Identify different partitions on the same disk when storing the password of the encrypted partitions.

when unlocking multiple bitlocker encrypted partitions on the same disk with the "save password" checkbox ticked, the previous password will be overwritten by the latter one. So I can only save one password all the time. After checking the stored password in seahorse, I found the password was identified by the disk name. That's not enough to identify different partitions on the same disk.