WO2023047943A1 - コンデンサ - Google Patents

コンデンサ Download PDF

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Publication number
WO2023047943A1
WO2023047943A1 PCT/JP2022/033431 JP2022033431W WO2023047943A1 WO 2023047943 A1 WO2023047943 A1 WO 2023047943A1 JP 2022033431 W JP2022033431 W JP 2022033431W WO 2023047943 A1 WO2023047943 A1 WO 2023047943A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitor
external electrodes
electrode
external
porosity
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.)
Ceased
Application number
PCT/JP2022/033431
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
智生 稲倉
克之 平上
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 CN202280063380.6A priority Critical patent/CN117981025A/zh
Priority to JP2023549455A priority patent/JP7668366B2/ja
Publication of WO2023047943A1 publication Critical patent/WO2023047943A1/ja
Priority to US18/606,126 priority patent/US12586725B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01G4/002—Details
    • H01G4/005—Electrodes
    • H01G4/008—Selection of materials
    • 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
    • H01G4/005—Electrodes
    • H01G4/012—Form of non-self-supporting electrodes
    • 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
    • H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
    • 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
    • H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
    • H01G4/2325—Terminals electrically connecting two or more layers of a stacked or rolled capacitor characterised by the material of the 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
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H01G4/252—Terminals the terminals being coated on the capacitive element
    • 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
    • H01G4/32—Wound capacitors

Definitions

  • the present invention relates to capacitors.
  • Japanese Patent Laid-Open No. 2004-100003 proposes forming unevenness on the joint surface of the lead terminal with the metallikon electrode. According to Patent Literature 1, this ensures that the lead terminal is connected and fixed to the metallikon electrode.
  • An object of the present invention is to provide a capacitor having high connection reliability between external electrodes and lead terminals.
  • the present invention comprises a capacitor element, an external electrode arranged on an end surface of the capacitor element, and a lead terminal joined to the external electrode, and the external electrode has a porosity of 8% or more and 20% or less.
  • the capacitor has a porosity of 8% or more and 20% or less.
  • the porosity of the external electrodes is preferably 10% or more and 20% or less. Thereby, the joint between the external electrode and the lead terminal becomes stronger.
  • the external electrode is, for example, a metallikon electrode.
  • the porosity of the metallikon electrode is easy to control.
  • the external electrode may contain an alloy of zinc and aluminum.
  • the capacitor element has an internal electrode, and the internal electrode is made of, for example, a metallized film.
  • the metallized film includes, for example, a resin film and a metal layer formed on at least one main surface of the resin film. That is, the capacitor of the present invention may be a film capacitor.
  • a capacitor having high connection reliability between external electrodes and lead terminals is provided.
  • FIG. 1 is a perspective view schematically showing a capacitor according to an embodiment of the invention
  • FIG. It is a perspective view of a capacitor for explaining a method of measuring bonding strength.
  • 10 is an electron microscope image (magnification: 300) of a part of the cross section of the external electrode of the capacitor manufactured in Example 2.
  • FIG. 3 is an electron microscopic image (magnification: 300) of a part of the cross section of the external electrode of the capacitor manufactured in Comparative Example 1.
  • the external electrodes provided on the end faces of capacitor elements have a dense structure for the purpose of reducing resistance and reducing moisture permeability.
  • a dense external electrode has a high hardness. Therefore, the adhesion between the external electrodes and the lead terminals is low, and the bonding strength tends to be low. Therefore, the idea of reducing the hardness of the external electrodes to improve the adhesion between the lead terminals and the external electrodes was conceived. According to this method, since it is not necessary to process the lead terminal to have unevenness, the mechanical strength of the lead terminal is not lowered.
  • the hardness of the external electrode is affected by the porosity, and the higher the porosity, the lower the hardness. This tendency is observed regardless of the material of the external electrodes.
  • the porosity of the external electrodes is controlled to reduce their hardness.
  • the porosity of conventional external electrodes is around 5% (approximately 4.5% to 6%).
  • the porosity of the external electrodes used in the present disclosure is 8% or more. This sufficiently reduces the hardness of the external electrodes. Therefore, when the lead terminal is joined to the external electrode, part of the lead terminal is likely to be embedded inside the external electrode, increasing the contact area between the two. As a result, the adhesion is improved, the bonding strength is increased, and the reliability of electrical connection is also improved. Furthermore, variations in adhesion between products are suppressed, and the yield is improved.
  • the porosity of the external electrodes should be 20% or less. If the porosity exceeds 20%, the conductive paths are reduced and the electrical resistance is greatly increased. Therefore, the performance as an electrode is degraded. In addition, since the contact area with the lead terminals is reduced, the adhesion is rather reduced.
  • a capacitor according to the present disclosure has good electrical properties (eg, ESR properties).
  • the porosity of the external electrodes is calculated as follows. First, the capacitor is cut to expose the cross section of the external electrodes. The cross section is observed with a scanning electron microscope (SEM) at a magnification of 300 times, and binarized so that the voids are black and the other portions are white. Next, a measurement range having a cross-sectional area of 0.05 mm 2 or more is determined from the observation field of view. The measurement range is determined so as not to include areas other than the cross section of the external electrode, such as the background. Calculate the ratio of the black portion in this measurement range. This operation is performed for at least four other cross sections of the external electrode. An average value of 5 or more obtained values is regarded as the porosity of the external electrode.
  • SEM scanning electron microscope
  • the cutting direction of the capacitor is not particularly limited, and may be the thickness direction of the external electrodes or the direction parallel to the end face of the capacitor element.
  • the measurement range may be 0.3 mm 2 or less.
  • the measurement range is desirably 0.07 mm 2 or more and 0.2 mm 2 or less.
  • a capacitor according to the present disclosure includes a capacitor element, external electrodes arranged on end faces of the capacitor element, and lead terminals joined to the external electrodes.
  • the porosity of the external electrodes is 8% or more and 20% or less.
  • the capacitor according to the present disclosure can be applied to various uses.
  • the capacitor according to the present disclosure is particularly suitable for use in environments with large temperature changes. Furthermore, since high connection reliability can be expected over the long term, it is suitably used for electronic devices mounted on automobiles and industrial equipment, particularly electric compressors, pumps, and power devices. Examples of power devices include chargers, DC-DC converters, and drive inverters.
  • the size and shape of the capacitor are not particularly limited, and can be set appropriately according to the capacity, application, etc.
  • the type of capacitor is also not particularly limited.
  • Capacitors according to the present disclosure are typically film capacitors. Hereinafter, the capacitor according to the present disclosure will be described in detail by taking a film capacitor as an example. A capacitor according to the present disclosure is not limited to this.
  • a capacitor element generally includes two types of internal electrodes having different polarities (hereinafter referred to as a first internal electrode and a second internal electrode).
  • the capacitor element may be of the laminated type or of the wound type.
  • the first internal electrodes and the second internal electrodes are cut to a predetermined size and laminated alternately.
  • the first internal electrode and the second internal electrode are long bodies, which are laminated, then wound, and pressed if necessary.
  • the cross-section of the capacitor element can be elliptical (the track shape of an athletics stadium).
  • the configurations of the first internal electrode and the second internal electrode may be the same or different.
  • Each internal electrode is composed of, for example, a metallized film.
  • a metallized film includes a resin film and a metal layer formed on at least one main surface of the resin film.
  • the material of the resin film is not particularly limited, and may be a thermosetting resin or a thermoplastic resin.
  • Thermosetting resins include, for example, phenol resins, epoxy resins, melamine resins, urea resins, unsaturated polyester resins, silicone resins, urethane resins, and thermosetting polyimides.
  • Thermoplastic resins include, for example, polypropylene, polyethersulfone, polyetherimide, and polyallyl arylate. These are used singly or in combination of two or more.
  • the resin film may further contain an additive such as a leveling agent.
  • the thickness of the resin film may be 5 ⁇ m or less, 3.5 ⁇ m or less, or 3.4 ⁇ m or less.
  • the thickness of the resin film may be 0.5 ⁇ m or more. In one aspect, the thickness of the resin film is 0.5 ⁇ m or more and 5 ⁇ m or less.
  • the thickness of the resin film can be measured using an optical thickness gauge.
  • the metal layer is formed on part of at least one main surface of the resin film, for example, by vapor deposition.
  • Metal species contained in the metal layer include, for example, aluminum, zinc, titanium, magnesium, copper, and nickel.
  • the thickness of the metal layer is not particularly limited. From the viewpoint of damage suppression, the thickness of the metal layer is preferably 5 nm or more. The thickness of the metal layer is preferably 40 nm or less. The thickness of the metal layer can be specified by observing a cross section obtained by cutting the metallized film in the thickness direction using an electron microscope such as a field emission scanning electron microscope (FE-SEM).
  • FE-SEM field emission scanning electron microscope
  • the external electrodes are arranged on the end faces of the capacitor element.
  • the external electrodes are generally arranged on opposite end faces of the capacitor element, respectively.
  • the external electrodes are arranged on both respective end faces in the direction of the winding axis of the capacitor element.
  • the external electrode may cover the end surface of the capacitor element.
  • the external electrodes are electrically connected to the internal electrodes and play a role in drawing out the internal electrodes to the outside.
  • One of the external electrodes (first external electrode) is electrically connected to the first internal electrode.
  • Another external electrode (second external electrode) is electrically connected to the second internal electrode.
  • the porosity of the external electrodes is 8% or more and 20% or less.
  • the porosity of at least one of the external electrodes to which the lead terminals are joined satisfies the above range. It is preferable that all the porosities of the external electrodes to which the lead terminals are joined satisfy the above range.
  • the porosity of the external electrodes is preferably 10% or more, more preferably 11% or more.
  • the porosity of the external electrodes is preferably 19% or less, more preferably 18% or less. In one aspect, the external electrode has a porosity of 10% or more and 20% or less.
  • the external electrodes are typically made of metal.
  • Metal species include, for example, zinc, aluminum, tin, and zinc-aluminum alloys.
  • the aluminum content is, for example, 20% or less, 18% or less, or 15% or less.
  • the aluminum content is, for example, 0.1% or more, 0.5% or more, or 1% or more.
  • the thickness of the external electrodes is not particularly limited.
  • the thickness of the external electrode is, for example, 0.5 mm or more and 3 mm or less.
  • the thickness of the external electrode is the length of the external electrode in the direction normal to the end face of the capacitor element.
  • the thickness of the external electrode is the average value of arbitrary multiple locations (preferably three or more locations).
  • the external electrodes are formed, for example, by spraying metal onto the end faces of the capacitor element. Such external electrodes are commonly referred to as metallikon electrodes.
  • a metallikon electrode is preferable in that the porosity can be easily controlled.
  • the porosity of the metallikon electrode can be controlled by adjusting the air spray pressure, the amount of metal sprayed per unit time, the shape of the spray nozzle, the distance from the tip of the spray nozzle to the object, and the like. For example, by adjusting the blowing air pressure to more than 0.15 MPa and less than 0.7 MPa, the porosity of the metallikon electrode can be controlled to 8% or more and 20% or less.
  • the porosity of the metallikon electrode can be controlled to 8% or more and 20% or less by adjusting the thermal spraying of the metal to more than 20 g/min and less than 140 g/min.
  • the lead terminals are joined to and electrically connected to the external electrodes.
  • One or more lead terminals are usually joined to one external electrode.
  • the lead terminals are joined to the external electrodes by welding, for example. According to the present disclosure, since the adhesion between the lead terminal and the external electrode is improved, the bonding strength is increased.
  • the joint position between the lead terminal and the external electrode is not particularly limited. As will be described later, when the capacitor element and the external electrodes are resin-sealed, the lead terminals are joined to the external electrodes so that a portion of the lead terminals are exposed outside from the sealing resin.
  • the material of the lead terminal is not particularly limited as long as it exhibits conductivity.
  • the lead terminal may be, for example, a steel wire or a copper wire, and these wires may be tin-plated, zinc-plated, copper-plated, nickel-plated, or the like.
  • the cross-sectional shape of the lead terminal is also not particularly limited, and may be circular, elliptical, or rectangular.
  • the capacitor element and the external electrodes may be sealed with a sealing material.
  • a sealing material is a cured product of a thermosetting resin.
  • thermosetting resins include epoxy resins and urethane resins.
  • the capacitor element and the external electrodes are sealed with a hardened thermosetting resin.
  • the sealing material may further contain an inorganic filler.
  • the capacitor element may be housed in a case.
  • the gap between the capacitor element and the case is filled with a sealing material.
  • This capacitor is manufactured, for example, as follows. First, a capacitor element having an external electrode is arranged, and lead terminals are led out of the case. Thereafter, a thermosetting resin is filled between the case and the capacitor element and cured.
  • FIG. 1 is a perspective view schematically showing a capacitor according to the present disclosure.
  • the capacitor 10 includes a capacitor element 1, two external electrodes (first external electrode 2A, second external electrode 2B), and two lead terminals (first lead terminal 3A, second lead terminal 3B).
  • the end face shape of capacitor element 1 is elliptical.
  • First external electrode 2A is arranged on one end surface of capacitor element 1
  • second external electrode 2B is arranged on the other end surface of capacitor element 1 .
  • the first lead terminal 3A is joined to the first external electrode 2A
  • the second lead terminal 3B is joined to the second external electrode 2B.
  • Example 1 A metallized film was prepared by vapor-depositing aluminum on a urethane resin film (thickness: 3 ⁇ m) so as to have a thickness of 20 nm.
  • a capacitor element was produced by laminating two sheets of this metallized film and winding them.
  • a zinc-aluminum alloy (6% aluminum content) was thermally sprayed on both end surfaces of the obtained capacitor element in the direction of the winding axis to form two external electrodes (thickness: 1 mm). After that, lead terminals (tinned copper wire, diameter 1.2 mm) were resistance-welded to each of the two external electrodes. As a result, 10 film capacitors were obtained.
  • the resulting film capacitor was cut along the winding axis to expose the cross section of the external electrodes.
  • This cross section was observed with a SEM (S-3400N, manufactured by Hitachi High-Technologies Corporation) at a magnification of 300 times.
  • a measurement range having a cross-sectional area of 0.08 mm 2 was determined from the observation field, and the ratio of the black portion was calculated.
  • This operation was performed for the other four cross sections of the external electrodes and the other nine film capacitors, and averaged (number of cross sections measured: 50).
  • the porosity of the external electrodes was 10.1%.
  • Example 2-4 Comparative Example 1-4
  • the porosity of the external electrodes was adjusted to the value shown in Table 1 by changing the air spray pressure and the amount of metal sprayed per time when forming the external electrodes. , 10 film capacitors were produced.
  • the lead terminals and the external electrodes are firmly joined.
  • the film capacitor of Example 1-4 also has a low resistance value.
  • the film capacitor of Comparative Example 1-3 has a small porosity and is inferior in bonding strength.
  • the film capacitor of Comparative Example 4 has a large porosity and a bonding strength comparable to that of Example 4. However, since the porosity is too large, the resistance value of the external electrodes themselves increases, resulting in a large resistance value as a capacitor.
  • FIG. 3 shows a SEM image (magnification: 300) of a part of the cross section of the external electrode of the capacitor manufactured in Example 2.
  • FIG. 4 shows a SEM image (magnification: 300) of a part of the cross section of the external electrode of the capacitor manufactured in Comparative Example 1. As shown in FIG. In the illustrated example, the area surrounded by a rectangle is the measurement range.
  • the capacitor of the present invention can be expected to have high connection reliability over the long term, it can be applied to various electronic devices.
  • Capacitor 1 Capacitor Element 2A First External Electrode 2B Second External Electrode 3A First Lead Terminal 3B Second Lead Terminal

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
PCT/JP2022/033431 2021-09-27 2022-09-06 コンデンサ Ceased WO2023047943A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202280063380.6A CN117981025A (zh) 2021-09-27 2022-09-06 电容器
JP2023549455A JP7668366B2 (ja) 2021-09-27 2022-09-06 コンデンサ
US18/606,126 US12586725B2 (en) 2021-09-27 2024-03-15 Capacitor having an external electrode with increased porosity

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-156866 2021-09-27
JP2021156866 2021-09-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/606,126 Continuation US12586725B2 (en) 2021-09-27 2024-03-15 Capacitor having an external electrode with increased porosity

Publications (1)

Publication Number Publication Date
WO2023047943A1 true WO2023047943A1 (ja) 2023-03-30

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PCT/JP2022/033431 Ceased WO2023047943A1 (ja) 2021-09-27 2022-09-06 コンデンサ

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US (1) US12586725B2 (https=)
JP (1) JP7668366B2 (https=)
CN (1) CN117981025A (https=)
WO (1) WO2023047943A1 (https=)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019097753A1 (ja) * 2017-11-15 2019-05-23 株式会社村田製作所 フィルムコンデンサ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663149B1 (fr) * 1990-06-08 1993-09-17 Europ Composants Electron Condensateur feuillete et procede de fabrication d'un tel condensateur.
JP2008166457A (ja) 2006-12-28 2008-07-17 Showa Denki Kk 電子部品のリード端子の構造
US8098479B1 (en) * 2008-09-19 2012-01-17 Cornell Dubilier Marketing, Inc. Capacitor having zinc coated common edge with welded aluminum terminal
JP5407031B2 (ja) 2010-05-31 2014-02-05 ニチコン株式会社 金属化フィルムコンデンサ
JP6085202B2 (ja) 2013-03-19 2017-02-22 ニチコン株式会社 金属化フィルムコンデンサ
JP6322804B2 (ja) 2013-04-04 2018-05-16 パナソニックＩｐマネジメント株式会社 金属化フィルムコンデンサの製造方法
JP7404377B2 (ja) * 2019-08-30 2023-12-25 株式会社村田製作所 フィルムコンデンサ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019097753A1 (ja) * 2017-11-15 2019-05-23 株式会社村田製作所 フィルムコンデンサ

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CN117981025A (zh) 2024-05-03
JPWO2023047943A1 (https=) 2023-03-30
US12586725B2 (en) 2026-03-24
JP7668366B2 (ja) 2025-04-24
US20240222024A1 (en) 2024-07-04

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