Solid electrolytic capacitor assembly with multiple cathode terminations
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01G-004/228
H01G-009/00
출원번호
US-0841453
(2010-07-22)
등록번호
US-8125769
(2012-02-28)
발명자
/ 주소
Djebara, Lotfi
출원인 / 주소
AVX Corporation
대리인 / 주소
Dority & Manning, P.A.
인용정보
피인용 횟수 :
3인용 특허 :
57
초록▼
A capacitor assembly containing a solid electrolytic capacitor element and an anode lead extending in a direction therefrom, first and second cathode terminations, and an anode termination is provided. The first cathode termination contains a first portion that is substantially parallel to a lower s
A capacitor assembly containing a solid electrolytic capacitor element and an anode lead extending in a direction therefrom, first and second cathode terminations, and an anode termination is provided. The first cathode termination contains a first portion that is substantially parallel to a lower surface of the capacitor element and in electrical contact therewith, and the second cathode termination contains a second portion that is substantially parallel to an upper surface of the capacitor element and in electrical contact therewith. Through such a “sandwich” configuration, the degree of surface contact between the cathode terminations and capacitor element is increased, which can help dissipate heat and allow it to handle higher currents that would normally cause overheating. The terminations may also provide increased mechanical support.
대표청구항▼
1. A capacitor assembly comprising: a capacitor element that includes an anode, dielectric layer overlying the anode, and a cathode overlying the dielectric layer that includes a solid electrolyte, wherein the capacitor element defines an upper surface and an opposing lower surface;an anode lead ext
1. A capacitor assembly comprising: a capacitor element that includes an anode, dielectric layer overlying the anode, and a cathode overlying the dielectric layer that includes a solid electrolyte, wherein the capacitor element defines an upper surface and an opposing lower surface;an anode lead extending in a direction from the capacitor element and electrically connected to the anode;a first anode termination that is electrically connected to the anode lead, the first anode termination containing a third portion positioned at an angle relative to the direction of the anode lead, the third portion defining an upwardly facing recess that receives a lower section of the anode lead;a second anode termination that contains a fourth portion positioned at an angle relative to the direction of the anode lead, the fourth portion defining a downwardly facing recess that receives an upper section of the anode lead;a first cathode termination that contains a first portion that is substantially parallel to and in electrical contact with the lower surface of the capacitor element;a second cathode termination that contains a second portion that is substantially parallel to and in electrical contact with the upper surface of the capacitor element; anda case that encapsulates the capacitor element and leaves exposed at least a portion of the first cathode termination, second cathode termination, first anode termination, or a combination thereof. 2. The capacitor assembly of claim 1, wherein the anode lead is positioned between and in electrical contact with the upwardly and downwardly facing recesses. 3. The capacitor assembly of claim 2, wherein the recesses are mated together. 4. The capacitor assembly of claim 2, wherein the upwardly facing recess, the downwardly facing recess, or both, have a U-shape. 5. The capacitor assembly of claim 1, wherein the anode includes tantalum, niobium, or an electrically conductive oxide thereof. 6. The capacitor assembly of claim 1, wherein the solid electrolyte includes manganese dioxide, a conductive polymer, or a combination thereof. 7. A method for forming a capacitor assembly, the method comprising: providing a solid electrolytic capacitor element from which extends an anode lead in a direction;positioning the capacitor element onto a first leadframe that contains a first anode termination and a first cathode termination, wherein the first cathode termination contains a first portion that is substantially parallel to a lower surface of the capacitor element and in electrical contact therewith, and wherein the first anode termination contains a recess within which the anode lead is received;electrically connecting the anode lead to the first anode termination, the first anode termination containing a third portion positioned at an angle relative to the direction of the anode lead, the third portion defining an upwardly facing recess that receives a lower section of the anode lead;positioning a second leadframe onto the capacitor element that contains a second cathode termination, wherein the second cathode termination contains a second portion that is substantially parallel to an upper surface of the capacitor element and in electrical contact therewith, wherein the second leadframe further comprises a second anode termination that contains a fourth portion positioned at an angle relative to the direction of the anode lead, the fourth portion defining a downwardly facing recess that receives an upper section of the anode lead; andelectrically connecting the capacitor element to the first and second cathode terminations. 8. The method of claim 7, wherein a conductive adhesive is disposed between the first portion of the first cathode termination and the lower surface of the capacitor element. 9. The method of claim 7, wherein a conductive adhesive is disposed between the second portion of the second cathode termination and the upper surface of the capacitor element. 10. The method of claim 7, wherein the anode lead is laser welded to the first anode termination at the recess. 11. The method of claim 7, wherein the anode lead is positioned between and in electrical contact with the upwardly and downwardly facing recesses. 12. The method of claim 11, wherein the recesses are mated together. 13. The method of claim 7, wherein the recess has a U-shape. 14. The method of claim 7, further comprising encapsulating the capacitor element in a case so that at least a portion of the first cathode termination, second cathode termination, first anode termination, or a combination thereof, remain exposed. 15. The method of claim 7, wherein the capacitor element includes an anode, dielectric layer overlying the anode, and a cathode overlying the dielectric layer that includes a solid electrolyte.
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