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CN-122025422-A - Capacitor

CN122025422ACN 122025422 ACN122025422 ACN 122025422ACN-122025422-A

Abstract

The invention discloses a capacitor, which comprises a shell, a capacitor core, an electrode assembly, an electrode, a transfer electrode and a copper or copper alloy material, wherein the shell is provided with a containing cavity, the capacitor core is arranged in the containing cavity, the electrode assembly comprises an external electrode, an internal electrode and the transfer electrode, the internal electrode is made of aluminum or aluminum alloy material, the internal electrode is arranged in the containing cavity, the transfer electrode is made of a solderable conductive material, the transfer electrode is provided with a main body and a welding needle, the welding needle is in braze welding connection with the capacitor core, the main body is fixedly connected with the internal electrode in an overlapping mode to realize electric conduction between the capacitor core and the internal electrode, the external electrode is made of the copper or copper alloy material, and the external electrode is fixedly connected with the internal electrode to lead out electric power of the capacitor core. The capacitor reduces the material proportion of the electrode copper material through the electrode structure design, ensures the connection reliability of the electrode and the core, and finally reduces the cost on the premise of keeping the performance of the film capacitor.

Inventors

  • CHEN GUOBIN
  • GUO LEQIANG
  • CHEN YUANWEI

Assignees

  • 厦门法拉电子股份有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (14)

  1. 1. A capacitor, comprising: A housing having a receiving cavity; a capacitor core disposed in the accommodation chamber; The electrode assembly comprises an external electrode, an internal electrode and a transfer electrode, wherein the internal electrode is made of aluminum or an aluminum alloy material and is arranged in the accommodating cavity, the transfer electrode is made of a solderable conductive material and is provided with a main body and a welding needle, the welding needle is in braze joint with the capacitor core, the main body and the internal electrode are fixedly connected in an overlapping mode to achieve electric conduction between the capacitor core and the internal electrode, the external electrode is made of a copper material or a copper alloy material, and the external electrode is fixedly connected with the internal electrode to lead out electric power of the capacitor core.
  2. 2. The capacitor of claim 1, wherein the main body of the transfer electrode has a strip-like, block-like or plate-like structure, wherein the plurality of bonding pins extend from a predetermined edge of the main body in a direction perpendicular to a thickness direction of the main body at a spacing, and wherein the plurality of bonding pins extend from the predetermined edge of the main body in a direction perpendicular to the thickness direction of the main body, when the main body has a block-like structure.
  3. 3. The capacitor of claim 1 wherein said pins are curved.
  4. 4. A capacitor as claimed in claim 3, wherein the pins are arcuate, wavy or continuously curved.
  5. 5. The capacitor of claim 3 wherein said transfer electrode is in the shape of a strip, said transfer electrode having a plurality of said pins, said pins being spaced apart and juxtaposed and being bent from a main body of said transfer electrode in the shape of a strip in a direction orthogonal to a longitudinal direction of said main body.
  6. 6. The capacitor of claim 3 wherein said transfer electrode is needle-shaped, said transfer electrode having one of said pins, said pins being bent from a main body of said transfer electrode in a direction orthogonal to a longitudinal direction of said main body.
  7. 7. The capacitor of claim 1, wherein the inner electrode has a hollowed-out hole formed at a position corresponding to the bonding pin.
  8. 8. The capacitor of claim 1 wherein the solderable conductive material is pure copper, brass, tin-plated copper, nickel-plated copper, tin-plated steel, tin-plated aluminum, or nickel-plated aluminum.
  9. 9. The capacitor of claim 1 wherein said outer electrode is fixedly connected to said inner electrode by laser welding, ultrasonic welding, molecular diffusion welding, brazing, or mechanical riveting.
  10. 10. The capacitor of claim 1 wherein said inner electrode is lap-fixed to said body by laser welding, ultrasonic welding, molecular diffusion welding, brazing, or mechanical riveting.
  11. 11. A capacitor as claimed in claim 1 or 3, wherein the number of said capacitor cores is one or more, and a plurality of said capacitor cores are arranged in said housing cavity in a single row or a plurality of rows, each of said capacitor cores corresponding to at least one of said bonding pins.
  12. 12. The capacitor of claim 1, further comprising a filler material filled within the receiving cavity and cured within the receiving cavity.
  13. 13. The capacitor of claim 2 wherein said bond pins are rectilinear in shape.
  14. 14. The capacitor of claim 1, wherein the thickness of the transfer electrode is less than the thickness of the inner electrode.

Description

Capacitor Technical Field The invention relates to the technical field of capacitors, in particular to a capacitor. Background The thin film capacitor is one of electronic components used in a large amount in electronic equipment, is widely applied to the fields of blocking, coupling, bypass, filtering, tuning loops, energy conversion and control circuits and the like, and is also widely applied to the fields of new energy sources such as photovoltaics, solar energy, electric automobiles and the like. The electrode of the existing film capacitor mainly uses copper materials, and the excellent electric conductivity, heat conductivity, stability and moderate mechanical property of copper can ensure the good performance of the capacitor. However, in recent years, copper prices have risen dramatically, resulting in an increase in cost of thin film capacitors. How to reduce the copper consumption and balance the quality and cost of the electrode is one of the important paths for industry cost reduction. The existing cost reduction design attempts to replace the internal electrode with aluminum by copper, but when the aluminum is not subjected to surface treatment (surface tin plating or nickel plating), the welding with the core is difficult to realize, and if the surface of the internal aluminum electrode is treated, additional cost is added, so that the cost and the performance cannot be effectively balanced. Disclosure of Invention The present invention aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, the invention aims to provide a capacitor, which reduces the material specific gravity of an electrode copper material through the structural design of an electrode, ensures the connection reliability of the electrode and a core, and finally reduces the cost on the premise of keeping the performance of a film capacitor. To achieve the above object, an embodiment of the present invention provides a capacitor including: A housing having a receiving cavity; a capacitor core disposed in the accommodation chamber; The electrode assembly comprises an external electrode, an internal electrode and a transfer electrode, wherein the internal electrode is made of aluminum or an aluminum alloy material and is arranged in the accommodating cavity, the transfer electrode is made of a solderable conductive material and is provided with a main body and a welding needle, the welding needle is in braze joint with the capacitor core, the main body and the internal electrode are fixedly connected in an overlapping mode to achieve electric conduction between the capacitor core and the internal electrode, the external electrode is made of a copper material or a copper alloy material, and the external electrode is fixedly connected with the internal electrode to lead out electric power of the capacitor core. According to the capacitor, the defect that the inner electrode of aluminum/aluminum alloy cannot be directly brazed with the capacitor core is overcome by additionally arranging the transfer electrode, reliable electric conduction of the aluminum electrode with low cost and light weight and the copper outer electrode with high conductivity and easy welding is achieved, the double-connection structure of brazing and lap joint of the transfer electrode ensures high-strength connection of the capacitor core and the transfer electrode, low-resistance conduction of the transfer electrode and the inner electrode is achieved, the inner electrode adopts low-cost aluminum materials to replace pure copper, the outer electrode keeps excellent welding performance of copper materials, material cost and terminal application convenience are considered, overall material cost is reduced, material proportion of the copper materials of the electrode can be reduced, cost of the electrode is reduced, meanwhile reliability of connection of the electrode and the core is guaranteed, and cost is finally reduced on the premise that performance of the film capacitor is kept. In addition, the capacitor according to the embodiment of the present invention may further have the following additional technical features: The electrode comprises a main body, a plurality of welding pins and one welding pin, wherein the main body is of a strip-shaped, block-shaped or plate-shaped structure, the welding pins are arranged in parallel at intervals and extend from the specified edge of the main body to the direction orthogonal to the thickness direction of the main body when the main body is of a block-shaped structure, and the welding pins are arranged in one piece and extend from the specified edge of the main body to the direction orthogonal to the thickness direction of the main body when the main body is of a block-shaped structure. Optionally, the welding needle is curved. Further, the welding needle is in an arc shape, a wave shape or a continuous curve shape. The transfer electrode is strip-shaped,