WO2024079967A1 - コンデンサ - Google Patents

コンデンサ Download PDF

Info

Publication number
WO2024079967A1
WO2024079967A1 PCT/JP2023/028667 JP2023028667W WO2024079967A1 WO 2024079967 A1 WO2024079967 A1 WO 2024079967A1 JP 2023028667 W JP2023028667 W JP 2023028667W WO 2024079967 A1 WO2024079967 A1 WO 2024079967A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal case
capacitor
capacitor element
insulating member
protrusion
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/JP2023/028667
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
憲治 萩谷
智久 内田
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 JP2024551239A priority Critical patent/JPWO2024079967A1/ja
Publication of WO2024079967A1 publication Critical patent/WO2024079967A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
    • 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
    • H01G4/224—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
    • H01G4/32—Wound capacitors

Definitions

  • the present invention relates to a capacitor.
  • Patent Document 1 discloses a case-molded capacitor in which a bus bar with electrode terminals for external connection is connected to the electrode portion of a capacitor element, and the capacitor element is housed in a case with an opening on the top and molded with resin except for at least the electrode terminals of the bus bar, and the case is a metal case, and an insulating heat transfer layer is provided between the bottom surface of the metal case and the capacitor element.
  • the capacitor element may generate heat, which may cause a deterioration in electrical characteristics. Therefore, if a metal case is used to house the capacitor element in a case molded capacitor, it is expected that the heat generated in the capacitor element will be diffused to the metal case, making it easier to cool the capacitor element. However, in a case molded capacitor using a metal case, if electrical insulation between the capacitor element (particularly the electrode part) and the metal case is not ensured, electrical conduction between the capacitor element and the metal case may occur, compromising the capacitor's functionality.
  • the case molded capacitor described in Patent Document 1 provides an insulating heat transfer layer between the bottom surface of the metal case and the capacitor element, ensuring electrical insulation between the capacitor element and the metal case while diffusing heat generated in the capacitor element through the insulating heat transfer layer to the metal case and removing it.
  • the case molded capacitor described in Patent Document 1 requires the provision of a molded resin for molding the capacitor element and the insulating heat transfer layer in addition to the insulating heat transfer layer, resulting in a complex structure.
  • the present invention has been made to solve the above problems, and aims to provide a capacitor with a simple structure that can ensure electrical insulation between the capacitor element and the metal case while improving the cooling function of the capacitor element.
  • the capacitor of the present invention comprises a capacitor element having a body and an external electrode provided on an end face of the body, a lead terminal electrically connected to the external electrode, a metal case in which the capacitor element is housed so that the lead terminal protrudes outward, an insulating member housed inside the metal case and positions the capacitor element so that the lead terminal does not come into contact with the metal case, and a filling resin filled inside the metal case so as to embed the capacitor element, and is characterized in that a protrusion is provided on the inner surface of the metal case at a position where the insulating member is not present, protruding toward the capacitor element, and the shortest distance between the capacitor element and the protrusion is smaller than the shortest distance between the lead terminal and the metal case.
  • the present invention provides a capacitor with a simple structure that ensures electrical insulation between the capacitor element and the metal case while improving the cooling function of the capacitor element.
  • FIG. 1 is a schematic perspective view showing an example of a capacitor of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an example of a cross section of the capacitor shown in FIG. 1 taken along line a1-a2.
  • FIG. 3 is a schematic cross-sectional view showing an example of a cross section of the capacitor shown in FIG. 1 taken along line segment b1-b2.
  • FIG. 4 is a schematic perspective view showing an example of the capacitor element shown in FIGS. 1, 2, and 3.
  • FIG. FIG. 5 is a schematic cross-sectional view showing an example of a cross section of the capacitor element shown in FIG. 4 taken along line c1-c2.
  • a film capacitor is shown as an example of a capacitor of the present invention.
  • the capacitor of the present invention can also be applied to capacitors other than film capacitors.
  • the capacitor of the present invention comprises a capacitor element having a body and an external electrode provided on an end face of the body, a lead terminal electrically connected to the external electrode, a metal case in which the capacitor element is housed so that the lead terminal protrudes outward, an insulating member housed inside the metal case and positions the capacitor element so that the lead terminal does not come into contact with the metal case, and a filling resin filled inside the metal case so as to embed the capacitor element, and is characterized in that a protrusion is provided on the inner surface of the metal case at a position where the insulating member is not present, protruding toward the capacitor element, and the shortest distance between the capacitor element and the protrusion is smaller than the shortest distance between the lead terminal and the metal case.
  • FIG. 1 is a schematic perspective view showing an example of a capacitor of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an example of a cross-section along line segment a1-a2 of the capacitor shown in FIG. 1.
  • FIG. 3 is a schematic cross-sectional view showing an example of a cross-section along line segment b1-b2 of the capacitor shown in FIG. 1.
  • the capacitor 1 shown in Figures 1, 2, and 3 has a capacitor element 10 (see Figure 4 described later), a first pull-out terminal 20a, a second pull-out terminal 20b, a metal case 30, an insulating member 40, and a filling resin 50.
  • the first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.
  • FIG. 4 is a schematic perspective view showing an example of the capacitor element shown in FIGS. 1, 2, and 3.
  • FIG. 5 is a schematic cross-sectional view showing an example of a cross-section along line segment c1-c2 of the capacitor element shown in FIG. 4.
  • the capacitor element 10 shown in Figures 4 and 5 has a body 11, a first external electrode 12a, and a second external electrode 12b.
  • the element body 11 is a wound body in which the first metallized film 13a and the second metallized film 13b are wound in a stacked state in the first direction D1.
  • the capacitor 1, or more specifically, the capacitor element 10 is a wound-type film capacitor in which the metallized films are stacked and wound.
  • the capacitor 1, or more specifically, the capacitor element 10 may be a laminated film capacitor in which metallized films are laminated.
  • element body 11 has a flat cross-sectional shape when viewed in a cross section perpendicular to the winding axis direction of element body 11 (second direction D2 in FIG. 4). More specifically, it is preferable that element body 11 is pressed into a flat shape such as an ellipse or oval, and that the cross-sectional shape of element body 11 is thinner than when it is a perfect circle.
  • Whether the base body has been pressed to have a flat cross-sectional shape can be confirmed, for example, by checking whether or not there are press marks on the base body.
  • the capacitor element 10 may have a cylindrical winding axis.
  • the winding axis is disposed on the central axis of the first metallized film 13a and the second metallized film 13b in the wound state, and serves as the winding axis when winding the first metallized film 13a and the second metallized film 13b.
  • the first metallized film 13a has a first dielectric film 14a and a first metal layer 15a.
  • the first dielectric film 14a has a first principal surface 14aa and a second principal surface 14ab that face each other in the first direction D1.
  • the first metal layer 15a is provided on the first main surface 14aa of the first dielectric film 14a. More specifically, the first metal layer 15a is provided on the first main surface 14aa of the first dielectric film 14a so as to reach one side edge of the first dielectric film 14a in the second direction D2, but not to reach the other side edge of the first dielectric film 14a.
  • the second metallized film 13b has a second dielectric film 14b and a second metal layer 15b.
  • the second dielectric film 14b has a first main surface 14ba and a second main surface 14bb that face each other in the first direction D1.
  • the second metal layer 15b is provided on the first main surface 14ba of the second dielectric film 14b. More specifically, the second metal layer 15b is provided on the first main surface 14ba of the second dielectric film 14b so as not to reach one side edge of the second dielectric film 14b in the second direction D2, but to reach the other side edge of the second dielectric film 14b.
  • the adjacent first metallized films 13a and second metallized films 13b are shifted in the second direction D2 so that the end of the first metal layer 15a that reaches the side edge of the first dielectric film 14a is exposed on one end surface of the element body 11, and the end of the second metal layer 15b that reaches the side edge of the second dielectric film 14b is exposed on the other end surface of the element body 11.
  • the first metallized film 13a protrudes toward the first external electrode 12a relative to the second metallized film 13b.
  • the second metallized film 13b protrudes toward the second external electrode 12b relative to the first metallized film 13a.
  • the first metal layer 15a is connected to the first external electrode 12a and is not connected to the second external electrode 12b.
  • the second metal layer 15b is connected to the second external electrode 12b and is not connected to the first external electrode 12a.
  • the adjacent first metallized film 13a and second metallized film 13b are shifted in the second direction D2 as described above, so that in the adjacent first dielectric film 14a and second dielectric film 14b, the first dielectric film 14a having the first metal layer 15a on the first main surface 14aa protrudes toward the first external electrode 12a relative to the second dielectric film 14b having the first metal layer 15a not provided on its main surface.
  • the second dielectric film 14b having the second metal layer 15b on the first main surface 14ba protrudes toward the second external electrode 12b relative to the first dielectric film 14a having the second metal layer 15b not provided on its main surface.
  • the element body 11 is formed by winding the first metallized film 13a and the second metallized film 13b in a stacked state in the first direction D1, and therefore can be said to include the first dielectric film 14a, the first metal layer 15a, the second dielectric film 14b, and the second metal layer 15b in the first direction D1. It can also be said that the element body 11 is a wound body formed by winding the first dielectric film 14a, the first metal layer 15a, the second dielectric film 14b, and the second metal layer 15b in the first direction D1.
  • the first main surface 14aa of the first dielectric film 14a and the second main surface 14bb of the second dielectric film 14b face each other in the first direction D1
  • the second main surface 14ab of the first dielectric film 14a and the first main surface 14ba of the second dielectric film 14b face each other in the first direction D1.
  • the first metallized film 13a and the second metallized film 13b are wound in a state in which they are stacked in the first direction D1.
  • the first metallized film 13a and the second metallized film 13b are wound in a state in which they are stacked in the first direction D1, so that the second metallized film 13b is on the inside of the first metallized film 13a, and more specifically, the first metal layer 15a is on the inside of the first dielectric film 14a, and the second metal layer 15b is on the inside of the second dielectric film 14b. That is, in the element body 11, the first metal layer 15a and the second metal layer 15b face each other with the first dielectric film 14a or the second dielectric film 14b sandwiched between them.
  • the first metal layer 15a may be provided with a fuse portion.
  • the fuse portion provided in the first metal layer 15a is, for example, a portion of the first metal layer 15a that connects a divided electrode portion in which the portion facing the second metal layer 15b is divided into multiple portions, and an electrode portion that does not face the second metal layer 15b.
  • Examples of electrode patterns of the first metal layer 15a provided with a fuse portion include the electrode patterns disclosed in JP 2004-363431 A and JP 5-251266 A.
  • the second metal layer 15b may also be provided with a fuse portion, similar to the first metal layer 15a.
  • the first dielectric film 14a may contain a curable resin as a main component.
  • the main component means the component with the highest weight percentage, preferably the component with a weight percentage greater than 50% by weight.
  • the curable resin may be a thermosetting resin or a photocurable resin.
  • thermosetting resin means a resin that can be cured by heat, but the curing method is not limited. Therefore, thermosetting resin also includes resins that can be cured by methods other than heat (for example, light, electron beam, etc.) so long as they are heat-curable. Also, depending on the material, a reaction may be initiated due to the reactivity of the material itself, and resins that proceed to cure without necessarily being subjected to heat from the outside are also considered to be thermosetting resins. The same applies to photocurable resins, and so long as they are light-curable, they also include resins that can be cured by methods other than light (for example, heat, etc.).
  • the curable resin is preferably made of a cured product of a first organic material having a hydroxyl group (OH group) and a second organic material having an isocyanate group (NCO group).
  • the curable resin is made of a cured product having a urethane bond obtained by reacting the hydroxyl group of the first organic material with the isocyanate group of the second organic material.
  • FT-IR Fourier transform infrared spectrophotometer
  • the first dielectric film 14a may contain at least one of a hydroxyl group and an isocyanate group.
  • the first dielectric film 14a may contain either a hydroxyl group or an isocyanate group, or may contain both a hydroxyl group and an isocyanate group.
  • Examples of the first organic material include phenoxy resin, polyvinyl acetoacetal resin, polyvinyl butyral resin, etc.
  • the second organic material examples include aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI), and aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI).
  • aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI)
  • aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI).
  • HDI hexamethylene diisocyanate
  • the second organic material multiple types of organic materials may be used in combination.
  • the first dielectric film 14a may contain a thermoplastic resin as a main component.
  • thermoplastic resins examples include polypropylene, polyethersulfone, polyetherimide, polyarylate, etc.
  • the first dielectric film 14a may contain additives to impart various functions.
  • Additives include, for example, leveling agents to impart smoothness.
  • the additive preferably has a functional group that reacts with a hydroxyl group and/or an isocyanate group and forms part of the crosslinked structure of the cured product.
  • examples of such additives include resins having at least one functional group selected from the group consisting of a hydroxyl group, an epoxy group, a silanol group, and a carboxyl group.
  • the second dielectric film 14b may contain a thermosetting resin as a main component, a photocurable resin as a main component, or a thermoplastic resin as a main component.
  • the second dielectric film 14b may also contain an additive, like the first dielectric film 14a.
  • compositions of the first dielectric film 14a and the second dielectric film 14b may be different from each other, but are preferably the same.
  • the thickness of the first dielectric film 14a and the second dielectric film 14b is preferably 1 ⁇ m or more and 10 ⁇ m or less, and more preferably 3 ⁇ m or more and 5 ⁇ m or less.
  • the thicknesses of the first dielectric film 14a and the second dielectric film 14b may be different from each other, but it is preferable that they are the same.
  • the thickness of the dielectric film is measured using an optical thickness gauge.
  • the first dielectric film 14a and the second dielectric film 14b are each preferably produced by forming a resin solution containing the resin material as described above into a film and then curing it by heat treatment.
  • Examples of materials that can be used to form the first metal layer 15a and the second metal layer 15b include metals such as aluminum, zinc, titanium, magnesium, tin, and nickel.
  • compositions of the first metal layer 15a and the second metal layer 15b may be different from each other, but are preferably the same.
  • the thickness of the first metal layer 15a and the second metal layer 15b is preferably 5 nm or more and 40 nm or less.
  • the thicknesses of the first metal layer 15a and the second metal layer 15b may be different from each other, but are preferably the same.
  • the thickness of the metal layer is measured by observing a cross section of the metallized film along the first direction using a transmission electron microscope (TEM).
  • TEM transmission electron microscope
  • the first metal layer 15a and the second metal layer 15b are preferably formed by depositing a metal such as that described above onto the main surfaces of the first dielectric film 14a and the second dielectric film 14b, respectively.
  • the first external electrode 12a is provided on one end surface of the element body 11. More specifically, the first external electrode 12a is connected to the first metal layer 15a by contacting the end of the first metal layer 15a exposed on one end surface of the element body 11. On the other hand, the first external electrode 12a is not connected to the second metal layer 15b.
  • the second external electrode 12b is provided on the other end surface of the element body 11. More specifically, the second external electrode 12b is connected to the second metal layer 15b by contacting the end of the second metal layer 15b exposed on the other end surface of the element body 11. On the other hand, the second external electrode 12b is not connected to the first metal layer 15a.
  • the constituent materials of the first external electrode 12a and the second external electrode 12b include metals such as zinc, aluminum, tin, and zinc-aluminum alloys.
  • compositions of the first external electrode 12a and the second external electrode 12b may be different from each other, but are preferably the same.
  • the first external electrode 12a and the second external electrode 12b are preferably formed by spraying a metal such as that described above onto one end face and the other end face of the body 11, respectively.
  • the first pull-out terminal 20a is electrically connected to the first external electrode 12a.
  • the first pull-out terminal 20a is electrically connected to the first external electrode 12a via a joining member such as solder.
  • the first pull-out terminal 20a may extend in a first direction D1.
  • the second pull-out terminal 20b is electrically connected to the second external electrode 12b.
  • the second pull-out terminal 20b is electrically connected to the second external electrode 12b via a joining member such as solder.
  • the second pull-out terminal 20b may extend in the first direction D1.
  • the directions in which the first pull-out terminal 20a and the second pull-out terminal 20b extend may be parallel. However, the directions in which the first pull-out terminal 20a and the second pull-out terminal 20b extend do not have to be parallel.
  • the first pull-out terminal 20a and the second pull-out terminal 20b may each have a plate-like shape or a linear (rod-like) shape, for example.
  • the first pull-out terminal 20a and the second pull-out terminal 20b may each have a shape with a partially bent portion.
  • the constituent material of the first pull-out terminal 20a and the second pull-out terminal 20b may be, for example, a metal such as copper, oxygen-free copper, aluminum, or an alloy containing at least one of these.
  • the constituent material of the first pull-out terminal 20a and the second pull-out terminal 20b is preferably copper or oxygen-free copper.
  • the constituent material of the first pull-out terminal 20a and the second pull-out terminal 20b is a copper-based material
  • oxygen-free copper copper: 99.96% by weight or more
  • tough pitch copper copper: 99.90% by weight or more
  • phosphorus deoxidized copper copper: 99.90% by weight or more, phosphorus: 0.015% by weight or more, 0.040% by weight or less
  • etc. may be used.
  • the first pull-out terminal 20a and the second pull-out terminal 20b are each used as terminals for electrically connecting the capacitor element 10 to an object to be mounted, for example, when mounting the capacitor 1 to the object to be mounted.
  • a welding method such as laser welding or resistance welding is used.
  • laser welding has the advantage that welding can be completed in a short time by using localized heating, thereby reducing welding distortion.
  • the capacitor element 10 is housed inside the metal case 30 so that the first pull-out terminal 20a and the second pull-out terminal 20b protrude toward the outside.
  • the shape of the metal case 30 is, for example, a cylindrical shape with a bottom and an opening 31 at one end in the first direction D1, as shown in Figures 1, 2, and 3.
  • the inner surface of the metal case 30 includes a first inner surface 32 facing the opening 31 in the first direction D1, and a second inner surface 33 (including four surfaces in the example shown in Figures 2 and 3) extending from the first inner surface 32 toward the opening 31 in the first direction D1.
  • the metal that constitutes the metal case 30 may be, for example, an elemental metal such as aluminum, magnesium, iron, stainless steel, or copper, or an alloy that contains at least one of these elemental metals. Of these, it is preferable that the metal case 30 contains aluminum or an aluminum alloy.
  • the metal case 30 is manufactured by a method such as impact molding.
  • the insulating member 40 is housed inside the metal case 30.
  • the insulating member 40 positions the capacitor element 10 so that the first pull-out terminal 20a does not come into contact with the metal case 30. Furthermore, the insulating member 40 positions the capacitor element 10 so that the second pull-out terminal 20b does not come into contact with the metal case 30.
  • insulating member 40 positions capacitor element 10 so that first pull-out terminal 20a does not come into contact with metal case 30, and so that second pull-out terminal 20b does not come into contact with metal case 30, thereby ensuring electrical insulation between capacitor element 10 and metal case 30. In this way, in capacitor 1, electrical insulation between capacitor element 10 and metal case 30 can be ensured by the simple structure of insulating member 40.
  • the insulating member 40 may be provided between the first pull-out terminal 20a and the first inner surface 32 of the metal case 30 in the first direction D1. More specifically, as shown in FIG. 2, the insulating member 40 may have a first portion 40a provided between the first pull-out terminal 20a and the first inner surface 32 of the metal case 30 in the first direction D1. In the example shown in FIG. 2, the first portion 40a of the insulating member 40 extends in the second direction D2.
  • the insulating member 40 does not have to be provided between the first pull-out terminal 20a and the first inner surface 32 of the metal case 30 in the first direction D1.
  • the insulating member 40 may be in contact with the first inner surface 32 of the metal case 30 in the first direction D1. More specifically, as shown in FIG. 2, the first portion 40a of the insulating member 40 may be in contact with the first inner surface 32 of the metal case 30 in the first direction D1.
  • the insulating member 40 may be in contact with the first inner surface 32 of the metal case 30 in the first direction D1. More specifically, as shown in FIG. 3, the insulating member 40 may have a second portion 40b that is in contact with the first inner surface 32 of the metal case 30 in the first direction D1. In the example shown in FIG. 3, the second portion 40b of the insulating member 40 extends in the third direction D3.
  • the insulating member 40 does not have to be in contact with the first inner surface 32 of the metal case 30 in the first direction D1.
  • the insulating member 40 may be provided between the first pull-out terminal 20a and the second inner surface 33 of the metal case 30 in a second direction D2 perpendicular to the first direction D1. More specifically, as shown in FIG. 2, the insulating member 40 may have a third portion 40c provided between the first pull-out terminal 20a and the second inner surface 33 of the metal case 30 in the second direction D2. In the example shown in FIG. 2, the third portion 40c of the insulating member 40 extends in the first direction D1 while being connected to the first portion 40a.
  • the insulating member 40 does not have to be provided between the first pull-out terminal 20a and the second inner surface 33 of the metal case 30 in the second direction D2.
  • the insulating member 40 may be in contact with the first pull-out terminal 20a in the second direction D2. More specifically, as shown in FIG. 2, the third portion 40c of the insulating member 40 may be in contact with the first pull-out terminal 20a in the second direction D2.
  • the insulating member 40 does not have to be in contact with the first pull-out terminal 20a in the second direction D2.
  • the insulating member 40 may be provided between the second pull-out terminal 20b and the first inner surface 32 of the metal case 30 in the first direction D1. More specifically, as shown in FIG. 2, the insulating member 40 may have a fourth portion 40d provided between the second pull-out terminal 20b and the first inner surface 32 of the metal case 30 in the first direction D1. In the example shown in FIG. 2, the fourth portion 40d of the insulating member 40 extends in the second direction D2 at a position away from the first portion 40a.
  • the insulating member 40 does not have to be provided between the second pull-out terminal 20b and the first inner surface 32 of the metal case 30 in the first direction D1.
  • the fourth portion 40d of the insulating member 40 may be in contact with the first inner surface 32 of the metal case 30 in the first direction D1.
  • the insulating member 40 may have a fifth portion 40e that contacts the first inner surface 32 of the metal case 30 in the first direction D1.
  • the fifth portion 40e of the insulating member 40 extends in the third direction D3 at a position away from the second portion 40b.
  • the first part 40a, the second part 40b, the fourth part 40d, and the fifth part 40e of the insulating member 40 may be connected to each other, may not be connected to each other, or may not be connected in part.
  • the insulating member 40 may be provided between the second pull-out terminal 20b and the second inner surface 33 of the metal case 30 in the second direction D2. More specifically, as shown in FIG. 2, the insulating member 40 may have a sixth portion 40f provided between the second pull-out terminal 20b and the second inner surface 33 of the metal case 30 in the second direction D2. In the example shown in FIG. 2, the sixth portion 40f of the insulating member 40 extends in the first direction D1 while being connected to the fourth portion 40d.
  • the insulating member 40 does not have to be provided between the second pull-out terminal 20b and the second inner surface 33 of the metal case 30 in the second direction D2.
  • the insulating member 40 may be in contact with the second pull-out terminal 20b in the second direction D2. More specifically, as shown in FIG. 2, the sixth portion 40f of the insulating member 40 may be in contact with the second pull-out terminal 20b in the second direction D2.
  • the insulating member 40 does not have to be in contact with the second pull-out terminal 20b in the second direction D2.
  • Examples of materials that can be used to form the insulating member 40 include insulating materials such as resin and ceramic.
  • the insulating member 40 may be a member made of the insulating material described above, or a member in which a conductor made of a conductive material such as metal is coated with an insulating material.
  • the filled resin 50 is filled inside the metal case 30 so as to embed the capacitor element 10.
  • the capacitor element 10 is held inside the metal case 30.
  • the filled resin 50 is filled between the capacitor element 10 and the metal case 30, more specifically, between the outer surface of the capacitor element 10 and the inner surface of the metal case 30. Furthermore, inside the metal case 30, the filled resin 50 is filled not only between the capacitor element 10 and the metal case 30, but also in the area from the opening 31 of the metal case 30 to the capacitor element 10.
  • the filling resin 50 it is preferable to appropriately select a resin with low moisture permeability from the viewpoint of suppressing the infiltration of moisture into the capacitor element 10, and examples thereof include epoxy resin, silicone resin, urethane resin, etc.
  • examples of the hardener for the epoxy resin include an amine hardener, an imidazole hardener, etc.
  • the filling resin 50 only the above-mentioned resin may be used, but in order to improve strength, a resin to which a reinforcing agent has been added may also be used.
  • reinforcing agents include silica and alumina.
  • the thickness of the filling resin 50 at the opening 31 of the metal case 30 is large.
  • the thickness of the filling resin 50 at the opening 31 of the metal case 30 is preferably sufficiently large within the range that allows for the volume (physical size) of the entire capacitor 1, and specifically, is preferably 2 mm or more, and more preferably 4 mm or more.
  • the thickness of the filling resin 50 for the capacitor element 10 is made larger on the opening 31 side of the metal case 30 than on the first inner surface 32 side by arranging the capacitor element 10 on the opening 31 side of the metal case 30 inside the metal case 30.
  • the thickness of the filling resin 50 is measured, for example, using a soft X-ray device if it is in a non-destructive state, and using a length measuring device such as a caliper if it is in a destructive state.
  • the relationship between the height of the metal case 30 and the height of the filled resin 50 in the first direction D1 is such that the thickness of the filled resin 50 at the opening 31 of the metal case 30 is as large as possible, and may be up to a position on the inside of the metal case 30, may be just about to the top, or may overflow slightly due to surface tension.
  • the inner surface of the metal case 30 is provided with a protrusion 35 that protrudes toward the capacitor element 10 at a position where the insulating member 40 is not present.
  • the protrusion 35 protrudes from the inner surface of the metal case 30 toward the element body 11 at a position where the insulating member 40 is not present.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is smaller than the shortest distance between the first pull-out terminal 20a and the metal case 30.
  • the shortest distance between the capacitor element 10 and the protrusion 35 corresponds to the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 corresponds to the shortest distance between the body 11 of the capacitor element 10 and the protrusion 35 in the first direction D1.
  • the shortest distance between the first pull-out terminal 20a and the metal case 30 corresponds to the shortest distance F1 between the first pull-out terminal 20a and the metal case 30 in the first direction D1.
  • the shortest distance between the first pull-out terminal 20a and the metal case 30 may also correspond to the shortest distance between the first pull-out terminal 20a and the metal case 30 in the second direction D2.
  • the shortest distance between the first pull-out terminal 20a and the metal case 30 may also correspond to the shortest distance between the first pull-out terminal 20a and the metal case 30 in the third direction D3.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 is smaller than the shortest distance F1 between the first pull-out terminal 20a and the metal case 30 in the first direction D1.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is smaller than the shortest distance between the second pull-out terminal 20b and the metal case 30.
  • the shortest distance between the second pull-out terminal 20b and the metal case 30 corresponds to the shortest distance F2 between the second pull-out terminal 20b and the metal case 30 in the first direction D1.
  • the shortest distance between the second pull-out terminal 20b and the metal case 30 may also correspond to the shortest distance between the second pull-out terminal 20b and the metal case 30 in the second direction D2.
  • the shortest distance between the second pull-out terminal 20b and the metal case 30 may also correspond to the shortest distance between the second pull-out terminal 20b and the metal case 30 in the third direction D3.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 is smaller than the shortest distance F2 between the second pull-out terminal 20b and the metal case 30 in the first direction D1.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is smaller than the shortest distance between the first lead-out terminal 20a and the metal case 30 (in the example shown in FIG. 2, the shortest distance F1 in the first direction D1 between the first lead-out terminal 20a and the metal case 30) and the shortest distance between the second lead-out terminal 20b and the metal case 30 (in the example shown in FIG. 2, the shortest distance F2 in the first direction D1 between the second lead-out terminal 20b and the metal case 30), so that the capacitor element 10 and the protrusion 35 are in close proximity (in the example shown in FIG.
  • the capacitor element 10 and the protrusion 35 are in close proximity in the first direction D1). Therefore, in the capacitor 1, heat generated in the capacitor element 10 is easily diffused to the protrusion 35, and the capacitor element 10 is easily cooled. In this way, in the capacitor 1, the cooling function of the capacitor element 10 can be improved by using a simple structure of the protrusions 35 provided on the inner surface of the metal case 30 (in the example shown in FIG. 2, the first inner surface 32).
  • capacitor 1 if the shortest distance between first pull-out terminal 20a and metal case 30 is less than the shortest distance between capacitor element 10 and protrusion 35, the first pull-out terminal 20a and metal case 30 will come close to each other, causing discharge between the first pull-out terminal 20a and metal case 30, impairing the capacitor's function. Also, in capacitor 1, if the shortest distance between second pull-out terminal 20b and metal case 30 is less than the shortest distance between capacitor element 10 and protrusion 35, the second pull-out terminal 20b and metal case 30 will come close to each other, causing discharge between the second pull-out terminal 20b and metal case 30, impairing the capacitor's function.
  • the capacitor 1 has a simple structure of the insulating member 40 and the protrusions 35, which allows for both ensuring electrical insulation between the capacitor element 10 and the metal case 30 and improving the cooling function of the capacitor element 10.
  • the case molded capacitor described in Patent Document 1 in addition to the insulating heat transfer layer, it is necessary to provide a molded resin for molding the capacitor element and the insulating heat transfer layer. Therefore, the case molded capacitor described in Patent Document 1 not only has a complex structure, but also has problems such as difficulty in managing the manufacturing process. In contrast, with Capacitor 1, simply by providing the simple structure of insulating member 40 and protrusions 35, it is possible to ensure electrical insulation between capacitor element 10 and metal case 30 and improve the cooling function of capacitor element 10. Furthermore, Capacitor 1 can simplify the manufacturing process, making it easier to manage the manufacturing process.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is preferably 0 mm or more and 5 mm or less.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 is preferably 0 mm or more and 5 mm or less. In this case, in the capacitor 1, the capacitor element 10 and the protrusion 35 are sufficiently close to each other, so that the cooling function of the capacitor element 10 is sufficiently improved.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is particularly preferably 0 mm.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 is particularly preferably 0 mm.
  • the capacitor element 10 and the protrusion 35 are separated in the first direction D1, but it is particularly preferred that the capacitor element 10 and the protrusion 35 are in contact in the first direction D1.
  • the shortest distance between the capacitor element and the protrusion is determined by observing the cross section of the capacitor at multiple points, such as in Figures 2 and 3.
  • the shortest distance between the lead-out terminal and the metal case is determined by observing the cross section of the capacitor at multiple points, as shown in Figure 2.
  • the thermal conductivity of the metal case 30 is higher than the thermal conductivity of the filling resin 50.
  • the protrusion 35 may protrude from the first inner surface 32 of the metal case 30 in the first direction D1.
  • the protrusion 35 may protrude from the second inner surface 33 of the metal case 30 in the second direction D2, or may protrude from the second inner surface 33 of the metal case 30 in the third direction D3.
  • the protrusion 35 may be in contact with the insulating member 40 in a second direction D2 perpendicular to the first direction D1. More specifically, as shown in FIG. 2, the protrusion 35 may be in contact with the first portion 40a and the fourth portion 40d of the insulating member 40 in the second direction D2. In this case, the insulating member 40 is positioned in the second direction D2 by the protrusion 35.
  • the protrusion 35 does not have to be in contact with the insulating member 40 in the second direction D2. More specifically, the protrusion 35 does not have to be in contact with the first portion 40a and the fourth portion 40d of the insulating member 40 in the second direction D2.
  • the protrusion 35 may be in contact with only one of the first portion 40a and the fourth portion 40d of the insulating member 40 in the second direction D2.
  • the protrusion 35 may be in contact with the insulating member 40 in a third direction D3 perpendicular to the first direction D1 and the second direction D2. More specifically, as shown in FIG. 3, the protrusion 35 may be in contact with the second portion 40b and the fifth portion 40e of the insulating member 40 in the third direction D3. In this case, the insulating member 40 is positioned in the third direction D3 by the protrusion 35.
  • the protrusion 35 does not have to be in contact with the insulating member 40 in the third direction D3. More specifically, the protrusion 35 does not have to be in contact with the second portion 40b and the fifth portion 40e of the insulating member 40 in the third direction D3.
  • the protrusion 35 may contact only one of the second portion 40b and the fifth portion 40e of the insulating member 40 in the third direction D3.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 is equal to or smaller than the shortest distance G between the capacitor element 10 and the insulating member 40 in the first direction D1.
  • the shortest distance E between the capacitor element 10 and the protrusion 35 in the first direction D1 may be smaller than the shortest distance G between the capacitor element 10 and the insulating member 40 in the first direction D1, or may be the same as the shortest distance G between the capacitor element 10 and the insulating member 40 in the first direction D1.
  • the protrusion 35 will protrude in the first direction D1 relative to the insulating member 40.
  • the surface of the protrusion 35 facing the capacitor element 10 will be at a height position closer to the capacitor element 10 in the first direction D1 than the surface of the insulating member 40 facing the capacitor element 10.
  • the surfaces of the protrusion 35 and the insulating member 40 facing the capacitor element 10 will be at the same height position in the first direction D1.
  • the dimension S of the protrusion 35 in the first direction D1 is equal to or greater than the dimension T of the insulating member 40 in the first direction D1.
  • the dimension S of the protrusion 35 in the first direction D1 may be greater than the dimension T of the insulating member 40 in the first direction D1, or may be the same as the dimension T of the insulating member 40 in the first direction D1.
  • the protrusion 35 in the first direction D1 is greater than the dimension T of the insulating member 40 in the first direction D1
  • the protrusion 35 will protrude in the first direction D1 relative to the insulating member 40.
  • the surface of the protrusion 35 facing the capacitor element 10 will be at a height position closer to the capacitor element 10 in the first direction D1 than the surface of the insulating member 40 facing the capacitor element 10.
  • the capacitor element 10 is separated from the first inner surface 32 of the metal case 30.
  • the state in which the capacitor element 10 is separated from the first inner surface 32 of the metal case 30 can be achieved, for example, by the following methods 1 to 3.
  • Metal case 30 (Method 1) With capacitor element 10 lifted up by a jig or the like so as to be separated from first inner surface 32 of metal case 30 , filling resin 50 is filled into metal case 30 .
  • Method 3 By tilting the extension direction of at least one of the third portion 40c and the sixth portion 40f of the insulating member 40 from the first direction D1, the distance between the third portion 40c and the sixth portion 40f in the second direction D2 is made smaller on the first inner surface 32 side of the metal case 30 than the total dimension in the second direction D2 of the capacitor element 10, the first pull-out terminal 20a, and the second pull-out terminal 20b, and the capacitor element 10 is positioned away from the first inner surface 32 of the metal case 30.
  • one capacitor element 10 is stored inside one metal case 30, but multiple capacitor elements 10 may be stored inside one metal case 30.
  • At least one capacitor element 10 When multiple capacitor elements 10 are stored inside one metal case 30, it is sufficient for at least one capacitor element 10 to have a configuration in which the shortest distance between the capacitor element 10 and the protrusion 35 is smaller than the shortest distance between the first pull-out terminal 20a and the metal case 30 and the shortest distance between the second pull-out terminal 20b and the metal case 30, and it is particularly preferable for this configuration to be true for all capacitor elements 10.
  • the protrusions 35 are not only provided toward the capacitor elements 10, but may also be provided toward the gap between adjacent capacitor elements 10. In this case, both adjacent capacitor elements 10 are more likely to be cooled.
  • one protrusion 35 is provided toward one capacitor element 10, but multiple protrusions 35 may be provided toward one capacitor element 10.
  • the shortest distance between the capacitor element 10 and the protrusion 35 is smaller than the shortest distance between the first pull-out terminal 20a and the metal case 30 and the shortest distance between the second pull-out terminal 20b and the metal case 30 for at least one protrusion 35, and it is particularly preferable that this be the case for all protrusions 35.
  • the capacitor of the present invention is useful, for example, as a smoothing capacitor that constitutes a power conversion device (e.g., an inverter) for in-vehicle use.
  • a power conversion device e.g., an inverter
  • a capacitor element having an element body and external electrodes provided on end faces of the element body; A lead terminal electrically connected to the external electrode; a metal case in which the capacitor element is housed so that the lead-out terminal protrudes outward; an insulating member that is housed inside the metal case and that positions the capacitor element so that the lead terminals do not come into contact with the metal case; a filling resin filled inside the metal case so as to embed the capacitor element, a protrusion is provided on an inner surface of the metal case at a position where the insulating member is not present, the protrusion protruding toward the capacitor element;
  • the capacitor is characterized in that the shortest distance between the capacitor element and the protrusion is shorter than the shortest distance between the lead-out terminal and the metal case.
  • ⁇ 2> The capacitor according to ⁇ 1>, wherein the shortest distance between the capacitor element and the protrusion is 0 mm or more and 5 mm or less.
  • the metal case has a bottomed cylindrical shape having an opening at one end in the first direction,
  • ⁇ 5> The capacitor according to ⁇ 3> or ⁇ 4>, wherein the insulating member is provided between the lead-out terminal and the first inner surface of the metal case in the first direction.
  • ⁇ 6> The capacitor according to ⁇ 5>, wherein the insulating member is in contact with the first inner surface of the metal case in the first direction.
  • ⁇ 7> The capacitor according to any one of ⁇ 3> to ⁇ 6>, wherein the insulating member is provided between the lead-out terminal and the second inner surface of the metal case in a second direction perpendicular to the first direction.
  • ⁇ 9> The capacitor according to any one of ⁇ 3> to ⁇ 8>, wherein the protrusion protrudes from the first inner surface of the metal case in the first direction.
  • ⁇ 10> The capacitor according to any one of ⁇ 3> to ⁇ 9>, wherein the protrusion is in contact with the insulating member in a second direction perpendicular to the first direction.
  • ⁇ 11> The capacitor according to any one of ⁇ 3> to ⁇ 10>, wherein the shortest distance in the first direction between the capacitor element and the protrusion is equal to or shorter than the shortest distance in the first direction between the capacitor element and the insulating member.
  • ⁇ 12> The capacitor according to any one of ⁇ 3> to ⁇ 11>, wherein a dimension of the protrusion in the first direction is equal to or greater than a dimension of the insulating member in the first direction.
  • Capacitor 10 Capacitor element 11 Body 12a First external electrode 12b Second external electrode 13a First metallized film 13b Second metallized film 14a First dielectric film 14aa First main surface 14ab of first dielectric film Second main surface 14b of first dielectric film Second dielectric film 14ba First main surface 14bb of second dielectric film Second main surface 15a of second dielectric film First metal layer 15b Second metal layer 20a First lead terminal 20b Second lead terminal 30 Metal case 31 Opening 32 First inner surface 33 Second inner surface 35 Protrusion 40 Insulating member 40a First portion 40b Second portion 40c Third portion 40d Fourth portion 40e Fifth portion 40f Sixth portion 50 Filling resin D1 First direction D2 Second direction D3 Third direction E Shortest distance F1 in the first direction between the capacitor element and the protrusion Shortest distance F2 in the first direction between the first lead terminal and the metal case; Shortest distance G in the first direction between the second lead terminal and the metal case; Shortest distance S in the first direction between the capacitor element and the insulating member; Dimension T of the pro

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
PCT/JP2023/028667 2022-10-12 2023-08-07 コンデンサ Ceased WO2024079967A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2024551239A JPWO2024079967A1 (https=) 2022-10-12 2023-08-07

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-163904 2022-10-12
JP2022163904 2022-10-12

Publications (1)

Publication Number Publication Date
WO2024079967A1 true WO2024079967A1 (ja) 2024-04-18

Family

ID=90669389

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/028667 Ceased WO2024079967A1 (ja) 2022-10-12 2023-08-07 コンデンサ

Country Status (2)

Country Link
JP (1) JPWO2024079967A1 (https=)
WO (1) WO2024079967A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54140245U (https=) * 1978-03-23 1979-09-28
JPS5771322U (https=) * 1980-10-16 1982-04-30
JPS60121633U (ja) * 1984-01-27 1985-08-16 株式会社村田製作所 注型形電子部品
JPH054452U (ja) * 1991-07-04 1993-01-22 松下電器産業株式会社 密閉型コンデンサ
WO2019146751A1 (ja) * 2018-01-25 2019-08-01 株式会社村田製作所 フィルムコンデンサ、及び、フィルムコンデンサ用の外装ケース

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54140245U (https=) * 1978-03-23 1979-09-28
JPS5771322U (https=) * 1980-10-16 1982-04-30
JPS60121633U (ja) * 1984-01-27 1985-08-16 株式会社村田製作所 注型形電子部品
JPH054452U (ja) * 1991-07-04 1993-01-22 松下電器産業株式会社 密閉型コンデンサ
WO2019146751A1 (ja) * 2018-01-25 2019-08-01 株式会社村田製作所 フィルムコンデンサ、及び、フィルムコンデンサ用の外装ケース

Also Published As

Publication number Publication date
JPWO2024079967A1 (https=) 2024-04-18

Similar Documents

Publication Publication Date Title
US20250104912A1 (en) Capacitor, capacitor bank, and outer case for capacitor
US20190131052A1 (en) Reactor
WO2019146755A1 (ja) フィルムコンデンサ、及び、フィルムコンデンサ用の外装ケース
US20040017645A1 (en) Thin surface mounted type solid electrolytic capacitor
KR20080063040A (ko) 전자부품의 리드단자의 구조
CN104681245B (zh) 电感元件
WO2024079967A1 (ja) コンデンサ
WO2025047126A1 (ja) コンデンサモジュール
JP7829038B2 (ja) フィルムコンデンサ
JP7839292B2 (ja) コンデンサ
CN113963950A (zh) 一种电容器母排及电容器
JP7816550B2 (ja) コンデンサ、コンデンサバンク、及び、コンデンサ用外装ケース
JP7698692B2 (ja) コンデンサ
WO2025047029A1 (ja) コンデンサ
JP7228855B2 (ja) フィルムコンデンサ
JP2026068221A (ja) コンデンサモジュール
JP2025153832A (ja) コンデンサモジュール
JP2026011272A (ja) コンデンサモジュール
JP2026068219A (ja) コンデンサモジュール
JP2026068220A (ja) コンデンサモジュール
JP7244032B2 (ja) フィルムコンデンサ
JP2026068218A (ja) コンデンサモジュール
WO2025047116A1 (ja) コンデンサモジュール
WO2025225063A1 (ja) コンデンサモジュール及び電力変換装置
WO2025126705A1 (ja) コンデンサモジュール

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23876976

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2024551239

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 23876976

Country of ref document: EP

Kind code of ref document: A1