Power source assembly systems and methods

A power source assembly method comprising:

• applying a compressive force on a plurality of battery cells using a compression mechanism, wherein the compression mechanism comprises sets of moveable arms, wherein the sets of moveable arms are configured to transverse through at least a guide independently to apply compressive force to the plurality of battery cells, and wherein the sets of moveable arms are configured to abut a surface of the plurality of battery cells enabling each battery cell of the plurality of battery cells to be in direct abutment with an adjacent battery cell of the plurality of battery cells, wherein each battery cell includes a pouch cell;
• inserting at least a portion of the compressed plurality of battery cells into a container, wherein the sets of moveable arms are configured to traverse along the at least a guide to move the compressed plurality of battery cells toward the container, and wherein the container further comprises:
• a groove disposed along an inner surface of the container and configured to engage a complimentary rib disposed along a bottom of the plurality of battery cells;
• a sense board configured to detect a humidity of the battery cells;
• and
• an ejecta barrier comprising carbon fiber and configured to contain ejecta comprising lithium;
• engaging each of the battery cells of the plurality of battery cells with an end cap of the container, wherein the end cap is configured to maintain a predetermined arrangement of the plurality of battery cells, wherein the end cap comprises:
• a first protruding boss on a first end configured to mate with and snap into a receiving feature on a first end of the container;
• and
• a second protruding boss on a second end configured to mate with and snap into a receiving feature on the sense board;
• and
• releasing the compressive force from at least a portion of the plurality of battery cells.