Aluminum electrolytic capacitor with high ripple current resistance

Abstract

An aluminum electrolytic capacitor with high ripple current resistance comprises a shell, a core bag and a sealing element. The core bag is hermetically arranged in the shell through a sealing piece; a heat dissipation plate made of graphene or copper is arranged between the bottom of the core package and the bottom of the shell; the radiating plate is contacted with the bottom of the shell; and the cathode foil in the core package extends out of the bottom of the core package and is contacted with the radiating plate. According to the utility model, because the heat conduction coefficient of the heat dissipation plate made of graphene or copper is high, the heat generated in the core package can be quickly transmitted to the shell through the cathode foil, so that the purpose of heat dissipation is achieved, and the ripple current resistance of the product is improved.

Description

Technical Field

[0001] This utility model relates to an aluminum electrolytic capacitor, and more particularly to an aluminum electrolytic capacitor with strong ripple current resistance. Background Technology

[0002] With the rise of new energy and AI industries, the requirements for ripple current tolerance of products are increasing, while product size cannot be increased. This situation limits the application and promotion of aluminum electrolytic capacitors. High-ripple-tolerant liquid aluminum electrolytic capacitors, due to their excellent ripple current tolerance and stability, are widely used in fields requiring long-term high-power operation, such as photovoltaics, data centers, communication equipment, and industrial automation. These fields have extremely high requirements for the ripple current tolerance and reliability of capacitors. Once a product fails, the repair cost is very high. Therefore, high-ripple-tolerant products have a significant advantage.

[0003] Currently, improving the ripple current withstand capability of aluminum electrolytic capacitors is generally achieved by improving the heat dissipation of the product. However, the current methods for improving the heat dissipation of the product are usually to accelerate the heat dissipation of the outer casing surface, such as patent: 219393196U, an aluminum electrolytic capacitor with good heat dissipation performance. However, the key to improving the heat dissipation performance of the product lies in how to quickly transfer the heat generated in the core to the outer casing surface, and there is currently no good method to achieve this. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an aluminum electrolytic capacitor with strong ripple current resistance.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: an aluminum electrolytic capacitor with strong ripple current resistance, comprising a shell, a core, and a sealing element; the core is sealed inside the shell by the sealing element; a heat sink made of graphene or copper is disposed between the bottom of the core and the bottom of the shell; the heat sink is in contact with the bottom of the shell; the cathode foil in the core extends out of the bottom of the core and contacts the heat sink.

[0006] Preferably, in the aluminum electrolytic capacitor described above with strong ripple current resistance, the core package includes an anode foil, electrolytic paper, and a cathode foil. The anode foil, electrolytic paper, and cathode foil are wound to form a cylindrical core package. The electrolytic paper separates the cathode foil and the anode foil. The cathode foil extends 0.1-2 mm beyond the electrolytic paper at the bottom of the core package.

[0007] Preferably, in the aluminum electrolytic capacitor described above with strong ripple current resistance, the thickness of the heat sink is less than or equal to 2 mm.

[0008] Preferably, the aluminum electrolytic capacitor with strong ripple current resistance described above has through holes provided on the heat sink.

[0009] Preferably, the aluminum electrolytic capacitor with strong ripple current resistance described above has an explosion-proof valve installed on the side wall of the housing.

[0010] Preferably, the bottom of the aforementioned aluminum electrolytic capacitor with strong ripple current resistance has printed identification information or an identification film affixed thereto.

[0011] Compared with the prior art, the advantages of this utility model are as follows: In this utility model, because the heat dissipation plate made of graphene or copper has a high thermal conductivity, it can quickly transfer the heat generated inside the core package to the outer shell through the cathode foil to achieve the purpose of heat dissipation, thereby improving the product's ability to withstand ripple current. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the aluminum electrolytic capacitor with strong ripple current resistance in Example 1.

[0013] Figure 2 This is a cross-sectional view of the aluminum electrolytic capacitor with strong ripple current resistance in Example 1.

[0014] Figure 3 This is a schematic diagram of the core package after it has been unfolded in Example 1.

[0015] Figure 4 A cross-sectional view of an aluminum electrolytic capacitor with a strong ripple current resistance, in which the explosion-proof valve is located at the bottom of the casing.

[0016] Figure 5 This is a schematic diagram of the heat sink structure.

[0017] Legend

[0018] 1. Outer shell; 2. Core package; 21. Anode foil; 22. Electrolytic paper; 23. Cathode foil; 3. Sealing element; 4. Heat sink plate; 41. Through hole; 5. Explosion-proof valve; 6. Sleeve. Detailed Implementation

[0019] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0020] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0021] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention. Example 1

[0022] like Figure 1 and Figure 2 The aluminum electrolytic capacitor shown includes a casing 1, a core 2, and a sealing element 3. The core 2 is sealed inside the casing 1 by the sealing element 3. A heat sink 4 made of graphene or copper is disposed between the bottom of the core 2 and the bottom of the casing 1. The heat sink 4 is in contact with the bottom of the casing 1. The cathode foil 23 in the core 2 extends out from the bottom of the core 2 and contacts the heat sink 4. In this embodiment, the thickness of the heat sink 4 is 0.5 mm, and the thickness of the heat sink 4 is generally less than or equal to 2 mm. The casing 1 is made of aluminum; the sealing element 3 is a cover plate.

[0023] In this embodiment, as Figure 3 As shown, the core package 2 includes an anode foil 21, electrolytic paper 22, and a cathode foil 23. The anode foil 21, electrolytic paper 22, and cathode foil 23 are wound to form a cylindrical core package 2. The electrolytic paper 22 separates the cathode foil 23 and the anode foil 21. The cathode foil 23 extends 0.1-2 mm beyond the bottom of the core package 2. In this embodiment, an anode conductive strip and a cathode conductive strip are electrically connected to the anode foil 21 and the cathode foil 23, respectively. After the core package 2 is wound, the cathode foil 23 extends beyond the bottom of the core package 2. Thus, after the core package 2 is installed into the outer casing 1, since the heat sink 4 is pre-placed at the bottom of the outer casing 1, the extended cathode foil 23 will contact the heat sink 4. When an aluminum electrolytic capacitor encounters a large ripple current, the core 2 heats up. At this time, the heat can be transferred to the heat sink 4 in time through the cathode foil 23. Since the heat sink 4 is in close contact with the outer shell 1, the heat can be dissipated in time through the outer shell 1, preventing the explosion-proof valve 5 from opening or bulging, thereby ensuring the life of the core 2.

[0024] In this embodiment, the explosion-proof valve 5 on the outer casing 1 has two configurations; such as Figure 1 As shown, in the first configuration, the explosion-proof valve 5 is mounted on the side wall of the housing 1. In this first configuration, the housing 1 is generally not fitted with a sleeve 6 to prevent the sleeve 6 from affecting the opening of the explosion-proof valve 5; the capacitor's marking information can be printed on the outer surface of the bottom of the housing 1 or affixed to the outer surface of the bottom of the housing 1 in the form of a marking film. For example... Figure 4As shown in Figure 5, the second configuration involves the explosion-proof valve 5 being mounted on the bottom of the housing 1. In this configuration, as illustrated in Figure 5, a through hole 41 needs to be provided on the heat sink 4. The position of the through hole 41 is preferably corresponding to the center of the explosion-proof valve 5, which is generally located at the center of the bottom of the housing 1. In this configuration, a sleeve 6 can be fitted onto the housing 1. In this embodiment, the explosion-proof valve 5 is configured using the first configuration.

[0025] In this embodiment, since the heat sink 4 made of graphene or copper has a high thermal conductivity, it can quickly transfer the heat generated inside the core package 2 to the outer shell 1 through the cathode foil 23, thereby achieving the purpose of heat dissipation and improving the product's ability to withstand ripple current. Example 2

[0026] In this embodiment, an anode guide pin and a cathode guide pin are electrically connected to the anode foil 21 and the cathode foil 23, respectively. The explosion-proof valve 5 is configured using the second configuration in Embodiment 1, that is, the explosion-proof valve 5 is located on the bottom of the housing 1. The sealing element is a rubber plug. The other parts of this embodiment are the same as in Embodiment 1.

Claims

1. An aluminum electrolytic capacitor with strong ripple current resistance, characterized in that: It includes an outer shell, a core package, and a seal; the core package is sealed inside the outer shell by the seal; a heat sink made of graphene or copper is disposed between the bottom of the core package and the bottom of the outer shell; the heat sink is in contact with the bottom of the outer shell; the cathode foil in the core package extends out of the bottom of the core package and contacts the heat sink.

2. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, characterized in that: The core package includes an anode foil, electrolytic paper, and a cathode foil. The anode foil, electrolytic paper, and cathode foil are wound together to form a cylindrical core package. The electrolytic paper separates the cathode foil and the anode foil. The cathode foil extends 0.1-2 mm beyond the electrolytic paper at the bottom of the core package.

3. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, characterized in that: The thickness of the heat sink is less than or equal to 2 mm.

4. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, characterized in that: The heat sink is provided with through holes.

5. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 1, characterized in that: An explosion-proof valve is provided on the side wall of the outer casing.

6. The aluminum electrolytic capacitor with strong ripple current resistance according to claim 5, characterized in that: The bottom of the outer casing is printed with identification information or has an identification film affixed.

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