# US 2022/0045397 A1 · Battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0045397 A1 - Document ID: US20220045397A1 - Status: Published application - Kind: A1 - Application number: 17/484,303 - Filed: 2021-09-24 - Published: 2022-02-10 - Earliest claimed: 2019-03-29 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Tsuyoshi NAKAMURA - Web page: https://patentgrep.com/patent/US20220045397A1 ## CPC - B25F 5/006: {Vibration damping means} - H01M 50/242: adapted for protecting batteries against vibrations, collision impact or swelling - B60L 50/64: Constructional details of batteries specially adapted for electric vehicles - H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries} - H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) - H01M 50/227: Organic material - H01M 50/284: with incorporated circuit boards, e.g. printed circuit boards [PCB] - H01M 50/291: characterised by their shape - H01M 50/293: characterised by the material - H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543) - H01M 50/503: characterised by the shape of the interconnectors - H01M 50/505: comprising a single busbar - H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection - B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)} - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A battery pack includes a battery unit including at least one battery, a case configured to accommodate the battery unit, and a foamed resin member provided between the battery unit and the case. The foamed resin member has a facing portion facing an end surface or a side surface of the battery unit. The facing portion includes a first surface portion and a second surface portion, and at least a part of the second surface portion is harder than the first surface portion and is configured to support the battery unit. ## Claims ### Claim 1 A battery pack comprising: a battery unit including at least one battery; a case configured to accommodate the battery unit; and a foamed resin member provided between the battery unit and the case, wherein the foamed resin member includes a facing portion facing an end surface or a side surface of the battery unit, wherein the facing portion includes a first surface portion and a second surface portion, and wherein at least a part of the second surface portion is harder than the first surface portion and is configured to support the battery unit. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein a foam density of a second foamed resin constituting the second surface portion is lower than a foam density of a first foamed resin constituting the first surface portion. ### Claim 3 (depends on 1) The battery pack according to claim 1, wherein battery unit further includes a holder configured to hold the at least one battery. ### Claim 4 (depends on 2) The battery pack according to claim 2, wherein the battery unit further includes a holder configured to hold the at least one battery. ### Claim 5 (depends on 1) The battery pack according to claim 1, wherein the foamed resin member has a first protrusion portion protruding toward the battery unit, and the second surface portion includes the first protrusion portion. ### Claim 6 (depends on 2) The battery pack according to claim 2, wherein the foamed resin member has a first protrusion portion protruding toward the battery unit, and the second surface portion includes the first protrusion portion. ### Claim 7 (depends on 3) The battery pack according to claim 3, wherein the foamed resin member has a first protrusion portion protruding toward the batter unit, and the second surface portion includes the first protrusion portion. ### Claim 8 (depends on 1) The battery pack according to claim 1, wherein the battery unit has a second protrusion portion protruding toward the foamed resin member, and at least a part of the second surface portion is in contact with the second protrusion portion. ### Claim 9 (depends on 2) The battery pack according to claim 2, wherein the battery unit has a second protrusion portion protruding toward the foamed resin member, and at least a part of the second surface portion is in contact with the second protrusion portion. ### Claim 10 (depends on 3) The battery pack according to claim 3, wherein the battery unit has a second protrusion portion protruding toward the foamed resin member, and at least a part of the second surface portion is in contact with the second protrusion portion. ### Claim 11 (depends on 8) The battery pack according to claim 8, wherein the foamed resin member has a first recess portion that is recessed in a direction away from the battery unit and accommodates the second protrusion portion, and the first recess portion includes the second surface portion. ### Claim 12 (depends on 1) The battery pack according to claim 1, wherein the first surface portion is configured to be elastically deformable, and at least a part of the second surface portion is plastically deformed. ### Claim 13 (depends on 1) The battery pack according to claim 1, wherein the foamed resin member includes at least one selected from the group consisting of a polyphenylene ether-based resin, a polystyrene-based resin, an olefin-based resin, and combinations thereof. ### Claim 14 (depends on 1) The battery pack according to claim 1, wherein the foamed resin member is formed of foamed beads. ### Claim 15 (depends on 1) The battery pack according to claim 1, wherein a second foamed resin constituting the second surface portion is separable from a first foamed resin constituting the first surface portion. ### Claim 16 (depends on 1) A power tool comprising the battery pack according to claim 1. ### Claim 17 (depends on 1) An electric vehicle comprising the battery pack according to claim 1.