Aston Martin last week a range of technical details for its first all-electric production car, the Rapide E.
Rapide E powertrain diagram.
Aston Martin worked closely with Williams Advanced Engineering (WAE) as its development partner. The engineering team focused on achieving effective cooling of the batteries and motor to ensure consistent performance, while strict weight targets have been stringently observed using lightweight alloys and carbon composite materials.
Rapide E will be powered by an 800V battery electrical architecture with a 65 kWh pack comprising more than 5600 18650 format Li-ion cylindrical cells. These are mounted in a bespoke battery pack placed where the original 6.0-liter V12, gearbox and fuel tank were located. This battery system powers two rear-mounted electric motors producing a combined target output of just over 610PS and a colossal 950N·m of torque.
Rapide E’s range target is more than 200 miles under the Worldwide Harmonised Light Vehicle Test Procedure (WLTP), while the model is capable of charging at a rate of 185 miles of range per hour using a typical 400V 50 kW charger. However, the car’s 800V high-voltage battery system enables faster charging of 310 miles of range per hour, using an 800V outlet delivering 100kW or higher.
Being an Aston Martin, the Rapide E is being developed with a high-performance objective. Projected top speed for the Rapide E is 155 mph, with a sub-4.0sec 0-60 mph time and a 50-70 mph time of just 1.5sec.
These figures are not restricted to a narrow window only when the batteries are fully-charged. Instead the target is for maximum performance on-demand throughout majority of the battery state of charge window, as would be expected from a conventional internal combustion-engined car.
This includes the ability to drive a full lap of the Nürburgring with absolutely no derating of the battery and the ability to cope with the daily demands of repeated hard acceleration and braking.
The car’s exterior and underbody has also been aerodynamically optimized and complemented with newly-designed aerodynamic wheels. Shod with Pirelli P Zero, Rapide E’s bespoke tires aim to deliver a lower rolling-resistance and reduced cavity noise, while still delivering superior dynamic capability. Rapide E aims to achieve higher levels of aerodynamic, frictional loss and cooling performance over the standard Rapide S.
One objective of the project is to retain and to enhance the feel, character and delivery of the V12-engined Rapide S. To this end, careful attention will be paid to the development and tuning of both the electric powertrain and the chassis, with particular focus applied to software integration.
The rear-wheel drive Rapide E’s twin electric motors will drive through a Limited-Slip Differential, which combined with revised spring and damper rates ensures the pure handling characteristics for which the gasoline-powered Rapide S is already renowned.
Though the Rapide E will be built in low volumes, it is being subjected to Aston Martin’s stringent and exhaustive testing protocols, with the dedicated WAE team working closely alongside Aston Martin personnel to ensure every aspect of the prototype test programme follows the marque’s established procedures.
Uniquely, customers will be an extended part of the ongoing Rapide E program, with their comments and driving experiences providing feedback that will help shape and improve future Aston Martin EVs.
In addition to WAE, the Rapide E programme enjoys the support of other technical partners including Hyperbat Limited—a new joint venture company between Williams Advanced Engineering and Unipart Manufacturing Group—as the battery manufacturer, Integral Powertrain for the electric motors, Xtrac for the transmission and the H1PERBAT project consortium with grant funding from the Advanced Propulsion Centre.
Rapide E will be built at the upcoming St. Athan production facility, announced as the future Home of Electrification for both the Aston Martin and Lagonda brands. Aston Martin is accepting expressions of interest via its global dealership network, with pricing available on application.
Customer deliveries are set for Q4 2019.