WO2023047945A1 - コンデンサ - Google Patents

コンデンサ Download PDF

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Publication number
WO2023047945A1
WO2023047945A1 PCT/JP2022/033434 JP2022033434W WO2023047945A1 WO 2023047945 A1 WO2023047945 A1 WO 2023047945A1 JP 2022033434 W JP2022033434 W JP 2022033434W WO 2023047945 A1 WO2023047945 A1 WO 2023047945A1
Authority
WO
WIPO (PCT)
Prior art keywords
external electrode
capacitor
thickness
electrode
external
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/JP2022/033434
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
憲治 萩谷
千一 小笹
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 CN202280063711.6A priority Critical patent/CN117981026A/zh
Priority to JP2023549457A priority patent/JP7668367B2/ja
Publication of WO2023047945A1 publication Critical patent/WO2023047945A1/ja
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
    • 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
    • H01G4/252—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 is measured in a penetration mode of a thermomechanical analyzer.
  • the obtained penetration amount P 350 at 350° C. relates to a capacitor that is 5% or more and 30% or less of the thickness of the external electrode.
  • the penetration amount P 350 is 7.5% or more and 25% or less of the thickness of the external electrode. In another aspect, the penetration amount P350 is 10% or more and 20% or less of the thickness of the external electrode. In these cases, the bonding between the external electrode and the lead terminal becomes stronger.
  • a penetration amount P 125 of the external electrode at 125° C. measured in a penetration mode of a thermomechanical analyzer may be 5% or less of the thickness of the external electrode. Thereby, cracking and deformation of the external electrodes are easily suppressed.
  • the external electrode is, for example, a metallikon electrode.
  • the amount of penetration 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.
  • 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 penetration amount P350 at 350° C. of the external electrode used in the present disclosure measured in the penetration mode of the thermomechanical analyzer is 5% or more of the thickness of the external electrode.
  • the amount of penetration is one of the indicators of hardness.
  • the temperature of the external electrode is usually about 350.degree.
  • the penetration amount P350 of the external electrode at the time of joining is 5% or more, part of the lead terminal is likely to be embedded inside the external electrode. Therefore, the contact area between the two is increased, and the adhesion is improved. As a result, 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. This tendency is observed regardless of the material of the external electrodes.
  • the penetration amount P350 is 30% or less of the thickness of the external electrodes. If the penetration amount P 350 exceeds 30% of the thickness of the external electrode, it can be said that the strength (especially tensile strength) of the external electrode is too small, and cracks and deformation may occur. Therefore, the durability is likely to deteriorate.
  • a capacitor according to the present disclosure has good electrical properties (eg, ESR properties).
  • the penetration amount P 350 is calculated as follows. Cut the external electrode into a predetermined size and use it as a sample.
  • the size of the sample may be about 5 mm ⁇ 5 mm. Place the indenter in the center of the surface of the sample.
  • the indenter has a tip with a cylindrical cross-section with a diameter of 0.5 mm.
  • the sample is heated to 350° C. or higher (for example, 450° C. or lower) at a heating rate of 10° C./min while applying a load of 100 gf to the indenter (that is, a pressure of 5 MPa on the sample surface).
  • the indentation depth of the indenter is measured from the start of measurement until it is heated to 350°C. This penetration depth is divided by the sample thickness and multiplied by 100. This operation is performed on four samples from which other portions of the outer electrode are cut. The average value of the five obtained values is regarded as the penetration amount P350 of the external electrode.
  • 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 penetration amount P 350 of the external electrode is 5% or more and 30% or less of the thickness of the external electrode.
  • 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 penetration amount P 350 of the external electrode is 5% or more and 30% or less of the thickness of the external electrode.
  • the penetration amount P350 of at least one of the external electrodes to which the lead terminals are joined satisfies the above range. It is preferable that the penetration amount P 350 of all the external electrodes to which the lead terminals are joined satisfies the above range.
  • the penetration amount P350 of the external electrode is preferably 7.5% or more, more preferably 10% or more.
  • the penetration amount P350 of the external electrode is preferably 25% or less, more preferably 20% or less. In one aspect, the penetration amount P 350 of the external electrode is 7.5% or more and 25% or less of the thickness of the external electrode. In another aspect, the penetration amount P 350 of the external electrode is 10% or more and 20% or less of the thickness of the external electrode.
  • the penetration amount P 125 of the external electrode at 125° C. measured in the penetration mode of the thermomechanical analyzer is preferably 5% or less of the thickness of the external electrode.
  • the working temperature of the capacitor is generally about 125°C. If the penetration amount P125 of the external electrode is 5% or less at 125° C., which is close to the temperature conditions during use, it can be said that the external electrode has sufficient strength, and cracking and deformation are easily suppressed. Therefore, the durability is less likely to deteriorate, and high connection reliability is likely to be obtained over the long term. It is preferable that the penetration amount P125 of at least one of the external electrodes to which the lead terminals are joined satisfies the above range. More preferably, the penetration amount P125 of all external electrodes to which lead terminals are joined satisfies the above range.
  • the lower limit of the penetration amount P125 is not particularly limited, and may be 0.5%, for example.
  • the penetration amount P 125 is calculated using the penetration depth of the indenter from the start of measurement to heating to 125° C., which was measured in the same manner as the penetration amount P 350 .
  • the calculation method is the same as that of the penetration amount P350 .
  • 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 a metal onto each end face of the capacitor element. Such external electrodes are commonly referred to as metallikon electrodes.
  • a metallikon electrode is preferable in that the hardness can be easily controlled.
  • the hardness of the metallikon electrode can be controlled by adjusting the air spray pressure, the amount of metal sprayed per hour, 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 penetration amount P350 of the metallikon electrode can be controlled to 5% or more and 30% or less of the thickness of the external electrode. By adjusting the thermal spraying of the metal to more than 20 g/min and less than 140 g/min, the penetration amount P350 of the metallikon electrode can be controlled to 5% or more and 30% or less of the thickness of the external electrode.
  • 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 Aluminum was vapor-deposited on a urethane resin film (thickness: 3 ⁇ m) to a thickness of 20 nm to prepare a metallized film. A capacitor element was produced by laminating two sheets of this metallized film and winding them. A zinc-aluminum alloy (15% 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. A film capacitor was thus obtained.
  • An external electrode of 5 mm ⁇ 5 mm was cut from the obtained film capacitor to obtain a sample.
  • An indenter having a cylindrical tip with a diameter of 0.5 mm was placed at the center of the surface of the sample, and a load of 100 gf was applied to the indenter.
  • the sample was heated up to 450° C. at a heating rate of 10° C./min, and the penetration depth of the indenter until it was heated to 350° C. was measured. This penetration depth was divided by the sample thickness and multiplied by 100. This operation was performed on four samples from which other portions of the external electrode were cut off, and the penetration amount P 350 of the external electrode was calculated according to the above.
  • the penetration P350 was 7.5%.
  • the penetration depth of the indenter was measured from the start of the measurement until it was heated to 125° C., and the penetration amount P125 was calculated.
  • the penetration amount P 125 was 0.5%.
  • the penetration depth was measured using a TMA needle insertion mode of a thermal analyzer TMA-60 manufactured by Shimadzu Corporation.
  • Example 2-3 Comparative Example 1-2
  • a film capacitor was produced in the same manner as in Example 1, except that the penetration amount P350 of the external electrode was adjusted to the value shown in Table 1 by changing the air blowing pressure when forming the external electrode. .
  • Example 4 A polypropylene resin film (thickness: 3 ⁇ m) was vapor-deposited with aluminum to a thickness of 20 nm to prepare a metallized film. A capacitor element was produced by laminating two sheets of this metallized film and winding them. Two external electrodes (thickness: 1 mm) were formed by thermally spraying zinc on both end surfaces of the obtained capacitor element in the direction of the winding axis. After that, lead terminals (tinned copper wire, diameter 1.2 mm) were resistance-welded to each of the two external electrodes. A film capacitor was thus obtained.
  • Example 5 Comparative Examples 3-4
  • a film capacitor was formed in the same manner as in Example 4, except that the penetration amount P 350 of the external electrode was adjusted to the value shown in Table 2 by changing the spraying amount of metal per time when forming the external electrode. made.
  • the film capacitors of Examples 1-5 having a penetration amount P350 of 5% or more and 30% or less have high bonding strength and high tensile strength.
  • the film capacitors of Comparative Examples 1 and 3, in which the penetration amount P350 is less than 5%, are superior in tensile strength but inferior in bonding strength.
  • the film capacitors of Comparative Examples 2 and 4 having a penetration amount P350 of more than 30% are superior in bonding strength, but inferior in tensile strength.
  • 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)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
PCT/JP2022/033434 2021-09-27 2022-09-06 コンデンサ Ceased WO2023047945A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280063711.6A CN117981026A (zh) 2021-09-27 2022-09-06 电容器
JP2023549457A JP7668367B2 (ja) 2021-09-27 2022-09-06 コンデンサ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021156873 2021-09-27
JP2021-156873 2021-09-27

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WO2023047945A1 true WO2023047945A1 (ja) 2023-03-30

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PCT/JP2022/033434 Ceased WO2023047945A1 (ja) 2021-09-27 2022-09-06 コンデンサ

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CN (1) CN117981026A (https=)
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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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* 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.
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

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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CN117981026A (zh) 2024-05-03
JP7668367B2 (ja) 2025-04-24
JPWO2023047945A1 (https=) 2023-03-30

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