# US 2023/0264752 A1 · Rear vehicle-body structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0264752 A1 - Document ID: US20230264752A1 - Status: Published application - Kind: A1 - Application number: 18/109,883 - Filed: 2023-02-15 - Published: 2023-08-24 - Earliest claimed: 2022-02-24 - Assignees: Mazda Motor Corporation - Applicants: Mazda Motor Corporation - Inventors: Eiji KAMEMOTO; Kouji MATSUSHITA; Kazutaka ISHIKURA - Web page: https://patentgrep.com/patent/US20230264752A1 ## CPC - B62D 25/08: Front or rear portions {(sub-frames for mounting engine or suspensions B62D21/11)} - B60K 1/04: of the electric storage means for propulsion - B62D 21/02: comprising longitudinally or transversely arranged frame members - B62D 21/15: having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body (bumpers B60R19/02; shock absorbers in general F16F) - B62D 25/025: {Side sills thereof} - B62D 25/20: Floors or bottom sub-units {(sub-frames for mounting engine or suspensions B62D21/11; drip trays F16N31/006)} - B60K 2001/0438: {Arrangement under the floor} - B62D 25/2027: {the subunits being rear structures} - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A rear vehicle-body structure absorbs an impact from vehicle rear even when an installed amount of the batteries is increased by including a rear side frame which extends in a vehicle front-rear direction, a rear-side cross member which is arranged such that a front portion of the rear side frame abuts the rear-side cross member from vehicle rear, the rear-side cross member extending in a vehicle width direction, a pair of left and right side sills which are spaced apart, by predetermined distances, from the front portion of the rear side frame to vehicle-width-direction outer sides and extend in the vehicle front-rear direction, and a rear-side battery frame which extends in the vehicle width direction in the vehicle rear of a battery and in vehicle front of the rear side frame. The rear-side battery frame is mounted on the left and right side sills and on the rear-side cross member. ## Claims ### Claim 1 A rear vehicle-body structure for an electric vehicle which includes a traveling motor and in which a battery supplying electric power to the traveling motor is disposed below a floor panel, the rear vehicle-body structure comprising: a rear side frame which extends in a vehicle front-rear direction in a vehicle rear portion; a rear-side cross member which is arranged such that a front portion of the rear side frame abuts the rear-side cross member from vehicle rear, the rear-side cross member extending in a vehicle width direction; a pair of left and right side sills which are spaced apart, by predetermined distances, from the front portion of the rear side frame to vehicle-width-direction outer sides and extend in the vehicle front-rear direction; and a rear-side battery frame which extends in the vehicle width direction in the vehicle rear of the battery and in vehicle front of the rear side frame and protects the battery, wherein a battery casing which includes the rear-side battery frame is mounted on the left and right side sills and on the rear-side cross member. ### Claim 2 (depends on 1) The rear vehicle-body structure according to claim 1, wherein the battery is installed in an area on the vehicle-width-direction outer side of an imaginary straight line, the imaginary straight line extending forward from a central portion, in the left-right direction, of the front portion of the rear side frame toward the vehicle front. ### Claim 3 (depends on 2) The rear vehicle-body structure according to claim 2, wherein in a vehicle side view, the battery is installed to an area in the vehicle rear of rear portions of the side sills. ### Claim 4 (depends on 3) The rear vehicle-body structure according to claim 3, wherein the rear-side cross member is formed to be arranged on an upper surface of the rear-side battery frame and to extend along the upper surface of the rear-side battery frame, and the rear-side cross member and the rear-side battery frame are fastened together in an up-down direction. ### Claim 5 (depends on 4) The rear vehicle-body structure according to claim 4, wherein the rear-side cross member is joined to a lower surface of the floor panel. ### Claim 6 (depends on 5) The rear vehicle-body structure according to claim 5, wherein the rear-side cross member has a front plate portion which extends in an up-down direction and the vehicle width direction and a rear plate portion which is spaced apart from the front plate portion in a vehicle longitudinal direction and extends in the up-down direction and the vehicle width direction, and a dimension of the rear plate portion in the up-down direction is set longer than a dimension of the front plate portion in the up-down direction, and the front portion of the rear side frame abuts the rear plate portion from the vehicle rear and is joined to the rear plate portion. ### Claim 7 (depends on 1) The rear vehicle-body structure according to claim 1, wherein in a vehicle side view, the battery is installed to an area in the vehicle rear of rear portions of the side sills. ### Claim 8 (depends on 1) The rear vehicle-body structure according to claim 1, wherein the rear-side cross member is formed to be arranged on an upper surface of the rear-side battery frame and to extend along the upper surface of the rear-side battery frame, and the rear-side cross member and the rear-side battery frame are fastened together in an up-down direction. ### Claim 9 (depends on 1) The rear vehicle-body structure according to claim 1, wherein the rear-side cross member is joined to a lower surface of the floor panel. ### Claim 10 (depends on 1) The rear vehicle-body structure according to claim 1, wherein the rear-side cross member has a front plate portion which extends in an up-down direction and the vehicle width direction and a rear plate portion which is spaced apart from the front plate portion in a vehicle longitudinal direction and extends in the up-down direction and the vehicle width direction, and a dimension of the rear plate portion in the up-down direction is set longer than a dimension of the front plate portion in the up-down direction, and the front portion of the rear side frame abuts the rear plate portion from the vehicle rear and is joined to the rear plate portion. ### Claim 11 (depends on 2) The rear vehicle-body structure according to claim 2, wherein the rear-side cross member is formed to be arranged on an upper surface of the rear-side battery frame and to extend along the upper surface of the rear-side battery frame, and the rear-side cross member and the rear-side battery frame are fastened together in an up-down direction. ### Claim 12 (depends on 2) The rear vehicle-body structure according to claim 2, wherein the rear-side cross member is joined to a lower surface of the floor panel. ### Claim 13 (depends on 2) The rear vehicle-body structure according to claim 2, wherein the rear-side cross member has a front plate portion which extends in an up-down direction and the vehicle width direction and a rear plate portion which is spaced apart from the front plate portion in a vehicle longitudinal direction and extends in the up-down direction and the vehicle width direction, and a dimension of the rear plate portion in the up-down direction is set longer than a dimension of the front plate portion in the up-down direction, and the front portion of the rear side frame abuts the rear plate portion from the vehicle rear and is joined to the rear plate portion. ### Claim 14 (depends on 3) The rear vehicle-body structure according to claim 3, wherein the rear-side cross member is joined to a lower surface of the floor panel. ### Claim 15 (depends on 3) The rear vehicle-body structure according to claim 3, wherein the rear-side cross member has a front plate portion which extends in an up-down direction and the vehicle width direction and a rear plate portion which is spaced apart from the front plate portion in a vehicle longitudinal direction and extends in the up-down direction and the vehicle width direction, and a dimension of the rear plate portion in the up-down direction is set longer than a dimension of the front plate portion in the up-down direction, and the front portion of the rear side frame abuts the rear plate portion from the vehicle rear and is joined to the rear plate portion. ### Claim 16 (depends on 4) The rear vehicle-body structure according to claim 4, wherein the rear-side cross member has a front plate portion which extends in an up-down direction and the vehicle width direction and a rear plate portion which is spaced apart from the front plate portion in a vehicle longitudinal direction and extends in the up-down direction and the vehicle width direction, and a dimension of the rear plate portion in the up-down direction is set longer than a dimension of the front plate portion in the up-down direction, and the front portion of the rear side frame abuts the rear plate portion from the vehicle rear and is joined to the rear plate portion.