JP2019212500A - Current shielding device - Google Patents

Abstract

To provide a current shielding device capable of improving the reliability of current shielding as compared with a prior art.SOLUTION: A current shielding device 100 includes a cutting blade 24 that cuts a current supply path 30 that electrically connects an electrical device and an electrical circuit, an accommodation portion that accommodates an insulating material, an igniter 10 that moves the cutting blade 24 toward the current supply path 30, at least one different igniter that supplies an insulating material to the current supply path 30, and a control unit 25 that drives the igniter 10 and the other igniter when a collision is detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a current shielding device for shielding current supply to an electric circuit provided in a vehicle such as an automobile.

  In recent years, an electric vehicle which is an example of a vehicle is equipped with a storage battery such as a high-voltage lithium ion battery, and there is a current situation in which a large current flows in an electric circuit provided in the electric vehicle. In the future, the increase in current of electric vehicles is expected to accelerate further.

  In the unlikely event that an accident occurs in such an electric vehicle, it has been proposed to provide a current shielding device that shields the supply of current to the electric circuit in order to prevent leakage and electric shock caused by the accident. (For example, see Patent Document 1 below).

  The following Patent Document 1 discloses an electric circuit shielding device that is applied to a vehicle provided with an electric circuit having a converter and a storage battery and shields current supply from the storage battery to the converter when a collision of the vehicle is detected. Has been. In this electrical circuit shielding device, a power feeding circuit shield is provided that is driven by an explosive actuator that operates when a vehicle collision is detected. According to the operation of the feeder circuit shield, the current supply path that electrically connects the storage battery and the converter is disconnected.

JP 2011-25912 A

  However, according to the prior art, although the current supply path is cut by the operation of the feeder circuit shield, the conventional electric circuit shield device does not correspond to a high voltage environment. In other words, in an environment where the current supply source is at a high voltage, the diameter of the current supply path such as a cable becomes large, so even if the current supply path is shielded, current flows due to arc discharge after shielding. There was a fear. In addition, an unexpectedly large current flows due to the current supply source being damaged at the time of a vehicle accident, and there is a possibility that a current flows due to arc discharge after shielding. Therefore, in the prior art, there is room for improving the reliability of current shielding in the current shielding device.

  Then, an object of this invention is to provide the current shielding apparatus which can improve the reliability of current shielding.

(1) The present invention is used for a vehicle provided with an electric circuit having an electric device and a current supply source for supplying current to the electric device, and when the collision of the vehicle or the abnormality of the circuit is detected, A current shielding device that shields current supply from a current supply source to the electrical device, the cutting blade capable of cutting a current supply path that electrically connects the electrical device and the electrical circuit, and an insulating property The cutting blade is directed toward the current supply path by directly or indirectly applying a pressure in a direction toward the current supply path with respect to the storage portion that stores the substance, and the cutting blade and the insulating substance. And a pressure source that supplies the insulating material to the current supply path, and a controller that drives the pressure source when the collision or abnormality of the circuit is detected.

  According to the configuration (1), the pressure source is driven by the control unit when a collision or a circuit abnormality is detected. The pressure source moves the cutting blade toward the current supply path and supplies an insulating material to the current supply path. As the pressure source, there are various types which will be described later. For example, an igniter can be adopted. In this case, by operating the igniter when a collision or an abnormality in the circuit is detected, a high-temperature gas is generated due to the combustion of the explosive, and the cutting blade is moved toward the current supply path by the high-temperature gas, and the current supply is performed. The road can be cut. Thereby, supply of the electric current to an electric circuit can be shielded. Further, the insulating material in the housing portion is supplied onto the already cut current supply path by the high temperature gas generated by the operation of the igniter. Thereby, the insulation of an electric current supply path can be ensured. Thereby, according to this invention, the reliability of the current shielding in a current shielding apparatus can be improved.

(2) In the current shielding apparatus according to (1), the accommodating portion is disposed on the current supply path side of the pressure source, and is damaged by being applied with a pressure of a predetermined level or more or a predetermined level or higher. A deformable portion that deforms when heat is applied, and when the collision or the abnormality of the circuit is detected, the weak portion is destroyed or the deformable portion is deformed by the operation of the pressure source Thus, the insulating material may be configured to be discharged toward the current supply path.

  According to the configuration of (2) above, a part (for example, the bottom portion or the side portion) of the housing portion may be configured as a fragile portion that is destroyed by a moving body that is moved by a hydraulic cylinder that is an example of a pressure source. Alternatively, it may be configured as a deformable portion (for example, a thermoplastic resin) that is deformed by a high-temperature gas generated by operation of an igniter that is an example of a pressure source. By destroying or deforming a part of such a housing portion, the insulating substance housed in the housing portion can be discharged toward the current supply path.

(3) In the current shielding device according to (1), the housing portion forms a flow path from the pressure generation side of the pressure source toward the current supply path side while surrounding at least the pressure generation side of the pressure source. A doughnut-shaped member and, in an initial state, the weakened portion that is destroyed when a predetermined pressure or more is applied by closing the flow path of the donut-shaped member on the current supply path side of the pressure source; A deformable portion that deforms when heat is applied, and the cutting blade is disposed on the current supply path side of the fragile portion or the deformable portion to detect the collision or the abnormality of the circuit In this case, the insulating material may be discharged toward the current supply path when the fragile portion is destroyed or the deformable portion is deformed by the operation of the pressure source. .

  According to the configuration of (3) above, the same fragile part or deformable part as in (2) above can be adopted. And it becomes possible to transmit the pressure which arises by the action | operation of a pressure source to a cutting blade efficiently through the said flow path by comprising an accommodating part in the said donut shape and forming a flow path. Thereby, since the reliability of cutting of the current supply path is further improved, it is possible to provide a current shielding device in which the reliability of current shielding is improved as compared with the conventional case.

(4) The current shielding device according to any one of (1) to (3) is fixed to a base side of the cutting blade and has a width larger than a width of the cutting blade in a length direction of the current supply path. A plate-shaped moving member may be further provided.

  According to the configuration of (4) above, the moving member moves toward the current supply path together with the cutting blade by the operation of the pressure source. And the secondary cutting | disconnection with respect to the electric current supply path by a moving member is realizable with the cutting width larger than the cutting width in the primary cutting | disconnection with respect to the electric current supply path with a cutting blade. As a result, it is possible to further reduce the possibility of current flowing due to arc discharge after cutting, so that the reliability of current shielding can be further improved.

(5) In the current shielding device according to any one of (1) to (4), the pressure source preferably includes an igniter.

  According to the configuration of (5) above, the pressure source can be activated instantly and the pressure source can be reduced in weight.

(6) As another aspect, the current shielding device according to the present invention is used in a vehicle provided with an electric circuit having an electric device and a current supply source that supplies current to the electric device. When a circuit abnormality is detected, current supply from the current supply source to the electrical device is shielded, and a current supply path that electrically connects the electrical device and the electrical circuit is disconnected. A cutting blade, a housing portion that contains an insulating material, and a pressure applied directly or indirectly to the cutting blade in a direction toward the current supply path, thereby connecting the cutting blade to the current supply path. At least one first pressure source that is moved toward the current source, and applying pressure directly or indirectly to the insulating material in a direction toward the current supply path, thereby supplying the insulating substance to the current supply path. To serve And at least one second pressure source, and a controller that drives the first pressure source and the second pressure source when the collision or the abnormality of the circuit is detected. .

  According to the configuration of (6) above, when the collision or the abnormality of the circuit is detected, the first pressure source and the second pressure source are driven by the control unit. The first pressure source moves the cutting blade toward the current supply path, and the second pressure source supplies an insulating material to the current supply path. There may be one or more second pressure sources. For example, when two second pressure sources are employed, the insulating material can be supplied to the current supply path in a wider range by arranging them at different positions. For example, an igniter can be employed as the first and second pressure sources. When a collision or an abnormality in the circuit is detected, the igniter as the first pressure source is operated to generate a high-temperature gas due to the explosive combustion, and the high-temperature gas moves the cutting blade toward the current supply path. The current supply path can be cut off. Thereby, supply of the electric current to an electric circuit can be shielded. In addition, the insulating material in the housing portion is supplied to the already disconnected current supply path by the high-temperature gas generated by the operation of the igniter as the second pressure source. Thereby, the insulation of an electric current supply path can be ensured. As a result, according to the present invention, the reliability of current shielding can be improved.

(7) In the current shielding device according to (6), the housing portion is disposed on the current supply path side of the second pressure source, and is a weak portion or a predetermined portion that is destroyed when a predetermined pressure or more is applied. The deformable portion is deformed by applying the above heat, and when the collision is detected, the weak portion is destroyed or the deformable portion is deformed by the operation of the second pressure source. Accordingly, the insulating material may be discharged toward the current supply path.

  According to the configuration of (7) above, a part (for example, the bottom portion or the side portion) of the housing portion is configured as a fragile portion that is destroyed by a moving body that is moved by a hydraulic cylinder that is an example of the second pressure source. Alternatively, it may be configured as a deformable portion (for example, a thermoplastic resin) that is deformed by a high-temperature gas generated by the operation of an igniter that is an example of the second pressure source. By destroying or deforming a part of such a housing portion, the insulating material can be discharged toward the current supply path.

(8) In the current shielding device according to (7), the housing portion is formed in a cylindrical shape, and a piston is provided in the housing portion that is movable from the distal end side of the driving unit toward the current supply path side. When the collision is detected, the fragile portion is destroyed or broken by the piston being pushed from the tip end side of the driving portion toward the current supply path side by the operation of the second pressure source. The deformable portion may be deformed so that the insulating material is discharged toward the current supply path.

  According to the configuration of (8) above, when the piston is pushed into the cylindrically formed accommodating portion, a part (for example, the bottom portion or the side portion) of the accommodating portion is broken or deformed by the pressure, and the insulating property Material is released onto the current supply path. As described above, since the pressure generated by the operation of the second pressure source can be entirely received by the piston and the pressure can be transmitted to a part of the accommodating portion, it is possible to improve the release of the insulating substance.

(9) The current shielding device according to any one of (6) to (8) is fixed to the base side of the cutting blade and has a width larger than the width of the cutting blade in the length direction of the current supply path. A plate-shaped moving member may be further provided.

  According to the configuration of (9) above, the moving member moves toward the current supply path together with the cutting blade by the operation of the first pressure source. And the secondary cutting | disconnection with respect to the electric current supply path by a moving member is realizable with the cutting width larger than the cutting width in the primary cutting | disconnection with respect to the electric current supply path with a cutting blade. As a result, it is possible to further reduce the possibility of current flowing due to arc discharge after cutting, so that the reliability of current shielding can be further improved.

(10) In the current shielding device according to any one of (6) to (9), the supply direction of the insulating material by the pressure generated by the second pressure source is the movement of the cutting blade by the first pressure source. The second pressure source and the accommodating portion may be arranged so as to be parallel to the direction.

  According to the configuration of (10) above, it is possible to supply the insulating material by the operation of the second pressure source to the region including the portion of the current supply path cut by the cutting blade.

(11) In the current shielding device according to any one of (6) to (10), the supply direction of the insulating material by the pressure generated by the second pressure source is the movement of the cutting blade by the first pressure source. The second pressure source and the accommodating part may be arranged so as to intersect with the direction.

  According to the configuration of (11) above, the insulating material can be pinpointed by the operation of the second pressure source to the portion of the current supply path cut by the cutting blade.

(12) In the current shielding device according to any one of (6) to (11), at least one of the first pressure source and the second pressure source preferably includes an igniter.

  According to the configuration of (12) above, the pressure source can be activated instantly and the weight of the pressure source can be reduced.

(13) In the current shielding device according to any one of (6) to (12), when the collision or the abnormality of the circuit is detected, the control unit performs control to drive the first pressure source. It is preferable to perform control for driving the second pressure source after a predetermined time difference.

  According to the configuration of (13) above, since the insulating material is supplied by the injection of the second pressure source after the circuit is disconnected by the first pressure source, the insulating material adheres to the cut surface and the current interruption is reliably performed. be able to. Moreover, it is possible to increase the choice of the installation position of a 2nd pressure source.

  ADVANTAGE OF THE INVENTION According to this invention, the current shielding apparatus which can improve the reliability of current shielding can be provided.

It is sectional drawing which shows the current shielding apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the state by which the electric current supply path was cut | disconnected by the cutting blade in the electric current shielding apparatus of FIG. It is sectional drawing which shows the state by which the insulating material was discharge | released on the electric current supply path cut | disconnected in the electric current shielding apparatus of FIG. (A) is explanatory drawing which shows the positional relationship of one igniter which moves a cutting blade, and the other igniter which discharge | releases an insulating substance, (b) is explanatory drawing which shows the modification of (a). is there. It is a figure which shows a 2nd igniter and its peripheral structure part. It is a figure which shows the 2nd igniter and the modification of the peripheral structure part. It is a figure which shows the current shielding apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of the current shielding apparatus which concerns on 2nd Embodiment of this invention.

  Hereinafter, a current shielding device according to an embodiment of the present invention will be described with reference to the drawings. The current shielding device of this embodiment is used in a vehicle (for example, an electric vehicle using a large current) provided with an electric circuit having an electric device and a current supply source (storage battery) that supplies electric current to the electric device. When a vehicle collision or a circuit abnormality is detected, the current supply from the current supply source to the electrical equipment is shielded. In the following first embodiment, an aspect using a plurality of (for example, two) pressure sources will be described, and in the second embodiment, an aspect using one pressure source will be described.

  In the present invention, the circuit abnormality refers to, for example, a case where a short circuit, overcurrent, overvoltage, abnormal heat generation, or the like occurs in the circuit. There is no particular limitation on the system used for detecting the abnormality of the circuit. For example, a system that energizes the resistor included in the ignition unit from a terminal installed in the circuit when an abnormality occurs in the circuit. Joule heat generated by energizing the resistor burns the igniting agent in the igniting portion, and the current is interrupted.

(First embodiment)
As shown in FIG. 1, the current shielding device 100 according to the present embodiment includes an igniter 10 that is an example of a pressure source (power source), a cutting chamber 20 having an internal space, and a pressure generated by the operation of the igniter 10. When a collision is detected, a plate-shaped moving member 23 that moves in the cutting chamber 20 in one direction (downward in FIG. 1), a cutting blade 24 held by the moving member 23, and an igniter 10 and a controller 25 for driving an igniter 60 described later.

  The igniter 10 is held on the upper wall of the cutting chamber 20 so that the generated flame can be discharged toward the moving member 23 positioned below. As the igniter 10, a known igniter can be used. The igniter 10 generates a flame, and ignites (not shown) that generates a flame by igniting and burning in the interior of the igniter and a resistor (not shown) for igniting the igniter. ) Including an ignition unit 11 (drive unit) including a pair of terminal pins 12 and 12 connected to the ignition unit 11. The moving member 23 is fixed to the upper end of the cutting blade 24 and has a width larger than the width of the cutting blade 24 in the length direction of a current supply path 30 described later.

  When a vehicle collision or a circuit abnormality is detected by an acceleration sensor or the like provided in the vehicle, a predetermined amount of current is supplied to the resistor via the pair of terminal pins 12 and 12 under the control of the control unit 25. Flows. When a current flows through the resistor, Joule heat is generated in the resistor, and the igniting agent starts burning. The high-temperature flame generated by the combustion ruptures the squib cup (not shown) containing the igniting agent. In the igniter 10, the time from when a current flows to the resistor until it is activated is generally 2 milliseconds or less when a nichrome wire is used as the resistor.

  A through hole 21 is provided on one side wall of the cutting chamber 20, and a through hole 22 is provided on the other side wall. The current supply path 30 is bridged through the through holes 21 and 22. The current supply path 30 is made of, for example, a metal plate or a metal wire, and one end thereof is connected to a storage battery (not shown) of an electric circuit, and the other end is connected to an electric device (not shown) of the vehicle.

  Further, as shown in FIG. 5, the current shielding device 100 includes at least one pressure source (power source) that supplies the insulating material 64 accommodated in the tubular accommodating portion 63 to the current supply path 30 (see FIG. 1). ) As an example. Since the igniter 60 is the same as the igniter 10 described above, the igniter 60 includes an igniter 61 and a pair of terminal pins 62 and 62, although details are omitted.

  The accommodating part 63 is arrange | positioned under the igniter 60, and has a bottom part which consists of a weak part or the deformable part 63a (for example, thing made from a thermoplastic resin) which deform | transforms with a heat | fever. The deformable portion 63a is deformed to such an extent that the high temperature flame and high-pressure combustion gas generated by the operation of the igniter 60 are broken or a hole is formed, so that the insulating material 64 is discharged to the outside. ing. As a modification, the housing 63 may be a deformable portion (for example, made of a thermoplastic resin) that is deformed to such an extent that the entire housing is broken or a hole is formed. Alternatively, the deformable portion may be deformed so that a part thereof is broken or a hole is formed.

  As the insulating material 64, a compound having a low dielectric constant is generally preferred. For example, the insulating material 64 is preferably a polymer material, a resin material, or a hydrocarbon. In the case of a liquid, a compound having a higher viscosity is preferable because it can remain in the current interrupting portion and can retain insulation.

  Examples of the polymer material include polyamide, polyethylene, polyisobutylene, polyvinyl chloride, polychlorotrifluoroethylene, polyvinyl acetate, polyacrylate, polystyrene, polyethylene terephthalate, polycarbonate, polyphenylene ether, polyphenylene oxide resin, and modified polyphenylene ether (m -PPE), ethylene tetrafluoroethylene copolymer, polyvinylidene fluoride, polypropylene, polymethylpentene, polyphenylene sulfide, polybutylene terephthalate, polybutylene, polycaprolactam, polymonochloro, polystyrol, polysulfonic acid, polyvinyl alcohol, cellulose acetate, cellulose nitrate , Ethyl cellulose, dextrin, poly Chirenperetto, and polypropylene pellets, and polyethylene pellets.

  Examples of the resin material include alkyd resins, epoxy resins, tetrafluoroethylene resins, vinyl fluoride resins, phenol resins, urea resins, melamine resins, unsaturated polyester resins, vinyl ester resins, diallyl phthalate resins, epoxy resins, Silicone resin, xylene resin, amino resin, aniline resin, guanamine resin, acrylic resin, polyetherimide resin, acrylonitrile / butadiene / styrene (ABS) resin, ETFE resin, fluorine resin, PET resin, polyacetal resin, polyamideimide resin, polyimide Resins, polyurethane resins, PEK resins, polyethersulfone resins, polyetherimide resins, polyolefin resins, polytetrafluoroethylene resins, isobutyl resins, and PEEK resins.

  Examples of the hydrocarbon include cyclohedan, cycloheptasiloxane, cyclohexane, cyclopentane, decane, decylene, dimethylpentane, dimethyl-2-hexane, dimethylheptane, dimethylpentane, 2-methyl-2-butene, butane, kerosene, and isooctane. , Gasoline, dipentene, styrene, xylene, mentsonol, hexane, naphthalene, pentadiene, pentane, liquefied petroleum gas, dodecane, dodecine, ethylene pentane, petrolatum, xylene, turpentine oil, undecane, docosane, cis-3-hexane, acetylene, dichlorostyrene , Ethylcyclobutane, heptane, hexylene, methylcyclopentane, trimethyl-3-heptene, octane, trans-3-hexyne, methylbutane, and microhexane Is mentioned.

  Further, as another example of the insulating material 64, an aromatic compound, a halogen compound, or a gas can be used.

  Examples of the aromatic compound include benzene, ethyltoluene, isobutylbenzene, diphenylmethane, diphenylethane, diphenyl, isopropylbenzene, cumene, thiophene, trimethylbenzene, trinitrobenzene, decahydronaphthalene, triphenylmethane, cymene, dichlorobenzene, Examples include limonene, camphene, diethyl succinyl succinate, dimethylquinoxaline, dioxane, eugenol, mesitylene, nitrotoluene, nonane, cymene, phenanthrene, phenylurethane, phenylethylene, propylbenzene, 1,2,4-trimethylbenzene, quinoline, and terpineol. It is done.

  Examples of the halogen compound include hydrogen arsenide, bromine, chlorine, fluorine, boron bromide, freon, trichloropropane, and naphtha.

  Examples of the gas include argon, carbon dioxide, carbon disulfide, dinitrogen monoxide, dinitrogen tetroxide, nitrogen, liquid air, hydrogen, methane, deuterium, oxygen, nitrous oxide, sulfur hexafluoride, and Freon. , And carbon dioxide.

  Furthermore, other examples of the insulating material 64 include aluminum powder, ammonia, carbon tetrachloride, cholesterol, isoprene, lead acetate, lead tetrachloride, mercury, diethyl mercury, phosphorus, phosphorus pentachloride, diethyl zinc, copper oleate, Cordierite, cotton, aluminum hydroxide, aluminum oleate, asphalt, diimylamine, diisoamyl, diisoamylene, aluminum fluoride, caproic acid, caprolactam, cyclohexanecarboxylic acid, decamethylcyclopentasiloxane, decamethyltetrasiloxane, diisopropylamine, dodecamethyl Cyclohexylsiloxane, dodecamethylpentasiloxane, ebonite, ethylene tetrafluoride, ferric oleic acid, ferrochrome, fly ash, acid clay, glutanium tetrachloride, enanthate, Samethyldisiloxane, hydrocyanic acid, isovaleric acid, isobutyric acid, isophthalic acid, isopropylamine, linoleic acid, methylal, micanite, butyl formate, butyl acetate, octamethylcyclotetrasiloxane, oleic acid, palmitic acid, cycloparaffin, Paraffin, chlorinated paraffin, perlite, phenyl-1-propane, aluminum silicate, silicon tetrachloride, silicon oil, sodium oleate, sodium phosphate, stearic acid, stearin, tetrachloroethylene, tetrafluoroethylene, tetranitromethane, titanium chloride, Triethylaminium, zinc oxide (II), valeric acid, shell sand, ferrosilicon, nitrogen (liquid), ferrous (powder), iron oxide (II), toxeal, telecleric acid, terephthalic acid, granulated sugar (powder), Bi fluid, PE cube, calcium carbonate, polycarbonate powder, propane (liquid), Sevin, talc, calcium hypochlorite, and calcium phosphate and the like.

  Among the insulating materials 64 as described above, a thermosetting resin that is hardened by the heat of the explosive and can close the cut portion of the current supply path 30 is more preferable. Therefore, as the insulating material 64, phenol resin, melamine resin, urea resin, epoxy resin, unsaturated polyester resin, alkyd resin, silicone resin, urethane resin, diallyl phthalate resin, furan resin, ketone resin, xylene resin, polyimide resin Polybismaleimide / triazine, (benzo) guanamine resin, and vinyl ester resin are preferable, and an epoxy resin having good adhesion to metal is more preferable. Moreover, in the said epoxy resin, there exist one-component property which the hardening | curing agent contained in this agent reacts and cures by heating, and two-component property which this agent and a hardening | curing agent harden | cure by mixing. Either of them can be selected as appropriate, but since a reaction may be caused by heat at the time of mounting on a vehicle, a substance that is two-part from the environmental resistance and is mixed and solidified by the thermal energy of the explosive is preferable.

  The insulating material 64 preferably contains a flame retardant. Examples of the flame retardant include metal fillers and halogen compounds (such as bromine compounds).

  Here, the positional relationship between the igniter 10 that moves the cutting blade 24 and the igniter 60 that releases the insulating material 64 will be described. As shown in FIG. 4A, when the position of the igniter 10 (for example, the position of the lower end) is L1, and the position of the igniter 60 (for example, the position of the lower end) is L2, the position L1 and the position L2 are approximately The igniters 10 and 60 may be arranged so that they are set at the same height position and the supply direction of the insulating material 64 by the igniter 60 is parallel to the moving direction of the cutting blade 24 by the igniter 10. . In FIG. 4A, the current supply path is indicated by reference numeral 30, but for convenience of explanation, it is indicated by a solid line.

  Further, instead of the above-described cutting chamber 20, as shown in FIG. 4B, a cutting chamber including an upper surface portion 51 and an inclined portion 52 connected to the upper surface portion 51 so as to intersect the upper surface portion 51. 50 may be adopted. In this case, the position (for example, the lower end position) L4 of the igniter 60 is set to the inclined portion 52, and the position (for example, the lower end position) L3 of the igniter 10 is set to the upper surface portion 51. Thereby, the supply direction of the insulating material 64 by the igniter 60 intersects the moving direction of the cutting blade 24 by the igniter 10. In FIG. 4B, the current supply path is indicated by reference numeral 130, but for convenience of explanation, it is indicated by a solid line.

  In the above configuration, when a vehicle collision or a circuit abnormality is detected, a predetermined amount of current is supplied to the pair of terminal pins 12 and 12 of the igniter 10 under the control of the control unit 25. As shown in FIG. 1, the moving member 23 and the cutting blade 24 move downward due to the pressure of the flame emitted from the tip portion 11 a generated by the operation of the ignition unit 11.

  Then, the current supply path 30 is primarily cut by the cutting blade 24, and then, as shown in FIG. 2, the moving member has a cutting width larger than the cutting width in the primary cutting with respect to the current supply path 30 by the cutting blade 24. The secondary cutting of the current supply path 30 by 23 is realized.

  Thereafter, a predetermined amount of current is supplied to the pair of terminal pins 62 and 62 (see FIG. 5) of the igniter 60 (see FIG. 5) under the control of the control unit 25. As a result, the ignition part 61 is activated, and the deformable part 63a is destroyed or deformed by the high-temperature flame generated thereby. As shown in FIG. 3, the device 60 is supplied onto the disconnected current supply path 30. Thereby, the current supply path 30 is insulated.

  Thus, according to the current shielding apparatus 100 of the present embodiment, the igniter 10 and the igniter 60 are driven by the control unit 25 when a vehicle collision or a circuit abnormality is detected. The igniter 10 moves the cutting blade 24 toward the current supply path 30, and the igniter 60 supplies the insulating material 64 onto at least a cut portion of the current supply path 30. Specifically, when a collision or a circuit abnormality is detected, the igniter 10 is operated to generate a high-temperature gas due to the explosive combustion, and the high-temperature gas directs the cutting blade 24 toward the current supply path 30. It can be made to move and the said current supply path 30 can be cut | disconnected. Thereby, supply of the electric current to an electric circuit can be shielded. Further, the insulating material 64 in the housing portion 63 is supplied onto the already-cut current supply path 30 by the high-temperature gas generated by the operation of the igniter 60. As a result, the insulation of the current supply path 30 after the operation of the current shielding device 100 can be ensured. Thereby, the current shielding apparatus 100 can improve the reliability of current shielding as compared with the conventional case. The igniter 60 may be one or plural. For example, when two igniters 60 are employed, the insulating material 64 can be supplied onto the current supply path 30 in a wider range by arranging them at different positions.

  In the present embodiment, the deformable portion 63 a of the housing portion 63 can be configured as a deformable portion (thermoplastic resin) that is deformed by the high-temperature gas generated by the operation of the igniter 60. Thereby, the insulating material 64 can be easily discharged toward the current supply path 30 by deforming the deformable portion 63a of the accommodating portion 63.

  Moreover, in this embodiment, the secondary cutting | disconnection with respect to the current supply path 30 by the moving member 23 is realizable with the cutting width larger than the cutting width in the primary cutting | disconnection with respect to the current supply path 30 by the cutting blade 24. FIG. . As a result, it is possible to further reduce the possibility of current flowing due to arc discharge after cutting, so that the reliability of current shielding can be further improved.

  Further, in the present embodiment, the position L1 of the igniter 10 and the position L2 of the igniter 60 are set at substantially the same height position, and the supply direction of the insulating material 64 by the igniter 60 is cut by the igniter 10. The igniters 10 and 60 can be arranged so as to be parallel to the moving direction of the blade 24. Thereby, the insulating material 64 can be supplied by the operation of the igniter 60 to the region including the portion of the current supply path 30 cut by the cutting blade 24.

  In the present embodiment, the position L4 of the igniter 60 is set in the inclined portion 52, and the position L3 of the igniter 10 is set in the upper surface portion 51, thereby igniting the supply direction of the insulating material 64 by the igniter 60. It is possible to cross the moving direction of the cutting blade 24 by the vessel 10. Thereby, it is possible to pinpoint the supply of the insulating material 64 by the operation of the igniter 60 to the portion of the current supply path 30 cut by the cutting blade 24.

  Further, in the present embodiment, the igniter 10 as the first pressure source is employed, and the igniter 60 as the second pressure source is employed. Thereby, while being able to start these pressure sources instantly, the weight reduction of the said pressure source can be achieved.

  Further, in the present embodiment, it is also preferable that the control unit controls the second pressure source to be driven with a time difference after the first pressure source is driven. In the present embodiment, in order to ensure the disconnection of the circuit by the first pressure source, the distance from the first pressure source to the circuit is preferably as long as possible. This is because the cutting blade can be accelerated more by increasing the moving distance of the cutting blade, and the circuit can be cut reliably. From this, when the first pressure source and the second pressure source operate simultaneously in an embodiment where the distance from the first pressure source to the circuit is longer than the distance from the second pressure source to the circuit, the insulating material is It may adhere to the circuit first, and the insulating material may not adhere to the cut surface of the circuit. However, by providing the time difference, an insulating material adheres to the cut surface of the circuit cut by the first pressure source, and the current blocking effect by the insulating material is reliably exhibited. In addition, since the second pressure source larger than the first pressure source contains the insulating material, the insulating material needs to adhere to the cut surface of the cut circuit because of the size thereof. Since the injection angle of the insulating material from the source is important, the installation position of the second pressure source is limited. By providing the time difference, it is possible to install the second pressure source at a location closer than the distance from the first pressure source to the circuit, and the selection range of the installation position of the second pressure source increases.

  The method for discharging the insulating material may be modified as follows. FIG. 6 is a diagram showing an igniter 160 as a second pressure source and its peripheral components. In FIG. 6, the parts denoted by the same reference numerals in the last two digits as in FIG. 5 are the same as those described in FIG.

  As shown in FIG. 6, a piston 165 is provided below the igniter 160 as the second pressure source in the housing portion 163. When a collision or a circuit abnormality is detected, the piston 165 is pushed downward by the pressure generated by the operation of the igniter 160, so that the deformable portion 163a of the housing portion 163 is broken or deformed, and a hole is opened. The sexual substance 164 is configured to be discharged toward the current supply path 30 (see FIG. 1). As described above, since the pressure generated by the operation of the igniter 160 is entirely received by the piston 165 and the pressure can be transmitted to the deformable portion 163a, the release property of the insulating substance 164 can be improved.

(Second Embodiment)
Next, a current shielding device 200 according to the second embodiment will be described with reference to the drawings.

  FIG. 7 is a cross-sectional view showing a current shielding device according to the second embodiment. In FIG. 7, the parts denoted by the same reference numerals in the last two digits as in FIG. 3 are the same as those described in FIG.

  As shown in FIG. 7, in the current shielding apparatus 200 according to the second embodiment, a part (lower part) of the igniter 110 and the insulating substance 264 are disposed in the cutting chamber 120, that is, in the same chamber. Yes. An accommodation portion 141 that accommodates the insulating material 264 is provided in the upper portion of the cutting chamber 120. This accommodating part 141 is arrange | positioned under the igniter 110, and has the deformable part 142 comprised with the thermoplastic resin. The cutting blade 124 is provided on the lower surface of the deformable portion 142.

  In such a configuration, when a vehicle collision or a circuit abnormality is detected, the igniter 110 is driven by the control unit 125, and the cutting blade 124 is directed toward the current supply path 230 by the high-temperature gas generated thereby. The current supply path 230 can be disconnected by moving. Thereby, supply of the electric current to an electric circuit can be shielded. Further, the deformable portion 142 made of a thermoplastic resin is deformed or destroyed by the high-temperature gas, so that a hole is opened, and the insulating material 264 is supplied onto the current supply path 230 that has already been cut. As a result, the insulation of the current supply path 230 after the operation of the current shielding device 200 can be ensured. Thereby, the current shielding apparatus 200 can improve the reliability of current shielding as compared with the conventional case. Furthermore, in the current shielding device 200, it is sufficient to use one igniter 110 as a pressure source for satisfying the functions of cutting the current supply path 230 and releasing the insulating substance 264.

  Note that the current shielding device 200 of FIG. 7 can be modified as follows.

  FIG. 8 is a view showing a modification of the current shielding device 200 of FIG. 8, parts having the same reference numerals as those in FIG. 7 are the same as those shown in FIG.

  Also in the current shielding device 300 shown in FIG. 8, a part (lower part) of the igniter 210 and the insulating material 364 are disposed in the cutting chamber 220, that is, in the same chamber. A housing portion 241 for housing the insulating material 364 is provided in the upper portion of the cutting chamber 220. The housing portion 241 is disposed as a donut-shaped member that is disposed below the igniter 210 and surrounds at least the lower part of the igniter 210. Specifically, the housing portion 241 is made of a thermoplastic resin, and is made of a thermoplastic resin and a cylinder portion 243 for forming the flow path 221 below the igniter 210 (below the tip portion 211a of the ignition portion 211). The deformable portion 242 is provided. The deformable portion 242 has a deformable portion 242a formed at the bottom so as to close the flow path 221 and deformable by heat from a flame. The cutting blade 224 is provided on the lower surface of the deformable portion 242a.

  In such a configuration, when a collision or circuit abnormality is detected, the igniter 210 is driven by the control unit 225, and the cutting blade 224 is moved toward the current supply path 330 by the high-temperature gas generated thereby. The current supply path 330 can be cut. Thereby, supply of the electric current to an electric circuit can be shielded. Further, the deformable portion 242 and the cylindrical portion 243 made of thermoplastic resin are deformed or destroyed by the high-temperature gas, so that a hole is opened, and the insulating material 364 is supplied onto the already cut current supply path 330. The As a result, the insulation of the current supply path 330 after the operation of the current shielding device 200 can be ensured. Thereby, the current shielding apparatus 200 can improve the reliability of current shielding as compared with the conventional case. Furthermore, by forming the accommodating portion 241 as a donut-shaped member and forming the flow path 221, the cutting blade 224 does not lose much pressure due to the operation of the igniter 210 via the flow path 221. Can be transmitted. As a result, the current shielding device 200 can further improve the reliability of cutting of the current supply path 330, so that the reliability of current shielding can be improved as a whole. Further, in the current shielding device 300 as well, it is sufficient to use one igniter 210 as a pressure source for satisfying the functions of cutting the current supply path 330 and releasing the insulating substance 364. It can be made lighter than the device.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the first embodiment and the second embodiment, the igniter 10 is used as the first pressure source and the igniter 60 is used as the second pressure source. However, the present invention is not limited to this. For example, a pressure source such as a hydraulic cylinder may be adopted as the pressure source and the second pressure source. Any other pressure source may be used as long as it generates a predetermined pressure. For example, (1) a flammable liquid, solid or gas is ignited to generate a pressure by combustion. (Gas generators, micro gas generators, etc.), (2) generating electromagnetic force and generating pressure due to collision by flying magnet members with attractive or repulsive force by magnetic force, (3) having urging force Examples include a method in which an elastic body such as a spring or rubber is moored, and then the mooring is released by using a motor or the like to generate a pressure due to a collision. As the pressure source, it is preferable to use an igniter from the viewpoint of effective use of space, weight reduction, and cost.

  In the first embodiment and the second embodiment, the deformable portion 63a and the deformable portion 242a can be configured as those that are deformed by high-temperature gas generated by the operation of the igniter 60 (for example, thermoplastic resin). It was. However, the present invention is not limited to this. As described above, when other pressure sources such as a hydraulic cylinder are used as the first pressure source and the second pressure source, the deformable portion 63a and the deformable portion 242a are You may comprise as a weak part destroyed by the moving body moved by the said hydraulic cylinder.

10, 60, 110, 160, 210 Igniter 11, 61, 111, 161, 211 Ignition unit (drive unit)
11a, 61a, 111a, 161a, 211a (Ignition part) tip 12, 62, 112, 162, 212 Terminal pin 20, 50, 120, 220 Cutting chamber 21, 22 Through hole 23 Moving member 24, 124 Cutting blade 25 , 125, 225 Control unit 30, 130, 230, 330 Current supply path 51 Upper surface portion 52 Inclined portion 63, 163 Housing portion 63a, 163a, 142, 242, 242a Deformable portion 64, 164, 264, 364 Insulating material 100 , 200, 300 Current shielding device 141, 241 Housing portion 165 Piston 221 Channel 243 Tube portion L1, L2, L3, L4 Position of igniter

Claims (13)

The electric device is used in a vehicle provided with an electric circuit having a current supply source for supplying electric current to the electric device, and the electric device from the current supply source when a collision of the vehicle or an abnormality of the circuit is detected A current shielding device for shielding current supply to
A cutting blade capable of cutting a current supply path electrically connecting the electrical device and the electrical circuit;
A receiving portion for containing an insulating material;
The cutting blade is moved toward the current supply path by directly or indirectly applying pressure to the cutting blade and the insulating substance in a direction toward the current supply path, and the insulating substance is used. A pressure source for supplying to the current supply path;
And a controller that drives the pressure source when the collision or the abnormality of the circuit is detected. The accommodating portion is disposed on the current supply path side of the pressure source, and has a fragile portion that is destroyed when a pressure of a predetermined level or higher is applied, or a deformable portion that is deformed by a heat of a predetermined level or higher. And
When the collision or the abnormality of the circuit is detected, the fragile portion is destroyed or the deformable portion is deformed by the operation of the pressure source, so that the insulating material is released toward the current supply path. The current shielding device according to claim 1, wherein the current shielding device is configured as described above. The accommodating portion is
A donut-shaped member that forms a flow path from the pressure generation side of the pressure source toward the current supply path side while surrounding at least the pressure generation side of the pressure source;
In an initial state, the flow path of the doughnut-shaped member is closed on the current supply path side of the pressure source, and a weakened portion that is destroyed when a predetermined pressure or more is applied or a predetermined heat or more is applied. A deformable part that deforms in some cases,
Have
The cutting blade is disposed on the current supply path side of the fragile portion or the deformable portion,
When the collision or the abnormality of the circuit is detected, the fragile portion is destroyed or the deformable portion is deformed by the operation of the pressure source, so that the insulating material is released toward the current supply path. The current shielding device according to claim 1, wherein the current shielding device is configured as described above.   The plate-shaped moving member which is fixed to the base side of the said cutting blade, and has a width | variety larger than the width | variety of the said cutting blade in the length direction of the said electric current supply path is further provided. The current shielding device according to claim 1.   The current shielding apparatus according to claim 1, wherein the pressure source includes an igniter. The electric device is used in a vehicle provided with an electric circuit having a current supply source for supplying electric current to the electric device, and the electric device from the current supply source when a collision of the vehicle or an abnormality of the circuit is detected A current shielding device for shielding current supply to
A cutting blade capable of cutting a current supply path electrically connecting the electrical device and the electrical circuit;
A receiving portion for containing an insulating material;
At least one first pressure source for moving the cutting blade toward the current supply path by directly or indirectly applying pressure to the cutting blade in a direction toward the current supply path;
At least one second pressure source for supplying the insulating substance to the current supply path by directly or indirectly applying pressure to the insulating substance in a direction toward the current supply path;
A current shielding apparatus comprising: a control unit that drives the first pressure source and the second pressure source when the collision or the abnormality of the circuit is detected. The accommodating portion is disposed on the current supply path side of the second pressure source, and is a fragile portion that is destroyed by applying a predetermined pressure or more, or a deformable portion that is deformed by applying predetermined heat or more. Have
When the collision or the abnormality of the circuit is detected, the fragile portion is destroyed or the deformable portion is deformed by the operation of the second pressure source, so that the insulating substance is directed toward the current supply path. The current shielding device according to claim 6, wherein the current shielding device is configured to be discharged. The accommodating portion is formed in a cylindrical shape,
In the housing portion, a piston is provided that is movable from the distal end side of the drive portion toward the current supply path side,
When the collision or the abnormality of the circuit is detected, the fragile portion is destroyed by pushing the piston toward the current supply path from the distal end side of the driving portion by the operation of the second pressure source. The current shielding device according to claim 7, wherein the deformable portion is deformed so that the insulating substance is discharged toward the current supply path.   The plate-shaped moving member which is fixed to the base side of the said cutting blade, and has a width | variety larger than the width | variety of the said cutting blade in the length direction of the said electric current supply path is further provided. The current shielding device according to claim 1.   The second pressure source and the accommodating portion are arranged so that the supply direction of the insulating material by the pressure generated by the second pressure source is parallel to the moving direction of the cutting blade by the first pressure source. The current shielding device according to any one of claims 6 to 9, wherein the current shielding device is provided.   The second pressure source and the accommodating portion are arranged so that the supply direction of the insulating material by the pressure generated by the second pressure source intersects the moving direction of the cutting blade by the first pressure source. The current shielding device according to any one of claims 6 to 10, wherein   12. The current shielding device according to claim 6, wherein at least one of the first pressure source and the second pressure source includes an igniter. When the collision or the abnormality of the circuit is detected, the control unit performs control for driving the second pressure source with a predetermined time difference after performing control for driving the first pressure source. The current shielding device according to claim 6, wherein the current shielding device is a part of the current shielding device.

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