Battery, laminated battery, and method for manufacturing the same

Abstract

A battery includes an electrode layer, an opposite electrode layer disposed opposite the electrode layer, and a solid electrolyte layer between the electrode layer and the opposite electrode layer. The electrode layer includes an electrode current collector, an electrode active material layer between the electrode current collector and the solid electrolyte layer, and an electrode-side insulating layer between the electrode current collector and the electrode active material layer at an end portion of the electrode layer. The opposite electrode layer includes an opposite electrode current collector, an opposite electrode active material layer between the opposite electrode current collector and the solid electrolyte layer, and an opposite electrode-side insulating layer between the opposite electrode current collector and the opposite electrode active material layer at an end portion of the opposite electrode layer. In a plan view, a length of the electrode-side insulating layer in a direction from an outer periphery of the battery toward a center portion is greater than a length of the opposite electrode-side insulating layer in the direction from the outer periphery of the battery toward the center portion.

Description

Technical Field

[0001] This disclosure relates to batteries, stacked batteries, and methods for manufacturing the same. Background Technology

[0002] Battery having insulating components is disclosed in Patent Document 1 and Patent Document 2.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2012 / 164642

[0006] Patent Document 2: Japanese Patent Application Publication No. 2016-207286 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the prior art, there is a pursuit of improving battery reliability. Therefore, the purpose of this disclosure is to provide batteries with high reliability.

[0009] Methods for solving problems

[0010] One aspect of this disclosure relates to a battery comprising an electrode layer, a counter electrode layer disposed opposite to the electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer. The electrode layer has an electrode current collector, an electrode active material layer located between the electrode current collector and the solid electrolyte layer, and an electrode-side insulating layer located at the end of the electrode layer between the electrode current collector and the electrode active material layer. The counter electrode layer has a counter electrode current collector, a counter electrode active material layer located between the counter electrode current collector and the solid electrolyte layer, and a counter electrode-side insulating layer located at the end of the counter electrode layer between the counter electrode current collector and the counter electrode active material layer. When viewed in a planar manner, the length of the electrode-side insulating layer in the direction from the outer periphery of the battery toward the center is greater than the length of the counter electrode-side insulating layer in the direction from the outer periphery of the battery toward the center.

[0011] One aspect of this disclosure relates to a stacked battery comprising a plurality of the aforementioned batteries, wherein the plurality of batteries are stacked.

[0012] One aspect of this disclosure relates to a battery manufacturing method comprising: an insulating layer stacking process, wherein a first insulating layer is stacked on a portion of at least one side of a first current collector; a power generation element stacking process, wherein a power generation element portion, formed by sequentially stacking an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer in this order, and the first current collector having the first insulating layer formed thereon are stacked such that the electrode active material layer is covered by the first insulating layer; and a current collector stacking process, wherein a second insulating layer is stacked on the side of the power generation element portion opposite to the side of the first current collector. The second current collector is stacked on the power generation element in such a way that the second insulating layer is sandwiched between the active material layer of the counter electrode of the power generation element and the second current collector, and the first insulating layer and the second insulating layer are located at an overlapping position when viewed in a plane; and a cutting process is performed to cut the first current collector, on which the first insulating layer, the power generation element, the second insulating layer and the second current collector are stacked, at the position where the first insulating layer and the second insulating layer are separated.

[0013] Invention Effects

[0014] According to this disclosure, it is possible to provide highly reliable batteries, etc. Attached Figure Description

[0015] Figure 1 This is a schematic top view showing an example of the battery involved in Embodiment 1.

[0016] Figure 2 yes Figure 1 A sectional view at the location shown by line II-II.

[0017] Figure 3 This is a schematic cross-sectional view showing an example of the battery involved in the comparative example.

[0018] Figure 4 This is a schematic cross-sectional view showing other examples of batteries involved in the comparative example.

[0019] Figure 5 This is a flowchart illustrating the battery manufacturing method according to Embodiment 1.

[0020] Figure 6A This is a schematic diagram illustrating an example of a current collector with a stacked insulating layer according to Embodiment 1.

[0021] Figure 6B This is a schematic diagram illustrating another example of a current collector with a stacked insulating layer according to Embodiment 1.

[0022] Figure 6C This is a schematic diagram illustrating another example of a current collector with a stacked insulating layer according to Embodiment 1.

[0023] Figure 7A This is a schematic cross-sectional view showing an example of a laminated electrode plate according to Embodiment 1.

[0024] Figure 7B This is a schematic cross-sectional view showing another example of the laminated electrode plate involved in Embodiment 1.

[0025] Figure 7C This is a schematic cross-sectional view showing another example of the laminated electrode plate involved in Embodiment 1.

[0026] Figure 8 This is a diagram illustrating the current collector stacking process and the cutting process in the battery manufacturing method according to Embodiment 1.

[0027] Figure 9 This is a schematic cross-sectional view showing an example of a battery involved in a variation of embodiment 1.

[0028] Figure 10 This is a diagram illustrating the cutting process in the battery manufacturing method according to a variation 1 of Embodiment 1.

[0029] Figure 11 This is a schematic top view showing an example of a battery involved in a variation 2 of embodiment 1.

[0030] Figure 12 This is a schematic side view showing an example of a battery involved in a variation 2 of embodiment 1.

[0031] Figure 13 This is a schematic cross-sectional view showing an example of a battery involved in a variation 3 of embodiment 1.

[0032] Figure 14 This is a schematic cross-sectional view showing an example of a stacked battery according to Embodiment 2.

[0033] Figure 15 This is a schematic cross-sectional view illustrating another example of the stacked battery involved in Embodiment 2.

[0034] Figure 16 This is a flowchart illustrating the manufacturing method of the stacked battery according to Embodiment 2.

[0035] Figure 17 This is a schematic cross-sectional view showing an example of a stacked electrode plate according to Embodiment 2.

[0036] Figure 18 This diagram illustrates the processes following the first laminate stacking step in the manufacturing method of the laminated battery according to Embodiment 2.

[0037] Figure 19This is a schematic cross-sectional view showing an example of a laminated electrode plate involved in a variation of Embodiment 2, Example 1.

[0038] Figure 20 This is a schematic cross-sectional view showing other examples of the laminated electrode plate involved in variation 1 of embodiment 2.

[0039] Figure 21 This is a schematic cross-sectional view showing an example of a multilayer electrode plate involved in a variation of Embodiment 2, Example 1.

[0040] Figure 22 This is a schematic cross-sectional view showing an example of a stacked battery involved in a variation of Embodiment 2, Example 1.

[0041] Figure 23 This is a schematic cross-sectional view showing an example of a stacked battery according to Embodiment 3.

[0042] Figure 24 This is a schematic cross-sectional view illustrating another example of the stacked battery involved in Embodiment 3.

[0043] Figure 25 This is a schematic cross-sectional view showing yet another example of the stacked battery according to Embodiment 3. Detailed Implementation

[0044] (These insights form the basis of this disclosure)

[0045] In all-solid-state batteries and similar batteries that have a solid electrolyte layer containing a solid electrolyte, terminals are sometimes formed at the ends of the battery to extract current. In particular, when batteries are stacked, forming terminals on the sides of the battery avoids forming terminals that do not contribute to the battery's capacity in the thickness direction, which has a significant impact on the battery's capacity, thus improving the battery's energy density. On the other hand, when terminals for electrical connection with a current collector are formed on the sides of the battery, it can be difficult to form the terminals due to the surface energy of the current collector. Furthermore, because the current collector is thin, it is difficult to determine the location of the terminals, leading to misalignment of the terminal formation. This can potentially decrease the reliability of the battery due to poor terminal formation.

[0046] In addition, the ends of the current collector in the battery are easy to peel off. If the current collector peels off, the active material layer is exposed, and the active material is easy to fall off, which reduces the reliability of the battery.

[0047] Therefore, this disclosure provides a battery with high reliability. In particular, this disclosure provides a battery that can improve energy density while maintaining high reliability.

[0048] The following is a summary of one of the solutions disclosed herein.

[0049] One aspect of this disclosure relates to a battery comprising an electrode layer, a counter electrode layer disposed opposite to the electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer. The electrode layer has an electrode current collector, an electrode active material layer located between the electrode current collector and the solid electrolyte layer, and an electrode-side insulating layer located at the end of the electrode layer between the electrode current collector and the electrode active material layer. The counter electrode layer has a counter electrode current collector, a counter electrode active material layer located between the counter electrode current collector and the solid electrolyte layer, and a counter electrode-side insulating layer located at the end of the counter electrode layer between the counter electrode current collector and the counter electrode active material layer. When viewed in a planar manner, the length of the electrode-side insulating layer in the direction from the outer periphery of the battery toward the center is greater than the length of the counter electrode-side insulating layer in the direction from the outer periphery of the battery toward the center.

[0050] Therefore, at the end of the electrode layer, there is a region where the electrode current collector, electrode-side insulating layer, and electrode active material layer are stacked sequentially in this order. Similarly, at the end of the counter electrode layer, there is a region where the counter electrode current collector, counter electrode-side insulating layer, and counter electrode active material layer are stacked sequentially in this order. Thus, at the ends of the electrode current collector and counter electrode current collector, where peeling is likely to occur, even if the electrode current collector and counter electrode current collector peel off, exposure of the electrode active material layer and counter electrode active material layer is suppressed, reducing the likelihood of damage or short circuits caused by contact between the electrode active material layer and counter electrode active material layer and other components. Furthermore, even when the electrode current collector is easier to peel than the counter electrode current collector, the longer length of the electrode-side insulating layer effectively protects the electrode active material layer. Additionally, even when terminals for current extraction are formed on the sides of the electrode current collector and counter electrode current collector, the electrode-side insulating layer and counter electrode-side insulating layer serve as markers, making the location of the terminals easily identifiable. Furthermore, even when using materials such as conductive resins to form the terminals, the wettability of the material is improved through the electrode-side insulating layer and the counter-electrode-side insulating layer, making terminal formation easier. Therefore, short circuits and poor connections caused by poor terminal formation can be suppressed. This improves battery reliability.

[0051] Alternatively, for example, the side surface of the electrode-side insulating layer and the side surface of the electrode current collector may be coplanar, and the side surface of the counter electrode-side insulating layer and the side surface of the counter electrode current collector may be coplanar.

[0052] Therefore, since the side surfaces of the electrode-side insulating layer and the electrode current collector are coplanar, and the side surfaces of the counter-electrode-side insulating layer and the counter-electrode current collector are also coplanar, the areas of the electrode-side insulating layer and the counter-electrode-side insulating layer can be easily adjusted to manufacture the battery by cutting off both the electrode-side insulating layer and the electrode current collector together. Consequently, due to the presence of the electrode-side insulating layer and the counter-electrode-side insulating layer, electron transfer between the electrode active material layer and the electrode current collector, as well as between the counter-electrode active material layer and the counter-electrode current collector, is suppressed, creating regions where the electrode active material layer and the counter-electrode active material layer cannot function as electrodes. However, by adjusting the areas of the electrode-side insulating layer and the counter-electrode-side insulating layer, these regions can be minimized. This improves the volumetric energy density of the battery. Furthermore, since the sides are coplanar, terminals for extracting current to the outside can be easily formed. In addition, compared with the case where the electrode current collector and counter electrode current collector are extended and used as terminals, the area that does not function as a battery is not easily increased, which can improve the volumetric energy density of the battery.

[0053] Alternatively, for example, the thickness of the electrode-side insulating layer may be more than half the thickness of the electrode current collector, and the thickness of the counter electrode-side insulating layer may be more than half the thickness of the counter electrode current collector.

[0054] Therefore, even when terminals are formed as described above, the location of the terminals is easier to identify. Furthermore, by making the electrode-side insulating layer and the counter-electrode-side insulating layer thicker, even when terminals are formed using materials such as conductive resins, the wettability of the material is further improved through the electrode-side insulating layer and the counter-electrode-side insulating layer.

[0055] Alternatively, for example, the electrode layer may be a positive electrode layer and the counter electrode layer may be a negative electrode layer.

[0056] Therefore, when viewed in a planar manner, the area where the electrode active material layer and the electrode-side insulating layer overlap and are difficult to function as a positive electrode is larger than the area where the counter electrode active material layer and the counter electrode-side insulating layer overlap and are difficult to function as a negative electrode. Consequently, the capacity of the negative electrode active material layer is more likely to be larger than that of the positive electrode active material layer. Therefore, the deposition of metals originating from metal ions that have not been incorporated into the negative electrode active material layer is suppressed, which can further improve the reliability of the battery.

[0057] Alternatively, for example, when viewed in a plane, the length of the electrode-side insulating layer in the direction from the outer periphery of the battery toward the center is the same as the length of the counter-electrode-side insulating layer in the direction from the outer periphery of the battery toward the center.

[0058] Therefore, since the electrode-side insulating layer and the counter-electrode-side insulating layer have the same length, the battery can be easily manufactured.

[0059] Alternatively, for example, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer may comprise a resin.

[0060] Therefore, by means of the anchoring effect of the resin contained in at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer into the current collector and the active material layer, the bonding between at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer and the current collector and the active material layer can be improved, and the peeling of at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer from the current collector and the active material layer can be suppressed.

[0061] Alternatively, for example, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer may comprise a metal oxide.

[0062] As a result, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer becomes hardened. Therefore, even if at least one insulating layer is formed thin during battery manufacturing, at least one insulating layer is not easily deformed when stacked with other layers, and at least one insulating layer with a uniform thickness can be formed.

[0063] Alternatively, for example, the electrode-side insulating layer and the counter-electrode-side insulating layer may be made of the same material.

[0064] Therefore, it is not necessary to use different materials in the electrode-side insulating layer and the counter electrode-side insulating layer, making it easy to manufacture batteries.

[0065] Alternatively, for example, when viewed in a plane, the length of each of the electrode-side insulating layer and the counter electrode-side insulating layer in the direction from the outer periphery of the battery toward the center is less than 1 mm.

[0066] Therefore, the regions where the electrode active material layer and the counter electrode active material layer cannot function as electrodes due to the presence of electrode-side insulating layer and counter electrode-side insulating layer can be reduced to a range of a certain length or less, thereby improving the volumetric energy density of the battery.

[0067] Alternatively, for example, the thickness of at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer may be 5 μm or more.

[0068] As a result, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer becomes thicker. Therefore, even when terminals for extracting current are formed on the sides of the electrode current collector and the counter-electrode current collector, the effect of easily identifying the terminal formation location and the effect of easily forming the terminal can be improved.

[0069] Alternatively, for example, the solid electrolyte layer, the electrode current collector, the electrode active material layer, the electrode side insulating layer, the counter electrode current collector, the counter electrode active material layer, and the counter electrode side insulating layer may each have their sides exposed.

[0070] Therefore, the layers that contribute to the battery's charge and discharge performance are present at the battery's ends. Consequently, the battery's volumetric energy density can be improved.

[0071] Alternatively, for example, the side surface of the electrode layer, the side surface of the counter electrode layer, and the side surface of the solid electrolyte layer may be coplanar.

[0072] Therefore, there are no steps or unevenness on the sides of each layer of the battery. Consequently, there are no spaces that would not contribute to the battery's charge and discharge performance due to unevenness, thus suppressing a substantial decrease in the battery's energy density. This, in turn, improves the battery's volumetric energy density.

[0073] Alternatively, for example, when viewed in a plane, the electrode active material layer and the counter electrode active material layer may have the same shape and position.

[0074] This reduces the capacity difference between the counter electrode active material layer and the electrode active material layer, thus maximizing the capacity of either the counter electrode active material layer or the electrode active material layer.

[0075] Alternatively, for example, the side of the battery may be tilted relative to the stacking direction in a direction in which the area of ​​the counter electrode layer is larger than the area of ​​the electrode layer when viewed in a plane.

[0076] Therefore, the side surface of the solid electrolyte layer in the battery is also tilted relative to the stacking direction, thus making the side surface of the solid electrolyte layer larger compared to the case where the side surface is not tilted. As a result, the distance between the electrode layer and the counter electrode layer, which are separated by the solid electrolyte layer in the side surface of the battery, becomes longer. Consequently, the electrode layer and the counter electrode layer are less likely to make contact, and short circuits are suppressed.

[0077] Alternatively, for example, the side of the battery could be a cut surface.

[0078] Therefore, the side of the battery end is formed by cutting. By adjusting the area of ​​the electrode-side insulating layer and the counter-electrode-side insulating layer using the cutting position, the area of ​​the regions where the electrode active material layer and the counter-electrode active material layer cannot function as electrodes due to the presence of these insulating layers can be reduced, thereby increasing the volumetric energy density of the battery. Furthermore, since the side of the battery is a cut surface, it is easy to make the side surfaces of the electrode layer, the counter-electrode layer, and the solid electrolyte layer coplanar.

[0079] Alternatively, for example, the shape of the cut surface may be rectangular or trapezoidal.

[0080] Therefore, the ends of the cut surface are straight. Consequently, there is no space that would not contribute to the battery's charge / discharge performance due to the ends not being straight, thus suppressing a substantial decrease in the battery's energy density. This, in turn, improves the battery's energy density.

[0081] Alternatively, for example, the electrode-side insulating layer may be disposed on the outer periphery of the electrode layer and be frame-shaped when viewed in a plane, and the counter electrode-side insulating layer may be disposed on the outer periphery of the counter electrode layer and be frame-shaped when viewed in a plane.

[0082] Thus, the effect is achieved that an electrode-side insulating layer and a counter-electrode-side insulating layer are provided at any position on the outer periphery of the electrode layer and the counter-electrode layer respectively.

[0083] Alternatively, for example, the battery may have a rectangular shape when viewed in plan view, with the electrode-side insulating layer and the counter electrode-side insulating layer respectively arranged along two opposite sides of the rectangle when viewed in plan view.

[0084] Therefore, the electrode-side insulating layer and the counter electrode-side insulating layer are formed into strips that extend in one direction. Thus, when the electrode-side insulating layer and the counter electrode-side insulating layer are formed by coating or the like, the coating nozzle or the electrode current collector and the counter electrode current collector can be moved in only one direction, which can efficiently manufacture the battery.

[0085] Alternatively, for example, the solid electrolyte layer may contain a solid electrolyte that is lithium-ion conductive.

[0086] Therefore, in lithium-ion batteries containing solid electrolytes, the reliability of the battery can be improved.

[0087] In addition, one aspect of this disclosure relates to a stacked battery comprising a plurality of the aforementioned batteries, wherein the plurality of batteries are stacked.

[0088] Therefore, due to the aforementioned battery stacking, a stacked battery with high reliability can be achieved.

[0089] Alternatively, for example, the plurality of batteries may be stacked such that the electrode layers of adjacent batteries are adjacent to each other or the counter electrode layers are adjacent to each other, the stacked battery having electrode terminals connected to the side surfaces of the electrode current collectors and electrode-side insulating layers in the electrode layers, and counter electrode terminals connected to the side surfaces of the counter electrode current collectors and counter electrode-side insulating layers in the counter electrode layers.

[0090] Therefore, in a stacked battery that can be connected in parallel, the electrode terminals for extracting current from the electrode layers and the counter electrode terminals for extracting current from the counter electrode layers are respectively connected to the sides of the electrode current collector and the counter electrode current collector. Thus, there is no need to form so-called "blank spaces" for electrode current collectors and counter electrode current collectors for connection to leads or other connection terminals, thereby further improving the volumetric energy density of the stacked battery.

[0091] Furthermore, since the electrode current collector and counter electrode current collector are made of metal foil or the like, they have high surface energy and easily repel the materials of the electrode terminals and counter electrode terminals. The electrode-side insulating layer and counter electrode-side insulating layer contain, for example, resin, thus the wettability of the materials of the electrode terminals and counter electrode terminals is better than that of the electrode current collector and counter electrode current collector. Additionally, compared to the electrode active material layer and counter electrode active material layer formed by an active material mixture, the materials of the electrode terminals and counter electrode terminals are less likely to penetrate into the electrode-side insulating layer and counter electrode-side insulating layer. Therefore, electrode terminals and counter electrode terminals are easily formed in the regions including the sides of the electrode-side insulating layer and counter electrode-side insulating layer. Furthermore, if the thickness of the electrode current collector and counter electrode current collector is reduced to increase the volumetric energy density of the tandem battery, the positions of the sides of the electrode current collector and counter electrode current collector become difficult to identify. However, since the electrode-side insulating layer and counter electrode-side insulating layer are respectively stacked on the electrode current collector and counter electrode current collector, the positions of the sides of the electrode current collector and counter electrode current collector are easily identified. This allows for the suppression of short circuits caused by misalignment of the electrode terminals and counter electrode terminals. Consequently, when forming electrode terminals and counter electrode terminals in a tandem cell, it is possible to suppress defects in the formation of the electrode terminals and counter electrode terminals, resulting in a highly reliable tandem cell.

[0092] Furthermore, one aspect of this disclosure relates to a battery manufacturing method comprising: an insulating layer stacking process, wherein a first insulating layer is stacked on a portion of at least one side of a first current collector; a power generation element stacking process, wherein a power generation element portion, formed by sequentially stacking an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer in that order, is stacked with the first current collector having the first insulating layer formed thereon, such that the electrode active material layer is covered by the first insulating layer; and a current collector stacking process, wherein a second insulating layer is stacked on the side of the power generation element portion opposite to the side of the first current collector. The first insulating layer and the second current collector are stacked on the power generation element in such a way that the second insulating layer is sandwiched between the active material layer of the counter electrode of the power generation element and the second current collector, and the first insulating layer and the second insulating layer are located at an overlapping position when viewed in a plane; and a cutting process is performed to cut the first current collector, on which the first insulating layer, the power generation element, the second insulating layer and the second current collector are stacked, at the position where the first insulating layer and the second insulating layer are separated.

[0093] Therefore, at the end of the first current collector in the manufactured battery, the first current collector, the first insulating layer, and the electrode active material layer are stacked sequentially in this order. Similarly, at the end of the second current collector, the second current collector, the second insulating layer, and the counter electrode active material layer are stacked sequentially in this order. Thus, even if the first and second current collectors peel off at their ends, where peeling is likely to occur, only the first and second insulating layers are exposed, thereby suppressing exposure of the electrode active material layers and the counter electrode active material layers. Consequently, damage or short circuits caused by contact between the electrode active material layers and the counter electrode active material layers and other components are less likely to occur. This allows for the manufacture of a highly reliable battery.

[0094] The following is a reference to the appendix. Figure 1 The implementation method will be described in detail below.

[0095] It should be noted that the embodiments described below are all inclusive or specific examples. The values, shapes, materials, constituent elements, the arrangement of constituent elements, and connection methods shown in the following embodiments are examples and are not intended to limit this disclosure.

[0096] Furthermore, in this specification, terms such as parallel and coplanar, which indicate the relationship between elements, and terms such as flat and rectangular, which indicate the shape of elements, as well as numerical ranges, are not merely expressions with a strict meaning, but also imply and include substantially equivalent ranges, such as expressions with differences of about a few percent.

[0097] Furthermore, the figures are not necessarily strictly representational. In each figure, substantially identical components are labeled with the same reference numerals, and repeated descriptions are omitted or simplified.

[0098] In this specification and accompanying drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional orthogonal coordinate system. In each embodiment, the z-axis direction is defined as the stacking direction of the battery. Furthermore, the positive direction of the z-axis is defined as upward along the z-axis, and the negative direction is defined as downward along the z-axis. Also, in this specification, "planar observation" means observing the battery along the z-axis. Additionally, "thickness" in this specification refers to the length of each layer in the stacking direction. That is, the direction in which each layer is stacked is the thickness direction of that layer.

[0099] Furthermore, in this specification, the terms "above" and "below" in the context of battery configuration do not refer to the absolute spatial direction of upward (vertical above) and downward (vertical below), but are used as terms defined by relative positional relationships based on the stacking order in a layered configuration. Additionally, the terms "above" and "below" apply not only to cases where two components are arranged spaced apart from each other and other components exist between them, but also to cases where two components are arranged close together and connected.

[0100] (Implementation Method 1)

[0101] The battery according to Embodiment 1 will be described below. The battery according to Embodiment 1 is a single cell comprising one electrode active material layer and one counter electrode active material layer.

[0102] [constitute]

[0103] First, refer to the appendix Figure 1 The structure of the battery according to Embodiment 1 will be described below. Figure 1 This is a schematic top view illustrating an example of a battery involved in this embodiment. Figure 1 In the diagram, the planar shapes of the various components of the battery are shown by solid and dashed lines. Figure 2 yes Figure 1 A sectional view at the location shown by line II-II.

[0104] like Figure 1 and Figure 2 As shown, the battery 50 according to this embodiment includes an electrode layer 10, a counter electrode layer 20 disposed opposite to the electrode layer 10, and a solid electrolyte layer 30 located between the electrode layer 10 and the counter electrode layer 20. That is, the battery 50 has a structure in which the electrode layer 10, the solid electrolyte layer 30, and the counter electrode layer 20 are stacked sequentially in this order.

[0105] The electrode layer 10 has a current collector 11, an electrode active material layer 12 located between the current collector 11 and the solid electrolyte layer 30, and an insulating layer 13 located at the end of the electrode layer 10 between the current collector 11 and the electrode active material layer 12 when viewed in planar view. The current collector 11 and the electrode active material layer 12 have the same shape and position when viewed in planar view. The current collector 11 is an example of an electrode current collector, and the insulating layer 13 is an example of an electrode-side insulating layer.

[0106] The counter electrode layer 20 has a current collector 21, a counter electrode active material layer 22 located between the current collector 21 and the solid electrolyte layer 30, and an insulating layer 23 located at the end of the counter electrode layer 20 between the current collector 21 and the counter electrode active material layer 22 when viewed in planar view. The current collector 21 and the counter electrode active material layer 22 have the same shape and position when viewed in planar view. The current collector 21 is an example of a counter electrode current collector, and the insulating layer 23 is an example of an insulating layer on the counter electrode side.

[0107] Battery 50 is, for example, an all-solid-state battery. The sides of battery 50 are parallel to the stacking direction. Furthermore, the sides of battery 50 are flat planes. In other words, the sides of electrode layer 10, counter electrode layer 20, and solid electrolyte layer 30 are without steps and lie on the same flat plane. That is, the sides of electrode layer 10, counter electrode layer 20, and solid electrolyte layer 30 are coplanar. It should be noted that a side is a plane extending from the end of the main surface in a direction intersecting the main surface, when the plane perpendicular to the stacking direction is designated as the main surface among the constituent elements of battery 50. The planar shape of battery 50 is rectangular. Therefore, the planar shapes of electrode layer 10, counter electrode layer 20, and solid electrolyte layer 30 are rectangular.

[0108] Furthermore, at the end of electrode layer 10 in the direction perpendicular to the stacking direction, the side surfaces of insulating layer 13, electrode active material layer 12, and current collector 11 are coplanar. Similarly, at the end of counter electrode layer 20 in the direction perpendicular to the stacking direction, the side surfaces of insulating layer 23, counter electrode active material layer 22, and current collector 21 are coplanar. In other words, at the end of battery 50 in the direction perpendicular to the stacking direction, the side surfaces of current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21 are coplanar, forming a single flat plane. Therefore, there are no steps or unevenness on the side surfaces of each layer of battery 50, and no spaces that cannot function as a battery are created due to unevenness, resulting in a substantial increase in the volumetric energy density of battery 50. Furthermore, since the side surfaces of each layer can be made coplanar by cutting each layer together, the area of ​​insulating layer 13 and insulating layer 23 can be easily adjusted to manufacture battery 50.

[0109] The side surface of the battery 50 is, for example, a cut surface. Specifically, the side surface of the battery 50 is a surface formed by cutting with a cutting tool such as a cutter, and for example, a surface with fine grooves or other cutting marks. By forming a cut surface in the battery 50, the positions of the insulating layer 13 and the insulating layer 23 can be adjusted, thereby reducing the area of ​​the portion that does not contribute to the charge and discharge performance of the battery 50 (the portion where the insulating layer 13 and the insulating layer 23 are formed, as detailed later), and thus increasing the volumetric energy density. In addition, by having a cut surface, the side surfaces of the electrode layer 10, the counter electrode layer 20, and the solid electrolyte layer 30 can be easily made coplanar. It should be noted that the cutting marks can also be smoothed by grinding or the like. The shape of the cut surface is not limited, but in the case of the battery 50, it is rectangular.

[0110] Furthermore, in battery 50, the sides of the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21 are exposed. In other words, the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21 are arranged in a positional relationship where their outer peripheral sides are not covered by each other. Thus, each layer contributing to the charge-discharge performance of battery 50 is present up to the end of battery 50, thereby increasing the volumetric energy density of battery 50. It should be noted that the exposed sides may also be covered by terminals or sealing members, etc. That is, the aforementioned "exposed" means that the side edges of the stacked layers in battery 50 are not covered by the end sides of other layers.

[0111] Furthermore, in battery 50, the current collector 11, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, and current collector 21 have the same shape and position when viewed in a planar view. Additionally, the planar shape of the current collector 11, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, and current collector 21 is rectangular, but not particularly limited; they can also be circular, elliptical, or polygonal, etc.

[0112] The current collector 11 is in contact with and covers the lower surfaces of the electrode active material layer 12 and the insulating layer 13. When viewed in a planar view, the insulating layer 13 is stacked at the end of the current collector 11. The thickness of the current collector 11 is, for example, 5 μm or more and 100 μm or less.

[0113] As the material for the current collector 11, known materials can be used. For example, a foil, plate, or mesh made of copper, aluminum, nickel, iron, stainless steel, platinum, or gold, or an alloy of two or more of them, can be used for the current collector 11.

[0114] The electrode active material layer 12 is stacked above the current collector 11, covering the insulating layer 13 on the current collector 11. The lower surface of the electrode active material layer 12 is also in contact with the current collector 11. The upper surface of the electrode active material layer 12 is in contact with the solid electrolyte layer 30. The electrode active material layer 12 and the counter electrode active material layer 22 face each other, sandwiching the solid electrolyte layer 30. The electrode active material layer 12 has an area that does not overlap with the insulating layer 13 when viewed in planar view. Furthermore, when viewed in planar view, the electrode active material layer 12 and the counter electrode active material layer 22 have the same shape and position. The thickness of the electrode active material layer 12 is, for example, 5 μm or more and 300 μm or less. The material used for the electrode active material layer 12 will be described later.

[0115] As described above, the insulating layer 13 is located between the current collector 11 and the electrode active material layer 12. The upper surface and the inner side surface of the insulating layer 13 (when viewed in plan view) are in contact with the electrode active material layer 12. When viewed in plan view, the insulating layer 13 is in contact with the electrode active material layer 12 at the end of the electrode layer 10. The side surface of the insulating layer 13 is coplanar with the side surface of the current collector 11. Furthermore, the side surface of the insulating layer 13 is coplanar with the side surface of the electrode active material layer 12. The lower surface of the insulating layer 13 is in contact with the current collector 11. Additionally, when viewed in plan view, the insulating layer 13 overlaps with the counter electrode active material layer 22.

[0116] In the illustrated example, the insulating layer 13 is located on the outer periphery of the electrode layer 10 and is frame-shaped when viewed in a planar manner. That is, the insulating layer 13 is located between the current collector 11 and the electrode active material layer 12 at all ends of the electrode layer 10 in a direction perpendicular to the stacking direction.

[0117] The insulating layer 13 may comprise at least one of a resin and a metal oxide. Examples of resins include silicone resin, epoxy resin, acrylic resin, or polyimide resin. The resin may also be a thermosetting resin or a UV-curable resin. By including a resin in the insulating layer 13, the bonding strength between the insulating layer 13 and the current collector 11 and the electrode active material layer 12 can be improved through an anchoring effect, such as the resin embedding into the current collector 11 and the electrode active material layer 12. Examples of metal oxides include silicon oxide, titanium oxide, or aluminum oxide. Because the insulating layer 13 comprises a metal oxide, it becomes harder. Therefore, even if the insulating layer 13 is formed thin during the manufacturing of the battery 50, it is not easily deformed when stacked with other layers, and a thin insulating layer 13 of uniform thickness can be formed.

[0118] The thickness of the insulating layer 13 is, for example, thinner than the thickness of the electrode active material layer 12. Furthermore, the thickness of the insulating layer 13 is more than half the thickness of the current collector 11. Therefore, even when terminals are formed on the side of the current collector 11, the location of the terminals is easily identifiable. Additionally, even when terminals are formed using conductive resin or the like, the wettability of the conductive resin is improved by the insulating layer 13, making terminal formation easier. From the viewpoint of improving these effects, the thickness of the insulating layer 13 can be more than 80% of the thickness of the current collector 11, or even more than the thickness of the current collector 11. Furthermore, the thickness of the insulating layer 13 can be, for example, 5 μm or more, or even 10 μm or more. The insulating layer 13 is, for example, completely insulating, but depending on the desired battery characteristics, it can also be slightly conductive through the constituent materials and thickness of the insulating layer 13.

[0119] Furthermore, from the viewpoint of the effective area contributing to power generation, i.e., the volumetric energy density, the insulating layer 13 is, for example, located in a region with a length of 1 mm or less from the outer periphery of the electrode active material layer 12 when viewed in a planar manner. That is, the length of the insulating layer 13 in the direction from the outer periphery of the battery 50 toward the center is, for example, 1 mm or less. Additionally, from the viewpoint of volumetric energy density, when the insulating layer 13 is formed in a frame shape or a line shape, the width of the insulating layer 13 is, for example, 1 mm or less, or 0.5 mm or less, or even 0.1 mm or less. The width of the insulating layer 13 can be varied, for example, depending on the desired battery characteristics.

[0120] Furthermore, when viewed in a planar view, the length of the insulating layer 13 in the direction from the outer periphery of the battery 50 toward the center is greater than the length of the insulating layer 23 in the same direction. When viewed in a planar view, the insulating layer 13 also exists in a region of the battery 50 that is closer to the inside of the battery than the region where the insulating layer 23 is formed.

[0121] The current collector 21 is in contact with the upper surface of the active material layer 22 of the counter electrode and the upper surface of the insulating layer 23, covering the upper surface of the active material layer 22 of the counter electrode and the upper surface of the insulating layer 23. The thickness of the current collector 21 is, for example, 5 μm or more and 100 μm or less. The material of the current collector 11 described above can be used as the material of the current collector 21.

[0122] The counter electrode active material layer 22 is stacked on the solid electrolyte layer 30 and disposed opposite to the counter electrode active material layer 12. The upper surface of the counter electrode active material layer 22 is in contact with the current collector 21. Furthermore, the counter electrode active material layer 22 is in contact with the lower surface of the insulating layer 23 and covers the lower surface of the insulating layer 23. The counter electrode active material layer 22 has an area that does not overlap with the insulating layer 23 when viewed in a planar manner. The thickness of the counter electrode active material layer 22 is, for example, 5 μm or more and 300 μm or less. The material used for the counter electrode active material layer 22 will be described later.

[0123] As described above, the insulating layer 23 is located between the current collector 21 and the counter electrode active material layer 22. The upper surface and the inner side surface of the insulating layer 23 (when viewed in plan view) are in contact with the counter electrode active material layer 22. When viewed in plan view, the insulating layer 23 is in contact with the counter electrode active material layer 22 at the end of the counter electrode layer 20. The side surface of the insulating layer 23 is coplanar with the side surface of the current collector 21. The side surface of the insulating layer 23 is coplanar with the side surface of the counter electrode active material layer 22. The lower surface of the insulating layer 23 is in contact with the current collector 21. Furthermore, the insulating layer 23 overlaps with the insulating layer 13 when viewed in plan view.

[0124] In the illustrated example, the insulating layer 23 is located on the outer periphery of the counter electrode layer 20 and is frame-shaped when viewed in a planar view. That is, the insulating layer 23 is located between the current collector 21 and the counter electrode active material layer 22 at all ends of the counter electrode layer 20 in a direction perpendicular to the stacking direction.

[0125] As the material for insulating layer 23, the materials mentioned in the description of insulating layer 13 above can be used. Insulating layer 13 and insulating layer 23 can be made of the same material, for example. Therefore, it is not necessary to use different materials in insulating layer 13 and insulating layer 23, and the battery 50 can be easily manufactured. It should be noted that insulating layer 13 and insulating layer 23 can also be made of different materials.

[0126] The thickness of the insulating layer 23 is, for example, thinner than the thickness of the counter electrode active material layer 22. Furthermore, the thickness of the insulating layer 23 is more than half the thickness of the current collector 21. Therefore, even when a terminal is formed on the side of the current collector 21, the location of the terminal is easily identifiable. Additionally, even when a conductive resin or the like is used to form the terminal, the wettability of the conductive resin is improved by the insulating layer 23, making terminal formation easier. From the viewpoint of improving these effects, the thickness of the insulating layer 23 can be more than 80% of the thickness of the current collector 21, or even more than the thickness of the current collector 21. Furthermore, the thickness of the insulating layer 23 can be, for example, 5 μm or more, or even 10 μm or more. The insulating layer 23 is, for example, completely insulating, but depending on the desired battery characteristics, it can also be slightly conductive through the constituent materials and thickness of the insulating layer 23.

[0127] Furthermore, from the viewpoint of the effective area contributing to power generation, i.e., the volumetric energy density, the insulating layer 23 is, for example, located in a region with a length of 1 mm or less from the outer periphery of the counter electrode active material layer 22 when viewed in a planar manner. That is, the length of the insulating layer 23 in the direction from the outer periphery of the battery 50 toward the center is, for example, 1 mm or less. Additionally, from the viewpoint of volumetric energy density, when the insulating layer 23 is formed in a frame shape or a line shape, the width of the insulating layer 23 is, for example, 1 mm or less, or 0.5 mm or less, or even 0.1 mm or less. The width of the insulating layer 23 can be varied, for example, depending on the desired battery characteristics.

[0128] The solid electrolyte layer 30 is located between the electrode active material layer 12 and the counter electrode active material layer 22. The thickness of the solid electrolyte layer 30 is, for example, 5 μm or more and 150 μm or less.

[0129] The solid electrolyte layer 30 contains at least a solid electrolyte and may also contain a binder material if necessary. The solid electrolyte layer 30 may also contain a solid electrolyte with lithium-ion conductivity.

[0130] As a solid electrolyte, known materials such as lithium-ion conductors, sodium-ion conductors, or magnesium-ion conductors can be used. For example, solid electrolyte materials such as sulfide solid electrolytes, halogen-based solid electrolytes, or oxide solid electrolytes can be used. As a sulfide solid electrolyte, in the case of materials capable of conducting lithium ions, a composite consisting of lithium sulfide (Li₂S) and phosphorus pentasulfide (P₂S₅) can be used. Furthermore, as a sulfide solid electrolyte, sulfides such as Li₂S-SiS₂, Li₂S-B₂S₃, or Li₂S-GeS₂ can also be used, and sulfides containing at least one of Li₃N, LiCl, LiBr, Li₃PO₄, and Li₄SiO₄ can be added as additives to the aforementioned sulfides.

[0131] As an oxide solid electrolyte, in the case of materials capable of conducting lithium ions, such as Li7La3Zr2O, is used. 12 (LLZ), Li 1.3 Al 0.3 Ti 1.7 (PO4)3(LATP) or (La,Li)TiO3(LLTO), etc.

[0132] As an adhesive material, elastomers can be used, or organic compounds such as poly(1,1-difluoroethylene), acrylic resins, or cellulose resins can be used.

[0133] In this embodiment, one of the electrode layer 10 having an electrode active material layer 12 and the counter electrode layer 20 having a counter electrode active material layer 22 is a positive electrode layer having a positive electrode active material layer, and the other is a negative electrode layer having a negative electrode active material layer.

[0134] The positive electrode active material layer contains at least a positive electrode active material, and may also contain at least one of a solid electrolyte, a conductive additive, and a binder material, as needed.

[0135] As positive electrode active materials, known materials capable of adsorbing and releasing (inserting and desorbing, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions can be used. When the positive electrode active material is a material capable of desorbing and inserting lithium ions, examples include lithium cobalt oxide (LCO), lithium nickel oxide (LNO), lithium manganese oxide (LMO), lithium-manganese-nickel oxide (LMNO), lithium-manganese-cobalt oxide (LMCO), lithium-nickel-cobalt oxide (LNCO), or lithium-nickel-manganese-cobalt oxide (LNMCO).

[0136] The aforementioned solid electrolyte materials can be used as solid electrolytes. Additionally, conductive materials such as acetylene black, carbon black, graphite, or carbon fiber can be used as conductive additives. Furthermore, the aforementioned adhesive materials can be used as binders.

[0137] The negative electrode active material layer contains at least a negative electrode active material, and may also contain at least one of the same solid electrolyte, conductive additives and binder materials as the positive electrode active material layer, as needed.

[0138] As a negative electrode active material, known materials capable of absorbing and releasing (inserting and desorbing, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions can be used. When the negative electrode active material is a material capable of desorbing and inserting lithium ions, examples include carbon materials such as natural graphite, artificial graphite, graphite carbon fibers, or resin-calcined carbon, metallic lithium, lithium alloys, or oxides of lithium and transition metal elements.

[0139] Thus, the battery 50 includes an electrode layer 10, a counter electrode layer 20 disposed opposite to the electrode layer 10, and a solid electrolyte layer 30 located between the electrode layer 10 and the counter electrode layer 20. The electrode layer 10 has a current collector 11, an electrode active material layer 12 located between the current collector 11 and the solid electrolyte layer 30, and an insulating layer 13 located at the end of the electrode layer 10 between the current collector 11 and the electrode active material layer 12 when viewed in planar view. The counter electrode layer 20 has a current collector 21, a counter electrode active material layer 22 located between the current collector 21 and the solid electrolyte layer 30, and an insulating layer 23 located at the end of the counter electrode layer 20 between the current collector 21 and the counter electrode active material layer 22 when viewed in planar view.

[0140] Therefore, at the ends of current collectors 11 and 21, where peeling is likely to occur, there are insulating layers 13 between current collector 11 and electrode active material layer 12, and insulating layers 23 between current collector 21 and counter electrode active material layer 22. Thus, even if current collectors 11 and 21 peel off, exposure of electrode active material layer 12 and counter electrode active material layer 22 is suppressed, making it less likely for damage or short circuits to occur due to contact between electrode active material layer 12 and counter electrode active material layer 22 and other components. This improves the reliability of battery 50. Furthermore, even when terminals for current extraction are formed on the sides of current collectors 11 and 21, insulating layers 13 and 23 serve as markers, making the terminal formation location easily identifiable. Additionally, even when terminals are formed using materials such as conductive resin, the wettability of the material is improved by insulating layers 13 and 23, allowing for easy terminal formation. This suppresses short circuits and poor connections caused by poor terminal formation, thus improving the reliability of battery 50.

[0141] Furthermore, at the end of electrode layer 10, the side surface of current collector 11 and the side surface of insulating layer 13 are coplanar, and at the end of counter electrode layer 20, the side surface of current collector 21 and the side surface of insulating layer 23 are coplanar. Therefore, the area where the terminal is formed becomes a flat surface, thus making it easy to form the terminal.

[0142] Furthermore, since the sides of the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21 are all coplanar, the area of ​​insulating layer 13 and insulating layer 23 can be easily adjusted to manufacture the battery 50 by cutting each layer together. Therefore, due to the presence of insulating layer 13 and insulating layer 23, electron transfer between electrode active material layer 12 and current collector 11, and between counter electrode active material layer 22 and current collector 21, is suppressed, creating areas where electrode active material layer 12 and counter electrode active material layer 22 cannot function as electrodes. However, by adjusting the area of ​​insulating layer 13 and insulating layer 23, these areas can be minimized. This increases the volumetric energy density of the battery 50.

[0143] Furthermore, the length of the insulating layer 13 from the outer periphery of the battery 50 toward the center is, for example, greater than the length of the insulating layer 23 from the outer periphery of the battery 50 toward the center. Therefore, even if the current collector 11 is easier to peel off than the current collector 21, the longer length of the insulating layer 13 makes it easier to protect the electrode active material layer 12. Additionally, when the electrode layer 10 is the positive electrode layer and the counter electrode layer 20 is the negative electrode layer, the formation of dendrites in the counter electrode layer 20 can be suppressed. This point will also be explained in detail with reference to the comparative examples involving batteries 950 and 950a, where the area of ​​the negative electrode active material layer is larger than the area of ​​the positive electrode active material layer when viewed in a planar manner. In battery manufacturing, the area of ​​the negative electrode active material layer is generally larger than the area of ​​the positive electrode active material layer. The purpose is to make the capacity of the negative electrode active material layer larger than the capacity of the positive electrode active material layer, suppress the precipitation of metal (so-called dendrites) originating from metal ions not absorbed into the negative electrode active material layer, and improve the reliability of the battery. Furthermore, by positioning the end of the negative electrode active material layer further outward than the end of the positive electrode active material layer, it is possible to suppress the concentration of electric field towards the end of the negative electrode active material layer and thus suppress dendrite growth (metal precipitation). Figure 3 and Figure 4 This is a schematic cross-sectional view showing an example of the battery involved in the comparative example.

[0144] like Figure 3 As shown, the battery 950 includes a positive electrode layer 910, a negative electrode layer 920, and a solid electrolyte layer 930 located between the positive electrode layer 910 and the negative electrode layer 920. The positive electrode layer 910 has a current collector 911 and a positive active material layer 912 located between the current collector 911 and the solid electrolyte layer 930. The negative electrode layer 920 has a current collector 921 and a negative active material layer 922 located between the current collector 921 and the solid electrolyte layer 930. The solid electrolyte layer 930 covers the sides of the positive active material layer 912 and the negative active material layer 922 and is in contact with the current collector 911 and the current collector 921. In the battery 950, when viewed in a planar view, the area of ​​the negative active material layer 922 is larger than the area of ​​the positive active material layer 912, and the end of the negative active material layer 922 is located further outward than the end of the positive active material layer 912. Thus, in the battery 950, metal deposition is suppressed by making the area of ​​the negative electrode active material layer 922 larger than the area of ​​the positive electrode active material layer 912. Furthermore, since a solid electrolyte layer 930 is present at the end of the battery 950, exposure of the positive electrode active material layer 912 and the negative electrode active material layer 922 can be suppressed even if the current collector 911 and the current collector 921 are peeled off from the end.

[0145] Region 2C, containing both the positive electrode active material layer 912 and the negative electrode active material layer 922, functions as a battery. Region 2A, where neither the positive electrode active material layer 912 nor the negative electrode active material layer 922 is present, does not function as a battery. Similarly, region 2B, containing the negative electrode active material layer 922 but lacking the positive electrode active material layer 912, also does not function as a battery. Region 2B is equivalent to the area difference between the positive electrode active material layer 912 and the negative electrode active material layer 922. When viewed in planar form, the larger regions 2B and 2A are, the greater the proportion of regions in the battery 950 that do not contribute to power generation, and the lower the volumetric energy density of the battery 950. Conversely, when viewed in planar form, the smaller region 2B is, the higher the alignment accuracy required in manufacturing processes such as the layer stacking process, leading to concerns about increased inspection processes and equipment costs.

[0146] Furthermore, in regions 2A, 2B, and 2C, the types and numbers of layers other than the current collectors 911 and 921 in the thickness direction differ. Specifically, region 2A contains only one solid electrolyte layer 930; region 2B contains two layers: a negative electrode active material layer 922 and a solid electrolyte layer 930; and region 2C contains three layers: a positive electrode active material layer 912, a negative electrode active material layer 922, and a solid electrolyte layer 930. In all-solid-state batteries composed of powder materials, in order to form good interfaces between the powder materials (e.g., interfaces with good adhesion and low grain boundary resistance), that is, to improve battery reliability and increase volumetric energy density through high fill power, high-pressure pressing is sometimes included in the manufacturing process. In this case, the types and numbers of layers formed in regions 2A, 2B, and 2C differ, and the compressibility of each layer also differs. Therefore, there is a concern that the degree of compression varies in different regions when the battery 950 is compressed as a whole (that is, it is not compressed uniformly). For example, in regions 2A and 2B, the compression is insufficient compared to region 2C, raising concerns about a decrease in reliability, such as peeling of layers.

[0147] In other words, in battery 950, there are problems such as difficulty in easily manufacturing battery 950 and insufficient improvement in reliability. In addition, region 2A, where the layer in the thickness direction is only the solid electrolyte layer 930, is a part that does not particularly contribute to the basic charge and discharge performance of the battery. Therefore, from the viewpoint of improving volumetric energy density, region 2A is preferred to be less.

[0148] in addition, Figure 4The battery 950a shown includes a positive electrode layer 910 with a current collector 911 and a positive electrode active material layer 912, a negative electrode layer 920a with a current collector 921a and a negative electrode active material layer 922a, and a solid electrolyte layer 930a. Battery 950a differs from battery 950 in that the side of the solid electrolyte layer 930a is not covered by the negative electrode active material layer 922a. Battery 950a does not have a region like region 2A where neither the positive electrode active material layer 912 nor the negative electrode active material layer 922 is present, but it does have a region 3A where the positive electrode active material layer 912 is absent. Therefore, region 3A does not contribute to power generation, and the same problem as region 2B occurs in region 3A of battery 950a.

[0149] On the other hand, the battery 50 includes an electrode layer 10 having an insulating layer 13 and a counter electrode layer 20 having an insulating layer 23. In the battery 50, for example, the electrode layer 10 having an electrode active material layer 12 is a positive electrode layer having a positive active material layer, and the counter electrode layer 20 having a counter electrode active material layer 22 is a negative electrode layer having a negative active material layer. In this case, electrons do not directly reach the positive active material layer (electrode active material layer 12) connected to the insulating layer 13 from the current collector 11, therefore... Figure 2 The positive electrode active material layer in region 1A shown is difficult to function as an electrode. On the other hand, the positive electrode active material layer in region 1B functions as an electrode. Furthermore, electrons do not directly reach the negative electrode active material layer (counter electrode active material layer 22) connected to the insulating layer 23 from the current collector 21; therefore... Figure 2 The negative electrode active material layer in region 1AA is difficult to function as an electrode. On the other hand, the negative electrode active material layer in region 1BB functions as an electrode. In battery 50, the areas of the positive and negative electrode active material layers are the same when viewed in a planar manner, but region 1A is larger than region 1AA, and region 1B is smaller than region 1BB. Therefore, the area of ​​the positive electrode active material layer that is easy to function as an electrode is relatively smaller, resulting in a substantial reduction in the area of ​​the positive electrode active material layer when viewed in a planar manner. In other words, in battery 50, even if the areas of the positive and negative electrode active material layers are the same when viewed in a planar manner, metal deposition is suppressed.

[0150] Furthermore, since the positive and negative active material layers have the same shape and position when viewed in a planar manner, and the insulating layer 13 is located at the end of the positive electrode layer (electrode layer 10) and the insulating layer 23 is located at the end of the negative electrode layer (counter electrode layer 20), the region in the negative active material layer that functions as an electrode is also located further outward than the region in the positive active material layer that functions as an electrode. As a result, the electric field concentration at the end of the region in the negative active material layer that functions as an electrode is suppressed, and dendrite growth at the end is suppressed. Therefore, the reliability of the battery 50 is improved.

[0151] Furthermore, in the manufacturing of battery 50, the areas of the substantial positive and negative active material layers can be adjusted using insulating layers 13 and 23, thus eliminating the need for highly precise formation of the positions and areas of the positive and negative active material layers. This allows for easy manufacturing of battery 50. For example, battery 50 can be easily manufactured by cutting the laminate formed by stacking the positive electrode layer (electrode layer 10), the solid electrolyte layer 30, and the negative electrode layer (counter electrode layer 20) in the region including insulating layers 13 and 23.

[0152] Furthermore, since the insulating layer 13 is located between the current collector 11 and the electrode active material layer 12, the electrode active material layer 12 is also present on the insulating layer 13. Similarly, since the insulating layer 23 is located between the current collector 21 and the counter electrode active material layer 22, the counter electrode active material layer 22 is also present on the insulating layer 23. Therefore, even under high-voltage compression processing, compared to the case where a solid electrolyte layer exists on the sides of the electrode active material layer 12 and the counter electrode active material layer 22, as in the comparative example described above, the entire area can be easily and uniformly compressed. As a result, peeling of the layers of the battery 50 is less likely to occur, and the reliability and volumetric energy density of the battery 50 can be improved through high-voltage compression processing.

[0153] [Manufacturing Method]

[0154] Next, the method for manufacturing the battery according to this embodiment will be described. It should be noted that the method for manufacturing the battery 50 described below is just one example, and the method for manufacturing the battery 50 is not limited to the example below.

[0155] The manufacturing method of battery 50 includes an insulating layer lamination process, a power generation element lamination process, a current collector lamination process, and a cutting process. The following provides a detailed description of each process.

[0156] (1) Insulation layer lamination process

[0157] First, the process of laminating the insulating layer will be explained. Figure 5 This is a flowchart illustrating the battery manufacturing method according to this embodiment.

[0158] In the insulating layer lamination process, an insulating layer 13 is laminated on at least one surface of the current collector 11. Specifically, firstly, the current collector 11 is prepared ( Figure 5 Step S11). Then, an insulating layer 13 is formed on at least one side of the prepared current collector 11 as an electrode-side insulating layer. Figure 5(Step S12). For example, an insulating layer 13 is formed in the current collector 11 by stacking an insulating layer 13 on the upper surface of the current collector 11. In the description of this manufacturing method, the current collector 11 is an example of a first current collector, and the insulating layer 13 is an example of a first insulating layer.

[0159] Figure 6A , Figure 6B and Figure 6C This is a schematic diagram showing an example of a current collector 11 with an insulating layer 13 stacked on top of it. Figure 6A (a) is a top view showing an example of a current collector 11 with a stacked insulating layer 13. Figure 6A (b) is shown Figure 6A A cross-sectional view at the location indicated by line VIa-VIa in (a). For example, as... Figure 6A As shown, the insulating layer 13 is formed in a lattice pattern. Additionally, Figure 6B This is a top view showing another example of a current collector 11 with a stacked insulating layer 13. Figure 6B There is no illustrated sectional view, but Figure 6B The current collector 11 shown, which has an insulating layer 13 stacked on top of it, is... Figure 6A (b) has the same cross-sectional structure. Insulating layer 13 can also be as... Figure 6B As shown, it is formed in a striped pattern. By stacking the insulating layer 13 into a relatively simple planar shape with long-length portions, such as a grid or stripes, the insulating layer 13 can be easily formed in the current collector 11. Furthermore, by cutting the insulating layer 13 along its long-length direction in the cutting process described later, a battery 50 with the insulating layer 13 formed along its ends can be easily formed. Figure 6A and 6B In the diagram, the rectangular regions 1E and 1F, indicated by the dashed lines, correspond to the size of a battery 50. Thus, for the current collector 11, the insulating layer 13 can be stacked in a manner that allows it to be divided into multiple batteries in subsequent manufacturing processes.

[0160] in addition, Figure 6C (a) is a top view showing yet another example of a current collector 11 with a stacked insulating layer 13. Figure 6C (b) is Figure 6C A cross-sectional view at the location indicated by line VIc-VIc in (a). Figure 6C As shown, a grid-like insulating layer 13 with various patterns (e.g., grid spacing) can also be formed on the current collector 11.

[0161] In this way, by stacking the insulating layers 13 into a grid or stripe pattern and then cutting the insulating layers 13 along the longitudinal direction of the grid or stripes in the cutting process described later, multiple batteries 50 of the same or different shapes can be manufactured simultaneously. As a result, the manufacturing efficiency of the battery 50 is improved.

[0162] Various processes can be considered for forming the insulating layer 13, but from a mass production point of view, a coating process is preferred. For example, in a continuous process such as roll-to-roll, a coating obtained by dispersing an insulating material (e.g., metal oxide) in a solvent is applied to the current collector 11 using a high-precision coating method such as gravure roller coating or inkjet coating. The coating is then dried to evaporate the solvent, thereby obtaining the insulating layer 13. This allows the insulating layer 13 to be laminated thinly, resulting in a thin insulating layer 13 of uniform thickness. Consequently, during the high-pressure pressing process when laminating other layers in the power generation element lamination process described later, the insulating layer 13 does not easily affect the other layers, and they are easily and uniformly compressed. Furthermore, by using such a high-precision coating method, the accuracy of the area of ​​the electrode active material layer 12, which is effectively used as an electrode, is substantially improved.

[0163] When resin is used as the material for the insulating layer 13, a solution obtained by dissolving or dispersing the resin can be applied to the current collector 11, or an ultraviolet-curable resin or a thermosetting resin can be applied to the current collector 11 and cured. It should be noted that the formation of the insulating layer 13 is not limited to continuous processes such as roll-to-roll, but can also be a batch process in which the insulating layer 13 is formed for each current collector 11.

[0164] For the solvent used in the formation of the insulating layer 13, general organic solvents or aqueous solvents that disperse or dissolve metal oxides or resins can be used.

[0165] (2) Power generation element stacking process

[0166] Next, the power generation element stacking process will be described. In the power generation element stacking process, a power generation element 40, which is formed by sequentially stacking the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22, and a current collector 11, in which an insulating layer 13 is stacked in the insulating layer stacking process, are stacked such that the electrode active material layer 12 is covered by the insulating layer 13. In this way, in the power generation element stacking process, a structure in which the electrode active material layer 12 is covered by the insulating layer 13 is formed.

[0167] In the process of stacking power generation elements, the power generation element section 40 is formed, for example, by sequentially stacking the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 onto the current collector 11. Specifically, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are sequentially stacked onto the current collector 11 on which the insulating layer 13 is stacked in this order. Figure 5Steps S13, S14, and S15). For example, an electrode active material layer 12 is stacked on a current collector 11 with an insulating layer 13, with the insulating layer 13 covered, and then a solid electrolyte layer 30 and a counter electrode active material layer 22 are stacked sequentially. Furthermore, if necessary, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 stacked in steps S13, S14, and S15 are subjected to high-voltage pressing (…). Figure 5 (Step S16). Additionally, as needed, the electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22, which were laminated in steps S13, S14, and S15, are subjected to heat treatment. This results in a laminated electrode plate with a power generation element 40 laminated on a current collector 11 on which an insulating layer 13 is laminated. It should be noted that, in the power generation element lamination process, the power generation element 40, formed by pre-laminating the electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22, can also be laminated onto the current collector 11.

[0168] Figure 7A , Figure 7B and Figure 7C This is a schematic cross-sectional view illustrating an example of a laminated electrode plate according to this embodiment. Figure 7A As shown, in the laminated electrode plate 41, the power generation element 40, formed by sequentially stacking the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22, is stacked on the current collector 11, which is covered with an insulating layer 13. The laminated electrode plate 41 is formed such that the area and position of each of the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are the same when viewed from a planar perspective. Furthermore, the upper surface of the counter electrode active material layer 22 is exposed.

[0169] The construction of the laminated electrode 41 is not limited to this example. For example, as shown... Figure 7B As shown, the laminated electrode plate 41a is formed such that a solid electrolyte layer 30 covers the side surface and top surface of the electrode active material layer 12, and a counter electrode active material layer 22 covers the side surface and top surface of the solid electrolyte layer 30. Therefore, since the electrode active material layer 12 is covered by the solid electrolyte layer 30, the generation of short circuits caused by the contact between the electrode active material layer 12 and the counter electrode active material layer 22 is suppressed during the power generation element lamination process.

[0170] Additionally, for example, such as Figure 7CAs shown, the stacked electrode plate 41b is formed such that the areas of the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 decrease sequentially when viewed in a planar manner. Furthermore, when viewed in a planar manner, the counter electrode active material layer 22 is located inside the solid electrolyte layer 30, and the solid electrolyte layer 30 is located inside the electrode active material layer 12. Because the counter electrode active material layer 22 is located inside the solid electrolyte layer 30, even if the stacking position shifts when viewing in a planar manner during the stacking of the counter electrode active material layer 22, the solid electrolyte layer 30 can suppress the generation of short circuits caused by the contact between the electrode active material layer 12 and the counter electrode active material layer 22.

[0171] In this embodiment, the stacked electrode plate can be any of the stacked electrode plates 41, 41a and 41b, as long as it is a structure in which the power generation element part 40 is stacked on the current collector 11 on which the insulating layer 13 is stacked, or it can be a structure other than the stacked electrode plates 41, 41a and 41b.

[0172] The electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 constituting the power generation element 40 are formed sequentially, for example, using a wet coating method. By using a wet coating method, the power generation element 40 can be easily laminated onto the current collector 11. As a wet coating method, coating methods such as mold coating, doctor blade coating, roller coating, screen printing, or inkjet coating are used, but are not limited to these methods.

[0173] When using the wet coating method, a coating process is performed in which the materials that form the electrode active material layer 12, the solid electrolyte layer 30 and the counter electrode active material layer 22 (the materials of the positive electrode active material layer, the solid electrolyte layer 30 and the negative electrode active material layer mentioned above) and the solvent are appropriately mixed to obtain a slurry.

[0174] For the solvents used in the coating process, known solvents used in the manufacture of known all-solid-state batteries (e.g., lithium-ion all-solid-state batteries) can be used.

[0175] The slurry obtained in the coating process is applied to the current collector 11, where the insulating layer 13 is formed, in the order of electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22. At this time, the next layer can be applied after the previous layer has been applied, or the next layer can be applied during the previous layer's application. That is, steps S13, S14, and S15 can be performed simultaneously. After each layer is applied, for example, heat treatment to remove solvent and binder materials and high-pressure pressing to promote material filling in each layer are performed. It should be noted that heat treatment and high-pressure pressing can also be performed on each layer. That is, step S16 can also be performed between each of steps S13, S14, and S15. Heat treatment and high-pressure pressing can be performed on each coating layer of the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22, or they can be performed separately after any two coating layers are stacked and after one coating layer is stacked, or they can be performed together after all three coating layers are stacked. Furthermore, high-pressure pressing can be performed using, for example, roller pressing or flatbed pressing. It should be noted that at least one of the heat treatment and high-pressure pressing processes may not be performed.

[0176] By employing this layer-coating method, the bonding strength and interfacial resistance of the interfaces between the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, and counter-electrode active material layer 22 can be improved. Furthermore, the bonding strength and grain boundary resistance of the powder materials used in the electrode active material layer 12, solid electrolyte layer 30, and counter-electrode active material layer 22 can be improved. In other words, a good interface is formed between the layers of the power generation element section 40 and between the powder materials within each layer.

[0177] It should be noted that the insulation layer lamination process and the power generation element lamination process can also be carried out through a series of continuous processes such as roll-to-roll.

[0178] (3) Current collector stacking and cutting process

[0179] Next, the current collector stacking process and the cutting process will be explained. Figure 8 This diagram illustrates the current collector stacking and cutting processes in the battery manufacturing method according to this embodiment. In the current collector stacking process, an additional current collector having an insulating layer formed on the electrode side is stacked onto the stacked electrode plates. Figure 5 Step S17). For example, as Figure 8As shown, a current collector 21 with an insulating layer 23 is laminated on the side of the power generation element 40 in the laminated electrode 41 opposite to the current collector 11 side (the side of the power generation element 40 perpendicular to the lamination direction where the current collector 11 is not laminated). In other words, an insulating layer 23 and a current collector 21 are laminated on the power generation element 40 laminated to the current collector 11. At this time, for example, the current collector 21 with the insulating layer 23 is bonded to the exposed upper surface of the counter electrode active material layer 22 of the laminated electrode 41 by a pressing process or the like. The pressing process is performed, for example, at a pressure lower than the high-pressure pressing process in step S16. Furthermore, the current collector 21 with the insulating layer 23 is laminated on the laminated electrode 41 in such a way that the insulating layer 23 is sandwiched between the counter electrode active material layer 22 and the current collector 21. In the description of this manufacturing method, insulating layer 23 is an example of a second insulating layer, and current collector 21 is an example of a second current collector.

[0180] The current collector 21 with the insulating layer 23 is formed, for example, by laminating the insulating layer 23 onto the upper surface of the current collector 21 in the same manner as the current collector 11 with the insulating layer 13 described above. The shape of the insulating layer 23 at this time is, for example, similar to... Figure 6A , 6B and Figure 6C The insulating layer 13 shown has the same pattern, but is narrower than the width of the insulating layer 13. That is, the insulating layer 23 is stacked such that its area is smaller than that of the insulating layer 13 when viewed in a planar manner. Thus, the insulating layer 23 is formed on the current collector 21 in accordance with the pattern of the insulating layer 13 formed on the current collector 11. Furthermore, when viewed in a planar manner, the current collector 21 on which the insulating layer 23 is stacked is formed on the stacked electrode plate 41 in such an overlapping manner that the insulating layer 13 and the insulating layer 23 are located. For example, the current collector 21 on which the insulating layer 23 is stacked on the stacked electrode plate 41 in such a manner that the entire insulating layer 23 of the region ultimately forming the battery 50 overlaps with the insulating layer 13.

[0181] Next, in the cutting process, the stacked electrode plates 41, 41a, or 41b of the current collector 21, which have formed the insulating layer 23, are stacked together in the current collector stacking process and cut in the stacking direction at the location where the insulating layer 13 and the insulating layer 23 are separated. Figure 5 Step S18). A stacked electrode plate 41, 41a, or 41b having a current collector 21 with an insulating layer 23 is stacked; in other words, a current collector 11 having an insulating layer 13, a power generation element 40, an insulating layer 23, and a current collector 21 stacked. For example... Figure 8As shown, the stacked electrode plate 41, on which the current collector 21 with the insulating layer 23 is stacked, is cut at positions such as the dashed lines C1, C2, C3, and C4 where the insulating layers 13 and 23 are arranged, using a knife or laser. At positions C1, C2, C3, and C4, the current collector 11, the insulating layer 13, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, the insulating layer 23, and the current collector 21 are stacked in this order, and then cut together. Therefore, it is not necessary to stack each layer of the power generation element 40 in the cut shape, thus the battery 50 can be easily manufactured. For example, when viewed in a plane, the insulating layer 13 is stacked as follows... Figure 6A , Figure 6B and Figure 6C In the case of a grid or stripe pattern with a long length, as shown, the stacked electrode plates, on which the current collector 21 with the insulating layer 23 is formed, are cut along the long length direction of the grid or stripe pattern of the insulating layer 13. This results in a battery 50 where the insulating layer 13 and the insulating layer 23 are located over the entire end region of the cut surface side of the manufactured battery 50.

[0182] It should be noted that, in the current collector stacking process, an insulating layer 23 may also be stacked on the upper surface of the counter electrode active material layer 22 in the stacked electrode plate 41, at the position where it overlaps with the insulating layer 13 when viewed in a plane, and then the current collector 21 may be further stacked on it. In this case, after the current collector 21 is stacked on the stacked electrode plate 41 with the insulating layer 23, a cutting process is performed.

[0183] Thus, the manufacturing method of battery 50 includes a cutting step that cuts off the stacked current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21. As a result, at the ends in a direction perpendicular to the stacking direction, the sides of each of the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23, and current collector 21 are exposed. It should be noted that after cutting, sealing members or the like can be provided to cover the exposed sides in order to protect them. That is, even when other components such as sealing members are used to cover the sides, the exposed sides may sometimes be covered by other components.

[0184] Thus, through a cutting process that includes cutting off the positions where the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23 and current collector 21 are stacked, the ends of each of the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, counter electrode active material layer 22, insulating layer 23 and current collector 21 in a direction perpendicular to the stacking direction are exposed.

[0185] (4) Effects, etc.

[0186] As described above, the manufacturing method of the battery 50 according to this embodiment includes an insulating layer stacking process, a power generation element stacking process, a current collector stacking process, and a cutting process. In the insulating layer stacking process, an insulating layer 13 is stacked on a portion of at least one side of the current collector 11. In the power generation element stacking process, a power generation element portion 40, formed by sequentially stacking an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22, is stacked with a current collector 11 having an insulating layer 13, such that the electrode active material layer 12 is covered by the insulating layer 13. In the current collector stacking process, a current collector 21 having an insulating layer 23 is stacked on a stacked electrode plate 41 formed by stacking the power generation element portion 40 onto the current collector 11. In the cutting process, the stacked electrode plate 41 with the current collector 21 having the insulating layer 23 is cut in the stacking direction at the location where the insulating layer 13 and the insulating layer 23 are separated.

[0187] Therefore, the stacked electrode plate 41, which has the current collector 21 with the insulating layer 23 formed thereon, is cut off along the stacking direction at the position where the insulating layer 13 and the insulating layer 23 are separated. Therefore, it is not necessary to stack each layer of the power generation element 40 in the cut shape, so the battery 50 can be easily manufactured.

[0188] Furthermore, since the stacked electrode plate 41, on which the current collector 21 with the insulating layer 23 is formed, is cut in the stacking direction at the position where the insulating layer 13 and the insulating layer 23 are separated, a battery 50 is manufactured in which, when viewed in plan view, the insulating layer 13 is stacked at the end of the current collector 11 and the insulating layer 23 is stacked at the end of the current collector 21. Moreover, since the electrode active material layer 12 is stacked in such a way as to cover the insulating layer 13 of the current collector 11 and the counter electrode active material layer 22 is stacked in such a way as to cover the insulating layer 23 of the current collector 21, at the end of the current collector 11 of the manufactured battery 50, the current collector 11, the insulating layer 13 and the electrode active material layer 12 are stacked in this order, and at the end of the current collector 21, the current collector 21, the insulating layer 23 and the counter electrode active material layer 22 are stacked in this order. Therefore, even if the current collectors 11 and 21 peel off at their ends, where peeling is likely to occur, only the insulating layers 13 and 23 are exposed, thus suppressing the exposure of the electrode active material layer 12 and the counter electrode active material layer 22. As a result, damage or short circuits caused by contact between the electrode active material layer 12 and the counter electrode active material layer 22 and other components are less likely to occur. This allows for the manufacture of a highly reliable battery 50.

[0189] Furthermore, the dimensions of insulating layers 13 and 23 can be determined simply by adjusting the cutting position. Therefore, although the presence of insulating layers 13 and 23 may create areas where the electrode active material layer 12 and the counter electrode active material layer 22 cannot function as electrodes, these areas can be minimized by adjusting the dimensions of insulating layers 13 and 23. This allows for the easy manufacture of a battery 50 with high volumetric energy density.

[0190] Furthermore, when electrode active material layer 12 is a positive electrode active material layer and counter electrode active material layer 22 is a negative electrode active material layer, by making the width of insulating layer 13 larger than the width of insulating layer 23, as described above, the substantial area (the area that functions as an electrode) of the positive electrode active material layer is smaller than that of the negative electrode active material layer, and the area that functions as an electrode is located inside the negative electrode active material layer when viewed in planar view. As a result, as described above, metal deposition into the negative electrode active material layer can be suppressed. Therefore, the reliability of the manufactured battery 50 is further improved.

[0191] Furthermore, by cutting along the stacking direction, the stacked electrode plate 41, on which the current collector 21 with the insulating layer 23 is formed, is also cut off, resulting in a battery 50 with insulating layers 13 and 23 stacked at the ends of the current collector 11 and the current collector 21, respectively. Therefore, it is not necessary to stack the positive electrode active material layer and the negative electrode active material layer, which have shapes with substantial area differences, independently for each single cell, thus enabling easy and highly efficient manufacturing of the battery 50.

[0192] Without insulating layers 13 and 23, even if the stacked body consisting of current collector 11, power generation element 40, and current collector 21 is cut together, the electrode active material layer 12 will be stacked at the end of current collector 11 and the counter electrode active material layer 22 will be stacked at the end of current collector 21. Therefore, when the ends of current collector 11 and current collector 21 are peeled off, the exposure of electrode active material layer 12 and counter electrode active material layer 22 cannot be suppressed. Moreover, a battery without a substantial area difference between electrode active material layer 12 and counter electrode active material layer 22 is manufactured. Therefore, even if the battery can be easily manufactured, the reliability of the battery decreases, making it difficult to adopt as a manufacturing method. On the other hand, in the manufacturing method according to this embodiment, as described above, the stacked electrode plate 41 on which the current collector 21 with insulating layer 23 is formed is cut together at the location where insulating layers 13 and 23 are separated. Therefore, in addition to easily manufacturing a battery by cutting the stacked electrode plate 41, on which the current collector 21 with the insulating layer 23 is stacked, it is also possible to suppress the exposure of the electrode active material layer 12 and the electrode active material layer 22, adjust the relative value of the area of ​​the electrode active material layer 12 that functions as an electrode, and adjust the area of ​​the insulating layer 13 and the insulating layer 23. Thus, by combining the current collector stacking process of stacking the current collector 21 with the insulating layer 23 on the stacked electrode plate 41 and the cutting process of cutting the stacked electrode plate 41, on which the current collector 21 with the insulating layer 23 is stacked, at the position where the insulating layer 13 and the insulating layer 23 are split, it is possible to easily manufacture a battery with high reliability and high volumetric energy density.

[0193] (5) Other manufacturing methods

[0194] The battery manufacturing method described in this embodiment is not limited to the examples above; for example, it may also be the manufacturing method shown below.

[0195] First, prepare Figure 1 and Figure 2 The current collector 11 is shown in the diagram. Then, a coating process, etc., is used to... Figure 1 and Figure 2 The shape shown is achieved by stacking an insulating layer 13 on the current collector 11. On the entire surface of the current collector 11 with the insulating layer 13, the electrode active material layer 12 and the solid electrolyte layer 30 are sequentially stacked by lamination coating in this order to obtain an electrode plate.

[0196] Next, prepare Figure 1 and Figure 2 The current collector 21 has the shape shown. Then, using a coating process, etc., to... Figure 1 and Figure 2The shape shown is achieved by stacking an insulating layer 23 on the current collector 21. On the entire surface of the current collector 21 with the insulating layer 23, the active material layer 22 of the counter electrode and the solid electrolyte layer 30 are sequentially stacked by lamination coating to obtain the counter electrode plate.

[0197] Next, the obtained electrode plate and counter electrode plate are stacked in such a way that their respective solid electrolyte layers 30 are in contact. The stacked body is pressed from both sides of the stacking direction using a flat plate press to obtain the battery 50.

[0198] Alternatively, a laminate can be formed by stacking an insulating layer 13, an insulating layer 23, and a power generation element 40 on a substrate of a current collector. If necessary, the laminate can be cut in the stacking direction at the location where the insulating layer 13 and the insulating layer 23 are separated, and the resulting laminate can be sandwiched between the current collector 11 and the current collector 21 to form a battery 50.

[0199] [Variation Example 1]

[0200] Hereinafter, a variation of Embodiment 1 will be described. It should be noted that in the following description of Variation 1 of Embodiment 1, the focus is on the differences from Embodiment 1, and the description of the commonalities is omitted or simplified.

[0201] Figure 9 This is a schematic cross-sectional view illustrating an example of the battery involved in this variation. (See attached image.) Figure 9 As shown, the battery 51 differs from the battery 50 of Embodiment 1 in that the side of the battery 51 is tilted relative to the stacking direction.

[0202] The battery 51 includes an electrode layer 10a, a counter electrode layer 20a disposed opposite to the electrode layer 10a, and a solid electrolyte layer 30a located between the electrode layer 10a and the counter electrode layer 20a.

[0203] Electrode layer 10a has a current collector 11a, an electrode active material layer 12a located between the current collector 11a and the solid electrolyte layer 30a, and an insulating layer 13a located at the end of electrode layer 10a between the current collector 11a and the electrode active material layer 12a. Counter electrode layer 20a has a current collector 21a, a counter electrode active material layer 22a located between the current collector 21a and the solid electrolyte layer 30a, and an insulating layer 23a located at the end of counter electrode layer 20a between the current collector 21a and the counter electrode active material layer 22a.

[0204] The side surface 51s of the battery 51, which connects the two main surfaces perpendicular to the stacking direction, is inclined relative to the stacking direction in a direction in which the area of ​​the counter electrode layer 20a, when viewed in plan view, is larger than the area of ​​the electrode layer 10a. In other words, the side surface 51s is inclined relative to the stacking direction in a direction in which the width of the counter electrode layer 20a in the cross-section where the battery 51 is cut in the stacking direction is larger than the width of the electrode layer 10a. That is, in the battery 51, the area of ​​the main surface 22s on the side of the counter electrode active material layer 12a is larger than the area of ​​the main surface 12s on the side of the counter electrode active material layer 22a. In addition, when viewed from the stacking direction, the main surface 12s is located inside the main surface 22s. In the battery 51, for example, the electrode layer 10a having the electrode active material layer 12a is a positive electrode layer having a positive electrode active material layer, and the counter electrode layer 20a having the counter electrode active material layer 22a is a negative electrode layer having a negative electrode active material layer. In this case, the area of ​​the negative electrode active material layer is larger than that of the positive electrode active material layer when viewed in a planar manner. Therefore, metal deposition is suppressed in battery 51.

[0205] Furthermore, during the side phase 51s, the side surface of the solid electrolyte layer 30a is also tilted relative to the stacking direction, thus increasing the exposed surface area of ​​the solid electrolyte layer 30a and lengthening the distance between the electrode active material layer 12a and the counter electrode active material layer 22a during the side phase 51s. Consequently, the electrode active material layer 12a and the counter electrode active material layer 22a are less likely to make contact, and short circuits are suppressed.

[0206] Additionally, all sides 51s of the battery 51, including those not shown in the diagram, are tilted relative to the stacking direction, and the area of ​​the main surface 22s is larger than the area of ​​the main surface 12s. It should be noted that not all sides 51s of the battery 51 need to be tilted relative to the stacking direction; at least one side 51s is sufficient.

[0207] Battery 51 is manufactured, for example, by cutting the battery 50 according to Embodiment 1 in a direction inclined relative to the stacking direction. Alternatively, battery 51 can also be manufactured by cutting it in a cutting step of the battery 50 manufacturing method in a direction inclined relative to the stacking direction. That is, the side surface 51s can be a cut surface. The shape of the cut surface of battery 51 is trapezoidal.

[0208] Figure 10 This is a diagram illustrating the cutting process in the battery manufacturing method involved in this variation. (See diagram for example.) Figure 10As shown, battery 51 is manufactured by cutting in the aforementioned cutting process in a direction inclined at an angle θ from the stacking direction. The angle θ is determined based on the width of the formed insulating layer and the desired battery characteristics. For example, angle θ is smaller than 45 degrees. Angle θ can also be 30 degrees or less. Furthermore, battery 50 is manufactured when angle θ is zero degrees. For example, if the battery thickness is 0.1 mm and the width of the insulating layer 13 from the side of the battery is 0.1 mm, if the angle of the cutting surface is larger than 45 degrees, the insulating layer 13 will be removed by cutting, and therefore the effect of the insulating layer 13 will not be obtained.

[0209] [Variation Example 2]

[0210] Hereinafter, a variation 2 of Embodiment 1 will be described. It should be noted that in the following description of variation 2 of Embodiment 1, the focus is on the differences from Embodiment 1, and the description of the commonalities is omitted or simplified.

[0211] Figure 11 This is a schematic top view illustrating an example of the battery involved in this variation. Figure 11 In the diagram, the planar shapes of the various components of a battery are represented by solid and dashed lines. Figure 12 This is a schematic side view showing an example of a battery involved in this variation. Figure 12 This is a plan view of the side of battery 52 along its long side, viewed from the front. For example... Figure 11 and Figure 12 As shown, battery 52 differs from battery 50 in embodiment 1 in that the insulating layer is formed in a striped pattern.

[0212] Battery 52 is constructed by replacing insulating layers 13 and 23 in battery 50 with insulating layers 13b and 23b whose planar shapes differ from those of insulating layers 13 and 23. Battery 52 includes an electrode layer 10b, a counter electrode layer 20b disposed opposite to the electrode layer 10b, and a solid electrolyte layer 30 located between the electrode layer 10b and the counter electrode layer 20b. Electrode layer 10b has a current collector 11, an electrode active material layer 12 located between the current collector 11 and the solid electrolyte layer 30, and an insulating layer 13b located at the end of electrode layer 10b between the current collector 11 and the electrode active material layer 12. Counter electrode layer 20b has a current collector 21, a counter electrode active material layer 22 located between the current collector 21 and the solid electrolyte layer 30, and an insulating layer 23b located at the end of counter electrode layer 20b between the current collector 21 and the counter electrode active material layer 22.

[0213] like Figure 11 and Figure 12As shown, insulating layer 13b and insulating layer 23b are respectively arranged along two opposite sides of the rectangular shape of the battery 52 when viewed from the plane. That is, insulating layer 13b and insulating layer 23b are respectively positioned in one direction (in... Figure 11 In the example, the two stripes extending along the long side (y-direction) of battery 52 when viewed from a plane are striped. Insulating layers 13b and 23b are not formed along the other two opposite sides of the rectangle that are orthogonal to the two opposite sides.

[0214] In this way, the insulating layer 13b and the insulating layer 23b are formed into a strip shape extending in one direction. Therefore, when the insulating layer 13b and the insulating layer 23b are formed by coating or the like, the coating nozzle or the current collector 11 and the current collector 21 can be moved in only one direction, and the battery 52 can be manufactured efficiently.

[0215] It should be noted that insulating layer 13b and insulating layer 23b may be arranged not along the two opposite sides of the rectangle extending in the long side direction when viewed in a plane, but along the two opposite sides extending in the short side direction of the rectangle.

[0216] [Variation Example 3]

[0217] Hereinafter, a variation 3 of Embodiment 1 will be described. It should be noted that in the following description of variation 3 of Embodiment 1, the focus is on the differences from Embodiment 1, and the description of the commonalities is omitted or simplified.

[0218] Figure 13 This is a schematic cross-sectional view illustrating an example of the battery involved in this variation. (See attached image.) Figure 13 As shown, battery 53 differs from battery 50 of embodiment 1 in that the width of the electrode-side insulating layer and the width of the counter-electrode-side insulating layer are the same.

[0219] Battery 53 is constructed by replacing the insulating layer 23 in battery 50 with an insulating layer 23c having a width different from that of the insulating layer 23. Battery 53 includes an electrode layer 10, a counter electrode layer 20c disposed opposite to the electrode layer 10, and a solid electrolyte layer 30 located between the electrode layer 10 and the counter electrode layer 20c. The counter electrode layer 20c has a current collector 21, a counter electrode active material layer 22 located between the current collector 21 and the solid electrolyte layer 30, and an insulating layer 23c located at the end of the counter electrode layer 20c between the current collector 21 and the counter electrode active material layer 22.

[0220] In battery 53, when viewed in a planar view, the length of insulating layer 13 in the direction from the outer periphery of battery 53 toward the center is the same as that of insulating layer 23c in the same direction. When viewed in a planar view, the area where insulating layer 13 is formed is the same as the area where insulating layer 23c is formed. Thus, in battery 53, insulating layer 13 and insulating layer 23c can be formed in the same shape on current collector 11 and current collector 21 respectively, making manufacturing easy.

[0221] (Implementation Method 2)

[0222] Next, Embodiment 2 will be described. In Embodiment 2, a stacked battery, which is a stacked battery composed of single cells such as batteries as described in Embodiment 1, will be described. It should be noted that in the following description, the focus will be on the differences from Embodiment 1 described above, and the description of commonalities will be omitted or simplified as appropriate.

[0223] [constitute]

[0224] First, the structure of the stacked battery according to Embodiment 2 will be described with reference to the accompanying drawings. Figure 14 This is a schematic cross-sectional view illustrating an example of a stacked battery according to this embodiment. Figure 14 As shown, the stacked battery 100 has a structure consisting of stacked single cells, which has the same structure as the battery 50 according to Embodiment 1. In other words, the stacked battery 100 is a stacked type battery consisting of multiple single cells stacked together.

[0225] The stacked battery 100 includes multiple batteries 50a. The uppermost battery 50a has the same configuration as battery 50. Furthermore, in the second and subsequent batteries 50a, the current collector of the counter electrode layer 20 is shared with the current collector 11 of one of the upper batteries 50a. For example, the current collector 11 of the uppermost battery 50a is the current collector in the electrode layer 10 of the uppermost battery 50a, and also the current collector in the counter electrode layer of the second battery 50a. In this embodiment, the current collector 11 is also an example of a counter electrode current collector. In the second and subsequent batteries 50a, the insulating layer 23 is located between the counter electrode active material layer 22 and the current collector 11, and the side surface of the insulating layer 23 is coplanar with the side surface of the current collector 11.

[0226] In the stacked battery 100, multiple batteries 50a are stacked such that the electrode layer 10 of one adjacent battery 50a and the counter electrode layer 20 of the other are face-to-face, or in other words, adjacent. Thus, the function of the current collector 11 is shared by the adjacent batteries 50a. Furthermore, through this stacking, the stacked battery 100 becomes a series-stacked type stacked battery. Therefore, a series-stacked type high-voltage stacked battery 100 exhibiting the same effects as the battery 50 according to Embodiment 1 can be achieved.

[0227] exist Figure 14 In the example shown, the number of stacked batteries 50a is 5, but it can also be more than 2 and less than 4, or even more than 6.

[0228] The side surface of the stacked battery 100 is, for example, a cut surface. Alternatively, the side surface of the stacked battery 100 is a flat plane. In other words, the side surfaces of the multiple batteries 50a are coplanar. In the side surface of the stacked battery 100, each layer may be exposed, and sealing members or the like may be provided on the exposed side. Figure 15 This is a schematic cross-sectional view illustrating other examples of the stacked battery involved in this embodiment. For example... Figure 15 As shown, the stacked battery 100a has a structure in which the sides, for example, all sides, of the stacked battery 100 are covered by the sealing member 60. That is, the stacked battery 100a includes the stacked battery 100 and the sealing member 60, and the sides of each layer constituting the stacked battery 100 are covered by the sealing member 60. Therefore, in the stacked battery 100a, the sides of each layer are not directly exposed to the outside, thus increasing the strength and reliability of the stacked battery 100a. Furthermore, by protecting the stacked battery 100a with the sealing member 60, the stacked battery 100a can be used not only in applications such as encapsulating it in a metal casing or aluminum laminate, but also, for example, in applications such as mounting electronic components onto a substrate.

[0229] The sealing member 60 is, for example, in contact with the side of the stacked battery 100. The sealing member 60 of the stacked battery 100a can be formed, for example, by placing the stacked battery 100 with its side facing upwards and applying the sealing member to the side from above using a dispenser or the like. As the material for the sealing member 60, a known material for battery (e.g., lithium-ion all-solid-state battery) sealing members, such as a thermosetting resin, can be used. Such a sealing member material can impart properties such as water resistance and impact resistance. Alternatively, the sealing member 60 can also be composed of multiple layers of sealing members. In this case, the materials of the multiple layers can be the same or different.

[0230] [Manufacturing Method]

[0231] Next, the manufacturing method of the stacked battery according to this embodiment will be described. It should be noted that the manufacturing method of the stacked battery 100 described below is just one example, and the manufacturing method of the stacked battery 100 is not limited to the following example.

[0232] The manufacturing method of the stacked battery 100 is the same as that of the battery 50, including an insulating layer stacking process, a power generation element stacking process, a current collector stacking process, and a cutting process. The stacked battery 100 is a battery having multiple power generation element sections 40; therefore, the manufacturing method of the stacked battery 100 can also be described as a manufacturing method of a battery having multiple power generation element sections 40. The following is a detailed description of each process.

[0233] (1) Insulation layer lamination process

[0234] First, the process of laminating the insulating layer will be explained. Figure 16 This is a flowchart illustrating the manufacturing method of the stacked battery involved in this embodiment.

[0235] In the insulation layer lamination process, firstly, multiple current collectors 11 are prepared. Figure 16 Step S21). Then, an insulating layer 13 is formed on one side of each of the prepared plurality of current collectors 11, and an insulating layer 23 is formed on the other side. Figure 16 (Step S22). In the formation of insulating layer 13 and insulating layer 23, insulating layer 13 and insulating layer 23 are stacked on current collector 11 using the same method as in S12 described above. In the formation of insulating layer 13 and insulating layer 23, for example, the overlapping positions of insulating layer 13 and insulating layer 23 when viewed in a plane are formed with the same pattern. In addition, the width of insulating layer 13 is larger than the width of insulating layer 23 when viewed in a plane. That is, insulating layer 13 and insulating layer 23 are formed such that the area of ​​insulating layer 13 is larger than the area of ​​insulating layer 23 when viewed in a plane. In addition, for example, insulating layer 13 and insulating layer 23 are formed such that the entire insulating layer 23 of the region where the stacked battery 100 is finally formed overlaps with insulating layer 13 when viewed in a plane.

[0236] (2) Power generation element stacking process

[0237] Next, the power generation element stacking process will be described. In the manufacturing method according to this embodiment, the power generation element stacking process includes a first stack forming process and a first stack stacking process. In the first stack forming process, multiple stacked electrode plates are formed by stacking power generation element portions 40 on multiple current collectors 11 on which insulating layers 13 and insulating layers 23 are stacked, such that the electrode active material layer 12 is covered with an insulating layer 13. Figure 17 This is a schematic cross-sectional view illustrating an example of a laminated electrode plate according to this embodiment. Figure 17 As shown, on each of the plurality of current collectors 11 having an insulating layer 13 and an insulating layer 23 stacked together, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are sequentially stacked in this order. Figure 16Steps S23, S24, and S25). At this time, the electrode active material layer 12 is stacked onto the surface of the current collector 11 where the insulating layer 13 is formed. Thus, a stacked electrode plate 42 is formed. Furthermore, as needed, the electrode active material layer 12, the solid electrolyte layer 30, and the electrode active layer 22 stacked in steps S23, S24, and S25 are subjected to high-pressure pressing treatment respectively. Figure 16 (Step S26). Additionally, as needed, the electrode active material layer 12, the solid electrolyte layer 30, and the counter-electrode active material layer 22, which are stacked in steps S23, S24, and S25, are subjected to heat treatment respectively. In steps S23, S24, S25, and S26, the same methods as in steps S13, S14, S15, and S16 described above can be used.

[0238] Next, in the first stacking process, multiple stacked electrode plates 42 are stacked in such a way that the positions of the insulating layers 13 of the multiple stacked electrode plates 42 formed in the first stacking process overlap when viewed in planar view, thereby forming a multilayer electrode plate. Figure 16 Step S27). Figure 18 This diagram illustrates the processes following the first layer stacking step in the manufacturing method of the stacked battery according to this embodiment. Figure 18 As shown, in the first lamination process, a multilayer electrode plate 45 is formed by stacking multiple laminated electrode plates 42. Figure 18 As shown, in the first laminated body lamination process, multiple laminated plates 42 are laminated such that the counter electrode active material layer 22 of one of the adjacent laminated plates 42 faces the current collector 11 of the other. That is, multiple laminated plates 42 are laminated in such a way that the insulating layer 23 of the current collector 11 laminated on the other is sandwiched between the counter electrode active material layer 22 of one of the adjacent laminated plates 42 and the current collector 11 of the other. Then, for example, the multiple laminated plates 42 are joined together by a pressing process that presses them from both sides of the lamination direction after lamination to form a multilayer plate 45. In the multilayer plate 45, the current collector 11 of the upper laminated plate 42 and the counter electrode active material layer 22 of the lower laminated plate 42 are in contact. In addition, the insulating layer 23 of the upper layered electrode 42 of the adjacent layered electrode 42 is located between the current collector 11 of the upper layered electrode 42 and the counter electrode active material layer 22 of the lower layered electrode 42.

[0239] When the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are subjected to high-pressure pressing during the formation of the multilayer electrode plate 42, high-pressure pressing is not required during the pressing process when forming the multilayer electrode plate 45. For example, the pressure of the pressing process used to join the multilayer electrode plates 42 together in step S27 is lower than the pressure of the high-pressure pressing process in step S26. As a result, the multilayer electrode plate 45 can be formed without damaging the interfaces formed in the first laminate formation process.

[0240] (3) Current collector stacking and cutting process

[0241] Next, the current collector stacking process and the cutting process will be explained. In the current collector stacking process, an additional current collector with an insulating layer formed on the electrode side is stacked onto a multilayer electrode plate. Figure 16 Step S28). For example, as Figure 18 As shown, in the multilayer electrode plate 45, an insulating layer 23 is formed on the surface of the power generation element portion 40 of the uppermost multilayer electrode plate 42 (a multilayer electrode plate 42 on which no other multilayer electrode plates 42 are stacked) opposite to the current collector 11 side. At this time, for example, the current collector 21 with the insulating layer 23 is formed by bonding the exposed counter electrode active material layer 22 of the uppermost multilayer electrode plate 42 through a pressing process or the like. The pressing process is performed, for example, at a pressure lower than the high-pressure pressing process in step S26. Furthermore, the current collector 21 with the insulating layer 23 is formed by stacking the counter electrode active material layer 22 of the uppermost multilayer electrode plate 42 and the current collector 21 together.

[0242] The current collector 21 with the insulating layer 23 is formed, for example, by the method described in step S17 above. For example, the insulating layer 23 is formed on the current collector 21 in such a way that its shape and position when viewed in plan view are the same as those of the insulating layer 23 formed on the current collector 11. Furthermore, the current collector 21 with the insulating layer 23 is formed by stacking multiple electrode plates 45 in such a way that the insulating layer 13 and the insulating layer 23 are located in overlapping positions when viewed in plan view. For example, the current collector 21 with the insulating layer 23 is formed by stacking multiple electrode plates 45 in such a way that the entire insulating layer 23 of the region that ultimately forms the stacked battery 100 when viewed in plan view overlaps with the insulating layer 13.

[0243] Next, in the cutting process, the multilayer electrode plate 45, on which the current collector 21 with the insulating layer 23 is formed, is stacked in the current collector stacking process and cut in the stacking direction at the position where the insulating layer 13 and the insulating layer 23 are separated. Figure 16 Step S29). Figure 18As shown, for example, at the positions of dashed lines C5, C6, C7, and C8 where insulating layers 13 and 23 are disposed, the multilayer electrode 45, on which the current collector 21 with insulating layer 23 is stacked, is cut using a tool or laser. Thus, a result is obtained. Figure 14 The stacked battery 100 is shown. In Figure 18 An insulating layer 23 is formed on the lower surface of the current collector 11 at the lowest side of the multilayer plate 45 shown. However, the multilayer battery 100 can be formed by removing the insulating layer 23, or the multilayer battery 100 can be used with the insulating layer 23 remaining.

[0244] At positions C5, C6, C7, and C8 (dashed lines), multiple stacked electrode plates 42 are laminated and then cut off together. By cutting off multiple stacked electrode plates 42 together in this way, it is not necessary to laminate them after manufacturing the cut single cell shape, thus significantly reducing the number of times the power generation element section 40 is laminated in the power generation element lamination process. As a result, it is possible to efficiently manufacture a laminated battery 100.

[0245] It should be noted that, prior to the current collector stacking process, an insulating layer 23 may be formed on the upper surface of the counter electrode active material layer 22 in the uppermost stacked electrode plate 42 of the multilayer electrode plate 45, at a position where it overlaps with the insulating layer 13 when viewed in plan view. In this case, after the current collector 21 is stacked on the multilayer electrode plate 45 with the insulating layer 23 formed, a cutting process is performed.

[0246] Thus, by using the battery manufacturing method according to this embodiment, a high-voltage battery 100 of series stacked type can be manufactured.

[0247] [Variation Example 1]

[0248] Hereinafter, a variation 1 of Embodiment 2 will be described. It should be noted that in the following description of Variation 1 of Embodiment 2, the description will focus on the differences from Embodiment 1 and Embodiment 2, and the description of the commonalities will be omitted or simplified.

[0249] The manufacturing method of the stacked battery according to this modification will be described. The manufacturing method of the stacked battery according to this modification differs from the manufacturing method of the stacked battery according to Embodiment 2 in that it uses a current collector 11 with insulating layers 13 stacked on both sides and a current collector 21 with insulating layers 23 stacked on both sides to manufacture a parallel stacked battery.

[0250] First, in the insulating layer lamination process, insulating layers 13 are laminated on both sides of the current collector 11. The positions of the insulating layers 13 laminated on both sides are the same when viewed in a plane. The method for laminating the insulating layers 13 on the current collector 11 can use the same method as steps S11 and S12 described above. For example, in Figure 6A , Figure 6B or Figure 6C The surfaces of the current collector 11, which are shown to have an insulating layer 13, also have an insulating layer 13 stacked on them.

[0251] An insulating layer 23 is stacked on both sides of the current collector 21. For example, using the same method as when an insulating layer 13 is stacked on both sides of the current collector 11, the insulating layer 23 is formed on both sides of the current collector 21 in accordance with the shape of the insulating layer 23. The shape of the insulating layer 23 at this time is, for example, the same pattern as the insulating layer 13 described above, but with a width narrower than the insulating layer 13. That is, the insulating layer 23 is stacked in such a way that the area of ​​the insulating layer 23 is smaller than the area of ​​the insulating layer 13 when viewed in a plane.

[0252] Next, the process of stacking power generation elements is carried out. Figure 19 and Figure 20 This is a schematic cross-sectional view showing an example of a laminated electrode plate involved in this variation. Figure 21 This is a schematic cross-sectional view illustrating an example of a multilayer electrode plate according to this modification. In the power generation element stacking process according to this modification, for example, forming... Figure 19 The laminated electrode 43a with insulating layer 13 shown and Figure 20 The laminated electrode 43b shown has an insulating layer 23.

[0253] First, such as Figure 19 As shown, a multilayer electrode plate 43a is formed by sequentially layering and coating an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22 on one side of a current collector 11 on both sides, where an insulating layer 13 is stacked on each side. In other words, the power generation element 40 is stacked on one side of the current collector 11 on both sides, such that the electrode active material layer 12 of the power generation element 40 is covered with an insulating layer 13. The multilayer electrode plate 43a has a structure in which the electrode active material layer 12 is covered with the insulating layer 13.

[0254] In addition, such as Figure 20 As shown, a multilayer electrode plate 43b is formed by sequentially layering and coating the counter electrode active material layer 22, the solid electrolyte layer 30, and the electrode active material layer 12 on one side of a current collector 21 on both sides, where the insulating layer 23 is stacked on both sides. In other words, the power generation element 40 is stacked on one side of the current collector 21 on both sides, such that the counter electrode active material layer 22 of the power generation element 40 is covered with the insulating layer 23. The multilayer electrode plate 43b has a coating structure where the counter electrode active material layer 22 is covered with the insulating layer 23.

[0255] In the stacking of the power generation element 40 of the stacked electrode plates 43a and 43b, the same method as steps S13, S14, and S15 described above can be used. Furthermore, if necessary, the stacked electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22 are subjected to high-pressure pressing. Additionally, if necessary, the stacked electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22 are subjected to heat treatment.

[0256] Next, as Figure 21 As shown, a multilayer electrode plate 47 is formed by alternately stacking the multilayer electrode plates 43a and 43b, such that the electrode active material layer 12 of the power generation element portion 40 of the multilayer electrode plate 43b covers the insulating layer 13 of the multilayer electrode plate 43a. Furthermore, the insulating layer 23 of the multilayer electrode plates 43b other than the bottommost multilayer electrode plate 43b is covered by the counter electrode active material layer 22 of the power generation element portion 40 of the multilayer electrode plate 43a. In the formation of the multilayer electrode plate 47, the multilayer electrode plates 43a and 43b are alternately stacked such that, when viewed in planar view, the positions of the insulating layers 13 of each of the multiple multilayer electrode plates 43a and the positions of the insulating layers 23 of each of the multiple multilayer electrode plates 43b completely overlap. Additionally, for example, the multilayer electrode plates 43a and 43b are alternately stacked such that, when viewed in planar view, the entire insulating layer 23 of the region where the multilayer battery 102 is ultimately formed overlaps with the insulating layer 13. By pressing the stacked electrode plates 43a and 43b from both sides of the stacking direction, the stacked electrode plates 43a and 43b are joined together to form a multilayer electrode plate 47.

[0257] The multilayer electrode plate 47 has a structure in which a current collector 11 with insulating layers 13 stacked on both sides, two power generation element sections 40, and a current collector 21 with insulating layers 23 stacked on both sides are stacked. Furthermore, the multilayer electrode plate 47 has a structure in which the current collector 11 is sandwiched between the two power generation element sections 40 such that the electrode active material layer 12 is coated with the insulating layers 13 stacked on both sides of the current collector 11, and one of the two power generation element sections 40 is sandwiched between the current collector 11 with insulating layers 13 stacked on both sides and the current collector 21 with insulating layers 23 stacked on both sides. Although details will be described later, on the side of the uppermost power generation element section 40 opposite to the side of the current collector 11, a current collector 21 with an insulating layer 23 stacked on one side is stacked.

[0258] It should be noted that in this modified example, in the multilayer electrode plate 47, the stacked electrode plates 43a and 43b are stacked alternately in 3 groups, but there may also be more than 1 group and less than 2 groups, or more than 4 groups.

[0259] Next, a current collector stacking process is performed. In this process, a current collector 21 with an insulating layer 23 is stacked on the side of the power generation element 40 in the multilayer electrode 47 where the current collector 11 is not stacked, as an additional current collector. Specifically, as follows... Figure 21 As shown, in the multilayer electrode plate 47, the surface of the power generation element part 40 in the uppermost multilayer electrode plate 43a, which is opposite to the current collector 11 side, is joined by a current collector 21 with an insulating layer 23 through pressing or the like.

[0260] Next, a cutting process is performed. In this cutting process, the multilayer electrode plate 47, on which the current collector 21 with the insulating layer 23 is formed, is cut in the stacking direction at the location where the insulating layer 13 and the insulating layer 23 are separated. For example... Figure 21 As shown, for example, at the positions of dashed lines C9, C10, C11, and C12 where insulating layers 13 and 23 are disposed, the multilayer electrode plate 47 on which the current collector 21 with insulating layer 23 is stacked is cut using a knife or laser. At the positions of dashed lines C9, C10, C11, and C12, multiple stacked electrode plates 43a and multiple stacked electrode plates 43b are stacked, and they are cut together. Figure 22 This is a schematic cross-sectional view showing an example of a stacked battery involved in this variation. After such a cutting process, the following is obtained: Figure 22 The stacked battery 102 is shown. In Figure 21 An insulating layer 23 is formed on the lower surface of the current collector 21 at the bottom of the multilayer plate 47 shown. However, the multilayer battery 102 can be formed by removing the insulating layer 23, or the multilayer battery 102 can be used with the insulating layer 23 remaining.

[0261] like Figure 22 As shown, the stacked battery 102 includes a plurality of batteries 50c. Among the plurality of batteries 50c, except that at least one of the current collectors 11 and 21 is shared by adjacent batteries 50c, the configuration is the same as that of the battery 50 according to Embodiment 1.

[0262] In the stacked battery 102, the electrode layers 10 of adjacent batteries 50c share current collectors 11 or 21 with each other or with each other. That is, for the current collectors 11 shared by adjacent batteries 50c, electrode active material layers 12 are stacked on both sides; for the current collectors 21 shared by adjacent batteries 50c, counter electrode active material layers 22 are stacked on both sides. Therefore, the multiple batteries 50c are stacked such that the electrode layers 10 of adjacent batteries 50c are adjacent to each other or the counter electrode layers 20 are adjacent to each other. Thus, the stacked battery 102 becomes a parallel-connected stacked battery. To extract current, the current collectors 21 are electrically connected to each other, and the current collectors 11 are electrically connected to each other, thereby functioning as a parallel-connected stacked battery.

[0263] The side surface of the stacked battery 102 is a cut surface formed by the manufacturing method described above. Furthermore, the side surfaces of each of the multiple batteries 50c are coplanar. That is, a flat plane is formed on the side surface of the stacked battery 102. In the side surface of the stacked battery 102, each layer may be exposed, or sealing members may be provided.

[0264] Thus, by using the manufacturing method of the stacked battery according to this variation, it is possible to manufacture a parallel stacked high-capacity stacked battery 102 that exhibits the same effects as the battery 50 according to Embodiment 1.

[0265] (Implementation Method 3)

[0266] The stacked battery according to Embodiment 3 will be described below. It should be noted that in the following description of Embodiment 3, the focus is on the differences from Embodiments 1 and 2, and the description of the commonalities is omitted or simplified.

[0267] Figure 23 This is a cross-sectional view showing a schematic configuration of an example of a stacked battery according to this embodiment. Figure 23 As shown, the stacked battery 104 includes multiple batteries 50 according to Embodiment 1, and has a structure in which multiple batteries 50 are stacked. The multiple batteries 50 are stacked such that the vertical orientation of the batteries 50 is the same. The multiple batteries 50 are stacked such that the electrode layer 10 of one battery 50 and the counter electrode layer 20 of the other battery 50 adjacent in the stacking direction are face-to-face and electrically connected. That is, the stacked battery 104 is a series-stacked type stacked battery. Therefore, a high-voltage stacked battery 104 can be realized using the batteries 50 according to Embodiment 1.

[0268] The sides of the stacked battery 104 are flat planes; in other words, the sides of each of the multiple batteries 50 are coplanar. It should be noted that the multiple batteries 50 can also be stacked in a staggered manner in a direction perpendicular to the stacking direction for connecting leads, etc.

[0269] The number of stacked batteries 50 is 3 in the example shown in the illustration, but it can also be 2 or more.

[0270] The stacked battery 104 is manufactured, for example, by stacking multiple batteries 50 such that the electrode layer 10 of one battery 50 and the counter electrode layer 20 of the other battery 50, which are adjacent in the stacking direction, face to face. Alternatively, it can be manufactured by... Figure 8 The stacked battery 104 is manufactured by stacking multiple stacked electrode plates 41 with current collectors 21 having insulating layers 23 before cutting. The stacked plates 41 are then cut in the stacking direction at the position where the insulating layers 13 and 23 are separated.

[0271] The stacked cell 104 is a series-stacking type stacked cell, but it can also be a parallel-stacking type stacked cell with a structure in which the electrode layers of adjacent single cells are stacked face-to-face or the counter electrode layers are stacked face-to-face. In the parallel-stacking type stacked cell, a high-capacity stacked cell can be realized. Figure 24 This is a cross-sectional view illustrating the schematic configuration of other examples of the stacked battery involved in this embodiment. For example... Figure 24 As shown, the stacked battery 105 includes multiple batteries 50 according to Embodiment 1, which are stacked together. The multiple batteries 50 are stacked such that the vertical orientation of the batteries 50 is alternately reversed in stacking order. The multiple batteries 50 have a structure in which the electrode layers 10 of adjacent batteries 50 in the stacking direction are stacked in a manner such that the counter electrode layers 20 are adjacent to each other without a solid electrolyte layer 30 sandwiched in between. The stacked battery 105 is a parallel-stacked type stacked battery. Therefore, by electrically connecting the electrode layers 10 to each other and the counter electrode layers 20 to each other, a high-capacity stacked battery 105 can be realized using the batteries 50 according to Embodiment 1.

[0272] The sides of the stacked battery 105 are flat planes; in other words, the sides of each of the multiple batteries 50 are coplanar. It should be noted that the multiple batteries 50 can also be stacked in a staggered manner in a direction perpendicular to the stacking direction for connecting leads, etc.

[0273] The number of stacked batteries 50 is 6 in the example shown, but it can also be more than 2 and less than 5, or even more than 7.

[0274] The stacked battery 105 can be manufactured, for example, by adjusting the orientation of the battery 50 during stacking using the same method as the stacked battery 104 described above.

[0275] In addition, the stacked battery described in this embodiment may also be provided with sealing components and terminals, etc. Figure 25 This is a schematic cross-sectional view showing yet another example of the stacked battery involved in this embodiment.

[0276] like Figure 25 As shown, the stacked battery 105a has a structure in which the sides of the stacked battery 105 are covered by a sealing member 61, an electrode terminal 70a, and a counter electrode terminal 70b. In other words, the stacked battery 105a includes a stacked battery 105, a sealing member 61, electrode terminals 70a, and counter electrode terminals 70b. By providing electrode terminals 70a and counter electrode terminals 70b for current extraction on the sides of the stacked battery 105, there is no need to form so-called "excess" current collectors 11 and 21 for connection to leads or other connection terminals, thus further improving the volumetric energy density of the stacked battery 105a.

[0277] Electrode terminal 70a is connected to the side surface of the current collector 11 and insulating layer 13 in the electrode layer 10 of each of the plurality of batteries 50. Electrode terminal 70a continuously covers the side surface of the current collector 11 and insulating layer 13 in the electrode layer 10 of each of the plurality of batteries 50. Figure 25 In the example shown, electrode terminal 70a is connected to the side surfaces of the current collector 11 and insulating layer 13 of each of the two electrode layers 10 of the plurality of batteries 50 that are adjacent to each other in such a way that the electrode layers 10 are adjacent to each other. Electrode terminal 70a continuously covers the side surfaces of the current collector 11 and insulating layer 13 of each of the two electrode layers 10 of the plurality of batteries 50 that are adjacent to each other in such a way that the electrode layers 10 are adjacent to each other. One or more electrode terminals 70a are provided depending on the number of stacks of the plurality of batteries 50 in the stacked battery 105. In addition, electrode terminal 70a is not connected to the counter electrode layer 20 of each of the plurality of batteries 50.

[0278] The counter electrode terminal 70b is in contact with the side surfaces of the current collector 21 and the insulating layer 23 in the counter electrode layer 20 of each of the plurality of batteries 50. The counter electrode terminal 70b continuously covers the side surfaces of the current collector 21 and the insulating layer 23 in the counter electrode layer 20 of each of the plurality of batteries 50. Figure 25 In the example shown, the counter electrode terminal 70b is in contact with the sides of the current collector 21 and insulating layer 23 of each of the two counter electrode layers 20 of the plurality of batteries 50 that are adjacent to each other in such a way that the counter electrode layers 20 are adjacent to each other. The counter electrode terminal 70b continuously covers the sides of the current collector 21 and insulating layer 23 of each of the two counter electrode layers 20 of the plurality of batteries 50 that are adjacent to each other in such a way that the counter electrode layers 20 are adjacent to each other. More than one counter electrode terminal 70b is provided depending on the number of stacks of the plurality of batteries 50 in the stacked battery 105. In addition, the counter electrode terminal 70b is not in contact with the electrode layer 10 of each of the plurality of batteries 50.

[0279] The materials used for electrode terminals 70a and counter electrode terminals 70b are, for example, conductive resin in which metal particles are dispersed. Electrode terminals 70a and counter electrode terminals 70b are formed, for example, by coating conductive resin onto the sides of the stacked cell 105. The plurality of cells 50 constituting the stacked cell 105 include insulating layers 13 and 23. Current collectors 11 and 21 are made of metal foil or the like, thus having high surface energy and easily repelling the materials of electrode terminals 70a and counter electrode terminals 70b. Insulating layers 13 and 23, for example, contain resin or the like, therefore the wettability of the materials of electrode terminals 70a and counter electrode terminals 70b is better than that of current collectors 11 and 21. Furthermore, compared to electrode active material layers 12 and counter electrode active material layers 22 formed from an active material mixture, the materials of electrode terminals 70a and counter electrode terminals 70b are less likely to penetrate into insulating layers 13 and 23. Therefore, it is difficult to form electrode terminals 70a and counter electrode terminals 70b on the sides of a stacked battery consisting only of current collector 11, current collector 21, electrode active material layer 12, and counter electrode active material layer 22. However, electrode terminals 70a and counter electrode terminals 70b are easily formed in the regions including the sides of insulating layer 13 and insulating layer 23. Furthermore, if the thickness of current collector 11 and current collector 21 is reduced to increase the volumetric energy density of the stacked battery 105a, the positions of the sides of current collector 11 and current collector 21 are difficult to identify. However, since insulating layer 13 and insulating layer 23 are respectively stacked on current collector 11 and current collector 21, the positions of the sides of current collector 11 and current collector 21 are easily identified. Thus, it is possible to suppress short circuits caused by misalignment of the formation positions of electrode terminals 70a, counter electrode terminals 70b, and sealing member 61. Based on the above, when the electrode terminal 70a and the counter electrode terminal 70b are formed in the stacked cell 105, the occurrence of poor formation of the electrode terminal 70a and the counter electrode terminal 70b can be suppressed, and a stacked cell 105a with high reliability can be formed.

[0280] It should be noted that the electrode terminal 70a and the counter electrode terminal 70b can also be made of conductive materials other than conductive resins such as solder, copper, aluminum and other metals.

[0281] The sealing member 61 covers the side of the laminated battery 105 that is not covered by the electrode terminals 70a and counter electrode terminals 70b. The sealing member 61 is, for example, in contact with the side of the laminated battery 105. The surfaces of the electrode terminals 70a and counter electrode terminals 70b opposite to the side of the laminated battery 105 are exposed and not covered by the sealing member 61. For example, the entire side of the laminated battery 105 is covered by any one of the sealing member 61, the electrode terminals 70a, and the counter electrode terminals 70b. Therefore, in the laminated battery 105a, the side surfaces of each layer are not directly exposed to the outside, thus increasing the strength and reliability of the laminated battery 105a. Furthermore, the laminated battery 105a can be used not only for sealing into a metal casing or aluminum laminate, but also, for example, as for electronic components mounted on a substrate.

[0282] The sealing member 61 can be made of the same material as the sealing member 60 described above. The sealing member 61 can also be composed of multiple layers, just like the sealing member 60.

[0283] It should be noted that the sealing member 61 may not completely cover the sides not covered by the electrode terminals 70a and 70b. For example, the sealing member 61 may cover the sides of the electrode layer 10 and 20 not covered by the electrode terminals 70a and 70b, leaving the sides of the solid electrolyte layer 30 exposed. Thus, the sides of the electrode layer 10 and 20 are covered by the sealing member 61, suppressing short circuits. Even when the sealing member 61 is selectively formed on the sides of the electrode layer 10 and 20, the formation defects of the sealing member 61 can be suppressed for the same reasons as with the electrode terminals 70a and 70b, thus enabling the formation of a highly reliable stacked battery 105a. Alternatively, the stacked battery 105a may not have the sealing member 61.

[0284] In addition, in the stacked battery 105a, leads can be connected to the electrode terminal 70a and the counter electrode terminal 70b, and the leads, electrode terminal 70a and counter electrode terminal 70b can be further covered by the sealing member 61.

[0285] Furthermore, regarding the stacked battery 102 according to Embodiment 2, the same effect as the stacked battery 105a can be obtained by providing such a sealing member 61, electrode terminal 70a and counter electrode terminal 70b on the side.

[0286] By stacking the battery 50 as a single cell in this way, it is possible to achieve a stacked battery with high capacity or high voltage that can exhibit the same effect as the battery 50.

[0287] It should be noted that in the stacked battery 104 and stacked battery 105, multiple batteries 50 are stacked, but the stacked battery involved in this embodiment is not limited to this configuration. The stacked battery involved in this embodiment may also be a series-stacked or parallel-stacked battery consisting of multiple batteries other than batteries 50, such as batteries 51, batteries 52, or batteries 53.

[0288] (Other implementation methods)

[0289] The present disclosure has described the battery, stacked battery, and manufacturing method thereof based on the embodiments described above, but the present disclosure is not limited to these embodiments. Various modifications conceived by those skilled in the art to the embodiments, and other methods of constructing by combining some of the constituent elements of the embodiments, are also included within the scope of the present disclosure, provided they do not depart from the spirit of the present disclosure.

[0290] In the above embodiments, the battery is composed of a current collector, an insulating layer, an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer, but is not limited thereto. For example, within the limits of battery characteristics, bonding layers for reducing resistance and improving bonding strength may be provided between the layers of the battery.

[0291] Alternatively, for example, in the above embodiments, when the battery is surrounded by a casing or substrate and a portion of the casing or substrate functions as a current collector, a current collector on the counter electrode active material layer side of the battery may not be present. In other words, the counter electrode layer may also be composed of a counter electrode active material layer.

[0292] Furthermore, in the above embodiments, the current collector, the electrode active material layer, the solid electrolyte layer, and the counter electrode active material layer have the same shape and position when viewed in a plane, but this is not a limitation. Alternatively, at least one of the current collector, the electrode active material layer, the solid electrolyte layer, and the counter electrode active material layer may have different shapes or positions when viewed in a plane.

[0293] Furthermore, in the above embodiments, in the power generation element stacking process, the power generation element is formed by sequentially stacking the electrode active material layer, the solid electrolyte layer, and the counter electrode active material layer onto the current collector, but is not limited to this. For example, in the power generation element stacking process, the power generation element can also be formed by sequentially stacking the electrode active material layer, the solid electrolyte layer, and the counter electrode active material layer onto a sheet-like substrate, and then removing the formed power generation element from the substrate and stacking it onto the current collector.

[0294] Furthermore, the above-described embodiments can be modified, substituted, added, omitted, etc., within the scope of the claims or their equivalents.

[0295] Industrial availability

[0296] The batteries disclosed herein can be used, for example, as secondary batteries such as all-solid-state batteries used in various electronic devices or automobiles.

[0297] Explanation of reference numerals in the attached figures

[0298] 10, 10a, 10b electrode layers

[0299] 11, 11a, 21, 21a collectors

[0300] 12, 12a Electrode Active Material Layer

[0301] 12s, 22s main face

[0302] Insulation layers 13, 13a, 13b, 23, 23a, 23b, 23c

[0303] 20, 20a, 20b, 20c counter electrode layers

[0304] 22, 22a Electrode active material layer

[0305] 30, 30a solid electrolyte layer

[0306] 40 Power Generation Elements Department

[0307] 41, 41a, 41b, 42, 43a, 43b laminated electrode plates

[0308] 45, 47 multilayer plates

[0309] 50, 50A, 50C, 51, 52, 53 batteries

[0310] 100, 100a, 102, 104, 105, 105a stacked batteries

[0311] 51s side view

[0312] 60, 61 Sealing components

[0313] 70a electrode terminal

[0314] 70b electrode terminals

Claims

1. A battery, comprising: Electrode layer; The electrode layer is disposed opposite to the electrode layer; and A solid electrolyte layer is located between the electrode layer and the counter electrode layer. The electrode layer has: Electrode current collector; An electrode active material layer is located between the electrode current collector and the solid electrolyte layer; and An electrode-side insulating layer is located at the end of the electrode layer between the electrode current collector and the electrode active material layer. The counter electrode layer has: Counter electrode current collector; The counter electrode active material layer is located between the counter electrode current collector and the solid electrolyte layer; and An insulating layer on the counter electrode side is located at the end of the counter electrode layer between the counter electrode current collector and the counter electrode active material layer. When viewed in a plane, the length of the electrode-side insulating layer in the direction from the outer periphery of the battery toward the center is greater than the length of the counter electrode-side insulating layer in the same direction.

2. The battery according to claim 1, The side surface of the electrode insulating layer and the side surface of the electrode current collector are coplanar. The side surface of the insulating layer on the counter electrode side and the side surface of the counter electrode current collector are coplanar.

3. The battery according to claim 1 or 2, The thickness of the insulating layer on the electrode side is more than half the thickness of the electrode current collector. The thickness of the insulating layer on the counter electrode side is more than half the thickness of the counter electrode current collector.

4. The battery according to claim 1 or 2, The electrode layer is a positive electrode layer. The counter electrode layer is a negative electrode layer.

5. The battery according to claim 1 or 2, At least one of the electrode-side insulating layer and the counter-electrode-side insulating layer comprises a resin.

6. The battery according to claim 1 or 2, At least one of the electrode-side insulating layer and the counter-electrode-side insulating layer comprises a metal oxide.

7. The battery according to claim 1 or 2, The electrode-side insulating layer and the counter electrode-side insulating layer are made of the same material.

8. The battery according to claim 1 or 2, When viewed in a plane, the length of each of the electrode-side insulating layer and the counter electrode-side insulating layer from the outer periphery of the battery toward the center is less than 1 mm.

9. The battery according to claim 1 or 2, The thickness of at least one of the electrode-side insulating layer and the counter electrode-side insulating layer is 5 μm or more.

10. The battery according to claim 1 or 2, The solid electrolyte layer, the electrode current collector, the electrode active material layer, the electrode side insulating layer, the counter electrode current collector, the counter electrode active material layer, and the counter electrode side insulating layer are each exposed on their respective sides.

11. The battery according to claim 1 or 2, The side surfaces of the electrode layer, the counter electrode layer, and the solid electrolyte layer are coplanar.

12. The battery according to claim 1 or 2, When viewed in a plane, the electrode active material layer and the counter electrode active material layer have the same shape and position.

13. The battery according to claim 1 or 2, The side of the battery is tilted relative to the stacking direction in a direction in which the area of ​​the counter electrode layer is larger than the area of ​​the electrode layer when viewed in a plane.

14. The battery according to claim 1 or 2, The side of the battery is a cut surface.

15. The battery according to claim 14, The cut surface is rectangular or trapezoidal in shape.

16. The battery according to claim 1 or 2, When viewed in planar view, the electrode-side insulating layer is located on the outer periphery of the electrode layer and is frame-shaped. The insulating layer on the counter electrode side is located on the outer periphery of the counter electrode layer and is frame-shaped when viewed in a plane.

17. The battery according to claim 1 or 2, The battery has a rectangular shape when viewed from a planar perspective. The electrode-side insulating layer and the counter electrode-side insulating layer are respectively arranged along the two opposite sides of the rectangle when viewed in a plane.

18. The battery according to claim 1 or 2, The solid electrolyte layer contains a solid electrolyte that is lithium-ion conductive.

19. A stacked battery, The battery comprising any one of claims 1 to 18 Multiple of the aforementioned batteries are stacked.

20. The stacked battery according to claim 19, Multiple batteries are stacked such that the electrode layers of adjacent batteries are adjacent to each other or the counter electrode layers are adjacent to each other. The stacked battery comprises: The electrode terminal is connected to the side surface of the electrode current collector and the electrode-side insulating layer in the electrode layer; and The counter electrode terminal is connected to the side surface of the counter electrode current collector and the counter electrode side insulating layer in the counter electrode layer.

21. A method for manufacturing a battery, comprising: In the insulating layer lamination process, a first insulating layer is laminated on a portion of at least one face of the first current collector; The power generation element stacking process involves stacking an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer in that order to form a power generation element part, and a first current collector having the first insulating layer stacked on it, such that the electrode active material layer is covered by the first insulating layer. In the current collector stacking process, a second insulating layer and a second current collector are stacked on the side of the power generation element opposite to the first current collector side. The second insulating layer and the second current collector are stacked in the power generation element in such a manner that the second insulating layer is sandwiched between the counter electrode active material layer and the second current collector of the power generation element, and the first insulating layer and the second insulating layer are in an overlapping position when viewed in planar view. In the cutting process, the first current collector, which comprises the first insulating layer, the power generation element, the second insulating layer, and the second current collector, is cut off at the location where the first insulating layer and the second insulating layer are separated. When viewed in a plane, the length of the first insulating layer in the direction from the outer periphery of the battery toward the center is greater than the length of the second insulating layer in the same direction.

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