JP2019216173A - Capacitor - Google Patents

Abstract

To provide a capacitor that is able to achieve efficient cooling while minimizing the number of components.SOLUTION: A capacitor comprises: a first module M1 comprising a first capacitor element 2, a first electrode plate 4 connected to one electrode part 2a of the first capacitor element 2, and a second electrode plate 5 connected to the other electrode part 2b of the first capacitor element 2; a second module M2 comprising a second capacitor element 3, a third electrode plate 6 connected to one electrode part 3a of a second capacitor element 3, and a fourth electrode plate 7 connected to the other electrode part 3b of the second capacitor element 3; and a heat transfer member 8. A third electrode plate 6 has an extended part 61c along the first module M1; the fourth electrode plate 7 has an overlap part 71b overlapping the extended part 61c of the third electrode plate 6 on an opposite side of the first module M1. The heat transfer member 8 has: a body part 81 along the extended part 61c of the third electrode plate 6 and/or the overlap part 71b of the fourth electrode plate 7; and an extended part 83 along the first electrode plate 4.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a capacitor having a heat transfer member.

  Patent Documents 1 to 3 disclose that a heat transfer member is brought into contact with or close to an electrode plate to remove heat from the electrode plate and the capacitor element. In particular, Patent Literature 2 describes that a heat transfer member (a heat conductive sheet) is interposed between the positive and negative electrode plates while reducing the inductance by stacking the positive and negative electrode plates on each other (a parallel plate structure). I have.

JP 2013-084787 A JP-A-2006-119440 JP 2017-017861 A

  By the way, a capacitor may be constituted by combining a plurality of modules each including one or more capacitor elements and a pair of positive and negative electrode plates respectively connected to the electrode portions of the capacitor elements. In such a capacitor, if a heat transfer member is to be interposed between the positive and negative electrode plates, as in Patent Document 2, for example, a heat transfer member is provided for each module, and assembly becomes complicated due to an increase in the number of parts. This will increase costs.

  Therefore, an object of the present invention is to provide a capacitor that can efficiently cool while suppressing the number of components.

  The capacitor 1 of the present invention is connected to the first capacitor element 2, the first electrode plate 4 connected to one electrode section 2 a of the first capacitor element 2, and the other electrode section 2 b of the first capacitor element 2. A first module M1 including a second electrode plate 5, a second capacitor element 3, a third electrode plate 6 connected to one electrode portion 3a of the second capacitor element 3, and a second capacitor element 3. A second module M2 comprising a fourth electrode plate 7 connected to the other electrode portion 3b and a heat transfer member 8 are provided, and the third electrode plate 6 has an extension 61c along the first module M1. , The fourth electrode plate 7 has an overlapping portion 71b overlapping the extension 61c of the third electrode plate 6 on the side opposite to the first module M1, and the heat transfer member 8 is provided with an extension 61c of the third electrode plate 6. And / or book along the overlapping portion 71b of the fourth electrode plate 7 And parts 81, and a extending portion 83 along the first electrode plate 4.

  It is preferable that the main body portion 81 of the heat transfer member 8 be located between the first module M1 and the extending portion 61c of the third electrode plate 6.

  In particular, it is preferable that the main body portion 81 of the heat transfer member 8 be located between the second electrode plate 5 and the extending portion 61c of the third electrode plate 6.

  In the capacitor of the present invention, the heat transfer member has a main body along the extension of the third electrode plate and / or the overlapped portion of the fourth electrode plate, and an extension along the first electrode plate. Therefore, two modules can be cooled by one heat transfer member, and cooling can be efficiently performed while suppressing the number of components.

  If the main body of the heat transfer member is located between the first module and the extension of the third electrode plate, cooling between the module that easily stores heat and the electrode plate can be achieved.

  When the main body of the heat transfer member is located between the second electrode plate and the extension of the third electrode plate, the cooling of the first, second, and third electrode plates is performed by one heat transfer member. Can be planned.

1 is an exploded perspective view showing a capacitor according to an embodiment of the present invention. It is a perspective view showing the state where each module and the heat transfer member were stored in the case. It is principal part sectional drawing of a capacitor. FIG. 4 is a cross-sectional view of a main part showing a state where the capacitor is attached to a housing of an external device. It is a principal part sectional view showing a capacitor of a different embodiment. It is principal part sectional drawing which shows the capacitor used as a comparison object of a cooling effect.

  Next, an embodiment of the capacitor 1 of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a capacitor 1 of the present invention includes a first capacitor element 2, a first electrode plate 4 connected to one electrode 2 a of the first capacitor element 2, and the other of the first capacitor element 2. A first module M1 including a second electrode plate 5 connected to the electrode portion 2b of the second capacitor element 3, a second capacitor element 3, and a third electrode plate 6 connected to one electrode section 3a of the second capacitor element 3. , A second module M2 including a fourth electrode plate 7 connected to the other electrode portion 3b of the second capacitor element 3, and a heat transfer member 8. In addition, a case 9 that accommodates the first and second modules M1 and M2 and a resin R (see FIG. 3) filled in the case 9 and covering at least the first and second capacitor elements 2 and 3 are provided. . Hereinafter, each of the above components will be described, but the concept of “up and down” in the description is at the time of manufacturing, more specifically, at the time of filling the resin, and does not necessarily define the up and down at the time of use. .

  The first capacitor element 2 is a film capacitor formed by winding a metallized film obtained by vapor-depositing a metal on the surface of an insulating film. As shown in FIG. Are formed, respectively. The 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 on the outer periphery in the axial direction. 2d.

  The first capacitor element 2 having the above configuration constitutes a first capacitor element group by arranging four such that the flat portions 2c and 2c face each other with the electrode portions 2a and 2b facing up and down. ing. Note that the number of the first capacitor elements 2 in the first capacitor element group can be appropriately changed according to the required capacitance.

  The second capacitor element 3 has the same configuration as the first capacitor element 2. The second capacitor element group has the same configuration as the first capacitor element group. Therefore, the same suffix is attached and detailed description is omitted. It is not necessary to match the number of capacitor elements 2 and 3 between the first capacitor element group and the second capacitor element group.

  The first electrode plate 4 is connected to the lower electrode portion 2a of the first capacitor element 2, as shown in FIG. The first electrode plate 4 includes a main body portion 41 extending along the outer surface of the first capacitor element 2, an external connection portion 42 extending upward from an upper end of the main body portion 41, and an end of the main body portion 41 on the electrode portion 2 a side. And an element connection piece 43 extending from the portion. The main body 41 is roughly divided into a horizontal portion 41a along the lower electrode portion 2a of the first capacitor element 2 and a vertical portion 41b rising from one end of the horizontal portion 41a and extending along the curved surface portion 2d. It is substantially L-shaped when viewed from the side.

  The second electrode plate 5 is connected to the upper electrode portion 2b of the first capacitor element 2. The second electrode plate 5 includes a main body 51 extending along the upper electrode 2 b of the first capacitor element 2, an external connection part 52 extending upward from an end of the main body 51, and an external part of the main body 51. An element connecting piece 53 extends from an end opposite to the side where the connecting portion 52 extends. The external connection portion 52 of the second electrode plate 5 is provided so as to be shifted so as not to overlap with the external connection portion 42 of the first electrode plate 4.

  The third electrode plate 6 is connected to the lower electrode portion 3a of the second capacitor element 3. The third electrode plate 6 includes a main body 61 partially extending along the outer surface of the second capacitor element 3, an external connection portion 62 extending upward from an end of the main body 61, and an electrode of the main body 61. And an element connecting piece 63 extending from the end on the part 3a side. The main body 61 includes a horizontal portion 61a along the lower electrode portion 3a of the second capacitor element 3, a vertical portion 61b rising from one end of the horizontal portion 61a, and a vertical portion 61b along the curved surface portion 3d, and a horizontal direction from an upper end of the vertical portion 61b. And is generally Z-shaped when viewed from the side as a whole.

  The fourth electrode plate 7 is connected to the upper electrode portion 3b of the second capacitor element 3. The fourth electrode plate 7 includes a main body 71 partially extending along the upper electrode portion 3 b of the second capacitor element 3, an external connection portion 72 extending upward from an end of the main body 71, An element connection piece 73 extends from an end opposite to the side from which the external connection portion 72 of the extension 71 extends. The main body 71 is roughly divided into a horizontal portion 71a along the upper electrode portion 3b of the second capacitor element 3 and an overlapping portion 71b overlapping with the extension portion 61c of the third electrode plate 6. In addition, a step 71c is provided between the horizontal portion 71a and the overlapping portion 71b to slightly lift the overlapping portion 71b more than the horizontal portion 71a. The external connection part 72 of the fourth electrode plate 7 is provided so as not to overlap with the external connection part 62 of the third electrode plate 6.

  Each of the electrode plates 4, 5, 6, and 7 is formed by appropriately punching or bending a metal plate such as aluminum or copper.

  The heat transfer member 8 includes a main body 81 having a substantially rectangular shape in a plan view, a connecting portion 82 extending from an end of the main body 81, and extending downward from the end where the connecting portion 82 extends. And the extended portion 83 provided. The connecting portion 82 extends from the vicinity of the corner of the main body portion 81, and a mounting hole 82a is formed near the front end. The extending portion 83 extends from between the two connecting portions 82 and 82. In order to avoid contact with the external connection portions 42 and 52 of the first and second electrode plates 4 and 5, the extension portion 83 is provided with a notch 83a at a position where the external connection portions 42 and 52 are located. . In this state, it can be said that the extending portion 83 is divided into two. The heat transfer member 8 is formed by appropriately punching or bending a metal plate such as aluminum or copper. However, it is not necessary to provide conductivity, and it is possible to manufacture with a material having high thermal conductivity.

  The case 9 includes a bottom portion 91 having a substantially rectangular shape in a plan view, and side wall portions 92 rising from four sides of the bottom portion 91. An opening 93 is provided on the upper surface, and an accommodation space capable of accommodating the first and second capacitor elements 2 and 3 is provided inside. One of the four side wall portions 92 is provided with a mounting portion 94 for connecting to the connection portion 82 of the heat transfer member 8. The mounting portion 94 is also used when mounting the capacitor 1 to a housing C such as an inverter, which is an external device, and has a mounting hole 94a.

  The resin R filled in the case 9 is, for example, an epoxy resin. However, the invention is not limited thereto, and various known resins such as urethane resins can be used.

  Next, a method for manufacturing the capacitor 1 will be described. First, the first and second electrode plates 4 and 5 are connected to the first capacitor element 2 to form a first module M1, and the third and fourth electrode plates 6 and 7 to form a second module M2. Specifically, the lower electrode part 2a of the first capacitor element 2 is connected to the element connection piece 43 of the first electrode plate 4, and the upper electrode part 2b of the first capacitor element 2 and the second electrode The element connection piece 53 of the plate 5 is connected. The lower electrode portion 3a of the second capacitor element 3 is connected to the element connection piece 63 of the third electrode plate 6, and the upper electrode portion 3b of the second capacitor element 3 and the fourth electrode plate 7 are connected. The element connection piece 73 is connected. At this time, the external connection portions 42, 52, 62, 72 of the respective electrode plates 4, 5, 6, 7 are aligned on the same side. In this state, the extending portion 61c of the third electrode plate 6 and the overlapping portion 71b of the fourth electrode plate 7 overlap each other while ensuring insulation.

  Next, the heat transfer member 8 is interposed between the first module M1 and the second module M2. Specifically, first, the main body 81 of the heat transfer member 8 is superimposed on the upper electrode 2 b of the first capacitor element 2 and the main body 51 of the second electrode plate 5 while ensuring insulation. At this time, the external connection portions 42, 52 of the first and second electrode plates 4, 5 are positioned in the notches 83a provided in the extension portion 83 of the heat transfer member 8, and the extension portion 83 is connected to the first electrode. Along the vertical portion 41b of the plate 4 (overlap with securing insulation). Subsequently, the extending portion 61c of the third electrode plate 6 is arranged on the main body portion 81 of the heat transfer member 8 (overlapping after securing the insulation). As a result, the first capacitor element 2 and the second capacitor element 3 are arranged in the horizontal direction with the curved surfaces 2d, 3d facing each other, and the extension 61c of the third electrode plate 6 is connected to the first module M1. Along the upper surface of. Further, the main body 81 of the heat transfer member 8 is located between the first module M1 (more specifically, the main body 51 of the second electrode plate 5) and the extension 61c of the third electrode plate 6. Become.

  The first and second modules M1 and M2 thus integrated and the heat transfer member 8 are housed in a case 9 as shown in FIG. At this time, the position of the connection part 82 of the heat transfer member 8 and the position of the attachment part 94 of the case 9 are aligned. The external connection portions 42, 52, 62, 72 of the respective electrode plates 4, 5, 6, 7 are accommodated so as to protrude from the case opening 93 to the outside. Then, the case 9 is filled with the resin R, and resin molding is performed except for the external connection portions 42, 52, 62, 72 and the connection portion 82. Thus, the manufacture of the capacitor 1 is completed.

  The capacitor 1 having the above-described configuration is used, for example, as shown in FIG. The attachment is performed, for example, by inserting bolts into attachment holes 82a, 94a between the connection portion 82 of the heat transfer member 8 and the attachment portion 94 of the case 9, and screwing the bolts to the housing C. As a result, the connection portion 82 of the heat transfer member 8 directly contacts the case C, and heat from each of the modules M1 and M2 is transmitted to the case C via the heat transfer member 8. Since the casing C of the external device usually has a large heat capacity and is cooled if the external device generates heat like an inverter, the capacitor 1 can be efficiently cooled. In particular, the heat transfer member 8 is located between the main body portion 51 of the second electrode plate 5 and the extending portion 61c of the third electrode plate 6, and is closely opposed to the vertical portion 41b of the first electrode plate 4. Therefore, efficient cooling is possible. Although the fourth electrode plate 7 does not directly face the heat transfer member 8, it is located closest to the case opening 93, so the distance from the case C is short, and the cooling effect from the case C is small. Can be obtained.

  More specifically, in the case of the condenser 11 (see FIG. 6) in which the heat transfer member 8 is arranged closest to the case opening 93 and the extension portion 83 is not provided, the heat generation temperature when power is turned on is maximum. Although the temperature was 99.3 ° C., the capacitor 1 of the present embodiment could further reduce the temperature by a maximum of 97.7 ° C., or 1.6 ° C. It should be noted that this reduction width (difference) may be more remarkable when the difference between the temperature around the capacitor 1 and the temperature of the housing C is large, or by increasing the number of connection portions 82 of the heat transfer member 8. Become.

  Further, in the capacitor 1 of the present invention, since the third electrode plate 6 and the fourth electrode plate 7 overlap each other, it also contributes to lower inductance.

  FIG. 5 is a sectional view showing another embodiment of the capacitor of the present invention. As shown in the figure, the main body 81 of the heat transfer member 8 may be along the overlapping portion 71b of the fourth electrode plate 7. Even in this case, the first, second, and fourth electrode plates 4, 5, and 7 can be efficiently cooled. Further, the extending portion 61c of the third electrode plate 6, the overlapping portion 71b of the fourth electrode plate 7, and the main body 81 of the heat transfer member 8 may be arranged on the bottom 91 side or the side wall 92 side of the case 9.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and can be variously modified and implemented within the scope of the present invention. For example, the first and second capacitor elements 2 and 3 are not limited to film capacitors, and various capacitor elements such as ceramic capacitors may be used. Regarding the shape of the capacitor element, various shapes such as a columnar shape and a prismatic shape can be adopted. Further, although the axial directions of the first and second capacitor elements 2 and 3 are vertically oriented, they may be horizontally oriented.

  The number of the connection portions 82 of the heat transfer member 8 can be changed as appropriate. However, since the cooling effect can be obtained as the contact area with the casing C is larger, it is preferable to increase the number or the area per one. In the above embodiment, the insulation between the electrode plates 4, 5, 6, 7 and between the electrode plates 4, 5, 6, 7 and the heat transfer member 8 are ensured by providing an interval capable of ensuring the insulation. Alternatively, an insulator such as insulating paper may be interposed.

DESCRIPTION OF SYMBOLS 1 Capacitor 2 1st capacitor element 2a One electrode part 2b The other electrode part 2c Flat part 2d Curved surface part 3 Second capacitor element 3a One electrode part 3b The other electrode part 3c Flat part 3d Curved surface part 4 1st electrode plate 41 Main part 41a Horizontal part 41b Vertical part 42 External connection part 43 Element connection piece 5 Second electrode plate 51 Main part 52 External connection part 53 Element connection piece 6 Third electrode plate 61 Main part 61a Horizontal part 61b Vertical part 61c Extension part 62 External connection part 63 Element connection piece 7 Fourth electrode plate 71 Main part 71a Horizontal part 71b Overlapping part 71c Step 72 External connection part 73 Element connection piece 8 Heat transfer member 81 Main part 82 Connection part 82a Mounting hole 83 Extension part 83a Notch 9 Case 91 Bottom part 92 Side wall part 93 Opening 94 Mounting part 94a Mounting hole R Resin M1 First module M2 Second module C External device housing

Claims (3)

A first module including a first capacitor element, a first electrode plate connected to one electrode of the first capacitor element, and a second electrode plate connected to the other electrode of the first capacitor element;
A second module including a second capacitor element, a third electrode plate connected to one electrode of the second capacitor element, and a fourth electrode plate connected to the other electrode of the second capacitor element;
And a heat transfer member,
A third electrode plate having an extension along the first module;
A fourth electrode plate having an overlapping portion overlapping the extension of the third electrode plate on the opposite side of the first module;
The heat transfer member has a main body along the extending portion of the third electrode plate and / or the overlapping portion of the fourth electrode plate, and an extending portion along the first electrode plate.
Capacitors. A main body of the heat transfer member is located between the first module and the extension of the third electrode plate;
The capacitor according to claim 1. The main body of the heat transfer member is located between the second electrode plate and the extension of the third electrode plate.
The capacitor according to claim 2.

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