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Historically, electric cars have caught fire much less often than petrol cars (even accounting for the lower number of EV's on the road). Most of these have been from a single battery manufacturing line and caused by a single misaligned robot that placed the battery terminals too close together. These batteries have all been recalled under warranty.
There are battery types that are better for grid storage than hydrogen. One of the main drawbacks of hydrogen storage is its low round trip efficiency of around 30%.
Redox flow batteries are easily scalable, liquid metal batteries have very low maintenance costs and long lifespans, and sodium ion batteries are much cheaper than lithium ion batteries. It will be interesting to see if any of these options make mass market.
I’ve seen some videos about redox flow batteries and a bunch of other options that appear to be suitable for the grid. I’m really looking forward to seeingt hose in action, because I believe grid energy storage is absolutelyt crucial for getting rid of coal and oil.
However, even though converting electricity to something and then back to electricity is nice, there are many cases where you can take a shortcut. Various types of industry are using fossil fuels to produce heat, so if you give them electricity, they can produce heat when they need it. That’s not the only way, because you could also reduce the number of conversions by using the energy of windy and sunny days to produce heat and store it in hot sand. Later, when the factory needs the heat but the sun isn’t shining, they can just the heat stored in the sand.