It turns out that a method based on reacting to internal resistance during fast recharges should be less damaging to the battery. However, this suggests not-so-fast mid-journey recharge times.
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Commercial fast-charging stations subject electric car batteries to high temperatures and high resistance that can cause them to crack, leak, and lose their storage capacity, according to researchers at the University of California, Riverside (UCR) in a new open-access study published in the journal Energy Storage.
To remedy this, the researchers have developed a method for charging at lower temperatures with less risk of catastrophic damage and loss of storage capacity, reports Green Car Congress.
In order to make EVs more competitive with combustion engine vehicles, development of an effective fast charging technique is inevitable. However, improper employment of fast charging can damage the battery and bring safety hazards. Herein, industry based along with our proposed internal resistance (IR) based fast charging techniques were performed on commercial Panasonic NCR 18650B cylindrical batteries. To further investigate the fast charging impact and electrode degradation mechanisms, electrochemical analysis and material characterization techniques including EIS (electrochemical impedance spectroscopy), GITT (galvanostatic intermittent titration technique), SEM (scanning electron microscopy), and XRD (X-ray diffraction) were implemented.
—Sebastian et al.
Mihri Ozkan, a professor of electrical and computer engineering and Cengiz Ozkan, a professor of mechanical engineering in the Marlan and Rosemary Bourns College of Engineering, led a group that charged one set of discharged Panasonic NCR 18650B cylindrical lithium-ion batteries, found in Tesla cars, using the same industry fast-charging method as fast chargers found along freeways.
They also charged a set using a new fast-charging algorithm based on the battery’s internal resistance, which interferes with the flow of electrons. The internal resistance of a battery fluctuates according to temperature, charge state, battery age, and other factors. High internal resistance can cause problems during charging.
The UC Riverside Battery Team charging method is an adaptive system that learns from the battery by checking the battery’s internal resistance during charging. It rests when internal resistance kicks in to eliminate loss of charge capacity.
For the first 13 charging cycles, the battery storage capacities for both charging techniques remained similar. After that, however, the industry fast-charging technique caused capacity to fade much faster—after 40 charging cycles the batteries kept only 60% of their storage capacity.
Batteries charged using the internal resistance charging method retained more than 80% capacity after the 40th cycle.
Full report here.
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I note there is a missing bit of information in this report – just how much does their internal resistance charging method increase the charging time.
No matter how the government rabbits on about EV’s there will always be the time gap between charging the battery and filling the fuel tank of ICE cars.
That’s devastating for the EV industry. either of these situations is very bad:
“….after 40 charging cycles the batteries kept only 60% of their storage capacity. … Batteries charged using the internal resistance charging method retained more than 80% capacity after the 40th cycle.”
An EV loses 20% (at best) to 40% of its capacity after the first two months or so? (40 charges)
How novel–not.
Reinventing the wheel…
People in the know about battery tech have known for years that fast charging shortens battery life, and that temperature of the cell is paramount during charging. And yes,the cycle always takes longer. How long depends on the depth of discharge and age.
“retained more than 80% capacity after the 40th cycle.”
so about 40 days then. And then what? another 20% over the next 40 days??
My F-150 is 19 years old with about 130,000 miles. My Town Car is 16 years old with about 125,000 miles. Neither engine has lost any appreciable power. At all. It takes about two minutes to refuel either one with around 350 mile range.
And I’m supposed to trade them in for that….?? Uh, NO! The only EV I’m using is a cart at the golf course.
An EV loses 20% (at best) to 40% of its capacity after the first two months or so? (40 charges)
Only if fast chargers are used for all the charges.