The Tesla battery researcher showed updated test results, indicating batteries lasting more than 15,000 cycles or the equivalent of more than 2 million miles (3.5 million km) in an electric car.
Last year, we reported on Jeff Dunn and his lab, which are conducting contract research on batteries for Tesla, in an interesting article that shows how the latest lithium-ion battery technology can produce batteries that last a million miles in electric vehicles.
In a new presentation, Dan discussed the updated test results of this new battery, which he hopes will become the new standard lithium-ion battery, which is compared to new battery technologies.
The scientist, who is widely recognized as a pioneer in lithium-ion batteries, mentioned our article last year about their article and said that it aroused great interest in this new battery chemistry and battery life.
They continued to test these batteries, some lasting 3 years and more than 10,000 cycles:
Dan now concludes 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 capacity they discharge the batteries before charging them, and he showed that lithium-ion batteries work extremely well after up to 15,000 cycles at the moment:
Most strikingly, batteries show very little or no deterioration in capacity when they are discharged from 25% to 50% of their capacity, which is actually how most people use their machines.
On average, American drivers use their cars less than 30 miles a day.
For example, with this battery in a Tesla vehicle with a range of more than 300 miles, you can use it to drive 30 miles a day, and charging, on average, 70 to 80% daily, will result in very little or no causing deterioration of the battery.
Believing that this would mean that these batteries could actually last forever or much longer than the actual life of the car, Dan raises the question: do we really need such quality batteries?
Tesla CEO Elon Musk said they plan to have batteries that are enough for more than 1 million miles for the automotive industry, which has a much higher utilization rate than consumer vehicles.
Musk also mentioned in the past how durable batteries are critical to other Tesla programs, such as Powerwalls, Powerpacks and Tesla Semi.
Dan also emphasizes that these new extremely durable batteries can be useful for providing the car with network functions.
In the past, Tesla was reluctant to allow owners to use batteries in their cars to discharge energy into the grid due to the impact on battery life, but these new batteries would solve these problems.
Interestingly, Drew Baglino, one of Tesla’s leading engineering leaders, recently mentioned that future Tesla vehicles will have bidirectional chargers that allow the use of network vehicles or vehicles to everything.
Dan talked about some other interesting potential ways to use batteries with extreme durability and briefly commented on Tesla’s “Battery Day” in the presentation:
“Tesla is moving forward at the speed of light. They are enlarging their factory. They know that they will need terawatt-hours of batteries for both energy storage and vehicles. It’s an incredibly exciting time. “
Here is Jeff Dan’s new presentation in full:
Very interesting and impressive new test results here.
This is especially interesting because longevity is not something Tesla talked about a lot during the Battery Day presentation.
It has focused mainly on cost and scale, but Tesla has been driven for some time by making significant improvements in longevity, and many of these improvements seem to come from Jeff Dunn’s lab.
Older Tesla vehicles have already shown only limited battery degradation, and in general, the batteries in Tesla vehicles already seem quite large, but it is fascinating to think that in the near future durability may be so great that it gives new features and different uses.
As usual, Jeff Dunn does not say if and when Tesla is implementing these changes, but since the company is now making its own cells, I would not be surprised if the Tesla 4680 cells have a crazy longevity.
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