battery

Abstract

A battery of the present disclosure is provided with a power generating element including a first electrode including a first current collector and a first active material layer between the first current collector and an electrolyte layer, a second electrode, and the electrolyte layer between the first electrode and the second electrode, and a first lead-out electrode including a first conductive member connected to the first current collector on a first surface opposite to the first active material layer and a first lead wire connected to the first conductive member.

Description

Technical Field

[0001] This disclosure relates to batteries. Background Technology

[0002] Patent documents 1 and 2 disclose batteries with current collector terminals.

[0003] Prior art literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2010-140703

[0005] Patent Document 2: International Publication No. 2018 / 025649 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Seeking to improve battery reliability.

[0008] Methods for solving problems

[0009] One technical solution disclosed herein relates to a battery comprising a power generation element and a first lead electrode. The power generation element includes a first electrode, a second electrode, and an electrolyte layer located between the first electrode and the second electrode. The first electrode includes a first current collector and a first active material layer located between the first current collector and the electrolyte layer. The first lead electrode includes a first conductive member and a first lead connected to the first conductive member. The first conductive member is connected to a first surface of the first current collector opposite to the first active material layer.

[0010] The effects of the invention

[0011] According to this disclosure, a highly reliable battery can be provided. Attached Figure Description

[0012] Figure 1 It is a three-dimensional diagram showing the structure of a conventional battery.

[0013] Figure 2 yes Figure 1 A cross-sectional view of the battery in line II-II.

[0014] Figure 3 These are top and cross-sectional views of the battery involved in Embodiment 1.

[0015] Figure 4 This is a flowchart illustrating the battery manufacturing method according to Embodiment 1.

[0016] Figure 5 These are top and cross-sectional views of the battery involved in Embodiment 2.

[0017] Figure 6This is a flowchart illustrating the battery manufacturing method according to Embodiment 2.

[0018] Figure 7 These are top and cross-sectional views of the battery involved in Embodiment 3.

[0019] Figure 8 These are top and cross-sectional views of the battery involved in Embodiment 4.

[0020] Figure 9 These are top and cross-sectional views of the battery involved in Embodiment 5.

[0021] Figure 10 These are top and cross-sectional views of the battery involved in Embodiment 6.

[0022] Figure 11 These are top and cross-sectional views of the battery according to Embodiment 7.

[0023] Figure 12 These are top and cross-sectional views of the battery involved in a variation of embodiment 7.

[0024] Figure 13 This is a top view of the lead-out electrode according to a variation of embodiment 1.

[0025] Figure 14 These are top and cross-sectional views of the lead-out electrode involved in Variation 2 of the implementation. Detailed Implementation

[0026] (The insights that form the basis of this disclosure)

[0027] The inventors discovered the following problems in conventional batteries.

[0028] Figure 1 This is a 3D diagram showing the structure of the conventional battery 1x. Figure 2 yes Figure 1 A cross-sectional view of battery 1x of the II-II line.

[0029] like Figure 1 and Figure 2 As shown, the conventional battery 1x is an all-solid-state battery comprising a positive electrode 11x, a negative electrode 14x, and a solid electrolyte layer 17x. The positive electrode 11x includes a positive current collector 12x and a positive active material layer 13x. The negative electrode 14x includes a negative current collector 15x and a negative active material layer 16x. The solid electrolyte layer 17x is disposed between the positive electrode 11x and the negative electrode 14x.

[0030] In previous Battery 1x models, such as Figure 1 and Figure 2As shown, a tab 18x is provided on the positive current collector 12x. Tab 18x is a part of the positive current collector 12x, and is the portion not covered by the positive active material layer 13x. A lead 22x is mounted on tab 18x. Similarly, a tab 19x is provided on the negative current collector 15x. Tab 19x is a part of the negative current collector 15x, and is the portion not covered by the negative active material layer 16x. A lead 32x is mounted on tab 19x. Leads 22x and 32x are the lead electrodes of battery 1x.

[0031] In the manufacture of battery 1x, a laminate comprising a positive electrode 11x, a solid electrolyte layer 17x, and a negative electrode 14x is compressed by pressing in the thickness direction (hereinafter referred to as bonding compression). By performing bonding compression, the density in each layer of the positive electrode active material layer 13x, the negative electrode active material layer 16x, and the solid electrolyte layer 17x can be increased, forming a good contact interface between particles.

[0032] During the bonding and pressing process, elongation occurs in each layer in a direction orthogonal to the compression direction. The strain caused by this elongation is most affected at the outer peripheral ends, which are the open ends of each layer. Therefore, the film thickness of each layer may differ between the central portion and the outer peripheral ends of battery 1x. In this case, the outer peripheral ends of battery 1x do not conform to the designed film thickness structure, thus becoming a part where the designed battery performance is not achieved. Therefore, this becomes one reason for the reduced reliability of the battery as a whole, including these outer peripheral ends.

[0033] As a countermeasure, the outer peripheral end is removed. That is, by cutting off the outer peripheral end that does not yield a film thickness structure as designed, a battery 1x with uniform characteristics throughout the entire surface can be achieved.

[0034] However, in Figure 1 and Figure 2 In the case of the battery 1x shown, the outer peripheral end must be cut off while leaving the tabs 18x and 19x intact. This requires very high cutting precision. Therefore, it is difficult to achieve a highly reliable battery 1x that cuts off the outer peripheral end while forming the tabs 18x and 19x.

[0035] As mentioned above, the previous Battery 1x had a problem that prevented improvements in reliability.

[0036] In contrast, one technical solution disclosed herein relates to a battery comprising a power generation element and a first lead electrode. The power generation element includes a first electrode, a second electrode, and an electrolyte layer located between the first electrode and the second electrode. The first electrode includes a first current collector and a first active material layer located between the first current collector and the electrolyte layer. The first lead electrode includes a first conductive member and a first lead connected to the first conductive member. The first conductive member is connected to a first surface of the first current collector opposite to the first active material layer.

[0037] In this way, the first lead is connected to the first current collector via the first conductive member, thereby allowing the first lead to be mounted on the first current collector after the outer peripheral end of the power generation element has been cut off. Therefore, high precision is not required for cutting the outer peripheral end, and the reliability of the power generation element's performance can be easily improved. Thus, according to this technical solution, a highly reliable battery can be provided.

[0038] Leads typically have a thickness of around 100 μm. When the leads are directly connected to the current collector, localized unevenness, roughly equivalent to the lead's thickness, is created at the connection point. In practical use, batteries are sometimes subjected to significant external constraint pressure. In such cases, if localized unevenness exists on the current collector, the constraint pressure on the battery will also deviate. This deviation in constraint pressure can potentially accelerate battery performance degradation locally, reducing battery reliability.

[0039] In contrast, one technical solution disclosed herein relates to a battery in which the first conductive member may have an area that does not overlap with the first current collector when viewed from above. The first lead may be connected to the first conductive member in said area.

[0040] Therefore, the first lead does not overlap with the first current collector, thereby suppressing deviations in the constraint pressure on the power generation element. This further improves the reliability of the battery.

[0041] Additionally, for example, the first conductive member may be in contact with the first surface of the first current collector.

[0042] This reduces the contact resistance between the first conductive component and the first current collector, thereby improving the battery extraction efficiency.

[0043] Additionally, for example, a battery according to one technical solution of this disclosure may further include a bonding layer located between the first current collector and the first conductive member. The first conductive member may be connected to the first surface of the first current collector via the bonding layer.

[0044] This improves the bonding strength between the first conductive member and the first current collector, thereby preventing the first conductive member and the first lead from detaching from the power generation element. Consequently, it enhances the reliability of the battery.

[0045] Additionally, the bonding layer may be conductive, for example.

[0046] This improves the fixing strength between the first conductive member and the first current collector, and also improves the extraction efficiency of the battery.

[0047] Additionally, for example, the first current collector and the first conductive member can be formed using the same material. That is, the first current collector and the first conductive member can contain the same material.

[0048] This improves the seal between the first conductive component and the first current collector, and further reduces their contact resistance. Consequently, it further improves the battery's extraction efficiency.

[0049] In addition, for example, the thickness of the conductive member can be greater than or equal to the thickness of the first current collector.

[0050] This improves the strength of the first conductive component, thus suppressing breakage. Therefore, it enhances the reliability of the battery.

[0051] Additionally, for example, a battery according to one of the technical solutions disclosed herein may also include an insulating layer arranged in a frame shape along the end face of the power generation element.

[0052] This can suppress short circuits between the positive and negative electrodes at the ends of the power generation element, thereby improving the reliability of the battery.

[0053] Additionally, for example, the insulating layer may also cover the end of the first surface of the first current collector.

[0054] Therefore, the outer periphery of the first conductive component can be protected by the insulating layer, thus improving the reliability of the battery.

[0055] Additionally, for example, the first conductive member can cover the entire first surface of the first current collector when viewed from above.

[0056] This maximizes the contact area between the first conductive component and the first current collector, thereby reducing the contact resistance between them. Consequently, the battery's extraction efficiency can be improved.

[0057] Alternatively, for example, it can be set that the further away the first conductive member is from the first lead, the smaller the thin-film resistance.

[0058] This allows for the suppression of localized electric field concentration, thereby inhibiting localized battery degradation and improving battery reliability.

[0059] Additionally, for example, the first conductive member may have multiple through holes. It can be configured that at least one of the arrangement density and opening area of ​​the multiple through holes decreases as it moves further away from the first lead.

[0060] Therefore, for example, local electric field concentration can be suppressed while maintaining a uniform thickness of the first conductive member. By making the thickness of the first conductive member uniform, deviations in the constraint pressure applied to the power generation element can be suppressed. Thus, the reliability of the battery can be further improved.

[0061] Alternatively, for example, the thickness of the first conductive member can be set to be greater the further away from the first lead.

[0062] Therefore, by varying the thickness of the first conductive member, localized electric field concentration can be easily suppressed. This improves the extraction efficiency of the battery.

[0063] Additionally, for example, a battery according to one technical solution of this disclosure may further include a second lead electrode. The second electrode may include a second current collector and a second active material layer located between the second current collector and the electrolyte layer. The second lead electrode may include a second conductive member and a second lead connected to the second conductive member, the second conductive member being connected to a second surface of the second current collector opposite to the second active material layer.

[0064] Thus, the second lead is connected to the second current collector via the second conductive member, allowing the second lead to be mounted on the second current collector after the outer peripheral end of the power generation element has been cut off. Therefore, high precision is not required for cutting the outer peripheral end, easily improving the reliability of the power generation element's performance. Therefore, according to this technical solution, a highly reliable battery can be provided.

[0065] Additionally, for example, the first conductive member may extend from the power generation element in a first direction when viewed from above. The second conductive member may extend from the power generation element in a second direction when viewed from above. The first lead may be connected to the extended portion of the first conductive member. The second lead may be connected to the extended portion of the second conductive member.

[0066] Therefore, the first and second conductive components do not overlap with the power generation element when viewed from above, thereby suppressing deviations in the constraint pressure on the power generation element. This further improves the reliability of the battery.

[0067] Alternatively, for example, the first direction and the second direction can be opposite directions.

[0068] This increases the distance between the first and second leads. Therefore, it helps to suppress short circuits and improve battery reliability.

[0069] Alternatively, for example, the first direction and the second direction can be the same direction.

[0070] This allows the first and second leads to be positioned closer together, making it suitable for applications with limited mounting space. For example, when mounting a battery on a substrate, the area required for the connection between the substrate and the battery can be reduced, thus increasing the flexibility in the layout of other circuit components and wiring mounted on the substrate.

[0071] Alternatively, for example, the first direction and the second direction can be orthogonal.

[0072] Therefore, the direction of the positive and negative terminals of the battery can be adjusted according to the requirements during installation.

[0073] Additionally, the electrolyte layer may, for example, contain a solid electrolyte that is lithium-ion conductive.

[0074] This enables the provision of highly reliable all-solid-state batteries.

[0075] Additionally, for example, a battery according to one of the technical solutions disclosed herein may include multiple power generation elements. The first lead electrode may be connected to the first current collector of a first power generation element, which is one of the multiple power generation elements. A second power generation element, which is one of the multiple power generation elements, may be stacked on the second electrode side of the first power generation element.

[0076] Therefore, the battery contains multiple power generation elements, thus enabling the creation of a battery with high output voltage and high battery capacity, and high reliability.

[0077] Alternatively, for example, the second electrode of the first power generation element can be connected to the first electrode of the second power generation element.

[0078] This allows for an increase in the voltage drawn from the battery.

[0079] Alternatively, for example, the second electrode of the first power generation element can be connected to the second electrode of the second power generation element.

[0080] This can increase battery capacity.

[0081] The embodiments will now be described in detail with reference to the accompanying drawings.

[0082] Furthermore, the embodiments described below are general or specific examples. The numerical values, shapes, materials, constituent elements, the arrangement and connection methods of the constituent elements, the steps, and the order of the steps shown in the following embodiments are merely examples and are not intended to limit this disclosure. In addition, constituent elements in the following embodiments that are not described in the independent claims are described as arbitrary constituent elements.

[0083] Furthermore, the drawings are not necessarily strictly representational. Therefore, the scales and other parameters may not be consistent across different drawings. Additionally, substantially identical structures are labeled with the same markings across different drawings, and repetitive descriptions are omitted or simplified.

[0084] Furthermore, in this specification, terms such as parallel or orthogonal indicating the correlation between elements, terms such as rectangle or circle indicating the shape of elements, and numerical ranges do not only have a strict meaning, but also indicate substantially equivalent ranges, such as a difference of a few percent.

[0085] In this specification and accompanying drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In various embodiments, the z-axis direction is used as the thickness direction of the battery. Furthermore, in this specification, "thickness direction" refers to the direction perpendicular to the surfaces of each layer. Sometimes, the positive side of the z-axis is treated only as "above" and "upper side," and the negative side of the z-axis is treated only as "below" and "lower side." For example, sometimes the surface of each layer of the battery with the positive z-axis is described as the "upper surface," and the surface with the negative z-axis is described as the "lower surface."

[0086] Additionally, in this specification, "top view" refers to viewing the battery along the stacking direction, and "thickness" refers to the length of the battery and each layer along the stacking direction.

[0087] In addition, in this specification, "inner" and "outer" in terms such as "inner side" and "outer side" refer to the inside and outside when observing the battery along the stacking direction of the battery.

[0088] Furthermore, in this specification, the terms "upper" and "lower" in the context of battery structure do not refer to the absolute spatial orientation of "up" (vertically above) and "lower" (vertically below), but rather are used as terms defined by relative positional relationships based on the stacking order in a layered structure. Additionally, the terms "above" and "below" apply not only to situations where two components are arranged with gaps between them and other components exist between them, but also to situations where two components are arranged close together and in contact.

[0089] (Implementation Method 1)

[0090] [Battery Overview]

[0091] First, using Figure 3 The battery involved in Embodiment 1 will be described.

[0092] Figure 3 These are top and cross-sectional views of the battery 1 according to this embodiment. Specifically, Figure 3 (a) is a top view of battery 1 viewed from the positive side of the z-axis. Figure 3 (b) shows Figure 3 (a) Section at the location shown by line IIIb-IIIb. Figure 3 (c) shows Figure 3 (a) The cross-section at the location shown by line IIIc-IIIc. Furthermore, Figure 3 The first lead 22, located on the inside of the cross-section, is omitted in (c). This is the same in the following figures.

[0093] like Figure 3 As shown, battery 1 includes a power generation element 10, a first lead electrode 20, a second lead electrode 30, and an insulating layer 40. Battery 1 is an all-solid-state battery.

[0094] The power generation element 10 includes a first electrode 11, a second electrode 14, and a solid electrolyte layer 17. The first electrode 11 includes a first current collector 12 and a first active material layer 13 disposed in contact with the first current collector 12. The second electrode 14 is the counter electrode of the first electrode 11. The second electrode 14 includes a second current collector 15 and a second active material layer 16 disposed in contact with the second current collector 15. The solid electrolyte layer 17 is an example of an electrolyte layer located between the first electrode 11 and the second electrode 14, and is in contact with the first active material layer 13 and the second active material layer 16, respectively.

[0095] The power generation element 10 is a laminate of a first electrode 11, a second electrode 14, and a solid electrolyte layer 17, with the outer peripheral ends cut off. That is, the power generation element 10 is obtained by bonding and pressing the laminated layers together, and then cutting off the outer peripheral ends that may cause film thickness deviations. Therefore, the power generation element 10 suppresses deviations in battery performance and improves reliability.

[0096] In this embodiment, the highly reliable power generation element 10, after its outer peripheral end is cut off, is connected with a first lead electrode 20 and a second lead electrode 30. Therefore, a highly reliable battery 1 is achieved.

[0097] The specific structures of the power generation element 10, the first lead-out electrode 20, and the second lead-out electrode 30 are described below.

[0098] [Power Generation Components]

[0099] First, the details of each component of the power generation element 10 will be explained.

[0100] In this embodiment, the first electrode 11 is the positive electrode, and the second electrode 14 is the negative electrode. That is, the first current collector 12 is the positive current collector, and the first active material layer 13 contains positive active material. The second current collector 15 is the negative current collector, and the second active material layer 16 contains negative active material.

[0101] Alternatively, the first electrode 11 can be configured as the negative electrode and the second electrode 14 as the positive electrode. That is, the first current collector 12 can be configured as the negative current collector, and the first active material layer 13 contains the negative active material. The second current collector 15 can be configured as the positive current collector, and the second active material layer 16 contains the positive active material.

[0102] The top view shapes of the first current collector 12, the first active material layer 13, the solid electrolyte layer 17, the second active material layer 16, and the second current collector 15 are all rectangular. There is no particular limitation on the top view shapes of the first current collector 12, the first active material layer 13, the solid electrolyte layer 17, the second active material layer 16, and the second current collector 15; they can also be shapes other than rectangles, such as circles, ellipses, or polygons.

[0103] In this embodiment, the first current collector 12, the first active material layer 13, the solid electrolyte layer 17, the second active material layer 16, and the second current collector 15 are all the same size and have the same outline when viewed from above, but this is not a limitation. For example, the first active material layer 13 may be smaller than the second active material layer 16. The first active material layer 13 and the second active material layer 16 may also be smaller than the solid electrolyte layer 17.

[0104] In this specification, without specifically distinguishing between the first current collector 12 and the second current collector 15, they are sometimes collectively referred to as "current collectors". Furthermore, there are no particular limitations as long as the current collector is formed of a conductive material.

[0105] As a current collector, for example, a foil, plate, or mesh made of stainless steel, nickel (Ni), aluminum (Al), iron (Fe), titanium (Ti), copper (Cu), palladium (Pd), gold (Au), or platinum (Pt), or an alloy of two or more of these, can be used. The material of the current collector can be appropriately selected considering the manufacturing process, its resistance to melting and decomposition under operating temperature and pressure, and the operating potential and conductivity of the battery applied to the current collector. Furthermore, the material of the current collector can also be selected based on the required tensile strength and heat resistance. For example, the current collector can be a high-strength electrolytic copper foil or a cladding material laminated with dissimilar metal foils. In this embodiment, the first current collector 12 contains aluminum as a main component. The second current collector 15 contains copper as a main component.

[0106] The thickness of the current collector is, for example, in the range of 10 μm or more and 100 μm or less. Furthermore, from the viewpoint of improving adhesion to the first active material layer 13 or the second active material layer 16, the surface of the current collector can be processed to have a rough, uneven surface. Alternatively, an adhesive component such as an organic adhesive can be coated onto the surface of the current collector. This strengthens the bonding at the interface between the current collector and other layers, thereby improving the mechanical and thermal reliability and cycle characteristics of the battery 1.

[0107] The first active material layer 13 is located between the first current collector 12 and the solid electrolyte layer 17. Specifically, the first active material layer 13 is configured to contact the main surface of the solid electrolyte layer 17 side of the first current collector 12. In this embodiment, the first active material layer 13 contains at least a positive electrode active material. That is, the first active material layer 13 is a layer that mainly contains a positive electrode material such as a positive electrode active material.

[0108] The positive electrode active material is a substance that undergoes oxidation or reduction by inserting or removing metal ions such as lithium (Li) or magnesium (Mg) ions into its crystal structure at a higher potential than that of the negative electrode. The type of positive electrode active material can be appropriately selected according to the type of battery 1, and well-known positive electrode active materials can be used.

[0109] Examples of positive electrode active materials include compounds containing lithium and transition metal elements, such as oxides containing lithium and transition metal elements, and phosphate compounds containing lithium and transition metal elements. For example, LiNi oxides can be used as oxides containing lithium and transition metal elements. x M 1-x Lithium-nickel composite oxides such as O2 (where M is at least one element selected from Co, Al, Mn, V, Cr, Mg, Ca, Ti, Zr, Nb, Mo, and W, and x is 0 < x ≤ 1), layered oxides such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), and lithium manganese oxide (LiMn2O4), or lithium manganese oxide with a spinel structure (e.g., LiMn2O4, Li2MnO3, LiMnO2), etc. Phosphoric acid compounds containing lithium and transition metal elements can be used, for example, lithium iron phosphate (LiFePO4) with an olivine structure. Furthermore, sulfides such as sulfur (S) and lithium sulfide (Li2S) can also be used as positive electrode active materials. In this case, a substance coated or added with lithium niobate (LiNbO3) or similar materials can be used as the positive electrode active material. Moreover, as a positive electrode active material, only one of these materials can be used, or two or more of these materials can be used in combination.

[0110] As described above, the first active material layer 13, which serves as the positive electrode active material layer, only needs to contain at least a positive electrode active material. The first active material layer 13 can be a mixture layer composed of a positive electrode active material and other additives. Other additives may include, for example, solid electrolytes such as inorganic solid electrolytes or sulfide-based solid electrolytes, conductive additives such as acetylene black, and adhesives such as polyethylene oxide or polyvinylidene fluoride. By mixing the positive electrode active material with other additives such as solid electrolytes in a predetermined ratio, the lithium-ion conductivity and electronic conductivity within the first active material layer 13 can be improved.

[0111] The thickness of the first active material layer 13 is, for example, in the range of 5 μm or more and 300 μm or less, but is not limited thereto.

[0112] The second active material layer 16 is located between the second current collector 15 and the solid electrolyte layer 17. Specifically, the second active material layer 16 is configured to contact the main surface of the solid electrolyte layer 17 side of the second current collector 15. In this embodiment, the second active material layer 16 at least contains a negative electrode active material. That is, the second active material layer 16 is a layer that mainly contains a negative electrode material such as a negative electrode active material.

[0113] The negative electrode active material is a substance that inserts or releases metal ions such as lithium (Li) or magnesium (Mg) ions into its crystal structure at a lower potential than that of the positive electrode, followed by oxidation or reduction. The type of negative electrode active material can be appropriately selected according to the type of battery 1, and known negative electrode active materials can be used.

[0114] As negative electrode active materials, carbon materials such as natural graphite, artificial graphite, graphite carbon fibers, or resin-sintered carbon, as well as alloying materials combined with solid electrolytes, can be used. As alloying materials, examples include LiAl, LiZn, Li3Bi, Li3Cd, Li3Sb, Li4Si, and Li... 4.4 Pb, Li 4.4 Sn, Li 0.17 Lithium alloys such as C or LiC6, lithium titanate (Li4Ti5O) 12 Lithium oxides of transition metals, zinc oxide (ZnO), or silicon oxide (SiO) x Metal oxides, etc. Furthermore, as negative electrode active materials, only one of these materials can be used, or two or more of these materials can be used in combination.

[0115] As described above, the second active material layer 16, which serves as the negative electrode active material layer, only needs to contain at least the negative electrode active material. The second active material layer 16 can be a mixture layer composed of the negative electrode active material and other additives. Other additives may include, for example, solid electrolytes such as inorganic solid electrolytes or sulfide-based solid electrolytes, conductive additives such as acetylene black, and adhesives such as polyethylene oxide or polyvinylidene fluoride. By mixing the negative electrode active material and other additives such as solid electrolytes in a predetermined ratio, the lithium-ion conductivity and electronic conductivity within the second active material layer 16 can be improved.

[0116] The thickness of the second active material layer 16 is, for example, in the range of 5 μm or more and 300 μm or less, but is not limited thereto.

[0117] A solid electrolyte layer 17 is disposed between and in contact with the first active material layer 13 and the second active material layer 16, respectively. The solid electrolyte layer 17 contains at least a solid electrolyte. For example, the solid electrolyte layer 17 contains a solid electrolyte as a main component.

[0118] Solid electrolytes can be any known battery-grade solid electrolyte with ionic conductivity. Examples of solid electrolytes that conduct lithium ions or magnesium ions are suitable. The type of solid electrolyte can be selected appropriately based on the type of ions it conducts.

[0119] Solid electrolytes can be inorganic solid electrolytes such as sulfide-based solid electrolytes or oxide-based solid electrolytes. As sulfide-based solid electrolytes, lithium-containing sulfides such as Li₂S-P₂S₅, Li₂S-SiS₂, Li₂S-B₂S₃, Li₂S-GeS₂, Li₂S-SiS₂-LiI, Li₂S-SiS₂-Li₃PO₄, Li₂S-Ge₂S₂, Li₂S-GeS₂-P₂S₅, or Li₂S-GeS₂-ZnS can be used. As oxide-based solid electrolytes, lithium-containing metal oxides such as Li₂O-SiO₂ or Li₂O-SiO₂-P₂O₅ can be used. x P y O 1-z N z Lithium-containing metal nitrides, lithium phosphate (Li3PO4), and lithium titanium oxide, etc., are examples of lithium-containing transition metal oxides. As a solid electrolyte, only one of these materials may be used, or two or more of these materials may be used in combination. In this embodiment, as an example, the solid electrolyte layer 17 contains a solid electrolyte with lithium-ion conductivity.

[0120] In addition to the solid electrolyte material mentioned above, the solid electrolyte layer 17 may also contain adhesives such as polyethylene oxide or polyvinylidene fluoride.

[0121] The thickness of the solid electrolyte layer 17 is, for example, in the range of 5 μm or more and 150 μm or less, but is not limited thereto.

[0122] Furthermore, the material of a solid electrolyte can be configured as a condensed mass of particles. Alternatively, the material of a solid electrolyte can also be composed of a sintered structure.

[0123] [First lead-out electrode and second lead-out electrode]

[0124] Next, the details of the first lead-out electrode 20 and the second lead-out electrode 30 will be explained.

[0125] like Figure 3 As shown, the first lead electrode 20 includes a first conductive member 21 and a first lead 22. The second lead electrode 30 includes a second conductive member 31 and a second lead 32.

[0126] The first conductive member 21 is connected to the main surface 12a of the first current collector 12. The main surface 12a is the first surface of the first current collector 12 opposite to the first active material layer 13. In this embodiment, as... Figure 3 As shown in (b) and (c), the first conductive member 21 is in contact with the main surface 12a of the first current collector 12. The first conductive member 21 and the first current collector 12 are in surface contact with each other in such a way that the contact area increases.

[0127] In this embodiment, the first conductive member 21 covers the entire main surface 12a of the first current collector 12 when viewed from above. Furthermore, the outline of the main surface 12a is consistent with... Figure 3 (a) shows the outline of the power generation element 10. The first conductive member 21 is larger than the first current collector 12 when viewed from above. The first conductive member 21 has a region 21a that does not overlap with the first current collector 12 when viewed from above.

[0128] The first conductive member 21 is a flat, conductive member. Specifically, the first conductive member 21 is a metal foil. Materials constituting the first conductive member 21 may include, for example, stainless steel, nickel, aluminum, iron, titanium, copper, palladium, gold, or platinum, or alloys of two or more of these. The first conductive member 21 may be formed using the same material as the first current collector 12. That is, the first conductive member 21 may contain the same material as the first current collector 12. For example, if the first current collector 12 is a metal foil containing aluminum as a main component, the first conductive member 21 may also contain aluminum as a main component.

[0129] The thickness of the first conductive member 21 is, for example, in the range of 10 μm or more and 100 μm or less. The thickness of the first conductive member 21 is greater than or equal to the thickness of the first current collector 12. For example, when the thickness of the first conductive member 21 is greater than the thickness of the first current collector 12, the strength of the first conductive member 21 can be improved.

[0130] The first lead 22 is connected to the first conductive member 21. Specifically, the first lead 22 is connected to the first conductive member 21 in region 21a. Region 21a is a part of the first conductive member 21, which is the portion extending from the power generating element 10 in a first direction when viewed from above. The first direction is specifically the negative direction of the x-axis. Region 21a is, for example, the portion of the first conductive member 21 that does not overlap with the second conductive member 31 when viewed from above. Figure 3 As shown in (b), the first lead 22 is connected to the main surface of the first conductive member 21, i.e., the main surface of the power generation element 10.

[0131] The first lead 22 is a metal such as copper, aluminum, nickel, or stainless steel, or a wire, foil, or plate-shaped component made of these metals after plating. The thickness of the first lead 22 is, for example, 100 μm. The first lead 22 is formed, for example, using the same material as the first conductive member 21. That is, the first lead 22 may contain the same material as the first conductive member 21. The first lead 22 is ultrasonically connected to the first conductive member 21, for example. The first lead 22 and the first conductive member 21 can also be connected using a conductive adhesive such as solder.

[0132] The first lead 22 is longer in one direction. In this embodiment, as... Figure 3 As shown in (a), the top view of the first lead 22 is that it is a rectangle that is longer in the y-axis direction. The first lead 22 extends in the positive y-axis direction relative to the first conductive member 21. The front end portion of the first lead 22 in the extending direction extends from the laminate (not shown) that seals the battery 1 substantially entirely, and is used for electrical and physical connection with other substrates, etc.

[0133] The second conductive member 31 is connected to the main surface 15a of the second current collector 15. The main surface 15a is the second surface of the second current collector 15 opposite to the second active material layer 16. In this embodiment, as... Figure 3 As shown in (b) and (c), the second conductive member 31 is in contact with the main surface 15a of the second current collector 15. The second conductive member 31 and the second current collector 15 are in surface contact with each other in such a way that the contact area increases.

[0134] In this embodiment, the second conductive member 31 covers the entire main surface 15a of the second current collector 15 when viewed from above. Furthermore, the outline of the main surface 15a is consistent with... Figure 3(a) shows the outline of the power generation element 10. The second conductive member 31 is larger than the second current collector 15 when viewed from above. The second conductive member 31 has a region 31a that does not overlap with the second current collector 15 when viewed from above.

[0135] The second conductive member 31 is a flat, conductive member. Specifically, the second conductive member 31 is a metal foil. Materials constituting the second conductive member 31 may include, for example, stainless steel, nickel, aluminum, iron, titanium, copper, palladium, gold, or platinum, or alloys of two or more of these. The second conductive member 31 may be formed using the same material as the second current collector 15. That is, the second conductive member 31 may contain the same material as the second current collector 15. For example, if the second current collector 15 is a metal foil containing copper as a main component, the second conductive member 31 may also contain copper as a main component.

[0136] The thickness of the second conductive member 31 is, for example, in the range of 10 μm or more and 100 μm or less. The thickness of the second conductive member 31 is greater than or equal to the thickness of the second current collector 15. For example, when the thickness of the second conductive member 31 is greater than the thickness of the second current collector 15, the strength of the second conductive member 31 can be improved.

[0137] The second lead 32 is connected to the second conductive member 31. Specifically, the second lead 32 is connected to the second conductive member 31 in region 31a. Region 31a is a part of the second conductive member 31, which is the portion extending from the power generating element 10 in a second direction when viewed from above. The second direction is specifically the positive direction of the x-axis. That is, in this embodiment, the first direction and the second direction are opposite. Region 31a is, for example, the portion of the second conductive member 31 that does not overlap with the first conductive member 21 when viewed from above. Figure 3 As shown in (b), the second lead 32 is connected to the main surface of the second conductive member 31, i.e., the main surface of the power generation element 10.

[0138] The second lead 32 is a metal such as copper, aluminum, nickel, or stainless steel, or a wire, foil, or plate-shaped component made of these metals after plating. The thickness of the second lead 32 is, for example, 100 μm. The second lead 32 is formed, for example, using the same material as the second conductive member 31. That is, the second lead 32 may contain the same material as the second conductive member 31. The second lead 32 is ultrasonically connected to the second conductive member 31, for example. The second lead 32 and the second conductive member 31 can also be connected using a conductive adhesive such as solder.

[0139] The second lead 32 is longer in one direction. In this embodiment, as... Figure 3As shown in (a), the top view of the second lead 32 is that of a rectangle that is longer in the y-axis direction. The second lead 32 extends in the positive y-axis direction relative to the second conductive member 31. In this embodiment, the extension direction of the second lead 32 is the same as the extension direction of the first lead 22. The front end portion of the second lead 32 in the extension direction extends from the laminate (not shown) that substantially seals the battery 1 as a whole, and is used for electrical and physical connection with other substrates, etc.

[0140] like Figure 3 As shown in (a), the first lead 22 and the second lead 32 are arranged such that the power generation element 10 is sandwiched between them when viewed from above. That is, when viewed from above, the power generation element 10 is located between the first lead 22 and the second lead 32. The first conductive member 21 and the second conductive member 31 are rectangles of the same size when viewed from above, and are staggered in the length direction. The power generation element 10 and the insulating layer 40 are located at the overlapping portion of the first conductive member 21 and the second conductive member 31.

[0141] In this embodiment, the connection between the first lead electrode 20 and the power generation unit 10, and the connection between the second lead electrode 30 and the power generation unit 10, are maintained by a laminating component (not shown) that seals the battery 1. The laminating component is a sealing component for the purpose of protecting the battery 1, and is formed using a metal or resin material. Except for the front end portions of the first lead 22 and the second lead 32, the entire battery 1 is vacuum-sealed by the laminating component.

[0142] By creating a vacuum inside the laminated component, atmospheric pressure can exert a thickness-direction constraint force on the power generation element 10 of the battery 1 via the laminated component. Through this constraint force, the first conductive member 21 is sealed to the first current collector 12, and the second conductive member 31 is sealed to the second current collector 15. This reduces the contact resistance between the first conductive member 21 and the first current collector 12, and between the second conductive member 31 and the second current collector 15. Furthermore, the constraint force of the laminated component helps suppress positional shifts between the first conductive member 21 and the first current collector 12, and between the second conductive member 31 and the second current collector 15.

[0143] [Insulating layer]

[0144] The insulating layer 40 is a frame-shaped insulating layer that runs along the end face of the power generation element 10. The insulating layer 40 covers the entire periphery of the power generation element 10 when viewed from above, in a manner that does not expose the end face of the power generation element 10.

[0145] The insulating layer 40 is formed using commonly known battery sealing materials such as sealants. For example, the insulating layer 40 is formed using an insulating resin material. Epoxy resin, acrylic resin, or polyimide resin are used as insulating resin materials.

[0146] The width of the insulating layer 40 may be, for example, several μm or more, but is not limited to this.

[0147] [Manufacturing Method]

[0148] Next, using Figure 4 The manufacturing method of the battery 1 according to this embodiment will be described. Figure 4 This is a flowchart illustrating the manufacturing method of battery 1 according to this embodiment.

[0149] like Figure 4 As shown, firstly, a laminate having the same structure as the power generation element 10 is formed (S10). The laminate is the power generation element 10 before bonding and pressing and cutting off the outer peripheral ends, and includes a first electrode 11, a solid electrolyte layer 17, and a second electrode 14 before bonding and pressing and cutting off the outer peripheral ends. As a method for forming the laminate, a known method for forming power generation elements can be used.

[0150] Next, the formed laminate is bonded and pressed (S12). This allows the designed battery characteristics to be achieved in the central portion of the laminate. After bonding and pressing, the outer peripheral ends of the laminate are cut off (S14). This results in the formation of a power generation element 10 with minimal in-plane battery performance deviation and high reliability.

[0151] Next, an insulating layer 40 is formed (S16). For example, a resin material is applied and cured in such a way that it covers the entire end face of the power generation element 10 along the outer periphery of the power generation element 10, thereby forming the insulating layer 40.

[0152] Next, a first lead-out electrode 20 and a second lead-out electrode 30 are formed (S18). Specifically, the first lead-out electrode 20 is formed by ultrasonically connecting a first lead 22 to the end of the first conductive member 21. Similarly, the second lead-out electrode 30 is formed by ultrasonically connecting a second lead 32 to the end of the second conductive member 31.

[0153] Next, the first lead-out electrode 20 is connected to the first current collector 12, and the second lead-out electrode 30 is connected to the second current collector 15 (S20). For example, after aligning the first conductive member 21 with the first current collector 12 and the second conductive member 31 with the second current collector 15, the battery 1 is laminated and sealed. Thus, the first lead-out electrode 20 is connected to the first current collector 12, and the second lead-out electrode 30 is connected to the second current collector 15. Furthermore, during alignment, adhesive tape or the like can be used to temporarily fix each lead-out electrode and the power generation element 10. For example, the adhesive tape is attached from the outside of each of the first and second lead-out electrodes 20 to the insulating layer 40.

[0154] Alternatively, instead of temporary fixing, the lead-out electrode and current collector can be fixed by ultrasonic welding or spot welding. Furthermore, the connection between the first lead 22 and the second lead 32 can be performed during temporary fixing or after the lead-out electrode and current collector have been fixed.

[0155] Alternatively, the formation of the insulating layer 40 (S16) can be omitted. That is, the battery 1 may not have the insulating layer 40. In addition, the formation of the first lead electrode 20 and the second lead electrode 30 (S18) can be performed before the formation of the laminate (S10), or in parallel with the formation of the power generation element (S10 to S14).

[0156] As described above, in the battery 1 according to this embodiment, the first lead 22 is connected to the first current collector 12 via the first conductive member 21. Therefore, as Figure 4 As shown, after cutting off the outer peripheral end of the power generation element 10, the first lead 22 can be subsequently mounted on the first current collector 12. The same applies to the second lead 32 and the second current collector 15.

[0157] Therefore, the cutting of the outer peripheral end of the power generation element 10 does not require high precision, and the reliability of the power generation element 10 can be easily improved. Therefore, according to this embodiment, a highly reliable battery 1 can be provided.

[0158] Furthermore, since the first conductive member 21 and the second conductive member 31 respectively cover the entire surface of the power generation element 10, deviations in the final constraint pressure on the power generation unit 10 can be suppressed. Additionally, since the insulating layer 40 covers the end face of the power generation element 10, short circuits between the first electrode 11 and the second electrode 14 can be suppressed.

[0159] (Implementation Method 2)

[0160] Next, the battery of Embodiment 2 will be described. The main difference between Embodiment 2 and Embodiment 1 is that the insulating layer covering the end face of the power generation element covers the end of the first surface of the first current collector and the end of the second surface of the second current collector. Hereinafter, the description will focus on the differences from Embodiment 1, and the description of the common points will be omitted or simplified.

[0161] Figure 5 These are top and cross-sectional views of the battery 101 according to this embodiment. Specifically, Figure 5 (a) is a top view of battery 101 viewed from the front side of the z-axis. Figure 5 (b) shows Figure 5 (a) The cross section at the position shown by the Vb-Vb line. Figure 5 (c) shows Figure 5 (a) The cross section at the position shown by the Vc-Vc line.

[0162] like Figure 5 As shown, the battery 101 includes a power generation element 10, a first lead electrode 120, a second lead electrode 130, and an insulating layer 140. Since the power generation element 10 is the same as in Embodiment 1, its description is omitted.

[0163] The first lead electrode 120 includes a first conductive member 121 and a first lead 22. The second lead electrode 130 includes a second conductive member 131 and a second lead 32. The first lead 22 and the second lead 32 are the same as in Embodiment 1.

[0164] The first conductive member 121 is different in size from the first conductive member 21 involved in Embodiment 1. In this embodiment, the first conductive member 121 does not cover the entire main surface 12a of the first current collector 12, but only a portion of it. Figure 5 As shown, the first conductive member 121 exposes the outer peripheral end of the main surface 12a of the first current collector 12. Specifically, the top view of the main surface 12a of the first current collector 12 is rectangular, and the first conductive member 121 does not cover three sides of the main surface 12a, but only one side. That is, the three sides of the first conductive member 121 are located inside the three sides of the first current collector 12 when viewed from above.

[0165] The first conductive member 121 has a region 121a that does not overlap with the first current collector 12 when viewed from above. Region 121a is a part of the first conductive member 121 and is the portion that extends from the power generating element 10 in the negative x-axis direction when viewed from above. The first lead 22 is connected to region 121a.

[0166] The second conductive member 131 is different in size from the second conductive member 31 involved in Embodiment 1. In this embodiment, the second conductive member 131 does not cover the entire main surface 15a of the second current collector 15, but only a portion of it. Figure 5 As shown, the second conductive member 131 exposes the outer peripheral end of the main surface 15a of the second current collector 15. Specifically, the main surface 15a of the second current collector 15 has a rectangular shape when viewed from above, and the second conductive member 131 does not cover three sides of the main surface 15a, but only covers one side of the main surface 15a. That is, the three sides of the second conductive member 131 are located inside the three sides of the second current collector 15 when viewed from above.

[0167] The second conductive member 131 has a region 131a that does not overlap with the second current collector 15 when viewed from above. Region 131a is a part of the second conductive member 131 and is the portion that extends from the power generating element 10 in the positive x-axis direction when viewed from above. The second lead 32 is connected to region 131a.

[0168] The insulating layer 140, like the insulating layer 40 in Embodiment 1, is frame-shaped along the end face of the power generation element 10. The insulating layer 140 also covers the end of the main surface 12a of the first current collector 12. Specifically, the insulating layer 140 covers the portion of the main surface 12a of the first current collector 12 not covered by the first conductive member 121. For example, as... Figure 5 As shown in (b) and (c), the insulating layer 140 is disposed along the end face of the first conductive member 121. The insulating layer 140 is in contact with the end face of the first conductive member 121. The upper surface of the insulating layer 140 and the upper surface of the first conductive member 121 are on the same plane. In addition, the end face of the insulating layer 140 and the first conductive member 121 can be separated.

[0169] Additionally, the insulating layer 140 also covers the end of the main surface 15a of the second current collector 15. Specifically, the insulating layer 140 covers the portion of the main surface 15a of the second current collector 15 that is not covered by the second conductive member 131. For example, as Figure 5 As shown in (b) and (c), the insulating layer 140 is disposed along the end face of the second conductive member 131. The insulating layer 140 is in contact with the end of the second conductive member 131. The lower surface of the insulating layer 140 and the lower surface of the second conductive member 131 are on the same plane. In addition, the end faces of the insulating layer 140 and the second conductive member 131 can be separated.

[0170] The manufacturing method of battery 101 is different from the manufacturing method of battery 1 in Embodiment 1. Figure 6 This is a flowchart illustrating the manufacturing method of the battery 101 according to this embodiment.

[0171] like Figure 6 As shown, the steps (S10-S14) for forming the power generation element 10 are the same as the manufacturing method of the battery 1 according to Embodiment 1. In this embodiment, after forming the power generation element 10 by cutting off the outer peripheral end of the laminate, the first lead electrode 120 and the second lead electrode 130 are formed (S18). Then, the first lead electrode 120 is connected to the first current collector 12, and the second lead electrode 130 is connected to the second current collector 15 (S20). That is, the connection between the first lead electrode 120 and the second lead electrode 130 and the power generation unit 10 is performed before the insulating layer 140 is formed. In addition, if lamination sealing is performed, the insulating layer 140 cannot be formed; therefore, the connection in step S20 is for positioning alignment and temporary fixation.

[0172] After aligning the lead-out electrodes and current collectors, an insulating layer 140 is formed to cover the end face of the power generation element 10 and the outer peripheral ends of its upper and lower surfaces (S16). Specifically, for example, a resin material is applied and cured to cover the entire end of the power generation element 10 along its outer periphery, as well as the exposed portion of the main surface 12a of the first current collector 12 and the exposed portion of the main surface 15a of the second current collector 15, thereby forming the insulating layer 140.

[0173] Thus, by forming the insulating layer 140 after connecting the first lead electrode 120 and the second lead electrode 130 to the first current collector 12 and the second current collector 15, it is difficult to form unevenness above and below the power generation element 10. Specifically, the upper surface of the first conductive member 121 can be made to be coplanar with the upper surface of the insulating layer 140, and the lower surface of the second conductive member 131 can be made to be coplanar with the lower surface of the insulating layer 140. As a result, the constraint pressure after lamination and sealing can be easily and uniformly applied to the power generation element 10.

[0174] Furthermore, in this embodiment, the first conductive member 121, except for the region 121a connecting the first lead 22, does not extend outward from the power generation element 10 when viewed from above. Therefore, when constraining pressure is applied to the power generation element 10, the protruding portion of the first conductive member 121 will not bend. The same applies to the second conductive member 131. Therefore, short circuits between the positive and negative electrodes can be suppressed.

[0175] (Implementation Method 3)

[0176] Next, the battery according to Embodiment 3 will be described. In Embodiment 3, the main difference is the connection position of the second lead compared to Embodiments 1 and 2. Hereinafter, the description will focus on the differences from Embodiments 1 and 2, omitting or simplifying the description of the commonalities.

[0177] Figure 7 These are top and cross-sectional views of the battery 201 according to this embodiment. Specifically, Figure 7 (a) is a top view of battery 201 viewed from the front side of the z-axis. Figure 7 (b) shows Figure 7 (a) Section at the position shown by line VIIb-VIIb. Figure 7 (c) shows Figure 7 (a) Section at the position shown by line VIIc-VIIc.

[0178] like Figure 7As shown, battery 201 includes a power generation element 10, a first lead electrode 220, a second lead electrode 230, an insulating layer 140, and a spacer 250. Since the power generation element 10 is the same as in Embodiments 1 and 2, its description is omitted. Although the insulating layer 140 has a different shape compared to Embodiment 2, it is substantially the same, and its description is also omitted.

[0179] like Figure 7 As shown, the first lead electrode 220 includes a first conductive member 121 and a first lead 22. The first conductive member 121 and the first lead 22 are the same as in Embodiment 2, except for the connection position of the first lead 22. Figure 7 As shown in (b), the first lead 22 is connected to the upper surface of the first conductive member 121. That is, the first lead 22 is arranged on the side opposite to the power generation element 10 with reference to the first conductive member 121.

[0180] The second lead electrode 230 includes a second conductive member 231 and a second lead 32. The second conductive member 231 extends in a different direction relative to the power generation element 10 when viewed from above, compared to the second conductive member 131 in Embodiment 2. Specifically, the second conductive member 231, like the first conductive member 121, extends from the power generation element 10 in the negative x-axis direction when viewed from above. That is, in this embodiment, the first direction as the extension direction of the first conductive member 121 and the second direction as the extension direction of the second conductive member 231 are the same direction. When viewed from above, the region 231a of the second conductive member 231 that does not overlap with the second current collector 15 overlaps with the region 121a of the first conductive member 121 that does not overlap with the first current collector 12. For example, the second conductive member 231 and the first conductive member 121 have the same shape and position when viewed from above.

[0181] The second lead 32 is the same as in embodiments 1 and 2, except for its connection position and extension direction. The second lead 32 is connected to the lower surface of the second conductive member 231. That is, the second lead 32 is positioned on the side opposite to the power generation element 10, with the second conductive member 231 as a reference. Furthermore, the second lead 32 extends in the negative direction of the y-axis. In this embodiment, the extension direction of the second lead 32 is opposite to the extension direction of the first lead 22. This ensures the distance between the second lead 32 and the first lead 22, suppressing short circuits caused by contact between the leads.

[0182] Furthermore, in this embodiment, a spacer 250 is provided in the portion sandwiched between region 121a of the first conductive member 121 and region 231a of the second conductive member 231. The spacer 250 is an insulating component. For example, the spacer 250 is formed using the same material as the insulating layer 140. That is, the spacer 250 may contain the same material as the insulating layer 140. Figure 7 In (b), the spacer 250 and the insulating layer 140 are disposed separately, but they can also be in contact. That is, the spacer 250 can also be integrally disposed with the insulating layer 140. By providing the spacer 250, it is possible to prevent a short circuit caused by contact between the region 121a of the first conductive member 121 and the region 231a of the second conductive member 231.

[0183] The manufacturing method of battery 201 and Figure 6 The manufacturing method of the battery 101 involved in Embodiment 2 is the same. The spacer 250 can be formed in the same process as the insulating layer 140. Alternatively, the battery 201 may not have the spacer 250.

[0184] (Implementation Method 4)

[0185] Next, the battery according to Embodiment 4 will be described. In Embodiment 4, the main difference is the position of the second lead, which differs from Embodiments 1 to 3. Hereinafter, the description will focus on the differences from Embodiments 1 to 3, omitting or simplifying the description of the commonalities.

[0186] Figure 8 These are top and cross-sectional views of the battery 301 according to this embodiment. Specifically, Figure 8 (a) is a top view of battery 301 viewed from the positive side of the z-axis. Figure 8 (b) shows Figure 8 (a) Section at the location shown by line VIIIb-VIIIb. Figure 8 (c) shows Figure 8 (a) Section at the position shown by line VIIIC-VIIIC.

[0187] like Figure 8 As shown, battery 301 includes a power generation element 10, a first lead electrode 120, a second lead electrode 330, and an insulating layer 140. Since the power generation element 10 is the same as in embodiments 1-3, its description is omitted. The insulating layer 140 is substantially the same as in embodiments 2 and 3, although its shape differs slightly, so its description is also omitted.

[0188] like Figure 8As shown, the second lead electrode 330 includes a second conductive member 331 and a second lead 332. The second conductive member 331 extends in a different direction relative to the power generation element 10 when viewed from above compared to the second conductive member 131 according to Embodiment 2. Specifically, the second conductive member 331 extends from the power generation element 10 in the positive direction of the y-axis when viewed from above. That is, the extension direction of the second conductive member 331, i.e., the second direction, is orthogonal to the extension direction of the first conductive member 121, i.e., the first direction. The extension direction of the second conductive member 331 is the same as the extension direction of the first lead 22. The second conductive member 331 has a region 331a that does not overlap with the second current collector 15. The second lead 332 is connected to the region 331a.

[0189] The second lead 332 is the same as the second lead 32 in embodiments 1 and 2, except for its connection position and extension direction. Figure 8 In the example shown in (a), the top view shape of the second lead 332 is a rectangle that is longer in the x-axis direction, but it is not limited to this. The second lead 332 may also be longer in the y-axis direction, just like the first lead 22. In this embodiment, the extension direction of the second lead 332 is the same as the extension direction of the first lead 22. Therefore, the second lead 332 and the first lead 22 can be extended close to each other.

[0190] Alternatively, the extension direction of the second conductive member 331 can also be opposite to the extension direction of the first lead 22. That is, the second conductive member 331 can also extend in the negative direction of the y-axis. In this case, the second lead 332 can extend in the negative direction of the y-axis, or in the positive or negative direction of the x-axis. In this way, the extension direction of the lead can be appropriately adjusted according to the installation position of the battery 301. In the battery 301 according to this embodiment, the degree of freedom in lead configuration can be improved.

[0191] The manufacturing method of battery 301 and Figure 6 The manufacturing method of the battery 101 involved in Embodiment 2 shown is the same.

[0192] (Implementation Method 5)

[0193] Next, the battery according to Embodiment 5 will be described. The main difference between Embodiment 5 and Embodiments 1-4 is that the first conductive member and the second conductive member are respectively connected to the current collector via adhesives. Hereinafter, the description will focus on the differences from Embodiments 1-4, omitting or simplifying the description of commonalities.

[0194] Figure 9 These are top and cross-sectional views of the battery 401 according to this embodiment. Specifically, Figure 9 (a) is a top view of battery 401 viewed from the positive side of the z-axis. Figure 9 (b) shows Figure 9 (a) Cross section at the position shown by line IXb-IXb. Figure 9 (c) shows Figure 9 (a) Cross section at the position shown by the IXc-IXc line.

[0195] like Figure 9 As shown, the battery 401 includes a power generation element 10, a first lead electrode 20, a second lead electrode 30, an insulating layer 40, a bonding layer 420, and a bonding layer 430. Since the power generation element 10, the first lead electrode 20, the second lead electrode 30, and the insulating layer 40 are the same as in Embodiment 1, their description is omitted.

[0196] The bonding layer 420 is located between the first current collector 12 and the first conductive member 21. The bonding layer 420 bonds the main surface 12a of the first current collector 12 to the first conductive member 21. That is, the first conductive member 21 is connected to the main surface 12a of the first current collector 12 via the bonding layer 420.

[0197] The adhesive layer 420 covers the entire main surface 12a. For example... Figure 9 As shown in (b) and (c), the bonding layer 420 also covers the upper surface of the insulating layer 40. Alternatively, the bonding layer 420 may only cover the main surface 12a and not the upper surface of the insulating layer 40. Alternatively, the bonding layer 420 may only cover a portion of the main surface 12a.

[0198] The bonding layer 420 is conductive. For example, the bonding layer 420 is formed using a conductive resin material. Alternatively, the bonding layer 420 may also be a solder layer. The bonding layer 420 may also be a conductive carbon ribbon.

[0199] The bonding layer 430 is located between the second current collector 15 and the second conductive member 31. The bonding layer 430 bonds the main surface 15a of the second current collector 15 to the second conductive member 31. That is, the second conductive member 31 is connected to the main surface 15a of the second current collector 15 via the bonding layer 430.

[0200] The bonding layer 430 covers the entire main surface 15a. (Example) Figure 9 As shown in (b) and (c), the bonding layer 430 also covers the lower surface of the insulating layer 40. Alternatively, the bonding layer 430 may only cover the main surface 15a and not the lower surface of the insulating layer 40. Alternatively, the bonding layer 430 may only cover a portion of the main surface 15a.

[0201] Bonding layer 430 is conductive. For example, bonding layer 430 is formed using a conductive resin material. Alternatively, bonding layer 430 may also be a solder layer. Bonding layer 430 may also be a conductive carbon ribbon. Bonding layer 430 may be formed from the same material as bonding layer 420, or it may be formed from a different material.

[0202] According to the battery 401 of this embodiment, the fixing strength between the conductive member and the current collector can be improved, thereby preventing the conductive member and the lead from detaching from the power generation element 10. Therefore, the reliability of the battery 401 can be improved.

[0203] The manufacturing method of battery 401 and Figure 4 The manufacturing method of the battery 1 involved in Embodiment 1 is the same. In the connection process (S20) of the first lead electrode 20 and the second lead electrode 30, after forming a bonding layer 420 on at least one of the main surface 12a of the first current collector 12 and the first conductive member 21, the first current collector 12 is connected to the first conductive member 21. Similarly, after forming a bonding layer 430 on at least one of the main surface 15a of the second current collector 15 and the second conductive member 31, the second current collector 15 is connected to the second conductive member 31.

[0204] Alternatively, the battery 401 may not have at least one of the bonding layers 420 and 430. For example, one of the first lead electrode 20 and the second lead electrode 30 may contact the first current collector 12 or the second current collector 15 in the same manner as in Embodiment 1, and be fixed by constraint pressure.

[0205] Alternatively, battery 401 may have a first lead electrode 120 instead of first lead electrode 20. Alternatively, battery 401 may have a second lead electrode 130, 230 or 330 instead of second lead electrode 30.

[0206] (Implementation Method 6)

[0207] Next, the battery according to Embodiment 6 will be described. The battery according to Embodiment 6 differs from that of Embodiments 1 to 5 mainly in that it has multiple power generation elements connected in series. Hereinafter, the description will focus on the differences from Embodiments 1 to 5, and the description of the common points will be omitted or simplified.

[0208] Figure 10 These are top and cross-sectional views of the battery 501 according to this embodiment. Specifically, Figure 10 (a) is a top view of battery 501 viewed from the positive side of the z-axis. Figure 10 (b) shows Figure 10 (a) The cross section at the position indicated by the Xb-Xb line. Figure 10 (c) shows that Figure 10 (a) The cross section at the position indicated by the Xc-Xc line.

[0209] like Figure 10As shown, the battery 501 includes multiple power generation elements 10, a first lead electrode 120, a second lead electrode 130, and an insulating layer 540. The first lead electrode 120 and the second lead electrode 130 are the same as in Embodiment 2, so their description is omitted.

[0210] Multiple power generation elements 10 are arranged along the thickness direction of each layer. Figure 10 In the example shown, three power generation elements 10 are stacked sequentially. Alternatively, the number of power generation elements 10 stacked can be two or more.

[0211] For example, among the multiple power generation elements 10, the power generation element 10 located at the top is designated as the first power generation element, and the power generation element 10 located in the middle is designated as the second power generation element. In this embodiment, the second electrode 14 of the first power generation element is connected to the first electrode 11 of the second power generation element. Thus, the first power generation element and the second power generation element are connected in series.

[0212] In this embodiment, multiple power generation elements 10 are connected in series and stacked sequentially with their current collectors in contact with each other. Specifically, the positive current collector of one power generation element 10 is connected to the negative current collector of another power generation element 10. Figure 10 As shown in (c), the upper surface of the first current collector 12 of a power generation element 10 is in contact with the lower surface of the second current collector 15 of the power generation element 10 located on the power generation element 10. Alternatively, a conductive component may be sandwiched between the upper surface of the first current collector 12 and the lower surface of the second current collector 15.

[0213] The first lead electrode 120 is connected to the main surface 12a of the first current collector 12 of the uppermost power generation element 10 among the plurality of power generation elements 10. The second lead electrode 130 is connected to the main surface 15a of the second current collector 15 of the lowermost power generation element 10 among the plurality of power generation elements 10.

[0214] The insulating layer 540, like the insulating layer 140 in Embodiment 2, is frame-shaped along the end face of the power generation element 10. In this embodiment, the insulating layer 540 is frame-shaped along the end faces of each of the plurality of power generation elements 10. Furthermore, the insulating layer 540 covers the end of the main surface 12a of the first current collector 12 of the uppermost power generation element 10. Additionally, the insulating layer 540 covers the end of the main surface 15a of the second current collector 15 of the lowermost power generation element 10.

[0215] As described above, the battery 501 according to this embodiment includes a plurality of power generation elements 10 connected in series, thus enabling the battery 501 to achieve high output voltage and high reliability.

[0216] The manufacturing method of battery 501 and Figure 6The manufacturing method of the battery 101 involved in Embodiment 2 is the same. After forming the power generation elements 10 in parallel or sequentially multiple times (S10 to S14), a plurality of power generation elements 10 are stacked. In addition, the cutting process (S14) can be performed on the stacked plurality of power generation elements 10 at the same time. The stacked plurality of power generation elements 10 with their outer peripheral ends cut off are respectively connected to the first lead electrode 120 and the second lead electrode 130 (S20). Then, an insulating layer 540 is formed in such a way that it covers the outer peripheral ends of the end faces of each plurality of power generation elements 10, the upper surface of the uppermost power generation element 10, and the lower surface of the lowermost power generation element 10 (S16).

[0217] Additionally, battery 501 may have a first lead electrode 20 instead of first lead electrode 120. Furthermore, battery 501 may have a second lead electrode 30, 230, or 330 instead of second lead electrode 130. Additionally, battery 501 may have at least one of bonding layers 420 and 430.

[0218] (Implementation Method 7)

[0219] Next, the battery according to Embodiment 7 will be described. The battery according to Embodiment 7 differs from Embodiments 1 to 6 mainly in that it has multiple power generation elements connected in parallel. Hereinafter, the description will focus on the differences from Embodiments 1 to 6, and the description of the commonalities will be omitted or simplified.

[0220] Figure 11 These are top and cross-sectional views of the battery 601 according to this embodiment. Specifically, Figure 11 (a) is a top view of battery 601 viewed from the positive side of the z-axis. Figure 11 (b) shows Figure 11 (a) Cross section at the position shown by the XIb-XIb line. Figure 11 (c) shows Figure 11 (a) Cross section at the position shown by the XIc-XIc line.

[0221] like Figure 11 As shown, the battery 601 includes multiple power generation elements 10, a first lead electrode 620, a second lead electrode 130, and an insulating layer 540. The second lead electrode 130 is the same as in Embodiment 2, so its description is omitted. The insulating layer 540 is substantially the same as in Embodiment 6, although it has a different shape, so its description is omitted.

[0222] Multiple power generation elements 10 are arranged along the thickness direction of each layer. Figure 11 In the example shown, two power generation elements 10 are stacked sequentially. Alternatively, the number of stacked power generation elements 10 can be three or more.

[0223] For example, among the multiple power generation elements 10, the power generation element 10 located in the upper section is designated as the first power generation element, and the power generation element 10 located in the lower section is designated as the second power generation element. In this embodiment, the second electrode 14 of the first power generation element is connected to the second electrode 14 of the second power generation element. Thus, the first power generation element and the second power generation element are electrically connected in parallel.

[0224] In this embodiment, multiple power generation elements 10 are stacked sequentially in parallel. That is, the positive current collectors of the multiple power generation elements 10 are connected to each other or the negative current collectors are connected to each other. In the case of two power generation elements 10, the uppermost and lowermost layers are electrodes of the same polarity. Therefore, as... Figure 11 As shown in (b) and (c), the first lead electrode 620 has two first conductive members 121 and 621.

[0225] Two first conductive members 121 and 621 are respectively connected to the main surface 12a of the first current collector 12 of each of the two power generation elements 10. Furthermore, the main surface 12a of the first current collector 12 of the upper power generation element 10 is the upper surface, and the main surface 12a of the first current collector 12 of the lower power generation element 10 is the lower surface. The two first conductive members 121 and 621 extend from the power generation unit 10 in the negative x-axis direction when viewed from above. A first lead 22 is connected between the two first conductive members 121 and 621. Alternatively, the first lead 22 may only be connected to the first conductive member 121, and the battery 601 may also have an additional first lead connected to the first conductive member 621. That is, the battery 601 may have two first lead-out electrodes 120.

[0226] The second lead electrode 130 is connected to the second current collector 15 of each of the two power generation elements 10. That is, two second current collectors 15 are respectively connected to the upper and lower surfaces of the second conductive member 131 of the second lead electrode 130.

[0227] As described above, the battery 601 according to this embodiment includes multiple power generation elements 10 connected in parallel, thus enabling the realization of a battery 601 with large capacity and high reliability.

[0228] The manufacturing method of battery 601 and Figure 6 The manufacturing method of the battery 101 involved in Embodiment 2 is the same. Specifically, after forming the power generation elements 10 in parallel or sequentially multiple times (S10 to S14), a plurality of power generation elements 10 are stacked. At this time, two power generation elements 10 are stacked with the second lead electrode 130 sandwiched between them. Then, the first lead electrode 620 is connected (S20). Then, an insulating layer 540 is formed in such a way that it covers the outer peripheral ends of the end faces of each of the plurality of power generation elements 10, the upper surface of the uppermost power generation element 10, and the lower surface of the lowermost power generation element 10 (S16).

[0229] Additionally, the first lead electrode 620 may have a first conductive member 21 instead of the first conductive member 121 or 621. Furthermore, the battery 601 may have a second lead electrode 30, 230, or 330 instead of the second lead electrode 130. Additionally, the battery 601 may have at least one of the bonding layers 420 and 430.

[0230] In addition, multiple Figure 11 The battery 601 is shown in the stack. Figure 12 These are top and cross-sectional views of the battery 701 involved in a variation of this embodiment. Specifically, Figure 12 (a) is a top view of battery 701 viewed from the front side of the z-axis. Figure 12 (b) shows Figure 12 (a) The cross section at the position shown by the XIIb-XIIb line. Figure 12 (c) shows Figure 12 (a) Cross section at the position shown by the XIIC-XIIC line.

[0231] like Figure 12 As shown, battery 701 has Figure 11 The diagram shows a stacked structure of two batteries 601. Specifically, battery 701 comprises two batteries 601 and an insulating sheet 750. The two batteries 601 are stacked with the insulating sheet 750 in between.

[0232] The insulating sheet 750 is, for example, an insulating resin material, and also functions as a cushioning material. The insulating sheet 750 helps to mitigate the stress caused by the expansion resulting from the heat generated by the battery 701. Alternatively, the battery 701 may not have the insulating sheet 750.

[0233] In this modified example, the second lead 32 of the second lead electrode 130 of the two batteries 601 shares one. That is, the two second lead electrodes 130 have the same structure as the first lead electrode 620. Alternatively, the two second leads 32 may not share one.

[0234] As described above, further increases in capacity have been achieved with battery 701.

[0235] (Modified Example)

[0236] Next, variations of the above embodiments will be described. Specifically, variations of the lead-out electrode will be described.

[0237] [Variation Example 1]

[0238] Figure 13This is a top view of the lead-out electrode 820 according to Modification 1. The lead-out electrode 820 can be used as at least one of the first lead-out electrode and the second lead-out electrode according to the above embodiments.

[0239] like Figure 13 As shown, the lead electrode 820 includes a conductive member 821 and a lead wire 822. The lead wire 822 is the same as the first lead wire 22 or the second lead wire 32 involved in Embodiment 1, so its description is omitted.

[0240] The conductive member 821 differs from the first and second conductive members in each embodiment in that its sheet resistance is non-uniform. Specifically, the sheet resistance of the conductive member 821 decreases the further away from the lead 822. In this modified example, since the lead 822 is located at the end in the positive direction of the x-axis, the sheet resistance of the conductive member 821 decreases as it moves toward the negative direction of the x-axis.

[0241] Specifically, the conductive member 821 is provided with a plurality of through holes 823. The sheet resistance of the conductive member 821 is adjusted by at least one of the arrangement density and opening area of ​​the plurality of through holes 823. Figure 13 The multiple through holes 823 shown are all the same size and have the same opening area. The density of the multiple through holes 823 decreases as they are further away from the lead 822. That is, the number of multiple through holes 823 is greater in the region near the lead 822 and less in the region farther away from the lead 822. According to this configuration, the sheet resistance increases in the region of the conductive member 821 near the lead 822 and decreases in the region of the conductive member 821 farther away from the lead 822. The multiple through holes 823 can be formed by stamping the flat conductive member 821.

[0242] When the resistance of the thin film of the conductive component 821 is uniform in plane, the electric field tends to concentrate in the region near the lead 822. In the region where the electric field is concentrated, the degradation of the power generation element tends to progress.

[0243] In contrast, in this modified example, by increasing the resistance of the thin film in the region near lead 822, the electric field is less likely to concentrate near lead 822. This suppresses localized electric field concentration, thereby inhibiting localized battery degradation. Therefore, battery reliability can be improved.

[0244] Furthermore, the opening areas of the multiple through holes 823 can be different. For example, the opening area of ​​the multiple through holes 823 decreases as they are further away from the lead 822. In this case, local electric field concentration can also be suppressed, thereby suppressing localized degradation of the battery. Therefore, the reliability of the battery can be improved.

[0245] [Variation Example 2]

[0246] In addition, such as Figure 14 As shown, the thickness of conductive components can be varied. Figure 14 These are the top and cross-sectional views of the lead-out electrode 920 involved in Modified Example 2. Figure 14 (a) is a top view of the lead-out electrode 920 viewed from the negative z-axis. Figure 14 (b) shows Figure 14 (a) Cross section at the position shown by line XIVb-XIVb.

[0247] like Figure 14 As shown, the lead electrode 920 includes a conductive member 921 and a lead wire 822. (As indicated...) Figure 14 As shown in (b), the thickness of the conductive member 921 increases with distance from the lead 822. The conductive member 921 has main surfaces 921a and 921b. Main surface 921a is the surface connected to the current collector. Main surface 921b is the surface opposite to main surface 921a and is inclined relative to main surface 921a. Thus, the thickness of the conductive member 921 varies smoothly according to its distance from the lead 822. Alternatively, main surface 921a can also be formed in a stepped shape.

[0248] The greater the thickness of the conductive component 921, the greater the sheet resistance; conversely, the smaller the thickness, the smaller the sheet resistance. Therefore, Figure 14 The lead-out electrode 920 shown can also suppress local electric field concentration, thereby suppressing local degradation of the battery.

[0249] Alternatively, multiple through holes 823 can be provided in the conductive component 921.

[0250] (Other implementation methods)

[0251] The above description illustrates one or more battery solutions based on various embodiments, but this disclosure is not limited to these embodiments. Any technical solutions derived from various modifications conceived by those skilled in the art, or technical solutions constructed by combining elements from different embodiments, are included within the scope of this invention, provided they do not depart from the spirit of this disclosure.

[0252] For example, in the above embodiment, an example is shown where both the positive and negative terminals of the battery have conductive members and leads, but it is possible to have only one of them. That is, the battery may not have a second terminal including a second conductive member and a second lead. For example, it may be provided on the current collector of one of the positive and negative terminals of the battery. Figure 1 and Figure 2 The connector shown is directly connected to the second lead. Even in this case, with... Figure 1 and Figure 2Compared to the case where the terminals are set on both current collectors, the required cutting precision is also lower, thus improving battery reliability.

[0253] Furthermore, the above embodiments can be modified, substituted, added, omitted, etc., within the scope of the claims or their equivalents.

[0254] Industry availability

[0255] The batteries disclosed herein can be used, for example, as secondary batteries such as all-solid-state batteries used in various electronic devices or automobiles.

[0256] Explanation of reference numerals in the attached figures

[0257] 1, 101, 201, 301, 401, 501, 601, 701 batteries

[0258] 10. Power generation components

[0259] 11 First Electrode

[0260] 12 First collector

[0261] Main face of 12a, 15a, 921a, 921b

[0262] 13 First active substance layer

[0263] 14 Second Electrode

[0264] 15 Second collector

[0265] 16 Second active substance layer

[0266] 17 Solid electrolyte layer

[0267] 20, 120, 220, 620 First lead electrode

[0268] 21, 121, 621 First conductive component

[0269] Areas 21a, 31a, 121a, 131a, 231a, and 331a

[0270] 22 First Lead

[0271] 30, 130, 230, 330 Second lead-out electrodes

[0272] 31, 131, 231, 331 Second conductive component

[0273] 32, 332 Second lead

[0274] 40, 140, 540 insulation layers

[0275] 250 spacers

[0276] 420, 430 bonding layer

[0277] 750 insulating sheet

[0278] 820, 920 lead-out electrodes

[0279] 821 and 921 conductive components

[0280] 822 lead wire

[0281] 823 Through Hole

Claims

1. A battery comprising a power generation element and a first lead electrode, The power generation element includes a first electrode, a second electrode, and an electrolyte layer located between the first electrode and the second electrode. The first electrode includes a first current collector and a first active material layer located between the first current collector and the electrolyte layer. The first lead electrode includes a first conductive member and a first lead connected to the first conductive member. The first conductive member is connected to a first surface of the first current collector opposite to the first active material layer. The first conductive member has a region that does not overlap with the first current collector when viewed from above. The first lead is connected to the first conductive member only in the region described above.

2. The battery according to claim 1, The first conductive member is in contact with the first surface of the first current collector.

3. The battery according to claim 1 or 2, It also includes a bonding layer located between the first current collector and the first conductive member. The first conductive member is connected to the first surface of the first current collector via the bonding layer.

4. The battery according to claim 3, The bonding layer is conductive.

5. The battery according to claim 1 or 2, The first current collector and the first conductive member contain the same material.

6. The battery according to claim 1 or 2, The thickness of the first conductive component is greater than or equal to the thickness of the first current collector.

7. The battery according to claim 1 or 2, It also has an insulating layer arranged in a frame shape along the end face of the power generation element.

8. The battery according to claim 7, The insulating layer also covers the end of the first surface of the first current collector.

9. The battery according to claim 1 or 2, The first conductive member covers the entire first surface of the first current collector when viewed from above.

10. The battery according to claim 1 or 2, The further the first conductive component is from the first lead, the smaller the resistance of the thin film.

11. The battery according to claim 10, The first conductive component is provided with multiple through holes. The density of the plurality of through holes and the opening area are smaller the further away from the first lead.

12. The battery according to claim 10, The thickness of the first conductive component increases the further away from the first lead.

13. The battery according to claim 1 or 2, It also has a second lead-out electrode. The second electrode includes a second current collector and a second active material layer located between the second current collector and the electrolyte layer. The second lead electrode includes a second conductive member and a second lead connected to the second conductive member. The second conductive member is connected to the second side of the second current collector opposite to the second active material layer.

14. The battery according to claim 13, The first conductive member extends from the power generation element in a first direction when viewed from above. The second conductive member extends from the power generation element in a second direction when viewed from above. The first lead is connected to the protruding portion of the first conductive member. The second lead is connected to the protruding portion of the second conductive member.

15. The battery according to claim 14, The first direction is opposite to the second direction.

16. The battery according to claim 14, The first direction and the second direction are the same direction.

17. The battery according to claim 14, The first direction is orthogonal to the second direction.

18. The battery according to claim 1 or 2, The electrolyte layer contains a solid electrolyte that is lithium-ion conductive.

19. The battery according to claim 1 or 2, Equipped with multiple of the aforementioned power generation elements, The first lead electrode is connected to the first current collector of the first power generation element, which is one of the plurality of power generation elements. A second power generation element, as one of the plurality of power generation elements, is stacked on the second electrode side of the first power generation element.

20. The battery according to claim 19, The second electrode of the first power generation element is connected to the first electrode of the second power generation element.

21. The battery according to claim 19, The second electrode of the first power generation element is connected to the second electrode of the second power generation element.

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