WO2023053911A1

WO2023053911A1 - Film capacitor, connected capacitor, inverter and electric vehicle

Info

Publication number: WO2023053911A1
Application number: PCT/JP2022/033971
Authority: WO
Inventors: 耕世神垣
Original assignee: 京セラ株式会社
Priority date: 2021-09-30
Filing date: 2022-09-09
Publication date: 2023-04-06

Abstract

According to the present invention, a film laminate is configured by stacking a first dielectric film which comprises a first metal layer and a second dielectric film which comprises a second metal layer that comprises a first common metal layer and a second common metal layer; and a pair of metal electrodes are formed on a pair of end faces of the film laminate. The second metal layer comprises first to fourth band-like metal layers. The first metal layer comprises: a first intermediate electrode layer that intersects with a part of the first band-like metal layer and the third band-like metal layer; and a second intermediate electrode layer that intersects with the second band-like metal layer and the fourth band-like 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.

WO2019/069624

A film capacitor of the present disclosure includes a first dielectric film including a first metal layer on one surface and a second dielectric film including a second metal layer on one surface, wherein the second metal layer is the first dielectric film on the one surface. a first common metal layer continuously provided along a second direction perpendicular to the first direction on a first edge in one direction; and a second dielectric film having a second common metal layer continuously provided along the second direction on the edge portion of the film laminate. a film laminate having a pair of end surfaces laminated so that a portion of the first metal layer and a portion of the second metal layer overlap; a pair of metal electrodes electrically connected to a second metal layer, the second metal layer being a first strip electrically insulated from the first common metal layer and the second common metal layer. a metal layer, a second strip-shaped metal layer electrically connected to the first strip-shaped metal layer, and the first common metal layer positioned adjacent to the first strip-shaped metal layer in the second direction, and a third strip-shaped metal layer electrically connected to a fourth strip-shaped metal layer adjacent to the second strip-shaped metal layer in the first direction and electrically connected to the second common metal layer; and wherein the first metal layer extends in the first direction and intersects with a portion of the first strip-shaped metal layer and the third strip-shaped metal layer in a plan view, and a first intermediate electrode layer and a second intermediate electrode layer extending in the first direction and intersecting with a portion of the second strip-shaped metal layer and the fourth strip-shaped metal layer in plan view.

A film capacitor of the present disclosure includes a first dielectric film including a first metal layer on one surface and a second dielectric film including a second metal layer on one surface, wherein the second metal layer is the first dielectric film on the one surface. a first common metal layer continuously provided along a second direction perpendicular to the first direction on a first edge in one direction; and a second dielectric film having a second common metal layer continuously provided along the second direction on the edge portion of the film laminate. a film laminate having a pair of end surfaces laminated so that a portion of the first metal layer and a portion of the second metal layer overlap; and a pair of metal electrodes electrically connected to the first metal layer, wherein the second metal layer is a first strip electrically insulated from the first common metal layer and the second common metal layer. a metal layer; a second strip-shaped metal layer electrically connected to the second common metal layer; and a first strip-shaped metal layer located between the first strip-shaped metal layer and the second strip-shaped metal layer. a fourth strip-shaped metal layer electrically connected to the first common metal layer; and a fifth strip-shaped metal layer electrically insulated from the second common metal layer. a metal layer; and a sixth strip-shaped metal layer positioned between the fourth strip-shaped metal layer and the fifth strip-shaped metal layer and electrically connected to the fifth strip-shaped metal layer; The first metal layer extends in the second direction and includes a first intermediate electrode layer that intersects the first strip-shaped metal layer and the fourth strip-shaped metal layer in plan view, and a first intermediate electrode layer that extends in the second direction and extends in plan view. a second intermediate electrode device intersecting the third strip-shaped metal layer and the fifth strip-shaped metal layer; and intersecting third intermediate electrode layers.

A film capacitor of the present disclosure includes a first dielectric film including a first metal layer on one surface and a second dielectric film including a second metal layer on one surface, wherein the second metal layer is the first dielectric film on the one surface. a first common metal layer continuously provided along a second direction perpendicular to the first direction on a first edge in one direction; and a second dielectric film having a second common metal layer continuously provided along the second direction on the edge portion, the film roll body configured by being laminated, in a plan view. a film laminate having a pair of end surfaces, which is stacked such that a portion of the first metal layer and a portion of the second metal layer overlap; and a film laminate formed on the pair of end surfaces of the film laminate. and a pair of metal electrodes electrically connected to the first metal layer and the second metal layer, wherein the second metal layer is electrically connected to the first common metal layer and the second common metal layer. a first strip-shaped metal layer electrically insulated from and adjacent to the first common metal layer; and a second common metal layer electrically insulated from the first common metal layer and the second common metal layer. a second strip-shaped metal layer disposed adjacent to the metal layer; and a second strip-shaped metal layer positioned between the first strip-shaped metal layer and the second strip-shaped metal layer and electrically connected to the first strip-shaped metal layer. a third strip-shaped metal layer; a fourth strip-shaped metal layer positioned between the third strip-shaped metal layer and the second strip-shaped metal layer and electrically connected to the third strip-shaped metal layer; a fifth strip-shaped metal layer electrically connected to the common metal layer; a sixth strip-shaped metal layer electrically connected to the second common metal layer; and the fifth strip-shaped metal layer and the sixth strip-shaped metal layer and electrically insulated from the first common metal layer and the second common metal layer, and between the seventh strip-shaped metal layer and the sixth strip-shaped metal layer and an eighth strip-shaped metal layer electrically connected to the seventh strip-shaped metal layer, wherein the first strip-shaped metal layer extends in the second direction and, in plan view, the a first intermediate electrode layer intersecting the first strip-shaped metal layer and the fifth strip-shaped metal layer; two intermediate electrode layers, a third intermediate electrode layer extending in the second direction and crossing the third strip-shaped metal layer and the seventh strip-shaped metal layer in plan view, and a third intermediate electrode layer extending in the second direction and extending in the plane and a fourth intermediate electrode layer that visually crosses the fourth strip-shaped metal layer and the eighth strip-shaped metal layer.

A coupled capacitor of the present disclosure includes the film capacitor described above and a bus bar connecting a plurality of the film capacitors.

The inverter of the present disclosure includes a bridge circuit configured by switching elements, and a capacitive section connected to the bridge circuit, and the capacitive section includes the film capacitor.

An electric vehicle of the present disclosure includes a power supply, an inverter connected to the power supply, a motor connected to the inverter, and wheels driven by the motor, and the inverter is the inverter described above.

FIG. 4 is a plan view of a second dielectric film used in a four-series film capacitor in accordance with one embodiment of the present disclosure; FIG. 4A is a plan view of a first dielectric film used in a four-series film capacitor according to an embodiment of the present disclosure; It is the top view which looked at the film capacitor from upper direction. FIG. 4 is a cross-sectional view schematically showing a lamination state of films. FIG. 3 is an exploded perspective view showing a stacked state (before cutting) of the first dielectric film and the second dielectric film; FIG. 3 is a perspective view of a film laminate after being cut into a predetermined length, as viewed obliquely from above; FIG. 3 is an external perspective view showing a configuration after thermal spraying of metal electrodes; 1 is a plan view schematically showing a 4-series film capacitor according to an embodiment of the present disclosure; FIG. FIG. 4 is a plan view schematically showing a four-series film capacitor according to another embodiment of the present disclosure; FIG. 2 is a plan view schematically showing a 6-series film capacitor according to an embodiment of the present disclosure; FIG. 6 is a plan view schematically showing a 6-series film capacitor according to another embodiment of the present disclosure; FIG. 6 is a plan view schematically showing a 6-series film capacitor according to another embodiment of the present disclosure; 1 is a plan view schematically showing an 8-series film capacitor according to an embodiment of the present disclosure; FIG. FIG. 4 is a plan view schematically showing an 8-series film capacitor according to another embodiment of the present disclosure; FIG. 4 is a plan view schematically showing an 8-series film capacitor according to another embodiment of the present disclosure; 1 is a partially cutaway perspective view showing the appearance of a film capacitor; FIG. 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.

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 has excellent moisture resistance, is widely used as vapor deposition electrodes. In the technical invention, when a voltage is applied to a film capacitor, electric field concentration tends to occur at the boundary between the deposited electrode portion and the non-electrode portion, and it is proposed to suppress the decrease in capacitance due to oxidation of the deposited electrode.

In the prior art described in Patent Document 1, it is possible to suppress the decrease in capacitance due to oxidation of the deposition electrode, but due to non-uniformity in the capacitance of each capacitor cell connected in series, each capacitor cell There is a problem that the effective voltage applied to the capacitor cell has a difference in magnitude, and the life of the capacitor cell is shortened. Such problems occur not only in two-series capacitors but also in four-series or more capacitors.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a series-type film capacitor, a coupled-type capacitor in which a plurality of film capacitors are connected, an inverter and an electric motor using film capacitors, which can suppress shortening of life due to imbalance in the effective voltage of each capacitor cell. to provide a vehicle.

An embodiment of a film capacitor according to the present disclosure will be described below with reference to the drawings.

(4 series film capacitors)
1A to 1D are diagrams showing the configuration of a film capacitor 1 according to an embodiment of the present disclosure, and FIG. 1A is a plan view of a second dielectric film 7 used in a 4-series film capacitor. FIG. 1B is a plan view of a first dielectric film 3 used in a four-series film capacitor. FIG. 1C is a plan view of the film capacitor viewed from above. FIG. 1D is a cross-sectional view schematically showing a laminated state of films.

The film capacitor 1 of the present embodiment comprises a first dielectric film 3 containing a first metal layer 2 on one surface and a second dielectric film 7 containing a second metal layer 4 on one surface. a first common metal layer 5 provided continuously along a second direction y perpendicular to the first direction x at a first edge of the one surface in a first direction x, and A second dielectric film 7 having a second common metal layer 6 continuously provided along a second direction y on a second edge of one surface in the first direction x is laminated. A film laminate 8 having a pair of end faces 9a and 9b laminated so that a part of the first metal layer 2 and a part of the second metal layer 4 overlap in plan view. and a pair of

metal electrodes

10a and 10b respectively formed on a pair of

end faces

9a and 9b on both sides of the film laminate 8 in the first direction x and electrically connected to the second metal layer 4. include.

The second metal layer 4 is electrically connected to a first strip-shaped metal layer 4a electrically insulated from the first common metal layer 5 and the second common metal layer 6, and electrically connected to the first strip-shaped metal layer 4a. a second strip-shaped metal layer 4b electrically insulated from the first common metal layer 5 and the second common metal layer 6; A third strip-shaped metal layer 4c electrically connected to the layer 5 and a third strip-shaped metal layer 4c located adjacent to the second strip-shaped metal layer 4b in the second direction y and electrically connected to the second common metal layer 6. 4 strip-shaped metal layers 4d.

The first metal layer 2 extends in the second direction y, and in plan view, the first intermediate electrode layer 2a intersects the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c, and the first intermediate electrode layer 2a extends in the second direction y. and a second intermediate electrode layer 2b intersecting the second strip-shaped metal layer 4b and the fourth strip-shaped metal layer 4d in plan view. These strip-shaped metal layers 4a to 4d and

intermediate electrode layers

2a and 2b are symmetrical about a first imaginary plane containing an axis extending in the first direction x and an axis extending in the third direction z, and It is formed symmetrically with respect to a second imaginary plane including an axis extending in x and an axis extending in a second direction y.

As the constituent material of the base film of the first dielectric film 3 and the second dielectric film 7, organic resin materials such as polypropylene, polyethylene terephthalate, polyarylate, and cycloolefin polymer can be used. Moreover, as a constituent material of the first metal layer 2 and the second metal layer 4, a metal material such as aluminum can be used.

The first metal layer 2 on the surface of the first dielectric film 3 and the second metal layer 4 on the surface of the second dielectric film 7 are formed by metal vapor deposition on the base film. Between the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c and between the second strip-shaped metal layer 4c and the fourth strip-shaped metal layer 4d adjacent in the second direction y, the base film surface is provided with an insulating margin. As a result, the strip-

like metal layers

4a, 4c; 4c, 4d are electrically insulated from each other.

The first metal layer 2 on one side of the first dielectric film 3, the second metal layer 4 on one side of the second dielectric film 7, the first common metal layer 5 and the second common metal layer 6 are metal vapor deposition on the base film. formed by

Here, a method for manufacturing the film capacitor 1 will be described. FIG. 2 is an exploded perspective view showing the laminated state (before cutting) of the first dielectric film 3 and the second dielectric film 7, and FIG. 3 is an external perspective view showing the configuration of the film laminate 8 after cutting. is. FIG. 4 is an external perspective view showing the configuration after thermal spraying of the

metal electrodes

10a and 10b.

First, as shown in FIG. 2, a second dielectric film 7 having a second metal layer 4 extending in the second direction y and a first dielectric film 3 having a first metal layer 2 are formed on the surface of a base film. are stacked alternately to form a film laminate 8 . A virtual line (a two-dot chain line) in FIG. 2 indicates a cutting line after lamination.

FIG. 3 is a perspective view of the film laminate 8 after being cut to a predetermined length, viewed obliquely from above. FIG. 4 is a perspective view showing the configuration after thermal spraying of the

metal electrodes

10a and 10b. As shown in FIG. 3, the first dielectric film 3 and the second dielectric film 7 vertically adjacent to each other are separated from each other by the center line (the center point in the x direction) of the first dielectric film 3 and the second dielectric film 7. The first common metal layer 5 and the second common metal layer 6 are exposed on both end surfaces of the film laminate 8 in the x direction.

At the top of the film laminate 8, a base film 7a having neither the first metal layer 2 nor the second metal layer 4 is laminated.

The second metal layer 4 includes a first connection metal layer 21 electrically connecting the first common metal layer 5 and the third strip-shaped metal layer 4c, and the first strip-shaped metal layer 4a and the second strip-shaped metal layer 4b. It includes a second connection metal layer 22 for electrically connecting and a third connection metal layer 23 for electrically connecting the second common metal layer 6 and the fourth strip-shaped metal layer 4d. As another embodiment of the present disclosure, the connection metal layer 21 may function as a fuse between the third strip-shaped metal layer 4c and the first common metal layer 5, and the second connection metal layer 22 may , may function as a fuse between two strip-shaped

metal layers

4a, 4b located adjacent in the first direction x. Also, the third connection metal layer 23 may function as a fuse between the fourth strip-shaped metal layer 4 d and the second common metal layer 6 .

For example, if the dielectric breakdown of the base film occurs, the capacitor cell composed of the first strip-shaped metal layer 4a and the first intermediate electrode layer 2a or the capacitor cell composed of the second strip-shaped metal layer 4b and the second intermediate electrode layer 2b is short-circuited. However, when a current exceeding a specified value flows, the high-resistance second connection metal layer 22 is burnt out, causing disconnection, which prevents the function of the entire film capacitor 1 from stopping.

When the capacitor cell composed of the third strip-shaped metal layer 4c and the first intermediate electrode layer 2a is destroyed, the first connection metal layer 21 is burnt out to disconnect the fourth strip-shaped metal layer 4d and the second intermediate electrode layer 21. If the capacitor cell made of the layer 2b is destroyed, the third connection metal layer 23 is burnt out, resulting in disconnection.

According to such a configuration, for example, in the process of laminating or winding a pair of films, an electrode pattern shift occurs due to a positional shift in the x direction, and the first metal layer 2 (2a, 2b) becomes the second metal layer. 4 (4a, 4b, 4c, 4d), the first strip-shaped metal layer 4a, the third strip-shaped metal layer 4c, and the first intermediate electrode layer even if they are shifted in the first direction x. 2a does not change in plan view, and the overlap areas of the second intermediate electrode layer 2b and the second strip-shaped metal layer 4b, the fourth strip-shaped metal layer 4d and the second intermediate electrode layer 2b do not change in plan view. It is possible to suppress the occurrence of voltage change.

FIG. 5 is a plan view schematically showing a four-series film capacitor 1a according to the embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. The film capacitor 1a of this embodiment has a first dielectric film 3 including a pair of first metal layers 2 (2a, 2b) on one surface and a pair of second metal layers 4 (4a, 4b, 4c) on one surface. a second dielectric film 7 comprising: a second metal layer 4 along a first edge in a first direction x of said one side along a second direction y perpendicular to the first direction x A first common metal layer 5 continuously provided, and a second common metal layer 6 continuously provided along the second direction y on the second edge of one surface in the first direction x. A film laminate 8 configured by laminating a second dielectric film 7 having and a film laminate 8 having a pair of

end surfaces

9a and 9b (see FIG. 4), which are formed on the pair of

end surfaces

9a and 9b of the film laminate 8 and electrically connected to the first metal layer 2 and a pair of

metal electrodes

10a, 10b (see FIG. 4).

The second metal layer 4 is electrically connected by the first strip-shaped metal layer 4ab electrically insulated from the first common metal layer 5 and the second common metal layer 6 and the first common metal layer 5 and the first connection metal layer 21 . and the second strip-shaped metal layer 4 c is electrically connected to the second common metal layer 6 by the third connection metal layer 23 . and a connected third strip-shaped metal layer 4d.

FIG. 6 is a plan view schematically showing a four-series film capacitor 1b according to another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. In the embodiment of FIG. 5, the film capacitor 1b of this embodiment has a first intermediate electrode layer 2aa integrally formed by connecting the first intermediate electrode layers 2a in the second direction y, and a second intermediate electrode layer 2b has a second intermediate electrode layer 2bb integrally formed by being connected to each other in the second direction y. Other first strip-shaped metal layer 4ab, second strip-shaped metal layer 4c, third strip-shaped metal layer 4d, first common metal layer 5, second common metal layer 6, first connection metal layer 21, third connection metal layer 23 are similar to the embodiment of FIG.

(6 series film capacitors)
FIG. 7 is a plan view schematically showing a 6-series film capacitor 1c according to an embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted.

The film capacitor 1c of this embodiment includes a first dielectric film 3 including a pair of first metal layers 2 (2a to 2c) on one surface and a second dielectric film 3 including a pair of second metal layers 4 (4a to 4f) on one surface. 2 dielectric films 7, each of the second metal layers 4 being aligned along a second direction y perpendicular to the first direction x at a first edge of the one side in a first direction x A first common metal layer 5 continuously provided, and a second common metal layer 6 continuously provided along the second direction y on the second edge of one surface in the first direction x. and a second dielectric film 7 having a pair of end surfaces laminated so that the first metal layer 2 and the second metal layer 4 overlap in plan view. A film stack 8 having 9a, 9b (see FIG. 4) and a pair of metals formed on a pair of

end surfaces

9a, 9b of the film stack 8 and electrically connected to the second strip-shaped metal layers 4b, 4d. and

electrodes

10a and 10b (see FIG. 4).

The second metal layer 4 includes a first strip-shaped metal layer 4a electrically insulated from the first common metal layer 5 and the second common metal layer 6, and a second strip-shaped metal layer 4a electrically connected to the second common metal layer 6. a third strip-shaped metal layer 4c located between the first strip-shaped metal layer 4a and the second strip-shaped metal layer 4b and electrically connected to the first strip-shaped metal layer 4a; A fourth strip-shaped metal layer 4d electrically connected to the metal layer 5, a fifth strip-shaped metal layer 4e electrically insulated from the second common metal layer 6, the fourth strip-shaped metal layer 4d and the fifth strip-shaped metal and a sixth strip-shaped metal layer 4f positioned between the layer 4e and electrically connected to the fifth strip-shaped metal layer 4e. These first to sixth strip-shaped metal layers 4a to 4f are formed symmetrically with respect to one plane including an axis extending in the first direction x and an axis extending in the third direction z.

The first metal layer 2 includes a first intermediate electrode layer 2a extending in the second direction y and intersecting the first strip-shaped metal layer 4a and the fourth strip-shaped metal layer 4d, and a second strip-shaped electrode layer 2a extending in the second direction y. A second intermediate electrode layer 2b intersecting the metal layer 4b and the fifth strip-shaped metal layer 4e, and a third intermediate electrode layer extending in the second direction y and intersecting the third strip-shaped metal layer 4c and the sixth strip-shaped metal layer 4f. 2c and

These strip-shaped metal layers 4a to 4f and intermediate electrode layers 2a to 2c are symmetrical about a first imaginary plane containing an axis extending in the first direction x and an axis extending in the third direction z, and are arranged in the first direction. It is formed symmetrically with respect to a second imaginary plane including an axis extending in x and an axis extending in a second direction y.

The second metal layer 4 includes a fourth connection metal layer 24 electrically connecting the first common metal layer 5 and the fourth strip-shaped metal layer 4d, and the second common metal layer 6 and the second strip-shaped metal layer 4b. A fifth connection metal layer 25 for electrically connecting, a sixth connection metal layer 26 for electrically connecting the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c, and a fifth strip-shaped metal layer 4e and the sixth strip-shaped metal layer 4c. and a seventh connection metal layer 27 electrically connecting with the strip-shaped metal layer 4f. As another embodiment of the present disclosure, the sixth and seventh connecting

metal layers

26, 27 are between each two strip-shaped

metal layers

4a, 4c; 4f, 4e located adjacent in the first direction x. It may function as a fuse. Further, the fourth connection metal layer 24 may function as a fuse between the strip-shaped metal layer 4d and the first common metal layer 5, and the fifth connection metal layer 25 may serve as a fuse between the strip-shaped metal layer 4b and the first common metal layer 5. It may function as a fuse between the two common metal layers 6 . For example, the dielectric breakdown of the base film may cause a short circuit in the capacitor cell composed of the first strip-shaped metal layer 4a and the first intermediate electrode layer 2a or the capacitor cell composed of the third strip-shaped metal layer 4c and the third intermediate electrode layer 2c. However, when a current exceeding a specified value flows, the high-resistance sixth connection metal layer 26 is burnt out, thereby breaking the wire and preventing the function of the entire film capacitor 1 from stopping.

In addition, the capacitor cell composed of the sixth strip-shaped metal layer 4f and the third intermediate electrode layer 2c or the capacitor cell composed of the fifth strip-shaped metal layer 4e and the second intermediate electrode layer 2b was short-circuited, and a current exceeding the specified value flowed. In this case, the high-resistance seventh connection metal layer 27 is burnt out, causing disconnection.

Further, when the capacitor cell composed of the fourth strip-shaped metal layer 4d and the first intermediate electrode layer 2a is destroyed, the fourth connection metal layer 24 is burnt out to disconnect the second strip-shaped metal layer 4b and the second strip-shaped metal layer 2a. If the capacitor cell composed of the intermediate electrode layer 2b is destroyed, the fifth connection metal layer 25 is burnt out, resulting in disconnection.

According to such a configuration, even if the intermediate electrode layers 2a to 2c facing the strip-shaped metal layers 4a to 4f are displaced in at least one of the first direction x and the second direction y, Also, the corresponding overlapped areas of the strip-shaped metal layers 4a-4f and the intermediate electrode layers 2a-2c do not change, and large voltage changes between cells can be suppressed.

FIG. 8 is a plan view schematically showing a 6-series film capacitor 1d according to another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. In the film capacitor 1d of this embodiment, the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c adjacent to the first strip-shaped metal layer 4a in the first direction x in the embodiment of FIG. a strip-shaped metal layer 4ac formed integrally and connected in the direction x; a strip-shaped metal layer 4ef formed integrally by connecting the fifth and sixth strip-shaped

metal layers

4e and 4f in the first direction x; have

According to such a configuration, as shown in FIG. 7, the sixth connection metal layer 26 between the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c, the fifth strip-shaped metal layer 4e and the sixth strip-shaped metal layer By omitting the seventh connection metal layer 27 with 4f, the effective overlapping area of the first metal layer 2 and the second metal layer 4 can be increased. In addition, it is possible to prevent an electric field from being applied to the connection electrode layer serving as the fuse.

FIG. 9 is a plan view schematically showing a 6-series film capacitor 1e according to another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to the above-described respective embodiments, and redundant explanations are omitted. The film capacitor 1e of this embodiment includes strip-shaped metal layers 4ac, 4b, 4c, and 4ef similar to those of the embodiment of FIG. The first intermediate electrode layer 2aa, the second intermediate electrode layer 2bb, which is integrally formed by connecting the second intermediate electrode layers 2b in the second direction y, and the third intermediate electrode layers 2c, which are the second and a third intermediate electrode layer 2cc integrally formed to be connected in the direction y.

According to such a configuration, it is not necessary to align the first dielectric film 3 and the second dielectric film 7 in the y direction during the lamination or winding process, and the manufacturing process can be simplified.

(8 series film capacitors)
FIG. 10 is a plan view schematically showing an 8-series film capacitor 1f according to another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. The film capacitor 1f of this embodiment comprises a first dielectric film 3 including a first metal layer 2 on one surface and a second dielectric film 7 including a second metal layer 4 on one surface. a first common metal layer 5 provided continuously along a second direction y perpendicular to the first direction x at a first edge of the one surface in a first direction x, and A second dielectric film 7 having a second common metal layer 6 continuously provided along a second direction y on a second edge of one surface in the first direction x is laminated. A pair of

end surfaces

9a and 9b (see FIG. 4), which are laminated so that a part of the first metal layer 2 and a part of the second metal layer 4 overlap in plan view. and a pair of

metal electrodes

10a and 10b formed on a pair of end surfaces of the film laminate 8 and electrically connected to the first metal layer 2 and the second metal layer 4 (see FIG. 4 ) and including.

The second metal layer 4 includes a first strip-shaped metal layer 4a electrically insulated from the first common metal layer 5 and the second common metal layer 6, and an electrical contact with the first common metal layer 5 and the second common metal layer 6. a second strip-shaped metal layer 4b which is thermally insulated; and a third strip-shaped metal layer located between the first strip-shaped metal layer 4a and the second strip-shaped metal layer 4b and electrically connected to the first strip-shaped metal layer 4a. a layer 4c, a fourth strip-shaped metal layer 4d located between the third strip-shaped metal layer 4c and the second strip-shaped metal layer 4b and electrically connected to the second strip-shaped metal layer 4b, and a first common metal layer. 5, the sixth strip-shaped metal layer 4f electrically connected to the second common metal layer 6, the fifth strip-shaped metal layer 4e and the sixth strip-shaped metal layer 4f. and electrically insulated from the first common metal layer 5 and the second common metal layer 6, and between the seventh strip-shaped metal layer 4g and the sixth strip-shaped metal layer 4f. It has an eighth strip-shaped metal layer 4h located therebetween and electrically connected to the seventh strip-shaped metal layer 4g. The first to eighth strip-shaped metal layers 4a to 4h are provided symmetrically with respect to one plane including the axis in the first direction x and the axis in the third direction z.

The first metal layer 2 includes a first intermediate electrode layer 2a extending in the second direction y and crossing the first strip-shaped metal layer 4a and the fifth strip-shaped metal layer 4e, and a second strip-shaped electrode layer 2a extending in the second direction y. A second intermediate electrode layer 2b intersecting the metal layer 4b and the sixth strip-shaped metal layer 4f, and a third intermediate electrode layer extending in the second direction y and intersecting the third strip-shaped metal layer 4c and the seventh strip-shaped metal layer 4g. 2c, and a fourth intermediate electrode layer 2d extending in the second direction y and crossing the fourth strip-shaped metal layer 4d and the eighth strip-shaped metal layer 4h.

The second metal layer 4 includes an eighth connection metal layer 121 electrically connecting the first common metal layer 5 and the fifth strip-shaped metal layer 4e, and the second common metal layer 6 and the sixth strip-shaped metal layer 4f. A ninth connection metal layer 122 that electrically connects a tenth connection metal layer 123 that electrically connects the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c together, a fourth strip-shaped metal layer 4d and the second strip-shaped metal layer 4d. It includes an eleventh connection metal layer 124 electrically connecting the strip-shaped metal layer 4b and a twelfth connection metal layer 125 electrically connecting the seventh strip-shaped metal layer 4g and the eighth strip-shaped metal layer 4h. 4g, 4h; may function as a fuse for Moreover, the eighth connection metal layer 121 may function as a fuse between the strip-shaped metal layer 4e and the first common metal layer 5, and the ninth connection metal layer 122 may function as a fuse between the strip-shaped metal layer 4f and the first common metal layer 5. It may function as a fuse between the two common metal layers 6 .

For example, the dielectric breakdown of the base film may cause a short circuit in the capacitor cell composed of the first strip-shaped metal layer 4a and the first intermediate electrode layer 2a or the capacitor cell composed of the third strip-shaped metal layer 4c and the third intermediate electrode layer 2c. However, when a current exceeding a specified value flows, the high-resistance tenth connection metal layer 123 is burnt out, thereby breaking the wire and preventing the function of the entire film capacitor 1 from stopping.

In addition, the capacitor cell comprising the fourth strip-shaped metal layer 4d and the fourth intermediate electrode layer 2d or the capacitor cell comprising the second strip-shaped metal layer 4b and the second intermediate electrode layer 2b is short-circuited, and a current exceeding the specified value flows. In this case, the high-resistance eleventh connection metal layer 124 is burnt out, causing disconnection.

In addition, the capacitor cell composed of the seventh strip-shaped metal layer 4g and the third intermediate electrode layer 2c or the capacitor cell composed of the eighth strip-shaped metal layer 4h and the fourth intermediate electrode layer 2d was short-circuited, and a current exceeding the specified value flowed. In this case, the high-resistance twelfth connection metal layer 125 is burnt out, causing disconnection.

Further, when the capacitor cell composed of the fifth strip-shaped metal layer 4e and the first intermediate electrode layer 2a is destroyed, the eighth connection metal layer 121 is burnt out to disconnect the sixth strip-shaped metal layer 4f and the second strip-shaped metal layer 2a. If the capacitor cell composed of the intermediate electrode layer 2b is destroyed, the ninth connection metal layer 122 is burnt out, resulting in disconnection.

According to such a configuration, even if the intermediate electrode layers 2a to 2d facing the strip-shaped metal layers 4a to 4h are displaced in at least one of the first direction x and the second direction y, However, the overlapping areas of the strip-shaped metal layers 4a to 4h and the intermediate electrode layers 2a to 2d facing each other do not change, and large voltage changes between cells can be suppressed.

FIG. 11 is a plan view schematically showing an 8-series film capacitor 1g of another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. A film capacitor 1g of this embodiment includes a strip-shaped metal layer 4ac in which the first strip-shaped metal layer 4a and the third strip-shaped metal layer 4c in the embodiment of FIG. The fourth strip-shaped metal layer 4d and the second strip-shaped metal layer 4b are connected in the first direction x to form a single strip-shaped metal layer 4bd. and a band-like metal layer 4gh integrally formed so as to be connected in the direction x.

According to such a configuration, the effective overlapping area of the first metal layer 2 and the second metal layer 4 can be increased.

FIG. 12 is a plan view schematically showing an 8-series film capacitor 1h according to another embodiment of the present disclosure. In addition, the same reference numerals are given to the parts corresponding to those of the above-described embodiment, and redundant explanations are omitted. A film capacitor 1h of the present embodiment includes a first intermediate electrode layer 2aa and a second intermediate electrode layer 2b, which are integrally formed by connecting the first intermediate electrode layers 2a in the embodiment of FIG. 11 in the second direction y. A second intermediate electrode layer 2bb formed integrally by being connected in the second direction y, and a third intermediate electrode layer 2cc formed integrally by connecting third intermediate electrode layers 2c in the second direction y. and a fourth intermediate electrode layer 2dd in which the fourth intermediate electrode layers 2d are connected to each other in the second direction y and integrally formed.

With such a configuration, it is not necessary to align the first dielectric film 3 and the second dielectric film 7 in the y direction during the lamination or winding process, and the manufacturing process can be simplified.

In each of the above embodiments, the first dielectric film 3 including the first metal layer 2 on one side and the second dielectric film 7 including the second metal layer 4 on one side, the second metal layer A first common metal layer 5 continuously provided along a second direction y perpendicular to the first direction x at a first edge in a first direction x on one surface, and a first metal layer 5 on one surface a second dielectric film 7 having a second common metal layer 6 continuously provided along a second direction y on a second edge in the direction x; 8, a film laminate 8 having a pair of end faces 9a and 9b laminated so that a part of the first metal layer 2 and a part of the second metal layer 4 overlap in plan view; and a film and a pair of

metal electrodes

10 a and 10 b formed on a pair of end faces of the laminate 8 and electrically connected to the second metal layer 4 .

The second metal layer 4 has a plurality of strip-shaped metal layers elongated in a second direction y perpendicular to the first direction x, and the first metal layer 2 extends in the first direction x in plan view. , a plurality of strip-shaped intermediate electrode layers intersecting the plurality of strip-shaped metal layers. In a plan view, the strip-shaped metal layer and the intermediate electrode layer that overlap each other are displaced in at least one of the first direction x and the second direction y with respect to the other. With respect to the displacement of x, as shown in FIG. 1C, the change in capacitance is measured within the range of distances ΔLx1 and ΔLx2 corresponding to the amount of protrusion of the strip-shaped metal layer from the intermediate electrode layer in the first direction x. can be suppressed. In addition, with respect to the displacement in the second direction y, the change in capacitance is suppressed within the range of distances ΔLy1 and ΔLy2 corresponding to the amount of protrusion in the second direction y from the strip-shaped metal layer of the intermediate electrode layer. be able to.

FIG. 13 is a partially cutaway perspective view showing the appearance of the film capacitor 1. FIG. Parts corresponding to those of the embodiment shown in FIG. 1 are given the same reference numerals. The film capacitor 1 is obtained by covering the film capacitor 1 with an exterior member 30 in terms of insulation and environmental resistance. Lead

wires

31 and 32 for external connection are connected to the

common metal layers

5 and 6, respectively. FIG. 13 shows a state in which a part of the exterior member 30 is notched, and the removed portion of the exterior member 30 is indicated by a broken line.

FIG. 14 is a perspective view schematically showing the configuration of the coupled capacitor 40. FIG. Figure 14 is. For ease of illustration, the case and molding resin are omitted. The coupled capacitor 40 has a structure in which a plurality of film capacitors 1 are connected in parallel by a pair of

bus bars

41 and 42 . The

busbars

41 and 42 include

terminal portions

43 and 44 and lead

terminal portions

45 and 46 . The

terminal portions

43 and 44 are for external connection, and the lead

terminal portions

45 and 46 are connected to the

common metal layers

5 and 6 of the film capacitor 1, respectively.

FIG. 15 is an electric circuit diagram for explaining the configuration of the inverter 50. FIG. FIG. 15 shows an example of an inverter 50 that generates alternating current from rectified direct current. The inverter 50 of this embodiment includes a bridge circuit 51 and a capacitor section 52 . The bridge circuit 51 is composed of, for example, switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and diodes. The capacitive section 52 is arranged between the input terminals of the bridge circuit 51 and stabilizes the voltage. The inverter 50 may include the above-described

film capacitors

1, 1a to 1h or the concatenated capacitor 40 as the capacitive section 52. FIG.

The input of this inverter 50 may be connected to a booster circuit 53 that boosts the voltage of the DC power supply 54 or may be directly connected to the DC power supply 54 . On the other hand, the bridge circuit 51 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. The electric vehicle D includes a drive motor 61 , an engine 62 , a transmission 63 , an inverter 64 , a power supply (battery) 65 , a pair of front wheels 66 and a pair of rear wheels 70 .

This electric vehicle D has a motor 61, an engine 62, or both as a drive source. The output of the drive source is transmitted to a pair of left and right front wheels 66 via a transmission 63 . Power supply 65 is connected to inverter 64 , and inverter 64 is connected to motor 61 .

Also, the electric vehicle D shown in FIG. 16 includes a vehicle ECU 67 and an engine ECU 68 . The vehicle ECU 67 performs overall control of the electric vehicle D as a whole. The engine ECU 68 drives the electric vehicle D by controlling the rotation speed of the engine 62 . The electric vehicle D further includes driving devices such as an ignition key 69 operated by the driver, an accelerator pedal (not shown), and a brake. The vehicle ECU 67 receives a driving signal according to the operation of the driving device by the driver or the like. This vehicle ECU 67 outputs an instruction signal to an engine ECU 68, a power supply 65, and an inverter 64 as a load based on the drive signal. The engine ECU 68 drives the electric vehicle D by controlling the rotation speed of the engine 62 in response to the command signal. An inverter 50 to which the film capacitor 1 or the coupled capacitor 40 of the present embodiment is applied as the capacitance section 52 can be mounted on an electric vehicle D as shown in FIG.

It should be noted that the inverter 50 of the present embodiment can be applied not only to the hybrid electric vehicle (HEV) described above, but also to electric vehicles (EV) or electric bicycles, generators, solar cells, and various other power conversion application products.

In each of the above embodiments, a rectangular parallelepiped film capacitor using the film laminate 8 has been described. good too. In this case, the

aforementioned metal electrodes

10a and 10b are provided at both ends of the columnar capacitor in the axial direction.

The present disclosure enables the following embodiments.

According to the film capacitor of the present disclosure, it is possible to suppress variations in the effective voltage of each capacitor cell due to non-uniformity in the capacitance of each capacitor cell, and to provide a film capacitor with improved life.

According to the present disclosure, it is possible to provide a coupled capacitor, an inverter, and an electric vehicle using highly reliable film capacitors.

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, 1a to 1h film capacitor 2 first metal layer 3 first dielectric film 4 second metal layer 5 first common metal layer 6 second common metal layer 7 second dielectric film 8

film laminate

9a,

9b end surface

10a , 10b metal electrode 4a first strip-shaped metal layer 4b second strip-shaped metal layer 5 first common metal layer 4c third strip-shaped metal layer 4d fourth strip-shaped metal layer 4e fifth strip-shaped metal layer 4f sixth strip-shaped metal layer 4g seventh strip Metal layer 4h Eighth strip-shaped metal layer 6 Second common metal layer

Claims

A first dielectric film including a first metal layer on one side and a second dielectric film including a second metal layer on one side, wherein the second metal layer extends in a first direction on the one side in a first direction. A first common metal layer provided continuously along a second direction perpendicular to the first direction on the edge, and a second metal layer on the second edge of the one surface in the first direction. and a second dielectric film having a second common metal layer continuously provided along the direction of the film laminate, the film laminate configured by laminating a part of the first metal layer in plan view A film laminate having a pair of end faces, laminated so that the second metal layer overlaps with a part of the second metal layer;
a pair of metal electrodes formed on the pair of end faces of the film laminate and electrically connected to the second metal layer;
The second metal layer is
a first strip-shaped metal layer electrically insulated from the first common metal layer and the second common metal layer;
a second strip-shaped metal layer electrically connected to the first strip-shaped metal layer;
a third strip-shaped metal layer positioned adjacent to the first strip-shaped metal layer in the second direction and electrically connected to the first common metal layer;
a fourth strip-shaped metal layer positioned adjacent to the second strip-shaped metal layer in the second direction and electrically connected to the second common metal layer;
The first metal layer is
a first intermediate electrode layer extending in the first direction and crossing the first strip-shaped metal layer and the third strip-shaped metal layer in a plan view;
and a second intermediate electrode layer extending in the first direction and crossing the second strip-shaped metal layer and the fourth strip-shaped metal layer in plan view.
A first dielectric film including a first metal layer on one side and a second dielectric film including a second metal layer on one side, wherein the second metal layer extends in a first direction on the one side in a first direction. A first common metal layer provided continuously along a second direction perpendicular to the first direction on the edge, and a second metal layer on the second edge of the one surface in the first direction. and a second dielectric film having a second common metal layer continuously provided along the direction of the film laminate, the film laminate configured by laminating a part of the first metal layer in plan view A film laminate having a pair of end faces, laminated so that the second metal layer overlaps with a part of the second metal layer;
a pair of metal electrodes formed on the pair of end surfaces of the film laminate and electrically connected to the first metal layer;
The second metal layer is
a first strip-shaped metal layer electrically insulated from the first common metal layer and the second common metal layer;
a second strip-shaped metal layer electrically connected to the second common metal layer;
a third strip-shaped metal layer positioned between the first strip-shaped metal layer and the second strip-shaped metal layer and electrically connected to the first strip-shaped metal layer;
a fourth strip-shaped metal layer electrically connected to the first common metal layer;
a fifth strip-shaped metal layer electrically insulated from the second common metal layer;
a sixth strip-shaped metal layer positioned between the fourth strip-shaped metal layer and the fifth strip-shaped metal layer and electrically connected to the fifth strip-shaped metal layer;
The first metal layer is
a first intermediate electrode layer extending in the second direction and crossing the first strip-shaped metal layer and the fourth strip-shaped metal layer in a plan view;
a second intermediate electrode device extending in the second direction and crossing the third strip-shaped metal layer and the fifth strip-shaped metal layer in plan view;
and a third intermediate electrode layer extending in the second direction and crossing the second strip-shaped metal layer and the six strip-shaped metal layers in plan view.
A first dielectric film including a first metal layer on one side and a second dielectric film including a second metal layer on one side, wherein the second metal layer extends in a first direction on the one side in a first direction. A first common metal layer provided continuously along a second direction perpendicular to the first direction on the edge, and a second metal layer on the second edge of the one surface in the first direction. and a second dielectric film having a second common metal layer continuously provided along the direction of the film roll, wherein the first belt-shaped metal layer in plan view a film laminate having a pair of end surfaces, which is stacked such that a portion of the second strip-shaped metal layer overlaps with a portion of the second strip-shaped metal layer;
a pair of metal electrodes formed on the pair of end faces of the film laminate and electrically connected to the first strip-shaped metal layer and the second strip-shaped metal layer;
The second metal layer is
a first strip-shaped metal layer electrically insulated from the first common metal layer and the second common metal layer and disposed adjacent to the first common metal layer;
a second strip-shaped metal layer electrically insulated from the first common metal layer and the second common metal layer and disposed adjacent to the second common metal layer;
a third metal strip layer positioned between the first strip-shaped metal layer and the second strip-shaped metal layer and electrically connected to the first strip-shaped metal layer;
a fourth strip-shaped metal layer positioned between the third strip-shaped metal layer and the second strip-shaped metal layer and electrically connected to the second strip-shaped metal layer;
a fifth strip-shaped metal layer electrically connected to the first common metal layer;
a sixth strip-shaped metal layer electrically connected to the second common metal layer;
a seventh strip-shaped metal layer located between the fifth strip-shaped metal layer and the sixth strip-shaped metal layer and electrically insulated from the first common metal layer and the second common metal layer;
an eighth strip-shaped metal layer positioned between the seventh strip-shaped metal layer and the sixth strip-shaped metal layer and electrically connected to the seventh strip-shaped metal layer;
The first metal layer is
a first intermediate electrode layer extending in the second direction and crossing the first strip-shaped metal layer and the fifth strip-shaped metal layer in a plan view;
a second intermediate electrode layer extending in the second direction and crossing the second strip-shaped metal layer and the sixth strip-shaped metal layer in plan view;
a third intermediate electrode layer extending in the second direction and crossing the third strip-shaped metal layer and the seventh strip-shaped metal layer in plan view;
and a fourth intermediate electrode layer extending in the second direction and crossing the fourth strip-shaped metal layer and the eighth strip-shaped metal layer in plan view.
The second metal layer is
a first connection metal layer electrically connecting the first common metal layer and the third strip-shaped metal layer;
a second connection metal layer that connects the first strip-shaped metal layer and the second strip-shaped metal layer;
2. The film capacitor according to claim 1, further comprising a third connection metal layer electrically connecting said second common metal layer and said fourth strip metal layer.
The second metal layer is
a fourth connection metal layer electrically connecting the first common metal layer and the fourth strip-shaped metal layer;
a fifth connection metal layer electrically connecting the second common metal layer and the third strip-shaped metal layer;
a sixth connection metal layer electrically connecting the first strip-shaped metal layer and the third strip-shaped metal layer;
3. The film capacitor according to claim 2, further comprising a seventh connecting metal layer electrically connecting said fifth strip-shaped metal layer and said sixth strip-shaped metal layer.
The second metal layer is
an eighth connection metal layer electrically connecting the first common metal layer and the fifth strip-shaped metal layer;
a ninth connection metal layer electrically connecting the second common metal layer and the sixth strip-shaped metal layer;
a tenth connection metal layer electrically connecting the first strip-shaped metal layer and the third strip-shaped metal layer;
an eleventh connection metal layer electrically connecting the fourth strip-shaped metal layer and the second strip-shaped metal layer;
4. The film capacitor according to claim 3, further comprising a twelfth connecting metal layer electrically connecting said seventh strip-shaped metal layer and said eighth strip-shaped metal layer.
A coupled capacitor comprising the film capacitor according to any one of claims 1 to 6 and a bus bar connecting a plurality of said film capacitors.
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 6.
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 8 .