# US 2021/0241978 A1 · Cathode subassembly with integrated separator for electrolytic capacitor, and method of manufacture thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0241978 A1 - Document ID: US20210241978A1 - Status: Published application - Kind: A1 - Application number: 17/236,999 - Filed: 2021-04-21 - Published: 2021-08-05 - Earliest claimed: 2018-01-17 - Assignees: Pacesetter, Inc. - Applicants: Pacesetter, Inc. - Inventors: David R. Bowen; Ralph Jason Hemphill; Thomas F. Strange; Troy L. McCurry; Peter Fernstrom - Web page: https://patentgrep.com/patent/US20210241978A1 ## CPC - H01G 9/0425: {specially adapted for cathode} - H01G 9/008: Terminals - H01G 9/02: Diaphragms; Separators - H01G 9/048: characterised by their structure (H01G11/22 takes precedence) - H01G 9/10: Sealing, e.g. of lead-in wires - H01G 9/14: Structural combinations {or circuits} for modifying, or compensating for, electric characteristics of electrolytic capacitors - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) ## Abstract A cathode subassembly for use in an electrolytic capacitor may include a first separator sheet including a surface having first and second regions, where the second region extends from a perimeter of the first region to a first peripheral edge of the first sheet, a second peripheral edge of a second sheet is substantially aligned with the first peripheral edge, a conductive foil is sandwiched between the first and second sheets and disposed within the first region, the first and second sheets are adhered to each other in a sealing region extending from the second region to a region of a surface of the second sheet facing the second region, and the first sheet includes at least one first recess portion at the first peripheral edge aligned with at least one second recess portion at the second peripheral edge of the second sheet. ## Claims ### Claim 1 A device comprising: a conductive anode; a dielectric material disposed on a surface of the conductive anode; a cathode subassembly, wherein the cathode subassembly includes: a first separator sheet including a surface having a first region and a second region, wherein the second region extends from a perimeter of the first region to a first peripheral edge of the first separator sheet; a cathode; and a second separator sheet having a second peripheral edge, wherein the second peripheral edge is substantially aligned with the first peripheral edge, and wherein the cathode is sandwiched between the first and second separator sheets and disposed within the first region, and wherein the first and second separator sheets are adhered to each other in a sealing region extending from the second region of the first separator sheet to a region of a surface of the second separator sheet facing the second region, and wherein the first separator sheet includes at least one first recessed portion at the first peripheral edge aligned with at least one second recessed portion at the second peripheral edge of the second separator sheet; and an electrolyte disposed between the anode and the cathode subassembly, wherein the first and second peripheral edges respectively of the first and second separator sheets are aligned with a peripheral edge of the anode. ### Claim 2 (depends on 1) The device of claim 1 wherein the substantial alignment of the second peripheral edge with the first peripheral edge is such that the first peripheral edge is within +/−0.05 to 0.002 of the second peripheral edge. ### Claim 3 (depends on 1) The device of claim 1, wherein the first and second peripheral edges respectively of the first and second separator sheets have the same shape as the peripheral edge of the anode. ### Claim 4 (depends on 1) The device of claim 1, further comprising: a plurality of conductive anodes arranged in a stack formation with the cathode subassembly. ### Claim 5 (depends on 1) The device of claim 1, wherein the device is an electrolytic capacitor. ### Claim 6 (depends on 1) The device of claim 1, wherein the first and second separator sheets are permeable to the electrolyte. ### Claim 7 (depends on 1) The device of claim 1, wherein the anode includes an anode recessed portion at the peripheral edge of the anode, and the anode recessed portion, the first recessed portion, and the second recessed portion being aligned. ### Claim 8 (depends on 1) The device of claim 1, wherein the peripheral edge of the anode is retracted from the first peripheral edge of the first separator sheet. ### Claim 9 (depends on 1) The device of claim 1, wherein the anode includes an anode recessed portion at the peripheral edge of the anode, a peripheral edge of the cathode includes a third recessed portion, and the anode recessed portion, the first recessed portion, the second recessed portion, and the third recessed portion are aligned. ### Claim 10 (depends on 9) The device of claim 9, wherein an alignment element is received in the anode recessed portion, the first recessed portion, the second recessed portion, and the third recessed portion. ### Claim 11 (depends on 10) The device of claim 10, wherein a portion of the sealing region received in the interior of the third recessed portion is between the alignment element and the third recessed portion. ### Claim 12 (depends on 1) The device of claim 1, wherein the cathode includes a cathode tail that extends through the sealing region and an aperture extends through the cathode tail. ### Claim 13 (depends on 12) The device of claim 12, wherein an alignment element is received in the aperture. ### Claim 14 (depends on 13) The device of claim 13, wherein the cathode is one of multiple cathodes included in the device that each has a tail region with an aperture extends through the cathode tail, the alignment element is received in each of the apertures. ### Claim 15 (depends on 13) The device of claim 13, wherein a peripheral edge of the cathode is spaced apart from the sealing region. ### Claim 16 (depends on 1) The device of claim 1, wherein the cathode includes a cathode tail that extends through the sealing region, a peripheral edge of the cathode includes multiple third recessed portions and the sealing region is positioned in an interior of each of the third recessed portions, and the tail is positioned between two of the third recessed portions. ### Claim 17 (depends on 16) The device of claim 16, wherein the tail is positioned between the third recessed portions such that a peripheral edge of the tail is continuous with the third recessed portions. ### Claim 18 (depends on 16) The device of claim 16, wherein another one of the third recessed portions is positioned on a side of the peripheral edge of the cathode that is opposite from the two recessed portions. ### Claim 19 (depends on 1) The device of claim 1, wherein the cathode includes a cathode tail that extends through the sealing region, a peripheral edge of the cathode includes a third recessed portion and the sealing region is positioned in an interior of the third recessed portion, and the third recessed portion is positioned on a side of the peripheral edge of the cathode that is opposite from the cathode tail. ### Claim 20 (depends on 19) The device of claim 19, wherein the first recessed portion and the second recessed portion are received in the third recessed portion.