JP2009231524A - Case molded capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a case molded capacitor dealing with current increase and capacitance increase and being used for a hybrid vehicle or the like. <P>SOLUTION: A fastening part 3 is provided on one side face of a case 5 for a case molded capacitor in which an element connecting a bus bar 4 comprising a connecting part 4b to one terminal thereof is housed within the case 5 and resin-molded and by abutting and coupling the fastening parts 3 of two cases 5 while disposing the connecting part 4b provided in the bus bar 4 in the fastening part 3, two case molded capacitors are electrically and mechanically connected. Thus, since the case 5 is reduced in size, a mold resin 6 can be uniformly injected into the case 5 thereby performing high-quality molding and further, bisected capacitors are electrically and mechanically connected, thereby dealing with current increase and capacitance increase. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention is used in various electronic equipment, electrical equipment, industrial equipment, automobiles, etc., and in particular, a metallized film capacitor that is optimal for smoothing, filtering, and snubbing of a motor drive inverter circuit of a hybrid car is accommodated in a case. And a resin-molded case mold type capacitor.

  In recent years, from the viewpoint of environmental protection, all electrical devices are controlled by inverter circuits, and energy saving and high efficiency are being promoted. In particular, in the automobile industry, hybrid vehicles (hereinafter referred to as HEVs) that run on electric motors and engines have been introduced into the market, and the development of technologies relating to energy saving and high efficiency has been activated, which is friendly to the global environment.

  Since such a HEV electric motor has a high operating voltage range of several hundred volts, a metallized film capacitor having high withstand voltage and low loss electric characteristics as a capacitor used in connection with such an electric motor. In addition, the trend of adopting metalized film capacitors with a very long life is conspicuous due to the demand for maintenance-free in the market.

  And since the metallized film capacitor used for HEVs in this way is required to have a high withstand voltage, large current, large capacity, etc., a plurality of metallized films connected in parallel by bus bars. A case mold type capacitor in which a capacitor is housed in a case and a mold resin is poured into the case has been developed and put into practical use.

  FIG. 5 is an exploded perspective view showing the structure of this type of conventional case mold type capacitor. In FIG. 5, 10 indicates a metallized film capacitor (hereinafter referred to as a capacitor), and the capacitor 10 is made of polypropylene. A pair of metallized films with metal-deposited electrodes formed on one or both sides of a dielectric film are wound in a state where the metal-deposited electrodes face each other with a dielectric film between them, and metallized electrodes are sprayed on both ends to form a metallized electrode By doing so, a pair of extraction electrodes of P and N poles are provided.

  Reference numeral 11 denotes a P-pole bus bar, and 11a denotes a P-pole terminal for external connection provided at one end of the P-pole bus bar 11. The P-pole bus bar 11 includes a plurality of capacitors 10 in close contact with each other. The P electrode 10 is joined to a P electrode formed on one end face, and the P electrode terminal 11a is pulled out above the capacitor 10 and exposed from a case 13 described later.

  Reference numeral 12 denotes an N-pole bus bar, and 12a denotes an N-pole terminal for external connection provided at one end of the N-pole bus bar 12. The N-pole bus bar 12 also includes a plurality of capacitors 10 in the same manner as the P-pole bus bar 11. The N pole electrodes formed on the other end face of each capacitor 10 are joined together in close contact, and the N pole terminal 12a is pulled out above the capacitor 10 and exposed from a case 13 described later. Thus, a plurality of capacitors 10 are connected in parallel connection by the P-pole bus bar 11 and the N-pole bus bar 12.

  Reference numeral 13 denotes a resin case, and reference numeral 14 denotes a mold resin filled in the case 13. The mold resin 14 is connected in parallel by the P-pole bus bar 11 and the N-pole bus bar 12. Is housed in the case 13 and resin molded.

  The conventional case mold type capacitor configured as described above is a highly reliable case mold type excellent in mechanical strength, heat resistance and water resistance by molding the capacitor 10 in the case 13 with the mold resin 14. Capacitors could be provided.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-146724 A

  However, in the conventional case mold type capacitor, it is necessary to enlarge the element 10 or increase the quantity of the element 10 in order to meet the recent demand for large current and large capacity. As a matter of course, when the countermeasure is taken, the case 13 becomes larger and the amount of the mold resin 14 also increases.

  Thus, when the case 13 becomes large and the amount of the mold resin 14 increases, not only the casting time for casting the mold resin 14 into the case 13 is lengthened, but also one of the thermosetting mold resins 14. This causes a problem that the part starts to harden during the casting operation, and thus there is a problem that the workability is deteriorated and the quality problem that the molding resin 14 cannot be uniformly cast occurs.

  An object of the present invention is to solve such a conventional problem, and to provide an excellent case mold type capacitor that does not affect both productivity and quality even when a large current and a large capacity are achieved. To do.

  In order to solve the above problems, the present invention provides a bus bar in which a plurality of elements are connected by a bus bar having an external connection terminal portion at one end and a connecting portion at the other end, and these are accommodated in a case. The first case mold type capacitor that is resin-molded except for the terminal part and the connecting part, and the second case mold type capacitor that is configured in the same manner, the first case mold type capacitor and the second case mold type A fastening portion is provided on one side surface of each case constituting the mold capacitor, the fastening portions of the two cases are faced to each other, and a connecting portion provided at the other end of the bus bar is disposed on the fastening portion. The first case mold type capacitor and the second case mold type capacitor are electrically and mechanically connected by joining the fastening portions in a state. That.

  As described above, the case mold type capacitor according to the present invention has a two-divided structure, so that the case is downsized so that the mold resin can be uniformly poured into the case without deteriorating workability. Therefore, it becomes possible to perform high quality casting work, and it is possible to cope with higher current and higher capacity by electrically and mechanically connecting the two parts. The effect is obtained.

(Embodiment)
Hereinafter, the invention described in the entire claims of the present invention will be described by using embodiments.

  1A to 1C are a plan view, a front view, and a side view showing a configuration of a case mold type capacitor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 3A to 3C are a plan view, a front view, and a side view showing a configuration of one case mold type capacitor used in the case mold type capacitor, and FIG. 4 is a line BB in FIG. FIG. 1 is a cross-sectional view, and in FIGS. 1 to 4, reference numeral 1 denotes a first case mold type capacitor, and 2 denotes a second case mold type capacitor. In the present embodiment, the first case mold type capacitor 1 And the second case mold type capacitor 2 are the same, and are arranged by changing the position 180 degrees (inverted) and connected by a fastening portion 3 (details will be described later).

  The first case mold type capacitor 1 (the same applies to the second case mold type capacitor 2) has a plurality of metallized film capacitor elements (not shown) provided with a pair of electrodes on both end faces, and one end is externally connected. The connecting terminal portion 4a is connected by a metal bus bar 4 provided with a connecting portion 4b at the other end, and these are accommodated in a resin case 5 and molded resin 6 using an epoxy resin or the like. It is constituted by molding.

  Reference numerals 5a to 5d denote tongue-like coupling portions that are integrally provided at different positions on one side surface of the case 5 and constitute the fastening portion 3. A flange nut 7 is inserted into the coupling portions 5a and 5b by insert molding. In addition, a metal collar 8 is disposed on the coupling portions 5c and 5d by insert molding. Further, the collar 8 is configured to protrude from the upper surface and the lower surface of the coupling portions 5c and 5d, respectively. It is what has been.

  In addition, two of the connecting portions 4b provided on the other end of the bus bar 4 and exposed from the mold resin 6 are positioned on the connecting portions 5a and 5b with predetermined intervals, and the remaining two are connected. It is located on the portions 5c and 5d, and is in contact with the upper end surface of the collar 8 that is insert-molded in the coupling portions 5c and 5d.

  And two cases 5 constituted in this way are arranged, and one side surface provided with joint parts 5a-5d is made to face each other and face each other, so that the other on top of joint part 5a of one case 5 The connecting portion 5d of the case 5 and the connecting portion 4b provided at the other end of the bus bar 4 overlap each other. Similarly, the connecting portion 5c, the connecting portion 4b, and the connecting portion 4b are connected to the connecting portion 5b. The coupling portion 5b and the coupling portion 5a overlap each other under the coupling portion 5c that abuts on the upper surface and the coupling portion 5d that the coupling portion 4b abuts on the upper surface, respectively. In this state, the bolt 9 is connected to the flange nut. 7 to each other, thereby connecting the connecting portions in pairs, that is, connecting portions 5a and 5d, 5b and 5c, 5c and 5b, and 5d and 5a, respectively. Two cases 5 are connected electrically and mechanically. It is obtained by way.

  At this time, since the collar 8 insert-molded in the coupling portions 5c and 5d is configured to protrude from the upper surface and the lower surface of the coupling portions 5c and 5d, the bolt 9 and the flange nut 7 are high. The fastening strength can be ensured and the electrical connection between the connecting portions 4b provided at the other end of the bus bar 4 can be reliably performed.

  Since the case mold type capacitor according to the present embodiment configured as described above has a two-part structure, the case 5 is reduced in size, and thus the mold resin 6 is uniformly poured into the case 5 without reducing workability. Since it becomes possible to mold, it becomes possible to perform high quality casting work, and it is possible to increase current and capacity by electrically and mechanically connecting the divided parts. There is a special effect that it becomes possible to cope.

  In the present embodiment, an example using the first case mold capacitor 1 and the second case mold capacitor 2 configured in the same manner as the two-divided structure has been described. However, the present invention is not limited to this. However, the present invention is not limited to this, and two case mold capacitors configured differently may be connected.

  Similarly, the arrangement position, shape, number, and the like of the coupling portions 5a to 5d constituting the fastening portion 3 are not limited to this, and the two coupling portions can be overlapped. It doesn't matter.

  The case mold type capacitor according to the present invention has an effect that it can cope with an increase in current and an increase in capacity with high quality, and is particularly useful as a capacitor for an automobile such as a hybrid car.

(A) The top view which showed the structure of the case mold type capacitor by one Embodiment of this invention, (b) The front view, (c) The side view Sectional drawing in the AA line of FIG. (A) The top view which showed the structure of one case mold type capacitor used for the case mold type capacitor, (b) The front view, (c) The side view Sectional drawing in the BB line of FIG. An exploded perspective view showing a configuration of a conventional case mold type capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st case mold type capacitor 2 2nd case mold type capacitor 3 Fastening part 4 Bus bar 4a Terminal part for external connection 4b Connection part 5 Case 5a, 5b, 5c, 5d Connection part 6 Mold resin 7 Flange nut 8 Color 9 volts

Claims (3)

A plurality of elements each provided with a pair of electrodes on both end faces are connected in parallel and connected to each other by a bus bar having an external connection terminal portion at one end and a connecting portion at the other end. The first case mold type capacitor which is resin-molded except for the terminal portion and the connecting portion of the bus bar, and the second case mold type capacitor configured in the same manner, and includes the first case mold type capacitor and the second case mold type capacitor. A fastening part is provided on one side surface of each case constituting the case mold type capacitor, the fastening parts of the two cases are opposed to each other, and a connecting part provided at the other end of the bus bar is arranged on the fastening part. The first case mold type capacitor and the second case mold type capacitor are electrically and mechanically connected by joining the fastening portions in the installed state. Sumorudo type capacitor. A fastening portion provided on one side surface of each case constituting the first case mold type capacitor and the second case mold type capacitor is constituted by a plurality of tongue-like coupling portions, and thus configured 2 2. The case mold type capacitor according to claim 1, wherein a plurality of tongue-like coupling portions overlap each other in a state where the fastening portions of two cases face each other and face each other. Fastening portions, which are made by joining two overlapping tongue-like joining portions in a set, are connected by a bolt and a nut through a metal collar, and both ends of the collar are connected to the bus bar. The case mold type capacitor according to claim 2, wherein the case mold type capacitor is in contact with a connecting portion and a nut provided at the other end.

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