All-solid-state battery

Abstract

An all-solid-state battery according to the present invention comprises: an all-solid-state battery cell (1) that has two main surfaces opposite from each other and a side surface linking the two main surfaces; a tab (2, 2a) for extracting power; and laminate outer packaging bodies (3a, 3b) that enclose the all-solid-state battery cell (1) and the base end portion of the tab (2, 2a). The laminate outer packaging bodies (3a, 3b) are respectively provided with insulating and flexible sheets on the two main surfaces of the all-solid-state battery cell (1). An end portion of each of the sheets has a folded section (31a, 31e) that has been folded once and folded back. The folded sections (31a, 31e) each have a bonding part, which has a protruding shape extending toward the cell outer shell of the all-solid-state battery cell (1), is disposed along the outer peripheral surface of the all-solid-state battery cell (1), and is bonded to the tab (2, 2a) or the adjacent folded section (31a, 31e). Adhesive layers (4a, 4e), which are respectively present inside the protruding shapes of the folded sections (31a, 31e), are each formed from an elastic adhesive member.

Description

all solid state battery

[0001] This invention relates to an all-solid-state battery.

[0002] Solid-state batteries consist of solid-state battery cells enclosed in an insulating casing. These cells contain a power generation element that generates electricity through chemical reactions. The materials that make up the power generation element react with oxygen and moisture, generating gas and degrading as a result. Therefore, the inside of the casing containing the solid-state battery cell needs to be kept low in oxygen and moisture. To address this, the casing is often constructed from a flexible membrane, and the inside is vacuumed. However, vacuuming causes the casing to plastically deform, forming wrinkles. The power generation element in the solid-state battery cell expands and contracts with charging and discharging due to the properties of the materials used. When the solid-state battery cell expands and contracts, load is applied to the wrinkled areas (plastically deformed areas) of the casing. As a result, there is a risk of holes forming in these areas. If holes form in the casing, oxygen and moisture can penetrate from the outside into the inside. This can lead to degradation of the solid-state battery cell. Therefore, Patent Document 1 discloses a technique in which the outer periphery connecting the upper and lower surfaces of the outer casing is made into a bellows structure, thereby enabling the outer casing to withstand the expansion and contraction of the all-solid-state battery cell.

[0003] Japanese Patent Publication No. 2019-139872

[0004] In the technology disclosed in Patent Document 1, the outer periphery connecting the upper and lower surfaces of the casing is made of a bellows structure, but the bellows structure has many folds. When repeated loads are applied to the folds due to the expansion and contraction of the all-solid-state battery cell, the folds are repeatedly folded and unfolded. The casing deteriorates due to repeated folding and unfolding, and as a result, there is a risk that holes or cracks will form in the casing. If holes or cracks form in the casing, oxygen and moisture can penetrate from the outside to the inside of the casing. Therefore, there is a risk that the all-solid-state battery cell will ultimately deteriorate.

[0005] This invention has been made in view of the above circumstances, and aims to provide an all-solid-state battery equipped with an outer casing that can further suppress the degradation of all-solid-state battery cells.

[0006] To achieve the above objective, the all-solid-state battery according to the present invention includes an all-solid-state battery cell having two opposing main surfaces and a side surface connecting the two main surfaces, a tab connected to the all-solid-state battery cell for drawing power from the all-solid-state battery cell, and a laminate casing that encloses the base ends of the all-solid-state battery cell and the tab. The laminate casing comprises insulating and flexible sheets laminated on each of the two main surfaces of the all-solid-state battery cell. Each sheet has a folded portion at its end that is folded back at least once. The folded portion has a convex shape toward the cell shell of the all-solid-state battery cell, is arranged along the outer circumferential surface of the all-solid-state battery cell, and has a joint that joins with the tab or an adjacent folded portion. The adhesive layer inside the convex shape of the folded portion is formed of an elastic adhesive member.

[0007] According to the present invention, the stress applied to the outer casing due to the expansion and contraction of the all-solid-state battery cell can be reduced or suppressed. This suppresses the deterioration of the outer casing and, consequently, the deterioration of the all-solid-state battery cell due to the deterioration of the outer casing.

[0008] This is a top view of the all-solid-state battery according to Embodiment 1 of the present invention. This is a bottom view of the all-solid-state battery according to Embodiment 1 of the present invention. This is a cross-sectional view of the tab portion of the all-solid-state battery shown in Figure 1A. This is a cross-sectional view of the tabless portion of the all-solid-state battery shown in Figure 1A. This is a cross-sectional view of the joint portion of the all-solid-state battery shown in Figure 1A. This is an unfolded view of the sheet constituting the laminate casing according to Embodiment 1 of the present invention. This is a diagram illustrating the effects when the adhesive layer according to Embodiment 1 of the present invention does not adhere to the laminate casing. This is a diagram illustrating the effects when the adhesive layer shown in Figure 3A adheres to the laminate casing. This is a diagram showing the configuration of the bent portion of the laminate casing of the all-solid-state battery according to Embodiment 2 of the present invention. This is a diagram showing the configuration of the bent portion of the laminate casing of the all-solid-state battery according to Embodiment 3 of the present invention. This is a diagram showing the shape when the end portion of the bent portion shown in Figure 5A is bent toward the adhesive layer. This is a diagram showing the shape when the end portion of the bent portion shown in Figure 5A is bent toward the outer shell side of the all-solid-state battery cell. This is a diagram for explaining the load applied to the bent portion of the laminate casing of the all-solid-state battery according to Embodiment 4 of the present invention. This figure illustrates how the load applied to the bent portion shown in Figure 6A is distributed. This figure illustrates the shape of the adhesive layer that is less prone to cracking according to Embodiment 5 of the present invention. This figure illustrates a shape that is more prone to cracking than the shape of the adhesive layer shown in Figure 7A. This figure illustrates the thickness of the adhesive layer according to Embodiment 6 of the present invention. This figure illustrates how the adhesive layer is provided around the entire circumference of the bent portion according to Embodiment 7 of the present invention. This is a cross-sectional view of the adhesive layer shown in Figure 9A. This figure illustrates how a passage and a projection are provided in a part of the adhesive layer of the bent portion according to Embodiment 8 of the present invention. This is an enlarged view of the passage and projection of the adhesive layer shown in Figure 10A. This is a cross-sectional view of the projection shown in Figure 10B.

[0009] An embodiment of the all-solid-state battery according to the present invention will be described with reference to the drawings. In each drawing, the same or equivalent parts are denoted by the same reference numerals.

[0010] (Embodiment 1) The all-solid-state battery 100 according to Embodiment 1 is composed of all-solid-state battery cells that are sandwiched and sealed between two insulating sheets in a laminate outer casing. In the following description, an XYZ Cartesian coordinate system is set up in which the width direction of the all-solid-state battery 100 is the X-axis direction, the height direction of the all-solid-state battery 100 is the Z-axis direction, and the direction perpendicular to the X-axis direction and the Z-axis direction is the Y-axis direction, and this will be referred to as appropriate in the description. In addition, the direction in which the arrows on each axis point is the + axis direction, and the direction opposite to the arrow is the - axis direction.

[0011] Figure 1A is a plan view of the all-solid-state battery 100 according to Embodiment 1, viewed from above (in the +Z-axis direction), and Figure 1B is a plan view of the all-solid-state battery 100, viewed from below (in the -Z-axis direction). Figure 2A is a cross-sectional view taken along the line A-A' in Figure 1A, Figure 2B is a cross-sectional view taken along the line B-B' in Figure 1A, and Figure 2C is a cross-sectional view taken along the line C-C' in Figure 1A. As shown in the figures, the all-solid-state battery 100 includes an all-solid-state battery cell 1, a positive electrode tab 2a, a negative electrode tab 2b, and a laminate casing 3.

[0012] The all-solid-state battery cell 1 has an overall shape that is roughly rectangular. A positive electrode tab 2a is located at the +X axis end of the all-solid-state battery cell 1, and a negative electrode tab 2b is located at the -X axis end. The all-solid-state battery cell 1 supplies power to the outside through the positive electrode tab 2a and the negative electrode tab 2b. The laminate casing 3 encloses the all-solid-state battery cell 1 and the base end portion, which is the connection point between the positive electrode tab 2a and the negative electrode tab 2b of the all-solid-state battery cell 1.

[0013] The all-solid-state battery cell 1 is a battery element. The all-solid-state battery cell 1 comprises a plurality of stacked plate-shaped power generation elements 11. Each power generation element 11 has a rectangular plate shape in plan view. Therefore, the shape of the all-solid-state battery cell 1 is a rectangular parallelepiped. In this embodiment, the plurality of power generation elements 11 include a first positive electrode element 11a, a first negative electrode element 11b, a second positive electrode element 11c, a second negative electrode element 11d, a third positive electrode element 11e, a third negative electrode element 11f, a fourth positive electrode element 11g, and a fourth negative electrode element 11h.

[0014] The first positive electrode element 11a and the first negative electrode element 11b are sandwiched between the first current collector foil 12a and the second current collector foil 12b. The second positive electrode element 11c and the second negative electrode element 11d are sandwiched between the second current collector foil 12b and the third current collector foil 12c. The third positive electrode element 11e and the third negative electrode element 11f are sandwiched between the third current collector foil 12c and the fourth current collector foil 12d. The fourth positive electrode element 11g and the fourth negative electrode element 11h are sandwiched between the fourth current collector foil 12d and the fifth current collector foil 12e. The first to fifth current collector foils 12a to 12e are composed of an insulating sheet and layers of conductive material arranged on both sides thereof, and have the functions of both wiring and separators. The first to fifth current collector foils 12a to 12e are collectively referred to as current collector foil 12.

[0015] The conductive layers in contact with the first positive electrode elements 11a to 4th positive electrode elements 11g of the first current collector foils 12a to 4th current collector foils 12d are connected to the base end of the positive electrode tab 2a via wiring 13 (first wiring 13a, second wiring 13b, third wiring 13c, fourth wiring 13d). Furthermore, the conductive layers in contact with the first negative electrode elements 11b to 4th negative electrode elements 11h of the second current collector foils 12b to 5th current collector foils 12e are connected to the base end of the negative electrode tab 2b via wiring (not shown). This allows the power generated by the all-solid-state battery cell 1 to be supplied to an external circuit via tabs 2 (2a, 2b).

[0016] The positive electrode tab 2a is connected via wiring 13 to the conductive layer of the first current collector foil 12a to the fourth current collector foil 12d that is in contact with the first positive electrode elements 11a to the fourth positive electrode elements 11g, and is also connected to an external circuit. The negative electrode tab 2b is connected via wiring (not shown) to the conductive layer of the second current collector foil 12b to the fifth current collector foil 12e that is in contact with the first negative electrode elements 11b to the fourth negative electrode elements 11h, and is also connected to an external circuit. The positive electrode tab 2a and the negative electrode tab 2b are, for example, sheet-like or plate-like conductors and are arranged substantially parallel to the power generation element 11 and the current collector foil 12.

[0017] The laminated casing 3 is formed from a first laminated casing 3a and a second laminated casing pair 3b, which have a cross shape in plan view and possess gas barrier properties, environmental resistance, and electrical insulation properties, as shown in Figure 2D, and an adhesive that also possesses gas barrier properties, environmental resistance, and electrical insulation properties. The laminated casing 3 hermetically and watertightly seals the power generation element 11, the current collector foil 12, the wiring 13, the base ends of the positive electrode tab 2a and the negative electrode tab 2b, etc. The inside of the laminated casing 3 is under vacuum and maintained in a reduced pressure state. As a result, the all-solid-state battery cell 1 is protected from the external environment, including oxygen and moisture.

[0018] In Embodiment 1, as shown in the unfolded view of Figure 2D, the first laminated casing 3a and the second laminated casing 3b have the same shape and size. The first laminated casing 3a and the second laminated casing 3b each have a rectangular central portion and rectangular tongue-shaped portions on each of the four sides of the central portion. The central portion of the first laminated casing 3a is laminated to the main surface of the all-solid-state battery cell 1 in the +Z axis direction. The central portion of the second laminated casing 3b is laminated to the main surface of the all-solid-state battery cell 1 in the -Z axis direction. The tongue-shaped portions extending in four directions from the central portions of the first laminated casing 3a and the second laminated casing 3b are folded as described below. For this reason, these tongue-shaped portions will be referred to as folded portions 31 below. Also, although Figures 1A and 1B are plan views, hatching is added to the areas where the folded portions 31 are located for distinction. The first laminated outer casing 3a and the second laminated outer casing 3b have, for example, insulating properties, environmental resistance, and gas barrier properties, and are composed of sheets formed by coating both sides of a sheet of metal material with a resin material. The metal material is composed of, for example, aluminum or copper. The resin material is preferably composed of, for example, a polyolefin resin such as polyethylene, and has high environmental resistance and high electrical insulation properties.

[0019] As shown in Figure 2D, the first laminated outer casing 3a comprises a central portion and a first folded portion 31a, a second folded portion 31b, a third folded portion 31c, and a fourth folded portion 31d connected to the central portion. Similarly, the second laminated outer casing 3b comprises a central portion and a fifth folded portion 31e, a sixth folded portion 31f, a seventh folded portion 31g, and an eighth folded portion 31h connected to the central portion.

[0020] As shown in Figure 2A, the first folded portion 31a of the first laminate outer casing 3a is folded in a mountain fold along the +X axis side of the all-solid-state battery cell 1, then valley-folded and protruding from the +X axis side of the all-solid-state battery cell 1, extending in the outer shell direction in the +X axis direction with the all-solid-state battery cell 1 as the starting point, and further folded back at the first plastic deformation portion 33a, extending in the -X axis direction along the positive electrode tab 2a.

[0021] Similarly, the second bent portion 31b is folded in a mountain fold along the -Y axis side of the all-solid-state battery cell 1, then valley-folded so as to protrude from the -Y axis side of the all-solid-state battery cell 1 in the direction of the outer shell in the -Y axis direction with the all-solid-state battery cell 1 as the starting point, and then folded back at the second plastically deformed portion 33b and extends in the +Y axis direction.

[0022] Similarly, the third bent portion 31c is folded in a mountain fold along the -X axis side surface of the all-solid-state battery cell 1, and then valley-folded so as to protrude from the -X axis side surface of the all-solid-state battery cell 1 toward the outer shell in the -X axis direction with the all-solid-state battery cell 1 as the starting point, and is further folded back at the third plastic deformation portion 33c and extends in the +X axis direction along the negative electrode tab 2b.

[0023] Similarly, the fourth bent portion 31d is folded in a mountain fold along the side surface of the all-solid-state battery cell 1 in the +Y axis direction, and then folded in a valley fold so as to protrude from the side surface of the all-solid-state battery cell 1 in the +Y axis direction from the all-solid-state battery cell 1 as the starting point in the outer shell direction in the +Y axis direction, and is further folded back at the fourth plastically deformed portion 33d and extends in the -Y axis direction.

[0024] The fifth to eighth folded portions 31e to 31h of the second laminated outer casing 3b are folded in a mountain fold to follow the side surface of the solid-state battery cell 1, similar to the first to fourth folded portions 31a to 31d of the first laminated outer casing 3a. Subsequently, they are folded in a valley fold and protrude outwards from the side surface of the solid-state battery cell 1, with the solid-state battery cell 1 as the starting point. Furthermore, they are folded back at the plastic deformation portions 33 (fifth to eighth plastic deformation portions 33e to 33h) and extend toward the solid-state battery cell 1.

[0025] In the first laminated outer casing 3a, the first bent portion 31a and the second bent portion 31b are adjacent, and the adjacent portion is referred to as the first joint portion 32a. The second bent portion 31b and the third bent portion 31c are adjacent, and the adjacent portion is referred to as the second joint portion 32b. The third bent portion 31c and the fourth bent portion 31d are adjacent, and the adjacent portion is referred to as the third joint portion 32c. The fourth bent portion 31d and the first bent portion 31a are adjacent, and the adjacent portion is referred to as the fourth joint portion 32d. The first to fourth bent portions 31a to 4th bent portions 31d are discontinuous, and each is independently arranged on the outer circumference of the all-solid-state battery cell 1. For this reason, in the first joint portions 32a to 4th joint portions 32d, there is a gap between adjacent bent portions 31 to prevent them from interfering with each other.

[0026] Furthermore, the connection portion between the first bent portion 31a and the positive electrode tab 2a is referred to as the fifth joint portion 32e. The connection portion between the third bent portion 31c and the negative electrode tab 2b is referred to as the sixth joint portion 32f. The fifth joint portion 32e is the portion where the positive electrode tab 2a is fixed to the first bent portion 31a. The sixth joint portion 32f is the portion where the negative electrode tab 2b is fixed to the third bent portion 31c.

[0027] Similarly, in the second laminated outer casing 3b, the fifth bent portion 31e and the sixth bent portion 31f are adjacent, and the adjacent portion is referred to as the seventh joint portion 32g. The sixth bent portion 31f and the seventh bent portion 31g are adjacent, and the adjacent portion is referred to as the eighth joint portion 32h. The seventh bent portion 31g and the eighth bent portion 31h are adjacent, and the adjacent portion is referred to as the ninth joint portion 32i. The eighth bent portion 31h and the fifth bent portion 31e are adjacent, and the adjacent portion is referred to as the tenth joint portion 32j. The fifth bent portion 31e to the eighth bent portion 31h are discontinuous, and each is independently arranged on the outer circumference of the all-solid-state battery cell 1. For this reason, the seventh joint portion 32g to the tenth joint portion 32j separate adjacent bent portions 31 from each other, so as not to interfere with each other.

[0028] Furthermore, the connection portion between the fifth bent portion 31e and the positive electrode tab 2a is referred to as the eleventh joint portion 32k. The connection portion between the seventh bent portion 31g and the negative electrode tab 2b is referred to as the twelfth joint portion 32l. The eleventh joint portion 32k is the portion where the positive electrode tab 2a is fixed to the fifth bent portion 31e. The twelfth joint portion 32l is the portion where the negative electrode tab 2b is fixed to the seventh bent portion 31g.

[0029] In the following description, the first bent portion 31a to the eighth bent portion 31h will be collectively referred to as the bent portion 31. The positive electrode tab 2a and the negative electrode tab 2b will be collectively referred to as the tab 2. The first joint portion 32a to the twelfth joint portion 32l will be collectively referred to as the joint portion 32.

[0030] As shown in Figures 1A and 2A-2C, the first bent portion 31a of the first laminated exterior 3a is provided with a striped first adhesive layer 4a that adheres the first laminated exterior 3a that have been folded back at the first plastic deformation portion 33a. Similarly, the second bent portion 31b is provided with a striped second adhesive layer 4b that adheres the first laminated exterior 3a that have been folded back at the second plastic deformation portion 33b. The third bent portion 31c is provided with a striped third adhesive layer 4c that adheres the first laminated exterior 3a that have been folded back at the third plastic deformation portion 33c. The fourth bent portion 31d is provided with a striped fourth adhesive layer 4d that adheres the first laminated exterior 3a that have been folded back at the fourth plastic deformation portion 33d.

[0031] Further, as shown in FIGS. 1B and 2A - 2C, the fifth bending portion 31e of the second laminate exterior body 3b includes a fifth adhesive layer 4e formed by an adhesive for bonding the second laminate exterior bodies 3b folded back at the fifth plastic deformation portion 33e. Similarly, the sixth bending portion 31f includes a sixth adhesive layer 4f for bonding between the second laminate exterior bodies 3b folded back at the sixth plastic deformation portion 33f. The seventh bending portion 31g includes a seventh adhesive layer 4g for bonding between the second laminate exterior bodies 3b folded back at the seventh plastic deformation portion 33g. The eighth bending portion 31h includes an eighth adhesive layer 4h for bonding between the second laminate exterior bodies 3b folded back at the eighth plastic deformation portion 33h. The first adhesive layer 4a to the eighth adhesive layer 4h are formed of an elastic adhesive member. The adhesive layer 4 preferably has elasticity, electrical insulation, and environmental resistance after curing, and is formed of, for example, a silicone resin, silicone rubber, epoxy rubber, or the like.

[0032] A first seal layer 5a is provided on the surface on the -Z axis side (the surface on the positive electrode tab 2a side) of the first bending portion 31a of the first laminate exterior body 3a. A second seal layer 5b is provided on the surface on the -Z axis side of the second bending portion 31b. A third seal layer 5c is provided on the surface on the -Z axis side (the surface on the negative electrode tab 2b side) of the third bending portion 31c. A fourth seal layer 5d is provided on the surface on the -Z axis side of the fourth bending portion 31d.

[0033] Furthermore, a ninth seal layer 5i is provided on the +Z axis side (positive electrode tab 2a side) of the fifth bent portion 31e of the second laminate outer casing 3b. The first seal layer 5a and the ninth seal layer 5i seal the space between the first bent portion 31a, the positive electrode tab 2a, and the fifth bent portion 31e in an airtight and watertight manner. A tenth seal layer 5j is provided on the +Z axis side of the sixth bent portion 31f. The second seal layer 5b and the tenth seal layer 5j seal the space between the second bent portion 31b and the sixth bent portion 31f in an airtight and watertight manner. An eleventh seal layer 5k is provided on the +Z axis side (negative electrode tab 2b side) of the seventh bent portion 31g. The third seal layer 5c and the eleventh seal layer 5k provide an airtight and watertight seal between the third bent portion 31c, the negative electrode tab 2b, and the seventh bent portion 31g. A twelfth seal layer 5l is provided on the +Z axis side surface of the eighth bent portion 31h. The fourth seal layer 5d and the twelfth seal layer 5l provide an airtight and watertight seal between the fourth bent portion 31d and the eighth bent portion 31h.

[0034] Furthermore, a fifth seal layer 5e, formed from a gas barrier adhesive, is provided in the gap between the fourth bent portion 31d and the first bent portion 31a to seal the gap between them. Similarly, a sixth seal layer 5f is provided between the first bent portion 31a and the second bent portion 31b to seal the gap between them. A seventh seal layer 5g is provided between the second bent portion 31b and the third bent portion 31c to seal the gap between them. An eighth seal layer 5h is provided between the third bent portion 31c and the fourth bent portion 31d to seal the gap between them.

[0035] Further, between the eighth bending portion 31h and the fifth bending portion 31e, a 13th seal layer 5m for sealing the space therebetween is provided. Between the fifth bending portion 31e and the sixth bending portion 31f, a 14th seal layer 5n for sealing the space therebetween is provided. Between the sixth bending portion 31f and the seventh bending portion 31g, a 15th seal layer 5o for sealing the space therebetween is provided. Between the seventh bending portion 31g and the eighth bending portion 31h, a 16th seal layer 5p for sealing the space therebetween is provided. The seal layer 5 is preferably composed of a material having gas barrier properties, electrical insulation properties, and environmental resistance. For example, silicone resin, epoxy resin, etc. are desirable.

[0036] With the above configuration, the laminated exterior body 3 can seal the base ends of the all-solid-state battery cell 1 and the tab 2.

[0037] The all-solid-state battery 100 is formed, for example, by the following procedure. Connect the all-solid-state battery cell 1, the positive electrode tab 2a, and the negative electrode 2b via the wiring 13. In parallel, prepare the first laminated exterior body 3a and the second laminated exterior body 3b in a state where the tongue-like portions are folded to form the first bending portion 31a to the eighth bending portion 31h. Apply an adhesive at predetermined positions on the inner surfaces of the respective bending portions of the first bending portion 31a to the eighth bending portion 31h by a dispenser or the like to form uncured adhesive layers 4a to 4h. Subsequently, place the all-solid-state battery cell 1 at the central portion of the second laminated exterior body 3b, and arrange the base ends of the positive electrode tab 2a and the negative electrode tab 2b on the bending portions 31e and 31g. Next, arrange the first laminated exterior body 3a in alignment with the position for enclosing the all-solid-state battery cell 1, the base end of the positive electrode tab 2a, and the base end of the negative electrode tab 2b, and temporarily fix them. Thereafter, transfer the formed body into a decompression chamber, apply the uncured adhesive at necessary locations by a dispenser or the like under a decompressed environment to form uncured seal layers 5a to 5p. Subsequently, perform heating or light irradiation to cure the adhesive layers 4a to 4h and the seal layers 5a to 5p. Thereby, the laminated exterior body 3 is formed, and the base ends of the all-solid-state battery cell 1, the positive electrode tab 2a, and the negative electrode tab 2b are hermetically sealed. Thereafter, take out the completed body from the decompression chamber.

[0038] Due to its characteristics, the all-solid-state battery cell 1 expands and contracts with charging and discharging. For example, when the all-solid-state battery cell 1 expands, a tensile load in the +Z axis direction is applied to the first laminate casing 3a that seals the all-solid-state battery cell 1. At this time, for example, as shown in Figure 3A, if there is a space 4s between the first bent portion 31a and the first adhesive layer 4a at the first bent portion 31a (i.e., the first laminate casings 3a are not bonded together by the first adhesive layer 4a), the tensile load is directly input to the first plastically deformed portion 33a. As a result, the first plastically deformed portion 33a is pulled in the +Z axis direction.

[0039] Furthermore, when the all-solid-state battery cell 1 shrinks, a tensile load in the -Z axis direction is applied to the first laminate casing 3a that seals the all-solid-state battery cell 1. In this case as well, the tensile load is directly input to the first plastically deformed portion 33a. As a result, the first plastically deformed portion 33a is pulled in the -Z axis direction. Therefore, as the all-solid-state battery cell 1 repeatedly expands and contracts, the first plastically deformed portion 33a moves repeatedly in the +Z axis direction and the -Z axis direction. Consequently, the first plastically deformed portion 33a may not be able to withstand the load of movement and may develop a hole. In addition, the tensile load is also input to the first seal layer 5a via the first plastically deformed portion 33a. As the first plastically deformed portion 33a moves repeatedly in the +Z axis direction and the -Z axis direction, the first seal layer 5a also moves repeatedly in the +Z axis direction and the -Z axis direction. As a result, the first seal layer 5a becomes more likely to peel off from the positive electrode tab 2a.

[0040] Therefore, in this embodiment 1, as shown in Figure 3B, the first laminate outer casings 3a that have been bent at the first plastic deformation portion 33a are bonded together at the first bent portion 31a with a first adhesive layer 4a. In this case, the tensile load generated by the expansion and contraction of the all-solid-state battery cell 1 is input not only to the first plastic deformation portion 33a but also to the first adhesive layer 4a. The first adhesive layer 4a is formed of an elastic adhesive. Therefore, when a tensile load is input to the first adhesive layer 4a, the first adhesive layer 4a functions as an elastic body. As a result, the first adhesive layer 4a deforms, and the tensile load input to the first adhesive layer 4a can be distributed according to the spring constant of the first adhesive layer 4a. Therefore, the tensile load input to the first plastic deformation portion 33a of the first laminate outer casing 3a can be reduced. As a result, the first plastic deformation portion 33a can be protected from perforation. Furthermore, the first adhesive layer 4a can also distribute the tensile load applied to the first seal layer 5a via the first plastically deformed portion 33a. This makes it difficult for the first seal layer 5a to peel off from the positive electrode tab 2a. The same applies to the second bent portions 31b to the fourth bent portions 31d of the first laminated outer casing 3a and the second laminated outer casing 3b. It is also desirable that the adhesive layer 4 be softer (have a smaller elastic modulus) than the seal layer 5. The desired elasticity can be determined in advance through experiments, and the composition of the adhesive can be adjusted to achieve that elasticity.

[0041] As described above, in the all-solid-state battery 100 according to this embodiment 1, the laminate outer casing 3, which is bent at the plastic deformation portion 33 that forms the bent portion 31 of the laminate outer casing 3, is bonded to each other by an adhesive layer 4 made of an elastic adhesive. As a result, the laminate outer casing 3 can distribute the tensile load applied to the plastic deformation portion 33, which is the mountain fold portion of the bent portion 31. Therefore, the input of tensile load to the plastic deformation portion 33 is reduced, and the opening of holes in the plastic deformation portion 33 can be prevented. Furthermore, the adhesive layer 4 can also distribute the tensile load applied to the seal layer 5 via the plastic deformation portion 33. As a result, the seal layer 5 is less likely to peel off from the tab 2. Therefore, the sealing performance of the laminate outer casing 3 is improved, making it difficult for oxygen and moisture to penetrate from the outside, and thus preventing deterioration of the all-solid-state battery cell 1.

[0042] (Embodiment 2) In Embodiment 1, the folded portion 31 of the laminated outer casing 3 was folded once. However, the folded portion 31 may be folded two or more times. Therefore, in Embodiment 2, a configuration in which the folded portion 31 is folded two or more times is shown. Here, the first folded portion 31a of the first laminated outer casing 3a is used as an example, but the same applies to the second folded portions 31b to the fourth folded portions 31d and the second laminated outer casing 3b. Also, for brevity, general terms are used for reference numerals as appropriate. The configuration shown in Figure 4 is one in which the folded portion 31 is folded three times. The folded portion 31A includes a first plastically deformed portion 34a, a second plastically deformed portion 34b, and a third plastically deformed portion 34c. A first adhesive layer 41a is placed between the inner surfaces of the laminated outer casing 3 folded at the first plastically deformed portion 34a. A second adhesive layer 41b is placed between the inner surfaces of the laminate exterior 3 bent at the second plastic deformation portion 34b. A third adhesive layer 41c is placed between the inner surfaces of the laminate exterior 3 bent at the third plastic deformation portion 34c. Hereafter, the first plastic deformation portion 34a, the second plastic deformation portion 34b, and the third plastic deformation portion 34c will be collectively referred to as the plastic deformation portion 34. Also, the first adhesive layer 41a, the second adhesive layer 41b, and the third adhesive layer 41c will be collectively referred to as the adhesive layer 41.

[0043] The adhesive layer 41 is formed of an elastic adhesive, such as silicone resin, silicone rubber, or epoxy rubber. As a result, the adhesive layer 41 has more layers than the adhesive layer 4 of Embodiment 1, which increases the spring constant. This allows the adhesive layer 41 to reduce the tensile load applied to the plastically deformed portion 34 compared to the plastically deformed portion 33 of Embodiment 1. Therefore, it is possible to prevent the plastically deformed portion 34 from developing holes.

[0044] Furthermore, the adhesive layer 41, like the adhesive layer 4 in Embodiment 1, can distribute the tensile load applied to the seal layer 5 via the plastically deformed portion 34. This makes it difficult for the seal layer 5 to peel off the tab 2.

[0045] As described above, in this second embodiment, in addition to the effects of the first embodiment, the tensile load applied to the plastically deformable portion 34 of the laminated outer casing 3 can be reduced compared to the tensile load applied to the plastically deformable portion 33 in the first embodiment. Therefore, it is possible to prevent holes from forming in the plastically deformable portion 34. Furthermore, the adhesive layer 41 can also distribute the tensile load applied to the seal layer 5 via the plastically deformable portion 34. This makes it difficult for the seal layer 5 to peel off from the tab 2. Therefore, the sealing performance of the laminated outer casing 3 is improved, making it difficult for oxygen and moisture to penetrate from the outside, and thus preventing deterioration of the all-solid-state battery cell 1.

[0046] (Embodiment 3) The bent portion 31 of the laminated casing 3 shown in Figure 5A has its end portion 35 facing the all-solid-state battery cell 1. In this case, the end portion 35 of the bent portion 31 may come into contact with the wiring 13 (first wiring 13a, second wiring 13b, third wiring 13c, fourth wiring 13d, fifth wiring 13e). The laminated casing 3 is, for example, a sheet formed by coating both sides of a sheet of metal material with insulating material. Therefore, if the end portion 35 comes into contact with the wiring 13, there is a risk that the internal metal of the laminated casing 3 may come into contact with the wiring 13. As shown in Figure 2A, the wiring 13 is connected to the first current collector foil 12a to the fifth current collector foil 12e inside the all-solid-state battery cell 1. Therefore, if the internal metal of the laminated casing 3 comes into contact with the wiring 13, the internal metal of the laminated casing 3 will become electrically connected to the first current collector foil 12a to the fifth current collector foil 12e in the all-solid-state battery cell 1 via the wiring 13, which may result in an internal short circuit in the all-solid-state battery cell 1.

[0047] Therefore, in this embodiment 3, the terminal portion 35 is oriented in the +X direction (towards the cell outer shell of the all-solid-state battery cell 1) so that it does not come into contact with the wiring 13. For example, as shown in Figure 5B, the terminal portion 35 of the laminate casing 3 is bent in the +X direction (towards the cell outer shell) and embedded in the adhesive layer 4. Also, as shown in Figure 5C, the bent portion 31 of the laminate casing 3 is bent twice (an even number of times) to orient the terminal portion 35 in the +X direction (towards the cell outer shell). This makes it possible to obtain an insulating space r between the terminal portion 35 and the wiring 13, thereby increasing the insulating distance. Furthermore, since the laminate casing 3 is a sheet covered with insulating material, even if the coated portion comes into contact with the wiring 13, it will not conduct electricity. Therefore, internal short circuits in the all-solid-state battery cell 1 can be prevented.

[0048] As described above, in this third embodiment, in addition to the effects of embodiments 1 and 2, by orienting the terminal portion 35 of the laminated outer casing 3 in the +X axis direction (towards the cell outer shell), it is possible to prevent internal short circuits in the all-solid-state battery cell 1. This improves the safety and quality of the all-solid-state battery cell 1.

[0049] (Embodiment 4) In embodiments 1 to 3, as shown in Figure 6A, the width of the adhesive layer 4 and the width of the seal layer 5 (dimension in the X-axis direction) were set to be the same. In this configuration, the tensile load generated by the expansion and contraction of the all-solid-state battery cell 1 is applied to the -X-axis end of the adhesive layer 4. The tensile load applied to the end of the adhesive layer 4 is input in series to the -X-axis end of the seal layer 5. As a result, the tensile load is concentrated on the end of the seal layer 5 (within the dashed-dotted frame). Therefore, the seal layer 5 becomes more likely to peel off from the tab 2.

[0050] Therefore, in this fourth embodiment, as shown in Figure 6B, the dimension (width) of the adhesive layer 4A in the X-axis direction is made shorter than the dimension of the seal layer 5 in the X-axis direction. Specifically, the end of the adhesive layer 4A on the -X-axis side (towards the cell enclosure direction) is positioned so that it is in the central part of the seal layer 5. As a result, the tensile load applied to the end of the adhesive layer 4A on the -X-axis side is applied to the central part of the seal layer 5. Therefore, the applied tensile load can be distributed throughout the entire seal layer 5, making it difficult for the seal layer 5 to peel off the tab 2. The same applies to the other bent portions 31 of the first laminate exterior 3a and the second laminate exterior 3b.

[0051] As described above, in this embodiment 4, in addition to the effects of embodiments 1 to 3, by making the width of the adhesive layer 4A smaller than the width of the seal layer 5 in the X-axis direction, the tensile load applied to the seal layer 5 can be distributed. This makes it difficult for the seal layer 5 to peel off from the tab 2. Therefore, the sealing performance of the laminate exterior 3 is improved, and it becomes difficult for oxygen and moisture to penetrate from the outside. As a result, the deterioration of the all-solid-state battery cell 1 can be prevented.

[0052] (Embodiment 5) In Embodiments 1 to 4, both sides in the width direction of the adhesive layers 4 and 4A have a flat shape. In such a configuration, stress tends to concentrate at the connection point between the width direction end of the adhesive layers 4 and 4A and the bent portion 31, and this stress concentration point may become the starting point of a crack. Therefore, in Embodiment 5, a configuration that makes it difficult for stress to concentrate will be described.

[0053] Hereinafter, the first bent portion 31a of the first laminate exterior 3a will be described as an example (reference numerals are used generically). The adhesive layer 4B shown in FIG. 7A includes a cell inner contour side end portion 42 as an end portion on the -X axis direction side and a cell outer shell side end portion 43 as an end portion on the +X axis direction side. The cell outer shell side end portion 43 has a concave shape that is recessed toward the -X axis direction side (cell inner contour side). Further, the cell inner contour side end portion 42 has a concave shape that is recessed toward the +X axis direction side (cell outer shell direction side). Therefore, the adhesive layer 4B forms concave shapes that are recessed inward of the adhesive layer 4B at both end portions in the width direction. The X-axis direction is a direction orthogonal to the ±Z-axis directions, which are the input directions of the tensile loads generated by the expansion and contraction of the all-solid-state battery cell 1.

[0054] The cell inner contour side end portion 42 includes a first adhesive end portion 44a and a second adhesive end portion 44b. The adhesive end portion means the end portion of the adhered portion. The first adhesive end portion 44a and the second adhesive end portion 44b are generically referred to as the adhesive end portion 44. The first adhesive end portion 44a is the adhesive end portion 44 of the adhesive layer 4B that is adhered to the laminate exterior 3 on the seal layer 5 side. The second adhesive end portion 44b is the adhesive end portion 44 of the adhesive layer 4B that is adhered to the laminate exterior 3 on the opposite side of the seal layer 5.

[0055] The most recessed position (the most +X axis direction side position) of the concave shape of the cell inner contour side end portion 42 is position E １ Let it be, the position of the first adhesive end portion 44a is position E ２ Let it be, and the position of the second adhesive end portion 44b is position E ３ Let it be. From position E １ to position E ２ the distance r ｅ１ and from position E １ to position E ３ the distance r ｅ２ have the relationship that the distance r ｅ１ < the distance r ｅ２ That is, the distance between the most recessed position (the most recessed +X axis direction side position) E １ of the concave shape of the cell inner contour side end portion 42 and the first adhesive end portion 44a is greater than the distance between position E １The distance between the first bent portion 31a and the second adhesive end portion 44b is longer. In this shape, when a tensile load is applied to the first bent portion 31a, the load is applied along the concave surface from the second adhesive end portion 44b toward the first adhesive end portion 44a. Therefore, the load is easily distributed within the adhesive layer 4B. Consequently, the load is less likely to concentrate in a part of the adhesive layer 4B. Therefore, it is less likely that a crack initiation point will occur in the adhesive layer 4B.

[0056] In Figure 7B, the cell outer shell end 43 has a linear and flat shape, rather than a concave shape in the -X axis direction. In this shape, the cell outer shell end 43 is prone to concentrated tensile loads in the central part of the adhesive layer 4B as the laminate outer shell 3 expands and contracts, and the central part of the adhesive layer 4B may become the starting point for cracks.

[0057] Furthermore, in Figures 7A and 7B, if the shape of the cell inner end 42 is convex toward the -X axis direction (cell inner end), a valley shape may form between the base of the convex shape and the bent portion 31. In this case, the load input may concentrate in the valley-shaped portion, potentially creating a crack initiation point. The same applies if the shape of the cell outer end 43 is convex toward the +X axis direction (cell outer end direction). The same also applies to the other bent portions 31 of the first laminate outer casing 3a and the second laminate outer casing 3b.

[0058] As described above, in addition to the effects of embodiments 1 to 4, embodiment 5 has the effect of making it difficult for cracks to occur in the adhesive layer 4B due to the expansion and contraction of the all-solid-state battery cell 1 by forming a concave shape toward the center of the adhesive layer 4B on both end faces of the adhesive layer 4B. As a result, cracks are less likely to occur in the adhesive layer 4B, improving the sealing performance of the laminate outer casing 3 and making it difficult for oxygen and moisture to penetrate from the outside. Therefore, deterioration of the all-solid-state battery cell 1 can be prevented.

[0059] (Embodiment 6) In this embodiment 6, the desirable shape and material of the adhesive layer 4 and the sealing layer 5 in the Z-axis direction (thickness) will be described below with reference to Figure 8.

[0060] In the following explanation, the first bent portion 31a of the first laminate outer casing 3a will be used as an example (generic symbols will be used). The tensile load associated with the expansion and contraction of the all-solid-state battery cell 1 increases the closer it is to the all-solid-state battery cell 1. Therefore, a greater tensile load is applied to the inner casing portion of the adhesive layer 4 that is closer to the all-solid-state battery cell 1 than to the outer casing portion. Since the tensile load applied to the adhesive layer 4 is also applied to the seal layer 5, if a large tensile load is applied to a part of the adhesive layer 4, a larger load will be applied to a part of the seal layer 5 than to other parts, and as a result, that part will be more likely to peel off. For this reason, it is desirable to ensure that the tensile load is applied evenly to the entire adhesive layer 4. Therefore, the thickness T of the inner casing portion of the adhesive layer 4 where the applied tensile load is large Ａ The thickness T of the outer shell portion Ｂ The thickness is increased. This allows the load on the adhesive layer 4 to be distributed more evenly, reducing the load gradient. As a result, the load on the sealing layer 5 can be made uniform.

[0061] Furthermore, it is desirable that the adhesive layer 4 be formed from an adhesive with a lower elastic modulus and greater elongation (ability to absorb elongation) than the adhesive material used in the sealing layer 5. This allows the thickness of the adhesive layer 4 to be considered as the spring length. The desired elasticity can be determined in advance through experiments, and the composition of the adhesive can be adjusted to achieve that elasticity.

[0062] Thickness T of the sealing layer 5 Ｃ If the thickness T of the seal layer 5 is large, it becomes stronger against tensile loads, but the amount of gas passing through the seal layer 5 increases. For this reason, the thickness T of the seal layer 5 Ｃ From the standpoint of suppressing gas permeation, it is desirable to reduce the amount of gas permeation and thereby reduce the tensile load applied to the seal layer 5.

[0063] As described above, by forming the adhesive layer 4 with an adhesive with a low elastic modulus, the tensile load applied to the bent portion 31 can be absorbed by the expansion and contraction of the adhesive layer 4. Therefore, the thickness T of the seal layer Ｃ <Thickness T on the outer shell side> Ｂ It is desirable to do so.

[0064] This reduces the tensile load on the seal layer 5, preventing the seal layer 5 from peeling off the tab 2 and the bent portion 31. The same applies to the other bent portions 31 of the first laminate outer casing 3a and the second laminate outer casing 3b.

[0065] As described above, in addition to the effects of embodiments 1 to 5, embodiment 6 makes it more difficult for the seal layer 5 to peel off from the tab 2 and the bent portion 31 by defining the shape of the adhesive layer 4 and the seal layer 5 in the Z-axis direction (thickness) and the type of adhesive used. Therefore, the sealing performance of the laminate outer casing 3 is improved, making it difficult for oxygen and moisture to penetrate from the outside, and thus preventing deterioration of the all-solid-state battery cell 1.

[0066] (Embodiment 7) In Embodiments 1 to 6, the seal layer 5 is composed of multiple seal layers in the circumferential direction, namely the first seal layer 5a to the fourth seal layer 5d and the ninth seal layer 5i to the twelfth seal layer 5l. In Embodiment 7, the circumferential seal layer 5 is composed of a single seal layer that extends around the entire circumference of the bent portion 31. The configuration of the all-solid-state battery 100A of Embodiment 7 is shown in Figures 9A and 9B. Figure 9B is a cross-sectional view taken along the line D-D' shown in Figure 9A. The first laminate outer casing 3a is provided with a first full-circumferential seal layer 51 that extends around the entire circumference of the bent portion 31. Note that the first full-circumferential seal layer 51 is located below the bent portion 31 and is therefore normally hidden by the bent portion 31 when viewed from the height direction (+Z axis direction) of the all-solid-state battery 100A. However, in Figure 9A, the hatching indicating the bent portion 31 has been removed from the first full-circumferential seal layer 51 for ease of understanding. Furthermore, the second laminate outer casing 3b is provided with a second full-circumference sealing layer 52 that extends around the entire circumference of the folded portion 31.

[0067] The first full-circumference sealing layer 51 and the second full-circumference sealing layer 52 are bonded to each other. As a result, the folded portion 31 of the first laminate outer casing 3a and the folded portion 31 of the second laminate outer casing 3b are bonded together around their entire circumference. Therefore, the sealing performance in the areas without tabs 2 is improved.

[0068] As described above, in addition to the effects of embodiments 1 to 6, embodiment 7 has the effect of improving the sealing performance of the portion without the tab 2 by bonding the entire circumference of the folded portion 31 with the first full-circumference sealing layer 51 and the second full-circumference sealing layer 52. Therefore, the sealing performance of the laminate outer casing 3 is improved, making it difficult for oxygen and moisture to penetrate from the outside, and thus preventing deterioration of the all-solid-state battery cell 1.

[0069] (Embodiment 8) In this embodiment 8, it is possible to visually determine whether or not the inside of the laminate casing 3 of the all-solid-state battery 100B is under vacuum. As shown in Figure 10A, in the all-solid-state battery 100B of this embodiment 8, the first folded portion 31a is provided with a first adhesive layer 45a. The second folded portion 31b is provided with a second adhesive layer 45b. The third folded portion 31c is provided with a third adhesive layer 45c. The fourth folded portion 31d is provided with a fourth adhesive layer 45d.

[0070] A portion of the first adhesive layer 45a and the second adhesive layer 45b are cut out to form a passage 46 that penetrates between them. Furthermore, the first laminate outer casing 3a is provided with a projection 6 that is connected to the passage 46, has a hollow interior, and partially protrudes toward the outer shell.

[0071] Figure 10B is an enlarged view of the area enclosed by the dashed line frame in Figure 10A. Figure 10C is a cross-sectional view taken along the line E-E' in Figure 10B. The projection 6 has a hollow projection space 61. The projection space 61 is connected to the passage 46. As a result, the projection space 61 is connected to the inside of the all-solid-state battery 100B in which the all-solid-state battery cell 1 is arranged, via the passage 46.

[0072] The protrusion 6 collapses due to the external pressure when the inside of the solid-state battery 100B is evacuated. Therefore, an operator can determine from the appearance of the solid-state battery 100B that the inside of the solid-state battery 100B is evacuated. Conversely, if the protrusion space 61 of the protrusion 6 does not collapse even when the vacuum is applied, an operator can determine from the appearance of the protrusion 6 that the inside of the solid-state battery 100B is not evacuated.

[0073] Furthermore, if gas is generated during charging and discharging of the all-solid-state battery cell 1, or if a hole occurs in the laminated outer casing 3, gas or air will accumulate in the protruding space 61 of the crushed protrusion 6, causing it to expand. Therefore, the shape of the protrusion 6 can be used to determine whether gas has been generated inside the laminated outer casing 3, whether a hole has been formed in the laminated outer casing 3, etc.

[0074] Furthermore, if the space 61 inside the projection 6 becomes a vacuum and collapses, the laminate casing 3 will undergo plastic deformation. The tensile load on the projection 6 due to the expansion and contraction associated with the charging and discharging of the all-solid-state battery cell 1 can be absorbed by the adhesive layer 45 before it reaches the projection 6. Therefore, the projection 6 will not develop a hole. The positions where the passage 46 and the projection 6 are formed are arbitrary. For example, a passage may be formed in the sixth adhesive layer 4f shown in Figure 10C, and a projection having a cavity communicating with this passage may be formed on the second laminate casing 3b. Also, the projection 6 may be formed not only on the corners of the all-solid-state battery 100B, but also on flat parts, etc.

[0075] As described above, in addition to the effects of embodiments 1 to 7, embodiment 8 has the effect of allowing determination of whether or not the inside of the all-solid-state battery 100B is vacuumed based on the shape of the projection 6 that is visible from the outside. This makes it easy to check the initial quality of the all-solid-state battery 100B from its appearance and improves the yield. Furthermore, the shape of the projection 6 allows for the determination of gas generation inside the laminated casing 3 and the presence of holes in the laminated casing 3. This makes it easy to determine any abnormalities in the all-solid-state battery 100B from its appearance.

[0076] (Modifications) In Embodiment 8, a passage 46 is provided at one location between the first adhesive layer 45a and the second adhesive layer 45b, but the invention is not limited to this, and there may be multiple passages 46. Also, although the projection space 61 of the projection 6 is provided at one location, there may be multiple projection spaces 61. Furthermore, the projection space 61 of the projection 6 may be elliptical, rectangular, or any other shape. In addition, the combination of Embodiments 1 to 8 is arbitrary, and some embodiments may be combined. For example, Embodiments 1 to 3 may be combined to form the configuration shown in Figure 5C. Also, Embodiments 1, 5, and 6 may be combined to form the configuration shown in Figure 7A. Furthermore, Embodiment 8 can be combined with any combination of Embodiments 1 to 7. In addition, the shape, material, size, etc. of the laminate casing 3 and the power generation element 11 are not limited to the embodiments, and may be any shape, material, size, etc.

[0077] The present invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the invention is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of disclosure are considered to be within the scope of the invention.

[0078] The present invention can be suitably used in all-solid-state batteries.

[0079] 1 All solid battery cell, 2 Tab, 2a Positive electrode tab, 2b Negative electrode tab, 3 Laminated exterior body, 3a First laminated exterior body, 3b Second laminated exterior body, 4, 4A, 4B Adhesive layer, 4a, 41a First adhesive layer, 4b, 41b Second adhesive layer, 4c, 41c Third adhesive layer, 4d Fourth adhesive layer, 4e 5th adhesive layer, 4f 6th adhesive layer, 4g 7th adhesive layer, 4h 8th adhesive layer, 4s Space, 5 sealing layer, 5a 1st sealing layer, 5b 2nd sealing layer, 5c 3rd sealing layer, 5d 4th sealing layer, 5e 5th sealing layer, 5f 6th sealing layer, 5g 7th sealing layer, 5h 8th sealing layer, 5i 9th sealing layer, 5j 10th sealing layer, 5k 11th seal layer, 5l 12th seal layer, 5m 13th sealing layer, 5n 14th sealing layer, 5o 15th sealing layer, 5p 16th sealing layer, 6 Protrusion, 11 Power generation element, 11a First positive electrode element, 11b First negative electrode element, 11c Second positive electrode element, 11d Second negative electrode element, 11e Third positive electrode element, 11f Third negative electrode element, 11g Fourth positive electrode element, 11h Fourth negative electrode element, 12 Current collector foil, 12a First current collector foil, 12b Second current collector foil, 12c Third current collector foil, 12d Fourth current collector foil, 12e Fifth current collector foil, 13 Wiring, 13a First wiring, 13b Second wiring, 13c Third wiring, 13d Fourth wiring, 13e Fifth wiring, 31, 31A Folded section, 31a First folded section, 31b Second folded section, 31c Third folded section, 31d 4th bend, 31e 5th bend, 31f 6th bend, 31g 7th bend, 31h 8th bend, 32 Joint, 32a 1st joint, 32b 2nd joint, 32c 3rd joint, 32d 4th joint, 32e 5th joint, 32f 6th joint, 32g 7th joint, 32h 8th joint, 32i 9th joint, 32j 10th joint, 32k 11th joint, 32l 12th joint, 33 Plastic deformation, 33a, 34a 1st plastic deformation, 33b, 34b 2nd plastic deformation, 33c,34c Third plastic deformation part, 33d Fourth plastic deformation part, 33e Fifth plastic deformation part, 33f Sixth plastic deformation part, 33g Seventh plastic deformation part, 33h Eighth plastic deformation part, 34 Plastic deformation part, 35 End part, 42 Cell inner shell side end, 43 Cell outer shell side end, 44 Adhesive end, 44a First adhesive end, 44b Second adhesive end, 45 Adhesive layer, 45a First adhesive layer, 45b Second adhesive layer, 45c Third adhesive layer, 45d Fourth adhesive layer, 46 Passage, 51 First full-circumference seal layer, 52 Second full-circumference seal layer, 61 Protruding space, 100, 100A, 100B All-solid-state battery, E, １ , E ２ Position, r; Insulated space, r ｅ１ ,r ｅ２ distance, T Ａ , T Ｂ , T Ｃ Thickness.

Claims

A solid-state battery cell having two opposing main surfaces and a side surface connecting both main surfaces, A tab connected to the all-solid-state battery cell for drawing power from the all-solid-state battery cell, A solid-state battery comprising the all-solid-state battery cell and a laminated outer casing that encloses the base end of the tab, The laminated outer casing comprises insulating and flexible sheets laminated on both main surfaces of the all-solid-state battery cell, Each sheet has a folded portion at the edge that has been folded back at least once. The bent portion has a convex shape toward the cell outer shell of the all-solid-state battery cell, The bent portion is arranged along the outer surface of the all-solid-state battery cell, The aforementioned folded portion has a joining portion that connects with the tab or an adjacent folded portion. The adhesive layer located inside the convex shape of the bent portion is formed by an elastic adhesive member. All-solid-state battery. 　 The aforementioned folded portion is formed by folding the sheet of the laminated outer casing one or more times. The all-solid-state battery according to claim 1. 　 The bent portion is such that the end of the laminated outer casing faces the cell shell of the all-solid-state battery cell. The all-solid-state battery according to claim 1 or 2. 　 The adhesive layer has a width smaller than the width of the sealing layer that adheres the bent portion and the tab. The all-solid-state battery according to claim 1 or 2. 　 The end face of the adhesive layer is perpendicular to the direction of load input due to the expansion and contraction of the all-solid-state battery cell, and has a concave shape toward the inside of the adhesive layer, with the end of the end face away from the seal layer having a longer dimension in the X direction than the end of the end face closer to the seal layer. The all-solid-state battery according to claim 1 or 2. 　 The thickness of the adhesive layer is greater than the thickness of the seal layer. The all-solid-state battery according to claim 1 or 2. 　 The aforementioned folded portion has a sealing layer provided around its entire circumference. The all-solid-state battery according to claim 1 or 2. 　 The adhesive layer has an opening that penetrates at least one location. The bent portion is provided with a projection at least at one location in the direction of the cell outer shell of the all-solid-state battery cell. The aforementioned protrusion is hollow inside. The all-solid-state battery according to claim 1 or 7.

Images