JP6679400B2 - Caseless film capacitor - Google Patents

Description

  According to the present invention, a capacitor unit is configured by connecting an external lead-out terminal to a single or a plurality of capacitor elements, and a plurality of the capacitor units are arranged in a state where the element axis directions are parallel to each other. The present invention relates to a caseless film capacitor in which a root portion of a lead terminal is covered with an exterior resin.

  Caseless film capacitors are generally considered to be advantageous for downsizing, weight saving, and cost reduction (see, for example, Patent Documents 1 and 2).

  The structure of a conventional caseless film capacitor is shown in FIGS. 4 and 5 and will be described below. FIG. 4 is a perspective view showing the structure of a conventional caseless film capacitor, and FIG. 5 is a transverse sectional view thereof. In FIG. 4, the capacitor unit embedded in the exterior resin is transparently illustrated.

  As shown in FIG. 4, in the conventional caseless film capacitor, the whole (three in FIG. 4) capacitor elements 1 and the roots of the external lead terminals 3 are covered with the exterior resin 4. Here, the direction in which the three capacitor elements 1 are arranged is referred to as a unit arrangement direction X. The axial direction of the capacitor element 1 is the element axial direction Z (vertical direction in the drawing), and the direction perpendicular to both the unit arrangement direction X and the element axial direction Z is the thickness direction Y.

  On both end surfaces of each capacitor element 1 in the axial direction Z, metal electrodes 2 connected to the positive electrode and the negative electrode of the capacitor element 1 are formed by metal spraying or the like. The external lead terminals 3 and 3 are individually connected to the positive and negative metal electrodes 2 and 2. The external lead-out terminals 3 and 3 are called bus bars having a relatively large plate thickness.

  The caseless film capacitor in which the entire capacitor element 1 and the roots of the external lead terminals 3 are covered with the exterior resin 4 is manufactured by injection molding using a molding die. In this respect, a film capacitor with a case, which is made by housing the capacitor element and the roots of the external lead terminals in a plastic case and potting a molten resin in the case, is very different.

  Each of the three capacitor elements 1 has a flat columnar body whose cross section is oval, and the element axial directions (directions perpendicular to the oval surface) Z are parallel to each other.

  The main side surface 1a (a pair of ones face outward in the thickness direction Y) of an oval flat columnar body which is a three-dimensional shape of the capacitor element 1 is a side surface having the largest area among the outer surfaces of the capacitor element 1. However, the three capacitor elements 1 are arranged such that their main side surfaces 1a are located in the same plane. Next is the oval side surface 1b in the element axial direction Z (a pair of elements are facing each other outward in the Z direction), but the three capacitor elements 1 are side surfaces 1b in the respective element axial direction Z. Are arranged so that they are positioned in the same plane. The two coplanar planes are perpendicular to each other.

  The external lead-out terminals 3 on the negative electrode side of the three capacitor elements 1 constitute an integrated common ground terminal. The three positive electrode side external lead-out terminals 3 may be used as capacitance parts of circuits different from each other or may be used as capacitance parts of circuits common to each other.

JP2012-234932A JP, 2014-138083, A

  In the conventional caseless film capacitor, as shown in FIG. 5, the outer surface of the exterior resin 4 is substantially similar to the virtual unit envelope surface enclosing the outer surfaces of the plurality of capacitor elements 1 arranged side by side. It has a shape like That is, although each capacitor element 1 is an oval flat columnar body, the outer surface of the exterior resin 4 is also a similar oval flat columnar body.

  In actual use, the plurality of capacitor elements 1 each generate heat. The heat moves from the high temperature side capacitor element 1 toward the low temperature side capacitor element 1. That is, when the circuit characteristics, such as the rated current and the rated voltage, of the circuit to which the capacitor element 1 is connected are different from each other, the temperature difference between them becomes remarkable, and the thermal interference between the plurality of capacitor elements 1 becomes large. Problem arises. In the caseless film capacitor of the related art, if the temperature difference between the one capacitor element 1 and the other capacitor element 2 becomes large, they cause thermal interference with each other, deteriorating the performance of the caseless film capacitor and shortening its life. There was an inconvenience such as shortening.

  On the other hand, another problem is how to draw out the external lead-out terminal 3. In the conventional caseless film capacitor, the external lead-out terminal 3 is generally drawn out from the outer surface of the exterior resin 4 from the side surface in the element axis direction Z. On the outer surface of the exterior resin 4, a main side surface 4a which is a side surface extending along both the unit arrangement direction X and the element axial direction Z, a side surface 4b corresponding to the end surface in the element axial direction Z, and a side surface 4c corresponding to the end surface in the unit arrangement direction X. There is. A pair of these three types of side surfaces are outward facing surfaces. In the case of the conventional example, out of these three types of side surfaces, the external lead-out terminal 3 is exclusively drawn out from any one side surface.

  However, in recent years, the circuit configuration of a device (for example, an inverter device) to which a caseless film capacitor is connected has become complicated, and accordingly, the number of external lead-out terminals 3 to be pulled out from each capacitor unit has increased, and the external lead-out from the exterior resin 4 has been increased. A high degree of freedom is required for the position and direction of the lead-out of the terminal 3.

  However, in the conventional caseless film capacitor, the extraction of the external lead-out terminal 3 is still limited to only one side, and the degree of freedom of the external lead-out terminal 3 is low, which makes it difficult to assemble the device. There was a risk of causing it.

  In addition, as a background that the extraction of the external lead-out terminal 3 is limited to only one side, in the process of manufacturing a film capacitor with a case by the potting method, the capacitor unit is housed inside a plastic case, and Since the liquid resin is potted in the space between the capacitor unit and the plastic case), the extraction of the external lead terminals may be naturally limited to the case opening surface (top surface). The general technical common sense of the film capacitor with a case was directly followed in the caseless film capacitor.

  The present invention has been made in view of such circumstances, and relates to a caseless film capacitor by suppressing thermal interference between the capacitor units due to heat transfer inside the exterior resin. The purpose is to maintain performance and ensure a long life, increase the degree of freedom in drawing out the external lead-out terminal, and ensure the ease of assembly for a recent device having a complicated circuit configuration.

  The present invention solves the above problems by taking the following means.

The caseless film capacitor according to the present invention is
An external lead-out terminal is connected to a single or a plurality of capacitor elements to form a capacitor unit, and a plurality of capacitor units are arranged in a state in which their respective element axis directions are parallel to each other, and A caseless film capacitor in which the whole and the root of each external lead terminal are covered with an exterior resin,
Among the plurality of capacitor units, one of the capacitor units and the other of the capacitor units are arranged apart from each other in the unit alignment direction of the capacitor unit,
A unit in which the capacitor unit between the one capacitor unit and the other capacitor unit does not correspond in position on a pair of main side surfaces of the exterior resin facing each other in a state along the unit alignment direction and the element axis direction. A constriction is formed in the blank area that is recessed inward in the facing direction of the pair of main side surfaces, and the capacitor unit is positioned to correspond to the dimension of the outer side of the exterior resin of the exterior resin in the unit blank area that faces each other. Is smaller than the above-mentioned crossover dimension of the exterior resin in the unit existing area,
Further, with respect to the lead-out of the external lead-out terminal, the external lead-out terminal is drawn out at least at a main side surface of the exterior resin.

  In the above configuration of the present invention, the capacitor unit has the capacitor element and the external lead terminals connected to the positive and negative metal electrodes thereof, and the number of capacitor elements may be singular or plural. Good. A plurality of such capacitor units are arranged in a state in which the individual element axial directions (axial directions of the capacitor elements) are parallel to each other. Adjacent capacitor units are usually arranged in relatively close proximity. The functions of the individual capacitor units are independent from each other. One capacitor unit functions as a capacitance for a circuit, and another capacitor unit is provided as a capacitance for another circuit. For example, it is used for a smoothing circuit and a filter circuit in an in-vehicle inverter device.

  In the plurality of capacitor unit groups, the whole of each capacitor element and the root portion of each external lead terminal are covered with an exterior resin. With respect to the outer surface of the exterior resin covering the capacitor unit group, the side surface along both the unit arranging direction (capacitor unit arranging direction) and the element axial direction is the main side surface of the exterior resin. The main side surfaces are opposed to each other in a direction perpendicular to the main side surfaces (outward facing). A feature of the present invention is that one of the plurality of capacitor unit groups and the other capacitor unit are arranged separately in the unit alignment direction, and a constriction is formed in a pair of main side surfaces of the exterior resin. It is that.

  That is, the main side surface is divided into two regions in the unit arrangement direction. One is a unit existing area where the capacitor unit corresponds to the position, and the other is a unit blank area where the capacitor unit between one capacitor unit and another capacitor unit does not correspond to the position. The constriction that is recessed in the main side surface is formed in the unit blank area. The concave direction of the constriction is inward of the facing direction of the pair of main side surfaces (direction perpendicular to the main side surface).

  By forming a constriction in the main side surface of the exterior resin, the crossover dimension between the main side surfaces facing outward of the exterior resin in the unit blank area is the exterior facing direction of the exterior resin in the unit existing area. It is shorter than the dimension between the main side surfaces.

  By forming a concavity in the main side surface of the exterior resin, the entire exterior resin is divided into a unit presence region aligned in the unit alignment direction and a unit blank region sandwiched between adjacent unit presence regions. . The unit blank area of the exterior resin corresponds to the constricted recess. The crossover dimension of the unit blank area of the exterior resin is narrower than the crossover dimension of the unit existing area of the exterior resin. That is, the unit blank area of the exterior resin has a smaller thickness than the unit presence area of the exterior resin, and the cross-sectional area is accordingly smaller.

  Circuits connected to one capacitor unit embedded in one unit existing area of the exterior resin and another capacitor unit embedded in the other unit existing area are different from each other. (Rated voltage and current are not the same). Therefore, although the calorific values differ between the capacitor units, it is convenient for maintaining performance and life that the calorific value does not move between the one capacitor unit and the other capacitor unit as much as possible (thermal interference Avoidance).

  The amount of transferred heat increases as the cross-sectional area of the boundary surface between adjacent unit existing regions increases, and increases as the distance between the units decreases. In the conventional caseless film capacitor, since the cross-sectional area of the exterior resin at the unit boundary surface is relatively large and the distance between the units is relatively small, the amount of transferred heat was also relatively large. On the other hand, in the case of the present invention, the one capacitor unit and the other capacitor unit are arranged separately in the unit arranging direction, and a constriction is formed to recess in the unit blank area at the boundary to reduce the cross-sectional area. Therefore, the transfer heat amount can be suppressed.

  Therefore, according to the present invention, it is possible to bring about favorable effects on performance maintenance and life of the caseless film capacitor.

  On the other hand, it is preferable not to limit the position where the external lead terminal is pulled out from the exterior resin in terms of the electrical characteristics of the capacitor and the convenience of the attachment structure to the fixed portion such as the frame. The higher the degree of freedom of drawing out the external lead-out terminal, the more advantageous the circuit characteristics such as the reduction of the impedance and inductance of the capacitor. It is desirable to increase the degree of freedom in arranging the external lead terminals as the number of capacitor elements embedded in the exterior resin increases.

  The main side surface of the exterior resin has a wider deployment area than the other side surfaces (side surfaces at both ends in the element axis direction and side surfaces at both ends in the unit arrangement direction). Therefore, the degree of freedom in the position and direction of the lead-out terminal of the external lead-out terminal on the main side surface of the exterior resin is significantly higher than that on the other side surfaces.

  INDUSTRIAL APPLICABILITY The caseless film capacitor of the present invention is configured so that the external lead-out terminal can be pulled out at least on the main side surface (wide deployment area) of the exterior resin, and thus is applied to a recent device having a complicated circuit configuration. It is advantageous for the caseless film capacitor to ensure its ease of assembly. Further, the amount of resin used for the amount of the constriction is reduced, and the material cost is reduced.

  Although the external lead-out terminal is drawn out from the main side surface of the exterior resin exclusively, it may be drawn out from a side surface other than the main side surface.

  According to the present invention, the one capacitor unit and the other capacitor unit are spaced apart from each other in the unit side-by-side direction, and a constriction is formed in the unit blank area between the one capacitor unit and the other capacitor unit. Since it is provided, the amount of heat transferred between adjacent units can be reduced, thermal interference between the units can be suppressed, and the performance maintenance and life of the caseless film capacitor can be favorably influenced. In addition, the amount of resin used due to the constriction is reduced, which leads to a reduction in material cost. At the same time, the external lead terminals are configured to be pulled out from at least the main side surface of the exterior resin that has a constriction that is recessed, but this main side surface has a relatively large expansion area compared to the other side surfaces. Since the degree of freedom of pulling out the lead terminal is increased, it has an advantageous effect on circuit characteristics such as reduction of impedance and inductance of the capacitor.

1 is a perspective view showing a structure of a caseless film capacitor according to an embodiment of the present invention (a capacitor unit embedded inside is transparently shown). FIG. 1 is a perspective view of a caseless film capacitor, which corresponds to FIG. 1 and shows the capacitor unit embedded inside with the exterior resin removed. Cross-sectional view of a caseless film capacitor in an embodiment of the present invention Perspective view showing the structure of a conventional caseless film capacitor Cross-sectional view of a conventional caseless film capacitor

  Hereinafter, the embodiment of the caseless film capacitor of the present invention having the above-described structure will be described in detail at the level of a specific example.

  FIG. 1 is a perspective view showing the structure of a caseless film capacitor according to an embodiment of the present invention, in which a capacitor unit embedded inside is shown in a transparent manner. FIG. 2 corresponds to FIG. 1, and is a perspective view of the caseless film capacitor showing the capacitor unit embedded inside with the exterior resin removed, and FIG. 3 is a cross section of the caseless film capacitor. It is a figure.

  In these drawings, 1 is a capacitor element, 2 is a metal electrode (metallikon) formed on the end face of the capacitor element 1, 3 is an external lead terminal (bus bar) for conduction connected to the metal electrode 2, and 4 is a capacitor element. It is an exterior resin that covers the entire base 1 and the root of the external lead-out terminal 3. The external lead-out terminal 3 has a pair of positive electrode side and negative electrode side. U1 is a first capacitor unit and U2 is a second capacitor unit. X is a unit arranging direction in which the three capacitor elements 1 are arranged, Z is an element axial direction which is an axial direction of the capacitor element 1 (vertical direction in the drawing), and Y is both the unit arranging direction X and the element axial direction Z. Is a thickness direction which is a direction perpendicular to.

  The capacitor element 1 is configured as follows. A metallized film consisting of a dielectric film and a metal-deposited electrode is wound to form a cylindrical metallized film roll, and an outer film is further wound around the outer periphery of the roll and heat-sealed. To obtain a composite film roll. Next, the wound composite film is diametrically pressed into an oval flat columnar body, and metal electrodes are formed by thermal spraying of fine metal particles on both ends of the flat columnar body in the axial direction to form a capacitor element. Instead of winding a long metallized film, a plurality of relatively short metallized film sheets may be laminated.

  Metal electrodes 2 connected to the positive electrode and the negative electrode of the capacitor element 1 are formed by metal spraying or the like on both end surfaces in the axial direction of the capacitor element 1 having an oval cross section and a flat columnar shape. The external lead terminals 3 and 3 are individually connected to the positive and negative metal electrodes 2 and 2. The positive electrode and negative electrode external lead-out terminals 3, 3 are called busbars having a relatively large plate thickness, and are assumed to have a plate thickness of at least 0.5 mm, typically about 1.5 to 2.5 mm. .

  The first capacitor unit U1 is composed of one capacitor element 1 and the external lead terminals 3 and 3 connected to the pair of positive and negative metal electrodes 2 and 2. Further, the second capacitor has two capacitor elements 1 and 1 arranged along the unit arrangement direction X and external lead terminals 3 and 3 commonly connected to the pair of positive and negative metal electrodes 2 and 2, respectively. The unit U2 is configured.

  The three capacitor elements 1 having an oval flat columnar shape have their element axis directions Z (directions perpendicular to the oval surface) Z parallel to each other.

  The main side surface 1a of the flat columnar body (a pair of ones face outward) sandwiched between the upper and lower oval linear portions of the capacitor element 1 is the side surface having the largest area of the outer surface of the capacitor element 1. However, the three capacitor elements 1 are arranged such that their main side surfaces 1a are located in the same plane (see particularly FIG. 3). Next is the side surface 1b which is the oval surface (a pair of members are opposed to each other in the axial direction of the element). The three side surfaces 1b of the three capacitor elements 1 are on the same plane (parallel to the XY plane). They are arranged in a posture that lies within the plane. The two coplanar planes are perpendicular to each other.

  The two capacitor elements 1 forming the second capacitor unit U2 are arranged in the unit alignment direction X so as to be close to each other. The external lead-out terminal 3 on the negative electrode side constitutes a common ground terminal integrated with the two capacitor elements 1. The external lead-out terminal 3 on the positive electrode side may be used as a capacitance portion of circuits different from each other, or may be used as a capacitance portion of circuits common to each other. Further, even though it is referred to as another circuit, since the two capacitor elements 1 are connected in parallel, it means another circuit having the same function and the same specification.

  The first capacitor unit U1 is used in another circuit having a level different in function and specifications from the circuit in which the second capacitor unit U2 is used. For example, the first capacitor unit U1 is used for a filter circuit in an in-vehicle (HEV (hybrid electric vehicle)) inverter device, and separately from this, the second capacitor unit U2 is used for a smoothing circuit in the inverter device. The situation is such that

  Under such circumstances, the first capacitor unit U1 and the second capacitor unit U2 have different circuit characteristics such as rated voltage and rated current. The first capacitor unit U1 and the second capacitor unit U2 having different circuit characteristics are covered with the exterior resin 4 and treated as an integral part.

  The problem here is heat transfer. If the amount of heat generated by the first capacitor unit U1 is large and the temperature thereof is higher than the temperature of the second capacitor unit U2, heat transfer from the first capacitor unit U1 toward the second capacitor unit U2. Occur. On the contrary, if the amount of heat generated by the second capacitor unit U2 is large and its temperature becomes higher than the temperature of the first capacitor unit U1, heat transfer from the second capacitor unit U2 toward the first capacitor unit U1. Happens. In any case, the heat transfer is performed via the boundary surface between the first capacitor unit U1 and the second capacitor unit U2.

  In the caseless film capacitor of the present embodiment, the first capacitor unit U1 and the second capacitor unit U2 are arranged so as to be separated in the unit arrangement direction X. The separation distance in the unit arrangement direction X between the first capacitor unit U1 and the second capacitor unit U2 is larger than the distance in the unit arrangement direction X between the capacitor elements 1 configuring the second capacitor unit U2. . In the present embodiment, the two capacitor elements 1 forming the second capacitor unit U2 are arranged adjacent to each other in the unit alignment direction X, and the first capacitor unit U1 and the second capacitor unit U2 are separated from each other. The distance is 5 to 20 mm. In order to avoid thermal interference, the distance between the units is preferably 5 mm or more from the viewpoint of ensuring the distance between the units and forming an appropriate constriction 4d. By forming the constriction 4d, the cross-sectional area of the resin portion that serves as the heat transfer path is reduced. Further, in order to secure the resin strength of the constricted portion 4d, it is preferable that the size of the recessed portion of the constricted portion 4d is about the thickness of the exterior resin 4 of the covering portion of the capacitor element 1.

  On the other hand, from the viewpoint of avoiding thermal interference, it is sufficient that the thickness is 2 to 3 times the thickness of the exterior resin 4 (coating thickness, which is 5 mm in this embodiment). Even if the separation distance between the units is more than four times the thickness of the exterior resin 4, a large effect of avoiding thermal interference cannot be expected, and the constriction amount (concave size) of the constriction 4d becomes large. The resin strength may decrease. Therefore, the distance between the units is preferably 20 mm or less.

  Further, in the caseless film capacitor of this embodiment, the exterior resin 4 located in the unit blank area B between the first capacitor unit U1 and the second capacitor unit U2 has the inner side in the thickness direction Y. There is formed a constriction 4d that is recessed toward. The constriction 4d is formed in a groove shape along the element axis direction Z. The constrictions 4d are formed symmetrically on both the main side surfaces 4a, 4a of the pair of exterior resins 4 facing each other.

As a result of forming the constrictions 4d, 4d on the main side surfaces 4a, 4a of the exterior resin 4, in the unit blank area B, the transfer dimension L _B between the main side surfaces 4a, 4a facing outward of the exterior resin 4 is the unit existence area. It becomes shorter than the dimension L _A of the outer side of the exterior resin 4 facing each other at A, which is between the main side surfaces 4a and 4a.

That is, diametral dimension L _B of the unit blank area B of the exterior resin 4 is narrower than the diametral dimension L _A units existing area A of the exterior resin 4, as compared with the unit existing area A of the outer resin 4, the exterior resin The unit blank area B of No. 4 has a small thickness, and accordingly the cross-sectional area is small. The crossover dimension L _A of the unit existing area A can be set to the crossover dimension L _B of the unit blank area B plus twice the thickness of the exterior resin 4.

When the boundary sectional area between units in the case of the present embodiment (the sectional area of the unit blank area B) and S _B, the boundary sectional area between units in the case of the conventional example shown in FIG. 5 and S _B ', formed The sectional area S _B is smaller than the sectional area S _B ′ by the amount of the narrowed portion 4d. Therefore, it is possible to suppress the movement amount of heat depending on the amount of reduced cross-sectional area S _B of the unit blank area B of the boundary.

  As described above, according to the present embodiment, the first capacitor unit U1 and the second capacitor unit U2 are arranged so as to be separated from each other in the unit alignment direction X, and the constrictions 4d and 4d that are recessed in the unit blank area B are formed. Since the cross-sectional area is reduced, thermal interference between the units can be avoided, and the performance and life of the caseless film capacitor can be extended. In addition, the amount of resin used is reduced by the amount of the constrictions 4d and 4d, and the material cost is reduced.

  Further, the pull-out position of the external lead-out terminal 3 is configured as follows. The main side surface 4a having a large area is selected from the side surfaces of the exterior resin 4 in the three directions as the location where the constriction 4d is formed. However, this suppresses thermal interference between the units as described above, and thus the capacitor unit 2 This is the result of making the narrowest side surfaces of the side surfaces facing each other in the unit arranging direction X and reducing the boundary cross-sectional area between the units of the exterior resin 4 serving as the heat transfer path.

  The same main side surface 4a in which the constriction 4d is formed is selected as the extraction location of the external extraction terminals 3 and 3. Since the main side surface 4a of the exterior resin 4 has a large area, drawing out the external lead terminals 3, 3 from this surface leads to an increase in the degree of freedom of drawing.

  When the degree of freedom in drawing out the external lead-out terminals 3 and 3 is increased, it is advantageous for improving the circuit characteristics such as impedance and inductance of the caseless film capacitor. This becomes more advantageous as the number of capacitor elements 1 embedded in the exterior resin 4 increases.

  The external lead terminal 3 used for the film capacitor is called a bus bar, and is a relatively thick metal plate having a plate thickness of at least 0.5 mm. Since it is thick and has a relatively high bending strength, it may cause an assembly tolerance when it is assembled to an external device or a resistance element for assembly work. For a caseless film capacitor applied to recent devices having a complicated circuit configuration, the improvement in the degree of freedom of pulling out the external lead-out terminal 3 as described above reduces the number of bent portions of the external lead-out terminal 3 and assembles the same. This has an advantageous effect on ensuring the easiness of. In addition, this leads to a reduction in the routing distance of the external lead terminal 3 and contributes to improved characteristics such as reduced inductance.

  The external lead-out terminals 3 and 3 may be pulled out not only from the main side surface 4a of the exterior resin 4 but also from side surfaces other than the main side surface 4a.

  Each of the plurality of capacitor units may have one capacitor element 1 or a plurality of capacitor elements 1. In the case of a plurality, the number is arbitrary 2 or more.

  Further, although the case of two capacitor units is illustrated, the number of capacitor units may be three or more.

  Further, in the above-described embodiment, the constriction 4d is formed only on the main side surface 4a of the exterior resin 4, but the side surface orthogonal to the main side surface 4a (upper and lower surfaces facing the element axial direction Z of FIGS. 1 and 2) is also formed. , A constriction may be formed. However, when there is a common electrode bridging between the capacitor units, it is preferable not to form the constriction, because the common electrode requires a separate bending process to form the constriction. For example, when the negative electrode side is the common electrode between the capacitor units, it is preferable to form the constriction in the element axial direction Z only on the positive electrode side without forming the constriction in the element axial direction Z on the negative electrode side. .

  INDUSTRIAL APPLICABILITY The present invention is useful as a technique for reducing the product cost while improving the performance maintenance and life of the caseless film capacitor by suppressing the thermal interference between the adjacent unit existing regions with respect to the caseless film capacitor. .

1 Capacitor Element 3 External Lead-out Terminal 4 Exterior Resin 4a Main Side of Exterior Resin 4d Constriction A Unit Presence Area B Unit Blank Area U1 First Capacitor Unit U2 Second Capacitor Unit Z Element Axial Direction

Claims (3)

An external lead-out terminal is connected to a single or a plurality of capacitor elements to form a capacitor unit, and a plurality of capacitor units are arranged in a state in which their respective element axis directions are parallel to each other, and A caseless film capacitor in which the whole and the root of each external lead terminal are covered with an exterior resin,
Among the plurality of capacitor units, one of the capacitor units and the other of the capacitor units are arranged apart from each other in the unit alignment direction of the capacitor unit,
A unit in which the capacitor unit between the one capacitor unit and the other capacitor unit does not correspond in position on a pair of main side surfaces of the exterior resin facing each other in a state along the unit alignment direction and the element axis direction. A constriction is formed in the blank area that is recessed inward in the facing direction of the pair of main side surfaces, and the capacitor unit is positioned to correspond to the dimension of the outer side of the exterior resin of the exterior resin in the unit blank area that faces each other. Is smaller than the above-mentioned crossover dimension of the exterior resin in the unit existing area,
Furthermore, with respect to the lead-out of the external lead-out terminal, the external lead-out terminal is pulled out at least on the main side surface of the exterior resin, wherein the caseless film capacitor is provided. The caseless film capacitor according to claim 1, wherein the other capacitor unit includes a plurality of capacitor elements arranged in the unit arranging direction.
A separation distance between the one capacitor unit and the other capacitor unit in the unit arrangement direction is larger than a distance between the plurality of capacitor elements forming the other capacitor unit. Caseless film capacitor.   The caseless film capacitor according to claim 1 or 2, wherein the external lead-out terminal is drawn out not only from the main side surface of the exterior resin but also from side surfaces other than the main side surface.

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