JP2005063792A - Heat sensitive element and thermo-protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the long-term stability of a heat sensitive element of non-return type having as an operating source the stored elastic strain energy of an elastic material. <P>SOLUTION: The elastic materials 11, 12 are held in the shape of storing elastic strain energy by unifying a fusible material 3 with the surfaces of the elastic materials. Softening or melting of the fusible material 3 releases the strain energy, whereby the elastic materials 11, 12 are deformed. The elastic strain needs to be held for the elastic materials 11, 12 to store the elastic strain energy. Since the fusible material 3 is integrated with the elastic material surfaces to hold the elastic strain, the stress exerted on the large interface between the elastic materials 11, 12 and the fusible material 3 can be distributed, thereby suppressing the creep of the fusible material and ensuring the long-term stability of the thermally sensitive element. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat sensitive element that operates using elastic strain energy and a thermo protector using the heat sensitive element.

Conventionally, a bimetal is known as a thermal element using elastic strain. That is, it is known that materials having different thermal expansion coefficients are laminated and integrated, elastic bending stress is generated by heating, and the bending strain is used as a heat sensitive amount.
As an example of this bimetal, a thermal expansion coefficient of α ₁ , α ₂ , elastic modulus of E ₁ , E ₂ , an equal thickness of h, and a laminate of materials having the same width are subjected to distortion caused by a temperature rise t. When the bending radius r is obtained,

1 / r = (α ₁ −α ₂ ) t / h · 24E ₁ E ₂ / [(E ₁ + E ₂ ) ² + 12E ₁ E ₂ ]

Given in.
As is clear from this equation, since the bending strain is proportional to the temperature rise t, it is not possible to obtain a jumping change amount at a specific temperature, and it is used as a thermo protector with a specific temperature as the operating temperature. In order to do so, additional means are required, which complicates the configuration.
There is also a restriction that if the temperature drops, it returns to its original state and is a return type.

  Conventionally, as shown in FIG. 9A, the elastic metal piece 1 'is elastically bent, and both ends of the bending elastic metal piece are resisted against bending reaction force by a soluble alloy 3' having a specific melting point and electrodes 41 ', The elastic bending strain energy is accumulated by joining to 42 ', and when the ambient temperature is raised to the melting point of the soluble alloy 3' and the soluble alloy 3 'is melted, the elastic bending strain energy is released and the figure is released. As shown in 9 (b), there is known one that separates between the elastic metal piece 1 ′ and the electrode 42 ′ and cuts off the energization (see, for example, Patent Document 1). In this thermoprotector, a specific temperature, That is, it can be operated at the melting point of the fusible alloy and is non-returnable. Accordingly, it is possible to solve the problems of the bimetal thermoprotector described above.

JP 7-29481 A

  However, in the thermo protector shown in FIG. 9, the stress distribution in the fusible alloy that supports the elastic bending strain energy of the elastic metal piece is complicated, and stress concentration in the fusible alloy is unavoidable, resulting in malfunction due to creep. It is easy to generate.

  An object of the present invention is to provide a thermo protector that guarantees long-term stability of a non-returnable thermal element that uses the stored elastic strain energy of an elastic material as an operating source and that is excellent in operational reliability using the thermal element. There is.

In the heat-sensitive element according to claim 1, the elastic material is held in a shape storing elastic strain energy by integrating the soluble material on the elastic material surface, and the elastic strain energy is released by softening or melting the soluble material. The elastic material is deformed.
In the heat-sensitive element according to claim 2, the elastic material is a laminated body or a folded body, and the elastic material is held in a shape in which elastic strain energy is stored by integrating the fusible material into the laminated surface of the elastic material or the folded-up surface. The elastic material is deformed by releasing elastic strain energy by softening or melting the fusible material.
The heat sensitive element according to claim 3 is characterized in that, in the heat sensitive element according to claim 1 or 2, an elastic plate is used as the elastic material, and a recess or a hole into which the soluble material bites into the elastic plate is provided.
The thermal element according to claim 4 is the thermal element according to any one of claims 1 to 3, wherein an elastic plate is used as an elastic material, and a soluble material is integrated with a roughened elastic plate surface. And
The thermal element according to claim 5 is characterized in that, in the thermal element according to any one of claims 1, 3, and 4, elastic plates and soluble materials are alternately laminated.
The thermal element according to claim 6 is the thermal element according to any one of claims 1 to 5, characterized in that the elastic material is made of an elastic metal.
The heat-sensitive element according to claim 7 is characterized in that, in the heat-sensitive element according to claim 6, the soluble material is a soluble alloy.
The heat-sensitive element according to claim 8 is the heat-sensitive element according to claim 6, wherein the soluble material is a thermoplastic resin.
The thermal element according to claim 9 is the thermal element according to any one of claims 1 to 5, wherein the elastic plate is made of a resin having elasticity, and the soluble material is a thermoplastic resin.
The heat-sensitive element according to claim 10 is the heat-sensitive element according to any one of claims 1 to 5, wherein the elastic plate is a polymer of a metal plate and a resin plate, and the soluble material is a thermoplastic resin or a soluble alloy. And

A thermo protector according to an eleventh aspect has a contact point between a pair of lead conductors, and the contact point is opened and closed by deformation of the thermal element according to any one of the first to tenth aspects.
A thermo-protector according to claim 12 electrically integrates the elastic metal material of the thermal element according to any one of claims 6 to 8 or 10 with one lead conductor, and between the elastic metal material and the other lead conductor. The contact is opened and closed by deformation of the thermal element.
A thermo protector according to a thirteenth aspect is characterized in that, in the thermo protector according to the eleventh or twelfth aspect, the contacts are joined by a soluble alloy having a melting point equal to or lower than the melting point of the fusible material of the thermal element.

In order to store the elastic strain energy in the elastic material, it is necessary to hold the elastic strain. However, the soluble material is integrated and held on the surface of the elastic material, and the elastic material has a wide interface between the soluble material and the soluble material. Therefore, the stress acting on the interface can be dispersed.
Therefore, the creep of the fusible material can be sufficiently suppressed, and the long-term stability of the thermosensitive element can be well guaranteed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a thermal element according to the present invention. FIG. 1 (a) shows a state before operation, and FIG. 1 (b) shows a state after operation.
In FIG. 2A, 11 and 12 are two elastic plates, and 3 is a soluble material layer integrated between the elastic plates 11 and 12. The shape of the elastic plates 11 and 12 when the elastic bending strain energy is zero is a horizontal plate shape shown in FIG. In FIG. 1A, the elastic plates 11 and 12 are elastically bent under a uniform bending radius, and the bending reaction force is caused by the soluble material layer 3 integrated between the elastic plates 11 and 12. The elastic bending strain energy is retained and stored.
In FIG. 1A, if the bending radius of the thermal element is r, the thickness of each elastic plate is t ₁ , t ₂ , the elastic modulus is E ₁ , E ₂ , and the width is both b, moment reaction force acts _{M 1 = E 1 I 1 /} r (I 1 = bt 1 3/12), is given by _{M 2 = E 2 I 2 /} r (I 2 = bt 2 3/12), the unit Since the elastic bending strain energy per length is given by w ₁ = M ₁ ² / 2E ₁ I ₁ , w ₂ = M ₂ ² / 2E ₂ I ₂ , the elastic bending strain energy W of the entire length of both elastic plates is eventually obtained. Is the length of the elastic plate as L

W = L / (2r ² ) · [(E ₁ I ₁ ) + (E ₂ I ₂ )]

Given in.
This elastic bending strain energy W is held by the strength of the soluble material layer 3, and shear stress acting on the interface between the elastic plates 11, 12 and the soluble material layer 3 and longitudinal stress acting on the inside of the soluble material layer (tensile) The strength of the fusible material layer 3 can withstand stress and compressive stress, and the elastic bending strain energy W is stored.
In the above description, assuming that the thickness, width and elastic modulus of both elastic plates are equal, the bending neutral surface passes through the center of the soluble material layer, and the longitudinal stress state of the soluble material layer in a certain cross section is as shown in FIG. Thus, compressive stress acts on the outer side (elastic plate 12 side) from the neutral surface nn, and tensile stress acts on the inner side (elastic plate 11 side) from the neutral surface nn, and the maximum stress value δmax of both stresses is If the elastic modulus of the soluble material is E ₃ and the thickness is t ₃ ,

δmax = E ₃ t ₃ / (2r)

Further, when the thickness of each elastic plate is t, the shear stress τ acting on the interface between each elastic plate 11 and 12 and the soluble material layer 3 is

τ∝ (t + t ₃ ) / r

Given in.
The shear stress, the tensile stress, and the compressive stress are constant if the bending diameter r of the thermal element is constant along the entire length of the thermal element, and generation of concentrated stress can be eliminated.
In the above, even if the bending radius changes along the length direction of the thermal element, if the degree of the change is moderate, the shear stress, the tensile stress and the compressive stress along the length direction of the thermal element. It is possible to slow down the change of the temperature, and even if there is a slow change of the bending radius along the length direction of the thermal element, generation of concentrated stress can be sufficiently eliminated.

  It is also possible to maintain the elastic bending strain energy only by the shear reaction force at the interface between the elastic plate and the soluble material layer by sufficiently reducing the thickness of the soluble material layer 3 relative to the embodiment shown in FIG.

  In the embodiment shown in FIG. 1, two independent elastic plates are used. However, as shown in FIG. 3, an elastic plate 112 folded and overlapped is used. Can be held together by the soluble material layer 3.

In order to manufacture the heat-sensitive element shown in FIG. 1 or FIG. 3, a plate-like soluble material is sandwiched between elastic plates, and the whole is heated to melt the plate-like soluble material. The elastic plate is bent to give elastic bending strain energy, and then the whole is cooled to solidify the meltable soluble material, and the interface between the soluble material and the elastic plate is integrated. The strength of the solidified soluble material A method of maintaining elastic bending strain energy can be used. In this case, the annealing temperature of the elastic plate needs to be sufficiently higher than the melting point of the soluble material so that the elasticity of the elastic plate can be maintained even at the heating temperature, that is, the melting point of the soluble material.
For this heating, when the elastic plate is a metal plate, electric heating or electromagnetic induction heating can be used outside the heating furnace.

When an elastic metal plate is used for the elastic plate and solder is used for the fusible material, it is desirable to improve the bonding strength using a flux.
For the elastic plate, an elastic metal such as phosphor bronze or a high elastic resin such as a fiber reinforced resin such as glass fiber reinforced polyester resin or an engineering plastic can be used.

  As the soluble material, a soluble alloy such as solder or a thermoplastic resin can be used. Usually, when an elastic metal is used as the elastic material, a soluble alloy or a thermoplastic resin is used as the soluble material, and when a fiber reinforced resin or engineering plastic is used as the elastic material, a thermoplastic resin having a lower melting point than those. Is used.

  As the fusible alloy, it is preferable to use an alloy which 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% ≦ Bi20 %, (4) 46% Sn ≦ 70%, 18% ≦ In 48%, 1% ≦ Bi ≦ 12%, (5) 5% ≦ Sn ≦ 28%, 15% ≦ In 37%, remaining Bi (Bi57. 5%, In25.2%, Sn17.3% and Bi54%, In29.7%, and Sn16.3% are excluded from the range of Bi ± 2%, In and Sn ± 1%), (6) 10% ≦ Sn ≦ 18%, 37% ≦ In ≦ 43%, remaining Bi, (7) 25% Sn ≦ 60%, 20% ≦ In50%, 2% Bi ≦ 33%, any one or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P in 100 parts by weight of any of (8) (1) to (7) 0.01 to 7 parts by weight, (9) 33% ≦ Sn ≦ 43%, 0.5% ≦ In ≦ 10%, remaining Bi, (10) 47% ≦ Sn ≦ 49%, 51% ≦ In ≦ 53% 100 parts by weight of Bi 3-5 parts by weight, (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) (9) to (13) One or two or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, and P are added in a total of 0.01 to 7 parts by weight to any 100 parts by weight of (15) 1 % ≦ Sn ≦ 25%, 48% ≦ In ≦ 60%, the remaining Bi is 100 parts by weight, and one or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P is added Composition of In—Sn—Bi alloy such as 0.01 to 7 parts by weight added [B] (16) 30% ≦ Sn ≦ 70%, 0.3% ≦ Sb ≦ 20%, remaining Bi, (17) Bi-Sn-Sb such that 0.01 to 7 parts by weight of one or more of Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P is added to 100 parts by weight of (16). Composition [C] (18) 52% ≦ In ≦ 85%, remaining Sn, (19) (18) in 100 parts by weight of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, In-Sn alloy composition [D] (20) 45% ≦ Bi ≦ 55%, such that one or more of P is added in a total of 0.01 to 7 parts by weight , Remaining In, (21) and 100 parts by weight of the composition of (20), one or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P are added in a total of 0.01 to 7 In-Bi alloy composition such as addition of parts by weight, [E] (22) 50% Bi ≦ 56%, remaining Sn, (23) In addition to 100 parts by weight of (22), Ag, Au, Cu, Ni, Pd , Pt, Ga, Ge, P One or two or more of a total of 0.01 to 7 parts by weight of a Bi-Sn alloy composition [F] (24) In 100 parts by weight of In, Au, Bi , Cu, Ni, Pd, Pt, Ga, Ge, P or a total of 0.01 to 7 parts by weight, (25) 90% ≦ In ≦ 99.9%, 0.1% ≦ One or two or more of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, and P are added to 100 parts by weight of Ag ≦ 10% in total 0.0 1 to 7 parts by weight, (26) Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, 100 parts by weight of 95% ≦ In ≦ 99.9%, 0.1% ≦ Sb ≦ 5% The composition of the melting point suitable for the operating temperature of the thermosensitive element can be selected from the composition of the In-based alloy such as the addition of 0.01 to 7 parts by weight of one or more of P in total.

  Fiber reinforced resin resin and thermoplastic resin used as the elastic plate and soluble material include polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polybutylene terephthalate, polyphenylene oxide, polyethylene sulfide, Engineering plastics such as polysulfone, engineering plastics such as polyacetal, polycarbonate, polyphenylene sulfide, polyoxybenzoyl, polyether ether ketone, polyetherimide, polypropylene, polyvinyl chloride, polyvinyl acetate, polymethyl methacrylate Rate, polyvinylidene chloride, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, ethylene vinyl acetate copolymer (EVA), AS resin, ABS resin, Io Ma -, AAS resin, can be selected ones of a predetermined melting point among the synthetic resin alone or a fiber-reinforced resin such as ACS resin.

In the thermosensitive element shown in FIG. 1A, when the fusible material 3 is heated to its melting point and softened or melted, the elastic bending strain energy stored in the elastic plates 11 and 12 is released. The elastic plates 11 and 12 are returned to the original shape (horizontal plate shape) shown in (b) of FIG. 1, and the amount of deformation is the thermal output. In this case, since the elastic bending strain energy of the elastic plates 11 and 12 is released simultaneously with the softening of the fusible material 3, a quick operation can be guaranteed.
Until this operation, as described above, the shear stress acts on the bonding interface between the elastic plate and the soluble material layer. Even under the action of the shear stress, the interface between the elastic plate and the soluble material layer is joined with sufficient shear strength so that the shape of the thermal element can be stably maintained, and the soluble material bites into the elastic plate. It is effective to provide a recess, to provide a hole into which the fusible material bites into the elastic plate, to make the surface of the elastic plate rough and to increase the bonding area to the fusible material.

  In the embodiment shown in FIG. 1, two elastic plates are used, but three or more elastic plates can also be used. According to this configuration, the same amount of the entire elastic bending strain energy can be used. The elastic bending strain energy can be distributed and stored according to the number of elastic plates, and the stress acting on the fusible material layer can also be dispersed according to the dispersibility. Can be prevented and further long-term stability of the thermal element can be guaranteed.

FIG. 4 shows another example of the thermal element according to the present invention. FIG. 4A shows a state before the operation, and FIG. 4B shows a state after the operation.
In FIG. 4A, 1 is a single elastic plate, and 3 is a plate-like soluble material integrated with the elastic plate. The shape of the elastic plate when the elastic bending strain energy is zero is a horizontal plate shape shown in FIG.
4A, the elastic plate 1 is elastically bent under a uniform bending radius, and the bending reaction force is held by the plate-like soluble material 3 integrated with the elastic plate 1 to be elastic. Bending strain energy is stored.
In FIG. 4A, if the bending radius of the thermal element is r, the thickness of the elastic plate 1 is t ₁ , the elastic modulus is E ₁ , and the width is b, the elastic bending strain energy W is the length of the elastic plate. Let S be L

W = L (E ₁ I ₁ ) / (2r ² )

Given in.
This elastic bending strain energy W is held by the strength of the plate-like soluble material 3, and shear stress acting on the interface between the elastic plate 1 and the plate-like soluble material 3 and longitudinal stress acting on the inside of the plate-like soluble material (tensile) The plate soluble material 3 can withstand the stress and compressive stress, and the elastic bending strain energy W is stored.

FIG. 5 shows the stress state of the plate-like fusible material 3 of the heat-sensitive element shown in FIG. 4 (a), receiving tensile stress inside the bending from the bending neutral surface nn, and bending outward from the neutral surface nn. A compressive stress is received at the (elastic plate 1 side), and a shearing stress acts on the interface between the elastic plate 1 and the plate-like soluble material 3. The plate-like soluble material 3 withstands these stresses in strength, and the elastic bending strain energy is accumulated.
In FIG. 5, the distance from the elastic plate 1 to the bending neutral plane nn is t ₃ ′, the distance from the plate-like soluble material 3 to the bending neutral plane nn is T ₃ ′, and the bending radius of the thermal element is r, if the elastic modulus of the plate-friendly welding material and E _3, compressive stress at the interface in contact with the elastic plate .delta.m, tensile stress stress .delta.m at the surface of the plate-friendly welding material 3 '

δm = E ₃ t ₃ '/ r

δm ′ = E ₃ T ₃ / r

If the thickness of the plate soluble material is t ₃ , the shear stress τ is

τ∝ (t ₁ + t ₃ ) / r

Given in.
The shear stress, the tensile stress, and the compressive stress are constant if the bending diameter r of the thermal element is constant along the entire length of the thermal element, and generation of concentrated stress can be eliminated.
In this embodiment as well, even if the bending radius changes along the length direction of the thermal element, if the degree of change is moderate, the shear stress, the tensile stress and the compressive stress in the length direction of the thermal element. The change along the length of the heat-sensitive element can be made slow, and even if there is a slow change in the bending radius along the length direction of the thermal element, generation of concentrated stress can be sufficiently eliminated.

In the thermosensitive element shown in FIG. 4A, when the plate-like soluble material 3 is heated to its melting point and softened or melted, the elastic bending strain energy stored in the elastic plate 1 is released and elastic. The plate 1 is returned to the original shape (horizontal plate shape) shown in FIG. 4B, and the amount of deformation is the thermal output. In this case, the elastic bending strain energy of the elastic plate is released simultaneously with the softening of the plate-like soluble material, so that a quick operation can be guaranteed.
Until this operation, as described above, the shear stress acts on the bonding interface between the elastic plate and the plate-like soluble material. Even under the action of the shear stress, the interface between the elastic plate and the plate-like soluble material is joined with sufficient shear strength so that the shape of the thermal element can be stably maintained. It is effective to provide a recess into which the plate-like soluble material bites in, to provide a hole into which the plate-like soluble material bites into the elastic plate, and to increase the bonding area to the plate-like soluble material by roughening the surface of the elastic plate is there.

In the above embodiment, a single metal or a single resin is used for the elastic plate, but a polymer of an elastic metal plate and an elastic resin plate, for example, a laminate of a copper foil and a polyimide film can also be used. In this case, with respect to the fusible material, the fusible alloy is integrated with the metal plate surface, or the thermoplastic resin is integrated with the resin plate surface.
In any of the above embodiments, the original shape of the elastic plate, that is, the shape of the elastic plate in the zero strain state is a flat plate shape, but the original shape may be a non-flat plate shape.
For example, as shown in FIG. 6 (b), the original shape of the elastic plate 1 is made into an arch shape having a height H, and the width of this arch is elastically expanded to reduce the height as shown in FIG. 6 (a). This state is elastically deformed, and this state is maintained by integrating the fusible material 3 to store elastic bending strain energy, and the elastic plate 1 is restored to the original shape shown in FIG. It can also be set as the structure which returns to arch and makes arch height the original H.

FIG. 7A is a plan view showing an example of a thermoprotector according to the present invention, and FIG. 7B is a cross-sectional view of FIG. FIG. 7C is a cross-sectional view showing a state after the operation.
7, 41 and 42 are a pair of lead conductors, and A is a thermal element according to the present invention attached to the end of one lead conductor 41 by spot welding or the like, for example, the thermal element shown in FIG. 1 or FIG. The other end is brought into contact with the end of the other lead conductor 42, and the contact portion is used as the contact 5. 6 is an insulator casing.
The thermo protector according to the present invention is attached in thermal contact with the device. When the device is heated by energization due to some abnormality and reaches the melting point of the soluble material of the thermal element A of the thermo protector, the soluble material is softened or melted, and at the same time, the elastic strain energy stored in the thermal element is released. The operation is quickly performed as shown in FIG. 7C to open the contact, and the power supply to the device is cut off.
In this case, since the thermosensitive element is non-returnable, re-conduction with the abnormality existing is eliminated.

In the thermosensitive element of the thermo-protector of this embodiment, the elastic material of the thermosensitive element is made of metal and has electrical conductivity by itself.
In such a heat-sensitive element, it is also possible to directly attach an end side to be fixed to a battery component and use it integrally with the battery.
Further, in FIG. 7B, the lead conductor 41 and the lower elastic plate 12 of the thermal element A can be made common.

FIG. 8A is a cross-sectional view showing another example of the thermo protector according to the present invention. FIG. 8B is a cross-sectional view showing a state after the operation.
8A, the movable electrode 7 is attached to the end portion of one lead conductor 41, the end portion of the other lead conductor 42 is used as a fixed electrode, and both electrodes are brought into contact with each other at the contact 5, and below the movable electrode 7. The thermal element A shown in FIG. 6 is disposed. When the device is installed in thermal contact with the device and the device is heated by energization due to any abnormality and reaches the melting point of the fusible material of the thermo-protector's heat-sensitive element, the fusible material is softened or melted and simultaneously stored in the heat-sensitive element. The elastic strain energy that has been released is released and quickly operated as shown in FIG. 8B, the height of the thermal element increases, the movable electrode 7 is pushed up by the thermal element A, and the contact 5 is opened to open the device. The power supply to is cut off.
Also in this case, since the thermosensitive element is non-returnable, reconducting while the abnormality is present is eliminated.

  Any of the above thermo protectors can be joined with a solder (soluble alloy) having the same or lower melting point as that of the soluble material of the thermal element in order to improve the electrical conductivity of the contact 5.

  High energy density secondary batteries, such as lithium ion secondary batteries and lithium polymer secondary batteries, have a high heat generation temperature due to the high energy density, and the heat is detected so that the battery is de-energized. Although a protector is required, the thermal element according to the present invention can be incorporated into a battery pack under a reduced size.

It is drawing which shows one Example of the thermal element which concerns on this invention. It is drawing which shows the stress state of the soluble material of (a) of FIG. It is drawing which shows the Example different from the above of the thermal element which concerns on this invention. It is drawing which shows the Example different from the above of the thermal element which concerns on this invention. It is drawing which shows the stress state of the soluble material of (a) of FIG. It is drawing which shows the Example different from the above of the thermal element 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 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 Elastic material 11 Elastic material 12 Elastic material 3 Soluble material 41 Lead conductor 42 Lead conductor 5 Contact A Thermal element

Claims (13)

The elastic material is held in a shape storing elastic strain energy by integrating the soluble material on the elastic material surface, and the elastic material is deformed by releasing the elastic strain energy by softening or melting the soluble material. Thermal element. The elastic material is a laminated body or a folded body, and the elastic material is held in a shape storing elastic strain energy by the integration of the soluble material on the laminated surface of the elastic material or the folded folded surface, and the soluble material is softened or melted. The heat-sensitive element is characterized in that the elastic material is deformed by releasing elastic strain energy. The heat-sensitive element according to claim 1 or 2, wherein an elastic plate is used as the elastic material, and a hollow or hole into which the soluble material bites into the elastic plate is provided. The heat-sensitive element according to claim 1, wherein an elastic plate is used as the elastic material, and the soluble material is integrated with the roughened elastic plate surface. The heat-sensitive element according to claim 1, wherein the elastic plate and the soluble material are alternately laminated. The heat-sensitive element according to claim 1, wherein the elastic material is made of an elastic metal. The heat-sensitive element according to claim 6, wherein the soluble material is a soluble alloy. The heat-sensitive element according to claim 6, wherein the soluble material is a thermoplastic resin. The heat-sensitive element according to claim 1, wherein the elastic plate is made of a resin having elasticity, and the soluble material is a thermoplastic resin. 6. The heat-sensitive element according to claim 1, wherein the elastic plate is a polymer of a metal plate and a resin plate, and the soluble material is a thermoplastic resin or a soluble alloy. A thermo protector comprising a contact point between a pair of lead conductors, wherein the contact point is opened and closed by deformation of the thermal element according to claim 1. 10. The elastic metal material of the heat sensitive element according to claim 6 is electrically integrated with one lead conductor, and a contact between the elastic metal material and the other lead conductor is opened and closed by deformation of the heat sensitive element. A thermo protector, characterized by the fact that The thermo protector according to claim 11 or 12, wherein the contacts are joined together with a soluble alloy having a melting point equal to or lower than that of the soluble material of the heat sensitive element.

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