WO2016111218A1 - Structure de fusible thermique, et boîte de connexion électrique - Google Patents

Structure de fusible thermique, et boîte de connexion électrique Download PDF

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Publication number
WO2016111218A1
WO2016111218A1 PCT/JP2015/086463 JP2015086463W WO2016111218A1 WO 2016111218 A1 WO2016111218 A1 WO 2016111218A1 JP 2015086463 W JP2015086463 W JP 2015086463W WO 2016111218 A1 WO2016111218 A1 WO 2016111218A1
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WO
WIPO (PCT)
Prior art keywords
conductive path
metal member
substrate
case
fuse structure
Prior art date
Application number
PCT/JP2015/086463
Other languages
English (en)
Japanese (ja)
Inventor
龍弥 大道寺
佑樹 杉沢
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2016111218A1 publication Critical patent/WO2016111218A1/fr

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Classifications

    • 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

  • This relates to a thermal fuse structure that cuts off the electrical connection when the temperature rises.
  • Patent Document 1 a thermal fuse structure that cuts off an electrical connection when the temperature rises is known (for example, see Patent Document 1).
  • the thermal fuse described in Patent Document 1 is provided with a heat-meltable metal between a pair of mounting plates and a member that does not melt in the heat-meltable metal.
  • the non-melting member falls by gravity, and the hot-melt metal is pulled down by the non-melting member, and the electrical connection is cut off.
  • This specification discloses a technique that can more reliably cut off the electrical connection when the temperature rises.
  • a thermal fuse structure disclosed in the present specification is a thermal fuse structure that blocks electrical connection between a first conductive path and a second conductive path provided on a substrate, and includes a first heat-meltable structure. It is connected to the first conductive path via a conductive material, and is connected to the second conductive path via a heat-meltable second conductive material, and the first conductive material and the The metal member having a melting temperature higher than the melting temperature of each of the second conductive materials, and the metal member is biased in a blocking direction that blocks electrical connection between the first conductive path and the second conductive path. And an urging section.
  • the metal member is urged by the urging portion in the direction of cutting off the electrical connection between the first conductive path and the second conductive path, so that the temperature rises and the first When the conductive material and the second conductive material are melted, the metal member is detached from the substrate, and the electrical connection between the first conductive path and the second conductive path is interrupted.
  • the electrical connection between the first conductive path and the second conductive path is made as compared with the conventional case where the member that does not melt is dropped by gravity. It can shut off more reliably.
  • the metal member includes a connection portion to which the first conductive path and the second conductive path are connected, and an extension having a surface extending from the connection portion and spaced from the substrate. And an urging portion that urges the extending portion in the blocking direction.
  • the metal member is a thin flat plate and is provided so as to be attached to the substrate.
  • the metal member is to be removed by urging the side end surface of the metal member, it is difficult to urge the metal member because the thickness of the metal member is thin.
  • the extending portion is urged, so that the metal member can be urged more reliably.
  • the extending portion may extend from the connection portion to the opposite side of the substrate, and the urging portion may urge the extending portion in a direction substantially parallel to the substrate.
  • the metal member can be urged in the blocking direction by urging the extending portion in a direction substantially parallel to the substrate by the urging portion.
  • a through hole is formed in the substrate between the first conductive path and the second conductive path, the biasing portion faces the substrate, and the first conductive path and the The metal member may be urged in a direction substantially perpendicular to the substrate through the through hole from the side opposite to the second conductive path.
  • the metal member by urging the metal member in a direction substantially perpendicular to the substrate through the through hole from the opposite side to the first conductive path and the second conductive path by the urging portion, The metal member can be urged in the blocking direction.
  • thermo fuse structure according to claim 1, wherein an electrical junction box disclosed in the present specification interrupts electrical connection between the first conductive path and the second conductive path. And a substrate on which the first conductive path and the second conductive path are provided, a heating element mounted on the substrate, and a housing to which the substrate is fixed.
  • the electrical connection between the first conductive path and the second conductive path can be more reliably interrupted when the temperature rises.
  • the housing includes a first case to which the substrate is fixed and a second case to be assembled to the first case, and the biasing portion is provided in the second case.
  • the urging portion abuts on the metal member when the first case and the second case are assembled, and bends the metal member in a direction opposite to the blocking direction. Energized in the shut-off direction.
  • the metal member is attached in the blocking direction for blocking the electrical connection between the first conductive path and the second conductive path by the work of assembling the first case and the second case.
  • the urging portion can be deflected to urge. For this reason, working efficiency improves compared with the case where the operation
  • the electrical connection can be more reliably interrupted when the temperature rises.
  • Sectional drawing which simplifies and shows the electrical junction box which concerns on Embodiment 1.
  • Sectional drawing which simplifies and shows the electrical-connection box when a 1st electrically conductive material and a 2nd electrically conductive material fuse
  • Sectional drawing which simplifies and shows the electrical junction box which concerns on Embodiment 2.
  • Sectional drawing which simplifies and shows the electrical junction box which concerns on Embodiment 3.
  • Sectional drawing which simplifies and shows the electrical junction box which concerns on other embodiment
  • the electrical junction box 1 is a device that is mounted on a vehicle (not shown) and that turns on / off current supplied from a power source to a load such as an in-vehicle electrical component.
  • the electrical junction box 1 includes a synthetic resin case 10, a printed circuit board 11 accommodated inside the case 10, a heating element 12, and a thermal fuse structure 13.
  • the case 10 is an example of a housing.
  • the printed board 11 is an example of a board.
  • the arrow P indicates the up and down direction, and the upper side of the arrow P will be referred to as the upper side, and the lower side will be described as the lower side.
  • the arrow line Q indicates the horizontal direction, the left side of the arrow line Q is set as the left side, and the right side is described as the right side.
  • Case 10 includes a lower case 10A and an upper case 10B.
  • the upper case 10B is provided with a power supply side connector (not shown) to which a power supply is connected and a load side connector (not shown) to which a load such as an in-vehicle electrical component is connected.
  • the lower case 10A is an example of a “first case”
  • the upper case 10B is an example of a “second case”.
  • the printed circuit board 11 is fixed to the lower case 10A.
  • the printed circuit board 11 is provided with a conductive path made of copper or the like by a known printed wiring technique, and the heating element 12 and a part of the thermal fuse structure 13 are mounted thereon.
  • the heating element 12 is an FET (Field Effect Transistor), an IPD (Intelligent Power Device), a coil, or the like.
  • the heating element 12 is not limited to these.
  • At least a first conductive path 14, a second conductive path 15, and a third conductive path 16 are provided on the printed board 11.
  • One end of the third conductive path 16 is connected to the power supply side connector (not shown), and the other end is connected to the heating element 12.
  • One end of the first conductive path 14 is connected to the heating element 12, and the other end is connected to a metal member 17 described later of the thermal fuse structure 13.
  • the second conductive path 15 has one end connected to the metal member 17 and the other end connected to a load-side connector (not shown).
  • the thermal fuse structure 13 includes a metal member 17 mounted on the printed circuit board 11 and an urging portion 18 formed integrally with the upper case 10B.
  • the metal member 17 is formed by bending an elongated metal plate into an L shape.
  • the portion of the metal member 17 that extends in the horizontal direction (the direction indicated by the arrow Q) in FIG. 1 is referred to as a connection portion 17A, and is approximately on the opposite side from the left edge of the connection portion 17A to the printed board 11.
  • a portion extending vertically is referred to as an extension portion 17B.
  • the surface facing the left side of the extending portion 17 ⁇ / b> B is an example of “a surface provided apart from the substrate”.
  • the connecting portion 17A has a downward facing surface connected to the first conductive path 14 via the solder 19 and connected to the second conductive path 15 via the solder 20.
  • the solder 19 is an example of a “heat-melting first conductive material”
  • the solder 20 is an example of a “heat-melting second conductive material”.
  • the heating element 12 When the heating element 12 generates heat, the heat is transmitted to the solders 19 and 20 through the first conductive path 14 or as radiant heat, and the temperature of the solders 19 and 20 rises.
  • the melting temperature of the solders 19 and 20 is higher than the temperature that rises due to the heat transmitted when the temperature of the heating element 12 is within a normal range, and the temperature at which the printed board 11 and the case 10 are ignited or smoked. Let it be a lower temperature.
  • the melting temperature of the metal member 17 is higher than the melting temperatures of the solders 19 and 20.
  • the urging portion 18 has an arm portion 21 extending in a bar shape downward from the upper wall of the upper case 10B, and a protrusion 22 protruding from the distal end portion of the arm portion 21 toward the extending portion 17B side (right side in FIG. 1). And have.
  • the arm portion 21 is provided substantially above the extension portion 17B, and is assembled in a state where the protrusion 22 is bent to the left side by contacting the extension portion 17B. For this reason, the extension part 17B is always urged
  • the right side is an example of “blocking direction” and “direction substantially parallel to the substrate”.
  • assembling the urging portion 18 in a bent state can be performed by assembling the lower case 10A and the upper case 10B.
  • the protrusion 22 has an inclined surface 22A that is inclined to the right when not bent.
  • the biasing portion 18 abuts the inclined surface 22 ⁇ / b> A against the metal member 17, and the arm portion 21 is bent to the left side by the reaction force received by the protrusion 22 from the metal member 17. As a result, the biasing portion 18 is assembled in a bent state.
  • the urging portion 18 connects the metal member 17 to the first conductive path 14 and the second conductive path 15. Since it is energized in the blocking direction to block, when the temperature rises and the solders 19 and 20 are melted, the metal member 17 is detached from the printed circuit board 11, and the first conductive path 14 and the second conductive path 15 Is disconnected.
  • the first conductive path 14 and the second conductive path 15 are compared with the case where a member that does not melt is dropped by gravity as in the prior art. The electrical connection can be cut off more reliably.
  • the metal member 17 has an extending portion 17 ⁇ / b> B having a surface provided apart from the printed board 11.
  • the metal member 17 is a thin flat plate and is provided so as to be attached to the printed board 11. In this case, if it is attempted to remove the metal member 17 by urging the side end surface of the metal member 17, it is difficult to urge the metal member 17 because the thickness of the metal member 17 is thin.
  • the extending portion 17 ⁇ / b> B is urged, so that the metal member 17 can be urged more reliably.
  • the thermal fuse structure 13 by urging the extending portion 17B extending from the connecting portion 17A to the opposite side of the printed circuit board 11 by the urging portion 18 in a direction substantially parallel to the printed circuit board 11, The metal member 17 can be urged in the “blocking direction”.
  • the biasing portion 18 can be bent so as to bias the metal member 17 by the work of assembling the lower case 10A and the upper case 10B. For this reason, working efficiency improves compared with the case where the operation
  • the electrical junction box 201 according to the second embodiment includes a thermal fuse structure 213 instead of the thermal fuse structure 13 according to the first embodiment.
  • the metal member 217 according to the second embodiment includes a first extension portion 217B that extends substantially perpendicularly from the right edge of the connection portion 217A to the side opposite to the printed board 11 (upper side in the drawing), and a first extension. It has a second extending portion 217C that extends substantially perpendicularly from the tip of the portion 217B to the opposite side (right side of the drawing) from the connecting portion 217A.
  • the first extension part 217B and the second extension part 217C are examples of “extension part”. Further, in FIG. 3, the surface facing the upper side of the second extending portion 217 ⁇ / b> C is an example of “a surface provided apart from the substrate”.
  • the urging portion 218 has an arm portion 221 that extends in a bar shape from the inner surface of the side wall of the upper case 210B toward the left side, and a protrusion 222 that protrudes downward from the tip portion of the arm portion 221.
  • the arm part 221 is substantially the same in the vertical direction (direction indicated by the arrow P) as the second extension part 217C, and the protrusion 222 abuts on the second extension part 217C from above to bend upward. It is assembled in the state. For this reason, the second extension portion 217C is always urged downward by the elastic force of the arm portion 221 trying to return to the original shape. Below is an example of the “blocking direction”.
  • the metal member 217 When the heating element 12 abnormally generates heat for some reason and the solders 219 and 220 are melted, the metal member 217 is pushed by the urging portion 218 and tilted obliquely by the lever principle with the right end of the connection portion 217A as a fulcrum. As a result, the metal member 217 is detached from the printed circuit board 11, and the electrical connection between the first conductive path 14 and the second conductive path 15 is interrupted.
  • the metal member 217 can be urged in the “cutting direction” by urging the second extending portion 217C downward by the urging portion 218. it can.
  • a printed circuit board 311 is attached to an electrical connection box 301 according to the third embodiment so as to close an opening of a lower case 310 formed in a box shape opening upward.
  • the printed circuit board 311 according to the third embodiment also includes the first conductive path 14, the second conductive path 15, and the third conductive path 16.
  • the metal member 317 is formed in a long and narrow plate shape, and the first conductive path 14 is connected to the surface facing downward via the solder 319 and the second conductive path 15 is connected via the solder 320. ing. As shown in FIG. 4, a through hole 311 ⁇ / b> A is formed in the printed board 311 below the metal member 317.
  • the urging portion 318 is formed integrally with the lower case 310, and includes a first straight portion 318A extending upward from the bottom surface of the lower case 310, and a curve extending in a semicircular shape upward from the upper end of the straight portion 318A. A portion 318B and a second straight portion 318C extending upward from the upper end of the curved portion 318B are provided.
  • the urging portion 318 can be elastically deformed in the vertical direction by bending the curved portion 318B. It is assumed that the position of the upper end of the second straight line portion 318C when the urging portion 318 has a natural length is higher than the surface of the printed board 311.
  • the urging portion 318 is in contact with the metal member 317 from the bottom through the through hole 311A of the printed board 311 and is assembled in a state compressed in the vertical direction. For this reason, the metal member 317 is always urged upward by the elastic force that the urging portion 318 attempts to return to the original shape. That is, the urging portion 318 faces the printed circuit board 311 and urges the metal member 317 upward from the opposite direction side to the first conductive path 14 and the second conductive path 15 through the through hole 311A. .
  • the upper part is an example of “blocking direction” and “direction substantially perpendicular to the substrate”.
  • the heating element 12 When the heating element 12 abnormally generates heat for some reason and the solders 319 and 320 are melted, the metal member 317 is detached from the printed board 311 by being biased upward by the biasing portion 318. Thereby, the electrical connection between the first conductive path 14 and the second conductive path 15 is interrupted.
  • the metal member 317 can be urged in the “cut-off direction” by urging the metal member 317 upward by the urging portion 318.
  • the extending portion 17B is urged to the right by the urging portion 18
  • the direction of urging by the urging unit 18 is not limited to this as long as the electrical connection between the first conductive path 14 and the second conductive path 15 is interrupted.
  • the urging portion 18 may urge the extending portion 17B to the left side.
  • the urging portion 218 may urge the second extending portion 217C upward.
  • the second extending portion 217C may extend to the left in FIG. 3 from the distal end portion of the first extending portion 217B. That is, the metal member 217 may be formed in a U shape. And the urging
  • biasing part 18 may urge the 2nd extension part 217C upwards.
  • the printed circuit board 11 on which the conductive path is printed is described as an example.
  • the board is not limited to the printed board 11.
  • a metal bus bar may be attached to a substrate on which a conductive path is not printed.
  • the bus bar is an example of a conductive path.
  • the urging portion 18 is integrally provided in the synthetic resin case 10
  • the urging portion 18 may be provided other than the case 10.
  • a biasing portion 418 similar to that of the third embodiment is integrally formed in the housing 50 of the load side connector so as to extend in the horizontal direction.
  • the metal member 17 shown in the first embodiment is fixed to the left and right opposite to the first embodiment, and the extending portion 17 ⁇ / b> B is urged to the left by the urging portion 418 extending from the housing 50. Yes.
  • the biasing portion 18 is made of synthetic resin
  • the urging portion 18 may not be made of synthetic resin.
  • a metal leaf spring, torsion spring, coil spring or the like may be fixed to the case 10 as a biasing portion 18 with a screw or the like.
  • the metal member 17 is electrically connected to the heating element 12 via the first conductive path 14
  • the metal member 17 may not be electrically connected to the heating element 12 but may be provided in the vicinity of the heating element 12.
  • the solder 19 and 20 are melted by the radiant heat radiated from the heating element 12, whereby the electrical connection between the first conductive path 14 and the second conductive path 15 can be cut off.
  • the urging unit 18 may be provided on the printed circuit board 11.
  • the urging portion 18 may be integrally formed, or the urging portion 18 formed of metal or the like may be fixed to the printed circuit board 11 with a screw.
  • solder is used as an example of the heat-meltable first conductive material and the heat-meltable second conductive material, but a brazing material such as silver solder may be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)

Abstract

La présente invention concerne une structure de fusible thermique 13 qui déconnecte la connexion électrique entre une première piste conductrice 14 et une seconde piste conductrice 15 qui sont situées sur un substrat 11, la structure de fusible thermique étant pourvue des éléments suivants : un élément métallique 17 qui est connecté à la première piste conductrice 14 par une brasure 19 et connecté à la seconde piste conductrice 15 par une brasure 20, l'élément métallique ayant un plus haut point de fusion que la brasure 19 et la brasure 20 ; et une section de sollicitation 18 qui exerce une sollicitation sur l'élément métallique 17 dans un sens de déconnexion, qui est un sens dans lequel la première piste conductrice 14 serait électriquement déconnectée de la seconde piste conductrice 15.
PCT/JP2015/086463 2015-01-09 2015-12-28 Structure de fusible thermique, et boîte de connexion électrique WO2016111218A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-003079 2015-01-09
JP2015003079A JP6384334B2 (ja) 2015-01-09 2015-01-09 電気接続箱

Publications (1)

Publication Number Publication Date
WO2016111218A1 true WO2016111218A1 (fr) 2016-07-14

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WO (1) WO2016111218A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020025058A (ja) * 2018-08-08 2020-02-13 トヨタ自動車株式会社 半導体装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006196189A (ja) * 2005-01-11 2006-07-27 Uchihashi Estec Co Ltd サーモプロテクタ及びサーモプロテクタの製作方法並びに取付け方法
JP2009289507A (ja) * 2008-05-28 2009-12-10 Hitachi Automotive Systems Ltd 負荷駆動装置およびその負荷駆動装置の過熱保護構造
JP2010522418A (ja) * 2007-03-26 2010-07-01 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 電気的なモジュール内で使用するための温度ヒューズ
JP2012226932A (ja) * 2011-04-19 2012-11-15 Panasonic Corp 温度ヒューズおよびその製造方法
JP2013503441A (ja) * 2009-08-27 2013-01-31 タイコ・エレクトロニクス・コーポレイション 温度ヒューズ
JP2013258013A (ja) * 2012-06-12 2013-12-26 Murata Mfg Co Ltd ヒューズ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11111137A (ja) * 1997-09-30 1999-04-23 Rohm Co Ltd 過熱保護回路
JP4908042B2 (ja) * 2006-04-06 2012-04-04 三菱電機株式会社 回路遮断装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006196189A (ja) * 2005-01-11 2006-07-27 Uchihashi Estec Co Ltd サーモプロテクタ及びサーモプロテクタの製作方法並びに取付け方法
JP2010522418A (ja) * 2007-03-26 2010-07-01 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 電気的なモジュール内で使用するための温度ヒューズ
JP2009289507A (ja) * 2008-05-28 2009-12-10 Hitachi Automotive Systems Ltd 負荷駆動装置およびその負荷駆動装置の過熱保護構造
JP2013503441A (ja) * 2009-08-27 2013-01-31 タイコ・エレクトロニクス・コーポレイション 温度ヒューズ
JP2012226932A (ja) * 2011-04-19 2012-11-15 Panasonic Corp 温度ヒューズおよびその製造方法
JP2013258013A (ja) * 2012-06-12 2013-12-26 Murata Mfg Co Ltd ヒューズ

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