Pressure relief cap for battery module

A battery module, comprising:

• a housing including:
• a first end plate defining a first end of the battery module;
• a second end plate defining a second end of the battery module opposite the first end;
• a first side plate coupled to the first end plate and the second end plate;
• and
• a second side plate opposite to the first side plate, the second side plate being coupled to the first end plate and the second end plate;
• a plurality of battery cells secured within the housing between the first end plate, the second end plate, the first side plate, and the second side plate;
• a cover surrounding the plurality of battery cells, the cover forming a first substantially fluid-tight seal with the first end plate and a second substantially fluid-tight seal with the second end plate;
• a base plate coupled to the first end plate, the base plate having a through-opening and an inner surface facing the through-opening;
• and
• a pressure relief cap forming a third substantially fluid-tight seal with the first end plate, wherein the pressure relief cap is coupled with the base plate, and wherein the pressure relief cap is adapted to disengage from the base plate upon an internal pressure within the battery module exceeding a pressure threshold, the pressure relief cap including:
• a body including:
• a base portion defining a first thickness;
• a first circular projection defining a second thickness that is lesser than the first thickness of the base portion, wherein the first circular projection extends orthogonally from the base portion;
• and
• a second circular projection extending orthogonally from the base portion, wherein the second circular projection is concentric with the first circular projection.

A method of venting a battery module, the method comprising:

• coupling, via at least one of an interference fit and a friction fit, a pressure relief cap with a base plate of the battery module, the pressure relief cap including a body including a base portion, a first circular projection extending orthogonally from the base portion, and a second circular projection extending orthogonally from the base portion, wherein the second circular projection is concentric with the first circular projection;
• disengaging the pressure relief cap from the base plate upon an internal pressure within the battery module exceeding a pressure threshold;
• and
• venting the internal pressure within the battery module via a through-opening in the base plate based on the disengagement of the pressure relief cap from the base plate.