WO2024143172A1 - 固体電解コンデンサ - Google Patents

固体電解コンデンサ Download PDF

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Publication number
WO2024143172A1
WO2024143172A1 PCT/JP2023/046006 JP2023046006W WO2024143172A1 WO 2024143172 A1 WO2024143172 A1 WO 2024143172A1 JP 2023046006 W JP2023046006 W JP 2023046006W WO 2024143172 A1 WO2024143172 A1 WO 2024143172A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
anode
solid electrolyte
cover
solid electrolytic
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/JP2023/046006
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
和哉 山崎
永造 藤井
公平 後藤
祐治 宮地
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2024567723A priority Critical patent/JPWO2024143172A1/ja
Priority to CN202380088693.1A priority patent/CN120418908A/zh
Publication of WO2024143172A1 publication Critical patent/WO2024143172A1/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
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/008—Terminals
    • H01G9/012—Terminals specially adapted for solid capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/15—Solid electrolytic capacitors

Definitions

  • This disclosure relates to solid electrolytic capacitors.
  • ESR equivalent series resistance
  • FIG. 1 is a cross-sectional view illustrating an example of a solid electrolytic capacitor according to the first embodiment.
  • FIG. 2 is a cross-sectional view for illustrating an example of the structure of the solid electrolytic capacitor shown in FIG.
  • FIG. 3 is a cross-sectional view for illustrating another example of the structure of the solid capacitor according to the first embodiment.
  • the distance from the first surface of the solid electrolyte layer formed on the bottom surface (b) to the second surface of the solid electrolyte layer formed on the end surface (e) is defined as L.
  • the carbon layer is formed so as to cover a region of the side surface (s) that is a distance from the first surface that is equal to or less than X (where 0.89 ⁇ X/L ⁇ 1.00).
  • the silver particle layer is formed so as to cover a region of the side surface (s) that is a distance from the first surface that is equal to or less than Y (where 0.90 ⁇ Y/L ⁇ 1.00).
  • the solid electrolyte layer is formed so as to cover a specific surface of the anode body via a dielectric layer.
  • the fact remains that the solid electrolyte layer is formed so as to cover a specific surface of the anode body. Therefore, in this specification, when a specific component A is formed so as to cover the anode body via a specific layer, it may be expressed as "component A is formed so as to cover the anode body.”
  • a cathode extraction layer is not formed on the end surface (e). Therefore, there is no need to form an insulating layer (an insulating layer other than a dielectric layer) on the end surface (e) to reduce leakage current.
  • the solid electrolytic capacitor (S) includes a cathode lead layer formed to cover the entire bottom surface (b) and a part of the side surface (s) of the solid electrolyte layer, but not to cover the end surface (e).
  • the cathode lead layer includes a carbon layer formed on the solid electrolyte layer, and a silver particle layer at least partially formed on the carbon layer.
  • the cathode lead layer is formed to cover an area of the side surface (s) that is a distance from the first surface that is equal to or less than Z (where 0.89 ⁇ Z/L ⁇ 1.00). Z may be equal to or greater than 0.90, or equal to or greater than 0.95.
  • the diameter D of the anode wire and the length W of the short side of the end face (e) may satisfy 0.5 ⁇ D/W.
  • a conductive layer is also formed on the end face (e). Therefore, when the diameter of the anode wire (anode lead) is increased, a short circuit is likely to occur.
  • a cathode extraction layer is not formed on the end face (e). Therefore, even if the diameter D of the anode wire is increased, a short circuit is unlikely to occur.
  • D/W may be in the range of 0.5 to 0.8 (for example, in the range of 0.5 to 0.7). However, D/W may be smaller than 0.5.
  • the short side refers to the shortest side of the side of the end face (e). If the end face (e) is a square, the length of one side of the square is the length W of the short side.
  • the carbon paste may be applied by immersing the anode body on which the solid electrolyte layer is formed in the carbon paste and then lifting it up.
  • the value of X/L described above can be controlled by changing the position of the anode body that is immersed in the carbon paste. Also, the thickness of the carbon layer can be controlled by changing the lifting speed.
  • the anode body may be produced by the following method. First, a portion of the anode wire is embedded in a powder of the anode body material (e.g., metal powder), and the powder is pressure-molded into a columnar shape (e.g., a rectangular parallelepiped). The powder is then sintered to form the anode body. In this manner, an anode body with a portion of the anode wire embedded therein can be produced.
  • a powder of the anode body material e.g., metal powder
  • a columnar shape e.g., a rectangular parallelepiped
  • the solid electrolyte layer is not particularly limited, and may be a solid electrolyte layer used in a known solid electrolytic capacitor.
  • the solid electrolyte layer may be a laminate of two or more different solid electrolyte layers.
  • the solid electrolyte layer is disposed on the dielectric layer. As described above, the solid electrolyte layer is formed so as to cover the entire bottom surface (b), the entire side surface (s), and at least a portion of the end surface (e) of the anode body. The solid electrolyte layer may be formed so as to cover the entire end surface (e) except for the portion where the anode wire protrudes. In other words, the solid electrolyte layer may be formed so as to cover the entire surface of the anode body.
  • the silver particle layer contains silver particles and has electrical conductivity.
  • the thickness of the silver particle layer may be in the range of 5 to 100 ⁇ m (for example, in the range of 10 to 60 ⁇ m).
  • the carbon layer may contain particles of a carbonaceous material having an average particle size of 1 ⁇ m or less.
  • the silver particle layer may contain silver particles having an average particle size of 1 ⁇ m or less.
  • conductive particles (carbonaceous material particles, silver particles) having a small average particle size are applied to the end face (e)
  • the applied conductive particles are likely to reach the dielectric layer of the end face (e), so the leakage current is likely to increase.
  • the solid electrolytic capacitor (S) since a cathode extraction layer is not formed on the end face (e), the leakage current at the end face (e) does not increase even if conductive particles having a small average particle size are used.
  • the ESR can be reduced by using conductive particles having a small average particle size.
  • the average particle size is the median diameter (D50) at which the cumulative volume becomes 50% in the volume-based particle size distribution.
  • the average particle size (median diameter) is determined using a laser diffraction/scattering type particle size distribution measuring device
  • the anode wire 112 has a round rod shape (thin cylindrical shape). A part of the anode wire 112 is embedded in the anode body 113, and the other part protrudes from the end face 113e of the anode body 113.
  • the anode lead terminal 121 is connected to the anode wire 112. The anode lead terminal 121 is electrically connected to the anode body 113 via the anode wire 112.
  • the anode body with the solid electrolyte layer formed was immersed in carbon paste, then pulled out and heated to form a carbon layer.
  • the carbon layer was formed so that the above-mentioned X/L value was 0.89.
  • the anode body with the carbon layer formed was immersed in silver paste, then pulled out and heated to form a silver particle layer.
  • the silver particle layer was formed so that the above-mentioned Y/L value was 0.95 or more and less than 1.00.
  • the anode lead terminal was connected to the anode wire by welding.
  • the cathode lead terminal was connected to the silver particle layer using silver paste.
  • a portion of the anode lead terminal, a portion of the cathode lead terminal, and the capacitor element were covered with an exterior resin. In this manner, capacitor A1 was produced.
  • Capacitors A2 to A3 and C1 to C3 were produced using the same method and conditions as those for producing capacitor A1, except that the conditions for forming the carbon layer were changed. Specifically, the carbon layer was formed by changing the value of X/L to the values shown in Table 1. In capacitor C2, the carbon layer was attached to a part of the end face (e) of the sintered body. In capacitor C3, the entire end face (e) was covered with the carbon layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
PCT/JP2023/046006 2022-12-26 2023-12-21 固体電解コンデンサ Ceased WO2024143172A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024567723A JPWO2024143172A1 (https=) 2022-12-26 2023-12-21
CN202380088693.1A CN120418908A (zh) 2022-12-26 2023-12-21 固体电解电容器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-208809 2022-12-26
JP2022208809 2022-12-26

Publications (1)

Publication Number Publication Date
WO2024143172A1 true WO2024143172A1 (ja) 2024-07-04

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ID=91717807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/046006 Ceased WO2024143172A1 (ja) 2022-12-26 2023-12-21 固体電解コンデンサ

Country Status (3)

Country Link
JP (1) JPWO2024143172A1 (https=)
CN (1) CN120418908A (https=)
WO (1) WO2024143172A1 (https=)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0997747A (ja) * 1995-09-28 1997-04-08 Nec Corp 固体電解コンデンサ及びその製造方法
JP2009130166A (ja) * 2007-11-26 2009-06-11 Sanyo Electric Co Ltd 固体電解コンデンサ
JP2010278423A (ja) * 2009-04-28 2010-12-09 Sanyo Electric Co Ltd 固体電解コンデンサ及びその製造方法
JP2015220247A (ja) * 2014-05-14 2015-12-07 ローム株式会社 固体電解コンデンサおよび固体電解コンデンサの製造方法
JP2019145726A (ja) * 2018-02-23 2019-08-29 パナソニックＩｐマネジメント株式会社 固体電解コンデンサ
WO2022264794A1 (ja) * 2021-06-15 2022-12-22 株式会社村田製作所 固体電解コンデンサ素子及び固体電解コンデンサ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0997747A (ja) * 1995-09-28 1997-04-08 Nec Corp 固体電解コンデンサ及びその製造方法
JP2009130166A (ja) * 2007-11-26 2009-06-11 Sanyo Electric Co Ltd 固体電解コンデンサ
JP2010278423A (ja) * 2009-04-28 2010-12-09 Sanyo Electric Co Ltd 固体電解コンデンサ及びその製造方法
JP2015220247A (ja) * 2014-05-14 2015-12-07 ローム株式会社 固体電解コンデンサおよび固体電解コンデンサの製造方法
JP2019145726A (ja) * 2018-02-23 2019-08-29 パナソニックＩｐマネジメント株式会社 固体電解コンデンサ
WO2022264794A1 (ja) * 2021-06-15 2022-12-22 株式会社村田製作所 固体電解コンデンサ素子及び固体電解コンデンサ

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Publication number Publication date
JPWO2024143172A1 (https=) 2024-07-04
CN120418908A (zh) 2025-08-01

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