JP2010093060A - Capacitor single element, capacitor module, and power converting device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor single element capable of suppressing propagation of vibration, to provide a capacitor module, and to provide a power converting device using the same. <P>SOLUTION: The capacitor single element 3 includes a metallized film 31 formed by laminating a positive electrode layer 311 and a negative electrode layer 312 in a mutually shifting state through an insulative portion 313, a positive electrode-side electrode portion 321 electrically connected to a positive-electrode power source and coming into contact with the positive electrode layer 311 at one of axial ends 310 as both ends of the metallized film 31 in a winding-axis direction, a negative electrode-side electrode portion 322 electrically connected to a negative-electrode power source and coming into contact with the negative electrode layer 312 at the other axial ends 310, and a shaft core 33 arranged at the gravity center position G of the metallized film 31 in a cross section orthogonal to the winding shaft direction of the metallized film 31. The shaft core 33 is a fixing means for fixing the capacitor single element 3 to a predetermined position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a capacitor single element, a capacitor module, and a power conversion device using the same.

Conventionally, as a component of a power conversion device such as an inverter used in a hybrid vehicle or an electric vehicle, a capacitor single element formed by winding a metallized film and a case for accommodating the capacitor single element inside are provided. A capacitor module is known in which a molding material made of resin is filled between the capacitor single element and the case (see, for example, Patent Document 1).
The metallized film is formed by laminating a positive electrode layer for charging a positive charge and a negative electrode layer for charging a negative charge through an insulating part having electrical insulation.

JP 2006-196678 A

  However, the conventional capacitor module has the following problems. That is, the capacitor single element is fixed in the case covered with the molding material in the case as described above. When a voltage is applied to the single capacitor element, the adjacent positive electrode layer and negative electrode layer are attracted to each other by the Coulomb force generated between the positive charge charged in the positive electrode layer and the negative charge charged in the negative electrode layer. Therefore, vibrations occur in the metallized film of a single capacitor element due to voltage fluctuations that occur in the power conversion circuit. And this vibration propagated to the said case etc. via the said mold material with which the circumference | surroundings of the metallized film were filled, and was finally transmitted to a vehicle as a vibration sound.

On the other hand, although it is conceivable to prevent the vibration in the metallized film itself, it is not feasible and it is difficult to completely prevent the vibration from propagating to the vehicle.
Therefore, a capacitor single element that can suppress propagation of vibration, a capacitor module, and a power conversion device using the same have been desired.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a capacitor single element, a capacitor module, and a power conversion device using the same that can suppress propagation of vibration. .

The first invention is a metallized film obtained by laminating a positive electrode layer for charging a positive charge and a negative electrode layer for charging a negative charge through an insulating part having electrical insulation,
A positive electrode part that is electrically connected to a positive electrode power source disposed outside and is in contact with the positive electrode layer at one of axial end portions that are both ends in the winding axis direction of the metallized film;
A negative electrode side electrode portion that is electrically connected to a negative electrode power source disposed outside and is in contact with the negative electrode layer at the other axial end portion;
An axial center arranged at the center of gravity of the metallized film in a cross section in a direction perpendicular to the winding axis direction of the metallized film;
The single-capacitor element characterized in that the shaft core is a fixing means for fixing the single-capacitor element at a predetermined position.
(Claim 1).

The function and effect of the present invention will be described.
The shaft core is arranged at the center of gravity of the metallized film in a cross section in a direction orthogonal to the winding axis direction of the metallized film, and is a fixing means for fixing the capacitor single element at a predetermined position. is there. Thereby, the capacitor | condenser single element which can suppress the propagation of the vibration in a metallized film can be obtained.

  That is, when a voltage is applied to a single capacitor element, a positive charge is charged on the positive electrode layer in the metallized film, and a negative charge is charged on the negative electrode layer. The adjacent positive electrode layer and negative electrode layer attract each other by the Coulomb force generated between the positive charge charged in the positive electrode layer and the negative charge charged in the negative electrode layer. Therefore, the metallized film vibrates due to voltage fluctuations generated in the power conversion circuit.

  Here, in the present invention, the axis is disposed at the center of gravity of the metallized film that is the source of vibration, that is, the center of gravity as the center of vibration. For this reason, vibrations generated on both sides of the center of gravity position can be sufficiently canceled out in the shaft core. Thus, if the shaft core is disposed at the position of the center of gravity, it is possible to sufficiently suppress the shaft core from vibrating due to the vibration of the metallized film.

Further, in the present invention, the shaft core is used as a fixing means for fixing the capacitor single element at a predetermined position. In this way, by using the shaft core that hardly vibrates as the fixing means, the counterpart side that fixes the shaft core hardly vibrates. Further, by using the shaft core as the fixing means, unlike the conventional case, it is not necessary to fill the space between the metallized film and the case housing the capacitor single element with a molding material made of resin, for example. For this reason, the malfunction that a vibration propagates to a vehicle etc. using a mold material etc. as a medium cannot occur.
As a result, a capacitor single element that can suppress propagation of vibration can be obtained.

  As described above, according to the present invention, it is possible to provide a single capacitor element that can suppress propagation of vibration.

According to a second aspect of the present invention, there is provided a capacitor module including at least one capacitor single element according to the first aspect of the present invention (invention 7).
In the case of the present invention, as described in the first invention, by incorporating a single capacitor element that can suppress the propagation of vibration, it is possible to suppress the propagation of vibration to the outside as a whole capacitor module. it can.

According to a third aspect of the present invention, there is provided a power conversion device comprising a power conversion circuit and the capacitor module according to the second aspect of the present invention (claim 10).
In the case of the present invention, as described in the second invention, by incorporating a capacitor module capable of suppressing the propagation of vibrations, it is possible to suppress the propagation of vibrations to the outside as the entire power converter. it can.

  In the first to third aspects of the invention, the metallized film constituting the capacitor single element includes, for example, the positive electrode layer formed by vapor-depositing a metal layer on the surface of a resin film (dielectric) as the insulating portion, and the above A layer in which the negative electrode layer and the negative electrode layer are overlapped with each other can be used.

Examples of the resin film that is the insulating portion include a resin film made of polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and the like. .
Examples of the metal of the positive electrode layer and the negative electrode layer include aluminum, zinc, and alloys thereof.

In the first invention, it is preferable that the shaft core is disposed so as to protrude in the winding axis direction from the positive electrode side electrode portion and the negative electrode side electrode portion.
In this case, the capacitor single element can be easily fixed at a predetermined position by fixing the shaft core in the portion protruding from the positive electrode shaft portion and the negative electrode shaft portion.

The shaft core includes a positive electrode shaft portion electrically connected to the positive electrode side electrode portion and a negative electrode shaft portion electrically connected to the negative electrode side electrode portion, and the positive electrode shaft portion and the negative electrode The shaft portion is preferably electrically insulated from each other (claim 3).
In this case, the shaft core can also be used as an electrode member by connecting the positive shaft portion and the negative shaft portion to the positive power source and the negative power source, respectively. For this reason, the number of parts of the capacitor module incorporating the capacitor single element can be reduced.

Moreover, it is preferable that the said shaft core consists of one rod-shaped body (Claim 4).
In this case, an axial core having sufficient strength can be obtained as a support member for fixing the capacitor single element at a predetermined position.

Further, the shaft core is disposed so as to protrude in the winding axis direction from the positive electrode side electrode portion and the negative electrode side electrode portion, and any one of the end portions of the shaft core in the winding axis direction. One may be configured to be covered with the positive electrode portion or the negative electrode portion (Claim 5).
In this case, since the currents flowing through the positive electrode portion and the negative electrode portion are close to each other and face each other, the inductance of the single capacitor element can be reduced.

The shaft core is preferably electrically insulated from at least one of the positive electrode portion and the negative electrode portion.
In this case, since the shaft core has no electric potential, it is not necessary to consider the electrical insulation of the mating side that fixes the shaft core.

In the second invention, the single capacitor element may be fixed at a predetermined position only through the shaft core.
In this case, the capacitor single element can be fixed at a predetermined position only through the shaft core without filling with a molding material or the like. For this reason, the propagation of vibration can be reliably prevented as the entire capacitor module.

The shaft core may be fixed to at least one of a positive bus bar electrically connected to the positive power source and a negative bus bar electrically connected to the negative power source. (Claim 9).
Also in this case, the capacitor single element can be easily fixed without filling with a molding material or the like.

Example 1
Embodiments relating to a single capacitor element, a capacitor module, and a power conversion device using the same according to the present invention will be described with reference to FIGS.
The capacitor single element of this example includes a metallized film 31, a positive electrode side electrode part 321, a negative electrode side electrode part 322, and a shaft core 33 as shown in FIGS. 1 to 3.

The metallized film 31 is formed by laminating a positive electrode layer 311 that charges a positive charge and a negative electrode layer 312 that charges a negative charge in a state of being shifted from each other via an insulating portion 313 having electrical insulation.
The positive electrode portion 321 is electrically connected to a positive power source disposed outside, and contacts the positive electrode layer 311 at one of axial end portions 310 that are both ends in the winding axis direction of the metallized film 31. To do.

The negative electrode portion 322 is electrically connected to a negative power source disposed outside, and contacts the negative electrode layer 312 at the other axial end 310.
The shaft core 33 is disposed at the center of gravity G of the metallized film 31 in a cross section in a direction orthogonal to the winding axis direction of the metallized film 31.

Further, the shaft core 33 is used as a fixing means for fixing the capacitor single element 3 at a predetermined position. In this example, the capacitor single element 3 is fixed at a predetermined position only through the shaft core 33 as will be described later.
Specifically, in this example, as shown in FIGS. 1, 2, and 5, the shaft core 33 is disposed so as to protrude in the winding axis direction from the positive electrode portion 321 and the negative electrode portion 322. Has been. And the capacitor | condenser single element 3 is being fixed to the predetermined position by fixing the axial core 33 only to the bus bar 4. FIG. At this time, the shaft core 33 and the bus bar 4 can be connected by welding or the like, for example.

  In the present invention, the capacitor single element 3 is fixed at a predetermined position by connecting the shaft core 33 to the positive electrode bus bar 41 and the negative electrode bus bar 42, but the positive electrode part 321 and the positive electrode bus bar 41, And when the negative electrode side electrode part 322 and the negative electrode side bus bar 42 are connected, it is also possible to fix only the shaft core 33 to the case 20 or the like.

  In addition, for example, when the shaft core 33 is not protruded from the positive electrode side electrode part 321 or the negative electrode side electrode part 322, the shaft core 33 disposed at a position deeper than the positive electrode side electrode part 321 or the negative electrode side electrode part 322 A bus bar 4 can also be connected.

Below, the said capacitor | condenser single element 3, the capacitor | condenser module 2 incorporating this, and the power converter device 1 using the same are demonstrated in detail.
The capacitor single element 3 is built in the capacitor module 2 as shown in FIG.
And this capacitor | condenser module 2 is integrated in the power converter device 1 which comprises a power converter circuit.

The power conversion device 1 is mounted on, for example, an electric vehicle, a hybrid vehicle, a fuel cell vehicle, and the like.
Moreover, the power converter device 1 has the battery 10, the capacitor | condenser module 2, the DC-DC converter 11, the inverter 12, the switching element 13, and the motor generator 14, as shown in FIG.

The inverter 12 receives the power supply potential smoothed by the capacitor module 2, for example, and drives the three-phase AC motor generator 14.
Further, the inverter 12 returns the electric power generated in the motor generator 14 due to regenerative braking to the battery 10.
Further, the inverter 12 has a plurality of switching elements 13.

The DC-DC converter 13 includes a plurality of switching elements 13 and a reactor 111 for boosting the input voltage.
The battery 10 can be, for example, a secondary battery such as nickel metal hydride or lithium ion.

As shown in FIG. 6, the capacitor module 2 is incorporated in the power conversion device 1 constituting the power conversion circuit as a smoothing capacitor that uses the intermittent current input to the inverter 12 as a smooth direct current.
The capacitor module 2 of this example has a case 20 for housing one or more capacitor single elements 3 inside.

The case 20 in the capacitor module 2 can be, for example, a resin case made of PPS or a metal case made of aluminum or iron. In the present invention, the case 20 is formed using a resin made of PPS.
Moreover, between the case 20 and the capacitor | condenser single element 3 in the capacitor | condenser module 2, it is not filled with the molding material etc. which consist of epoxy resins, for example, and only air exists.
Further, the case 20 in the capacitor module 2 can be a part of the power conversion device 1.

  In this example, as shown in FIG. 5, in the case 20 of the capacitor module 2, the capacitor single element 3 is arranged with its axis 33 parallel to the bottom surface 200 of the case 20. However, the arrangement method of the capacitor single element 3 of the present invention is not limited to this, and the shaft core 33 can be arranged in the case 20 so as to be orthogonal to the bottom surface 200 of the case 20. .

Next, the capacitor single element 3 will be described in detail.
A plurality of capacitor single elements 3 are connected inside the case 20 of the capacitor module 2.

In addition, as shown in FIGS. 1A and 3, the capacitor single element 3 includes a positive electrode layer 311 and a negative electrode layer 312 formed by vapor-depositing a metal layer on an insulating portion 313 (resin film) serving as a base. The metallized film 31 laminated and integrally formed in a shifted state is wound into a spiral shape.
Unlike the above, the capacitor single element 3 can be formed by winding a plurality of metallized films 31 a plurality of times.

Further, the metallicon metal is sprayed on both of the axial end portions 310 in the winding axis direction of the metallized film 31, and the metallicon metal is applied to the positive electrode side electrode portion 321 and the negative electrode side electrode portion 322 in the capacitor single element 2. It is.
As this metallicon metal, for example, aluminum, zinc, and alloys thereof can be used.

  Further, the positive electrode layer 311 and the negative electrode layer 312 in the metallized film 31 are insulated by an insulating portion 313 as shown in FIG. When the metallized film 31 is wound, the positive electrode layer 311 and the negative electrode layer 312 are alternately arranged in a state of being shifted from each other via the insulating portion 313 that is a dielectric.

  Examples of the resin film that is the insulating portion 313 include a resin film made of polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and the like.

Further, the shaft cores 33 of the capacitor single elements 3 arranged in parallel are in contact with each other at the tip 330 as shown in FIG.
Further, as described above, the capacitor single element 3 is fixed to the bus bar 4 at the shaft core 33 and disposed at a predetermined position.

Specifically, as shown in FIG. 1A, the shaft core 33 includes a positive shaft portion 331 that is electrically connected to the positive power source and a negative shaft portion 332 that is electrically connected to the negative power source. And consists of two members.
The positive electrode shaft portion 331 and the negative electrode side shaft portion 332 are electrically insulated from each other.

The positive electrode shaft portion 331 is fixed by the positive electrode bus bar 41, and the negative electrode shaft portion 332 is fixed by the negative electrode bus bar 42.
As described above, only air is interposed between the case 20 and the single capacitor element 3, and the single capacitor element 3 is not in contact with other members other than the bus bar 4.

  With the above configuration, as shown in FIG. 5, a positive charge flows from the positive electrode shaft portion 331 electrically connected to the positive electrode side bus bar 41 to the positive electrode layer 311 through the positive electrode side electrode portion 321. . On the other hand, negative charges flow from the negative electrode shaft portion 332 electrically connected to the negative electrode side bus bar 42 to the negative electrode layer 312 via the negative electrode side electrode portion 322.

In addition, the capacitor | condenser single element 3 can be made into a substantially cylindrical shape as shown in FIG.1 (b), FIG.2, FIG.3.
Moreover, in the capacitor | condenser single element 3 of this example, after winding the metallized film 31, the axial core 33 may be inserted in the gravity center position G of the metallized film 31, and the axial core 33 is the gravity center position G, for example. The metallized film 31 may be wound around the shaft core 33 so as to be disposed on the surface.
Further, even if the shaft core 33 is bent, the effect of the present invention can be sufficiently obtained as long as it is always disposed at the center of gravity G of the metallized film 31.

Below, the effect of this invention is demonstrated.
The shaft core 33 is disposed at the center of gravity G of the metallized film 31 in a cross section in a direction orthogonal to the winding axis direction of the metallized film 31, and a fixing means for fixing the capacitor single element 3 to a predetermined position. It is. Thereby, the capacitor | condenser single element 3 which can suppress propagation of the vibration in the metallized film 31 can be obtained.

  That is, when a voltage is applied to the single capacitor element 3, a positive charge is charged on the positive electrode layer 311 in the metallized film 31 and a negative charge is charged on the negative electrode layer 312. The adjacent positive electrode layer 311 and negative electrode layer 312 attract each other by the Coulomb force generated between the positive charge charged in the positive electrode layer 311 and the negative charge charged in the negative electrode layer 312. Therefore, vibration is generated in the metallized film 31 due to voltage fluctuations generated in the power conversion circuit.

  Here, in this example, the shaft core 33 is disposed at the center of gravity position G of the metallized film 31 serving as a vibration generation source, that is, the center of gravity position G as the center of vibration. For this reason, vibrations generated on both sides of the gravity center position G can be sufficiently canceled out at the gravity center position G, that is, the shaft core 33. As described above, if the shaft core 33 is arranged at the gravity center position G, it is possible to sufficiently suppress the shaft core 33 from vibrating due to the vibration of the metallized film 31.

Further, in this example, the shaft core 33 is used as a fixing means for fixing the single capacitor element 3 at a predetermined position. In this way, by using the shaft core 33 that hardly vibrates as the fixing means, the counterpart side that fixes the shaft core 33, that is, the bus bar 4, hardly vibrates. Furthermore, by using the shaft core 33 as a fixing means, unlike the conventional case, it is not necessary to fill the space between the metallized film 31 and the case 20 with, for example, a molding material made of resin. For this reason, the malfunction that a vibration propagates to a vehicle etc. using a mold material etc. as a medium cannot occur.
As a result, the capacitor single element 3 that can suppress the propagation of vibration can be obtained.

  Further, the shaft core 33 is disposed so as to protrude in the winding axis direction from the positive electrode portion 321 and the negative electrode portion 322. For this reason, the capacitor | condenser single element 3 can be easily fixed to a predetermined position by fixing the axial core 33 of the part protruded rather than the axial direction edge part 310. FIG.

  The shaft core 33 includes two members, a positive shaft portion 331 that is electrically connected to the positive power source and a negative shaft portion 332 that is electrically connected to the negative power source. Since the positive electrode shaft portion 331 is connected to the positive electrode side electrode portion 321 and the negative electrode shaft portion 332 is connected to the negative electrode side electrode portion 322, the shaft core 33 can also be used as an electrode member. For this reason, the number of parts of the capacitor module 2 incorporating the capacitor single element 3 can be reduced.

  Moreover, since the power converter device 1 includes the capacitor module 2 including the capacitor single element 3, the power converter device 1 as a whole can suppress vibration propagation.

  As described above, according to this example, it is possible to provide a capacitor single element and a capacitor module that can suppress propagation of vibration, and a power converter using the same.

(Example 2)
This example is an example of the capacitor single element 3 in which the shaft core 33 is formed of a single rod-shaped body as shown in FIG.
In the present invention, between the negative electrode side electrode portion 322 and the shaft core 33, an insulator 34 made of, for example, the above-described resin or ceramic such as PET or PP is disposed. Yes.
Other configurations are the same as those of the first embodiment.

In this example, since the shaft core 33 is formed of a single rod-shaped body, the shaft core 33 having sufficient strength can be obtained as a support member for fixing the capacitor single element 3 at a predetermined position.
The other functions and effects are the same as those of the first embodiment.

  The insulator 34 can be disposed not only between the negative electrode portion 322 and the shaft core 33 but also between the positive electrode portion 321 and the shaft core 33. In such a case, it is necessary to bring the positive electrode side electrode part 321 and the positive electrode side bus bar 41 into contact with each other and to bring the negative electrode side electrode part 322 and the negative electrode side bus bar 42 into contact with each other.

(Example 3)
This example is an example of the capacitor single element 3 in which one of the axial cores 33 in the winding axis direction is covered with the positive electrode portion 321 as shown in FIG.
Specifically, the shaft core 33 protrudes in the winding axis direction from the positive electrode portion 321 and the negative electrode portion 322. The shaft core 33 related to the portion protruding from the positive electrode portion 321 is covered with the positive electrode portion 321.
In this example, an insulator 34 is disposed between the positive electrode portion 321 and the shaft core 33.
Other configurations are the same as those of the first embodiment.

In the case of this example, the shaft core 33 is disposed so as to protrude in the winding axis direction from the axial end portion 310, and one of the end portions of the shaft core 33 in the winding shaft direction is the positive electrode side. The electrode portion 321 is covered. Thereby, the inductance of the capacitor single element 3 can be reduced.
The other functions and effects are the same as those of the first embodiment.

Example 4
As shown in FIG. 9, the present example is an example in which vibrations in the winding axis direction of the metallized film are compared between the product of the present invention and the conventional product.
That is, the capacitor module shown in Example 1 was prepared as the product of the present invention.
As a conventional product, a capacitor module was prepared in which the periphery of a capacitor single element was filled with a molding material.

Then, it was investigated how much vibration was detected when a vibration of 10 kHz was applied to the product of the present invention and the conventional product in the winding axis direction of the single capacitor element.
In this example, acceleration (actually measured by vibration) was converted to dB when acceleration 1G was set to 0 dB, and a value (dBG / A) divided by a current value (ampere) passed through a single capacitor element was calculated.

The measurement results are shown in FIG.
As can be seen from the figure, in the product of the present invention, vibration can be sufficiently suppressed as compared with -59 dBG / A and -23 dBG / A in the conventional product.
As can be seen from the above, according to the present invention, since vibration is hardly transmitted to the shaft core, vibration in the metallized film can be sufficiently suppressed.

(A) The longitudinal cross-sectional view of a capacitor | condenser single element in Example 1, (b) The AA sectional view taken on the line in (a). 1 is a perspective view of a capacitor single element in Example 1. FIG. The perspective view of the metallized film in Example 1. FIG. FIG. 3 is an explanatory diagram showing the Coulomb force in the metallized film in Example 1. 1 is a longitudinal sectional view of a capacitor module in Example 1. FIG. The circuit diagram of the power converter device in Example 1. FIG. FIG. 6 is a longitudinal sectional view of a capacitor single element in Example 2. (A) The longitudinal cross-sectional view of a capacitor | condenser single element in Example 3, (b) The BB sectional view taken on the line in (a). The plot figure which compared the vibration in Example 4 in this invention, and the conventional product.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power converter device 2 Capacitor module 3 Capacitor single element 31 Metallized film 310 Axial direction end part 311 Positive electrode layer 312 Negative electrode layer 313 Insulation part 321 Positive electrode side electrode part 322 Negative electrode side electrode part 33 Axis core G Center of gravity position

Claims (10)

A metallized film obtained by laminating a positive electrode layer for charging a positive charge and a negative electrode layer for charging a negative charge through an insulating part having electrical insulation;
A positive electrode part that is electrically connected to a positive electrode power source disposed outside and is in contact with the positive electrode layer at one of axial end portions that are both ends in the winding axis direction of the metallized film;
A negative electrode side electrode portion that is electrically connected to a negative electrode power source disposed outside and is in contact with the negative electrode layer at the other axial end portion;
An axial center arranged at the center of gravity of the metallized film in a cross section in a direction perpendicular to the winding axis direction of the metallized film;
The single-capacitor element characterized in that the shaft core is a fixing means for fixing the single-capacitor element at a predetermined position.   2. The capacitor single element according to claim 1, wherein the shaft core is disposed so as to protrude in the winding axis direction from the positive electrode portion and the negative electrode portion.   3. The positive electrode shaft according to claim 1, wherein the shaft core includes a positive electrode shaft portion electrically connected to the positive electrode side electrode portion and a negative electrode shaft portion electrically connected to the negative electrode side electrode portion. The capacitor single element, wherein the shaft portion and the negative electrode shaft portion are electrically insulated from each other.   3. The capacitor single element according to claim 1, wherein the shaft core is made of a single rod-shaped body.   5. The shaft core according to claim 1, wherein the shaft core is disposed so as to protrude in the winding axis direction from the positive electrode portion and the negative electrode portion, and the winding axis direction. Any one of the end portions of the shaft core is covered with the positive electrode side electrode portion or the negative electrode side electrode portion.   6. The capacitor single element according to claim 1, wherein the shaft core is electrically insulated from at least one of the positive electrode portion and the negative electrode portion.   A capacitor module comprising at least one capacitor single element according to claim 1.   8. The capacitor module according to claim 7, wherein the single capacitor element is fixed at a predetermined position only through the shaft core.   9. The shaft core according to claim 7, wherein the shaft core is fixed to at least one of a positive electrode bus bar electrically connected to the positive electrode power source and a negative electrode bus bar electrically connected to the negative electrode power source. Capacitor module characterized by   A power conversion device comprising a power conversion circuit and the capacitor module according to claim 7.

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