Battery and method for manufacturing a battery

Abstract

The present invention provides a battery or the like that can achieve both miniaturization and high reliability when using an outer casing made of laminate film. [Solution] The battery 1 comprises a power generation element 10 and an outer casing 20 made of laminate film that seals the power generation element 10. The outer casing 20 is positioned to surround the power generation element 10 in a plan view with respect to the main surface of the power generation element 10 and has an overlapping portion 30 in which laminate film is overlapped. The overlapping portion 30 includes a rising portion 31, which is the end of the overlapping portion 30 located on the first direction side of the power generation element 10 in a plan view, and a rising portion 32, which is the end of the overlapping portion 30 on the second direction side that intersects the first direction of the power generation element 10 in a plan view. The rising portion 31 and the rising portion 32 are joined to each other.

Description

Technical Field

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[0001] The present disclosure relates to a battery and a method for manufacturing the battery.

Background Art

[0002] Patent Documents 1 and 2 disclose bending a heat-sealed portion of a laminated battery cell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, further miniaturization and improved reliability of the battery are desired.

[0005] In particular, miniaturization and mechanical reliability of a battery housed in a laminate film-type exterior body are important points in practical characteristics.

[0006] Therefore, the present disclosure provides a battery and a method for manufacturing the same that can achieve both miniaturization and high reliability when using an exterior body composed of a laminate film.

Means for Solving the Problems

[0007] A battery according to one aspect of the present disclosure comprises a power generation element and an outer casing made of a laminate film that seals the power generation element, wherein the outer casing is positioned to surround the power generation element in a plan view with respect to the main surface of the power generation element and has an overlapping portion in which the laminate films are overlapped, the overlapping portion includes a first rising portion in which the end of the overlapping portion located on the first direction side of the power generation element in the plan view is raised, and a second rising portion in which the end of the overlapping portion on the second direction side intersecting the first direction of the power generation element in the plan view is raised, the first rising portion and the second rising portion are joined to each other.

[0008] A method for manufacturing a battery according to one aspect of the present disclosure includes the steps of: sealing the power generation element with an outer casing made of laminate film by covering the power generation element with a laminate film and forming an overlapping portion by overlapping the laminate film at a position surrounding the power generation element in a plan view with respect to the main surface of the power generation element; forming a first raised portion by raising the end of the overlapping portion, where the end of the overlapping portion located on the first direction side of the power generation element in the plan view is raised, and a second raised portion by raising the end of the overlapping portion on the second direction side intersecting the first direction of the power generation element in the plan view; and joining the first raised portion and the second raised portion. [Effects of the Invention]

[0009] According to this disclosure, a battery using an outer casing made of laminate film can achieve both miniaturization and high reliability. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a top view of a battery according to Embodiment 1. [Figure 2] Figure 2 is a cross-sectional view of the battery according to Embodiment 1. [Figure 3] Figure 3 is a side view of the battery according to Embodiment 1. [Figure 4]FIG. 4 is a side view showing another example of the height of the rising portion according to Embodiment 1. [Figure 5] FIG. 5 is a flowchart showing an example of a method for manufacturing a battery according to Embodiment 1. [Figure 6A] FIG. 6A is a cross-sectional view of an example of a unit cell according to Embodiment 1. [Figure 6B] FIG. 6B is a cross-sectional view of another example of a unit cell according to Embodiment 1. [Figure 6C] FIG. 6C is a cross-sectional view of yet another example of a unit cell according to Embodiment 1. [Figure 7] FIG. 7 is a cross-sectional view of a power generation element having a plurality of battery cells according to Embodiment 1. [Figure 8A] FIG. 8A is a top view of an electrode lead and a counter electrode lead according to Embodiment 1. [Figure 8B] FIG. 8B is a side view of an electrode lead and a counter electrode lead according to Embodiment 1. [Figure 9] FIG. 9 is a top view of a battery during manufacturing according to Embodiment 1. [Figure 10] FIG. 10 is a cross-sectional view of a battery during manufacturing according to Embodiment 1. [Figure 11] FIG. 11 is a top view of a battery during manufacturing after FIG. 10. [Figure 12] FIG. 12 is a top view of a battery during manufacturing according to Modification 1 of Embodiment 1. [Figure 13] FIG. 13 is a top view of a battery according to Modification 1 of Embodiment 1. [Figure 14] FIG. 14 is a cross-sectional view of a battery during manufacturing according to Modification 2 of Embodiment 1. [Figure 15] FIG. 15 is a cross-sectional view of a battery according to Modification 2 of Embodiment 1. [Figure 16] FIG. 16 is a side view of a battery according to Modification 2 of Embodiment 1. [Figure 17] FIG. 17 is a side view showing another example of the height of the rising portion according to Modification 2 of Embodiment 1. [Figure 18]FIG. 18 is a top view of a battery during manufacturing according to Modification 3 of Embodiment 1. [Figure 19] FIG. 19 is a top view of a battery according to Modification 3 of Embodiment 1. [Figure 20] FIG. 20 is a top view of a battery during manufacturing according to Modification 4 of Embodiment 1. [Figure 21] FIG. 21 is a top view of a battery according to Modification 4 of Embodiment 1. [Figure 22] FIG. 22 is a top view of a battery according to Embodiment 2. [Figure 23] FIG. 23 is a top view of another battery according to Embodiment 2. [Figure 24] FIG. 24 is a top view of a battery according to Modification 1 of Embodiment 2. [Figure 25] FIG. 25 is a top view of a battery according to Embodiment 3. [Figure 26] FIG. 26 is a top view of another battery according to Embodiment 3. [Figure 27] FIG. 27 is a top view of a battery during manufacturing according to Embodiment 3. [Figure 28] FIG. 28 is a top view of another battery during manufacturing according to Embodiment 3. [Figure 29] FIG. 29 is a side view showing an example of a wiring board on which another battery according to Embodiment 3 is mounted.

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] (SUMMARY OF THE DISCLOSURE) Hereinafter, as an overview of the present disclosure, examples of a battery and a method for manufacturing the battery according to the present disclosure are shown.

[0012] A battery according to a first aspect of the present disclosure comprises a power generation element and an outer casing made of a laminate film that seals the power generation element, wherein the outer casing is positioned to surround the power generation element in a plan view with respect to the main surface of the power generation element and has an overlapping portion where the laminate films are overlapped, the overlapping portion includes a first rising portion where the end of the overlapping portion located on the first direction side of the power generation element in the plan view is raised, and a second rising portion where the end of the overlapping portion on the second direction side intersecting the first direction of the power generation element in the plan view is raised, the first rising portion and the second rising portion are joined to each other.

[0013] This makes it possible to achieve both miniaturization and high reliability in batteries using an outer casing made of laminate film.

[0014] Specifically, the superimposed portion surrounding the power generation element effectively suppresses the intrusion of moisture into the outer casing, which can cause deterioration of the power generation element. Furthermore, because the edges of the superimposed portion are raised, the projected area of ​​the battery can be reduced. In addition, since the first and second raised portions are joined, a robust structure is formed, making it easier for the raised state to be maintained even when the first and second raised portions are subjected to external forces. For example, the raised structure is maintained until the joint between the first and second raised portions is broken, thereby suppressing the application of external forces to the power generation element. Thus, the mechanical reliability of the battery is improved.

[0015] Furthermore, for example, a battery according to a second aspect of this disclosure is a battery according to a first aspect, wherein the power generation element may be sealed under reduced pressure within the outer casing.

[0016] This reduces the amount of moisture inside the casing and also allows for a thinner battery.

[0017] Furthermore, for example, a battery according to a third aspect of this disclosure is a battery according to the first or second aspect, wherein in the overlapping portion, the overlapping laminate films may be heat-fused together.

[0018] This further suppresses the intrusion of moisture into the exterior.

[0019] Furthermore, for example, a battery according to a fourth aspect of the present disclosure is a battery according to any one of the first to third aspects, wherein the first rising portion and the second rising portion may be joined by thermal fusion.

[0020] This allows the first rising section and the second rising section to be joined without increasing the volume and weight of the battery.

[0021] Furthermore, for example, a battery according to a fifth aspect of the present disclosure is a battery according to any one of the first to fourth aspects, wherein at least one of the first rising portion and the second rising portion may rise to a position higher than the height of the battery at the location where the power generation element is located in the plan view.

[0022] This allows the first and second rising sections to withstand external forces from the height direction, thereby mitigating the application of external forces to the power generation element.

[0023] Furthermore, for example, a battery according to the sixth aspect of the present disclosure is a battery according to any one of the first to fifth aspects, wherein the first rising portion and the second rising portion have a contact portion that is joined to each other by surface contact and a non-contact portion that is not in contact with each other, and the contact portion may be provided at a position closer to the power generation element than the non-contact portion.

[0024] As a result, the bulky contact portion that is joined by surface contact is positioned inside the first and second rising portions, thereby reducing the projected area of ​​the exterior body.

[0025] Furthermore, for example, a battery according to the seventh aspect of the present disclosure is a battery according to any one of the first to fifth aspects, wherein the first rising portion and the second rising portion have a contact portion that is joined to each other by surface contact and a non-contact portion that is not in contact with each other, and the contact portion may be provided at a position further from the power generation element than the non-contact portion.

[0026] As a result, the contact portion is positioned outside the first and second rising portions, making it less susceptible to limitations imposed by other components during the formation of the contact portion, and allowing for easy formation of the contact portion.

[0027] Furthermore, for example, a battery according to the eighth aspect of the present disclosure is a battery according to any one of the first to seventh aspects, wherein the first rising portion and the second rising portion have a contact portion that is joined to each other in surface contact and a non-contact portion that is not in contact with each other, and the contact portion may be joined to the non-contact portion.

[0028] This further strengthens the structure of the first and second rising sections.

[0029] Furthermore, for example, a battery according to the ninth aspect of the present disclosure is a battery according to any one of the first to fifth aspects, wherein in the plan view, the first rising portion and the second rising portion may be joined to each other at their tips in a direction perpendicular to their own thickness direction.

[0030] This allows for smaller batteries.

[0031] Furthermore, for example, a battery according to the tenth aspect of the present disclosure is a battery according to any one of the first to ninth aspects, further comprising an auxiliary material attached to the first rising portion and the second rising portion, wherein the first rising portion and the second rising portion are joined via the auxiliary material.

[0032] This allows the power generation elements to be protected even by auxiliary materials.

[0033] Furthermore, for example, the battery according to the 11th aspect of this disclosure is the battery according to the 10th aspect, and the auxiliary material may be attached to the first rising portion and the second rising portion by a crimping mechanism.

[0034] This allows auxiliary materials to be easily and securely attached to the first and second rising sections.

[0035] Furthermore, for example, a battery according to the twelfth aspect of the present disclosure is a battery according to any one of the first to eleventh aspects, wherein the superimposed portion is provided offset to one side from the center of the power generation element in the thickness direction of the power generation element, and the first rising portion and the second rising portion may rise toward the other side in the thickness direction of the power generation element.

[0036] This allows for securing the height of the first and second rising sections while suppressing an increase in the volume occupied in the thickness direction of the battery, and protects the power generation element from external forces from both sides in the thickness direction of the battery.

[0037] Furthermore, for example, the battery according to the 13th aspect of this disclosure is a battery according to any one of the 1st to 12th aspects, and the power generation element may be an all-solid-state battery.

[0038] This allows for the protection of all-solid-state batteries, which are prone to material collapse and other issues, by an external casing.

[0039] Furthermore, for example, a battery according to a 14th aspect of the present disclosure is a battery according to any one of the 1st to 13th aspects, wherein the first rising portion and the second rising portion may be inclined at an angle of 45° or more with respect to the main surface of the power generation element.

[0040] This allows for an even smaller projected area of ​​the battery.

[0041] Furthermore, for example, a battery according to a 15th aspect of the present disclosure is a battery according to any one of the 1st to 14th aspects, further comprising a lead connected to the power generation element and partly disposed within the casing, wherein the lead is drawn out from the casing at the second rising portion, and the entire lead may overlap with the casing in the plan view.

[0042] This allows for a reduction in the overall projected area of ​​the battery, including the leads.

[0043] Furthermore, a method for manufacturing a battery according to a 16th aspect of the present disclosure includes the steps of: sealing the power generation element with an outer casing made of laminate film by covering the power generation element with a laminate film and forming an overlapping portion by overlapping the laminate film at a position surrounding the power generation element in a plan view with respect to the main surface of the power generation element; forming a first raised portion by raising the end of the overlapping portion so that the end of the overlapping portion located on the first direction side of the power generation element in the plan view is raised, and a second raised portion by raising the end of the overlapping portion on the second direction side intersecting the first direction of the power generation element in the plan view; and joining the first raised portion and the second raised portion.

[0044] This makes it possible to manufacture batteries that achieve both miniaturization and high reliability, as described above.

[0045] Furthermore, for example, the battery manufacturing method according to the 17th aspect of this disclosure is the battery manufacturing method according to the 16th aspect, wherein in the step of sealing the power generation element, the power generation element may be sealed with the outer casing by heat-sealing the overlapping laminate films of the overlapping portions together.

[0046] This further suppresses the intrusion of moisture into the exterior.

[0047] Furthermore, for example, the battery manufacturing method according to the 18th aspect of this disclosure is the battery manufacturing method according to the 16th or 17th aspect, and the power generation element may be an all-solid-state battery.

[0048] This allows for the protection of all-solid-state batteries, which are prone to material collapse and other issues, by an external casing.

[0049] Furthermore, for example, a battery manufacturing method according to the 19th aspect of this disclosure is a battery manufacturing method according to any one of the 16th to 18th aspects, wherein in the step of forming the first rising portion and the second rising portion, before raising the end of the overlapping portion, a cut may be formed in the overlapping portion, and the first rising portion and the second rising portion may be formed by raising both sides of the cut.

[0050] This makes it less likely for the first and second rising sections to interfere with each other when forming them, and allows the edges of the overlapping section to be easily raised.

[0051] Furthermore, for example, a battery manufacturing method according to the 20th aspect of this disclosure is a battery manufacturing method according to any one of the 16th to 18th aspects, wherein in the step of forming the first rising portion and the second rising portion, a notch may be formed in the overlapping portion before raising the end of the overlapping portion, and the first rising portion and the second rising portion may be formed by raising both sides of the notch.

[0052] This makes it less likely for the first and second rising sections to interfere with each other when forming them, and allows the edges of the overlapping section to be easily raised.

[0053] Embodiments of the present disclosure will be described below with reference to the drawings.

[0054] The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure. Furthermore, any components in the following embodiments that are not described in an independent claim will be described as optional components.

[0055] Furthermore, each figure is a schematic diagram and not necessarily a strictly accurate representation. Therefore, for example, the scale may not necessarily match in each figure. Also, in each figure, substantially identical components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0056] Furthermore, in this specification, terms indicating relationships between elements such as parallelism, terms indicating the shape of elements such as rectangles, and numerical ranges do not represent only strict meanings, but also include substantially equivalent ranges, such as differences of a few percent.

[0057] Furthermore, in this specification and the drawings, the x, y, and z axes represent the three axes of a three-dimensional Cartesian coordinate system. The x and y axes are parallel to the first side and the second side perpendicular to the first side of the rectangle, respectively, when the plan view shape of the power generation element of the battery is rectangular. The z axis is parallel to the thickness direction and the stacking direction of the power generation element.

[0058] Furthermore, in this specification, the "stacking direction" of the power generation element coincides with the direction normal to the main surface of each layer of the current collector and battery cell. Also, in this specification, "plan view" means a view from a direction perpendicular to the main surface of the power generation element, unless otherwise specified.

[0059] Furthermore, in this specification, the terms "upper" and "lower" do not refer to the upward (vertically upward) and downward (vertically downward) directions in absolute spatial perception, but rather to terms defined by the relative positional relationship based on the stacking order in a stacked configuration. In addition, the terms "upper" and "lower" apply not only when two components are spaced apart and another component exists between them, but also when two components are placed in close proximity and touching each other. In the following description, the negative side of the z-axis is referred to as "lower" or "bottom," and the positive side of the z-axis is referred to as "upper" or "top."

[0060] Furthermore, in this specification, ordinal numbers such as "first," "second," etc., do not mean the number or order of components unless otherwise specified, but are used to avoid confusion between similar components and to distinguish them.

[0061] (Embodiment 1) The following describes the battery according to Embodiment 1.

[0062] [composition] First, the configuration of the battery according to Embodiment 1 will be described.

[0063] Figure 1 is a top view of the battery 1 according to this embodiment. Figure 2 is a cross-sectional view of the battery 1 according to this embodiment. Figure 3 is a side view of the battery 1 according to this embodiment. Specifically, Figure 1 is a plan view of the battery 1 as seen from the positive z-axis side, that is, a plan view of the upper main surface 15 of the power generation element 10. In Figure 1, the plan view shape of the power generation element 10 and the boundary of the overlapping portion 30 in the casing 20 are shown by dashed lines. Figure 2 shows a cross-section along the line II-II shown in Figure 1. Figure 3 is a plan view of the battery 1 as seen from the negative y-axis side. In this disclosure, for clarity, the overlapping portion 30 in the casing 20 is given a dot pattern in the plan views of the battery, such as Figures 1 and 3. In addition, the rising portion of the overlapping portion 30 has a dot pattern with a higher density than other parts. Furthermore, in the plan views of the battery, such as Figures 1 and 3, the illustration of the two laminate films overlapping at the end face of the outer casing 20 is omitted.

[0064] As shown in Figures 1 to 3, the battery 1 comprises a power generation element 10, an outer casing 20, an electrode lead 91, a counter electrode lead 92, and a sleeve 93.

[0065] The power generation element 10 has a structure in which one or more battery cells 100 and one or more current collectors are stacked along the thickness direction.

[0066] The plan view shape of the power generation element 10 is rectangular, as shown in Figure 1, for example. In other words, the shape of the power generation element 10 is a flattened rectangular parallelepiped. Here, "flattened" means that the thickness (i.e., the length in the z-axis direction) is shorter than the length of each side of the main face (i.e., the respective lengths in the x-axis and y-axis directions) or the maximum width. The plan view shape of the power generation element 10 may also be other polygons such as a square, hexagon, or octagon, or it may be circular or elliptical. Note that in cross-sectional views such as Figure 2, the thickness of each layer is exaggerated to make the layered structure of the power generation element 10 easier to understand.

[0067] The power generation element 10 includes four side surfaces 11, 12, 13, and 14 and two main surfaces 15 and 16, as shown in Figures 1 and 2. The main surfaces 15 and 16 are the surfaces of the power generation element 10 with the largest area. In this embodiment, the side surfaces 11, 12, 13, and 14, as well as the main surfaces 15 and 16, are all flat surfaces.

[0068] Sides 11 and 13 face away from each other and are parallel to each other. Sides 12 and 14 face away from each other and are parallel to each other. The front directions of sides 11 and 13 intersect, specifically perpendicular to, the front directions of sides 12 and 14. Also, sides 11, 12, 13 and 14 are erected perpendicular to main surfaces 15 and 16 from each side of main surfaces 15 and 16. Sides 11, 12, 13 and 14 are parallel to the stacking direction. Also, sides 11 and 12, 12 and 13, 13 and 14, and 11 and 14 are adjacent to each other and intersect, specifically perpendicular to, each of them.

[0069] The main surfaces 15 and 16 are opposite each other and parallel to each other. Main surface 15 is the uppermost surface of the power generation element 10. Main surface 16 is the lowermost surface of the power generation element 10.

[0070] As shown in Figure 2, the power generation element 10 has a plurality of current collectors and a battery cell 100. The plurality of current collectors include an electrode current collector 140 electrically connected to the electrode layer 110 and a counter electrode current collector 150 electrically connected to the counter electrode layer 120. In the power generation element 10, the electrode current collector 140, the battery cell 100, and the counter electrode current collector 150 are stacked in this order along the thickness direction (z-axis direction) of the power generation element 10. The battery cell 100 is the minimum configuration of the power generation section of the battery and is also called a unit cell. In some cases, the battery cell 100 and the current collectors stacked on the battery cell 100 are collectively referred to as a unit cell.

[0071] In the example shown in Figure 2, the power generation element 10 has one battery cell 100, but this is not particularly limited, and there may be two or more. In this case, the multiple battery cells 100 are stacked via current collectors, and each battery cell 100 is sandwiched between current collectors. In this case, the multiple battery cells 100 may be connected in series or in parallel.

[0072] The battery cell 100 includes an electrode layer 110, a counter electrode layer 120, and an electrolyte layer 130. The electrode layer 110 and the counter electrode layer 120 each contain an active material and are also referred to as the electrode active material layer and the counter electrode active material layer. In the battery cell 100, the electrode layer 110, the electrolyte layer 130, and the counter electrode layer 120 are stacked in this order along the z-axis direction.

[0073] The electrode layer 110 is one of the positive and negative electrode layers of the battery cell 100. The counter electrode layer 120 is the other of the positive and negative electrode layers of the battery cell 100. In the following explanation, we will describe the case where the electrode layer 110 is the negative electrode layer and the counter electrode layer 120 is the positive electrode layer as an example.

[0074] The electrode layer 110 is located on the main surface of the electrode current collector 140. The electrode layer 110 includes, for example, a negative electrode active material as the electrode material. The electrode layer 110 is located opposite the counter electrode layer 120.

[0075] As the negative electrode active material contained in the electrode layer 110, for example, graphite, metallic lithium, and other negative electrode active materials can be used. As the material for the negative electrode active material, various materials that can release and insert ions such as lithium (Li) or magnesium (Mg) can be used.

[0076] Furthermore, as the material contained in the electrode layer 110, 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 (Li2S) and phosphorus pentasulfide (P2S5) may be used. Furthermore, as the material contained in the electrode layer 110, a conductive agent such as acetylene black, or a binding binder such as polyvinylidene fluoride may be used.

[0077] The electrode layer 110 is produced by applying a paste-like coating, which is made by kneading the materials containing the electrode layer 110 together with a solvent, onto the main surface of, for example, an electrode current collector 140, and drying it. In order to increase the density of the electrode layer 110, the electrode current collector 140 (also called an electrode plate) to which the electrode layer 110 has been coated may be pressed after drying. The thickness of the electrode layer 110 is, for example, 5 μm to 300 μm, but is not limited to this.

[0078] The counter electrode layer 120 is located on the main surface of the counter electrode current collector 150. The counter electrode layer 120 is a layer containing a positive electrode material, such as an active material. The positive electrode material is the material that constitutes the counter electrode of the negative electrode material. The counter electrode layer 120 contains, for example, a positive electrode active material.

[0079] As the positive electrode active material contained in the counter electrode layer 120, for example, positive electrode active materials such as lithium cobalt oxide composite oxide (LCO), lithium nickel oxide composite oxide (LNO), lithium manganese oxide composite oxide (LMO), lithium-manganese-nickel oxide composite oxide (LMNO), lithium-manganese-cobalt oxide composite oxide (LMCO), lithium-nickel-cobalt oxide composite oxide (LNCO), and lithium-nickel-manganese-cobalt oxide composite oxide (LNMCO) can be used. As the material for the positive electrode active material, various materials that can release and insert ions such as Li or Mg can be used.

[0080] Furthermore, as the material containing the counter electrode layer 120, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, sulfide solid electrolytes or oxide solid electrolytes may be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 may be used. The surface of the positive electrode active material may be coated with a solid electrolyte. Furthermore, as the material containing the counter electrode layer 120, a conductive agent such as acetylene black, or a binding binder such as polyvinylidene fluoride may be used.

[0081] The counter electrode layer 120 is produced by kneading the materials containing the counter electrode layer 120 together with a solvent to create a paste-like coating, which is then applied to the main surface of the counter electrode current collector 150, for example, and dried. To increase the density of the counter electrode layer 120, the counter electrode current collector 150 (also called the counter electrode plate) coated with the counter electrode layer 120 may be pressed after drying. The thickness of the counter electrode layer 120 is, for example, 5 μm to 300 μm, but is not limited to this.

[0082] The electrolyte layer 130 is placed between the electrode layer 110 and the counter electrode layer 120. The electrolyte layer 130 is in contact with both the electrode layer 110 and the counter electrode layer 120. The electrolyte layer 130 has, for example, lithium ion conductivity. The 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 electrolyte layer 130 may be 5 μm or more and 300 μm or less, or 5 μm or more and 100 μm or less.

[0083] The electrolyte layer 130 includes, for example, a solid electrolyte. In this case, the power generation element 10 is, for example, an all-solid-state battery. As the solid electrolyte, for example, an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, sulfide solid electrolytes or oxide solid electrolytes may be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 may be used. In addition to the electrolyte material, the electrolyte layer 130 may also contain a binding binder such as polyvinylidene fluoride.

[0084] In this embodiment, the electrode layer 110, the counter electrode layer 120, and the electrolyte layer 130 are maintained in a parallel, flat plate shape. This suppresses the occurrence of cracks or collapse due to curvature. Alternatively, the electrode layer 110, the counter electrode layer 120, and the electrolyte layer 130 may be smoothly curved together.

[0085] The electrode current collector 140 and the counter electrode current collector 150 are each conductive foil-shaped, plate-shaped, or mesh-shaped members. The electrode current collector 140 and the counter electrode current collector 150 may each be, for example, a conductive thin film. In the example shown in Figure 1, the electrode current collector 140 and the counter electrode current collector 150 are each composed of a single metal foil. The electrode current collector 140 and the counter electrode current collector 150 may each have a multilayer structure of multiple current-collecting layers made of multiple metal foils or the like.

[0086] The electrode current collector 140 and the counter electrode current collector 150 can be made from materials such as stainless steel (SUS), aluminum (Al), copper (Cu), or nickel (Ni). The electrode current collector 140 and the counter electrode current collector 150 may be made from different materials.

[0087] The thickness of the electrode current collector 140 and the counter electrode current collector 150 is, for example, 5 μm to 200 μm, but is not limited to this.

[0088] The electrode layer 110 is in contact with the main surface of the electrode current collector 140. In the case of the electrode current collector 140 sandwiched between two battery cells 100, the electrode layer 110 is in contact with each of the two main surfaces. In the bottom electrode current collector 140, the electrode layer 110 is in contact with only one of the two main surfaces (specifically the top surface). The electrode current collector 140 may also include a connecting layer, which is a layer containing a conductive material, provided in the portion that is in contact with the electrode layer 110.

[0089] The main surface of the counter electrode current collector 150 is in contact with the counter electrode layer 120. In the case of the counter electrode current collector 150 sandwiched between two battery cells 100, the counter electrode layer 120 is in contact with each of the two main surfaces. In the uppermost counter electrode current collector 150, the counter electrode layer 120 is in contact with only one of the two main surfaces (specifically the bottom surface). The counter electrode current collector 150 may also include a connecting layer, which is a layer containing a conductive material, provided in the portion in contact with the counter electrode layer 120.

[0090] The outer casing 20 seals the power generation element 10 enclosed within it. The power generation element 10 is, for example, vacuum-sealed within the outer casing 20. Vacuum sealing reduces the amount of moisture inside the outer casing 20 and also reduces the thickness of the battery 1.

[0091] The outer casing 20 is made of laminate film. In the example shown in Figure 2, the outer casing 20 is made of two laminate films 21a and 21b that are positioned to sandwich the power generation element 10 from above and below.

[0092] The outer casing 20 is, for example, rectangular in plan view. In the example shown in Figure 1, in plan view, each rectangle of the power generation element 10 and the outer casing 20 has two sides parallel to the x-axis and opposite to each other, and two sides parallel to the y-axis and opposite to each other.

[0093] As shown in Figures 1 and 2, the exterior body 20 has an overlapping portion 30 formed by overlapping laminate films 21a and 21b. In a plan view, the overlapping portion 30 is positioned to surround the power generation element 10. In a plan view, the overlapping portion 30 extends outside the power generation element 10. In a plan view, the power generation element 10 is surrounded by the overlapping portion 30. A gap may also be formed between the power generation element 10 and the overlapping portion 30. In the overlapping portion 30, for example, the overlapping laminate films 21a and 21b are heat-sealed together. In Figure 2, the boundary between the overlapping laminate films 21a and 21b is shown by a solid line, but in reality, the boundary may not be visible due to heat sealing. This is also true for other cross-sectional views described later. Furthermore, the laminate film constituting the outer casing 20 is not limited to two laminate films 21a and 21b, but may be a single laminate film folded, or a single bag-shaped laminate film. In this case, the overlapping portion 30 near the folded edges and edges other than the opening of the bag does not need to be heat-sealed, as this allows for sealing of the power generation element 10.

[0094] Known laminate films can be used for laminate films 21a and 21b. Laminate films 21a and 21b have a laminated structure of a resin layer made of a thermoplastic resin such as polyethylene resin or polypropylene resin and a metal layer made of a metal such as aluminum. In the laminated structure, both ends in the lamination direction are made of resin layers, and the metal layer is arranged between the resin layers at both ends. Laminate films 21a and 21b have a three-layer structure in which a first resin layer, a metal layer, and a second resin layer are laminated in this order. The types of thermoplastic resin and metal used in laminate films 21a and 21b are not particularly limited. Note that the laminated structure of laminate films 21a and 21b is not shown in each figure.

[0095] The overlapping portion 30 is located on the positive x-axis side, negative x-axis side, positive y-axis side, and negative y-axis side of the power generation element 10 in a plan view. The overlapping portion 30 is provided along all sides 11, 12, 13, and 14 of the power generation element 10 in a plan view. Furthermore, the overlapping portion 30 is parallel to the main surfaces 15 and 16 of the power generation element 10, except for, for example, the rising portions 31, 32, and 33 described below. In other words, the portion of the overlapping portion 30 adjacent to the power generation element 10 is a planar region parallel to the main surfaces 15 and 16 of the power generation element 10.

[0096] As shown in Figure 2, the portion of the overlapping section 30 adjacent to the power generation element 10 is positioned at the center of the power generation element 10 in the thickness direction of the power generation element 10. This reduces the amount of bending required for the laminate films 21a and 21b to conform to the shape of the power generation element 10, and also reduces the stress on the corners of the power generation element 10 caused by sealing with the laminate films 21a and 21b. This suppresses damage to the power generation element 10 or the laminate films 21a and 21b and reduces the risk of short circuits.

[0097] The overlapping portion 30 includes rising portions 31, 32, and 33, which are the raised ends of the overlapping portion 30. In the outer casing 20, the overlapping portion 30 extends to the end of the outer casing 20, so the end of the overlapping portion 30 is also the end of the outer casing 20. The rising portions 31, 32, and 33 are each formed by bending the outer peripheral end of the overlapping portion 30 and raising it toward the positive z-axis direction. The rising portion 31 is located on the negative x-axis side of the power generation element 10 and faces the side surface 11 without passing through the power generation element 10. The rising portion 32 is located on the negative y-axis side of the power generation element 10 and faces the side surface 12 without passing through the power generation element 10. The rising portion 33 is located on the positive x-axis side of the power generation element 10 and faces the side surface 13 without passing through the power generation element 10. In battery 1, the ends of the superimposed portion 30 on the positive y-axis side of the power generation element 10, from which the electrode leads 91 and counter electrode leads 92 are drawn out from the outer casing 20, are not raised and remain parallel to the main surfaces 15 and 16 of the power generation element 10. In this embodiment, the raised portion 31 is an example of a first raised portion, and the raised portion 32 is an example of a second raised portion. Also, the x-axis direction is an example of a first direction, and the y-axis direction is an example of a second direction.

[0098] In a plan view, the rising portions 31 and 33 extend along the y-axis, and the rising portion 32 extends along the x-axis. In a plan view, the rising portions 31 and 33 and the rising portion 32 extend in intersecting directions, specifically in orthogonal directions. In the battery 1, the rising portions 31, 32, and 33 constitute three sides of the rectangle of the outer casing 20 in a plan view.

[0099] The rising portions 31, 32, and 33 are inclined at an angle θ with respect to the main surfaces 15 and 16 of the power generation element 10 (rising portion 32 is not shown in Figure 2). The angle θ is not particularly limited, but an angle θ of 45° or more effectively reduces the projected area of ​​the outer casing 20. In the example shown in Figure 2, the angle θ is 90°. Also, from the viewpoint of effectively increasing the strength of the rising portions 31, 32, and 33, the angle θ may be 90° or less. The angles θ of each of the rising portions 31, 32, and 33 are, for example, the same, but two or more of them may be different from each other. In Figure 2, a virtual plane parallel to the main surfaces 15 and 16 of the power generation element 10 is shown by a dashed line. Also, as shown in Figure 2, the angle θ is the angle that the outer surfaces of the rising portions 31, 32, and 33 make with respect to this virtual plane.

[0100] As shown in Figures 2 and 3, in the battery 1, for example, the rising portions 31, 32, and 33 rise to a position higher than the height of the battery 1 at the location where the power generation element 10 is located in a plan view. Here, the height is the length in the thickness direction of the power generation element 10 from the bottom of the rising portions 31, 32, and 33 to the top surface of the battery 1 at the location where the power generation element 10 is located in a plan view. This allows the rising portions 31, 32, and 33 to protect the power generation element 10 from impacts from this height direction.

[0101] Furthermore, as shown in Figure 4, the heights of the risers 31, 32, and 33 in the battery 1 may be lower than the height of the battery 1 at the location where the power generation element 10 is located in a plan view. This reduces the volume occupied in the thickness direction of the battery 1. Figure 4 is a side view showing another example of the height of the riser 32. In Figure 4, only the riser 32 is shown, but the risers 31 and 33 also rise to the same height as the riser 32. Note that the heights of the risers 31, 32, and 33 may be the same, or two or more of them may be different from each other.

[0102] The heights of the rising sections 31, 32, and 33 can be adjusted, for example, by the folding position of the overlapping section 30. Furthermore, the height at which the rising sections 31, 32, and 33 rise can also be adjusted by the angle θ.

[0103] As shown in Figure 1, two adjacent rising sections 31, 32, and 33 are joined to each other by thermal fusion. In Figure 1, the boundaries between rising sections 31, 32, and 33 are schematically shown with solid lines, but in reality, the boundaries may not be visible due to thermal fusion. This is also true for the other top views described later.

[0104] In battery 1, two adjacent rising portions among the rising portions 31, 32, and 33 are the two rising portions that constitute two adjacent sides in the plan view shape of the outer casing 20. Each of the rising portions 31, 32, and 33 is joined to an adjacent rising portion at the end in the direction in which it extends in the plan view.

[0105] Specifically, the rising portion 31 and the rising portion 32 are joined to each other, and the rising portion 32 and the rising portion 33 are joined to each other. In the battery 1, in a plan view, the rising portions 31 and 32 and the rising portions 32 and 33 are joined to each other at the rectangular corners of the outer casing 20. Note that this joining is not limited to heat fusion, and may be performed by methods other than heat fusion, such as bonding with adhesive, crimping using a crimping mechanism, or screw fastening.

[0106] Two adjacent rising portions of the rising portions 31, 32, and 33 have contact portions 42a and 42b that are joined together by surface contact, and non-contact portions 41a, 41b, and 41c that are not in contact with each other. In this specification, surface contact means contact on a surface perpendicular to the thickness direction.

[0107] The contact portions 42a and 42b are joined to the non-contact portion 41b. In battery 1, the contact portions 42a and 42b are located further from the power generation element 10 than the non-contact portions 41a, 41b, and 41c. As a result, the contact portions 42a and 42b are positioned on the outside of the rising portions 31, 32, and 33, and are less restricted by other components in the formation of the contact portions 42a and 42b, making it easy to form the contact portions 42a and 42b.

[0108] Contact portion 42a is the portion where the inner surfaces of the rising portions 31 and 32 are in surface contact with each other. Contact portion 42b is the portion where the inner surfaces of the rising portions 32 and 33 are in surface contact with each other. Here, the inner surfaces are the surfaces that face the power generation element 10 when the rising portions 31, 32 and 33 are raised.

[0109] Non-contact portion 41a is the portion of the rising portion 31 that is not in contact with other rising portions. Non-contact portion 41b is the portion of the rising portion 32 that is not in contact with other rising portions. Non-contact portion 41c is the portion of the rising portion 33 that is not in contact with other rising portions.

[0110] The electrode lead 91 and the counter electrode lead 92 are extraction electrodes connected to the power generation element 10. The electrode lead 91 and the counter electrode lead 92 are each made of a conductive material such as metal. The electrode lead 91 is connected to the electrode current collector 140 on its main surface 16, for example. The counter electrode lead 92 is connected to the counter current collector 150 on its main surface 15, for example. The electrode lead 91 and the counter electrode lead 92 may be connected to the end face of the current collector, or they may be integrated with the current collector. For example, the electrode current collector 140 and the counter electrode current collector 150 may have a part that functions as a current collector and a part that functions as a lead.

[0111] Parts of the electrode leads 91 and counter electrode leads 92 are positioned inside the casing 20. The electrode leads 91 and counter electrode leads 92 are drawn out from the y-axis positive end of the casing 20 via an overlapping portion 30 located on the y-axis positive side of the power generation element 10. This allows the power generation element 10 to be charged and discharged from outside the casing 20.

[0112] The sleeve 93 is positioned between the electrode lead 91 and the outer casing 20, and between the counter electrode lead 92 and the outer casing 20, at the point where the electrode lead 91 and the counter electrode lead 92 are drawn out from the outer casing 20. The sleeve 93 is made of an insulating material that can be heat-sealed to both the electrode lead 91 and the counter electrode lead 92 and the outer casing 20. The placement of the sleeve 93 between the electrode lead 91 and the outer casing 20, and between the counter electrode lead 92 and the outer casing 20 ensures airtightness and insulation between the electrode lead 91 and the counter electrode lead 92 and the outer casing 20.

[0113] [Manufacturing method] Next, a method for manufacturing the battery 1 according to this embodiment will be described. Note that the manufacturing method described below is just one example, and the method for manufacturing the battery 1 according to this embodiment is not limited to the following example.

[0114] Figure 5 is a flowchart showing an example of a method for manufacturing the battery 1 according to this embodiment.

[0115] As shown in Figure 5, first, the power generation element 10 is prepared (step S10). For example, a unit cell having a battery cell 100 is prepared. Since the power generation element 10 has one battery cell 100, the unit cell can be used as is as the power generation element 10. If the power generation element 10 has multiple battery cells 100, the power generation element 10 is prepared by stacking the prepared unit cells. Figures 6A to 6C are cross-sectional views of an example of a unit cell, respectively.

[0116] As shown in Figure 6A, the unit cell 100a comprises one battery cell 100, an electrode current collector 140, and a counter electrode current collector 150. In the unit cell 100a, the battery cell 100 is positioned between the electrode current collector 140 and the counter electrode current collector 150, and the battery cell 100 is in contact with both the electrode current collector 140 and the counter electrode current collector 150. Specifically, the electrode layer 110 of the battery cell 100 is in contact with the electrode current collector 140, and the counter electrode layer 120 of the battery cell 100 is in contact with the counter electrode current collector 150. The unit cell 100a has the same configuration as the power generation element 10 described above.

[0117] Furthermore, as shown in Figure 6B, the unit cell 100b has one battery cell 100 and one electrode current collector 140. In the unit cell 100b, the electrode current collector 140 is positioned opposite the battery cell 100 on the electrode layer 110 side of the battery cell 100 and is in contact with the electrode layer 110. In the unit cell 100b, the main surface of the counter electrode layer 120 of the battery cell 100, on the side opposite to the electrolyte layer 130, is exposed.

[0118] Furthermore, as shown in Figure 6C, a unit cell 100c has one battery cell 100 and one counter electrode current collector 150. In unit cell 100c, the counter electrode current collector 150 is positioned opposite the battery cell 100 on the counter electrode layer 120 side of the battery cell 100 and is in contact with the counter electrode layer 120. In unit cell 100c, the main surface of the electrode layer 110 of the battery cell 100, opposite to the electrolyte layer 130 side, is exposed.

[0119] When stacking unit cells, at least one of the above-mentioned unit cells 100a, 100b, and 100c is prepared in accordance with the stacking configuration of the power generation element in the battery 1 to be manufactured. Figure 7 is a cross-sectional view of a power generation element 10a having a plurality of battery cells 100 according to this embodiment. The battery 1 may have a power generation element 10a instead of a power generation element 10. Note that batteries according to each of the modifications and embodiments described later may also have a power generation element 10a.

[0120] The power generation element 10a is a stacked battery in which multiple battery cells 100 are stacked in series via bipolar current collectors 160. The power generation element 10a is, for example, an all-solid-state battery. When preparing the power generation element 10a, for example, one unit cell 100a and two unit cells 100b or 100c are prepared and stacked. The electrode current collectors 140 or counter electrode current collectors 150 sandwiched between the battery cells 100 function as bipolar current collectors 160. Alternatively, only unit cells 100a may be stacked. In this case, two current collectors are placed between the battery cells 100. Unit cells may also be stacked so that the battery cells 100 can be connected in parallel.

[0121] Next, electrode leads 91 and counter leads 92 are formed on the main surface of the power generation element 10 (step S20). First, the electrode leads 91 and counter leads 92 are prepared. Figure 8A is a top view of the electrode leads 91 and counter leads 92. Figure 8B is a side view of the electrode leads 91 and counter leads 92. As shown in Figures 8A and 8B, the electrode leads 91 and counter leads 92 are inserted into the sleeve 93. The electrode leads 91 inserted into the sleeve 93 are connected to the electrode current collector 140 on the main surface 16, and the counter leads 92 inserted into the sleeve 93 are connected to the counter current collector 150 on the main surface 15.

[0122] Next, the power generation element 10 is sealed with the outer casing 20 (step S30). Figure 9 is a top view of the battery 2a in the process of being manufactured according to this embodiment. Figure 10 is a cross-sectional view of the battery 2a in the process of being manufactured according to this embodiment. Figure 10 shows the cross-section along the line XX shown in Figure 9.

[0123] As shown in Figures 9 and 10, for example, a power generation element 10, on which electrode leads 91 and counter electrode leads 92 are formed, is covered and sandwiched from both sides in the thickness direction of the power generation element 10 by two laminate films 21a and 21b that constitute the outer casing 20, and the laminate films 21a and 21b are overlapped at a position that surrounds the power generation element 10 in a plan view to form an overlapping portion 30. At this time, the tip ends of the electrode leads 91 and counter electrode leads 92 are exposed. Then, the power generation element 10 is sealed with the outer casing 20 by heat-sealing the laminate films 21a and 21b of the overlapping portion 30 together. As shown in Figure 9, the overlapping portion 30 is formed in all directions on the outside of the power generation element 10 in a plan view, such as the positive side in the x-axis direction, the negative side in the x-axis direction, the positive side in the y-axis direction, and the negative side in the y-axis direction. As a result, the power generation element 10 is completely surrounded by the overlapping portion 30 in a plan view. For example, the overlapping portions 30 on the positive x-axis side, negative x-axis side, positive y-axis side, and negative y-axis side of the power generation element 10 are sequentially heat-sealed with a sealer or the like. However, as described above, the overlapping portions 30 near the folded edges when the outer casing 20 is formed by folding a single laminate film, and near the edges other than the opening of the bag when it is formed from a single bag-shaped laminate film, do not need to be heat-sealed.

[0124] Furthermore, as shown in Figure 10, the superimposed portion 30 is formed so as to be located at the center of the power generation element 10 in the thickness direction of the power generation element 10.

[0125] Furthermore, the sealing of the power generation element 10 by the outer casing 20 is performed in a reduced-pressure atmosphere, such as in a vacuum chamber. This seals the power generation element 10 to the outer casing 20 under reduced pressure. Note that when sealing the power generation element 10 under reduced pressure, it is not necessary to perform all sealing operations in a reduced-pressure atmosphere; it is sufficient for the operation to be performed in a reduced-pressure atmosphere at least when the thermal fusion of all overlapping portions 30 is completed, that is, when the path between the power generation element 10 and the outside environment within the outer casing 20 is completely blocked.

[0126] The power generation element 10 is sealed by the outer casing 20, which suppresses the intrusion of moisture (water vapor) and other substances into the outer casing 20 that could cause deterioration of the power generation element 10. The laminate films 21a and 21b contain a metal layer, such as an aluminum layer, and therefore have a very high moisture-blocking effect in the thickness direction. On the other hand, in the direction perpendicular to the thickness direction of the laminate films 21a and 21b, moisture can penetrate into the outer casing 20 without going through the metal layer. For example, moisture can easily penetrate into the outer casing 20 from the edges of the laminate films 21a and 21b in the direction perpendicular to the thickness direction. In the battery 2a, an overlapping portion 30 is formed so as to surround the power generation element 10, and a certain length is heat-sealed, which suppresses the intrusion of moisture and other substances from the edges of the outer casing 20. However, in the state of the battery 2a, the projected area of ​​the outer casing 20 (i.e., the area in a plan view) is large, which is disadvantageous for miniaturization.

[0127] Next, the ends of the overlapping portion 30 are raised to form the raised portions 31, 32, and 33 (step S40). For example, the raised portions 31, 32, and 33 are formed by folding the overlapping portion 30 along the dashed line shown in Figure 9. This reduces the projected area of ​​the casing 20 compared to the battery 2a before the ends of the overlapping portion 30 are raised. Therefore, by reducing the projected area of ​​the casing 20, which does not directly contribute to power generation, the area efficiency of the battery 1 can be improved.

[0128] Specifically, in a plan view, the end of the overlapping portion 30 located on the negative x-axis side of the power generation element 10 is bent up to form a rising portion 31. As a result, region ABCD in Figure 9 rises up to form the rising portion 31.

[0129] Furthermore, in a plan view, the end of the overlapping portion 30 located on the negative side of the y-axis direction of the power generation element 10 is bent up to form a rising portion 32. As a result, the region BCFE in Figure 9 rises up to form the rising portion 32.

[0130] Furthermore, in a plan view, the end of the overlapping portion 30 located on the positive x-axis side of the power generation element 10 is bent up to form a rising portion 33. As a result, the region EFHG in Figure 9 rises up to form the rising portion 33.

[0131] Figure 11 is a top view of the battery 2b during manufacturing after Figure 10. As shown in Figure 11, the raised portions 31, 32, and 33 are formed by raising the ends of the overlapping portion 30. At the same time, by folding the corners of the outer casing 20 outward in a plan view, contact portions 42a are formed where the inner surfaces of the raised portions 31 and 32 are in surface contact with each other, and contact portions 42b are formed where the inner surfaces of the raised portions 32 and 33 are in surface contact with each other. In the battery 2b, the contact portions 42a and 42b protrude outward at the corners of the outer casing 20 in a plan view.

[0132] After forming the rising portions 31, 32, and 33, the shape of the rising portions 31, 32, and 33 may be stabilized by applying a backing plate or the like to the rising portions 31, 32, and 33 and heating them.

[0133] Next, two adjacent rising portions from the rising portions 31, 32, and 33 are joined together (step S50). For example, in battery 2b, rising portion 31 and rising portion 32 are joined by heat fusion by sandwiching contact portion 42a with a heater, and rising portion 32 and rising portion 33 are joined by heat fusion by sandwiching contact portion 42b with a heater. Furthermore, contact portions 42a and 42b are folded towards non-contact portion 41b, bringing contact portions 42a and 42b into contact with non-contact portion 41b. Then, contact portions 42a and 42b and non-contact portion 41b are joined by heat fusion using a heater or the like. This results in battery 1 shown in Figures 1 to 3.

[0134] Thus, in the battery 1, since two adjacent rising sections 31, 32, and 33 are joined together, not only can the projected area of ​​the outer casing 20 be reduced, but the rising sections 31, 32, and 33 form a robust structure, improving the mechanical reliability of the battery 1. If the rising sections 31, 32, and 33 are simply bent and not joined together, the rising structure cannot be maintained if an external force of the same magnitude required for bending is applied. As a result, the power generation element 10 becomes more susceptible to external force, increasing the risk of damage to the power generation element 10. In contrast, by joining two adjacent rising sections 31, 32, and 33, the rising structure is maintained until the joint is destroyed, and the propagation and application of external force to the power generation element 10 can be suppressed until the joint is destroyed. Therefore, both miniaturization and high reliability of the battery 1 using the outer casing 20 can be achieved.

[0135] Furthermore, the contact portions 42a and 42b may be folded towards the non-contact portion 41b before joining them, and the joining of the two adjacent rising portions, as well as the joining of the contact portions 42a and 42b and the non-contact portion 41b, may be performed all at once. In addition, the above joining is not limited to heat fusion, and may be performed by methods other than heat fusion, such as bonding with adhesive, crimping using a crimping mechanism, or screw fastening.

[0136] Alternatively, the contact portion 42a may be folded toward the non-contact portion 41a, and the contact portion 42b may be folded toward the non-contact portion 41c to join the contact portion 42a and the non-contact portion 41a, and the contact portion 42b and the non-contact portion 41c to join.

[0137] [Example 1] Next, a battery according to Modification 1 of Embodiment 1 will be described. In the following, the differences from Embodiment 1 will be the main focus of the explanation, and the similarities will be omitted or simplified.

[0138] In the manufacturing of the battery according to this modified example, the formation of the rising portions 31, 32, and 33 (step S40 above) differs from Embodiment 1 in that the corners of the outer casing 20 in a plan view are folded inward. Figure 12 is a top view of the battery 2c in the process of manufacturing according to this modified example. As shown in Figure 12, compared to the battery 2a shown in Figure 10 above, by folding the corners of the outer casing 20 in a plan view inward, contact portions 42c are formed where the outer surfaces of the rising portions 31 and 32 are in surface contact with each other, and contact portions 42d are formed where the outer surfaces of the rising portions 32 and 33 are in surface contact with each other. Here, the outer surfaces are the surfaces that face away from the power generation element 10 when the rising portions 31, 32, and 33 are raised. In the battery 2c, the contact portions 42c and 42d protrude inward at the corners of the outer casing 20 in a plan view.

[0139] Subsequently, in step S50, two adjacent rising portions from the rising portions 31, 32, and 33 are joined together. For example, in battery 2c, rising portion 31 and rising portion 32 are joined at contact portion 42c, and rising portion 32 and rising portion 33 are joined at contact portion 42d. Furthermore, contact portions 42c and 42d are folded towards the non-contact portion 41b, bringing the contact portions 42c and 42d into contact with the non-contact portion 41b. Then, the contact portions 42c and 42d and the non-contact portion 41b are joined together. This results in battery 1a as shown in Figure 13. Figure 13 is a top view of battery 1a according to this modified example.

[0140] As shown in Figure 13, the battery 1a has a configuration in which the contact portions 42a and 42a of the battery 1 according to Embodiment 1 are replaced with contact portions 42c and 42d, respectively. The contact portions 42c and 42d are joined to the non-contact portion 41b. In the battery 1a, the contact portions 42c and 42d are located closer to the power generation element 10 than the non-contact portions 41a, 41b, and 41c. This further reduces the projected area of ​​the outer casing 20, making it possible to make the battery 1a even smaller.

[0141] [Differentiation 2] Next, a battery relating to Modification 2 of Embodiment 1 will be described. In the following, the differences between Embodiment 1 and Modification 1 of Embodiment 1 will be explained, and the explanation of common points will be omitted or simplified.

[0142] In the manufacturing of the battery according to this modified example, the superimposed portion 30 is formed in the sealing of the power generation element 10 (step S30 above) by offsetting it from the center in the thickness direction of the power generation element 10, which is different from the first embodiment. Figure 14 is a cross-sectional view of the battery 2d during the manufacturing process according to this modified example. As shown in Figure 14, the power generation element 10 is sandwiched between two laminate films 21a and 21b that constitute the outer casing 20, and the superimposed portion 30 is formed by offsetting it in the thickness direction of the power generation element 10 towards the negative side in the z-axis direction from the center of the power generation element 10. In addition, in the battery 2d, the laminate film 21b below the power generation element 10 is parallel to the main surface 16 of the power generation element 10 as a whole.

[0143] In forming the battery 2d, a cup-shaped laminate film 21a may be used, which has a recess pre-formed in the area that overlaps with the power generation element 10 in a plan view. This reduces the stress on the corners of the power generation element 10 where the laminate film 21a would bend significantly during sealing, thereby suppressing damage to the power generation element 10 or the laminate film 21a and reducing the risk of short circuits. Using a cup-shaped laminate film with a recess formed in the outer casing 20 is particularly effective when the thickness of the power generation element 10 is large, and may be applied to a stacked battery such as a power generation element 10a. Furthermore, even when the overlapping portion 30 is located at the center in the thickness direction of the power generation element 10, as in the battery 2a described above, cup-shaped laminate films may be used as laminate films 21a and 21b.

[0144] By forming risers 31, 32, and 33 on the battery 2d and joining adjacent risers among the risers 31, 32, and 33, the battery 1b shown in Figures 15 and 16 is obtained. Figure 15 is a cross-sectional view of the battery 1b according to this modified example. Figure 16 is a side view of the battery 1b according to this modified example. The top view of the battery 1b is, for example, the same as the battery 1 shown in Figure 1. The top view of the battery 1b may also be the same as the battery 1a shown in Figure 13.

[0145] As shown in Figures 15 and 16, battery 1b differs from battery 1 in Embodiment 1 in the position of the overlapping portion 30 in the thickness direction of the power generation element 10. In battery 1b, the portion of the overlapping portion 30 adjacent to the power generation element 10 is offset to the negative z-axis side, which is one side from the center of the power generation element 10, in the thickness direction of the power generation element 10. In addition, the rising portions 31, 32 and 33 rise toward the positive z-axis side, which is the other side in the thickness direction of the power generation element 10.

[0146] In the examples shown in Figures 15 and 16, the height of the rising portions 31, 32, and 33 is lower than the height of the battery 1 at the location where the power generation element 10 is located in a plan view. This reduces the volume occupied by the battery 1b in the thickness direction. Furthermore, since the overlapping portion 30 is offset from the center of the power generation element 10 in the thickness direction, the height of the rising portions 31, 32, and 33 can be secured while suppressing an increase in the volume occupied by the battery 1b in the thickness direction.

[0147] Furthermore, as shown in Figure 17, in battery 1b, the rising portions 31, 32, and 33 may rise to a position higher than the height of battery 1 where the power generation element 10 is located in a plan view. Figure 17 is a side view showing another example of the height of the rising portion 32. In Figure 17, only the rising portion 32 is shown, but the rising portions 31 and 33 also rise to the same height as the rising portion 32. This allows the rising portions 31, 32, and 33 to protect the power generation element 10 from impacts from both sides in the height direction. In particular, if the thickness of the power generation element 10 is large, the entire power generation element 10 can be effectively protected.

[0148] In addition, in the batteries according to each of the modified examples and embodiments described below, the superimposed portion 30 may be provided offset from the center in the thickness direction of the power generation element 10, as in battery 1b, or it may be provided at the center in the thickness direction of the power generation element 10, as in battery 1.

[0149] [Difference 3] Next, a battery according to modification 3 of Embodiment 1 will be described. In the following, the differences between Embodiment 1 and its various modifications will be explained, and the explanation of common points will be omitted or simplified.

[0150] In the manufacturing of the battery according to this modified example, the formation of the rising portions 31, 32, and 33 (step S40 above) differs from Embodiment 1 in that a notch is formed in the overlapping portion 30 before the end of the overlapping portion 30 is raised. Figure 18 is a top view of the battery 2e in the process of manufacturing according to this modified example. As shown in Figure 18, a notch 35 is formed at the corner of the overlapping portion 30 in a plan view of the battery 2a shown in Figure 10 above. In the example shown in Figure 18, the notch 35 extends from the corner of the overlapping portion 30 (points C and F in Figure 18) toward the power generation element 10 in a plan view. Note that the notch 35 does not need to extend from the corner of the overlapping portion 30 toward the power generation element 10 in a plan view; for example, it may extend inward from the outer circumference of the overlapping portion 30 near the corner of the overlapping portion 30.

[0151] Then, the overlapping portion 30 is folded along the dashed line shown in Figure 18 to form the rising portions 31, 32, and 33. Specifically, the region ABCD in Figure 18 is raised to form the rising portion 31. The region BCFE in Figure 18 is raised to form the rising portion 32. The region EFHG in Figure 18 is raised to form the rising portion 33. In this way, the rising portions 31, 32, and 33 are formed by raising the regions on both sides of the cut 35 in a plan view, with the cut 35 as the boundary. By raising the regions on both sides of the cut 35, the regions on both sides of the cut 35 do not interfere with each other when raising the end of the overlapping portion 30, making it easy to raise the end of the overlapping portion 30.

[0152] Subsequently, by joining two adjacent rising portions from among the rising portions 31, 32, and 33, the battery 1c shown in Figure 19 is obtained. Figure 19 is a top view of the battery 1c according to this modified example. In the battery 1c, two adjacent rising portions from among the rising portions 31, 32, and 33 have contact portions 42e and 42f that are joined by surface contact with each other. Contact portion 42e is the portion where the inner surface of rising portion 31 and the outer surface of rising portion 32 are in surface contact with each other. Contact portion 42f is the portion where the outer surface of rising portion 32 and the inner surface of rising portion 33 are in surface contact with each other. Since the contact portions 42e and 42f are formed without folding the corners of the overlapping portion 30, it is possible to suppress the reduction in the joining area between the rising portions due to folding. For example, the contact portions 42e and 42f can more easily have a larger surface contact area than the contact portions 42a, 42b, 42c, and 42d.

[0153] [Differentiation Example 4] Next, we will describe a battery according to modification 4 of Embodiment 1. In the following, we will focus on explaining the differences between Embodiment 1 and its various modifications, and will omit or simplify the explanation of the common points.

[0154] In the manufacturing of the battery according to this modified example, in the formation of the rising portions 31, 32, and 33 (step S40 above), a notch is formed in the overlapping portion 30 before the end of the overlapping portion 30 is raised, which differs from Embodiment 1. Figure 19 is a top view of the battery 2f in the process of manufacturing according to this modified example. As shown in Figure 19, a notch 36 is formed at the corner of the overlapping portion 30 in a plan view of the battery 2a shown in Figure 10 above. In the example shown in Figure 19, the notch 36 is formed at the two corners on the negative side in the y-axis direction.

[0155] Then, the overlapping portion 30 is folded along the dashed line shown in Figure 19 to form the rising portions 31, 32, and 33. Specifically, the region ABCD in Figure 19 is raised to form the rising portion 31. The region BGFE in Figure 19 is raised to form the rising portion 32. The region EJIH in Figure 19 is raised to form the rising portion 33. In this way, the region 31, 32, and 33 are formed by raising the regions on both sides of the notch 36 in a plan view, with the notch 36 as the boundary. By raising the regions on both sides of the notch 36, the regions on both sides of the notch 36 do not interfere with each other when raising the end of the overlapping portion 30, making it easy to raise the end of the overlapping portion 30.

[0156] Subsequently, two adjacent rising portions from among the rising portions 31, 32, and 33 are joined together to obtain the battery 1d shown in Figure 21. Figure 21 is a top view of the battery 1d according to this modified example. In the battery 1d, two adjacent rising portions from among the rising portions 31, 32, and 33 are joined together by contact at their tips in a direction perpendicular to their own thickness direction, for example, in a plan view. In the battery 1d, the adjacent rising portions 31 and 32, and the rising portions 32 and 33, do not overlap each other in their own thickness direction. This makes it possible to miniaturize and lighten the battery 1d. It also improves the stackability when arranging the batteries 1d side by side.

[0157] Depending on the shape of the notch 36, two adjacent rising portions among the rising portions 31, 32, and 33 may be joined in surface contact with each other.

[0158] (Embodiment 2) Next, a battery according to Embodiment 2 will be described. In the battery according to Embodiment 2, adjacent rising portions are joined together via a relay joining member. In the following, the differences between Embodiment 1 and its various modifications will be explained, and the explanation of common points will be omitted or simplified.

[0159] Figure 22 is a top view of battery 201 according to this embodiment. Figure 23 is a top view of another battery 201a according to this embodiment. As shown in Figures 22 and 23, batteries 201 and 201a according to this embodiment differ from battery 1d according to modification 4 of Embodiment 1 in that they further include a relay connecting member 60. The relay connecting member 60 is an example of an auxiliary material.

[0160] The relay connecting member 60 is attached to each of the adjacent rising portions 31 and 32, and rising portions 32 and 33. In batteries 201 and 201a, the adjacent rising portions 31 and 32, and rising portions 32 and 33 are joined via the relay connecting member 60. This allows the power generation element 10 to be protected by the relay connecting member 60 as well. In batteries 201 and 201a, the adjacent rising portions 31 and 32, and rising portions 32 and 33 may or may not be directly joined by heat fusion or the like.

[0161] Each intermediate connecting member 60 extends along the shape of the joint between adjacent rising portions 31 and 32, or between rising portions 32 and 33. In the example shown in Figures 22 and 23, the adjacent rising portions 31 and 32, and rising portions 32 and 33 are joined at the corners of the exterior body 20 in plan view, so the intermediate connecting member 60 is an L-shaped plate member in plan view.

[0162] As shown in Figure 22, in the battery 201, the intermediate connecting member 60 is positioned further from the power generation element 10 than the rising portions 31, 32, and 33, and the inner surface of the intermediate connecting member 60 is in contact with two adjacent rising portions among the rising portions 31, 32, and 33. In the battery 201, the intermediate connecting member 60 makes it easier to protect the power generation element 10 from external forces, and also allows for greater freedom in the shape and size of the intermediate connecting member 60.

[0163] Furthermore, as shown in Figure 23, in the battery 201a, the relay connecting member 60 is positioned closer to the power generation element 10 than the rising portions 31, 32, and 33, and the outer surface of the relay connecting member 60 is in contact with two adjacent rising portions among the rising portions 31, 32, and 33. In the battery 201a, the size of the battery 201a does not increase even with the provision of the relay connecting member 60, making it easy to miniaturize.

[0164] The rising portions 31, 32, and 33 are each joined to the intermediate joining member 60 by, for example, heat fusion or adhesive bonding. To improve the bonding between the intermediate joining member 60 and the rising portions 31, 32, and 33, the surface of the intermediate joining member 60 may have irregularities, or holes may be formed in the intermediate joining member 60.

[0165] The intermediate joint member 60 has higher rigidity than, for example, the outer casing 20. The material constituting the intermediate joint member 60 is, for example, a metal, ceramics, or resin, or a composite containing two or more of these.

[0166] In addition, while battery 1d according to the modified example 4 of Embodiment 1 further includes a relay connecting member 60, batteries 1, 1a, 1b, or 1c may also further include a relay connecting member 60.

[0167] [Example 1] Next, a battery according to Modification 1 of Embodiment 2 will be described. In the following, the descriptions will focus on the modifications of Embodiment 2 and Embodiment 1, as well as the differences from Embodiment 2, while the explanation of common points will be omitted or simplified.

[0168] Figure 24 is a top view of battery 201b according to this modified example. As shown in Figure 24, battery 201b according to this modified example differs from batteries 201 and 201a according to Embodiment 2 in that it further includes a fastening member 63 for attaching the relay connecting member 60. The fastening member 63 is an example of a crimping mechanism. In Figure 24, the invisible portion of the fastening member 63 is shown with a dashed line.

[0169] The battery 201b includes a pair of intermediate connecting members 60 that sandwich the joints of adjacent rising portions 31 and 32, and a pair of intermediate connecting members 60 that sandwich the joints of adjacent rising portions 32 and 33. Each pair of intermediate connecting members 60 is attached to adjacent rising portions 31 and 32, or rising portions 32 and 33, by a fastening member 63. As a result, adjacent rising portions 31 and 32, or rising portions 32 and 33, are joined to each other via the intermediate connecting members 60.

[0170] The fastening member 63 is, for example, a member that can be crimped using a rivet or the like. This allows the intermediate joining member 60 to be easily and securely attached to the rising portions 32 and 33.

[0171] The fastening member 63 may be a screw-fastened member such as a bolt and nut. Furthermore, the battery 201b may be provided with only one of the following: a relay connecting member 60 that is further from the power generation element 10 than the rising portions 31, 32, and 33, and a relay connecting member 60 that is closer to the power generation element 10 than the rising portions 31, 32, and 33.

[0172] (Embodiment 3) Next, the battery according to Embodiment 3 will be described. In the battery according to Embodiment 3, the overlapping portion where the leads are drawn out is raised. In the following, the differences from Embodiments 1 and 2 and their respective modifications will be explained, and the explanation of common points will be omitted or simplified.

[0173] Figure 25 is a top view of the battery 301 according to this embodiment. As shown in Figure 25, the battery 301 according to this embodiment differs from the battery 201 according to Embodiment 2 in that the superimposed portion 30 further includes a rising portion 34. In this embodiment, the rising portion 31 is an example of a first rising portion, and the rising portion 34 is an example of a second rising portion.

[0174] In the battery 301, the superimposed portion 30 includes raised portions 31, 32, 33, and 34, which are raised portions at the ends of the superimposed portion 30. Each of the raised portions 31, 32, 33, and 34 has an end of the superimposed portion 30 that is bent and rises toward the positive z-axis direction. In a plan view, the raised portions 31 and 33 extend along the y-axis direction, and the raised portions 32 and 34 extend along the x-axis direction. In a plan view, the raised portions 31 and 33 and the raised portions 32 and 34 extend in intersecting directions, specifically in orthogonal directions. In the battery 301, the raised portions 31, 32, 33, and 34 constitute the four sides of the rectangle of the outer casing 20 in a plan view. In the battery 301, in a plan view, the power generation element 10 is completely surrounded by the raised portions 31, 32, 33, and 34.

[0175] The rising portion 34 is located on the positive side in the y-axis direction of the power generation element 10 and faces the side surface 14 without passing through the power generation element 10. Although not shown, the angle θ at which the rising portion 34 inclins with respect to the main surfaces 15 and 16 of the power generation element 10 and the height at which it rises are the same as the angle θ and height at which it rises in the rising portions 31, 32, and 33 described in Embodiment 1 above.

[0176] The adjacent rising portions 31 and 34, and the rising portions 33 and 34, are joined to each other via a relay joining member 60.

[0177] In the battery 301, the electrode lead 91 and the counter electrode lead 92 are each drawn out from the casing 20 at the rising portion 34. Furthermore, the electrode lead 91 and the counter electrode lead 92 drawn out from the casing 20 at the rising portion 34 each extend toward the power generation element 10 side of the rising portion 34 in a plan view. In a plan view, the electrode lead 91 and the counter electrode lead 92 each overlap the casing 20 in their entirety.

[0178] In the example shown in Figure 25, the electrode lead 91 and the counter electrode lead 92 are both bent in their entirety beyond the sleeve 93 and extend toward the power generation element 10 in a plan view. The electrode lead 91 and the counter electrode lead 92 may also extend toward the opposite side of the power generation element 10 in a plan view.

[0179] Note that the method of leading out the electrode leads 91 and counter electrode leads 92 is not limited to the example shown in Figure 25. Figure 26 is a top view of another battery 301a according to this embodiment. As shown in Figure 26, in battery 301a, the end of the rising portion 34 in the direction of rising is further bent and extends toward the power generation element 10. Therefore, the electrode leads 91 and counter electrode leads 92 led out from the casing 20 in the rising portion 34 extend toward the power generation element 10 side of the rising portion 34 in a plan view without bending. In battery 301a, the electrode leads 91 and counter electrode leads 92 led out from the casing 20 in a plan view each overlap with the power generation element 10.

[0180] Battery 301 is manufactured, for example, from battery 302 in the process of being manufactured, as shown in Figure 27, and battery 301a is manufactured, for example, from battery 302a in the process of being manufactured, as shown in Figure 28. Figure 27 is a top view of battery 302 in the process of being manufactured according to this embodiment. Figure 28 is a top view of another battery 302a in the process of being manufactured according to this embodiment.

[0181] Batteries 302 and 302a are formed by adjusting the size of the overlapping portion 30 of battery 2f shown in Figure 20, and by further forming notches 36 at two corners on the positive side of the y-axis. In batteries 302 and 302a, the region KAHL is raised on the positive side of the z-axis to form a raised portion 34. Since the region KAHL of battery 302a is larger than that of battery 302, it is possible to further bend the raised end of the raised portion 34.

[0182] For example, batteries 301 and 301a allow for miniaturization of the wiring board. Figure 29 is a side view showing an example of a wiring board 180 on which battery 301a is mounted. In Figure 24, the shapes of the power generation element 10, electrode leads 91, counter leads 92, and sleeve 93 are shown by dashed lines. In the example shown in Figure 29, the battery 301a is mounted on the wiring board 180 with the main surfaces 15 and 16 parallel to the wiring board 180, and the electrode leads 91 and counter leads 92 drawn out from the casing 20 facing the side closer to the wiring board 180. By mounting battery 301a, which has a smaller projected area, the wiring board 180 can be miniaturized. In addition, electronic components 182 that receive power from battery 301a are mounted on the wiring board 180.

[0183] The electrode leads 91 and counter electrode leads 92 are joined to the wiring board 180 via a bonding member 181 such as solder. Furthermore, at least one of the rising portions 31, 32, 33, and 34 may also be joined to the wiring board 180. This further improves the mechanical reliability of the battery 301a. Additionally, the distance between the electronic components 182 mounted on the wiring board 180 and the battery 301a can be shortened, which is advantageous for forming high-frequency circuits.

[0184] In addition, in batteries 301 and 301a, the superimposed portion 30 of battery 201 according to Embodiment 2 further includes a rising portion 34, but the superimposed portion 30 of batteries 1, 1a, 1b, 1c, 1d, 201a, or 201b may further include a rising portion 34.

[0185] (Other embodiments) Although one or more embodiments of batteries and methods for manufacturing batteries have been described above based on embodiments and modifications, this disclosure is not limited to these embodiments. Within the scope of this disclosure, various modifications that a person skilled in the art could conceive of are applied to these embodiments and modifications, as well as forms constructed by combining components from different embodiments and modifications, are also included without departing from the spirit of this disclosure.

[0186] For example, in the above embodiment, the power generation element 10 was an all-solid-state battery, but it is not limited to this. The power generation element 10 may also be a liquid battery containing an electrolyte and a separator.

[0187] Furthermore, each of the above embodiments can be modified, replaced, added, or omitted in various ways within the scope of the claims or their equivalents. [Industrial applicability]

[0188] The battery described herein can be used as a battery for various applications such as electronic devices, electrical appliances, and electric vehicles. [Explanation of Symbols]

[0189] 1, 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 2e, 2f, 201, 201a, 201b, 301, 301a, 302, 302a batteries 10, 10a power generation element 11, 12, 13, 14 Side view 15, 16 Main surface 20 Exterior 21a, 21b Laminating film 30 Overlapping portion 31, 32, 33, 34 Rising section 35 cuts 36 Notches 41a, 41b, 41c Non-contact parts 42a, 42b, 42c, 42d, 42e, 42f contact part 60 Intermediate joint member 63 Fastening Member 91 Electrode Leads 92 Opposite Lead 93 sleeves 100 battery cells 100a, 100b, 100c unit cells 110 Electrode layer 120 Counterpolar layer 130 Electrolyte layer 140 Electrode current collector 150 Counter-electrode current collector 160 Bipolar Current Collector 180 Wiring board 181 Joining member 182 Electronic Components

Claims

1. Power generation elements, An outer casing made of laminate film that seals the power generation element, Equipped with, The exterior body is, In a plan view with respect to the main surface of the power generation element, the laminate film is positioned to surround the power generation element and has an overlapping portion where the laminate film is superimposed. The aforementioned superimposed portion is In the plan view, the end of the overlapping portion located on the first direction side of the power generation element is a first rising portion, The plan view includes a second rising portion, which is a rising end of the overlapping portion on the second direction side that intersects the first direction of the power generation element, The first rising portion and the second rising portion are joined to each other. battery.

2. The power generation element is sealed under reduced pressure within the outer casing. The battery according to claim 1.

3. In the overlapping portion, the overlapping laminate films are heat-fused together. The battery according to claim 1.

4. The first rising portion and the second rising portion are joined by heat fusion. The battery according to claim 1.

5. At least one of the first rising portion and the second rising portion rises to a position higher than the height of the battery at the location where the power generation element is located in the plan view. The battery according to claim 1.

6. The first rising portion and the second rising portion have a contact portion that is joined to each other by surface contact and a non-contact portion that is not in contact with each other. The contact portion is provided at a position closer to the power generation element than the non-contact portion. The battery according to claim 1.

7. The first rising portion and the second rising portion have a contact portion that is joined to each other by surface contact and a non-contact portion that is not in contact with each other. The contact portion is provided at a position further from the power generation element than the non-contact portion. The battery according to claim 1.

8. The first rising portion and the second rising portion have a contact portion that is joined to each other by surface contact and a non-contact portion that is not in contact with each other. The contact portion is joined to the non-contact portion. The battery according to claim 1.

9. In the plan view, the first rising portion and the second rising portion are joined to each other at their tips in a direction perpendicular to their own thickness direction. The battery according to claim 1.

10. The system further comprises auxiliary members attached to the first rising portion and the second rising portion, The first rising portion and the second rising portion are joined together via the auxiliary material. The battery according to claim 1.

11. The auxiliary material is attached to the first rising portion and the second rising portion by a crimping mechanism. The battery according to claim 10.

12. The superimposed portion is provided offset to one side from the center of the power generation element in the thickness direction of the power generation element. The first rising portion and the second rising portion rise toward the other side in the thickness direction of the power generation element. The battery according to any one of claims 1 to 11.

13. The aforementioned power generation element is an all-solid-state battery. The battery according to any one of claims 1 to 11.

14. The first rising portion and the second rising portion are inclined at an angle of 45° or more with respect to the main surface of the power generation element. The battery according to any one of claims 1 to 11.

15. The system further comprises leads connected to the power generation element, with a portion of them located within the outer casing, The lead is pulled out from the outer casing at the second rising portion, The entire lead overlaps with the outer casing in the plan view. The battery according to any one of claims 1 to 11.

16. The steps include: covering the power generation element with a laminate film, and sealing the power generation element with an outer casing made of the laminate film by overlapping the laminate film at a position that surrounds the power generation element in a plan view with respect to the main surface of the power generation element; The steps include: raising the end of the overlapping portion to form a first raised portion where the end of the overlapping portion located on the first direction side of the power generation element in the plan view is raised, and a second raised portion where the end of the overlapping portion on the second direction side intersecting the first direction of the power generation element in the plan view is raised; The steps include joining the first rising portion and the second rising portion, including, Battery manufacturing method.

17. In the step of sealing the power generation element, the overlapping laminate films of the overlapping portions are heat-fused together to seal the power generation element with the outer casing. The method for manufacturing a battery according to claim 16.

18. The aforementioned power generation element is an all-solid-state battery. The method for manufacturing a battery according to claim 16.

19. In the step of forming the first rising portion and the second rising portion, before raising the end of the overlapping portion, a cut is made in the overlapping portion, and the first rising portion and the second rising portion are formed by raising both sides of the cut. A method for manufacturing a battery according to any one of claims 16 to 18.

20. In the step of forming the first rising portion and the second rising portion, before raising the end of the overlapping portion, a notch is formed in the overlapping portion, and the first rising portion and the second rising portion are formed by raising both sides of the notch. A method for manufacturing a battery according to any one of claims 16 to 18.

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