link voltage and link capacitor basics
A typical EV has 300-400 Volt battery rather than 48V although some mild-hybrids do use 48V.

The converter is DC to AC not AC to DC and referred to as the inverter.  The link capacitor is part of the inverter and would not be externally accessible

The Link capacitor may have a value of a few hundred microfarads. It will take a second or so to precharge through a separate relay and resistor to limit the current. When it is charged the main contactor engages and shorts out the resistor and precharge relay to provide full power to the inverter.

If the capacitor was not precharged the main contactor inside the battery could suffer damage to its contacts through excessive current - burning or welding them together.