JP2006155974A - Thermoprotector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoprotector working when elastic deformation energy of an elastic body supported via binding fixation by a fusible material such as solder is released by fusion of the fusible material. <P>SOLUTION: A contact piece 2, in which one lead conductor part 1 between both lead conductor parts 1 and 10 housed on the upper side and the lower side in a housing 6 has elasticity, is fixed in the both end parts while being bent for holding elastic deformation energy, and at least one side fixation 21 is carried out by face binding via the fusible material 3, while the other lead conductor part 10 is brought into contact with the bent contact piece 2. The periphery of the contact part is surrounded by a protection coat. When the fusible material is melted/softened, the elastic deformation energy is released to interrupt electric conduction between the both lead conductors. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thermo protector whose operating temperature is the melting point or softening point of a soluble material.

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. A method of releasing elastic strain energy by melting or softening a soluble material is known.
For example, as shown in FIG. 9 (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 joining with a melting alloy (solder) 3 ′ having a melting point and the ambient temperature is raised to the melting point of the melting alloy 2 ′ and the melting alloy is melted, 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).
Further, as shown in FIG. 10 (a), a pellet 2 ′ having a predetermined melting point, a seat plate 15 ′, a compression spring 1 ′, and a seat plate 16 from one end side in a metal case 14 ′ having a lead terminal 13 ′ attached to one end. 'Is sequentially accommodated, and the contact 42' whose outer periphery is slidably contacted with the inner surface of the metal case is accommodated, and the lead pin through bushing 17 'is fixed to the other end side of the metal case 14'. A trip spring 18 'is assembled between the lead terminal 13', the metal case 14 ', the contact 42', and the lead pin 41 ', and the ambient temperature is raised to the melting point of the pellet 2'. When the pellet 2 'is melted, the compressive stress of the compression spring 1' is released as shown in FIG. 10B, and the contact 42 'from the tip of the lead pin 41' is released by the compressive stress of the tripping spring 18 '. Release There is also known one that blocks the conduction path at a distance and is called a so-called pellet type thermal fuse (see Non-Patent Document 1).

JP 7-29481 A Page 818 of Electrical Engineering Handbook 1988

However, in the method shown in FIG. 9, since the bending reaction force M ′ and the spreading force F ′ of the elastic metal piece act on the soluble alloy (solder), the stress distribution in the soluble alloy is complicated, and stress concentration occurs. Based on this, creep is likely to occur, and malfunction is likely to occur. Furthermore, since the fusible alloy is a part of the current path, heat is generated due to an increase in resistance due to creep of the fusible alloy, and there is a concern about an operation error due to self-heating. Furthermore, malfunctions due to stringing of the molten alloy can also occur.
Further, in the method shown in FIG. 10, even if the pellets can be uniformly compressed for pressure equalization by the seat plate, the structure is complicated, and disadvantages in terms of downsizing and cost cannot be avoided.

  An object of the present invention is to provide a thermo protector that operates satisfactorily by the elastic strain energy of the elastic body supporting the elastic strain energy by joining and fixing with a soluble material such as solder being released by melting of the soluble body. .

  The thermo protector according to claim 1 is fixed at both ends in a bent state in which a resilient contact piece holds elastic strain energy on one lead conductor portion of both lead conductor portions accommodated in the housing one above the other. One of the lead conductor portions is in contact with the bent contact piece, and the periphery of the contact portion is surrounded by a protective coat. The elastic strain energy is released by melting or softening the fusible material, and electrical conduction between both lead conductors is interrupted.

  The thermo protector according to claim 2 is characterized in that, in the thermo protector according to claim 1, the protective coat is any one of oil, fats and oils, an organic solvent, a wax having a melting point lower than that of the soluble material, or a thermoplastic resin. .

  The thermo protector according to claim 3 is the thermo protector according to claim 1 or 2, wherein the elastic contact piece is elastically deformed in a convex curve shape on the other lead conductor portion side, and one end of the contact piece is folded back. The folded portion is surface-bonded to one lead conductor portion via a fusible material.

  The thermo protector according to claim 4 is the thermo protector according to any one of claims 1 to 3, wherein the soluble material is a low melting point metal.

  The thermo protector according to claim 5 is the thermo protector according to any one of claims 1 to 3, wherein the soluble material at the surface joining portion between the one end side of the contact piece and the one lead conductor portion is a thermoplastic resin. The other end side and the one lead conductor portion are fixed under electrical conduction.

  The thermo protector according to claim 6 is the thermo protector according to any one of claims 1 to 5, characterized in that the elastic contact piece is a metal or a polymer or a composite of a metal and a resin.

  The thermo protector according to claim 7 is the thermo protector according to any one of claims 1 to 6, wherein the housing is divided into two parts in the vertical direction, and one lead conductor portion to which the elastic contact piece is fixed is one of the thermo protectors. It is accommodated in the divided housing piece, the other lead conductor portion is accommodated in the other divided housing piece, and both the divided housing pieces are combined.

  The thermo protector according to claim 8 is the thermo protector according to claim 7, wherein the upper and lower divided housing pieces are the same product.

An elastic contact piece is fixed at both ends in a bent state holding elastic strain energy to one lead conductor portion of both lead conductor portions accommodated in the housing above and below each other. In the thermo-protector in which the other lead conductor portion is in contact with the bent contact piece, the other material is fixed without using a soluble material, and the other lead conductor portion is in contact with the bent contact piece. If the sliding at the contact location is poor when melted, the elastic strain energy stored in the bending contact piece portion between the contact location and the fixed location not through the other soluble material is quickly released. hard.
In this invention, the said contact location is surrounded by the protective coat, and the slip fall by oxidation or corrosion can be excluded well. In addition, as a result that the contact piece can be stably held in a mechanical state substantially the same as the mechanical state when the column of the hinge support at one end is compressed in the axial direction, one lead conductor at one end of the elastic contact piece corresponding to the hinge support point side The bending moment reaction force can be well suppressed from acting on the fixed part to the part, and the stress acting on the interface between the elastic contact piece and one lead conductor part through the fusible material is mainly sheared. It is possible to reduce well the cleavage force based on the bending moment reaction force acting on the interface as a stress.
Therefore, it is possible to stably hold the surface bonding interface by the fusible material, to prevent the fusible material at the bonding interface from creeping, and to keep the slipping property of the electrical contact portion as the initial state, thereby achieving a good quick operation.

1 (a) to 1 (c) show an example of the basic structure of the thermoprotector according to the present invention, FIG. 1 (a) shows before operation, and FIG. 1 (b) shows after operation. (C) in FIG. 1 is a cross-sectional view taken along the line ha in FIG.
In FIG. 1, 6 is a housing, and 1 and 10 are lead conductor portions disposed one above the other in the housing. Reference numeral 2 denotes an elastic contact piece. The tip end portion 21 is folded back and fixed to the upper surface of the tip end portion of one lead conductor portion 1 via a fusible material 3 and is bent by a horizontal compression force p. The bending angle αL ′ on the front end side is made substantially equal to an angle αL described later, and the rear end side 22 is fixed to the lead conductor portion 1 with the bending angle 0 by welding, riveting or the like.
Elastic bending strain energy is held in the contact piece 2 bent in this way.
The other lead conductor portion 10 is in electrical contact with the bending contact piece 2, and the contact portion is surrounded by a protective coat. As this protective coating agent, oil, fats and oils, an organic solvent, wax having a melting point lower than that of the soluble material, thermoplastic resin, or the like can be used. In particular, it is preferable to hold a liquid at room temperature in the gap around the contact portion by capillary action.
In FIG. 1A, the elasticity of the contact piece 2 having a bending angle αL ′ on the front end side 21, a bending angle 0 on the rear end side 22, a horizontal compression force p at a fixed point, and a height h. The bending state of the contact piece is substantially equal to the bending state due to the horizontal compression force p of the column fixed to one end and supported by the other end hinge.

FIG. 2 shows a state of bending by a horizontal compression force p of a column (Long column) fixed at one end and supported at the other end hinge.
In FIG. 2, when the bending moment at the point (x, y) is M _x ,

d ² y / dx ² = −M _x / EI
(Where EI is the bending rigidity of the column) and the bending moment Mx is

M _x = 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 αL at the hinge support end is

αL = (dy / dx) _{x = L} = A [− (coskL) / L−k (sinkL) + (1 / L)]
Given in.

  In FIG. 2, even if the hinge support end is dynamically frozen (even if the hinge support end is bent and the hinge support is changed to a fixed support), the mechanical state does not change. Accordingly, if the deflection angle αL ′ in FIG. 1 (a) is made equal to the deflection angle αL in FIG. 2, the joint portion between the tip side of one lead conductor portion 1 and the elastic contact piece 2 in FIG. Thus, it is possible to eliminate the bending moment from acting on the joint, and it is possible to cause only the shear stress to act on the joining interface of the soluble material 3. Accordingly, it is possible to satisfactorily prevent the stress that attempts to cleave the joint interface based on the bending moment reaction force.

  The shear stress τ of the joint interface is given by τ = p / S, where p is the horizontal compressive force acting on the contact piece 2 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, a hole, a recess, or a notch is provided in both or one of the contact piece 2 and / or one lead conductor 1 of the portion to be surface-bonded. It is desirable to increase the shear strength of the bonding interface by biting the fusible material 3 or by roughening one or both of the contact piece end portion or one lead conductor portion to be surface-bonded. Moreover, in order to reinforce the interface surface-bonded by the said soluble material 3, a soluble material can also be arranged.

  The contact piece 2 may be a metal or a composite of a metal and a synthetic resin. The composite includes a resin mixed with metal powder. Thus, when using a thing with high electrical resistance value like a metal powder mixed resin for an elastic body, a soluble material can be fuse | melted by the energization heat_generation | fever by the overcurrent of a resistor, and a protector can also be operated.

The fusible material 3 may be a low melting point soluble alloy such as solder, a low melting point soluble single metal or thermoplastic resin, or a conductive thermoplastic resin to which conductive powder is added. The surface bonding through the fusible material 3 can be performed by welding using energization heating or electromagnetic induction heating. It is preferable to apply a flux to the weld interface.
Coating the fusible material on one or both sides of the entire length of the contact piece to equalize the bending rigidity of the entire length of the elastic body is effective for preventing concentration of bending stress.

In FIG. 1A, one lead conductor portion 1 → contact piece 2 → contact surface between the contact piece 2 and the other lead conductor portion 10 → the other lead conductor portion 10 is always electrically connected along the path. Yes.
In this state, (1) the stress acting on the interface between the one lead conductor portion 1 and the contact piece 2 through the fusible material 3 is mainly a uniform distribution of shear stress, and the fusible material due to stress concentration. can be eliminated 3 creep, (2) the reaction force based on the bending of the contact piece 2 (horizontal compressive force p in FIG. 2, refer to the bending moment reaction force M ₀₎ is acts on one of the lead conductor portion 1, Since the lead conductor portion 1 is fixed and the lead conductor portion 1 has sufficient bending rigidity, the entire lead conductor portion 1 can be mechanically and stably held. We can guarantee the condition. Therefore, stable electrical conduction can be ensured.

  The contact surface between the contact piece 2 and the other lead conductor portion 10 can be joined with a fusible metal having a melting point lower than that of the fusible material 3 to reduce the electric contact resistance.

  When the soluble material 3 is melted or softened due to an increase in the ambient temperature, as shown in FIG. 1B, the restriction of the bending contact piece 2 by the soluble material 3 is released, and the bending contact piece 2 is elastically bent. The strain energy is released, the bending contact piece 2 is restored to the original linear shape, the contact between the other lead conductor portion 10 and the contact piece 2 is removed, and the electrical conduction is interrupted.

で与えられる。
而るに、前記接触箇所ｅの周囲を保護コートで包囲しており、接触箇所が酸化や腐食（特に異種金属腐食）等で固まるのを防止できて接触箇所の当初の滑り性をよく保持できるから、前記の貯蔵弾性歪エネルギーＷが小さくても、そのエネルギーを迅速に解放させることができる。従って、接触片を薄くしても、迅速な遮断作動をサーモプロテクタの小型化のもとで達成できる。 In (a) of FIG. 1, the deflection y of the contact piece 2 is as described above.
y = A [coskx- (sinkx) / kL + (x / L) -1]
And the bending moment M (x) at position x is M (x) = EI · d ² y / dx ²
The elastic strain energy W stored in the contact piece portion between the contact point e between the contact piece 2 and the other lead conductor portion 10 and the contact piece rear end 22 is given by

Given in.
Therefore, the periphery of the contact point e is surrounded by a protective coat, and the contact point can be prevented from solidifying due to oxidation or corrosion (particularly, dissimilar metal corrosion), and the initial slipperiness of the contact point can be maintained well. Therefore, even if the storage elastic strain energy W is small, the energy can be released quickly. Therefore, even if the contact piece is made thin, a quick shut-off operation can be achieved with the miniaturization of the thermo protector.

In the above description, the electrical continuity between the one lead conductor portion 1 and the contact piece 2 can be ensured by a soluble material when a soluble metal or a conductive thermoplastic resin is used as the soluble material 3.
For the binding between the one lead conductor portion 1 and the contact piece rear end portion 22, welding such as spot resistance welding, laser welding, ultrasonic welding, high frequency welding or electromagnetic induction heating welding, or riveting can be used.
In order to improve the weldability between the lead conductor portion and the elastic contact piece, it can be replaced with a material that is locally excellent in weldability.
When an insulating thermoplastic resin is used as the fusible material 3, electrical continuity is ensured at the location where the lead conductor portion 1 and the contact piece rear end 22 are bonded.

  In the example shown in FIG. 1, the distal end side 21 of the contact piece 2 is folded back at an angle of approximately αL ′, and the folded portion is surface-bonded to the upper surface of the distal end portion of one lead conductor portion 1 via a soluble material 3. The rear end side 22 is bonded to the rear end side of one lead conductor portion 1 at an angle of 0 with a horizontal compression force p applied thereto by welding or riveting, as shown in FIG. Thus, the front end side 21 of the contact piece 2 is folded back at an angle of approximately αL ′ through the rise 211 of the contact piece thickness, and the folded portion is surface-bonded to the back surface of the front end portion of one lead conductor portion 1 via the soluble material 3. The rear end side 22 of the contact piece 2 can be bonded to the rear end side of one lead conductor portion 1 by welding or riveting at an angle of 0 in a state where the horizontal compression force p is applied. Further, as shown in FIG. 3B, the distal end side 21 of the contact piece is bent at an angle of approximately (π−αL ′), and the bent portion 21 is put on the upper surface of the distal end portion of one lead conductor portion 1 with a soluble material. The contact piece 2 can be bonded to the one lead conductor portion 1 at an angle 0 by welding or riveting in a state where a horizontal compression force p is applied.

  Further, as shown in FIG. 4A, the rear end side 22 of the contact piece 2 is folded back at an angle of approximately αL ′, and the folded portion 22 is interviewed via the fusible material 3 on the upper surface of one lead conductor portion 1. 4, the distal end side 21 of the contact piece 2 is bonded to the distal end side of one lead conductor portion 1 at an angle 0 with a horizontal compression force p applied, by welding or riveting, 2, the rear end side 22 of the contact piece 2 is bent at an angle of approximately (π−αL ′), and the bent portion 22 is surface-bonded to the upper surface of one lead conductor portion 1 via the fusible material 3 and contacted. It is also possible to bind the distal end side 21 of the piece 2 to the distal end side of one lead conductor portion 1 by welding or riveting at an angle of 0 with a horizontal compression force p applied.

5 (a) to 5 (c) show another example of the basic structure of the thermoprotector according to the present invention, FIG. 5 (a) shows before operation, and FIG. 5 (b) shows after operation. (C) in FIG. 5 shows a cross-sectional view of the ha-ha in FIG.
In FIG. 5, 5 is a housing, and 1 and 10 are lead conductor portions arranged one above the other in the housing. Reference numeral 2 denotes an elastic contact piece whose front end is folded back at an angle βL ′ and fixed to the upper surface of the front end of one lead conductor portion 1 by surface bonding via a fusible material 3, and by a horizontal compression force p. In the bent state, the bending angle βL ′ of the distal end side 21 is substantially equal to an angle βL described later. The rear end side 22 is bent at an angle of approximately (π−βL ′) and is fixed to the lead conductor portion 1 by welding or riveting at an angle substantially equal to the deflection angle βL ′ of the front end side 21. The bent contact piece 2 retains elastic bending strain energy.
The other lead conductor portion 10 is brought into contact with the bending contact piece 2, and the periphery of the contact portion is surrounded by a protective coat in the same manner as described above.
In FIG. 5A, an elastic contact piece having a bending angle of βL ′ at the front end side 21, a bending angle of approximately βL ′ at the rear end side 22, a horizontal compressive force p at a fixed point, and a height of h. The bending state of 2 is substantially equal to the bending state due to the horizontal compression force p of the column supported by the hinges at both ends.

FIG. 6 shows a bent state due to a horizontal compression force p of a column supported by hinges at both ends.
In FIG. 6, when the bending moment at the point (x, y) is M _x ,

d ² y / dx ² = −M _x / EI
(Where EI is the bending stiffness of the column) and the bending moment M _x is

M _x = py
Since the convex curve shape y is p / EI = k ² ,

y = B ・ sinkx
sinkL = 0
Given in
Therefore,

y = B · sin (πx / L)
Given in.
The coefficient B is h where the height of the convex curve y is known at x = L / 2.

y _{x = L / 2} = h, (dy / dx) _{x = L / 2} = 0
Can ask more

B = h
Given in.
Therefore, the deflection angle βL at the hinge support end is

βL = (dy / dx) _{x = L or 0 = hπ / L}
Given in.

  In FIG. 6, the mechanical state does not change even if the hinge support ends are dynamically frozen (even if both hinge support ends are bent at the same angle and changed to both fixed supports). Therefore, if the deflection angle βL ′ in FIG. 5A is substantially equal to the deflection angle βL in FIG. 6, the tip 21 of one lead conductor portion 1 and the elastic contact piece 2 in FIG. It is possible to eliminate only the bending moment from acting on the joining portion and allow only the shear stress to act on the joining interface of the soluble material 3. Accordingly, it is possible to satisfactorily prevent the stress that attempts to cleave the joint interface based on the bending moment reaction force.

  As described above, the shear stress τ at the joining interface is given by τ = p / S, where p is the horizontal compressive force acting on the elastic contact piece, and S is the area of the joining interface, and the shear strength at the joining interface is f / The strength needs to exceed S. This shear strength must have a sufficient safety factor, and a hole, a dent, or a notch is formed in both or one of the leading end of the contact piece and one lead conductor portion to be surface-bonded via a soluble material. It is desirable to increase the shear strength of the bonding interface by providing a bite of a soluble material and roughening one or both of the front end of the contact piece and one lead conductor portion to be surface-bonded via the soluble material. Moreover, in order to reinforce mechanically the interface surface-bonded with the said soluble material, a soluble material can also be arranged.

The contact piece 2 may be a metal or a composite of a metal and a synthetic resin.
The composite includes a resin mixed with metal powder. Thus, when using a thing with high electrical resistance value like a metal powder mixed resin for an elastic contact piece, a soluble material can be fuse | melted by the energization heat_generation | fever by the overcurrent of a resistor, and a protector can also be operated.
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 the fusible material on one or both sides of the entire length of the elastic contact piece to equalize the bending rigidity of the entire length of the elastic contact piece is effective in preventing concentration of bending stress.

In FIG. 5A, one lead conductor portion 1 → contact piece 2 → contact surface between the contact piece 2 and the other lead conductor portion 10 → the other lead conductor portion 10 is always electrically connected along the path. Yes.
In this state, (1) the stress acting on the interfacial bonding interface between the one lead conductor portion 1 and each end of the contact piece 2 through the fusible material 3 is mainly a uniformly distributed shear stress. Creep of fusible material due to concentration can be eliminated, and (2) reaction force based on bending of the contact piece 2 (see horizontal compression force p in FIG. 6) acts on one lead conductor portion 1, but the lead conductor portion Since the whole can be mechanically and stably held by fixing one and the sufficient bending rigidity of the lead conductor portion 1, a stable electrical contact state between the other lead conductor portion 10 and the contact piece 2 can be ensured. Therefore, stable electrical conduction can be ensured.

  As shown in FIG. 5B, when the soluble material 3 is melted or softened due to an increase in ambient temperature, the bending contact piece 2 is released from the restraint by the soluble material 3, and the bending contact piece 2 is elastically bent. The strain energy is released, the bending contact piece 2 is restored to the original linear shape, the contact between the other lead conductor portion 10 and the contact piece 2 is released, and the electrical conduction is interrupted.

で与えられる。
而るに、前記接触箇所ｅの周囲を保護コートで包囲しており、接触箇所が酸化等で固まるのを防止できて接触箇所の当初の滑り性をよく保持できるから、前記の貯蔵弾性歪エネルギーＷが小さくても、そのエネルギーを迅速に解放させることができる。従って、接触片を薄くしても、迅速な遮断作動をサーモプロテクタの小型化のもとで達成できる。 In (a) of FIG. 5, the deflection y of the contact piece 2 is as described above.
y = B · sin (πx / L)
And the bending moment M (x) at position x is M (x) = EI · d ² y / dx ²
The elastic strain energy W stored in the contact piece portion between the contact point e between the contact piece 2 and the other lead conductor portion 10 and the contact piece rear end 22 is given by

Given in.
Therefore, since the contact portion e is surrounded by a protective coat, the contact portion can be prevented from solidifying due to oxidation or the like, and the initial sliding property of the contact portion can be well maintained. Even if W is small, the energy can be released quickly. Therefore, even if the contact piece is made thin, a quick shut-off operation can be achieved with the miniaturization of the thermo protector.

In the above description, the electrical continuity between the one lead conductor portion 1 and the contact piece 2 can be ensured by a soluble material when a soluble metal or a conductive thermoplastic resin is used as the soluble material 3.
For the binding between the one lead conductor portion 1 and the contact piece rear end portion 22, welding such as spot resistance welding, laser welding, ultrasonic welding, high frequency welding or electromagnetic induction heating welding, or riveting can be used.
In order to improve the weldability between the lead conductor portion and the elastic contact piece, it can be replaced with a material that is locally excellent in weldability.
When an insulating thermoplastic resin is used as the fusible material 3, electrical continuity is ensured at the location where the lead conductor portion 1 and the contact piece rear end 22 are bonded.

  In the example shown in FIG. 5A, the front end side 21 of the contact piece 2 is folded at an angle of approximately βL ′, the rear end side 22 of the contact piece 2 is folded at an angle of approximately (π−βL ′), and the front end side folded portion is formed. 21 is joined to the upper surface of the tip of one lead conductor portion 1 via a fusible material 3 and the rear end side 22 is fixed at an angle of approximately βL ′ by applying a horizontal compression force p and welding or riveting. As shown in FIG. 7 (a), the front end side 21 of the contact piece 2 is turned back at an angle βL ′ through a rise 211 of the contact piece thickness, and the rear end side 22 of the contact piece 2 is set at an angle of approximately (π−βL ′). The front end side folded portion 21 is surface-joined to the upper surface of the leading end portion of one lead conductor portion 1 via the fusible material 3, and a horizontal compression force p is applied to the rear end side by welding or riveting to form an angle of approximately βL ′. It can also be fixed with. Further, as shown in FIG. 7B, the front end side 21 of the contact piece 2 is bent at an angle of approximately (π−βL ′), and the rear end side 22 of the contact piece 2 is bent at an angle of approximately (π−βL ′). The bent end portion 21 is joined to the upper surface of the leading end portion of one lead conductor portion 1 via the fusible material 3, and the rear end side 22 is applied with a horizontal compression force p at an angle of approximately βL ′ by welding or riveting. It can also be fixed.

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, and FIGS. 8-1 to 8-5 show the embodiments.
8-1 [(a) in FIG. 8-1 is a plan view, (b) is a cross-sectional view of (b) in FIG. 8-1, [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 convex portions 65, 65 for pressing the lead conductor, and triangular ridges 64 as ultrasonic welding energy directors are provided on the inner half of the upper surface 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, a 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 both pressing convex portions 65, 65). 8-2 [(b) in FIG. 8-2 is a plan view, and (b) is a cross-sectional view of the roll in FIG. (C) is a cross-sectional view of (B) in FIG. 8-2]. As shown in FIG. 8-2, the lead conductor 1 with the contact piece 2 having the hole formed therein is connected to the one housing piece 60 in the hole. As shown in FIG. 8-3, 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. 8-3. Then, as shown in FIG. 8-4, protection of oil or the like on the upper surface of the contact piece 2 The sheet material 5 is attached, and both housing pieces are overlapped with each other so that the lead conductor portions 1 and 10 are in opposite directions, and the side walls of both housing pieces 60 and 60 are engaged with the steps 63 and 63. The lead conductor pressing convex portions 65, 65 of the other housing piece are brought into contact with the width sides of the lead conductor portion 1 of the lead conductor with the contact piece, and then set on an ultrasonic welding machine, and the energy of both housing pieces is set. The director is crushed and welded to complete the production of the thermo protector.
It is also possible to use leather welding or an adhesive instead of the ultrasonic welding.
Airtightness is not required for the connection between the upper and lower housing pieces. Even under the air permeability between the inside and outside of the housing, as described above, the initial sliding property of the contact state between the contact piece 2 and the other lead conductor portion 10 can be well maintained for the air blocking action of the protective coating agent 5; A quick shut-off operation can be secured.

As shown in FIG. 8-5, the lead portion of one lead conductor 1 can be bent along the end face of the housing through a step so that the height levels of the lead portions of both lead conductors are matched.
Z
The state after the operation of the samo protector shown in FIGS. 8-1 to 8-2 is substantially the same as the state shown in FIG. 1B or FIG. 5B, but the fusible material is melted. Or, the tip of the contact piece 2 released by softening enters under the riveting protrusion 4 of the lead conductor portion 1 housing piece 60 and reliably prevents recontact with the other lead conductor portion 10. There are features.

  Examples of the metal material used for the elastic contact piece 2 include phosphor bronze. When using resin as the contact piece, heat that uses FRP reinforced resin (thermoplastic resin or thermosetting resin) with fibers such as glass fiber, metal fiber, synthetic fiber, high-rigidity engineering plastic, etc. as soluble material The selection can be made in consideration of the relative relationship with the melting point of the plastic resin. 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 contact piece 2 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 contact piece 2 and the thermoplastic resin as the soluble material 3 include polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polybutylene terephthalate, polyphenylene oxide, polyethylene sulfide, and polysulfone. Engineering plastics such as engineering plastics, polyacetal, polycarbonate, polyphenylene sulfide, polyoxybenzoyl, polyether ether ketone, polyetherimide, etc., polypropylene, polyvinyl chloride, polyvinyl acetate, polymethyl methacrylate -To, polyvinylidene chloride, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, ethylene vinyl acetate copolymer (EVA), AS resin, ABS resin, iono -, it can be selected ones AAS resin, from in ACS resin of a predetermined melting point.
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 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 metal contact pieces in layers.

  For the lead 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 the basic composition 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. It is drawing which shows another example of the lead conductor with an elastic contact piece used for the thermo protector shown in FIG. It is drawing which shows an example different from the above of the lead conductor with an elastic contact piece used for the thermo protector shown in FIG. It is drawing which shows the fundamental structure different from the above of the thermoprotector which concerns on this invention. It is drawing which shows the mechanical state of the pillar of both-ends hinge support. It is drawing which shows another example of the lead conductor with an elastic contact piece used for 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 thermoprotector 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 thermoprotector 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 conventional thermo protector. It is drawing which shows the conventional thermo protector different from the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead conductor part 10 The other lead conductor part 2 Contact piece 21 One end part 22 of a contact piece The other end part 3 of a contact piece Soluble material 4 Riveting or welding place 5 Protective coating agent 6 Housing

Claims (8)

An elastic contact piece is fixed at both ends in a bent state holding elastic strain energy to one lead conductor portion of both lead conductor portions accommodated in the housing above and below each other. The other lead conductor portion is in contact with the contact piece in the bent state, and the contact portion is surrounded by a protective coat, so that the soluble material can be melted or A thermo protector characterized in that the elastic strain energy is released by softening and electrical conduction between both lead conductors is interrupted. The thermoprotector according to claim 1, wherein the protective coat is any one of oil, fats and oils, an organic solvent, a wax having a melting point lower than that of the soluble material, or a thermoplastic resin. The elastic contact piece is elastically deformed into a convex curve on the other lead conductor portion side, one end of the contact piece is folded back, and the folded portion is surface-bonded to one lead conductor portion via a soluble material. The thermoprotector according to claim 1, wherein the thermoprotector is provided. The thermoprotector according to any one of claims 1 to 3, wherein the soluble material is a low melting point metal. The fusible material at the surface joint between one end of the contact piece and one lead conductor is a thermoplastic resin, and the other end of the contact piece and one lead conductor are fixed under electrical continuity. The thermo protector according to claim 1, wherein the thermo protector is provided. 6. The thermoprotector according to claim 1, wherein the contact piece having elasticity is a metal or a polymer or a composite of a metal and a resin. The housing is divided into upper and lower parts, one lead conductor part to which an elastic contact piece is fixed is accommodated in one split housing part, and the other lead conductor part is contained in the other split housing part. The thermo protector according to claim 1, wherein the thermo protector is accommodated. The thermo-protector according to claim 7, wherein the upper and lower divided housing pieces are common.

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