Electric apparatus

Abstract

To provide an electric apparatus in which temperature rise of a device is suppressed.SOLUTION: An electric apparatus comprises: a power supply bus bar; capacitors 100A, 100B; a metal housing 120; and heat dissipation members 131, 132. The power supply bus bar connects a power supply with electric components. The capacitors are connected to the power supply bus bar and to the ground. The metal housing comprises a bottom to which the capacitors are fixed and which is connected to the ground. The heat dissipation members have insulation properties and thermal conductivity higher than that of air. The capacitors comprise devices 31, 32, 33, 41, 42, 43 and capacitor bus bars 30, 40. The capacitor bus bars comprise first bus bars 50, 60; second bus bars 70, 80; and fixed bus bars 55, 65. The first bus bars connect the devices to the power supply bus bar. The second bus bars connect the devices to the ground. The fixed bus bars are fixed to the bottom. The heat dissipation members are provided between the fixed bus bars and the bottom.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The disclosure herein relates to electrical devices. [Background technology]

[0002] The resin molded capacitor of Patent Document 1 has a case, a capacitor element housed in the case, a bus bar attached to the capacitor element, a resin member that encases the capacitor element and the bus bar, and a heat dissipation member that extends from the inside of the resin member to the outside of the resin member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-191805 A Summary of the Invention [Problem to be solved by the invention]

[0004] According to the configuration of Patent Document 1, the heat transferred to the capacitor element and the bus bar can be transferred to the outside via the resin member and the heat dissipation member. However, the heat cannot be efficiently dissipated to the heat dissipation member due to the resin member. There is a risk that the temperature of the capacitor element will rise due to the heat being trapped in the resin member.

[0005] An object of the present disclosure is to provide an electric device in which temperature rise of elements is suppressed. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an electrical device comprising: a power bus bar (140, 150) connected to the power source (2) and the electrical components (11, 20); A capacitor (100A, 100B) connected to the power bus bar and to ground (90A, 90B); a metal housing (120) having a bottom (110) to which the capacitor is fixed and which is connected to ground; A heat dissipation member (131, 132) having insulating properties and a higher thermal conductivity than air, The capacitor is Elements (31, 32, 33, 41, 42, 43), The capacitor bus bars (30, 40) include a first bus bar (50, 60) connecting the element and the power bus bar, a second bus bar (70, 80) connecting the element and the ground, and a fixed bus bar (55, 65) extending from the first bus bar or the second bus bar toward the bottom and fixed to the bottom, A heat dissipation member is provided between the fixed bus bar and the bottom.

[0007] With this, heat generated by energizing the power bus bars (140, 150) is transferred to the bottom (110) via the fixed bus bars (55, 65) and the heat dissipation members (131, 132). As a result, heat transfer to the elements (31, 32, 33, 41, 42, 43) is suppressed, and the temperature rise of the elements can be suppressed.

[0008] It should be noted that the reference numbers in parentheses above merely indicate the corresponding relationship with the configurations described in the embodiments described below, and do not in any way limit the technical scope. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an electric circuit diagram of the electric device. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a plan view of the electrical device as seen from the rear side. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 4 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8]FIG. 11 is a plan view of the electrical device according to the second embodiment, as viewed from the rear side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, the same reference numerals may be used to designate parts corresponding to matters described in the preceding embodiment, and duplicated descriptions may be omitted. In each embodiment, when only a part of the configuration is described, the other embodiment described previously may be applied to the other parts of the configuration.

[0011] In addition to combinations of parts that are explicitly stated as possible in each embodiment, it is also possible to partially combine embodiments, embodiments and variations, and variations even if not explicitly stated, provided that there are no particular problems with the combination.

[0012] (First embodiment) <In-vehicle systems> FIG. 1 is an electric circuit diagram of an electric device 10 mounted on an in-vehicle system 1. The electric device 10 is sometimes referred to as a power conversion device. The in-vehicle system 1 is equipped with a high-voltage battery 2, a motor generator 4, and the electric device 10. The vehicle on which the in-vehicle system 1 is mounted is a hybrid automobile that can run by switching between and / or combining the driving force of an engine and the driving force of the motor generator 4. The engine and the motor generator 4 are interconnected via a gear device 5. The gear device 5 has a role of transmitting power.

[0013] The electric device 10 has a positive high voltage wiring 10A, a negative high voltage wiring 10B, an inverter 11, a connecting bus bar 14, a control circuit board 15, a smoothing capacitor 20, a Y capacitor 100, and a housing 120. The positive high voltage wiring 10A is a wiring connected to the positive electrode of the high voltage battery 2. The negative high voltage wiring 10B is a wiring connected to the negative electrode of the high voltage battery 2. The positive high voltage wiring 10A is made of conductive members such as a positive power supply bus bar 140. The negative high voltage wiring 10B is made of conductive members such as a negative power supply bus bar 150. The positive power supply bus bar 140 and the negative power supply bus bar 150 may be collectively referred to as power supply bus bars 140, 150.

[0014] The inverter 11 is connected to a positive high voltage wiring 10A and a negative high voltage wiring 10B. The inverter 11 has a plurality of semiconductor modules 12. Each semiconductor module 12 has two switching elements 13 and two diodes 13A. The two switching elements 13 are connected in series between the positive high voltage wiring 10A and the negative high voltage wiring 10B.

[0015] A positive input terminal 11A is connected to the collector electrode of one of the two switching elements 13 that is provided on the high potential side. A negative input terminal 11B is connected to the emitter of one of the two switching elements 13 that is provided on the low potential side. The anode of diode 13A is connected to the emitter of the corresponding switching element 13. The cathode of diode 13A is connected to the collector of the corresponding switching element 13.

[0016] A motor terminal 11C connected to the motor generator 4 is connected to the emitter of the switching element 13 on the high potential side and the collector of the switching element 13 on the low potential side. The multiple switching elements 13 convert DC power supplied from the high voltage battery 2 into AC power capable of driving the motor generator 4. The converted power is supplied to the motor generator 4 via a connecting bus bar 14.

[0017] The control circuit board 15 controls the on / off of the multiple switching elements 13. A control circuit that controls the on / off of the multiple switching elements 13 is mounted on the control circuit board 15. Connection terminals 11D of the multiple switching elements 13 are solder-connected to the control circuit board 15. Connection terminals 11D of the multiple switching elements 13 are electrically connected to the control circuit board 15.

[0018] The smoothing capacitor 20 mainly smoothes the DC voltage supplied from the high-voltage battery 2. The smoothing capacitor 20 is connected to a positive-side high-voltage wiring 10A and a negative-side high-voltage wiring 10B. The smoothing capacitor 20 is connected in parallel to the inverter 11 and the Y capacitor 100. The high-voltage wirings 10A and 10B electrically connect the inverter 11, the smoothing capacitor 20, the Y capacitor 100, and the high-voltage battery 2.

[0019] The Y capacitor 100 mainly removes noise components leaking from the inverter 11. The Y capacitor 100 of this embodiment includes six elements 31, 32, 33, 41, 42, 43, two Y capacitor bus bars 30, 40, two cases 160, 170, two fastening members 91, 92, and two heat dissipation members 131, 132. The number of elements is not limited to six. The number of elements may be at least two or more. The Y capacitor 100 includes a positive Y capacitor 100A and a negative Y capacitor 100B. The positive Y capacitor 100A and the negative Y capacitor 100B will be described later.

[0020] Of the six elements 31, 32, 33, 41, 42, 43, three may be referred to as positive side elements 31, 32, 33. The positive side elements 31, 32, 33 have a positive side first element 31, a positive side second element 32, and a positive side third element 33. The remaining three may be referred to as negative side elements 41, 42, 43. The negative side elements 41, 42, 43 have a negative side first element 41, a negative side second element 42, and a negative side third element 43.

[0021] One of the two Y capacitor busbars 30, 40 may be referred to as the positive side Y capacitor busbar 30. The remaining one may be referred to as the negative side Y capacitor busbar 40. One of the two cases 160, 170 may be referred to as the positive side case 160. The remaining one may be referred to as the negative side case 170. The positive side Y capacitor busbar 30 may be referred to as the positive side capacitor busbar. The negative side Y capacitor busbar 40 may be referred to as the negative side capacitor busbar.

[0022] The three positive elements 31, 32, 33, the positive Y capacitor bus bar 30, the positive case 160, the fastening member 91, and the heat dissipation member 131 may be collectively referred to as the positive Y capacitor 100A. The three negative elements 41, 42, 43, the negative Y capacitor bus bar 40, the negative case 170, the fastening member 92, and the heat dissipation member 132 may be collectively referred to as the negative Y capacitor 100B.

[0023] The positive electrode side elements 31, 32, 33 are housed in the positive electrode side case 160. The positive electrode side Y capacitor bus bar 30 connects the positive electrode of the high voltage battery 2 and the first ground 90A via the positive electrode side elements 31, 32, 33. The positive electrode side elements 31, 32, 33 have positive electrode side leads 31A, 32A, 33A connected to the positive electrode of the high voltage battery 2, and positive electrode side G leads 31B, 32B, 33B connected to the first ground 90A. The positive electrode side leads 31A, 32A, 33A have a positive electrode side first lead 31A, a positive electrode side second lead 32A, and a positive electrode side third lead 33A. The positive electrode side G leads 31B, 32B, 33B have a positive electrode side first G lead 31B, a positive electrode side second G lead 32B, and a positive electrode side third G lead 33B.

[0024] The positive electrode Y capacitor bus bar 30 has a positive electrode first bus bar 50, a positive electrode second bus bar 70, and a positive electrode fixed bus bar 55. The positive electrode first bus bar 50 electrically connects the positive electrode of the high voltage battery 2 to the positive electrode leads 31A, 32A, and 33A. The positive electrode second bus bar 70 electrically connects the positive electrode G leads 31B, 32B, and 33B to the first ground 90A. One end of the positive electrode fixed bus bar 55 is integrally connected to the positive electrode first bus bar 50. The other end of the positive electrode fixed bus bar 55 is fixed to the back surface 110B of the bottom 110 described later via a heat dissipation member 131. The positive electrode first bus bar 50 and the positive electrode leads 31A, 32A, and 33A are connected via solder 34. The positive electrode second bus bar 70 and the positive electrode G leads 31B, 32B, and 33B are connected via solder 35.

[0025] Additionally, the positive electrode second bus bar 70 has a fastened portion 75 on which a fastening member 91 is provided. The fastened portion 75 is fixed to the bottom 110 via the fastening member 91, and is thereby electrically connected to the first ground 90A. The positive electrode side elements 31, 32, 33 transmit noise components leaking from the inverter 11 to the first ground 90A via the positive electrode second bus bar 70 and the fastening member 91.

[0026] Similarly, the negative electrode side elements 41, 42, 43 are housed in the negative electrode side case 170. The negative electrode side Y capacitor bus bar 40 connects the negative electrode of the high voltage battery 2 and the second ground 90B via the negative electrode side elements 41, 42, 43. The negative electrode side elements 41, 42, 43 have negative electrode side leads 41A, 42A, 43A connected to the negative electrode of the high voltage battery 2, and negative electrode side G leads 41B, 42B, 43B connected to the second ground 90B. The negative electrode side leads 41A, 42A, 43A have a negative electrode side first lead 41A, a negative electrode side second lead 42A, and a negative electrode side third lead 43A. The negative electrode side G leads 41B, 42B, 43B have a negative electrode side first G lead 41B, a negative electrode side second G lead 42B, and a negative electrode side third G lead 43B.

[0027] The negative electrode Y capacitor bus bar 40 has a negative electrode first bus bar 60, a negative electrode second bus bar 80, and a negative electrode fixed bus bar 65. The negative electrode first bus bar 60 electrically connects the negative electrode of the high voltage battery 2 to the negative electrode leads 41A, 42A, and 43A. The negative electrode second bus bar 80 electrically connects the negative electrode G leads 41B, 42B, and 43B to the second ground 90B. One end of the negative electrode fixed bus bar 65 is integrally connected to the negative electrode first bus bar 60. The other end of the negative electrode fixed bus bar 65 is fixed to the back surface 110B of the bottom 110 via a heat dissipation member 132. The negative electrode first bus bar 60 and the negative electrode leads 41A, 42A, and 43A are connected via solder 44. The negative electrode second bus bar 80 and the negative electrode G leads 41B, 42B, 43B are connected via solder 45.

[0028] The first positive lead 31A, the second positive lead 32A, the third positive lead 33A, the first negative lead 41A, the second negative lead 42A, the third negative lead 43A may be collectively referred to as one end leads. The first positive lead 31B, the second positive lead 32B, the third positive lead 33B, the first negative lead 41B, the second negative lead 42B, the third negative lead 43B may be collectively referred to as the other end leads.

[0029] Furthermore, the negative electrode second bus bar 80 has a fastened portion 85 on which a fastening member 92 is provided. The fastened portion 85 is fixed to the bottom 110 via the fastening member 92, and is thereby electrically connected to the second ground 90B. The negative electrode side elements 41, 42, 43 transmit noise components leaking from the inverter 11 to the second ground 90B via the negative electrode second bus bar 80 and the fastening member 92.

[0030] The heat dissipation members 131, 132 are a heat dissipation sheet, a gap filler, a heat dissipation grease, or the like. The heat dissipation members 131, 132 have a higher thermal conductivity than air. The heat dissipation members 131, 132 are insulating. As will be described in detail later, the heat dissipation members 131, 132 are provided between the Y capacitor bus bars 30, 40 and the bottom 110. The heat is efficiently transferred from the Y capacitor bus bars 30, 40 to the bottom 110.

[0031] <Mechanical configuration of electrical equipment> Before describing the mechanical configuration of the electric device 10, the drawings will be described. Fig. 1 is an electric circuit diagram of the electric device 10. Fig. 2 is a side view of the electric device 10. Fig. 3 is a plan view of the electric device 10 as viewed from the rear surface 110B. Fig. 4 is a cross-sectional view of the positive Y capacitor 100A. Fig. 5 is a cross-sectional view of the positive fixed bus bar 55. Fig. 6 is a cross-sectional view of the negative Y capacitor 100B. Fig. 7 is a cross-sectional view of the negative fixed bus bar 65.

[0032] Hereinafter, the thickness direction of the bottom 110 may be referred to as the Z direction, and the direction perpendicular to the Z direction may be referred to as the perpendicular direction. One direction perpendicular to the Z direction, specifically, the arrangement direction of the positive Y capacitor 100A and the negative Y capacitor 100B, is referred to as the X direction. The X direction corresponds to one direction. Also, the direction perpendicular to both the Z direction and the X direction is referred to as the Y direction. Unless otherwise specified, the shape viewed from the Z direction, in other words, the shape along the XY plane defined by the X direction and the Y direction, is referred to as the planar shape. Also, the planar view from the Z direction is simply referred to as the planar view.

[0033] The housing 120 forms a single container. The housing 120 is formed of a metal material. The housing 120 is formed by, for example, aluminum die casting. The housing 120 may be referred to as a metal housing. The housing 120 has a bottom 110 and a side wall 115 that forms an annular shape. The bottom 110 has a flat shape with a small thickness in the Z direction. The bottom 110 has a front surface 110A and a back surface 110B that are aligned in the Z direction. The bottom 110 has a flow path 117 between the front surface 110A and the back surface 110B through which a refrigerant passes. The refrigerant flows through the flow path 117, so that the electrical components fixed to the bottom 110 can be efficiently cooled. The smoothing capacitor 20 and the Y capacitor 100 are fixed to the bottom 110. Therefore, the heat of the smoothing capacitor 20 and the Y capacitor 100 can be efficiently cooled to the bottom 110.

[0034] The side wall 115 stands up in an annular shape away from the surface 110A. The side wall 115 has a first side wall 111 and a second side wall 112 aligned in the X direction, and a third side wall 113 and a fourth side wall 114 aligned in the Y direction. The side wall 115 is continuous in the clockwise direction with the first side wall 111, the third side wall 113, the second side wall 112, and the fourth side wall 114 in this order. A storage space 121 is formed in the housing 120 by the bottom 110 and the side wall 115. The inverter 11 and the smoothing capacitor 20 are stored in this storage space 121.

[0035] In addition, parts of power supply bus bars 140, 150 are fixed to back surface 110B. The remainder of power supply bus bars 140, 150 are provided on front surface 110A. Inverter 11 and smoothing capacitor 20 are electrically connected by power supply bus bars 140, 150 on the front surface 110A side.

[0036] Ends of power supply bus bars 140, 150 on the back surface 110B side are connected to ends of power supply bus bars 140, 150 on the front surface 110A side. Another end of power supply bus bars 140, 150 on the back surface 110B side is provided with a power connector connected to the high-voltage battery 2. This allows power to be supplied from the high-voltage battery 2 to the Y capacitor 100, the smoothing capacitor 20, and the inverter 11 via the power supply bus bars 140, 150.

[0037] The power bus bars 140, 150 have four conductive parts, namely, first conductive parts 141, 151, second conductive parts 142, 152, third conductive parts 143, 153, and fourth conductive parts 144, 154. The first conductive parts 141, 151 extend in the Y direction from the third side wall 113 toward the fourth side wall 114. A power connector is connected to the end parts of the first conductive parts 141, 151 on the third side wall 113 side. The second conductive parts 142, 152 are connected to the end parts of the first conductive parts 141, 151 on the fourth side wall 114 side.

[0038] The second conductive parts 142, 152 extend in the X direction toward the first side wall 111. The third conductive parts 143, 153 are connected to the ends of the second conductive parts 142, 152 on the first side wall 111 side. The third conductive parts 143, 153 extend in the Y direction toward the fourth side wall 114. The fourth conductive parts 144, 154 are connected to the ends of the third conductive parts 143, 153 on the fourth side wall 114 side. The fourth conductive parts 144, 154 extend in the X direction toward the second side wall 112. The ends of the fourth conductive parts 144, 154 on the second side wall 112 side are connected to the ends of the positive electrode side power bus bar 140 and the negative electrode side power bus bar 150 on the surface 110A side.

[0039] The conductive portions 141-143 of the positive power supply bus bar 140 are provided closer to the second side wall 112 than the conductive portions 151-153 of the negative power supply bus bar 150. The positive Y capacitor 100A is arranged closer to the second side wall 112 than the conductive portions 141-143. The negative Y capacitor 100B is arranged closer to the first side wall 111 than the conductive portions 151-153. As an example, the capacitor 1000 is fixed to the back surface 110B via fastening members 91, 92, as well as bolts, adhesive, or the like (not shown).

[0040] <Positive Y capacitor> A tip 163 of a side wall 162 of the positive electrode side case 160 is provided on the opposite side to a tip 116 of a side wall 115 of the housing 120 in the Z direction. The three positive electrode side elements 31, 32, 33 are lined up in the X direction in the internal space of the positive electrode side case 160. As an example, the three positive electrode side elements 31, 32, 33 are lined up from the first side wall 111 toward the second side wall 112 in the order of the positive electrode side first element 31, the positive electrode side second element 32, and the positive electrode side third element 33. The positive electrode side leads 31A, 32A, 33A and the positive electrode side G leads 31B, 32B, 33B extend in the Z direction from the element portions of the positive electrode side elements 31, 32, 33.

[0041] The three positive electrode side elements 31, 32, 33 are arranged such that the first positive electrode lead 31A, the second positive electrode lead 32A, and the third positive electrode lead 33A are adjacent to each other in the Y direction. The three positive electrode side elements 31, 32, 33 are arranged such that the first positive electrode lead 31B, the second positive electrode lead 32B, and the third positive electrode lead 33B are adjacent to each other in the Y direction. The positive electrode side leads 31A, 32A, 33A are provided closer to the third side wall 113 than the positive electrode side G leads 31B, 32B, 33B.

[0042] The positive electrode side Y capacitor bus bar 30 has a thickness in the Z direction smaller than that of the positive electrode side power supply bus bar 140. In other words, the plate thickness of the positive electrode side Y capacitor bus bar 30 is smaller than that of the positive electrode side power supply bus bar 140. The positive electrode side first bus bar 50 electrically connects the positive electrode of the high voltage battery 2 to the positive electrode side leads 31A, 32A, 33A. The positive electrode side first bus bar 50 has a comb shape having a handle extending in the Y direction. The positive electrode side first bus bar 50 has a positive electrode side first extension part 51 corresponding to the handle and three positive electrode side second extension parts 52, 53, 54 corresponding to the teeth. One end of the positive electrode side first extension part 51 is connected to the third conductive part 143 by welding or the like.

[0043] The positive electrode first extension 51 is provided between the positive electrode leads 31A, 32A, 33A and the positive electrode G leads 31B, 32B, 33B in the Y direction. The positive electrode first extension 51 extends from the connection portion with the third conductive portion 143 toward the second side wall 112 in the X direction. The positive electrode first extension 51 is farther away from the rear surface 110B than the tip 163 of the positive electrode case 160 and the upper ends of the positive electrode elements 31, 32, 33. The positive electrode elements 31, 32, 33 are provided closer to the rear surface 110B than the positive electrode first extension 51. The positive electrode first extension 51 extends from the connection portion with the third conductive portion 143 to a position overlapping the tip 163 and the upper ends of the element portions of the positive electrode elements 31, 32, 33.

[0044] The three positive electrode side second extensions 52, 53, 54 are integrally connected to the positive electrode side first extension 51 at positions overlapping the positive electrode side elements 31, 32, 33. The three positive electrode side second extensions 52, 53, 54 are a first parallel portion 52, a second parallel portion 53, and a third parallel portion 54 that are parallel to each other in the X direction. The first parallel portion 52 is integrally connected to the positive electrode side first element 31 at a position overlapping the positive electrode side first element. The second parallel portion 53 is integrally connected to the positive electrode side second element 32 at a position overlapping the positive electrode side second element. The third parallel portion 54 is integrally connected to the positive electrode side third element 33 at a position overlapping the positive electrode side third element. The three positive electrode side second extensions 52, 53, 54 extend in the Y direction from the positive electrode side first extension 51 toward the corresponding positive electrode side leads 31A, 32A, 33A.

[0045] Through holes for passing the positive electrode leads 31A, 32A, 33A are formed at the tips of the three positive electrode second extensions 52, 53, 54. The corresponding positive electrode leads 31A, 32A, 33A are inserted into the through holes and soldered. This electrically connects the positive electrode second extensions 52, 53, 54 and the positive electrode elements 31, 32, 33.

[0046] Moreover, one end of the positive electrode side fixed busbar 55 is integrally connected to the positive electrode side first extension portion 51. In this embodiment, one end of the positive electrode side first extension portion 51 is connected between the connection portion with the third conductive portion 143 and the connection portion with the first parallel portion 52. The positive electrode side first extension portion 51 has a long side in the X direction and a short side in the Y direction. The positive electrode side first extension portion 51 has ends in the X direction and the Y direction. As an example, the positive electrode side fixed busbar 55 is integrally connected to the Y direction end of the positive electrode side first extension portion 51. Note that the fixing location of the positive electrode side fixed busbar 55 is not limited as long as it is provided on the positive electrode side first extension portion 51.

[0047] The positive side fixed busbar 55 extends in the Z direction from the positive side first extension portion 51 toward the back surface 110B. As shown in Fig. 5, the positive side first extension portion 51 and the positive side fixed busbar 55 are substantially L-shaped in cross section. The tip 56 of the positive side fixed busbar 55 is separated from the back surface 110B. A heat dissipation member 131 is provided on the back surface 110B so as to cover the tip 56 of the positive side fixed busbar 55. The heat dissipation member 131 is provided at least between the tip 56 of the positive side fixed busbar 55 and the back surface 110B.

[0048] The extending directions of the positive electrode side fixed bus bar 55, the positive electrode side leads 31A, 32A, 33A, and the positive electrode side G leads 31B, 32B, 33B are aligned with each other. The positive electrode side fixed bus bar 55 does not have to be substantially L-shaped in cross section. For example, the positive electrode side fixed bus bar 55 may be substantially Z-shaped in cross section.

[0049] The positive side second bus bar 70 electrically connects the positive side elements 31, 32, 33 and the first ground 90A. The positive side second bus bar 70 also has a comb shape with a handle extending in the Y direction. The positive side second bus bar 70 has a positive side third extension part 71 corresponding to the handle, and three positive side fourth extension parts 72, 73, 74 corresponding to the teeth. A fastened part 75 on which a fastening member 91 is provided is provided at one end of the positive side third extension part 71. The fastened part 75 is electrically connected to the first ground 90A via the fastening member 91.

[0050] The positive electrode side third extension 71 is provided between the positive electrode side leads 31A, 32A, 33A and the positive electrode side G leads 31B, 32B, 33B in the Y direction. The positive electrode side third extension 71 extends from the connection part with the bottom 110 toward the first side wall 111 in the X direction. The positive electrode side third extension 71 is also farther away from the back surface 110B than the tip 163 and the upper ends of the positive electrode side elements 31, 32, 33. The positive electrode side elements 31, 32, 33 are provided closer to the back surface 110B than the positive electrode side third extension 71. The positive electrode side third extension 71 extends from the connection part with the bottom 110 to a position overlapping the tip 163 and the upper ends of the positive electrode side elements 31, 32, 33.

[0051] The three positive side fourth extensions 72, 73, 74 are integrally connected to the extension 71 at positions overlapping the positive side elements 31, 32, 33. The three positive side fourth extensions 72, 73, 74 are the fourth parallel portion 72, the fifth parallel portion 73, and the sixth parallel portion 74, which are parallel to each other in the X direction. The fourth parallel portion 72 is integrally connected to the positive side first element 31 at a position overlapping the positive side element 32. The fifth parallel portion 73 is integrally connected to the positive side second element 32 at a position overlapping the positive side element 33. The three positive side fourth extensions 72, 73, 74 extend in the Y direction from the positive side third extension 71 toward the corresponding positive side G leads 31B, 32B, 33B.

[0052] Through holes are formed at the tips of the three positive electrode side fourth extensions 72, 73, 74, through which the positive electrode side G leads 31B, 32B, 33B pass. The leads 31B, 32B, 33B corresponding to the through holes are inserted and soldered. This electrically connects the positive electrode side fourth extensions 72, 73, 74 to the positive electrode side elements 31, 32, 33. The three positive electrode side elements 31, 32, 33 are connected in parallel.

[0053] <Negative Y capacitor> The configuration of the negative Y capacitor 100B is similar to that of the positive Y capacitor 100A. The arrangement of the components of the negative Y capacitor 100B is two-fold symmetric with the arrangement of the corresponding components of the positive Y capacitor 100A, with the Z axis as the rotation axis. One end of the negative first bus bar 60 is connected to the third conductive part 153 of the negative power supply bus bar 150 by welding or the like.

[0054] The negative first busbar 60 also has a negative first extension 61, three negative second extensions 62, 63, 64, and a negative fixed busbar 65. The negative fixed busbar 65 has a tip 66. The negative second busbar 80 has a negative third extension 81, three negative fourth extensions 82, 83, 84, and a fastened portion 85. The plate thickness of the negative Y capacitor busbar 40 is thinner than the plate thickness of the negative power supply busbar 150. The negative first extension 61 corresponds to the positive first extension 51. The negative second extensions 62, 63, 64 correspond to the positive second extensions 52, 53, 64. The negative fixed busbar 65 corresponds to the positive fixed busbar 55. The negative third extension 81 corresponds to the positive third extension 71. The negative electrode side fourth extension parts 82, 83, 84 correspond to the positive electrode side fourth extension parts 72, 73, 74. The fastened part 85 corresponds to the fastened part 75.

[0055] <Action and effect> In the following, the effects of the positive Y capacitor 100A will be described as a representative example. The effects of the negative Y capacitor 100B are similar. The positive first bus bar 50 connects the positive elements 31, 32, and 33 to the positive power bus bar 140. The positive second bus bar 70 connects the positive elements 31, 32, and 33 to the first ground 90A. The positive fixed bus bar 55 extends from the positive first bus bar 50 toward the bottom 110 and is fixed to the bottom 110. A heat dissipation member 131 is provided between the positive fixed bus bar 55 and the bottom 110.

[0056] A high current flows through the positive power supply bus bar 140 based on the high voltage supplied from the high voltage battery 2. Because a high current flows through the positive power supply bus bar 140, the positive power supply bus bar 140 generates heat and reaches a high temperature. One end of the positive side first bus bar 50 is connected to the positive side power supply bus bar 140. The positive side elements 31, 32, and 33 are connected to the other end of the positive side first bus bar 50. As a result, heat is transferred from the positive side power supply bus bar 140 to the positive side elements 31, 32, and 33 via the positive side first bus bar 50.

[0057] In this embodiment, the positive side first bus bar 50 is provided with a positive side fixed bus bar 55. The positive side fixed bus bar 55 is fixed to the bottom 110 via a heat dissipation member 131. This allows heat to be easily transferred from the positive side fixed bus bar 55 to the bottom 110. Accordingly, the transfer of heat to the positive side elements 31, 32, and 33 is suppressed. A rise in temperature of the positive side elements 31, 32, and 33 is suppressed.

[0058] In recent years, with the increase in switching speed in the inverter 11 and the stricter EMC standards, stricter noise reduction is required than ever before. To remove noise, a Y capacitor 100 is mounted on an electric device 10 such as a power conversion device. In general, a capacitor is required to be used at or below its heat resistance, taking into account self-heating and heat dissipation. The Y capacitor 100 is also required to be used at or below its heat resistance. In particular, the Y capacitor 100 has the lowest heat resistance among the components mounted on the electric device 10. For this reason, it is significant to suppress heat transfer to the Y capacitor 100 and suppress the temperature rise of the Y capacitor 100.

[0059] A positive side fixed bus bar 55 is provided between the connection portion of the positive side first bus bar 50 with the positive side power supply bus bar 140 and the connection portion with the positive side elements 31, 32, and 33. With this, heat is transferred from the positive side fixed bus bar 55 to the bottom 110 before being transferred to the positive side elements 31, 32, and 33. Therefore, heat transfer from the positive side power supply bus bar 140 to the positive side elements 31, 32, and 33 can be efficiently suppressed.

[0060] A plurality of elements 31, 32, 33 are aligned in the Y direction, and are connected in parallel to the first positive bus bar 50 and the second positive bus bar 70 via solders 34, 35. This makes it possible to suppress vibration of the first positive bus bar 50 and the second positive bus bar 70 even if the lengths of the first positive extension portion 51 and the third positive extension portion 71 are increased. Heat transfer to the plurality of positive elements 31, 32, 33 can be suppressed almost simultaneously.

[0061] The positive electrode first bus bar 50 and the positive electrode second bus bar 70 are disposed farther from the bottom 110 than the positive electrode elements 31, 32, 33. The extension direction of the positive electrode fixed bus bar 55, the extension direction of the positive electrode leads 31A, 32A, 33A, and the extension direction of the positive electrode G leads 31B, 32B, 33B are the same. Vibrations are absorbed by the positive electrode fixed bus bar 55 and the heat dissipation member 131, so that vibrations of the positive electrode leads 31A, 32A, 33A and the positive electrode G leads 31B, 32B, 33B are suppressed. Stress concentration on the solders 34, 35 is suppressed.

[0062] A flow path 117 for circulating a refrigerant is formed in the bottom 110. The refrigerant cools the Y condenser 100. This can improve the heat dissipation effect to the bottom 110.

[0063] The plate thickness of positive electrode side Y capacitor bus bar 30 is thinner than the plate thickness of positive electrode side power supply bus bar 140. This makes it difficult for heat from positive electrode side power supply bus bar 140 to be transferred to positive electrode side Y capacitor bus bar 30. Accordingly, heat transfer from positive electrode side power supply bus bar 140 to positive electrode side elements 31, 32, 33 is suppressed.

[0064] The positive electrode first busbar 50 has a positive electrode first extension 51 and positive electrode second extensions 52, 53, 54. One end of the positive electrode first extension 51 is connected to the positive electrode first busbar 50 and extends in the X direction. One end of the positive electrode second extensions 52, 53, 54 is connected to the positive electrode first extension 51 and extends toward the positive electrode leads 31A, 32A, 33A. The positive electrode second busbar 70 has a positive electrode third extension 71 and positive electrode fourth extensions 72, 73, 74. One end of the positive electrode third extension 71 is connected to the first ground 90A and extends in the X direction. The positive electrode side fourth extension parts 72, 73, 74 have one end connected to the positive electrode side third extension part 71 and extend toward the positive electrode side G leads 31B, 32B, 33B. This allows the lengths of the positive electrode side second extension parts 52, 53, 54 and the positive electrode side fourth extension parts 72, 73, 74 to be adjusted to match the size of the positive electrode side elements 31, 32, 33. This increases the degree of freedom in design. The same applies to the negative electrode side Y capacitor 100B.

[0065] The fourth positive extensions 72, 73, 74 of the positive Y capacitor bus bar 30 are connected to a first ground 90A. The fourth negative extensions 81, 82, 83 of the negative Y capacitor bus bar 40 are connected to a second ground 90B. Since the positive Y capacitor bus bar 30 and the negative Y capacitor bus bar 40 are connected to the corresponding grounds 90A, 90B separately, the degree of freedom in design is increased.

[0066] Second embodiment In the first embodiment, a configuration has been described in which the fixed busbars 55, 65 are integrally connected to the first extension portions 51, 61 on the corresponding pole side. However, the connection positions of the fixed busbars 55, 65 are not limited thereto. For example, the fixed busbars 55, 65 may be fixed to the third extension portions 71, 81 on the corresponding pole side.

[0067] 8 is a plan view of the electric device 10 in the second embodiment as viewed from the back surface 110B. The positive electrode side fixed busbar 55 is fixed between the connection portion of the positive electrode side third extension portion 71 with the sixth parallel portion 74 and the connection portion of the fastened portion 75. The positive electrode side fixed busbar 55 extends in the Z direction from that position toward the bottom 110. The positive electrode side fixed busbar 55 is fixed to the bottom 110 via a heat dissipation member 131. The negative electrode side fixed busbar 65 is similar to the positive electrode side fixed busbar 55. This also provides the same effects as the first embodiment.

[0068] Although the present disclosure has been described based on the embodiment, it is understood that the present disclosure is not limited to the embodiment or structure. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, although various combinations and forms are shown in the present disclosure, other combinations and forms including only one element, more than one, or less than one element are also within the scope and concept of the present disclosure. [Explanation of symbols]

[0069] 100A, 100B capacitor, 11 electrical component, 110 bottom, 120 metal housing, 131, 132 heat dissipation member, 140, 150 power bus bar, 2 power source, 20 electrical component, 30 positive electrode side capacitor bus bar, 30 positive electrode side capacitor bus bar, 40 negative electrode side capacitor bus bar, 31, 32, 33, 41, 42, 43 elements, 31A, 32A, 33A, 41A, 42A, 43A one end lead, 31B, 32B, 33B, 41B, 42B, 43B other end lead, 34, 35, 44, 45 solder, 50, 60: first bus bar; 51, 61: first extension; 52, 53, 54, 62, 63, 64: second extension; 55, 65: fixed bus bar; 70, 80 second busbar; 71, 81 third extension; 72, 73, 74, 82, 83, 84 fourth extension; 90A, 90B ground; X one-way.

[0070] (Disclosure of technical ideas) This specification discloses multiple technical ideas described in the following multiple dependent claims. Some of the claims may be described in a multiple dependent form, where the subsequent claim alternatively refers to the preceding claim. Furthermore, some of the claims may be described in a multiple dependent form, where the subsequent claim alternatively refers to the preceding claim. The claims described in these multiple dependent forms define multiple technical ideas.

[0071] (Technical thought 1) a power bus bar (140, 150) connected to the power source (2) and the electrical components (11, 20); A capacitor (100A, 100B) connected to the power bus bar and to ground (90A, 90B); a metal housing (120) having a bottom (110) to which the capacitor is fixed and which is connected to the ground; A heat dissipation member (131, 132) having insulating properties and a higher thermal conductivity than air, The capacitor is Elements (31, 32, 33, 41, 42, 43), a capacitor bus bar (30, 40) including a first bus bar (50, 60) connecting the element and the power bus bar, a second bus bar (70, 80) connecting the element and the ground, and a fixed bus bar (55, 65) extending from the first bus bar or the second bus bar toward the bottom and fixed to the bottom; An electric device, wherein the heat dissipation member is provided between the fixed bus bar and the bottom.

[0072] (Technical thought 2) The first bus bar extends in one direction (X) away from the power bus bar, The electrical device according to Technical Idea 1, wherein the fixed bus bar is provided between a connection portion of the first bus bar with the power supply bus bar and a connection portion of the first bus bar with the element.

[0073] (Technical Thought 3) A plurality of the elements are provided, A plurality of the elements are arranged in the one direction, The electrical device according to Technical Idea 2, wherein a plurality of the elements are connected in parallel between the first bus bar and the second bus bar via solder (34, 35, 44, 45).

[0074] (Technical Thought 4) a plurality of the elements are disposed closer to the bottom than the first bus bar and the second bus bar; The element comprises: a first lead (31A, 32A, 33A, 41A, 42A, 43A) solder-connected to the first bus bar; and second leads (31B, 32B, 33B, 41B, 42B, 43B) solder-connected to the second bus bars, The electrical device according to Technical Idea 3, wherein the direction in which the first lead and the second lead extend is the same as the direction in which the fixed bus bar extends.

[0075] (Technical Thought 5) The electric device according to any one of Technical Ideas 1 to 4, wherein a refrigerant for cooling at least the condenser flows through the bottom.

[0076] (Technical Thought 6) The electric device according to any one of Technical Concepts 1 to 5, wherein the plate thickness of the capacitor bus bar is thinner than the plate thickness of the power supply bus bar.

[0077] (Technical Thought 7) the first bus bar has a first extension portion (51, 61) having one end connected to the power bus bar and extending in the one direction, and a second extension portion (52, 53, 54, 62, 63, 64) extending from the first extension portion and connected to the one end lead, The electrical device described in any one of technical ideas 2 to 6, wherein the second bus bar has a third extension portion (71, 81) having one end connected to the ground and extending in the one direction, and a fourth extension portion (72, 73, 74, 82, 83, 84) extending from the third extension portion and connected to the other end lead.

[0078] (Technical Thought 8) The capacitor bus bar includes: A positive-side capacitor bus bar (30) connected to a positive electrode of the power source, and a negative-side capacitor bus bar (40) connected to a negative electrode of the power source, The electrical equipment described in Technical Idea 7, wherein the fourth extension portion of the positive side capacitor busbar and the fourth extension portion of the negative side capacitor busbar are separate and connected to the corresponding grounds, respectively.

Claims

1. a power bus bar (140, 150) connected to the power source (2) and the electrical components (11, 20); A capacitor (100A, 100B) connected to the power bus bar and to ground (90A, 90B); a metal housing (120) having a bottom (110) to which the capacitor is fixed and which is connected to the ground; A heat dissipation member (131, 132) having insulating properties and a higher thermal conductivity than air, The capacitor is Elements (31, 32, 33, 41, 42, 43), The capacitor busbar (30, 40) includes a first busbar (50, 60) connecting the element and the power busbar, a second busbar (70, 80) connecting the element and the ground, and a fixed busbar (55, 65) extending from the first busbar or the second busbar toward the bottom and fixed to the bottom, An electric device, wherein the heat dissipation member is provided between the fixed bus bar and the bottom.

2. The first bus bar extends in one direction (X) away from the power bus bar; The electric device according to claim 1 , wherein the fixed bus bar is provided between a portion of the first bus bar that is connected to the power supply bus bar and a portion of the first bus bar that is connected to the element.

3. A plurality of the elements are provided, A plurality of the elements are arranged in the one direction, 3. The electrical device of claim 2, wherein a plurality of said elements are connected in parallel between said first bus bar and said second bus bar via solder (34, 35, 44, 45).

4. a plurality of the elements are disposed closer to the bottom than the first bus bar and the second bus bar; The element comprises: One end lead (31A, 32A, 33A, 41A, 42A, 43A) solder-connected to the first bus bar; and a second end lead (31B, 32B, 33B, 41B, 42B, 43B) solder-connected to the second bus bar, The electric device according to claim 3 , wherein a direction in which the one end lead and the other end lead extend is the same as a direction in which the fixed bus bar extends.

5. 5. The electric device according to claim 1, wherein a refrigerant for cooling at least the condenser flows through the bottom.

6. The electrical device according to any one of claims 1 to 4, wherein the plate thickness of the capacitor bus bar is thinner than the plate thickness of the power supply bus bar.

7. The first bus bar has a first extension portion (51, 61) having one end connected to the power bus bar and extending in the one direction, and a second extension portion (52, 53, 54, 62, 63, 64) extending from the first extension portion and connected to the one end lead, The electrical device according to claim 4, wherein the second bus bar has a third extension portion (71, 81) having one end connected to the ground and extending in the one direction, and a fourth extension portion (72, 73, 74, 82, 83, 84) extending from the third extension portion and connected to the other end lead.

8. The capacitor bus bar includes: A positive-side capacitor bus bar (30) connected to the positive electrode of the power source, and a negative-side capacitor bus bar (40) connected to the negative electrode of the power source, The electric device according to claim 7 , wherein the fourth extension portion of the positive capacitor bus bar and the fourth extension portion of the negative capacitor bus bar are separate and connected to the corresponding ground, respectively.

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