Surface-mounted aluminum electrolytic capacitor with anti-erosion function

Abstract

The utility model discloses a surface-mounted aluminum electrolytic capacitor with an anti-erosion function, and the surface-mounted aluminum electrolytic capacitor with the anti-erosion function comprises an aluminum electrolytic capacitor body, the bottom of the aluminum electrolytic capacitor body is fixedly connected with a fixed pedestal assembly, the fixed pedestal assembly comprises a pedestal and surface-mounted pins, and the surface-mounted pins are fixedly connected with the pedestal. Two sides of the bottom surface of the base are fixedly connected with patch pins; in order to solve the problem that in the prior art, when a common surface-mounted aluminum electrolytic capacitor is used in a high-temperature humid or dust environment for a long time, the service life of the common surface-mounted aluminum electrolytic capacitor is prone to being shortened due to external moisture and dust erosion, the application designs a protective shell assembly. The aluminum electrolytic capacitor body can be effectively protected through the protective shell assembly, meanwhile, the heat dissipation effect is improved, the problem that a circuit board is corroded due to electrolyte leakage can be further effectively solved, and the aluminum electrolytic capacitor is suitable for application and popularization.

Description

Technical Field

[0001] This application relates to the field of aluminum electrolytic capacitor technology, and in particular to surface-mount aluminum electrolytic capacitors with anti-corrosion function. Background Technology

[0002] As a key passive component in electronic circuits, aluminum electrolytic capacitors are widely used in power supply filtering, signal coupling, energy storage and other fields due to their advantages such as high capacitance density and low cost. Surface mount aluminum electrolytic capacitors have become the first choice for modern high-density electronic equipment due to their miniaturization and surface mount technology (SMT) compatibility.

[0003] However, as electronic devices expand into extreme environments, such as high temperature and humidity, industrial dust, vibration and shock, traditional capacitors are mostly encapsulated with epoxy resin or plastic. Their sealing performance is easily degraded under long-term humid and hot cycling, especially in high temperature, humid and dusty environments, which leads to increased leakage current and accelerated capacity decay.

[0004] Electrolyte is prone to vaporization and expansion under high temperature or overpressure conditions; existing pressure relief structures mostly use single linear grooves, which are prone to forming irregular cracks when they rupture. After pressure relief, they cannot maintain an effective seal, and external contaminants can enter back through the cracks, causing the internal electrolyte to dry out and fail.

[0005] Traditional leak-proof designs rely on the physical seal between the pins and the base, but due to the difference in thermal expansion coefficients, micron-level gaps are easily generated under temperature cycling; the electrolyte can migrate along the pins at a rate of up to 0.5 mm / h through capillary action, leading to corrosion of the copper foil on the circuit board.

[0006] In other words, existing technologies have the following technical problems: ordinary aluminum electrolytic capacitors are prone to electrolyte leakage and corrosion in high-temperature and high-humidity environments. Therefore, a surface-mount aluminum electrolytic capacitor with anti-corrosion function is proposed to address the above problems. Summary of the Invention

[0007] This embodiment provides a surface-mount aluminum electrolytic capacitor with anti-corrosion function to solve the problem of corrosion caused by electrolyte leakage in ordinary aluminum electrolytic capacitors with ordinary terminals in the prior art under high temperature and high humidity environments.

[0008] According to one aspect of this application, a surface-mount aluminum electrolytic capacitor with corrosion resistance is provided, the surface-mount aluminum electrolytic capacitor with corrosion resistance comprising:

[0009] An aluminum electrolytic capacitor body, wherein a fixed base assembly is fixedly connected to the bottom of the aluminum electrolytic capacitor body, the fixed base assembly includes a base and surface mount pins, and surface mount pins are fixedly connected to both sides of the bottom surface of the base.

[0010] A protective housing assembly is disposed on the outer surface of the aluminum electrolytic capacitor body and is fixedly connected to the aluminum electrolytic capacitor body. The protective housing assembly is used to protect the aluminum electrolytic capacitor body and prevent electrolyte leakage.

[0011] Furthermore, the aluminum electrolytic capacitor body includes a capacitor body, leads, and scribe lines, with scribe lines provided on the upper surface of the capacitor body.

[0012] Furthermore, the scoring lines are cross-shaped.

[0013] Furthermore, the protective housing assembly includes a protective housing, a thermally conductive sheet, a rubber sealing ring, and a polymer hydrogel ring. The protective housing is fixedly disposed on the outer surface of the capacitor body, and a rubber sealing ring is fixedly connected to the contact end face between the protective housing and the capacitor body.

[0014] Furthermore, several heat-conducting fins are fixedly disposed on the outer surface of the protective shell.

[0015] Furthermore, several of the heat-conducting sheets are arranged in a ring, with one end of each heat-conducting sheet extending to the outer wall of the capacitor body and contacting the capacitor body.

[0016] Furthermore, a polymer hydrogel ring is fixedly connected to the upper wall of the inner cavity of the protective shell, and the bottom surface of the polymer hydrogel ring is in contact with the upper surface of the capacitor body.

[0017] Furthermore, the capacitor body has pins on its bottom surface, and these pins are connected to surface mount pins.

[0018] Furthermore, the pins are wavy, and several V-shaped grooves are formed on the outer surface of the heat-conducting sheet.

[0019] Furthermore, a circular groove is provided on the upper surface of the base, and a flow guide groove extends from the side of the circular groove to the pin position of the capacitor body. The interior of the circular groove is filled with a polymer hydrogel sheet.

[0020] In order to solve the problem that ordinary surface-mount aluminum electrolytic capacitors are prone to reduced lifespan due to external moisture and dust corrosion when used in high temperature, humidity or dust environments for a long time, this application designs a protective shell assembly. The protective shell assembly can effectively protect the aluminum electrolytic capacitor body, improve heat dissipation, and further effectively prevent electrolyte leakage that could lead to circuit board corrosion. It is suitable for widespread use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a protective housing assembly according to one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the overall bottom structure of one embodiment of this application;

[0025] Figure 4 This is a top view of the structure of an aluminum electrolytic capacitor body according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the overall cross-section of one embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the pin structure according to one embodiment of this application.

[0028] In the picture:

[0029] Aluminum electrolytic capacitor body 1, capacitor body 101, leads 102, V-shaped groove 1021, and serration line 103;

[0030] Fixed base assembly 2, base 201, patch pin 202, circular groove 203, flow channel 204, polymer hydrogel sheet 205;

[0031] Protective housing assembly 3, protective housing 301, heat-conducting sheet 302, rubber sealing ring 303, polymer hydrogel ring 304. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0035] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0037] Please see Figure 1-6 As shown, a surface-mount aluminum electrolytic capacitor with anti-corrosion function includes:

[0038] An aluminum electrolytic capacitor body 1, with a fixed base assembly 2 fixedly connected to the bottom of the aluminum electrolytic capacitor body 1. The fixed base assembly 2 includes a base 201 and surface mount pins 202. Surface mount pins 202 are fixedly connected to both sides of the bottom surface of the base 201.

[0039] The protective housing assembly 3 is disposed on the outer surface of the aluminum electrolytic capacitor body 1 and is fixedly connected to the aluminum electrolytic capacitor body 1. The protective housing assembly 3 is used to protect the aluminum electrolytic capacitor body 1 and prevent electrolyte leakage.

[0040] Through the above technical solution, the protective shell component 3 can effectively protect the aluminum electrolytic capacitor body 1, while improving the heat dissipation effect. Furthermore, it can effectively avoid the problem of electrolyte leakage causing corrosion of the circuit board, making it suitable for widespread use.

[0041] The aluminum electrolytic capacitor body 1 includes a capacitor body 101, leads 102 and scribing lines 103, and the scribing lines 103 are provided on the upper surface of the capacitor body 101.

[0042] The scribing line 103 is cross-shaped. Through this technical solution, the scribing line 103 can play a role in relieving pressure. When the internal pressure of the capacitor body 101 is too high, the scribing line breaks and forms a crack, thereby relieving pressure.

[0043] The protective shell assembly 3 includes a protective shell 301, a heat-conducting sheet 302, a rubber sealing ring 303, and a polymer hydrogel ring 304. The protective shell 301 is fixedly disposed on the outer surface of the capacitor body 101. The rubber sealing ring 303 is fixedly connected to the contact end face between the protective shell 301 and the capacitor body 101. Through this technical solution, the protective shell 301 can protect the capacitor body 101, effectively preventing corrosion caused by external dust and moisture. At the same time, it can also protect against cracks generated during pressure relief, preventing external corrosion damage caused by external forces entering the interior of the capacitor body 101 through the cracks.

[0044] Several heat-conducting plates 302 are fixedly installed on the outer surface of the protective shell 301.

[0045] The heat-conducting sheets 302 are arranged in a ring. One end of each heat-conducting sheet 302 extends to the outer wall of the capacitor body 101 and contacts the capacitor body 101. Through this technical solution, the heat-conducting sheets 302 can conduct heat and increase the air contact area, thereby improving the heat dissipation effect of the aluminum electrolytic capacitor body 1.

[0046] A polymer hydrogel ring 304 is fixedly connected to the upper wall of the inner cavity of the protective shell 301. The bottom surface of the polymer hydrogel ring 304 is in contact with the upper surface of the capacitor body 101. Through this technical solution, the polymer hydrogel ring 304 can absorb electrolyte leakage when it occurs, thus avoiding corrosion and pollution caused by leakage.

[0047] The capacitor body 101 has pins 102 on its bottom surface, and the pins 102 are connected to the surface mount pins 202.

[0048] The pin 102 is wavy, and several V-shaped grooves 1021 are formed on the outer surface of the heat-conducting sheet 302. With this technical solution, when the electrolyte inside the capacitor flows along the pin 102 through capillary action, the wavy pin 102 can greatly increase the flow distance, thereby reducing the phenomenon of flowing into the circuit board. At the same time, the V-shaped grooves 1021 can further act as a barrier when the electrolyte flows along the pin 102, further reducing the phenomenon of seeping into the circuit board.

[0049] A circular groove 203 is provided on the upper surface of the base 201. A guide groove 204 extends from the side of the circular groove 203 and extends to the pin position of the capacitor body 101. The interior of the circular groove 203 is filled with a polymer hydrogel sheet 205. With this technical solution, when electrolyte seeps out at the pin position, the guide groove 204 can guide the electrolyte, allowing it to flow into the interior of the circular groove 203 and be absorbed by the polymer hydrogel sheet 205, thus avoiding the phenomenon of electrolyte corroding the circuit board.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A surface-mount aluminum electrolytic capacitor with anti-corrosion function, characterized in that: include: The aluminum electrolytic capacitor body (1), the fixed base assembly (2), and the protective shell assembly (3); The aluminum electrolytic capacitor body (1) is fixedly connected to a fixed base assembly (2) at the bottom. The fixed base assembly (2) includes a base (201) and surface mount pins (202) symmetrically arranged on both sides of the bottom surface of the base (201). The protective shell assembly (3) covers the outer surface of the aluminum electrolytic capacitor body (1), and includes a protective shell (301), a heat-conducting sheet (302), a rubber sealing ring (303), and a polymer hydrogel ring (304). The protective shell (301) is sealed to the capacitor body (101) through the rubber sealing ring (303). The heat-conducting sheet (302) is distributed in a ring on the outer surface of the protective shell (301) and contacts the outer wall of the capacitor body (101).

2. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 1, characterized in that: The aluminum electrolytic capacitor body (1) includes a capacitor body (101), pins (102) and a scribe line (103). The capacitor body (101) has a cross-shaped scribe line (103) on the top and a wavy pin (102) on the bottom. The pin (102) is electrically connected to the surface mount pin (202).

3. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 2, characterized in that: The surface of the heat-conducting sheet (302) is provided with a plurality of V-shaped grooves (1021), which are spaced apart along the extension direction of the pin (102).

4. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 1, characterized in that: The rubber sealing ring (303) is disposed on the contact end face between the protective shell (301) and the capacitor body (101) to form an annular sealing structure.

5. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 1, characterized in that: The polymer hydrogel ring (304) is fixed to the top of the inner cavity of the protective shell (301), and its bottom surface maintains contact pressure with the upper surface of the capacitor body (101).

6. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 2, characterized in that: The depth of the scribe line (103) is 1 / 3 to 1 / 2 of the thickness of the capacitor body (101) shell, and its intersection point is located at the top center of the capacitor body (101).

7. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 1, characterized in that: The upper surface of the base (201) is provided with a circular groove (203), which extends to the root of the pin (102) through a guide groove (204), and the circular groove (203) is filled with a polymer hydrogel sheet (205).

8. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 7, characterized in that: The cross-section of the guide groove (204) is V-shaped, and the groove depth gradually decreases from the circular groove (203) towards the pin (102).

9. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 7, characterized in that: The thickness of the polymer hydrogel sheet (205) is 0.5-0.8 times the depth of the circular groove (203).

10. The surface-mount aluminum electrolytic capacitor with anti-corrosion function according to claim 2, characterized in that: The peak spacing of the wavy pin (102) is 3-5 times the pin diameter, and the trough depth is 0.8-1.2 times the pin diameter.

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