There could be a useful future for tired EV batteries
Thankfully, ideas are emerging that should improve things as they take off. In the UK, the Monks Cross HyperHub in York opened on 15 June, fielding four ABB 175kW ultra-rapid chargers and four 50kW chargers as well as 30 7kW chargers in an adjacent area designed to primarily serve park and ride customers.
A solar canopy provides weather protection for users and the energy it produces is stored in Tesla Powerpacks to reinforce the local electricity network. For the main source of supply, Monks Cross HyperHub will be powered by only renewable energy supplied via the grid. Two more hubs are due to open in the area this year, one at the Poppleton Bar park and ride and another near the city centre.
The chargers are powered by second-life lithium ion batteries from test cars mounted in cube-shaped containers with a total storage capacity of around 2.45MWh. Fed by only green power, the containers are continuously trickle-charged from the local network by a relatively modest 200kW connection, which reduces the load on the network and avoids any slowdowns. Roof-mounted 30kW solar panels also contribute to the energy store.
Lithium ion EV batteries have a life of 10-15 years, according to Renault. After that, they retain about 75% of their capacity, which makes them ideal for a life where charge cycling is far more gentle. In that role, they should be good for another 10 years. Once they do reach the end of their useful lives, recycling plants like Volkswagen’s can now extract the rare earth materials as well as the basic construction materials.
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