JP3315937B2 - Stainless steel cap for hot pressure bonding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel cap used for hot-press bonding between an insulating ring and an anode in a sodium-sulfur battery.

[0002]

2. Description of the Related Art A sodium-sulfur battery has molten metal sodium as a cathode active material on one side and molten sulfur as an anode active material on the other side, and both have selective permeability to sodium ions. This is a high-temperature secondary battery operated at 300 to 350 ° C. isolated by a β-alumina solid electrolyte.

As shown in FIG. 17, for example, such a sodium-sulfur battery has a cylindrical anode container 9 containing molten sulfur S impregnated in carbon felt or the like, and a molten metal inside the anode container 9. It has a bottomed cylindrical solid electrolyte tube 11 that contains metallic sodium Na and has a function of selectively transmitting sodium ions Na ⁺ .

The solid electrolyte tube 11 is connected to an anode container 9 via an insulating ring 3 made of α-alumina and an anode fitting 5. The anode fitting 5 has a cylindrical portion and a flange portion provided at a lower end of the cylindrical portion. The insulating ring 3 is inserted into the cylindrical portion of the anode fitting 5, and the upper surface of the flange of the anode fitting 5 is hot-pressed to the lower end surface of the insulating ring 3. Further, a cathode fitting 1 is provided on an upper end surface of the insulating ring 3.
3 are joined, and a cathode lid 15 is fixed to the cathode fitting 13 by welding. An anode terminal 17 and a cathode terminal 19 are provided on the outer peripheral upper portion of the anode container 9 and the upper surface of the cathode lid 15, respectively.

In the sodium-sulfur battery having such a structure, at the time of discharge, sodium Na permeates through the solid electrolyte tube 11 as sodium ions and reacts with sulfur S in the anode container 9 and electrons passing through the external circuit. To produce sodium polysulfide. At the time of charging, a reaction of forming sodium and sulfur occurs in reverse to discharging.

Conventionally, the heat and pressure bonding between the insulating ring 3 and the anode fitting 5 is performed as shown in a partially enlarged sectional view of FIG.
The insulating ring 3 was inserted into the cylindrical portion 5a of the anode fitting 5 and placed on the flange 5b, and the stainless steel cap 1 was attached to the lower part of the anode fitting 5, set on the jig 7, and heated to a predetermined temperature. Thereafter, the pressure is applied from above the insulating ring 3. The stainless steel cap 1 is made of a stainless steel plate (SUS304 or S
US304L) by press molding, as shown in FIG. 15, a cylindrical portion 1a and the cylindrical portion 1a.
And a flange portion 1b projecting inward from the lower end of the flange.

[0007] At the time of hot-pressure bonding, such a stainless steel cap 1 is attached to the lower part of the anode metal fitting 5 because the heat-pressure bonding is performed when the anode metal fitting 5 is directly in contact with the jig 7. This is because the jig 7 is easily adhered, and it is difficult to remove the anode fitting 5 from the jig 7 after the heat and pressure bonding.

[0008]

By the way, when the heat and pressure bonding is performed as described above, as shown in FIG. 13, the thickness of the flange portion 5b of the anode fitting 5 is reduced by pressurization and the arrow B Direction, and the lower part of the cylindrical portion 5a extends in the direction of arrow A, so that the height dimension h of the anode fitting 5 increases. Therefore, it is difficult to make the height dimension h of the anode fitting 5 uniform over the entire circumference of the anode fitting 5 after joining.

The cause is considered as follows. That is, in the heat-pressure joining, if heating before pressurization is performed, the stainless cap thermally expands. However, as shown in FIG. Expansion is hindered, and particularly large deformation occurs in the flange portion 1b. Due to this deformation, the flange portion 1b of the stainless steel cap 1 is inclined with respect to the lower surface of the flange portion 5b of the anode fitting 5, and the magnitude of this inclination is not uniform over the entire circumference of the stainless steel cap 1. Even if pressure is applied in such a state, the anode fitting 5 cannot be pressed uniformly. As a result, as described above, the elongation of the cylindrical portion 5a in the direction of arrow A in FIG. 13 becomes non-uniform, and the height dimension h on the entire circumference of the anode fitting 5 after bonding varies.

After the heat and pressure bonding, as shown in FIG. 16, the upper part of the anode fitting 5 is joined to the upper part of the anode container 9 by beam welding, but the height of the anode fitting 5 is uneven as described above. If there is, there is a problem that a gap c is formed in a welded portion between the anode fitting 5 and the anode container during welding, which causes poor welding. Specifically, when the difference between the maximum value and the minimum value of the height dimension h in the entire circumference of the anode fitting 5 is 0.5 mm or more, welding becomes difficult. This problem has become apparent as the size of the sodium-sulfur battery has increased, and the stainless steel cap used for the thermocompression bonding has a cylindrical portion having an inner diameter of 70 mm or more.
It is prominent in the manufacture of sulfur batteries.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide an anode metal fitting in a hot-press bonding between an insulating ring of a sodium-sulfur battery and an anode metal. It is an object of the present invention to provide a stainless steel cap for thermocompression bonding that can uniformly pressurize and suppress variations in the height of the entire circumference of the anode fitting after thermocompression bonding.

[0012]

According to the present invention, when the flange portion of the anode fitting having the cylindrical portion and the flange portion provided at the lower end of the cylindrical portion is hot-press bonded to the insulating ring. A hot-pressure joining stainless steel cap to be used by being attached to a lower portion of the anode fitting, the hot-pressure joining stainless steel cap having a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, A stainless steel cap for thermocompression bonding (first invention), characterized in that the material has a coefficient of thermal expansion of 15 × 10 ⁻⁶ / ° C. or less.

According to the present invention, when the flange portion of the anode metal fitting having the cylindrical portion and the flange portion provided at the lower end of the cylindrical portion is hot-press bonded to the insulating ring, A stainless steel cap for hot-pressure joining used by being attached to the lower part of a cylinder, the hot-pressing stainless steel cap having a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and a micro material of the material. Vickers hardness (MHv) is 150 or less, a stainless steel cap for hot-pressure bonding (second invention),
Is provided.

Further, according to the present invention, when the flange part of the anode metal part having the cylindrical part and the flange part provided at the lower end of the cylindrical part is hot-press bonded to the insulating ring, A stainless steel cap for hot-pressure joining used by being attached to a lower part of the cylindrical portion, the hot-pressing stainless steel cap having a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and from the cylindrical portion. The radius of curvature of the bent part that shifts to the flange part is 0.40 to 0.6
A stainless steel cap for thermocompression bonding (third invention), characterized in that the cylindrical portion is set to 0R and the cylindrical portion is curved inward.

Further, according to the present invention, when the flange portion of the anode fitting having the cylindrical portion and the flange portion provided at the lower end of the cylindrical portion is hot-press bonded to the insulating ring, A stainless steel cap for heat and pressure bonding used by being attached to a lower part of a metal fitting, the stainless steel cap for heat and pressure bonding has a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion. The coefficient of thermal expansion is 15 × 10 ⁻⁶ / ° C. or less, the micro-Vickers hardness (MHv) is 150 or less, and the radius of curvature of the bent portion transitioning from the cylindrical portion to the flange portion is 0.40 to 0.6.
A stainless steel cap for thermocompression bonding (fourth invention), characterized in that the cylindrical portion is curved inward while having a value of 0R.

[0016]

First, a first invention will be described. A first invention is a stainless steel cap for thermocompression bonding having a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and has a thermal expansion coefficient of 15 ×.
It is characterized in that it is not more than 10 ⁻⁶ / ° C., preferably not more than 11 × 10 ⁻⁶ / ° C. Conventionally, SUS304 and SUS, which have been mainly used as materials for stainless steel caps for thermal pressure bonding
Since the coefficient of thermal expansion of 304L is 17 × 10 ⁻⁶ / ° C., the material used in the first invention has a considerably smaller coefficient of thermal expansion than the conventional one.

As described above, by using a material having a small coefficient of thermal expansion, it is possible to suppress the thermal expansion of the stainless steel cap and the resulting deformation of the flange portion in the process of increasing the temperature before pressurization in the thermal pressure bonding. As a result, in the pressurization process of the thermal pressure bonding, the pressing pressure applied to the anode fitting approaches uniformity, and the variation in height around the entire circumference of the joined anode fitting can be reduced.

In the first invention, as the stainless steel having a thermal expansion coefficient of 15 × 10 ⁻⁶ / ° C. or less used for the material of the stainless steel cap, for example, the thermal expansion coefficient is 10 × 1
0 ^-6 ~11 × 10 ^-6 / ℃ a is SUS403 or the like ferritic stainless, thermal expansion coefficient is that 5 × 10 ^-6 / ℃ Kovar (Fe-29Ni-17Co), the thermal expansion coefficient of 1.2 × Invar (Fe-36Ni) at 10 ⁻⁶ / ° C.
Is mentioned.

Next, the second invention will be described. Second
Similarly to the first invention, the invention is also a stainless steel cap for hot-pressure joining having a cylindrical portion and a flange portion projecting inward from the lower end of the cylindrical portion. The material has a micro Vickers hardness (MHv) of 150. The features are as follows. The micro Vickers hardness in the present invention is based on a value measured according to JIS Z-2244 / JIS B7734 (load: 300 gr).

FIG. 1 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in a thermocompression bonding using a stainless steel cap made of a material having a micro Vickers hardness of 150 or less according to the second invention. FIG. 2 is a partially enlarged cross-sectional view showing a state before pressing to a predetermined temperature in a conventional hot-press bonding using a stainless steel cap made of a material having a micro Vickers hardness exceeding 150.

As shown in FIG. 2, when a stainless steel cap 1 made of a material having a micro Vickers hardness exceeding 150 is used, the flange portion 1 b is deformed and a large inclination is generated with respect to the lower surface of the anode fitting 5. At the same time, the inclination is uneven over the entire circumference of the flange portion 1b,
When pressure is applied in this state, the anode metal 5 is not uniformly pressed, and a large variation occurs in the height of the entire circumference of the anode metal 5 after bonding.

On the other hand, as shown in FIG. 1, when a stainless steel cap 1 made of a material having a micro Vickers hardness of 150 or less is used, the lower surface of the anode fitting 5 and the upper surface of the flange portion 1b are formed over the entire circumference. Since the anode metal members 5 are substantially parallel to each other, the anode metal members 5 are uniformly pressed, so that variations in the height of the entire circumference of the joined anode metal members 5 can be reduced.

In the second invention, the stainless steel having a micro Vickers hardness of 150 or less used for the material of the stainless steel cap is preferably one obtained by annealing a stainless steel plate to remove stress and softening to a predetermined micro Vickers hardness.

Subsequently, the third invention will be described. Similarly to the first and second inventions, the third invention is also a stainless steel cap for hot-pressure joining having a cylindrical portion and a flange portion projecting inward from the lower end of the cylindrical portion, but shifts from the cylindrical portion to the flange portion. The radius of curvature of the bent part is 0.40
It is characterized in that it is 0.60R and the cylindrical portion is curved inward.

4 to 6 are partially enlarged sectional views showing the shape of a conventional stainless steel cap. In a conventional ordinary stainless steel cap, the cylindrical portion 1a is inclined inward or outward with respect to the flange portion 1b as shown in FIGS. 4 and 5, and the cylindrical portion 1a is inclined with respect to the flange portion 1b as shown in FIG. Very few are vertical. As shown in FIGS. 9 and 10, when the cylindrical portion 1 a is inclined and heated by mounting it on the anode fitting 5, as shown in FIGS. Since the flange portion 1b is inclined with respect to the lower surface of the anode fitting 5, it is not uniformly pressed over the entire circumference, and a large variation occurs in the height of the anode fitting 5 after joining.

In the case where the cylindrical portion 1a is perpendicular to the flange portion 1b as shown in FIG. 6, since deformation occurs due to thermal expansion when heated as described above, uniform pressurization over the entire circumference is also required. Anode fitting 5 after joining
There is a considerable amount of variation in height.

FIG. 3 is a partially enlarged sectional view showing the shape of the stainless steel cap of the third invention. As described above, in the stainless steel cap 1 of the third invention, the radius of curvature of the bent portion 1c that transitions from the cylindrical portion 1a to the flange portion 1b is set to 0.4.
0 to 0.60R. Since the radius of curvature of the bent portion of the conventional stainless steel cap is about 0.15 to 0.25R, the radius of curvature of the bent portion 1c in the third invention is considerably larger than that of the related art. Furthermore, the stainless steel cap 1 of the third invention has a shape in which the cylindrical portion 1a is curved inward, unlike the conventional one.

FIG. 7 shows a state in which the stainless steel cap 1 of the third invention having such a shape is mounted on the anode fitting 5 and set on the jig 7. When the temperature is increased, as shown in FIG. 8, the curvature of the cylindrical portion 1a is almost eliminated, and almost no deformation is observed in the flange portion 1b, and a state substantially parallel to the lower surface of the anode fitting 5 is obtained.

It is not clear why such a state is obtained when the temperature is raised, but the curvature of the cylindrical portion 1a and the bending portion 1c
It is considered that the large radius of curvature alleviates distortion due to thermal expansion at the time of temperature rise and suppresses deformation of the flange portion 1b. Then, by performing the pressing in the ideal state as described above, the anode fitting 5 is uniformly pressed, as compared with the case where a conventional shape as shown in FIGS. 4 to 6 is used. In addition, it is possible to reduce variations in the height of the entire circumference of the anode fitting 5 after bonding.

In the first to third inventions, the thickness of the stainless steel cap is 0.10 to 0.2.
It is preferably 0 mm. If the sheet thickness is less than 0.10 mm, it is difficult to impart a predetermined shape to the material by press molding, while if the sheet thickness exceeds 0.20 mm, the material cost increases.

The first to third inventions can be arbitrarily combined. For example, the fourth invention is a combination of all of the first to third inventions. That is, a fourth invention is a stainless steel cap for thermocompression bonding having a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and the material has a thermal expansion coefficient of 15%.
× 10 ^-6 / ° C or less, micro Vickers hardness (MHv)
Is 150 or less, the radius of curvature of the bent portion that transitions from the cylindrical portion to the flange portion is 0.40 to 0.60R, and the cylindrical portion is curved inward.

As described above, by combining the first to third inventions, a higher effect can be obtained as compared with the case where each of them is implemented alone. INDUSTRIAL APPLICABILITY The stainless steel cap of the present invention can be suitably used for joining an insulating ring and an anode metal in the production of a large-sized sodium-sulfur battery having an inner diameter of a cylindrical portion of 70 mm or more.

[0033]

EXAMPLES Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

(Example 1) SUS304 (austenite), SUS430 having different coefficients of thermal expansion
(Ferrite) and Kovar (Fe-Ni-Co alloy) as materials, and a stainless steel cap prototype (No. 1 to No. 1)
3) was produced. The dimensions of these prototypes were 8 mm in height, the inner diameter of the cylindrical portion was 85 mm, the inner diameter of the flange portion was 72 mm, and the thickness of each material was 0.15 mm.

As shown in FIG. 12, the insulating ring 3 is placed on the flange 5 b of the anode fitting 5, and the stainless steel cap 1 of the prototype is attached to the lower part of the anode fitting 5.
It was set on a jig 7 and heated. In this state, after examining the degree of deformation of the stainless steel cap 1 due to thermal expansion, pressure is applied from above the insulating ring 3 to perform thermocompression bonding. The difference between the maximum value and the minimum value (hereinafter referred to as “C parallelism”) was determined. The height of the anode fitting 5 was measured using a laser measuring device. Table 1 shows the results of this example.

[0036]

[Table 1]

As shown in Table 1, when a material having a smaller thermal expansion coefficient was used, the deformation due to heating before pressurization was smaller, and the C parallelism of the anode fitting after bonding was also smaller.

Example 2 Prototypes of stainless steel caps (Nos. 4 to 13) were manufactured using ten kinds of stainless steel materials having different micro Vickers hardnesses. The dimensions of these prototypes are 8 mm in height, 85 mm in the inner diameter of the cylinder, and 72 mm in the inner diameter of the flange.
The thickness of each material was 0.15 mm.

Using these prototypes, hot-press bonding between the insulating ring and the anode fitting was performed in the same manner as in Example 1, and the C parallelism of the joined anode fitting was determined. FIG.
As in No. 6, beam welding was performed between the anode fitting 5 and the anode container 9 of each joined body obtained by hot-pressure joining, and the possibility of the welding was examined. The micro Vickers hardness is J
IS Z-2244 / JIS B7734 (Load: 300
The value measured according to gr) was used. Table 2 shows the results of this example.

[0040]

[Table 2]

As shown in Table 2, the C parallelism of the anode metal tends to increase as the micro-Vickers hardness of the material increases, and the C-parallelism of the material exceeds 150 with the micro-Vickers hardness of the material. In 9 to 13, the C parallelism is 0.5
mm, welding became impossible.

(Example 3) Prototypes (Nos. 14 to 16) of a conventional stainless steel cap 1 as shown in FIGS.
(FIG. 4), No. Nos. 17 to 19 (FIG. 5); 20-22
(FIG. 6)) and a prototype of stainless steel cap 1 according to the third invention having a shape as shown in FIG.
5) and 3 each.

The dimensions of these prototypes are 8
mm, the inner diameter in the vicinity of the bent portion of the cylindrical portion is 85 mm, the inner diameter of the flange portion is 72 mm, and the materials are all 0.15 mm in thickness, the coefficient of thermal expansion is 17 × 10 ⁻⁶ / ° C., and the micro Vickers hardness is MHv138. Was used. The radius of curvature of the bent portion that transitions from the cylindrical portion to the flange portion is the same as that of the prototype No. 0.15R for 14-16, prototype N
o. For Nos. 17-19, 0.21R, prototype no. 2
0.19R for 0 to 22; 23-2
5 was 0.48R.

Using these prototypes, hot-press bonding between the insulating ring and the anode fitting was performed in the same manner as in Example 1, and the C parallelism of the joined anode fitting was determined. FIG.
As in No. 6, beam welding was performed between the anode fitting 5 and the anode container 9 of each joined body obtained by hot-pressure joining, and the possibility of the welding was examined. Table 3 shows the results of this example.

[0045]

[Table 3]

As shown in Table 3, N having a conventional shape
o. When the thermo-compression bonding is performed at 14 to 22, all of them are C
The parallelism exceeded 0.5 mm, making welding impossible. On the other hand, No. 3 having the shape according to the third invention. 23-2
When the heat-pressure joining was performed in No. 5, the C parallelism was 0.2 mm or less, and welding was successfully performed.

(Embodiment 4) A prototype (N) of a stainless steel cap 1 according to the third invention having a shape as shown in FIG.
o. 26 to 28) and three prototypes (Nos. 29 to 31) of the conventional stainless steel cap 1 as shown in FIG. The dimensions of these prototypes are 8 mm in height, 85 mm in inner diameter near the bent part of the cylindrical part, and 72 mm in inner diameter of the flange part.
All have a thickness of 0.15 mm and a coefficient of thermal expansion of 17 × 10 ^-6 /
° C and a micro Vickers hardness MHv135. Further, the radius of curvature of the bent portion transitioning from the cylindrical portion to the flange portion is No. For Nos. 26 to 28, 0.47R, prototype No. For 29 to 31, it was 0.25R.

As shown in FIG. 11, an arbitrary one of these prototypes is radially cut with a cutter having a blade thickness of 1.50 mm to form a slit 21, and an interval S 1 on the outer peripheral side of the slit 21 is formed. The interval S2 on the inner peripheral side was measured using a microscope. Also, using these prototypes,
In the same manner as in Example 1, hot-press bonding between the insulating ring and the anode was performed, and the C parallelism of the joined anode was determined. Table 4 shows the results of this example.

[0049]

[Table 4]

From the results shown in Table 4, it is found that the shape No. 3 according to the third aspect of the present invention has no. When the heat and pressure bonding is performed at Nos. 26 to 28, the conventional shape No. It can be seen that the C parallelism of the anode fitting after the bonding is smaller than that in the case where the heat and pressure bonding is performed at 29 to 31.

In addition, No. In Nos. 29 to 31, the interval on the outer peripheral side of the slit is larger than the blade thickness of the cutter used for forming the slit, and the interval on the inner peripheral side of the slit is smaller than the blade thickness of the cutter. It is considered that compressive stress was generated near the outer peripheral portion and tensile stress was generated near the inner peripheral portion.

On the other hand, No. In Nos. 26 to 28, since both the gap on the outer circumference side and the gap on the inner circumference side of the slit are larger than the blade thickness of the cutter, the residual stress of the stainless steel cap before the slit formation is near the outer circumference and the inner circumference. It is considered that compressive stress was generated in both cases. Further, as a difference between the two, the difference between the slit interval on the outer peripheral side and the slit interval on the inner peripheral side is the same as in the case of No. 2. Nos. 26 to 28 are No.
It is considerably smaller than 29-31.

From these facts, the shape of the stainless steel cap relates to the distribution and magnitude of the residual stress, and the distribution and magnitude of the residual stress depend on the state of pressurization (uniformity of pressurization, etc.) in thermo-compression bonding. ) Is thought to have some effect, but it has not been clarified how it specifically affects it.

[0054]

As described above, if the insulating ring and the anode fitting are hot-pressed and joined using the stainless steel cap for hot-press joining of the present invention, the height of the anode fitting after the joining is reduced over the entire circumference. Variation can be reduced. For this reason, the joined body of the insulating ring and the anode fitting that has been hot-pressed using the stainless steel cap of the present invention has a diameter of 70 mm.
Even for a large-sized sodium-sulfur battery of mm or more, it can be welded to the anode container without causing poor welding.

[Brief description of the drawings]

FIG. 1 shows a micro-Vickers hardness according to the second invention of 1
FIG. 4 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in a thermocompression bonding using a stainless steel cap made of a material of 50 or less.

FIG. 2 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in a conventional hot-press bonding using a stainless steel cap made of a material having a micro Vickers hardness exceeding 150.

FIG. 3 is a partially enlarged sectional view showing a shape of a stainless steel cap according to a third invention.

FIG. 4 is a partially enlarged sectional view showing a shape of a conventional stainless steel cap.

FIG. 5 is a partially enlarged sectional view showing the shape of a conventional stainless steel cap.

FIG. 6 is a partially enlarged sectional view showing the shape of a conventional stainless steel cap.

FIG. 7 is a partially enlarged cross-sectional view showing a state where components are set before heating in hot-pressure joining using a stainless steel cap according to a third invention.

FIG. 8 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in the thermocompression bonding using the stainless steel cap according to the third invention.

FIG. 9 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in hot-pressure bonding using a stainless steel cap having a conventional shape.

FIG. 10 is a partially enlarged cross-sectional view showing a state before pressurization heated to a predetermined temperature in a thermocompression bonding using a stainless steel cap having a conventional shape.

FIG. 11 is a partially enlarged plan view showing a state in which a slit is formed in a prototype of a stainless steel cap in Example 4.

FIG. 12 is a partially enlarged cross-sectional view showing a method of hot-press bonding between an insulating ring and an anode fitting using a stainless steel cap.

FIG. 13 is a partially enlarged cross-sectional view showing a state where an anode fitting after hot-press bonding has been extended by pressurization.

FIG. 14 is a partially enlarged cross-sectional view showing a state in which the stainless steel cap is deformed by heating performed before pressurization of the thermocompression bonding.

FIG. 15 is a sectional view of a stainless steel cap.

FIG. 16 is a partially enlarged cross-sectional view showing joining of the anode fitting and the anode container by welding.

FIG. 17 is a sectional view showing the overall structure of a sodium-sulfur battery.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stainless steel cap, 3 ... Insulation ring, 5 ... Anode fitting, 7 ... Jig, 9 ... Anode container, 11 ... Solid electrolyte tube, 1
3 ... Cathode fitting, 15 ... Cathode cover, 17 ... Anode side terminal, 19
... cathode terminal, 21 ... slit.

Claims (4)

(57) [Claims] When the flange portion of an anode fitting having a cylindrical portion and a flange portion provided at a lower end of the cylindrical portion is heat-pressure bonded to an insulating ring, the anode fitting is attached to a lower portion of the anode fitting. A stainless steel cap for hot-pressure joining to be used, which has a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and has a thermal expansion coefficient of 15 × 10 ^A stainless steel cap for thermocompression bonding, wherein the temperature is not higher than ^-6 / ° C. 2. The method according to claim 1, wherein when the flange of the anode fitting having the cylindrical portion and the flange provided at the lower end of the cylindrical portion is joined to the insulating ring by heat and pressure, the anode fitting is attached to a lower portion of the anode fitting. A stainless steel cap for hot-pressure joining to be used, which has a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and has a micro Vickers hardness (MH) of the material.
v) is 150 or less, a stainless steel cap for hot-press bonding. 3. When the flange portion of an anode fitting having a cylindrical portion and a flange portion provided at the lower end of the cylindrical portion is hot-press bonded to an insulating ring, the anode fitting is attached to a lower portion of the anode fitting. A stainless steel cap for hot-pressure bonding to be used, wherein the stainless steel cap for hot-pressure bonding has a cylindrical portion and a flange portion protruding inward from a lower end of the cylindrical portion, and is bent from the cylindrical portion to the flange portion. A stainless steel cap for hot-pressure joining, wherein the radius of curvature of the portion is 0.40 to 0.60R and the cylindrical portion is curved inward. 4. When the flange portion of an anode fitting having a cylindrical portion and a flange portion provided at a lower end of the cylindrical portion is hot-press bonded to an insulating ring, the anode fitting is attached to a lower portion of the anode fitting. A stainless steel cap for hot-pressure joining to be used, which has a cylindrical portion and a flange portion projecting inward from a lower end of the cylindrical portion, and has a thermal expansion coefficient of 15 × 10 ⁻⁶ / ° C. or less, the micro Vickers hardness (MHv) is 150 or less, the radius of curvature of the bent portion transitioning from the cylindrical portion to the flange portion is 0.40 to 0.60 R, and the cylindrical portion is A stainless steel cap for thermocompression bonding characterized by being curved in the direction.