JP6425024B2 - Capacitor and inverter - Google Patents

Description

  The present invention relates to a capacitor, and more particularly to a capacitor used in a motor drive inverter of a hybrid vehicle or the like.

  The inverter case such as the motor drive inverter of the hybrid vehicle absorbs the noise between the sensor for controlling the inverter circuit, the smoothing capacitor, the noise absorbing capacitor connected in parallel to the smoothing capacitor, the inverter case and the ground A snubber capacitor, a power module having a switching element, a switching control board, and the like are accommodated.

  The power module receives power supply from the smoothing capacitor. Furthermore, from the viewpoint of space saving, the power module and the capacitor case are usually stacked and stored. In this case, the output terminal and the input terminal of the capacitor are disposed close to each other in the opposite state in order to reduce the inductance, and extend from the capacitor case in the direction perpendicular to the laminated surface. In general, an insulator is interposed between the output terminal and the input terminal in proximity to each other. Also, the capacitor element may be sealed with a thermosetting resin in order to improve moisture resistance and vibration resistance.

  As described above, since a large number of elements are accommodated in the inverter case, the extension position of each terminal of the capacitor is required to have high accuracy. Therefore, according to Patent Document 1, a projection or a guide is provided on a plate-like insulator (hereinafter referred to as an insulating plate) interposed between an output terminal and an input terminal, and a hole or a notch provided in each terminal Teach how to fix each terminal to the insulating plate by fitting it with the connector.

  Further, Patent Document 2 teaches a method of suppressing positional deviation of each terminal which occurs between the step of connecting each terminal to a capacitor element and the step of sealing with a thermosetting resin. That is, a mounting jig is disposed outside the capacitor case, and the mounting jig accommodates the capacitor case and the capacitor element including the respective terminals. Next, after fixing the capacitor case and each terminal to the mounting jig, the capacitor element is sealed with a thermosetting resin. The mounting jig is removed after curing of the thermosetting resin.

Unexamined-Japanese-Patent No. 2010-251400 JP, 2010-267775, A

  In the method of Patent Document 1, although the positional accuracy of each terminal with respect to the capacitor element is improved, the positional accuracy of each terminal with respect to the capacitor case is not taken into consideration. In the method of Patent Document 2, although the positional accuracy of each terminal with respect to the capacitor case is improved, the process is complicated.

According to a first aspect of the present invention, there is provided a capacitor case having a bottom portion and an opening, a capacitor element accommodated in the capacitor case and provided with a first electrode E1 and a second electrode E2, and a first connected to the first electrode E1. A second terminal T2 connected to the one terminal T1 and the second electrode E2 and having an opposing portion facing the first terminal T1, and interposed between the first terminal T1 and the second terminal T2, An insulating member including an insulating plate which insulates at least the facing portion from the first terminal T1; and the first terminal T1 and the second terminal T2 are extended portions extending to the outside of the capacitor case The capacitor case has a fixing portion A for fixing the insulating plate, the insulating member has a fixing portion B1 to be fitted to the fixing portion A, the first terminal T1 and the first terminal T1 Two ends Have a fixed portion B2 for fixing at least one of T2, the insulating plate has a extending portion PE extending outside the capacitor case, the capacitor case, at least a portion of the extending portion PE as the cover, Ru includes an extending portion CE extending from a part of the capacitor case relates to a capacitor.
According to a second aspect of the present invention, there is provided a capacitor case having a bottom portion and an opening, a capacitor element accommodated in the capacitor case, the capacitor element including a first electrode E1 and a second electrode E2, and a first element connected to the first electrode E1. A second terminal T2 connected to the one terminal T1 and the second electrode E2 and having an opposing portion facing the first terminal T1, and interposed between the first terminal T1 and the second terminal T2, An insulating member including an insulating plate which insulates at least the facing portion from the first terminal T1; and the first terminal T1 and the second terminal T2 are extended portions extending to the outside of the capacitor case The capacitor case has a fixing portion A for fixing the insulating plate, the insulating member has a fixing portion B1 to be fitted to the fixing portion A, the first terminal T1 and the first terminal T1 Two ends A flat portion fixed to at least one of T2 and formed on the insulating plate and fixed to at least one of the first terminal T1 and the second terminal T2, and the flat portion And a flat plate-like fixing member facing the flat portion.

  According to the present invention, in addition to the positional accuracy of each terminal with respect to the capacitor element, the positional accuracy of each terminal with respect to the capacitor case is improved by a simple method.

It is a perspective view showing one embodiment before carrying out resin sealing of a capacitor concerning the present invention It is a perspective view showing one embodiment of the principal part of the capacitor concerning the present invention. It is a perspective view showing one embodiment of a capacitor case concerning the present invention. It is a perspective view showing one embodiment of an insulating board concerning the present invention. It is a perspective view showing other one embodiment of the insulating board concerning the present invention. It is a perspective view showing one embodiment of fixed part A concerning the present invention. It is a sectional view showing one embodiment of the inverter concerning the present invention.

A capacitor according to the present invention includes a capacitor case having a bottom portion and an opening, a capacitor element housed in the capacitor case, including a first electrode E1 and a second electrode E2, and a first terminal connected to the first electrode E1. T1 and a second terminal T2 connected to the second electrode E2 and having an opposing portion facing the first terminal T1, and interposed between the first terminal T1 and the second terminal T2, at least And an insulating member including an insulating plate that insulates the facing portion from the first terminal T1. The first terminal T1 and the second terminal T2 each have an extension portion TE extending to the outside of the capacitor case. And the capacitor case has a fixing portion A for fixing the insulating plate, and the insulating member has a fixing portion B1 to be fitted to the fixing portion A, the first terminal T1, and Having a fixed portion B2 for fixing at least one terminal T2. The insulating plate has an extending portion PE extending to the outside of the capacitor case, and the capacitor case extends from a portion of the capacitor case so as to cover at least a portion of the extending portion PE. And an extension part CE. Alternatively, the fixing portion B2 is formed on the insulating plate, and a flat portion in contact with at least one of the first terminal T1 and the second terminal T2 and a flat fixing member facing the flat portion. have. By these, together with the positional accuracy of the terminals for the capacitor element, thereby improving the positional accuracy of the terminals for the capacitor case.

  It is preferable that the fixing portion A and the insulating plate be disposed near the opening of the capacitor case. This is because the insulating plate is easily fixed to the capacitor case. Furthermore, the insulating plate may have an extension PE that extends to the outside of the capacitor case. Thereby, when laminating | stacking a power module and a capacitor case, the extension part PE can be utilized for the insulation of the metal members which a power module has. In this case, the capacitor case preferably includes an extending portion CE which extends from a part of the capacitor case so as to cover the extending portion PE. This is to protect the insulating plate and the extension of the terminal from external load. When the capacitor case is filled with the thermosetting resin, the thermosetting resin may intrude into the gap between the insulating plate and one of the terminals and the capacitor case. In this case, the extension portion PE suppresses the leakage of the thermosetting resin to the outside of the capacitor case.

  The fixing portion A may have a rib or a groove along the direction from the bottom of the capacitor case to the opening. In this case, the fixing portion B1 preferably has a groove or a rib fitted to the rib or the groove of the fixing portion A. As a result, molding of the fixing portions A and B1 becomes easy, and it becomes easy to fit them together.

  The fixing portion B2 may be formed of a flat fixing member and a flat portion formed on the insulating plate. The flat portion abuts on at least one of the first terminal T1 and the second terminal T2 and faces the fixing member. In this case, when the fixing member presses the first terminal T1 and / or the second terminal T2 against the flat portion, the terminal is fixed to the insulating plate.

  In addition, the fixing portion B2 may be formed on the insulating plate and have a protrusion facing at least one of the first terminal T1 and the second terminal T2. In this case, at least one of the first terminal T1 and the second terminal T2 has a hole corresponding to the protrusion. The terminal is fixed to the insulating plate by inserting the projection into the hole of the terminal.

  The capacitor preferably includes a thermosetting resin filled inside the capacitor case so as to cover the capacitor element and not to cover the extension TE. This is because the moisture resistance and the vibration resistance of the capacitor element are improved.

  Moreover, the inverter which concerns on this invention is provided with the said capacitor | condenser, the power module electrically connected with the said capacitor | condenser, and a switching element, and the inverter case which accommodates these. Since the terminals of the capacitor have high positional accuracy, the operation when mounting the capacitor on the inverter becomes easy.

Hereinafter, specific embodiments of the capacitor according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the capacitor 1 includes a capacitor element 3, terminals (T1 and T2), an insulating plate 4 interposed between the terminals, and a capacitor case 2 for housing these.

  FIG. 1 shows that the capacitor case 2, a part of each of the terminals (T1 and T2) and a part of the insulating plate 4 are accommodated in the capacitor case 2. As shown in FIG. Usually, a thermosetting resin is filled in the inside of the capacitor case 2 so as to seal the elements contained in the capacitor case. 2 (a) to 2 (c) respectively show the elements constituting the capacitor 1. FIG. 2 (a) shows the insulating plate 4, FIG. 2 (b) shows a part of the capacitor element 3 and the terminals (T1 and T2), and FIG. 2 (c) shows a fixed portion A (Aa and Ab) having grooves. 1 shows a part of the capacitor case 2 provided with the.

[Capacitor element]
The capacitor element 3 includes a first electrode E1 and a second electrode E2 (both not shown) of different polarities. Each electrode is, for example, a metallikon electrode. The first terminal T1 is connected to the first electrode E1. The first terminal T1 includes a bus bar portion T1B (see FIG. 1) connected to the first electrode E1 and a region from a bent portion T1a (see FIG. 2B) of the first terminal T1 to an end T1b And a terminal portion. The terminal portion includes an end portion T1b, and includes a first extension T1E that extends from the capacitor case 2 to the outside and is exposed from the capacitor case 2. When the capacitor element 3 is configured of a plurality of capacitor elements, the first electrodes of the capacitor elements are connected by the bus bar portion T1B.

  The second terminal T2 is connected to the second electrode E2. Similarly, the second terminal T2 also includes a bus bar portion T2B connected to the second electrode E2, and a terminal portion which is a region from the bent portion T2a to the end portion T2b of the second terminal T2 (see FIG. 2B). . The terminal portion includes an end T2b, and includes a second extension T2E that extends from the capacitor case 2 to the outside and is exposed from the capacitor case 2. When the capacitor element 3 is configured of a plurality of capacitor elements, the second electrodes of the capacitor elements are connected by the bus bar portion T2B.

  The first terminal T1 and the second terminal T2 connected to the electrodes of different polarities partially overlap each other. That is, the second terminal T2 includes the facing portion T2F facing the first terminal T1, and the first terminal T1 includes the facing portion T1F (not shown) facing the second terminal T2. In the facing portion (T1F and T2F), the current on the input side (or output side) flowing to the first terminal T1 and the current on the output side (or input side) flowing to the second terminal T flow in the opposite direction to each other. Therefore, the inductance generated by the flow of each current is cancelled, and the impedance is reduced. The facing portion T2F is, for example, a portion facing the region from the bending portion T1a of the first terminal T1 to the extending portion T1E in the second terminal T2.

  The extension portions (T1E, T2E) extend from the opening 2A of the capacitor case 2 toward the outside of the capacitor case 2. The direction of the extension is not particularly limited, and may be a direction toward the connection destination (for example, power module) of the end Tb (T1 b and T2 b). In addition, the direction of extending | stretching is the direction of the straight line which bisects the width | variety (length of the direction perpendicular | vertical to the extending | stretching direction of the terminal T) of the extension part TE.

  The number of first terminals T1 and second terminals T2 is not particularly limited. The number of terminals may be two or more, and can be set appropriately. At least one of the first and second terminals extends in the direction toward the power module.

[Capacitor case]
The capacitor case 2 has a bottom 2B and an opening 2A, and the opening 2A is partitioned by an end (opening end 2C) of a side surface rising substantially vertically from the periphery of the bottom 2B of the capacitor case 2.

  The capacitor case 2 has a size that can accommodate the entire capacitor element 3. Furthermore, when the inside of the capacitor case 2 is filled with a thermosetting resin, the size is preferably such that the entire surface of the capacitor element 3 can be covered. The material is not particularly limited, but polyphenylene sulfide (PPS) or the like is preferable in terms of heat resistance.

  The capacitor case 2 has a fixing portion A for fixing the insulating plate 4. The shape of the fixing portion A is not particularly limited. Above all, it is preferable to have ribs or grooves (Aa, Ab) along the direction from the bottom 2B of the capacitor case 2 toward the opening 2A (see FIG. 2C). This is because the insulating plate 4 can be fixed to the capacitor case 2 by a simple method of inserting the insulating plate 4 from the opening 2 A of the capacitor case 2.

Note that along the direction from the bottom 2B of the capacitor case 2 to the opening 2A, and, when a straight line is drawn L ₂ connecting the bottom 2B of the open end portion 2C in the shortest, the angle theta ₂ formed by the straight line L ₂ is 0 When it is -20 °.

  The fixing portion A may be integrally formed with the capacitor case 2, or the fixing portion A may be formed separately from the capacitor case 2 and may be joined to the capacitor case 2. Above all, in terms of work efficiency, the fixing portion A is preferably formed integrally with the capacitor case 2. The size of the fixing portion A is not particularly limited, as long as it can fix the insulating plate 4 and can be fitted to the fixing portion B1 formed on the insulating plate 4.

When fixing portion A has a rib or groove along the direction from bottom 2B of capacitor case 2 toward opening 2A, fixing portion A is a claw at a position corresponding to a position slightly above the upper end portion of inserted insulating plate 4 It is preferable to have 9A (refer FIG. 3). The claw 9A is for fixing the insulating plate 4 by a so-called snap fit structure, and the insulating plate 4 once inserted below the claw 9A is unlikely to come off. As a result, the fixing of the insulating plate 4 (and the terminal T fixed to the insulating plate 4) to the capacitor case 2 becomes more reliable. The shape of the claw 9A is not particularly limited. For example, it is easy to merge the insulating plate 4, and, once inserted an insulating plate 4 so that difficult to pull out, the straight line L ₂ parallel to the direction of the cross section of the claw 9A is gradually from the bottom portion 2B toward the opening 2A It may be tapered.

  The position of the fixing portion A is not particularly limited as long as it is formed between the bottom 2B of the capacitor case 2 and the opening end 2C. In particular, the fixing portion A is preferably disposed in the vicinity of the opening 2A of the capacitor case 2. This is because the insulating plate 4 can be easily fixed to the capacitor case 2. In this case, a part of the insulating plate 4 may extend to the outside of the capacitor case 2 to form an extension PE.

  When the extension part PE is formed, it is preferable that the capacitor case 2 includes the extension part CE which is extended from a part of the capacitor case 2 as shown in FIG. 3. By covering the extension PE of the insulating plate with the extension CE, the insulating plate 4 and the terminals T extending from the capacitor case 2 can be protected from external load. Further, when the thermosetting resin is filled in the capacitor case 2, the thermosetting resin enters the gap between the insulating plate 4 and one of the terminals T and the inner wall of the capacitor case 2, and the liquid of the thermosetting resin flows by capillary phenomenon. The surface may rise and leak to the outside of the capacitor case 2. However, the extension part CE suppresses the leakage of the thermosetting resin to the outside.

  The size and shape of the extension part CE are not particularly limited, as long as they can cover at least a part of the extension part PE.

  The fixing portion A may be provided with a convex portion 5A slightly raised on the fixing portion B1 side in a portion to be fitted to the fixing portion B1 of the insulating plate (see FIG. 6). The insulating plate 4 is pressed against the inner surface of the fixing portion A by the convex portion 5A coming into contact with the fixing portion B1 so that the insulating plate 4 is strongly fixed by the capacitor case 2. The shape of the convex portion 5A is not particularly limited. For example, as shown in FIGS. 6 (a) and 6 (b), when the fixing portion A has a groove or a rib, the convex portion 5A may have a ridge shape along the groove or the rib.

[Insulation member]
The insulating member comprises an insulating plate 4. The insulating plate 4 is interposed between the first terminal T1 and the second terminal T2. The insulating plate 4 may be disposed at least between the facing portion T2F and the facing portion T1F. Thereby, the first terminal T1 and the second terminal T2 are insulated.

  The shape of the insulating plate 4 is not particularly limited, and it may be a shape in which a part of the insulating plate 4 is interposed between at least both opposing portions so that the opposing portions do not contact each other. For example, as shown in FIG. 2, the insulating plate 4 may be flat. The material is not particularly limited as long as it is an insulator, and among them, polyphenylene sulfide (PPS) or the like is preferable in terms of heat resistance.

  The insulating member has a fixing portion B1 fitted with the fixing portion A, and a fixing portion B2 fixing the first terminal T1 and / or the second terminal T2. As a result, together with the positional accuracy of each terminal T with respect to the capacitor element 3, the positional accuracy of each terminal T with respect to the capacitor case 2 improves.

  The shape of the fixing portion B1 is not particularly limited as long as it is a shape that fits with the fixing portion A. For example, as shown in FIG. 2C, when the fixing portion A has fixing portions Aa and Ab having grooves along the direction from the bottom portion 2B of the capacitor case 2 toward the opening 2A, the fixing portion B1 It has fixing | fixed part B1a and B1b which have a rib which fits in a groove | channel. When the fixing portion A has a fixing portion having a rib extending in the direction from the bottom portion 2B of the capacitor case 2 toward the opening 2A, the fixing portion B1 has a fixing portion having a groove sandwiching the rib.

But not limited number of fixed portion B1 in particular, at least the fixed portion B1 is preferably formed on one end face along the straight line L ₂ direction of the insulating plate 4 (see FIG. 2 (a)). This is because the insulating plate 4 can be fixed to the capacitor case 2 by a simple method of inserting the insulating plate 4 from the opening 2 A of the capacitor case 2. In particular, the fixing portion B1 is preferably formed on the both end faces. This is because the insulating plate 4 is more firmly fixed to the capacitor case 2.

  Instead of providing the convex portion 5A in the fixed portion A, the convex portion 5B slightly raised on the fixed portion A side may be provided in a portion of the fixed portion B1 fitted to the fixed portion A of the capacitor case 2 (see FIG. Not shown). When the convex portion 5B bites into the fixing portion A and contacts, the inner surface of the fixing portion A of the capacitor case 2 is pressed by the insulating plate 4, and the insulating plate 4 is strongly fixed by the capacitor case 2. The shape of the convex portion 5B is not particularly limited. For example, it may be bowl-shaped along the fixing portion B1.

  The shape and configuration of the fixing portion B2 are not particularly limited. For example, as shown in FIG. 4, the fixing portion B2 may include the flat portion 7 and the fixing member 6. The flat portion 7 is formed on the insulating plate 4 and abuts on the first terminal T1 and / or the second terminal T2. The fixing member 6 is a flat member facing the flat portion 7. That is, the insulating member includes the fixing member 6 in addition to the insulating plate 4. When the fixing member 6 presses the first terminal T1 and / or the second terminal T2 against the flat portion 7, the terminals are strongly fixed to the insulating plate 4.

In this case, the fixing member 6 has a groove 6g or ribs (not shown) on the end face along the straight line L ₂ direction, the insulating plate 4, a position corresponding to the groove 6g or ribs ribs 8 or the groove (shown Is preferred. After arranging the first terminal T1 and / or the second terminal T2 in the flat portion 7, the terminal T is pressed and fixed to the insulating plate 4 by a simple method of inserting the fixing member 6 into the rib 8 or the groove. Ru. The material of the fixing member 6 is not particularly limited as long as it is an insulator, but in terms of work efficiency, the same material as the insulating plate 4 is preferable.

  Furthermore, in this case, the fixing portion B2 preferably includes a claw 9B at a position above the inserted fixing member 6 of the insulating plate 4 (see FIG. 5). Similar to the claw 9A, the claw 9B is for fixing the fixing member 6 with a so-called snap fit structure, and the fixing member 6 once inserted below the claw 9B is difficult to remove. As a result, the fixing of the terminal T to the insulating plate 4 becomes more reliable. The shape of the claw 9B is not particularly limited, and may be similar to that of the claw 9A, for example.

  Further, as shown in FIG. 2A, the fixing portion B2 may include the protrusion 10. The protrusion 10 is formed on the insulating plate 4 and faces the first terminal T1 and / or the second terminal T2. In this case, the first terminal T1 and / or the second terminal T2 have the hole 11 corresponding to the protrusion 10 (see FIG. 2 (b)). The terminal T is easily fixed to the insulating plate 4 by fitting the protrusion 10 into the hole 11.

  The shape and the number of the protrusions 10 are not particularly limited, but it is preferable to provide at least two for one terminal. This is because, if only one protrusion 10 is provided for one terminal, the terminal may rotate about this protrusion 10. The shape and the number of the holes 11 are not particularly limited, and may correspond to the protrusions 10.

  The fixing portion B2 may have two or more flat portions 7 in contact with both the first terminal T1 and the second terminal T2 and two or more fixing members 6 facing each flat portion 7. In addition, the fixing portion B2 may have a protrusion 10 facing both the first terminal T1 and the second terminal T2. In this case, each of the first terminal T1 and the second terminal T2 includes the hole 11 corresponding to the protrusion 10. Furthermore, the fixing portion B2 includes the flat portion 7 contacting the first terminal T1 and the fixing member 6 facing the flat portion 7, and the protrusion 10 provided to face the second terminal T2. It is good. In this case, the second terminal T2 includes the hole 11 corresponding to the protrusion 10.

  As described above, in the present embodiment, the insulating member used to insulate the terminals from each other, in addition to the fixing portion B2 for positioning the terminals and the insulating plate, the fixing portion for positioning the insulating plate with respect to the capacitor case Form B1. Thereby, the position of the terminal with respect to the capacitor case can be determined with high accuracy without increasing the number of steps in a simple method without using elements (other jigs and the like) other than those constituting the capacitor. Furthermore, since each terminal is firmly fixed to the capacitor case, positional deviation does not easily occur even during transportation or assembly to an inverter or the like. Therefore, as described later, when the thermosetting resin is filled in the capacitor case, peeling of the cured thermosetting resin caused by displacement of the terminal is hard to occur, and the moisture resistance and vibration resistance by the thermosetting resin It is easy for the improvement effect of the sex to be exhibited.

[Thermosetting resin]
The inside of the capacitor case 2 may be filled with a thermosetting resin (not shown) so as to cover the capacitor element 3 and not to cover the extended portions TE of the terminals T. Thereby, the moisture resistance and the vibration resistance of the capacitor element 3 are improved.

  The type of thermosetting resin is not particularly limited, and examples thereof include epoxy resin, silicone resin, and phenol resin. Among them, epoxy resins are preferred in view of strength.

  Although the filling amount of the thermosetting resin is not particularly limited, it is an amount which can cover the entire surface of the capacitor element 3 accommodated in the capacitor case 2 and does not cover the extended portion TE of the terminal T. The insulating plate 4 may be partially or entirely covered with a thermosetting resin.

[Inverter]
The inverter 12 of the present invention includes an inverter case 20, the capacitor 1 and the power module 30. The capacitor 1 and the power module 30 are accommodated in the inverter case 20 (see FIG. 7). The capacitor 1 may be entirely housed in the inverter case 20, or may be partially exposed from the inverter case 20 as shown in FIG.

  Capacitor 1 and power module 30 are electrically connected by terminals T1 and T2. The power module 30 includes a switching element (not shown).

  The inverter case 20 has a size sufficient to accommodate all or part of the capacitor 1 and the power module 30. The material is not particularly limited, and aluminum or the like can be exemplified. The inverter case 20 is manufactured by, for example, high pressure casting (die casting) of these metals.

  The inverter case 20 includes, for example, a lower case 21 and a middle case 22 in which the capacitor 1 is fitted and accommodated, and an upper case 23 in which the power module 30 is accommodated. The middle case 22 has a bottom portion interposed between the capacitor 1 and the power module 30, and the bottom portion is provided with one or more through holes. The extensions T1E and T2E are connected to the power module 30 housed in the upper case 23 through the through holes.

Hereinafter, the capacitor element 3 will be described in more detail.
[Capacitor element]
The capacitor element 3 may have any known function as a capacitor element incorporated in an inverter, and is, for example, a smoothing capacitor for smoothing a voltage, a filter capacitor for taking out a specific frequency component, a snubber capacitor or the like. The capacitor element 3 can include a single or two or more types of capacitor elements that exhibit these effects.

  The type of the capacitor element 3 is not particularly limited, and for example, a film capacitor, a tantalum capacitor, an aluminum electrolytic capacitor and the like can be exemplified. Among them, a film capacitor is preferable in that the inductive loss is small and the withstand voltage is excellent.

  The film capacitor is known to use, as an electrode, a metal foil and a metallized film in which a metal is deposited on a resin film. Among them, a film capacitor using a metallized film as an electrode is preferably used in that it is easy to miniaturize and light. A metallized film can be obtained by vapor-depositing a metal in a predetermined pattern on one side of a resin film. An electrode pair is formed by superposing two obtained metallized films so that vapor deposition metal sides may face via a resin film. Alternatively, metal may be vapor deposited in a predetermined pattern on both sides of the resin film to form a metallized film, and the metallized film and the resin film for insulation may be laminated to form an electrode pair. The formed electrode pair is wound as it is. Alternatively, a plurality of electrode pairs which are cut into a predetermined shape and cut are stacked. Among them, it is preferable that the electrode is a wound type in that the production is easy.

  The material of the resin film is not particularly limited, and examples thereof include polypropylene, polyethylene terephthalate, polyethylene naphthalate, polyphenyl sulfide, and polystyrene. Among them, polypropylene is preferable in that the induction loss is particularly small.

  The metal deposited on the resin film is also not particularly limited, and examples thereof include aluminum, zinc, tin, magnesium, and alloys thereof. Among them, aluminum is preferably used in terms of excellent corrosion resistance.

  For example, an electrode (metallikon electrode) is formed by metal spraying on an end face perpendicular to the main surface of the stacked electrode group or an end face of the wound electrode, and the capacitor element 3 is manufactured. The first terminal T1 is connected to one electrode E1 of the capacitor element 3. The first terminal T1 includes a bus bar portion T1B connected to the first electrode E1, and a terminal portion which is a region from the bent portion T1a of the first terminal T1 to the end T1b. A part of the terminal portion is a first extension T1E extending from the capacitor case 2. The bus bar portion T1B and the terminal portion can be formed, for example, by bending a copper metal plate.

  When the capacitor element 3 is configured of a plurality of capacitor elements, one electrodes of the capacitor elements are connected by, for example, a bus bar portion T1B.

  The other electrode E2 of the capacitor element 3 is connected to the second terminal T2. The second terminal T2 includes a bus bar portion T2B connected to the second electrode E2, and a terminal portion which is a region from the bent portion T2a of the second terminal T2 to the end T2b. A part of the terminal portion is a second extension T2E extending from the capacitor case 2. The bus bar portion T2B and the terminal portion may be formed by bending a copper metal plate as described above.

  The capacitor of the present invention can be mounted on an inverter for driving a motor such as a hybrid car.

1: Capacitor 2, 2: Capacitor case, 2A: Opening, 2B: Bottom, 2C: Opening end, 3: Capacitor element, 4: Insulating plate, 5A, 5B: Convex, 6: Fixing member, 6g: Groove, 7 : Flat part, 8: Rib, 9A, 9B: Tab, 10: Projection, 11: Hole part, 12: Inverter, 20: Inverter case, 21: Lower case, 22: Middle case, 23: Upper case, 30: Power module

Claims (9)

A capacitor case having a bottom and an opening;
A capacitor element housed in the capacitor case and comprising a first electrode E1 and a second electrode E2;
A first terminal T1 connected to the first electrode E1;
A second terminal T2 connected to the second electrode E2 and having an opposing portion facing the first terminal T1;
An insulating member including an insulating plate interposed between the first terminal T1 and the second terminal T2 and insulating at least the facing portion from the first terminal T1;
Each of the first terminal T1 and the second terminal T2 has an extension TE extending to the outside of the capacitor case,
The capacitor case has a fixing portion A for fixing the insulating plate,
It said insulating member is fixed portions B1 to be fitted with the fixed portion A, and have a fixed portion B2 for fixing at least one of the first terminal T1 and the second terminal T2,
The insulating plate has an extending portion PE extending to the outside of the capacitor case,
Said capacitor case to cover at least a portion of the extending portion PE, Ru includes an extending portion CE extending from a part of the capacitor case, a capacitor. The fixing portion B2 is
The flat plate-like fixing member formed on the insulating plate and in contact with at least one of the first terminal T1 and the second terminal T2 and a flat fixing member facing the flat portion are provided. Capacitor according to 1 .   A capacitor case having a bottom and an opening;
  A capacitor element housed in the capacitor case and comprising a first electrode E1 and a second electrode E2;
  A first terminal T1 connected to the first electrode E1;
  A second terminal T2 connected to the second electrode E2 and having an opposing portion facing the first terminal T1;
  An insulating member including an insulating plate interposed between the first terminal T1 and the second terminal T2 and insulating at least the facing portion from the first terminal T1;
  Each of the first terminal T1 and the second terminal T2 has an extension TE extending to the outside of the capacitor case,
  The capacitor case has a fixing portion A for fixing the insulating plate,
  The insulating member has a fixing portion B1 fitted with the fixing portion A, and a fixing portion B2 fixing at least one of the first terminal T1 and the second terminal T2;
  The fixing portion B2 is
  A flat portion formed on the insulating plate and in contact with at least one of the first terminal T1 and the second terminal T2;
  And a flat fixing member facing the flat portion. The insulating plate has an extending portion PE extending to the outside of the capacitor case,
4. The capacitor according to claim 3 , wherein the capacitor case includes an extension part CE extended from a part of the capacitor case so as to cover at least a part of the extension part PE. The capacitor according to any one of claims 1 to 4, wherein the fixing portion A and the insulating plate are disposed near the opening of the capacitor case. The fixing portion A has a rib or a groove along a direction from the bottom of the capacitor case to the opening,
The capacitor according to any one of claims 1 to 5 , wherein the fixing portion B1 has a groove or a rib fitted to the rib or the groove along the direction. The fixing portion B2 is
It has a projection formed on the insulating plate and facing at least one of the first terminal T1 and the second terminal T2;
The capacitor according to any one of claims 1 to 6 , wherein at least one of the first terminal T1 and the second terminal T2 has a hole corresponding to the protrusion. The capacitor according to any one of claims 1 to 7 , further comprising a thermosetting resin filled inside the capacitor case so as to cover the capacitor element and not to cover the extension part TE. A capacitor according to any one of claims 1 to 8 ;
A power module electrically connected to the capacitor and including a switching element;
And an inverter case for housing these.

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