Capacitor using welding type square anode cover plate

Abstract

The utility model discloses a capacitor using a welding type square anode cover plate, comprising a housing, a tantalum core, an insulation assembly and a cover plate, the tantalum core and the insulation assembly are arranged in the housing, the insulation assembly is respectively connected with the tantalum core and the cover plate, the tantalum core is provided with an anode leading-out terminal, the cover plate is respectively connected with the insulation assembly and the housing, and the anode leading-out terminal is provided with a cathode leading-out terminal. A connecting piece is arranged on the cover plate. The welding contact position of the cover plate anode and the tantalum wire is designed to be the square tantalum rod, point-to-point contact between the tantalum wire and the cover plate anode is optimized into point-to-face contact, the welding efficiency and the welding quality are improved under the condition that the welding strength of electric resistance welding is guaranteed, the resistance value of a contact resistor R is improved, and the welding quality is improved. And the welding pressure between the electrodes is greatly reduced, so that the mechanical stress impact borne by the glass insulator in the electric resistance welding process is reduced, and the high-energy hybrid tantalum capacitor with excellent electrical performance, high welding strength and high reliability is obtained.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor technology, and in particular relates to a capacitor using a welded anode cover plate. Background Technology

[0002] Existing technologies for high-energy hybrid tantalum capacitors with non-solid electrolytes employ a structure in which multiple tantalum anode cores and ruthenium dioxide cathode plates are alternately assembled within a tantalum casing. The casing and cover plate are sealed using laser welding technology. The positive electrode lead is connected to the cover plate anode via resistance welding using tantalum wires from the tantalum anode cores. The tantalum wires and cover plate anodes are cylindrical solid tantalum rods with diameters of 0.5 mm and 1.0 mm, respectively. During the resistance welding process, the electrodes clamp the tantalum wires and cover plate anodes together, and the heat generated by the current welds them together. This existing technology is difficult to implement and results in low welding quality and efficiency.

[0003] Since both the tantalum wire and the cover plate anode are cylindrical solid tantalum rods of different diameters, their contact point is small, resulting in a small contact area. This is determined by the welding heat formula: Q = I. 2 As shown in Rt, there are three drawbacks to using resistance welding to join the two components: 1. The resistance at the electrode clamping position of the tantalum wire is low, and the contact position between the tantalum wire and the tantalum rod is difficult to fix. Therefore, the pressure between the electrode, the tantalum wire, and the tantalum rod is low, resulting in poor welding effect. 2. When the tantalum wire and the cover plate anode have point-to-point contact, the small contact area leads to a large contact resistance R, resulting in a large heat Q required for welding, leading to poor welding effect. 3. To ensure welding strength, existing technologies increase the welding current I and the electrode welding pressure. Excessive welding pressure between the electrodes generates mechanical stress impact on the glass insulator, damaging its sealing performance and affecting the electrical performance and reliability of the capacitor. In summary, with the existing circular design technology used for the cover plate anode, the resistance welding process between the cover plate anode and the tantalum wire suffers from high welding difficulty, low welding efficiency, and poor welding effect. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a capacitor using a welded square anode cover plate.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a capacitor using a welded square anode cover plate, comprising a shell, a tantalum core, an insulating component, and a cover plate. The tantalum core and the insulating component are disposed inside the shell. The insulating component is connected to the tantalum core and the cover plate respectively. A positive lead is provided on the tantalum core. The cover plate is connected to the insulating component and the shell respectively. A connector is provided on the cover plate. The positive lead is connected to the connector. A sleeve is provided on the positive lead.

[0007] Preferably, the cover plate is provided with a through hole and a connecting hole, and the connecting piece penetrates the cover plate through the connecting hole.

[0008] Preferably, the connecting piece comprises an end portion and a tail portion, and the end portion is connected with the positive electrode lead end through the tail portion.

[0009] Preferably, the tail portion is in a rectangular cross section.

[0010] Preferably, the tantalum core comprises a first cathode sheet, a first anode block, a second cathode sheet, a second anode block and a third cathode sheet from bottom to top, the first cathode sheet is arranged at the bottom of the shell, and the third cathode sheet is connected with the insulation assembly.

[0011] Preferably, a first insulation layer is arranged between the first cathode sheet and the shell, and a second insulation layer is arranged between the first cathode sheet and the first anode block, between the first anode block and the second cathode sheet, between the second cathode sheet and the second anode block, between the second anode block and the third cathode sheet, and between the third cathode sheet and the insulation assembly.

[0012] Preferably, the insulation assembly comprises an insulation gasket, an adjusting gasket, a gasket and a grommet from bottom to top, and the grommet is connected with the cover plate.

[0013] Preferably, an insulation strip is arranged on the inner wall of the shell.

[0014] The utility model discloses beneficial effect lies in:

[0015] The utility model discloses the position of the cover plate anode and the tantalum wire welding contact is designed as square tantalum rod, and the point-to-point contact between the tantalum wire and the cover plate anode is optimized as the contact of the point to the surface, improves the welding efficiency and the welding quality under the condition that the resistance welding welding strength is guaranteed, through the improved square anode design, the contact area between the tantalum wire and the cover plate anode is increased, thereby improving the resistance value of contact resistance R, greatly reducing the welding pressure between the electrode, thereby reducing the mechanical stress impact that glass insulator bears in the resistance welding process, and the high-energy hybrid tantalum capacitor with excellent electrical performance, high welding strength and high reliability is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the structure schematic diagram of the utility model;

[0017] Fig. 2 It is the schematic diagram of the cover plate of the utility model;

[0018] Fig. 3 It is the structure schematic diagram of the cover plate and the connecting piece of the utility model;

[0019] In the diagram: 1-outer shell, 2-insulating strip, 3-first insulating layer, 4-first cathode plate, 5-second insulating layer, 6-first anode block, 7-second cathode plate, 8-second anode block, 9-third cathode plate, 10-sleeve, 11-insulating gasket, 12-adjusting shim, 13-shim, 14-washer, 15-cover plate, 151-through hole, 152-connecting hole, 16-positive lead-out end, 17-connector, 171-end, 172-tail. Detailed Implementation

[0020] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0021] Example:

[0022] like Figs. 1 to 3 As shown, a capacitor using a welded square anode cover plate includes a housing 1, a tantalum core, an insulating component, and a cover plate 15. The tantalum core and the insulating component are disposed inside the housing 1. The insulating component is connected to the tantalum core and the cover plate 15 respectively. A positive lead 16 is provided on the tantalum core. The cover plate 15 is connected to the insulating component and the housing 1 respectively. A connector 17 is provided on the cover plate 15. The positive lead 16 is connected to the connector 17. A sleeve 10 is provided on the positive lead 16, and the positive lead 16 passes through the sleeve 10, which serves as an insulator.

[0023] The cover plate 15 is provided with a through hole 151 and a connecting hole 152, and the connector 17 is connected through the connecting hole 152 through the cover plate 15.

[0024] The connector 17 includes an end portion 171 and a tail portion 172, wherein the end portion 171 is connected to the positive lead-out terminal 16 via the tail portion 172.

[0025] The tail portion 172 is a tantalum rod with a rectangular cross-section, and the cross-sectional area of ​​the tail portion 172 is larger than the cross-sectional area of ​​the end portion 171.

[0026] The connector 17 is the anode of the cover plate 15. The positive lead-out end 16 is connected to the anode of the cover plate 15 by resistance welding through a tantalum wire with a tantalum core. The diameter of the tantalum wire is Ф0.5mm. The end 171 of the connector 17 is a cylindrical solid tantalum rod with a diameter of Ф1.0mm.

[0027] The basic principle of resistance welding is to use the resistance heat generated by the current passing through the workpiece and the contact area as a heat source to locally heat the workpiece while applying pressure for welding. This is determined by the welding heat formula: Q = I. 2Rt, the cover plate uses a square tail 172, which increases the contact area between the tantalum wire of the anode block, thereby reducing the contact resistance R, thus reducing the required welding heat Q, and because the welding area is increased, the clamping pressure between the tail 172 and the anode block tantalum wire is reduced, thereby reducing the welding mechanical stress borne by the glass insulator cover plate 15, protecting the sealing and electrical performance of the capacitor.

[0028] The tantalum core comprises, from bottom to top, a first cathode sheet 4, a first anode block 6, a second cathode sheet 7, a second anode block 8, and a third cathode sheet 9, which are connected in sequence, the first cathode sheet 4 is arranged at the bottom of the shell 1, and the third cathode sheet 9 is connected with the insulating assembly.

[0029] A first insulating layer 3 is arranged between the first cathode sheet 4 and the shell 1, and a second insulating layer 5 is arranged between the first cathode sheet 4 and the first anode block 6, between the first anode block 6 and the second cathode sheet 7, between the second cathode sheet 7 and the second anode block 8, between the second anode block 8 and the third cathode sheet 9, and between the third cathode sheet 9 and the insulating assembly.

[0030] The insulating assembly comprises, from bottom to top, an insulating gasket 11, an adjusting gasket 12, a gasket 13, and a gasket 14, which are connected in sequence, the insulating gasket 11 is connected with the third cathode sheet 9, and the gasket 14 is connected with the cover plate 15.

[0031] An insulating tape 2 is arranged on the inner wall of the shell 1, and the insulating tape 2 is located on the side of the tantalum core.

[0032] The single-piece specification of the anode block used in the present application is 63V4000μF, which is used as the first anode block 6 and the second anode block 8, and the cover plate 15 is a glass insulator anode cover plate.

[0033] The 63V8000μF high-energy hybrid tantalum capacitor proposed in the present application comprises two anode blocks, three cathode sheets, and six positive and negative insulating layers, and after assembly, the two tantalum wires of the anode block are resistance-welded with the tail end 172 with a larger area of the connecting piece 17 to realize the positive electrode lead-out.

Claims

1. A capacitor using a solder-type square anode cover, characterized by: The application relates to a tantalum capacitor, which comprises a shell (1), a tantalum core, an insulating assembly and a cover plate (15), the tantalum core and the insulating assembly are arranged in the shell (1), the insulating assembly is connected with the tantalum core and the cover plate (15) respectively, a positive electrode lead-out end (16) is arranged on the tantalum core, the cover plate (15) is connected with the insulating assembly and the shell (1) respectively, a connecting piece (17) is arranged on the cover plate (15), the positive electrode lead-out end (16) is connected with the connecting piece (17), and a sleeve (10) is arranged on the positive electrode lead-out end (16). The connecting piece (17) comprises an end part (171) and a tail part (172), and the end part (171) is connected with the positive electrode lead-out end (16) through the tail part (172). The tail part (172) is in a rectangular section.

2. A capacitor using a welded square anode cover plate as recited in claim 1, wherein: A through hole (151) and a connecting hole (152) are arranged on the cover plate (15), and the connecting piece (17) penetrates through the cover plate (15) through the connecting hole (152).

3. A capacitor using a welded square anode cover plate as recited in claim 1, wherein: The tantalum core comprises a first cathode sheet (4), a first anode block (6), a second cathode sheet (7), a second anode block (8) and a third cathode sheet (9) from bottom to top, the first cathode sheet (4) is arranged at the bottom of the shell (1), and the third cathode sheet (9) is connected with the insulating assembly.

4. A capacitor using a welded square anode cover plate as claimed in claim 3, characterized in that: A first insulating layer (3) is arranged between the first cathode sheet (4) and the shell (1), and a second insulating layer (5) is arranged between the first cathode sheet (4) and the first anode block (6), between the first anode block (6) and the second cathode sheet (7), between the second cathode sheet (7) and the second anode block (8), between the second anode block (8) and the third cathode sheet (9), and between the third cathode sheet (9) and the insulating assembly.

5. A capacitor using a welded square anode cover plate as recited in claim 1, wherein: The insulating assembly comprises an insulating gasket (11), an adjusting gasket (12), a gasket (13) and a gasket ring (14) from bottom to top, and the gasket ring (14) is connected with the cover plate (15).

6. A capacitor using a welded square anode cover plate as recited in claim 1, wherein: An insulating belt (2) is arranged on the inner wall of the shell (1).

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