A tabbed aluminum electrolytic capacitor

Abstract

This utility model provides a welded aluminum electrolytic capacitor, relating to the field of capacitor technology, and solves the technical problems of high resistance, high heat generation, easy oxidation, and large size in mechanical riveting structures of conductive foil strips and aluminum rivets. The welded aluminum electrolytic capacitor includes a core, conductive foil strips, a cover plate, and aluminum rivets; one end of the conductive foil strip is connected to the core, and the other end is exposed on the core surface; the aluminum rivets pass through the cover plate; the cover plate presses onto the top of the core; the conductive foil strip and the aluminum rivets are connected together by laser riveting. This utility model uses laser riveting technology to weld the core conductive foil strip and the lead-out end cover plate aluminum rivets together, improving welding firmness, increasing welding strength, reducing heat generation, improving conductivity, increasing the ability to withstand large ripple currents, and enhancing the ability to withstand large ripple currents.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a high-reliability aluminum electrolytic capacitor with solder pads. Background Technology

[0002] As a common component in electronic circuits, capacitors play electrical roles such as filtering, bypassing, coupling, decoupling, and phase shifting. Filtering is the most typical function of large self-standing aluminum electrolytic capacitors. The core component is the capacitor's internal casing, mainly composed of positive and negative plates (anode foil and cathode foil), insulating electrolytic paper, electrolyte, and connecting conductive strips (leads). These conductive strips are then riveted to the cover plate and lead terminals (including aluminum rivets and solder tabs). After the cover plate and aluminum shell are sealed, a series of processes are used to manufacture a qualified aluminum electrolytic capacitor.

[0003] The reliability of large self-standing aluminum electrolytic capacitors is directly related to the capacitor material and usage conditions, as well as the manufacturing process. Among these factors, the sealing of electrolytic capacitors is relatively easy to achieve. Therefore, the most difficult factor to control in terms of manufacturing process is the reliability of the welding between the conductor foil and the aluminum rivets on the cover plate.

[0004] Currently, the connection between the conductive foil strip and the cover plate aluminum rivet in self-standing large aluminum electrolytic capacitors (sometimes called solder-type aluminum electrolytic capacitors, and sometimes still using the traditional name "horn capacitor") is generally achieved by drilling a hole at one end of the conductive foil strip with the exposed core, inserting the cylindrical cover plate aluminum rivet into this hole, and then fitting a washer (aluminum gasket) onto the cylinder. Mechanically, the exposed cylinder of the aluminum rivet is flattened, and the conductive foil strip and the cover plate aluminum rivet can then serve as a current channel.

[0005] The applicant has discovered at least the following technical problems in the prior art: 1) No matter how much pressure is applied between the conductor foil and the aluminum rivet, there will always be a certain gap, which affects the riveting resistance and conductivity. During use, the higher the resistance, the more intense the heating. 2) Due to the presence of electrolyte, oxidation will occur between the conductor foil and the aluminum rivet during use, which can easily lead to open circuits and loss of conductivity. 3) Due to the use of aluminum rivets and conductor foil washer fixing methods, the gap between the capacitor core and the cover plate is relatively large, and the aluminum rivet is inserted relatively deeply into the end face of the core, which affects the overall size of the capacitor to be too high. Utility Model Content

[0006] The purpose of this invention is to provide a high-reliability aluminum electrolytic capacitor with solder pads to solve the aforementioned technical problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides a soldered aluminum electrolytic capacitor, comprising a core, conductive foil strips, a cover plate, and aluminum rivets; wherein: One end of the guide foil is connected to the core, and the other end is exposed on the surface of the core; The aluminum rivets are inserted through the cover plate; The cover plate presses over the top of the core; The guide foil and the aluminum rivet are connected together by laser riveting.

[0008] This utility model discloses a welded aluminum electrolytic capacitor, a high-reliability, high-ripple-resistance, self-supporting large aluminum electrolytic capacitor. The core conductive foil strip and the aluminum rivets on the lead-out end cover are welded together using a laser riveting process, improving weld strength and robustness. Laser welding reduces the resistance at the weld joint between the conductive foil strip and the aluminum rivets (from 0.4mΩ to less than 0.2mΩ), reducing heat generation, improving conductivity, and increasing the capacity to withstand high ripple currents. Simultaneously, the riveting joint is seamless, ensuring a strong weld and preventing open circuits caused by oxidation at the electrical gap, thus extending service life. Because the aluminum rivets and conductive foil strips are end-face welded, the cover plate... The internal aluminum rivets do not extend beyond the guide foil strip to contact the core end face. Therefore, the aluminum rivets no longer contact the core end face; instead, the contact with the core end face is replaced by the welding surface of the guide foil strip. This changes the original aluminum rivet contact to the guide foil strip welding surface contact, and the contact area from point contact to surface contact. The larger contact area, with all parts tightly pressed against the upper end face of the core, results in less damage to the core end face and better fixing effect. This is especially advantageous when used in high vibration environments. The shortened length of the internal aluminum rivets in the cover plate allows for a reduction in the overall height of the capacitor (approximately 1.5mm), or an increase in the height of the internal core (approximately 1.5mm), thereby improving the capacitor's capacity or performance and enhancing its ripple current handling capability.

[0009] As a further improvement of this utility model, the height of the aluminum rivet after passing through the cover plate is 1.5-2.5mm.

[0010] Since the aluminum rivets do not need to pass through the guide foil strip, but only need to be welded to the surface of the guide foil strip, the length of the aluminum rivets inside the cover plate is shortened. The length of the aluminum rivets in a conventional cover plate is generally about 4.6mm, while the length of the aluminum rivets under the cover plate in this utility model is about 1.5 to 2.5mm. Except for the need to use aluminum washers to fix the lower end of the cover plate, there is basically no need for excess aluminum rivets to protrude. The overall height of the capacitor can be appropriately reduced (about 1.5mm), and the product can be further miniaturized. Alternatively, the height of the internal core can be increased (about 1.5mm) to improve the capacitor capacity or performance, thereby providing the capacitor with ripple current carrying capacity.

[0011] As a further improvement of this utility model, it also includes an aluminum washer, which is sleeved on the aluminum rivet.

[0012] Aluminum rivets are secured using aluminum washers.

[0013] As a further improvement of this utility model, when the cover plate is pressed onto the top of the core, the guide foil strip and the welding position of the aluminum rivet abut against the surface of the core.

[0014] As a further improvement of this utility model, the area of ​​the compression region where the guide foil abuts against the surface of the core is not less than 25mm². 2 .

[0015] The aluminum rivets inside the cover plate are welded with guide foil strips, which have a larger area (from the original 7mm). 2 Increased to 25mm (approximately). 2 All of the above are pressed tightly onto the upper end face of the core, resulting in less damage to the core end face, better fixing effect, and improved safety and reliability of the capacitor. This is especially advantageous when used in high vibration environments (such as vehicles, power tools, etc.).

[0016] As a further improvement of this utility model, the cover plate is provided with a positive lead-out terminal and a negative lead-out terminal on the side opposite to the core; there are two aluminum rivets, which pass through the positive lead-out terminal and the negative lead-out terminal respectively, and then pass through the cover plate to connect with the guide foil strip.

[0017] As a further improvement of this utility model, it also includes an aluminum shell, with the core placed inside the aluminum shell; the cover plate is fixed to the top of the aluminum shell.

[0018] As a further improvement of this utility model, it also includes a sleeve, which is sleeved on the outside of the aluminum shell.

[0019] As a further improvement of this utility model, the core is provided with an anode foil and a cathode foil, and there are two conductive foil strips, which are respectively connected to the anode foil and the cathode foil.

[0020] As a further improvement of this utility model, the diameter of the capacitor is Φ22~Φ45mm.

[0021] Large aluminum electrolytic capacitors with self-standing substrates manufactured using laser riveting welding of the cover plate are produced in the same manner as conventional methods. They are applicable to a full range of product sizes from Φ22 to Φ45 in diameter. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the aluminum electrolytic capacitor with welded core when the conductive foil strip on the core is welded together with the aluminum rivets on the cover plate. Figure 2 This is a front cross-sectional view of the aluminum electrolytic capacitor with solder pads according to this utility model; Figure 3 This is a three-dimensional structural diagram of the aluminum rivets and conductive foil strips welded together in the aluminum electrolytic capacitor of this utility model. Figure 4 This is a partial structural diagram of the aluminum rivets and conductive foil strips welded together in the aluminum electrolytic capacitor of this utility model.

[0024] In the diagram: 1. Core; 2. Aluminum shell; 3. Cover plate; 4. Sleeve; 5. Electrolytic paper; 6. Cathode foil; 7. Anode foil; 8. Positive lead-out terminal; 9. Negative lead-out terminal; 10. Aluminum rivet; 11. Conductor foil strip; 12. Laser welding joint; 13. Laser riveting joint and core extrusion surface; 14. Aluminum gasket. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figures 1-4 As shown, this utility model provides a soldered aluminum electrolytic capacitor, including a core 1, a conductive foil strip 11, a cover plate 3, and aluminum rivets 10; wherein: One end of the guide foil 11 is connected to the core 1, and the other end is exposed on the surface of the core 1; Aluminum rivets 10 are inserted into cover plate 3; The cover plate 3 presses onto the top of the core 1; The guide foil strip 11 and the aluminum rivet 10 are connected together by laser riveting.

[0027] This utility model discloses a welded aluminum electrolytic capacitor, a high-reliability, high-ripple-resistance, self-supporting large aluminum electrolytic capacitor. The core 1, conductive foil strip 11, and the lead-out end cover plate 3 aluminum rivets 10 are welded together using laser riveting technology, improving weld strength and stability. Laser welding reduces the resistance at the weld between the conductive foil strip 11 and the lead-out end cover plate 3 aluminum rivets 10 (from 0.4mΩ to less than 0.2mΩ), reducing heat generation, improving conductivity, increasing the capacity to withstand high ripple current, and enhancing the ability to withstand high ripple current. Simultaneously, the riveting joint is seamless, ensuring a strong weld and preventing open circuits caused by oxidation at the electrical gap, thus extending service life. Because the aluminum rivets 10 and the conductive foil strip 11 have an end-face welded structure, the aluminum inside the cover plate 3... The rivet 10 will not extend out of the guide foil 11 to contact the end face of the core 1. Therefore, the aluminum rivet 10 no longer contacts the end face of the core 1. Instead, the contact with the end face of the core 1 is changed to the welding surface of the guide foil 11. The original contact of the aluminum rivet 10 is changed to the contact of the welding surface of the guide foil 11, and the contact is changed from point contact to surface contact. The contact area is large, and the entire surface is pressed tightly against the upper end face of the core 1, resulting in less damage to the end face of the core 1 and better fixing effect. This is especially advantageous when used in high vibration environments. The length of the aluminum rivet 10 inside the cover plate 3 is shortened, so the overall height of the capacitor can be appropriately reduced (about 1.5mm), or the height of the internal core 1 can be increased (about 1.5mm) to improve the capacitor capacity or performance, thereby providing the capacitor with ripple current carrying capacity.

[0028] As a further improvement of this utility model, the height of the aluminum rivet 10 after passing through the cover plate 3 is 1.5-2.5mm.

[0029] Since the aluminum rivet 10 does not need to pass through the guide foil strip 11, and only needs to be welded to the surface of the guide foil strip 11 at its end face, the length of the aluminum rivet 10 inside the cover plate 3 is shortened. The length of the aluminum rivet in the conventional cover plate 3 is generally about 4.6mm, while the length of the aluminum rivet under the cover plate 3 in this utility model is about 1.5 to 2.5mm. Except for the need to use an aluminum washer to fix the lower end of the cover plate 3, there is basically no need for extra aluminum rivets to protrude. The overall height of the capacitor can be appropriately reduced (about 1.5mm), and the product can be further miniaturized. Alternatively, the height of the internal core 1 can be increased (about 1.5mm) to improve the capacitor capacity or performance, thereby providing the capacitor with ripple current carrying capacity.

[0030] As a further improvement of this utility model, it also includes an aluminum washer, which is sleeved on the aluminum rivet 10.

[0031] The aluminum rivet 10 is secured by an aluminum washer.

[0032] As a further improvement of this utility model, when the cover plate 3 is pressed on the top of the core 1, the welding position of the guide foil strip and the aluminum rivet 10 abuts against the surface of the core 1. Specifically, the guide foil strip 11 contacts the aluminum rivet 10 of the cover plate 3 and is directly welded together by laser. Therefore, the aluminum rivet 10 does not protrude from the guide foil strip 11. In conventional processes, the aluminum rivet 10 passes through the guide foil strip 11 and contacts the end face of the capacitor core 1. The area of ​​the aluminum rivet 10 is relatively small. In this utility model, the aluminum rivet 10 and the guide foil strip 11 are directly welded together. The aluminum rivet 10 does not contact the core 1, but the guide foil strip 11 contacts the core 1. The area of ​​the guide foil strip 11 is larger, changing from point contact to surface contact.

[0033] As a further improvement of this utility model, the area of ​​the extrusion zone where the guide foil abuts against the surface of the core 1 is not less than 25mm². 2 .

[0034] The cover plate 3 has aluminum rivets 10 inside, and a guide foil strip 11 is welded to its surface, with a larger area (from the original 7mm). 2 Increased to 25mm (approximately). 2 All of the above are pressed tightly onto the upper surface of core 1, resulting in less damage to the end face of core 1, better fixing effect, and improved safety and reliability of the capacitor. This is especially advantageous when used in high vibration environments (such as vehicles, power tools, etc.).

[0035] As a further improvement of this utility model, the cover plate 3 is provided with a positive lead-out terminal 9 and a negative lead-out terminal 9 on the side opposite to the core 1; there are two aluminum rivets 10, which pass through the positive lead-out terminal 8 and the negative lead-out terminal 9 respectively and then pass through the cover plate 3 to connect with the guide foil strip 11.

[0036] As a further improvement of this utility model, it also includes an aluminum shell 2, with the core 1 placed inside the aluminum shell 2; and a cover plate 3 fixed to the top of the aluminum shell 2.

[0037] As a further improvement of this utility model, it also includes a sleeve 4, which is sleeved on the outside of the aluminum shell 2.

[0038] As a further improvement of this utility model, the core 1 is provided with an anode foil 7 and a cathode foil 6, and there are two guide foil strips 11, which are respectively connected to the anode foil 7 and the cathode foil 6.

[0039] As a further improvement of this utility model, the capacitor diameter is Φ22~Φ45mm.

[0040] The self-standing substrate large aluminum electrolytic capacitor is manufactured by laser riveting welding cover plate 3. All other processes and manufacturing processes are the same as conventional methods. It is applicable to a full range of product sizes from Φ22 to Φ45.

[0041] Example 1: like Figures 1-4 As shown, in this embodiment, the aluminum electrolytic capacitor with solder pads mainly consists of the following parts: core 1, aluminum shell 2, cover plate 3, sleeve 4, etc.

[0042] The core 1 includes electrolytic paper 5, cathode foil 6, anode foil 7, and conductive foil strip 11; the cover plate 3 is provided with positive electrode lead-out terminal 8, negative electrode lead-out terminal 9, aluminum rivet 10, etc.

[0043] like Figure 1 As shown, the welding position between the guide foil strip and the aluminum rivet is laser welding point 12; the diameter of laser welding point 12 is the same as or larger than the aluminum rivet specification; as shown... Figure 2 As shown, after the cover plate is installed, the contact surface between the guide foil strip and the core 1 is the laser riveting point and the core extrusion surface 13. The specifications of the laser riveting point and the core extrusion surface 13 are larger than those of the aluminum rivet 10, resulting in a larger contact surface with the core and a more obvious fixing effect.

[0044] The cover plate 3 used in this utility model differs from the conventional cover plate in the length of the riveted aluminum rivets 10 (located at the bottom of the cover plate, which are sealed inside the capacitor after being made into a capacitor). The length of the aluminum rivets in the conventional cover plate is generally about 4.6 mm, while the length of the aluminum rivets under the cover plate used in this utility model is about 1.5 to 2.5 mm. Apart from the need to use aluminum washers 14 to fix the bottom of the cover plate, there is basically no need for excess aluminum rivets to protrude.

[0045] This invention replaces a series of components in the traditional riveting method, such as punching holes in the guide foil, installing the guide foil, installing the washer, and flattening, with a laser welding functional component. During processing, it is only necessary to align the guide foil with the aluminum rivet on the cover plate, and then use the laser to instantly generate high temperature, thereby welding the contact surfaces of the guide foil and the aluminum rivet together at a temperature close to the melting point of aluminum.

[0046] This connection method has the following advantages over traditional riveting methods: More robust connection: The guide foil strip and aluminum rivet are welded together near the melting point under the action of high-energy laser, forming a whole and a more robust connection; Superior performance: The laser welding process connects the foil strip and aluminum rivet without any gaps, resulting in low welding resistance, good conductivity, low heat generation, and the ability to withstand higher currents and strong voltage and current resistance. There will be no oxidation between the aluminum foil strip and the aluminum rivet: the liquid electrolyte attached to the foil strip during laser welding will be completely vaporized at high temperature, which will not affect the welding effect and avoid open circuit phenomenon; The contact area can be set according to the actual situation. If it is necessary to increase the contact area between the guide foil and the aluminum rivet, the aluminum rivet can be made thicker. After laser welding, the resistance and firmness can be further increased. Safe and reliable: Since the conductive foil strip is laser-welded onto the aluminum rivet, the welding surface of the two is relatively smooth. After being made into a capacitor, it will not damage the upper surface of the capacitor core. High-frequency vibration resistance: The aluminum electrolytic capacitor produced by laser welding process has a larger conductive foil area and a larger contact surface with the core, resulting in a more obvious fixing effect. The vibration environment has less impact on the internal structure of the capacitor, and it can be used even in environments with high vibration requirements. High production efficiency: Laser welding requires fewer components, simplifies the riveting process, and improves production efficiency and quality.

[0047] The electrolytic capacitor produced by this invention can increase the internal core length by about 1.5mm compared to a capacitor of the same volume. This means that both the two plates and the insulating electrolytic paper can be widened by about 1.5mm, resulting in a certain increase in the capacitor's maximum capacitance. Taking a standard size of 35*50mm as an example, the plate width is approximately 40mm. Using the electrolytic capacitor structure of this invention, the capacitance can be increased by nearly 4%. For capacitors with a smaller height, the increase will be even greater. This method is particularly effective for capacitors with limited volume. Without changing the core height, about 1.5mm of material can be saved from the original aluminum shell length, and the height of the capacitor can also be reduced by about 1.5mm, making it more effective for applications in spaces with height restrictions.

[0048] In this invention, the cover plate and the guide foil strip are laser-welded, eliminating the need for aluminum rivets to pass through the guide foil strip. Therefore, compared to existing mechanical riveting methods, the aluminum rivet length is shorter. Furthermore, since the capacitor's sealing height is reduced by approximately 1.5mm compared to a conventional capacitor of the same volume, strict requirements are placed on the waist: the waist depth and width cannot exceed 1.5mm. The purpose of the waist sealing is simply to fix the cover plate in place and ensure a tight seal. If the waist is too deep or too wide, it may damage the internal core structure, especially for capacitors with larger internal cores (in conventional capacitors, the gap between the cover plate and the core is relatively large, so the waist depth and width have less impact). The equivalent series resistance of the capacitor in this invention is reduced, resulting in better filtering effect; it can withstand stronger current surges; under the same operating conditions, it has higher reliability and longer service life; it has good vibration resistance and can work normally in various complex environments; the capacitor height can be slightly shortened, which is particularly advantageous in limited spaces.

[0049] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0050] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0051] 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A type of aluminum electrolytic capacitor with solder pads, characterized in that, Includes core, guide foil strip, cover plate, and aluminum rivets; among which: One end of the guide foil is connected to the core, and the other end is exposed on the surface of the core; The aluminum rivets are inserted through the cover plate; The cover plate presses over the top of the core; The guide foil and the aluminum rivet are connected together by laser riveting; when the cover plate is pressed on the top of the core, the welding position of the guide foil and the aluminum rivet abuts against the surface of the core.

2. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, The height of the aluminum rivet after passing through the cover plate is 1.5-2.5mm.

3. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, It also includes an aluminum washer, which is fitted onto the aluminum rivet.

4. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, The area of ​​the compression zone where the guide foil abuts against the core surface is not less than 25 mm². 2 .

5. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, The cover plate is provided with a positive lead-out terminal and a negative lead-out terminal on the side opposite to the core; there are two aluminum rivets, which pass through the positive lead-out terminal and the negative lead-out terminal respectively, and then pass through the cover plate to connect with the guide foil strip.

6. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, It also includes an aluminum shell, with the core placed inside the aluminum shell; the cover plate is fixed to the top of the aluminum shell.

7. The aluminum electrolytic capacitor with solder pads according to claim 6, characterized in that, It also includes a sleeve, which is fitted over the outside of the aluminum shell.

8. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, The core contains an anode foil and a cathode foil, and there are two conductive foil strips, which are respectively connected to the anode foil and the cathode foil.

9. The aluminum electrolytic capacitor with solder pads according to claim 1, characterized in that, The capacitor has a diameter of Φ22~Φ45mm.

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