JPH0329134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in hammer type thermal batteries.

[Prior art] A thermal battery is a battery that uses molten salt as an electrolyte.During storage, the electrolyte is a non-conductive solid salt, so it cannot supply electricity to the outside, but it can be used with the ignition device installed in the battery. When activated, the heating element burns and the electrolyte is heated to a molten state with good conductivity.
This allows power to be supplied to the outside.
Generally, such thermal batteries use calcium metal for the negative electrode, a eutectic mixture of potassium chloride and lithium chloride for the electrolyte, and calcium chromate for the positive electrode, while others use a lithium alloy for the negative electrode, the eutectic mixture for the electrolyte, and sulfide for the positive electrode. Some use iron. A mixture of barium chromate and zirconium or a mixture of iron and potassium perchlorate is used as the heating element, and an igniter is provided to combust these heating elements. In addition, the igniters used in thermal batteries mainly include electric igniters using an electric detonator and hammer-type igniters using a percussion cap. The former type of electric igniter requires a power source external to the thermal battery to operate the electric detonator, and if such a power source is not available, the latter type of electric igniter is used.

A hammer-type thermal battery using a conventionally used torsion coil spring will be described below with reference to FIG. 2. In FIG. 2, reference numeral 1 denotes a battery case, and a detonator holder 2 is provided at the bottom of the battery case, into which a percussion cap 3 is press-fitted. Reference numeral 4 denotes a battery cover, which is provided with an output terminal 5 and is hermetically joined to the battery case 1 by welding. Inside the battery case 1, a unit cell 6 and a heating element 7 are stacked. The unit cell 6 consists of a positive electrode, an electrolyte, a negative electrode, and a current collector plate, and the constituent materials of each of the positive electrode, electrolyte, and negative electrode are as described above, and the current collector plate is made of iron or nickel plate. The heating element 7 is a unit cell 6
It is used to heat the battery, is placed between the unit cells 6 and at the outermost part, and is made of the above-mentioned material. A heat insulating body 8 is arranged around the stack of the unit cells 6 and the heating element 7, which makes it difficult to cool the unit batteries 6 and also prevents the unit batteries 6, the battery case 1, and the battery cover 6 from being cooled. Maintains insulation. Further, a fire guide hole 9 is provided in the center of the laminate. 10 is a housing of the igniter, which is fixed to the bottom surface of the battery case 1. housing 10
The rotating shaft 12 of the hammer 11 is attached,
A torsion coil spring 13 is attached to the rotating shaft 12.
is installed. One end of the torsion coil spring 13 is fixed to the housing 10, and the other end is hooked to the hammer 11 to apply rotational force to the hammer 11. Reference numeral 14 denotes an operating pin which is removably fixed to the housing 10 and holds the hammer 11 so that it does not rotate and move due to the force of the torsion coil spring 13.

In such a conventional thermal battery, when the operating pin 14 is pulled out, the hammer 11 rotates and moves by the force of the screw coil spring 13 and collides with the percussion cap 3 . The percussion cap 3 ignites due to the impact force, and the fuse 9
The heating element 7 generates heat through. As a result, the unit cell 6 is heated and becomes active, and electric power can be extracted from the output terminal 5.

[Problems to be Solved by the Invention] However, as described above, in the conventional hammer-type thermal battery using a torsion coil spring, the space in which the hammer 11 moves must be secured by the housing 10, so in some cases, The drawbacks are that the housing 10 must protrude from the battery diameter of the thermal battery, and that various electrical components cannot be placed on the bottom of the thermal battery, which limits the placement of the thermal battery. There were problems in that it was difficult to store and that a lot of space had to be cleared.

The present invention provides a hammer type thermal battery that solves the above-mentioned problems.

[Means for Solving the Problems] To this end, the present invention has a cylindrical housing for an igniter, and a firing pin that moves along the inner periphery of the housing by the force of a compression coil spring is disposed within the housing. In addition, the hammer is held by an operating pin so that it does not move due to the force of the compression coil spring, and when the operating pin is pulled out, the hammer moves along the inner circumference of the cylindrical housing due to the force of the compression coil spring, and the percussion cap is activated. The device collides with the solar cell, activating the thermal battery.

[Example] Hereinafter, the thermal battery of the present invention will be explained using an example shown in FIG.

In FIG. 1, the same reference numerals as in FIG. 2 indicate the same operating members. Further, the embodiment of the present invention has almost the same configuration as that in FIG. 2, but in the embodiment of the present invention, the housing 10 is cylindrical, the torsion coil spring 13 is replaced with a compression coil spring 15, and the hammer 11 is also cylindrical. The compression coil spring 15 is held by the spring holder 1, and will not operate if the operating pin 14 is attached.
Hold hammer 11. Housing 10, hammer 11
A hole into which the operating pin 14 can be inserted is provided in each of the spring retainers 16. The position of this hole is such that the compression coil spring 15 stores enough energy to ignite the percussion cap 3. The spring holder 16 is attached to the housing 10 after inserting the hammer 11 and the compression coil spring 15 into the housing 10 when assembling the external igniter.
After that, the hammer 11 is pulled out, the holes are aligned, and the operating pin 14 is attached. The operating principle of this embodiment of the present invention is similar to that of a conventional hammer-type thermal battery using a torsion coil spring. When the operating pin 14 is pulled out in the direction of the battery, the hammer 11 collides with the percussion cap 3 by the force of the compression coil spring 15. and activates the thermal battery.
However, in the embodiment of the present invention, the hammer 11 moves along the inner periphery of the housing 10, and after colliding with the percussion cap 3, there is no difference from the conventional method of operation. Although it is preferable from the viewpoint of reliability that the housing 10 is integrated with the battery case 1 by arc welding, it is necessary to maintain the position where the hammer 11 collides with the center of the percussion cap 3. For example, it is not necessarily necessary to integrate the housing 10 and the battery case 1 by welding or the like.

As is clear from FIG. 1, in the embodiment of the present invention, the housing 10 of the igniter has a cylindrical shape, so that it does not protrude beyond the battery diameter of the thermal battery. Further, since the hammer 11 is arranged inside the housing 10, it is possible to arrange various electrical parts in close contact with the bottom surface of the thermal battery and the housing 10, as long as there is no problem with pulling out the operating pin 14. In comparison, there is less confusion about where to place the thermal battery.

[Effects of the Invention] As described above, in the thermal battery of the present invention, the igniter does not protrude from the diameter of the battery, and various electrical components can be placed at the bottom of the battery. It has excellent advantages such as not having to be placed in a limited place.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the thermal battery of the present invention, and FIG. 2 is a longitudinal sectional view showing an example of a conventional thermal battery of this type. 1... Battery case, 3... Percussion detonator, 10...
Housing, 11... hammer, 14... operating pin,
15...Compression coil spring.

Claims (1)

[Claims] 1. In a thermal battery in which a percussion detonator 3 is attached to a battery case 1, a cylindrical housing 10 is disposed on the surface of the battery case 1 having the percussion detonator 3, and the housing 10 has a hammer 11 and a hammer 11 inside. It has a compression coil spring 15, an operating pin 14, and a spring holder 16, the spring holder 16 is arranged at the end of the housing 10 that is not in contact with the battery case 1, and the hammer 11 is arranged along the inner surface of the housing 10. The compression coil spring 15 is disposed between the hammer 11 and the spring holder 16, and the actuating pin 14 is arranged so that the hammer 11 can be moved into contact with the compression coil spring 15. It is inserted into holes provided in the housing 10, the spring holder 16, and the hammer 11 to hold it so that it does not move. A thermal battery characterized by: