JP4577170B2 - Resin partition plate and method of manufacturing film capacitor using resin partition plate - Google Patents

Description

  The present invention relates to a resin partition plate used when forming a metallicon electrode on a capacitor element of a film capacitor, and a method of manufacturing a film capacitor using the resin partition plate.

  In recent years, film capacitors having higher withstand voltage, lower loss, and better temperature characteristics than aluminum electrolytic capacitors have been used in inverter systems for driving motors in hybrid vehicles. Since an in-vehicle capacitor is used even in a cold region or a high temperature and high humidity region, it is required to have a moisture resistance at a high temperature and a thermal shock resistance in a wide temperature range as compared with a consumer electric device. Further, there is a demand for a structure that reduces heat generation even when a high ripple current is passed.

  In particular, the parts called metallicon electrodes provided on both end faces of the capacitor element are provided for the purpose of electrically pulling out both poles of the capacitor formed by facing the metallized film from the both end faces of the element. The thickness of the metallicon electrode and the uniformity of the thickness are important factors affecting the suppression of heat generation of the film capacitor.

  FIG. 5 is a perspective view of a partition plate and a capacitor element used in forming a metallicon electrode of a conventional film capacitor. In FIG. 5, reference numeral 11 denotes a capacitor element. A metallized film in which a metal deposition electrode such as aluminum is formed on one or both sides of a dielectric film made of polypropylene or the like is opposed to a pair of metal deposition electrodes through the dielectric film. In this way, the positive and negative electrodes of the capacitor can be electrically drawn out from both end faces 11a.

  A partition plate 12 is used for partitioning the capacitor elements 11 so that the capacitor elements 11 do not adhere to each other when the metallicon electrodes described later are formed. Since the partition plate 12 is repeatedly used, it is often made of metal or the like.

  While aligning both end surfaces 11a of the plurality of capacitor elements 11 to be the same surface and holding them in a frame-like jig (not shown) together with the partition plate 12, a metal such as zinc is melted from the both end surfaces 11a side. Metallicon electrodes are formed on both end faces 11a by spraying.

For example, Patent Document 1 is known as prior art document information related to the invention of this application.
Japanese Patent No. 2648200

  However, in such a conventional configuration, both end surfaces 11a of the capacitor element 11 and the side surfaces of the partition plate 12 are covered with the metallicon electrodes when the metallicon electrodes are formed. Metallicon electrodes are also formed thick at the boundary between the surface 11 a and the partition plate 12, and when the partition plate 12 is removed, the metallicon electrode of the partition plate 12 may remain in the capacitor element 11 as a burr. It was.

  As a result, an unnecessary metallicon electrode is formed on the outer peripheral portion of the capacitor element 11, and there is a problem that it is necessary to remove this burr in the next step.

  Therefore, in order to solve the conventional problem, the present invention eliminates the burr on both end faces of the capacitor element even after the partition plate is removed when the metallicon electrode is formed in a state where a plurality of capacitor elements are partitioned by the partition plate. The object is to be able to show no good shape.

  In order to solve the above-described conventional problems, the present invention is directed to facing a flat resin partition plate that partitions each of a plurality of capacitor elements when a metallicon electrode is formed by spraying molten metal on both end faces of the capacitor element. The two sides are made to be inversely tapered.

  The capacitor of the present invention can be expected to suppress the heat generation of the capacitor product because the metallicon electrode can be formed in a good shape without burrs over the entire end faces of the capacitor element.

  Embodiment 1 of the present invention will be described below with reference to the drawings. The description of the same configuration as the conventional capacitor is omitted.

(Embodiment 1)
FIG. 1 is a perspective view of a resin partition plate and a capacitor element used in forming a metallicon electrode of a film capacitor in the present embodiment, and FIG. 2 is a perspective view of the resin partition plate in the present embodiment.

  In FIG. 1, reference numeral 1 denotes a capacitor element. A metallized film in which a metal deposition electrode such as aluminum is formed on one or both sides of a dielectric film made of polypropylene or the like is opposed to a pair of metal deposition electrodes with the dielectric film interposed therebetween. In this way, the positive and negative electrodes of the capacitor can be electrically drawn out from both end faces 1a, which are the winding end faces.

  1 and 2, reference numeral 2 denotes a resin partition plate, which is used for partitioning a plurality of capacitor elements 1 so that the capacitor elements 1 do not adhere to each other when forming the metallicon electrodes, and is flush with both end faces 1a. Convex portions 2a are provided on two opposing sides.

  The convex portion 2a has a reverse taper shape that increases in thickness as it goes further. The convex portion 2a is partitioned and arranged by the capacitor element 1 and the resin partition plate 2, and the capacitor element 1 and the resin partition plate are viewed from both ends 1a. The boundary with 2 is slightly hidden.

  It is one of the technical features in the present invention that the resin partition plate 2 is provided with the reverse tapered convex portion 2a. This resin partition plate 2 is used when forming a metallicon electrode, and in this way, the metallicon electrode can be formed in a good shape without burrs over the entire end faces 1a of the capacitor element 1. It will be possible.

  FIG. 3 is a schematic view showing a state when forming a metallicon electrode. FIG. 3A is a schematic diagram of the formation of the metallicon electrode in the present embodiment, and FIG. 3B is a schematic diagram of the conventional metallicon electrode formation.

  In FIGS. 3 (a) and 3 (b), reference numerals 3 and 13 denote metallized parts, which form metallized electrodes on both end faces 1a and 11a. Reference numerals 4 and 14 denote boundaries between the capacitor elements 1 and 11, the resin partition plate 2 and the partition plate 12, respectively.

  Conventionally, as shown in FIG. 3B, when the metallicon portion 13 is formed thicker, the boundary portion 14 between the capacitor element 11 and the partition plate 12 is also thickly covered by the metallicon portion 13. . When the partition plate 12 is removed from the capacitor element 11 in this state, the metallicon portion 13 formed on the partition plate 12 remains together with the capacitor element 11 and becomes a burr 15 as shown in FIG. It was. The burr 15 becomes a hindrance when a subsequent bus bar (not shown) is attached or when the capacitor element 11 is inserted into a resin case (not shown), causing problems.

  However, according to the present embodiment, as shown in FIG. 3A, the metallicon portion 3 of the boundary portion 4 is not formed thicker than in the prior art. By doing so, even if the resin partition plate 2 is removed from the capacitor element 1, there is a specific effect that no burr is generated in the capacitor element 1 as shown in FIG.

  This is because when the metallicon electrode is formed, molten metal is sprayed from the direction of both end faces 1a, so that a part of the metallicon part 3 that conventionally covered the boundary part 4 by the convex part 2a of the resin partition plate 2 is used. Is caused by covering the periphery of the convex portion 2a.

  In FIG. 1, the length of the convex portion 2 a is longer than the flat portion of the capacitor element 1 in contact with the resin partition plate 2. By doing so, it is possible to prevent the metallicon part 3 from being thickly formed at the boundary part 4. That is, it is only necessary that the boundary portion 4 between the capacitor element 1 and the resin partition plate 2 is hidden even when seen from the direction of both end faces 1a.

  Further, in the present embodiment, the resin partition plate 2 is made of resin, but this is because it is difficult to make the convex portion 2a in a reverse taper shape by using conventional metal. It can be manufactured at low cost and can be used up.

  Furthermore, in the present embodiment, the capacitor element 1 is wound. However, the same applies to a capacitor element that is laminated and then cut into a predetermined size.

  As described above, according to the resin partition plate and the film capacitor manufacturing method using the resin partition plate according to the present invention, heat generation of the film capacitor can be suppressed, so that an inverter system for driving a motor of a hybrid vehicle, etc. Useful for.

1 is a perspective view of a resin partition plate and a capacitor element according to Embodiment 1 of the present invention. The perspective view of the resin partition plate by Embodiment 1 of this invention (A) Schematic diagram of metallicon electrode formation according to Embodiment 1 of the present invention, (b) Schematic diagram of conventional metallicon electrode formation (A) Cross-sectional view of the metallicon electrode and resin partition plate according to Embodiment 1 of the present invention, (b) Cross-sectional view of the conventional metallicon electrode and partition plate Perspective view of conventional partition plate and capacitor element

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Both end surfaces 2 Resin partition plate 2a Convex part 3 Metallicon part 4 Boundary part 11 Capacitor element 12 Partition plate 13 Metallicon part 14 Boundary part 15 Burr

Claims (4)

Molten metal is applied to both end faces of a capacitor element obtained by laminating or winding a metallized film in which a metal vapor deposition electrode is formed on one or both sides of a dielectric film so that the pair of metal vapor deposition electrodes face each other with the dielectric film interposed therebetween. A plate-shaped resin plate that partitions each of the plurality of capacitor elements when sprayed to form a metallicon electrode, the resin partition plate having reverse-tapered convex portions on two opposing sides. The length of the convex part of the said resin partition plate is longer than the flat part of the said capacitor | condenser element which is in contact with the said resin partition plate, The resin partition plate of Claim 1 characterized by the above-mentioned. Molten metal is applied to both end faces of a capacitor element obtained by laminating or winding a metallized film in which a metal vapor deposition electrode is formed on one or both sides of a dielectric film so that the pair of metal vapor deposition electrodes face each other with the dielectric film interposed therebetween. In the method of forming a metallized electrode to be sprayed, a plurality of the capacitor elements are sandwiched by a frame-shaped jig, and each of the capacitor elements is used using a resin partition plate having reverse tapered convex portions on both end surfaces of the capacitor element. A method for producing a film capacitor in which a metallicon electrode is formed in a partitioned state. 4. The method of manufacturing a film capacitor according to claim 3, wherein a length of the convex portion of the resin partition plate is longer than a flat portion of the capacitor element in contact with the resin partition plate.

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