JPH0757777A - Manufacture of sodium-sulfur battery thermo-compression bonding part - Google Patents

Abstract

PURPOSE:To obtain a sodium-sulfur battery thermal pressure contact part having a U-like groove easily by bonding a material, which is obtained by pinching a high melting point insert material with low melting point insert material at a width wider than that of the high melting point insert material, as an insert material. CONSTITUTION:A solid electrolyte tube 1 is surrounded by a positive electrode tube 4, and an insulating ceramic ring 3 is solder-connected to an open end of the tube 1. A negative electrode flange 1a made of metal and a positive electrode flange 4a made of metal are bonded to this ring 3 so as to pinch the ring 3 at the upper and the lower surfaces of the ring 3. This bonding is performed by arranging an insert material 2 between the negative electrode flange 1a - the ring 3 and the positive electrode flange 4a - the ring 3, and performing the thermal pressure contact. A material, which is obtained by pinching a high melting point insert material 2b between low melting point insert materials 2a having a width longer than that of the high melting point insert material 2b, is used as an insert material, and bonding is performed by heating this insert material at a temperature for melting only the low melting point insert material and pressurizing and holding it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hot-pressed portion of a sodium-sulfur battery having a U-groove, and for obtaining high strength and high airtightness at a joint portion between a positive or negative electrode flange and an electrically insulating ceramic ring. The present invention relates to a method for manufacturing a hot press contact portion of a sodium-sulfur battery having a suitable U groove.

[0002]

2. Description of the Related Art Conventionally, in a sodium-sulfur battery thermal pressure welding part, a residual thermal stress due to a difference in thermal expansion between metal and ceramics is applied to a joint part between a positive or negative electrode flange and an electrically insulating ceramics ring after the thermal pressure welding or after heating / cooling. Therefore, there was a problem that cracks were generated and the airtightness and the bonding strength were lowered. As a method of solving this problem, U-groove processing is applied to the end of the insert material, and as a method thereof, a method of using an insert material having U-groove processing applied to the end in advance and a method of heat-pressing a semi-elliptical split jig are used. A method which is sometimes used to form a U-groove in an insert material is described in JP-A-5-3049.

[0003]

As described in Japanese Patent Laid-Open No. 5-3049, when an insert material having a U groove formed in advance at the end is used, the pressure applied at the joining end during hot pressure welding is As a result, there is a new problem that the joint strength of the joint ends decreases. Further, in the method of making a U-groove on the insert material by using a semi-elliptical splitting jig at the time of hot-pressing, there is a problem that the insert material and the jig react at the time of hot-pressing and it is difficult to form a desired shape.

An object of the present invention is to provide a method for manufacturing a hot-pressed portion of a sodium-sulfur battery, which can easily and effectively form a U groove in the hot-pressed portion.

[0005]

The above object can be achieved by using a low melting point insert material having a width wider than that of the high melting point insert material and sandwiching the high melting point insert material as the insert material to perform the joining.

[0006]

With the above-described joining, the U-groove can be easily formed at the end of the joining insert material.

[0007]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a sodium-sulfur battery. The solid electrolyte tube 1 is surrounded by the positive electrode tube 4, and the solid electrolyte tube 1
A ceramic ring 3 is solder-bonded to the open end for electrical insulation. Also, the ceramic ring 3
The metal negative electrode flange 1a and the positive electrode flange 4a are joined to the upper and lower surfaces different from the joining surface so as to sandwich the ceramics ring 3 therebetween. This joining is performed by arranging the insert material 2 between the negative electrode flange 1a and the ceramics ring 3 and between the positive electrode flange 4a and the ceramics ring 3 and thermocompressing them. 2 and 3 show the joint portion between the ceramic ring 3 and the negative electrode flange 1a or the positive electrode flange 4a. In this way, the joint surface of the insert material edge and the positive or negative flange, and the ceramic ring should be smooth,
Alternatively, by forming a U groove so that the end portion of the insert material is thin, a joint surface having excellent strength and airtightness can be obtained. FIG. 4 shows a method for achieving this, in which a low melting point insert material 2a sandwiching the high melting point insert material 2b, which is longer than the width of the high melting point insert material 2b, is used as an insert material and has a low melting point. It becomes possible by joining by heating and maintaining pressure at the temperature at which only the material melts.

(Embodiment 2) As a method for realizing FIG. 2, a method of machining with a turning tool having R after hot pressure welding is also possible.

(Embodiment 3) FIG. 5 shows a method of joining a positive or negative flange with a high-melting point insert material and a U-groove at the joining end thereof using a low-melting point insert material 2a. The heat-pressure-welded portion thus joined is also used in Example 1,
Similar to 2, a joint surface with excellent strength and airtightness can be obtained.

[0011]

EFFECTS OF THE INVENTION According to the method for manufacturing the hot press contact portion of the sodium-sulfur battery of the present invention, the U groove can be easily formed at the joint portion, and the heat of the sodium-sulfur battery having excellent strength and airtightness can be obtained. A press contact part is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sodium-sulfur battery.

FIG. 2 is a cross-sectional view of a heat press contact portion for explaining the present invention.

FIG. 3 is a cross-sectional view of a heat press contact portion for explaining the present invention.

FIG. 4 is an explanatory diagram for realizing the present invention.

FIG. 5 is an explanatory diagram for realizing the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Anode cap, 1a ... Anode flange, 2 ... Insert material, 2a ... Low melting point insert material, 2b ... High melting point insert material, 3 ... Ceramics ring, 4 ... Positive electrode tube, 4a ...
Positive electrode flange, 5 ... Solid electrolyte tube, 6 ... Negative electrode terminal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshimi Sato 502 Jinritsucho, Tsuchiura City, Ibaraki Pref., Institute of Mechanical Research, Hiritsu Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A positive or negative metal flange is arranged on the other surface of an electrically insulating ceramic ring joined to the open end of a solid electrolyte tube having sodium ion conductivity.
Sodium-sulfur having a U-groove with a circular or elliptical shape at the end of the insert material of the sodium-sulfur battery thermocompression-bonding part, which is heated and pressed between the ceramics ring and the positive or negative electrode flange via an insert material. In the method for manufacturing a battery heat-bonded portion, a sodium-sulfur battery heat-bonded portion characterized in that a low-melting point insert material wider than the high-melting point insert material and sandwiching the high-melting point insert material is used as the insert material. Manufacturing method. 2. When a positive or negative flange and an electrically insulating ceramics ring are joined using an insert material in the method for producing a hot-pressed portion of a sodium-sulfur battery, R after joining is used.
A method for manufacturing a sodium-sulfur battery thermocompression-bonded portion, characterized in that an end portion of the insert material is machined into a circular or elliptical U-groove with an attached tool. 3. A sodium-sulfur battery hot press contact part manufacturing method, wherein when a positive or negative electrode flange and an electrically insulating ceramics ring are joined using an insert material, the positive or negative electrode flange is made of a material equivalent to a high melting point insert material. , Using a U-groove with a circular or elliptical shape at its joint,
A method for producing a sodium-sulfur battery thermocompression-bonded portion, which comprises joining using a low melting point insert material as an insert material.