All-solid battery and method for manufacturing the same

Abstract

To provide an all-solid battery that improves its quality by preventing the occurrence of cracks.SOLUTION: An all-solid battery 1 is formed with, on a lower surface 3d, a width-direction downward inclined part 15 inclined downward toward both ends 14 in a y-direction from a central position in the y-direction, on a width-direction cross section parallel to a first end face at a central position 13 in an x-direction, and, on an upper surface 3c, a width-direction upward inclined part 19 inclined upward toward both ends 18 in the y-direction from the central position 17 in the y-direction, on a width-direction cross section parallel to the first end face at the central position in the x-direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an all-solid-state battery suitable for use as, for example, an SMD (Surface Mount Device), and a method for manufacturing the same. [Background technology]

[0002] All-solid-state batteries using oxide-based or sulfide-based solid electrolytes are known. Patent Document 1 discloses that good cycle characteristics can be obtained by adjusting the warpage of the laminate of the all-solid-state battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 189599 Summary of the Invention [Problem to be solved by the invention]

[0004] However, even if a warped shape is given as in Patent Document 1, there is still a risk of quality problems occurring, such as cracks during firing, cracks and abnormalities in OCV (Open Circuit Voltage) during reflow mounting, and cracks during charge / discharge measurements.

[0005] As a result of extensive research, the present inventors have found that by further optimizing the shape of the all-solid-state battery, it is possible to suppress the occurrence of cracks and the like, thereby improving the quality of the all-solid-state battery.

[0006] The present invention has been made in view of the above circumstances, and aims to provide an all-solid-state battery and a manufacturing method thereof in which the quality is improved by suppressing the occurrence of cracks and the like. [Means for solving the problem]

[0007] An all-solid-state battery according to one aspect of the present invention comprises a main body portion having an approximately rectangular parallelepiped outer shape surrounded by an insulating layer, in which a positive electrode layer, a solid electrolyte layer, an anode layer, and an insulating layer are stacked in a stacking direction, a first external electrode provided on a first end face of the main body portion extending in the stacking direction, and a second external electrode provided on a second end face of the main body portion opposite to the first end face, wherein one surface intersecting the stacking direction is an upper surface and the other surface is a lower surface, and when the extension direction of the first end face is defined as a width direction when the top surface is viewed in a plan view and a direction perpendicular to the width direction is defined as an orthogonal direction, the lower surface has a width direction parallel to the first end face at a center position in the orthogonal direction. On the cut surface, a widthwise downward inclined portion is formed which slopes downward from the center position in the width direction toward each of the two ends in the width direction, and on the cut surface perpendicular to the first end surface at the center position in the width direction, a perpendicular downward inclined portion is formed which slopes downward from the center position in the width direction toward each of the two ends in the width direction, and on the upper surface, a widthwise upward inclined portion is formed which slopes upward from the center position in the width direction toward each of the two ends in the width direction on the cut surface perpendicular to the first end surface, and a perpendicular upward inclined portion is formed which slopes upward from the center position in the width direction toward each of the two ends in the orthogonal direction on the cut surface perpendicular to the

[0008] The upper and lower surfaces of the body of the all-solid-state battery, which is a substantially rectangular parallelepiped, are each provided with an inclined portion that slopes from the center toward both ends. This allows the shape of the all-solid-state battery to be substantially symmetrical in the vertical, width, and orthogonal directions, and even if thermal expansion or contraction occurs, the battery deforms substantially isotropically, mitigating stress concentration, making it less susceptible to cracking and realizing an all-solid-state battery with excellent quality and improved durability. Note that "approximately rectangular parallelepiped" does not mean a perfect rectangular parallelepiped, but includes something that is roughly a rectangular parallelepiped, and also includes a cube.

[0009] Furthermore, in the all-solid-state battery according to one aspect of the present invention, when a surface parallel to the stacking direction is defined as a horizontal plane, an angle A1 is formed between a line connecting a center position in the width direction of the lower surface and both ends in the width direction and the horizontal plane, an angle B1 is formed between a line connecting a center position in the width direction of the upper surface and both ends in the width direction and the horizontal plane, an angle A2 is formed between a line connecting a center position in the orthogonal direction of the lower surface and both ends in the orthogonal direction and the horizontal plane, and an angle B2 is formed between a line connecting a center position in the orthogonal direction of the upper surface and both ends in the orthogonal direction and the horizontal plane, A1 and B1 are 4.1° or more and 7.9° or less, and A2 and B2 are 0.9° or more and 2.8° or less.

[0010] By setting A1 and B1 to 4.1° or more and 7.9° or less, and A2 and B2 to 0.9° or more and 2.8° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs.

[0011] Furthermore, in the all-solid-state battery according to one aspect of the present invention, when a plane passing through a central position in a stacking direction of the main body portion is defined as a horizontal plane, an angle A1 is defined as an angle formed by a line connecting a central position in the width direction of the lower surface to both ends in the width direction and the horizontal plane, and an angle A2 is defined as an angle formed by a line connecting a central position in the orthogonal direction of the lower surface to both ends in the orthogonal direction and the horizontal plane, the arithmetic mean of A1 and A2 is 2.5° or more and 4.2° or less.

[0012] By setting the arithmetic mean of A1 and A2, ie, (A1+A2) / 2, to 2.5° or more and 4.2° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs.

[0013] Furthermore, in the all-solid-state battery according to one aspect of the present invention, when a plane passing through a central position in a stacking direction of the main body portion is defined as a horizontal plane, an angle formed by a line connecting a central position in the width direction of the upper surface to both ends in the width direction and the horizontal plane is defined as B1, and an angle formed by a line connecting a central position in the orthogonal direction of the upper surface to both ends in the orthogonal direction and the horizontal plane is defined as B2, the arithmetic mean of B1 and B2 is 2.9° or more and 5.3° or less.

[0014] By setting the arithmetic mean of B1 and B2, ie, (B1+B2) / 2, to 2.9° or more and 5.3° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs.

[0015] Furthermore, in the all-solid-state battery according to one aspect of the present invention, the insulating layer is made of a glass material.

[0016] By using a glass material for the insulating layer, the permeability to moisture and gas can be reduced, and durability can be improved.

[0017] A method for manufacturing an all-solid-state battery according to one aspect of the present invention is any of the methods for manufacturing an all-solid-state battery described above, wherein when the positive electrode layer, the solid electrolyte layer, the negative electrode layer, and the insulating layer are stacked to form the main body portion, an inclined portion is formed while sandwiching the main body portion with the top surface and a molding member in contact with the top surface.

[0018] The mold member may be a metal plate or a cushion material made of silicone. [Effects of the Invention]

[0019] By suppressing the occurrence of cracks, etc., the quality of all-solid-state batteries can be improved. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing the external shape of an all-solid-state battery according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the main body of the all-solid-state battery of FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 4 is a longitudinal cross-sectional view taken along the line IV-IV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the external appearance of an all-solid-state battery 1. The all-solid-state battery 1 includes a substantially rectangular parallelepiped main body 3, a first external electrode 5a, and a second external electrode 5b. In Fig. 1, the width direction of the substantially rectangular parallelepiped all-solid-state battery 1 is the y direction, the longitudinal direction perpendicular to the y direction is the x direction, and the height direction is the z direction.

[0022] The main body 3 has a first end surface 3a perpendicular to the x direction and a second end surface 3b opposite the first end surface 3a. The main body 3 also has an upper surface 3c perpendicular to the z direction and a lower surface 3d opposite the upper surface 3c. The main body 3 also has a right side surface 3e perpendicular to the y direction and a left side surface 3f opposite the right side surface. The top, bottom, left, and right directions in FIG. 1 are positional relationships defined when the all-solid-state battery 1 is arranged as shown in the figure.

[0023] The first external electrode 5a is provided so as to cover the entire first end face 3a, and the second external electrode 5b is provided so as to cover the entire second end face 3b.

[0024] Fig. 2 shows a cross-sectional view of the main body 3 of the all-solid-state battery 1. As shown in the figure, a positive electrode layer 7, a solid electrolyte layer 8, and a negative electrode layer 9 are alternately stacked, with insulating layers 11 provided above and below. As can be seen from Fig. 2, the z direction is the stacking direction.

[0025] The insulating layer 11 is provided so as to surround the four sides of the main body 3 (the top surface 3c, the bottom surface 3d, the right side surface 3e, and the left side surface 3f, excluding the two end surfaces 3a and 3b), and the insulating layer 11 forms the outer shape of the all-solid-state battery 1. Note that the number of layers 7, 8, 9, and 11 stacked is not limited to the number shown in FIG. 2. Furthermore, the length of each of the positive electrode layer 7, the solid electrolyte layer 8, and the negative electrode layer 9 is not limited either.

[0026] 3 shows a cross section of the all-solid-state battery 1 taken along the III-III cutting line in FIG. 1. The III-III cutting line extends in the width direction (y direction) and is located at the center of the all-solid-state battery 1 in the x direction (longitudinal direction). The cross section cut along the III-III cutting line is the width direction cross section. Note that in FIG. 3, the inclinations of the upper surface 3c and the lower surface 3d are exaggerated to make it easier to understand the external shape of the main body 3 of the all-solid-state battery 1.

[0027] The lower surface 3d is formed with widthwise downward inclined portions 15 that slope downward from a central position 13 in the width direction (y direction) toward both ends 14 in the width direction (y direction). The widthwise downward inclined portions 15 on both sides are provided approximately symmetrically with respect to the central position 13. An angle A1 formed between a line connecting the central position 13 and each end 14 and the horizontal plane is 4.1° or more and 7.9° or less. The horizontal plane is a plane parallel to the stacking direction of the main body portion 3.

[0028] The upper surface 3c is formed with widthwise upward inclined portions 19 that slope upward from a central position 17 in the width direction (y direction) toward both ends 18 in the width direction (y direction). The widthwise upward inclined portions 19 on both sides are provided approximately symmetrically with respect to the central position 17. Angle B1 formed between a line connecting the central position 17 and each end 18 and the horizontal plane is 4.1° or more and 7.9° or less.

[0029] 4 shows a longitudinal cross section of the all-solid-state battery 1 taken along the IV-IV cutting line in FIG. 1. The IV-IV cutting line extends in the longitudinal direction (x direction) and is located at the center of the all-solid-state battery 1 in the y direction (width direction). The cross section cut along the IV-IV cutting line is the longitudinal cross section (orthogonal cross section). Note that in FIG. 4, the inclinations of the upper surface 3c and the lower surface 3d are exaggerated to make it easier to understand the external shape of the main body 3 of the all-solid-state battery 1.

[0030] The lower surface 3d is formed with longitudinally downwardly inclined portions 22 that slope downward from a central position 13 in the longitudinal direction (x direction) toward both ends 21 in the longitudinal direction (x direction). The longitudinally downwardly inclined portions 22 on both sides are provided approximately symmetrically with respect to the central position 13. An angle A2 formed between a line connecting the central position 13 and each end 21 and the horizontal plane is 0.9° or more and 2.8° or less.

[0031] The upper surface 3c is formed with longitudinally upwardly inclined portions 24 that incline upward from a central position 17 in the longitudinal direction (x direction) toward both ends 23 in the longitudinal direction (x direction). The longitudinally upwardly inclined portions 24 on both sides are provided approximately symmetrically with respect to the central position 17. Angle B2 formed between a line connecting the central position 17 and each end 23 and the horizontal plane is 0.9° or more and 2.8° or less.

[0032] In FIGS. 3 and 4, the arithmetic mean of the angle A1 and the angle A2, ie, (A1+A2) / 2, is preferably set to be equal to or greater than 2.5° and equal to or less than 4.2°. In addition, in FIGS. 3 and 4, the arithmetic mean of angles B1 and B2, ie, (B1+B2) / 2, is preferably set to be equal to or greater than 2.9° and equal to or less than 5.3°.

[0033] Next, the above-mentioned all-solid-state battery 1 was manufactured as follows. 1. Paste Preparation 1-1. Preparation of positive electrode paste to be used as the positive electrode layer 7 The positive electrode active material was Li2CoP2O7 powder (LCPO powder) and the solid electrolyte was Li 1.5 Al 0.5 Ge 1.5The mixture consisted of 100 parts by mass of (PO4)3 powder (LAGP powder) and vapor-grown carbon fiber powder (VGCF powder) as a conductive additive, 200 parts by mass of polyvinyl butyral as a binder, triethylene glycol bis(2-ethylhexanoate) (Sumitomo Chemical Co., Ltd., G-260) as a plasticizer, HIPLAAD ED350 (HIPLAAD is a registered trademark of Kusumoto Chemical Co., Ltd.) as a dispersant, and terpineol as a diluent. After mixing these materials in a ball mill for 24 to 72 hours, the mixture was mixed and dispersed in a three-roll mill and dispersed using a particle gauge until the material aggregates were 1 μm or less, yielding a positive electrode paste.

[0034] 1-2. Preparation of negative electrode paste to form negative electrode layer 9 A negative electrode paste was obtained in the same manner as in the preparation of the positive electrode paste, except that the same amount of titanium oxide was used as the negative electrode active material instead of the positive electrode active material.

[0035] 1-3. Preparation of electrolyte paste for solid electrolyte layer 8 Li as a solid electrolyte 1.5 Al 0.5 Ge 1.5 For 100 parts by mass of (PO4)3 powder (LAGP powder), 200 parts by mass of polyvinyl butyral as a binder, triethylene glycol bis(2-ethylhexanoate) (G-260, manufactured by Sumitomo Chemical Co., Ltd.) as a plasticizer, HIPLAAD ED350 manufactured by Kusumoto Chemical Co., Ltd. as a dispersant, and terpineol as a diluent were used. These were mixed in a ball mill for 24 to 72 hours, then mixed and dispersed in a three-roll mill, and dispersed using a particle gauge until the material aggregates were 1 μm or less, to obtain an electrolyte paste.

[0036] 1-4. Preparation of insulating layer paste to become insulating layer 11 The insulating layer paste was prepared in the same manner as the electrolyte paste, except that glass powder and ceramic powder were used instead of the LAGP powder used in the electrolyte paste.

[0037] The insulating layer may have any electronic insulating properties, but it is preferable that it has low moisture and gas permeability and good sealing properties. Among these, it is preferable that it has a linear expansion coefficient similar to that of each layer constituting the solid-state battery body and has good adhesion to each layer. Materials that can be used to form the insulating layer include glass, ceramics, and solid electrolyte layers. The insulating layer is also called a cover layer or outermost layer.

[0038] Examples of such glasses include SnO-B2O3-P2O5-Al2O3, SiO2-B2O3-BaO-ZnO, SiO2-B2O3-Bi2O3-ZnO, ZnO-Bi2O3-B2O3, SiO2-Bi2O3, B2O3-P2O5-Na2O-CaO-BaO-Al2O3, SnO-P2O5, SnO-B2O3-P2O5, SiO2-SnO-P2O5, SiO2-B2O3-R2O, Si O2-B2O3-ZnO-Na2O-NaF-V2O5, SnO-ZnO-P2O5-R2O-R2O, SiO2-B2O3-ZnO, SiO2-B2O3-Al2O3-ZrO2, SiO2-B2O3-ZnO-R2O-R2O, SiO2-B2O3-Al2O3-R2O-R2O, etc. (Note that R represents an alkali metal, and R2 represents an alkaline earth metal.)

[0039] Examples of the ceramics include alumina, ferrite, zirconia, zircon, barium zirconate, calcium zirconate, titanium oxide, barium titanate, strontium titanate, calcium titanate, magnesium titanate, zinc titanate, lanthanum titanate, neodymium titanate, lead zirconate titanate, alumina nitride, silicon nitride, boron nitride, boron carbide, barium stannate, calcium stannate, magnesium silicate, mullite, steatite, cordierite, forsterite, and the like.

[0040] 1-5.External electrodes 5a, 5b Various conductive materials can be used for the external electrodes 5a, 5b. For example, the external electrodes may be formed by drying and hardening a conductive paste containing conductive particles such as metal particles of silver (Ag), copper (Cu), nickel (Ni), or carbon particles, or by depositing various metals using a sputtering method, plating method, or the like.

[0041] 2. Fabrication of All-Solid-State Battery 1 2-1. Preparation of the positive electrode mixture layer part The electrolyte paste was pattern-printed on a PET film using a screen printing method and dried at 90°C for 10 minutes. The positive electrode paste was pattern-printed on top of the PET film using a screen printing method and dried at 90°C for 10 minutes. Next, the insulating paste (embedding paste) was printed around the pattern-printed positive electrode paste using a screen printing method and then dried at 90°C for 10 minutes. These operations were repeated until the desired thickness was achieved. This produced a positive electrode mixture layer part having a laminated structure of PET film / electrolyte mixture layer / positive electrode mixture layer and the surrounding insulating mixture layer.

[0042] 2-2. Preparation of negative electrode mixture layer parts A negative electrode mixture layer part was produced in the same manner as the positive electrode mixture layer part, except that the negative electrode paste was used instead of the positive electrode paste, thereby producing a negative electrode mixture layer part having a laminated structure of PET film / electrolyte mixture layer / negative electrode mixture layer and the surrounding insulating mixture layer.

[0043] 2-3. Preparation of the upper and lower insulating layers that will become the insulating layer 11 The insulating paste was printed solidly (over the entire surface) on a PET film and then dried, thereby producing an upper insulating layer and a lower insulating layer each having a laminated structure of a PET film / insulating mixture layer.

[0044] 2-4. Fabrication of laminate The positive electrode (negative electrode) mixture layer part prepared above was laminated on the insulating mixture layer of the lower cover prepared above so that the positive electrode (negative electrode) mixture layer was in contact with the insulating mixture layer of the lower cover, and the parts were thermocompression bonded to transfer the positive electrode (negative electrode) mixture layer / electrolyte mixture layer.

[0045] Next, a negative electrode (positive electrode) mixture layer part was laminated on the transferred positive electrode (negative electrode) mixture layer / electrolyte mixture layer so that the negative electrode (positive electrode) mixture layer was in contact with the insulating mixture layer, and the layers were thermocompression bonded to transfer the negative electrode (positive electrode) mixture layer / electrolyte mixture layer.

[0046] The above-mentioned transfer of the positive electrode (negative electrode) mixture layer part and the negative electrode (positive electrode) mixture layer part was repeated until a predetermined number of layers was reached. Finally, an insulating mixture layer, which is an upper cover, was similarly laminated and transferred by thermocompression bonding. The laminate was produced under thermocompression bonding conditions of 20 to 100 MPa and 50 to 80°C.

[0047] When fabricating the laminate, molding components such as metal plates and silicone cushioning materials are arranged to sandwich the laminate, and the warpage angles A1, A2, B1, and B2 (see Figures 3 and 4) are adjusted by combining the metal plates and silicone cushioning materials. In this case, the laminate may be sandwiched between metal plates on the bottom and top sides of the laminate, or sandwiched between metal plates and cushioning materials on the bottom and top sides of the laminate. Furthermore, the warpage angle of the all-solid-state battery 1 can be adjusted by fabricating the laminate using a stacking method in which the laminate is sandwiched between cushioning materials on the bottom and top sides. The saddle phenomenon of each layer can also be utilized to adjust the warpage angle.

[0048] Next, this laminate was processed so that the planar dimensions after firing were 4.5 mm × 3.2 mm, and then placed flat on a porous ceramic plate and heated at 500°C for 1 to 10 hours in an air atmosphere to remove the binder components, followed by sintering at 600°C to 650°C for 2 to 10 hours in a nitrogen atmosphere.

[0049] A first external electrode 5a and a second external electrode 5b were formed to cover the first end face 3a and the second end face 3b of the fired main body 3. The external electrodes 5a and 5b were formed by applying a silver-containing main material and then plating the surface with Ni and Sn. This resulted in the production of an all-solid-state battery as shown in FIG.

[0050] The all-solid-state battery manufactured as described above was subjected to the following tests. (Charge / discharge conditions) The battery was charged at a constant current of 0.1 mA at 23°C until it reached 3.4 V, and then charged at a constant voltage for 5 hours after reaching 3.4 V. It was then discharged at a constant current of 0.1 mA at 23°C with a cutoff voltage of 0 V. This constitutes one cycle, and a 30-cycle charge-discharge test was performed.

[0051] The test results are shown in Table 1. The crack occurrence rate is expressed as a percentage of the number of cracks visually observed relative to the total number of tests. The insulating layer 11, the outermost layer of the all-solid-state battery 1, is made of a glass material that has electronic insulation properties and low moisture and gas permeability. However, when cracks occur, they react with external moisture and gas, resulting in insufficient charge / discharge characteristics. If this reaction causes the positive electrode material, negative electrode material, and electrolyte material inside the all-solid-state battery 1 to leak out through the cracks, it may contaminate or destroy other electronic components during assembly. In this case, the battery will not be able to maintain sufficient insulation, causing a short circuit and a deterioration in quality.

[0052] [Table 1]

[0053] As can be seen from Table 1, when A1 and B1 are set to 4.1° or more and 7.9° or less, and when A2 and B2 are set to 0.9° or more and 2.8° or less, the crack occurrence rate decreases.

[0054] Table 2 below summarizes the arithmetic mean of A1 and A2, (A1+A2) / 2, and the arithmetic mean of B1 and B2, (B1+B2) / 2, based on the above test results.

[0055] [Table 2]

[0056] As can be seen from Table 2, when the arithmetic mean of the angle A1 and the angle A2, (A1+A2) / 2, is set to 2.5° or more and 4.2° or less, the crack occurrence rate decreases. Furthermore, when the arithmetic mean of angles B1 and B2, (B1+B2) / 2, is set to 2.9° or more and 5.3° or less, the crack occurrence rate decreases.

[0057] The above-described embodiment has the following advantages. The upper surface 3c and the lower surface 3d of the main body 3 of the all-solid-state battery 1, which is a substantially rectangular parallelepiped, are each provided with inclined portions 15, 19, 22, and 24 that incline from central positions 13 and 17 toward both ends 14, 18, 21, and 23. This allows the shape of the all-solid-state battery 1 to be substantially symmetrical in the vertical, widthwise, and orthogonal directions, and even if thermal expansion or thermal contraction occurs, the battery deforms substantially isotropically, which alleviates stress concentration and makes it possible to realize an all-solid-state battery that is less susceptible to cracking and has excellent durability.

[0058] By setting A1 and B1 to 4.1° or more and 7.9° or less, and A2 and B2 to 0.9° or more and 2.8° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs.

[0059] By setting the arithmetic mean of A1 and A2, ie, (A1+A2) / 2, to 2.5° or more and 4.2° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs.

[0060] By setting the arithmetic mean of B1 and B2, ie, (B1+B2) / 2, to 2.9° or more and 5.3° or less, it is possible to suppress the occurrence of cracks even when thermal expansion or thermal contraction occurs. [Explanation of symbols]

[0061] 1 All-solid-state battery 3 Main body 3a 1st end surface 3b Second end surface 3c Top surface 3d bottom surface 3e Right side 3F left side 5a 1st external electrode 5b 2nd external electrode 7 Positive electrode layer 8 Solid electrolyte layer 9. Negative electrode layer 11 Insulating layer 13 Center position 14 Both ends 15 Lower slope in width direction 17 Center position 18 Both ends 19 Upper slope in width direction 21 Both ends 22 Longitudinal downward inclined portion (orthogonal downward inclined portion) 23 Both ends 24 Longitudinal upward inclined portion (orthogonal upward inclined portion)

Claims

1. a main body having a substantially rectangular parallelepiped outer shape, in which a positive electrode layer, a solid electrolyte layer, a negative electrode layer, and an insulating layer are stacked in a stacking direction and surrounded by the insulating layers; a first external electrode provided on a first end surface of the main body portion extending in the stacking direction; a second external electrode provided on a second end surface of the main body portion opposite the first end surface; Equipped with When one surface intersecting the stacking direction is defined as an upper surface, the other surface is defined as a lower surface, and when the upper surface is viewed in a plan view, the extending direction of the first end surface is defined as a width direction, and the direction perpendicular to the width direction is defined as an orthogonal direction, The lower surface is formed with a widthwise downward inclined portion that is inclined downward from the widthwise center position toward both ends in the width direction in a widthwise cut surface that is parallel to the first end surface at a center position in the orthogonal direction, and an orthogonal direction downward inclined portion that is inclined downward from the widthwise center position toward both ends in the orthogonal direction in an orthogonal cut surface that is orthogonal to the first end surface at a widthwise center position, an upper surface of the all-solid-state battery, in which: a widthwise upper inclined portion inclined upward from a center position in the width direction toward both ends in the width direction on the widthwise cut surface; and an orthogonal upper inclined portion inclined upward from a center position in the orthogonal direction toward both ends in the orthogonal direction on the orthogonal cut surface.

2. A plane parallel to the stacking direction is defined as a horizontal plane, The angle formed by the line connecting the center position in the width direction of the lower surface and both ends in the width direction with the horizontal plane is defined as A1, and the angle formed by the line connecting the center position in the width direction of the upper surface and both ends in the width direction with the horizontal plane is defined as B1. When the angle formed by the line connecting the center position of the lower surface in the orthogonal direction to both ends in the orthogonal direction and the horizontal plane is A2, and the angle formed by the line connecting the center position of the upper surface in the orthogonal direction to both ends in the orthogonal direction and the horizontal plane is B2, The A1 and B1 are set to be equal to or greater than 4.1° and equal to or less than 7.9°, The A2 and B2 are 0.9° or more and 2.8° or less The all-solid-state battery according to claim 1.

3. a plane passing through a center position in the stacking direction of the main body portion is defined as a horizontal plane; A1 is an angle formed by a line connecting the center position of the lower surface in the width direction and each end of the width direction with the horizontal plane, When the angle formed by the line connecting the center position of the lower surface in the orthogonal direction and each end in the orthogonal direction with the horizontal plane is A2, The all-solid-state battery according to claim 1, wherein the arithmetic mean of A1 and A2 is 2.5° or more and 4.2° or less.

4. a plane passing through a center position in the stacking direction of the main body portion is defined as a horizontal plane; An angle formed by a line connecting the center position of the upper surface in the width direction and each end of the width direction with the horizontal plane is defined as B1, When the angle formed by the line connecting the center position of the upper surface in the orthogonal direction and each end in the orthogonal direction with the horizontal plane is B2, The all-solid-state battery according to claim 1, wherein the arithmetic mean of B1 and B2 is 2.9° or more and 5.3° or less.

5. The all-solid-state battery according to claim 1 , wherein the insulating layer is made of a glass material.

6. A method for producing the all-solid-state battery according to any one of claims 1 to 5, a method for manufacturing an all-solid-state battery, wherein when the positive electrode layer, the solid electrolyte layer, the negative electrode layer, and the insulating layer are stacked to form the main body portion, a sloped portion is formed while the main body portion is sandwiched between the top surface and a molding member in contact with the top surface.

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