Abstract: A battery pack having a population of secondary battery cells chargeable between a charged state and a discharged state, and a frame to hold secondary battery cells in the battery pack is provided, members of the population of secondary battery cells having an electrode assembly comprising a substantially polyhedral shape, and where the frame holds a cell array comprising a subset of the population of secondary batteries that are arranged adjacent to one another. A sealed secondary battery cell, electrode assembly, and methods of charging are also described.

Abstract: A battery pack having a population of secondary battery cells chargeable between a charged state and a discharged state, and a frame to hold secondary battery cells in the battery pack is provided, members of the population of secondary battery cells having an electrode assembly comprising a substantially polyhedral shape, and where the frame holds a cell array comprising a subset of the population of secondary batteries that are arranged adjacent to one another. A sealed secondary battery cell, electrode assembly, and methods of charging are also described.

Abstract: A sealed secondary battery cell chargeable between a charged state and a discharged state is provided. The sealed secondary battery cell comprises a hermetically sealed case, an electrode assembly enclosed by the hermetically sealed case, and a rated capacity of at least 100 mAmp·hr, The hermetically sealed case has opposing first and second case ends separated in the longitudinal direction, and a case sidewall that connects the first and second case ends, the opposing first and second case ends and case sidewall forming a hermetic seal about the electrode assembly, wherein the case sidewall comprises upper and lower sidewalls separated from each other in the vertical direction, and first and second transverse sidewalls that are separated from each other in the transverse direction.

Abstract: A sealed secondary battery cell that is chargeable between a charged state and a discharged state is provided. The sealed secondary battery cell comprises a hermetically sealed enclosure comprising a polymer enclosure material, an electrode assembly enclosed by the hermetically sealed enclosure, a set of electrode constraints, and a rated capacity of at least 100 mAmp·hr. A thermal conductivity of the secondary battery cell along a thermally conductive path between the vertically opposing regions of the external vertical surfaces of hermetically sealed enclosure in the vertical direction is at least 2 Wm·K.

Abstract: A battery pack having a population of secondary battery cells chargeable between a charged state and a discharged state, and a frame to hold secondary battery cells in the battery pack is provided, members of the population of secondary battery cells having an electrode assembly comprising a substantially polyhedral shape, and where the frame holds a cell array comprising a subset of the population of secondary batteries that are arranged adjacent to one another. A sealed secondary battery cell, electrode assembly, and methods of charging are also described.