WO2017061458A1 - Dispositif fusible - Google Patents

Dispositif fusible Download PDF

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Publication number
WO2017061458A1
WO2017061458A1 PCT/JP2016/079599 JP2016079599W WO2017061458A1 WO 2017061458 A1 WO2017061458 A1 WO 2017061458A1 JP 2016079599 W JP2016079599 W JP 2016079599W WO 2017061458 A1 WO2017061458 A1 WO 2017061458A1
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WO
WIPO (PCT)
Prior art keywords
fuse element
melting point
cooling member
fuse
element according
Prior art date
Application number
PCT/JP2016/079599
Other languages
English (en)
Japanese (ja)
Inventor
吉弘 米田
裕治 古内
Original Assignee
デクセリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016004691A external-priority patent/JP2017073373A/ja
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Priority to KR1020187007640A priority Critical patent/KR102026035B1/ko
Priority to CN201680056025.0A priority patent/CN108028158B/zh
Priority to US15/766,870 priority patent/US10727019B2/en
Publication of WO2017061458A1 publication Critical patent/WO2017061458A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0039—Means for influencing the rupture process of the fusible element
    • H01H85/0047—Heating means
    • H01H85/0056—Heat conducting or heat absorbing means associated with the fusible member, e.g. for providing time delay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/11—Fusible members characterised by the shape or form of the fusible member with applied local area of a metal which, on melting, forms a eutectic with the main material of the fusible member, i.e. M-effect devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/17—Casings characterised by the casing material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H2085/0414—Surface mounted fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0039—Means for influencing the rupture process of the fusible element
    • H01H85/0047—Heating means
    • H01H85/006—Heat reflective or insulating layer on the casing or on the fuse support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0039—Means for influencing the rupture process of the fusible element
    • H01H85/0047—Heating means
    • H01H85/0069—Heat reflective or insulating filler, support, or block forming the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/06—Fusible members characterised by the fusible material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a fuse element that is mounted on a current path and cuts off the current path by fusing, and particularly relates to a fuse element that is reduced in size, reduced in resistance, and capable of handling a large current.
  • This application is based on Japanese Patent Application No. 2015-201383 filed on October 9, 2015 in Japan and Japanese Application No. 2016-004691 filed on January 13, 2016 in Japan. This application claims priority and is incorporated herein by reference.
  • a fuse element that melts by self-heating when a current exceeding the rating flows and interrupts the current path has been used.
  • the fuse element for example, a holder-fixed fuse in which solder is enclosed in a glass tube, a chip fuse in which an Ag electrode is printed on the surface of a ceramic substrate, or a screw fixing in which a part of a copper electrode is thinned and incorporated in a plastic case or Plug-in fuses are often used.
  • a high melting point solder containing Pb having a melting point of 300 ° C. or higher is preferable for the fuse element in terms of fusing characteristics so as not to melt by the heat of reflow.
  • Pb-containing solder is only limitedly recognized, and it is considered that the demand for Pb-free solder will increase in the future.
  • the fuse element is required to be able to be surface-mounted by reflow and have excellent mountability to the fuse element, and to be able to handle a large current by raising its rating.
  • a fuse element using a metal having a high melting point and low resistance such as Cu has also been proposed.
  • This type of fuse element is formed in a rectangular plate shape and has a structure in which a width is partially narrowed at a substantially central portion in the longitudinal direction.
  • a fuse element having a wire-like structure thinner than the electrode size as a whole has been proposed.
  • a narrow portion with a narrowed width is made to be a shut-off portion that increases the resistance and shuts off self-heating.
  • an object of the present invention is to provide a fuse element capable of achieving a high rating by reducing the resistance of the fuse element and reducing the size.
  • a fuse element according to the present invention includes a fuse element and a cooling member, and the fuse element is separated from the cooling member by a heat blocking portion that is melted by heat.
  • a low thermal conductivity portion having low conductivity and a high thermal conductivity portion having a relatively high thermal conductivity in contact with or close to the cooling member are provided at portions other than the blocking portion.
  • the present invention by surrounding the periphery of the interruption portion of the fuse element with the cooling member, the heat generation at the time of overcurrent of the fuse element is suppressed and the rated current is increased, and the influence on the terminal portion is suppressed, Miniaturization can be achieved.
  • FIG. 1A and 1B are diagrams showing a fuse element to which the present invention is applied.
  • FIG. 1A is an external perspective view
  • FIG. 1B is a cross-sectional view.
  • 2A is an external perspective view showing a cooling member fitted with a fuse element
  • FIG. 2B is an external perspective view of the cooling member.
  • FIG. 3A is an external perspective view showing the fuse element in which the blocking portion is blown
  • FIG. 3B is a cross-sectional view showing the fuse element in which the fuse element is blown.
  • 4A and 4B are cross-sectional views showing other forms of the fuse element to which the present invention is applied.
  • FIG. 1A is an external perspective view
  • FIG. 1B is a cross-sectional view
  • 2A is an external perspective view showing a cooling member fitted with a fuse element
  • FIG. 2B is an external perspective view of the cooling member.
  • FIG. 3A is an external perspective view showing the fuse element in which the blocking portion is blown
  • FIG. 3B is
  • FIG. 5 is a cross-sectional view showing a fuse element in which a fuse element is held by a support member on which a cooling member made of a metal material is formed.
  • FIG. 6 is a cross-sectional view showing another embodiment of the fuse element to which the present invention is applied.
  • FIG. 7 is a cross-sectional view showing another embodiment of the fuse element to which the present invention is applied.
  • 8A and 8B are diagrams showing another form of the fuse element to which the present invention is applied.
  • FIG. 8A is an external perspective view of the cooling member
  • FIG. 8B shows the cooling member fitted with the fuse element. It is an external appearance perspective view
  • (C) is an external perspective view of a fuse element.
  • FIG. 9 is an external perspective view showing a cooling member in which a groove portion shorter than the width of the blocking portion of the fuse element is formed.
  • FIG. 10 is an external perspective view showing a cooling member in which grooves are intermittently formed along the blocking portion of the fuse element.
  • FIG. 11A is an external perspective view of a cooling member in which a cylindrical fuse element is disposed, and FIG. 11B is an external perspective view of a fuse element using the cylindrical fuse element.
  • 12A is an external perspective view showing a cooling member in which three fuse elements are arranged in parallel, and FIG. 12B is an external perspective view of a fuse element in which three fuse elements are arranged in parallel.
  • FIG. 13A is an external perspective view showing a cooling member in which high melting point fuse elements are arranged in parallel between fuse elements, and FIG.
  • FIG. 13B is a perspective view in which high melting point fuse elements are arranged in parallel between fuse elements.
  • FIG. FIG. 14 is a cross-sectional view showing a fuse element in which a metal layer is formed on the contact surface of the cooling member with the fuse element.
  • FIG. 15 is a cross-sectional view showing a fuse element in which an adhesive layer is formed on the contact surface of the cooling member with the fuse element.
  • FIG. 16 is a cross-sectional view showing a fuse element deformed by melting and flowing of a low melting point metal.
  • FIG. 17A is an external perspective view showing a cooling member in which a fuse element in which a deformation restricting portion is formed is arranged, and FIG.
  • FIG. 17B is a cross-sectional view of a fuse element using the fuse element in which the deformation restricting portion is formed.
  • 18A is an external perspective view showing a cooling member in which the terminal portion of the fuse element is formed on the back surface side
  • FIG. 18B is a fuse element in which the terminal portion of the fuse element is formed on the back surface side of the cooling member.
  • FIG. 19A is an external perspective view showing a cooling member in which the terminal portion of the fuse element is formed outside
  • FIG. 19B is a cross-sectional view of the fuse element in which the terminal portion of the fuse element is formed outside the cooling member.
  • FIG. 20A is a cross-sectional view of the fuse element in which a non-through hole is formed before reflow mounting
  • FIG. 20B is a cross-sectional view of the fuse element shown in FIG. 20A after reflow mounting.
  • FIG. 21A is a cross-sectional view showing the fuse element in which the through hole is filled with the second refractory metal layer
  • FIG. 21B is the second refractory metal layer in the non-through hole.
  • FIG. 22A is a cross-sectional view showing a fuse element having a through hole having a rectangular cross section
  • FIG. 22B is a cross sectional view showing a fuse element having a non-through hole having a rectangular cross section. It is.
  • FIG. 23 is a cross-sectional view showing a fuse element in which a second refractory metal layer is provided up to the upper side of the opening end side of the hole.
  • FIG. 21A is a cross-sectional view showing the fuse element in which the through hole is filled with the second refractory metal layer
  • FIG. 21B is the second refractory metal layer in the non-through hole.
  • FIG. 24A is a cross-sectional view showing a fuse element formed with non-through holes facing each other
  • FIG. 24B is a cross-sectional view showing a fuse element formed without making non-through holes face each other.
  • FIG. 25 is a cross-sectional view showing a fuse element in which a first high melting point particle is mixed in a low melting point metal layer.
  • FIG. 26A is a cross-sectional view of the fuse element in which the low melting point metal layer is mixed with the first high melting point particle having a particle diameter smaller than the thickness of the low melting point metal layer before the reflow mounting
  • FIG. FIG. 27 is a cross-sectional view of the fuse element shown in FIG. 26A after reflow mounting.
  • FIG. 26A is a cross-sectional view showing a fuse element formed with non-through holes facing each other
  • FIG. 24B is a cross-sectional view showing a fuse element formed without making non-through holes face each other.
  • FIG. 25 is a cross-sectional view showing
  • FIG. 27 is a cross-sectional view showing a fuse element in which second high melting point particles are press-fitted into a low melting point metal layer.
  • FIG. 28 is a cross-sectional view showing a fuse element in which second refractory particles are press-fitted into a first refractory metal layer and a low refractory metal layer.
  • FIG. 29 is a cross-sectional view showing a fuse element in which protruding edges are formed at both ends of the second high melting point particle.
  • FIG. 30 is a circuit diagram of the fuse element, where (A) shows before the fuse element is blown and (B) shows after the fuse element is blown.
  • FIG. 31A is a cross-sectional view showing a fuse element in which a heating element is formed on a cooling member
  • FIG. 31B is a circuit diagram
  • FIG. 32A is a cross-sectional view showing a fuse element in which a heating element extraction electrode is formed on an insulating layer covering the heating element
  • FIG. 32B is a circuit diagram
  • FIG. 33A is a cross-sectional view showing a fuse element using a fuse element provided with a plurality of blocking portions
  • FIG. 33B is a circuit diagram.
  • FIG. 34 is a cross-sectional view showing an example of a fuse element using a fuse element in which a recess is formed.
  • FIG. 35 is a perspective view showing a fuse element using a fuse element in which a recess is formed, omitting one cooling member.
  • FIG. 36 is an external perspective view showing an example of a fuse element using a fuse element in which a recess is formed.
  • FIG. 37 is a cross-sectional view showing an example of a fuse element using a fuse element in which a recess is formed.
  • FIG. 38A is a cross-sectional view showing a state where the fuse element of the fuse element shown in FIG. 34 is blown
  • FIG. 38B is a perspective view showing the state where the fuse element is blown out with one cooling member omitted. It is.
  • FIG. 38A is a cross-sectional view showing a state where the fuse element of the fuse element shown in FIG. 34 is blown
  • FIG. 38B is a perspective view showing the state where the fuse element is blown out with one cooling member omitted. It is.
  • FIG. 38A is a cross-sectional view showing
  • FIG. 39 is a cross-sectional view showing an example of a fuse element using a fuse element having both ends as terminal portions.
  • FIG. 40 is a perspective view showing a fuse element using a fuse element having both ends as terminal portions, omitting one cooling member.
  • FIG. 41 is an external perspective view showing an example of a fuse element using a fuse element having both ends as terminal portions.
  • FIG. 42 is a cross-sectional view showing an example of a fuse element using a fuse element provided with a deformation restricting portion.
  • FIG. 43 is a perspective view showing a fuse element using a fuse element provided with a deformation restricting portion, omitting one cooling member.
  • FIG. 44 is an external perspective view showing an example of a fuse element using a fuse element provided with a deformation restricting portion.
  • FIG. 45 is a cross-sectional view showing an example of a fuse element in which a terminal portion is provided on the back surface of the cooling member.
  • 46A is a perspective view showing a fuse element in which three fuse elements are arranged in parallel, with one cooling member omitted, and FIG. 46B is an external perspective view.
  • FIG. 47A is a perspective view showing a fuse element having a high melting point fuse element with one cooling member omitted, and FIG. 47B is an external perspective view.
  • FIG. 48 is a perspective view showing a fuse element using a fuse element in which a plurality of blocking portions are arranged in parallel, omitting one cooling member.
  • 49A and 49B are plan views for explaining a manufacturing process of a soluble conductor having a plurality of blocking portions.
  • FIG. 45 is a cross-sectional view showing an example of a fuse element in which a terminal portion is provided on the back surface of the cooling member.
  • 46A is a perspective view showing a fuse element in which three fuse
  • FIG. 49A is a diagram in which both sides of the blocking portion are integrally supported by terminal portions, and FIG. The one side is shown integrally supported by the terminal portion.
  • FIG. 50A is a cross-sectional view showing an example of a fuse element in which a heating element is formed on a cooling member
  • FIG. 50B is a circuit diagram.
  • FIG. 51A is a cross-sectional view showing an example of a fuse element in which a heating element extraction electrode is formed on an insulating layer covering the heating element
  • FIG. 51B is a circuit diagram.
  • FIG. 52A is a cross-sectional view showing an example of a fuse element using a fuse element provided with a plurality of blocking portions
  • FIG. 52B is a circuit diagram.
  • FIG. 53 is a cross-sectional view showing another embodiment of the fuse element to which the present invention is applied.
  • FIG. 54 is a cross-sectional view showing another embodiment of the fuse element to which the present invention is applied.
  • FIG. 55 is a cross-sectional view showing a fuse element using a fuse element having a recess formed on one side.
  • FIG. 56 is a cross-sectional view showing a fuse element using a fuse element having recesses formed on both sides.
  • FIG. 57 is a cross-sectional view showing a fuse element that sandwiches a fuse element in which a recess is directly formed by a pair of cooling members without interposing a metal layer.
  • the fuse element 1 realizes a small and highly rated fuse element, and has a resistance value of 0 while having a small plane size of 3 to 5 mm ⁇ 5 to 10 mm and a height of 2 to 5 mm. .2 to 1m ⁇ , 50 to 150A rating and higher rating.
  • the present invention can be applied to fuse elements having all sizes, resistance values, and current ratings.
  • the fuse element 1 is connected on the current path of the external circuit, and is blown by self-heating (Joule heat) when a current exceeding the rating is energized.
  • the fuse element 2 to be cut off and the cooling member 3 in contact with or close to the fuse element 2 are provided.
  • the fuse element 2 is formed in a rectangular plate shape as shown in FIG. 2A, for example, and both end portions in the energizing direction are terminal portions 5a and 5b connected to connection electrodes of an external circuit (not shown).
  • the fuse element 2 is sandwiched between a pair of upper and lower cooling members 3a and 3b, and a pair of terminal portions 5a and 5b are led out of the cooling members 3a and 3b, and an external circuit is connected via the terminal portions 5a and 5b. It can be connected to the electrode.
  • a specific configuration of the fuse element 2 will be described later in detail.
  • the fuse element 1 includes a pair of upper and lower cooling members 3a and 3b sandwiching the fuse element 2, thereby separating the fuse element 2 from the cooling members 3a and 3b and having a relatively low thermal conductivity. 7 and the high heat conduction portion 8 which is in contact with or close to the cooling members 3a and 3b and has a relatively high thermal conductivity.
  • the cooling member 3 an insulating material having high thermal conductivity such as ceramics can be suitably used, and it can be formed into an arbitrary shape by powder molding or the like.
  • the cooling member 3 preferably has a thermal conductivity of 1 W / (m ⁇ k) or more.
  • cooling member 3 may be formed using a metal material, it is preferable from the viewpoint of short circuit prevention with surrounding components and handling property to cover the surface with insulation.
  • the pair of upper and lower cooling members 3a and 3b form an element casing by being coupled to each other by, for example, an adhesive.
  • the low heat conduction part 7 is provided along the interruption
  • the high heat conduction portion 8 is in a portion other than the blocking portion 9 and is in thermal contact with at least a part of it by coming into contact with or close to the cooling members 3a and 3b. This refers to a site that has been enhanced.
  • the high heat conductive part 8 should just be in thermal contact with the cooling member 3, and may contact via the member provided with thermal conductivity other than contacting the cooling member 3 directly.
  • the fuse element 1 is provided with a low thermal conduction portion 7 along the cutoff portion 9 in the plane of the fuse element 2 and with a high thermal conductivity in a portion other than the cutoff portion 9.
  • the portion 8 when the fuse element 2 generates heat at an overcurrent exceeding the rating, the heat of the high heat conduction portion 8 is actively released to the outside, and the heat generation in portions other than the blocking portion 9 is suppressed. Then, the heat can be concentrated on the low heat conduction part 7 formed along the blocking part 9, and the blocking part 9 can be melted while suppressing the influence of heat on the terminal parts 5a and 5b. Thereby, the fuse element 1 can melt
  • the fuse element 1 has the fuse element 2 formed in the shape of a rectangular plate, and has a reduced resistance by shortening the length in the energizing direction, thereby improving the current rating and connecting to the connection electrode of the external circuit.
  • the fuse element 2 has a larger area of the high heat conduction portion 8 than that of the low heat conduction portion 7. As a result, the fuse element 2 selectively heats and melts the interrupting part 9 and actively releases the heat of the parts other than the interrupting part 9 to suppress the influence of overheating of the terminal parts 5a and 5b, thereby reducing the size. High rating can be achieved.
  • the fuse element 1 is in contact with a portion other than the blocking portion 9 of the fuse element 2 by forming the groove portion 10 at a position corresponding to the blocking portion 9 of the cooling member 3.
  • the blocking portion 9 is superimposed on the groove portion 10 while being close to each other.
  • the low thermal conductivity portion 7 is formed when the blocking portion 9 of the fuse element 2 comes into contact with air having a thermal conductivity lower than that of the cooling member 3.
  • the fuse element 1 In the fuse element 1, the fuse element 2 is sandwiched between the pair of upper and lower cooling members 3, so that both surfaces of the blocking portion 9 are overlapped with the groove portion 10 (FIG. 1B). As a result, the difference in thermal conductivity between the interrupting part 9 and the part other than the interrupting part 9 is increased, so that the fusing part 9 is surely melted and the cooling efficiency of the high heat conducting part 8 is improved. Overheating of the terminal portions 5a and 5b due to heat generation can be suppressed.
  • the fuse element 1 may be arranged so that the interrupting part 9 comes into contact with air by arranging and bonding the cooling members 3a and 3b on both sides of the interrupting part 9.
  • FIG. 5 is a cross-sectional view showing the fuse element 1 in which cooling members 3 a and 3 b made of a metal material are arranged on both sides of the blocking portion 9.
  • the cooling members 3a and 3b made of a metal material are supported by a support member 21 made of an insulating material.
  • the fuse element 1 is formed by sandwiching the fuse element 2 by the support member 21 provided with the cooling members 3a and 3b.
  • a known insulating material such as an engineering plastic, a ceramic substrate, or a glass epoxy substrate can be used.
  • the cooling members 3a and 3b are formed in a region excluding the position where the blocking portion 9 of the fuse element 2 is superposed, for example, on both sides of the blocking portion 9 provided across the width direction of the fuse element 2 as shown in FIG. It is divided and provided.
  • the fuse element 1 the fuse element 2 is sandwiched by the support member 21 via the cooling members 3a and 3b made of a metal material, so that the blocking portion 9 of the fuse element 2 is separated from the cooling members 3a and 3b.
  • the low thermal conductivity portion 7 with low thermal conductivity is formed, and both sides of the blocking portion 9 are in contact with or close to the cooling members 3a and 3b, thereby becoming the high thermal conductivity portion 8 with relatively high thermal conductivity.
  • the metal material layer which comprises the cooling members 3a and 3b separates the interruption
  • a thickness necessary for fusing the blocking portion 9 is provided.
  • the thickness of the metal material layer is preferably 100 ⁇ m or more.
  • a conductive adhesive 15 or solder 96 may be appropriately interposed between the metal material layers constituting the cooling members 3 a and 3 b and the fuse element 2.
  • the fuse element 1 is connected to the cooling members 3a and 3b and the high thermal conductive portion 8 of the fuse element 2 through the adhesive 15 or the solder 96, so that the mutual adhesion is enhanced and the heat is more efficiently cooled. 3a, 3b can be transmitted.
  • the fuse element 1 shown in FIG. 5 can be formed by using a plate-like fuse element 2 and sandwiching the fuse element 2 with a support member 21 on which cooling members 3a and 3b made of a metal material layer are formed. The manufacturing process is facilitated without the need to process the recesses or grooves.
  • the fuse element 1 is rated within the plane of the fuse element 2 by being provided with the low thermal conduction portion 7 along the cutoff portion 9 and by forming the high thermal conduction portion 8 at a portion other than the cutoff portion 9.
  • the fuse element 2 generates heat at an overcurrent exceeding, the heat of the high heat conduction portion 8 is positively released to the outside through the cooling members 3a and 3b made of the metal material layer, and the heat generation in portions other than the blocking portion 9 is generated. While restraining, heat can be concentrated on the low heat conduction part 7 formed along the interruption part 9, so that the interruption part 9 can be melted and the current path of the external circuit can be interrupted.
  • cooling members 3a and 3b made of a metal material are formed on both sides of the blocking portion 9 on both sides of the fuse element 2 as shown in FIG. If the cooling member 3a or the cooling member 3b is formed on both sides of the blocking portion 9 on the surface, a difference in thermal conductivity can be provided between the blocking portion 9 and a portion other than the blocking portion 9.
  • the fuse element has a heat insulating member 4 having a lower thermal conductivity than the cooling members 3a and 3b, and the blocking portion 9 of the fuse element 2 is in contact with or close to the heat insulating member 4.
  • the low heat conductive part 7 whose heat conductivity is relatively lower than the high heat conductive part 8 may be formed.
  • the heat insulating member 4 may be in contact with or close to the blocking portion 9 by being disposed in the groove portion 10 of the cooling members 3a and 3b shown in FIG.
  • the fuse element is formed with a groove portion 10 at a position corresponding to the blocking portion 9 in one cooling member 3 a of the pair of upper and lower cooling members 3 that sandwich the fuse element 2.
  • the groove portion 10 is disposed on and in contact with or close to a portion other than the blocking portion 9, and the other cooling member 3 b is not provided with the groove portion 10 and is in contact with portions other than the blocking portion 9 and the blocking portion 9 of the fuse element 2. Or you may make it adjoin.
  • the fuse element 20 shown in FIG. 6 a difference in thermal conductivity is provided between the blocking portion 9 and a portion other than the blocking portion 9, and the low thermal conductive portion 7 is provided along the blocking portion 9 in the plane of the fuse element 2.
  • the high heat conduction portion 8 is formed in a portion other than the blocking portion 9.
  • the cooling member 3 may be superimposed on one surface side of the fuse element 2 and the other surface side may be covered with the cover member 13.
  • the cooling member 3 in which the groove portion 10 is formed on the lower surface of the fuse element 2 is in contact with or close to the fuse element 30, and the upper surface is covered with the cover member 13.
  • the groove portion 10 is overlapped with the blocking portion 9 of the fuse element 2, and is in contact with or close to a portion other than the blocking portion 9.
  • the fuse element 30 shown in FIG. 7 there is a difference in thermal conductivity between the interrupting part 9 and a part other than the interrupting part 9, and the low heat conducting part 7 is provided along the interrupting part 9 in the plane of the fuse element 2.
  • the high heat conduction portion 8 is formed in a portion other than the blocking portion 9.
  • the fuse element 30 transmits the heat of the fuse element 2 to the circuit board side by arranging the cooling member 3 on the mounting surface side where the terminal portions 5a and 5b are led out and mounted on the circuit board on which the external circuit is formed. And can be cooled more efficiently.
  • the cooling member 3 may be disposed on the side opposite to the mounting surface on the circuit board, and the cover member 13 may be disposed on the mounting surface side where the terminal portions 5a and 5b are led out.
  • the cover member 13 since the terminal portions 5a and 5b are in contact with the side surface of the cover member 13, the transfer of heat to the terminal portions 5a and 5b via the cooling member 3 is suppressed, and the solder for surface mounting is dissolved. Risk can be further reduced.
  • the fuse element 1 is provided with a fitting recess 12 for fitting the fuse element 2 on the surface of the cooling member 3 that sandwiches the fuse element 2.
  • the fitting recess 12 has a depth that makes contact with or close to both surfaces of the fuse element 2 when the pair of upper and lower cooling members 3a and 3b sandwich the fuse element 2, and allows the terminal portions 5a and 5b to be led out to the outside. Both ends are open.
  • the fuse element 1 is sealed except for the openings from which the terminal portions 5a and 5b are led, as shown in FIGS.
  • Each fitting recess 12 of the pair of cooling members 3 contacts or approaches the surface of the fuse element 2.
  • the fuse element 1 does not need to be provided with the fitting recess 12 in at least one of the cooling members 3.
  • the fuse element 1 when the fuse element 1 is sandwiched between the pair of cooling members 3, a gap is formed by the fuse element 2, and the gas vaporized by the element material generated when the fuse element 2 is melted can be discharged to the outside. Therefore, the fuse element 1 can prevent the destruction of the casing due to the increase in internal pressure due to the generation of gas.
  • the groove portion 10 is continuously formed across the width direction of the blocking portion 9 orthogonal to the energization direction of the fuse element 2.
  • the fuse element 1 has a width W 2 that is longer than the width W 1 of the fuse element 2, so that the low heat conducting portion 7 extends over the entire width of the blocking portion 9 of the fuse element 2. Is formed. Therefore, the fuse element 1 can be blown by the interruption portion 9 being heated over the entire width.
  • the fuse element 1 has a width W 2 of the groove portion 10 smaller than the width W 1 of the fuse element 2, and a low heat conduction portion 7 is formed over a part in the length direction of the blocking portion 9. Also good.
  • the fuse element 1 is intermittently formed in the length direction of the blocking portion 9 by intermittently forming the plurality of groove portions 10 in the width direction of the fuse element 2.
  • the low heat conduction part 7 may be formed.
  • the length L 1 of the groove portion 10 formed in the cooling member 3 in the energizing direction of the fuse element 2 is as shown in FIG. 2 when the rectangular plate-like fuse element 2 is used, as shown in FIG. 9 is preferably equal to or less than the minimum width, and more preferably equal to or less than 1 ⁇ 2 of the minimum width in the blocking portion 9 of the fuse element 2.
  • the minimum width in the interruption portion 9 is the minimum width in the width direction orthogonal to the conduction direction in the interruption portion 9 of the fuse element 2 on the surface of the rectangular plate-like fuse element.
  • the interruption portion 9 is arcuate, tapered, stepped If the width is smaller than the portion other than the blocking portion 9, the minimum width is used, and the blocking portion 9 is a portion other than the blocking portion 9 as shown in FIG. Is the width W 1 of the fuse element 2.
  • Fuse element 1 minimum width the length L 1 of the groove 10 in the blocking section 9 below and by narrowing the half or less of the minimum width of the cut-off portion 9, suppressing the occurrence of arc discharge at the time of fusing, insulating Resistance can be improved.
  • the fuse element may be a rod-shaped fuse element.
  • the fuse element 40 shown in FIGS. 11A and 11B includes a cylindrical fuse element 41, a pair of terminal pieces 42 a and 42 b provided at both ends of the fuse element 41, and upper and lower sandwiching the fuse element 41. It has a pair of cooling members 3a and 3b.
  • the fuse element 40 is flush with the terminal pieces 42a and 42b by fitting the cooling members 3a and 3b between the terminal pieces 42a and 42b, and the element housing is formed by the cooling members 3a and 3b and the terminal pieces 42a and 42b.
  • the body is composed.
  • the fuse element 40 has a pair of upper and lower cooling members 3a and 3b formed with a groove portion 10 at a position corresponding to the blocking portion 9 of the fuse element 41, and sandwiching the fuse element 41, thereby providing a cooling member in the fuse element 41.
  • a low thermal conductivity portion 7 that is separated from 3a and 3b and has relatively low thermal conductivity, and a high thermal conductivity portion 8 that is in contact with or close to the cooling members 3a and 3b and relatively high thermal conductivity are formed.
  • the length L 1 in the energizing direction of the fuse element 41 of the groove portion 10 formed in the cooling member 3 is preferably not more than twice the minimum diameter of the blocking portion 9 of the fuse element 2.
  • the minimum diameter in the interrupting part 9 is the minimum diameter in the width direction perpendicular to the conduction direction in the interrupting part 9 of the fuse element 41.
  • a conical shape in which the interrupting part 9 gradually decreases in diameter toward the center or a small-diameter cylinder is used. When the shape is continuous through a step or the like and is formed with a smaller diameter than the portion other than the blocking portion 9, the minimum diameter is used. As shown in FIG. When it is formed with the same diameter as the part other than 9, it means the diameter of the fuse element 41.
  • the fuse element 40 can suppress the occurrence of arc discharge at the time of fusing and improve the insulation resistance by narrowing the length L 1 of the groove portion 10 to be not more than twice the minimum diameter of the fuse element 41 in the breaking portion 9. it can.
  • the length L 1 over the energizing direction of the fuse elements 2 and 41 of the groove part 10 formed in the cooling member 3 is 0.5 mm or more.
  • the fuse elements 1 and 40 are provided with the low heat conduction part 7 having a length of 0.5 mm or more, thereby forming a temperature difference with the high heat conduction part 8 at the time of overcurrent, and selectively cutting off the interruption part 9. it can.
  • the length L 1 in the energizing direction of the fuse elements 2 and 41 of the groove portion 10 formed in the cooling member 3 is 5 mm or less.
  • the fuse elements 1 and 40 increase the area of the blocking portion 9, so that the time required for fusing is increased and the fast fusing property is inferior, and arc discharge As a result, the scattering amount of the fuse elements 2 and 41 increases, and there is a possibility that the insulation resistance is lowered by the molten metal adhering to the periphery.
  • the minimum gap between the high heat conduction portion 8 of the adjacent fuse elements 2 and 41 and the cooling members 3a and 3b is 100 ⁇ m or less.
  • the fuse elements 2 and 41 are sandwiched between the cooling members 3 a and 3 b, so that the portions that are in contact with or close to the cooling members 3 a and 3 b serve as the high heat conduction unit 8.
  • the minimum gap between the high heat conducting portion 8 of the fuse elements 2 and 41 and the cooling members 3a and 3b is set to 100 ⁇ m or less, so that the portions other than the blocking portion 9 of the fuse elements 2 and 41 and the cooling member 3 are connected.
  • the heat generated at the time of overcurrent exceeding the rating can be transmitted to the outside through the cooling member 3, and only the blocking portion 9 can be selectively blown.
  • the minimum gap between the high heat conduction part 8 of the fuse elements 2 and 41 and the cooling members 3a and 3b exceeds 100 ⁇ m, the thermal conductivity of the part falls, and other than the interruption part 9 at the time of overcurrent exceeding the rating There is a risk that the unexpected part of the material melts at a high temperature.
  • the fuse element may connect a plurality of fuse elements 2 in parallel as a fuse element.
  • the fuse element 50 includes, for example, three fuse elements 2A, 2B, and 2C arranged in parallel on the cooling member 3a.
  • the fuse elements 2A to 2C are formed in a rectangular plate shape, and terminal portions 5a and 5b are bent at both ends.
  • the fuse elements 2A to 2C are connected in parallel by connecting the terminal portions 5a and 5b to the common connection electrode of the external circuit. Accordingly, the fuse element 50 has a current rating equivalent to that of the above-described fuse element 1 using the single fuse element 2.
  • the fuse elements 2A to 2C are arranged in parallel with a distance so as not to come into contact with the adjacent fuse element at the time of fusing.
  • the fuse elements 2A to 2C have a surface such that the interrupting portion 9 that interrupts the current path between the terminal portions 5a and 5b overlaps with the groove portion 10 formed in the cooling member 3a.
  • the low heat conduction part 7 is provided along the interruption
  • FIG. 12 (A) When the fuse elements 2A to 2C generate heat at the time of overcurrent exceeding the rating, the heat of the high heat conducting portion 8 is actively released to the outside through the cooling member 3, and the heat generation in portions other than the blocking portion 9 is suppressed. Then, the heat can be concentrated on the low heat conduction portion 7 formed along the blocking portion 9, so that the blocking portion 9 can be melted.
  • the fuse elements 2A to 2C are blown sequentially because a large amount of current flows from the one having a low resistance value.
  • the fuse element 50 cuts off the current path of the external circuit by melting all the fuse elements 2A to 2C.
  • the fuse element 50 even when an electric current exceeding the rating is applied to the fuse elements 2A to 2C and an arc discharge is generated when the fuse element is blown, the melted fuse element is scattered over a wide range, A new current path can be formed or scattered metal can be prevented from adhering to the terminals and surrounding electronic components.
  • the fuse element 50 since the fuse element 50 has the fuse elements 2A to 2C arranged in parallel, when a current exceeding the rating is applied, a large amount of current flows through the fuse element 2 having a low resistance value, and the fuse element 50 is sequentially melted by self-heating. Then, arc discharge occurs only when the last remaining fuse element 2 is melted. Therefore, according to the fuse element 50, even when an arc discharge occurs when the last remaining fuse element 2 is blown, the fuse element 50 becomes a small scale according to the volume of the fuse element 2 and explodes the molten metal. In addition, the insulation after fusing can be greatly improved. Further, since the fuse element 50 is blown for each of the plurality of fuse elements 2A to 2C, less heat energy is required for fusing each fuse element, and can be cut off in a short time.
  • the fuse element 50 may control the fusing order by making the width of the blocking portion 9 of one fuse element of the plurality of fuse elements 2 narrower than the width of the blocking portion 9 of another fuse element.
  • the fuse element 50 preferably includes three or more fuse elements 2 arranged in parallel, and the width of at least one fuse element 2 other than both sides in the parallel direction is made narrower than the width of other fuse elements.
  • the width of a part or all of the middle fuse element 2B of the fuse elements 2A to 2C is made narrower than the widths of the other fuse elements 2A and 2C, and a difference in cross-sectional area is provided.
  • the resistance of the fuse element 2B is relatively increased.
  • a current exceeding the rating is supplied to the fuse element 50, a large amount of current is first supplied from the relatively low resistance fuse elements 2A and 2C and blown. Since the fusing of these fuse elements 2A and 2C does not involve arc discharge due to self-heating, there is no explosive scattering of molten metal. Thereafter, the current concentrates on the remaining high resistance fuse element 2B, and finally blows with arc discharge.
  • the fuse element 50 can sequentially blow the fuse elements 2A to 2C.
  • arc discharge occurs when the fuse element 2B having a small cross-sectional area is blown out.
  • the fuse element 2A to 2C becomes a small scale depending on the volume of the fuse element 2B, thereby preventing explosive scattering of the molten metal. it can.
  • the fuse element 50 is formed by fusing the fuse element 2B provided on the inner side last, so that even if arc discharge occurs, the outer fuse element 2A that has melted the molten metal of the fuse element 2B first. , 2C. Therefore, scattering of the molten metal of the fuse element 2B can be suppressed, and a short circuit due to the molten metal can be prevented.
  • the fuse element 50 may include a high melting point fuse element 51 having a melting temperature higher than that of the fuse element 2, and the plurality of fuse elements 2 and the high melting point fuse element 51 may be arranged at a predetermined interval.
  • the fuse element 50 includes three elements of the fuse elements 2 ⁇ / b> A and 2 ⁇ / b> C and the high melting point fuse element 51 arranged in parallel on the cooling member 3.
  • the high melting point fuse element 51 can be formed using, for example, a high melting point metal such as Ag, Cu, or an alloy containing these as a main component.
  • the high melting point fuse element 51 may be composed of a low melting point metal and a high melting point metal as will be described later.
  • the high melting point fuse element 51 is formed in a substantially rectangular plate shape like the fuse element 2, and terminal portions 52 a and 52 b are bent at both ends, and these terminal portions 52 a and 52 b are each terminal portion of the fuse element 2.
  • the fuse element 2 By being connected to the common connection electrode of the external circuit together with 5a and 5b, the fuse element 2 is connected in parallel.
  • the fuse element 50 has a current rating equal to or higher than that of the above-described fuse element 1 using one fuse element 2.
  • the fuse elements 2A and 2C and the high melting point fuse element 51 are arranged in parallel at a distance so as not to contact the adjacent fuse element when blown.
  • the high melting point fuse element 51 includes a groove portion 10 formed in the cooling member 3 and a blocking portion 9 that blocks a current path between the terminal portions 52 a and 52 b, as in the case of the fuse elements 2 ⁇ / b> A and 2 ⁇ / b> C.
  • the low heat conduction part 7 is provided along the blocking part 9 in the plane, and the high heat conduction part 8 is formed in a part other than the blocking part 9.
  • the fuse element 50 shown in FIG. 13 when the overcurrent exceeds the rating, the fuse elements 2A and 2C having a low melting point are blown first, and the high melting point fuse element 51 having a high melting point is blown last. Therefore, the high melting point fuse element 51 can be shut off in a short time according to its volume, and even when arc discharge occurs when the last remaining high melting point fuse element 51 is melted, the high melting point fuse element 51 It becomes a small scale according to the volume of 51, can prevent the explosive scattering of the molten metal, and can greatly improve the insulation after fusing.
  • the fuse element 50 blocks the current path of the external circuit when all the fuse elements 2A and 2C and the high melting point fuse element 51 are melted.
  • the high melting point fuse element 51 is disposed at a place other than both sides in the parallel direction in which a plurality of high melting point fuse elements 51 are disposed in parallel with the fuse element 2.
  • the high melting point fuse element 51 is preferably disposed between the two fuse elements 2A and 2C as shown in FIG.
  • the molten metal of the refractory fuse element 51 is melted by the outer fuse elements 2A and 2C previously blown. Therefore, it is possible to prevent the molten metal from being scattered by the high melting point fuse element 51 and to prevent a short circuit due to the molten metal.
  • the cooling member 3 may be provided with the metal layer 14 on a part or all of the contact surface with the fuse elements 2, 51.
  • the fuse element 1 will be described as an example with reference to FIG.
  • the metal layer 14 can be formed, for example, by applying a metal paste made of solder, Ag, Cu, or an alloy using these.
  • the metal layer 14 may be provided on both the upper and lower pair of cooling members 3 or may be provided only on one of them. Further, the metal layer 14 may be provided on the back surface side in addition to the surface of the cooling member 3 that sandwiches the fuse element 2.
  • Each fuse element 1 described above is provided with a connection electrode connected to a connection electrode of the external circuit on the back surface of the cooling member 3 mounted on the circuit board of the external circuit, and the fuse element 2 is provided with terminal portions 5a and 5b. It may not be provided.
  • the fuse element 1 is electrically connected to the metal layer 14 and the connection electrode formed on the back surface by a through hole, castellation or the like.
  • the fuse elements 1, 20, 30, 40 and 50 described above may connect the fuse elements 2 and 51 to the cooling member 3 with the adhesive 15.
  • the fuse element 1 will be described as an example with reference to FIG.
  • the adhesive 15 is provided at a portion other than the cooling member 3 and the blocking portion 9 of the fuse element 2.
  • the fuse element 1 can improve the adhesion between the cooling member 3 and the high thermal conductive portion 8 of the fuse element 2 through the adhesive 15, and can more efficiently transfer heat to the cooling member 3.
  • any known adhesive can be used as the adhesive 15, but it is preferable to have high thermal conductivity in order to promote cooling of the fuse element 2 (for example, KJR-9086, manufactured by Shin-Etsu Chemical Co., Ltd.). SX720: manufactured by Cemedine Corporation, SX1010: manufactured by Cemedine Corporation).
  • the adhesive 15 may be a conductive adhesive containing conductive particles in a binder resin. Even when a conductive adhesive is used as the adhesive 15, the adhesion between the cooling member 3 and the fuse element 2 is improved, and the heat of the high heat conduction portion 8 is efficiently transmitted to the cooling member 3 through the conductive particles. be able to. Further, instead of the adhesive 15, it may be connected with solder.
  • the fuse element 2 described above is a low melting point metal such as solder or Pb-free solder whose main component is Sn, or a laminated body of a low melting point metal and a high melting point metal.
  • the fuse element 2 is a laminated structure including an inner layer and an outer layer, and has a low melting point metal layer 2a as an inner layer and a refractory metal layer 2b as an outer layer laminated on the low melting point metal layer 2a (FIG. 1B )reference).
  • the low melting point metal layer 2a is preferably a metal mainly composed of Sn, and is a material generally called “Pb-free solder”.
  • the melting point of the low melting point metal layer 2a is not necessarily higher than the reflow temperature, and may be melted at about 200 ° C.
  • the high melting point metal layer 2b is a metal layer laminated on the surface of the low melting point metal layer 2a.
  • the high melting point metal layer 2b is made of Ag, Cu, or a metal mainly containing any of these, and the fuse elements 1, 20, Even when 30, 40, 50 is mounted on an external circuit board by a reflow furnace, it has a high melting point that does not melt.
  • the fuse element 2 2 does not lead to fusing. Therefore, the fuse element 1 can be efficiently mounted by reflow.
  • the fuse element 2 is not melted by self-heating while a predetermined rated current flows.
  • a current having a value higher than the rating flows, melting starts from the melting point of the low melting point metal layer 2a by self-heating, and the current path between the terminal portions 5a and 5b can be quickly cut off.
  • the low melting point metal layer 2a is made of Sn—Bi alloy or In—Sn alloy, the fuse element 2 starts to melt from a low temperature of about 140 ° C. or about 120 ° C.
  • the fuse element 2 uses, for example, an alloy containing 40% or more of Sn as a low melting point metal, and the melted low melting point metal layer 2a corrodes the high melting point metal layer 2b, whereby the high melting point metal layer 2b melts at a temperature lower than the melting temperature. Therefore, the fuse element 2 can be blown out in a short time using the erosion action of the high melting point metal layer 2b by the low melting point metal layer 2a.
  • the fuse element 2 is configured by laminating the high melting point metal layer 2b on the low melting point metal layer 2a serving as the inner layer, the fusing temperature is significantly reduced compared to a conventional chip fuse made of a high melting point metal. be able to. Therefore, the fuse element 2 is formed wider than the refractory metal element, and the energization direction is shortened to reduce the size while greatly improving the current rating, and to the connection portion with the circuit board. The influence of heat can be suppressed. In addition, it can be made smaller and thinner than conventional chip fuses having the same current rating, and is excellent in quick fusing.
  • the fuse element 2 can improve resistance to a surge (pulse resistance) in which an abnormally high voltage is instantaneously applied to the electrical system in which the fuse element 1 is incorporated. That is, the fuse element 2 must not be blown until, for example, a current of 100 A flows for several milliseconds.
  • the fuse element 2 since a large current flowing in a very short time flows in the surface layer of the conductor (skin effect), the fuse element 2 is provided with a refractory metal layer 2b such as Ag plating having a low resistance value as an outer layer. It is easy to flow the current applied by the surge, and it is possible to prevent fusing due to self-heating. Therefore, the fuse element 2 can greatly improve the resistance to surge as compared with a fuse made of a conventional solder alloy.
  • the fuse element 2 can be manufactured by using a high melting point metal 2b on the surface of the low melting point metal layer 2a by using a film forming technique such as an electrolytic plating method.
  • the fuse element 2 can be efficiently manufactured by performing Ag plating on the surface of solder foil or thread solder.
  • the high melting point fuse element 51 can be manufactured in the same manner as the fuse element 2.
  • the refractory fuse element 51 is made, for example, by making the thickness of the refractory metal layer 2b thicker than that of the fuse element 2, or by using a refractory metal having a melting point higher than that of the refractory metal used for the fuse element 2.
  • the melting point can be made higher than that of the fuse element 2.
  • the fuse element 2 is preferably formed such that the volume of the low melting point metal layer 2a is larger than the volume of the high melting point metal layer 2b.
  • the fuse element 2 melts the high melting point metal by melting the low melting point metal by self-heating, and can thereby be melted and blown quickly. Therefore, the fuse element 2 promotes this corrosion action by forming the volume of the low-melting-point metal layer 2a larger than the volume of the high-melting-point metal layer 2b, and promptly shuts off the terminal portions 5a and 5b. Can do.
  • the fuse element 2 may be provided with a deformation restricting portion that suppresses the flow of the molten low melting point metal and restricts deformation.
  • a deformation restricting portion that suppresses the flow of the molten low melting point metal and restricts deformation.
  • the resistance value decreases at the location where the low melting point metal 101 expands due to the aggregation of the low melting point metal 101, and conversely the resistance value increases at the location where the low melting point metal 101 flows out. Variation occurs.
  • the predetermined fusing characteristics cannot be maintained, such as not fusing at a predetermined temperature and current, or taking a long time for fusing, and conversely fusing at a temperature lower than a predetermined temperature or current value.
  • the fuse element 2 can suppress the deformation of the fuse element 2 within a certain range that suppresses the variation in the fusing characteristic by providing the deformation restricting portion, and can maintain the predetermined fusing characteristic. .
  • the deformation restricting portion 6 has at least a part of the side surface 11a of the one or more holes 11 provided in the low melting point metal layer 2a continuous with the high melting point metal layer 2b.
  • the second refractory metal layer 16 is covered.
  • the hole 11 can be formed, for example, by piercing a pointed object such as a needle into the low melting point metal layer 2a, or by pressing the low melting point metal layer 2a using a die.
  • the holes 11 are uniformly formed over the entire surface of the low melting point metal layer 2a in a predetermined pattern, for example, a tetragonal lattice shape or a hexagonal lattice shape.
  • the material constituting the second refractory metal layer 16 has a high melting point that does not melt depending on the reflow temperature, like the material constituting the refractory metal layer 2b.
  • the second refractory metal layer 16 is preferably made of the same material as that of the refractory metal layer 2b and is formed together in the step of forming the refractory metal layer 2b in terms of manufacturing efficiency.
  • such a fuse element 2 is sandwiched between a pair of cooling members 3a and 3b, and then the fuse element 1 is mounted on an external circuit board of various electronic devices and reflow mounted. .
  • the fuse element 2 is formed by laminating the low melting point metal layer 2a as the outer layer with the high melting point metal layer 2b that does not melt even at the reflow temperature and by providing the deformation restricting portion 6, thereby reflowing the fuse element 1 to the external circuit board.
  • the deformation restricting portion 6 can suppress the deformation of the fuse element 2 within a certain range that suppresses the variation in fusing characteristics. Therefore, the fuse element 1 can be reflow mounted even when the fuse element 2 has a large area, and the mounting efficiency can be improved. Further, the fuse element 2 can achieve an improvement in rating in the fuse element 1.
  • the fuse element 2 has a hole 11 in the low melting point metal layer 2a and a deformation restricting portion 6 in which the side surface 11a of the hole 11 is covered with the second high melting point metal layer 16 so that a reflow furnace or the like is provided. Even when exposed to a high heat environment above the melting point of the low melting point metal layer 2a by an external heat source for a short time, the second high melting point metal layer 16 covering the side surface 11a of the hole 11 causes the molten low melting point metal to flow.
  • the refractory metal layer 2b constituting the outer layer is supported while being suppressed. Therefore, the fuse element 2 can prevent the low melting point metal melted by tension from agglomerating and expanding, or the melted low melting point metal flowing out and becoming thin, and locally generating crushing and swelling. .
  • the fuse element 2 prevents the fluctuation of the resistance value due to local deformation such as crushing and swelling at the temperature at the time of reflow mounting, and maintains the fusing characteristic of fusing at a predetermined temperature and current for a predetermined time. be able to.
  • the fuse element 2 is also blown when the fuse element 1 is repeatedly exposed to the reflow temperature, such as after the reflow mounting of the fuse element 1 to the external circuit board and then the external circuit board is further reflow mounted on another circuit board. Characteristics can be maintained and mounting efficiency can be improved.
  • the fuse element 2 when the fuse element 2 is cut out from a large element sheet, the low melting point metal layer 2a is exposed from the side surface of the fuse element 2, and the side surface is connected to the external circuit board. It is in contact with the connection electrode provided on the via the solder for connection. Also in this case, since the fuse element 2 suppresses the flow of the low melting point metal melted by the deformation restricting portion 6, the volume of the low melting point metal is increased by sucking the molten solder for connection from the side surface, and the fuse element 2 is localized. The resistance value does not decrease.
  • the fuse element 2 is fitted to the side surface of the cooling member 3a, and both ends are bent to the back side of the cooling member 3a, and the terminal portions 5a and 5b are cooled. You may form in the back surface side of 3a.
  • the fuse element 2 is fitted to the side surface of the cooling member 3a, and both ends are bent to the outside of the cooling member 3a, and the terminal portions 5a and 5b are connected to the cooling member 3a. You may form in the outer side.
  • the fuse element 2 may be bent so that the terminal portions 5a and 5b are flush with the back surface of the cooling member 3a, or protrude from the back surface of the cooling member 3a. You may bend as you do.
  • the fuse element 2 is formed of the low melting point metal constituting the inner layer by forming the terminal portions 5a and 5b at positions where the terminal portions 5a and 5b are further bent from the side surface to the back surface side or the outside. Outflow and inflow of connecting solder connecting the terminal portions 5a and 5b can be suppressed, and fluctuations in fusing characteristics due to local crushing and expansion can be prevented.
  • the hole 11 may be formed as a through hole penetrating the low melting point metal layer 2a in the thickness direction as shown in FIG. 17B, or as shown in FIG. You may form as a through-hole.
  • the hole 11 is formed as a through hole, the second refractory metal layer 16 covering the side surface 11a of the hole 11 is continuous with the refractory metal layer 2b laminated on the front and back surfaces of the low melting point metal layer 2a.
  • the hole 11 is preferably covered with the second refractory metal layer 16 up to the bottom surface 11b as shown in FIG.
  • the hole 11 is formed as a non-through hole, and even when the low melting point metal flows due to reflow heating, the flow is suppressed by the second high melting point metal layer 16 covering the side surface 11 a of the hole 11. Since the refractory metal layer 2b constituting the outer layer is supported, as shown in FIG. 20B, the thickness variation of the fuse element 2 is slight and the fusing characteristics do not vary.
  • the hole 11 may be filled with the second refractory metal layer 16 as shown in FIGS.
  • the fuse element 2 improves the strength of the deformation restricting portion 6 that supports the refractory metal layer 2 b constituting the outer layer and deforms the fuse element 2. While being able to suppress more, a rating can be improved by low resistance.
  • the second refractory metal layer 16 can be formed at the same time when the refractory metal layer 2b is formed, for example, by electroplating the low melting metal layer 2a having the holes 11 formed therein.
  • the hole 11 can be filled with the second refractory metal layer 16 by adjusting the hole diameter and plating conditions.
  • the hole 11 may be formed in a tapered shape as shown in FIG.
  • the hole 11 can be formed in a tapered shape according to the shape of the sharpened body, for example, by piercing and opening a sharpened object such as a needle into the low melting point metal layer 2a.
  • the hole 11 may be formed in a rectangular cross section as shown in FIGS.
  • the fuse element 2 can open the hole 11 having a rectangular section by, for example, pressing the low melting point metal layer 2a using a die corresponding to the hole 11 having a rectangular section.
  • the deformation restricting portion 6 only needs to be covered with the second refractory metal layer 16 that is continuous with the refractory metal layer 2b at least part of the side surface 11a of the hole 11, and as shown in FIG. It may be covered with the second refractory metal layer 16 up to the upper side of 11a.
  • the deformation restricting portion 6 opens or penetrates the hole 11 by forming a laminated body of the low-melting-point metal layer 2a and the high-melting-point metal layer 2b and then piercing the sharpened body from above the high-melting-point metal layer 2b.
  • the second refractory metal layer 16 may be formed by pressing a part of the refractory metal layer 2 b into the side surface 11 a of the hole 11.
  • the second refractory metal layer 16 continuous with the refractory metal layer 2b is laminated on a part of the side surface 11a of the hole 11 so as to be laminated on the side surface 11a of the hole 11.
  • the flow of the low-melting-point metal melted by the second high-melting-point metal layer 16 is suppressed, and the high-melting-point metal layer 2b on the opening end side is supported, and the occurrence of local crushing and expansion of the fuse element 2 is suppressed. can do.
  • the deformation restricting portion 6 is formed by forming the hole 11 as a non-through hole and facing one surface and the other surface of the low melting point metal layer 2a. Also good. Further, as shown in FIG. 24B, the deformation restricting portion is formed so that the hole 11 is formed as a non-through hole and is not opposed to one surface and the other surface of the low melting point metal layer 2a. Also good. By forming the non-penetrating holes 11 on both surfaces of the low melting point metal layer 2a so as to face each other or not to face each other, the low melting point metal melted by the second refractory metal layer 16 covering the side surface 11a of each hole 11 can be used.
  • the fuse element 2 can prevent the low melting point metal melted by tension from agglomerating and expanding, or the melted low melting point metal flowing out and becoming thin, and locally generating crushing and swelling. .
  • the deformation restricting portion 6 preferably has a hole diameter through which a plating solution can flow in order to cover the second refractory metal layer 16 by electrolytic plating on the side surface 11a of the hole 11 in terms of manufacturing efficiency.
  • the minimum diameter is 50 ⁇ m or more, more preferably 70 to 80 ⁇ m.
  • the maximum diameter of the hole 11 can be set as appropriate depending on the plating limit of the second refractory metal layer 16, the thickness of the fuse element 2, and the like, but the initial resistance tends to increase as the hole diameter increases. There is.
  • the depth of the hole 11 is 50% or more of the thickness of the low melting point metal layer 2a. If the depth of the hole 11 is shallower than this, the flow of the molten low melting point metal cannot be suppressed, and the fusing characteristics may be changed with the deformation of the fuse element 2.
  • the holes 11 formed in the low melting point metal layer 2a are formed with a predetermined density, for example, one or more per 15 ⁇ 15 mm.
  • transformation control part 6 is formed in the interruption
  • the deformation restricting portion 6 is provided with the holes 11 at both ends where the terminal portions 5a and 5b of the fuse element 2 are provided.
  • the fuse element 2 the low melting point metal layer 2a in which the terminal portions 5a and 5b constitute the inner layer is exposed, and is connected to a connection electrode of an external circuit via a connection solder or the like.
  • the fuse element 2 since the fuse element 2 is not sandwiched between the cooling members 3a and 3b at both ends, the fuse element 2 has low rigidity and is likely to be deformed. Therefore, the fuse element 2 is provided with the holes 11 whose side surfaces 11a are covered with the second refractory metal layer 16 on both end sides, whereby the rigidity can be increased and deformation can be effectively prevented.
  • the fuse element 2 can be manufactured by forming a hole 11 constituting the deformation restricting portion 6 in the low melting point metal layer 2a and then depositing a high melting point metal on the low melting point metal layer 2a using a plating technique.
  • the fuse element 2 is manufactured by, for example, producing an element film by opening a predetermined hole 11 in a long solder foil and then applying Ag plating to the surface, and cutting it according to the size at the time of use. It can be manufactured well and can be used easily.
  • the fuse element 2 can be deformed in the fuse element 2 in which the low-melting-point metal layer 2a and the high-melting-point metal layer 2b are laminated by using a thin film forming technique such as vapor deposition or other known lamination technique. 6 can be formed.
  • the deformation restricting portion 6 opens or penetrates the hole 11 by forming a laminated body of the low-melting-point metal layer 2a and the high-melting-point metal layer 2b and then piercing the sharpened body from above the high-melting-point metal layer 2b.
  • the second refractory metal layer 16 may be formed by pressing a part of the refractory metal layer 2 b having viscosity or viscoelasticity into the side surface 11 a of the hole 11.
  • the fuse element 2 may be formed with an antioxidant film (not shown) on the surface of the refractory metal layer 2b constituting the outer layer.
  • the fuse element 2 can prevent the oxidation of Cu even when, for example, a Cu plating layer is formed as the refractory metal layer 2b by covering the outer refractory metal layer 2b with an antioxidant film. . Therefore, the fuse element 2 can prevent a situation where the fusing time is prolonged due to oxidation of Cu, and can be blown in a short time.
  • the fuse element 2 can be made of an inexpensive but easily oxidized metal such as Cu as the refractory metal layer 2b, and can be formed without using an expensive material such as Ag.
  • the high melting point metal antioxidant film can be made of the same material as the low melting point metal layer 2a, for example, Pb-free solder containing Sn as a main component.
  • the antioxidant film can be formed by performing tin plating on the surface of the refractory metal layer 2b.
  • the antioxidant film can be formed by Au plating or preflux.
  • the fuse element 2 may be cut out to a desired size from a large element sheet. That is, a large-sized element sheet made of a laminate of the low melting point metal layer 2a and the high melting point metal layer 2b in which the deformation restricting portion 6 is uniformly formed over the entire surface is formed, and a plurality of fuse elements 2 of an arbitrary size are cut out. May be formed. In the fuse element 2 cut out from the element sheet, the deformation restricting portion 6 is uniformly formed over the entire surface. Therefore, even if the low melting point metal layer 2a is exposed from the cut surface, the fuse element 2 is melted by the deformation restricting portion 6.
  • the flow of the melting point metal is suppressed, the inflow of the solder for connection from the cut surface and the outflow of the low melting point metal can be suppressed, and the variation of the resistance value and the fluctuation of the fusing characteristic due to the thickness variation can be prevented. .
  • the size is defined by the width of the element film, and it is necessary to manufacture an element film for each size.
  • the fuse element 2 can be cut out in a desired size, and the degree of freedom in size increases.
  • the refractory metal layer 2b is thickly plated on the side edges extending in the longitudinal direction where the electric field is concentrated, and it is difficult to obtain a fuse element 2 having a uniform thickness. It was. Therefore, on the fuse element, a clearance is generated between the fuse element 2 and the cooling member 3 due to the thick portion of the fuse element 2, and the adhesive 15 or the like that fills the clearance in order to prevent a decrease in thermal conductivity in the high heat conduction portion 8 or the like. Need to be provided.
  • the fuse element 2 can be cut out while avoiding the thick part, and the fuse element 2 having a uniform thickness can be obtained over the entire surface. Therefore, the fuse element 2 cut out from the element sheet can be improved in adhesion with the cooling member 3 simply by being disposed on the cooling member 3.
  • the fuse element 2 is formed by blending the deformation restricting portion 6 with the first high melting point particle 17 having a melting point higher than that of the low melting point metal layer 2 a in the low melting point metal layer 2 a.
  • the first high melting point particle 17 is made of a material having a high melting point that does not melt even at the reflow temperature.
  • particles made of a metal such as Cu, Ag, Ni or an alloy containing these, glass particles, ceramic particles, etc. are used. Can do.
  • the first high melting point particle 17 may have any shape such as a spherical shape or a scale shape.
  • the first high-melting particle 17 is familiar and has excellent dispersibility because it has a higher specific gravity than glass or ceramic when a metal, an alloy, or the like is used.
  • the deformation restricting portion 6 includes the low melting point metal layer 2a in which the first high melting point particles 17 are dispersed and arranged in a single layer by, for example, molding the first high melting point particles 17 into the low melting point metal material and then molding the film into a film shape. Then, the refractory metal layer 2b is laminated. Further, the deformation restricting portion 6 may cause the first refractory particles 17 to adhere to the refractory metal layer 2b by pressing the fuse element 2 in the thickness direction after the refractory metal layer 2b is laminated.
  • the deformation restricting portion 6 has the low melting point metal 17 by the first high melting point particles 17.
  • the refractory metal layer 2b can be supported and the local collapse and expansion of the fuse element 2 can be suppressed.
  • transformation control part 6 may mix
  • the fuse element 2 is formed by deforming the deformation restricting portion 6 by pressing the second high melting point particles 18 having a melting point higher than that of the low melting point metal layer 2 a into the low melting point metal layer 2 a. May be.
  • the second high melting point particle 18 the same material as the first high melting point particle 17 described above can be used.
  • the deformation restricting portion 6 is formed by embedding the second high melting point particles 18 into the low melting point metal layer 2a and then laminating the high melting point metal layer 2b. At this time, it is preferable that the second high melting point particle 18 penetrates the low melting point metal layer 2a in the thickness direction. Thereby, even when the high melting point metal layer 2b is supported by the second high melting point particles 18 and the low melting point metal is melted by the reflow heating, the deformation restricting portion 6 has the low melting point metal 18 by the second high melting point particles 18. In addition, the refractory metal layer 2b can be supported and the local collapse and expansion of the fuse element 2 can be suppressed.
  • the fuse element 2 includes the deformation restricting portion 6, the second high melting point particle 18 having a melting point higher than that of the low melting point metal layer 2a, the high melting point metal layer 2b and the low melting point metal layer 2a. You may form by making it press-fit into.
  • the deformation restricting portion 6 is formed by press-fitting the second high melting point particles 18 into a laminated body of the low melting point metal layer 2a and the high melting point metal layer 2b and embedding it in the low melting point metal layer 2a. At this time, it is preferable that the second high melting point particle 18 penetrates the low melting point metal layer 2a and the high melting point metal layer 2b in the thickness direction. Thereby, even when the high melting point metal layer 2b is supported by the second high melting point particles 18 and the low melting point metal is melted by the reflow heating, the deformation restricting portion 6 has the low melting point metal 18 by the second high melting point particles 18. In addition, the refractory metal layer 2b can be supported and the local collapse and expansion of the fuse element 2 can be suppressed.
  • the deformation restricting portion 6 forms the hole 11 in the low melting point metal layer 2 a, laminates the second high melting point metal layer 16, and further inserts the second high melting point particle 18 into the hole 11. Also good.
  • the deformation restricting portion 6 may be provided with a projecting edge portion 19 for joining the second high melting point particle 18 to the high melting point metal layer 2b.
  • the projecting edge portion 19 presses the first high melting point particle 17 into the high melting point metal layer 2 b and the low melting point metal layer 2 a, and then presses the fuse element 2 in the thickness direction, so that the second high melting point particle is pressed. It can be formed by crushing both ends of the particle 18.
  • transformation control part 6 is supported more firmly by joining the refractory metal layer 2b with the protrusion part 19 of the 2nd high melting point particle
  • the flow of the low-melting-point metal is suppressed by the second high-melting-point particles 18, and the high-melting-point metal layer 2 b is supported by the projecting edge portion 19 to further suppress the occurrence of local crushing and expansion of the fuse element 2. be able to.
  • Such a fuse element 1 has a circuit configuration shown in FIG.
  • the fuse element 1 is mounted on an external circuit via the terminal portions 5a and 5b, thereby being incorporated on the current path of the external circuit.
  • the fuse element 1 is not melted by self-heating while a predetermined rated current flows through the fuse element 2.
  • the fuse element 1 cuts off the current path of the external circuit by the fuse element 2 being melted by the self-heating of the fuse element 2 and breaking between the terminal parts 5a and 5b. (FIG. 30B).
  • the fuse element 2 selectively cools the low heat conductive portion 7 formed along the blocking portion 9 by the heat generated by the heat generated in the high heat conductive portion 8 being actively cooled through the cooling member 3. Can be overheated. Therefore, the fuse element 2 can melt the cutoff part 9 while suppressing the influence of heat on the terminal parts 5a and 5b.
  • the fuse element 2 can melt the refractory metal layer 2b at a temperature lower than its melting point and quickly blow out by utilizing the erosion action of the refractory metal layer 2b by the low melting point metal layer 2a. it can.
  • the fuse element may be formed by forming a heating element on the cooling member, and the fuse element may be blown by the heat generated by the heating element.
  • a heating element 61 and an insulating layer 62 covering the heating element 61 are formed on both sides of the groove portion 10 of one cooling member 3a.
  • the heating element 61 is a conductive member that generates heat when energized, and is made of, for example, nichrome, W, Mo, Ru, or a material containing these.
  • the heating element 61 is a paste obtained by mixing a powdery body of these alloys, compositions, or compounds with a resin binder or the like, forming a pattern on the cooling member 3a using a screen printing technique, and firing the pattern. Etc. can be formed.
  • the heating element 61 is formed on both sides of the groove portion 10 so as to be provided in the vicinity of the low heat conducting portion 7 where the blocking portion 9 of the fuse element 2 is formed. Therefore, in the fuse element 60, the heat generated by the heating element 61 can be transmitted to the low thermal conduction part 7 and the interruption part 9 can be fused.
  • the heating element 61 may be formed only on one side of the groove 10 or may be formed on both sides or one side of the groove 10 of the other cooling member.
  • the heating element 61 is covered with an insulating layer 62. As a result, the heating element 61 is superimposed on the fuse element 2 via the insulating layer 62.
  • the insulating layer 62 is provided to protect and insulate the heating element 61 and to efficiently transmit the heat of the heating element 61 to the fuse element 2 and is made of, for example, a glass layer.
  • the heating element 61 may be formed inside the insulating layer 62 laminated on the cooling member 3a. Further, the heating element 61 may be formed on the back surface opposite to the surface of the cooling member 3a where the groove 10 is formed, or may be formed inside the cooling member 3a.
  • the heating element 61 is connected to an external power supply circuit via the heating element electrode 63, and when it is necessary to cut off the current path of the external circuit, the heating element 61 Energized.
  • the fuse element 60 can cut off the current path of the external circuit by the fusing of the heat generating element 61, so that the blocking portion 9 of the fuse element 2 incorporated on the current path of the external circuit is melted.
  • the power supply from the power supply circuit is cut off, and the heat generation of the heating element 61 is stopped.
  • the heat of the heat generating element 61 is dissipated in the fuse element 2 through the high heat conducting portion 8 and the melting point of the fuse element 2 is selectively lower in the low heat conducting portion 7 than in the refractory metal layer 2b.
  • the melting starts from the melting point of the low melting point metal layer 2a, and the high melting point metal layer 2b starts to erode. Therefore, the fuse element 2 uses the erosion action of the high melting point metal layer 2b by the low melting point metal layer 2a, so that the high melting point metal layer 2b is melted at a temperature lower than its own melting temperature, so The current path of the external circuit can be interrupted.
  • the fuse element 70 has a heating element 61, an insulating layer 62, and a heating element extraction electrode 64 formed only on the left surface, for example, through the groove 10 of the insulating layer 62.
  • the fuse element 2 may be connected to the heating element extraction electrode 64 via connection solder (not shown).
  • the heating element 61 has one end connected to the heating element extraction electrode 64 and the other end connected to a heating element electrode 63 connected to an external power supply circuit.
  • the heating element 61 is thermally and electrically connected to the fuse element 2 via the heating element extraction electrode 64.
  • the fuse element 70 is provided with an insulating layer 62 having excellent thermal conductivity on the opposite side (the right side of FIG. 32A) of the groove portion 10 provided with the heating element 61 and the like, thereby increasing the height. You may make it align.
  • the fuse element 70 is formed with a heating path to the heating element 61 that reaches the heating element electrode 63, the heating element 61, the heating element extraction electrode 64, and the fuse element 2.
  • the fuse element 70 is connected to a power supply circuit that energizes the heating element 61 via the heating element electrode 63, and energization across the heating element electrode 63 and the fuse element 2 is controlled by the power supply circuit.
  • the fuse element 70 shown in FIG. 32 has a circuit configuration as shown in FIG. That is, the fuse element 70 generates heat by energizing the fuse element 2 connected in series with the external circuit via the terminal portions 5a and 5b and the fuse element 2 and the heating element lead electrode 64 to generate heat.
  • the terminal portions 5a and 5b of the fuse element 2 and the heating element electrode 63 are connected to an external circuit board.
  • the heating element 61 when it is necessary to cut off the current path of the external circuit, the heating element 61 is energized by the current control element provided in the external circuit. As a result, in the fuse element 70, due to the heat generated by the heating element 61, the blocking portion 9 of the fuse element 2 incorporated on the current path of the external circuit is melted. Thereby, the fuse element 1 can melt
  • the fuse element may be provided with a plurality of blocking portions 9 in the fuse element 2.
  • a fuse element 80 shown in FIG. 33 is provided with two blocking portions 9 in the fuse element 2 and two groove portions 10 at positions corresponding to the blocking portions 9 of the cooling member 3a. 33 is connected to the heating element 61 on the surface between the two grooves 10, the insulating layer 62 covering the heating element, and one end of the heating element 61 and also connected to the fuse element 2.
  • the heating element extraction electrode 64 is provided in this order.
  • the cooling member 3 a is provided with an insulating layer 62 on the opposite side of the groove 10 from the side on which the heating element 61 and the like are provided, and is substantially the same height as the heating element extraction electrode 64.
  • the fuse element 2 is mounted on the heating element lead-out electrode 64 and the insulating layer 62 through an appropriate connection solder, and is sandwiched between the pair of cooling members 3a and 3b.
  • the blocking portion 9 that overlaps the groove portion 10 is the low heat conduction portion 7
  • the portion that overlaps the insulating layer 62 is the high heat conduction portion 8.
  • the heating element 61 has one end connected to the heating element extraction electrode 64 and the other end connected to a heating element electrode 63 connected to an external power supply circuit. As a result, the heating element 61 is thermally and electrically connected to the fuse element 2 via the heating element extraction electrode 64.
  • the fuse element 80 is connected to the external circuit via the terminal portions 5a and 5b in series with the fuse element 2, and the fuse element 2 is energized through the energization path from the heating element electrode 63 to the fuse element 2 to generate heat.
  • This is a circuit configuration including a heating element 61 that melts.
  • the terminal portions 5a and 5b of the fuse element 2 and the heating element electrode 63 are connected to an external circuit board.
  • the heating element 61 when the current path of the external circuit needs to be interrupted, the heating element 61 is energized and heated by the current control element provided in the external circuit.
  • the heat generated by the heating element 61 is transmitted to the fuse element 2 through the insulating layer 62 and the heating element lead electrode 64, and the low heat conduction portions 7 provided on the left and right are positively heated, so that the blocking portion 9 is blown.
  • the fuse element 2 since the fuse element 2 actively cools the heat from the heating element 61 in the high heat conduction portion 8, the influence of heating the terminal portions 5a and 5b can be suppressed. Thereby, the fuse element 2 can melt
  • a fuse element 90 shown in FIGS. 34 to 36 is connected to a current path of an external circuit. When a current exceeding the rating is applied, the fuse element 90 is melted by self-heating (Joule heat) and cuts off the current path. The cooling element 92 is in contact with or close to the fuse element 91.
  • the fuse element 91 has a blocking portion 9 and a recess 93 that is separated from the cooling member 92.
  • the concave portion 93 separates the blocking portion 9 from the cooling member 92 to form the low thermal conductive portion 7 having relatively low thermal conductivity. 9 along the width direction perpendicular to the energizing direction of the fuse element 91.
  • the concave portion 93 is formed in a bridge shape so that the position corresponding to the blocking portion 9 of the fuse element 91 is separated from the cooling member 92.
  • the bridge-shaped recess 93 may be formed so that the top surface is flat, or as shown in FIG. 37, the top surface may be curved in an arc shape.
  • the fuse element 91 is formed with a convex portion 94 whose surface opposite to the surface on which the bridge-shaped concave portion 93 is formed protrudes from both sides of the concave portion 93.
  • the concave portion 93 can be formed by press-molding a flat plate-like fuse element.
  • the fuse element 91 has the same structure as the fuse element 2 described above. That is, the fuse element 91 is a low melting point metal such as solder or Pb-free solder containing Sn as a main component, or a laminated body of a low melting point metal and a high melting point metal, for example, a low melting point made of a metal containing Sn as a main component.
  • the metal layer 91a is an inner layer, and the outer layer laminated on the low-melting-point metal layer 91a includes a high-melting-point metal layer 91b made of Ag, Cu, or a metal mainly containing any of these.
  • the volume of the low melting point metal layer 91a is preferably larger than the volume of the high melting point metal layer 91b.
  • the fuse element 91 melts the high melting point metal by melting the low melting point metal by self-heating, and can thereby be melted and blown quickly. Therefore, the fuse element 91 can accelerate the corrosion action and can quickly shut off the blocking portion 9 by forming the volume of the low melting point metal layer 91a larger than the volume of the high melting point metal layer 91b.
  • the fuse element 90 is sandwiched by a pair of upper and lower cooling members 92a and 92b so that the fuse element 91 is separated from the cooling member 92a by the recess 93 in the fuse element 91 and has a relatively low thermal conductivity.
  • the high thermal conductivity portion 8 is formed which is in contact with or close to the cooling members 92a and 92b and has relatively high thermal conductivity.
  • the low heat conduction portion 7 is provided along the blocking portion 9 where the fuse element 91 is melted across the width direction orthogonal to the energization direction of the fuse element 91, and the high heat conduction portion 8 is at least partially at a portion other than the blocking portion 9. Is in thermal contact with the cooling members 92a and 92b by being in contact with or close to the cooling members 92a and 92b.
  • the cooling member 92 can be preferably made of an insulating material having high thermal conductivity such as ceramics, and can be molded into an arbitrary shape by powder molding or the like. Further, the cooling member 92 may be formed of a thermosetting or photocurable resin material. Alternatively, the cooling member 92 may be formed of a thermoplastic resin material. Further, the cooling member 92 may be formed of a silicone resin material or an epoxy resin material. Further, the cooling member 92 may be formed by forming a resin layer made of the above-described various resin materials on an insulating substrate.
  • the cooling member 92 preferably has a thermal conductivity of 1 W / (m ⁇ k) or more.
  • the cooling member 92 may be formed using a metal material, but it is preferable from the viewpoint of short circuit prevention with surrounding components and handling properties to cover the surface with insulation.
  • the pair of upper and lower cooling members 92a and 92b are joined together by, for example, an adhesive to form an element housing.
  • the cooling member 92 b that supports the surface of the fuse element 91 opposite to the surface on which the concave portion 93 is formed is a bridge on the surface facing the fuse element 91.
  • the groove portion 10 is formed at a position corresponding to the convex portion 94 protruding to the opposite side of the concave portion 93 and is separated from the convex portion 94.
  • the cooling member 92b is connected to a portion other than the blocking portion 9 of the fuse element 91 by the adhesive 15 described above.
  • the cooling member 92 a that supports the surface of the fuse element 91 where the concave portion 93 is formed has a flat surface facing the fuse element 91.
  • the cooling member 92a is formed with a metal layer 95 at a position corresponding to the high heat conduction portion 8, and the metal layer 95 and the fuse element 91 are electrically and mechanically connected via a conductive connecting material such as solder 96. It is connected.
  • the conductive adhesive 15 may be used with the cooling member 92a and the fuse element 91 as a connecting material.
  • the cooling members 92a and 92b and the high thermal conductive portion 8 of the fuse element 91 are connected via the adhesive 15 and the solder 96, the mutual adhesion is enhanced, and the heat is more efficiently cooled. 92a and 92b can be transmitted.
  • the metal layer 95 is divided on both sides in the energization direction of the fuse element 91 with a position corresponding to the position where the recess 93 is formed as a boundary.
  • the cooling member 92a has a surface opposite to the surface on which the fuse element 91 is mounted as a mounting surface on the external circuit board on which the fuse element 90 is mounted, and a pair of external connection electrodes 97a and 97b are formed. ing. These external connection electrodes 97a and 97b are connected to a connection electrode formed on the external circuit board by a connection material such as solder.
  • the external connection electrodes 97a and 97b are connected to the metal layer 95 through a through hole 98a in which a conductive layer is formed and a castellation 98b formed on the side surface of the cooling member 92a.
  • the fuse element 90 the pair of external connection electrodes 97a and 97b are connected via the fuse element 91, and the fuse element 91 constitutes a part of the energization path of the external circuit. Further, the fuse element 90 can cut off the energization path of the external circuit when the fuse element 91 is fused at the cut-off portion 9.
  • the fuse element 90 is provided with the low heat conduction part 7 along the interruption part 9 in the plane of the fuse element 91, and the high heat conduction part 8 is formed in a part other than the interruption part 9.
  • the fuse element 91 when the fuse element 91 generates heat during overcurrent exceeding the rating, the heat of the high heat conducting portion 8 is positively released to the outside, and the heat generation in portions other than the blocking portion 9 is suppressed, and the blocking portion
  • the heat can be concentrated on the low heat conducting portion 7 formed along the line 9, and the blocking portion 9 can be melted while suppressing the influence of heat on the external connection electrodes 97a and 97b.
  • the fuse element 90 can melt
  • the fuse element 90 has the fuse element 91 formed in a substantially rectangular plate shape, and has a reduced resistance by shortening the length in the energizing direction, improving the current rating, By suppressing overheating of the external connection electrodes 97a and 97b connected through connection solder or the like, problems such as melting of the surface mount connection solder can be solved, and downsizing can be realized.
  • the fuse element 91 has a larger area of the high heat conduction portion 8 than that of the low heat conduction portion 7. As a result, the fuse element 91 selectively heats and melts the interrupting portion 9 and actively releases the heat of parts other than the interrupting portion 9 to suppress the influence of overheating of the external connection electrodes 97a and 97b, thereby reducing the size. Higher rating can be achieved.
  • the length L 2 of the recess 93 formed in the fuse element 91 in the energizing direction of the fuse element 91 is such that when the substantially rectangular plate-shaped fuse element 91 is used as shown in FIG.
  • the width is preferably equal to or smaller than the minimum width in the portion 9, and more preferably equal to or smaller than 1 ⁇ 2 of the minimum width in the blocking portion 9 of the fuse element 91.
  • the minimum width in the blocking portion 9 refers to the minimum width in the width direction orthogonal to the conduction direction in the blocking portion 9 of the fuse element 91 on the surface of the substantially rectangular plate-shaped fuse element, and the blocking portion 9 is arcuate, tapered, If it is shaped like a step and is narrower than the part other than the blocking part 9, it means the minimum width.
  • the blocking part 9 is the same as the part other than the blocking part 9. When it is formed with a width, it refers to the width W 1 of the fuse element 91.
  • Fuse element 90 a minimum width less the length L 2 of the recess 93 in the blocking section 9, also by narrowing the half or less of the minimum width of the cut-off portion 9, suppressing the occurrence of arc discharge at the time of fusing, insulating Resistance can be improved.
  • the length L 2 of the recess 93 in the energizing direction of the fuse element 91 is preferably 0.5 mm or more.
  • the fuse element 90 is provided with the low heat conduction part 7 having a length of 0.5 mm or more, thereby forming a temperature difference with the high heat conduction part 8 at the time of overcurrent and selectively cutting off the interruption part 9.
  • the length L 2 of the recess 93 in the energizing direction of the fuse element 91 is 5 mm or less.
  • the fuse element 90 increases the area of the blocking portion 9, so that the time required for fusing is increased and the fast fusing property is inferior.
  • the scattering amount of the element 91 is increased, and there is a possibility that the insulation resistance is lowered by the molten metal adhering to the periphery.
  • the minimum gap between the high thermal conduction portion 8 of the adjacent fuse element 91 and the cooling members 92a and 92b is 100 ⁇ m or less.
  • the fuse element 91 is sandwiched between the cooling members 92a and 92b, so that the portion that is in contact with or close to the cooling members 92a and 92b is the high heat conducting portion 8.
  • the minimum gap between the high heat conducting portion 8 of the fuse element 91 and the cooling members 92a and 92b is set to 100 ⁇ m or less, so that the portions other than the blocking portion 9 of the fuse element 91 and the cooling members 92a and 92b are almost in close contact with each other.
  • Heat generated at the time of overcurrent exceeding the rating can be transmitted to the outside through the cooling members 92a and 92b, and only the blocking portion 9 can be selectively blown.
  • the minimum gap between the high heat conduction part 8 of the fuse element 91 and the cooling members 92a and 92b exceeds 100 ⁇ m, the thermal conductivity of the part falls and an expectation other than the interruption part 9 occurs at the time of overcurrent exceeding the rating. There is a risk of overheating and melting the parts that do not.
  • the fuse element 90 can also be used as the terminal portions 5a and 5b connected to the connection electrodes of the external circuit at both ends in the energizing direction of the fuse element 91, like the fuse element 2. Good.
  • the terminal portions 5a and 5b are directed to the back surface side of the cooling member 92a by fitting with the side edges of the cooling member 92a.
  • the fuse element 91 shown in FIG. 39 is sandwiched between a pair of upper and lower cooling members 92a and 92b, and a pair of terminal portions 5a and 5b are led out of the cooling members 92a and 92b, and are connected via the terminal portions 5a and 5b. It can be connected to connection electrodes of an external circuit.
  • the fuse element 91 is connected to the external circuit board via the through hole 98a, the castellation 98b and the external connection electrode 97.
  • the resistance of the entire fuse element can be reduced and the rating can be improved.
  • the process of providing the external connection electrodes 97a and 97b, the through hole 98a and the castellation 98b on the cooling member 92a is omitted, and the production process is simplified.
  • the cooling member 92a need not be provided with the external connection electrodes 97a and 97b, the through hole 98a, and the castellation 98b, but may be provided for cooling or for improving the connection strength.
  • the fuse element 91 may be provided with a deformation restricting portion 6 that suppresses the flow of the molten low melting point metal and restricts deformation.
  • a deformation restricting portion 6 that suppresses the flow of the molten low melting point metal and restricts deformation.
  • the fuse element 91 is fitted to the side surface of the cooling member 92a, and both ends are bent to the back side of the cooling member 92a, and the terminal portions 5a and 5b are cooled. You may form in the back surface side of 92a.
  • the fuse element 91 is fitted to the side surface of the cooling member 92a, and both ends thereof are bent to the outside of the cooling member 92a to form the terminal portions 5a and 5b outside the cooling member 92a. (See FIG. 19). At this time, the fuse element 91 may be bent so that the terminal portions 5a and 5b are flush with the back surface of the cooling member 92a, or may be bent so as to protrude from the back surface of the cooling member 92a.
  • the fuse element 91 is formed at the position where the terminal portions 5a and 5b are further bent from the side surface of the cooling member 92a to the back surface side or the outside, so that the low melting point metal constituting the inner layer flows out and the terminal portions 5a and 5b are connected. Inflow of the connecting solder to be suppressed can be suppressed, and fluctuations in the fusing characteristics due to local crushing and expansion can be prevented.
  • such a fuse element 90 has a circuit configuration shown in FIG.
  • the fuse element 90 is mounted on the external circuit via the external connection electrodes 97a and 97b or the terminal portions 5a and 5b, and is incorporated on the current path of the external circuit.
  • the fuse element 90 is not melted by self-heating while a predetermined rated current flows through the fuse element 91.
  • the fuse element 90 causes the fuse element 91 to melt due to self-heating, and the external connection electrodes 97a and 97b or the terminal portions 5a and 5b are cut off, thereby
  • the current path of the circuit is interrupted (FIG. 30B).
  • the fuse element 91 heats the heat generated by the high heat conduction portion 8 through the cooling members 92a and 92b, and the low heat conduction portion 7 formed along the blocking portion 9 is cooled. It can be selectively heated. Therefore, the fuse element 91 can melt the interrupting portion 9 while suppressing the influence of heat on the external connection electrodes 97a and 97b or the terminal portions 5a and 5b.
  • the fuse element 91 uses the erosion action of the high melting point metal layer 91b by the low melting point metal layer 91a, so that the high melting point metal layer 91b is melted at a temperature lower than its own melting point and can be quickly blown. it can.
  • the fuse element may connect a plurality of fuse elements 91 in parallel as a fuse element.
  • the fuse element 110 includes, for example, three fuse elements 91A, 91B, and 91C arranged in parallel on the cooling member 92a.
  • the fuse elements 91A to 91C are formed in a rectangular plate shape, and terminal portions 5a and 5b are bent at both ends.
  • the fuse elements 91A to 91C are connected in parallel by connecting the terminal portions 5a and 5b to a common connection electrode of the external circuit.
  • the fuse element 110 has a current rating equivalent to that of the above-described fuse element 90 using the single fuse element 91.
  • the fuse elements 91A to 91C are arranged in parallel at a distance so as not to contact the adjacent fuse elements at the time of melting.
  • a recess 93 is formed over the blocking portion 9 that blocks the current path between the terminal portions 5a and 5b, is isolated from the cooling member 92a, and protrudes on the opposite side of the bridge-shaped recess 93.
  • the portion 94 is separated from the groove portion 10 formed in the cooling member 92b.
  • the fuse elements 91A to 91C When the fuse elements 91A to 91C generate heat at the time of overcurrent exceeding the rating, the heat of the high heat conduction portion 8 is positively released to the outside through the cooling members 92a and 92b, and the heat generation of portions other than the blocking portion 9 is generated. While suppressing, the heat
  • the fuse elements 91A to 91C are blown sequentially because a large amount of current flows from the one having a low resistance value.
  • the fuse element 110 cuts off the current path of the external circuit by melting all the fuse elements 91A to 91C.
  • the fuse element 110 is supplied with a current exceeding the rating through the fuse elements 91A to 91C, and is sequentially melted to cause an arc when the last remaining fuse element 91 is melted. Even when a discharge occurs, the size of the fuse element 91 is reduced according to the volume of the fuse element 91. The melted fuse element is scattered over a wide area, and a new current path is formed by the scattered fuse element, or the scattered metal is It is possible to prevent adhesion to terminals and surrounding electronic components. Further, since the fuse element 110 is blown for each of the plurality of fuse elements 91A to 91C, less heat energy is required for fusing each fuse element, and can be cut off in a short time.
  • the fuse element 110 has a relatively high resistance, for example, by making the width of the interrupting portion 9 of one fuse element of the plurality of fuse elements 91 smaller than the width of the interrupting portion 9 of the other fuse element. The order may be controlled.
  • the fuse element 110 preferably includes three or more fuse elements 91 arranged in parallel, and the width of at least one fuse element 91 other than both sides in the parallel direction is made narrower than the width of other fuse elements.
  • the width of a part or all of the middle fuse element 91B is made narrower than the widths of the other fuse elements 91A and 91C, and a difference in cross-sectional area is provided. Therefore, the resistance of the fuse element 91B is relatively increased.
  • a current exceeding the rating is applied to the fuse element 110
  • a large amount of current is first supplied from the relatively low resistance fuse elements 91A and 91C, and the fuse element 110 is melted without arc discharge. Thereafter, the current concentrates on the remaining high-resistance fuse element 91B, and finally melts with arc discharge.
  • the fuse element 91B has a small scale depending on the volume of the fuse element 91B, and the molten metal explodes. Can be prevented.
  • the fuse element 110 is blown out of the fuse element 91B provided on the inner side, so that the molten metal of the fuse element 91B is melted first even if arc discharge occurs. , 91C. Therefore, scattering of the molten metal of the fuse element 91B can be suppressed, and a short circuit due to the molten metal can be prevented.
  • the fuse element 110 has a high melting point fuse element 111 having a melting temperature higher than that of the fuse element 91, and one or a plurality of fuse elements 91 and the high melting point fuse element 111 are arranged in parallel at a predetermined interval. May be.
  • the fuse element 110 includes three fuse elements 91A and 91C and a high melting point fuse element 111 arranged in parallel on a cooling member 92a.
  • the high melting point fuse element 111 can be formed using, for example, a high melting point metal such as Ag, Cu, or an alloy containing these as a main component.
  • the high melting point fuse element 111 may be composed of a low melting point metal and a high melting point metal.
  • the high melting point fuse element 111 can be manufactured in the same manner as the fuse element 91.
  • the refractory fuse element 111 is made, for example, by making the thickness of the refractory metal layer 91b thicker than the fuse element 91 or using a refractory metal having a higher melting point than the refractory metal used for the fuse element 91.
  • the melting point can be made higher than that of the fuse element 91.
  • the high melting point fuse element 111 is formed in a substantially rectangular plate shape similarly to the fuse elements 91A and 91C, and the terminal portions 112a and 112b are bent at both ends, and the terminal portions 112a and 112b are the fuse elements 91A and 91C.
  • the fuse element 110 has a current rating equal to or higher than that of the above-described fuse element 90 using the single fuse element 91.
  • the fuse elements 91A and 91C and the high melting point fuse element 111 are arranged in parallel at a distance so as not to contact the adjacent fuse element at the time of melting.
  • a recess 93 is formed over the blocking portion 9 that blocks the current path between the terminal portions 112a and 112b, and is isolated from the cooling member 92a.
  • a convex portion 94 protruding to the opposite side of the bridge-shaped concave portion 93 is separated from the groove portion 10 formed in the cooling member 92b.
  • the high melting point fuse element 111 When the high melting point fuse element 111 generates heat at the time of overcurrent exceeding the rating, the heat of the high heat conducting portion 8 is positively released to the outside, and the heat generation in portions other than the blocking portion 9 is suppressed and along the blocking portion 9. Thus, heat can be concentrated on the low heat conduction portion 7 formed in this manner, and the blocking portion 9 can be melted.
  • the fuse element 110 when the overcurrent exceeds the rating, the fuse elements 91A and 91C having a low melting point are blown first, and the high melting point fuse element 111 having a high melting point is blown last. Therefore, the high melting point fuse element 111 can be shut off in a short time according to its volume, and even when arc discharge occurs when the last remaining high melting point fuse element 111 is melted, the high melting point fuse element 111 It becomes a small scale according to the volume of 111, can prevent explosive scattering of the molten metal, and can greatly improve the insulation after fusing.
  • the fuse element 110 cuts off the current path of the external circuit when all the fuse elements 91A and 91C and the high melting point fuse element 111 are melted.
  • the high melting point fuse element 111 is arranged at a place other than both sides in the parallel direction in which a plurality of the high melting point fuse elements 111 are arranged in parallel with the fuse element 91.
  • the high melting point fuse element 111 is preferably arranged between the two fuse elements 91A and 91C as shown in FIG.
  • the molten metal of the high melting point fuse element 111 is melted by the outer fuse elements 91A and 91C previously blown. Therefore, it is possible to prevent the molten metal from being scattered by the high melting point fuse element 111 and to prevent a short circuit due to the molten metal.
  • the fuse element to which the present invention is applied may use a fuse element 112 in which a plurality of blocking portions 9 are arranged in parallel.
  • the same components as those of the above-described fuse element 91 are denoted by the same reference numerals and the details thereof are omitted.
  • the fuse element 112 is formed in a plate shape, and terminal portions 5a and 5b connected to an external circuit are provided at both ends.
  • a plurality of blocking portions 9 are formed between the pair of terminal portions 5a and 5b, and at least one, preferably all the blocking portions 9 are formed with a recess 93 that is separated from the cooling member 92a.
  • the fuse element 112 preferably contains a low melting point metal layer and a high melting point metal layer in the same manner as the fuse element 91 described above, and can be formed in various configurations.
  • each of the blocking portions 9A to 9C is mounted across the terminal portions 5a and 5b, thereby constituting a plurality of energization paths of the fuse element 112.
  • the plurality of interrupting portions 9A to 9C are melted by self-heating due to overcurrent, and all the interrupting portions 9A to 9C are melted to interrupt the current path between the terminal portions 5a and 5b.
  • the fuse element 112 also melts when the current exceeding the rating is energized, so that each of the interrupting portions 9A to 9C is sequentially melted. Therefore, arc discharge generated when the last remaining interrupting portion 9 is melted is also generated. It is possible to prevent the fused fuse element from spreading over a wide area, a new current path being formed by the scattered metal, or the scattered metal from adhering to the terminals and surrounding electronic components, etc. . Further, since the fuse element 112 is blown for each of the plurality of cut-off portions 9A to 9C, less heat energy is required for fusing each of the cut-off portions 9A to 9C, and can be cut off in a short time.
  • the fuse element 112 has a relatively high resistance by making the cross-sectional area of a part or all of one of the plurality of blocking portions 9A to 9C smaller than the cross-sectional area of the other fusing portion. Also good.
  • the fuse element 112 is provided with three cut-off portions 9A, 9B, 9C as shown in FIG. 48, and has three or more blow-off portions such as the middle cut-off portion 9B being blown last, It is preferable that the fusing part is blown last.
  • the fuse element 112 can sequentially melt the interrupting portions 9A to 9C, and arc discharge is generated only when the interrupting portion 9 having a small cross-sectional area is melted. Therefore, explosive scattering of the molten metal can be prevented.
  • the molten metal of the interruption portion 9B can be captured by the outer interruption portions 9A and 9C that have been blown first, It is possible to suppress scattering of the molten metal in the blocking portion 9B and prevent a short circuit due to the molten metal.
  • the fuse element 112 in which such a plurality of blocking portions 9 are formed has a central portion 2 of a plate-like body 113 containing a plate-like low melting point metal and a high melting point metal. After punching out the portion into a rectangular shape, it can be manufactured by forming the concave portion 93 and the terminal portions 5a and 5b by press molding or the like.
  • the fuse element 112 is integrally supported by the terminal portions 5a and 5b on both sides of the three blocking portions 9A to 9C arranged in parallel.
  • the provided fuse element 112 may be manufactured by connecting a plate-like body constituting the terminal portions 5 a and 5 b and a plurality of plate-like bodies constituting the blocking portion 9.
  • FIG. 49 (B) in the fuse element 112, one end of the three blocking portions 9A to 9C arranged in parallel is integrally supported by the terminal portion 5a, and the terminal portion 5b is formed at the other end. It may be a thing.
  • the fuse element may be formed by forming a heating element on the cooling member, and the fuse element may be blown by the heat generated by the heating element.
  • a heating element 61 is formed on both sides of a position facing the low heat conduction portion 7 of one cooling member 92a, and the heating element 61 is covered with an insulating layer 62. ing.
  • the heating element 61 is a conductive member that generates heat when energized, and is made of, for example, nichrome, W, Mo, Ru, or a material containing these, and a screen printing technique or the like is applied to the cooling member 92a. Can be formed.
  • the heating element 61 is provided in the vicinity of the low heat conducting portion 7 in which the blocking portion 9 of the fuse element 91 is formed. Therefore, in the fuse element 120, the heat generated by the heating element 61 can be transmitted to the low thermal conduction part 7 and the interruption part 9 can be melted. Note that the heating element 61 may be formed only on one side of the position facing the low heat conducting portion 7 or may be formed on both sides or one side of the groove portion 10 of the other cooling member 92b.
  • the heating element 61 is covered with an insulating layer 62. As a result, the heating element 61 is superimposed on the fuse element 91 via the insulating layer 62.
  • the insulating layer 62 is provided to protect and insulate the heating element 61 and to efficiently transfer the heat of the heating element 61 to the fuse element 91, and is made of, for example, a glass layer.
  • the heating element 61 may be formed on the back surface opposite to the surface of the cooling member 92a, or may be formed inside the cooling member 92a.
  • the heating element 61 is connected to an external power supply circuit via the heating element electrode 63, and when it is necessary to cut off the current path of the external circuit, Energized.
  • the fuse element 120 can cut off the current path of the external circuit by melting the breaker 9 of the fuse element 91 incorporated on the current path of the external circuit due to the heat generated by the heating element 61.
  • the power supply from the power supply circuit is cut off, and the heat generation of the heating element 61 is stopped.
  • the heat of the heating element 61 dissipates the heat of the heating element 61 through the high heat conduction portion 8 and the melting point of the fuse element 91 is lower than that of the refractory metal layer 91b in the low heat conduction portion 7 selectively. Melting starts from the melting point of the low melting point metal layer 91a, and the blocking part 9 is quickly melted by the erosion action of the high melting point metal layer 91b, thereby blocking the current path of the external circuit.
  • the fuse element is similar to the fuse element 130 shown in FIG. 51A, and the heating element 61, the insulating layer 62, The heating element extraction electrode 64 may be formed, and the fuse element 91 may be connected to the heating element extraction electrode 64 via connection solder (not shown).
  • the heating element 61 has one end connected to the heating element extraction electrode 64 and the other end connected to a heating element electrode 63 connected to an external power supply circuit.
  • the heating element extraction electrode 64 is connected to the fuse element 91.
  • the heating element 61 is thermally and electrically connected to the fuse element 91 via the heating element extraction electrode 64.
  • the fuse element 130 is provided with an insulating layer 62 having excellent thermal conductivity on the side opposite to the one side (the right side in FIG. 51A) of the low thermal conductive portion 7 provided with the heating element 61 and the like. You may make it match.
  • the fuse element 130 an energization path to the heating element 61 that reaches the heating element electrode 63, the heating element 61, the heating element extraction electrode 64, and the fuse element 91 is formed.
  • the fuse element 130 is connected to a power supply circuit that energizes the heating element 61 via the heating element electrode 63, and energization across the heating element electrode 63 and the fuse element 91 is controlled by the power supply circuit.
  • the fuse element 130 has a circuit configuration as shown in FIG. That is, the fuse element 130 generates heat by energizing the fuse element 91 connected in series with the external circuit via the terminal portions 5a and 5b and the fuse element 91 and the heating element lead electrode 64 to generate heat.
  • This is a circuit configuration including a heating element 61 that melts.
  • the terminal portions 5a and 5b of the fuse element 91 and the heating element electrode 63 are connected to an external circuit board.
  • the heating element 61 is energized by the current control element provided in the external circuit.
  • the breaker 9 of the fuse element 91 incorporated on the current path of the external circuit is melted by the heat generated by the heating element 61.
  • the fuse element 91 can melt
  • the fuse element may be provided with a plurality of blocking portions 9 in the fuse element 91.
  • the fuse element 140 shown in FIG. 52A is provided with two blocking portions 9 in the fuse element 91 and covers the heating element 61 and the heating element between positions facing the blocking portion 9 of the cooling member 92a.
  • a heating element extraction electrode 64 connected to the insulating layer 62 and one end of the heating element 61 and to the fuse element 91 is provided in this order.
  • the cooling member 92 a is provided with insulating layers 62 on both sides of the heating element 61, and has substantially the same height as the heating element extraction electrode 64.
  • the fuse element 91 is mounted on the heating element extraction electrode 64 and the insulating layer 62 through an appropriate connection solder, and is sandwiched between the pair of cooling members 92a and 92b.
  • the blocking portion 9 separated from the cooling member 92 a by the concave portion 93 is the low thermal conduction portion 7
  • the portion overlapping the insulating layer 62 is the high thermal conduction portion 8.
  • the heating element 61 has one end connected to the heating element extraction electrode 64 and the other end connected to a heating element electrode 63 connected to an external power supply circuit. As a result, the heating element 61 is thermally and electrically connected to the fuse element 91 via the heating element extraction electrode 64.
  • the fuse element 140 shown in FIG. 52 (A) has a circuit configuration as shown in FIG. 52 (B).
  • the fuse element 140 generates heat by energizing the fuse element 91 connected in series with the external circuit via the terminal portions 5a and 5b and the energization path from the heating element electrode 63 to the fuse element 91, thereby generating the fuse element 91.
  • This is a circuit configuration including a heating element 61 that melts.
  • the terminal portions 5a and 5b of the fuse element 91 and the heating element electrode 63 are connected to the external circuit board.
  • the heating element 61 when the current path of the external circuit needs to be interrupted, the heating element 61 is energized and heated by the current control element provided in the external circuit.
  • the heat generated by the heating element 61 is transmitted to the fuse element 91 through the insulating layer 62 and the heating element extraction electrode 64, and the low heat conduction portions 7 provided on the left and right are positively heated, so that the blocking portion 9 is melted.
  • the fuse element 91 actively cools the heat from the heating element 61 in the high heat conducting portion 8, and therefore, the influence of heating the terminal portions 5a and 5b can be suppressed. Thereby, the fuse element 91 can melt
  • the fuse element 91 since the fuse element 91 is blown, the energization path of the heating element 61 is also cut off, so that the heating of the heating element 61 is also stopped.
  • the fuse element has the heat insulating member 4 having a lower thermal conductivity than the cooling members 92a and 92b, and the blocking portion 9 of the fuse element 91 is in contact with or close to the heat insulating member 4, so that a relatively high heat conductive portion is obtained.
  • the low thermal conductivity portion 7 having a thermal conductivity lower than 8 may be formed.
  • the heat insulating member 4 is disposed at a position corresponding to the recess 93 of the fuse element 91 of the cooling member 92a, thereby being brought into contact with or close to the blocking portion 9.
  • the fuse element may be configured such that the cooling member 92 a is superimposed on one surface side of the fuse element 91 and the other surface side is covered with the cover member 13.
  • the cooling member 92 a is in contact with or close to the lower surface of the fuse element 91, and the upper surface is covered with the cover member 13.
  • the cooling member 92 a is separated from the blocking portion 9 of the fuse element 91 by the recess 93, and is in contact with or close to a portion other than the blocking portion 9.
  • a difference in thermal conductivity is provided between the blocking portion 9 and a portion other than the blocking portion 9, and the low thermal conductive portion 7 extends along the blocking portion 9 in the plane of the fuse element 91.
  • the high heat conduction portion 8 is formed in a portion other than the blocking portion 9.
  • the fuse element 150 transmits the heat of the fuse element 91 to the circuit board side by arranging the cooling member 92a on the mounting surface side where the terminal portions 5a and 5b are led out and mounted on the circuit board on which the external circuit is formed. And can be cooled more efficiently.
  • the cooling member 92a may be disposed on the side opposite to the mounting surface on the circuit board, and the cover member 13 may be disposed on the mounting surface side where the terminal portions 5a and 5b are led out.
  • the terminal portions 5a and 5b are in contact with the side surface of the cover member 13, the transfer of heat to the terminal portions 5a and 5b through the cooling member 92a is suppressed, and the solder for surface mounting is dissolved. Risk can be further reduced.
  • the fuse element 91 has a recess in which the blocking portion 9 on the opposite surface is not formed with a protruding portion other than the blocking portion 9 as shown in FIGS. 55 and 56. Only 99 may be provided.
  • the recess 99 is relatively formed along the blocking portion 9 by, for example, pressing along the blocking portion 9 of the fuse element 91 or by providing a metal layer on both sides of the blocking portion 9. It can be formed by processing.
  • the fuse element 91 provided with the concave portion 99 is not formed with the convex portions 94 protruding from both sides of the blocking portion 9. Therefore, the fuse element 160 using the fuse element 91 provided with the recess 99 can flatten both the upper and lower pair of cooling members 92a and 92b that sandwich the fuse element 91.
  • the fuse element 160 also has a difference in thermal conductivity between the blocking portion 9 and a portion other than the blocking portion 9, and the low thermal conduction portion 7 is provided along the blocking portion 9 in the plane of the fuse element 91, and the blocking is performed.
  • the high heat conduction portion 8 is formed at a portion other than the portion 9.
  • the fuse element 160 positively releases the heat of the high heat conducting portion 8 to the outside when the fuse element 91 generates heat at the time of overcurrent exceeding the rating, and suppresses the heat generation of portions other than the blocking portion 9. Heat can be concentrated on the low heat conduction part 7 formed along the blocking part 9, so that the blocking part 9 can be fused.
  • the fuse element 160 may directly hold the fuse element 91 between the cooling members 92a and 92b without providing the metal layer 95. At this time, an adhesive 15 can be appropriately interposed between the cooling members 92 a and 92 b and the fuse element 91.
  • the cooling member 92b may be provided with the groove portion 10 at a position corresponding to the blocking portion 9.
  • the fuse element 91 may be provided with the recess 99 on any one surface, or may be provided with the recess 99 on both surfaces.
  • the concave portions 99 formed on both surfaces of the fuse element 91 may be formed at opposing positions or may not be opposed.

Landscapes

  • Fuses (AREA)

Abstract

La présente invention concerne un dispositif fusible qui peut augmenter la valeur nominale par abaissement de la résistance d'un élément fusible, et peut obtenir une réduction de la taille. La présente invention est pourvue d'un élément fusible (2) et d'un élément de refroidissement (3). L'élément fusible (2) est pourvu : d'une partie de faible conduction thermique (7), qui présente une conductivité thermique relativement faible, et dans laquelle une partie de rupture (9) qui fond et se rompt sous l'effet de la chaleur, est séparée de l'élément de refroidissement (3) ; et de parties de conduction thermique élevée (8) qui sont situées dans des zones à l'exception de la partie de rupture (9), sont en contact avec l'élément de refroidissement (3) ou se trouvent à proximité de ce dernier, et présentent une conductivité thermique relativement élevée.
PCT/JP2016/079599 2015-10-09 2016-10-05 Dispositif fusible WO2017061458A1 (fr)

Priority Applications (3)

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KR1020187007640A KR102026035B1 (ko) 2015-10-09 2016-10-05 퓨즈 소자
CN201680056025.0A CN108028158B (zh) 2015-10-09 2016-10-05 熔丝元件
US15/766,870 US10727019B2 (en) 2015-10-09 2016-10-05 Fuse device

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JP2015-201383 2015-10-09
JP2015201383 2015-10-09
JP2016004691A JP2017073373A (ja) 2015-10-09 2016-01-13 ヒューズ素子
JP2016-004691 2016-01-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022113804A1 (fr) * 2020-11-27 2022-06-02 デクセリアルズ株式会社 Élément de protection
WO2024070418A1 (fr) * 2022-09-28 2024-04-04 デクセリアルズ株式会社 Élément de protection et procédé de fabrication d'élément de protection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2022107848A1 (fr) 2020-11-18 2022-05-27

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS581942A (ja) * 1981-06-03 1983-01-07 ゼネラル・エレクトリツク・カンパニイ 広範囲の電流を遮断する特に小電流の遮断に適した高圧ヒユ−ズ
JPS58134853U (ja) * 1982-03-08 1983-09-10 マツダ株式会社 プリント配線フユ−ズ
JPS62193029A (ja) * 1986-03-20 1987-08-24 アンリツ株式会社 ヒユ−ズ素子の製法
JPH01287905A (ja) * 1988-05-13 1989-11-20 Murata Mfg Co Ltd インダクタンス素子およびその製造方法
JPH08236004A (ja) * 1995-02-27 1996-09-13 Kyocera Corp チップヒューズ及びその製造方法
JP2003263949A (ja) * 2002-01-10 2003-09-19 Cooper Technol Co 低抵抗ポリマーマトリクスヒューズ装置および方法
JP2004152518A (ja) * 2002-10-29 2004-05-27 Matsushita Electric Ind Co Ltd 回路保護素子およびその製造方法
JP2013229295A (ja) * 2012-03-29 2013-11-07 Dexerials Corp 保護素子

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4735387B2 (ja) * 2006-04-18 2011-07-27 パナソニック株式会社 面実装型電流ヒューズ
JP6420053B2 (ja) 2013-03-28 2018-11-07 デクセリアルズ株式会社 ヒューズエレメント、及びヒューズ素子
JP6437239B2 (ja) * 2013-08-28 2018-12-12 デクセリアルズ株式会社 ヒューズエレメント、ヒューズ素子
JP2015111526A (ja) 2013-12-06 2015-06-18 デクセリアルズ株式会社 保護素子及びヒューズエレメント

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS581942A (ja) * 1981-06-03 1983-01-07 ゼネラル・エレクトリツク・カンパニイ 広範囲の電流を遮断する特に小電流の遮断に適した高圧ヒユ−ズ
JPS58134853U (ja) * 1982-03-08 1983-09-10 マツダ株式会社 プリント配線フユ−ズ
JPS62193029A (ja) * 1986-03-20 1987-08-24 アンリツ株式会社 ヒユ−ズ素子の製法
JPH01287905A (ja) * 1988-05-13 1989-11-20 Murata Mfg Co Ltd インダクタンス素子およびその製造方法
JPH08236004A (ja) * 1995-02-27 1996-09-13 Kyocera Corp チップヒューズ及びその製造方法
JP2003263949A (ja) * 2002-01-10 2003-09-19 Cooper Technol Co 低抵抗ポリマーマトリクスヒューズ装置および方法
JP2004152518A (ja) * 2002-10-29 2004-05-27 Matsushita Electric Ind Co Ltd 回路保護素子およびその製造方法
JP2013229295A (ja) * 2012-03-29 2013-11-07 Dexerials Corp 保護素子

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022113804A1 (fr) * 2020-11-27 2022-06-02 デクセリアルズ株式会社 Élément de protection
WO2024070418A1 (fr) * 2022-09-28 2024-04-04 デクセリアルズ株式会社 Élément de protection et procédé de fabrication d'élément de protection

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