WO2015156136A1 - Dispositif de protection - Google Patents

Dispositif de protection Download PDF

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Publication number
WO2015156136A1
WO2015156136A1 PCT/JP2015/059187 JP2015059187W WO2015156136A1 WO 2015156136 A1 WO2015156136 A1 WO 2015156136A1 JP 2015059187 W JP2015059187 W JP 2015059187W WO 2015156136 A1 WO2015156136 A1 WO 2015156136A1
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WO
WIPO (PCT)
Prior art keywords
terminal
arm
protective device
upper plate
resin base
Prior art date
Application number
PCT/JP2015/059187
Other languages
English (en)
Japanese (ja)
Inventor
博介 内野
新 田中
Original Assignee
タイコエレクトロニクスジャパン合同会社
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 タイコエレクトロニクスジャパン合同会社 filed Critical タイコエレクトロニクスジャパン合同会社
Priority to CN201580026564.5A priority Critical patent/CN106463303A/zh
Priority to JP2016512659A priority patent/JPWO2015156136A1/ja
Publication of WO2015156136A1 publication Critical patent/WO2015156136A1/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
    • H01H37/04—Bases; Housings; Mountings
    • 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 protective device having a bimetal element and a PTC (positive temperature coefficient) element.
  • Bimetal elements are used as means for interrupting current.
  • a bimetallic element has a sheet member made of bimetallic metal, and when the temperature of the bimetallic element itself exceeds a specific temperature or when the temperature of the surrounding atmosphere becomes high, the bimetallic element exceeds a specific temperature. When the temperature becomes high, it is configured to operate (i.e., to be deformed) and to interrupt a current flowing through the bimetal element.
  • bimetal element When such a bimetal element is incorporated in an electrical device, it will operate and cut off the current when the electrical device becomes abnormally hot due to overcurrent or other reasons. Although the temperature of the electric device decreases due to the interruption of the current, the temperature of the bimetal element itself also decreases, so that the bimetal element returns to its original shape (that is, returns), and as a result, the cause of the abnormality is removed and the electric device is removed. It may be possible to allow current to flow again before ensuring safety.
  • the bimetal element is arranged in series so that the current of the circuit can be cut off, and the PTC element is arranged in parallel to the bimetal element.
  • a protection device configured to arrange a movable contact that operates to open a circuit by the operation of a bimetal element in an electric circuit, and to arrange a PTC element in parallel to the bimetal element.
  • a PTC element, a bimetal element, and an arm are arranged in a space in a resin base, and a resin cover is arranged on the resin base. In this state, the resin base and the resin cover are integrated by ultrasonic melting.
  • a protective device is disclosed which is adhered to the housing.
  • Patent Document 2 the first terminal, the PTC element, the bimetal element, the arm, and the upper plate are arranged in the space in the resin base, and the resin cover is subjected to secondary molding (for example, insert formation) in this state.
  • secondary molding for example, insert formation
  • the conventional protection device as described above requires a process of installing a resin cover after placing each element in the space in the resin base, for example, a process of installing by ultrasonic welding or a secondary mold, It was complicated.
  • the presence of the resin cover is disadvantageous in increasing the internal space of the protective device or reducing the size, particularly the thickness, of the protective device.
  • an object of the present invention is to provide a protective device that has a large internal space, can be reduced in size and thickness, and can be easily manufactured.
  • the present inventors have eliminated the necessity of the resin cover by holding the upper plate on the inner wall of the resin base, preferably the upper edge thereof, and the resin base. It has been found that the internal space of can be increased or the size of the protective device can be reduced.
  • a protective device comprising a resin base, a first terminal, a PTC element, a bimetal element, an arm, an upper plate and a second terminal
  • the first terminal, the PTC element, the bimetal element and the arm are stacked in this order, and the internal space including these is sealed by the upper plate,
  • the upper plate is held by the inner wall of the resin base,
  • the first terminal, the arm and the second terminal are electrically connected in series in this order;
  • the bimetal element is activated, the first terminal and the arm are electrically disconnected, while the first terminal, the PTC element, the bimetal element, the arm and the second terminal are electrically connected in this order.
  • a protection device is provided that is configured to be connected to the.
  • an electric device comprising the above-described protective device.
  • the resin cover is used by holding the upper plate on the inner wall of the resin base.
  • a protection device can be configured. Since the protective device of the present invention does not require a resin cover, the thickness of the protective device can be reduced. Further, by holding the upper plate on the inner wall of the resin base, the upper plate does not require a portion (for example, a leg portion, a hook, etc.) for fixing itself to the resin base. It becomes possible to make it wider.
  • FIG. 1 schematically shows a plan view of a protective device 1 according to one embodiment of the present invention.
  • FIG. 2 schematically shows a cross-sectional view perpendicular to the top surface of the protection device of FIG. 1 and including a straight line xx.
  • FIG. 3 schematically shows an exploded perspective view obtained when the protection device of FIG. 1 is temporarily disassembled into elements constituting the protection device.
  • FIG. 4 is a view for explaining a method of fixing the upper plate to the resin base by heat caulking.
  • FIG. 5 schematically shows a plan view of a protective device 1 ′ according to another aspect of the present invention.
  • FIG. 6 schematically shows a cross-sectional view perpendicular to the top surface of the protection device of FIG. 5 and including a straight line xx.
  • FIG. 7 schematically shows an exploded perspective view obtained when the protection device of FIG. 5 is temporarily disassembled into elements constituting the protection device.
  • FIG. 8 schematically shows a plan view of a protective device 1 ′′ according to another aspect of the present invention.
  • FIG. 9 schematically shows a cross-sectional view perpendicular to the top surface of the protection device of FIG. 8 and including a straight line xx.
  • FIG. 10 schematically shows an exploded perspective view obtained when the protection device of FIG. 9 is temporarily disassembled into elements constituting the protection device.
  • FIG. 11 schematically shows a cross-sectional view of a protection device 11 according to another aspect of the present invention.
  • FIG. 12 schematically shows a cross-sectional view of a protective device 11 ′ according to another aspect of the present invention.
  • FIG. 3 schematically shows a state in which the protection device of the present invention shown in FIGS. 1 and 2 is disassembled for each element constituting the protection device.
  • FIG. 3 shows the present invention in a completed state as the device.
  • FIG. 2 schematically shows an exploded perspective view obtained when the protective device 1 is temporarily disassembled into its constituent elements.
  • the protection device 1 of the present invention has a structure schematically shown in FIGS. Specifically, the protection device 1 includes a resin base 6 having a first terminal 2 and a second terminal 4, a PTC element 8, a bimetal element 10, an arm 12, and an upper plate 14.
  • the resin base 6 has a space 16, a part of the first terminal 2 is exposed at the bottom, the PTC element 8 is disposed above the exposed portion 18, and the bimetal element 10 is disposed above the PTC element 8.
  • An arm 12 is disposed above.
  • the arm 12 is fixed to the second terminal 4 by caulking.
  • the upper plate 14 is held by the inner wall 24 of the resin base 6, thereby sealing the space 16 of the resin base 6.
  • the first terminal 2, the arm 12, and the second terminal 4 are electrically connected in series during normal times when no overcurrent or abnormal heat generation occurs. Further, the bimetal element 10 is curved so as to protrude upward (arm side) as shown in the figure, and is separated from the arm 12. In this state, the current flows in the order of the first terminal 2, the first terminal contact portion 26, the arm contact portion 28, the arm 12, and the second terminal 4 (or vice versa), and the PTC element 8 and the bimetal element 10. There is no current flowing through. When an abnormality occurs, that is, when an overcurrent occurs or abnormal heat generation occurs, the bimetal element 10 operates and protrudes upward (upward in FIG. 2) to downward (downward in FIG. 2).
  • the arm 12 is lifted upward, and the electrical connection between the contact portion 28 of the arm and the contact portion 26 of the first terminal is interrupted. Further, the deformed bimetal element 10 comes into contact with the PTC element 8 and the arm 12 and is electrically connected thereto. In this state, current flows in the order of the first terminal 2, the PTC element 8, the bimetal element 10, the arm 12, and the second terminal 4 (or vice versa), and the PTC element 8 trips due to Joule heat generated by this current ( Operation) and Joule heat continues to be generated.
  • the bimetallic element 10 is held in a downwardly convex state by the Joule heat, and the contact state between the arm 12 and the first terminal 2 can be maintained. At this time, the circuit to be protected is substantially cut off from current (however, a minute current as a leakage current can flow).
  • the first terminal 2, the second terminal 4, and the resin base 6 are integrally formed by insert molding. By performing the insert molding in this manner, the adhesion between the first terminal 2 and the second terminal 4 and the resin base 6 can be enhanced.
  • the resin base 6 has a space 16, and a portion 18 (hereinafter referred to as an exposed portion 18) of the first terminal 2 is exposed at the bottom thereof.
  • the PTC element 8 is disposed on the exposed portion 18 of the first terminal.
  • the first terminal 2 may have a plurality of, for example, three, for example, three dome-shaped contacts 30 on the exposed portion 18 so as to easily ensure electrical connection with the PTC element 8 (see FIG. 3). ). In FIG.
  • the first terminal 2 is not exposed from the bottom surface of the resin base, but the resin base is thinned so that a part of the first terminal 2 (for example, the back side of the exposed portion 18) is exposed from the bottom surface of the resin base. It may be exposed.
  • the thickness of the protective device can be reduced, and heat generated inside the protective device such as the contact between the first terminal and the arm can be efficiently dissipated to the outside. And the holding current can be further improved.
  • the material constituting the first terminal 2 and the second terminal 4 is not particularly limited as long as it is a conductive material, but a conductive metal is preferable. As such a material, the same material as the conventional one can be used.
  • first terminal portion 20 and the second terminal portion 22 extend outward through the side surface of the resin base 6.
  • the first terminal portion 20 and the second terminal portion 22 are portions for electrically connecting the protection device 1 of the present invention to a predetermined electric element, and fulfill the original function of the terminal.
  • a contact 32 may be provided on a part 20 of the first terminal and a part 22 of the second terminal.
  • the first terminal 2 has a contact portion 26 with the contact portion 28 of the arm 12.
  • the contact portion 26 can be formed by various methods.
  • the contact portion 26 can be formed by installing a contact material on the first terminal 2 by caulking, plating, or welding.
  • the contact portion 26 may be an inlay material or a clad material.
  • the contact portion 26 is formed by caulking a contact material in a hole provided through the corresponding position of the first terminal 2.
  • the contact portion is inserted into a hole provided through the first terminal with a contact material having a diameter equivalent to the diameter of the hole and a thickness (or height) larger than the thickness of the hole.
  • the contact material is caulked and fixed to the first terminal by crushing the portion protruding vertically from the hole.
  • the contact material does not necessarily have a cylindrical shape, and may have a prismatic shape or the like.
  • the metal constituting the contact material is not particularly limited, but preferably has a large heat capacity, such as silver-nickel, silver-copper, AgCdO, AgSnO 2 , AgZnO, AgSnOInO, AgCu, copper-tungsten alloy, and the like.
  • a 90% silver 10% nickel alloy is preferred from the viewpoints of low hardness, fine design of the shape of the contact portion, particularly thickness, and large heat capacity.
  • At least a portion of the first terminal 2 and / or the second terminal 4 that is connected to another element may be plated with a metal that is difficult to oxidize.
  • the first terminal 2 and / or the portion connecting the second terminal 4 and other electrical elements for example, the contact 32
  • the contact portion, the contact portion between the second terminal 4 and the arm 12 is preferably plated with a metal that is not easily oxidized.
  • Examples of the metal that is difficult to oxidize include, but are not limited to, gold, platinum, silver, mercury, copper, and the like.
  • the resin base 6 is formed of a heat resistant resin, preferably a resin that is stable under the temperature environment of the reflow furnace.
  • a resin that is stable under the temperature environment of the reflow furnace.
  • heat resistant resin examples include LCP (Liquid Crystal Polymer) resin, polyamide resin, PPS (Poly Phenylene Sulfide) resin, and the like.
  • the PTC element 8 is disposed above the exposed portion 18 of the first terminal.
  • the first terminal 2 and the PTC element 8 are electrically connected through, for example, the contact 30.
  • the PTC element either a ceramic PTC element or a polymer PTC element may be used, but a polymer PTC element is preferably used.
  • the polymer PTC element is advantageous in that the resistance value of the element itself is lower than that of the ceramic PTC element and self-destruction is unlikely to occur even when the temperature exceeds a certain level.
  • the polymer PTC element has a lower voltage required to maintain the trip state than the ceramic PTC element, and can maintain the trip state even when the circuit voltage is low.
  • the contact can be maintained in an open state (latched state) and chattering phenomenon that repeatedly opens and closes the contact can be prevented.
  • the polymer PTC element is preferable in that it is smaller and has a lower resistance than the ceramic PTC element.
  • the polymer PTC element extrudes a conductive composition
  • a conductive composition comprising a polymer (eg, polyethylene, polyvinylidene fluoride, etc.) in which a conductive filler (eg, carbon black, nickel alloy, etc.) is dispersed. It has the layered PTC element obtained by this, and the electrode (for example, metal foil) arrange
  • a polymer eg, polyethylene, polyvinylidene fluoride, etc.
  • a conductive filler eg, carbon black, nickel alloy, etc.
  • the resistance value is preferably 0.8 to 15 ⁇ , and more preferably 4.5 to 15 ⁇ .
  • the state of tripping at 3 V can be maintained by setting the resistance value of the polymer PTC element to 0.8 ⁇ or more.
  • the resistance value of the polymer PTC element is set to 4.5 ⁇ or more, it becomes possible to set the leakage current in a trip state at 3 V to 0.2 A or less.
  • the resistance value of the polymer PTC element to 15 ⁇ or less, it becomes easy to reduce the variation of the resistance value in the production.
  • the resistance value of the polymer PTC element is a polymer PTC obtained by pressure-bonding electrodes (preferably nickel foil) to both sides of a PTC element obtained by extruding a conductive composition containing a polymer.
  • a bimetal element 10 is disposed above the PTC element 8.
  • the bimetal element 10 is supported by a step 34 provided in the space 16 or a shoulder of the PTC element 8.
  • it is supported by the shoulder portion of the PTC element and is separated from the step portion 34.
  • the bimetal element has a large curvature and its height (the edge of the bimetal element).
  • the stepped portion 34 may have a convex portion along the edge of the stepped portion as shown in the drawing.
  • the bimetal element 10 is not particularly limited as long as it is deformed when a temperature that should be determined as an abnormal state is reached or when a current that should be determined as an abnormal state flows. it can. In normal times, the bimetal element 10 may or may not be electrically connected to the PTC element 8, but is electrically connected in the event of an abnormality.
  • the bimetal element 10 is preferably as large as possible, that is, having a large surface area on the main surface, as long as the resin-based space 16 allows. By increasing the surface area, it is possible to reduce the variation in the operating temperature, and the force to lift the arm 12 upward when deformed during an abnormality is increased.
  • bimetal element 10 there is one bimetal element 10, but two or more may be used.
  • a plurality of bimetal elements By using a plurality of bimetal elements, the force that lifts the arm 12 upward when deformed during an abnormality is increased.
  • two or more bimetal elements they may be the same bimetal element or different bimetal elements.
  • those having different operating temperatures are used, for example, those having an upper bimetal element having an operating temperature higher than that of the lower bimetal element; those having a different thickness and / or size; The curvature of the contact surface between the elements is used in combination; or other than the lowermost bimetal element, one having no central protrusion may be used. In this way, by combining various bimetal elements, it is possible to adjust the lifting force of the arm when the bimetal element is deformed downwardly convex.
  • the bimetal element 10 may have a protrusion, for example, a dome-shaped convex part, in the vicinity of the center part of the lower surface (PTC element side).
  • the protrusion comes into contact with the PTC element 8 when the bimetal element 10 is activated and protrudes upward from the upwardly convex state. Since the arm 12 is further pushed upward by an amount corresponding to the height of the protrusion, the arm 12 can be sufficiently pushed up even when the degree of curvature of the bimetal element 10 itself is smaller.
  • the electrical connection at the contact of one terminal can be more reliably interrupted.
  • the arm 12 is disposed above the bimetal element 10 and is electrically connected to the second terminal 4 at the end opposite to the contact portion 28.
  • the connection method between the arm 12 and the second terminal 4 is not particularly limited, and examples thereof include caulking, soldering, and welding, but are preferably connected by caulking.
  • the material constituting the arm 12 is not particularly limited as long as it is a conductive material, but a conductive metal is preferable. As such a material, the same material as the conventional one can be used.
  • the arm 12 has a contact portion 28 and is curved so that the contact portion 28 is positioned slightly below the horizontal direction (extending direction of the bottom surface of the resin base) as shown in the figure. It is preferable that it is formed.
  • the contact portion 28 is normally in contact with the contact portion 26 of the first terminal. When the abnormality occurs, the arm 12 is lifted upward by the deformation of the bimetal 10 and the contact state is released.
  • the contact portion 28 is formed by various methods in the same manner as the contact portion 26 of the first terminal, but can be formed by caulking a contact material in a hole provided at a corresponding position of the arm 12. preferable. By forming such a contact portion on the arm 12, it becomes possible to give the contact portion a large heat capacity, so that even when a relatively large current flows through the protective device, the temperature of the contact portion increases rapidly. Can be prevented, and the holding current of the protective device can be increased. Note that either one of the contact portion 26 of the first terminal and the contact portion 28 of the arm 12 may be formed by caulking the contact material, but more preferably, both contact portions caulk the contact material. Is formed. By forming both contact portions by caulking the contact material, the holding current can be further increased.
  • the metal constituting the contact material may be the same as that constituting the contact material forming the contact portion 28 of the first terminal.
  • the arm 12 has a contact 36 at a position where the arm 12 contacts when the bimetal element is deformed downward in order to make the electrical connection between the arm and the bimetal element more reliable when the bimetal element is deformed at the time of abnormality. You may have.
  • the arm 12 has a concave shape on the upper plate side in the space 10 as shown in the figure. That is, as shown in FIG. 2, a portion of the arm 12 positioned above the bimetal element has a shape bent toward the upper plate. By setting it as such a shape, the distance with the bimetal element 10 can be taken normally, and an insulation state can be ensured more reliably.
  • the material constituting the arm 12 is not particularly limited as long as it is a conductive material, but is preferably a copper alloy containing phosphor bronze, beryllium copper, or the like, Ni, or a surface treatment (gold / silver / Ni) thereof. Is mentioned.
  • the arm 12 is preferably as wide as possible.
  • the width of the arm By increasing the width of the arm, the contact pressure between the contact portion 26 of the first terminal and the contact portion 28 of the arm can be increased, and instantaneous interruption due to impact, vibration, or the like can be suppressed.
  • an upper plate 14 is disposed above the arm 12 in the space 16.
  • the upper plate 14 is held by the inner wall 24 of the resin base 6, preferably the upper edge of the inner wall 24.
  • the material constituting the upper plate is not particularly limited, and for example, metal, resin, or the like can be used. It is preferable to use a metal material because heat can be efficiently transferred to the inside of the protective device when abnormal heat is generated outside.
  • a metal material nickel, stainless steel, iron, copper, aluminum, tin, titanium, or an alloy of these metals can be preferably used.
  • the upper plate may preferably be substantially planar.
  • the substantially planar shape means that there are no claws, hooks, legs, etc. for fixing to other members, and does not mean that the plate is completely flat.
  • a step may be provided at a portion held by the inner wall, for example, the peripheral end of the upper plate.
  • the method for holding the upper plate 14 on the resin-based inner wall 24 is not particularly limited, and examples thereof include caulking and welding.
  • the upper plate may be fixed and held on the inner wall using an adhesive.
  • the above retention is achieved by caulking the upper plate 14 to the inner wall 24.
  • the caulking method is not particularly limited, but heat caulking is preferably used.
  • heat caulking is performed by forming a shoulder 38 on the inner wall 24, placing the upper plate 14 thereon, and pressing the heated press 40 in the direction of the arrow to This can be done by bending inward while softening the tip.
  • the upper plate may be held by at least the opposed inner wall of the resin base, but is preferably held by the entire inner wall of the resin base.
  • the protective device can be reduced or the internal space can be increased by the thickness of the resin cover.
  • the protective device is made smaller by the amount of such claws, hooks, legs and corresponding members as compared with the method of installing and holding fixing claws, hooks, legs, etc. on the upper plate.
  • the force for lifting the arm can be increased and the arm having a high contact pressure between the arm and the first terminal can be used, instantaneous interruption due to vibration or the like can be suppressed.
  • the upper plate 14 held by the inner wall of the resin base can be exposed from the top of the protective device.
  • heat can be efficiently transferred to the inside of the protective device when abnormal heat generation occurs outside. Therefore, the protection device of the present invention can quickly sense abnormal heat and operate the bimetal element 10 to cut off the current. Further, in normal times, the heat generated inside the protective device, particularly at the contact point, can be efficiently dissipated to the outside of the device, thereby increasing the holding current.
  • the exposed surface of the upper plate 14 is plated with a metal that is difficult to oxidize.
  • a metal that is difficult to oxidize By plating with such a metal, it is possible to prevent the exposed surface from being oxidized when the protective device is heat-treated in a reflow furnace.
  • Examples of the metal that is difficult to oxidize include, but are not limited to, gold, platinum, silver, copper, and the like, and gold is particularly preferable.
  • the protective device of the present invention does not require a resin cover that covers the upper plate, it can be miniaturized.
  • the thickness thereof is, for example, 1.5 mm or less, more preferably 1.0 mm or less, and even more preferably 0.
  • the size can be 9.9 mm or less, and more preferably 0.7 mm or less.
  • the protection device of the present invention may have a width of 2.0 to 4.5 mm and a length of 4.5 to 15.0 mm.
  • the protective device of the present invention does not require a resin cover, when subjected to reflow processing, the resin cover is deformed by heat, and the possibility of adversely affecting each element existing in the internal space is reduced. it can. Furthermore, the size of the protective device, particularly the thickness can be reduced. Further, in the production of the protective device, the step of molding a resin cover that requires an optimal resin flow to a minute portion can be omitted, which is advantageous in terms of technology and cost.
  • the protective device of the present invention may be covered and protected with an insulating resin or the like, except for a part of the first terminal and the second terminal that are connected to other electric elements. .
  • the protection device of the present invention can be variously modified.
  • a protection device 1 ′ having a structure as shown in FIGS. 5 to 7 is provided.
  • the protective device 1 ′ is characterized in that a part of the first terminal 2 and the second terminal 4 are present on the same plane below the resin base 6, and the other configurations are described above. It is the same. That is, it corresponds to a part in which the first terminal part 20 and the second terminal part 22 of the protection device 1 are bent below the resin base.
  • Such a configuration facilitates surface mounting of the protection device of the present invention.
  • a protective device 1 ′′ having a structure as shown in FIGS. 8 to 10 is provided.
  • the upper plate functions as a second terminal. That is, as shown in FIGS. 8 to 10, the protective device 1 ′′ of the present invention has a resin base having the first terminal 2 and a fixing member 42. 6, PTC element 8, bimetal element 10, arm 12, and upper plate 14.
  • the resin base 6 has a space 16, a part of the first terminal 2 is exposed at the bottom, the PTC element 8 is disposed above the exposed portion 18, and the bimetal element 10 is disposed above the PTC element 8.
  • An arm 12 is disposed above. The arm 12 is fixed to the upper plate 14 by caulking.
  • the upper plate 14 is held by the inner wall 24 of the resin base 6, thereby sealing the space 16 of the resin base 6.
  • the first terminal 2, the arm 12, and the upper plate 14 functioning as the second terminal are electrically connected in series.
  • the arm 12 and the fixing member 42 are In this state, the current flows in the order of the first terminal 2, the arm 12, and the upper plate 14 (or vice versa), and the current flows in the PTC element 8 and the bimetal element 10.
  • the bimetal element 10 operates to lift the arm 12 upward, and the electrical connection between the arm 12 and the first terminal is interrupted, and the deformed bimetal element 10 includes the PTC element 8 and the arm. 12 is in a state of being electrically connected to these, in this state, the current is supplied to the first terminal 2, the PTC element 8, and the bar.
  • the metal element 10, the arm 12 and the upper plate 14 flow in the order (or vice versa), and the Joule heat generated by this current causes the PTC element 8 to trip (operate), thereby substantially cutting off the current to the circuit to be protected. Is done.
  • the upper plate is formed from a conductive material, and preferably can be welded directly to the upper plate, so that a conductive metal material, specifically nickel, stainless steel, iron, copper, aluminum, tin, titanium. Or an alloy of these metals.
  • connection direction of the leads or other electrical elements is not limited. Further, since the area of the exposed surface can be increased, the connection process is facilitated, and in particular, connection to a plurality of leads or other electrical elements is facilitated.
  • the upper plate 14 has a thickness that is preferably greater than 0.1 mm, and more preferably greater than or equal to 0.2 mm, particularly in the exposed portion. Resistance to welding loads when welding leads or other electrical elements directly to the exposed portion can be increased, that is, it is possible to weld leads or other electrical elements directly to the exposed portion of the upper plate.
  • the thickness of the upper plate 14 is not particularly limited, but is, for example, 1.0 mm or less, preferably 0.5 mm or less, and the protective device can be further downsized by setting the thickness of the upper plate to 1.0 mm or less. It becomes possible
  • the protective device 1 ′′ includes the fixing member 42.
  • the present invention is not limited to this aspect, and the fixing member may not exist.
  • the position of the fixing member is illustrated.
  • the fixing member may be installed at any place where it can be installed, and there may be a plurality of, for example, two, three, four or more fixing members. For example, in order to support the protective device when the protective device is installed on the substrate, or to install the protective device more reliably and more stably on the substrate. Installed for.
  • the protective device 1 ′′ can be surface-mounted because a part of the first terminal 2 and a part of the fixing member 42 exist on the same plane below the resin base. However, the first terminal 2 and the fixing member 42 may extend straight from the side surface of the protection device as in the protection device 1 described above.
  • a protection device 11 having a structure as shown in FIG. 11 is provided.
  • the protective device 11 has substantially the same configuration as the protective device 1 ′′ described above, except that the first terminal and a part of the fixing member do not go below the resin base.
  • a resin base 6 having a first terminal 2 and a fixing member 42, a PTC element 8, a bimetal element 10, an arm 12, and an upper plate 14.
  • the resin base 6 has a space 16, and the upper plate 14 is a second plate. Functions as terminal 4.
  • a protection device 11 ' having a structure as shown in FIG. 12 is provided.
  • the protective device 11 ′ has the same configuration as the protective device 11 except that a part of the first terminal is exposed from the bottom of the resin base. That is, the protection device 11 includes the resin base 6 having the first terminal 2 and the fixing member 42, the PTC element 8, the bimetal element 10, the arm 12, and the upper plate 14.
  • the resin base 6 has a space 16, the upper plate 14 functions as the second terminal 4, and a part of the first terminal 2 is exposed at the bottom of the resin base 6.
  • the protection device of the present invention can be suitably used as a protection device for lithium ion battery cells such as mobile phones and tablet devices.

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  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Thermistors And Varistors (AREA)

Abstract

La présente invention porte sur un dispositif de protection comprenant une base en résine, une première borne, un élément à Coefficient de Température Positif (PTC), un élément bimétallique, un bras, une plaque supérieure et une seconde borne, le dispositif de protection étant caractérisé par le fait que : la première borne, l'élément PTC, l'élément bimétallique et le bras sont empilés dans cet ordre à l'intérieur d'un espace interne défini par les parois internes de la base en résine, et l'espace interne contenant ces derniers est scellé de manière étanche par la plaque supérieure ; la plaque supérieure est maintenue par les parois internes de la base en résine ; la première borne, le bras et la seconde borne établissent une connexion électrique en série dans cet ordre ; et lorsque l'élément bimétallique est actionné, la première borne et le bras deviennent électriquement coupés tandis que la première borne, l'élément PTC, l'élément bimétallique, le bras et la seconde borne établissent une connexion électrique en série dans cet ordre. Ce dispositif de protection a un grand espace interne, peut être réduit en taille, et peut être fabriqué facilement.
PCT/JP2015/059187 2014-04-09 2015-03-25 Dispositif de protection WO2015156136A1 (fr)

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CN201580026564.5A CN106463303A (zh) 2014-04-09 2015-03-25 保护装置
JP2016512659A JPWO2015156136A1 (ja) 2014-04-09 2015-03-25 保護装置

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JP2014-080367 2014-04-09

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JP (1) JPWO2015156136A1 (fr)
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Publication number Priority date Publication date Assignee Title
WO2018209595A1 (fr) * 2017-05-17 2018-11-22 Littelfuse Electronics (Shanghai) Co., Ltd. Dispositif à coefficient de température positif

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005108585A (ja) * 2003-09-30 2005-04-21 Alps Electric Co Ltd 熱応動スイッチ
JP2011134624A (ja) * 2009-12-25 2011-07-07 Ii P I:Kk バイメタル式サーキットブレーカー
WO2012063869A1 (fr) * 2010-11-10 2012-05-18 タイコエレクトロニクスジャパン合同会社 Structure de contact
JP3185917U (ja) * 2013-04-19 2013-09-12 タイコエレクトロニクスジャパン合同会社 保護装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112008003632B4 (de) * 2008-01-28 2023-04-06 Uchiya Thermostat Co., Ltd. Hitzeschutz
CN103578850B (zh) * 2013-11-08 2015-11-18 南京海川电子有限公司 多功能电机保护器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005108585A (ja) * 2003-09-30 2005-04-21 Alps Electric Co Ltd 熱応動スイッチ
JP2011134624A (ja) * 2009-12-25 2011-07-07 Ii P I:Kk バイメタル式サーキットブレーカー
WO2012063869A1 (fr) * 2010-11-10 2012-05-18 タイコエレクトロニクスジャパン合同会社 Structure de contact
JP3185917U (ja) * 2013-04-19 2013-09-12 タイコエレクトロニクスジャパン合同会社 保護装置

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JPWO2015156136A1 (ja) 2017-04-13
CN106463303A (zh) 2017-02-22
TW201541488A (zh) 2015-11-01

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