阅读说明：本技术 用于电容器卷包的端侧的触点接通装置 (End-side contact-making device for capacitor wrappings ) 是由 P·利默 M·罗森贝格 T·贝纳 V·盖特纳 于 2019-06-12 设计创作，主要内容包括：本发明涉及一种用于电容器卷包的端侧的触点接通结构,所述触点接通结构用于单相或多相的杯形电容器的无焊点的构造,所述触点接通结构包括带有用于开关带的连接面的导电的弹簧元件和/或开关或保险丝,其中,弹簧元件沿着有待触点接通的相应端侧的表面延伸并且在那里形成贴靠。按照本发明,所述弹簧元件被构造为至少两指状的、波纹状的扁平弹簧条,其中,指状件实施为V形并且所述连接面位于所述指状件的交点中。按照本发明此外涉及一种单相或多相的杯形电容器,该杯形电容器带有前面介绍的用于该或这些卷包相互之间或者说与连接端子的内部电连接的触点接通结构。(The invention relates to a contact-making structure for the end faces of a capacitor winding for the solder-free formation of single-phase or multiphase cup-shaped capacitors, comprising an electrically conductive spring element and/or a switch or a fuse having a connection face for a switching strip, wherein the spring element extends along the surface of the respective end face to be contacted and forms an abutment there. According to the invention, the spring element is designed as at least two finger-like, corrugated flat spring strips, wherein the fingers are embodied in a V-shape and the connecting surface is located in the intersection of the fingers. The invention also relates to a single-phase or multiphase cup capacitor with the above-described contact structure for the electrical connection of the wraparound or wrappings with respect to one another or with the interior of the connecting terminals.)

1. contact-making structure for the end faces of a capacitor coil (1) for the solder-free formation of single-phase or multiphase cup-shaped capacitors, comprising an electrically conductive spring element (3) and/or a switch or fuse (5) with a connecting face for a switching strip (2), wherein the spring element (3) extends along the surface of the respective end face (10) to be contacted and forms an abutment there, characterized in that the spring element (3) is formed as at least two finger-like, corrugated flat spring strips, wherein the fingers (3; 30) are embodied in a V-shape and the connecting face is located in the intersection of the fingers (3; 30).

2. Contact-making structure according to claim 1, characterized in that the respective finger (3; 30) has a corrugated structure such that at least two contact sections are configured with reference to the surface of the respective end side (10) of the capacitor pack (1).

3. Contact construction according to claim 1 or 2, characterized in that the spring element is made of spring bronze material or another electrically conductive and weldable spring material.

4. Contact-making structure according to one of the preceding claims, characterized in that the respective switch strip is made of copper or aluminum material or another electrically conductive and solderable material.

5. Contact-making structure according to one of the preceding claims, characterised in that the flat spring strip has a corrugated structure, which corresponds to a sine curve or approximates a sine curve.

6. Contact structure according to one of claims 2 to 5, characterized in that the contact sections in a line contact the respective surface of the respective capacitor pack (1) without deformation and without destruction over the respective width of the flat spring strip.

7. Single-phase or multiphase cup-shaped capacitor having a cylindrical housing which can be closed by a cover, and having at least one internal switching strip (2) and connecting terminals which are fastened to the cover, wherein one or more axially stacked capacitor coils (1) are located in the housing, the capacitor coils (1) having end-side contact surfaces (10),

the capacitor coil (1) is characterized in that at least two finger-shaped, corrugated flat spring strips are provided for internal contacting of the contact surfaces on the respective end side, wherein the fingers (3; 30) are designed in a V-shape and the switch strip contact surfaces are located in the intersections of the fingers (3; 30).

8. The single-phase or multiphase cup-shaped capacitor as claimed in claim 7, characterized in that the respective fingers (3; 30) have a corrugated structure such that at least two contact sections are configured with reference to the surface of the respective end side (10) of the capacitor pack (1).

9. Single-or multi-phase cup-shaped capacitor according to claim 7 or 8, characterized in that the spring element is made of spring bronze material or another electrically conductive and weldable spring material.

10. The single-or multiphase cup capacitor in accordance with one of claims 7 to 9, wherein the flat spring strips have a corrugated structure, which corresponds to a sine curve or approximates a sine curve.

11. The single-or multiphase cup-shaped capacitor as claimed in one of claims 8 to 10, characterized in that the contact sections in a line contact the respective surface of the respective capacitor pack without deformation and without destruction over the respective width of the flat spring strip.

Technical Field

The invention relates to a contact-making structure for the end faces of a capacitor winding for the solderless construction of single-phase or multiphase cup-shaped capacitors, comprising an electrically conductive spring element and/or a switch or a fuse with a connection face for a switching strip, wherein the spring element extends along the surface of the respective end face to be contacted and bears there.

Background

DE 3443069 a1 discloses a capacitor with an end-side contact structure and comprising at least two capacitor packets. The wrappings are connected to one another in a solderless manner by electrically conductive contact springs via the end contact layers there. The contact spring is clamped with a fixing portion in a core hole of the capacitor pack and has a contact portion and a spring portion. The contact spring portion of the contact piece is embodied as a sharp edge and penetrates into the lower end-side contact layer.

GB 398929 a relates to a capacitor having a stack of alternating layers of conductive and dielectric material, wherein a wire element is rotated or wound around the stack in order to hold the stack under pressure. A portion of the wire unit is bent away from the stack so that an electrical connection can be established. The wire unit has spring properties in this respect.

DE 2451506C 2 discloses an ignition capacitor. The capacitor has a cup-shaped housing in which a winding made of metal is arranged in the circumferential direction of the housing. The wraparound comprises mutually insulated layers, one of which is in electrical contact with the housing and the other with the connecting body. The electrical connection between the housing and the respective layers of the wrapping is established by a spring washer inserted into the bottom of the housing, bearing against the housing. The spring washer has a simple corrugated structure and otherwise corresponds to the cylindrical shape of the housing.

In the case of a capacitor according to DE 19847028 a1 for a low-inductance intermediate circuit configuration, it is assumed that the winding is formed from a web of dielectric and electrically conductive material to which a film is applied, with an upper connection surface, a lower connection surface, an edge termination and a centrally located region without winding in the form of a sleeve which extends from the upper side to the lower side of the capacitor configuration. The sleeve is arranged for making contact with the connector. The contact structure is also realized as a press-contact point and has a contact portion made of an elastic material.

Spring contact arrangements for energy stores or capacitors are also known from EP 2697847B 1, GB 678334 a or GB 2065976A.

In the case of the roll-to-roll capacitor according to DE 2624334 a, a capacitor roll is accommodated in a cup-shaped or tubular housing. The end-side spacers of the wraparound serve as closure plates for the exterior of the housing and are connected to the housing in an air-tight and air-tight manner. The winding core has a radially injection-molded or press-fitted electrical connection through-hole which is accessible from the outside in the cavity of the winding core for the reception of a connector.

In one embodiment, the housing is cup-shaped and provided with an extended bead. In this variant, only one end-side spacer is formed on the winding core, which spacer serves as a closing plate. The second electrical lead-through for electrically conductive connection to the end face of the wraparound facing away from the cover sheet ends in a contact surface exposed at the lower end face of the wraparound core, which is arranged to interact with a radially crimped, electrically conductive and spring-elastic contact washer which is freely located on an insulating washer arranged on the cup bottom in such a way that, when an electrical contact with the contact washer is established, it presses down a central, convex, rounded bulge which is high in the relaxed state of the contact washer.

The electrical contact-making part which abuts against the end side of the wrapping should be pressed in this way.

The spring-elastic contact washer is itself approximately circular and is therefore very material-consuming. In the case of cyclic alternating loads, in particular mechanical loads, the spring-elastic contact washer cannot be sufficiently relieved of free space due to the selected design, so that damage to the contact end of the wraparound cannot be ruled out.

In the contact-making section for contacting the end-side contact-making layer, a contact-making carrier with a connection region for connecting an electrical conductor is present on the end side of the capacitor pack according to DE 102011104255B 4. The contact carrier is annular and the connection region has a terminal lug. At least one contact piece, which projects perpendicularly from the contact carrier, extends from the terminal lug and is provided with at least one contact tip which can be pressed into the end-side contact layer of the capacitor package. A sufficient electrical connection to the respective end-side contact layer should be achieved by pressing in the contact tips. In order to limit the penetration depth of the contact tip, a corresponding stop is provided.

In the solutions of the prior art, the permanent damage of the capacitor pack cannot be ruled out even in the case of mechanically and electrically permanent loads.

Disclosure of Invention

Starting from the foregoing, the object of the invention is to provide a further improved contacting structure for the end faces of a capacitor winding for the solderless construction of single-phase or multiphase cup capacitors, wherein the contacting structure should be particularly cost-effective to produce and moreover satisfy all mechanical and electrical loads, in particular also sufficiently high to withstand extreme vibrations.

The object of the invention is achieved by a contact structure according to the feature combination of claim 1 and by a single-phase or multiphase cup-shaped capacitor having a contact structure according to the invention.

The dependent claims represent at least suitable embodiments and further developments of the contact structure and of the cup capacitor.

Starting from the end-side contact-making structure of a capacitor winding of a solderless construction for single-phase or multiphase cup-shaped capacitors. The contact-making structure comprises an electrically conductive spring element having a connection face for a switching strip and/or a switch or a fuse.

The spring element extends along the surface of the respective end side to be contacted and forms an abutment there.

According to the invention, the spring element is designed as at least two finger-like, corrugated flat spring rails, wherein the fingers are designed in a V-shape and the connecting surface is located in the intersection of the fingers.

Although a V-shape is preferred, an approximate V-shape is also applied in accordance with the present invention. Combinations of V-shapes towards the direction forming W or M also fall into the solution according to the invention.

The respective fingers have a corrugated structure such that at least two contact sections are formed with reference to the respective end-side surface of the capacitor winding.

In a preferred embodiment, the spring element is made of spring bronze material, but the spring element can also be made of another electrically conductive and weldable spring material.

The switch strap may be made of a copper or aluminum material or another conductive and solderable material. The spring element can be electrically and mechanically connected to the respective switch strap by welding.

In a preferred embodiment, the flat spring rails have a corrugation which corresponds to a sine curve or approximates a sine curve.

The contact sections are arranged in a line across the respective width of the flat spring rails without pressing in and contacting the respective surface of the respective capacitor pack without destruction. The resulting wire contact, which is different from the point contact of the contact tips known from the prior art, eliminates damage by penetration into the surface of the end face of the wraparound. Surprisingly, it has been found that only slight pressure or shaking points can be detected in the spring element/end contact region in the results of extensive impact and vibration tests, but that electrically effective damage is not caused. In the case of repeated test-impact relief loading of the capacitor according to the invention using the contact-making structure according to the invention, no faulty, altered electrical properties are found.

The corrugated flat spring strips used according to the invention can be provided as strip material, cut to length accordingly and connected by spot welding or another electrically conductive connecting technique while achieving a V-shape. The length selection of the fingers involved here makes it possible to adapt to different wrapping diameters in a simple manner, without having to stock a plurality of wave springs of different circular dimensions, as is required in the prior art.

According to the invention, a single-phase or multiphase cup-shaped capacitor is also proposed, having a cylindrical housing which can be closed by a cover, wherein a capacitor pack or a plurality of axially stacked capacitor packs is/are located in the housing.

The capacitor winding has an end-side contact surface and at least one internal switching strip and a connecting terminal fixed to the cover.

According to the invention, at least two finger-like, corrugated flat spring strips are provided for the internal contacting of the contact surfaces on the respective end side of the respective wraparound, the fingers being of V-shaped design and the switch strip surfaces or other connecting surfaces being located in the intersection points of the fingers.

Drawings

The invention shall be explained in detail below with the aid of embodiments and the accompanying drawings.

Fig. 1 shows a capacitor arrangement in the form of a three-phase capacitor with a strip for electrical wiring and a spring element according to the invention.

Fig. 2 shows a spring element according to the invention in several views.

Detailed Description

The built-in structure shown in fig. 1 is inserted into a hollow-cylindrical, cup-shaped housing and is closed with a cover having a corresponding connection terminal. Depending on the embodiment, the cup can also be filled with gas or oil and have an overpressure protection, in particular in the form of an overpressure disconnection protection.

The construction and exemplary embodiment according to fig. 1 starts from a three-capacitor pack 1. The corresponding capacitor package comprises a dielectric made of a plastic film and two corresponding contact-making layers.

The switching strips 2 serve to electrically contact the individual capacitor packets 1. The switch strip 2 may be made of any electrically conductive material that allows a good electrical connection with the spring element 3, for example by a soldering process.

At the lower end and the upper end of the arrangement shown in fig. 1, a cap-shaped insulating element 4 is present, which corresponds to the dimensions of the housing, not shown. The upper insulator 4 has a through hole for passing a switch or fuse 5.

The ends of the switching strips 2 are each located in a bent manner on an insulating washer 6, which ends are electrically contacted to the respective switch or fuse 5.

The spring element 3 according to the invention is designed as at least two finger-like, corrugated flat spring strips.

The fingers 3 and 30 are embodied in a V-shape.

The connection face for either one end of the respective switching strip 2 or one respective end of the switch or fuse 5 is located at the finger 3; 30 in the intersection point.

Where electricity is required, the switch strip 2 is provided with an insulating sheathing structure in order to avoid short circuits and to ensure the necessary separation distance.

As can be seen in fig. 1, the corresponding fingers 3; 30 have a corrugated structure such that at least two contact sections are formed with reference to the surface of the respective end side 10 of the capacitor package 1.

Flat spring strips or fingers 3; 30 have a corrugation which corresponds to a sine curve or approximates a sine curve.

The contact sections of the flat spring rails are contacted without deformation and without destruction by the respective end side 10 of the respective wraparound. The contact sections are realized in a linear manner over the respective width of the flat spring rails. If the flat spring strips are selected to be wider, contact section lines of greater length are obtained, resulting in greater current carrying capacity.

The above-described contact-making structure is used in particular in single-phase or multiphase cup capacitors having a cylindrical housing which can be closed by a cover, wherein one or more axially stacked capacitor coils are located in the housing. The capacitor pack or the capacitor packs have contact surfaces on the end sides, as can be gathered from fig. 1. Furthermore, at least one switch strip and a connecting terminal fixed to the cover are provided.

The at least two finger-shaped, corrugated flat spring strips described above are used for contacting the inside of the respective end contact surfaces, wherein the fingers are designed in a V-shape and a switch strip contact surface is located in the intersection of the fingers.

After the arrangement according to fig. 1 has been inserted into a cup-shaped housing, not shown here, and is then closed by means of a cover, the stack is under an axial prestress which is built up by the corrugation of the flat spring strips, so that the desired contact-making safety with corresponding operating properties is achieved in all operating situations, in particular in the case of thermal and mechanical loading, with high long-term stability of the capacitor.

Figure 2 shows a finger 3 with a V-shape according to the invention; 30, various views of the spring element.

The perspective view and the side view according to fig. 2 show the fingers 3; 30 in a corrugated configuration.

The connection surface for the switching strip 2 is composed of two welded sections 20 in the example shown. The fingers 3; the corrugated structure of 30 is designed in such a way that at least two contact sections 31 are formed with reference to the surface of the capacitor package not shown in fig. 2; 32.