JP2000113784A - Manufacture of thin temperature fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuse easily having good sealing ability by fusing a resin cover film with a periphery surrounding a fusable alloy piece with flux coating low melting point of a resin base film, and sealing this fusible alloy piece with low melting point alloy. SOLUTION: A long resin cover film 120 extending orthogonally to the longitudinal direction of a lead conductor 2 of a temperature fuse body A is placed on a resin base film 11, and positioning of the cover film 120 in relation to the longitudinal direction is performed by a positioning jig. A heating die D having a recessed part (c) for accommodating a fusible alloy piece (a) with flux coating low melting point is dropped, the cover film 120 is thermally fused with a periphery surrounding the fusible alloy piece (a) with flux coating low melting point on the base film 11. The heating die D is provided with a Thomson blade for cutting the cover film 120 at the both edges of the width of the base film 11, and the blade cuts the cover film 120 at thermally fusing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin temperature fuse.

[0002]

2. Description of the Related Art In an alloy type temperature fuse, a fuse element of a low melting point fusible alloy is blown off by heat generated due to an overcurrent of the device to cut off the power supply to the device, thereby causing abnormal heat generation of the device and a fire. Is prevented beforehand. In recent years, as personal electronic devices such as mobile phones, notebook PCs, and video cameras have become smaller and thinner, secondary batteries (lithium-ion batteries, nickel-metal hydride batteries, etc.) as power sources have also become smaller. Have been.

In this lithium ion secondary battery or the like, since the energy density is high and a considerably large current flows during discharging or charging and the temperature may rise, an alloy-type temperature hue is formed on the bottom or side surface of the secondary battery. It has been considered to dispose a heater to prevent the temperature from rising. This alloy-type temperature fuse is required to be thin in order to reduce the size of the battery, and the applicant of the present invention has described such a thin temperature fuse as "a pair of leads on a resin base film." Each tip of the conductor is exposed from the back surface to the front surface, a low-melting-point fusible alloy piece is connected between the exposed portions, and a flux is applied to the low-melting-point fusible alloy piece to form a resin cover film. An alloy-type temperature fuse fused to the periphery of the flux-coated low melting point fusible alloy piece with a resin base film "has already been proposed (Japanese Patent Publication No. 7-95419).

[0004]

In the alloy type temperature fuse, an oxide film inevitably formed on the surface of the low melting point fusible alloy piece is melted by activating the flux during the operation of the temperature fuse. As a result, the spheroidization of the molten alloy is promoted. Therefore, in sealing the thin temperature fuse with the resin cover film, the resin cover film is formed in a container shape in advance so as to eliminate the exposure of the low melting point fusible alloy piece due to the pressure deformation of the flux. To prevent excessive stress from acting on the flux.

However, when such a molded resin cover film is used, strict alignment with the flux-coated low-melting-point fusible alloy piece is required so that the flux-coated low-melting-point fusible alloy piece is accommodated in the space in the resin cover film. This leads to a decrease in manufacturing efficiency and an increase in cost of manufacturing equipment. On the other hand, under the rough alignment, the flux is stuck in the sealing interface, and a predetermined sealing property cannot be ensured, so that a reduction in product yield cannot be avoided.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thin resin sealing film for a flux-coated low-melting fusible alloy piece by fusing the resin cover film to a peripheral portion of the resin-based film surrounding the flux-coated low-melting fusible alloy piece. It is an object of the present invention to provide a method of manufacturing a thin temperature fuse that can easily produce a temperature fuse with excellent sealing properties.

[0007]

According to one aspect of the present invention, there is provided a method of manufacturing a thin temperature fuse, in which a resin base film exposes the respective tips of a pair of lead conductors from the back surface to the front surface. A low melting point fusible alloy piece is connected between the exposed portions, a temperature fuse body is formed by applying a flux to the low melting point fusible alloy piece, and the entire length of the flux coated low melting point fusible alloy piece is stored. A long resin cover film formed with a continuous groove having a width to be obtained is disposed on the resin base film of the temperature fuse body,
A long resin cover film is fused to the resin base film at a peripheral portion surrounding the flux-coated low melting point fusible alloy piece on the resin base film.

In another method for manufacturing a thin temperature fuse according to the present invention, a low melting point fusible alloy piece is connected between tips of a pair of lead conductors, and a flux is applied to the low melting point fusible alloy piece. A method for producing a temperature fuse in which the flux-coated low-melting-point fusible alloy piece is sealed by fusing a peripheral portion between a resin base film and a resin cover film.
A long resin base film and a long resin cover film extending in a direction orthogonal to the longitudinal direction of the lead conductor with the flux-coated low melting point fusible alloy piece interposed between the lead conductors;
At least one of the two long films is formed with a continuous groove having a width that can accommodate the entire length of the flux-coated low-melting fusible alloy piece, and these two long films are coated with the flux-coated low-melting fusible alloy piece. This is a configuration characterized by being fused at a surrounding portion and cut at a predetermined width.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show an example of a thin temperature fuse manufactured by the method according to the first aspect. In FIG. 1, reference numeral 11 denotes a resin base film, and a pair of strip-shaped lead conductors 2, 2 arranged on the same straight line.
The front end portions 20 are exposed from the back surface of the film to the front surface, and are fixed by fusion or an adhesive. Reference numeral 3 denotes a low-melting-point fusible alloy piece as a fuse element.
The flux 4 is applied between the exposed ends 20, 20 of the conductors. 12 is a resin cover film,
The peripheral portion is sealed to the resin base film 11 by heat fusion or ultrasonic welding.

FIG. 2A shows an example of a long resin cover film 120 used in the present invention. A groove 121 having a width slightly wider than the entire length of the flux-coated low melting point fusible alloy piece is formed. is there. The shape of the groove 121 is not particularly limited as long as it is as shallow as possible to accommodate the entire length of the flux-coated low melting point fusible alloy piece. For example, as shown in FIG. May be formed.

In order to manufacture the thin temperature fuse shown in FIG. 1 according to the first aspect of the present invention, each end of a pair of lead conductors is provided on both ends of the resin base film from the back to the front. A low-melting-point fusible alloy piece was connected between the exposed portions, and a temperature fuse body (A in FIG. 1) in which a flux was applied to the low-melting-point fusible alloy piece was manufactured. First, the resin-based film 11 of the temperature fuse body A
Is set on the base B, and the resin base film 11 is set.
The long resin cover film 120 (the long resin cover film 120 and the resin base film 11) are placed on the temperature fuse body A in a direction orthogonal to the longitudinal direction of the lead conductor 2.
(Equal width) is extended and placed (spaced in FIG. 3 for convenience of illustration), and the position of the long resin cover film 120 is adjusted by an alignment jig (not shown). The heating die D having the concave portion c for accommodating the flux-coated low-melting-point fusible alloy piece a is lowered by performing alignment (positioning in the longitudinal direction of the lead conductor as described later). A long resin base film 12 is provided around the periphery of the flux-coated low melting point fusible alloy piece a.
0 is heat-sealed.

In the heating mold D, a resin base film 1
A Thomson blade is provided so as to cut the resin cover film 120 at both end edges having a width of 1, and the resin cover film 120 is cut at the same time as the above-mentioned heat fusion, or a separate heat mold D is used. The resin cover film 120 is cut by the cutter after the above-mentioned heat fusion, and the production of the thin temperature fuse shown in FIG. 1 is completed. In the above, the resin base film may be made longer than the final size, and after the above-mentioned heat fusion, the resin cover film 120 and the resin cover film may be cut at once.

In the above, the long resin cover film 1
20 is extended into the space above the resin base film 11, and both ends thereof are supported by a clamp or the like with a constant low gripping force, so that the heating mold resists the low gripping force of the long resin cover film. Thus, the lowering may be performed under a low tension (a low tension that does not substantially cause elongation of the long resin cover film). The ultrasonic welding tool horn having a recess for accommodating the flux-coated low-melting-point fusible alloy piece may be used instead of the heating mold D for ultrasonic welding.

In the above description, the base B and the mold D are connected by guide pins, and the resin base film 11 of the temperature fuse body a is placed on the base B by a positioning means provided on the base B. In this case, the position can be naturally adjusted such that the flux application flux a is accommodated in the contour of the concave portion c of the mold D.

In the above, the long resin cover film 1
Flux coated low melting point fusible alloy piece a in groove 121
, It is necessary to align the long film 120 with respect to the longitudinal direction of the lead conductor 2 of the temperature fuse body A, but there is no need to align with the direction perpendicular to the longitudinal direction. It is. Therefore, the alignment of the long resin cover film only needs to be performed in one direction, and the alignment is easier than in the case where the alignment in two directions is required. Simplification can be achieved. In addition, it is possible to guarantee the positioning with sufficient accuracy, and eliminate the flux from being caught in the sealing interface, thereby producing a high-quality thin temperature fuse having excellent sealing properties.

According to the first aspect of the present invention, as shown in FIG.
Of the other lead conductor 22 is fixed to the front surface, and a low melting point fusible alloy piece 3 is connected between the front ends of the lead conductors 22. The present invention can also be applied to the manufacture of a thin temperature fuse in which the temperature fuse body a in which the flux 4 is applied to the alloy piece 3 is sealed with the resin base film 12.

According to a first aspect of the present invention, there is provided a method for manufacturing a thin temperature fuse, comprising: arranging a plurality of temperature fuse bodies in parallel, and arranging a long resin cover film having a continuous groove thereon.
The present invention can also be implemented in such a manner that all the temperature fuse bodies arranged in parallel are sealed at once using this long resin cover film. In this case, the resin cover films of the plurality of temperature fuse bodies in parallel may be made continuous and long, and both long resin films may be connected to a predetermined width after sealing.

FIGS. 5 (a) and 5 (b) [a cross-sectional view taken along the roll of FIG. 5 (a)] show an example of a thin temperature fuse manufactured according to the second aspect of the present invention. ing. In FIG. 5, 11 is a base resin film, 12 is a resin cover film, 2 is a strip-shaped lead conductor, and 3 is a low melting point connected between the tips of the strip-shaped lead conductors 2 and 2. The fusible alloy pieces 4 indicate the flux applied to the low melting point fusible alloy pieces 3, respectively, and the resin cover film 12 has a space for accommodating the flux applied low melting point fusible alloy pieces a.

In order to manufacture the thin temperature fuse shown in FIG. 5 according to the second aspect of the present invention, a low melting point fusible alloy piece is connected between the tips of a pair of strip-shaped lead conductors arranged on the same straight line. Then, a flux is applied to the low-melting-point fusible alloy piece to form a main body of the temperature fuse. In FIG. The fusible alloy piece a is placed and a smooth long resin base film 110 is extended immediately below the flux-coated low melting point fusible alloy piece a in a direction perpendicular to the longitudinal direction of the lead conductor 2. And the continuous groove forming long resin cover film 120 immediately above the flux-applied low melting point fusible alloy piece a.
Is extended in the direction perpendicular to the longitudinal direction of the lead conductor 2 (the length of the long resin cover film 120 and the length of the long resin base film 110 are the same), and the flux is coated with a low melting point. The heating die D having the concave portion c for accommodating the alloy piece a or the ultrasonic welding tool horn is lowered so that the flux-applied low melting point fusible alloy piece a on the resin base film 110 is elongated in the peripheral portion. The resin cover film 120 is heat-sealed or ultrasonic-welded, and the two long films 1 are simultaneously welded together.
10, 120, or both the long films are cut after the above-mentioned heat welding by a cutter separate from a heating mold or an ultrasonic welding tool horn. −
End of production

FIG. 7 shows a method for manufacturing a thin temperature fuse according to a second embodiment of the present invention, in which a continuous groove is formed on a long resin base film 110 in the same manner as the long resin cover film 120. It can also be used to produce a thin temperature fuse as shown.

In the method for manufacturing a thin temperature fuse according to the second aspect, the alignment of the resin cover film 120 may be performed only in one direction (the direction of the lead conductor), and the alignment is easy. Therefore, the workability can be improved or the manufacturing equipment can be simplified. Therefore, under the alignment with sufficient accuracy, the entrapment of the flux into the sealing interface is eliminated to improve the sealing property. An excellent high quality thin temperature fuse can be easily manufactured.

According to a second aspect of the present invention, there is provided a method of manufacturing a thin temperature fuse, wherein a plurality of temperature fuses are arranged in parallel, and a long resin cover film and a long resin base film are provided above and below these. The entire temperature fuse body may be sealed at once using the long resin film.

The resin base film and the resin cover film used in the present invention include thermoplastic resin films such as engineering plastics such as polyethylene terephthalate, polyphenylene sulfide, polyamide, polyimide, polyphenylene oxide and polysulfone. Can be used. In particular, when a long resin base film or a resin cover film having a convex portion 122 or a concave portion formed on the bottom surface of the groove 121 as shown in FIG. The rib can act as a ridge or a ridge against bending along the longitudinal direction of the fuse (lead wire direction), and the bending strength of the temperature fuse can be improved.

For the strip-shaped lead conductor, for example, copper, aluminum, nickel or the like can be used. As the low melting point fusible alloy piece, one having a melting point corresponding to the operating temperature of the temperature fuse can be used, and as the flux, one containing rosin as a main component can be used.

An example of the dimensions and materials of the thin temperature fuse manufactured according to the present invention is as follows. The resin base film and the resin cover film have a thickness of 200 μm and a plane size of 5 mm.
× 11 mm polyethylene terephthalate film, strip-shaped lead conductor having a thickness of 100 μm, a width of 3.5 mm,
It is a 13 mm long nickel strip (copper clad at the tip) with a low melting point fusible alloy piece having a eutectic point temperature of 94 ° C, a cross-sectional area of 0.07 mm ² , and a thickness of 50 μm. What is used as a component can be illustrated.

[0026]

According to the method for manufacturing a thin temperature fuse according to the present invention, although the resin cover film is provided with a space for accommodating the flux-coated low melting point fusible alloy piece, Positioning for placing the flux-coated low-melting-point fusible alloy piece in the space of the resin cover film only needs to be performed in one direction (for example, the direction of the lead conductor), and in a direction orthogonal to the one direction. No positioning is required, so positioning is easy, and manufacturing can be facilitated or manufacturing equipment can be simplified. In addition, good sealing performance can be ensured due to excellent positioning accuracy, and a high-quality thin temperature fuse can be easily manufactured with a good yield.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a thin temperature fuse manufactured by the method according to claim 1;

FIG. 2 is a view showing a long resin cover film used in the present invention.

FIG. 3 is a view showing an embodiment of a method of manufacturing a thin temperature fuse according to claim 1;

FIG. 4 is a drawing showing another example of a thin temperature fuse manufactured by the method according to claim 1;

FIG. 5 is a view showing an example of a thin temperature fuse manufactured by the method according to claim 2;

FIG. 6 is a view showing an embodiment of a method of manufacturing a thin temperature fuse according to claim 2;

FIG. 7 is a drawing showing another example of a thin temperature fuse manufactured by the method according to claim 2;

[Description of Signs] 11 Resin base film 12 Resin cover film 2 Lead conductor 3 Low melting point fusible alloy piece 4 Flux a Flux coated low melting point fusible alloy piece A Temperature fuse body 120 Long resin cover -Film 121 continuous groove B base c concave D mold

Claims (3)

[Claims] 1. A pair of lead conductors are exposed on a resin-based film from the back surface to the front surface, and a low melting point fusible alloy piece is connected between the exposed portions. A flux fuse is applied to the molten alloy piece to produce a temperature fuse body, and a long resin cover film formed with a continuous groove having a width sufficient to accommodate the entire length of the flux-coated low melting point fusible alloy piece is subjected to the temperature fuse. A long resin cover film is fused to the resin base film at the periphery surrounding the above-mentioned flux-coated low melting point fusible alloy piece placed on the resin base film of the base body. A method of manufacturing a thin temperature fuse. 2. A low melting point fusible alloy piece is connected between the tips of a pair of lead conductors, and a flux is applied to the low melting point fusible alloy piece. Bee
This is a method for producing a temperature fuse which is sealed by fusing a peripheral portion of a resin film and a resin cover film, wherein the flux-coated low melting point fusible alloy piece is sandwiched between the lead conductors. A long resin base film and a long resin cover film extending in a direction crossing the longitudinal direction of the conductor, and at least one of the two long films has a total length of the flux-coated low melting point fusible alloy piece. A continuous groove having a width capable of accommodating is formed, and these two long films are fused at a peripheral portion surrounding the flux-coated low melting point fusible alloy piece,
A method for producing a thin temperature fuse, comprising cutting at a predetermined width. 3. A resin base film having one end of a pair of lead conductors exposed from the back surface to the front surface, the other end of the lead conductor fixed to the front surface, and the end portions thereof being fixed. 2. The method of manufacturing a thin temperature fuse according to claim 1, wherein the temperature fuse is formed by connecting a flux and applying a flux to the low melting point fusible alloy piece.