Microbattery and method for manufacturing a microbattery

A microbattery comprising an assembly of thin films successively forming, starting from a first substrate, a first current collector, a first electrode, an electrolyte, a second electrode, a second current collector, and a second substrate, wherein the second electrode is formed by a brazed joint and is configured to mechanically connect the first substrate with the second substrate.

A method for manufacturing a microbattery comprising the following steps of:

• forming a stack of thin films on a first substrate comprising, successively, starting from the first substrate, a first current collector, a first electrode, an electrolyte, and a first metal film,
• forming a second current collector on a face of a second substrate, and
• forming a second electrode, said step of forming the second electrode comprising an assembly step of said first and second substrates by soldering the first metal film and the second current collector together using at least one solder ball previously deposited on a contact face of the first metal film or on a contact face of the second current collector, said first and second substrates being placed facing each other during the assembly step.