As automotive traction battery prototypes are very rare, expensive,
and dangerous to handle, a battery impedance emulation
circuit is used instead. Using a SPICE simulation model
very similar to the one shown in [21], which is derived via the
CM and DM impedances of the battery, a network of concentrated
elements is built up [22]. It is able to simulate the input
impedances of the HV automotive battery within a component
level EMC test setup. The emulation behaves in the same manner
as the battery investigated within the frequency range tested,
without having the drawbacks of real HV batteries: there are no
flammable chemicals inside and no energy stored. When the
power supply is switched OFF, the device is inherently safe.
As the system is powered by an external supply, there is no
recharging required and the state of charge (SOC) does not
change within the duration of the test. There is also no need
for a CAN communication or residual bus simulation, whose
emissions would interfere with the test requirements.