Slow Charging Solution in Cold
With a small change in the production process of the Li -ion batteries, these batteries can charge fast even at extremely low temperatures. Moreover, this technology The charging speed is five floors Increasing and the battery without reducing the energy density He succeeds. The method developed by the research team is the 6C charging speed Up to -10 ° C It makes it possible at temperatures. The letter ‘C’ here indicates the ratio of the charging speed according to the capacity of the battery. For example, in a battery with a capacity of 50 kWh, a charging speed of 1C means a charging of 50 kW, while the 6C charging speed means to charge with 300 kW (6 × 50 kW).
The reason why electric vehicles are charging more slowly in cold weather is that the lithium ions in the battery slow down between the electrodes, when moving through the liquid electrolyte. This slowdown reduces the charging speed and the power of the battery. Of course, this is not permanent.
Researchers at the University of Michigan drill tiny holes made with laser to solve this problem, allowing lithium ions to move faster on the graphite anode. However, this is not enough alone. The research team effectively increased the charging speed both at room temperature and very cold by covering a glass-like material containing lithium borat-carbonate on the graphite anode with laser. This invention enables quick charge even at temperatures below zero.
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