Battery module bus bar carrier having guide extensions system and method

A battery module, comprising:

• a housing having an interior surface;
• a stack of electrochemical cells disposed in the housing, the stack including;
• a first end and a second end opposite the first end, the first end having terminals of the electrochemical cells,
• a first surface and a second surface of a first electrochemical cell and a second electrochemical cell, respectively, the first surface and the second surface extending between the first end and the second end of the stack;
• a plurality of bus bars;
• and
• a bus bar carrier supporting the plurality of bus bars, the bus bar carrier being adjacent to the first end of the stack such that the plurality of bus bars interfaces with the terminals of the first end, the bus bar carrier having a first guide extension and a second guide extension, the first guide extension including a third surface and a fourth surface opposite the third surface, the second guide extension including a fifth surface and a sixth surface opposite the fifth surface, the third surface physically contacting the first surface, the fourth surface physically contacting the interior surface of the housing, and the fifth surface physically contacting the second surface, wherein the fifth surface and the sixth surface are tapered from the bus bar carrier toward a distal tip of the second guide extension such that a base of the second guide extension includes a larger thickness than the tip of the second guide extension, and wherein the fifth surface and sixth surface each extend between the base and the tip of the second guide extension.