The technology of the Formula E (I): the battery of the future

The new batteries of the Gen2 have become one of the attractions of this season, a fundamental test for the improvement of street electric cars, such as the Audi e-tron.

La Formula E celebrated its last EPrix eleven days ago in Rome, the seventh scoring round of the 2018-2019 season. This race was special for Lucas di Grassi, since the Brazilian of Audi Sport ABT Schaeffler has Italian blood. He finished in seventh position, after a great comeback, and continues to fight for the high places of the classification in this year of changes in Formula E.

One of those great novelties of Gen2 has been the introduction of batteries that last twice as much as in the previous seasons. So much so, that avoid the change of car during races, as they are capable of holding the 45 minutes plus one lap without having to make a pit stop.

This new design of the batteries are developed by McLaren Applied Technologies, They are larger and weigh 385 kilos, 65 more than last season. However, despite this increase, the empty weight of the car has remained almost intact: from about 890 kg last season to 900 kg of the current


are more powerful and deliver an energy of 54 kWh that allows a power of 250 kW (335 CV) and a maximum speed of 280 kilometers per hour is reached. This is one of the big differences with street vehicles. The Audi e-tron, for example, has its maximum speed limited to 200 km / h.

THE BATTERY OF THE AUDI E-TRON Thanks to the Formula E, the 100% electric vehicles of mass production are beginning to experience great advances. The New Audi e-tron is the 100% electric SUV of the German firm that is marking a before and after.

It has a total autonomy of up to 417 km thanks to the lithium-ion battery, which has a capacity of 95 kWh. It is located under the passenger compartment and has dimensions of 2.28 meters long, 1.63 meters wide and 34 centimeters high.

There are 36 modules of cells made of aluminum, each of which has a similar size to the of a shoe box. They are arranged in two levels, where the lower one is longer and the upper one, something shorter. Each module will be equipped with twelve cells with a flexible outer layer of aluminum-coated polymer.

The sophisticated thermal management of the lithium-ion battery allows recharges with powers up to 150 kW. By 2020 there will be more than 400 HPC (High Power Charging) high-power stations with up to six charging points each, in the European network of IONITY. This ultra-fast load allows you to recharge the vehicle to 80% in less than 30 min.

REGENERATIVE CAPACITY A special quality of the Audi e-tron is its regenerative capacity which, by braking or the own inertia of the car, can recover up to 30% of the energy consumed. It comes as a result of the alternation of the two modes of operation of the brake: by the friction of the pads on the disc or by the circulation by inertia while the driver lifts his foot off the accelerator or regenerative retention. It goes from one mode to another when the deceleration drops 0.3 g. This recovery system is responsible for 30% of the autonomy of the vehicle.

A unlike other electrical , which begin to brake when you lift the foot of the accelerator, este SUV released by its own inertia, much like what happens with combustion engines. It uses two paddles on the steering wheel that can increase or decrease this electric braking force.

INNOVATIVE SYSTEMS FOR LOADING AT HOME One of the tems that most concerns raises about electric cars are charging points, but increasingly, the energy companies and brands reach agreements that provide comfortable and economical solutions to recharge at home.

Audi offers several solutions for recharging at home. The compact recharging system, as standard, can be operated with a 230 volt household outlet or with a three-phase 400 volt outlet, allowing a load of up to 11 kW. The optional Connect charging system, available from 2019, doubles the load capacity up to 22 kW. In combination with a domestic energy management system, provides intelligent solutions, such as charging at the moment when electricity is cheaper, and charging with solar if the home is equipped with a photovoltaic system. With 22 kW, the Connect system recharges 80% of the battery in 4.5 hours aprox.

At the app MyAudi the customer can obtain the levele cargo, with a route planner and loading points on the way. In this way the customer can have at all times controlled the remaining level of autonomy of the vehicle.

This is possible if you have the Energy Management System (HEMS), that enables the charging system to be connected through the Domestic Wifi The device adapts to the energy requirements of the rest of the household appliances to prevent the differential from jumping. In this context, Audi is cooperating with two associated companies, SMA Solar Technology and Hager Group, which are also implementing the standard of the EEBUS initiative.

THE EEBUS INITIATIVE It was successfully tested on the Plugfest E-Mobility last month. January at the Audi plant in Brussels. This is a non-profit European association that develops internationally unified communication standards for networking domestic equipment and energy efficiency applications.

This is precisely what the EEBUS initiative has defined as its objective: fluid and intersectoral communication in the energy system of the future. The German company is working, together with more than 70 international companies, to create a common language for the management of energy in the Internet of things.

Developers and engineers carried out model tests to verify whether the photovoltaic system, the infrastructure charging, electric car and heating system can communicate without interference.

Electric has gone Audi. And this is just the beginning.

* This content sponsored by AUDI has been compiled by Diario As.

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