Battery pack

A battery pack comprising:

• a plurality of battery cells;
• at least one cell retention structures comprising an upper cell retention structure and a lower cell retention structure respectively in engagement with upper and lower sides of the plurality of battery cells;
• wherein each of the at least one cell retention structures covers a plurality of busbars connecting terminals affixed at upper and lower sides of the battery pack;
• and
• wherein each of the plurality of busbars comprises at least one controlled failure region such that, when current through the corresponding busbar exceeds a predefined current value, a portion of the at least one controlled failure region fails and interrupts flow of current there through, thereby isolating the corresponding battery cell among the plurality of battery cells.

A battery pack comprising:

• a plurality of battery cells;
• at least one cell retention structures comprising an upper cell retention structure and a lower cell retention structure respectively in engagement with upper and lower sides of the plurality of battery cells;
• wherein each of the at least one cell retention structures covers a plurality of busbars connecting terminals affixed at upper side and lower side of the battery pack;
• and
• wherein the battery pack comprises a heating element disposed on at least one of the upper side and lower side of the battery pack adjacent the corresponding busbars to facilitate heating of the battery pack during cold operating conditions.