Guide pin type electrolytic capacitor

Abstract

The utility model discloses a guide needle type electrolytic capacitor belongs to electronic component technical field. The capacitor includes aluminium shell, capacitor core, aluminium pad lead-out sheet and guide needle. Its aluminium shell's diameter is 25mm, and the diameter of guide needle is 1.2mm. Key lies in, and the end of guide needle passes through aluminium pad lead-out sheet and riveting and forms seven riveting petals, to firmly fixed and electrically connected on aluminium pad lead-out sheet with guide needle. Through the synergic design of this large diameter shell body, thickening guide needle and multiple petal riveting structure, the utility model effectively solved the heating and reliability problem of connecting point under the large current, significantly promoted the current carrying capacity and service life, made it can replace the high cost horn type electrolytic capacitor of same specification.

Description

Technical Field

[0001] This utility model relates to the field of electronic components technology, specifically to an electrolytic capacitor, and more particularly to a pin-type electrolytic capacitor with enhanced current carrying capacity and connection reliability. Background Technology

[0002] Aluminum electrolytic capacitors are key passive electronic components widely used in electronic circuits for filtering, energy storage, coupling, and decoupling. Based on the structure of their leads, large-volume aluminum electrolytic capacitors are mainly divided into pin-type (or leaded) electrolytic capacitors and horn-type electrolytic capacitors.

[0003] In existing technologies, the diameter of the aluminum casing of pin-type electrolytic capacitors is typically limited to a maximum of 22mm due to limitations in manufacturing processes and the conductivity of the pins. When circuit designs require larger capacitance and capacitors with diameters of 25mm or greater, the industry generally uses the relatively expensive horn-shaped electrolytic capacitors. With increasingly fierce market competition and rising demands for cost control and efficiency improvement across industries, seeking more cost-effective component solutions while ensuring product performance and quality has become an industry consensus. Therefore, how to overcome the size and performance bottlenecks of existing pin-type electrolytic capacitors and develop a large-diameter pin-type electrolytic capacitor that can replace horn-shaped electrolytic capacitors of the same size and combines high performance with cost advantages is a pressing technical problem to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art and provide a large-diameter needle-type electrolytic capacitor. Through optimized structural design, it significantly improves current carrying capacity and connection reliability, thereby enabling it to replace the traditional horn-shaped electrolytic capacitor of the same specification at a lower cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pin-type electrolytic capacitor includes an aluminum casing, a capacitor core housed within the aluminum casing, an aluminum pad lead plate electrically connected to the capacitor core, and a pin; wherein the diameter of the aluminum casing is 25 mm; the diameter of the pin is 1.2 mm; the end of the pin passes through the aluminum pad lead plate and is riveted to form seven riveted petals to mechanically fix the pin and electrically connect it to the aluminum pad lead plate.

[0007] As a further optimization of this utility model, the capacitor core is impregnated with an electrolyte with a temperature resistance rating of 125°C.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] (1) By increasing the aluminum shell diameter of the lead-type capacitor from the industry standard of 22mm to 25mm and optimizing the internal structure, this utility model can achieve the same physical size as the horn-type capacitor, thereby directly replacing the high-cost horn-type capacitor in some application scenarios and significantly reducing the customer's procurement cost.

[0010] (2) This utility model creatively increases the diameter of the guide pin to 1.2mm and sets the number of riveting petals between it and the aluminum pad lead to seven. This combination design enhances the current conduction capacity of the guide pin itself and greatly increases the contact area of ​​the riveting point, effectively reducing the contact resistance and local temperature rise when a large current passes through, thereby improving the capacitor's ability to withstand ripple current and its long-term reliability, and extending its service life.

[0011] (3) By using a high-temperature electrolyte at 125℃, the product’s high-temperature resistance and overall electrical parameters are further improved, ensuring that its performance is comparable to that of the replaced horn-shaped capacitor and meets the stringent circuit requirements.

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, embodiments of this utility model are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0015] In the diagram: 1-CP line, 2-aluminum pad lead, 3-riveting point petal, 4-sleeve, 5-aluminum shell, 6-capacitor core. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0017] Please see Figure 1This embodiment discloses a pin-type electrolytic capacitor. The capacitor mainly includes a cylindrical aluminum casing 5 and an assembly sealed inside the aluminum casing 5 by a sealing element (not shown). The internal assembly includes a capacitor core 6 formed by winding positive and negative aluminum foil and electrolytic paper. The positive and negative terminals of the capacitor core 6 are electrically connected to external leads, i.e., pins 1, via aluminum pad leads 2. A sleeve 4 is used to protect the exterior of the capacitor.

[0018] The core innovation of this embodiment lies in its unique combination of structural parameters, which is explained in detail below:

[0019] First, in order to achieve a large capacity and replace the equivalent horn capacitor, the diameter of the aluminum casing 5 in this embodiment is specially designed to be 25mm. This size breaks through the industry limit of 22mm for traditional pin-type capacitors, providing a physical basis for achieving a capacitance comparable to a 25mm horn capacitor.

[0020] Secondly, to match the higher rated current and ripple current brought about by the 25mm large-diameter capacitor, the conductor 1, which serves as the main current channel, was reinforced. The diameter of conductor 1 was increased from the industry standard of 1.0mm to 1.2mm. The thickened conductor 1 has lower self-resistance, enabling it to carry larger currents without overheating, thus ensuring the efficiency and safety of power transmission.

[0021] Most importantly, to address the reliability issue of the connection point between the guide pin and the internal electrode under high current, this embodiment has made a creative improvement to the riveting structure. For example... Figure 1 As shown, the inner end of the guide pin 1 passes through the through hole in the aluminum pad lead-out piece 2, and its protruding end is riveted by a stamping die, causing it to plastically deform and unfold, forming a riveted petal 3 for fixing and conducting electricity. The innovation of this embodiment lies in the precise design of seven riveted petals 3. Compared to the fewer petals in existing technologies, the seven-petal structure significantly increases the physical contact area between the guide pin 1 and the aluminum pad lead-out piece 2, allowing the current to be distributed more evenly on the contact surface. This significantly reduces contact resistance, effectively suppresses heating at the connection point under high current surges or high-frequency ripple currents, prevents connection failure due to localized overheating, and greatly improves the long-term stability and service life of the capacitor.

[0022] Furthermore, as a preferred embodiment, the capacitor core 6 is impregnated with a high-performance electrolyte with a temperature rating of 125°C. This electrolyte has a lower equivalent series resistance (ESR) and better high-temperature stability, enabling the entire capacitor to withstand higher ripple currents and maintain stable performance in more demanding operating environments.

[0023] In summary, this utility model organically combines three key technical features—a 25mm diameter aluminum shell 5, a 1.2mm diameter guide pin 1, and a riveting structure with seven riveting petals 3—to work synergistically and successfully solve the technical bottleneck that has long restricted the development of guide pin type capacitors towards larger sizes and higher performance. It provides a new product of guide pin type electrolytic capacitor with reliable performance and significant cost advantages.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pin-type electrolytic capacitor, comprising an aluminum casing (5), a capacitor core (6) housed within the aluminum casing (5), an aluminum pad lead (2) electrically connected to the capacitor core (6), and a pin (1), characterized in that: The aluminum shell (5) has a diameter of 25 mm; the guide pin (1) has a diameter of 1.2 mm; the end of the guide pin (1) passes through the aluminum pad lead-out piece (2) and is riveted to form seven riveted petals (3) to mechanically fix the guide pin (1) and electrically connect it to the aluminum pad lead-out piece (2).

2. The pin-type electrolytic capacitor according to claim 1, characterized in that, The capacitor core (6) is impregnated with an electrolyte with a temperature resistance rating of 125°C.

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