So it will be the second life for electric car batteries


thermal power plant (coal) in As Pontes (A Coruña)

One of the concerns of the skeptics is what will happen to the batteries of electric cars once it has finished its useful life. We understand as “life” for automotive use with a capacity of 80% with respect to the original; for example, it is the equivalent of going from 180 km to 144 km) from there, the batteries have other uses.

The three “R’s” of sustainability are reduce, reuse, and recycle. That is to say, before you dismantle the batteries and recycle their materials can be used in less intensive uses, as may be the domestic. The batteries are second hand have many applications.

The batteries have less life when used often the fast recharge, but they hold about 200,000-300,000 km

  • As accumulators of reserves: the batteries can store power for backup in case of system failure electric power failure, overload, storm… A battery of 24 kWh at 80% you can still give energy to a chalet for more than three hours without giving up the use of household appliances. In cold areas with electric heating, its usefulness is out of doubt.


modern cars are like the pig, you can take advantage of almost all. The batteries are reusable and recyclable in virtually all of its weight, any end lying in a river (does not make sense economically)

  • As a complement to renewable energy: those who have solar panels or wind turbines and are generating more energy than needed at that time, it can store the surplus in a battery. When you need energy and there is no sun or wind, there is still power available.
  • As help to lose the receipt: the energy is cheaper when there is spare, and more expensive when you have to produce in peak demand. The battery takes the network energy cost in hours valley, and pour it to the home network when the price is higher, pulling less of the outside network.

Of Spanish legislation does not allow you to have energy storage facilities connected to the network, according to the Royal Decree 1699/2011, of 18 November, in paragraph 4, article 11. Yes they can be used for storing surplus of renewable production, if there is no connection to the network.


Battery domestic of Mercedes, with a capacity of 2.5 kWh

Thinking big: power plants

There are manufacturers who are thinking to accumulate the sufficient number of batteries, whether new or reused, to form a “megabatería” capable of giving service to thousands of homes. The principle of operation is similar to the accumulation to lose the receipt.

These plants are nutrirían of the energy of the electrical system when the prices are very low, which coincides with excess production of wind or solar. These circumstances are very difficult to predict. Cheap energy is stored, and discharged to the grid when the price of the pool electric is high.

Storing energy in batteries means a minimum loss, but it is acceptable

In other words, buy with low prices and sell with high prices, which produces a benefit. In addition, it helps the system to pull less energy, thermal or combined cycle to cover excess demand. Reduced both emissions and the costs of the electric system for all, more plants of this type, the greater the overall benefit.


demand Curve of a day in may. These plants will feed of the energy in periods of lower consumption or higher production, and resold in times of higher demand and lower renewable production

Account Reuters that Nissan, of the hand of The Mobility House, plans to deploy in Europe an accumulator 100 megawatt-hour, that is to say, the sum of more than 3,300 batteries 30 kWh nuevecitas, or more than 5,200 batteries of 24 kWh who are up to 80% of their capacity. It is not unreasonable to get that amount of batteries of the first units of Nissan Leaf (2010) reach the end of its useful life.

today Nissan has not changed 10 batteries in all of Europe

With 100 MWh can be feed to 120,000 households and recover energy that otherwise would not be consumed. In fact, sometimes there is a disconnect wind farms due to excess production, when energy prices become negative. The electrical will be delighted to have this “competition”, because their costs are going to decrease.

In short, no one has to fear for a bad target for the batteries of electric cars. Whether at home or on an industrial scale, they will be able to continue to service, saving emissions and money to individuals, businesses and production industry. This will flatten the demand curve, by smoothing peaks in demand and production, and the closer the balance, best for all.