Patent ID: 7201986

Claim:
An electrochemical cell comprising: a continuous sheet of substrate material having first and second faces, the substrate material folded to form an undulating sheet having a first plurality of troughs on the first face and a second plurality of troughs on the second face, the troughs of the first plurality of troughs alternating with the troughs of the second plurality of troughs along the undulating sheet so that each trough of the first plurality of troughs has a first wall in common with a corresponding adjacent one of the second troughs; an ion-conducting region on each of the first walls, the ion-conducting regions allowing ions to pass through the substrate material between the corresponding first and second troughs; each of the first troughs comprising a first electrode in ionic-communication with the ion-conducting region; each of the second troughs comprising a second electrode in ionic-communication with the ion-conducting region; wherein: the first wall is electrically insulating, the substrate comprises a first electron-conducting region that allows electricity to pass through the substrate material, and the first electron conducting region is located in a second wall of each of the first troughs opposed to the first wall.