WO2022202193A1

WO2022202193A1 - Film capacitor, coupling capacitor, inverter, and electric vehicle

Info

Publication number: WO2022202193A1
Application number: PCT/JP2022/009172
Authority: WO
Inventors: 耕世神垣
Original assignee: 京セラ株式会社
Priority date: 2021-03-25
Filing date: 2022-03-03
Publication date: 2022-09-29
Also published as: JPWO2022202193A1

Abstract

This film capacitor includes: a film laminate made by laminating dielectric films so that every other dielectric film is inverted; and a first metal electrode and a second metal electrode that are respectively located on a pair of end surfaces of the film laminate. A metal layer has a connecting metal layer that connects a common metal layer to a strip-shaped metal layer. A first connecting wiring extends in a first direction from the common metal layer. A second connecting wiring extends in a second direction from the first connecting wiring. A third connecting wiring extends in the first direction from the second connecting wiring and is directly connected to the strip metal layer. The end of the second connecting wiring connected to the third connecting wiring is located more outward, in the second direction, than a first lateral edge of the strip metal layer.

Description

Film capacitors, coupled capacitors, inverters and electric vehicles

The present disclosure relates to film capacitors, coupled capacitors, inverters, and electric vehicles.

An example of conventional technology is described in Patent Document 1.

Japanese Patent No. 5984097

In the film capacitor of the present disclosure, a metal layer is provided on one surface, and a first edge in a first direction of the one surface and an edge continuous in a second direction orthogonal to the first direction A rectangular parallelepiped film laminate in which a plurality of dielectric films having an insulating region are laminated, and in a first state in which the orientations are reversed so that the positions of the edge insulating regions in a plan view overlap with each other. a film laminate obtained by laminating a dielectric film and a dielectric film in a second state; and a first metal electrode and a second metal electrode. The metal layer electrically connected to the first metal electrode includes: a common metal layer extending in the second direction and provided at a second edge of the one surface in the first direction; a plurality of strip-like metal layers extending in a direction and electrically connected to the common metal layer; and a connection metal layer connecting the common metal layer and the strip-like metal layer, wherein the connection metal layer comprises: a first connection wiring directly connected to the common metal layer and extending from the common metal layer in the first direction; and a first connection wiring directly connected to the first connection wiring and extending from the first connection wiring in the second direction. and a third connection wiring directly connected to the second connection wiring, extending from the second connection wiring in the first direction and directly connected to the strip-shaped metal layer; Prepare. An end portion of the second connection wiring connected to the third connection wiring is located outside the first side edge of the strip-shaped metal layer in the second direction, and the connection metal of the dielectric film in the first state The layer and the connection metal layer of the dielectric film in the second state are arranged point-symmetrically about the center of the one surface.

In the film capacitor of the present disclosure, a first metal layer is provided on one surface, and the first metal layer is provided on a first edge of the one surface in a first direction, and a second metal layer perpendicular to the first direction. a first common metal layer continuously positioned along the direction of and a second edge of the one surface in the first direction, and a second a first dielectric film having a common metal layer; and a second metal layer disposed on one side, and the first edge and the second edge of the one side in a first direction, respectively. and a second dielectric film having an edge insulating region continuous along a second direction orthogonal to the direction perpendicular to the second direction. a film laminate laminated such that a part of a layer and a part of the second metal layer overlap; a first metal electrode and a second metal electrode electrically connected to the layer. The first metal layer includes a plurality of first strip-shaped metal layers extending in the first direction and electrically connected to the first common metal layer, and a plurality of first strip-shaped metal layers extending in the first direction and the second common metal layer a plurality of second strip-like metal layers electrically connected to the layers; a first connection metal layer connecting the first common metal layer and the first strip-like metal layer; and a second connection metal layer connecting the two strip-shaped metal layers. The second metal layer is a planar metal layer electrically insulated from the first metal electrode and the second metal electrode by the edge insulating region. The first connection metal layer is directly connected to the first common metal layer, and is directly connected to the first connection wiring extending from the first common metal layer in the first direction. a second connection wiring extending in the second direction from the first connection wiring; and a second connection wiring directly connected to the second connection wiring and extending in the first direction from the second connection wiring. and a third connection wiring directly connected to the first strip-shaped metal layer. The second connection metal layer is directly connected to the second common metal layer, and is directly connected to a fourth connection wiring extending from the second common metal layer in the first direction, and the fourth connection wiring. a fifth connection wiring extending in the second direction from the fourth connection wiring; and a fifth connection wiring directly connected to the fifth connection wiring and extending in the first direction from the fifth connection wiring. and a sixth connection wiring directly connected to the second strip-shaped metal layer. An end portion of the second connection wiring connected to the third connection wiring is positioned outside the first side edge of the first strip-shaped metal layer in the second direction, and the sixth connection wiring of the fifth connection wiring An end connected to the connection wiring is positioned outside the first side of the second strip-shaped metal layer in the second direction, and the first connection metal layer and the second connection metal layer They are arranged symmetrically with respect to the center of the one surface of one dielectric film.

In the coupled capacitor of the present disclosure, a plurality of film capacitors including the film capacitors described above are connected by bus bars.

The inverter of the present disclosure includes a bridge circuit composed of switching elements, and a capacitive section connected to the bridge circuit and including the film capacitor described above.

An electric vehicle of the present disclosure includes a power source, the inverter connected to the power source, a motor connected to the inverter, and wheels driven by the motor.

1 is a diagram showing the structure of a film capacitor according to a first embodiment, and is a plan view of a dielectric film; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the film capacitor of 1st Embodiment, and is a cross-sectional schematic diagram which shows the laminated state of a film. It is a figure which shows the structure of the film capacitor of 1st Embodiment, and is the top view which looked at the film capacitor from upper direction. 4 is an enlarged plan view of the vicinity of a connection metal layer of a dielectric film; FIG. FIG. 3 is an enlarged exploded perspective view showing a laminated state of a dielectric film in a first state and a film in a second state; FIG. 3 is an exploded perspective view showing a laminated state (before cutting) of dielectric films; FIG. 4 is an external perspective view showing the configuration of a film laminate after being cut; FIG. 3 is an external perspective view showing a configuration after thermal spraying of metal electrodes; FIG. 11 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film in the second embodiment; FIG. 11 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film in the second embodiment; FIG. 12 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film in the third embodiment; FIG. 14 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film in the fourth embodiment; FIG. 11 is a diagram showing the configuration of a film capacitor according to a fifth embodiment, and is a plan view of a dielectric film; FIG. 11 is a diagram showing the configuration of a film capacitor according to a fifth embodiment, and is a plan view of a dielectric film; It is a figure which shows the structure of the film capacitor of 5th Embodiment, and is a cross-sectional schematic diagram which shows the laminated state of a film. 4 is an enlarged plan view of the vicinity of the first connection metal layer and the second connection metal layer; FIG. FIG. 12 is a diagram showing the configuration of a film capacitor according to a sixth embodiment, and is a plan view of a dielectric film; FIG. 12 is a diagram showing the configuration of a film capacitor according to a sixth embodiment, and is a plan view of a dielectric film; It is a figure which shows the structure of the film capacitor of 6th Embodiment, and is a cross-sectional schematic diagram which shows the laminated state of a film. It is an external appearance perspective view which shows the modification of a film capacitor. 1 is a perspective view schematically showing the configuration of a coupled capacitor; FIG. 2 is a schematic configuration diagram for explaining the configuration of an inverter; FIG. 1 is a schematic configuration diagram for explaining the configuration of an electric vehicle; FIG.

The objects, features, and advantages of the present disclosure will become clearer from the detailed description and drawings below.

A film capacitor having a configuration that forms the basis of the present disclosure is configured by, for example, winding a metallized film in which a metal film that serves as an electrode is vapor-deposited on the surface of a dielectric film containing polypropylene resin, or by stacking multiple sheets in one direction. It is

Of these, in the case of the multilayer film capacitor, when a laminate of metallized films is cut into a desired size, the metal film is also cut, so the metal film is exposed at the cut surface. When a film capacitor is used, if a voltage is applied to the exposed metal film, discharge will occur at the cut surface.

In Patent Document 1, in a metallized film that constitutes a film capacitor, in a part of the exposed part (gap strip) of the film surface of a groove-shaped or constant-width belt-shaped film that does not have a metal film, called an insulating margin, A configuration has been proposed in which exposed metal films are insulated on a cut surface of a laminate in which metallized films are laminated by having bent portions oblique to the parallel direction in which each insulating margin extends.

However, although the multilayer film capacitor described in Patent Document 1 may reduce the discharge at the cut surface, there is a problem that the capacitance loss near the cut surface in the film laminate is large.

An object of the present disclosure is to provide a laminated film capacitor, a coupled capacitor, an inverter, and an electric vehicle that reduce discharge at the end face and have little capacitance loss.

The film capacitor of the first embodiment of the present disclosure will be described below with reference to the drawings. A film capacitor 10 of this embodiment is constructed by alternately laminating a plurality of

dielectric films

1 or 2 having a metal layer 3 on one surface of a base film as shown in FIG. 1A.

In this embodiment, the metal layer 3 is a so-called comb-shaped metal layer, and includes a plurality of strip-shaped metal layers 3a, a plurality of connection metal layers 3b, and one common metal layer 3c. The layers 3a are electrically connected to a common metal layer 3c via respective connection metal layers 3b.

Each strip-shaped metal layer 3a becomes an internal electrode of the capacitor after lamination. The

dielectric films

1 and 2 have the same configuration, except that the direction of lamination is reversed. 3a is numbered 1A to 1L or 2A to 2L in order from the end. The dielectric film 1 and the dielectric film 2 whose directions are opposite to each other are the dielectric film in the first state and the dielectric film in the second state, respectively.

Also, in each drawing, the direction in which the strip-shaped metal layers 3a extending parallel to each other is called the first direction, and the direction in which the parallel strip-shaped metal layers 3a are arranged is called the second direction. The lamination direction of the films is the third direction (the z-direction in the figure) that is orthogonal to the first direction and the second direction. In some cases, the first direction is called the x direction, the second direction is called the y direction, and the third direction is called the z direction. The details of the film laminate 4 after lamination will be described later.

Each strip-shaped metal layer 3a on the surface of the

dielectric films

1 and 2 is formed by metal vapor deposition on the base film. Each strip-shaped metal layer 3a extends linearly along the first direction. A film surface (hereinafter referred to as an insulating margin S) is exposed between the strip-shaped metal layers 3a adjacent in the y direction, whereby each strip-shaped metal layer 3a is electrically insulated from each other. there is Each insulating margin S is connected to an edge insulating region T that continues in the second direction (y direction) on the first end side in the first direction (x direction). The interval (pitch P) between the insulation margins S is the sum of the y-direction width P1 of each strip-shaped metal layer 3a and the y-direction width P2 of each insulation margin S (P=P1+P2).

The common metal layer 3c extends in the second direction on the side opposite to the edge insulating region T of the

dielectric films

1, 2, that is, on the second edge of the first direction. Each band-like metal layer 3a is electrically insulated by an insulating margin S, but by connecting to one common metal layer 3c, the metal layer 3 as a whole is electrically connected.

The connection metal layer 3b connects the strip-shaped metal layer 3a and the common metal layer 3c and functions as a fuse for each strip-shaped metal layer 3a. For example, when the strip-shaped metal layer 3a is short-circuited with another strip-shaped metal layer 3a due to dielectric breakdown of the base film, etc., and a current exceeding a specified value flows, the connection metal layer 3b is burnt out and disconnected. This prevents the function of the entire film capacitor 10 from stopping.

As shown in the enlarged plan view of the vicinity of the connection metal layer in FIG. 2, the connection metal layer 3b includes a first connection wire 3b1, a second connection wire 3b2, and a third connection wire 3b3. The first connection wiring 3b1 is directly connected to the common metal layer 3c and extends from the common metal layer 3c in the first direction. The second connection wiring 3b2 is directly connected to the first connection wiring 3b1 and extends from the first connection wiring 3b1 in the second direction. The third connection wiring 3b3 is directly connected to the second connection wiring 3b2, extends in the first direction from the second connection wiring 3b2, and is directly connected to the strip-shaped metal layer 3a. In this embodiment, the first connection wiring 3b1, the second connection wiring 3b2, and the third connection wiring 3b3 all have a linear shape. Here, "extending in the first direction" means that the first directional component of the extending direction is greater than the second directional component. Similarly, "extending in the second direction" refers to the case where the second directional component of the extending direction is greater than the first directional component. The connection metal layer 3b having such a structure has a higher electrical resistance than the strip-shaped metal layer 3a, and functions as a fuse.

In the connection metal layer 3b of the present embodiment, the first connection wiring 3b1 and the third connection wiring 3b3 extend in parallel in the first direction, and the second connection wiring 3b2 extends in parallel in the second direction. has been extended to An end of second connection wiring 3b2 connected to third connection wiring 3b3 is positioned outside first side 3a1 of strip-shaped metal layer 3a in the second direction. The third connection wiring 3b3, for example, extends in the first direction from the second connection wiring 3b2 and directly connects to the first side 3a1 of the strip-shaped metal layer 3a. In addition, the end portion of the second connection wiring 3b2 connected to the first connection wiring 3b1 is located on the same side as or inside the second side 3a2 of the strip-shaped metal layer 3a in the second direction. may In this embodiment, one end of the second connection wiring 3b2 is positioned outside the first side 3a1, and the other end of the second connection wiring 3b2 is positioned at the same position as the second side 3a2. , the length L of the second connection wiring 3b2 in the second direction is greater than the width W of the strip-shaped metal layer 3a. The length L in the second direction is the projected length of the second connection wiring 3b2 in the second direction.

As shown in the exploded perspective view of FIG. 3, the connection metal layer 3b of the dielectric film 1 in the first state and the connection metal layer 3b of the dielectric film 2 in the second state opposite to the first state. are arranged symmetrically about the center of one surface of the base film. That is, when the film laminate 4 is viewed in the z-direction, when the connection metal layer 3b of the dielectric film 1 is rotated by 180° around the target point, it has the same shape as the connection metal layer 3b of the dielectric film 2. .

At the time of manufacturing the film capacitor 10, the film laminate 4 is obtained, for example, by cutting a long laminate. The cutting line is parallel to the first direction (x direction), but is not always at the same position in the width direction of the strip-shaped metal layer 3a. Since the cut strip-shaped metal layer 3a is exposed at the end surface of the film capacitor 10 in the second direction (y-direction), if the strip-shaped metal layer 3a is in a state of being electrically connected to the common metal layer 3c even after the cutting, During use, a voltage is applied to the strip-shaped metal layer 3a and discharge occurs at the end face. When the belt-like metal layer 3a and the common metal layer 3c are connected by the connection metal layer 3b as in the present embodiment, the second connection wiring 3b2 of the dielectric film 1 is connected regardless of the position of the cutting line. Since at least one of the second connection wirings 3b2 of the dielectric film 2 crosses the cutting line, one or both of the second connection wirings 3b2 are cut, and the strip metal layer 3a and the common metal layer 3c are electrically connected. effectively insulated. Thereby, the discharge at the end surface of the film capacitor 10 can be reduced. Furthermore, since the strip-shaped metal layer 3a electrically insulated from the common metal layer 3c is only the cut strip-shaped metal layer 3a, the film capacitor 10 can be provided with little capacitance loss.

Examples of constituent materials for the base films of the

dielectric films

1 and 2 include organic resin materials such as polypropylene, polyethylene terephthalate, polyarylate, and cycloolefin polymer.

As shown in FIG. 1B, the

dielectric films

1 and 2 are laminated while alternately reversing the direction of the dielectric film 1 and the dielectric film 2 vertically adjacent to it by 180° in the x direction. The

dielectric films

1 and 2 are stacked so that the position of the edge insulating region T at one end of each

dielectric film

1 and 2 is alternately reversed in the x-direction to form a film stack 4. . Similarly, the positions of the common metal layers 3c at the other ends of the

dielectric films

1 and 2 are alternately stacked in the x direction.

Metal electrodes (hereinafter referred to as metallikon) are positioned by metal spraying on both end surfaces of the film laminate 4 in the x direction. One of the metallicons located at both ends in the x direction is called a metallikon 5A (first metal electrode), and the other is called a metallikon 5B (second metal electrode). No difference. For example, the metallikon 5A is electrically connected to the common metal layer 3c of the dielectric film 1, and is also electrically connected to each strip-shaped metal layer 3a through the common metal layer 3c. In addition, the metal layer 3 of the dielectric film 1 and the metallikon 5B are electrically insulated by the edge insulating region T. As shown in FIG. On the other hand, the metallikon 5B is electrically connected to the common metal layer 3c of the dielectric film 2, and is also electrically connected to each strip-shaped metal layer 3a through the common metal layer 3c. In addition, the metal layer 3 of the dielectric film 2 and the metallikon 5A are electrically insulated by the edge insulating region T. As shown in FIG.

4 to 6 are diagrams schematically explaining the process of manufacturing a film capacitor. 4 to 6, as in FIGS. 1A to 1C, the extending direction of each strip-shaped metal layer 3a located in parallel is the first direction (the x direction in the drawing), and the extending direction of the common metal layer 3c (the x direction). The y-direction perpendicular to each other) is the second direction, and the lamination direction of the film, which is perpendicular to the first direction and the second direction, is the third direction (z-direction).

In manufacturing the laminated film capacitor 10, first, as shown in FIG. 4, the surface of the film has a plurality of strip-shaped metal layers 3a continuous in the x direction and a common metal layer 3c extending in the y direction. A plurality of

dielectric films

1 and 2 are alternately reversed in direction in the x direction, that is, the direction in the x direction is set to 1 so that the positions of the edge insulating regions T in a plan view overlap every other film. Stack while turning each sheet by 180°.

As described above, in the present embodiment, the dielectric film 1 and the dielectric film 2 are only reversed in the x direction, and have the same configuration, but are not limited to this. , the structures of the dielectric film 1 and the dielectric film 2 may be different. For example, in a state in which the

dielectric films

1 and 2 are laminated so that the edge insulating regions T overlap every other sheet in plan view, the dielectric film 1 is placed on the +y side of the strip-shaped metal layer 3a. The third connection wiring 3b3 may be connected to the side, and the dielectric film 2 may be connected to the +y side of the strip-shaped metal layer 3a to the third connection wiring 3b3. That is, the dielectric film 1 and the dielectric film 2 are different in that the connection metal layer 3b is line-symmetrical with respect to the x-direction, and other configurations may be the same. Moreover, as a method of stacking, the

long dielectric films

1 and 2 can be stacked and wound around a cylinder or a cylinder having a polygonal cross section, or the like, by a conventionally known method. A virtual line (a two-dot chain line) in FIG. 4 indicates a cutting line after being wound around a cylinder or the like.

FIG. 5 is a diagram of the film laminate 4 after being cut to a predetermined length, viewed from the cut surface (y-direction end surface) direction. As shown in FIG. 5, the vertically adjacent

dielectric films

1 and 2 are laminated in a state in which their positions are slightly shifted in the x direction (offset state). The common metal layer 3c is exposed on both end faces in the x direction. As shown in FIG. 5, the band-shaped metal layer 3a exposed on the cut surface of the film laminate 4 is not connected to the common metal layer 3c because the second connection wiring 3b2 is cut, and the common metal layer 3c is not connected to the common metal layer 3c. is electrically isolated from

Note that an insulating layer 12, such as a base film that does not have the metal layer 3, may be laminated on the upper surface of the film laminate 4 of the embodiment as a protective layer for the film laminate 4. The insulating layer 12 may be omitted.

Next, as shown in FIG. 6, a first metal electrode and a second metal electrode (metallicon) are respectively formed by metal spraying on both end surfaces of the film laminate 4 in the x direction where the common metal layer 3c is exposed. 5A, 5B). As a result, each strip-shaped metal layer 3a on the

dielectric films

1 and 2 is electrically connected to either one of the

metallicons

5A and 5B through the common metal layer 3c so as to function as an internal electrode of the film capacitor 10. become.

Film capacitors of other embodiments will be described below. Other embodiments differ from the above-described first embodiment only in the configuration of the connection metal layer 3b, and the other configurations are common. 7A and 7B show the connection metal layer 3b of the second embodiment. As shown in FIGS. 7A and 7B, in the second embodiment, the end portion of the second connection wiring 3b2 connected to the third connection wiring 3b3 is positioned further than the first side 3a1 of the strip-shaped metal layer 3a in the second direction. located outside.

The connection metal layer 3b of the first embodiment has a higher electrical resistance than the strip-shaped metal layer 3a and functions as a fuse. The longer the connection metal layer 3b, the higher the energy required to break the connection metal layer 3b when the strip-shaped metal layer 3a is short-circuited. In the present embodiment, the electrical resistance of the first connection wiring 3b1 is locally increased, so that when the strip-shaped metal layer 3a is short-circuited, the first connection wiring 3b1 is likely to break, and the fuse function of the connection metal layer 3b is improved. . Further, in the present embodiment, the width of the second connection wiring 3b2 is larger than the width of the third connection wiring 3b3, so that the third connection wiring 3b3 is easily broken, and the fuse function of the connection metal layer 3b is improved. In the example shown in FIG. 7A, the width of the second connection wiring 3b2 is constant. In the example shown in FIG. 7B, the width of the second connection wiring 3b2 is larger at the central portion than at both end portions. That is, the portion connected to the first connection wiring 3b1 and the portion connected to the third connection wiring 3b3 have the same width as the widths of the first connection wiring 3b1 and the third connection wiring 3b3, respectively, and the width is larger in the central portion. ing.

The second connection wiring 3b2 of the second embodiment has a wiring width larger than that of the second connection wiring 3b2 of the first embodiment. Thereby, the equivalent series resistance (ESR) of the film capacitor 10 of the second embodiment can be made lower than that of the first embodiment. By reducing the ESR, the permissible value of the ripple current of the film capacitor 10 can be increased.

FIG. 8 shows the connection metal layer 3b of the third embodiment. As shown in FIG. 8, in the third embodiment, the second connection wiring 3b2 has a meandering shape (meandering shape). In the first embodiment, the second connection wiring 3b2 has a linear shape, whereas in the third embodiment it has a meandering shape. The connection metal layer 3b of the third embodiment secures the wiring length of the second connection wiring 3b2 by making the second connection wiring 3b2 meandering. Even if dielectric breakdown occurs in the

dielectric films

1 and 2 and an excessive current flows through the strip-shaped metal layer 3a, the second connection wiring 3b2 is less likely to be disconnected, and the connection metal layer 3b can be operated as a fuse appropriately. can be suppressed. As a result, it is possible to suppress an early decrease in the capacitance of the film capacitor 10 due to excessive actuation of the fuse and isolation of the strip-shaped metal layer 3a from the common metal layer 3c.

In each of the above-described embodiments, the film laminate 4 is obtained by laminating the

dielectric films

1 and 2 while alternately reversing the directions in the x direction, and the

dielectric films

1 and 2 are the same. It is the composition that the direction is different. For example, instead of the dielectric film 2, a dielectric film having a so-called solid pattern full metal layer, which has a metal layer on the entire region other than the edge insulating region T on one surface of the base film, is used. may The metallikon 5A (first metal electrode) is electrically connected to the common metal layer 3c of the dielectric film 1. As shown in FIG. Also, the metallikon 5B (second metal electrode) is electrically connected to the entire metal layer of the dielectric film.

FIG. 9 shows the connection metal layer 3b of the fourth embodiment. As shown in FIG. 9, in the fourth embodiment, unlike the first to third embodiments, the end portion of the second connection wiring 3b2 connected to the first connection wiring 3b1 extends from the strip-like metal layer 3a in the second direction. is located outside the second side 3a2. The connection metal layer 3b of the dielectric film 1 in the first state and the connection metal layer 3b of the dielectric film 2 in the second state opposite to the first state are symmetrical about the center of one surface of the base film. This embodiment is the same as the first to third embodiments in that they are arranged symmetrically.

A film capacitor according to the fifth embodiment of the present disclosure will be described. 10A to 10C are diagrams showing the configuration of the film capacitor of the fifth embodiment. 10A and 10B are plan views of dielectric films, and FIG. 10C is a schematic cross-sectional view showing a laminated state of films. The film capacitor 11 of this embodiment has

metallikons

5A and 5B on both end surfaces of the film laminate 4 . The film laminate 4 includes a dielectric film (first dielectric film) 1 having a first metal layer 3 on one surface of a base film as shown in FIG. 10A and one surface of the base film as shown in FIG. 10B. , and dielectric films (second dielectric films) 2 having second metal layers 8 are alternately laminated. In this embodiment, unlike the first to fourth embodiments described above, the first metal layer 3 of the dielectric film 1 and the second metal layer 8 of the dielectric film 2 have different structures.

The first metal layer 3 of the dielectric film 1 includes a first common metal layer 3Ac and a second common metal layer 3Bc, and a plurality of first strip-shaped metal layers 3Aa and a plurality of first metal layers 3Aa connected to the first common metal layer 3Ac. It includes a connection metal layer 3Ab, and a plurality of second strip-shaped metal layers 3Ba and a plurality of second connection metal layers 3Bb connected to the second common metal layer 3Bc. The first common metal layer 3Ac and the second common metal layer 3Bc extend in the second direction at the first and second edges of the dielectric film 1 in the first direction, respectively. The first common metal layer 3Ac is electrically connected to the metallikon 5A, and the second common metal layer 3Bc is electrically connected to the metallikon 5B. In this embodiment, the film surface is exposed between the first strip-shaped metal layer 3Aa on the side of the metallikon 5A and the second strip-shaped metal layer 3Ba on the side of the metallikon 5B, and is in an electrically insulated state. there is This exposed film surface serves as a central insulating region Tc continuous along the second direction in the central portion of the dielectric film 1 in the first direction.

The first connection metal layer 3Ab is directly connected to the first common metal layer 3Ac and is directly connected to the first connection wiring 3Ab1 extending in the first direction from the first common metal layer 3Ac and the first connection wiring 3Ab1. , a second connection wiring 3Ab2 extending in the second direction from the first connection wiring 3Ab1, and a second connection wiring 3Ab2 directly connected to the second connection wiring 3Ab2 and extending in the first direction from the second connection wiring 3Ab2 to form the first connection wiring 3Ab2. A third connection wiring 3Ab3 directly connected to the strip-shaped metal layer 3Aa is provided. The first connection metal layer 3Ab having such a structure has a higher electric resistance than the first strip-shaped metal layer 3Aa, and functions as a fuse. In the first connection metal layer 3Ab, the end of the second connection line 3Ab2 connected to the third connection line 3Ab3 is positioned outside the first side 3a1 of the first strip-shaped metal layer 3Aa in the second direction.

The second connection metal layer 3Bb is directly connected to the second common metal layer 3Bc and directly connected to the fourth connection wiring 3Bb1 extending in the first direction from the second common metal layer 3Bc and the fourth connection wiring 3Bb1. , a fifth connection wiring 3Bb2 extending in the second direction from the fourth connection wiring 3Bb1, and a fifth connection wiring 3Bb2 directly connected to the fifth connection wiring 3Bb2. and a sixth connection wiring 3Bb3 directly connected to the strip-shaped metal layer 3Ba. The second connection metal layer 3Bb having such a structure has a higher electrical resistance value than the second strip-shaped metal layer 3Ba, and functions as a fuse. In the second connection metal layer 3Bb, the end of the fifth connection line 3Bb2 connected to the sixth connection line 3Bb3 is located outside the first side 3a1 of the second strip-shaped metal layer 3Ba in the second direction.

11 is an enlarged plan view of the vicinity of the first connection metal layer and the second connection metal layer of the dielectric film 1. FIG. As shown in this enlarged plan view, in the dielectric film 1, the first connection metal layer 3Ab and the second connection metal layer 3Bb are arranged point-symmetrically about the center of one surface of the base film. . That is, when the dielectric film 1 is viewed from above, if the first connection metal layer 3Ab of the dielectric film 1 is rotated by 180° around the target point, it will have the same shape as the second connection metal layer 3Bb.

The second metal layer 8 of the dielectric film 2 is one planar metal layer of a so-called solid pattern. The first edge and the second edge in the first direction of the dielectric film 2 have edge insulating regions T that are continuous in the second direction. The two metal layers 8 are electrically insulated from the

metallikons

5A and 5B.

The film laminate 4 is laminated such that the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba of the first metal layer 3 overlap with the second metal layer 8 in plan view. The film capacitor 11 of this embodiment having such a film laminate 4 can be a series capacitor in which laminated film capacitors are connected in series by the first metal layer 3 and the second metal layer 8 . The film capacitor 11 is composed of a multilayer capacitor composed of the first common metal layer 3Ac, the first strip-like metal layer 3Aa, the first connection metal layer 3Ab on the side of the metallikon 5A, and the second metal layer 8, and the second common metal layer 8 on the side of the metallikon 5B. Layer 3Bc, second strip-shaped metal layer 3Ba and second connection metal layer 3Bb, and the multilayer capacitor formed of second metal layer 8 are connected in series by second metal layer 8. FIG. The film capacitor 11 of this embodiment can achieve a high withstand voltage by using a series capacitor.

In the present embodiment, for example, a plurality of first strip-shaped metal layers 3Aa and a plurality of second strip-shaped metal layers 3Ba overlap one second metal layer 8 in plan view, and the second metal layer 8 serves as the first connection layer. The metal layer 3Ab does not overlap the first common metal layer 3Ac, the second connection metal layer 3Bb, and the second common metal layer 3Bc. In addition, the second metal layer 8 may include a plurality of planar metal layers, and each planar metal layer should overlap the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba in plan view. Just do it.

In the film capacitor 11 of the present embodiment, at least one of the second connection wiring 3Ab2 and the fifth connection wiring 3Bb2 of the dielectric film 1 is cut regardless of the position of the cutting line for cutting the film laminate 4. , and the cutting line, either or both of the second connection wiring 3Ab2 and the fifth connection wiring 3Bb2 are cut, and the first strip-shaped metal layer 3Aa and the first common metal layer 3Ac and the second strip-shaped metal Electrical isolation is provided between the layer 3Ba and/or the second common metal layer 3Bc. Thereby, the discharge at the end surface of the film capacitor 11 can be reduced. Furthermore, since the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba electrically insulated from the first common metal layer 3Ac and the second common metal layer 3Bc are only cut strip-shaped metal layers, the electrostatic The film capacitor 11 can be made with less capacity loss.

A film capacitor according to the sixth embodiment of the present disclosure will be described. 12A to 12C are diagrams showing the configuration of the film capacitor of the sixth embodiment. 12A and 12B are plan views of the dielectric film, and FIG. 12C is a schematic cross-sectional view showing the laminated state of the films. The sixth embodiment differs from the fifth embodiment in the configuration of the first metal layer 3 of the dielectric film 1 and the configuration of the second metal layer 8 of the dielectric film 2, but has other configurations in common. In the fifth embodiment, in the dielectric film 1, the first connection metal layer 3Ab and the second connection metal layer 3Bb are point-symmetrical, whereas the first metal layer 3 in this embodiment is the dielectric film 1 in that the first connection metal layer 3Ab and the second connection metal layer 3Bb are line-symmetrical with respect to the central insulating region Tc. Furthermore, the second metal layer 8 of the dielectric film 2 includes a plurality of strip-shaped metal layers 8 a and a central connection layer 8 b that connects the strip-shaped metal layers 8 a to each other at the central portion of the dielectric film 2 . The plurality of strip-shaped metal layers 8a of the dielectric film 2 are arranged so as to overlap the first strip-shaped metal layers 3Aa and the second strip-shaped metal layers 3Ba of the dielectric film 1 in plan view. For example, one strip-shaped metal layer 8a may be arranged for one first strip-shaped metal layer 3Aa, and one strip-shaped metal layer 8a may be arranged for one second strip-shaped metal layer 3Ba. The central connection layer 8b connects, for example, the strip-shaped metal layer 8a corresponding to the first strip-shaped metal layer 3Aa and the strip-shaped metal layer 8a corresponding to the second strip-shaped metal layer 3Ba. connect the sides of The central connection layer 8b has a higher electrical resistance than the strip-shaped metal layer 8a and functions as a fuse. The film capacitor 11 of this embodiment can achieve a high withstand voltage by forming a series capacitor with the first metal layer 3 and the second metal layer 8 as described above.

In the film capacitor 11 of the present embodiment, the second connection wiring 3Ab2 and the fifth connection wiring 3Bb2 of the dielectric film 1 are cut by the cutting lines cut in the film laminate 4. FIG. Here, since the first connection metal layer 3Ab and the second connection metal layer 3Bb are line-symmetrical with respect to the central insulating region Tc, for example, the third connection wiring 3Ab3 and the sixth connection wiring 3Bb3 are located on the same side, and if the cutting line passes through the third connection wiring 3Ab3 and the sixth connection wiring 3Bb3, the first strip-shaped metal layer 3Aa and the first common metal layer 3Ac and the second There is a possibility that the strip-like metal layer 3Ba and the second common metal layer 3Bc are not electrically insulated. Even in such a case, the second metal layer 8 is insulated by cutting the strip-like metal layers 8a connected by the central connection layer 8b, so that the discharge at the end face of the film capacitor 11 can be reduced. Furthermore, since the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba electrically insulated from the first common metal layer 3Ac and the second common metal layer 3Bc are only cut strip-shaped metal layers, the electrostatic The film capacitor 11 can be made with less capacity loss.

The first connection metal layer 3Ab and the second connection metal layer 3Bb of the fifth and sixth embodiments may all have the same configuration as the connection metal layer 3b of the above-described second to fourth embodiments.

FIG. 13 is an external perspective view showing a modification of the film capacitor. Film capacitor A is obtained by covering film capacitor 10 with exterior member 7 in terms of insulation and environmental resistance.

Metallicons

5A and 5B have lead wires 6 for external connection. FIG. 13 shows a state in which a part of the exterior member 7 is removed, and the removed portion of the exterior member 7 is indicated by a broken line.

FIG. 14 is a perspective view schematically showing the configuration of a coupled capacitor. In FIG. 14, the case and the molding resin are omitted in order to make the configuration easier to understand. The coupled capacitor B has a configuration in which a plurality of film capacitors A are connected in parallel by a pair of

bus bars

21 and 23 . The

busbars

21 and 23 are composed of

terminal portions

21a and 23a and lead

terminal portions

21b and 23b. The

terminal portions

21a and 23a are for external connection, and the lead

terminal portions

21b and 23b are connected to the

external electrodes

5A and 5B of the film capacitor A, respectively.

FIG. 15 is a schematic configuration diagram for explaining the configuration of the inverter. FIG. 15 shows an example of an inverter C that generates alternating current from rectified direct current. The inverter C of this embodiment includes a bridge circuit 31 and a capacitor section 33, as shown in FIG. The bridge circuit 31 is composed of, for example, switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and diodes. The capacitive section 33 is arranged between the input terminals of the bridge circuit 31 and stabilizes the voltage. The inverter C may include the film capacitors 10 and A or the coupled capacitor B as the capacitive section 33 .

The input of this inverter C may be connected to the booster circuit 35 for boosting the voltage of the DC power supply or may be connected to the DC power supply. On the other hand, the bridge circuit 31 is connected to a motor generator (motor M) as a drive source.

FIG. 16 is a schematic configuration diagram for explaining the configuration of the electric vehicle. FIG. 16 shows an example of a hybrid electric vehicle (HEV) as the electric vehicle D. As shown in FIG.

An electric vehicle D in FIG. 16 includes a driving motor 41, an engine 43, a transmission 45, an inverter 47, a power supply (battery) 49, front wheels 51a and rear wheels 51b.

This electric vehicle D has a motor 41, an engine 43, or both as a drive source. The output of the drive source is transmitted via the transmission 45 to the pair of left and right front wheels 51a. The power supply 49 is connected to the inverter 47 and the inverter 47 is connected to the motor 41 .

Also, the electric vehicle D shown in FIG. 16 includes a vehicle ECU 53 and an engine ECU 57 . The vehicle ECU 53 performs overall control of the electric vehicle D as a whole. The engine ECU 57 drives the electric vehicle D by controlling the rotation speed of the engine 43 . The electric vehicle D further includes driving devices such as an ignition key 55 operated by the driver or the like, an accelerator pedal (not shown), and a brake. A vehicle ECU receives a driving signal according to the operation of the driving device by the driver or the like. The vehicle ECU 53 outputs an instruction signal to the engine ECU 57, the power supply 49, and the inverter 47 as a load based on the drive signal. The engine ECU 57 drives the electric vehicle D by controlling the rotation speed of the engine 43 in response to the instruction signal. An inverter C in which the film capacitors A and 10 or the coupled capacitor B of the present embodiment are applied as the capacitance section 33 can be mounted on an electric vehicle D as shown in FIG. 16 .

It should be noted that the inverter C of this embodiment can be applied not only to the hybrid electric vehicle (HEV) described above, but also to various power conversion application products such as electric vehicles (EV), electric bicycles, generators, and solar cells.

The present disclosure enables the following embodiments.

In the film capacitor of the present disclosure, a metal layer is provided on one surface, and a first edge in a first direction of the one surface and an edge continuous in a second direction orthogonal to the first direction A rectangular parallelepiped film laminate in which a plurality of dielectric films having an insulating region are laminated, and in a first state in which the orientations are reversed so that the positions of the edge insulating regions in a plan view overlap with each other. a film laminate obtained by laminating a dielectric film and a dielectric film in a second state; and a first metal electrode and a second metal electrode, wherein the metal layer electrically connected to the first metal electrode has a second edge in the first direction of the one surface, the a common metal layer extending in a second direction; a plurality of strip-shaped metal layers extending in the first direction and electrically connected to the common metal layer; and connecting the common metal layer and the strip-shaped metal layers. a connection metal layer, the connection metal layer being directly connected to the common metal layer and extending in the first direction from the common metal layer; and a first connection line. and extending in the second direction from the first connection wiring; and a second connection wiring directly connected to the second connection wiring and extending in the first direction from the second connection wiring. and a third connection wiring directly connected to the strip-shaped metal layer, wherein an end of the second connection wiring connected to the third connection wiring extends along the first side of the strip-shaped metal layer in the second direction. and the connection metal layer of the dielectric film in the first state and the connection metal layer of the dielectric film in the second state are arranged point-symmetrically about the center of the one surface. ing.

In the film capacitor of the present disclosure, a first metal layer is provided on one surface, and the first metal layer is provided on a first edge of the one surface in a first direction, and a second metal layer perpendicular to the first direction. a first common metal layer continuously positioned along the direction of and a second edge of the one surface in the first direction, and a second a first dielectric film having a common metal layer; and a second metal layer disposed on one side, and the first edge and the second edge of the one side in a first direction, respectively. and a second dielectric film having an edge insulating region continuous along a second direction orthogonal to the direction perpendicular to the second direction. a film laminate laminated such that a part of a layer and a part of the second metal layer overlap; a first metal electrode and a second metal electrode electrically connected to layers, the first metal layer extending in the first direction and electrically connected to the first common metal layer. a plurality of first strip-shaped metal layers; a plurality of second strip-shaped metal layers extending in the first direction and electrically connected to the second common metal layer; the first common metal layer and the first strip-shaped a first connection metal layer connecting the metal layers; and a second connection metal layer connecting the second common metal layer and the second strip-shaped metal layer, wherein the second metal layer a planar metal layer electrically insulated from the first metal electrode and the second metal electrode by a partial insulating region, the first connection metal layer being directly connected to the first common metal layer, the first a first connection wire extending from a common metal layer in the first direction; and a second connection directly connected to the first connection wire and extending from the first connection wire in the second direction. and a third connection wiring that is directly connected to the second connection wiring, extends from the second connection wiring in the first direction, and is directly connected to the first strip-shaped metal layer, and the second connection. The metal layer is directly connected to the second common metal layer, and extends from the second common metal layer in the first direction. a fifth connection wiring extending from the connection wiring in the second direction; and the second strip-shaped metal that is directly connected to the fifth connection wiring and extends in the first direction from the fifth connection wiring. and a sixth connection wiring directly connected to the layer, wherein an end of the second connection wiring connected to the third connection wiring extends in the second direction. An end portion of the fifth connection wiring located outside the first side edge of the first strip-shaped metal layer and connected to the sixth connection wiring is located on the first side of the second strip-shaped metal layer in the second direction. The first connection metal layer and the second connection metal layer are positioned outside the side and arranged point-symmetrically about the center of the one surface of the first dielectric film.

According to the present disclosure, even if the film laminate is cut in a predetermined direction, it is possible to provide a laminated film capacitor that reduces discharge at the cut portion and has little capacitance loss.

According to the present disclosure, it is possible to provide a coupled capacitor, an inverter, and an electric vehicle using a film capacitor with little capacitance loss.

Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications, improvements, etc. can be made without departing from the gist of the present disclosure. It is possible. It goes without saying that all or part of each of the above-described embodiments can be appropriately combined within a non-contradictory range.

1 Dielectric film (first dielectric film)
2 Dielectric film (second dielectric film)
3 metal layer (first metal layer)
3Aa First strip-shaped metal layer 3Ab First connection metal layer 3Ab1 First connection wire 3Ab2 Second connection wire 3Ab3 Third connection wire 3Ac First common metal layer 3Ba Second strip-shaped metal layer 3Bb Second connection metal layer 3Bb1 Fourth connection wire 3Bb2 fifth connection wiring 3Bb3 sixth connection wiring 3Bc second common metal layer 3a strip-like metal layer 3b connection metal layer 3b1 first connection wiring 3b2 second connection wiring 3b3 third connection wiring 3c common metal layer 4 film laminate 5A metallikon ( first metal electrode)
5B metallikon (second metal electrode)
6 lead wire 7 exterior member 8 second metal layer 8a strip-shaped metal layer 8b

central connection layer

10, 11 film capacitor 12 insulating layer 21 bus bar 21a terminal portion 21b lead terminal portion 31 bridge circuit 33 capacitance portion 35 booster circuit 3a1 first side 3a2 second side 41 motor 43 engine 45 transmission 47 inverter 49 power supply 51a front wheel 51b rear wheel 53 vehicle ECU
55 Ignition key 57 Engine ECU
A Film capacitor B Concatenated capacitor C Inverter D Electric vehicle E Electric vehicle M Motor S Insulation margin T Edge insulation area Tc Central insulation area

Claims

A dielectric film having a metal layer disposed on one surface and having, on a first edge of the one surface in a first direction, an edge insulating region continuous along a second direction perpendicular to the first direction. is a rectangular parallelepiped film laminate in which a plurality of are laminated, wherein the dielectric film in the first state and the dielectric film in the second state are opposite in orientation so that the positions of the edge insulating regions in a plan view overlap with each other a film laminate obtained by laminating a dielectric film of
a first metal electrode and a second metal electrode located on each of a pair of end faces in the first direction of the film laminate and electrically connected to the metal layer;
The metal layer electrically connected to the first metal electrode,
a common metal layer extending in the second direction and provided at a second edge of the one surface in the first direction;
a plurality of strip-shaped metal layers extending in the first direction and electrically connected to the common metal layer;
a connection metal layer connecting the common metal layer and the strip-shaped metal layer;
The connection metal layer is
a first connection wiring directly connected to the common metal layer and extending from the common metal layer in the first direction;
a second connection wiring directly connected to the first connection wiring and extending in the second direction from the first connection wiring;
a third connection wiring that is directly connected to the second connection wiring, extends from the second connection wiring in the first direction, and is directly connected to the strip-shaped metal layer;
an end portion of the second connection wiring connected to the third connection wiring is positioned outside the first side of the strip-shaped metal layer in the second direction;
A film capacitor in which the connection metal layers of the dielectric film in the first state and the connection metal layers of the dielectric film in the second state are arranged point-symmetrically about the center of the one surface.
2. An end portion of said second connection wiring connected to said first connection wiring is located inside a second side of said strip-shaped metal layer opposite to said first side in said second direction. A film capacitor as described.
3. The film capacitor according to claim 1, wherein said second connection wiring has a meandering shape.
A first metal layer is disposed on one surface, and the first metal layer is continuous along a second direction orthogonal to the first direction to a first edge of the one surface in a first direction. and a second common metal layer continuously positioned along the second direction at a second edge of the one surface in the first direction. 1 dielectric film;
A second metal layer is disposed on one surface, and is continuous along a second direction perpendicular to the first direction on each of the first edge portion and the second edge portion in the first direction of the one surface. a second dielectric film having an edge insulating region; A film laminate laminated so that the
a first metal electrode and a second metal electrode located on each of a pair of end surfaces of the film laminate in the first direction and electrically connected to the first metal layer;
The first metal layer is
a plurality of first strip-shaped metal layers extending in the first direction and electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending in the first direction and electrically connected to the second common metal layer;
a first connection metal layer connecting the first common metal layer and the first strip-shaped metal layer;
a second connection metal layer connecting the second common metal layer and the second strip-shaped metal layer;
The second metal layer is
a planar metal layer electrically insulated from the first metal electrode and the second metal electrode by the edge insulation region;
The first connection metal layer is
a first connection wiring directly connected to the first common metal layer and extending in the first direction from the first common metal layer;
a second connection wiring directly connected to the first connection wiring and extending in the second direction from the first connection wiring;
a third connection wiring that is directly connected to the second connection wiring, extends from the second connection wiring in the first direction, and is directly connected to the first strip-shaped metal layer;
The second connection metal layer is
a fourth connection wiring directly connected to the second common metal layer and extending from the second common metal layer in the first direction;
a fifth connection wiring directly connected to the fourth connection wiring and extending in the second direction from the fourth connection wiring;
a sixth connection wiring that is directly connected to the fifth connection wiring, extends from the fifth connection wiring in the first direction, and is directly connected to the second strip-shaped metal layer;
an end portion of the second connection wiring connected to the third connection wiring is positioned outside the first side edge of the first strip-shaped metal layer in the second direction;
an end portion of the fifth connection wiring connected to the sixth connection wiring is positioned outside the first side edge of the second strip-shaped metal layer in the second direction;
A film capacitor, wherein the first connection metal layer and the second connection metal layer are arranged point-symmetrically about the center of the one surface of the first dielectric film.
comprising a plurality of film capacitors and a bus bar connecting the plurality of film capacitors,
A coupled capacitor, wherein the film capacitor comprises the film capacitor according to any one of claims 1-4.
comprising a bridge circuit composed of switching elements and a capacitor connected to the bridge circuit,
An inverter, wherein the capacitive section includes the film capacitor according to any one of claims 1 to 4.
A power supply, an inverter connected to the power supply, a motor connected to the inverter, and wheels driven by the motor,
An electric vehicle, wherein the inverter is the inverter according to claim 6 .