Interconnect board frame for a battery module

An interconnect board frame for a battery module, the battery module having at least a first battery cell having a positive terminal and a negative terminal, includes a first frame member defining a first slot aligned with the positive terminal of the first battery cell, a second frame member connected to the first frame member, the second frame member defining a second slot aligned with the negative terminal of the first battery cell, and a puzzle joint defined by the connection of the first frame member and the second frame member, wherein the puzzle joint extends between the first slot and the second slot across a series connection between battery cells.