WO2020095694A1 - Élément actionné thermiquement, disjoncteur, circuit de sécurité et bloc-batterie secondaire - Google Patents

Élément actionné thermiquement, disjoncteur, circuit de sécurité et bloc-batterie secondaire Download PDF

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Publication number
WO2020095694A1
WO2020095694A1 PCT/JP2019/041654 JP2019041654W WO2020095694A1 WO 2020095694 A1 WO2020095694 A1 WO 2020095694A1 JP 2019041654 W JP2019041654 W JP 2019041654W WO 2020095694 A1 WO2020095694 A1 WO 2020095694A1
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WIPO (PCT)
Prior art keywords
breaker
responsive element
side wall
movable piece
contact
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PCT/JP2019/041654
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English (en)
Japanese (ja)
Inventor
恒平 山本
Original Assignee
ボーンズ株式会社
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Filing date
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Application filed by ボーンズ株式会社 filed Critical ボーンズ株式会社
Publication of WO2020095694A1 publication Critical patent/WO2020095694A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting

Definitions

  • the present invention relates to a heat responsive element or the like formed in a plate shape suitable for use in a small breaker.
  • breakers have been used as protective devices (safety circuits) for secondary batteries and motors of various electric devices.
  • Patent Document 1 discloses a breaker to which a bimetal is applied as a heat responsive element.
  • the bimetal is an element that is formed by laminating two kinds of plate-shaped metal materials having different thermal expansion coefficients, and changes the shape according to the temperature change (thermal deformation) to control the conduction state of the contacts.
  • parts such as a fixed piece, a movable piece, a thermo-responsive element, and a PTC thermistor are housed in a case, and terminals of the fixed piece and the movable piece protrude from the case, so that electric equipment Used by being connected to a circuit.
  • the breaker operates when the temperature of the rechargeable battery during charging / discharging rises excessively, or when an abnormal condition occurs, such as when an overcurrent flows through a motor or the like installed in equipment such as automobiles and home appliances. Shut off the current to protect the secondary battery and motor.
  • the breaker used as such a protection device operates accurately following a temperature change (has good temperature characteristics) and has a stable resistance value when energized in order to ensure the safety of the device. Required to be present.
  • the breaker when used as a protection device for a secondary battery or the like equipped in an electric device such as a notebook personal computer, a tablet type personal digital assistant, or a thin multifunctional mobile phone called a smartphone, the above-mentioned breaker is used.
  • miniaturization is required.
  • mobile information terminal devices in recent years, there is a strong tendency for users to miniaturize, and devices newly released by each company tend to be designed small in order to secure superiority in design. It is remarkable.
  • the movable piece is composed of the above bimetal
  • the elastic force of the movable piece is increased, the force generated during thermal deformation is also increased at the same time, so the above problems do not occur easily. Therefore, the above-mentioned problem is peculiar to the form in which the movable piece and the thermoresponsive element are composed of separate parts.
  • the present invention has been made to solve the above problems, and a main object of the present invention is to provide a thermal responsive element, a breaker, and the like that can easily realize miniaturization while maintaining electrical resistance when conducting.
  • thermoresponsive element of the present invention is a plate-shaped thermoresponsive element, and has a long side extending in the length direction in a plan view viewed from the thickness direction, and the length. It is formed in a rectangular shape having a short side extending in the width direction perpendicular to the vertical direction, and a widening portion for expanding the width dimension is provided in the central portion in the length direction, and the width toward the central portion. It is characterized in that the dimensions are gradually increasing.
  • thermoresponsive element it is preferable that the long side is enlarged in a barrel shape.
  • thermoresponsive element it is preferable that the corners where the long sides and the short sides intersect are rounded.
  • the breaker of the present invention has the thermal responsive element, a fixed contact, an elastic portion that elastically deforms, and a movable contact at the tip of the elastic portion, and presses the movable contact against the fixed contact.
  • a breaker comprising a movable piece and a first case having a recess for accommodating the movable piece and the heat responsive element, wherein the heat responsive element is deformed in accordance with a change in temperature to move the movable piece. It is possible to shift the state of the piece from a conductive state in which the movable contact contacts the fixed contact to a shut-off state in which the movable contact is separated from the fixed contact, and the first case is located outside the recess in the width direction. It has a side wall, and the thickness of the side wall is gradually reduced toward the central portion of the side wall in the longitudinal direction.
  • a second case that covers at least a part of the recess is further provided, the second case has a fixing surface that is fixed to an end surface of the side wall, and the fixing surface has the It is preferable that a projecting portion that projects toward the end surface and that is continuous along the length direction is provided, and that the projecting portion is formed outward of the inner side surface of the side wall in the width direction.
  • a cross-sectional area of the protrusion that is perpendicular to the length direction decreases toward the central portion of the side wall in the length direction.
  • the safety circuit for electric equipment of the present invention is characterized by including the breaker.
  • a secondary battery pack for electric equipment of the present invention is characterized by including the breaker.
  • the force generated by the thermoresponsive element during the thermal deformation depends on the thickness of the thermoresponsive element.
  • the inventor of the present application has noticed that it is difficult to obtain stable temperature characteristics in the thermal responsive element in which only the thickness dimension is increased.
  • the width dimension of the central portion in the length direction effectively acts to stabilize the temperature characteristics.
  • the widened portion for expanding the width dimension is provided in the central portion in the length direction, and the width dimension is gradually increased toward the central portion.
  • the width dimension of the thermoresponsive element is suppressed from the central portion toward the short side, the occupied area of the thermoresponsive element in a plan view is suppressed, and the miniaturization of the thermoresponsive element is easily realized.
  • the thermal responsive element since the thermal responsive element is provided, it is possible to easily reduce the electric resistance during conduction by adopting the movable piece that generates a large elastic force. Moreover, since the thickness of the side wall of the first case is gradually reduced toward the central portion in the length direction of the side wall, the breaker can be easily miniaturized together with the heat responsive element.
  • the perspective view before an assembly showing the schematic structure of the breaker by one embodiment of the present invention Sectional drawing which shows the said breaker in a normal charge or discharge state. Sectional drawing which shows the said breaker at the time of an overcharge state or an abnormality.
  • the top view which shows another modification of the said thermoresponsive element The perspective view which shows another modification of the said thermoresponsive element.
  • a breaker according to an embodiment of the present invention will be described with reference to the drawings.
  • 1 to 3 show the configuration of the breaker 1.
  • the breaker 1 is mounted on an electric device or the like and protects the electric device from an excessive temperature rise or an overcurrent.
  • the breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 having a movable contact 41 at a tip thereof, a thermal responsive element 5 that deforms with a temperature change, and a PTC (Positive Temperature Coefficient) thermistor 6.
  • the case 10 includes a case body (first case) 7, a lid member (second case) 8 mounted on the upper surface of the case body 7, and the like.
  • the fixing piece 2 is formed, for example, by pressing a metal plate containing copper as a main component (other than this, a metal plate of copper-titanium alloy, nickel silver, brass, etc.), and is insert-molded into the case body 7. It is embedded.
  • a terminal 22 that is electrically connected to an external circuit is formed at one end of the fixed piece 2, and a support portion 23 that supports the PTC thermistor 6 is formed at the other end side.
  • the PTC thermistor 6 is mounted on convex protrusions (doughs) 24 formed at three locations on the support portion 23 of the fixed piece 2 and supported by the protrusions 24.
  • the fixed contact 21 is formed at a position facing the movable contact 41 by clad, plating or coating of a material having good conductivity such as silver, nickel, nickel-silver alloy, copper-silver alloy, gold-silver alloy. It is exposed from a part of the opening 73a formed inside the case body 7.
  • the terminal 22 is projected outward from the edge of the case body 7.
  • the support portion 23 is exposed from an opening 73d formed inside the case body 7.
  • the surface on the side where the fixed contact 21 is formed (that is, the upper surface in FIG. 1) is the A surface, and the opposite surface is the B surface. is doing.
  • the direction from the fixed contact 21 to the movable contact 41 is defined as the first direction and the direction opposite to the first direction is defined as the second direction
  • the A surface faces the first direction
  • the B surface faces the second direction.
  • the movable piece 4 is formed into an arm shape symmetrical with respect to the center line in the longitudinal direction by pressing a plate-shaped metal material containing copper or the like as a main component.
  • a movable contact 41 is formed at the tip of the movable piece 4 in the longitudinal direction.
  • the movable contact 41 is formed of, for example, a material similar to that of the fixed contact 21, and is joined to the tip end of the movable piece 4 by a method such as welding, clad, crimping, or the like.
  • a terminal 42 electrically connected to an external circuit is formed at the other end of the movable piece 4 in the longitudinal direction.
  • the movable piece 4 has a contact portion 43 and an elastic portion 44 between the movable contact 41 and the terminal 42.
  • the contact portion 43 contacts the case body 7 and the lid member 8 between the terminal 42 and the elastic portion 44.
  • the contact portion 43 has a protruding portion 43a that protrudes like a wing in the lateral direction of the movable piece 4. Since the protrusion 43a is provided, the contact portion 43 is sandwiched between the case body 7 and the lid member 8 in a wide and large area, and the movable piece 4 is firmly fixed to the case 10.
  • the elastic portion 44 extends from the contact portion 43 to the movable contact 41 side.
  • the movable piece 4 is cantilevered by the case 10 at the abutment portion 43 on the proximal end side of the elastic portion 44, and is elastically deformed in this state to be formed at the tip portion of the elastic portion 44.
  • the movable contact 41 that is present is pressed against the side of the fixed contact 21 and comes into contact with it, and the fixed piece 2 and the movable piece 4 can be energized.
  • the movable piece 4 is curved or bent in the elastic portion 44 by press working.
  • the degree of bending or bending is not particularly limited as long as the thermoresponsive element 5 can be housed therein, and may be appropriately set in consideration of the elastic force at the reversing operation temperature and the normal return temperature, the pressing force of the contacts, and the like.
  • a pair of protrusions 44 a and 44 b is formed on the surface B of the elastic portion 44 so as to face the thermoresponsive element 5.
  • the protrusion 44a protrudes toward the heat responsive element 5 at the base end side and contacts the heat responsive element 5 in a blocked state.
  • the protrusion 44b protrudes toward the heat responsive element 5 on the tip side (that is, the movable contact 41 side) of the protrusion 44a, and contacts the heat responsive element 5 in a blocked state.
  • the thermal responsive element 5 is deformed by overheating, the thermal responsive element 5 contacts the protrusions 44a and 44b, the deformation of the thermal responsive element 5 is transmitted to the elastic portion 44 via the protrusions 44a and 44b, and the movable piece 4 moves.
  • the tip is pushed up (see Fig. 3).
  • the heat responsive element 5 shifts the state of the movable piece 4 from a conductive state in which the movable contact 41 contacts the fixed contact 21 to a cutoff state in which the movable contact 41 is separated from the fixed contact 21.
  • the heat responsive element 5 is formed in a plate shape by laminating thin plate materials having different thermal expansion coefficients, and has an initial shape in which a cross section is curved in an arc shape. When the operating temperature is reached due to overheating, the curved shape of the thermal responsive element 5 reversely warps with snap motion, and is restored when the temperature falls below the return temperature due to cooling.
  • the initial shape of the thermoresponsive element 5 can be formed by press working.
  • thermoresponsive element 5 are not particularly limited as long as the elastic portion 44 of the movable piece 4 is pushed up by the backward warping operation of the thermoresponsive element 5 at the desired temperature and returned to its original state by the elastic force of the elastic portion 44.
  • a rectangular shape is desirable from the viewpoint of productivity and efficiency of reverse warping operation.
  • thermoresponsive element 5 As the material of the heat-responsive element 5, two kinds of materials having different coefficients of thermal expansion, which are made of various alloys such as nickel silver, brass and stainless steel, are laminated and used in combination according to the required conditions.
  • a material of the thermoresponsive element 5 that can obtain a stable operation temperature and a stable return temperature it is desirable to combine a copper-nickel-manganese alloy on the high expansion side and an iron-nickel alloy on the low expansion side.
  • a material in which an iron-nickel-chromium alloy is combined on the high expansion side and an iron-nickel alloy is combined on the low expansion side can be mentioned.
  • there is a combination of an iron-nickel-chromium alloy on the high expansion side and an iron-nickel-cobalt alloy on the low expansion side there is a combination of an iron-nickel-chromium alloy on the high expansion side and an iron-nickel-cobalt alloy on the low expansion side.
  • the PTC thermistor 6 makes the fixed piece 2 and the movable piece 4 electrically conductive when the movable piece 4 is in the cutoff state.
  • the PTC thermistor 6 is arranged between the fixed piece 2 and the thermoresponsive element 5. That is, the support portion 23 of the fixed piece 2 is located immediately below the thermoresponsive element 5 with the PTC thermistor 6 interposed therebetween.
  • the type can be selected according to the needs of the operating current, the operating voltage, the operating temperature, the return temperature, etc.
  • the material and shape are not particularly limited as long as these characteristics are not impaired.
  • a ceramic sintered body containing barium titanate, strontium titanate or calcium titanate is used.
  • so-called polymer PTC in which conductive particles such as carbon are contained in polymer may be used.
  • the case body 7 and the lid member 8 constituting the case 10 are made of a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT) having excellent heat resistance. Has been done. A material other than the resin may be applied as long as the characteristics equal to or higher than those of the resin described above can be obtained.
  • a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT) having excellent heat resistance. Has been done.
  • a material other than the resin may be applied as long as the characteristics equal to or higher than those of the resin described above can be obtained.
  • the case main body 7 is formed with a recess 73 which is an internal space for housing the movable piece 4, the thermoresponsive element 5, the PTC thermistor 6, and the like.
  • the recess 73 has openings 73a and 73b for accommodating the movable piece 4, an opening 73c for accommodating the movable piece 4 and the thermoresponsive element 5, an opening 73d for accommodating the PTC thermistor 6, and the like. ing.
  • the edges of the movable piece 4 and the heat responsive element 5 incorporated in the case body 7 are respectively brought into contact with each other by the frame forming the recess 73 and guided when the heat responsive element 5 warps backward.
  • the lid member 8 is configured to cover the recess 73.
  • the lid member 8 may be configured to cover at least a part of the recess 73.
  • a metal plate containing copper or the like as a main component or a metal plate such as stainless steel may be embedded in the lid member 8 by insert molding. The metal plate appropriately contacts the surface A of the movable piece 4 to restrict the movement of the movable piece 4, and contributes to the downsizing of the breaker 1 while enhancing the rigidity and strength of the lid member 8 and thus the case 10 as a housing. To do.
  • the lid member 8 covers the case 73 so as to close the openings 73a, 73b, 73c and the like of the case body 7 that houses the fixed piece 2, the movable piece 4, the thermoresponsive element 5, the PTC thermistor 6 and the like. It is attached to the main body 7.
  • the case body 7 and the lid member 8 are joined by ultrasonic welding, for example.
  • FIG. 2 shows the operation of the breaker 1 in a normal charging or discharging state.
  • the thermoresponsive element 5 maintains the initial shape before reverse warpage.
  • the thermal responsive element 5 may be separated from the protrusions 44a and 44b of the movable piece 4 in the conductive state. As a result, the contact pressure between the movable contact 41 and the fixed contact 21 is increased, and the contact resistance between them is reduced.
  • FIG. 3 shows the operation of the breaker 1 in the overcharged state or the abnormal state.
  • the thermal responsive element 5 that has reached the operating temperature warps backward and contacts the elastic portion 44 of the movable piece 4, and the elastic portion 44 is pushed up to cause the fixed contact 21 and the movable contact 41 to contact each other. Are separated. At this time, the current flowing between the fixed contact 21 and the movable contact 41 is cut off.
  • the thermoresponsive element 5 comes into contact with the movable piece 4, and a slight leakage current flows through the thermoresponsive element 5 and the PTC thermistor 6.
  • the PTC thermistor 6 brings the fixed piece 2 and the movable piece 4 into conduction with each other via the thermal responsive element 5 that moves the movable piece 4 to the cutoff state.
  • the PTC thermistor 6 continues to generate heat as long as such a leakage current flows, and dramatically increases the resistance value while maintaining the thermoresponsive element 5 in the reverse warped state, so that the current passes through the path between the fixed contact 21 and the movable contact 41. Does not flow through and there is only the above-mentioned slight leakage current (constituting a self-holding circuit). This leakage current can be used for other functions of the safety device.
  • FIG. 4 is a plan view of the thermoresponsive element 5 viewed from its thickness direction.
  • the thermoresponsive element 5 is formed in a rectangular shape having a long side 51 extending in the length direction (longitudinal direction) D1 and a short side 52 extending in the width direction (shorter direction) D2 perpendicular to the length direction. ..
  • the elastic portion 44 of the movable piece 4 extends in the length direction D1 of the thermoresponsive element 5.
  • a widened portion 54 for widening the width dimension is provided in the central portion 53 of the heat responsive element 5 in the length direction D1.
  • the widened portion 54 is represented by a hatched region (hereinafter, the same applies to FIG. 5 and the like).
  • the force generated by the thermal response element 5 during thermal deformation depends on the thickness dimension of the thermal response element 5.
  • the thermal response element in which only the thickness dimension is increased it is stable. It may be difficult to obtain the desired temperature characteristics.
  • the inventors of the present application have found that the width dimension W1 of the central portion 53 effectively acts to stabilize the temperature characteristics particularly in the rectangular thermoresponsive element 5.
  • the width dimension W1 of the central portion 53 is the width dimension of the end edge portion in the length direction D1 (the length of the short side 52). It's bigger than W2. As a result, it is possible to increase the thickness dimension of the thermal responsive element 5 while stably securing excellent temperature characteristics, and it is possible to easily increase the force generated by the thermal responsive element 5 during the thermal deformation. Becomes
  • thermoresponsive element 5 of the present invention the width dimension gradually increases from the short side 52 toward the central portion 53, so that the stress distribution in the longitudinal direction D1 of the thermoresponsive element 5 is smoothed, and The temperature characteristic in the depth direction D1 is further stabilized.
  • the width dimension of the thermal response element 5 is suppressed from the central portion 53 of the thermal response element 5 toward the short side 52, the area occupied by the thermal response element 5 in a plan view is suppressed, and the thermal response element 5 is suppressed. Can be easily realized.
  • the central portion 53 of the thermal responsive element 5 is a region in which a large stress is generated when the thermal responsive element 5 is thermally deformed, and is, for example, W2 / 4 from the center of the thermal responsive element 5 in the length direction D1.
  • the areas are as follows:
  • the long side 51 of the thermoresponsive element 5 is enlarged and formed in a barrel shape.
  • the thermoresponsive element 5 has an arc-shaped contour 56 in which the central portion 53 is enlarged at the end edge in the width direction D2.
  • the “arc” is a concept including not only a part of the circumference of a perfect circle but also a part of the circumference of an ellipse.
  • FIG. 5 shows a thermoresponsive element 5A which is a modified example of the thermoresponsive element 5.
  • the thermal responsive element 5A differs from the thermal responsive element 5 in that the long side 51 is formed by a straight line, and the long side 51 is formed in a curved shape that is convex outward in the width direction D2.
  • the long side 51 is composed of a pair of straight lines inclined with respect to the length direction D1 and a straight line parallel to the length direction D1. A straight line parallel to the direction D1 may be omitted.
  • the heat responsive element 5A by providing the widened portion 54 in the central portion 53, it is possible to increase the thickness dimension of the heat responsive element 5A while stably securing excellent temperature characteristics. The same as the thermoresponsive element 5.
  • FIG. 6 shows a thermoresponsive element 5B which is another modification of the thermoresponsive element 5.
  • the thermal responsive element 5B differs from the thermal responsive element 5 in that the long side 51 is formed in a curved shape that is convex inward in the width direction D2. Also in the thermal responsive element 5B, by providing the widened portion 54 in the central portion 53, it is possible to increase the thickness dimension of the thermal responsive element 5B while stably securing excellent temperature characteristics. The same as the thermoresponsive element 5.
  • FIG. 7 shows a heat responsive element 5C which is another modification of the heat responsive element 5.
  • the thermal response element 5C is different from the thermal response element 5 in which the widened portion 54 is formed from the central portion 53 to the short side 52 in that the widened portion 54 is formed only in the central portion 53. Also in the heat responsive element 5C, by providing the widened portion 54 in the central portion 53, it is possible to increase the thickness dimension of the heat responsive element 5C while stably securing excellent temperature characteristics. The same as the thermoresponsive element 5.
  • FIG. 8 shows a heat responsive element 5D which is another modification of the heat responsive element 5.
  • the heat responsive element 5D is different from the heat responsive element 5 in that the corner 55 where the long side 51 and the short side 52 intersect is rounded.
  • the corner 55 may be rounded.
  • the corner portion 55 may be chamfered linearly.
  • any one of the heat responsive elements 5 to 5D is provided, by adopting the movable piece 4 that generates a large elastic force, the electrical resistance at the time of conduction is increased. Can be easily reduced.
  • FIG. 9 shows the case body 7 in which the fixing piece 2 is insert-molded.
  • the case body 7 has a side wall 76 outside the recess 73 in the width direction D2.
  • the side wall 76 extends along the length direction D1 of the thermoresponsive element 5.
  • the thickness T of the side wall 76 gradually decreases toward the central portion 77 of the side wall 76 in the length direction D1. As a result, it is possible to prevent the central portion 77 of the side wall 76 from being enlarged in the width direction D2 when the thermal actuator 5 is applied to the breaker 1, and the breaker 1 can be easily miniaturized.
  • the case body 71 has a fixing surface 75 that is fixed to the lid member 8.
  • the fixing surface 75 is formed so as to surround the periphery of the recess 73.
  • the end surface 78 of the side wall 76 is fixed to the lid member 8 and constitutes a part of the fixed surface 75.
  • FIG. 10 shows the B side of the lid member 8.
  • the lid member 8 has a fixing surface 81 that is fixed to the fixing surface 75 of the case body 7.
  • the fixing surface 81 is formed at least in a region facing the fixing surface 75.
  • the fixing surface 81 is fixed to the end surface 78 in the region 82 that faces the end surface 78 of the side wall 76.
  • the area 82 of the fixing surface 81 is provided with a protruding portion 83 that protrudes toward the end surface 78. In FIG. 10, a part of the protruding portion 83 is broken.
  • the top of the protruding portion 83 first comes into contact with the fixing surface 75 when the lid member 8 is attached to the case body 7.
  • the pressure acting on the top of the protrusion 83 during ultrasonic welding increases, and the frictional heat generated between the top of the protrusion 83 and the fixing surface 75 increases.
  • the resin of the protruding portion 83 is easily melted, and the fixing between the fixing surface 75 and the fixing surface 81 becomes good.
  • the protrusion 83 extends continuously along the side wall 76 in the length direction D1. As a result, the adhesion between the end surface 78 of the side wall 76 and the fixing surface 81 becomes good. Further, the protruding portion 83 is formed outward of the inner side surface 79 (see FIG. 9) of the side wall 76 in the width direction D2. As a result, the melted resin of the protruding portion 83 is prevented from entering the concave portion 73 and interfering with the thermoresponsive element 5.
  • the cross-sectional area S of the protrusion 83 perpendicular to the length direction D1 is preferably reduced toward the central portion 77 of the side wall 76 in the length direction D1.
  • the molten resin of the protruding portion 83 is further suppressed from entering the concave portion 73 as a flash and interfering with the thermoresponsive element 5. Further, the melted resin of the protruding portion 83 is suppressed from becoming a flash and protruding from the outer side surface of the case 10.
  • the inner edge of the protruding portion 83 is formed along the inner side surface 79 of the side wall 76, and the outer edge of the protruding portion 83 is formed parallel to the outer edge of the lid member 8.
  • the width dimension W3 of the protruding portion 83 decreases toward the central portion 77, and the above-described distribution of the cross-sectional area S is easily realized.
  • the breaker 1 of the present invention is not limited to the configuration of the above embodiment, and may be implemented in various modes. That is, the heat responsive element 5 and the like are formed at least in a plate shape and extend in the plan view viewed from the thickness direction in the long side 51 extending in the length direction D1 and in the width direction D2 perpendicular to the length direction D1.
  • the width dimension is gradually increased toward the central portion 53 by forming the rectangular portion having the short side 52 and the widening portion 54 for enlarging the width dimension in the central portion 53 in the length direction D1. Just do it.
  • the method of joining the case body 7 and the lid member 8 is not limited to ultrasonic welding, and any method can be appropriately applied as long as the method can firmly join the two.
  • a liquid or gel adhesive may be applied / filled and cured to bond the two.
  • the case 10 is not limited to the form formed by the case body 7, the lid member 8 and the like, and may be formed by two or more parts.
  • the present invention can also be applied to a mode in which a movable piece and a terminal piece are separately molded and electrically connected by welding or the like, for example, as disclosed in JP-A-2016-35822. ..
  • the present invention can also be applied to a form in which the terminals 22 and 42 are exposed from the B surface of the case body 7.
  • the lid member 8 may be provided with an opening.
  • the opening penetrates the lid member 8 in the thickness direction.
  • the present invention can be applied to a form in which the lid member 8 is omitted from the case 10, that is, a form in which the recess 73 of the case body 7 is opened and the movable piece 4 and the like are exposed.
  • the distance between the fixed contact 21 and the movable contact 41 when the movable piece 4 is in the cutoff state can be increased more easily.
  • the terminal piece is insert-molded in the case body 7, and the movable piece 4 is welded to the terminal piece at the base end side thereof, as disclosed in JP-A-2016-35822. May be fixed by.
  • the PTC thermistor 6 has a self-holding circuit, but it is also applicable to a form in which such a configuration is omitted.
  • FIG. 11 shows a secondary battery pack 500.
  • the secondary battery pack 500 includes a secondary battery 501 and a breaker 1 provided in the output circuit of the secondary battery 501.
  • FIG. 12 shows a safety circuit 502 for electrical equipment.
  • the safety circuit 502 includes the breaker 1 in series in the output circuit of the secondary battery 501. According to the secondary battery pack 500 or the safety circuit 502 provided with the breaker 1, it is possible to manufacture the secondary battery pack 500 or the safety circuit 502 that can easily realize downsizing while maintaining the electrical resistance when conducting.

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Abstract

Selon la présente invention, un élément actionné thermiquement en forme de plaque (5) se présente sous la forme d'un rectangle, dans une vue en plan vue dans la direction de l'épaisseur, ayant des côtés longs (51) s'étendant dans une direction longitudinale D1 et ayant des côtés courts (52) s'étendant dans une direction de largeur D2 perpendiculaire à la direction longitudinale D1. Une section large (54) à laquelle la dimension de largeur est élargie est disposée au niveau de la partie centrale (53) dans la direction longitudinale D1, et ainsi la dimension de largeur augmente progressivement vers la partie centrale (53).
PCT/JP2019/041654 2018-11-08 2019-10-24 Élément actionné thermiquement, disjoncteur, circuit de sécurité et bloc-batterie secondaire WO2020095694A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018210564A JP2020077541A (ja) 2018-11-08 2018-11-08 熱応動素子、ブレーカー、安全回路及び２次電池パック
JP2018-210564 2018-11-08

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WO2020095694A1 true WO2020095694A1 (fr) 2020-05-14

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WO (1) WO2020095694A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0315444U (fr) * 1989-06-28 1991-02-15
JP2011233314A (ja) * 2010-04-27 2011-11-17 Nec Schott Components Corp 温度保護素子
JP2016051594A (ja) * 2014-08-29 2016-04-11 株式会社小松ライト製作所 ブレーカー及びそれを備えた安全回路並びに２次電池回路。

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0315444U (fr) * 1989-06-28 1991-02-15
JP2011233314A (ja) * 2010-04-27 2011-11-17 Nec Schott Components Corp 温度保護素子
JP2016051594A (ja) * 2014-08-29 2016-04-11 株式会社小松ライト製作所 ブレーカー及びそれを備えた安全回路並びに２次電池回路。

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