KR20140022687A - Sodium-sulfur rechargeable battery - Google Patents

Abstract

Disclosed is a sodium-sulfur battery, comprising: an anode chamber for accommodating sulfur; a cathode chamber for accommodating sodium; a battery for charging and discharging which comprises a sold electrolyte that selectively and exclusively moves sodium ions by being installed between the anode and the cathode chambers; and a sodium removing part which removes sodium in the cathode chamber selectively by being connected to the cathode chamber. Thus, the sodium-sulfur battery can improve the safety of the battery, and minimize the reaction between sodium and sulfur by removing the sodium in the battery in case of emergency.

Description

[0001] SODIUM-SULFUR RECHARGEABLE BATTERY [0002]

The present invention relates to a sodium sulfur battery. More particularly, the present invention relates to a sodium sulfur battery having enhanced safety.

Generally, a sodium-sulfur battery is developed as a large-capacity power storage battery because of its high energy density, charge / discharge efficiency, self-discharge, and irregular charge / discharge characteristics.

Sodium sulfur batteries use sodium alumina (Na) as the cathode, sulfur (S) as the anode, and beta-alumina ceramics of the solid electrolyte having sodium ion conductivity as the electrolyte. The sodium sulfur battery includes an anode tube enclosing an electrolyte tube and an electrolyte tube. The electrolyte tube has a structure in which a beta-alumina ceramic having a property of passing only sodium ions is formed in a tube shape. The inside of the electrolyte tube is filled with sodium, and sulfur and carbon felt are placed between the electrolyte tube and the positive electrode container. The sodium ion is transferred between the cathode and the anode through the beta alumina, which is an electrolytic tube, to charge and discharge the battery.

In the case of sodium sulfur battery, when the electrolytic tube is broken during operation, the sulfur of the anode flows into the cathode through the breakage portion of the electrolytic tube, and thereby contacts with the sodium of the cathode to cause a rapid chemical reaction.

Sodium and sulfur will produce sodium sulphide upon contact. The sulfide formation reaction is an exothermic reaction in which the enthalpy change is about -380 to -470 KJ / mole at 300 ° C. Therefore, there is a risk that the battery will fire or explode when sulfur in the anode is reacted with a large amount of sodium in the negative electrode. The sodium sulfur cell contains up to about 700-800 g of sodium in the cell, and assumes all sodium and sulfur react, it emits up to about 6 ~ 7 MJ of energy, and the temperature of the cell instantaneously rises above 1000 ℃.

The conventional sodium sulfur battery is provided inside the electrolyte tube is provided with a safety tube to block the inflow of sulfur when the electrolyte tube breaks. The safety tube is expanded due to a sudden temperature rise due to the exothermic reaction of sulfur and sodium when the electrolyte tube is broken and is in close contact with the inner surface of the electrolyte tube. As a result, the supply of sodium to the damaged area is blocked to prevent further chemical reaction and heat generation.

However, the above-described conventional battery has a large amount of sodium from the negative electrode container as the temperature around the electrolyte tube breakage rises above the melting point of the metal safety tube due to instantaneous mass heat generation when the local electrolyte tube breaks. Has a fundamental problem of inducing an explosive exothermic reaction. Further, there is a problem that the reaction of sodium and sulfur continues after the rapid reaction occurs.

Thus, there is provided a sodium sulfur battery that can further improve the safety of the battery.

In addition, it provides a sodium sulfur battery that can minimize the reaction of sodium and sulfur by removing sodium from within the cell in case of emergency.

This sodium sulfur battery,

A battery unit including charge and discharge, including a positive electrode chamber containing sulfur, a negative electrode chamber containing sodium, and a solid electrolyte which selectively moves only sodium ions between the positive electrode chamber and the negative electrode chamber;

It may include a sodium removal unit connected to the cathode chamber to selectively remove sodium in the cathode chamber.

The sodium sulfur battery may further include a negative electrode container disposed outside the battery unit, accommodating sodium therein, and connected to the negative electrode chamber to supply sodium.

The battery unit has a positive electrode container having an upper end opening and forming the positive electrode chamber therein, a solid electrolyte installed in the positive electrode container and forming a negative electrode chamber therein, and installed between the positive electrode container and the solid electrolyte and having a positive electrode chamber and a negative electrode chamber. It may include an insulator for insulating between, the negative electrode plate is installed in the insulator to block the cathode chamber inside the solid electrolyte.

The inner surface of the solid electrolyte is provided at intervals, and may further include a safety tube for forming the cathode chamber between the solid electrolyte.

The battery unit includes a positive electrode container having both ends open and forming the positive electrode chamber therein, a solid electrolyte installed in the positive electrode container and having both ends open and forming a negative electrode chamber therein, and disposed at both ends of the positive electrode container, respectively. And an insulator installed between the positive electrode container and the solid electrolyte to insulate between the positive electrode chamber and the negative electrode chamber, and a negative electrode plate installed in the insulator to block the negative electrode chamber inside the solid electrolyte.

The battery unit may further include a porous foam filled with sodium by being formed in the cathode chamber and having open cell pores therein.

The sodium removing unit is connected to the cathode chamber and extends to the outside of the anode vessel to transport sodium, a vacuum tank connected to the discharge tube and having a vacuum pressure formed therein, and an on / off valve installed at one side of the discharge tube to open and close the discharge tube. It may include.

The sodium removing unit may further include a temperature sensor for detecting a temperature of the battery unit, and a controller configured to control and operate the open / close valve by calculating a detection value of the temperature sensor.

The negative electrode container may be disposed above the battery unit, and the sodium removing unit may be disposed below the battery unit.

The sodium removing unit may have a structure connected to the bottom of the cathode chamber.

The sodium removing unit may have a structure in which a discharge pipe is connected to the bottom of the negative electrode chamber and extends downward through the negative plate installed at the bottom of the battery unit.

The sodium removing part may have a structure in which a discharge pipe extends to the upper part of the battery part and extends to the inner bottom through the negative plate installed at the top.

As described above, according to this embodiment, sodium is supplied to the inside of the battery only from the outside of the battery to react with the sulfur, so that a phenomenon in which a large amount of sodium reacts with sulfur when the solid electrolyte breaks down can be fundamentally blocked.

This reduces the risk of battery explosion and increases the safety of the battery.

In addition, by minimizing the size of the cathode chamber, the amount of sodium present in the battery is sufficiently lowered compared with the conventional one, thereby reducing the amount of heat generated by the battery during the breakage of the solid electrolyte and reducing the risk of explosion.

In addition, when a high temperature is generated due to a sudden reaction due to battery breakage, by discharging the entire amount of sodium to the outside, rapid reaction between sulfur and sodium can be minimized and safety can be further improved.

1 is a cross-sectional view illustrating a sodium sulfur battery according to a first embodiment.
2 is a cross-sectional view illustrating a sodium sulfur battery according to a second embodiment.
3 is a cross-sectional view illustrating a sodium sulfur battery according to a third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

1 shows a sodium sulfur battery according to a first embodiment.

Referring to FIG. 1, the sodium sulfur battery 100 of the present embodiment is provided with a battery unit 10 in which charging and discharging is performed, and a negative electrode container 50 that is provided separately from the battery unit 10 to accommodate sodium and supply sodium to the battery unit. ), And a sodium removal unit 60 for selectively removing sodium from the battery unit 10.

In the present embodiment, the battery unit 10 is formed in the positive electrode chamber 12 therein to accommodate the positive electrode vessel 14, and the solid is installed in the positive electrode container 14 and selectively moves only sodium ions. Safety tube 18, the positive electrode container 14 and the electrolyte 16, which is provided at intervals on the inner surface of the solid electrolyte 16, and forms a cathode chamber 24 for receiving sodium between the solid electrolyte 16 It is provided between the solid electrolyte and the insulator 20 to insulate the anode chamber 12 and the cathode chamber 24.

The anode vessel 14 is disposed outside the solid electrolyte 16, and forms an anode chamber 12 in which sulfur is accommodated. In the anode chamber 12, a felt collector 22 filled with sulfur is filled with the solid electrolyte 16. The felt current collector 22 is, for example, carbon felt having pores formed therein, and sulfur is contained in the pores. In the present embodiment, the positive electrode container 14 is made of a cylindrical shape with an open top, and is made of a metal material such as aluminum or stainless steel. In addition, a corrosion resistant layer containing chromium, molybdenum or the like as a main component may be coated on the surface of the positive electrode container 14. The positive electrode container 14 forms an external shape of a battery and may also serve as an external terminal of the positive electrode.

The safety tube 18 is installed at a predetermined interval inside the solid electrolyte 16. The safety tube 18 is inflated to the outside by the high heat generated by the exothermic reaction of sulfur and sodium introduced during breakage of the solid electrolyte 16 to be in close contact with the inner surface of the solid electrolyte 16.

The safety tube 18 is a tubular structure having an open top, and is disposed while maintaining a clearance with an inner surface of the solid electrolyte 16. The gap between the solid electrolyte 16 and the safety tube 18 forms a cathode chamber 24 containing sodium. The sodium in the negative electrode container 50 is introduced between the safety tube 18 and the solid electrolyte 16 to fill the negative electrode chamber 24.

The solid electrolyte 16 is made of beta alumina ceramic capable of passing sodium ions. In the present embodiment, the solid electrolyte 16 is formed in the form of an open top tube at intervals inside the positive electrode container. A cathode chamber is formed between the cathode vessel and the solid electrolyte.

An insulator 20 is installed between the solid electrolyte 16 and the positive electrode container 14. The insulator 20 is insulated between the anode vessel 14 constituting the anode chamber and the safety tube 18 constituting the cathode chamber to prevent short. The insulator 20 is a ring-shaped structure made of alpha alumina ceramic and is bonded to the upper portion of the anode container 14. The solid electrolyte 16 is bonded to the inner surface of the insulator 20 through a glass bonding process, and the anode vessel 14 is bonded to the outer surface through a thermal compression bonding (TCB) process. Above the safety tube 18, a negative electrode plate 28 for collecting electrons from the negative electrode chamber 24 and sealing the negative electrode chamber 24 is provided.

The negative electrode container 50 may be separated from the battery unit 10 and disposed above the battery unit 10. Alternatively, the battery unit 10 may be installed at a position spaced apart from the battery unit 10. The negative electrode container 50 is sufficient to be provided separately to the outside of the battery unit 10 and the installation position is not particularly limited. The cathode container 50 may be made of a metal material, such as aluminum, stainless steel.

The cathode container 50 is filled with sodium inside. In addition, an inert gas such as nitrogen gas or argon gas may be filled in the cathode container at a predetermined pressure. The inert gas creates a pressing force that pushes the sodium in the cathode vessel through the sodium feed.

The negative electrode container 50 has a structure in which sodium flows through a transfer tube 52 connecting the safety tube 18 between the battery units. As shown in FIG. 1, the transfer pipe 52 is connected between the safety tube 18 and the solid electrolyte 16 through the negative electrode plate 28. The sodium supplied to the transfer pipe 52 is supplied to the cathode chamber 24 between the solid electrolyte 16 and the safety tube 18 to fill the cathode chamber 24. The negative electrode chamber 24 is connected through the transfer tube 52, so that sodium flows between the negative electrode container and the battery unit through the transfer tube 52 according to the battery reaction.

As such, by separating the negative electrode container from the battery unit and supplying only the amount of sodium necessary for the battery reaction to the battery unit in real time, a large amount of exothermic reaction can be blocked even if the solid electrolyte is damaged.

On the other hand, the present battery has a structure in which sodium in the negative electrode chamber 24 of the battery unit is removed through the sodium removing unit 60 if necessary.

To this end, the sodium removing unit 60 is connected to the cathode chamber 24 and extends outside the anode vessel 14 to discharge sodium 62 to be transferred, and connected to the discharge tube 62 and filled inside. The vacuum tank 64 is formed with a pneumatic pressure, and the opening and closing valve 66 is installed on one side of the discharge pipe 62 to open and close the discharge pipe 62.

Accordingly, when sodium and sulfur rapidly react with the battery, the sodium valve may be forced out of the cell by using the vacuum pressure of the vacuum tank 64 by opening the opening / closing valve 66. do. As such, by forcibly discharging sodium from the cathode chamber 24 to the vacuum tank 64 in an emergency situation, sodium does not remain in the battery unit, thereby minimizing the reaction between sodium and sulfur.

The vacuum tank 64 is maintained in a vacuum state in which the on-off valve 66 is closed in a closed structure in a state where a vacuum is formed therein. The vacuum pressure applied to the inside of the vacuum tank 64 is not particularly limited as long as it can sufficiently inhale sodium in the cathode chamber 24. The vacuum tank 64 is disposed in the opposite direction of the negative electrode container 50 with the battery unit 10 therebetween. In the present embodiment, the negative electrode container 50 is disposed above the battery unit 10, and the sodium removing unit 60 is disposed below the battery unit 10. Here, the upper means upper when the open upper end of the positive electrode container is upward, and the lower means lower side opposite to the opposite side. As a result, sodium can be easily escaped to the vacuum tank 64 located below the battery unit 10 more quickly. The internal volume of the vacuum tank 64 is sufficient to accommodate all the sodium used in the battery and is not particularly limited.

The discharge pipe 62 is connected to the bottom of the cathode chamber 24. In the present embodiment, the discharge pipe 62 extends down past the negative electrode plate 28 at the top of the battery unit, so that the bottom of the negative electrode chamber 24, that is, the negative electrode chamber between the solid electrolyte 16 and the safety tube 18 ( 24) Connected to the floor. Sodium is collected by gravity to the bottom of the cathode chamber 24, it is possible to discharge all the sodium in the cathode chamber 24 through the discharge pipe 62 connected to the bottom of the cathode chamber 24. The discharge pipe 62 extending beyond the negative electrode plate 28 to the outside of the battery unit extends below the battery unit and is connected to the vacuum tank 64 positioned below the battery unit.

In the present embodiment, the on-off valve 66 has a structure in which control is operated when high heat is generated by a sudden reaction of the battery unit. To this end, the sodium removing unit further includes a temperature sensor 68 for detecting the temperature of the battery unit, and a controller 70 for controlling the open / close valve 66 by calculating the detected value of the temperature sensor 68. do. The temperature sensor 68 may be installed at a position capable of accurately detecting a sudden temperature change of the battery unit.

On the other hand, Fig. 2 shows another embodiment of the sodium sulfur battery.

The battery of this embodiment is the same as the other embodiments mentioned above except for the structure of the battery unit. The same reference numerals are used for the same components, and a detailed description thereof will be omitted.

As shown in FIG. 2, the battery 100 includes a battery unit 10 in which charging and discharging is performed, and a negative electrode container 50 that receives sodium and supplies sodium to the battery unit separately from the battery unit 10. And a sodium removing unit 60 for selectively removing sodium from the battery unit 10.

In the present exemplary embodiment, the battery unit 10 includes a positive electrode container 14 having an upper end opened and forming the positive electrode chamber 12 therein, a solid electrolyte 16 installed in the positive electrode container and having an open upper end, An insulator 20 disposed between the positive electrode container 14 and the solid electrolyte 16, a negative electrode plate 28 disposed on the insulator to block the negative electrode chamber 24 inside the solid electrolyte, and the negative electrode chamber 24. It is installed in the pores of the open cell form is formed therein includes a porous foam 30 filled with sodium.

The porous foam 30 may be made of a porous metal made of metal. Sodium is filled in the internal pores of the porous foam.

The porous foam 30 has a shape and size corresponding to that of the cathode chamber 24 formed inside the solid electrolyte, and is filled in the cathode chamber. The porous foam 30 of the cathode chamber is insulated from the anode vessel 14 by the insulator 20 to prevent short.

The transfer pipe 52 connected to the negative electrode container 50 extends through the negative electrode plate 28 to the negative electrode chamber 24 and is connected to the top of the porous foam 30. Sodium distributed through the transfer pipe is filled into the pores of the porous foam.

The sodium removal part 60 of this embodiment is the same as the structure mentioned above. However, the discharge pipe 62 connected to the vacuum tank 64 is connected to the bottom of the cathode chamber 24 through the porous foam 30. That is, the discharge pipe 62 passes through the negative electrode plate 28 at the top of the battery unit, passes through the porous foam installed in the negative electrode chamber, and extends to the bottom of the negative electrode chamber 24.

3 shows another embodiment of a sodium sulfur battery.

In the following description, the same reference numerals are used for the same components as the above-described other embodiments, and detailed description thereof will be omitted.

As shown in FIG. 3, the sodium sulfur battery 100 according to the present embodiment is provided with a battery unit 40 in which charging and discharging is performed, and is provided separately from the battery unit 10 to accommodate sodium and supply sodium to the battery unit. 50, a sodium removing unit 60 for selectively removing sodium from the battery unit 10.

In the present embodiment, the battery unit 40 has a positive electrode container 42 having both ends open and forming the positive electrode chamber 41 therein, and a solid body installed in the positive electrode container 42 with both ends opened. Insulators 20 and 21 disposed at both ends of the electrolyte 43 and the positive electrode container 42, respectively, and disposed between the solid electrolyte 43 and the both ends of the insulator 20 and 21, respectively. (43) includes cathode plates 28 and 29 that block the interior to form cathode chambers 45 containing sodium therein.

In addition, the battery unit 40 may further include a porous foam 46 filled with sodium by being formed in the cathode chamber 45 and having pores of an open cell shape formed therein. The porous foam 46 may be made of a porous metal made of metal. Sodium is filled in the internal pores of the porous foam 46. In the cathode chamber, various structures for receiving sodium in addition to the porous foam may be installed, for example, safety tubes.

In the battery unit 40 of the present embodiment, the negative electrode plates 28 and 29 are installed at the upper and lower ends of the negative electrode chamber 45, respectively, so that the negative electrode container 50 and the sodium removing unit 60 are placed in the negative electrode chamber 45. It can be connected very easily.

The positive electrode container 42 forms a positive electrode chamber 41 in an area between the insulators 20 and 21 installed at the upper and lower ends, respectively, and the solid electrolyte 43 therein. The positive electrode chamber 41 is filled with a felt collector 44 containing sulfur between the solid electrolyte 43. The felt collector 44 is, for example, carbon felt having pores formed therein, and sulfur is contained in the pores. The positive electrode container 42 is made of, for example, the upper and lower ends of an open shape and is made of a metal material such as aluminum or stainless steel. In addition, the surface of the anode container 42 may be coated with a corrosion resistant layer containing chromium, molybdenum and the like as a main component. The positive electrode container 42 forms an external appearance of a battery and may also serve as an external terminal of the positive electrode.

The solid electrolyte 43 is made of beta alumina ceramic that can pass sodium ions. In the present embodiment, the solid electrolyte 43 is formed at an upper end and a lower end in an open shape, and is installed at intervals inside the positive electrode container 42. The solid electrolyte 43 forms a cathode chamber 45.

Insulators 20 and 21 are installed between the solid electrolyte 43 and the positive electrode container 42. The insulators 20 and 21 are made of alpha alumina ceramic. The insulators 20 and 21 insulate between the positive electrode container 42 constituting the positive electrode chamber and the porous foam 46 of the negative electrode chamber 45 to prevent short. Two insulators 20 and 21 are formed in a pair, and are bonded to upper and lower ends of the positive electrode container 42, respectively. The two insulators 20 and 21 may have the same structure and may be disposed to face each other.

The solid electrolyte 43 is bonded to the inner surfaces of the insulators 20 and 21 through a glass bonding process, and the anode vessel 42 is bonded to the outer surfaces through a thermal compression bonding (TCB) process. Negative electrode plates 28 and 29 are installed at upper and lower ends of the battery unit to seal the negative electrode chamber 45 inside the solid electrolyte 43.

Thus, when the battery unit is erected on the ground, the negative electrode plates 28 and 29 are positioned at the upper and lower ends, respectively, and the negative electrode container 50 and the sodium removing unit 60 are negatively connected through the negative electrode plates 28 and 29. The thread 45 can be easily connected.

The transfer pipe 52 connected to the negative electrode container 50 extends through the negative electrode plate 28 on the top of the battery unit 40 to the negative electrode chamber 45 and is connected to the top of the porous foam 46. Sodium passed through the transfer pipe 52 is filled into the pores of the porous foam 46.

The sodium removal part 60 of this embodiment is the same as the structure mentioned above. However, the discharge pipe 62 connected to the vacuum tank 64 is directly connected to the bottom of the negative electrode chamber 45 through the negative plate 29 installed at the bottom of the battery unit 40. That is, the discharge pipe 62 extends upward from the vacuum tank 64 disposed below the battery unit 40, and is directly connected to the bottom of the negative electrode chamber 45 through the negative electrode plate 29.

Hereinafter, the operation of the sodium sulfur battery according to the embodiment of FIG. 1 will be described. The battery of the embodiment illustrated in FIGS. 2 and 3 also has the same function.

As shown in FIG. 1, the liquid sodium is supplied from the sodium container 50 filled with sodium to the cathode chamber 24 of the battery unit 10 through the transfer pipe 52. The amount of sodium supplied is the amount of sodium required for the battery reaction, and may be determined as the minimum amount of sodium to be supplied to the cathode chamber according to the size or structure of the battery compartment. Thus, only sodium necessary for battery reaction can be accommodated in the cathode chamber 24. Therefore, only the minimum sodium remains in the battery unit 10, it is possible to prevent the phenomenon that a large amount of sodium reacts with sulfur when the solid electrolyte 16 is damaged.

On the other hand, when sodium in the negative electrode chamber reacts directly with the sulfur in the positive electrode chamber due to breakage of a solid electrolyte or the like as the battery is driven, high heat is generated by rapid reaction. When high heat is generated inside the battery, the temperature sensor 68 of the apparatus detects this, and the controller 70 that calculates the detection value of the temperature sensor 68 opens the opening / closing valve 66.

As the open / close valve 66 is opened, the vacuum tank 64 and the negative electrode chamber 24 of the battery communicate with each other through the discharge pipe 62. The vacuum tank 64 has a vacuum pressure formed therein, and the cathode chamber 24 receives the vacuum pressure of the vacuum tank through the discharge pipe 62. Therefore, sodium in the cathode chamber 24 is sucked into the vacuum tank 64 through the discharge pipe 62 in an instant.

In this way, as sodium in the negative electrode chamber escapes from the negative electrode chamber into the vacuum tank provided outside the battery, sodium inside the battery does not remain to react with sulfur. Therefore, the direct reaction between sodium and sulfur will no longer occur and the safety of the battery can be ensured.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10,40: battery part 12,41: anode chamber
14,42 positive electrode container 16,43 solid electrolyte
18: safety tube 20, 21: insulator
24,44 cathode chamber 50 cathode container
52: transfer pipe 60: sodium removal unit
62: discharge pipe 64: vacuum tank
66: on-off valve 68: temperature sensor
70: controller

Claims (13)

A battery unit including charge and discharge, including a positive electrode chamber containing sulfur, a negative electrode chamber containing sodium, and a solid electrolyte which selectively moves only sodium ions between the positive electrode chamber and the negative electrode chamber;
Sodium removal unit connected to the cathode chamber to selectively remove sodium in the cathode chamber
≪ / RTI > The method of claim 1,
And a cathode container disposed outside the battery unit and accommodating sodium therein and connected to the cathode chamber to supply sodium. 3. The method according to claim 1 or 2,
The sodium removing unit is connected to the cathode chamber and extends to the outside of the anode vessel to transport sodium, a vacuum tank connected to the discharge pipe and having a vacuum pressure formed therein, and an opening / closing valve installed at one side of the discharge pipe to open and close the discharge pipe. Sodium sulfur battery comprising a. The method of claim 3, wherein
The sodium removing unit further comprises a temperature sensor for detecting the temperature of the battery unit, and a controller for controlling the opening and closing valve by calculating the detected value of the temperature sensor. 5. The method of claim 4,
The sodium removal unit is a sodium sulfur battery disposed in the lower portion of the battery unit. 5. The method of claim 4,
The sodium removal unit of the sodium sulfur battery of the structure connected to the bottom of the cathode chamber. The method according to claim 6,
The sodium removing unit is a sodium sulfur battery structure of the discharge pipe is connected to the bottom of the negative electrode chamber and extends to the outer bottom through the negative plate installed at the bottom of the battery unit. The method according to claim 6,
The sodium removal unit is a sodium sulfur battery structure of the discharge pipe extending to the inner bottom through the negative plate installed on the top extending to the top of the battery unit. 5. The method of claim 4,
The battery unit has a positive electrode container having an upper end opening and forming the positive electrode chamber therein, a solid electrolyte installed in the positive electrode container and forming a negative electrode chamber therein, and installed between the positive electrode container and the solid electrolyte and having a positive electrode chamber and a negative electrode chamber. Sodium sulfur battery comprising an insulator to insulate between, the negative electrode plate provided on the insulator to block the cathode chamber inside the solid electrolyte. The method of claim 9,
Sodium sulfur battery further comprises a safety tube provided on the inner surface of the solid electrolyte spaced apart, forming the cathode chamber between the solid electrolyte. The method of claim 9,
The battery unit is installed in the cathode chamber, the open-cell type pores are formed therein further comprises a sodium-filled porous foam sodium sodium battery. 5. The method of claim 4,
The battery unit includes a positive electrode container having both ends open and forming the positive electrode chamber therein, a solid electrolyte installed in the positive electrode container and having both ends open and forming a negative electrode chamber therein, and disposed at both ends of the positive electrode container, respectively. And an insulator installed between the cathode container and the solid electrolyte to insulate between the anode chamber and the cathode chamber, and installed on each of the insulators, and including a cathode plate blocking the cathode chamber inside the solid electrolyte. 13. The method of claim 12,
The battery unit is installed in the cathode chamber, the open-cell type pores are formed therein further comprises a sodium-filled porous foam sodium sodium battery.

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