JP2022012536A - Electric product - Google Patents

Abstract

To provide an electric product in which an electric component is easily cooled.SOLUTION: An electric product includes: a flow channel 560 comprising an electric component 542, a first flow channel 570 extended in one direction, and in which a supply port 573 to which a coolant for cooling the electric component is supplied is formed at one end, a third flow channel 590 extended in one direction and in which an exhaust port 593 from which the coolant is exhausted so as to be paralleled in an arrangement direction orthogonal to one direction is formed at one end, and a second flow channel 580 connecting the other end of the first flow channel and the other end of the third flow channel; and a wall part 550 positioned between the first flow channel and the third flow channel. All of the second flow channel on the side separated from the supply port and the exhaust port from the wall part is paralleled to the electric component in a direction orthogonal to one direction and an arrangement direction, and a length orthogonal to a second distribution channel directed from the supply port to the exhaust port in the second flow channel is larger than a length orthogonal to a first distribution channel directed to the exhaust port from the supply port in the first flow channel and a length orthogonal to a third distribution channel directed to the exhaust port from the supply port in the third flow channel.SELECTED DRAWING: Figure 2

Description

The disclosures described herein relate to electrical appliances.

Patent Document 1 describes a power conversion device having a DCDC converter, a housing, and a flow path cover. The DCDC converter is housed in a housing. The flow path cover is fixed to the lower surface of the bottom wall of the housing. The flow path cover is formed with a recess that serves as a refrigerant flow path through which the refrigerant flows. A refrigerant introduction port into which the refrigerant is introduced and a refrigerant discharge port in which the refrigerant is discharged are formed in the refrigerant flow path.

Japanese Unexamined Patent Publication No. 2019-198200

The refrigerant flow path extends away from the refrigerant introduction port, then turns back and extends toward the discharge port. The DCDC converter is aligned with a part of the refrigerant flow path on the side separated from the refrigerant introduction port and the refrigerant discharge port. Therefore, cooling of the DCDC converter may be suppressed.

Therefore, an object of the present disclosure is to provide an electric product in which electric parts are easily cooled.

The electrical products according to one aspect of the present disclosure are
Electrical components (542) and
A first flow path (570) extending in one direction and having a supply port (573) for supplying a refrigerant for cooling an electric component at one end, and an arrangement direction extending in one direction and orthogonal to one direction at one end. A second flow that connects the third flow path (590) in which the discharge port (593) for discharging the refrigerant is formed along with the supply port, and the other end of the first flow path and the other end of the third flow path. A flow path (560) comprising a road (580), and a flow path (560).
It has a wall portion (550) located between the first flow path and the third flow path, and has.
All of the second flow paths located on the side away from the supply port and the discharge port from the wall part are lined up with the electric parts in the orthogonal directions orthogonal to each of the one-way and the line-up directions.
The length orthogonal to the second distribution path from the supply port to the discharge port in the second flow path is orthogonal to the first distribution path from the supply port to the discharge port in the first flow path, and the length in the third flow path. The lengths orthogonal to the third distribution channel from the supply port to the discharge port are longer than each.

According to this, the decrease of the projected area in the orthogonal direction to the electric component (542) of the second flow path (580) is suppressed. This makes it easier for the electrical component (542) to be cooled by the refrigerant.

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope at all.

It is a circuit diagram explaining an in-vehicle system. It is a top view explaining an electric product. FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. It is sectional drawing explaining the modification. It is a top view explaining a modification.

Hereinafter, a plurality of embodiments for carrying out the present disclosure will be described with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding forms, and duplicate explanations may be omitted. When only a part of the configuration is described in each form, other forms described above can be applied to the other parts of the configuration.

Further, not only the combination of the parts that clearly indicate that the combination is possible in each embodiment, but also the combination of the embodiments and the embodiment even if the combination is not specified if there is no problem in the combination. It is also possible to partially combine the modified examples and the modified examples.

(First Embodiment)
An in-vehicle system 100 provided with an electric product 700 will be described with reference to FIG. The in-vehicle system 100 constitutes a system for an electric vehicle. The in-vehicle system 100 includes a battery 200, a motor 400, an electric product 700, and a plurality of ECUs (not shown). The electric appliance 700 has a power converter 300 and a DCDC converter 600.

These plurality of ECUs send and receive signals to and from each other via bus wiring. A plurality of ECUs cooperate to control an electric vehicle. By controlling the plurality of ECUs, the regeneration and power running of the motor 400 according to the SOC of the battery 200 are controlled. SOC is an abbreviation for state of charge. ECU is an abbreviation for electronic control unit.

The battery 200 has a plurality of secondary batteries. These plurality of secondary batteries form a battery stack connected in series. The SOC of this battery stack corresponds to the SOC of the battery 200. As the secondary battery, a lithium ion secondary battery, a nickel hydrogen secondary battery, an organic radical battery and the like can be adopted.

The power conversion device 300 performs power conversion between the battery 200 and the motor 400. The power conversion device 300 converts the DC power of the battery 200 into AC power having a voltage level suitable for the power running of the motor 400. The power conversion device 300 converts the AC power generated by the power generation (regeneration) of the motor 400 into DC power having a voltage level suitable for charging the battery 200.

Further, the power conversion device 300 converts the DC power of the battery 200 into low-voltage DC power. This low-voltage DC power is charged into an auxiliary battery (not shown). Low-voltage DC power is supplied from the auxiliary battery to auxiliary equipment such as the vehicle's power steering device, floodlight, and various electronic control units.

The motor 400 is connected to an output shaft of an electric vehicle (not shown). The rotational energy of the motor 400 is transmitted to the traveling wheels of the electric vehicle via the output shaft. On the contrary, the rotational energy of the traveling wheel is transmitted to the motor 400 via the output shaft.

The motor 400 is powered by AC power supplied from the power converter 300. As a result, propulsive force is imparted to the traveling wheels. Further, the motor 400 is regenerated by the rotational energy transmitted from the traveling wheels. The AC power generated by this regeneration is converted into DC power by the power conversion device 300 and is stepped down. This DC power is supplied to the battery 200. DC power is also supplied to various electric loads mounted on electric vehicles.

<Power converter>
The power converter 300 includes a converter 310 and an inverter 320. Power is supplied to the converter 310 from the battery 200 via the first power supply bus bar 301 and the second power supply bus bar 302. Power is supplied to the inverter 320 from the converter 310 via the second power supply bus bar 302 and the third power supply bus bar 303.

As shown in FIG. 1, the converter 310 has a first capacitor 330, a reactor 340, and an A-phase leg 313 consisting of a first high-side switch 311 and a first low-side switch 312. The first high-side diode 311a is connected in anti-parallel to the first high-side switch 311. The first low-side diode 312a is connected in anti-parallel to the first low-side switch 312.

The first capacitor 330 is connected to the first feeding bus bar 301 and the second feeding bus bar 302. The A-phase leg 313 is connected to the third feeding bus bar 303 and the second feeding bus bar 302. The first high-side switch 311 and the first low-side switch 312 are connected in series between the third power supply bus bar 303 and the second power supply bus bar 302. The reactor 340 is connected between the first high-side switch 311 and the second high-side switch 321 and between the first capacitor 330 via a connecting bus bar 304.

The first high-side switch 311 and the first low-side switch 312 are open / closed controlled by the above-mentioned ECU. As a result, the ECU steps up and down the voltage level of the DC power input to the converter 310.

The inverter 320 has a second capacitor 350 and a U-phase leg 323 to a W-phase leg 325. The U-phase leg 323 to the W-phase leg 325 have a second high-side switch 321 and a second low-side switch 322, respectively. The second high-side diode 321a is connected in antiparallel to the second high-side switch 321 of the U-phase leg 323 to the W-phase leg 325. The second low-side diode 322a is connected in anti-parallel to the second low-side switch 322 of the U-phase leg 323 to the W-phase leg 325.

The second capacitor 350 is connected to the third feeding bus bar 303 and the second feeding bus bar 302. The U-phase leg 323 to the W-phase leg 325 are connected to the third feeding bus bar 303 and the second feeding bus bar 302, respectively. The second high-side switch 321 and the second low-side switch 322 are connected in series between the third power supply bus bar 303 and the second power supply bus bar 302.

A U-phase bus bar 361 is connected between the second high-side switch 321 and the second low-side switch 322 included in the U-phase leg 323. The U-phase bus bar 361 is connected to the U-phase stator coil of the motor 400.

A V-phase bus bar 362 is connected between the second high-side switch 321 and the second low-side switch 322 included in the V-phase leg 324. The V-phase bus bar 362 is connected to the V-phase stator coil of the motor 400.

A W-phase bus bar 363 is connected between the second high-side switch 321 and the second low-side switch 322 included in the W-phase leg 325. The W-phase bus bar 363 is connected to the W-phase stator coil of the motor 400.

Further, ECU control signals are input to the gate electrodes of the second high-side switch 321 and the second low-side switch 322 included in the U-phase legs 323 to the W-phase leg 325. As a result, the ECU converts the DC power input to the converter 310 into AC power having a voltage level suitable for the power running of the motor 400.

In this way, the converter 310 and the inverter 320 each perform power conversion. Therefore, the converter 310 and the inverter 320 tend to generate heat.

The A-phase leg 313, the U-phase leg 323, the V-phase leg 324, and the W-phase leg 325 are each resin-sealed with a coating resin. As a result, a plurality of switch modules (not shown) are configured. These switch modules are stacked to form a power module (not shown).

<DCDC converter>
The DCDC converter 600 is connected in parallel with the battery 200 via the first power supply bus bar 301 and the second power supply bus bar 302. Further, the DCDC converter 600 is connected to an auxiliary battery (not shown).

The DCDC converter 600 has a plurality of electric components such as a transformer, a switch element, a choke coil, and a capacitor (not shown). The DCDC converter 600 steps down the voltage of the battery 200 by these plurality of electric components.

The DC power of the step-down battery 200 is supplied to the auxiliary battery. The auxiliary battery is charged with stepped-down low-voltage DC power. Then, low-voltage DC power is supplied from this auxiliary battery to an auxiliary device (not shown).

In this way, the DCDC converter 600 has a function of stepping down the DC power. Therefore, the DCDC converter 600 tends to generate heat. The calorific value of the DCDC converter 600 is larger than the calorific value of the reactor 340 included in the converter 310.

<Components of electrical products>
Next, the configuration of the electric product 700 will be described. In the following, the three directions orthogonal to each other will be referred to as the x direction, the y direction, and the z direction. The arrangement direction corresponds to the x direction. One direction corresponds to the y direction. The orthogonal direction corresponds to the z direction. In addition, the description of "direction" is omitted in the drawings. In the drawings, the DCDC converter 600 is abbreviated as D.

The electric appliance 700 has a case 500, a cover 530, a reactor case 541, a DCDC converter case 542, and a capacitor case 543, in addition to the circuit components described so far. The DCDC converter case 542 corresponds to an electric component.

The reactor 340 is housed in the reactor case 541. The DCDC converter 600 is housed in the DCDC converter case 542. The first capacitor 330 and the second capacitor 350 are housed in the capacitor case 543.

<Case>
The case 500 has a bottom 510 and a side 520. The bottom 510 has a flat shape with a thin thickness in the z direction. The bottom portion 510 has an inner bottom surface 510a and an outer bottom surface 510b on the back side thereof.

The side portion 520 is connected to the inner bottom surface 510a of the bottom portion 510. The side portion 520 stands up in an annular shape from the inner bottom surface 510a. The side portion 520 has a first side portion 521 and a third side portion 523 that are separated from each other in the x direction and face each other, and a second side portion 522 and a fourth side portion 524 that are separated from each other in the y direction and face each other. ..

The first side portion 521, the second side portion 522, the third side portion 523, and the fourth side portion 524 are connected in an annular direction in the circumferential direction around the z direction.

Due to the form shown above, the storage space is partitioned inside the case 500 by the bottom 510 and the side 520. A reactor case 541, a DCDC converter case 542, a capacitor case 543, and a power module (not shown) are housed in this storage space.

Further, the bottom portion 510 is formed with a recess 511 that is recessed from the outer bottom surface 510b toward the inner bottom surface 510a. The recess 511 has a first side surface 511a located on the side portion 520 side in the plane direction along the x direction and the y direction, a second side surface 511b facing the first side surface 511a in the plane direction, and a first side surface 511a and a second side surface. It is partitioned by a connecting surface 511c connecting 511b. The projection surface of the recess 511 on the bottom 510 in the z direction has a substantially U-shape.

<Cover>
As shown in FIG. 3, the cover 530 has a flat shape having a thin thickness in the z direction. The cover 530 has a first main surface 530a and a second main surface 530b on the back side thereof.

The cover 530 is provided on the outer bottom surface 510b in such a manner that the first main surface 530a faces the connecting surface 511c. The flow path 560 through which the refrigerant flows is partitioned by the first main surface 530a, the first side surface 511a, the connecting surface 511c, and the second side surface 511b.

<Flow path>
The flow path 560 has a first flow path 570, a second flow path 580, and a third flow path 590. A supply port 573 to which the refrigerant is supplied is formed in the first flow path 570. A discharge port 593 through which the refrigerant is discharged is formed in the third flow path 590. A second flow path 580 connecting them is provided between the first flow path 570 and the third flow path 590.

The refrigerant is supplied from the supply port 573 to the first flow path 570. The refrigerant passes through the first flow path 570 and then flows into the second flow path 580. The refrigerant passes through the second flow path 580 and then flows into the third flow path 590. Then, the refrigerant that has passed through the third flow path 590 is discharged from the discharge port 593.

<Morphology of flow path>
As shown in FIG. 2, the first flow path 570 and the third flow path 590 are arranged so as to be separated from each other in the x direction. The first flow path 570 extends along the y direction on the first side portion 521 side. The supply port 573 is formed at one end of the first flow path 570 on the fourth side portion 524 side. The third flow path 590 extends along the y direction on the third side portion 523 side. The discharge port 593 is formed at one end of the third flow path 590 on the fourth side portion 524 side.

The second flow path 580 is connected between the other end of the first flow path 570 on the side separated from the supply port 573 and the other end of the third flow path 590 on the side separated from the discharge port 593. The second flow path 580 extends from the supply port 573 toward the discharge port 593. The projection surface of the second flow path 580 on the bottom 510 in the z direction has a fan-like shape. In the drawing, the boundary between the first flow path 570, the second flow path 580, and the third flow path 590 is shown by a broken line.

<Flow path and wall>
The first flow path 570 has a first supply flow path 571 located on the supply port 573 side and a second supply flow path 57 2 connected to an end of the first supply flow path 571 on the side separated from the supply port 573. There is.

The third flow path 590 has a first discharge flow path 591 located on the discharge port 593 side and a second discharge flow path 592 connected to an end on the side of the first discharge flow path 591 separated from the discharge port 593. There is.

A wall portion 550 is provided between the first flow path 570 and the third flow path 590. The wall portion 550 extends toward the cover 530 in a manner away from the connecting surface 511c.

The wall portion 550 is a first wall portion 551 located between the first supply flow path 571 and the first discharge flow path 591, and a second wall located between the second supply flow path 57 2 and the second discharge flow path 592. It has a portion 552.

The second flow path 580 is located on the second side portion 522 side of the end of the second wall portion 552 on the side separated from the first wall portion 551. The second flow path 580 is connected between the other end of the second supply flow path 527 on the side separated from the supply port 573 and the other end of the second discharge flow path 592 on the side separated from the discharge port 593. ..

In the drawing, the boundary between the first supply flow path 571 and the second supply flow path 572 is shown by a broken line. The boundary between the first discharge flow path 591 and the second discharge flow path 592 is indicated by a alternate long and short dash line. In the drawing, the boundary between the first wall portion 551 and the second wall portion 552 is shown by a alternate long and short dash line.

<Projection surface of the wall>
As shown in FIG. 2, the projection plane of the first wall portion 551 on the bottom portion 510 in the z direction forms a rectangle. The wall surfaces of the first wall portion 551 arranged in the plane direction form a part of the second side surface 511b. The wall surfaces of the first wall portion 551 arranged in the plane direction are provided on the first wall portion 551 so as to follow the outer periphery of the rectangle.

As shown in FIG. 2, the projection surface of the second wall portion 552 on the bottom portion 510 in the z direction has a substantially elliptical shape. The wall surfaces of the second wall portion 552 arranged in the plane direction form a part of the second side surface 511b. The wall surfaces of the second wall portion 552 arranged in the plane direction are provided on the second wall portion 552 so as to follow the outer periphery of a substantially elliptical shape.

Further, the projection plane of the second wall portion 552 on the bottom portion 510 in the z direction has the shortest passing length in the x direction. The projection plane of the second wall portion 552 on the bottom portion 510 in the z direction has the longest passing length in the y direction. Hereinafter, the shortest delivery length is appropriately referred to as a minor diameter. The length of the longest delivery is indicated as the major axis.

<Flow path width>
The flow path 560 has a width in the width direction orthogonal to the distribution path from the supply port 573 to the discharge port 593. The distribution channels include a first distribution path from the supply port 573 of the first flow path 570 to the discharge port 593, a second distribution path from the supply port 573 of the second flow path 580 to the discharge port 593, and a third flow path. It has a third distribution channel from the supply port 573 of the 590 to the discharge port 593.

The first supply flow path width L11 orthogonal to the first distribution path of the first supply flow path 571 is the same as the first discharge flow path width L31 orthogonal to the third distribution path of the first discharge flow path 591. ..

The width L12 of the second supply flow path orthogonal to the first distribution path of the second supply flow path 572 gradually increases from the end of the second wall portion 552 on the first wall portion 551 side toward the minor diameter of the second wall portion 552. It is shortened to.

The second supply flow path width L12 of the second supply flow path 572 is the shortest at a position aligned with the minor axis of the second wall portion 552 in the x direction. The second supply flow path width L12 of the second supply flow path 572 is shorter than the first supply flow path width L11 and the first discharge flow path width L31 at a position aligned with the minor axis of the second wall portion 552 in the x direction. ing.

The second supply flow path width L12 gradually increases from the short diameter of the second wall portion 552 toward the end of the second wall portion 552 away from the first wall portion 551. The second supply flow path width L12 of the second supply flow path 571 located at the end of the second wall portion 552 on the side separated from the first wall portion 551 is the first supply flow path width L11 and the first discharge flow path width. It is longer than L31.

Similarly, the width L32 of the second discharge channel orthogonal to the third distribution path of the second discharge channel 592 is directed from the end of the second wall portion 552 on the first wall portion 551 side to the minor diameter of the second wall portion 552. Is getting shorter and shorter.

The second discharge flow path width L32 of the second discharge flow path 592 is the shortest at a position aligned with the minor axis of the second wall portion 552 in the x direction. The second discharge flow path width L32 of the second discharge flow path 592 is shorter than the first supply flow path width L11 and the first discharge flow path width L31 at a position aligned with the minor axis of the second wall portion 552 in the x direction. ing.

The width L32 of the second discharge flow path gradually increases from the short diameter of the second wall portion 552 toward the end of the second wall portion 552 away from the first wall portion 551. The second discharge flow path width L32 of the second discharge flow path 592 located at the end of the second wall portion 552 on the side separated from the first wall portion 551 is the first supply flow path width L11 and the first discharge flow path width. It is longer than L31.

Further, the second flow path width L2 orthogonal to the second distribution path of the second flow path 580 is the longest at a position aligned with the major axis of the second wall portion 552 in the y direction. The length of the second flow path width L2 aligned with the major axis of the second wall portion 552 in the second flow path 580 in the y direction is longer than the first supply flow path width L11 and the first discharge flow path width L31. ..

Although not shown, the length of the second flow path width L2 aligned with the major axis of the second wall portion 552 in the second flow path 580 in the y direction is the first supply flow path width L11 and the first discharge flow path width L31. It may be the same as. Further, the length of the second flow path width L2 may be longer than the second supply flow path width L12 and the second discharge flow path width L32.

<Disturbance of refrigerant>
The refrigerant collides with the first side surface 511a of the second flow path 580 in the process of flowing from the second supply flow path 527 toward the second discharge flow path 592. The refrigerant flows into the second discharge flow path 592 while being in close contact with the first side surface 511a of the second flow path 580.

Further, the refrigerant collides with the second side surface 511b in the process of flowing through the second supply flow path 572 and the second discharge flow path 592. The refrigerant flows into the first discharge flow path 591 while being in close contact with the second side surface 511b of each of the second supply flow path 572 and the second discharge flow path 592.

<Case storage form>
As described above, the reactor case 541, the DCDC converter case 542, the capacitor case 543, and the power module (not shown) are housed in the storage space of the case 500. The reactor case 541 is provided on the inner bottom surface 510a on the fourth side portion 524 side. The DCDC converter case 542 is provided on the inner bottom surface 510a on the second side portion 522 side. The capacitor case 543 is provided on the inner bottom surface 510a on the first side portion 521 side.

<State facing the flow path>
The DCDC converter case 542 is lined up in the z direction with a part of the second supply flow path 572, all of the second flow path 580, a part of the second discharge flow path 592, and a part of the second wall portion 552. There is.

The second supply flow path width L12 on the first supply flow path 571 side projected onto the DCDC converter case 542 in the z direction is shorter than the first supply flow path width L11 and the first discharge flow path width L31. ..

The second supply flow path width L12 located at the end of the second wall portion 552 on the side separated from the first wall portion 551, which is projected onto the DCDC converter case 542 in the z direction, is the first supply flow path width L11 and the first. It is longer than 1 discharge flow path width L31.

The second discharge flow path width L32 on the first discharge flow path 591 side projected onto the DCDC converter case 542 in the z direction is shorter than the first supply flow path width L11 and the first discharge flow path width L31. ..

The second discharge flow path width L32 located at the end of the second wall portion 552 on the side separated from the first wall portion 551, which is projected onto the DCDC converter case 542 in the z direction, is the first supply flow path width L11 and the first. It is longer than 1 discharge flow path width L31.

The second flow path width L2 of the second flow path 580 projected onto the DCDC converter case 542 in the z direction and aligned with the major axis of the second wall portion 552 in the y direction is the first supply flow path width L11 and the first discharge flow path. It is longer than the width L31.

The area of the second flow path 580 projected on the DCDC converter case 542 in the z direction is larger than the area of the second wall portion 552 projected on the DCDC converter case 542 in the z direction.

The area of the overlapping region of the second wall portion 552 with the DCDC converter case 542 in the z direction is smaller than the area of the non-overlapping region of the second wall portion 552 with the DCDC converter case 542 in the z direction. There is.

The area of the overlapping region of the second wall portion 552 with the DCDC converter case 542 in the z direction corresponds to the projected area of the second wall portion 552 projected onto the DCDC converter case 542 in the z direction.

The projected area of the second wall portion 552 projected on the DCDC converter case 542 in the z direction is the projected area of the second supply flow path 527 and the second discharge flow path 592 projected on the DCDC converter case 542 in the z direction. It is smaller than the total area with the projected area.

The projected area of the second supply flow path 527 projected onto the DCDC converter case 542 in the z direction corresponds to the area of the overlapping region of the second supply flow path 542 with the DCDC converter case 542 in the z direction.

The projected area of the second discharge flow path 592 projected onto the DCDC converter case 542 in the z direction corresponds to the area of the overlapping region of the second discharge flow path 592 with the DCDC converter case 542 in the z direction.

The reactor case 541 is a part of the first supply flow path 571, a part of the second supply flow path 572, a part of the first discharge flow path 591, and a part of the second discharge flow path 592 on the fourth side portion 524 side. , A part of the first wall portion 551 and a part of the second wall portion 552, respectively, are arranged in the z direction.

<Action effect>
As described above, the DCDC converter case 542 is aligned with all of the second flow paths 580 in the z direction. The second flow path width L2 of the second flow path 580 projected onto the DCDC converter case 542 in the z direction and aligned with the major axis of the second wall portion 552 in the y direction is the first supply flow path width L11 and the first discharge flow path. It is longer than the width L31. Therefore, the amount of the refrigerant flowing in the second flow path 580 tends to increase. This makes it easier for the DCDC converter 600 to be cooled.

As described above, the area of the second flow path 580 projected on the DCDC converter case 542 in the z direction becomes larger than the area of the second wall portion 552 projected on the DCDC converter case 542 in the z direction. There is. The amount of the refrigerant flowing in the second flow path 580 tends to increase. The DCDC converter 600 is easily cooled.

As described above, the area of the area of the second wall portion 552 overlapping with the DCDC converter case 542 in the z direction is the area of the non-overlapping region of the second wall portion 552 with the DCDC converter case 542 in the z direction. It is smaller than the area. Therefore, the amount of the refrigerant flowing in the second flow path 580 tends to increase. The refrigerant flowing in the second flow path 580 and the DCDC converter 600 are easily exchanged for heat.

As described above, the projected area of the second wall portion 552 projected onto the DCDC converter case 542 in the z direction is smaller than the total area described above. Therefore, the amount of the refrigerant that cools the DCDC converter 600 tends to increase. This facilitates heat exchange between the refrigerant and the DCDC converter 600.

As described above, the second supply flow path width L12 on the first supply flow path 571 side projected onto the DCDC converter case 542 in the z direction is the first supply flow path width L11 and the first discharge flow path width. It is shorter than L31. Therefore, the flow velocity of the refrigerant flowing in the second supply flow path 572 tends to increase. The cooling efficiency between the DCDC converter 600 and the refrigerant is likely to be improved.

As described above, the refrigerant flows into the second discharge flow path 592 while being in close contact with the first side surface 511a of the second flow path 580. Therefore, the DCDC converter 600 is easily cooled positively in the second flow path 580.

As described above, the refrigerant flows into the first discharge flow path 591 while being in close contact with the second side surface 511b of each of the second supply flow path 572 and the second discharge flow path 592. Therefore, the DCDC converter 600 tends to be positively cooled in each of the second supply flow path 572 and the second discharge flow path 592.

(First modification)
In this embodiment, the wall portion 550 is integrally connected to the connecting surface 511c. However, the wall portion 550 does not have to be integrally connected to the connecting surface 511c. As shown in FIG. 4, the wall portion 550 may be connected to the first main surface 530a of the cover 530. The wall portion 550 may extend toward the connecting surface 511c. There may be a gap between the tip of the wall portion 550 and the connecting surface 511c. In that case, the refrigerant flows through this void. The DCDC converter 600 is easily cooled by the refrigerant flowing in the voids.

(Second modification)
In the present embodiment, the projection plane of the second wall portion 552 on the bottom portion 510 in the z direction has a substantially elliptical shape. However, as shown in FIG. 5, the projection surface of the second wall portion 552 on the bottom portion 510 in the z direction may have a rectangular shape.

(Other variants)
In this embodiment, an example is shown in which the power conversion device 300 is included in the in-vehicle system 100 for an electric vehicle. However, the application of the power conversion device 300 is not particularly limited to the above example. For example, a configuration in which a power conversion device 300 is included in a hybrid system including a motor 400 and an internal combustion engine can be adopted.

In this embodiment, an example in which one motor 400 is connected to the power conversion device 300 is shown. However, it is also possible to adopt a configuration in which a plurality of motors 400 are connected to the power conversion device 300. In this case, the power conversion device 300 has a plurality of three-phase switch modules for forming the inverter 320.

542 ... DCDC converter case, 550 ... wall part, 551 ... first wall part, 552 ... second wall part, 560 ... flow path, 570 ... first flow path, 573 ... supply port, 580 ... second flow path, 590 … Third flow path, 593… Discharge port

Claims (5)

Electrical components (542) and
A first flow path (570) extending in one direction and having a supply port (573) for supplying a refrigerant for cooling the electric component at one end, and extending in one direction and orthogonal to the one end. A third flow path (590) having a discharge port (593) for discharging the refrigerant, which is aligned with the supply port in the alignment direction, and the other end of the first flow path and the other end of the third flow path. A second flow path (580) connecting the above, and a flow path (560) including the second flow path (580).
It has a wall portion (550) located between the first flow path and the third flow path.
All of the second flow paths located on the side separated from the supply port and the discharge port from the wall portion are lined up with the electric components in orthogonal directions orthogonal to each of the one direction and the alignment direction.
The length orthogonal to the second distribution path from the supply port to the discharge port in the second flow path is the length orthogonal to the first distribution path from the supply port to the discharge port in the first flow path. , An electric product having a length orthogonal to a third distribution path from the supply port to the discharge port in the third flow path, respectively. The electric component is orthogonal to all of the second flow paths, the other ends of the first flow path and the third flow path, and the sides of the wall portion separated from the supply port and the discharge port. Lined up in the direction,
The electric product according to claim 1, wherein the projected area of the wall portion on the electric component along the orthogonal direction is smaller than the projected area of the second flow path on the electric component along the orthogonal direction. .. The wall portion is connected to the first wall portion (551) located on the supply port and the discharge port side, and on the side of the first wall portion separated from the supply port and the discharge port, and is connected to the electric component. The electric appliance according to claim 1 or 2, wherein the second wall portion (552) in which the portions are arranged in the orthogonal direction is provided. Claim that the area of the overlapping region in the orthogonal direction with the electric component in the second wall portion is smaller than the area of the non-overlapping region in the orthogonal direction with the electric component in the second wall portion. The electrical product according to item 3. The area of the overlapping region in the orthogonal direction with the electric component in the second wall portion is the area of the overlapping region in the orthogonal direction with the electric component in the first flow path, and the area of the overlapping region in the third flow path. The electrical product according to claim 3 or 4, wherein the total area is smaller than the total area including the area of the overlapping region in the orthogonal direction with the electrical component.

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