WO2022259899A1

WO2022259899A1 - Film capacitor

Info

Publication number: WO2022259899A1
Application number: PCT/JP2022/022000
Authority: WO
Inventors: 正仁佐野
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2021-06-11
Filing date: 2022-05-30
Publication date: 2022-12-15
Also published as: JPWO2022259899A1; CN117461104A

Abstract

This film capacitor comprises: a dielectric film; a first electrode disposed on a first surface; and a second electrode disposed on a second surface. The film capacitor includes three unit capacitors connected in series in a short side direction S. The first electrode is separated into a first non-segmented electrode and a first segmented electrode. The first segmented electrode is divided into a plurality of first small electrode groups. Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse. The second electrode is separated into a second non-segmented electrode and a second segmented electrode. The second segmented electrode is divided into a plurality of second small electrode groups. Each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse.

Description

Film capacitor

The present disclosure generally relates to film capacitors, and more particularly relates to film capacitors used in electronic equipment, electrical equipment, industrial equipment, automobiles, and the like.

Patent Document 1 discloses a film capacitor. This film capacitor employs a structure in which two capacitors are connected in series.

Specifically, the film capacitor of Patent Document 1 is a film capacitor having a structure in which two films are stacked and wound into a cylindrical shape.

Then, on one side of each of the two films, two common electrodes which are divided into two in the film width direction orthogonal to the winding direction and which are continuous in the winding direction are vapor-deposited.

Also, on the other surface of the one film or one surface of the other film, a partial electrode that is divided into two in the film width direction and divided into a plurality of parts in the winding direction is vapor-deposited.

In addition, among the divided partial electrodes, a plurality of sets of two partial electrodes arranged in the film width direction are connected to each other via a security mechanism positioned between the two partial electrodes for each set.

JP 2014-067793 A

The film capacitor of Patent Document 1 uses a structure in which two capacitors are connected in series to achieve a high withstand voltage.

However, when used at even higher voltages, there was a problem that it became difficult to maintain the function of the film capacitor as a whole.

An object of the present disclosure is to provide a film capacitor that can retain its functionality as a whole even when used at high voltage.

A film capacitor according to an aspect of the present disclosure includes a dielectric film having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction orthogonal to a lateral direction; It comprises a first electrode arranged on one surface and a second electrode arranged on the second surface.

The film capacitor includes three unit capacitors connected in series in the lateral direction by facing the first electrode and the second electrode via the dielectric film.

The first electrode is separated into a first non-split electrode extending in the longitudinal direction and a first split electrode by the first margin portion extending in the longitudinal direction.

The first divided electrodes are divided into a plurality of first small electrode groups aligned in the longitudinal direction by first transverse direction slit portions extending in the transverse direction.

Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse.

The second electrode is separated into a second non-split electrode extending in the longitudinal direction and a second split electrode by the second margin portion extending in the longitudinal direction.

The second divided electrodes are divided into a plurality of second small electrode groups aligned in the longitudinal direction by second transverse direction slit portions extending in the transverse direction.

Each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse.

According to the present disclosure, the function as a whole can be maintained even when used at high voltage.

FIG. 1 is an explanatory diagram showing the film capacitor according to the first embodiment. FIG. 2A is an explanatory diagram showing how the first electrode and the second electrode of the film capacitor according to the first embodiment face each other. FIG. 2B is an explanatory diagram showing how the first electrode and the second electrode of the film capacitor according to the second embodiment face each other. FIG. 3 is an explanatory diagram showing a film capacitor according to the third embodiment. FIG. 4 is an explanatory diagram showing how the first electrode and the second electrode of the film capacitor are opposed to each other. FIG. 5 is a schematic cross-sectional view showing a film capacitor according to a fourth embodiment. FIG. 6 is an explanatory diagram showing the film capacitor of the same. FIG. 7A is a schematic cross-sectional view showing a film capacitor including one unit capacitor in the width direction. FIG. 7B is an explanatory diagram showing the same film capacitor. FIG. 8A is a schematic cross-sectional view showing a film capacitor including two unit capacitors connected in series in the width direction. FIG. 8B is an explanatory diagram showing the same film capacitor. FIG. 9A is a schematic cross-sectional view showing a film capacitor including three unit capacitors connected in series in the width direction. FIG. 9B is an explanatory diagram showing the same film capacitor. FIG. 10 is a schematic perspective view showing an example of a film capacitor.

1. Outline FIG. 10 shows an example of a film capacitor 1 . The film capacitor 1 has, for example, a cylindrical shape. The film capacitor 1 is formed, for example, by stacking and winding two elongated dielectric films 2 (a first dielectric film 21 and a second dielectric film 22).

Here, the first electrode 31 is arranged on one side of the first dielectric film 21 . A second electrode 32 is arranged on one side of the second dielectric film 22 . In the film capacitor 1 , the first electrode 31 and the second electrode 32 face each other with the dielectric film 2 interposed therebetween. Edge electrodes 30 (a first edge electrode 310 and a second edge electrode 320) are formed at both ends of the film capacitor 1 . The first electrode 31 is connected to the first edge electrode 310 . The second electrode 32 is connected to the second edge electrode 320 . By applying a voltage between the first edge electrode 310 and the second edge electrode 320, the film capacitor 1 can be charged.

The film capacitor 1 can include one to three unit capacitors 10 in the lateral direction S (width direction) of the dielectric film 2 (see FIGS. 7A, 8A and 9A). This point will be described below. In addition, one side of the transversal direction S may be called "left side" and the other side may be called "right side."

The film capacitor 1 shown in FIG. 7A includes one unit capacitor 10 in the lateral direction S of the dielectric film 2. In FIG.

As shown in FIG. 7B, a first edge margin portion 241 is arranged on the right edge of one side of the first dielectric film 21 . The first electrode 31 is arranged on the entire one side of the first dielectric film 21 except for the first end margin portion 241 . The first electrode 31 includes the left end portion of one side of the first dielectric film 21 and is connected to the first edge electrode 310 at this portion (see FIG. 7A). The presence of the first edge margin portion 241 separates the first electrode 31 and the second edge electrode 320 from each other.

On the other hand, a second edge margin portion 242 is arranged at the left edge of one side of the second dielectric film 22 . A second electrode 32 is arranged on the entire one side of the second dielectric film 22 excluding the second end margin portion 242 . The second electrode 32 includes the right edge of one side of the second dielectric film 22 and is connected to the second edge electrode 320 at this portion (see FIG. 7A). The presence of the second end margin portion 242 separates the second electrode 32 from the first end face electrode 310 .

Then, as shown in FIG. 7A, one unit capacitor 10 is formed in a portion where the first electrode 31 and the second electrode 32 face each other with the dielectric film 2 (first dielectric film 21) interposed therebetween.

Also, the film capacitor 1 shown in FIG. 8A includes two unit capacitors 10 connected in series in the transverse direction S of the dielectric film 2 .

As shown in FIG. 8B, the first electrode 31 is divided into left and right sides by a first margin portion 211 . The left first electrode 31 includes the left end portion of one side of the first dielectric film 21 and is connected to the first edge electrode 310 at this portion. The right first electrode 31 includes the right end portion of one side of the first dielectric film 21 and is connected to the second edge electrode 320 at this portion (see FIG. 8A).

On the other hand, second edge margin portions 242 are arranged at the left edge and right edge of one side of the second dielectric film 22 . The second electrode 32 is arranged entirely between the second end margin portions 242 on both sides. The presence of the second edge margin portions 242 on both sides separates the second electrode 32 from the first edge electrode 310 and the second edge electrode 320 .

Then, as shown in FIG. 8A, two unit capacitors 10 are formed in the portion where the first electrode 31 and the second electrode 32 face each other with the dielectric film 2 (first dielectric film 21) interposed therebetween. These unit capacitors 10 are connected in series in the lateral direction S. As shown in FIG.

Therefore, when the voltages applied to the film capacitors 1 shown in FIGS. 7A and 8A are the same, the film capacitor 1 shown in FIG. It becomes easier to suppress the damage of

Also, the film capacitor 1 shown in FIG. 9A includes three unit capacitors 10 connected in series in the transverse direction S of the dielectric film 2 .

As shown in FIG. 9B, the first electrode 31 is divided into left and right sides by a first margin portion 211 . The left first electrode 31 includes the left edge of one side of the first dielectric film 21 and is connected to the first edge electrode 310 at this portion (see FIG. 9A). A first edge margin portion 241 is arranged at the right edge of one side of the first dielectric film 21 . The first electrode 31 on the right side is arranged entirely between the first margin portion 211 and the first end margin portion 241 . The presence of the first end margin portion 241 separates the right first electrode 31 and the second end face electrode 320 from each other.

On the other hand, the second electrode 32 is divided into left and right sides by the second margin portion 212 . The right second electrode 32 includes the right edge of one side of the second dielectric film 22 and is connected to the second edge electrode 320 at this portion (see FIG. 9A). A second edge margin portion 242 is arranged at the left edge of one side of the second dielectric film 22 . The left second electrode 32 is disposed entirely between the second end margin portion 242 and the second margin portion 212 . The presence of the second edge margin portion 242 separates the left second electrode 32 from the first edge electrode 310 .

Then, as shown in FIG. 9A, three unit capacitors 10 are formed in portions where the first electrode 31 and the second electrode 32 face each other with the dielectric film 2 (first dielectric film 21) interposed therebetween. These unit capacitors 10 are connected in series in the lateral direction S. As shown in FIG.

Therefore, when the voltage applied to the film capacitors 1 shown in FIGS. 7A, 8A and 9A is the same, the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in FIG. 9A is By making it the smallest, it becomes easier to suppress damage to the dielectric film 2 .

The present inventor further improved the film capacitor 1 shown in FIGS. 9A and 9B to develop the following film capacitor 1.

That is, as shown in FIG. 1, the first electrode 31 is separated into the first undivided electrode 41 and the first divided electrode 51 by the first margin portion 211 . The first divided electrode 51 is divided into a plurality of first small electrode groups 510 by first lateral direction slit portions 221 . Each of the multiple first small electrode groups 510 includes multiple first small electrodes 511 . A plurality of first small electrodes 511 are connected by a first fuse 61 .

On the other hand, the second electrode 32 is separated into the second non-split electrode 42 and the second split electrode 52 by the second margin portion 212 . The second divided electrode 52 is divided into a plurality of second small electrode groups 520 by second lateral direction slit portions 222 . Each of the multiple second small electrode groups 520 includes multiple second small electrodes 521 . A plurality of second small electrodes 521 are connected by a second fuse 62 .

A first unit capacitor 10 is formed in a portion (Z1 portion in FIG. 1) where the first non-split electrode 41 and the second small electrode 521 on the left face each other with the dielectric film 2 interposed therebetween. A second unit capacitor 10 is formed in a portion (Z2 portion in FIG. 1) where the first small electrode 511 on the left side and the second small electrode 521 on the right side face each other with the dielectric film 2 interposed therebetween. A third unit capacitor 10 is formed in a portion (Z3 portion in FIG. 1) where the right first small electrode 511 and the second non-divided electrode 42 face each other with the dielectric film 2 interposed therebetween. These three unit capacitors 10 are connected in series in the lateral direction S. As shown in FIG.

Further, since the plurality of first small electrodes 511 are connected by the first fuse 61 and the plurality of second small electrodes 521 are connected by the second fuse 62, the first electrode 31 and the second electrode 32 At least one of the first fuse 61 and the second fuse 62 is blown even if part of the gap is short-circuited.

Therefore, according to this embodiment, even when used at a high voltage, the function as a whole can be maintained. However, the film capacitor 1 according to this embodiment may be of the wound type or the laminated type.

2. Details (1) First Embodiment Hereinafter, a film capacitor 1 according to a first embodiment will be described with reference to the drawings.

As shown in FIG. 1, the film capacitor 1 includes a dielectric film 2, a first electrode 31 and a second electrode 32.

In the film capacitor 1, the first electrode 31 and the second electrode 32 face each other with the dielectric film 2 (in this embodiment, the first dielectric film 21) interposed therebetween, and are connected in series in the lateral direction S. It contains three unit capacitors 10 (see FIG. 9A).

The dielectric film 2, the first electrode 31, and the second electrode 32 will be described below.

<Dielectric film>
The dielectric film 2 is a film made of a dielectric. The dielectric is not particularly limited, but examples thereof include polypropylene (PP) and polyethylene terephthalate (PET).

The dielectric film 2 has an elongated film shape. That is, the dielectric film 2 is a film extending in the longitudinal direction L orthogonal to the lateral direction S. As shown in FIG.

The dielectric film 2 has a first surface 201 and a second surface 202 (see FIG. 9A). The first surface 201 is a surface facing one side in the thickness direction T of the dielectric film 2 . A thickness direction T is a direction orthogonal to the lateral direction S and the longitudinal direction L. As shown in FIG. The second surface 202 is the surface opposite to the first surface 201 . That is, the second surface 202 is a surface facing the other side in the thickness direction T of the dielectric film 2 .

In this embodiment, the dielectric film 2 includes a first dielectric film 21 and a second dielectric film 22.

<First electrode>
The first electrode 31 may be any of a vapor deposition electrode, a metal foil electrode, and a plated electrode. The material of the first electrode 31 is not particularly limited, but examples thereof include aluminum.

The first electrode 31 is arranged on the first surface 201 of the dielectric film 2 (the first dielectric film 21 in this embodiment).

The first electrode 31 is separated into the first non-split electrode 41 and the first split electrode 51 by the first margin portion 211 .

The first margin portion 211 is a portion of the first surface 201 of the first dielectric film 21 where the first electrode 31 is not arranged. Therefore, the dielectric film 2 is exposed at this portion. The first margin portion 211 extends in the longitudinal direction L with a constant width.

The first undivided electrode 41 is a solid electrode extending in the longitudinal direction L. That is, the first non-divided electrode 41 is arranged entirely between the first margin portion 211 and the end portion on one side (left side) in the transverse direction S of the first dielectric film 21 . A left end portion of the first undivided electrode 41 can be connected to a first end face electrode 310 (not shown in FIG. 1).

On the other hand, the first split electrode 51 is arranged between the first margin portion 211 and the first end margin portion 241 .

Here, the first end margin portion 241 exists at the end of the first dielectric film 21 on the other side (right side) in the transverse direction S. Similarly to the first margin portion 211, the first end margin portion 241 is also a portion where the first electrode 31 is not arranged. Therefore, the dielectric film 2 is also exposed in this portion. The first end margin portion 241 extends in the longitudinal direction L with a constant width. The presence of the first edge margin portion 241 allows the first split electrode 51 and the second edge electrode 320 (not shown in FIG. 1) to be separated from each other. In addition, in the present embodiment, the width of the first end margin portion 241 is the same as the width of the first margin portion 211, but may be different within a range that does not impair the effects of the present embodiment.

Furthermore, the first divided electrode 51 is divided into a plurality of first small electrode groups 510 by at least one or more first lateral direction slit portions 221 .

The first transverse direction slit portion 221 is a portion of the first surface 201 of the first dielectric film 21 where the first electrode 31 is not arranged. Accordingly, the dielectric film 2 is exposed in this portion as well as in the first margin portion 211 and the first end margin portion 241 . The first lateral direction slit portion 221 extends in the lateral direction S with a constant width. The first lateral direction slit portion 221 is connected to the first margin portion 211 and the first end margin portion 241 . In addition, in the present embodiment, the width of the first lateral direction slit portion 221 is the same as the width of the first margin portion 211, but may be different within a range that does not impair the effects of the present embodiment.

The plurality of first small electrode groups 510 are arranged in the longitudinal direction L. Each of the multiple first small electrode groups 510 includes multiple (two in this embodiment) first small electrodes 511 .

The plurality of first small electrodes 511 are arranged in the lateral direction S. In this embodiment, the shape of the first small electrode 511 is rectangular, but is not particularly limited. Also, in this embodiment, the sizes of the plurality of first small electrodes 511 are the same, but they may be different as long as the effects of this embodiment are not impaired.

A plurality of first small electrodes 511 included in each of the plurality of first small electrode groups 510 are connected by a first fuse 61 . The first fuse 61 is a part that melts when an excessive current flows to break the circuit. The first fuse 61 connects the first small electrodes 511 adjacent in the lateral direction S to each other. The width of the first fuse 61 is shorter than the length in the longitudinal direction L of the first small electrode 511 .

<Second electrode>
As with the first electrode 31, the second electrode 32 may also be any of a vapor deposition electrode, a metal foil electrode, and a plated electrode. The material of the second electrode 32 is also the same as the material of the first electrode 31 .

The second electrode 32 is arranged on the second surface 202 of the dielectric film 2 (the first dielectric film 21 in this embodiment). In other words, the second electrode 32 is arranged on the first surface 201 of the second dielectric film 22 in this embodiment.

The second electrode 32 is separated into a second non-split electrode 42 and a second split electrode 52 by a second margin portion 212 .

The second margin portion 212 is a portion of the first surface 201 of the second dielectric film 22 where the second electrode 32 is not arranged. Therefore, the dielectric film 2 is exposed at this portion. The second margin portion 212 extends in the longitudinal direction L with a constant width. In addition, in the present embodiment, the width of the second margin portion 212 is the same as the width of the first margin portion 211, but may be different within a range that does not impair the effects of the present embodiment.

The second non-split electrode 42 is a solid electrode extending in the longitudinal direction L. That is, the second non-divided electrode 42 is arranged entirely between the second margin portion 212 and the other (right) end of the second dielectric film 22 in the transverse direction S. As shown in FIG. The right end of the second non-split electrode 42 can be connected to the second edge electrode 320 .

On the other hand, the second split electrode 52 is arranged between the second margin portion 212 and the second end margin portion 242 .

Here, the second edge margin portion 242 exists at one side (left side) edge in the transverse direction S of the second dielectric film 22 . Similarly to the second margin portion 212, the second end margin portion 242 is also a portion where the second electrode 32 is not arranged. Therefore, the dielectric film 2 is also exposed in this portion. The second end margin portion 242 extends in the longitudinal direction L with a constant width. The presence of the second end margin portion 242 allows the second split electrode 52 and the first end face electrode 310 to be separated from each other. In addition, in the present embodiment, the width of the second end margin portion 242 is the same as the width of the second margin portion 212, but may be different within a range that does not impair the effects of the present embodiment.

Furthermore, the second divided electrode 52 is divided into a plurality of second small electrode groups 520 by at least one or more second lateral direction slit portions 222 .

The second lateral direction slit portion 222 is a portion of the first surface 201 of the second dielectric film 22 where the second electrode 32 is not arranged. Accordingly, the dielectric film 2 is exposed in this portion as well as the second margin portion 212 and the second end margin portion 242 . The second transverse direction slit portion 222 extends in the transverse direction S with a constant width. The second lateral direction slit portion 222 is connected to the second margin portion 212 and the second end margin portion 242 . In addition, in the present embodiment, the width of the second lateral direction slit portion 222 is the same as the width of the second margin portion 212, but may be different within a range that does not impair the effects of the present embodiment. Furthermore, in the present embodiment, the width of the second transverse direction slit portion 222 is the same as the width of the first transverse direction slit portion 221, but may differ within a range that does not impair the effects of the present embodiment.

The plurality of second small electrode groups 520 are arranged in the longitudinal direction L. Each of the multiple second small electrode groups 520 includes multiple (two in this embodiment) second small electrodes 521 .

The plurality of second small electrodes 521 are arranged in the lateral direction S. In this embodiment, the shape of the second small electrode 521 is rectangular, but is not particularly limited. In addition, although the sizes of the plurality of second small electrodes 521 are the same in this embodiment, they may be different as long as the effects of this embodiment are not impaired. Furthermore, in this embodiment, the shape and size of the second small electrode 521 are the same as the shape and size of the first small electrode 511, but they may be different as long as the effects of this embodiment are not impaired.

A plurality of second small electrodes 521 included in each of the plurality of second small electrode groups 520 are connected by a second fuse 62 . Like the first fuse 61, the second fuse 62 is also a part that melts when an excessive current flows to cut off the circuit. The second fuse 62 connects the second small electrodes 521 adjacent to each other in the lateral direction S. As shown in FIG. The width of the second fuse 62 is shorter than the length in the longitudinal direction L of the second small electrode 521 .

The second electrode 32 described above faces the first electrode 31 via the dielectric film 2 (the first dielectric film 21 in this embodiment).

Specifically, there is a portion (Z1 portion in FIG. 1) where the second split electrode 52 of the second electrode 32 faces the first non-split electrode 41 of the first electrode 31 through the dielectric film 2. . More specifically, the second small electrode 521 on the left side of the second electrode 32 faces the first undivided electrode 41 of the first electrode 31 with the dielectric film 2 interposed therebetween. A first unit capacitor 10 is formed in this portion.

There is also a portion (Z2 portion in FIG. 1) where the second split electrode 52 of the second electrode 32 faces the first split electrode 51 of the first electrode 31 with the dielectric film 2 interposed therebetween. More specifically, the second small electrode 521 on the right side of the second electrode 32 faces the first small electrode 511 on the left side of the first electrode 31 with the dielectric film 2 interposed therebetween. A second unit capacitor 10 is formed in this portion.

There is also a portion (Z3 portion in FIG. 1) where the second non-split electrode 42 of the second electrode 32 faces the first split electrode 51 of the first electrode 31 with the dielectric film 2 interposed therebetween. More specifically, the second non-divided electrode 42 of the second electrode 32 faces the first small electrode 511 on the right side of the first electrode 31 with the dielectric film 2 interposed therebetween. A third unit capacitor 10 is formed in this portion.

<Effect>
According to this embodiment, even if the film capacitor 1 is used at a high voltage, the function as a whole can be maintained.

That is, the film capacitor 1 according to this embodiment includes three unit capacitors 10 connected in series in the transverse direction S of the dielectric film 2, like the film capacitor 1 shown in FIG. 9A. Therefore, the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1 shown in FIGS. 7A and 8A and the first end surface electrode 310 and the second end surface of the film capacitor 1 according to the present embodiment When the voltage applied between the electrodes 320 is the same, the voltage applied to the unit capacitor 10 of the film capacitor 1 according to the present embodiment is higher than the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in FIGS. 7A and 8A. By reducing the applied voltage, it becomes easier to suppress damage to the dielectric film 2 .

Furthermore, in the film capacitor 1 according to this embodiment, as shown in FIG. 1, the plurality of first small electrodes 511 are connected by the first fuse 61, and the plurality of second small electrodes 521 are connected by the second fuse. 62 are connected. Therefore, even if a part between the first electrode 31 and the second electrode 32 is short-circuited, at least one of the first fuse 61 and the second fuse 62 is disconnected.

Therefore, according to this embodiment, even if the film capacitor 1 is used at a high voltage, the function as a whole can be maintained.

(2) Second Embodiment Next, a film capacitor 1 according to a second embodiment will be described with reference to the drawings. In the second embodiment, the same reference numerals as in the first embodiment may be assigned to the same components as in the first embodiment, and detailed description thereof may be omitted.

In the film capacitor 1 according to the second embodiment shown in FIG. 2B, the first non-divided electrode 41 and the second electrode 41 are arranged via the dielectric film 2, similarly to the film capacitor 1 according to the first embodiment shown in FIG. 2A. A portion (Z1 portion) facing the divided electrode 52, a portion (Z2 portion) facing the first divided electrode 51 and the second divided electrode 52, and the first divided electrode 51 and the second non-divided electrode 42. A facing portion (Z3 portion) exists.

<<First transverse direction slit part>>
The film capacitor 1 according to the present embodiment differs from the film capacitor 1 according to the first embodiment in that the width of the first lateral direction slit portion 221 differs depending on the location. This point will be described below.

As shown in FIG. 2A, in the film capacitor 1 according to the first embodiment, the width and , and the width of the first transverse direction slit portion 221 at the portion (Z3 portion) where the first split electrode 51 and the second non-split electrode 42 face each other.

By the way, the unit capacitor 10 is formed in the portion where the first electrode 31 and the second electrode 32 face each other, but is not formed in the portion where the first electrode 31 and the second electrode 32 do not face each other. For example, the unit capacitor 10 is not formed in the portion where the first electrode 31 and the second lateral direction slit portion 222 face each other (see the Xa portion surrounded by the dashed-dotted line). Similarly, the unit capacitor 10 is not formed in the portion where the first lateral direction slit portion 221 and the second electrode 32 face each other (see portion Xa).

Therefore, particularly in the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other, compared to the case where the first width direction slit portion 221 and the second width direction slit portion 222 do not face each other, ideally if they are opposite each other. More specifically, it is ideal that the area where the first transverse direction slit portion 221 and the second transverse direction slit portion 222 face each other is large. This is because the capacity of the unit capacitor 10 in the Z2 portion decreases by the amount corresponding to the widths of the first lateral direction slit portion 221 and the second lateral direction slit portion 222 if they do not face each other. Conversely, in the Z2 portion, the electrode area of the unit capacitor 10 (the first electrode 31 and the second electrode 32) is increased, the decrease in the capacity of the unit capacitor 10 can be suppressed.

The above problems are caused by the portion (Z1 portion) where the first undivided electrode 41 and the second undivided electrode 52 face each other and the portion (Z3 portion) where the first divided electrode 51 and the second undivided electrode 42 face each other. ), it almost never occurs. This is because, in the Z1 portion, since the first undivided electrode 41 is a solid electrode, at which position in the longitudinal direction L the second lateral slit portion 222 facing the first undivided electrode 41 exists. This is because the capacitance of the unit capacitor 10 in the Z1 portion does not substantially change. The same applies to the Z3 portion.

On the other hand, in the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other, it is ideal that the first width direction slit portion 221 and the second width direction slit portion 222 face each other. However, in practice, there may be a case where the first transverse direction slit portion 221 and the second transverse direction slit portion 222 do not face each other. One of the reasons for this is that two dielectric films 2 (first dielectric film 21 and second dielectric film 22) are stacked and wound as shown in FIG. In this case, since the first electrode 31 and the second electrode 32 are separated by the thickness of the dielectric film 2 in the thickness direction T, when the two dielectric films 2 are stacked and wound, the winding direction The first electrode 31 and the second electrode 32 shift little by little along the (longitudinal direction L). As a result, the first transverse direction slit portion 221 and the second transverse direction slit portion 222 may not face each other. Then, the capacity of the unit capacitor 10 at the Z2 portion is reduced by a maximum amount corresponding to the sum of the widths of the first transverse direction slit portion 221 and the second transverse direction slit portion 222 (Xa portion), and Z1 and It can be different from the capacitance of the unit capacitor 10 in the Z3 portion. Therefore, when a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the lateral direction S becomes uneven. obtain.

Therefore, in the film capacitor 1 according to the second embodiment shown in FIG. 2B, the width Wa1 of the first lateral direction slit portion 221 at the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other is set to , the width Wb1 of the first lateral direction slit portion 221 at the portion (Z3 portion) where the first split electrode 51 and the second non-split electrode 42 face each other (Wa1<Wb1). As a result, the area of the first electrode 31 in the Z2 portion relatively increases, so even if the first transverse direction slit portion 221 and the second transverse direction slit portion 222 do not face each other, the Z2 portion A decrease in the capacity of the unit capacitor 10 can be suppressed.

<<Second transverse direction slit part>>
Furthermore, the film capacitor 1 according to the present embodiment differs from the film capacitor 1 according to the first embodiment in that the width of the second lateral direction slit portion 222 differs depending on the location. This point will be described below, but the same idea as the above-described first lateral direction slit portion 221 applies to the second lateral direction slit portion 222 as well.

That is, in the film capacitor 1 according to the second embodiment shown in FIG. 2B, the width Wa2 of the second lateral direction slit portion 222 at the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other is , the width Wb2 of the second lateral direction slit portion 222 at the portion (Z1 portion) where the first non-split electrode 41 and the second split electrode 52 face each other (Wa2<Wb2). As a result, the area of the second electrode 32 in the Z2 portion is relatively increased. A decrease in the capacity of the unit capacitor 10 can be further suppressed.

<<First transverse direction slit part and second transverse direction slit part>>
In this embodiment, the relationship between the first transverse direction slit portions 221 in the Z2 and Z3 portions and the second transverse direction slit portions 222 in the Z1 and Z2 portions is also defined.

That is, as shown in FIG. 2B, the width Wa1 of the first lateral direction slit portion 221 and the second lateral direction slit portion 222 at the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face is the width Wb1 of the first lateral direction slit portion 221 at the portion (Z3 portion) where the first split electrode 51 and the second unsplit electrode 42 face each other, and the width Wb1 of the first short-side direction slit portion 221, It is equal to at least one of the width Wb2 of the second lateral direction slit portion 222 in the portion (Z1 portion) facing the two-split electrode 52 .

The relationship between the first transverse direction slit portions 221 in the Z2 and Z3 portions and the second transverse direction slit portions 222 in the Z1 and Z2 portions can be expressed by any of the following (1) to (3) or

(1) Wa1+Wa2=Wb1
(2) Wa1+Wa2=Wb2
(3) Wa1+Wa2=Wb1=Wb2.

In this embodiment, the width Wb1 of the first lateral direction slit portion 221 in the Z3 portion and the width Wb2 of the second lateral direction slit portion 222 in the Z1 portion are equal. Therefore, in this embodiment, the above formula (3) applies in particular. Note that the sum of Wa1 and Wa2 does not have to be exactly equal to Wb1 or Wb2, as long as the effect of the present embodiment is not impaired.

When the above formula (1) holds, the voltage applied to the unit capacitors 10 at least in the Z2 and Z3 portions is less likely to be uneven. The decrease in the capacity of the unit capacitor 10 at the Z2 portion is maximized when the first transverse direction slit portion 221 and the second transverse direction slit portion 222 do not face each other at all (Xb part). In this case, the capacity of the unit capacitor 10 at the Z2 portion is reduced by the sum (Wa1+Wa2) of the widths of the first transverse direction slit portion 221 and the second transverse direction slit portion 222 . However, the sum (Wa1+Wa2) of the widths of the first transverse direction slit portion 221 and the second transverse direction slit portion 222 in the Z2 portion is equal to the width (Wb1) of the first transverse direction slit portion 221 in the Z3 portion. The unit capacitor 10 is not originally formed in the Z3 portion corresponding to this width (Wb1). Therefore, the voltages applied to the unit capacitors 10 at least in the Z2 and Z3 portions are less likely to be uneven.

In the same way of thinking as above, when the above formula (2) holds true, the voltage applied to the unit capacitors 10 at least in the Z1 and Z2 portions is less likely to become non-uniform. Furthermore, when the above formula (3) holds true, the voltage applied to the unit capacitor 10 in the Z1 to Z3 portions is less likely to be non-uniform.

<Effect>
According to this embodiment, in addition to the same effects as those of the first embodiment, the following effects are also achieved.

That is, in the present embodiment, the width Wa1 of the first lateral direction slit portion 221 in the Z2 portion is smaller than the width Wb1 of the first lateral direction slit portion 221 in the Z3 portion (Wa1<Wb1), and the second width in the Z2 portion The width Wa2 of the lateral direction slit portion 222 is smaller than the width Wb2 of the second lateral direction slit portion 222 at the Z1 portion (Wa2<Wb2).

Therefore, even if the first transverse direction slit portion 221 and the second transverse direction slit portion 222 in the Z2 portion do not face each other in the thickness direction T and are shifted in the longitudinal direction L, the electrodes of the unit capacitor 10 in the Z2 portion The area does not largely deviate from the electrode area of the unit capacitor 10 in the Z1 and Z3 portions.

Therefore, according to this embodiment, when a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage is applied to the three unit capacitors 10 connected in series in the lateral direction S. The voltage applied is less likely to be uneven. In other words, it is possible to prevent the voltage applied to a specific unit capacitor from becoming excessively large.

(3) Third Embodiment Next, a film capacitor 1 according to a third embodiment will be described with reference to the drawings. In the third embodiment, components similar to those in the first and second embodiments are given the same reference numerals as those in the first and second embodiments, and detailed description thereof may be omitted.

The film capacitor 1 according to the third embodiment shown in FIGS. 3 and 4 includes a first non-divided electrode 41 and a second divided electrode 41 via the dielectric film 2 in the same manner as the film capacitor 1 according to the first embodiment. A portion (Z1 portion) facing the electrode 52, a portion (Z2 portion) facing the first divided electrode 51 and the second divided electrode 52, and a portion (Z2 portion) facing the first divided electrode 51 and the second non-divided electrode 42. There is a part (Z3 part) that does.

<<First transverse direction slit part>>
The film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the number of first lateral direction slit portions 221 differs depending on the location. In this embodiment, the problem described in the second embodiment is to be solved by changing the number of first lateral direction slit portions 221 depending on the location. This point will be described below.

Specifically, in the present embodiment, the number of first lateral direction slit portions 221 in the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other is equal to the number of the first split electrode 51 and the second split electrode 52. It is smaller than the number of the first transverse direction slit portions 221 in the portion (Z3 portion) facing the two non-divided electrodes 42 .

That is, in the first embodiment, all the first lateral direction slit portions 221 are connected to the first margin portions 211 and the first end margin portions 241 (see FIG. 1), but in the present embodiment, at least One or more first lateral direction slit portions 221 are connected to the first end margin portion 241 and are not connected to the first margin portion 211 (see Y1 portion surrounded by the dashed line in FIG. 4).

In this embodiment, the shape and size of the plurality of first small electrodes 511 included in the first small electrode group 510 are different. Although not particularly limited, as shown in FIG. 3, the first small electrode 511a has a rectangular shape that is longer in the longitudinal direction L than the first small electrode 511b.

The first small electrode 511a is arranged in the Z2 portion. The first small electrode 511b is arranged in the Z3 portion. The first small electrode 511 a is connected to each of the plurality of first small electrodes 511 b by a first fuse 61 .

As described above, the number of the first lateral direction slits 221 in the Z2 portion is made smaller than the number of the first lateral direction slits 221 in the Z3 portion, and the area of the first electrode 31 in the Z2 portion is relatively large. is increasing significantly. Thereby, even if the first transverse direction slit portion 221 and the second transverse direction slit portion 222 do not face each other in the Z2 portion, it is possible to suppress a decrease in the capacity of the unit capacitor 10 in the Z2 portion.

<<Second transverse direction slit part>>
Furthermore, the film capacitor 1 according to the present embodiment differs from the film capacitor 1 according to the first embodiment in that the number of the second lateral direction slit portions 222 differs depending on the location. This point will be described below, but the same idea as the above-described first lateral direction slit portion 221 applies to the second lateral direction slit portion 222 as well.

Specifically, in the present embodiment, the number of second lateral direction slit portions 222 in the portion (Z2 portion) where the first split electrode 51 and the second split electrode 52 face each other is equal to that of the first non-split electrode 41. It is smaller than the number of the second lateral direction slit portions 222 in the portion (Z1 portion) facing the second split electrode 52 .

That is, in the first embodiment, all the second lateral direction slit portions 222 are connected to the second margin portions 212 and the second end margin portions 242 (see FIG. 1), but in the present embodiment, at least One or more second lateral direction slit portions 222 are connected to the second end margin portion 242 and are not connected to the second margin portion 212 (see Y2 portion surrounded by the dashed line in FIG. 4).

In this embodiment, the shape and size of the plurality of second small electrodes 521 included in the second small electrode group 520 are different. Although not particularly limited, as shown in FIG. 3, the second small electrode 521a has a rectangular shape that is longer in the longitudinal direction L than the second small electrode 521b.

The second small electrode 521a is arranged in the Z2 portion. The second small electrode 521b is arranged in the Z1 portion. The second small electrode 521 a is connected to each of the plurality of second small electrodes 521 b by a second fuse 62 .

As described above, the number of the second lateral direction slit portions 222 in the Z2 portion is made smaller than the number of the second lateral direction slit portions 222 in the Z1 portion, and the area of the second electrode 32 in the Z2 portion is relatively large. is increasing significantly. Thereby, even if the first transverse direction slit portion 221 and the second transverse direction slit portion 222 do not face each other in the Z2 portion, it is possible to suppress a decrease in the capacity of the unit capacitor 10 in the Z2 portion.

That is, in the present embodiment, the number of the first transverse direction slits 221 in the Z2 portion is smaller than the number of the first transverse direction slits 221 in the Z3 portion, and the number of the second transverse direction slits 222 in the Z2 portion is The number is smaller than the number of the second transverse direction slit portions 222 in the Z1 portion.

(4) Fourth Embodiment Next, a film capacitor 1 according to a fourth embodiment will be described with reference to the drawings. In the fourth embodiment, the same reference numerals as in the first to third embodiments may be assigned to the same components as in the first to third embodiments, and detailed description thereof may be omitted.

The film capacitor 1 according to this embodiment is common to the film capacitors 1 according to the first to third embodiments in that it includes three unit capacitors 10 connected in series in the lateral direction S, but the film capacitor 1 according to the lateral direction S is different from the film capacitors 1 according to the first to third embodiments in that it can include four or more unit capacitors 10 connected in series.

That is, the film capacitor 1 according to this embodiment is obtained by expanding or generalizing the number of unit capacitors 10 connected in series in the lateral direction S to three or more. Hereinafter, the number of unit capacitors 10 connected in series in the lateral direction S is assumed to be n (where n≧3).

Note that FIGS. 5 and 6 show an example of the film capacitor 1 when n=4. The film capacitor 1 has a portion (Z1 and Z4 portions) where the first non-split electrode 41 and the second split electrode 52 face each other through the dielectric film 2, and the first split electrode 51 and the second split electrode. 52 (Z2 and Z3 portions) are present.

<Dielectric film>
The dielectric film 2 of this embodiment is the same as the dielectric films 2 of the first to third embodiments.

<First electrode>
[When n is an odd number of 3 or more]
The first electrode 31 is separated by at least one or more first margin portions 211 into at least one or more first non-split electrodes 41 and at least one or more first split electrodes 51 . In particular, the first electrodes 31 are separated into (n+1)/2 pieces. As a specific example, when n=3, the first electrode 31 is separated into two (see FIG. 1). For example, the first electrode 31 is separated into one first non-split electrode 41 and one first split electrode 51 by one first margin portion 211 .

Furthermore, the first electrode 31 is connected to the first edge electrode 310 but not to the second edge electrode 320 . To give a specific example, when n=3, the first undivided electrode 41 arranged on one side (left side) in the transverse direction S of the dielectric film 2 is connected to the first end surface electrode 310. The first split electrode 51 arranged on the other side (right side) of the dielectric film 2 in the transverse direction S is not connected to the second edge electrode 320 .

[When n is an even number of 4 or more]
The first electrode 31 is separated by at least one or more first margin portions 211 into at least one or more first non-split electrodes 41 and at least one or more first split electrodes 51 . In particular, the first electrodes 31 are separated into (n+2)/2 pieces. As a specific example, when n=4, the first electrode 31 is separated into three (see FIGS. 5 and 6). For example, the first electrode 31 is separated into two first non-split electrodes 41 and one first split electrode 51 by two first margin portions 211 .

Furthermore, the first electrode 31 is connected to the first edge electrode 310 and the second edge electrode 320 . As a specific example, when n=4, the first non-divided electrode 41 arranged on one side (left side) in the transverse direction S of the dielectric film 2 is connected to the first end surface electrode 310, The first non-split electrode 41 arranged on the other side (right side) of the dielectric film 2 in the transverse direction S is connected to the second end surface electrode 320 .

[When n is an integer of 3 or more]
The first non-split electrode 41 is preferably connected to the edge electrode 30 .

<Second electrode>
[When n is an odd number of 3 or more]
The second electrodes 32 are separated by at least one or more second margin portions 212 while including at least one or more second split electrodes 52 . In particular, the second electrodes 32 are separated into (n+1)/2 pieces. As a specific example, when n=3, the second electrode 32 is separated into two (see FIG. 1). For example, the second electrode 32 is separated into one second split electrode 52 and one second non-split electrode 42 by one second margin portion 212 . Thus, when the second electrode 32 includes only one second split electrode 52 , the second electrode 32 further includes at least one or more second non-split electrodes 42 .

Furthermore, the second electrode 32 is not connected to the first edge electrode 310 but is connected to the second edge electrode 320 . As a specific example, when n=3, the second split electrode 52 arranged on one side (left side) in the transverse direction S of the dielectric film 2 is not connected to the first end surface electrode 310, but the dielectric The second non-split electrode 42 arranged on the other side (right side) of the film 2 in the transverse direction S is connected to the second edge electrode 320 .

[When n is an even number of 4 or more]
The second electrodes 32 are separated by at least one or more second margin portions 212 while including at least one or more second split electrodes 52 . In particular, the second electrodes 32 are separated into n/2 pieces. As a specific example, when n=4, the second electrode 32 is separated into two (see FIGS. 5 and 6). For example, the second electrode 32 is separated into two second split electrodes 52 by one second margin portion 212 . Thus, when the second electrode 32 includes two or more second split electrodes 52, each second small electrode group 520 is arranged in the lateral direction S (see FIG. 6). On the other hand, when the second electrode 32 includes only one second split electrode 52 , the second electrode 32 further includes at least one or more second non-split electrodes 42 .

Furthermore, the second electrode 32 is not connected to the first edge electrode 310 and the second edge electrode 320 . As a specific example, when n=4, the second split electrode 52 arranged on one side (left side) of the dielectric film 2 in the transverse direction S is not connected to the first end face electrode 310, and the dielectric The second split electrode 52 arranged on the other side (right side) of the film 2 in the transverse direction S is also not connected to the second edge electrode 320 .

[When n is an integer of 3 or more]
If the second electrode 32 includes a second unsplit electrode 42 , the second unsplit electrode 42 is preferably connected to the edge electrode 30 .

That is, the film capacitor 1 according to this embodiment includes three or more unit capacitors 10 connected in series in the transverse direction S of the dielectric film 2 (see FIGS. 5 and 9A). Therefore, the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1 shown in FIGS. 7A and 8A and the first end surface electrode 310 and the second end surface of the film capacitor 1 according to the present embodiment When the voltage applied between the electrodes 320 is the same, the voltage applied to the unit capacitor 10 of the film capacitor 1 according to the present embodiment is higher than the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in FIGS. 7A and 8A. By reducing the applied voltage, it becomes easier to suppress damage to the dielectric film 2 .

Furthermore, in the film capacitor 1 according to this embodiment, the plurality of first small electrodes 511 are connected by the first fuse 61, and the plurality of second small electrodes 521 are connected by the second fuse 62 ( 1 and 6). Therefore, even if a part between the first electrode 31 and the second electrode 32 is short-circuited, at least one of the first fuse 61 and the second fuse 62 is disconnected.

1 film capacitor 10 unit capacitor 2 dielectric film 201 first surface 202 second surface 211 first margin part 212 second margin part 221 first transverse direction slit part 222 second transverse direction slit part 31 first electrode 32 second 2 electrodes 41 first unsplit electrode 42 second unsplit electrode 51 first split electrode 510 first small electrode group 511 first small electrode 52 second split electrode 520 second small electrode group 521 second small electrode 61 first fuse 62 Second fuse S Transverse direction L Longitudinal direction Wa1 width Wb1 width Wa2 width Wb2 width

Claims

a dielectric film having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the transverse direction;
a first electrode disposed on the first surface;
a second electrode disposed on the second surface;
three unit capacitors connected in series in the lateral direction by facing the first electrode and the second electrode via the dielectric film;
the first electrode is separated into a first non-split electrode extending in the longitudinal direction and a first split electrode by the first margin portion extending in the longitudinal direction;
The first divided electrodes are divided into a plurality of first small electrode groups aligned in the longitudinal direction by first transverse direction slit portions extending in the transverse direction,
each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse;
the second electrode is separated into a second non-split electrode extending in the longitudinal direction and a second split electrode by the second margin portion extending in the longitudinal direction;
The second divided electrodes are divided into a plurality of second small electrode groups aligned in the longitudinal direction by second transverse direction slit portions extending in the transverse direction,
each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse;
Film capacitor.
A portion where the first non-split electrode and the second split electrode face each other, a portion where the first split electrode and the second split electrode face each other, and the first split electrode, with the dielectric film interposed therebetween. and a portion where the second undivided electrode faces,
The width of the first transverse direction slit portion at the portion where the first split electrode and the second split electrode face each other is the first width at the portion where the first split electrode and the second non-split electrode face each other. smaller than the width of the slit in the transverse direction,
The film capacitor according to claim 1.
The width of the second transverse direction slit portion at the portion where the first split electrode and the second split electrode face each other is the second width at the portion where the first non-split electrode and the second split electrode face each other. smaller than the width of the slit in the transverse direction,
3. A film capacitor according to claim 2.
A portion where the first non-split electrode and the second split electrode face each other, a portion where the first split electrode and the second split electrode face each other, and the first split electrode, with the dielectric film interposed therebetween. and a portion where the second undivided electrode faces,
The sum of the width of the first width direction slit portion and the width of the second width direction slit portion in the portion where the first division electrode and the second division electrode face each other is the sum of the width of the first division electrode and the width of the second division electrode. Width of the first transverse direction slit portion at the portion where the two undivided electrodes face each other, and width of the second transverse direction slit portion at the portion where the first undivided electrode and the second divided electrode face each other. equal to at least one of
A film capacitor according to any one of claims 1 to 3.
A portion where the first non-split electrode and the second split electrode face each other, a portion where the first split electrode and the second split electrode face each other, and the first split electrode, with the dielectric film interposed therebetween. and a portion where the second undivided electrode faces,
The number of the first transverse direction slit portions in the portion where the first split electrode and the second split electrode face each other is the first number in the portion where the first split electrode and the second non-split electrode face each other. less than the number of slits in the transverse direction,
A film capacitor according to any one of claims 1 to 4.
The number of the second transverse direction slit portions in the portion where the first split electrode and the second split electrode face each other is the second number in the portion where the first non-split electrode and the second split electrode face each other. less than the number of slits in the transverse direction,
The film capacitor according to claim 5.
a dielectric film having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the transverse direction;
a first electrode disposed on the first surface;
a second electrode disposed on the second surface;
including three or more odd-numbered unit capacitors connected in series in the lateral direction by the first electrode and the second electrode facing each other through the dielectric film;
At least one or more first undivided electrodes extending in the longitudinal direction and at least one or more first segmented electrodes are formed by at least one or more first margin portions extending in the longitudinal direction. separated into
The first divided electrodes are divided into a plurality of first small electrode groups aligned in the longitudinal direction by first transverse direction slit portions extending in the transverse direction,
each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse;
the second electrode is separated by at least one or more second margin portions extending in the longitudinal direction while including at least one or more second split electrodes;
The second divided electrodes are divided into a plurality of second small electrode groups aligned in the longitudinal direction by second transverse direction slit portions extending in the transverse direction,
each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse;
Film capacitor.
a dielectric film having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the transverse direction;
a first electrode disposed on the first surface;
a second electrode disposed on the second surface;
including four or more even number of unit capacitors connected in series in the transverse direction by the first electrode and the second electrode facing each other through the dielectric film;
At least one or more first undivided electrodes extending in the longitudinal direction and at least one or more first segmented electrodes are formed by at least one or more first margin portions extending in the longitudinal direction. separated into
The first divided electrodes are divided into a plurality of first small electrode groups aligned in the longitudinal direction by first transverse direction slit portions extending in the transverse direction,
each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse;
the second electrode is separated by at least one or more second margin portions extending in the longitudinal direction while including at least one or more second split electrodes;
The second divided electrodes are divided into a plurality of second small electrode groups aligned in the longitudinal direction by second transverse direction slit portions extending in the transverse direction,
each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse;
Film capacitor.