JP2021082562A - All-solid-state battery - Google Patents

Abstract

To provide an all-solid-state battery capable of increasing battery capacity by effectively using an internal space while miniaturization is achieved.SOLUTION: An all-solid-state battery 1 includes: an exterior can 2 having a bottom 21 and a peripheral wall 22; a seal plate 3 covering the opening of the exterior can 2 and having a peripheral end 31 and a central part 32 having a thicker wall thickness than the peripheral end 31; a power generation element 4 stored between the bottom 21 of the exterior can 2 and the seal plate 3; and a gasket 5 disposed between the peripheral wall 22 of the exterior can 2 and the power generation element 4. By covering the opening of the exterior can 2 with the flat seal plate 3, the internal space of the all-solid-battery 1 can be effectively used and battery capacity can be increased. In addition, by caulking the tip of the peripheral wall 22 of the exterior can 2 toward the peripheral end 31 of the seal plate 3, the exterior can 2 and the seal plate 3 can be sufficiently caulked while miniaturization is achieved.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an all-solid-state battery.

Japanese Unexamined Patent Publication No. 2017-162771 discloses a battery in which a step portion is provided on a side wall portion of a sealing can (Patent Document 1). In the conventional battery, the outer can and the sealing plate are sufficiently crimped by bending the edge portion of the outer can toward the step portion provided on the side wall portion of the sealing can. Therefore, the conventional battery can sufficiently seal the internal space formed between the outer can and the sealing plate.

Further, Japanese Patent Application Laid-Open No. 2005-005616 discloses an electrochemical device in which the crimped portion is hard to peel off even if the closed container becomes thin (Patent Document 2). In conventional electrochemical devices, one end of a container member is placed on the other end of the container member with a gasket interposed between one end of the container member and the other end of the container member. It is crimped. Further, the end portion of one container member and the end portion of the other container member are bonded by a gasket. Therefore, in the conventional electrochemical device, the end portion of the container member is less likely to be peeled off, and the container member can be made thinner. As a result, in the conventional electrochemical device, the battery capacity can be increased by the amount of the thin container member.

Japanese Unexamined Patent Publication No. 2017-162771 Japanese Unexamined Patent Publication No. 2005-005616

However, in the conventional battery, a wasted space is formed in the internal space below the step portion provided on the side wall portion of the sealing can. Therefore, the internal space of the all-solid-state battery cannot be effectively used, and the battery capacity with respect to the size of the internal space becomes small. Therefore, the conventional battery has a problem that the volumetric efficiency of the battery becomes low.

Further, the conventional electrochemical device has a shape in which the end portion of the container member extends outward from the side surface of the electrochemical element body in order to sufficiently crimp the thinned container member. Therefore, in the conventional electrochemical device, the area of the entire battery is larger than the area of the electrochemical body in a plan view. Therefore, the conventional electrochemical device has a problem that the area efficiency of the battery becomes low.

Therefore, an object of the present disclosure is to provide an all-solid-state battery capable of increasing the battery capacity by effectively utilizing the internal space while reducing the size.

In order to solve the above problems, the present disclosure is structured as follows. That is, the all-solid-state battery according to the present disclosure may include an outer can having a bottom portion and a peripheral wall portion. The all-solid-state battery may include a sealing plate that covers the opening of the outer can and has a peripheral end and a central portion that is thicker than the peripheral end. The all-solid-state battery may include a power generation element housed between the bottom of the outer can and the sealing plate and containing a solid electrolyte disposed between the positive electrode material, the negative electrode material, and the positive electrode material and the negative electrode material. The all-solid-state battery 1 may include a gasket arranged between the peripheral wall portion of the outer can and the power generation element. The peripheral wall portion of the outer can may have a tip portion that is crimped toward the upper surface of the peripheral end portion of the sealing plate.

Further, preferably, the central portion of the sealing plate may be formed to be thicker than the peripheral end portion by rising from the upper surface side of the sealing plate. The lower surface of the sealing plate may be flat.

Further, preferably, the central portion of the sealing plate may have a thickness of 1.5 to 3 times that of the peripheral end portion.

Further, preferably, the central portion of the sealing plate may have an area of 70 to 90% of the sealing plate in a plan view.

Further, preferably, the peripheral end portion of the sealing plate may be provided with a protrusion at the end portion of the upper surface of the peripheral end portion. The gasket may be arranged between the peripheral wall portion and the protrusion portion. The peripheral wall portion may have a tip portion that is crimped toward the protrusion.

Further, preferably, the protrusion may have a height of 0.03 to 0.08 mm from the upper surface of the peripheral end portion.

Further, preferably, the gasket may have a tubular shape and a substantially I-shaped cross section. The peripheral side surface of the power generation element may be in contact with the inner peripheral surface of the gasket. The outer peripheral surface of the gasket may be in contact with the inner peripheral surface of the peripheral wall portion of the outer can.

According to the all-solid-state battery according to the present disclosure, it is possible to increase the battery capacity by effectively utilizing the internal space while reducing the size.

FIG. 1 is a cross-sectional view showing the structure of the all-solid-state battery according to the first embodiment. FIG. 2 is an enlarged cross-sectional view of the all-solid-state battery shown in FIG. FIG. 3 is a plan view showing the structure of the sealing plate used in the all-solid-state battery shown in FIG. FIG. 4 is a cross-sectional view showing the structure of the all-solid-state battery according to the second embodiment.

(First Embodiment)
Hereinafter, the first embodiment of the present disclosure will be specifically described with reference to FIGS. 1 to 3. First, as shown in FIG. 1, the all-solid-state battery 1 is basically composed of an outer can 2, a sealing plate 3, a power generation element 4, and a gasket 5. Further, the all-solid-state battery 1 includes a graphite sheet 6 arranged between the outer can 2 and the power generation element 4, and a graphite sheet 6 arranged between the sealing plate 3 and the power generation element 4. In the first embodiment, the all-solid-state battery 1 is a flat battery.

The outer can 2 includes a circular bottom portion 21 and a cylindrical peripheral wall portion 22 formed continuously from the outer periphery of the bottom portion 21. The peripheral wall portion 22 is provided so as to extend substantially perpendicular to the bottom portion 21 in a vertical cross-sectional view. The outer can 2 is made of a metal material such as stainless steel, nickel, or iron. The shape of the outer can 2 is not limited to the cylindrical shape provided with the circular bottom portion 21. For example, the shape of the outer can 2 may be such that the bottom portion 21 is formed in a polygonal shape such as a quadrangular shape, and the peripheral wall portion 22 is formed in a polygonal tubular shape such as a square cylinder that matches the shape of the bottom portion 21. Various changes can be made according to the size and shape of the battery 1. Therefore, the shape of the peripheral wall portion 22 includes not only a cylindrical shape but also a polygonal tubular shape such as a square tubular shape.

The sealing plate 3 is formed in a circular flat plate shape. The sealing plate 3 has a peripheral end portion 31 and a central portion 32 formed to be thicker than the peripheral end portion 31. The sealing plate 3 faces the opening of the outer can 2. The outer diameter of the sealing plate 3 is smaller than the inner diameter of the peripheral wall portion 22 of the outer can 2. The sealing plate 3 is made of a metal material such as stainless steel, nickel, or iron. The sealing plate 3 is formed in a plan view shape corresponding to the opening of the outer can 2. Therefore, the plan view shape of the sealing plate 3 is not limited to a circle, and may be formed into a polygonal shape such as a quadrangular shape.

The sealing plate 3 is formed with a relatively thick central portion 32 that rises from the upper surface side of the peripheral end portion 31. As a result, the strength of the sealing plate 3 can be improved against the pressure applied from above the sealing plate 3. Further, the lower surface of the sealing plate 3 is formed to be flat. As a result, the pressure applied from above the sealing plate 3 is uniformly transmitted to the power generation element 4, so that damage to the power generation element 4 can be suppressed. The lower surface of the sealing plate 3 has the same size and shape as the upper surface of the negative electrode material 42 of the power generation element 4 described later, and has the same size and shape as the upper surface of the graphite sheet 6 adjacent to the negative electrode material 42.

As shown in FIG. 2, the thickness t2 of the central portion 32 is 1.5 to 3 times the thickness t1 of the peripheral end portion 31. When the thickness t2 is reduced, the all-solid-state battery 1 can be miniaturized, but the sealing plate 3 is easily deformed by the pressure from above. Therefore, the power generation element 4 may be damaged and the battery performance may be deteriorated. On the other hand, if the thickness t2 is increased, the strength of the sealing plate 3 can be improved, but the volume of the entire all-solid-state battery 1 is increased, and the all-solid-state battery 1 is not miniaturized. Therefore, the thickness t2 is preferably 1.5 times or more, preferably 2 times or more the thickness t1, and is preferably 3 times or less, preferably 2.5 times or less the thickness t2.

As shown in FIG. 3, in a plan view, the central portion 32 has an area of 70 to 90% of the sealing plate 3. When the area of the central portion 32 is increased, the strength of the sealing plate 3 is improved, but the ratio of the area occupied by the peripheral end portion 31 is decreased. Therefore, when crimping the tip of the peripheral wall portion 22 of the outer can 2, the tip of the gasket 5 on the sealing plate 3 side comes into contact with the central portion 32, which makes the caulking work difficult. Further, if the tip end portion of the peripheral wall portion 22 of the outer can 2 comes into contact with the central portion 32, a short circuit may occur. On the other hand, if the area of the central portion 32 is narrowed, the strength of the sealing plate 3 is reduced. Therefore, the area of the central portion 32 of the sealing plate 3 is preferably 70% or more, preferably 75% or more, and 90% or less, preferably 85% or less of the sealing plate 3. Good.

When crimping the outer can 2 and the sealing plate 3, the tip of the peripheral wall portion 22 of the outer can 2 and the tip of the gasket 5 are a step between the peripheral end portion 31 and the central portion 32 of the sealing plate 3, that is, the circumference. It is accommodated in the space above the peripheral end portion 31 formed by the height difference between the end portion 31 and the central portion 32. Therefore, the radial lengths of the tip end portion of the peripheral wall portion 22 of the outer can 2 and the tip end portion of the gasket 5 positioned on the upper surface of the sealing plate 3 by bending are shorter than the radial length of the peripheral end portion 31.

Further, as shown in FIG. 2, a protrusion 33 is formed on the upper surface of the peripheral end portion 31 of the sealing plate 3. The protrusion 33 is formed in a ring shape in a plan view along the end of the peripheral end portion 31. The protrusion 33 has a height h of 0.03 to 0.08 mm from the upper surface of the peripheral end portion 31. A gasket 5 is arranged between the protrusion 33 and the tip of the peripheral wall portion 22 of the outer can 2. The tip of the peripheral wall portion 22 of the outer can 2 is crimped so as to be curved toward the protrusion 33. By providing the protrusion 33 in this way, the tip of the gasket 5 on the sealing plate 3 side is locked to the protrusion 33, and the outer can 2 and the sealing plate 3 are sufficiently crimped. The internal space of the all-solid-state battery 1 can be maintained in a sealed state. The height h of the protrusion 33 is preferably 0.03 mm or more, preferably 0.04 mm or more, and 0.08 mm or less, in consideration of appropriately caulking the outer can 2 and the sealing plate 3. It is preferably 0.07 mm or less.

The power generation element 4 is housed between the outer can 2 and the sealing plate 3, and includes a positive electrode material 41, a negative electrode material 42, and a solid electrolyte 43. The solid electrolyte 43 is arranged between the positive electrode material 41 and the negative electrode material 42. The power generation element 4 is laminated in the order of the positive electrode material 41, the solid electrolyte 43, and the negative electrode material 42 from the bottom 21 side (lower part in the drawing) of the outer can 2. The power generation element 4 is formed in a cylindrical shape. The power generation element 4 is arranged on the upper surface of the bottom 21 of the outer can 2 via a graphite sheet 6. Therefore, the outer can 2 functions as a positive electrode can. Further, the power generation element 4 faces the lower surface of the sealing plate 3 via the graphite sheet 6. Therefore, the sealing plate 3 functions as a negative electrode plate. The power generation element 4 is not limited to the cylindrical shape, and can be variously changed according to the size and shape of the all-solid-state battery 1, such as a rectangular parallelepiped shape and a polygonal prism shape. Further, the power generation element 4 may be arranged so that the negative electrode material 42 is positioned on the outer can 2 side and the positive electrode material 41 is positioned on the sealing plate 3 side. In that case, the outer can 2 functions as a negative electrode can, and the sealing plate 3 functions as a positive electrode plate.

_{The positive electrode material 41 contains LiNi 0.6} Co _0.2 Mn _0.2 O ₂ having an average particle size of 3 μm and a sulfide solid electrolyte (Li ₆ PS ₅ Cl) as the positive electrode active material used in the lithium ion secondary battery. This is a positive electrode pellet formed into a cylindrical shape by putting 180 mg of a positive electrode mixture containing carbon nanotubes, which are conductive aids, in a mass ratio of 55:40: 5 into a mold having a diameter of 10 mm. The positive electrode material 41 is not particularly limited as long as it can function as the positive electrode material of the power generation element 4. For example, lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium nickel cobalt manganese composite oxide, and the like. It may be an olivine type composite oxide or the like, or it may be a mixture thereof as appropriate. Further, the size and shape of the positive electrode material 41 are not limited to the cylindrical shape, and can be variously changed according to the size and shape of the all-solid-state battery 1.

_{The negative electrode material 42 contains LTO (Li 4} Ti ₅ O ₁₂ , lithium titanate), a sulfide solid electrolyte (Li ₆ PS ₅ Cl), and carbon nanotubes as negative electrode active materials used in a lithium ion secondary battery. It is a negative electrode pellet obtained by molding 300 mg of a negative electrode mixture contained in a weight ratio of 50:45: 5 into a cylindrical shape. The negative electrode material 42 is not particularly limited as long as it can function as the negative electrode material of the power generation element 4. For example, carbon materials such as metallic lithium, lithium alloy, graphite, and low crystal carbon, SiO, and LTO. (Li ₄ Ti ₅ O ₁₂ , lithium titanate) or the like may be used, or a mixture thereof may be used as appropriate. Further, the size and shape of the negative electrode material 42 are not limited to the cylindrical shape, and can be variously changed according to the size and shape of the all-solid-state battery 1.

The solid electrolyte 43 is formed by molding 60 mg of a sulfide solid electrolyte (Li ₆ PS ₅ Cl) into a cylindrical shape. The solid electrolyte 43 is not particularly limited, but may be another sulfur-based solid electrolyte such as an algyrodite type from the viewpoint of ionic conductivity. When a sulfur-based solid electrolyte is used, it is preferable to coat the surface of the positive electrode active material with niobium oxide in order to prevent the reaction with the positive electrode active material. Further, the solid electrolyte 43 may be a hydride-based solid electrolyte, an oxide-based solid electrolyte, or the like. Further, the size and shape of the solid electrolyte 43 are not limited to the cylindrical shape, and can be variously changed according to the size and shape of the all-solid-state battery 1.

The gasket 5 is formed of a low moisture permeable resin such as polypropylene resin, polyphenylene sulfide resin, and PFA resin. The gasket 5 is formed in a tubular shape along the inner peripheral surface of the peripheral wall portion 22 of the outer can 2, and is arranged between the peripheral wall portion 22 of the outer can 2 and the power generation element 4. As shown in FIG. 2, the gasket 5 has a thickness t3 of 0.05 to 0.2 mm in the radial direction. The gasket 5 may be formed relatively thin as long as it can insulate the peripheral wall portion 22 of the outer can 2 and the negative electrode material 42 and can insulate the peripheral wall portion 22 of the outer can 2 and the sealing plate 3. The internal space of the all-solid-state battery 1 becomes wider as the gasket 5 becomes thinner. Therefore, the battery capacity of the all-solid-state battery 1 can be increased. However, if the gasket 5 becomes too thin, it may be damaged. If the gasket 5 is damaged, a short circuit may occur. Therefore, the thickness t3 of the gasket 5 is preferably 0.05 mm or more, preferably 0.07 mm or more, and 0.2 mm or less, preferably 0.15 mm or less.

Further, the gasket 5 has a substantially I-shaped cross section as shown in FIG. The peripheral side surface of the power generation element 4 is in contact with the inner peripheral surface of the gasket 5, and the outer peripheral surface of the gasket 5 is in contact with the inner peripheral surface of the peripheral wall portion 22 of the outer can 2. In the battery of Patent Document 1 described above, the gasket has a substantially J-shaped cross section folded back on the tip end side of the inner wall portion of the sealing can. Therefore, it becomes difficult to arrange the gasket. On the other hand, since the gasket 5 according to the present disclosure has a substantially I-shaped cross section, it can be easily and simply arranged between the peripheral side surface of the power generation element 4 and the peripheral wall portion 22 of the outer can 2. it can. Further, in the all-solid-state battery 1, the gasket 5 has a substantially I-shaped cross section, the outer peripheral surface of the power generation element 4 is in contact with the inner peripheral surface of the gasket 5, and the outer peripheral surface of the gasket 5 is the peripheral wall portion 22 of the outer can 2. By contacting the inner peripheral surface of the battery 1, the internal space of the all-solid-state battery 1 can be effectively used and the battery capacity can be increased.

In this way, the all-solid-state battery 1 can effectively utilize the internal space of the all-solid-state battery 1 and increase the battery capacity by covering the opening of the outer can 2 with the flat plate-shaped sealing plate 3. Further, by crimping the tip end portion of the peripheral wall portion 22 of the outer can 2 toward the peripheral end portion 31 of the sealing plate 3, the outer can 2 and the sealing plate 3 can be sufficiently crimped while reducing the size. it can.

The graphite sheet 6 is formed by rolling expanded graphite. The plan-view shape of the graphite sheet 6 is formed to be substantially similar to the plan-view shape of the internal space of the all-solid-state battery 1. Therefore, the graphite sheet 6 is formed in a substantially circular shape in a plan view. The area of the upper surface of the graphite sheet 6 on the outer can 2 side may be the same as the area of the lower surface of the positive electrode material 41 of the power generation element 4, or may be larger than the area of the lower surface of the positive electrode material 41 of the power generation element 4. Good. Further, the area of the lower surface of the graphite sheet 6 on the sealing plate 3 side may be the same as the area of the upper surface of the negative electrode material 42 of the power generation element 4, or slightly smaller than the area of the upper surface of the negative electrode material 42 of the power generation element 4. It may be smaller. That is, the upper surface of the graphite sheet 6 on the outer can 2 side may cover the lower surface of the positive electrode material 41. Further, it is desirable that the lower surface of the graphite sheet 6 on the sealing plate 3 side does not protrude from the peripheral edge of the upper surface of the negative electrode material 42 in order to prevent the force applied at the time of caulking from concentrating on the end portion. The graphite sheet 6 is not limited to a substantially circular shape in a plan view, and can be variously changed according to the plan view shape of the all-solid-state battery 1, such as an elliptical shape and a substantially polygonal shape in a plan view.

More specifically, the graphite sheet 6 is manufactured as follows. First, the particles of acid-treated graphite obtained by subjecting natural graphite to acid treatment are heated. Then, the acid-treated graphite expands by vaporizing and foaming the acid between the layers. The expanded graphite (expanded graphite) is molded into a felt shape and further rolled using a roll rolling machine to form a sheet body. The graphite sheet 6 is manufactured by hollowing out the expanded graphite sheet body into a circular shape. As described above, expanded graphite is formed by vaporizing the acid and foaming the acid-treated graphite. Therefore, the graphite sheet 6 is formed into a porous sheet. Therefore, the graphite sheet 6 has excellent flexibility due to its porosity as well as the conductivity of graphite itself. The method for producing the graphite sheet 6 is not limited to this, and the graphite sheet 6 may be produced by any method.

As mentioned above, the graphite sheet 6 has excellent conductivity and flexibility. Therefore, the graphite sheet 6 can function as a current collector and absorbs expansion and contraction of the power generation element 4 due to charging and discharging, or pressing force when crimping the outer can 2 and the sealing plate 3. Can be done. As a result, the all-solid-state battery 1 can suppress deterioration of battery performance due to damage to the power generation element 4 and formation of gaps.

The all-solid-state battery 1 is not provided with the graphite sheet 6, and is arranged so that the positive electrode material 41 is in contact with the upper surface of the bottom 21 of the outer can 2, and the negative electrode material 42 is in contact with the lower surface of the sealing plate 3. May be good. Further, the graphite sheet 6 may be arranged only on either the positive electrode material 41 side or the negative electrode material 42 side. Further, in the all-solid-state battery 1, instead of the graphite sheet 6, at least one of the negative electrode material 42 side and the positive electrode material 41 side is made of a metal foil such as copper, nickel, stainless steel, aluminum and titanium, a porous base material, and a porous base material. , A non-woven fabric of carbon fibers such as carbon nanotubes may be provided as a current collecting sheet.

(Production method)
Next, a method of manufacturing the all-solid-state battery 1 will be described with reference to FIG.

First, the outer can 2 and the sealing plate 3 described above are prepared. In this state, the peripheral wall portion 22 of the outer can 2 has a tip portion that is not yet curved inward, and extends in a straight line substantially perpendicular to the bottom portion 21 in a vertical cross-sectional view.

Next, the above-mentioned tubular gasket 5 is arranged on the inner peripheral surface of the peripheral wall portion 22 of the outer can 2. The tip of the gasket 5 on the sealing plate 3 side is not curved inward, and extends linearly toward the tip in a vertical cross-sectional view.

Next, the power generation element 4 and the two graphite sheets 6 are housed inside the outer can 2. The power generation element 4 and the two graphite sheets 6 are laminated in this order from the bottom 21 of the outer can 2, the graphite sheet 6 on the positive electrode material 41 side, the power generation element 4, and the graphite sheet 6 on the negative electrode material 42 side.

Next, the sealing plate 3 is arranged on the upper surface of the graphite sheet 6 on the negative electrode material 42 side. At this time, the lower surface of the sealing plate 3 formed on a flat surface faces the upper surface of the graphite sheet 6 on the negative electrode material 42 side. Further, a gasket 5 is positioned between the peripheral wall portion 22 of the outer can 2 and the peripheral end portion 31 of the sealing plate 3.

Finally, the tip of the peripheral wall portion 22 of the outer can 2 is curved inward and downward in the direction of the protrusion 33 of the sealing plate 3 together with the tip of the gasket 5, and the outer can 2 and the sealing plate 3 are crimped. Thereby, the all-solid-state battery 1 can be manufactured.

(Second Embodiment)
Next, the all-solid-state battery 1 of the second embodiment will be specifically described with reference to FIG. The same configuration as the all-solid-state battery 1 of the first embodiment will be omitted, and only the configuration different from the all-solid-state battery 1 of the first embodiment will be described.

As shown in FIG. 4, the lower surface of the sealing plate 3 may have an uneven structure. The uneven structure is formed in a substantially grid pattern in a plan view by a plurality of groove portions 34 extending at predetermined intervals and a plurality of groove portions 34 extending at predetermined intervals orthogonal to the plurality of groove portions 34. By forming the uneven structure in this way, the graphite sheet 6 on the negative electrode material 42 side can increase the contact area with the lower surface of the sealing plate 3, that is, the current collecting area. The groove 34 is not limited to a substantially grid pattern in a plan view. For example, the plan view shape of the groove portion 34 may be a vertical stripe shape extending in parallel in the vertical direction, or a polka dot shape in which a plurality of groove portions 34 such as a circular shape or a ring shape are arranged in a predetermined balance. .. On the contrary, it may be in the shape of polka dots in which a plurality of circular or ring-shaped ridges are arranged in a predetermined balance. The uneven structure also includes a structure in which a groove 34 is provided on a part of the lower surface of the sealing plate 3, for example, the lower surface of the thick central portion 32. Further, the uneven structure may be provided on the upper surface of the bottom portion 21 of the outer can 2. Further, the uneven structure may be provided on either the lower surface of the sealing plate 3 or the upper surface of the bottom portion 21 of the outer can 2.

Although the embodiments have been described above, the present disclosure is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the embodiments.

1 All-solid-state battery 2 Exterior can, 21 Bottom, 22 Peripheral wall 3 Seal plate, 31 Peripheral end, 32 Central part, 33 Protrusion, 34 Groove 4 Power generation element, 41 Positive electrode material, 42 Negative electrode material, 43 Solid electrolyte 5 Gasket 6 Graphite sheet

Claims (7)

An exterior can with a bottom and a peripheral wall,
A sealing plate that covers the opening of the outer can and has a peripheral end portion and a central portion that is thicker than the peripheral end portion.
A power generation element housed between the bottom of the outer can and the sealing plate and containing a positive electrode material, a negative electrode material, and a solid electrolyte arranged between the positive electrode material and the negative electrode material.
A gasket provided between the peripheral wall portion of the outer can and the power generation element is provided.
The peripheral wall portion of the outer can is an all-solid-state battery having a tip portion crimped toward the upper surface of the peripheral end portion of the sealing plate. The all-solid-state battery according to claim 1.
The central portion of the sealing plate is formed to be thicker than the peripheral end portion by protruding from the upper surface side of the sealing plate.
An all-solid-state battery in which the lower surface of the sealing plate is flat. The all-solid-state battery according to claim 1 or 2.
The central portion of the sealing plate is an all-solid-state battery having a thickness of 1.5 to 3 times that of the peripheral end portion. The all-solid-state battery according to any one of claims 1 to 3.
The central portion of the sealing plate is an all-solid-state battery having an area of 70 to 90% of the sealing plate in a plan view. The all-solid-state battery according to any one of claims 1 to 4.
The peripheral end portion of the sealing plate is provided with a protrusion at the end portion of the upper surface of the peripheral end portion.
The gasket is arranged between the peripheral wall portion and the protrusion portion, and is arranged.
The tip of the peripheral wall is an all-solid-state battery that is crimped toward the protrusion. The all-solid-state battery according to claim 5.
The protrusion is an all-solid-state battery having a height of 0.03 to 0.08 mm from the upper surface of the peripheral end portion. The all-solid-state battery according to any one of claims 1 to 6.
The gasket has a tubular shape and a substantially I-shaped cross section.
The peripheral side surface of the power generation element is in contact with the inner peripheral surface of the gasket.
An all-solid-state battery in which the outer peripheral surface of the gasket is in contact with the inner peripheral surface of the peripheral wall portion of the outer can.

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