JP2019033133A - Capacitor - Google Patents

Abstract

To provide a capacitor capable of pulling an external connection part out of the vicinity of a center of a case.SOLUTION: The present invention relates to a capacitor in which a capacitor element 2 including electrode parts 2a and 2b in both ends and a pair of positive and negative electrode plates 5 and 6 for external connection including external connection parts 5b and 6b are accommodated in a case 7. Multiple capacitor elements 2 are arranged side by side in a state where the electrode parts 2a and 2b are directed outwards, and connected with the electrode plates 5 and 6 for external connection via electrode plates 3 and 4 for element which connect the capacitor elements 2 in common. The pair of positive and negative electrode plates 5 and 6 for external connection include main body parts 5a and 6a which are overlapped in a vertical direction at an upper side of the capacitor element 2 and connected with the electrode plates 3 and 4 for element, and the external connection parts 5b and 6b extend from outer edges of the main body parts 5a and 6a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a capacitor in which a capacitor element and an electrode plate are housed in a case.

  Patent Document 1 discloses a capacitor in which a plurality of capacitor elements and electrode plates are housed in a case. In this capacitor, lead wires are raised from the capacitor elements arranged in a plane, and the capacitor elements and the electrode plates are connected via the lead wires. In addition, a pair of positive and negative electrode plates are superposed on each other above the capacitor element, thereby reducing the inductance.

JP 2010-258343 A

  By the way, each electrode plate is provided with the external connection part for connecting with an external apparatus, respectively. However, in the case of the capacitor having the above configuration, the drawing position of the external connection portion cannot be set freely. That is, in order to connect the electrode plate and each capacitor element, the electrode plate needs to have a main body having a width (wideness) that can cover at least each lead wire in plan view, Capacitor elements are usually arranged over almost the entire bottom surface of the case, so the width of the main body is approximately equal to the width of the case, and external connections that extend away from the main body (that is, from the outer edge of the main body). The part was naturally located near the case side wall. In this case, depending on the positional relationship with the external device, there may be a problem that the connection distance becomes long or the shape of the external connection portion becomes complicated.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a capacitor capable of pulling out an external connection portion from the vicinity of the center of the case.

  The capacitor of the present invention is a capacitor in which a capacitor element 2 having electrode portions 2a and 2b at both ends and a pair of positive and negative external connection electrode plates 5 and 6 having external connection portions 5b and 6b are accommodated in a case 7. Thus, a plurality of capacitor elements 2 are arranged with the electrode portions 2a and 2b facing outward, and external connection electrode plates 5 and 6 are connected via element electrode plates 3 and 4 that connect the capacitor elements 2 in common. A pair of positive and negative external connection electrode plates 5 and 6 are connected to the element electrode plates 3 and 4 and overlap with each other in the vertical direction above the capacitor element 2. The external connection parts 5b and 6b are respectively extended from the outer edges of the main body parts 5a and 6a.

  In the capacitor of the present invention, a plurality of capacitor elements are commonly connected by the element electrode plate. Therefore, the external connection electrode plate is connected to each capacitor element as long as it is connected to the element electrode plate in at least one place. Will be. Therefore, it is not necessary to increase the width of the body part of the electrode plate for external connection in order to connect to the capacitor element, the width of the body part can be reduced, and the external connection part can be pulled out from the vicinity of the center of the case. Become.

It is a disassembled perspective view which shows the capacitor | condenser which concerns on one Embodiment of this invention. It is a perspective view which shows the state which combined the capacitor | condenser element, the electrode plate for elements, and the electrode plate for external connection. It is a perspective view of a capacitor.

  Next, an embodiment of the capacitor 1 of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the capacitor 1 of the present invention includes a plurality of capacitor elements 2, element electrode plates 3 and 4 for commonly connecting the plurality of capacitor elements 2, and element electrode plates 3 and 4. External connection electrode plates 5 and 6 to be connected to the capacitor element 2, the element electrode plates 3 and 4, the case 7 for housing the external connection electrode plates 5 and 6, and the case 7 filled with the capacitor element 2 And a resin 8 for sealing. Hereinafter, each component will be described in detail. In the description, the concept of “upper and lower” is at the time of manufacturing, more specifically, at the time of resin filling, and does not necessarily define the upper and lower at the time of use.

  The capacitor element 2 is a film capacitor formed by winding a metallized film in which a metal is vapor-deposited on an insulating film, for example, and is formed by spraying metal on both end surfaces in the axial direction as shown in FIG. Electrode portions 2a and 2b are respectively formed. When the capacitor element 2 is viewed from the axial direction, the capacitor element 2 has a flat shape, specifically, a substantially track shape (a shape in which two parallel lines and both ends thereof are connected by a semicircle), and a flat portion 2c and a curved surface portion on the outer periphery in the axial direction. 2d.

  A plurality of capacitor elements 2 having the above-described configuration are arranged with the electrode portions 2a and 2b facing outward. More specifically, the flat portions 2c and 2c are opposed to each other while the curved surface portions 2d and 2d are directed vertically. A plurality (four) of capacitor elements are arranged in such a manner to constitute a capacitor element group.

  The pair of positive and negative element electrode plates 3, 4 are substantially strip-shaped substrate portions 3 a, 4 a, element connection pieces 3 b, 4 b for connecting to the electrode portions 2 a, 2 b of the capacitor element 2, and external connection, respectively. Electrode plate connection pieces 3c and 4c for connection to the electrode plates 5 and 6 for use. Since the element electrode plates 3 and 4 are positive and negative and have the same shape, only one element electrode plate 3 will be described, and the other element electrode plate 4 will be denoted by the same subscript. Omitted.

  The horizontal length of the substrate portion 3a of the element electrode plate 3 has a length that can extend over all the electrode portions 2a of a plurality (four) of capacitor elements 2 constituting the capacitor element group. The element connection piece 3b is extended downward from the lower side of the substrate portion 3a which is long in the horizontal direction. Further, each capacitor element 2 is provided at a position corresponding to the electrode portion 2a. The electrode plate connection piece 3c extends upward from the upper side of the substrate portion 3a. Further, it is provided so as to be offset toward one of the both ends in the horizontal direction of the substrate portion 3a. In this embodiment, two of the two are provided so as to be offset toward the front end on the paper surface. The electrode plate connection piece 3 c protrudes above the upper end of the capacitor element 2 in a side view when the element electrode plate 3 is connected to the capacitor element 2. Such an element electrode plate 3 is formed by, for example, pressing (punching) a conductive plate material (metal plate) such as copper or aluminum. In addition, there is no bending process to a plate | board thickness direction, and it is flat form.

  The capacitor element group is sandwiched from both sides by a pair of positive and negative element electrode plates 3 and 4, and one element electrode plate 3 is connected to one electrode portion 2 a of the capacitor element 2 and the other electrode portion 2 b of the capacitor element 2. The other element electrode plate 4 is connected by soldering or welding to form a module. A module group is configured by arranging a plurality (four) of the modules such that the electrode parts 2a, 2a (2b, 2b) having the same polarity of the capacitor element 2 face each other.

  A pair of positive and negative external connection electrode plates 5 and 6 includes main body portions 5a and 6a located above the capacitor element 2, and external connection portions 5b and 6b extending from the outer edges of the main body portions 5a and 6a, respectively. I have. Since the pair of external connection electrode plates 5 and 6 are different in shape from each other, one external connection electrode plate 5 (the upper external connection electrode plate in the drawing) will be described first.

  The main body 5a has a length L1 in a direction orthogonal to the longitudinal direction of the element electrode plates 3 and 4 in plan view, and is substantially the same as the length L2 in the longitudinal direction of the module group (the axial direction of the capacitor element 2). ing. On the other hand, the width W1 in the direction parallel to the longitudinal direction of the element electrode plates 3 and 4 is smaller than the width W2 in the short direction of the module group (the direction perpendicular to the axial direction of the capacitor element 2). Specifically, it is about 2/3 (see FIG. 2).

  The main body part 5a is provided with a connection part 5c for connecting to the electrode plate connection piece 3c at a position facing the electrode plate connection piece 3c of one element electrode plate 3 having the same polarity. Yes. The connection portion 5c is provided with an insertion hole 5d for inserting the electrode plate connection piece 3c. Moreover, in order to suppress the heat | fever by soldering or welding from propagating from the connection part 5c to the periphery, the circumference | surroundings of the connection part 5c are notched or the connection part 5c protrudes. Furthermore, the height of the connecting portion 5c is lower than the other portions. This is a device for aligning the height position with the connecting portion 5c of the other polarity electrode plate located below. Further, in order to avoid the connection with the electrode plate connection piece 4c of the other element electrode plate 4 having a different polarity, the main body portion 5a has an avoidance portion 5e (cut-off portion) at a position facing the electrode plate connection piece 4c. Notch) is provided. In addition, a through hole 5f is provided in order to secure the passage of the resin 8 when resin molding is performed and to prevent bubbles from accumulating on the lower surface of the main body 5a. The through holes 5f are preferably provided so as to be located between the modules.

  The external connection portion 5b extends upward from the side (outer edge) opposite to the side where the connection portion 5c and the avoidance portion 5e of the main body portion 5a are provided. A plurality (three) of the external connection portions 5b are provided at equal intervals, but one may be provided. In the figure, 5g is an input unit connected to a power source. The input portion 5g extends outside the case 7 so as to straddle a case side wall portion 7b described later.

  The other external connection electrode plate 6 is opposite to the external connection electrode plate 5 in the positional relationship between the connection portion 6c and the avoidance portion 6e. Further, the external connection parts 5b and 6b having different polarities and the input parts 5g and 6g are provided so as not to overlap each other. Furthermore, the height position of the connecting portion 6c is the same as the other portions. In other respects, the configuration is substantially the same as that of one of the external connection electrode plates 5, and for example, the length L1 and the width W1 of the main body 6a are substantially the same. Description is omitted. The external connection electrode plates 5 and 6 are also formed by pressing (punching and bending) a conductive plate material (metal plate) such as copper or aluminum.

  The case 7 has a hollow rectangular parallelepiped shape, and includes a case bottom portion 7a having a rectangular shape in plan view and case side wall portions 7b erected from four sides of the case bottom portion 7a. An opening 7c is provided on the surface (upper surface side) facing the case bottom 7a. Such a case 7 is manufactured, for example, by integrally molding a synthetic resin. However, the metal plate may be processed and manufactured. The resin 8 filled in the case 7 is, for example, an epoxy resin. However, the present invention is not limited to this, and various known resins such as urethane resins can be used.

  Next, a method for manufacturing the capacitor 1 will be described. First, as described above, four capacitor elements 2 are arranged in a line so that the flat portions 2c and 2c face each other to form a capacitor element group, and the capacitor element group is made up of a pair of positive and negative element electrode plates 3. 4, the module is configured by connecting each capacitor element 2 and the element electrode plates 3 and 4 by soldering or welding. The four modules are arranged so that the electrode portions 2a, 2a (2b, 2b) of the capacitor element 2 face each other, and the element electrode plates 3, 3 (4, 4) face each other. Are arranged side by side to form a module group. When constituting a module or a module group, the electrode plate connection pieces 3c, 4c of the element electrode plates 3, 4 are shifted to one side, except for those located at both ends. The electrode plate connection pieces 3c (4c) are gathered.

  Next, the main body portions 5a and 6a of the external connection electrode plates 5 and 6 are overlapped on the module group so that the insertion holes 5d (6d) of the external connection electrode plate 5 (6) are used for elements. The electrode plate connection piece 3c (4c) of the electrode plate 3 (4) is inserted, and the capacitor element 2 and the external connection electrode plate 5 are connected via the element electrode plates 3 and 4 by soldering or welding. 6 is connected. The connection portion 5c (6c) is provided with four insertion holes 5d (6d) except those located at both ends, and the four electrode plate connection pieces 3c (4c) gathered at one place are provided. It is connected to the same external connection electrode plate 5 (6). Therefore, the electrode portions 2a, 2a (2b, 2b) facing each other and the element electrode plates 3, 3 (4, 4) have the same polarity. In this state, the main body portions 5a and 6a of the pair of positive and negative external connection electrode plates 5 and 6 overlap with each other in the vertical direction above the capacitor element 2 while ensuring insulation. Furthermore, since the width W1 is smaller than the width W2 of the module group, the external connection portions 5b and 6b are located on the outermost side above the module group, more specifically in the longitudinal direction of the element electrode plates 3 and 4. It is located above the capacitor element 2 on the inner side of the capacitor element 2 positioned at the position.

  Then, the capacitor element 2, the element electrode plates 3, 4 and the external connection electrode plates 5, 6 integrated with each other are made to protrude upward from the opening 7c with the external connection portions 5b, 6b and the input portions 5g, 6g. In this way, the case 1 is accommodated, the case 7 is filled with the resin 8, and the external connection portions 5b and 6b and the input portions 5g and 6g are removed and sealed with the resin, thereby completing the manufacture of the capacitor 1.

  Capacitor 1 having the above configuration is connected to each capacitor element 2 because a plurality of capacitor elements 2 are connected in common by element electrode plates 3 and 4, instead of starting up a lead wire from each capacitor element 2. Therefore, it is not necessary to increase the width of the main body portions 5a and 6a, and the width W1 of the main body portions 5a and 6a can be reduced. Therefore, although the external connection portions 5b and 6b are extended from the outer edges of the main body portions 5a and 6a, the external connection portion 5b is seen in a plan view and in a direction parallel to the longitudinal direction of the element electrode plates 3 and 4. , 6b can be positioned closer to the center of the module group, and as a result, the external connection portions 5b, 6b can be extended from the vicinity of the center of the case 7 to the outside.

  Further, by changing the width W1 of the external connection electrode plates 5 and 6, it is possible to change the lead-out positions of the external connection portions 5b and 6b without changing the shape of the element electrode plates 3 and 4. Cost reduction. Instead of changing the width W1 of the external connection electrode plates 5 and 6, the positions of the electrode plate connection pieces 3c and 4c of the element electrode plates 3 and 4 are shifted in the horizontal direction along the substrate portions 3a and 4a. May be provided. Even in this case, the same effect can be obtained.

  Furthermore, since the main body portions 5a and 6a of the pair of positive and negative external connection electrode plates 5 and 6 are overlapped with each other, the inductance can be reduced. Further, when the positions of the electrode plate connection pieces 3c and 4c are shifted in the horizontal direction when changing the drawing positions of the external connection portions 5b and 6b, the overlapping area of the main body portions 5a and 6a does not change. While changing the drawing positions of 5b and 6b, the variation of the equivalent series inductance (ESL) can be made small. When changing the width W1 of the external connection electrode plates 5, 6, the overlapping area of the main body parts 5a, 6a will change, but due to design considerations that do not change the overlapping area ratio directly under the external connection parts 5b, 6b, ESL fluctuations are small.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, the number of capacitor elements 2 in the capacitor element group and the number of modules in the module group can be changed as appropriate. Further, the capacitor element 2 is not limited to a film capacitor, and various capacitor elements such as a ceramic capacitor may be used. Regarding the shape, various shapes such as a columnar shape and a prismatic shape can be adopted.

DESCRIPTION OF SYMBOLS 1 Capacitor 2 Capacitor element 2a, 2b Electrode part 2c Flat part 2d Curved part 3 Element electrode plate (one polarity)
3a Substrate 3b Element connection piece 3c Electrode plate connection piece 4 Element electrode plate (the other polarity)
4a Substrate 4b Element connection piece 4c Electrode plate connection piece 5 External connection electrode plate (one polarity)
5a Body 5b External connection 5c Connection 5d Insertion hole 5e Avoidance 5f Through-hole 5g Input 6 External connection electrode plate (the other polarity)
6a body portion 6b external connection portion 6c connection portion 6d insertion hole 6e avoidance portion 6f through hole 6g input portion 7 case 7a case bottom portion 7b case side wall portion 7c opening 8 filling resin L1 length L2 of the body portion of the electrode plate for external connection Module group length W1 External connection electrode plate body width W2 Module group width

Claims (1)

A case (7) accommodates a capacitor element (2) having electrode portions (2a, 2b) at both ends and a pair of positive and negative electrode plates (5, 6) having external connection portions (5b, 6b). Capacitor,
A plurality of capacitor elements (2) are arranged with the electrode portions (2a, 2b) facing outward, and are connected for external connection via element electrode plates (3, 4) that commonly connect the capacitor elements (2). Connected to the electrode plates (5, 6),
The pair of positive and negative electrode plates for external connection (5, 6) are vertically overlapped above the capacitor element (2) and are connected to the element electrode plates (3, 4) with the main body portions (5a, 6a) respectively. The capacitor is characterized in that the external connection portions (5b, 6b) are respectively extended from the outer edges of the main body portions (5a, 6a).

Images