Film capacitor, connected capacitor, inverter, and electric vehicle

Patent metadata

Field	Value
Publication number	US-12224129-B2
Application number	US-202118007238-A
Country	US
Kind code	B2
Filing date	Jul 1, 2021
Priority date	Jul 31, 2020
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A film capacitor includes a stack including at least one dielectric film and a plurality of metal films, the at least one dielectric film including a polyarylate film, wherein each of the at least one of dielectric film and each of the plurality of metal films are alternately stacked in a stacking direction, each of the plurality of metal films deposited on each of the at least one dielectric film by vapor deposition, cover films on two first side surfaces, the two first side surfaces facing each other in a first direction, the first direction orthogonal to the stacking direction, the cover films containing a polyester hot-melt resin, and metal-sprayed electrodes on two second side surfaces, the two second side surfaces facing each other in a second direction, the second direction perpendicular to the first direction and orthogonal to the stacking direction.

First claim

The invention claimed is:

1. A film capacitor comprising:
a stack including at least one dielectric film and a plurality of metal films, the at least one dielectric film including a polyarylate film, wherein each of the at least one of dielectric film and each of the plurality of metal films are alternately stacked in a stacking direction, each of the plurality of metal films deposited on each of the at least one dielectric film by vapor deposition;
cover films on two first side surfaces, the two first side surfaces facing each other in a first direction, the first direction orthogonal to the stacking direction, the cover films comprising a polyester hot-melt resin; and
metal-sprayed electrodes on two second side surfaces, the two second side surfaces facing each other in a second direction, the second direction perpendicular to the first direction and orthogonal to the stacking direction.

2. The film capacitor according to claim 1 , wherein
each cover film of the cover films has a thickness that is 0.1 μm, 1000 μm, or larger than 0.1 μm and smaller than 1000 μm.

3. A connected capacitor comprising:
a plurality of film capacitors including the film capacitor according to claim 2 ; and
a busbar connecting the plurality of film capacitors.

4. An inverter comprising:
a bridge circuit including a switching element; and
a capacitance portion connected to the bridge circuit, the capacitance portion including the film capacitor according to claim 2 .

5. A connected capacitor comprising:
a plurality of film capacitors including the film capacitor according to claim 1 ; and
a busbar connecting the plurality of film capacitors.

6. An inverter comprising:
a bridge circuit including a switching element; and
a capacitance portion connected to the bridge circuit, the capacitance portion including the film capacitor according to claim 1 .

7. An electric vehicle comprising:
a power supply;
the inverter according to claim 6 connected to the power supply;
a motor connected to the inverter; and
wheels drivable by the motor.

Assignees

• Kyocera Corp

Inventors

• Imagawa Kazuki
• Kikuchi Naoki
• Senoo Yuki
• Kobayashi Nobuhiro

Classifications

• B60L50/60

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• H01G4/32

  Wound capacitors · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• B60L2210/40

  DC to AC converters · CPC title

• H01G4/38

  Multiple capacitors, i.e. structural combinations of fixed capacitors · CPC title