Welding structure of a capacitor bottom cover

Abstract

The utility model relates to the technical field of capacitor, concretely is the welding structure of capacitor bottom cover, this capacitor bottom cover's welding structure includes negative pole current collector piece, negative pole bottom cover, seal seal ring and seal seal cover that set gradually from left to right, negative pole current collector piece is away from the one end of negative pole bottom cover and is provided with winding electrode negative pole, and negative pole current collector piece and winding electrode negative pole weld fixed, the one end close to negative pole bottom cover of negative pole current collector piece is fixed with negative pole current collector column, negative pole bottom cover welds in the one end of negative pole current collector column away from negative pole current collector piece, the one end away from negative pole current collector piece of negative pole bottom cover is provided with seal seal ring and the seal seal cover on seal seal ring, seal seal ring penetrates negative pole bottom cover and negative pole current collector column and is fixed on winding electrode negative pole. The welding structure of capacitor bottom cover strengthens the structural strength of capacitor negative pole, thereby reduces capacitor internal resistance, improves ripple current carrying capacity, increases the life of capacitor.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically to the welding structure of a capacitor bottom 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] The structure of the negative electrode of existing electrolytic capacitors is relatively complex and poorly designed. Traditional electrolytic capacitors use a cold-riveted structure for the conductive strips, resulting in a long distance from the electrode to the current collector solder joint and a small solder joint area. For example, comparing a 450V 1000uf product, the distance from the electrode to the current collector solder joint in a traditional electrolytic capacitor structure is approximately 1000mm, and the solder joint area is only about 5mm². Furthermore, due to the limitations of the current collector structure, key performance indicators such as internal resistance / ripple current carrying capacity and lifespan of traditional electrolytic capacitors need improvement. Therefore, the inventors have improved the structure of the negative electrode of electrolytic capacitors. Utility Model Content

[0004] The purpose of this utility model is to provide a welding structure for a capacitor bottom cover. This welding structure for the capacitor bottom cover has the advantages of simple structure, reasonable design, and strengthening of the structural strength of the capacitor negative electrode by welding the end face of the full-tab, thereby reducing the internal resistance of the capacitor, improving the ripple current carrying capacity, and increasing the life of the capacitor, 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 welded structure for a capacitor bottom cover, comprising, from left to right, a negative electrode current collector, a negative electrode bottom cover, a sealing ring, and a sealing cap. A wound electrode negative terminal is located at the end of the negative electrode current collector away from the negative electrode bottom cover, and the negative electrode current collector is welded and fixed to the wound electrode negative terminal. A negative electrode current collector column is fixed at the end of the negative electrode current collector near the negative electrode bottom cover. The negative electrode bottom cover is welded to the end of the negative electrode current collector column away from the negative electrode current collector. A sealing ring and a sealing cap located on the sealing ring are located at the end of the negative electrode bottom cover away from the negative electrode current collector. The sealing ring penetrates the negative electrode bottom cover and the negative electrode current collector column and is fixed to the wound electrode negative terminal. The sealing ring is coaxially arranged with the wound electrode negative terminal. The sealing cap penetrates the sealing ring from the inside out and is inserted into the sealing ring to achieve sealing of the wound electrode negative terminal.

[0006] Preferably, a plurality of current-penetrating welding grooves are provided at one end of the negative current collector near the negative current base, and the plurality of current-penetrating welding grooves are provided in the circumferential direction of the negative current collector.

[0007] Preferably, the multiple current penetration welding grooves are all in a straight line shape, and the multiple current penetration welding grooves are all distributed on the outside of the negative electrode current collector column.

[0008] Preferably, the negative electrode bottom cover is disc-shaped, and a through hole is provided through the axis of the negative electrode bottom cover, which is used to allow the sealing ring to pass through.

[0009] Preferably, a peripheral welding area is provided on the negative electrode bottom cover, and the peripheral welding area is distributed in the circumferential direction of the negative electrode bottom cover.

[0010] Preferably, the sealing ring is ring-shaped, and the end of the sealing cap away from the sealing ring is set on the negative electrode bottom cover. The sealing cap is set in the through hole on the negative electrode bottom cover. When the sealing cap is inserted into the sealing ring, the end away from the sealing ring is just set in the through hole on the negative electrode bottom cover and seals the through hole on the negative electrode bottom cover.

[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 bottom cover. The welding structure includes, from left to right, a negative electrode current collector, a negative electrode bottom cover, a sealing ring, and a sealing cap. The overall structure is simple and rationally designed. A wound electrode negative terminal is located at the end of the negative electrode current collector furthest from the negative electrode bottom cover, and the negative electrode current collector is welded and fixed to the wound electrode negative terminal. A negative electrode current collector post is fixed at the end of the negative electrode current collector near the negative electrode bottom cover, and the negative electrode bottom cover is welded to the end of the negative electrode current collector post furthest from the negative electrode current collector. A sealing ring and a sealing cap are provided at the end of the bottom cover away from the negative electrode current collector. The sealing ring passes through the bottom cover and the negative electrode current collector and is fixed to the negative electrode of the wound electrode. The sealing cap passes through the sealing ring from the inside to the outside and is inserted into the sealing ring to achieve a seal on the negative electrode of the wound electrode. The structural strength of the negative electrode of the capacitor is strengthened by welding the end face of the full electrode tab, thereby reducing the internal resistance of the capacitor, improving the ripple current carrying capacity, and increasing the life of the capacitor. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the negative electrode current collector of this utility model.

[0015] Figure 3 This is a schematic diagram of the negative current collector and the wound negative electrode assembly of this utility model.

[0016] Figure 4 This is a schematic diagram of the negative electrode bottom cover and the negative electrode current collector after assembly.

[0017] Figure 5 This is a schematic diagram of the sealing ring and the negative electrode of the winding electrode after assembly.

[0018] Figure 6 This is a schematic diagram of the sealing cap and sealing ring of this utility model after assembly.

[0019] The reference numerals and names in the figure are as follows: 1. Negative electrode current collector; 101. Electrode current penetration welding groove; 2. Negative electrode bottom cover; 201. Peripheral welding area; 3. Sealing ring; 4. Sealing cover; 5. Winded negative electrode; 6. Negative electrode current collector column; 7. Outer shell. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Please see Figure 1 The present invention provides an embodiment of a capacitor bottom cover welding structure, which includes a negative electrode current collector 1, a negative electrode bottom cover 2, a sealing ring 3, and a sealing cap 4 arranged sequentially from left to right. A wound negative electrode 5 is provided at the end of the negative electrode current collector 1 away from the negative electrode bottom cover 2. The negative electrode bottom cover 2 is disc-shaped, and a through hole is provided along its axis for the sealing ring 3 to pass through. A peripheral welding area 201 is provided on the negative electrode bottom cover 2, and the peripheral welding area 201 is distributed on the negative electrode bottom cover 2. In the circumferential direction of the bottom cover 2, a sealing ring 3 and a sealing cap 4 located on the sealing ring 3 are provided at the end of the bottom cover 2 away from the negative electrode current collector 1. The sealing ring 3 is ring-shaped. In this embodiment, the distance from the electrode to the current collector welding point is about 50mm and the area of ​​the current collector welding point is about 76mm². This strengthens the structural strength of the negative electrode of the capacitor, thereby reducing the internal resistance of the capacitor, improving the ripple current carrying capacity, and increasing the life of the capacitor. For the specific welding method, please refer to the following text.

[0024] Please see Figure 2 A negative electrode current collector column 6 is fixed at one end of the negative electrode current collector 1 near the negative electrode bottom cover 2, and multiple current penetration welding grooves 101 are provided at the end of the negative electrode current collector 1 near the negative electrode bottom cover 2. The multiple current penetration welding grooves 101 are located in the circumferential direction of the negative electrode current collector 1, and the multiple current penetration welding grooves 101 are all in a straight line shape. The multiple current penetration welding grooves 101 are all distributed on the outside of the negative electrode current collector column 6. The negative electrode current collector 1 and the wound electrode negative electrode 5 are connected by pulsed laser penetration welding at the positions of the multiple current penetration welding grooves 101. The penetration depth of the electrode negative electrode is 2mm.

[0025] Please see Figure 3 The negative current collector 1 is welded and fixed to the wound electrode negative electrode 5.

[0026] Please see Figure 4 ,exist Figure 3 Based on the overall structure, the negative electrode bottom cover 2 is welded to the end of the negative electrode current collector 6 away from the negative electrode current collector plate 1. The negative electrode bottom cover 2 and the negative electrode current collector 6 are connected by continuous laser peripheral welding with a welding depth of 0.8 mm and a welding width of 1.2 mm. The negative electrode current collector 6 is ring-shaped, so it has an opening for liquid injection.

[0027] Please see Figure 5 ,exist Figure 4 Based on the overall structure, liquid, which is glue, is then injected through the opening on the negative electrode current collector 6. Then, the sealing ring 3 is installed. The sealing ring 3 passes through the negative electrode bottom cover 2 and the negative electrode current collector 6 and is fixed on the wound electrode negative electrode 5. The sealing ring 3 is coaxial with the wound electrode negative electrode 5.

[0028] Please see Figure 6 ,exist Figure 5 Based on the overall structure, the sealing cap 4 penetrates the sealing ring 3 from the inside out and is inserted into the sealing ring 3 to seal the negative electrode 5 of the wound electrode. The end of the sealing cap 4 away from the sealing ring 3 is set on the negative electrode bottom cover 2. Specifically, the sealing cap 4 is set in the through hole on the negative electrode bottom cover 2. When the sealing cap 4 is inserted into the sealing ring 3, the end away from the sealing ring 3 is just set in the through hole on the negative electrode bottom cover 2 and seals the through hole on the negative electrode bottom cover 2. In this embodiment, both the sealing ring 3 and the sealing cap 4 are made of rubber.

[0029] Please refer to it again. Figure 6 During assembly, the negative current collector 1, negative bottom cover 2, sealing ring 3, sealing cap 4, wound electrode negative electrode 5, and negative current collector column 6 are all assembled inside the outer shell 7. The outer shell 7 is a hollow cavity structure with openings at both ends. The wound electrode negative electrode 5 is assembled at the center of the cavity of the outer shell 7. The positive and negative electrodes of the capacitor are located at the two ends of the wound electrode negative electrode 5, respectively. After the negative current collector 1 and the wound electrode negative electrode 5 are fixed, and the negative bottom cover 2 and the negative current collector column 6 are fixed, continuous laser peripheral welding is performed between the above-mentioned components and the outer shell 7 at the peripheral welding area 201. The welding depth is 0.8 mm and the welding width is 1.2 mm, thereby fixing the negative current collector 1, the negative bottom cover 2, and the wound electrode negative electrode 5 inside the cavity of the outer shell 7. This embodiment covers electrolytic capacitors with diameter values ​​between 15 mm and 100 mm and height values ​​between 20 mm and 200 mm.

[0030] 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 bottom cover, characterized in that: The device includes, from left to right, a negative electrode current collector (1), a negative electrode bottom cover (2), a sealing ring (3), and a sealing cap (4). A wound electrode negative electrode (5) is located at the end of the negative electrode current collector (1) furthest from the negative electrode bottom cover (2), and the negative electrode current collector (1) is welded and fixed to the wound electrode negative electrode (5). A negative electrode current collector column (6) is fixed at the end of the negative electrode current collector (1) closest to the negative electrode bottom cover (2), and the negative electrode bottom cover (2) is welded to the end of the negative electrode current collector column (6) furthest from the negative electrode current collector (1). The bottom cover (2) is provided with a sealing ring (3) and a sealing cap (4) on the sealing ring (3) at the end away from the negative electrode current collector (1). The sealing ring (3) passes through the bottom cover (2) and the negative electrode current collector (6) and is fixed on the wound electrode negative electrode (5). The sealing ring (3) is coaxial with the wound electrode negative electrode (5). The sealing cap (4) passes through the sealing ring (3) from the inside to the outside and is inserted into the sealing ring (3) to achieve sealing of the wound electrode negative electrode (5).

2. The welding structure of the capacitor bottom cover according to claim 1, characterized in that: The negative electrode current collector (1) is provided with a plurality of current penetration welding grooves (101) at one end near the negative electrode bottom cover (2), and the plurality of current penetration welding grooves (101) are arranged in the circumferential direction of the negative electrode current collector (1).

3. The welding structure of the capacitor bottom cover according to claim 2, characterized in that: The multiple polar current penetration welding grooves (101) are all in a straight line shape, and the multiple polar current penetration welding grooves (101) are all distributed on the outside of the negative electrode current collector column (6).

4. The welding structure of the capacitor bottom cover according to claim 1, characterized in that: The negative electrode bottom cover (2) is disc-shaped, and a through hole is provided through the axis of the negative electrode bottom cover (2).

5. The welding structure of the capacitor bottom cover according to claim 1, characterized in that: The negative electrode bottom cover (2) is provided with a peripheral welding area (201), which is distributed in the circumferential direction of the negative electrode bottom cover (2).

6. The welding structure of the capacitor bottom cover according to claim 1, characterized in that: The sealing ring (3) is ring-shaped, and the end of the sealing cap (4) away from the sealing ring (3) is set on the negative electrode bottom cap (2).

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