JPH06215777A - Thermal cell - Google Patents

Abstract

PURPOSE:To make the handling of a thermal cell during storage easy and surely prevent the generation of erroneous activation by making an ignition apparatus be a detachable type and covering the ignition apparatus attachment and detachment part of a thermal cell main body with resin or a metal foil before attachement to keep air-tightness of the cell main body. CONSTITUTION:A screw part is formed in the ignition apparatus attachment and detachement part 14 of a thermal cell main body 20 and an ignition apparatus 15 can be attached by screwing the apparatus 15. Since the active material of the main body 20 is lithium or its alloy or calcium which is easily deteriorated by reaction with moisture in air, a thin coating of resin or a metal foil is formed on the attachment and detachment part 14 to keep air-tightness. When the apparatus 15 is attached, the thin coating is ruptured and by applying voltage to an ignition terminal 7, an igniting ball radiates heat and elemental calls are activated and thus electric power is supplied to outside. Since the apparatus 15 and the main body 20 can be manufactured and stored independently, assembly work is carried out efficiently without producing highly dangerous igniting ball during the manufacture of the main body 20 and at the same time erroneous activation during storage can be surely prevented.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in thermal batteries.

[0002]

2. Description of the Related Art A thermal battery is a battery that uses a molten salt as an electrolyte, and the electrolyte is a non-conductive solid salt during storage and cannot supply electric power to the outside. Combustion activates, that is, heats the electrolyte to bring it into a molten state with good electrical conductivity, so that electric power can be supplied to the outside.

Such a thermal battery can be stored for (1) 10 years or more. (2) High-power discharge is possible because active materials with high activity such as calcium, magnesium, and lithium can be used. (3) Can be used in a wide temperature range of -55 to + 75 ° C. (4) Strong against vibration and shock. It has the characteristics described above, and has been put to practical use as a power supply for flying vehicles or an emergency power supply.

Next, the structure of a general thermal battery will be described with reference to FIG.

In the figure, reference numeral 1 is a laminate of electromotive parts, and a unit cell 2
And heating elements 3 are alternately laminated, and an arbitrary number of unit cells 2 are connected in series or in parallel so that a predetermined voltage can be supplied as a whole. A battery cover 5 is provided with an output terminal 6 and an ignition terminal 7 via an insulating glass 8. The ignition terminal 7 is connected to the ignition ball 4 via a lead wire 9. When a predetermined current is applied to the ignition terminal 7, the ignition ball 4 ignites and causes the heating element 3 to burn. Is activated so that electric power can be supplied to the outside. Further, the output terminal 6 is connected to the electromotive section laminate 1 via the lead wire 10. Reference numeral 11 is an insulator, and 12 is a heat insulator, and asbestos, mica, ceramic fibers, etc. are used respectively. 13 is a battery case, and the battery cover 5
It is welded with and the inside has a closed structure.

[0006]

Since the thermal battery is a primary battery, it can be used only once. That is, if a voltage is mistakenly applied between the two ignition terminals 7 during storage or the like, the terminals are activated and cannot be used again after that.

Therefore, in order to prevent such false activation, the two ignition terminals 7 are short-circuited during storage,
It was necessary to handle the ignition terminal 7 carefully so that no voltage was applied to it.

Further, since the ignition ball itself easily burns explosives and the like, it is necessary to always handle it with care in the process of manufacturing the thermal battery.

[0009]

According to the present invention, an ignition device having an ignition ball which is conventionally incorporated inside is made detachable.
By removing the ignition device during manufacture of the thermal battery main body or during storage and mounting the ignition device at the time of use, handling during storage is simplified and malfunction is reliably prevented.

If the ignition device attaching / detaching portion of the thermal battery main body is exposed, the active material is exposed to the outside air and the active material deteriorates. Therefore, the portion is made airtight with resin or metal foil. Is.

[0011]

1 is a perspective view of a thermal battery main body and an ignition device according to the present invention, FIG. 2 is a vertical sectional view showing the structure of the thermal battery main body according to the present invention, and FIG. 3 is an ignition device used for the thermal battery of the present invention. 3 is a vertical cross-sectional view showing the structure of FIG.

Since the structure of the thermal battery main body shown in FIG. 2 is the same as that of the conventional thermal battery except for the ignition device attaching / detaching portion 14, only the vicinity of the ignition device attaching / detaching portion 14 will be described.

The battery cover 5 is provided with a screw for attaching / detaching the ignition device, and the ignition device 15 shown in FIG.

The ignition device 15 and the thermal battery main body 20 can be manufactured and stored separately, and are mounted and used as shown in FIG. 1 when necessary. Therefore, when manufacturing the thermal battery main body, since the ignition ball having a high risk of ignition is not handled, the assembling work can be performed more efficiently. Further, it is possible to effectively prevent erroneous activation during storage.

Since the active material of the thermal battery uses a material such as lithium or its alloy or calcium which easily reacts with moisture in the air and deteriorates, the ignition device attaching / detaching portion 14 must be shielded from the atmosphere. Therefore, the portion 14 has a structure in which the thin film 17 is formed of resin or metal foil to keep the thermal battery main body airtight.

In FIG. 3 showing an example of the ignition device, 1
A cover 6 is provided with an ignition terminal 7, and the ignition terminal 7 is connected to the ignition ball 4 by a lead wire 9. Reference numeral 19 is a heat insulator for insulating and protecting the ignition ball.

Reference numeral 18 is a metal cover for breaking the thin film 17 when the ignition device 15 is attached to the thermal battery main body 20. Since the thin film is burned by the flame of the ignition ball at the time of ignition, the metal cover 18 is not always necessary, but it is preferable to provide the metal cover 18 in order to more surely burn the heating element 3 at the time of ignition.

[0018]

According to the present invention, it is possible to prevent the occurrence of erroneous activation without handling the ignition ball during manufacturing, simplifying the handling during storage.

[Brief description of drawings]

FIG. 1 is a perspective view of a thermal battery main body and an ignition device according to the present invention.

FIG. 2 is a vertical sectional view showing an example of the structure of the thermal battery main body of the present invention.

FIG. 3 is a vertical cross-sectional view showing an example of the structure of the ignition device of the present invention.

FIG. 4 is a vertical cross-sectional view showing a conventional thermal battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromotive part laminated body 4 Ignition ball 14 Ignition device attaching / detaching part 15 Ignition device 20 Thermal battery main body

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[Procedure amendment]

[Submission date] January 21, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (1)

[Claims] 1. A thermal battery having a removable ignition device,
Before mounting the ignition device, the thermal battery is characterized in that the attaching / detaching portion of the ignition device provided on the main body of the thermal battery is covered with resin or metal foil to keep airtightness.