JP2020107514A - Battery and method for manufacturing the same - Google Patents

Abstract

To provide a battery increased in reliability.SOLUTION: A battery 1000 is formed by bonding together a negative electrode active material layer 110 formed on one face of a negative electrode current collector 210 and a positive electrode active material layer 120 formed on one face of a positive electrode current collector 220 through a solid electrolyte layer 130 disposed between the negative electrode active material layer 110 and the positive electrode active material layer 120. A surface of the negative electrode active material layer 110 on the side of the solid electrolyte layer 130 is smaller, in surface roughness, than a surface of the negative electrode active material layer 110 on the side of the negative electrode current collector 210. A surface of the positive electrode active material layer 120 on the side of the solid electrolyte layer 130 is smaller, in surface roughness, than a surface of the positive electrode active material layer 120 on the side of the positive electrode current collector 220.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to batteries and methods of making batteries.

Patent Document 1 discloses a power storage device that uses a current collector for a power storage device that has through holes and has irregularities.

Japanese Patent Laid-Open No. 2018-74117

In the prior art, improvement in battery reliability is desired.

Therefore, the present disclosure provides a battery or the like with improved reliability.

In the battery according to one embodiment of the present disclosure, an electrode active material layer formed on one surface of an electrode current collector and a counter electrode active material layer formed on one surface of a counter electrode current collector are the electrode active material layer and the counter electrode. A solid electrolyte layer disposed between the active material layer, a battery formed by bonding, the surface of the electrode active material layer on the solid electrolyte layer side, the surface of the electrode active material layer The surface roughness is smaller than the surface on the electrode current collector side.

A battery according to one aspect of the present disclosure is a battery in which a plurality of battery cells are stacked, and each of the plurality of battery cells includes an electrode active material layer formed on one surface of an electrode current collector and a counter electrode. A counter electrode active material layer formed on one surface of the current collector, via the solid electrolyte layer disposed between the electrode active material layer and the counter electrode active material layer, is formed by bonding, The surface of the electrode active material layer on the solid electrolyte layer side has a smaller surface roughness than the surface of the electrode active material layer on the electrode current collector side.

The method for manufacturing a battery according to an aspect of the present disclosure includes a pressing step of pressing an electrode plate including an electrode current collector and an electrode active material layer formed on one surface of the electrode current collector, and the pressing step. In, the electrode current collector pressing member that is a member that presses the electrode current collector side of the electrode plate is more than the electrode active material layer pressing member that is a member that presses the electrode active material layer side of the electrode plate. Even made of soft material.

In the method for manufacturing a battery according to one embodiment of the present disclosure, a structure in which an electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer, and a counter electrode current collector are laminated in this order is pressed. Including the pressing step, in the pressing step, the electrode current collector-side surface portion of the electrode current collector pressing member that is a member for pressing the electrode current collector side of the structure, and the counter electrode of the structure. At least one of the counter electrode current collector side surface portion of the counter electrode current collector pressing member that is a member pressing the current collector side is made of a resin material or a rubber material.

The battery manufacturing method according to an aspect of the present disclosure includes a pressing step of pressing a battery in which the plurality of battery cells are stacked via a resin-based material or a rubber-based material disposed between the plurality of battery cells. In the pressing step, the surface portion of the pressing member is made of a resin-based material or a rubber-based material, and each of the plurality of battery cells has an electrode active material layer formed on one surface of an electrode current collector, and a counter electrode. The counter electrode active material layer formed on one surface of the current collector is bonded via the solid electrolyte layer disposed between the electrode active material layer and the counter electrode active material layer.

According to the present disclosure, reliability of batteries and the like can be improved.

FIG. 1 is a diagram showing a schematic configuration of a battery according to the first embodiment. FIG. 2 is a diagram showing a conventional example of a schematic configuration of a battery. FIG. 3 is a diagram showing an example of the step of forming the negative electrode plate in the first embodiment. FIG. 4 is a diagram showing a schematic configuration of the negative electrode plate in the first embodiment. FIG. 5 is a diagram showing an example of a step of forming the positive electrode plate in the first embodiment. FIG. 6 is a diagram showing a schematic configuration of the positive electrode plate in the first embodiment. FIG. 7 is a diagram showing another example of the step of forming the negative electrode plate in the first embodiment. FIG. 8 is a diagram showing an example of a battery forming process according to the first embodiment. FIG. 9 is a diagram showing another example of the battery forming process according to the first embodiment. FIG. 10 is a diagram showing another example of the battery forming process according to the first embodiment.

(Knowledge leading to the present disclosure)
The negative electrode active material layer formed on one surface of the negative electrode current collector and the positive electrode active material layer formed on one surface of the positive electrode current collector are solids disposed between the negative electrode active material layer and the positive electrode active material layer. It is effective to reduce the weight and volume of the battery by thinning the solid electrolyte layer in order to increase the battery capacity of the battery formed by joining via the electrolyte layer. The solid electrolyte layer is required to have both electronic insulation and ionic conductivity. As the solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer becomes thinner, the distance between the positive and negative electrodes becomes smaller, and the risk of dielectric breakdown and short circuit increases.

Further, in the production of a battery, the positive electrode active material layer formed on the positive electrode current collector and the negative electrode active material layer formed on the negative electrode current collector are pressed and joined via the solid electrolyte layer. Is widely practiced. At this time, since the solid electrolyte layer is pressed from the front and back surfaces by the positive electrode active material layer and the negative electrode active material layer, the thickness distribution and surface roughness shape of the positive electrode active material layer and the negative electrode active material layer are the same as those of the solid electrolyte layer. Reflected in the surface shape, a thickness distribution is generated in the solid electrolyte layer. In addition, when the solid electrolyte layer is formed in advance on the positive electrode active material layer or the negative electrode active material layer, or when the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer are sequentially formed and laminated, The thickness distribution and surface roughness shape of the material layer and the negative electrode active material layer are reflected in the surface shape of the solid electrolyte layer.

Therefore, in order to increase the battery capacity of the battery, when the solid electrolyte layer is thinned, the positive electrode active material layer and the negative electrode active material layer and the solid electrolyte layer are joined by pressing, so that the solid electrolyte layer is partially thin. The dielectric breakdown of the solid electrolyte layer and the short circuit of the positive and negative electrodes due to the change are manifested.

The present disclosure has been made based on such knowledge, and provides a battery with improved reliability. In particular, the present disclosure provides a battery with improved reliability even when the solid electrolyte layer is thinned to increase the battery capacity of the battery.

(Outline of the present disclosure)
In the battery according to one embodiment of the present disclosure, an electrode active material layer formed on one surface of an electrode current collector and a counter electrode active material layer formed on one surface of a counter electrode current collector are the electrode active material layer and the counter electrode. A solid electrolyte layer disposed between the active material layer, a battery formed by bonding, the surface of the electrode active material layer on the solid electrolyte layer side, the surface of the electrode active material layer The surface roughness is smaller than the surface on the electrode current collector side.

Thereby, the surface of the solid electrolyte layer side in the electrode active material layer, since the surface roughness is smaller than the surface of the electrode current collector side in the electrode active material layer, the surface of the solid electrolyte layer side in the electrode active material layer The surface roughness of the surface of the solid electrolyte layer on the electrode active material layer side, which reflects the shape, is also small. Therefore, the thickness of the solid electrolyte layer is likely to be uniform, and dielectric breakdown of the solid electrolyte layer and short circuit between the positive and negative electrodes due to the partial thinning of the solid electrolyte layer are suppressed. Therefore, by reducing the thickness of the solid electrolyte layer, the reliability of the battery can be improved even when the battery has a high battery capacity.

Further, for example, in the battery, the surface shape of the electrode active material layer on the side of the electrode current collector may be the same as the surface shape of the electrode current collector on the side opposite to the electrode active material layer. ..

As a result, the surface shape of the electrode active material layer on the side of the electrode current collector and the shape of the electrode current collector match, so that the adhesion between the electrode active material layer and the electrode current collector is improved, and the reliability of the battery is improved. Can be improved.

Further, for example, the surface of the counter electrode active material layer on the side of the solid electrolyte layer may have a smaller surface roughness than the surface of the counter electrode active material layer on the side of the counter electrode current collector.

Thus, the surface of the counter electrode active material layer on the side of the solid electrolyte layer is smaller in surface roughness than the surface of the counter electrode active material layer on the side of the counter current collector, and thus the surface of the counter electrode active material layer on the side of the solid electrolyte layer. The surface roughness of the surface of the solid electrolyte layer on the counter electrode active material layer side, which reflects the shape, is also small. Therefore, the thickness of the solid electrolyte layer is likely to be uniform, and dielectric breakdown of the solid electrolyte layer and short circuit between the positive and negative electrodes due to the partial thinning of the solid electrolyte layer are suppressed. Therefore, by reducing the thickness of the solid electrolyte layer, the reliability of the battery can be improved even when the battery has a high battery capacity.

Further, for example, in the battery, the surface shape of the counter electrode active material layer on the counter electrode current collector side and the surface shape of the counter electrode current collector opposite to the counter electrode active material layer may be the same. ..

As a result, the surface shape of the counter electrode active material layer on the counter electrode current collector side matches the shape of the counter electrode current collector, so the adhesion between the counter electrode active material layer and the counter electrode current collector is improved, and the reliability of the battery is improved. Can be improved.

A battery according to one aspect of the present disclosure is a battery in which a plurality of battery cells are stacked, and each of the plurality of battery cells includes an electrode active material layer formed on one surface of an electrode current collector and a counter electrode. A counter electrode active material layer formed on one surface of the current collector, via the solid electrolyte layer disposed between the electrode active material layer and the counter electrode active material layer, is formed by bonding, The surface of the electrode active material layer on the solid electrolyte layer side has a smaller surface roughness than the surface of the electrode active material layer on the electrode current collector side.

Thereby, the surface of the solid electrolyte layer side in the electrode active material layer, since the surface roughness is smaller than the surface of the electrode current collector side in the electrode active material layer, the surface of the solid electrolyte layer side in the electrode active material layer The surface roughness of the surface of the solid electrolyte layer on the electrode active material layer side, which reflects the shape, is also small. Therefore, the thickness of the solid electrolyte layer is likely to be uniform, and dielectric breakdown of the solid electrolyte layer and short circuit between the positive and negative electrodes due to the partial thinning of the solid electrolyte layer are suppressed. Therefore, by thinning the solid electrolyte layer, the reliability of a battery in which a plurality of battery cells are stacked can be improved even when each battery cell has a high battery capacity.

Further, for example, in the battery, the surface of the counter electrode active material layer on the solid electrolyte layer side may have a smaller surface roughness than the surface of the counter electrode active material layer on the counter electrode current collector side.

Thus, the surface of the counter electrode active material layer on the side of the solid electrolyte layer is smaller in surface roughness than the surface of the counter electrode active material layer on the side of the counter current collector, and thus the surface of the counter electrode active material layer on the side of the solid electrolyte layer. The surface roughness of the surface of the solid electrolyte layer on the counter electrode active material layer side, which reflects the shape, is also small. Therefore, the thickness of the solid electrolyte layer is likely to be uniform, and dielectric breakdown of the solid electrolyte layer and short circuit between the positive and negative electrodes due to the partial thinning of the solid electrolyte layer are suppressed. Therefore, by thinning the solid electrolyte layer, the reliability of a battery in which a plurality of battery cells are stacked can be improved even when each battery cell has a high battery capacity.

Further, for example, in the battery, the plurality of battery cells may be laminated with a resin-based material or a rubber-based material interposed between the battery cells.

As a result, the resin-based material or rubber-based material is usually softer than the materials contained in the electrode active material layer and the counter electrode active material layer, and the hardness can be easily adjusted. In such a case, the electrode active material layer and the counter electrode active material layer are pushed into the resin-based material or the rubber-based material side. Therefore, it is possible to suppress local thinning of the solid electrolyte layer due to uneven thickness of the electrode active material layer and the counter electrode active material layer. As a result, it is possible to suppress the risk of a short circuit in a battery in which a plurality of battery cells are stacked and to easily manufacture a battery in which a plurality of battery cells are stacked.

The method for manufacturing a battery according to an aspect of the present disclosure includes a pressing step of pressing an electrode plate including an electrode current collector and an electrode active material layer formed on one surface of the electrode current collector, and the pressing step. In, the electrode current collector pressing member that is a member that presses the electrode current collector side of the electrode plate is more than the electrode active material layer pressing member that is a member that presses the electrode active material layer side of the electrode plate. Even made of soft material.

Thereby, the electrode active material layer press member is a relatively soft material, and the electrode current collector press member is a relatively hard material. Therefore, in the pressing step, even if the surface of the surface of the electrode active material layer opposite to the electrode current collector has a large surface roughness, the surface of the electrode active material layer side becomes a hard electrode active material layer pressing member. When pressed, it becomes relatively smooth, and at the same time, the unevenness due to the large surface roughness of the electrode active material layer is pushed through the electrode current collector into the soft electrode current collector pressing member on the electrode current collector side. .. When a solid electrolyte layer is further laminated on the electrode active material layer, the relatively smooth surface of the electrode active material layer is reflected, and the surface of the solid electrolyte layer is also relatively smooth, and the thickness tends to be uniform. Therefore, since the dielectric breakdown of the solid electrolyte layer and the short circuit of the positive and negative electrodes due to the partial thinning of the solid electrolyte layer is suppressed, when the battery has a high battery capacity by thinning the solid electrolyte layer. Even with this, a battery with improved reliability can be manufactured.

Further, for example, in the method for manufacturing the battery, the surface portion of the electrode current collector pressing member on the electrode current collector side may be made of a resin material or a rubber material.

As a result, the resin-based material or rubber-based material is usually a softer material than steel materials used for press members, and the shape and hardness can be easily adjusted. I can prepare.

In the method for manufacturing a battery according to one embodiment of the present disclosure, a structure in which an electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer, and a counter electrode current collector are laminated in this order is pressed. Including the pressing step, in the pressing step, the electrode current collector-side surface portion of the electrode current collector pressing member that is a member for pressing the electrode current collector side of the structure, and the counter electrode of the structure. At least one of the counter electrode current collector side surface portion of the counter electrode current collector pressing member that is a member pressing the current collector side is made of a resin material or a rubber material.

Thereby, at least one of the surface portion of the electrode current collector side of the electrode current collector press member and the counter electrode current collector side surface of the counter electrode current collector press member is a relatively soft resin-based material or rubber-based material. It becomes a material. Therefore, in the pressing step, even when the surface roughness of the solid electrolyte layer side in the electrode active material layer and the counter electrode active material layer is large, the solid electrolyte layer side of the electrode active material layer and the counter electrode active material layer is large. At least one of the unevenness due to the large surface roughness of the surface is pressed into the surface of the press member made of a relatively soft material via the electrode current collector or the counter electrode current collector. Thereby, at least one of the surfaces on the solid electrolyte layer side in the electrode active material layer and the counter electrode active material layer becomes relatively smooth, and the surface of the solid electrolyte layer in contact with the electrode active material layer and the counter electrode active material layer is also relatively smooth. Therefore, the thickness is likely to be uniform. Therefore, since the dielectric breakdown of the solid electrolyte layer and the short circuit of the positive and negative electrodes due to the partial thinning of the solid electrolyte layer is suppressed, when the battery has a high battery capacity by thinning the solid electrolyte layer. Even with this, a battery with improved reliability can be manufactured.

The battery manufacturing method according to an aspect of the present disclosure includes a pressing step of pressing a battery in which the plurality of battery cells are stacked via a resin-based material or a rubber-based material disposed between the plurality of battery cells. In the pressing step, the surface portion of the pressing member is made of a resin-based material or a rubber-based material, and each of the plurality of battery cells has an electrode active material layer formed on one surface of an electrode current collector, and a counter electrode. The counter electrode active material layer formed on one surface of the current collector is bonded via the solid electrolyte layer disposed between the electrode active material layer and the counter electrode active material layer.

As a result, the surface portion of the press member and the material arranged between the plurality of battery cells become a relatively soft resin material or rubber material. Therefore, in the pressing step, even when the surface roughness of the solid electrolyte layer side in the electrode active material layer and the counter electrode active material layer is large, the solid electrolyte layer side of the electrode active material layer and the counter electrode active material layer is large. The unevenness due to the large surface roughness of the surface is pushed into the surface of the relatively soft resin-based material or rubber-based material through the electrode current collector and the counter electrode current collector. Thereby, the surface of the solid electrolyte layer side in the electrode active material layer and the counter electrode active material layer becomes relatively smooth, and the surface of the solid electrolyte layer in contact with the electrode active material layer and the counter electrode active material layer is also relatively smooth, and the thickness Tends to be uniform. Therefore, the dielectric breakdown of the solid electrolyte layer and the short circuit between the positive and negative electrodes due to the partial thinning of the solid electrolyte layer are suppressed.Thus, by thinning the solid electrolyte layer, each battery cell has a high battery capacity. Even in such a case, it is possible to manufacture a battery in which a plurality of battery cells having improved reliability are stacked.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Further, among the constituent elements in the following embodiments, constituent elements not described in independent claims are described as arbitrary constituent elements.

Further, each drawing is a schematic diagram in which emphasis, omission, or ratio adjustment is appropriately performed to show the present disclosure, and is not necessarily strictly illustrated, and the actual shape, positional relationship, and ratio are May be different. Therefore, for example, the scales and the like in the drawings do not necessarily match. Further, in each drawing, substantially the same configurations are denoted by the same reference numerals, and overlapping description will be omitted or simplified.

Further, in the present specification, terms indicating a relationship between elements such as parallelism and shape matching, and terms indicating a shape of an element such as a rectangle, and a numerical range are not expressions expressing only a strict meaning, It is an expression that includes a substantially equivalent range, for example, a difference of about several percent.

In addition, in this specification and the drawings, the x-axis, the y-axis, and the z-axis represent the three axes of the three-dimensional orthogonal coordinate system. In each embodiment, the z-axis direction is the battery thickness direction. In addition, in the present specification, the “thickness direction” is a direction perpendicular to the surface on which the layers are stacked. In addition, the “thickness” in the present specification is the length in the stacking direction of the battery and each layer.

(Embodiment 1)
FIG. 1 is a sectional view showing a schematic configuration of a battery 1000 according to the first embodiment.

As shown in FIG. 1, the battery 1000 according to the first embodiment includes a negative electrode active material layer 110 formed on one surface of a negative electrode current collector 210 and a positive electrode active material layer formed on one surface of a positive electrode current collector 220. 120 and the negative electrode active material layer 110 and the positive electrode active material layer 120 are joined together via the solid electrolyte layer 130. The surface of the negative electrode active material layer 110 on the solid electrolyte layer 130 side has a smaller surface roughness than the surface of the negative electrode active material layer 110 on the negative electrode current collector 210 side. The surface of the positive electrode active material layer 120 on the solid electrolyte layer 130 side has a smaller surface roughness than the surface of the positive electrode active material layer 120 on the positive electrode current collector 220 side. In the battery 1000, the surface shape of the negative electrode active material layer 110 on the negative electrode current collector 210 side and the surface shape of the negative electrode current collector 210 on the opposite side to the negative electrode active material layer 110 are the same. Further, the surface shape of the positive electrode active material layer 120 on the side of the positive electrode current collector 220 and the surface shape of the positive electrode current collector 220 on the side opposite to the positive electrode active material layer 120 are the same. The negative electrode active material layer 110 is an example of an electrode active material layer, the negative electrode current collector 210 is an example of an electrode current collector, the positive electrode active material layer 120 is an example of a counter electrode active material layer, and the positive electrode current collector. Body 220 is an example of a counter electrode current collector. The negative electrode active material layer 110 may be an example of a counter electrode active material layer, the negative electrode current collector 210 may be an example of a counter electrode current collector, and the positive electrode active material layer 120 is an example of an electrode active material layer. The positive electrode current collector 220 may be an example of a counter electrode current collector. The surface roughness is, for example, the roughness calculated as the arithmetic average roughness Ra, and other methods such as the maximum height Ry and the ten-point average roughness Rz may be used depending on the purpose and shape. Good. In addition, in the present specification, that the surface shapes are the same means that the positions and heights of the surface irregularities are the same.

Further, the battery 1000 includes the power generation element 100, the negative electrode current collector 210, and the positive electrode current collector 220.

The power generation element 100 is arranged between the negative electrode current collector 210 and the positive electrode current collector 220. As shown in FIG. 1, the power generation element 100 includes a negative electrode active material layer 110 and a positive electrode active material layer 120. The power generation element 100 further includes a solid electrolyte layer 130. The negative electrode active material layer 110, the solid electrolyte layer 130, and the positive electrode active material layer 120 are laminated in this order from the negative electrode current collector 210 side along the thickness direction (z-axis direction) of the battery 1000.

The negative electrode active material layer 110 contains, for example, a negative electrode active material as an electrode material. The negative electrode active material layer 110 is arranged to face the positive electrode active material layer 120.

As the negative electrode active material contained in the negative electrode active material layer 110, for example, a negative electrode active material such as graphite or metallic lithium can be used. As a material of the negative electrode active material, various materials capable of releasing and inserting ions such as lithium (Li) or magnesium (Mg) can be used.

Further, as the material contained in the negative electrode active material layer 110, for example, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, for example, a sulfide solid electrolyte or an oxide solid electrolyte may be used. As the sulfide solid electrolyte, for example, a mixture of lithium sulfide (Li ₂ S) and phosphorus pentasulfide (P ₂ S ₅ ) can be used. Further, as the material contained in the negative electrode active material layer 110, for example, a conductive material such as acetylene black, Ketjen black, carbon black, graphite, carbon fiber, or a binding binder such as polyvinylidene fluoride may be used. Good. Examples of other binders include butadiene rubber, isoprene rubber, styrene-butadiene rubber (SBR), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), ethylene- Propylene rubber, butyl rubber, chloroprene rubber, acrylonitrile-butadiene rubber, acrylic rubber, silicone rubber, synthetic rubber such as fluororubber and urethane rubber, polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), polyimide, polyamide, Examples thereof include polyamide imide, polyvinyl alcohol, chlorinated polyethylene (CPE) and the like.

The negative electrode active material layer 110 can be produced, for example, by applying a paste-like coating material in which the material contained in the negative electrode active material layer 110 is kneaded together with a solvent onto the surface of the negative electrode current collector 210 and drying. In order to increase the density of the negative electrode active material layer 110, the negative electrode plate including the negative electrode active material layer 110 and the negative electrode current collector 210 may be pressed after drying. The thickness of the negative electrode active material layer 110 is, for example, 5 μm or more and 300 μm or less, but is not limited to this.

The positive electrode active material layer 120 is a layer containing a positive electrode material such as an active material. The positive electrode material is a material forming the counter electrode of the negative electrode material. The positive electrode active material layer 120 contains, for example, a positive electrode active material.

Examples of the positive electrode active material contained in the positive electrode active material layer 120 include lithium cobalt oxide composite oxide (LCO), lithium nickel oxide composite oxide (LNO), lithium manganate composite oxide (LMO), and lithium-manganese. -Nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), lithium-nickel-manganese-cobalt composite oxide (LNMCO), etc. Materials can be used.

As the material of the positive electrode active material, various materials that can release and insert ions such as lithium or magnesium can be used.

Moreover, as the material contained in the positive electrode active material layer 120, for example, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, a sulfide solid electrolyte or an oxide solid electrolyte may be used. As the sulfide solid electrolyte, for example, a mixture of lithium sulfide (Li ₂ S) and phosphorus pentasulfide (P ₂ S ₅ ) can be used. The surface of the positive electrode active material may be coated with a solid electrolyte. Further, as a material contained in the positive electrode active material layer 120, a conductive material such as acetylene black or a binder for binding such as polyvinylidene fluoride may be used. As the conductive material and the binder, the materials mentioned above as the materials used for the negative electrode active material layer 110 may be used.

The positive electrode active material layer 120 can be produced, for example, by applying a paste-like paint obtained by kneading the material contained in the positive electrode active material layer 120 together with a solvent onto the surface of the positive electrode current collector 220 and drying it. In order to increase the density of the positive electrode active material layer 120, the positive electrode plate including the positive electrode active material layer 120 and the positive electrode current collector 220 may be pressed after drying. The thickness of the positive electrode active material layer 120 is, for example, 5 μm or more and 300 μm or less, but is not limited to this.

The solid electrolyte layer 130 is disposed between the negative electrode active material layer 110 and the positive electrode active material layer 120. The solid electrolyte layer 130 is in contact with each of the negative electrode active material layer 110 and the positive electrode active material layer 120. The solid electrolyte layer 130 is a layer containing an electrolyte material. As the electrolyte material, generally known electrolytes for batteries can be used. The thickness of the solid electrolyte layer 130 may be 5 μm or more and 300 μm or less, or may be 5 μm or more and 100 μm or less.

The solid electrolyte layer 130 may include a solid electrolyte. The battery 1000 including the power generation element 100 may be, for example, an all-solid-state battery.

As the solid electrolyte, for example, a solid electrolyte such as an inorganic solid electrolyte can be used. As the inorganic solid electrolyte, a sulfide solid electrolyte or an oxide solid electrolyte may be used. As the sulfide solid electrolyte, for example, a mixture of lithium sulfide (Li ₂ S) and phosphorus pentasulfide (P ₂ S ₅ ) can be used. The solid electrolyte layer 130 may contain a binder for binding such as polyvinylidene fluoride, in addition to the electrolyte material.

The negative electrode current collector 210 and the positive electrode current collector 220 are members having conductivity. The negative electrode current collector 210 and the positive electrode current collector 220 may each be, for example, a conductive thin film. As a material forming the negative electrode current collector 210 and the positive electrode current collector 220, for example, a metal such as stainless steel (SUS), aluminum (Al), or copper (Cu) can be used.

The negative electrode current collector 210 is arranged in contact with the negative electrode active material layer 110. As the negative electrode current collector, for example, metal foil such as SUS foil and Cu foil can be used. The thickness of the negative electrode current collector 210 is, for example, 5 μm or more and 100 μm or less, but is not limited thereto. Note that the negative electrode current collector 210 may include a current collector layer that is a layer containing a conductive material, for example, in a portion in contact with the negative electrode active material layer 110.

The positive electrode current collector 220 is arranged in contact with the positive electrode active material layer 120. As the positive electrode current collector 220, for example, a metal foil such as SUS foil or Al foil can be used. The thickness of the positive electrode current collector 220 is, for example, 5 μm or more and 100 μm or less, but is not limited thereto. The positive electrode current collector 220 may include a current collector layer that is a layer containing a conductive material, for example, in a portion in contact with the positive electrode active material layer 120.

The negative electrode active material layer 110 has unevenness due to the surface roughness of the negative electrode current collector 210 or the thickness distribution and surface roughness of the negative electrode active material layer 110. A part of the surface roughness of the negative electrode active material layer 110 may be due to the surface roughness of the negative electrode current collector 210, and a part of the surface roughness of the negative electrode current collector 210 and the negative electrode active material layer 110. It may be responsible for improving the bonding strength. Further, part of the surface roughness of the negative electrode active material layer 110 may be due to the shape of particles or aggregates contained in the negative electrode active material layer material. The thickness distribution of the negative electrode active material layer 110 may include a thickness distribution that is intentionally given in addition to a thickness variation such as coating unevenness that occurs when the negative electrode active material layer 110 is formed.

In the first embodiment, as shown in FIG. 1, since the negative electrode current collector layer 210 is in contact with the negative electrode active material layer 110, the negative electrode active material layer associated with the surface roughness, the thickness distribution, or the like. Part of the unevenness of 110 is reflected on the surface of the negative electrode current collector 210 opposite to the surface on which the negative electrode active material layer 110 is formed. Further, the interface between the solid electrolyte layer 130 and the negative electrode active material layer 110 is formed to be flat as compared with the unevenness of the interface between the negative electrode current collector 210 and the negative electrode active material layer 110. Since the interface between the solid electrolyte layer 130 and the negative electrode active material layer 110 is formed flat, the solid electrolyte layer 130 can be partially thinned, and the risk of dielectric breakdown and short circuit can be reduced.

The positive electrode active material layer 120 has unevenness due to the surface roughness of the positive electrode current collector 220 or the thickness distribution and surface roughness of the positive electrode active material layer 120. Some of the surface roughness of the positive electrode active material layer 120 may be due to the surface roughness of the positive electrode current collector 220, and some of the surface roughness of the positive electrode current collector 220 and the positive electrode active material layer 120. It may be responsible for improving the bonding strength. Further, part of the surface roughness of the positive electrode active material layer 120 may be due to the shape of particles or aggregates thereof included in the positive electrode active material layer material. The thickness distribution of the positive electrode active material layer 120 may include a thickness distribution that is intentionally given in addition to a thickness variation such as coating unevenness that occurs when the positive electrode active material layer 120 is formed.

Further, since the positive electrode current collector layer 220 is in contact with the positive electrode active material layer 120, a part of the unevenness of the positive electrode active material layer 120 due to the surface roughness, the thickness distribution, or the like is part of the positive electrode current collector 220. It is reflected on the surface opposite to the surface on which the positive electrode active material layer 120 is formed. Further, the interface between the solid electrolyte layer 130 and the positive electrode active material layer 120 is formed to be flat as compared with the unevenness of the interface between the negative electrode current collector 210 and the positive electrode active material layer 120. By forming the interface between the solid electrolyte layer 130 and the positive electrode active material layer 120 to be flat, the solid electrolyte layer 130 can be partially thinned and the risk of dielectric breakdown and short circuit can be reduced. In FIG. 1, both the interface of the negative electrode active material layer 110 on the solid electrolyte layer 130 side and the interface of the positive electrode active material layer 120 on the solid electrolyte layer 130 side are formed flat, but at least one interface is It may be formed flat.

FIG. 2 is a cross-sectional view showing a schematic configuration of a battery of a conventional example. In a battery 1100 of FIG. 2 shown as a conventional example, a positive electrode active material layer 120 and a negative electrode active material layer 110 due to surface roughness or thickness distribution. 2 is strongly reflected in the solid electrolyte layer 130, and the solid electrolyte layer 130 is partially thinned, so that the battery 1100 of FIG. 2 has a higher short circuit risk than the battery 1000 of FIG.

[Battery manufacturing method]
Next, an example of a manufacturing method for forming the battery according to the first embodiment will be described. The battery manufacturing method in the first embodiment is not limited to the following manufacturing method.

FIG. 3 is a diagram schematically showing an example of a part of the process for forming the battery according to the first embodiment.

FIG. 3 illustrates a process of pressing the negative electrode plate 310 including the negative electrode current collector 210 and the negative electrode active material layer 110 formed on the negative electrode current collector 210. The battery manufacturing method in the first embodiment includes a pressing step of pressing negative electrode plate 310 including negative electrode current collector 210 and negative electrode active material layer 110 formed on one surface of negative electrode current collector 210. In the pressing step, the lower compression pin 520 and the flexible member sheet 600 that are members that press the negative electrode collector 310 side of the negative electrode plate 310 are the upper compression that is the member that presses the negative electrode active material layer 110 side of the negative electrode plate 310. It is made of a softer material than the pin 510. The negative electrode plate 310 is an example of an electrode plate, the lower compression pin 520 and the flexible member sheet 600 are an example of a pressing member for an electrode current collector, and the upper compression pin 510 is an example of a pressing member for an electrode active material layer. Is. Further, in the method for manufacturing the battery according to Embodiment 1, the negative electrode active material layer 110 formed on one surface of the negative electrode current collector 210 and the positive electrode active material layer 120 formed on one surface of the positive electrode current collector 220 are This is a method for manufacturing a battery, which is formed by joining the negative electrode active material layer 110 and the positive electrode active material layer 120 with the solid electrolyte layer 130 interposed therebetween.

FIG. 3A is a sectional view schematically showing the state of the negative electrode plate 310 immediately before pressing. The upper compression pin 510 and the lower compression pin 520 slide vertically and come close to each other inside the press outer frame 500, thereby compressing the negative electrode plate 310. The negative electrode plate 310 is installed inside the press outer frame 500 with the negative electrode current collector 210 facing downward. The upper compression pin 510 is a hard and smooth pressing member made of high-strength steel or the like, and the upper surface of the negative electrode active material layer 110 having irregularities is close to the upper compression pin 510. The lower compression pin 520 is a hard and smooth pressing member made of high-strength steel or the like. The lower compression pin 520 is in contact with the negative electrode current collector 210 via the flexible member sheet 600 made of a soft material such as a resin material or a rubber material.

FIG. 3B is a sectional view schematically showing the state of the negative electrode plate 310 during pressing. The upper surface of the negative electrode active material layer 110, which comes into contact with the upper compression pin 510 as the upper compression pin 510 slides, is smoothly compression-molded by the hard and smooth upper compression pin 510 being in contact. On the other hand, in the negative electrode current collector 210 facing the lower compression pin 520 via the flexible member sheet 600, the unevenness of the upper surface of the negative electrode active material layer 110 is compressed by the upper compression pin 510 which is a hard and smooth pressing member. Correspondingly, the flexible member sheet 600 made of a soft material is pushed into the side.

As a result, the negative electrode plate 310 including the negative electrode current collector 210 after the pressing and the negative electrode active material layer 110 formed on the negative electrode current collector 210 has a negative electrode as shown in (c) of FIG. While the upper surface of the active material layer 110 is relatively smooth, unevenness due to the thickness distribution of the negative electrode active material layer 110 is generated on the negative electrode current collector 210 side of the negative electrode active material layer 110.

After that, when the solid electrolyte layer 130 is formed on the negative electrode plate 310 of FIG. 3C, the upper surface of the negative electrode active material layer 110 is smooth, and thus the solid electrolyte layer 130 having less unevenness is provided as shown in FIG. The negative electrode plate 310 with the solid electrolyte layer 130 can be formed.

FIG. 5 is a diagram schematically showing an example of a part of the process for forming the battery according to the first embodiment. FIG. 5 shows a process of pressing the positive electrode plate 320 including the positive electrode current collector 220 and the positive electrode active material layer 120 formed on the positive electrode current collector 220.

FIG. 5A is a sectional view schematically showing the state of the positive electrode plate 320 immediately before pressing. The upper compression pin 510 and the lower compression pin 520 slide vertically and come close to each other inside the press outer frame 500, thereby compressing the positive electrode plate 320. The positive electrode plate 320 is installed inside the press outer frame 500 with the positive electrode current collector 220 facing downward. The upper compression pin 510 is a hard and smooth pressing member made of high-strength steel or the like, and the upper surface of the positive electrode active material layer 120 having irregularities is close to the upper compression pin 510. The lower compression pin 520 is a hard and smooth pressing member made of high-strength steel or the like. The lower compression pin 520 is in contact with the positive electrode current collector 220 via the flexible member sheet 600 made of a soft material such as a resin material or a rubber material.

FIG. 5B is a sectional view schematically showing the state of the positive electrode plate 320 during pressing. The upper surface of the positive electrode active material layer 120, which comes into contact with the upper compression pin 510 as the upper compression pin 510 slides, is smoothly compression-molded by the hard and smooth upper compression pin 510. On the other hand, in the positive electrode current collector 220 facing the lower compression pin 520 via the flexible member sheet 600, the unevenness of the upper surface of the positive electrode active material layer 120 is compressed by the upper compression pin 510 which is a hard and smooth pressing member. Correspondingly, the flexible member sheet 600 made of a soft material is pushed into the side.

As a result, the positive electrode plate 320 including the positive electrode current collector 220 after pressing and the positive electrode active material layer 120 formed on the positive electrode current collector 220 has a positive electrode plate 320 as shown in FIG. While the upper surface of the active material layer 120 is relatively smooth, unevenness is generated on the positive electrode current collector 220 side of the positive electrode active material layer 120 due to the thickness distribution of the positive electrode active material layer 120.

After that, when the solid electrolyte layer 130 is formed on the positive electrode plate 320 of FIG. 5C, the upper surface of the positive electrode active material layer 120 is smooth, and thus the solid electrolyte layer 130 having less unevenness is provided as shown in FIG. The positive electrode plate 320 with the solid electrolyte layer 130 can be formed.

A negative electrode plate 310 having a solid electrolyte layer 130 with unevenness and a small thickness distribution as shown in FIG. 4 and a positive electrode plate 320 having solid electrolyte layer 130 with a small unevenness and a thickness distribution as shown in FIG. Is used as a member constituting the battery 1000 shown as an example in FIG. By bonding the negative electrode plate 310 on which the solid electrolyte layer 130 having the unevenness and the small thickness distribution is formed and the positive electrode plate 320 on which the solid electrolyte layer 130 having the unevenness and the small thickness distribution is formed so as to sandwich the solid electrolyte layer 130, the solid It is possible to obtain a battery in which the electrolyte layer 130 is prevented from becoming partially thin and the risk of dielectric breakdown or short circuit is reduced.

FIG. 7 is a diagram schematically showing another example of a part of the process for forming the battery in the first embodiment. FIG. 7 shows a process of roll-pressing the negative electrode plate 310. The negative electrode plate 310 in which the negative electrode active material layer is formed on the negative electrode current collector is unwound from the negative electrode plate unwinding roll 410, and the negative electrode active material is rolled. After being roll-pressed between the layer side press roller 560 and the negative electrode current collector side press roller 570, the negative electrode plate winding roll 430 is wound. The negative electrode plate 310 is unrolled and wound such that the negative electrode active material layer is on the negative electrode active material layer side press roller 560 side and the negative electrode current collector is on the negative electrode current collector side press roller 570 side. The negative electrode active material layer side press roller 560 and the negative electrode current collector side press roller 570 are hard and smooth rollers made of high strength steel or the like.

In the roll press, a smooth and hard negative electrode active material layer side press roller 560 is used on the negative electrode active material layer side, and a resin material or the like is provided between the negative electrode current collector and the negative electrode current collector side press roller 570. The long sheet-shaped flexible member sheet 600 is supplied from the auxiliary material unwinding roll 450, adjusted in position by the auxiliary roller 700, and pressed together with the negative electrode plate 310, so that the negative electrode plate 310 is moved to the negative electrode plate winding roll 430. The flexible member sheet 600 is wound around the auxiliary material winding roll 460. The flexible member sheet 600 can be repeatedly used and can be made to be a circulating system instead of a winding system. Alternatively, the flexible member sheet 600 may be installed on the peripheral surface of the negative electrode current collector side press roller 570. The negative electrode active material layer surface is smoothed by roll press compression using a hard and smooth negative electrode active material layer side press roller 560 according to the same principle as the process shown in FIG. By roll press compression using the current collector side press roller 570, irregularities corresponding to the thickness distribution of the negative electrode active material layer are formed on the negative electrode current collector. After the step shown in FIG. 7, the solid electrolyte layer 130 is formed on the negative electrode active material layer 110, and is used as a member constituting the battery 1000 shown as an example in FIG. The process shown in FIG. 7 can be similarly applied to the positive electrode plate 320 in which the positive electrode active material layer is formed on the positive electrode current collector.

FIG. 8 is a diagram schematically showing an example of a part of another step for forming the battery according to the first embodiment. FIG. 8 shows a process in which a battery 1200 including the positive electrode current collector 220, the positive electrode active material layer 120, the negative electrode current collector 210, the negative electrode active material layer 110, and the solid electrolyte layer 130 is pressed. Another method of manufacturing the battery according to the first embodiment has a structure in which a negative electrode current collector 210, a negative electrode active material layer 110, a solid electrolyte layer 130, a positive electrode active material layer 120, and a positive electrode current collector 220 are laminated in this order. It includes a pressing step of pressing the body. In the pressing step, a surface portion on the negative electrode current collector side of the lower compression pin 520, which is a member for pressing the negative electrode current collector 210 side of the structure, and a member for pressing the positive electrode current collector side of the structure. At least one of the surface portions of the upper compression pin 510 on the positive electrode collector side is made of a resin material or a rubber material. In the pressing step, the negative electrode active material layer 110 formed on one surface of the negative electrode current collector 210 and the positive electrode active material layer 120 formed on one surface of the positive electrode current collector 220 are connected to the negative electrode active material layer 110 and the positive electrode. Bonding is performed with the active material layer 120 via the solid electrolyte layer 130.

FIG. 8A is a sectional view schematically showing a state immediately before pressing. As shown in FIG. 8A, the positive electrode active material layer 120 formed on the positive electrode current collector 220 and the negative electrode active material layer 110 formed on the negative electrode current collector 210 form the solid electrolyte layer 130. Is joined and pressed through. The solid electrolyte layer 130 may be formed on one of the positive electrode active material layer 120 and the negative electrode active material layer 110, may be formed on both, or may be supplied in an independent sheet form.

The upper compression pin 510 and the lower compression pin 520 slide up and down inside the press outer frame 500 and come close to each other, whereby the negative electrode plate 310 and the positive electrode plate 320 are joined. The lower compression pin 520 is a hard and smooth pressing member made of high-strength steel or the like. The lower compression pin 520 is in contact with the negative electrode current collector 210 via a flexible member sheet 600 made of a soft material such as a resin material or a rubber material. Similarly, the upper compression pin 510 is a hard and smooth pressing member made of high-strength steel or the like, and the upper compression pin 510 is provided with a positive electrode current collector through a flexible member sheet 600 made of a resin material, a rubber material, or the like. It is in contact with the body 220.

FIG. 8B is a sectional view schematically showing the state of the negative electrode plate 310 during pressing. As shown in FIG. 8B, the upper compression pin 510 and the lower compression pin 520 approach each other and compress the battery 1200. By the compression, the surface of the positive electrode active material layer 120 in contact with the solid electrolyte layer 130 becomes smooth, and irregularities corresponding to the thickness distribution of the positive electrode active material layer 120 are formed on the positive electrode current collector 220. At the same time, the surface of the negative electrode active material layer 110 that is in contact with the solid electrolyte layer 130 becomes smooth, and irregularities corresponding to the thickness distribution of the negative electrode active material layer 110 are formed on the negative electrode current collector 210. As a result, a relatively parallel and smooth solid electrolyte layer 130 is formed between the positive electrode active material layer 120 and the negative electrode active material layer 110, and a battery with high battery capacity and high reliability can be realized.

FIG. 9 is a diagram schematically showing another example of a part of the process for forming the battery in the first embodiment.

FIG. 9 shows a process of roll-pressing the negative electrode plate 311 and the positive electrode plate 321, and includes a negative electrode active material layer (not shown) and a solid electrolyte layer (not shown) on a negative electrode current collector (not shown). ) Are formed in this order, and at the same time when the negative electrode plate 311 is unwound from the negative electrode plate unwinding roll 410, the positive electrode active material layer (not shown) and the solid electrolyte layer are formed on the positive electrode current collector (not shown). (Not shown) in this order, the positive electrode plate 321 is unwound from the positive electrode plate unwinding roll 420, and the negative electrode plate 311 and the positive electrode plate 321 are pressed by the positive electrode current collector side press roller 590 and the negative electrode current collector side press. Bonding roll pressing is performed between the roller 570 and the roller 570. The negative electrode plate 311 is unwound and wound such that the negative electrode current collector 210 is on the negative electrode current collector side press roller 570 side. The positive electrode plate 321 is unwound and wound so that the positive electrode current collector 220 is on the positive electrode current collector side press roller 590 side. The positive electrode current collector side press roller 590 and the negative electrode current collector side press roller 570 are hard and smooth rollers made of high strength steel or the like.

In the roll press, a long sheet-shaped positive electrode side flexible member sheet 620 made of a resin material or the like is supplied from the auxiliary material unwinding roll 450 between the positive electrode current collector 220 and the positive electrode current collector side press roller 590. Then, between the negative electrode current collector 210 and the negative electrode current collector side press roller 570, a long sheet-shaped negative electrode side flexible member sheet 610 made of a resin material or the like is supplied from the auxiliary material unwinding roll 450. .. Thereby, the positive electrode side flexible member sheet 620, the positive electrode plate 321, the negative electrode plate 311, and the negative electrode side flexible member sheet 610 are pressed together in the state laminated|stacked in this order. Then, the positive electrode side flexible member sheet 620 is wound around the positive electrode side auxiliary material winding roll 462, and the negative electrode side flexible member sheet 610 is wound around the negative electrode side auxiliary material winding roll 461 so that they face each other via the solid electrolyte layer. The negative electrode plate 310 and the positive electrode plate 320 joined to each other are drawn out by the drawing roller 800, conveyed by the auxiliary roller 700, and appropriately cut. The flexible member sheet 600 may be used repeatedly and may be of a circulating type instead of a winding type. Alternatively, a flexible member may be installed on the peripheral surfaces of the negative electrode current collector side press roller 570 and the positive electrode current collector side press roller 590. By roll press compression using the negative electrode side flexible member sheet 610 and the positive electrode side flexible member sheet 620, the solid electrolyte layer becomes smooth, while the unevenness according to the thickness distribution of the negative electrode active material layer is formed on the negative electrode current collector. And the unevenness corresponding to the thickness distribution of the positive electrode active material layer is formed on the positive electrode current collector. By the process shown in FIG. 9, even if the solid electrolyte layer is thin on average, the risk of short circuit is small because the thickness distribution is small, and it is possible to obtain a battery with high battery capacity and high reliability.

FIG. 10 is a diagram schematically showing a part of the process for forming the battery according to the first embodiment. In FIG. 10, the upper compression pin 510 and the lower compression pin 520 slide vertically in the press outer frame 500 and come close to each other, so that a plurality of unit cells 1300, 1400, 1500, 1600 and 1700 are simultaneously laminated and pressed. The state in which the laminated battery 2000 is formed is shown. Another method for manufacturing a battery according to the first embodiment is that a plurality of single battery cells 1300, 1400, via a flexible member sheet 601 arranged between the plurality of single battery cells 1300, 1400, 1500, 1600 and 1700. It includes a pressing step of pressing a laminated battery 2000 in which 1500, 1600 and 1700 are laminated. In the pressing step, the surface portions of the upper compression pin 510 and the lower compression pin 520 are the flexible member sheet 601, and the plurality of single battery cells 1300, 1400, 1500, 1600, and 1700 are the negative electrode current collector 210, respectively. The negative electrode active material layer 110 formed on one surface and the positive electrode active material layer 120 formed on one surface of the positive electrode current collector 220 are solids disposed between the negative electrode active material layer 110 and the positive electrode active material layer 120. It is bonded via the electrolyte layer 130. The laminated battery 2000 is an example of a battery, the single battery cells 1300, 1400, 1500, 1600 and 1700 are an example of battery cells, and the upper compression pin 510 and the lower compression pin 520 are an example of a press member. The flexible member sheet 601 is an example of a resin material or a rubber material.

Each unit cell before reaching the stacking press shown in FIG. 10 may be unbonded, and the positive electrode active material layer 120 and the negative electrode active material layer 110 are bonded to each other through the solid electrolyte layer 130 by a light pressing. You may have. The stacked battery 2000 is a battery in which a plurality of single battery cells 1300, 1400, 1500, 1600 and 1700 are stacked. A flexible member sheet 601 is arranged between each of the plurality of unit cells 1300, 1400, 1500, 1600 and 1700. Each of the plurality of single battery cells 1300, 1400, 1500, 1600 and 1700 is a battery having the same configuration as the battery 1000 shown in FIG. 1, for example. The flexible member sheet 601 having a low electric resistance or an insulating material is appropriately selected according to the purpose of the laminated battery configuration. Instead of the flexible member sheet 601, a flexible layer may be applied on the positive electrode current collector 220 or the negative electrode current collector 210, or may be formed by another method. By the laminating press, the thickness distributions of the positive electrode active material layer 120 and the negative electrode active material layer 110 are absorbed by the flexible member sheet 601 or the flexible layer, and a plurality of single battery cells are bonded via the flexible member sheet 601 or the flexible layer. ..

The plurality of single battery cells 1300, 1400, 1500, 1600 and 1700 respectively include a negative electrode active material layer 110 formed on one surface of a negative electrode current collector 210 and a positive electrode active material formed on one surface of a positive electrode current collector 220. The layer 120 and the negative electrode active material layer 110 are bonded to each other via the solid electrolyte layer 130 disposed between the positive electrode active material layer 120, and the solid electrolyte layer 130 side of the negative electrode active material layer 110 is formed. The surface roughness is smaller than the surface of the negative electrode active material layer 110 on the negative electrode current collector 210 side. Further, the surface of the positive electrode active material layer 120 on the solid electrolyte layer 130 side has a smaller surface roughness than the surface of the positive electrode active material layer 120 on the positive electrode current collector 220 side. The plurality of single battery cells 1300, 1400, 1500, 1600, and 1700 are stacked via the flexible member sheet 601 arranged between the respective single battery cells.

As a result, both the interface between the solid electrolyte layer 130 and the positive electrode active material layer 120 and the interface between the solid electrolyte layer 130 and the negative electrode active material layer 110 are formed smoothly, and a plurality of batteries having high battery capacity and high reliability are formed. Can be realized. A plurality of unit cells in a stacked state may be used as a series or parallel stacked battery in the stacked state, or may be released from the stacked state and used as a single cell. Switching between the series and parallel of the stacked batteries can be easily realized by reversing and stacking some batteries upside down.

(Other embodiments)
Although the battery according to one or more aspects has been described above based on the embodiments, the present disclosure is not limited to these embodiments. Unless deviating from the gist of the present disclosure, those obtained by making various modifications that a person skilled in the art can think of and the configurations constructed by combining the components of the different embodiments are also included within the scope of the present disclosure. Be done.

Further, each of the above-described embodiments can be variously modified, replaced, added, omitted, or the like within the scope of claims or the scope equivalent thereto.

For example, in the above-described embodiment, the positive electrode current collector, the positive electrode active material layer, the negative electrode current collector, the negative electrode active material layer, and the solid electrolyte layer are all laminated in the same width, but the present invention is not limited to this, and the positive electrode current collector is not limited thereto. The width of the positive electrode active material layer, the negative electrode active material layer and the solid electrolyte layer is narrower than that of the body and the negative electrode current collector, and the positive electrode active material layer, the negative electrode active material layer and the solid electrolyte layer in the positive electrode current collector and the negative electrode current collector are You may form a sealing member in the area|region which is not formed, and may seal a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer. In addition, the width of the negative electrode active material layer may be larger than that of the positive electrode active material layer. Further, the solid electrolyte layer may be formed so as to cover the side surfaces of the negative electrode active material layer and the positive electrode active material layer.

The battery of the present disclosure can be used as a battery for electronic devices, electric appliance devices, electric vehicles, and the like.

100 power generation element 110 negative electrode active material layer 120 positive electrode active material layer 130 solid electrolyte layer 210 negative electrode current collector 220 positive electrode current collectors 310, 311 negative electrode plates 320, 321 positive electrode plate 410 negative electrode plate unwinding roll 420 positive electrode plate unwinding roll 430 Negative electrode plate winding roll 450 Auxiliary material unwinding roll 460 Auxiliary material winding roll 461 Negative electrode side auxiliary material winding roll 462 Positive electrode side auxiliary material winding roll 500 Press outer frame 510 Upper compression pin 520 Lower compression pin 560 Negative electrode active material Layer side press roller 570 Negative electrode current collector side press roller 590 Positive electrode current collector side press roller 600, 601 Flexible member sheet 610 Negative side flexible member sheet 620 Positive electrode side flexible member sheet 700 Auxiliary roller 800 Drawer roller 1000, 1100, 1200 Battery 1300, 1400, 1500, 1600, 1700 Single battery cell 2000 Laminated battery

Claims (11)

An electrode active material layer formed on one surface of the electrode current collector and a counter electrode active material layer formed on one surface of the counter current collector are arranged between the electrode active material layer and the counter electrode active material layer. A battery formed by joining via a solid electrolyte layer,
The surface of the electrode active material layer on the side of the solid electrolyte layer is smaller in surface roughness than the surface of the electrode active material layer on the side of the electrode current collector,
battery. The surface shape of the electrode active material layer on the side of the electrode current collector is the same as the surface shape of the electrode current collector on the side opposite to the electrode active material layer,
The battery according to claim 1. The surface of the counter electrode active material layer on the solid electrolyte layer side is smaller in surface roughness than the surface of the counter electrode active material layer on the counter electrode current collector side,
The battery according to claim 1 or 2. The surface shape of the counter electrode active material layer on the counter electrode current collector side and the surface shape of the counter electrode current collector opposite to the counter electrode active material layer are the same,
The battery according to claim 3. A battery in which a plurality of battery cells are stacked,
The plurality of battery cells,
An electrode active material layer formed on one surface of the electrode current collector and a counter electrode active material layer formed on one surface of the counter current collector are arranged between the electrode active material layer and the counter electrode active material layer. It is formed by joining through the solid electrolyte layer,
The surface of the electrode active material layer on the side of the solid electrolyte layer is smaller in surface roughness than the surface of the electrode active material layer on the side of the electrode current collector,
battery. The surface of the counter electrode active material layer on the solid electrolyte layer side is smaller in surface roughness than the surface of the counter electrode active material layer on the counter electrode current collector side,
The battery according to claim 5. The plurality of battery cells are laminated via a resin-based material or a rubber-based material arranged between the battery cells,
The battery according to claim 5 or 6. Including a pressing step of pressing an electrode plate including an electrode current collector and an electrode active material layer formed on one surface of the electrode current collector,
In the pressing step, an electrode current collector pressing member that is a member that presses the electrode current collector side of the electrode plate is for an electrode active material layer that is a member that presses the electrode active material layer side of the electrode plate. Made of a softer material than the press member,
Battery manufacturing method. The electrode current collector-side surface of the electrode current collector press member is made of a resin material or a rubber material,
The method for manufacturing the battery according to claim 8. An electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer and a counter electrode current collector include a pressing step of pressing a structure laminated in this order,
In the pressing step, the electrode current collector side surface portion of the electrode current collector pressing member that is a member that presses the electrode current collector side of the structure, and the counter electrode current collector side of the structure is pressed. At least one of the surface portion on the counter current collector side of the counter current collector press member that is a member to be formed is made of a resin material or a rubber material,
Battery manufacturing method. Via a resin-based material or rubber-based material disposed between the plurality of battery cells, including a pressing step of pressing the battery in which the plurality of battery cells are stacked,
In the pressing step, the surface portion of the pressed member is a resin material or a rubber material,
The plurality of battery cells,
An electrode active material layer formed on one surface of the electrode current collector, and a counter electrode active material layer formed on one surface of the counter current collector, a solid disposed between the electrode active material layer and the counter electrode active material layer Bonded through an electrolyte layer,
Battery manufacturing method.

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