WO2018051656A1

WO2018051656A1 - Capacitor

Info

Publication number: WO2018051656A1
Application number: PCT/JP2017/027425
Authority: WO
Inventors: 拓也稲積; 太陽塚原
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-09-15
Filing date: 2017-07-28
Publication date: 2018-03-22
Also published as: JPWO2018051656A1

Abstract

A capacitor is provided with a capacitor element unit comprising a capacitor element with an electrode to which a planar bus bar is connected, a case in which the capacitor element unit is contained, and a filler resin filling the case. The capacitor is characterized in that the bus bar extends to an opening of the case with a surface of the bus bar being in proximity and opposed to an inner side wall of the case, and the bus bar is led via the opening and out of the case, wherein the case includes a first protective wall portion which is provided extending from an opening end portion of the case, is opposed to the surface of a led-out portion of the bus bar leading out of the case, and is wider than the width of the surface of the led-out portion.

Description

Capacitor

The present invention relates to a capacitor.

An electric element such as a capacitor element is housed in a case, and a resin such as an epoxy resin is filled in the case, and a terminal connected to the electric element is provided, and the tip of the terminal connected to the outside is located outside the case. A derived resin-encapsulated electrical component is described in Patent Document 1.

In the resin-encapsulated electrical component of Patent Document 1, the terminal is connected to the electric element at the base end, and the terminal base extending from the base end is in close proximity to the inner wall of the case toward the opening side of the case. Extending from the case to the tip.

JP 2010-056120 A

In the above resin-encapsulated electrical component, there is a concern that the resin filled in the case creeps up the gap between the terminal base of the terminal and the inner side wall of the case and leaks out of the case due to a capillary phenomenon.

In view of such a problem, an object of the present invention is to provide a capacitor capable of preventing leakage of filled resin from a case.

A capacitor according to a main aspect of the present invention includes a capacitor element unit in which a plate-like bus bar is connected to an electrode of a capacitor element, a case in which the capacitor element unit is accommodated, and a filling resin filled in the case And comprising. Here, the bus bar extends toward the opening side of the case so that its surface is close to and opposed to the inner wall of the case, and is led out of the case from the opening. Furthermore, a first barrier portion that faces the surface of the lead-out portion of the bus bar led out from the case and is wider than the width of the surface of the lead-out portion extends from the opening end of the case.

According to the present invention, it is possible to provide a capacitor that can prevent leakage of the filled resin from the case.

The effect or significance of the present invention will become more apparent from the following description of embodiments. However, the embodiment described below is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

1A and 1B are a front view and a left side view, respectively, of a film capacitor according to an embodiment. 2A is a front sectional view of the film capacitor according to the embodiment, and FIG. 2B is a perspective sectional view of the right end portion of the film capacitor according to the embodiment. 3A is a left side cross-sectional view of the film capacitor in which the filling resin and the capacitor element are omitted according to the embodiment, and FIG. 3B is a filling resin and capacitor element according to the embodiment. FIG. 6 is a left side cross-sectional view of the film capacitor with the upper bus bar omitted.

Hereinafter, a film capacitor 1 which is an embodiment of the capacitor of the present invention will be described with reference to the drawings. For convenience, front and rear, left and right, and up and down directions are appropriately appended to each drawing. In addition, the direction of illustration shows the relative direction of the film capacitor 1 to the last, and does not show an absolute direction.

In the present embodiment, the film capacitor 1 corresponds to a “capacitor” described in the claims. The front side surface 21 and the rear side surface 22 correspond to the “first side surface” recited in the claims. Furthermore, the upper end face electrode 111 and the lower end face electrode 112 correspond to “electrodes” recited in the claims. Furthermore, the upper bus bar 200 and the lower bus bar 300 correspond to the “bus bar” described in the claims. Furthermore, the upper overlapping portion 220 and the lower overlapping portion 330 correspond to the “lead-out portion” recited in the claims.

However, the above description is only for the purpose of associating the configuration of the claims with the configuration of the embodiment, and the invention described in the claims is incorporated into the configuration of the embodiment by the above association. It is not limited at all.

FIGS. 1A and 1B are a front view and a left side view of a film capacitor 1 according to the present embodiment, respectively. FIG. 2A is a front sectional view of the film capacitor 1 according to the present embodiment, and FIG. 2B is a perspective sectional view of the right end portion of the film capacitor 1 according to the present embodiment. . 3A is a left side cross-sectional view of the film capacitor 1 in which the filling resin 30 and the capacitor element 100 are omitted according to the present embodiment, and FIG. 3B is a diagram according to the present embodiment. 3 is a left side sectional view of the film capacitor 1 in which the filling resin 30, the capacitor element 100, and the upper bus bar 200 are omitted. FIG.

The film capacitor 1 includes a capacitor element unit 10, a case 20, and a filling resin 30. Case 20 accommodates capacitor element unit 10. The filling resin 30 is made of a thermosetting resin, filled in the case 20 in a molten state, and cured when the case 20 is heated. The filling resin 30 covers the main part of the capacitor element unit 10 and protects them from moisture and impact.

Capacitor element unit 10 includes a plurality of (for example, three) capacitor elements 100, and plate-like upper bus bar 200 and lower bus bar 300 are connected to

end face electrodes

111 and 112 on both sides of each capacitor element 100, respectively. It is constituted by.

The capacitor element 100 is formed by stacking two metallized films obtained by vapor-depositing aluminum on a dielectric film, winding or laminating the stacked metallized films, and pressing them flatly. In the capacitor element 100, an upper end face electrode 111 is formed on the upper end face by blowing metal such as zinc, and a lower end face electrode 112 is also formed on the lower end face by blowing metal such as zinc. The The capacitor element unit 10 is accommodated in the case 20 with a plurality of capacitor elements 100 arranged in the left-right direction and the both end surfaces of each capacitor element 100 facing in the up-down direction.

The capacitor element 100 of the present embodiment is formed of a metallized film in which aluminum is vapor-deposited on a dielectric film, but in addition to this, metallization in which other metals such as zinc and magnesium are vapor-deposited. It may be formed by a film. Or the capacitor | condenser element 100 may be formed with the metallized film which vapor-deposited several metals among these metals, and may be formed with the metallized film vapor-deposited the alloy of these metals. .

The upper bus bar 200 is formed of a conductive material, for example, a copper plate, and includes an upper electrode terminal portion 210, an upper overlapping portion 220, and an upper connection terminal portion 230. The upper bus bar 200 is formed by, for example, appropriately cutting and bending a single copper plate, and the upper electrode terminal portion 210, the upper overlapping portion 220, and the upper connection terminal portion 230 are integrated.

The upper electrode terminal portion 210 has a plate shape that is long on the left and right sides, covers the upper end surface electrode 111 of the capacitor element 100, and is electrically connected to the upper end surface electrode 111 by a connection method such as soldering or welding.

The upper overlapping portion 220 has a long plate shape in the front and rear direction, and extends upward from the right end portion of the upper electrode terminal portion 210. The width before and after the upper overlapping portion 220 is slightly larger than the width before and after the upper electrode terminal portion 210, and the rear portion of the upper overlapping portion 220 projects rearward from the upper electrode terminal portion 210.

The upper connection terminal portion 230 has a plate shape that is long in the vertical direction, and extends upward from the upper end portion on the rear side of the upper overlapping portion 220. The upper connection terminal portion 230 is formed with a circular attachment hole 231 penetrating the front and back at the tip portion. An external terminal (not shown) is connected to the upper connection terminal portion 230 by screwing using the mounting hole 231.

The lower bus bar 300 is formed of a conductive material, for example, a copper plate, and includes a lower electrode terminal portion 310, a relay portion 320, a lower overlapping portion 330, and a lower connection terminal portion 340. The lower bus bar 300 is formed by, for example, appropriately cutting and bending a single copper plate, and the lower electrode terminal portion 310, the relay portion 320, the lower overlapping portion 330, and the lower connection terminal portion 340 are formed. It is united.

The lower electrode terminal portion 310 has a long plate shape on the left and right sides, covers the lower end electrode 112 of the capacitor element 100, and is electrically connected to the lower end electrode 112 by a connection method such as soldering or welding. .

The relay unit 320 relays between the lower electrode terminal unit 310 and the lower polymerization unit 330. The relay portion 320 has a plate shape that is long in the vertical direction, and extends upward along the outer peripheral surface 113 of the capacitor element 100 from the right end portion of the lower electrode terminal portion 310. In order to prevent the lower overlapping portion 330 and the upper overlapping portion 220 from being buffered, the relay portion 320 is once bent rightward at an intermediate portion, and further extends upward. The relay part 320 is formed with a substantially oval circulation port part 321 for circulating the filling resin 30.

The lower overlapping portion 330 has a long plate shape in the front and rear direction, and extends upward from the upper end portion of the relay portion 320. The front and rear widths of the lower overlapping portion 330 are slightly larger than the front and rear widths of the lower electrode terminal portion 310 and the relay portion 320, and the front portion of the lower overlapping portion 330 is larger than the lower electrode terminal portion 310 and the relay portion 320. Project forward. In the lower overlapping portion 330, two circular flow port portions 331 are formed so as to be arranged in the front-rear direction. The filling resin 30 circulates through these circulation ports 331.

The lower connection terminal portion 340 has a plate shape that is long in the vertical direction, and extends upward from the upper end portion on the front side of the lower overlapping portion 330. The lower connection terminal portion 340 is formed with a circular attachment hole 341 penetrating the front and back at the tip portion. An external terminal (not shown) is connected to the lower connection terminal portion 340 by screwing using the mounting hole 341.

In the capacitor element unit 10, the upper overlapping portion 220 of the upper bus bar 200 and the lower overlapping portion 330 of the lower bus bar 300 overlap on the left and right. As a result, the distance between the upper overlapping portion 220 and the lower overlapping portion 330 can be reduced, and the ESL (equivalent DC inductance) of the upper bus bar 200 and the lower bus bar 300 can be effectively reduced.

An insulating plate made of insulating paper or resin (not shown) is interposed between the upper overlapping portion 220 and the lower overlapping portion 330, thereby ensuring insulation between the two. Further, the upper overlapping portion 220 and the upper connecting terminal portion 230 protrude rearward from the upper electrode terminal portion 210 (capacitor element 100), and the lower overlapping portion 330 and the lower connecting terminal portion 340 include the lower electrode terminal portion 310. And it protrudes ahead of the relay part 320 (capacitor element 100). Thereby, the upper side connection terminal part 230 and the lower side connection terminal part 340 can be separated in the front-back direction, and the insulation distance of the front-back direction of both can be ensured (refer FIG. 3 (a), (b)).

The case 20 is formed of, for example, a resin such as polyphenylene sulfide (PPS) in a substantially rectangular parallelepiped box shape that is long in the left-right direction, which is the arrangement direction of the capacitor elements 100, and has an opening 20a on the upper surface thereof. The front side surface 21 and the rear side surface 22 of the case 20 are along the direction in which the capacitor elements 100 are arranged. Further, the left side surface 23 and the right side surface 24 of the case 20 are along a direction orthogonal to the arrangement direction of the capacitor elements 100, and the width thereof is narrower than the widths of the front side surface 21 and the rear side surface 22.

The front side surface 21 of the case 20 has a front side bulging portion 21 a that bulges forward so as to correspond to the forward protrusion of the lower overlapping portion 330. Further, the rear side surface 22 of the case 20 has a rear side bulging portion 22 a that bulges rearward so as to correspond to the rearward extension of the upper overlapping portion 220. Further, the right side surface 24 of the case 20 has an upper width wider than the lower width by the front bulging portion 21a and the rear bulging portion 22a.

The lower overlapping portion 330 of the lower bus bar 300 extends toward the opening 20a so that the surface 330a thereof is closely opposed to the inner wall of the right side surface 24 of the case 20, and is led out of the case 20 from the opening 20a. The In the lower overlapping portion 330, the front side end surface 330b is in close proximity to the front side surface 21, that is, the inner wall of the front bulged portion 21a. The gap between the surface 330a of the lower overlapping portion 330 and the inner wall of the right side surface 24 is, for example, about 1 mm, and the gap between the side end surface 330b of the lower overlapping portion 330 and the inner wall of the front bulged portion 21a is For example, it is about 2 mm. Since the gap is small as described above, when the molten filling resin 30 is filled in the case 20, the gap between the surface 330a of the lower polymerization portion 330 and the inner wall of the right side surface 24 and the The filling resin 30 tends to crawl up through the gap between the side end surface 330b of the side overlapping portion 330 and the inner side wall of the front bulge portion 21a (see FIG. 2A).

Similarly, the upper overlapping portion 220 of the upper bus bar 200 extends toward the opening 20a so that the portion that does not overlap the lower overlapping portion 330 of the surface 220a is close to the inner wall of the right side surface 24 of the case 20, It is led out of the case 20 from the opening 20a. In the upper overlapping portion 220, the rear side end surface 220b is in close proximity to the rear side surface 22, that is, the inner wall of the rear side bulging portion 22a. The clearance between the surface 220a of the upper overlapping portion 220 and the inner wall of the right side surface 24 is, for example, about 2 mm, and the clearance between the side end surface 220b of the upper overlapping portion 220 and the inner wall of the rear bulging portion 22a is, for example, 2 mm or so. Since the gap is small as described above, when the molten filling resin 30 is filled in the case 20, the gap between the surface 220a of the upper overlapping portion 220 and the inner wall of the right side surface 24 and the upper polymerization are caused by capillary action. The filling resin 30 tends to creep up through the gap between the side end surface 220b of the portion 220 and the inner wall of the front bulge portion 21a.

Therefore, the first barrier 25 extends from the upper end of the right side 24 of the case 20, that is, from the open end 20 b on the right side 24, over the entire range of the right side 24. The first barrier 25 is made wider than the total width of the surface 330 a of the lower overlapping portion 330 and the width of the portion not overlapping the lower overlapping portion 330 of the surface 220 a of the upper overlapping portion 220. Further, the upper end portion of the front bulge portion 21a of the case 20, that is, the opening end portion 20b on the front bulge portion 21a side, and the upper end portion of the rear bulge portion 22a, that is, the opening on the rear bulge portion 22a side. The

second barrier portions

26 and 27 are extended from the end portion 20b so as to be connected to both ends of the first barrier portion 25. The front second barrier 26 is wider than the side end surface 330 b of the lower overlapping portion 330, and the rear second barrier 27 is wider than the side end 220 b of the upper overlapping portion 220. The first barrier 25 and the

second barriers

26 and 27 are set higher than the top end of the filling resin 30 when the filling resin 30 scoops up the gap.

The film capacitor 1 can be attached to an attachment case 2 made of a metal such as aluminum when mounted on a vehicle or the like. In this case, there may occur a case where the mounting case 2 is close to the case 20 as indicated by a one-dot chain line in FIG. In such a case, it is desirable that the first barrier portion 25 and the

second barrier portions

26 and 27 are made higher than the mounting case 2. In this way, insulation between the upper bus bar 200 and the lower bus bar 300 and the mounting case 2 is ensured.

<Effect of Embodiment>
As described above, according to the present embodiment, the following effects are exhibited.

The filling resin 30 crawls the gap between the surface 330a of the lower overlapping portion 330 of the lower bus bar 300 and the inner wall of the right side 24 and the gap between the surface 220a of the upper overlapping portion 220 of the upper bus bar 200 and the inner wall of the right side 24. Even if it happens to rise, the first barrier portion 25 extending from the opening end portion 20b on the right side surface 24 side of the case 20 prevents the filled resin 30 that has risen from leaking from the case 20. can do.

Further, the gap between the side end surface 330b of the lower overlapping portion 330 of the lower bus bar 300 and the inner wall of the front side surface 21 (front bulging portion 21a), the side end surface 220b and the rear side surface 22 of the upper overlapping portion 220 of the upper bus bar 200 ( Even if the filling resin 30 crawls up through the gap between the rear side bulging portion 22a) and the inner side wall, the second barrier portion 26 extended from the opening end portion 20b on the front side surface 21 side of the case 20 is provided. And the second barrier wall portion 27 extending from the opening end portion 20b on the rear side surface 22 side, it is possible to prevent the filled resin 30 that has been scooped up from leaking from the case 20.

In particular, the lower overlapping portion 330 of the lower bus bar 300 and the upper overlapping portion 220 of the upper bus bar 200 are narrow side surfaces along the direction orthogonal to the arrangement direction of the capacitor elements 100 in the case 20 (in this embodiment, the right side When disposed in the vicinity of the surface 24), the side end surface 330b of the lower overlapping portion 330 and the side end surface 220b of the upper overlapping portion 220 are side surfaces along the alignment direction of the capacitor elements 100 (in this embodiment, the front side surface 21). And it becomes easy to approach the inner wall of the rear side surface 22). Therefore, in the present embodiment, even if such an arrangement configuration of the upper bus bar 200 and the lower bus bar 300 is adopted in the case 20, the filling from the case 20 is achieved by providing the

second barrier portions

26 and 27. Leakage of the resin 30 can be accurately prevented.

The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and the application example of the present invention can be modified in various ways in addition to the above embodiment. Is possible.

<Example of change>
In the embodiment described above, a configuration in which the upper overlapping portion 220 of the upper bus bar 200 and the lower overlapping portion 330 of the lower bus bar 300 are disposed in the vicinity of the right side surface 24 of the case 20 is adopted. However, a configuration in which the upper overlapping portion 220 and the lower overlapping portion 330 are disposed in the vicinity of the left side surface 23 of the case 20 may be employed. In this case, the first barrier 25 extends from the open end 20 b on the left side 23 of the case 20, and the

second barriers

26, 27 are connected to both ends of the first barrier 25 so as to be connected to both ends. It extends from the open end 20b on the 21 side and the rear side 22 side.

Further, a configuration in which the upper overlapping portion 220 and the lower overlapping portion 330 are disposed in the vicinity of the front side surface 21 or the rear side surface 22 of the case 20 may be adopted. In this case, the first barrier 25 is extended from the opening end 20b on the front side 21 side or the rear side 22 side. At this time, if the side end surface 220b of the upper overlapping portion 220 and the side end surface 330b of the lower overlapping portion 330 are in close proximity to the inner wall of the left side surface 23 or right side surface 24 of the case 20, the left side surface 23 side or right side The

second barrier portions

26 and 27 may be extended from the open end 20b on the surface 24 side.

Furthermore, the number of capacitor elements 100 included in the capacitor element unit 10 may not be plural as in the above embodiment, but may be one.

Furthermore, in the above embodiment, the capacitor element 100 is formed by stacking two metallized films obtained by vapor-depositing aluminum on a dielectric film and winding or laminating the stacked metallized films. Alternatively, the capacitor element 100 may be formed by stacking a metallized film in which aluminum is vapor-deposited on both sides of the dielectric film and an insulating film, and winding or laminating them.

Furthermore, in the said embodiment, the film capacitor 1 was mentioned as an example of the capacitor | condenser of this invention. However, the present invention can also be applied to capacitors other than the film capacitor 1.

In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

In the description of the above embodiment, the terms indicating directions such as “upward” and “downward” indicate relative directions that depend only on the relative positional relationship of the constituent members, and include vertical and horizontal directions. It does not indicate the absolute direction.

The present invention is useful for capacitors used in various electronic equipment, electrical equipment, industrial equipment, vehicle electrical equipment, and the like.

1 Film capacitor (capacitor)
10 Capacitor Element Unit 20 Case 20a Opening 20b Open End 21 Front Side (First Side)
22 Rear side (first side)
24 Right side (second side)
25 First barrier portion 26 Second barrier portion 27 Second barrier portion 30 Filling resin 100 Capacitor element 111 Upper end face electrode (electrode)
112 Lower end face electrode (electrode)
200 Upper bus bar (bus bar)
220 Upper overlapping part (leading part)
220a surface 220b side end surface 300 lower bus bar (bus bar)
330 Lower polymerization part (outgoing part)
330a surface 330b side end face

Claims

A capacitor element unit in which a plate-like bus bar is connected to the electrode of the capacitor element;
A case in which the capacitor element unit is accommodated;
A filling resin filled in the case,
The bus bar extends to the opening side of the case so that the surface thereof is close to and opposed to the inner wall of the case, and is led out of the case from the opening.
A first barrier portion facing the surface of the lead-out portion of the bus bar led out from the case and wider than the width of the surface of the lead-out portion is extended from the opening end of the case.
Capacitor characterized by that.
The capacitor of claim 1,
The bus bar is in close proximity to the inner wall whose side end surface intersects the inner wall in close proximity to the surface of the bus bar,
A second barrier portion facing the side end surface of the lead-out portion and wider than the side end surface of the lead-out portion extends from the opening end portion of the case so as to connect to the first barrier portion.
Capacitor characterized by that.
The capacitor according to claim 2,
A plurality of the capacitor elements are provided in a predetermined direction,
The case has a first side surface along the arrangement direction of the capacitor elements, and a second side surface along the direction orthogonal to the arrangement direction and narrower than the first side surface,
The surface of the bus bar is in close proximity to the inner side wall of the second side surface, and the side end surface of the bus bar is in close proximity to the inner side wall of the first side surface,
The first barrier portion extends from an opening end portion on the second side surface, and the second barrier portion extends from an opening end portion on the first side surface.
Capacitor characterized by that.