JP2009194280A - Case-molded capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve performance and reduce costs in a case-molded capacitor used for a hybrid automobile, or the like. <P>SOLUTION: A cell in which a pair of a P-pole busbar 2 and an N-pole busbar 3 are connected to an element 1 is stored in a case 5 for resin-molding, a junction joined to the electrode of the element 1 is provided at one end and a terminal is provided at the other end in the P-pole busbar 2 and the N-pole busbar 3, and a soldering section 3 soldered and joined to the electrode of the element 1 is provided at least at three locations of the junction for soldering and joining to the electrode of the element 1 excluding one portion positioned at the end of the soldering section, thereby enabling handling as one cell, composing a pair of busbars in small and simple shapes for improving material yields and enabling sharing the same busbar even for a different model for cost reduction. <P>COPYRIGHT: (C)2009,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.

  6 is an exploded perspective view showing the structure of this type of conventional case mold type capacitor, FIG. 7 is a cross-sectional view taken along line AA of FIG. 6, and in FIGS. 6 and 7, 10 is a metallized film capacitor. This capacitor 10 is a pair of metallized films in which metal vapor-deposited electrodes are formed on one or both sides of a dielectric film made of polypropylene, and the metal vapor-deposited electrodes are opposed to each other with the dielectric film interposed therebetween. In this state, a pair of extraction electrodes of P and N poles are provided respectively by forming metallicon electrodes with zinc sprayed on both end faces.

  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, the shapes of the P-pole bus bar 11 and the N-pole bus bar 12 in which a plurality of capacitors 10 are connected in parallel (the bus bar shown in FIG. 6 is shown as an example. However, not only is the material yield low, but there is a problem that the cost is high because a dedicated design is required for each model.

  In addition to the demands for small size, large capacity, high voltage resistance, high heat resistance, etc., recently there are also high demands for reduction of ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance), and further enhancement of performance is achieved. There was also a problem that it was necessary.

  An object of the present invention is to solve such a conventional problem and to provide a case mold type capacitor that achieves both high performance and low cost.

  In order to solve the above problems, the present invention provides a cell in which a first bus bar is connected to one electrode of an element provided with a pair of electrodes on both end faces, and a second bus bar is connected to the other electrode; A case in which a plurality of cells are accommodated in parallel and a mold resin filled in the case, and the first bus bar and the second bus bar are provided at one end with a joint portion to be joined to the element electrode. In addition, a terminal portion is provided at the other end, and at least three tongue-like soldering portions to be soldered and joined to the electrode of the element are provided at the joining portion, and one location located at the end of the soldering portion is provided. Except for this, it is configured to be soldered to the electrode of the element.

  As described above, the case mold type capacitor according to the present invention has a configuration in which a pair of bus bars are handled as one cell by connecting the pair of bus bars to one element, and thus the pair of bus bars can be made small and simple in shape. Because it can be configured, not only can the yield of materials be improved, but the same bus bar can be shared and used for different models, so that the cost can be reduced. An effect is obtained.

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

  1A to 1D are a rear view, a plan view, a front view, and a side view showing the configuration of a case mold type capacitor according to an embodiment of the present invention, and FIGS. 2A to 2C are the same. A rear view, a plan view, and a front view showing a cell used in a case mold type capacitor, and FIGS. 3A to 3C are views showing an example in which elements having different functions are connected to the cell shown in FIG. 4 (a) to 4 (d) are a plan view, a front view, a side view, and a perspective view showing the first bus bar used in the cell shown in FIG. (a)-(d) is the top view, front view, side view, and perspective view which showed the 2nd bus bar.

  1 to 5, reference numeral 1 denotes a metallized film capacitor (hereinafter referred to as "element 1") having an oval cross section, and this element 1 has a metal vapor-deposited electrode formed on one or both sides of a dielectric film made of polypropylene film. A pair of the metallized films (not shown) is wound in a state where the metal vapor-deposited electrodes face each other with a dielectric film interposed therebetween, and then pressed into a flat shape with an oval cross section. A pair of extraction electrodes, that is, a P-electrode 1a and an N-electrode 1b made of a metallicon electrode sprayed with zinc, are provided.

  Reference numeral 2 denotes a P-pole bus bar connected to a P-pole electrode 1a which is one electrode of the element 1, and the P-pole bus bar 2 has a substantially L-shaped conductive metal plate as shown in detail in FIG. Are formed by punching and bending at the one end, a joint portion 2a to be joined to the P-electrode 1a is provided at one end, a terminal portion 2b is provided at the other end, and a flat portion at the center portion is arranged on the outer peripheral surface of the element 1. It is intended to be installed. In addition, at the tip portion of the joint portion 2a joined to the P-electrode 1a, tongue-like soldering portions 2c formed so as to branch from the joint portion 2a are provided at three locations. Among the 2c, two soldering portions 2c except one soldering portion 2c located at the end are soldered and connected to the P-electrode 1a (FIGS. 3A to 3C). ).

  Reference numeral 3 denotes an N-pole bus bar connected to the N-pole electrode 1b which is the other electrode of the element 1, and the N-pole bus bar 3 has a substantially L-shaped conductive metal plate as shown in detail in FIG. It is formed by punching and bending, and is provided with a joint part 3a joined to the N-electrode 1b at one end and a terminal part 3b at the other end. Further, at the tip portion of the joint portion 3a joined to the N-electrode 1b, tongue-like soldering portions 3c formed so as to branch from the joint portion 3a are provided at three locations. 3c, two soldering portions 3c except one soldering portion 3c located at the end are soldered to the N-electrode 1b (FIGS. 3A to 3C). ) In this way, a device in which a pair of bus bars (P-pole bus bar 2 and N-pole bus bar 3) are connected to one element 1 (in this embodiment, a smoothing element is used) Call.

  Reference numeral 4 denotes a metallized film capacitor (hereinafter referred to as an element 4) having a function different from that of the element 1, and in the present embodiment, a noise removing element generally called a Y-con is used. As shown in detail in FIG. 3, two elements 4 are used, and one element 4 branches from a junction 2a provided at one end of the P-pole bus bar 2 constituting the cell. The P-electrode 4a of the element 4 is soldered and connected to one soldering part 2c located at the end of the formed soldering part 2c.

  The other element 4 is one of the soldering portions 3c formed so as to branch from the joint portion 3a provided at one end of the N-pole bus bar 3 constituting the cell. The N pole electrode 4b of the element 4 is soldered and connected to the soldering portion 3c, and the two elements 4 are connected in series by a connection member (not shown).

  Reference numeral 5 denotes a resin case. The cell and the cell connected to the element 4 are accommodated in the case 5 in parallel and filled with an insulating mold resin (not shown). A mold type capacitor is constructed.

  The case mold type capacitor according to the present embodiment configured as described above is handled as one cell by connecting a pair of bus bars (P pole bus bar 2 and N pole bus bar 3) to one element 1. With this configuration, a pair of bus bars can be configured in a small and simple shape, so that not only can the material yield be improved, but the same bus bar can be shared for different models. As a result, it is possible to reduce the price to achieve the special effect.

  Further, the P pole bus bar 2 is provided with a flat surface portion, and this flat surface portion is disposed on the outer peripheral surface of the element 1, thereby canceling a part of the magnetic field generated by the current flowing through the element 1 and ESL. There is also a special effect that can be reduced.

  Furthermore, by changing the soldering positions of the soldering portions 2c and 3c of the joint portions 2a and 3a provided on the P-pole bus bar 2 and the N-pole bus bar 3 with respect to the P-pole electrode 1a and the N-pole electrode 1b, The P-electrode 1a and N-electrode 1b of the element 1 of the cell adjacent to the soldering portions 2c, 3c can be soldered and joined, and there is a special effect that a wide range of applications are possible. Is.

  The case mold type capacitor according to the present invention has an effect that it is possible to achieve both high performance and low price, and is particularly useful in the field of hybrid vehicles and the like.

(A) The rear view which showed the structure of the case mold type capacitor by one embodiment of this invention, (b) The top view, (c) The front view, (d) The side view (A) The rear view which showed the cell used for the case mold type capacitor, (b) The same top view, (c) The same front view (A) Rear view showing an example in which elements having different functions are connected to the cell shown in FIG. 2, (b) The same plan view, (c) The same front view (A) The top view which showed the 1st bus-bar used for the cell shown in FIG. 2, (b) The front view, (c) The side view, (d) The perspective view (A) Plan view showing the second bus bar, (b) Front view, (c) Side view, (d) Perspective view An exploded perspective view showing a configuration of a conventional case mold type capacitor Sectional drawing in the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 4 Elements 1a P pole electrode 1b N pole electrode 2 P pole bus bar 2a, 3a Joint part 2b, 3b Terminal part 2c, 3c Soldering part 3 N pole bus bar 5 Case

Claims (6)

A case in which a first bus bar is connected to one electrode of an element having a pair of electrodes on both end faces and a second bus bar is connected to the other electrode, and a case in which a plurality of these cells are accommodated in parallel And the mold bus filled in the case, the first bus bar and the second bus bar are provided with a joint portion to be joined to the electrode of the element at one end and a terminal portion at the other end, and Three or more tongue-shaped soldering parts to be soldered and bonded to the element electrodes are provided in the bonding part, and the element electrodes are soldered and bonded except for one position located at the end of the soldering part. Case mold type capacitor. 2. The case mold type capacitor according to claim 1, wherein terminal portions provided on the first bus bar and the second bus bar constituting the cell are arranged in the same direction. The case mold type capacitor according to claim 1, wherein a flat portion disposed on the outer peripheral surface of the element is provided at a central portion of the first bus bar. An electrode of an element having a different function is soldered and joined to one soldering part that is not soldered and joined to an electrode of an element of a joint provided at one end of each of the first bus bar and the second bus bar. The case mold type capacitor according to 1. Claims in which the electrode of the element of the adjacent cell is soldered and joined to one soldered part which is not soldered and joined to the electrode of the element of the joint provided at one end of each of the first bus bar and the second bus bar. Item 2. A case mold type capacitor according to item 1. As a device, a metallized film in which a metallized electrode is formed on a metal film by winding a pair of metallized films with metallized electrodes on a dielectric film so that the metallized electrodes face each other through the dielectric film. The case mold type capacitor according to claim 1, wherein a filmed film capacitor is used.

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