Film capacitor

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. The first electrode is separated into two large segmented electrodes by a first margin part. Each of the two large segmented electrodes is divided into a plurality of partial electrodes by a first short side direction slit part. The second electrode is a small segmented electrode, and end margin parts are located on both sides in the short direction of the small segmented electrode. The small segmented electrode is divided into a plurality of small electrode groups by a second short side direction slit part.

Description

Technical Field

[0001] The present disclosure generally relates to film capacitors, and more particularly to film capacitors used in electronic devices, electrical devices, industrial devices, automobiles, and the like.

Background Art

[0002] Patent Document 1 discloses a film capacitor. This film capacitor adopts a structure in which two capacitors are connected in series.

[0003] Specifically, the film capacitor of Patent Document 1 is a film capacitor having a structure in which two films are stacked and wound in a cylindrical shape.

[0004] On one side of one of the two films, two common electrodes are deposited, which are divided into two in the film width direction orthogonal to the winding direction and continuous in the winding direction.

[0005] On the other side of the one film or on one side of the other film, partial electrodes are deposited, which are divided into two in the film width direction and divided into a plurality in the winding direction.

[0006] Among the divided partial electrodes, two partial electrodes arranged side by side in the film width direction are connected to each other through a safety mechanism located between the two partial electrodes for each group.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, the film capacitor described in Patent Document 1 had the problem that it could not mitigate the sudden current concentration that occurs when dielectric breakdown occurs. When current concentrates, the risk of through-fire breakdown increases.

[0009] The purpose of this disclosure is to provide a film capacitor that can reduce the risk of penetration failure even if dielectric breakdown occurs. [Means for solving the problem]

[0010] A film capacitor according to one aspect of the present disclosure comprises a dielectric film having a first surface and a second surface opposite to the first surface, extending in a longitudinal direction perpendicular to the short direction, a first electrode disposed on the first surface, and a second electrode disposed on the second surface.

[0011] The film capacitor includes two unit capacitors connected in series in the short direction, with the first electrode and the second electrode facing each other via the dielectric film.

[0012] The first electrode is divided into two large divided electrodes by the first margin portion extending in the longitudinal direction. Divide It is being done.

[0013] Each of the two large divided electrodes is divided into a plurality of partial electrodes aligned in the longitudinal direction by a first short-direction slit portion extending in the short-direction direction.

[0014] The second electrode is a segmented electrode, and there are end margins extending in the longitudinal direction on both sides of the segmented electrode in the short direction.

[0015] The aforementioned small divided electrode is divided into a plurality of small electrode groups arranged in the longitudinal direction by a second short-direction slit portion extending in the short-direction direction. [Effects of the Invention]

[0016] According to the present disclosure, even if dielectric breakdown occurs, the risk of reaching through-breakdown can be reduced.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is an explanatory diagram showing a film capacitor according to the first embodiment. [Figure 2] FIG. 2 is an explanatory diagram showing a film capacitor according to the second embodiment. [Figure 3] FIG. 3 is an explanatory diagram showing a film capacitor according to the third embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view showing a film capacitor according to the fourth embodiment. [Figure 5] FIG. 5 is an explanatory diagram showing the same film capacitor. [Figure 6] FIG. 6 is an explanatory diagram showing a film capacitor according to the fifth embodiment. [Figure 7] FIG. 7A is a schematic cross-sectional view showing a film capacitor including one unit capacitor in the short side direction. FIG. 7B is an explanatory diagram showing the same film capacitor. [Figure 8] FIG. 8A is a schematic cross-sectional view showing a film capacitor including two unit capacitors connected in series in the short side direction. FIG. 8B is an explanatory diagram showing the same film capacitor. [Figure 9] FIG. 9A is a schematic cross-sectional view showing a film capacitor including three unit capacitors connected in series in the short side direction. FIG. 9B is an explanatory diagram showing the same film capacitor. [Figure 10] FIG. 10 is a schematic perspective view showing an example of a film capacitor.

Embodiments for Carrying Out the Invention

[0018] 1. Overview Figure 10 shows an example of a film capacitor 1. The film capacitor 1 is, for example, cylindrical in shape. The film capacitor 1 is formed, for example, by overlapping and winding two elongated dielectric films 2 (a first dielectric film 21 and a second dielectric film 22).

[0019] Here, a 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 via the dielectric film 2. End electrodes 30 (first end electrode 310 and second end electrode 320) are formed at both ends of the film capacitor 1. The first electrode 31 is connected to the first end electrode 310. The second electrode 32 is connected to the second end electrode 320. The film capacitor 1 can be charged by applying a voltage between the first end electrode 310 and the second end electrode 320.

[0020] The film capacitor 1 may contain 1 to 3 unit capacitors 10 in the short-side direction S (width direction) of the dielectric film 2 (see Figures 7A, 8A, and 9A). This point will be explained below. Note that one side of the short-side direction S may be referred to as the "left side" and the other side as the "right side".

[0021] The film capacitor 1 shown in Figure 7A includes one unit capacitor 10 in the short-side direction S of the dielectric film 2.

[0022] As shown in Figure 7B, a first end margin 241 is located at the right end of one side of the first dielectric film 21. The first electrode 31 is located on the entire side of the first dielectric film 21, excluding the first end margin 241. The first electrode 31 includes the left end of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this point (see Figure 7A). Due to the presence of the first end margin 241, the first electrode 31 and the second end electrode 320 are spaced apart.

[0023] On the other hand, a second end margin portion 242 is located at the left end of one side of the second dielectric film 22. The second electrode 32 is located 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 end of one side of the second dielectric film 22 and is connected to the second end electrode 320 at this point (see Figure 7A). Due to the presence of the second end margin portion 242, the second electrode 32 and the first end electrode 310 are spaced apart.

[0024] Then, as shown in Figure 7A, a single unit capacitor 10 is formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21).

[0025] Furthermore, the film capacitor 1 shown in Figure 8A includes two unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2.

[0026] As shown in Figure 8B, the first electrode 31 is divided into left and right sides by the first margin portion 211. The left side of the first electrode 31 includes the left edge of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this portion. The right side of the first electrode 31 includes the right edge of one side of the first dielectric film 21 and is connected to the second end electrode 320 at this portion (see Figure 8A).

[0027] On the other hand, second end margins 242 are provided at the left and right ends of one side of the second dielectric film 22. The second electrode 32 is positioned across the entire area between the second end margins 242 on both sides. The presence of the second end margins 242 on both sides causes the second electrode 32 to be spaced apart from the first end electrode 310 and the second end electrode 320.

[0028] As shown in Figure 8A, two unit capacitors 10 are formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21). These unit capacitors 10 are connected in series in the short-side direction S.

[0029] Therefore, when the voltage applied to the film capacitor 1 shown in Figure 7A and Figure 8A is the same, the film capacitor 1 shown in Figure 8A has a lower voltage applied to the unit capacitor 10, which makes it easier to suppress damage to the dielectric film 2.

[0030] Furthermore, the film capacitor 1 shown in Figure 9A includes three unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2.

[0031] As shown in Figure 9B, the first electrode 31 is divided into left and right sides by the first margin portion 211. The left side of the first electrode 31 includes the left edge of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this portion (see Figure 9A). The first end margin portion 241 is located at the right edge of one side of the first dielectric film 21. The right side of the first electrode 31 is located throughout the space between the first margin portion 211 and the first end margin portion 241. The presence of the first end margin portion 241 causes the right side of the first electrode 31 and the second end electrode 320 to be separated.

[0032] On the other hand, the second electrode 32 is divided into left and right sides by the second margin portion 212. The right side of the second electrode 32 includes the right edge of one side of the second dielectric film 22 and is connected to the second end electrode 320 at this portion (see Figure 9A). A second end margin portion 242 is located at the left edge of one side of the second dielectric film 22. The left side of the second electrode 32 is located throughout the space between the second end margin portion 242 and the second margin portion 212. Due to the presence of the second end margin portion 242, the left side of the second electrode 32 and the first end electrode 310 are spaced apart.

[0033] As shown in Figure 9A, three unit capacitors 10 are formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21). These unit capacitors 10 are connected in series in the short-side direction S.

[0034] Therefore, when the voltage applied to the film capacitors 1 shown in Figures 7A, 8A, and 9A is the same, the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in Figure 9A will be the smallest, which further helps to suppress damage to the dielectric film 2.

[0035] The inventors have made further improvements to a film capacitor 1 in which multiple unit capacitors 10 are connected in series in the short direction S, and have developed the following film capacitor 1.

[0036] In other words, as shown in Figure 1, the first electrode 31 is divided into two large divided electrodes 7 by the first margin portion 211. Divide Each of the two large divided electrodes 7 is divided into a plurality of partial electrodes 710 by a first short-direction slit portion 221.

[0037] On the other hand, the second electrode 32 is a divided electrode 8. End margin portions 242 exist on both sides of the divided electrode 8 in the short direction S. The divided electrode 8 is divided into a plurality of small electrode groups 520 by a second short-direction slit portion 222. Each small electrode group 520 includes a plurality of small electrodes 521.

[0038] Then, the first unit capacitor 10 is formed in the area where the large divided electrode 7 on the left and the small electrode 521 on the left face each other via the dielectric film 2 (area Z1 in Figure 1). A second unit capacitor 10 is formed in the area where the large divided electrode 7 on the right and the small electrode 521 on the right face each other via the dielectric film 2 (area Z2 in Figure 1). These two unit capacitors 10 are connected in series in the short-side direction S.

[0039] As described above, each of the two large divided electrodes 7 of the first electrode 31 is divided into multiple partial electrodes 710, and the small divided electrodes 8 of the second electrode 32 are also divided into multiple small electrode groups 520. Therefore, even if dielectric breakdown occurs in a certain part between the first electrode 31 and the second electrode 32 (for example, point P in Figure 1), the first short-direction slit portion 221 and the second short-direction slit portion 222 can prevent current from flowing into this dielectric breakdown area from another part (point Q in Figure 1).

[0040] Therefore, according to this embodiment, even if dielectric breakdown occurs, the risk of through-hole breakdown can be reduced. However, the film capacitor 1 according to this embodiment may be either wound or laminated.

[0041] In this specification, "dielectric breakdown" refers to the phenomenon in which the dielectric film 2 becomes unable to maintain the applied voltage when a voltage is applied to it. "Through breakdown" refers to a complete breakdown that occurs not on the surface of the dielectric film 2, but through its interior.

[0042] 2.Details (1) First Embodiment The film capacitor 1 according to the first embodiment will be described below with reference to the drawings.

[0043] As shown in Figure 1, the film capacitor 1 comprises a dielectric film 2, a first electrode 31, and a second electrode 32.

[0044] The film capacitor 1 includes two unit capacitors 10 connected in series in the short direction S, with a first electrode 31 and a second electrode 32 facing each other via a dielectric film 2 (first dielectric film 21 in this embodiment) (see Figure 8A).

[0045] The dielectric film 2, the first electrode 31, and the second electrode 32 will be described below.

[0046] <Dielectric film> The dielectric film 2 is a film composed of a dielectric material. The dielectric material is not particularly limited, but examples include polypropylene (PP) and polyethylene terephthalate (PET).

[0047] The dielectric film 2 is in the form of an elongated film. That is, the dielectric film 2 is a film that extends in the longitudinal direction L, which is perpendicular to the short direction S.

[0048] The dielectric film 2 has a first surface 201 and a second surface 202 (see Figure 8A). The first surface 201 is the surface facing one side in the thickness direction T of the dielectric film 2. The thickness direction T is perpendicular to the short side S and the long side L. The second surface 202 is the surface opposite to the first surface 201. That is, the second surface 202 is the surface facing the other side in the thickness direction T of the dielectric film 2.

[0049] In this embodiment, the dielectric film 2 includes a first dielectric film 21 and a second dielectric film 22.

[0050] <1st electrode> The first electrode 31 may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode. The material of the first electrode 31 is not particularly limited, but examples include aluminum.

[0051] The first electrode 31 is positioned on the first surface 201 of the dielectric film 2 (first dielectric film 21 in this embodiment).

[0052] The first electrode 31 is divided into two large divided electrodes 7 by the first margin portion 211. Divide It is being done.

[0053] The first margin portion 211 is the portion on the first surface 201 of the first dielectric film 21 where the first electrode 31 is not located. Therefore, the dielectric film 2 is exposed in this portion. The first margin portion 211 extends in the longitudinal direction L with a constant width.

[0054] One of the two large divided electrodes 7 is the electrode positioned on one side (left side) of the short direction S. The other of the two large divided electrodes 7 is the electrode positioned on the other side (right side) of the short direction S.

[0055] Each of the two large divided electrodes 7 is divided into a plurality of partial electrodes 710 by at least one first short-direction slit portion 221.

[0056] The first short-side slit portion 221 is a portion of the first surface 201 of the first dielectric film 21 where the first electrode 31 is not located. Therefore, the dielectric film 2 is exposed in this portion as well as in the first margin portion 211. The first short-side slit portion 221 extends in the short-side direction S with a constant width. The first short-side slit portion 221 is connected to one side (left) and the other side (right) of the short-side direction S of the first dielectric film 21. Therefore, the first short-side slit portion 221 intersects with the first margin portion 211. In this embodiment, the width of the first short-side slit portion 221 is the same as the width of the first margin portion 211, but it may differ within a range that does not impair the effects of this embodiment.

[0057] Multiple partial electrodes 710 are arranged in the longitudinal direction L. In this embodiment, the shape of the partial electrodes 710 is rectangular, but is not particularly limited. Also, in this embodiment, the multiple partial electrodes 710 are the same size, but they may differ as long as the effects of this embodiment are not impaired.

[0058] <Second electrode> The second electrode 32, like the first electrode 31, may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode. The material of the second electrode 32 is the same as the material of the first electrode 31.

[0059] The second electrode 32 is located on the second surface 202 of the dielectric film 2 (the first dielectric film 21 in this embodiment). In other words, in this embodiment, the second electrode 32 is located on the first surface 201 of the second dielectric film 22.

[0060] The second electrode 32 is a divided electrode 8. End margins 242 exist on both sides of the divided electrode 8 in the short direction S.

[0061] The end margins 242 are located at one end (left side) and the other end (right side) of the second dielectric film 22 in the short direction S. The end margins 242 are the parts where the second electrode 32 is not located. Therefore, the dielectric film 2 is exposed in these parts. The end margins 242 extend in the longitudinal direction L with a constant width. The presence of the end margins 242 allows the second electrode 32 (small segmented electrode 8) to be separated from the first end face electrode 310 and the second end face electrode 320.

[0062] Furthermore, the small divided electrode 8 is divided into a plurality of small electrode groups 520 by at least one second short-direction slit portion 222.

[0063] The second short-side slit portion 222 is the portion on the first surface 201 of the second dielectric film 22 where the second electrode 32 is not located. Therefore, the dielectric film 2 is exposed in this portion as well, similar to the end margin portion 242. The second short-side slit portion 222 extends in the short-side direction S with a constant width. The second short-side slit portion 222 is connected to the end margin portions 242 on both the left and right sides. In this embodiment, the width of the second short-side slit portion 222 is the same as the width of the end margin portion 242, but it may differ within a range that does not impair the effects of this embodiment. Furthermore, in this embodiment, the width of the second short-side slit portion 222 is the same as the width of the first short-side slit portion 221, but it may differ within a range that does not impair the effects of this embodiment.

[0064] Multiple small electrode groups 520 are arranged in the longitudinal direction L. Each small electrode group 520 includes multiple (two in this embodiment) small electrodes 521.

[0065] Multiple small electrodes 521 are arranged in the short direction S. In this embodiment, the shape of the small electrodes 521 is rectangular, but is not particularly limited. Also, in this embodiment, the multiple small electrodes 521 are the same size, but they may be different as long as it does not impair the effects of this embodiment.

[0066] Multiple small electrodes 521 contained in each of the multiple small electrode groups 520 are connected by a fuse 62. The fuse 62 is the part that melts when an excessive current flows, interrupting the circuit. The fuse 62 connects adjacent small electrodes 521 in the short direction S. The width of the fuse 62 is shorter than the length L in the long direction of the small electrodes 521.

[0067] The second electrode 32 described above faces the first electrode 31 via a dielectric film 2 (in this embodiment, the first dielectric film 21).

[0068] Specifically, the second electrode 32 (small segmented electrode 8) has a portion (part Z1 in Figure 1) that faces the large segmented electrode 7 on the left side of the first electrode 31 via the dielectric film 2. More precisely, the small electrode 521 on the left side of the second electrode 32 faces the partial electrode 710 on the left side of the first electrode 31 via the dielectric film 2. The first unit capacitor 10 is formed in this portion.

[0069] Furthermore, the second electrode 32 (small segmented electrode 8) has a portion (part Z2 in Figure 1) that faces the large segmented electrode 7 on the right side of the first electrode 31 via the dielectric film 2. More specifically, the small electrode 521 on the right side of the second electrode 32 faces the partial electrode 710 on the right side of the first electrode 31 via the dielectric film 2. A second unit capacitor 10 is formed in this portion.

[0070] The film capacitor 1 according to this embodiment includes a plurality of unit capacitor groups (the portion C enclosed by the dashed line in Figure 1 represents one unit capacitor group). The plurality of unit capacitor groups are arranged in the longitudinal direction L. Each of the plurality of unit capacitor groups is connected to an end face electrode 30 (a first end face electrode 310 and a second end face electrode 320). In other words, the plurality of unit capacitor groups are connected in parallel. Each unit capacitor group includes two unit capacitors 10 connected in series in the short direction S.

[0071] <Effects and Effects> For example, as shown in Figure 8, if dielectric breakdown occurs at point P, current can flow in from the surrounding area toward point P. If point Q is a point around point P, current can flow in from point Q toward point P in a straight line. This could lead to a rapid breakdown from dielectric breakdown to through breakdown.

[0072] One reason why the current flows linearly from point Q to point P is that the first electrode 31 is a solid electrode that extends in the longitudinal direction L.

[0073] In contrast, in this embodiment, for example, as shown in Figure 1, if dielectric breakdown occurs at point P on a certain partial electrode 710, current is less likely to flow from point Q on another partial electrode 710 toward point P. In other words, current concentration is mitigated. One reason for this is that the partial electrode 710 where point P is located and the partial electrode 710 where point Q is located are separated by the first short-direction slit portion 221. In other words, the first electrode 31 is divided into multiple parts in the longitudinal direction L.

[0074] Thus, in this embodiment, each of the two large divided electrodes 7 of the first electrode 31 is divided into a plurality of partial electrodes 710, and the small divided electrodes 8 of the second electrode 32 are also divided into a plurality of small electrode groups 520. Therefore, even if dielectric breakdown occurs in a portion between the first electrode 31 and the second electrode 32, the first short-direction slit portion 221 and the second short-direction slit portion 222 can prevent current from flowing into the dielectric breakdown portion from other portions.

[0075] Therefore, according to this embodiment, even if dielectric breakdown occurs, the risk of it progressing to through-breakdown can be reduced.

[0076] (2) Second Embodiment Next, the film capacitor 1 according to the second embodiment will be described with reference to the drawings. In the second embodiment, components similar to those in the first embodiment may be given the same reference numerals as in the first embodiment, and detailed descriptions may be omitted.

[0077] As shown in Figure 2, the film capacitor 1 according to this embodiment is similar to the film capacitor 1 according to the first embodiment shown in Figure 1 in that both the first electrode 31 and the second electrode 32 are divided into multiple parts in the longitudinal direction L, but it differs from the film capacitor 1 according to the first embodiment in that there are three unit capacitors 10 connected in series in the short direction S.

[0078] In other words, the film capacitor 1 according to this embodiment includes three unit capacitors 10 connected in series in the short direction S, with the first electrode 31 and the second electrode 32 facing each other via a dielectric film 2 (first dielectric film 21 in this embodiment) (see Figure 9A).

[0079] The following will focus on explaining the differences from the first embodiment.

[0080] <1st electrode> The first electrode 31 is divided by the first margin portion 211 into a first large divided electrode 71 and a first small divided electrode 81. Divide It is being done.

[0081] The first large divided electrode 71 is positioned between the first margin portion 211 and one end (left side) in the short direction S of the first dielectric film 21.

[0082] The first large divided electrode 71 is divided into a plurality of first partial electrodes 710 by at least one first short-direction slit portion 221. The first short-direction slit portion 221 is connected to one side (left side) of the short-direction S of the first dielectric film 21 and to the first margin portion 211.

[0083] Multiple first partial electrodes 710 are arranged in the longitudinal direction L. The left end of each of the multiple first partial electrodes 710 can be connected to a first end face electrode 310 (not shown in Figure 2).

[0084] On the other hand, the first small segment electrode 81 is positioned between the first margin portion 211 and the first end margin portion 241.

[0085] Here, the first end margin portion 241 is located at the other end (right side) of the short-side direction S of the first dielectric film 21. Like the first margin portion 211, the first end margin portion 241 is also a portion where the first electrode 31 is not located. 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 end margin portion 241 allows the first small segment electrode 81 and the second end face electrode 320 (not shown in Figure 2) to be separated. In this embodiment, the width of the first end margin portion 241 is the same as the width of the first margin portion 211, but it may be different within a range that does not impair the effects of this embodiment.

[0086] Furthermore, the first small divided electrode 81 is divided into a plurality of first small electrode groups 510 by at least one first short-direction slit portion 221. The first short-direction slit portion 221 is connected to the first margin portion 211 and the first end margin portion 241.

[0087] Multiple first small electrode groups 510 are arranged in the longitudinal direction L. The first small electrode groups 510 are arranged in the short direction S with respect to the first partial electrode 710.

[0088] The first small electrode group 510 includes a plurality (two in this embodiment) of first small electrodes 511. The plurality of first small electrodes 511 are arranged in the short-side direction S. In this embodiment, the shape of the first small electrodes 511 is rectangular, but is not particularly limited. Also, in this embodiment, the plurality of first small electrodes 511 are the same size, but they may be different as long as it does not impair the effects of this embodiment.

[0089] Multiple first small electrodes 511 included in each of the multiple first small electrode groups 510 are connected by a first fuse 61. The first fuse 61, like the fuse 62 in the first embodiment, is a part that melts when an excessive current flows and interrupts the circuit. The first fuse 61 connects adjacent first small electrodes 511 in the short direction S. The width of the first fuse 61 is shorter than the length L in the longitudinal direction of the first small electrodes 511.

[0090] <Second electrode> The second electrode 32 is divided by the second margin portion 212 into a second large divided electrode 72 and a second small divided electrode 82. Divide It is being done.

[0091] The second margin portion 212 is the portion on the first surface 201 of the second dielectric film 22 where the second electrode 32 is not located. Therefore, the dielectric film 2 is exposed in this portion. The second margin portion 212 extends in the longitudinal direction L with a constant width. In this embodiment, the width of the second margin portion 212 is the same as the width of the first margin portion 211, but it may differ within a range that does not impair the effects of this embodiment.

[0092] The second large divided electrode 72 is positioned between the second margin portion 212 and the other end (right side) of the second dielectric film 22 in the short direction S.

[0093] The second large divided electrode 72 is divided into a plurality of second partial electrodes 720 by the second short-direction slit portion 222. The second short-direction slit portion 222 is connected to one side (right side) of the short-direction S of the second dielectric film 22 and to the second margin portion 212.

[0094] Multiple second partial electrodes 720 are arranged in the longitudinal direction L. The right end of each of the multiple second partial electrodes 720 can be connected to a second end face electrode 320 (not shown in Figure 2).

[0095] On the other hand, the second small segment electrode 82 is positioned between the second margin portion 212 and the second end margin portion 242.

[0096] Here, the second end margin portion 242 is located at one end (left side) in the short direction S of the second dielectric film 22. The presence of the second end margin portion 242 allows the second small segment electrode 82 and the first end face electrode 310 (not shown in Figure 2) to be separated. In this embodiment, the width of the second end margin portion 242 is the same as the width of the second margin portion 212, but it may differ within a range that does not impair the effects of this embodiment.

[0097] Furthermore, the second small divided electrode 82 is divided into a plurality of second small electrode groups 520 by at least one second short-direction slit portion 222.

[0098] Multiple second small electrode groups 520 are arranged in the longitudinal direction L. The second small electrode groups 520 are arranged in the short direction S with respect to the second partial electrode 720.

[0099] The second small electrode group 520 includes a plurality (two in this embodiment) of second small electrodes 521. The plurality of second small electrodes 521 are arranged in the short-side direction S. In this embodiment, the shape of the second small electrodes 521 is rectangular, but is not particularly limited. Also, in this embodiment, the plurality of second small electrodes 521 are the same size, but they may be different as long as it does not impair the effects of this embodiment.

[0100] Multiple second small electrodes 521 contained in each of the multiple second small electrode groups 520 are connected by a second fuse 62. The second fuse 62, like the first fuse 61, is a component that melts when an excessive current flows, interrupting the circuit. The second fuse 62 connects adjacent second small electrodes 521 in the short direction S. The width of the second fuse 62 is shorter than the length L in the long direction of the second small electrodes 521.

[0101] The second electrode 32 described above faces the first electrode 31 via a dielectric film 2 (in this embodiment, the first dielectric film 21).

[0102] Specifically, the second small divided electrode 82 of the second electrode 32 faces the first large divided electrode 71 of the first electrode 31 via the dielectric film 2 (part Z1 in Figure 1). More precisely, the second small electrode 521 on the left side of the second electrode 32 faces the first partial electrode 710 of the first electrode 31 via the dielectric film 2. The first unit capacitor 10 is formed in this area.

[0103] Furthermore, the second small segment electrode 82 of the second electrode 32 faces the first small segment electrode 81 of the first electrode 31 via the dielectric film 2 (part Z2 in Figure 1). 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 via the dielectric film 2. A second unit capacitor 10 is formed in this area.

[0104] Furthermore, the second large divided electrode 72 of the second electrode 32 faces the first small divided electrode 81 of the first electrode 31 via the dielectric film 2 (part Z3 in Figure 1). More specifically, the second partial electrode 720 of the second electrode 32 faces the first small electrode 511 on the right side of the first electrode 31 via the dielectric film 2. A third unit capacitor 10 is formed in this part.

[0105] The film capacitor 1 according to this embodiment, like the first embodiment, includes a plurality of unit capacitor groups (the portion C enclosed by the dashed line in Figure 2 is one unit capacitor group). The plurality of unit capacitor groups are arranged in the longitudinal direction L. Each of the plurality of unit capacitor groups is connected to an end face electrode 30 (a first end face electrode 310 and a second end face electrode 320). In other words, the plurality of unit capacitor groups are connected in parallel. However, each unit capacitor group in this embodiment includes three unit capacitors 10 connected in series in the short direction S.

[0106] <Effects and Effects> According to this embodiment, in addition to the same effects and advantages as in the first embodiment, the following effects and advantages are also achieved.

[0107] According to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0108] In other words, the film capacitor 1 according to this embodiment includes three unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2, similar to the film capacitor 1 shown in Figure 9A. Therefore, if the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 shown in Figures 7A and 8A is the same as the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 according to this embodiment, the voltage applied to the unit capacitor 10 of the film capacitor 1 according to this embodiment will be smaller than the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in Figures 7A and 8A, thereby further suppressing damage to the dielectric film 2.

[0109] Furthermore, in the film capacitor 1 according to this embodiment, as shown in Figure 2, the multiple first small electrodes 511 are connected by a first fuse 61, and the multiple second small electrodes 521 are connected by a second fuse 62. Therefore, even if a short circuit occurs between a portion of the first electrode 31 and the second electrode 32, at least one of the first fuse 61 and the second fuse 62 will be blown.

[0110] Therefore, according to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0111] (3) Third Embodiment Next, the film capacitor 1 according to the third embodiment will be described with reference to the drawings. In the third embodiment, components similar to those in the first and second embodiments may be denoted by the same reference numerals as in the first and second embodiments, and detailed descriptions may be omitted.

[0112] As shown in Figure 3, the film capacitor 1 according to this embodiment is similar to the film capacitor 1 according to the second embodiment shown in Figure 2 in that it includes three unit capacitors 10 connected in series in the short direction S, but it differs from the film capacitor 1 according to the second embodiment in that it further has a first connection part 91 and a second connection part 92. The differences from the second embodiment will be explained below in particular.

[0113] <1st electrode> In this embodiment, the first connecting portion 91 is located at one end (left side) in the short direction S of the dielectric film 2 (first dielectric film 21). The first connecting portion 91 is located between adjacent first partial electrodes 710 in the longitudinal direction L. In this way, the multiple first partial electrodes 710 are connected by the first connecting portion 91.

[0114] The first connection portion 91 is conductive. Therefore, the first connection portion 91 may be formed as part of the first electrode 31. That is, the first connection portion 91 may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode. The material of the first connection portion 91 is not particularly limited, but examples include aluminum.

[0115] In the short-side direction S of the dielectric film 2 (first dielectric film 21), the length of the first connection portion 91 is shorter than the length of the first partial electrode 710. Therefore, between adjacent first partial electrodes 710 in the longitudinal direction L, there exists the first connection portion 91 and the first short-side slit portion 221.

[0116] <Second electrode> In this embodiment, the second connecting portion 92 is located at the other (right) end of the short-side direction S of the dielectric film 2 (second dielectric film 22). The second connecting portion 92 is located between adjacent second partial electrodes 720 in the longitudinal direction L. In this way, multiple second partial electrodes 720 are connected by the second connecting portion 92.

[0117] The second connection portion 92 is conductive, just like the first connection portion 91. Therefore, the second connection portion 92 may be formed as part of the second electrode 32. That is, the second connection portion 92 may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode, just like the first connection portion 91. The material of the second connection portion 92 is the same as the material of the first connection portion 91.

[0118] In the short-side direction S of the dielectric film 2 (second dielectric film 22), the length of the second connection portion 92 is shorter than the length of the second partial electrode 720. Therefore, between adjacent second partial electrodes 720 in the longitudinal direction L, there exists the second connection portion 92 and the second short-side slit portion 222.

[0119] The film capacitor 1 according to this embodiment also includes a plurality of unit capacitor groups, similar to the second embodiment. The plurality of unit capacitor groups are arranged in the longitudinal direction L. Each of the plurality of unit capacitor groups is connected to an end face electrode 30 (first end face electrode 310 and second end face electrode 320). In other words, the plurality of unit capacitor groups are connected in parallel. Each unit capacitor group includes three unit capacitors 10 connected in series in the short direction S. However, the plurality of unit capacitor groups in this embodiment are connected by a first connection part 91 and a second connection part 92.

[0120] <Effects and Effects> According to this embodiment, in addition to the same effects and advantages as in the first and second embodiments, the following effects and advantages are also achieved.

[0121] In this embodiment, multiple first partial electrodes are connected by a first connection portion 91, and multiple second partial electrodes are connected by a second connection portion 92. That is, multiple unit capacitor groups are connected by the first connection portion 91 and the second connection portion 92.

[0122] Therefore, the difference in capacitance between multiple unit capacitor groups can be reduced. Furthermore, the reduction in the connection area between the first large divided electrode 71 and the first end face electrode 310 can be suppressed. Furthermore, the reduction in the connection area between the second large divided electrode 72 and the second end face electrode 320 can be suppressed.

[0123] Furthermore, in this embodiment, for example, as shown in Figure 3, if dielectric breakdown occurs at point P on a certain partial electrode 710, current is less likely to flow linearly from point Q on another partial electrode 710 towards point P. That is, the current is more likely to flow through a detour from point Q through the first connection 91 to point P, thus gaining time from dielectric breakdown to through breakdown. Therefore, the risk of through breakdown can be reduced.

[0124] (4) Fourth Embodiment Next, the film capacitor 1 according to the fourth embodiment will be described with reference to the drawings. In the fourth embodiment, components similar to those in the first to third embodiments may be denoted by the same reference numerals as in the first to third embodiments, and detailed descriptions may be omitted.

[0125] The film capacitor 1 according to this embodiment is similar to the film capacitor 1 according to the second to third embodiments in that it includes three unit capacitors 10 connected in series in the short direction S, but it differs from the film capacitor 1 according to the first to third embodiments in that it may include four or more unit capacitors 10 connected in series in the short direction S.

[0126] In other words, the film capacitor 1 according to this embodiment is an extension or generalization of the number of unit capacitors 10 connected in series in the short direction S to three or more. Hereinafter, the number of unit capacitors 10 connected in series in the short direction S will be n (where n is an integer of 3 or more).

[0127] Figures 4 and 5 show an example of a film capacitor 1 when n=4. This film capacitor 1 has a dielectric film 2 through which the first large divided electrode 71 and the second small divided electrode 82 face each other (parts Z1 and Z4), and a dielectric film 2 through which the first small divided electrode 81 and the second small divided electrode 82 face each other (parts Z2 and Z3).

[0128] <Dielectric film> The dielectric film 2 in this embodiment is the same as the dielectric film 2 in the first to third embodiments.

[0129] <1st electrode> [When n is an odd number greater than or equal to 3] The first electrode 31 is divided by at least one first margin portion 211 into at least one first large divided electrode 71 and at least one first small divided electrode 81. Divide In particular, the first electrode 31 is divided into (n+1) / 2 parts. Divide For example, in the case of n=3, the first electrode 31 is divided into two. Divide (See Figure 2). For example, the first electrode 31 is divided by one first margin portion 211 into one first large divided electrode 71 and one first small divided electrode 81. Divide It will be done.

[0130] Furthermore, the first electrode 31 is connected to the first end electrode 310, but not to the second end electrode 320. To give a specific example, when n=3, the first large divided electrode 71, located on one side (left side) of the short direction S of the dielectric film 2, is connected to the first end electrode 310, but the first small divided electrode 81, located on the other side (right side) of the short direction S of the dielectric film 2, is not connected to the second end electrode 320.

[0131] [When n is an even number greater than or equal to 4] The first electrode 31 is divided by at least two first margin portions 211 into at least two first large divided electrodes 71 and at least one first small divided electrode 81. DivideIn particular, the first electrode 31 is divided into (n+2) / 2 parts. Divide For example, if n=4, the first electrode 31 is divided into three parts. Divide (See Figures 4 and 5). For example, the first electrode 31 is divided by two first margin portions 211 into two first large divided electrodes 71 and one first small divided electrode 81. Divide It will be done.

[0132] Furthermore, the first electrode 31 is connected to the first end electrode 310 and the second end electrode 320. To give a specific example, when n=4, the first large division electrode 71 located on one side (left side) of the short direction S of the dielectric film 2 is connected to the first end electrode 310, and the first large division electrode 71 located on the other side (right side) of the short direction S of the dielectric film 2 is connected to the second end electrode 320.

[0133] [When n is an integer greater than or equal to 3] The first large divided electrode 71 is preferably connected to the end face electrode 30.

[0134] The first small electrode group 510 includes a plurality (two in this embodiment) of first small electrodes 511 (see Figures 2 and 5). The plurality of first small electrodes 511 are connected by a first fuse 61.

[0135] <Second electrode> [When n is an odd number greater than or equal to 3] The second electrode 32 is divided by at least one second margin portion 212 into at least one second large divided electrode 72 and at least one second small divided electrode 82. Divide In particular, the second electrode 32 is divided into (n+1) / 2 parts. Divide For example, when n=3, the second electrode 32 is divided into two. Divide (See Figure 2). For example, the second electrode 32 is divided by a second margin portion 212 into one second large divided electrode 72 and one second small divided electrode 82. Divide It will be done.

[0136] Furthermore, the second electrode 32 is not connected to the first end face electrode 310, but it is connected to the second end face electrode 320. To give a specific example, when n=3, the second small divided electrode 82, which is located on one side (left side) of the short direction S of the dielectric film 2, is not connected to the first end face electrode 310, but the second large divided electrode 72, which is located on the other side (right side) of the short direction S of the dielectric film 2, is connected to the second end face electrode 320.

[0137] [When n is an even number greater than or equal to 4] The second electrode 32 is divided into at least two second sub-division electrodes 82 by at least one second margin portion 212. Divide In particular, the second electrode 32 is divided into n / 2 units. Divide For example, when n=4, the second electrode 32 is divided into two. Divide (See Figures 4 and 5). For example, the second electrode 32 is divided into two second small divided electrodes 82 by one second margin portion 212. Divide It will be done.

[0138] Furthermore, the second electrode 32 is not connected to the first end electrode 310 and the second end electrode 320. To give a specific example, when n=4, the second small segment electrode 82 located on one side (left side) of the short direction S of the dielectric film 2 is not connected to the first end electrode 310, and the second small segment electrode 82 located on the other side (right side) of the short direction S of the dielectric film 2 is also not connected to the second end electrode 320.

[0139] [When n is an integer greater than or equal to 3] If the second electrode 32 includes a second large divided electrode 72, it is preferable that the second large divided electrode 72 is connected to the end face electrode 30.

[0140] The second small electrode group 520 includes a plurality (two in this embodiment) of second small electrodes 521 (see Figures 2 and 5). The plurality of second small electrodes 521 are connected by a second fuse 62.

[0141] The film capacitor 1 according to this embodiment, like the first to third embodiments, includes a plurality of unit capacitor groups (the portion C enclosed by the dashed line in Figures 2 and 5 is one unit capacitor group). The plurality of unit capacitor groups are arranged in the longitudinal direction L. Each of the plurality of unit capacitor groups is connected to an end face electrode 30 (a first end face electrode 310 and a second end face electrode 320). In other words, the plurality of unit capacitor groups are connected in parallel. However, each unit capacitor group in this embodiment includes three or more unit capacitors 10 connected in series in the short direction S.

[0142] <Effects and Effects> According to this embodiment, in addition to the same effects and advantages as in the first and second embodiments, the following effects and advantages are also achieved.

[0143] In this embodiment, each unit capacitor group includes three or more unit capacitors 10 connected in series in the short direction S. The more unit capacitors 10 included in each unit capacitor group, the smaller the voltage applied to each unit capacitor 10 becomes. Therefore, damage to the dielectric film 2 is more easily suppressed.

[0144] Therefore, according to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0145] (5) Fifth embodiment Next, the film capacitor 1 according to the fifth embodiment will be described with reference to the drawings. In the fifth embodiment, components similar to those in the first to fourth embodiments may be denoted by the same reference numerals as in the first to fourth embodiments, and detailed descriptions may be omitted.

[0146] The film capacitor 1 according to this embodiment is similar to the film capacitor 1 according to the fourth embodiment in that it includes three or more unit capacitors 10 connected in series in the short direction S.

[0147] The film capacitor 1 according to this embodiment differs from the film capacitor 1 according to the fourth embodiment in that, when the number of unit capacitors 10 connected in series in the short direction S is an odd number of 3 or more, there are further first connection parts 91 and second connection parts 92 (see Figure 3).

[0148] Furthermore, the film capacitor 1 according to this embodiment differs from the film capacitor 1 according to the fourth embodiment in that, when the number of unit capacitors 10 connected in series in the short direction S is an even number of 4 or more, an additional first connection portion 91 exists (see Figure 6).

[0149] The following will focus on explaining the differences mentioned above.

[0150] <1st electrode> [When n is an odd number greater than or equal to 3] At least one of the first large division electrodes 71 is located on one side (left side) of the short-side direction S of the dielectric film 2 (first dielectric film 21). For example, when n=3, one first large division electrode 71 is located on the left side of the short-side direction S (see Figure 3). The multiple first partial electrodes 710 are connected by a first connection portion 91 located at the left end of the short-side direction S.

[0151] [When n is an even number greater than or equal to 4] At least two of the two or more first large division electrodes 71 are located on one side (left) and the other side (right) of the short-length direction S of the dielectric film 2 (first dielectric film 21). For example, when n=4, two first large division electrodes 71 are located on both the left and right sides of the short-length direction S (see Figure 6). The multiple first partial electrodes 710 of the first large division electrode 71 located on the left side of the short-length direction S are connected by a first connection portion 91 located at the left end of the dielectric film 2. The multiple first partial electrodes 710 of the first large division electrode 71 located on the right side of the short-length direction S are connected by a first connection portion 91 located at the right end of the dielectric film 2.

[0152] <Second electrode> [When n is an odd number greater than or equal to 3] At least one of the two large second division electrodes 72 is located on the other side (right side) of the short direction S of the dielectric film 2 (second dielectric film 22). For example, when n=3, one large second division electrode 72 is located on the right side of the short direction S (see Figure 3). The multiple second partial electrodes 720 are connected by a second connection portion 92 located at the right end of the short direction S.

[0153] [When n is an even number greater than or equal to 4] The second connection part 92 may not be present (see Figure 6).

[0154] [When n is an integer greater than or equal to 3] The film capacitor 1 according to this embodiment also includes a plurality of unit capacitor groups, similar to the fourth embodiment. The plurality of unit capacitor groups are arranged in the longitudinal direction L. Each of the plurality of unit capacitor groups is connected to an end face electrode 30 (first end face electrode 310 and second end face electrode 320). In other words, the plurality of unit capacitor groups are connected in parallel. Each unit capacitor group includes three or more unit capacitors 10 connected in series in the short direction S.

[0155] <Effects and Effects> According to this embodiment, in addition to the same effects and advantages as in the fourth embodiment, the following effects and advantages are also achieved.

[0156] In this embodiment, when the number of unit capacitors 10 connected in series in the short direction S is an odd number of three or more, the multiple groups of unit capacitors are connected by the first connection part 91 and the second connection part 92 (see Figure 3).

[0157] In this embodiment, if the number of unit capacitors 10 connected in series in the short direction S is an even number of four or more, the multiple groups of unit capacitors are connected by the first connection part 91 (see Figure 6).

[0158] Therefore, the difference in capacitance between multiple unit capacitor groups can be reduced. Furthermore, the reduction in the connection area between the first large divided electrode 71 and the first end face electrode 310 can be suppressed. Furthermore, the reduction in the connection area between the second large divided electrode 72 and the second end face electrode 320 can be suppressed.

[0159] Furthermore, in this embodiment, as in the third embodiment, it is possible to gain time from dielectric breakdown to through-breakdown. Therefore, the risk of through-breakdown can be reduced. [Explanation of symbols]

[0160] 1 Film Capacitor 10 Unit Capacitors 2 Dielectric film 201 Page 1 202 2nd page 211 First Margin Section 212 Second Margin Section 221 First short-direction slit section 222 Second short-direction slit section 242 Second end margin (end margin) 31 1st electrode 32 2nd electrode 510 1st small electrode group 511 1st small electrode 520 2nd small electrode group (small electrode group) 521 2nd small electrode (small electrode) 61 First Fuse 62. Second Fuse (Fuse) 7 large divided electrodes 71 1st large divided electrode 710 1st partial electrode (partial electrode) 72 Second large divided electrode 720 Second partial electrode 8 subdivided electrodes 81 1st subdivided electrode 82 2nd subdivided electrode 91 First connection section 92 Second connection section S (Short direction) L Longitudinal direction

Claims

1. 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 short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three unit capacitors connected in series in the short direction. The first electrode is divided into a first large divided electrode and a first small divided electrode by the first margin portion extending in the longitudinal direction. The first large divided electrode is divided into a plurality of first partial electrodes arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, The first small divided electrode is divided by the first short-direction slit portion into a plurality of first small electrode groups arranged in the longitudinal direction, The second electrode is divided into a second large divided electrode and a second small divided electrode by the second margin portion extending in the longitudinal direction. The second large divided electrode is divided into a plurality of second partial electrodes arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, The second small divided electrode is divided by the second short-direction slit portion into a plurality of second small electrode groups arranged in the longitudinal direction, The plurality of first partial electrodes are connected at a first connecting portion located at one end in the short direction. Between the first partial electrodes adjacent in the longitudinal direction, there is a first connecting portion and a first slit portion in the short direction. In the aforementioned short-side direction, the length of the first connection portion is shorter than the length of the first short-side slit portion located between adjacent first partial electrodes in the aforementioned longitudinal direction. Film capacitor.

2. The plurality of second partial electrodes are connected at a second connecting portion located at the other end in the short direction, Between the second partial electrodes adjacent in the longitudinal direction, there is a second connecting portion and a second slit portion in the short direction. In the aforementioned short-side direction, the length of the second connection portion is shorter than the length of the second short-side slit portion located between adjacent second partial electrodes in the longitudinal direction. The film capacitor according to claim 1.

3. The first group of small electrodes includes a plurality of first small electrodes connected by a first fuse, The second group of small electrodes includes a plurality of second small electrodes connected by a second fuse. A film capacitor according to claim 1 or 2.

4. 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 short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three or more odd-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first large divided electrode and at least one first small divided electrode. The first large divided electrode is divided into a plurality of first partial electrodes arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, The first small divided electrode is divided by the first short-direction slit portion into a plurality of first small electrode groups arranged in the longitudinal direction, The second electrode is divided by at least one second margin portion extending in the longitudinal direction into at least one second large divided electrode and at least one second small divided electrode. The second large divided electrode is divided into a plurality of second partial electrodes arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, The second small divided electrode is divided by the second short-direction slit portion into a plurality of second small electrode groups arranged in the longitudinal direction, One of the at least one first large division electrode is located on one side in the short direction. The multiple first partial electrodes in the one first large divided electrode are connected at a first connecting portion located at one end in the short direction. Between the first partial electrodes adjacent in the longitudinal direction, there is a first connecting portion and a first slit portion in the short direction. In the aforementioned short-side direction, the length of the first connection portion is shorter than the length of the first short-side slit portion located between adjacent first partial electrodes in the aforementioned longitudinal direction. Film capacitor.

5. One of the at least one second large division electrode is located on the other side in the short direction, The multiple second partial electrodes in the aforementioned one second large divided electrode are connected at a second connecting portion located at the other end in the short direction. Between the second partial electrodes adjacent in the longitudinal direction, there is a second connecting portion and a second slit portion in the short direction. In the aforementioned short-side direction, the length of the second connection portion is shorter than the length of the second short-side slit portion located between adjacent second partial electrodes in the longitudinal direction. The film capacitor according to claim 4.

6. 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 short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including four or more even-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least two first margin portions extending in the longitudinal direction into at least two first large divided electrodes and at least one first small divided electrode. The first large divided electrode is divided into a plurality of first partial electrodes arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, The first small divided electrode is divided by the first short-direction slit portion into a plurality of first small electrode groups arranged in the longitudinal direction, The second electrode is divided into at least two or more second sub-division electrodes by at least one or more second margin portions extending in the longitudinal direction. The second small divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Two of the at least two first large division electrodes are located on one side and the other side in the short direction. The multiple first partial electrodes in the two first large divided electrodes are connected by first connecting portions located at one end and the other end in the short direction. Between the first partial electrodes adjacent in the longitudinal direction, there is a first connecting portion and a first slit portion in the short direction. In the aforementioned short-side direction, the length of the first connection portion is shorter than the length of the first short-side slit portion located between adjacent first partial electrodes in the aforementioned longitudinal direction. Film capacitor.

7. The first group of small electrodes includes a plurality of first small electrodes connected by a first fuse, The second group of small electrodes includes a plurality of second small electrodes connected by a second fuse. A film capacitor according to any one of claims 4 to 6.

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