Batteries and their manufacturing methods

Abstract

The battery comprises: a power generation element including a positive electrode layer, a negative electrode layer, and an electrolyte layer located between the positive electrode layer and the negative electrode layer; an inner terminal electrode electrically connected to the power generation element; and a laminated film housing the power generation element and the inner terminal electrode, the laminated film comprising: a metal layer; an inner resin layer located on the side of the power generation element relative to the metal layer; and an outer resin layer located on the opposite side of the inner resin layer relative to the metal layer, the inner resin layer having an inner opening that exposes the metal layer, the inner terminal electrode being electrically connected to the metal layer through the inner opening, and in the region where the inner terminal electrode contacts the metal layer, the inner terminal electrode and the metal layer each having a concave and convex surface, the concave and convex surface of the inner terminal electrode engaging with the concave and convex surface of the metal layer.

Description

Technical Field

[0001] This disclosure relates to batteries and methods for manufacturing them. Background Technology

[0002] In existing batteries, when the power generation element is encapsulated in an outer casing such as a laminate, there is a problem of positional displacement of the power generation element relative to the outer casing. To suppress this positional displacement, batteries using adhesive layers are known (for example, see Patent Document 1).

[0003] Patent Document 1 discloses a battery comprising: an all-solid-state battery stack having at least one unit all-solid-state battery; a positive terminal and a negative terminal respectively connected to a positive current collector layer and a negative current collector layer; and an outer casing bottom member constituting an outer casing into which the all-solid-state battery stack is encapsulated. Furthermore, in this battery, an adhesive layer is present at least at one location between the positive or negative current collector layer of the all-solid-state battery stack and the outer casing bottom member, and between the positive and negative terminals and the outer casing bottom member.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-164892 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In existing batteries, it is difficult to easily achieve the relative positioning of the power generation element and the laminate, and it is also difficult to improve reliability. Therefore, the object of this disclosure is to provide a battery that enables easy relative positioning of the power generation element and the laminate and has high reliability, as well as a method for manufacturing the same.

[0009] Problem-solving methods

[0010] One aspect of the battery disclosed herein includes: a power generation element comprising a positive electrode layer, a negative electrode layer, and an electrolyte layer located between the positive electrode layer and the negative electrode layer; an inner terminal electrode electrically connected to the power generation element; and a laminated film housing the power generation element and the inner terminal electrode, the laminated film comprising: a metal layer; an inner resin layer located on the side of the power generation element relative to the metal layer; and an outer resin layer located on the opposite side of the inner resin layer relative to the metal layer, wherein the inner resin layer has an inner opening exposing the metal layer, the inner terminal electrode being electrically connected to the metal layer through the inner opening, and in the region where the inner terminal electrode contacts the metal layer, the inner terminal electrode and the metal layer each have a concave and convex surface, the concave and convex surface of the inner terminal electrode engaging with the concave and convex surface of the metal layer.

[0011] One method of manufacturing a battery disclosed herein is a method for manufacturing a battery comprising: a power generation element including a positive electrode layer, a negative electrode layer, and an electrolyte layer located between the positive electrode layer and the negative electrode layer; an inner terminal electrode; and a laminated film housing the power generation element and the inner terminal electrode. The manufacturing method includes: a preparation step of preparing a laminated film having a metal layer and an inner resin layer located on the side of the power generation element relative to the metal layer, and having an inner opening in the inner resin layer exposing the metal layer; a placement step of placing a structure in the inner opening; and a pressing step of pressing the inner terminal electrode electrically connected to the power generation element in the inner opening of the inner opening where the structure has been placed in the placement step, so that the inner terminal electrode is electrically connected to the metal layer.

[0012] The effects of the invention

[0013] According to this disclosure, a battery and its manufacturing method can be provided that enable easy and reliable relative positioning of the power generation element and the laminate. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view showing the general structure of the battery according to Embodiment 1.

[0015] Figure 2A yes Figure 1 An enlarged cross-sectional view of the perimeter of the structure in Region II.

[0016] Figure 2B yes Figure 1 The magnified anatomical view of the periphery of the structure in Region II.

[0017] Figure 3 It is a top view that clearly shows the positional relationship of the inner terminal electrode, the inner opening, and the structure in Embodiment 1.

[0018] Figure 4A This is a cross-sectional view showing one step of the battery manufacturing method according to Embodiment 1.

[0019] Figure 4B This is a cross-sectional view showing one step of the battery manufacturing method according to Embodiment 1.

[0020] Figure 4C This is a cross-sectional view showing one step of the battery manufacturing method according to Embodiment 1.

[0021] Figure 5 This is a top view showing the positional relationship of the inner terminal electrode, the inner opening, and the structure in a modified example of Embodiment 1.

[0022] Figure 6 This is an enlarged cross-sectional view of the structure surrounding the battery in a modified embodiment 1.

[0023] Figure 7 This is a cross-sectional view showing the schematic structure of the battery in Embodiment 2.

[0024] Figure 8 This is a cross-sectional view showing the general structure of the battery in Embodiment 3.

[0025] Figure 9 This is a cross-sectional view showing the schematic structure of the battery in Embodiment 4. Detailed Implementation

[0026] (To obtain an insight into one way of disclosing this information)

[0027] The inventors have discovered that, in batteries, particularly all-solid-state batteries, the following problems arise when the power generation element is encapsulated within a laminate.

[0028] In existing structures, during the sealing process, the evaporation of volatile substances from the adhesive in the bonding layer can potentially degrade the performance of the power generation element. Furthermore, there is a problem of the adhesive shrinking as it cures, causing deformation within the power generation element due to the resulting stress. This deformation can lead to reduced performance, breakage, or misalignment of the power generation element due to detachment from the bonding layer, thus decreasing the battery's reliability. Consequently, high-precision positioning of the power generation element towards the bonding layer is required, making the process excessively complex.

[0029] The purpose of this disclosure is to provide a battery and a method for manufacturing the same, which allows for easy and reliable relative positioning of the power generation element and the laminate.

[0030] A summary of one aspect of this disclosure is as follows.

[0031] One aspect of the battery disclosed herein includes: a power generation element comprising a positive electrode layer, a negative electrode layer, and an electrolyte layer located between the positive electrode layer and the negative electrode layer; an inner terminal electrode electrically connected to the power generation element; and a laminated film housing the power generation element and the inner terminal electrode, the laminated film comprising: a metal layer; an inner resin layer located on the side of the power generation element relative to the metal layer; and an outer resin layer located on the opposite side of the inner resin layer relative to the metal layer, wherein an inner opening is provided in the inner resin layer to expose the metal layer, the inner terminal electrode being electrically connected to the metal layer through the inner opening, and in the region where the inner terminal electrode contacts the metal layer, the inner terminal electrode and the metal layer each have a concave and convex surface, the concave and convex surface of the inner terminal electrode engaging with the concave and convex surface of the metal layer.

[0032] Therefore, the power generation element can be easily positioned relative to the laminated film using the uneven surfaces of the inner terminal electrode and the metal layer. Specifically, the power generation element can be positioned by the engagement of the uneven surfaces of the inner terminal electrode and the metal layer. Furthermore, when the power generation element is housed in the laminated film during the battery manufacturing process, the engagement of the uneven surfaces of the inner terminal electrode and the metal layer can suppress positional displacement of the power generation element.

[0033] Furthermore, since the power generation element can be positioned without the use of adhesives, the volatilization of volatile substances in the adhesive can be suppressed during the sealing process. Therefore, performance degradation of the power generation element due to volatile substances can be suppressed. Additionally, since adhesives can be eliminated, deformation of the power generation element due to adhesive curing can also be suppressed.

[0034] Thus, the battery based on this method can easily achieve relative positioning of the power generation element and the laminate, and can achieve a battery with high reliability.

[0035] Alternatively, for example, the metal layer may have a metal layer body and a structure, wherein the protrusion of the uneven surface of the metal layer is part of the structure.

[0036] Therefore, the power generation element can be easily positioned relative to the laminated film using a structure. Specifically, the power generation element can be positioned by embedding the structure in the metal layer body and the inner terminal electrode. Furthermore, during the battery manufacturing process, when housing the power generation element in the laminated film, embedding the structure in the metal layer body and the inner terminal electrode can suppress positional displacement of the power generation element.

[0037] Furthermore, since the power generation element can be positioned without the use of adhesives, the volatilization of volatile substances in the adhesive can be suppressed during the sealing process. Therefore, performance degradation of the power generation element due to volatile substances can be suppressed. Additionally, since adhesives can be eliminated, deformation of the power generation element due to adhesive curing can also be suppressed.

[0038] Thus, the battery based on this method can easily achieve relative positioning of the power generation element and the laminate, and can achieve a battery with high reliability.

[0039] Alternatively, for example, the structure may be electrically conductive.

[0040] This improves the conductivity from the power generation element through the inner terminal electrode to the metal layer, thereby further enhancing the reliability of the battery.

[0041] Alternatively, for example, the structure may be made of metal.

[0042] This makes it easy to improve the conductivity from the power generation element through the inner terminal electrode to the metal layer, thereby further improving the reliability of the battery.

[0043] Alternatively, for example, the structure could be a spherical particle.

[0044] Therefore, during the battery manufacturing process, the contact area between the inner terminal electrodes and the metal layer body and the structure can be reduced, thus applying stronger pressure to the contact areas of the inner terminal electrodes and the metal layer body. Consequently, the structure can be easily embedded within the metal layer body and the inner terminal electrodes, suppressing positional misalignment of the power generation element. This further improves battery reliability.

[0045] Alternatively, for example, the inner terminal electrode may be in contact with the side and main surface of the power generation element.

[0046] Therefore, the inner terminal electrodes can be supported by multiple surfaces of the power generation element. This further suppresses positional misalignment of the power generation element during battery manufacturing, thereby further improving battery reliability.

[0047] Alternatively, for example, an outer opening may be provided in the outer resin layer to expose the metal layer.

[0048] This allows current to be extracted from the power generation element through an external opening in the metal layer. Therefore, it increases the design flexibility for extracting current from the battery.

[0049] Alternatively, for example, the battery of one embodiment of this disclosure may also include an outer terminal electrode electrically connected to the metal layer at the outer opening.

[0050] Therefore, the outer terminal electrode can draw current from the outer opening. This increases the design flexibility, such as the arrangement of the outer terminal electrode.

[0051] Alternatively, for example, the thickness of the metal layer at the inner opening may be greater than the thickness of the metal layer in the area where the metal layer is not exposed.

[0052] This allows for an increase in the size of the protrusions on the uneven surface, further suppressing positional misalignment of the power generation components during battery manufacturing. Furthermore, at the points where the protrusions contact the metal layer, metal layer breakage can be prevented. Therefore, battery reliability can be further improved. In addition, since the thickness of all metal layers in the laminate is not increased, the weight of the laminate is less likely to increase. Therefore, the battery's gravimetric energy density is increased. Moreover, since the laminate can maintain flexibility, it is possible to increase battery productivity and reduce costs.

[0053] Alternatively, for example, the electrolyte layer may be a solid electrolyte layer containing a solid electrolyte with lithium-ion conductivity.

[0054] Therefore, in batteries containing solid electrolytes with lithium-ion conductivity, the relative positioning of the power generation element and the laminate can be easily achieved, and reliability can be improved.

[0055] Additionally, one method of manufacturing a battery according to this disclosure is a method for manufacturing a battery comprising: a power generation element including a positive electrode layer, a negative electrode layer, and an electrolyte layer located between the positive electrode layer and the negative electrode layer; an inner terminal electrode; and a laminated film housing the power generation element and the inner terminal electrode. The manufacturing method includes: a preparation step of preparing the laminated film having a metal layer and an inner resin layer located on the side of the power generation element relative to the metal layer, and providing an inner opening in the inner resin layer that exposes the metal layer; a placement step of placing a structure in the inner opening; and a pressing step of pressing the inner terminal electrode electrically connected to the power generation element in the inner opening of the inner opening where the structure has been placed in the placement step, so that the inner terminal electrode is electrically connected to the metal layer.

[0056] Therefore, the power generation element can be positioned by embedding the structure within the metal layer body and the inner terminal electrode. Furthermore, during the battery manufacturing process, when housing the power generation element within the laminate, embedding the structure within the metal layer body and the inner terminal electrode can suppress positional displacement of the power generation element.

[0057] Furthermore, since the power generation element can be positioned without the use of adhesives, the volatilization of volatile substances in the adhesive can be suppressed during the sealing process. Therefore, performance degradation of the power generation element due to volatile substances can be suppressed. Additionally, since adhesives can be eliminated, deformation of the power generation element due to adhesive curing can also be suppressed.

[0058] In this way, the relative positioning of the power generation element and the laminated film can be easily achieved, and highly reliable batteries can be manufactured.

[0059] The embodiments will now be described with reference to the accompanying drawings.

[0060] Furthermore, the embodiments described below are general or specific examples. The numerical values, shapes, materials, constituent elements, arrangement and connection methods of constituent elements, manufacturing processes, and order of manufacturing processes shown in the following embodiments are examples and are not intended to limit this disclosure. In addition, constituent elements in the following embodiments that are not described in the independent claims are described as arbitrary constituent elements.

[0061] Furthermore, these figures are schematic diagrams and not necessarily rigorous representations. Therefore, for example, the scales may not be consistent across different figures. Additionally, substantially identical structures are labeled with the same reference numerals across different figures, and repetitive descriptions are omitted or simplified.

[0062] Furthermore, in this specification, terms indicating the relationship between elements such as parallel or orthogonal, terms indicating the shape of elements such as rectangles or circles, and numerical ranges are not merely expressions of a strict meaning, but rather imply that they also include substantially equivalent ranges, such as expressions of a difference of a few percent.

[0063] Additionally, in this specification, "top view" means viewing the battery along its stacking direction, and the diagram in this view is a top view. "Thickness" in this specification refers to the length of the battery and each layer along its stacking direction.

[0064] In addition, in this instruction manual, the terms "inner" and "outer" in terms of "inner side" and "outer side" refer to the direction closer to the center of the battery as "inner" and the direction farther from the center of the battery as "outer".

[0065] Furthermore, in this specification, the terms "upper" and "lower" in the context of battery structure do not refer to the absolute spatial orientation of upward (vertically above) and downward (vertically below), but rather are used as terms defined by relative positional relationships based on the stacking order in a stacked structure. Additionally, the terms "upper" and "lower" can be applied not only to cases where two components are arranged spaced apart from each other and other components exist between them, but also to cases where two components are arranged closely together and in contact with each other.

[0066] Furthermore, in this specification and accompanying drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In various embodiments, the upper surface of the power generation element is parallel to the xy-plane, and the direction perpendicular to the xy-plane is defined as the z-axis direction. Additionally, in the embodiments described below, the positive z-axis direction is sometimes referred to as "upper," and the negative z-axis direction as "lower."

[0067] (Implementation Method 1)

[0068] [1. Battery Overview]

[0069] First, use Figure 1 and Figure 2A An overview of the battery in Embodiment 1 will be described. Figure 1 This is a cross-sectional view showing the schematic structure of battery 1 in this embodiment. Figure 2A yes Figure 1 An enlarged cross-sectional view of the area surrounding structure 10 in region II.

[0070] like Figure 1 As shown, the battery 1 includes a power generation element 2, inner terminal electrodes 71 and 72, and a laminated film 3.

[0071] In battery 1, the power generation element 2 and the inner terminal electrodes 71 and 72 are housed and sealed by a laminated film 3. The laminated film 3 has a first laminated film 31, a second laminated film 32, and a sealing portion 5. The first laminated film 31 has an inner resin layer 311, a metal layer 312, and an outer resin layer 313. The second laminated film 32 has an inner resin layer 321, a metal layer 322, and an outer resin layer 323. The inner resin layer 321 of the second laminated film 32 has inner openings 91 and 92 that expose the metal layer 322. Furthermore, the metal layer 322 of the second laminated film 32 has a metal layer body 11 and a structure 10.

[0072] The inner terminal electrodes 71 and 72 are in contact with each of the sides 22 and 23 and the main surface (bottom surface 21 in this case) of the power generation element 2, respectively, and draw current from the power generation element 2. The inner terminal electrodes 71 and 72 are electrically connected to the metal layer 322 at each of the inner openings 91 and 92.

[0073] like Figure 2A As shown, in this embodiment, in the region where the inner terminal electrode 71 contacts the metal layer 322, the inner terminal electrode 71 and the metal layer 322 respectively have a concave-convex surface 61 and a concave-convex surface 81. The concave-convex surface 61 of the inner terminal electrode 71 engages with the concave-convex surface 81 of the metal layer 322.

[0074] Furthermore, the protrusion of the uneven surface 81 of the metal layer 322 is part of the structure 10.

[0075] That is, the structure 10 is embedded in both the inner terminal electrode 71 and the metal layer body 11.

[0076] In addition, such as Figure 1 As shown, the same structure is also provided in the metal layer 322 of the inner terminal electrode 72 and the inner opening 92.

[0077] The function of structure 10 will be explained below. Structure 10 primarily functions in the sealing process of sealing the power generation element 2 to the laminate 3. This sealing process is performed within a depressurized space using a depressurization chamber. For more details, please refer to... Figures 4A to 4C The sealing process will be briefly described below.

[0078] In the sealing process, firstly, a second laminated membrane 32 with inner openings 91 and 92 is disposed within the pressure-reducing chamber. The inner openings 91 and 92... Figure 1 The value is set to extend along the y-axis.

[0079] Furthermore, a power generation element 2, equipped with inner terminal electrodes 71 and 72, is positioned above the second laminated film 32. At this time, a structure 10 is pre-positioned above the metal layer body 11 in each of the inner openings 91 and 92. The inner terminal electrodes 71 and 72 of the power generation element 2 are then positioned above the inner openings 91 and 92, respectively, with respect to the structure 10. By pressing the power generation element 2 and the inner terminal electrodes 71 and 72 in this state, the structure 10 is embedded in each of the inner terminal electrodes 71 and 72 and the metal layer body 11. Therefore, due to the structure 10, the power generation element 2 is less likely to move relative to the second laminated film 32; that is, the placement position of the power generation element 2 is determined. In other words, the power generation element 2 is positioned.

[0080] To enclose the power generation element 2 together with the structure 10, the first lamination 31 is configured to cover the power generation element 2. In this state, the pressure in the pressure-reducing chamber decreases, and the ends of the first lamination 31 and the second lamination 32 adhere to each other. Thus, a sealing portion 5 is formed to surround the first lamination 31 and the second lamination 32.

[0081] After bonding, if the pressure returns to normal, the first laminate 31 and the second laminate 32 are covered along the power generation element 2 due to the ambient air pressure. When the pressure returns to normal, the power generation element 2 is subjected to external forces due to the airflow in the environment when the pressure rises to normal and the deformation or movement of the laminate 3 caused by the airflow. In the absence of the structure 10, the power generation element 2 may sometimes move due to these external forces, causing a positional shift. In the battery 1 of this embodiment, the structure 10 is embedded in each of the inner terminal electrodes 71 and 72 and the metal layer body 11. Therefore, even if these external forces are applied to the power generation element 2, the movement of the power generation element 2 is restricted, and the positional shift of the power generation element 2 is suppressed.

[0082] Furthermore, since there is no adhesive part using adhesive, there will be no performance degradation of the power generation element 2 caused by volatile substances in the adhesive, no damage caused by deformation of the power generation element 2, and no peeling from the adhesive part caused by deformation of the power generation element 2.

[0083] [2. Structure]

[0084] Then, use it again. Figure 1 The specific structure of battery 1 in this embodiment will be described. For example... Figure 1 As shown, the battery 1 of this embodiment includes: a power generation element 2, which is composed of a laminate including a positive electrode layer, a negative electrode layer and a solid electrolyte layer; inner terminal electrodes 71 and 72; and a laminated film 3. The battery 1 is, for example, an all-solid-state battery.

[0085] First, the specific structure of the power generation element 2 will be explained.

[0086] The power generation element 2 includes at least one battery cell 20. In this embodiment, the power generation element 2 includes three battery cells 20. The three battery cells 20 are stacked in series. Each battery cell 20 has a structure in which a positive electrode layer, an electrolyte layer, and a negative electrode layer are stacked sequentially. Each battery cell 20 includes a first electrode layer, a second electrode layer, and a solid electrolyte layer. The first electrode layer includes a first current collector and a first active material layer. The first active material layer is located between the first current collector and the solid electrolyte layer. The second electrode layer includes a second current collector and a second active material layer. The second active material layer is located between the second current collector and the solid electrolyte layer.

[0087] The following describes an example where the first electrode layer is a positive electrode layer and the second electrode layer is a negative electrode layer. That is, the first current collector is a positive current collector, and the first active material layer is a positive active material layer. The second current collector is a negative current collector, and the second active material layer is a negative active material layer. In this embodiment, the battery cell 20 has a structure in which a positive current collector, a positive active material layer, a solid electrolyte layer, a negative active material layer, and a negative current collector are sequentially stacked.

[0088] Alternatively, the first electrode layer can be a negative electrode layer, and the second electrode layer can be a positive electrode layer. That is, the first current collector can be a negative current collector, and the first active material layer can contain negative active material. The second current collector can be a positive current collector, and the second active material layer can contain positive active material.

[0089] The top-view shapes of the first current collector, the first active material layer, the solid electrolyte layer, the second active material layer, and the second current collector are all rectangular. There are no particular limitations on the top-view shapes of the first current collector, the first active material layer, the solid electrolyte layer, the second active material layer, and the second current collector; they can be square, or shapes other than rectangles such as circles, ellipses, or polygons. That is, the battery cell 20, which has the first current collector, the first active material layer, the solid electrolyte layer, the second active material layer, and the second current collector stacked together, has the same shape as described above.

[0090] Furthermore, in this embodiment, the first current collector, the first active material layer, the solid electrolyte layer, the second active material layer, and the second current collector are all the same size and have the same outline when viewed from above, but this is not a limitation. For example, the first active material layer may be smaller than the second active material layer. The first active material layer and the second active material layer may be smaller than the solid electrolyte layer.

[0091] Known conductive materials can be used as the materials for the first and second current collectors. For example, foils, plates, or meshes made of copper, aluminum, nickel, iron, stainless steel, platinum, or gold, or alloys of two or more of them, can be used in the first and second current collectors.

[0092] The first active material layer, serving as the positive electrode active material layer, contains at least a positive electrode active material. Depending on the requirements, the first active material layer may contain at least one of a solid electrolyte, a conductive additive, and a binder (i.e., an adhesive).

[0093] As the positive electrode active material, known materials capable of encapsulating and releasing (inserting and de-inserting, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions can be used. When the positive electrode active material is a material capable of de-inserting and inserting lithium ions, examples include lithium cobalt oxide (LCO), lithium nickel oxide (LNO), lithium manganese oxide (LMO), lithium-manganese-nickel oxide (LMNO), lithium-manganese-cobalt oxide (LMCO), lithium-nickel-cobalt oxide (LNCO), or lithium-nickel-manganese-cobalt oxide (LNMCO).

[0094] As a solid electrolyte, known materials such as lithium-ion conductors, sodium-ion conductors, or magnesium-ion conductors can be used. As a solid electrolyte, either inorganic solid electrolytes or polymeric solid electrolytes (including gel-like solid electrolytes) can be used. For example, sulfide solid electrolytes or oxide solid electrolytes can be used as inorganic solid electrolytes.

[0095] As a sulfide solid electrolyte, when the material is capable of conducting lithium ions, a composite consisting of lithium sulfide (Li₂S) and phosphorus pentasulfide (P₂S₅) can be used, for example. Alternatively, sulfides such as Li₂S-SiS₂, Li₂S-B₂S₃, or Li₂S-GeS₂ can also be used as sulfide solid electrolytes. Alternatively, sulfides containing at least one of Li₃N, LiCl, LiBr, Li₃PO₄, and Li₄SiO₄ as additives can also be used as sulfide solid electrolytes.

[0096] As an oxide solid electrolyte, when the material is capable of conducting lithium ions, for example, Li7La3Zr2O is used. 12 (LLZ), Li 1.3 Al 0.3 Ti 1.7 (PO4)3(LATP) or (La,Li)TiO3(LLTO), etc.

[0097] As conductive additives, conductive materials such as acetylene black, carbon black, graphite, or carbon fiber are used. Additionally, as adhesives, adhesives such as polyvinylidene fluoride are used.

[0098] The second active material layer, serving as the negative electrode active material layer, contains at least a negative electrode active material. Depending on the requirements, the second active material layer may contain at least one of a solid electrolyte, a conductive additive, and a binder, similar to the positive electrode active material layer.

[0099] As the negative electrode active material, known materials capable of encapsulating and releasing (inserting and desorbing, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions can be used. When the negative electrode active material is a material capable of desorbing and inserting lithium ions, examples include carbon materials such as natural graphite, artificial graphite, graphite carbon fibers, or resin-calcined carbon, metallic lithium, lithium alloys, or oxides of lithium and transition metal elements.

[0100] The solid electrolyte layer contains at least a solid electrolyte. The solid electrolyte layer may contain a binder as needed. The solid electrolyte layer may also contain a solid electrolyte with lithium-ion conductivity. The solid electrolyte and binder described above can be used as the solid electrolyte and binder contained in the solid electrolyte layer.

[0101] Furthermore, the power generation element 2 may include one or more battery cells 20. As in this embodiment, when the power generation element 2 includes multiple battery cells 20, multiple battery cells 20 can be stacked. As long as the multiple battery cells 20 function as batteries, they can be stacked in any manner, for example, in a series connection. Alternatively, the multiple battery cells 20 can also be stacked in parallel. The number of battery cells 20 included in the power generation element 2 may be two or more, without particular limitation.

[0102] Multiple battery cells 20 can be structured such that adjacent battery cells 20 share a positive current collector or a negative current collector. That is, the positive or negative electrode layer included in a single battery cell 20 may not include a current collector, but may include a positive or negative active material layer disposed on the current collector of an adjacent battery cell 20. In multiple battery cells 20, the sides 22 and 23 may be covered by a sealing member made of sealing resin or the like.

[0103] Next, the laminate 3, which is composed of the first laminate 31 and the second laminate 32, will be described.

[0104] The laminate 3 is a flexible, membrane-shaped outer casing that houses the power generation element 2 and the inner terminal electrodes 71 and 72. The laminate 3 is configured to cover the surface of the power generation element 2 to protect it from moisture, air, and other contaminants. The laminate 3 includes a first laminate 31, a second laminate 32, and a sealing portion 5, which is the portion where the first laminate 31 and the second laminate 32 are bonded together.

[0105] Furthermore, for example, after covering and housing the power generation element 2 under reduced pressure, the pressure in the external space of the laminate 3 rises to atmospheric pressure, thereby tightly bonding the laminate 3 to the power generation element 2. Therefore, in Figure 1 In the example shown, there are gaps between the laminate 3 and the sides 22 and 23 of the power generation element 2, but in reality, the gaps are small enough to be considered non-existent.

[0106] The first lamination 31 is a film covering the upper surface 24 side of the power generation element 2, and the second lamination 32 is a film covering the bottom surface 21 side of the power generation element 2. The first lamination 31 has a metal layer 312, an inner resin layer 311, and an outer resin layer 313. The second lamination 32 has a metal layer 322, an inner resin layer 321, and an outer resin layer 323.

[0107] The inner resin layers 311 and 321 are located on the 2nd side of the power generation element, respectively, opposite to the metal layers 312 and 322, and the outer resin layers 313 and 323 are located on the opposite side of the inner resin layers 311 and 321, respectively, opposite to the metal layers 312 and 322. That is, in the first lamination film 31 and the second lamination film 32, the outer resin layers 313 and 323, the metal layers 312 and 322, and the inner resin layers 311 and 321 are sequentially stacked in the direction closer to the center of the battery.

[0108] Here, inner openings 91 and 92 are provided in the inner resin layer 321 of the second lamination film 32, serving as spaces for exposing the metal layer 322. That is, the metal layer 322 is not covered by the inner resin layer 321 in the inner openings 91 and 92. Furthermore, as described later, the inner terminal electrodes 71 and 72 of the battery 1 are electrically connected to the metal layer 322 through the inner openings 91 and 92, respectively. Therefore, the inner openings 91 and 92 form a structure in which the inner resin layer 321 is removed to match the shape of the inner terminal electrodes 71 and 72.

[0109] In the region where the inner terminal electrodes 71 and 72 contact the metal layer 322, the metal layer 322 has a concave-convex surface 81. That is, the concave-convex surface 81 is the upper surface of the metal layer 322 in the inner openings 91 and 92.

[0110] Here, use Figure 2A and Figure 2B The metal layer 322 and the uneven surface 81 will be described in more detail.

[0111] Figure 2B yes Figure 1 An enlarged anatomical view of the area surrounding structure 10 in region II.

[0112] like Figure 2A and Figure 2B As shown, in this embodiment, the metal layer 322 has a metal layer body 11 and a structure 10. The structure 10 is a particle located between the metal layer body 11 and the inner terminal electrodes 71 and 72.

[0113] Structure 10 is a spherical particle. Structure 10 can also be a cuboid or a cube. The size of structure 10 is defined as the length of the longest side of the smallest cuboid that can completely contain it. The size of structure 10 can be from a few μm to tens of μm. Structure 10 is conductive, particularly made of a low-resistance metal. Specifically, structure 10 is made of, for example, stainless steel. Alternatively, structure 10 can be made of molybdenum, tungsten, etc. Structure 10 can also be made of, for example, a non-conductive resin; however, in this case, the structure 10 can be made conductive by covering its surface with a conductive material.

[0114] Thus, the structure 10 is conductive, thereby improving the conductivity from the power generation element 2 to the metal layer 322 via the inner terminal electrodes 71 and 72 (described later). For example, it can suppress the loss of conductivity between the inner terminal electrodes 71 and 72 and the metal layer 322, that is, it can suppress the performance degradation of the power generation element 2. Therefore, the reliability of the battery 1 can be further improved.

[0115] The material of structure 10 is not particularly limited. From the viewpoint of stably ensuring the electrical connection between the inner terminal electrodes 71 and 72 and the metal layer 322, it can be made of metal. This makes it easy to improve the conductivity from the power generation element 2 to the metal layer 322, and further improves the reliability of battery 1.

[0116] Furthermore, when the power generation element 2 is sealed to the laminate 3 and then returns to atmospheric pressure, an external force is generated on the power generation element 2. Therefore, the structure 10 can be made of a material with sufficient hardness, strength, and elasticity to limit the movement of the power generation element 2 caused by the external force.

[0117] Thus, when the metal layer 322 has the structure 10, the uneven surface 81 is the surface of both the metal layer body 11 and the structure 10. That is, in this embodiment, the protrusion of the uneven surface 81 is part of the structure 10. In other words, the other parts of the structure 10 are embedded in the metal layer body 11. Since the structure 10 is spherical, the protrusion of the uneven surface 81 is hemispherical. Furthermore, as... Figure 2A As shown, the uneven surface 81 of the metal layer 322 engages with the uneven surface of each of the inner terminal electrodes 71 and 72 (for example, the uneven surface 61 of the inner terminal electrode 71).

[0118] In addition, a metal layer 322 is provided with Figure 1 The insulating region 12 is indicated by the rectangle shown by the dashed line. In this embodiment, the insulating region 12 is a region extending in the y-axis direction. The metal layer 322 located on the negative side of the x-axis relative to the insulating region 12 and the metal layer 322 located on the positive side of the x-axis relative to the insulating region 12 are insulated by the insulating region 12.

[0119] The inner resin layers 311 and 321 and the outer resin layers 313 and 323 are resin layers composed of resins such as polyethylene resin or polypropylene resin. The metal layer 312 and the metal layer body 11 are layers composed of metals such as aluminum. The thickness of the metal layer 312 and the metal layer body 11 is, for example, tens of μm to 1 mm. In addition, in order to suppress the intrusion of moisture or oxygen from the outside of the battery 1, the thickness of the metal layer 312 and the metal layer body 11 can be greater than half the size of a structure 10. The thickness of the metal layer 312 and the metal layer body 11 can be about 2 to 10 times the size of a structure 10. The first laminate 31 is a film having a laminated structure composed of the above-described materials, and a known laminate can be used. In addition, the second laminate 32 can be a film having the above-described known laminate and a structure 10 constituting part of the metal layer 322. The first laminate 31 and the second laminate 32 each have, for example, a three-layer structure in which inner resin layers 311 and 321, metal layers 312 and 323, and outer resin layers 313 and 323 are sequentially stacked. The number of layers in the first laminate 31 and the second laminate 32 is not limited to three layers, and laminates with a number of layers corresponding to the target specifications can be used.

[0120] The sealing portion 5 is the portion where the ends of the first laminate 31 and the second laminate 32 are adhered. In this embodiment, the outer peripheral ends of the first laminate 31 and the second laminate 32 are tightly joined and sealed to each other, thereby forming the sealing portion 5. The sealing portion 5 is, for example, arranged in a ring shape that surrounds the power generation element 2 when viewed from above.

[0121] Alternatively, the laminate 3 can also be formed by bending a single laminate. That is, a portion of the laminate may be the first laminate 31, and the other portion may be the second laminate 32.

[0122] The laminate 3 is constructed as described above, thereby becoming an outer casing with high flexibility and excellent barrier properties against air and moisture.

[0123] The inner terminal electrodes 71 and 72 are terminals from which current is drawn from the power generation element 2. Specifically, the power generation element 2 is provided with multiple positive and multiple negative electrodes that function as electrode extraction components, and the inner terminal electrodes 71 and 72 draw current from the multiple positive and multiple negative electrodes. One of the inner terminal electrodes 71 and 72 is connected to one of the multiple positive and multiple negative electrodes, for example, via solder. Similarly, the other of the inner terminal electrodes 71 and 72 is connected to the other of the multiple positive and multiple negative electrodes, for example, via solder.

[0124] Furthermore, multiple positive electrode tabs are led out to one end (e.g., side 22) of the power generation element 2 and gathered together, and the gathered positive electrode tabs are fixed to the bottom surface 21 of the power generation element 2 by binding or the like. Similarly, multiple negative electrode tabs are led out to the other end (e.g., side 23) of the power generation element 2 and gathered together, and the gathered negative electrode tabs are fixed to the bottom surface 21 of the power generation element 2 by binding or the like.

[0125] The inner terminal electrodes 71 and 72 are terminals that contact the sides 22 and 23 and the main surface (for example, the bottom surface 21) of the power generation element 2, respectively. Figure 1 As shown, the inner terminal electrodes 71 and 72 are L-shaped when viewed in cross-section. However, the shapes of the inner terminal electrodes 71 and 72 are not limited to the above shapes. The inner terminal electrodes 71 and 72 can also be plate-shaped, supporting the bottom surface 21 of the power generation element 2. The inner terminal electrodes 71 and 72 can also be shaped to support the side surfaces 22 and 23, the bottom surface 21, and the top surface 24 of the power generation element 2, respectively.

[0126] Inner terminal electrodes 71 and 72 are electrically connected to the metal layer 322 at inner openings 91 and 92, respectively. Thus, the metal layer 322 draws current from the power generation element 2 via the inner terminal electrodes 71 and 72. Furthermore, as described above, the metal layer 322 located on the negative x-axis side relative to the insulating region 12 and the metal layer 322 located on the positive x-axis side relative to the insulating region 12 are insulated by the insulating region 12. Therefore, the inner terminal electrodes 71 and 72 are not electrically connected through the metal layer 322.

[0127] In the regions where the inner terminal electrodes 71 and 72 respectively contact the metal layer 322, the inner terminal electrodes 71 and 72 each have concave and convex surfaces. That is, in this embodiment, the concave and convex surfaces of the inner terminal electrodes 71 and 72 are the bottom surfaces of the inner terminal electrodes 71 and 72 respectively. In addition, the bottom surfaces of the inner terminal electrodes 71 and 72 are the negative z-axis sides of the inner terminal electrodes 71 and 72 respectively.

[0128] Here, use Figure 2A and Figure 2B The inner terminal electrode 71 and the uneven surface 61 of the inner terminal electrode 71 will be described in more detail. As described above, the metal layer 322 has a metal layer body 11 and a spherical structure 10, and the uneven surface 81 of the metal layer 322 is the surface of the metal layer body 11 and the structure 10. Therefore, the convex portion of the uneven surface 81 of the metal layer 322 is spherical, and correspondingly, the concave portion of the uneven surface 61 of the inner terminal electrode 71 is hemispherical. In addition, the concave portion of the uneven surface 61 of the inner terminal electrode 71 can have a shape corresponding to the shape of the convex portion of the uneven surface 81 of the metal layer 322.

[0129] like Figure 2A As shown, the uneven surface 61 of the inner terminal electrode 71 engages with the uneven surface 81 of the metal layer 322. That is, the protrusion of the uneven surface 81 of the metal layer 322 is located in the recess of the uneven surface 61 of the inner terminal electrode 71. In other words, the structure 10 is embedded in both the inner terminal electrode 71 and the metal layer body 11. Similarly, the uneven surface of the inner terminal electrode 72 also engages with the uneven surface 81 of the metal layer 322.

[0130] The inner terminal electrodes 71 and 72 can be made of any conductive material, such as metal. For example, the inner terminal electrodes 71 and 72 are made of aluminum, but are not limited to this; they can be made of any highly conductive material.

[0131] Furthermore, the surfaces of the inner terminal electrodes 71 and 72 are insulated to suppress electrical faults (leakage or short circuits, etc.) in the battery 1. However, for example, at the location where the inner terminal electrode 71 contacts the power generation element 2 or the metal layer 322, the aforementioned insulation treatment is not performed on the surface of the inner terminal electrode 71, allowing current to be extracted. Similarly, the inner terminal electrode 72 also allows current to be extracted.

[0132] In addition, using Figure 3 The positional relationship between the inner terminal electrodes 71 and 72 and the metal layer 322 is explained. Here, the inner terminal electrode 71 is used for explanation, but the same structure is also used in the inner terminal electrode 72.

[0133] Figure 3 This is a top view showing the positional relationship of the inner terminal electrode 71, the inner opening 91, and the structure 10 in this embodiment. When viewed from above, the inner terminal electrode 71 is located inside the rectangular inner opening 91. Furthermore, when viewed from above, the structure 10 is positioned inside the area occupied by the inner terminal electrode 71 (i.e., the area corresponding to the bottom surface of the inner terminal electrode 71).

[0134] [3. Manufacturing Method]

[0135] Next, use Figures 4A to 4C The manufacturing method of battery 1 according to this embodiment will be described. Figures 4A to 4C This is a cross-sectional view showing one step of the manufacturing method of battery 1 according to this embodiment. Furthermore, the manufacturing method of battery 1 described below is just one example, and the manufacturing method of battery 1 is not limited to the following example.

[0136] First, a power generation element 2 with three battery cells 20 stacked on top of each other is prepared. The three battery cells 20 can be fabricated using known methods such as coating a current collector with a positive electrode active material, a solid electrolyte, and a negative electrode active material. The three battery cells are stacked in series, but are not limited to this; they can also be stacked in parallel. The power generation element 2 is formed using the above method.

[0137] Next, as Figure 4A As shown, the inner terminal electrodes 71 and 72 are connected to the power generation element 2. The inner terminal electrodes 71 and 72 are respectively configured to contact the side surfaces 22 and 23 and the main surface (for example, the bottom surface 21) of the power generation element 2.

[0138] Next, as Figure 4B As shown, a second laminate 32 having a three-layer structure, for example having a resin layer, an aluminum layer and a resin layer stacked sequentially, is prepared in the decompression chamber.

[0139] Furthermore, inner openings 91 and 92 are formed in the second lamination 32. The inner openings 91 and 92 extend along... Figure 4B It is formed by extending along the y-axis.

[0140] Furthermore, a power generation element 2 connected to inner terminal electrodes 71 and 72 is disposed on a second laminate 32. At this time, a structure 10 is pre-disposed above the metal layer body 11 at each inner opening 91 and 92, and the inner terminal electrodes 71 and 72 of the power generation element 2 are disposed above the inner openings 91 and 92 with respect to the structure 10.

[0141] In addition, such as Figure 4B As shown, at this point in time, the bottom surfaces 61a and 62a of the inner terminal electrodes 71 and 72, and the surfaces 81a and 82a of the metal layer body 11 at the inner openings 91 and 92 are flat surfaces.

[0142] The inner terminal electrodes 71 and 72 are pressed to electrically connect the inner openings 91 and 92 of the structure 10 to the metal layer 322. That is, by pressing the power generation element 2 and the inner terminal electrodes 71 and 72, the structure 10 is embedded in the inner terminal electrodes 71 and 72 and the metal layer body 11.

[0143] Next, as Figure 4C As shown, the first lamination film 31 is disposed on the upper surface of the power generation element 2. That is, the power generation element 2 is sandwiched and covered by the first lamination film 31 and the second lamination film 32.

[0144] The ends of the first laminate 31 and the second laminate 32, except for a portion thereof, are joined by hot pressing, thereby forming the first laminate 31 and the second laminate 32 into a bag-shaped laminate 3.

[0145] Inside the depressurization chamber, the external space of the bag-shaped laminate 3 containing the power generation element 2 is depressurized. Under depressurization, the power generation element 2 is sealed by the laminate 3 by heat-pressing the unpressed parts.

[0146] After sealing, by increasing the pressure inside the depressurization chamber to atmospheric pressure, the laminate 3 is subjected to external forces such as airflow or atmospheric pressure, tightly bonding with the power generation element 2. This process manufactures... Figure 1 The battery 1 shown. The positional displacement of the power generation element 2 caused by the external force when the pressure rises is suppressed by the structure 10 embedded between each inner terminal electrode 71 and 72 and each inner opening 91 and 92.

[0147] Furthermore, in this embodiment, the structure 10 is spherical. Therefore, when the power generation element 2 is pressed, the contact area between the inner terminal electrode 71 and the metal layer body 11 and the structure 10 can be reduced. That is, because a stronger pressure is applied to the contact areas between the inner terminal electrode 71 and the metal layer body 11 and the structure 10, the structure 10 is easily embedded in the inner terminal electrode 71 and the metal layer body 11. The same applies to the inner terminal electrode 72. Therefore, positional displacement of the power generation element 2 can be suppressed, thus further improving the reliability of the battery 1.

[0148] Furthermore, in this embodiment, the inner terminal electrodes 71 and 72 are respectively arranged to contact the side surfaces 22 and 23 and the bottom surface 21 of the power generation element 2, allowing the power generation element 2 to be supported by multiple surfaces. Therefore, it is possible to further suppress the positional displacement of the power generation element 2 caused by external forces. Thus, the reliability of the battery 1 can be further improved.

[0149] Furthermore, in the example described above, a step of pressing the power generation element 2 and the inner terminal electrodes 71 and 72 is performed before the first laminate 31 is disposed on the upper surface of the power generation element 2, but this is not a limitation. For example, this step may be omitted, and after sealing, the power generation element 2 and the inner terminal electrodes 71 and 72 may be pressed by increasing the pressure in the depressurization chamber to atmospheric pressure.

[0150] (A variation of Implementation Method 1)

[0151] Next, use Figure 5 and Figure 6 The battery of a modified example of Embodiment 1 will be described. Figure 5This is a top view showing the positional relationship of the inner terminal electrode 71a, the inner opening 91a, and the structure 10 in a modified example of this embodiment. More specifically, Figure 5 Equivalent to that described in Implementation Method 1 Figure 3 . Figure 6 This is an enlarged cross-sectional view of the structure 10 of the battery in a modified embodiment of this invention.

[0152] In this modified example, the positional relationship between the inner terminal electrode and the metal layer 322 differs from that in Embodiment 1. Apart from this difference, the battery in this modified example has the same structure as the battery 1 in Embodiment 1. Here, the inner terminal electrode 71a will be used for explanation.

[0153] In this variation, such as Figure 5 As shown, when viewed from above, the inner opening 91a is located inside the inner terminal electrode 71a. Furthermore, when viewed from above, a structure 10 is disposed inside the inner opening 91a at the position where the inner terminal electrode 71a contacts the metal layer body 11.

[0154] In this modified example, during the manufacturing process, the inner resin layer 321 deforms when the power generation element is pressed. For example, as... Figure 6 As shown, the area 3211 enclosed by the dashed circle is the area after the inner resin layer 321 has been deformed. Thus, a structure 10 is embedded in the inner terminal electrode 71a and the metal layer body 11. Furthermore, the metal layer body 11 can be deformed, and both the metal layer body 11 and the inner terminal electrode can be deformed.

[0155] (Implementation Method 2)

[0156] Next, use Figure 7 The battery of Embodiment 2 will be described. Figure 7 This is a cross-sectional view showing the schematic structure of battery 1b in this embodiment.

[0157] In Embodiment 2, the thickness of the metal layer 322b at the inner openings 91 and 92 is different from that in Embodiment 1.

[0158] Specifically, the battery 1b has the same structure as the battery 1 in Embodiment 1, except that the thickness of the metal layer 322b at the inner openings 91 and 92 is greater than the thickness of the metal layer 322b in the area where the metal layer 322b is not exposed (here, the metal layer body 11b).

[0159] like Figure 7As shown, in battery 1b, the second laminate 32b, which constitutes part of the laminate 3b, has an inner resin layer 321, a metal layer 322b, and an outer resin layer 323. Furthermore, the metal layer 322b has a structure 10 and a metal layer body 11b. Here, the metal layer bodies 11b of the inner openings 91 and 92 are respectively... Figure 7 Regions 111 and 112 are shown by the dashed lines. The thickness of the metal layer body 11b in each of regions 111 and 112 is greater than the thickness of the metal layer 322b in the region where the metal layer 322b is not exposed (i.e., the region where the metal layer 322b is sandwiched between the inner resin layer 321 and the outer resin layer 323).

[0160] This allows for an increase in the size of the structure 10, further suppressing positional shift of the power generation element 2 during the manufacturing process. Furthermore, at the point where the structure 10 contacts the metal layer body 11b, damage to the metal layer body 11b can be prevented when pressing the power generation element 2 during the manufacturing process. Therefore, the reliability of the battery 1b can be further improved. In addition, for example, the thickness of the metal layer body 11b in regions 111 and 112 is, for example, several hundred μm or more but less than 1 mm.

[0161] Furthermore, since the thickness of all metal layers 332b in the second lamination film 32 is not increased, the weight of the second lamination film 32 is not easily increased. Therefore, the weight energy density of the battery 1b is improved. In addition, since the second lamination film 32 can maintain flexibility, the productivity of the battery 1b can be improved and the cost reduced.

[0162] (Implementation Method 3)

[0163] Next, use Figure 8 The battery of Embodiment 3 will be described. Figure 8 This is a cross-sectional view showing the schematic structure of the battery 1c according to this embodiment.

[0164] The battery 1c of this embodiment has the same structure as the battery 1 of embodiment 1, except for the following two points. Specifically, the following two points are: the structure 10 is not provided; and the cross-sectional shape of the convex portion of the concave and convex surfaces 61c and 62c and the convex portion of the concave and convex surfaces 81c and 82c is rectangular.

[0165] In this embodiment, the inner terminal electrodes 71c and 72c have concave and convex surfaces 61c and 62c, respectively, and the metal layer 322c has concave and convex surfaces 81c and 82c. The shapes of the concave and convex surfaces 61c and 62c, and 81c and 82c, are as follows: the cross-sectional shape of each convex portion is rectangular, and when viewed from above, it is a stripe shape extending along the y-axis direction, but it is not limited to this. For example, the shape of the convex portion of one of the concave and convex surfaces 61c and 81c, or one of the concave and convex surfaces 62c and 82c, may be cubic, and when viewed from above, the convex portions may be arranged in a matrix or randomly.

[0166] The battery 1c of this embodiment is manufactured in the same manner as the battery 1 of Embodiment 1, as described below as an example.

[0167] Before the inner terminal electrodes 71c and 72c are connected to the power generation element 2, uneven surfaces 61c and 62c are formed on the bottom surface of each of the inner terminal electrodes 71c and 72c. The uneven surfaces 61c and 62c are not particularly limited and can be manufactured by processing such as sandblasting, etching or laser.

[0168] Then, the power generation element 2, which is connected to the inner terminal electrodes 71c and 72c, is placed on the second laminate 32c of the laminate 3c, and the power generation element 2 and the inner terminal electrodes 71c and 72c are pressed.

[0169] In this case, before pressing the power generation element 2 and the inner terminal electrodes 71c and 72c, the metal layer 322c of the second laminate 32 has a flat surface at the inner openings 91 and 92. That is, by pressing the power generation element 2 and the inner terminal electrodes 71c and 72c, uneven surfaces 81c and 82c are formed on the metal layer 322c, and the uneven surfaces 61c and 81c engage with the uneven surfaces 62c and 82c.

[0170] Therefore, during the manufacturing process, the power generation element 2 is not easily moved relative to the second laminate 32c due to the uneven surfaces 61c and 62c and 81c and 82c; that is, the placement position of the power generation element 2 is determined. In other words, the positioning of the power generation element 2 is performed. Furthermore, during the manufacturing process, the power generation element 2 is subjected to external forces due to the airflow in the environment when the pressure rises to atmospheric pressure and the deformation or movement of the laminate 3c caused by the airflow. Since the uneven surfaces 61c and 81c engage with the uneven surfaces 62c and 82c, even if these external forces are applied to the power generation element 2, the movement of the power generation element 2 is restricted, and the positional deviation of the power generation element 2 is suppressed.

[0171] Furthermore, since the power generation element can be positioned without the use of adhesives, the volatilization of volatile substances in the adhesive can be suppressed during the sealing process. Therefore, performance degradation of the power generation element 2 due to volatile substances can be suppressed. Additionally, since adhesives can be eliminated, deformation of the power generation element 2 due to adhesive curing can also be suppressed.

[0172] That is, the relative positioning of the power generation element 2 and the laminate 3c can be easily achieved, and a highly reliable battery 1c can be realized.

[0173] Alternatively, after the inner terminal electrodes 71c and 72c are connected to the power generation element 2, uneven surfaces 61c and 62c can be formed on the bottom surfaces of the inner terminal electrodes 71c and 72c. Alternatively, before pressing the power generation element 2 and the inner terminal electrodes 71c and 72c, the bottom surfaces of the inner terminal electrodes 71c and 72c can be flat, and the metal layer 322c can have uneven surfaces 81c and 82c at the inner openings 91 and 92, respectively. In this case, by pressing the power generation element 2 and the inner terminal electrodes 71c and 72c, uneven surfaces 61c and 62c are also formed on the bottom surfaces of the inner terminal electrodes 71c and 72c.

[0174] (Implementation Method 4)

[0175] Next, use Figure 9 The battery of Embodiment 4 will be described. Figure 9 This is a cross-sectional view showing the schematic structure of the battery 1d according to this embodiment.

[0176] The battery 1d of this embodiment has the same structure as the battery 1c of embodiment 3, except for the following three points. Specifically, the following three points are: the cross-sectional shape of the convex portion of the concave and convex surfaces 61d and 62d is semi-circular, and the cross-sectional shape of the concave portion of the concave and convex surfaces 81d and 82d is semi-circular; the outer openings 93 and 94 are provided in the outer resin layer 323; and the battery 1d has outer terminal electrodes 73d and 74d.

[0177] In this embodiment, the inner terminal electrodes 71d and 72d have concave and convex surfaces 61d and 62d, respectively, and the metal layer 322d has concave and convex surfaces 81d and 82d. The shapes of the concave and convex surfaces 61d and 62d are as follows: the cross-sectional shape of each convex portion is semi-circular, and when viewed from above, it has a stripe shape extending along the y-axis direction, but is not limited to this. Alternatively, the shape of the convex portion of each of the concave and convex surfaces 61d and 62d may be hemispherical, and when viewed from above, the convex portions may be arranged in a matrix or randomly. The shapes of the convex portions of the concave and convex surfaces 61d and 62d are not limited to the above; for example, the convex portions of each of the concave and convex surfaces 61d and 62d may also have curved surfaces.

[0178] Furthermore, the shape of the concave portion of each of the concave and convex surfaces 81d and 82d only needs to correspond to the convex portion of each of the concave and convex surfaces 61d and 62d, for example, a hemispherical concave portion.

[0179] The laminate 3d of this embodiment includes a first laminate 31, a second laminate 32d, and a sealing portion 5. Furthermore, the second laminate 32d includes an inner resin layer 321, a metal layer 322d, and an outer resin layer 323.

[0180] The outer resin layer 323 has outer openings 93 and 94 that serve as spaces for exposing the metal layer 322d. That is, the metal layer 322d is not covered by the outer resin layer 323 in the outer openings 93 and 94. In this embodiment, the outer openings 93 and 94 are located on opposite sides of the inner openings 91 and 92, respectively, relative to the metal layer 322d. The outer openings 93 and 94 extend along... Figure 9 The way the y-axis extends is set.

[0181] The outer terminal electrodes 73d and 74d are electrically connected to the metal layer 322d at the outer openings 93 and 94, respectively. Therefore, the outer terminal electrodes 73d and 74d draw current from the power generation element 2 via the metal layer 322d and the inner terminal electrodes 71d and 72d, respectively.

[0182] The outer terminal electrodes 73d and 74d have a plate shape and are connected to the metal layer 322d on one side of the plate shape. However, the shape of the outer terminal electrodes 73d and 74d is not limited to the above shape.

[0183] Furthermore, the positions of the outer openings 93 and 94 are not limited to the positions described above. The positions of the outer openings 93 and 94 are not particularly limited as long as current can be drawn from the power generation element 2 through the metal layer 322d and the inner terminal electrodes 71d and 72d.

[0184] The battery 1d of this embodiment is manufactured in the same manner as the battery 1 of Embodiment 1, as described below as an example.

[0185] Before the inner terminal electrodes 71d and 72d are connected to the power generation element 2, concave and convex surfaces 61d and 62d are formed on the bottom surface of the inner terminal electrodes 71d and 72d respectively.

[0186] Then, the power generation element 2, which is connected to the inner terminal electrodes 71d and 72d, is placed on the second laminate 32d, which has inner openings 91 and 92 and outer openings 93 and 94, and the power generation element 2 and the inner terminal electrodes 71d and 72d are pressed.

[0187] In this configuration, before pressing the power generation element 2 and the inner terminal electrodes 71c and 72c, the metal layer 322d has a flat surface at the inner openings 91 and 92. That is, by pressing the power generation element 2 and the inner terminal electrodes 71d and 72d, uneven surfaces 81d and 82d are formed on the metal layer 322d, and these uneven surfaces 61d and 81d engage with each other.

[0188] Therefore, similar to embodiment 3, the relative positioning of the power generation element 2 and the laminate 3d can be easily achieved, and a highly reliable battery 1d can be realized.

[0189] Furthermore, the outer terminal electrodes 73d and 74d are formed in a manner that electrically connects to the metal layer 322d at the outer openings 93 and 94, respectively. By providing the outer openings 93 and 94, current can be extracted from the power generation element 2 via the metal layer 322d through the outer openings 93 and 94, respectively. Therefore, the design flexibility, such as the design of extracting current from the battery 1d, is increased. Moreover, the outer terminal electrodes 73d and 74d can extract current from the outer openings 93 and 94, respectively. Therefore, the design flexibility, such as the arrangement of the outer terminal electrodes 73d and 74d, is increased.

[0190] (Other implementation methods)

[0191] The above description illustrates one or more battery embodiments and modifications, but this disclosure is not limited to these embodiments and modifications. Various modifications conceived by those skilled in the art to the embodiments and modifications, as well as combinations of constituent elements from different embodiments and modifications, are also included within the scope of this disclosure, provided they do not depart from its spirit.

[0192] For example, the elastic modulus of the structure can be greater than the elastic modulus of the inner terminal electrode and the metal layer body. Additionally, the hardness of the structure can be greater than the hardness of the inner terminal electrode and the metal layer body. Here, hardness is defined, for example, by Rockwell hardness, Vickers hardness, Brinell hardness, Shore hardness, etc., but is not limited to these. By adopting the above structure, the structure becomes easier to embed in the inner terminal electrode and the metal layer body.

[0193] Furthermore, the above embodiments can be modified, replaced, added, omitted, etc. within the scope of the claims or their equivalents.

[0194] Industrial applicability

[0195] The battery disclosed herein can be used, for example, in vehicle batteries or batteries contained in various electronic devices.

[0196] Explanation of reference numerals in the attached figures

[0197] 1, 1b, 1c, 1d batteries

[0198] 2 power generation components

[0199] 3, 3b, 3c, 3d laminated films

[0200] 5 Sealing section

[0201] 10 Structures

[0202] 11, 11b metal layer main body

[0203] 12 insulation zones

[0204] 20 battery cells

[0205] 21 Bottom

[0206] Side views of 22 and 23

[0207] 24 upper surface

[0208] 31 First lamination

[0209] 32, 32b, 32c, 32d Second lamination

[0210] 61, 61c, 61d, 62c, 62d concave and convex surfaces

[0211] 61a, 62a bottom surface

[0212] Inner terminal electrodes of 71, 72, 71a, 71c, 72c, 71d, and 72d

[0213] 73d and 74d outer terminal electrodes

[0214] 81, 81c, 81d, 82c, 82d concave and convex surfaces

[0215] 81a surface

[0216] Inner openings of 91, 91a, and 92

[0217] 93, 94 Outer openings

[0218] Areas 111, 112, and 3211

[0219] 311 inner resin layer

[0220] 312 metal layer

[0221] 313 outer resin layer

[0222] 321 Inner Resin Layer

[0223] 322, 322b, 322c, 322d metal layers

[0224] 323 outer resin layer

Claims

1. A battery, wherein, Possessing: a power generating element including a positive electrode layer, a negative electrode layer, and an electrolyte layer between the positive electrode layer and the negative electrode layer; an inner side terminal electrode electrically connected to the power generating element; and a laminate film that houses the power generating element and the inner side terminal electrode, the laminate film has: a metal layer; an inner side resin layer on the power generating element side compared to the metal layer; and an outer side resin layer on the opposite side of the inner side resin layer compared to the metal layer, an inner side opening portion that exposes the metal layer is provided in the inner side resin layer, the inner side terminal electrode is electrically connected to the metal layer at the inner side opening portion, the inner side terminal electrode and the metal layer each have a concave-convex surface in a region where the inner side terminal electrode and the metal layer are in contact, the concave-convex surface of the inner side terminal electrode engages with the concave-convex surface of the metal layer.

2. The battery according to claim 1, wherein the metal layer has a metal layer main body and a structure, the convex portion of the concave-convex surface of the metal layer is part of the structure.

3. The battery according to claim 2, wherein the structure has electrical conductivity.

4. The battery according to claim 2 or 3, wherein the structure is composed of a metal.

5. The battery according to claim 2 or 3, wherein the structure is a spherical particle.

6. The battery according to any one of claims 1 to 3, wherein the inner side terminal electrode is in contact with a side surface and a main surface of the power generating element.

7. The battery according to any one of claims 1 to 3, wherein an outer side opening portion that exposes the metal layer is provided in the outer side resin layer.

8. The battery according to claim 7, wherein an outer side terminal electrode electrically connected to the metal layer at the outer side opening portion is further provided.

9. The battery according to any one of claims 1 to 3, wherein the thickness of the metal layer at the inner side opening portion is thicker than the thickness of the metal layer in a region where the metal layer is not exposed.

10. The battery according to any one of claims 1 to 3, wherein the electrolyte layer is a solid electrolyte layer including a solid electrolyte having lithium ion conductivity.

11. A manufacturing method of a battery, the battery possessing: a power generating element including a positive electrode layer, a negative electrode layer, and an electrolyte layer between the positive electrode layer and the negative electrode layer; an inner side terminal electrode; and a laminate film that houses the power generating element and the inner side terminal electrode, the manufacturing method of the battery including: a preparation step of preparing the laminate film, the laminate film having a metal layer and an inner side resin layer on the power generating element side compared to the metal layer, and an inner side opening portion that exposes the metal layer being provided in the inner side resin layer; a placement step of placing a structure in the inner side opening portion; a pressing step of pressing the inner side terminal electrode electrically connected to the power generating element so that the inner side terminal electrode is electrically connected to the metal layer at the inner side opening portion in which the structure is placed by the placement step.

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