Power capacitor

Patent metadata

Field	Value
Publication number	US-9991053-B2
Application number	US-201013519387-A
Country	US
Kind code	B2
Filing date	Nov 5, 2010
Priority date	Dec 29, 2009
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A power capacitor, in particular a DC link capacitor, having a capacitor housing which has a first housing wall, in particular made of metal, which is galvanically connectable to a housing of an electronics unit, in particular a power electronics unit, and planar energizing units for energizing the power capacitor. A first subregion of a first energizing unit extends in an inner space of the housing adjacent to and at a distance from the first housing wall or from a different housing wall of the capacitor housing that is conductively connected to the first housing wall. A layer made of a dielectric material other than air is situated between the first subregion of the first energizing unit and this housing wall.

First claim

What is claimed is:

1. A DC link power capacitor mountable on a housing wall of a power electronics unit, comprising:
planar energizing units to energize the power capacitor, a first subregion of a first one of the energizing units, in the mounted state, extending adjacent to and at a distance from the housing wall of the electronics unit; and
a layer made of a dielectric material other than air situated between the first subregion of the first one of the energizing units and the housing wall of the electronics unit;
wherein the energizing units extend such that two planar surfaces of the energizing units are overlapping and at a distance from one another for at least a majority of a length of the energizing units, and a layer made of the dielectric material other than air is situated in a second subregion between the planar surfaces of the energizing units, wherein, for at least the majority of the length of the energizing units, only the layer made of the dielectric material other than air is situated between the planar surfaces of the energizing units.

2. A DC link power capacitor, comprising:
a capacitor housing which has a first housing wall made of metal which is galvanically connectable to a housing of a power electronics unit; and
planar energizing units to energize the power capacitor, a first subregion of a first one of the energizing units extending in an inner space of the capacitor housing adjacent to and at a distance from one of the first housing wall, or from a different housing wall of the capacitor housing that is conductively connected to the first housing wall;
wherein a layer made of a dielectric material other than air is situated between the first subregion of the first one of the energizing units and the one of the first housing wall or the different housing wall; and
wherein the energizing units extend such that two planar surfaces of the energizing units are overlapping and at a distance from one another for at least a majority of a length of the energizing units, and a layer made of a dielectric material other than air is situated in a second subregion between the planar surfaces of the energizing units, wherein, for at least the majority of the length of the energizing units, only the layer made of the dielectric material other than air is situated between the planar surfaces of the energizing units.

3. The power capacitor as recited in claim 1 , wherein the second subregion corresponds to the first subregion.

4. The power capacitor as recited in claim 2 , wherein the first subregion of the first energizing unit is formed by a first busbar which is connected in an electrically conductive manner to a first planar contact bar which extends along a second housing wall of the capacitor housing, adjacent to and at a distance from same, and a second one of the energizing units includes a second busbar which is connected in an electrically conductive manner to a planar second contact bar in an overlapping manner and at a distance from the first busbar, the planar second contact bar extending along a side of the capacitor housing situated opposite from the second housing wall, and the contact bars are to energize at least one capacitor element.

5. The power capacitor as recited in claim 4 , wherein a layer made of a dielectric material other than air is situated between the first contact bar and the second housing wall.

6. The power capacitor as recited in claim 4 , wherein one of the contact bars is electrically connected to a planar, additional busbar which extends along a third housing wall of the capacitor housing situated opposite from the first housing wall, and a layer made of a dielectric material other than air is situated between the additional busbar and the third housing wall.

7. The power capacitor as recited in claim 2 , wherein the layer made of dielectric material is one of a dielectric film, a dielectric gel, or a dielectric resin.

8. The power capacitor as recited in claim 2 , wherein the dielectric material is suitable for high-frequency technology.

9. The power capacitor as recited in claim 2 , wherein the capacitor housing has an open side, which is closed off using a sealing compound.

10. An electronic module, comprising:
a pulse-controlled inverter having a housing; and
a power capacitor mounted on the pulse-controlled inverter so that a galvanic connection results between adjoining housing walls, the power capacitor including a capacitor housing which has a first housing wall made of metal which is galvanically connected to the housing of the pulse-controlled inverter, the power capacitor further including a capacitor housing which has a first housing wall made of metal which is galvanically connectable to a housing of a power electronics unit, and planar energizing units to energize the power capacitor, a first subregion of a first one of the energizing units extending in an inner space of the capacitor housing adjacent to and at a distance from one of the first housing wall, or from a different housing wall of the capacitor housing that is conductively connected to the first housing wall, wherein a layer made of a dielectric material other than air is situated between the first subregion of the first one of the energizing units and the one of the first housing wall or the different housing wall, and wherein the energizing units extend such that two planar surfaces of the energizing units are overlapping and at a distance from one another for at least a majority of a length of the energizing units, and a layer made of a dielectric material other than air is situated in a second subregion between the planar surfaces of the energizing units, wherein, for at least the majority of the length of the energizing units, only the layer made of the dielectric material other than air is situated between the planar surfaces of the energizing units.

Assignees

• Sparka Hartmut
• Bosch Gmbh Robert

Inventors

• Sparka Hartmut

Classifications

• Y02T10/7022

  Cross-Sectional Technologies · mapped topic

• H01G4/228 Primary

  Terminals · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title