JPH11297174A - Safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple safe device whose assembly is easy by installing a bimetal which displaces a movable electrode so that the other end of the movable electrode is separated from a first fixed electrode when the temperature is increased to a first set value or higher, and other end of the movable electrode is brought into contact with the first fixed electrode when the temperature is decreased to less than the first set value. SOLUTION: When current flows from a second terminal part 32 to a first terminal part 12, current flows from a second fixed electrode 31 to a first fixed electrode 11 through a movable electrode 41 and a fixed contact. The movable electrode 41 is heated by its own resistant heating and the resistant heating of the first and second fixed electrodes 11, 31. Even if the temperature of the movable electrode 41 does not reach a first set temperature or more, a movable contact 45 continues the contact with a fixed contact 15. When the temperature of the movable electrode 41 reaches the first set temperature or more, the movable electrode 41 reversely turns on a second projection 3 as a fulcrum, and the movable contact 45 is separated from the fixed contact 15, the first and second fixed electrodes 11, 31 are applied to a positive characteristic thermistor to generate heat, the movable contact 45 is separated from the fixed contact 15, and current does not flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for protecting electric appliances and power supplies from short circuits, overloads, and the like.

[0002]

2. Description of the Related Art A power tool as an electric appliance is, for example, a power tool which can be used even in a place where commercial power is not available.
One secondary battery is connected to form one pack, and a secondary battery pack capable of obtaining a high voltage of 20 volts is used as a power supply. Such a secondary battery pack is provided with a safety device that protects the secondary battery from a short circuit, overcharge, overload, overheat, or the like.

FIG. 11 is a sectional view showing an example of the above-mentioned conventional safety device. In FIG. 11, S denotes a safety device, a safety device main body 71, a case 79 into which most of the safety device main body 71 is inserted, and a sealing resin 80 for sealing the safety device main body 71 in the case 79. It is composed of

The above-described safety device main body 71 has a resin-made support member 72 having an insulating property, and is integrally formed with the support member 72. One end is a first terminal portion 73a, and the other end is a fixed contact. 74, a first fixed electrode 73 whose upper surface is partially exposed at the center of the support member 72, a second terminal portion 75a at one end, and a support member 72 at the other end.
The second fixed electrode 75 fixed to the
A movable electrode 76 having a movable contact 77 disposed at one end thereof and having a movable contact 77 contacting and separating from a fixed contact 74 at one end (lower end); Is the first
A positive temperature coefficient thermistor 78 is provided so as to be clamped to the fixed electrode 73 and to be clamped while the other end (upper end) is crimped to the movable electrode 76.

[0005] The case 79 has a rectangular tube shape with one end opened and the other end closed, and is formed of a resin having an insulating property. Further, the sealing resin 80 is an insulating resin such as an epoxy resin, and has first and second terminal portions 73a and 75a.
The safety device main body 71 inserted into the case 79 with the protruding portion is fixed and sealed in the case 79. The movable electrode 76 is made of a bimetal.

Next, the assembly will be described. First, the positive temperature coefficient thermistor 78 is placed on the support member 72, and the lower end thereof is brought into contact with the first fixed electrode 73. Then, the movable contact 77 comes into contact with the fixed contact 74, and the upper end of the positive temperature coefficient thermistor 78 is contacted. The movable electrode 76 is placed on the support member 72, and the second fixed electrode 75 is also placed in contact with the movable electrode 76. Then, the second fixed electrode 75, the movable electrode 76, and the positive temperature coefficient thermistor 78 are fixed to the support member 72 by melting and deforming a part of the support member 72, as shown in FIG. Assemble 71.

Next, the safety device main body 71 assembled as described above is inserted into the case 79 from the fixed contact 74 and the movable contact 77 side, and as shown in FIG. 11, the first and second terminal portions 73a, 75a. Is made to protrude from the case 79. Then, the sealing resin 80 is injected into the space behind the support member 72 from the open end of the case 79, cured, and sealed, whereby the assembly of the safety device S is completed.

[0008]

As described above, in the conventional safety device S, first, after assembling the safety device main body 71, the first and second terminal portions 73 of the safety device main body 71 are assembled.
Since most of the parts a and 75a are inserted into the case 79 and assembled by sealing with the sealing resin 80, the assembly is complicated and the assembling work is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned inconvenience, and it is an object of the present invention to provide a safety device which can be easily assembled and can be easily assembled.

[0010]

A safety device according to the present invention comprises a first base made of resin, and a first base integrally formed with one end protruding outside the first base as a first terminal. A first fixed electrode that is molded and partially exposed in the first base; a second resin base that is welded to the first base so as to cover an open portion of the first base; One end portion is projected as a second terminal portion, and one end side is sandwiched between the second fixed electrode integrally formed and held on the second base in a state facing the first base and the first base and the second fixed electrode. A movable electrode, the other end of which is in contact with and separated from the first fixed electrode exposed in the first base, and one end of the movable electrode is sandwiched between the movable electrode and the first base; When the temperature becomes equal to or higher than the first set temperature, the other end of the movable electrode is separated from the first fixed electrode. The movable electrode is displaced in Suyo, first
And a bimetal for bringing the other end of the movable electrode into contact with the first fixed electrode when the temperature is lower than the set temperature.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a safety device according to a first embodiment of the present invention, FIG. 2 is a plan view of a first base shown in FIG. 1, and FIGS. 1 is a cross-sectional view along line AA of the base, a cross-sectional view along line BB,
4 is a cross-sectional view taken along the line CC, a cross-sectional view taken along the line DD, and a right side view. FIG. 4 is a plan view of the second base shown in FIG. 1, and FIGS. 5 (a) to 5 (c) are shown in FIG. FIG. 8 is a cross-sectional view of the second base taken along line EE, a cross-sectional view taken along line FF, and a cross-sectional view taken along line GG.

FIG. 6 is a sectional view of the safety device in which the components shown in FIG. 1 are assembled, and FIG. 7 is an operation explanatory diagram of the safety device shown in FIG. It should be noted that the second base and the movable electrode shown in FIG. 1 are shown in an upside down state. FIG. 6 shows a normal state in which the circuit is closed, and FIG. 7 shows an abnormal state in which the circuit is opened.

In FIG. 1 to FIG. 7, reference numeral 1 denotes a first base having a rectangular planar shape, which is formed of a resin having an insulating property and is opened upward, and a first recess 2 and a second recess 3 are provided. A ridge 4 orbiting around the periphery and a columnar projection 5 for positioning two each on the short side of the upper surface
Are provided. The first base 1 is shown in FIG.
As shown in (a) to (e), both corners corresponding to the long sides of the lower surface are formed in an arc shape so that they can be in close contact with the peripheral surface of the columnar secondary battery. A part of the protrusion 4 between the protrusions 5 on one short side is cut out so that a part of a movable electrode 41 described later can be protruded.

Reference numeral 11 denotes a first base integrally formed with the first base 1.
A fixed electrode is shown. One end protrudes from one short side of the first base 1 in parallel with the long side to form a first terminal portion 12, and the other end is the other short side of the first base 1. And the third terminal portion 13 protruding in parallel with the long side. And
A portion of the first base 1 is exposed to the first and second recesses 2 and 3, and the portion exposed to the second recess 3 is directed upward to ensure electrical contact with a positive temperature coefficient thermistor 61 described later. A plurality of protruding arc-shaped protrusions 14 are formed, and a fixed contact 15 is provided at a portion exposed to the first recess 2.

Reference numeral 21 denotes a second base having a rectangular planar shape, which is formed of an insulating resin and is welded so as to cover the open upper surface of the first base 1, and the first base is provided on the lower surface. 1 is provided with a recess 22 in which the protrusion 5 is fitted.
Are provided respectively.

Reference numeral 31 denotes a second fixed electrode integrally formed and held on the second base 21. One end of the second fixed electrode is connected to the second base 21.
The second terminal portion 32 is formed by protruding from one of the short sides in parallel with the long side. A hole 23 of the second base 21 is provided at a position corresponding to each of the protrusions 5 on one short side of the first base 1.
Each of the holes 33 is provided with a hole extending through the peripheral edge thereof, and an arc-shaped convex portion 34 protruding downward and in contact with the movable electrode 41 is formed at the other end.

Reference numeral 41 denotes a movable electrode made of a bimetal, which is displaced, inverted, and returns from the first set temperature when the temperature is raised to a first set temperature higher than the normal temperature which is also the displacement temperature or the inversion temperature, for example, 80 ° C. When the temperature is lowered to a second set temperature, for example, 30 ° C., the original state is restored. A hole 4 into which the projection 5 fits and penetrates at one end corresponding to each projection 5 on one short side of the first base 1.
2 are provided at respective positions corresponding to the second concave portions 3, that is, at positions corresponding to the positive characteristic thermistors 61, so as to protrude downward to secure electrical contact with the positive characteristic thermistors 61. A movable contact 45 is provided at a position of the other end corresponding to the fixed contact 15 so as to be in contact with and separate from the fixed contact 15.

Reference numeral 61 denotes a positive temperature coefficient thermistor for maintaining the movable electrode 41 in a displaced state by self-heating due to energization.

As described above, the safety device S of the first embodiment is described.
Are a first base 1, a first fixed electrode 11 integrally formed with the first base 1, a second base 21, a second fixed electrode 31 integrally formed with the second base 21, and a movable electrode 41, a positive temperature coefficient thermistor 61, that is, one component including the first base 1 and the first fixed electrode 11,
One component consisting of the base 21 and the second fixed electrode 31;
It is composed of four parts, a movable electrode 41 and a positive temperature coefficient thermistor 61.

Next, the assembly will be described. First, the first
The PTC thermistor 61 is inserted into the second concave portion 3 of the base 1 from above, and the lower end thereof is brought into contact with the first fixed electrode 11. Then, the protrusion 5 penetrates through the hole 42 of the movable electrode 41, and the movable electrode 4 contacts the movable contact 45 with the fixed contact 15.
1 is placed, and the protrusion 43 is brought into contact with the upper end of the positive temperature coefficient thermistor 61.

Next, the second base 21 is placed on the first base 1 so that the upper end of the first base 1 is inserted into the recess 22.
Each projection 5 is fitted into the hole 23. And the first base 1
When the first base 1 and the second base 21 are welded by ultrasonic welding, the ridges 4, the projections 5, and the contact surfaces of the first base 1 and the second base 21 are welded. Can be assembled.

Next, the operation will be described. First, for example, when a current normally flows from the second terminal portion 32 to the first terminal portion 12, the second fixed electrode 31 moves to the movable electrode 41,
First fixed electrode 11 via movable contact 45 and fixed contact 15
Current flows to maintain the state shown in FIG. When the current flows in this manner, the movable electrode 41 is heated by its own resistance heating, and is also heated by the resistance heating of the first and second fixed electrodes 11 and 31, and the first and second fixed electrodes 11 and 31 are heated.
It is also heated by the ambient temperature via the bases 1, 21.

In this state, if the temperature of the movable electrode 41 does not exceed the first set temperature, the state shown in FIG.
The movable contact 45 remains in contact with the fixed contact 15. When the movable contact 45 contacts the fixed contact 15, the second fixed electrode 3 is connected via the movable contact 45 and the fixed contact 15.
Since the current flows from 1 to the first fixed electrode 11 in a short-circuit state, substantially no current flows through the PTC thermistor 61, and the PTC thermistor 61 hardly generates heat.

However, an overcurrent flows due to a short circuit or the like,
Second fixed electrode 31, movable electrode 41 and first fixed electrode 1
When the temperature of the movable electrode 41 becomes equal to or higher than the first set temperature, the movable electrode 41 is displaced and inverted with the convex portion 43 as a fulcrum, thereby fixing the movable contact 45 as shown in FIG. Move away from the contact 15. When the movable contact 45 separates from the fixed contact 15 in this manner, the voltage between the electrodes 31 and 11 is applied to the positive characteristic thermistor 61 and the positive characteristic thermistor 61 generates heat, so that the movable contact 45 separates from the fixed contact 15. And the current stops flowing.

When the movable electrode 45 is returned from the state where the movable contact 45 is separated from the fixed contact 15 by the heat generated by the positive temperature coefficient thermistor 61, the first terminal portion 12 and / or the second terminal portion 32 are disconnected from the power supply. If the temperature of the movable electrode 41 is lowered below the second set temperature by disconnecting, reducing the load, or cooling the safety device S, the movable electrode 41 returns, and the movable contact 45 becomes the fixed contact 15. Contact. When a current flows from the second terminal portion 32 to the third terminal portion 13, when a current flows from the first terminal portion 12 to the second terminal portion 32, and further, when the current flows from the third terminal portion 13 to the second terminal portion 32. The same operation is performed when a current flows.

Further, as shown by a two-dot chain line in FIGS. 6 and 7, the second fixed electrode 31 is also parallel to the long side from the other short side of the second base 21 like the first fixed electrode 11. A protruding fourth terminal portion 35 is provided to allow a current to flow from the fourth terminal portion 35 to the first terminal portion 12, a current to flow from the fourth terminal portion 35 to the third terminal portion 13, or a A current may flow to the fourth terminal 35, or a current may flow from the third terminal 13 to the fourth terminal 35. Then, if the terminal portion that is not used or used is cut from the root, an accident such as a short circuit can be prevented.

As described above, according to the first embodiment of the present invention, the positive characteristic thermistor 6 is connected to the first base 1.
1. The movable electrode 41 and the second base 21 are sequentially placed and the first
By welding the base 1 and the second base 21, the safety device S can be assembled, so that the assembly is easy and the assembly work is also simplified. The positioning means for positioning the positive temperature coefficient thermistor 61 with respect to the first base 1 is constituted by the second concave portion 3, and the movable electrode 41, the second base 21, and the second base 21 are positioned with respect to the first base 1. Since the positioning means is constituted by the projections 5, the holes 42 and the holes 23, the positioning can be simplified, the assembly is further facilitated, and the assembling work is also simplified.

The second temperature, which is the return temperature of the movable electrode 41,
Since the set temperature is lower than the first set temperature, which is the displacement and inversion temperature, and the temperature difference is increased, chattering can be prevented. Further, the first terminal section 12 and the third terminal section 13 are located on opposite sides, the second terminal section 32 and the fourth terminal section 35 are located on opposite sides.
Since the second terminal portion 32 and the second terminal portion 32 are oriented in the same direction, the terminal portion can be selected according to the mounting position without bending the terminal portion and reversing the direction, which is convenient. Furthermore, since the positive temperature coefficient thermistor 61 is provided, it can be a self-holding type, and safety can be improved.

FIG. 8 is a sectional view of a safety device according to a second embodiment of the present invention, and FIG. 9 is an explanatory diagram of the operation of the safety device shown in FIG. 8, which is the same as or equivalent to FIGS. The description is omitted by attaching reference numerals. 8 and 9, 4
Reference numeral 1A denotes a movable electrode, and similarly to the above-described movable electrode 41, holes 42 through which the projections 5 fit and penetrate are provided at positions corresponding to the respective projections 5 on one short side of the first base 1. A movable contact 45 that comes into contact with and separates from the fixed contact 15 is provided at a position of the other end corresponding to the fixed contact 15.

Reference numeral 51 denotes a bimetal, which is displaced and inverted when the temperature is raised to a first set temperature higher than room temperature, for example, 80 ° C., which is also a displacement temperature or an inversion temperature, and is a second set temperature which is a return temperature from the first set temperature. When the temperature is lowered to, for example, 30 ° C., the state returns to the original state. A hole (52) through which the projection 5 fits and penetrates at one end corresponding to each projection 5 on one short side of the first base 1 (not shown).
Are provided at positions corresponding to the second concave portions 3, that is, positions corresponding to the positive characteristic thermistors 61. Are formed.

When assembling the safety device S of the second embodiment, similarly to the case of assembling the safety device S of the first embodiment, the positive characteristic thermistor 6 is attached to the first base 1.
1, bimetal 51, movable electrode 41A, second base 21
Are sequentially mounted and the first base 1 and the second base 21 are welded to each other to be assembled. The operation of the safety device S of the second embodiment is the same as that of the first embodiment, although the movable electrode 41 of the first embodiment is composed of two parts, the movable electrode 41A and the bimetal 51. Description is omitted.

In the safety device S of the second embodiment, although the number of parts is increased by one compared to the first embodiment, the safety device S
The same effect as in the embodiment can be obtained. In addition, the movable electrode 41, the movable electrode 41A, and the bimetal 51 are set to 0.1.
Since the thickness is as thin as 1 mm, different types of safety devices S can be manufactured by adjusting the welding allowance for the first base 1 and the second base 21 used in the first embodiment.

FIG. 10 is an explanatory view of a secondary battery pack using the safety device shown in FIGS. 1 to 9. The same or corresponding parts as in FIGS. .
In FIG. 10, P indicates a secondary battery pack, for example, a secondary battery B in which a plurality of batteries are arranged in two rows, and a secondary battery B
Of the first base 1 against the peripheral surface of the secondary battery B
, And a heat-shrinkable covering C that exposes necessary parts to cover the secondary battery B and the safety device S. In addition, the safety device S is provided with any one of the first to fourth terminal portions 12, 13, 32, and 35.
It is connected in series with B to the secondary battery using a lead wire or the like.

As described above, since both corners corresponding to the long sides of the first base 1 of the safety device S are arcuate surfaces along the peripheral surface of the secondary battery B, the space in which the secondary batteries B are juxtaposed is effectively used. The safety device S can be disposed using the secondary battery pack P
Can be miniaturized.

In each of the above embodiments, the self-holding type using the positive temperature coefficient thermistor 61 has been described, but the self temperature holding type thermistor 61 may not be used. Further, the first set temperature of the movable electrode 41 and the bimetal 51 is set to 80 ° C., and the second set temperature is set to 30 ° C. However, the first set temperature and the second set temperature may be set to the same temperature or the first set temperature may be set. May be made higher or the second set temperature may be made lower.

[0036]

As described above, according to the safety device of the present invention, the positive characteristic thermistor, the bimetal, the movable electrode, and the second base are sequentially placed on the first base, or the positive characteristic thermistor and the bimetal are placed on the first base. Movable electrode having function, second
A base is sequentially placed, or a bimetal, a movable electrode, and a second base are placed sequentially, or a movable electrode having a bimetal function and a second base are placed sequentially, and a first base and a second base are welded. By doing so, the safety device can be assembled, so that the assembly is easy and the assembly work is also simple.

Since the second set temperature which is the return temperature of the bimetal or the movable electrode having the function of the bimetal is set lower than the first set temperature which is the displacement and inversion temperature, chattering can be prevented. . Also, the first
Since the third terminal portion was provided on the opposite side of the terminal portion, the fourth terminal portion was provided on the opposite side of the second terminal portion, and the first terminal portion and the second terminal portion were oriented in the same direction, The terminal portion can be selected according to the mounting position without bending the terminal portion and reversing the direction, so that it is easy to use.

Further, since the positive temperature coefficient thermistor is provided, the self-holding type can be provided, and safety can be improved. Further, since the positioning means for positioning the bimetal, the movable electrode, or the movable electrode having the function of the bimetal with respect to the first base is provided, the positioning can be simplified, the assembling is further facilitated, and the assembling work is also simplified. Become. In addition, since both corners of the first base, which are located on the opposite side to the welding surface and are parallel to the first terminal portion, are arcuate surfaces, it is possible to effectively utilize the space in which the secondary batteries are juxtaposed. Thus, the size of the secondary battery pack can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a safety device according to a first embodiment of the present invention.

FIG. 2 is a plan view of a first base shown in FIG.

3 (a) to 3 (e) show the first base A shown in FIG. 2;
It is sectional drawing by the -A line, sectional drawing by the BB line, sectional drawing by the CC line, sectional drawing by the DD line, and right side view.

FIG. 4 is a plan view of a second base shown in FIG. 1;

5 (a) to 5 (c) show the second base E shown in FIG.
-E-section, FF-section, and G
It is sectional drawing by the -G line.

FIG. 6 is a sectional view of the safety device in which the components shown in FIG. 1 are assembled.

FIG. 7 is an operation explanatory diagram of the safety device shown in FIG. 6;

FIG. 8 is a sectional view of a safety device according to a second embodiment of the present invention.

FIG. 9 is an operation explanatory view of the safety device shown in FIG. 8;

FIG. 10 is an explanatory view showing an attached state of the safety device shown in FIGS. 6 to 9;

FIG. 11 is a sectional view showing an example of a conventional safety device.

[Explanation of symbols]

 S Safety device 1 First base 2 First concave portion 3 Second concave portion 4 Ridge 5 Projection 11 First fixed electrode 12 First terminal portion 13 Third terminal portion 14 Convex portion 15 Fixed contact 21 Second base 22 Recess 23 Hole 31 2nd fixed electrode 32 2nd terminal part 33 hole 34 convex part 35 4th terminal part 41, 41A movable electrode 42 hole 43 convex part 45 movable contact 51 bimetal 61 positive characteristic thermistor P secondary battery pack B secondary battery C covering

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[Procedure amendment]

[Submission date] April 6, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] Next, a safety device body 71 assembled as described above is inserted from the fixed contact 74 and the movable contact 77 side into the case 79, as shown in FIG. 11, the first and second terminal portions 73a, 75a Is made to protrude from the case 79. Then, the sealing resin 80 is injected into the space behind the support member 72 from the open end of the case 79, cured, and sealed, whereby the assembly of the safety device S is completed.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

A safety device according to the present invention comprises a first base made of resin, and a first base integrally formed with one end protruding outside the first base as a first terminal. A first fixed electrode that is molded and partially exposed in the first base; a second resin base that is welded to the first base so as to cover an open portion of the first base; A second fixed electrode integrally formed and held on the second base in a state in which one end protrudes as a second terminal portion and faces the first fixed electrode; a first base and a second fixed electrode. It is arranged between the, and toward or away from the movable electrode with respect to the first fixed electrode and the other end side is exposed in the first base is disposed between the movable electrode and the first base, first set When the temperature is equal to or higher than the temperature, the movable electrode is displaced so that the other end of the movable electrode is separated from the first fixed electrode, If less than 1 set temperature, in which and a bimetal contacting the other end of the movable electrode into the first fixed electrode.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

Reference numeral 11 denotes a first base integrally formed with the first base 1.
A fixed electrode is shown. One end protrudes from one short side of the first base 1 in parallel with the long side to form a first terminal portion 12, and the other end is the other short side of the first base 1. And the third terminal portion 13 protruding in parallel with the long side. And
A part of the first fixed electrode 11 is exposed to the first and second recesses 2 and 3, and a part of the first fixed electrode 11 is exposed to the upper side to secure electrical contact with a positive temperature coefficient thermistor 61 described later. A plurality of arc-shaped protrusions 14 are formed, and a fixed contact 15 is provided at a portion exposed to the first recess 2.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Reference numeral 31 denotes a second fixed electrode integrally formed and held on the second base 21. One end of the second fixed electrode is connected to the second base 21.
The second terminal portion 32 is formed by protruding from one of the short sides in parallel with the long side. A hole 23 is provided at a position corresponding to each of the protrusions 5 on one short side of the first base 1, and an arc-shaped convex portion protruding downward contacting the movable electrode 41 is provided at the other end. 34 are formed.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

Next, the second base 21 is placed on the first base 1 so that the upper end of the first base 1 is inserted into the recess 22.
Each protrusion 5 is fitted into hole 23 and works with second fixed electrode 31
Ru contacting the electrode 41. And the first base 1 and the second
When the base 21 is welded by ultrasonic welding, the ridges 4, the protrusions 5, and the contact surfaces of the first base 1 and the second base 21 are welded. As shown in FIG. 6, the safety device S is assembled. Can be.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

However, an overcurrent flows due to a short circuit or the like,
Second fixed electrode 31, movable electrode 41 and first fixed electrode 1
When the temperature of the movable electrode 41 becomes equal to or higher than the first set temperature, the second recess 3 is fixed as shown in FIG.
When the movable electrode 41 is displaced and inverted with the edge on the contact 15 side as a fulcrum, the movable contact 45 is separated from the fixed contact 15. When the movable contact 45 separates from the fixed contact 15 in this way, the voltage between the electrodes 31 and 11 becomes positive thermistor 61
, And the positive temperature coefficient thermistor 61 generates heat, so that the movable contact 45 maintains a state separated from the fixed contact 15 and no current flows.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

In the safety device S of the second embodiment, although the number of parts is increased by one compared to the first embodiment, the safety device S
The same effect as in the embodiment can be obtained. Since the movable electrode 41, 41A and the bimetal 51 is 0.1mm and thin, by adjusting the squeeze to weld the first base 1 and the second base 21, different types of first real
The safety device S of the embodiment and the safety device S of the second embodiment are the same.
It can be as thick as

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

[0037] Also, or providing the third terminal portion opposite the first terminal portion, in <br/> of providing the fourth terminal portion on the opposite side of the second terminal unit, direction by bending the terminal portions The terminal can be selected according to the mounting position without inverting the terminal, so that it is easy to use.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

Further, since the positive temperature coefficient thermistor is provided, the self-holding type can be provided, and safety can be improved. Further, since the positioning means for positioning the bimetal, the movable electrode, or the movable electrode having the function of the bimetal with respect to the first base is provided, the positioning can be simplified, the assembling is further facilitated, and the assembling work is also simplified. Become. Further, since the both corners you parallel to the first terminal portion is positioned on the opposite side of the weld surface and the circular arc surface, can be disposed by effectively utilizing the space juxtaposed the secondary battery, a secondary The size of the secondary battery pack can be reduced.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] S Safety device 1 First base 2 First recess 3 Second recess 4 Ridge 5 Protrusion 11 First fixed electrode 12 First terminal 13 Third terminal 14 Convex 15 Fixed contact 21 Second base 22 concave portion 23 hole 31 second fixed electrode 32 second terminal portion 34 convex portion 35 fourth terminal portion 41, 41A movable electrode 42 hole 43 convex portion 45 movable contact 51 bimetal 61 positive temperature coefficient thermistor P secondary battery pack B secondary battery C coating

[Procedure amendment 12]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (11)

[Claims] A first base made of resin; and a first base integrally formed with the first base with one end protruding outside the first base as a first terminal, and a part of the first base. A first fixed electrode from which the first base is exposed; a second base made of resin that is welded to the first base so as to cover an open part of the first base; A second fixed electrode integrally formed and held on the second base in a state facing the first base; and a state in which one end is sandwiched between the first base and the second fixed electrode. A movable electrode, the other end of which is in contact with and separated from the first fixed electrode exposed in the first base; and a movable electrode disposed between the movable electrode and the first base with one end sandwiched between the movable electrode and the first base. When the temperature exceeds one set temperature, the other end of the movable electrode is moved to the first Displacing the movable electrode and away from the constant electrode, the safety device comprising goes below the first set temperature, the bimetal to contact the other end of the movable electrode into the first fixed electrode. 2. The safety device according to claim 1, wherein when the temperature of the bimetal drops below a second set temperature lower than the first set temperature, the other end of the movable electrode is connected to the first fixed electrode. A safety device characterized by contacting. 3. The safety device according to claim 1, wherein the first fixed electrode has the other end protruding as a third terminal toward the side opposite to the first terminal. Features safety device. 4. The safety device according to claim 1, wherein the first terminal portion and the second terminal portion extend in the same direction. Safety device. 5. The safety device according to claim 4, wherein the second fixed electrode has the other end protruding as a fourth terminal to a side opposite to the second terminal. apparatus. 6. The safety device according to claim 4, wherein a planar shape of the first base and the second base is rectangular, and the first base and the second base are located on a side opposite to a welding surface and are in contact with the first terminal portion. A safety device, wherein both corners of the first base in parallel are arc surfaces. 7. The safety device according to claim 1, wherein one end of the safety device is crimped to the first fixed electrode, and the second fixed electrode is
A safety device characterized in that a positive temperature coefficient thermistor whose other end is crimped to one of the movable electrode and the bimetal is provided. 8. The safety device according to claim 1, wherein at least the bimetal is attached to the first base before the first base and the second base are welded to each other. And a positioning device for positioning the movable electrode. 9. The safety device according to claim 1, wherein the movable electrode has the function of the bimetal and is made into a single part. 10. The safety device according to claim 9, further comprising: a positive temperature coefficient thermistor having one end crimped to the first fixed electrode and the other end crimped to the second fixed electrode or the movable electrode. A safety device characterized by the following. 11. The positioning device according to claim 9, wherein at least the bimetal is positioned with respect to the first base before welding the first base and the second base. A safety device characterized by comprising: