Bi-cell separation for improved safety

Abstract From the Canadian patent

Disclosed herein is a safety feature for batteries comprising an integrated series of lithium-ion bi-cells. Each individual bi-cell comprises sequentially, an anode, a film separator a cathode, a film separator, and an , anode. When multiple bi-cells are joined within a single package an insulator element, preferably an electrolyte permeable insulator element is placed , between anode elements of adjoining bi-cells. This insulator element appears to restrict internal shorting during crushing of the battery thus avoiding , undesirable effects of shorting such as thermal run-away and producing a safer battery.