JP2004220930A - Thermal battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal battery with high reliability having an ignition plug on which, high voltage can be surely impressed by preventing creeping discharge generated at an interface between a holder and a resin part. <P>SOLUTION: The thermal battery comprises a generating body formed by alternately laminating unit cells and heating agents, an ignition sheet igniting the heating agent, and an ignition plug connected to a piezoelectric element by a pair of lead wires and igniting the ignition sheet. The ignition plug is composed of a holder 15 holding a terminal part 14 each of the lead wires so as to face each other, an ignition agent 16 covering the terminal parts 14, and a resin part 17 covering the bottom surface of the holder and the lead wires. The resin part and the holder are joined by an adhesive 19. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２１】
比較例では、点火栓が発火せずに電池が作動しないものがみられたが、実施例では全ての電池が作動し、確実に点火栓が発火することがわかった。
【００２２】
【発明の効果】
以上のように、本発明によれば、保持体と樹脂部との界面で生じる沿面放電を防止することにより、確実に高電圧が印加される点火栓を備えた高信頼性の熱電池を提供することができる。
【図面の簡単な説明】
【図１】熱電池本体の構造を示す断面図である。
【図２】従来の熱電池における点火栓の一例の断面拡大図である。
【図３】本発明の熱電池における点火栓の一例の断面拡大図である。
【符号の説明】
１ 素電池
２ 加熱剤
３ 発電体
４ 着火シート
５ 点火栓
６ リード線
７ 点火装置
８ 断熱材
９ 負極リード部
１０ 正極リード部
１１ 通過孔
１２ 蓋部
１３ 圧電素子
１４ リード線端部
１５ 保持体
１６ 点火剤
１７ 樹脂部
１８ 電池ケース
１９ 接着剤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thermal battery having an ignition plug, and more particularly, to a structure of the ignition plug.
[0002]
[Prior art]
FIG. 1 shows a structure of a thermal battery provided with an ignition device using a piezoelectric element.
A unit cell 1 and a heating agent 2 for heating and activating the unit cell 1 are alternately stacked to form a power generator 3, and an ignition sheet 4 is disposed on the upper and side surfaces of the power generator 3. An ignition plug 5 is provided above the power generator 3, and the ignition plug 5 is connected to an ignition device 7 having a piezoelectric element 13 via a pair of lead wires 6.
[0003]
The power generator 3 is housed in a battery case 18 in a state of being covered with a heat insulating material 8 made of ceramic fiber. The opening of the battery case 18 is closed with a positive electrode lead 10 and a negative electrode lead 9 of the power generator 3 and a lid 12 having a through hole 11 for a pair of lead wires 6. Each passage hole 11 is provided with a hermetic seal. When an impact or the like is applied to the piezoelectric element 13, a high voltage is applied to the ignition plug 5, the ignition plug 5 is ignited, and the ignition sheet 4 is ignited. Then, the combustion of the ignition sheet 4 further propagates to the heating agent 2.
[0004]
FIG. 2 shows an enlarged cross-sectional view of an example of the ignition plug 5.
The ignition plug 5 includes a holder 15 for holding the ends 14 of the pair of lead wires 6 facing each other, and an igniter 16 covering the ends 14 of the lead wires 6 above the holder 15. Then, in order to prevent leakage of high-voltage energy and deformation of the lead wire, the resin portion 17 is formed by applying an insulating resin so as to cover the lead wire 6 exposed at the lower part of the holding body 15 ( For example, Patent Document 1).
[0005]
[Patent Document 1]
JP-A-7-282820
[Problems to be solved by the invention]
However, when a physical force is applied to the lead wire when attaching the ignition plug to the battery lid, the resin portion may be peeled off from the holder and a gap may be formed between the holder and the resin portion. If creeping discharge occurs in this portion, there is a problem that sufficient high-voltage energy is not supplied to the ignition plug and the ignition plug does not ignite.
[0007]
Therefore, the present invention solves the above-mentioned problem by preventing creeping discharge occurring at the interface between the holder and the resin portion, thereby providing a highly reliable heat source having an ignition plug to which a high voltage is reliably applied. Provide batteries.
[0008]
[Means for Solving the Problems]
The thermal battery of the present invention includes a power generator in which unit cells and a heating agent are alternately stacked, an ignition sheet for igniting the heating agent, an ignition plug connected to the piezoelectric element by a pair of lead wires, and igniting the ignition sheet. A thermal battery comprising: a holder for holding the ignition plug with the ends of the lead wires facing each other; an igniter for covering the ends; and a resin part for covering the bottom surface of the holder and the leads. Wherein the resin portion and the holder are joined by an adhesive.
The adhesive preferably contains at least one selected from the group consisting of a silane coupling primer, a urethane primer, a modified silicone primer, and a polysulfide primer.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The thermal battery of the present invention includes a power generator in which unit cells and a heating agent are alternately stacked, an ignition sheet for igniting the heating agent, an ignition plug connected to the piezoelectric element by a pair of lead wires, and igniting the ignition sheet. Have.
The unit cell includes a negative electrode layer made of lithium, potassium, or the like, an electrolyte layer made of lithium chloride-potassium chloride co-mixed salt, or the like, and a positive electrode layer containing iron disulfide, calcium chromate, or the like as a main component. .
[0010]
As the heating agent, for example, a mixture of a metal powder such as iron powder and an oxidizing agent such as potassium perchlorate is used.
For example, a mixture of a metal powder such as zirconium powder and an oxidizing agent such as barium chromate is used as the ignition sheet disposed on the upper and side portions of the power generator.
The piezoelectric element is installed in an ignition device, and when an impact or the like is applied to the piezoelectric element, a high voltage is applied to the ignition plug. At this time, the spark generated by the discharge ignites the ignition sheet.
[0011]
According to the present invention, the ignition plug comprises a holder for holding the ends of the lead wires facing each other, an igniter for covering the ends of the lead wires, and a resin portion for covering the bottom surface of the holder and the leads. It is characterized in that the resin portion and the holder are joined by an adhesive.
[0012]
FIG. 3 is an enlarged sectional view of an example of the ignition plug in the thermal battery of the present invention.
The ignition plug 5 includes a holder 15 for holding the ends 14 of the pair of lead wires 6 facing each other, and an igniter 16 covering the ends 14 of the lead wires 6 above the holder 15. In order to prevent leakage of high voltage energy and deformation of the lead wire, a resin portion 17 is formed by applying an insulating resin so as to cover the lead wire 6 exposed at the lower portion of the holder 15. The holding body 15 and the resin portion 17 are joined by an adhesive 19.
[0013]
Thereby, the adhesive force between the holder and the resin portion is sufficiently strengthened, so that it is possible to prevent the resin portion from peeling off from the holder due to an impact applied in a manufacturing process of the thermal battery or the like. For this reason, creeping discharge occurring at the interface between the holder and the resin portion can be prevented. Since such an ignition plug reliably ignites, a highly reliable thermal battery can be obtained.
[0014]
The adhesive preferably contains at least one selected from the group consisting of a silane coupling primer, a urethane primer, a modified silicone primer, and a polysulfide primer. Among them, a silane coupling primer is particularly preferable from the viewpoint of improving the affinity between the support made of glass and the resin part made of an insulating resin.
[0015]
As the igniting agent, for example, a mixture of a metal powder such as zirconium, an oxidizing agent such as barium chromate, and inorganic short fibers is used.
For the resin portion, for example, a silicone resin or the like is used.
[0016]
【Example】
Hereinafter, the thermal battery of the present invention will be specifically described based on examples.
"Example"
The ignition plug shown in FIG. 3 was manufactured as follows.
A silane coupling-based primer (Hamatite adhesion promoting primer, manufactured by Yokohama Rubber Co., Ltd.) was applied as an adhesive 19 to the bottom surface of a glass holding body 15 that holds the ends 14 of the pair of lead wires 6 facing each other. Then, a resin portion 17 was formed by applying a silicone resin so as to cover the lead wires 6 exposed at the lower portion of the holding member 15, and the holding member 15 and the resin portion 17 were joined via an adhesive 19.
Using this ignition plug, a thermal battery having the same structure as that of FIG. 1 was produced.
[0017]
At this time, the cell 1 was composed of a negative electrode layer made of lithium, an electrolyte layer made of a lithium chloride-potassium chloride eutectic mixed salt, and a positive electrode layer made of iron disulfide. As the heating agent 2, a mixture of iron powder and potassium perchlorate was used.
As the ignition sheet 4 and the igniter 16, a mixture of zirconium and barium chromate was used.
[0018]
<< Comparative Example >>
The ignition plug shown in FIG. 2 was produced in the same manner as in the example except that the silicone resin was directly applied to the bottom surface of the glass holder without applying the adhesive. A thermal battery having the same structure as that of the example except that this ignition plug was used was produced.
[0019]
The thermal batteries of the above-described Examples and Comparative Examples were each manufactured in 100 pieces, and it was examined whether or not the spark plug ignited and the batteries operated. Table 1 shows the test results.
[0020]
[Table 1]

[0021]
In the comparative example, some batteries did not operate because the ignition plug did not ignite. However, in the examples, all the batteries were activated and the ignition plug was surely ignited.
[0022]
【The invention's effect】
As described above, according to the present invention, a highly reliable thermal battery including an ignition plug to which a high voltage is reliably applied is provided by preventing creeping discharge occurring at an interface between a holder and a resin portion. can do.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a structure of a thermal battery main body.
FIG. 2 is an enlarged cross-sectional view of an example of an ignition plug in a conventional thermal battery.
FIG. 3 is an enlarged sectional view of an example of an ignition plug in the thermal battery of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Unit cell 2 Heating agent 3 Power generator 4 Ignition sheet 5 Ignition plug 6 Lead wire 7 Ignition device 8 Insulation material 9 Negative lead part 10 Positive lead part 11 Passage hole 12 Cover part 13 Piezoelectric element 14 Lead wire end part 15 Holder 16 Ignition agent 17 Resin part 18 Battery case 19 Adhesive

Claims (2)

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 ignition plug connected to the piezoelectric element by a pair of leads to ignite the ignition sheet. ,
The ignition plug comprises a holder for holding the ends of the lead wires facing each other, an igniter for covering the ends, and a resin part for covering the bottom surface of the holder and the leads. A thermal battery, wherein the holder and the holder are joined by an adhesive. 2. The thermal battery according to claim 1, wherein the adhesive includes at least one selected from the group consisting of a silane coupling primer, a urethane primer, a modified silicone primer, and a polysulfide primer.

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