Electrochemical accumulator, with planar architecture obtained in part by printing

A process for producing a metal-ion accumulator, comprising the following steps:

• a/ providing a metal element that forms a current collector of an electrode of one polarity;
• b/ depositing, on the metal element, an electrically insulating layer according to an interlocking pattern;
• c/ depositing, on the electrically insulating layer, a layer forming a current collector of an electrode of opposite polarity to the one having the current collector formed by the metal element, the current collector layer being deposited on the interlocking pattern of the electrically insulating layer;
• d/ depositing, on the metal element, a layer of electrode active material according to a pattern at least partly interlocked in the interlocking pattern;
• e/ depositing, on the current collector layer, a layer of electrode active material of opposite polarity to the one deposited on the metal element, according to the interlocking pattern;
• f/ depositing an electrolyte layer at least in the spaces separating the two layers of active material of mutually opposite polarity.