Solid-State Batteries Will Transform EVs. Honda Starts Making Them in January A new demo line will let Honda test both design and production of its next-gen batteries, which are significantly more energy-dense than current units.

EV battery density is already cooling limited, especially in terms of charging speed. It doesn't matter if the battery can technically take larger input loads, the more power you dump into it, the more cooling overhead you need in the assembly. Unless you are planning to offload pack cooling onto the charger, but there is nothing like that in the works as far as I know. This is the same in terms of discharge as well - the higher the power density of the battery, the more difficult the cooling problem becomes - the total heat flux is the same, but it is in a smaller space, so there is just less physical surface area for removing it. I am still skeptical that solid state batteries will ever be cost effective for EVs tbh. The higher density with higher cooling overhead will only shrink packs a small amount, for a huge additional cost. Solid state batteries will revolutionize consumer portables and low power applications, and likely industrial-grade high power applications where cost sensitivity is not the same limiting factor.