All-solid-state battery

Abstract

An all-solid-state battery includes a case composed of an electrically insulating material, an all-solid-state battery element housed within the case, and an electrically insulating resin positioned within the case and covering at least a portion of the battery element. The all-solid-state battery element comprises a first external electrode and a second external electrode, wherein the first external electrode includes a first end embedded in the electrically insulating resin and a second end exposed outside the resin, while the second external electrode includes a third end embedded in the electrically insulating resin and a fourth end exposed outside the resin.

Description

ALL-SOLID-STATE BATTERY

[0001] The present disclosure relates to an all-solid-state battery.

[0002] Recently, as portable electronic devices are required to be down-sized and used for a long term, high-capacity batteries are required, and safety of batteries is required due to the popularization of wearable electronic devices.

[0003] Since currently commercially available lithium ion batteries use an electrolyte containing a flammable organic solvent, there is a possibility of overheating and fire when a short circuit occurs. Accordingly, an all-solid-state battery utilizing a solid electrolyte instead of a liquid electrolyte has been proposed.

[0004] All-solid-state batteries may expand as the volume of electrode active material layers changes during charge and discharge. Within an expanded all-solid-state battery, electrodes may break or the bonding at an electrode-solid electrolyte interface may be damaged, resulting in poor contact, which may deteriorate battery characteristics, especially, charge and discharge cycle characteristics. Furthermore, the difference in the expansion rate of the electrode and solid electrolyte can cause cracks to form in the all-solid-state battery, allowing moisture to penetrate.

[0005] The present disclosure aims to provide an all-solid-state battery capable of suppressing expansion.

[0006] The present disclosure aims to provide an all-solid-state battery capable of preventing moisture inflow.

[0007] However, the objective of the present disclosure may be not limited to the aforementioned one, and may be extended in various ways within the spirit and scope of the present disclosure.

[0008] An all-solid-state battery may include a case with electrical insulation, an all-solid-state battery element accommodated within the case and including a first external electrode and a second external electrode, and an electrically insulating resin covering at least a portion of the all-solid-state battery element and accommodated within the case, where the first external electrode may include a first end embedded in the electrically insulating resin and a second end exposed from the electrically insulating resin, and where the second external electrode may include a third end embedded in the electrically insulating resin and a fourth end exposed from the electrically insulating resin.

[0009] At least a portion of the all-solid-state battery element may be spaced from an interior surface of the case.

[0010] The electrically insulating resin may fill the space between the all-solid-state battery element and the interior surface of the case.

[0011] A protruding portion may be disposed on an interior surface of the case.

[0012] The protruding portion may be in contact with the all-solid-state battery element.

[0013] The protruding portion may include a plurality of stripe patterns.

[0014] The all-solid-state battery element may include a laminate including a plurality of solid electrolyte layers, a plurality of positive electrode layers, and a plurality of negative electrode layers that are stacked in a first direction, the first external electrode may be disposed outside of the laminate and electrically connected to the plurality of positive electrode layers, and the second external electrode may be disposed outside of the laminate and electrically connected to the plurality of negative electrode layers.

[0015] An all-solid-state battery may further include a first conductive bonding member between the first external electrode and the plurality of positive electrode layers, and a second conductive bonding member between the second external electrode and the plurality of negative electrode layers.

[0016] The first conductive bonding member and the second conductive bonding member may contain silver (Ag).

[0017] The electrically insulating resin may cover an outer surface of the all-solid-state battery element that intersects the first direction.

[0018] The electrically insulating resin may extend outward from the case in the first direction.

[0019] The second end of the first external electrode may be exposed from the electrically insulating resin in the first direction, and the fourth end of the second external electrode may be exposed from the electrically insulating resin in the first direction.

[0020] The case may include a polymeric resin.

[0021] The electrically insulating resin may include an epoxy molding compound (EMC).

[0022] In an embodiment, the all-solid-state battery can suppress expansion during charging and discharging. In an embodiment, the all-solid-state battery can prevent moisture ingress.

[0023] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to an embodiment.

[0024] FIG. 2 is a schematic exploded perspective view of FIG. 1.

[0025] FIG. 3 is a schematic top plan view of FIG. 1.

[0026] FIG. 4 is a cross-sectional view along line I-I' of FIG. 1.

[0027] FIG. 5 is a perspective view schematically illustrating the all-solid-state battery element of FIG. 1.

[0028] FIG. 6 is a perspective view schematically illustrating a laminate of the all-solid-state battery element of FIG. 5.

[0029] FIG. 7 is a cross-sectional view along line II-II' of FIG. 5.

[0030] FIG. 8 is an exploded perspective view schematically illustrating the internal structure of the laminate of FIG. 6.

[0031] FIG. 9 is a partial cross-sectional view schematically illustrating a positive electrode layer of the all-solid-state battery element of FIG. 5.

[0032] FIG. 10 is a partial cross-sectional view schematically illustrating a negative electrode layer of the all-solid-state battery element of FIG. 5.

[0033] FIG. 11 is a perspective view schematically illustrating an all-solid-state battery according to another embodiment.

[0034] FIG. 12 is an exploded perspective schematic view of FIG. 11.

[0035] FIG. 13 is a top plan schematic view of FIG. 11.

[0036] FIG. 14 is a cross-sectional view along line III-III' of FIG. 13.

[0037] The present disclosure will be described in greater detail hereinafter with reference to the accompanying drawings, which illustrate embodiments of the disclosure. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification. Additionally, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated, and the size of each component does not fully reflect the actual size.

[0038] The accompanying drawings are provided solely to facilitate an understanding of the embodiments disclosed in the present specification to be easily understood and are not to be interpreted as limiting the spirit disclosed in the present specification, and it is to be understood that the present disclosure includes all modifications, equivalents, and substitutions without departing from the scope and spirit of the present disclosure.

[0039] Terms including ordinal numbers such as first, second, and the like will be used only to describe various components, and are not to be interpreted as limiting these components. The terms serve only toto differentiate one component from other components.

[0040] It will be understood that when an element such as a layer, film, region, area, or substrate is referred to as being "on" or "above" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Further, in the specification, the word "on" or "above" means disposed on or below the object portion, and does not necessarily mean disposed on the upper side of the object portion based on a gravitational direction.

[0041] Throughout the specification, it should be understood that the term "include", "comprise", "have", or "configure" indicates that a feature, a number, a step, an operation, a component, a part, or a combination thereof described in the specification is present, but does not exclude a possibility of presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations, in advance. Unless explicitly stated otherwise, the term "comprise" and its variations, such as "comprises" or "comprising," imply the inclusion of stated elements without excluding other elements.

[0042] Further, throughout the specification, the phrase "in a plan view" or "on a plane" means viewing a target portion from the top, and the phrase "in a cross-sectional view" or "on a cross-section" means viewing a cross-section formed by vertically cutting a target portion from the side.

[0043] Furthermore, throughout the specification, "connected" does not only mean when two or more elements are directly connected, but also when two or more elements are indirectly connected through other elements, and when they are physically connected or electrically connected, and further, it may be referred to by different names depending on a position or function, and may also be referred to as a case in which respective parts that are substantially integrated are linked to each other.

[0044] FIG. 1 is a perspective view schematically showing an all-solid-state battery according to an embodiment, and FIG. 2 is a schematic exploded perspective view of FIG. 1, and FIG. 3 is a schematic top plan view of FIG. 1. Additionally, FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 1, and FIG. 5 is a perspective view schematically showing the all-solid-state battery element of FIG. 1, and FIG. 6 is a perspective view schematically showing a laminate of the all-solid-state battery element of FIG. 5.

[0045] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6, an all-solid-state battery 1000 may include an all-solid-state battery element 1100, a case 1200, and an electrically insulating resin 1300.

[0046] The all-solid-state battery element 1100 may include a laminate 100, a first external electrode 200, a second external electrode 300, a first conductive bonding member 400, and a second conductive bonding member 500.

[0047] First, as for directions defined for describing the present embodiment, an L-axis, a W-axis, and a T-axis shown in the drawings indicate axes indicating a length direction, a width direction, and a thickness direction of the all-solid-state battery element 1100, respectively.

[0048] The thickness direction (T-axis direction) is perpendicular to the wide surfaces (i.e., major surfaces) of sheet-shaped components. For example, the thickness direction (T-axis direction) may be used as the same concept as a direction in which the components of the laminate 100 are stacked.

[0049] The length direction (L-axis direction) is a direction parallel to the wide surfaces (major surfaces) of sheet-shaped components, and may be a direction intersecting (or orthogonal to) the thickness direction (T-axis direction). For example, the length direction (L-axis direction) may be a direction in which the first external electrode 200 and the second external electrode 300 oppose each other.

[0050] The width direction (W-axis direction) is a direction parallel to the wide surfaces (major surfaces) of sheet-shaped components, and may be a direction simultaneously intersecting (or orthogonal to) the thickness direction (T-axis direction) and the length direction (L-axis direction).

[0051] The laminate 100 may have a substantially hexahedral shape, but the present embodiment is not limited thereto. Due to shrinkage during sintering, the laminate 100 may not have a perfect hexahedral shape, but it may have a substantially hexahedral shape. For example, the laminate 100 may have a generally rectangular hexahedral shape, but corners or vertex portions thereof may have a round shape.

[0052] In the present embodiment, for convenience of description, surfaces opposing each other in the length direction (L-axis direction) of the laminate 100 may be defined as a first surface S1 and a second surface S2, surfaces opposing each other in the width direction (W-axis direction) of the laminate 100 and connecting the first surface S1 and the second surface S2 may be defined as a third surface S3 and a fourth surface S4, and surfaces opposing each other in the thickness direction (T-axis direction) of the laminate 100 and connecting the first surface S1 and the second surface S2 may be defined as a fifth surface S5 and a sixth surface S6.

[0053] Therefore, a first direction, which is a direction in which the first surface S1 and the second surface S2 oppose each other may be the length direction (L-axis direction), and a second direction and a third direction perpendicular to the first direction and perpendicular to each other may be the thickness direction (T-axis direction) and the width direction (W-axis direction) or the width direction (W-axis direction) and the thickness direction (T-axis direction).

[0054] A length of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at a central portion of the laminate 100 in the width direction (W-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the length direction (L-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the length direction (L-axis direction). Conversely, the length of the laminate 100 may mean, a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the length direction (L-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the length direction (L-axis direction). Alternatively, the length of the laminate 100 may mean an arithmetic average value of lengths of at least two line segments among a plurality of line segments that connect two outermost boundary lines opposing each other in the length direction (L-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the length direction (L-axis direction).

[0055] A thickness of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at the central portion of the laminate 100 in the width direction (W-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the thickness direction (T-axis direction). Conversely, the thickness of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the thickness direction (T-axis direction). Alternatively, the thickness of the laminate 100 may mean an arithmetic average value of lengths of at least two line segments among a plurality of line segments that connect two outermost boundary lines opposing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the thickness direction (T-axis direction).

[0056] A width of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section in the length direction (L-axis direction)-the width direction (W-axis direction) at a central portion of the laminate 100 in the thickness direction (T-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the width direction (W-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the width direction (W-axis direction). Conversely, the width of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines opposing each other in the width direction (W-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the width direction (W-axis direction). Alternatively, the width of the laminate 100 may mean an arithmetic average value of lengths of at least two line segments among a plurality of line segments that connect two outermost boundary lines opposing each other in the width direction (W-axis direction) of the laminate 100 shown in the above-described cross-sectional photograph, respectively, and are parallel to the width direction (W-axis direction).

[0057] FIG. 7 is a cross-sectional view taken along line II-II' of FIG. 5, and FIG. 8 is an exploded perspective view schematically showing the internal structure of the laminate of FIG. 6.

[0058] Referring to FIG. 6, FIG. 7 and FIG. 8, the laminate 100 may include a solid electrolyte layer 110, a positive electrode layer 130, a negative electrode layer 150, an upper protective layer 160, a lower protective layer 170 and a margin layer 180.

[0059] The solid electrolyte layer 110, the positive electrode layer 130 and the negative electrode layer 150 may each be plural. The positive electrode layer 130 and the negative electrode layer 150 may be alternately stacked in the thickness direction (T-axis direction) interposing the solid electrolyte layer 110 therebetween. This stacking structure may be repeated within the laminate 100. The electrode layer closest to the fifth surface S5 of the laminate 100 may be either the positive electrode layer 130 or the negative electrode layer 150, while the electrode layer closest to the sixth surface S6 may be either the negative electrode layer 150 or the positive electrode layer 130.

[0060] The positive electrode layer 130 may be disposed on one surface of the solid electrolyte layer 110, and the negative electrode layer 150 may be disposed on the other surface of the solid electrolyte layer 110.

[0061] The solid electrolyte layer 110 may include a solid electrolyte. The solid electrolyte may serve as a passage of lithium (Li) ions.

[0062] The solid electrolyte included in the solid electrolyte layer 110 may include a glass-ceramic-based electrolyte including lithium halide (LiX, X = halogen element such as F, Br, Cl, I, or the like). The glass-ceramic (or crystallization glass) refers to a crystallographic mixture of amorphous and crystalline materials from which peaks and halos are observed in X-ray diffraction, electron beam diffraction, etc. Thus, the glass-ceramic-based electrolyte is an electrolyte that has undergone partial crystallization through sintering and in which amorphous and crystalline materials are mixed.

[0063] The glass-ceramic-based electrolyte may include a mixture of an amorphous material and two or more types of crystalline materials. In addition, the crystalline material included in the glass-ceramic-based electrolyte may include a lithium compound crystalline phase containing lithium.

[0064] When the glass-ceramic-based electrolyte is part of the solid electrolyte layer 110, sufficient densification is achieved after sintering, whereby it is possible to realize high ionic conductivity.

[0065] As an example, the glass-ceramic electrolyte may include lithium (Li) oxide, boron (B) oxide, silicon (Si) oxide, aluminum (Al) oxide, gallium (Ga) oxide, phosphorus (P) oxide, germanium (Ge) oxide, magnesium (Mg) oxide and lithium chloride (LiCl). In one specific example, the glass-ceramic electrolyte may include an aluminum-doped lithium chloroboracite-based electrolyte. In another specific example, the glass-ceramic electrolyte may include Li2O-B2O3-LiCl-Al2O3or Li4B4Al3O12Cl.

[0066] In another example, the solid electrolyte in the solid electrolyte layer 110 may contain a lithium-borosilicate-based electrolyte (hereinafter, referred to as LBSO-based electrolyte). The LBSO-based electrolyte is a glass-state electrolyte, and glass refers to a crystallographically amorphous material, from which halos are observed in the X-ray diffraction or electron beam diffraction.

[0067] When the LBSO-based electrolyte is part of the solid electrolyte layer 110, it is possible to keep the amorphous state during sintering while lowering the sintering temperature.　 Thus, there is an advantage that it is possible to realize high ionic conductivity, and reactivity with the electrode is not high. The LBSO-based electrolyte may include lithium (Li), boron (B), silicon (Si), aluminum (Al), phosphorus (P), germanium (Ge), and sulfur (S).

[0068] Alternatively, the solid electrolyte included in the solid electrolyte layer 110 may be one or more types selected from the group consisting of a Garnet-type, a Na super ionic conductor (NASICON)-type, a lithium super ionic conductor (LISICON)-type, a Perovskite-type, and a lithium phosphorus oxynitride (LiPON)-type.

[0069] The Garnet-type solid electrolyte may refer to lithium lanthanum zirconium oxide (LLZO) represented by LiaLabZrcO12such as Li7La3Zr2O12, and the NASICON-type solid electrolyte may include lithium-aluminum-titanium-phosphate (LATP) of Li1+xAlxTi2-x(PO4)3(wherein 0<x<1) produced by introducing Ti to Li1+xAlxM2-x(PO4)3(LAMP) (wherein 0<x<2, M is Zr, Ti, or Ge)-type compound, lithium-aluminum-germanium-phosphate (LAGP) represented by Li1+xAlxGe2-x(PO4)3(wherein 0<x<1), such as Li1.3Al0.3Ge1.7(PO4)3containing an excessive amount of lithium, and / or lithium-zirconium-phosphate (LZP) of LiZr2(PO4)3.

[0070] Additionally, the LISICON-type solid electrolyte may include solid solution oxide represented by xLi3AO4-(1-x)Li4BO4(wherein A is P, As, V, etc., and B is Si, Ge, Ti, etc.), such as Li4Zn(GeO4)4, Li10GeP2O12(LGPO), Li3.5Si0.5P0.5O4, and Li10.42Si(Ge)1.5P1.5Cl0.08O11.92, etc., and solid solution sulfide represented by Li4-xM1-yM'yS4(wherein M is Si or Ge and M' is P, Al, Zn, or Ga), such as Li2S-P2S5, Li2S-SiS2, Li2S-SiS2-P2S5, or Li2S-GeS2.

[0071] Furthermore, the Perovskite-type solid electrolyte may include lithium lanthanum titanate (LLTO) represented by Li3xLa2 / 3-x□1 / 3-2xTiO3(wherein 0<x<0.16, and □ is vacancy), such as Li1 / 8La5 / 8TiO3, and the LiPON-type solid electrolyte may include nitride such as lithium phosphorous oxynitride of Li2.8PO3.3N0.46.

[0072] The positive electrode layer 130 may be exposed outside of the laminate 100 from the first surface S1, and may be connected to the first external electrode 200.

[0073] FIG. 9 is a partial cross-sectional view schematically illustrating a positive electrode layer of the all-solid-state battery element of FIG. 5.

[0074] Referring to FIG. 7, FIG. 8 and FIG. 9, the positive electrode layer 130 may include a positive electrode current collector 133, a first positive electrode active material layer 135 and a second positive electrode active material layer 136.

[0075] The positive electrode current collector 133 may be made of, for example, a plate-shaped member or thin member. As another example, the positive electrode current collector 133 may be a porous body having a reticulate shape, a mesh shape, or the like.

[0076] The positive electrode current collector 133 may include a first surface 133a and a second surface 133b. The first surface 133a and the second surface 133b may oppose each other in the thickness direction (T-axis direction).

[0077] The positive electrode current collector 133 may include, but is not limited to, a porous metal plate made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof.

[0078] In addition, the positive electrode current collector 133 may be coated with an oxidation-resistant metal or an oxidation-resistant alloy film in order to prevent oxidation.

[0079] The positive electrode current collector 133 may include a carbon-based plate-shaped, thin, or linear member. The positive electrode current collector 133 may include a conductive carbon material. The conductive carbon material may include graphite, conductive fiber such as carbon nanotube (CNT) or vapor grown carbon fiber (VGCF), or conductive carbon such as carbon black.

[0080] Additionally, the positive electrode current collector may also include one or more types of solid electrolytes.

[0081] The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may include a positive electrode active material, and may be disposed on a surface of the positive electrode current collector 133. The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may be formed by printing a positive electrode active material on one or both surfaces of the positive electrode current collector 133, but the method of forming the positive electrode active material layer is not limited thereto.

[0082] The positive electrode active material included in the positive electrode active material layers 135 and 136 may comprise a material containing lithium (Li) ions. The positive electrode active material may reversibly intercalate and deintercalate lithium ions. In other words, the positive electrode active material may contain lithium ions and may serve to provide the lithium ions to the negative electrode when the all-solid-state battery is charging. The positive electrode active material may affect the capacity and output of an all-solid-state battery.

[0083] For example, the positive electrode active material may comprise at least one selected from the group consisting of compounds represented by the following formula: LiaAl-bMbD2(where, 0.90≤a≤1.8, 0≤b≤0.5); LiaEl-bMbO2-cDc(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); LiE2-bMbO4-cDc(where, 0≤b≤0.5, 0≤c≤0.05); LiaNi1-b-cCobMcDα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); LiaNi1-b-cCobMcO2-αXα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNi1-b-cCobMcO2-αX2(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05,0<α<2); LiaNi1-b-cMnbMcDα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); LiaNi1-b-cMnbMcO2-αXα(where,0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNi1-b-cMnbMcO2-αX2(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNibEcGdO2(where, 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1); LiaNibCocMndGeO2(where,0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1); LiaNiGbO2(where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaCoGbO2(where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaMnGbO2 (where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaMn2GbO4(where, 0.90≤a≤1.8, 0.001≤b≤0.1); QO2; QS2; LiQS2; V2O5; LiV2O2; LiRO2; LiNiVO4; Li(3-f)J2(PO4)3(0≤f≤2); Li(3-f)Fe2(PO4)3(where, 0≤f≤2); and LiFePO4, in the above formula, A is Ni, Co, or Mn; M is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, Nb, Ti, or a rare-earth element; D is O, F, S, or P; E is Co or Mn; X is F, S, or P; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, or V; Q is Ti, Mo, or Mn; R is Cr, V, Fe, Sc, or Y; J is V, Cr, Mn, Co, Ni, or Cu.

[0084] The positive electrode active material may also comprise LiCoO2, LiMnxO2x(where, x is 1 or 2), LiNi1-xMnxO2x(where, 0<x<1), LiNi1-x-yCoxMnyO2(where, 0≤x≤0.5, 0≤y≤0.5), LiFePO4, TiS2, FeS2, TiS3, or FeS3, but is not limited thereto.

[0085] The positive electrode active material may optionally contain a conductive material and a binder. However, because an organic substance such as a binder decomposes during sintering process, the organic material may not remain on the positive electrode active material layer of the obtained positive electrode current collector.

[0086] The conductive material is not particularly limited as long as it has conductivity without causing chemical changes in the all-solid-state battery 1000. For example, graphite such as natural graphite and artificial graphite; carbon-based materials such as carbon black, acetylene black, Ketjenblack®, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers, metal fibers, etc.; carbon fluoride; metal components such as lithium (Li), tin (Sn), aluminum (Al), nickel (Ni), copper (Cu), etc., oxides thereof, nitrides thereof, or fluorides thereof; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc., may be used.

[0087] The binder may be used to enhance the bonding strength between the active material and the conductive material. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluorine rubber, various copolymers, etc.

[0088] Additionally, the positive electrode layer 130 may further contain a solid electrolyte component. The solid electrolyte component may comprise one or more of the above-described components and may serve as an ionic conduction channel in the positive electrode layer. Therefore, it is possible to reduce interface resistance.

[0089] The negative electrode layer 150 may be exposed outside of the laminate 100 from the second surface S2, and may be connected to the second external electrode 300.

[0090] FIG. 10 is a partial cross-sectional view schematically showing a negative electrode layer of the all-solid-state battery element of FIG. 5.

[0091] Referring to FIG. 7, FIG. 8 and FIG. 10, the negative electrode layer 150 may include a negative electrode current collector 153, a first negative electrode active material layer 155 and a second negative electrode active material layer 156.

[0092] The negative electrode current collector 153 may be made of, for example, a plate-shaped member or thin member. Alternatively, the negative electrode current collector 153 may include a porous body having a reticulate shape, a mesh shape, or the like.

[0093] The negative electrode current collector 153 may include a first surface 153a and a second surface 153b. The first surface 153a and the second surface 153b may oppose each other in the thickness direction (T-axis direction).

[0094] For example, the negative electrode current collector 153 may include, but not limited to, a porous metal plate made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof.

[0095] Additionally, the negative electrode current collector 153 may be coated with an oxidation-resistant metal or an oxidation-resistant alloy film in order to prevent oxidation.

[0096] The negative electrode current collector 153, like the positive electrode current collector 133, may include a conductive carbon-based material and one or more types of solid electrolytes. The negative electrode current collector 153 may be identical to the negative electrode active material layers 155 and 156.

[0097] The first negative electrode active material layer 155 and the second negative electrode active material layer 156 may include a negative electrode active material, and may be disposed on a surface of the negative electrode current collector 153. The first negative electrode active material layer 155 and the second negative electrode active material layer 156 may be formed by printing the negative electrode active material on one or both surfaces of the negative electrode current collector 153, but the method of forming the negative electrode active material layer is not limited thereto.

[0098] The negative electrode active material included in the negative electrode active material layers 155 and 156 may store the lithium ions that have moved from the positive electrode and release the lithium ions when the all-solid-state battery is discharged, thereby generating electrical energy. A carbon-based material, silicon, a silicon oxide, a silicon-based alloy, a silicon-carbon-based material composite, tin, a tin-based alloy, a tin-carbon composite, a metal oxide, or a combination thereof may be used as the negative electrode active material. The negative electrode active material may contain a lithium metal and / or a lithium metal alloy.

[0099] The lithium metal alloy may contain lithium, and a metal / metalloid capable of making an alloy with lithium. For example, the metal / metalloid capable of forming an alloy with lithium may include Si, Sn, Al, Ge, Pb, Bi, Sb, and Si-AM alloy (wherein AM is an alkali metal, an alkaline earth metal, an element in group 13 to 16, a transition metal, a rare-earth element, or a combination thereof, and does not include Si), Sn-AM alloys (wherein AM is an alkali metal, an alkaline earth metal, an element in group 13 to 16, a transition metal, a transition metal oxide such as lithium titanium oxide (Li4Ti5O12), a rare-earth element, or combinations thereof, and does not include Sn), MnOx(wherein 0<x≤2), and the like.

[0100] The element AM may include Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Tl, Ge, P, As, Sb, Bi, S, Se, Te, Po, or combinations thereof.

[0101] Additionally, the oxide of the metal / metalloid capable of forming an alloy with lithium may include lithium titanium oxide, vanadium oxide, lithium vanadium oxide, SnO2, SiOx(wherein 0<x<2), or the like. For example, the negative electrode active material may comprise one or more elements selected from group 13 to 16 of the periodic table. For example, the negative electrode active material may contain one or more elements selected from the group consisting of Si, Ge, and Sn.

[0102] The carbon-based material may include crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon may be graphite such as natural graphite or artificial graphite that is in a shapeless, disc-shaped, flake-shaped, globular, or fibrous form. In addition, the amorphous carbon may include, but not limited to, soft carbon (low-temperature calcined carbon), hard carbon, mesophase pitch carbide, calcined cokes, graphene, carbon black, fullerene soot, carbon nanotube, carbon fiber, etc.

[0103] The silicon may include at least one selected from the group consisting of Si, SiOx(wherein 0<x<2, for example, 0.5 to 1.5), Sn, SnO2, or silicon-containing metal alloy, and mixtures thereof. For example, the silicon-containing metal alloy may include silicon, and one or more of Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb, or Ti.

[0104] The negative electrode active material may optionally include a conductive material and a binder.

[0105] The conductive material is not particularly limited as long as it provides conductivity without causing chemical changes in the all-solid-state battery 1000. For example, graphite such as natural graphite and artificial graphite; carbon-based materials such as carbon black, acetylene black, Ketjenblack®, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers, metal fibers, etc.; carbon fluoride; metal components such as lithium (Li), tin (Sn), aluminum (Al), nickel (Ni), copper (Cu), etc., oxides thereof, nitrides thereof, or fluorides thereof; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc., may be used.

[0106] The binder may be used to improve the bonding strength of the active material, the conductive material, or the like. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluorine rubber, various copolymers, etc.

[0107] Additionally, the negative electrode layer 150 may further contain a solid electrolyte component. The solid electrolyte component may contain one or more of the above-described components and may serve as an ionic conduction channel in the negative electrode layer. Thus, interface resistance can be reduced.

[0108] Referring to FIG. 7, the upper protective layer 160 and the lower protective layer 170 may be outermost layers disposed on the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively. That is, the upper protective layer 160 may be the outermost layer of the laminate 100 toward the fifth surface S5, and the lower protective layer 170 may be the outermost layer of the laminate 100 toward the sixth surface S6. The upper protective layer 160 and the lower protective layer 170 may improve moisture resistance by preventing moisture penetration, and may prevent damage from physical and chemical impacts.

[0109] The upper protective layer 160 and the lower protective layer 170 may be insulation layers made of an insulating material, that is, a material that is not electrically (ionically) conductive.

[0110] The upper protective layer 160 and the lower protective layer 170 may include a ceramic material, for example, alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), nitride gallium (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), a mixture thereof, oxides and / or nitrides of these materials, or any other appropriate ceramic material, but is not limited thereto. In addition, the upper protective layer 160 and the lower protective layer 170 may selectively include the above-described solid electrolyte, and may include one or more types of solid electrolytes, but is not limited thereto.

[0111] Referring to FIG. 7 and FIG. 8, the margin layer 180 may be disposed along the edges of the positive electrode layer 130 and the negative electrode layer 150. The margin layer 180 may be disposed to be in contact with the remaining edges of the positive electrode layer 130, except where the positive electrode layer 130 is connected to the first conductive bonding member 400. In addition, the margin layer 180 may be disposed to be in contact with the remaining edges of the negative electrode layer 150, except where the negative electrode layer 150 is connected to the second conductive bonding member 500.

[0112] For example, the margin layer 180 may be positioned on the solid electrolyte layer 110 in a region other than the region where the positive electrode layer 130 or the negative electrode layer 150 is disposed. When the positive electrode layer 130 is disposed on the solid electrolyte layer 110, the margin layer 180 may be disposed in a region other than the region where the positive electrode layer 130 is disposed. Likewise, when the negative electrode layer 150 is disposed on the solid electrolyte layer 110, the margin layer 180 may be disposed in a region other than the region where the negative electrode layer 150 is disposed.

[0113] Referring to FIG. 7, the margin layer 180 may comprise a portion of the first surface S1 and a portion of the second surface S2 of the laminate 100. Meanwhile, although not shown in the drawings, the margin layer 180 may comprise a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0114] The margin layer 180 may be disposed to compensate for a level difference between the solid electrolyte layer 110 and the positive electrode layer 130 and a level difference between the solid electrolyte layer 110 and the negative electrode layer 150. For example, the margin layer 180 may be disposed on the same surface as the positive electrode layer 130 and the negative electrode layer 150. The margin layer 180 may compensate for a level difference between the solid electrolyte layer 110 and the positive electrode layer 130 or a level difference between the solid electrolyte layer 110 and the negative electrode layer 150. This increases the density between the solid electrolyte layer 110 and the electrode layers, which may prevent interlayer delamination or warping caused by sintering during a process of manufacturing the all-solid-state battery.

[0115] Meanwhile, the margin layer 180 may be formed of a material that is resistant to moisture and has low lithium (Li) ion conductivity. In this case, the margin layer 180 may protect the active material layers 135, 136, 155, and 156 from moisture infiltration, lithium (Li) ion leakage, or the like. For example, the margin layer 180 may include an insulating material or electrolyte material, and may include a material with an ionic conductivity of 1.0x10-10S / cm or less.

[0116] The margin layer 180 may be made of an insulating material, i.e., a material that is not electrically (ionically) conductive.

[0117] The margin layer 180 may include, but not limited to, at least one selected from the group consisting of ceramic materials, such as alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), nitride gallium (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), a mixture thereof, oxides thereof and / or nitrides thereof, or any other suitable ceramic material.

[0118] Additionally, the margin layer 180 may optionally contain a solid electrolyte that is either the same as or different from the solid electrolyte in the aforementioned solid electrolyte layer and may comprise one or more types of solid electrolytes.

[0119] In addition, a material having a low ionic conductivity and electrical conductivity, such as an insulating material, may be present in the margin layer 180, or a material having an ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of a solid electrolyte may be present in the margin layer 180. For example, when a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte is present in the margin layer, the material may be a material that is identical to or different from the solid electrolyte in other regions. In another example, a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte and an insulating material may coexist in the margin layer.

[0120] Referring to FIG. 2, FIG. 3, and FIG. 4, the case 1200 may accommodate the all-solid-state battery element 1100. That is, the all-solid-state battery element 1100 may be mounted in an inner space of the case 1200.

[0121] The case 1200 may be fabricated by machining a plate, and may be formed by joining plates, but the present embodiment is not limited thereto.

[0122] The case 1200 may include a bottom portion 1210, a side wall portion 1220, and an open portion 1230. For example, the case 1200 may have a rectangular hexahedral shape with one side open. However, since the present embodiment is not limited thereto, the case 1200 may have a variety of shapes, such as a cylinder, a hexagonal column, or the like.

[0123] The bottom portion 1210 may be a portion in contact with the all-solid-state battery element 1100 in the thickness direction (T-axis direction). The all-solid-state battery element 1100 may be disposed in an interior surface of the bottom portion 1210. Accordingly, the sixth surface S6 of the all-solid-state battery element 1100 may be in contact with the bottom portion 1210 of the case 1200.

[0124] The side wall portion 1220 may be a portion extending from an edge of the bottom portion 1210 in the thickness direction (T-axis direction).

[0125] The side wall portion 1220 may include a first side wall portion 1221, a second side wall portion 1222, a third side wall portion 1223, and a fourth side wall portion 1224.

[0126] The first side wall portion 1221 and the second side wall portion 1222 may disposed opposite each other in the length direction (L-axis direction).

[0127] The first side wall portion 1221 may face the first external electrode 200 of the all-solid-state battery element 1100 in the length direction (L-axis direction). For example, the first side wall portion 1221 may be spaced apart from the first external electrode 200. In this case, the region between the first side wall portion 1221 and the first external electrode 200 may be filled with the electrically insulating resin 1300.

[0128] In other embodiments, the first side wall portion 1221 may be in contact with the first external electrode 200.

[0129] The second side wall portion 1222 may face the second external electrode 300 of the all-solid-state battery element 1100 in the length direction (L-axis direction). For example, the second side wall portion 1222 may be spaced apart from the second external electrode 300. In this case, the region between the second side wall portion 1222 and the second external electrode 300 may be filled with the electrically insulating resin 1300.

[0130] In other embodiments, the second side wall portion 1222 may be in contact with the second external electrode 300.

[0131] The third side wall portion 1223 and the fourth side wall portion 1224 may disposed opposite each other in the width direction (W-axis direction). For example, the third side wall portion 1223 and the fourth side wall portion 1224 may be spaced apart from the all-solid-state battery element 1100. In this case, the region between the third side wall portion 1223 and the all-solid-state battery element 1100 may be filled with an electrically insulating resin, and the region between the fourth side wall portion 1224 and the all-solid-state battery element 1100 may be filled with an electrically insulating resin.

[0132] In other embodiments, the third side wall portion 1223 and / or the fourth side wall portion 1224 may be in contact with the all-solid-state battery element 1100.

[0133] The open portion 1230 may be a region where one side of the case 1200 is open to the outside. The open portion 1230 may be positioned opposite the bottom portion 1210 along the thickness direction (T-axis). Before the electrically insulating resin 1300 fills the open portion 1230, the inner space of the case 1200 may communicate with the outside through the open portion 1230.

[0134] The case 1200 may be composed of a material that is electrically insulating and capable of preventing moisture penetration. For example, the case 1200 may include a polymer resin such as polypropylene (PP), polybutylene terephthalate (PBT), or polycarbonate (PC), which is effective for preventing moisture penetration. However, since the present embodiment is not limited thereto, the case 1200 may be made of any material that is electrically insulating and capable of preventing moisture penetration.

[0135] The electrically insulating resin 1300 may be made of a polymeric resin-based encapsulant material that is elastic and hygroscopic to prevent volume expansion and moisture penetration of the all-solid-state battery element 1100. For example, the electrically insulating resin 1300 may include an epoxy molding compound (EMC). However, the present embodiment is not limited thereto, and the electrically insulating resin 1300 may be made of any material that is elastic, hygroscopic, and electrically insulating.

[0136] The electrically insulating resin 1300 may cover at least a portion of the all-solid-state battery element 1100, and may be accommodated within the case 1200.

[0137] The electrically insulating resin 1300 may fill the open portion 1230 of the case 1200. Accordingly, the electrically insulating resin 1300 may cover an outer surface (i.e., the fifth surface S5) of the all-solid-state battery element 1100 facing the open portion 1230 of the case 1200.

[0138] However, as will be described later, a portion of the first external electrode 200 of the all-solid-state battery element 1100 and a portion of the second external electrode 300 may be exposed to the outside of the electrically insulating resin 1300. In addition, the electrically insulating resin 1300 may fill a space between the all-solid-state battery element 1100 and an interior surface of the case 1200. Accordingly, except for a portion of the first external electrode 200 and a portion of the second external electrode 300, the all-solid-state battery element 1100 may be sealed within the case 1200 by the electrically insulating resin 1300.

[0139] For example, after mounting the all-solid-state battery element 1100 within the case 1200, the all-solid-state battery element 1100 may be sealed within the case 1200 by injecting the electrically insulating resin 1300 through the open portion 1230 of the case 1200.

[0140] Since the all-solid-state battery element 1100 is sealed within the case 1200 by the electrically insulating resin 1300, moisture inflow may be prevented, thereby improving moisture resistance reliability of the all-solid-state battery 1000.

[0141] In addition, the all-solid-state battery element 1100 may be pressurized by the surrounding electrically insulating resin 1300. Therefore, even if expansion or contraction of the positive electrode active material or the negative electrode active material occurs as the all-solid-state battery element 1100 is charged and discharged, occurrence of crack in the positive electrode layer 130 or the negative electrode layer 150 due to this expansion or contraction may be suppressed. Additionally, since the volume change of the positive electrode layer 130 and the negative electrode layer 150 is suppressed, delamination of these layers from the current collector may also be prevented.

[0142] The first external electrode 200 and the second external electrode 300 may be disposed outside the laminate 100.

[0143] For example, the first external electrode 200 and the second external electrode 300 may be made by machining a metal plate, and may be made by joining metal plates, but the present embodiment is not limited thereto. The thickness of the metal plate may be, for example, 0.01 mm or more and 0.15 mm or less, but the present embodiment is not limited thereto.

[0144] As another example, the first external electrode 200 and the second external electrode 300 may be made by machining a metal rod.

[0145] The first external electrode 200 and the second external electrode 300 may include, for example, aluminum (Al), iron (Fe), copper (Cu), gold (Au), nickel (Ni) or combinations thereof, but the present embodiment is not limited thereto.

[0146] The first external electrode 200 is electrically connected to the positive electrode layer 130 on the first surface S1 of the laminate 100. That is, the first external electrode 200 may be electrically connected to the positive electrode layer 130 via the first conductive bonding member 400. The first conductive bonding member may include, for example, silver (Ag).

[0147] For example, a conductive paste may be applied to the first surface S1 of the laminate 100, and while the conductive paste is in an uncured or semi-cured state, the first external electrode 200 may be bonded to the conductive paste. The conductive paste is then heat treated and baked at 180 °C, so that the first external electrode 200 may be tightly connected to the laminate 100 via the first conductive bonding member 400.

[0148] Therefore, the first conductive bonding member 400 may be disposed on the first surface S1 of the laminate 100, and the first external electrode 200 may be disposed on the first conductive bonding member 400.

[0149] Referring to FIG. 4, the first external electrode 200 may extend in the thickness direction (T-axis direction), to protrude to the outside of the electrically insulating resin 1300. For example, the first external electrode 200 may include a first end 201 and a second end 202 that are opposite each other in the thickness direction (T-axis direction). The first end 201 may be embedded in the electrically insulating resin 1300, and the second end 202 may be exposed from the electrically insulating resin 1300.

[0150] The second external electrode 300 may be electrically connected to the negative electrode layer 150 on the second surface S2 of the laminate 100. That is, the second external electrode 300 may be electrically connected to the negative electrode layer 150 via the second conductive bonding member 500. First conductive bonding member may include, for example, silver (Ag).

[0151] For example, a conductive paste that includes silver (Ag) may be applied to the second surface S2 of the laminate 100, and while the conductive paste is in an uncured or semi-cured state, the second external electrode 300 may be bonded to the conductive paste. The conductive paste is then heat treated and baked at 180 °C, so that the second external electrode 300 may be tightly connected to the laminate 100 via the second conductive bonding member 500.

[0152] Therefore, the second conductive bonding member 500 may be disposed on the second surface S2 of the laminate 100, and the second external electrode 300 may be disposed on the second conductive bonding member 500.

[0153] Referring to FIG. 4, the second external electrode 300 may extend in the thickness direction (T-axis direction), to protrude to the outside of the electrically insulating resin 1300. For example, the second external electrode 300 may include a third end 301 and a fourth end 302 that are opposite each other in the thickness direction (T-axis direction). The third end 301 may be embedded in the electrically insulating resin 1300, and the fourth end 302 may be exposed from the electrically insulating resin 1300.

[0154] FIG. 11 is a perspective view schematically showing an all-solid-state battery according to another embodiment, and FIG. 12 is a schematic exploded perspective view of FIG. 11. In addition, FIG. 13 is a schematic top plan view of FIG. 11, and FIG. 14 is a cross-sectional view taken along line III-III' of FIG. 13.

[0155] Referring to FIG. 11, FIG. 12, and FIG. 13, an all-solid-state battery 2000 may include an all-solid-state battery element 2100, a case 2200, and an electrically insulating resin 2300.

[0156] The all-solid-state battery element 2100 may be mounted in an inner space of the case 2200. The electrically insulating resin 2300 may cover at least a portion of the all-solid-state battery element 2100 and be contained within the case 2200.

[0157] The case 2200 may comprise a bottom portion 2210, a side wall portion 2220, and an open portion 2230. The side wall portion 2220 may comprise a first side wall portion 2221, a second side wall portion 2222, a third side wall portion 2223, and a fourth side wall portion 2224.

[0158] Referring to FIG. 12, FIG. 13, and FIG. 14, a protruding portion 2400 may be disposed on an interior surface of the case 2200.

[0159] The interior surface of the case 2200 may include a first interior surface 2225, a second interior surface 2226, a third interior surface 2227, and a fourth interior surface 2228.

[0160] The first interior surface 2225 may be an interior surface of the first side wall portion 2221, and the second interior surface 2226 may be an interior surface of the second side wall portion 2222. The third interior surface 2227 may be an interior surface of the third side wall portion 2223, and the fourth interior surface 2228 may be an interior surface of the fourth side wall portion 2224.

[0161] For example, the protruding portion 2400 may be disposed on the third interior surface 2227 and the fourth interior surface 2228 of the case 2200. The third interior surface 2227 of the case 2200 may face the third surface S3 of the all-solid-state battery element 2100, and the fourth interior surface 2228 may face the fourth surface S4 of the all-solid-state battery element 2100. However, since the present embodiment is not limited thereto, the protruding portion 2400 may be disposed on the first interior surface 2225 and the second interior surface 2226 of the case 2200. The first interior surface 2225 of the case 2200 may face the first surface S1 of the all-solid-state battery element 2100, and the second interior surface 2226 may face the second surface S2 of the all-solid-state battery element 2100.

[0162] When the all-solid-state battery element 2100 is inserted into the case 2200, if it is not centered in the case 2200, one or more surfaces of the case 2200 may be in full contact with the all-solid-state battery element 2100, which may be prevented by the protrusions 2400 disposed on the interior surface of the case 2200. Accordingly, according to the present embodiment, the electrically insulating resin 2300 may be filled with relatively few gaps, thereby increasing sealing capacity.

[0163] The protruding portion 2400 may be in contact with the all-solid-state battery element 2100. For example, the protruding portion 2400 may be in contact with at least one of the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 of the all-solid-state battery element 2100. In this case, the all-solid-state battery element 2100 is supported by the protruding portion 2400 and can be more stably disposed within the case 2200.

[0164] Referring to FIG. 12 and FIG. 14, the protruding portion 2400 may have a columnar shape extending along the thickness direction (T-axis direction). The protruding portion 2400 may have a shape that is in contact with the bottom portion 2210 of the case 2200 and extends to an end of the side wall portion 2220 in the thickness direction (T-axis direction). For example, the protruding portion 2400 may have a shape that extends from a bottom end to a top end of the first interior surface 2225 of the case 2200 in the thickness direction (T-axis direction). However, since the present embodiment is not limited thereto, the protruding portion 2400 may have a shape that is spaced apart from a bottom end of the interior surface of the case 2200 in the thickness direction (T-axis direction) or spaced apart from a top end thereof.

[0165] The protruding portion 2400 may include a plurality of stripe patterns. The protruding portion 2400 may include the plurality of stripe patterns disposed on the third interior surface 2227 and the fourth interior surface 2228 of the case 2200 and spaced apart from each other in the length direction (L-axis direction). As another example, the protruding portion 2400 may include a plurality of stripe patterns disposed on the first interior surface 2225 and the second interior surface 2226 of the case 2200 and spaced apart from each other in the width direction (W-axis direction).

[0166] A cross-section of the protruding portion 2400 intersecting the thickness direction (T-axis direction) may have a variety of shapes such as a circle, a semicircle, an ellipse, and a rectangle.

[0167] The remaining components except for the above is the same as or corresponds to the components of the all-solid-state battery shown in FIG. 1, and a redundant description thereof will be omitted.

[0168] While this disclosure has been described with reference to practical embodiments, it is understood that it is not limited to these embodiments. Instead, the disclosure encompasses various modifications and equivalent arrangements within the spirit and scope of the appended claims.

[0169] <Description of symbols>

[0170] 1000: all-solid-state battery

[0171] 1100: all-solid-state battery element

[0172] 1200: case

[0173] 1210: bottom portion

[0174] 1220: side wall portion

[0175] 1230: open portion

[0176] 1300: electrically insulating resin

[0177] 100: laminate

[0178] 110: solid electrolyte layer

[0179] 130: positive electrode layer

[0180] 150: negative electrode layer

[0181] 160: upper protective layer

[0182] 170: lower protective layer

[0183] 180: margin layer

[0184] 200: first external electrode

[0185] 300: second external electrode

Claims

1.An all-solid-state battery, comprising:a case composed of an electrically insulating materialan all-solid-state battery element housed within the case and comprising a first external electrode and a second external electrode; andan electrically insulating resin covering at least a portion of the all-solid-state battery element and housed within the case,wherein the first external electrode comprises a first end embedded in the electrically insulating resin and a second end exposed outside the electrically insulating resin, andwherein the second external electrode comprises a third end embedded in the electrically insulating resin and a fourth end exposed outside the electrically insulating resin.2.The all-solid-state battery of claim 1, wherein at least a portion of the all-solid-state battery element is spaced apart from an interior surface of the case.3.The all-solid-state battery of claim 2, wherein the electrically insulating resin at least partially fills a space between the all-solid-state battery element and the interior surface of the case.4.The all-solid-state battery of claim 1, wherein a protruding portion is positioned on an interior surface of the case.5.The all-solid-state battery of claim 4, wherein the protruding portion is in contact with the all-solid-state battery element.6.The all-solid-state battery of claim 4, wherein the protruding portion comprises a plurality of stripe patterns.7.The all-solid-state battery of claim 1, wherein:the all-solid-state battery element comprises a laminate comprising a plurality of solid electrolyte layers, a plurality of positive electrode layers, and a plurality of negative electrode layers that are stacked in a first direction;the first external electrode is disposed outside of the laminate and electrically connected to the plurality of positive electrode layers; andthe second external electrode is disposed outside of the laminate and electrically connected to the plurality of negative electrode layers.8.The all-solid-state battery of claim 7, further comprising:a first conductive bonding member positioned between the first external electrode and the plurality of positive electrode layers; anda second conductive bonding member positioned between the second external electrode and the plurality of negative electrode layers.9.The all-solid-state battery of claim 8, wherein the first conductive bonding member and the second conductive bonding member comprise silver (Ag).10.The all-solid-state battery of claim 7, wherein the electrically insulating resin covers an outer surface of the all-solid-state battery element that intersects the first direction.11.The all-solid-state battery of claim 10, wherein the electrically insulating resin is exposed from the case in the first direction.12.The all-solid-state battery of claim 11, wherein:the second end of the first external electrode is exposed from the electrically insulating resin in the first direction; andthe fourth end of the second external electrode is exposed from the electrically insulating resin in the first direction.13.The all-solid-state battery of claim 1, wherein the case comprises a polymeric resin.14.The all-solid-state battery of claim 1, wherein the electrically insulating resin comprises an epoxy molding compound (EMC).15.An all-solid-state battery, comprising:a case composed of an electrically insulating material;an all-solid-state battery element housed within the case and comprising a first external electrode and a second external electrode;an electrically insulating resin covering at least a portion of the all-solid-state battery element and positioned within the case; anda margin layer disposed along edges of a positive electrode layer and a negative electrode layer.16.The all-solid-state battery of claim 15, wherein the margin layer comprises at least one material selected from the group consisting of alumina (Al₂O₃), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon carbide (SiC), silica (SiO₂), silicon nitride (Si₃N₄), and zirconium dioxide (ZrO₂).

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