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Rather than getting all complicated with solenoids and airbag sensors, just use a contactor.
Beefy contactors are rated for high amperage and already are remotely operated switches. Put an inertia switch in-line with the power to the coil of the contactor.
If you smack into something, it will kill power to the coil, and the big springs pop the contactor open, killing all power on your EV circuit.
You could even get a fancy contactor that would have 3 seperate connections on it (each isolated from each other) and snake your battery cables to it. Then anytime the contactor is disengaged, your battery pack would be broken into three parts.
I was thinking about doing something similar to that to break a 144V pack in half for 72V charging.
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