| abstract |
Flat electrolytic capacitors and methods of making and using same in implantable medical devices (IMDs) are disclosed, the capacitors having a plurality of capacitor layers of an electrode stack formed of tailored numbers of anode and cathode layers to fill the available stack height space in the capacitor case. The capacitor is formed with a capacitor or electrode stack assembly having a stack assembly thickness or height H N that is tailored to fit a case wall height H cw of the capacitor case with minimal wasted space and allowance for any stack height tolerance t o . The electrode stack assembly comprises a plurality of N stacked capacitor layers each having a specified capacitor layer thickness or height. At least N 1 capacitor layers have a first capacitor layer thickness T 1 and N 2 capacitor layers have a second capacitor layer thickness T 2 where N=(N 1 +N 2 ), and H N =N 1 *T 1 +T 1 *N 2 . The N capacitor layers are preferably formed of a cathode layer, and anode sub-assembly and at least one separator layer comprising one or more separator sheet on either side of the cathode layer and the anode-layer sub-assembly. The anode sub-assemblies of the N 1 capacitor layers comprising x anode layers each having anode layer thickness t x stacked together, each anode layer having an anode layer thickness T x . The anode sub-assemblies of the N 2 capacitor layers comprising y anode layers each having anode layer thickness t y stacked together, each anode layer having an anode layer thickness T y . |