Technology:
Daikin Industries and Nippon Kodoshi Corp. developed a technology to increase the heat
resistance of lithium-ion battery used for electric vehicles. The new
technology not only eliminates the necessity of a device to cool the
lithium-ion battery for lower power consumption but also makes the auto body
lighter. Accordingly, the distance per charge can be increased by 30-40%. At
the same time, it can prevent an accident due to ignition and increase the
safety of lithium-ion battery. A lithium-ion battery deteriorates the
performance should temperature rise above 45 degrees centigrade. To avoid the
deterioration, an electric vehicle carries a cooling device. Because the
cooling device runs at its full capacity in summer, the distance per charge
decreases by 30%. Without a cooling device, the temperature of a lithium-ion
battery rises close to 60 degrees centigrade.
Daikin
developed highly heat resistant electrolyte and electrode in alliance with
Kansai University. They used fluorine for the substance of electrolyte and
confirmed that it worked without any problem at 60 degrees centigrade. They
adopted a highly heat resistant adhesive for the electrode to prevent the adhesive
from eluting off. They have already shipped trail electrolyte to auto maker and
battery makers. The technology is scheduled to be put into practical use in
2020.
Nippon
Kodoshi developed increase the heat resistance of electrode and separate in
alliance with Advance Industrial Science and Technology. They processed plant
fibers elaborately and developed a separator that neither shrinks nor decreases
the performance at a high temperature as the existing resin film. At the same
time, they adopted a highly heat resistant adhesive. The company has already
started to ship samples with a view to putting the technology into practical
use in five years.
An electric vehicle jointly developed by
Daikin and Mercedes-Benz Japan
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