A Tesla battery researcher has shown updated test results showing batteries with a duration of 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 Dan and his lab, which were contracted to test Tesla batteries, publishing an interesting article showing how the latest Li-ion battery technology can produce batteries that can last 1 million miles in electric vehicles.
In a new presentation, Dan discussed updated test results from this new battery, which he hopes will become the new standard lithium-ion battery against which the new battery technologies are compared.
The scientist, who is widely recognized as a pioneer in lithium-ion batteries, referred to our article last year on their paper and said that this has aroused great interest in this new battery chemistry and battery life.
They continue to test these batteries, some lasting 3 years and over 1
Dan now concludes that these batteries in a medium-range electric car could 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 showed that lithium-ion batteries perform extremely well after up to 15,000 cycles so far:
Most impressively, batteries show very little or no deterioration in capacity when they run out of between 25% and 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 a day.
For example, with this battery in a Tesla car with a range of more than 300 miles, you can use it to travel 30 miles a day, and charging an average of 70 to 80% each day would result in very little to no battery depletion.
Considering that this would mean that these batteries could in fact last forever or much longer than the actual useful life of a car, Dahn raises the question: do we need such good batteries?
Tesla CEO Elon Musk says they plan to have batteries that can last more than 1 million miles for the automaker’s “robotics,” which will have a much higher utilization rate than consumer vehicles.
In the past, Musk also mentioned how long-lasting batteries are crucial to other Tesla programs, such as Powerwalls, Powerpacks and Tesla Semi electric trucks.
Dahn also points out that these new super long-lasting batteries could be useful for activating the vehicle’s functions to the mains.
In the past, Tesla was restrained by allowing owners to use the batteries in their cars to dissipate energy to the grid due to the impact on battery life, but these new batteries would solve these problems.
Interestingly, Drew Baglino, one of Tesla’s top engineering leaders, recently mentioned that future Tesla vehicles will have bidirectional chargers that allow network-to-network or vehicle-to-all technology.
Dahn presented several other interesting potential uses of batteries with exceptional longevity 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 they will need terawatt-hour batteries for both energy storage and vehicles. This is an incredibly exciting time. “
Here is Jeff Dan’s new presentation in its entirety:
Very interesting and impressive new test results here.
This is especially interesting because longevity is not something that Tesla talks about much during the Battery Day presentation.
It focuses mainly on cost and scale, but Tesla has been leading for some time that they are making big improvements in longevity, and many of those improvements seem to come from Jeff Dan’s lab.
Older Tesla vehicles have already shown only limited battery degradation, and in general the batteries in Tesla vehicles seem to be performing quite well, but it is fascinating to think that in the near future longevity may be so great that allows for new features and different uses.
As usual, Jeff Dan does not reveal if and when Tesla is implementing these changes, but since the company is now making its own cells, I wouldn’t be surprised if the Tesla 4680’s cells have some crazy longevity.
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