Circuit breaking device

Abstract

A circuit breaking device (1) includes a housing (10) having a metal shell container (120) that defines at least a portion of an accommodation space (13); an igniter (20) provided in the housing (10); a projectile (40) disposed in the accommodation space (13); a conductor sheet (50) that forms a portion of an electric circuit, the conductor sheet (50) having a cut portion (53) cut by the projectile (40), the cut portion (53) being disposed so as to cross the accommodation space (13); a cooling member (60) of electric conductivity that is disposed in the accommodation space (13) for receiving an arc extinction region (R2) of the cut portion (53) cut by the projectile (40); and an insulating cover member (70) disposed between the shell container (120) and the cooling member (60) in the accommodation space (13) to cover an outer side of the arc extinction region (R2).

Description

Technical Field

[0001] This invention relates to a circuit breaking device. Background Technology

[0002] In circuits, circuit-breaking devices are sometimes provided. These devices urgently interrupt conduction in the circuit by operating when the equipment constituting the circuit malfunctions or when the system carrying the circuit malfunctions. One proposed circuit-breaking device uses energy supplied from an igniter or similar source to propel an emitter at high speed, forcibly and physically severing a conductor sheet that forms part of the circuit. In such a circuit-breaking device, when an arc discharge occurs upon the cutting of the conductor edge, the conductor sheet may sometimes evaporate and adhere near the cut portion, reducing the insulation between the cut conductor sheets. Therefore, it is desirable to quickly extinguish the arc discharge.

[0003] Patent Document 1 discloses a circuit breaking device comprising: a housing including a metal top retainer and a bottom container; an igniter disposed in the housing; an emitter disposed in a receiving space within the housing; and a conductor sheet forming part of a circuit. The circuit breaking device is configured such that an arc-extinguishing area within the receiving space for receiving the cut portion of the conductor sheet cut by the emitter has a metal cooling member, thereby rapidly extinguishing the arc by cooling the cut portion.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2022-107404 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] As in Patent Document 1, when the circuit breaking device includes a metal bottom container and a metal cooling element, sometimes the arc discharge when the conductive sheet is cut can reach the metal coolant and the bottom container, and be transmitted through the housing to the circuit of the control system connected to the igniter. Compared with the circuit of the power system connected to the conductive sheet, the circuit of the control system has a smaller rated current, which may cause damage if the current of the power system flows through the housing.

[0009] The technology disclosed herein was made in view of the above-mentioned actual situation, and its purpose is to provide a technology to prevent damage to the circuit on the igniter side caused by the current on the conductive sheet side being transmitted through the housing to the circuit on the igniter side when the circuit breaking device is working.

[0010] Solution for solving the problem

[0011] To solve the above problems, the circuit breaking device disclosed herein includes:

[0012] The shell has an internally formed receiving space extending in one direction, and has a metal outer shell container that divides at least a portion of the receiving space.

[0013] An igniter is located in the housing;

[0014] A transmitter, disposed in the receiving space, is emitted along the receiving space by energy received from the igniter;

[0015] A conductor sheet, disposed in the housing and forming part of a circuit, has a cut-off portion in a portion thereof for removal by the emitter moved by energy received from the igniter, the cut-off portion being configured to traverse the receiving space;

[0016] A conductive cooling element is disposed in the arc-suppression region, which is located in the receiving space on the side opposite to the emitter, separated by the cut-off portion, before the igniter operates, for receiving the cut-off portion cut off by the emitter; and

[0017] An insulating cover component is disposed between the outer shell container and the cooling component within the receiving space, covering the outer side of the arc-extinguishing area.

[0018] In the circuit breaking device, it can also be,

[0019] The housing includes:

[0020] The housing body holds the conductor sheet; and

[0021] The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area.

[0022] The outer casing has an opening for receiving the cut-off portion, and a portion of the opening end of the outer casing is mounted to the housing body via a seal.

[0023] In the circuit breaking device, it can also be,

[0024] The housing includes:

[0025] The housing body holds the conductor sheet; and

[0026] The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area.

[0027] The cover member covers the inside of the outer shell container.

[0028] In the circuit breaking device, the cooling element may also be formed of metal fibers.

[0029] In the circuit breaking device, the cover member may also cover the outside of the cooling element.

[0030] In the circuit breaking device, the cover component may also be formed of polyamide or polycarbonate.

[0031] In the circuit breaking device, it can also be,

[0032] The housing includes:

[0033] The housing body holds the conductor sheet; and

[0034] The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area.

[0035] The housing body and the emitter are formed of an insulating material.

[0036] In the circuit breaking device, it can also be,

[0037] The housing includes:

[0038] A retainer that houses the igniter; and

[0039] Metal fasteners secure the retainer, the housing body, and the emitter.

[0040] In the circuit breaking device, it can also be,

[0041] The igniter is connected to the control circuit that controls the igniter.

[0042] The allowable current or allowable voltage value of the control circuit is less than the allowable current or allowable voltage value of the circuit that is powered through the conductor sheet.

[0043] In the circuit breaking device, it can also be,

[0044] A mounting fitting protrusion is provided on a portion of the arc-extinguishing area side of the housing body.

[0045] A mounting recess is provided on a portion of the open end side of the outer casing container, and this mounting recess is fitted into the mounting protrusion of the casing body.

[0046] The sealing element is disposed between the mounting fitting protrusion and the mounting fitting recess.

[0047] In the circuit breaking device, a groove may also be provided on the outer peripheral surface of the cover member along the extending direction of the receiving space.

[0048] Invention Effects

[0049] According to this disclosure, a technique can be provided to prevent damage to the circuit on the igniter side caused by the current on the conductive sheet side being transmitted through the housing to the circuit on the igniter side when the circuit breaking device is in operation. Attached Figure Description

[0050] Figure 1 This is a diagram illustrating the internal structure of the circuit breaking device (hereinafter referred to as "circuit breaking device") 1 according to the embodiment.

[0051] Figure 2 This is a top view of the inner cover.

[0052] Figure 3A yes Figure 2 A longitudinal section view of the inner cover of the AA line.

[0053] Figure 3B yes Figure 2 A longitudinal sectional view of the inner cover of the BB line.

[0054] Figure 4A This is a diagram showing the area near the mounting part of the inner cover.

[0055] Figure 4B This is an illustrative diagram illustrating the assembly of the main body of the shell and the bottom container.

[0056] Figure 4C The figure shows an example where a chamfered portion is provided at the upper end of the mounting portion of the inner cover.

[0057] Figure 4D This is a diagram showing an example of a groove on the inner circumferential surface of a bottom container.

[0058] Figure 5 This is a top view of the conductor sheet in the embodiment.

[0059] Figure 6 This diagram illustrates the operating status of the circuit breaker device according to the embodiment.

[0060] Figure 7 This is a schematic diagram showing the test apparatus used for circuit breaking tests.

[0061] Figure 8 This is a graph showing the measurement results of the comparative example.

[0062] Figure 9 This is a graph showing the measurement results for sample 1.

[0063] Figure 10This is a graph showing the measurement results for sample 2. Detailed Implementation

[0064] <First Implementation Method>

[0065] Hereinafter, the circuit breaking device according to embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the various configurations and combinations thereof in the embodiments are merely examples, and appropriate additions, omissions, substitutions, and other modifications to the configuration can be made without departing from the spirit of the present disclosure. This disclosure is not limited to the embodiments, but only to the claims.

[0066] <Composition>

[0067] Figure 1 This diagram illustrates the internal structure of the circuit breaking device (hereinafter referred to as "circuit breaking device") 1 according to an embodiment. The circuit breaking device 1 is, for example, a device used to prevent significant losses by cutting off the circuit in the event of a malfunction in a circuit included in an automobile, home appliance, solar power generation system, or a system including a battery (e.g., a lithium-ion battery). In this specification, [the following will be described along the lines of...] Figure 1 The cross section shown in the height direction (the direction in which the accommodating space 13 extends, as described later) is called the longitudinal section of the circuit breaker 1, and the cross section in the direction orthogonal to the height direction is called the transverse section of the circuit breaker 1. Figure 1 The state of the circuit breaker 1 before operation is shown.

[0068] The circuit breaker 1 includes a housing 10 as an outer casing, an igniter 20, an emitter 40, a conductor sheet 50, a cooling element 60, an inner cover 70, etc. The housing 10 has a receiving space 13 extending in one direction from a first end 11 at the upper end to a second end 12 at the lower end. This receiving space 13 is formed in a straight line so that the emitter 40 can move, and extends along the vertical direction of the circuit breaker 1. Figure 1 As shown, the emitter 40 is housed in the receiving space 13 formed inside the housing 10. However, in this specification, the vertical direction of the circuit breaker 1 is merely a direction used to indicate the relative positional relationship of the various elements of the circuit breaker 1 for the convenience of explaining the embodiments.

[0069] [case]

[0070] The housing 10 includes a housing body 100, a top retainer 110, and a bottom container 120. The top retainer 110 and the bottom container 120 are attached to the housing body 100, thereby forming an integral housing 10.

[0071] The housing body 100 has, for example, a generally prismatic shape. However, the shape of the housing body 100 is not particularly limited. Furthermore, a cavity is formed in the housing body 100 in a through-type manner along the vertical direction, forming part of the receiving space 13. The housing body 100 also has an upper surface 101 for fixing the flange 121 and a lower surface 102 for fixing the flange 121 of the bottom container 120. In this embodiment, a cylindrical upper wall 103 is provided upright from the upper surface 101 towards the upper periphery of the upper surface 101 of the housing body 100. In this embodiment, the upper wall 103 is, for example, a square cylindrical shape, but it may also have other shapes. Furthermore, a cylindrical lower wall 104 is provided hanging downward from the lower surface 102 of the housing body 100 on the outer periphery of the lower surface 102. In this embodiment, the lower wall 104 is, for example, a square cylindrical shape, but it may also have other shapes. Furthermore, a cylindrical mounting portion 106 is provided hanging downwards from the lower surface 102 around the cavity portion in the lower surface 102 of the housing body 100. In this embodiment, the mounting portion 106 is cylindrical to match the cavity portion, but it may have other shapes. The housing body 100 constructed as described above may be formed of an insulating member such as a synthetic resin. For example, the housing body 100 may also be formed of nylon, which is a type of polyamide synthetic resin.

[0072] [Top retainer]

[0073] Next, the top retainer 110 will be described. The top retainer 110 is, for example, a cylinder member with a stepped cylindrical shape and a hollow inner side. The top retainer 110 is configured to include a small-diameter cylinder portion 112 located on the upper side (first end 11 side), a large-diameter cylinder portion 113 located on the lower side, a connecting portion 114 connecting them, and a flange portion 111 extending outward from the lower end of the large-diameter cylinder portion 113. For example, the small-diameter cylinder portion 112 and the large-diameter cylinder portion 113 are coaxially arranged, and the diameter of the large-diameter cylinder portion 113 is larger than the diameter of the small-diameter cylinder portion 112.

[0074] Furthermore, the flange portion 111 of the top retainer 110 has a generally quadrilateral shape, retracting into the inner side of the upper cylindrical wall 103 of the housing body 100. The flange portion 111, for example, when positioned inside the upper cylindrical wall 103, can be integrally fastened to the upper surface 101 of the housing body 100 using screws or the like, or fixed using rivets or the like. Alternatively, the top retainer 110 can be attached to the housing body 100 with a sealant applied between the upper surface 101 of the housing body 100 and the lower surface of the flange portion 111 of the top retainer 110. This improves the airtightness of the receiving space 13 formed within the housing 10. Furthermore, the airtightness of the receiving space 13 can be improved by replacing or using an O-ring between the upper surface 101 of the housing body 100 and the flange portion 111 of the top retainer 110, or by using an O-ring in conjunction with a sealant.

[0075] like Figure 1 As shown, the cavity formed inside the small-diameter cylinder portion 112 of the top retainer 110 functions as a receiving space for accommodating part of the igniter 20. Furthermore, the cavity formed inside the large-diameter cylinder portion 113 of the top retainer 110 communicates with the cavity of the housing body 100 located below, forming part of the receiving space 13. The top retainer 110 constructed as described above can be formed, for example, from a suitable metal component with excellent strength and durability, such as stainless steel or aluminum. However, the material forming the top retainer 110 is not particularly limited. Furthermore, regarding the shape of the top retainer 110, the above-described embodiment is only one example; other shapes may also be used.

[0076] [Bottom Container]

[0077] Next, the bottom container 120 will be described. The bottom container 120 in this embodiment is one type of outer shell container. The bottom container 120 has a generally bottomed cylindrical shape with an internal cavity, and is configured to include a side wall portion 122, a bottom wall portion 123 connected to the lower end of the side wall portion 122, and a flange portion 121 connected to the upper end of the side wall portion 122. The side wall portion 122 has, for example, a cylindrical shape, and the flange portion 121 extends outward from the upper end of the side wall portion 122. The flange portion 121 of the bottom container 120 has a generally quadrilateral shape, such that it is housed inside the lower cylindrical wall 104 of the shell body 100. For example, when the flange portion 121 is disposed inside the lower cylindrical wall 104, it can be integrally fastened to the lower surface 102 of the shell body 100 using screws or the like, or it can be fixed by rivets or the like. Here, the bottom container 120 can also be attached to the housing body 100 with a sealant applied between the lower surface 102 of the housing body 100 and the upper surface of the flange 121 of the bottom container 120. This improves the airtightness of the accommodating space 13 formed within the housing 10. Furthermore, the airtightness of the accommodating space 13 can also be improved by replacing or using an O-ring between the lower surface 102 of the housing body 100 and the flange 121 of the bottom container 120, or by using an O-ring in conjunction with a sealant.

[0078] It should be noted that the above-described configuration related to the shape of the bottom container 120 is an example, and other shapes may also be used. Furthermore, the cavity formed inside the bottom container 120 communicates with the upper housing body 100, forming part of the receiving space 13. The bottom container 120 constructed as described above can be formed, for example, from a suitable metal component such as stainless steel or aluminum, which possesses excellent strength and durability. By forming the bottom container 120 from a metal component, rigidity to withstand pressure during operation is ensured, and miniaturization is achieved.

[0079] As described above, the housing 10 of the embodiment is configured to include an integrally assembled housing body 100, a top retainer 110, and a bottom container 120. An accommodating space 13 extending from a first end 11 to a second end 12 is formed on the inner side of the housing 10. The accommodating space 13 accommodates the igniter 20, the emitter 40, the cut-off portion 53 of the conductor sheet 50, the cooling member 60, and the inner cover 70, which will be described in detail below.

[0080] In the integrally assembled housing 10, the flange 111 of the top retainer 110 and the flange 121 of the bottom container 120 clamp the housing body 100 and are fastened by metal bolts 130. It should be noted that the fastening of the housing 10 is not limited to bolts 130; it can also be achieved by other fasteners. In this case, the fasteners can also be made of metal.

[0081] [Inner cover]

[0082] Figure 2 This is a top view of the inner cover 70. Figure 3A yes Figure 2 The longitudinal section view of the inner cover of the AA line 70. Figure 3B yes Figure 2 The image shows a longitudinal sectional view of the inner cover 70 of the BB line. The inner cover 70 has a generally bottomed cylindrical shape with an internal cavity, and is configured to include a side wall portion 71, a bottom wall portion 72 connected to the lower end of the side wall portion 71, etc. In this embodiment, the inner cover 70 is one type of cover member.

[0083] The inner cover 70 is shaped to be housed inside the bottom container 120 and cover the inside of the bottom container 120. Furthermore, the inner cover 70 is also shaped to be disposed outside the cooling member 60 and cover the outside of the cooling member 60. That is, in this embodiment, the inner cover 70 is disposed between the bottom container 120 and the cooling member 60. In this way, by disposing of the cooling member 60 inside the inner cover 70, the arc can be quickly extinguished using the cooling member 60, and melting of the inner cover 70 due to the heat of the arc can be suppressed. Consider the following possibility: if the cooling member 60 is not disposed, the arc is not cooled by the cooling member 60, the arc cannot be quickly extinguished, and the inner cover 70 melts due to the heat of the arc, and current generated by the arc discharge is passed through the melted portion. In contrast, in the circuit breaker 1 of this embodiment, by disposing of the inner cover 70 outside the cooling member 60, the arc is quickly extinguished using the cooling member 60, and melting of the inner cover 70 is suppressed.

[0084] In this embodiment, the thickness (wall thickness) of the inner cover 70 from the outer surface on the bottom container 120 side to the inner surface on the cooling member 60 side is 1.0 mm. The wall thickness of the inner cover 70 is not limited to this; it is acceptable as long as it has sufficient pressure resistance to prevent arc discharge from reaching the bottom container 120, for example, 0.5 mm or more. The inner cover 70 is formed of an insulating material such as synthetic resin. For example, the inner cover 70 may also be formed of silicone resin, polyamide, or polycarbonate.

[0085] The inner cover 70 has an opening 73 at its upper end, and the cavity formed inside it communicates with the cavity of the upper housing body 100. Figure 4AThe figure shows the area near the mounting portion 74 of the inner cover 70. A portion of the inner diameter of the opening end side of the side wall portion 71 of the inner cover 70 is wider than the bottom wall portion 72 side, and this expanded diameter portion becomes the mounting portion (mounting fitting recess) 74 of the housing body 100. In other words, the mounting portion 74 has a mounting portion peripheral surface 702 located outside the inner peripheral surface 701 of the mounting portion 74 (the side away from the conductor sheet 50 in the extending direction of the receiving space 13). Furthermore, the mounting portion 74 has an abutment surface 703 that connects the inner peripheral surface 701 and the mounting portion peripheral surface 702, with the flat surface facing upwards. That is, the upper inner side of the inner cover 70 is formed by the mounting portion peripheral surface 702 and the abutment surface 703 in a cut-off manner. It should be noted that in this embodiment, the abutment surface 703 is a surface that is substantially orthogonal to the extending direction (hereinafter also referred to as the axial direction) of the receiving space 13, but it is not limited to this. For example, the contact surface 703 can also be a tapered surface that is inclined such that the outer side of the inner cover 70 is higher than the inner side of the inner cover 70 (closer to the conductor sheet 50).

[0086] The inner cover 70 is fitted with the mounting portion 74 and the mounting portion (mounting fitting protrusion) 106 of the housing body 100 (in Figure 4A In the example, the mounting part 74 is installed by being externally embedded in the mounting part 106. For example... Figure 4A As shown, a sealing element 75 is provided between the mounting portion 74 of the inner cover 70 and the mounting portion 106 of the housing body 100. It should be noted that even if no gap is designed between these mounting portions 74 and 106, a gap will still be created between the inner cover 70 and the housing body 100 due to the pressure of the combustion gases during operation of the circuit breaker 1, causing the combustion gases to flow between the mounting portions 74 and 106. Therefore, in this embodiment, a sealing element 75 is provided between the mounting portion 74 of the inner cover 70 and the mounting portion 106 of the housing body 100 to prevent gaps from forming between these mounting portions 74 and 106. The sealing element 75 is formed of an insulating material, such as a synthetic resin like silicone resin. It should be noted that the sealing element 75 can also be an adhesive.

[0087] In this way, the inner cover 70 of this embodiment is configured to have an opening 73 at the upper end, into which the lower end of the mounting portion 106 is inserted. Therefore, during assembly, the mounting portion of the housing body 100 is positioned by the peripheral surface 702 of the mounting portion of the inner cover 70, which facilitates the alignment of the bottom container 120 with respect to the housing body 100. Figure 4B This is an explanatory diagram of assembling the main body 100 and the bottom container 120.

[0088] First, the inner cover 70 is pressed into the bottom container 120. Then, the cooling element 60 is inserted into the inner cover, bringing the housing body 100 close to the bottom container 120 from above, as in state I. At this time, if the mounting portion 106 of the housing body 100 and the mounting portion 74 of the inner cover 70 are not aligned as in state II, the housing body 100 and the bottom container 120 will not properly engage. For example, if the housing body 100 and the bottom container 120 are threaded together while the mounting portion 106 of the housing body 100 is in contact with the upper surface of the inner cover 70, as in state II, the inner cover 70 will be flattened, resulting in damage such as gaps or cracks in the inner cover 70. Current will then flow through the metal bottom container from the gaps or cracks, reducing insulation. Furthermore, fragments of the damaged inner cover 70 may become trapped between the inner cover 70 and the housing body 100, creating a gap between them.

[0089] On the other hand, if the housing body 100 and the bottom container 120 are aligned as in state III, assembly is performed with the outer peripheral surface of the mounting portion 106 of the housing body 100 in contact with the peripheral surface 702 of the mounting portion of the inner cover 70. In this case, the mounting portion 106 of the housing body 100 is inserted along the peripheral surface 702 of the mounting portion of the inner cover 70, thus facilitating assembly without damaging the inner cover 70 or reducing insulation. Furthermore, Figure 4C This diagram shows an example where a tapered portion 704 is provided at the upper end of the mounting portion peripheral surface 702 of the inner cover 70. (See diagram for example.) Figure 4C As shown, the inner cover 70 can also be formed with a tapered shape at the upper end of the mounting portion circumferential surface 702, with the inner diameter expanding upwards, meaning the height of the upper inner edge of the inner cover 70 gradually decreases inwards (towards the center). Therefore, when assembling the housing body 100 and the bottom container 120, even if the mounting portion 106 of the housing body 100 is slightly off-center, the mounting portion 106 is accurately positioned along the tapered portion 704, thus making alignment of the housing body 100 and the bottom container 120 easier. In this way, the inner cover 70 of this embodiment allows the housing body 100 to accurately engage with the bottom container 120 and suppresses gaps caused by defects or cracks in the inner cover 70.

[0090] Furthermore, a groove 710 is provided on the outer peripheral surface of the inner cover 70 along a generally axial direction. For example... Figure 2As shown, regarding the grooves 710, when the inner cover 70 is viewed axially from above, four rotationally symmetrical locations are provided on the outer peripheral surface. The number of grooves 710 is not particularly limited. It should be noted that when multiple grooves 710 are provided, they can also be arranged evenly along the circumference of the inner cover 70 at equal intervals. In this way, by forming grooves 710 on the outer peripheral surface of the inner cover 70, air within the bottom container 120 is discharged through the grooves 710 when the inner cover 70 is pressed into the bottom container 120. For example, if the inner cover 70 without grooves 710 is pressed into the bottom container 120, air accumulates between the bottom of the inner cover 70 and the bottom of the bottom container 120, sometimes making it difficult to press it into contact with these bottoms. Therefore, the circuit breaker 1 of this embodiment provides grooves 710 on the outer peripheral surface of the inner cover 70, making assembly easier. Furthermore, it is not limited to this; grooves can also be provided on the inner peripheral surface of the bottom container 120. Figure 4D This diagram shows an example where a groove 129 is provided on the inner circumferential surface 128 of the bottom container 120. Figure 4D In the example, an axial groove 129 is formed on the inner circumferential surface (inner circumferential surface 128) of the side wall portion 122 of the bottom container 120. The groove 129 extends to the upper opening of the bottom container 120 and becomes an escape channel (flow path) for air inside the bottom container 120 when the inner cover 70 is pressed into the bottom container 120. This groove, which serves as an air escape channel, may be provided only in the bottom container 120, only in the inner cover 70, or both. It should be noted that when grooves 710 and 129 are provided in both the bottom container 120 and the inner cover 70, the grooves 710 and 129 may also be provided in opposite positions in a mutually connected manner.

[0091] [Igniter]

[0092] Next, the igniter 20 will be described. The igniter 20 is an electric igniter comprising an ignition part 21 including an initiating explosive and an igniter body 22 having a pair of conductive pins (not shown) connected to the ignition part 21. The igniter body 22 is, for example, surrounded by insulating resin. Furthermore, the top ends of the pair of conductive pins of the igniter body 22 are exposed to the outside and are electrically connected to the control circuit 80 via a cable 81, supplying operating current when the circuit breaker 1 is used.

[0093] The igniter body 22 includes: a generally cylindrical body portion 221, housed within the small-diameter cylinder portion 112 of the top retainer 110; and a connector portion 222 located on the upper part of the body portion 221. The igniter body 22 is fixed to the small-diameter cylinder portion 112, for example, by pressing the body portion 221 into the inner circumferential surface of the small-diameter cylinder portion 112. Furthermore, a reduced-diameter portion is formed annularly along the circumferential direction at the axial midpoint of the body portion 221, with its outer circumferential surface recessed compared to other locations, and an O-ring 223 is embedded in this reduced-diameter portion. The O-ring 223 is formed, for example, of rubber (e.g., silicone rubber) or synthetic resin, and functions to improve the airtightness between the inner circumferential surface of the small-diameter cylinder portion 112 and the body portion 221.

[0094] The connector portion 222 of the igniter 20 is disposed protruding outward through the opening 112A formed at the upper end of the small-diameter cylinder portion 112. The connector portion 222 has, for example, a cylindrical shape covering the side of the conductive pin, and is configured to connect to a connector on the power supply side.

[0095] like Figure 1 As shown, the ignition part 21 of the igniter 20 is configured to face the receiving space 13 of the housing 10 (more specifically, the cavity formed inside the large-diameter cylinder part 113). The ignition part 21 is configured, for example, to house an initiating explosive within the igniter cup. For example, the initiating explosive is housed within the igniter cup of the ignition part 21 in contact with a bridge wire (resistor) that is connected so that the base ends of a pair of conductive pins are linked together. As the initiating explosive, ZPP (zirconium-potassium perchlorate), ZWPP (zirconium-tungsten-potassium perchlorate), THPP (titanium hydride-potassium perchlorate), lead trinitroresorcinol, etc., may also be used.

[0096] When the igniter 20 is activated, when the working current for igniting the detonator is supplied from the power source to the conductive pin, the bridge wire of the ignition section 21 heats up. As a result, the detonator in the igniter cup ignites and burns, generating combustion gases. Then, as the detonator in the igniter cup of the igniter section 21 burns, the pressure inside the igniter cup rises, the crack surface 21A of the igniter cup cracks, and the combustion gases are discharged from the igniter cup into the receiving space 13. More specifically, the combustion gases from the igniter cup are discharged into the recess 411 of the piston section 41 of the launcher 40, which will be described later, located within the receiving space 13.

[0097] [Emitter]

[0098] Next, the launcher 40 will be described. The launcher 40 is formed of an insulating material, such as synthetic resin, and includes a piston portion 41 and a rod portion 42 connected to the piston portion 41. The piston portion 41 has a generally cylindrical shape and an outer diameter that approximately corresponds to the inner diameter of the large-diameter cylinder portion 113 of the top retainer 110. For example, the diameter of the piston portion 41 may also be slightly smaller than the inner diameter of the large-diameter cylinder portion 113. The shape of the launcher 40 can be appropriately modified depending on the shape of the housing 10, etc.

[0099] Furthermore, a cylindrical recess 411 is formed on the upper surface of the piston portion 41, in which the ignition portion 21 is housed. The bottom surface of the recess 411 is formed as a pressure-bearing surface 411A that receives energy from the igniter 20 when the igniter 20 is in operation. Additionally, a reduced-diameter portion with a recessed outer circumference is formed annularly along the circumference of the piston portion 41 at its axial midpoint, and an O-ring 43 is embedded in this reduced-diameter portion. The O-ring 43 is formed, for example, of rubber (e.g., silicone rubber) or synthetic resin, and functions to improve the airtightness between the inner circumferential surface of the large-diameter cylinder portion 113 and the piston portion 41.

[0100] The rod portion 42 of the emitter 40 is, for example, a rod-shaped member having an outer peripheral surface with a smaller diameter than the piston portion 41, and is integrally connected to the lower end side of the piston portion 41. The lower end surface of the rod portion 42 is formed as a cutting surface 421 for cutting off the cut-off portion 53 from the conductor sheet 50 when the circuit breaker 1 is in operation. It should be noted that the rod portion 42 in this embodiment has a generally cylindrical shape, but its shape is not particularly limited and can be varied according to the shape and size of the cut-off portion 53 that should be cut off from the conductor sheet 50 when the circuit breaker 1 is in operation. The rod portion 42 may also have a cylindrical, prism, or other cylindrical shape, for example. It should be noted that in Figure 1 At the initial position of the launcher 40 shown, the region of the top end of the rod portion 42 of the launcher 40, including the cut surface 421, is positioned in the cavity portion of the housing body 100 (forming part of the receiving space 13). The diameter of the rod portion 42 is, for example, slightly smaller than the inner diameter of the inner circumferential surface of the housing body 100, configured such that when the launcher 40 is launched, the outer circumferential surface of the rod portion 42 is guided along the inner circumferential surface.

[0101] Details of the launcher 40 constructed as described above will be described later, including the upper surface of the piston portion 41 of the pressure-bearing surface 411A, which bears the energy from the igniter 20 when the igniter 20 is operating, thereby launching the launcher 40 from... Figure 1 The initial position shown is launched and moves at high speed along the receiving space 13 toward the side (below) of the second end 12. Specifically, as Figure 1As shown, the piston portion 41 of the launcher 40 is housed inside the large-diameter cylinder portion 113 of the top retainer 110, and can slide axially along the inner wall surface of the large-diameter cylinder portion 113. In this embodiment, the piston portion 41 of the launcher 40 is provided as a generally cylindrical shape, but its shape is not particularly limited. The external shape of the piston portion 41 can be appropriately shaped and sized according to the shape and size of the inner wall surface of the large-diameter cylinder portion 113.

[0102] [Conductor sheet]

[0103] Next, the conductor sheet 50 will be described. Figure 5 This is a top view of the conductor strip 50 according to the embodiment. The conductor strip 50 is a conductive metal body that constitutes part of the circuit breaker 1 and forms part of the circuit when the circuit breaker 1 is installed in a specified circuit; it is sometimes referred to as a bus bar. The conductor strip 50 can be formed of a metal such as copper (Cu). However, the conductor strip 50 can also be formed of a metal other than copper, or it can be formed of an alloy of copper and other metals. It should be noted that examples of metals other than copper contained in the conductor strip 50 include manganese (Mn), nickel (Ni), and platinum (Pt).

[0104] exist Figure 5 In one embodiment, the conductor sheet 50 is integrally formed as an elongated flat plate, including first connecting ends 51 and second connecting ends 52 at both ends, and a cut-out portion 53 located in the middle. Connecting holes 51A and 52A are respectively provided at the first connecting ends 51 and 52 of the conductor sheet 50. These connecting holes 51A and 52A are used for connection with other conductors (e.g., leads) in a circuit. It should be noted that... Figure 1 The connection holes 51A and 52A of the conductor sheet 50 are omitted in the illustration. Furthermore, the cut-out portion 53 of the conductor sheet 50 is configured to traverse the receiving space 13 and is forcibly and physically cut off by the rod portion 42 of the emitter 40 in the event of an abnormality such as excessive current in the circuit using the circuit breaker 1. Cutouts (slits) 54 are formed at both ends of the cut-out portion 53 of the conductor sheet 50 to facilitate cutting and removal of the cut-out portion 53.

[0105] Here, the conductor sheet 50 can take various forms, and its shape is not particularly limited. Figure 5In the example shown, the surfaces of the first connecting end 51, the second connecting end 52, and the cut-out portion 53 are formed on the same surface, but this is not a limitation. For example, in the conductor sheet 50, the cut-out portion 53 may also be connected to the first connecting end 51 and the second connecting end 52 in an orthogonal or inclined manner relative to the first connecting end 51 and the second connecting end 52. Furthermore, there is no particular limitation on the planar shape of the cut-out portion 53 of the conductor sheet 50. Of course, there is no particular limitation on the shape of the first connecting end 51 and the second connecting end 52 of the conductor sheet 50. Furthermore, the cut 54 of the conductor sheet 50 may be appropriately omitted. In this embodiment, the cut-out portion 53 is cut off from the first connecting end 51 and the second connecting end 52 at two locations where the cut 54 is formed, but the cut-out portion (also called the cut-off portion) 53 is not limited to this, and may also be configured to be cut off near the center by the rod portion 42, so as to be bent toward the bottom container 120 side by pulling the cut-off end away.

[0106] Here, a pair of conductor sheet holding holes 105A and 105B are formed in the housing body 100 of the embodiment. The pair of conductor sheet holding holes 105A and 105B extend in a cross-sectional direction orthogonal to the vertical (axial) direction of the housing body 100. More specifically, the pair of conductor sheet holding holes 105A and 105B extend in a straight line across the cavity (accommodation space 13) of the housing body 100. The conductor sheet 50 configured as described above is held in the housing body 100 in a state where it is inserted through the pair of conductor sheet holding holes 105A and 105B formed in the housing body 100. Figure 1 In the example shown, the first connecting end 51 of the conductor piece 50 is held in the state of being inserted into the conductor piece holding hole 105A, and the second connecting end 52 is held in the state of being inserted into the conductor piece holding hole 105B. Furthermore, in this state, the cut-out portion 53 of the conductor piece 50 is positioned in the cavity portion (accommodating space 13) of the housing body 100. As described above, the conductor piece 50, mounted to the housing body 100, is held in an orientation orthogonal to the extending direction (axial direction) of the accommodating space 13, with the cut-out portion 53 traversing the accommodating space 13. It should be noted that... Figure 5 The reference numeral L1 in the attached drawings indicates the outer periphery of the upper portion 42 of the conductor piece 50 when it is attached to the housing body 100 of the circuit breaker 1. In this embodiment, the outer periphery L1 of the conductor piece 50 is positioned to approximately coincide with the positions of the cutouts 54 at both ends of the cut-out portion 53. In this embodiment, for example, the cross-sectional area of ​​the accommodating space 13 is larger than the cross-sectional area of ​​the cut-out portion 53, thus a gap is formed on the side of the cut-out portion 53.

[0107] [Cooling components]

[0108] Next, the cooling element 60 disposed in the receiving space 13 of the housing 10 will be described. Here, as Figure 1 As shown, before the circuit breaker 1 (igniter 20) operates, the cut-off portion 53 of the conductor sheet 50, held by a pair of conductor sheet holding holes 105A and 105B of the housing body 100, is horizontally positioned across the receiving space 13 of the housing 10. Hereinafter, in the receiving space 13 of the housing 10, the area (space) where the emitter 40 is arranged across the cut-off portion 53 of the conductor sheet 50 is referred to as the "emitter initial placement area R1," and the area (space) located on the side opposite to the emitter 40 is referred to as the "arc suppression area R2." It should be noted that, as described above, a gap is formed on the side of the cut-off portion 53 arranged to cross the receiving space 13; therefore, the emitter initial placement area R1 and the arc suppression area R2 are not completely isolated by the cut-off portion 53 and are connected. Of course, the emitter initial placement area R1 and the arc suppression area R2 can also be completely isolated by the cut-off portion 53 depending on its shape and size.

[0109] The arc-extinguishing region R2 of the accommodating space 13 is a region (space) for receiving the cut-off portion 53 removed by the rod portion 42 of the launcher 40 emitted when the circuit breaker 1 (igniter 20) is activated. A cooling member 60, serving as an arc-extinguishing component, is disposed in this arc-extinguishing region R2. The cooling member 60 is used to absorb the electric arc generated when the launcher 40 cuts off the cut-off portion 53 of the conductor sheet 50 and the heat energy of the cut-off portion 53 for cooling, thereby suppressing the generation of an electric arc when the current is interrupted or extinguishing (disappearing) the generated electric arc.

[0110] The arc-extinguishing region R2 of the circuit breaker 1 is a space for accommodating the cut-off portion 53 that is removed from the first connecting end 51 and the second connecting end 52 of the conductor sheet 50 by the emitter 40, and also serves as a space for effectively extinguishing the arc generated when the emitter 40 cuts off the cut-off portion 53. Furthermore, in order to effectively extinguish the arc generated when the cut-off portion 53 is removed from the conductor sheet 50, a cooling element 60 is provided in the arc-extinguishing region R2 as an arc-extinguishing element.

[0111] As one embodiment, the cooling element 60 is solid. Furthermore, as another embodiment, the cooling element 60 is formed of a conformal material. A conformal material, as used here, refers to a material that maintains a fixed shape when no external force is applied, and retains its integrity (does not fall apart) even if deformation may occur when an external force is applied. For example, an object formed from fibrous material into a desired shape can be cited as a conformal material. In this embodiment, the cooling element 60 is formed from metal fibers that serve as the conformal material. Examples of metal fibers forming the cooling element 60 include at least one of steel wool and copper wool. However, the above-described embodiment of the cooling element 60 is an example and is not limited to these embodiments. For example, the cooling element 60 may also be formed from conductive materials other than metal fibers, such as carbon fibers or resin materials mixed with conductive fillers.

[0112] The cooling component 60 is, for example, formed in a generally disc shape and disposed at the bottom of the bottom container 120.

[0113] <Action>

[0114] Next, the operation of activating circuit breaker 1 to disconnect the circuit will be explained. As described above, Figure 1 The state of the circuit breaker 1 before operation is shown (hereinafter also referred to as the "initial state before operation"). In this initial state before operation, the emitter 40 of the circuit breaker 1 is set in the following initial position: the piston portion 41 is positioned on the first end 11 side (upper end side) of the receiving space 13, and the cut surface 421 formed at the lower end of the rod portion 42 is positioned on the upper surface of the cut portion 53 of the conductor sheet 50.

[0115] Furthermore, the circuit breaker 1 of the embodiment includes: an abnormality sensing sensor (not shown) that senses abnormal states of devices (vehicles, generators, energy storage devices, etc.) connected to the circuit to be cut off; and a control circuit 80 that controls the operation of the igniter 20. The abnormality sensing sensor can sense abnormal states based on the current flowing through the conductor sheet 50, as well as based on voltage and the temperature of the conductor sheet 50. Alternatively, the abnormality sensing sensor may be, for example, an impact sensor, a temperature sensor, an acceleration sensor, or a vibration sensor, sensing abnormal states such as accidents and fires based on the impact, temperature, acceleration, and vibration of the vehicle or other device. The control circuit 80 of the circuit breaker 1 is, for example, a computer capable of performing a predetermined function by executing a predetermined control program. The predetermined function implemented by the control circuit 80 can also be implemented by corresponding hardware. Furthermore, the abnormal state is detected by the abnormality sensing sensor in cases such as excessive current flowing through the conductor sheet 50, which forms part of the circuit of the circuit breaker 1, or excessive impact due to a vehicle collision. Abnormal information related to the detected abnormal state is transferred from the abnormality sensing sensor to the control circuit 80. For example, when an abnormal state is determined to have occurred based on abnormal information from the abnormality sensing sensor, the control circuit 80 supplies operating current to the conductive pin of the igniter 20, causing the igniter 20 to operate. It should be noted that the aforementioned abnormality sensing sensor and control circuit 80 may not be included in the components of the circuit breaker 1, for example, they may be included in a different device than the circuit breaker 1. Furthermore, the aforementioned abnormality sensing sensor and control circuit 80 are not essential components in the circuit breaker 1.

[0116] For example, when an abnormal current is detected in the circuit by an abnormal current sensing sensor, the control circuit 80 of the circuit breaker 1 activates the igniter 20. That is, operating current is supplied from an external power source (not shown) to the conductive pin of the igniter 20, resulting in the ignition of the initiating explosive in the ignition section 21, generating combustion gases. Then, due to the pressure rise in the ignition section 21, the cracking surface 21A cracks, and the combustion gases of the initiating explosive are discharged from the ignition section 21 into the receiving space 13.

[0117] Here, the ignition part 21 of the igniter 20 is housed in the recess 411 of the piston part 41, and the cracked surface 21A of the ignition part 21 is arranged opposite to the pressure-receiving surface 411A of the recess 411 of the launcher 40. Therefore, the combustion gas from the ignition part 21 is discharged into the recess 411, and the pressure (combustion energy) of the combustion gas is transmitted to the upper surface of the piston part 41, including the pressure-receiving surface 411A. As a result, the launcher 40 moves downward in the receiving space 13 along the extending direction (axial direction) of the receiving space 13.

[0118] Figure 6This diagram illustrates the operation of the circuit breaker device 1 according to the embodiment. Figure 6 The upper section shows the status of the circuit breaker 1 during operation. Figure 6 The lower section shows the state after the circuit breaker 1 has been completed. As described above, by the operation of the igniter 20, the launcher 40, which receives the pressure (combustion energy) of the combustion gas of the detonator, is forcefully pressed downward. As a result, the cut surface 421 formed on the lower end side of the rod 42 cuts off the boundary portions between the first connecting end 51 and the second connecting end 52 of the conductor sheet 50 and the cut-off portion 53 by shearing. As a result, the cut-off portion 53 is cut off from the conductor sheet 50. It should be noted that as long as the launcher 40 can move smoothly along the extension direction (axial direction) of the receiving space 13 when the igniter 20 is working, the shape and size of the launcher 40 can be freely determined. For example, the outer diameter of the piston portion 41 of the launcher 40 can also be set to be equal to the inner diameter of the large-diameter cylinder portion 113 of the top retainer 110.

[0119] And, as Figure 6 As shown in the lower section, the emitter 40 moves downward along the extending direction (axial direction) of the receiving space 13 by a predetermined stroke until the lower end face of the piston portion 41 abuts (collides) with the upper surface 101 of the housing body 100. Furthermore, in this state, the cut-off portion 53, which is removed from the conductor sheet 50 by the rod portion 42 of the emitter 40, is housed within the arc-extinguishing region R2 where the cooling element 60 is located. As a result, the first connecting end 51 and the second connecting end 52 located at both ends of the conductor sheet 50 become de-energized, and the predetermined circuit of the circuit breaker 1 is forcibly interrupted.

[0120] The circuit breaker 1 of the embodiment is provided with a cooling member 60 in the arc-extinguishing region R2. Therefore, the cut-off portion 53 housed in the arc-extinguishing region R2 can be cooled quickly by the cooling member 60. As a result, when the cut-off portion 53 is cut from the conductor sheet 50 that constitutes part of the defined circuit by the emitter 40, even if an arc is generated at the cut surface of the cut-off portion 53 of the conductor sheet 50, the generated arc can be extinguished quickly and effectively.

[0121] Furthermore, in this embodiment, the circuit breaker 1 has an insulating inner cover 70 disposed between the bottom container 120 and the cooling component 60, covering the outer side of the arc-extinguishing area R2. Thus, the circuit breaker 1 in this embodiment can use the insulating inner cover 70 to prevent arc discharge during operation from reaching the bottom container 120, prevent overcurrent from flowing through the housing 10 to the control circuit 80 connected to the igniter 20, and prevent damage to the control circuit 80.

[0122] In particular, the main body 100, the emitter 40, and the inner cover 70 of the circuit breaker 1 in this embodiment are all insulating. When in operation, the arc-extinguishing area R2 is surrounded by insulating components, thus effectively preventing the leakage of current generated by arc discharge.

[0123] Furthermore, in this embodiment, the circuit breaker 1 has a sealing element 75 between the mounting portion 74 of the inner cover 70 and the mounting portion 106 of the housing body 100, so that no gap is generated between these mounting portions 74 and 106. Therefore, even if pressure is applied between the mounting portions 74 and 106 due to combustion gases during operation, the circuit breaker 1 in this embodiment will not allow combustion gases to enter between the mounting portions 74 and 106, thus preventing overcurrent from flowing into the control circuit 80.

[0124] In particular, in this embodiment, the circuit breaker 1 has a mounting portion 74 formed by the mounting portion peripheral surface 702 and the abutment surface 703, with the upper end of the inner peripheral surface of the inner cover 70 being cut off. Assuming that the mounting portion 106 of the housing body 100 is inserted into the inner cover 70 without the mounting portion 74, the housing body 100 and the inner cover 70 only contact the outer peripheral surface of the mounting portion 106 and the inner peripheral surface of the inner cover 70.

[0125] In contrast, in the circuit breaker 1 of this embodiment, the lower end of the mounting portion 106 of the housing body 100 abuts against the contact surface 703 of the mounting portion 74, and the outer peripheral surface of the mounting portion 106 is in contact with the peripheral surface 702 of the mounting portion of the inner cover 70. Therefore, the contact area between the housing body 100 and the inner cover 70 increases, and the airtightness is improved. Moreover, when the mounting portion 106 of the housing body 100 abuts against the contact surface 703 of the mounting portion 74, and the flange portion 121 of the bottom container 120 is fastened to the housing body 100 by screws or the like, the mounting portion 106 of the housing body 100 and the mounting portion 74 of the inner cover 70 compress each other and expand radially, thereby improving the airtightness. Based on these configurations, the circuit breaker 1 of this embodiment can improve the airtightness between the housing body 100 and the inner cover 70, suppress the leakage of combustion gases, and prevent overcurrent from flowing through the control circuit 80.

[0126] It should be noted that in this embodiment, the inner cover 70 (cover member) is formed separately from the bottom container 120, but the inner cover 70 may also be integrally formed with the bottom container 120. For example, the cover member may be an insulating layer formed on the inner surface of the bottom container 120. In addition, the cover member may also be integrally formed with the cooling member 60. For example, the cover member may be an insulating layer formed in a manner that covers the outer peripheral surface and bottom surface of the cooling member 60.

[0127] <Circuit Disconnection Test>

[0128] Next, the circuit breaking test performed on the circuit breaking device 1 will be described. Figure 7This is a schematic diagram showing a test apparatus for circuit breaking tests. Reference numeral 1000 indicates a power supply, reference numeral 2000 indicates an insulation resistance meter, and reference numeral 3000 indicates a control device for the test. Furthermore, reference numeral 4000 indicates wiring for forming circuit EC in cooperation with the conductor sheet 50 in the circuit breaking device 1. Additionally, reference numeral 5000 indicates wiring for allowing the operating current supplied from the control device 3000 to flow to the conductive pin in the igniter 20 of the circuit breaking device 1.

[0129] Next, the steps for the circuit break test will be explained.

[0130] (Step 1) As Figure 7 As shown, the first connecting end 51 and the second connecting end 52 of the conductor piece 50 in the circuit breaker 1 are respectively connected to the power supply 1000 via wiring 4000, and the igniter 20 in the circuit breaker 1 is connected to the control device 3000 via wiring 5000.

[0131] (Step 2) Allow the current from power supply 1000 to flow through circuit EC.

[0132] (Step 3) A working current is supplied from the control device 3000 to the igniter 20 of the circuit breaker 1, thereby activating the igniter 20.

[0133] (Step 4) Disconnect the power supply 1000.

[0134] In this circuit breaking test, the circuit breaking device 1 configured as described above is used as sample 1, the circuit breaking device 1 with the seal 75 removed is used as sample 2, and the circuit breaking device 1 with the seal 75 and inner cover 70 removed is used as a comparative example. The test was conducted according to the above steps, and the voltage applied between the second connection end 52 and the control circuit 80 was measured when the emitter 40 cut off the cut-off portion 53 from the conductor sheet 50.

[0135] Figure 8 This is a graph showing the measurement results of the comparative example. Figure 9 This is a graph showing the measurement results for sample 1. Figure 10 This is a graph showing the measurement results for sample 2. Figures 8-9 In the diagram, the horizontal axis represents time, and the vertical axis represents voltage.

[0136] like Figure 8As shown, in the comparative example, a high voltage was applied to the control circuit 80 after operation. This is believed to be because the current flowing into the cooling element 60 due to the arc discharge during operation is transmitted via the following path: cooling element 60 → bottom container 120 → bolt 130 → top retainer 110 → igniter 20 → cable 81 → control circuit 80. It should be noted that the control circuit 80 is the circuit for the control system of the igniter 20, etc., and is designed with lower permissible current and voltage values ​​compared to the circuit of the power supply system that supplies power via the conductor sheet 50. That is, the permissible current or voltage value of the control circuit 80 is lower than the current and voltage values ​​supplied via the conductor sheet 50. Therefore, if the current flowing into the conductor sheet 50 is transmitted to the control circuit 80 as described above, the control circuit 80 may be damaged. In contrast, in Figure 9 In sample 1, since the inner cover 70 and the seal 75 block the current generated by the arc discharge, the voltage of the control circuit 80 does not rise after operation, thus confirming the effect of preventing damage to the control circuit 80.

[0137] exist Figure 10 In sample 2, although the voltage applied to the control circuit 80 increases after operation, it is still different from... Figure 8 In contrast, the voltage drops rapidly, resulting in less power being transferred to the control circuit 80, thus confirming the effectiveness of preventing damage to the control circuit 80. Furthermore, according to... Figure 9 and Figure 10 The comparison confirms that by providing a seal 75 between the mounting parts 74 and 106, damage to the control circuit 80 can be effectively prevented.

[0138] The embodiments of the circuit breaking device disclosed herein have been described above, but the various solutions disclosed in this specification can also be combined with any other features disclosed in this specification.

[0139] Explanation of reference numerals in the attached figures

[0140] 1: Circuit breaker;

[0141] 10: Shell;

[0142] 13: Accommodation space;

[0143] 20: Ignition device;

[0144] 40: Launcher;

[0145] 50: Conductor sheet;

[0146] 53: The excised portion;

[0147] 60: Cooling components;

[0148] 70: Inner cover.

Claims

1. A circuit breaking device, the circuit breaking device comprising: The shell has an internally formed receiving space extending in one direction, and has a metal outer shell container that divides at least a portion of the receiving space. An igniter is located in the housing; A transmitter, disposed in the receiving space, is emitted along the receiving space by energy received from the igniter; A conductor sheet, disposed in the housing and forming part of a circuit, has a cut-off portion in a portion thereof for removal by the emitter moved by energy received from the igniter, the cut-off portion being configured to traverse the receiving space; A conductive cooling element is disposed in an arc-suppressing region, which is located in the receiving space on the side opposite to the emitter, separated by the cut-off portion, before the igniter operates, for receiving at least a portion of the cut-off portion that has been cut off by the emitter; and An insulating cover component is disposed between the outer casing and the cooling component within the receiving space, covering the arc-suppressing area side of the outer casing.

2. The circuit breaking device according to claim 1, wherein, The housing includes: The housing body holds the conductor sheet; and The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area. The outer casing has an opening for receiving the cut-off portion, and a portion of the opening end of the outer casing is mounted to the housing body via a seal.

3. The circuit breaking device according to claim 1, wherein, The housing includes: The housing body holds the conductor sheet; and The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area. The cover member covers the inside of the outer shell container.

4. The circuit breaking device according to claim 1, wherein, The cooling element is formed of metal fibers.

5. The circuit breaking device according to any one of claims 1 to 4, wherein, The cover component covers the outside of the cooling component.

6. The circuit breaking device according to any one of claims 1 to 4, wherein, The cover component is formed of polyamide or polycarbonate.

7. The circuit breaking device according to claim 1, wherein, The housing includes: The housing body holds the conductor sheet; and The outer casing is positioned relative to the main body of the casing on the opposite side of the emitter before operation, covering the outer side of the arc-suppression area. The housing body and the emitter are formed of an insulating material.

8. The circuit breaking device according to claim 7, wherein, The housing includes: A retainer that houses the igniter; and Metal fasteners secure the retainer, the housing body, and the emitter.

9. The circuit breaking device according to any one of claims 1 to 4, wherein, The igniter is connected to the control circuit that controls the igniter. The allowable current or allowable voltage value of the control circuit is less than the allowable current or allowable voltage value of the circuit that is powered through the conductor sheet.

10. The circuit breaking device according to claim 2, wherein, A mounting fitting protrusion is provided on a portion of the arc-extinguishing area side of the housing body. A mounting recess is provided on a portion of the open end side of the outer casing container, and the mounting recess is fitted into the mounting protrusion of the casing body. The sealing element is disposed between the mounting fitting protrusion and the mounting fitting recess.

11. The circuit breaking device according to any one of claims 1 to 10, wherein, The outer peripheral surface of the cover member is provided with a groove along the extending direction of the receiving space.

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