Solid state EV batteries nearer

BYD (allegedly) has just filed some new patents. BYD is working towards a future electric car that is designed for the mass markets (i.e. low cost, fast charging and decent range). I am sure other car manufacturers are racing to achieve this.

Toyota Solid State EV?

Recently Toyota announced a car with a solid state battery. The solid state battery has been delayed and delayed. 

This (somewhat sceptical) video examines the claims. Yes, solid state batteries could unlock far less expensive EVs with great range.