JP2015084609A - Cooling device for connecting conductor and power conversion device using the same - Google Patents

Abstract

It is possible to efficiently cool a connection conductor such as a bus bar whose temperature has risen due to heat received from an electric device such as a semiconductor element and heat generation of the connection conductor itself, and can be small in size and shorten the length of the connection conductor. A cooling device for a connection conductor and a power conversion device using the cooling device for the connection conductor are provided. A first connection conductor 2 derived from a first electric device 1 and having a first connection portion 2a, a cooler 5, and the cooler and the first connection portion are provided. Any one of the heat transfer body 3 that transfers heat of the first connection conductor to the cooler, and between the heat transfer body and the cooler and between the heat transfer body and the first connection conductor. And an electrically insulating heat transfer material 4 interposed therebetween. [Selection] Figure 2

Description

  The present invention relates to a cooling device for a connection conductor that is preferably used for cooling a bus bar of a power conversion device that requires heat dissipation measures, and a power conversion device using the same.

Conventionally, in order to cool a bus bar that generates heat, a method of dissipating heat to the air by installing fins on the bus bar is known (for example, see Patent Document 1).
Further, the temperature T1 of the bus bar itself is inversely proportional to the cross-sectional area S1 of the bus bar, and is a term proportional to the bus bar length L and a term inversely proportional to the surface area S2 of the bus bar, as expressed by the following equation (7). Since the heat value P is multiplied by the sum, there is a known method for suppressing the temperature of the bus bar by increasing the cross-sectional area S1 of the bus bar, shortening the length L of the bus bar, or increasing the surface area S2 of the bus bar. It has been.
ΔT = Rt × P (1)
Rt = R1 + R2 (2)
R1 = L / (S1 × λ1) (3)
R2 = 1 / (h × S2) (4)
ΔT = T1-T2 (5)
Substituting Equations (3) and (4) into Equation (2) Rt = L / (S1 × λ1) + 1 / (h × S2) (6)
Substituting Equations (5) and (6) into Equation (1) T1-T2 = {L / (S1 × λ1) + 1 / (h × S2)} × P
T1 = {L / (S1 × λ1) + 1 / (h × S2)} × P + T2 (7)
Rt: Thermal resistance (K / W)
P: calorific value (W)
T1: Bus bar temperature (K)
T2: Bus bar ambient atmosphere temperature (K)
R1: Thermal resistance of bus bar (K / W)
R2: Ambient (air, etc.) thermal resistance (K / W)
L: Bus bar length (m)
S1: Bus bar cross-sectional area (m ² )
λ1: Thermal conductivity of bus bar material (W / m · K)
h: Heat transfer coefficient of surroundings (air, etc.) (W / m ² · K)
S2: Surface area around the bus bar (m ² )

JP-A-6-162827 (first page, FIG. 1)

In the conventional connection conductor cooling device as described above, in an application in which a large current is passed by a method of expanding the surface area by installing fins on the bus bar, a very large space is required, which leads to an increase in the size of the entire device. There was a problem. Even if a large fin can be installed, if the heat of the bus bar is radiated to the air, the heat transfer coefficient is limited, so the heat of the generated bus bar is not transmitted to the tip of the fin, and the expected heat dissipation effect cannot be obtained. There was a problem. In addition, when enlarging the cross-sectional area of the bus bar, there is a problem that not only increases the size of the apparatus but also increases the weight when it is assumed that a high-power current flows. Further, even if the cross-sectional area of the bus bar can be enlarged, the cost of the bus bar itself becomes very expensive, and there is a problem that leads to an increase in the cost of the entire apparatus. In addition, in a connection part to the bus bar, for example, a semiconductor element, the heat of the generated semiconductor element is received by the bus bar, so that the temperature of the bus bar further increases due to the received heat in addition to the temperature increase due to the heat generation of the bus bar itself. There was a problem.
On the other hand, high power semiconductor elements tend to be used at higher temperatures due to the high temperature of semiconductors made of Si today and the development of SiC (silicon carbide), and the bus bars connected to the semiconductor elements are also from the semiconductor elements. Naturally, the received heat tends to increase. However, it may be connected to the part that wants to suppress heat reception on the opposite side of the bus bar connected to the semiconductor element, such as a film capacitor or connector, so it is necessary to suppress the temperature rise of the bus bar and minimize heat reception of the capacitor or connector etc. There is.
Further, in a high-power power conversion device, for example, an inverter, it is necessary to connect two parts of a switching semiconductor element and a smoothing capacitor with a bus bar. When the distance between the bus bars for connection increases, ESL (equivalent series inductance) increases, and a large surge voltage is generated when the switching semiconductor element is switched. When a surge voltage exceeding the allowable voltage of the switching semiconductor element is generated and the generated surge voltage flows to the switching semiconductor element, the switching semiconductor element is damaged. In addition, a large surge voltage leads to an increase in radiation noise and conduction noise. As described above, it is necessary to securely connect the smoothing capacitor and the switching semiconductor element so as to minimize the length of the bus bar and allow a large current to flow.

  The present invention has been made to solve the above-described problems, and efficiently cools a connection conductor such as a bus bar whose temperature has risen due to heat received from an electric device such as a semiconductor element and heat generated by the connection conductor itself. An object of the present invention is to provide a cooling device for a connection conductor that can be reduced in size and that can shorten the length of the connection conductor, and a power converter using the cooling device for the connection conductor.

A cooling device for a connection conductor according to the present invention includes a first connection conductor derived from a first electrical device and having a first connection portion, a cooler, and between the cooler and the first connection portion. Any one of a heat transfer body that is provided on the heat transfer body and transfers heat of the first connection conductor to the cooler, between the heat transfer body and the cooler, and between the heat transfer body and the first connection conductor. And an electrically insulative heat transfer material interposed therebetween.
In addition, a power converter using the connection conductor cooling device according to the present invention includes a first connection conductor derived from the first electric device and having a first connection portion, a cooler, the cooler, and the cooler. A heat transfer body provided between the first connection portion and transferring heat of the first connection conductor to the cooler; between the heat transfer body and the cooler; and the heat transfer body and the first An electrical insulating heat transfer material interposed between any one of the connection conductors, and a cooling device for the connection conductor. A second connecting conductor having a second connecting portion connected to the first connecting portion is provided, wherein the first electric device is made of a switching semiconductor element, and the second electric device is made of a capacitor. It is what.

According to the cooling device for a connection conductor according to the present invention, heat transmitted from the electrical device to the connection conductor such as a bus bar, and in addition to this, heat generated in the connection conductor itself is transmitted from the first connection portion to the heat transfer body and the electrical conductor. It is transmitted to the cooler via the insulating heat transfer material by solid heat conduction and cooled by the cooler, so that it can be efficiently cooled, and the length of the connecting conductor and the heat transfer path are shortened. Thus, the cooling efficiency can be improved and the size can be reduced.
Moreover, according to the power converter using the cooling device for a connection conductor according to the present invention, heat generated from the switching semiconductor element and transmitted to the first connection conductor and heat generated by the first connection conductor itself are generated. Since it is transmitted by the solid heat conduction from the first connecting portion to the cooler via the heat transfer body and the electrically insulating heat transfer material and cooled by the cooler, the generated heat can be efficiently cooled. In addition, since the length of each connection conductor and the heat transfer path can be easily shortened, it is easy to improve the cooling characteristics, reduce the size, and improve the electrical characteristics such as the equivalent series inductance.

It is a perspective view which shows the principal part of the vehicle-mounted power converter device using the cooling device of the connection conductor by Embodiment 1 of this invention and the cooling device of the connection conductor. It is a longitudinal cross-sectional view which shows the part of the cooling device of the connection conductor shown by FIG. 1 in detail. It is a disassembled perspective view which shows the part of the cooling device of the connection conductor shown by FIG. 2 in detail.

Embodiment 1 FIG.
1 is a perspective view showing a main part of a cooling device for a connection conductor and a vehicle-mounted power converter using the cooling device for the connection conductor according to Embodiment 1 of the present invention, and FIG. 2 is a connection conductor shown in FIG. FIG. 3 is an exploded perspective view showing in detail a cooling device portion of the connection conductor shown in FIG. 2. In the figure, the cooling device for the connection conductor is derived from the switching semiconductor element 1 which is a first electric device using, for example, an SiC semiconductor element used in a power conversion device such as an inverter, and has a first connection portion 2a. The bus bar 2 that is the first connection conductor that requires heat dissipation and the one end 3a are in close contact with the cooler 5 made of aluminum die cast through the electrically insulating heat transfer material 4, and the other end 3b is the first connection. And a heat transfer body 3 coupled to the portion 2a. The form of the cooler 5 is not particularly limited. For example, the cooler 5 may be a part of a casing constituting the in-vehicle power conversion device, or a heat sink or heat prepared separately from the casing. Known techniques such as those using pipes and heat radiating means, and those in which a fluid such as a liquid is circulated between the heat radiator and cooled can be appropriately selected and used.

  The electrically insulating heat transfer material 4 is provided for electrical insulation and heat dissipation between the bus bar 2 and the cooler 5, and in this example, an elastic insulating heat dissipation member is used. Is not to be done. For example, a known alternative method such as forming the electrically insulating heat transfer material 4 with a tape-like or sheet-like insulating resin film at a place where the heat transfer body 3 and the cooler 5 come into contact may be employed. Moreover, the installation position of the electrically insulating heat transfer material 4 may be between the other end 3 b (upper end in the drawing) of the heat transfer body 3 and the bus bar 2. In this case, a heat transfer material such as grease with improved heat conductivity, a tolerance absorbing member, or the like may be added between the heat transfer body 3 and the cooler 5. Alternatively, an insulating resin film having electrical insulation may be used as the electrically insulating heat transfer material 4, and heat-radiating grease may be applied between the insulating resin film and the cooler 5.

  In addition, Embodiment 1 shown in FIGS. 1 to 3 shows a main part of an in-vehicle power conversion device using the connection conductor cooling device together with the connection conductor cooling device. Specifically, the second connection portion which is an inverter and is derived from the smoothing capacitor 6 which is the second electric device and connected to the first connection portion 2a of the bus bar 2 which is the first connection conductor. A bus bar 7 as a second connecting conductor having 7a is provided. The 1st connection part 2a and the 2nd connection part 7a are comprised using the penetration hole for inserting the volt | bolt 81B which comprises the fastener 81 mentioned later. And in the example of this Embodiment 1, the connection fixing part 8a which fixes the 1st connection part 2a and the 2nd connection part 7a with the fastener 81 was provided in the upper surface part in the cooling device of the connection conductor. A terminal block 8 is provided, and the terminal block 8 has a cooler so that one end 3a of the heat transfer body 3 on the cooler 5 side is in close contact with the cooler 5 via the electrically insulating heat transfer material 4 by the back surface portion 8b. 5 is fixed to a boss 5a provided on the surface of 5 by bolts 5b.

  The terminal block 8 includes a base body 80 that is formed of an insulating resin and is provided with a hexagonal hole 8c (shown in FIG. 3) that accommodates and holds a nut 81A that constitutes one of the fasteners 81. A groove 80a (illustrated in FIG. 2) is formed on one side surface portion. The groove 80a may be a recess. In addition, the bus bar 2 and the bus bar 7 are provided two by two so as to face each other, and the connection fixing portion 8a and the heat transfer body 3 are also provided at two locations with a predetermined gap corresponding to the bus bar 2 and the bus bar 7, The number of bus bars and the number of connection fixing portions 8a are not particularly limited as long as they are one or more. The heat transfer body 3 is made of the same material as the bus bar 2, for example, a good conductor of electricity and heat, such as copper, aluminum, and alloys thereof.

  The heat transfer body 3 is formed in a substantially U shape so as to surround the three sides of the upper surface portion, one side surface portion, and the rear surface portion 8b (shown in FIG. 2) of the connection fixing portion 8a of the terminal block 8. Further, an intermediate portion between the one end portion 3a on the cooler 5 side and the other end portion 3b on the first connection portion 2a side is substantially arranged so as to absorb a change in dimensions due to variations within a tolerance range. An elastically deformable portion 3 c that is bent in a “<” shape is formed. The groove 80a provided in the base body 80 is configured to receive the protruding portion of the elastically deforming portion 3c and absorb the change in dimensions. The other end 3b of the heat transfer body 3 is provided with an insertion hole for inserting the nut 81A.

  Next, the assembly order will be described. In the terminal block 8, a nut 81A is previously inserted into the hexagonal hole 8c of the base body 80, and then the U-shaped heat transfer body 3 is slid obliquely from the left side of the sheet of FIG. Put it on. When the heat transfer body 3 is attached to the base body 80, as shown in FIG. 2, one end portion 3a of the heat transfer body 3 protrudes downward from the back surface portion 8b which is the lower surface of the base body 80, and the other end portion 3b is The elastic deformation portion 3 c is located in the connection fixing portion 8 a so as to cover the upper surface of the nut 81 </ b> A, and enters the groove 80 a formed in one side surface portion of the base body 80. In addition, the shape of the elastic deformation part 3c etc. is not limited to the thing of illustration, For example, you may form in circular arc shape or you may make a protrusion direction reverse. When the protruding direction of the elastic deformation portion 3c is reversed, a portion corresponding to the groove 80a is formed by a convex portion, or the groove or the convex portion may not be provided.

One end 3a (the lower surface portion on the cooler 5 side) of the heat transfer body 3 is formed by the back surface portion 8b of the terminal block 8 when the terminal block 8 is fixed to the boss 5a of the cooler 5 with the bolt 5b. It is configured to be in close contact with the cooler 5 through the electrically insulating heat transfer material 4.
Next, the first connection portion 2a of the bus bar 2 and the second connection portion 7a of the bus bar 7 are first attached to the top of the nut 81A constituting the connection fixing portion 8a of the terminal block 8, as shown in FIG. The switching semiconductor element 1 and the capacitor 6 are disposed on the other end portion 3b of the heat transfer body 3 so as to abut against each other from the left and right sides so that the centers of the insertion holes substantially coincide with the screw holes of the nut 81A. The position of is fixed.

At this time, that is, in a state before being fastened with the bolt 81B, the variation within the dimensional tolerance is absorbed between the heat transfer body 3 and the first connection portion 2a or between the second connection portion 7a. Therefore, each member is formed in a dimensional relationship in which a gap portion G is formed.
Next, the first connecting portion 2a, the second connecting portion 7a, and the heat transfer body 3 are fastened and fixed to the nut 81A by a bolt 81B constituting the fastener 81.
In addition, the screw hole of the boss 5a provided in the cooler 5 and the screw hole of the nut 81A provided in the terminal block 8 are screw holes for metal pieces that may be generated when the bolt 5b or the bolt 81B is tightened. Each of them has a bag hole shape so as not to come out of the part.

  As described above, the cooling device for the connection conductor according to the first embodiment is the first connection conductor having the first connection portion 2a that requires heat radiation and is derived from the switching semiconductor element 1 as the first electric device. The bus bar 2, the cooler 5 made of aluminum die-casting that receives and absorbs heat, and the electrically conductive heat transfer material 4 are provided between the cooler 5 and the first connection portion 2 a, And a heat transfer body 3 formed in a substantially U-shape that transfers the heat of 2 to the cooler 5.

  According to the cooling device for a connection conductor according to the first embodiment, the heat transferred from the switching semiconductor element 1 to the bus bar 2 and further the heat generated in the bus bar 2 itself are transferred from the first connection portion 2a to the heat transfer body. 3 and the electrically insulating heat transfer material 4 are transmitted to the cooler 5 by solid heat conduction and cooled by the cooler 5, so that the structure is simple and can be efficiently cooled. As shown in the figure, the length of the bus bar 2 up to the first connection portion 2a and the length of the heat transfer body 3 serving as a heat transfer path from the first connection portion 2a to the cooler 5 can be shortened. Since it is possible easily, the bus bar 2 can be cooled in a minimum space without extending the length of the bus bar 2, and it is easy to improve the cooling efficiency. Further, by shortening the length of the bus bar 2 to the first connection portion 2a, the cooling efficiency can be improved and the size can be reduced.

  Further, a gap G is formed between the heat transfer body 3 and the heat generating bus bar 2 before fastening, and further, an elastically deformable portion 3c having a spring structure is formed on the heat transfer body 3, so that the tolerance is increased. Even if the distance between the heat transfer body 3 and the heat generating bus bar changes due to variations, the heat generating bus bar and the heat transfer body 3 can be fastened without applying an extra force to the heat generating bus bar. If, for example, the bus bar connected to the capacitor is covered with potting, the potting material is prevented from cracking due to the force applied to the bus bar when the heat generating bus bar and the heat transfer body 3 are fastened. be able to.

Moreover, even if the thickness of the heat transfer body 3 varies due to the use of the electrically insulating heat transfer material 4 having elasticity for insulation and heat dissipation under the heat transfer body 3, the electric insulation heat transfer material 4 Therefore, the variation can be absorbed and brought into close contact with the cooler 5.
Further, when the first connecting portion 2a is fastened by the bolt 81B, a metal piece is generated by rubbing the male screw and the female screw, and the generated metal piece may adhere between the electrodes and cause a short circuit. Is formed into a bag hole shape that hardly protrudes from the screw hole side of the nut 81 </ b> A, thereby eliminating the possibility of short-circuiting.

  Further, as described above, the power conversion device according to Embodiment 1 includes the cooling device for the connection conductor, and is derived from the smoothing capacitor 6 that is the second electrical device, and is connected to the first connection conductor. The present invention is applied to an inverter having a bus bar 7 as a second connection conductor having a second connection portion 7a connected to a first connection portion 2a of a certain bus bar 2.

  According to the power conversion device according to the first embodiment, since the bus bar 2 between the switching semiconductor element 1 and the smoothing capacitor 6 and the bus bar 6 can be connected in the shortest time, the equivalent series inductance is reduced and the surge voltage is reduced. The switching semiconductor element 1 can be prevented from being damaged and radiation noise and conduction noise can be prevented from increasing. In addition, the heat generated from the switching semiconductor element 1 and transmitted to the bus bar 2 and the heat generated in the bus bar 2 itself from the first connecting portion 2 a through the heat transfer body 3 and the electrically insulating heat transfer material 4 are cooled by the cooler 5. While being transmitted by solid heat conduction and cooled by the cooler 5, a part of the heat is transmitted to the capacitor 6 through the bus bar 7, so that the generated heat can be efficiently cooled. For this reason, it can be preferably used for in-vehicle use.

In addition, although the case where the first electric device is the switching semiconductor element 1 has been described, the present invention is not limited to this, and the same applies to any electric device that radiates a heat-generating portion through a connection conductor. Can do. Further, the case where the second electric device is the capacitor 6 has been described as an example. However, the present invention is not limited to this, and is not particularly limited as long as the electric device is connected to the first electric device via a connection conductor. Can be used.
Moreover, although the nut 81A and the volt | bolt 81B were used as the fastener 81 and the volt | bolt 5b was used for fixation of the terminal block 8, it is not limited to this. For example, a technique of fixing with push rivets may be employed. Moreover, you may connect by welding etc.

In addition, the heat transfer body 3 and the bus bar 2 and the bus bar 7 are configured as separate parts. However, the present invention is not limited to this. For example, the heat transfer body 3 and one or both of the bus bar 2 and the bus bar 7 are integrated. It is good.
Further, the heat transfer body 3 and the nut 81A are configured as separate parts, but the present invention is not limited to this. For example, the nut 81A is a cap nut, and the cap nut is fixed to the heat transfer body 3 by welding or the like. It may be integrated. Alternatively, the other end 3b of the heat transfer body 3 is formed by forming a bag hole shape by drawing without opening a through hole for inserting a bolt in the other end 3b of the heat transfer body 3, and cutting the tap into the bag hole. A cap nut may be integrally provided on the side, and the bus bar 2 and the bus bar 7 may be fastened to the cap nut portion of the heat transfer body 3 with bolts. In either case, the number of parts can be reduced to facilitate assembly, and the workability can be improved and the cost can be reduced.

Further, without using the terminal block 8, the boss 5a, and the bolt 5b, the first connection portion 2a, the second connection portion 7a, and the other end portion 3b of the heat transfer body 3 are fastened. The one end 3a may be brought into close contact with the cooler 5 via the electrically insulating heat transfer material 4 by other known means.
In addition, although the aluminum die casting was employ | adopted as the cooler 5, it is not limited to this. For example, a fin may be installed to improve the cooling performance. Alternatively, a known alternative method such as installing a flow path inside the cooler and cooling it by passing a gas or liquid refrigerant may be adopted.
Moreover, although the base | substrate 80 was comprised with the resin mold product, it is not limited to this. For example, the base 80 itself has a spring property, a clearance is provided between the boss 5a of the cooler 5 and a bolt 5b is tightened so that a crushing force is always applied to the electrically insulating heat transfer material 4. Good.
It goes without saying that various modifications and changes are possible within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 Switching semiconductor element (1st electric apparatus), 2 Busbar (1st connection conductor), 2a 1st connection part, 3 heat exchanger, 3a one end part, 3b other end part, 3c elastic deformation part, 4 electricity Insulating heat transfer material, 5 cooler, 5a boss, 5b bolt, 6 capacitor (second electrical device), 7 bus bar (second connection conductor), 7a second connection, 8 terminal block, 8a connection fixing Part, 8b back surface part, 8c hole, 80 base, 80a groove, 81 fastener, 81A nut, 81B bolt, G space part.

The cooling device for a connection conductor according to the present invention includes a first connection conductor having a first connection portion derived from the first electric device and requiring heat dissipation, a cooler, the cooler, and the first connection. A heat transfer body that is provided between the heat transfer body and transfers heat of the first connection conductor to the cooler, between the heat transfer body and the cooler, and between the heat transfer body and the first connection conductor. An electrically insulating heat transfer material interposed between the first connection portion and the end of the heat transfer body on the side of the first connection portion is a fastener. A cap nut portion integrally formed by drawing is provided at an end portion of the heat transfer body on the first connection portion side, and the first connection portion is a bolt. And is fastened to the cap nut portion .
Moreover, the power converter using the cooling device for the connection conductor according to the present invention includes a first connection conductor having a first connection portion that requires heat dissipation and is derived from the first electrical device, the cooler, A heat transfer body that is provided between the cooler and the first connection portion and transfers heat of the first connection conductor to the cooler; between the heat transfer body and the cooler; and the heat transfer body An electrically insulating heat transfer material interposed between the first connection conductor and the first connection conductor, and the first connection portion and the first connection portion of the heat transfer body The end portion on the side is fixed by a fastener, and the end portion on the first connection portion side of the heat transfer body is provided with a cap nut portion integrally formed by drawing. the first connecting portion when a cooling device for connecting conductors that are fastened to the cap nut portion by bolts A second connection conductor having a second connection portion derived from the second electric device and connected to the first connection portion of the first connection conductor, wherein the first electric device is switched It is made of a semiconductor element, and the second electric device is made of a capacitor.

According to the cooling device for a connection conductor according to the present invention, heat transmitted from the electrical device to the connection conductor such as a bus bar, and in addition to this, heat generated in the connection conductor itself is transmitted from the first connection portion to the heat transfer body and the electrical conductor. It is transmitted to the cooler through the heat transfer material through the insulating heat transfer material and cooled by the cooler, so that it can be efficiently cooled, and the length of the connecting conductor and the heat transfer path are shortened. Thus, the cooling efficiency can be improved and the size can be reduced. Since the first connecting portion is fastened by a bolt to the cap nut portion that is provided at the end portion of the heat transfer body that transfers the heat of the first connecting portion to the cooler and is integrally formed by drawing. As a result, the number of parts can be reduced to facilitate assembly, and workability can be improved and the cost can be reduced.
Moreover, according to the power converter using the cooling device for a connection conductor according to the present invention, heat generated from the switching semiconductor element and transmitted to the first connection conductor and heat generated by the first connection conductor itself are generated. Since it is transmitted by solid heat conduction from the first connecting portion to the cooler via the heat transfer body and the electrically insulating heat transfer material and cooled by the cooler, the generated heat can be efficiently cooled. In addition, since the length of each connection conductor and the heat transfer path can be easily shortened, it is easy to improve the cooling characteristics, reduce the size, and improve the electrical characteristics such as the equivalent series inductance. And about the cooling device of a connection conductor, in the end part in the heat exchanger which transmits the heat | fever of a 1st connection part to a cooler, the 1st connection part is bolted to the bag nut part integrally formed by drawing. Since it is fastened, the number of parts can be reduced and the assembly can be facilitated, and the workability can be improved and the cost can be reduced.

Claims (10)

  A first connection conductor derived from the first electrical device and having a first connection portion, a cooler, and heat of the first connection conductor provided between the cooler and the first connection portion A heat transfer body that conveys heat to the cooler, and an electrically insulating transfer interposed between the heat transfer body and the cooler or between the heat transfer body and the first connection conductor. A cooling device for a connection conductor, comprising: a heat material.   2. The cooling device for a connection conductor according to claim 1, wherein the electrically insulating heat transfer material uses a resin film having an electrically insulating property and grease having a thermally conductive property.   The heat transfer body is characterized in that an elastically deformable portion capable of absorbing a change in dimensions is formed between an end portion on the first connection portion side and an end portion on the cooler side. The connection conductor cooling device according to claim 1 or 2.   The said 1st connection part and the edge part by the side of the said 1st connection part in the said heat exchanger are being fixed with the fastener, The Claim 1 characterized by the above-mentioned. Connection conductor cooling device.   A cap nut portion integrally formed by drawing is provided at an end portion of the heat transfer body on the first connecting portion side, and the first connecting portion is fastened to the cap nut portion by a bolt. The cooling device for a connection conductor according to claim 4.   The cooling device for a connection conductor according to any one of claims 1 to 3, wherein the heat transfer body and the first connection conductor are integrally formed.   A connection fixing part for fixing the first connection part is provided with a terminal block provided on an upper surface part, and the terminal block uses the back surface part to connect the end of the heat transfer body on the cooler side with the electric terminal. The connecting conductor cooling device according to any one of claims 1 to 6, wherein the cooling device is fixed to the cooler so as to be in close contact with the cooler via an insulating heat transfer material.   The heat transfer body is formed in a U shape so as to surround three sides of the upper surface portion, one side surface portion, and the rear surface portion of the connection fixing portion of the terminal block. Connection conductor cooling device.   2. A second connecting conductor having a second connecting portion derived from a second electrical device and connected to the first connecting portion of the first connecting conductor. The cooling device for a connection conductor according to claim 8.   A first connection conductor derived from the first electrical device and having a first connection portion, a cooler, and heat of the first connection conductor provided between the cooler and the first connection portion A heat transfer body that conveys heat to the cooler, and an electrically insulating transfer interposed between the heat transfer body and the cooler or between the heat transfer body and the first connection conductor. And a second conductor having a second connecting portion led out from the second electrical device and connected to the first connecting portion of the first connecting conductor. A power converter comprising a connection conductor, wherein the first electric device is made of a switching semiconductor element, and the second electric device is made of a capacitor.

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