# US 12,015,124 B2 · Solid-state battery and solid-state battery group > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,124 B2 - Document ID: US12015124B2 - Status: Granted - Kind: B2 - Application number: 17/198,394 - Filed: 2021-03-11 - Published: 2021-07-01 - Granted: 2024-06-18 - Earliest claimed: 2018-09-14 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Makoto Yoshioka; Kenichi Bando - Web page: https://patentgrep.com/patent/US12015124B2 ## CPC - H01M 10/052: Li-accumulators - H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0562: Solid materials - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/117: Inorganic material - H01M 50/141: for protecting against humidity - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/50: Current conducting connections for cells or batteries - H01M 50/512: Connection only in parallel - H01M 50/531: Electrode connections inside a battery casing - H01M 50/172: Arrangements of electric connectors penetrating the casing - H01M 2300/0068: inorganic - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A solid-state battery including a battery element that includes one or more battery constitutional units, each battery constitutional unit including a positive electrode layer and a negative electrode layer facing each other and a solid electrolyte layer arranged between the positive electrode layer and the negative electrode layer; a first protective layer covering an upper surface of the battery element; and a second protective layer covering a lower surface of the battery element, wherein the first and second protective layers include an insulating substance other than resin. ## Claims ### Claim 1 A solid-state battery comprising: a battery element that includes one or more battery constitutional units, each battery constitutional unit including a positive electrode layer and a negative electrode layer facing each other and a solid electrolyte layer arranged between the positive electrode layer and the negative electrode layer; a first protective layer covering an upper surface of the battery element, the first protective layer having a first protruding portion that protrudes past the battery element in a sectional view of the solid-state battery; a second protective layer covering a lower surface of the battery element, the second protective layer having a second protruding portion that protrudes past the battery element in a sectional view of the solid-state battery; and a side surface reinforcing portion that reinforces a side surface of the battery element and extends between the first protruding portion of the first protective layer and the second protruding portion of the second protective layer, wherein the side surface reinforcing portion is in direct contact with side surfaces of each of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer, and wherein the first and second protective layers include an insulating substance other than resin. ### Claim 2 (depends on 1) The solid-state battery according to claim 1, wherein an outer peripheral surface of the side surface reinforcing portion is curved inward in an in-plane direction perpendicular to a stacking direction of each layer of the battery constitutional unit in the sectional view of the solid-state battery. ### Claim 3 (depends on 2) The solid-state battery according to claim 2, wherein the side surface reinforcing portion is an integrally sintered body together with the side surface of the battery element covered by the side surface reinforcing portion. ### Claim 4 (depends on 1) The solid-state battery according to claim 1, wherein the first protective layer and the second protective layer are integrally sintered bodies together with the upper and lower surfaces of the battery element. ### Claim 5 (depends on 1) The solid-state battery according to claim 1, wherein the first protective layer is in direct contact with the upper surface of the battery element, and the second protective layer is in direct contact with the lower surface of the battery element. ### Claim 6 (depends on 1) The solid-state battery according to claim 1, wherein two adjacent layers of all the layers of the battery element are jointly sintered bodies. ### Claim 7 (depends on 1) The solid-state battery according to claim 1, wherein the insulating substance is an insulating inorganic substance. ### Claim 8 (depends on 7) The solid-state battery according to claim 7, wherein the insulating inorganic substance is one or more materials selected from: quartz glass, composite oxide-based glass that is a combination of SiO2 and one selected from at least one of PbO, B2O3, MgO, ZnO, Bi2O3, Na2O, and Al2O3, alumina, cordierite, mullite, steatite, and forsterite. ### Claim 9 (depends on 1) The solid-state battery according to claim 1, wherein the insulating substance has an ionic conductivity of 1×10−7 S/cm or less. ### Claim 10 (depends on 1) The solid-state battery according to claim 1, wherein the insulating substance has an electron conductivity of 1×10−7 S/cm or less. ### Claim 11 (depends on 1) The solid-state battery according to claim 1, wherein a thickness of a thickest portion of the protective layer is 500 μm or less. ### Claim 12 (depends on 1) A solid-state battery group comprising: two or more solid-state batteries according to claim 1, wherein two solid-state batteries among the two or more solid-state batteries that are adjacent to each other in a stacking direction of the layers of the battery constitutional unit are integrally sintered bodies with at least one of the first protective layer and the second protective layer of the two solid-state batteries that are adjacent to each other interposed therebetween. ### Claim 13 (depends on 12) The solid-state battery group according to claim 12, wherein the two adjacent solid-state batteries each have a parallel structure and are connected in parallel. ### Claim 14 (depends on 12) The solid-state battery group according to claim 12, wherein the two adjacent solid-state batteries each have a series structure and are connected in parallel, and the two adjacent solid-state batteries are arranged in a manner that a stacking order of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer are aligned with each other. ### Claim 15 (depends on 12) The solid-state battery group according to claim 12, wherein the two adjacent solid-state batteries each have a series structure and are connected in parallel, and the two adjacent solid-state batteries are arranged in a manner that a stacking order of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer are reversed from each other. ### Claim 16 (depends on 12) The solid-state battery group according to claim 12, wherein only one of the first protective layer and the second protective layer of the two solid-state batteries that are adjacent to each other is interposed between the two adjacent solid-state batteries. ### Claim 17 (depends on 12) The solid-state battery group according to claim 12, wherein both the first protective layer and the second protective layer of the two solid-state batteries that are adjacent to each other are interposed between the two adjacent solid-state batteries.