JPH0536424A - Manufacture of thermal battery - Google Patents

Abstract

PURPOSE:To provide a thermal battery stabilized in voltage build-up by preventing the fall of a fuse band and uniforming the contact state between the fuse band and an electromotive part laminated body. CONSTITUTION:A fuse agent is dispersed into an organic solvent, and directly applied to an electromotive part laminated body 1. Thereafter, drying is conducted, whereby a fuse band is formed.

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. By burning the electrolyte, the electrolyte is heated to be in a molten state with good electrical conductivity, and electric power can be supplied to the outside.

As a starting mechanism for a thermal battery, an electric ignition type using an ignition ball and a hammer type using a percussion primer have been put into practical use.

Such a thermal battery has the following features and has been put to practical use as a power source for flying objects or an emergency power source. (1) Can be stored for more than 10 years. (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.

In recent years, there has been an increasing demand for quick start-up of thermal batteries, and Zr is formed on the side surface of the electromotive section in order to quickly and reliably convey the fire of the ignition ball or the detonator to the heating element of the electromotive section.
/ A Ba Cr O ₄ system of a sheet-like fuse agent fixed with heat resistant tape is used as a fuse wrap.

FIG. 2 shows a conventional method of installing the squib 15 in which two heat-resistant tapes 16 are usually placed on the electromotive section laminate 1 in a cross shape and four squibs 15 are Each of them was placed on the heat-resistant tape 16 at a position corresponding to the side surface of the electromotive section laminate 1, the heat-resistant tape 16 was bent, and fixed on the top surface of the electromotive section laminate 1 by turning.

[0007]

However, due to the handling of such a squib, (1) the squib is likely to fall off during manufacturing (most of them are heat-resistant during or after bending the heat-resistant tape). It was caused by slackening of the tape). (2) It is difficult to ensure a uniform state of contact between the ignition zone and the electromotive section laminate. However, the ignition time of the heating element is likely to vary during operation of the thermal battery, and the voltage rise may not be stable and may be delayed due to discharge performance.

[0008]

In the thermal battery of the present invention, a flame retardant is dispersed in an organic solvent and directly applied to the electromotive section laminate,
It is characterized by forming a fire zone by drying.

[0009]

In the present invention, since the detonating agent dispersed in the organic solvent is directly applied to the electromotive section laminate and dried, the thickness of the detonating zone can be reduced, which prevents the dropping off during production.
Since the state of contact with the electromotive section laminate can be improved, the fire of the ignition ball or the percussion primer can be quickly and reliably transmitted to the heating element of the electromotive section. As a result, the voltage rise can be stabilized in terms of discharge performance.

[0010]

EXAMPLE An example in which the present invention is applied to a lithium-based thermal battery will be described below.

Generally, the structure of a lithium-based thermal battery has a structure as shown in FIG. In the figure, the electromotive section laminate 1 is configured by alternately stacking the unit cells 2 and the heating elements 3, and connects an arbitrary number of unit cells 2 in series so as to be able to supply a predetermined voltage as a whole. Has been done.

The unit cell 2 has a positive electrode layer made of iron sulfide or the like,
It is composed of a separator layer made of a molten mixture and the like, a three-layer pellet of a negative electrode layer made of a lithium alloy and the like, and a current collector plate. The heating element 3 is made of iron and potassium perchlorate.

The 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 ball 4 ignites and causes the heating element 3 to burn through the firing hole 14 and the firing zone 15,
Due to this heat generation, the unit cell 2 operates and enters a state in which electric power can be supplied to the outside.

The output terminal 6 is connected to the electromotive section laminate 1 via a lead wire 10. Reference numeral 11 is an insulator, and 12 is a heat insulator, and mica, ceramic fiber and the like are used respectively. 1
A battery case 3 is welded to the battery cover 5 and has a hermetically sealed structure. In the case of calcium-based thermal battery, unit cell 2
The configuration is the same as the above except that it is replaced with a positive electrode layer made of calcium chromate or the like, a two-layer pellet made of a separator layer made of a molten mixture or the like, and a negative electrode layer made of a calcium plate.

FIG. 1 shows a method for installing a fire zone 15 in an electromotive section laminate 1 according to the present invention, in which a flame-retardant agent uniformly dispersed in an organic solvent is used with a brush. The composition is directly applied to No. 1 and then allowed to stand and dry at room temperature. Then, after drying, the heat insulating body 12 is wrapped around to fix the flame guide agent.

As the organic solvent, it is necessary to use a solvent that is liquid and volatile at room temperature and is not reactive with calcium and lithium such as tetrahydrofuran.

As a result, the work is simplified, and moreover, it is possible to prevent the squib 15 from dropping off during manufacture.

[0018]

As described above, according to the present invention, a fire of an ignition ball or a percussion primer can be swiftly and surely maintained in the electromotive section with almost no change in structure, manufacturing process and the like from the conventional thermal battery. Since it can be transmitted to the heating element, it is possible to provide a highly reliable thermal battery capable of stabilizing the voltage rise in terms of discharge performance.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a method for setting a fire zone according to the present invention.

FIG. 2 is a diagram showing a conventional method of setting a fire zone.

FIG. 3 is a vertical cross-sectional view showing the configuration of the entire thermal battery.

[Explanation of symbols]

1 Electromotive section laminate 15 fire zone 16 Heat-resistant tape

Claims (2)

[Claims] 1. A plurality of unit cells and a heating element are alternately laminated to form an electromotive section laminate, and then a flame retardant dispersed in an organic solvent is applied to the outer periphery of the electromotive section laminate. A method for manufacturing a thermal battery, which comprises a step of applying on a side surface and drying to form a flame zone. 2. The thermal battery according to claim 1, wherein the organic solvent is a solvent which is liquid and volatile at room temperature without reacting with calcium and lithium such as tetrahydrofuran, and is dried naturally. Production method.