A Tesla battery researcher has presented updated test results pointing to batteries lasting more than 15,000 cycles or equivalent to more than 2 million miles (3.5 million km) in an electric car .
Last year, we reported to Jeff Dahn and his lab, who are under contract to conduct battery research for Tesla, releasing an interesting paper showing how the latest Li- battery technology. ions that can produce batteries that will last a million miles in electric vehicles.
In a new presentation, Dahn discussed the updated test results from this new battery, which he hopes will be the new standard of Li-ion batteries measured by new battery technologies.
The scientist, well-known as a pioneer in Li-ion batteries, referred to our article since last year about their role and is said to have aroused a great interest in new battery chemistry and long battery life.
They continue testing the batteries some of which go through 3 years of testing and over 10,000 cycles:
Dahn has now concluded that these batteries in a medium range electric car can last more than 3.5 million km or more than 2 million miles.
He also showed results based on different discharge depths, which means what percentage of their capacity the batteries came out before recharging them, and it showed Li-ion batteries that were efficient performs after up to 15,000 cycles today:
Most impressively, batteries show very little damage capacity when they are discharged between 25% to 50% of their capacity, which is exactly 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 more than 300 mile range, you can use it to travel 30 miles a day and by charging, on average, from 70 to 80% daily, will result this from very small to battery damage.
Considering this means that batteries can last forever or longer than the actual useful life of a car, Dahn brought up the question: do we really need batteries that are efficient?
Tesla CEO Elon Musk says they plan to have batteries that will last more than a million miles for the automaker’s “robotaxis”, which will have a higher usage rate than consumer vehicles.
Musk has also mentioned in the past how longer batteries are critical for other Tesla programs, such as Powerwalls, Powerpacks, and Tesla Semi electric trucks.
Dahn also brought in that new extra long-lasting batteries could be useful to enable vehicle-to-grid features.
In the past, Tesla has been bold in enabling owners to use batteries inside their cars to eliminate energy from the grid due to the impact on long battery life, but new batteries will fix those issues. .
Interestingly, Drew Baglino, one of Tesla’s leading engineering leaders, recently mentioned that future Tesla vehicles will have bi-directional chargers enabling vehicle-to-grid technologies or vehicle-to-all.
Dahn brought many other interesting potential uses of batteries with extreme longevity and briefly said about Tesla’s ‘Battery Day’ in the presentation:
“Tesla is advancing at the speed of light. Their factory is up-scale. They know they will need terawatt-hour batteries for both energy storage and vehicles. This is a very exciting time.”
Here is Jeff Dahn’s new presentation in its entirety:
Very interesting and wonderful new test result here.
This is especially interesting because longevity is not something that Tesla talked about during the Battery Day presentation.
It focuses primarily on cost and scale, but Tesla is guiding for a while now that they are making great long-term improvements and a lot of improvements that seem to come from Jeff Dahn’s lab.
Older Tesla cars only show limited battery damage and overall, the batteries in Tesla cars seem very good, but it is tempting to think that in the near future, longevity can be very good. allows new features and different use cases.
As before, Jeff Dahn did not disclose when or when Tesla implemented these changes, but now that the company is making its own cells, I would not be surprised if Tesla 4680 cells feature some crazy longevity.
FTC: We use earnings to earn affiliate link auto. more
Subscribe to Electrek on YouTube for exclusive videos and subscribe to the podcast.