If you want to take the actual pack itself apart:
1) Be very careful. Like any sizable battery pack it can hurt you if you short something.
2) Remove all the screws.
3) SLOWLY pull it apart enough to get a non-conductive plastic knife or Popsicle stick into the crack.
4) Be careful of the temperature sensor on thin wires inside.
5) SLOWLY pry with the non-conductive tool until the glue gives way.