JP7050280B2 - Capacitor - Google Patents

Description

The present invention relates to a capacitor in which a capacitor element and an electrode plate are housed in a case and filled with resin.

Patent Document 1 describes that a part of positive and negative electrode plates is pulled out of the resin, the pulled out portions are overlapped with each other, and a cooling means such as a heat sink is brought into contact with one of the electrode plates. Has been done.

Japanese Unexamined Patent Publication No. 2016-119440

By the way, in the case of the above configuration, since the cooling means comes into contact with only one of the electrode plates, the other electrode plate cannot be directly cooled. Therefore, in Patent Document 1, a heat conductive sheet is interposed between one electrode plate and the other electrode plate, and the heat of the other electrode plate is transferred to the cooling means side. However, since heat is transferred via the heat transfer sheet and one electrode plate, it is difficult to cool the other electrode plate in the same manner as one electrode plate.

Therefore, an object of the present invention is to provide a capacitor capable of efficiently cooling both positive and negative electrode plates.

The capacitor of the present invention is a capacitor in which a capacitor element 2 and a pair of positive and negative electrode plates 3 (3A) and 4 (4A) are housed in a case 5 and filled with a resin 6, and the positive and negative electrode plates 3 (3A). 4 (4A) includes drawing portions 32 and 42 drawn out of the resin 6, respectively, and these drawing portions 32 and 42 overlap each other, and the drawing portion 32 of one electrode plate 3 is the other electrode plate 4. An abutting portion that abuts on the heat radiating member 7 (7A) is provided on the opposite side of (4A), and the abutting portion thereof includes a drawing portion 42 of the other electrode plate 4 (4A) and the radiating member 7 (7A). It is characterized in that an opening 32a1 and / or a notch 32a2 for abutting the is provided.

Further, it is preferable that the drawer portion 42 of the other electrode plate 4 is provided with a convex portion 42a1 that comes into contact with the heat radiating member 7 through the opening portion 32a1 and / or the notch portion 32a2.

The capacitor of the present invention is provided with an opening and / or a notch for abutting the drawer portion of the other electrode plate and the heat radiating member at the contact portion of one electrode plate that comes into contact with the heat radiating member. Therefore, the other electrode plate can be brought into contact with the heat radiation member, and both the positive and negative electrode plates can be efficiently cooled.

Further, if the pull-out portion of the other electrode plate is provided with a convex portion that comes into contact with the heat-dissipating member through the opening and / or the notch, the pull-out portion of the other electrode plate and the heat-dissipating member can be easily separated. Can be brought into contact.

It is an exploded perspective view which shows the capacitor which concerns on one Embodiment of this invention. It is also a perspective view of the capacitor. It is also an end view of the capacitor. It is an end view of the capacitor which concerns on a different embodiment of this invention. It is a perspective view which shows the electrode plate which provided the notch part.

Next, an embodiment of the capacitor of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the capacitor 1 of the present invention includes a plurality of capacitor elements 2, a pair of positive and negative electrode plates 3 and 4 for connecting the plurality of capacitor elements 2 in common, a capacitor element 2 and each electrode. It includes a case 5 that houses the plates 3 and 4, and a resin 6 that is filled in the case 5 and seals the capacitor element 2 and the electrode plates 3 and 4 (in FIGS. 1 and 2, the resin is used). omit). Hereinafter, each component will be described, but the concept of "upper and lower" in the description is at the time of manufacturing, more specifically at the time of resin filling, and does not necessarily define the upper and lower at the time of use.

The capacitor element 2 is, for example, a film capacitor obtained by winding a metallized film on which metal is vapor-deposited on the surface of an insulating film, and as shown in FIG. 1, metal is sprayed on both end surfaces in the axial direction. The electrode portions 2a and 2b are formed. This capacitor element 2 has a flat shape when viewed from the axial direction, specifically a substantially track shape (a shape in which two parallel lines and both ends thereof are connected by a semicircle), and a flat portion 2c and a curved surface are formed on the outer periphery in the axial direction. It has a part 2d. A plurality of the capacitor elements 2 are arranged so that the flat portions 2c and 2c face each other while the electrode portions 2a and 2b are oriented vertically to form a capacitor element group.

The pair of positive and negative electrode plates 3 and 4 are made of a conductive plate material (metal plate) such as a copper plate or an aluminum plate, and are arranged so as to sandwich the capacitor element 2 from above and below. Hereinafter, the electrode plate located on the upper side of the capacitor element 2 is referred to as a first electrode plate 3, and the electrode plate located on the lower side of the capacitor element 2 is referred to as a second electrode plate 4. Regarding the positive and negative electrodes, for example, the first electrode plate 3 is used as the negative electrode and the second electrode plate 4 is used as the positive electrode, but they may be replaced.

The first electrode plate 3 includes a substrate portion 31 facing the upper electrode portion 2a of the capacitor element 2, a drawer portion 32 drawn out of the case 5, and a connecting portion 33 connecting the substrate portion 31 and the drawer portion 32. ing.

The substrate portion 31 has a substantially rectangular shape in a plan view, and has a size sufficient to substantially cover the electrode portion 2a of each capacitor element 2. Further, the substrate portion 31 is provided with a tongue-shaped connection piece 31a for connecting to the electrode portion 2a at a position facing the electrode portion 2a of each capacitor element 2.

The drawer portion 32 has a substantially L-shape in side view, and includes a horizontal portion 32a and a vertical portion 32b extending upward from the edge of the horizontal portion 32a. The horizontal portion 32a has a substantially rectangular shape in a plan view, and includes two openings 32a1 arranged in the longitudinal direction. The vertical portion 32b is provided with an external connection portion 32b1 provided on the upper end side thereof for connection with an external device (not shown).

The connecting portion 33 rises from the long side of the substrate portion 31 and is connected to the long side of the horizontal portion 32a of the drawing portion 32 (the side opposite to the side on which the vertical portion 32b extends). The drawer portion 32 is pulled out of the resin 6 by the connecting portion 33.

As shown in FIG. 1, the second electrode plate 4 has a substrate portion 41 facing the lower electrode portion 2b of the capacitor element 2, a drawer portion 42 drawn out of the case 5, and a substrate portion 41 and a drawer portion 42. It is provided with a connecting portion 43 for connecting to and. The substrate portion 41 has substantially the same shape as the substrate portion 31 of the first electrode plate 3. Further, as for the connecting portion 43, since the second electrode plate 4 is located on the lower side of the capacitor element 2, it is only longer in the vertical direction by that amount. As for the vertical portion 42b of the drawer portion 42, the external connection portion 42b1 is simply arranged so as not to overlap with the external connection portion 32b1 of the first electrode plate 3 as a whole. Therefore, the same subscripts are added to these, and detailed explanations are omitted.

Regarding the horizontal portion 42a of the pull-out portion 42, a convex portion protruding toward the first electrode plate 3 side (upper in the figure) at a position corresponding to the opening portion 32a1 provided in the horizontal portion 32a of the first electrode plate 3. 42a1 is provided. The convex portion 42a1 has a size that is one size smaller than the opening 32a1 in a plan view.

The first electrode plate 3 and the second electrode plate 4 having the above configuration are manufactured by appropriately performing punching, bending, embossing, and cutting / bending on one metal plate. However, each part may be manufactured separately and integrated by welding or the like.

The case 5 includes an accommodating portion 51 for accommodating the capacitor element 2 and the electrode plates 3 and 4, and a guide portion 52 for guiding the horizontal portions 32a and 42a of the electrode plates 3 and 4. The accommodating portion 51 is composed of a case bottom portion 51a having a substantially rectangular shape in a plan view and a case side wall portion 51b erected from four sides of the case bottom portion 51a, respectively, and has a surface facing the case bottom portion 51a (upper surface side). ) Is provided with an opening 51c. The guide portion 52 extends in the horizontal direction from the upper end of one of the side wall portions 51b among the pair of side wall portions 51b constituting the side wall in the longitudinal direction. Such a case 5 is manufactured, for example, by integrally molding a synthetic resin. However, it may be manufactured by processing a metal plate. The resin 6 filled in the case 5 is, for example, an epoxy resin. However, the present invention is not limited to this, and various known resins such as urethane resin may be used.

Next, a method of manufacturing the capacitor 1 will be described. First, as described above, a plurality of capacitor elements 2 are arranged side by side to form a capacitor element group.

Next, the electrode plates 3 and 4 and the capacitor element 2 are connected. Specifically, the connection piece 31a of the substrate portion 31 of the first electrode plate 3 and the upper electrode portion 2a of the capacitor element 2 are connected by soldering or the like. Further, the connection piece 41a of the substrate portion 41 of the second electrode plate 4 and the lower electrode portion 2b of the capacitor element 2 are connected by soldering or the like. At this time, the drawer portions 32, 42 of the electrode plates 3 and 4 are located above the substrate portion 31 of the first electrode plate 3, and the drawer portions 32, 42 and the connecting portions 33, 43 are connected to each other. Are overlapped with each other through an insulating layer (gap).

When the drawers 32 and 42 overlap each other, the convex portion 42a1 of the second electrode plate 4 located on the lower side becomes dew through the opening 32a1 of the first electrode plate 3 located on the upper side thereof. The upper surface of the convex portion 42a1 and the upper surface of the horizontal portion 32a of the first electrode plate 3 are substantially flush with each other (see FIG. 3).

Then, the integrated capacitor element 2 and the electrode plate are housed in the housing portion 51 of the case 5. At this time, the substrate portion 31 of the first electrode plate 3 is accommodated so as to be located on the case opening 51c side, and the substrate portion 41 of the second electrode plate 4 is accommodated so as to be located on the case bottom portion 51a side. The drawer portions 32 and 42 are positioned on the guide portion 52 of the case 5 so that the horizontal portion 32a of the first electrode plate 3 is above the horizontal portion 42a of the second electrode plate 4. Then, the production of the capacitor 1 is completed by filling the accommodating portion 51 of the case 5 with the resin 6. The resin 6 embeds a part of the capacitor element 2, the substrate portions 31, 41 of each electrode plate, and the connecting portions 33, 43. On the other hand, the drawer portions 32 and 42 of the electrode plates 3 and 4 are located outside the resin 6.

In the capacitor 1 having the above configuration, since the drawing portions 32 and 42 are drawn out of the resin 6, as shown in FIG. 3, the outer surface of the drawing portion 32, specifically, the horizontal portion 32a of the first electrode plate 3 The heat radiating member 7 can be brought into contact with the upper surface of the above. That is, the horizontal portion 32a of the first electrode plate 3 can be used as a contact portion with which the heat radiation member 7 is brought into contact. Further, since the opening 32a1 is provided in the horizontal portion 32a of the first electrode plate 3, and the convex portion 42a1 is provided in the second electrode plate 4 at a position corresponding to the opening 32a1, the first electrode plate is provided. If the heat radiating member 7 is brought into contact with the upper surface of the horizontal portion 32a of 3, the heat radiating member 7 will naturally come into contact with the second electrode plate 4 through the opening 32a1 of the first electrode plate 3. Therefore, even when the case 5 is provided with the guide portion 52 and the horizontal portion 42a of the second electrode plate 4 does not face the outside, it is possible to efficiently cool both the electrode plates 3 and 4. .. As the heat radiating member 7, for example, a heat radiating sheet (heat radiating pad: having insulating properties) made of a highly heat-transmitting resin such as silicone resin or acrylic resin is assumed, but in addition to the heat radiating sheet, a heat sink is assumed. Or a combination with a cooler such as a pipe through which a refrigerant is passed may be used as the heat radiating member 7.

FIG. 4 shows a different capacitor 1A of the present invention. As shown in the figure, the capacitor 1A includes a heat dissipation member 7A as a component of the capacitor. The heat radiating member 7A is provided with a convex portion 7a at a position corresponding to the opening 32a1 of the horizontal portion 32a of the first electrode plate 3. Therefore, when the heat radiating member 7A is brought into contact with the horizontal portion 32a of the first electrode plate 3, the convex portion 7a of the heat radiating member 7A becomes the horizontal portion 42a1 of the second electrode plate 4A through the opening 32a1 of the first electrode plate 3. It is designed to come into contact. Even with such a configuration, the same effect as that of the capacitor 1 can be obtained. As a method of forming the convex portion 7a, in addition to increasing the thickness of the portion to be the convex portion 7a in advance, a flexible heat radiating member is pressed against the first electrode plate 3 to form a portion located at the opening 32a1. The convex portion 7a may be formed so as to protrude from the portion of.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, the opening 32a1 is provided in the first electrode plate 3, but as in the first electrode plate 3A shown in FIG. 5, a notch is provided in place of the opening 32a1 or together with the opening 32a1. A portion 32a2 may be provided. Even in this case, the same effect as that of the capacitor 1 can be obtained. Further, the horizontal portion 32a was used as the "contact portion" that abuts on the heat radiating member 7, but if the drawer portions 32 and 42 are where the electrode plates 3 and 4 overlap each other, the "hit portion" is used. It may be a "contact part". For example, the vertical portion 32b may be used as a “contact portion”, and the vertical portion 32b may be provided with an opening portion 32a1 or a notch portion 32a2.

Further, in the above embodiment, the opening 32a1 and the notch 32a2 are provided in the first electrode 3, but the opening and the notch may be provided in the second electrode plate 4. That is, the second electrode plate 4 may be provided with a "contact portion". The shapes of the openings 32a1, the notches 32a2, and the protrusions 42a1 and 7a are not particularly limited, and various shapes such as polygons and circles can be adopted according to the positions to be provided. In addition, the number can be changed as appropriate.

Further, in the above embodiment, the substrate portion 31 of the first electrode plate 3 is located on the case opening 51c side, and the substrate portion 41 of the second electrode plate 4 is located on the case bottom portion 51a side, but the positional relationship is limited. For example, the substrate portions 31 and 41 may be overlapped with each other and positioned on the case opening 51c side or the case bottom portion 51a side. Further, it may be arranged so as to face the case side wall portion 51b. Regarding the orientation of the capacitor element 2, the electrode portions 2a and 2b do not necessarily have to be oriented in the vertical direction, and may be oriented in the lateral direction (case side wall portion 51b side). The capacitor element 2 is not limited to a film capacitor, and various capacitor elements such as a ceramic capacitor may be used. As for the shape, various shapes such as a columnar shape and a prismatic shape can be adopted. Further, as the insulating layer between the electrode plates 3 and 4, insulating paper or the like may be used.

1, 1A Capacitor 2 Capacitor element 2a, 2b Electrode part 2c Flat part 2d Curved surface part 3, 3A First electrode plate 31 Board part 31a Connection piece 32 Draw out part 32a Horizontal part 32a1 Opening part 32a2 Notch part 32b Vertical part 32b1 External connection Part 33 Connecting part 4, 4A Second electrode plate 41 Board part 41a Connection piece 42 Pulling out part 42a Horizontal part 42a1 Convex part 42b Vertical part 42b1 External connecting part 43 Connecting part 5 Case 51 Accommodating part 51a Bottom part 51b Side wall part 51c Opening part 52 Guide part 6 Filling resin 7, 7A Heat dissipation member 7a Convex part

Claims (1)

A capacitor in which a capacitor element (2) and a pair of positive and negative electrode plates (3 (3A), 4 (4A)) are housed in a case (5) and filled with a resin (6).
The positive and negative electrode plates (3 (3A), 4 (4A)) each have a drawer portion (32, 42) drawn out of the resin (6), and these drawer portions (32, 42) overlap each other.
The drawer portion (32) of one electrode plate (3 (3A)) is provided with a contact portion that abuts on the heat dissipation member (7 (7A)) on the opposite side of the other electrode plate (4 (4A)). The contact portion is provided with an opening (32a1) for abutting the drawer portion (42) of the other electrode plate (4 (4A)) and the heat dissipation member (7 (7A)) .
A capacitor characterized in that a convex portion (42a1) that comes into contact with a heat radiating member (7) through an opening (32a1) is provided in a drawer portion (42) of the other electrode plate (4) .

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