JPH02281566A - Thermal cell - Google Patents

Abstract

PURPOSE:To enhance the reliability and reduce the cost of a thermal cell by providing a cell lid with an ignition opening and arranging an ignition device, and sealingly welding the ignition device integrally with the cell lid. CONSTITUTION:The welding portion 12 of a cell lid 1 is welded to a cell case. Thereafter, an ignition device 11 comprising an igniter 7 and an igniter lid 10 to which ignition terminals 8, 9 each made of a hermetic seal is fixed is arranged at an opening 6 provided through the igniter mounting projecting portion of the cell lid 1 and is sealingly welded thereto together with the cell lid 1. Thus an initially selected igniter is used so that the reliability of the cell is enhanced, a heat insulating material for the lid portion is simplified and the manufacturing process is shortened, for cost reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to an improvement in the structure of attaching an igniter to the battery lid of a stacked lithium/iron disulfide thermal battery.

BACKGROUND TECHNOLOGY Thermal batteries are inactive at room temperature, but become active when heated to high temperatures, making them capable of supplying power to the outside world, and are a type of storage battery. Therefore, even after storage for 6 to 10 years or more, the battery characteristics remain the same as they were immediately after manufacture, so they are used as an emergency power source. In addition, since it is operated at high temperatures, electrode reactions can easily proceed, so there is little polarization, so it has excellent large current discharge properties, and when desired, it has features such as instantaneous power extraction when a start signal is input.

However, the conventional structure using an electric igniter has the disadvantage that if the igniter malfunctions for some reason, the battery case must be cut off and repaired, or disposed of. There is.

In order to overcome this problem, research that has been carried out has been carried out in the past, as shown in Japanese Patent Publication No. 52-7981, in which the igniter is airtightly isolated from the cell and the exothermic agent, Japanese Patent Publication No. 47-31174 proposed a structure in which a battery case is formed airtight, and an exhaust device is activated in a part of the case at the same time as ignition. However, due to the activation method in which thin metal plates such as copper foil are ruptured by the flame and gas generated from the igniter, parts of the stack may be short-circuited due to blown fragments, and the overall structure may become complicated. It was impractical for this reason.

Therefore, in order to facilitate the replacement of a malfunctioning igniter and improve the reliability of 1-operation, we devised the shape of the battery lid mentioned above, and in addition to improving the above-mentioned defects, we also simplified the shape of the lid insulation material and simplified the process. Attempts were made to improve the reliability of the zero igniter. An example of this will be explained below with reference to FIG.

31 is the lid body made of stainless steel, and 32 and 33 are a pair of output terminals made of hermetic seals.

The inner pin and the stack lead wires 34 and 35 are electrically connected by spot welding. The same pair of ignition terminals 37 and 38 to which the igniter 36 is connected, and the output terminal 3
2.33 is fixed to the lid body with a sealed glass.

In such a conventional structure, if the battery case 39 and the welded part 4o are integrally processed, if the igniter fails, the battery case must be cut, which requires a large amount of reprocessing work and is not reliable. There were drawbacks such as a decrease in performance.

Problems to be Solved by the Invention In the structure disclosed in Japanese Patent Publication No. 52-7981, one igniter is installed after the battery is completed.

Although it is easy to replace even in the event of a failure, the separator in a blocked state is easily destroyed by the flame and gas pressure of the igniter and flame generator, improving the reliability of igniting the exothermic agent. ,
The disadvantage is that scattered pieces of the separator plate tend to cause local short circuits.

In addition, Japanese Patent Publication No. 47-31174 has a structure in which when the metal thin film is deformed by the internal pressure of the battery, it is broken with a nail, puncher, etc. to release gas, but the igniter is in contact with the heating element, and only one igniter is needed. In terms of maintenance in the event of a breakdown, the battery case would have to be cut off, just like before, making it impractical.

The present invention solves the conventional problems as described above.

To provide a thermal battery that can improve the reliability of an igniter, is relatively easy to replace even in the unlikely event of a defect, is easy to manufacture, and has a simplified shape of a heat insulating material in a lid part. The purpose is to

Means for Solving the Problem In order to solve this problem, the present invention provides a battery case in which a battery cover with an output terminal attached is fitted into a battery case that includes a stack part in which unit cells and exothermic pellets are laminated, and a cover insulating material. To attach the output terminal, insert the igniter cover with the electric igniter attached to the pair of starting terminals into the igniter opening provided on the convex part of the surface, and then connect the battery cover and the igniter cover. It has a structure that is integrally welded and sealed.

According to this configuration, the igniter is installed in the final process after the battery is completed, so products that have passed reliability tests can be used and internal short circuits due to separators can be prevented, improving the reliability of the igniter and reducing・It also becomes easier to handle the failure of -. In addition, the shape of the lid insulation material installed between the stack part and the battery lid is simplified.

Adoption of this structure does not involve any technical difficulties, as it is possible to reduce the number of parts and manufacturing man-hours. Therefore, a thermal battery that is easy to manufacture and has excellent reliability can be constructed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Figure 1 shows the separation structure of the battery cover and ignition device.

In the figure, 1 is the battery cover, 1 has a protruding structure for mounting the igniter, and 2 is the output terminal made of a hermetic seal.
．． 3 and is electrically connected to the stack lead wire 4.6 at the tip of the terminal inside the battery. Reference numeral 6 denotes an igniter opening in which an igniter 11 consisting of an igniter lid 1o to which an igniter 7 and a pair of ignition terminals 8.9 each made of a hermetically sealed terminal are fixed is arranged. Reference numeral 12 denotes a welded portion of the battery lid, which is a portion that fits into the battery case.

Figure 2 is a cross-sectional structural diagram of a stacked thermal battery using the present invention.
13 is lithium or lithium alloy (Limul, I
, isi, etc.), 14 is LiCJ-KOII (4
7:53% by weight, melting point 362°C) and magnesium oxide (
The electrolyte layer of the mixed molded body of MgO), 16 is iron disulfide (F
ed2) and a positive electrode layer made of the electrolyte material described above, this is a unit cell 16 with a diameter of 76 cm, which is made up of these three layers as one body. 1T is a heat generating agent pellet made of a mixture of iron powder and potassium perchlorate (88:12% by weight) made into a pellet by pressure molding, and is arbitrarily laminated alternately with unit cells 16 to form a stack part 18. .

Reference numeral 19 denotes a heat storage layer, which is a layer in which, for example, molten salt of lithium sulfate and sodium chloride is melted and injected into a metal container and then sealed, and is placed above and below the stack. Reference numeral 20 denotes a heat pad which is combusted by the flame of the igniter T, and the combustion is further propagated to the fuse cord 21. Reference numerals 2 and 3 denote a pair of power output terminals to which lead wires drawn out from the upper and lower parts of the hook part 18 are connected, respectively. 2
2 is a bottom insulation material, 23 is a cylindrical insulation material, and 24 is a lid insulation material, which is an inorganic insulation material such as SiO□ or TiO2. The number of parts has been reduced without creating a complicated shape due to terminals.

26 is a battery case, and the fitting part with the battery cover welding part 12 is T.
Completely airtight with IG welding. 26 is the welded part of the ignition device, which is sealed by TIG welding or YAG welding.

To describe the starting order of this battery, first, when a current is applied from the ignition terminal 8.9 to the ignition terminal 50011 and 3115i, the igniter 7 emits a flame, which passes through the through hole in the lid insulation material and ignites the heat pad 20. , the heat pad 20 burns and further burns out to the fuse zone 21, ignites the exothermic pellets 17 in each layer one after another as the combustion propagates, and a combustion reaction occurs to generate electricity in the unit cell 16, heating and melting the heat storage layer 19. let The battery is about 2. IV/cell generates electricity, totaling 38
V is obtained and supplies power via output terminal 2.3.

Next, the effects of this embodiment will be described in comparison with the conventional example.

The table below shows a reliability comparison of one igniter.The conventional example was assembled into a battery and then subjected to vibration and shock tests, and the number of failures after vibration was applied, while the inventive example was tested after being subjected to vibration and impact tests.

After applying shock to remove the defective igniter and assembling the selected igniter into the battery, vibration and shock were applied in the same way as in the conventional example, and the number of malfunctions per 1000 batteries was shown. Recovery and repair time is a comparison of the time (per battery) required to install and repair a new igniter to a non-operating battery.

Effects of the invention As is clear from the above explanation, if the battery cover is provided with an opening for the igniter, the igniter is arranged, and the igniter is hermetically welded together with the battery cover, a pre-selected igniter can be used. I can,
In addition, the heat insulating material of the lid part can be simplified, furthermore, inoperable batteries can be easily recovered and repaired, and a thermal battery with high reliability and a low cost can be provided by simplifying the manufacturing process.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a separated state of the battery cover and ignition device in an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the entire stacked thermal battery of the present invention, and FIG. 3 is a conventional battery. It is a sectional view showing a lid. 1...Battery cover, 2.3...Output terminal,
6...Opening for igniter, 7...Igniter, 10...Ignition lid. 11...Ignition device, 16...Battery,
17... Heat generating agent pellets, 18... stack part, 24... lid insulation material, 26...
・Battery case. Name of agent: Patent attorney Shigetaka Awano and 1 other person1-
1 2.3-1177J Nishiki, 5---Stackle to Kurara c, -4 dog@y@opening 1D---Point number t tt-J:, Hong Jiao 1l ---) 1 Kenshu Shinhanshu + 5...-Zhenfu Layer ff-Ikhyo tA! 7-・-father-in-law 14Ik @ to Leh, 1 t0---Beat Ha'but 3I・-IL 淋H---, pipe, to!

Claims (1)

[Claims] In a battery having a lid insulation material between a stack part in which unit cells and exothermic pellets are laminated, and a battery lid, the battery lid in which an output terminal is attached to a battery case containing the stack part and lid insulation material is provided. Fitting and welding, and inserting an ignition device consisting of a pair of ignition terminals, an electric igniter, and an ignition lid into an igniter opening provided in a convex portion from the output terminal mounting surface,
A thermal battery whose battery cover and ignition cover are welded and sealed together.