below the pusher. When receiving the pressure of the gas generated by the igniter, the pusher moves the separation portion downward. The lid portion has an opening portion that is configured so as to open by receiving the pressure of the gas. The lower end of the protection portion is located downward from the lower end of the lid portion.

Description

Technical Field

[0001] The present disclosure relates to a cutoff device.

Background Art

[0002] Conventionally, a cutoff device used by being connected to an electric circuit is known. As such a cutoff device, a cutoff device having a piston (pusher) with a recess, an igniter disposed in the recess, and a bus bar (conductor), and configured such that the piston moves from the raised position to the lowered position to cut a portion of the bus bar is disclosed (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] However, since the recessed portion of the piston disclosed in Patent Document 1 is thin, it is considered that the strength is correspondingly reduced. Therefore, for example, when the igniter generates gas, the pusher may be damaged.

[0005] Therefore, the present disclosure provides a cutoff device capable of suppressing damage to the pusher when the igniter generates gas.

[0006] A cutoff device according to one aspect of the present disclosure includes a housing, a pusher located inside the housing and having a recess, a lid portion that holds gunpowder inside and is provided between the gunpowder and the pusher, an igniter that is disposed in the recess and generates gas, a protection portion provided on the housing or the igniter and located inside the recess, and a conductor having a separation portion located below the pusher. When the pusher receives the pressure of the gas generated by the igniter, the pusher moves the separation portion downward. The lid portion has an opening configured to open when receiving the pressure of the gas. The lower end of the protection portion is located below the lower end of the lid portion.

[0007] A cutoff device according to one aspect of the present disclosure includes a housing, a pusher located inside the housing and having a recess, a lid portion that holds gunpowder inside and is provided between the gunpowder and the pusher, an igniter that is disposed in the recess and generates gas, a protection portion provided to cover the inner surface of the recess, and a conductor having a separation portion located below the pusher. When the pusher receives the pressure of the gas generated by the igniter, the pusher moves the separation portion downward.

[0008] According to one aspect of the present disclosure, it is possible to realize a cutoff device that can suppress damage to the pusher when the igniter generates gas.

Brief Description of the Drawings

[0009]

Figure 1A

Figure 1B

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 5C

Figure 5D

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0010] A cutoff device according to one aspect of the present disclosure includes a housing, a pusher located inside the housing and having a recess, a lid portion that holds gunpowder inside and is provided between the gunpowder and the pusher, an igniter that is disposed in the recess and generates gas, a protection portion provided on the housing or the igniter and located inside the recess, and a conductor having a separation portion located below the pusher. When the pusher receives the pressure of the gas generated by the igniter, the pusher moves the separation portion downward. The lid portion has an opening configured to open when receiving the pressure of the gas. The lower end of the protection portion is located below the lower end of the lid portion.

[0011] Thus, since the lower end of the protection portion is located below the lower end of the lid portion, when the opening opens downward under the pressure of the gas generated by the igniter, the opened opening contacts the protection portion, and the protection portion suppresses the opening from opening widely. That is, the protection portion serves as a barrier against the opening opening too widely, and can prevent the opened opening from contacting the recess of the pusher. Therefore, the cutoff device can prevent the pusher from being damaged due to the opening contacting when the igniter generates gas.

[0012] Also, for example, it is preferable that the protection portion has a first cylindrical portion connected to the housing and a second cylindrical portion located below the first cylindrical portion and having a smaller diameter than the first cylindrical portion.

[0013] Thereby, since the second cylindrical portion of the protection portion is located inside the first cylindrical portion, the thickness of the portion of the recess of the pusher corresponding to the second cylindrical portion can be made thicker than the case where the first cylindrical portion and the second cylindrical portion have the same diameter. That is, the strength of the pusher can be improved. Therefore, the cutoff device can further prevent the pusher from being damaged.

[0014] Also, for example, the recess of the pusher has a first portion having a larger diameter than the first cylindrical portion and a second portion located below the first portion and having a larger diameter than the second cylindrical portion, and it is preferable that the diameter of the first portion is larger than the diameter of the second portion.

[0015] As a result, the thickness of the second part of the concave portion can be made the wall thickness, so that the strength of the pusher can be improved compared to the case where the thickness of the second part is the same as that of the first part. Therefore, the cutoff device can more effectively prevent the pusher from being damaged.

[0016] Also, for example, it is preferable that the distance from the lower end of the lid portion to the lower end of the second cylindrical portion is the same as or longer than half the length of the notch provided in the opening of the lid portion.

[0017] As a result, since the second cylindrical portion is provided to a position below the surface of the lid portion by a length equal to or greater than half the length of the surface of the lid portion, it is possible to more reliably prevent the opening from contacting the pusher. Therefore, the cutoff device can more reliably prevent the pusher from being damaged.

[0018] Also, for example, it is preferable that the diameter of the opening below the protection portion is smaller than the diameter of the lid portion.

[0019] As a result, the pressure of the gas generated by the igniter can be concentrated, so that the amount of gunpowder can be reduced.

[0020] Also, for example, the housing is made of metal, the protection portion includes a metal member connected to the housing and a resin member disposed inside the metal member, the metal member includes the first cylindrical portion and the second cylindrical portion, and it is preferable that the vertical length from the upper end to the lower end of the resin member is greater than the vertical length from the lower end of the lid portion to the lower end of the second cylindrical portion.

[0021] As a result, when the igniter generates gas, the opening contacts the resin member, so that even when the opening is formed of metal, it is possible to prevent the opening and the housing from being electrically connected through the metal member. That is, the resin member can prevent the arc generated during cutoff from being electrically connected to the igniter through the housing.

[0022] Further, for example, the resin member has a first portion disposed inside the metal member, a second portion disposed outside the metal member, and a third portion connecting the first portion and the second portion, and the third portion is preferably located below the metal member.

[0023] Thereby, since the third portion is located below the metal member, it is possible to more reliably suppress the contact between the opening and the metal member after the igniter generates gas.

[0024] Further, for example, the protective portion has a resin portion and a metal portion, the resin portion and the metal portion are integrally formed, and the resin portion may cover a portion below the lid portion on the inner surface of the metal portion.

[0025] Thereby, compared with the case where the resin portion and the metal portion are separate bodies, the manufacturing process such as attaching the resin portion to the metal portion can be omitted, so that the manufacturing can be facilitated.

[0026] Further, for example, the distance from the lower end of the lid portion to the lower end of the resin portion is preferably the same as or greater than half the length of the cut provided in the opening of the lid portion.

[0027] Thereby, since the resin portion is provided to a position below at least half the length of the surface of the lid portion, it is possible to more reliably suppress the conduction between the opening and the housing through the metal portion after the igniter generates gas.

[0028] Further, for example, the resin member has a first portion disposed inside the metal member, a second portion disposed outside the metal member, and a third portion connecting the first portion and the second portion, and the third portion is preferably located below the metal member.

[0029] Thereby, since the third portion is located below the metal member, it is possible to more reliably suppress the contact between the opening and the metal member after the igniter generates gas.

[0030] Further, the cutoff device according to one aspect of the present disclosure includes a housing, a pusher located inside the housing and having a recess, a lid portion that holds gunpowder inside and is provided between the gunpowder and the pusher, an igniter that is disposed in the recess and generates gas, a protection portion provided so as to cover the inner surface of the recess, and a conductor having a separation portion located below the pusher. The pusher moves the separation portion downward under the pressure of the gas generated by the igniter.

[0031] Thereby, since the recess of the pusher is covered by the protection portion, when the opening opens downward under the pressure of the gas generated by the igniter, the opened opening contacts the protection portion, and contact with the recess of the pusher by the protection portion is suppressed. Therefore, the cutoff device can suppress damage to the pusher due to contact of the opening when the igniter generates gas.

[0032] Also, for example, it is preferable that the protection portion covers a portion below the lid portion among the inner surface of the recess.

[0033] Thereby, since the protection portion covers a portion of the pusher that may come into contact with the opening, damage to the pusher can be effectively suppressed.

[0034] Also, for example, the protection portion is a metal layer that covers the inner surface of the recess or an insulating layer different from the material of the pusher that covers the inner surface of the recess, and the protection portion is preferably located between the lid portion and the pusher.

[0035] Thereby, damage to the pusher can be suppressed by a metal layer or an insulating layer formed integrally with the pusher. Also, for example, when the protection portion is a metal layer, damage to the pusher can be more reliably suppressed, and when the protection portion is an insulating layer, conduction between the opening and the housing through the protection portion can be further suppressed.

[0036] Further, for example, the protection part is a metal member or an insulating member provided inside the recess, and it is preferable that the metal member or the insulating member is positioned between the lid part and the pusher.

[0037] Thereby, breakage of the pusher can be suppressed by a metal member or an insulating member that is separate from the pusher. Further, for example, when the protection part is a metal member, breakage of the pusher can be more reliably suppressed, and when the protection part is an insulating member, conduction between the opening and the housing through the protection part can be suppressed.

[0038] Further, for example, it is preferable that the protection part entirely covers the inner surface of the recess positioned below the lid part.

[0039] Thereby, since the protection part covers all (including substantially all) of the portion of the pusher where the opening may touch, breakage of the pusher can be more effectively suppressed.

[0040] Further, for example, when the gas is generated, the protection part may be configured to contact the lid part.

[0041] Thereby, the protection part can suppress the lid part from contacting the pusher, so breakage of the pusher can be suppressed.

[0042] Note that when the pusher receives the pressure of the gas generated by the igniter, it may separate the separation part from the conductor and move the separation part downward.

[0043] Hereinafter, each embodiment and the like will be specifically described with reference to the drawings.

[0044] Note that each of the embodiments described below shows inclusive or specific examples. The numerical values, shapes, components, arrangement positions and connection forms of the components, steps (processes), order of steps (processes), etc. shown in each of the following embodiments are merely examples and not intended to limit the present disclosure. Among the components in the following embodiments, the components not described in the independent claims are described as optional components.

[0045] Also, each figure is a schematic diagram and is not necessarily drawn precisely. Therefore, for example, the scales in each figure do not necessarily match. Also, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.

[0046] In this specification and the drawings, the X-axis, Y-axis, and Z-axis represent the three axes of a right-handed three-dimensional orthogonal coordinate system. In each of the embodiments, the Z-axis direction is the moving direction of the pusher. Also, in this specification, "plan view" means looking at the blocking device from the Z-axis direction, and "side" means a direction orthogonal to the Z-axis direction. In this specification, the Z-axis direction is also described as the vertical direction. However, in this specification, the vertical direction of the blocking device only shows the relative positional relationship of each element in the blocking device for the convenience of explaining each embodiment. For example, in this specification, the terms "above" and "below" do not refer to the upward (vertically upward) and downward (vertically downward) directions in absolute space recognition, but are used as terms defined by the relative positional relationship based on the moving direction of the pusher. Also, the posture when installing the blocking device is not limited to the direction shown in the drawings.

[0047] Also, in this specification, terms indicating the relationship between elements such as equal and parallel, terms indicating the shape of elements such as circle and trapezoid, as well as numerical values and numerical ranges are not expressions representing only strict meanings, but expressions meaning including substantially equivalent ranges, for example, a difference of about several percent (or about 10%).

[0048] Also, in this specification, ordinal numbers such as "first" and "second" do not mean the number or order of components, unless otherwise specified, and are used for the purpose of avoiding confusion and distinguishing between components of the same kind.

[0049] (Embodiment 1) Hereinafter, the cutoff device according to this embodiment will be described with reference to FIGS. 1A to 4B.

[0050] [1-1. Configuration of the Cutoff Device] First, the configuration of the cutoff device according to this embodiment will be described with reference to FIGS. 1A to 3C. FIG. 1A is a first perspective view showing the cutoff device 1 according to this embodiment. FIG. 1B is a second perspective view showing the cutoff device 1 according to this embodiment. FIG. 2 is a cross-sectional perspective view showing the cutoff device 1 according to this embodiment. FIG. 3A is a cross-sectional view showing the cutoff device 1 according to this embodiment.

[0051] When viewing FIG. 1A from the X-axis direction as the front view, it is a view of the cutoff device 1 in a state rotated about the Z-axis from the front view state. FIG. 1B is a view of the cutoff device 1 from an obliquely downward direction. Also, FIG. 2 is a perspective view showing a cross-section when the cutoff device 1 (in the initial state) when not performing the cutoff operation is cut by the YZ plane, and FIG. 3A is a front view showing a cross-section when the cutoff device 1 (in the initial state) when not performing the cutoff operation is cut by the YZ plane.

[0052] As shown in FIGS. 1A to 3A, the cutoff device 1 includes an igniter 10, an upper housing 20, a lower housing 30, a resin member 40, a conductor 50, a pusher 60, a protection part 80, and elastic members 90, 92, 94, 96. The cutoff device 1 is mounted on an object having an electric circuit, and operates in the event of an abnormality in the electric circuit, system, etc. inside the object to cut off the electric circuit, thereby preventing the damage caused by the abnormality from becoming large. The cutoff device 1 is mounted on, for example, a vehicle which is an example of the object, and is connected between a motor and a battery for driving the motor (for example, a lithium ion battery), and cuts off the electrical connection between the motor and the battery for driving the motor in an emergency such as an abnormality or an accident. Note that the object may be other than a vehicle, and examples include, but are not particularly limited to, home appliances, a solar power generation system, etc.

[0053] The igniter 10 holds gunpowder inside, has a lid part 11 provided between the gunpowder and the pusher 60, is disposed in the recess 61, and generates gas. For example, the igniter 10 is an electric igniter having a gunpowder part having an ignition charge and a conductive pin for energizing the gunpowder part. During operation, an operating current for igniting the ignition charge is supplied to the conductive pin from an external power source, thereby igniting and burning the ignition charge and generating gas (combustion gas). Note that by forming the recess 61, the cutoff device 1 can be miniaturized.

[0054] The igniter 10 is fixed to the small-diameter part 21 above the upper housing 20.

[0055] Here, the lid part 11 will be further described with reference to FIGS. 3B and 3C. FIG. 3B is a perspective view showing a part of the igniter 10 according to the present embodiment before generating gas. FIG. 3C is a plan view of the lid part 11 and the protection part 80 of the igniter 10 according to the present embodiment as viewed from below before generating gas. FIG. 3C shows a schematic view when the lid part 11 (opening part 11a and outer frame part 11b) and the second cylindrical part 82 are viewed in the direction from the negative Z-axis side to the positive Z-axis side. "Before generating gas" means "before the cutoff operation".

[0056] As shown in FIGS. 3B and 3C, the lid portion 11 has an opening 11a and an outer frame portion 11b. In FIG. 3C, the cut 11a1 is schematically shown by a broken line. The lid portion 11 is formed of metal but is not limited thereto.

[0057] The opening 11a is arranged so as to be openable toward the minus Z-axis side, and is a portion that opens downward under the pressure of the gas. The opening 11a is, for example, planar, but may be curved or the like. Further, a cut 11a1 (groove) is formed in the opening 11a so as to facilitate opening.

[0058] In FIGS. 3B and 3C, the cut 11a1 is configured not to be in contact with the outer frame portion 11b, but the cut 11a1 may be configured to be in contact with the outer frame portion 11b.

[0059] The outer frame portion 11b is a cylindrical member that surrounds the opening 11a in a plan view.

[0060] Note that the lid portion 11 may be covered with resin or the like. That is, the lid portion 11 and the protection portion 80 may be electrically insulated in the initial state.

[0061] The length L2 shown in FIG. 3C is half the length of the cut 11a1 of the opening 11a. Note that the length L2 may be the same as half the diameter of the opening 11a.

[0062] Note that the shape of the opening 11a in a plan view is not limited to a circular shape, and may be an elliptical shape, a rectangular shape, or the like.

[0063] Referring back to FIGS. 1A to 2, the upper housing 20 and the lower housing 30 are members that constitute the outer shell of the cutoff device 1, and house a part of the igniter 10, the resin member 40, and the conductor 50, the pusher 60, and the protection unit 80. Further, inside the upper housing 20 and the lower housing 30, a space 70 extending in the vertical direction is formed. The space 70 is a cylindrical space formed so that the pusher 60 can move. The pusher 60 is housed on the upper end side (Z-axis positive side) in the vertical direction (Z-axis direction) of the space 70.

[0064] The upper housing 20 and the lower housing 30 are each formed of a metal such as stainless steel (SUS), but may be formed of other metals such as aluminum. Further, the upper housing 20 and the lower housing 30 have a cylindrical outer shape, but the shape is not limited to this. Further, the upper housing 20 and the lower housing 30 are fixed using fastening members such as screws and rivets. The upper housing 20 and the lower housing 30 are an example of a housing.

[0065] The upper housing 20 is, for example, a stepped cylindrical cylinder member with a hollow inside. The upper housing 20 has a small-diameter portion 21 located above, a large-diameter portion 23 located below, and a connecting portion 22 connecting these. The small-diameter portion 21 and the large-diameter portion 23 are coaxially arranged, and the large-diameter portion 23 has a larger diameter than the small-diameter portion 21.

[0066] The lower housing 30 is a member having a bottomed cylindrical shape with a hollow inside, and has a convex portion 30a protruding upward. Specifically, the lower housing 30 has a convex portion 30a, a bottom portion 33, and a side wall portion 34. The convex portion 30a, the bottom portion 33, and the side wall portion 34 are integrally formed.

[0067] In this specification, integrally formed means that at least one of the following holds: each component is formed of the same material, is formed simultaneously, and is the same object (single object).

[0068] The convex portion 30a is located below the separation portion 51 and is configured to protrude upward in the space 70. The convex portion 30a is connected to one end of the bottom portion 33 and protrudes upward (toward the positive Z-axis side) from the bottom portion 33 in the space 70. The convex portion 30a is configured to contact the pusher 60 that has moved downward due to the gas generated by the igniter 10 via the conductor 50 and be deformed downward by being pressed by the pusher 60. That is, the convex portion 30a has a function of absorbing the impact (stress) from the pusher 60 by being deformed.

[0069] Further, when the cutoff device 1 is viewed from the negative Z-axis side toward the positive Z-axis side, the convex portion 30a that forms the recess of the lower housing 30 is exposed when viewed from the outside of the cutoff device 1. In the present embodiment, the convex portion 30a has a tapered shape as it goes upward in the space 70, but the shape is not limited to this.

[0070] The bottom portion 33 connects the convex portion 30a and the side wall portion 34. In other words, the convex portion 30a and the side wall portion 34 are connected via the bottom portion 33. The outer surface and the inner surface of the bottom portion 33 are each inclined upward from the convex portion 30a toward the side wall portion 34.

[0071] The side wall portion 34 is connected to the other end of the bottom portion 33 and is formed to extend upward from the bottom portion 33. The side wall portion 34 has a cylindrical shape and has a cylindrical shape in the present embodiment. The side wall portion 34 is arranged coaxially with the small-diameter portion 21 and the large-diameter portion 23. The side wall portion 34 has, for example, the same diameter as the large-diameter portion 23.

[0072] In the present embodiment, the thicknesses of the convex portion 30a, the bottom portion 33, and the side wall portion 34 are the same, but they may be different from each other, for example.

[0073] The resin member 40 is a member that covers a part of the conductor 50. Further, the resin member 40 is a part of the component that forms the space 70. The resin member 40 has a buried portion 41, a first cylindrical portion 42, and a second cylindrical portion 43.

[0074] The embedding part 41 is the part of the resin member 40 where the conductor 50 is embedded. The embedding part 41, for example, has a part exposed from the housing. A through hole in which the conductor 50 (specifically, the holding part 52) is arranged is formed in the embedding part 41.

[0075] The first cylindrical part 42 is the part of the resin member 40 arranged inside the housing. When the blocking operation is not performed (when gas is not generated by the igniter 10), the pusher 60 is arranged inside. The inner diameter of the first cylindrical part 42 is smaller than that of the second cylindrical part 43. Note that the position of the pusher 60 shown in FIGS. 2 and 3A indicates the initial position when the blocking operation is not performed.

[0076] The second cylindrical part 43 is the part of the resin member 40 arranged inside the housing and is located below the first cylindrical part 42. The inner diameter of the second cylindrical part 43 is larger than that of the first cylindrical part 42. Thereby, the volume on the lower side in the space 70 can be widened. Therefore, the gas generated by the igniter 10 and the increase in the pressure inside the housing due to the movement of the pusher 60 caused thereby can be suppressed, and the deformation of the blocking device 1 can be suppressed.

[0077] In this way, the pusher 60 moves within the space 70 formed by the first cylindrical part 42 and the second cylindrical part 43. Note that the first cylindrical part 42 and the second cylindrical part 43 are not limited to having different inner diameters, and their inner diameters may be the same.

[0078] The conductor 50 is a conductive metal body, a part of which is located inside the upper housing 20 and the lower housing 30. Also, when the blocking device 1 is attached to a predetermined electric circuit, the conductor 50 forms a part of the electric circuit and is also referred to as a bus bar. The conductor 50 is a flat member held by the resin member 40 and arranged so as to cross the inside of the upper housing 20 and the lower housing 30. The conductor 50 has a separation part 51 and a holding part 52.

[0079] The conductor 50 can be formed of a metal such as copper (Cu), for example. However, the conductor 50 may be formed of a metal other than copper or may be formed of an alloy of copper and another metal. For example, the conductor 50 may be configured to include manganese (Mn), nickel (Ni), platinum (Pt), etc.

[0080] The separation part 51 is a part of the conductor 50 that is separated by the pusher 60 that has received the pressure of the gas generated by the igniter 10, and is located below the pusher 60 in the initial position.

[0081] The holding part 52 is a part of the conductor 50 that is held by the resin member 40. The holding part 52 is a part that does not overlap with the pusher 60 in a plan view, and is, for example, a part that overlaps with the resin member 40 and a part that is located outside the housing in a plan view. The holding part 52 maintains the state of being held by the resin member 40 even after the separation part 51 is separated.

[0082] The pusher 60 is located below the igniter 10 and is arranged to be movable downward. When an abnormality occurs in the system or the like, it moves downward to cut the conductor 50 and emergently cut off the conduction in the electric circuit. In this way, the pusher 60 is configured to separate the separation part 51 from the conductor 50 by receiving the pressure of the gas generated by the igniter 10.

[0083] The pusher 60 is formed of an insulating member such as synthetic resin, for example. In the present embodiment, the pusher 60 is formed of nylon. The pusher 60 has a cylindrical shape and has an outer diameter corresponding to the inner diameter of the small-diameter part 21 of the upper housing 20. Further, the pusher 60 has a recess 61, and the igniter 10 is arranged inside the recess 61. Note that the shape of the pusher 60 is not limited to the above, and can be appropriately changed according to the shapes of the upper housing 20 and the lower housing 30, etc. The recess 61 is an upper part of the pusher 60 and is a part where a recess is provided downward.

[0084] Also, in the example of Fig. 2, the recess 61 is a portion where the side surface is surrounded by the small-diameter portion 21 and the connection portion 22 in a state where the cutoff device 1 is not performing a cutoff operation (the state shown in Fig. 2).

[0085] In plan view, the recess 61 has a first portion 62 with a diameter (e.g., inner diameter) larger than that of the first cylindrical portion 81 of the protection portion 80, and a second portion 63 located below the first portion 62 and having a diameter (e.g., inner diameter) larger than that of the second cylindrical portion 82. In plan view, the diameter of the first portion 62 is larger than the diameter of the second portion 63. For example, in a cross-sectional view, the inner wall of the first portion 62 is tapered such that the diameter decreases toward the second portion 63, but it may be stepped, for example, where the diameter decreases step by step.

[0086] The protection portion 80 is a component for suppressing the pusher 60 from being damaged by the opening 11a of the igniter 10 when the igniter 10 generates gas. Specifically, the protection portion 80 serves as a barrier against the opening 11a opening too wide, thereby suppressing the opening 11a opened by the igniter 10 generating gas from contacting the pusher 60 and damaging the recess 61 of the pusher 60.

[0087] The protection portion 80 is provided on the housing (e.g., the upper housing 20) or the igniter 10 and has a portion located inside the recess 61. In the present embodiment, the protection portion 80 is provided on the housing (specifically, the small-diameter portion 21). The protection portion 80 is fixed to the small-diameter portion 21 by welding, for example, but the fixing method is not limited to this.

[0088] As shown in Fig. 3A and the like, the protection portion 80 has a first cylindrical portion 81 and a second cylindrical portion 82. The first cylindrical portion 81 and the second cylindrical portion 82 are integrally formed.

[0089] The first cylindrical portion 81 is a cylindrical portion surrounding the side of the igniter 10 and has a shape along the igniter 10. In the present embodiment, the first cylindrical portion 81 is formed in a stepped shape (for example, a two-step stepped shape) in which the diameter (for example, the inner diameter) gradually decreases downward in a cross-sectional view. Note that the shape of the first cylindrical portion 81 is not limited to this. For example, the first cylindrical portion 81 may be tapered such that the diameter decreases downward, or may have other shapes.

[0090] The first cylindrical portion 81 may be in contact with at least a part of the igniter 10. A second cylindrical portion 82 is disposed below the first cylindrical portion 81.

[0091] Further, the first cylindrical portion 81 has a flange portion 83 at the upper part. The flange portion 83 is an annular portion (for example, a plate-like member) formed to protrude outward in a plan view from the upper end of the first cylindrical portion 81 and is fixed to the small-diameter portion 21 by welding or the like. The flange portion 83 is disposed, for example, at least partly between the first portion 62 and the small-diameter portion 21. Thus, the first cylindrical portion 81 has a portion connected to the housing and is fixed to the housing.

[0092] The second cylindrical portion 82 is located below the first cylindrical portion 81 and is an annular portion having a smaller diameter (for example, inner diameter) than the first cylindrical portion 81. The second cylindrical portion 82 protrudes linearly from the lower end of the first cylindrical portion 81 toward the negative Z-axis side and is a portion that contacts the lid portion 11 when gas is generated. The lower end of the second cylindrical portion 82 (the end on the negative Z-axis side, for example, the lowermost end) is located below (on the negative Z-axis side) the lower end (the end on the negative Z-axis side, for example, the lowermost end) of the lid portion 11 (see FIG. 3A) in a state where no gas is generated. For example, as shown in FIG. 3A, the length L1 from the lower end of the lid portion 11 to the lower end of the second cylindrical portion 82 in the second cylindrical portion 82 is the same as or longer than the length L2 of the cut 11a1 of the lid portion 11. Further, the second cylindrical portion 82 is not in contact with the pusher 60.

[0093] The protection part 80 is formed of a metal such as stainless steel (SUS), for example, but may be formed of other metals such as aluminum, or may be formed of a resin (for example, a resin different from the pusher 60).

[0094] As shown in FIG. 2 and the like, the elastic members 90, 92, 94, and 96 are members having elasticity such as rubber and are O-rings formed in an annular shape.

[0095] The elastic member 90 is disposed in a space formed between the fixing member 100 for fixing the igniter 10 disposed in the concave portion 61, the igniter 10, and the small-diameter portion 21. The elastic member 90 is in contact with each of the fixing member 100, the igniter 10, and the small-diameter portion 21, and is pressed by each of the fixing member 100, the igniter 10, and the small-diameter portion 21, for example.

[0096] The elastic member 92 is disposed in a space formed between the housing (for example, the connecting portion 22), the pusher 60, and the resin member 40 in order to suppress the spatial connection between the internal space of the concave portion 61 and the conductor 50. The elastic member 92 suppresses the gas generated by the igniter 10 from reaching the conductor 50. In the present embodiment, the elastic member 92 is in contact with the housing, the pusher 60, and the resin member 40, and is pressed by each of the housing, the pusher 60, and the resin member 40, for example.

[0097] The elastic member 94 is disposed in a space formed between a circumferential concave portion formed in the resin member 40 above the conductor 50 and the housing (for example, the large-diameter portion 23) above the conductor 50 in order to suppress the spatial connection between the space above the conductor 50 and the external space. In the present embodiment, the elastic member 94 is in contact with each of the resin member 40 and the large-diameter portion 23, and is pressed by each of the resin member 40 and the large-diameter portion 23, for example.

[0098] The elastic member 96 is disposed in a space formed between a circumferential recess formed in the resin member 40 and the lower housing 30 (for example, the side wall portion 34) below the conductor 50 in order to suppress the spatial connection between the space below the conductor 50 and the external space. In the present embodiment, the elastic member 96 is in contact with each of the resin member 40 and the side wall portion 34, and is pressed by, for example, each of the resin member 40 and the side wall portion 34.

[0099] Note that the elastic members 94 and 96 are not limited to being disposed in the circumferential recess without a gap, and a gap may be formed in at least one of the vertical directions.

[0100] [1-2. Interruption operation] Subsequently, the interruption operation in the interruption device 1 configured as described above will be described with reference to FIGS. 4A and 4B. FIG. 4A is a cross-sectional view for explaining the interruption operation of the interruption device 1 according to the present embodiment. FIG. 4A shows the cross-sectional configuration after the interruption operation of the interruption device 1. FIG. 4B is a perspective view showing a part of the lid portion 11 of the igniter 10 according to the present embodiment after generating gas.

[0101] In FIGS. 4A and 4B, for the sake of convenience, the opening 11a is shown in a state of being opened along the Z-axis direction, and shows the state when the opening 11a reaches the lowest position. Therefore, in FIG. 4A, the opening 11a and the protection portion 80 are not in contact with each other in the figure, but actually the opening 11a opens so as to be in contact with the second cylindrical portion 82. Further, in FIG. 4B, an ideal opening state in which the opening 11a is cut along the cut 11a1 when gas is generated is shown, but in an actual product, the opening 11a is not necessarily neatly cut along the cut 11a1. The state in which the opening 11a opens can vary depending on, for example, the amount of gunpowder.

[0102] As shown in FIG. 4A, when the igniter 10 operates, the pusher 60 moves downward at high speed from the initial position shown in FIG. 3A by the energy from the igniter 10 pressing on its upper surface (pressure-receiving surface), separates the separation part 51 from the holding part 52, moves further downward at high speed integrally with the separated separation part 51, and the separation part 51 contacts the convex part 30a. Thereby, the pusher 60 can forcibly and physically cut the conductor 50.

[0103] Also, the convex part 30a is pushed by the pusher 60 and deforms downward. Thereby, by the deformation of the convex part 30a, the impact (stress) from the pusher 60 can be absorbed. Also, even when the pusher 60 moves further downward, a part of the pusher 60 (for example, at least a part of the concave part 61) is located above the cut surface 53. Thereby, the insulation distance between the cut surfaces 53 of the conductor 50 can be increased, so that the generation of an arc when the conductor 50 is interrupted can be suppressed.

[0104] The length L1 shown in FIGS. 4A and 3C is the distance from the lower end of the lid part 11 to the lower end of the protection part 80. Also, as described above, the length L2 is half the length of the cut 11a1 of the opening 11a. The length L2 is less than or equal to the length L1. From this length relationship, when the opening 11a opens downward, the protection part 80 serves as a barrier against the opening 11a opening too large, and it is suppressed that the opened opening 11a contacts the concave part 61 of the pusher 60.

[0105] Note that, as shown in FIG. 4A, the protection part 80 remains stationary during the interruption operation and does not move with the pusher 60.

[0106] (Various Modification Examples of Embodiment 1) Hereinafter, various modification examples applicable to Embodiment 1 will be described with reference to FIGS. 5A to 5D. Note that hereinafter, the description will focus on the differences from Embodiment 1, and the description of the same or similar content as Embodiment 1 will be omitted or simplified.

[0107] Figs. 5A to 5D are cross-sectional views showing the cutoff devices according to each modification example of Embodiment 1. The cutoff devices shown in Figs. 5A to 5D differ from the cutoff device 1 according to Embodiment 1 in the shape of the protection part and the like.

[0108] As shown in Fig. 5A, the protection part 80a of the cutoff device 1a has a first cylindrical part 81a and a second cylindrical part 82a.

[0109] The first cylindrical part 81a is a cylindrical part that surrounds the side of the igniter 10, and at least a part thereof has a shape along the igniter 10. In the present embodiment, the first cylindrical part 81a is formed in a stepped shape (a single-step stepped shape) in which the diameter (for example, the inner diameter) gradually decreases downward in a cross-sectional view.

[0110] The second cylindrical part 82a is located below the first cylindrical part 81a and is a cylindrical part having a smaller diameter (for example, the inner diameter) than the first cylindrical part 81a. The second cylindrical part 82a protrudes linearly from the lower end of the first cylindrical part 81a toward the negative Z-axis side, and the length of the second cylindrical part 82a in the Z-axis direction is, for example, longer than the length of the first cylindrical part 81a in the Z-axis direction. Further, the lower end of the second cylindrical part 82a (the end on the negative Z-axis side, for example, the lowermost end) is located below (on the negative Z-axis side) the lower end of the lid part 11 (see Fig. 3A) in a state where no gas is generated (the end on the negative Z-axis side, for example, the lowermost end).

[0111] The protection part 80a configured in this way is easy to manufacture because the number of steps of the stepped shape of the first cylindrical part 81a is smaller than the number of steps of the igniter 10 and the linear part is long.

[0112] Further, the recess 61a has a first part 62 and a second part 64.

[0113] The first part 62 is a part where the diameter (for example, the inner diameter) gradually decreases downward with a predetermined curvature.

[0114] The second part 64 is located below the first part 62 and, in a cross-sectional view, is a part where the inner surface is parallel to the Z-axis direction. The second part 64 is provided so as to face at least a part of the second cylindrical part 82a in a cross-sectional view.

[0115] The shape of the concave part 61a may be a shape corresponding to the shape of the protection part 80a.

[0116] As shown in FIG. 5B, the protection part 80b of the cutoff device 1b has a first cylindrical part 81 and a second cylindrical part 82b.

[0117] The second cylindrical part 82b is located below the first cylindrical part 81 and is a cylindrical part having a smaller diameter (for example, inner diameter) than the first cylindrical part 81. The second cylindrical part 82b protrudes from the lower end of the first cylindrical part 81 toward the minus Z-axis side and has an inclined part 82b1 whose lower end part inclines inward. It can also be said that the lower end part of the second cylindrical part 82b bends inward. The shape, orientation, etc. of the inclined part 82b1 are not particularly limited as long as it protrudes inward so as to be inclined with respect to the Z-axis direction in a cross-sectional view.

[0118] The opening diameter (length L3) below the second cylindrical part 82b is smaller than, for example, the length (2 × L2) of the cut 11a1 (see FIG. 3C). The length L3 is the shortest distance between the tips of the inclined parts 82b1. The diameter of the opening 11a corresponds to the diameter of the lid part 11.

[0119] The second cylindrical part 82b is, for example, a part that comes into contact with the lid part 11 when gas is generated. Also, the lower end (the end on the minus Z-axis side of the second cylindrical part 82b, for example, the lowermost end) is located below (on the minus Z-axis side) the lower end (the end on the minus Z-axis side of the lid part 11 in a state where no gas is generated, for example, the lowermost end).

[0120] In this way, since the protection part 80b has the inclined part 82b1, the pressure of the gas generated by the igniter 10 can be concentrated more inward, so the amount of gunpowder can be reduced.

[0121] Further, the recess 61b has a first part 62 and a second part 65.

[0122] The second part 65 is located below the first part 62 and has a shape (curved shape) along the second cylindrical part 82b. For example, the second part 65 has a shape along the inclined part 82b1, and compared with the case where the second cylindrical part 82b is formed only by a linear part, the thickness in the direction orthogonal to the Z-axis of the part of the second part 65 corresponding to the inclined part 82b1 can be increased. Thereby, the strength of the recess 61 of the pusher 60 can be enhanced.

[0123] As shown in FIG. 5C, the protection part 80c of the cutoff device 1c has a metal part 110 and a resin part 112. The protection part 80c has a double structure of the metal part 110 and the resin part 112. The configuration of the metal part 110 is the same as the configuration of the above-described protection part 80, and the description thereof is omitted. Note that the metal part 110 and the resin part 112 are integrally formed, for example. The resin part 112 may be formed, for example, by coating or the like on the inner surface of the metal part 110. The resin part 112 may be formed by coating or the like on the surface of the metal part 110. Note that integrally formed means that two elements are formed as one body, and it means that one is detachably attached to the other.

[0124] Note that the metal part 110 and the resin part 112 are not limited to being integrally formed, and they may be separate bodies and one may be detachably attached to the other. When the metal part 110 and the resin part 112 are detachable (separate members), the metal part 110 is an example of a metal member, and the resin part 112 is an example of a resin member. The resin member is, for example, a sheet-like member made of resin and may be arranged along the metal member. Note that detachable means that the metal part 110 and the resin part 112 are connected in such a manner that they can be attached and detached without being accompanied by breakage or plastic deformation.

[0125] The resin part 112 covers the lower part of the inner surface of the metal part 110 than the lid part 11. In the present embodiment, the resin part 112 covers the entire inner surface of the metal part 110. Further, the distance from the lower end of the lid part 11 to the lower end of the resin part 112 (here, the length L1) is the same as or larger than half the size of the opening 11a of the lid part 11. In the example of FIG. 5C, the distance from the lower end of the lid part 11 to the lower end of the resin part 112 is equal to the distance from the lower end of the lid part 11 to the lower end of the metal part 110, for example, the length L1. Further, the vertical length from the upper end to the lower end of the resin part 112 is the length L4.

[0126] As shown in FIG. 5D, the protection part 80d of the cutoff device 1d has a metal part 110 and a resin part 120.

[0127] The resin part 120 covers the lower part of the inner surface of the metal part 110 than the lid part 11. In the present embodiment, the resin part 120 is fitted and fixed to the metal part 110 so as to cover the lower end part (tip part) of the metal part 110. The inner surface of the resin part 120 contacts the outer surface of the metal part 110. The metal part 110 is an example of a metal member, and the resin part 120 is an example of a resin member.

[0128] The resin part 120 has a first part 121 disposed inside the metal part 110, a second part 122 disposed outside the metal part 110, and a third part 123 connecting the first part 121 and the second part 122. At least a part of the third part 123 is located below the metal part 110. That is, the lower end of the metal part 110 is not exposed. The resin part 120 is a cap-shaped member, and the cross-sectional shape is, for example, U-shaped.

[0129] Further, the vertical length from the upper end to the lower end of the first part 121 may be larger than, for example, the vertical length from the lower end of the lid part 11 to the lower end of the second cylindrical part 82. Further, the vertical length from the upper end to the lower end of the second part 122 may be smaller than, for example, the vertical length from the lower end of the lid part 11 to the lower end of the second cylindrical part 82.

[0130] Note that the resin part 120 may be formed by coating or the like so as to cover from the inside to the outside of the lower end part of the metal part 110.

[0131] (Manufacturing method) Next, a manufacturing method of the cutoff device according to the first embodiment configured as described above and its various modifications will be described with reference to FIG. 6. FIG. 6 is a flowchart showing the manufacturing process of the cutoff device 1 according to the first embodiment. In FIG. 6, the manufacturing process of the cutoff device 1 according to the first embodiment is shown.

[0132] As shown in FIG. 6, the upper housing 20 is manufactured by molding or the like (S10), and the lower housing 30 is manufactured by molding or the like (S20). Note that step S10 may be performed after step S20.

[0133] In step S10, the protection part 80 is further provided on the upper housing 20. For example, the protection part 80 is fixed to the upper housing 20 by welding or the like. Also, in step S20, the convex part 30a is formed simultaneously when the lower housing 30 is molded.

[0134] Next, the upper housing 20 and the lower housing 30 are fixed (S30). For example, with the igniter 10, the resin member 40, the conductor 50, the pusher 60, and the protection part 80 housed inside, the upper housing 20 and the lower housing 30 are fixed without a gap by a fastening member or the like. Thereby, the above-mentioned cutoff device 1 is manufactured.

[0135] (Second embodiment) Hereinafter, the cutoff device according to the present embodiment will be described with reference to FIG. 7. Note that hereinafter, the description will focus on the differences from the first embodiment, and the description of the same or similar contents as those in the first embodiment will be omitted or simplified.

[0136] FIG. 7 is a cross-sectional view showing the cutoff device 2 according to the present embodiment. The cutoff device 2 according to the present embodiment is different from the cutoff device 1 according to the first embodiment in that the protection part 130 is provided on the pusher 60 side.

[0137] As shown in FIG. 7, the cutoff device 2 according to the present embodiment includes a protection unit 130 instead of the protection unit 80 of the cutoff device 1 according to the first embodiment.

[0138] The protection unit 130 is provided so as to cover the inner surface of the concave portion 61 of the pusher 60. The protection unit 130 may be provided, for example, in contact with and covering the inner surface of the concave portion 61. The protection unit 130 may be provided, for example, to cover the lower part of the inner surface of the concave portion 61 than the lid portion 11. For example, the protection unit 130 may be provided to cover all of the inner surface of the concave portion 61 located below the lid portion 11. Further, the protection unit 130 may be provided, for example, between the lid portion 11 and the pusher 60. Note that covering all of the inner surface here includes not only completely covering all of the inner surface but also substantially covering all of the inner surface (for example, covering 80% or more of the surface area of the inner surface).

[0139] The protection unit 130 is a metal layer formed of metal or an insulating layer formed of a material having insulating properties. When the protection unit 130 is, for example, a metal layer, it is formed of a metal such as stainless steel (SUS), but may be formed of other metals such as aluminum. Since the protection unit 130 is a metal layer, the strength of the protection unit 130 can be improved, so that breakage of the pusher 60 can be more reliably suppressed. Further, when the protection unit 130 is, for example, an insulating layer, it may be formed of a material different from that of the pusher 60. For example, when the protection unit 130 is an insulating layer, it may be formed of a material harder than the pusher 60. The insulating layer may be formed of silicon oxide such as SiO2, silicon nitride such as SiN, or silicon oxynitride such as SiON. Since the protection unit 130 is an insulating layer, conduction between the opening 11a and the housing via the protection unit 130 can be suppressed.

[0140] The protection unit 130 is integrally formed with the pusher 60, for example, by coating the inner surface of the concave portion 61.

[0141] Note that the protection part 130 is not limited to being formed integrally with the pusher 60, and may be a separate body. The protection part 130 may be, for example, a separate body having a shape along the inner surface of the recess 61. For example, the protection part 130 may be placed on the inner surface of the recess 61 or arranged at a distance from the inner surface of the recess 61. In the former case, the inner surface of the recess 61 and the protection part 130 are, for example, in surface contact.

[0142] Thus, when the protection part 130 and the pusher 60 are not integrally formed, the protection part 130 is an example of a metal member formed of a metal layer or an insulating member formed of an insulating layer different from the material of the pusher 60. That is, the protection part 130 is a metal member or an insulating member provided inside the recess 61, and the metal member or the insulating member may be provided so as to be located between the lid part 11 and the pusher 60.

[0143] Note that the protection part 130 may have a double structure in which an insulating layer is formed above the metal layer.

[0144] In the present embodiment, the protection part 130 moves downward together with the pusher 60 by the blocking operation.

[0145] Also in such a blocking device 2, similar to the first embodiment, the protection part 130 can prevent the opening 11a opened by the igniter 10 generating gas from contacting the pusher 60 and damaging the recess 61 of the pusher 60.

[0146] (Configuration of Another Blocking Device) A blocking device with a different structure of the separation part 51 will be described with reference to FIGS. 8 and 9. FIG. 8 is a cross-sectional view showing a blocking device according to another embodiment. FIG. 9 is a cross-sectional view for explaining a state in which the separation part of the blocking device according to another embodiment shown in FIG. 8 has moved downward.

[0147] For FIGS. 8 and 9, the same components as those of the above-described blocking devices 1, 1a, 1b, 1c, 1d, and 2 are denoted by the same reference numerals, and the description thereof is omitted.

[0148] In the above-described cutoff device 1, upon receiving the pressure of the gas generated by the igniter 10, the pusher 60 separates the separation part 51 from the conductor 50, causing the separation part 51 to move downward. That is, by separating the separation part 51 from the holding part 52, the space between the separation part 51 and the holding part 52 becomes non-conductive, and as a result, the conductor 50 becomes non-conductive. However, the cutoff device of the present disclosure does not necessarily need to be configured to separate the separation part 51.

[0149] For example, as shown in FIGS. 7 and 8, upon receiving the pressure of the gas generated by the igniter 10, the pusher 60 may move the separation part downward to render the conductor 50 non-conductive. That is, by moving the separation part 51 in contact with the holding part 52 downward to separate the separation part 51 from the holding part 52, the conductor 50 may be rendered non-conductive.

[0150] (Other embodiments) As described above, the cutoff device according to one or more aspects has been described based on each embodiment and the like. However, the present disclosure is not limited to these embodiments and the like. As long as the gist of the present disclosure is not deviated from, various modifications conceived by those skilled in the art applied to this embodiment, or forms constructed by combining components in different embodiments may also be included in the present disclosure.

[0151] For example, in each of the above embodiments and the like, an example in which the housing is made of metal has been described. However, it is not limited thereto. For example, the lower housing of the housing may be made of a resin having deformable characteristics.

[0152] Also, the cutout patterns (number, shape, etc.) shown in FIGS. 3B and 3C in the above-described Embodiment 1 are merely examples and are not limited thereto as long as the lid part assumes a desired opening state. Also, the cutout may not be provided in the lid part. Further, in FIG. 4B, only the portion of the cutout 11a1 of the opening 11a is torn, but in an actual product, the tear may reach the outer frame part 11b. That is, the opening 11a of the actual product may be larger than the opening 11a shown in FIG. 4B.

[0153] In addition, in each of the above-described embodiments, etc., the lower end portion of the protection portion may be bent outward as long as it does not contact the pusher. "Outward" means the direction from the inside of the cutoff device toward the outside of the cutoff device in a plan view of the cutoff device.

[0154] Also, the order of each step in the manufacturing method of the cutoff device described in each of the above-described embodiments, etc., may be changed. Further, each step in the manufacturing method of the cutoff device described in the above embodiment may be carried out in one step or in separate steps. Note that "being carried out in one step" means that each step is carried out using one device, each step is carried out continuously, or each step is carried out at the same location. Also, "separate steps" means that each step is carried out using separate devices, each step is carried out at different times (e.g., different days), or each step is carried out at different locations.

Industrial Applicability

[0155] The present disclosure is useful for a cutoff device disposed in an electric circuit or the like.

Explanation of Signs

[0156] 1, 1a, 1b, 1c, 1d, 2 Cutoff device 10 Igniter 11 Lid portion 11a Opening 11a1 Notch 11b Outer frame portion 20 Upper housing 21 Small-diameter portion 22 Connection portion 23 Large-diameter portion 30 Lower housing 30a Protrusion 33 Bottom portion 34 Side wall portion 40 Resin member 41 Embedded portion 42, 81, 81a First cylindrical portion 43, 82, 82a, 82b Second cylindrical portion 50 Conductor 51 Separation part 52 Holding part 53 Cutting surface 60 Pusher 61, 61a, 61b Recess 62 First part 63, 64, 65 Second part 70 Space 80, 80a, 80b, 80c, 80d, 130 Protection part 82b1 Inclined part 83 Flange part 90, 92, 94, 96 Elastic member 100 Fixing member 110 Metal part (metal member) 112, 120 Resin part (resin member) 121 First portion 122 Second portion 123 Third portion L1, L2, L3, L4 Length

Claims

1. A housing, a pusher located inside the housing and having a recess, an igniter that holds gunpowder inside and has a lid provided between the gunpowder and the pusher, is disposed within the recess, and generates gas, a protection part provided on the housing or the igniter and located inside the recess, a conductor having a separation part located below the pusher, comprising: when the pusher receives the pressure of the gas generated by the igniter, it moves the separation part downward, the lid has an opening configured to open when receiving the pressure of the gas, the lower end of the protection part is located below the lower end of the lid a cutoff device.

2. The protection part is a first cylindrical part connected to the housing, a second cylindrical part located below the first cylindrical part and having a smaller diameter than the first cylindrical part, having the cutoff device according to Claim 1.

3. The recess of the pusher is a first part having a larger diameter than the first cylindrical part, a second part located below the first part and having a larger diameter than the second cylindrical part, having the diameter of the first part is larger than the diameter of the second part the cutoff device according to Claim 2.

4. The distance from the lower end of the lid to the lower end of the second cylindrical part is the same as, or longer than, half the length of the cut provided in the opening of the lid the cutoff device according to Claim 2 or 3.

5. The diameter of the opening below the protection part is smaller than the diameter of the lid the cutoff device according to Claim 2 or 3.

6. The housing is made of metal, the protection part is a metal member connected to the housing, a resin member disposed inside the metal member, having the metal member includes the first cylindrical part and the second cylindrical part, the vertical length from the upper end to the lower end of the resin member is larger than the vertical length from the lower end of the lid to the lower end of the second cylindrical part the cutoff device according to Claim 2 or 3.

7. The resin member is a first part disposed inside the metal member, a second part disposed outside the metal member, a third part connecting the first part and the second part, having the third part is located below the metal member the cutoff device according to Claim 6.

8. The protection part has a resin part and a metal part, the resin part and the metal part are integrally formed, the resin part covers the part below the lid among the inner surfaces of the metal part The cutoff device according to claim 2 or 3.

9. The distance from the lower end of the lid portion to the lower end of the resin portion is the same as or greater than half the length of the notch provided in the opening of the lid portion. The cutoff device according to claim 8.

10. The resin portion has a first portion disposed inside the metal portion, a second portion disposed outside the metal portion, and a third portion connecting the first portion and the second portion, and the third portion is located below the metal portion. The cutoff device according to claim 8.

11. A housing, a pusher located inside the housing and having a recess, an igniter that holds gunpowder inside and has a lid portion provided between the gunpowder and the pusher, is disposed in the recess, and generates gas, a protection portion provided so as to cover the inner surface of the recess, and a conductor having a separation portion located below the pusher, wherein when the pusher receives the pressure of the gas generated by the igniter, the pusher moves the separation portion downward. Cutoff device.

12. The protection portion covers a portion below the lid portion of the inner surface of the recess. The cutoff device according to claim 11.

13. The protection portion is a metal layer covering the inner surface of the recess, or an insulating layer different from the material of the pusher covering the inner surface of the recess, and the protection portion is located between the lid portion and the pusher. The cutoff device according to claim 11 or 12.

14. The protection portion is a metal member or an insulating member provided inside the recess, and the metal member or the insulating member is located between the lid portion and the pusher. The cutoff device according to claim 11 or 12.

15. The protection portion covers the entire inner surface of the recess located below the lid portion. The cutoff device according to claim 11 or 12.

16. When the gas is generated, the protection portion is configured to contact the lid portion. The cutoff device according to claim 11 or 12.

17. When the pusher receives the pressure of the gas generated by the igniter, the pusher separates the separation portion from the conductor and moves the separation portion downward. The cutoff device according to any one of claims 1 to 3, 11, and 12.

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