Flexible multi-battery assemblies, flexible electrochemical cells forming such assemblies, and methods of fabricating thereof

A flexible multi-battery assembly comprising:

• a first current collector, comprising a first inner surface and a first outer surface and parsed into a first plurality of current collector portions, not directly contacting each other;
• a second current collector, comprising a second inner surface and a second outer surface, wherein:
• the first inner surface and the second inner surface face each other, and
• the first outer surface and the second outer surface face away from each other;
• and
• the second outer surface is exposed;
• and
• a plurality of electrochemically active stacks, disposed between and directly contacting the first inner surface and the second inner surface, wherein:
• portions of the second inner surface, extending between the plurality of electrochemically active stacks are exposed,
• each of the plurality of electrochemically active stacks directly contacts one of the first plurality of current collector portions,
• each of the plurality of electrochemically active stacks is flexible and comprises a positive active material layer, an electrolyte layer, and a negative active material layer, and
• the second current collector is a continuous structure providing support to the plurality of electrochemically active stacks relative to each other.