JP2002343336A - Thermosensitive switch for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosensitive switch which can be attached to an electric cell side and can be assembled easily and is suitable for mass-production and with which an electric cell constitution at a low cost can be realized. SOLUTION: The switch is composed of a main body section 4a equipped with a breaking means and a terminal section T2 protruding from the main body section 4a. A through-hole 4p is arranged on the terminal section T2 through which a metal supporting rivet 7 inserted into a cell lid 2 can pass. With this constitution, electricity can be passed between the supporting rivet 7 and the terminal T2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal switch for a battery used for a rechargeable lithium ion secondary battery or the like of a mobile device such as a video camera, a notebook computer, and a portable telephone.

[0002]

2. Description of the Related Art Referring to the drawings, FIG. 11 is a front view of a battery in which a conventional thermal switch for a battery is used.

[0003] A conventional thermal switch 56 for a battery is used as a protection device to prevent fire or explosion of a battery B1 such as a secondary battery.

The battery cell 51 is formed of an aluminum casing and has a rectangular bottom wall 51a and a side wall 51b extending upward from the bottom wall 51a. In an interior 51c surrounded by the portion 51a and the side wall portion 51b, an electrode group (not shown) including a positive electrode plate, a negative electrode plate, a separator provided between the positive electrode plate and the negative electrode plate, and a lithium salt are provided. It is made of a material dissolved in an organic solvent, is immersed in an electrode group, and is injected with an electrolytic solution using the electrode group as a power generation element.

[0005] The battery lid 52 is made of an aluminum plate-like member 52.
a, and an electrode portion 52b protruding from the plate member 52a. The battery lid 52 is provided with an opening 51d of the battery cell 51.
, And is firmly fixed to the battery cell 51 by performing laser welding on the outer periphery, thereby sealing the inside 51c. The electrode portion 52 of the battery lid 52
b is connected to a negative electrode plate (not shown) and constitutes a negative electrode.

An Al-Ni clad material 53 made of an aluminum layer and a nickel layer is attached to the bottom wall portion 51a by welding or the like, and a lead wire 54 made of nickel is connected to the nickel layer and bent at a right angle. Side wall 51b
And extend in parallel.

The insulating sheet 55 has an elongated rectangular shape.
The lead wire 54 is attached to the side wall portion 51b by bonding or the like.
And the battery cell 51 are insulated. The thermal switch 56
When a predetermined temperature is reached, the switch is turned off to cut off the current. One terminal 56a is connected to the lead wire 54, and the other terminal 56b is connected to a lead 57 made of nickel. . And the cladding material 53
Is connected to a positive electrode plate (not shown),
Constitutes a positive electrode.

[0008]

The conventional battery lid is used for a lithium ion secondary battery in the manner described above. In the conventional secondary battery, a lead wire 54 is routed from a clad material 53. Since the configuration is such that the thermal switch 56 is connected, the steps are complicated, the assemblability and mass productivity are deteriorated, and the material cost is increased. Further, there is a problem that the resistance increases when the lead wire 54 is routed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a heat-sensitive switch having a structure in which the heat-sensitive switch can be mounted on the battery side, and which can form an inexpensive battery with good assemblability and mass productivity. The purpose is to do.

[0010]

As a first means for solving the above-mentioned problems, a thermal switch of the present invention comprises a main body having a shut-off means, and a terminal protruding from the main body, The terminal portion has a through hole through which a holding unit made of a metal material inserted into the battery lid can be inserted, so that the holding unit and the terminal unit can be electrically connected.

As a second means, the terminal portion of the thermal switch of the present invention has a connection terminal connected to the shut-off means, and a terminal piece connected to the connection terminal. And the terminal piece are made of nickel.

Further, as a third means, the thermal switch of the present invention includes a main body provided with a shut-off means, and a terminal protruding from the main body, and the terminal is formed of an aluminum material. In this configuration, a clad material having at least a weldable aluminum layer is formed on the battery side.

As a fourth means, the terminal portion of the thermal switch of the present invention is configured to face a battery cover formed of an aluminum material, and the clad material is weldable to the battery cover.

As a fifth means, the heat-sensitive switch of the present invention has a structure in which a projection for welding is formed on the aluminum layer so as to project toward the battery.

As a sixth means, the terminal portion of the thermal switch according to the present invention has a connection terminal connected to the shut-off means and a terminal piece connected to the connection terminal. Is composed of nickel, the terminal piece is formed of a clad material composed of a nickel layer, the layer exposed on the opposite side of the aluminum layer, the nickel layer is welded to the connection terminal, the connection terminal and The connection with the terminal piece was made.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings of the thermal switch of the present invention, FIG. 1 is a front view of a battery provided with the thermal switch of the present invention, and FIG. 2 is a battery lid unit using the thermal switch of the present invention. FIG. 3 is an exploded perspective view of a battery cover unit in which a thermal switch of the present invention is used according to a first embodiment U of the present invention, and FIG. FIG. 5 is a side view of the thermal switch, and FIG. 5 is a cross-sectional view of a main part of the thermal switch according to the present invention, showing a state where a terminal portion is attached.

As shown in FIG. 1, the thermal switch of the present invention is used as a part of a battery cover unit U used for sealing a battery cell 1 of an organic battery B such as a lithium ion secondary battery. First, a first embodiment of the battery B to which the thermally responsive switch of the present invention is attached and the battery lid unit U will be described.

The battery cell 1 is made of an aluminum casing and has a rectangular bottom wall 1a and a side wall 1b extending upward from the bottom wall 1a. Although not shown, a positive electrode plate, a negative electrode plate, an electrode group composed of a separator provided between the positive electrode plate and the negative electrode plate, and a lithium salt are provided in an interior 1c surrounded by the portion 1a and the side wall portion 1b. It is made of a material dissolved in an organic solvent, is immersed in an electrode group, and is injected with an electrolytic solution using the electrode group as a power generation element.

The battery lid 2 is made of an aluminum plate-like member 2a.
And a storage part 2b formed from the center to one end.
A safety valve 2c formed at the opposite end and formed by forming a metal thin film at the lower end of a through hole that passes vertically, and a first through hole 2d formed at the center. Having. The storage portion 2b includes a first concave portion 2e formed near the end portion, a second concave portion 2f further formed on the end side from the first concave portion 2e via a step, and a plate-like member 2a. And a concave portion 2g communicating with the first through hole 2d.

The insulating member 3 is made of PP (polypropylene),
A main body portion 3a formed of a synthetic resin molded product such as PPS (polyphenylene sulfide) and having an elongated rectangular shape and a rectangular rectangular hole 3b formed inside, and a lower portion from one end of the main body portion 3a. A first insulating portion 3c formed in a reverse convex shape, and an insulator 3d formed on the other end side and below the main body portion 3a and having a through hole 3e in the center. The first insulating portion 3c includes a guide portion 3f formed one step lower than the ends of the two frames in the longitudinal direction of the main body portion 3a, and a projection 3g projecting upward from the central portion of the guide portion 3f. Having.

The insulating member 3 is accommodated in the accommodating portion 2b of the plate member 2a, the first insulating portion 3c is accommodated in the second concave portion 2f, and the insulator 3d is accommodated in the concave portion 2g.
The positioning of the insulating member 3 is ensured. At this time, the first through hole 2d of the plate member 2a and the through hole 3e of the insulator 3d are in communication with each other, and the depth of the second recess 2f is the thickness of the first insulating portion 3c. Than, roughly equivalent,
Or, since it is designed to be large, the first insulating portion 3c
Does not travel from the second concave portion 2f, and the thickness of the battery cover unit U can be reduced. Furthermore, since the depth of the concave portion 2g is designed to be substantially equal to or larger than the thickness of the insulator 3d, the insulator 3d does not travel from the concave portion 2g, and the battery cover unit U The thickness can be reduced.

The thermal switch 4, which is a protection device, is connected to a rectangular main body 4a made of a synthetic resin molded article provided with a shut-off means (not shown) having a switch unit made of bimetal, and a cut-off means. First and second connection terminals 4b and 4c projecting from both sides of the main body, and first and second terminals which are welded at ends of the first and second connection terminals 4b and 4c and extend in opposite directions to each other. Pieces 4d and 4e. Also,
The first terminal piece 4d includes a base 4g having a through hole 4f formed therein.
And a bent piece 4h formed by being vertically bent from the end of the base 4g.

The first connection terminal 4b is made of nickel, and the first terminal piece 4d is made of nickel. The first connection terminal 4b and the first terminal piece 4d are The first terminal portion T1 is formed by welding such as ultrasonic welding or resistance welding. Note that the first connection terminal 4b and the first terminal piece 4d may be made of phosphor bronze. Further, a configuration in which nickel and phosphor bronze are combined and welded to each other may be used.

The second connection terminal 4c is made of nickel, and the second terminal portion 4e is made of an aluminum layer 4k and an Al-Ni clad material C having a nickel layer 4m. Is formed with a projection 4n (projection) for welding projecting downward. The second connection terminal 4c and the second terminal piece 4e are welded by ultrasonic welding, resistance welding, or the like to form a second terminal portion T2. The second connection terminal 4c may be made of phosphor bronze, and a phosphor bronze layer may be provided instead of the nickel layer 4m. Further, a combination of welding nickel and phosphor bronze may be used. Further, a brass layer or an iron layer may be provided instead of the nickel layer 4m. Further, the clad material C is not necessarily required to have two layers. When the temperature of the heat-sensitive switch 4 reaches a reference temperature, a switch unit serving as a cutoff unit is switched to an OFF state. There is a characteristic that the reference temperature is hardly changed even when the switching of the switch unit is repeatedly performed.

The thermal switch 4 having such a configuration is
It is inserted through the through hole of the insulating member 3 and housed in the first recess 2e. At this time, the thermal switch 4 is fixed to the insulating member 3 by inserting the through hole 4f of the first terminal piece 4d into the projection 3g of the first insulating portion 3c and caulking. Further, the base 4g of the first terminal 4d is guided by the guide 3f, so that the thermal switch 4 is securely fixed. Also,
Since the end of the bent piece 4h where the bending line X is located is located on the first insulating portion 3c, the insulation between the battery lid 2 and the first terminal portion T1 is reliably achieved.

The aluminum layer 4k of the second terminal piece 4e
Is opposed to the battery lid 2, and the second terminal strip 4 e and the battery lid 2 are welded by resistance welding to be electrically connected. Further, since the protruding portion 4n is formed on the aluminum layer 4k, electric power is concentrated during resistance welding, the protruding portion 4n is melted, and the second terminal piece 4e and the battery lid 2 are efficiently welded. Is performed. Needless to say, welding may be performed using ultrasonic welding or the like.

The waterproof sheet 5 is made of a thin sheet such as PP (polypropylene), PE (polyethylene), etc., has a cut 5a near the edge, and has an adhesive applied to the lower surface. Such a waterproof sheet 5 is adhered so as to cover the main body 4a of the thermal switch 4 in a state where the bent piece 4h is inserted through the cutout 5a.
Protect from water drops.

The gasket 6 is made of a molded product of a synthetic resin such as PP (polypropylene), PPS (polyphenylene sulfide) or the like, and has a thin plate-like base 6a and a cylindrical cylindrical portion protruding upward from the center of the base 6a. 6b from below the battery lid 2 with the first through-hole 2
d, the base 6a and the lower surface of the battery lid 2 are brought into close contact with each other through the through hole 3e.

The electrode part and the rivet 7 as a holding means are
A cylindrical portion 6 of a gasket 6 having a base 7a and a projection 7b
The protrusion 7b is inserted into the portion b. Also, the protrusion 7b
Is made of a thin plate having a through hole 8a, is also inserted into the through hole 8a of the metal plate 8 placed on the insulator 3d, the tip is caulked, and the insulating member 3 is fixed to the battery lid 2. ing.

As described above, the thermal switch of the present invention is used in the first embodiment U of the battery lid unit,
The battery cover unit U is attached to the battery cell 1 to constitute a battery B, and the battery cover 2 made of aluminum takes a minus sign, the second terminal piece 4e welded to the battery cover 2, and the present invention. The first terminal piece 4d forms a negative electrode via the thermal switch 4, and a rivet 7 is connected to a positive electrode plate (not shown) so that the rivet 7 functions as an electrode portion of the positive electrode. Earning.

Next, a description will be given of a method of manufacturing the battery B using the first embodiment U of the lid unit to which the thermal switch of the present invention is attached. First, the insulating member 3 is stored in the battery lid 2 in the storage section. Placed with the positioning in 2b,
The heat-sensitive switch 4 is inserted into the rectangular hole 3b and is housed in the first recess 2e.
Affix. In a state where the gasket 6, the battery cover 2, and the insulating member 3 are sandwiched, the rivet 7 is caulked to the metal plate 8, and each member is fixed to form the battery cover unit U.
Further, a casing of the battery cell 1 in which the electrode plate and the like are disposed in the inside 1c is formed, and the casing of the battery cell 1 and the battery lid unit U are dried. The reason for drying in this way is that lithium easily reacts with water. Then, the battery lid unit U is welded to the housing of the battery cell 1 by laser welding, and
Is sealed, and an electrolytic solution is injected from an inlet 1d formed in the side wall 1b to seal the inlet 1d. Thereafter, the electrolyte scattered at the time of injection is washed with water and dried, and the battery B is manufactured.

As described above, in the process of manufacturing the battery B, the battery lid 2 is exposed to the surrounding environment in which the electrolytic solution is scattered and the water at the time of washing is scattered. Since they are securely fixed, these parts do not shift due to water pressure or the like. Further, since the waterproof sheet 5 is attached so as to cover the thermal switch 4, there is no possibility that the thermal switch 4 gets wet. In addition, if each component is incorporated in the battery cover 2, the battery cover unit U can be manufactured.
Very simple.

Next, the drawing of the thermal switch of the present invention will be described. FIG. 6 is an exploded perspective view of a battery cover unit using the thermal switch of the present invention according to a second embodiment U1, and FIG. It is a principal part disassembled perspective view which shows the modification of the insulation part which concerns on the 2nd Embodiment U1 of the battery cover unit using the thermal switch of this invention.

The battery cover unit 2 of the second embodiment U1 in which the thermal switch of the present invention is used is the
Unlike the battery cover 2 of the embodiment U, the first embodiment is different from the first embodiment in that the housing is not formed. The first recess 2e and the second recess 2f are adjacent to each other, and the recess 2g corresponds to the plate-like member 2a. It is formed solely at the center. Further, instead of the insulating member 3 of the first embodiment U, an insulating sheet 9 as a first insulating portion and an insulator 10 are provided separately. The insulating sheet 9 as a first insulating portion is made of PP (polypropylene), PPS
(Polyphenylene sulfide) or the like is formed of an insulating sheet of a synthetic resin, and is housed and adhered in the second recess 2f.

The insulator 10 is made of PP (polypropylene),
Through-hole 1 formed in the center of a thin molded product of synthetic resin such as PPS (polyphenylene sulfide)
0a, and the insulator 10 is housed in the concave portion 2g. The other configuration is the same as the configuration of the first embodiment U of the battery lid unit in which the heat-sensitive switch of the present invention is used. As a modification of the insulating sheet 9, as shown in FIG. 7, an insulating guide 11 having a guide portion 11a may be used as a first insulating portion. The base 4g of the first terminal piece 4d of the thermal switch 4 is guided and positioned by the guide portion 11a. Alternatively, a protrusion may be provided from the guide portion 11a, and the base 4g may be crimped.

Although not shown, a storage recess is formed in the first recess 2e on the side facing the second recess 2f so as to be connected to the first recess 2e. The second terminal piece 4 is welded to a metal terminal made of an Al-Ni clad material so as to be laminated on the metal terminal.
The second connection terminal 4c from which e has been removed may be welded to house the second connection terminal 4c. At this time,
If the depth of the storage recess is substantially equal to or larger than the thickness of the second connection terminal 4c and the entire metal terminal, the thickness can be reduced. In addition, the metal terminal does not necessarily need to be a clad material, and may be formed of a normal metal plate depending on the material of the plate-like member 2a. The other parts are the same as those of the first embodiment U of the battery lid unit using the thermal switch of the present invention, and the same members are denoted by the same reference numerals and description thereof will be omitted.

Next, a description will be given of a third embodiment U2 of a battery cover unit using the thermal switch of the present invention. FIG. 8 shows a battery cover unit using the thermal switch of the present invention. FIG. 9 is a sectional view of a main part according to a third embodiment U2, and FIG. 9 is an exploded perspective view of a battery lid unit using the thermal switch of the present invention according to the third embodiment U2.

The third embodiment U2 of the battery cover unit using the heat-sensitive switch of the present invention has a second terminal piece 4e extending compared to the first embodiment U, and has an end portion. A second through hole 4p is formed in the vicinity. The second terminal piece 4e is not made of a clad material, but is made of only a nickel material. The battery cover plate 2 is
A third recess 2h is provided instead of the recess 2g.

The insulating member 12 is made of a synthetic resin such as PP (polypropylene), PPS (polyphenylene sulfide) or the like, and has a frame-like body that forms an elongated rectangular shape and has a rectangular hole 12b inside. Part 12
a, a first insulating portion 12c formed in a reverse convex shape downward from one end of the main body portion 12a, and an extending portion 12h formed in the center portion, and formed to extend to the other end side. It has a second insulator 12d and a third through hole 12e formed at the center of the second insulator 12d. Also, the first insulating part 1
2c has a guide portion 12f formed one step below the ends of the two frames in the longitudinal direction of the main body portion 12a, and a projection 12g projecting upward from the center of the guide portion 12f. That is, instead of the insulator 3d of the insulating member 3 used in the first embodiment U of the battery lid unit in which the heat-sensitive switch of the present invention is used, the insulating member 12 has an extension 12h.
Is formed, and a third through-hole 12e is formed in the second insulating portion 12d.

The insulating member 12 is used for the battery lid 2.
The storage member 2b of the plate-like member 2a
Is reliably positioned. At this time, as in the first embodiment U of the battery cover unit, the depth of the second recess 2f is designed to be substantially equal to or larger than the thickness of the first insulating portion 12c. In addition, the first insulating portion 12c does not travel from the second concave portion 2f, and the battery lid unit U2 can be made thin. Further, the third recess 2
h is also designed to be substantially equal or larger than the thickness of the second insulating portion 12d.
The insulating portion 12d does not travel from the third concave portion 2h, and the thickness of the battery cover unit U2 can be reduced.

The second terminal piece 4e of the second terminal portion T2 of the thermal switch 4, which is a protection device, extends toward the end, and has a second through hole 4p formed near the end. As described above, the second terminal piece 4e is made of only the nickel material. In addition, you may comprise from aluminum, phosphor bronze, iron, etc. Other parts of the heat-sensitive switch 4 are the same as those of the heat-sensitive switch 4 used in the first embodiment U of the battery cover unit, and the protrusions of the insulating member 12 housed in the battery cover 2 in the through holes 4f. 12g is inserted and swaged, and the first recess 2 is inserted through the rectangular hole 12b.
When the main body 4a is housed in e, the thermal switch 4 is securely fixed. When the thermal switch 4 is fixed in this manner, the first, second, and third through holes 2d, 4p, and 12e are provided.
Are in communication with each other.

The first, second and third through holes 2d, 4p and 12e communicating with each other are provided with a rivet 13 as a holding means via a gasket 6, and are riveted by the second terminal piece 4e. 13 is caulked. Then, the rivet 13 and the second terminal piece 4e are electrically connected, and the first terminal piece 4d forms an electrode. The material of the rivet 13 is made of iron (plated with nickel). In addition, you may comprise with aluminum, nickel, etc. Other aspects are the same as those of the first embodiment U of the battery lid unit, and thus the same members are given the same reference numerals and description thereof will be omitted. The material of the battery lid 2 is made of an aluminum material, but is not necessarily made of an aluminum material, and may be another metal such as nickel or iron (plated with nickel). That is, in the third embodiment U2 of the battery cover unit in which the thermal switch of the present invention is used, since the electrodes are taken out from the battery cells 1 and the battery cover 2 itself, the first terminal piece is used. 4d and the electrodes may be designed so that the electrodes of the battery cell 1 and the battery lid 2 are different. Incidentally, in the present embodiment, the first terminal piece 4d made of a nickel material constitutes a positive electrode, and the battery cell 1 and battery lid 2 made of an aluminum material constitute a negative electrode.

The battery cover units U, U1, and U2 in which the thermal switch of the present invention is used have the above-described configuration and are used as described above, but needless to say, the present invention is not limited to the above description. As a modified example, as shown in FIG. 10 which is a perspective view showing a modified example of the battery lid body according to the battery lid unit in which the thermal switch of the present invention is used, a protruding portion projecting upward from the plate-like member 2a. 2k may be formed along the outer periphery. The convex portion 2k projects beyond the thermal switch 4, and when the battery B falls, an impact force is first applied to the convex portion 2k, so that the thermal switch 4 is protected.

In the above description, the waterproof sheet 5 is used to prevent the thermal switch 4 of the present invention from getting wet. However, the waterproof switch 5 is coated with a sealant made of a viscous synthetic resin. May be planned. Also, in the above description, an example used for a lithium ion secondary battery has been described.
Needless to say, it can be used for any battery.

[0045]

According to the present invention, there is provided a thermal switch including a main body having a shut-off means, and a terminal protruding from the main body.
The terminal is formed with a through hole through which a holding means made of a metal material inserted into the battery lid can be inserted, so that the holding means and the terminal can be electrically connected, so that the terminal can be easily connected to the battery. Can provide a thermal switch that can
The assemblability is improved. Further, since it is not necessary to route the lead wires, a rise in resistance can be suppressed, and reliability can be improved.

The terminals of the thermal switch of the present invention are as follows:
Inexpensive, highly rust-proof heat-sensitive switch having a connection terminal connected to the blocking means, and a terminal piece connected to the connection terminal, wherein the connection terminal and the terminal piece are made of nickel. Can be provided.

The heat-sensitive switch of the present invention includes a main body having a shut-off means, and a terminal protruding from the main body. The terminal can be welded to a battery formed of aluminum material. Since a clad material having at least an aluminum layer is formed, a thermal switch that can be easily connected to any battery surface can be provided, and the mass productivity and assemblability of batteries can be improved. In addition, since it is not necessary to route the lead wires, an increase in resistance can be suppressed, and reliability can be improved.

The terminals of the thermal switch of the present invention are as follows:
The structure is such that the clad material is weldable to the battery lid, facing the battery lid made of an aluminum material, so that a thermal switch that can be easily connected to the battery lid can be provided, and the mass productivity and assemblability of batteries can be improved.

Further, since the welding layer is formed on the aluminum layer of the thermal switch of the present invention so as to project toward the battery, the thermal switch can be more reliably and quickly connected to the battery. Battery reliability and mass productivity are improved.

The terminal of the thermal switch of the present invention is
It has a connection terminal connected to the breaking means, and a terminal piece connected to the connection terminal, the connection terminal is made of nickel, and the terminal piece is a layer exposed on the opposite side of the aluminum layer from a nickel layer. Since the nickel layer is welded to the connection terminals and the connection between the connection terminals and the terminal pieces is made of a clad material, the heat switch can be provided at low cost and high rust prevention. it can.

[Brief description of the drawings]

FIG. 1 is a front view of a battery provided with a thermal switch of the present invention.

FIG. 2 is a sectional view of a main part according to a first embodiment U of a battery lid unit in which the thermal switch of the present invention is used.

FIG. 3 is an exploded perspective view of a battery cover unit using the thermal switch according to the first embodiment of the present invention.

FIG. 4 is a side view of the thermal switch of the present invention.

FIG. 5 is a cross-sectional view of a main part showing a state where a terminal portion of the thermal switch of the present invention is attached.

FIG. 6 is an exploded perspective view according to a second embodiment U1 of a battery cover unit in which the thermal switch of the present invention is used.

FIG. 7 is an exploded perspective view of a main part showing a modification of the insulating unit according to the second embodiment U1 of the battery lid unit using the thermal switch of the present invention.

FIG. 8 is a cross-sectional view of a main part of a battery lid unit according to a third embodiment U2 in which the thermal switch of the present invention is used.

FIG. 9 is an exploded perspective view of a battery cover unit using the thermal switch of the present invention according to a third embodiment U2.

FIG. 10 is a perspective view showing a modified example of the battery cover according to the battery cover unit in which the thermal switch of the present invention is used.

FIG. 11 is a front view of a battery in which a conventional battery thermal switch is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery cell 1a Bottom wall part 1b Side wall part 1c Inside 1d Inlet 2 Battery lid 2a Plate member 2b Storage part 2c Safety valve 2d First through hole 2e First concave part 2f Second concave part 2g Concave part 2h Third 3 Insulating member 3a Main body 3b Rectangular hole 3c First insulating part 3d Insulator 3e Through hole 3f Guide 3g Projection 4 Thermal switch (protection device) 4a Main body 4b First connection terminal 4c Second connection terminal 4d first terminal piece 4e second terminal piece 4f through hole 4g base 4h bent piece 4k aluminum layer 4m nickel layer 4n protrusion 4p second through hole 5 waterproof sheet 5a cutout 6 gasket 7 rivet (electrode part) 7a Base 7b Projection 8 Metal Plate 9 Insulation Sheet 10 Insulator 10a Through Hole 11 Insulation Guide 11a Guide 12 Insulation Member 12a Main Body 2b rectangular hole 12c first insulating portion 12d second insulating portion 12e third through hole 12f guide portion 12g protrusion 12h extension portion 13 rivet (holding means) B battery C clad material U battery cover unit U1 battery cover unit U2 Battery cover unit T1 First terminal part T2 Second terminal part

Claims (6)

[Claims] 1. A battery device comprising: a main body having a blocking means; and a terminal protruding from the main body. The terminal has a through hole through which a holding means made of a metal material inserted into a battery lid can be inserted. A thermal switch for a battery, wherein the thermal switch is formed so that the holding means and the terminal portion can be electrically connected. 2. The terminal section has a connection terminal connected to the blocking means, and a terminal piece connected to the connection terminal, wherein the connection terminal and the terminal piece are made of nickel. The thermal switch for a battery according to claim 1, wherein: 3. A cladding comprising a main body provided with a blocking means, and a terminal protruding from the main body, wherein the terminal has at least an aluminum layer formed of an aluminum material and weldable to a battery side. A heat-sensitive switch for a battery, wherein a material is formed. 4. The thermal switch for a battery according to claim 3, wherein the terminal portion is opposed to a battery cover formed of an aluminum material, and the clad material is weldable to the battery cover. 5. The heat-sensitive switch for a battery according to claim 3, wherein a projection for welding is formed on the aluminum layer so as to project toward the battery. 6. The terminal section has a connection terminal connected to the blocking means, and a terminal piece connected to the connection terminal, the connection terminal is made of nickel, and the terminal piece is made of aluminum. The layer exposed on the opposite side of the layer is formed of a clad material composed of a nickel layer, the nickel layer is welded to the connection terminal, and the connection between the connection terminal and the terminal piece is made. The heat-sensitive switch for a battery according to any one of claims 3 to 5, wherein