JP3015929B2 - Sodium-sulfur battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a junction between an insulating ring of a sodium-sulfur battery, an anode vessel flange and a cathode vessel flange, that is, a high-temperature joint structure, and more particularly to a method of improving residual stress at a joint interface. The present invention relates to a sodium-sulfur battery having a structure suitable for improving strength reliability.

[0002]

2. Description of the Related Art The structure of a conventional sodium-sulfur battery is as follows.
For example, Japanese Patent Application Laid-Open Nos.
It is disclosed in 138473. In this structure, α-alumina is used as an insulating ring, and the insulating ring and the steel cathode and anode container flanges are joined by an intermediate member made of aluminum by heat and pressure. At that time, the surface roughness of the α-alumina forming the insulating ring is defined, or a chromium diffusion layer is provided on the SUS304 container flange, and an aluminum coating layer is vacuum-deposited and then bonded by hot-pressing. α-
Some measures have been taken to improve the bonding strength between alumina (alumina) and the cathode and anode container flanges.

[0003] As a method for improving the strength reliability,
A method for improving the strength of the bonding interface itself and a method for improving the strength by reducing the residual stress at the bonding interface can be considered. Conventionally, a device for improving the strength of the bonding interface itself has been devised as described above, but no consideration has been given to the improvement of the strength from the viewpoint of reducing the residual stress.

Another conventional technique is disclosed in Japanese Patent Application Laid-Open No. 61-1 / 1986.
And the sodium-sulfur battery described in JP-A-61877, JP-A-62-49866 and JP-A-61-66868. In order to prevent lateral displacement and eccentricity during thermal pressure contact between the insulating ring and the cathode container flange, and to improve airtightness, a metal ring is provided on an outer surface of a joint portion between the cathode container flange and the insulating ring. As described above, the inside of the metal ring is filled with an aluminum layer from the viewpoint of preventing lateral displacement and eccentricity and further improving airtightness.

[0005]

In the heat-pressure joining of an α-alumina insulating ring and a steel container flange, since the linear expansion coefficients of the two are greatly different from each other, a large tensile force is applied during cooling after the high-temperature joining, that is, during the cooling process. Residual stress may occur. Therefore, the conventional joint structure has a problem in that the strength reliability of the joint is low. Since the aluminum layer is also filled between the metal ring and the insulating ring from the viewpoint of improving airtightness and the like, the joining structure in which the metal ring is disposed also solves the problem of large tensile residual stress generated during the temperature drop process. Could not cope.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an insulating ring, a cathode vessel flange, and an anode vessel from the viewpoint that reducing residual stress in tension or changing to residual stress in compression is effective for improving strength reliability. An object of the present invention is to provide a sodium-sulfur battery capable of improving the reliability of bonding strength with a flange.

[0007]

In order to achieve the object of the present onset that to achieve the above purpose
Ming, the presence of sulfur present sodium inside to outside
Na and thorium conductive solid electrolyte tube, an insulating ring which is bonded to the upper outer side of the solid electrolyte tube, the insulating ring
The cathode volume in the vertical plane and the anode vessel flange and the cathode container flanges joined respectively, and the anode container flange
To the free end of at least one of the
And a cylindrical body provided substantially concentrically.
The cylindrical body disposed outside the edge ring includes the insulating phosphor.
A sodium-sulfur battery is disposed at an interval between the battery and an outer peripheral surface of the battery.

[0008]

[0009]

[0010] In this case, the before and Symbol insulating ring flange can be assumed to be bonded through an intermediate material made of aluminum. This intermediate material is cylindrical
Positioning the body end within the thickness of the cylinder
Thus, the joint compressive stress can be reliably improved. Ma
In addition, the positioning projection that the inner end of the intermediate material contacts
Forming on the cylindrical part makes positioning easy.
This is preferred.

[0011] The cylindrical member and the flange are made of aluminum , so that the intermediate member is made of aluminum.
Can be omitted, which results in only one interface at high temperature.
Thus, the joint compressive stress is further improved.

[0012]

[0013]

[0014] The insulating ring is notched face portion a part of said cylindrical body, the cylindrical body cylindrical outer surface and the insulating ring outer surface is disposed so as to be substantially flush to the cutout portion And according to the basic design dimensions
You do not need to change the law from the previous one.

Further, the cylindrical body is integrally formed with the flange.
It may be one that is joined together with separate things
No. In particular, the cylindrical body has a higher linear expansion coefficient than the flange.
It is preferably formed of a material having a high threshold. This
If so, the joining residual stress can be further improved. In addition, the cylindrical body
By forming a lit, the entire joint with the insulating ring
There is uneven tensile residual stress over the circumference
However, the dispersion is absorbed for each part and
Can improve power. Also, the cylinder is thicker than the flange
The formation improves joint residual stress even more.
It is preferable because it is possible.

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

Further, preferred to form a groove on a surface opposite to the insulating ring a coupling portion between the circular cylinder and the flange
New According to this, the thickness of the flange is reduced by the groove.
Therefore, the residual compressive stress caused by the cylinder is more greatly affected.
Can be made. Alternatively, the flange is a cylindrical body
To be tapered in cross section so that the connection side of
Thereby, a similar effect can be obtained.

[0023]

[0024]

According to the above-mentioned solution, the present invention has the following functions.
The object of the invention can be solved. That is, a cylindrical body
Attempts to shrink in the direction of the center of the cylinder during the cooling process after thermal welding.
I do. At that time, the fixed end of the cylindrical body is restrained
However, the free end contracts in the direction of the center of the cylinder. The contraction force is
The junction between the insulating ring and the container flange, that is, high temperature
Acts on the end of the joint interface and acts on the same area that has been considered a problem.
In this case, the tensile residual stress is reduced or the compressive residual stress is reduced, and the strength reliability of the joint interface is improved .
If the cylinder is placed outside the insulating ring,
Space between the cylindrical body and the outer peripheral surface of the insulating ring.
The free end of the cylinder is oriented in the direction of the center of the cylinder.
It does not prevent shrinkage.

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

FIG. 1 shows an embodiment of a sodium-sulfur battery according to the present invention. On the upper part of the solid electrolyte tube 5 made of sodium conductive β-alumina, an insulating ring 1 made of α-alumina, whose coefficient of linear expansion is not so different from that of the solid electrolyte tube 5, is joined by glass soldering. A steel cathode vessel flange 4 and an anode vessel flange 2b are joined to this insulating ring 1 at a high temperature by a high pressure through an intermediate ring material 3 made of aluminum. In this embodiment, a compressive residual stress generating means 12 is provided at an end of the anode flange 2b near the insulating ring 1. The compressive residual stress generating means 12 has a function of reducing the tensile residual stress or improving the compressive residual stress in the process of cooling to the room temperature or the process of cooling from the time of the high temperature bonding. The compressive residual stress generating means 12 of this embodiment is formed of a cylindrical body formed integrally with the anode vessel flange 2b. A structure in which sodium 7 is sealed inside the solid electrolyte tube 5 and sulfur 6 impregnated in a mold is filled between the solid electrolyte tube 5 and the anode tube 11 to charge and discharge via the cathode terminal 9 and the anode terminal. It is. In FIG. 1, reference numeral 8 denotes a safety container.

On the basis of FIG.
The principle 2 will be described. The cylindrical body 12, which is the compressive residual stress generating means of the present invention, has
Linear expansion coefficient of the small α- alumina (7.6 × 10 ~ ⁶ /
C) and a steel (approximately 15
The × difference in該線expansion coefficient between the container flange 2b of 10 ~ ⁶ / ℃) (twice), the cylindrical body 12 is deformed mode in diameter decreases. At this time, the base portion on the proximal end side of the cylindrical body 12 is in a restrained state by being connected to another member, while the free end of the cylindrical body 12 is not restrained. as a result,
The free end of the cylindrical body 12 contracts and deforms so as to rotate around the base end side, and this deformation causes a heat contraction moment M to act on the root of the cylindrical body 1 to crush the portion of the intermediate ring member 3. That is, a bending stress is generated in the container flange 2b at the base of the cylindrical body 1 by the heat shrinkage moment M.
By utilizing the bending stress, the residual stress σ ₁ at the end of the interface A is reduced to a small tensile residual stress, or the residual stress σ ₁ is changed to a compressive residual stress.

The design criteria of the cylindrical body 12 as the compressive residual stress generating means will be described with reference to FIG. It is desirable that the length h of the cylinder 12 be equal to or greater than the value determined by the following equation (1).

[0041]

(Equation 1)

Here, β is a parameter of the cylindrical body 12, and is expressed by the following equation (2). ν is the Poisson's ratio of the material of the cylinder 12, R is the radius of the cylinder, and t is the thickness of the cylinder.

[0043]

(Equation 2)

FIG. 4 shows the behavior of the residual stress (maximum principal stress σ ₁ ) at the inner end at the joint interface A between the anode vessel flange 2b, which is a high-temperature joint, and the aluminum intermediate ring member 3.
This is obtained by elasto-plastic analysis using the finite element method. The residual stress sigma ₁ in the conventional cylindrical body 12 is not structured in a cooling process to room temperature than at a high temperature bonding at 600 ° C., 25
The tensile stress is 0 to 300 MPa, which is an unfavorable stress state from the viewpoint of strength reliability. On the other hand, in the structure provided with the cylindrical body 12 of the present invention, both the long and short cylindrical bodies have a large tensile force at the inner end of the interface A due to the heat shrinkage moment M of the cylindrical body 12 during the temperature decreasing process. Is made small or the compressive residual stress is reduced. That is, by installing the cylindrical body 12, a heat shrinkage moment M as shown in FIG. 2 acts in the cooling process at the time of high-temperature joining, and a compressive residual stress is applied to the inner end of the interface A. By utilizing the residual stress of the compression, the large tensile residual stress σ ₁ generated without the cylindrical body 12 can be reduced or reduced to the residual stress of the compression, and the strength reliability of the interface A can be improved. . When the cylindrical body 12 of the present invention is installed, by the action of the heat shrinkage moment M, a long cylinder is improved to a compressive residual stress of about −15 MPa, and a short cylinder is reduced to a residual tensile stress of about 20 MPa to about 20 MPa. You can see that.

Next, FIG. 5 shows another embodiment of the present invention. In the embodiment shown in FIG. 1 or FIG. 3, the plate thickness of the cylindrical body 12 is substantially the same as that of the container flange 2b, but as shown in FIG. Is formed. Since the thicker cylindrical body 12 provides a larger heat shrinkage moment M, the effect of improving the residual stress at the end of the bonding interface to a larger compressive residual stress can be obtained.

FIGS. 7 and 8 show another embodiment of the present invention. As shown in FIG. 7, the end portion 10 of the intermediate ring member 3 is located before or outside the range of the thickness of the cylindrical body 12, as shown in FIG. The position of the end portion 10 of the ring member 3 is matched, or the cylindrical member 12 is installed so that the end portion 10 of the intermediate ring member 3 is located between the plate thicknesses of the cylindrical member 12 as shown in FIG. Thus, the residual stress at the end of the bonding interface can be more reliably improved.

FIG. 9 shows another embodiment of the present invention. A positioning projection 17 for positioning the end portion 10 of the intermediate ring member 3 in contact therewith is provided at the base end of the cylindrical body 12. The protrusion 17 is provided between the anode container flange 2b and the cylindrical body 1.
2 and is formed by integral molding. Since the projection 17 is in contact with the end 10 of the intermediate ring member 3, an effect of more reliably improving the residual stress at the end of the joint interface to the compressive residual stress can be obtained.

FIG. 10 shows another embodiment of the present invention. The projection 17 is provided at a position where the end portion 10 of the intermediate ring member 3 is positioned so as to coincide with the center of the thickness of the cylindrical body 12. According to this embodiment, the effect of improving the residual stress at the end of the joint interface to a larger compressive residual stress can be obtained.

FIG. 11 shows another embodiment of the present invention. In this embodiment, slits 13 are provided at substantially regular intervals in a cylindrical body 12 integrally formed with the anode container flange 2a. Therefore, since the heat shrinkage moment M is generated individually for each unit piece 12a divided by each slit 13 of the cylindrical body 12, the residual stress at the joining interface end is individually improved for each unit piece 12a without variation. The effect is obtained.

FIG. 12 shows another embodiment of the present invention. This embodiment shows only the cylinder 12. With the flat plate 14 as a unit, a plurality of the flat plates 14 are attached to the anode container flange 2b so as to be adjacent to each other and form the cylindrical body 12. Therefore, in the state of being attached to the anode container flange 2b, the cylindrical body 12 has a slit similarly to the embodiment of FIG. As in the embodiment of FIG. 11, the effect of individually improving the residual stress at the joint interface end can be obtained.

FIG. 13 shows another embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 1 in that a groove 15 is formed on the surface of the connecting portion between the cylindrical body 12 and the container flange 2b opposite to the insulating ring 1. This groove 15
Are formed over the entire circumference. With this groove 15,
The effect of improving the residual stress at the end of the joint interface to a larger compressive residual stress is obtained.

FIG. 14 shows another embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 1 in that the container flange 2b is formed in a tapered cross-section so that the connection side with the cylindrical body 12 becomes thinner. This tapered cross section is formed over the entire circumference. The tapered cross section of the container flange 2b has the effect of improving the residual stress at the end of the joint interface to a larger compressive residual stress.

FIG. 15 shows another embodiment of the present invention. The cylindrical body 12 is formed by integrally joining the container flange 2b and a separate body. Reference numeral 18 denotes a weld. In this embodiment, the material of the cylindrical body 12 is formed of stainless steel or aluminum having a larger linear expansion coefficient than conventional mild steel. As a result, there is an effect that the residual stress can be further improved, and a required design change can be widely supported.

FIG. 16 shows another embodiment of the present invention. In this embodiment, the cylindrical body 12, the anode vessel flange 2b and the intermediate ring member 3 shown in FIG. 1 or 3 are all integrally formed of aluminum. This integral molding structure can further improve the residual stress. Further, in this embodiment, the interface between the anode container flange 2b and the intermediate ring material 3 as shown in FIG. 1 or FIG. 3 is eliminated, and the joining surface is formed between the insulating ring (α-alumina) 1 and the anode container flange 2b (aluminum). Since only one of the interfaces 16 can be used, the quality can be stabilized without being affected by the variation in the joining between the anode container flange 2b and the intermediate ring member 3.

FIG. 17 shows an embodiment in which the portion corresponding to the intermediate ring member is omitted from the embodiment of FIG. FIG.
Almost the same effects as those of the embodiment can be obtained.

FIG. 18 shows an embodiment of another invention different from the above-mentioned inventions. The cylindrical body 12 as a compressive residual stress generating means is provided not on the anode container flange 2b but on the cathode container flange 4. Based on FIG. 19, the compressive residual stress generating means 1 provided on the cathode vessel flange 4
The principle 2 will be described. This is basically the same as the case provided on the anode container flange 2b. In the cooling process after the high-temperature joining, the cylindrical body 12 which is the compressive residual stress generating means of the present invention has an α-alumina insulating ring 1 having a small linear expansion coefficient and a steel cathode vessel flange 4 having a large linear expansion coefficient. Due to the difference in the coefficient of linear expansion, the cylindrical body 12 enters a deformation mode in which the diameter becomes smaller. At that time, the cylindrical body 12
The base portion on the base end side of the cylindrical body 12 is in a constrained state by being connected to another member, while the free end of the cylindrical body 12 is not constrained.
As a result, the free end of the cylindrical body 12 contracts and deforms so as to rotate about the base end side, and the heat contraction moment M acts on the base of the cylindrical body 12 due to this deformation. That is, a bending stress is generated in the container flange 4 at the root of the cylindrical body 1 by the heat shrinkage moment M. By using the bending stress, the residual stress σ ₁ at the end of the interface A ′ is reduced to a small tensile residual stress, or the residual stress σ ₁ is changed to a compressive residual stress.

When the cylindrical body 12 is provided on the cathode container flange 4, the cylindrical body 12 and the outer surface of the insulating ring 1 are structured to face each other. If the cylindrical body 12 and the outer surface of the insulating ring 1 are in close contact with each other, the free end of the cylindrical body 12 cannot be contracted and deformed as described with reference to FIG. Are formed at intervals. The size of the interval is set such that the free end of the cylindrical body 12 does not contact the insulating ring 1 when the cylindrical body 12 is thermally contracted. By providing such an interval, the residual stress can be surely improved.

Next, it goes without saying that the structure shown in FIGS. 5 to 17 can also be applied to the cylindrical body 12 provided on the cathode container flange 4. One example is shown in FIG. A projection 17 for positioning with respect to the intermediate ring member 3 is provided. The function and effect are the same as those of the projection of the above embodiment.

FIG. 21 shows another embodiment of the present invention. In this embodiment, a part of the insulating ring 1 facing the cylindrical body 12 is partially cut out, and the cylindrical body 12 is formed so that the outer surface 20 of the cylindrical body 12 and the outer surface 21 of the insulating ring 1 are substantially flush with the cutout portion 19. It is arranged to become. With this notch structure, the distance between the outer surface of the insulating ring 1 and the rising portion of the anode container flange 2b in FIG. 18 can be set in the same manner as when the cylindrical body 12 is not provided, and thus the basic design dimensions Without changing the previous one.

FIG. 22 shows another embodiment of the present invention. In this embodiment, a cylindrical body 12 as a compressive residual stress generating means is provided on both the anode container flange 2b and the cathode container flange 4. That is, this is a state in which the embodiments of FIGS. 1 and 18 are combined. Alternatively, each of the embodiments shown in FIGS. 1 and 18 to which the structure shown in FIGS. 5 to 17 is applied may be appropriately combined. As a result, the residual stress can be reliably improved for both joints.

[0061]

According to the present invention, the large tensile residual stress generated at the interface end of the high-temperature joint between the insulating ring and the container flange can be reduced to a small tensile stress or a small compressive residual stress. This has the effect of improving strength reliability.

Further, according to the fifth aspect of the present invention, since the intermediate material is omitted, the high-temperature joint becomes only one interface, so that the joint residual stress is further improved. Since the stress generating means is a cylindrical body, the structure can be simplified and the above-mentioned joint residual stress can be improved. According to the seventh invention, since the interval between the cylindrical body provided on the cathode container flange side and the insulating ring is defined in consideration of the deformation due to thermal shrinkage of the cylindrical body, the joint residual stress can be reliably and stably reduced. Can be improved. According to the eighth invention, when providing the interval between the cylindrical body provided on the cathode container flange side and the insulating ring,
The insulating ring is partially cut out, and the cylindrical body is disposed in the cutout portion so that the outer surface of the cylindrical body and the outer surface of the insulating ring are substantially flush with each other. Do not change. According to the ninth aspect, since the cylindrical body is formed integrally with the flange, the manufacture is easy, and the generation of the compressive residual stress can be easily made uniform over the entire circumference.
According to the tenth aspect, since the cylindrical body is formed by integrating the flange and the separate body, it can widely cope with a required design change. According to the eleventh aspect, since the cylindrical body is formed of a material having a larger linear expansion coefficient than the flange, the joint residual stress can be further improved.

According to the twelfth aspect, since the cylindrical body is provided with the slit, even if a tensile residual stress having a variation occurs over the entire circumference of the joint with the insulating ring, the variation is absorbed by each portion. The joint residual stress can be improved. First
According to the third aspect, since the cylindrical body is formed to have a larger thickness than the flange, the joint residual stress can be further improved. According to the fourteenth aspect, since the end of the intermediate body is located within the thickness of the cylindrical body, the joining residual stress can be more reliably improved. According to the fifteenth aspect, since the positioning projection is provided on the cylindrical body portion, the positioning of the intermediate body can be easily performed. According to the sixteenth aspect, the groove reduces the thickness of the flange at that portion, so that the joint residual stress can be further improved. According to the seventeenth aspect, since the section thickness is reduced by forming the tapered section, the joint residual stress can be further improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view of a sodium-sulfur battery according to the present invention.

FIG. 2 is an explanatory diagram illustrating the operation of the cylindrical body of the present invention.

FIG. 3 is an enlarged sectional view of a high-temperature bonding portion on the anode container flange side in FIG. 1;

FIG. 4 is a diagram illustrating the effect of the present invention by taking the temperature on the horizontal axis and the residual stress on the vertical axis.

FIG. 5 is an enlarged sectional view of a main part of another embodiment of the present invention in which a thick cylinder is used as a cylindrical body.

FIG. 6 is an enlarged sectional view showing a position where a cylindrical body is installed according to another invention of the present application.

FIG. 7 is an enlarged sectional view showing a position where a cylindrical body is installed according to another invention of the present application.

FIG. 8 is an enlarged sectional view showing a position where a cylindrical body is installed according to another invention of the present application.

FIG. 9 is an enlarged sectional view of another invention of the present application, in which a positioning projection of an intermediate ring member is provided.

FIG. 10 is an enlarged sectional view of another invention of the present application, in which a positioning projection of an intermediate ring member is provided.

FIG. 11 is an enlarged sectional view of another embodiment of the present invention in which a slit is provided in a cylindrical body.

FIG. 12 is an enlarged sectional view of another embodiment of the present invention, in which a cylindrical body is formed in units of a flat plate.

FIG. 13 is an enlarged sectional view of another embodiment of the present invention, in which a groove is provided in the anode container flange.

FIG. 14 is an enlarged sectional view of another embodiment of the present invention, in which an anode container flange is formed in a tapered sectional shape.

FIG. 15 is an enlarged cross-sectional view of another embodiment of the present invention in which the material of the cylindrical body is changed.

FIG. 16 is an enlarged cross-sectional view of an embodiment in which a cylindrical body, an anode container flange, and an intermediate material are integrally formed of an aluminum material according to another invention of the present application.

FIG. 17 is an enlarged sectional view of another embodiment of the present invention in which the intermediate member is omitted and the cylindrical body and the anode container flange are integrally formed of an aluminum material.

FIG. 18 is a partially cutaway sectional view of a sodium-sulfur battery according to another invention of the present application.

FIG. 19 is an explanatory diagram illustrating the operation of the cylindrical body of FIG. 18;

20 is an enlarged cross-sectional view of a high-temperature bonding portion on the cathode container flange side in FIG.

FIG. 21 is an enlarged sectional view of another embodiment of the present invention in which an insulating ring is partially cut away.

FIG. 22 is a partially cutaway sectional view of a sodium-sulfur battery according to another invention of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating ring 2 Anode container 2b Anode container flange 3 Intermediate ring material 4 Cathode container flange 5 Solid electrolyte tube 6 Sulfur 7 Sodium 10 End of intermediate ring material 12 Circular tube 13 Slit 14 Flat plate 15 Groove 16 Joining interface 17 Positioning protrusion

Continuing from the front page (72) Inventor Yasuo Tachi 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Stock Company Hitachi, Ltd. Hitachi Plant (72) Inventor Tadahiko Miyoshi 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Stock Hitachi, Ltd., Hitachi Plant (72) Inventor Sadao Mizuno 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Stock Company Hitachi, Ltd. Hitachi Plant (72) Inventor Hisamitsu Hatoh 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (72) Inventor Yoichi Shimizu 3-1-1 Kochicho, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd. Hitachi Plant (72) Inventor Takashi Machida 502, Kandachicho, Tsuchiura City, Ibaraki Prefecture Hitachi, Ltd.Mechanical Research Laboratory Co., Ltd. (72) Inventor Yutaka Horikawa 2-230 Kanda Jimbocho, Chiyoda-ku, Tokyo Tokyo Electric Power Company R & D Laboratories (72) Akiyasu Okuno 2-2-2 Kanda Jimbocho, Chiyoda-ku, Tokyo No. 30 Tokyo Electric Power Company Development Laboratory (5 6) References JP-A-5-54907 (JP, A) JP-A-59-49363 (JP, U) JP-A-61-114664 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H01M 10/39

Claims (13)

(57) [Claims] 1. A sodium-conducting solid electrolyte tube having sodium inside and sulfur outside, an insulating ring joined to the upper and outer sides of the solid electrolyte tube, and joined to upper and lower surfaces of the insulating ring, respectively. The anode container flange and the cathode container flange, and a cylindrical body fixed to the free end of at least one of the anode container flange and the cathode container flange and provided substantially concentrically, A sodium-sulfur battery in which the outer cylindrical body is spaced from the outer peripheral surface of the insulating ring. 2. The sodium-sulfur battery according to claim 1, wherein the insulating ring and the flange are joined via an intermediate material made of aluminum. 3. The sodium-sulfur battery according to claim 2, wherein the end of the intermediate member on the side of the cylindrical body is formed within the thickness of the cylindrical body. Sulfur battery. 4. The sodium-sulfur battery according to claim 2, wherein a positioning projection with which an inner end of the intermediate member abuts is formed on the cylindrical body. . 5. The sodium-sulfur battery according to claim 1, wherein said cylindrical body and said flange are made of aluminum. 6. The sodium-sulfur battery according to claim 1, wherein a portion of the insulating ring facing the cylindrical body is partially cut away, and the cylindrical body is formed at the cutout portion with the outer surface of the cylindrical body. A sodium-sulfur battery, wherein the battery is disposed so that an outer surface of the insulating ring is substantially flush with the outer surface. 7. The sodium-sulfur battery according to claim 1, wherein the cylindrical body is formed integrally with the flange. 8. The sodium-sulfur battery according to claim 1, wherein the cylindrical body is formed by integrally joining the flange and a separate body. . 9. The sodium-sulfur battery according to claim 1, wherein said cylindrical body is formed of a material having a larger linear expansion coefficient than said flange. 10. The sodium-sulfur battery according to claim 1, wherein the cylindrical body has a slit formed therein. 11. The sodium-sulfur battery according to claim 1, wherein the cylindrical body is formed thicker than the flange.
Sulfur battery. 12. The sodium-sulfur battery according to any one of claims 1 to 11 , wherein a groove is formed in a connecting portion between the cylindrical body and the flange and on a surface opposite to the insulating ring. A sodium-sulfur battery as a feature. 13. The sodium-sulfur battery according to claim 1, wherein the flange is formed to have a tapered cross section in which a connecting side to a cylindrical body is thin. battery.