Secondary battery cells having hermetically sealed enclosure,electrode assemblies and methods

A device for energy storage and for energy release, the device comprising:

• an electrode assembly comprising:
• (A) an electrode structure comprising an electrode current collector having (a) an electrode current collector body region and (b) an electrode current collector end region, the electrode current collector end region being bounded by, and extending from, a transverse end of the electrode current collector body region, the transverse end of the electrode current collector body region being along a transverse direction,
• (B) a counter-electrode structure stacked with the electrode structure along a longitudinal direction normal to the transverse direction, the counter-electrode structure being separated from the electrode structure along the longitudinal direction, the electrode current collector body region having a first height along a vertical direction normal to the transverse direction and normal to the longitudinal direction, the electrode current collector end region having a second height different from the first height,
• (C) an electrode busbar disposed along the longitudinal direction, the electrode busbar being operatively coupled with a surface of the electrode current collector, the surface having (a) a first surface portion of the electrode current collector body region, the first surface portion being disposed normal to the longitudinal direction, and (b) a second surface portion of the electrode current collector end region, the second surface portion being disposed towards, or along, the longitudinal direction;
• and
• a constraint system comprising oblong apertures, the electrode assembly being disposed in an interior space of the constraint system.