WO2022270391A1

WO2022270391A1 - Film capacitor, combined capacitor, inverter and electric vehicle

Info

Publication number: WO2022270391A1
Application number: PCT/JP2022/024027
Authority: WO
Inventors: 耕世神垣
Original assignee: 京セラ株式会社
Priority date: 2021-06-24
Filing date: 2022-06-15
Publication date: 2022-12-29
Also published as: JPWO2022270391A1

Abstract

According to the present invention, a first metal layer comprises: a plurality of first band-like metal layers that extend toward a second common metal layer along a first direction, while being electrically connected to a first common metal layer; and a plurality of second band-like metal layers that extend toward the first common metal layer along the first direction, while being electrically connected to the second common metal layer. Meanwhile, a second metal layer is a rectangular planar metal layer which is electrically insulated from a first metal electrode and a second metal electrode by means of a peripheral insulating region; and with respect to the second metal layer, the length in the first direction is shorter than the length of the first band-like metal layers in the first direction, the length in the first direction is shorter than the length of the second band-like metal layers in the first direction, and the entire length in the first direction overlaps with respective middle portions of the first band-like metal layers and the second band-like metal layers in the first direction.

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.

WO2019/069624

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. and a second common metal layer continuously provided along the second direction on a second edge of the one surface in the first direction. a first dielectric film having a metal layer; and a second metal layer disposed on one side, and a first edge and a second edge of the one side in a first direction, respectively, in the first direction. A cylindrical film roll in which a second dielectric film provided with a continuous edge insulating region along a second direction orthogonal to the second direction is laminated, wherein the first metal layer in plan view A film roll wound such that a portion of the and a portion of the second metal layer overlap;
a first metal electrode and a second metal electrode formed on each of a pair of end surfaces of the film roll 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a rectangular planar metal layer in which the first metal electrode and the second metal electrode are electrically isolated by the edge insulation region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. , and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.

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. and a second common metal layer continuously provided along the second direction on a second edge of the one surface in the first direction. a first dielectric film having a metal layer; and a second metal layer disposed on one side, and a first edge and a second edge of the one side in a first direction, respectively, in the first direction. A rectangular parallelepiped film laminate in which a second dielectric film provided with a continuous edge insulating region along a second direction orthogonal to the A film laminate laminated so that a part and a part of the second metal layer overlap,
a first metal electrode and a second metal electrode formed 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a rectangular planar metal layer in which the first metal electrode and the second metal electrode are electrically isolated by the edge insulation region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. , and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.

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.

4 is a plan view of a first dielectric film of the film capacitor of the first embodiment; FIG. 4 is a plan view of a second dielectric film of the film capacitor of the first embodiment; FIG. It is the top view which looked at the film capacitor of 1st Embodiment from the upper part. It is a cross-sectional schematic diagram which shows the laminated state of each film. 4 is an enlarged plan view of the vicinity of a connection metal layer of a dielectric film; FIG. 4 is a plan view of a first dielectric film of another example of the first embodiment; FIG. FIG. 5 is a plan view of a second dielectric film of another example of the first embodiment; FIG. 6 is a top plan view of another example of the film capacitor of the first embodiment; FIG. 6 is a schematic cross-sectional view showing a lamination state of each film in another example of the first embodiment; FIG. 8 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film of another example of the first embodiment; 2 is an exploded perspective view showing a laminated state (before cutting) of dielectric films of the first embodiment; FIG. FIG. 2 is an external perspective view showing the configuration of the film laminate after being cut in the first embodiment; FIG. 3 is an external perspective view showing the configuration after thermal spraying of the metal electrode of the first embodiment; FIG. 10 is a partially cutaway perspective view of a film capacitor of another example; 1 is a perspective view schematically showing the configuration of a coupled capacitor; FIG. FIG. 3 is an electric circuit diagram for explaining the configuration of an inverter; 1 is a schematic configuration diagram for explaining the configuration of an electric vehicle; FIG. It is the top view which looked at the film capacitor of 2nd Embodiment. It is the top view which looked at the film capacitor of 3rd Embodiment. It is the top view which looked at the film capacitor of 4th Embodiment. It is the top view which looked at the film capacitor of 5th Embodiment. It is the top view which looked at the film capacitor of 6th Embodiment. FIG. 12 is a plan view of the film capacitor of the seventh embodiment as viewed from above;

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

In conventional film capacitors, aluminum, which is highly resistant to moisture, is widely used as vapor-deposited electrodes. , describes an invention in which electric field concentration tends to occur at the boundary between a vapor deposition electrode portion and a non-electrode portion when a voltage is applied to a film capacitor, and the problem is to suppress a decrease in capacitance due to oxidation of the vapor deposition electrode.

In the invention described in Patent Document 1, it is possible to suppress the decrease in capacitance due to the oxidation of the deposition electrode, but the series capacitor due to the non-uniformity of the area between the cells has the capacitance of each capacitor cell connected in series. are ideally equal. If there is a difference in the capacitance of the capacitor cells, the effective voltage applied to each capacitor cell will vary. Each capacitor cell is made of a common dielectric material and has a common thickness. Shorter cell life.

An object of the present invention is to provide a highly reliable series capacitor in which differences in capacitance between capacitor cells are unlikely to occur.

The multilayer film capacitor of the first embodiment of the present disclosure will be described below with reference to the drawings. 1A and 1B are plan views of the first dielectric film and the second dielectric film, respectively; FIG. 1C is a plan view of the film capacitor viewed from above; and FIG. is. FIG. 2 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film.

The laminated film capacitor 10 of this embodiment comprises a first dielectric film 1 having a first metal layer 3 on one surface of a base film and a second dielectric film 2 having a second metal layer 8 on one surface of the base film. are laminated alternately.

The first metal layer 3 is a so-called comb-shaped metal layer, and includes a first strip-shaped metal layer 3Aa, a second strip-shaped metal layer 3Ba, a first connection metal layer 3Ab, a second connection metal layer 3Bb, and a first metal layer 3Bb. It includes a common metal layer 3Ac and a second common metal layer 3Bc. The first strip-shaped metal layer 3Aa, the first connection metal layer 3Ab, and the first common metal layer 3Ac constitute the first metal layer 3A. The second strip-shaped metal layer 3Ba, the second connection metal layer 3Bb, and the second common metal layer 3Bc constitute the first metal layer 3B. The first strip-shaped metal layer 3Aa is electrically connected to the first common metal layer 3Ac through the first connection metal layer 3Ab, and the second strip-shaped metal layer 3Ba is connected through the second connection metal layer 3Bb. , are electrically connected to the second common metal layer 3Bc. The first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba become the internal electrodes of the capacitor after lamination.

Organic resin materials such as polypropylene, polyethylene terephthalate, polyarylate, and cycloolefin polymer are used as constituent materials of the base films of the first dielectric film 1 and the second dielectric film 2 .

The first strip-shaped metal layer 3Aa, the second strip-shaped metal layer 3Ba on the surface of the first dielectric film 1, and the metal layer 8 on the surface of the second dielectric film 2 are formed by metal vapor deposition on the base film. The first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba extend linearly along the first direction.

In each figure, the direction in which the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba formed parallel to each other extend is called the first direction, and the direction in which the parallel strip-shaped metal layers 3Aa and 3Ba are arranged is called the first direction. 2 direction. The lamination direction of the first dielectric film 1 and the second dielectric film 2 is the third direction (z direction in the figure) orthogonal to the first direction (x direction in the figure) and the second direction (y direction in the figure). is.

Thus, the film capacitor 10 of the present disclosure is a rectangular parallelepiped film laminate 4 in which the first dielectric film 1 and the second dielectric film 2 are laminated, and the first metal layer 3 and a portion of the second metal layer 8 are laminated so as to overlap each other. The first dielectric film 1 is provided with a first metal layer 3 on one surface, and the first metal layer 3 is provided on a first edge of the first direction of the one surface in a second direction orthogonal to the first direction. a first common metal layer 3Ac continuously provided along the direction of , and a second common metal layer 3Ac provided continuously along the second direction on the second edge of the one surface in the first direction layer 3Bc. A second metal layer 8 is disposed on one surface of the second dielectric film 2, and a first edge portion and a second edge portion in the first direction of the one surface are provided with a metal layer perpendicular to the first direction. A continuous edge insulation region T is provided along a second direction that extends along the edge. Further, the film capacitor 10 includes a first metal electrode (metallicon) 5A and a second metal electrode (metallicon) 5A formed on each of a pair of end faces in the first direction of the film laminate 4 and electrically connected to the first metal layer 3. and an electrode (metallikon) 5B.

The first metal layer 3 includes a plurality of first strip-shaped metal layers 3Aa extending along the first direction toward the second common metal layer 3Bc in a state of being electrically connected to the first common metal layer 3Ac; and a plurality of second strip-shaped metal layers 3Ba extending in the first direction toward the first common metal layer 3Ac while being electrically connected to the second common metal layer 3Bc.

The second metal layer 8 is a rectangular planar metal layer electrically insulated from the first metal electrode 5A and the second metal electrode 5B by the edge insulating region T, and the length in the first direction is It is shorter than the length in the first direction of the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba, and the total length in the first direction is the first direction length of the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba. overlaps with the intermediate portion 71 of the .

The plurality of first strip-shaped metal layers 3Aa and the plurality of second strip-shaped metal layers 3Ba are rectangular with the same shape and size when viewed from above. The first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba are arranged side by side in the second direction at regular intervals with the long sides 72 facing the first direction. Even if the second metal layer 8 is displaced in the first direction with respect to the first metal layer 3, the pair of long sides 72 of the second metal layer 8 are aligned with the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Aa. If it is located in the intermediate portion 71 between the pair of short sides 73 of 3Ba, the overlapping area of the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba and the second metal layer 8 does not change. For this reason, the capacitor formed by overlapping the first strip-shaped metal layer 3Aa and the second metal layer 8 and the capacitor formed by overlapping the second strip-shaped metal layer 3Ba and the second metal layer 8 are electrostatically charged. It is possible to suppress the occurrence of a difference in capacity.

The first metal layer 3 includes a first connection metal layer 3Ab connecting the first common metal layer 3Ac and the first strip-shaped metal layer 3Aa, and a second connection metal layer 3Ab connecting the second common metal layer 3Bc and the second strip-shaped metal layer 3Ba. It further has two connection metal layers 3Bb.

As shown in FIGS. 1A to 1D and 2, the first connection metal layer 3Ab is directly connected to the first common metal layer 3Ac and extends in the first direction from the first common metal layer 3Ac. A connection wiring 3Ab1 is directly connected to the first connection wiring 3Ab1, and a second connection wiring 3Ab2 extending in the second direction from the first connection wiring 3Ab1 is directly connected to the second connection wiring 3Ab2. and a third connection wiring 3Ab3 extending in the first direction from 3Ab2 and directly connected to the first strip-shaped metal layer 3Aa.

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 first connection wiring 3Bb1, and a fifth connection wiring 3Bb2 directly connected to the fifth connection wiring 3Bb2, and extending in the first direction from the fifth connection wiring 3Bb2 to the second connection wiring 3Bb2. and a sixth connection wiring 3Bb3 directly connected to the strip-shaped metal layer 3Ba. In this embodiment, the second connection metal layer 3Bb is located at a position obtained by rotating the first connection metal layer 3Ab by 180° around the central portion of the first connection metal layer 3Ab in the x direction.

The first connection wiring 3Ab1, the second connection wiring 3Ab2, and the third connection wiring 3Ab3 provided in the first connection metal layer 3Ab have a narrower current path than the first strip-shaped metal layer 3Aa, and the second connection metal layer 3Bb The fourth connection wiring 3Bb1, the fifth connection wiring 3Bb2, and the sixth connection wiring 3Bb3, which are provided, have narrower current paths than the second strip-shaped metal layer 3Ba. The second connection metal layer 3Bb functions as a fuse.

Even if the dielectric film 1 breaks down, the fuse pattern scatters and the short circuit can be cut off, so the film capacitor 10 can have a long life and high reliability.

The length L of the second connection wiring 3Ab2 in the second direction is greater than the width W of the first strip-shaped metal layer 3Aa. The length L in the second direction is the projected length of the second connection metal layer 3Bb in the first direction. That is, the end portion of the second connection wiring 3Ab2 on the side connected to the first connection wiring 3Ab1 is located outside in the width direction of the strip-shaped metal layer 3Aa and is connected to the third connection metal layer 3Ab3 of the second connection wiring 3Ab2. The side end is positioned outward in the width direction of the strip-shaped metal layer 3Aa in the second direction. The first connection wiring 3b1 and the third connection metal layer 3b3 are also located outside the strip-shaped metal layer 3a in the width direction. The third connection metal layer 3b3, for example, extends in the first direction from the second connection metal layer 3b2 and directly joins the side edge of the strip-shaped metal layer 3a extending along the first direction.

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 it is not always at the same position in the width direction of the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba. Since the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba that have been cut are exposed at the end face in the second direction (y-direction) of the film capacitor 10, the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba are cut. However, if the first common metal layer 3Ac and the second common metal layer 3Bc are electrically connected to each other even after cutting, a voltage is applied to the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba during use, and the end faces Discharge. By the first connection metal layer 3Ab and the second connection metal layer 3Bb as in the present embodiment, the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba and the first common metal layer 3Ac and the second common metal layer 3Bc are connected. When connected, the second connection metal layers 3Ab2 and 3Bb2 intersect with the cutting line regardless of the position of the cutting line, so the second connection metal layers 3Ab2 and 3Bb2 are cut, and the first strip metal The layer 3Aa and the second strip-shaped metal layer 3Ba are electrically insulated from the first common metal layer 3Ac and the second common metal layer 3Bc. Thereby, the discharge at the end surface of the film capacitor 10 can be reduced. Furthermore, 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, i. Since the metal layer 3Aa and the second strip-shaped metal layer 3Ba are only the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba that have been cut, the film capacitor 10 can have a small capacitance loss.

FIGS. 3A to 3D are diagrams showing other examples of the film capacitor of the first embodiment, FIGS. 3A and 3B are plan views of the first dielectric film and the second dielectric film, respectively, and FIG. 3C. is a plan view of the film capacitor as seen from above, and FIG. 3D is a cross-sectional schematic diagram showing the laminated state of each film. FIG. 4 is an enlarged plan view of the vicinity of the connection metal layer of the dielectric film.

The positional relationship between the first connection metal layer 3Ab and the second connection metal layer 3Bb is not limited to that shown in FIGS. 1A to 1D. In the case where the second connection metal layer 3Bb is located symmetrically with respect to the straight line in the y direction passing through the center of the first connection metal layer 3Ab in the x direction, it is similar to the film capacitor shown in FIGS. 1A to 1D and 2. effect.

Although the laminated film capacitor has been described above, the wound film capacitor includes a cylindrical film wound body in which a first dielectric film and a second dielectric film are wound. Although different from a laminated film capacitor including a rectangular parallelepiped film laminate in which a dielectric film and a second dielectric film are laminated, the present disclosure applies not only to laminated film capacitors but also to wound film capacitors. It is possible to

Here, a method for manufacturing the laminated film capacitor 10 will be described. FIG. 5 is an exploded perspective view showing a laminated state of dielectric films (before cutting), and FIG. 6 is an external perspective view showing the configuration of the film laminate after cutting. FIG. 7 is an external perspective view showing the configuration after thermal spraying of the metal electrode.

First, as shown in FIG. 5, a plurality of first strip-shaped metal layers 3Aa and second strip-shaped metal layers 3Ba extending in the x-direction and first common metal layers 3Ac and second strip-shaped metal layers 3Ba extending in the y-direction are formed on the surface of the film. A plurality of first dielectric films 1 having two common metal layers 3Bc and second dielectric films 2 having second electrode metal layers 8 are stacked so that the edge insulating regions T overlap alternately in plan view. to laminate.

As a method of lamination, conventionally known methods can be used, such as stacking the long first and second

dielectric films

1 and 2 and winding them around a cylinder or a cylinder with a polygonal cross section. A virtual line (a two-dot chain line) in FIG. 5 indicates a cutting line after winding on a cylinder or the like.

FIG. 6 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. 6, the first dielectric film 1 and the second dielectric film 2, which are vertically adjacent to each other, are laminated with their positions slightly shifted in the x direction (offset state). The first common metal layer 3Ac and the second common metal layer 3Bc are exposed on both end surfaces of the laminate 4 in the x direction. As shown in FIG. 6, the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba exposed at the cut surface of the film laminate 4 are obtained by cutting the first connection metal layer 3Ab and the second connection metal layer 3Bb. , and is not connected to the first common metal layer 3Ac and the second common metal layer 3Bc, and is electrically insulated from the first common metal layer 3Ac and the second common metal layer 3Bc.

On the upper surface of the film laminate 4, an insulating layer 12, such as a base film on which the metal layer 3 is not formed, may be laminated as a protective layer of the film laminate 4. The insulating layer 12 may be omitted.

Next, as shown in FIG. 7, metal thermal spraying is applied to both end surfaces of the film laminate 4 in the x direction where the first common metal layer 3Ac and the second common metal layer 3Bc are exposed. A metal electrode and a second metal electrode (

metallicon

5A, 5B) are formed. As a result, the first strip-shaped metal layer 3Aa and the second strip-shaped metal layer 3Ba on the first and second

dielectric films

1 and 2 are connected to either the

metallikon

5A or 5B. It is electrically connected through the metal layer 3Ba and functions as an internal electrode of the film capacitor 10. FIG.

FIG. 8 is a partially cutaway perspective view of another embodiment of a film capacitor of another example. Film capacitor A is obtained by covering film capacitor 10 with exterior member 7 in terms of insulation and environmental resistance. The

metallikons

5A and 5B are provided with lead wires 6 for external connection. FIG. 8 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. 9 is a perspective view schematically showing the configuration of a coupled capacitor. In FIG. 9, 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. 10 is an electric circuit diagram for explaining the configuration of the inverter. FIG. 10 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. 11 is a schematic configuration diagram for explaining the configuration of the electric vehicle. FIG. 11 shows an example of a hybrid electric vehicle (HEV) as the electric vehicle D. As shown in FIG.

An electric vehicle D in FIG. 11 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. 11 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. The vehicle ECU 53 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 using the film capacitors A and 10 or the coupled capacitor B of the present embodiment as the capacitance section 33 can be mounted on an electric vehicle D as shown in FIG. 11 .

Note that the inverter C of this embodiment can be applied not only to the hybrid electric vehicle (HEV) described above, but also to electric vehicles (EV), electric bicycles, generators, solar cells, and various other power conversion products.
A multilayer film capacitor according to a second embodiment of the present disclosure will be described below with reference to the drawings.

FIG. 12 is a top plan view of the film capacitor 100 of the second embodiment. A film capacitor 100 of the second embodiment will be described. The same reference numerals are used for the parts corresponding to those of the first embodiment.

The first strip-shaped metal layer 61 has a base end connected to the first common metal layer 3Ac via a fuse 82, and a tip opposite to the base end. The second strip-shaped metal layer 62 has a base end connected to the second common metal layer 3Bc via a fuse 82 and a tip opposite to the base end.

The planar metal layer 75 is a first planar metal layer having a first overlapping portion 76 overlapping the base end portion of the first strip-shaped metal layer 61 and a second overlapping portion 77 overlapping the distal end portion of the second strip-shaped metal layer 62. a second planar metal layer 80 having a layer 78, a third overlapping portion 79 overlapping the tip portion of the first strip-shaped metal layer 61, and a fourth overlapping portion 81 overlapping the base end portion of the second strip-shaped metal layer 62; have

In this embodiment, when dielectric breakdown occurs in any one of the four capacitors consisting of the first strip-shaped metal layer 61 and the second strip-shaped metal layer 62 and the first planar metal layer 78 and the second planar metal layer 80 , the fuse 82 is cut off, and the series capacitor unit portions (the first overlapping portion 76 and the second overlapping portion 77, and the third overlapping portion 79 and the fourth overlapping portion 81) consisting of four capacitors are electrically isolated, and this It is possible to maintain the electrical insulation of the capacitor, which is an aggregate of the series capacitor unit portions.

FIG. 13 is a top plan view of the film capacitor 110 of the third embodiment. A film capacitor 110 according to the third embodiment will be described. The same reference numerals are used for parts corresponding to the description of the first embodiment.

According to this embodiment, when dielectric breakdown occurs in the overlapping portion, the fuse 82 connected to the overlapping portion where the dielectric breakdown has occurred is cut off. As a result, the capacitor unit portion (the first overlapping portion 76 and the second overlapping portion 77 or the third overlapping portion 79 and the fourth overlapping portion 81) in which dielectric breakdown has occurred is electrically isolated, and the electrical insulation of the capacitor is maintained. can do.

FIG. 14 is a top plan view of the film capacitor of the fourth embodiment. A film capacitor 120 of the fourth embodiment will be described. The same reference numerals are used for parts corresponding to the description of the first embodiment.

A portion of the first strip-shaped metal layer 61 on which the first overlapping portion 76 overlaps and a portion of the first strip-shaped metal layer 61 on which the third overlapping portion 79 overlaps is connected via a fuse 82. The portion of the second strip-shaped metal layer 62 on which the second overlapping portion 77 overlaps and the portion of the second strip-shaped metal layer 62 on which the fourth overlapping portion 81 overlaps are located near the base end of the second strip-shaped metal layer 62 . connected through

According to the present embodiment, the capacitor unit portion comprising the first strip-shaped metal layer 61, the second strip-shaped metal layer 62, the first overlapping portion 76, the second overlapping portion 77, the third overlapping portion 79, and the fourth overlapping portion 81 When a dielectric breakdown occurs in any capacitor, the fuse 82 that connects the first overlapping portion 76 and the third overlapping portion 79 and the second overlapping portion 77 and the fourth overlapping portion 81 in series is cut off. As a result, any one of the first overlapping portion 76 and the second overlapping portion 77 and the third overlapping portion 79 and the fourth overlapping portion 81, which are two series-connected capacitor units electrically connected in parallel, or Both are electrically isolated and can maintain the electrical isolation of the capacitor.

FIG. 15 is a top plan view of the film capacitor 130 of the fifth embodiment. A film capacitor 130 of the fifth embodiment will be described. The same reference numerals are used for the parts corresponding to those of the first embodiment.

According to the present embodiment, the first overlapping portion 76 overlapping the portion of the first strip-shaped metal layer 61 closer to the proximal end portion and the second overlapping portion 77 overlapping the portion closer to the distal end portion of the second strip-shaped metal layer 62 are formed. A third overlapping portion 79, which is connected via a fuse 82 and overlaps a portion of the first strip-shaped metal layer 61 closer to the tip, and a fourth overlapping portion overlaps a portion of the second strip-shaped metal layer 62 closer to the base. 81 are connected through a fuse 82 . Furthermore, the portion of the first strip-shaped metal layer 61 that overlaps with the first overlapping portion 76 near the base end portion and the portion of the first strip-shaped metal layer 61 that overlaps with the third overlapping portion 79 near the tip end portion are connected via the fuse 82 . The portion near the distal end portion of the second strip-shaped metal layer 62 where the second overlapping portion 77 overlaps and the portion near the base end portion of the second strip-shaped metal layer 62 where the fourth overlapping portion 81 overlaps are connected by It is connected through a fuse 82 .

According to this embodiment, the overlapping portion forming the capacitor unit in which dielectric breakdown occurred, or the fuse 82 connected to the first strip-shaped metal layer 61 or the second strip-shaped metal layer 62 is cut off, so that four capacitors Capacitor units that include can be electrically isolated from other capacitor units to maintain the electrical isolation of the capacitors.

FIG. 16 is a top plan view of the film capacitor 140 of the sixth embodiment. A film capacitor 140 of the sixth embodiment will be described. The same reference numerals are used for the parts corresponding to those of the first embodiment.

In this embodiment, the second metal layer includes a first overlapping portion 76 that overlaps a portion of the first strip-shaped metal layer 61 closer to the base end, and a second overlap portion that overlaps a portion of the second strip-shaped metal layer 62 closer to the tip. a first planar metal layer 78 having a portion 77; a third overlapping portion 79 overlapping a portion of the first strip-shaped metal layer 61 closer to the tip; a second planar metal layer 89 having a fourth overlapping portion 81; a fifth overlapping portion 91 overlapping the intermediate portion of the first strip-shaped metal layer 61; and a third planar metal layer 93 having six overlapping portions 92 .

The area of the first overlapping portion 76 is equal to the area of the second overlapping portion 77, the area of the third overlapping portion 79 is equal to the area of the fourth overlapping portion 81, and the area of the fifth overlapping portion 91 is equal to the area of the sixth overlapping portion. equal to the area of portion 92;

According to this embodiment, it is possible to further suppress electric charges from flowing into the portion of the first strip-shaped metal layer 61 where the dielectric breakdown has occurred from the portion of the first strip-shaped metal layer 61 where the dielectric breakdown has not occurred. . In addition, it is possible to further suppress electric charges from flowing into the portion of the second strip-shaped metal layer 62 where the dielectric breakdown has occurred from the portion of the second strip-shaped metal layer 62 where the dielectric breakdown has not occurred. Furthermore, it is possible to further suppress electric charges from flowing into the planar metal layer in which dielectric breakdown has occurred from the planar metal layer in which dielectric breakdown has not occurred.

FIG. 17 is a plan view of the film capacitor 150 of the seventh embodiment viewed from above. In this embodiment, the first strip-shaped metal layer 61 and the second strip-shaped metal layer 62 are each divided into four, and the second In this configuration, the metal layer further includes a fourth planar metal layer 95 . With such a configuration, it is possible to further limit the flow of charge from the portion of the strip-shaped metal layer where dielectric breakdown has not occurred to the portion of the strip-shaped metal layer where dielectric breakdown has occurred. In addition, it is possible to further limit the flow of charge from the overlapped portion where dielectric breakdown has not occurred to the overlapped portion where dielectric breakdown has occurred.

The present disclosure enables the following embodiments.

(1) In the film capacitor of the present disclosure, a first metal layer is provided on one surface, and the first metal layer is arranged on a first edge in a first direction of the one surface and perpendicular to the first direction. and a first common metal layer continuously provided along the second direction, and a second edge portion of the one surface in the first direction, provided continuously along the second direction. a first dielectric film having a second common metal layer; a second metal layer disposed on one surface; and a second dielectric film provided with a continuous edge insulating region along a second direction orthogonal to the first direction, the cylindrical film roll being laminated in a plan view. a film roll wound such that a portion of the first metal layer and a portion of the second metal layer overlap;
a first metal electrode and a second metal electrode formed on each of a pair of end surfaces of the film roll 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a rectangular planar metal layer in which the first metal electrode and the second metal electrode are electrically isolated by the edge insulation region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. , and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.

(2) In the film capacitor of the present disclosure, a first metal layer is provided on one surface, and the first metal layer is arranged on a first edge of the one surface in a first direction and perpendicular to the first direction. and a first common metal layer continuously provided along the second direction, and a second edge portion of the one surface in the first direction, provided continuously along the second direction. a first dielectric film having a second common metal layer; a second metal layer disposed on one surface; and a second dielectric film provided with a continuous edge insulating region along a second direction perpendicular to the first direction. a film laminate laminated such that a portion of the metal layer and a portion of the second metal layer overlap;
a first metal electrode and a second metal electrode formed 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a rectangular planar metal layer in which the first metal electrode and the second metal electrode are electrically isolated by the edge insulation region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. , and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.

(3) The film capacitor of (1) or (2) above,
The first strip-shaped metal layer has a base end connected to the first common metal layer and a tip opposite to the base end,
The second strip-shaped metal layer has a base end connected to the second common metal layer and a tip opposite to the base end,
The planar metal layer is
A first planar metal layer having a first overlapping portion that overlaps a portion of the first strip-shaped metal layer closer to the base end and a second overlapping portion that overlaps a portion of the second strip-shaped metal layer closer to the tip. When,
A second planar metal layer having a third overlapping portion that overlaps a portion of the first strip-shaped metal layer closer to the distal end, and a fourth overlapping portion that overlaps a portion of the second strip-shaped metal layer closer to the proximal end. It is a film capacitor with

(4) The film capacitor of (3) above,
The first overlapping portion and the second overlapping portion are connected via a fuse,
The third overlapping portion and the fourth overlapping portion are film capacitors connected via a fuse.

(5) The film capacitor of (1) or (2) above,
A portion of the first strip-shaped metal layer in the first overlapping portion near the base end and a portion of the first strip-shaped metal layer in the third overlapping portion near the tip end are connected via a fuse. A portion of the second strip-shaped metal layer in the second overlapping portion near the tip end and a portion of the second strip-shaped metal layer in the fourth overlapping portion near the base end are connected via a fuse. is a film capacitor connected

(6) The film capacitor of (5) above,
In the film capacitor, the area of the first overlapping portion is equal to the area of the second overlapping portion, and the area of the third overlapping portion is equal to the area of the fourth overlapping portion.

(7) The film capacitor of (1) or (2) above,
The planar metal layer is
The first surface having the first overlapping portion overlapping the base end portion of the first strip-shaped metal layer and the second overlapping portion overlapping the tip end portion of the second strip-shaped metal layer. a metal layer;
The second surface having the third overlapping portion overlapping the portion of the first strip-shaped metal layer closer to the distal end and the fourth overlapping portion overlapping the portion of the second strip-shaped metal layer closer to the base end. a metal layer;
a third planar metal layer having a fifth overlapping portion that overlaps an intermediate portion of the first strip-shaped metal layer and a sixth overlapping portion that overlaps an intermediate portion of the second strip-shaped metal layer; It is a film capacitor.

(8) The film capacitor of (7) above,
The area of the first overlapping portion is equal to the area of the second overlapping portion, the area of the third overlapping portion is equal to the area of the fourth overlapping portion, and the area of the fifth overlapping portion is equal to the area of the sixth overlapping portion. It is a film capacitor equal to the area of the overlapping part.

(9) A film capacitor according to any one of (1) to (8) above,
The first metal layer includes a first connection metal layer that connects the first common metal layer and the first strip-shaped metal layer, and a second connection metal layer that connects the second common metal layer and the second strip-shaped metal layer. A film capacitor further comprising a connecting metal layer.

(10) The film capacitor of (9) above,
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 second 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;
The film capacitor further comprises 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 first strip-shaped metal layer.

(11) A film capacitor according to any one of (1) to (10) above,
The first strip-shaped metal layer and the second strip-shaped metal layer are film capacitors arranged alternately so as to be adjacent to each other in the second direction.

(12) including a film capacitor according to any one of (1) to (10) above;
A coupled capacitor comprising a plurality of film capacitors and a bus bar connecting the plurality of film capacitors.

(13) comprising a bridge circuit composed of switching elements and a capacitor connected to the bridge circuit,
The inverter, wherein the capacitive section includes the film capacitor according to any one of (1) to (10) above.

(14) comprising a power supply, an inverter connected to the power supply, a motor connected to the inverter, and wheels driven by the motor;
The electric vehicle, wherein the inverter is the inverter according to (13).

According to the present disclosure, it is possible to provide a highly reliable series capacitor in which non-uniformity in area between cells is less likely to occur and in which non-uniformity in area between cells can be suppressed.

According to the present disclosure, a connected capacitor, an inverter, and an electric vehicle using highly reliable series capacitors can be achieved.

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, 3A, 3B First metal layer 3Aa, 61 First belt-like metal layer 3Ab First connection metal layer 3Ab1 First connection wiring 3Ab2 Second connection wiring 3Ab3 Third connection wiring 3Ac First common metal layer 3Ba, 62 Second belt-like Metal layer 3Bb Second connection metal layer 3Bb1 Fourth connection wiring 3Bb2 Fifth connection wiring 3Bb3 Sixth connection wiring 3Bc Second common metal layer 4 Film laminate 5A Metallicon (first metal electrode)
5B metallikon (second metal electrode)
6 lead wire 7 exterior member 8 metal layer (second metal layer)

Reference Signs List

10, 100, 110, 120, 130, 140, 150

film capacitor

21, 23

bus bar

21a,

23a terminal section

21b, 23b extraction terminal section 31 bridge circuit 33 capacity section 35 step-up circuit 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
71 intermediate portion 72 long side 73 short side 75 planar metal layer 76 first overlapping portion 77 second overlapping portion 78 first planar metal layer 79 third overlapping portion 80 second planar metal layer 81 fourth overlapping portion 82 fuse 91 fifth overlapping portion 92 sixth overlapping portion 93 third planar metal layer 95 fourth planar metal layer A film capacitor B coupled capacitor C inverter D electric vehicle M motor T edge insulation area

Claims

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 provided along the second direction on the second edge of the one surface in the first direction. A dielectric film and a second metal layer disposed on one surface, and a second direction orthogonal to the first direction on each of the first edge and the second edge in the first direction of the one surface A cylindrical film roll in which a second dielectric film provided with an edge insulating region continuous along the second dielectric film is laminated, wherein a part of the first metal layer and the second a film roll wound so as to partially overlap with the metal layer;
a first metal electrode and a second metal electrode formed on each of a pair of end surfaces of the film roll 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a planar metal layer overlapping the first strip-shaped metal layer and the second strip-shaped metal layer with the first metal electrode and the second metal electrode electrically insulated by the edge insulating region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.
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 provided along the second direction on the second edge of the one surface in the first direction. A dielectric film and a second metal layer disposed on one surface, and a second direction orthogonal to the first direction on each of the first edge and the second edge in the first direction of the one surface A rectangular parallelepiped film laminate in which a second dielectric film provided with an edge insulating region continuous along the A film laminate laminated so that a part of the layer overlaps,
a first metal electrode and a second metal electrode formed 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 toward the second common metal layer while being electrically connected to the first common metal layer;
a plurality of second strip-shaped metal layers extending toward the first common metal layer along the first direction while being electrically connected to the second common metal layer;
The second metal layer is
a planar metal layer overlapping the first strip-shaped metal layer and the second strip-shaped metal layer with the first metal electrode and the second metal electrode electrically insulated by the edge insulating region;
The second metal layer is
The length in the first direction is shorter than the length in the first direction of the first strip-shaped metal layer, and the length in the first direction is the length in the first direction of the second strip-shaped metal layer. and the entire length in the first direction overlaps the intermediate portions in the first direction of the first strip-shaped metal layer and the second strip-shaped metal layer.
The first strip-shaped metal layer has a base end connected to the first common metal layer and a tip opposite to the base end,
The second strip-shaped metal layer has a base end connected to the second common metal layer and a tip opposite to the base end,
The planar metal layer is
A first planar metal layer having a first overlapping portion that overlaps a portion of the first strip-shaped metal layer closer to the base end and a second overlapping portion that overlaps a portion of the second strip-shaped metal layer closer to the tip. When,
A second planar metal layer having a third overlapping portion that overlaps a portion of the first strip-shaped metal layer closer to the distal end, and a fourth overlapping portion that overlaps a portion of the second strip-shaped metal layer closer to the proximal end. 3. The film capacitor according to claim 1, comprising:
The first overlapping portion and the second overlapping portion are connected via a fuse,
4. The film capacitor according to claim 3, wherein said third overlapping portion and said fourth overlapping portion are connected via a fuse.
A portion of the first strip-shaped metal layer in the first overlapping portion near the base end and a portion of the first strip-shaped metal layer in the third overlapping portion near the tip end are connected via a fuse. A portion of the second strip-shaped metal layer in the second overlapping portion near the tip end and a portion of the second strip-shaped metal layer in the fourth overlapping portion near the base end are connected via a fuse. 3. A film capacitor according to claim 1 or 2, which is connected to
6. The film capacitor according to claim 5, wherein the area of said first overlapping portion is equal to the area of said second overlapping portion, and the area of said third overlapping portion is equal to the area of said fourth overlapping portion.
The planar metal layer is
The first surface having the first overlapping portion overlapping the base end portion of the first strip-shaped metal layer and the second overlapping portion overlapping the tip end portion of the second strip-shaped metal layer. a metal layer;
The second surface having the third overlapping portion overlapping the portion of the first strip-shaped metal layer closer to the distal end and the fourth overlapping portion overlapping the portion of the second strip-shaped metal layer closer to the base end. a metal layer;
a third planar metal layer having a fifth overlapping portion that overlaps an intermediate portion of the first strip-shaped metal layer and a sixth overlapping portion that overlaps an intermediate portion of the second strip-shaped metal layer; The film capacitor according to claim 1 or 2.
The area of the first overlapping portion is equal to the area of the second overlapping portion, the area of the third overlapping portion is equal to the area of the fourth overlapping portion, and the area of the fifth overlapping portion is equal to the area of the sixth overlapping portion. 8. A film capacitor according to claim 7, equal to the area of the overlap.
The first metal layer includes a first connection metal layer that connects the first common metal layer and the first strip-shaped metal layer, and a second connection metal layer that connects the second common metal layer and the second strip-shaped metal layer. A film capacitor according to any one of claims 1 to 8, further comprising a connecting metal layer.
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 second 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;
10. The method according to claim 9, further comprising: a sixth connection wiring directly connected to said fifth connection wiring, extending from said fifth connection wiring in said first direction, and directly connected to said first strip-shaped metal layer. of film capacitors.
The film capacitor according to any one of claims 1 to 10, wherein the first strip-shaped metal layers and the second strip-shaped metal layers are alternately arranged so as to be adjacent to each other in the second direction.
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 1-10.
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 10.
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 13 .