Battery

Abstract

A battery (1000) of the present disclosure includes: an electricity generation element (110) including layered positive electrode layers (102, 105), negative electrode layers (103, 106), and an electrolyte layer (104); and a support body (200) that supports the electricity generation element (110). The electricity generation element includes a first plane (111) that is a plane horizontal to the layering direction (z), and a second plane (112) that is a plane vertical to the layering direction. The support body (200) includes: a first support body (210) that contacts the first plane; and a second support body (200) including a bent part (221) that imparts elastic force to the electricity generation element in the direction (z) vertical to the second plane. Stress caused by distension of the electricity generation element mainly occurs in the layering direction (z). The bent part (221) can similarly impart elastic force in the layering direction (z). Provision of such a bent part makes the pressure for supporting the electricity generation element less likely to increase, even if distension of the electricity generation element occurs. Accordingly, peeling and cracking of the electricity generation element can be suppressed.

Description

[Technical field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] Patent Document 1 discloses a connection member for connecting a power generating element including a positive electrode, a negative electrode, and an electrolyte. The connection member is composed of a flat portion and a curved portion, and is disposed so that the bottom surface of the power generating element and the flat portion of the connection member are in contact with each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-170941 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a highly reliable battery. [Means for solving the problem]

[0005] According to certain non-limiting exemplary embodiments of the present disclosure, the following is provided:

[0006] A battery in one embodiment of the present disclosure includes a power generating element having a stacked positive electrode layer, a negative electrode layer, and an electrolyte layer, and a support supporting the power generating element, wherein the power generating element has a first plane that is a plane horizontal to the stacking direction and a second plane that is a plane perpendicular to the stacking direction, and the support has a first support portion in contact with the first plane and a second support portion including a bent portion that imparts an elastic force to the power generating element in a direction perpendicular to the second plane. Effect of the Invention

[0007] According to the present disclosure, a highly reliable battery can be provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a battery according to the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a section of the power generating element taken along line II-II in FIG. [Figure 3A] FIG. 3A is a side view of the battery according to the embodiment when it is housed in a housing. [Figure 3B] FIG. 3B is a side view of the battery of the comparative example when housed in a housing. [Figure 4A] FIG. 4A is a side view of the periphery of a second support portion included in the battery according to the first to third modifications of the embodiment. [Figure 4B] FIG. 4B is a side view of the periphery of the second support portion included in the battery according to the fourth to sixth modifications of the embodiment. [Diagram 5] FIG. 5 is a side view of the battery according to the seventh modification of the embodiment when it is housed in a housing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Findings on which this disclosure is based) The present inventors have found that the technology of Patent Document 1 described in the "Background Art" section has the following problems.

[0010] First, the inventor's viewpoint will be explained below. In conventional batteries, a problem is that reliability is reduced due to volume changes in the power generating element that accompany charging and discharging.

[0011] For example, a battery including a solid electrolyte will be described. More specifically, the battery includes a power generating element, and the power generating element has a laminated solid electrolyte and an electrode active material. Such a battery is, for example, an all-solid-state battery. In addition, in such a battery, the components (i.e., the solid electrolyte and the electrode active material) are solid materials, so that the interface between the electrode active material and the solid electrolyte is a solid-solid interface.

[0012] In general, all-solid-state batteries are produced by pressure molding. Depending on the conditions of pressure molding, the bonding between particles (here, the particles are, for example, electrode active material particles and / or solid electrolyte particles) may become insufficient, and the charge / discharge reaction in the power generating element may proceed unevenly. In addition, since the electrode active material expands and contracts with charging and discharging, when there are many electrode active material particles with different charge / discharge depths, stress is generated everywhere in the power generating element. When the stress spreads to the entire power generating element, the electrode active material and the solid electrolyte peel off, or fine cracks occur in the electrode active material and the solid electrolyte. As a result, the ion conduction and electron conduction paths are blocked, and the battery characteristics are greatly reduced.

[0013] It is also known that the stress due to the expansion of the electrode active material (i.e., the stress due to the expansion of the power generating element) occurs mainly in the stacking direction of the solid electrolyte and the electrode active material. Therefore, the opposing surfaces of the power generating element perpendicular to the stacking direction (e.g., the bottom surface and the top surface) are easily affected by the stress due to the expansion of the power generating element and are easily deformed toward the outside of the power generating element.

[0014] Incidentally, in order to mount a battery in a case or the like, the battery needs to be supported. For example, in Patent Document 1, the power generating element (battery) is supported by a connection member. Specifically, the connection member supports the power generating element so as to sandwich the opposing surfaces of the power generating element (the bottom surface of the negative electrode can and the bottom surface of the positive electrode can in Patent Document 1).

[0015] Therefore, when the expanding power generating element (battery) is supported by being sandwiched between the connecting members, pressure to support the power generating element may occur in the opposite direction to the stress caused by the expansion (i.e., in the direction that suppresses the expansion of the power generating element). In this case, when the power generating element expands, the stress caused by the expansion of the power generating element presses the connecting members. As a result, the connecting members push back, increasing the pressure to support the power generating element, i.e., increasing the force that suppresses the expansion of the power generating element, making peeling or cracking more likely to occur in the power generating element.

[0016] This results in a significant decrease in battery performance, and such batteries have low reliability.

[0017] (Summary of the Disclosure) In order to solve such problems, a battery according to one embodiment of the present disclosure includes a power generating element having a stacked positive electrode layer, a negative electrode layer, and an electrolyte layer, and a support supporting the power generating element, wherein the power generating element has a first plane that is a plane horizontal to the stacking direction and a second plane that is a plane perpendicular to the stacking direction, and the support has a first support portion in contact with the first plane and a second support portion including a bent portion that imparts an elastic force to the power generating element in a direction perpendicular to the second plane.

[0018] As a result, the first support portion contacts and supports the first plane. Since the first plane is parallel to the stacking direction, it is less susceptible to the stress caused by the expansion of the power generating element and is less likely to deform. Since the first support portion contacts and supports the first plane, the support can easily support the power generating element.

[0019] In addition, stress due to expansion of the power generating element occurs mainly in the stacking direction. The bent portion can also impart elastic force in the stacking direction. By providing such a bent portion, even if the power generating element expands, the pressure for supporting the power generating element is unlikely to increase, so that peeling or cracking in the power generating element can be suppressed.

[0020] In other words, by providing the support, the power generating element can be easily supported and the occurrence of peeling or cracking in the power generating element can be suppressed, thereby obtaining a highly reliable battery.

[0021] Furthermore, for example, the support may be an electrode terminal, and the support may be connected to one of the positive electrode layer and the negative electrode layer.

[0022] As a result, the support supports the power generating element and is electrically connected to the power generating element, eliminating the need for separate electrodes, etc. This makes it possible to prevent the battery from becoming large in size.

[0023] Also, for example, the second support portion may further include a parallel surface portion extending parallel to the second plane, and the parallel surface portion may be in contact with the second plane.

[0024] With this, in addition to the first support portion supporting the first plane, the parallel surface portion supports the second plane, so that the support can more easily support the power generating element.

[0025] Furthermore, for example, the second support portion may be separated from the second plane.

[0026] As a result, even if the power generating element expands, the second flat surface of the power generating element does not come into contact with the second support part, and the second flat surface does not receive pressure from the second support part, thereby making it possible to suppress the occurrence of peeling or cracks in the power generating element.

[0027] For example, the support may further include a resin member located between the second support portion and the second plane.

[0028] As a result, in addition to the first support member supporting the first plane, the second support member supports the second plane via the resin member, allowing the support member to more easily support the power generating element.

[0029] Also, for example, the first support portion may be in contact with the entire surface of the first plane.

[0030] This increases the contact area between the support and the power generating element, allowing the support to more easily support the power generating element.

[0031] Furthermore, for example, the support may protrude from the second plane in a direction perpendicular to the second plane by 1 mm or more and 10 mm or less.

[0032] As a result, the protruding distance is 1 mm or more, and sufficient space is created around the power generating element. Therefore, even if the power generating element expands, the second plane of the power generating element does not come into contact with surrounding objects, and the second plane is not subjected to pressure from surrounding objects. This makes it possible to suppress the occurrence of peeling or cracks in the power generating element.

[0033] Furthermore, by keeping the protruding distance to 10 mm or less, unnecessary space around the power generating element can be reduced, preventing the battery from becoming too large.

[0034] Furthermore, for example, the support may protrude from the first plane in a direction opposite to the power generating element by 0.1 mm to 10 mm.

[0035] As described above, the power generating element mainly deforms in the stacking direction. However, the power generating element also deforms, albeit slightly, in a direction perpendicular to the stacking direction. Therefore, by setting the distance by which the power generating element protrudes in a direction perpendicular to the stacking direction (e.g., from the first plane to the opposite side of the power generating element) to 0.1 mm or more, even if the power generating element deforms so as to extend in a direction perpendicular to the stacking direction, the power generating element is allowed to deform in the perpendicular direction. This reduces the deformation of the power generating element, improving the reliability of the battery.

[0036] Furthermore, by reducing the protruding distance, the battery can be mounted in a smaller area, and therefore by keeping the protruding distance to 10 mm or less, the battery size can be prevented from increasing.

[0037] Furthermore, for example, the support may be made of a plate member having a thickness of 50 μm or more and 5000 μm or less.

[0038] This improves the mechanical strength of the support when the thickness is 50 μm or more, and makes it easier to form bent portions in the support when the thickness is 5000 μm or less.

[0039] Furthermore, for example, the electrolyte layer may be a solid electrolyte layer.

[0040] This makes it possible to improve the reliability of an all-solid-state battery that includes a solid electrolyte.

[0041] Also, for example, the power generating element may include a plurality of stacked battery cells, and each of the plurality of battery cells may include the positive electrode layer, the negative electrode layer, and the electrolyte layer.

[0042] In this way, by stacking a plurality of battery cells, a battery with increased voltage or capacity can be obtained, and the reliability of such a battery can be improved.

[0043] Furthermore, for example, the cross-sectional shape of the bent portion cut by a plane perpendicular to the first plane and the second plane may include a U-shape, a V-shape, or an L-shape.

[0044] In this way, the cut cross-sectional shape of the bent portion includes the above-mentioned shape, so that sufficient elasticity can be exerted.

[0045] Hereinafter, an embodiment of a battery according to the present disclosure will be described with reference to the drawings.

[0046] In addition, the embodiments described below each show a preferred specific example. Therefore, the numerical values, shapes, materials, components, arrangements and connection forms of the components shown in the following embodiments are examples, and the present disclosure is not intended to be limited thereto. Therefore, among the components in the following embodiments, components that are not described in the independent claims showing the highest concept are described as optional components. In addition, each figure is a schematic diagram and is not necessarily illustrated strictly. In addition, the same reference numerals are given to the same components in each figure.

[0047] In addition, various elements shown in the drawings are merely shown diagrammatically for the understanding of the present disclosure, and the dimensional ratio and appearance may differ from the actual product. In other words, each drawing is a diagrammatic view and is not necessarily strictly illustrated. Therefore, for example, the scales in each drawing do not necessarily match. In addition, in this specification, the numerical range is not an expression that expresses only a strict meaning, but an expression that means that it includes a substantially equivalent range, for example, a difference of about several percent.

[0048] Furthermore, in the description of the structure in this specification, the terms "upper" and "lower" do not refer to the upper direction (vertically upward) and lower direction (vertically downward) in an absolute spatial sense, but are used as terms defined by a relative positional relationship based on the stacking order in the stacked configuration.

[0049] In the following explanations, lithium is referred to as Li, sulfur as S, phosphorus as P, silicon as S, boron as B, germanium as Ge, fluorine as F, chlorine as Cl, bromine as Br, iodine as I, oxygen as O, aluminum as Al, gallium as Ga, indium as In, iron as Fe, zinc as Zn, titanium as Ti, lanthanum as La, zirconium as Zr, nitrogen as N, hydrogen as H, arsenic as As, antimony as Sb, tellurium as Te, carbon as C, selenium as Se, yttrium as Y, and magnesium as Mg.

[0050] (Embodiment) A battery 1000 according to an embodiment will be described with reference to FIGS. 1 to 3B.

[0051] Fig. 1 is a perspective view showing a schematic configuration of a battery 1000 according to the present embodiment. Fig. 2 is a cross-sectional view showing a cut surface of the power generating element 110 taken along line II-II in Fig. 1. Fig. 3A is a side view showing the battery 1000 according to the present embodiment housed in a housing 400. Fig. 3B is a side view showing the battery 1000x of the comparative example housed in the housing 400.

[0052] The battery 1000 of this embodiment includes a power generating element 110 and a support 200. The battery 1000 according to this embodiment is housed in a housing (see FIG. 3).

[0053] First, the power generating element 110 will be described with reference to FIGS.

[0054] The power generating element 110 has a plurality of stacked battery cells 101 and an insulating portion 120. Each of the plurality of battery cells 101 has a positive electrode layer, a negative electrode layer, and an electrolyte layer. Thus, the power generating element 110 has a stacked positive electrode layer, a negative electrode layer, and an electrolyte layer. In this embodiment, the positive electrode layer includes a positive electrode 102 and a positive electrode current collector 105, the negative electrode layer includes a negative electrode 103 and a negative electrode current collector 106, and the electrolyte layer is a solid electrolyte layer 104.

[0055] The shape of the power generating element 110 in a plan view (i.e., the shape of the power generating element 110 when viewed in the negative direction of the z axis) is rectangular, but is not limited to this. The area of ​​the main surface of the power generating element 110 (the surface visible when viewed in a plan view) is, for example, 1 cm 2 More than 1000cm 2 It may be the following.

[0056] The positive electrode 102 is a layer including a positive electrode active material, or may be a positive electrode mixture layer including a positive electrode active material and a solid electrolyte.

[0057] Examples of the positive electrode active material contained in the positive electrode 102 include lithium-containing transition metal oxides, transition metal fluorides, polyanion materials, fluorinated polyanion materials, transition metal sulfides, transition metal oxyfluorides, transition metal oxysulfides, and transition metal oxynitrides. In particular, when a lithium-containing transition metal oxide is used as the positive electrode active material, it is possible to reduce the manufacturing cost and increase the average discharge voltage.

[0058] The shape of the positive electrode active material may be a particle shape. In this case, the median diameter of the positive electrode active material particles may be 0.1 μm or more and 100 μm or less. If the median diameter of the positive electrode active material particles is smaller than 0.1 μm, there is a possibility that the positive electrode active material particles and the solid electrolyte cannot form a good dispersion state in the positive electrode 102. This leads to a deterioration in the charge and discharge characteristics of the battery. If the median diameter of the positive electrode active material particles is larger than 100 μm, the ion diffusion in the positive electrode active material particles becomes slow. For this reason, it may be difficult for the battery to operate at high output. The median diameter of the positive electrode active material particles may be larger than the median diameter of the solid electrolyte particles. This leads to a good dispersion state of the positive electrode active material and the solid electrolyte.

[0059] The thickness of the positive electrode 102 (i.e., the length in the z-axis direction) may be 10 to 500 μm. If the thickness of the positive electrode 102 is thinner than 10 μm, it may be difficult to ensure a sufficient energy density of the battery. If the thickness of the positive electrode 102 is thicker than 500 μm, it may be difficult to operate at high output.

[0060] The positive electrode current collector 105 may be, for example, a porous or non-porous sheet or film made of a metal material such as aluminum, stainless steel, titanium, or an alloy of these metals. Aluminum and aluminum alloys are inexpensive and easy to form into a thin film. The sheet or film may be a metal foil or a mesh sheet. The thickness of the positive electrode current collector 105 may be 1 to 30 μm. If the thickness of the positive electrode current collector 105 is thinner than 1 μm, the mechanical strength is insufficient and cracks or breaks are likely to occur. If the thickness of the positive electrode current collector 105 is thicker than 30 μm, the energy density of the battery may decrease.

[0061] The negative electrode 103 is a layer containing a negative electrode active material, or may be a negative electrode mixture layer containing a negative electrode active material and a solid electrolyte.

[0062] The negative electrode active material contained in the negative electrode 103 may be, for example, a material that absorbs and releases metal ions. The negative electrode active material may be, for example, a material that absorbs and releases lithium ions. For example, lithium metal, a metal or alloy that exhibits an alloying reaction with lithium, carbon, a transition metal oxide, or a transition metal sulfide, etc., may be used as the negative electrode active material. For example, an alloy of lithium with a silicon compound, a tin compound, or an aluminum compound, etc., may be used as the metal or alloy that exhibits an alloying reaction with lithium. For example, graphite or non-graphitic carbon such as hard carbon or coke may be used as the carbon. For example, copper oxide (CuO) or nickel oxide (NiO), etc. may be used as the transition metal sulfide. For example, copper sulfide represented by CuS, etc. may be used as the transition metal sulfide. In particular, when carbon is used as the negative electrode active material, it is possible to reduce the manufacturing cost and increase the average discharge voltage. From the viewpoint of capacity density, silicon (Si), tin (Sn), a silicon compound, or a tin compound is preferably used as the negative electrode active material.

[0063] The shape of the negative electrode active material may be a particle shape. In this case, the median diameter of the negative electrode active material particles may be 0.1 μm or more and 100 μm or less. If the median diameter of the negative electrode active material particles is smaller than 0.1 μm, there is a possibility that the negative electrode active material particles and the solid electrolyte cannot form a good dispersion state in the negative electrode 103. This leads to a deterioration in the charge and discharge characteristics of the battery. If the median diameter of the negative electrode active material particles is larger than 100 μm, the lithium diffusion in the negative electrode active material particles becomes slow. For this reason, it may be difficult for the battery to operate at high output. The median diameter of the negative electrode active material particles may be larger than the median diameter of the solid electrolyte particles. This leads to a good dispersion state of the negative electrode active material and the solid electrolyte.

[0064] The thickness of the negative electrode 103 may be 10 μm to 500 μm. If the thickness of the negative electrode 103 is thinner than 10 μm, it may be difficult to ensure a sufficient energy density of the battery. If the thickness of the negative electrode 103 is thicker than 500 μm, it may be difficult to operate at high output.

[0065] The negative electrode current collector 106 may be, for example, a porous or non-porous sheet or film made of a metal material such as stainless steel, nickel, copper, or an alloy of these metals. Copper and copper alloys are inexpensive and easy to form into a thin film. The sheet or film may be a metal foil or a mesh sheet. The thickness of the negative electrode current collector 106 may be 1 to 30 μm. If the thickness of the negative electrode current collector 106 is thinner than 1 μm, the mechanical strength is insufficient and cracks or breaks are likely to occur. If the thickness of the negative electrode current collector 106 is thicker than 30 μm, the energy density of the battery may decrease.

[0066] The solid electrolyte layer 104 includes a solid electrolyte.

[0067] The thickness of the solid electrolyte layer 104 may be 1 to 200 μm. If the thickness of the solid electrolyte layer 104 is thinner than 1 μm, the possibility of short-circuiting between the positive electrode 102 and the negative electrode 103 increases. If the thickness of the solid electrolyte layer 104 is thicker than 200 μm, it may become difficult to operate at high output.

[0068] The solid electrolyte contained in the positive electrode 102, the negative electrode 103, and the solid electrolyte layer 104 may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, a halide solid electrolyte, a polymer solid electrolyte, or a complex hydride solid electrolyte. The solid electrolytes contained in the positive electrode 102, the negative electrode 103, and the solid electrolyte layer 104 may each be made of a different material.

[0069] Examples of sulfide solid electrolytes include Li2S-P2S5, Li2S-SiS2, Li2S-B2S3, Li2S-GeS2, and Li 3.25 Ge 0.25 P0.75 S4, Li 10 GeP2S 12 , etc. may be used. In addition, LiX (X: F, Cl, Br, I), Li2O, MOp, LiqMOr (M: P, Si, Ge, B, Al, Ga, In, Fe, Zn) (p, q, r: natural numbers), etc. may be added to these.

[0070] Examples of oxide solid electrolytes include NASICON (Na Super Ionic Conductor) type solid electrolytes, such as LiTi2(PO4)3 and its elemental substitutes, (LaLi)TiO3-based perovskite-type solid electrolytes, Li 14 ZnGeO 16 , Li4SiO4, LiGeO4 and their elemental substitutes, LISICON (Lithium Super Ionic Conductor) type solid electrolytes, Li7La3Zr2O 12 Garnet-type solid electrolytes, such as Li3N and its elemental substitution products, Li3PO4 and its N-substitution products, or glasses or glass ceramics based on Li-BO compounds such as LiBO2 or Li3BO3 to which Li2SO4 or Li2CO3 has been added, can be used.

[0071] As the halide solid electrolyte, for example, the composition formula Li α M β X γA material may be used in which α, β, and γ are greater than 0, M includes at least one of metal elements and metalloid elements other than Li, and X is one or more elements selected from the group consisting of Cl, Br, I, and F. Here, the metalloid element is B, Si, Ge, As, Sb, or Te. The metal element is all elements included in Groups 1 to 12 of the periodic table except for hydrogen, and all elements included in Groups 13 to 16 except for the above metalloid elements and C, N, P, O, S, and Se. That is, the metal element is a group of elements that can become cations when forming an inorganic compound with a halogen compound. For example, Li3YX6, Li2MgX4, Li2FeX4, LiAX4, or Li3AX6 (wherein A is Al, Ga, or In), etc. (X: F, Cl, Br, I) may be used as the halide solid electrolyte.

[0072] As the polymer solid electrolyte, for example, a compound of a polymer compound and a lithium salt can be used. The polymer compound may have an ethylene oxide structure. When the polymer compound has an ethylene oxide structure, it can contain a large amount of lithium salt, and the ionic conductivity can be further increased. As the lithium salt, LiPF6, LiBF4, LiSbF6, LiAsF6, LiSO3CF3, LiN(SO2CF3)2, LiN(SO2C2F5)2, LiN(SO2CF3)(SO2C4F9), LiC(SO2CF3)3, etc. can be used. As the lithium salt, one type of lithium salt selected from these can be used alone. Or, as the lithium salt, a mixture of two or more types of lithium salts selected from these can be used.

[0073] As the complex hydride solid electrolyte, for example, LiBH4-LiI or LiBH4-P2S5 can be used.

[0074] The solid electrolyte may be in the form of particles.

[0075] At least one of the positive electrode 102, the solid electrolyte layer 104, and the negative electrode 103 may contain a binder for the purpose of improving the adhesion between particles. The binder is used to improve the binding property of the material constituting the electrode. Examples of the binder include polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polyacrylic acid methyl ester, polyacrylic acid ethyl ester, polyacrylic acid hexyl ester, polymethacrylic acid, polymethacrylic acid methyl ester, polymethacrylic acid ethyl ester, polymethacrylic acid hexyl ester, polyvinyl acetate, polyvinylpyrrolidone, polyether, polyethersulfone, hexafluoropolypropylene, styrene butadiene rubber, and carboxymethyl cellulose. The binder may be a copolymer of two or more materials selected from tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoroalkyl vinyl ether, vinylidene fluoride, chlorotrifluoroethylene, ethylene, propylene, pentafluoropropylene, fluoromethyl vinyl ether, acrylic acid, and hexadiene. Two or more of these materials may be mixed and used as the binder.

[0076] At least one of the positive electrode 102 and the negative electrode 103 may contain a conductive assistant for the purpose of increasing electronic conductivity. Examples of the conductive assistant include carbon fluoride, graphites such as natural graphite or artificial graphite, carbon blacks such as acetylene black or Ketjen Black (registered trademark), conductive fibers such as carbon fibers or metal fibers, metal powders such as aluminum, conductive whiskers such as zinc oxide or potassium titanate, conductive metal oxides such as titanium oxide, or conductive polymer compounds such as polyaniline, polypyrrole, or polythiophene. When a carbon conductive assistant such as graphites or carbon blacks is used, it is possible to reduce costs.

[0077] The insulating section 120 is an insulating layer that covers the faces of the power generating element 110 that are parallel to the stacking direction. The faces of the power generating element 110 that are parallel to the stacking direction are, specifically, faces of the power generating element 110 that are parallel to the yz plane and the zx plane.

[0078] The insulating portion 120 has an insulating property sufficient to electrically insulate the support 200 from the positive electrode layer or negative electrode layer of the power generating element 110 when the support 200 is an electrode terminal (details will be described later).

[0079] The material constituting the insulating portion 120 is, for example, a resin material, but is not particularly limited.

[0080] 2, in each of the battery cells 101, a negative electrode layer (negative electrode current collector 106 and negative electrode 103), an electrolyte layer (solid electrolyte layer 104), and a positive electrode layer (positive electrode 102 and positive electrode current collector 105) are stacked in this order. Therefore, the stacking direction is the direction along the z-axis.

[0081] 1, the power generating element 110 has a first plane 111 that is a plane horizontal to the stacking direction, and a second plane 112 that is a plane perpendicular to the stacking direction. Since the stacking direction is along the z-axis, the first plane 111 is a plane parallel to the yz plane, and the second plane 112 is a plane parallel to the xy plane. The power generating element 110 may have a third plane 113 facing the first plane 111.

[0082] In this embodiment, the first plane 111 and the third plane 113 are planes where the insulating portion 120 is exposed, and the second plane 112 is a plane where the negative electrode current collector 106 included in the negative electrode layer is exposed.

[0083] It is known that the power generating element 110 mainly expands in the stacking direction. Therefore, the power generating element 110 mainly deforms so as to extend in the positive z-axis direction and the negative z-axis direction. Therefore, the first plane 111 and the third plane 113 are less susceptible to the effect of stress due to the expansion of the power generating element 110 and are less likely to deform. On the other hand, the second plane 112 is more susceptible to the effect of stress due to the expansion of the power generating element 110 and is more likely to deform.

[0084] Next, the housing 400 will be described with reference to Fig. 3A. Fig. 3A shows a side view of the battery 1000 and a cross-sectional view of the housing 400.

[0085] The housing 400 is a container that houses the battery 1000. The housing 400 may house a plurality of batteries 1000. The shape of the housing 400 is a rectangular parallelepiped shape having an internal space that houses the battery 1000, but is not particularly limited to this shape. The housing 400 is made of metal or resin, but is not particularly limited to this shape.

[0086] 3A, the housing 400 has an upper surface portion 401 and a bottom surface portion 402. The upper surface portion 401 is in contact with the power generating element 110. In order to mount the battery 1000 in the internal space of the housing 400, a support 200 is used.

[0087] Next, the support 200 will be described with reference to Figures 1 and 3A. Note that Figure 3A shows a direction P in which stress occurs due to the expansion of the power generating element 110.

[0088] The support 200 is a member that supports the power generating element 110. Between the support 200 and the power generating element 110, for example, an adhesive layer may be provided.

[0089] The support 200 has a first support portion 210 and a second support portion 220 .

[0090] The first support part 210 contacts the first plane 111. More specifically, the first support part 210 contacts and supports the first plane 111. The shape of the first support part 210 is a flat plate shape, but is not particularly limited as long as it can contact the first plane 111.

[0091] In this way, the first support portion 210 contacts and supports the power generating element 110 against the first plane 111, which is less susceptible to the effects and deformation of stress caused by the expansion of the power generating element 110. Therefore, the support 200 can easily support the power generating element 110.

[0092] Furthermore, as shown in FIG. 1, the first support portion 210 may be in contact with the entire surface of the first plane 111.

[0093] In this way, the contact area between the support 200 and the power generating element 110 is increased, so that the support 200 can support the power generating element 110 more easily.

[0094] The first support part 210 may be in contact with a part of the first plane 111. For example, the length d2 of the first support part 210 in the y-axis direction may be shorter than the length of the power generating element 110 in the y-axis direction.

[0095] The second support portion 220 may be connected to the bottom surface portion 402 of the housing 400. In other words, the bottom surface portion 402 is a support surface that supports the battery 1000.

[0096] Furthermore, by providing the support 200, the power generating element 110 is spaced apart from the support surface (the bottom surface portion 402 of the housing).

[0097] The second support portion 220 includes a bent portion 221 and a parallel surface portion 222 .

[0098] The parallel surface portion 222 extends parallel to the second plane 112 of the power generating element 110, and is in contact with the second plane 112. The parallel surface portion 222 included in the second support portion 220 may be connected to the first support portion 210.

[0099] In this way, in addition to the first support portion 210 supporting the first plane 111, the parallel surface portion 222 supports the second plane 112, thereby enabling the support 200 to more easily support the power generating element 110.

[0100] The bent portion 221 is a portion that applies an elastic force to the power generating element 110 in a direction perpendicular to the second plane 112. In this embodiment, the cross section of the bent portion 221 cut by a plane perpendicular to the first plane 111 and the second plane 112 (i.e., the zx plane) includes an L-shape. When the cross section of the bent portion 221 includes an L-shape, it is possible to exert a sufficient elastic force. The second support portion 220 may have a plurality of bent portions 221.

[0101] The bent portion 221 is a portion having a bent shape in the second support portion 220. The bent shape includes both a bent shape having no radius of curvature and a shape curved with a predetermined radius of curvature.

[0102] 3A, when a plurality of bent portions 221 having a cross-sectional shape including an L-shape are provided, the second support portion 220 may have a folded shape. In this case, the folded shape is a shape in which mountain folds and valley folds are repeated, so that the second support portion 220 has a bellows-folded shape.

[0103] In this manner, by providing the bent portion 221 in the second support portion 220, an elastic force can be applied to the power generating element 110 in a direction perpendicular to the second plane 112 (i.e., the stacking direction). In this embodiment, the second support portion 220 has the parallel surface portion 222, which contacts the second plane 112, and therefore the bent portion 221 can apply an elastic force to the second plane 112.

[0104] Here, a battery 1000x according to a comparative example will be described with reference to FIG. 3B.

[0105] The battery 1000x according to the comparative example includes a power generating element 110x and does not include a support. The power generating element 110x has the same configuration as the power generating element 110 according to the present embodiment. The power generating element 110x has a first plane 111x, a second plane 112x, and a third plane 113x. The battery 1000x is housed in a housing 400 and supported in contact with an upper surface portion 401 and a bottom surface portion 402.

[0106] In the battery 1000x, when the power generating element 110x expands, it deforms so as to extend in the positive z-axis direction and the negative z-axis direction. As a result, the power generating element 110x is pushed back from the top surface portion 401 and the bottom surface portion 402, that is, the pressure by the top surface portion 401 and the bottom surface portion 402 to support the power generating element 110x increases, so that peeling or cracking is more likely to occur in the power generating element 110x. In other words, the battery 1000x according to the comparative example has low reliability.

[0107] Battery 1000 according to this embodiment will be described again with reference to FIG. 3A.

[0108] As described above, stress due to expansion of the power generating element 110 occurs mainly in the stacking direction. Similarly, the bent portion 221 can impart elastic force in the stacking direction. By providing such a bent portion, even if the power generating element 110 expands, the pressure for supporting the power generating element 110 is unlikely to increase, so that peeling or cracking in the power generating element 110 can be suppressed.

[0109] In other words, by providing the support 200, the power generating element 110 can be easily supported and the occurrence of peeling or cracks in the power generating element 110 can be suppressed. As a result, a highly reliable battery 1000 can be obtained.

[0110] Furthermore, as described above, in the power generating element 110, a plurality of battery cells 101 are stacked.

[0111] In this way, stacking multiple battery cells 101 can increase the voltage or capacity of the battery 1000. On the other hand, in a battery 1000 including multiple battery cells 101, the thickness of the power generating element 110 is greater than in a battery including one battery cell 101. This increases the risk of the power generating element 110 being affected by deformation such as warping due to stress generated in the power generating element 110. Therefore, in such a battery 1000, technology for improving reliability becomes even more important.

[0112] The support 200 may protrude from the second plane 112 in a direction perpendicular to the second plane 112 (in the present embodiment, the negative direction of the z-axis). More specifically, a distance d3 by which the support 200 protrudes from the second plane 112 may be 1 mm or more and 10 mm or less. In other words, the protruding distance d3 is the distance between the power generating element 110 and the support surface (the bottom surface portion 402 of the housing).

[0113] In this way, by making the protruding distance d3 1 mm or more, a sufficient space is created around the power generating element 110 (specifically, between the power generating element 110 and the support surface). Therefore, even if the power generating element 110 expands, the second flat surface 112 of the power generating element 110 does not come into contact with a surrounding object (specifically, the support surface), and the second flat surface 112 does not receive pressure from the surrounding object (specifically, the support surface). Therefore, the occurrence of peeling or cracks in the power generating element 110 can be suppressed.

[0114] By setting the protruding distance d3 to 10 mm or less, unnecessary space around the power generating element 110 (specifically, between the power generating element 110 and the support surface) can be reduced, thereby preventing the battery 1000 from becoming large.

[0115] The material constituting the support 200 may be, for example, a metal or a resin, but is not particularly limited thereto. For example, the metal may be aluminum, stainless steel, titanium, nickel, copper, magnesium, or an alloy thereof. For example, the resin constituting the support 200 may be epoxy, polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylic, acrylonitrile, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyurethane, polyphenylene sulfide, polysulfone, polyethersulfone, polyarylate, polyetheretherketone, polyetherimide, polytetrafluoroethylene, perfluoroalkoxyalkane, polychlorotrifluoroethylene, polyvinylidene fluoride, or the like.

[0116] The support 200 may be formed of a plate member having a thickness d1 of 50 μm or more and 5000 μm or less. In this way, when the thickness d1 is 50 μm or more, the mechanical strength of the support 200 is improved. When the thickness d1 is 5000 μm or less, the formation of the bent portion 221 in the support 200 becomes easy.

[0117] The support 200 may be an electrode terminal. The electrode terminal serves to supply power. In this case, the support 200 is connected to one of the positive electrode layer and the negative electrode layer. In this embodiment, the second support portion 220 of the support 200 is connected to the negative electrode current collector 106 included in the negative electrode layer exposed to the second plane 112. When the support 200 is an electrode terminal, the support 200 may be made of the above-mentioned metal. In this case, no adhesive layer that inhibits electrical conduction is provided between the support 200 and the power generating element 110.

[0118] In this way, the support 200 supports the power generating element 110 and is electrically connected to the power generating element 110, so that no separate electrodes or the like are required, and therefore it is possible to prevent the battery from becoming large in size.

[0119] Furthermore, when the support 200 is made of metal, the surface of the support 200 may be covered with a resin. For example, the surface of the support 200 may be coated with a resin. The flexibility of the resin enhances the impact resistance against deformation of the power generating element, improving the adhesion between the first plane 111 and the first support part 210 and facilitating support. In other words, it is possible to impart high reliability to the battery 1000.

[0120] In this case, organic polymers such as polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polymethyl ester of acrylic acid, polyethyl ester of acrylic acid, polyhexyl ester of acrylic acid, polymethacrylic acid, polymethyl ester of methacrylic acid, polyethyl ester of methacrylic acid, polyhexyl ester of methacrylic acid, polyvinyl acetate, polyvinylpyrrolidone, polyether, polyethersulfone, hexafluoropolypropylene, and carboxymethyl cellulose can be used as the resin. Alternatively, various rubbers such as silicone rubber, chloroprene rubber, nitrile butadiene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, urethane rubber, fluororubber, polysulfide rubber, natural rubber, isoprene rubber, styrene butadiene rubber, butyl rubber, and butadiene rubber can be used.

[0121] In addition, the resin may be, for example, a conductive polymer at the portion where the support 200, which is an electrode terminal, and the power generating element 110 are connected. When the resin covering the support 200 functions as a current collector, it is expected that the rate characteristics will be improved. Polyacetylene, polyaniline, polypyrrole, polythiophene, or the like can be used as the conductive polymer.

[0122] For example, a conductive resin paste may be used at the portion where the support 200, which is an electrode terminal, is connected to the power generating element 110. The resin covering the support 200 has conductivity, and the flexibility of the resin improves impact resistance, thereby ensuring high reliability of the battery 1000.

[0123] Alternatively, the support 200, which is an electrode terminal, and the power generating element 110 may be connected by solder. Because the connections between the support 200, the solder, and the power generating element 110 are all between metal components, the wiring resistance is significantly reduced, and high rate characteristics are expected. By using the solder as a current collector, the current collector can be eliminated or made thin, thereby reducing the thickness of the power generating element 110. By reducing the thickness of the power generating element 110, the energy density of the power generating element 110 can be increased.

[0124] Furthermore, in the portion where the support 200, which is an electrode terminal, and the power generating element 110 are connected, the non-conductive material of the adhesive layer does not need to be provided.

[0125] However, when the support 200 is an electrode terminal, the following problems may occur.

[0126] As described above, the power generating element 110 expands so as to extend in the positive z-axis direction and the negative z-axis direction during charging and discharging. As a result, deformation such as warping occurs in the second plane 112 electrically connected to the support 200, which is the electrode terminal. This causes poor connection between the power generating element 110 and the electrode terminal (support 200), which leads to current concentration and a significant deterioration in the battery characteristics.

[0127] However, by providing the bent portion 221, the pressure applied to the electrode terminal (support 200) due to deformation such as warping of the power generating element 110 is alleviated. This reduces the effect of poor connection. This makes it possible to realize a battery 1000 in which current concentration is unlikely to occur in the power generating element 110. In other words, a highly reliable battery 1000 can be realized.

[0128] Even when the support 200 is an electrode terminal, the distance d3 by which the support 200 protrudes from the second plane 112 is preferably not less than 1 mm and not more than 10 mm.

[0129] In this way, by making the protruding distance d3 1 mm or more, it is possible to alleviate the stress on the electrode terminal (support 200) that occurs when the power generating element 110 is deformed (e.g., warped or otherwise deformed), thereby achieving a greater effect in preventing poor connections.

[0130] Furthermore, by setting the protruding distance d3 to 10 mm or less, the size of the electrode terminal is unlikely to become large, and an increase in wiring resistance can be sufficiently suppressed, improving the battery characteristics.

[0131] In the present embodiment, the second support part 220 is connected to the negative electrode current collector 106, but this is not limited thereto. For example, the first support part 210 may be connected to one of the positive electrode layer and the negative electrode layer. In this case, the positive electrode layer or a member electrically connected to the positive electrode layer may be exposed on the first plane 111, and the positive electrode layer or a member electrically connected to the positive electrode layer may be connected to the first support part 210, which is an electrode terminal. In this case, the insulating part 120 may not be provided.

[0132] At this time, the first support portion 210 may be in contact with the entire surface of the first plane 111.

[0133] In this way, the contact area between the first support part 210, which is an electrode terminal, and the power generating element 110 is increased, so that an increase in electronic resistance due to poor connection can be prevented.

[0134] Next, modified examples of the embodiment will be described. In the embodiment, an example has been shown in which second support part 220 has parallel surface part 222 and a plurality of L-shaped bent parts 221. However, this is not limited to this. The shapes of the second support part in Modifications 1 to 6 shown below are different from the shape of second support part 220 in the embodiment. The batteries in Modifications 1 to 6 will be described with reference to Figs. 4A and 4B.

[0135] Fig. 4A is a side view of the periphery of a second support part included in a battery according to Modifications 1 to 3 of the present embodiment. Fig. 4B is a side view of the periphery of a second support part included in a battery according to Modifications 4 to 6 of the present embodiment. Figs. 4A and 4B are side views of modified batteries corresponding to region IV of battery 1000 according to the present embodiment shown in Fig. 3A.

[0136] In the modified example, detailed description of components common to the embodiment will be omitted.

[0137] (Variation 1) Fig. 4A (a) is a diagram showing the periphery of the support 200a included in the battery 1000a of the first modification. The support 200a has a first support part 210 and a second support part 220a including a bent part 221a. In this modification, the cross-sectional shape of the bent part 221a cut by a plane perpendicular to the first plane 111 and the second plane 112 (i.e., the zx plane) includes a V-shape. As shown in Fig. 4A (a), the tip of the V-shape does not have to be sharp, and may be an arc shape.

[0138] By having the cut surface of the bent portion 221a have a V-shape, the bent portion 221a can exert a sufficient elastic force, and thus the occurrence of peeling or cracks in the power generating element 110 can be suppressed.

[0139] (Variation 2) 4A(b) is a diagram showing the periphery of a support 200b included in a battery 1000b of Modification 2. The support 200b has a first support part 210 and a second support part 220b including two bent parts 221b. In this modification, the cross-sectional shape of the bent part 221b cut by a plane perpendicular to the first plane 111 and the second plane 112 (i.e., the zx plane) includes an L-shape.

[0140] Even when two bent portions 221b are provided, the bent portions 221b can exert a sufficient elastic force, so that the occurrence of peeling or cracks in the power generating element 110 can be suppressed.

[0141] (Variation 3) FIG. 4A(c) is a diagram showing the periphery of the support 200c included in the battery 1000c of the third modification. The support 200c has a first support part 210 and a second support part 220c including a bent part 221c. In this modification, the cross-sectional shape of the bent part 221c cut by a plane perpendicular to the first plane 111 and the second plane 112 (i.e., the zx plane) includes a U-shape. As shown in FIG. 4A(c), the second support part 220c may have a folded shape.

[0142] The cut surface of the bent portion 221c has a U-shape, so that the bent portion 221c can exert a sufficient elastic force, thereby preventing the power generating element 110 from peeling off or cracking.

[0143] (Variation 4) 4B(a) is a diagram showing the periphery of the support 200 included in the battery 1000d of Modification Example 4. The support 200 has a first support portion 210 and a second support portion 220 including a bent portion 221. The second support portion 220 may also include a parallel surface portion 222.

[0144] In the embodiment, an example has been shown in which second support part 220 (more specifically, parallel surface part 222) is in contact with second plane 112. In this modified example, second support part 220 is separated from second plane 112. More specifically, parallel surface part 222 included in second support part 220 is separated from second plane 112. A separation space 230 is provided between parallel surface part 222 and second plane 112.

[0145] Therefore, even if the power generating element 110 expands, the second flat surface 112 of the power generating element 110 does not come into contact with the second support part 220, and the second flat surface 112 does not receive pressure from the second support part 220. This makes it possible to suppress the occurrence of peeling or cracks in the power generating element 110.

[0146] In other words, by providing such a support 200, the power generating element 110 can be easily supported, and the occurrence of peeling or cracks in the power generating element 110 can be suppressed.

[0147] (Variation 5) FIG. 4B (b) is a diagram showing the periphery of the support 200 included in the battery 1000e of the fifth modification. The support 200 has a first support portion 210 and a second support portion 220 including a bent portion 221. The second support portion 220 may include a parallel surface portion 222. The battery 1000e according to this modification further includes a resin member 240 located between the second support portion 220 and the second plane 112. More specifically, the resin member 240 is located between the parallel surface portion 222 included in the second support portion 220 and the second plane 112, and is in contact with the parallel surface portion 222 included in the second support portion 220 and the second plane 112. Thus, the second support portion 220 supports the power generating element 110 via the resin member 240.

[0148] The shape of the resin member 240 is a rectangular parallelepiped, but is not particularly limited as long as the resin member 240 can be positioned between and in contact with the parallel surface portion 222 included in the second support portion 220 and the second flat surface 112 .

[0149] The resin member 240 is made of a resin material. The resin material may be, for example, the material used for the support 200 described above, but is not limited to this. The resin material may be an elastomer material. The elastomer material is a material having elasticity, and examples of the elastomer material include, but are not limited to, a thermosetting elastomer and a thermoplastic elastomer.

[0150] In addition to the first support part 210 supporting the first plane 111, the second support part 220 supports the second plane 112 via the resin member 240, allowing the support 200 to more easily support the power generating element 110.

[0151] Next, a case where the resin member 240 is made of an elastomer material will be described. The resin member 240 imparts elasticity between the second flat surface 112 and the second support portion 220, so that even if the power generating element 110 expands, the pressure for supporting the power generating element 110 is unlikely to increase, and therefore peeling or cracking in the power generating element 110 can be suppressed.

[0152] (Variation 6) 4B(c) is a diagram showing the periphery of a support 200f included in a battery 1000f of Modification Example 6. The support 200f has a first support portion 210 and a second support portion 220f including a bent portion 221. The second support portion 220f may also include a parallel surface portion 222.

[0153] In this modification, the support 200f protrudes from the first plane 111 in the direction opposite the power generating element 110. The protruding distance d4 is, for example, 0.1 mm or more and 10 mm or less. The direction from the first plane 111 to the opposite side of the power generating element 110 is the negative direction of the x-axis.

[0154] As described above, the power generating element 110 mainly deforms so as to extend in the stacking direction, i.e., in the positive z-axis direction and the negative z-axis direction. However, the power generating element 110 also deforms slightly so as to extend in a direction perpendicular to the stacking direction, for example, in the positive x-axis direction and the negative x-axis direction. Therefore, by setting the protruding distance d4 to 0.1 mm or more, even if the power generating element 110 deforms so as to extend in a direction perpendicular to the stacking direction, the power generating element 110 is allowed to deform in the perpendicular direction. Therefore, the deformation of the power generating element 110 is mitigated, and the reliability of the battery 1000f is improved.

[0155] Furthermore, by making the protruding distance d4 smaller, the battery 1000f can be mounted in a smaller area. Therefore, by making the protruding distance d4 10 mm or less, the size of the battery 1000f is suppressed from increasing.

[0156] Here, a seventh modification of the embodiment will be further described with reference to FIG.

[0157] FIG. 5 is a side view of a battery 1000g according to this modification example when it is housed in a housing 400. As shown in FIG.

[0158] A battery 1000g according to this modification includes a power generating element 110, a first support, and a second support 300. In this modification, the first support has the same configuration as the support 200 described above, and therefore will be referred to as the first support 200 below.

[0159] The second support 300 is a member that supports the power generating element 110. The second support 300 has a first support portion 310 and a second support portion 320.

[0160] The first support portion 310 of the second support 300 has the same configuration as the first support portion 210 of the first support 200, but differs from the first support portion 210 only in that the first support portion 310 is in contact with the third plane 113. In other words, the first support portion 200 and the second support portion 300 each support opposing surfaces of the power generating element 110.

[0161] Further, the second support portion 320 of the second support 300 has the same configuration as the second support portion 220 of the first support 200. Specifically, the second support portion 320 includes a bent portion 321 and a parallel surface portion 322.

[0162] By the first support 200 and the second support 300 supporting the first plane 111, the second plane 112, and the third plane, the first support 200 and the second support 300 can more easily support the power generating element 110.

[0163] (Other embodiments) Although the battery according to the present disclosure has been described above based on the embodiment and each modified example, the present disclosure is not limited to these embodiment and each modified example. As long as it does not deviate from the gist of the present disclosure, various modifications conceived by a person skilled in the art to the embodiment and other forms constructed by combining some of the components in the embodiment and each modified example are also included in the scope of the present disclosure.

[0164] In the seventh modification, the first support 200 and the second support 300 each support opposing surfaces of the power generating element 110, but this is not limited thereto. For example, the battery may include three or more supports. The power generating element may have a rectangular shape in plan view (i.e., the shape of the power generating element when viewed in the negative z-axis direction). The three or more supports may support each side or corner of the rectangular shape of the power generating element in plan view.

[0165] In the embodiment and each modified example, the battery includes one power generating element, but is not limited to this. For example, the battery may include multiple power generating elements. In this case, for example, another power generating element different from the power generating element 110 of the embodiment may be provided on the positive side of the z axis of the power generating element 110. Also, a support may be provided between the power generating element 110 and the other power generating element.

[0166] In the embodiment and each modified example, the second support portion 220 is provided between the power generating element 110 and the bottom surface portion 402 of the housing 400, but this is not limited to the above. For example, the second support portion 220 may be provided between the power generating element 110 and the top surface portion 401 of the housing 400.

[0167] 2, the power generating element 110 is a series-connected battery cell having a structure in which the negative electrode current collector 106 and the positive electrode current collector 105 of adjacent battery cells 101 in the stacking direction are connected to each other, but the present invention is not limited to this. The power generating element may be a parallel-connected stacked battery having a structure in which the current collectors of the same pole of adjacent batteries in the stacking direction are connected to each other. Alternatively, the power generating element may be a stacked battery that combines direct connection and parallel connection, in which the current collectors of the same pole of the series-connected stacked batteries are connected to each other.

[0168] For example, in the above embodiment, the power generating element 110 is a series-connected power generating element having a structure in which the electrode current collector and the counter electrode current collector of adjacent battery cells 101 in the stacking direction are connected, but this is not limited thereto. The power generating element may be a parallel-connected power generating element having a structure in which the current collectors of the same polarity of adjacent batteries in the stacking direction are connected to each other. Also, the power generating element may be a combination of direct connection and parallel connection in which the current collectors of the same polarity of the series-connected power generating elements are connected to each other.

[0169] Furthermore, the above-described embodiment can be modified, substituted, added, omitted, and the like in various ways within the scope of the claims or their equivalents. [Industrial Applicability]

[0170] The battery of the present disclosure can be used, for example, as a lithium ion secondary battery (for example, an all-solid-state battery). [Explanation of symbols]

[0171] 101 Battery Cell 102 Positive electrode 103 Negative electrode 104 Solid electrolyte layer 105 Positive electrode current collector 106 Negative electrode current collector 110, 110x Power Generation Elements 111, 111x 1st plane 112, 112x 2nd plane 113, 113x 3rd plane 120 Insulation 200 Support, 1st support 200a, 200b, 200c, 200f support 210 First support part 220, 220a, 220b, 220c, 220f 2nd support part 221, 221a, 221b, 221c bends 222 Parallel plane part 230 Separate space 240 Resin parts 300 Second support 310 First support part 320 Second support part 321 Bend 322 Parallel plane part 400 cabinet 401 Top part 402 Bottom part d1 Thickness d2 Length d3 Projection distance d4 Projecting distance P direction in which stress occurs 1000, 1000a, 1000b, 1000c, 1000d, 1000e, 1000f, 1000g, 1000x batteries

Claims

1. a power generating element having a positive electrode layer, a negative electrode layer, and an electrolyte layer stacked together; a support for supporting the power generating element, the power generating element has a first plane that is a plane horizontal to the stacking direction and a second plane that is a plane perpendicular to the stacking direction, the support body has a first support body portion in contact with the first plane and a second support body portion including a bent portion that applies an elastic force to the power generating element in a direction perpendicular to the second plane, The support is an electrode terminal, The support is connected to one of the positive electrode layer and the negative electrode layer. battery.

2. The second support portion further includes a parallel surface portion extending parallel to the second plane, The parallel surface portion is in contact with the second plane.

10. The battery of claim 1.

3. The second support portion is spaced apart from the second plane.

10. The battery of claim 1.

4. The second support member is provided with a resin member located between the second support portion and the second plane. The battery of claim 1 or 3.

5. A power generating element having a laminated positive electrode layer, a negative electrode layer, and an electrolyte layer; a support for supporting the power generating element, the power generating element has a first plane that is a plane horizontal to the stacking direction and a second plane that is a plane perpendicular to the stacking direction, the support body has a first support body portion in contact with the first plane and a second support body portion including a bent portion that applies an elastic force to the power generating element in a direction perpendicular to the second plane, The first support portion is in contact with the entire surface of the first plane. battery.

6. A power generating element having a laminated positive electrode layer, a negative electrode layer, and an electrolyte layer; a support for supporting the power generating element, the power generating element has a first plane that is a plane horizontal to the stacking direction and a second plane that is a plane perpendicular to the stacking direction, the support body has a first support body portion in contact with the first plane and a second support body portion including a bent portion that applies an elastic force to the power generating element in a direction perpendicular to the second plane, The support body protrudes from the second plane in a direction perpendicular to the second plane by 1 mm to 10 mm. battery.

7. The support body protrudes from the first plane in a direction opposite to the power generating element by 0.1 mm to 10 mm. The battery according to any one of claims 1 to 6.

8. The support is made of a plate member having a thickness of 50 μm or more and 5000 μm or less. The battery according to any one of claims 1 to 7.

9. The electrolyte layer is a solid electrolyte layer. The battery according to any one of claims 1 to 8.

10. The power generating element includes a plurality of stacked battery cells, Each of the plurality of battery cells includes the positive electrode layer, the negative electrode layer, and the electrolyte layer. The battery according to any one of claims 1 to 9.

11. The cross-sectional shape of the bent portion cut by a plane perpendicular to the first plane and the second plane includes a U-shape, a V-shape, or an L-shape. The battery according to any one of claims 1 to 10.

Images