In-vehicle electrical equipment

Abstract

To provide an on-vehicle electric device which enables effective cooling of electronic components mounted on a substrate housed in a case of the on-vehicle electric device while securing mountability of the on-vehicle electric device.SOLUTION: An on-vehicle electric device of the disclosure includes: a substrate on which at least one electronic component is mounted; a case which houses the substrate; a substrate support part which is provided at the case so as to support the substrate and is naturally cooled or forcibly cooled; a facing part which is provided at the case so as to face the substrate support part while spaced apart therefrom; and a pressing mechanism which is supported by the facing part and presses the electronic component of the substrate supported by the substrate support part or the substrate to the substrate support part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an in-vehicle electric device that includes a board on which at least one electronic component is mounted and a case that houses the board. [Background technology]

[0002] Conventionally, there is known a cooling structure that uses a cooling fluid to cool heat generating devices such as batteries, DC voltage converters, and relays, each of which is formed in a plate shape (see, for example, Patent Document 1). This cooling structure includes a heat exchange member and a spring member. The heat exchange member forms flat device accommodating spaces in which the heat generating devices are accommodated and flat cooling passages alternately in the plate thickness direction of the heat generating devices. The spring member generates a spring force in a direction that presses the heat generating devices and the heat exchange member together. This makes it possible for the cooling fluid passing through the cooling passage to remove heat from both sides of each heat generating device via the heat exchange member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-216303 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an in-vehicle electrical device including a board on which electronic components are mounted and a case that houses the board, it would be possible to use a leaf spring (spring member) to press the electronic components or the board against the surface of the case to release heat from the electronic components to the case. However, in order to press the electronic components or the board against the case with a leaf spring, bosses or the like for supporting the leaf spring must be formed on the case so as to be positioned around the electronic components. The addition of the bosses or the like increases the size of the case, which makes it difficult to mount the in-vehicle electrical device.

[0005] Therefore, a main object of the present disclosure is to ensure the mountability of an in-vehicle electrical device while enabling good cooling of electronic components mounted on a board housed within a case of the in-vehicle electrical device. [Means for solving the problem]

[0006] The automotive electrical equipment disclosed herein includes a board on which at least one electronic component is mounted and a case that houses the board, and is installed in a vehicle.The automotive electrical equipment includes a board support portion that is provided in the case to support the board and is naturally or forcibly cooled, an opposing portion that is provided on the case to face the board support portion at a distance, and a pressing mechanism that is supported by the opposing portion and presses the electronic component of the board or the board supported by the board support portion against the board support portion.

[0007] In the in-vehicle electrical equipment disclosed herein, it is possible to ensure mountability by suppressing an increase in the size of the case, i.e., the area of ​​the board support portion, while providing good cooling for the electronic components mounted on the board housed within the case. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing a vehicle equipped with an on-board electrical device according to the present disclosure; [Diagram 2] 1 is a partial cross-sectional view showing an in-vehicle electrical device according to the present disclosure. [Diagram 3] 2 is an enlarged view showing a main part of the in-vehicle electrical device according to the present disclosure. [Figure 4] 11 is an enlarged view showing a main portion of another on-vehicle electrical device according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Next, an embodiment of the present disclosure will be described with reference to the drawings.

[0010] FIG. 1 is a schematic diagram showing an electric vehicle (BEV) 1, which is an electrically powered vehicle equipped with a power supply unit (hereinafter referred to as "ESU") 10 as an on-board electrical device according to the present disclosure. In addition to the ESU 10, the electric vehicle 1 shown in the figure includes a battery (high voltage battery) 3, a system main relay SMR, a power control device (hereinafter referred to as "PCU") 4, and a motor generator MG. In this embodiment, the electric vehicle 1 is a front-wheel drive vehicle. However, the electric vehicle 1 may also be a rear-wheel drive vehicle or a four-wheel drive vehicle.

[0011] The battery 3 includes a plurality of battery modules (battery stacks) connected in series, and a battery case that houses the plurality of battery modules. The battery 3 is mounted, for example, under the floor (below the floor panel) of the electric vehicle 1 near the rear seats. Each battery module of the battery 3 includes a plurality of battery cells (not shown) connected in series or in parallel. Each battery cell is, for example, a lithium ion secondary battery or a nickel-hydrogen secondary battery. A positive electrode side power line PL is connected to a positive electrode terminal of the battery 3 via a positive electrode side relay of the system main relay SMR. A negative electrode side power line NL is connected to a negative electrode terminal of the battery 3 via a negative electrode side relay of the system main relay SMR.

[0012] The PCU 4 is connected to the battery 3 via a positive power line PL, a negative power line NL, and a system main relay SMR. The PCU 4 includes an inverter (drive circuit) 4a that drives the motor generator MG, a boost converter 4b that can boost the power from the battery 3 and step down the voltage from the motor generator MG side, a chargeable and dischargeable capacitor (not shown), and the like.

[0013] The motor generator MG is a synchronous generator motor (three-phase AC motor). The rotor of the motor generator MG is connected to a drive shaft DS connected to driving wheels DW via a power transmission mechanism including a reduction gear and a differential gear. The motor generator MG is driven by electric power from the PCU 4 (battery 3) and outputs driving torque (driving force) to the drive shaft DS. Furthermore, the motor generator MG outputs regenerative braking torque to the drive shaft DS when braking the electric vehicle 1. In this embodiment, the motor generator MG, the reduction gear, and the differential gear are housed in a transaxle case and form a transaxle 5 together with the transaxle case.

[0014] The ESU 10 is mounted on the electric vehicle 1 to enable charging of the battery 3 with power from an AC power source 80, such as a household power source, or an external charging device (DC power source) 90, such as a quick charger installed at a stand. The ESU 10 is mounted in the front compartment of the electric vehicle 1 together with the transaxle 5. In this embodiment, the ESU 10 is fastened (fixed) to the vehicle body via a plurality of bolts so as to be located above the transaxle 5, behind a radiator (not shown), and in front of a dash panel (partition wall) (not shown).

[0015] 1, ESU 10 includes a charging control device (charging ECU) 11, an AC charger 12, charging relays CHR and DCR, a DC / DC converter 13, a filter F, a junction box JB, a bus bar unit (not shown), and a case 20 that houses these devices. Charging control device 11 is a microcomputer that includes a CPU, ROM, RAM, etc. (not shown). Charging control device 11 controls AC charger 12 and DC / DC converter 13, and also controls the opening and closing of charging relays CHR and DCR.

[0016] The AC charger 12 includes an AC / DC converter that converts AC power into DC power, a DC / DC converter that boosts the DC power output from the AC / DC converter (both are not shown), and the like. The AC / DC converter of the AC charger 12 is connected to an outlet plug 8 that can be coupled to an outlet 81 of an AC power source 80 via a connector 18 attached to a case 20 and a cable. The DC / DC converter of the AC charger 12 is also connected to a positive power line PL and a negative power line NL between a system main relay SMR and a PCU 4 via a charging relay CHR, a connector 14 attached to the case 20, and a power line. The AC charger 12 is operated with the outlet plug 8 coupled to the outlet 81 and the system main relay SMR and the charging relay CHR closed. As a result, the battery 3 is charged with power (AC power) from the AC power source 80.

[0017] The charging relay DCR is connected to the positive power line PL and the negative power line NL between the system main relay SMR and the PCU 4 via a connector 15 and a power line attached to the case 20. The charging relay DCR is also connected to a power receiving connector 9 via a connector 19 and a cable attached to the case 20. The power receiving connector 9 is connectable to a power transmitting connector 91 of an external charging device 90, and is installed on a charging lid (not shown) of the electric vehicle 1. The external charging device 90 is operated with the power transmitting connector 91 connected to the power receiving connector 9 and with the system main relay SMR and the charging relay DCR closed. As a result, the battery 3 is charged with power (DC power) from the external charging device 90.

[0018] The DC / DC converter 13 is connected to the positive power line PL and the negative power line NL between the system main relay SMR and the PCU 4 via a connector 16 and power lines attached to the case 20. The output terminal of the DC / DC converter 13 is connected to an auxiliary battery (low voltage battery) and various auxiliary devices (not shown) via a connector 17 and power lines attached to the case 20. The DC / DC converter 13 steps down the power from the positive power line PL and the negative power line NL and supplies it to the auxiliary battery and various auxiliary devices.

[0019] 2 is a partial cross-sectional view showing ESU 10. As shown in the figure, case 20 of ESU 10 includes lower case 21 in the shape of a rectangular cylinder, upper case 22 in the shape of a rectangular cylinder with a bottom, lower cover 23, and upper cover 24. In this embodiment, lower case 21 and upper case 22 are castings made of aluminum alloy or the like. Furthermore, a floor section (floor plate section) 210 is formed in the center in the height direction of lower case 21 so as to be perpendicular to the height direction. Furthermore, lower cover 23 and upper cover 24 are formed of steel plate or the like.

[0020] The upper case 22 is connected (fixed) to the upper end of the lower case 21 via a plurality of bolts (not shown). The lower cover 23 is connected (fixed) to the lower end of the lower case 21 via a plurality of bolts (not shown) to form the bottom (bottom plate) of the case 20 (lower case 21). The upper cover 24 is connected (fixed) to the upper end of the upper case 22 via a plurality of bolts (not shown) to form the ceiling (top plate) of the case 20 (upper case 22). In addition, the floor 210 of the lower case 21 faces the lower cover 23 at a distance in the vertical direction, and also faces the bottom 220 of the upper case 22, which is the floor of the case 20, at a distance in the vertical direction. Furthermore, the bottom 220 of the upper case 22 faces the upper cover 24 at a distance in the vertical direction.

[0021] In this embodiment, for example, the AC charger 12 and the like are arranged in a space A defined between the floor 210 of the lower case 21 and the lower cover 23. Furthermore, for example, the DC / DC converter 13 and the filter F and the like are arranged in a space B defined between the floor 210 of the lower case 21 and the bottom 220 of the upper case 22. Furthermore, for example, the charging control device 11 (omitted in FIG. 2), the charging relay CHR, the charging relay DCR, the junction box JB and the like are accommodated in a space C defined between the bottom 220 of the upper case 22 and the upper cover 24. Note that the charging relay CHR may be arranged outside the case 20 as indicated by the two-dot chain line in FIG. 1.

[0022] A refrigerant passage (not shown) is formed in floor 210 of case 20, and a cooling medium is circulated through the refrigerant passage by a refrigerant pump (not shown) or the like. As a result, lower case 21 (floor 210), upper case 22 (bottom 220), lower cover 23, and upper cover 24 forming case 20 are forcibly cooled by the cooling medium flowing through the refrigerant passage in floor 210. While electric vehicle 1 is traveling, lower cover 23, upper cover 24, and side plate portions of case 20 are naturally cooled by traveling wind or the like flowing into the front compartment of electric vehicle 1.

[0023] Here, the AC charger 12 and the DC / DC converter 13 of the ESU 10 each include a board S on which a plurality of electronic components P, such as semiconductor elements (e.g., FETs), are mounted. These electronic components P generate heat when the AC charger 12 and the DC / DC converter 13 are operated. Therefore, when charging the battery 3 with power from an external AC power source 80 or an external charging device 90, it is necessary to cool the electronic components P of each board S. In consideration of this, in the ESU 10, the board S of the AC charger 12 is supported by the floor 210 of the lower case 21, which is forcibly cooled, in order to release heat from each electronic component P. The board S of the DC / DC converter 13 is also supported by the floor 210 of the lower case 21, which is forcibly cooled, in order to release heat from each electronic component P. Furthermore, each board S has a plurality of openings formed therein for exposing (protruding) the electronic components P on both the front and back sides. Each electronic component P is mounted in a corresponding opening of the substrate S so as to protrude from both the front and back sides of the substrate S.

[0024] In addition, the ESU 10 includes a pressing mechanism 30 that presses a plurality of electronic components P mounted on the board S of the AC charger 12 against a floor 210 of the lower case 21 as a board support portion, and a pressing mechanism 30 that presses a plurality of electronic components P mounted on the board S of the DC / DC converter 13 against the floor 210 of the lower case 21 as a board support portion. The pressing mechanism 30 for the AC charger 12 is supported by the lower cover 23 as an opposing portion that faces the floor 210 of the lower case 21. The pressing mechanism 30 for the DC / DC converter 13 is supported by the bottom 220 of the upper case 22 as an opposing portion that faces the floor 210 of the lower case 21. In this embodiment, the pressing mechanism 30 for the AC charger 12 and the pressing mechanism 30 for the DC / DC converter 13 have a common configuration. Hereinafter, the configuration of the pressing mechanism 30 for the DC / DC converter 13 will be described in detail with reference to FIG. 3, taking the pressing mechanism 30 for the DC / DC converter 13 as an example.

[0025] As shown in FIG. 3, the pressing mechanism 30 includes a pressing member 31, a guide member 32, and a plurality of coil springs (elastic bodies) 33. The pressing member 31 has a plurality of abutting members 311 and a support member 312. Each abutting member 311 of the pressing member 31 is a round or square bar made of, for example, metal or resin. The support member 312 of the pressing member 31 is made of, for example, metal or resin. The support member 312 supports the plurality of abutting members 311 at intervals so that each tip surface (lower end surface in FIG. 3) abuts against a corresponding electronic component P of the board S supported by the floor portion 210. The plurality of abutting members 311 and the support member 312 may be formed integrally, or the plurality of abutting members 311 separate from the support member 312 may be fixed to the support member 312.

[0026] The guide member 32 is, for example, a metal or resin plate having a plurality of holes formed at intervals. The guide member 32 is fixed to a plurality of bosses 221 (for example, two in this embodiment) extending from the bottom 220 of the upper case 22 toward the floor 210 of the lower case 21 by a plurality of bolts 34 (for example, two in this embodiment). Each abutting member 311 of the pressing member 31 is slidably inserted into the corresponding hole of the guide member 32 so that the support member 312 is positioned between the guide member 32 and the bottom 220 of the upper case 22. The guide member 32 of the pressing mechanism 30 for the AC charger 12 is fixed to a plurality of bosses extending from the lower cover 23 toward the floor 210 by a plurality of bolts 34.

[0027] The coil springs 33 have the same specifications. Each coil spring 33 is supported by an elastic body support portion 222 formed on the bottom portion 220 of the upper case 22 and is connected to a support member 312 of the pressing member 31. In this embodiment, the elastic body support portion 222 of the bottom portion 220 has a plurality of recesses that open to the floor portion 210 (lower side in the figure) of the lower case 21 so as to face the end portion (upper end portion in FIG. 3) of the corresponding abutting member 311 of the pressing member 31. In addition, the support member 312 of the pressing member 31 has a plurality of recesses that open to the bottom portion 220 (upper side in the figure) of the upper case 22 so as to face the end portion (upper end portion in FIG. 3) of the corresponding abutting member 311 of the pressing member 31. One end (upper end portion in FIG. 3) of each coil spring 33 is fitted into the corresponding recess formed in the elastic body support portion 222. Also, the other end (the lower end in FIG. 3) of each coil spring 33 is fitted into a corresponding recess formed in the support member 312 of the pressing member 31. That is, each coil spring 33 is disposed between the elastic body support portion 222 of the bottom portion 220 and the support member 312 of the pressing member 31 so as to face the end portion on the bottom portion 220 side of the corresponding contact member 311.

[0028] As a result, the pressing member 31, i.e., the multiple abutment members 311, are slidably supported by the bottom 220 of the upper case 22 via the guide members 32 so as to abut against the corresponding electronic components P. When each coil spring 33 is in its natural state, the distance (shortest distance) from the surface (lower surface in FIG. 3) of the elastic body support portion 222 (bottom portion 220) on the floor 210 side to the tip surface (lower end surface in FIG. 3) of each abutment member 311 is longer than the distance (shortest distance) from the surface of the elastic body support portion 222 on the floor 210 side to each electronic component P of the board S supported by the floor 210. Each coil spring 33 of the pressing mechanism 30 for the AC charger 12 is supported by an elastic body support portion formed on the lower cover 23 and is connected to the support member 312 of the pressing member 31.

[0029] When manufacturing the ESU 10 as described above, the pressing mechanism 30 for the AC charger 12 is attached to the lower cover 23 so as to be located on the space A side. Furthermore, the components of the AC charger 12, including the board S, are attached to the floor 210 (the lower surface in FIG. 2) of the lower case 21 so as to be located on the space A side. Furthermore, the components of the DC / DC converter 13, including the board S, and the filter F are attached to the floor 210 (the upper surface in FIG. 2) of the lower case 21 so as to be located on the space B side. Furthermore, the charging control device 11, the charging relay CHR, the charging relay DCR, the junction box JB, and the like are attached inside the upper case 22 (on the bottom 220). Furthermore, the pressing mechanism 30 for the DC / DC converter 13 is attached to the bottom 220 (the lower surface in FIG. 2) of the upper case 22 so as to be located on the space B side.

[0030] Furthermore, when the lower cover 23 is fixed to the lower case 21, the pressing member 31, i.e., each abutting member 311, of the pressing mechanism 30 for the AC charger 12 abuts against the corresponding electronic component P of the board S supported by the floor portion 210 of the lower case 21. As a result, the pressing member 31 presses each coil spring 33 and compresses it between the support member 312 and the lower cover 23 (an elastic body support portion not shown), so that the pressing member 31 is biased toward the floor portion 210 by each coil spring 33. Therefore, each electronic component P of the board S supported by the floor portion 210 is pressed against the floor portion 210 by the corresponding abutting member 311 of the pressing member 31.

[0031] Furthermore, when the upper case 22 is fixed to the lower case 21, the pressing member 31 of the pressing mechanism 30 for the DC / DC converter 13, i.e., each abutting member 311, comes into contact with the corresponding electronic component P of the board S supported by the floor portion 210 of the lower case 21. As a result, each coil spring 33 is pressed by the pressing member 31 and compressed between the support member 312 and the bottom portion 220 (elastic body support portion 222), and the pressing member 31 is urged toward the floor portion 210 by each coil spring 33. Therefore, each electronic component P of the board S supported by the floor portion 210 is pressed against the floor portion 210 by the corresponding abutting member 311 of the pressing member 31.

[0032] As a result, in the electric vehicle 1, when the battery 3 is charged by power from the external AC power source 80 or the external charging device 90, it is possible to release heat from each electronic component P mounted on the board S of the AC charger 12 to the floor 210 of the case 20, which is forcibly cooled (naturally cooled in some cases). Furthermore, a part of the heat from each electronic component P mounted on the board S of the AC charger 12 is also released to the lower cover 23, which is naturally or forcibly cooled, via the pressing member 31 and each coil spring 33. Furthermore, when the battery 3 is charged by power from the external AC power source 80 or the external charging device 90, it is possible to release heat from each electronic component P mounted on the board S of the DC / DC converter 13 to the floor 210 of the case 20, which is forcibly cooled (naturally cooled in some cases). Furthermore, a part of the heat from each electronic component P mounted on the board S of the DC / DC converter 13 is also released to the bottom 220 of the upper case 22, which is naturally or forcibly cooled, via the pressing member 31 and each coil spring 33.

[0033] In the ESU 10, each pressing mechanism 30 is supported by a bottom (facing portion) 220 of the upper case 22 facing the floor portion 210 supporting the board S, or a lower cover (facing portion) 23 facing the floor portion 210. This eliminates the need to form a structure such as a boss portion supporting a leaf spring for pressing the electronic component P or the board S against the floor portion 210 on the floor portion 210 so as to be located around the target electronic component P. As a result, it is possible to suppress an increase in the size of the case 20, i.e., the area of ​​the floor portion (board support portion) 210, and ensure the mountability of the ESU 10, while at the same time making it possible to satisfactorily cool the electronic component P mounted on the board S accommodated in the case 20 when charging the battery 3 with power from the AC power source 80 or the external charging device 90.

[0034] The pressing mechanism 30 includes a pressing member 31 disposed between the floor 210 and the bottom 220 of the upper case 22 or between the floor 210 and the lower cover 23 so as to abut against the electronic component P of the board S supported by the floor 210, and a coil spring 33 disposed between the bottom 220 or the lower cover 23 and the pressing member 31 to bias the pressing member 31 toward the floor 210. This allows the pressing member 31 biased by the coil spring 33 to press the electronic component P against the floor 210, so that it is possible to release heat from the electronic component P to the floor 210, which is forcibly cooled (or naturally cooled), while suppressing an increase in the axial length (size increase) of the coil spring 33. In addition, according to the pressing mechanism 30, as described above, the heat from the electronic component P can also be released to the bottom 220 of the upper case 22 or the lower cover 23 via the pressing member 31 and the coil spring 33.

[0035] Furthermore, the pressing mechanism 30 includes a guide member 32 that is supported by the bottom 220 of the upper case 22 or the lower cover 23 and slidably supports the pressing member 31 so as to abut against the electronic component P. This prevents the pressing member 31 from falling off the case 20 (upper case 22 or lower cover 23) during manufacturing or disassembly of the ESU 10, and enables each abutment member 311 of the pressing member 31 to be accurately abutted against the corresponding electronic component P.

[0036] Furthermore, in the ESU 10, each electronic component P is mounted on the board S so as to be exposed on both the front side (the bottom 220 or lower cover 23 side) and the back side (the floor 210 side) of the board S. This allows the pressing mechanism 30 to bring the electronic component P into close contact with the floor 210, making it possible to more effectively cool the electronic component P when charging the battery 3 with power from the external AC power source 80 or the external charging device 90.

[0037] Furthermore, a plurality of electronic components P are mounted on the board S of the AC charger 12 and the board S of the DC / DC converter 13. Furthermore, the pressing member 31 of each pressing mechanism 30 includes a plurality of abutting members 311 that can abut against corresponding electronic components P of the board S supported by the floor portion 210. Furthermore, each pressing mechanism 30 includes a support member 312 that supports the plurality of abutting members 311 at intervals so that they abut against the corresponding electronic components P. Furthermore, the plurality of coil springs 33 of each pressing mechanism 30 are disposed between the floor portion 210 and the bottom portion 220, or between the floor portion 210 and the lower cover 23. This makes it possible to suppress an increase in the size of the case 20 and ensure the mountability of the ESU 10, while efficiently cooling the plurality of electronic components P mounted on the board S housed in the case 20.

[0038] Furthermore, each coil spring 33 of the pressing mechanism 30 is disposed between the bottom 220 or the lower cover 23 and the support member 312 of the pressing member 31 so as to face the end of the corresponding abutment member 311 of the pressing member 31 on the bottom 220 side or the lower cover 23 side. This makes it possible to transmit the biasing force from each coil spring 33 to each abutment member 311 of the pressing member 31 stably and efficiently.

[0039] Furthermore, the pressing mechanism 30 includes a plurality of coil springs 33 as elastic bodies that bias the pressing member 31. This makes it possible to reduce the effect of variations in the distance between the bottom 220 or the lower cover 23 and each of the electronic components P on the load applied from each coil spring 33 to the plurality of electronic components P via the pressing member 31.

[0040] The elastic body for biasing the pressing member 31 is not limited to the coil spring 33. That is, as in the pressing mechanism 30B shown in FIG. 4, the multiple coil springs 33 may be replaced with multiple leaf springs 330. In the pressing mechanism 30B, the influence of the variation in the distance between the floor 210 or the bottom 220 and each electronic component P on the load applied from each coil spring 33 to the multiple electronic components P via the pressing member 31 can also be reduced. The pressing mechanisms 30 and 30B may include a single coil spring 33 or leaf spring 330 as an elastic body for biasing the pressing member 31. Furthermore, the coil spring 33 or leaf spring 330 may be formed integrally with the elastic body support portion 222 or the support member 312. Furthermore, the support member 312 may be omitted from the pressing mechanisms 30 and 30B, and the coil spring 33 or leaf spring 330 may be fixed or integrated to the end of the pressing member 31.

[0041] In the ESU 10, the pressing mechanism 30 for the AC charger 12 is supported by the lower cover 23, and the pressing mechanism 30 for the DC / DC converter 13 is supported by the bottom 220 of the upper case 22, but is not limited thereto. That is, when the board S of the AC charger 12 is supported by the lower cover 23, the pressing mechanisms 30 and 30B for the AC charger 12 may be supported by the floor 210 of the lower case 21. When the board S of the DC / DC converter 13 is supported by the bottom 220 of the upper case 22, the pressing mechanisms 30 and 30B may be supported by the floor 210 of the lower case 21. Furthermore, when the board S is supported by the bottom (board support portion) 220 of the upper case 22 so as to be located in the space C, the pressing mechanisms 30 and 30B may be supported by the upper cover (opposing portion) 24 which serves as the ceiling portion of the case 20. Furthermore, when the substrate S is supported by the upper cover (substrate support portion) 24 so as to be located within the space C, the pressing mechanisms 30, 30B may be supported by the bottom portion (opposing portion) 220 of the upper case 22 which serves as the floor portion of the case 20.

[0042] Furthermore, in the ESU 10, the floor 210 and the bottom 220 may be omitted from the case 20. In this case, the pressing mechanisms 30 and 30B may be supported by the upper cover (opposing portion) 24 so as to press the electronic components P of the board S supported by the lower cover (board support portion) 23 against the lower cover 23, or may be supported by the lower cover (opposing portion) 23 so as to press the electronic components P of the board S supported by the upper cover (board support portion) 24 against the upper cover 24. Furthermore, the pressing mechanisms 30 and 30B may be supported by equipment or members (opposing portions) that are held by the case 20 and become a part of the case 20 so as to face the floor 210 or the like that supports the board S. Furthermore, the board S may be supported by a side plate portion of the case 20, and the pressing mechanisms 30 and 30B may be supported by a part of the case 20 that faces the side plate portion or by equipment or the like supported by the case 20 that faces the side plate portion.

[0043] Furthermore, the pressing member 31 (contact member 311) of the pressing mechanisms 30, 30B may be formed to contact the front surface of the board S instead of the electronic component P, and the pressing member 31 may have only one contact member 311. Furthermore, the axial lengths of the multiple contact members 311 in the pressing member 31 may be made different from one another depending on the heights of the multiple electronic components P on the board S, etc. Furthermore, the opening may be omitted from the board S, and the electronic component P may be mounted on the front or back surface of the board S.

[0044] Furthermore, the pressing mechanism 30 is applied to an ESU 10 for charging the battery 3 with power from an AC power source 80 or an external charging device 90, but is not limited to this. That is, the pressing mechanism 30 may be applied to a board such as an inverter or a boost converter of the PCU 4. Furthermore, the ESU 10 is mounted on an electric vehicle 1 including a battery 3 that can be charged with power from an AC power source 80 and an external charging device 90, but is not limited to this. That is, the ESU 10 may be mounted on a non-plug-in hybrid vehicle (HEV) or a plug-in hybrid vehicle (PHEV).

[0045] As described above, the in-vehicle electrical equipment of the present disclosure includes a board (S) on which at least one electronic component (P) is mounted, and a case (20) that houses the board (S), and in the in-vehicle electrical equipment (10) that is mounted on a vehicle (1), the in-vehicle electrical equipment includes a board support part (210) that is provided in the case (20) to support the board (S) and is naturally or forcibly cooled, an opposing part (220, 23) that is provided on the case (20) to face the board support part (210) at a distance, and a pressing mechanism (30, 30B) that is supported by the opposing part (220, 23) and presses the electronic component (P) of the board (S) supported by the board support part (210) or the board (S) against the board support part (210).

[0046] The case of the vehicle-mounted electrical device of the present disclosure includes a board support part that supports a board and is naturally or forcibly cooled, and an opposing part that faces the board support part at a distance. Furthermore, the opposing part supports a pressing mechanism, and the pressing mechanism presses the electronic components of the board supported by the board support part or the board against the board support part. This allows the pressing mechanism to press the electronic components or the board against the board support part, and to release heat from the electronic components against the board support part that is naturally or forcibly cooled. Furthermore, in the vehicle-mounted electrical device of the present disclosure, since the pressing mechanism is supported by the opposing part, it is not necessary to form a structure for pressing the electronic components or the board against the board support part in the board support part so as to be located in the vicinity of the electronic components to be pressed. As a result, it is possible to suppress an increase in the size of the case, i.e., the area of ​​the board support part, to ensure the mountability of the vehicle-mounted electrical device, while effectively cooling the electronic components mounted on the board accommodated in the case.

[0047] In addition, the pressing mechanism (30, 30B) may include a pressing member (31) arranged between the board support portion (210) and the opposing portion (220, 23) so as to abut against the electronic component (P) of the board (S) supported by the board support portion (23, 210, 220) or the board (S), and an elastic body (33, 330) arranged between the opposing portion (220, 23) and the pressing member (31) for biasing the pressing member (31) toward the board support portion (210).

[0048] As a result, the electronic component or the board can be pressed against the board support part by the pressing member biased by the elastic body, so that it is possible to suppress an increase in size of the elastic body and to release heat from the electronic component to the board support part that is naturally or forcibly cooled. In addition, with this pressing mechanism, heat from the electronic component can also be released to the opposing part of the case via the pressing member and the elastic body.

[0049] Furthermore, the pressing mechanism (30, 30B) may include a guide member (32) that is supported by the opposing portion (220, 23) and supports the pressing member (31) slidably so as to abut against the electronic component (P) or the board (S).

[0050] This makes it possible to prevent the pressing member from falling off the case when the in-vehicle electrical equipment is manufactured or disassembled, and also makes it possible to bring the pressing member into contact with the corresponding electronic component with high precision.

[0051] The electronic component (P) may be mounted on the substrate (S) so as to be exposed from the substrate (S) to both the opposing portion (220, 23) side and the substrate support portion (210) side.

[0052] This allows the electronic component to be brought into close contact with the board support portion by the pressing mechanism, making it possible to cool the electronic component more effectively.

[0053] Furthermore, a plurality of the electronic components (P) may be mounted on the board (S), and the pressing member (31) may include a plurality of abutment members (311) capable of abutting against corresponding electronic components (P) of the board (S) supported by the board support portion (210), and the pressing mechanism (30, 30B) may include a support member (312) supporting the plurality of abutment members (311) at intervals so as to abut against the corresponding electronic components (P), and a plurality of the elastic members (312) may be provided between the facing portion (220, 23) and the support member (312). body (33,330) may be placed.

[0054] This makes it possible to suppress an increase in the size of the case and ensure the mountability of in-vehicle electrical equipment, while also making it possible to effectively cool a number of electronic components mounted on a board housed within the case.

[0055] In addition, the multiple elastic bodies (33, 330) may be arranged between the opposing portion (220, 23) and the support member (312) so as to face the end portion of the corresponding contact member (311) on the opposing portion (220, 23) side.

[0056] This makes it possible to transmit the biasing force from the elastic body to each contact member stably and efficiently.

[0057] Furthermore, the elastic body may be a coil spring (33).

[0058] This makes it possible to reduce the effect of variations in the distance between the facing portion and the electronic component or the board on the load applied from the elastic body via the pressing member to the electronic component or the board.

[0059] The elastic body may also be a leaf spring (330).

[0060] In this embodiment as well, it is possible to reduce the effect of variations in the distance between the facing portion and the electronic component or the board on the load applied from the elastic body via the pressing member to the electronic component or the board.

[0061] Furthermore, the substrate support portion may be the bottom portion (23) of the case (20), the floor portion (210, 220) of the case located above the bottom portion (23), or the ceiling portion (24) of the case, and the opposing portion may be the bottom portion (23), the floor portion (210, 220) or the ceiling portion (24) of the case (20) that faces the substrate support portion in the vertical direction.

[0062] In addition, the vehicle (1) may be an electric vehicle (1) including an electric motor (MG) that outputs driving force to wheels (DW) and a battery (3) that supplies power to the electric motor (MG), and the substrate (S) may constitute equipment (10) used to charge the battery (3) with power from an external power source (80, 90).

[0063] This makes it possible to effectively cool electronic components when the battery of the electric vehicle is charged with electric power from an external power source.

[0064] The present disclosure is not limited to the above embodiment, and various modifications can be made within the scope of the present disclosure. Furthermore, the above embodiment is merely a specific form of the invention described in the Summary of the Invention, and does not limit the elements of the invention described in the Summary of the Invention. [Industrial Applicability]

[0065] The present disclosure is applicable to the manufacturing industry of in-vehicle electrical equipment, etc. [Explanation of symbols]

[0066] 1 electric vehicle, 3 battery, 4 power control device (PCU), 10 power supply unit (ESU), 11 charging control device, 12 AC charger, 13 DC / DC converter, 20 case, 21 lower case, 210 floor, 22 upper case, 220 bottom, 221 boss, 222 elastic support, 23 lower cover, 24 upper cover, 30, 30B pressing mechanism, 31 pressing member, 311 contact member, 312 support member, 32 guide member, 33 coil spring, 330 leaf spring, 34 volts, 80 AC power source, 90 external charging device, CHR, DCR charging relay, MG motor generator.

Claims

1. An in-vehicle electrical device that includes a substrate on which a plurality of electronic components are mounted and a case that houses the substrate, the in-vehicle electrical device being configured to be mounted on a vehicle, a substrate support portion provided in the case to support the substrate, the substrate support portion being naturally or forcibly cooled; a facing portion provided on the case so as to face the substrate support portion at a distance; a pressing mechanism that is supported by the facing portion and presses the electronic component of the board or the board supported by the board support portion against the board support portion; Equipped with The pressing mechanism includes: a pressing member including a plurality of contact members each capable of contacting a corresponding one of the electronic components of the board supported by the board support portion, and a support member supporting the plurality of contact members at intervals so as to contact the corresponding one of the electronic components, and disposed between the board support portion and the facing portion; a plurality of elastic bodies disposed between the opposing portion and the support member and biasing the pressing member toward the substrate support portion; a guide member supported by the opposing portion so as to be positioned between the support member and the board support portion, and which slidably supports the multiple abutment members of the pressing member so as to abut against the electronic components.

2. The vehicle-mounted electrical device according to claim 1, The electronic component is mounted on the board so as to be exposed from the board to both the opposing portion side and the board support portion side.

3. The in-vehicle electrical device according to claim 1 or 2, The plurality of elastic bodies are disposed between the opposing portion and the support member so as to face the end portions of the corresponding contact members on the opposing portion side of the in-vehicle electrical equipment.

4. 3. The on-vehicle electrical device according to claim 1, wherein the elastic body is a coil spring.

5. 3. The on-vehicle electrical device according to claim 1, wherein the elastic body is a leaf spring.

6. The in-vehicle electrical device according to claim 1 or 2, An automotive electrical equipment, wherein the substrate support portion is the bottom of the case, a floor portion of the case located above the bottom, or a ceiling portion of the case, and the opposing portion is the bottom, floor or ceiling portion of the case that faces the substrate support portion in the vertical direction.

7. The in-vehicle electrical device according to claim 1 or 2, The vehicle is an electric vehicle including an electric motor that outputs driving force to wheels, and a battery that supplies power to the electric motor, The board is an in-vehicle electrical device constituting a device that is used to charge the battery with power from an external power source.

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