PD test Voltage is selected based on BDV test. Is 50% of the BDV Max Voltage test a good test Voltage for customers manufacturing test ? How do we explain this to customers, is there any theory to why we select 50% versus 30% or 80%?.

The test voltage is decided by customer. the test voltage relates to the distance between anode and cathode which also close to (not equal to) the thickness of separator. So considering the separator and the process for LIB cell testing, we normally suggest customer to set test voltage >350V.