JP6430760B2 - All solid state battery and manufacturing method thereof - Google Patents

Description

  The present invention relates to an all-solid battery and a method for manufacturing the same.

  Conventionally, for example, a lithium secondary battery is known as a high-performance battery. In a lithium secondary battery, an organic electrolyte in which a lithium salt is dissolved in a flammable organic solvent is used as an electrolyte. However, a battery using a liquid organic electrolyte is not sufficient in terms of safety such as leakage of the organic electrolyte. Therefore, in recent years, in order to ensure higher safety, all-solid-state batteries using solid electrolytes have been developed instead of liquid electrolytes.

  For example, Patent Document 1 discloses an all solid state battery in which a through hole is formed in a battery cell (positive electrode, negative electrode, electrolyte) and a battery cell is pressurized by fastening a bolt that is a shaft member inserted into the through hole. Has been. Patent Document 2 discloses an all-solid-state battery that includes a battery cell and a housing that houses the battery cell, and that is filled with gas for pressurizing the battery cell. Such an all-solid-state battery pressurizes the battery cell by the above-described method, thereby reducing the electric resistance inside the battery cell and improving the battery performance.

Japanese Patent No. 4770489 Japanese Patent No. 5257471

  However, the all-solid-state battery of Patent Document 1 has a complicated structure, a large number of parts, and a large mass, such as a shaft member (bolt) inserted into a through hole formed in a battery cell and fastened. Therefore, the mass energy density is reduced. Moreover, since the through-hole is formed in the battery cell, the volume of the battery cell is reduced and the volume energy density is lowered.

  In addition, the all-solid-state battery of Patent Document 2 has a complicated structure and a large number of parts, such as a case for filling a gas for pressurizing a battery cell in a housing and a space for arranging the case. And the volume increases. Therefore, the mass energy density and the volume energy density are reduced.

  The present invention has been made in view of such a background, and with a simple configuration, the electrical resistance inside the battery cell can be reduced, the mass energy density and the volume energy density can be increased, and the battery performance can be improved. An object of the present invention is to provide a solid state battery and a manufacturing method thereof.

  One aspect of the present invention is a battery cell in which the positive electrode, the negative electrode, and the electrolyte are solid, a cylindrical portion that houses the battery cell, and a blocking portion that closes at least a part of one end in the axial direction of the cylindrical portion. And a lid that seals the other end in the axial direction of the cylindrical portion in the exterior and that contacts the battery cell.

  In the all-solid-state battery, the exterior includes a cylindrical part that houses a battery cell in which the positive electrode, the negative electrode, and the electrolyte are solid, and a closed part that closes at least a part of one end of the cylindrical part. The lid that seals the other end of the cylindrical portion seals the other end of the cylindrical portion so as to apply pressure to the battery cell in the axial direction of the cylindrical portion, and contacts the battery cell. doing.

  Therefore, pressure is applied directly or indirectly from the lid to the closed portion of the exterior via the battery cell, and the repulsive force acts directly or indirectly on the battery cell. Thereby, the battery cell accommodated in the cylindrical part will be in the state pressurized by the axial direction of the cylindrical part by the obstruction | occlusion part in the one end of a cylindrical part, and the cover body in the other end. Therefore, the electrical resistance inside the battery cell can be reduced and the battery performance can be improved.

  Further, as described above, the all solid state battery has a simple configuration including a battery cell, an exterior, and a lid. Therefore, the number of parts can be reduced, and the mass and volume of the whole all solid state battery can be reduced. Thereby, the mass energy density and volume energy density of an all-solid-state battery can be raised, and the improvement of battery performance can be aimed at effectively.

  Another aspect of the present invention is a battery cell in which the positive electrode, the negative electrode, and the electrolyte are solid, a cylindrical part that houses the battery cell, and a blocking part that closes at least a part of one end in the axial direction of the cylindrical part. And a lid that seals the other axial end of the cylindrical portion in the exterior and that contacts the battery cell. A housing step of housing the battery cell in the shape portion, and the lid body is brought into contact with the battery cell while being pressed in the axial direction of the cylindrical portion, and the exterior body is contacted from the lid body via the battery cell. And a sealing step of sealing the other end of the cylindrical portion of the exterior with the lid in a state in which pressure is applied to the closing portion. .

  The manufacturing method of the said all-solid-state battery performs an accommodating process and a sealing process in order. That is, in the housing step, the battery cell is housed in the outer cylindrical portion. In the sealing step, the other end of the outer cylindrical portion is sealed with a lid. At this time, the lid is brought into contact with the battery cell while being pressed in the axial direction of the cylindrical portion, and pressure is applied from the lid to the closed portion of the exterior via the battery cell. Therefore, the battery cell accommodated in the cylindrical portion is in a state of being pressurized in the axial direction of the cylindrical portion by the closing portion at one end of the cylindrical portion and the lid body at the other end.

  As a result, the all-solid battery described above, that is, an all-solid battery that can reduce the electrical resistance inside the battery cell, increase the mass energy density and the volume energy density, and improve the battery performance with a simple configuration can be easily obtained. Can be manufactured. In addition, since the all solid state battery has a simple configuration and the number of parts is small, it is possible to facilitate work in manufacturing the all solid state battery, simplify the process, and the like.

  As described above, according to the present invention, an all-solid-state battery that can reduce the electrical resistance inside the battery cell, increase the mass energy density and the volume energy density, and improve the battery performance with a simple configuration, and the manufacture thereof. A method can be provided.

  In the all solid state battery, the battery cell includes a positive electrode, a negative electrode, and an electrolyte made of a solid. Specifically, the battery cell includes, for example, a positive electrode (positive electrode layer) containing a positive electrode material, a negative electrode (negative electrode layer) containing a negative electrode material, and an electrolyte (solid electrolyte) disposed between the positive electrode and the negative electrode. And can be configured.

  Moreover, the said exterior has a cylindrical part which accommodates a battery cell, and the obstruction | occlusion part which obstruct | occludes at least one part among the axial ends of the cylindrical part. The cylindrical portion and the closing portion may be configured to be joined together as separate members, but are preferably configured integrally with one member. In this case, since there is no joining portion, it is possible to reduce the risk of damage to the exterior due to the pressure applied to the blocking portion.

  Further, the battery cell further includes a pair of current collectors electrically connected to the battery cell, and the one end of the tubular portion of the exterior is formed with an opening that is not closed by the closing portion, Between the battery cell and the closed portion of the exterior, one of the current collectors is disposed with a part protruding from the opening, and the lid constitutes the other current collector. You may do it.

  In this case, pressure is applied from the lid to the closed portion of the exterior via the battery cell and one current collector, and the repulsive force acts on the battery cell. Thereby, a battery cell will be in the state pressurized and the electrical resistance inside a battery cell can be reduced. On the other hand, electricity can be easily taken out from one current collector projecting from the opening at one end of the cylindrical portion of the exterior and the other current collector serving also as a lid. Moreover, since the cover body constitutes the other current collector, the entire all-solid-state battery can be made simpler and the number of parts can be reduced. Thereby, a mass energy density and a volume energy density can be raised.

  An elastic body may be disposed between the closed portion of the exterior and the one current collector. In this case, the elastic body is pressed from one current collector, so that the elastic force of the elastic body acts on the battery cell via the one current collector. Thereby, a battery cell can be pressurized more and the electrical resistance inside a battery cell can further be reduced.

  Moreover, the outer diameter of the said cover body may be larger than the internal diameter of the said other end of the said cylindrical part of the said exterior. In this case, the other end of the cylindrical portion can be sealed with the lid while the lid is press-fitted into the other end of the outer cylindrical portion. Thereby, the state by which the battery cell was pressurized can fully be maintained.

  Moreover, the said cover body may be joined to the said cylindrical part of the said exterior. In this case, when the lid is pressed against the battery cell while being in contact with the battery cell, that is, in a state where the battery cell is pressurized, the lid is joined to the tubular portion of the exterior, whereby the battery cell Can be sufficiently maintained in a pressurized state.

  In addition, the battery pack further includes a pair of current collectors electrically connected to the battery cells, the exterior constitutes one current collector, and the lid constitutes the other current collector. May be. In this case, the exterior and the lid constitute a pair of current collectors, so that the whole all solid state battery can have a simpler configuration and the number of parts can be reduced. Thereby, a mass energy density and a volume energy density can be raised.

  In the all-solid-state battery manufacturing method, in the sealing step, the lid may be joined to the cylindrical portion of the exterior. In this case, the lid is brought into contact with the battery cell while being pressed, and in a state where pressure is applied from the lid to the closed portion of the exterior via the battery cell, that is, in a state where the battery cell is pressurized, The lid is joined to the cylindrical portion of the exterior. Thereby, the other end of the cylindrical part of an exterior can be sealed with a lid, maintaining the state where the battery cell was pressurized.

2 is a cross-sectional view showing the structure of an all-solid battery in Embodiment 1. FIG. FIG. 3 is an explanatory diagram showing a housing process of the method for manufacturing an all solid state battery in Embodiment 1. FIG. 3 is an explanatory diagram showing a housing process of the method for manufacturing an all solid state battery in Embodiment 1. FIG. 3 is an explanatory diagram showing a sealing process of the method for manufacturing an all-solid battery in Embodiment 1. FIG. 3 is a cross-sectional view showing the structure of an all-solid battery in Embodiment 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the all solid state battery of this embodiment will be described.

  As shown in FIG. 1, the all solid state battery 1 of the present embodiment includes a battery cell 2 in which a positive electrode layer (positive electrode) 21, a negative electrode layer (negative electrode) 22, and a solid electrolyte layer (electrolyte) 23 are solid, and a battery cell 2. And the other end of the cylindrical portion 311 in the axial direction of the outer casing 31 is sealed. A lid 32 that stops and contacts the battery cell 2. This will be described in detail below.

  As shown in FIG. 1, the all solid state battery 1 includes a battery cell 2. The battery cell 2 includes a positive electrode layer 21 that functions as a positive electrode, a negative electrode layer 22 that functions as a negative electrode, and a solid electrolyte layer 23 disposed between the positive electrode layer 21 and the negative electrode layer 22. The battery cell 2 is configured by laminating a positive electrode layer 21, a solid electrolyte layer 23, and a negative electrode layer 22 in this order. That is, the positive electrode layer 21 and the negative electrode layer 22 are disposed so as to sandwich both surfaces of the solid electrolyte layer 23.

  The positive electrode layer 21 contains a positive electrode material as an electrode active material (positive electrode active material), a conductive solid electrolyte, an electron conductive material such as a carbon material, and the like. The negative electrode layer 22 contains a negative electrode material as an electrode active material (negative electrode active material), a conductive solid electrolyte, an electron conductive material such as a carbon material, and the like. In the positive electrode layer 21 and the negative electrode layer 22, the electron conductive material can be omitted. Moreover, the positive electrode layer 21 and the negative electrode layer 22 may contain binder components, such as a silicon compound.

  The solid electrolyte layer 23 is made of a lithium ion conductive solid electrolyte material, and is composed of an oxide solid electrolyte material or a sulfide solid electrolyte material. In addition, at least one of the positive electrode layer 21 and the negative electrode layer 22 contains a sulfide-based solid electrolyte material. Thereby, each layer can be joined, without performing the heat processing for joining the positive electrode layer 21, the solid electrolyte layer 23, and the negative electrode layer 22 in the all-solid-state battery 1, and the solid electrolyte layer 23 is an oxide type solid electrolyte material. In this case, the sulfide content of the all-solid battery 1 can be reduced.

The oxide solid electrolyte material constituting the solid electrolyte layer 23 may be any solid electrolyte material containing an oxide as a compound, but the oxide lithium ion conductive solid electrolyte in which lithium ions in the electrolyte are responsible for electrical conduction. It is preferable to use a material. As the oxide-based lithium ion conductive solid electrolyte material, Li _{1 + x} Al _x M _2-x (PO ₄ ) ₃ [wherein M is at least one selected from the group consisting of germanium, titanium, hafnium, and zirconium. X is 0 <x <1. Or a substituted product obtained by substituting a part of the phosphoric acid compound having a NASICON type structure represented by any other element, Li ₇ La ₃ Zr ₂ O ₁₂ , Li-La having a garnet type structure or a garnet type similar structure A —Ti—O-based lithium ion conductor, a Li—La—Ti—O-based lithium ion conductor having a perovskite structure or a perovskite-like structure can be used.

The sulfide-based solid electrolyte material constituting the solid electrolyte layer 23 may be a solid electrolyte material containing sulfide as a compound, but the sulfide-based lithium ion conductive solid electrolyte in which lithium ions in the electrolyte are responsible for electrical conduction. It is preferable to use a material. Examples of sulfide-based lithium ion conductive solid electrolyte materials include Li ₂ S—P ₂ S ₅ system, LiI—Li ₂ S—P ₂ O ₅ system, LiI—Li ₂ S—B ₂ S ₃ system, and LiI. -Li ₂ S-SiS ₂ system, thiolysicon, or the like can be used.

At least one of the positive electrode layer 21 and the negative electrode layer 22 is made of a sulfide-based solid electrolyte material. The sulfide-based solid electrolyte material may be a solid electrolyte material containing sulfide as a compound, but it is preferable to use a sulfide-based lithium ion conductive solid electrolyte material in which lithium ions in the electrolyte are responsible for electrical conduction. Examples of sulfide-based lithium ion conductive solid electrolyte materials include Li ₂ S—P ₂ S ₅ system, LiI—Li ₂ S—P ₂ O ₅ system, LiI—Li ₂ S—B ₂ S ₃ system, and LiI. -Li ₂ S-SiS ₂ system, thiolysicon, or the like can be used.

  Of the positive electrode layer 21 and the negative electrode layer 22, any one of the solid electrolytes may be made of a sulfide-based solid electrolyte material, and if the other contains a material constituting the counter electrode, the sulfide-based solid electrolyte is used. It does not have to contain any material. For example, a metal plate, a sintered body of metal powder, a deposit deposited by vapor deposition of metal, or the like may be used as the counter electrode. Specifically, for example, when the solid electrolyte of the positive electrode layer 21 is a sulfide lithium ion conductive solid electrolyte material, the negative electrode layer 22 is a sintered body obtained by sintering lithium metal, an alloy thereof, or an electrode active material. In addition, a deposit or the like obtained by evaporating and depositing an electrode active material can be used.

  The electrode active material of the positive electrode layer 21 and the negative electrode layer 22 may be any material that delivers electrons. For example, a substance that can occlude, release, or both occlude and release lithium ions can be used. Specifically, for example, a metal oxide such as a Li-containing metal oxide can be used. In detail, for example, lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, lithium titanate, cobalt oxide, manganese oxide, nickel oxide, titanium oxide, lithium oxide and some of these compounds are others. A compound substituted with the above element can be used. Moreover, as an electrode active material, lithium metal and a lithium alloy can be used, for example. As the lithium alloy, for example, Li—Al, Li—Sn, Li—Si, Li—Ag, or the like can be used. Furthermore, sulfides such as sulfur and metal sulfides can be used as the electrode active material. As the sulfide, for example, copper sulfide, iron sulfide, titanium sulfide, nickel sulfide and the like can be used.

In the present embodiment, Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ (hereinafter referred to as “LAGP”) was used as the oxide-based solid electrolyte material constituting the solid electrolyte layer 23. Further, LiCoO ₂ was used as a positive electrode material constituting the positive electrode layer 21. Further, Li ₄ Ti ₅ O ₁₂ was used as a negative electrode material constituting the negative electrode layer 22. Further, sulfide glass was used as a sulfide-based lithium ion conductive solid electrolyte material as a solid electrolyte constituting the positive electrode layer 21 and the negative electrode layer 22, and vapor growth carbon fiber was used as an electron conductive material.

  As shown in the figure, the all-solid-state battery 1 includes a SUS (stainless steel) housing 3 that houses battery cells 2. The housing 3 includes an exterior 31 and a lid 32. The exterior 31 has one end and the other end along the axis, and has a cylindrical tubular portion 311 that houses the battery cell 2 therein, and a closed portion 312 that closes at least a part of one end of the tubular portion 311. And have. An opening 313 communicating with the interior of the exterior 31 is formed at the center of the closing part 312. A lid 32 is disposed at the other end of the cylindrical portion 311. The lid 32 constitutes a second current collector 52 described later.

  As shown in the figure, the all-solid-state battery 1 includes a pair of current collectors (a first current collector 51 and a second current collector 52) that are electrically connected to the battery cells 2. The first current collector 51 is disposed between the battery cell 2 and the closed portion 312 of the exterior 31. The first current collector 51 is disposed so that a part thereof protrudes from the opening 313 of the exterior 31. The first current collector 51 is made of a SUS (stainless steel) base material. The second current collector 52 is the lid body 32 of the housing 3. That is, the lid body 32 constitutes a second current collector 52.

  The first current collector 51 and the second current collector 52 are arranged so as to sandwich the battery cell 2 therebetween. And the 1st electrical power collector 51 is arrange | positioned at the positive electrode layer 21 side of the battery cell 2, and the 2nd electrical power collector 52 is arrange | positioned at the negative electrode layer 22 side. The first current collector 51 is electrically connected to the positive electrode layer 21 of the battery cell 2. The second current collector 52 is electrically connected to the negative electrode layer 22 of the battery cell 2.

  An annular elastic body 4 is disposed between the first current collector 51 and the closing portion 312 of the exterior 31. As the elastic body 4, various elastic bodies made of rubber, resin, etc., various spring materials such as metal leaf springs, and the like can be used. In addition, an insulating film 33 is disposed between the exterior 31 (the cylindrical portion 311 and the closing portion 312), the battery cell 2, and the first current collector 51. Thereby, the insulation between the 1st electrical power collector 51 and the 2nd electrical power collector 52 (lid body 32) is ensured. The insulating film 33 can be appropriately changed as long as the insulation between the first current collector 51 and the second current collector 52 (lid 32) can be secured. For example, a heat-resistant insulating film (Kapton film or the like), insulating coating, resin tape, or the like may be used.

  Further, the outer diameter of the lid body 32 is set to be larger than the inner diameter of the other end of the cylindrical portion 311 of the exterior 31. The lid body 32 is press-fitted into the other end of the cylindrical portion 311. Here, the lid body 32 is press-fitted into the other end of the cylindrical portion 311 while being in contact with the battery cell 2 (negative electrode layer 22) while being pressed in the axial direction of the cylindrical portion 311. The lid body 32 is joined to the cylindrical portion 311 by laser welding. In addition, welding, brazing, etc. can be employ | adopted as a joining method.

  In the present embodiment, a load (pressure) of about 6 kN is applied to the battery cell 2 by press-fitting the lid 32 into the other end of the cylindrical portion 311 of the exterior 31. And the pressure which the cover body 32 applies with respect to the battery cell 2 can be 1-10 kN, for example.

Next, the manufacturing method of the all-solid-state battery 1 of this embodiment is demonstrated.
As shown in FIGS. 2 to 4, the method for manufacturing the all-solid-state battery 1 of the present embodiment includes a housing step of housing the battery cell 2 in the cylindrical portion 311 of the exterior 31, and a lid 32 in the battery cell 2. The other end of the cylindrical portion 311 of the outer casing 31 is brought into contact with the cylindrical portion 311 while being pressed in the axial direction, and pressure is applied from the lid body 32 to the closing portion 312 of the outer casing 31 via the battery cell 2. And a sealing step of sealing with a lid 32. This will be described in detail below.

  First, as shown in FIGS. 2 and 3, the elastic member, the first current collector 51, and the battery cell 2 (the positive electrode layer 21, the solid electrolyte layer 23, and the negative electrode layer 22) are sequentially disposed in the exterior 31. Specifically, as shown in FIG. 2, the elastic body 4 and the first current collector 51 are sequentially arranged on the closing portion 312 of the exterior 31 (the opening portion 313 is provided in a part of the closing portion 312). Deploy. At this time, a part of the first current collector 51 is projected from the opening 313 of the closing part 312 of the exterior 31. Thereafter, as shown in FIG. 3, the battery cell 2 is disposed on the first current collector 51. Thereby, the battery cell 2 is accommodated in the cylindrical portion 311 of the exterior 31.

  Next, as shown in FIG. 4, the lid body 32 is press-fitted into the other end of the cylindrical portion 311 of the exterior 31, and the lid body 32 is inserted in the axial direction of the cylindrical portion 311 with respect to the battery cell 2 (negative electrode layer 22). Touch while pressing. At this time, the closed portion 312 of the exterior 31 is disposed on the jig 61, and pressure is applied to the lid body 32 by the jig 62 disposed on the lid body 32 to apply a pressure of about 6 kN to the battery cell 2. . And the contact part P of the cover body 32 and the cylindrical part 311 is joined by laser welding in the circumferential direction.

  Accordingly, the lid 32 is brought into contact with the battery cell 2 while being pressed in the axial direction of the cylindrical portion 311, and pressure is applied from the lid 32 to the closing portion 312 of the exterior 31 via the battery cell 2. The other end of the cylindrical portion 311 of the exterior 31 is sealed with the lid body 32. Thus, the all solid state battery 1 shown in FIG. 1 is obtained.

In addition, the inside of the all-solid-state battery 1 is filled with the inert gas (for example, argon gas, nitrogen gas, etc.) in the chamber (space) by inert gas (for example, argon gas, nitrogen gas) atmosphere. You may do it. In this way, for example, hydrolysis and oxidation of sulfide solid electrolyte material, reaction of lithium metal negative electrode (negative electrode layer 22) with moisture, nitrogen, oxygen, carbon dioxide, etc., lithium alloy negative electrode (negative electrode layer) 22) Deterioration of each material due to the reaction with moisture and the reaction with the moisture of the electrode material (LiCoO ₂ or the like) can be reduced.

Next, the effect of this embodiment is demonstrated.
In the all solid state battery 1 of the present embodiment, the exterior 31 includes a cylindrical part 311 that houses the battery cell 2 having the positive electrode layer 21, the negative electrode layer 22, and the solid electrolyte layer 23 made of solid, and one end of the cylindrical part 311. Of these, a closed portion 312 that closes at least a portion is included. The lid 32 that seals the other end of the cylindrical portion 311 seals the other end of the cylindrical portion 311 so as to apply pressure to the battery cell 2 in the axial direction of the cylindrical portion 311. In contact with the battery cell 2.

  Therefore, pressure is indirectly applied to the closing portion 312 of the exterior 31 from the lid 32 via the battery cell 2, and the repulsive force is indirectly applied to the battery cell 2. Thereby, the battery cell 2 accommodated in the cylindrical part 311 was pressurized in the axial direction of the cylindrical part 311 by the closing part 312 at one end of the cylindrical part 311 and the lid body 32 at the other end. It becomes a state. Therefore, the electrical resistance inside the battery cell 2 can be reduced and the battery performance can be improved.

  Moreover, the all-solid-state battery 1 is the simple structure of the battery cell 2, the exterior 31, and the cover body 32 as above-mentioned. Therefore, the number of parts can be reduced, and the mass and volume of the entire all-solid battery 1 can be reduced. Thereby, the mass energy density and the volume energy density of the all-solid-state battery 1 can be raised, and the improvement of battery performance can be aimed at effectively.

  In the present embodiment, the all-solid-state battery 1 further includes a pair of current collectors (a first current collector 51 and a second current collector 52) that are electrically connected to the battery cells 2. Further, an opening 313 is formed at one end of the cylindrical portion 311 of the exterior 31 so as to open without being closed by the closing portion 312. In addition, between the battery cell 2 and the closed portion 312 of the exterior 31, one current collector (first current collector 51) is arranged with a part protruding from the opening 313, and the lid 32 is The other current collector (second current collector 52) is configured.

  Therefore, pressure is applied from the lid 32 to the closing portion 312 of the exterior 31 via the battery cell 2 and the first current collector 51, and the repulsive force acts on the battery cell 2. Thereby, the battery cell 2 will be in the pressurized state, and the electrical resistance inside the battery cell 2 can be reduced. On the other hand, electricity can be easily taken out from the first current collector 51 protruding from the opening 313 at one end of the cylindrical portion 311 of the exterior 31 and the second current collector 52 that also serves as the lid 32. Moreover, since the cover body 32 constitutes the second current collector 52, the entire all-solid-state battery 1 can have a simpler configuration, and the number of parts can be reduced. Thereby, a mass energy density and a volume energy density can be raised.

  The elastic body 4 is disposed between the closed portion 312 of the exterior 31 and one of the current collectors (first current collector 51). Therefore, when the elastic body 4 is pressed from the first current collector 51, the elastic force of the elastic body 4 acts on the battery cell 2 via the first current collector 51. Thereby, the battery cell 2 can be pressurized more and the electrical resistance inside the battery cell 2 can further be reduced.

  Further, the outer diameter of the lid 32 is larger than the inner diameter of the other end of the cylindrical portion 311 of the exterior 31. Therefore, the other end of the cylindrical portion 311 can be sealed with the lid 32 while the lid 32 is press-fitted into the other end of the cylindrical portion 311 of the exterior 31. Thereby, the state by which the battery cell 2 was pressurized can fully be maintained.

  The lid 32 is joined to the cylindrical portion 311 of the exterior 31. Therefore, the lid body 32 is joined to the cylindrical portion 311 of the exterior 31 in a state where the lid body 32 is pressed against the battery cell 2, that is, in a state where the battery cell 2 is pressurized. The battery cell 2 can be sufficiently maintained in a pressurized state.

  Moreover, the manufacturing method of the all-solid-state battery 1 of this embodiment performs an accommodation process and a sealing process in order. That is, in the housing process, the battery cell 2 is housed in the cylindrical portion 311 of the exterior 31. In the sealing step, the other end of the cylindrical portion 311 of the exterior 31 is sealed with the lid 32. At this time, the lid 32 is brought into contact with the battery cell 2 while being pressed in the axial direction of the cylindrical portion 311, and pressure is applied from the lid 32 to the closing portion 312 of the exterior 31 via the battery cell 2. To do. Therefore, the battery cell 2 accommodated in the cylindrical portion 311 is pressed in the axial direction of the cylindrical portion 311 by the closing portion 312 at one end of the cylindrical portion 311 and the lid body 32 at the other end. It becomes.

  Thereby, the all-solid-state battery 1 mentioned above can be manufactured easily. In addition, since the all solid state battery 1 has a simple configuration and a small number of parts, it is possible to facilitate work in manufacturing the all solid state battery 1 and simplify processes.

  In the present embodiment, the lid 32 is joined to the cylindrical portion 311 of the exterior 31 in the sealing step. Therefore, the lid 32 is brought into contact with the battery cell 2 while being pressed, and the battery cell 2 is pressurized in a state where pressure is applied from the lid 32 to the closing portion 312 of the exterior 31 via the battery cell 2. In this state, the lid body 32 is joined to the cylindrical portion 311 of the exterior 31. Thereby, the other end of the cylindrical portion 311 of the exterior 31 can be sealed with the lid 32 while maintaining the state in which the battery cell 2 is pressurized.

  Thus, according to the present embodiment, the all-solid-state battery 1 that can reduce the electrical resistance inside the battery cell 2, increase the mass energy density and the volume energy density, and improve the battery performance with a simple configuration. And a manufacturing method thereof.

(Embodiment 2)
As shown in FIG. 5, the present embodiment is an example in which the configuration of a pair of current collectors (first current collector 51 and second current collector 52) of the all solid state battery 1 is changed.

  As shown in the figure, in the housing 3, the exterior 31 (cylindrical portion 311, closing portion 312) constitutes one current collector (first current collector 51). The lid 32 constitutes the other current collector (second current collector 52). Further, the battery cell 2 (positive electrode layer 21) is disposed on the closing portion 312 of the exterior 31. As a result, the positive electrode layer 21 and the closed portion 312 are electrically connected, and the exterior 31 (the cylindrical portion 311 and the closed portion 312) plays the role of the first current collector 51. In addition, the lid body 32 seals the exterior 31 so as to come into contact with the battery cell 2 (negative electrode layer 22). Accordingly, the negative electrode layer 22 and the lid body 32 are electrically connected, and the lid body 32 serves as the second current collector 52. Note that the elastic body 4 of the first embodiment (see FIG. 1) is not disposed between the battery cell 2 and the closing portion 312 of the exterior 31. Other basic configurations are the same as those of the first embodiment.

Next, the manufacturing method of the all-solid-state battery 1 of this embodiment is demonstrated.
First, as shown in the figure, the battery cell 2 (the positive electrode layer 21, the solid electrolyte layer 23, and the negative electrode layer 22) is disposed in the exterior 31. Specifically, the battery cell 2 is disposed on the closing portion 312 of the exterior 31. Thereby, the battery cell 2 is accommodated in the cylindrical portion 311 of the exterior 31.

  Next, the lid 32 is press-fitted into the other end of the cylindrical portion 311 of the exterior 31, and the lid 32 is brought into contact with the battery cell 2 (negative electrode layer 22) while being pressed in the axial direction of the cylindrical portion 311. Thereby, the lid 32 is brought into contact with the battery cell 2 while applying pressure in the axial direction of the cylindrical portion 311, and the pressure is applied from the lid 32 to the closing portion 312 of the exterior 31 via the battery cell 2. Thus, the other end of the cylindrical portion 311 of the exterior 31 is sealed with the lid 32. As described above, the all solid state battery 1 is obtained.

Next, the effect of this embodiment is demonstrated.
In the case of this embodiment, the exterior 31 and the lid 32 constitute a pair of current collectors (first current collector 51 and second current collector 52), so that the entire solid state battery 1 as a whole can be simplified. The configuration can reduce the number of parts. Thereby, a mass energy density and a volume energy density can be raised. Other basic functions and effects are the same as those of the first embodiment.

(Other embodiments)
It goes without saying that the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the present invention.

  (1) In the above-described embodiment, as shown in FIG. 1 and the like, one battery cell 2 is arranged in the cylindrical portion 311 of the exterior 31, but for example, in the cylindrical portion 311 of the exterior 31. A plurality of battery cells 2 may be stacked and arranged.

  (2) In the above-described embodiment, as shown in FIG. 1 and the like, the cylindrical portion 311 and the closing portion 312 in the exterior 31 are integrally configured as one member. You may make it make the obstruction | occlusion part 312 into another member, and join both.

DESCRIPTION OF SYMBOLS 1 ... All-solid-state battery 2 ... Battery cell 21 ... Positive electrode layer (positive electrode)
22 ... Negative electrode layer (negative electrode)
23 ... Solid electrolyte layer (electrolyte)
31 ... Exterior 311 ... Cylindrical part 312 ... Closure part 32 ... Lid

Claims (7)

A battery cell in which the positive electrode, the negative electrode and the electrolyte are solid;
An exterior having a cylindrical portion that houses the battery cell and a closed portion that closes at least a part of one end in the axial direction of the cylindrical portion;
A lid that seals the other axial end of the tubular portion in the exterior and contacts the battery cell;
A pair of current collectors electrically connected to the battery cells;
With
An opening that opens without being closed by the closing portion is formed at the one end of the tubular portion of the exterior, and one of the current collectors is provided between the battery cell and the closed portion of the exterior. A body is disposed with a part protruding from the opening, and the lid body constitutes the other current collector;
The opening is located at a portion facing the lid,
An all-solid-state battery. A battery cell in which the positive electrode, the negative electrode and the electrolyte are solid;
An exterior having a cylindrical portion that houses the battery cell and a closed portion that closes at least a part of one end in the axial direction of the cylindrical portion;
A lid that seals the other axial end of the tubular portion in the exterior and contacts the battery cell;
A pair of current collectors electrically connected to the battery cells ;
With
An opening that opens without being closed by the closing portion is formed at the one end of the tubular portion of the exterior, and one of the current collectors is provided between the battery cell and the closed portion of the exterior. A body is disposed with a part protruding from the opening, and the lid body constitutes the other current collector ;
An elastic body is disposed between the closed portion of the exterior and the one current collector,
An all-solid-state battery. 3. The all-solid-state battery according to claim 1, wherein an outer diameter of the lid is larger than an inner diameter of the other end of the cylindrical portion of the exterior . The all-solid-state battery according to any one of claims 1 to 3, wherein the lid is joined to the cylindrical portion of the exterior .   A method of manufacturing an all-solid battery,
  The all solid state battery is
  A battery cell in which the positive electrode, the negative electrode and the electrolyte are solid;
  An exterior having a cylindrical portion that houses the battery cell and a closed portion that closes at least a part of one end in the axial direction of the cylindrical portion;
  A lid that seals the other axial end of the tubular portion in the exterior and contacts the battery cell;
  A pair of current collectors electrically connected to the battery cells;
  With
  An opening that opens without being closed by the closing portion is formed at the one end of the tubular portion of the exterior, and one of the current collectors is provided between the battery cell and the closed portion of the exterior. A body is disposed with a part protruding from the opening, and the lid body constitutes the other current collector;
  The opening is located at a portion facing the lid,
  The manufacturing method of the all solid state battery is as follows:
  An accommodating step of accommodating the battery cell in the tubular portion of the exterior after arranging a part of the one current collector protruding from the opening;
  In the state where the lid is brought into contact with the battery cell while being pressed in the axial direction of the cylindrical portion, and the pressure is applied to the closed portion of the exterior via the battery cell from the lid. Sealing step of sealing the other end of the cylindrical portion with the lid,
  A method for producing an all-solid battery, comprising:   A method of manufacturing an all-solid battery,
  The all solid state battery is
  A battery cell in which the positive electrode, the negative electrode and the electrolyte are solid;
  An exterior having a cylindrical portion that houses the battery cell and a closed portion that closes at least a part of one end in the axial direction of the cylindrical portion;
  A lid that seals the other axial end of the tubular portion in the exterior and contacts the battery cell;
  A pair of current collectors electrically connected to the battery cells;
  With
  An opening that opens without being closed by the closing portion is formed at the one end of the tubular portion of the exterior, and one of the current collectors is provided between the battery cell and the closed portion of the exterior. A body is disposed with a part protruding from the opening, and the lid body constitutes the other current collector;
  An elastic body is disposed between the closed portion of the exterior and the one current collector,
  The manufacturing method of the all solid state battery is as follows:
  An accommodating step of accommodating the battery cell in the cylindrical portion of the exterior, after sequentially arranging the elastic body and the one current collector with respect to the closing portion,
  In the state where the lid is brought into contact with the battery cell while being pressed in the axial direction of the cylindrical portion, and the pressure is applied to the closed portion of the exterior via the battery cell from the lid. Sealing step of sealing the other end of the cylindrical portion with the lid,
  A method for producing an all-solid battery, comprising:   In the sealing step, the lid is joined to the tubular portion of the exterior;
  A method for producing an all solid state battery according to claim 5 or 6, wherein: