Patent ID: 9627670
Date: 2017-04-18
CPC Classifications: H01M,Y02E,Y02P,Y02T,Y10T

Claim:
1. A method for making a battery cell in a stack of a plurality of layers, comprising: forming, starting from a first surface of a semiconductor substrate layer, at least a part of a first cavity corresponding to a first half-cell into the first surface, such that a bottom of the first cavity is defined by semiconductor material below the first surface; transforming semiconductor material forming the bottom of the first cavity into a porous membrane, such that the bottom of the first cavity is provided by the porous membrane; forming, starting from a second surface of the semiconductor substrate layer opposite the first surface, at least a part of a second cavity corresponding to a second half-cell into the second surface, such that a bottom of the second cavity is provided by the porous membrane capable of separating the first half-cell from the second half-cell of the battery cell, the porous membrane comprising channels allowing ions and/or an electrolyte to move between the first half-cell and the second half-cell; and forming further parts of the first half-cell and the second half-cell in a second separate layer and a third separate layer, respectively, wherein forming further parts of the first and the second half-cells comprises: stacking the semiconductor substrate layer and the second and third separate layers to obtain the battery cell or at least parts thereof by arranging the semiconductor substrate layer in between the separate second and third separate layers to obtain the stack comprising a structure of the battery cell, the structure comprising the first half-cell with the first electrode over the first cavity and defining a space between the first electrode and the bottom of the first cavity, the second half-cell with the second electrode over the second cavity and defining a space between the second electrode and the bottom of the second cavity, and the porous membrane in between the first and the second half-cell, wherein the second separate layer and the third separate layer are formed by a separate semiconductor wafer and/or a separate conductive foil.