[CentOS] LVM encryption and new volume group

Hello list,

I bought a Thinkpad T420 and installed CentOS 7 recently.

I choosed to use lvm encryption for the entire volume group. It works so far.

But now I am planning to install a second hard disk. My thought is to create a new volume group on this additional disk.

But how can I integrate/do this according to the existing encryption so that it will be decrypted by the same passphrase I use at startup?

Regards and thanks in advance
Tim