Power distribution device

Abstract

A power distribution device (200) comprises: a resin part (830) covering a part of each of a power line and a signal line, and having a switch arranged on the bottom surface (830a); and a support body (800) arranged on the side of a loading surface (830b) on the back side of the bottom surface, and having a cooling function. The power line and the signal line each have a passing part (841) extending in a plane direction orthogonal to the z direction in which the bottom surface and the loading surface are arranged, and a lead-out part (842) extending from the passing part toward the bottom surface, inside the resin part. In the z direction, the support body, the passing part of the power line, and the passing part of the signal line are arranged separately.

Description

[0001] Citation of related applications

[0002] This application is based on patent application No. 2020-073051 filed in Japan on April 15, 2020, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The disclosure described in this specification relates to a power distribution device. Background Art

[0004] As shown in Patent Document 1, there is known a relay unit including a base member, a control bus bar, a bus bar, a relay, and a fan.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-206601 Summary of the invention

[0008] In Patent Document 1, a control busbar is wired on the back side of the base member, while a relay, a busbar, and a fan are placed on the front side of the base member. Therefore, the size of the relay unit in a direction perpendicular to the surface of the base member may increase.

[0009] An object of the present disclosure is to provide a power distribution device capable of suppressing an increase in size.

[0010] A power distribution device according to one embodiment of the present disclosure includes:

[0011] a switch that controls the connection and disconnection of the power supplied between the power source and the electric load;

[0012] A control unit, wherein the control unit controls the switch to open or close using a control signal whose voltage is lower than the supplied power;

[0013] Power lines, through which power flows;

[0014] A signal line, wherein the signal line is used for control signals to flow through;

[0015] a resin portion that covers a portion of each of the power line and the signal line and has a switch provided on one side; and

[0016] a cooling unit, the cooling unit being provided on the back side of one surface of the resin unit,

[0017] The power line and the signal line each have a passing portion extending in a planar direction perpendicular to the arrangement direction in which the one surface and the back surface are arranged inside the resin portion, and a lead portion extending from the passing portion toward the one surface side.

[0018] The passage portion of the power line and the passage portion of the signal line are located in a projection area of ​​the cooling portion projected in the arrangement direction, and are arranged separately in the arrangement direction.

[0019] According to the present disclosure, it is possible to suppress an increase in the size of the power distribution device in the planar direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit diagram for explaining the power supply system.

[0021] Figure 2 It is a cross-sectional view for explaining the power distribution device according to the first embodiment.

[0022] Figure 3 It is a partial cross-sectional view for explaining the resin portion.

[0023] Figure 4 It is a partial cross-sectional view for explaining the connection state of each of the power line and the signal line.

[0024] Figure 5 It is a partial cross-sectional view of a resin portion for explaining the power distribution device according to the second embodiment.

[0025] Figure 6 It is a partial cross-sectional view of a resin portion for explaining the power distribution device according to the third embodiment. DETAILED DESCRIPTION

[0026] Hereinafter, with reference to the accompanying drawings, a plurality of methods for implementing the present disclosure will be described. In each method, sometimes the same reference numerals are given to the parts corresponding to the matters described in the previous method, and repeated descriptions are omitted. In the case where only a part of the structure is described in each method, other methods previously described can be applied to other parts of the structure.

[0027] Parts that are specifically indicated as being combinable in each embodiment can be combined with each other. In addition, as long as there is no hindrance in the combination, even if it is not explicitly indicated as being combinable, the embodiments, the embodiments and the modified examples, and the modified examples can be partially combined with each other.

[0028] (First Embodiment)

[0029] based on Figure 1 to Figure 4, a power distribution device of this embodiment is described. The power distribution device is applicable to electric vehicles such as electric vehicles and plug-in hybrid vehicles. In this embodiment, a structure in which the power distribution device is applicable to an electric vehicle is described as an example.

[0030] <Power supply system>

[0031] like Figure 1 As shown, the power distribution device 200 is included in the power supply system 10 of the vehicle. The power supply system 10 includes a battery pack 100, a front PCU 300, a front MG 400, a rear PCU 500, and a rear MG 600 in addition to the power distribution device 200. An external power supply 700 is connected to the power supply system 10.

[0032] In addition, PCU is an abbreviation of a power control unit. MG is an abbreviation of a motor generator. Moreover, in the drawings, the front PCU 300 is represented as FrPCU. The front MG 400 is represented as FrMG. The rear PCU 500 is represented as RrPCU. The rear MG 600 is represented as RrMG. The external power supply 700 is represented as EPS.

[0033] The battery pack 100 and the external power supply 700 correspond to power supplies. The front PCU 300, the front MG 400, the rear PCU 500, and the rear MG 600 correspond to electrical loads.

[0034] As a power supply path, in the vehicle, the battery pack 100 and the power distribution device 200 are electrically connected via a wire harness or the like. The front PCU 300 and the rear PCU 500 are electrically connected to the power distribution device 200 via a wire harness or the like. The front MG 400 is electrically connected to the front PCU 300, and the rear MG 600 is electrically connected to the rear PCU 500. Due to this electrical connection structure, the DC power output from the battery pack 100 is supplied to the front PCU 300 and the rear PCU 500 via the power distribution device 200.

[0035] The front PCU 300 and the rear PCU 500 each include an inverter or a converter for performing power conversion. The front PCU 300 and the rear PCU 500 convert the supplied DC power into AC power. Conversely, the front PCU 300 and the rear PCU 500 convert the supplied AC power into DC power.

[0036] The front MG 400 and the rear MG 600 are motor generators for driving the vehicle, respectively, for applying propulsion force to the vehicle. The front MG 400 and the rear MG 600 are powered by AC power supplied from the front PCU 300 and the rear PCU 500. The front wheels of the vehicle rotate by the power operation of the front MG 400. The rear wheels of the vehicle rotate by the power operation of the rear MG 600.

[0037] The front MG 400 and the rear MG 600 generate regenerative power by the propulsion force of the vehicle. The AC power generated by the regenerative power generation is converted into DC power by the front PCU 300 and the rear PCU 500. The DC power is supplied to the battery pack 100 via the power distribution device 200.

[0038] The external power source 700 is externally connected to the power distribution device 200. The DC charging power output from the external power source 700 is supplied to the battery pack 100. Thus, the battery pack 100 is charged.

[0039] As shown above, the power distribution device 200 supplies the DC power (power supply power) supplied from the battery pack 100 to the PCU. The power distribution device 200 supplies the power (regenerative power) generated by the regenerative power generation of the MG and converted into DC power by the PCU to the battery pack 100. The power distribution device 200 supplies the charging power supplied from the external power supply 700 to the battery pack 100. In addition, the power distribution device 200 also supplies this power to various electrical loads not shown. The power supply power, the regenerative power, and the charging power are equivalent to the supply power. Below, the components of the power distribution device 200 are described separately.

[0040] <Power distribution device>

[0041] As power supply lines, the power distribution device 200 has first to sixth power lines 201 to 206. As electrical components provided in these power lines, the power distribution device 200 has a main switch 210, a power switch 220, a precharge circuit 230, a discharge circuit 240, a pyroswitch 250, and a current sensor 260. In addition, the power distribution device 200 has a control unit 270 that controls the current of these switches to be turned on and off.

[0042] In the drawings, the current sensor 260 is represented by CS. The control unit 270 is represented by CU. The main switch 210, the power switch 220, and the explosion fuse 250 are equivalent to switches. The control unit 270 is equivalent to a control unit.

[0043] A first connection terminal 200a is provided at one end of the first power line 201. A second connection terminal 200b is provided at one end of the second power line 202. The battery pack 100 is connected to the first connection terminal 200a and the second connection terminal 200b. Specifically, the negative electrode of the battery pack 100 is connected to the first connection terminal 200a. The positive electrode of the battery pack 100 is connected to the second connection terminal 200b.

[0044] A main switch 210 is provided on the first power line 201 and the second power line 202, respectively. In addition, a third connection terminal 200c is provided at the other end of the first power line 201. A fourth connection terminal 200d is provided at the other end of the second power line 202. The front PCU 300 is connected to the third connection terminal 200c and the fourth connection terminal 200d. In addition, an explosion fuse 250 is provided on the first power line 201, but the explosion fuse 250 is in an energized state when the power distribution device 200 is normal.

[0045] Due to this electrical connection structure, when the main switch 210 is turned on, the battery pack 100 is electrically connected to the front PCU 300. In addition, an electrical load (not shown) is electrically connected to the third connection terminal 200c and the fourth connection terminal 200d. The electrical load includes an ACDC converter, a DCDC converter, and vehicle accessories.

[0046] One end of the third power line 203 is connected to the midpoint between the third connection terminal 200c and the main switch 210 in the first power line 201. One end of the fourth power line 204 is connected to the midpoint between the fourth connection terminal 200d and the main switch 210 in the second power line 202.

[0047] Furthermore, a fifth connection terminal 200e is provided at the other end of the third power line 203. A sixth connection terminal 200f is provided at the other end of the fourth power line 204. The rear PCU 500 is connected to the fifth connection terminal 200e and the sixth connection terminal 200f.

[0048] Due to this electrical connection structure, when main switch 210 is turned on, battery pack 100 and rear PCU 500 are electrically connected.

[0049] One end of the fifth power line 205 is connected to the midpoint between the first connection terminal 200a and the main switch 210 in the first power line 201. One end of the sixth power line 206 is connected to the midpoint between the second connection terminal 200b and the main switch 210 in the second power line 202.

[0050] Power switches 220 are provided on the fifth power line 205 and the sixth power line 206. A seventh connection terminal 200g is provided at the other end of the fifth power line 205. An eighth connection terminal 200h is provided at the other end of the sixth power line 206. The external power source 700 is connected to the seventh connection terminal 200g and the eighth connection terminal 200h.

[0051] Due to this electrical connection structure, when the power switch 220 is turned on, the external power source 700 is electrically connected to the battery pack 100. Furthermore, when the main switch 210 is turned on, the external power source 700 is electrically connected to the PCU.

[0052] In addition, the main switch 210 and the power switch 220 are respectively mechanical switch elements. The main switch 210 is a normally closed switch element that is turned off by the input of the drive signal output from the control unit 270, and is turned on when the input of the drive signal is interrupted. The power switch 220 is a normally open switch element that is turned on by the input of the drive signal output from the control unit 270, and is turned off when the input of the drive signal is interrupted.

[0053] The precharge circuit 230 includes a charging switch 231 and a charging resistor 232 connected in series. The precharge circuit 230 is connected in parallel to the main switch 210 provided on the second power line 202 .

[0054] Front PCU 300 and rear PCU 500 electrically connected to second power line 202 each include a large-capacity smoothing capacitor. One of two electrodes included in the smoothing capacitor is electrically connected to first power line 201 , and the other is electrically connected to second power line 202 .

[0055] The smoothing capacitor is used in a charged state. When charging the smoothing capacitor, the main switch 210 of the second power line 202 is turned off, and the charging switch 231 and the main switch 210 of the first power line 201 are turned on. In this way, power is supplied from the battery pack 100 to the smoothing capacitor via the charging resistor 232. By allowing the charge to flow through the charging resistor 232, a sharp increase in the amount of current flowing from the battery pack 100 to the smoothing capacitor can be suppressed.

[0056] The discharge circuit 240 includes a discharge switch 241 and a discharge resistor 242 connected in series. The discharge circuit 240 connects the first power line 201 and the second power line 202. One end of the discharge circuit 240 is connected to a midpoint between a connection point of the third power line 203 in the first power line 201 and the main switch 210. The other end of the discharge circuit 240 is connected to a midpoint between a connection point of the fourth power line 204 in the second power line 202 and the main switch 210.

[0057] As described above, the smoothing capacitor is charged when in use, but the charge accumulated in the smoothing capacitor becomes unnecessary when not in use. In order to discharge the charge, the main switch 210 and the charging switch 231 are turned off and the discharge switch 241 is turned on. In this way, a closed loop including the discharge resistor 242 and the smoothing capacitor is formed. The discharge resistor 242 and the smoothing capacitor are connected in series. As a result, the charge accumulated in the smoothing capacitor flows out through the discharge resistor 242. By making the charge flow out through the discharge resistor 242 in this way, the charge accumulated in the smoothing capacitor is gradually released.

[0058] The explosion fuse 250 is provided between the connection point of the fifth power line 205 in the first power line 201 and the first connection terminal 200a. The explosion fuse 250 is a normally closed switch. When an abnormality occurs in the power distribution device 200, the explosion fuse 250 becomes cut off.

[0059] The explosion fuse 250 is specifically an explosive material, and explodes when an abnormality occurs, thereby cutting off the power supply to the first power line 201. Due to this property, the explosion fuse 250 is a disposable electrical component.

[0060] The current sensor 260 is disposed between the explosion fuse 250 and the first connection terminal 200a in the first power line 201. The current sensor 260 realizes the function of detecting the current flowing through the first power line 201.

[0061] The power distribution device 200 includes first to fifth signal lines 271 to 275 as output lines of control signals of the control unit 270 and a sixth signal line 276 as an output line of sensor information.

[0062] like Figure 1 As shown, one end of each of the first signal line 271 to the sixth signal line 276 is connected to the control unit 270. The other end of the first signal line 271 is connected to the main switch 210. The other end of the second signal line 272 is connected to the power switch 220. The other end of the third signal line 273 is connected to the charging switch 231. The other end of the fourth signal line 274 is connected to the discharging switch 241. The other end of the fifth signal line 275 is connected to the explosion fuse 250. In addition, the other end of the sixth signal line 276 is connected to the current sensor 260.

[0063] Due to the connection structure shown above, the control unit 270 is electrically connected to the main switch 210, the power switch 220, the charging switch 231, the discharging switch 241, the explosion fuse 250 and the current sensor 260. In addition, the control unit 270 communicates with the vehicle-mounted ECU via wiring (not shown).

[0064] The control unit 270 controls the opening and closing of various switches included in the power distribution device 200 based on the vehicle signal including the vehicle information inputted from the vehicle sensor (not shown) or the like through the communication with the vehicle ECU, and the current value inputted from the current sensor 260. That is, the control unit 270 controls the energization and disconnection of various switches.

[0065] <Switch control>

[0066] When an abnormality occurs in the power distribution device 200, the control unit 270 puts the explosion fuse 250 in a cut-off state. That is, the control unit 270 causes the explosion fuse 250 to explode. As a result, the power supply through the power distribution device 200 is cut off. In addition, in the various other switch controls shown below, the explosion fuse 250 is in an energized state. Therefore, the description of the control of the explosion fuse 250 is omitted below.

[0067] When the smoothing capacitor is charged, the control unit 270 turns on the charging switch 231 and the main switch 210 of the first power line 201. The control unit 270 turns off the main switch 210, the power switch 220, and the discharge switch 241 of the second power line 202. As a result, the power of the battery pack 100 is supplied to the smoothing capacitor via the charging resistor 232. In addition, in other switch controls shown below, the charging switch 231 is turned off. Therefore, the description of the control of the charging switch 231 is omitted below.

[0068] When the smoothing capacitor is discharged, the control unit 270 turns the discharge switch 241 to the energized state. The control unit 270 turns the main switch 210 and the power switch 220 to the off state. As a result, the charge accumulated in the smoothing capacitor flows out through the discharge resistor 242. In addition, in other switch controls shown below, the discharge switch 241 is turned off. Therefore, the description of the control of the discharge switch 241 is omitted below.

[0069] In normal situations such as when the vehicle is parked or driving normally, the control unit 270 turns on the main switch 210 and turns off the power switch 220. As a result, the power of the battery pack 100 is supplied to the front PCU 300 and the rear PCU 500. Conversely, the regenerative power of the front MG 400 and the rear MG 600 is supplied to the battery pack 100. In addition, these powers are supplied to the electrical loads on the vehicle.

[0070] In the parking state, when charging is performed with the external power source 700 connected to the power distribution device 200, the control unit 270 turns on the power switch 220. Thus, the charging power of the external power source 700 is supplied to the battery pack 100. In addition, when the control unit 270 turns on the main switch 210, the charging power is supplied to the front PCU 300, the rear PCU 500, and the electrical loads.

[0071] <Structure of power distribution device>

[0072] Next, based on Figure 2 to Figure 4 , the structure of the power distribution device 200 will be described. In addition, the structure of the power distribution device 200 is schematically shown in each figure.

[0073] Hereinafter, three directions orthogonal to each other are referred to as the x direction, the y direction, and the z direction. In the drawings, the description of "direction" is omitted and only x, y, and z are recorded. The z direction is equivalent to the arrangement direction. The direction orthogonal to the z direction is equivalent to the plane direction.

[0074] The power distribution device 200 includes Figure 1 In addition to the various components shown, it also has Figure 2 The support body 800, the cover body 810, the heat transfer sheet 820 and the resin part 830 are shown. The cover body 810 and the support body 800 are connected to form a storage space. Figure 1 The various components of the power distribution device 200 shown are stored together in the storage space. Figure 1 The first to eighth connection terminals 200a to 200h are shown. In addition, a structure in which at least one of the eight connection terminals is stored in the storage space may be adopted.

[0075] The support body 800 has a base 801 and a bottom plate 802. The base 801 is made of, for example, aluminum die casting. The bottom plate 802 is made of, for example, aluminum.

[0076] The base 801 has an inner wall surface 801a and an outer wall surface 801b arranged separately in the z direction, and a side wall surface 801c connecting the two wall surfaces. A groove portion 801d selectively recessed from the inner wall surface 801a toward the outer wall surface 801b is formed in the base 801. Due to the groove portion 801d, the thickness of the base 801 in the z direction becomes uneven.

[0077] The bottom plate portion 802 is formed into a flat shape with a relatively thin thickness in the z direction. The bottom plate portion 802 has an upper surface 802a and a lower surface 802b which are arranged separately in the z direction. The bottom plate portion 802 is arranged on the inner wall surface 801a side of the base 801 in a manner that covers the space divided by the groove portion 801d. The bottom plate portion 802 is arranged relative to the base 801 in a manner that the lower surface 802b of the bottom plate portion 802 is in contact with the inner wall surface 801a in the z direction. As a result, a part of the lower surface 802b and the wall surface that divides the groove portion 801d are separated in the z direction and arranged relative to each other. In this relative arrangement state, the bottom plate portion 802 is mechanically connected to the base 801 by welding or the like.

[0078] By welding the bottom plate 802 and the base 801, a flow path 804 for the cooling fluid to flow therebetween is formed. The flow path 804 is formed by the lower surface 802b which is separated and opposed in the z direction and the wall surface which divides the groove 801d. Figure 2 As shown, the portion of the lower surface 802b constituting the flow path 804 may also be flat, or may be formed with a plurality of protrusions to increase the contact area with the cooling fluid. The flow outlet of the flow path 804 opens on any one of the side wall surface 801c, the inner wall surface 801a, and the outer wall surface 801b. The flow path 804 is equivalent to the cooling portion.

[0079] The heat transfer sheet 820 is provided on the upper surface 802a of the bottom plate 802. The heat transfer sheet 820 is formed of an insulating resin material. The heat transfer sheet 820 is deformed according to the shape of the surface concavo-convex formed on the upper surface 802a, so as to be in close contact with the upper surface 802a. Through this close contact, the thermal resistance between the heat transfer sheet 820 and the bottom plate 802 is reduced.

[0080] The resin portion 830 covers a portion of the plurality of power lines and a portion of the plurality of signal lines described so far and connects them integrally. A portion of each of the plurality of power lines and the plurality of signal lines is insert-molded in the resin portion 830. In addition, the resin portion 830 is composed of a plurality of components, and a structure in which a portion of each of the plurality of power lines and the plurality of signal lines is provided between the plurality of components may be adopted.

[0081] The resin part 830 has a bottom surface 830a and a mounting surface 830b which are arranged separately in the z direction. The mounting surface 830b side of the resin part 830 is provided on the heat transfer sheet 820. The heat transfer sheet 820 is deformed according to the shape of the surface concave and convex of the mounting surface 830b. As a result, the heat transfer sheet 820 and the mounting surface 830b are in close contact. By this close contact, the thermal resistance between the resin part 830 and the heat transfer sheet 820 is reduced. The bottom surface 830a is equivalent to one side. The mounting surface 830b is equivalent to the back side.

[0082] In this way, the heat transfer sheet 820 is sandwiched between the resin portion 830 and the bottom plate portion 802. The resin portion 830 and the bottom plate portion 802 are respectively in close contact with the heat transfer sheet 820. Therefore, the heat of the resin portion 830 is easily transferred to the bottom plate portion 802 via the heat transfer sheet 820. The heat transfer sheet 820 can promote heat transfer from the resin portion 830 to the bottom plate portion 802.

[0083] like Figure 2 As shown, in the upper space between the bottom surface 830a side of the resin portion 830 in the storage space and the cover 810, a Figure 1 In other words, the upper space is provided with a main switch 210, a charging switch 231, a discharge circuit 240, an explosion fuse 250, a current sensor 260, and a control unit 270. Although not shown, the power switch 220 and the charging resistor 232 are also provided in the upper space.

[0084] As described above, current flows through various electrical components housed in the upper space. Therefore, Joule heat is generated in various electrical components. This Joule heat is transferred to the resin portion 830 through heat radiation, heat transfer, heat conduction, etc. In addition, Joule heat is also generated in the power line or signal line covered by the resin portion 830. As a result, the resin portion 830 is heated.

[0085] However, as described above, the heat of the resin portion 830 is easily transferred to the bottom plate portion 802 via the heat transfer sheet 820. This heat is transferred to the cooling liquid flowing in the flow path 804. Furthermore, the heat transferred to the cooling liquid is transferred to the external environment via the base 801. By this heat transfer (heat dissipation), the temperature rise of the resin portion 830 can be suppressed. At the same time, by transferring heat to the resin portion 830 whose temperature rise is suppressed, the temperature rise of various electrical components stored in the upper space can also be suppressed.

[0086] <Power lines and signal lines>

[0087] As described above, a plurality of power lines and a portion of a plurality of signal lines are covered in the resin portion 830. In the following description, in order to distinguish the components, a portion of the power lines covered by the resin portion 830 is represented as a covered power line 831, and a portion not covered is represented as an exposed power line 832. A portion of the signal line covered by the resin portion 830 is represented as a covered signal line 833, and a portion not covered is represented as an exposed signal line 834.

[0088] The covered power line 831, the exposed power line 832, and the covered signal line 833 are metal busbars formed by punching a metal plate, respectively. The exposed signal line 834 is an insulated wire.

[0089] exist Figure 1, the covered power line 831 and the covered signal line 833 are indicated by dotted lines, and the exposed power line 832 and the exposed signal line 834 are indicated by solid lines. Thus, as distinguished and indicated by dotted lines and solid lines, the first power line 201, the fifth power line 205, and the sixth power line 206 each include the covered power line 831. The first power line 201, the third power line 203, and the fourth power line 204 include the exposed power line 832.

[0090] As described above, a main switch 210, an explosion fuse 250, and a current sensor 260 are provided on the first power line 201. In order to cross-link them and electrically connect them between the first connection terminal 200a and the third connection terminal 200c, the first power line 201 is divided into four. One of them is composed of the covered power line 831, and the remaining three are composed of the exposed power lines 832.

[0091] A main switch 210 is provided on the second power line 202. In order to electrically connect it to the second connection terminal 200b and the fourth connection terminal 200d, the second power line 202 is divided into two. The two parts are each composed of an exposed power line 832.

[0092] The third power line 203 branches off from the exposed power line 832 of the first power line 201 and extends. The fourth power line 204 branches off from the exposed power line 832 of the second power line 202 and extends.

[0093] A charging switch 231 is provided on the fifth power line 205. In order to electrically connect it to the first power line 201 and the seventh connection terminal 200g, the fifth power line 205 is divided into two. The two are respectively formed by the covering power line 831.

[0094] A charging switch 231 is provided on the sixth power line 206. In order to electrically connect it to the second power line 202 and the eighth connection terminal 200h, the sixth power line 206 is divided into two. Each of them is composed of a covering power line 831.

[0095] The first to fourth signal lines 271 to 274 each include a covered signal line 833 and an exposed signal line 834. The fifth signal line 275 and the sixth signal line 276 include an exposed signal line 834. The exposed signal lines 834 of these signal lines are connected to the control unit 270, respectively.

[0096] exist Figure 1 , one first signal line 271 is shown, but in reality, two first signal lines 271 are connected to two main switches 210 , respectively. The overlay signal line 833 of the two first signal lines 271 is connected to the main switch 210 .

[0097] Similarly, in Figure 1, one second signal line 272 is shown, but in reality, two second signal lines 272 are connected to two charging switches 231 , respectively. The overlay signal line 833 of the two second signal lines 272 is connected to the charging switch 231 .

[0098] The covered signal line 833 of the third signal line 273 is connected to the charging switch 231, and the covered signal line 833 of the fourth signal line 274 is connected to the discharging switch 241. The exposed signal line 834 of the fifth signal line 275 is connected to the exploding fuse 250, and the exposed signal line 834 of the sixth signal line 276 is connected to the current sensor 260.

[0099] <Covering power lines and covering signal lines>

[0100] like Figure 3 As schematically shown, the covered power line 831 and the covered signal line 833 each include a running portion 841 covered by the resin portion 830 , a lead portion 842 , and a connection portion 843 exposed from the resin portion 830 .

[0101] The passing portion 841 extends in the x-direction and the y-direction in the resin portion 830. The lead portion 842 extends in the z-direction from the end of the passing portion 841 toward the bottom surface 830a. The connection portion 843 extends from the end of the lead portion 842 and is located above the bottom surface 830a.

[0102] The connection portion 843 covering the power line 831 is formed with a bolt hole 843a for fixing the electrical component or the exposed power line 832 with a bolt or for realizing a function as a connection terminal. The bolt hole 843a opens in the z direction. Figure 4 , a structure in which the exposed power line 832 is fixed to the connection portion 843 by means of bolts 844 is shown.

[0103] In addition, a recessed portion 830c partially recessed from the bottom surface 830a toward the mounting surface 830b is formed in the resin portion 830. The front end side of the shaft portion of the bolt 844 protruding from the bolt hole 843a is provided in the recessed portion 830c. In addition, a thread groove may be formed on the wall surface that divides the recessed portion 830c.

[0104] The connection portion 843 covering the signal line 833 protrudes in the z direction. Figure 4 As shown, a connector with a signal line 834 exposed is connected to the protrusion. Thus, the two are electrically connected.

[0105] In addition, if Figure 2As schematically shown, the positions of the multiple electrical components connected to the power lines and signal lines are different in the x-direction and y-direction. According to the positions of the connection objects of these power lines and signal lines in the x-direction and y-direction, the respective running portions 841 covering the power lines 831 and the covering signal lines 833 extend in the x-direction and y-direction inside the resin portion 830.

[0106] The length of the passage portion 841 in the extension direction is longer than the lengths of the lead portion 842 and the connection portion 843. Therefore, the Joule heat generated in the passage portion 841 is greater than the Joule heat generated in the lead portion 842 and the connection portion 843.

[0107] like Figure 2 to Figure 4 As clearly shown, the position of the passage portion 841 generating large Joule heat in the z direction is different between the passage portion 841 covering the power line 831 and the passage portion 841 covering the signal line 833. The passage portion 841 covering the power line 831, the passage portion 841 covering the signal line 833, and various electrical components are arranged in the z direction. At least a part of the passage portion 841 covering the power line 831, the passage portion 841 covering the signal line 833, and various electrical components are located in the projection area of ​​the flow path 804 projected in the z direction.

[0108] The length of the passage portion 841 in the extension direction is longer for covering the electric force lines 831 than for covering the signal lines 833. The lateral width of the passage portion 841 perpendicular to the extension direction and the z-direction is longer for covering the electric force lines 831 than for covering the signal lines 833. The area of ​​the passage portion 841 overlapping with the projection area of ​​the flow path 804 in the z-direction is larger for covering the electric force lines 831 than for covering the signal lines 833.

[0109] The passage portion 841 covering the electric power line 831 is located on the mounting surface 830b side in the z direction. The passage portion 841 covering the signal line 833 is located on the bottom surface 830a side in the z direction.

[0110] In other words, the passage portion 841 covering the power line 831 is located closer to the flow path 804 where the cooling fluid flows in the z direction than the passage portion 841 covering the signal line 833. The passage portion 841 covering the power line 831 is located farther from the electrical component that generates Joule heat in the z direction than the passage portion 841 covering the signal line 833.

[0111] <Effects>

[0112] The passage portion 841 covering the power line 831 and the passage portion 841 covering the signal line 833 are arranged in the z direction. This can suppress the increase in the size of the power distribution device 200 in the planar direction perpendicular to the z direction.

[0113] As based on Figure 1As described above, power supply power, regenerative power, and charging power flow through the power line. The voltage is about 200V to 400V. On the other hand, control signals flow through the signal line. The voltage is about 0V, 5V, or 12V.

[0114] Thus, the applied voltage of the power line is much higher than the applied voltage of the signal line. In terms of volts, the applied voltage of the power line is more than 10 times higher than the applied voltage of the signal line. The resin portion 830 is covered with a covered power line 831 and a covered signal line 833 of the signal line, which have extremely different applied voltages. The covered power line 831 is more likely to become high temperature than the covered signal line 833.

[0115] In this regard, the passing portion 841 covering the power line 831 is located closer to the mounting surface 830b of the resin portion 830 than the passing portion 841 covering the signal line 833. That is, the passing portion 841 covering the power line 831 is located closer to the flow path 804 than the passing portion 841 covering the signal line 833. Therefore, the heat generated in the power line can be efficiently dissipated to the cooling fluid flowing in the flow path 804. As a result, the temperature rise of the resin portion 830 can be suppressed. By transferring heat to the resin portion 830 whose temperature rise is suppressed, the temperature rise of various electrical components stored in the upper space can also be suppressed.

[0116] The area overlapping the projection area of ​​the flow path 804 in the z direction is larger than the area covering the passage 841 of the electric power line 831 than the area covering the passage 841 of the signal line 833. Thus, the heat of the passage 841 covering the electric power line 831 can be efficiently dissipated to the cooling fluid flowing in the flow path 804.

[0117] A bolt hole 843a opened in the z direction is formed in the connection portion 843 covering the power line 831. The shaft of the bolt 844 can be inserted into the bolt hole 843a from the bottom surface 830a toward the mounting surface 830b side in the z direction.

[0118] The connection portion 843 covering the signal line 833 protrudes in the z direction. The protrusion allows the connector that exposes the signal line 834 to be connected from the bottom surface 830a toward the mounting surface 830b in the z direction.

[0119] As described above, the assembly work of other components to the connection portions 843 of the power lines and signal lines is unified in the direction from the bottom surface 830a toward the mounting surface 830b in the z direction. Therefore, the assembly work can be simplified.

[0120] (Second Embodiment)

[0121] Next, based on Figure 5 A second embodiment will be described.

[0122] In the first embodiment, the entire passage portion 841 covering the electric power line 831 is covered by the resin portion 830 . In contrast, in the present embodiment, a portion of the passage portion 841 covering the electric power line 831 is exposed from the resin portion 830 .

[0123] The passing portion 841 covering the electric power line 831 is exposed from the mounting surface 830b of the resin portion 830. Therefore, the exposed portion of the passing portion 841 is in direct contact with the heat transfer sheet 820. Thus, heat is easily transferred from the passing portion 841 to the heat transfer sheet 820.

[0124] In addition, the power distribution device 200 described in this embodiment includes the same components as the power distribution device 200 described in the first embodiment. Therefore, the power distribution device 200 of this embodiment naturally has the same effects as the power distribution device 200 described in the first embodiment. Therefore, the description thereof is omitted. The description of the repeated effects is also omitted in other embodiments shown below.

[0125] (Third Embodiment)

[0126] Next, based on Figure 6 A third embodiment will be described.

[0127] In the first embodiment, an example is shown in which the power lines and the signal lines are covered by the resin portion 830. In contrast, in the present embodiment, the shield portion 850 is covered by the resin portion 830 together with the power lines and the signal lines.

[0128] The shielding part 850 is made of a material having a higher magnetic permeability than the resin part 830. As a forming material of the shielding part 850, for example, a metal material such as copper can be used. Figure 6 As shown, the shield 850 is embedded between the passage 841 covering the power line 831 and the passage 841 covering the signal line 833 in the resin part 830. The shield 850 is formed into a flat shape with a thin thickness in the z direction. The shield 850 extends in the extension direction of the passage 841 covering the signal line 833.

[0129] Due to this structure, it is possible to suppress the electromagnetic noise output from the covered power line 831 from penetrating the covered signal line 833 .

[0130] (Other Modifications)

[0131] In the present embodiment, an example is shown in which both the front MG 400 and the rear MG 600 are provided on the vehicle. However, a structure in which only one of the front MG 400 and the rear MG 600 is provided on the vehicle may be adopted. In the case in which only one of the two MGs is provided on the vehicle, only one of the front MG 400 and the rear MG 600 is provided on the vehicle.

[0132] Although the present disclosure is described based on the embodiments, it should be understood that the present disclosure is not limited to the above embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, further including only a single element, other combinations and methods above or below on this basis also belong to the scope and scope of thought of the present disclosure.

Claims

1. A power distribution device, comprising: a switch that controls the switching on and off of the supplied power between the power source and the electric load; a control unit configured to control the switch to open or close by using a control signal having a voltage lower than the supplied power; a power line through which the supply power flows; a signal line through which the control signal flows; a resin portion that covers a portion of each of the power line and the signal line and has the switch provided on one surface side; and a cooling unit provided on a back side of the one surface of the resin unit, The power line and the signal line each have a passing portion and a lead-out portion extending from the passing portion toward the one surface side inside the resin portion, wherein the passing portion extends in a planar direction orthogonal to an arrangement direction in which the one surface and the back surface are arranged. The passage portion of the power line and the passage portion of the signal line are located in a projection area of ​​the cooling unit projected in the arrangement direction, and are arranged separately in the arrangement direction.

2. The power distribution device according to claim 1, characterized in that: The passage portion of the power line is located closer to the rear surface side than the passage portion of the signal line in the arrangement direction.

3. The power distribution device according to claim 1, characterized in that: Regarding the area overlapping with the projection region in the arrangement direction, the area of ​​the passage portion of the electric force line is larger than the area of ​​the passage portion of the signal line.

4. The power distribution device according to claim 1, characterized in that: The power distribution device includes an insulating heat transfer sheet provided between the resin portion and the cooling portion to promote heat conduction between the resin portion and the cooling portion.

5. The power distribution device according to claim 4, characterized in that: A portion of the passage portion of the electric power line is exposed from the back surface and contacts the heat transfer sheet.

6. The power distribution device according to any one of claims 1 to 5, characterized in that: The cooling unit has a flow path for flowing a cooling fluid.

7. The power distribution device according to any one of claims 1 to 5, characterized in that: The power distribution device includes a shield portion that is interposed between the passage portion of the power line and the passage portion of the signal line in the arrangement direction and has a magnetic permeability higher than that of the resin portion.

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