WO2023047944A1 - コンデンサ - Google Patents

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Publication number
WO2023047944A1
WO2023047944A1 PCT/JP2022/033433 JP2022033433W WO2023047944A1 WO 2023047944 A1 WO2023047944 A1 WO 2023047944A1 JP 2022033433 W JP2022033433 W JP 2022033433W WO 2023047944 A1 WO2023047944 A1 WO 2023047944A1
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WO
WIPO (PCT)
Prior art keywords
capacitor
capacitor element
external electrodes
hours
external
Prior art date
Application number
PCT/JP2022/033433
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English (en)
French (fr)
Japanese (ja)
Inventor
大矢 西島
智生 稲倉
淳史 川畑
Original Assignee
株式会社村田製作所
株式会社指月電機製作所
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.)
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Publication date
Application filed by 株式会社村田製作所, 株式会社指月電機製作所 filed Critical 株式会社村田製作所
Priority to CN202280063379.3A priority Critical patent/CN117981024A/zh
Priority to JP2023549456A priority patent/JPWO2023047944A1/ja
Publication of WO2023047944A1 publication Critical patent/WO2023047944A1/ja

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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
    • 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.
  • Patent Literature 1 proposes forming external electrodes from metal particles having different average particle sizes. According to Patent Document 1, this suppresses the infiltration of residual moisture in the sealing resin into the capacitor element, thereby reducing the deterioration of the insulation resistance.
  • An object of the present invention is to provide a capacitor in which deterioration of performance due to moisture is suppressed.
  • the present invention comprises a capacitor element, an external electrode arranged on an end surface of the capacitor element, and a lead terminal electrically connected to the external electrode, and the external electrode has a water permeability of 18 g/(24 hours ⁇ m 2 ) or more and 70 g/(24 hours ⁇ m 2 ) or less.
  • ESR equivalent series resistance
  • the maximum height Rz of the external electrodes is preferably 120 ⁇ m or more. This facilitates the release of moisture in the capacitor element to the outside through the external electrodes.
  • the external electrode is, for example, a metallikon electrode.
  • the moisture permeability of metallikon electrodes 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 is provided in which deterioration of performance due to moisture is suppressed.
  • FIG. 1 is a perspective view schematically showing a capacitor according to an embodiment of the invention.
  • the moisture permeability of the external electrode is 18 g/(24 hours ⁇ m 2 ) or more.
  • the moisture present in the capacitor element can be removed by heat treatment after forming the external electrodes.
  • the moisture permeability of the external electrodes is 70 g/(24 hours ⁇ m 2 ) or less.
  • the moisture permeability of the external electrodes is calculated as follows.
  • a sample is prepared that includes a capacitor element and external electrodes arranged on both end surfaces of the capacitor element. This sample is allowed to stand in an environment of 40° C. and 80% RH for 24 hours to absorb moisture.
  • the mass of the sample before and after moisture absorption is measured, and the difference is taken as the moisture permeation amount.
  • a value obtained by dividing the amount of water permeation by the sum of the cross-sectional areas (m 2 ) of the two external electrodes is defined as the water permeability [g/(24 hours ⁇ m 2 )]. It is desirable to thoroughly dry the sample prior to moisture absorption.
  • the cross-sectional area of the external electrode is the cross-sectional area obtained by cutting the external electrode parallel to the end face of the capacitor element.
  • the cross-sectional area of the external electrode is the area of the plan view obtained by projecting the sample from the direction in which the straight line connecting the centers of the two external electrodes extends.
  • the area of the cross section or plan view may be obtained by image processing or may be obtained by calculation.
  • a capacitor according to the present disclosure includes a capacitor element, external electrodes arranged on end faces of the capacitor element, and lead terminals electrically connected to the external electrodes.
  • the water permeability of the external electrode is 18 g/(24 hours ⁇ m 2 ) or more and 70 g/(24 hours ⁇ m 2 ) 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 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 water permeability of the external electrode is 18 g/(24 hours ⁇ m 2 ) or more and 70 g/(24 hours ⁇ m 2 ) or less.
  • the water permeability of one or more external electrodes satisfies the above range. It is preferable that the water permeability of all the external electrodes satisfy the above range.
  • the moisture permeability of the external electrode is preferably 20 g/(24 hours ⁇ m 2 ) or more, more preferably 22 g/(24 hours ⁇ m 2 ) or more.
  • the moisture permeability of the external electrode is preferably 65 g/(24 hours ⁇ m 2 ) or less, more preferably 60 g/(24 hours ⁇ m 2 ) or less.
  • the maximum height Rz of the external electrodes is, for example, 120 ⁇ m or more. When the maximum surface height Rz is within the above range, sufficient voids are often formed inside the external electrodes, and the recesses on the surface of the external electrodes and the voids inside the external electrodes are easily communicated with each other. . Therefore, the moisture in the capacitor element is easily released to the outside through the external electrodes.
  • the maximum height Rz of the external electrodes may be 125 ⁇ m or more.
  • the maximum height Rz of the external electrodes is preferably 200 ⁇ m or less in that it is easy to prevent external moisture from entering the capacitor element through the external electrodes. Maximum height Rz is obtained according to JIS B 0601-2001.
  • 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 moisture permeability can be easily controlled.
  • the moisture permeability 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 moisture permeability of the metallikon electrode can be controlled to 18 g/(24 hours ⁇ m 2 ) or more and 70 g/(24 hours ⁇ m 2 ) or less. .
  • the water permeability of the metallikon electrode is controlled to 18 g/(24 hours/m 2 ) or more and 70 g/(24 hours/m 2 ) or less by adjusting the thermal spraying of the metal per hour to more than 20 g/minute and less than 140 g/minute. can.
  • Lead terminal A part of the lead terminal is usually joined to the external electrode for electrical connection.
  • 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.
  • 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 lead terminals are joined to the external electrodes by welding, for example.
  • 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. This makes it easier to suppress penetration of water into the interior. In addition, water resistance, vibration resistance, etc. are likely to be improved.
  • a typical example of the sealing material is a cured product of a thermosetting resin. Examples of thermosetting resins include epoxy resins and urethane resins. In this case, 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.
  • the capacitor according to the present disclosure includes, for example, a step of forming an external electrode on an end surface of a capacitor element, a step of joining lead terminals to the external electrode to electrically connect them, and a step of forming the external electrode. and heat-treating the capacitor element.
  • the moisture permeability of the formed external electrodes is 18 g/(24 hours ⁇ m 2 ) or more and 70 g/(24 hours ⁇ m 2 ) or less. Since the external electrodes have a high moisture permeability of 18 g/(24 hours ⁇ m 2 ) or more, the heat treatment process removes moisture remaining in the capacitor element. On the other hand, since the water permeability of the external electrodes is suppressed to 70 g/(24 hours ⁇ m 2 ) or less, the infiltration of water through the external electrodes is suppressed after the heat treatment process.
  • the heat treatment is performed, for example, at 125°C or higher and 150°C or lower for 4 to 24 hours.
  • a step of sealing the capacitor element and the external electrodes with a sealing material may be performed.
  • the water permeability of the external electrodes is suppressed to 70 g/(24 hours ⁇ m 2 ) or less, the encapsulant is also suppressed from entering the gaps of the external electrodes.
  • 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 (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. A film capacitor was thus obtained.
  • Example 2-5 Comparative Example 1-5
  • a film capacitor was formed in the same manner as in Example 1, except that the air spray pressure and the shape of the spray nozzle when forming the external electrodes were changed to adjust the moisture permeability of the external electrodes to the values shown in Table 1. was made.
  • the resulting film capacitor was dried at 125° C. for 48 hours to make the capacitor element absolutely dry. After that, the film capacitor was allowed to stand in an environment of 40° C. and 80% RH until 6.5 mg of water per unit volume (1 cm 3 ) of the capacitor element was adsorbed. (Heat treatment) The moisture-adsorbed film capacitor was heated at 125° C. for 4 hours. (sealing) The dried film capacitor was placed in a case and sealed with epoxy resin.
  • ESR change rate The ESR of the absolutely dry film capacitor was taken as the initial value R0 .
  • the ESR change rate ( ⁇ ESR) was calculated.
  • ⁇ ESR (%) 100 ⁇ (RR 0 )/R 0
  • the ESR was measured using an LCR meter (ZM2371 manufactured by NF Circuit Design Block, measurement frequency 10 kHz).
  • ESR ESR change rate
  • ⁇ C rate of change in capacity
  • ⁇ C 1 rate of change in capacity after the load test
  • the ESR change rate ( ⁇ ESR), capacity change rate ( ⁇ C), and after load test of the film capacitor of Comparative Example 1-3 in which the water permeability of the external electrode is less than 18 g/(24 hours ⁇ m 2 )
  • the rate of change in capacity ( ⁇ C 1 ) is large in both cases.
  • the capacity change rate ( ⁇ C 1 ) after the load test is large, and a long life cannot be expected. This is probably because moisture was not sufficiently removed in the heat treatment after the moisture absorption treatment.
  • ESR rate of change ( ⁇ ESR), capacity rate of change ( ⁇ C), and capacity change after load test of the film capacitor of Comparative Example 4-5 in which the water permeability of the external electrode exceeds 70 g/(24 hours ⁇ m 2 )
  • Both ratios ( ⁇ C 1 ) are large.
  • the ESR change rate ( ⁇ ESR) is large. It is considered that this is because moisture suddenly entered the inside of the capacitor after the heat treatment and before the capacitor was sealed, or the sealing resin entered the gaps of the external electrodes.
  • the capacitor of the present invention can be applied to various electronic devices because it suppresses deterioration in performance due to moisture.
  • 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/JP2022/033433 2021-09-27 2022-09-06 コンデンサ WO2023047944A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280063379.3A CN117981024A (zh) 2021-09-27 2022-09-06 电容器
JP2023549456A JPWO2023047944A1 (zh) 2021-09-27 2022-09-06

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021156871 2021-09-27
JP2021-156871 2021-09-27

Publications (1)

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WO2023047944A1 true WO2023047944A1 (ja) 2023-03-30

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CN (1) CN117981024A (zh)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012234919A (ja) * 2011-04-28 2012-11-29 Toyota Motor Corp 金属化フィルムコンデンサ
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012234919A (ja) * 2011-04-28 2012-11-29 Toyota Motor Corp 金属化フィルムコンデンサ
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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CN117981024A (zh) 2024-05-03
JPWO2023047944A1 (zh) 2023-03-30

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