Battery and method for manufacturing the battery

Abstract

A battery according to one aspect of the present disclosure comprises: a power generation element that has a plurality of battery cells each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, said plurality of battery cells being electrically connected in parallel and layered; an electrode insulation member that covers the electrode layers in a first region of one of a plurality of side surfaces of the power generation element; a counter electrode extraction part that covers the first region and the electrode insulation member, and is electrically connected to the counter electrode layers; a counter electrode insulation member that covers the counter electrode layers in a second region of one of the plurality of side surfaces; and an electrode extraction part that covers the second region and the counter electrode insulation member, and is electrically connected to the electrode layers, wherein the first region and the second region are located in the same side surface of the power generation element.

Description

[Technical Field]

[0001] The present disclosure relates to batteries and methods for manufacturing batteries. [Background technology]

[0002] BACKGROUND ART Conventionally, a battery in which a plurality of battery cells connected in series are connected in parallel is known (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-120717 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-198492 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for further improvements in battery characteristics compared to conventional batteries.

[0005] Therefore, the present disclosure provides a high-performance battery and a method for manufacturing the same. [Means for solving the problem]

[0006] A battery according to one embodiment of the present disclosure includes a power generating element having a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked, an electrode insulating member covering the electrode layer in a first region on one of a plurality of side surfaces of the power generating element, a counter electrode lead-out portion covering the first region and the electrode insulating member and electrically connected to the counter electrode layer, a counter electrode insulating member covering the counter electrode layer in a second region on one of the side surfaces, and an electrode lead-out portion covering the second region and the counter electrode insulating member and electrically connected to the electrode layer, the first region and the second region being located on the same side surface of the power generating element.

[0007] A battery according to another aspect of the present disclosure includes a power generating element having a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked, an electrode insulating member covering the electrode layer on a first side surface of the power generating element, a counter electrode lead-out portion covering the first side surface and the electrode insulating member and electrically connected to the counter electrode layer, a counter electrode insulating member covering the counter electrode layer on a second side surface of the power generating element, an electrode lead-out portion covering the second side surface and the counter electrode insulating member and electrically connected to the electrode layer, a counter electrode current collecting terminal connected to the counter electrode lead-out, and an electrode current collecting terminal connected to the electrode lead-out. The counter electrode current collecting terminal and the electrode current collecting terminal are provided on the same side surface of the power generating element.

[0008] A method for manufacturing a battery according to one embodiment of the present disclosure includes the steps of: preparing a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; stacking the plurality of battery cells in order so that the order of the electrode layer, the counter electrode layer, and the solid electrolyte layer alternates for each battery cell; covering the electrode layer with an electrode insulator in a first region on one of a plurality of side surfaces of the stack and covering the counter electrode layer with a counter electrode insulator in a second region on one of a plurality of side surfaces of the stack; covering the first region and the electrode insulator with a counter electrode lead-out portion electrically connected to the counter electrode layer, and covering the second region and the counter electrode insulator with an electrode lead-out portion electrically connected to the electrode layer, the first region and the second region being located on the same side surface of the stack.

[0009] A method for manufacturing a battery according to another aspect of the present disclosure includes the steps of: preparing a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; forming a stack by sequentially stacking the plurality of battery cells such that the arrangement order of the electrode layer, the counter electrode layer, and the solid electrolyte layer alternates for each battery cell; covering the electrode layer with an electrode insulating member on a first side surface of the stack and covering the counter electrode layer with a counter electrode insulating member on a second side surface of the stack; covering the first side surface and the electrode insulating member with a counter electrode lead-out portion electrically connected to the counter electrode layer and covering the second side surface and the counter electrode insulating member with an electrode lead-out portion electrically connected to the electrode layer; and providing, on the same side surface of the stack, a counter electrode current collecting terminal connected to the counter electrode lead-out portion and an electrode current collecting terminal connected to the electrode lead-out portion. [Effects of the Invention]

[0010] According to the present disclosure, a high-performance battery and a method for manufacturing the same can be provided. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a side view of a battery according to a first embodiment. [Figure 2A] FIG. 2A is a cross-sectional view of the battery according to embodiment 1. FIG. [Figure 2B] FIG. 2B is a cross-sectional view of the battery according to embodiment 1. FIG. [Figure 3A] FIG. 3A is a cross-sectional view of an example of a battery cell included in the power generating element according to embodiment 1. FIG. [Figure 3B] FIG. 3B is a cross-sectional view of another example of a battery cell included in the power generating element according to embodiment 1. FIG. [Figure 3C] FIG. 3C is a cross-sectional view of another example of a battery cell included in the power generating element according to embodiment 1. FIG. [Figure 4] FIG. 4 is a cross-sectional view of the power generating element according to the first embodiment. [Figure 5] FIG. 5 is a side view showing the positional relationship between one side surface of a power generating element according to embodiment 2 and an insulating layer provided on the side surface. [Figure 6] FIG. 6 is a side view of the battery according to the second embodiment. [Figure 7A] FIG. 7A is a cross-sectional view of a battery according to embodiment 3. FIG. [Figure 7B] FIG. 7B is a cross-sectional view of the battery according to embodiment 3. FIG. [Figure 8] FIG. 8 is a side view of the battery according to the fourth embodiment. [Figure 9A] FIG. 9A is a cross-sectional view of a battery according to embodiment 4. FIG. [Figure 9B] FIG. 9B is a cross-sectional view of the battery according to embodiment 4. As shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view of the battery according to the fifth embodiment. [Figure 11] FIG. 11 is a top view of the battery according to the fifth embodiment. [Figure 12] FIG. 12 is a side view of the battery according to the fifth embodiment. [Figure 13] FIG. 13 is a side view of the battery according to the sixth embodiment. [Figure 14A]FIG. 14A is a cross-sectional view of a battery according to embodiment 6. FIG. [Figure 14B] FIG. 14B is a cross-sectional view of the battery according to embodiment 6. As shown in FIG. [Figure 15] FIG. 15 is a cross-sectional view of a battery according to a modification of the sixth embodiment. [Figure 16] FIG. 16 is a side view of a battery according to a modification of the sixth embodiment. [Figure 17A] FIG. 17A is a cross-sectional view of a battery according to embodiment 7. FIG. [Figure 17B] FIG. 17B is a cross-sectional view of the battery according to embodiment 7. FIG. [Figure 18A] FIG. 18A is a cross-sectional view of a battery according to embodiment 8. FIG. [Figure 18B] FIG. 18B is a cross-sectional view of the battery according to the eighth embodiment. [Figure 19A] FIG. 19A is a cross-sectional view of a battery according to embodiment 9. FIG. [Figure 19B] FIG. 19B is a cross-sectional view of the battery according to embodiment 9. FIG. [Figure 20] FIG. 20 is a flowchart showing an example of a method for manufacturing a battery according to each embodiment. [Figure 21] FIG. 21 is a flowchart showing another example of the method for manufacturing the battery according to each embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (Summary of the Disclosure) A battery according to one embodiment of the present disclosure includes a power generating element having a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked, an electrode insulating member covering the electrode layer in a first region on one of a plurality of side surfaces of the power generating element, a counter electrode lead-out portion covering the first region and the electrode insulating member and electrically connected to the counter electrode layer, a counter electrode insulating member covering the counter electrode layer in a second region on one of the side surfaces, and an electrode lead-out portion covering the second region and the counter electrode insulating member and electrically connected to the electrode layer, the first region and the second region being located on the same side surface of the power generating element.

[0013] This makes it possible to realize a high-performance battery, for example, a battery that is easy to mount and highly reliable.

[0014] For example, because both the positive and negative external connection terminals are provided on the same side, the battery can be mounted compactly. Specifically, the pattern (also called footprint) of the connection terminals formed on the mounting board can be made smaller. Furthermore, because flat batteries can be mounted upright, multiple batteries can be mounted side by side in a small area.

[0015] Furthermore, while reflow soldering can be used for mounting, mounting the flat battery upright can reduce the impact of heat on the mounting board during the reflow process on the battery. Specifically, this can reduce defects such as battery delamination caused by heat. In this way, the battery's mountability can be improved.

[0016] Furthermore, for example, if a heat source is present on the mounting board during use of the product after mounting, mounting the battery upright allows the battery to be separated from the heat source. This suppresses the temperature rise of the battery, thereby improving reliability. Furthermore, since there is no need to provide a cooling fan to suppress the temperature rise of the battery, it can also contribute to the miniaturization of the entire device equipped with the battery.

[0017] Furthermore, by providing an electrode insulating member and a counter electrode insulating member on the side surface of the power generating element, it is possible to prevent short circuits between the electrode layer and the counter electrode layer. Furthermore, for example, by electrically connecting all the battery cells in parallel, it is possible to prevent overcharging or overdischarging of a specific battery cell due to variations in capacity among the battery cells. In this way, the reliability of the battery can be improved.

[0018] Furthermore, for example, the heights of the counter electrode lead-out portion and the electrode lead-out portion from the same side surface may be the same.

[0019] This allows for easy mounting on a flat surface such as a substrate, and improves the reliability of the mounting.

[0020] Furthermore, for example, the battery according to one aspect of the present disclosure may further include a sealing member that exposes at least a portion of each of the counter electrode lead-out portion and the electrode lead-out portion and seals the power generating element.

[0021] This makes it possible to protect the power generating element from the outside air, water, etc., and thus further improve the reliability of the battery.

[0022] Furthermore, for example, the battery according to one aspect of the present disclosure may further include a counter electrode current collecting terminal disposed in the first region and connected to the counter electrode lead-out portion, and an electrode current collecting terminal disposed in the second region and connected to the electrode lead-out portion.

[0023] This allows the use of materials with different properties for the lead-out portion and the current collecting terminal. For example, the material for the lead-out portion can be selected with a focus on high conductivity and alloying with the metal contained in the current collector. Furthermore, the material for the current collecting terminal can be selected with a focus on flexibility, impact resistance, chemical stability, cost, ease of spreading during installation, and other factors. In this way, the ability to select materials appropriate for each component can improve battery performance and increase the ease of battery manufacture.

[0024] A battery according to another aspect of the present disclosure includes a power generating element including a plurality of battery cells each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked, an electrode insulating member covering the electrode layer on a first side surface of the power generating element, a counter electrode lead-out portion covering the first side surface and the electrode insulating member and electrically connected to the counter electrode layer, a counter electrode insulating member covering the counter electrode layer on a second side surface of the power generating element, an electrode lead-out portion covering the second side surface and the counter electrode insulating member and electrically connected to the electrode layer, a counter electrode current collecting terminal connected to the counter electrode lead-out portion, and an electrode current collecting terminal connected to the electrode lead-out portion. The counter electrode current collecting terminal and the electrode current collecting terminal are provided on the same side surface of the power generating element.

[0025] This allows for the realization of a high-performance battery. For example, it allows for the realization of a battery with excellent mountability and reliability. In other words, in the battery according to this embodiment, both the positive and negative external connection terminals are provided on the same side, making it possible to mount the battery upright. This reduces the effects of heat during mounting or product use, thereby improving the mountability and reliability of the battery. Furthermore, since a cooling fan is no longer necessary, this can contribute to the miniaturization of the entire device incorporating the battery.

[0026] Furthermore, by providing an electrode insulating member and a counter electrode insulating member on the side surface of the power generating element, it is possible to prevent short circuits between the electrode layer and the counter electrode layer. Furthermore, for example, by electrically connecting all the battery cells in parallel, it is possible to prevent overcharging or overdischarging of a specific battery cell due to variations in capacity among the battery cells. In this way, the reliability of the battery can be improved.

[0027] Furthermore, for example, a battery according to another aspect of the present disclosure may further include an insulating layer disposed between the counter electrode current collector terminal and the electrode current collector terminal and the same side surface.

[0028] This ensures electrical insulation between the current collecting terminal and the electrode layer and counter electrode layer on the side surface on which the current collecting terminal is provided.

[0029] Furthermore, for example, the same side surface may be a side surface different from both the first side surface and the second side surface.

[0030] Furthermore, for example, the heights of the counter electrode current collecting terminal and the electrode current collecting terminal from the same side surface may be the same.

[0031] This allows for easy mounting on a flat surface such as a substrate, and improves the reliability of the mounting.

[0032] Furthermore, for example, a battery according to another aspect of the present disclosure may further include a sealing member that exposes at least a portion of the counter electrode current collector terminal and the counter electrode current collector terminal, and seals the power-generating element, the electrode lead-out portion, and the counter electrode lead-out portion.

[0033] This makes it possible to protect the power generating element from the outside air, water, etc., and thus further improve the reliability of the battery.

[0034] Furthermore, for example, the counter electrode layer may include a counter electrode current collector and a counter electrode active material layer located between the counter electrode current collector and the solid electrolyte layer. At the side surface covered by the counter electrode extraction part, the counter electrode current collector may protrude beyond the counter electrode active material layer, and the counter electrode extraction part may be in contact with a main surface of the counter electrode current collector.

[0035] As a result, at the protruding portion of the counter electrode current collector, the counter electrode lead-out part contacts not only the end face but also the main surface of the counter electrode current collector, increasing the contact area between the counter electrode lead-out part and the counter electrode current collector. This reduces the connection resistance between the counter electrode lead-out part and the counter electrode current collector, improving the large-current characteristics. For example, this enables rapid charging of the battery.

[0036] Furthermore, for example, on the side surface covered by the counter electrode extraction portion, the counter electrode active material layer may be recessed from the electrode layer.

[0037] This makes it possible to further increase the contact area between the counter electrode lead-out part and the counter electrode current collector, thereby further reducing the connection resistance between the counter electrode lead-out part and the counter electrode current collector.

[0038] Furthermore, for example, on the side surface covered by the counter electrode lead-out portion, the end face of the counter electrode current collector and the end face of the electrode layer may coincide when viewed from a direction perpendicular to the main surface.

[0039] This allows, for example, a power generating element to be easily formed by cutting a plurality of stacked battery cells at once. By using batch cutting, for example, there is no gradual increase or decrease in the film thickness at the start and end of the coating of each layer, and the areas of the electrode layer, counter electrode layer, and solid electrolyte layer are accurately determined. This reduces the capacity variation of the battery cells, thereby improving the accuracy of the battery capacity.

[0040] Furthermore, for example, the electrode insulating member may cover at least a portion of the solid electrolyte layer on the side surface covered by the counter electrode lead-out portion.

[0041] By forming the electrode insulating member so as to cover a portion of the solid electrolyte layer, it is possible to prevent the electrode layer from being exposed without being covered by the electrode insulating member even if there is variation in the size of the electrode insulating member. Furthermore, since the solid electrolyte layer is generally formed from a powder-like material, very fine irregularities exist on its end surface. This improves the adhesion strength of the electrode insulating member and improves insulation reliability. In this way, the reliability of the battery can be further improved.

[0042] Furthermore, for example, the electrode insulating member may cover from the electrode layer to at least a part of the counter electrode layer on the side surface covered by the counter electrode lead-out portion.

[0043] This allows the counter electrode layer to be partially covered, thereby sufficiently preventing the electrode layer from being exposed without being covered by the electrode insulating member. Furthermore, for example, since the counter electrode active material layer is also generally formed of a powder-like material, very fine irregularities exist on its end surface. This further improves the adhesion strength of the electrode insulating member and improves insulation reliability. This further enhances the reliability of the battery.

[0044] Furthermore, for example, the electrode insulating member may cover the electrode layer of each of the plurality of battery cells on a side surface covered by the counter electrode extraction portion, and the counter electrode extraction portion may be electrically connected to the counter electrode layer of each of the plurality of battery cells.

[0045] This allows the counter electrode lead-out portion to be used for connecting multiple battery cells in parallel. Because the counter electrode lead-out portion can be closely attached to the first side surface and the electrode insulating member, the volume of the portion involved in the parallel connection can be reduced, thereby increasing the energy density of the battery.

[0046] Furthermore, for example, the electrode insulating member may have a stripe shape in a plan view of the side surface covered by the counter electrode lead-out portion.

[0047] This allows the end faces of the electrode layers exposed in stripes on the first side surface to be effectively covered with the stripe-shaped electrode insulating members.

[0048] Furthermore, for example, the counter electrode lead-out portion may have a first conductive member in contact with the counter electrode layer, and a second conductive member covering the first conductive member.

[0049] This allows the counter electrode lead-out portion to be formed using a plurality of materials with different properties. For example, the material used for the first conductive member in contact with the counter electrode layer can be selected with a focus on high conductivity and alloying with the metal contained in the current collector. Furthermore, the material used for the second conductive member can be selected with a focus on flexibility, impact resistance, chemical stability, cost, ease of spreading during construction, and the like. In this way, the ability to select materials appropriate for each component can improve battery performance and increase the ease of battery manufacture.

[0050] Furthermore, for example, the electrode insulating member or the counter electrode insulating member may contain a resin.

[0051] This can improve the shock resistance of the battery and also alleviate stress applied to the battery due to temperature changes or expansion and contraction during charging and discharging.

[0052] A method for manufacturing a battery according to one aspect of the present disclosure includes the steps of: preparing a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; stacking the plurality of battery cells in order so that the arrangement order of the electrode layer, the counter electrode layer, and the solid electrolyte layer alternates for each battery cell; covering the electrode layer with an electrode insulator in a first region on one of a plurality of side surfaces of the stack and covering the counter electrode layer with a counter electrode insulator in a second region on one of a plurality of side surfaces of the stack; covering the first region and the electrode insulator with a counter electrode lead-out portion electrically connected to the counter electrode layer, and covering the second region and the counter electrode insulator with an electrode lead-out portion electrically connected to the electrode layer, the first region and the second region being located on the same side surface of the stack.

[0053] This makes it possible to manufacture the high-performance battery described above.

[0054] a second side surface of the stack; a counter electrode lead-out portion electrically connected to the counter electrode layer; and a second side surface of the stack; and a counter electrode lead-out portion electrically connected to the electrode layer. The second side surface of the stack includes a counter electrode lead-out portion electrically connected to the counter ... lead-out portion. The

[0055] This makes it possible to manufacture the high-performance battery described above.

[0056] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0057] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection configurations, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not described in the independent claims are described as optional components.

[0058] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0059] Furthermore, in this specification, terms indicating the relationship between elements, such as parallel or orthogonal, terms indicating the shape of elements, such as rectangular or rectangular parallelepiped, 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.

[0060] In this specification and drawings, the x-axis, y-axis, and z-axis refer to the three axes of a three-dimensional Cartesian coordinate system. When the shape of the power generating element of a battery is rectangular in plan view, the x-axis and y-axis correspond to directions parallel to a first side and a second side perpendicular to the first side of the rectangle. The z-axis corresponds to the stacking direction of the multiple battery cells included in the power generating element.

[0061] In this specification, the "stacking direction" corresponds to the direction normal to the main surfaces of the current collector and the active material layer. In this specification, the term "plan view" refers to a view perpendicular to the main surface of the power generating element, unless otherwise specified, such as when used alone. When the term "plan view of a certain surface" is used, such as "plan view of a first side surface," it refers to a view of the "certain surface" from the front.

[0062] Furthermore, in this specification, the terms "upper" and "lower" 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 a stacked configuration. Furthermore, the terms "upper" and "lower" are used not only when two components are arranged with a gap between them and another component is present between them, but also when two components are arranged closely together and are in contact with each other. In the following description, the negative side of the z axis is referred to as "lower" or "lower side," and the positive side of the z axis is referred to as "upper" or "upper side."

[0063] In addition, in this specification, the expression "covering A" means covering at least a part of "A." In other words, "covering A" is an expression that includes not only the case of "covering all of A" but also the case of "covering only a part of A." "A" is, for example, the side surface and main surface of a specific member such as a layer or a terminal.

[0064] Furthermore, in this specification, unless otherwise specified, ordinal numbers such as "first" and "second" do not refer to the number or order of components, but are used to avoid confusion between similar components and to distinguish between components.

[0065] (Embodiment 1) The configuration of the battery according to the first embodiment will be described below.

[0066] Fig. 1 is a cross-sectional view of a battery 1 according to the present embodiment. As shown in Fig. 1, the battery 1 includes a power generating element 10, an electrode insulating layer 21, a counter electrode insulating layer 22, a counter electrode lead-out part 31, and an electrode lead-out part 32. The battery 1 is, for example, an all-solid-state battery.

[0067] [1. Power generation elements] First, the specific configuration of the power generating element 10 will be described with reference to Figures 1, 2A, and 2B. Figure 2A is a cross-sectional view of the battery 1 according to this embodiment, specifically showing a cross section taken along line IIA-IIA in Figure 1. Figure 2B is a cross-sectional view of the battery 1 according to this embodiment, specifically showing a cross section taken along line IIB-IIB in Figure 1. Figure 1 shows a side surface 12 of the power generating element 10.

[0068] The shape of the power generating element 10 in a planar view is, for example, rectangular. In other words, the shape of the power generating element 10 is a flattened rectangular parallelepiped. Here, "flat" means that the thickness (i.e., the length in the z-axis direction) is shorter than each side of the main surface (i.e., the lengths in the x-axis direction and the y-axis direction) or the maximum width. The shape of the power generating element 10 in a planar view may be another polygonal shape such as a square, hexagon, or octagon, or may be a circle or an ellipse. Note that in the cross-sectional view or side view of the battery 1 or the power generating element 10, the thickness of each layer is exaggerated to make the layer structure of the power generating element 10 easier to understand.

[0069] 1, 2A, and 2B, the power generating element 10 includes four side surfaces 11, 12, 13, and 14 and two main surfaces 15 and 16. In this embodiment, the side surfaces 11, 12, 13, and 14 and the main surfaces 15 and 16 are all flat surfaces.

[0070] Side surface 11 is an example of a first side surface. Side surface 12 is an example of a second side surface. Side surfaces 11 and 12 are back-to-back and parallel to each other. Side surfaces 13 and 14 are back-to-back and parallel to each other. Side surfaces 11, 12, 13, and 14 are cut surfaces formed by, for example, cutting a stack of multiple battery cells 100 all at once.

[0071] 1, the side surface 12 includes two regions 12a and 12b. For example, when the side surface 12 is bisected by an imaginary line parallel to the z-axis, one of the two regions includes the region 12a and the other region includes the region 12b.

[0072] Regions 12a and 12b are regions used for the counter electrode lead-out and electrode lead-out of battery 1, respectively. Specifically, region 12a is an example of a first region, and is provided with an electrode insulating layer 21 and a counter electrode lead-out portion 31. Region 12b is an example of a second region that does not overlap with the first region, and is provided with a counter electrode insulating layer 22 and an electrode lead-out portion 32. In other words, counter electrode lead-out portion 31 and electrode lead-out portion 32 are provided on the same side surface 12 of power generating element 10.

[0073] The main surfaces 15 and 16 are back-to-back and parallel to each other. The main surface 15 is the top surface of the power generating element 10. The main surface 16 is the bottom surface of the power generating element 10. The main surfaces 15 and 16 have larger areas than the side surfaces 11, 12, 13, and 14, respectively.

[0074] As shown in FIGS. 1, 2A, and 2B, the power generating element 10 has a plurality of battery cells 100. The battery cell 100 is a battery with a minimum configuration and is also called a unit cell. The plurality of battery cells 100 are electrically connected in parallel and stacked. In this embodiment, all of the battery cells 100 included in the power generating element 10 are electrically connected in parallel. In the example shown in FIG. 1, the number of battery cells 100 included in the power generating element 10 is eight, but this is not limited to this. For example, the number of battery cells 100 included in the power generating element 10 may be an even number, such as two or four, or an odd number, such as three or five.

[0075] Each of the multiple battery cells 100 includes an electrode layer 110, a counter electrode layer 120, and a solid electrolyte layer 130. The electrode layer 110 has an electrode current collector 111 and an electrode active material layer 112. The counter electrode layer 120 has a counter electrode current collector 121 and a counter electrode active material layer 122. In each of the multiple battery cells 100, the electrode current collector 111, the electrode active material layer 112, the solid electrolyte layer 130, the counter electrode active material layer 122, and the counter electrode current collector 121 are stacked in this order along the z-axis.

[0076] The electrode layer 110 is one of the positive electrode layer and the negative electrode layer of the battery cell 100. The counter electrode layer 120 is the other of the positive electrode layer and the negative electrode layer of the battery cell 100. In the following, a case where the electrode layer 110 is the negative electrode layer and the counter electrode layer 120 is the positive electrode layer will be described as an example.

[0077] The multiple battery cells 100 have substantially the same configuration. In two adjacent battery cells 100, the order of the layers constituting the battery cell 100 is reversed. In other words, the multiple battery cells 100 are stacked side by side along the z-axis with the order of the layers constituting the battery cell 100 alternating. In this embodiment, since there is an even number of battery cells 100, the bottom and top layers of the power generating element 10 each serve as current collectors of the same polarity.

[0078] Below, each layer of the battery cell 100 will be described with reference to Fig. 3A. Fig. 3A is a cross-sectional view of the battery cell 100 included in the power generating element 10 according to this embodiment.

[0079] The electrode current collector 111 and the counter electrode current collector 121 are each a conductive foil-like, plate-like, or mesh-like member. The electrode current collector 111 and the counter electrode current collector 121 may each be, for example, a conductive thin film. The electrode current collector 111 and the counter electrode current collector 121 may be made of a material such as stainless steel (SUS), aluminum (Al), copper (Cu), or nickel (Ni). The electrode current collector 111 and the counter electrode current collector 121 may be made of different materials.

[0080] The thickness of each of the electrode current collector 111 and the counter electrode current collector 121 is, for example, but not limited to, 5 μm or more and 100 μm or less. An electrode active material layer 112 is in contact with a main surface of the electrode current collector 111. The electrode current collector 111 may include a current collector layer that is a layer containing a conductive material and is provided in a portion that is in contact with the electrode active material layer 112. A counter electrode active material layer 122 is in contact with a main surface of the counter electrode current collector 121. The counter electrode current collector 121 may include a current collector layer that is a layer containing a conductive material and is provided in a portion that is in contact with the counter electrode active material layer 122.

[0081] The electrode active material layer 112 is disposed on the main surface of the electrode current collector 111 facing the counter electrode layer 120. The electrode active material layer 112 contains, for example, a negative electrode active material as an electrode material. The electrode active material layer 112 is disposed opposite the counter electrode active material layer 122.

[0082] The negative electrode active material contained in the electrode active material layer 112 may be, for example, graphite, metallic lithium, or the like. As the material for the negative electrode active material, various materials capable of extracting and inserting ions such as lithium (Li) or magnesium (Mg) may be used.

[0083] The material contained in the electrode active material layer 112 may be, for example, a solid electrolyte such as an inorganic solid electrolyte. Examples of inorganic solid electrolytes that can be used include sulfide solid electrolytes and oxide solid electrolytes. Examples of sulfide solid electrolytes that can be used include a mixture of lithium sulfide (LiS) and diphosphorus pentasulfide (P2S5). Examples of materials that can be used in the electrode active material layer 112 include a conductive material such as acetylene black, or a binder for bonding such as polyvinylidene fluoride.

[0084] The electrode active material layer 112 is produced by applying a paste-like paint, in which the materials contained in the electrode active material layer 112 are kneaded together with a solvent, onto the main surface of the electrode current collector 111 and drying the paint. In order to increase the density of the electrode active material layer 112, the electrode layer 110 (also referred to as an electrode plate) including the electrode active material layer 112 and the electrode current collector 111 may be pressed after drying. The thickness of the electrode active material layer 112 is, for example, 5 μm or more and 300 μm or less, but is not limited to this.

[0085] The counter electrode active material layer 122 is disposed on the main surface of the counter electrode current collector 121 facing the electrode layer 110. The counter electrode active material layer 122 is a layer containing a positive electrode material such as an active material. The positive electrode material is a material that constitutes a counter electrode for the negative electrode material. The counter electrode active material layer 122 contains, for example, a positive electrode active material.

[0086] Possible positive electrode active materials that can be used in the counter electrode active material layer 122 include, for example, 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).Various materials that can extract and insert ions such as Li or Mg can be used as the positive electrode active material.

[0087] The counter electrode active material layer 122 may contain, for example, a solid electrolyte such as an inorganic solid electrolyte. Examples of inorganic solid electrolytes include sulfide solid electrolytes and oxide solid electrolytes. Examples of sulfide solid electrolytes include a mixture of Li2S and P2S5. The surface of the positive electrode active material may be coated with a solid electrolyte. Examples of materials that may be used in the counter electrode active material layer 122 include a conductive material such as acetylene black, or a binder such as polyvinylidene fluoride.

[0088] The counter electrode active material layer 122 is produced by applying a paste-like paint, in which the materials contained in the counter electrode active material layer 122 are kneaded together with a solvent, onto the main surface of the counter electrode current collector 121 and drying the paint. In order to increase the density of the counter electrode active material layer 122, the counter electrode layer 120 (also referred to as a counter electrode plate) including the counter electrode active material layer 122 and the counter electrode current collector 121 may be pressed after drying. The thickness of the counter electrode active material layer 122 is, for example, not less than 5 μm and not more than 300 μm, but is not limited to this.

[0089] The solid electrolyte layer 130 is disposed between the electrode active material layer 112 and the counter electrode active material layer 122. The solid electrolyte layer 130 is in contact with both the electrode active material layer 112 and the counter electrode active material layer 122. The solid electrolyte layer 130 is a layer containing an electrolyte material. A commonly known electrolyte for batteries can be used as the electrolyte material. The thickness of the solid electrolyte layer 130 may be 5 μm or more and 300 μm or less, or 5 μm or more and 100 μm or less.

[0090] The solid electrolyte layer 130 includes a solid electrolyte. For example, an inorganic solid electrolyte or other solid electrolyte may be used as the solid electrolyte. For example, a sulfide solid electrolyte or an oxide solid electrolyte may be used as the inorganic solid electrolyte. For example, a mixture of Li2S and P2S5 may be used as the sulfide solid electrolyte. In addition to the electrolyte material, the solid electrolyte layer 130 may contain a binder such as polyvinylidene fluoride.

[0091] In this embodiment, the electrode active material layer 112, the counter electrode active material layer 122, and the solid electrolyte layer 130 are maintained in the shape of parallel plates. This makes it possible to prevent cracking or collapse due to bending. Alternatively, the electrode active material layer 112, the counter electrode active material layer 122, and the solid electrolyte layer 130 may be smoothly curved together.

[0092] In this embodiment, the end face of the counter electrode layer 120 on the side surface 11 side and the end face of the electrode layer 110 on the side surface 11 side coincide with each other when viewed from the z-axis direction. Specifically, the end face of the counter electrode current collector 121 on the side surface 11 side and the end face of the electrode current collector 111 on the side surface 11 side coincide with each other when viewed from the z-axis direction. The same is true for the end faces of the counter electrode current collector 121 and the electrode current collector 111 on the side surface 12 side.

[0093] More specifically, in the battery cell 100, the electrode current collector 111, the electrode active material layer 112, the solid electrolyte layer 130, the counter electrode active material layer 122, and the counter electrode current collector 121 all have the same shape and size, and their outlines match. In other words, the shape of the battery cell 100 is a flat rectangular plate.

[0094] 1, 2A, and 2B, in this embodiment, a current collector is shared between two adjacent battery cells 100. For example, the battery cell 100 in the bottom layer and the battery cell 100 immediately above it share one electrode current collector 111.

[0095] Specifically, as shown in Figures 1, 2A, and 2B, in a plurality of battery cells 100, two adjacent electrode layers 110 share a mutual electrode current collector 111. Electrode active material layers 112 are provided on both main surfaces of the shared electrode current collector 111. Furthermore, two adjacent counter electrode layers 120 share a mutual counter electrode current collector 121. Counter electrode active material layers 122 are provided on both main surfaces of the shared counter electrode current collector 121.

[0096] Such a battery 1 is formed by combining and stacking not only the battery cell 100 shown in Fig. 3A but also the battery cells 100B and 100C shown in Fig. 3B and 3C. Note that the battery cell 100 shown in Fig. 3A will be described as battery cell 100A here.

[0097] The battery cell 100B shown in Fig. 3B has a configuration similar to that of the battery cell 100A shown in Fig. 3A, except that the electrode current collector 111 is removed. In other words, the electrode layer 110B of the battery cell 100B is composed of only the electrode active material layer 112.

[0098] The battery cell 100C shown in Fig. 3C has a configuration similar to that of the battery cell 100A shown in Fig. 3A, except that the counter electrode current collector 121 is removed. In other words, the counter electrode layer 120C of the battery cell 100C is composed of only the counter electrode active material layer 122.

[0099] FIG. 4 is a cross-sectional view showing the power generating element 10 according to this embodiment. FIG. 4 is a view of only the power generating element 10. As shown in FIG. 4, the battery cell 100A is placed in the lowest layer, and the battery cells 100B and 100C are alternately stacked upward. At this time, the battery cell 100B is stacked upside down relative to the orientation shown in FIG. 3B. In this way, the power generating element 10 is formed.

[0100] The method for forming the power generating element 10 is not limited to this. For example, the battery cell 100A may be arranged in the uppermost layer. Alternatively, the battery cell 100A may be arranged in a position different from either the uppermost or lowermost layer. Furthermore, a plurality of battery cells 100A may be used. Furthermore, a unit of two battery cells 100 that share a current collector may be formed by coating both sides of a single current collector, and the formed units may be stacked.

[0101] As described above, in the power generating element 10 according to this embodiment, all battery cells 100 are connected in parallel, and no battery cells are connected in series. This makes it less likely that unevenness in the charge / discharge state due to variations in capacity among the battery cells 100 will occur when the battery 1 is charged or discharged. This significantly reduces the risk of some of the multiple battery cells 100 being overcharged or overdischarged, thereby improving the reliability of the battery 1.

[0102] [2. Insulation layer] Next, the electrode insulating layer 21 and the counter electrode insulating layer 22 will be described.

[0103] 1, the electrode insulating layer 21 covers the electrode layer 110 in the region 12a of the side surface 12. Specifically, the electrode insulating layer 21 covers the electrode current collector 111 and the electrode active material layer 112 in the region 12a.

[0104] 1 and 2A, the electrode insulating layer 21 covers the electrode layer 110 of each of the multiple battery cells 100 in the region 12a of the side surface 12. The electrode insulating layer 21 does not cover at least a portion of the counter electrode layer 120 of each of the multiple battery cells 100. For example, the electrode insulating layer 21 does not cover the counter electrode current collector 121. Therefore, the electrode insulating layer 21 has a striped shape in a plan view of the side surface 11.

[0105] At this time, the electrode insulating layer 21 continuously covers the electrode layers 110 of the two adjacent battery cells 100. Specifically, the electrode insulating layer 21 continuously covers from at least a portion of the solid electrolyte layer 130 of one of the two adjacent battery cells 100 to at least a portion of the solid electrolyte layer 130 of the other of the two adjacent battery cells 100.

[0106] In this manner, the electrode insulating layer 21 covers at least a portion of the solid electrolyte layer 130 in the region 12a of the side surface 12. Specifically, when the side surface 12 is viewed from above, the outline of the electrode insulating layer 21 overlaps the solid electrolyte layer 130. This reduces the risk of exposing the electrode layer 110 even if the width (length in the z-axis direction) of the electrode insulating layer 21 varies due to manufacturing variations. This makes it possible to prevent a short circuit between the electrode layer 110 and the counter electrode layer 120 via the counter electrode extraction portion 31 formed to cover the electrode insulating layer 21. Furthermore, the end surface of the solid electrolyte layer 130, which is made of a powder-like material, has very fine irregularities. Therefore, the electrode insulating layer 21 penetrates into these irregularities, thereby improving the adhesion strength of the electrode insulating layer 21 and improving insulation reliability.

[0107] In the present embodiment, the electrode insulating layer 21 may cover the entire solid electrolyte layer 130 in the region 12a of the side surface 12. Specifically, the outline of the electrode insulating layer 21 may overlap the boundary between the solid electrolyte layer 130 and the counter electrode active material layer 122. It is not essential that the electrode insulating layer 21 cover a portion of the solid electrolyte layer 130. For example, the outline of the electrode insulating layer 21 may overlap the boundary between the solid electrolyte layer 130 and the electrode active material layer 112.

[0108] 1, counter electrode insulating layer 22 covers counter electrode layer 120 in region 12b of side surface 12. Specifically, counter electrode insulating layer 22 covers counter electrode current collector 121 and counter electrode active material layer 122 in region 12b.

[0109] 1 and 2B , the counter electrode insulating layer 22 covers the counter electrode layer 120 of each of the plurality of battery cells 100 in the region 12b of the side surface 12. The counter electrode insulating layer 22 does not cover at least a portion of the electrode layer 110 of each of the plurality of battery cells 100. For example, the counter electrode insulating layer 22 does not cover the electrode current collector 111. Therefore, the counter electrode insulating layer 22 has a striped shape in a plan view of the side surface 12.

[0110] At this time, the counter electrode insulating layer 22 continuously covers the counter electrode layers 120 of the two adjacent battery cells 100. Specifically, the counter electrode insulating layer 22 continuously covers from at least a portion of the solid electrolyte layer 130 of one of the two adjacent battery cells 100 to at least a portion of the solid electrolyte layer 130 of the other of the two adjacent battery cells 100.

[0111] In this manner, the counter electrode insulating layer 22 covers at least a portion of the solid electrolyte layer 130 in the region 12b of the side surface 12. Specifically, when the side surface 12 is viewed from above, the outline of the counter electrode insulating layer 22 overlaps with the solid electrolyte layer 130. This reduces the risk of the counter electrode layer 120 being exposed even if the width (length in the z-axis direction) of the counter electrode insulating layer 22 varies due to manufacturing variations. This makes it possible to prevent a short circuit between the counter electrode layer 120 and the electrode layer 110 via the electrode extraction portion 32 formed so as to cover the counter electrode insulating layer 22. Furthermore, the counter electrode insulating layer 22 fits into the irregularities on the end surface of the solid electrolyte layer 130, thereby improving the adhesion strength of the counter electrode insulating layer 22 and improving insulation reliability.

[0112] In the present embodiment, counter electrode insulating layer 22 may cover the entire solid electrolyte layer 130 in region 12b of side surface 12. Specifically, the outline of counter electrode insulating layer 22 may overlap the boundary between solid electrolyte layer 130 and electrode active material layer 112. Note that counter electrode insulating layer 22 does not necessarily have to cover a portion of solid electrolyte layer 130. For example, the outline of counter electrode insulating layer 22 may overlap the boundary between solid electrolyte layer 130 and counter electrode active material layer 122.

[0113] In addition, in the power generating element 10 according to this embodiment, the uppermost and lowermost layers are counter electrode current collectors 121. As shown in FIGS. 1 and 2B, near the upper and lower ends of the side surface 12, the counter electrode insulating layer 22 covers a portion of the main surface of the counter electrode current collector 121 located in the uppermost and lowermost layers. This makes the counter electrode insulating layer 22 resistant to external forces from the z-axis direction and prevents detachment. Furthermore, even if the electrode extraction portion 32 wraps around to the main surface 15 or 16 of the power generating element 10, it comes into contact with the counter electrode current collector 121, preventing a short circuit from occurring. In this way, the reliability of the battery 1 can be improved.

[0114] The electrode insulating layer 21 and the counter electrode insulating layer 22 are each formed using an insulating material that is electrically insulating. For example, the electrode insulating layer 21 and the counter electrode insulating layer 22 each contain a resin. The resin is, for example, an epoxy-based resin, but is not limited to this. Note that an inorganic material may also be used as the insulating material. Usable insulating materials are selected based on various properties such as flexibility, gas barrier properties, impact resistance, and heat resistance. The electrode insulating layer 21 and the counter electrode insulating layer 22 are formed using the same material, but may also be formed using different materials.

[0115] [3. Removal section] Next, the counter electrode lead-out part 31 and the electrode lead-out part 32 will be described.

[0116] 1 and 2A, the counter electrode extraction part 31 is a conductive part that covers the region 12a of the side surface 12 and the electrode insulating layer 21, and is electrically connected to the counter electrode layer 120. Specifically, the counter electrode extraction part 31 covers the electrode insulating layer 21 and a portion of the region 12a that is not covered by the electrode insulating layer 21.

[0117] 2A , in the portion of region 12a that is not covered with electrode insulating layer 21, the end faces of counter electrode current collector 121 and counter electrode active material layer 122 are exposed. Therefore, counter electrode extraction part 31 contacts the end faces of counter electrode current collector 121 and counter electrode active material layer 122 and is electrically connected to counter electrode layer 120. Because counter electrode active material layer 122 is formed from a powder-like material, it has very fine irregularities, similar to solid electrolyte layer 130. By having counter electrode extraction part 31 enter the irregularities on the end face of counter electrode active material layer 122, the adhesion strength of counter electrode extraction part 31 is improved, and the reliability of the electrical connection is improved.

[0118] The counter electrode lead-out portion 31 is electrically connected to the counter electrode layer 120 of each of the plurality of battery cells 100. In other words, the counter electrode lead-out portion 31 serves to electrically connect the battery cells 100 in parallel. As shown in Fig. 1 and Fig. 2A, the counter electrode lead-out portion 31 collectively covers almost the entire side surface 12 from the lower end to the upper end.

[0119] In the power generating element 10 according to this embodiment, the uppermost and lowermost layers are the counter electrode current collector 121. As shown in FIGS. 1 and 2A, near the upper and lower ends of the region 12a of the side surface 12, the counter electrode extraction portion 31 covers a portion of the main surface of the counter electrode current collector 121 located in the uppermost and lowermost layers. This makes the counter electrode extraction portion 31 resistant to external forces from the z-axis direction and prevents detachment. Furthermore, the contact area between the counter electrode extraction portion 31 and the counter electrode current collector 121 is increased, thereby reducing the connection resistance between the counter electrode extraction portion 31 and the counter electrode current collector 121 and improving the large-current characteristics. For example, rapid charging of the battery 1 is possible.

[0120] 1 and 2B, the electrode lead-out portion 32 is a conductive portion that covers the region 12b of the side surface 12 and the counter electrode insulating layer 22, and is electrically connected to the electrode layer 110. Specifically, the electrode lead-out portion 32 covers the counter electrode insulating layer 22 and a portion of the region 12b that is not covered by the counter electrode insulating layer 22.

[0121] 2B , the end faces of the electrode current collector 111 and the electrode active material layer 112 are exposed in the portion of region 12b that is not covered with counter electrode insulating layer 22. Therefore, electrode lead-out portion 32 contacts the end faces of the electrode current collector 111 and the electrode active material layer 112 and is electrically connected to electrode layer 110. Because electrode active material layer 112 is formed from a powder-like material, it has very fine irregularities, similar to solid electrolyte layer 130. By having electrode lead-out portion 32 enter the irregularities on the end face of electrode active material layer 112, the adhesion strength of electrode lead-out portion 32 is improved, and the reliability of the electrical connection is improved.

[0122] The electrode lead-out portion 32 is electrically connected to the electrode layer 110 of each of the plurality of battery cells 100. In other words, the electrode lead-out portion 32 serves to electrically connect the battery cells 100 in parallel. As shown in Figures 1 and 2B, the electrode lead-out portion 32 collectively covers almost the entire side surface 12 from the lower end to the upper end.

[0123] The counter electrode lead-out part 31 and the electrode lead-out part 32 are formed using a conductive resin material or the like. Alternatively, the counter electrode lead-out part 31 and the electrode lead-out part 32 may be formed using a metal material such as solder. Usable conductive materials are selected based on various properties such as flexibility, gas barrier properties, impact resistance, heat resistance, and solder wettability. The counter electrode lead-out part 31 and the electrode lead-out part 32 are formed using the same material, but may also be formed using different materials.

[0124] In this embodiment, the counter electrode lead-out part 31 and the electrode lead-out part 32 are each used as an external connection terminal for the battery 1. Specifically, the counter electrode lead-out part 31 and the electrode lead-out part 32 are connected to a wiring pattern provided on a mounting board on which the battery 1 is mounted. The connection is made by, for example, reflow soldering.

[0125] The height h1 of the counter electrode lead-out portion 31 from the side surface 12 is equal to, for example, the height h2 of the electrode lead-out portion 32 from the side surface 12. This facilitates mounting on a flat surface such as the main surface of a mounting substrate. As shown in FIG. 2A, the height h1 is the distance between the side surface 12 and the portion of the counter electrode lead-out portion 31 that is farthest from the side surface 12. As shown in FIG. 2B, the height h2 is the distance between the side surface 12 and the portion of the electrode lead-out portion 32 that is farthest from the side surface 12.

[0126] [4. Summary] As described above, in the battery 1 according to this embodiment, the counter electrode lead-out portion 31 and the electrode lead-out portion 32 are provided on the same side surface 12. In other words, because both the positive and negative external connection terminals are provided on the same side surface, the battery 1 can be mounted compactly. Specifically, the pattern (also referred to as the footprint) of the connection terminals formed on the mounting substrate can be made smaller. Furthermore, because the flat battery 1 can be mounted upright, multiple batteries 1 can be mounted side by side in a small area, for example.

[0127] Furthermore, while reflow soldering can be used for mounting, mounting the flat battery 1 upright can reduce the impact of heat on the mounting board during the reflow process on the battery. Specifically, this can reduce defects such as delamination of the battery 1 due to heat. In this way, the mountability of the battery 1 can be improved.

[0128] Furthermore, for example, if a heat source is present on the mounting board during use of the product after mounting, mounting the battery 1 upright allows the battery 1 to be separated from the heat source. This suppresses the temperature rise of the battery 1, thereby improving reliability. Furthermore, since it is no longer necessary to provide a cooling fan to suppress the temperature rise of the battery 1, it can also contribute to the miniaturization of the entire device equipped with the battery 1.

[0129] Furthermore, the electrode insulating layer 21 and the counter electrode insulating layer 22 are provided on the side surface 12 of the power generating element 10, thereby preventing short circuits between the electrode layer 110 and the counter electrode layer 120. Furthermore, for example, by electrically connecting all the battery cells 100 in parallel, it is possible to prevent a specific battery cell 100 from being overcharged or overdischarged due to variations in capacity among the battery cells. In this way, the reliability of the battery 1 can be improved.

[0130] Furthermore, the counter electrode lead-out portion 31 and the electrode lead-out portion 32 each function to connect multiple battery cells 100 in parallel. As shown in Figures 2A and 2B, the counter electrode lead-out portion 31 and the electrode lead-out portion 32 are each formed to closely cover the side surface 12 of the power generating element 10, which allows their volumes to be reduced. In other words, the volume of the terminal electrode is smaller than that of the conventionally used tab electrodes for current collection, allowing the energy density per volume of the battery 1 to be improved.

[0131] (Embodiment 2) Next, a second embodiment will be described.

[0132] The battery according to embodiment 2 differs from the battery according to embodiment 1 in the shape of the insulating layer provided on the side surface. The following description will focus on the differences from embodiment 1, and description of the commonalities will be omitted or simplified.

[0133] Fig. 5 is a side view showing the positional relationship between the side surface 12 of the power generating element 10 according to this embodiment and the side insulating layer 220 provided on the side surface 12. Fig. 6 is a side view of a battery 201 according to this embodiment. Fig. 5 shows the state of Fig. 6 with the counter electrode lead-out part 31 and the electrode lead-out part 32 removed.

[0134] As shown in FIG. 5 , a battery 201 according to this embodiment includes a side surface insulating layer 220 including an electrode insulating layer 21 and a counter electrode insulating layer 22. The side surface insulating layer 220 covers the portion between the striped electrode insulating layer 21 and the striped counter electrode insulating layer 22 and both end portions of the side surface 12 in the y-axis direction. In other words, the side surface insulating layer 220 is formed so as to expose a portion of the region 12a and a portion of the region 12b and to cover the entire remaining portion of the side surface 12. The portion of the region 12a that is not covered by the side surface insulating layer 220 is used for connecting the counter electrode lead-out portion 31 and the counter electrode layer 120. The portion of the region 12b that is not covered by the side surface insulating layer 220 is used for connecting the electrode lead-out portion 32 and the electrode layer 110.

[0135] 6 , by providing the counter electrode lead-out portion 31 and the electrode lead-out portion 32, the entire side surface 12 of the power generating element 10 is covered by either the counter electrode lead-out portion 31, the electrode lead-out portion 32, or the side surface insulating layer 220. In this way, by providing the side surface insulating layer 220, it is possible to sufficiently reduce the possibility of contact between the counter electrode lead-out portion 31 and the electrode layer 110, and the possibility of contact between the electrode lead-out portion 32 and the counter electrode layer 120. This sufficiently reduces the possibility of a short circuit occurring on the side surface 12, thereby improving the reliability of the battery 201.

[0136] (Embodiment 3) Next, a third embodiment will be described.

[0137] The battery according to embodiment 3 differs from the battery according to embodiment 1 in that the lead-out portion is formed using a plurality of different materials. The following description will focus on the differences from embodiment 1, and description of the commonalities will be omitted or simplified.

[0138] 7A and 7B are cross-sectional views of a battery 301 according to the present embodiment. The side view of the battery 301 is the same as the side view of the battery 1 shown in FIG. 1. FIG. 7A shows a cross-section of a region 12a of the battery 301 taken along line IIA-IIA in FIG. 1. FIG. 7B shows a cross-section of a region 12b of the battery 301 taken along line IIB-IIB in FIG. 1.

[0139] As shown in FIGS. 7A and 7B, battery 301 is different from battery 1 according to embodiment 1 in that it includes counter electrode lead-out portion 331 and electrode lead-out portion 332 instead of counter electrode lead-out portion 31 and electrode lead-out portion 32.

[0140] The counter electrode lead-out part 331 has a first conductive member 331a and a second conductive member 331b. The second conductive member 331b is the same as the counter electrode lead-out part 31 according to the first embodiment, except that it covers the first conductive member 331a. In the present embodiment, the second conductive member 331b is used as an external connection terminal of the battery 301.

[0141] The first conductive member 331a is a conductive member that covers at least a portion of the counter electrode layer 120 in the region 12a of the side surface 12. Specifically, the first conductive member 331a contacts and covers an end face of the counter electrode current collector 121 and a portion of the end face of the counter electrode active material layer 122. For example, the first conductive member 331a is provided for each counter electrode current collector 121, and covers the end face of the counter electrode current collector 121 in the region 12a. The first conductive member 331a has a striped shape in a plan view of the side surface 12. On the side surface 12, the first conductive members 331a and the electrode insulating layers 21 are arranged alternately one by one along the z-axis direction.

[0142] Each of the multiple first conductive members 331a is covered with and electrically connected to the second conductive member 331b. That is, the counter electrode layers 120 of the multiple battery cells 100 are electrically connected to the second conductive member 331b via each first conductive member 331a, and are electrically connected in parallel via the second conductive member 331b.

[0143] The first conductive member 331a has different properties from the second conductive member 331b. For example, the first conductive member 331a and the second conductive member 331b are formed using different materials. Specifically, the first conductive member 331a is formed using a material selected primarily for its high conductivity and its ability to be alloyed with the counter electrode current collector 121. The second conductive member 331b is formed using a material selected primarily for its flexibility, impact resistance, chemical stability, cost, ease of spreading during application, and the like.

[0144] The electrode lead-out portion 332 has a first conductive member 332a and a second conductive member 332b. The second conductive member 332b is the same as the electrode lead-out portion 32 according to the first embodiment, except that it covers the first conductive member 332a. In the present embodiment, the second conductive member 332b is used as an external connection terminal of the battery 301.

[0145] The first conductive member 332a is a conductive member that covers at least a portion of the electrode layer 110 in the region 12b of the side surface 12. Specifically, the first conductive member 332a contacts and covers an end face of the electrode current collector 111 and a portion of the end face of the electrode active material layer 112. For example, the first conductive member 332a is provided for each electrode current collector 111, and covers the end face of the electrode current collector 111 in the region 12b. The first conductive member 332a has a striped shape in a plan view of the side surface 12. On the side surface 12, the first conductive members 332a and the counter electrode insulating layers 22 are arranged alternately one by one along the z-axis direction.

[0146] Each of the multiple first conductive members 332a is covered with and electrically connected to the second conductive members 332b. That is, the electrode layers 110 of each of the multiple battery cells 100 are electrically connected to the second conductive members 332b via the respective first conductive members 332a, and are electrically connected in parallel via the second conductive members 332b.

[0147] The first conductive member 332a has different properties from the second conductive member 332b. For example, the first conductive member 332a and the second conductive member 332b are formed using different materials. Specifically, the first conductive member 332a is formed using a material selected primarily for its high conductivity and its ability to be alloyed with the electrode current collector 111. The second conductive member 332b is formed using a material selected primarily for its flexibility, impact resistance, chemical stability, cost, ease of spreading during application, and the like.

[0148] As described above, an appropriate material can be used for the lead-out portion of the battery 301, which improves the performance of the battery and makes it easier to manufacture the battery.

[0149] 7A shows an example in which the first conductive member 331a is connected to all of the counter electrode current collectors 121, but there may be counter electrode current collectors 121 to which the first conductive member 331a is not connected. The same applies to the electrode current collector 111. Furthermore, one of the first conductive members 331a and 332a may not be provided.

[0150] (Fourth embodiment) Next, a fourth embodiment will be described.

[0151] The battery according to embodiment 4 differs from the battery according to embodiment 2 in that it further includes a current collecting terminal. The following description will focus on the differences from embodiment 2, and descriptions of commonalities will be omitted or simplified.

[0152] Fig. 8 is a side view of battery 401 according to the present embodiment. Fig. 9A is a cross-sectional view of battery 401 according to the present embodiment, specifically showing a cross section taken along line IXA-IXA in Fig. 8. Fig. 9B is a cross-sectional view of battery 401 according to the present embodiment, specifically showing a cross section taken along line IXB-IXB in Fig. 8.

[0153] As shown in FIG. 8, battery 401 according to this embodiment includes a counter electrode current collector terminal 441 and an electrode current collector terminal 442, as compared with battery 201 according to the second embodiment.

[0154] The counter electrode current collecting terminal 441 is a conductive terminal connected to the counter electrode lead-out portion 31. The counter electrode current collecting terminal 441 is one of the external connection terminals of the battery 401, and in this embodiment, is the positive electrode lead-out terminal. As shown in FIGS. 8 and 9A , the counter electrode current collecting terminal 441 is disposed in the region 12a of the side surface 12 of the power generating element 10 so as to cover the surface of the counter electrode lead-out portion 31.

[0155] The electrode current collecting terminal 442 is a conductive terminal connected to the electrode lead-out portion 32. The electrode current collecting terminal 442 is one of the external connection terminals of the battery 401, and in this embodiment, is the negative electrode lead-out terminal. As shown in FIGS. 8 and 9B, the electrode current collecting terminal 442 is arranged in the region 12b of the side surface 12 of the power generating element 10 so as to cover the surface of the electrode lead-out portion 32.

[0156] Counter electrode current collector terminal 441 and electrode current collector terminal 442 are each formed using a conductive material. For example, counter electrode current collector terminal 441 and electrode current collector terminal 442 are metal foils or metal plates made of metals such as copper, aluminum, and stainless steel. Alternatively, counter electrode current collector terminal 441 and electrode current collector terminal 442 may be hardened solder.

[0157] In this embodiment, the counter electrode current collecting terminal 441 and the electrode current collecting terminal 442 are connected to a wiring pattern provided on a mounting board on which the battery 401 is mounted, instead of the counter electrode lead-out portion 31 and the electrode lead-out portion 32. The connection is made by, for example, reflow soldering.

[0158] Materials with different properties can be used for the counter electrode lead-out portion 31 and the electrode lead-out portion 32, and the counter electrode current collecting terminal 441 and the electrode current collecting terminal 442. For example, materials can be selected for the counter electrode lead-out portion 31 and the electrode lead-out portion 32 with a focus on high conductivity and alloying with the metal contained in the current collector. Materials can also be selected for the counter electrode current collecting terminal 441 and the electrode current collecting terminal 442 with a focus on heat resistance, mountability, strength, flexibility, impact resistance, chemical stability, cost, ease of spreading during construction, and the like. In this way, the ability to select materials appropriate for each component improves the performance of the battery 401 and makes it easier to manufacture the battery 401.

[0159] Furthermore, height h3 of counter electrode current collecting terminal 441 from side surface 12 is equal to height h4 of electrode current collecting terminal 442 from side surface 12, for example. This facilitates mounting on a flat surface such as the main surface of a mounting substrate. Note that height h3 is the distance between side surface 12 and the portion of counter electrode current collecting terminal 441 that is farthest from side surface 12, as shown in FIG. 9A. Height h4 is the distance between side surface 12 and the portion of electrode current collecting terminal 442 that is farthest from side surface 12, as shown in FIG. 9B.

[0160] Note that, in a plan view of the side surface 12, the counter electrode current collecting terminal 441 is provided so as to cover only a portion of the counter electrode lead-out portion 31, but it may also cover the entire counter electrode lead-out portion 31. For example, in a plan view of the side surface 12, the counter electrode current collecting terminal 441 may be larger than the counter electrode lead-out portion 31. The same applies to the electrode current collecting terminal 442. Note that the counter electrode current collecting terminal 441 and the electrode current collecting terminal 442 are arranged with a gap between them so as not to come into contact with each other.

[0161] (Embodiment 5) Next, a fifth embodiment will be described.

[0162] The battery according to embodiment 5 differs from the battery according to embodiment 1 in that an electrode lead-out portion and a counter electrode lead-out portion are provided on two different side surfaces of the power generating element. The following description will focus on the differences from embodiment 1, and description of commonalities will be omitted or simplified.

[0163] Fig. 10 is a cross-sectional view of battery 501 according to this embodiment, taken along line XX in Fig. 11. Fig. 11 is a top view of battery 501 according to this embodiment. Fig. 12 is a side view of battery 501 according to this embodiment. Specifically, Fig. 12 shows battery 501 when side surface 14 is viewed from the front.

[0164] 10 and 11 , battery 501 is different from the battery according to embodiment 1 in that it includes an electrode insulating layer 521, a counter electrode insulating layer 522, a counter electrode lead-out portion 531, and an electrode lead-out portion 532 instead of electrode insulating layer 21, counter electrode insulating layer 22, counter electrode lead-out portion 31, and electrode lead-out portion 32. Battery 501 also includes a counter electrode current collecting terminal 541 and an electrode current collecting terminal 542.

[0165] In this embodiment, the electrode insulating layer 521 and the counter electrode lead-out portion 531, and the counter electrode insulating layer 522 and the electrode lead-out portion 532 are provided on different side surfaces of the power generating element 10. Specifically, the electrode insulating layer 521 and the counter electrode lead-out portion 531 are provided on the side surface 11. The counter electrode insulating layer 522 and the electrode lead-out portion 532 are provided on the side surface 12.

[0166] The electrode insulating layer 521 covers, for example, the entire end faces of the electrode current collector 111 and the electrode active material layer 112 on the side surface 11. The electrode insulating layer 521 has a striped shape in a plan view of the side surface 11. The electrode insulating layer 521 may cover both end portions of the side surface 11 in the y-axis direction from the lower end to the upper end along the stacking direction.

[0167] Counter electrode insulating layer 522 covers, for example, the entire end faces of counter electrode current collector 121 and counter electrode active material layer 122 on side surface 12. Counter electrode insulating layer 522 has a striped shape in a plan view of side surface 12. Counter electrode insulating layer 522 may cover both end portions of side surface 12 in the y-axis direction from the lower end to the upper end along the stacking direction.

[0168] The electrode insulating layer 521 and the counter electrode insulating layer 522 differ in their positions and shapes from the electrode insulating layer 21 and the counter electrode insulating layer 22 according to embodiment 1, but have the same functions. That is, the electrode insulating layer 521 is provided to ensure insulation between the counter electrode lead-out portion 531 and the electrode layer 110. The counter electrode insulating layer 522 is provided to ensure insulation between the electrode lead-out portion 532 and the counter electrode layer 120.

[0169] The counter electrode lead-out portion 531 is provided on the side surface 11. Specifically, the counter electrode lead-out portion 531 covers the side surface 11 and the electrode insulating layer 521, and is connected to the counter electrode layer 120. More specifically, the counter electrode lead-out portion 531 is in contact with each end face of the plurality of counter electrode layers 120 that are not covered by the electrode insulating layer 521 on the side surface 11.

[0170] The width of the counter electrode extraction part 531 (i.e., the length in the y-axis direction) is approximately the same as the width of the side surface 11 (the length in the y-axis direction). In other words, compared to the battery 1 according to embodiment 1, the width of the counter electrode extraction part 531 can be increased by approximately two times. This can reduce the contact resistance between the counter electrode extraction part 531 and the counter electrode layer 120, thereby improving the large current characteristics.

[0171] The electrode lead-out portion 532 is provided on the side surface 12. Specifically, the electrode lead-out portion 532 covers the side surface 12 and the counter electrode insulating layer 522, and is connected to the electrode layer 110. More specifically, the electrode lead-out portion 532 is in contact with each end face of the plurality of electrode layers 110 on the side surface 12 that is not covered by the counter electrode insulating layer 522.

[0172] The width of electrode lead-out portion 532 (i.e., the length in the y-axis direction) is approximately the same as the width of side surface 12 (length in the y-axis direction). In other words, compared to battery 1 according to embodiment 1, the width of electrode lead-out portion 532 can be increased by approximately twice. This can reduce the contact resistance between electrode lead-out portion 532 and electrode layer 110, thereby improving large current characteristics.

[0173] As shown in Fig. 11, counter electrode current collector terminal 541 is configured to have an L-shape in top view from side surface 11 to side surface 14. Counter electrode current collector terminal 541 is formed, for example, by bending a single metal plate. This allows counter electrode current collector terminal 541 to be easily formed with high mechanical strength. Counter electrode current collector terminal 541 may also be integrally formed by joining or welding a plurality of metal plates.

[0174] As shown in Fig. 11, the electrode current collector terminal 542 is configured in an L-shape in top view from side surface 12 to side surface 14. The electrode current collector terminal 542 is formed, for example, by bending a single metal plate. This allows the electrode current collector terminal 542 to be easily formed with high mechanical strength. Note that the electrode current collector terminal 542 may also be integrally formed by joining or welding multiple metal plates.

[0175] 11 and 12, battery 501 according to the present embodiment includes side surface insulating layer 520 covering side surface 14. Side surface insulating layer 520 covers, for example, the entire side surface 14, but is not limited to this. Side surface insulating layer 520 may be disposed between counter electrode current collector terminal 541 and electrode current collector terminal 542. In a plan view of side surface 14, side surface insulating layer 520 does not have to be disposed in a position that does not overlap either counter electrode current collector terminal 541 or electrode current collector terminal 542.

[0176] The side insulating layer 520 is formed using an insulating material that is electrically insulating. For example, the side insulating layer 520 includes a resin. The resin is, for example, an epoxy-based resin, but is not limited to this. Note that an inorganic material may also be used as the insulating material. Usable insulating materials are selected based on various properties such as flexibility, gas barrier properties, impact resistance, and heat resistance. The side insulating layer 520 may be formed integrally with the electrode insulating layer 521 provided on the side surface 11 and the counter electrode insulating layer 522 provided on the side surface 12 using the same insulating material. Note that the side insulating layer 520 may also cover the side surface 13.

[0177] As described above, in battery 501 according to the present embodiment, counter electrode current collecting terminal 541 and electrode current collecting terminal 542 are provided on side surface 14, which is different from side surfaces 11 and 12 on which counter electrode lead-out portion 531 and electrode lead-out portion 532 are provided. Both the positive and negative electrode terminals of battery 501 are disposed on the same side surface 14, so battery 501 can be mounted compactly, similar to battery 1 according to embodiment 1. For example, flat battery 501 can be mounted upright, which allows a sufficient distance from a heat source and improves mountability and reliability.

[0178] Furthermore, the counter electrode lead-out portion 531 and the electrode lead-out portion 532 each function to connect multiple battery cells 100 in parallel. As shown in Fig. 10, the counter electrode lead-out portion 531 and the electrode lead-out portion 532 are formed so as to closely cover the side surfaces 11 and 12 of the power generating element 10, respectively, and therefore their volumes can be reduced. In other words, the volume of the terminal electrodes is smaller than that of conventionally used tab electrodes for current collection, and therefore the energy density per volume of the battery 501 can be improved.

[0179] (Embodiment 6) Next, a sixth embodiment will be described.

[0180] The battery according to embodiment 6 differs from the battery according to embodiment 1 in that it includes a sealing member. The following description will focus on the differences from embodiment 1, and descriptions of commonalities will be omitted or simplified.

[0181] Fig. 13 is a side view of battery 601 according to the present embodiment. Fig. 14A is a cross-sectional view of battery 601 according to the present embodiment, specifically showing a cross section taken along line XIVA-XIVA in Fig. 13. Fig. 14B is a cross-sectional view of battery 601 according to the present embodiment, specifically showing a cross section taken along line XIVB-XIVB in Fig. 13.

[0182] As shown in FIGS. 13, 14A, and 14B, battery 601 includes a sealing member 660 in comparison with battery 1 according to the first embodiment.

[0183] The sealing member 660 exposes at least a portion of each of the counter electrode lead-out portion 31 and the electrode lead-out portion 32, and seals the power generating element 10. The sealing member 660 is provided, for example, so that the power generating element 10, the electrode insulating layer 21, and the counter electrode insulating layer 22 are not exposed.

[0184] The sealing member 660 is formed, for example, using an insulating material that is electrically insulating. Examples of insulating materials that can be used include commonly known battery sealing material materials, such as sealants. Examples of insulating materials that can be used include resin materials. The insulating material may be a material that is insulating but does not have ion conductivity. For example, the insulating material may be at least one of epoxy resin, acrylic resin, polyimide resin, and silsesquioxane.

[0185] The sealing member 660 may include a plurality of different insulating materials. For example, the sealing member 660 may have a multi-layer structure. Each layer of the multi-layer structure may be formed using a different material and may have different properties.

[0186] The sealing member 660 may contain a particulate metal oxide material. Examples of the metal oxide material that can be used include silicon oxide, aluminum oxide, titanium oxide, zinc oxide, cerium oxide, iron oxide, tungsten oxide, zirconium oxide, calcium oxide, zeolite, and glass. For example, the sealing member 660 may be formed using a resin material in which a plurality of particles made of a metal oxide material are dispersed.

[0187] The particle size of the metal oxide material may be equal to or smaller than the distance between the electrode current collector 111 and the counter electrode current collector 121. The particle shape of the metal oxide material may be, for example, spherical, oval sphere, or rod-like, but is not limited to these.

[0188] By providing the sealing member 660, the reliability of the battery 601 can be improved in various respects, such as mechanical strength, short-circuit prevention, and moisture resistance.

[0189] Although an example in which battery 1 according to embodiment 1 includes sealing member 660 has been shown here, batteries according to other embodiments may also include sealing member 660. For example, battery 501 according to embodiment 5 may include sealing member 660, as in battery 602 shown in FIGS. 15 and 16. FIG. 15 is a cross-sectional view of battery 602 according to another example of the present embodiment. FIG. 16 is a side view of battery 602 according to another example of the present embodiment.

[0190] 15 and 16 , the sealing member 660 exposes the counter electrode current collecting terminal 541 and the electrode current collecting terminal 542, and covers the power generating element 10, the electrode insulating layer 521, the counter electrode insulating layer 522, the counter electrode lead-out portion 531, and the electrode lead-out portion 532. The sealing member 660 exposes only the portions of the metal plates constituting the counter electrode current collecting terminal 541 and the electrode current collecting terminal 542 that are on the side surface 14 side.

[0191] (Embodiment 7) Next, a seventh embodiment will be described.

[0192] The battery according to embodiment 7 differs from the battery according to embodiment 1 in that the current collector included in the battery cell protrudes beyond the active material layer. The following description will focus on the differences from embodiment 1, and descriptions of commonalities will be omitted or simplified.

[0193] 17A and 17B are cross-sectional views of battery 701 according to the present embodiment. The side view of battery 701 is the same as the side view of battery 1 shown in FIG. 1. FIG. 17A shows a cross-section of region 12a of battery 701 taken along line IIA-IIA in FIG. 1. FIG. 17B shows a cross-section of region 12b of battery 701 taken along line IIB-IIB in FIG. 1.

[0194] As shown in FIGS. 17A and 17B, the power generating element 10 of a battery 701 has a battery cell 700 instead of the battery cell 100 compared to the battery 1 shown in FIG.

[0195] Each of the multiple battery cells 700 includes an electrode layer 710, a counter electrode layer 720, and a solid electrolyte layer 130. The electrode layer 710 includes an electrode current collector 711 and an electrode active material layer 112. The counter electrode layer 720 includes a counter electrode current collector 721 and a counter electrode active material layer 122.

[0196] 17A, in region 12a of side surface 12, counter electrode current collector 721 protrudes beyond counter electrode active material layer 122. In the present embodiment, in region 12a of side surface 12, the end faces of counter electrode active material layer 122, solid electrolyte layer 130, electrode active material layer 112, and electrode current collector 711 are flush with each other to form a flat surface. Counter electrode current collector 721 protrudes outward from this flat surface. Note that "outward" refers to a direction away from the center of power generating element 10, and corresponds to, for example, the positive direction of the x-axis when side surface 12 is used as the reference.

[0197] Counter electrode current collector 721 protrudes, so that counter electrode extraction part 31 comes into contact with the main surface of protruding part 721a of counter electrode current collector 721. Protruding part 721a is part of counter electrode current collector 721 and is a part that is located on the positive side of the x-axis relative to the end face of counter electrode active material layer 122 on the positive side of the x-axis. This makes it possible to increase the contact area between counter electrode extraction part 31 and counter electrode current collector 721 and to reduce the connection resistance therebetween.

[0198] The amount of protrusion of counter electrode current collector 721, i.e., the length of protrusion 721a in the x-axis direction, is not particularly limited. For example, the amount of protrusion of counter electrode current collector 721 is 4.5 times or more the thickness of counter electrode current collector 721 (i.e., the length in the z-axis direction). As a result, in the present embodiment, counter electrode extraction part 31 contacts both main surfaces of protrusion 721a, and therefore the contact area can be made 10 times or more larger than when counter electrode current collector 721 does not protrude.

[0199] Alternatively, the amount of protrusion of counter electrode current collector 721 may be 9 times or more the thickness of counter electrode current collector 721. This allows the contact area to be 10 times or more larger than when counter electrode extraction part 31 is in contact with only one side of the main surface of protruding part 721a, compared to when counter electrode current collector 721 does not protrude.

[0200] In the present embodiment, the electrode current collector 711 also has a similar configuration in the region 12b of the side surface 12. That is, as shown in Fig. 17B, in the region 12b of the side surface 12, the electrode current collector 711 protrudes further than the electrode active material layer 112. In the present embodiment, in the region 12b of the side surface 12, the end faces of the electrode active material layer 112, the solid electrolyte layer 130, the counter electrode active material layer 122, and the counter electrode current collector 721 are flush with each other to form a flat surface. The electrode current collector 711 protrudes outward from the flat surface (specifically, in the positive direction of the x-axis).

[0201] The protrusion of the electrode current collector 711 brings the electrode lead-out portion 32 into contact with the main surface of the protruding portion 711a of the electrode current collector 711. The protruding portion 711a is a part of the electrode current collector 711, and is a portion located on the positive side of the x-axis relative to the end face of the electrode active material layer 112 on the positive side of the x-axis. This increases the contact area between the electrode lead-out portion 32 and the electrode current collector 711, and reduces the connection resistance therebetween.

[0202] There are no particular limitations on the amount of protrusion of electrode current collector 711, i.e., the length of protrusion 711a in the x-axis direction. For example, like counter electrode current collector 721, the amount of protrusion of electrode current collector 711 may be 4.5 times or more, or 9 times or more, the thickness of electrode current collector 711.

[0203] The protrusions 711a and 721a are formed by not disposing the counter electrode active material layer 122 or the electrode active material layer 112 at the end of the current collector. Alternatively, they are formed by forming the counter electrode active material layer 122 or the electrode active material layer 112 over the entire surface of the current collector and then removing the end. Removal is performed by, for example, cutting to a point where only the current collector remains, polishing, sandblasting, brushing, etching, or plasma irradiation. At this time, a portion of the counter electrode active material layer 122 or the electrode active material layer 112 may remain unremoved.

[0204] As described above, in the battery 701 according to this embodiment, the contact area between the current collector and the extraction portion is increased, thereby reducing the connection resistance between them. This improves the large current characteristics of the battery 701, enabling, for example, rapid charging.

[0205] In this embodiment, an example has been shown in which counter electrode current collector 721 and electrode current collector 711 each protrude, but only one of them may protrude.

[0206] (Embodiment 8) Next, an eighth embodiment will be described.

[0207] The battery according to embodiment 8 differs from the battery according to embodiment 1 in that the active material layer not covered with the insulating layer is recessed from the current collector on the side surface of the power generating element. The following description will focus on the differences from embodiment 1, and the description of the commonalities will be omitted or simplified.

[0208] 18A and 18B are cross-sectional views of a battery 801 according to this embodiment. The side view of the battery 801 is the same as the side view of the battery 1 shown in FIG. 1. FIG. 18A shows a cross-section of a region 12a of the battery 801 taken along line IIA-IIA in FIG. 1. FIG. 18B shows a cross-section of a region 12b of the battery 801 taken along line IIB-IIB in FIG. 1. As shown in FIGS. 18A and 18B, the power generating element 10 of the battery 801 has a battery cell 800 instead of the battery cell 100, as compared to the battery 1 shown in FIG. 1.

[0209] Each of the multiple battery cells 800 includes an electrode layer 810, a counter electrode layer 820, and a solid electrolyte layer 830. The electrode layer 810 includes an electrode current collector 111 and an electrode active material layer 812. The counter electrode layer 820 includes a counter electrode current collector 121 and a counter electrode active material layer 822.

[0210] 18A and 18B, in region 12a of side surface 12, counter electrode active material layer 822 is recessed from electrode layer 810. Furthermore, counter electrode active material layer 822 is recessed from counter electrode current collector 121. Specifically, counter electrode active material layer 822 is recessed inward from both electrode layer 810 and counter electrode current collector 121. Note that "inward" refers to the direction toward the center of power generating element 10, and corresponds to, for example, the negative x-axis direction when side surface 12 is used as the reference.

[0211] In the present embodiment, in region 12a of side surface 12, at least a portion of solid electrolyte layer 830 is recessed from electrode layer 810. Specifically, of the end face of solid electrolyte layer 830, the portion not covered with electrode insulating layer 21 is inclined obliquely with respect to the z-axis direction.

[0212] Counter electrode active material layer 822 is recessed, causing counter electrode current collector 121 to protrude relatively. As counter electrode current collector 121 protrudes, counter electrode extraction part 31 comes into contact with the main surface of protruding part 821a of counter electrode current collector 121. This increases the contact area between counter electrode extraction part 31 and counter electrode current collector 121, thereby reducing the connection resistance therebetween.

[0213] There are no particular limitations on the amount of recession of counter electrode active material layer 822, i.e., the amount of protrusion of counter electrode current collector 121. For example, similar to the seventh embodiment, the amount of recession of counter electrode active material layer 822 may be 4.5 times or more the thickness of counter electrode current collector 121, or may be 9 times or more the thickness of counter electrode current collector 121.

[0214] In this embodiment, the electrode active material layer 812 also has a similar configuration in the region 12b of the side surface 12. That is, in the region 12b of the side surface 12, the electrode active material layer 812 is recessed from the counter electrode layer 820. The electrode active material layer 812 is also recessed from the electrode current collector 111. Specifically, the electrode active material layer 812 is recessed inward (specifically, in the negative x-axis direction) more than both the counter electrode layer 820 and the electrode current collector 111.

[0215] In the present embodiment, in region 12b of side surface 12, at least a portion of solid electrolyte layer 830 is recessed from counter electrode layer 820. Specifically, of the end face of solid electrolyte layer 830, the portion not covered with counter electrode insulating layer 22 is inclined obliquely with respect to the z-axis direction.

[0216] The recession of the electrode active material layer 812 causes the electrode current collector 111 to protrude relatively. The protrusion of the electrode current collector 111 brings the electrode lead-out portion 32 into contact with the main surface of the protruding portion 811a of the electrode current collector 111. This increases the contact area between the electrode lead-out portion 32 and the electrode current collector 111, thereby reducing the connection resistance therebetween.

[0217] There are no particular limitations on the amount of recession of the electrode active material layer 812, i.e., the amount of protrusion of the electrode current collector 111. For example, as in the seventh embodiment, the amount of recession of the electrode active material layer 812 may be 4.5 times or more, or may be 9 times or more, the thickness of the electrode current collector 111.

[0218] The active material layer is recessed by the same method as the method for protruding the current collector in embodiment 7. For example, the active material layer is recessed by cutting to a point where only the current collector remains, grinding, sandblasting, brushing, etching, or plasma irradiation.

[0219] In this embodiment, the electrode current collector 111 and the counter electrode current collector 121 have the same size and shape in a plan view, and their contours match. Therefore, as shown in FIGS. 18A and 18B , in a cross-sectional view, the ends of the electrode current collector 111 and the counter electrode current collector 121 are aligned in the z-axis direction. Details will be described later in the description of the manufacturing method. After forming a stack by stacking multiple battery cells 100, the stack is cut all at once, so that the contours of the electrode current collector 111 and the counter electrode current collector 121 match. The end faces of the active material layers are then recessed, thereby manufacturing a battery 801 according to this embodiment. In this way, simultaneous processing such as batch cutting can be performed on each battery cell 800, thereby suppressing variations in the characteristics of each battery cell 800.

[0220] As described above, in battery 801 according to this embodiment, the contact area between the current collector and the extraction portion is increased, thereby reducing the connection resistance between them. This improves the large current characteristics of battery 801, enabling, for example, rapid charging.

[0221] In the present embodiment, the counter electrode active material layer 822 and the electrode active material layer 812 are recessed, but only one of them may be recessed. Also, the solid electrolyte layer 830 does not need to be recessed in at least one of the regions 12a and 12b of the side surface 12.

[0222] (Embodiment 9) Next, a ninth embodiment will be described.

[0223] The battery according to embodiment 9 differs from the battery according to embodiment 1 in the areas covered by the electrode insulating layer and the counter electrode insulating layer. The following description will focus on the differences from embodiment 1, and descriptions of commonalities will be omitted or simplified.

[0224] 19A and 19B are cross-sectional views of a battery 901 according to the present embodiment. As shown in Fig. 19A and 19B, battery 901 includes an electrode insulating layer 921 and a counter electrode insulating layer 922 instead of electrode insulating layer 21 and counter electrode insulating layer 22, as compared to battery 1 shown in Fig. 1.

[0225] As shown in FIG. 19A , in the region 12a of the side surface 12, the electrode insulating layer 921 covers not only the electrode layer 110 but also part of the solid electrolyte layer 130 and the counter electrode layer 120. That is, the electrode insulating layer 921 covers from the electrode layer 110 to part of the counter electrode layer 120. Specifically, the electrode insulating layer 921 covers part of the counter electrode active material layer 122. In the present embodiment, the electrode insulating layer 921 continuously covers from at least part of the counter electrode active material layer 122 of one of two adjacent battery cells 100 to at least part of the counter electrode active material layer 122 of the other of the two adjacent battery cells 100. For example, the electrode insulating layer 921 completely covers one electrode current collector 111, the electrode active material layers 112 located on both sides of the one electrode current collector 111, and two solid electrolyte layers 130. For example, when the side surface 12 is viewed from above, the outline of the electrode insulating layer 921 overlaps with the counter electrode active material layer 122.

[0226] This makes it extremely unlikely that the electrode layer 110 will be exposed even if the width (length in the z-axis direction) of the electrode insulating layer 921 varies due to manufacturing variations. This makes it possible to prevent the electrode layer 110 and the counter electrode layer 120 from being short-circuited via the counter electrode extraction part 31. Furthermore, the electrode insulating layer 921 fits into the irregularities on the end surface of the counter electrode active material layer 122, thereby improving the adhesion strength of the electrode insulating layer 921 and improving insulation reliability.

[0227] The electrode insulating layer 921 may cover the entire counter electrode active material layer 122 in the region 12a of the side surface 12. Specifically, the outline of the electrode insulating layer 921 may overlap the boundary between the counter electrode active material layer 122 and the counter electrode current collector 121.

[0228] In the present embodiment, the counter electrode insulating layer 922 also has a similar configuration in the region 12b of the side surface 12. Specifically, on the side surface 12, the counter electrode insulating layer 922 covers not only the counter electrode layer 120 but also part of the solid electrolyte layer 130 and the electrode layer 110. In other words, the counter electrode insulating layer 922 covers from the counter electrode layer 120 to part of the electrode layer 110. Specifically, the counter electrode insulating layer 922 covers part of the electrode active material layer 112. In this modification, the counter electrode insulating layer 922 continuously covers from at least part of the electrode active material layer 112 of one of two adjacent battery cells 100 to at least part of the electrode active material layer 112 of the other of the two adjacent battery cells 100. For example, the counter electrode insulating layer 922 completely covers one counter electrode current collector 121, the counter electrode active material layers 122 located on both sides of the one counter electrode current collector 121, and the two solid electrolyte layers 130.

[0229] For example, when the side surface 12 is viewed from above, the outline of the counter electrode insulating layer 922 overlaps with the electrode active material layer 112. This significantly reduces the risk of the counter electrode layer 120 being exposed even if the width (length in the z-axis direction) of the counter electrode insulating layer 922 varies due to manufacturing variations. This makes it possible to prevent a short circuit between the counter electrode layer 120 and the electrode layer 110 via the electrode lead-out portion 32. Furthermore, the counter electrode insulating layer 922 fits into the irregularities on the end surface of the electrode active material layer 112, thereby improving the adhesion strength of the counter electrode insulating layer 922 and improving insulation reliability.

[0230] The counter electrode insulating layer 922 may cover the entire electrode active material layer 112 on the side surface 12. Specifically, the outline of the counter electrode insulating layer 922 may overlap the boundary between the electrode active material layer 112 and the electrode current collector 111.

[0231] (Manufacturing method) Next, a method for manufacturing the batteries according to the above-described embodiments will be described.

[0232] 20 is a flowchart showing an example of a method for manufacturing a battery according to each embodiment. An example of the battery 1 according to embodiment 1 will be described below.

[0233] As shown in Fig. 20, first, a plurality of battery cells are prepared (S10). The prepared battery cells are, for example, the battery cells 100A, 100B, and 100C shown in Figs. 3A to 3C.

[0234] Next, the plurality of battery cells 100 are stacked (S20). Specifically, a stack is formed by stacking the plurality of battery cells 100 in order so that the arrangement order of the electrode layers 110, counter electrode layers 120, and solid electrolyte layers 130 alternates. In this embodiment, the battery cells 100A, 100B, and 100C are appropriately combined and stacked to form, for example, the power generating element 10 shown in FIG. 4. The power generating element 10 is an example of a stack.

[0235] After stacking the multiple battery cells 100, the side surfaces of the power generating element 10 may be flattened. For example, a stack of multiple battery cells 100 may be cut all at once to form a power generating element 10 with flat side surfaces. The cutting process may be performed using, for example, a blade, a laser, or a jet.

[0236] Next, insulating layers are formed on the side surfaces of the power generating element 10 (S30). Specifically, an electrode insulating layer 21 that covers the electrode layer 110 is formed in the region 12a of the side surface 12. Furthermore, a counter electrode insulating layer 22 that covers the counter electrode layer 120 is formed in the region 12b of the side surface 12.

[0237] The electrode insulating layer 21 and the counter electrode insulating layer 22 are formed, for example, by applying and curing a fluid resin material. The application is performed by an inkjet method, a spray method, a screen printing method, a gravure printing method, or the like. The curing is performed by drying, heating, light irradiation, or the like, depending on the resin material used.

[0238] When forming electrode insulating layer 21 and counter electrode insulating layer 22, a process of forming a protective member by masking with tape or resist treatment may be performed on areas where no insulating layer should be formed so as to prevent insulation of the end faces of counter electrode current collector 121 and electrode current collector 111. After forming electrode insulating layer 21 and counter electrode insulating layer 22, the protective member can be removed to ensure the conductivity of each current collector.

[0239] Next, an extraction portion is formed on the side surface of the power-generating element 10 (S40). Specifically, a counter electrode extraction portion 31 electrically connected to the plurality of counter electrode layers 120 is formed so as to cover the region 12a of the side surface 12 and the electrode insulating layer 21. An electrode extraction portion 32 electrically connecting the plurality of electrode layers 110 is formed so as to cover the region 12b of the side surface 12 and the counter electrode insulating layer 22.

[0240] For example, a conductive paste such as a conductive resin is applied and cured so as to cover the electrode insulating layer 21 and the portion of the region 12a of the side surface 12 that is not covered by the electrode insulating layer 21, thereby forming the counter electrode lead-out portion 31. Furthermore, a conductive resin is applied and cured so as to cover the counter electrode insulating layer 22 and the portion of the region 12b of the side surface 12 that is not covered by the counter electrode insulating layer 22, thereby forming the electrode lead-out portion 32. The counter electrode lead-out portion 31 and the electrode lead-out portion 32 may be formed by, for example, printing, plating, vapor deposition, sputtering, welding, soldering, bonding, or other methods.

[0241] Through the above steps, the battery 1 shown in FIG. 1 can be manufactured.

[0242] It should be noted that a step of pressing the plurality of battery cells 100 prepared in step S10 in the stacking direction may be performed individually or after stacking the plurality of battery cells.

[0243] 7A and 7B may be formed after the formation of the laminate (S20) and before the formation of the extraction portion (S40). The first conductive members 331a and 332a may be formed by, for example, printing, plating, vapor deposition, sputtering, welding, soldering, bonding, or other methods.

[0244] Furthermore, after the formation of the laminate (S20) or the formation of the insulating layer (S30), an end face recession process may be performed. Specifically, the end faces of the active material layers of the power generating element 10 are recessed to cause the current collector to protrude beyond the active material layers. More specifically, in a region 12a of the side surface 12 of the power generating element 10, the counter electrode current collector 121, which is part of the counter electrode layer 120, is made to protrude beyond the counter electrode active material layer 122, which is another part of the counter electrode layer 120. Similarly, in a region 12b of the side surface 12 of the power generating element 10, the electrode current collector 111, which is part of the electrode layer 110, is made to protrude beyond the electrode active material layer 112, which is another part of the electrode layer 110.

[0245] The end face recession treatment involves, for example, polishing, sandblasting, brushing, etching, or plasma irradiation of the side surface 12. In this case, the electrode insulating layer 21 and the counter electrode insulating layer 22 function as protective members against each treatment. For example, when sandblasting is performed on the side surface 12, the portions covered with the electrode insulating layer 21 or the counter electrode insulating layer 22 are not polished, while the portions not covered with the electrode insulating layer 21 or the counter electrode insulating layer 22, specifically, the end faces of the counter electrode layer 120 and the electrode layer 110, are scraped and recessed. At this time, the active material layer is more brittle than the current collector, and therefore is removed in greater amounts than the current collector. As a result, the counter electrode active material layer 122 recesses from the counter electrode current collector 121, and the electrode active material layer 112 recesses from the electrode current collector 111. That is, as shown in FIGS. 18A and 18B , a counter electrode active material layer 822 and an electrode active material layer 812 with recessed end faces are formed. In other words, the counter electrode current collector 121 protrudes beyond the counter electrode active material layer 822 , and the electrode current collector 111 protrudes beyond the electrode active material layer 812 .

[0246] Furthermore, although the case where the counter electrode lead-out portion 31 and the electrode lead-out portion 32 are formed on the same side surface 12 has been described, the counter electrode lead-out portion 31 and the electrode lead-out portion 32 may be formed on different side surfaces of the power generating element 10, as in the battery 501 shown in Figures 10 to 12.

[0247] Fig. 21 is a flowchart showing a method for manufacturing battery 501. As shown in Fig. 21, the steps up to the formation of the extraction portion are the same as those in the manufacturing method shown in Fig. 20. In steps S30 and S40, electrode insulating layer 521 and counter electrode extraction portion 531 are formed on side surface 11, and counter electrode insulating layer 522 and electrode extraction portion 532 are formed on side surface 12. In step S30, side surface insulating layer 520 that covers side surface 14 is formed.

[0248] Thereafter, current collecting terminals are formed on the side surfaces 14 of the power generating element 10 (S50). Specifically, a counter electrode current collecting terminal 541 is formed, covering the sides from 11 to 14. In addition, an electrode current collecting terminal 542 is formed, covering the sides from 12 to 14.

[0249] Counter electrode current collecting terminal 541 and electrode current collecting terminal 542 are formed by arranging a conductive material such as a metal material in desired areas by plating, printing, soldering, thermal spraying, etc. Alternatively, counter electrode current collecting terminal 541 and electrode current collecting terminal 542 may be formed by welding or joining folded metal plates, etc.

[0250] Furthermore, after forming the lead-out portion (S40) or after forming the current collecting terminal (S50), a sealing member 660 shown in FIGS. 13 to 16 may be formed. The sealing member 660 is formed, for example, by applying a fluid resin material and then curing it. The application is performed by an inkjet method, a spray method, a screen printing method, a gravure printing method, or the like. The curing is performed by drying, heating, light irradiation, or the like, depending on the resin material used.

[0251] (Other embodiments) While the batteries and battery manufacturing methods according to one or more aspects have been described 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 conceivable by those skilled in the art to the present embodiments and configurations constructed by combining components of different embodiments are also included within the scope of the present disclosure.

[0252] For example, although the example in which both the top and bottom layers of the power-generating element are counter electrode layers has been shown, at least one of the top and bottom layers may be an electrode layer. In this case, if a counter electrode current collector terminal is provided on the top or bottom electrode layer, an insulating counter electrode intermediate layer is required between the counter electrode current collector terminal. On the other hand, in this case, an electrode intermediate layer does not necessarily have to be provided between the electrode current collector terminal.

[0253] In addition, for example, in the above embodiment, an example was shown in which one current collector is shared between adjacent battery cells, but the current collector does not have to be shared. Two counter electrode current collectors may be overlapped, or two electrode current collectors may be overlapped.

[0254] In addition, for example, in the above embodiment, the first side surface on which the counter electrode lead-out portion is provided and the second side surface on which the electrode lead-out portion is provided are side surfaces facing each other, but this is not limiting. For example, the first side surface and the second side surface may be side surfaces adjacent to each other.

[0255] Furthermore, various modifications, substitutions, additions, omissions, etc. can be made to each of the above-described embodiments within the scope of the claims or their equivalents. [Industrial Applicability]

[0256] The present disclosure can be used, for example, as batteries for electronic devices, electrical appliances, electric vehicles, and the like. [Explanation of symbols]

[0257] 1, 201, 301, 401, 501, 601, 602, 701, 801, 901 batteries 10 Power generation elements 11, 12, 13, 14 Sides 12a, 12b area 15, 16 main surfaces 21, 521, 921 Electrode insulating layer 22, 522, 922 Counter electrode insulating layer 31, 331, 531 Counter electrode extraction part 32, 332, 532 Electrode extraction part 100, 100A, 100B, 100C, 700, 800 battery cells 110, 110B, 710, 810 electrode layer 111, 711 Electrode current collector 112, 812 Electrode active material layer 120, 120C, 720, 820 Counter electrode layer 121, 721 Counter electrode current collector 122, 822 Counter electrode active material layer 130, 830 solid electrolyte layer 220, 520 Side insulation layer 331a, 332a First conductive member 331b, 332b Second conductive member 441, 541 Counter electrode current collecting terminal 442, 542 Electrode current collecting terminal 660 Sealing member 711a, 721a, 811a, 821a protrusion

Claims

1. a power generating element including a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked; an electrode insulating member covering the electrode layer in a first region of one of the side surfaces of the power generating element; a counter electrode lead-out portion that covers the first region and the electrode insulating member and is electrically connected to the counter electrode layer; a counter electrode insulating member covering the counter electrode layer in a second region of one of the side surfaces; an electrode extraction part covering the second region and the counter electrode insulating member and electrically connected to the electrode layer, the first region and the second region are located on the same side of the power generating element; battery.

2. The heights of the counter electrode lead-out portion and the electrode lead-out portion from the same side surface are the same. The battery of claim 1 .

3. a sealing member that exposes at least a portion of each of the counter electrode lead-out portion and the electrode lead-out portion and seals the power generating element; The battery of claim 1 .

4. a counter electrode current collecting terminal disposed in the first region and connected to the counter electrode lead-out portion; an electrode current collecting terminal disposed in the second region and connected to the electrode lead-out portion, The battery of claim 1 .

5. a power generating element including a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the plurality of battery cells being electrically connected in parallel and stacked; an electrode insulating member covering the electrode layer on the first side surface of the power generating element; a counter electrode lead-out portion that covers the first side surface and the electrode insulating member and is electrically connected to the counter electrode layer; a counter electrode insulating member covering the counter electrode layer on the second side surface of the power generating element; an electrode extraction portion that covers the second side surface and the counter electrode insulating member and is electrically connected to the electrode layer; a counter electrode current collecting terminal connected to the counter electrode lead-out portion; an electrode current collecting terminal connected to the electrode lead-out portion, the counter electrode current collecting terminal and the electrode current collecting terminal are provided on the same side surface of the power generating element; battery.

6. further comprising an insulating layer disposed between the counter electrode current collecting terminal and the electrode current collecting terminal and the same side surface; The battery of claim 5.

7. The same aspect is a different aspect from both the first aspect and the second aspect. The battery of claim 5.

8. the heights of the counter electrode current collecting terminal and the electrode current collecting terminal from the same side surface are the same; The battery of claim 4.

9. the power generating element, the electrode lead-out portion, and the counter electrode lead-out portion are sealed by a sealing member that exposes at least a portion of the counter electrode current collecting terminal and the counter electrode current collecting terminal. The battery of claim 4.

10. 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, the counter electrode current collector protrudes beyond the counter electrode active material layer on the side surface covered by the counter electrode extraction part, the counter electrode extraction portion is in contact with a main surface of the counter electrode current collector, 10. The battery of claim 1.

11. the counter electrode active material layer is recessed from the electrode layer on the side surface covered by the counter electrode extraction portion; The battery of claim 10.

12. On the side surface covered by the counter electrode extraction part, an end face of the counter electrode current collector and an end face of the electrode layer coincide with each other when viewed from a direction perpendicular to the main surface. The battery of claim 10.

13. the electrode insulating member covers at least a portion of the solid electrolyte layer on the side surface covered by the counter electrode lead-out portion; 10. The battery of claim 1.

14. the electrode insulating member covers from the electrode layer to at least a portion of the counter electrode layer on the side surface covered by the counter electrode lead-out portion; 14. The battery of claim 13.

15. the electrode insulating member covers the electrode layer of each of the plurality of battery cells on a side surface that is covered by the counter electrode lead-out portion; the counter electrode lead-out portion is electrically connected to the counter electrode layer of each of the plurality of battery cells.

10. The battery of claim 1.

16. The electrode insulating member has a stripe shape in a plan view of the side surface covered by the counter electrode extraction portion.

10. The battery of claim 1.

17. The counter electrode extraction part is a first conductive member in contact with the counter electrode layer; a second conductive member covering the first conductive member, 10. The battery of claim 1.

18. The electrode insulating member or the counter electrode insulating member contains a resin.

10. The battery of claim 1.

19. providing a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; forming a stack by stacking the plurality of battery cells in order such that the arrangement order of the electrode layer, the counter electrode layer, and the solid electrolyte layer alternates for each battery cell; covering the electrode layer with an electrode insulator in a first region of one of a plurality of side surfaces of the laminate, and covering the counter electrode layer with a counter electrode insulator in a second region of one of a plurality of side surfaces of the laminate; covering the first region and the electrode insulating member with a counter electrode lead-out part electrically connected to the counter electrode layer, and covering the second region and the counter electrode insulating member with an electrode lead-out part electrically connected to the electrode layer, The first region and the second region are located on the same side of the laminate. How batteries are manufactured.

20. providing a plurality of battery cells, each including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; forming a stack by stacking the plurality of battery cells in order such that the arrangement order of the electrode layer, the counter electrode layer, and the solid electrolyte layer alternates for each battery cell; covering the electrode layer with an electrode insulator on a first side surface of the laminate and covering the counter electrode layer with a counter electrode insulator on a second side surface of the laminate; covering the first side surface and the electrode insulating member with a counter electrode lead-out portion electrically connected to the counter electrode layer, and covering the second side surface and the counter electrode insulating member with an electrode lead-out portion electrically connected to the electrode layer; and providing a counter electrode current collecting terminal connected to the counter electrode lead-out portion and an electrode current collecting terminal connected to the electrode lead-out portion on the same side surface of the laminate. How batteries are manufactured.

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