Battery, stacked battery and manufacturing method thereof

Abstract

This battery comprises an electrode layer, an antipole layer arranged facing the electrode layer, and a solid electrolyte layer positioned between the electrode layer and the antipole layer. The electrode layer has an electrode current collector, an electrode active material layer positioned between the electrode current collector and the solid electrolyte layer, and an electrode-side insulation layer positioned between the electrode current collector and the electrode active material layer at the end part of the electrode layer. The antipole layer has an antipole current collector, an antipole active material layer positioned between the antipole current collector and the solid electrolyte layer, and an antipole-side insulation layer positioned between the antipole current collector and the antipole active material layer at the end part of the antipole layer. In plan view, the length of the electrode-side insulation layer in the direction facing the center from the outer periphery of the battery is greater than the length of the antipole-side insulation layer in the direction facing the center from the outer periphery of the battery.

Description

[Technical Field]

[0001] The present disclosure relates to a battery, a stacked battery, and a method for manufacturing the same. [Background technology]

[0002] Patent Documents 1 and 2 disclose batteries equipped with insulating members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 164642 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-207286 Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art, there is a demand for improved reliability of batteries. Therefore, an object of the present disclosure is to provide a highly reliable battery and the like. [Means for solving the problem]

[0005] a counter electrode layer disposed opposite the electrode layer; and a solid electrolyte layer located between the electrode layer and the counter electrode layer, wherein 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 an 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 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, wherein, in a plan view, the length of the electrode-side insulating layer in a direction from the outer periphery toward the center of the battery is greater than the length of the counter electrode-side insulating layer in a direction from the outer periphery toward the center of the battery.

[0006] A stacked battery according to one aspect of the present disclosure includes a plurality of the above-described batteries, the plurality of batteries being stacked.

[0007] A method for manufacturing a battery according to one embodiment of the present disclosure includes an insulating layer laminating step of laminating a first insulating layer on a portion of at least one surface of a first current collector; a power generating element laminating step of laminating a power generating element portion having an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer laminated in this order, and the first current collector on which the first insulating layer has been formed, so that the electrode active material layer covers the first insulating layer; and a current collector laminating step of laminating a second insulating layer and a second current collector on the side of the power generating element portion opposite the first current collector. and a cutting step of cutting the first current collector, in which the first insulating layer, the power generating element portion, the second insulating layer, and the second current collector are stacked, together at a position to divide the first insulating layer and the second insulating layer. [Effects of the Invention]

[0008] According to the present disclosure, highly reliable batteries and the like can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic top view showing an example of a battery according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a schematic cross-sectional view showing an example of a battery according to a comparative example. [Figure 4] FIG. 4 is a schematic cross-sectional view showing another example of a battery according to a comparative example. [Figure 5] FIG. 5 is a flowchart illustrating a method for manufacturing a battery according to the first embodiment. [Figure 6A]FIG. 6A is a schematic diagram showing an example of a current collector on which insulating layers according to the first embodiment are stacked. [Figure 6B] FIG. 6B is a schematic diagram showing another example of the current collector on which the insulating layer according to the first embodiment is stacked. [Figure 6C] FIG. 6C is a schematic diagram showing another example of the current collector on which the insulating layer according to the first embodiment is stacked. [Figure 7A] FIG. 7A is a schematic cross-sectional view showing an example of a laminated electrode plate according to the first embodiment. [Figure 7B] FIG. 7B is a schematic cross-sectional view showing another example of the laminated electrode plate according to the first embodiment. [Figure 7C] FIG. 7C is a schematic cross-sectional view showing another example of the laminated electrode plate according to the first embodiment. [Figure 8] FIG. 8 is a diagram illustrating a current collector stacking step and a cutting step in the battery manufacturing method according to the first embodiment. [Figure 9] FIG. 9 is a schematic cross-sectional view showing an example of a battery according to Modification 1 of Embodiment 1. As shown in FIG. [Figure 10] FIG. 10 is a diagram illustrating a cutting step in a battery manufacturing method according to Modification 1 of Embodiment 1. In FIG. [Figure 11] FIG. 11 is a schematic top view showing an example of a battery according to Modification 2 of Embodiment 1. As shown in FIG. [Figure 12] FIG. 12 is a schematic side view showing an example of a battery according to Modification 2 of Embodiment 1. In FIG. [Figure 13] FIG. 13 is a schematic cross-sectional view showing an example of a battery according to Modification 3 of Embodiment 1. As shown in FIG. [Figure 14] FIG. 14 is a schematic cross-sectional view showing an example of a stacked battery according to the second embodiment. [Figure 15] FIG. 15 is a schematic cross-sectional view showing another example of the stacked battery according to the second embodiment. [Figure 16] FIG. 16 is a flowchart illustrating a method for manufacturing a stacked battery according to the second embodiment. [Figure 17] FIG. 17 is a schematic cross-sectional view showing an example of a laminated electrode plate according to the second embodiment. [Figure 18] FIG. 18 is a diagram illustrating the steps subsequent to the first stack stacking step in the manufacturing method for the laminated battery according to the second embodiment. [Figure 19] FIG. 19 is a schematic cross-sectional view showing an example of a laminated electrode plate according to Modification 1 of Embodiment 2. As shown in FIG. [Figure 20] FIG. 20 is a schematic cross-sectional view showing another example of a laminated electrode plate according to the first modification of the second embodiment. [Figure 21] FIG. 21 is a schematic cross-sectional view showing an example of a multilayer electrode plate according to Modification 1 of Embodiment 2. As shown in FIG. [Figure 22] FIG. 22 is a schematic cross-sectional view showing an example of a stacked battery according to a first modification of the second embodiment. [Figure 23] FIG. 23 is a schematic cross-sectional view showing an example of a stacked battery according to the third embodiment. [Figure 24] FIG. 24 is a schematic cross-sectional view showing another example of the stacked battery according to the third embodiment. [Figure 25] FIG. 25 is a schematic cross-sectional view showing yet another example of the stacked battery according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Findings that formed the basis of this disclosure) In batteries such as all-solid-state batteries that include a solid electrolyte layer containing a solid electrolyte, terminals may be formed at the ends of the battery to extract current. In particular, when batteries are used in a stacked configuration, forming terminals on the side surfaces of the battery eliminates the need to form terminals that do not contribute to the battery's capacity in the thickness direction, which has a significant impact on the battery's capacity, thereby increasing the battery's energy density. On the other hand, when forming terminals on the side surfaces of the battery to electrically connect to the current collector, it may be difficult to form the terminals due to the influence of the surface energy of the current collector, etc. Furthermore, because the current collector is thin, it is difficult to determine the position where the terminals are to be formed, which can lead to misalignment of the terminals. Thus, poor terminal formation can reduce the reliability of the battery.

[0011] Furthermore, in a battery, the edges of the current collector are prone to peeling, and when the current collector peels off, the active material layer is exposed and the active material is prone to falling off, reducing the reliability of the battery.

[0012] Therefore, the present disclosure provides a highly reliable battery, particularly a highly reliable battery that can increase energy density.

[0013] An outline of one aspect of the present disclosure is as follows.

[0014] a counter electrode layer disposed opposite the electrode layer; and a solid electrolyte layer located between the electrode layer and the counter electrode layer, wherein 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 an 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 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, wherein, in a plan view, the length of the electrode-side insulating layer in a direction from the outer periphery toward the center of the battery is greater than the length of the counter electrode-side insulating layer in a direction from the outer periphery toward the center of the battery.

[0015] This results in a region at the end of the electrode layer where the electrode current collector, electrode-side insulating layer, and electrode active material layer are stacked in this order, and a region at the end of the counter electrode layer where the counter current collector, counter-electrode-side insulating layer, and counter-electrode active material layer are stacked in this order. Therefore, even if the electrode current collector and counter current collector peel off at the ends of the electrode current collector and counter electrode current collector, where peeling is likely to occur, exposure of the electrode active material layer and counter electrode active material layer is suppressed, making it less likely that damage or short circuits will occur due to contact between the electrode active material layer and counter electrode active material layer and other components. Furthermore, even if the electrode current collector is more likely to peel off than the counter electrode current collector, the longer length of the electrode-side insulating layer makes it easier to protect the electrode active material layer. Furthermore, even when terminals for extracting current are formed on the side surfaces 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 it easier to identify the positions where the terminals are formed. Furthermore, even when the terminals are formed from a material such as conductive resin, the electrode-side insulating layer and counter electrode-side insulating layer improve the wettability of the material, making it easier to form the terminals. This prevents the occurrence of short circuits, poor connections, and the like due to poor terminal formation, thereby improving the reliability of the battery.

[0016] Furthermore, for example, the side surface of the electrode-side insulating layer and the side surface of the electrode current collector may be flush with each other, and the side surface of the counter-electrode-side insulating layer and the side surface of the counter electrode current collector may be flush with each other.

[0017] As a result, the side surfaces of the electrode-side insulating layer and the electrode current collector are flush with each other, and the side surfaces of the counter-electrode-side insulating layer and the counter-electrode current collector are flush with each other. Therefore, the areas of the electrode-side insulating layer and the counter-electrode-side insulating layer can be easily adjusted to manufacture a battery, for example, by cutting the electrode-side insulating layer and the electrode current collector together and cutting the counter-electrode-side insulating layer and the counter-electrode current collector together. Therefore, the presence of the electrode-side insulating layer and the counter-electrode-side insulating layer suppresses the exchange of electrons between the electrode active material layer and the electrode current collector and between the counter active material layer and the counter electrode current collector, resulting in the formation of regions where the electrode active material layer and the counter active material layer do not function as electrodes. However, these regions can be minimized by adjusting the areas of the electrode-side insulating layer and the counter-electrode-side insulating layer. This increases the volumetric energy density of the battery. Furthermore, the flush side surfaces allow for the easy formation of terminals for extracting current to the outside. Furthermore, compared to when the electrode current collector and the counter electrode current collector are stretched and used as terminals, the area that does not function as a battery is less likely to increase, and the volumetric energy density of the battery can be increased.

[0018] Furthermore, for example, the thickness of the electrode-side insulating layer may be half or more of the thickness of the electrode current collector, and the thickness of the counter electrode-side insulating layer may be half or more of the thickness of the counter electrode current collector.

[0019] This makes it easier to identify the positions where the terminals are formed, even when the terminals are formed as described above. Furthermore, because the electrode-side insulating layer and the counter-electrode-side insulating layer are thick, the electrode-side insulating layer and the counter-electrode-side insulating layer further improve the wettability of the material, even when the terminals are formed of a material such as a conductive resin.

[0020] Furthermore, for example, the electrode layer may be a positive electrode layer, and the counter electrode layer may be a negative electrode layer.

[0021] As a result, in plan view, the region where the electrode active material layer and the electrode-side insulating layer overlap and the region where it is difficult to function as a positive electrode is larger than the region where the counter electrode active material layer and the counter electrode-side insulating layer overlap and the region where it is difficult to function as a negative electrode. Therefore, the capacity of the negative electrode active material layer tends to be larger than the capacity of the positive electrode active material layer, which suppresses precipitation of metal derived from metal ions that were not incorporated into the negative electrode active material layer, and further improves the reliability of the battery.

[0022] Furthermore, for example, in a plan view, the length of the electrode-side insulating layer in a direction from the outer periphery toward the center of the battery may be the same as the length of the counter-electrode-side insulating layer in a direction from the outer periphery toward the center of the battery.

[0023] This makes the electrode-side insulating layer and the counter-electrode-side insulating layer the same in length, making it possible to easily manufacture the battery.

[0024] Furthermore, for example, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer may contain a resin.

[0025] This allows the resin contained in at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer to have an anchor effect by biting into the current collector and the active material layer, thereby improving 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, and suppressing peeling 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.

[0026] Furthermore, for example, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer may contain a metal oxide.

[0027] As a result, at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer becomes hard, so that even if at least one of the insulating layers is formed thin during battery production, at least one of the insulating layers is less likely to deform when stacked with other layers, and at least one of the insulating layers can be formed as a thin layer with a uniform thickness.

[0028] Furthermore, for example, the electrode-side insulating layer and the counter-electrode-side insulating layer may be made of the same material.

[0029] This eliminates the need to use different materials for the electrode-side insulating layer and the counter-electrode-side insulating layer, making it possible to easily manufacture the battery.

[0030] Furthermore, for example, the electrode-side insulating layer and the counter-electrode-side insulating layer may each have a length of 1 mm or less in a direction from the outer periphery toward the center of the battery in a plan view.

[0031] This allows the region in which the electrode active material layer and the counter electrode active material layer are less likely to function as electrodes due to the presence of the electrode-side insulating layer and the counter electrode-side insulating layer to be within a range of a certain length or less, thereby increasing the volumetric energy density of the battery.

[0032] Furthermore, 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.

[0033] This makes at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer thicker, which enhances the effect of making it easier to identify the position where the terminals are formed and the effect of making it easier to form the terminals, even when terminals for extracting current are formed on the side surfaces of the electrode current collector and the counter electrode current collector.

[0034] Furthermore, for example, the side surfaces of 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 be exposed.

[0035] This allows the layers that contribute to the charge / discharge performance of the battery to be present all the way to the ends of the battery, thereby increasing the volumetric energy density of the battery.

[0036] Furthermore, 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 flush with each other.

[0037] This eliminates steps and irregularities on the side surfaces of each layer of the battery. Therefore, there are no spaces that do not contribute to the charge / discharge performance of the battery, which would otherwise be formed by the irregularities, and this prevents a substantial decrease in the energy density of the battery. Therefore, the volumetric energy density of the battery can be increased.

[0038] Furthermore, for example, the electrode active material layer and the counter electrode active material layer may have the same shape and position in a plan view.

[0039] This makes it possible to reduce the difference in capacity between the counter electrode active material layer and the electrode active material layer, thereby maximizing the capacity of the counter electrode active material layer or the electrode active material layer.

[0040] Furthermore, for example, the side surface of the battery may be inclined with respect to the stacking direction in a direction such that the area of ​​the counter electrode layer is larger than the area of ​​the electrode layer in a plan view.

[0041] As a result, the side surface of the solid electrolyte layer is also inclined with respect to the stacking direction on the side surface of the battery, making the side surface of the solid electrolyte layer larger than when the side surface is not inclined. As a result, the distance between the electrode layer and the counter electrode layer separated by the solid electrolyte layer on the side surface of the battery is increased. Therefore, the electrode layer and the counter electrode layer are less likely to come into contact with each other, and short circuits are suppressed.

[0042] Furthermore, for example, the side surface of the battery may be a cut surface.

[0043] Since the side surfaces that become the ends of the battery are formed by cutting, the areas of the electrode-side insulating layer and the counter-electrode-side insulating layer can be adjusted depending on the cutting position, thereby reducing the area of ​​the region where the electrode active material layer and the counter-electrode active material layer do not function well as electrodes due to the presence of the electrode-side insulating layer and the counter-electrode-side insulating layer, thereby increasing the volumetric energy density of the battery. Furthermore, since the side surfaces of the battery are cut surfaces, the side surfaces of the electrode layer, the side surfaces of the counter electrode layer, and the side surfaces of the solid electrolyte layer can be easily made flush with each other.

[0044] Furthermore, for example, the shape of the cut surface may be rectangular or trapezoidal.

[0045] This results in a shape in which the edges of the cut surface are straight, and therefore there is no space that does not contribute to the charge / discharge performance of the formed battery due to the edges being non-straight, which prevents a substantial decrease in the energy density of the battery, thereby increasing the energy density of the battery.

[0046] Furthermore, for example, the electrode-side insulating layer may be provided on the outer periphery of the electrode layer in a planar view and have a frame shape, and the counter-electrode-side insulating layer may be provided on the outer periphery of the counter electrode layer in a planar view and have a frame shape.

[0047] This provides the effect that the electrode-side insulating layer and the counter-electrode-side insulating layer are provided at any position on the outer periphery of the electrode layer and the counter electrode layer, respectively.

[0048] Furthermore, for example, the shape of the battery in plan view may be rectangular, and the electrode-side insulating layer and the counter-electrode-side insulating layer may be disposed along two opposing sides of the rectangle in plan view.

[0049] As a result, the electrode-side insulating layer and the counter-electrode-side insulating layer are formed in strip shapes extending in one direction. Therefore, when forming the electrode-side insulating layer and the counter-electrode-side insulating layer by coating or the like, it is only necessary to move the coating nozzle or the electrode current collector and the counter electrode current collector, etc., in only one direction, allowing for efficient battery production.

[0050] Furthermore, for example, the solid electrolyte layer may include a solid electrolyte having lithium ion conductivity.

[0051] This makes it possible to improve the reliability of a lithium ion battery containing a solid electrolyte.

[0052] A stacked battery according to one aspect of the present disclosure includes a plurality of the above-described batteries, and the plurality of batteries are stacked.

[0053] As a result, since the above-mentioned batteries are stacked, a highly reliable stacked battery can be realized.

[0054] Furthermore, for example, the plurality of batteries may be stacked such that the electrode layers or the counter electrode layers of adjacent batteries among the plurality of batteries are adjacent to each other, and the stacked battery may include an electrode terminal in contact with a side surface of the electrode current collector and the electrode-side insulating layer in the electrode layer, and a counter electrode terminal in contact with a side surface of the counter electrode current collector and the counter-electrode-side insulating layer in the counter electrode layer.

[0055] In this way, in a stacked battery that is stacked so as to be connectable in parallel, an electrode terminal for extracting current from the electrode layer and a counter terminal for extracting current from the counter electrode layer are provided in contact with the side surfaces of the electrode current collector and the counter current collector, respectively. This eliminates the need to form so-called margins on the electrode current collector and the counter current collector for connection to connection terminals such as leads, thereby making it possible to further increase the volumetric energy density of the stacked battery.

[0056] Furthermore, because the electrode current collector and counter electrode current collector are made of metal foil or the like, they have high surface energy and are easily repelling the materials of the electrode terminal and counter electrode terminal. Because the electrode-side insulating layer and counter electrode-side insulating layer contain, for example, resin, the wettability of the materials of the electrode terminal and counter electrode terminal is better than that of the electrode current collector and counter electrode current collector. Furthermore, compared to electrode active material layers and counter electrode active material layers formed from active material mixtures, the materials of the electrode terminal and counter electrode terminal are less likely to penetrate into the electrode-side insulating layer and counter electrode-side insulating layer. Therefore, it is easy to form the electrode terminal and counter electrode terminal in the region including the side surfaces 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 stacked battery, the positions of the side surfaces of the electrode current collector and counter electrode current collector become difficult to identify. However, the presence of the electrode-side insulating layer and counter electrode-side insulating layer laminated on the electrode current collector and counter electrode current collector, respectively, makes the positions of the side surfaces of the electrode current collector and counter electrode current collector easier to identify. This prevents the electrode terminal and the counter terminal from being misaligned, which can cause a short circuit, etc. In this way, when forming the electrode terminals and the counter terminals in the stacked battery, it is possible to prevent the electrode terminals and the counter terminals from being poorly formed, and a highly reliable stacked battery can be formed.

[0057] Furthermore, a method for manufacturing a battery according to an embodiment of the present disclosure includes an insulating layer laminating step of laminating a first insulating layer on a portion of at least one surface of a first current collector; a power generating element laminating step of laminating a power generating element portion having an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer laminated in this order, and the first current collector on which the first insulating layer has been formed, such that the electrode active material layer covers the first insulating layer; and a current collector laminating step of laminating a second insulating layer and a second current collector on the side of the power generating element portion opposite to the first current collector side. the method includes a current collector stacking step of stacking the second insulating layer and the second current collector on the power generating element part so that the second insulating layer is sandwiched between the counter electrode active material layer of the power generating element part and the second current collector and so that the first insulating layer and the second insulating layer overlap in a plan view; and a cutting step of cutting the first current collector, in which the first insulating layer, the power generating element part, the second insulating layer, and the second current collector are stacked, all at once at a position to divide the first insulating layer and the second insulating layer.

[0058] As a result, the first current collector, the first insulating layer, and the electrode active material layer are stacked in this order at the end of the first current collector of the manufactured battery. Furthermore, the second current collector, the second insulating layer, and the counter electrode active material layer are stacked in this order at the end of the second current collector. Therefore, even if the first current collector and the second current collector peel off at the ends of the first and second current collectors, where peeling is likely to occur, the first insulating layer and the second insulating layer are exposed, thereby preventing exposure of the electrode active material layer and the counter electrode active material layer. As a result, damage or short circuits caused by contact between the electrode active material layer and the counter electrode active material layer and other components are less likely to occur. This makes it possible to manufacture a highly reliable battery.

[0059] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0060] The embodiments described below are all comprehensive or specific examples, and the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present disclosure.

[0061] Furthermore, in this specification, terms indicating the relationship between elements, such as parallel and flush, terms indicating the shape of elements, such as flat and rectangular, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0062] In addition, the drawings are not necessarily strict illustrations, and the same reference numerals are used to designate substantially the same components in the drawings, and redundant explanations are omitted or simplified.

[0063] In this specification and drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In each embodiment, the z-axis direction is the stacking direction of the battery. The positive direction of the z-axis is the upper side in the z-axis direction, and the negative direction of the z-axis is the lower side in the z-axis direction. In this specification, "planar view" means the case where the battery is viewed along the z-axis. In addition, "thickness" in this specification refers to the length of each layer in the stacking direction. In other words, the direction in which each layer is stacked is the thickness direction of each layer.

[0064] Furthermore, in this specification, the terms "above" and "below" in the battery configuration do not refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in the stacking configuration. Furthermore, the terms "above" and "below" are applied not only to a case where two components are arranged with a gap between them and another component exists between them, but also to a case where two components are arranged closely together and the two components are in contact with each other.

[0065] (Embodiment 1) The following describes the battery according to embodiment 1. The battery according to embodiment 1 is a single cell including one electrode active material layer and one counter electrode active material layer.

[0066] [composition] First, the configuration of a battery according to embodiment 1 will be described with reference to the drawings. Fig. 1 is a schematic top view showing an example of a battery according to this embodiment. In Fig. 1, the planar shapes of the components of the battery are shown by solid and broken lines. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1.

[0067] 1 and 2, a battery 50 according to the present embodiment includes an electrode layer 10, a counter electrode layer 20 disposed opposite the electrode layer 10, and a solid electrolyte layer 30 located between the electrode layer 10 and the counter electrode layer 20. In other words, 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 in this order.

[0068] 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 between the current collector 11 and the electrode active material layer 12 at an end of the electrode layer 10 in a planar view. The current collector 11 and the electrode active material layer 12 have the same shape and position in a 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.

[0069] 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 between the current collector 21 and the counter electrode active material layer 22 at an end of the counter electrode layer 20 in a planar view. The current collector 21 and the counter electrode active material layer 22 have the same shape and are located in the same position in a planar view. The current collector 21 is an example of a counter electrode current collector, and the insulating layer 23 is an example of a counter electrode-side insulating layer.

[0070] The battery 50 is, for example, an all-solid-state battery. The side surfaces of the battery 50 are parallel to the stacking direction. The side surfaces of the battery 50 are flat planes. In other words, the side surfaces of the electrode layer 10, the counter electrode layer 20, and the solid electrolyte layer 30 are not level and are located on the same flat plane. That is, the side surfaces of the electrode layer 10, the counter electrode layer 20, and the solid electrolyte layer 30 are flush with each other. Note that the side surfaces are surfaces that extend from the end of the main surface in a direction intersecting with the main surface when a plane perpendicular to the stacking direction is taken as the main surface of each component of the battery 50. The shape of the battery 50 in a planar view is rectangular. Therefore, the shapes of the electrode layer 10, the counter electrode layer 20, and the solid electrolyte layer 30 in a planar view are rectangular.

[0071] Furthermore, at the end of the electrode layer 10 in a direction perpendicular to the stacking direction, the side of the insulating layer 13, the side of the electrode active material layer 12, and the side of the current collector 11 are flush with each other. Furthermore, at the end of the counter electrode layer 20 in a direction perpendicular to the stacking direction, the side of the insulating layer 23, the side of the counter electrode active material layer 22, and the side of the current collector 21 are flush with each other. In other words, at the end of the battery 50 in a direction perpendicular to the stacking direction, the side of 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 flush with each other and form the same flat plane. As a result, there are no steps or unevenness on the side of each layer of the battery 50, and therefore no space that does not function as a battery due to unevenness is formed, and the volumetric energy density of the battery 50 is substantially improved. Furthermore, since the side surfaces of the layers can be made flush by cutting the layers together, the areas of the insulating layers 13 and 23 can be easily adjusted when manufacturing the battery 50.

[0072] 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 blade such as a cutter, and is, for example, a surface having cut marks such as fine grooves. By forming the cut surface on the battery 50 in this manner, the positions where the insulating layers 13 and 23 are formed can be adjusted, thereby reducing the area of ​​the portions of the battery 50 that do not contribute to the charge / discharge performance (the portions where the insulating layers 13 and 23 are formed, described in detail later), and improving the volumetric energy density. Furthermore, by forming the cut surface, the side surface of the electrode layer 10, the side surface of the counter electrode layer 20, and the side surface of the solid electrolyte layer 30 can be easily made flush with each other. The cut marks may be smoothed by polishing or the like. The shape of the cut surface is not limited, but in the case of the battery 50, it is rectangular.

[0073] In addition, in the battery 50, the side surfaces 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 positioned such that they do not cover each other's outer peripheral side surfaces. This allows each layer that contributes to the charge / discharge performance of the battery 50 to be present all the way to the edges of the battery 50, thereby improving the volumetric energy density of the battery 50. The exposed side surfaces may be covered with a terminal, a sealing member, or the like. In other words, the term "exposed" as used above means that each layer stacked in the battery 50 does not cover the side surfaces of the other layers on the edge side.

[0074] In the battery 50, the current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, and the current collector 21 have the same shape and are positioned in a planar view. The current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, and the current collector 21 are rectangular in planar view, but are not particularly limited thereto and may be circular, elliptical, polygonal, or the like.

[0075] The current collector 11 is in contact with the lower surfaces of the electrode active material layer 12 and the insulating layer 13, and covers the lower surfaces of the electrode active material layer 12 and the insulating layer 13. The insulating layer 13 is laminated on the end portion of the current collector 11 in a plan view. The thickness of the current collector 11 is, for example, 5 μm or more and 100 μm or less.

[0076] Known materials can be used as the material for the current collector 11. For example, the current collector 11 is a foil, plate, or mesh-like material made of copper, aluminum, nickel, iron, stainless steel, platinum, gold, or an alloy of two or more of these metals.

[0077] The electrode active material layer 12 is laminated above the current collector 11 so as to cover 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 with the solid electrolyte layer 30 sandwiched between them. The electrode active material layer 12 has a region that does not overlap with the insulating layer 13 in a planar view. Furthermore, the electrode active material layer 12 and the counter electrode active material layer 22 have the same shape and position in a planar view. The thickness of the electrode active material layer 12 is, for example, 5 μm or more and 300 μm or less. The materials used for the electrode active material layer 12 will be described later.

[0078] 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 in a plan view of the insulating layer 13 contact the electrode active material layer 12. The insulating layer 13 contacts the electrode active material layer 12 at the end of the electrode layer 10 in a plan view. The side surface of the insulating layer 13 is flush with the side surface of the current collector 11. The side surface of the insulating layer 13 is flush with the side surface of the electrode active material layer 12. The lower surface of the insulating layer 13 contacts the current collector 11. The insulating layer 13 overlaps with the counter electrode active material layer 22 in a plan view.

[0079] In the illustrated example, the insulating layer 13 is located on the outer periphery of the electrode layer 10 in a plan view and has a frame shape. 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.

[0080] The insulating layer 13 contains, for example, at least one of a resin and a metal oxide. Examples of the resin include silicone resin, epoxy resin, acrylic resin, and polyimide resin. The resin may be a thermosetting resin or an ultraviolet-curing resin. When the insulating layer 13 contains a resin, the resin penetrates into the current collector 11 and the electrode active material layer 12, thereby enhancing the bonding between the insulating layer 13 and the current collector 11 and the electrode active material layer 12, for example, by providing an anchor effect. Examples of the metal oxide include silicon oxide, titanium oxide, and aluminum oxide. When the insulating layer 13 contains a metal oxide, the insulating layer 13 becomes hard. Therefore, even if the insulating layer 13 is formed thin during the manufacturing of the battery 50, the insulating layer 13 is less likely to deform when stacked with other layers, and a thin insulating layer 13 with a uniform thickness can be formed.

[0081] The thickness of the insulating layer 13 is, for example, thinner than the thickness of the electrode active material layer 12. The thickness of the insulating layer 13 is at least half the thickness of the current collector 11. This makes it easier to identify the positions of terminals formed on the side surfaces of the current collector 11. Even when the terminals are formed from a conductive resin or the like, the insulating layer 13 improves the wettability of the conductive resin, facilitating the formation of the terminals. To enhance these effects, the thickness of the insulating layer 13 may be 80% or more of the thickness of the current collector 11, or may be greater than or equal to the thickness of the current collector 11. The thickness of the insulating layer 13 may be, for example, 5 μm or more, or 10 μm or more. The insulating layer 13 is, for example, completely insulating; however, depending on the desired battery characteristics, the insulating layer 13 may have slight conductivity depending on the constituent material and thickness of the insulating layer 13.

[0082] Furthermore, from the viewpoint of the effective area contributing to power generation, i.e., from the viewpoint of volumetric energy density, the insulating layer 13 is located in a region having a length from the outer periphery of the electrode active material layer 12 of 1 mm or less in a planar view. That is, the length of the insulating layer 13 in the direction from the outer periphery toward the center of the battery 50 is, for example, 1 mm or less. Furthermore, when the insulating layer 13 is formed in a frame or line shape, the width of the insulating layer 13 is, for example, 1 mm or less, or may be 0.5 mm or less, or may be 0.1 mm or less, from the viewpoint of volumetric energy density. The width of the insulating layer 13 is changed, for example, depending on the desired battery characteristics.

[0083] In addition, in a plan view, the length of insulating layer 13 in the direction from the periphery toward the center of battery 50 is greater than the length of insulating layer 23 in the direction from the periphery toward the center of battery 50. In a plan view, insulating layer 13 is also present in a region of battery 50 that is more inward than the region where insulating layer 23 is formed.

[0084] The current collector 21 is in contact with the upper surface of the counter electrode active material layer 22 and the upper surface of the insulating layer 23, and covers the upper surface of the counter electrode active material layer 22 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 21 can be the same as that of the current collector 11 described above.

[0085] The counter electrode active material layer 22 is laminated on the solid electrolyte layer 30 and disposed opposite the electrode active material layer 12. The upper surface of the counter electrode active material layer 22 contacts the current collector 21. The counter electrode active material layer 22 also contacts 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 a region that does not overlap with the insulating layer 23 in a plan view. 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.

[0086] 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 in a plan view of the insulating layer 23 contact the counter electrode active material layer 22. The insulating layer 23 contacts the counter electrode active material layer 22 at the end of the counter electrode layer 20 in a plan view. The side surface of the insulating layer 23 and the side surface of the current collector 21 are flush with each other. The side surface of the insulating layer 23 and the side surface of the counter electrode active material layer 22 are flush with each other. The lower surface of the insulating layer 23 contacts the current collector 21. Furthermore, the insulating layer 23 overlaps with the insulating layer 13 in a plan view.

[0087] In the illustrated example, the insulating layer 23 is located on the outer periphery of the counter electrode layer 20 in a plan view and has a frame shape. 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.

[0088] The insulating layer 23 may be made of the materials listed in the description of the insulating layer 13 above. The insulating layer 13 and the insulating layer 23 may be made of, for example, the same material. This eliminates the need to use different materials for the insulating layer 13 and the insulating layer 23, making it possible to easily manufacture the battery 50. Note that the insulating layer 13 and the insulating layer 23 may be made of different materials.

[0089] The thickness of the insulating layer 23 is, for example, thinner than the thickness of the counter electrode active material layer 22. The thickness of the insulating layer 23 is at least half the thickness of the current collector 21. This makes it easier to identify the position of a terminal even when the terminal is formed on the side surface of the current collector 21. Even when the terminal is formed of a conductive resin or the like, the insulating layer 23 improves the wettability of the conductive resin, making it easier to form the terminal. From the viewpoint of enhancing these effects, the thickness of the insulating layer 23 may be 80% or more of the thickness of the current collector 21, or may be greater than or equal to the thickness of the current collector 21. The thickness of the insulating layer 23 may be, for example, 5 μm or more, or 10 μm or more. The insulating layer 23 is, for example, completely insulating; however, depending on the desired battery characteristics, the insulating layer 23 may have slight conductivity depending on the constituent material and thickness of the insulating layer 23.

[0090] Furthermore, from the viewpoint of the effective area contributing to power generation, i.e., from the viewpoint of volumetric energy density, the insulating layer 23 is located in a region having a length of 1 mm or less from the outer periphery of the counter electrode active material layer 22 in a planar view. That is, the length of the insulating layer 23 in the direction from the outer periphery toward the center of the battery 50 is, for example, 1 mm or less. Furthermore, 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 may be 0.5 mm or less, or may be 0.1 mm or less, from the viewpoint of volumetric energy density. The width of the insulating layer 23 is changed, for example, depending on the desired battery characteristics.

[0091] 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, not less than 5 μm and not more than 150 μm.

[0092] The solid electrolyte layer 30 includes at least a solid electrolyte and may include a binder material as needed. The solid electrolyte layer 30 may include a solid electrolyte having lithium ion conductivity.

[0093] As the solid electrolyte, known materials such as lithium ion conductors, sodium ion conductors, or magnesium ion conductors can be used. Examples of solid electrolytes that can be used include solid electrolyte materials such as sulfide solid electrolytes, halogen-based solid electrolytes, and oxide solid electrolytes. As the sulfide solid electrolyte, materials capable of conducting lithium ions, such as a composite of lithium sulfide (LiS) and diphosphorus pentasulfide (P2S5), can be used. Furthermore, sulfides such as LiS-SiS2, LiS-B2S3, or LiS-GeS2 can be used. Sulfides obtained by adding at least one of LiN, LiCl, LiBr, LiPO4, and Li4SiO4 to the above sulfides as an additive can also be used.

[0094] As an oxide solid electrolyte, materials that can conduct lithium ions include, for example, Li7La3Zr2O 12 (LLZ), Li 1.3 Al 0.3 Ti1.7 (PO4)3(LATP) or (La,Li)TiO3(LLTO) are used.

[0095] As the binder material, for example, elastomers are used, and organic compounds such as polyvinylidene fluoride, acrylic resin, or cellulose resin may also be used.

[0096] In the present embodiment, one of the electrode layer 10 including the electrode active material layer 12 and the counter electrode layer 20 including the counter electrode active material layer 22 is a positive electrode layer including a positive electrode active material layer, and the other is a negative electrode layer including a negative electrode active material layer.

[0097] The positive electrode active material layer contains at least a positive electrode active material, and may contain at least one of a solid electrolyte, a conductive additive, and a binder material, as necessary.

[0098] The positive electrode active material may be a known material capable of absorbing and releasing (inserting and desorbing, or dissolving and depositing) lithium ions, sodium ions, or magnesium ions. Examples of the positive electrode active material capable of extracting and inserting lithium ions include lithium cobalt oxide composite oxide (LCO), lithium nickel oxide composite oxide (LNO), lithium manganese oxide composite oxide (LMO), lithium-manganese-nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), and lithium-nickel-manganese-cobalt composite oxide (LNMCO).

[0099] The solid electrolyte may be any of the above-described solid electrolyte materials. The conductive additive may be, for example, a conductive material such as acetylene black, carbon black, graphite, or carbon fiber. The binder may be any of the above-described binder materials.

[0100] The negative electrode active material layer contains at least a negative electrode active material, and may contain, as necessary, at least one of a solid electrolyte, a conductive additive, and a binder material, similar to those of the positive electrode active material layer.

[0101] The negative electrode active material may be a known material capable of occluding and releasing (inserting and desorbing, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions. Examples of materials capable of occluding and inserting lithium ions include carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, and resin-baked carbon, metallic lithium, lithium alloys, and oxides of lithium and transition metal elements.

[0102] Thus, the battery 50 includes an electrode layer 10, a counter electrode layer 20 disposed opposite 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 includes 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 between the current collector 11 and the electrode active material layer 12 at an end of the electrode layer 10 in a planar view. The counter electrode layer 20 includes 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 between the current collector 21 and the counter electrode active material layer 22 at an end of the counter electrode layer 20 in a planar view.

[0103] As a result, the insulating layer 13 between the current collector 11 and the electrode active material layer 12 and the insulating layer 23 between the current collector 21 and the counter electrode active material layer 22 are present at the ends of the current collector 11 and the current collector 21, where peeling is likely to occur. Therefore, even if the current collector 11 and the current collector 21 peel off, the electrode active material layer 12 and the counter electrode active material layer 22 are prevented from being exposed. This reduces the likelihood of damage or short circuits due to contact between the electrode active material layer 12 and the counter electrode active material layer 22 and other components. This improves the reliability of the battery 50. Furthermore, even when terminals for extracting current are formed on the side surfaces of the current collector 11 and the current collector 21, the insulating layers 13 and 23 serve as markers, making it easy to identify the positions of the terminals. Furthermore, even when the terminals are formed from a material such as conductive resin, the insulating layers 13 and 23 improve the wettability of the material, facilitating the formation of the terminals. This reduces the risk of short circuits and poor connections due to poor terminal formation, thereby improving the reliability of the battery 50.

[0104] Furthermore, at the end of the electrode layer 10, the side surface of the current collector 11 is flush with the side surface of the insulating layer 13, and at the end of the counter electrode layer 20, the side surface of the current collector 21 is flush with the side surface of the insulating layer 23. Therefore, the area where the terminal is to be formed has a flat surface, making it easy to form the terminal.

[0105] Furthermore, because the side surfaces 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 flush with each other, the areas of the insulating layer 13 and insulating layer 23 can be easily adjusted to manufacture the battery 50 by, for example, cutting each layer together. Therefore, the presence of the insulating layer 13 and insulating layer 23 suppresses the exchange of electrons between the electrode active material layer 12 and the current collector 11 and between the counter electrode active material layer 22 and the current collector 21, forming regions where the electrode active material layer 12 and the counter electrode active material layer 22 do not easily function as electrodes. However, by adjusting the areas of the insulating layer 13 and insulating layer 23, these regions can be minimized. This allows the volumetric energy density of the battery 50 to be increased.

[0106] Furthermore, the length of the insulating layer 13 in the direction from the periphery toward the center of the battery 50 is longer than the length of the insulating layer 23 in the direction from the periphery toward the center of the battery 50. As a result, even if the current collector 11 is more likely to peel off than the current collector 21, the long length of the insulating layer 13 makes it easier to protect the electrode active material layer 12. Furthermore, when the electrode layer 10 is a positive electrode layer and the counter electrode layer 20 is a negative electrode layer, the effect of suppressing dendrite formation in the counter electrode layer 20 is achieved. This point will be described in detail with reference to batteries 950 and 950a according to comparative examples, in which the area of ​​the negative electrode active material layer is larger than the area of ​​the positive electrode active material layer in a plan view. When manufacturing a battery, it is common to make the area of ​​the negative electrode active material layer larger than the area of ​​the positive electrode active material layer. This is intended to increase the capacity of the negative electrode active material layer greater than the capacity of the positive electrode active material layer to suppress the precipitation of metal derived from metal ions not incorporated into the negative electrode active material layer, so-called dendrites, and thereby improve the reliability of the battery. Furthermore, by arranging the end of the negative electrode active material layer more outward than the end of the positive electrode active material layer, it is possible to suppress electric field concentration at the end of the negative electrode active material layer, thereby suppressing dendrite growth (metal deposition). Figures 3 and 4 are schematic cross-sectional views showing examples of batteries according to comparative examples.

[0107] 3 , 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 includes a current collector 911 and a positive electrode active material layer 912 located between the current collector 911 and the solid electrolyte layer 930. The negative electrode layer 920 includes a current collector 921 and a negative electrode active material layer 922 located between the current collector 921 and the solid electrolyte layer 930. The solid electrolyte layer 930 covers the side surfaces of the positive electrode active material layer 912 and the negative electrode active material layer 922, and is in contact with the current collector 911 and the current collector 921. In the battery 950, the area of ​​the negative electrode active material layer 922 is larger than the area of ​​the positive electrode active material layer 912 in a plan view, and the end of the negative electrode active material layer 922 is located outside the end of the positive electrode active material layer 912. In this way, in the battery 950, the area of ​​the negative electrode active material layer 922 is made larger than the area of ​​the positive electrode active material layer 912, thereby suppressing metal deposition. Furthermore, because the solid electrolyte layer 930 is present at the end of the battery 950, even if the current collector 911 and the current collector 921 peel off from the end, the positive electrode active material layer 912 and the negative electrode active material layer 922 are suppressed from being exposed.

[0108] Region 2C, where the positive electrode active material layer 912 and the negative electrode active material layer 922 are present, functions as a battery. On the other hand, region 2A, where neither the positive electrode active material layer 912 nor the negative electrode active material layer 922 are present, does not function as a battery. Region 2B, where the negative electrode active material layer 922 is present but the positive electrode active material layer 912 is not present, also does not function as a battery. Region 2B is a region corresponding to the difference in area between the positive electrode active material layer 912 and the negative electrode active material layer 922. As region 2B and region 2A become wider in plan view, the proportion of the region that does not contribute to power generation in the battery 950 increases, and the volumetric energy density of the battery 950 decreases. On the other hand, as region 2B becomes narrower in plan view, higher alignment accuracy is required in manufacturing processes such as the process of stacking each layer. This higher required accuracy raises concerns about an increase in the number of processes, such as inspections, and an increase in equipment costs.

[0109] Furthermore, regions 2A, 2B, and 2C differ in the type and number of layers present in the thickness direction, other than current collectors 911 and 921. That is, region 2A contains only one layer, solid electrolyte layer 930; region 2B contains two layers, negative electrode active material layer 922 and solid electrolyte layer 930; and region 2C contains three layers, positive electrode active material layer 912, negative electrode active material layer 922, and solid electrolyte layer 930. In all-solid-state batteries constructed with powder materials, high-pressure pressing may be included in the manufacturing process to form favorable interfaces between the powder materials (e.g., interfaces with favorable bonding between the powder materials and low grain boundary resistance), thereby improving battery reliability and increasing the volumetric energy density through high packing. In this case, regions 2A, 2B, and 2C differ in the type and number of constituent layers, and each layer also differs in its compressibility. Therefore, when the entire battery 950 is pressed, the degree of compression may differ in each region, i.e., there is a concern that compression may not be uniform. For example, in regions 2A and 2B, the compression is insufficient compared to region 2C, which may result in peeling of layers and other deterioration in reliability.

[0110] That is, battery 950 has problems in that it is difficult to manufacture battery 950 and reliability is not sufficiently improved. Furthermore, region 2A, which is the only layer in the thickness direction that is solid electrolyte layer 930, is a portion that does not particularly contribute to the basic charge / discharge performance of the battery, and therefore, from the viewpoint of improving the volumetric energy density, it is preferable that region 2A is small.

[0111] 4 includes a positive electrode layer 910 having a current collector 911 and a positive electrode active material layer 912, a negative electrode layer 920a having a current collector 921a and a negative electrode active material layer 922a, and a solid electrolyte layer 930a. The battery 950a differs from the battery 950 in that the solid electrolyte layer 930a does not cover the side surface of the negative electrode active material layer 922a. While the battery 950a does not have a region without the positive electrode active material layer 912 or the negative electrode active material layer 922, as in the region 2A, the battery 950a does have a region 3A without the positive electrode active material layer 912. Therefore, the region 3A does not contribute to power generation, and the same problem as the region 2B also occurs in the region 3A of the battery 950a.

[0112] 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 the electrode active material layer 12 is a positive electrode layer having a positive electrode active material layer, and the counter electrode layer 20 having the counter electrode active material layer 22 is a negative electrode layer having a negative electrode active material layer. In this case, electrons do not directly reach the positive electrode active material layer (electrode active material layer 12) in contact with the insulating layer 13 from the current collector 11, so the positive electrode active material layer in region 1A shown in FIG. 2 does not function as an electrode. On the other hand, the positive electrode active material layer in region 1B functions as an electrode. Also, electrons do not directly reach the negative electrode active material layer (counter electrode active material layer 22) in contact with the insulating layer 23 from the current collector 21, so the negative electrode active material layer in region 1AA shown in FIG. 2 does not 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 positive electrode active material layer and the negative electrode active material layer have the same area in plan view, but region 1A is wider than region 1AA and region 1B is narrower than region 1BB, so the area of ​​the region of the positive electrode active material layer that easily functions as an electrode is relatively narrow, thereby achieving the effect of substantially reducing the area of ​​the positive electrode active material layer in plan view. In other words, in battery 50, even if the areas of the positive electrode active material layer and the negative electrode active material layer in plan view are the same, metal deposition is suppressed.

[0113] Furthermore, because the positive electrode active material layer and the negative electrode active material layer have the same shape and position in a plan view, 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 of the negative electrode active material layer that functions as an electrode is also located outside the region of the positive electrode active material layer that functions as an electrode. As a result, electric field concentration at the end of the region of the negative electrode active material layer that functions as an electrode is suppressed, and dendrite growth at the end is suppressed. This improves the reliability of the battery 50.

[0114] Furthermore, in manufacturing the battery 50, the areas of the positive electrode active material layer and the negative electrode active material layer can be adjusted by the insulating layer 13 and the insulating layer 23, so there is no need to precisely form the positions and areas of the positive electrode active material layer and the negative electrode active material layer. This makes it possible to easily manufacture the battery 50. For example, the battery 50 can be easily manufactured by cutting a laminate in which a positive electrode layer (electrode layer 10), a solid electrolyte layer 30, and a negative electrode layer (counter electrode layer 20) are stacked at the region including the insulating layer 13 and the insulating layer 23.

[0115] 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. Furthermore, 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 when a high-pressure press treatment is performed, all regions are more likely to be compressed uniformly than, for example, when a solid electrolyte layer is present on the side surfaces of the electrode active material layer 12 and the counter electrode active material layer 22, as in the battery according to the comparative example described above. Therefore, peeling of the layers of the battery 50 is less likely to occur, and the high-pressure press treatment can improve the reliability and volumetric energy density of the battery 50.

[0116] [Manufacturing method] Next, a method for manufacturing the battery according to this embodiment will be described. Note that the method for manufacturing the battery 50 described below is an example, and the method for manufacturing the battery 50 is not limited to the following example.

[0117] The manufacturing method of the battery 50 includes an insulating layer laminating step, a power generating element laminating step, a current collector laminating step, and a cutting step. Each step will be described in detail below.

[0118] (1) Insulation layer lamination process First, the insulating layer laminating step will be described. Fig. 5 is a flowchart for explaining the method for manufacturing a battery according to this embodiment.

[0119] In the insulating layer lamination step, an insulating layer 13 is laminated on at least one surface of a current collector 11. Specifically, first, a current collector 11 is prepared (step S11 in FIG. 5). Then, an insulating layer 13 is formed as an electrode-side insulating layer on at least one surface of the prepared current collector 11 (step S12 in FIG. 5). For example, the insulating layer 13 is formed on the current collector 11 by laminating the 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.

[0120] 6A, 6B, and 6C are schematic diagrams illustrating an example of a current collector 11 on which an insulating layer 13 is laminated. FIG. 6A (a) is a top view illustrating an example of the current collector 11 on which an insulating layer 13 is laminated, and FIG. 6A (b) is a cross-sectional view taken along line VIa-VIa in FIG. 6A (a). The insulating layer 13 may be formed in a lattice pattern, as shown in FIG. 6A. FIG. 6B is a top view illustrating another example of the current collector 11 on which an insulating layer 13 is laminated. Although a cross-sectional view is not shown in FIG. 6B, the current collector 11 on which the insulating layer 13 is laminated shown in FIG. 6B has the same cross-sectional structure as FIG. 6A (b). The insulating layer 13 may be formed in a stripe pattern, as shown in FIG. 6B. By laminating the insulating layer 13 in such a relatively simple planar shape having elongated portions, such as a lattice or stripe, the insulating layer 13 can be easily formed on the current collector 11. Furthermore, in a cutting step described later, the insulating layer 13 is divided along the longitudinal direction of the insulating layer 13, which makes it possible to easily form batteries 50 in which the insulating layer 13 is formed along the end portions of the battery 50. In Figures 6A and 6B, rectangular regions 1E and 1F depicted by dotted lines correspond to the size of one battery 50. In this way, the insulating layer 13 may be laminated on the current collector 11 so that it can be divided into multiple batteries in a later manufacturing step.

[0121] 6C(a) is a top view showing yet another example of the current collector 11 on which the insulating layer 13 is laminated, and Fig. 6C(b) is a cross-sectional view taken along line VIc-VIc in Fig. 6C(a). As shown in Fig. 6C, the lattice-shaped insulating layer 13 having a plurality of different patterns (for example, lattice spacing) may be formed on the current collector 11.

[0122] In this way, the insulating layer 13 is laminated in a grid or stripe pattern, and in the cutting process described below, the insulating layer 13 is divided along the longitudinal direction of the grid or stripe of the insulating layer 13, thereby making it possible to simultaneously manufacture multiple batteries 50 each having the same shape or different shapes, thereby improving the manufacturing efficiency of the batteries 50.

[0123] Various processes can be considered for forming the insulating layer 13, but from the viewpoint of mass production, for example, a coating process is used. For example, in a continuous process such as a roll-to-roll system, a coating material in which an insulating material (e.g., a metal oxide) is dispersed in a solvent is applied to the current collector 11 using a high-precision coating method such as a gravure roll method or an inkjet method, and 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 with a uniform thickness. Therefore, when a high-pressure press is performed to laminate other layers in the power generating element lamination process described below, the insulating layer 13 is less likely to be affected, and the other layers are more likely to be compressed uniformly. Furthermore, using such a high-precision coating method increases the precision of the area of ​​the electrode active material layer 12, which is essentially effective as an electrode.

[0124] When a resin is used as the material of insulating layer 13, a solution in which the resin is dissolved or dispersed may be applied onto current collector 11, or an ultraviolet-curable resin or a thermosetting resin may be applied onto current collector 11 and then cured. The formation of insulating layer 13 is not limited to a continuous process such as a roll-to-roll method, and may be a batch process in which insulating layer 13 is formed for each current collector 11.

[0125] The solvent used to form the insulating layer 13 may be a general organic solvent or aqueous solvent that disperses or dissolves metal oxides or resins.

[0126] (2) Power generating element stacking process Next, the power generating element lamination step will be described. In the power generating element lamination step, a power generating element part 40 in which an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22 are laminated in this order is laminated on a current collector 11 on which an insulating layer 13 has been laminated in the insulating layer lamination step, so that the electrode active material layer 12 covers the insulating layer 13. In this way, in the power generating element lamination step, a covering structure in which the electrode active material layer 12 covers the insulating layer 13 is formed.

[0127] In the power generating element lamination step, the power generating element section 40 is formed, for example, by sequentially laminating an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22 on a current collector 11. Specifically, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are laminated in this order on the current collector 11 on which the insulating layer 13 has been laminated (steps S13, S14, and S15 in FIG. 5). For example, the electrode active material layer 12 is laminated on the current collector 11 on which the insulating layer 13 has been laminated so as to cover the insulating layer 13, and then the solid electrolyte layer 30 and the counter electrode active material layer 22 are laminated in this order. Furthermore, if necessary, a high-pressure press treatment is performed on the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 laminated in steps S13, S14, and S15 (step S16 in FIG. 5). Furthermore, if necessary, a heat treatment is performed on the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 laminated in steps S13, S14, and S15. This results in a laminated electrode plate in which the power generating element section 40 is laminated on the current collector 11 on which the insulating layer 13 is laminated. Note that in the power generating element lamination step, the power generating element section 40 formed by laminating the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 may be laminated on the current collector 11 in advance.

[0128] 7A, 7B, and 7C are schematic cross-sectional views showing examples of a laminated electrode plate according to the present embodiment. As shown in Fig. 7A, in a laminated electrode plate 41, a power generating element 40, in which an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22 are laminated in this order, is laminated on a current collector 11 on which an insulating layer 13 is laminated. The laminated electrode plate 41 is formed so that the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 have the same area and position in a plan view. The upper surface of the counter electrode active material layer 22 is exposed.

[0129] The structure of the laminated electrode plate 41 is not limited to this example. For example, as shown in Fig. 7B, the laminated electrode plate 41a is formed so that the side and upper surfaces of the electrode active material layer 12 are covered with the solid electrolyte layer 30, and the side and upper surfaces of the solid electrolyte layer 30 are covered with the counter electrode active material layer 22. In this way, the electrode active material layer 12 is covered with the solid electrolyte layer 30, which suppresses the occurrence of a short circuit due to contact between the electrode active material layer 12 and the counter electrode active material layer 22 in the power generating element lamination step.

[0130] 7C , for example, the laminated electrode plate 41b is formed so that the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 have decreasing areas in this order in a planar view. In a planar view, 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 of the design in which the counter electrode active material layer 22 is located inside the solid electrolyte layer 30, even if the stacking position in a planar view is shifted when stacking the counter electrode active material layer 22, the solid electrolyte layer 30 prevents the occurrence of a short circuit due to contact between the electrode active material layer 12 and the counter electrode active material layer 22.

[0131] The laminated electrode plate in this embodiment may have any of the structures of laminated electrode plates 41, 41a, and 41b, and may have a structure other than laminated electrode plates 41, 41a, and 41b as long as it has a structure in which a power generating element part 40 is laminated on a current collector 11 on which an insulating layer 13 is laminated.

[0132] The electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 that constitute the power generating element section 40 are each formed in this order by, for example, a wet coating method. By using the wet coating method, the power generating element section 40 can be easily laminated on the current collector 11. Examples of wet coating methods that can be used include die coating, doctor blade, roll coater, screen printing, and inkjet printing, but are not limited to these methods.

[0133] When the wet coating method is used, a coating process is carried out in which materials for forming the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 (the materials for the positive electrode active material layer, the solid electrolyte layer 30, and the negative electrode active material layer described above) are appropriately mixed with a solvent to obtain a slurry.

[0134] The solvent used in the paint-making step may be a known solvent used in producing a known all-solid-state battery (for example, a lithium-ion all-solid-state battery).

[0135] The slurries for each layer obtained in the coating process are applied to the current collector 11 on which the insulating layer 13 has been formed, in the order of the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22. In this case, the next layer may be applied after the previous layer has been applied, or the next layer may be applied while the previous layer is being applied. In other words, steps S13, S14, and S15 may be performed simultaneously. After the slurries for each layer are applied sequentially and all layers are coated, a heat treatment to remove the solvent and binder material and a high-pressure press treatment to promote the filling of the materials for each layer may be performed. The heat treatment and high-pressure press treatment may also be performed after each layer is applied. In other words, step S16 may also be performed between steps S13, S14, and S15. The heat treatment and high-pressure pressing may be performed for each coating layer of the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22, or may be performed separately after coating any two layers and after coating one layer, or may be performed all at once after coating all three layers. For the high-pressure pressing, a roll press, a flat plate press, or the like may be used. At least one of the heat treatment and the high-pressure pressing may not be performed.

[0136] By performing the layered coating method in this manner, it is possible to improve the bonding strength and reduce the interfacial resistance at the interfaces of the current collector 11, insulating layer 13, electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22. It is also possible to improve the bonding strength and reduce the grain boundary resistance in the powder materials used in the electrode active material layer 12, solid electrolyte layer 30, and counter electrode active material layer 22. In other words, good interfaces are formed between the layers of the power generating element section 40 and between the powder materials within each layer.

[0137] The insulating layer laminating step and the power generating element laminating step may be carried out in a continuous process such as a roll-to-roll method.

[0138] (3) Current collector stacking process and cutting process Next, the current collector laminating step and cutting step will be described. FIG. 8 is a diagram illustrating the current collector laminating step and cutting step in the manufacturing method of a battery according to this embodiment. In the current collector laminating step, an additional current collector on which a counter electrode-side insulating layer has been formed is laminated on a laminated electrode plate (step S17 in FIG. 5). For example, as shown in FIG. 8, a current collector 21 on which an insulating layer 23 has been formed is laminated on the surface of a laminated electrode plate 41 opposite to the current collector 11 side of the power generating element section 40 (the surface perpendicular to the lamination direction of the power generating element section 40 on which the current collector 11 is not laminated). In other words, the insulating layer 23 and the current collector 21 are laminated on the power generating element section 40 laminated on the current collector 11. At this time, for example, the current collector 21 on which the insulating layer 23 has been formed is joined to the upper surface of the exposed counter electrode active material layer 22 of the laminated electrode plate 41 by a press process or the like. The press process is performed, for example, at a pressure lower than that of the high-pressure press process in step S16. Furthermore, the current collector 21 on which the insulating layer 23 is formed is laminated on the laminated electrode plate 41 so that the insulating layer 23 is sandwiched between the counter electrode active material layer 22 of the laminated electrode plate 41 and the current collector 21. In the description of this manufacturing method, the insulating layer 23 is an example of a second insulating layer, and the current collector 21 is an example of a second current collector.

[0139] The current collector 21 with the insulating layer 23 formed thereon is formed, for example, by laminating the insulating layer 23 on the upper surface of the current collector 21 in the same manner as the current collector 11 with the insulating layer 13 formed thereon. The shape of the insulating layer 23 here is, for example, the same pattern as the insulating layer 13 shown in FIGS. 6A, 6B, and 6C, but narrower than the insulating layer 13. That is, the insulating layer 23 is laminated so that the area of ​​the insulating layer 23 is smaller than the area of ​​the insulating layer 13 in a planar view. In this way, 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. Then, the current collector 21 with the insulating layer 23 formed thereon is laminated on the laminated electrode plate 41 so that the insulating layer 13 and the insulating layer 23 overlap in a planar view. For example, the current collector 21 with the insulating layer 23 formed thereon is laminated on the laminated electrode plate 41 so that the entire insulating layer 23 in the region where the battery 50 will ultimately be formed overlaps the insulating layer 13.

[0140] Next, in the cutting step, the laminated electrode plate 41, 41a, or 41b, on which the current collectors 21 on which the insulating layer 23 has been formed in the current-collector laminating step are stacked, is cut all at once in the stacking direction at positions where the insulating layer 13 and the insulating layer 23 are divided (step S18 in FIG. 5). The laminated electrode plate 41, 41a, or 41b, on which the current collectors 21 on which the insulating layer 23 has been formed are stacked, is, in other words, the current collector 11 on which the insulating layer 13, the power-generating element section 40, the insulating layer 23, and the current collector 21 are stacked. As shown in FIG. 8, the laminated electrode plate 41 on which the current collectors 21 on which the insulating layer 23 has been formed are cut, for example, with a blade or laser light at positions indicated by dashed lines C1, C2, C3, and C4 where the insulating layer 13 and the insulating layer 23 are located. At the positions of dashed lines C1, C2, C3, and C4, 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 in this order, and these are cut all at once. This eliminates the need to stack each layer of the power generating element 40 in the shape after cutting, making it easier to manufacture the battery 50. For example, if the insulating layer 13 is stacked in a lattice or stripe pattern with long portions as shown in FIGS. 6A, 6B, and 6C in a plan view, the laminated electrode plate on which the current collector 21 on which the insulating layer 23 is formed is cut all at once along the long direction of the lattice or stripe of the insulating layer 13. This results in a battery 50 in which the insulating layer 13 and the insulating layer 23 are located throughout the entire end area on the cut surface side of the manufactured battery 50.

[0141] In the current collector lamination step, an insulating layer 23 may be laminated on the upper surface of the counter electrode active material layer 22 in the laminated electrode plate 41 at a position overlapping with the insulating layer 13 in a plan view, and the current collector 21 may be further laminated thereon. In this case, the cutting step is carried out after the current collector 21 is laminated on the laminated electrode plate 41 on which the insulating layer 23 has been laminated.

[0142] As described above, the manufacturing method of the battery 50 includes a cutting step of cutting 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 at positions where they are stacked. As a result, the side surfaces 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 at the ends in a direction perpendicular to the stacking direction. After cutting, a sealing member or the like may be disposed to cover the exposed side surfaces to protect them. That is, when the side surfaces are covered with another member such as a sealing member, the exposed side surfaces may also be covered with the other member.

[0143] In this way, by including a cutting step of cutting the positions where 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, the end portions of each of 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 in a direction perpendicular to the stacking direction are exposed.

[0144] (4) Effects, etc. As described above, the manufacturing method of the battery 50 according to this embodiment includes an insulating layer laminating step, a power generating element laminating step, a current collector laminating step, and a cutting step. In the insulating layer laminating step, the insulating layer 13 is laminated on at least a portion of one surface of the current collector 11. In the power generating element laminating step, the power generating element section 40, in which the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are laminated in this order, and the current collector 11 on which the insulating layer 13 has been formed are laminated so that the electrode active material layer 12 covers the insulating layer 13. In the current collector laminating step, the current collector 21 on which the insulating layer 23 has been formed is laminated on the laminated electrode plate 41 formed by laminating the power generating element section 40 on the current collector 11. In the cutting step, the laminated electrode plate 41, in which the current collector 21 on which the insulating layer 23 has been formed is laminated, is cut in the lamination direction at a position to divide the insulating layer 13 and the insulating layer 23.

[0145] As a result, the laminated electrode plate 41, in which the current collectors 21 on which the insulating layers 23 are formed are stacked, is cut all at once in the stacking direction at the positions that divide the insulating layers 13 and 23. Therefore, it is not necessary to stack the layers of the power generating element section 40 in the shapes after cutting, and the battery 50 can be easily manufactured.

[0146] Furthermore, the laminated electrode plate 41, in which the current collector 21 on which the insulating layer 23 is formed is stacked, is cut in the stacking direction at a position where the insulating layer 13 and the insulating layer 23 are divided, so that the battery 50 is manufactured in which the insulating layer 13 is stacked on the end of the current collector 11 in a plan view, and the insulating layer 23 is stacked on the end of the current collector 21. Furthermore, the electrode active material layer 12 is stacked so as to cover the insulating layer 13 stacked on the current collector 11, and the counter electrode active material layer 22 is stacked so as to cover the insulating layer 23 stacked on the current collector 21. Therefore, 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 the ends of the current collectors 11 and 21, where peeling is likely to occur, the insulating layers 13 and 23 are exposed, thereby suppressing 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 members are less likely to occur. Therefore, a highly reliable battery 50 can be manufactured.

[0147] Furthermore, the dimensions of the insulating layer 13 and the insulating layer 23 can be determined simply by adjusting the cutting position. Therefore, although the presence of the insulating layer 13 and the insulating layer 23 forms regions where the electrode active material layer 12 and the counter electrode active material layer 22 do not easily function as electrodes, these regions can be minimized by adjusting the dimensions of the insulating layer 13 and the insulating layer 23. Therefore, a battery 50 with a high volumetric energy density can be easily manufactured.

[0148] Furthermore, when the electrode active material layer 12 is a positive electrode active material layer and the counter electrode active material layer 22 is a negative electrode active material layer, the width of the insulating layer 13 is larger than the width of the insulating layer 23. As described above, the positive electrode active material layer has a smaller effective area (area functioning as an electrode) than the negative electrode active material layer, and the region functioning as an electrode is located inside the negative electrode active material layer in a plan view. As a result, metal deposition in the negative electrode active material layer is suppressed as described above. This further improves the reliability of the battery 50 produced.

[0149] Furthermore, by cutting in the stacking direction, laminated electrode plate 41, in which current collectors 21 on which insulating layer 23 has been formed are stacked, is cut all at once, and battery 50 is obtained in which insulating layer 13 and insulating layer 23 are stacked on the ends of current collector 11 and current collector 21, respectively. Therefore, there is no need to individually stack positive electrode active material layers and negative electrode active material layers having shapes with a substantial area difference for each unit cell, and battery 50 can be manufactured easily and with high production efficiency.

[0150] Without the insulating layers 13 and 23, even if the laminate including the current collector 11, the power generating element 40, and the current collector 21 is cut in one go, the electrode active material layer 12 is laminated on the end of the current collector 11, and the counter electrode active material layer 22 is laminated on the end of the current collector 21. This means that when the ends of the current collector 11 and the current collector 21 peel off, the electrode active material layer 12 and the counter electrode active material layer 22 cannot be prevented from being exposed. Furthermore, a battery is produced in which there is no substantial difference in area between the electrode active material layer 12 and the counter electrode active material layer 22. Therefore, even if the battery can be easily produced, this method is difficult to adopt as a manufacturing method because it reduces the reliability of the battery. On the other hand, in the manufacturing method according to the present embodiment, as described above, the laminated electrode plate 41 including the current collector 21 on which the insulating layer 23 is formed is cut in one go at the position where the insulating layers 13 and 23 are divided. Therefore, by cutting the laminated electrode plate 41 in which the current collector 21 on which the insulating layer 23 is formed is laminated at once, a battery can be easily manufactured, and it is also possible to suppress exposure of the electrode active material layer 12 and the counter 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 areas of the insulating layer 13 and the insulating layer 23. In this way, by combining the current collector lamination step of laminating the current collector 21 on which the insulating layer 23 is formed on the laminated electrode plate 41 with the cutting step of cutting the laminated electrode plate 41 in which the current collector 21 on which the insulating layer 23 is formed is laminated at positions to divide the insulating layer 13 and the insulating layer 23, a battery that is highly reliable and has a high volumetric energy density can be easily manufactured.

[0151] (5) Other manufacturing methods The method for manufacturing the battery according to this embodiment is not limited to the above example, and may be, for example, the manufacturing method shown below.

[0152] First, a current collector 11 is prepared in the shape shown in Figures 1 and 2. Then, an insulating layer 13 is laminated on the current collector 11 in the shape shown in Figures 1 and 2 using a coating process or the like. An electrode active material layer 12 and a solid electrolyte layer 30 are laminated in this order on the entire surface of the current collector 11 on which the insulating layer 13 has been laminated, by lamination coating, to obtain an electrode plate.

[0153] Next, a current collector 21 is prepared in the shape shown in Figures 1 and 2. Then, an insulating layer 23 is laminated on the current collector 21 in the shape shown in Figures 1 and 2 using a coating process or the like. A counter electrode active material layer 22 and a solid electrolyte layer 30 are laminated in this order on the entire surface of the current collector 21 on which the insulating layer 23 has been laminated, by lamination coating, to obtain a counter electrode plate.

[0154] Next, the obtained electrode plate and counter electrode plate are stacked so that their solid electrolyte layers 30 are in contact with each other. The stacked body is pressed from both sides in the stacking direction using a flat press, thereby obtaining a battery 50.

[0155] In addition, the battery 50 may be formed by forming a laminate by stacking the insulating layer 13, the insulating layer 23, and the power generating element part 40 on a base separate from the current collector, and, if necessary, cutting the laminate in the stacking direction at a position where the insulating layer 13 and the insulating layer 23 are to be divided, and then sandwiching the obtained laminate between the current collector 11 and the current collector 21.

[0156] [Variation 1] The following describes Modification 1 of Embodiment 1. In the following description of Modification 1 of Embodiment 1, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0157] 9 is a schematic cross-sectional view showing an example of a battery according to this modification. As shown in Fig. 9, battery 51 differs from battery 50 of embodiment 1 in that the side surface of battery 51 is inclined with respect to the stacking direction.

[0158] The battery 51 includes an electrode layer 10a, a counter electrode layer 20a disposed opposite the electrode layer 10a, and a solid electrolyte layer 30a located between the electrode layer 10a and the counter electrode layer 20a.

[0159] The electrode layer 10a includes 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 between the current collector 11a and the electrode active material layer 12a at an end of the electrode layer 10a. The counter electrode layer 20a includes 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 between the current collector 21a and the counter electrode active material layer 22a at an end of the counter electrode layer 20a.

[0160] A side surface 51s connecting two main surfaces perpendicular to the stacking direction of the battery 51 is inclined with respect to the stacking direction in a direction such that the area of ​​the counter electrode layer 20a is larger than the area of ​​the electrode layer 10a in a plan view. In other words, the side surface 51s is inclined with respect to the stacking direction in a direction such that the width of the counter electrode layer 20a is larger than the width of the electrode layer 10a in a cross section obtained by cutting the battery 51 in the stacking direction. That is, in the battery 51, the area of ​​the main surface 22s of the counter electrode active material layer 22a facing the electrode active material layer 12a is larger than the area of ​​the main surface 12s of the electrode active material layer 12a facing the counter electrode active material layer 22a. Furthermore, 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 including the electrode active material layer 12a is a positive electrode layer including a positive electrode active material layer, and the counter electrode layer 20a including the counter electrode active material layer 22a is a negative electrode layer including a negative electrode active material layer. In this case, the area of ​​the negative electrode active material layer is larger than the area of ​​the positive electrode active material layer in a plan view, and therefore, in the battery 51, metal deposition is suppressed.

[0161] Furthermore, at the side surface 51s, the side surface of the solid electrolyte layer 30a is also inclined with respect to the stacking direction, so that the exposed surface of the solid electrolyte layer 30a becomes larger and the distance between the electrode active material layer 12a and the counter electrode active material layer 22a at the side surface 51s becomes longer. As a result, the electrode active material layer 12a and the counter electrode active material layer 22a are less likely to come into contact with each other, thereby suppressing short circuits.

[0162] All of the side surfaces 51s of the battery 51, including side surfaces 51s not shown, are inclined with respect to the stacking direction, and the area of ​​the main surface 22s is larger than the area of ​​the main surface 12s. Note that it is not necessary for all of the side surfaces 51s of the battery 51 to be inclined with respect to the stacking direction, as long as at least one side surface 51s is inclined with respect to the stacking direction.

[0163] The battery 51 is manufactured, for example, by cutting the battery 50 according to the first embodiment in a direction inclined relative to the stacking direction. The battery 51 may also be manufactured by cutting the battery 50 in a cutting step in a manufacturing method of the battery 50 in a direction inclined relative to the stacking direction. In other words, the side surface 51s may be a cut surface. The shape of the cut surface of the battery 51 is trapezoidal.

[0164] FIG. 10 is a diagram illustrating the cutting step in the battery manufacturing method according to this modified example. As shown in FIG. 10, a battery 51 is manufactured by cutting the battery in a direction tilted at an angle θ from the stacking direction in the cutting step described above. The angle θ may be determined based on the width of the insulating layer formed, the desired battery characteristics, and other factors. The angle θ is, for example, less than 45 degrees. The angle θ may be 30 degrees or less. Furthermore, when the angle θ is zero degrees, a battery 50 is manufactured. For example, if the thickness of the battery 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 cut surface is greater than 45 degrees, the insulating layer 13 will be removed by cutting, and the effect of the insulating layer 13 will not be obtained.

[0165] [Variation 2] The following describes Modification 2 of Embodiment 1. In the following description of Modification 2 of Embodiment 1, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0166] Fig. 11 is a schematic top view showing an example of a battery according to this modification. In Fig. 11, the planar shapes of each component of the battery are indicated by solid and dashed lines. Fig. 12 is a schematic side view showing an example of a battery according to this modification. Fig. 12 is a plan view of a side surface along the longitudinal direction of battery 52 as viewed from the front. As shown in Figs. 11 and 12, battery 52 differs from battery 50 of embodiment 1 in that the insulating layer is formed in a striped pattern.

[0167] The battery 52 has a configuration in which, instead of the insulating layers 13 and 23 in the battery 50, it includes insulating layers 13b and 23b whose planar shapes are different from those of the insulating layers 13 and 23. The battery 52 includes an electrode layer 10b, a counter electrode layer 20b disposed opposite the electrode layer 10b, and a solid electrolyte layer 30 positioned between the electrode layer 10b and the counter electrode layer 20b. The electrode layer 10b includes a current collector 11, an electrode active material layer 12 positioned between the current collector 11 and the solid electrolyte layer 30, and an insulating layer 13b positioned between the current collector 11 and the electrode active material layer 12 at an end of the electrode layer 10b. The counter electrode layer 20b includes a current collector 21, a counter electrode active material layer 22 positioned between the current collector 21 and the solid electrolyte layer 30, and an insulating layer 23b positioned between the current collector 21 and the counter electrode active material layer 22 at an end of the counter electrode layer 20b.

[0168] 11 and 12, insulating layer 13b and insulating layer 23b are each disposed along two opposing sides of a rectangle that is the shape of battery 52 in a plan view. That is, insulating layer 13b and insulating layer 23b are each in the form of two stripes extending in one direction (the y direction, which is the longitudinal direction of battery 52 in a plan view in the example of FIG. 11). Insulating layer 13b and insulating layer 23b are each not formed along two other opposing sides that are perpendicular to the two opposing sides of the rectangle.

[0169] In this way, insulating layer 13b and insulating layer 23b are formed in a strip shape extending in one direction, so when insulating layer 13b and insulating layer 23b are formed by coating or the like, it is only necessary to move the coating nozzle or current collector 11, current collector 21, etc. in only one direction, and battery 52 can be manufactured efficiently.

[0170] In addition, insulating layer 13b and insulating layer 23b may each be arranged along two opposing sides extending in the short direction of the rectangle of battery 52 when viewed in a plane, rather than along two opposing sides extending in the long direction of the rectangle.

[0171] [Variation 3] The following describes Modification 3 of Embodiment 1. In the following description of Modification 3 of Embodiment 1, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0172] Fig. 13 is a schematic cross-sectional view showing an example of a battery according to this modification. As shown in Fig. 13, 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.

[0173] Battery 53 has a configuration in which, instead of insulating layer 23 in battery 50, it has an insulating layer 23c having a width different from that of insulating layer 23. Battery 53 has electrode layer 10, counter electrode layer 20c disposed opposite electrode layer 10, and solid electrolyte layer 30 positioned between electrode layer 10 and counter electrode layer 20c. Counter electrode layer 20c has current collector 21, counter electrode active material layer 22 positioned between current collector 21 and solid electrolyte layer 30, and insulating layer 23c positioned between current collector 21 and counter electrode active material layer 22 at an end of counter electrode layer 20c.

[0174] In battery 53, in a plan view, the length of insulating layer 13 in the direction from the periphery toward the center of battery 53 is the same as the length of insulating layer 23c in the direction from the periphery toward the center of battery 53. In a plan view, the region where insulating layer 13 is formed is the same as the region where insulating layer 23c is formed. In this way, 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, and therefore battery 53 can be easily manufactured.

[0175] (Embodiment 2) Next, a description will be given of embodiment 2. In embodiment 2, a stacked battery will be described in which unit cells such as the battery according to embodiment 1 are stacked. In the following description, differences from embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified as appropriate.

[0176] [composition] First, the configuration of a stacked battery according to embodiment 2 will be described with reference to the drawings. Fig. 14 is a schematic cross-sectional view showing an example of a stacked battery according to this embodiment. As shown in Fig. 14, the stacked battery 100 has a structure in which unit cells having a structure similar to that of the battery 50 according to embodiment 1 are stacked. In other words, the stacked battery 100 is a stacked-type battery in which a plurality of unit cells are stacked.

[0177] The stacked battery 100 includes a plurality of batteries 50a. The top battery 50a has the same configuration as the battery 50. In addition, the second and subsequent batteries 50a from the top share the current collector of the counter electrode layer 20 with the current collector 11 of the battery 50a immediately above the battery 50a. For example, the current collector 11 of the top battery 50a is a current collector in the electrode layer 10 of the top battery 50a, but is also a current collector in the counter electrode layer of the second battery 50a from the top. In this embodiment, the current collector 11 is also an example of a counter electrode current collector. In the second and subsequent batteries 50a from the top, 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 flush with the side surface of the current collector 11.

[0178] In the stacked battery 100, the multiple batteries 50a are stacked such that the electrode layer 10 of one battery and the counter electrode layer 20 of the other battery face each other, in other words, are adjacent to each other. This results in a structure in which the function of the current collector 11 is shared by the adjacent batteries 50a. Furthermore, by stacking the batteries in this manner, the stacked battery 100 becomes a series-stacked type stacked battery. This makes it possible to realize a series-stacked type high-voltage stacked battery 100 that exhibits the same effects as the battery 50 according to the first embodiment.

[0179] In the example shown in FIG. 14, the number of stacked batteries 50a is five, but it may be two or more and four or less, or six or more.

[0180] The side surface of the stacked battery 100 is, for example, a cut surface. The side surface of the stacked battery 100 is a flat plane. In other words, the side surfaces of the multiple batteries 50a are flush with each other. Each layer may be exposed on the side surface of the stacked battery 100, and a sealing member or the like may be provided on the exposed side surface. FIG. 15 is a schematic cross-sectional view showing another example of a stacked battery according to this embodiment. As shown in FIG. 15, the stacked battery 100a has a structure in which the side surface of the stacked battery 100, for example, all of the side surfaces, are covered with a sealing member 60. In other words, the stacked battery 100a includes the stacked battery 100 and the sealing member 60, and the side surfaces of each layer constituting the stacked battery 100 are covered with the sealing member 60. This prevents the side surfaces of each layer in the stacked battery 100a from being directly exposed to the outside, thereby increasing the strength of the stacked battery 100a and improving the reliability of the stacked battery 100a. Furthermore, because the stacked battery 100a is protected by the sealing member 60, the stacked battery 100a can be used not only by being enclosed in a metal case or an aluminum laminate film, but also as an electronic component mounted on a circuit board, for example.

[0181] The sealing member 60 is in contact with, for example, the side surface of the battery stack 100. The sealing member 60 of the battery stack 100a is formed, for example, by placing the battery stack 100 with its side surface facing upward and applying the sealing member to the side surface from above using a dispenser or the like. Known materials for sealing members used in batteries (e.g., lithium-ion solid-state batteries), such as thermosetting resins, can be used as the material for the sealing member 60. Such sealing member materials can impart functions such as water resistance and impact resistance. The sealing member 60 may also be composed of multiple layers of sealing member. In this case, the materials of the multiple layers may be the same or different.

[0182] [Manufacturing method] Next, a method for manufacturing the stacked battery according to this embodiment will be described. Note that the method for manufacturing the stacked battery 100 described below is an example, and the method for manufacturing the stacked battery 100 is not limited to the following example.

[0183] The manufacturing method for the stacked battery 100 includes an insulating layer laminating step, a power generating element laminating step, a current collector laminating step, and a cutting step, similar to the manufacturing method for the battery 50. Because the stacked battery 100 is a battery including a plurality of power generating element units 40, the manufacturing method for the stacked battery 100 can also be said to be a manufacturing method for a battery including a plurality of power generating element units 40. Each step will be described in detail below.

[0184] (1) Insulation layer lamination process First, the insulating layer laminating step will be described. Fig. 16 is a flowchart for explaining the method for manufacturing a laminated battery according to this embodiment.

[0185] In the insulating layer lamination step, first, a plurality of current collectors 11 are prepared (step S21 in FIG. 16). Then, an insulating layer 13 is formed on one surface of each of the prepared plurality of current collectors 11, and an insulating layer 23 is formed on the other surface (step S22 in FIG. 16). In forming the insulating layers 13 and 23, the insulating layers 13 and 23 are laminated on the current collector 11 using a method similar to that of S12 described above. In forming the insulating layers 13 and 23, for example, the insulating layers 13 and 23 are formed in the same pattern at positions where they overlap in a planar view. Furthermore, the width of the insulating layer 13 is formed to be larger than the width of the insulating layer 23 in a planar view. In other words, the insulating layers 13 and 23 are formed so that the area of ​​the insulating layer 13 is larger than the area of ​​the insulating layer 23 in a planar view. Furthermore, for example, the insulating layer 13 and the insulating layer 23 are formed so that the entire insulating layer 23 in the region where the stacked battery 100 will ultimately be formed overlaps the insulating layer 13 in a plan view.

[0186] (2) Power generating element stacking process Next, the power generating element lamination step will be described. In the manufacturing method according to this embodiment, the power generating element lamination step includes a first laminate formation step and a first laminate lamination step. In the first laminate formation step, a plurality of laminated electrode plates are formed by laminating a power generating element portion 40 on each of a plurality of current collectors 11, on which insulating layers 13 and 23 are laminated, such that the electrode active material layer 12 covers the insulating layer 13. FIG. 17 is a schematic cross-sectional view showing an example of a laminated electrode plate according to this embodiment. As shown in FIG. 17, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 are laminated in this order on each of the plurality of current collectors 11, on which the insulating layers 13 and 23 are laminated (steps S23, S24, and S25 in FIG. 16). At this time, the electrode active material layer 12 is laminated on the surface of the current collector 11 on which the insulating layer 13 is formed. In this way, a laminated electrode plate 42 is formed. Furthermore, if necessary, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 laminated in steps S23, S24, and S25 are each subjected to high-pressure pressing (step S26 in FIG. 16). Furthermore, if necessary, the electrode active material layer 12, the solid electrolyte layer 30, and the counter electrode active material layer 22 laminated in steps S23, S24, and S25 are each subjected to heat treatment. In steps S23, S24, S25, and S26, the same methods as those in steps S13, S14, S15, and S16 described above can be used.

[0187] Next, in the first stack lamination step, a multilayer electrode plate is formed by stacking the plurality of stack electrode plates 42 so that the insulating layers 13 of the plurality of stack electrode plates 42 formed in the first stack formation step overlap in plan view (step S27 in FIG. 16 ). FIG. 18 is a diagram for explaining the steps subsequent to the first stack lamination step in the manufacturing method for a stacked battery according to this embodiment. As shown in FIG. 18 , in the first stack lamination step, a multilayer electrode plate 45 is formed in which the plurality of stack electrode plates 42 are stacked. As shown in FIG. 18 , in the first stack lamination step, the plurality of stack electrode plates 42 are stacked so that the counter electrode active material layer 22 of one of the adjacent stack electrode plates 42 faces the other current collector 11. In other words, the plurality of stack electrode plates 42 are stacked so that the insulating layer 23 stacked on the other current collector 11 is sandwiched between the counter electrode active material layer 22 of one of the adjacent stack electrode plates 42 and the other current collector 11. Then, for example, a pressing process is performed in which the stacked plurality of laminated electrode plates 42 are pressed from both sides in the stacking direction to join the plurality of laminated electrode plates 42 together to form a multilayer electrode plate 45. In the multilayer electrode plate 45, of adjacent laminated electrode plates 42, the current collector 11 of the upper laminated electrode plate 42 is in contact with the counter electrode active material layer 22 of the lower laminated electrode plate 42. Furthermore, of adjacent laminated electrode plates 42, the insulating layer 23 of the upper laminated electrode plate 42 is located between the current collector 11 of the upper laminated electrode plate 42 and the counter electrode active material layer 22 of the lower laminated electrode plate 42.

[0188] If 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 when forming the laminated electrode plate 42, high-pressure pressing is not required in the pressing process when forming the multilayer electrode plate 45. For example, the pressure used in the pressing process for joining the laminated electrode plates 42 together in step S27 is lower than the pressure used in the high-pressure pressing process in step S26. This allows the multilayer electrode plate 45 to be formed without destroying the interfaces formed in the first laminate forming step.

[0189] (3) Current collector stacking process and cutting process Next, the current collector laminating step and cutting step will be described. In the current collector laminating step, an additional current collector on which a counter electrode-side insulating layer has been formed is laminated on a multilayer electrode plate (step S28 in FIG. 16). For example, as shown in FIG. 18, in a multilayer electrode plate 45, a current collector 21 on which an insulating layer 23 has been formed is laminated on the surface of the power generating element section 40 of the uppermost laminate electrode plate 42 (the laminate electrode plate 42 on whose upper surface no other laminate electrode plate 42 has been laminated) opposite to the current collector 11 side. At this time, for example, the current collector 21 on which the insulating layer 23 has been formed is joined to the upper surface of the exposed counter electrode active material layer 22 of the uppermost laminate electrode plate 42 by a press process or the like. The press process is performed, for example, at a pressure lower than that of the high-pressure press process in step S26. Furthermore, the current collector 21 on which the insulating layer 23 has been formed is laminated on the laminated electrode plate 41 so that the insulating layer 23 is sandwiched between the counter electrode active material layer 22 of the uppermost laminated electrode plate 42 and the current collector 21 .

[0190] The current collector 21 on which the insulating layer 23 is formed 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 so that it has the same shape and position in a plan view as the insulating layer 23 formed on the current collector 11. Then, the current collector 21 on which the insulating layer 23 is formed is stacked on the multilayer electrode plate 45 so that the insulating layer 23 and the insulating layer 11 overlap each other in a plan view. For example, the current collector 21 on which the insulating layer 23 is formed is stacked on the multilayer electrode plate 45 so that the entire insulating layer 23 in the region where the stacked battery 100 will ultimately be formed overlaps the insulating layer 13 in a plan view.

[0191] Next, in the cutting step, the multilayer electrode plate 45, in which the current collectors 21 on which the insulating layers 23 have been formed in the current collector stacking step are stacked, is cut all at once in the stacking direction at positions where the insulating layers 13 and 23 are to be divided (step S29 in FIG. 16 ). As shown in FIG. 18 , for example, the multilayer electrode plate 45, in which the current collectors 21 on which the insulating layers 23 have been formed are stacked, is cut with a blade or laser light at the positions of dashed lines C5, C6, C7, and C8 where the insulating layers 13 and 23 are located. This results in the stacked battery 100 shown in FIG. 14 . The insulating layer 23 is formed on the lower surface of the lowermost current collector 11 of the multilayer electrode plate 45 shown in FIG. 18 . However, the stacked battery 100 may be obtained by removing the insulating layer 23, or the stacked battery 100 may be used with the insulating layer 23 remaining.

[0192] At the positions of dashed lines C5, C6, C7, and C8, a plurality of laminated electrode plates 42 are stacked, and these are cut all at once. By cutting a plurality of laminated electrode plates 42 all at once in this way, it is not necessary to manufacture unit cells in the shape after cutting and then stack them, and this significantly reduces the number of times that the power generating element parts 40 are stacked in the power generating element stacking step. Therefore, the stacked type stacked battery 100 can be manufactured efficiently.

[0193] Before the current collector lamination step, an insulating layer 23 may be formed on the upper surface of the counter electrode active material layer 22 of the uppermost laminated electrode plate 42 of the multilayer electrode plate 45 at a position overlapping with the insulating layer 13 in a plan view. In this case, the current collector 21 is laminated on the multilayer electrode plate 45 on which the insulating layer 23 has been formed, and then the cutting step is carried out.

[0194] In this way, by using the manufacturing method of the laminated battery according to this embodiment, a high-voltage laminated battery 100 of the series stack type can be manufactured.

[0195] [Variation 1] The following describes Modification 1 of Embodiment 2. In the following description of Modification 1 of Embodiment 2, differences from Embodiments 1 and 2 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0196] A method for manufacturing a stacked battery according to this modification will be described. The method for manufacturing a stacked battery according to this modification differs from the method for manufacturing a stacked battery according to the second embodiment in that a parallel stacked type stacked battery is manufactured using current collectors 11 having insulating layers 13 stacked on both sides and current collectors 21 having insulating layers 23 stacked on both sides.

[0197] First, in the insulating layer lamination step, insulating layers 13 are laminated on both sides of current collector 11. The positions of the insulating layers 13 laminated on both sides are the same in plan view. The method for laminating insulating layer 13 on current collector 11 may be the same as that of steps S11 and S12 described above. For example, insulating layer 13 is laminated on the side of current collector 11 on which insulating layer 13 is not laminated, as shown in FIG. 6A, 6B, or 6C.

[0198] Insulating layers 23 are laminated on both sides of current collector 21. For example, insulating layers 23 are formed on both sides of current collector 21 to match the shape of insulating layer 23 using the same method as when insulating layers 13 are laminated on both sides of current collector 11. The shape of insulating layer 23 in this case is, for example, the same pattern as insulating layer 13 described above, but narrower than insulating layer 13. In other words, insulating layer 23 is laminated so that the area of ​​insulating layer 23 is smaller than the area of ​​insulating layer 13 in a plan view.

[0199] Next, the power generating element lamination step is performed. Figures 19 and 20 are schematic cross-sectional views showing an example of a laminated electrode plate according to this modified example. Figure 21 is a schematic cross-sectional view showing an example of a multi-layer electrode plate according to this modified example. In the power generating element lamination step according to this modified example, for example, a laminated electrode plate 43a having an insulating layer 13 shown in Figure 19 and a laminated electrode plate 43b having an insulating layer 23 shown in Figure 20 are formed.

[0200] 19, an electrode active material layer 12, a solid electrolyte layer 30, and a counter electrode active material layer 22 are coated and laminated in this order on one surface of a current collector 11 having insulating layers 13 laminated on both surfaces thereof to form a laminated electrode plate 43a. That is, the power generating element 40 is laminated on one surface of the current collector 11 having insulating layers 13 laminated on both surfaces thereof so that the electrode active material layer 12 of the power generating element 40 covers the insulating layer 13. In the laminated electrode plate 43a, a coating structure is formed in which the electrode active material layer 12 covers the insulating layer 13.

[0201] 20 , a laminated electrode plate 43b is formed by coating and laminating a counter electrode active material layer 22, a solid electrolyte layer 30, and an electrode active material layer 12 in this order on one surface of a current collector 21 having insulating layers 23 laminated on both surfaces thereof. That is, the power generating element 40 is laminated on one surface of the current collector 21 having insulating layers 23 laminated on both surfaces thereof so that the counter electrode active material layer 22 of the power generating element 40 covers the insulating layer 23. In the laminated electrode plate 43b, a coating structure is formed in which the counter electrode active material layer 22 covers the insulating layer 23.

[0202] The same methods as those in steps S13, S14, and S15 described above can be used to stack the power generating element parts 40 of the laminated electrode plates 43a and 43b. Furthermore, if necessary, high-pressure pressing is performed on each of the stacked electrode active material layers 12, solid electrolyte layers 30, and counter electrode active material layers 22. Furthermore, if necessary, heat treatment is performed on each of the stacked electrode active material layers 12, solid electrolyte layers 30, and counter electrode active material layers 22.

[0203] Next, as shown in FIG. 21 , laminated electrode plates 43a and laminated electrode plates 43b are alternately stacked so that the electrode active material layer 12 of the power generation element portion 40 of the laminated electrode plate 43b covers the insulating layer 13 of the laminated electrode plate 43a, thereby forming a multilayered electrode plate 47. This also results in the insulating layer 23 of the laminated electrode plates 43b other than the lowermost laminated electrode plate 43b being covered by the counter electrode active material layer 22 of the power generation element portion 40 of the laminated electrode plate 43a. In forming the multilayered electrode plate 47, the laminated electrode plates 43a and laminated electrode plates 43b are alternately stacked so that the insulating layer 13 of each of the plurality of laminated electrode plates 43a and the insulating layer 23 of each of the plurality of laminated electrode plates 43b all overlap in a plan view. Furthermore, for example, the laminated electrode plates 43a and laminated electrode plates 43b are alternately stacked so that the entire insulating layer 23 of the region where the stacked battery 102 will ultimately be formed overlaps the insulating layer 13 in a plan view. The stacked laminated electrode plates 43a and 43b are pressed from both sides in the stacking direction, whereby the laminated electrode plates 43a and 43b are joined together to form the multi-layered electrode plate 47.

[0204] The multilayer electrode plate 47 has a structure in which a current collector 11 having insulating layers 13 laminated on both sides thereof, two power generation element units 40, and a current collector 21 having insulating layers 23 laminated on both sides thereof are laminated. The multilayer electrode plate 47 also has a structure in which the current collector 11 is sandwiched between two power generation element units 40 so that the electrode active material layers 12 cover the insulating layers 13 laminated on both sides of the current collector 11, and one of the two power generation element units 40 is sandwiched between the current collector 11 having insulating layers 13 laminated on both sides thereof and the current collector 21 having insulating layers 23 laminated on both sides thereof. As will be described in detail later, a current collector 21 having an insulating layer 23 laminated on one side thereof is laminated on the side opposite the current collector 11 side of the power generation element unit 40 located at the top.

[0205] In this modification, the multilayer electrode plate 47 has three sets of alternately stacked laminated electrode plates 43a and laminated electrode plates 43b, but the number may be one to two sets, or four or more sets.

[0206] Next, a current collector lamination step is performed. In this current collector lamination step, a current collector 21 having an insulating layer 23 formed thereon is laminated as an additional current collector on the surface of the multilayer electrode plate 47 on which the current collector 11 of the power generating element section 40 is not laminated. Specifically, as shown in Fig. 21 , the current collector 21 having the insulating layer 23 formed thereon is joined by pressing or the like to the surface of the uppermost laminate electrode plate 43a of the multiple laminate electrode plates 43a in the multilayer electrode plate 47, on the side opposite to the current collector 11 side of the power generating element section 40.

[0207] Next, a cutting process is performed. In the cutting process, the multilayer electrode plate 47, in which the current collectors 21 on which the insulating layers 23 have been formed in the current collector stacking process are stacked, is cut in the stacking direction at positions that divide the insulating layers 13 and 23. As shown in FIG. 21 , for example, the multilayer electrode plate 47, in which the current collectors 21 on which the insulating layers 23 have been formed are stacked, is cut with a blade or laser light at positions indicated by dashed lines C9, C10, C11, and C12 where the insulating layers 13 and 23 are located. At the positions indicated by dashed lines C9, C10, C11, and C12, multiple stacked electrode plates 43a and multiple stacked electrode plates 43b are stacked, and these are cut in a batch. FIG. 22 is a schematic cross-sectional view showing an example of a stacked battery according to this modification. Through this cutting process, a stacked battery 102 shown in FIG. 22 is obtained. An insulating layer 23 is formed on the lower surface of the lowermost current collector 21 of the multilayer electrode plate 47 shown in FIG. 21 , but the insulating layer 23 may be removed to form a stacked battery 102, or the stacked battery 102 may be used with the insulating layer 23 remaining.

[0208] 22, the stacked battery 102 includes a plurality of batteries 50c. The plurality of batteries 50c has the same configuration as the battery 50 according to embodiment 1, except that at least one of the current collector 11 and the current collector 21 is shared by adjacent batteries 50c.

[0209] In the stacked battery 102, the electrode layers 10 or counter electrode layers 20 of adjacent batteries 50c among the plurality of batteries 50c share a current collector 11 or a current collector 21. That is, the current collector 11 shared by the adjacent batteries 50c has electrode active material layers 12 laminated on both sides, and the current collector 21 shared by the adjacent batteries 50c has counter electrode active material layers 22 laminated on both sides. Therefore, the plurality of batteries 50c are stacked such that the electrode layers 10 or counter electrode layers 20 of adjacent batteries 50c among the plurality of batteries 50c are adjacent to each other. This makes the stacked battery 102 a parallel-stacked 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-stacked battery.

[0210] The side surfaces of the stacked battery 102 are cut surfaces formed by the above-described manufacturing method. The side surfaces of the multiple batteries 50c are flush with each other. That is, the side surfaces of the stacked battery 102 form a single flat surface. Each layer may be exposed on the side surfaces of the stacked battery 102, or a sealing member or the like may be provided.

[0211] In this way, by using the manufacturing method of the laminated battery according to this modification, it is possible to manufacture a parallel-stacked, high-capacity laminated battery 102 that exhibits the same effects as the battery 50 according to the first embodiment.

[0212] (Embodiment 3) The following describes a stacked battery according to embodiment 3. In the following description of embodiment 3, differences from embodiments 1 and 2 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0213] FIG. 23 is a cross-sectional view showing a schematic configuration of an example of a stacked battery according to this embodiment. As shown in FIG. 23, the stacked battery 104 includes a plurality of batteries 50 according to embodiment 1, and has a structure in which the plurality of batteries 50 are stacked. The plurality of batteries 50 are stacked so that the top and bottom of the batteries 50 are oriented in the same direction. The plurality of batteries 50 are stacked so that one electrode layer 10 and the other counter electrode layer 20 of adjacent batteries 50 in the stacking direction face each other and are electrically connected. In other words, the stacked battery 104 is a series-stacked stacked battery. As a result, a high-voltage stacked battery 104 can be realized using the batteries 50 according to embodiment 1.

[0214] The side surfaces of the stacked battery 104 are flat planes, in other words, the side surfaces of the multiple batteries 50 are flush with each other. Note that the multiple batteries 50 may be stacked with a misalignment in a direction perpendicular to the stacking direction in order to connect leads, etc.

[0215] The number of stacked batteries 50 is three in the illustrated example, but may be two, or may be four or more.

[0216] The stacked battery 104 is manufactured, for example, by stacking a plurality of batteries 50 so that one electrode layer 10 and the other counter electrode layer 20 of adjacent batteries 50 in the stacking direction face each other. Alternatively, the stacked battery 104 may be manufactured by stacking a plurality of stacked electrode plates 41, each including a stack of current collectors 21 on which insulating layers 23 before cutting are formed as shown in Fig. 8, and then cutting the stacked electrode plates 41 in the stacking direction at positions where the insulating layers 13 and 23 are to be separated.

[0217] The stacked battery 104 is a series-stacked stacked battery, but may also be a parallel-stacked stacked battery having a structure in which the electrode layers or counter electrode layers of adjacent cells face each other. A parallel-stacked stacked battery can achieve a high-capacity stacked battery. FIG. 24 is a cross-sectional view showing a schematic configuration of another example of a stacked battery according to the present embodiment. As shown in FIG. 24 , the stacked battery 105 includes a plurality of batteries 50 according to the first embodiment, and the plurality of batteries 50 are stacked. The plurality of batteries 50 are stacked by alternately reversing the up-down orientation of the batteries 50 in the stacking order. The plurality of batteries 50 have a structure in which the electrode layers 10 or counter electrode layers 20 of adjacent batteries 50 in the stacking direction are adjacent to each other without a solid electrolyte layer 30 sandwiched between them. The stacked battery 105 is a parallel-stacked stacked battery. By electrically connecting the electrode layers 10 and the counter electrode layers 20, a high-capacity stacked battery 105 can be achieved using the batteries 50 according to the first embodiment.

[0218] The side surfaces of the stacked battery 105 are flat planes, in other words, the side surfaces of the multiple batteries 50 are flush with each other. Note that the multiple batteries 50 may be stacked with a misalignment in a direction perpendicular to the stacking direction in order to connect leads, etc.

[0219] The number of stacked batteries 50 is six in the illustrated example, but may be two or more and five or less, or may be seven or more.

[0220] The stacked battery 105 can be manufactured, for example, by using the same method as the stacked battery 104 described above, and adjusting the orientation of the batteries 50 when stacking them.

[0221] The stacked battery according to this embodiment may also be provided with a sealing member, terminals, etc. Fig. 25 is a schematic cross-sectional view showing yet another example of the stacked battery according to this embodiment.

[0222] 25, the stacked battery 105a has a structure in which the side surfaces of the stacked battery 105 are covered with a sealing member 61, an electrode terminal 70a, and a counter electrode terminal 70b. That is, the stacked battery 105a includes the stacked battery 105, the sealing member 61, the electrode terminal 70a, and the counter electrode terminal 70b. By providing the electrode terminal 70a and the counter electrode terminal 70b for extracting current on the side surfaces of the stacked battery 105, it is not necessary to form so-called margins on the current collectors 11 and 21 for connection to connection terminals such as leads, and this makes it possible to further increase the volumetric energy density of the stacked battery 105a.

[0223] The electrode terminal 70a contacts the side surfaces of the current collector 11 and the insulating layer 13 in the electrode layer 10 of each of the multiple batteries 50. The electrode terminal 70a continuously covers the side surfaces of the current collector 11 and the insulating layer 13 in the electrode layer 10 of each of the multiple batteries 50. In the example shown in FIG. 25 , the electrode terminal 70a contacts the side surfaces of the current collector 11 and the insulating layer 13 in each of the two electrode layers 10 of adjacent batteries 50, among the multiple batteries 50. The electrode terminal 70a continuously covers the side surfaces of the current collector 11 and the insulating layer 13 in each of the two electrode layers 10 of adjacent batteries 50, among the multiple batteries 50. One or more electrode terminals 70a are provided depending on the number of stacked batteries 50 in the stacked battery 105. The electrode terminal 70a does not contact the counter electrode layer 20 of each of the multiple batteries 50.

[0224] The counter electrode terminal 70b contacts the side surfaces of the current collector 21 and the insulating layer 23 in the counter electrode layer 20 of each of the multiple 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 multiple batteries 50. In the example shown in FIG. 25 , the counter electrode terminal 70b contacts the side surfaces of the current collector 21 and the insulating layer 23 in each of the two counter electrode layers 20 of adjacent batteries 50, among the multiple batteries 50, that are adjacent to each other such that their counter electrode layers 20 are adjacent to each other. The counter electrode terminal 70b continuously covers the side surfaces of the current collector 21 and the insulating layer 23 in each of the two counter electrode layers 20 of adjacent batteries 50, among the multiple batteries 50. One or more counter electrode terminals 70b are provided depending on the number of stacked batteries 50 in the stacked battery 105. Furthermore, the counter electrode terminal 70b is not in contact with the electrode layers 10 of the plurality of batteries 50.

[0225] The electrode terminal 70a and the counter electrode terminal 70b are made of, for example, a conductive resin in which metal particles are dispersed. The electrode terminal 70a and the counter electrode terminal 70b are formed, for example, by applying a conductive resin to the side surfaces of the stacked battery 105. The multiple batteries 50 constituting the stacked battery 105 include an insulating layer 13 and an insulating layer 23. The current collector 11 and the current collector 21 are made of metal foil or the like, and therefore have high surface energy, which easily repels the material of the electrode terminal 70a and the counter electrode terminal 70b. The insulating layer 13 and the insulating layer 23 contain, for example, a resin or the like, and therefore the material of the electrode terminal 70a and the counter electrode terminal 70b has better wettability than the current collector 11 and the current collector 21. Furthermore, compared to the electrode active material layer 12 and the counter electrode active material layer 22, which are made of a mixture of active materials, the material of the electrode terminal 70a and the counter electrode terminal 70b is less likely to penetrate into the insulating layer 13 and the insulating layer 23. Therefore, it is difficult to form the electrode terminal 70a and the counter electrode terminal 70b on the side surfaces of a stacked battery composed only of the current collector 11, the current collector 21, the electrode active material layer 12, and the counter electrode active material layer 22, but it is easy to form the electrode terminal 70a and the counter electrode terminal 70b in an area including the side surfaces of the insulating layer 13 and the insulating layer 23. Furthermore, if the thicknesses of the current collector 11 and the current collector 21 are reduced to increase the volumetric energy density of the stacked battery 105a, the positions of the side surfaces of the current collector 11 and the current collector 21 become difficult to identify. However, the presence of the insulating layer 13 and the insulating layer 23 laminated on the current collector 11 and the current collector 21, respectively, makes the positions of the side surfaces of the current collector 11 and the current collector 21 easier to identify. This prevents the electrode terminal 70a, the counter electrode terminal 70b, and the sealing member 61 from being misaligned, thereby preventing short circuits and the like. From the above, when forming the electrode terminal 70a and the counter terminal 70b in the stacked battery 105, the occurrence of defective formation of the electrode terminal 70a and the counter terminal 70b can be suppressed, and a highly reliable stacked battery 105a can be formed.

[0226] The electrode terminal 70a and the counter electrode terminal 70b may be made of a conductive material other than conductive resin, such as solder, or a metal such as copper or aluminum.

[0227] The sealing member 61 covers the side surfaces of the stacked battery 105 that are not covered by the electrode terminal 70a and the counter terminal 70b. The sealing member 61 is in contact with, for example, the side surfaces of the stacked battery 105. The surfaces of the electrode terminal 70a and the counter terminal 70b opposite the stacked battery 105 are not covered by the sealing member 61 and are exposed. For example, all of the side surfaces of the stacked battery 105 are covered by either the sealing member 61, the electrode terminal 70a, or the counter terminal 70b. This increases the strength of the stacked battery 105a because the side surfaces of each layer of the stacked battery 105a are not directly exposed to the outside, thereby improving the reliability of the stacked battery 105a. Furthermore, the stacked battery 105a can be used not only enclosed in a metal case or aluminum laminate film, but also as an electronic component mounted on a circuit board, for example.

[0228] The material of the sealing member 61 may be, for example, the same as that of the above-described sealing member 60. Like the sealing member 60, the sealing member 61 may be configured with a plurality of layers.

[0229] The sealing member 61 does not have to cover all of the side surfaces that are not covered by the electrode terminal 70a and the counter electrode terminal 70b. For example, the sealing member 61 may cover the side surfaces of the electrode layer 10 and the counter electrode layer 20 that are not covered by the electrode terminal 70a and the counter electrode terminal 70b, leaving the side surfaces of the solid electrolyte layer 30 exposed. This covers the side surfaces of the electrode layer 10 and the counter electrode layer 20 with the sealing member 61, thereby suppressing short circuits. Even when the sealing member 61 is selectively formed on the side surfaces of the electrode layer 10 and the counter electrode layer 20 in this manner, for the same reasons as with the electrode terminal 70a and the counter electrode terminal 70b, the occurrence of defective formation of the sealing member 61 can be suppressed, thereby forming a highly reliable stacked battery 105a. The stacked battery 105a does not have to include the sealing member 61.

[0230] In the stacked battery 105a, leads or the like may be connected to the electrode terminal 70a and the counter electrode terminal 70b, and the leads, electrode terminal 70a, and counter electrode terminal 70b may be further covered with the sealing member 61.

[0231] Furthermore, in the laminated battery 102 according to the second embodiment, by providing such a sealing member 61, electrode terminal 70a, and counter electrode terminal 70b on the side surfaces, the same effects as those of the laminated battery 105a can be obtained.

[0232] By stacking the batteries 50, which are single cells, in this manner, a high-capacity or high-voltage stacked battery can be realized that can achieve the same effects as the batteries 50.

[0233] Although the stacked batteries 104 and 105 have a plurality of stacked batteries 50, the stacked batteries according to the present embodiment are not limited to this configuration. The stacked batteries according to the present embodiment may be a series-stacked or parallel-stacked stacked battery in which a plurality of batteries other than the battery 50, such as the battery 51, the battery 52, or the battery 53, are stacked.

[0234] (Other embodiments) While the battery, stacked battery, and manufacturing method thereof according to the present disclosure have been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as they do not deviate from the gist of the present disclosure, various modifications that would occur to those skilled in the art and other forms constructed by combining some of the components of the embodiments are also included within the scope of the present disclosure.

[0235] In the above embodiment, 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 range of allowable battery characteristics, a bonding layer or the like may be provided between each layer of the battery to reduce electrical resistance and improve bonding strength.

[0236] Furthermore, for example, in the above-described embodiment, when the battery is surrounded by a case or a substrate, and a part of the case or the substrate functions as a current collector, the battery does not need to have a current collector on the counter electrode active material layer side. In other words, the counter electrode layer may be composed of the counter electrode active material layer.

[0237] In the above embodiment, the current collector, electrode active material layer, solid electrolyte layer, and counter electrode active material layer have the same shape and position in a plan view, but this is not limiting. At least one of the current collector, electrode active material layer, solid electrolyte layer, and counter electrode active material layer may have a different shape or position in a plan view.

[0238] In the above embodiment, the power generating element is formed by sequentially stacking an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer on a current collector in the power generating element stacking step, but this is not limiting. For example, the power generating element may be formed by sequentially stacking an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer on a sheet-like substrate in the power generating element stacking step, and the formed power generating element may be removed from the substrate and stacked on a current collector.

[0239] Furthermore, the above-described embodiments can be modified, replaced, added, omitted, and the like in various ways within the scope of the claims or their equivalents. [Industrial Applicability]

[0240] The battery according to the present disclosure can be used, for example, as a secondary battery such as an all-solid-state battery used in various electronic devices or automobiles. [Explanation of symbols]

[0241] 10, 10a, 10b electrode layer 11, 11a, 21, 21a Current collector 12, 12a Electrode active material layer 12s, 22s main surface 13, 13a, 13b, 23, 23a, 23b, 23c insulating layer 20, 20a, 20b, 20c Counter electrode layer 22, 22a Counter electrode active material layer 30, 30a solid electrolyte layer 40 Power generation element 41, 41a, 41b, 42, 43a, 43b laminated plate 45, 47 Multilayer plate 50, 50a, 50c, 51, 52, 53 batteries 100, 100a, 102, 104, 105, 105a stacked battery 51s side 60, 61 Sealing member 70a electrode terminal 70b Counter terminal

Claims

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

2. a side surface of the electrode-side insulating layer and a side surface of the electrode current collector are flush with each other, a side surface of the counter electrode-side insulating layer and a side surface of the counter electrode current collector are flush with each other; The battery of claim 1 .

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

4. the electrode layer is a positive electrode layer, The counter electrode layer is a negative electrode layer. The battery according to any one of claims 1 to 3.

5. At least one of the electrode-side insulating layer and the counter-electrode-side insulating layer contains a resin. The battery of any one of claims 1 to 4.

6. At least one of the electrode-side insulating layer and the counter-electrode-side insulating layer contains a metal oxide. The battery of any one of claims 1 to 5.

7. the electrode-side insulating layer and the counter-electrode-side insulating layer are made of the same material; The battery of any one of claims 1 to 6.

8. the electrode-side insulating layer and the counter-electrode-side insulating layer each have a length of 1 mm or less in a direction from the outer periphery toward the center of the battery in a plan view; The battery according to any one of claims 1 to 7.

9. the thickness of at least one of the electrode-side insulating layer and the counter-electrode-side insulating layer is 5 μm or more; The battery of any one of claims 1 to 8.

10. a side surface of each of 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 is exposed; 10. The battery of claim 1.

11. a side surface of the electrode layer, a side surface of the counter electrode layer, and a side surface of the solid electrolyte layer are flush with each other; The battery of any one of claims 1 to 10.

12. In a plan view, the electrode active material layer and the counter electrode active material layer have the same shape and position.

12. The battery of claim 1.

13. a side surface of the battery is inclined with respect to the stacking direction in a direction such that the area of ​​the counter electrode layer is larger than the area of ​​the electrode layer in a plan view; 13. The battery of any one of claims 1 to 12.

14. The side surface of the battery is a cut surface.

14. The battery of any one of claims 1 to 13.

15. The shape of the cut surface is rectangular or trapezoidal.

15. The battery of claim 14.

16. the electrode-side insulating layer is provided on an outer periphery of the electrode layer and has a frame shape in a plan view, The counter electrode-side insulating layer is provided on the outer periphery of the counter electrode layer and has a frame shape in a plan view.

16. The battery of any one of claims 1 to 15.

17. The battery has a rectangular shape in a plan view, the electrode-side insulating layer and the counter-electrode-side insulating layer are respectively arranged along two opposing sides of the rectangle in a plan view.

16. The battery of any one of claims 1 to 15.

18. The solid electrolyte layer contains a solid electrolyte having lithium ion conductivity.

18. The battery of any one of claims 1 to 17.

19. A battery comprising a plurality of batteries according to any one of claims 1 to 18; The plurality of batteries are stacked. Stacked battery.

20. the plurality of batteries are stacked such that the electrode layers or the counter electrode layers of adjacent batteries among the plurality of batteries are adjacent to each other, The stacked battery comprises: an electrode terminal in contact with each side surface of the electrode current collector and the electrode-side insulating layer in the electrode layer; a counter electrode terminal in contact with each side surface of the counter electrode current collector and the counter electrode-side insulating layer in the counter electrode layer, The stacked battery of claim 19.

21. an insulating layer laminating step of laminating a first insulating layer on a portion of at least one surface of the first current collector; a power-generating element laminating step of laminating a power-generating element part in which an electrode active material layer, a solid electrolyte layer, and a counter electrode active material layer are laminated in this order, and the first current collector on which the first insulating layer is laminated, such that the electrode active material layer covers the first insulating layer; a current collector lamination step of laminating a second insulating layer and a second current collector on the side of the power generating element unit opposite to the first current collector side, wherein the second insulating layer and the second current collector are laminated on the power generating element unit so that the second insulating layer is sandwiched between the counter electrode active material layer and the second current collector of the power generating element unit and the first insulating layer and the second insulating layer overlap in a plan view; a cutting step of collectively cutting the first current collector, which is a stack of the first insulating layer, the power generating element unit, the second insulating layer, and the second current collector, at a position where the first insulating layer and the second insulating layer will be divided; Including, How batteries are manufactured.

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