Welding structure of a capacitor top cover

Abstract

The utility model relates to the technical field of capacitor, concretely is the welding structure of capacitor top cover, this capacitor top cover's welding structure includes first positive pole connecting piece and sets up second positive pole connecting piece at first positive pole connecting piece one side, is provided with positive pole post, sealing ring, end cover, positive pole isolation piece and positive pole top cover in proper order at second positive pole connecting piece near first positive pole connecting piece one end, the end cover is annular shape, and is provided with recess on the end cover, and the end cover is clamped between positive pole isolation piece and positive pole top cover, and positive pole isolation piece is embedded in recess, and positive pole post is fixedly sleeved on positive pole isolation piece, and positive pole post is connected with end cover, second positive pole connecting piece is fixedly sleeved on positive pole top cover, and positive pole top cover is in order from right to left and penetrates end cover, positive pole post and positive pole isolation piece. The welding structure of capacitor top cover has realized greater current collection welding area, has guaranteed structure stability, and has shortened the distance of pole piece to current collection welding point.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically to the welding structure of a capacitor top cover. Background Technology

[0002] An electrolytic capacitor is a polarized capacitor that uses an electrolyte as its cathode and an oxide film formed on the surface of the anode metal as its dielectric to achieve large-capacity energy storage. It is widely used in power supply filtering, signal coupling and other applications.

[0003] Traditional electrolytic capacitors have a complex and poorly designed structure. They employ a cold-riveted conductive strip structure, resulting in a long distance from the electrode to the collector solder joint and a small solder joint area. For example, a 450V 1000uf product shows that the traditional electrolytic capacitor has a distance of 1000mm from the electrode to the collector solder joint, with a solder joint area of ​​only about 5mm², leading to poor stability. Therefore, the inventors have improved the structure of the electrolytic capacitor's top cover. Utility Model Content

[0004] The purpose of this utility model is to provide a welding structure for a capacitor top cover. This welding structure for a capacitor top cover has the advantages of simple structure, reasonable design, larger current collector welding point area, guaranteed structural strength, and shortened distance from electrode to current collector welding point, thus solving the problems mentioned in the above technical background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a welding structure for a capacitor top cover, comprising a first positive electrode connecting piece and a second positive electrode connecting piece disposed on one side of the first positive electrode connecting piece. A positive electrode post, a sealing ring, an end cap, a positive electrode insulating piece, and a positive electrode top cover are sequentially disposed at the end of the second positive electrode connecting piece near the first positive electrode connecting piece. The end cap is ring-shaped and has a groove. The end cap is sandwiched between the positive electrode insulating piece and the positive electrode top cover, with the positive electrode insulating piece embedded in the groove. The positive electrode post is fixedly sleeved on the positive electrode insulating piece and is in contact with the end cap. The second positive electrode connecting piece is fixedly sleeved on the positive electrode top cover. The positive electrode top cover passes through the end cap, the positive electrode post, and the positive electrode insulating piece sequentially from right to left, and a first welding edge is provided between the positive electrode top cover and the positive electrode insulating piece.

[0006] Preferably, connecting grooves are formed at both ends of the first positive electrode connecting piece, and multiple welding grooves are provided at the end of the first positive electrode connecting piece near the second positive electrode connecting piece. The multiple welding grooves are distributed in the circumferential direction of the first positive electrode connecting piece. Both ends of the second positive electrode connecting piece are provided with protruding corners, and the two protruding corners are respectively engaged in the two connecting grooves.

[0007] Preferably, the sealing ring is sandwiched between the end cap and the positive electrode top cap, and both ends of the sealing ring are in contact with the end cap and the positive electrode top cap, respectively.

[0008] Preferably, both the sealing ring and the positive electrode separator are annular in shape, and the sealing ring and the positive electrode separator are respectively disposed at both ends of the end cap.

[0009] Preferably, a second welding edge is provided between the second positive electrode connecting piece and the positive electrode top cover, which fits and contacts the sealing ring.

[0010] Preferably, an insulating sheet is provided at the end of the first positive electrode connecting piece away from the end cap, and the first positive electrode connecting piece is in contact with the insulating sheet.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This utility model provides a welding structure for a capacitor top cover. The welding structure includes a first positive electrode connecting piece and a second positive electrode connecting piece disposed on one side of the first positive electrode connecting piece. The overall structure is simple and reasonably designed. The end of the second positive electrode connecting piece near the first positive electrode connecting piece is sequentially provided with a positive electrode post, a sealing ring, an end cap, a positive electrode insulating piece, and a positive electrode top cover. The positive electrode post and the positive electrode top cover are connected by continuous laser peripheral welding. The first positive electrode connecting piece and the second positive electrode connecting piece are connected by pulsed laser penetration welding. The second positive electrode connecting piece and the positive electrode top cover are connected by laser peripheral welding. The end cap and the outer shell are connected by continuous laser peripheral welding. This achieves a larger current collector welding area, ensures structural stability, and shortens the distance from the electrode to the current collector welding point. The method of full-tab cross-section welding solves the problems of small current collector welding point area and long distance from the electrode to the current collector welding point in the prior art. Attached Figure Description

[0013] Figure 1 This is an exploded view of the present invention;

[0014] Figure 2 This is an exploded view of the positive electrode post, sealing ring, end cap, positive electrode separator, and positive electrode top cap of this utility model;

[0015] Figure 3 This is one of the schematic diagrams showing the positive electrode post, sealing ring, end cap, positive electrode separator, and positive electrode top cap assembled according to this utility model;

[0016] Figure 4 This is the second schematic diagram showing the assembled positive electrode post, sealing ring, end cap, positive electrode separator, and positive electrode top cap of this utility model.

[0017] Figure 5 This is a schematic diagram of the second positive electrode connecting piece and the positive electrode top cover after assembly.

[0018] Figure 6 This is a schematic diagram of the first positive electrode connecting piece of this utility model;

[0019] Figure 7 This is a schematic diagram of the first positive electrode connecting piece and the second positive electrode connecting piece after assembly.

[0020] Figure 8 This is a schematic diagram of the present invention before assembly with the outer shell;

[0021] Figure 9 This is a schematic diagram of the present invention after assembly with the outer shell.

[0022] The reference numerals and names in the figure are as follows: 1. First positive electrode connecting piece; 101. Connecting groove; 102. Welding groove; 2. Second positive electrode connecting piece; 201. Protruding angle; 3. Positive electrode post; 4. Sealing ring; 5. End cap; 501. Groove; 6. Positive electrode insulating piece; 7. Positive electrode top cap; 8. Insulating piece; 9. First welding edge; 10. Second welding edge; 11. Outer shell; 12. Third welding edge. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0026] Please see Figure 1 The present invention provides an embodiment of a welded structure for a capacitor top cover. This welded structure covers electrolytic capacitors with diameters ranging from 15mm to 100mm and heights from 20mm to 200mm. In this embodiment, a 1400 microfarad / 400 volt electrolytic capacitor, model 35650, is used. The components are connected through assembly and laser welding. Testing was conducted at room temperature (9℃). At a ripple current of 20A, the temperature rise was 11.5℃, and at a ripple current of 30A, the temperature rise was 25℃. With a resistance of only 8mΩ, the welding structure of the capacitor top cover includes a first positive electrode connecting piece 1 and a second positive electrode connecting piece 2 disposed on one side of the first positive electrode connecting piece 1. At the end of the second positive electrode connecting piece 2 near the first positive electrode connecting piece 1, a positive electrode post 3, a sealing ring 4, an end cap 5, a positive electrode insulating piece 6, and a positive electrode top cap 7 are arranged in sequence. The end cap 5 is ring-shaped and is sandwiched between the positive electrode insulating piece 6 and the positive electrode top cap 7. The first positive electrode connecting piece 1 and the wound electrode positive electrode are welded by a full-tab cross-section through-pulse laser welding.

[0027] Please see Figure 2 The end cap 5 has a groove 501, and the positive electrode separator 6 is embedded in the groove 501. The sealing ring 4 and the positive electrode separator 6 are both annular in shape, and the sealing ring 4 and the positive electrode separator 6 are respectively located at both ends of the end cap 5.

[0028] Please see Figures 3 to 4 The positive electrode post 3 is fixedly sleeved on the positive electrode separator 6, and the positive electrode post 3 is in contact with the end cap 5. The sealing ring 4 is sandwiched between the end cap 5 and the positive electrode top cover 7, and the two ends of the sealing ring 4 are in contact with the end cap 5 and the positive electrode top cover 7 respectively. The positive electrode top cover 7 passes through the end cap 5, the positive electrode post 3 and the positive electrode separator 6 from right to left, and a first welding edge 9 is provided between the positive electrode top cover 7 and the positive electrode separator 6. The positive electrode post 3 and the positive electrode top cover 7 are connected by continuous laser peripheral welding with a welding depth of 0.8 nm and a welding width of 1.2 mm.

[0029] Please see Figure 5Both ends of the second positive electrode connecting piece 2 are provided with protruding angles 201, and the second positive electrode connecting piece 2 is fixedly sleeved on the positive electrode top cover 7. A second welding edge 10 is provided between the second positive electrode connecting piece 2 and the positive electrode top cover 7, and the second positive electrode connecting piece 2 is in contact with the sealing ring 4. The second positive electrode connecting piece 2 and the positive electrode top cover 7 are connected by laser peripheral welding, with a welding depth of 0.8 mm and a welding width of 1.2 mm.

[0030] Please see Figure 6 Connecting grooves 101 are formed at both ends of the first positive electrode connecting piece 1, and multiple welding grooves 102 are provided at the end of the first positive electrode connecting piece 1 near the second positive electrode connecting piece 2. The multiple welding grooves 102 are distributed in the circumferential direction of the first positive electrode connecting piece 1.

[0031] Please see Figures 6 to 7 Two protruding corners 201 are respectively engaged in two connecting grooves 101. In this embodiment, six welding grooves 102 are provided. Multiple welding grooves 102 are located at one end of the first positive electrode connecting piece 1 near the second positive electrode connecting piece 2. The first positive electrode connecting piece 1 and the second positive electrode connecting piece 2 are connected by pulsed laser penetration welding. The penetration depth of the positive electrode is 2mm.

[0032] Please see Figure 8 An insulating sheet 8 is provided at the end of the first positive electrode connecting piece 1 away from the end cover 5, and the first positive electrode connecting piece 1 is in contact with the insulating sheet 8, which serves as a protective element.

[0033] Please see Figure 9 During assembly, the first positive electrode connecting piece 1, the second positive electrode connecting piece 2, the positive electrode post 3, the sealing ring 4, the end cap 5, the positive electrode insulating piece 6, the positive electrode top cap 7, and the insulating piece 8 are assembled and installed inside the housing 11. The housing 11 is a hollow cavity structure with openings at both ends. The above-mentioned assembly is located at the opening position on one side of the cavity of the housing 11. After installation, the positive electrode top cap 7 is exposed on the outside of the housing 11. In addition, a third welding edge 12 is provided between the end cap 5 and the housing 11. The end cap 5 and the housing 11 are continuously laser peripherally welded with a weld depth of 0.8 mm and a weld width of 1.2 mm. Finally, the insulating piece 8 is attached to the cap and fixed in the cavity of the housing 11. By using the full-tab cross-section welding method, the problems of small current collector welding point area and long distance from electrode to current collector welding point in the prior art are solved.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. The welding structure of the capacitor top cover, characterized in that: The device includes a first positive electrode connecting piece (1) and a second positive electrode connecting piece (2) disposed on one side of the first positive electrode connecting piece (1). The second positive electrode connecting piece (2) near the end of the first positive electrode connecting piece (1) is sequentially provided with a positive electrode post (3), a sealing ring (4), an end cap (5), a positive electrode separator (6), and a positive electrode top cap (7). The end cap (5) is annular in shape and has a groove (501). The end cap (5) is sandwiched between the positive electrode separator (6) and the positive electrode top cap (7). Between the positive electrode separator (6), the positive electrode separator (6) is embedded in the groove (501), the positive electrode post (3) is fixedly sleeved on the positive electrode separator (6), and the positive electrode post (3) is in contact with the end cap (5). The second positive electrode connecting piece (2) is fixedly sleeved on the positive electrode top cover (7). The positive electrode top cover (7) passes through the end cap (5), the positive electrode post (3) and the positive electrode separator (6) from right to left, and a first welding edge (9) is provided between the positive electrode top cover (7) and the positive electrode separator (6).

2. The welding structure of the capacitor top cover according to claim 1, characterized in that: Both ends of the first positive electrode connecting piece (1) are formed with connecting grooves (101), and the end of the first positive electrode connecting piece (1) near the second positive electrode connecting piece (2) is provided with a plurality of welding grooves (102). The plurality of welding grooves (102) are distributed in the circumferential direction of the first positive electrode connecting piece (1). Both ends of the second positive electrode connecting piece (2) are provided with protruding corners (201), and the two protruding corners (201) are respectively engaged in the two connecting grooves (101).

3. The welding structure of the capacitor top cover according to claim 1, characterized in that: The sealing ring (4) is sandwiched between the end cap (5) and the positive electrode top cap (7), and the two ends of the sealing ring (4) are respectively in contact with the end cap (5) and the positive electrode top cap (7).

4. The welding structure of the capacitor top cover according to claim 1, characterized in that: The sealing ring (4) and the positive electrode separator (6) are both ring-shaped, and the sealing ring (4) and the positive electrode separator (6) are respectively disposed at both ends of the end cap (5).

5. The welding structure of the capacitor top cover according to claim 1, characterized in that: A second welding edge (10) is provided between the second positive electrode connecting piece (2) and the positive electrode top cover (7), and the second positive electrode connecting piece (2) is in contact with the sealing ring (4).

6. The welding structure of the capacitor top cover according to claim 1, characterized in that: An insulating sheet (8) is provided at the end of the first positive electrode connecting piece (1) away from the end cap (5), and the first positive electrode connecting piece (1) is in contact with the insulating sheet (8).

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