Batteries including a flat plate design

Abstract

A battery having flat, stacked, anode and cathode layers. The battery can be adapted to fit within an implantable medical device.

1 . A battery stack comprising:
 a plurality of alternating anode and cathode layers, each of the anode layers having a base layer, the anode layer including an anode tab extending from a first position, the anode tab having a thickness greater than a thickness of the anode base layer; and   wherein each cathode layer includes a cathode tab extending from a second position.   
     
     
         2 . The battery stack of  claim 1 , wherein each of the anode and cathode layers includes a substantially non-rectangular shape. 
     
     
         3 . The battery stack of  claim 1 , wherein the cathode material layer includes MnO2. 
     
     
         4 . The battery stack of  claim 3 , wherein the MnO2 layer does not cover the cathode tab. 
     
     
         5 . The battery stack of  claim 1 , wherein the base layer includes a metal sheet. 
     
     
         6 . The battery stack of  claim 1 , further including a separator layer between each anode layer and each cathode layers. 
     
     
         7 . The battery stack of  claim 6 , wherein an outer perimeter edge surface of each cathode layer is offset from an outer perimeter edge surface of each anode layer that is adjacent to the cathode layer. 
     
     
         8 . The battery stack of  claim 7 , wherein the outer perimeter of each cathode layer is completely offset from the outer perimeter of each anode layer. 
     
     
         9 . The battery stack of  claim 6 , wherein each separator is connected to an adjacent separator to form a substantially sealed pocket around each cathode layer. 
     
     
         10 . The battery stack of  claim 9 , wherein the tab of each cathode layer is exposed beyond the substantially sealed pocket. 
     
     
         11 . The battery stack of  claim 1 , wherein each cathode layer has a first separator on one side and a second separator on a second side, wherein the first separator and the second separator are connected to each other around at least a portion of their edges. 
     
     
         12 . The battery stack of  claim 11 , wherein the first separator and the second separator define a flange at the connection of the first separator and the second separator, wherein the flange extends beyond an edge of the cathode layer and encloses the edge of the cathode layer. 
     
     
         13 . The battery stack of  claim 12 , wherein the connection between the first separator and the second separator includes a heat seal. 
     
     
         14 . The battery stack of  claim 1 , wherein each of the plurality of cathode layers is stacked such that the cathode tabs of each cathode layer overlay one another and wherein each of the plurality of anode layers is stacked such that the anode tabs of each anode layer overlay one another. 
     
     
         15 . The battery stack of  claim 1 , wherein the anode tabs are approximately as thick as a combined thickness of the anode base layer and the anode material layer.