JP3289555B2 - Thermal battery with piezoelectric spark plug - 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 a piezoelectric ignition plug.

[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 supplies electric power to the outside, and is a kind of storage battery. Therefore, the storage life is extremely good, and even after storage for 5 to 10 years, the battery can be used without any change in the battery performance immediately after production. Further, since the electrode is operated at a high temperature, the electrode reaction easily proceeds and has a high output characteristic, so that it is used as a power supply for defense equipment such as various flying objects and guidance equipment and an emergency power supply.

Hereinafter, a conventional thermal battery using a piezoelectric ignition plug will be described with reference to FIG. In FIG. 2, an input terminal 3 of a hermetic seal and a glass insulating portion 4 are formed on a battery outer cover main body 2. Piezoelectric spark plug 7 inside the battery
And comprises an ignition terminal 5 and an ignition agent 6. Also,
A lid heat insulator 8 is provided around the piezoelectric ignition plug, and forms a housing portion for the ignition plug.

As an ignition mechanism, when an external pressure is applied to the piezoelectric activation device 1 mounted outside the battery, high voltage energy is discharged at the ignition terminal 5 through the input terminal portion 3 of the hermetic seal, and the high voltage energy is discharged. In this method, the igniting agent 6 is burned by voltage energy to activate the thermal battery (for example, JP-A-5-159788).

[0005]

However, in the conventional structure, a creeping discharge peculiar to a high voltage may occur between the glass insulating portion of the hermetic seal and the lid heat insulator, and the high voltage from the piezoelectric starting device may be generated. Energy may leak along the glass insulating part due to creeping discharge between the glass insulating part of the hermetic seal and the lid insulator, and high voltage energy may not be supplied to the ignition terminal of the piezoelectric spark plug, and the piezoelectric spark plug may not ignite, The reliability of ignition was poor.

An object of the present invention is to solve the above-mentioned problems and to provide a thermal battery provided with a piezoelectric ignition plug capable of improving ignition reliability of the piezoelectric ignition plug without generating creeping discharge. With the goal.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has been achieved by providing an insulating layer at least in a glass insulating portion between a glass insulating portion of a hermetic seal and a lid heat insulator. Prevents leakage due to voltage energy,
An object of the present invention is to improve the reliability of ignition by supplying high-voltage energy to a piezoelectric ignition plug.

[0008]

As described above, by providing an insulating layer on the glass insulating portion between the glass insulating portion of the hermetic seal and the lid heat insulator, creeping discharge of the hermetic seal glass insulating portion due to high voltage energy can be prevented. it can.
As a result, high-voltage energy is supplied to the piezoelectric ignition plug without electric leakage, and ignition reliability can be improved.

[0009]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of an ignition mechanism of a thermal battery using a piezoelectric ignition plug. Reference numeral 1 denotes a piezoelectric actuating device which generates a high voltage, and 2 denotes an exterior lid body which is composed of an input terminal portion 3 of a hermetic seal and a glass insulating portion 4. Reference numeral 8 denotes a lid heat insulator that is a housing portion of the piezoelectric ignition plug. The present invention has a structure in which a silicone resin, which is an insulating layer of 9, is applied between the exterior lid body and the lid heat insulator. Also,
It is necessary to apply a larger amount than the glass insulating portion of the hermetic seal.

[0012] 200 thermal batteries using the thus-configured piezoelectric ignition plug were prototyped and subjected to an ignition test with a piezoelectric activation device, and it was confirmed that all of them ignited.

Also, in a structure having an insulating plate between the outer lid body and the lid heat insulator, the same result as described above can be obtained by applying a silicone resin as an insulating layer between the outer lid body and the insulating plate. Was confirmed.

In this embodiment, a silicon resin is used as the insulating layer. However, the same result was obtained by using an epoxy resin, a vinyl chloride resin, a polyimide resin, a phenol resin, and a polyphenylene sulfide resin.

[0014]

As described above, by providing an insulating layer between the glass insulating layer and the lid heat insulator, creeping discharge of the glass insulating portion of the hermetic seal is prevented, and there is no leakage of high voltage energy. By improving the ignition performance of the piezoelectric spark plug, a thermal battery equipped with a highly reliable piezoelectric spark plug has become possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ignition mechanism of a thermal battery using a piezoelectric ignition plug according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional thermal battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric activation device 2 Exterior lid main body 3 Hermetic seal input terminal part 4 Glass insulation part 5 Ignition terminal 6 Ignition agent 7 Piezoelectric ignition plug 8 Lid heat insulator 9 Silicon resin (insulation layer)

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Teruo Yamane 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-266896 (JP, A) JP-A-5-205 266900 (JP, A) Japanese Utility Model Showa 58-141567 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01M 6/36

Claims (1)

(57) [Claims] 1. A thermal battery comprising: a power generator in which a unit cell and a heating agent are laminated; an ignition pad for igniting the heating agent; and a piezoelectric spark plug ignited by a piezoelectric activation device. A thermal battery comprising a piezoelectric ignition plug in which an insulating layer is provided at least on a glass insulating portion between a glass insulating portion of a hermetic seal and a lid heat insulator at a terminal.