JP3293417B2 - Thermal battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal battery, and more particularly to a thermal battery having an ignition ball.

[0002]

2. Description of the Related Art A thermal battery is inactive at room temperature, but becomes active when heated to a high temperature and can supply electric power to the outside, and is a kind of storage battery. Therefore, the storage life is very good, and it can be used without any change in characteristics even after storage for 5 to 10 years. In addition, since the electrodes are operated at a high temperature, the electrode reaction easily proceeds and has high output characteristics, so that it is used as a power source for various defense devices such as missiles and guidance devices and an emergency power source.

A thermal battery using an electric spark plug, a firing type detonator, and a piezoelectric spark plug as a battery starting device is already known, but an electric ignition ball or a piezoelectric ignition ball can withstand high impact. Because it is not possible, specially designed ignition balls have been used, such as being housed in a container or the like and completely fixed with a resin mold or the like.

[0004] Therefore, there have been problems such as high cost and large size.

[0005]

The above current problems are as follows.
This has been caused by the fact that the ignition agent of the electric ignition ball or the piezoelectric ignition ball is weak in strength.

Conventionally, a method for producing an igniting agent for an electric ignition ball or a piezoelectric ignition ball is to apply a mixture of a metal powder and an oxidizing agent to an electric bridge portion and then coat a resin film such as cellulose acetate as a reinforcing agent. Being manufactured.

However, under the severe conditions required for various flying objects, for example, under high impact of several thousand G or more to tens of thousands of G, the strength of the electric ignition ball or the piezoelectric ignition ball is not sufficient. In some cases, the igniting agent may fall off or peel off, causing the ignition of the thermal battery at the start of the thermal battery and the thermal battery not operating, resulting in low reliability and poor practicability.

The present invention solves the above-mentioned conventional problems, and can be used even in a small space by performing processing that can use an electric ignition ball or a piezoelectric ignition ball even with a high impact. It is an object of the present invention to provide a low-cost, widely-handled thermal battery.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an ignition ball holder and a resin coating layer formed around the ignition ball to fix the ignition ball.

[0010]

As described above, the thermal battery reinforced with the electric ignition ball or the piezoelectric ignition ball improves the reliability of ignition without dropping or peeling of the igniting agent even with a high impact up to 20,000 G, It can be used under all conditions and can be used as a power source for various flying objects and an emergency power source.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view of a thermal battery. In FIG. 1, reference numeral 1 denotes a unit cell including a negative electrode layer made of lithium, calcium, etc., an electrolyte layer using lithium chloride-potassium chloride eutectic mixed salt as an electrolyte, and a positive electrode layer mainly containing iron disulfide and calcium chromate. It is composed of
Reference numeral 2 denotes a heat-generating agent, which is a compact formed by pressure-molding a powder obtained by mixing a metal powder and an oxidizing agent, for example, iron powder and potassium perchlorate.
A plurality of these are alternately stacked to form a power generator.

Reference numeral 3 denotes an electric or piezoelectric ignition ball, the surface of which is integral with the ignition ball holder 4 made of a heat-resistant resin, which is reinforced by a resin coating layer 9.

Reference numeral 5 denotes an ignition terminal, which supplies ignition energy from the outside to ignite an electric ignition ball or piezoelectric ignition ball, which is transmitted to an ignition sheet, and ignites and burns a heating agent. The unit cell 1 is heated and generated by the heat of combustion of the exothermic agent 2, and power is supplied to the outside through the output terminal 7.

The ignition sheet 6 is formed of a mixture containing zirconium powder, barium chromate and inorganic short fibers as main components.

FIG. 2 is a detailed view of the exterior lid used in the present invention. Reference numeral 8 denotes an exterior lid, to which a lead wire of an electric ignition ball or a piezoelectric ignition ball of 3 is connected to an ignition terminal of 5 by soldering or the like, and then an ignition ball holder of 4 is incorporated into the exterior lid 8 with an adhesive. .

After attaching three ignition balls to the ignition terminals 5 of the outer cover 8 and mounting the ignition ball holder 4, the entire surface of the three electric or piezoelectric ignition balls and the inner surface of the four ignition ball holders are simultaneously placed. A resin coating layer 9 coated with a resin is formed.

As a coating agent for the resin coating layer 9, a 20% solution of cellulose acetate dissolved in a solvent (methyl acetate) or a 20% solution of vinyl chloride dissolved in a solvent (butyl acetate) is applied to the entire surface by a brush. And dried.

FIG. 3 shows the state of destruction of the electric or piezoelectric ignition ball 3 and the ignition test of the igniting agent by applying a shock of 1,000 to 20,000 G to the dummy battery by using the above outer cover and applying a shock of 1,000 to 20,000 G. This is the result of the implementation.

In FIG. 3, the probability that the conventional uncoated ignition ball will not ignite due to the drop of the igniter from several thousand G increases.

However, in the case of the present invention, the entire surface of the electric ignition ball or the piezoelectric ignition ball and the inner surface of the ignition ball holder are simultaneously coated with resin,
Even at 000 G, no cracking or falling off of the 100% igniting agent occurred, and it was confirmed that ignition occurred.

In this embodiment, cellulose acetate 20%
The surface was coated with the solution,
The same applies to a 30% solution, and a copolymer of vinyl chloride and vinyl acetate and a vinyl chloride resin were also dissolved in a solvent and confirmed with a 10% to 30% solution, but similar results were obtained.

[0023]

According to the structure of the present invention, it is possible to supply a thermal battery which can sufficiently withstand the mechanical strength (especially high impact) required for various power sources for a flying object and an emergency power source.

In addition, since there is no need for pre-processing such as placing the electric ignition ball or the piezoelectric ignition ball in a metal container so as to withstand a particularly high impact, it can be used at low cost and in a small space. The present invention is not limited to this, and can be expected to be widely used in various industries as power sources.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a thermal battery, showing one embodiment of the present invention.

FIG. 2 is a detailed view of a resin-coated exterior lid, showing one embodiment of the present invention.

FIG. 3 is a diagram showing an ignition rate in an impact test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit cell 2 Heating agent 3 Electric ignition ball or piezoelectric ignition ball 4 Ignition ball holder 5 Ignition terminal 6 Ignition sheet 7 Output terminal 8 Exterior lid 9 Resin coating layer

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiro Kimura 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-335229 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01M 6/36

Claims (1)

(57) [Claims] 1. A thermal battery comprising a power generator in which unit cells and a heating agent are alternately stacked, an ignition sheet for igniting the heating agent, and an electric ignition ball or a piezoelectric ignition ball for igniting the ignition sheet. A thermal battery in which a resin coating layer is formed around the ignition ball holder and the ignition ball to fix the ignition ball.