WO2023053811A1 - コンデンサ装置 - Google Patents

コンデンサ装置 Download PDF

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Publication number
WO2023053811A1
WO2023053811A1 PCT/JP2022/032312 JP2022032312W WO2023053811A1 WO 2023053811 A1 WO2023053811 A1 WO 2023053811A1 JP 2022032312 W JP2022032312 W JP 2022032312W WO 2023053811 A1 WO2023053811 A1 WO 2023053811A1
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WIPO (PCT)
Prior art keywords
electrode
terminal
capacitor
conductively connected
outer peripheral
Prior art date
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Ceased
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PCT/JP2022/032312
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English (en)
French (fr)
Japanese (ja)
Inventor
美成 櫻井
光 中川
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Rubycon Corp
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Rubycon Corp
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Priority to JP2023550471A priority Critical patent/JPWO2023053811A1/ja
Publication of WO2023053811A1 publication Critical patent/WO2023053811A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/008—Terminals
    • H01G9/012—Terminals specially adapted for solid capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/14—Structural combinations or circuits for modifying, or compensating for, electric characteristics of electrolytic capacitors

Definitions

  • the present invention relates to capacitor devices.
  • ESR Equivalent Solid electrolytic capacitors with low series resistance
  • ESL equivalent series inductance
  • Patent Document 1 by using the conductive member 22 formed by firing the conductive paste, a plurality of capacitors C can be easily connected in parallel while being partially embedded in the conductive member 22.
  • the state of conductive connection between the capacitor C and the conductive member 22 is likely to become unstable, and there is a risk that the bonding strength will decrease, resulting in an increase in ESR and ESL and a decrease in electrical reliability. be.
  • the cathode layer 15 of the capacitor element 10 and the cathode terminal 21 are bonded and fixed with the conductive adhesive 60 while being in direct contact with each other. Therefore, even after resin sealing with the sealing material 40, the conductive connection state is likely to become unstable due to changes in the external environment, and there is a risk that the adhesive strength will decrease. There is a possibility that electrical reliability may be lowered.
  • the present invention is intended to solve the above problems, and its object is to realize a capacitor device capable of improving electrical reliability by stabilizing the conductive connection state while suppressing ESR and ESL. to do.
  • the capacitor device of the present invention includes a body structure having a capacitor function, a first electrode (for example, a cathode) exposed on the outer peripheral surface of the body structure, and one end of the body structure.
  • a rod-shaped capacitor element having a second electrode (e.g., anode) protruding from, a first terminal conductively connected to the first electrode, and a second terminal conductively connected to the second electrode; and the first terminal extends in a circumferential direction at least partially along the outer peripheral surface of the body structure and is conductively connected to the first electrode in a manner that at least partially surrounds the first electrode.
  • the first terminal includes a plate-shaped conductor extending at least partially in the circumferential direction along the outer peripheral surface of the body structure and having a shape that at least partially surrounds the first electrode.
  • the first electrode and the plate-shaped conductor are electrically connected.
  • the plate-shaped conductor has a uniform thickness along the conductive connection range of the first electrode.
  • the first terminal is fixed to the first electrode via a conductive adhesive.
  • the first electrode and the plate-shaped conductor have a uniform interval (gap) along the outer peripheral surface and be fixed via the conductive adhesive having a uniform thickness.
  • the present invention preferably further comprises a third terminal conductively connected to the first electrode.
  • the third terminal extends in a circumferential direction at least partially along the outer peripheral surface of the body structure, and is conductively connected in a manner that at least partially surrounds the first electrode.
  • the present invention it is preferable to further include a third terminal conductively connected to the second electrode.
  • the third terminal is conductively connected to the second electrode projecting from the other end opposite to the one end.
  • the first electrode has the other end opposite to the one end and a portion exposed to the outer peripheral surface adjacent to the other end, and the first terminal has the Preferably, said portion of the first electrode is covered and electrically connected.
  • the first electrode is exposed over the entire other end portion and the entire circumference of the outer peripheral surface, and the first terminal is exposed over the entire other end portion and the outer peripheral surface. It is desirable to cover and electrically connect the first electrode over the entire circumference.
  • the second terminal is preferably conductively connected to the second electrode by welding or a conductive adhesive.
  • the second terminal extends in the circumferential direction at least partially along the outer peripheral surface of the second electrode and is conductively connected to the second electrode in a manner that at least partially surrounds the second electrode.
  • the second terminal includes a plate-shaped conductor extending at least partially in the circumferential direction along the outer peripheral surface of the body structure and having a shape at least partially surrounding the second electrode.
  • the second electrode and the plate-shaped conductor are electrically connected. At this time, it is preferable that the plate-shaped conductor has a uniform thickness along the conductive connection range of the second electrode.
  • the second terminal is fixed to the second electrode via a conductive adhesive.
  • the second electrode and the plate-like conductor are fixed with the conductive adhesive having a uniform thickness along the outer peripheral surface with a uniform gap therebetween.
  • the capacitor element preferably includes a plurality of body structures.
  • the plurality of main body structures be arranged in such a manner that the first electrodes are directly conductively connected to each other via a conductive adhesive.
  • the second terminal electrically connects the second electrodes of the plurality of body structures to each other.
  • the main body structure and base end portions of the terminals conductively connected to the respective electrodes of the main body structure are sealed with an electrically insulating resin material.
  • the first terminal extends in the circumferential direction at least partially along the outer peripheral surface of the body structure of the capacitor element, and conducts with the first electrode in a manner that at least partially surrounds the first electrode.
  • the conductive connection area between the first electrode provided on the outer peripheral surface of the main body structure and the first terminal can be increased, and the adhesive strength between the first electrode and the first terminal can be increased. Since it is possible to reduce the electrical resistance in the terminal structure and increase the terminal cross-sectional area, it is possible to suppress the ESR and ESL of the capacitor device and improve the electrical reliability.
  • end views (e) and (f) schematically showing modifications
  • Longitudinal sectional view (a) schematically showing the main structure of the seventh embodiment, longitudinal sectional view (b) schematically showing the main structure of the eighth embodiment, CC sectional arrow view (c), D It is a cross-sectional view (d) along -D and a cross-sectional view (e) schematically showing a modification.
  • Longitudinal cross-sectional view (a) schematically showing the main structure of the ninth embodiment, longitudinal cross-sectional view (b) schematically showing the main structure of the tenth embodiment, CC sectional arrow view (c), D It is a cross-sectional view (d) along -D and a cross-sectional view (e) schematically showing a modification.
  • FIG. 21 is a perspective view schematically showing the main structure of the twelfth embodiment with the sealing material partially omitted;
  • FIG. 1(a) is a perspective view schematically showing an example of the appearance of the main structure of the capacitor device 10.
  • the capacitor device 100 includes a capacitor body 11 corresponding to a body structure having a capacitor function, a first terminal 12 conductively connected to a first electrode (cathode) 11d provided on the outer peripheral surface of the capacitor body 11, and a capacitor body 11.
  • the second terminal 13 is, for example, provided integrally with the second electrode 11a with a wire having a conductive coating such as tin plating on the outermost periphery of a conductive material such as aluminum, iron, or copper. , is electrically connected to the second electrode 11a.
  • the capacitor body 11 includes a second axial electrode (anode) 11a extending in the axial direction at the center, and a dielectric (insulating film) 11b formed on the surface of the second electrode 11a.
  • a valve metal such as aluminum
  • chemical conversion treatment anodic oxidation treatment
  • An oxide film is formed by applying.
  • An electrolyte portion 11c having a function as an electrolyte such as a particulate solid electrolyte such as a conductive polymer and a functional liquid.
  • a first electrode (cathode) 11d made of conductive carbon or the like is formed on the electrolyte portion 11c.
  • the capacitor body 11 is configured in a cylindrical shape in the illustrated example. However, it may be configured in a prismatic shape as long as it is columnar or axial as a whole. Capacitor device 10 as a whole is configured in a shape extending in the axial direction, that is, in a rod shape. A first terminal 12 conductively connected to the first electrode 11d further protrudes in the axial direction from the other end of the capacitor body 11 . In the illustrated example, the first terminal 12 protrudes in the axial direction and then bends in a direction intersecting the axial direction, but is not particularly limited.
  • the first terminal 12 faces the first electrode 11d formed on the outer peripheral surface of the capacitor body 11 and surrounds the first electrode 11d, more specifically, encompasses (wraps) the first electrode 11d. It has a plate-shaped conductor portion 12 a formed in a shape and an axial terminal piece portion 12 b that is conductively connected to the plate-shaped conductor portion 12 a and protrudes from the capacitor body 11 .
  • the plate-shaped conductor portion 12a is composed of a cylindrical metal plate having the same thickness at the portion facing the first electrode 11d on the outer peripheral surface. At least a portion of the plate-shaped conductor portion 12a along the first electrode 11d is provided with a uniform interval from the first electrode 11d, and a conductive adhesive 15 such as silver paste is applied to the interval. By being filled, it is electrically connected to the first electrode 11 d and fixed to the capacitor body 11 . At this time, the portion of the conductive adhesive 15 filled in the gap has a uniform thickness.
  • the plate-shaped conductor portion 12a extends in the axial direction to the vicinity of one end of the capacitor body 11 from which the second terminal 13 protrudes, and covers most of the first electrode 11d forming the outer peripheral surface.
  • the plate-shaped conductor portion 12a is configured to cover the capacitor body 11 (the first electrode 11d, that is, the outer peripheral surface) over the entire circumference around the axis. be.
  • the first electrode 11d is formed not only on the outer peripheral surface of the capacitor body 11, but also on the other end opposite to the one end from which the second terminal 13 protrudes.
  • the plate-shaped conductor portion 12a of the first terminal 12 also includes a portion that covers the other end portion.
  • the terminal piece portion 12b protrudes in the axial direction from this portion.
  • the plate-shaped conductor portion 12a also has a uniform thickness at the portion on the other end, as described above, and is spaced uniformly from the surface of the other end.
  • the thickness of the conductive adhesive 15 filled in this gap is also configured to be uniform.
  • the third terminal 14 is conductively connected to the plate-like conductor portion 12a of the first terminal 12 at a substantially central portion in the axial direction of the capacitor body 11, and is provided as a shaft-like terminal piece portion so as to protrude to the outer peripheral side.
  • the plate-like conductor portion 12a, the terminal piece portion 12b, and the third terminal 14 of the first terminal 12 are integrally formed of metal parts.
  • the body structure of the capacitor body 11 is not particularly limited as long as it has a capacitor function.
  • a capacitor is mentioned.
  • Solid electrolytic capacitors are characterized by low ESR.
  • the solid electrolytic capacitor is desirably a solid electrolytic polymer capacitor using fine particles of conductive polymer together with a functional liquid.
  • general electrolytic capacitors, laminated ceramic capacitors, film capacitors, etc. may be used.
  • the capacitor main body 11 and the base end portions of the first terminal 12, the second terminal 13 and the third terminal 14 electrically connected to at least the first electrode 11d and the second electrode 11a are sealed. It is sealed with a stopper material 16 .
  • the sealing material 16 is made of an electrically insulating synthetic resin.
  • the end portions of the first terminal 12 , the second terminal 13 , and the third terminal 14 are exposed to the outside of the encapsulant 16 as terminal pieces projecting from the interior of the encapsulant 16 .
  • the plate-like conductor portion 12a of the first terminal 12 is conductively connected to at least the first electrode 11d formed on the outer peripheral surface of the capacitor body 11 (cylindrical portion in the illustrated example). extends around the axis (that is, in the circumferential direction) and is formed to at least partially surround the first electrode 11d, thereby increasing the conductive connection area between the first electrode 11d and the first terminal 12 Therefore, ESR can be suppressed, and ESL can also be suppressed. In particular, in this embodiment configured as a three-terminal capacitor, substantial ESL is even more suppressed. In addition, since the bonding strength between the first electrode 11d and the first terminal 12 can be increased, failures such as electrical open accidents can be avoided, and electrical reliability can be improved.
  • the portion of the plate-shaped conductor portion 12a that extends around the axis (that is, in the circumferential direction) and is formed so as to at least partially surround the first electrode has a uniform thickness;
  • the portion is provided with a uniform gap from the first electrode 11d, and the conductive adhesive 15 having a uniform thickness is interposed in this gap to fix the portion in a conductive connection state, thereby stabilizing the conductive connection portion. Since reliability and certainty can be further increased, reliability can be further improved.
  • the first terminal 22 covers only a portion of the first electrode 11d provided on the outer peripheral surface of the capacitor body 11, which is formed near the other end in the axial direction. formed in For this reason, the third terminal 24 is formed independently of the first terminal 22 so as to partially cover the first electrode 11 d in the central portion of the capacitor body 11 in the axial direction.
  • the third terminal 24 includes a plate-shaped conductor portion 24a and a terminal piece portion 24b, and the plate-shaped conductor portion 24a extends around the axis (circumferential direction) along the first electrode 11d.
  • the plate-like conductor portion 22a of the first terminal 22 encompasses the first electrode 11d over the entire axis, as in the previous embodiment.
  • the first terminal 22 and the third terminal 24 are conductively connected to the first electrode 11d at different locations, there is an advantage that the assembly work during manufacturing can be facilitated.
  • the third terminal 24 is configured to cover the first electrode 11d only in less than half of the angular range around the axis, it can be attached to the capacitor body 11 from the side, simplifying the assembly work.
  • the conductive connection area between the terminals 22 and 24 and the first electrode 11d is somewhat small, the size of each conductive connection area and the terminal position can be individually set, so the degree of freedom in design is increased. increases.
  • the first terminal 22 may be formed so as to surround only a part of the axis, and the third terminal 24 may be formed so as to surround the entire axis.
  • a capacitor device 300 of a third embodiment will be described with reference to FIG. 2(b). Since the third embodiment is the same as the second embodiment except for the shape and arrangement of the first terminals 32, the same parts are denoted by the same reference numerals, and the description thereof will be omitted.
  • This embodiment is the same as the previous embodiment in that the first terminal 32 of the capacitor element 30 has a plate-shaped conductor portion 32a and a terminal piece portion 32b. Consists only of a portion extending around the axis (circumferential direction) with respect to the first electrode 11d constituted by the outer peripheral surface, covers the other end of the capacitor body 11 as in the previous embodiment, and It differs in that it does not have a part to be electrically connected. Further, the plate-like conductor portion 32a of the first terminal 32 of this embodiment is not formed so as to cover the entire circumference of the axis similarly to the third terminal 24, and as shown in FIG. It is formed only on a portion of the terminal piece portion 32b side around the axis.
  • the present embodiment has the advantage that the first terminal 32 and the third terminal 24 can be separately set at different arbitrary locations in the axial direction or around the axis, and that the assembling work during manufacturing can be further facilitated.
  • the first terminal 32 may be formed so as to surround the entire axis, and the third terminal 24 may also be formed so as to surround the entire axis.
  • This embodiment is the same as the previous embodiment in that the third terminal 44 of the capacitor element 40 has a plate-shaped conductor portion 44a and a terminal piece portion 44b.
  • the difference is that the shaped conductor portion 44a extends around the axis (circumferential direction) over an angle range of more than half (180 degrees) around the axis, and covers the first electrode 11d so as to surround it.
  • the plate-like conductor portion 44a of the third terminal 44 covers the first electrode 11d over a half or more angular range around the axis, thereby allowing the third terminal 24 of the second embodiment to be easily connected from the side.
  • the attachment work is performed while ensuring a somewhat large conductive connection area and checking the filling condition of the conductive adhesive 15. have the advantage of being able to
  • the capacitor body 11' has a prismatic shape, and the plate-like conductor portion 44a is correspondingly formed so as to partially surround the rectangular cross section.
  • This embodiment is the same as the previous embodiment in that the first terminal 52 of the capacitor element 50 has a plate-shaped conductor portion 52a and a terminal piece portion 52b. Consists of only a portion extending around the axis (circumferential direction) with respect to the first electrode 11d constituted by the outer peripheral surface, covers the other end of the capacitor body 11 as in the fourth embodiment, and It differs in that it does not have a part to be electrically connected. Further, the plate-like conductor portion 52a of the first terminal 52 of this embodiment is not formed so as to cover the entire circumference of the axis line, similarly to the third terminal 44, and as shown in FIG. It is formed only on a portion of the terminal piece portion 52b side around the axis.
  • the present embodiment has the advantage that the first terminal 52 and the third terminal 44 can be separately set at different arbitrary locations in the axial direction or around the axial line, and that the assembling work during manufacturing can be further facilitated.
  • the plate-shaped conductor portion 52a of the first terminal 52 is configured to surround the first electrode 11d over a half or more angular range around the axis, it may be formed so as to surround the entirety around the axis. Alternatively, it may be formed so as to enclose only less than half the angular range around the axis.
  • the third terminal 44 may also be formed so as to surround the entire circumference of the axis, or may be formed so as to surround only less than half the angular range around the axis.
  • the capacitor body 11' has a prismatic shape
  • the plate-like conductor portions 44a and 52a are also configured to partially surround the prismatic cross-section correspondingly. may have been
  • a capacitor device 600 of a sixth embodiment will be described with reference to FIG.
  • a composite structure capacitor element 60 is formed in which a plurality of capacitor bodies 61 are conductively connected in parallel to a common first terminal 62, second terminal 63, and third terminal 64. Differs from the previous embodiment. However, since the capacitor main body 61 and the respective terminals 62, 63, 64 can be configured in the same manner as in the previous embodiment, the corresponding parts are denoted by the corresponding reference numerals, and the description thereof is omitted. .
  • each of the plurality of capacitor bodies 61 includes a second electrode 11a, a dielectric 11b, an electrolyte portion 11c, and a first electrode 11d.
  • a direct conductive connection is made via a conductive adhesive 65 such as silver paste that is formed.
  • the conductive adhesive 65 conductively connects the plate-like conductor portion 62a of the first terminal 62 and the plate-like conductor portion 64a of the third terminal 64 to the first electrode 11d in the same manner as in the previous embodiment.
  • the first terminal 62 and the third terminal 64 are configured to be directly conductively connected to the two lower capacitor bodies 61 as shown in 4(c). However, it is sufficient that the first terminal 62 and the third terminal 64 are conductively connected to at least one of the plurality of capacitor bodies 61 .
  • the second electrodes 11a respectively provided on the plurality of capacitor bodies 61 are configured to be conductively connected to the common terminal piece portion 63b by the plurality of connection piece portions 63a of the second terminals 63.
  • the shape of the second terminal 63 is shown in FIG. 4(b).
  • a stepwise connection mode two vertical stages as shown in FIG. 4 (e) and (f )
  • a frame-like connection form such as a connection piece portion 63a' or a radial connection form such as a connection piece portion 63a'' may be provided.
  • a plurality of capacitor bodies 61 are conductively connected in parallel to respective terminals 62, 63, 64, and other configurations are replaced with partial configurations as in the previous embodiments. I don't mind.
  • a prismatic capacitor body 61' is used, and a first terminal 62 having plate-shaped conductor portions 62a' and 64a' corresponding thereto, and A third terminal 64 may be used.
  • a large-capacity capacitor device 600 is configured while suppressing ESR and ESL by conductively connecting a plurality of capacitor bodies 61 in parallel through the first terminal 62, the second terminal 63, and the third terminal 64. can.
  • a capacitor device 700 of a seventh embodiment will be described with reference to FIG. 5(a).
  • individual constituent parts other than the internal structure of the capacitor body 71 and the terminal structure connected thereto can be configured in the same manner as in the previous embodiment, so corresponding parts are denoted by corresponding reference numerals. is omitted.
  • the second electrode 11a, the dielectric 11b, the electrolyte portion 11c, and the first electrode 11d are provided in the capacitor body 71 as in the previous embodiment.
  • the second electrode 11a penetrates in the axial direction, protrudes from both ends in the axial direction, and is conductively connected to the second terminal 73 and the third terminal 74, respectively.
  • the first terminal 72 is conductively connected to the first electrode 11d.
  • the first terminal 72 has a plate-shaped conductor portion 72a and a terminal piece portion 72b. As shown in FIG. 5(c), the plate-like conductor portion 72a is shaped to cover the entire circumference of the axis.
  • both the second terminal 73 and the third terminal 74 are conductively connected to the second electrode 11a, which simplifies the structure of the capacitor body 71 and reduces the manufacturing cost.
  • the manufacturing is further facilitated and the cost is reduced.
  • the first terminal 72 is conductively connected to the first electrode 11d, it is easier to increase the conductive connection area between the first electrode 11d and the first terminal 72. FIG. Thereby, ESR and ESL can be suppressed more easily.
  • the capacitor body 71' has a prismatic shape, and the plate-like conductor portion 72a' of the first terminal 72 also has a partially rectangular cross section corresponding to this. It may be covered in an enclosing manner.
  • the capacitor device 800 of the eighth embodiment will be described with reference to FIG. 5(b).
  • individual components other than the structure of the first terminal 82 can be configured in the same manner as in the seventh embodiment.
  • the plate-shaped conductor portion 82a of the first terminal 82 surrounds the first electrode 11d only in a partial angular range around the axis of the capacitor body 71, thereby forming a conductive connection. It is different from the seventh embodiment in that Also in this embodiment, as shown in FIG. 5(e), the capacitor body 71' has a prismatic shape, and the plate-like conductor portion 82a' of the first terminal 82 also has a partially rectangular cross section corresponding to this. It may be covered in an enclosing manner.
  • a capacitor device 900 of a ninth embodiment will be described with reference to FIG. 6(a).
  • individual components other than the structures of the second electrode 91a, the second terminal 93 and the third terminal 94 can be configured in the same manner as in the seventh embodiment or the eighth embodiment.
  • the same reference numerals are given, and the description thereof is omitted.
  • the second electrodes 91a protrude on both sides of the capacitor body 91 in the axial direction and are conductively connected to the second terminal 93 and the third terminal 94, respectively.
  • the second terminal 93 and the third terminal 94 each have plate-like conductor portions 93a and 94a along the outer peripheral surface of the end portion 91s of the second electrode 91a projecting from both end portions of the capacitor body 91.
  • These plate-shaped conductor portions 93a and 94a are configured to extend around the axis along the outer peripheral surface of the corresponding end portion 91s of the second electrode 91a and surround the outer peripheral surface.
  • the end portion 91s of the second electrode 91a and the plate-like conductor portions 93a and 94a are conductively connected and fixed by a conductive adhesive such as silver paste, or are in direct contact with each other and conductively connected. It may be fixed by welding or the like.
  • the plate-shaped conductor portions 93a and 94a are placed at the end portions of the second electrode 91a. It is preferred to have the same thickness along the outer circumference of 91s. Moreover, it is preferable that the plate-shaped conductor portions 93a and 94a have the same distance (gap) between them and the second electrode 91a along the outer peripheral surface of the end portion 91s of the second electrode 91a. At this time, the gap is filled with a conductive adhesive (not shown) having a uniform thickness.
  • the plate-shaped conductor portions 93a and 94a are formed along the outer peripheral surface of the end portion 91s of the second electrode 91a. It is preferable that it has a thickness and is formed tightly so as not to have a gap between it and the end portion 91s of the second electrode 91a.
  • the plate-shaped conductor portions 93a and 94a face only a partial angle range around the axis of the end portion 91s of the second electrode 91a, and are electrically conductive adhesive (not shown).
  • An electrically conductive connection is made by an adhesive or by a fixation such as welding. More specifically, the angular range around the axis of the plate-shaped conductor portions 93a and 94a surrounding the end portion 91s is less than half (180 degrees). Note that, as shown in FIG.
  • the capacitor body 91 may be prismatic, and the end 91s of the second electrode 91a may be prismatic or plate-like, and the second terminal 93, the second The plate-shaped conductor portions 93a' and 94a' of the three-terminal 94 may have a shape corresponding to this.
  • the end portion 91s of the second electrode 91a is configured to increase the conductive connection area with the plate-shaped conductor portions 93a and 94a and to enhance the stability of the conductive connection portion. It is preferably configured to have a larger diameter or larger cross section than the second electrode 11a. In the illustrated example, the end portion of the second electrode 91a does not have a smaller diameter or a smaller cross section than the second electrode 11a as in the first embodiment. The portion of the second electrode 91a and the end portion 91s have the same diameter or the same cross section. However, the end portion 91s may be configured to have a larger outer diameter or a larger cross section than the portion of the second electrode 91a inside the capacitor body 91 .
  • the second electrodes 91a protrude on both sides in the axial direction of the capacitor body 91 and are conductively connected to the second terminal 103 and the third terminal 104, respectively.
  • the second terminal 103 and the third terminal 104 each have plate-shaped conductor portions 93a and 94a along the outer peripheral surfaces of both end portions 91s of the second electrode 91a. Similar to morphology.
  • the plate-shaped conductor portions 103a and 104a face only a partial angle range around the axis with respect to the outer peripheral surface of the end portion 91s of the second electrode 91a,
  • the conductive connection is made by a conductive adhesive or by fixing such as welding.
  • the angular range around the axis of the plate-shaped conductors 103a and 104a surrounding the end 91s is half (180 degrees) or more, or larger than that.
  • the angular range of the plate-shaped conductor portions 103a and 104a may be a range covering the entire circumference of the axis. Further, as shown in FIG.
  • the capacitor body 91' may have a prismatic shape, and furthermore, the end portion 91s' of the second electrode 91a may be prismatic or plate-like, and the plate-like conductor portion Plate-shaped conductor portions 103a' and 104a' of 103 and third terminal 104 may have corresponding shapes.
  • a capacitor device 1100 of an eleventh embodiment will be described with reference to FIG.
  • This embodiment differs from the previous embodiment in that a composite capacitor element 110 is formed in which a plurality of capacitor bodies 111 are conductively connected in parallel to a common first terminal 112, second terminal 113, and third terminal 114.
  • individual constituent parts can be configured in the same manner as in the seventh to tenth embodiments, so corresponding parts are denoted by corresponding reference numerals and descriptions thereof are omitted.
  • each of the plurality of capacitor bodies 111 includes a second electrode 11a, a dielectric 11b, an electrolyte portion 11c, and a first electrode 11d.
  • a direct conductive connection is made via a conductive adhesive 65, such as silver paste, formed thereon.
  • the conductive adhesive 65 electrically connects the plate-shaped conductor portion 112a of the first terminal 112 to the first electrode 11d in the same manner as in the previous embodiment.
  • the second electrodes 11a respectively provided on the plurality of capacitor bodies 111 penetrate in the axial direction, and are conductively connected to the second terminal 113 and the third terminal 114 at both ends in the axial direction.
  • the second electrode 11 a is configured to be conductively connected to a common terminal piece portion 113 b by a plurality of connection piece portions 113 a of the second terminal 113 .
  • the shape of the second terminal 113 is shown in FIG. 7(b).
  • the second terminal 113 is configured to conductively connect the plurality of second electrodes 11a to the common terminal piece portion 113b, a stepwise connection mode (two vertical stages) as shown in FIG. are first conductively connected, and then the vertical two-tiered connection set is further horizontally conductively connected), and is not limited to the embodiment shown in FIGS.
  • a frame-like connection form such as the connection piece portion 113a' or a radial connection form such as the connection piece portion 113a'' may be provided.
  • a plurality of capacitor bodies 111 are conductively connected in parallel with respective terminals 112, 113, and 114, and other configurations are replaced with partial configurations as in the previous embodiments. I don't mind.
  • a prismatic capacitor body 111' instead of the capacitor body 111, a prismatic capacitor body 111' may be used, and a second terminal 112 having a corresponding plate-shaped conductor portion 112a' may be used. good.
  • a plurality of capacitor bodies 111 are conductively connected in parallel by first terminal 112, second terminal 113, and third terminal 114, thereby suppressing ESR and ESL and configuring large-capacity capacitor device 1100. can.
  • a capacitor device 1200 of a twelfth embodiment will be described with reference to FIGS. 8 and 9(a).
  • This embodiment is similar to the previous embodiment in that a capacitor body 121 is formed with a capacitor element 120 conductively connected to a first terminal 122, a second terminal 123, and a third terminal 124, but the surface It differs in that it is configured as a mounting type chip.
  • individual components of the capacitor body 121 can be configured in substantially the same manner as in the seventh to tenth embodiments, corresponding parts are denoted by corresponding reference numerals, and descriptions thereof are omitted.
  • the capacitor body 121 comprises a second electrode 121a, a dielectric 121b, an electrolyte portion 121c, and a first electrode 121d
  • the first electrode 121d is a conductive material such as silver paste formed thereon. It is conductively connected to the first terminal 122 via an adhesive 125 .
  • the first terminal 122 has a plate-shaped conductor portion 122a having an arcuate cross section and a plate-shaped terminal piece portion 122b electrically connected to each other.
  • the conductive adhesive 125 electrically connects the plate-shaped conductor portion 122a of the first terminal 122 to the first electrode 121d in the same manner as in the seventh embodiment.
  • the plate-like conductor portion 122a is configured integrally with the terminal piece portion 122b, or is conductively connected to the terminal piece portion 122b.
  • the second terminals 123 and the third terminals 124 are connected to the second electrodes 121a projecting from both ends of the capacitor body 121, respectively.
  • the second terminal 123 and the third terminal 124 are conductively connected to the plate-like terminal pieces 123b and 124b via the plate-like conductor blocks 123a and 124a.
  • the reason why the plate-shaped conductor blocks 123a and 124a are interposed is that the second electrode 121a projects higher than the first electrode 121d.
  • the plate-shaped conductor blocks 123a and 124a are connected to the second electrode 121a in a conductive connection structure like the plate-shaped conductor portions 93a, 94a, 103a and 104a to the end portion 91s of the ninth and tenth embodiments. may be configured.
  • the plate-shaped conductor portion 122a extends around the axis along the first electrode 121d provided on the outer peripheral surface of the capacitor body 121, and covers the first electrode 121d so as to surround it. At this time, the thickness of the plate-like conductor portion 122a is preferably uniform along the first electrode 121d. It is desirable that the thickness of the second terminal 113 and the third terminal 114 be uniform.
  • a surface mount type (chip type) ) can be constructed.
  • the capacitor element 130 has the same structure as the capacitor element 10 of the first embodiment.
  • a second electrode 131a protrudes from one end of the capacitor body 131 and is conductively connected to the second terminal 123 shown in FIG.
  • a first electrode 131d is provided on the outer peripheral surface of the capacitor body 131.
  • the first electrode 131d protrudes from the other end through the first intermediate terminal 132 and is electrically connected to the first terminal 124 shown in FIG. be done.
  • 124 is the third terminal, but in this embodiment, the first terminal 124 constitutes the first terminal according to the present invention together with the first intermediate terminal 132 .
  • the first intermediate terminal 132 has a plate-shaped conductor portion 132a and a terminal piece portion 132b.
  • the plate-shaped conductor portion 132a is conductively connected to the first electrode 131d via a conductive adhesive 125.
  • the plate-shaped conductor portion 132a can be configured in the same manner as the plate-shaped conductor portion 12a of the first embodiment.
  • the plate-like conductor portion 132a replaces the plate-like conductor portion 122a shown in FIG. 8, and is configured integrally with the terminal piece portion 122b or electrically connected to the terminal piece portion 122b.
  • the capacitor element 140 has the same structure as the capacitor element 20 of the second embodiment.
  • a second electrode 141a protrudes from one end of the capacitor body 141 and is conductively connected to the second terminal 123 shown in FIG.
  • a first electrode 141d is provided on the outer peripheral surface of the capacitor body 141.
  • the first electrode 141d protrudes from the other end through the first intermediate terminal 142 and is electrically connected to the first terminal 124 shown in FIG.
  • 124 is the third terminal, but in this embodiment, the first terminal 124 constitutes the first terminal according to the present invention together with the first intermediate terminal 142 .
  • the first intermediate terminal 142 has a plate-shaped conductor portion 142a and a terminal piece portion 142b.
  • the plate-like conductor portion 142a is conductively connected to the first electrode 141d via a conductive adhesive 125.
  • the plate-like conductor portion 142a can be configured in the same manner as the plate-like conductor portion 22a of the second embodiment.
  • the first electrode 121d of the capacitor body 141 is conductively connected to the plate-like conductor portion 122a of the third terminal 122 shown in FIG. is conductively connected to
  • the first terminal 12 extends at least partially in the circumferential direction along the outer peripheral surface of the capacitor body (body structure) 11, and surrounds the first electrode 11d at least partially.
  • the conductive connection area between the first electrode 11d provided on the outer peripheral surface of the capacitor body 11 and the first terminal 12 can be increased, and the first electrode 11d and the first terminal 12 can be electrically connected. Since the adhesive strength between the 1 terminal 12 can be increased, the electrical resistance in the terminal structure can be reduced, and the terminal cross-sectional area can be increased, so the ESR and ESL of the capacitor device can be suppressed, and the electrical reliability performance can be improved.
  • the first terminal 12 extends at least partially in the circumferential direction along the outer peripheral surface of the capacitor body 11, and is a plate-shaped conductor having a shape that at least partially surrounds the first electrode 11d.
  • the portion 12a and conductively connecting the first electrode 11d and the plate-shaped conductor portion 12a it is possible to further reduce the conductive connection resistance between the first electrode 11d and the first terminal 12, and to achieve the conductive connection. Since the adhesive strength and mechanical stability of the part can be increased, it is possible to further suppress ESR and ESL and further improve reliability.
  • the plate-shaped conductor portion 12a has a uniform thickness along the first electrode 11d, so that the adhesive strength and adhesive structure of the conductive connection portion along the surface of the first electrode 11d are further uniformed. Therefore, it is possible to further improve the structural stability of the conductive connection part, so that it is possible to suppress the deterioration of the electrical characteristics due to thermal shock or electrical shock, and to further improve reliability. can be done.
  • the first terminal 12 is fixed to the first electrode 11d via a conductive adhesive 15, and the first electrode 11d and the plate-shaped conductor portion 12a are spaced uniformly along the outer peripheral surface. , and is fixed via the conductive adhesive 15 having a uniform thickness, so that the adhesive strength and adhesive structure of the conductive connection portion along the surface of the first electrode 11d are further uniformized. Since the structural stability of the conductive connection portion can be further enhanced, deterioration of electrical characteristics due to thermal shock or electrical shock can be suppressed, and reliability can be further enhanced.
  • the structural uniformity along the conductive contact surface in the conductive connection portion of each electrode and each terminal is higher, so local stress concentration is less likely to occur.
  • deformation, shrinkage, peeling, displacement, etc. of the conductive connection are suppressed when thermal or electrical impact is applied, so the stability of the conductive connection is improved and electrical reliability is enhanced.
  • the plate-shaped conductor portion is made of an elastically deformable conductive material such as a metal plate, the thermal, electrical, and mechanical loads received from the outside can be released, so the reliability of the conductive connection portion can be further improved. can be improved.
  • each embodiment further comprises third terminals 14, 24, 44, 64 conductively connected to the first electrode 11d, the third terminals 14, 24, 44, 64
  • the first electrode 11d and the third terminals 14, 24, 44, 64 are conductively connected in a manner that extends at least partially along the surface in the circumferential direction and at least partially surrounds the first electrode 11d. Since the conductive connection area between them and the bonding strength can also be increased, it is possible to further suppress ESR and ESL with the added effect of a three-terminal capacitor, and improve reliability.
  • Each embodiment further comprises third terminals 74, 94, 104, 114, 124 conductively connected to the second electrodes 11a, 121a, the third terminals 74, 94, 104, 114, 124
  • the conductive connection area and adhesive strength are increased, and the effect of making it a three-terminal capacitor is also added.
  • the ESR and ESL can be further suppressed, and the three-terminal capacitor can be configured with a simple structure, so that the reliability can be further improved.
  • the first electrodes 11d, 131d, and 141d have the other end opposite to the one end and a portion exposed to the outer peripheral surface adjacent to the other end. 12, 22, 132, 142 cover and conductively connect said portions of the first electrodes 11d, 131d, 141d to provide a contact between the first electrodes 11d, 131d, 141d and the first terminals 12, 22, 132, 142. Since it is possible to further increase the conductive connection area and the adhesive strength of , ESR and ESL can be further suppressed, and reliability can be further improved.
  • the first electrodes 11d, 131d, and 141d are exposed over the entire other end and the entire circumference of the outer peripheral surface, and the first terminals 12, 22, 132, and 142 are exposed over the entire other end and , the first electrodes 11d, 131d, and 141d are covered over the entire circumference of the outer peripheral surface, so that the effect can be further enhanced.
  • the second terminals 93, 94, 103, 104 are conductively connected to the second electrode 91a by welding or a conductive adhesive, and the second terminals 93, 94, 103, 104 are connected to the second electrode 91a. It extends in the circumferential direction at least partially along the outer peripheral surface of the end portion 91s of the electrode 91a, and is conductively connected to the second electrode 91a in a manner that at least partially surrounds the end portion 91s of the second electrode 91a. , ESR and ESL can be further suppressed, and reliability can be further enhanced.
  • each embodiment includes a plurality of capacitor bodies 61 and 111, and the plurality of capacitor bodies 61 and 111 are arranged in such a manner that the first electrodes 11d are directly conductively connected to each other via a conductive adhesive 65. Since the second terminals 63 and 113 can further increase the conductive connection area by electrically connecting the second electrodes 11a of the plurality of capacitor bodies 61 and 111 to each other, the plurality of capacitor bodies can be connected in parallel. By connecting, it is possible to increase the capacity while suppressing ESR and ESL.
  • the first terminals 72, 82, 92, and 122 conductively connected to the first electrodes 11d and 121d are grounded.
  • the increased conductive connection area and improved adhesion stability reduce the series resistance and inductance on the ground side. high effect can be obtained.
  • the cross-sectional area of the conductor connecting portion on the ground side is large, it is possible to keep the impedance low.
  • the conductive connection between each electrode and each terminal is stabilized and reliability is improved.
  • the sealing material in the conductive connection portion between each electrode and the plate-shaped conductor, the sealing material further improves the adhesion strength and stabilizes the conductive connection state due to the increase in the conductive connection area and the uniform structure along the electrode surface. Because of the enhancement, the electrical reliability is greatly improved.
  • the capacitor device of the present invention is not limited to the illustrated examples described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
  • the features of each structural portion in each of the above embodiments can be replaced with existing structures or newly added in other embodiments, unless there is a particular problem. , can be suitably employed in any combination.
  • the surface of the first electrode or the second electrode and the facing surface of the conductive connection portion with the plate-shaped conductor portion of the first terminal, the second terminal, or the third terminal are cylindrical surfaces or Although it is planar, it may have any surface shape. However, it is preferable to have a curved (curved) shape or a flat shape, and if there are places where different surface shapes are connected, in order to prevent stress concentration and avoid problems with the conductive connection, It is preferable that the different surface shapes are smoothly connected.
  • the capacitor elements 60 and 110 including four capacitor bodies (body structures) 61 and 111 are exemplified in the illustrated examples, but two or three capacitor bodies are included. It may be a structure, or a structure including five or more capacitor bodies. However, in any case, it is preferable that the capacitor bodies are arranged in a uniform manner. Further, the capacitor bodies are not limited to having the same shape and the same size as each other, and may include capacitor bodies having different shapes and sizes from each other.
  • one of the first electrode and the second electrode to which two of the first terminal, the second terminal, and the third terminal are conductively connected is taken as one electrode.
  • two or more of the remaining terminals may be provided to be conductively connected to the other electrode.
  • two second terminals 13 and 63 are provided in the third, fifth and sixth embodiments, and the first terminal is provided in the seventh, eighth, ninth, tenth, eleventh and twelfth embodiments.
  • Two or more terminals 72, 82, 92, 112, 122 are provided.

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JPS5486651U (https=) * 1977-12-02 1979-06-19
JPH05251288A (ja) * 1992-03-06 1993-09-28 Nec Corp 表面実装用ヒューズ内蔵三端子型固体電解コンデンサ
JP2004281749A (ja) * 2003-03-17 2004-10-07 Nippon Chemicon Corp 固体電解コンデンサ
JP2008235410A (ja) * 2007-03-19 2008-10-02 Matsushita Electric Ind Co Ltd 固体電解コンデンサ
WO2018142972A1 (ja) * 2017-01-31 2018-08-09 パナソニックＩｐマネジメント株式会社 固体電解コンデンサ

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JP4613669B2 (ja) * 2004-12-06 2011-01-19 パナソニック株式会社 固体電解コンデンサ
JP4739982B2 (ja) * 2005-03-28 2011-08-03 三洋電機株式会社 固体電解コンデンサの製造方法
JP4802585B2 (ja) * 2005-07-22 2011-10-26 パナソニック株式会社 固体電解コンデンサ
JP4645490B2 (ja) * 2006-03-16 2011-03-09 日本電気株式会社 高周波フィルタ
JP2009239203A (ja) * 2008-03-28 2009-10-15 Tdk Corp 固体電解コンデンサ
JP5094598B2 (ja) * 2008-07-08 2012-12-12 ルビコン株式会社 キャパシタ
JP2011035084A (ja) * 2009-07-31 2011-02-17 Sanyo Electric Co Ltd 固体電解コンデンサ
JP5484922B2 (ja) * 2010-01-15 2014-05-07 三洋電機株式会社 固体電解コンデンサ
JP2011233661A (ja) * 2010-04-27 2011-11-17 Panasonic Corp 固体電解コンデンサ

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Publication number Priority date Publication date Assignee Title
JPS5445348U (https=) * 1977-09-06 1979-03-29
JPS5486651U (https=) * 1977-12-02 1979-06-19
JPH05251288A (ja) * 1992-03-06 1993-09-28 Nec Corp 表面実装用ヒューズ内蔵三端子型固体電解コンデンサ
JP2004281749A (ja) * 2003-03-17 2004-10-07 Nippon Chemicon Corp 固体電解コンデンサ
JP2008235410A (ja) * 2007-03-19 2008-10-02 Matsushita Electric Ind Co Ltd 固体電解コンデンサ
WO2018142972A1 (ja) * 2017-01-31 2018-08-09 パナソニックＩｐマネジメント株式会社 固体電解コンデンサ

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