JP2011129393A - Solid battery and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid battery and a method of manufacturing the same, capable of reducing internal resistance. <P>SOLUTION: The solid battery includes an axis center member, a cylindrical electrode body arranged around the axis center member, and a case housing the axis center member and the electrode body. The electrode body includes a cathode, an anode, and a solid electrolyte layer arranged between the cathode and the anode. As a component of the axis center member, a material with a larger coefficient of thermal expansion than that of the case is contained. The manufacturing method of the solid battery which contains a material with a larger coefficient of thermal expansion than that of the case for a component of the axis center member, includes a process for manufacturing a structure body equipped with the axis center member and the cylindrical electrode by forming the cylindrical electrode body having a cathode, an anode and a solid electrolyte layer arranged between the cathode and the anode around the axis center member with its temperature retained lower than the normal temperature, a process for housing the manufactured structure body into the case while retaining the axis center member as a lower temperature than the normal temperature, and restraining circumference of the structure body, and a process for raising the temperature of the axis center member more than the normal temperature after the former process. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid battery and a method for manufacturing the same, and more particularly, to a solid battery having a wound solid electrolyte layer and a method for manufacturing the same.

  A lithium ion secondary battery has the characteristics that it has a higher energy density than other secondary batteries and can operate at a high voltage. For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large motive power such as for electric vehicles and hybrid vehicles.

  A lithium ion secondary battery includes a positive electrode and a negative electrode, and an electrolyte disposed between them. Known electrolyte forms include those made of liquid or solid. When a liquid electrolyte (hereinafter referred to as “electrolytic solution”) is used, the electrolytic solution penetrates into the positive electrode. Therefore, the interface between the positive electrode active material constituting the positive electrode and the electrolyte is easily formed, and the performance is easily improved. However, since the widely used electrolyte is flammable, it is necessary to mount a system for ensuring safety. On the other hand, since the solid electrolyte is nonflammable, the above system can be simplified. Therefore, a lithium ion secondary battery (hereinafter, referred to as “solid battery”) having a layer containing a non-combustible solid electrolyte (hereinafter, sometimes referred to as “solid electrolyte layer”). Has been proposed.

  As a technology related to such a solid battery, for example, Patent Document 1 discloses that a positive electrode having a positive electrode lead portion at one end portion in the short direction of the positive electrode substrate and a negative electrode lead portion at one end portion in the short direction of the negative electrode substrate. A battery element having a negative electrode having a solid electrolyte layer interposed between the positive electrode and the negative electrode, and the positive electrode lead portion and the negative electrode lead portion are electrically connected to the outside over the entire length of each electrode. A battery is disclosed. And in patent document 1, a positive electrode and a negative electrode are laminated | stacked through an electrolyte layer in the state arrange | positioned so that a positive electrode exposed part and a negative electrode exposed part may become a mutually opposing direction in the short direction of a positive electrode substrate and a negative electrode substrate. In addition, the positive electrode exposed portion and the negative electrode exposed portion are stacked at one end of the positive electrode and the negative electrode by being wound or folded in the longitudinal direction of the positive electrode substrate and the negative electrode substrate, and the stacked positive electrode exposed portion and negative electrode exposed The form of the battery element in which the parts are laminated and integrated is also disclosed.

JP 2003-188771 A

  According to the technique disclosed in Patent Document 1, since the structure is formed by winding a laminate in which a positive electrode, a solid electrolyte layer, and a negative electrode are laminated, the energy density of the solid battery is increased. It will be possible. However, with the technique disclosed in Patent Document 1, it is difficult to ensure a sufficient fastening pressure. Therefore, there has been a problem that the resistance of mass transfer at the interface between the stacked layers is likely to increase, and it is difficult to reduce the internal resistance.

  Then, this invention makes it a subject to provide the solid battery which can reduce internal resistance, and its manufacturing method.

In order to solve the above problems, the present invention takes the following means. That is,
A first aspect of the present invention includes an axial member, a cylindrical electrode body disposed around the axial member, and a housing that accommodates the axial member and the electrode body. Has a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, and the constituent material of the shaft member includes a material having a higher coefficient of thermal expansion than the housing It is a solid state battery characterized by these.

In the present invention, the “material having a high coefficient of thermal expansion” is not limited to metals, plastics, and ceramics, and a material having a linear expansion coefficient of 10 × 10 ⁻⁶ / ° C. or higher, preferably 45 × 10 ⁻⁶ / ° C. or higher. Say. Specifically, rubbers such as nitrile rubber, styrene butadiene rubber, fluorine rubber, and silicone rubber, plastics such as polypropylene, polyethylene, polyethylene terephthalate, and polycarbonate can be used.

  In the first aspect of the present invention, a process of winding a sheet-like electrode body having a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, with the shaft member as a center. It is preferable that the cylindrical electrode body is formed through this.

  According to a second aspect of the present invention, a cylindrical electrode body having a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode around a shaft member maintained at a temperature lower than normal temperature. Forming a structure including a shaft member and a cylindrical electrode body, and a structure manufacturing step while maintaining the shaft member at a temperature lower than room temperature. A housing step of housing the structure in a housing and restraining the periphery of the structure, and a heating step of setting the shaft member to a temperature equal to or higher than room temperature after the housing step, In the method for producing a solid state battery, a material having a higher thermal expansion coefficient than that of the casing is included in the constituent material.

  In the second aspect of the present invention, the structure manufacturing step undergoes a process of laminating the positive electrode, the negative electrode, and the solid electrolyte layer so that the solid electrolyte layer is disposed between the positive electrode and the negative electrode. After producing a sheet-like electrode body comprising a positive electrode, a negative electrode, and a solid electrolyte layer, the produced sheet-like electrode body is wound around an axial center member maintained at a temperature lower than room temperature. It is preferable that the process is a process for manufacturing a structure.

  In the first aspect of the present invention, the electrode body is disposed between the casing and the shaft member using a material having a high coefficient of thermal expansion. When the solid battery is used, the temperature rises more than before use. Therefore, with this configuration, the shaft member can be expanded when the solid battery is used. When the axial member disposed inside the cylindrical electrode body (axial center side; the same applies hereinafter) expands, when a solid battery is used, pressure is applied from the inner side to the outer side of the electrode body; That is, since it is possible to apply a fastening pressure to the electrode body, it is possible to reduce internal resistance. Therefore, according to the present invention, a solid state battery capable of reducing internal resistance can be provided.

  1st aspect of this invention WHEREIN: The process of winding the sheet-like electrode body which has a positive electrode, a negative electrode, and the solid electrolyte layer arrange | positioned between the positive electrode and the negative electrode centering on an axial center member is carried out. Then, by forming the cylindrical electrode body, it becomes possible to improve the productivity of the solid state battery having the above effect.

  The second aspect of the present invention is a cylindrical member formed around the shaft member and the shaft member while maintaining the shaft member containing a material having a high coefficient of thermal expansion at a temperature lower than room temperature. After producing the structure which comprises an electrode body, restraining the circumference | surroundings of this structure, it has the heating process which makes the temperature of a shaft center member the temperature more than normal temperature. By manufacturing the solid battery through such a process, the shaft center member can be expanded in the heating process. It is possible to apply pressure from the inside to the outside of the electrode body, that is, to apply a fastening pressure to the electrode body, by expanding the shaft member disposed inside the cylindrical electrode body. As a result, the internal resistance can be reduced. Therefore, according to this invention, the manufacturing method of a solid battery which can manufacture the solid battery which can reduce internal resistance can be provided.

  In the second aspect of the present invention, the positive electrode, the negative electrode, and the solid are passed through a process of laminating the positive electrode, the negative electrode, and the solid electrolyte layer so that the solid electrolyte layer is disposed between the positive electrode and the negative electrode. After producing a sheet-like electrode body comprising an electrolyte layer, the structure is obtained by winding the produced sheet-like electrode body around a shaft member maintained at a temperature lower than room temperature. By being manufactured, in addition to the above effects, it is possible to provide a method of manufacturing a solid battery capable of improving productivity.

It is sectional drawing which shows the example of a form of the solid battery of this invention. It is a flowchart explaining the manufacturing method of the solid battery of this invention.

  As a result of earnest research, the present inventor has found that when the solid battery is constrained using a conventional technique that applies pressure from the outside of the cylindrical electrode body, the resistance increase rate (the resistance value after 20 cycles is the resistance value after 1 cycle) It has been found that a very large surface pressure (for example, a surface pressure of 44 MPa or more) is required to make the value divided by a value less than a certain value (for example, 120% or less). However, even if a large surface pressure is applied to reduce the rate of increase in resistance, if the volume of the solid battery is reduced with use, the surface pressure is likely to be reduced. When the surface pressure is reduced, the rate of increase in resistance is likely to increase, and the durability characteristics are likely to be reduced. Therefore, there has been a limit to the reduction in internal resistance using the conventional technology. Furthermore, in the conventional technique in which surface pressure is applied from the outside of the cylindrical electrode body, restraint unevenness is likely to occur in the axial direction of the electrode body. Easy to rise. In addition, in the conventional restraint in which a very large surface pressure is applied from the outside of the electrode body, only the outside of the electrode body is pressed every time the restraint is performed again. Therefore, there is a concern that the output of the solid battery is reduced due to the deterioration of the active material.

  Based on the above findings, the present inventor studied a solid state battery capable of reducing internal resistance by applying a fastening pressure from the inside to the outside of the cylindrical electrode body and a method for manufacturing the same. As a result, a shaft center member kept at a low temperature using a material having a high coefficient of thermal expansion is arranged inside the cylindrical electrode body, and after the electrode body is accommodated in the housing, the shaft center member It has been found that by increasing the temperature, it is possible to continue to apply the fastening pressure from the inside to the outside of the electrode body, and to reduce the internal resistance. Furthermore, by applying a fastening pressure from the inside to the outside of the electrode body, the fastening pressure applied from the outside to the inside of the electrode body can be reduced as compared with the conventional case. It becomes possible to reduce restraint unevenness. Therefore, charging unevenness can be reduced, and the degree of deterioration of battery characteristics such as high-rate charge / discharge characteristics and durability characteristics can be reduced / suppressed. In addition, in a lithium ion battery using an electrolytic solution, if the electrolytic solution is kept at a low temperature during production, the electrolytic solution freezes or the electrolytic solution is impregnated unevenly, so that it is difficult to increase the output of the battery. There is concern about the situation. However, in the case of a solid electrolyte, such a situation is not a concern. Therefore, even if a solid battery is manufactured through a process of disposing a low-temperature shaft member, it is considered that the output does not decrease.

  The present invention has been made based on these findings. The main gist of the present invention is to provide a solid state battery capable of reducing internal resistance and a method for manufacturing the same.

  The present invention will be described below with reference to the drawings. In addition, the form shown below is an illustration of this invention and this invention is not limited to the form shown below.

  FIG. 1 is a cross-sectional view showing an example of a solid battery according to the present invention. The back / front direction in FIG. 1 is the axial direction of the cylindrical electrode body, and FIG. 1 shows an extracted characteristic portion of the solid state battery of the present invention. As shown in FIG. 1, a solid battery 10 according to the present invention includes a cylindrical electrode body 1 and a columnar shaft center member 2 disposed on the axis of the electrode body 1. A housing 3 is disposed around the. The electrode body 1 has a cylindrical negative electrode 1a, a cylindrical solid electrolyte layer 1b, and a cylindrical positive electrode 1c. The inner peripheral surface of the solid electrolyte layer 1b is in contact with the outer peripheral surface of the negative electrode 1a, The outer peripheral surface of the electrolyte layer 1b is in contact with the inner peripheral surface of the positive electrode 1c. Further, the outer peripheral surface of the shaft member 2 is in contact with the inner peripheral surface of the negative electrode 1 a, and the outer peripheral surface of the positive electrode 1 c is in contact with the inner peripheral surface of the housing 3. In the solid battery 10, the shaft center member 2 is made of polypropylene resin. When the solid battery 10 is manufactured, the shaft center member 2 is housed in the housing 3 while being kept at a temperature of 0 ° C. or lower, and the housing 3 is sealed. After being stopped, the shaft center member 2 is heated to a temperature equal to or higher than room temperature.

  FIG. 2 is a flowchart illustrating a method for manufacturing a solid state battery according to the present invention. As shown in FIG. 2, the method for producing a solid battery of the present invention includes a cooling step (S1), a structure manufacturing step (S2), a housing step (S3), and a heating step (S4). is doing. Hereinafter, a method for manufacturing the solid battery 10 will be described with reference to FIGS. 1 and 2.

  In the cooling step (hereinafter referred to as “step S1”), the temperature of the shaft member 2 containing a material having a high coefficient of thermal expansion is lower than room temperature (for example, a temperature of 0 ° C. or lower, etc.). )). As long as the shaft center member 2 can be cooled to a temperature lower than room temperature, the form of the step S1 is not particularly limited. For example, in a low temperature environment such as 0 ° C. or lower (for example, a cold district or a freezer). It is possible to store the shaft member 2 or to cool the shaft member 2 using a Peltier element.

In the present invention, the shaft member 2 is a cylindrical electrode made of a material having a linear expansion coefficient of 10 × 10 ⁻⁶ / ° C. or higher, preferably 45 × 10 ⁻⁶ / ° C. or higher (a material having a high thermal expansion coefficient). The form is not particularly limited as long as it is included in a form capable of applying a fastening pressure from the inside to the outside of the body 1. The shaft member 2 may be made of only a material having a high coefficient of thermal expansion, and only a part of the shaft member 2 may contain a material having a large coefficient of thermal expansion. Further, the shaft center member 2 may be hollow. Examples of the material that can constitute the shaft member 2 include rubbers such as nitrile rubber, styrene butadiene rubber, fluorine rubber, and silicone rubber, and plastics such as polypropylene, polyethylene, polyethylene terephthalate, and polycarbonate.

  In the structure manufacturing step (hereinafter referred to as “step S2”), a solid electrolyte layer disposed between a positive electrode, a negative electrode, and the positive electrode and the negative electrode around a shaft member maintained at a temperature lower than room temperature. Is a step of producing a structure including an axial center member and a cylindrical electrode body. The form of the step S2 is not particularly limited as long as the step S2 is a step of forming a structure by forming a cylindrical electrode body around a shaft member maintained at a temperature lower than normal temperature. Step S2 includes, for example, a process of laminating the positive electrode, the negative electrode, and the solid electrolyte layer so that the solid electrolyte layer is disposed between the positive electrode and the negative electrode. After producing the sheet-like electrode body to be provided, the structure is produced through a process of winding the sheet-like electrode body around a shaft center member maintained at a temperature lower than room temperature. Can do. In addition, the negative electrode is formed on the outer peripheral surface of the shaft member maintained at a temperature lower than normal temperature, the solid electrolyte layer is formed on the outer peripheral surface of the formed cylindrical negative electrode, and the outer periphery of the formed solid electrolyte layer It is possible to form the structure by forming a positive electrode (cylindrical positive electrode) on the surface. However, from the viewpoint of easily improving the productivity of the solid battery, the structure body is subjected to a process of winding a sheet-shaped electrode body around a shaft center member maintained at a temperature lower than normal temperature. It is preferable to adopt a form for manufacturing.

In the present invention, the positive electrode can be produced by a known method. For example, a mixture material obtained by mixing a positive electrode material and a solid electrolyte is applied to the surface of a 15 μm thick Al foil functioning as a current collector foil, and then pressed at a pressure of 98 MPa, whereby the positive electrode is applied to the surface of the Al foil. Can be produced. Examples of the positive electrode material used when producing the positive electrode include lithium transition metal oxides and chalcogenides. Examples of the lithium transition metal oxide of the positive electrode material include lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), lithium manganate (LiMnO ₂ ), iron olivine (LiFePO ₄ ), cobalt olivine (LiCoPO ₄ ), manganese Examples include olivine (LiMnPO ₄ ) and lithium titanate (Li ₄ Ti ₅ O ₁₂ ). Further, examples of the chalcogenide include copper subrel (Cu ₂ Mo ₆ S ₈ ), iron sulfide (FeS), cobalt sulfide (CoS), nickel sulfide (NiS), and the like. Further, the solid electrolyte used during the cathode _{produced, Li 2 S: P 2 S} 5 = 50: 50~100: 0 Solid made by mixing Li ₂ S and _P 2 _{S 5} (mass ratio) An electrolyte (hereinafter referred to as “Li ₂ S—P ₂ S ₅ ”) and the like can be exemplified. Thus, the thickness of the positive electrode produced can be 30 micrometers, for example.

In the present invention, the negative electrode can be produced by a known method. For example, a mixture material obtained by mixing a negative electrode material and a solid electrolyte is applied to the surface of a stainless steel (SUS) foil having a thickness of 15 μm that functions as a current collector foil, and then pressed at a pressure of 392 MPa to obtain stainless steel ( A negative electrode can be prepared on the surface of the (SUS) foil. Examples of the negative electrode material used when preparing the negative electrode include carbon, lithium transition metal oxides, and alloys. Examples of the lithium transition metal oxide of the negative electrode material include lithium titanate (Li ₄ Ti ₅ O ₁₂ ). As the alloy of the negative electrode _material, it can be exemplified La 3 _Ni 2 Sn _7. As the solid electrolyte used during anode _{manufacturing,} it can be exemplified Li 2 _S-P 2 _{S 5} or the like. Thus, the thickness of the negative electrode produced can be 40 micrometers, for example.

In the present invention, the solid electrolyte layer can be produced by a known method. For example, a solid electrolyte layer can be produced on the surface of the negative electrode by applying Li ₂ S—P ₂ S ₅ to the surface of the negative electrode produced as described above and pressing it at a pressure of 98 MPa. The thickness of the solid electrolyte layer can be set to 50 μm, for example. When the solid electrolyte layer is produced in this way, in step S2, for example, the produced sheet-like positive electrode is disposed on the surface of the solid electrolyte layer formed on the surface of the sheet-like negative electrode. A shaped electrode body can be produced. When the sheet-like electrode body is produced in this manner, for example, after the axial member 2 maintained at a temperature lower than normal temperature is disposed on the upper surface of the negative electrode of the produced sheet-like electrode body, the axial member 2 is By winding a sheet-like electrode body at the center, a structure including the axial member 2 and the cylindrical electrode body 1 disposed around the shaft member 2 can be produced. Step S2 is a step of manufacturing the structure while keeping the temperature of the shaft member 2 at a temperature lower than room temperature. Therefore, for example, the structure is produced in a cold region, or the structure is produced in a room at a low temperature of about 0 ° C. or less, while the shaft member 2 is cooled using a Peltier element. It is also possible to form the structure body. In the method for producing a solid state battery of the present invention, it is preferable to perform step S2 in a dry atmosphere from the viewpoint of preventing condensation on the inside of the housing 3.

  In the housing step (hereinafter referred to as “step S3”), the structure produced in step S2 is housed in the housing 3 while maintaining the temperature of the shaft member 2 at a temperature lower than room temperature. It is a process of restraining the periphery of the body. In step S3, for example, the structure manufactured in step S2 is accommodated in the housing 3 while maintaining the temperature of the shaft center member 2 at a temperature lower than the normal temperature, and then the positive electrode is formed from the inner peripheral surface of the housing 3. By sealing the housing | casing 3 with the form which can provide a fastening pressure to the outer peripheral surface of 1c, it can be set as the process of restraining the circumference | surroundings of the structure produced by said process S2. The casing 3 can be sealed by a known method such as in a reduced pressure environment. The casing 3 is a known material that can be used as a casing of a solid battery (for example, a known resin on the positive electrode 1c side). Etc., and an outer peripheral surface is constituted by a metal layer or the like, and a material obtained by laminating these layers by lamination or the like.

  The heating step (hereinafter referred to as “step S4”) is a step of heating the shaft member 2 to a temperature equal to or higher than room temperature after the step S3. Step S4 is, for example, a mode in which the shaft member 2 is heated to room temperature by moving the sealed housing 3 to a room temperature environment, or a case 3 sealed using any heating means. The shaft center member 2 can be heated to a temperature equal to or higher than normal temperature by heating. In addition, when the shaft center member 2 is cooled using a Peltier element, the shaft center member 2 can be heated to a temperature equal to or higher than normal temperature by heating using the Peltier element.

  In the solid battery 10 manufactured through the above steps S1 to S4, the axial member 2 containing a material having a high coefficient of thermal expansion is disposed inside the cylindrical electrode body 1, and the periphery of the electrode body 1 is Restrained by the housing 3. Then, after the shaft center member 2 and the cylindrical electrode body 1 are accommodated in the housing 3, the shaft center member 2 kept at a temperature lower than the normal temperature is heated to a temperature equal to or higher than the normal temperature. Since the axial member 2 can be expanded by heating the axial member 2, a fastening pressure can be applied from the inner side to the outer side of the electrode body 1 by the expanded axial member 2. . Since the internal resistance can be reduced by applying the fastening pressure, according to the present invention, it is possible to provide the solid state battery 10 capable of reducing the internal resistance and the manufacturing method thereof. Further, when the solid battery 10 manufactured in this way is used, the temperature of the shaft center member 2 further increases. Therefore, according to the present invention, it is possible to provide a solid battery 10 and a method for manufacturing the same that can increase the fastening pressure applied from the inside to the outside of the electrode body 1 during use as compared to before use.

  In addition, according to the present invention in which the fastening pressure is applied from the inner side to the outer side of the electrode body 1, it is possible to compensate for a decrease in the restraining load accompanying continuous use of the battery as needed. Since re-restraining from the inside is easier than re-restraining from the outside of the electrode body, according to the present invention, the solid battery 10 that can easily compensate for the decrease in the restraining load accompanying continuous use and its A manufacturing method can be provided. For example, when the solid battery 10 according to the present invention is used in an electric vehicle or a hybrid vehicle, the battery-equipped vehicle is stopped at a charging stand, and then the shaft member is heated or heated to a predetermined temperature or higher. After charging with the temperature of the shaft member maintained, the temperature of the shaft member may be returned to room temperature. By setting it as this form, it becomes possible to supplement the fall of the restraint load accompanying continuous use of a battery from the inner side of an electrode body.

  In the above description regarding the present invention, the mode in which only one electrode body 1 is disposed around the shaft center member 2 is illustrated, but the present invention is not limited to this mode, and the periphery of the shaft center member A plurality of electrode bodies may be wound concentrically. In the above description of the present invention, an example in which the electrode body 1, the shaft center member 2, and the housing 3 having a circular cross section with the axial direction as the normal direction is provided is illustrated. However, the cross-sectional shape is not limited to, and may be a polygonal shape such as a triangle, a quadrangle, or a hexagon, for example, and may be an elliptical shape. In the above description of the present invention, the negative electrode 1a is disposed on the inner peripheral surface side of the solid electrolyte layer 1b, and the positive electrode 1c is disposed on the outer peripheral surface side of the solid electrolyte layer 1b. However, the present invention is not limited to this form, and a form in which the positive electrode is disposed on the inner peripheral surface side of the solid electrolyte layer and the negative electrode is disposed on the outer peripheral surface side of the solid electrolyte layer is also possible.

  Moreover, in the said description regarding this invention, although the structure manufacturing process was illustrated after the cooling process, the manufacturing method of the solid battery of this invention is not limited to the said form. In the solid battery manufacturing method of the present invention, for example, after the shaft center member is disposed so as to contact the sheet-like electrode body, the shaft center member is cooled to a temperature lower than room temperature, It is also possible to adopt a configuration in which the structure manufactured while being maintained at a temperature lower than normal temperature is accommodated in a housing, and then the shaft center member is heated to a temperature equal to or higher than normal temperature.

  The solid battery of the present invention can be used for electric vehicles, hybrid vehicles, and the like, and the solid battery manufacturing method of the present invention can be used for manufacturing solid batteries used for electric vehicles, hybrid vehicles, and the like.

DESCRIPTION OF SYMBOLS 1 ... Electrode body 1a ... Negative electrode 1b ... Solid electrolyte layer 1c ... Positive electrode 2 ... Axial member 3 ... Case 10 ... Solid battery

Claims (4)

An axial member, a cylindrical electrode body disposed around the axial member, and a housing that houses the axial member and the electrode body,
The electrode body includes a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode,
A solid battery, wherein the constituent material of the shaft member includes a material having a higher coefficient of thermal expansion than the casing. The tube is subjected to a process of winding a sheet-like electrode body having the positive electrode, the negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode around the shaft member. The solid battery according to claim 1, wherein a solid electrode body is formed. By forming a cylindrical electrode body having a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode around the shaft member maintained at a temperature lower than normal temperature, A structure manufacturing step of manufacturing a structure including an axial center member and the cylindrical electrode body;
While holding the shaft member at a temperature lower than room temperature, the structure produced in the structure production step is accommodated in a housing, and the accommodation step of restraining the periphery of the structure;
A heating step of setting the temperature of the shaft member to a temperature equal to or higher than room temperature after the housing step;
A method for manufacturing a solid state battery, wherein the constituent material of the shaft member includes a material having a higher coefficient of thermal expansion than the casing. The positive electrode, the negative electrode, and the solid electrolyte layer are laminated so that the solid-state electrolyte layer is disposed between the positive electrode and the negative electrode, and the positive electrode, After producing the negative electrode and the sheet-like electrode body comprising the solid electrolyte layer, the produced sheet-like electrode body is wound around an axis member maintained at a temperature lower than room temperature. The method for producing a solid state battery according to claim 3, wherein the structure is a step of producing the structure through a process of performing the step.

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