Anti-breakdown aluminum electrolytic capacitor

Abstract

The utility model provides an anti-breakdown aluminum electrolytic capacitor, which comprises a shell, a core and a pin, the core is arranged in the shell, a rubber plug is arranged at the bottom of the shell, the core is formed by winding anode foil, cathode foil and electrolytic paper, one end of the pin is connected with the corresponding anode foil or cathode foil, a protective layer is arranged at the joint of the anode foil and the cathode foil, and the other end of the pin is connected with the electrolytic paper. The other end of the pin penetrates through the rubber plug downwards to form a connecting end, and an anti-explosion unit is arranged on the top of the rubber plug. Therefore, the rubber plug is prevented from being impacted by pressure, the sealing performance of the rubber plug is effectively improved, the explosion-proof strength of the capacitor is fundamentally improved, and after the scheme is adopted, the structure is reasonable, the explosion-proof strength is large, and the anti-breakdown effect is good.

Description

Technical Field

[0001] This utility model relates to the field of electronic components technology, and in particular to a breakdown-resistant aluminum electrolytic capacitor. Background Technology

[0002] Traditional capacitor pin solder sections are cylindrical or flat. While cylindrical solder sections do not affect the electrolytic paper, they create large gaps on both sides of the pin, significantly increasing the core diameter. Furthermore, the small contact area between the pin and the electrode foil results in a weak weld. Flat pins increase the welding surface area, but burrs easily form along the edges, piercing the electrolytic paper. Gaps also form on both sides of the core. Moreover, during capacitor use, high internal pressure can impact the rubber stopper, causing it to detach and burst, damaging the circuit. Summary of the Invention

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a breakdown-proof aluminum electrolytic capacitor that prevents pressure impact on the rubber stopper, effectively increases the sealing performance of the rubber stopper, and fundamentally increases the explosion-proof strength of the capacitor. The structure after adopting this solution is reasonable, the explosion-proof strength is large, and the breakdown-proof effect is good.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: a breakdown-resistant aluminum electrolytic capacitor, comprising a shell, a core, and pins, wherein the core is provided inside the shell, and a rubber stopper is provided at the bottom of the shell. The core is formed by winding an anode foil, a cathode foil, and electrolytic paper. One end of one pin is connected to the corresponding anode foil or cathode foil, and a protective layer is provided at the connection point. The other end of the pin passes downward through the rubber stopper to form a connection end, and an explosion-proof unit is provided on the top of the rubber stopper.

[0005] The explosion-proof unit includes an outer explosion-proof ring and a pin explosion-proof ring. The outer explosion-proof ring is integrally formed by extending upward from the top edge of the rubber stopper. The outer explosion-proof ring is annular and gradually narrows from top to bottom to form a funnel shape. The outer diameter of the top of the outer explosion-proof ring is equal to or smaller than the outer diameter of the rubber stopper. The pin explosion-proof ring surrounds the pin hole of the rubber stopper and is integrally formed by extending upward from the top of the rubber stopper. The pin explosion-proof ring is annular and gradually expands from top to bottom to form a cone shape.

[0006] The outer circumferential surface of the outer explosion-proof ring is raised in an arc shape, and the inner circumferential surface of the pin-type explosion-proof ring is raised in an arc shape.

[0007] The protective layer is made of sheet-like electrolytic paper and covers or adheres to the surface of the weld between the pin and the anode foil or cathode foil.

[0008] The cross-section of the connection between the pin and the electrode foil is arc-shaped or crescent-shaped, with its inner arc surface facing the core axis, and the two sides of the pin are smoothly transitioned by an arc.

[0009] In this invention, after adopting the above-mentioned solution, the connection between the pin and the electrode foil is covered with electrolytic paper to form a protective layer. Through the protection of the double-layer electrolytic paper, the solder joint of the pin is prevented from being punctured. When the gas pressure inside the capacitor is high, the pressure is applied to the explosion-proof ring, and the top of the explosion-proof ring begins to be compressed, causing the top of the explosion-proof ring to expand outward or compress inward, increasing the contact tightness between the rubber stopper and the outer shell and the pin, thereby preventing pressure from impacting the rubber stopper and effectively increasing the sealing performance of the rubber stopper. This fundamentally increases the explosion-proof strength of the capacitor. The structure after adopting this solution is reasonable, the explosion-proof strength is large, and the breakdown prevention effect is good. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0011] Figure 2 This is a cross-sectional view of the present invention.

[0012] Figure 3 This is a schematic diagram of the rubber stopper of this utility model.

[0013] Figure 4 This is a schematic diagram of the pin welding section of this utility model.

[0014] Figure 5 This is a schematic diagram of the protective layer of this utility model.

[0015] Figure 6 This is a schematic diagram of the core of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to all the accompanying drawings. A preferred embodiment of the present invention is as follows: (See attached drawings) Figure 1 To be continued Figure 6 The breakdown-resistant aluminum electrolytic capacitor described in this embodiment includes a shell 1, a core 2, and pins 4. The core 2 is housed inside the shell 1, and a rubber stopper 3 is provided at the bottom of the shell 1. The core 2 is formed by winding an anode foil, a cathode foil, and electrolytic paper. One end of the pin 4 is connected to the corresponding anode foil or cathode foil, and a protective layer 5 is provided at the connection point. The other end of the pin 4 passes downward through the rubber stopper 3 to form a connection end. An explosion-proof unit is provided at the top of the rubber stopper 3. The cross-section of the connection point between the pin 4 and the electrode foil is arc-shaped or crescent-shaped, and its inner arc surface is directly opposite the axis of the core 2. The two sides of the pin 4 adopt a smooth arc transition.

[0017] The explosion-proof unit includes an outer explosion-proof ring 6 and a pin explosion-proof ring 7. The outer explosion-proof ring 6 is integrally formed by extending upward from the top edge of the rubber stopper 3. The outer explosion-proof ring 6 is annular and gradually tapers from top to bottom to form a funnel shape. The outer diameter of the top of the outer explosion-proof ring 6 is equal to or smaller than the outer diameter of the rubber stopper 3. The outer circumferential surface of the outer explosion-proof ring 6 is convex and arc-shaped. The inner circumferential surface of the pin explosion-proof ring 7 is convex and arc-shaped. The pin explosion-proof ring 7 surrounds the pin hole of the rubber stopper 3 and is integrally formed by extending upward from the top of the rubber stopper 3. The pin explosion-proof ring 7 is annular and gradually expands from top to bottom to form a cone shape. The protective layer 5 is made of sheet-like electrolytic paper and covers or adheres to the surface of the weld between the pin 4 and the anode foil or cathode foil.

[0018] After adopting the above scheme, the connection between the pin and the electrode foil is covered with electrolytic paper to form a protective layer. This double-layer electrolytic protection prevents the pin's solder joint from being punctured. The solder joint of the pin has an arc-shaped cross-section, which increases the contact area between the solder joint and the electrode foil. Simultaneously, the arc-shaped solder joint fits better with the wound core, and the sides of the solder joint do not warp, preventing tearing of the electrolytic paper during winding. With the explosion-proof unit, when the gas pressure inside the capacitor is high, the pressure applied to the outer explosion-proof ring causes the top of the outer explosion-proof ring to expand outwards. The tightness of contact between the outer explosion-proof ring and the inner wall of the outer shell gradually increases. The greater the internal pressure, the tighter the contact between the outer explosion-proof ring and the inner wall of the outer shell. When pressure is applied to the pin explosion-proof ring, the top of the pin explosion-proof ring begins to be compressed, causing the top of the pin explosion-proof ring to contract inward and contact the outer circumference of the pin. The greater the internal pressure, the tighter the contact between the pin explosion-proof ring and the pin. This prevents pressure from impacting the rubber stopper, effectively increases the sealing performance of the rubber stopper, and fundamentally increases the explosion-proof strength of the capacitor. The structure after adopting this solution is reasonable, the explosion-proof strength is large, and the breakdown protection effect is good.

[0019] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A breakdown-resistant aluminum electrolytic capacitor, comprising a casing (1), a core (2), and pins (4), characterized in that: The outer shell (1) is provided with a core (2) and a rubber stopper (3) at the bottom of the outer shell (1). The core (2) is formed by winding an anode foil, a cathode foil, and electrolytic paper. One end of the pin (4) is connected to the corresponding anode foil or cathode foil, and a protective layer (5) is provided at the connection. The other end of the pin (4) passes downward through the rubber stopper (3) to form a connection end. The top of the rubber stopper (3) is provided with an explosion-proof unit. The explosion-proof unit includes an outer explosion-proof ring (6) and a pin explosion-proof ring (7). The outer explosion-proof ring (6) is formed by extending upward from the top edge of the rubber stopper (3). The outer explosion-proof ring (6) is annular and gradually shrinks from top to bottom to form a funnel shape. The outer diameter of the top of the outer explosion-proof ring (6) is equal to or smaller than the outer diameter of the rubber stopper (3). The pin explosion-proof ring (7) surrounds the pin hole of the rubber stopper (3) and is formed by extending upward from the top of the rubber stopper (3). The pin explosion-proof ring (7) is annular and gradually expands from top to bottom to form a cone shape.

2. The breakdown-resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The outer circumferential ring (6) has a raised arc surface on its outer periphery, and the inner circumferential ring (7) has a raised arc surface on its inner periphery.

3. The breakdown-resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The protective layer (5) is made of sheet-like electrolytic paper and covers or is bonded to the surface of the weld between the pin (4) and the anode foil or cathode foil.

4. The breakdown-resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The cross-section of the connection between the pin (4) and the electrode foil is arc-shaped or crescent-shaped, with its inner arc surface facing the axis of the core (2), and the two sides of the pin (4) are smoothly transitioned by arc.

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