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Fast Charging damages Electric Vehicle battery

image credit: https://onlinelibrary.wiley.com/doi/pdf/10.1002/est2.141
sushank sachan's picture
owner, bauaelectric

I write on Electric Vehicles and Grid Related Topics at www.bauaelectric.comI work on DC/DC Converters used in EV, HEV for power conversion application

  • Member since 2021
  • 10 items added with 5,806 views
  • Mar 19, 2021
  • 856 views

as per the latest study published in the energy storage made in the university of California that fast charging technology used in the commercial electric vehicle can shorten the life of electric vehicle and most probably could damage it. commercial fast charging methods puts batteries in high temperature and high energy density which causes damage to the batteries such as leak, crack, or loss of storage capacity. researchers have developed a method to for charging at lower temperature with less damage to the battery.

in the experiment discharged Panasonic 18650B Li-ion cell was charged, that is found in Tesla cars. charging was done using same industry standards. they also charged a set of same battery using their own fast charging algorithm that keeps track of batteries internal resistance as internal resistance varies with temperature, SOC, age etc, higher internal resistance can cause the problem.

their method of charging keeps track of batteries internal resistance, when resistance boost up charging rests, to prevent the losses and storage.

For the first 13 charging cycle the battery capacity remains same for both methods however after 40 cycles capacity with industry standards charging method went to 60% whereas with new internal resistance tracking system charging method the capacity remains upto 80%

Industrial fast charging affects the life span of the battery due to increase in the internal resistance, which results in heat generation and deterioration further. after 60 cycles the casing of the cells were cracked and exposed to air which results in the risk of fire. Internal resistance charging method results in lower temperature rise and no damage.

The researchers are now moving to patent this method of charging with name of adaptive internal resistance fast charging algorithm.

Discussions
Matt Chester's picture
Matt Chester on Mar 19, 2021

I think this is going to be one of the real challenges for real implementation towards V2G for utility companies-- customers would need to be compensated in a way that makes this degradation worth their while. Do you think the economics on V2G can still get to that point, Sushank? 

sushank sachan's picture
sushank sachan on Mar 20, 2021

well, i think in case of V2G current drawn from the battery will not that too high, discharging current will be limited to maximum C rating, and even lesser say 0.5C so in this case we don't see any considerable amount of degradation.

Matt Chester's picture
Matt Chester on Mar 22, 2021

That would be important to see! I'll be eager to see independent verification of the battery health not being negatively impacted

Jim Stack's picture
Jim Stack on Mar 23, 2021

The University of Delaware has done a study on batteries with V2G. They have a fleet of 20 MINI-E Electrics and EVen have a local tariff to give a 1200 a year payback. They say it tickles the batteries and makes them better. 

Jim Stack's picture
Jim Stack on Mar 19, 2021

Thanks for bringing attention to the issues of Fast Charging. Many studies of Super Charging with a Tesla have shown very little degradation. Their vehicles have great cooling systems. They also precondition the battery as you travel to a Super Charger so it is very easy on the battery. If you watch as the battery gets to a higher SOC State of Charge it slows down the charge rate. 

   As to Matts question concerning V2G the power pulled from a battery is normally very small and a very low rate. It's more like a Level 2 draw of 6 kW vs a Super Charge at 120 kW. In FACT studies by the University Of Delaware show it helps the battery by keeping it active with what is more like a trickle charge. I can't wait for V2G to be more wide spread and I will be able to have it work with my Solar home. 

sushank sachan's picture
Thank sushank for the Post!
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