JP2006331777A - Thermo-protector and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guarantee a long-term stability and improve the reliability of operation of a thermo-protector operated by a release of an elastic strain energy of an elastic body supported by junction and fixation by a fusible body such as solder, caused by fusion of a fusible body. <P>SOLUTION: Both ends 21, 22 of a laminated conductive elastic body 2 in a state of compressed in longitudinal direction is fixed to a lead conductor 1 serving as a framework, and the elastic body 2 is formed into convex curved shape, one end side of the convex curve is erected at a prescribed angle θL' to the framework 1, the other end 22 of the convex curve has a deflection angle 0, fixation of the one end part 21 of the elastic body and the framework 1 is carried out via a fusible material 3, an apex part of the convex curve is contacted with the other reed conductor 10, and the melting point or the softening point of the fusible body 3 is made to be an operation temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thermoprotector whose operating temperature is the melting point or softening point of a fusible material and a method for manufacturing the thermoprotector.

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, in the thermo protector shown in FIG. 9, one end portion 21 ′ of the conductive elastic plate 2 ′ is fixed to the lead conductor 1 ′ by riveting, welding, etc., and the conductive elastic plate 2 ′ is bent into a convex curve to be elastically bent. With the strain energy applied, the other end 22 'of the conductive elastic plate 2' is fixed to the lead conductor 1 'by surface bonding with a soluble material 3' such as a low-melting-point soluble alloy. The bending top portion is in contact with the other lead conductor 10 ', and the contact is released by releasing the elastic bending strain energy by melting or softening the fusible material 3' (see Patent Document 1).

JP 2005-78954 A

In FIG. 9, a shearing stress proportional to the bending rigidity EI of the conductive elastic plate 2 ′ is acting on the bonding interface of the fusible material 3 ′.
Thus, it is necessary to give the conductive elastic plate 2 ′ a certain thickness t in order to serve as a conductive path, and the bending rigidity EI of the conductive elastic plate 2 ′ is given by bEt3 / 12. Since it is proportional to the cube of the thickness t of the conductive elastic plate 2 ′ (b is the width and E is the elastic modulus), the shear stress acting on the joint interface is large. Accordingly, creep is likely to occur in the fusible material 3 ′, and there is a problem in long-term stability.

  The object of the present invention is to guarantee the long-term stability of a thermo protector that operates with the elastic strain energy of the elastic body supporting the elastic strain energy by joining and fixing with a soluble material such as solder as the elastic strain energy is released by melting the soluble body. Therefore, the reliability of the operation is to be improved.

The thermo-protector according to claim 1 is a state in which one end portion of the stacked conductive elastic plates is fixed to the housing surface, the stacked conductive elastic plates are bent into a convex curve shape, and elastic bending strain energy is applied. The other end portion of the stacked conductive elastic plate is fixed to the housing surface, at least one of these two fixings is performed by surface bonding with a soluble material, and the bent top portion of the stacked conductive elastic plate is in contact with the fixed conductor, The contact is released by releasing the elastic bending strain energy by melting or softening a soluble material.
The thermo-protector according to claim 2 is the thermo-protector according to claim 1, wherein the stacked conductive elastic plates are compressed in the longitudinal direction and both ends thereof are fixed to the casing to form a convex curve, and one end of the convex curve is It is set up at a predetermined angle with respect to the housing, and the other end of the convex curve is characterized by a bending angle of 0.
The thermo protector according to claim 3 is the thermo protector according to claim 2, wherein one end of the stacked conductive elastic plate is bent inward, and the bent piece is surface-bonded to the surface of the housing via a soluble material. And
The thermo protector according to claim 4 is the thermo protector according to claim 2, wherein one end of the stacked conductive elastic plate is bent inward, and the inner side surface of the bent piece is surface-bonded to the rear surface of the front end of the housing via a soluble material. It is characterized by.
The thermo protector according to claim 5 is the thermo protector according to claims 1 to 4, wherein the soluble material is a low melting point metal.
The thermo protector according to claim 6 is the thermo protector according to claims 1 to 4, wherein the soluble material is a thermoplastic resin.
The manufacturing method of the thermo protector according to claim 7 is a method of manufacturing the thermo protector according to claim 2, wherein one end portion of the wide stacked conductive elastic plate material is surface-bonded to the wide casing material via the soluble material, The joining material is cut into a number of strips and the elastic piece is folded back at the boundary of the surface joining portion, or the elastic body is folded back at the border of the surface joining portion and the joining material is further stripped into a plurality of strips. The manufacturing method of the thermo protector according to claim 8, wherein the other end portion is fixed to the housing at a bending angle of 0 with the folded elastic body piece compressed in the longitudinal direction. In this method, one end of a wide stacked conductive elastic plate material is surface-bonded to the back surface of the front end portion of a wide casing material via a fusible material, and the bonding material is cut into a number of strips. Furthermore, the elastic piece is placed on the surface side of the housing. Or the elastic material is folded back to the front surface side of the housing material, and the joining material is further cut into a plurality of strips, and then the elastic material piece is folded back in the longitudinal direction and the other end is bent into the housing. It is fixed at an angle of 0.

The thickness of the conductive elastic plate of one thing t, the width b, and the elastic modulus E, the bending rigidity EI of the conductive elastic plate EI = ^Ebt 3/12
Given in.
When the stacking configuration the thickness t of the conductive elastic plate also this one to n divided, the flexural rigidity EI of the stacking conductive elastic plate 'is ^{EI' = Ebn (t / n} ) 3/12 = Ebt 3 / ( 12n ² )
For example, when n = 2, the bending rigidity can be reduced to ¼.
Therefore, as a result of making the conductor cross-sectional area the same and making the bending rigidity ¼, the stress acting on the joining interface by the fusible material can be sufficiently reduced, and the regular creep of the fusible material at the joining interface can be well eliminated, It is possible to satisfactorily prevent malfunction caused by creep of the soluble material at the joint interface.

1-1 (a) and (b) are drawings showing different examples of the basic structure of the thermoprotector according to the present invention.
1-1, (b) and (b), 1 is a lead conductor as a housing, 2 is a stacked conductive elastic plate, for example, a folded conductive elastic plate shown in FIG. Is the other lead conductor.
In (a) of FIG. 1-1, one end portion 21 of the stacked conductive elastic plate 2 is surface-bonded to the surface of the housing 1 by the fusible material 3, and the stacked conductive elastic plate 2 is bounded by the end e of the surface bonded portion. The other end 22 of the stacked conductive elastic plate 2 is applied to the housing 1 in a state where a longitudinal compression force p is applied to the stacked conductive elastic plate 2, for example, riveting, welding, etc. 4, the stacked conductive elastic plate 2 is bent into a convex curve shape with a bending angle of 0, and the top of the convex curve is brought into contact with the other lead conductor 10.
In (b) of FIG. 1-1, one end portion 21 of the stacked conductive elastic plate 2 is surface-bonded to the rear surface of the front end portion of the housing 1 by the fusible material 3, Folded at a predetermined angle θL ′, and the other end portion 22 of the elastic body 2 is applied to the housing 1 in a state in which the longitudinal compression force p is applied to the stacked conductive elastic plate 2 by an appropriate means such as riveting or welding 4. The stacked conductive elastic plate 2 is bent into a convex curve by surface bonding at 0, and the top of the convex curve is brought into contact with the other lead conductor 10.
In any basic structure, the stacked conductive elastic plate 2 is deformed into a convex curve shape and the elastic bending strain energy is accumulated. When the fusible material 3 is melted or softened, the fixation by the surface bonding is released. Then, the elastic bending strain energy is released and the height h of the convex curve is reduced, and this reduction becomes a thermal signal and the sensor is operated. In any basic structure, the one end portion 20 of the elastic body 2 deformed into a convex curve shape is mechanically equivalent to a rigid joint having a predetermined angle.

FIG. 2 shows a column (Long column) for fixing one end and supporting the other end hinge used for considering the mechanical state of the stacked conductive elastic plate 2.
In FIG. 2, when the bending moment at the point (x, y) is Mx,

d2y ^/ dx 2 = -Mx ^/ EI
(Where EI is the bending rigidity of the column) and the bending moment Mx is

Mx = py-Mox / L
Since the convex curve shape y is p / EI = k ² ,

y = A [coskx- (sinkx / kL) + (x / L) -1]
tankL = kL
Since the height of the convex curve y is known h at x = L ′, the coefficient A is given by

y _{x = L ′} = h, (dy / dx) _{x = L ′} = 0
It can be obtained more.
Therefore, the deflection angle θL at the hinge support end is

θL = (dy / dx) _{x = L} = A [(cosk L / L) −k (sink L) + (1 / L)]
Given in.

In FIG. 2, the mechanical state does not change even if the hinge support end is mechanically frozen (even if it is replaced with a rigid joint having the same angle as the deflection angle of the hinge support end). Thus, one end of the solid line (A) in FIG. 3 is a rigid node n with an angle θL, the other end has a flexion angle of 0, and a bending moment reaction force at one rigid node n of a column with a longitudinal compressive force p is 0. is there.
Now, as shown by the dotted line (b) in FIG. 3, assuming a column in a bent state where the angle of the rigid joint at one end is θL ′ and the deflection angle at the other end is 0, the bending moment reaction force ML acting on the rigid joint at one end is assumed. 'Corresponds to the bending moment required to distort the angle θL of one end rigid joint n to angle θL' in the state of the solid line (b) where the bending moment reaction force of one end rigid joint n is 0, and θL and θL The smaller the difference from ', the smaller the bending moment reaction force ML' acting on one end rigid joint of the dotted line (b).
Therefore, in the thermo protector according to the present invention, in FIG. 1, the angle of the rigid joint 20 fixed to the rigid joint at one end is set to a predetermined angle θL ′, and the bending angle at the other end 22 is set to 0. Since the body 2 is fixed at both ends under a predetermined longitudinal compressive force load p, the angle θL ′ of the rigid joint can be set to be close to the angle θL at which the bending moment reaction force becomes zero. The bending moment reaction force at the fixed portion of the elastic body one end 21 through the soluble material 3 can be reduced, and the reaction force acting on the bonding interface by the soluble material 3 is the reaction force against the longitudinal compression force p, that is, the shear stress. Therefore, it is possible to satisfactorily prevent the stress that cleaves the joint interface based on the bending moment reaction force from acting.

The shear stress τ at the joint interface is given by τ = p / S, where p is the longitudinal compressive force acting on the elastic body and S is the area of the joint interface. Thus p is
p = k ² EI
The secondary moment I of the cross section of the conductive elastic plate can be sufficiently reduced due to the stacking of the conductive elastic plate, and the shear stress τ can be reduced, so that the creep of the soluble material can be satisfactorily prevented.
In order to further stabilize the bonding interface, one or both of the other end of the elastic body or the surface of the housing is provided with holes, dents, and notches so that the fusible material is bitten in, or the other end of the elastic body that is surface bonded It is desirable to enhance the shear strength of the bonding interface by using one or both of the part and the housing surface as a rough surface. Moreover, in order to reinforce the interface surface-bonded with the said soluble material mechanically, a soluble material can also be piled up over the front end surface and housing surface of an elastic body.

As the fusible material 3, a fusible alloy such as solder, a single metal or a thermoplastic resin, or a conductive thermoplastic resin to which conductive powder is added can be used.
Coating a soluble material on one or both sides of the entire length of the elastic body to equalize the bending rigidity of the entire length of the elastic body is effective for preventing concentration of bending stress.

As will be described later, the base of the housing of the thermo protector can be used for the casing, but usually, an electrode having a lead portion is used as the casing, and one end of the elastic body is a soluble material on the tip end side of the electrode. It is surface-joined via.
As shown in FIGS. 4A to 4B, the set member of the electrode and the elastic body is obtained by folding the conductive elastic plate material to obtain the wide stacked conductive elastic plate material 2a, which is shown in FIG. As shown in FIG. 4D, one end of the wide stacked conductive elastic plate 2a is surface-bonded to the front surface of the wide electrode material 1a through a soluble material 3a by a heat roller, electromagnetic induction heating, or the like. As shown in FIG. 4E, the stacked conductive elastic plate 2 can be folded back at a predetermined angle.
It is also possible to surface-join the wide-width electrode material and the wide-width stacked conductive elastic plate material, fold the stacked conductive elastic plate material at a predetermined angle, and then cut the strip into multiple strips.
The folding of the stacked conductive elastic plate piece 2 or the wide stacked stacked conductive elastic plate material 2a can be performed by turning it to the housing surface side opposite to the joint surface 3a as shown in FIG.

  After the set member of the electrode and the elastic body is manufactured, the other end 22 of the stacked conductive elastic plate 2 is fixed to the surface of the housing by surface bonding at a bending angle of 0. For fixing, rivet with a projection of a synthetic resin (having a softening point higher than the softening point of the soluble material) as a stator, and a melting point or softening point higher than the melting point or softening point of the soluble material. It is possible to use adhesive such as resistance welding or electromagnetic induction heating welding (preferably welding using flux).

As described above, the thermo protector according to the present invention is mechanically equivalent to a column having one end fixed and the other end hinge supported, and the stored elastic property is that the height of the convex curve is h and the length of the elastic body is L. The bending strain energy is an intermediate value between the elastic bending strain energy 2h ² π ⁴ / L ³ of the both-end fixed column and the elastic bending strain energy h ² π ⁴ / (2L ³ ) of the both-end hinge supporting column, and the elastic body is bent at both ends. Compared to the case where both ends are fixed at 0, the elastic body length can be shortened under the same amount of accumulated elastic bending strain energy, which is advantageous for miniaturization of the thermo protector.
In addition, when the height h of the convex curve is the same between the column with one end fixed and the other end hinge supported and the column with both ends fixed, the former has a longer total length of the convex curve than the latter (1.2 times). Therefore, when the total length of the convex curve is the same, the distance between the two fulcrums of the column is shortened, so that the length of the thermo protector according to the present invention can be shortened accordingly.

5A is a plan view of an embodiment of the thermoprotector according to the present invention, FIG. 5B is a cross-sectional view of FIG. 5A, and FIG. FIG. 6 shows a cross-sectional view of FIG.
In FIG. 5, 51 and 52 are a pair of electrodes arranged with a gap therebetween, and 510 and 520 are lead portions of the respective electrodes. The electrode 51 is also used as a housing. Reference numeral 2 denotes a stacked conductive elastic plate. The one end portion 21 is folded back so as to form a rigid joint having the angle θL ′, and is fixed to the tip portion of the electrode 51 by surface bonding via a soluble metal 3. A longitudinal compressive force p is applied to the stacked conductive elastic plate 2 to apply bending strain energy to the stacked conductive elastic plate 2, and the other end 22 of the stacked conductive elastic plate 2 faces the electrode 51 at a deflection angle of 0. It is fixed by riveting or the like 4 by contact, is further surrounded by a housing 6, and the convex curved outer surface of the stacked conductive elastic plate 2 is brought into contact with the other electrode 52.
The housing 6 is made of an insulator such as ceramics or synthetic resin, and has an upper and lower split structure, and can be assembled by fusion, for example, high frequency welding, an adhesive, a fitting method, or the like.

In this thermoprotector, the electrical connection is normally made in the path of the lead portion of one electrode → the elastic plate → the contact surface between the elastic plate and the other electrode → the lead portion of the other electrode. Since the soluble material 3 is not included in the conduction path, the conductivity of the soluble material is not involved in the conductivity, and a thermoplastic resin can also be used as the soluble material.
The operation of the thermo protector will be described. When the fusible material 3 is heated to its melting point or softening point due to an increase in external temperature, the elastic plate one end portion 21 and one electrode 51 are caused by the bending strain energy of the elastic plate 2. 6 is released, the elastic plate 2 is restored to its original flat shape as shown in FIG. 6, and the bending height of the elastic plate is reduced to 0. Contact with the electrode 52 is removed, and non-returning energization is turned off. In this case, since it is a requirement for starting the operation that the soluble material melts or softens and the elastic strain energy of the elastic body is released, even if stringing of the soluble material occurs, the operation performance may be affected. Absent.
After the operation, in order to ensure reliable insulation between the folded portion at the tip of the elastic body and the other electrode, it is desirable to provide an insulating film 502 on the other electrode 52 as shown in FIG.
The contact pressure acts on the contact surface between the convex curved outer surface of the elastic plate 2 and the other electrode 52 in FIG. 5B, and the contact resistance is reduced. In order to further reduce the contact resistance, The contact surfaces can be joined with solder having a melting point lower than that of the soluble material. In this case, it is preferable to make the low melting point solder layer sufficiently thin in order to suppress stringing.

In the thermo protector according to the present invention, it is preferable to share the upper and lower housing pieces, and FIGS. 7-1 to 7-5 show the embodiments.
7-1 [(a) in FIG. 7-1 is a plan view, (b) is a cross-sectional view of (b) in FIG. 7-1, (c) is a left side view, (d)] Is a right side view] shows an example of the housing piece 60. Side walls 62, 62 are provided on both sides of the base 61, a step 63 is provided in the center in the longitudinal direction, and one end in the longitudinal direction of each of the side walls 62, 62 is shown. Are provided with protrusions 5 and 5 for holding the lead conductor, and triangular protrusions 64 as an ultrasonic welding energy director are provided on the inner half of each side wall. Further, a riveting protrusion 4 having a narrower width than the inner width of the housing piece is provided on one end side of the base portion.

In order to manufacture the thermo protector according to the present invention using this housing piece, the lead conductor with a contact piece (the width on one end side of the lead conductor portion is slightly equal to the inner width between the pressing convex portions 620 and 620). 7-2 [(b) in FIG. 7-2 is a plan view, and (b) is a cross-sectional view of (b) in FIG. (C) is a cross-sectional view of (c) c) in FIG. 7-2], the lead conductor 1 with the contact piece 2 in which the hole is formed is inserted into one housing piece 60 in the hole and the ribeting projection 4 is formed. As shown in FIG. 7-3, the lead conductor 10 without a contact piece is also provided with a hole and fixed to the other housing piece 60 by the heat crushing of the riveting protrusion 4 as shown in FIG. 7-3. Then, as shown in FIG. The lead conductor portions of the lead conductors with contact pieces are overlapped so that the direction of the lead portions of the lead conductor portions 1 and 10 is reversed and the side walls of both housing pieces 60 and 60 are engaged with each other by the engagement of the steps 63 and 63. The lead conductor pressing convex portions 5 and 5 of the other housing piece are brought into contact with both sides of the width of 1 and then set in an ultrasonic welding machine to crush and weld the energy directors of both housing pieces. Finish production.
It is also possible to use leather welding or an adhesive instead of the ultrasonic welding.

  As shown in FIG. 7-5, the lead portion 1r of one lead conductor 1 is bent through a step along the housing end surface so that the height levels of the lead portions 1r and 10r of both the lead conductors 1 and 10 are matched. You can also.

8 (a) is a plan view of another embodiment of the thermoprotector according to the present invention, FIG. 8 (b) is a cross-sectional view of FIG. 8 (b), and one lead conductor is shown. It is made of stacked elastic metal, and the lead wire tip is used as an elastic body of the thermo protector.
FIG. 8 (c) is a diagram showing the operation of the embodiment described above.
In FIG. 8, reference numeral 1 denotes a housing base housing, which is made of an insulator such as ceramics or synthetic resin. Reference numeral 510 denotes one lead conductor, the tip 2 is made of a two-plate elastic metal, and the front end of the tip 2 is bent inward with respect to the base housing 1 so as to form the rigid joint of the angle θL ′ described above. The bent piece is surface-bonded via a fusible material 3, for example, a thermoplastic resin, and in this state, a longitudinal compression force p is applied to the distal end portion 2 to give bending strain energy, and the rear portion of the distal end portion 2 is placed on the housing surface. The thermo protector according to the present invention is configured by being fixed by surface contact with a rivet, welding or the like 4.
When using a fusible metal for joining and fixing the surface of the elastic lead conductor tip 2 to the housing surface, the housing surface was metallized by attaching / etching a metal foil or printing / baking a metal powder paste. You can do it above.
Reference numeral 520 denotes the other flat lead conductor, in which the tip 52 is bent and brought into contact with the bent top surface of the one elastic lead conductor tip 2.
Reference numeral 6 denotes a housing, which is made of an insulator such as ceramics or synthetic resin, and is bonded to the base casing by fusion, for example, high frequency welding (when the base and the housing are both synthetic resin), an adhesive, or a fitting method. It is.

In this thermoprotector, the lead conductor 510 is normally conducted through the path of one lead conductor 510 → the contact surface between the convex curve portion of the lead conductor tip 2 and the tip 52 of the other lead conductor 520 → the other lead conductor 520. Yes. Since the soluble material 3 is not included in the conduction path, the conductive property of the soluble material is not involved.
The operation of this thermo protector will be described. When the fusible material 3 is heated to its melting point or softening point due to an increase in external temperature, the tip of one lead conductor is caused by the bending strain energy of one elastic lead conductor tip 2. The surface joining by the fusible material 3 between the part 2 and the housing surface is released, and the elastic lead conductor tip 2 is returned to the original flat plate shape as shown in FIG. The height is reduced to zero, the contact surface between the one elastic lead conductor tip 2 and the tip 52 of the other lead conductor 520 is detached, and the non-returning energization-off is completed.

  Also in the above, the contact pressure acts on the contact surface between the bent outer surface of the elastic lead conductor tip 2 and the tip 52 of the other lead conductor 520 to reduce the contact resistance. However, the contact resistance is further reduced. Therefore, the contact surface can be joined with a solder having a melting point lower than that of the aforementioned soluble material.

  In the above-described embodiment of the thermoprotector according to the present invention, the bending moment acting on the part is made zero so that the cleavage force does not act on the joining interface of the fusible body and the stacked conductive elastic body with the soluble material. However, since the bending moment can be sufficiently reduced because of the low bending rigidity of the stacked conductive elastic body, it is possible to adopt a mechanical configuration in which the bending moment acts. .

  For example, phosphor bronze can be used as the elastic metal material. As the elastic material, a composite of an elastic metal material and a synthetic resin, for example, a laminate of a phosphor bronze plate and a polyamide film can be used.

  In the case of a metal elastic plate, the dimensions of the elastic body are, 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.

Examples of the resin as the elastic material and the thermoplastic resin as the soluble material include polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polybutylene terephthalate, polyphenylene oxide, polyethylene sulfide, and polysulfone. Engineering plastics such as plastic, polyacetal, polycarbonate, polyphenylene sulfide, polyoxybenzoyl, polyether ether ketone, polyetherimide, polypropylene, polyvinyl chloride, polyvinyl acetate, polymethyl methacrylate, Polyvinylidene chloride, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, ethylene vinyl acetate copolymer (EVA), AS resin, ABS resin, ionomer, A S 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. 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) 100 parts by weight of Bi-Sn alloy such as Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P or a total of 0.01 to 7 parts by weight of one or more of them. Composition [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, 100 parts by weight of 90% ≦ In ≦ 99.9%, 0.1% ≦ Ag ≦ 10% Add one or more of Ge and P 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 The composition of the melting point suitable for the operating temperature of the thermo protector 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 metal elastic body in layers.

For the above-mentioned electrodes and lead conductors, conductive metals or alloys such as nickel, copper, and copper alloys can be used, and can be plated as necessary.
As described above, an electrode or an electrode can be provided at the tip of the lead conductor, and the tip of the elastic metal lead conductor can be crushed into an elastic plate shape.
In these cases, the shape of the lead conductor outside the housing and the housing can be any shape.
The joint of the electrode, the lead conductor, the elastic body, or both of the fusible metals can be replaced with a material having excellent weldability locally.
The thickness of the lead-attached electrode or lead conductor is, for example, 0.05 to 0.3 mm, and the width is 0.5 to 4.6 mm.

  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 the thermoprotector which concerns on this invention. It is drawing which shows the accumulation electroconductive elastic board in the thermo protector of FIGS. 1-1. It is drawing which shows the mechanical state of the pillar of one end hinge support and other end fixation. It is drawing which shows the mechanical state of the thermoprotector which concerns on this invention. It is drawing which shows the manufacturing method of the housing with an elastic body used for the thermoprotector which concerns on this invention. It is drawing which shows one Example of the thermo protector which concerns on this invention. It is drawing which shows the operation | movement of the thermo protector shown in FIG. It is drawing which shows an example of the housing piece used for the thermoprotector which concerns on this invention. It is drawing which shows a part of process in the case of manufacturing a thermo protector using the housing piece of FIGS. It is drawing which shows a part different from the above of the process in the case of manufacturing a thermo protector using the housing piece of FIGS. It is drawing which shows a part different from the above of the process in the case of manufacturing a thermo protector using the housing piece of FIGS. It is drawing which shows one Example of a thermo protector using the housing piece of FIGS. 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 conventional thermo protector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead conductor 10 as a housing | casing The other lead conductor 2 Stacked conductive elastic body 21 One end part 22 of a stacked conductive elastic body The other end part 3 of a stacked conductive elastic body 3 Soluble material 4 Riveting 51 Electrode 52 Electrode 51 Fixed electrode 52 Movable Electrode 6 housing

Claims (8)

One end of the stacked conductive elastic plate is fixed to the housing surface, and the other end of the stacked conductive elastic plate in a state where the stacked conductive elastic plate is bent into a convex curve shape and elastic bending strain energy is applied. The part is fixed to the housing surface, at least one of these fixations is performed by surface joining with a soluble material, and the bending top of the stacked conductive elastic plate is in contact with the fixed conductor, and the above-mentioned by melting or softening of the soluble material A thermo protector, wherein the contact is released by releasing elastic bending strain energy. In a state where the stacked conductive elastic plate is compressed in the longitudinal direction, both ends thereof are fixed to the casing to form a convex curve, and one end of the convex curve is raised at a predetermined angle with respect to the casing. The thermo-protector according to claim 1, wherein the end has a bending angle of 0. The thermo-protector according to claim 2, wherein one end of the stacked conductive elastic plate is bent inward, and the bent piece is surface-bonded to the surface of the housing via a soluble material. 3. The thermo protector according to claim 2, wherein one end of the stacked conductive elastic plate is bent inward, and the inner side surface of the bent piece is surface-bonded to the rear surface of the front end of the housing via a soluble material. The thermoprotector according to claim 1, wherein the soluble material is a low melting point metal. The thermoprotector according to any one of claims 1 to 4, wherein the soluble material is a thermoplastic resin. A method of manufacturing the thermoprotector according to claim 2, wherein one end of a wide stacked conductive elastic plate material is surface-bonded to a wide casing material via a soluble material, and the bonding material is cut into a plurality of strips. Furthermore, the elastic piece is folded back at the surface joint portion, or the elastic material is folded back at the surface joint portion, and the joint material is further cut into a plurality of strips, and then the folded elastic body piece is elongated. A manufacturing method of a thermo protector, wherein the other end is fixed to the housing at a bending angle of 0 in a state compressed in the direction. A method of manufacturing the thermosensor according to claim 3, wherein one end of a wide stacked conductive elastic plate is surface-bonded to a back surface of a front end of a wide casing material via a soluble material, and the bonding material is formed into a plurality of strips. Cut the piece into pieces and then fold the elastic piece back to the surface side of the case, or turn the elastic piece back to the surface side of the case and cut the joining material into pieces of strips, and then fold the elastic piece A method of manufacturing a thermo protector, wherein the other end is fixed to the housing at a bending angle of 0 in a state compressed in the longitudinal direction.

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