JP2021036551A - Caseless film capacitor - Google Patents

Abstract

To improve the quality of a current inflow and outflow mode, and to realize low inductance and low loss (heat generation suppression) while making it advantageous for larger size, larger capacity, and lighter weight.SOLUTION: In a capacitor element group 2, a plurality of capacitor elements 1 are arranged side by side in both the horizontal direction and the vertical direction. Vertical electrode plates 4aP, 4aN are connected to the entire first and second polar electrode surfaces 1aP, 1aN of the plurality of capacitor elements 1 in a capacitor element row 2a. In a plurality of capacitor units 71, 72 arranged side by side in parallel in the axial direction, first drawer terminals 5cP, 5cP, and second drawer terminals 5cN, 5cN are overlapped with each other, and the whole capacitor units are covered with a mold resin 8 except for the drawer terminals.SELECTED DRAWING: Figure 15

Description

The present invention relates to a caseless film capacitor in which the capacitance portion, which is the main portion of the capacitor, is covered with a mold resin without using an outer case.

In the field of power devices using SiC and the like in recent years, high-frequency operation is possible by reducing switching loss by high-speed switching operation. In this case, in order to improve the circuit characteristics, it is necessary to reduce the parasitic inductance of the circuit that restricts the switching speed, and the reduction of the inductance is also mentioned as a requirement for the capacitor performance. At the same time, it is required to increase the capacity of the capacitor and increase the high frequency and current.

JP-A-2019-4068 JP-A-2017-38065

Capacitors with large capacity, high frequency, and large current are connected so as to form a full bridge inverter, for example, but since the output voltage and output current fluctuate depending on the load conditions, the current flowing through the capacitor also has a path (part) and magnitude. Changes (current input / output to and from the capacitor, output terminal current, circulating current between UV phases). Therefore, it is necessary to suppress the current density of each part of the capacitor according to the current conditions.

The terminal shape of the capacitor requires a thin plate electrode type that can be directly attached to the semiconductor device, but in the past, there was only a capacitor housed in a case (see, for example, Patent Document 1) or a relatively small caseless type, which was sufficiently large. The capacity has not been increased. In addition, it is necessary to take measures such as increasing the plate thickness of the electrodes in order to suppress heat generation.

In order to cope with low inductance and high frequency large current at the same time, it is necessary to shorten the electrode length as much as possible and increase the cross-sectional area by the overlapping structure of thin plate electrodes, but there is a limit with only a single capacitor unit (for example, Patent Document 2). reference).

The present invention was created in view of such circumstances, and it is possible to realize low inductance and low loss (heat generation suppression) while increasing the size, capacity, and weight of the caseless film capacitor. The purpose is to.

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

The caseless film capacitor according to the present invention
A plurality of capacitor elements are arranged side by side in the horizontal and vertical directions in a state where the electrode surfaces of the first polarity and the second polarity at both ends in the axial direction are positioned on the same plane, respectively, to form a capacitor element group.
The electrode surfaces of the first polarity of each of the plurality of capacitor elements are connected to each other via a first overhead electrode plate, and the electrode surfaces of the second polarity of each of the plurality of capacitor elements are second to each other. Connected via the overhead electrode plate of
The first overhead electrode plate has a first horizontally long terminal plate connected to its upper end, and the second overhead electrode plate has a second horizontally long terminal plate connected to its upper end.
The first lead-out terminal of the first polarity extends from the upper end edge of the first horizontally long terminal plate portion, and the second drawer terminal of the second polarity extends from the upper end edge of the second horizontally long terminal plate portion. Equipped with at least a pair of capacitor units
The pair of capacitor units are arranged side by side in a state where the axial directions of the respective capacitor elements are parallel.
In the pair of capacitor units, the first drawer terminals having the same polarity are overlapped with each other, and the second drawer terminals having the same polarity with each other are overlapped with each other.
Except for the first and second drawer terminals that are overlapped with each other, the entire surface is covered with a mold resin.

In the above configuration, a plurality of capacitor elements are arranged side by side in the entire caseless film capacitor in both the horizontal direction and the vertical direction orthogonal to the axial direction of the capacitor element, and a plurality of pieces are arranged side by side in the axial direction as well. Therefore, since a plurality of them are juxtaposed in each of the three-dimensional directions as a whole, the capacity can be increased as compared with the case where they are juxtaposed only in the one-dimensional direction or in the two-dimensional direction.

Both the first drawer terminal and the second drawer terminal are overlapped by the number of capacitor units, and this is a horizontally long terminal plate portion that relays between the first drawer terminal and the first overhead electrode plate. As a first horizontally long terminal plate portion, and as a terminal plate portion that relays between the second drawer terminal and the second overhead electrode plate, this is horizontally elongated and the second horizontally long terminal plate portion is used. It is supposed to be. That is, by increasing the cross-sectional area of the current input / output, it becomes possible to facilitate the flow of current, reduce the inductance of the current line by suppressing the current density, and accordingly, it is possible to reduce the loss and suppress heat generation.

The caseless film capacitor of the present invention having the above configuration has several preferable modes or changes / deformation modes as follows.

[1] While a plurality of the first drawer terminals are drawn out from a plurality of locations separated by a predetermined interval on the upper end edge of the first horizontally long terminal plate portion, the second drawer terminal is the second horizontally long terminal plate portion. Multiple drawers from multiple locations at predetermined intervals on the upper edge of the
The first drawer terminal and the second drawer terminal are arranged alternately so as to be displaced in the longitudinal direction of the horizontally elongated terminal plate portion, and the second drawer terminal is located between a pair of adjacent first drawer terminals. There is an embodiment in which the drawer terminal is located and the first drawer terminal is located between the pair of adjacent second drawer terminals.

Since the lead terminals of the first polarity and the second polarity are staggered and arranged alternately, it is possible to make the current input / output path uniform and prevent the current from concentrating.

[2] The first overhead electrode plate is provided according to the number of rows of the capacitor elements arranged in the horizontal direction, and a plurality of rows of first vertical frames connecting the electrode surfaces of the capacitor elements arranged in the vertical direction. There is an embodiment in which the electrode plate has an electrode plate and a first horizontal electrode plate that connects the first vertical electrode plates in a plurality of rows in the lateral direction.

The form of connection between the capacitor element group and the first overhead electrode plate is an individual connection of the strip-shaped first vertical electrode plate to each capacitor element in one row of capacitor element rows. Rather than connecting with a single electrode plate developed in a large area state over the entire capacitor element group, a strip-shaped equivalent of a single electrode plate developed in a large area state divided into a plurality of pieces. Since the first vertical electrode plate is connected as a unit, even if the area increase is considerably large due to the increase in capacity, deformation such as unevenness and waviness of the electrode plate is suppressed. , It is possible to improve the connection quality between the capacitor element (group) and the first overhead electrode plate. At the same time, weight reduction and cost reduction can be achieved.

In this case, as can be seen from the configuration described above, since the first vertical electrode plates in the plurality of rows are integrated via the first horizontally long terminal plate portion, the first vertical electrode plates in one row and one row are integrated. Even if the plate is very thin, the strength can be increased and the posture can be stabilized.

[3] The second overhead electrode plate is provided according to the number of rows of the capacitor elements arranged in the horizontal direction, and a second vertical frame having a plurality of rows connecting the electrode surfaces of the capacitor elements arranged in the vertical direction. There is an embodiment in which the electrode plate has an electrode plate and a second horizontal electrode plate that connects the plurality of rows of the second vertical electrode plates in the lateral direction.

The form of connection between the capacitor element group and the second overhead electrode plate is an individual connection of the strip-shaped second vertical electrode plate to each capacitor element in one row of capacitor element rows. Rather than connecting with a single electrode plate developed in a large area state over the entire capacitor element group, a strip-shaped equivalent of a single electrode plate developed in a large area state divided into a plurality of pieces. Since the second vertical electrode plate is connected as a unit, even if the area increase is considerably large due to the increase in capacity, deformation such as unevenness and waviness of the electrode plate is suppressed. , It is possible to improve the connection quality between the capacitor element (group) and the second overhead electrode plate. At the same time, weight reduction and cost reduction can be achieved.

[4] Regarding the pair of inwardly opposed overhead electrode plates and the pair of outwardly opposed overhead electrode plates in the pair of capacitor units.
The upper end of the inwardly opposed overhead electrode plate has an extension portion extending upward from the capacitor element at the uppermost stage of the capacitor element group, and is connected via the extension portion. The horizontally long terminal plate portion is composed of a rising plate portion connected to the extending portion in a state of extending further upward.
The horizontally long terminal plate portion connected to the upper end portion of the outward facing overhead electrode plate is a horizontal posture plate portion arranged in a horizontal posture along the uppermost surface portion immediately above the uppermost surface portion of the capacitor element group. And the rising plate part that is bent and extended upward from the inner end part of this horizontal posture plate part.
There is an embodiment in which the upper end portion of the outward facing overhead electrode plate is connected to the horizontal posture plate portion.

Regarding the mode of connecting the horizontally long terminal plate portion to the inwardly facing overhead electrode plate, an upward extending portion is provided at the upper end portion of the inwardly opposed overhead electrode plate, while the horizontally long terminal plate portion is composed of a rising plate portion. By doing so, the arrangement posture of the inwardly opposed overhead electrode plate, the extending portion, and the horizontally long terminal plate portion (rising plate portion) is such that the electrode surface is arranged on a plane extending upward. That is, it is possible to make the unfolded posture substantially straight from the electrode surface. In the case of a substantially straight unfolded posture, the current path length is shorter than that of the bent unfolded posture, which also has an advantage in reducing inductance and loss (heat generation suppression).

[5] Regarding the polar relationship between the pair of inwardly opposed overhead electrode plates, the polar electrode plates having the same polarity may be used, or the overhead electrode plates having different polarities may be used.

In the case of overhead electrode plates having the same polarity, both may be N pole (negative electrode) and both may be P pole (positive electrode). In the case of overhead electrode plates having different polarities, the combination of N poles and P poles (NP) or the combination of P poles and N poles (PN) may be arranged in an array.

[6] The first drawer terminal and the second drawer terminal are arranged at substantially the same height position in the vertical direction. According to this configuration, it is possible to reduce the bulk (compactification) of the caseless film capacitor as compared with the case where the height must be different.

[7] There is an embodiment in which the superposition position of the first drawer terminals and the superposition position of the second drawer terminals are the center positions of the entire axial width of the pair of capacitor units. ..

Since this is a symmetrical arrangement structure, it has an advantage in equalizing the current flow. Further, in the configuration at the center position of [7], the structure of the horizontally long terminal plate portion extending the plurality of drawer terminals is likely to be the same for the first-polarity one and the second-polarity one. When the number of parallel capacitor units is even, the center position of the total axial width of the plurality of capacitor units arranged side by side is the inward facing position between the adjacent electrode surfaces.

[8] There is an embodiment in which at least one of the first overhead electrode plate and the second overhead electrode plate is in the shape of a thin plate and is formed of a single electrode plate.

According to this configuration, the weight and cost tend to increase as compared with the case of [3] above, but a relatively large area is secured as the cross-sectional area of the current passage, and the inductance and loss are reduced (heat generation suppression). ) Is more advantageous.

A cutout hole is formed so as to correspond to the electrode surface of each capacitor element, and a small projecting piece for connection extending from the hole edge to the inside of the cutout hole is projected, and the small projecting piece for connection is formed at the portion of the small projecting piece for connection. If it is electrically and mechanically connected to the electrode surface by soldering or the like, it is possible to connect in a state of avoiding the influence of deformation such as unevenness and waviness.

[9] The overhead electrode plate and the horizontally long terminal plate portion of at least one of the first overhead electrode plate and the second overhead electrode plate formed of the thin plate-shaped single electrode plate. And the whole of the drawer terminal is made of a single conductive plate.

One drawer bus bar (overhead electrode plate, horizontally long terminal plate, and entire drawer terminal) including the overhead electrode plate, the horizontally long terminal plate on the upper end side of the overhead electrode plate, and the drawer terminal protruding from the horizontally long terminal plate. It can be efficiently manufactured by sheet metal processing or press processing based on the conductive plate of an object.

According to the present invention, since a plurality of capacitor elements are arranged side by side in each of the three-dimensional directions, it is possible to increase the capacity. Further, both the first drawer terminal and the second drawer terminal are overlapped by the number of units, and the terminal plate portion that relays between the drawer terminal and the overhead electrode plate is used as a horizontally long terminal plate portion to cut off current input / output. Since the area is increased, low inductance and low loss (heat generation suppression) can be realized.

A perspective view showing a first horizontally long terminal plate portion of the first polarity in the caseless film capacitor of the embodiment of the present invention. A perspective view showing a state in which a plurality of vertical electrode plates are connected to a first horizontally long terminal plate portion in an embodiment of the present invention. A perspective view showing a state in which the structure of FIG. 2 is attached to the capacitor element group in the embodiment of the present invention. A perspective view showing a state in which a first horizontal electrode plate having the first polarity is attached to the structure shown in FIG. 3 in an embodiment of the present invention. A perspective view showing a state in which a sheet-shaped insulating material is attached to the structure shown in FIG. 4 in the embodiment of the present invention. A perspective view showing a second horizontally long terminal plate portion of the second polarity in the embodiment of the present invention. A perspective view showing a state in which a plurality of second vertical electrode plates having a second polarity are attached to the structure shown in FIG. 6 in the embodiment of the present invention. A perspective view showing a state in which the structure of FIG. 7 having a sheet-shaped insulating material attached to the capacitor element group in the embodiment of the present invention is arranged so as to face each other. A perspective view showing a state in which a structure in which a second horizontally long terminal plate portion and a plurality of rows of second vertical electrode plates in an embodiment of the present invention are integrated is brought into close contact with a capacitor element group and then connected. A perspective view showing a state in which the second horizontal electrode plate is attached to the structure shown in FIG. 9 in the embodiment of the present invention. A perspective view showing a state in which the first capacitor unit and the second capacitor unit in the embodiment of the present invention are separated from each other. A perspective view showing a state in which the first capacitor unit and the second capacitor unit in the embodiment of the present invention are butted and arranged side by side. Perspective view showing the appearance of the finished product of the caseless film capacitor in the Example of the present invention. Front view and rear view showing the structure of the main part (overlapping drawer terminal part) in the embodiment of the present invention in an enlarged manner. A perspective view showing an enlarged structure of a main part (overlapping drawer terminal part) in the embodiment of the present invention. A perspective view showing an enlarged structure of a main part (overlapping drawer terminal part) in the embodiment of the present invention. Front view and rear view showing an enlarged structure of a main part (overlapping drawer terminal part) in another embodiment of the present invention. Perspective view showing the first capacitor unit in still another embodiment of the present invention. A perspective view and an enlarged perspective view of a main part showing the internal structure (main part of the capacitor) of the caseless film capacitor in the embodiment corresponding to FIG. 18 of the present invention. Enlarged front view of the main part in the embodiment corresponding to FIG. 18 of the present invention.

Hereinafter, embodiments of the caseless film capacitor of the present invention having the above configuration will be described in detail at the level of specific examples.

FIG. 13 shows the appearance of the finished product of the caseless film capacitor. Reference numeral 8 denotes a mold resin as a protective material that covers almost the entire main portion of the capacitor except for the drawer terminal portion. From the upper end surface of the mold resin 8, a plurality of first superposed drawer terminal portions 5 k _P and a plurality of second superposed drawer terminal portions 5 k _N are arranged alternately with their positions shifted in the longitudinal direction.

FIG. 12 shows the main part of the capacitor coated on the mold resin 8 of FIG. 13 taken out. This main part has a form in which the first capacitor unit 7 ₁ on the back side of the paper and the second capacitor unit 7 ₂ on the front side face each other.

FIG. 11 shows a state in which the first capacitor unit 7 ₁ and the second capacitor unit 7 ₂ are separated from each other. The first capacitor unit 7 ₁ and the second capacitor unit 7 ₂ have the same basic structure.

Figure 10 shows the first appearance of the capacitor unit _71. 2 is a group of capacitor elements, 4 _N on the front side is a second polarity second electrode plate (lattice), and 5 _N is a second horizontally long terminal plate, which is horizontally long with the second electrode plate 4 _N. A second bus bar 3 _N having a second polarity is formed by the terminal plate portion 5 _N. The second overhead electrode plate 4 _N is composed of a vertical and horizontal lattice body consisting of a plurality of rows of second vertical electrode plates 4a _N and a plurality of rows of second horizontal electrode plates 4b _N. Although not shown, the first polar bus bar (3 _P ) is arranged on the back side in a symmetrical state with the second overhead electrode plate 4 _N on the front side (details will be described later). ).

6 to 9 show the configuration of _{the second bus bar 3 N} arranged on the front side (inside between the pair of capacitor units in FIG. 12) in FIG. 10. Figures 1-5 show the construction of the first busbar 3 _P which is disposed on the back side in FIG. 10. Regarding the angles at which individual parts and structures are visually recognized, FIGS. 1 to 5 are different from FIGS. 10 to 13, and FIGS. 6 to 9 are the same as those of FIGS. 10 to 13. Hereinafter, they will be described in order.

Figure 1 shows a first oblong terminal plate 5 _P. The first horizontally long terminal plate portion 5 _P is also shown in FIGS. 2 to 5 and 8. The first horizontal terminal plate 5 _P includes a startup plate portion 5a _P, the start-up plate portion 5a _P angle from extending out the horizontal posture plate portion 5b _P bent from the lower end L-shaped cross section of the At the upper end edge of the rising plate portion 5a _P, a small tongue piece-shaped first lead-out terminal 5c _P of the first polarity is further extended upward from a plurality of locations separated by a predetermined interval. ing. Note that 5c _P1 is a terminal inclined portion and 5c _P2 is a terminal vertical portion (details will be described later in FIGS. 14 to 16).

FIG. 2 shows a state in which a plurality of first vertical electrode plates 4a _P having the first polarity are connected to the first horizontally long terminal plate portion 5 _P. The first vertical electrode plate 4a _P has a strip shape, and its upper end is bent in a horizontal posture. In a posture in which the first vertical electrode plates 4a _{P in a} plurality of rows are parallel to each other, electrical and mechanical by spot welding or the like with respect to the vertical surface of the first horizontally long terminal plate portion 5 _{P at the horizontally bent portion at the upper end.} It is connected to the. The first vertical electrode plate 4a _P may be configured by superimposing two copper plates from the viewpoint of improving connectivity and increasing current paths to reduce heat generation.

FIG. 3 shows a state in which the structure of FIG. 2 is attached to the capacitor element group 2. 1 is a capacitor element, 1a _P is an electrode surface of the first polarity, 1a _N is an electrode surface of the second polarity, 2 is a capacitor element group, and 2a is a capacitor element array.

The capacitor element 1 has an oval cross-sectional shape and is configured as a flat columnar body, and the capacitor element group 2 is configured such that a plurality of capacitor elements 1 are arranged side by side not only in the horizontal direction but also in the vertical direction. In the capacitor element group 2, a plurality of capacitor elements are provided so that the electrode surfaces 1a _P of the first polarity and the electrode surfaces 1a _N of the second polarity at both ends in the axial direction of the capacitor element 1 are positioned on the same plane in the vertical direction. 1s are arranged side by side in the vertical and horizontal two-dimensional directions. The plurality of capacitor elements 1 are arranged side by side in the same posture as each other, with their axial directions oriented in the same direction (in a state of being parallel to each other), and in a state where adjacent ones are in contact with each other. In the capacitor element group 2, the outer envelope surface has a substantially rectangular parallelepiped shape in which the vertical and horizontal dimensions are larger than the relatively small depth dimension. As the first vertical electrode plate 4a _P described in FIG. 2, a plurality of the same number as the number of the capacitor elements 1 in parallel in the horizontal direction are prepared.

In the case of the illustrated example, the number of the capacitor elements 1 constituting the capacitor element group 2 is 54 in total, 9 columns in the horizontal direction and 6 rows in the vertical direction. However, this is an example, and the number of columns and the number of rows may be any plurality.

One row of a plurality of capacitor elements 1 arranged side by side in the vertical direction constitutes a capacitor element row 2a, and the entire _{electrode surface 1a P of the first polarity with respect to the capacitor element row 2a for this one row.} The first vertical electrode plate 4a _P is electrically and mechanically connected by soldering or the like, and such a connection is made to all the capacitor element rows 2a for the plurality of rows constituting the capacitor element group 2. ing.

A plurality of rows of first vertical electrode plates 4a _{P in} the first overhead electrode plate 4 _P (FIG. 4) are connected to _{the electrode surface 1a P} of the first polarity of the capacitor element group 2. In this connection, a horizontal posture plate portion 5b _P in the first horizontal terminal plate 5 _P are arranged in a horizontal position along its top surface portion immediately above the uppermost surface portion of the envelope surface of the capacitor element group 2.

FIG. 4 shows a state in which the first horizontal electrode plate 4b _P of the first polarity is attached to the structure shown in FIG. A plurality of rows, all of the first horizontal bridging electrode plate 4b _P multiline mutually parallel to the first vertical rack electrode plate 4a _P are electrically and mechanically connected by soldering or the like, first Tateka electrode plate 4a _P and the first rack electrode plate 4 _P lattice-like structure in a first horizontal bridging electrode plate 4b _P is built. The first bus bar 3 _P is composed of the first overhead electrode plate 4 _P and the first horizontally long terminal plate portion 5 _{P having a lattice-like structure.} The first bus bar 3 _P constitutes an external connection terminal structure drawn from _{the electrode surface 1a P} group of the first polarity of the capacitor element group 2.

FIG. 5 shows a state in which a sheet-shaped insulating material 6 _{P is attached to the structure shown in FIG.} Those against startup plate portion 5a _P of the first horizontal terminal plate 5 _P, the suffix of the sheet-like insulating material 6 _P over both sides are coated ( "6 _P" indicating a first polarity is not it.). Regarding the insulating material 6 _P , the back surface side is covered in a continuous state over almost the entire length, and the front surface side is covered with the _{exception of the portion corresponding to the first drawer terminal 5 c P} , that is, the adjacent drawer terminals. 5c _P, between partial and do 5c _P, and has a coating of non-contiguous discrete state spaced. In the sheet-shaped insulating material 6 _P , the back surface side portion and the front surface side portion are connected in a series. For example, it is a form in which a plurality of divided comb teeth in a comb are bent 180 degrees from the upper side of the drawing. The sheet-shaped insulating material 6 _P is in close contact with the front surface and the back surface of the rising plate portion 5a _{P in a close contact state with no gap.}

FIG. 6 shows the second horizontally long terminal plate portion 5 _N. The second horizontally long terminal plate portion 5 _N is also displayed in FIGS. 7 to 10. Unlike the first horizontally long terminal plate portion 5 _P shown in FIG. 1, the second horizontally long terminal plate portion 5 _N does not have a horizontal posture plate portion, and the main body is a rising plate portion, and the standing plate portion thereof is used. On the upper end edge of the raised plate portion, a second drawer terminal 5c _{N in the} shape of a small tongue is extended further upward from a plurality of locations separated by a predetermined interval.

FIG. 7 shows a state in which a plurality of second vertical electrode plates 4a _N of the second polarity are connected to the second horizontally long terminal plate portion 5 _N. The second vertical electrode plate 4a _N has a strip shape, and its upper end portion maintains a substantially straight vertical surface without being bent horizontally. A plurality of the second vertical electrode plates 4a _{N, which} are the same as the number of the capacitor elements 1 in parallel, are prepared, and are arranged in parallel in a vertical direction with a predetermined interval from each other. A plurality of rows of second vertical electrode plates 4a _N are electrically and mechanically connected to the vertical surface of the second horizontally long terminal plate portion 5 _{N at} the vertical surface portion of the upper end portion by spot welding or the like.

When connecting the upper end of the second vertical rack electrode plate 4a _N a (vertical surface) to the second oblong terminal plate 5 _N, the upper end portion of the second vertical rack electrode plate 4a _N (vertical surface) _{Has an extension portion 4a 1N} extending upward from the uppermost capacitor element 1 of the capacitor element group 2. The second horizontally long terminal plate portion 5 _N is connected to the second horizontally long terminal plate portion 5 _N via the extended portion 4a _1N (see FIG. 14). In addition, in order to avoid complication of the drawing, the insulating materials 6 _N and 6 _P are omitted in FIG.

FIG. 9 shows a state in which the structure of FIG. 7 is attached to the capacitor element group 2. This is a state in which the structure shown in FIG. 5 is rotated clockwise by about 120 degrees, and then the structures shown in FIG. 7 are substantially parallel to each other and face each other. Note that FIG. 8 shows a state before mounting (separated state).

As shown in FIG. 9, the second vertical electrode plate 4a _N is electrically and mechanically attached to the capacitor element row 2a for one row _{over the entire electrode surface 1a N of the second polarity by soldering or the like.} It is connected, and such a connection is made to all the capacitor element rows 2a for the plurality of rows constituting the capacitor element group 2.

In this connection, the plurality of second lead terminals 5c _N in a plurality of first oblong terminal plate 5 _P first lead terminal 5c _P and the second oblong terminal plate 5 _N, Horizontal terminal plate portions The first drawer terminal 5c _P and the second drawer terminal 5c _N are arranged at substantially the same height position in the vertical direction. A pair of adjacent first lead terminal 5c _P, 5c second lead terminals 5c _N is located between _P, the pair of adjacent second lead terminals 5c _N, the first lead-out terminals 5c _P between 5c _N Is located.

FIG. 10 shows a state in which the second horizontal electrode plate 4b _N of the second polarity is attached to the structure shown in FIG. A plurality of rows every second horizontal bridging electrode plate 4b _N multiline parallel to each other with respect to the second vertical rack electrode plate 4a _N are electrically and mechanically connected by soldering or the like, the second Tateka electrode plate 4a _N and the second rack electrode plate 4 _N lattice-like structure in a second horizontal bridging electrode plate 4b _N are constructed. A second bus bar 3 _N is composed of a second overhead electrode plate 4 _N having a lattice-like structure and a second horizontally long terminal plate portion 5 _N. The second bus bar 3 _N constitutes an external connection terminal structure drawn from the second polar electrode surface 1a _{N group of the capacitor element group 2.}

The second bus bar 3 _N , in which the second overhead electrode plate 4 _N and the second horizontally long terminal plate portion 5 _N are integrated, has a form in which almost the entire portion is developed in one plane. ing. The second vertical electrode plate 4a _N is electrically and mechanically connected to the vertical surface of the second horizontally long terminal plate portion 5 _N by spot welding or the like at the vertical surface of the upper end portion thereof. Then, a plurality of rows of second vertical electrode plates 4a _N are electrically and mechanically connected to the second polar electrode surfaces 1a _N of the capacitor element group 2 by soldering or the like.

Regarding the arrangement posture of the second vertical electrode plate 4a _{N in a plurality of rows and the second horizontally long terminal plate portion 5 N} to which the upper end portions thereof are connected _{, these are the electrode surfaces 1a N} of the second polarity of the capacitor element group 2. It is located on the upward extension surface of. That is, the unfolded postures of the second vertical electrode plate 4a _N and the second horizontally long terminal plate portion 5 _N are vertical facing postures extending substantially straight from the _{electrode surface 1a N.}

Further, a second vertical electrode plate 4a _N is connected to the capacitor element row 2a for one row _{over the entire electrode surface 1a N} of the second polarity, and such connection is made for all capacitors for a plurality of rows. This is done for the element train 2a.

The second horizontally long terminal plate portion 5 _N whose main body is the rising plate portion is also covered with a sheet-like insulating material 6 _{N on both the front and back surfaces (the suffix of "6 N} " is the second polarity. The aspect of the sheet-shaped insulating material 6 _N is in addition to the aspect of the sheet-shaped insulating material 6 _P with respect to the rising plate portion 5a _{P of the first horizontally long terminal plate portion 5 P described above.} Therefore, it has a horizontal sheet portion 6 _N1 inserted in the gap between the uppermost surface portion of the capacitor element group 2 and the horizontal posture plate portion 5b _{P in the first horizontally long terminal plate portion 5 P.}

A sheet-shaped insulating material 6 _N attached to the structure of FIG. 10 is shown on the back side (left side) of FIG. Or by ₁ constitute a first capacitor unit 7.

As shown in FIG. 11, a second capacitor unit 7 ₂ having a _{similar structure is made to face the first capacitor unit 71 1.} In this two capacitor units 7 _1, 7 ₂ facing state, component group according to the second polarity (the suffix _"N" reference) and inwardly facing, component group according to the second polarity (the suffix _"P" reference) Is facing outwards.

Hereinafter, the first drawer terminal 5c _P and the second drawer terminal 5c _N will be described.

FIG. 15 is an enlarged view of the main part of FIG. 12 when viewed from the front side, and corresponds to FIG. 14 (a). FIG. 16 is an enlarged view of the main part of FIG. 12 when viewed from the back side, and corresponds to FIG. 14 (b). Figure 14 "7 _1" on the left side of (a) corresponds to _"71" on the right side in FIG. 14 (b), "7 _2" on the right side of FIG. 14 (a) is 14 (b) located on the left side of the corresponding "7 _2" (mirror image relationship).

_{A plurality of small tongue-shaped first drawer terminals 5c P} are extended upward from a plurality of locations at predetermined intervals on the upper end edges of the rising plate portion 5a _P of the first horizontally long terminal plate portion 5 _P. ing. _{Similarly, a plurality of small tongue-shaped second drawer terminals 5c N} are directed further upward from a plurality of locations at predetermined intervals on the upper end edges of _{the second horizontally long terminal plate portion 5 N} having the main body as the rising plate portion. Has been postponed. The number of the first drawer terminals 5c _{P and} the number of the second drawer terminals 5c _N are the same, and _{the distance between the first drawer terminal 5c P} and the second drawer terminal 5c _N is the same. There is.

One capacitor unit 7 is configured with the above configuration. Here, the above description of the capacitor unit 7 will be organized.

A plurality of capacitor elements 1 are arranged side by side in both the vertical and horizontal directions to form a capacitor element group 2. _{The first bus bar 3 P} refracted in a crank shape with respect to _{the electrode surface 1 a P} of the first polarity of the capacitor element group 2 and the second flat bus bar 3 _N are electrically and mechanically connected.

The crank-shaped first bus bar 3 _P is composed of a first horizontally long terminal plate portion 5 _P , a first vertical electrode plate 4a _P, and a first horizontal electrode plate 4b _P , respectively. The first vertical electrode plate 4a _P and the first horizontal electrode plate 4b _P are connected in a grid pattern. First rack electrode plate 4 _P has an upper end portion of the first vertical rack electrode plate 4a _P is connected to the first horizontal terminal plate 5 _P. A first vertical electrode plate 4a _P is connected to the electrode surface 1a _P. Horizontal orientation plate portion 5b _P in the first horizontal terminal plate 5 _P are arranged in a horizontal position along its top surface portion immediately above the uppermost surface of the capacitor element group 2. _{A sheet-shaped insulating material 6 P} is coated on both the front and back surfaces of the rising plate portion 5 a _P of the first horizontally long terminal plate portion 5 _P.

The flat second bus bar 3 _N is composed of a second horizontally elongated terminal plate portion 5 _N , a second vertical electrode plate 4a _N, and a second horizontal electrode plate 4b _N , respectively. The second vertical electrode plate 4a _N and the second horizontal electrode plate 4b _N are connected in a grid pattern. Second rack electrode plate 4 _N has an upper end portion of the second vertical rack electrode plate 4a _N is connected to the second oblong terminal plate 5 _N. A second vertical electrode plate 4a _N is connected to the electrode surface 1a _{N. A sheet-shaped insulating material 6 N} is coated on both the front and back surfaces of the second horizontally long terminal plate portion 5 _{N whose main body is the rising plate portion.}
The sheet-like insulating material 6 _N extends in the gap between the horizontal posture plate portion 5b _P in the uppermost surface portion of the first horizontal terminal plate 5 _P of the capacitor element group 2.

The plurality of first drawer terminals 5c _P and the plurality of second drawer terminals 5c _N are at the same height position and are arranged alternately with different positions in the lateral direction. A pair of adjacent first lead terminal 5c _P, 5c second lead terminals 5c _N is located between _P, the pair of adjacent second lead terminals 5c _N, the first lead-out terminals 5c _P between 5c _N Is located.

The caseless film capacitor of this embodiment includes at least a pair of capacitor units 7 configured as described above. Here, an embodiment in the case of forming a pair of caseless film capacitors by using two capacitor units 7 will be described. The two capacitor units 7 are referred to as a first capacitor unit 7 ₁ and a second capacitor unit 7 ₂ . It should be noted that the "first" and "second" attached before the "capacitor unit" do not specify the polarity (first polarity, second polarity) unlike the others.

As shown in FIGS. 10 to 16, a first capacitor unit ₇₁ in the second oblong terminal plate 5 _N and the second oblong terminal plate 5 _N in the second capacitor unit 7 ₂ directly confronts in face-to-face state, and in face-to-face state and the lattice-shaped second rack electrode plate 4 _N lattice-shaped second rack electrode plate 4 _N directly facing, first capacitor unit 7 ₁ and the second A capacitor unit 7 ₂ is installed side by side. _{Regarding the relationship between the axial direction of the plurality of capacitor elements 1} in the first capacitor unit 7 1 and the axial direction of the plurality of capacitor elements 1 in the second capacitor unit 7 ₂ , if one of the axial directions is extended, the extension thereof. The arrangement is such that the other axial directions coincide with each other on the line.

In a first capacitor unit 7 ₁ and the second capacitor unit 7 ₂ Prefecture, a first lead terminal 5c _P in the first lead-out terminals 5c _P and the second capacitor unit 7 ₂ in the first capacitor unit 7 ₁ It is superimposed, and the second lead terminal 5c of the first capacitor unit 7 _{1 N} and the second lead terminals 5c _N of the second capacitor unit 7 ₂ are superimposed. That is, the first drawer terminals 5c _P and 5c _{P having the} same polarity are overlapped with each other, and the second drawer terminals 5c _N and 5c _{N having the} same polarity are overlapped with each other. Here, the superposition of the drawer terminals means that they are in close contact with each other without a gap and are integrated as an electric conductor.

The superposition position of the first drawer terminals 5c _P and 5c _P and the superposition position of the second drawer terminals 5c _N and 5c _N are the axial directions of a pair of capacitor units 7 ₁ and 7 _{1 arranged side by side.} It is in the center position of the entire width (see especially FIG. 14).

The first lead terminal 5c _P, 5c _P How to overlay position and the second lead terminals 5c _N, the superposition positions and how 5c _N, in a pair of capacitor units are juxtaposed 7 _1, 7 ₁ Adjacent vertical / horizontal electrode plates (second-polarity vertical / horizontal electrode plates (4a _N , 4b _N )-(4a _N , 4b _N )) are facing each other (especially). See FIG. 14).

In order to regulate the mutual positional relationship between the first capacitor unit 7 ₁ and the second capacitor unit 7 ₂ facing each other in a stable manner, the first horizontal electrode plate of the first _{capacitor unit 7 1 is used.} A spacer (not shown) is attached to _{4b P.} By bringing this spacer into contact with the second horizontal electrode plate 4b _N of the second capacitor unit 7 _{2 on the other side, the vertical axis of the first} capacitor unit 7 1 and the second capacitor unit 7 ₂ The vertical axis is exactly parallel.

The explanation goes back and forth, but in the _{posture where the first capacitor unit 7 1} and the second capacitor unit 7 ₂ are in parallel contact with each _{other, the facing gaps of both capacitor units 7 1} and 7 ₂ are the same from the upper end to the lower end. The first drawer terminals 5c _P and 5c _P are refracted so as to be. That is, as shown in FIGS. 14 to 16, _{the terminal inclined portions 5c P1} and 5c _P1 refracted diagonally upward and inward from the root portion of _{the first drawer terminals 5c P} and 5c _P , and further refracted vertically upward. It has the terminal vertical portions 5c _P2 and 5c _P2 , but the terminal vertical portions 5c _P2 and 5c _P2 are in close contact with each other without a gap. The second drawer terminals 5c _N and 5c _N are also refracted in the same manner. That is, the second lead terminal 5c _N, terminal inclined portion 5c which is refracted from the base portion obliquely upward inward in 5c _{N N1,} and 5c _N1, further terminal vertical portion 5c which is refracted toward the vertical upward _N2, 5c _N2 However, the vertical terminals 5c _N2 and 5c _N2 are in close contact with each other without any gaps.

At the most advanced (top end), the vertical terminals 5c _P2 and 5c _{P2 of} the first polarity are overlapped to form the first superposed drawer terminal part 5k _{P of} the first polarity, and similarly at the most advanced (top end). The vertical terminals 5c _N2 and 5c _{N2 of} the second polarity are overlapped with each other to form the second overlapping drawer terminal portion 5k _{N of} the second polarity. The first superposed drawer terminal portion 5 k _P and the second superposed drawer terminal portion 5 k _N are staggered in a straight line and are arranged alternately, and a pair of adjacent first superposed drawer terminals are arranged. _{The second overlapping drawer terminal portion 5k N} is located between the portions 5k _P and 5k _P, and the first overlapping drawer terminal portion 5k N is located between the pair of adjacent second overlapping drawer terminal portions 5k _N and 5k _{N. P} is located.

A hanging jig (hanger) for resin molding is attached to the row portions of the first and second overlapping drawer terminal portions 5 k _P and 5 k _N. The attachment is pinching (pinching).

_{A molded product in which two} capacitor units 7 ₁ and 7 2 are faced to each other and a hanging jig is set is housed in a molding die having an upper opening, and the hanging jig is supported by the molding die. A spacer (not shown) is attached to the molded product in advance so as to contact the inner peripheral surface of the molding die and hold the posture of the molded product correctly. A caseless film capacitor is obtained by injecting and filling a molding resin 8 such as an epoxy resin into a molding die, and then releasing and taking out the resin after solidification. In the caseless film capacitor, the entire surface is covered with the mold resin 8 except for _{the first drawer terminal 5c P} ... and the second drawer terminal 5c _{N ..., which are overlapped with each other.} A part of the sheet-shaped insulating materials 6 _P and 6 _N is exposed to the outside.

In the caseless film capacitor of the above embodiment, the capacitor element group 2 which is an aggregate of the capacitor elements 1 has a plurality of juxtaposed structures in both the horizontal direction and the vertical direction, and the first polarity of such a capacitor element group 2 is provided. The first and second bus bars 3 _P and 3 _N are connected to both electrode surfaces 1 a _P and 1 a _N of the second polarity, respectively, to form the capacitor unit 7. In the capacitor unit 7, which is a basic unit as a capacitor, a plurality of capacitor element groups 2, which are an aggregate of the capacitor elements 1, are arranged side by side in both the horizontal direction and the vertical direction. Further, as such a capacitor unit 7, the first and second capacitor units 7 ₁ and 7 ₂ are prepared, and these plurality of capacitor units 7 ₁ and 7 ₂ are arranged side by side in a butt state to form a caseless film capacitor. The capacitance part of is constructed. With the above synthesis, it is possible to provide a capacitor having a sufficiently large capacitance as compared with a capacitor simply arranged side by side in the horizontal direction (a plurality of capacitors arranged side by side in the three-dimensional direction).

Of the plurality of capacitor elements 1 constituting the capacitor element group 2, one row of the plurality of capacitor elements 1 arranged in the vertical direction constitutes the capacitor element row 2a, and each capacitor element row is used as a unit. The first and second vertical electrode plates 4a _P and 4a _N are individually bridged to 2a.

As a modification of the above embodiment, in one capacitor unit 7, the first extraction terminal 5c _P and the second extraction terminal 5c _N are arranged in the horizontally long terminal plate portions 5 _P and 5 _N without shifting their positions in the longitudinal direction. It is also possible (the present invention broadly includes this aspect). In this case, if the first drawer terminal 5c _P and the second drawer terminal 5c _N are at the same height position, their overlapping positions overlap and cause a short-circuit state. Therefore, in order to avoid a short-circuit state, it is necessary to shift the height position between the superposition position of _{the first drawer terminal 5c P and} the superposition position of the second drawer terminal 5c _{N, but this increases the bulk of the capacitor.} The problem of increasing arises.

In contrast to this modification, in the above embodiment, the drawer terminals 5c _P and 5c _N are staggered and staggered in the first polarity and the second polarity, so that the first polarity and the second polarity are used. The overlapping positions of the drawer terminals 5c _P and 5c _N can be set to substantially the same height position. As a result, the bulk of the capacitor can be reduced.

In the above embodiment, the number of capacitor units 7 are two of "7 _2" and "7 _1" (even). 11, 12, as shown in FIG. 14, first capacitor unit 7 ₁ and the second capacitor unit 7 ₂ has become a symmetrical structure. As can be seen, even in the _two second capacitor unit 7 also in the first capacitor unit _71, the first busbar 3 _P is crank-shaped (vertical line + horizon + vertical line), the crank The shape is symmetrical between the two. That is, the overall shape of the horizontal posture plate portion 5b _P and the rising plate portion 5a _{P of} the first horizontally long terminal plate portion 5 _P , and in addition, the terminal inclined portion 5c _P1 and the terminal vertical portion 5c _{P2 in the drawer terminal 5c P.} Are symmetrical with each other. Second bus bar 3 _N is a 1 plane shape along the vertical direction rather than the crank-shaped, which also has a symmetrical to each other on both capacitor unit 7 _1, 7 _2.

As a result, the _{superposition position of the first drawer terminals 5c P} and the superposition position of the second drawer terminals 5c _N are the total widths of the _{two capacitor units 7 1} and 7 2 arranged side by side in the axial direction. It is in the central position and has an advantage in equalizing the current flow. Further, regarding the structure of the horizontally long terminal plate portions 5 _P , 5 _N extending a plurality of drawer terminals 5 c _P , 5 c _N , the structure of the first polarity and the structure of the second polarity can be the same or almost the same. ..

The superposition positions of the second drawer terminals 5c _N and 5c _N are the vertical and horizontal electrode plates (4a _N and 4b _N ) adjacent to each other in the two capacitor units 7 ₁ and 7 _{2 arranged side by side.} (4a _N and 4b _N ) are opposite positions.

In one capacitor unit 7, the vertical racks electrode plate 4a _N of second oblong terminal plate 5 _N and a plurality columns extending a second lead terminal 5c _N is above the second polarity electrode surface 1a _N It is located on the extension surface to. This defines the arrangement posture of _{the vertically elongated electrode plates 4a N} in a plurality of rows _{and the horizontally long terminal plate portion 5 N} to which the upper end portions thereof are connected, which are located on a plane in which _{the electrode surface 1a N is extended upward.} ing. That is, the vertical electrode plate 4a _N and the horizontally long terminal plate portion 5 _N are deployed in a substantially straight posture from the _{electrode surface 1a N.} Since it is deployed almost straight, the current path length is shorter than that of the bent deployment posture, which is further advantageous for low inductance and low loss (heat generation suppression).

Although a pair of capacitor units 7 is used in the above embodiment, the present invention is not limited to this, and may include two or more pairs.

Figure 17 shows a further embodiment according to the polarity arrangement of the first capacitor unit 7 ₁ and the second axial direction of the capacitor element 1 in the capacitor unit 7 _2. As in FIG. 14, FIG. 17 is also shown by omitting the _{insulating materials 6 N} and 6 _{P in order to avoid complication of the drawing.} FIG. 17 (a) is an enlarged view of the main part when viewed from the front side as in FIG. 14 (a), and FIG. 17 (b) is an enlarged view of the main part when viewed from the back side as in FIG. 14 (b). It is a figure. In the case of this embodiment, FIGS. 17 (a) and 17 (b) are exactly the same as the figures. However, regarding the symbols, "P" and "N" are interchanged between (a) and (b).

Previously performed has been described Example In the (FIGS. 1 to 16), the sequence of polarity in the axial direction of the capacitor element 1 in the first capacitor unit ₇₁ is toward the left to the right side (P-N) has a sequence of the polarity of the capacitor element 1 in the second capacitor unit 7 ₂ has been a (N-P). This is the reverse sequence to the first capacitor unit ₇₁ of the sequence (P-N).

In the case of FIG. 14, _{the boundary between the first capacitor unit 7 1} and the second capacitor unit 7 ₂ is represented by the symbol “=”, and the overall polarity arrangement is as follows.
(PN) = (NP)
(See FIG. 14). This is a symmetrical pattern centered on the boundary.

On the other hand, in the case of the embodiment shown in FIG. 17, the polar arrangement is a translation type repeating pattern. In short,
(PN) = (PN)
It is said. In this embodiment, the second capacitor unit 7 ₂ sequences (P-N) is made the same sequence to the first capacitor unit ₇₁ of the sequence (P-N).

In FIG. 17 (a), the polarity arrangement of electrode surfaces of the capacitor element 1 belonging to the first capacitor unit ₇₁ on the left side of the two capacitor elements 1,1 are arranged in the axial direction, left first polarity ( electrode surface 1a _P of the P-pole) and the right side has a electrode surface 1a _N of the second polarity (N-pole), also well-polar arrangement of electrode surfaces of the capacitor element 1 belonging to the second capacitor unit 7 ₂ of the right The left side is the electrode surface 1a _P of the first polarity, and the right side is the electrode surface 1a _N of the second polarity.

And due to this arrangement, the first oblong terminal plate 5 _P, whereas exhibits a first capacitor unit ₇₁ in an L-shaped angled, second capacitor unit 7 ₂ in the center boundary While the part rises straight in the vertical direction (the main part is only the riser plate part), the second horizontally long terminal plate part 5 _N is in the vertical direction at the central boundary part in the _{first capacitor unit 71.} in respect of a straight form (main unit startup plate portion only) are, we exhibit a second capacitor unit 7 _2, an L-shaped angled, which differs from the embodiment of FIG. 14 doing.

That is, with respect to separation of the magnitude of the center line, while the direction of the first capacitor unit 7 ₁ In the first horizontal terminal plate 5 _P is apart from the second oblong terminal plate 5 _N, In the second capacitor unit 7 ₂ , the second horizontally elongated terminal plate portion 5 _N is farther away than the first horizontally elongated terminal plate portion 5 _P , and the symmetry recognized in the case of FIG. 14 is lost. .. On the other hand, as a result of facing each other at the central boundary portion between different poles, it is possible to reduce the mutual inductance due to the effect of canceling the magnetic field.

In the case of the parallel movement type repeating pattern of FIG. 17 represented by (PN) = (PN) above, the second capacitor unit 7 ₂ has the same structure as the first capacitor unit 7 _1. Can be used. That is, one of them may be swiveled 180 degrees around the vertical axis so as to face the other capacitor unit.

In addition, as a modification of the embodiment of FIG. 14 in which the polar arrangement is the symmetrical pattern (PN) = (NP), the P pole and the N pole are exchanged (NP) = (P-). It may be a symmetrical pattern of N).

18 to 20 show an example of a caseless film capacitor in which the first and second bus bars are composed of a single electrode plate.

The first bus bar 3 _P has a first horizontally long terminal plate portion 5 _P extending a plurality of first drawer terminals 5 c _P, and is connected to the first horizontally long terminal plate portion 5 _P. It is configured to include a overhead electrode plate 4 _P. Each of the plurality of first lead terminal 5c _P in the first bus bar 3 _P, and a terminal inclined portion 5c _P1 and the terminal vertical portion 5c _P2. The first horizontal terminal plate 5 _P in the first busbar 3 _P has standing and raising plate portion 5a _P and the horizontal orientation plate portion 5b _P, are configured in an L-shaped angle. _{The first bus bar 3 P} having such a configuration is entirely composed of a single conductive plate.

Similarly, the second bus bar 3 _N has a second horizontally long terminal plate portion 5 _N extending a plurality of second drawer terminals 5 c _N, and connects the second horizontally long terminal plate portion 5 _N. It is configured to include a second overhead electrode plate 4 _N. Each of the plurality of second lead terminals 5c _N of the second bus bar 3 _N, and a terminal inclined portion 5c _N1 and the terminal vertical portion 5c _N2. Second oblong terminal plate 5 _N in the second busbar 3 _N is formed integrally with a vertical attitude relative to the second rack electrode plate 4 _{N. The second bus bar 3 N} having such a structure is entirely composed of a single conductive plate.

Both the first bus bar 3 _P and the second bus bar 3 _N are manufactured by sheet metal processing or press working based on a single thin plate-like flat conductive plate, so that efficient production is possible. .. _{The first overhead electrode plate 4 P} and the second overhead electrode plate 4 _N connected to the capacitor element group 2 in contact with each other are not combined in a grid pattern, but are relatively connected and developed as a whole. Although the electrode plate has a large area _{, cutout holes 4c P} and 4c _N are formed in _{the first and second overhead electrode plates 4 P} and 4 _N so as to correspond to the electrode surfaces of the individual capacitor elements 1. _{, 4d P} , 4d _N for connection extending from the edge of the cutout holes 4c _P , 4c _N to the inside of the cutout hole are provided.

A set of cutout holes 4c _P and connecting small protrusions 4d _{P, and} a set of cutout holes 4c _N and connection small protrusions 4d _N are provided with two sets for each capacitor element, and connection small protrusions 4d _P , 4d. _{At the N} portion, the electrode surfaces 1a _P and 1a _N of the capacitor element 1 are electrically and mechanically connected by soldering or the like.

In the case of this embodiment, even if the overhead electrode plates 4 _P and 4 _N have a large area of one sheet, the small projecting pieces for connection 4d _P and 4d _{projecting within the cutout holes 4c P} and 4c _{N. Since the N} portion is connected to the electrode surfaces 1a _P and 1a _N in a local connection form, it is expected that the influence of deformation such as unevenness and waviness is mitigated and a predetermined connection quality is ensured. Since it is a single piece, a relatively large cross-sectional area of the current passage is secured, which is advantageous in terms of low inductance and low loss (heat generation suppression).

The present invention relates to a caseless film capacitor as a technique for improving the quality of current inflow / outflow modes, reducing inductance, and reducing loss (heat generation suppression) while increasing the size, capacity, and weight. It is useful.

1 Capacitor element 1a _P 1st polarity electrode surface 1a _N 2nd polarity electrode surface 2 Capacitor element group 2a Capacitor element row 4a _P 1st vertical electrode plate 4a _N 2nd polarity vertical electrode plate 4b _P 1st Polar horizontal electrode plate 4b _N 2nd polar horizontal electrode plate 4a _1N Extension 5 _P 1st horizontal terminal plate 5 _N 2nd horizontal terminal plate 5a _P Stand-up plate 5b _P Horizontal posture plate Part 5c _P 1st drawing terminal 5c _N 2nd drawing terminal 7 ₁ Capacitor unit 7 ₂ 2nd capacitor unit 8 Mold resin

Claims (11)

A plurality of capacitor elements are arranged side by side in the horizontal and vertical directions in a state where the electrode surfaces of the first polarity and the second polarity at both ends in the axial direction are positioned on the same plane, respectively, to form a capacitor element group.
The electrode surfaces of the first polarity of each of the plurality of capacitor elements are connected to each other via a first overhead electrode plate, and the electrode surfaces of the second polarity of each of the plurality of capacitor elements are second to each other. Connected via the overhead electrode plate of
The first overhead electrode plate has a first horizontally long terminal plate connected to its upper end, and the second overhead electrode plate has a second horizontally long terminal plate connected to its upper end.
The first lead-out terminal of the first polarity extends from the upper end edge of the first horizontally long terminal plate portion, and the second drawer terminal of the second polarity extends from the upper end edge of the second horizontally long terminal plate portion. Equipped with at least a pair of capacitor units
The pair of capacitor units are arranged side by side in a state where the axial directions of the respective capacitor elements are parallel.
In the pair of capacitor units, the first drawer terminals having the same polarity are overlapped with each other, and the second drawer terminals having the same polarity with each other are overlapped with each other.
A caseless film capacitor characterized in that the entire surface is coated with a mold resin except for the first and second drawer terminals that are overlapped with each other. A plurality of the first drawer terminals are drawn out from a plurality of locations separated by a predetermined interval on the upper end edge of the first horizontally long terminal plate portion, while the second drawer terminal is the upper end edge of the second horizontally long terminal plate portion. Multiple drawers from multiple locations separated by a predetermined interval
The first drawer terminal and the second drawer terminal are arranged alternately so as to be displaced in the longitudinal direction of the horizontally elongated terminal plate portion, and the second drawer terminal is located between a pair of adjacent first drawer terminals. The caseless film capacitor according to claim 1, wherein the drawer terminals are located and the first drawer terminals are located between a pair of adjacent second drawer terminals. The first overhead electrode plate is provided according to the number of rows of the capacitor elements arranged in the horizontal direction, and is provided with a plurality of rows of the first vertical electrode plates for connecting the electrode surfaces of the capacitor elements arranged in the vertical direction. The caseless film capacitor according to claim 1 or 2, further comprising a first horizontal electrode plate for connecting the first vertical electrode plates in a plurality of rows in the lateral direction. The second overhead electrode plate is provided according to the number of rows of the capacitor elements arranged in the horizontal direction, and is provided with a plurality of rows of second vertical electrode plates connecting the electrode surfaces of the capacitor elements arranged in the vertical direction. The caseless according to any one of claims 1 to 3, further comprising a second horizontal electrode plate for connecting the plurality of rows of the second vertical electrode plates in the lateral direction. Film capacitor. Regarding the pair of inwardly opposed overhead electrode plates and the pair of outwardly opposed overhead electrode plates in the pair of capacitor units.
The upper end of the inwardly opposed overhead electrode plate has an extension portion extending upward from the capacitor element at the uppermost stage of the capacitor element group, and is connected via the extension portion. The horizontally long terminal plate portion is composed of a rising plate portion connected to the extending portion in a state of extending further upward.
The horizontally long terminal plate portion connected to the upper end portion of the outward facing overhead electrode plate is a horizontal posture plate portion arranged in a horizontal posture along the uppermost surface portion immediately above the uppermost surface portion of the capacitor element group. And the rising plate part that is bent and extended upward from the inner end part of this horizontal posture plate part.
The caseless film capacitor according to any one of claims 1 to 4, wherein the upper end portion of the outward facing overhead electrode plate is connected to the horizontal posture plate portion. The caseless film capacitor according to claim 5, wherein the pair of inwardly opposed overhead electrode plates have the same polarity. The caseless film capacitor according to claim 5, wherein the pair of inwardly opposed overhead electrode plates are of different polarities. The caseless film capacitor according to any one of claims 1 to 7, wherein the first drawer terminal and the second drawer terminal are arranged at substantially the same height position in the vertical direction. .. Claims 1 to 8 wherein the superposition position of the first drawer terminals and the superposition position of the second drawer terminals are the center positions of the entire axial width of the pair of capacitor units. The caseless film capacitor according to any one of the above. The present invention according to any one of claims 1 to 9, wherein at least one of the first overhead electrode plate and the second overhead electrode plate is a thin plate and is formed of a single electrode plate. Caseless film capacitors. For at least one of the first overhead electrode plate and the second overhead electrode plate, which is formed of a single electrode plate in the shape of a thin plate, the overhead electrode plate, the horizontally long terminal plate portion, and the drawer are provided. The caseless film capacitor according to claim 10, wherein all the terminals are made of a single conductive plate.

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