JP2013222883A - Capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor whose costs can be reduced in comparison with the conventional case.SOLUTION: A capacitor 10 is constituted by preparing a plurality of unit capacitors 20 with the same capacitance including elements 21, and P side bus bars 22 and N side bus bars 23 to be fixed to the elements 21, and adjusting the number of the plurality of unit capacitors 20 to be set in a housing case 30. Thus, capacitors 10 with different capacitance for every vehicle type can be manufactured only by changing the number of unit capacitors 20 to be housed in the housing case 30 for every vehicle type. In this structure, since the structure of the unit capacitor 20 can be communized, costs of the capacitor 10 can be reduced in comparison with the conventional case.

Description

  The present invention relates to a capacitor used in an automobile or the like.

  An electric vehicle using an electric motor as a drive source, a hybrid vehicle using an engine and an electric motor together, and the like are equipped with a capacitor. For example, as disclosed in Japanese Patent Application Laid-Open No. 2008-288242, the capacitor is an element. And a bus bar fixedly attached to the element are accommodated in a case member, and the case member is filled with an epoxy resin, which is a thermosetting resin, and cured, thereby removing a terminal portion for external connection of the bus bar. The element and busbar are wrapped with epoxy resin.

In general, the capacitance required for a capacitor differs for each vehicle type. Therefore, conventionally, capacitors having different capacitances (different product numbers) are prepared and used for each vehicle type.

However, the conventional capacitor has the following problems.
Since capacitors having different capacitances (different product numbers) are prepared and used for each vehicle type, it is difficult to make the capacitors common to each vehicle type. For this reason, mass production due to the common use of capacitors is difficult, and it is difficult to reduce the cost of the capacitors.

JP 2008-288242 A

  The objective of this invention is providing the capacitor which can aim at cost reduction compared with the past.

The present invention for achieving the above object is as follows.
(1) Prepare a plurality of unit capacitors of the same electrostatic capacity including an element and a P-side bus bar and an N-side bus bar fixed to the element, and adjust the number of the plurality of unit capacitors to be set in a storage case Capacitor.
(2) The number of the plurality of unit capacitors is adjusted such that the total capacitance when the unit capacitors are connected in parallel is equal to the capacitance required for the entire capacitor. Capacitor.
(3) The unit capacitor includes a metal case member in which the element is housed and the P-side bus bar and the N-side bus bar extend from the inside to the outside, and the inside of the case member is filled with the P A resin member that wraps the element, the P-side bus bar, and the N-side bus bar except for a portion of the side bus bar that is located outside the case member and a portion that is located outside the case member of the N-side bus bar; A capacitor according to (1) or (2).
(4) The housing case is a case in which a P-side bus bar of the unit capacitor set in the housing case is fitted and a N-side bus bar of the unit capacitor set in the housing case. A capacitor according to any one of (1) to (3), comprising: a side N-side bus bar.

According to the capacitor (1) or (2), the following effects can be obtained.
For each vehicle type, a plurality of unit capacitors of the same capacitance having an element and a P-side bus bar and an N-side bus bar fixed to the element are prepared, and the number of the plurality of unit capacitors is adjusted and set in a storage case. By simply changing the number of unit capacitors housed in the housing case, it is possible to manufacture capacitors having different capacitances for each vehicle type. In this structure, the unit capacitor configuration can be shared, so that the capacitor cost can be reduced as compared with the conventional case.

According to the capacitor (3), the following effects can be obtained.
Since the unit capacitor includes the metal case member, the case member can prevent water vapor (moisture) around the case member from entering the case member. Therefore, compared to the case where the unit capacitor does not include a metal case member, the amount of epoxy resin used for the water vapor barrier can be reduced, and the unit capacitor can be reduced in size and cost can be reduced. it can.
Further, since the case member is made of metal, heat generated in the element, the P-side bus bar, and the N-side bus bar can be radiated to the outside of the case member, and the heat can be prevented from being accumulated in the unit capacitor.

According to the capacitor (4), the following effects can be obtained.
The housing case includes a case-side P-side bus bar into which the P-side bus bar of the unit capacitor set in the housing case is fitted, and a case-side N-side bus bar into which the N-side bus bar of the unit capacitor set into the housing case is fitted. Therefore, the unit capacitor can be set in the housing case simply by fitting the P-side bus bar of the unit capacitor into the case-side P-side bus bar and fitting the N-side bus bar of the unit capacitor into the case-side N-side bus bar. Therefore, no adhesive or sealant is required to set the unit capacitor in the storage case, and the unit capacitor is stored compared to the case where an adhesive or sealant is required to set the unit capacitor in the storage case. Can be easily set in the case at low cost.

The capacitor | condenser of this invention Example is a schematic diagram which the unit capacitor | condenser showed by planar view and the storage case was shown by sectional view. It is an expanded sectional view of a unit capacitor of a capacitor of an example of the present invention. However, the cross-sectional display of the element is omitted for clarity of the drawing.

Hereinafter, a capacitor according to an embodiment of the present invention will be described with reference to the drawings.
A capacitor (which may be called a capacitor device) 10 according to an embodiment of the present invention is mounted on an electric vehicle using an electric motor as a drive source, a hybrid vehicle using an engine and an electric motor in combination, or the like. As shown in FIG. 1, the capacitor 10 includes a plurality of unit capacitors 20 having the same electrostatic capacity, and a storage case 30 in which the plurality of unit capacitors 20 are adjusted (set) in number. Have.

  As shown in FIG. 2, the unit capacitor 20 includes an element 21, a P-side bus bar 22, an N-side bus bar 23, a case member 24, and a resin member 25.

  The element 21 is constituted by winding or laminating a dielectric film provided with a metal vapor deposition electrode. A P-side metallicon electrode 21a is provided at one end of the wound or laminated one, and the N-side is provided at the other end. A metallicon electrode 21b is provided. The element 21 is entirely located inside the case member 24 and is accommodated inside the case member 24.

  The P-side bus bar 22 and the N-side bus bar 23 are made of metal (for example, made of copper), and are long and thin. The P-side bus bar 22 is fixedly attached (joined) to one end of the element 21 by soldering, and is electrically connected to the P-side metallicon electrode 21 a at one end of the element 21. The N-side bus bar 23 is fixedly attached (joined) to the other end of the element 21 by soldering, and is electrically connected to the N-side metallicon electrode 21 b at the other end of the element 21.

  The P-side bus bar 22 and the N-side bus bar 23 extend from the inside of the case member 24 to the outside of the case member 24. Each of the P-side bus bar 22 and the N-side bus bar 23, or the entire first portion 22 a, 23 a located inside the case member 24, is wrapped (covered) by the resin member 25. The P-side bus bar 22 and the N-side bus bar 23 are fixedly attached to the element 21 at the first portions 22a and 23a. The second portions 22b and 23b of the P-side bus bar 22 and the N-side bus bar 23 that are located outside the case member 24 are not encased (not covered) by the resin member 25 and are used for external connection. The terminal part.

  The case member 24 is made of metal, and is made of, for example, aluminum or iron that is cheaper than an epoxy resin. Since the case member 24 is made of metal, the case member 24 has a water vapor barrier property. The case member 24 may have a multi-part configuration, but it is desirable that the case member 24 has a single-part configuration to reduce the number of parts. The shape of the case member 24 is, for example, a cylindrical shape with a rectangular cross section (including a substantially rectangular shape with corners having an R shape).

  The resin member 25 is made of a resin material having a water vapor barrier property, and is made of, for example, an epoxy resin that is a thermosetting resin. The resin member 25 is filled in the case member 24, prevents water vapor from passing through the element 21 accommodated in the case member 24, and insulates the element 21 from the metal case member 24. doing.

  As shown in FIG. 1, the storage case 30 includes a case-side P-side bus bar 31, a case-side N-side bus bar 32, and a storage case body 33.

Case side P side bus bar 31 and case side N side bus bar 32 are each made of metal (for example, copper). The case-side P-side bus bar 31 and the case-side N-side bus bar 32 may each have a multi-part configuration or a single-component configuration.

Each of the case side P side bus bar 31 and the case side N side bus bar 32 includes a plurality of fitting portions 31a and 32a (four in the illustrated example). The fitting portion 31a of the case side P side bus bar 31 is fitted with the P side bus bar 22 of the unit capacitor 20 (unit capacitor 20 set in the housing case 30), and the fitting portion 32a of the case side N side bus bar 32 is fitted with The N-side bus bar 23 of the unit capacitor 20 (the unit capacitor 20 set in the housing case 30) is fitted. By fitting the P-side bus bar 22 of the unit capacitor 20 into the fitting portion 31a of the case-side P-side bus bar 31, and fitting the N-side bus bar 23 of the unit capacitor 20 into the fitting portion 32a of the case-side N-side bus bar 32, the unit capacitor 20 Is fixedly set (attached or assembled) to the housing case 30. By fitting the P-side bus bar 22 of the unit capacitor 20 into the fitting portion 31 a of the case-side P-side bus bar 31, the P-side bus bar 22 of the unit capacitor 20 and the case-side P-side bus bar 31 are electrically connected. Further, the N-side bus bar 23 of the unit capacitor 20 and the case-side N-side bus bar 32 are electrically connected by fitting the N-side bus bar 23 of the unit capacitor 20 into the fitting portion 32a of the case-side N-side bus bar 32. .

  The housing case body 33 is made of an insulating material, and is made of, for example, resin. The housing case body 33 fixes and supports the case side P side bus bar 31 and the case side N side bus bar 32 in a state where the case side P side bus bar 31 and the case side N side bus bar 32 are not in contact with each other. When the housing case body 33 is made of resin, for example, the housing case body 33 sets (inserts) the case-side P-side bus bar 31 and the case-side N-side bus bar 32 in an unillustrated mold for molding the housing case body 33. In this state, it is an insert-molded product that is molded by filling a cavity provided in the mold with molten resin and solidifying by cooling.

The storage case body 33 includes a fastening portion 33a for fastening and fixing the storage case 30 (capacitor 10) to a component to which the storage case 30 (capacitor 10) is attached. The component to which the housing case 30 is attached is, for example, a PCU (Power Control Unit) of an automobile. A metal collar (not shown) is fitted to the fastening portion 33a. The housing case 30 is fixedly attached to a component to which the housing case 30 is attached using a bolt (not shown) or the like.

The capacitor 10 according to the embodiment of the present invention is a unit in which a plurality of unit capacitors 20 having the same capacitance are prepared, and the number of the unit capacitors 20 is adjusted (set) in the housing case 30.
The number of unit capacitors 20 is such that the sum of the capacitances when the unit capacitors 20 are connected in parallel (synthetic capacitance) is within the range of the upper limit and lower limit required for the entire capacitor 10 ) To be adjusted. For example, when the capacitance of the unit capacitor 20 is 100 μF and the capacitance required for the entire capacitor 10 is 400 μF, the number of unit capacitors 20 is adjusted to four, and the capacitance of the unit capacitor 20 is 100 μF. When the capacitance required for the entire capacitor 10 is 500 μF, the number of unit capacitors 20 is adjusted to five.

Next, the operation and effect of the embodiment of the present invention will be described.
In the embodiment of the present invention, a plurality of unit capacitors 20 having the same capacitance including the element 21 and the P-side bus bar 22 and the N-side bus bar 23 fixed to the element 21 are prepared, and the number of the plurality of unit capacitors 20 is determined. In order to adjust and set in the storage case 30, it is possible to manufacture the capacitor 10 having a different capacitance for each vehicle type only by changing the number of unit capacitors 20 stored in the storage case 30 for each vehicle type. In this structure, since the configuration of the unit capacitor 20 can be shared, the cost of the capacitor 10 can be reduced as compared with the conventional case.

Since the unit capacitor 20 includes the metal case member 24, the case member 24 can suppress water vapor (moisture) around the case member 24 from entering the case member 24. Therefore, compared to the case where the unit capacitor 20 does not include the metal case member 24, the amount of resin material such as an epoxy resin for the water vapor barrier can be reduced, and the unit capacitor 20 can be downsized. At the same time, the cost can be reduced.

Since the case member 24 is made of metal, the heat generated in the element 21, the P-side bus bar 22, and the N-side bus bar 23 can be radiated to the outside of the case member 24, and the heat can be prevented from being accumulated in the unit capacitor 20.

The housing case 30 is a case in which the P-side bus bar 31 of the unit capacitor 20 set in the housing case 30 is fitted, and the N-side bus bar 23 of the unit capacitor 20 set in the housing case 30 is fitted. The side N-side bus bar 32, the P-side bus bar 22 of the unit capacitor 20 is fitted into the case-side P-side bus bar 31, and the N-side bus bar 23 of the unit capacitor 20 is fitted into the case-side N-side bus bar 32. The unit capacitor 20 can be set in the housing case 30 (the housing case 30 can be a so-called cassette type case). Therefore, an adhesive or a sealing material for setting the unit capacitor 20 in the housing case 30 is unnecessary, and compared with a case where an adhesive or a sealing material is required for setting the unit capacitor 20 in the housing case 30, The unit capacitor 20 can be easily set in the housing case 30 at a low cost.

10 Capacitor 20 Unit Capacitor 21 Element 21a P-side Metallicon Electrode 21b N-side Metallicon Electrode 22 P-side Bus Bar 23 N-side Bus Bar 24 Case Member 25 Resin Member 30 Housing Case 31 Case-side P-side Bus Bar 31a Case-side P-side Bus Bar Insertion Portion 32 Case-side N-side bus bar 32a Fit-in portion 33 of case-side N-side bus bar 32 Housing case body

Claims (4)

  A capacitor prepared by preparing a plurality of unit capacitors having the same electrostatic capacity including an element and a P-side bus bar and an N-side bus bar fixed to the element, and adjusting the number of the unit capacitors to be set in a storage case.   2. The capacitor according to claim 1, wherein the number of the plurality of unit capacitors is adjusted so that a total sum of capacitances when the unit capacitors are connected in parallel becomes a capacitance required for the entire capacitor.   The unit capacitor includes a metal case member in which the element is housed and the P-side bus bar and the N-side bus bar extend from the inside to the outside, and the inside of the case member is filled with the P-side bus bar. A resin member that wraps around the element, the P-side bus bar, and the N-side bus bar except for a portion located outside the case member and a portion of the N-side bus bar located outside the case member. Item 3. The capacitor according to item 1 or 2. The housing case includes a case-side P-side bus bar into which the P-side bus bar of the unit capacitor set in the housing case is fitted, and a case-side N side into which the N-side bus bar of the unit capacitor set into the housing case is fitted. The capacitor according to any one of claims 1 to 3, comprising a bus bar.

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