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Elbiler i media / Nok en gang "Ny batteriteknologi", men...
« på: Fredag 01. November 2019, klokken 22:03 »
Ja, som tittelen sier så er det nok en gang en artikkel om "Ny batteriteknologi". Men denne gangen er det ikke så store endringen som skal til ut i fra hvordan jeg forstår artikkelen, så ikke så utenkelig at denne raskt finner veien til produserte elbiler.
Her er det altså hverken mer rekkevidde eller flere hestekrefter som loves, eller lavere pris.
https://cleantechnica.com/2019/11/01/penn-state-researchers-say-a-ten-minute-recharge-is-possible-with-new-battery-technology/
Her er det altså hverken mer rekkevidde eller flere hestekrefter som loves, eller lavere pris.
https://cleantechnica.com/2019/11/01/penn-state-researchers-say-a-ten-minute-recharge-is-possible-with-new-battery-technology/
Sitat
Researchers at Penn State claim they have found a way to recharge an EV in 10 minutes and are targeting 5-minute recharging times in the near future.”We demonstrated that we can charge an electrical vehicle in ten minutes for a 200 to 300 mile range,” says Chao-Yang Wang. “And we can do this maintaining 2,500 charging cycles, or the equivalent of half a million miles of travel.” Wang is chairman of the mechanical engineering department as well as a professor of chemical engineering and materials science. He is also director of the Electrochemical Engine Center at Penn State.
The problem, Wang found in his research, is that lithium-ion batteries degrade when charged rapidly at ambient temperatures under 50 degrees Fahrenheit because the lithium deposits in spikes on the anode surface. Such lithium plating reduces cell capacity and can cause electrical spikes and unsafe battery conditions. The trick? Heat up cold batteries to a level higher than the lithium plating threshold.
Wang and his team realized that if they heat batteries to 140 degrees F | 60° C for only 10 minutes and then rapidly cool them back down to ambient temperature, lithium spikes will not form and heat degradation of the battery will not occur. Their results of the research can be found in the October 30, 2019 issue of the scientific journal Joule. “The 10 minute trend is for the future and is essential for adoption of electric vehicles because it solves the range anxiety problem,” says Wang.
The trick is to heat the battery rapidly and then cool it back down quickly. (Tesla and some other companies already pre-condition batteries for charging by heating them but do not get them as hot as the Penn State team did.) The researchers say their self-heating battery uses a thin nickel foil with one end attached to the negative terminal and the other extending outside the cell to create a third terminal. A temperature sensor attached to a switch causes electrons to flow through the nickel foil to complete the circuit. This rapidly heats up the nickel foil through resistance heating and warms the inside of the battery according to a Penn State blog post. They say the car’s own battery cooling system would take care of the cooling phase (which leaves Nissan out of the picture).