I don’t know if this is exactly what you need, but I have drawn a quick shematic on how to switch such big relays with an arduino before here: Pacificmeister Build Info and CAD Sources .
But this schematic is only good if you do the antispark routine in software, like MaxMaker does it. PowerGlider’s solution above is more bulletproof.
As his LTSpice Simulation does not state actual components for the Mosfet used, I did a quick search for a fitting one. Probably most Mosfets that have a breakdown voltage higher than the battery voltage plus the inductive peak from switching off will work, after all the continous current through the Fet is only about 1A.
The first suitable device I found was this one: https://de.farnell.com/on-semiconductor/fdp3651u/mosfet-n-kanal-to-220/dp/1324799
But really depending on your electronics knowledge you might need more of a real schematic including Mosfet control, etc. To build the Solution by PowerGlider above.
I would not recommend using half the pack voltage for the relay. For me the 5 to 10Watts I remember that those relays pull cause too much of an imbalance in the pack. I would rather use a cheap buck converter set to 24 volts from the full pack voltage.