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I don't understand your diagram.

All four of your cell modules need to be connected in parallel. They're not. Draw that first to form a "pack" that has one outgoing +/- pair of connections.

The disconnect goes between the pack and everything else connected to the pack (of four parallel modules). There also needs to be a fuse in that leg unless there's a girl/man in the fire brigade you're trying to meet up with.

The contactor then needs to switch that fused, disconnectable, leg on and off to the controller and any other HV stuff. That includes a DC-DC battery charger for your 12V.

Shunt placement depends on what current you want to measure. Charging current? Controller current? Both?
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