JPH0320025B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a thermal battery equipped with an impact type igniter, and more particularly to an improvement of a striking core movable part for operating the above-mentioned igniter. Construction of conventional examples and their problems As is well known, thermal batteries are batteries that use an inorganic salt as an electrolyte that is solid at room temperature but melts when heated to high temperatures and exhibits good ionic conductivity. Eutectic salts and mixed salts such as potassium-lithium chloride, potassium bromide-lithium bromide, and sodium aluminum chloride are often used. These electrolytes are highly hygroscopic and have such properties that they deliquesce if left in the atmosphere for a while. Therefore, unless the exterior is completely sealed, the electrical conductivity will gradually improve during long-term storage, resulting in self-discharge. On the other hand, since it is necessary to heat and activate an inactive battery, a heat generating agent is built in to make it easier to use. For this purpose, an ignition device is required to ignite the exothermic agent, and as is already well known, there are various types of ignition devices, such as electric type, impact type, and spontaneous ignition point type. Proposals for the operating structure of conventional impact igniters are proposed in U.S. Patent No. 3679487, Japanese Patent Publication No. 17326-1987, and Japanese Patent Publication No.
This is shown in Publication No. 52-24973, etc. These are systems in which the firing core is actuated by a spring or by pushing the spring apart, and in both cases, the firing core directly strikes the impact type igniter. Therefore, in order to completely seal the exterior as described above, it was necessary to seal the area immediately above the igniter with a thin metal foil. FIG. 1 is a sectional view showing a part of a typical conventional structure, and in addition to this, a striking center and its movable part are required. In the figure, 1 is an igniter, and 2 is a steel ball.In order to activate the igniter 1, it is necessary to hit the steel ball 2 correctly with the striking core, but it is very difficult to improve its reliability. Therefore, a steel ball holder 3 is used to center the steel balls 2. 4 is a thin metal plate such as copper foil, which is used to transmit the impact force of the striking core to the steel ball without significant loss and to seal the battery. Therefore, when the striking core is activated, the copper foil 4 is broken. Reference numeral 5 is an exterior cover of the battery, 6 is a holder for an igniter, and 7 is a vent hole. The drawbacks of the above conventional example are as follows. (1) If the striking core strikes the center of the igniter reliably, or if it strikes using an indirect object such as a steel ball, it is difficult to improve the reliability of its operation. (2) Since it breaks the copper foil etc. during operation, the high temperature and high pressure gas generated from inside the battery is released outside the battery during operation and has a negative impact on surrounding equipment. (3) The sealing work between the copper foil and the battery outer cover is unreliable, and during soldering work, the solder wraps around the copper foil and is difficult to form uniformly. Purpose of the invention The present invention simplifies the structure of an impact type ignition device,
Another object of the present invention is to provide a highly reliable thermal battery that is suitable for complete sealing and that can reliably hit the center of the igniter. Structure of the Invention The present invention provides a hygroscopic electrolyte, a low potential negative electrode active material,
Equipped with a power generation element made of a positive electrode active material, a heat generating agent whose main components are metal powder and oxidizer powder, and an impact type igniter that ignites the heat generating agent, the striking rod is suspended in the center of the beating part, The beating part is fixed to the exterior lid. The beating part has a structure that can be moved by bending, and when an impact force is applied to the striking core rod, the beating part bends and the striking core violently strikes the igniter. Therefore, the igniter leaves a mark and emits a flame to ignite the exothermic agent. DESCRIPTION OF EMBODIMENTS FIG. 2 is a longitudinal sectional view of an impact type ignition device in which a striking rod and a beating part are integrated. In the figure, 1 is an impact type igniter. 8 is the striking rod, which is made of relatively hard material such as SK steel.
Reference numeral 9 denotes a beating part, which is formed integrally with the striking rod 8 by forming a plurality of concentric circular grooves 9a and 9b on a thin plate having spring properties, such as a phosphor bronze plate or a stainless steel plate, as shown in the figure. be. There may be only one groove.
In this state, when the striking rod 8 is pushed by hand, it moves up and down. This beating part 9 is set on the exterior lid 5 so as to close the through hole of the exterior lid, and the peripheral portion is fixed with solder or silver solder 10. Afterwards, the igniter 1 is set in the igniter holder 6 having the vent hole 7, the striking wick holder 11 is arranged, and the igniter holder 6 is integrated with the exterior lid 5 by welding. FIG. 3 shows another embodiment. Heartbeat section 9 in Figure 2
The beating part 9' in this example moves up and down by means of a bent part 9c provided close to the striking center fixing part, whereas the beating part 9' in this example moves up and down by deforming the groove. The fixing portion 12 is also an example of argon welding. Figure 4 shows the structure of a thermal battery. 13 is a unit cell with calcium as the negative electrode and potassium chloride as the electrolyte.
Lithium chloride eutectic salt and calcium chromate are used as the positive electrode active material, and the voltage is approximately 20V when 8 cells are connected in series.
generate electricity. Reference numeral 14 denotes a heat generating agent mainly composed of zirconium and barium chromate, which is laminated alternately with the unit cells 13, with heat storage agent layers 15 at both ends. Reference numerals 16 and 17 denote a pair of output terminals, which are positive or negative terminals for outputting power and are glass-sealed terminals attached to the exterior lid 5. Reference numeral 18 denotes a vent hole in the laminated portion that communicates with the vent hole 7, and is connected to the igniter 1.
The flame from the fire passes through this vent. Reference numeral 19 denotes a heat insulating material layer, and 20 denotes an outer case in which various parts are housed, and a fitting portion 21 with the outer cover 5 is sealed by welding. A is the impact type ignition device shown in FIG. In FIG. 4, when an impact force is applied to the ignition device A from the direction of arrow F, the striking rod 8 is pushed and the beating part 9
lowers and hits the igniter 1 violently, the igniter emits a flame that passes through the vent hole 7 and is further led to the stack vent hole 18, igniting the exothermic agent 14 in each layer one after another, causing the entire battery to ignite. is heated to a high temperature to melt the electrolyte. The effects of the percussion type thermal battery using the present invention are shown in the table below in comparison with the conventional percussion type thermal battery.

[Table] Note that gas leakage during operation in the table indicates whether or not high-temperature gas inside the battery leaks out of the battery, and the man-hour ratio refers to the number of man-hours in the conventional example shown in The man-hour ratio of the present example shown in FIG. 2 when Effects of the Invention As described above, according to the present invention, the following effects can be obtained. (1) Even during operation, the gas generated inside the battery does not escape to the outside, so there is little heat loss and there is no negative impact on peripheral equipment. (2) Since the structure is simple, complete sealing is easy and manufacturing is easy. (3) The activation rate of the igniter is improved. As described above, according to the present invention, it is possible to improve the characteristics of a thermal battery having an impact type ignition device.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional ignition device, Fig. 2 is a longitudinal sectional view of an ignition device according to an embodiment of the present invention, Fig. 3 is a longitudinal sectional view showing another configuration example, and Fig. 4 is a thermal battery. FIG. 2 is a vertical cross-sectional view showing the overall configuration of. 1...Igniter, 5...Exterior lid, 8...Striking rod,
9,9'...beating part, 13...cell battery, 14...
Exothermic agent, 20...Exterior case.

Claims (1)

[Scope of Claims] 1. It has a unit cell 13 including a hygroscopic electrolyte, a heat generating agent 14, an exterior lid 5, and an impact type ignition device A for igniting the heat generating agent 14, wherein the impact type ignition device A , an igniter 1, a striking rod 8, and a beating part 9, the igniter 1 emits a flame by an impact force, and the striking rod 8 strikes the igniter 1 by an external force and ignites it. The beating part 9 is flexible, and its end is fixed to the battery exterior lid 5, and the striking rod 8 is fixed in the air almost at its center. The beating part 9 is a thermal battery that bends due to the impact received by the striking rod and hits the striking rod against the igniter 1.