JP2018037487A - Bus bar structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar structure capable of reducing a distance of both bus bars.SOLUTION: A bus bar structure comprises a P bus bar (2), an N bus bar (3), and an insulator (4) arranged between the P bus bar (2) and the N bus bar (3). The P bus bar (2) includes a P bus bar main body (2a) opposite to the insulator (4), and a P bus bar folding part (2b) that is folded in one end part of the P bus bar main body (2a). The N bus bar (3) includes a N bus bar main body (3a) opposite to the insulator (4), and an N bus bar folding part (3b) that is folded in one end part of the N bus bar main body (3a). The P bus bar folding part (2b) and the N bus bar folding part (3b) are folded to a direction far from the insulator (4).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bus bar structure.

  In the bus bar structure disclosed in Patent Document 1, two bus bars are arranged with a distance L in the normal direction to the respective plate surfaces.

JP2012-010426A

  When the distance between the bus bars is shortened, the bus bar structure and the device having the bus bar structure can be reduced in size, which is preferable.

  There is also a need for a bus bar structure that includes an end portion of a bus bar having high mechanical strength. Therefore, the inventors have recalled that the end of the bus bar is hemmed. However, with this recalled bus bar structure, a problem has been found that the distance between the bus bars cannot be shortened according to the accuracy of hemming.

  This problem will be described using the power converter 90 shown in FIG. The power converter 90 includes a capacitor module 91, a P bus bar 92, an N bus bar 93, and an insulating resin plate 94. The P bus bar 92 and the N bus bar 93 constitute a bus bar structure. Each of the P bus bar 92 and the N bus bar 93 includes a plate-like P bus bar main body 92 a and an N bus bar main body 93 a extending from the capacitor module 91. The P bus bar main body 92a and the N bus bar main body 93a sandwich an insulating resin plate 94 therebetween. The P bus bar 92 includes a P bus bar folded portion 92b that is hemmed at one end of the P bus bar main body 92a. Specifically, the P bus bar folded portion 92b is folded toward the insulating resin plate 94 side.

  Since the P bus bar folded portion 92b is folded toward the insulating resin plate 94, the distance L9 between the P bus bar 92 and the N bus bar 93 is the thickness of the P bus bar 92, specifically, the thickness of the P bus bar folded portion 92b. Will be included. Further, depending on the accuracy of the hemming process, the P bus bar folded part 92b, which is the hemmed part, or the vicinity thereof may rise, and the thickness of the P bus bar folded part 92b may increase. As a result, the distance L9 between the P bus bar 92 and the N bus bar 93 may not be shortened.

  The bus bar structure according to the present invention is intended to shorten the distance between the bus bars.

The bus bar structure according to the present invention is:
P bus bar,
N bus bar,
An insulator disposed between the P bus bar and the N bus bar,
The P bus bar includes a P bus bar main body facing the insulator, and a P bus bar folded portion folded at one end of the P bus bar main body,
The N bus bar includes an N bus bar main body facing the insulator, and an N bus bar folded portion folded at one end of the N bus bar main body,
The P bus bar folded portion and the N bus bar folded portion are folded in a direction away from the insulator.
According to such a configuration, the distance between the P bus bar and the N bus bar can be determined according to only the thickness of the insulator without depending on the thickness of the bus bar. Since the P bus bar folded portion and the N bus bar folded portion are folded away from the insulator, even if the thickness of the P bus bar folded portion and the N bus bar folded portion is increased due to hemming or the like, the P bus bar and the N bus bar folded portion are formed. Does not affect the distance. Therefore, the distance between the bus bars can be shortened.

  The bus bar structure according to the present invention can shorten the distance between the bus bars.

1 is a perspective view of a power conversion device according to a first embodiment. 1 is a cross-sectional view schematically showing a power conversion device according to a first embodiment. It is sectional drawing which shows a related power converter device typically.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

(Embodiment 1)
The embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view of a power converter according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view schematically showing the power conversion device according to the first embodiment. 1 and 2, an xyz three-dimensional orthogonal coordinate system is defined.

  As shown in FIGS. 1 and 2, the power conversion device 10 includes a capacitor module 1, a P bus bar 2, an N bus bar 3, and an insulating resin sheet 4. The cross section of the capacitor module 1 shown in FIG. 2 is simplified. The power conversion device 10 includes a bus bar structure, and the bus bar structure includes a P bus bar 2 and an N bus bar 3.

  When the capacitor module 1 receives DC power, it generates AC power electrically. The capacitor module 1 includes, for example, a capacitor element.

  The P bus bar 2 includes a P bus bar body 2a and a P bus bar folded portion 2b folded at one end of the P bus bar body 2a. An example of an angle formed by the intersection of the main surface of the P bus bar folded portion 2b and the main surface of the P bus bar main body 2a is 180 °. For example, the end portion of the P bus bar 2 can be hemmed to form the P bus bar folded portion 2b. The P bus bar main body 2 a faces the insulating resin sheet 4. The P bus bar 2 is connected to the capacitor module 1 so that electricity can be transferred. The P bus bar 2 is made of, for example, pure copper, but may be made of a metal material having high conductivity such as aluminum, copper, or an alloy mainly composed of aluminum.

  N bus bar 3 includes an N bus bar main body 3a and an N bus bar folded portion 3b which is folded at one end of N bus bar main body 3a. An example of an angle formed by the intersection of the main surface of the N bus bar folded portion 3b and the main surface of the N bus bar main body 3a is 180 °. For example, the N bus bar folded portion 3b can be formed by hemming the end portion of the N bus bar 3. The N bus bar 3 is arranged with a distance L1 from the P bus bar 2. The N bus bar body 3 a faces the insulating resin sheet 4. The N bus bar 3 is connected to the capacitor module 1 so that electricity can be transferred. The N bus bar 3 is made of, for example, pure copper, but may be configured using a metal material having high conductivity such as aluminum, copper, or an alloy containing these as a main component.

  The insulating resin sheet 4 is a sheet material made of a resin material having a property of insulating electricity or a material mainly composed of this resin material. The insulating resin sheet 4 can be formed using a prepreg material, for example. A specific example of the prepreg material can be formed by impregnating glass cloth or the like in an epoxy resin to which a filler is added and semi-curing the epoxy resin. The insulating resin sheet 4 is disposed between the P bus bar 2 and the N bus bar 3.

  As described above, according to the power conversion device 10, the P bus bar folded portion 2 b and the N bus bar folded portion 3 b are both folded in the direction away from the insulating resin sheet 4. Therefore, between the P bus bar 2 and the N bus bar 3, the thickness of the P bus bar 2, in particular, the P bus bar folded portion 2b is not included. Therefore, the distance L1 between the P bus bar 2 and the N bus bar 3 tends to be smaller than the distance L9 between the P bus bar 92 and the N bus bar 93. The distance between the P bus bar and the N bus bar is determined according to only the thickness of the insulating resin sheet 4 without depending on the thickness of the P bus bar 2, in particular, the P bus bar folded portion 2b.

  Moreover, the P bus bar folding | turning part 2b is located in the surface on the opposite side to the insulating resin sheet 4 side in the P bus bar main body 2a instead of the insulating resin sheet 4 side in the P bus bar main body 2a. Moreover, the N bus bar folding | turning part 3b is located in the surface on the opposite side to the insulating resin sheet 4 side in the N bus bar main body 3a instead of the insulating resin sheet 4 side in the N bus bar main body 3a. Between the P bus bar 2 and the N bus bar 3, the P bus bar folding part 2b and the N bus bar folding part 3b are not included. Even if the thickness of the N bus bar folded portion 3b is increased from that of the N bus bar main body 3a by hemming or the like, the distance between the P bus bar 2 and the N bus bar 3 is not affected. Therefore, the distance between the P bus bar 2 and the N bus bar 3 can be shortened.

  Here, the inductance can be reduced by shortening the distance between the P bus bar 2 and the N bus bar 3. Specifically, the equivalent series inductance due to the mutual inductance generated between the P bus bar 2 and the N bus bar 3 can be reduced. Further, by reducing the inductance, a surge voltage that can be generated during operation of an element that can be included in the power conversion device 10 can be suppressed. Further, by suppressing the surge voltage, it is possible to reduce the size of a configuration that can be included in the power conversion device 10, for example, an element and a control board.

  The power conversion device 10 may be used as one configuration of a PCU (power control unit) mounted on a moving body such as a four-wheeled vehicle. By reducing the size of the power converter 10, it is possible to reduce the size of the PCU.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the power conversion device 10 according to Embodiment 1 includes the insulating resin sheet 4, but may include an insulator instead. The insulator may have a property of electrically insulating the P bus bar 2 and the N bus bar 3.

2 P bus bar 2a P bus bar body 2b P bus bar folding part 3 N bus bar 3a N bus bar body 3b N bus bar folding part 4 Insulating resin sheet

Claims (1)

P bus bar,
N bus bar,
An insulator disposed between the P bus bar and the N bus bar,
The P bus bar includes a P bus bar main body facing the insulator, and a P bus bar folded portion folded at one end of the P bus bar main body,
The N bus bar includes an N bus bar main body facing the insulator, and an N bus bar folded portion folded at one end of the N bus bar main body,
The P bus bar folded portion and the N bus bar folded portion are folded in a direction away from the insulator,
Bus bar structure.

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