Last year, Jeff Dahn showed the latest Li-ion battery technology can produce batteries that would last 1 million miles in electric vehicles. While the NEW test results are encouraging and very enlightening, the critique here is the same that is has been used against other battery - using test conditions that would be idealized conditions for the operation of any electric vehicle. In this case, using an electric vehicle for less than 30 miles per day.
To be clear, if an electric vehicle is used "less than 30 miles per day," then the battery will be "discharged between 25% to 50%" and the battery will show "very little to no battery degradation." Don't miss the side note at the bottom.
Here is the outline via electrek.co
A Tesla battery researcher showed updated test results pointing to batteries lasting over 15,000 cycles or the equivalent of over 2 million miles (3.5 million km) in an electric car.
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In a new presentation, Dahn discussed updated test results from this new battery, which he hopes becomes the new standard Li-ion battery against which new battery technologies benchmark themselves.
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Dahn now concludes that these batteries in a medium-range electric car would be able to last over 3.5 million km or over 2 million miles.
He also showed results based on different depths of discharge, which means to what percentage of capacity they are discharging the batteries before recharging them, and it showed the Li-ion batteries performing extremely well after up to 15,000 cycles so far:
Most impressively, the batteries show very little to no capacity degradation when they are discharged between 25% to 50% of their capacity, which is actually how most people use their cars.
On average, American drivers use their vehicles for less than 30 miles per day.
For example, with this battery in a Tesla vehicle with over 300 miles of range, you could use it to commute 30 miles a day and by charging, on average, from 70 to 80% every day, it would result in very little to no battery degradation.
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As usual, Dahn is not disclosing whether or when Tesla is implementing these changes, but with the company now making its own cells, I wouldn't be surprised if the Tesla 4680 cells feature some crazy longevity.
Side Note
An interesting side note in the article is that new Tesla vehicles will giant rovering batteries. Here is the quote:Interestingly, Drew Baglino, one of Tesla’s top engineering leaders, has recently mentioned that future Tesla vehicles will have bi-directional chargers enabling vehicle-to-grid or vehicle-to-everything technologies.
Tesla battery researcher unveils new cell that could last 1 million miles in 'robot taxis'
https://electrek.co/2019/09/07/tesla-battery-cell-last-1-million-miles-robot-taxis/
Sep. 7, 2019
Tesla battery researcher shows new test results pointing to batteries lasting over 2 million miles
https://electrek.co/2020/10/18/tesla-battery-test-results-over-2-million-miles/
Oct. 18, 2020
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