JP6369049B2 - Multilayer film capacitor, capacitor module, and power conversion system - Google Patents

Description

  The present invention relates to a multilayer film capacitor, a capacitor module, and a power conversion system.

  In a multilayer film capacitor, dielectric breakdown may occur in the dielectric film due to a defect in the dielectric film, contamination of foreign matter, etc., and the internal electrodes may be short-circuited, and a short-circuit current may flow between the internal electrodes. Once the dielectric breakdown occurs, a short-circuit current continuously flows through the dielectric breakdown points of the dielectric film.

  In order to solve this problem, multilayer capacitors including a fuse portion that cuts off a short-circuit current are disclosed in Patent Documents 1 to 3.

  The fuse parts disclosed in Patent Documents 1 to 3 are made of the same metal film as the internal electrode (metal film), and connect the divided electrode formed by dividing the internal electrode and the metallized part.

  Since the fuse part is thin and thin, the electric resistance is large, and when a short-circuit current flows, it generates heat and liquefies and evaporates. As a result, the divided electrode at the location where the short circuit occurs is disconnected from the circuit, and the insulation between the internal electrodes is restored.

Japanese Patent Publication No. 7-70418 JP 2004-200508 A JP 2004-363431 A

  In a multilayer film capacitor having a fuse portion, it is important that the electrically disconnected state of the fuse portion is maintained after the occurrence of a short circuit. By maintaining the disconnected state, the state in which the divided electrode in which the short circuit has occurred is electrically disconnected from the metallicon part is maintained, so that the insulating state between the internal electrodes is maintained.

  However, when the evaporated metal component of the fuse portion is cooled and liquefied or solidified by the dielectric film in the vicinity of the original fuse portion, the short-circuited split electrode becomes conductive with the metallicon portion, and the short-circuit current flows again. is there. In order to avoid such a situation, it is necessary to prevent the evaporated metal component from being liquefied or solidified in a narrow region near the original fuse portion.

  In a multilayer film capacitor having a fuse portion, in each layer, there is a void portion surrounded by an end face in the thickness direction of the fuse portion and upper and lower dielectric films and having no metal film. The gap that exists adjacent to the fuse portion has a shape such that the distance between the upper and lower dielectric film surfaces decreases as the distance from the fuse portion increases, and the distance between the upper and lower dielectric film surfaces becomes zero at a certain distance. . The fuse portion has a function of a support for forming a gap portion on both sides thereof. This void portion becomes a region where the metal component evaporated at the time of a short circuit diffuses, and at the same time, the evaporated metal component is cooled and liquefied and solidified. The larger the gap, the more it is possible to prevent the split electrode in which a short circuit has occurred from being brought into conduction again with the metallicon when the evaporated metal component is liquefied or solidified.

  The multilayer film capacitor shown in FIG. 1 of Patent Document 1 is created by winding and laminating a dielectric film on which a metal film including a fuse portion is formed. For this reason, the positions of the wound fuse portions of each layer are not aligned on one straight line in the stacking direction but are arranged apart. This is because the interval between the fuse portions is not set in consideration of the length of the circumference when winding. Further, even when the winding diameter is not sufficiently large with respect to the stacking thickness, the positions of the fuse portions are not aligned on one straight line in the stacking direction.

  The situation is the same in Patent Documents 2 and 3. Conventional multilayer film capacitors have a first film in which a first internal electrode including a fuse portion is formed on the surface of a dielectric film, and a second film in which a second internal electrode is formed on the surface of the dielectric film. After the film is stacked and wound on the circumferential surface of the cylindrical body and laminated, a part is cut out to form a flat plate, and the metallicon part is attached. For this reason, the positions of the fuse portions of the respective layers on the respective stacked surfaces are not aligned on one straight line in the stacking direction, but are arranged apart.

  When the fuse parts of each layer are arranged in this manner, the gaps formed on both sides of the fuse part are not necessarily sufficiently spread, and when the metal component of the fuse part evaporated at the time of short circuit is liquefied or solidified In some cases, the split electrode in which the short circuit has occurred becomes conductive again with the metallized part.

  An object of the present invention is to provide a multilayer film capacitor having a fuse portion, in which after the fuse portion evaporates, it can be liquefied or solidified to prevent the divided electrode corresponding to the fuse portion from becoming conductive again. Type film capacitor, capacitor module, and power conversion system.

In order to achieve the above object, a multilayer film capacitor according to a first aspect of the present invention includes a first film in which a metal film is formed as a first internal electrode on a dielectric film, and a dielectric film. A laminate in which a plurality of second films each having a metal film formed as a second internal electrode are alternately laminated, a first electrode connected to the first internal electrode, and the second internal electrode And at least one of the first internal electrode and the second internal electrode is narrower than the other part of the metal film on the dielectric film surface. A laminated film capacitor having a fuse portion which is a narrow portion of the metal film, wherein the fuse portion is arranged at least every other layer on the surface of the dielectric film, and the first internal An electrode and the second internal power Each includes the fuse portion and a dummy fuse portion formed of the metal film having the same shape as the fuse portion, and the dummy fuse portion is formed in the adjacent layer in the region where the metal film is not formed. It is formed at a position where the fuse part and the position on the laminated surface are aligned, and the position on the laminated surface of the fuse part is aligned with the position on the laminated surface of the fuse part or the dummy fuse part of the adjacent layer, In at least some of the plurality of layers that are continuous in the stacking direction, the fuse section is aligned with the fuse section or the dummy fuse section of the other layer on the stacking surface .

  The fact that the positions are aligned between the layers may mean that the positional deviation of the fuse portion between the stacked layers is within three times the width of the narrow portion.

Capacitor module according to a second aspect of the present invention, and one or more of the multilayer film capacitor according to the first viewpoint, a container for housing the one or more of the multilayer film capacitor, said first A first external electrode connected to an electrode, a part of which is drawn out of the container, and a second external electrode connected to the second electrode, a part of which is drawn out of the container; And a sealing material that fills the container and seals the multilayer film capacitor.

Power conversion system according to a third aspect of the present invention, in the power conversion system for converting one DC power and AC power to the other, the first laminated film capacitor in accordance with the viewpoint, and the second aspect At least one of the capacitor modules is used as a smoothing capacitor for reducing a surge superimposed on a DC voltage.

  In the multilayer film capacitor according to the present invention, the positions of the fuse portions on each laminated surface are aligned at least every other layer, so that the gaps formed on both sides of the fuse portion are smaller than when not aligned. Widens away from the fuse. Therefore, after the fuse part has evaporated due to a short circuit, a highly reliable multilayer film capacitor that can prevent the internal electrode that has undergone a short circuit from becoming conductive again due to the liquefied or solidified evaporated relative component. Can be provided. Furthermore, it is possible to provide a highly reliable capacitor module and power conversion system using such a multilayer film capacitor.

It is a perspective view which shows a part of lamination | stacking state of the multilayer film capacitor which concerns on Embodiment 1 of this invention. It is a figure which shows the detailed example of the 1st film and 2nd film of the multilayer film capacitor which concerns on Embodiment 1. FIG. 1 is a cross-sectional view of a multilayer film capacitor according to Embodiment 1. FIG. (A) It is BB sectional drawing of the multilayer film capacitor shown in FIG. (B) It is sectional drawing of the part corresponding to FIG. 4 (a) of the conventional multilayer film capacitor. It is a figure which shows the detailed example of the 1st film of the multilayer film capacitor which concerns on the 1st modification of Embodiment 1, and a 2nd film. It is a figure which shows the detailed example of the 1st film of the multilayer film capacitor which concerns on the 2nd modification of Embodiment 1, and a 2nd film. It is sectional drawing of the multilayer film capacitor shown in FIG. FIG. 6 is a cross-sectional view of the multilayer film capacitor according to the third modification of the first embodiment, taken along line BB in FIG. (A) It is a perspective view of the multilayer film capacitor which concerns on Embodiment 1 which attached the external electrode. (B) It is sectional drawing of the capacitor | condenser module using the laminated film capacitor shown to Fig.9 (a). (A) It is a perspective view of the multilayer film capacitor which concerns on three Embodiment 1 which attached the external electrode. (B) It is sectional drawing of the capacitor | condenser module which uses the laminated film capacitor shown to Fig.10 (a). 1 is a circuit block diagram illustrating an example of a power conversion system using a multilayer film capacitor according to Embodiment 1. FIG.

(Embodiment 1)
The multilayer film capacitor according to the first embodiment is intended for a film capacitor having a fuse portion between a split electrode formed on at least one internal electrode and a metallicon portion. As shown in the perspective view of FIG. 1, the multilayer film capacitor is formed by laminating a plurality of layers (only four layers are shown in FIG. 1) of the first film 10 and the second film 20 alternately. And metallicon parts 4 and 5 respectively formed on two side surfaces of the laminate. The first film 10 includes a dielectric film 1 and a first internal electrode 2 formed of a metal film on the surface thereof. The second film 20 includes the dielectric film 1 and a second internal electrode 3 formed of a metal film on the surface thereof, and the second internal electrode 3 includes a fuse portion 6 that is a narrow portion. In FIG. 1, the first internal electrode 2 and the second internal electrode 3 are hatched to clearly show their shapes. The X, Y and Z directions of the Cartesian coordinate system were defined as shown. Other figures are similar.

  The fuse parts 6 of the second internal electrode part 3 exist every other layer, and the positions on the respective laminated surfaces are aligned. Metallicon parts 4 formed in the direction indicated by the thick arrows on both side surfaces in the Y direction of the laminate in which the first film 10 and the second film 20 are laminated (only the numbers are shown in FIG. And a metallicon portion 5 (only numbers are shown in FIG. 1 and also referred to as a second electrode 5). Metallicon part 4 is connected to first internal electrode 2, and metallicon part 5 is connected to second internal electrode 3.

The first film 10 and the second film 20 will be described in more detail.
The first film 10 is obtained by forming a metal film having the pattern shown in FIG. 2 as the first internal electrode 2 on the surface of the insulating dielectric film 1. The second film 20 is obtained by forming a metal film having a pattern shown in FIG. 2 as the second internal electrode 3 on the surface of the dielectric film 1. As shown in FIG. 2, the dielectric film 1 of the first film 10 and the second film 20 has a rectangular shape having the same size on the XY plane. In FIG. 2, the first internal electrode 2 and the second internal electrode 3 are hatched for easy understanding of their shapes.

  The dielectric film 1 is a sheet-like film formed of an insulating dielectric, and the first film 10 and the second film 20 are formed in a rectangular shape having the same size. The material is selected from, for example, polyethylene terephthalate (PET), polypropylene (PP), polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), mica, polystyrene (PS), or polycarbonate (PC). The thickness of the dielectric film 1 is usually about several micrometers, the length L in the Y direction of the dielectric film 1 shown in FIG. 2 is often several tens mm, and the width W in the X direction is often larger than the length L. It is about 10 mm to several hundred mm.

  The first internal electrode 2 is formed of a metal foil having a thickness of several μm, such as Al, Cu, or Ag, or a deposited film having a thickness of several tens of nm. As shown in FIG. 2, the first internal electrode 2 has a length Lm smaller than L and a width Wm from one end in the Y direction of the dielectric film 1 to the other end. It is formed to extend in the direction. The part of the first internal electrode 2 at the one end in the Y direction of the dielectric film 1 is in electrical contact with the metallized part 4 formed in the direction of the thick arrow in FIG.

The second internal electrode 3 is also formed of a vapor deposition film having a thickness of several tens of nm made of any one of Al, Cu, Ag, and the like. As shown in FIG. 2, the second internal electrode 3 includes one or more end electrodes 3 a extending in the X direction with a length La in the Y direction at the other end in the Y direction of the dielectric film 1. Divided electrodes 3b and a fuse portion 6 associated with each divided electrode 3b. The fuse portion 6 is formed of a metal film having a width W ₀ narrower than the size of the divided electrode 3b. The one or more divided electrodes 3b are formed in a stacked state in a region overlapping the first internal electrode 2 on the XY plane. Each divided electrode 3b is in electrical contact with the metallicon part 5 formed in the direction of the thick arrow in FIG. 1 via the respective fuse part 6 and end electrode 3a.

  In addition, as shown in FIG.1 and FIG.2, the 1st film 10 and the 2nd film 20 are the position shifted | deviated by s between each other, and about the X direction in FIG. As shown, the layers are laminated so that the positions at both ends thereof are aligned. As shown in FIG. 2, the shift length s in the Y direction is a value equal to or less than the length La in the Y direction of the end electrode 3a. By shifting the first film 10 and the second film 20 from each other by s in the Y direction, the first inner electrode 2 is moved in the Y direction at one end of the first film 10 in the Y direction. A portion extending in the X direction with a length s is exposed from the adjacent upper dielectric film 1. The metallicon part 4 is in contact with this exposed part. On the other hand, the second internal electrode 3 is exposed from the adjacent upper dielectric film 1 at the other end in the Y direction and extending in the X direction with a width s in the Y direction. Metallicon part 5 is in contact with this exposed part.

  FIG. 3 shows a cross-sectional view of the multilayer film capacitor 100 in which ten layers of the first film 10 and the second film 20 are laminated in this way, at the position AA in FIG. In FIG. 3, the first film 10 and the second film 20 are laminated at positions shifted from each other by s in the Y direction, and the metallicon part 4 is one end part of the first film 10 in the Y direction. A portion exposed from the upper dielectric film 1 in the vicinity is in contact with the first inner electrode 2, and the metallicon portion 5 is in contact with the second inner electrode 3 in the vicinity of the other end portion in the Y direction of the second film 20. Has been shown to do.

A method for manufacturing the multilayer film capacitor 100 according to the first embodiment will be described.
First, the dielectric film 1 is prepared, and a metal film having a pattern corresponding to the first internal electrode 2 and the second internal electrode 3 shown in FIG. 2 is formed thereon by vapor deposition.

  Next, the dielectric film 1 on which a metal film having a pattern corresponding to the first internal electrode 2 and the second internal electrode 3 is cut, and the first internal electrode 2 shown in FIG. A plurality of the film 10 and the second film 20 including the second internal electrode 3 are generated. The first film 10 and the second film 20 have the same size on the XY plane.

  Next, the first film 10 and the second film 20 are alternately laminated in a plurality of layers in the Z direction, and then subjected to pressure-bonding treatment to form a laminate (only four layers are shown in FIG. 1). At this time, the first film 10 and the second film 20 are laminated with their both ends in the X direction aligned and shifted in the Y direction by a length s as described above (FIGS. 1 to 3). reference). In addition, the dielectric film 1 having the same size as the first film 10 and the second film 20 on which the metal film is not formed is laminated for the insulation and protection of the internal electrodes as the uppermost layer. By the pressure-bonding process, the first film 10 and the second film 20 are aligned so that both ends in the X direction are aligned, and a laminate is maintained in which the positions of both ends in the Y direction are shifted from each other by s. .

  The laminated body is subjected to metallicon treatment on both side surfaces in the Y direction, and the metallicon portion 4 that comes into contact with the first internal electrode 2 formed in the laminated body, and the second internal electrode formed in the laminated body 3 is formed (FIG. 3).

  In addition, the 1st internal electrode 2 and the 2nd internal electrode 3 are each formed in the separate dielectric sheet 1, each dielectric sheet 1 is cut | disconnected, and the 1st film 10 and the 2nd film 20 May be formed.

  When the first internal electrode 2 of the first film 10 is formed of a metal foil, the first internal electrode 2 and the second internal electrode 3 must be formed on separate dielectric sheets. This is because the second internal electrode 3 in which the fuse portion 6 is formed needs to be formed of a vapor deposition film thinner than the metal foil so that the second internal electrode 3 is easily heated and liquefied after being short-circuited and then evaporated.

  In the multilayer film capacitor 100 according to the first embodiment formed as described above, every other layer of fuse portions 6 exists in the stacking direction as shown in FIG. The respective positions of the fuse portions 6 are aligned at the same position on the lamination surface even if the lamination position is changed. This is because the pattern of the metal film of the second film 20 is common and the positions of both ends in the X direction and the Y direction are aligned, so that the state can be maintained by pressure bonding. . In FIG. 4, both ends in the X direction are not shown, and the thicknesses of the first internal electrode 2 and the fuse portion 6 included in the second internal electrode 3 are drawn with emphasis. Further, in order to indicate that the fuse portion 6 is formed in the second internal electrode 3, “6 (3)” is displayed in FIG.

  In the laminated film capacitor 100 when laminated by conventional winding, as shown in FIG. 4B, the positions of the fuse portions 6 are not aligned on the laminated surface when the laminated position is changed.

  The gap 7 shown in FIGS. 4A and 4B is a gap formed on both sides of the fuse portion 6 by the side surface of the fuse portion 6 and the surfaces of the upper and lower dielectric films.

The gap 7 in the case of FIG. 4A expands in a direction away from the fuse part 6 as compared with the gap 7 in the case of FIG. 4B (in FIG. shown as _{1> W 2).}

  The fuse portion 6 serves as a support for forming the gap portion 7. Therefore, by stacking the fuse parts 6 at the same position, the dielectric film 1 is less likely to be pressed in the vicinity of the fuse part 6 when being crimped, as compared to the case where it is not. As a result, the gap portion 7 in the case of FIG. 4A expands in a direction away from the fuse portion 6 as compared with the gap portion 7 in the case of FIG.

  Also in the cross section taken along the line CC of FIG. 2 of the multilayer film capacitor 100 according to the first embodiment, the gap 7 expands in a direction away from the fuse 6. In the CC cross section, the first internal electrode 2 in the BB cross section does not exist. However, the effect that the gap portion 7 expands in the direction away from the fuse portion 6 does not change compared to the conventional case.

  As the gap portion 7 is enlarged, the possibility that the short-circuited divided electrode 3b is brought into a conductive state again with the metallicon portion 5 is reduced because the metal component of the fuse portion 6 evaporated by the short circuit is liquefied or solidified. Therefore, the multilayer film capacitor 100 according to Embodiment 1 has higher reliability than the conventional one in terms of reuse after a short circuit.

  FIG. 5 shows a first modification of the first embodiment. FIG. 5 is a diagram corresponding to FIG. 2, and the difference from FIG. 2 is that the first internal electrode 2 of the first film 10 is divided into an end electrode 2 a and a plurality of divisions in the same manner as the second internal electrode 3. That is, it is composed of the electrode 2b. The plurality of divided electrodes 2b include a fuse portion 6 having the same shape as the divided electrode 3b. The first inner electrode 2 of the first film 10 is formed of a metal film having the same pattern as the second inner electrode 3 of the second film 20 and is used after being rotated 180 degrees.

  The first film 10 and the second film 20 are arranged so that the end electrodes 2a and 3a are on opposite sides in the Y direction. The end electrodes 2a and 3a are laminated and pressure-bonded in such a manner that the end electrodes 2a and 3a are exposed from the upper dielectric film 1 by a length s from each other in the Y direction and the both ends in the X direction are aligned. Post-metallicon processing is performed.

  In this case, the metal film of the first film 10 is not formed of a metal foil. Like the second film 20, it is formed of a vapor deposition film.

  Also in this case, the fuse portions 6 of the second film 20 are aligned at the same position on the lamination surface every other layer in the lamination direction even if the lamination position is changed. What is different from the above is that the fuse portions 6 of the first film 10 are also arranged in the same position on the lamination surface even if the lamination position is changed every other layer in the lamination direction. At this time, the gap portions 7 formed on both sides of the fuse portion 6 are also enlarged in a direction away from the fuse portion 6 as compared with the case where the positions of the fuse portions 6 are not aligned. Note that when either one of the upper and lower fuse portions 6 is liquefied and evaporated, a short-circuit current does not flow to the divided electrode 3b corresponding to the corresponding fuse portion 6. Therefore, the laminated film capacitor 100 formed as shown in FIG. 5 can provide a more reliable laminated film capacitor 100 in terms of reuse after a short circuit.

Even if the positions of the fuse portions 6 in each layer are not strictly aligned, the effects described so far can be achieved as compared with the conventional multilayer film capacitor as long as they match within a certain accuracy. Is possible. The certain accuracy may be within three times the width W ₀ of the fuse portion 6, for example.

If it is sufficient that the positional deviation of the fuse part 6 is within three times the width W ₀ of the fuse part 6, not only the positions of the fuse parts 6 on the respective laminated surfaces are aligned for each layer, but also the fuse parts in all layers. The number of cases where it can be considered that the positions on the respective laminated surfaces 6 are aligned increases, and the width of the gap 7 is further increased. In such a case, a more reliable multilayer film capacitor can be provided in terms of reuse after a short circuit.

  FIG. 6 shows a second modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 5 and is different from FIG. 5 in that (1) the divided electrode 2b in the rightmost column of the first film 10 and the divided electrode 3b in the leftmost column of the second film 20 Further, as the dummy fuse portion, metal film projections 2c and 3c having the same size as the fuse portion 6 are attached, respectively. (2) The sizes and positions of the end electrodes 2a and 3a and the divided electrodes 2b and 3b are shown in FIG. The dimensions are set as a to e, and the shift width s is set to s = ce. The dummy fuse part does not have a function of a fuse, but means a part that is imitated as the fuse part 6 due to its arrangement.

At this time, the positions of the fuse portions 6 on the respective laminated surfaces in the BB cross section shown in FIG. 6 are not aligned every other layer as shown in FIG. 7, but are aligned in all layers. The positions of the fuse portions 6 on the laminated surfaces in the CC cross section and the DD cross section shown in FIG. 6 are also shown if the protrusions 2c and 3c, which are dummy fuse portions, are regarded as the fuse portions 6, respectively. As shown in FIG. 7, all layers are aligned, not every other layer. At this time, the fuse portions 6 and the dummy fuse portions appear alternately, and the positions on the respective laminated surfaces are aligned. In FIG. 7, the dummy fuse portion is also shown as the fuse portion 6 without being distinguished on the display. Further, in order to clearly indicate whether the fuse part 6 including the dummy fuse part is located on the first internal electrode 2 or the second internal electrode 3, the number is shown in parentheses. The size W ₁ ′ of the expansion of the gap 7 at this time is larger than the size W ₁ of the expansion of the gap 7 when the positions are aligned every other layer, and the expansion of the gap 7 when the positions are not aligned naturally it becomes larger than the size W ₂ of. Therefore, the possibility that the metal component of the fuse portion 6 evaporated due to the occurrence of the short circuit is liquefied or solidified, and the divided electrode 2b or 3b in which the short circuit has occurred becomes conductive again with the metallicon portion 4 or 5 is further reduced. Therefore, the multilayer film capacitor 100 according to Embodiment 1 has higher reliability than the conventional one in terms of reuse after a short circuit.

  FIG. 6 shows an example in which the divided electrodes are formed in two rows in the Y direction and four rows in the X direction. However, the present invention is not limited to this. Even when three or more rows are formed in the Y direction, dummy fuse portions are formed, and the lengths of the end electrodes 2a and 3a, the sizes and positions of the divided electrodes 2b and 3b, and the shift length s are devised. As a result, the position of the fuse portion 6 on the laminated surface can be made uniform in all layers. The multilayer film capacitor 100 thus formed can achieve the same effects as described above.

In the example shown in FIG. 6, when the protrusions 2 c _and 3 c are not provided, only the fuse part 6 located in the BB cross section has the positions on the respective laminated surfaces of the fuse part 6 aligned in all layers. As for the fuse portions 6 located in the CC cross section and the DD cross section, the positions on the respective laminated surfaces are aligned every other layer. Even in such a case, the multilayer film capacitor 100 has a portion where the gap 7 is larger than the case shown in FIG. Therefore, in the multilayer film capacitor 100 as shown in FIG. 6, the evaporated metal component of the fuse portion 6 is liquefied or solidified, and the divided electrode 2b or 3b in which the short circuit occurs is brought into conduction again with the metallicon portion 4 or 5. The possibility of becoming is further reduced. Therefore, the multilayer film capacitor 100 according to the second modification shown in FIG. 6 has higher reliability than the conventional one in terms of reuse after a short circuit even when the protrusions 2c _and 3c are not provided.

  FIG. 8 shows a third modification of the first embodiment. So far, the description has been given of the case where the positions of the fuse portions 6 on the respective laminated surfaces are aligned every other layer or continuously in all layers, but it is not always necessary to cover all layers. In FIG. 8, the positions of the fuse portions 6 on each stacked surface are aligned every other block 1 and block 2 each consisting of a plurality of continuous layers, but are not necessarily between the block 1 and the block 2. An example is shown that they are not complete. Further, only the block 1 or the block 2 may be provided so that the positions of the fuse portions 4 on each laminated surface are arranged every other layer. Furthermore, as described with reference to FIGS. 6 and 7, not all the layers but all layers within the corresponding block may be aligned and may not be aligned with other blocks.

  Even in the multilayer film capacitor 100 formed in this way, the gap 7 is larger than the conventional one in the block where the positions of the fuse portions 6 on the laminated surface are aligned. Therefore, this multilayer film capacitor 100 can also achieve the effects described so far.

  FIG. 9 shows a capacitor module 200 formed using the laminated film capacitor 100. In FIG. 9A, the first external electrode 8 and the second external electrode 9 are drawn with the metallicon parts 4 and 5 of the multilayer film capacitor 100 (the metallicon part 5 being hidden on the lower surface of the drawing). 2 is a perspective view of the multilayer film capacitor 100 attached so as to be in contact with The first external electrode 8 includes a first external electrode terminal 8a at one end portion, and the second external electrode 9 includes a second external electrode terminal 9a at one end portion. The first external electrode terminal 8a and the second external electrode terminal 9a each have a mounting hole for a bus bar or the like. The first external electrode 8 and the second external electrode 9 are pressure-bonded to the multilayer film capacitor 100 through, for example, pressure bonding or a plating part (not shown). In FIG. 9A, the lamination direction of the first film and the second film of the multilayer film capacitor 100 is a direction indicated by an arrow. Assuming that the first internal electrode 2 of the first film 10 is located on the EE cross section, in FIG. 9A, only the first internal electrode 2 located on the EE cross section is indicated by a broken line. . The first internal electrode 2 is connected to the metallicon part 4 and is separated from the metallicon part 5. The second internal electrode 3 is arranged in the stacking direction via the dielectric film 1 in parallel with the illustrated first internal electrode 2 and is connected to the metallicon part 5. It is separated from the metallicon part 4. In FIG. 9A, the first internal electrodes 2 and the second internal electrodes 3 are alternately arranged in the stacking direction via the dielectric film 1 in this way.

  FIG. 9B shows a cross-sectional view of the capacitor module 200. The cross-sectional position corresponds to EE in FIG. The capacitor module 200 includes a laminated film capacitor 100 to which the first external electrode 8 and the second external electrode 9 are attached, a container 110 that houses the film capacitor, and a sealing material 120 that seals the inside of the container 110. Is provided. As described with reference to FIG. 9A, the first internal electrode 2 is located on the EE cross section, and is connected to the metallicon part 4. In FIG. 9B, the multilayer film capacitor 100, the first external electrode 8, the second external electrode 9, and the container 110 are not hatched for easy viewing. Metallicon parts 4 and 5 were painted black instead of hatching.

  The container 110 is made of an electrical insulating material such as various resins, and is a removable lid portion for housing the multilayer film capacitor 100 to which the first external electrode 8 and the second external electrode 9 are attached ( (Not shown) and slit-like holes (not shown) for exposing the respective distal end portions of the first external electrode terminal 8a and the second external electrode terminal 9a to the outside.

  The sealing material 120 fills the container 110, and fixes the multilayer film capacitor 100 to which the first external electrode 8 and the second external electrode 9 are attached in the container 110. The sealing material 120 also functions as a cushioning material for the multilayer film capacitor 100 when an impact is applied to the container 110 from the outside.

  FIG. 10A shows an example in which three laminated film capacitors 100a to 100c and a first external electrode 8 and a second external electrode 9 are provided on these. This is put in the container 110 as shown in FIG. 10 (b), and the tips of the first external electrode terminals 8a to 8c and the second external electrode terminals 9a to 9c are exposed outside the container 110 and sealed. Capacitor module 200 may be formed by filling container 110 with sealing material 120 and sealing. In FIG. 10B, the multilayer film capacitor 100b, the first external electrode 8, the second external electrode 9, and the container 110 are not hatched for easy viewing. Metallicon parts 4 and 5 were painted black instead of hatching.

  By using the multilayer film capacitor 100 as such a capacitor module 200, the multilayer film capacitor 100 can be protected from the outside in addition to the above-described effects related to the multilayer film capacitor 100. Furthermore, by providing the external terminal having the attachment hole, the multilayer film capacitor 100 can be easily attached to the circuit.

  FIG. 11 shows an example of a power conversion system 300 using the multilayer film capacitor 100 according to the first embodiment. A power conversion system 300 shown in FIG. 11 converts DC power from a DC power supply 310 into three-phase AC power, and supplies it to a motor 360 via a three-phase power supply line 350.

  The power conversion system 300 includes a DC power supply 310, a DC / DC converter 320, a DC link capacitor 330, and a three-phase inverter 340. The DC / DC converter 320 includes an input capacitor 321 and a voltage conversion circuit 322.

  The DC power supply 310 is, for example, a battery (secondary battery).

  When DC power is supplied from the DC power supply 310, the DC / DC converter 320 receives a DC voltage via the input capacitor 321, boosts it with the voltage conversion circuit 322, and outputs it. The input capacitor 321 is a smoothing capacitor for reducing a surge superimposed on the DC voltage supplied from the DC power supply 310, and includes the capacitor module 200.

  The boosted DC voltage that is the output of the DC / DC converter 320 is applied to the three-phase inverter 340 via the DC link capacitor 330. The DC link capacitor 330 is a smoothing capacitor for reducing a surge superimposed on the DC voltage output from the DC / DC converter 320, and is composed of the capacitor module 200. The three-phase inverter 340 converts the input DC power into three-phase AC power and outputs it. The output three-phase AC power is supplied to the motor 360 via the three-phase power supply line 350.

  On the other hand, when the three-phase inverter 340 receives the three-phase AC power generated with the rotation of the motor 360, the three-phase inverter 340 converts the input three-phase AC power into DC power and outputs the DC power to the DC link capacitor 330. DC link capacitor 330 reduces a surge superimposed on the DC voltage output from three-phase inverter 340.

  The DC / DC converter 320 steps down the DC voltage output from the DC link capacitor 330 by the voltage conversion circuit 322 and smoothes the stepped down DC voltage by the input capacitor 321. The DC / DC converter 320 supplies DC power to the DC power supply 310 to charge the DC power supply 310 that is a battery.

  As already described, the multilayer film capacitor 100 according to the first embodiment has higher reliability than conventional products. Therefore, the reliability of the power conversion system 300 can be improved by using the capacitor module 200 including the multilayer film capacitor 100 according to the first embodiment for the input capacitor 321 and the DC link capacitor 330.

DESCRIPTION OF SYMBOLS 1 Dielectric film 2 1st internal electrode 2a End part electrode 2b Split electrode 2c Protrusion part 3 2nd internal electrode 3a End part electrode 3b Split electrode 3c Protrusion part 4, 4a-4c Metallicon part (1st electrode)
5, 5a-5c Metallicon part (second electrode)
6 Fuse part 7 Air gap part 8 1st external electrode 8a-8c 1st external electrode terminal 9 2nd external electrode 9a-9c 2nd external electrode terminal 10 1st film 20 2nd film 100, 100a- 100c Multilayer film capacitor 110 Container 120 Sealing material 200 Capacitor module 300 Power conversion system 310 DC power supply 320 DC / DC converter 321 Input capacitor 322 Voltage conversion circuit 330 DC link capacitor 340 Three-phase inverter 350 Three-phase power supply line 360 Motor

Claims (4)

A first film in which a metal film is formed as a first internal electrode on a dielectric film and a second film in which a metal film is formed as a second internal electrode on the dielectric film are alternately laminated in a plurality of layers. A stacked body, a first electrode connected to the first internal electrode, and a second electrode connected to the second internal electrode,
At least one of the first internal electrode and the second internal electrode includes a fuse part that is a narrow part of a metal film having a narrower width than the other part of the metal film on the dielectric film surface. Type film capacitor,
The fuse part is aligned at least every other layer between the layers on the dielectric film surface,
The first internal electrode and the second internal electrode are:
Each of the fuse portions;
A dummy fuse portion formed of the metal film having the same shape as the fuse portion,
The dummy fuse portion is formed at a position where the position of the adjacent layer on the laminated surface is aligned with the fuse portion of the adjacent layer in a region where the metal film is not formed.
The position on the laminated surface of the fuse part is aligned with the position on the laminated surface of the fuse part or the dummy fuse part of the adjacent layer,
In at least a part of the plurality of layers that are continuous in the stacking direction, the fuse part is aligned with the fuse part of the other layer or the dummy fuse part on the stacking surface,
A multilayer film capacitor characterized by that. That the position is aligned between the layers, the displacement of the position of the fuse portion between the stacks is within three times the width of the narrow portion,
The multilayer film capacitor according to claim 1 , wherein: One or more laminated film capacitors according to claim 1 or 2 , and
A container for storing the one or more laminated film capacitors;
A first external electrode connected to the first electrode, a part of which is drawn out of the container;
A second external electrode connected to the second electrode, a part of which is drawn out of the container;
A sealing material filled in the container and sealing the multilayer film capacitor;
A capacitor module comprising: In a power conversion system that converts one of DC power and AC power into the other,
At least one of the multilayer film capacitor according to claim 1 or 2 and the capacitor module according to claim 3 is used as a smoothing capacitor for reducing a surge superimposed on a DC voltage.
A power conversion system characterized by that.

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