WO2023238758A1 - 回路構成体 - Google Patents

回路構成体 Download PDF

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Publication number
WO2023238758A1
WO2023238758A1 PCT/JP2023/020404 JP2023020404W WO2023238758A1 WO 2023238758 A1 WO2023238758 A1 WO 2023238758A1 JP 2023020404 W JP2023020404 W JP 2023020404W WO 2023238758 A1 WO2023238758 A1 WO 2023238758A1
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WO
WIPO (PCT)
Prior art keywords
case
bus bar
lower case
upper case
conductive member
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/020404
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
昂士 井倉
洋樹 下田
泰次 柳田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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 Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to CN202380044641.4A priority Critical patent/CN119234473A/zh
Priority to US18/871,635 priority patent/US20260006728A1/en
Publication of WO2023238758A1 publication Critical patent/WO2023238758A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/16—Distribution boxes; Connection or junction boxes structurally associated with support for line-connecting terminals within the box
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00—Installations of bus-bars
    • H02G5/06—Totally-enclosed installations, e.g. in metal casings

Definitions

  • the present disclosure relates to a circuit structure including a heat generating component.
  • Patent Document 1 a first bus bar connected to an output terminal of a battery, a second bus bar connected to an input terminal of a load, and a relay connected between the first and second bus bars are housed in a case.
  • a circuit structure is disclosed.
  • the bus bar connected to the relay is pressed against the case via a sheet-like heat conductive member, and the heat from the relay is transferred to the case.
  • a structure that transfers heat is adopted.
  • a circuit structure that can reduce the stress generated at the interface between the heat conductive member and the case.
  • the circuit structure of the present disclosure includes a heat generating component, a bus bar connected to a connection portion of the heat generating component, a case accommodating the heat generating component and the bus bar, and a circuit structure placed on a mounting surface of the case, the a case and a heat conductive member that is in thermal contact with the bus bar and held between them; the case engages with the heat conductive member to regulate displacement of the heat conductive member; It has a displacement regulating part.
  • FIG. 1 is a perspective view showing a circuit structure according to a first embodiment.
  • FIG. 2 is a plan view of the circuit structure shown in FIG.
  • FIG. 3 is a longitudinal sectional view showing an enlarged cross section taken along line III--III in FIG.
  • FIG. 4 is an exploded perspective view of the circuit structure shown in FIG. 1.
  • 5 is a perspective view from the bottom side of the upper case that constitutes the circuit structure shown in FIG. 1.
  • FIG. FIG. 6 is a perspective view of the lower case that constitutes the circuit structure shown in FIG. 1.
  • FIG. FIG. 7 is a longitudinal sectional view showing the circuit structure according to the second embodiment, and corresponds to FIG. 3.
  • FIG. 8 is a perspective view from the bottom side of the upper case that constitutes the circuit structure shown in FIG. 7.
  • FIG. 8 is a perspective view from the bottom side of the upper case that constitutes the circuit structure shown in FIG. 7.
  • FIG. 9 is a perspective view of the lower case that constitutes the circuit structure shown in FIG. 7.
  • FIG. FIG. 10 is a longitudinal cross-sectional view showing a circuit configuration according to the third embodiment, and is a cross-sectional view corresponding to the XX cross-sectional line in FIG.
  • FIG. 11 is a perspective view from the bottom side of the upper case that constitutes the circuit structure shown in FIG. 10.
  • FIG. 12 is a perspective view of the lower case that constitutes the circuit structure shown in FIG. 10.
  • the circuit structure of the present disclosure includes a heat generating component, a bus bar connected to a connection portion of the heat generating component, a case accommodating the heat generating component and the bus bar, and a circuit structure placed on a mounting surface of the case, the a case and a heat conductive member that is in thermal contact with the bus bar and held between them; the case engages with the heat conductive member to regulate displacement of the heat conductive member; It has a displacement regulating part.
  • the case housing the heat-generating component and the bus bar connected to the connecting portion of the heat-generating component is connected to the heat conductive member that is in thermal contact with the case and the bus bar and is sandwiched between them. It has an engaging displacement regulating part.
  • the displacement regulating portion can engage with the heat conductive member to regulate displacement of the heat conductive member. Therefore, displacement of the thermally conductive member relative to the case is advantageously suppressed or prevented, and stress occurring at the interface between the case and the thermally conductive member can be advantageously reduced or eliminated.
  • the displacement of the heat conductive member with respect to the case may be suppressed or prevented in at least one direction among the front-rear direction, left-right direction, and up-down direction in the embodiment described later.
  • bus bar connected to the connection part of the heat generating component may constitute a current conducting path, or may be used as a metal for heat dissipation without being electrically connected to other components. good.
  • the displacement regulating part has a protrusion that protrudes from the mounting surface of the case, the heat conductive member has a through hole through which the protrusion is inserted, and the bus bar has a through hole that protrudes from the mounting surface of the case. It is preferable that the protrusion has a through hole which is overlapped with the protrusion and through which the protrusion is inserted. Since the protrusion protruding from the mounting surface of the case is inserted through the through hole of the heat conduction member, stress generated at the interface between the case and the heat conduction member can be advantageously reduced.
  • the heat conductive member and the bus bar have different coefficients of linear expansion in one case and in the other case. Even when the heat conduction member is held in a case, it is possible to suppress the transmission of displacement force applied to the heat conduction member via the bus bar, and the stress generated at the interface between the case and the heat conduction member can be advantageously reduced. .
  • the case includes a lower case having the mounting surface, and an upper case assembled with the lower case with the thermally conductive member and the bus bar sandwiched therebetween, and the upper case has a locked portion.
  • the protruding portion includes a locking portion provided on the lower case and lockingly fitted to the locked portion.
  • the case includes a lower case having a mounting surface, and an upper case assembled with a heat conductive member and a bus bar sandwiched between the lower case and a locking part that realizes a locking fit between the lower case and the upper case. Since the protrusion is configured by utilizing the above, the protrusion can be efficiently provided.
  • the locking part that constitutes the protruding part is provided on the mounting surface on which the heat conductive member is placed, the mating force between the lower case and the upper case is applied directly to the overlapping portion of the heat conductive member and the bus bar.
  • the displacement of the heat conductive member relative to the case can be further advantageously suppressed.
  • the relative displacement of both cases in the vicinity of the thermally conductive member is further advantageously suppressed, and the stress generated at the interface between the case and the thermally conductive member is advantageously reduced. can.
  • the pressing force of the heat conductive member against the case due to locking of the upper case and lower case can be adjusted.
  • the pressing force can be adjusted according to the material, elastic properties, etc. of the conductive member.
  • the upper case has a positioning rib that positions the bus bar, and the bus bar is positioned by engagement with the positioning rib, and the locked portion of the upper case is connected to the through hole of the bus bar and the heat exchanger. It is preferable that the lock portion be positioned in the through hole of the conductive member, the through hole, and the lock portion inserted through the through hole.
  • the lower case and the upper case each have a guide part and a guided part arranged on the outer peripheral side of the lock part and the locked part, and when the upper case is assembled to the lower case, Preferably, the guided portion is guided by the guide portion in advance so that the locked portion of the upper case is positioned at the lock portion of the lower case.
  • the guide part and the guided part are guided in advance on the outer peripheral sides of the locking part and the locked part, and the locking part and the locked part are positioned, so that the assembly work of the lower case and the upper case is easy. It is possible to further improve sexual performance.
  • the case includes a lower case having the mounting surface, and an upper case assembled with the lower case while sandwiching the heat conductive member and the bus bar, and the upper case has a press fit hole.
  • the protruding portion includes a press-fitting protrusion that is provided on the lower case and press-fitted into the press-fitted hole.
  • the case has a lower case that has a mounting surface and an upper case that is assembled by sandwiching a heat conductive member and a bus bar between the lower case and a press-fit protrusion that realizes the assembly by press-fitting the lower case and the upper case. Since the protrusion is configured by utilizing the above, the protrusion can be efficiently provided.
  • the press-fitting protrusion that constitutes the protrusion is provided on the mounting surface on which the heat conduction member is placed, the assembly force of the lower case and upper case is applied to the overlapping portion of the heat conduction member and the bus bar.
  • the thermal conduction member can be directly affected, and the displacement of the heat conductive member relative to the case can be suppressed more advantageously.
  • the displacement regulating portion has an elastic locking piece that protrudes from the periphery of the mounting surface of the case, and the elastic locking piece includes a flexible piece that can be elastically deformed on the outer peripheral side of the heat conductive member, and It is preferable that the bus bar has a lock claw portion provided at a protruding end portion of the piece, and the lock claw portion engages with an edge of the bus bar superimposed on the heat conductive member.
  • An elastic locking piece is provided that protrudes from the periphery of the mounting surface, and the locking claw of the elastic locking piece engages the edge of the bus bar superimposed on the heat conducting member, thereby suppressing displacement of the heat conducting member with respect to the case. can do.
  • the upper case has a pressing part that brings the bus bar into contact with the heat conductive member, and that the pressing part is provided with the locked part.
  • the upper case is provided with a pressing portion that brings the bus bar into contact with the heat conductive member, and the pressing portion is provided with a locked portion.
  • Embodiment 1 of the present disclosure will be described below with reference to FIGS. 1 to 6.
  • the circuit structure 10 of the first embodiment is mounted on 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. supply and control.
  • a power source not shown
  • a load not shown
  • the circuit structure 10 can be arranged in any direction, in the following, the upper side means the upper side in FIG. 3, the lower side means the lower side in FIG. 3, the front means the lower side in FIG. 2, and the rear means the lower side in FIG.
  • the upper and left side in FIG. 2 will be explained as the left side in FIG. 2, and the right side will be explained as the right side in FIG. 2.
  • a plurality of identical members only some of the members may be labeled with numerals, and the numerals may be omitted for other members.
  • the circuit component 10 includes a relay 12 and a fuse 14 as heat-generating components that generate heat when energized, a bus bar 18 connected to a connecting portion 16 of the heat-generating components (the relay 12 and the fuse 14), and a bus bar 18 that is connected to a connecting portion 16 of the heat-generating components (the relay 12 and the fuse 14 ) and a case 20 that accommodates the bus bar 18, and a case 20 that is placed on a mounting surface 22 (first to third mounting surfaces 22a to 22c described later) of the case 20 and is in thermal contact with the case 20 and the bus bar 18.
  • the heat conductive sheet 24 (first to third heat conductive sheets 24a to 24c to be described later) as a heat conductive member is sandwiched therebetween.
  • the relay 12 includes a relay body 26 in the shape of a hollow rectangular parallelepiped.
  • a pair of connecting portions 16, 16 (a first connecting portion 16a and a second connecting portion 16b) are provided on the front surface of the relay body 26 and are spaced apart from each other in the left-right direction.
  • An insulating plate 28 projecting forward is provided between the first connecting portion 16a and the second connecting portion 16b.
  • the relay main body 26 is provided with a plurality of leg portions 30 that protrude outward in the left-right direction.
  • bolt insertion holes are formed in these leg portions 30 in the vertical direction, and the relay 12 is connected to an upper case 58 that constitutes the case 20 by the bolts inserted into these bolt insertion holes. It is now fixed to .
  • the fuse 14 includes a fuse body 32 having a substantially rectangular parallelepiped shape.
  • the fuse body 32 is provided with metal connecting portions 16, 16 (a third connecting portion 16c and a fourth connecting portion 16d) that protrude on both sides in the left-right direction.
  • These third and fourth connecting portions 16c and 16d are formed with bolt insertion holes 34 that pass through them in the vertical direction, and the fuse 14 is inserted into the case 20 by the bolts 36 that are inserted into each of these bolt insertion holes 34. It is fixed to an upper case 58 which will be described later.
  • the bus bar 18 is formed by bending a metal plate material into a predetermined shape by press working or the like.
  • the material of the bus bar 18 is not limited, but copper, copper alloy, aluminum, aluminum alloy, etc. are preferably used.
  • three bus bars 18 are provided spaced apart from each other in the left and right direction, and in order from the left, a first bus bar 18a, a second bus bar 18b, and a third bus bar 18c. It is. Note that in FIGS. 5 and 6, first to third bus bars 18a, 18b, and 18c, which are fixed to an upper case 58 and a lower case 60, which will be described later, are indicated by two-dot chain lines, respectively.
  • the first bus bar 18a extends in the left-right direction as a whole.
  • the first bus bar 18a includes a substantially rectangular relay connection portion 38 (first relay connection portion 38a) that extends in the vertical direction at the right end portion.
  • a substantially rectangular heat transfer section 40 (first heat transfer section 40a) extending in the horizontal direction (direction orthogonal to the vertical direction) extends rearward from the lower end of the first relay connection section 38a.
  • the first bus bar 18a includes a left external connection portion 42 having a substantially rectangular shape extending in the horizontal direction at the left end portion.
  • the left external connection part 42 is located above the first heat transfer part 40a, and the left external connection part 42 and the first heat transfer part 40a are bent in a crank shape at the middle part in the left-right direction. It is connected.
  • a bolt insertion hole 44 penetrating in the thickness direction (front-back direction) is formed in the first relay connection portion 38a.
  • the bolt insertion hole 44 has an elongated oval shape in the vertical direction.
  • the vertical position of the first bus bar 18a with respect to the relay 12 can be adjusted when the relay 12 and the first bus bar 18a are bolted together, which will be described later.
  • the first heat transfer part 40a is brought into more reliable thermal contact with the lower case 60, which will be described later, via the heat conductive sheet 24 (first heat conductive sheet 24a). be able to.
  • a bolt insertion hole 46 is formed in the left external connection portion 42 and penetrates in the thickness direction (vertical direction).
  • the second bus bar 18b extends in the left-right direction as a whole.
  • a substantially rectangular relay connection portion 38 (second relay connection portion 38b) that extends in the vertical direction is provided at the left end of the second bus bar 18b.
  • a circular bolt insertion hole 44 is formed.
  • a substantially rectangular heat transfer section 40 (second heat transfer section 40b) extending in the horizontal direction is connected to the lower end of the second relay connection section 38b.
  • the second heat transfer portion 40b extends rearward from the lower end of the second relay connection portion 38b, and extends from the second relay connection portion 38b at the left end of the second bus bar 18b to the right portion of the second bus bar 18b. It extends from left to right.
  • the second bus bar 18b includes a substantially rectangular fuse connection portion 48 extending in the horizontal direction at the right end portion.
  • the fuse connection portion 48 is located above the second heat transfer portion 40b, and the fuse connection portion 48 and the second heat transfer portion 40b are connected by a portion that extends in the vertical direction.
  • a circular through hole 50 that penetrates in the thickness direction is provided at approximately the center in the front-rear direction of the second heat transfer portion 40b that extends in the left-right direction.
  • a pair of through holes 50, 50 are provided, and these pair of through holes 50, 50 are spaced apart from each other in the left and right direction.
  • the inner diameter of each of these through holes 50 is approximately equal to the maximum outer diameter of a portion where each fitting pawl 106 is formed at the upper end of each protrusion 100 of the lower case 60, which will be described later. It is made slightly smaller, and is approximately equal to or slightly larger than the outer diameter of the portion of each protrusion 100 where each fitting claw 106 is not formed.
  • each fitting claw 106 (each elastic piece 104) elastically deforms inward in the radial direction.
  • Each protrusion 100 can be inserted into the hole 50.
  • each fitting claw 106 (each elastic piece 104) is elastically deformed to restore its shape, so that each protrusion from each through hole 50 is inserted into the through hole 50. 100 omissions can be prevented.
  • a bolt insertion hole 52 is formed in the fuse connection portion 48 and extends through the fuse connection portion 48 in the thickness direction (vertical direction). That is, in the second bus bar 18b, each through hole 50 is provided relatively close to each bolt insertion hole 44, 52.
  • the third bus bar 18c extends in the left-right direction as a whole.
  • a substantially rectangular fuse connection part 48 that spreads horizontally is provided at the left end of the third bus bar 18c, and the fuse connection part 48 has a bolt insertion hole 52 that passes through the fuse connection part 48 in the thickness direction (vertical direction). is formed.
  • a right external connection part 54 having a substantially rectangular shape that spreads horizontally is provided at the right end of the third bus bar 18c.
  • a bolt insertion hole 56 is formed.
  • a substantially rectangular heat transfer portion 40 (third heat transfer portion 40c) is provided in the middle portion in the left-right direction. That is, the fuse connection part 48 located at the left end of the third bus bar 18c and the right external connection part 54 located at the right end are connected via the third heat transfer part 40c.
  • the third heat transfer portion 40c is located below the fuse connection portion 48 and the right external connection portion 54, and the third heat transfer portion 40c, the fuse connection portion 48, and the right external connection portion 54 are connected to each other. They are connected by vertically extending parts.
  • the case 20 has a box shape as a whole and is made of, for example, synthetic resin. As shown in FIG. 2, in the first embodiment, the case 20 has a substantially rectangular shape extending in the left-right direction in plan view.
  • the case 20 is composed of an upper case 58 located above and a lower case 60 located below, and these upper case 58 and lower case 60 can be assembled and separated in the vertical direction.
  • the material of the synthetic resin constituting the upper case 58 and the lower case 60 is not limited, but may contain filler such as glass fiber, for example.
  • the material of the upper case 58 and the material of the lower case 60 may be different.
  • the material of the lower case 60 preferably exhibits good thermal conductivity, and is preferably made of nylon-based synthetic resin, such as polyamide 6 (PA6). It's okay.
  • PA6 polyamide 6
  • the upper case 58 has a generally box-like shape that opens downward, and includes a substantially rectangular upper bottom wall 62 extending in the left-right direction and an upper peripheral wall 64 projecting downward from the outer peripheral edge of the upper bottom wall 62. ing. Further, substantially rectangular openings 66a and 66b are formed at both ends of the upper bottom wall 62 in the left-right direction, and penetrate in the vertical direction. Further, in the front portion of the upper peripheral wall 64, there are provided a thickness direction (front-back direction) at a position corresponding to each connection portion 16 (first and second connection portions 16a, 16b) of the relay 12 fixed to the upper case 58.
  • a notch 68 is provided that passes through the housing, and the pair of notches 68, 68 are spaced apart from each other in the left-right direction.
  • each connection portion 16 (first and second connection portions 16a, 16b) of the relay 12 fixed to the upper case 58 can be accessed from the front through each notch 68, which will be described later.
  • a bolt 120 can be fastened.
  • the upper case 58 is provided with a pressing portion 70 that brings the bus bar 18 into contact with the heat conductive sheet 24.
  • the pressing portion 70 has an approximately rectangular parallelepiped shape as a whole, and is provided to protrude downward from the upper bottom wall 62 in the internal space of the upper case 58 .
  • the pressing portion 70 is integrally formed with the upper base wall 62 at a middle portion of the upper base wall 62 in the left-right direction and has predetermined dimensions in the front-back direction and in the left-right direction.
  • the pressing portion 70 is formed with a dimension in the front-rear direction that is slightly larger than the dimension in the front-rear direction of the portion in which each through hole 50 is formed in the second heat transfer portion 40b of the second bus bar 18b. .
  • the pressing part 70 has a predetermined vertical dimension, and as described later, the bus bar 18 (second bus bar 18b) and the thermally conductive sheet 24 (second thermally conductive sheet 24b) are connected to the lower end of the pressing part 70. are superimposed, and the pressing part 70 is superimposed on a bottom wall 90 of the lower case 60, which will be described later, via the bus bar 18 (second bus bar 18b) and the heat conductive sheet 24 (second heat conductive sheet 24b). It has become.
  • the heat conductive sheet 24 (second heat conductive sheet 24b) and bus bar 18 (second bus bar 18b) sandwiched between the pressing part 70 and the bottom wall 90 in the vertical direction, the upper case 58 and the lower case 60 can be assembled together.
  • the pressing portion 70 has a plurality of substantially rectangular lightening holes 72 that open downward, and these plurality of lightening holes 72 are arranged in alignment in the front-rear direction and the left-right direction. As a result, the pressing portion 70 is formed in a substantially lattice shape when viewed from the bottom of the upper case 58. Further, the pressing portion 70 is formed with a locked portion 74 into which a locking portion 102 (described later) provided on the lower case 60 is lock-fitted. Specifically, the locked portion 74 is provided at the lower end portion of a cylindrical portion 76 that projects downward from the upper bottom wall 62.
  • the cylindrical portion 76 is provided in the hollow hole 72 in the central portion of the pressing portion 70 in the front-rear direction, and the pair of cylindrical portions 76, 76 are provided spaced apart from each other in the left-right direction. ing. That is, in the upper case 58, the pair of locked parts 74, 74 are provided spaced apart from each other in the left and right direction.
  • each cylindrical portion 76 mating claws 78 that protrude inward are provided on both sides in the front-rear direction.
  • a locked portion 74 is configured.
  • the lower end surfaces of the mating claws 78 that face each other in the front-rear direction are each formed into an inclined surface 80, and each of these inclined surfaces 80 is formed in a direction in which the distance between the opposing surfaces in the front-rear direction gradually increases as it goes downward. is inclined to.
  • positioning ribs 82 for positioning the bus bar 18 are provided at both ends of the pressing portion 70 in the front-rear direction. Each of these positioning ribs 82 is provided to protrude downward from both ends of the pressing portion 70 in the front and back direction.
  • positioning ribs 82, 82 having predetermined left-right dimensions are provided at both ends of the pressing portion 70 in the front-rear direction and at both ends in the left-right direction so as to be spaced apart from each other in the left-right direction.
  • the longitudinal separation dimension of the positioning ribs 82, 82 facing each other in the longitudinal direction is approximately equal to or slightly larger than the longitudinal dimension of the portion where each through hole 50 is formed in the second heat transfer portion 40b of the second bus bar 18b. ing. Thereby, when the second bus bar 18b is superimposed on the pressing portion 70, the second bus bar 18b is positioned between the positioning ribs 82, 82 which are spaced apart in the front-rear direction.
  • a guided portion 84 is provided on the inner circumferential surface of the upper circumferential wall 64 of the upper case 58, and a guided portion 84 is provided on the inner circumferential surface of the upper circumferential wall 64 of the upper case 58 to guide a guide portion 110, which will be described later, provided on the lower case 60 when the upper case 58 and the lower case 60 are assembled.
  • a plurality of guided portions 84 are provided at portions on both sides of the inner circumferential surface of the upper circumferential wall 64 in the front-rear direction so as to be spaced apart from each other in the left-right direction. That is, in the upper case 58, each guided portion 84 is provided on the outer peripheral side of each locked portion 74.
  • each guided portion 84 includes a guided portion main body 86 having a substantially rectangular parallelepiped shape, and is formed with predetermined left-right dimensions and front-back dimensions.
  • Each of the guided portion main bodies 86 extends in the vertical direction, which is the direction in which the upper case 58 and the lower case 60 are assembled, and each of the guided portion main bodies 86 protrudes downward from the upper bottom wall 62.
  • the vertical dimension of each guided part main body 86 is approximately equal to the vertical dimension of the upper peripheral wall 64, and the lower end of the guided part main body 86 and the lower end of the upper peripheral wall 64 are at approximately the same position in the vertical direction. .
  • Each of these guided portion main bodies 86 is located inward by a predetermined distance from the upper circumferential wall 64 (inward in the front-rear direction in the first embodiment), and the upper circumferential wall 64 and each guided portion main body 86 are located inwardly by a predetermined distance. They are connected by a connecting portion 88, respectively.
  • Each connecting portion 88 extends in the vertical direction and has a smaller vertical dimension than each guided portion main body 86 .
  • each connecting portion 88 has a smaller left-right dimension than each guided portion main body 86, and each connecting portion 88 connects to the upper peripheral wall 64 at the left-right center portion of each guided portion main body 86. It is connected to the guided portion main body 86.
  • the lower case 60 has a generally box-like shape that opens upward, and includes a substantially rectangular bottom wall 90 that extends in the left-right direction, and a bottom that projects upward from the outer peripheral edge of the bottom wall 90.
  • a surrounding wall 92 is provided.
  • substantially rectangular shapes are formed to support the left external connection portion 42 of the first bus bar 18a and the right external connection portion 54 of the third bus bar 18c, respectively, when the circuit component 10 is assembled.
  • Block-shaped support portions 94a and 94b are provided. As a result, when the circuit component 10 is assembled, the left and right external connection parts 42 and 54 supported on the support parts 94a and 94b are exposed upward through the opening parts 66a and 66b in the upper case 58.
  • nuts are provided in the support parts 94a, 94b in a substantially buried state, and nuts (not shown) are provided on both the support parts 94a, 94b at the left and right external connection parts 42, 54 and the terminals of the external electric wires.
  • the terminals are overlapped and the bolts are inserted into both the bolt insertion holes 46 and 56 and fastened to the nuts, the first and third bus bars 18a and 18c and the external electric wire are brought into electrical continuity. ing.
  • a substantially rectangular upper accommodation recess 96 that opens upward is provided at a position corresponding to the heat transfer portion 40 of the bus bar 18.
  • the first to third transmission lines of the first to third bus bars 18a to 18c are disposed on the upper surface of the bottom wall 90.
  • First to third upper housing recesses 96a to 96c are provided at positions corresponding to the heating portions 40a to 40c so as to be spaced apart from each other in the left and right direction.
  • each of the bottom surfaces of the third upper accommodation recesses 96a to 96c is a mounting surface 22 (first to third mounting surfaces 22a to 22c).
  • the first to third upper accommodation recesses 96a to 96c are not essential, and the heat conductive members (for example, the first to third heat conductive sheets 24a to 24c) are placed on the upper surface of the bottom wall.
  • the mounting surface may be constituted by the upper surface of the bottom wall.
  • substantially rectangular lower accommodation recesses 98 that open downward are provided at positions corresponding to the first to third upper accommodation recesses 96a to 96c. ing.
  • three lower housing recesses 98 are provided on the lower surface of the bottom wall 90 in correspondence with the first to third upper housing recesses 96a to 96c, and are spaced apart from each other in the left and right direction. In FIG. 3, only the lower housing recess 98 corresponding to the second upper housing recess 96b is shown.
  • the formation positions of the first to third upper accommodation recesses 96a to 96c and each lower accommodation recess 98 are changed.
  • the bottom wall 90 is thinner than other parts.
  • Each of these lower accommodation recesses 98 includes a heat conductive member (not shown) similar to the first to third heat conductive sheets 24a to 24c placed in the first to third upper accommodation recesses 96a to 96c, for example. ) is accommodated and fixed.
  • the bottom wall 90 is brought into thermal contact with a heat radiator (not shown) such as a vehicle body panel or a battery pack casing via the heat conductive member (thermal conductive sheet) accommodated in each lower accommodation recess 98. , the heat generated in the relay 12 and the fuse 14 is radiated through the heat radiator.
  • the mounting surface 22 of the lower case 60 is provided with a protrusion 100 that protrudes upward.
  • a pair of protrusions 100, 100 that protrude upward from the second mounting surface 22b are provided in the middle part in the left-right direction in the center part in the front-rear direction of the lower case 60. , 100 are provided spaced apart from each other in the left and right direction.
  • each protrusion 100 includes a locking portion 102 that locks into each locked portion 74 of the upper case 58 .
  • each protruding portion 100 has a substantially cylindrical shape that can be inserted into each cylindrical portion 76 of the upper case 58, and a plurality of notches spaced apart from each other in the circumferential direction are provided in the peripheral wall of the cylinder. It is being As a result, elastic pieces 104 that can be elastically deformed in the radial direction of each protrusion 100 are provided on both sides of each protrusion 100 having a substantially cylindrical shape in the front-rear direction. A fitting claw 106 that protrudes outward in the front-rear direction is provided at the upper end of each of these elastic pieces 104, and each lock portion 102 in each protrusion 100, including the elastic piece 104 having each fitting claw 106, It is configured.
  • each protrusion 100 elastic pieces 104 having respective fitting claws 106 are provided facing each other in the front-rear direction. Further, the upper end surface of each fitting claw 106 is each an inclined surface 108, and each inclined surface 108 is formed in a direction in which the outward protrusion dimension of each fitting claw 106 in the front-rear direction gradually increases as it goes downward. is inclined to.
  • a guide portion 110 is provided on the lower peripheral wall 92 of the lower case 60 at a position corresponding to the guided portion 84 of the upper case 58.
  • a plurality of guide portions 110 are provided in portions of the lower peripheral wall 92 on both sides in the front-rear direction so as to be spaced apart from each other in the left-right direction. That is, in the lower case 60, each guide portion 110 is provided on the outer peripheral side of each lock portion 102.
  • each guide portion 110 includes a pair of guide wall portions that protrude inward (inward in the front-rear direction in the first embodiment) on the inner circumferential surface of the lower circumferential wall 92. 112, 112.
  • Each of these guide wall portions 112 extends in the vertical direction, and the pair of guide wall portions 112, 112 in each guide portion 110 is approximately equal to or slightly smaller than the horizontal dimension of each guided portion main body 86 in the upper case 58. They are separated from each other by a large left-right dimension.
  • each guide portion 110 a cutout window 114 is provided in the center portion in the left-right direction between the pair of guide wall portions 112, 112, which opens upward in the lower peripheral wall 92 and penetrates in the front-rear direction.
  • Each cutout window 114 is formed with a dimension in the vertical direction that does not reach the entire length of the lower peripheral wall 92 in the vertical direction.
  • the widthwise dimension (in the first embodiment, the left-right dimension) of each cutout window 114 is approximately equal to or slightly larger than the left-right dimension of each connecting portion 88 in the upper case 58 .
  • each guided portion 84 in the upper case 58 and each guide portion 110 in the lower case 60 are shaped as described above, when the upper case 58 and the lower case 60 are assembled, the pair of guide wall portions 112, Each guided portion main body 86 is inserted between the left and right portions 112 , and each connecting portion 88 is inserted into each cutout window 114 . Thereby, when the upper case 58 and the lower case 60 are assembled, the guide portion 110 is guided in the vertical direction relative to the guided portion 84.
  • each guided part main body 86 is inserted into the pair of guide walls 112, 112 in a substantially press-fit state, and each connecting part 88 is inserted into each notch window 114 in a substantially press-fit state, It is also possible to assemble the upper case 58 and the lower case 60 in a mutually fixed state. That is, each guide portion 110 and each guided portion 84 may constitute a fixing mechanism for upper case 58 and lower case 60. Note that the fixing mechanism between the upper case 58 and the lower case 60 is provided separately from the fixing mechanism provided by each guide portion 110 and each guided portion 84, or in addition to the fixing mechanism provided by each guide portion 110 and each guided portion 84. It's okay. For example, as a mechanism for fixing the upper case 58 and the lower case 60, lock fitting between each lock portion 102 and each locked portion 74 may be employed.
  • thermo conductive sheet 24 When assembling the circuit component 10, a heat conductive sheet 24, which is a sheet-shaped heat conductive member, is provided between the heat transfer portion 40 of the bus bar 18 and the bottom wall 90 of the lower case 60.
  • the first to third upper accommodation recesses 96a to 96c in the bottom wall 90 of the lower case 60 are located at the positions corresponding to the first to third heat transfer parts 40a to 40c in the first to third bus bars 18a to 18c.
  • the first to third thermally conductive sheets 24a to 24c are housed in the first to third thermally conductive sheets 24a to 24c.
  • the first to third heat conductive sheets 24a to 24c may be fixed to the lower surfaces of the first to third heat transfer parts 40a to 40c, or the first to third heat conductive sheets 24a to 24c may be fixed to the lower surfaces of the first to third upper housing recesses 96a to 96c. It may be fixed to the first to third mounting surfaces 22a to 22c, or it may not be fixed to any of them.
  • each of the lower accommodation recesses 98 in the bottom wall 90 of the lower case 60 accommodates a heat conductive member (not shown), and is held between the bottom wall 90 and the heat sink in the vertical direction. It has become.
  • the first to third thermally conductive sheets 24a to 24c have a sheet shape that is flat in the vertical direction, and are made of synthetic resin having higher thermal conductivity than air. Specifically, silicone resins, non-silicone acrylic resins, ceramic resins, and the like can be used. More specifically, thermally conductive silicone rubber and the like can be mentioned.
  • the first to third thermally conductive sheets 24a to 24c have flexibility and elasticity, and can be elastically deformed so that the thickness dimension changes according to the force applied in the vertical direction.
  • sheet-like heat conductive members (for example, the first to third heat conductive sheets 24a to 24c) are employed as the heat conductive members provided on both the upper and lower surfaces of the bottom wall 90 of the lower case 60.
  • each heat conductive member is not limited to this embodiment, and a heat conductive member having an arbitrary shape can be adopted.
  • a heat conductive member for example, a heat dissipation gap filler or heat conductive grease made of silicone resin may be used.
  • the materials of the synthetic resin forming the case 20 (upper case 58 and lower case 60) and the synthetic resin forming the heat conductive members (first to third heat conductive sheets 24a to 24c) are not limited;
  • the lower case 60 is formed of a nylon-based synthetic resin (for example, PA6) and the first to third thermal conductive sheets 24a to 24c are formed of a silicone-based synthetic resin
  • the lower case 60 and the first to third thermally conductive sheets 24a to 24c are formed of a silicone-based synthetic resin. Since peeling easily occurs between the heat conductive sheets 24a to 24c, the effects of the present disclosure can be more effectively exhibited by employing these materials.
  • the first to third heat conductive sheets 24a to 24c are held in a compressed state between the first to third heat transfer parts 40a to 40c and the bottom wall 90 of the lower case 60 in the vertical direction.
  • the first to third heat conductive sheets 24a to 24c can come into contact with the first to third heat transfer parts 40a to 40c and the bottom wall 90 of the lower case 60 with a high degree of adhesion.
  • the first to third heat conductive sheets 24a to 24c can efficiently transfer heat from the first to third heat transfer parts 40a to 40c to the lower case 60.
  • each heat conductive member provided on the lower surface of the bottom wall 90 in the lower case 60 is preferably held in a compressed state between the bottom wall 90 and the heat radiator in the vertical direction. Thereby, each heat conductive member can contact the bottom wall 90 and the heat radiator with a high degree of adhesion, and it becomes possible to efficiently transfer heat from the lower case 60 to the heat radiator.
  • the heat conductive sheet 24 is provided with through holes 116 through which the respective protrusions 100 provided on the lower case 60 are inserted.
  • the pair of protrusions 100, 100 are provided on the second mounting surface 22b of the lower case 60
  • the second thermally conductive sheet 24b placed on the second mounting surface 22b a pair of through holes 116, 116 are provided.
  • These through holes 116 are provided at approximately the central portion of the second thermally conductive sheet 24b in the front-rear direction and are spaced apart from each other in the left-right direction.
  • each through hole 116 is approximately equal to the inner diameter of each through hole 50 provided in the second bus bar 18b. That is, the inner diameter of each through hole 116 is approximately equal to or slightly smaller than the maximum outer diameter of the portion where each fitting pawl 106 provided at the upper end portion of each protrusion 100 of the lower case 60 is formed.
  • the outer diameter of the protruding portion 100 is approximately equal to or slightly larger than the outer diameter of the portion where each fitting claw 106 is not formed.
  • each protrusion 100 in the lower case 60 is inserted into and engaged with each through hole 116 in the second thermally conductive sheet 24b, and the second thermally conductive sheet 24b is inserted into the second thermally conductive sheet 24b relative to the lower case 60. Displacement is regulated. Therefore, in the first embodiment, the displacement regulating section 118 that is provided in the case 20 and engages with the thermally conductive sheet 24 to regulate the displacement of the thermally conductive sheet 24 includes each of the protrusions 100 .
  • the upper case 58, lower case 60, relay 12, fuse 14, first to third bus bars 18a to 18c, bolts 36, first to third heat conductive sheets 24a to 24c, etc. are prepared.
  • the relay 12 is placed on the upper bottom wall 62 of the upper case 58 which has been turned upside down, and the relay 12 is bolted to the upper case 58 using bolts inserted through each leg portion 30.
  • the first and second bus bars 18a and 18b are placed from above the relay 12, and the bolt insertion holes of the first and second connection parts 16a and 16b of the relay 12 and the first and second bus bars 18a and 18b are placed. 44 in the front-back direction.
  • the second heat transfer portion 40b of the second bus bar 18b is overlapped with the pressing portion 70 of the upper case 58 from above, so that the pressing portion
  • the second bus bar 18b is positioned with respect to the upper case 58 in the front-rear direction by each positioning rib 82 provided on the upper case 70.
  • bolts 120 are inserted from the front into these first and second connecting portions 16a, 16b and each bolt insertion hole 44 and fastened. This fixes the relay 12 and the first and second bus bars 18a, 18b.
  • the second bus bar 18b is fixed to the relay 12 (upper case 58) in this way, the inner hole of each cylindrical part 76 in the pressing part 70 and each through hole 50 in the second bus bar 18b are mutually connected. They are aligned and communicated in the vertical direction.
  • the third bus bar 18c is placed on the upper bottom wall 62 of the upper case 58, and the third and fourth bus bars in the fuse 14
  • the fuse 14 is placed on the second and third bus bars 18b and 18c so that the connecting portions 16c and 16d are overlapped. This aligns the bolt insertion holes 52 in each fuse connection portion 48 with the bolt insertion holes 34 in the third and fourth connection portions 16c and 16d.
  • the bolt 36 is inserted into each bolt insertion hole 34, 52 and fastened. Thereby, in addition to the relay 12 and the first and second bus bars 18a and 18b, the fuse 14 and the third bus bar 18c are fixed to the upper case 58.
  • the upper case 58 is turned upside down and placed so as to face the lower case 60 from above.
  • the thermally conductive sheet 24 ( The first to third thermally conductive sheets 24a to 24c) are placed and fixed with an adhesive or the like.
  • each protrusion 100 in the lower case 60 is inserted into and engaged with each through hole 116 in the second thermally conductive sheet 24b.
  • each guided portion 84 in the upper case 58 is inserted into each guide portion 110 in the lower case 60.
  • each guide portion 110 is guided along each guided portion 84, and the upper case 58 and lower case 60 are brought close to each other in the vertical direction.
  • each inclined surface 80 provided on each locked portion 74 and each inclined surface 108 provided on each locking portion 102 abut in the vertical direction, and each elastic piece 104 in each locked portion 102 is moved inward in the radial direction. It deforms elastically in the direction. This allows each protrusion 100 to be inserted into each cylindrical portion 76, each through hole 50, and each through hole 116.
  • each fitting claw 106 in each locking portion 102 overcomes each fitting claw 78 in each locked portion 74, so that each elastic piece 104 is elastically restored and deformed, and each fitting claw 106 is It is locked by the mating claw 78 .
  • each guided portion 84 is inserted into each guide portion 110 in a substantially press-fit state, and each locking portion 102 and each locked portion 74 are lock-fitted, so that upper case 58 and lower case 60 and are fixed to each other.
  • the circuit structure 10 is completed.
  • the second bus bar 18b and the second thermally conductive sheet 24b are stacked vertically, and each protrusion 100 is formed in each of the through holes 50 and 116 that are stacked on each other. It is placed through.
  • the circuit component 10 assembled in this manner is superimposed on a heat dissipating body (not shown) such as a vehicle body panel or a housing of a battery pack, and is fixed with bolts or the like.
  • a heat conductive member (not shown) provided on the lower surface of the bottom wall 90 of the lower case 60 can be compressed between the lower case 60 and the heat radiator in the vertical direction.
  • the heat generated by energization in the relay 12 and fuse 14 is transferred to the first to third heat transfer portions 40a to 40c of the first to third bus bars 18a to 18c, which are superimposed in the vertical direction, and to the first to third heat transfer portions 40a to 40c.
  • Heat is radiated from a heat radiator (not shown) via the heat conductive sheets 24a to 24c, a bottom wall 90 of the lower case 60, and a heat conducting member (not shown) provided on the lower surface of the bottom wall 90.
  • the lower case 60 constituting the case 20 is provided with a displacement regulating portion 118 that engages with the second thermally conductive sheet 24b and restricts displacement of the second thermally conductive sheet 24b.
  • a gap is generated between the lower case 60 and the second thermally conductive sheet 24b, for example, even when the case 20 expands or contracts due to exposure to a high temperature environment, or when a large impact is applied from the outside.
  • the desired heat dissipation effect can be stably exhibited.
  • the displacement regulating portion 118 advantageously reduces the stress generated at the interface between the lower case 60 and the second thermally conductive sheet 24b, so that the desired heat dissipation effect of the circuit structure 10 can be maintained.
  • the displacement regulating section 118 is configured to include each protrusion 100 on the lower case 60, and each protrusion 100 (each locking section 102) and each cylindrical section 76 on the upper case 58. (the respective locked portions 74) are lock-fitted to each other.
  • the second thermally conductive sheet 24b sandwiched between the upper case 58 and the lower case 60 can be moved in the front-rear direction and the left-right direction (that is, in the shearing direction) with respect to the case 20 (the upper case 58 and the lower case 60). Displacement is suppressed in either the vertical direction (tensile direction), and the desired heat dissipation effect can be exhibited.
  • the displacement regulating portion 118 has respective protruding portions 100 that protrude upward from the second mounting surface 22b of the lower case 60, and each protruding portion 100 is connected to each through hole 50 provided in the second bus bar 18b. 2 through holes 116 provided in the heat conductive sheet 24b.
  • each through hole 50 (that is, each locked portion 74 and each locked portion 102) is located relatively near the bolt fastening point (bolt insertion hole 44, 52) where external force is easily applied in the second bus bar 18b. is provided.
  • displacement of the second thermally conductive sheet 24b held between the second bus bar 18b and the lower case 60 with respect to the case 20 is also prevented.
  • the through holes in the bus bar (that is, the locking structure consisting of the locked part and the locking part) are arranged so that they face each other across the rotation axis at two locations distant from the rotation axis at the bolt fastening point (bolt insertion hole) in the bus bar. may be provided. Thereby, displacement of the bus bar in the rotational direction with respect to the case can be more effectively prevented.
  • the case 20 is composed of an upper case 58 and a lower case 60, and the upper case 58 and the lower case 60 have respective locked portions 74 and respective lock portions 102 that are lock-fitted to each other.
  • the second bus bar 18b on the upper case 58 side and the lower case 60 This suppresses the relative displacement between the second heat conductive sheet 24b and the second heat conductive sheet 24b sandwiched therebetween, thereby preventing the second heat conductive sheet 24b from peeling off from the second bus bar 18b and the lower case 60.
  • the upper case 58 is provided with positioning ribs 82 at the pressing portion 70 for positioning the second bus bar 18b.
  • each guided portion 110 is provided with each guided portion 84.
  • each locking portion 102 and each locked portion 74 are positioned relative to each other in the vertical direction.
  • each locking portion 102 is latched to each locked portion 74 by bringing the upper case 58 and lower case 60 closer to each other while maintaining the insertion state of each guided portion 110 into each guided portion 84. Therefore, the engagement between each lock portion 102 and each locked portion 74 can be stably realized.
  • the upper case 58 has a pressing part 70, and the second bus bar 18b and the second thermally conductive sheet 24b are sandwiched between the pressing part 70 and the lower case 60. Further, each locked portion 74 is provided on the pressing portion 70 and is adapted to engage with each lock portion 102 on the lower case 60. That is, in the vicinity of each lock portion 102 and each locked portion 74 that realize locking of upper case 58 and lower case 60, second bus bar 18b and second heat conductive sheet 24b are connected to the upper and lower portions of upper case 58 and lower case 60. Sandwiched between directions. Therefore, generation of a gap between the second thermally conductive sheet 24b and the lower case 60 due to vertical separation between the upper case 58 and the lower case 60 can be effectively prevented.
  • Embodiment 2 of the present disclosure will be described below with reference to FIGS. 7 to 9.
  • the circuit structure 130 of the second embodiment has the same basic structure as the circuit structure 10 of the first embodiment, but the structures of the cylindrical part 134 in the upper case 132 and the protrusion part 138 in the lower case 136 are different. . Therefore, in the following description, the differences from the circuit structure 10 in Embodiment 1 will be explained, and the same reference numerals as in Embodiment 1 will be used in the drawings for substantially the same members and parts as in Embodiment 1. Detailed explanation will be omitted by attaching it.
  • the upper case 132 of the second embodiment is provided with a pressing portion 70 that protrudes downward from the middle portion of the upper bottom wall 62 in the left-right direction.
  • This pressing part 70 is provided with a plurality of lightening holes 72 as in the first embodiment, and a cylindrical part 134 is provided in the lightening hole 72 in the central part of the pressing part 70 in the front-rear direction.
  • a pair of cylindrical portions 134, 134 are provided, and these pair of cylindrical portions 134, 134 are spaced apart from each other in the left-right direction.
  • each cylindrical portion 76 of the first embodiment was provided with each fitted claw 78 protruding toward the inner circumferential side to constitute each locked portion 74, but each cylindrical portion 134 of the second embodiment
  • the inner diameter dimension is substantially constant over the entire length in the vertical direction.
  • each protruding part 138 of the lower case 136 is press-fitted into the inner hole of each cylindrical part 134, so in the second embodiment, the inner hole of each cylindrical part 134 press-fits into the press-fit hole 140. is configured.
  • a protrusion 138 that protrudes upward is provided at the center portion of the second mounting surface 22b in the front-rear direction.
  • a pair of protrusions 138, 138 are provided, and these pair of protrusions 138, 138 are spaced apart from each other in the left-right direction.
  • each protrusion 100 of the first embodiment was provided with each elastic piece 104 and each fitting claw 106 to constitute each lock part 102, but each protrusion 138 of the second embodiment is The outer diameter is approximately constant over the entire length.
  • the outer diameter of each protruding portion 138 is approximately equal to or slightly larger than the inner diameter of each cylindrical portion 134 (each press-fit hole 140) in the upper case 132, so that when the upper case 132 and the lower case 136 are assembled,
  • each protrusion 138 is press-fitted into each press-fit hole 140. That is, in the second embodiment, each protrusion 138 is configured to include a press-fit protrusion 142.
  • the upper case 132 and the lower case 136 have a press-fit structure for each press-fit protrusion 142 into each press-fit hole 140 (and a press-fit structure for each guided part 84 into each guide part 110 as necessary). ) is fixed. At this time, each protrusion 138 is inserted into and engaged with each through hole 116 in the second thermally conductive sheet 24b in advance, thereby regulating the relative displacement between the lower case 136 and the second thermally conductive sheet 24b. .
  • a displacement regulating section 144 that includes each protrusion 138 and regulates the displacement of the second thermally conductive sheet 24b is configured.
  • the circuit structure 130 of the second embodiment differs from the circuit structure 10 of the first embodiment only in the fixing structure of the upper case 132 and the lower case 136. A similar effect can be achieved.
  • each press-fitting hole 140 is provided in the pressing portion 70, and each press-fitting protrusion 142 on the lower case 136 is press-fitted therein.
  • the second bus bar 18b and the second thermally conductive sheet 24b are connected to the upper case in the vicinity of each press-fit hole 140 and each press-fit protrusion 142 that realize fixation between the upper case 132 and the lower case 136. It is held between the case 132 and the lower case 136 in the vertical direction. Therefore, generation of a gap between the second thermally conductive sheet 24b and the lower case 136 due to vertical separation between the upper case 132 and the lower case 136 can be effectively prevented.
  • Embodiment 3 of the present disclosure will be described below with reference to FIGS. 10 to 12.
  • the circuit structure 150 of the third embodiment has the same basic structure as the circuit structure 10 of the first embodiment and the circuit structure 130 of the second embodiment. 152 has a different structure. Therefore, in the following description, differences from Embodiments 1 and 2 will be explained, and members and parts that are substantially the same as Embodiments 1 and 2 will be denoted with the same reference numerals as Embodiments 1 and 2. Detailed explanation will be omitted by adding .
  • bus bars 18 (first to third bus bars 18a to 18c) are provided as in the first and second embodiments, and a second thermally conductive sheet superimposed on the second bus bar 18b is provided.
  • 24b is divided into two in the left-right direction, and a left side second heat conductive sheet 154a and a right side second heat conductive sheet 154b are provided.
  • each heat conductive sheet 24 (first and third heat conductive sheets 24a, 24c, left and right second heat conductive sheets 154a, 154b) is Indicated by the dotted chain line.
  • the upper case 156 of the third embodiment is provided with a pressing portion 70 that protrudes downward from the middle portion of the upper bottom wall 62 in the left-right direction.
  • insertion grooves 158 that open outward in the front-back direction and extend in the up-down direction are provided on both sides of the outer circumferential surface of the pressing portion 70 in the front-back direction.
  • the insertion grooves 158 are provided at two locations separated in the left-right direction on both sides of the pressing part 70 in the front-rear direction, and a total of four insertion grooves 158 are provided for the pressing part 70. It is provided.
  • Each insertion groove 158 has a substantially rectangular cross section and has a predetermined width dimension (left-right dimension) and depth dimension (front-rear dimension).
  • the depth dimension of each of these insertion grooves 158 is made larger than the width direction dimension (front and rear direction dimension) of each positioning rib 82 provided at both ends of the pressing part 70 in the front and rear direction.
  • the bottom surface of the groove 158 is located further inward in the front-rear direction than each positioning rib 82.
  • the second heat conductive sheet 24b is divided in the left-right direction, and the left second heat conductive sheet 154a and the right second heat conductive sheet 154b are separated from each other in the left-right direction. It is provided.
  • the left second heat conductive sheet 154a is superimposed on the left side portion of the second bus bar 18b (the portion located to the left of the pressing portion 70 and located below the relay 12). It has become.
  • the second heat conductive sheet 154b on the right side is overlapped with a portion of the second bus bar 18b corresponding to the space between the insertion grooves 158, 158 in the left-right direction, which are spaced apart in the left-right direction. That is, when assembling the circuit component 150, the left and right second heat conductive sheets 154a, 154b are provided at positions separated from the insertion grooves 158 in the left-right direction.
  • the second thermally conductive sheet 24b is divided in the left-right direction to provide the left and right second thermally conductive sheets 154a, 154b.
  • the second upper accommodation recess 96b that accommodates the is also divided in the left-right direction, and is provided with a left-hand second accommodation recess 162a and a right-hand second accommodation recess 162b. That is, the left second heat conductive sheet 154a is accommodated in the left second accommodation recess 162a, and the right second heat conductive sheet 154b is accommodated in the right second accommodation recess 162b.
  • the bottom surfaces of the second left housing recess 162a and the second right housing recess 162b are respectively the left second mounting surface 164a and the right second mounting surface 164b.
  • Elastic locking pieces 166 that protrude upward are provided on the peripheral edge of the second mounting surface 164b on the right side at positions corresponding to the respective insertion grooves 158 of the upper case 156. That is, each elastic lock piece 166 is provided at two locations separated in the left-right direction on both sides of the right side second mounting surface 164b in the front-rear direction, and a total of four elastic lock pieces 166 are provided in the lower case 160. There is.
  • the right side second heat conductive sheet 154b is provided between the insertion grooves 158 that are spaced apart in the left and right direction, the right side second accommodation recess 162b (the right side second mounting surface 164b ), the right second heat conductive sheet 154b is accommodated between the elastic locking pieces 166 that are spaced apart in the left-right direction.
  • Each elastic locking piece 166 includes a bending piece 168 that protrudes upward from the bottom wall 90 of the lower case 160 and can be elastically deformed in both directions in the front and back directions on the outer peripheral side of the second heat-conducting sheet 154b on the right side, and a protruding end of the bending piece 168. It has a locking claw part 170 provided at the upper end thereof and protruding inward in the front-rear direction. The upper end surface of each lock claw portion 170 is an inclined surface 172 that gradually inclines inward in the left-right direction as it goes downward.
  • each member 156 and lower case 160 When assembling the upper case 156 and lower case 160 having the above structure, the upper case 156 to which each member is fixed is placed facing the lower case 160 from above. Then, according to the guiding action of each guide portion 110 and each guided portion 84, upper case 156 and lower case 160 are brought closer to each other in the vertical direction. As a result, each insertion groove 158 of the upper case 156 and each elastic lock piece 166 of the lower case 160 face each other in the vertical direction, and the second bus bar 18b protrudes so as to cover the lower opening of each insertion groove 158. Each inclined surface 172 of each elastic locking piece 166 abuts against both ends in the front-rear direction.
  • each elastic locking piece 166 is elastically deformed outward in the front-rear direction.
  • Each of these elastic locking pieces 166 is elastically deformed and restored when each locking claw part 170 gets over the second bus bar 18b, and each locking claw part 170 is locked to both ends of the second bus bar 18b in the front and back direction. Ru.
  • the upper case 156 and the lower case 160 are fixed using the lock mechanism (and the press-fitting structure of each guided portion 84 into each guide portion 110 as necessary) using each elastic lock piece 166 (each lock claw portion 170).
  • the circuit structure 150 is completed.
  • each locking claw portion 170 engages with the edge of the second bus bar 18b superimposed on the second heat conductive sheet 154b on the right side. That is, each elastic lock piece 166 provided on the lower case 160 is locked to the second bus bar 18b fixed to the upper case 156 side, and the vertical direction between the second bus bar 18b and the bottom wall 90 of the lower case 160 is A right second heat conductive sheet 154b is sandwiched between them. By locking each elastic locking piece 166 to the second bus bar 18b in this way, displacement of the right second heat conductive sheet 154b held between the second bus bar 18b and the bottom wall 90 is regulated.
  • the displacement regulating section 152 includes each elastic locking piece 166.
  • the circuit structure 150 of the third embodiment is also provided with a displacement regulating section 152 to regulate the displacement of the right second thermally conductive sheet 154b with respect to the lower case 160, so that the circuit structure 150 of the third embodiment is similar to the circuit structure 150 of the first embodiment. It can be effective.
  • each elastic locking piece 166 constituting the displacement regulating part 152 is not inserted through the second bus bar 18b as in the first and second embodiments, but is inserted into both ends of the second bus bar 18b in the front and rear direction. It is something that is locked in place. Therefore, there is no need to provide a through hole in the second bus bar 18b for inserting the displacement regulating portion 152 (each elastic locking piece 166), and deterioration of conduction performance is avoided.
  • the bus bar 18 for energization (the first to third bus bars 18a to 18c) is provided with the heat transfer section 40 (the first to third heat transfer section 40a to 40c), and the bus bar 18 is
  • a bus bar for both energization and heat transfer has been employed, the bus bar for energization and the bus bar for heat transfer may be separately employed.
  • the current-carrying bus bar and the heat-transfer bus bar may be fixed together by being fastened with bolts to a connecting portion of a heat-generating component (for example, a relay or a fuse).
  • the heat-transfer bus bar that sandwiches a heat-conducting member (for example, a heat-conducting sheet) between the lower case and the heat-transfer bus bar according to the first and second embodiments is It is sufficient to provide a through hole such as the one described above or adopt a structure in which an elastic locking piece is locked as in the third embodiment, and there is no need to provide a special structure in the energizing bus bar.
  • each guided portion 84 in the upper case 58, 132, 156 is inserted into each guide portion 110 in the lower case 60, 136, 160 in a substantially press-fit state, and the upper case 58, 132, 156 and the lower case 60, 136, 160, but the embodiment is not limited to this.
  • the upper case and the lower case have a lock fitting structure between a locking part and a locked part as in the first embodiment, a press-fitting structure of a press-fit protrusion into a press-fit hole as in the second embodiment, and a structure in which a press-fit protrusion is inserted into a press-fit hole as in the third embodiment.
  • the lower case may be fixed using at least one structure in which an elastic lock piece provided on the lower case is locked to a bus bar fixed to the upper case.
  • the guide part and the guided part do not have to have the function of fixing the upper case and the lower case, but simply move the upper case and the lower case in a direction toward each other when the upper case and lower case are assembled. It may just have the function of providing guidance. Further, a locking mechanism or the like for fixing the upper case and the lower case may be provided separately from the guide portion and the guided portion on the upper peripheral wall of the upper case and the lower peripheral wall of the lower case. Note that in the circuit structure according to the present disclosure, the guide portion and the guided portion are not essential.
  • a plurality of thermally conductive sheets 24 are provided as thermally conductive members, and in the first and second embodiments, the second thermally conductive sheet 24b is provided with displacement regulating portions 118, 144 to prevent lower cases 60, 136. While the displacement is regulated, in the third embodiment, the displacement with respect to the lower case 160 is regulated by the displacement regulating portion 152 in the second right heat conductive sheet 154b, but the present invention is not limited to this aspect. For example, the displacement of two or more of the plurality of thermally conductive members (for example, thermally conductive sheets) provided with respect to the case may be restricted by the displacement regulating portion.
  • those whose displacement with respect to the case is not regulated by the displacement regulating portion are limited to the mode in which they are sandwiched in the vertical direction by the heat transfer portion of the bus bar and the lower case as in the above embodiment. isn't it. That is, for example, a through window penetrating the bottom wall of the lower case in the thickness direction is provided so that the heat transfer part comes into thermal contact with the heat sink directly through the through window or via a heat conductive member. It's okay.
  • each elastic lock piece 166 were configured to engage with both ends of the second bus bar 18b in the front and back direction, but the present invention is not limited to this mode. That is, for example, the lock claw portion of the elastic lock piece may be engaged with a pressing portion of the upper case that presses the bus bar (for example, the second bus bar) from above.
  • the lower case 60 is provided with a pair of protrusions 100, 100, and each protrusion 100 is provided with a lock portion 102
  • the lower case 136 is provided with a pair of protrusions 100, 100.
  • the parts 138, 138 are provided and the press-fit protrusions 142 are provided on each protrusion 138
  • the present invention is not limited to this embodiment.
  • the aspects of Embodiment 1 and Embodiment 2 may be combined and employed, and the aspects of Embodiment 3 may also be employed in combination. That is, at least two of the aspects described in Embodiments 1 to 3 can be employed in combination.
  • the displacement regulating portions 118, 144, and 152 were all provided in the lower cases 60, 136, and 160 that constitute the case 20, but they may be provided in the upper case, for example. That is, for example, a protruding part constituting a displacement regulating part may be provided on the upper case, and a locked part that locks into the locking part of the protruding part may be provided on the lower case, or a press-fitting protrusion on the protruding part may be press-fitted. A press fit hole may be provided in the lower case. Alternatively, an elastic locking piece constituting the displacement regulating portion may be provided on the upper case, and the elastic locking piece may be engaged with an edge of a bus bar fixed to the lower case.
  • the relay 12, the fuse 14, and the bus bar 18 are , 132, 156 side, and the upper case 58, 132, 156 is assembled to the lower case 60, 136, 160, so that the relay 12, fuse 14, and bus bar 18 (first to third bus bars 18a to 18c) Although it is also fixed to the lower case 60, 136, 160, it is not limited to this mode.
  • the heat-generating parts for example, relays and fuses
  • the bus bar may be assembled to the lower case side, and by assembling the upper case to the lower case, the heat-generating parts and the bus bar can also be fixed to the upper case. It may be.
  • the second heat conductive sheet 24b is divided in the left and right direction to provide left and right second heat conductive sheets 154a, 154b, and these left and right second heat conductive sheets 154a, 154b have respective elastic properties.
  • the lock piece 166 was provided so as to be removed from its position, the present invention is not limited to this embodiment. That is, in the third embodiment as well, the second thermally conductive sheet 24b having the same shape as in the first and second embodiments may be employed. In this case, the displacement of the second thermally conductive sheet 24b in the front-rear direction may be restricted by the flexible pieces of each elastic lock piece.
  • each heat conductive sheet 24 (first to third heat conductive sheets 24a to 24c, left and right second heat conductive sheets 154a, 154b) is placed in advance on the bottom wall 90 of the lower case 60, 136, 160.
  • the mounting surface 22 the first to third mounting surfaces 22a to 22c, and the left and right second mounting surfaces 164a and 164b
  • each heat conductive member may be fixed in advance to the lower surface of each heat transfer portion in each bus bar.
  • the provision of the displacement regulating portions 118, 144, and 152 allows the displacement of the second thermally conductive sheet 24b with respect to the case 20 to be controlled in the front-rear direction, the left-right direction (shear direction), and the up-down direction (tensile direction). Although it was suppressed in each direction, it is not limited to this aspect.
  • the displacement regulating portion only needs to regulate the displacement of the heat conductive member with respect to the case in at least one of the front-rear direction, the left-right direction, and the up-down direction.
  • Circuit construct (Embodiment 1) 12 Relay (heat generating part) 14 Fuse (heat generating component) 16 Connection portion 16a First connection portion 16b Second connection portion 16c Third connection portion 16d Fourth connection portion 18 Bus bar 18a First bus bar 18b Second bus bar 18c Third bus bar 20 Case 22 Placement surface 22a First placement Surface 22b Second mounting surface 22c Third mounting surface 24 Thermal conductive sheet (thermal conductive member) 24a First thermally conductive sheet 24b Second thermally conductive sheet 24c Third thermally conductive sheet 26 Relay body 28 Insulating plate 30 Legs 32 Fuse body 34 Bolt insertion hole 36 Bolt 38 Relay connection part 38a First relay connection part 38b Second relay Connection section 40 Heat transfer section 40a First heat transfer section 40b Second heat transfer section 40c Third heat transfer section 42 Left external connection section 44, 46 Bolt insertion hole 48 Fuse connection section 50 Through hole 52 Bolt insertion hole 54 Right side External connection part 56 Bolt insertion hole 58 Upper case 60 Lower case 62 Upper bottom wall 64 Upper peripheral wall 66a, 66b Opening part

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Or Junction Boxes (AREA)
  • Casings For Electric Apparatus (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
PCT/JP2023/020404 2022-06-10 2023-06-01 回路構成体 Ceased WO2023238758A1 (ja)

Priority Applications (2)

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CN202380044641.4A CN119234473A (zh) 2022-06-10 2023-06-01 电路结构体
US18/871,635 US20260006728A1 (en) 2022-06-10 2023-06-01 Circuit assembly

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JP2022-094496 2022-06-10
JP2022094496A JP2023180855A (ja) 2022-06-10 2022-06-10 回路構成体

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026079328A1 (ja) * 2024-10-08 2026-04-16 矢崎総業株式会社 電気接続箱

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58103170U (ja) * 1982-01-06 1983-07-13 株式会社日立製作所 機器の筐体
JP2006217736A (ja) * 2005-02-03 2006-08-17 Denso Corp ブスバーの放熱プレートへの取り付け構造
JP2019169602A (ja) * 2018-03-23 2019-10-03 株式会社オートネットワーク技術研究所 回路構成体
WO2021230125A1 (ja) * 2020-05-15 2021-11-18 株式会社オートネットワーク技術研究所 回路構成体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58103170U (ja) * 1982-01-06 1983-07-13 株式会社日立製作所 機器の筐体
JP2006217736A (ja) * 2005-02-03 2006-08-17 Denso Corp ブスバーの放熱プレートへの取り付け構造
JP2019169602A (ja) * 2018-03-23 2019-10-03 株式会社オートネットワーク技術研究所 回路構成体
WO2021230125A1 (ja) * 2020-05-15 2021-11-18 株式会社オートネットワーク技術研究所 回路構成体

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026079328A1 (ja) * 2024-10-08 2026-04-16 矢崎総業株式会社 電気接続箱

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JP2023180855A (ja) 2023-12-21
US20260006728A1 (en) 2026-01-01

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