JP2024040910A - Film capacitor and method for manufacturing the same - Google Patents

Abstract

To provide a film capacitor capable of easily discharging hydrogen to the outside of a capacitor element main body even when generating the hydrogen in the inside of the capacitor element main body.SOLUTION: A film capacitor 1 includes: a capacitor element main body 2 having a first end surface 21 and a second end surface 22 on the side opposite to the first end surface 21; a hydrogen permeable film 31 arranged on a part of the first end surface 21; a first end surface electrode 41 arranged on the remainder of the first end surface 21; and a second end surface electrode 42 arranged on the second end surface 22. The capacitor element main body 2 includes: a first electrode 51 connected to the first end surface electrode 41 and not connected to the second end surface electrode 42; a second electrode 52 connected to the second end surface electrode 42 and not connected to the first end surface electrode 41; and a dielectric film 6 intervening between the first and second electrodes 51 and 52.SELECTED DRAWING: Figure 1

Description

The present disclosure generally relates to a film capacitor and a method of manufacturing the same, and more particularly relates to a film capacitor using a dielectric film and a method of manufacturing the same.

Patent Document 1 discloses an aluminum electrolytic capacitor. This aluminum electrolytic capacitor consists of a capacitor element impregnated with a driving electrolyte, a bottomed cylindrical metal case containing the capacitor element, a pair of lead wires led out from the capacitor element, and a pair of lead wires connected to each other. The metal case includes a pair of external connection terminals and a sealing member that seals the opening of the metal case.

Japanese Patent Application Publication No. 04-091421

When an overvoltage higher than the rated voltage is applied to the aluminum electrolytic capacitor of Patent Document 1, the organic solvent constituting the driving electrolyte impregnated into the capacitor element vaporizes due to the temperature rise, and hydrogen gas is generated due to an electrochemical reaction. As a result, the internal pressure of the metal case increases.

However, in the aluminum electrolytic capacitor of Patent Document 1, a structure for lowering the internal pressure of the metal case is adopted. That is, a perforated plate is installed above the explosion-proof valve provided on the ceiling of the metal case with a space therebetween. Furthermore, a separation membrane that does not allow organic solvents such as ethylene glycol to pass through, but allows hydrogen gas to pass through, is arranged outside the porous plate.

Therefore, even if abnormal stress such as overvoltage is applied to the aluminum electrolytic capacitor of Patent Document 1, hydrogen gas is released to the outside due to the presence of the separation membrane, and the internal pressure of the metal case decreases.

By the way, compared to aluminum electrolytic capacitors, film capacitors are superior in terms of frequency characteristics (low ESR), withstand voltage, lifespan, and temperature characteristics.

However, while proceeding with the development of film capacitors, the present inventor discovered that, like aluminum electrolytic capacitors, there is a possibility that hydrogen may be generated inside the capacitor element body of the film capacitor. Since a driving electrolyte is not used in film capacitors, the mechanism of hydrogen generation is not clear, but the inventor has discovered that the dielectric film inside the capacitor element becomes heated due to the heat generated when the film capacitor is used. It is assumed that hydrogen will be generated by decomposition.

Therefore, the present inventor investigated whether the technology described in Patent Document 1 could be applied to film capacitors, but since film capacitors have a different structure from aluminum electrolytic capacitors, the technology described in Patent Document 1 can be applied as is. It is difficult to apply to film capacitors.

An object of the present disclosure is to provide a film capacitor and a method for manufacturing the same that can easily release hydrogen to the outside of the capacitor element body even if hydrogen is generated inside the capacitor element body.

A film capacitor according to one aspect of the present disclosure includes: a capacitor element main body having a first end surface and a second end surface opposite to the first end surface; a hydrogen permeable membrane disposed on a part of the first end surface; A first end surface electrode is provided on the remaining portion of the first end surface, and a second end surface electrode is provided on the second end surface. The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.

A film capacitor according to one aspect of the present disclosure includes: a capacitor element main body having a first end surface and a second end surface opposite to the first end surface; a hydrogen permeable membrane disposed on a part of the first end surface; a cylindrical body whose one end is closed by the hydrogen permeable membrane and whose other end is open; a first end surface electrode disposed on the remainder of the first end surface; and a second end surface disposed on the second end surface. The capacitor element includes an electrode, and a sealing part that seals the capacitor element body, the first end electrode, and the second end electrode. The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.

A method for manufacturing a film capacitor according to one embodiment of the present disclosure includes a preparation step, a placement step, an end electrode formation step, and a sealing step. In the preparation step, a capacitor element main body having a first end surface and a second end surface opposite to the first end surface, a hydrogen permeable membrane, one end of which is closed by the hydrogen permeable membrane, and the other end of which is closed by the hydrogen permeable membrane. A hydrogen permeable component having an open cylindrical body is prepared. In the placement step, the hydrogen permeable membrane of the hydrogen permeable component is placed on a part of the first end surface of the capacitor element body. In the end face electrode forming step, a first end face electrode is formed on the remainder of the first end face of the capacitor element body, and a second end face electrode is formed on the second end face of the capacitor element body. In the sealing step, the capacitor element main body, the first end surface electrode, and the second end surface electrode are sealed so as not to block the other end of the cylindrical body.

A film capacitor according to one aspect of the present disclosure includes a capacitor element main body having a first end surface and a second end surface opposite to the first end surface, a first end surface electrode disposed on the first end surface, and a first end surface electrode disposed on the first end surface. a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a capacitor element body, a sealing capacitor element body, a capacitor element body, a capacitor element body, a sealing capacitor element body; and a hydrogen permeable membrane that closes the bottomed hole. The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.

A film capacitor according to one aspect of the present disclosure includes a capacitor element main body having a first end surface and a second end surface opposite to the first end surface, a first end surface electrode disposed on the first end surface, and a first end surface electrode disposed on the first end surface. a second end electrode disposed on two end surfaces, a cylindrical body whose one end is closed by the first end electrode and whose other end is open, a hydrogen permeable membrane that closes the cylindrical body, and the capacitor element. The device includes a main body, a sealing portion that seals the first end electrode, and the second end electrode. The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.

A method for manufacturing a film capacitor according to one embodiment of the present disclosure includes a preparation step, an end electrode formation step, a placement step, and a sealing step. In the preparation step, a capacitor element main body having a first end surface and a second end surface opposite to the first end surface, a hydrogen permeable membrane, and a space between one end and the other end are closed by the hydrogen permeable membrane. A hydrogen permeable component having a cylindrical body and a cylindrical body is prepared. In the end face electrode forming step, a first end face electrode is formed on the first end face of the capacitor element body, and a second end face electrode is formed on the second end face of the capacitor element body. In the placement step, one end of the hydrogen permeable component is placed on a portion of the first end electrode of the capacitor element body. In the sealing step, the capacitor element main body, the first end surface electrode, and the second end surface electrode are sealed so as not to block the other end of the cylindrical body.

According to the present disclosure, even if hydrogen is generated inside the capacitor element body, this hydrogen can be easily released to the outside of the capacitor element body.

FIG. 1 is a schematic cross-sectional view showing a film capacitor according to a first embodiment. FIG. 2A is a schematic perspective view showing the manufacturing process of the above film capacitor. FIG. 2B is a schematic perspective view showing the same film capacitor as above. FIG. 3 is a schematic cross-sectional view showing a film capacitor according to a second embodiment. FIG. 4 is a schematic cross-sectional view showing a film capacitor according to a third embodiment. 5A to 5C are schematic cross-sectional views showing the manufacturing process of the above film capacitor. FIG. 6 is a schematic cross-sectional view showing a film capacitor according to a fourth embodiment. FIG. 7 is a schematic cross-sectional view showing a film capacitor according to a fifth embodiment. 8A to 8C are schematic cross-sectional views showing the manufacturing process of the above film capacitor. FIG. 9A is a schematic perspective view showing a hydrogen permeable component used in manufacturing a film capacitor according to a third embodiment. FIG. 9B is a schematic perspective view showing a hydrogen permeable component used for manufacturing a film capacitor according to a fifth embodiment.

1. First Embodiment A film capacitor 1 according to a first embodiment will be described below with reference to FIGS. 1, 2A, and 2B. Each figure is a schematic diagram, and the respective ratios of sizes and thicknesses of each component in each figure do not necessarily reflect actual dimensional ratios. The arrows indicating each direction in each figure are not intended to define the direction in use of the film capacitor 1, but are merely shown to make the explanation easier to understand, and have no substance. Note that the X-axis, Y-axis, and Z-axis are orthogonal to each other. Hereinafter, viewing along the Y axis will be referred to as ZX plane viewing. Further, the longitudinal direction L and the transverse direction (width direction) S are orthogonal (see FIG. 2A).

As shown in FIG. 1, the film capacitor 1 according to the first embodiment includes a capacitor element main body 2, a hydrogen permeable membrane 31, a first end surface electrode 41, and a second end surface electrode 42. Each component will be explained in order below.

<Capacitor element body>
As shown in FIG. 2B, the capacitor element main body 2 is a solid body that has a rounded rectangular shape in a ZX plane view and extends in the Y-axis direction. Note that the shape of the capacitor element main body 2 is not particularly limited. Examples of the shape of the capacitor element main body 2 include a cylinder, a prism, and a rectangular parallelepiped.

The capacitor element main body 2 has a first end surface 21 and a second end surface 22. The first end surface 21 is a surface facing in the positive direction of the Y-axis. The second end surface 22 is a surface opposite to the first end surface 21. That is, the second end surface 22 is a surface facing in the negative direction of the Y-axis. In the first embodiment, the first end surface 21 and the second end surface 22 are parallel. In addition, although each of the first end surface 21 and the second end surface 22 is illustrated as an uneven surface in FIG. 1, it may be a flat surface.

The capacitor element main body 2 includes a first electrode 51, a second electrode 52, and a dielectric film 6.

Each of the first electrode 51 and the second electrode 52 contains at least one metal selected from the group consisting of Al (aluminum), Zn (zinc), and Mg (magnesium). The thickness of each of the first electrode 51 and the second electrode 52 is not particularly limited, but is, for example, 5 nm or more and 100 nm or less.

The material of the dielectric film 6 is not particularly limited, and examples thereof include PP (polypropylene), PET (polyethylene terephthalate), PS (polystyrene), and PE (polyethylene). The thickness of the dielectric film 6 is determined by considering the balance between the capacitance of the film capacitor 1 and suppression of dielectric breakdown, and is not particularly limited, but is, for example, 1.0 μm or more and 10.0 μm or less. be.

The dielectric film 6 is interposed between the first electrode 51 and the second electrode 52, as shown in FIG. Note that in the first embodiment, the dielectric film 6 includes a first dielectric film 61 and a second dielectric film 62 (see FIG. 2A). Note that in FIG. 2A, the first electrode 51 and the second electrode 52 are illustrated in a dot pattern.

As shown in FIG. 2A, the capacitor element main body 2 is formed using a first metallized film 610 and a second metallized film 620 that have a constant width in the transverse direction S and extend in the longitudinal direction L.

The first metallized film 610 includes a first dielectric film 61 and a first electrode 51 . The first dielectric film 61 is a strip-shaped film that has a constant width in the transverse direction S and extends in the longitudinal direction L. The first electrode 51 is formed in a solid shape on one side of the first dielectric film 61 except for the first margin portion 601 . In this way, the first electrode 51 is not formed in the first margin portion 601, and the first dielectric film 61 is exposed. The first margin portion 601 is a narrow strip-shaped portion extending in the longitudinal direction L on one side S1 in the transverse direction S. In this way, the width of the first electrode 51 is shorter than the width of the first dielectric film 61.

On the other hand, the second metallized film 620 includes a second dielectric film 62 and a second electrode 52 . The second dielectric film 62 is a strip-shaped film that has the same width as the first dielectric film 61 and extends in the longitudinal direction L. The second electrode 52 is formed in a solid shape on one side of the second dielectric film 62 except for the second margin portion 602 . In this way, the second electrode 52 is not formed in the second margin portion 602, and the second dielectric film 62 is exposed. The second margin portion 602 is a narrow strip-shaped portion extending in the longitudinal direction L on the other side S2 in the transverse direction S. In this way, the width of the second electrode 52 is shorter than the width of the second dielectric film 62.

Then, the first metallized film 610 and the second metallized film 620 are overlapped, and the overlapped first metallized film 610 and second metallized film 620 are wound around the axis C parallel to the transverse direction S. Turn. Thereby, a cylindrical capacitor element body 2 extending in the direction of the axis C is obtained.

When the first metallized film 610 and the second metallized film 620 are stacked, both ends of the first metallized film 610 and the second metallized film 620 in the transverse direction S are substantially aligned. Further, the first electrode 51 and the second electrode 52 are opposed to each other with the dielectric film 6 interposed therebetween. Further, the first electrode 51 is arranged on the other side S2 in the lateral direction S, and the first margin portion 601 is arranged on the one side S1 in the lateral direction S. Further, the second electrode 52 is arranged on one side S1 in the lateral direction S, and the second margin portion 602 is arranged on the other side S2 in the lateral direction S.

Although the capacitor element main body 2 shown in FIG. 2A can be used as it is for manufacturing the film capacitor 1, in the first embodiment, the capacitor element main body 2 shown in FIG. By applying pressure to flatten the capacitor element body 2 shown in FIG. 2B, the capacitor element body 2 is obtained.

At the first end surface 21 of the capacitor element main body 2, the first electrode 51 is exposed. However, the second electrode 52 is not exposed on the first end surface 21 of the capacitor element main body 2.

On the other hand, on the second end surface 22 of the capacitor element main body 2, the second electrode 52 is exposed. However, the first electrode 51 is not exposed on the second end surface 22 of the capacitor element main body 2.

Note that the dielectric film 6 is exposed on the outer surface of the capacitor element main body 2 (the surface excluding the first end surface 21 and the second end surface 22 among the outer surfaces). The outer surface of the capacitor element body 2 may be covered with an electrically insulating member other than the dielectric film 6.

<Hydrogen permeable membrane>
The hydrogen permeable membrane 31 is a membrane that selectively permeates hydrogen. When the hydrogen permeable membrane 31 exists between the primary side where the hydrogen partial pressure is high and the secondary side where the hydrogen partial pressure is low, the hydrogen permeable membrane 31 selectively transfers hydrogen from the primary side to the secondary side. Transmit. Preferably, the hydrogen permeable membrane 31 is a membrane that does not allow water vapor to pass through or hardly allows water vapor to pass therethrough.

Examples of the hydrogen permeable membrane 31 include, but are not limited to, a Pd (palladium) membrane, a Pd alloy membrane, a pure iron (α iron (ferrite)) membrane, a composite membrane, and the like. All of these membranes are membranes that do not allow or hardly allow water vapor to pass therethrough.

The Pd alloy film contains Pd, and further contains Au (gold), Ag (silver), Cu (copper), Pt (platinum), Rh (rhodium), Ru (ruthenium), Ir (iridium), Ce (cerium), At least one member selected from the group consisting of Sm (samarium), Tb (terbium), Dy (dysprosium), Ho (holmium), Er (erbium), Yb (ytterbium), Y (yttrium), and Gd (gadolinium) Contains metals.

The composite membrane has a porous base material and a metal.

The porous base material in the composite membrane is a base material having many fine pores. Examples of the porous base material include woven fabrics and nonwoven fabrics. Examples of the fibers contained in each of the woven fabric and nonwoven fabric include inorganic fibers and organic fibers. Examples of the inorganic fiber include glass fiber. Examples of organic fibers include aramid fibers.

The metal in the composite membrane fills the pores of a porous substrate. Examples of the metal include the above-mentioned Pd, Pd alloy, and pure iron.

As shown in FIG. 2B, the hydrogen permeable membrane 31 has a square shape when viewed from the ZX plane. Note that the shape of the hydrogen permeable membrane 31 in the ZX plane view is not particularly limited. Examples of the shape of the hydrogen permeable membrane 31 in the ZX plane view include a circle, an ellipse, and a polygon. The thickness of the hydrogen permeable membrane 31 (thickness in the Y-axis direction) is not particularly limited, but is, for example, 10 μm or more and 500 μm or less.

The hydrogen permeable membrane 31 is arranged on a part of the first end surface 21 . Specifically, in the ZX plane view, the hydrogen permeable membrane 31 is arranged inside the outer periphery of the first end surface 21 .

The hydrogen permeable membrane 31 is in contact with the first end surface 21 . The surface of the hydrogen permeable membrane 31 facing in the negative direction of the Y-axis is the primary side surface 31a. The surface of the hydrogen permeable membrane 31 facing in the positive direction of the Y-axis is the secondary side surface 31b. Hydrogen permeates from the primary side surface 31a of the hydrogen permeable membrane 31 toward the secondary side surface 31b.

<First end electrode>
The first end electrode 41 contains Zn and/or Sn (tin). A layer made of Sn is less permeable to hydrogen than a layer made of Zn of the same thickness. In the first embodiment, the first end electrode 41 preferably contains Sn.

The first end electrode 41 has an outer portion 41a and an inner portion 41b. The outer portion 41a and the inner portion 41b are integrated. As shown in FIG. 2B, in the ZX plane view, the inner portion 41b is a portion surrounded by the outer portion 41a. The surfaces of each of the outer portion 41a and the inner portion 41b facing the positive direction of the Y-axis are flush with each other.

The first end surface electrode 41 (the outer portion 41 a in the first embodiment) is arranged on the remaining portion of the first end surface 21 . Here, the remaining portion of the first end surface 21 refers to a portion of the first end surface 21 where the hydrogen permeable membrane 31 is not disposed. As described above, in the ZX plane view, the hydrogen permeable membrane 31 is arranged inside the outer periphery of the first end surface 21, so the outer portion 41a is located between the outer periphery of the hydrogen permeable membrane 31 and the outer periphery of the first end surface 21. is located between.

The inner portion 41b is arranged inside the outer periphery of the hydrogen permeable membrane 31 in the ZX plane view. That is, in the ZX plane view, the boundary between the outer portion 41a and the inner portion 41b coincides with the outer periphery of the hydrogen permeable membrane 31. In the first embodiment, since the hydrogen permeable membrane 31 has a square shape in the ZX plane view, the boundary between the outer portion 41a and the inner portion 41b also has a square shape.

The inner portion 41b has a bottomed hole 71. The bottomed hole 71 has the hydrogen permeable membrane 31 as its bottom. The inner bottom surface of the bottomed hole 71 is the secondary side surface 31b of the hydrogen permeable membrane 31. The bottomed hole 71 is open in the positive direction of the Y-axis. The bottomed hole 71 has a circular shape in the ZX plane view, as shown in FIG. 2B. The shape of the bottomed hole 71 in the ZX plane view is not particularly limited. Examples of the shape of the bottomed hole 71 in the ZX plane view include an ellipse, a polygon, and the like. In the ZX plane view, the size of the bottomed hole 71 (inner diameter if circular, maximum length across if non-circular) is not particularly limited.

The first end surface electrode 41 (the outer portion 41 a in the first embodiment) is in contact with the first end surface 21 . As described above, the first electrode 51 is exposed on the first end surface 21. Therefore, the first end surface electrode 41 is connected to the first electrode 51. Note that since the second electrode 52 is not exposed on the first end surface 21, the first end surface electrode 41 is not connected to the second electrode 52.

The thickness (thickness in the Y-axis direction) of the first end surface electrode 41 (outer portion 41a) is not particularly limited, but is, for example, 0.5 mm or more and 1.5 mm or less.

<Second end electrode>
The second end electrode 42, like the first end electrode 41, contains Zn and/or Sn. As in the case of the first end surface electrode 41, it is preferable that the second end surface electrode 42 also contains Sn.

The second end surface electrode 42 is arranged on the second end surface 22 (the entire second end surface 22 in the first embodiment).

The second end surface electrode 42 is in contact with the second end surface 22. As described above, the second electrode 52 is exposed on the second end surface 22. Therefore, the second end electrode 42 is connected to the second electrode 52. Note that since the first electrode 51 is not exposed on the second end surface 22, the second end surface electrode 42 is not connected to the first electrode 51.

The thickness of the second end face electrode 42 (thickness in the Y-axis direction) is not particularly limited, but is, for example, 0.5 mm or more and 1.5 mm or less. The thickness of the second end surface electrode 42 may be the same as the thickness of the first end surface electrode 41, or may be different.

<Effect>
In the first embodiment, the film capacitor 1 can be charged by applying a voltage between the first end electrode 41 and the second end electrode 42 . Further, after charging, the film capacitor 1 can be discharged through the first end electrode 41 and the second end electrode 42 .

When using the film capacitor 1 as described above, hydrogen may be generated inside the capacitor element body 2 due to some cause (for example, thermal decomposition of the dielectric film 6, etc.). When hydrogen is generated inside the capacitor element body 2, the hydrogen partial pressure inside the capacitor element body 2 can become higher than the hydrogen partial pressure outside the capacitor element body 2. Therefore, hydrogen generated inside the capacitor element main body 2 passes through the hydrogen permeable membrane 31 in the following manner and is released to the outside of the capacitor element main body 2 and, ultimately, to the outside of the film capacitor 1.

The hydrogen permeation process in the hydrogen permeable membrane 31 is as follows. First, hydrogen molecules are adsorbed on the primary side surface 31a of the hydrogen permeable membrane 31 and dissociated into hydrogen atoms. Next, hydrogen atoms diffuse into the hydrogen permeable film 31 (for example, into the Pd metal lattice). Next, on the secondary side surface 31b of the hydrogen permeable membrane 31, hydrogen atoms recombine with each other to generate hydrogen molecules. Thereafter, hydrogen molecules are desorbed from the secondary side surface 31b and are released to the outside of the film capacitor 1 through the bottomed hole 71. Note that hydrogen is more difficult to permeate through the first end electrode 41 , the second end electrode 42 , and the outer surface of the capacitor element body 2 than through the hydrogen permeable membrane 31 .

Therefore, according to the first embodiment, even if hydrogen is generated inside the capacitor element main body 2, this hydrogen can be easily released to the outside of the capacitor element main body 2 through the hydrogen permeable membrane 31.

Furthermore, since the first end electrode 41 and the second end electrode 42 contain Sn, which is relatively difficult for hydrogen to permeate, when hydrogen is generated inside the capacitor element body 2, this hydrogen is further concentrated in the hydrogen permeable membrane 31. can be done.

Further, when the hydrogen permeable membrane 31 has conductivity, the hydrogen permeable membrane 31 can function as a part of the first end face electrode 41.

Further, in the first embodiment, a part of the first end face electrode 41 (here, the inner part 41b) rides on the outer peripheral part of the hydrogen permeable membrane 31. Therefore, even if the adhesive force between the hydrogen permeable membrane 31 and the first end face 21 is weaker than the adhesive force between the first end face electrode 41 (particularly the outer portion 41a) and the first end face 21, the hydrogen permeable membrane 31 Peeling from the first end surface 21 is suppressed. Further, even if the hydrogen permeable membrane 31 is pushed in the positive direction of the Y-axis by hydrogen generated inside the capacitor element main body 2, separation of the hydrogen permeable membrane 31 from the first end surface 21 is suppressed.

2. Second Embodiment Next, a film capacitor 1 according to a second embodiment will be described with reference to FIG. 3.

In the second embodiment, components similar to those in the first embodiment may be given the same reference numerals as those in the first embodiment, and detailed description thereof may be omitted.

The second embodiment differs from the first embodiment in that the film capacitor 1 further includes a sealing section 7, a bus bar 8, and a case 9. Each component will be explained in order below.

<Sealing part>
The sealing portion 7 seals the capacitor element body 2, the first end electrode 41, and the second end electrode 42 (see FIG. 3). That is, the capacitor element main body 2 , the first end surface electrode 41 , and the second end surface electrode 42 are buried inside the sealing portion 7 .

The sealing portion 7 is made of a material that is difficult to transmit hydrogen and water vapor. In the second embodiment, the sealing portion 7 is formed of a cured resin. Examples of the resin include, but are not particularly limited to, thermosetting resins such as epoxy resins.

The sealing portion 7 has a bottomed hole 71 . In this way, the sealing portion 7 shares the bottomed hole 71 with the first end electrode 41 .

<Busbar>
The bus bar 8 is a plate-shaped conductive member. The material of the bus bar 8 is not particularly limited. Bus bar 8 includes, for example, Cu and/or Al.

In the second embodiment, the busbar 8 includes a first busbar 81 and a second busbar 82.

The first bus bar 81 is connected to the first end electrode 41 . The first bus bar 81 is not connected to the second end surface electrode 42. The first bus bar 81 projects from the first end electrode 41 to the outside of the sealing portion 7 through the inside of the sealing portion 7 . The first bus bar 81 protrudes in the positive direction of the Y-axis.

On the other hand, the second bus bar 82 is connected to the second end surface electrode 42. The second bus bar 82 is not connected to the first end surface electrode 41. The second bus bar 82 projects from the second end electrode 42 to the outside of the sealing portion 7 through the inside of the sealing portion 7 . The second bus bar 82 protrudes in the same direction as the first bus bar 81.

<Case>
The case 9 is open in the positive direction of the Y-axis. The case 9 houses the sealing portion 7 in which the capacitor element body 2, the first end electrode 41, and the second end electrode 42 are sealed. The case 9 and the sealing part 7 are adhered without any gap. The shape of the case 9 is not particularly limited.

The material of the case 9 is not particularly limited, and examples thereof include PPS (polyphenylene sulfide).

<Effect>
In the second embodiment, the film capacitor 1 can be charged by applying a voltage between the first bus bar 81 and the second bus bar 82. Further, after charging, the film capacitor 1 can be discharged through the first bus bar 81 and the second bus bar 82.

In the second embodiment, as in the first embodiment, even if hydrogen is generated inside the capacitor element body 2 for some reason when using the film capacitor 1, this hydrogen is removed by the hydrogen permeable membrane. 31, it is possible to facilitate discharge to the outside of the capacitor element main body 2.

Further, in the second embodiment, the capacitor element body 2, the first end electrode 41, and the second end electrode 42 are sealed by the sealing portion 7. Therefore, the sealing portion 7 can prevent water vapor from entering the capacitor element body 2 from the outside of the film capacitor 1 .

3. Third Embodiment Next, a film capacitor 1 and a manufacturing method thereof according to a third embodiment will be described with reference to FIG. 4, FIG. 5A to FIG. 5C, and FIG. 9A.

In the third embodiment, the same components as 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 third embodiment differs from the second embodiment in that the film capacitor 1 includes a cylindrical body 32.

(1) Film capacitor The film capacitor 1 according to the third embodiment includes a capacitor element main body 2, a hydrogen permeable membrane 31, a cylindrical body 32, a first end surface electrode 41, a second end surface electrode 42, and a sealed The device includes a section 7, a bus bar 8, and a case 9. Each component will be explained in order below.

<Capacitor element body>
The capacitor element main body 2 of the third embodiment is similar to the capacitor element main body 2 of the first and second embodiments.

<Hydrogen permeable membrane>
The hydrogen permeable membrane 31 of the third embodiment is similar to the hydrogen permeable membrane 31 of the first and second embodiments.

<Cylindrical body>
The cylindrical body 32 is a member extending in the Y-axis direction (see FIG. 4). One end (the end in the negative direction of the Y-axis) of the cylindrical body 32 is closed with a hydrogen permeable membrane 31. The other end of the cylindrical body 32 (the end in the positive direction of the Y-axis) is open. In the third embodiment, a bottomed hole 71 is formed by the cylindrical body 32 and the hydrogen permeable membrane 31.

In the third embodiment, the shape of the outer circumference and inner circumference of the cylindrical body 32 is circular in the ZX plane view (see FIG. 9A), but is not particularly limited. That is, in the ZX plane view, examples of the shape of the outer periphery and inner periphery of the cylindrical body 32 include an ellipse, a polygon, and the like. The shapes of the outer circumference and inner circumference of the cylindrical body 32 in the ZX plane view may be the same or different.

Although the material of the cylindrical body 32 is not particularly limited, examples thereof include PPS (polyphenylene sulfide) and the like. The material of the cylindrical body 32 may be the same as or different from the material of the sealing part 7.

<First end electrode>
In the second embodiment described above, the first end surface electrode 41 (inner portion 41b) forms a part of the inner surface (the inner surface excluding the bottom surface) of the bottomed hole 71 (see FIG. 3). In the third embodiment, the inner surface of the cylindrical body 32 forms the entire inner surface of the bottomed hole 71 (see FIG. 4). Therefore, in the third embodiment, the first end electrode 41 (inner portion 41b) is not exposed on the inner surface of the bottomed hole 71.

In the ZX plane view, the first end surface electrode 41 (inner portion 41b) is in close contact with the outer periphery of the cylindrical body 32.

<Second end electrode>
The second end electrode 42 of the third embodiment is similar to the second end electrode 42 of the first and second embodiments.

<Sealing part>
In the second embodiment described above, the sealing portion 7 forms the inner surface of the bottomed hole 71 together with the first end electrode 41 (inner portion 41b) (see FIG. 3). In the third embodiment, the inner surface of the cylindrical body 32 forms the entire inner surface of the bottomed hole 71 (see FIG. 4).

The surface of the sealing portion 7 facing the positive direction of the Y-axis is flush with the other end of the cylindrical body 32 (the end facing the positive direction of the Y-axis). As long as the inside of the cylindrical body 32 is not closed, the surface of the sealing portion 7 facing the positive direction of the Y-axis does not need to be flush with the other end of the cylindrical body 32 .

In the ZX plane view, the sealing portion 7 is in close contact with the outer periphery of the cylindrical body 32.

<Busbar>
The bus bar 8 of the third embodiment is similar to the bus bar 8 of the second embodiment.

<Case>
Case 9 of the third embodiment is similar to case 9 of the second embodiment.

<Effect>
Also in the third embodiment, the film capacitor 1 can be used as in the second embodiment. In the third embodiment, as in the first and second embodiments, even if hydrogen is generated inside the capacitor element body 2 for some reason when using the film capacitor 1, this hydrogen can be easily discharged to the outside of the capacitor element main body 2 by the hydrogen permeable membrane 31.

Further, in the third embodiment as well, the capacitor element main body 2, the first end surface electrode 41, and the second end surface electrode 42 are sealed by the sealing portion 7, as in the case of the second embodiment. Therefore, the sealing portion 7 can prevent water vapor from entering the capacitor element main body 2 from the outside of the film capacitor 1 .

Furthermore, in the third embodiment, the inner surface of the cylindrical body 32 forms the entire inner surface of the bottomed hole 71. Therefore, the first end electrode 41 (inner portion 41b) is not exposed on the inner surface of the bottomed hole 71. Therefore, oxidation of the first end electrode 41 can be suppressed. From another perspective, since the first end electrode 41, the second end electrode 42, and the dielectric film 6 are not in direct contact with the outside air, there is no need to take water vapor permeability into account, and the first There is more room for selection regarding the materials of the end face electrode 41, the second end face electrode 42, and the dielectric film 6.

(2) Method for manufacturing a film capacitor The method for manufacturing the film capacitor 1 according to the third embodiment includes a preparation step, a placement step, an end electrode formation step, and a sealing step. Each step will be explained in order below.

<Preparation process>
In the preparation step, the above-described capacitor element main body 2 (see FIG. 5A) and the hydrogen permeable component 30 (see FIG. 9A) are prepared.

Here, the hydrogen permeable component 30 includes a hydrogen permeable membrane 31 and a cylindrical body 32, as shown in FIG. 9A.

The hydrogen permeable membrane 31 can be manufactured by, for example, a rolling method, an ion plating method, a plating method, or the like. The hydrogen permeable membrane 31 is arranged perpendicular to the Y axis.

One end (the end in the negative direction of the Y-axis) of the cylindrical body 32 is closed with a hydrogen permeable membrane 31. The surface of the hydrogen permeable membrane 31 on the cylindrical body 32 side becomes the secondary side surface 31b, and the surface of the hydrogen permeable membrane 31 on the opposite side to the cylindrical body 32 becomes the primary side surface 31a.

In the ZX plane view, the cylindrical body 32 is arranged inside the outer periphery of the hydrogen permeable membrane 31. In other words, the hydrogen permeable membrane 31 protrudes from the outer periphery of the cylindrical body 32 in the ZX plane view. A portion of the hydrogen permeable membrane 31 that protrudes from the cylindrical body 32 is a flange portion 34 .

On the other hand, the other end of the cylindrical body 32 (the end in the positive direction of the Y-axis) is open. As a result, the bottomed hole 71 is formed. Note that the cylindrical body 32 and the hydrogen permeable membrane 31 are bonded together with a suitable adhesive.

<Placement process>
In the placement step, the hydrogen permeable component 30 is placed on the capacitor element body 2. That is, as shown in FIG. 5B, the hydrogen permeable membrane 31 of the hydrogen permeable component 30 is disposed on a part of the first end surface 21 of the capacitor element body 2. Specifically, in the ZX plane view, the hydrogen permeable membrane 31 of the hydrogen permeable component 30 is arranged inside the outer periphery of the first end surface 21 . At this time, the first end surface 21 and the hydrogen permeable membrane 31 are bonded together using a suitable adhesive. However, in order to facilitate the permeation of hydrogen through the hydrogen permeable membrane 31, the primary side surface 31a of the hydrogen permeable membrane 31 and the first end surface 21 are partially bonded to each other.

<End face electrode formation process>
In the end surface electrode forming step, a first end surface electrode 41 and a second end surface electrode 42 are formed. That is, as shown in FIG. 5C, the first end surface electrode 41 is formed on the remaining portion of the first end surface 21 of the capacitor element body 2. As described above, the remainder of the first end surface 21 refers to the portion of the first end surface 21 where the hydrogen permeable membrane 31 is not disposed.

The first end electrode 41 can be formed by, for example, metal spraying, although it is not particularly limited. When metal spraying is performed, molten metal is deposited on the first end surface 21 of the capacitor element body 2 and the flange portion 34 of the hydrogen permeable component 30. As a result, the first end electrode 41 (the outer portion 41a and the inner portion 41b) is formed. Note that when metal spraying is performed, the bottomed hole 71 of the hydrogen permeable component 30 is covered with an appropriate means to prevent molten metal from entering the bottomed hole 71.

On the other hand, a second end surface electrode 42 is formed on the second end surface 22 of the capacitor element body 2. The second end electrode 42 can also be formed by metal spraying, as in the case of the first end electrode 41.

<Sealing process>
In the sealing step, the capacitor element body 2, the first end electrode 41, and the second end electrode 42 are sealed so as not to block the other end of the cylindrical body 32. In the third embodiment, the first bus bar 81 is connected to the first end surface electrode 41 and the second bus bar 82 is connected to the second end surface electrode 42 before sealing. Thereafter, the capacitor element main body 2 is housed in the case 9, and liquid resin before hardening is poured into the case 9. Then, by curing the resin, the film capacitor 1 shown in FIG. 4 is obtained.

<Effect>
In the first embodiment, for example, after masking the portion that will become the bottomed hole 71, it is necessary to perform metal spraying on the first end face 21 and the outer peripheral portion of the hydrogen permeable membrane 31. On the other hand, in the second embodiment, after performing metal spraying as in the first embodiment, it is necessary to mask the portion that will become the bottomed hole 71 and then seal it.

In contrast, in the third embodiment, the hydrogen permeable component 30 is used to form the bottomed hole 71. Since the cylindrical body 32 of the hydrogen permeable component 30 directly becomes the bottomed hole 71, the bottomed hole 71 can be formed more easily in the third embodiment than in the first and second embodiments.

4. Fourth Embodiment Next, a film capacitor 1 according to a fourth embodiment will be described with reference to FIG. 6.

In the fourth embodiment, components similar to those in the first to third embodiments may be given the same reference numerals as those in the first to third embodiments, and detailed description thereof may be omitted.

The fourth embodiment differs from the first to third embodiments in that the hydrogen permeable membrane 31 is not in direct contact with the first end surface 21 of the capacitor element body 2.

The film capacitor 1 according to the fourth embodiment includes a capacitor element body 2, a first end electrode 41, a second end electrode 42, a sealing part 7, a hydrogen permeable membrane 31, a bus bar 8, and a case 9. , is provided. Each component will be explained in order below.

<Capacitor element body>
The capacitor element main body 2 of the fourth embodiment is similar to the capacitor element main body 2 of the first to third embodiments.

<First end electrode>
The first end surface electrode 41 is arranged on the first end surface 21 . More specifically, in the fourth embodiment, the first end surface electrode 41 is arranged over the entire first end surface 21.

The first end electrode 41 contains Zn and/or Sn (tin). A layer made of Zn allows hydrogen to permeate more easily than a layer made of Sn with the same thickness. In the fourth embodiment, the first end electrode 41 preferably contains Zn.

<Second end electrode>
The second end electrode 42 of the fourth embodiment is similar to the second end electrode 42 of the first to third embodiments. However, the second end surface electrode 42 may or may not contain Zn. Further, the second end surface electrode 42 may or may not contain Sn.

<Sealing part>
The sealing portion 7 has a bottomed hole 72 . The bottomed hole 72 has the first end electrode 41 as its bottom. However, as will be described later, the middle of the bottomed hole 72 is closed by the hydrogen permeable membrane 31.

The bottomed hole 72 is open in the positive direction of the Y-axis. The bottomed hole 72 has a circular shape in the ZX plane view. The shape of the bottomed hole 72 in the ZX plane view is not particularly limited. Examples of the shape of the bottomed hole 72 in the ZX plane view include an ellipse, a polygon, and the like. In the ZX plane view, the size of the bottomed hole 72 (inner diameter if circular, maximum length if non-circular) is not particularly limited.

<Hydrogen permeable membrane>
As described above, the hydrogen permeable membrane 31 closes the bottomed hole 72. The primary side surface 31a of the hydrogen permeable membrane 31 faces the first end electrode 41 side. The secondary side surface 31b of the hydrogen permeable membrane 31 faces the opening side of the bottomed hole 72.

The hydrogen permeable membrane 31 is supported by the sealing part 7. Specifically, in the ZX plane view, the outer peripheral portion of the hydrogen permeable membrane 31 is sandwiched between the sealing portions 7 in the Y-axis direction (see FIG. 6).

In the fourth embodiment, the thickness of the sealing part 7 (here, the distance between the surface of the first end electrode 41 facing the positive direction of the Y-axis and the surface of the sealing part 7 facing the positive direction of the Y-axis ) The thickness of the hydrogen permeable membrane 31 (thickness in the Y-axis direction) is thinner than that in the case of FIG.

<Busbar>
The bus bar 8 of the fourth embodiment is similar to the bus bar 8 of the second and third embodiments.

<Case>
Case 9 of the fourth embodiment is similar to case 9 of the second and third embodiments.

<Effect>
Also in the fourth embodiment, the film capacitor 1 can be used as in the second and third embodiments. In the fourth embodiment, as in the first to third embodiments, even if hydrogen is generated inside the capacitor element body 2 for some reason when the film capacitor 1 is used, this hydrogen can be easily discharged to the outside of the capacitor element main body 2 by the hydrogen permeable membrane 31.

In particular, in the fourth embodiment, an adhesive that can prevent the flow of hydrogen is interposed between the hydrogen permeable membrane 31 (the primary side surface 31a) and the first end electrode 41 (the surface facing the positive direction of the Y-axis). There's no need to do it. Note that in the fourth embodiment, the first end electrode 41 preferably contains Zn, which allows hydrogen to permeate relatively easily. Thereby, when hydrogen is generated inside the capacitor element main body 2, this hydrogen can pass through the first end face electrode 41 and reach the hydrogen permeable membrane 31 smoothly.

Also in the fourth embodiment, the capacitor element body 2, the first end electrode 41, and the second end electrode 42 are sealed by the sealing portion 7, as in the second and third embodiments. Therefore, the sealing portion 7 can prevent water vapor from entering the capacitor element main body 2 from the outside of the film capacitor 1 .

Furthermore, in the fourth embodiment, since the first end electrode 41, the second end electrode 42, and the dielectric film 6 are not in direct contact with the outside air, there is no need to take water vapor permeability into consideration. There is more room for selection regarding the materials of the first end electrode 41, the second end electrode 42, and the dielectric film 6.

5. Fifth Embodiment Next, a film capacitor 1 and a manufacturing method thereof according to a fifth embodiment will be described with reference to FIG. 7, FIG. 8A to FIG. 8C, and FIG. 9B.

In the fifth embodiment, components similar to those in the first to fourth embodiments may be given the same reference numerals as those in the first to fourth embodiments, and detailed description thereof may be omitted.

The fifth embodiment differs from the fourth embodiment in that the film capacitor 1 includes a cylindrical body 33.

(1) Film capacitor The film capacitor 1 according to the fifth embodiment includes a capacitor element main body 2, a first end electrode 41, a second end electrode 42, a cylindrical body 33, a hydrogen permeable membrane 31, and a sealing member. The device includes a section 7, a bus bar 8, and a case 9. Each component will be explained in order below.

<Capacitor element body>
The capacitor element main body 2 of the fifth embodiment is similar to the capacitor element main bodies 2 of the first to fourth embodiments.

<First end electrode>
The first end electrode 41 of the fifth embodiment is similar to the first end electrode 41 of the fourth embodiment.

<Second end electrode>
The second end electrode 42 of the fifth embodiment is similar to the second end electrode 42 of the first embodiment.

<Cylindrical body>
The cylindrical body 33 is a member extending in the Y-axis direction (see FIG. 7). One end (the end in the negative direction of the Y-axis) of the cylindrical body 33 is closed with a first end electrode 41 . The other end of the cylindrical body 33 (the end in the positive direction of the Y-axis) is open. In the fifth embodiment, a bottomed hole 72 is formed by the cylindrical body 33 and the first end electrode 41 . However, as will be described later, the middle of the bottomed hole 72 is closed by the hydrogen permeable membrane 31.

In the fifth embodiment, the shape of the outer periphery and inner periphery of the cylindrical body 33 is circular in the ZX plane view (see FIG. 9B), but is not particularly limited. That is, in the ZX plane view, examples of the shape of the outer circumference and inner circumference of the cylindrical body 33 include an ellipse, a polygon, and the like. The shapes of the outer circumference and inner circumference of the cylindrical body 33 in the ZX plane view may be the same or different.

Although the material of the cylindrical body 33 is not particularly limited, examples thereof include PPS (polyphenylene sulfide) and the like. The material of the cylindrical body 33 may be the same as or different from the material of the sealing part 7.

<Hydrogen permeable membrane>
The hydrogen permeable membrane 31 closes the cylindrical body 33. In other words, the hydrogen permeable membrane 31 closes the bottomed hole 72 . The primary side surface 31a of the hydrogen permeable membrane 31 faces the first end electrode 41 side. The secondary side surface 31b of the hydrogen permeable membrane 31 faces the opening side of the bottomed hole 72.

The hydrogen permeable membrane 31 is supported by a cylindrical body 33. Specifically, in the ZX plane view, the outer peripheral portion of the hydrogen permeable membrane 31 is sandwiched between the cylindrical bodies 33 in the Y-axis direction (see FIG. 7).

In the fifth embodiment, the thickness of the hydrogen permeable membrane 31 (thickness in the Y-axis direction) is thinner than the length of the cylindrical body 33 in the Y-axis direction.

<Sealing part>
In the fourth embodiment described above, the sealing portion 7 forms the inner surface of the bottomed hole 72 (see FIG. 6). In the fifth embodiment, the inner surface of the cylindrical body 33 forms the entire inner surface of the bottomed hole 72 (see FIG. 7).

The surface of the sealing portion 7 facing the positive direction of the Y-axis is flush with the other end of the cylindrical body 33 (the end facing the positive direction of the Y-axis). As long as the inside of the cylindrical body 33 is not closed, the surface of the sealing portion 7 facing in the positive direction of the Y-axis does not need to be flush with the other end of the cylindrical body 33 .

In the ZX plane view, the sealing part 7 is in close contact with the outer periphery of the cylindrical body 33.

<Busbar>
The bus bar 8 of the fifth embodiment is similar to the bus bar 8 of the second to fourth embodiments.

<Case>
Case 9 of the fifth embodiment is similar to case 9 of the second to fourth embodiments.

<Effect>
The fifth embodiment can provide the same effects as the fourth embodiment.

(2) Method for manufacturing a film capacitor The method for manufacturing the film capacitor 1 according to the fifth embodiment includes a preparation step, an end face electrode forming step, an arrangement step, and a sealing step. Each step will be explained in order below.

<Preparation process>
In the preparation step, the above-described capacitor element main body 2 (see FIG. 8A) and the hydrogen permeable component 30 (see FIG. 9B) are prepared.

Here, the hydrogen permeable component 30 includes a hydrogen permeable membrane 31 and a cylindrical body 33, as shown in FIG. 9B.

The hydrogen permeable membrane 31 can be manufactured by, for example, a rolling method, an ion plating method, a plating method, or the like. The hydrogen permeable membrane 31 is arranged perpendicular to the Y axis.

A hydrogen-permeable membrane 31 is closed between one end (end in the negative direction of the Y-axis) and the other end (end in the positive direction of the Y-axis) of the cylindrical body 33 . The surface of the hydrogen permeable membrane 31 facing in the positive direction of the Y-axis becomes the secondary side surface 31b, and the surface of the hydrogen permeable membrane 31 facing in the negative direction of the Y-axis becomes the primary side surface 31a.

In the ZX plane view, the outer peripheral portion of the hydrogen permeable membrane 31 is sandwiched between the cylindrical bodies 33 in the Y-axis direction (see FIG. 7). In this way, the hydrogen permeable membrane 31 is supported by the cylindrical body 33.

<End face electrode formation process>
In the end surface electrode forming step, a first end surface electrode 41 and a second end surface electrode 42 are formed. That is, as shown in FIG. 8B, the first end surface electrode 41 is formed on the first end surface 21 (the entire first end surface 21 in the fifth embodiment) of the capacitor element body 2. The first end electrode 41 can be formed by, for example, metal spraying, although it is not particularly limited.

On the other hand, a second end surface electrode 42 is formed on the second end surface 22 (the entire second end surface 22 in the fifth embodiment) of the capacitor element body 2. The second end electrode 42 can also be formed by metal spraying, as in the case of the first end electrode 41.

<Placement process>
In the placement step, the hydrogen permeable component 30 is placed on the capacitor element body 2. That is, one end of the hydrogen permeable component 30 (the end of the cylindrical body 33 facing in the negative direction of the Y axis) is arranged in a part of the first end face electrode 41 of the capacitor element main body 2 . Specifically, the hydrogen permeable component 30 is arranged inside the outer periphery of the first end electrode 41 in the ZX plane view. At this time, the hydrogen permeable component 30 and the first end electrode 41 are bonded together using a suitable adhesive.

<Sealing process>
In the sealing step, the capacitor element body 2, the first end electrode 41, and the second end electrode 42 are sealed so as not to block the other end of the cylindrical body 33. In the fifth embodiment, the first bus bar 81 is connected to the first end surface electrode 41 and the second bus bar 82 is connected to the second end surface electrode 42 before sealing. Thereafter, the capacitor element main body 2 is housed in the case 9, and liquid resin before hardening is poured into the case 9. Then, by curing the resin, the film capacitor 1 shown in FIG. 7 is obtained.

<Effect>
In the fourth embodiment, it is necessary to seal the portion that will become the bottomed hole 72 and place the hydrogen permeable membrane 31 in the middle of the bottomed hole 72.

In contrast, in the fifth embodiment, the hydrogen permeable component 30 is used to form the bottomed hole 72. The cylindrical body 33 of the hydrogen permeable component 30 directly serves as the bottomed hole 72, and the middle of the bottomed hole 72 is closed in advance with the hydrogen permeable membrane 31. Therefore, in the fifth embodiment, the bottomed hole 72 can be formed more easily than in the fourth embodiment.

3. Modifications The first to fifth embodiments can be modified in various ways according to the design, etc., as described below, as long as the objective of the present disclosure can be achieved.

In the first embodiment, the first end electrode 41 (inner portion 41b) rides on the outer peripheral portion of the hydrogen permeable membrane 31; (Secondary side surface 31b) may be flush with it.

In the first embodiment, the first end electrode 41 has the outer portion 41a and the inner portion 41b, but the first end electrode 41 does not need to have the inner portion 41b. However, it is preferable that no gap exists between the first end electrode 41 and the hydrogen permeable membrane 31.

In the second to fifth embodiments, the film capacitor 1 includes the bus bar 8 and the case 9, but the film capacitor 1 may not include at least one of the bus bar 8 and the case 9.

In the second to fifth embodiments, the first bus bar 81 and the second bus bar 82 protrude in the same direction, but may protrude in different directions.

In the third embodiment, the hydrogen permeable member 30 has the flange portion 34 (see FIG. 9A), but may not have the flange portion 34. That is, the hydrogen permeable member 30 may have a bottomed cylindrical shape without the flange portion 34.

In the fourth and fifth embodiments, the hydrogen permeable membrane 31 (primary side surface 31a) is not in contact with the first end surface electrode 41 (the surface facing in the positive direction of the Y axis); It may be in contact with the electrode 41.

Although the film capacitor 1 according to the first to fifth embodiments is of a wound type, the film capacitor 1 may be of a laminated type. In the laminated film capacitor 1, the capacitor element body 2 is formed by alternately laminating first electrodes 51 and second electrodes 52 in a fixed direction with dielectric films 6 in between.

4. Aspects As is clear from the above embodiments and modifications, the present disclosure includes the following aspects. In the following, reference numerals are given in parentheses only to clearly indicate the correspondence with the embodiments.

A first aspect is a film capacitor (1), which includes a capacitor element body (2) having a first end surface (21) and a second end surface (22) opposite to the first end surface (21); A hydrogen permeable membrane (31) disposed on a part of the first end face (21), a first end face electrode (41) disposed on the remainder of the first end face (21), and a hydrogen permeable membrane (31) disposed on a part of the first end face (21); ). The capacitor element body (2) includes a first electrode (51) connected to the first end electrode (41) and not connected to the second end electrode (42), and a second end electrode (42). 42) and not connected to the first end electrode (41), and a dielectric interposed between the first electrode (51) and the second electrode (52). body film (6).

According to this aspect, even if hydrogen is generated inside the capacitor element body (2), this hydrogen can be easily released to the outside of the capacitor element body (2).

The second aspect is a film capacitor (1) based on the first aspect. In a second aspect, the capacitor element further includes a sealing part (7) that seals the capacitor element main body (2), the first end electrode (41), and the second end electrode (42). The sealing portion (7) has a bottomed hole (71) whose bottom is the hydrogen permeable membrane (31).

According to this aspect, even if hydrogen is generated inside the capacitor element body (2), this hydrogen can be easily released to the outside of the capacitor element body (2). Furthermore, the sealing portion (7) can prevent water vapor from entering the capacitor element body (2) from the outside of the film capacitor (1).

A third aspect is a film capacitor (1), which includes a capacitor element body (2) having a first end surface (21) and a second end surface (22) opposite to the first end surface (21); a hydrogen permeable membrane (31) disposed on a part of the first end surface (21); and a cylindrical body (32) whose one end is closed by the hydrogen permeable membrane (31) and whose other end is open. , a first end surface electrode (41) disposed on the remainder of the first end surface (21), a second end surface electrode (42) disposed on the second end surface (22), and the capacitor element main body (2). , a sealing part (7) that seals the first end electrode (41) and the second end electrode (42). The capacitor element body (2) includes a first electrode (51) connected to the first end electrode (41) and not connected to the second end electrode (42), and a second end electrode (42). 42) and not connected to the first end electrode (41), and a dielectric interposed between the first electrode (51) and the second electrode (52). body film (6).

According to this aspect, even if hydrogen is generated inside the capacitor element body (2), this hydrogen can be easily released to the outside of the capacitor element body (2). Furthermore, the sealing portion (7) can prevent water vapor from entering the capacitor element body (2) from the outside of the film capacitor (1).

The fourth aspect is a method for manufacturing a film capacitor (1), which includes a preparation step, a placement step, an end electrode formation step, and a sealing step. In the preparation step, a capacitor element main body (2) having a first end surface (21) and a second end surface (22) opposite to the first end surface (21), and a hydrogen permeable membrane (31); A hydrogen permeable component (30) having a cylindrical body (32) whose one end is closed with a hydrogen permeable membrane (31) and whose other end is open is prepared. In the placement step, the hydrogen permeable membrane (31) of the hydrogen permeable component (30) is placed on a part of the first end surface (21) of the capacitor element body (2). In the end face electrode forming step, a first end face electrode (41) is formed on the remaining part of the first end face (21) of the capacitor element main body (2), and a first end face electrode (41) is formed on the remaining part of the first end face (21) of the capacitor element main body (2). ) is formed with a second end surface electrode (42). In the sealing step, the capacitor element main body (2), the first end electrode (41), and the second end electrode (42) are sealed so as not to block the other end of the cylindrical body (32). Seal.

According to this aspect, the cylindrical body (32) of the hydrogen permeable component (30) directly becomes the bottomed hole (71), so that the bottomed hole (71) can be easily formed.

A fifth aspect is a film capacitor (1), which includes a capacitor element body (2) having a first end surface (21) and a second end surface (22) on the opposite side of the first end surface (21); A first end surface electrode (41) disposed on the first end surface (21), a second end surface electrode (42) disposed on the second end surface (22), and a first end surface electrode (41) disposed on the bottom surface. a sealing portion (7) having a bottomed hole (72) and sealing the capacitor element body (2), the first end electrode (41), and the second end electrode (42); and a hydrogen permeable membrane (31) that closes the bottomed hole (72). The capacitor element body (2) includes a first electrode (51) connected to the first end electrode (41) and not connected to the second end electrode (42), and a second end electrode (42). 42) and not connected to the first end electrode (41), and a dielectric interposed between the first electrode (51) and the second electrode (52). body film (6).

According to this aspect, even if hydrogen is generated inside the capacitor element body (2), this hydrogen can be easily released to the outside of the capacitor element body (2). Furthermore, the sealing portion (7) can prevent water vapor from entering from the outside of the film capacitor (1) into the inside of the capacitor element body (2).

A sixth aspect is a film capacitor (1), which includes a capacitor element body (2) having a first end surface (21) and a second end surface (22) opposite to the first end surface (21); A first end surface electrode (41) disposed on the first end surface (21), a second end surface electrode (42) disposed on the second end surface (22), and one end formed by the first end surface electrode (41). a cylindrical body (33) with a closed end and an open end, a hydrogen permeable membrane (31) that closes the cylindrical body (33), the capacitor element main body (2), and the first end electrode. (41), and a sealing part (7) that seals the second end electrode (42). The capacitor element body (2) includes a first electrode (51) connected to the first end electrode (41) and not connected to the second end electrode (42), and a second end electrode (42). 42) and not connected to the first end electrode (41), and a dielectric interposed between the first electrode (51) and the second electrode (52). body film (6).

According to this embodiment, even if hydrogen is generated inside the capacitor element body (2), this hydrogen can be easily released to the outside of the capacitor element body (2). In addition, the sealing portion (7) can prevent water vapor from entering the inside of the capacitor element body (2) from the outside of the film capacitor (1).

The seventh aspect is a method for manufacturing a film capacitor (1), which includes a preparation step, an end electrode formation step, a placement step, and a sealing step. In the preparation step, a capacitor element main body (2) having a first end surface (21) and a second end surface (22) opposite to the first end surface (21), and a hydrogen permeable membrane (31); A hydrogen permeable component (30) having a cylindrical body (33) whose one end and the other end are closed with a hydrogen permeable membrane (31) is prepared. In the end face electrode forming step, a first end face electrode (41) is formed on the first end face (21) of the capacitor element body (2), and a first end face electrode (41) is formed on the second end face (22) of the capacitor element body (2). A second end surface electrode (42) is formed. In the placement step, one end of the hydrogen permeable component (30) is placed on a part of the first end electrode (41) of the capacitor element body (2). In the sealing step, the capacitor element main body (2), the first end electrode (41), and the second end electrode (42) are sealed so as not to block the other end of the cylindrical body (33). Seal.

According to this aspect, the cylindrical body (33) of the hydrogen permeable component (30) becomes the bottomed hole (72) as it is, and the middle of the bottomed hole (72) is closed in advance with the hydrogen permeable membrane (31). There is. Therefore, the bottomed hole (72) can be easily formed.

1 Film capacitor 2 Capacitor element body 21 First end face 22 Second end face 30 Hydrogen permeable component 31 Hydrogen permeable membrane 32 Cylindrical body 33 Cylindrical body 41 First end face electrode 42 Second end face electrode 51 First electrode 52 Second electrode 6 Dielectric film 7 Sealing part 71 Bottom hole 72 Bottom hole 8 Bus bar 81 First bus bar 82 Second bus bar 9 Case

Claims (7)

a capacitor element body having a first end surface and a second end surface opposite to the first end surface; a hydrogen permeable membrane disposed on a part of the first end surface; and a hydrogen permeable membrane disposed on the remainder of the first end surface. comprising a first end surface electrode and a second end surface electrode disposed on the second end surface,
The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.
Film capacitor. further comprising a sealing part that seals the capacitor element body, the first end electrode, and the second end electrode,
The sealing portion has a bottomed hole with the hydrogen permeable membrane as the bottom.
The film capacitor according to claim 1. a capacitor element main body having a first end surface and a second end surface opposite to the first end surface; a hydrogen permeable membrane disposed on a part of the first end surface; one end closed by the hydrogen permeable membrane; and a cylindrical body whose other end is open, a first end surface electrode disposed on the remainder of the first end surface, a second end surface electrode disposed on the second end surface, the capacitor element main body, and the first end surface electrode. An end surface electrode, and a sealing part that seals the second end surface electrode,
The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.
Film capacitor. A capacitor element main body having a first end surface and a second end surface opposite to the first end surface, a hydrogen permeable membrane, and a cylindrical body whose one end is closed by the hydrogen permeable membrane and whose other end is open. a preparation step of preparing a hydrogen permeable component having;
arranging the hydrogen permeable membrane of the hydrogen permeable component on a part of the first end surface of the capacitor element body;
an end surface electrode forming step of forming a first end surface electrode on the remainder of the first end surface of the capacitor element body, and forming a second end surface electrode on the second end surface of the capacitor element body;
a sealing step of sealing the capacitor element body, the first end electrode, and the second end electrode so as not to block the other end of the cylindrical body;
Method of manufacturing film capacitors. a capacitor element body having a first end surface and a second end surface opposite to the first end surface; a first end surface electrode disposed on the first end surface; and a second end surface electrode disposed on the second end surface. , having a bottomed hole with the first end electrode as the bottom, and a sealing part for sealing the capacitor element main body, the first end electrode, and the second end electrode, and the bottomed hole. A hydrogen permeable membrane that blocks the
The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.
Film capacitor. a capacitor element body having a first end surface and a second end surface opposite to the first end surface; a first end surface electrode disposed on the first end surface; and a second end surface electrode disposed on the second end surface. , a cylindrical body whose one end is closed by the first end electrode and whose other end is open, a hydrogen permeable membrane that closes the cylindrical body, the capacitor element body, the first end electrode, and the first end electrode. A sealing part that seals the two end surface electrodes,
The capacitor element body includes a first electrode connected to the first end electrode and not connected to the second end electrode, and a first electrode connected to the second end electrode and connected to the first end electrode. and a dielectric film interposed between the first electrode and the second electrode.
Film capacitor. a capacitor element body having a first end surface and a second end surface opposite to the first end surface, a hydrogen permeable membrane, and a cylindrical body whose one end and the other end are closed with the hydrogen permeable membrane; a preparation step of preparing a hydrogen permeable component having;
an end surface electrode forming step of forming a first end surface electrode on the first end surface of the capacitor element body, and forming a second end surface electrode on the second end surface of the capacitor element body;
arranging one end of the hydrogen permeable component on a part of the first end electrode of the capacitor element body;
a sealing step of sealing the capacitor element body, the first end electrode, and the second end electrode so as not to block the other end of the cylindrical body;
Method of manufacturing film capacitors.

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