The biggest single cost of Electric cars is the battery, however batteries continue to reduce in price as the numbers produced increase. As investment in Research and Development accelerates the prices will decrease. It’s anticipated by researchers that new EV battery chemistries are being adopted faster than in the past.
Price parity between EVs and internal combustion vehicles is reached by the mid-2020s in most segments, but there is a wide variation between geographies. The first segment (large cars in Europe) crosses by 2022 See Bloomberg‘s report.
See Will electric cars reduce in price? for more information.