WO2025022776A1 - コンデンサモジュール - Google Patents

コンデンサモジュール Download PDF

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Publication number
WO2025022776A1
WO2025022776A1 PCT/JP2024/018525 JP2024018525W WO2025022776A1 WO 2025022776 A1 WO2025022776 A1 WO 2025022776A1 JP 2024018525 W JP2024018525 W JP 2024018525W WO 2025022776 A1 WO2025022776 A1 WO 2025022776A1
Authority
WO
WIPO (PCT)
Prior art keywords
bus bar
capacitor
electrode
capacitor module
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/018525
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
将大 飯田
悠暉 小島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Shizuki Electric Co Inc
Original Assignee
Murata Manufacturing Co Ltd
Shizuki Electric Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd, Shizuki Electric Co Inc filed Critical Murata Manufacturing Co Ltd
Priority to JP2025535589A priority Critical patent/JPWO2025022776A1/ja
Publication of WO2025022776A1 publication Critical patent/WO2025022776A1/ja
Anticipated expiration legal-status Critical
Pending 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
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/10—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations

Definitions

  • This disclosure relates to a capacitor module.
  • a capacitor module is known that has a capacitor element housed in a case and a bus bar connected to the capacitor element.
  • Patent Document 1 discloses a capacitor busbar structure having a capacitor element, a first busbar, a second busbar, an insulator, and a molded resin.
  • the capacitor in Patent Document 1 has the problem that it is difficult to reduce inductance.
  • This disclosure provides a capacitor module that can reduce inductance.
  • a capacitor module includes: One or more capacitor elements each having a pair of electrodes and a side surface connecting the pair of electrodes; a bus bar electrically connected to one of the pair of electrodes; a case that accommodates the one or more capacitor elements and a portion of the bus bar; a sealing resin that is filled in the case and seals the one or more capacitor elements and a portion of the bus bar; Equipped with the bus bar has a contact portion in contact with the electrode and extending in a first direction, an extension portion disposed along the side surface and extending in a second direction intersecting the first direction, and a connection portion connecting the contact portion and the extension portion, The connection portion has at least one of a first portion extending from an end of the contact portion so as to be away from the electrode in the second direction, or a second portion extending from an end of the extension portion so as to be away from the side surface in the first direction.
  • FIG. 1 is a cross-sectional view showing a capacitor module according to a first embodiment.
  • FIG. 2 is a perspective view showing a capacitor element included in the capacitor module of FIG. 1 .
  • FIG. 1 is a cross-sectional view showing a capacitor module according to a first modified example of the first embodiment.
  • FIG. 11 is a cross-sectional view showing a capacitor module according to a second modified example of the first embodiment.
  • FIG. 11 is a cross-sectional view showing a capacitor module according to a second embodiment.
  • FIG. 11 is a cross-sectional view showing a capacitor module according to a third embodiment.
  • FIG. 8 is an enlarged view of region R4 in FIG. 7 .
  • two bus bars are arranged to face each other.
  • a pair of opposing plate portions of both bus bars are arranged to face each other in close proximity.
  • the electric field generated by the current flowing through the capacitor element and the electric field generated by the current flowing through the bus bar can be cancelled out, further reducing the inductance of the capacitor module.
  • busbar could be bent at an approximately right angle, it would be possible to bring the busbar close to both the electrodes of the capacitor element and the side of the capacitor element.
  • the busbar is made of a thin metal plate, localized corners may become rounded when the busbar is bent. When the corners are rounded, it is difficult to bring the busbar into contact with the electrodes of the capacitor element and also to bring the busbar close to the side of the capacitor element.
  • the inventors have investigated a busbar structure that allows the busbar to contact the electrodes of the capacitor element and to be placed close to the side of the capacitor element, resulting in the following disclosure.
  • FIG. 1 is a cross-sectional view showing a capacitor module 100 according to a first embodiment.
  • Fig. 2 is a perspective view showing a capacitor element 10 included in the capacitor module 100 of Fig. 1. Note that the X, Y, and Z directions in the figure respectively indicate the horizontal, vertical, and height directions of the capacitor module 100.
  • the capacitor module 100 includes a capacitor element 10, a bus bar 20, a case 30, and a sealing resin 40.
  • the capacitor module 100 is formed by housing the capacitor element 10 and a portion of the bus bar 20 in the case 30 and sealing the case 30 with the sealing resin 40 that fills the case 30.
  • Capacitor element 10 is a film capacitor composed of a laminate of dielectric films. More specifically, capacitor element 10 is formed by stacking dielectric films having metal deposition films formed on their surfaces, and then rolling or laminating them. In this embodiment, the roll of dielectric films is pressed into a flat shape, so that capacitor element 10 is formed into a columnar shape having an oval cross section.
  • the dielectric film for example, a dielectric film formed from a mixed resin solution containing phenoxy resin and MDI (diphenylmethane diisocyanate) can be used.
  • a dielectric film formed from a mixed resin solution containing polyvinyl acetoacetal (PVAA) and tolylene diisocyanate (TDI) may be used.
  • PVAA polyvinyl acetoacetal
  • TDI tolylene diisocyanate
  • the glass transition point of the dielectric film can be made 120°C or higher, and the heat resistance of the capacitor module can be improved.
  • metal vapor deposition film formed on the surface of the dielectric film for example, metals such as Al and Zn can be used.
  • a pair of electrodes 11, 12 are formed on both ends of the dielectric film laminate of the capacitor element 10 for electrical connection to the bus bar 20.
  • one of the pair of electrodes 11, 12 may be referred to as the first electrode 11 and the other as the second electrode 12.
  • the electrodes 11, 12 can be formed, for example, by spraying a metal (conductive material) such as Al or Zn.
  • the capacitor element 10 has a side surface 13 that connects a pair of electrodes 11, 12.
  • the capacitor element 10 is formed in a columnar shape having an oval cross section, so that the side surface 13 of the capacitor element 10 includes a pair of flat portions 13a and a pair of curved portions 13b that connect the pair of flat portions 13a.
  • the case 30 is a case for housing the capacitor element 10.
  • the case 30 has, for example, a substantially rectangular parallelepiped shape and has an opening 31 that exposes a portion of the bus bar 20.
  • the capacitor element 10 is housed in the case 30.
  • the capacitor element 10 is disposed inside the case 30 such that the electrodes 11, 12 face a side wall 32 of the case 30 and the flat portion 13a of the side surface 13 faces a bottom wall 33 and the opening 31 of the case.
  • a portion of the bus bar 20 is also housed in the case 30.
  • the case 30 is formed from synthetic resins such as polyphenylene sulfide (PPS resin) and polybutylene terephthalate (PBT resin).
  • PPS resin polyphenylene sulfide
  • PBT resin polybutylene terephthalate
  • the sealing resin 40 is filled into the case 30 to seal the capacitor element 10 and a part of the bus bar 20 housed in the case 30.
  • the sealing resin 40 is made of a thermosetting resin such as an epoxy resin or a urethane resin. A material having high fluidity and adhesiveness may be used as the material of the sealing resin 40.
  • the bus bar 20 is connected to one of the pair of electrodes 11, 12 of the capacitor element 10.
  • the bus bar 20 may be formed, for example, from a metal plate having electrical conductivity.
  • the bus bar 20 includes a first bus bar 21 connected to the first electrode 11 and a second bus bar 26 connected to the second electrode 12.
  • the first bus bar 21 has a contact portion 22, an extension portion 23, and a connection portion 24.
  • the first bus bar 21 also has a terminal portion 21a that is exposed to the outside of the case 30.
  • the contact portion 22 contacts one of the first electrodes 11 of the capacitor element 10 and extends in the first direction (Z direction).
  • the contact portion 22 electrically connects the first bus bar 21 and the first electrode 11 of the capacitor element 10.
  • the extension portion 23 is disposed along the side surface 13 of the capacitor element 10 and extends in a second direction (X direction) intersecting the first direction (Z direction).
  • the extension portion 23 is disposed along the flat portion 13a of the side surface 13 of the capacitor element 10.
  • the extension portion 23 is preferably disposed in contact with the flat portion 13a of the capacitor element 10.
  • connection portion 24 is a portion that connects the contact portion 22 and the extension portion 23.
  • the connection portion 24 has a first portion 24a that extends from the end portion 22a of the contact portion 22 so as to be separated from the first electrode 11 in the second direction (X direction).
  • the connection portion 24 has a third portion 24b that extends between the first portion 24a and the extension portion 23 so as to approach the electrode 11 in the second direction (X direction).
  • the first portion 24a extends from the end portion 22a of the contact portion 22 in the direction of arrow D1.
  • the third portion 24b extends from the first portion 24a toward the extension portion 23 in the direction of arrow D2.
  • the connection portion 24 is disposed away from the first electrode 11.
  • both the contact portion 22 and the extending portion 23 can be brought into contact with the capacitor element 10.
  • the bus bar 20 is formed of a metal plate, it is difficult to bend the bus bar 20 at a right angle so that it can contact both the first electrode 11 and the flat portion 13a of the capacitor element 10.
  • connection portion 24 by arranging the connection portion 24, it is possible to prevent the corner portion c1 of the capacitor element 10 and the first bus bar 21 from interfering with each other. Therefore, it is possible to prevent a gap from being generated between the capacitor element 10 and the first bus bar 21 and to bring both the contact portion 22 and the extending portion 23 into contact with the capacitor element 10.
  • connection portion 24 is formed to be curved.
  • the connection portion 24 being curved means that the connection portion 24 is bent in an arch shape. Therefore, the connection portion 24 functions as a spring and can absorb the dimensional tolerance between the capacitor element 10 and the first bus bar 21. This ensures that the contact portion 22 and the first electrode 11, and the extension portion 23 and the flat portion 13a, are in contact with each other, thereby reducing the inductance of the capacitor module 100.
  • connection portion 29 of second bus bar 26 has first portion 29a extending from end 27a of contact portion 27 so as to be spaced apart in the second direction (X direction) relative to second electrode 12. Furthermore, in this embodiment, connection portion 29 has third portion 29b extending between first portion 29a and extension portion 28 so as to approach electrode 1 in the second direction (X direction).
  • First portion 29a extends from end 27a of contact portion 27 in the direction of arrow D3.
  • Third portion 29b extends from first portion 29a toward extension portion 28 in the direction of arrow D4. In this embodiment, the connection portion 29 is positioned away from the second electrode 12.
  • the terminal portion 21a of the first bus bar 21 and the terminal portion 26a of the second bus bar 26 are arranged so as to overlap.
  • An insulator (not shown) is arranged between the terminal portion 21a and the terminal portion 26a.
  • the capacitor module 100 includes a capacitor element 10, a bus bar 20, a case 30, and a sealing resin 40.
  • the capacitor element 10 has a pair of electrodes 11, 12, and a side surface 13 connecting the pair of electrodes 11, 12.
  • the bus bar 20 is electrically connected to one of the pair of electrodes 11, 12.
  • the case 30 accommodates the capacitor element 10 and a portion of the bus bar 20.
  • the sealing resin 40 fills the case 30 and seals the capacitor element 10 and a portion of the bus bar 20.
  • the bus bar 20 has contact portions 22, 27, extension portions 23, 28, and connection portions 24, 29.
  • the contact portions 22, 27 contact the electrodes 11, 12 and extend in a first direction.
  • the extension portions 23, 28 are arranged along the side surface 13 and extend in a second direction intersecting the first direction.
  • the connection parts 24, 29 connect the contact parts 22, 27 and the extension parts 23, 28.
  • the connection part 24 has a first part 24a that extends from the end part 22a of the contact part 22 so as to be separated from the electrode 11 in the second direction
  • This configuration allows the bus bar 20 to be in contact with the electrodes 11 and 12 of the capacitor element 10 while also being close to the side of the capacitor element 10. This makes it possible to provide a capacitor module 100 with reduced inductance.
  • connection portion 24 has a third portion 24b between the first portion 24a and the extension portion 23, which extends toward the electrode 11 in the second direction.
  • This configuration absorbs the dimensional tolerances between the capacitor element 10 and the busbar 20, making it easier for the busbar 20 to come into contact with the electrode 11 and the side surface 13.
  • connection portion 24 is curved.
  • connection parts 24, 29 to function as springs, making it easier to bring the bus bar 20 into contact with the electrode 11 and the side surface 13.
  • the extensions 23, 28 are in contact with the side surface 13 of the capacitor element 10.
  • This configuration can enhance the effect of reducing inductance. Furthermore, even if the dimensional accuracy of the capacitor element 10 is low, it is possible to ensure that the bus bar 20 and the electrodes 11 and 12 are in contact with each other, and that the bus bar 20 and the side surface 13 are reliably aligned.
  • the busbar 20 includes a first busbar 21 electrically connected to one of the pair of electrodes 11, 12, the first electrode 11, and a second busbar 26 electrically connected to the other of the pair of electrodes 11, 12, the second electrode 12.
  • This configuration allows the electric field to be cancelled out between both the first bus bar 21 and the capacitor element 10, and between the second bus bar 26 and the capacitor element 10, further improving the effect of reducing inductance.
  • FIG. 4A is a cross-sectional view showing a capacitor module 100A according to a first modification of the first embodiment.
  • a first bus bar 121 has a contact portion 122, an extension portion 123, and a connection portion 124.
  • a second bus bar 126 is formed in a flat plate shape.
  • the extension portion 123 of the first bus bar 121 is disposed so as to cover substantially the entire side surface from the first electrode 11 to the second electrode 12. Therefore, the same effect as in the first embodiment can be achieved.
  • FIG. 4B is a cross-sectional view showing a capacitor module 100B according to the second modification of the first embodiment.
  • the connection portion 224 of the first bus bar 221 may be formed in a bent shape rather than a curved shape.
  • the connection portion 229 of the second bus bar 226 may be formed in a bent shape.
  • the connection portion 224 having a bent shape refers to the connection portion 224 being formed in a bent shape.
  • the capacitor module 100 includes one capacitor element 10 has been described, but this is not limiting.
  • the capacitor module 100 may include multiple capacitor elements 10.
  • FIG. 5 is a cross-sectional view showing a capacitor module 200 according to the second embodiment.
  • the second embodiment differs from the first embodiment in that the connection portion 324 of the first bus bar 321 has a second portion 324a that extends from the end portion 322a of the extension portion 323 so as to be spaced apart in the first direction (Z direction) relative to the side surface 13.
  • the second bus bar 326 also has a similar configuration.
  • connection portion 324 of the first bus bar 321 has a second portion 324a that extends from the end 323a of the extension portion 323 so as to be separated from the side surface 13 in the first direction (Z direction).
  • the connection portion 324 also has a fourth portion 324b that extends between the second portion 324a and the contact portion 322 so as to approach the side surface 13 in the first direction (Z direction).
  • the second portion 324a extends from the end 323a of the extension portion 323 in the direction of arrow D5.
  • the fourth portion 324b extends from the second portion 324a toward the contact portion 322 in the direction of arrow D6.
  • the connection portion 324 is disposed away from the side surface portion of the electrode 11 and the side surface 13 of the capacitor element 10.
  • the second bus bar 326 is connected to the second electrode 12.
  • the second bus bar 326 has a contact portion 327, an extension portion 328, and a connection portion 329, and is formed in the same shape as the first bus bar 321.
  • connection portion 324 has a second portion 324a that extends from the end portion 323a of the extension portion 23 in a first direction (Z direction) away from the side surface 13.
  • the connection portion has a fourth portion 324b that extends between the second portion 324a and the contact portion 322 and approaches the side surface 13 in the first direction (Z direction).
  • the bus bar 20 can be reliably brought into contact with the electrodes 11, 12 and side surface 13 of the capacitor element 10, thereby reducing the inductance of the capacitor module 300.
  • FIG. 3 A capacitor module 300 according to a third embodiment of the present disclosure will be described.
  • differences from the first embodiment will be mainly described.
  • configurations that are the same as or equivalent to those in the first embodiment will be described with the same reference numerals.
  • descriptions that overlap with the first embodiment will be omitted.
  • FIG. 7 is a cross-sectional view showing a capacitor module 300 according to embodiment 4.
  • FIG. 8 is an enlarged view of region R3 in FIGS. 7 and 8.
  • embodiment 3 differs from embodiment 1 in that the connection portion 424 of the first bus bar 421 has both the first portion 242a and the second portion 242b.
  • connection portion 424 of the first bus bar 421 has a first portion 424a that is spaced from the end 422a of the contact portion 422 in the second direction (X direction) relative to the electrode 11, and a second portion 424b that is spaced from the end 423a of the extension portion 423 in the first direction (Z direction) relative to the side surface 13.
  • the connection portion 424 further has a fifth portion 424c that extends from the first portion 424a toward the second portion 424b. That is, in the third embodiment, the connection portion 424 has the first portion 424a that extends away from the electrode 11, the second portion 424b that extends away from the side surface 13, and the fifth portion 424c that connects the first portion 424a and the second portion 424b.
  • the connection portion 424 is arranged so as not to contact the corner portion c1 of the capacitor element 10.
  • the second bus bar 426 has a contact portion 427, an extension portion 428, and a connection portion 429.
  • the connection portion 429 of the second bus bar 426 has a similar configuration to the connection portion 424 of the first bus bar 421.
  • connection portion 424 has a first portion 424a and a second portion 424b.
  • the connection portion 424 has a fifth portion 424c that extends from the first portion 424a toward the second portion 424b.
  • This configuration ensures reliable contact between the bus bar 420 and the electrodes 11 and 12, and between the bus bar 420 and the side surface 13, even if the dimensional accuracy of the capacitor element 10 is low, thereby reducing the inductance of the capacitor module 300.
  • connection portion 424 has both the first portion 424a and the second portion 424b has been described, but this is not limiting. It is sufficient for the connection portion 424 to have at least one of the first portion 424a and the second portion 424b.
  • a capacitor module disclosed herein includes one or more capacitor elements each having a pair of electrodes and a side surface connecting the pair of electrodes, a bus bar electrically connected to one of the pair of electrodes, a case accommodating the one or more capacitor elements and a portion of the bus bar, and a sealing resin filled into the case and sealing the one or more capacitor elements and a portion of the bus bar, wherein the bus bar has a contact portion in contact with the electrode and extending in a first direction, an extension portion disposed along the side surface and extending in a second direction intersecting the first direction, and a connection portion connecting the contact portion and the extension portion, and the connection portion has at least one of a first portion extending from an end of the contact portion so as to be away from the electrode in the second direction, or a second portion extending from an end of the extension portion so as to be away from the side surface in the first direction.
  • connection portion may have a first portion.
  • connection portion may have a third portion between the first portion and the extension portion, which extends toward the electrode in the second direction.
  • connection portion may have a second portion.
  • connection portion may have a fourth portion between the second portion and the contact portion, extending toward the side surface in the first direction.
  • connection portion may have a first portion and a second portion.
  • connection portion may have a fifth portion extending from the first portion toward the second portion.
  • connection portion may be curved.
  • the extension portion and the side of the capacitor element may be in contact.
  • the busbar may include a first busbar electrically connected to one of the pair of electrodes, a first electrode, and a second busbar electrically connected to the second electrode of the pair of electrodes.
  • This disclosure is useful for capacitor modules used in various electronic devices, electrical devices, industrial equipment, vehicle devices, etc.
  • Electrode 10 Capacitor element 11 First electrode (electrode) 12 Second electrode (electrode) 13 Side surface 13a Flat portion 20, 120, 220, 320, 420 Bus bar 21, 121, 221, 321, 421 First bus bar 22, 122, 222, 322, 422 Contact portion 23, 123, 223, 323, 423 Extension portion 24, 124, 224, 324, 424 Connection portion 26, 126, 226, 326, 426 Second bus bar 27, 227, 327, 427 Contact portion 28, 228, 328, 428 Extension portion 29, 229, 329, 429 Connection portion 30 Case 40 Sealing resin 100, 100A, 100B, 200, 300 Capacitor module

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
PCT/JP2024/018525 2023-07-26 2024-05-20 コンデンサモジュール Pending WO2025022776A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025535589A JPWO2025022776A1 (https=) 2023-07-26 2024-05-20

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-121875 2023-07-26
JP2023121875 2023-07-26

Publications (1)

Publication Number Publication Date
WO2025022776A1 true WO2025022776A1 (ja) 2025-01-30

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021193105A1 (ja) * 2020-03-24 2021-09-30 ニチコン株式会社 コンデンサのバスバー構造
JP2023003947A (ja) * 2021-06-25 2023-01-17 日本電産株式会社 コンデンサモジュールとこれを備えたインバータ装置、モータモジュール及び車両

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021193105A1 (ja) * 2020-03-24 2021-09-30 ニチコン株式会社 コンデンサのバスバー構造
JP2023003947A (ja) * 2021-06-25 2023-01-17 日本電産株式会社 コンデンサモジュールとこれを備えたインバータ装置、モータモジュール及び車両

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