JPH0320024B2 - - 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 portion for operating the 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 type igniters are disclosed in US Pat. 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 just above the igniter with a thin inner metal foil. FIG. 1 is a sectional view showing a typical structure thereof.
In the figure, 1 is an impact type igniter, 1a is the ignition cap, 1b is the ignition charge, and 1c is the ignition metal.When an impact is applied from the ignition cap side and it deforms into a concave shape, the ignition charge is between the ignition metal and the ignition metal 1c. 1b is designed to emit flame due to friction and impact. Reference numeral 2 is a steel ball, which is designed to strike the center of the igniter 1 by a steel ball holder 3. Numeral 4 is a mounting bracket, 5 is an exterior lid, and 6 is a metal foil that is sealed with the exterior lid 5 by soldering. The disadvantages of such a structure are as follows. (1) Structurally complex. (2) Complete sealing is unreliable. (3) The mechanism to ensure that the igniter hits the center is complicated, making it difficult to hit the center. Purpose of the invention The present invention simplifies the structure of an impact type ignition device,
The purpose of the present invention is to provide a highly reliable thermal battery that is suitable for complete sealing and ensures that the center of the igniter is struck. Structure of the Invention The present invention provides a hygroscopic electrolyte, a low potential negative electrode active material,
In a structure that includes 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, a glass-sealed terminal is used as the striking core. It is characterized by a thermal battery structure that combines the function of a seal and the function of a seal, and when an impact is applied, it definitely makes a mark on the igniter and generates a flame, which generates heat and generates electricity. DESCRIPTION OF EMBODIMENTS FIG. 2 shows a configuration diagram of a typical ignition device of the present invention, and FIG. 3 shows an overall configuration diagram of a thermal battery using the ignition device. In Fig. 2, 7 is a glass-sealed striking core;
7a is an outer ring metal, 7b is glass, and 7c is a striking rod. 8 is a center guide that allows the striking rod 7c to strike the center of the impact type igniter 1. Reference numeral 9 denotes a vent hole through which the flame emitted from the igniter 1 is guided. The glass-sealed striking core 7 is integrally attached to the battery exterior cover 5 by welding, soldering, or the like. Furthermore, the impact type ignition device is constructed by integrally attaching the mounting bracket 4 into which the igniter 1 is inserted and the exterior lid 5. In FIG. 3, numeral 10 is a unit cell, which uses calcium for the negative electrode, potassium chloride-lithium chloride eutectic salt for the electrolyte, and calcium chromate for the positive electrode active material, and generates approximately 20 V by connecting eight cells in series. 1
Reference numeral 1 denotes a heat generating agent mainly composed of zirconium and barium chromate, which is alternately laminated with unit cells 10 and has heat storage agent layers 14 at both ends thereof. Reference numerals 12 and 13 designate 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 15 indicates a vent hole in the laminated portion that communicates with the vent hole 9, and the flame from the igniter 1 passes through this vent hole. 16 is a heat insulating material layer, 17 is an exterior case housing each component, and a fitting portion 18 with the exterior lid 5.
be sealed by welding. A is the impact ignition device shown in FIG. In Figure 3, the impact force is applied to the arrow F by, for example, an actuating device that compresses a metal coil spring, an actuating device that moves a piston with high-pressure gas when a valve is opened, or an actuating device that energizes an electromagnetic solenoid. When applied to the igniter A from the direction, the striking rod 7c is pushed and hits the igniter 1 violently,
The igniter emits a flame that passes through the vent hole 9 and is further led to the stack vent hole 15, igniting the heating agent 11 in each layer one after another, raising the temperature of the entire battery to melt the electrolyte layer. 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] In addition, the operation rate in the table refers to the number of successful products when 20 test products are operated, and the performance deterioration during storage refers to the number of abnormal products that occur after 50 days of accelerated testing in a 60°C storage room. , and the man-hour ratio indicates the man-hour ratio of the present embodiment shown in FIG. 2 when the number of man-hours of the conventional example shown in FIG. 1 is set to 1. Effects of the Invention A feature of the present invention is that the above-described sequence of operations can be carried out reliably and the operation rate has also been improved. As mentioned above, the reason for this is that you can reliably hit the center of the igniter. Second, since a glass-sealed percussion core is used, the degree of sealing can be improved compared to conventional products, and performance deterioration due to moisture absorption during storage is drastically reduced. Thirdly, it cannot be overlooked that the structure has become simpler, making it easier to manufacture. As described above, the present invention can simplify the structure of an impact type ignition device and provide a highly reliable thermal battery.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional ignition device, FIG. 2 is a vertical cross-sectional view showing a configuration example of the ignition device of the present invention, and FIG.
The figure is a longitudinal sectional view showing the overall structure of the battery. 1...Igniter, 4...Mounting bracket, 5...Exterior lid, 7...Glass sealed striking core, 10...Battery, 1
1...Exothermic agent.

Claims (1)

[Scope of Claims] 1. It has a unit cell 10 including a hygroscopic electrolyte, a heat generating agent 11, an exterior lid 5, and an impact type ignition device A for igniting the heat generating agent 11, wherein the impact type ignition device A , an igniter 1, and a glass-sealed striking wick 7; the igniter 1 emits a flame by impact force; The striking rod 7c strikes the igniter 1 with an external force and applies an impact force to the igniter 1. The glass 7b is ring-shaped, and the striking rod 7c is arranged in the center of the glass 7b. is airtightly fixed, and its outer periphery is fixed by the outer ring metal 7a, and the outer ring metal 7a is integrally attached to the outer cover 5.