JP2006196189A - Thermo-protector, manufacturing and mounting method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely manufacture a thermo-protector of a case type, operated by releasing elastic strain energy of an elastic body held by joining and fixing by a fusible material, by the fusion of the fusible material, safely by eliminating thermal effect when casing. <P>SOLUTION: One end of a linear or plate-shaped elastic body 3 is fixed to one conductor 2 of a pair of conductors 2 and 20 arranged with a predetermined vertical space in a housing 1 by a fusible material 4, the other end of the elastic body 3 is pushed in the longitudinal direction by a pressing piece 5 to elastically bend and deform elastic body 2, and the bent elastic body is contacted with the other conductor 20 to form a contact. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thermoprotector having a melting point or a softening point of a soluble material as an operating temperature, a manufacturing method thereof, and an attaching method.

Accumulated elastic strain energy as a thermo protector that detects abnormal heat generation in electronic and electrical devices, cuts off the device from the power supply by cut-off operation based on this detection, prevents overheating of the device, and prevents the occurrence of fire. In addition, a method of releasing elastic strain energy by melting or softening a soluble material is known.
For example, as shown in FIG. 8 (a), the elastic metal piece 2 ′ is forcibly bent, and both ends of the bent elastic metal piece 1 ′ are subjected to a bending reaction force to be fixed to the pair of fixed terminals 41 ′ and 42 ′. When a melting alloy (solder) 3 ′ having a melting point is joined and the ambient temperature is raised to the melting point of the soluble alloy 2 ′ to melt the soluble alloy, as shown in FIG. There is known a technique in which the bending stress of the piece 2 ′ is released and the connection between one end of the elastic metal piece 2 ′ and one fixed terminal 42 ′ is released to cut off the current supply (see Patent Document 1).
The thermo protector also requires mechanical protection like a normal electronic component, and is usually protected by a casing.
When casing electronic components, it is known that the casing is divided, the electronic component main body is surrounded by the divided casing, and the parting surface of this casing is fused by ultrasonic welding or bonded with an adhesive. Yes.

JP 7-29481 A

However, in the above-described thermoprotector that retains the elastic strain energy of the elastic body with a fusible alloy, when the parting surface of the divided casing is fused by ultrasonic welding or the like, the fusible alloy is heated by the heat at the time of fusing. There is a concern that the elastic strain energy may not be maintained due to softening, resulting in a defective product.
If the parting surface of the split casing is bonded with an adhesive, there is no such concern, but when the casing type thermo protector is mounted by flow method or reflow method soldering, the temperature of the thermo protector is much higher than the solder melting point. Since it is heated for a considerably long time, the fusible alloy is softened during mounting, and the elastic strain energy cannot be maintained and may be damaged.

  The object of the present invention is to eliminate the thermal effect of the case type thermo protector that is operated by releasing the elastic strain energy of the elastic body held by joining and fixing with the soluble material by melting the soluble material. Therefore, it is possible to manufacture safely, and to eliminate the thermal influence during mounting soldering and to enable safe mounting.

  In the thermo protector according to claim 1, a member constituting the contact and a linear or plate-like elastic body for opening and closing the contact are accommodated in the housing, and one end of the elastic body is fixed by a soluble material, The other end of the elastic body is pressed in the longitudinal direction by a holding piece inserted and fixed from the insertion hole of the housing, and the elastic body is elastically bent and deformed, so that the contact is held in the on state. The contact point is turned off by releasing the elastic strain energy of the elastic body by melting or softening the molten material.

  The thermo-protector according to claim 2 is the thermo-protector according to claim 1, wherein one end of a linear or plate-like elastic body is attached to one conductor of a pair of conductors arranged at predetermined vertical intervals in the housing. The elastic body is fixed by a fusible material, the other end of the elastic body is pressed in the longitudinal direction by a pressing piece, the elastic body is elastically bent and deformed, and the bending elastic body is brought into contact with the other conductor to form a contact point. It is characterized by that.

  The thermo protector according to claim 3 is characterized in that, in the thermo protector according to claim 1 or 2, the holding piece is provided with a retaining protrusion that is locked to the insertion hole in the pulling direction.

  The thermo protector according to claim 4 is the thermo protector according to claim 2 or 3, wherein one end of the linear or plate-like elastic body is fixed to one conductor by a soluble material by surface bonding. And

  The thermo protector according to claim 5 is the thermo protector according to claim 2 or 3, wherein one end portion of the linear or plate-like elastic body is folded, and the folded end portion is surface-bonded to one conductor by a soluble material. It is characterized by that.

  The thermo protector according to claim 6 is the thermo protector according to any one of claims 2 to 5, wherein the elastic body is any one of a metal, a polymer of a metal and a resin, or a composite.

  The thermo protector according to claim 7 is the thermo protector according to any one of claims 2 to 6, wherein the soluble material is a low melting point metal or a thermoplastic resin.

  The thermo protector according to claim 8 is the thermo protector according to any one of claims 1 to 7, wherein the contact is surrounded by a protective material.

  The thermo protector according to claim 9 is the thermo protector according to claim 1, wherein the soluble material is a low melting point metal or a thermoplastic resin, and the elastic body is any of a metal, a polymer or a composite of a metal and a resin, or a resin. It is characterized by.

  A manufacturing method of the thermo protector according to claim 10 is a method of manufacturing the thermo protector according to any one of claims 1 to 9, wherein a member constituting the contact and one end portion are fixed by a soluble material, or a linear or plate-like elastic body. After the parting surface of the housing is fused, the presser piece is inserted and fixed from the insertion hole of the housing and the other end of the elastic body is pressed in the longitudinal direction to fix the elastic piece to the other. It is characterized by being brought into contact with a conductor.

  The attachment method of the thermo protector according to claim 11 is a method of attaching the thermo protector according to any one of claims 1 to 9, and after soldering the housing to the protected device in a state where the press piece is not inserted, It is characterized by inserting and fixing.

  The elastic body is accommodated in a housing, and the other end of the elastic body, one end of which is fixed by a fusible material, is pressed with a pressing piece inserted from the insertion hole of the housing to give elastic bending strain energy to the elastic body. Even if the parting surface of the housing is heat-sealed, the elastic piece can be given elastic bending strain energy by inserting and fixing the presser piece after the heat-sealing. Accordingly, it is possible to eliminate the thermal softening of the fusible material at the time of housing and to achieve safe production without generating defective products.

  Also, when mounting the thermo protector by the flow method or the reflow method, after the housing is soldered to the circuit board by the flow method or the reflow method, the holding piece can be inserted and fixed to give elastic bending strain energy to the elastic body. Therefore, this thermo protector can be safely implemented while guaranteeing good operability.

1 (a) and 1 (b) show an example of the basic structure of the thermoprotector according to the present invention. FIG. 1 (b) shows before operation, and FIG. 1 (b) shows after operation. Yes.
In FIG. 1, reference numeral 1 denotes a housing, and upper and lower divided pieces are assembled by heat fusion by ultrasonic fusion or the like, or bonded by an adhesive. The housing 1 can be made of thermoplastic resin or ceramics. Reference numerals 2 and 20 denote conductors arranged one above the other in the housing, and lead portions are led out of the housing. Fixing of these conductors to the inner surface of the housing can be performed by the riveting protrusion 11, an adhesive, or an adhesive. Reference numeral 3 denotes a linear or plate-like elastic body, one end of which is surface-bonded to one conductor 2 with a soluble material 4. Reference numeral 12 denotes an insertion hole provided on one end surface of the housing, and 5 denotes a pressing piece inserted and fixed through the insertion hole 12. The elastic body 3 is pressed and bent in the longitudinal direction by the pressing piece 5 at the other end. Elastic bending strain energy is maintained. The other end of the elastic body 3 is supported by a recess 51 inside the presser piece 5, and the support state is substantially hinge support. The presser piece 5 is formed of a synthetic resin as will be described later. However, the pressing force can be adjusted by applying rubber elasticity to a portion supporting the other end of the elastic body.
e is a contact surface between the elastic body 3 bent and deformed and the other conductor 20.
Fixing of the presser piece 5 to the housing 1 can be performed by ultrasonic welding or heat welding by laser welding, adhesion by an adhesive, locking of a retaining protrusion provided on the presser piece, or the like.

The bending shape of the elastic body 3 in FIG. 1 is substantially equal to the bending shape when the longitudinal compression force f is applied to the column of the one end fixed and other end hinge support shown in FIG. A shearing force f acts on the joining interface of the one end portion of the body 3 and the one conductor 2 by the soluble material 4, and further, a cleavage force (vertical tensile force) based on the bending moment m acts. The bending moment m is smaller than the bending moment acting on both fixed ends when a longitudinal compression force is applied to the columns fixed at both ends.
Therefore, the cleavage force acting on the interface joined by the fusible material 4 can be made sufficiently small, and the joining interface can be kept stable as much.

  2 (a), the bending moment reaction force m acts on the one-end fixed portion when the longitudinal compression force f is applied in the column of the one-end fixed / other-end hinge support in FIG. As shown in FIG. 4, the other end can be regarded as the same as the bending moment m applied to the hinge supporting column, that is, to the both end hinge supporting column so that the bending angle β on one end side becomes 0, Therefore, even if one end of the elastic body is surface-bonded and fixed to one conductor by a fusible material, if the angle of the elastic body facing the one end is β, the bending moment acting on one end of the elastic body is almost zero. The reaction force acting on the fixed interface of the surface bonding by the fusible material can be only the shearing force.

  FIG. 3 shows an example in which the elastic body of the thermoprotector according to the present invention is different from the above-described embodiment in the bending state. In the example of FIG. 3A, one end of the elastic body 3 is set at a predetermined angle β. 3, the folded portion is fixed to one conductor 2 by surface bonding with a fusible material 4, and then the pressing piece 5 is pressed against the other end of the elastic body 3 so as to bend and deform the elastic body 3. In the example of (b), one end portion of the elastic body 3 is folded at a predetermined angle β through a vertical portion 30 equal to one conductor thickness, and the inner surface of this folded portion is a soluble material on the back surface of the tip portion of one conductor 2. 4 is fixed by surface bonding, and then the pressing piece 5 is pressed against the other end of the elastic body 3 to bend and deform the elastic body 3. In the example of FIG. Bend at a predetermined angle (π−β) and fix one end of the bent portion to one conductor 2 with a soluble material 4 by surface bonding. And, it is constituted such that it is bent and deformed elastic member 3 is pressed against the pressing piece 5 to the other end of the elastic body 3 in the following.

According to these bending states of the elastic body, the bending moment reaction force acting on one end of the elastic body can be made sufficiently small. The reason for this will be described with reference to FIG.
As shown in FIGS. 4A to 4B, a vertical force q is applied to the other end side of the elastic body 3 whose one end is joined and fixed to one conductor 2 with a soluble material 4 at a predetermined angle β. When the other end is brought close to one conductor 2, a bending moment reaction force m is generated at one end portion of the elastic body 3 in a direction that decreases the angle β. Next, as shown in FIG. 4C, when the elastic piece 3 is pressed against the other end of the elastic body 3 and elastic bending strain energy is applied to the elastic body, an angle (β−Δβ) on one end side of the elastic body is obtained. The bending moment reaction force m ′ is applied in the direction of increasing. The bending moment reaction force m ′ reduces the bending moment reaction force m, and the angle β is a specific angle (the deflection angle of the hinge support when the longitudinal compression force acts on the pillars of the hinge support at both ends). Sometimes the bending moment reaction force m ′ cancels out the bending moment reaction force m, and the bending moment reaction force acting on one end of the elastic body becomes zero.
As described above, in the thermo protector according to the present invention, the bending moment reaction force acting on the fixed joint portion by the soluble material between the one end portion of the elastic body and the one conductor can be sufficiently reduced, and the main reaction force is reduced in the longitudinal compressive force. Based on the shear force.

  The shear stress τ of the joint interface is given by τ = p / S, where p is the longitudinal compressive force acting on the elastic body 3 and S is the area of the joint interface, and the shear strength of the joint interface exceeds f / S. It needs to be strong. This shear strength must have a sufficient safety factor. For this reason, holes, dents, and notches are provided in both or one of the elastic bodies and / or one of the conductors to be surface-bonded so that the soluble material can be used. It is desirable to increase the shear strength of the joining interface by roughening one or both of the contact piece end portion or one lead conductor portion to be bitten or surface-bonded. Moreover, in order to reinforce mechanically the interface surface-bonded with the said soluble material, a soluble material can also be arranged. Moreover, the elastic body part joined by a soluble material can also be changed into the raw material excellent in weldability locally.

  In order to manufacture the thermo protector according to the present invention, it is possible to use a conductor with an elastic body in which one end portion of a wide elastic body is surface-bonded to a wide conductor with a soluble material, and this is divided and cut into strips.

In the thermo protector according to the present invention, it is preferable to use a vertically divided type housing and to share the housing piece.
FIG. 5 (FIG. 5 (a) is a plan view, (b) is a cross-sectional view of FIG. 5 (a), (c) is a left side view, and (d) is a right side view) An example of the housing piece is shown. Side wall portions 14 and 14 are provided on both sides of the base portion 13, a step 15 is provided at the center in the longitudinal direction, and the convex portion 16 for conductor pressing is provided at one end side in the longitudinal direction of each side wall portion 14 and 14. , 16 and triangular ridges 17 as ultrasonic welding energy directors are provided on the inner half of the upper surface of each side wall. Further, a rivet projection 11 having a narrower width than the inner width of the housing piece is provided on one end side of the base portion. Reference numeral 12 denotes a cutout portion that serves as a presser piece insertion hole, and is formed only in one housing piece.

In order to manufacture the thermo-protector according to the present invention using this housing piece, FIG. 6-1 [FIG. 6-1 (A) is a plan view, and (B) is the same as FIG. -B cross-sectional view, similarly (C) is a cross-sectional view of (C) in FIG. 6A], the elastic body-equipped conductor A ( The width of one end side of the conductor portion is slightly narrowed so as to be equal to the inner width between the pressing convex portions 65, 65) and fixed to one housing piece 10 in the hole by heating crushing of the ribeting projection 11. Further, as shown in FIG. 6B, the conductor 20 without an elastic body is also provided with a hole, and the hole is fixed to the other housing piece 10 ′ by heat crushing of the riveting protrusion 11. Both housing pieces are up and down and the direction of the lead wires of the conductors 2 and 20 is reversed. The side walls of both housing pieces 10 and 10 'are engaged with each other by the engagement of the steps (15 and 15 in FIG. 6), and the conductor of the other housing piece 10' is placed on both sides of the conductor portion 2 of the conductor A with elastic body. The pressing convex portions 16 and 16 are brought into contact with each other, and then set on an ultrasonic welding machine to crush and weld the energy directors of both housing pieces. [(B) in FIG. 6-2]
At this stage, no elastic strain energy has been applied to the elastic body, and the fusible body is in an unloaded state. Therefore, despite the heating for crushing the riveting protrusion and the ultrasonic welding of both housing pieces, etc. It is possible to stably maintain a fixed joint interface with a soluble material.
Next, as shown in FIGS. 6B to 6D, the presser piece 5 is inserted from the notch 12, the presser piece 5 is pressed against the other end of the elastic body 3, and elastic bending strain is applied to the elastic body 3. Energy is applied to bring the elastic body 3 into contact with the other conductor 20, and at this point, the presser piece 5 is fixed to the housing, thereby completing the production of the thermo protector.

In order to fix the presser piece, as shown in FIG. 6-3, the presser piece 5 is provided with a retaining protrusion 51, and the retaining protrusion 51 is formed on the inner edge of the notch 12 with respect to the pulling direction. It can be locked.
Instead of this locking and fixing, it can also be fixed by an adhesive or heat fusion such as ultrasonic welding or leather welding.
Even in the case of thermal welding such as ultrasonic welding and leather welding, the distance between the fixed joint portion by the soluble material at one end of the elastic body and the welded portion is long, so that the fixed joint state by the soluble material can be stably maintained.

  The load state of the elastic body in the manufacturing process of the thermo protector shown in FIG. 6-2 is as shown in FIG. 4 described above, and when the vertical force q is applied, one conductor 2 is subjected to a bending moment [(( In order to prevent warping and bending at m] of b), one of the conductors 2 is pressed by the pressing convex portions 16 and 16 in FIG. Bending strain energy can be applied smoothly.

  As the elastic body of each of the embodiments described above, a metal, a laminate of a metal and a synthetic resin, a synthetic resin made conductive by mixing metal powder, or the like can be used.

  In the thermo protector of the above embodiment, it is normally turned on. When a low-melting-point alloy such as solder or a conductive thermoplastic resin is used for the fusible material, one conductor 2 → the bonding interface by the fusible material 4 → the contact interface between the elastic body 3 and the other conductor 20 → the other conductor 20 The conduction state is always maintained in this path.

  Insulating thermoplastic resin can also be used for the fusible material 4 of the thermo protector of the above embodiment, and in this case, the always conductive state is the contact interface between the one conductor 2 → the other end of the elastic body 3 and the one conductor 2 → elasticity. The contact interface between the body 3 and the other conductor 20 is maintained by the path of the other conductor 20.

  In order to prevent oxidation and corrosion of the contact interface between the elastic body and the other conductor and between the one conductor and the elastic body and maintain a stable continuous state for a long period of time, around the contact interface at room temperature It is preferable to surround with a liquid protective material such as oil (for example, silicon), fats and oils, a high boiling point organic solvent, etc., and before inserting the presser piece, a protective material is applied to the intermediate surface of the elastic body or the other end of the elastic body. Apply and then insert the presser piece to bring the middle of the elastic body into contact with the other conductor and the other end of the elastic body into contact with one of the conductors, and the protective material will be squeezed out from the contact interface with the contact pressure. Thus, the periphery of the contact interface is naturally surrounded by a protective material, and the contact interface can be a good electrical contact surface.

In the above-mentioned thermo protector, when the soluble material is heated to the melting point or the softening point due to an increase in the external temperature, the elastic strain energy of the elastic body is released and the contact portion between the elastic body and the other conductor is released. Off.
FIG. 1B shows the state of the off operation, where the other end of the elastic body 3 from which the elastic strain energy has been released is stored in the recess 51 of the presser piece 5, and the one end of the elastic body 3 and the other end The crushing head of the riveting protrusion 11 is interposed between the conductor 20 and re-conduction is prevented.

FIGS. 7-1 (a) (before operation) and (b) (after operation) show an embodiment different from the above of the thermoprotector according to the present invention.
In FIG. 7A, reference numeral 1 denotes a housing, which is divided as described above, and its parting surfaces are joined by heat fusion or an adhesive. Ceramics or synthetic resin can be used as the material. 2a is a movable conductor and 20a is a fixed conductor. Reference numeral 3 denotes an elastic body, and one end portion thereof is surface-bonded and fixed to the base surface of the housing 1 with a soluble material 4. Reference numeral 5 denotes a pressing piece inserted and fixed in the insertion hole 12 of the housing 1. The other end of the elastic body 3 is pressed to apply elastic bending strain energy to the elastic body 3, and the movable conductor 2 a is bent by the bending deformation reaction force of the elastic body 3. Is in contact with the fixed conductor 20a.
As the soluble material 4, a thermoplastic resin or a soluble alloy can be used. In order to join and fix one end of the elastic body 3 to the base surface of the housing 1 with the fusible alloy 4, it is preferable to metallize the base surface of the housing by sticking / etching metal foil or printing / baking metal powder paste. .
For example, phosphor bronze metal can be suitably used for the elastic body 3, but since conductivity is not required, the resin (thermoplastic resin or thermosetting resin) is reinforced with fibers such as glass fiber, metal fiber, and synthetic fiber. FRP, high-rigidity engineering plastic, etc. can also be used.

  In order to join and fix one end of the elastic body 3 to the base surface of the housing 1 with the fusible material 4, the one end of the elastic body 3 is angled substantially zero by the fusible material 4 as shown in FIG. Fixing by surface bonding, fixing one end of the elastic body 3 at a predetermined angle with a bendable material 4 at a predetermined angle, as shown in FIG. As shown in 3 (c), one end of the elastic body 3 can be folded back and the folded end can be fixed by surface bonding with the soluble material 4.

  To manufacture the thermo protector shown in Fig. 7-1, heat-bonding the parting surface of the housing without applying elastic bending strain energy to the elastic body, and inserting and fixing the presser piece from the insertion hole of the housing at the final stage Then, the other end of the elastic body is pressed, the elastic body is bent and deformed, and the movable conductor is brought into contact with the fixed conductor by the bending. In this case, at the time of heat-sealing the parting surface of the housing, the elastic body has not yet been subjected to elastic bending strain energy, and is not heated in a state where elastic bending strain energy is applied to the elastic body. Even if it is done, since it is only heating at a position sufficiently separated from the soluble material to the extent that the presser piece is fused to the housing, it is possible to safely maintain the bonded and fixed state by the soluble material.

In the thermo protector shown in FIG. 7A, the conductor is normally conducted along the path of the fixed conductor 20a → the contact surface between the fixed conductor 20a and the movable conductor 2a → the movable conductor 2a. Since the soluble material 4 is not included in the conduction path, the conductivity of the soluble material is not involved in the conductivity.
When the soluble material 4 is heated to its melting point or softening point due to an increase in external temperature, the surface bonding by the soluble material 4 between the elastic body 3 and the housing base surface is released by the bending strain energy of the elastic body 3. Then, the elastic body 3 is restored to the original linear shape, and the movable conductor 2a is detached from the fixed conductor 20a due to its elasticity, and the non-returning off operation is completed.

  In order to attach the thermo protector according to the present invention to a protected device, for example, when mounted on a circuit board, the elastic body is not subjected to elastic strain energy, that is, the press method is not inserted and fixed in the flow method or reflow. It is attached to the circuit board by soldering, and after this attachment, the pressing piece can be inserted and fixed to hold the elastic strain energy in the elastic body. In this case, at the time of flow or reflow soldering, elastic bending strain energy is not yet applied to the elastic body, and flow or reflow soldering is performed without elastic bending strain energy being applied to the elastic body. Therefore, it is possible to safely maintain the bonded and fixed state with the soluble material.

  In the above embodiment, the lead wire portion is provided on the conductor. However, a chip type in which electrodes are provided on the outer surfaces of both end portions of the housing and each electrode is electrically connected to the conductor may be used.

  When using a metal as an elastic body, phosphor bronze can be illustrated, for example. Examples of the composite of the elastic metal material and the synthetic resin include a laminate of a phosphor bronze plate and a polyamide film.

  In the case of a metal elastic plate, the elastic body 2 has, for example, a thickness of 0.008 to 0.1 mm, a width of 0.3 to 4.6 mm, and a length of 1.5 to 11 mm.

  The resin used for the housing and the presser piece can be a different resin, but is particularly preferably a pocket carbonate.

Examples of the resin as the elastic body 2 and the thermoplastic resin as the soluble material 3 include polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polybutylene terephthalate, and polyphenylene oxide. Engineering plastics such as polyethylene sulfide and polysulfone, engineering plastics such as polyacetal, polyphenylene sulfide, polyoxybenzoyl, polyetheretherketone and polyetherimide, polypropylene, polyvinylchloride, polyvinylacetate, polymethylmethacrylate , Polyvinylidene chloride, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, ethylene vinyl acetate copolymer (EVA), AS resin, ABS resin, ionomer AAS resin, can be selected ones of a predetermined melting point from in ACS resin.
In addition to these resins, ceramics can also be used for the housing and the pressing piece. The dimensions of the housing are, for example, a thickness of 0.3 to 1.5 mm, a width of 1 to 5 mm, and a length of 2 to 12 mm.

As the soluble alloy as the soluble material, it is preferable to use an alloy that does not contain elements harmful to biological systems such as Pb and Cd. The following composition [A] (1) 43% <Sn ≦ 70%, 0.5% ≦ In ≦ 10%, remaining Bi, (2) 25% ≦ Sn ≦ 40%, 50% ≦ In ≦ 55%, remaining Bi, (3) 25% <Sn ≦ 44%, 55% <In ≦ 74%, 1% ≦ Bi <20%, (4) 46% <Sn ≦ 70%, 18% ≦ In <48%, 1% ≦ Bi ≦ 12%, (5) 5% ≦ Sn ≦ 28%, 15% ≦ In <37%, remaining Bi (however, Bi57.5%, In25.2%, Sn17.3% and Bi54%, In29.7%, Sn16.3% based on Bi ± 2%, (Except for the range of In and Sn ± 1%), (6) 10% ≦ Sn ≦ 18%, 37% ≦ In ≦ 43%, remaining Bi, (7) 25% < n ≦ 60%, 20% ≦ In <50%, 12% <Bi ≦ 33%, (8) Ag, Au, Cu, Ni, Pd, Pt, 100 parts by weight of any one of (1) to (7) Add one or more of Sb, Ga, Ge, and P in a total of 0.01 to 7 parts by weight, (9) 33% ≦ Sn ≦ 43%, 0.5% ≦ In ≦ 10%, remaining Bi, ( 10) Add 3-5 parts by weight of Bi to 100 parts by weight of 47% ≦ Sn ≦ 49%, 51% ≦ In ≦ 53%, (11) 40% ≦ Sn ≦ 46%, 7% ≦ Bi ≦ 12% , Remaining In, (12) 0.3% ≦ Sn ≦ 1.5%, 51% ≦ In ≦ 54%, remaining Bi, (13) 2.5% ≦ Sn ≦ 10%, 25% ≦ Bi ≦ 35% , Remaining In, (14) any one or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P in 100 parts by weight of any one of (14), (9) to (13) 0.01 to 7 parts by weight in total, (15) 10% ≦ Sn ≦ 25%, 48% ≦ In ≦ 60%, 100 parts by weight of the remaining Bi is Ag, Au, Cu, Ni, Pd, Pt, Sb, In-Sn-Bi based alloy composition [B] (16) 30% ≦ Sn ≦ 70%, such as addition of 0.01 to 7 parts by weight of one or more of Ga, Ge, and P in total. 3% .ltoreq.Sb.ltoreq.20%, the balance Bi, (17) (16), 100 parts by weight of Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P or a total of 0.1 or more. Composition of Bi—Sn—Sb alloy such as addition of 01 to 7 parts by weight [C] (18) 52% ≦ In ≦ 85%, remaining Sn, (19) In 100 parts by weight of (18), Ag, Au, In-Sn based compounds such as addition of 0.01 to 7 parts by weight of one or more of Cu, Ni, Pd, Pt, Sb, Ga, Ge, and P [D] (20) 45% ≦ Bi ≦ 55%, remaining In, (21) Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, 100 parts by weight of the composition of (20) Composition of In-Bi alloy such as addition of 0.01 to 7 parts by weight of one or more of P, [E] (22) 50% Bi ≦ 56%, remaining Sn, (23) (22 The composition of a Bi-Sn alloy such as Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P is added in a total of 0.01 to 7 parts by weight to 100 parts by weight of [F] (24) Add one or more of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, and P to 100 parts by weight of In, in total 0.01 to 7 parts by weight, (25) Au, Bi, Cu, Ni, Pd, Pt, Ga, G in 100 parts by weight of 90% ≦ In ≦ 99.9%, 0.1% ≦ Ag ≦ 10% e, one or more of P are added in a total of 0.01 to 7 parts by weight, (26) Au in 100 parts by weight of 95% ≦ In ≦ 99.9%, 0.1% ≦ Sb ≦ 5%, Composition of In-based alloy such as addition of 0.01 to 7 parts by weight of one or more of Bi, Cu, Ni, Pd, Pt, Ga, Ge, and P (27) 2% ≦ Zn ≦ 15%, 70% ≦ Sn ≦ 95%, the remaining Bi and its alloy 100 parts by weight, total of 0.01 to 7 parts by weight of one or more of Au, In, Cu, Ni, Pd, Pt, Ga, Ge, P A composition having a melting point suitable for the operating temperature of the thermoprotector can be selected from the composition of the added alloy.
Moreover, b. c. c and c. p. By containing a large amount of metal having a crystal structure such as h, plastic deformation can be suppressed and the creep strength can be improved.

  In the case of these alloys, particularly Bi-rich alloys, it is preferable to coat the elastic body in layers.

  As the conductor, a conductive metal or alloy such as nickel, copper, or copper alloy can be used, and can be plated as necessary.

  In battery packs for lithium ion secondary batteries, lithium polymer secondary batteries, etc., a thermo protector for detecting abnormal heat generation such as a battery or a power transistor and de-energizing is necessary. In the thermo protector according to the present invention, however, Miniaturization is easy, it can be incorporated well into a battery pack, and it can be suitably used as a thermo-protector for the battery.

It is drawing which shows one Example of the thermo protector which concerns on this invention. It is drawing which shows the mechanical state of the pillar of one end hinge support and other end fixation used in order to show the stress state of the elastic body in the thermoprotector which concerns on this invention, and a both-ends hinge support pillar. It is drawing which shows the example from which the surface joining structure by the soluble material of the elastic body one end part and conductor in the thermoprotector which concerns on this invention differs. 4 is a diagram illustrating a process of bending an elastic body and surface-bonding one end portion thereof to a conductor with a soluble material in the manufacture of the thermo protector according to the present invention. It is drawing which shows the housing of the thermoprotector which concerns on this invention. It is drawing which shows the initial process in manufacture of the thermo protector which concerns on this invention. It is drawing which shows the subsequent process in manufacture of the thermo protector which concerns on this invention. It is drawing which shows the latching structure of the presser piece in the thermoprotector which concerns on this invention. It is drawing which shows the Example different from the above of the thermoprotector which concerns on this invention. It is drawing which shows the example from which the surface bonding fixing structure by the soluble material of the elastic body in another Example differs. It is drawing which shows the conventional thermo protector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 11 Insertion hole 10 Housing piece 2 One conductor 2a One conductor 20 The other conductor 20a The other conductor 3 Elastic body 4 Soluble material 5 Pressing piece

Claims (11)

A member constituting the contact and a linear or plate-like elastic body for opening and closing the contact are accommodated in the housing, one end of the elastic body is fixed by a soluble material, and the other end of the elastic body is inserted into the housing The elastic body is pressed in the longitudinal direction by a presser piece inserted and fixed from the hole, and the elastic body is elastically bent and deformed, so that the contact is held in an on state. A thermo protector characterized in that the elastic strain energy is released and the contact is turned off. One end of a linear or plate-like elastic body is fixed to one conductor of a pair of conductors arranged at predetermined vertical intervals in the housing by a soluble material, and the other end of the elastic body is elongated by a presser piece. 2. The thermo protector according to claim 1, wherein the elastic body is elastically bent and deformed by being pressed in the direction, and the bending elastic body is brought into contact with the other conductor to constitute a contact. The thermoprotector according to claim 1 or 2, wherein a retaining protrusion is provided on the presser piece to be retained in the insertion hole in the pulling direction. The thermoprotector according to claim 2 or 3, wherein the one or more end portions of the linear or plate-like elastic body are fixed to one conductor by a soluble material by surface bonding. 4. The thermo protector according to claim 2, wherein one end of the linear or plate-like elastic body is folded back, and the folded end is surface-bonded to one conductor by a soluble material. The thermo protector according to any one of claims 2 to 5, wherein the elastic body is any one of a metal, a polymer of a metal and a resin, or a composite. The thermoprotector according to any one of claims 2 to 6, wherein the soluble material is a low-melting-point metal or a thermoplastic resin. The thermoprotector according to claim 1, wherein the contact is surrounded by a protective material. 2. The thermoprotector according to claim 1, wherein the soluble material is a low melting point metal or a thermoplastic resin, and the elastic body is any one of a metal, a polymer or a composite of a metal and a resin, or a resin. A method of manufacturing the thermoprotector according to any one of claims 1 to 9, wherein a member constituting a contact and a linear or plate-like elastic body having one end fixed with a soluble material are accommodated in a divided housing, A thermo protector characterized in that, after the parting surface is fused, the pressing piece is inserted and fixed from the insertion hole of the housing and the other end of the elastic body is pressed in the longitudinal direction to bring the elastic piece into contact with the other conductor. How to make. A method of attaching the thermoprotector according to any one of claims 1 to 9, wherein the presser piece is inserted and fixed after the housing is soldered to a protected device in a state where the presser piece is not inserted. Installation method.

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