WO2020105391A1 - Structure de circuit - Google Patents

Structure de circuit

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Publication number
WO2020105391A1
WO2020105391A1 PCT/JP2019/042820 JP2019042820W WO2020105391A1 WO 2020105391 A1 WO2020105391 A1 WO 2020105391A1 JP 2019042820 W JP2019042820 W JP 2019042820W WO 2020105391 A1 WO2020105391 A1 WO 2020105391A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat transfer
transfer sheet
heat
insulating plate
bus bar
Prior art date
Application number
PCT/JP2019/042820
Other languages
English (en)
Japanese (ja)
Inventor
勇貴 藤村
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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
Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2020105391A1 publication Critical patent/WO2020105391A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/02—Arrangements of circuit components or wiring on supporting structure
    • H05K7/06—Arrangements of circuit components or wiring on supporting structure on insulating boards, e.g. wiring harnesses
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Definitions

  • the technology disclosed in the present specification relates to a circuit configuration body having a heat-generating component.
  • a heat dissipation structure of an electronic unit box including power circuit parts is known (Japanese Patent Laid-Open No. 2002-176279).
  • This electronic unit box is configured such that an electronic unit including a power circuit component is housed in a housing case.
  • a bus bar is connected to the electronic unit.
  • the bus bar is integrated with the heat dissipation plate via an insulating heat conductive sheet.
  • the end of the heat sink is connected to the housing case.
  • the heat generated in the power circuit component is transmitted in the order of the bus bar, the heat conductive sheet, the heat dissipation plate, and the housing case, and is radiated to the outside from the housing case.
  • the heat conductive sheet alone electrically insulates the bus bar from the heat sink.
  • the heat conductive sheet alone electrically insulates the bus bar from the heat sink.
  • the technique described in the present specification has been completed based on the above circumstances, and an object thereof is to improve heat dissipation of a circuit structure while maintaining electrical insulation. ..
  • the circuit structure described in the present specification includes a heat-generating component that generates heat when energized, and an electrical connecting portion that is electrically connected to the heat-generating component and that is thermally conductively connected to a position different from the electrical connecting portion.
  • a bus bar having a portion, and a mounting portion having an upper surface and a lower surface for mounting the heat generating component on the upper surface, and penetrating the upper surface and the lower surface and accommodating the heat transfer connection portion.
  • a base member having a through hole, an insulating plate made of an insulative material, which is overlaid on the lower side of the heat transfer connection part, and a metal heat dissipation member, which is overlaid on the underside of the insulating plate, An insulating heat transfer sheet interposed between the heat transfer connection portion and the insulating plate and between at least one of the insulating plate and the heat dissipation member.
  • the heat generated in the heat-generating component at the time of energization is transferred to the electrical connection part, and the heat is conducted to the heat transfer connection part in the bus bar.
  • the heat reaching the heat transfer connection is transferred from the insulating plate to the heat dissipation member with the heat transfer sheet interposed.
  • the heat generated in the heat generating component is efficiently moved to the heat radiating member and is radiated to the outside from the heat radiating member.
  • the heat dissipation of the circuit structure is improved.
  • bus bar electrically connected to the heat-generating component and the metal heat radiation member are reliably electrically insulated by the insulating heat transfer sheet and the insulating plate. This allows It is possible to improve the heat dissipation of the circuit structure while maintaining the electrical insulation.
  • the heat transfer sheet includes a first heat transfer sheet interposed between the heat transfer connection portion and the insulating plate, and a second heat transfer sheet interposed between the insulating plate and the heat dissipation member. ,including.
  • the heat transfer sheet is made of elastically deformable material.
  • the heat generated from the heat-generating components causes the busbar, insulating plate, and heat dissipation member to expand. Since the coefficient of thermal expansion of the metal and the coefficient of thermal expansion of the insulating material are different, a gap may occur between the bus bar, the insulating plate, and the heat dissipation member. Since the thermal conductivity of air is very low, it is feared that the heat dissipation of the circuit component will be reduced if a gap is generated. According to the above configuration, elastic deformation of the heat transfer sheet can prevent a gap from being formed between the bus bar, the insulating plate, and the heat dissipation member at least in the portion where the heat transfer sheet is interposed. This can improve the heat dissipation of the circuit structure.
  • the heat dissipation member has a pedestal portion projecting toward the insulating plate at a position corresponding to the insulating plate.
  • the pedestal portion can press the insulating plate toward the heat transfer connecting portion, so that a gap is prevented from being formed between the insulating plate and the heat transfer connecting portion. You can This can improve the heat dissipation of the circuit structure.
  • the heat generating component is a relay, and the relay has a power terminal to which power is supplied, and the electrical connection part of the bus bar is connected to the power terminal.
  • the heat generated from the power terminal to which the power is energized is relatively large. Therefore, by providing the heat transfer connection portion on the bus bar connected to the power terminal, the heat can be efficiently transferred from the relay, so that the heat dissipation of the circuit component can be improved.
  • FIG. 3 is an exploded cross-sectional view showing the circuit structure, taken along a plane corresponding to line VI-VI in FIG. Sectional drawing which shows the circuit structure of the state which bolted the screw hole from the state shown in FIG. VI-VI line sectional view in FIG.
  • the circuit structure 10 is mounted on, for example, a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, and supplies power from a power source (not shown) such as a battery to a load (not shown) such as a motor. Take control.
  • the circuit structure 10 can be arranged in any direction, but in the following description, the Z direction is upward, the Y direction is front, and the X direction is left. Further, regarding a plurality of the same members, only some of the members may be denoted by the reference numerals, and other members may be omitted.
  • the circuit structure 10 includes a base member 11, a relay 12 (an example of a heat-generating component) arranged on the base member 11, and electronic components such as a fuse 13.
  • the base member 11 is formed by injection molding an insulating synthetic resin into a predetermined shape.
  • the synthetic resin forming the base member 11 may include a filler such as glass fiber.
  • the base member 11 has a flat plate shape in the vertical direction as a whole, and has an upper surface 11A and a lower surface 11B.
  • the outer shape of the base member 11 is a substantially pentagonal shape in which the left front corner of the rectangle is cut out when viewed from above.
  • the outer shape of the base member 11 is not limited to the shape of this embodiment.
  • cylindrical metal collars 14 are provided at the four corners of the base member 11.
  • the collar 14 is arranged on the base member 11 by a known method such as insert molding or press fitting.
  • a bolt 15 is inserted into the inside of the collar 14.
  • a plurality of (two in the present embodiment) first terminal blocks 16 protruding upward are formed on the upper surface 11A of the base member 11 at positions closer to the rear in the front-back direction.
  • the first terminal block 16 has a rectangular parallelepiped shape.
  • a nut 17 is arranged on the upper surface of the first terminal block 16 by a known method such as insert molding or press fitting (see FIG. 1).
  • a plurality of (two in the present embodiment) second terminal blocks 18 projecting upward are formed on the upper surface 11A of the base member 11 at a position closer to the front part in the front-back direction.
  • the second terminal block 18 is set to have a smaller height dimension in the vertical direction and a smaller width dimension in the horizontal direction than the first terminal block 16.
  • a nut 19 is arranged on the front side surface of the second terminal block 18 by a known method such as insert molding or press fitting (see FIG. 1).
  • a first through hole 20 (an example of a through hole) penetrating the base member 11 in the up-down direction is formed at a position near the left rear end of the base member 11. Further, in the base member 11, a second through hole 21 (an example of a through hole) that penetrates the base member 11 in the up-down direction is formed in front of the first through hole 20.
  • the first through hole 20 has a rectangular shape when viewed from above.
  • the second through hole 21 has a shape in which a left front corner of a rectangle is cut out when viewed from above.
  • a fuse mounting hole 22 is formed at a position near the front end of the base member 11 so as to penetrate the base member 11 in the vertical direction and to which the fuse 13 is mounted.
  • the fuse mounting hole 22 has a rectangular shape when viewed from above, and is formed to have the same outer shape as the fuse 13 described later or a slightly larger size.
  • the above-mentioned second terminal blocks 18 are provided at positions outside the fuse mounting hole 22 in the left-right direction.
  • the base member 11 is formed so as to be recessed downward near substantially the center in the front-rear direction and the left-right direction, and a relay mounting portion 23 (an example of a mounting portion) to which the relay 12 is mounted is formed.
  • the relay mounting portion 23 has a rectangular shape when viewed from above, and is slightly larger than the outer shape of the relay 12.
  • the front left corner and the rear right corner of the relay mounting portion 23 are recessed portions 24 recessed in the front-rear direction.
  • a nut 25 is disposed in the recess 24 by a known method such as insert molding or press fitting (see FIG. 1).
  • the relay 12 is a so-called mechanical type having a contact portion and a coil portion (not shown) inside a case 26 having a rectangular parallelepiped shape.
  • a first power terminal 27 provided on the rear side and a second power terminal 28 provided on the front side are provided side by side in the front-rear direction.
  • heat is generated at the contact portion and the heat is conducted to the first power terminal 27 and the second power terminal 28.
  • Each of the first power terminal 27 and the second power terminal 28 is formed with a screw hole 29 extending in the left-right direction.
  • a fixed convex portion 30 having a rectangular shape when viewed from above is projected.
  • An insertion hole 31 is formed in the fixed convex portion 30 in the vertical direction.
  • a first bus bar 33 (an example of a bus bar) is fixed to the first power terminal 27 by screwing a screw 41 into the screw hole 29.
  • a second bus bar 35 (an example of a bus bar) is fixed to the second power terminal 28 by screwing a screw 41 into the screw hole 29.
  • the first bus bar 33 and the second bus bar 35 are formed by pressing a metal plate material into a predetermined shape.
  • a metal having a high thermal conductivity and a low electric resistance such as copper, a copper alloy, aluminum, or an aluminum alloy, can be appropriately selected.
  • the fuse 13 has a rectangular parallelepiped shape.
  • Lead terminals 36 are formed on the right side surface and the left side surface of the fuse 13 so as to project outward in the left-right direction.
  • the lead terminal 36 is made of a metal plate material.
  • the lead terminal 36 is formed with an insertion hole 37 that penetrates in the front-rear direction.
  • the lead terminals 36 are arranged to overlap the front side surfaces of the two second terminal blocks 18 arranged in the left-right direction.
  • the first bus bar 33 extends in the left-right direction and is bent in a crank shape when viewed from the front-rear direction.
  • the first bus bar 33 includes an external connection portion 38 mounted on the upper surface of the first terminal block 16 and a first electrical connection portion 39 extending downward from a left end portion of the external connection portion 38 (an example of an electrical connection portion). And a first heat transfer connection part 40 (an example of the heat transfer connection part) extending leftward from the lower end of the first electrical connection part 39.
  • the external connection portion 38 has a rectangular shape when viewed from above, and is formed larger than the upper surface of the first terminal block 16. External connection is achieved by screwing a screw (not shown) into the nut 17 of the first terminal block 16 in a state where the external connection portion 38 and an external circuit terminal (not shown) are superposed on the upper surface of the first terminal block 16. The portion 38 and the external circuit terminal are electrically connected.
  • the first electrical connection portion 39 has a generally rectangular shape when viewed from the left.
  • the first electrical connection portion 39 is attached to the first power terminal 27 by screwing the screw 41 into the screw hole 29 of the first power terminal 27 in a state of being stacked on the first power terminal 27 from the left. Fixed. As a result, the first electrical connection section 39 and the relay 12 are electrically connected.
  • the first heat transfer connection portion 40 has a rectangular shape when viewed from above.
  • the outer shape of the first heat transfer connection portion 40 is formed to be slightly smaller than the inner surface of the first through hole 20. As a result, the first heat transfer connection portion 40 can be housed in the first through hole 20 from above.
  • Second bus bar 35 As shown in FIGS. 1 and 2, the second bus bar 35 extends in the up-down direction and the left-right direction, but the fuse connection portion 42 and the second electrical connection portion that is bent and extends rearward from the left end portion of the fuse connection portion 42. 43 (an example of an electrical connection part), and a second heat transfer connection part 44 (an example of a heat transfer connection part) that is bent and extends leftward from the lower end of the second electrical connection part 43. ..
  • the fuse connecting portion 42 of the second bus bar 35 has a vertically elongated rectangular shape when viewed from the front-rear direction.
  • the fuse connecting portion 42 is fixed to the front side surface of the second terminal block 18 on the left side by a screw 41 while being overlapped with the lead terminal 36 protruding leftward from the fuse 13. As a result, the second bus bar 35 and the fuse 13 are electrically connected.
  • the second electrical connection portion 43 has a substantially rectangular shape when viewed from the left and right direction.
  • the second electrical connection portion 43 is attached to the second power terminal 28 by screwing the screw 41 into the screw hole 29 of the second power terminal 28 in a state of being stacked on the second power terminal 28 from the left. Fixed. As a result, the second electrical connection portion 43 and the relay 12 are electrically connected.
  • the second heat transfer connecting portion 44 has a rectangular front left corner cut out when viewed from above.
  • the outer shape of the second heat conductive connection portion 44 is formed to be slightly smaller than the inner surface of the second through hole 21. As a result, the second heat transfer connection portion 44 can be housed in the second through hole 21 from above.
  • the third bus bar 45 As shown in FIGS. 1 and 2, the first terminal block 16 provided on the right side of the base member 11 and the second terminal block 18 provided on the right side of the base member 11 are electrically connected by the third bus bar 45. It is connected to the.
  • the third bus bar 45 is made of a metal plate material that is bent in an L shape when viewed in the left-right direction.
  • a metal forming the third bus bar 45 a metal having high thermal conductivity and low electric resistance, such as copper, copper alloy, aluminum, or aluminum alloy, can be appropriately selected.
  • the third bus bar 45 extends rearward from the upper end of the fuse connecting portion 46 and the fuse connecting portion 46 arranged along the front side surface of the second terminal block 18, and extends along the upper surface of the first terminal block 16. And an external connection portion 47 arranged.
  • the external connection part 47 has a rectangular shape when viewed from above.
  • the external connection part 47 is screwed onto the nut 17 of the first terminal block 16 with a screw (not shown) on the upper surface of the first terminal block 16 provided on the right side of the base member 11 in a state of being overlapped with an external circuit terminal (not shown). When combined, they are electrically connected to the external circuit terminal.
  • the fuse connecting portion 46 of the third bus bar 45 has a screw on the front side surface of the second terminal block 18 provided on the right side of the base member 11 in a state of being overlapped with the lead terminal 36 protruding rightward from the fuse 13.
  • the second terminal block 18 is fixed by being screwed into the nut 19 of the second terminal block 18. As a result, the third bus bar 45 and the fuse 13 are electrically connected.
  • an upper first heat transfer sheet 48 (an example of a heat transfer sheet) is laminated below the first heat transfer connection portion 40.
  • the upper first heat transfer sheet 48 has a flat sheet shape in the vertical direction, and is made of synthetic resin having a thermal conductivity higher than that of air.
  • the shape of the upper first heat transfer sheet 48 is set to be substantially the same as the shape of the first heat transfer connection part 40.
  • the upper first heat transfer sheet 48 is elastically deformable, and its thickness can be changed according to the force applied in the vertical direction.
  • an upper second heat transfer sheet 49 (an example of a heat transfer sheet) is laminated below the second heat transfer connection portion 44.
  • the shape of the upper second heat transfer sheet 49 is set to be substantially the same as the shape of the second heat transfer connection portion 44.
  • the upper second heat transfer sheet 49 has a flat sheet shape in the vertical direction, and is made of synthetic resin having a thermal conductivity higher than that of air.
  • the upper second heat transfer sheet 49 is elastically deformable, and its thickness can be changed according to the force applied in the vertical direction.
  • the thickness dimension of the upper first heat transfer sheet 48 and the thickness dimension of the upper second heat transfer sheet 49 are set to be substantially the same.
  • the term “substantially the same” includes the same case, and includes the case where they are not the same and are considered to be substantially the same.
  • Insulating plate 50 As shown in FIG. 5, an insulating plate 50 made of an insulating synthetic resin is arranged below the base member 11.
  • the outer shape of the insulating plate 50 substantially follows the outer shape of the base member 11.
  • the four corners of the insulating plate 50 are notched in order to avoid interference with the collar 14.
  • the insulating plate 50 is formed with through holes 51 penetrating vertically at positions corresponding to the recesses 24 of the base member 11.
  • a fuse through hole 52 is formed in the insulating plate 50 at a position corresponding to the fuse mounting hole 22 of the base member 11 so as to vertically penetrate therethrough.
  • the inner shape of the fuse through hole 52 is slightly larger than the outer shape of the fuse 13.
  • Lower first heat transfer sheet 53 and lower second heat transfer sheet 54 As shown in FIG. 1, a lower first heat transfer sheet 53 (an example of the heat transfer sheet) is laminated on the lower surface of the insulating plate 50 at a position corresponding to the upper first heat transfer sheet 48, and the upper first heat transfer sheet 53 is stacked.
  • the second lower heat transfer sheet 54 (an example of the heat transfer sheet) is laminated at a position corresponding to the second heat transfer sheet 49.
  • the lower first heat transfer sheet 53 is made of the same material as the upper first heat transfer sheet 48 and has the same shape.
  • the lower second heat transfer sheet 54 is made of the same material as the upper second heat transfer sheet 49 and has the same shape.
  • Heat dissipation member 55 As shown in FIG. 1, a heat dissipation member 55 made of metal is disposed below the insulating plate 50. As the metal forming the heat dissipation member 55, any metal such as aluminum, aluminum alloy, and stainless can be selected as necessary. In this embodiment, the heat dissipation member 55 is made of aluminum or an aluminum alloy. The heat dissipation member 55 can be formed into a predetermined shape by a known method such as casting, cutting, and pressing. The outer shape of the heat dissipation member 55 is formed to be substantially the same as the outer shape of the base member 11, and has a shape in which the left front corner is cut out of the rectangular shape.
  • Screw holes 56 are formed at the four corners of the heat dissipation member 55 so as to penetrate in the vertical direction, and the bolts 15 are screwed into the screw holes 56. By screwing the bolt 15 into the screw hole 56, the base member 11 and the heat dissipation member 55 are integrally fixed.
  • First pedestal 57 As shown in FIGS. 1 and 5, on the upper surface of the heat dissipation member 55, the first pedestal portion 57 on which the lower first heat transfer sheet 53 is placed is located below the lower first heat transfer sheet 53. (One example of the pedestal portion) is formed so as to project upward. When viewed from above, the shape of the first pedestal portion 57 is formed to be substantially the same as the outer shape of the lower first heat transfer sheet 53. The term “substantially the same” includes the case where the shape of the first pedestal portion 57 and the shape of the lower first heat transfer sheet 53 are the same, and includes the case where they are substantially the same even when they are not the same.
  • Second pedestal portion 58 As shown in FIG. 1, on the upper surface of the heat dissipation member 55, a second pedestal portion 58 on which the lower second heat transfer sheet 54 is placed is provided above the lower second heat transfer sheet 54. Is formed so as to protrude. When viewed from above, the shape of the second pedestal portion 58 is formed to be substantially the same as the outer shape of the lower second heat transfer sheet 54. “Substantially the same” includes the case where the shape of the second pedestal portion 58 and the shape of the lower second heat transfer sheet 54 are the same, and includes the case where they are substantially the same even when they are not the same.
  • the base member 11 is formed into a predetermined shape by injection molding a synthetic resin material.
  • the nut 17, the collar 14 and the like are attached to the base member 11.
  • the fuse 13 and the relay 12 are mounted on the base member 11 from above.
  • the relay 12 is fixed to the base member 11 with the screw 32.
  • the first bus bar 33, the second bus bar 35, and the third bus bar 45 are assembled at predetermined positions of the base member 11 from above.
  • the fuse 13, the first bus bar 33, the second bus bar 35, and the third bus bar 45 are fixed to the base member 11 and the relay 12 with the screws 41.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are cut into a predetermined shape by a known method such as Thomson type.
  • the insulating plate 50 is formed into a predetermined shape by injection molding a synthetic resin material.
  • the heat dissipation member 55 is formed by forming aluminum or an aluminum alloy into a predetermined shape by a known method such as aluminum die casting.
  • the lower first heat transfer sheet 53 is placed on the upper surface of the first pedestal portion 57 of the heat dissipation member 55, and the lower second heat transfer sheet 54 is placed on the upper surface of the second pedestal portion 58.
  • the insulating plate 50 is superposed on the heat dissipation member 55 on which the lower first heat transfer sheet 53 and the lower second heat transfer sheet 54 are placed.
  • the upper first heat transfer sheet 48 and the upper second heat transfer sheet 49 are stacked on the upper surface of the insulating plate 50. Then, the base member 11 is stacked on the insulating plate 50. At this time, the first heat transfer connecting portion 40 is overlapped on the upper first heat transfer sheet 48, and the second heat transfer connecting portion 44 is overlapped on the upper second heat transfer sheet 49.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 49 In a state before the bolt 15 is screwed into the screw hole 29 of the heat dissipation member 55, the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 49.
  • the heat transfer sheet 54 is in a natural state (see FIG. 4).
  • FIGS. 5 and 6 the bolt 15 is screwed into the screw hole 29 of the heat dissipation member 55.
  • the base member 11 is fixed to the heat dissipation member 55.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 receive a force in the vertical compression direction.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are elastically deformed in the vertical direction.
  • FIG. 5 shows the upper first heat transfer sheet 48 compressed in the vertical direction and the lower first heat transfer sheet 53 in a natural state.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are vertically moved. Compressed in direction.
  • the upper first heat transfer sheet 48 is in close contact with the first heat transfer connecting portion 40 and the insulating plate 50
  • the upper second heat transfer sheet 49 is in close contact with the second heat transfer connecting portion 44 and the insulating plate 50.
  • the lower first heat transfer sheet 53 is in close contact with the insulating plate 50 and the first pedestal portion 57
  • the lower second heat transfer sheet 54 is in close contact with the insulating plate 50 and the second pedestal portion 58.
  • the relay 12 and the heat dissipation member 55 form the first bus bar 33, the second bus bar 35, the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the insulating plate 50, and the lower first heat transfer sheet. 53 and the second lower heat transfer sheet 54, so that they are thermally connected to each other (see FIG. 6).
  • the circuit structure 10 is completed as described above.
  • the heat generated at the contact portion of the relay 12 when energized is transferred to the first power terminal 27 and the second power terminal 28.
  • the heat that reaches the first power terminal 27 is transferred to the first electrical connection portion 39 of the first bus bar 33, and the heat is conducted inside the first bus bar 33 to the first heat transfer connection portion 40.
  • the heat reaching the first heat transfer connection portion 40 is transferred to the insulating plate 50 via the upper first heat transfer sheet 48, and further to the heat dissipation member 55 via the lower first heat transfer sheet 53. Heat is transferred.
  • the heat reaching the second power terminal 28 also has the second electric connection portion 43, the second heat transfer connection portion 44, the upper second heat transfer sheet 49, the insulating plate 50, and the lower side heat transfer portion of the second bus bar 35. 2 Heat is transferred to the heat transfer sheet 54 and the heat dissipation member 55. Thereby, the heat generated in the relay 12 efficiently moves to the heat dissipation member 55 and is dissipated to the outside from the heat dissipation member 55. As a result, the heat dissipation of the circuit structure 10 is improved.
  • first bus bar 33 and the second bus bar 35 electrically connected to the relay 12 and the metal heat dissipation member 55 include an insulating upper first heat transfer sheet 48 and an upper second heat transfer sheet 49.
  • the insulating plate 50 and the lower first heat transfer sheet 53 and the lower second heat transfer sheet 54 ensure electrical insulation. As a result, the heat dissipation of the circuit structure 10 can be improved while maintaining the electrical insulation.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are made of elastically deformable material. Become.
  • the first bus bar 33 and the second bus bar 35, the insulating plate 50, and the heat dissipation member 55 expand due to the heat generated from the relay 12. Since the coefficient of thermal expansion of the metal and the coefficient of thermal expansion of the insulating material are different, a gap may occur between the first bus bar 33 and the second bus bar 35, the insulating plate 50, and the heat dissipation member 55. .. Since the thermal conductivity of air is very low, it is feared that the heat dissipation of the circuit structure 10 will be reduced if a gap is generated. According to the above configuration, the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are elastically deformed or restored.
  • At least the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are interposed, the first bus bar 33 and the second bus bar. It is possible to prevent a gap from being formed between the insulating layer 50, the insulating plate 50, and the heat dissipation member 55. Thereby, the heat dissipation of the circuit structure 10 can be improved.
  • the switching sound generated at the contact part is generated by the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower side.
  • the second heat transfer sheet 54 can be absorbed by elastically deforming. Thereby, the quietness of the circuit structure 10 can be improved.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are elastically deformed to be transferred from the vehicle to the relay 12. Vibrations can be absorbed. Since the relay 12 for electric power connected to the power supply of the vehicle is relatively large, the technique described in the present specification is particularly effective.
  • the upper first heat transfer sheet 48, the upper second heat transfer sheet 49, the lower first heat transfer sheet 53, and the lower second heat transfer sheet 54 are elastically deformed or restored, so that the base member 11, The tolerance of the insulating plate 50 and the heat dissipation member 55 can be accommodated.
  • the heat dissipation member 55 has the first pedestal portion 57 and the second pedestal portion 58 projecting toward the insulating plate 50 at a position corresponding to the insulating plate 50.
  • the insulating plate 50 can be pressed toward the first heat transfer connecting portion 40 by the first pedestal portion 57, and the second heat transfer connecting portion 44 can be pressed by the second pedestal portion 58. Can be pressed towards. Accordingly, it is possible to suppress the formation of a gap between the insulating plate 50 and the first heat transfer connection part 40 and the second heat transfer connection part 44. Thereby, the heat dissipation of the circuit structure 10 can be improved.
  • the insulating plate 50 is made of an insulating synthetic resin material.
  • the shape of the insulating plate 50 can be easily formed so as to correspond to the shapes of the first heat transfer connecting portion 40 and the second heat transfer connecting portion 44. As a result, heat can be efficiently transferred from the first heat transfer connection part 40 and the second heat transfer connection part 44 to the insulating plate 50, so that the heat dissipation of the circuit structure 10 can be improved. ..
  • the heat transfer sheet may be provided only between the heat transfer connection portion and the insulating plate, or may be provided only between the insulating plate and the heat dissipation member.
  • the pedestal portion is formed on the heat dissipation member, but the present invention is not limited to this, and the pedestal portion may be omitted.
  • the portion of the heat dissipation member on which the heat transfer sheet is placed may be depressed.
  • the bus bar is connected to the power terminal of the relay, but the configuration is not limited to this, and the bus bar may be connected to the coil terminal of the relay.
  • the heat transfer sheet may or may not have adhesiveness.
  • the heat transfer sheet has adhesiveness, it is possible to further improve the adhesion between the bus bar and the insulating plate or the adhesion between the insulating plate and the heat dissipation member.
  • the shape of the heat dissipation member is not limited to a plate shape, and may be, for example, a box shape that opens upward and can accommodate the base member. Further, the heat dissipation member may be a bracket for attaching the circuit structure to another member.
  • the heat-generating component is not limited to a mechanical relay, but may be a semiconductor relay, a capacitor, a diode, or any other electronic component.
  • the shape of the heat transfer connection portion provided on the bus bar may be any shape as required.
  • the shape of the heat transfer sheet is arbitrary and may be the same as or different from the shape of the heat transfer connection.
  • the shape of the pedestal provided on the heat dissipation member is arbitrary and may be the same as or different from the shape of the heat transfer sheet.
  • Circuit structure 11 Base member 11A: Upper surface 11B: Lower surface 12: Relay (an example of a heat-generating component) 20: 1st through-hole 21: 2nd through-hole 23: Relay mounting part 27: 1st power terminal 28: 2nd power terminal 33: 1st bus bar 35: 2nd bus bar 39: 1st electrical connection part 40: 1st 1 Heat Transfer Connection 43: Second Electric Connection 44: Second Heat Transfer 48: Upper First Heat Transfer Sheet 49: Upper Second Heat Transfer Sheet 50: Insulation Plate 53: Lower First Transfer Heat sheet 54: Lower second heat transfer sheet 55: Heat dissipation member 57: First pedestal portion 58: Second pedestal portion

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Thermal Sciences (AREA)
  • Connection Or Junction Boxes (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

Cette structure de circuit (10) est pourvue : d'un relais (12) ; d'une première barre omnibus (33) et d'une seconde barre omnibus (35), qui sont connectées au relais (12) ; d'un élément de base (11) ; d'une première feuille de transfert de chaleur supérieure (48) qui est en contact avec la première barre omnibus (33) de façon à transférer la chaleur ; d'une seconde feuille de transfert de chaleur supérieure (49) qui est en contact avec la seconde barre omnibus de façon à transférer la chaleur ; d'une plaque isolante (50) qui est superposée sur la première feuille de transfert de chaleur supérieure (48) et la seconde feuille de transfert de chaleur supérieure (49) ; d'une première feuille de transfert de chaleur inférieure (53) et d'une seconde feuille de transfert de chaleur inférieure (54), qui sont en contact avec la plaque isolante (50) de façon à transférer la chaleur ; et d'un élément de dissipation de chaleur (55) qui est superposé sur la première feuille de transfert de chaleur inférieure (53) et la seconde feuille de transfert de chaleur inférieure (54).
PCT/JP2019/042820 2018-11-21 2019-10-31 Structure de circuit WO2020105391A1 (fr)

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Cited By (1)

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WO2022172753A1 (fr) * 2021-02-12 2022-08-18 住友電装株式会社 Boîte de jonction électrique

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Publication number Priority date Publication date Assignee Title
JP7052689B2 (ja) * 2018-11-21 2022-04-12 株式会社オートネットワーク技術研究所 回路構成体
WO2024100750A1 (fr) * 2022-11-08 2024-05-16 株式会社オートネットワーク技術研究所 Dispositif de surveillance de température

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JP2013089768A (ja) * 2011-10-18 2013-05-13 Nissan Motor Co Ltd 半導体モジュール
JP2015223044A (ja) * 2014-05-23 2015-12-10 株式会社オートネットワーク技術研究所 回路構成体および電気接続箱
JP2016025673A (ja) * 2014-07-16 2016-02-08 株式会社オートネットワーク技術研究所 電気接続箱
JP2016105678A (ja) * 2014-12-01 2016-06-09 株式会社オートネットワーク技術研究所 回路構成体
JP2018093713A (ja) * 2016-12-05 2018-06-14 トヨタ自動車株式会社 リレーユニット

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JP2013089768A (ja) * 2011-10-18 2013-05-13 Nissan Motor Co Ltd 半導体モジュール
JP2015223044A (ja) * 2014-05-23 2015-12-10 株式会社オートネットワーク技術研究所 回路構成体および電気接続箱
JP2016025673A (ja) * 2014-07-16 2016-02-08 株式会社オートネットワーク技術研究所 電気接続箱
JP2016105678A (ja) * 2014-12-01 2016-06-09 株式会社オートネットワーク技術研究所 回路構成体
JP2018093713A (ja) * 2016-12-05 2018-06-14 トヨタ自動車株式会社 リレーユニット

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022172753A1 (fr) * 2021-02-12 2022-08-18 住友電装株式会社 Boîte de jonction électrique

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