Electric Car Battery

You Only Live Once, unless you are an EV battery

The expression that enjoyed a brief but spectacular reign as the motto for our nation’s youth does not apply to the batteries of electric vehicles. Once the range of your EV falls to an unacceptable level, that battery will not simply get thrown away.

Even the most passionate electric vehicle advocates will reluctantly agree that lithium-ion batteries have a limited life span. Just how long that life will be is a subject of great debate and importance, and the jury is still out. Look for an article on the subject here at Torque News in the near future, but for now assume that a typical EV battery will last for 10 years or so.

When the capacity falls below 80% of its initial value, your Nissan LEAF is only achieving 50 or 60 miles of range and you decide the vehicle no longer fulfills its purpose, what happens to the battery? Assuming you bought your vehicle in 2010 or later and your battery lasted a decade, the year will be at least 2020 and one of two things will happen.

Option 1, the less desirable of the two, is that the battery will be sent straight to a recycling facility. There, the battery will be shredded and the metals such as cobalt, aluminum, nickel, and copper will be recovered. The lithium salts will be filtered out and converted to lithium carbonate, though the economic value of the lithium itself is minimal compared to metals like nickel and cobalt.


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Another thing to consider is improved battery technology and falling prices. I'm sure many Leaf owners would swap out their batteries much sooner than 2020 if a new battery in the same space could provide more range for a reasonable price. Let's say in five years the power density is increased by 30% and the cost is down to $125 per kWhr. A 38 kWhr pack would travel 125 miles instead of the by then degraded 85 miles and cost about $5000. The residual value might be $90 per kWhr for home use, or about $2000, so the upgrade would have a net cost of $3000. If in 5 years solar is down to $1 watt installed, then 6 KW of panels should be enough for most people, so going off grid allowing for $2000 worth of used car battery would cost about $8000. 1200 W ave at 8 cent per kWhr is 10 cents per hour, 2.40 per day, $75 per month, $900 per year, $8100 per 9 years. Since such a system would last at least twice as long, maybe three times as long, so the cost of power would be about 4 cents per kWhr, allowing for occasional upgrading of the battery and panel capacities.