WO2020166445A1 - 回路モジュール - Google Patents

回路モジュール Download PDF

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Publication number
WO2020166445A1
WO2020166445A1 PCT/JP2020/004325 JP2020004325W WO2020166445A1 WO 2020166445 A1 WO2020166445 A1 WO 2020166445A1 JP 2020004325 W JP2020004325 W JP 2020004325W WO 2020166445 A1 WO2020166445 A1 WO 2020166445A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
fuse element
insulating
protection member
circuit board
Prior art date
Application number
PCT/JP2020/004325
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
千智 小森
吉弘 米田
Original Assignee
デクセリアルズ株式会社
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 デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Priority to KR1020247021465A priority Critical patent/KR20240105509A/ko
Priority to CN202080012774.XA priority patent/CN113424289A/zh
Priority to KR1020217024514A priority patent/KR20210105995A/ko
Publication of WO2020166445A1 publication Critical patent/WO2020166445A1/ja

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material

Definitions

  • the present invention relates to a circuit module on which a fuse element is mounted.
  • the present application claims priority based on Japanese Patent Application No. 2019-024470 filed in Japan on February 14, 2019, and the content thereof is incorporated herein.
  • the fuse element has been used as a protection element for various electronic devices such as mobile phones, portable computers, and other electronic devices, and rechargeable electric devices that are equipped with secondary batteries.
  • the fuse element is connected between the first electrode and the second electrode formed on the surface of the insulating substrate, and is connected between the first electrode and the second electrode, and is fused to disconnect the first electrode and the second electrode.
  • the components such as the first electrode, the second electrode and the fusible conductor arranged on the surface of the insulating substrate of the fuse element are usually covered with a case, which protects the inside of the case and facilitates handling. Is improving.
  • a case which protects the inside of the case and facilitates handling. Is improving.
  • the heat inside the fusible conductor due to overcurrent causes a high temperature inside the case, and the air inside the case may expand rapidly.
  • a through hole is provided in the case to release the air or heat rapidly expanded inside the case to the outside (Patent Document 1).
  • the present invention has been made in view of the above circumstances, and a circuit module that is less likely to damage the periphery of the fuse element even if heat or arc generated at the time of melting the fusible conductor of the fuse element is released to the outside.
  • the purpose is to provide.
  • the present invention provides the following means in order to solve the above problems.
  • a circuit module includes a circuit board having a wiring pattern, an insulating protection member arranged on the circuit board, and an insulating protection member on the circuit board via the insulating protection member.
  • a fuse element mounted on the insulating substrate, the plurality of surface electrodes formed on the surface of the insulating substrate, and the plurality of surface electrodes formed by being fused to each other.
  • a plurality of back electrodes formed on the back surface of the insulating substrate and electrically connected to the plurality of front electrodes, and a case that covers the front surface of the insulating substrate.
  • the case has a through hole on the side surface or the top surface, and the fuse element is arranged inside the outer periphery of the insulating protection member when seen in a plan view.
  • the insulating protection member may have a flat plate shape.
  • the insulating protection member includes a conductive portion that electrically connects the back surface electrode of the fuse element and the wiring pattern of the circuit board. It may be configured.
  • the conductive portion is a conductive through hole provided in a surface of the insulating protection member, or a conductive portion provided on an outer peripheral portion of the insulating protection member. It may be a side through hole having a good property.
  • the present invention it is possible to provide a circuit module that is unlikely to damage the surroundings of the fuse element even if heat or arc generated when the fusible conductor of the fuse element is blown is discharged to the outside.
  • FIG. 2 is a sectional view taken along line II-II in FIG. 1.
  • FIG. 2 is a plan view showing a fuse element of the circuit module shown in FIG. 1 with a case omitted. It is a perspective view of the fuse element of the circuit module shown in FIG.
  • FIG. 1 is a plan view of a circuit module according to an embodiment of the present invention.
  • 2 is a sectional view taken along the line II-II of FIG. 1
  • FIG. 3 is a plan view showing the fuse element shown in FIG. 1 with a case omitted
  • FIG. 4 is a plan view of the fuse element shown in FIG. It is a perspective view.
  • the circuit module 1 includes a circuit board 2, an insulating protection member 3 disposed on the circuit board, and a circuit board 2 with the insulating protection member 3 interposed therebetween. And a fuse element 4 mounted thereon.
  • the fuse element 4 is arranged inside the outer periphery of the insulating protection member 3 in a plan view.
  • the circuit board 2 has an insulating sheet 20 and wiring patterns 21a, 21b, 21c, 22 formed on the surface of the insulating sheet 20.
  • the wiring patterns 21a, 21b, 21c are wiring patterns connected to the fuse element 4, and the wiring pattern 22 is a wiring pattern not connected to the fuse element 4.
  • the insulating sheet 20 is not particularly limited as long as it has electrical insulating properties, and a known insulating sheet used for a circuit board such as a resin sheet, a ceramic sheet, or a composite sheet of resin and ceramic particles can be used. ..
  • the resin sheet include an epoxy resin sheet, a phenol resin sheet, and a polyimide sheet.
  • the ceramic sheet examples include an alumina sheet, a glass ceramic sheet, a mullite sheet, and a zirconia sheet.
  • a glass epoxy sheet can be mentioned as an example of a composite sheet.
  • the material of the wiring patterns 21a, 21b, 21c, 22 can be used a general electrode material such as Cu or Ag.
  • the insulating protection member 3 has a function of protecting the wiring patterns 21a, 21b, 21c, 22 of the circuit board 2 from heat and arc emitted from the fuse element 4. Therefore, the outer circumference of the insulating protection member 3 is wider than the outer circumference of the fuse element 4.
  • the distance between the outer circumference of the insulating protection member 3 and the outer circumference of the fuse element 4 varies depending on the size of the fuse element 4 and the usage conditions of the circuit module 1, but is generally within a range of 2 to 3 times the outer shape of the fuse element 4. Is preferred.
  • the insulating protection member 3 is preferably flat. Although the thickness of the insulating protective member 3 varies depending on the heat resistance and thermal conductivity of the insulating protective member 3, it is generally preferable that the thickness is in the range of 100 ⁇ m to 1000 ⁇ m. Further, the outer periphery of the insulating protection member 3 may be raised in a wall shape.
  • the insulating protection member 3 includes a non-conductive portion 30 and a conductive portion 31.
  • the conductive portion 31 electrically connects the wiring patterns 21a, 21b, 21c of the circuit board 2 to the first electrode 41, the second electrode 42, and the first heating element electrode 43 of the fuse element 4.
  • the non-conductive portion 30 is preferably made of a ceramic material having excellent heat resistance and thermal conductivity. Examples of ceramic materials include alumina, glass ceramics, mullite, and zirconia.
  • a general electrode material such as Cu or Ag can be used.
  • the form of the conductive portion 31 is a conductive through hole provided in the surface of the insulating protection member 3.
  • the form of the conductive portion 31 is not particularly limited, and may be a conductive side through hole provided on the outer peripheral portion of the insulating protection member 3.
  • the fuse element 4 has an insulating substrate 40.
  • the insulating substrate 40 has a first electrode 41, a second electrode 42, a first heating element electrode 43, and a second heating element electrode 44 formed thereon.
  • the first electrode 41 includes a first front surface electrode 41a formed on the front surface 40a of the insulating substrate 40, a first rear surface electrode 41c formed on the rear surface 40b of the insulating substrate 40, a first front surface electrode 41a and a first rear surface electrode. It is composed of a castellation 41b for connecting with 41c.
  • the second electrode 42 includes a second front surface electrode 42a formed on the front surface 40a of the insulating substrate 40, a second rear surface electrode 42c formed on the rear surface 40b of the insulating substrate 40, a second front surface electrode 42a and a second rear surface electrode. It is composed of a castellation 42b for connecting with 42c.
  • the first heating element electrode 43 includes a first heating element surface electrode 43a formed on the front surface 40a of the insulating substrate 40, a first heating element rear surface electrode (not shown) formed on the back surface 40b of the insulating substrate 40, and The first heating element front surface electrode 43a and the first heating element rear surface electrode (not shown) are connected to the castellation 43b.
  • the second heating element electrode 44 is composed only of the second heating element surface electrode 44a formed on the surface 40a of the insulating substrate 40.
  • a fusible conductor 45 that electrically cuts off the first surface electrode 41a and the second surface electrode 42a is electrically connected between the first surface electrode 41a and the second surface electrode 42a.
  • the first back surface electrode 41c is the wiring pattern 21a
  • the second back surface electrode 42c is the wiring pattern 21b
  • the first heating element back surface electrode is the wiring pattern 21c, and electrically through the conductive portion 31 of the insulating protection member 3. It is connected.
  • the wiring pattern 21c is electrically connected to an external control element (not shown), and a current is supplied to the first heating element electrode 43 by a signal from the control element.
  • the surface 40 a of the insulating substrate 40 is provided with a heating element 46 and an insulating member 47 that covers the heating element 46.
  • a heating element extraction electrode 48 is formed on the insulating member 47 so as to face the heating element 46.
  • One end of the heating element 46 is electrically connected to the first heating element surface electrode 43a, and the other end is electrically connected to the second heating element surface electrode 44a.
  • One end of the heating element lead-out electrode 48 is electrically connected to the second heating element surface electrode 44a and is also electrically connected to the fusible conductor 45.
  • a flux 49 is applied to the surface of the fusible conductor 45 to prevent oxidation and improve wettability.
  • the fuse element 4 includes a case 50 that covers the surface 40a of the insulating substrate 40.
  • the case 50 has a side surface 51 bonded on the surface of the insulating substrate 40 and a top surface 53 that covers the surface of the insulating substrate 40.
  • the case 50 has a through hole 52 only on the side surface 51.
  • the number and size of the through holes 52 are not particularly limited, but it is preferable that one or more through holes 52 are provided on each of the four side surfaces 51 of the case 50.
  • the case 50 is preferably made of a ceramic material having excellent heat resistance and thermal conductivity.
  • ceramic materials include alumina, glass ceramics, mullite, and zirconia.
  • the first electrode 41, the second electrode 42, the first heating element electrode 43, and the second heating element electrode 44 can be formed by using a general electrode material such as Cu or Ag. On the surfaces of the first electrode 41 and the second electrode 42, Ni/Au plating, Ni/Pd plating, Ni/Pd/Au plating, etc. are coated by a known method such as plating. It is preferable. Accordingly, it is possible to prevent the first electrode 41 and the second electrode 42 from being oxidized, and to prevent a change in rating due to an increase in conduction resistance.
  • the fuse element 4 when the fuse element 4 is reflow-mounted, by melting the low melting point metal forming the connection solder or the outer layer of the fusible conductor 45, which connects the fusible conductor 45 with the first electrode 41 and the second electrode 42, It is possible to prevent the first electrode 41 and the second electrode 42 from being corroded (soldered).
  • the fusible conductor 45 is made of a material that is quickly melted by self-heating (Joule heat) when overcurrent flows or by heat generation of the heating element 46.
  • solder or Pb-free solder whose main component is Sn.
  • Low melting point metals such as In and In can be preferably used.
  • the fusible conductor 45 may be made of a high melting point metal such as Pb, Ag, Cu, or an alloy containing any one of these as a main component, or a laminated body of a low melting point metal and a high melting point metal. It may be.
  • the fuse element 4 when the fuse element 4 is reflow mounted, even if the reflow temperature exceeds the melting temperature of the low melting point metal and the low melting point metal melts, Outflow to the outside can be suppressed and the shape of the soluble conductor 45 can be maintained. Also during melting, the low-melting point metal is melted and the high-melting point metal is eroded (soldered), so that the high-melting point metal can be rapidly melted at a temperature equal to or lower than the melting point.
  • the heating element 46 is a conductive member that generates heat when energized, and has a high resistance such as W, Mo, Ru, Cu, Ag, or an alloy containing these as the main components or a composition or compound containing these. It is made of a conductive material.
  • the heating element 46 is formed by a method in which a paste prepared by mixing a powder of a high resistance conductive material and a resin binder or the like is patterned on the insulating substrate 40 using a screen printing technique and then fired. You can
  • the heating element lead-out electrode 48 has a function of transmitting the heat generated by the heating element 46 to the fusible conductor 45 via the second heating element surface electrode 44a.
  • a material of the heating element extraction electrode 48 a metal material having high thermal conductivity such as Cu or Ag can be used.
  • an insulating member may be interposed between the heating element 46 and the insulating substrate 40 in order to efficiently transfer the heat of the heating element 46 to the fusible conductor 45.
  • the circuit module 1 of this embodiment can be manufactured, for example, as follows. First, the circuit board 2 having the wiring patterns 21a, 21b, and 21c at positions corresponding to the first electrode 41, the second electrode 42, and the first heating element electrode 43 of the fuse element 4, and the front side of the circuit board 2 of the fuse element 4 An insulating protection member 3 corresponding to the first electrode 41, the second electrode 42, and the first heating element electrode 43 and having a conductive portion 31 on the back surface side corresponding to the wiring patterns 21a, 21b, and 21c of the circuit board 2 is prepared.
  • the insulating protection member 3 is mounted on the prepared circuit board 2, and solder is arranged between the wiring patterns 21a, 21b, 21c of the circuit board 2 and the conductive portion 31 of the insulating protection member 3.
  • the fuse element 4 is mounted on the insulating protection member 3, and between the conductive portion 31 of the insulating protection member 3 and the first electrode 41, the second electrode 42, and the first heating element electrode 43 of the fuse element 4. Place the solder on.
  • the solder is heated in the reflow furnace to insulate the wiring patterns 21a, 21b, 21c of the circuit board 2 from the first electrode 41, the second electrode 42, and the first heating element electrode 43 of the fuse element 4. It is electrically connected via the conductive portion 31 of the property protection member 3.
  • the circuit module 1 of this embodiment can be used, for example, as a protection circuit for a battery pack of a lithium ion secondary battery.
  • the circuit module 1 of the present embodiment is less likely to damage the periphery of the fuse element 4 even when an arc is generated in the fuse element 4, and thus is advantageously used as a protection circuit for a battery pack of an electric device that uses a large current. can do.
  • an electric device using a large electric current an electric device using a large electric current exceeding several tens of amps to 100 A, for example, an electric tool such as an electric screwdriver, a transportation device such as a hybrid car, an electric vehicle, an electric assist bicycle Can be mentioned.
  • the first heat generation is performed by a signal from an external control element (not shown).
  • a current is supplied to the body electrode 43.
  • the heating element 46 generates heat, and the heat is transmitted to the fusible conductor 45 via the second heating element surface electrode 44a and the heating element lead-out electrode 48, and the fusible conductor 45 is melted. Then, the current path in the circuit module 1 is cut off.
  • the through hole 52 is formed in the side surface 51 of the case 50 of the fuse element 4, the heat generated when the fusible conductor 45 is melted, the air expanded by the heat, and the arc penetrate. It is discharged from the hole 52. Therefore, the case 50 is unlikely to be damaged when the fusible conductor 45 is melted.
  • the fuse element 4 is arranged inside the outer periphery of the insulating protection member 3 in a plan view, and the surface of the circuit board 2 around the fuse element 4 is insulated. It is protected by the sex protection member 3. Therefore, even if heat or arc generated when the fusible conductor 45 of the fuse element 4 is blown is discharged to the outside through the through hole 52, the periphery of the fuse element 4 is unlikely to be damaged.
  • the fuse element 4 connects the fusible conductor 45 between the first electrode 41 and the second electrode 42, but the number of electrodes is not limited as long as it is two or more.
  • a pair of electrodes may be further provided, and another fusible conductor may be connected between the pair of electrodes.
  • the through hole 52 is provided only on the side surface 51 of the case 50, but the through hole 52 may be provided on the top surface 53.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
PCT/JP2020/004325 2019-02-14 2020-02-05 回路モジュール WO2020166445A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020247021465A KR20240105509A (ko) 2019-02-14 2020-02-05 회로 모듈
CN202080012774.XA CN113424289A (zh) 2019-02-14 2020-02-05 电路模块
KR1020217024514A KR20210105995A (ko) 2019-02-14 2020-02-05 회로 모듈

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-024470 2019-02-14
JP2019024470A JP2020135959A (ja) 2019-02-14 2019-02-14 回路モジュール

Publications (1)

Publication Number Publication Date
WO2020166445A1 true WO2020166445A1 (ja) 2020-08-20

Family

ID=72044728

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/004325 WO2020166445A1 (ja) 2019-02-14 2020-02-05 回路モジュール

Country Status (5)

Country Link
JP (2) JP2020135959A (zh)
KR (2) KR20210105995A (zh)
CN (1) CN113424289A (zh)
TW (1) TW202036632A (zh)
WO (1) WO2020166445A1 (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006185951A (ja) * 2004-12-24 2006-07-13 Sumitomo Wiring Syst Ltd 回路基板への基板用端子の取付構造
JP2010272215A (ja) * 2009-05-19 2010-12-02 Panasonic Corp 電池ユニット
JP2016134317A (ja) * 2015-01-20 2016-07-25 デクセリアルズ株式会社 ヒューズ素子及び回路モジュール

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6782122B2 (ja) * 2016-08-24 2020-11-11 デクセリアルズ株式会社 保護素子、回路モジュール及び保護素子の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006185951A (ja) * 2004-12-24 2006-07-13 Sumitomo Wiring Syst Ltd 回路基板への基板用端子の取付構造
JP2010272215A (ja) * 2009-05-19 2010-12-02 Panasonic Corp 電池ユニット
JP2016134317A (ja) * 2015-01-20 2016-07-25 デクセリアルズ株式会社 ヒューズ素子及び回路モジュール

Also Published As

Publication number Publication date
KR20210105995A (ko) 2021-08-27
TW202036632A (zh) 2020-10-01
CN113424289A (zh) 2021-09-21
JP2020135959A (ja) 2020-08-31
KR20240105509A (ko) 2024-07-05
JP2023126322A (ja) 2023-09-07

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