WO2021210658A1

WO2021210658A1 - Circuit unit in vehicle-mounted electrical component

Info

Publication number: WO2021210658A1
Application number: PCT/JP2021/015646
Authority: WO
Inventors: 清水　宏
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: 2020-04-15
Filing date: 2021-04-15
Publication date: 2021-10-21
Also published as: JP2021170591A

Abstract

Disclosed is a circuit unit in a vehicle-mounted electrical component, the circuit unit having a novel structure and being able to improve connection workability between a connector and a circuit member of the circuit unit and being able to improve heat dissipation.　In a circuit unit 10 inside a vehicle-mounted electrical component, a connection member 100 has a circuit-side connection part 100b provided at a projecting end part that projects toward a second surface 82 side of a side opposite to a first surface 78 of a plate wall section 34. The circuit-side connection part 100b is connected to a circuit member 40. A holding body 32 has a heat transfer surface 28 thermally contacting a casing 124, and, in a state in which the heat transfer surface 28 is thermally contacting the casing 124, the holding body 32 is fixed to the casing 124. In a state in which the holding body 32 is fixed to the casing 124, the plate wall section 34 covers a casing through-hole 148, and a sealing member 88 contacts a peripheral edge of the casing through-hole 148 from an inner side of the casing 124.

Description

In-vehicle electrical component circuit unit

The present disclosure relates to a circuit unit in an in-vehicle electric component housed in a housing of an in-vehicle electric component.

Patent Document 1 describes a structure in which a circuit unit such as a junction box is housed together with a battery module, a battery control system, and the like in a housing of a battery pack, which is an in-vehicle electric component mounted on a vehicle. Here, in order to enable the connection of the circuit unit housed in the battery pack housing to an external device, a connector to which an external mating connector is connected is provided on the peripheral wall of the housing, and the connector and the circuit unit are connected. A structure is adopted in which the wires are conductively connected by a covered electric wire or a bus bar.

Japanese Unexamined Patent Publication No. 2012-243449

In the structure of Patent Document 1, the connection work between the connector provided in the housing and the circuit member of the circuit unit housed in the housing is a horizontal work in a narrow space between the facing surfaces thereof. There was a problem that workability was poor. In addition, since the circuit unit is housed in the housing of the in-vehicle electric component, heat tends to be trapped in the housing. Therefore, as a member constituting the circuit unit, there is a case where a member having a high permissible temperature and causing a high cost has to be adopted.

Therefore, we will disclose a circuit unit in an in-vehicle electric component having a new structure that can improve the connection workability between the connector and the circuit member of the circuit unit and the heat dissipation.

The circuit unit in an in-vehicle electric component of the present disclosure is held by an insulating holding body that holds a circuit member, a plate wall portion that covers a housing through hole provided in a housing of the in-vehicle electric component, and the plate wall portion. A connector having connecting members protruding on both sides of the plate wall portion in the plate thickness direction, and an annular shape provided on the first surface of the plate wall portion, which is a surface to be attached to the housing, and in contact with the peripheral edge of the housing through hole. The connecting member includes a sealing member, and the connecting member has a circuit-side connecting portion provided at a protruding end portion of the plate wall portion on the side opposite to the first surface to the second surface side, and the circuit-side connecting portion. Is connected to the circuit member, the holding body has a heat transfer surface that is in thermal contact with the housing, and the holding body is in a state where the heat transfer surface is in thermal contact with the housing. Is fixed to the housing, and in a state where the holding body is fixed to the housing, the plate wall portion covers the housing through hole and the sealing member is on the inner side of the housing. It is a circuit unit in an in-vehicle electric component that comes into contact with the peripheral edge of the housing through hole.

According to the present disclosure, it is possible to provide a circuit unit in an in-vehicle electric component having a new structure capable of improving connection workability between a connector and a circuit member of a circuit unit and improving heat dissipation.

FIG. 1 is an overall perspective view showing a state in which the circuit unit in the vehicle-mounted electric component according to the first embodiment is housed in the housing of the vehicle-mounted electric component. FIG. 2 is an exploded perspective view of FIG. FIG. 3 is a view when the exploded perspective view shown in FIG. 2 is viewed from the lower side. FIG. 4 is an exploded perspective enlarged view of the circuit unit in the vehicle-mounted electric component shown in FIG. FIG. 5 is an enlarged view of a VV cross section in FIG. FIG. 6 is an enlarged cross-sectional view of VI-VI in FIG. FIG. 7 is a diagram schematically showing an electrical configuration of a circuit unit in an in-vehicle electric component in a path from a power source to a load.

<Explanation of Embodiments of the present disclosure>
First, embodiments of the present disclosure will be listed and described.
The circuit unit in the in-vehicle electric component of the present disclosure is
(1) An insulating holding body that holds a circuit member, a plate wall portion that covers a housing through hole provided in a housing of an in-vehicle electric component, and both sides of the plate wall portion that are held by the plate wall portion in the plate thickness direction. A connector having a connecting member protruding into the housing, and an annular sealing member provided on a first surface of the plate wall portion to be attached to the housing and in contact with the peripheral edge of the housing through hole. The connecting member has a circuit-side connecting portion provided at a protruding end portion of the plate wall portion on the side opposite to the first surface side toward the second surface side, and the circuit-side connecting portion is connected to the circuit member. The holding body has a heat transfer surface that is in thermal contact with the housing, and the holding body is fixed to the housing in a state where the heat transfer surface is in thermal contact with the housing. In a state where the holding body is fixed to the housing, the plate wall portion covers the housing through hole, and the sealing member is formed from the inside of the housing to the housing through hole. It is a circuit unit in an in-vehicle electric component that comes into contact with the peripheral edge.

According to the circuit unit in the vehicle-mounted electric component of the present disclosure, the connector is provided on the plate wall portion that covers the housing through hole provided in the housing, and the connector connecting member that projects to the second surface side of the plate wall portion. The circuit-side connector of the above is connected to the circuit member. Therefore, the connector can be a component on the circuit unit side in the vehicle-mounted electric component, and the circuit side connection portion of the connector and the circuit member can be connected in advance before the circuit unit is mounted on the housing. As a result, it is not necessary to perform the connection work between the connector and the circuit member of the circuit unit in the vehicle-mounted electric component in a narrow space, and the connection workability can be improved.

Further, the holding body that holds the circuit member has a heat transfer surface that is in thermal contact with the housing, and is fixed to the housing in a state where the heat transfer surface is in thermal contact with the housing. Therefore, the heat generated in the circuit member can be transferred to the housing through the heat transfer surface of the holding body, and the heat dissipation of the circuit unit in the vehicle-mounted electric component can be improved. As a result, the degree of freedom in selecting the members constituting the circuit unit in the vehicle-mounted electric component is improved, and the cost can be reduced.

An annular sealing member that contacts the peripheral edge of the housing through hole is provided on the first surface of the plate wall portion that holds the connector, and the plate wall portion is held in a state where the holding body is fixed to the housing. The seal member covers the body through hole and comes into contact with the peripheral edge of the housing through hole from the inside of the housing. Thereby, it is possible to provide a configuration in which the connector connected to the circuit member protrudes to the outside of the housing while maintaining the waterproof property of the housing through hole. Further, the connecting member of the connector may be composed of a covered electric wire having a circuit-side connecting portion at one end, or may be composed of a bus bar having a circuit-side connecting portion integrally provided at one end. Further, the plate wall portion may be fixed to the holding body by connecting the circuit-side connecting portion of the connector to the circuit member, or may be fixed to the holding body via another connecting member.

(2) It is preferable that the heat transfer surface of the holding body is in thermal contact with the housing via a heat conductive member. By interposing a heat conductive member between the heat transfer surface and the housing, the contact area between the heat transfer surface and the housing can be secured more stably, and the heat dissipation can be further improved. Is.

(3) The heat conductive member is preferably an elastic heat conductive sheet. Since the heat conductive member has elasticity, the adhesion between the heat transfer surface of the holder and the heat conductive member and the heat conductive member and the housing can be improved. Therefore, the heat transfer surface of the holder can be reliably brought into contact with the housing via the heat conductive member. Moreover, since the heat conductive member is in the form of a sheet, it is easy to handle.

(4) The connecting member of the connector has an external connecting portion provided at the protruding end portion of the plate wall portion on the first surface side, and the connector surrounds the periphery of the external connecting portion. It is preferable to have a hood portion protruding toward the first surface side. Since the connector has a hood portion that protrudes to the first surface side of the plate wall portion and the external connection portion is arranged in the hood portion, a connector that can stably connect to the external mating connector is provided. It can be provided on the board wall.

<Details of Embodiments of the present disclosure>
Specific examples of the circuit unit in the vehicle-mounted electric component of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<Embodiment 1>
Hereinafter, the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 7. The circuit unit 10 in an in-vehicle electric component is mounted on a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, and supplies and controls electric power from a power source 12 such as a battery to a load 14 such as a motor (FIG. 7). reference). The circuit unit 10 in the vehicle-mounted electric component can be arranged in any direction, but the Z direction will be described as upward, the Y direction as the width direction, and the X direction as the front in the length direction. Further, for a plurality of the same members, a reference numeral may be added to only a part of the members, and the reference numeral may be omitted for other members.

<Rough circuit configuration of circuit unit 10 in vehicle-mounted electric components>
As shown in FIG. 7, the in-vehicle electric component internal circuit unit 10 includes an in-vehicle electric component internal circuit unit 10a provided on the positive electrode side and an in-vehicle electric component internal circuit unit 10b provided on the negative electrode side. The positive electrode side of the power supply 12 is connected to the input side of the circuit unit 10a in the vehicle-mounted electric component, and the negative electrode side of the power supply 12 is connected to the input side of the circuit unit 10b in the vehicle-mounted electric component. The positive electrode side of the load 14 is connected to the output side of the circuit unit 10a in the vehicle-mounted electric component, and the negative electrode side of the load 14 is connected to the output side of the circuit unit 10b in the vehicle-mounted electric component. Relays 16 for connecting the power supply 12 to the load 14 are connected between the input side and the output side of the in-vehicle electric component internal circuit unit 10a and the in-vehicle electric component internal circuit unit 10b, respectively.

In addition, a precharge circuit 22 in which the precharge resistor 18 and the precharge relay 20 are connected in series so as to bypass the relay 16 is connected to the relay 16 that connects the power supply 12 and the positive electrode side of the load 14. .. In the first embodiment of the present disclosure, as shown in FIG. 7, the precharge resistor 18 is connected to the input side of the precharge relay 20. The precharge circuit 22 is also connected to the relay 16 that connects the power supply 12 and the negative electrode side of the load 14, but in order to facilitate understanding, in the first embodiment of the present disclosure, the power supply 12 and the load 14 are connected. The precharge circuit 22 connected to the relay 16 connecting the negative electrode side is not shown. Further, both the relay 16 and the precharge relay 20 are relays that move the contact portion to switch the contact portion ON / OFF while the exciting coil is energized, and are power distribution components provided in the in-vehicle electric component 118 described later. ON / OFF control is performed by the control circuit in 126. As described above, the in-vehicle electric component internal circuit unit 10a and the in-vehicle electric component internal circuit unit 10b have substantially the same structure.

<Circuit unit in in-vehicle electric component 10>
As shown in FIGS. 3 and 4, the in-vehicle electric component internal circuit unit 10 includes a lower case 24 located above and an upper case 26 located below when mounted on a vehicle, and is insulated by the lower case 24 and the upper case 26. The sex retainer 32 is configured. More specifically, when mounted on a vehicle, the lower case 24 is located on the upper cover 122 side of the vehicle-mounted electric component 118 described later, and the upper case 26 is located at a position farther from the upper cover 122 than the lower case 24. Further, a heat transfer sheet 30 which is a heat transfer member is attached to the heat transfer surface 28 which is the surface of the lower case 24 on the upper cover 122 side. Further, the circuit unit 10 in the vehicle-mounted electric component includes a rectangular flat plate-shaped plate wall portion 34 extending in the width direction and the vertical direction. The plate wall portion 34 is formed by using a metal such as aluminum or an aluminum alloy by, for example, die casting or press punching. Further, the circuit unit 10 in the vehicle-mounted electric component includes a connector 36 for connecting the load 14.

<Holder 32>
In a state where the lower case 24 and the upper case 26 constituting the holding body 32 are assembled, a bus bar (not shown) connecting the relay 16 and the precharging circuit 22 and the inside of the precharging circuit 22 are connected inside the holding body 32 (not shown). A bus bar etc. are stored. Further, the two relays 16 and the bus bars 40 and 42 connected to the connecting portions 38a and 38b of the respective relays 16 are held by the holding body 32 to which the lower case 24 and the upper case 26 are assembled. As described above, the circuit member is composed of the precharge resistor 18 and the precharge relay 20 constituting the precharge circuit 22, the relay 16, various bus bars housed in the holding body 32, and the like. Then, these circuit members are held by the insulating holding body 32.

<Lower case 24>
The lower case 24 is formed by injection molding an insulating synthetic resin into a predetermined shape. As shown in FIG. 4, for example, the lower case 24 has a horizontally long and flat rectangular box shape as a whole. As shown in FIG. 3, the lower case 24 is open toward the upper case 26, and the four corners of the lower case 24 are cut out in a quadrant circle.

<Heat conduction sheet 30>
As shown in FIG. 4, a heat transfer sheet 30 constituting a rectangular flat plate-shaped heat transfer member is attached to the heat transfer surface 28 which is the bottom surface of the lower case 24. The heat conductive sheet 30 has a flat sheet shape in the vertical direction and is made of a synthetic resin having a higher thermal conductivity than air. Specifically, silicone-based resins, non-silicone-based acrylic resins, ceramic-based resins, and the like can be used. More specifically, heat conductive silicone rubber and the like can be mentioned. The heat conductive sheet 30 has flexibility and elasticity, and can be elastically deformed so that the thickness dimension changes according to the force applied in the vertical direction. In the present embodiment, the heat conductive sheet 30 is used as the heat conductive member, but the heat conductive member is not limited to this, and any shape of the heat conductive member can be used. For example, heat dissipation made of a silicone-based resin can be used. Gap fillers and heat conductive greases may be used.

<Upper case 26>
The upper case 26 is formed by injection molding an insulating synthetic resin into a predetermined shape. As shown in FIG. 4, for example, the upper case 26 has a horizontally long and flat rectangular box shape as a whole. The upper case 26 is open toward the lower case 24, and cylindrical upper case fixing portions 46 are provided at four corners of the upper case 26 so as to project. The upper case fixing portion 46 has a smaller diameter on the protruding end side than on the base end side. A bolt insertion hole 48 is formed in the protruding end surface of the upper case fixing portion 46 (see FIG. 4), and a case fixing cylinder portion 154 described later is housed in the base end portion of the upper case fixing portion 46. A cylinder storage recess 50 for fixing the case is formed (see FIG. 2). In addition, a bus bar fixing portion 54 having a rectangular block shape is provided at the central portion in the width direction (Y direction) at the rear end portion of the top surface 52 of the upper case 26 (see FIG. 4). More specifically, in the bus bar fixing portion 54, the front end portion is connected to the rear end portion of the top surface 52 of the upper case 26. The bottom surface 56 of the bus bar fixing portion 54 is provided with two bolt insertion holes 58 separated in the width direction (see FIG. 2).

As shown in FIG. 4, a bus bar fixing cylinder portion 60 having two cylindrical shapes is formed so as to project from the front end portion of the top surface 52 of the upper case 26. The two bus bar fixing cylinders 60 are arranged apart from each other in the width direction. Bolt insertion holes 62 are provided on the protruding end faces of these bus bar fixing cylinders 60. Further, at the central portion of the upper case 26 in the length direction of the top surface 52, a relay fixing cylinder portion 64 having six cylindrical shapes is formed so as to project. Bolt insertion holes 66 are provided on the protruding end faces of these relay fixing cylinders 64. Further, on the rear side of the top surface 52 of the upper case 26, a precharge resistor mounting portion 68 and a precharge relay mounting portion 70 for accommodating the precharge resistor 18 and the precharge relay 20 are provided.

<Relay 16>
The relay 16 is a mechanical relay, and ON / OFF control is performed by a control circuit provided in the power distribution component 126 of the vehicle-mounted electric component 118 described later. As shown in FIG. 4, the relay 16 includes a block-shaped relay main body 72, a pair of annular connecting portions 38a and 38b, and a plurality of (three in the present embodiment) leg portions 74. The leg portion 74 is formed so as to project outward in a flat plate shape. The leg portion 74 has a bolt insertion hole 76 that penetrates in the vertical direction.

<

Busbars

40, 42>
The pair of

bus bars

40 and 42 are formed by processing a metal plate material, each of which has conductivity. Each of the bus bars 40 and 42 has a crank shape, for example, as shown in FIG. One end of each of the bus bars 40 and 42 is connected to the connection portions 38a and 38b of the relay 16, respectively. The other end 41 of the bus bar 40 is connected to the circuit side connection 100b of the connection member 100 of the connector 36 described later, and the other end 43 of the bus bar 42 is the input side of the circuit unit 10 in the vehicle-mounted electric component. The positive electrode side and the negative electrode side of the power supply 12 are connected to each other. More specifically, the other end 43 of the bus bar 42 is inserted into the housing 124 of the vehicle-mounted electrical component 118 through the wire harness insertion hole 136 provided in the housing 124 of the vehicle-mounted electrical component 118 as described later. It is also connected to the wire harness 140 connected to the power supply 12 (see, for example, FIG. 2). The wire harness 140 is attached to the wire harness insertion hole 136 via, for example, a grommet 138, so that waterproofness is ensured. The wire harness 140 is also connected to a power distribution component 126, which will be described later.

<Board wall 34>
The plate wall portion 34 is a surface that is superposed on the housing 124 of the vehicle-mounted electric component 118, which will be described later, and is a surface opposite to the first surface 78 and the first surface 78 that are located forward in FIGS. 2 and 3. It has a second surface 82 located rearward in FIGS. 2 and 3. For example, as shown in FIG. 4, bolt insertion holes 80 are formed at the four corners of the first surface 78 of the plate wall portion 34. The bolt insertion hole 80 is open toward the front. Moreover, the bolt insertion hole 80 also extends into the cylindrical plate wall portion fixing cylinder portion 84 that protrudes rearward from the second surface 82 of the plate wall portion 34. Further, on the first surface 78 of the board wall portion 34, a seal member storage groove portion 86 extending along the peripheral edge portion of the board wall portion 34 in a rectangular cross-sectional shape over the entire circumference is formed. An annular rubber seal member 88 is housed in the seal member storage groove 86. Further, the plate wall portion 34 has a plate wall through hole 90 having a rectangular cross-sectional shape penetrating in the plate thickness direction (front-rear direction). A cylindrical tubular portion 92 that projects forward over the entire circumference is provided on the peripheral edge of the plate wall through hole 90. In addition, in the vicinity of the four corners of the tubular portion 92, a connector fixing tubular portion 94 having a cylindrical shape is formed so as to project with the same protruding dimension as the tubular portion 92. A bolt insertion hole 96 that opens toward the front is provided on the protruding end surface of the connector fixing cylinder portion 94.

<Connector 36>
As shown in FIGS. 2 to 5, the connector 36 has a connector housing 98 made of synthetic resin and a pair of

metal connecting members

100 and 100.

For example, as shown in FIG. 4, the connector housing 98 has a rectangular flat plate-shaped fixing portion 102. Bolt insertion holes 104 penetrating in the plate thickness direction are provided at the four corners of the fixing portion 102. A cylindrical hood portion 108 projects forward from the front surface 106 of the fixed portion 102. Further, a cylindrical cylindrical portion 112 is projected rearward from the rear surface 110 of the fixed portion 102. As shown in FIG. 6, the tubular portion 112 is formed to have a diameter slightly smaller than that of the tubular portion 92 of the plate wall portion 34, and when the connector housing 98 is attached to the plate wall portion 34, the tubular portion 112 has a cylindrical shape of the connector housing 98. The outer peripheral surface of the portion 112 is in contact with or close to the inner peripheral surface of the cylindrical portion 92 of the plate wall portion 34. Further, in the fixing portion 102 surrounded by the hood portion 108 and the cylindrical portion 112, a vertically long slit-shaped connecting member insertion hole 114 into which a pair of connecting

members

100, 100 is press-fitted is formed so as to penetrate in the plate thickness direction. Has been done.

<A pair of connecting

members

100, 100>
The pair of connecting

members

100, 100 are formed by processing a conductive metal plate material. As shown in FIGS. 2 to 5, the pair of connecting

members

100, 100 have a rectangular flat plate shape. Of the connecting members 100, the external connecting portion 100a is formed by the protruding end portion on the first surface 78 side of the board wall portion 34 (see FIG. 6), and the second surface 82 on the side opposite to the first surface 78 of the board wall portion 34. The circuit side connection portion 100b is configured by the protruding end portion toward the side (see FIG. 4).

<In-vehicle electrical components 118>
As shown in FIGS. 1 to 3, the in-vehicle electric component 118 is mounted on a vehicle (not shown) such as an electric vehicle or a hybrid vehicle. As shown in FIG. 2, for example, the in-vehicle electric component 118 includes a lower cover 120 located below and an upper cover 122 located above when mounted on a vehicle, and the housing 124 is insulated by the lower cover 120 and the upper cover 122. Is configured. Further, the in-vehicle electric component 118 houses a power distribution component 126 having a control circuit or the like in the housing 124.

<Lower cover 120>
For example, as shown in FIG. 2, the lower cover 120 is formed by injection molding an insulating synthetic resin into a predetermined shape. The lower cover 120 has a rectangular box shape and opens upward. The lower cover 120 has a lower cover flange portion 128 extending outward in the horizontal direction (width direction and length direction) from the peripheral edge of the opening to the entire circumference. The lower cover flange portion 128 is provided with a plurality of bolt insertion holes 130 (20 in the present embodiment) that penetrate in the plate thickness direction and are separated from each other in the circumferential direction. The bolt insertion hole 130 is also formed so as to extend into the cylindrical lower cover fixing cylinder portion 132 that projects downward from the lower surface of the lower cover flange portion 128. Further, on the lower cover flange portion 128, an annular rubber seal 133 that is sandwiched between the lower cover flange portion 128 and the upper cover flange portion 142 to prevent water from entering the housing 124 is arranged. In addition, a wire harness insertion hole 136 having a circular cross-sectional shape is formed through the peripheral wall 134 on one side in the width direction (Y direction) of the lower cover 120 in the plate thickness direction. A cylindrical rubber grommet 138 is fitted in the wire harness insertion hole 136, and the wire harness 140 is inserted into the housing 124 through a through hole provided in the center of the grommet 138. The wire harness 140 supplies power to the circuit unit 10 in the vehicle-mounted electric component and the power distribution component 126 of the vehicle-mounted electric component 118. Further, the grommet 138 stops water between the wire harness insertion hole 136 and the wire harness 140.

<Upper cover 122, housing through hole 148>
For example, as shown in FIG. 2, the upper cover 122 is formed by injection molding an insulating synthetic resin into a predetermined shape. The upper cover 122 has a rectangular box shape and opens downward. The upper cover 122 has an upper cover flange portion 142 that extends outward in the horizontal direction (width direction and length direction) from the peripheral edge of the opening to the entire circumference. The upper cover flange portion 142 is provided with a plurality of bolt insertion holes 144 penetrating in the plate thickness direction (20 in the present embodiment) separated from each other in the circumferential direction. Further, a horizontally long rectangular cross-sectional shape housing through hole 148 is formed through the peripheral wall 146 on the front side (X direction) side of the upper cover 122 in the plate thickness direction. Bolt insertion holes 150 are provided in the vicinity of the four corners of the peripheral edge of the housing through hole 148. Further, as shown in FIG. 3, four case fixing cylinders 154 are formed so as to protrude from the back surface of the top surface 152 of the upper cover 122, and bolts are formed on the protruding end faces of each case fixing cylinder 154. An insertion hole 156 is provided.

As shown in FIGS. 2 and 3, a vertically long rectangular cross-sectional work hole 158 is formed through the top surface 152 on the rear side in the length direction of the upper cover 122 in the plate thickness direction. Bolt insertion holes 160 are formed in the central portions of the four sides of the peripheral edge of the work hole 158. Further, a seal storage recess 162 is provided so as to extend along the peripheral edge of the work hole 158 and surround the bolt insertion hole 160. A rubber seal 164 is held in the seal storage recess 162. The work hole 158 is covered by using a rectangular lid portion 166 having an outer diameter that completely covers the seal accommodating groove 162. At the time of covering the cover, the bolt insertion hole 168 provided in the lid portion 166 is aligned with the bolt insertion hole 160 provided in the work hole 158, and then the lid portion 166 and the upper cover 122 are fixed by fastening the bolts. As a result, the seal 164 is sandwiched between the lid portion 166 and the top surface 152 of the upper cover 122 and adheres to each other to provide waterproofing.

<Assembly process of circuit unit 10 in vehicle-mounted electric components>
Subsequently, an example of the assembling process of the circuit unit 10 in the vehicle-mounted electric component will be described. The assembly process of the circuit unit 10 in the in-vehicle electric component is not limited to the following description.

First, the lower case 24 and the upper case 26 constituting the holding body 32 are prepared. Next, the lower case 24 and the upper case 26 are assembled in a state where a bus bar (not shown) for connecting the relay 16 and the precharge circuit 22 and a bus bar (not shown) for connecting the inside of the precharge circuit 22 are housed inside the holder 32. The holding body 32 is completed. Here, the heat transfer sheet 30 which is a heat transfer member may be attached to the heat transfer surface 28 of the lower case 24 in advance, or an arbitrary step until the holding body 32 is attached to the housing 124 of the in-vehicle electric component 118. You may paste it with. Subsequently, the precharge resistor 18 and the precharge relay 20 are housed in the precharge resistor mounting portion 68 and the precharge relay mounting portion 70 provided on the holding body 32, respectively. Further, the leg portion 74 of the relay 16 is arranged on the relay fixing cylinder portion 64 provided on the holding body 32 and bolted. Further, one end of each of the bus bars 40 and 42 is connected to the connection portions 38a and 38b of the relay 16 by bolting. In this state, the other end 41 of the bus bar 40 is arranged on the bus bar fixing cylinder 60 provided on the holding body 32, and the other end 41 of the bus bar 42 is placed on the bus bar fixing portion 54 provided on the holding body 32. The end 43 is arranged.

Next, prepare the board wall portion 34 and the connector 36. More specifically, the connector 36 is configured by press-fitting the tip ends of the pair of connecting

members

100, 100 into the connecting member insertion holes 114 provided in the connector housing 98 (see FIG. 6). Subsequently, the rear end portions of the pair of connecting

members

100, 100 of the connector 36 are inserted into the plate wall through hole 90 of the plate wall portion 34 from the front side of the plate wall portion 34. In this state, the bolt insertion holes 104 provided at the four corners of the fixing portion 102 of the connector 36 are overlapped with the bolt insertion holes 96 of the connector fixing cylinder portion 94 of the plate wall portion 34, and then fixed by bolting. As a result, the outer peripheral surface of the tubular portion 112 of the connector housing 98 is in contact with or close to the inner peripheral surface of the tubular portion 92 of the plate wall portion 34 (see FIG. 6). As a result, as shown in FIG. 6, for example, the connecting member 100 is held by the plate wall portion 34 and projects to both sides of the plate wall portion 34 in the plate thickness direction. Then, among the connecting members 100 of the connector 36, the external connecting portion 100a is formed by the protruding end portion of the plate wall portion 34 on the first surface 78 side, and the second surface 82 on the side opposite to the first surface 78 of the plate wall portion 34. The circuit-side connector 100b is configured by the protruding end portion to the side. Further, for example, as shown in FIG. 1, the connector 36 has a hood portion 108 that surrounds the outer side connecting portion 100a and projects toward the first surface 78 side (left side in FIG. 6).

Then, the other end 41 of the bus bar 40 held by the holding body 32, together with the circuit side connecting portion 100b provided on the pair of connecting

members

100, 100 of the connector 36, is connected to the bus bar fixing cylinder portion of the holding body 32. It is bolted to 60 and fixed, and electrically connected. As a result, the plate wall portion 34 is fixed to the holding body 32, and the circuit unit 10 in the vehicle-mounted electric component is completed.

Next, the in-vehicle electric component internal circuit unit 10 in which the circuit-side connection portion 100b of the connector 36 is connected to the bus bar 40 that constitutes the circuit member held by the holding body 32 as described above constitutes the in-vehicle electric component 118. Assemble to the upper cover 122. First, the plate wall portion 34 assembled to the connector 36 is assembled from the inside of the upper cover 122 of the vehicle-mounted electric component 118. At this time, the hood portion 108 of the connector 36 of the circuit unit 10 in the vehicle-mounted electric component is passed through the housing through hole 148 from the inside of the upper cover 122. After that, the bolt insertion hole 80 provided in the board wall portion 34 and the bolt insertion hole 150 provided in the upper cover 122 are aligned and bolted, so that the board wall portion 34 is bolted to the housing through hole 148 of the upper cover 122. Can be assembled with the cover covered from the inner surface side. As a result, the annular seal member 88 provided on the first surface 78, which is a surface to be superposed on the upper cover 122 constituting the housing 124 of the plate wall portion 34, comes into contact with the peripheral edge of the housing through hole 148. It is sandwiched between the plate wall portion 34 and the peripheral edge of the housing through hole 148. Subsequently, the case fixing cylinder storage recesses 50 in the upper case fixing portions 46 provided at the four corners of the holding body 32 are fixed to the case formed on the back surface of the top surface 52 of the upper cover 122 of the in-vehicle electric component 118. It is fitted into the cylinder portion 154, and the holding body 32 is fixed to the upper cover 122 of the vehicle-mounted electric component 118 by fastening bolts (see FIGS. 2 to 4 and 6). As a result, the heat transfer surface 28 of the lower case 24 constituting the holding body 32 is directed to the back surface of the top surface 52 of the upper cover 122 constituting the housing 124 via the heat transfer sheet 30 attached to the heat transfer surface 28. And heat contact.

The bolt insertion hole 130 of the lower cover flange portion 128 of the lower cover 120 is overlapped with the bolt insertion hole 144 of the upper cover flange portion 142 of the upper cover 122 configured in this manner and bolted. Finally, through the work hole 158, the other end 43 of the bus bar 42 is bolted and fixed together with a connecting member (not shown) provided in the wire harness 140 connected to the power supply 12, and electrically connected. .. Then, the work hole 158 is covered with the lid portion 166, the bolt insertion hole 168 of the lid portion 166 is positioned with respect to the bolt insertion hole 160 of the work hole 158, and then bolted and fixed. As a result, the seal 164 is sandwiched and adhered between the lid portion 166 and the top surface 152 of the upper cover 122 to provide waterproofing. As a result, the in-vehicle electric component internal circuit unit 10 housed in the housing 124 of the in-vehicle electric component 118 is completed.

According to the in-vehicle electric component internal circuit unit 10 of the present disclosure having such a structure, the board wall portion 34 is assembled in a state where the housing through hole 148 of the upper cover 122 is covered from the inner surface side, and the board wall portion 34 is assembled. A connector 36 is attached to the connector 36. In this state, the circuit-side connection portion 100b of the connection member 100 of the connector 36 protruding toward the second surface 82 side of the plate wall portion 34 is connected to the bus bar 40 constituting the circuit member. Therefore, the connector 36 can be a component on the circuit unit 10 side in the vehicle-mounted electric component. Moreover, before mounting the circuit unit 10 in the vehicle-mounted electric component on the housing 124 of the vehicle-mounted electric component 118, the circuit-side connection portion 100b of the connector 36 and the bus bar 40 can be connected in advance. As a result, it is not necessary to connect the connector 36 and the bus bar 40 in a narrow space after the holding body 32 and the connector 36 are attached to the housing 124 of the in-vehicle electric component 118, so that the connection workability is improved. be able to.

Further, the holding body 32 has a heat transfer surface 28 that is in thermal contact with the housing 124, and the upper cover 122 that constitutes the housing 124 via the heat transfer sheet 30 attached to the heat transfer surface 28. The lower case 24 and the upper cover 122 are in pressure contact with each other with respect to the back surface of the top surface 52 of the above (see FIG. 5). As a result, the heat generated in the holding body 32 can be transferred to the housing 124 via the heat transfer surface 28, and the heat dissipation of the circuit unit 10 in the vehicle-mounted electric component can be improved. Therefore, the need to select a material having high heat resistance is reduced, and the degree of freedom in selecting the members constituting the circuit unit 10 in the vehicle-mounted electric component is improved, so that the cost can be reduced. Further, by fixing the circuit unit 10 in the vehicle-mounted electric component to the top surface 152 of the upper cover 122, a large vertical gap between the power distribution component 126 arranged on the lower cover 120 side and the circuit unit 10 in the vehicle-mounted electric component is secured. can do. As a result, the heat dissipation of the circuit unit 10 in the in-vehicle electric component can be further improved. Moreover, by interposing the heat conductive sheet 30 between the heat transfer surface 28 and the housing 124, the contact area between the heat transfer surface 28 and the housing 124 can be secured more stably, so that the heat dissipation is further improved. Can be planned. In addition, since the heat conductive sheet 30 has elasticity, the adhesion between the heat transfer surface 28 of the holding body 32, the heat conductive sheet 30, and the heat conductive sheet 30 and the housing 124 can be improved. As a result, the heat transfer surface 28 of the holding body 32 can be reliably brought into contact with the housing 124 via the heat conductive sheet 30. Further, since the heat conductive sheet 30 is in the form of a sheet, it is easy to handle.

In addition, the first surface 78 of the plate wall portion 34 that holds the connector 36 is provided with an annular seal member 88 that contacts the peripheral edge of the through hole that contacts the peripheral edge of the housing through hole 148, and the holding body 32. Is fixed to the housing 124, the plate wall portion 34 covers the housing through hole 148, and the seal member 88 comes into contact with the peripheral edge of the housing through hole 148 from the inside of the housing 124. As a result, it is possible to provide a configuration in which the connector 36 connected to the bus bar 40 projects to the outside of the housing 124 while maintaining the waterproofness of the housing through hole 148.

Further, the connector 36 has a hood portion 108 protruding toward the first surface 78 side of the plate wall portion 34, and an external connection portion 100a is arranged in the hood portion 108. Therefore, a connector 36 capable of stably connecting to an external mating connector can be provided on the board wall portion 34 (see FIG. 5).

<Other embodiments>
The techniques described herein are not limited to the embodiments described above and in the drawings, and for example, the following embodiments are also included in the technical scope of the techniques described herein.

(1) In the present embodiment, the vehicle-mounted electric component 118 in which the power distribution component 126 and the circuit unit 10 in the vehicle-mounted electric component of the present disclosure are housed inside the housing 124 has been described as an example. Not limited to. The in-vehicle electric component 118 may be, for example, a battery pack containing a battery instead of the power distribution component 126. In this case, it is not necessary to provide the wire harness insertion hole 136 in the housing 124.

(2) In the present embodiment, a control circuit for controlling ON / OFF of the relay 16 as the power distribution component 126 has been described as an example, but the present invention is not limited to this. Any circuit such as a DCDC converter can be adopted as the power distribution component 126.

(3) In the present embodiment, a bus bar in which a circuit-side connecting portion 100b is integrally provided as a connecting member 100 of the connector 36 has been described as an example, but the description is not limited thereto. The connecting member 100 of the connector 36 may be composed of a covered electric wire having a circuit-side connecting portion at one end and an external connecting portion at the other end.

(4) In the present embodiment, the plate wall portion 34 is fixed to the holding body 32 by connecting the circuit-side connecting portion 100b of the connector 36 to the bus bar 40, but the present invention is not limited to this. For example, it may be fixed to the holding body 32 via another connecting member.

(5) In the present embodiment, the heat conduction sheet 30 has been described as an example of the heat transfer member, but the present invention is not limited to this. Amorphous materials such as heat conductive grease can also be used.

(6) A long hole shape that becomes long in the direction (X direction) in which the bolt insertion hole provided in the circuit side connection portion 100b of the connection member 100 constituting the connector 36 is superposed on the housing 124 of the plate wall portion 34 and attached. It may be. As a result, in addition to the absorption of the assembly tolerance in the Y direction and the Z direction by the annular seal member 88, the assembly tolerance in the X direction can also be absorbed.

10 In-vehicle electric component internal circuit unit 10a In-vehicle electric component internal circuit unit 10b In-vehicle electric component internal circuit unit 12 Power supply 14 Load 16 Relay 18 Precharge resistance 20 Precharge relay 22 Precharge circuit 24 Lower case 26 Upper case 28 Heat transfer surface 30 Heat Conduction sheet (heat transfer member)
32 Holder 34 Plate wall 36 Connector 38a Connection 38b Connection 40 Bus bar 41 Opposite end 42 Bus bar 43 Opposite end 46 Upper case fixing 48 Bolt insertion hole 50 Case fixing cylinder Storage recess 52 Top Surface 54 Bus bar fixing part 56 Bottom surface 58 Bolt insertion hole 60 Bus bar fixing cylinder part 62 Bolt insertion hole 64 Relay fixing cylinder part 66 Bolt insertion hole 68 Precharge resistance mounting part 70 Precharge relay mounting part 72 Relay body 74 Leg part 76 Bolt insertion hole 78 1st surface 80 Bolt insertion hole 82 2nd surface 84 Plate wall part fixing cylinder part 86 Seal member storage groove 88 Seal member 90 Plate wall through hole 92 Cylindrical part 94 Connector fixing cylinder part 96 Bolt insertion hole 98 Connector Housing 100 Connection member 100a External connection part 100b Circuit side connection part 102 Fixing part 104 Bolt insertion hole 106 Front surface 108 Hood part 110 Rear surface 112 Cylindrical part 114 Connection member insertion hole 118 In-vehicle electrical component 120 Lower cover 122 Upper cover 124 Housing 126 Power distribution components 128 Lower cover flange 130 Bolt insertion hole 132 Lower cover fixing cylinder 133 Seal 134 Peripheral wall 136 Wire harness insertion hole 138 Grommet 140 Wire harness 142 Upper cover Flange 144 Bolt insertion hole 146 Bolt insertion hole 148 Housing through hole 150 Bolt insertion hole 152 Top surface 154 Case fixing cylinder 156 Bolt insertion hole 158 Work hole 160 Bolt insertion hole 162 Seal storage recess 164 Seal 166 Lid 168 Bolt insertion hole

Claims

An insulating retainer that holds circuit members and
A plate wall portion that covers a housing through hole provided in the housing of an in-vehicle electric component, and a plate wall portion.
A connector having a connecting member held by the plate wall portion and projecting on both sides of the plate wall portion in the plate thickness direction,
An annular sealing member provided on the first surface of the plate wall portion, which is a surface to be attached to the housing, and which comes into contact with the peripheral edge of the housing through hole.
The connection member has a circuit-side connection portion provided at a protruding end portion of the plate wall portion on the side opposite to the first surface side toward the second surface side, and the circuit-side connection portion is connected to the circuit member. Has been done
The holding body has a heat transfer surface that is in thermal contact with the housing, and the holding body is fixed to the housing in a state where the heat transfer surface is in thermal contact with the housing. And
With the holding body fixed to the housing, the plate wall portion covers the housing through hole so that the sealing member comes into contact with the peripheral edge of the housing through hole from the inside of the housing. Has become
Circuit unit in an in-vehicle electric component.
The circuit unit in an in-vehicle electric component according to claim 1, wherein the heat transfer surface of the holding body is in thermal contact with the housing via a heat conductive member.
The circuit unit in an in-vehicle electric component according to claim 2, wherein the heat conductive member is a heat conductive sheet that can be flexed and deformed.
The connecting member of the connector has an external connecting portion provided at a protruding end portion of the plate wall portion on the first surface side.
The circuit unit in an in-vehicle electric component according to any one of claims 1 to 3, wherein the connector has a hood portion that surrounds the periphery of the external connection portion and projects toward the first surface side.