JPH09270269A - Sodium sulfur battery module and battery system using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery system with high reliability by using a Cr- containing alloy as a material constituting a positive electrode container, and using a joint member of the Cr-containing alloy and Al or an Al alloy as an electrode terminal connecting to the positive container. SOLUTION: A bag pipe made of a lithium doped β-alumina sintered body is used as a solid electrolyte pipe 11. An α-alumina ring is used as an insulation member 17, and joined with the pipe 11, then the member 17, a negative electrode container 12, and a flange 16 are joined with an Al-Si-Mg base alloy foil. The negative electrode 12 is made of SUS 329J material, and filled with sodium 18 and SUS wick, then sealed. A positive container 14 is made of SUS 310S and the flange 16 is made of SUS 329J, and they are welded to unite them. An electrode terminals 4, 5 are made of the clad material of SUS 430 or SUS 304 and aluminum, SUS parts 41, 51 are welded to the containers 12, 14 respectively, aluminum parts 42, 52 and an aluminum bus bar 6 are spot- welded. A battery obtained is put in a heat insulating container to form a module.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sodium sulfur suitable for use in battery systems such as power storage devices, electric vehicles, emergency power supplies, uninterruptible power supplies, power system peak cut devices, frequency / voltage stabilizers, and the like. The present invention relates to a battery module and a battery system using the same.

[0002]

2. Description of the Related Art A sodium-sulfur battery using sodium for a negative electrode and sulfur for a positive electrode has been attracting attention because of its high efficiency and energy density, and is expected to be used for a power storage device, an electric vehicle and the like. However, when constructing a battery module in which a plurality of batteries are connected, there remains a reliability problem in connection between electrode terminals, connection between electrode terminals and busbars, and battery container material connected to electrode terminals. It had been. That is, as a method of connecting a plurality of batteries, as shown in Japanese Patent Application Laid-Open No. 4-284351, electrode terminals such as an Al alloy having a low electric resistance are screwed to an interconnector, or Japanese Patent Application Laid-Open No. 3-59961. Gazette and the same 5-114417
As disclosed in Japanese Unexamined Patent Publication No. 282556, an Al alloy or other electrode terminal is heat-pressed to a battery container made of an iron-based material through a brazing material.
An example in which electrode terminals made of an alloy are joined by spot welding has been proposed. However, the screwing method has a problem that Al or Al alloy plastically deforms at a temperature of about 350 ° C., which is a battery operating temperature, and the screwing portion is likely to loosen due to repeated temperature rising and falling. With the method of heat-pressure contact with the system electrode terminals, there is a risk that a large load will be applied to the joint when the battery vibrates due to an earthquake, etc., and the dissimilar material joint with Al or Al alloy, which easily forms brittle intermetallic compounds, will be damaged In the method of spot welding Al alloys with each other, if the material of the positive electrode container or the negative electrode container is other than the Al alloy, an intermetallic compound is easily formed at the joint between the electrode terminal and the positive electrode container or the negative electrode container. When dissimilar material joints occur, reliability is also impaired. When Al or Al alloy is used for the positive electrode container, the container is deformed by the stress from the positive electrode mold during temperature rising and falling. Since it reacts with sulfur to form an insulative sulfide, it is necessary to coat the inner surface of the positive electrode container with a corrosion-resistant layer containing Cr, Ti, C, etc. as the main component, which may easily cause peeling or defects of the coating. However, there is a problem in that Al and sulfur react with each other in the peeled portion or the defective portion of the corrosion resistant layer to impair the battery characteristics. As described above, the conventional sodium-sulfur battery module in which a plurality of batteries are connected has a problem in reliability. In addition,
Japanese Unexamined Patent Publication (Kokai) No. 3-127465 reports an example of using a clad material such as Al and Fe as a part of the positive electrode container or the negative electrode container, but does not consider the problem of connection between batteries.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide batteries for highly reliable power storage devices, electric vehicles, emergency power supplies, uninterruptible power supplies, power system peak cut devices, frequency / voltage stabilizers, and the like. To provide a system.

[0004]

In order to achieve the above object, the sodium-sulfur battery module of the present invention comprises a negative electrode container containing sodium, a positive electrode container containing a positive electrode mold made of sulfur or sodium polysulfide, and A sodium ion conductive solid electrolyte separated between the negative electrode and the positive electrode, and the negative electrode container connected to the solid electrolyte,
In a sodium-sulfur battery module in which a plurality of sodium-sulfur batteries consisting of an insulating member joined to a positive-electrode container, and connected via electrode terminals and housed in a heat-insulating container kept at high temperature, the positive-electrode container is configured. A Cr-containing alloy is used as a material, and a Cr-containing alloy and Al or an Al alloy is used as the electrode terminal connected to the positive electrode container, and the Cr-containing alloy portion of the electrode terminal is bonded to the positive electrode container. The Al or A of the electrode terminal
It is characterized in that a plurality of batteries are joined to each other through the l alloy part. Further, C is used as a material for the negative electrode container.
While using an r-containing alloy, a Cr-containing alloy and Al or an Al alloy is used as the electrode terminal to be joined to the negative electrode container, and the Cr-containing alloy portion of the electrode terminal is joined to the negative electrode container. Al of electrode terminal or Al
Joining a plurality of batteries via an alloy part, or joining both by using Al or an Al-containing alloy as a material forming the negative electrode container and a material forming the electrode terminal joined to the negative electrode container You can also do it.

Here, the Cr-containing alloy of the electrode terminal and A
It is desirable that the joint portion with 1 or Al alloy is provided in the low rigidity portion of the electrode terminal. Further, an aluminum film may be formed on the outer surface of the positive electrode container made of a Cr-containing alloy, the outer surface of the negative electrode container and / or the outer surface of the electrode terminal connected thereto by a method such as thermal spraying. Especially desirable.

Further, in the sodium-sulfur battery module of the present invention, the Al or Al alloy portions of the electrode terminals may be joined together via a bus bar made of Al or Al alloy.

Further, the Cr-containing alloy of the electrode terminal and the Al or Al alloy portion of the electrode terminal are joined by a mechanical method such as friction welding or rolling, and the Cr-containing alloy portion of the electrode terminal. And the positive electrode container or the negative electrode container, and the Al or Al alloy parts of the electrode terminal, or the Al or Al alloy part of the electrode terminal and the bus bar are joined by a welding method. Is desirable.

Further, the battery system of the present invention is a power storage device using the sodium-sulfur battery module of the present invention, an electric vehicle, an emergency power supply, an uninterruptible power supply, a power system peak cut device or a frequency / voltage stabilizing device. It is characterized by being.

The contents of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the sodium-sulfur battery module structure of the present invention. In the figure, reference numeral 1 is a heat insulating container, and a vacuum heat insulating container is usually used because of its excellent heat insulating performance. The inside of the heat insulating container is heated and kept warm by a heater (not shown). Reference numeral 2 denotes a lid of the heat insulating container, which may be provided on the upper portion of the heat insulating container. Reference numeral 3 denotes a plurality of sodium-sulfur batteries housed in a heat insulating container, which are separated by an insulating member 17 into a negative electrode container 31 and a positive electrode container 32. In this example, the negative electrode container is made of Al alloy and the positive electrode container is made of Cr-containing alloy. Also, 4 and 5 are electrode terminals joined to the sodium-sulfur battery 3,
Is an Al alloy, 5 is a Cr-containing alloy portion 51 and Al or A
It is composed of a joining member with the l alloy part 52, and the electrode terminal 4 has the negative electrode container 31 and the Cr-containing alloy part 5 of the electrode terminal 5.
1 is joined to the positive electrode container 32. Furthermore, 6 is Al
Alternatively, the bus bar is made of an Al alloy and is joined to the Al or Al alloy portion 52 of the electrode terminal 4 and the electrode terminal 5. Incidentally, 7 is a fixing plate for fixing the battery 3. FIG.
Shows a partial structure of another example of the sodium-sulfur battery module of the present invention, and those having the same numbers as in FIG. 1 have the same contents. In the figure, numeral 11 is an ion conductive solid electrolyte tube, which is normally made of β ″ alumina ceramics.
Reference numeral 12 is a negative electrode container that constitutes the negative electrode chamber 13 together with the solid electrolyte tube 11, and 14 is a positive electrode container, which constitutes the positive electrode chamber 15 together with the flange 16 and the solid electrolyte tube 11. In addition,
In this example, the negative electrode container 12, the positive electrode container 14, the flange 16
Both are made of a Cr-containing alloy. 17 is the negative electrode container 1
2 is an insulating member that insulates the positive electrode container 14 from each other and is joined to them, and the insulating member 17 and the opening of the solid electrolyte tube 11 are generally connected by glass solder or the like. 18 is sodium stored in the negative electrode chamber 13,
Reference numeral 19 is a positive electrode mold made of sulfur or sodium polysulfide, which is usually impregnated with carbon fiber or the like to form a positive electrode chamber 15
Is housed inside. The negative electrode container 12 and the sodium 18 are electrically connected by a metal plate (not shown). Further, 4 and 5 are electrode terminals made of a clad material obtained by rolling a Cr-containing alloy and an Al alloy, each of which is composed of a Cr-containing alloy portion 41, 51, Al or an Al alloy portion 42, 52, The Cr-containing alloy part 41 is joined to the negative electrode container 12, and 51 is joined to the positive electrode container 14. Further, 6 is a bus bar, which is made of Al or Al alloy parts 42, 5
It is joined to 2, and these are housed in a heat insulating container (not shown).

FIG. 3 shows a partial structure of another example of the sodium-sulfur battery module of the present invention, and the same reference numerals as those in FIGS. 1 and 2 show the same contents. In the figure, 20 is a sodium container installed in the negative electrode, and sodium 18 is supplied to the inner surface of the solid electrolyte tube 11 through a bottom hole 21 provided at the bottom of the sodium container, and the negative electrode container 12 and the sodium 18 are sodium. It is electrically connected by the container 20. Also in this example, both the negative electrode container 12 and the positive electrode container 14 are made of a Cr-containing alloy, and the electrode terminals 4, 5 made of a clad material of the Cr-containing alloys 41, 51 and Al or Al alloys 42, 52 are interposed. Al or Al
It is joined to the alloy bus bar 6, which is joined to an electrode terminal of an adjacent battery (not shown). Further, 60 is an aluminum layer formed on the outer surfaces of the negative electrode container 12, the positive electrode container 14, and the electrode terminals 4 and 5.

In these structures, the Cr of the electrode terminals is
The dissimilar material joint of the containing alloy and Al or Al alloy is provided inside the electrode terminal, and the rigidity of this portion is generally smaller than the rigidity of the joint with the battery container and the joint with the bus bar. Even if the battery vibrates under the influence of Al or Al
The stress applied to the joint between the compound and the dissimilar material is small, and the joint reliability can be kept high. Further, since a bulk material of a Cr-containing alloy is used as the positive electrode container, the alloy itself has excellent corrosion resistance, and there is no need to provide a corrosion-resistant coating layer inside, so there is no problem of peeling or defects of the corrosion-resistant coating layer, Because of the low electrical resistance of chromium sulfide generated by reaction with sulfur, there is no fear of deterioration of battery characteristics due to corrosion of the positive electrode container by sulfur or sodium polysulfide. As a result, a highly reliable sodium-sulfur battery module in which a plurality of batteries are connected is realized.

As a method of joining the Cr-containing alloy and Al or Al alloy for forming the electrode terminal, the friction welding method is used because of its high mass productivity and the difficulty of forming a brittle intermetallic compound layer. However, this method makes it possible to easily obtain a highly reliable joining member.
Alternatively, a clad material of Cr-containing alloy and Al or Al alloy may be formed by a rolling method and used as an electrode terminal. The use of the clad material has the advantage that the electric resistance of the electrode terminals can be reduced because the resistance of the Al portion is low. In this case, the Cr-containing alloy portion of the clad material is joined to the positive electrode container or the negative electrode container, and the Al or Al alloy portion of the clad material is joined to another battery or bus bar. In addition, Cr
It is desirable to use a welding method for joining the contained alloys and for joining Al or Al alloys from the viewpoint of productivity and reliability.

Further, as shown in FIG. 3, when an aluminum layer is provided on the outer surfaces of the positive electrode container, the negative electrode container and the electrode terminal made of a Cr-containing alloy, the electric resistance of the container and the electrode terminal is lowered, so that when energized. There is no fear of local resistance heating, and the reliability of the battery and battery module is further improved. As a method of forming this aluminum layer, a thermal spraying method of Al or an Al alloy, a dipping method in molten aluminum, etc. can be considered, but from the viewpoint of reliability, after joining the electrode terminals to the positive electrode container and the negative electrode container, The method of spraying Al or Al alloy from above is most preferable. According to this method, the aluminum layer can be formed by suppressing the temperature rise of the dissimilar material joint portion in the electrode terminal relatively small, and the reliability of the dissimilar material joint portion can be kept high. The purpose of the aluminum layer formed on the positive electrode container, the negative electrode container, and the electrode terminals is to reduce the electrical resistance, and peeling of the aluminum layer is unlikely to be a problem because no particular mechanical adhesive strength is required during use. Even if there is a defect such as a hole or a minute peeling off, the electric resistance is not significantly affected, so that there is no fear that the reliability is lowered due to the formation of the aluminum layer.

It is desirable that the Cr-containing alloy forming the electrode terminal has high reliability in joining with Al or an Al alloy and has excellent workability and weldability. % Iron-based alloy, Ni-based alloy, Co-based alloy, etc. can be used. If the amount of Cr is less than this range, the reliability of the joint with Al or Al alloy is likely to be impaired, and if it is too large, processing into electrode terminals and welding to the positive electrode container / negative electrode container becomes difficult. Specifically, SUS304 (Cr18-20%, Ni8-10.5%) and SU
S430 (Cr16-18%, C0.1%) or the like is preferably used. On the other hand, as Al or Al alloy forming the electrode terminal, pure Al, Al-Mn alloy, Al-Mg alloy, Al
-Cu alloy, Al-Si alloy, etc. can be used. By using these materials to form electrode terminals by joining them by the friction welding method or rolling method described above, the thickness of the intermetallic compound layer formed at the dissimilar material joining interface in the electrode terminals is kept thin,
Even if the electrode terminals are subsequently welded or used for a long time at a battery operating temperature near 350 ° C., the dissimilar material bonding interface is stable, and the reliability of the bonding portion can be kept high.

Also, a Cr-containing alloy can be used as a constituent material of the negative electrode container, and in this case as well as in the case of the electrode terminal, an iron-based alloy having a Cr content of about 13 to 26%, N.
An i-based alloy or a Co-based alloy can be used. It is also possible to use Al or Al alloy for the negative electrode container, and in that case, Al or Al alloy may be used for the electrode terminals as well.

Further, the material for the positive electrode container is required to have excellent corrosion resistance to sulfur and sodium polysulfide, as well as excellent workability and weldability. Co content of 30% by weight or more, Cr Content 18-32
% Co, 0.2% by weight or less Co-based alloy, Ni
Content 40% by weight or more, Cr content 18-32% by weight,
Ni-based alloy with a C content of 0.2% by weight or less, or Fe
It is desirable to use an iron-based alloy containing, as a main component, a Cr content of 22 to 32% by weight and a C content of 0.2% by weight or less.
Specifically, SUS310S (24 to 28 wt% Cr, Ni19
~ 22 wt%, Fe balance) and SUS329J1 (Cr23 ~ 28)
%, Ni 3 to 6% by weight, Mo 3% by weight, Fe remaining), SUS447J1 (Cr 28.5 to 32% by weight, Mo 2% by weight, Fe remaining) and the like are preferably used. If the amount of Cr is less than this range, the corrosion resistance is lowered, and conversely, if it is increased, it becomes difficult to process or weld it to the positive electrode container. When the amount of C is larger than this, not only is it difficult to process the positive electrode container,
During welding, a large amount of chromium carbide precipitates, the residual strain in the weld increases, and the corrosion resistance of the weld deteriorates. In addition, these alloys contain 3 to 15% by weight of W or 1 to 10% by weight of M.
It is particularly desirable that O or 0.2 to 4% by weight of Al is contained because the corrosion resistance is further improved. If the amount of W, Mo and Al is less than this range, the effect of addition is not sufficient, and if it is more than this range, processing into a positive electrode container becomes difficult.

Furthermore, by using the sodium-sulfur battery module of the present invention, the reliability of the battery system is improved, and a highly reliable power storage device, electric vehicle, emergency power supply, uninterruptible power supply, peak cut of the power system. Devices, frequency / voltage stabilizers, etc. can be realized.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

As a specific example, as shown in FIG. 2, a bag tube made of a lithium-doped β ″ -alumina sintered body was used as the solid electrolyte tube. Next, an α-alumina ring was used as the insulating member 17, and the solid electrolyte tube was used. The insulating member 17 and the negative electrode container 12 and the flange 16 were bonded to each other by the hot pressing method using the aluminum-silicon-magnesium alloy foil while bonding the glass to the tube.
SUS329J material is used for the material of 2 and sodium is used inside
8 and SUS wick (not shown) were filled and sealed.
On the other hand, SUS310S is used for the positive electrode container 14 and SUS is used for the flange 16.
Using 329J, these were integrated by TIG welding or electron beam welding. The inside of the positive electrode container was filled with a positive electrode mold 19 made of sulfur and carbon fiber mat.

The electrode terminals 4 and 5 are made of SUS430 or SUS3.
Using a clad material of 04 and Al, the SUS parts 41 and 51, the negative electrode container 12 and the positive electrode container 14 are TIG-welded to form Al.
The parts 42 and 52 and the Al bus bar 6 were spot-welded. These batteries were put into a heat insulating container similar to that shown in FIG. 1 to form a module. When this module was repeatedly charged and discharged at 350 ° C., the resistance of the electrode terminal portion was about 0.4 mΩ per battery, which was about 1/10 of the internal resistance of the battery. In addition, even if this module is charged and discharged at 1500 Ah / cm ² or more, or if the temperature is raised or lowered 30 times or more in the range of room temperature to 350 ° C., or if vibration is applied assuming an earthquake, the battery characteristics and electrode Almost no change was observed in the resistance of the terminal or the resistance of the connection part of the electrode terminal.

By the same method, as a positive electrode container material, C was used.
o Co content 30 wt% or more, Cr content 18-32 wt%, C content 0.2 wt% or less Co-based alloy, Ni content 40 wt% or more, Cr content 18-32 wt%, C content Ni-based alloy in an amount of 0.2 wt% or less, or Fe as a main component, Cr content 22 to 32 wt%, C content 0.2
SUS430 is used as an electrode terminal by using iron-based alloy etc. of less than wt%
Table 1 together with other examples shows an example in which a material obtained by friction-welding an aluminum alloy with an aluminum alloy or a material obtained by rolling a clad material is used.

[0022]

[Table 1]

In Table 1, the change rates of efficiency and capacity are
At a current density of 200 mA / cm ² while 500A / cm ² charging and discharging, shows the rate of change of the efficiency and capacity before and after repeated 30 times decreasing the temperature in the range of 350 ° C. from room temperature. As described above, it was found that a highly reliable sodium-sulfur battery module can be obtained in the desirable material composition range of the present invention. Further, as the electrode terminal, the Cr content is 13
Similar results were obtained when a friction-welded alloy of -26 wt% iron-based alloy, Ni-based alloy or Co-based alloy and Al alloy was used.

A battery having the structure shown in FIG. 3 was prepared in the same manner as in the above embodiment. Here, an aluminum layer 60 having a thickness of 200 μm was sprayed on the outer surfaces of the container and the electrode terminals. The resistance of the electrode terminal when the battery was energized in the same manner as in the above example was 0.2 mΩ, which was reduced to 1/2 of that in the above example. In addition, changes in battery characteristics and electrode terminal resistance due to repeated energization were not observed.

Furthermore, since the characteristics of the module are stable and highly reliable, the battery system using the sodium-sulfur battery module of the present invention is highly reliable. By using this battery system, a highly reliable power storage device, It became clear that electric vehicles, emergency power supplies, uninterruptible power supplies, power system peak cut devices, frequency / voltage stabilizers, etc. could be realized.

[0026]

EFFECTS OF THE INVENTION According to the present invention, the reliability of the connection portion against vibration, temperature rise / fall, and high temperature retention and the reliability of the positive electrode container against corrosion of sulfur and sodium polysulfide can be increased, and a plurality of batteries can be connected. And a highly reliable sodium-sulfur battery module is realized.

Furthermore, by using the sodium-sulfur battery module of the present invention, the reliability of the battery system can be made high, and a highly reliable power storage device, electric vehicle, emergency power supply, uninterruptible power supply, peak cut of the power system. Devices, frequency / voltage stabilizers, etc. are realized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a battery module of the present invention.

FIG. 2 is an explanatory diagram showing an example of a battery module of the present invention.

FIG. 3 is an explanatory diagram showing an example of a battery module of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulation container, 3 ... Sodium sulfur battery, 4,5 ... Electrode terminal, 6 ... Bus bar, 11 ... Solid electrolyte tube, 12, 31 ...
Negative electrode container, 14, 32 ... Positive electrode container, 17 ... Insulating member, 1
8 ... Sodium, 19 ... Positive electrode mold, 60 ... Aluminum layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Makoto 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Tetsuo Koyama 3-Bentencho, Hitachi City, Ibaraki Prefecture No. 10 No. 2 within Hitachi Kyowa Engineering Co., Ltd.

Claims (13)

[Claims] 1. A negative electrode container containing sodium, a positive electrode container containing a positive electrode mold made of sulfur or sodium polysulfide, a sodium ion conductive solid electrolyte separating the negative electrode and the positive electrode, and the solid electrolyte. A sodium-sulfur battery module in which a plurality of sodium-sulfur batteries connected to each other and composed of an insulating member joined to the negative electrode container and the positive electrode container are connected via electrode terminals and housed in a heat-insulating container kept at high temperature. A Cr-containing alloy is used as a material forming the positive electrode container, and a Cr-containing alloy and A are used as the electrode terminals connected to the positive electrode container.
A Cr-containing alloy portion of the electrode terminal and the positive electrode container are joined by using a joining member of 1 or Al alloy, and a plurality of batteries are joined through the Al or Al alloy portion of the electrode terminal. And sodium-sulfur battery module. 2. A sodium-sulfur battery module using an electrode terminal according to claim 1, wherein the low-rigidity portion of the electrode terminal is provided with the joint portion of a Cr-containing alloy and Al or an Al alloy. 3. A sodium-sulfur battery module in which an aluminum layer is formed on the outer surface of the positive electrode container or / and the outer surface of the electrode terminal according to claim 1. 4. A Cr-containing alloy is used as a material forming the negative electrode container according to claim 1, and C is used as the electrode terminal joined to the negative electrode container.
Using a joining member of r-containing alloy and Al or Al alloy,
A sodium-sulfur battery module in which a Cr-containing alloy portion of the electrode terminal is joined to the negative electrode container, and a plurality of batteries are joined via Al or an Al alloy portion of the electrode terminal. 5. A sodium-sulfur battery module using an electrode terminal according to claim 4, wherein the low-rigidity portion of the electrode terminal is provided with the joint portion of a Cr-containing alloy and Al or an Al alloy. 6. A sodium-sulfur battery module having an aluminum layer formed on the outer surface of the negative electrode container and / or the outer surface of the electrode terminal according to claim 4. 7. A sodium-sulfur battery module in which the aluminum layer according to claim 3 or 6 is formed by a thermal spraying method. 8. Al or Al as a material forming the negative electrode container according to any one of claims 1, 2, and 3 and a material forming the electrode terminal joined to the negative electrode container.
Sodium-sulfur battery module using alloy containing. 9. Claims 1, 2, 3, 4, 5, 6, 7 or 8
The electrode terminals are either Al or Al
A sodium-sulfur battery module joined via busbars made of an alloy. 10. The Cr-containing alloy of the electrode terminal according to claim 1, and Al or an Al alloy portion are joined by a mechanical method such as a friction welding method or a rolling method. Sodium-sulfur battery module. 11. A joint between the Cr-containing alloy portion of the electrode terminal according to any one of claims 1, 4, 8 and 9 and the positive electrode container or the negative electrode container, and Al or Al alloy portion of the electrode terminal. Or Al or A of the electrode terminals
1. A sodium-sulfur battery module in which the alloy part and the bus bar are joined by a welding method. 12. The method of claim 1, 2, 3, 4, 5, 6, 7,
The iron-based alloy, the Ni-based alloy, or the Co-based alloy having a Cr content of 13 to 26% by weight is used as the Cr-containing alloy forming the electrode terminal according to any one of 8, 9, 10 and 11, and the positive electrode container Content of Co as a material constituting
Co-based alloys with a weight percentage of 18% to 32 wt% and a C content of 0.2 wt% or less, a Ni content of 40 wt%
As described above, a Ni-based alloy having a Cr content of 18 to 32% by weight and a C content of 0.2% by weight or less, or Fe as a main component, and C
A sodium-sulfur battery module using an iron-based alloy having an r content of 22 to 32% by weight and a C content of 0.2% by weight or less. 13. The method of claim 1, 2, 3, 4, 5, 6, 7,
A power storage device using the sodium-sulfur battery module according to any one of 8, 9, 10, 11 or 12.
Battery systems for electric vehicles, emergency power supplies, uninterruptible power supplies, power system peak cut devices, frequency / voltage stabilizers, etc.