High-temperature-resistant aluminum electrolytic capacitor

Abstract

The utility model relates to capacitor technical field discloses a kind of high-temperature-resistant aluminum electrolytic capacitor, when using the device, including aluminum shell, sealing rubber plug, negative pole, positive pole, by the electrolyte of being set, using GBL anhydrous, electrolyte containing special organic carboxylic acid or borate and other components, these components can reduce dry speed under high temperature, maintain the ionic conductivity of electrolyte, and the sealing rubber plug silicon rubber of being set has excellent high-temperature resistance and chemical resistance, can effectively prevent electrolyte leakage, guarantee the stability of capacitor under high-temperature environment, by the negative pole aluminum foil and positive pole aluminum foil of being set, select ≥1.7 times rated working voltage anode foil, high-purity, corrosion-resistant good aluminum foil as electrode material, and appropriately increase the thickness of electrode foil, to enhance its anti-aging ability under high temperature, using high-purity aluminum foil after special heat treatment, make its structure more compact, can withstand oxidation and electrochemical corrosion under high temperature, can bring better use prospect.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically to a high-temperature resistant aluminum electrolytic capacitor. Background Technology

[0002] Capacitance describes a device's ability to store electrical charge. It is defined as the ratio of a device's charge to its potential, commonly denoted by C. A capacitor blocks direct current (DC) while allowing alternating current (AC). This characteristic makes it crucial in circuit design, especially in applications requiring DC signal isolation. Capacitors store electrical energy and release it quickly when needed, making them suitable for applications requiring instantaneous high-power output, such as providing temporary power support during power failures. They are commonly used in LED lighting, automotive electronics, medical equipment, aerospace, and other demanding technological fields.

[0003] However, it still has some drawbacks. For example, when existing capacitors are used in high-temperature environments, the capacitors themselves generate a lot of heat during use. Combined with the high-temperature environment, the temperature of the capacitors will be further increased. Prolonged use at high temperatures will greatly reduce their service life and accelerate the aging of the capacitors, resulting in poor high-temperature resistance and short lifespan.

[0004] To address the aforementioned issues, this application proposes a high-temperature resistant aluminum electrolytic capacitor. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature resistant aluminum electrolytic capacitor to solve the problems mentioned in the background art. When the existing capacitors are used in high-temperature environments, the capacitors themselves generate a lot of heat during use. When combined with the high-temperature environment, the temperature of the capacitors will be further increased. Prolonged use at high temperatures will greatly reduce their service life and accelerate the aging of the capacitors, resulting in poor high-temperature resistance and short lifespan.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature resistant aluminum electrolytic capacitor, comprising an aluminum shell, a sealing plug, a negative electrode, a positive electrode, a negative conductor, a positive conductor, and a core element, characterized in that: a sealing plug is fixedly connected to the outer surface of the upper end of the aluminum shell, and a core element is disposed on the inner surface of the aluminum shell; the core element is formed by winding adhesive tape, electrolytic paper, negative electrode aluminum foil, electrolyte, and positive electrode aluminum foil; the negative electrode aluminum foil and the positive electrode aluminum foil are respectively connected to one end of the negative conductor and the positive conductor; the other end of the negative conductor and the positive conductor passes through the upper end of the sealing plug, and the other end of the negative conductor and the positive conductor is electrically connected to one end of the negative electrode and the positive electrode, respectively.

[0007] Preferably, an electrolytic paper 9 is disposed between the negative electrode aluminum foil and the positive electrode aluminum foil, and the thickness of each layer of electrolytic paper 9 is ≥40μm.

[0008] Preferably, the thickness of the positive electrode aluminum foil is 80μm to 120μm, and the thickness of the negative electrode aluminum foil 10 is 20μm to 50μm.

[0009] Preferably, the electrolyte is anhydrous GBL and contains organic carboxylic acids or borate esters.

[0010] Preferably, a mesh aluminum sheet is fixedly connected to the outer wall of the aluminum shell, and thermally conductive adhesive is disposed in the groove of the mesh aluminum sheet.

[0011] Preferably, the outer surfaces of the upper and lower ends of the mesh aluminum sheet and the thermally conductive adhesive are fixedly connected with sealing strips 5.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention utilizes anhydrous GBL electrolyte containing special organic carboxylic acids or borate esters. These components reduce the drying rate at high temperatures and maintain the ionic conductivity of the electrolyte. Furthermore, the silicone rubber sealing plug has excellent high-temperature and chemical resistance, effectively preventing electrolyte leakage and ensuring the stability of the capacitor in high-temperature environments. Additionally, the mesh aluminum sheet 13 and thermally conductive adhesive 14 expand the heat dissipation area, enhance contact with air, and accelerate the release of heat from the capacitor.

[0014] This invention uses negative and positive aluminum foils, selects anode foil with ≥1.7 times the rated working voltage, and uses high-purity, corrosion-resistant aluminum foil as electrode material. The thickness of the electrode foil is appropriately increased to enhance its anti-aging ability at high temperatures. High-purity aluminum foil that has undergone special heat treatment is used to make its structure more compact and able to withstand oxidation and electrochemical corrosion at high temperatures. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a high-temperature resistant aluminum electrolytic capacitor according to the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the element in a high-temperature resistant aluminum electrolytic capacitor according to this utility model.

[0017] Figure 3 This is a schematic diagram of the aluminum shell and mesh aluminum sheet in a high-temperature resistant aluminum electrolytic capacitor according to this utility model.

[0018] In the diagram: 1. Aluminum shell; 2. Sealing plug; 3. Negative electrode; 4. Positive electrode; 5. Negative conductor needle; 6. Positive conductor needle; 7. Element; 8. Adhesive tape; 9. Electrolytic paper; 10. Negative electrode aluminum foil; 11. Electrolyte; 12. Positive electrode aluminum foil; 13. Mesh aluminum sheet; 14. Thermally conductive adhesive; 15. Sealing strip. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Please see Figures 1-3 This utility model provides a technical solution: a high-temperature resistant aluminum electrolytic capacitor, comprising an aluminum shell 1, a sealing plug 2, a negative electrode 3, a positive electrode 4, a negative conductor 5, a positive conductor 6, and a core 7. The sealing plug 2 is fixedly connected to the outer surface of the upper end of the aluminum shell 1, and the core 7 is disposed on the inner surface of the aluminum shell 1. The core 7 is formed by winding adhesive tape 8, electrolytic paper 9, negative electrode aluminum foil 10, electrolyte 11, and positive electrode aluminum foil 12. The negative electrode aluminum foil 10 and the positive electrode aluminum foil 12 are respectively connected to the negative conductor 5 and the positive conductor 6. One end of the guide pin 6 and the other ends of the negative guide pin 5 and the positive guide pin 6 are inserted into the upper end of the sealing rubber plug 2. The other ends of the negative guide pin 5 and the positive guide pin 6 are electrically connected to one end of the negative electrode 3 and the positive electrode 4. The aluminum shell 1 has good heat dissipation performance, which can help the capacitor dissipate heat more effectively under high load and high temperature environment and maintain a stable working state. The aluminum shell 1 has excellent thermal conductivity and can quickly dissipate heat, reducing the performance degradation or damage caused by overheating.

[0021] In this embodiment, as Figures 2-3 As shown, an electrolytic paper 9 is disposed between the negative electrode aluminum foil 10 and the positive electrode aluminum foil 12. The thickness of each layer of electrolytic paper 9 is ≥40μm. The thickness of the positive electrode aluminum foil 12 is 80μm~120μm, and the thickness of the negative electrode aluminum foil 10 is 20μm~50μm. The electrolyte 11 is made of anhydrous GBL containing special organic carboxylic acids or borate esters. The electrolytic paper 9 can uniformly absorb the electrolyte 11, ensuring the normal operation of the electrolytic capacitor. It also serves to isolate the two electrode foils, preventing direct contact between the positive and negative electrodes from causing a short circuit, thus ensuring the capacitor's performance. The stability and reliability are ensured by using high-purity aluminum foil 10 and 12 with special heat treatment, which makes the structure more compact and can withstand oxidation and electrochemical corrosion at high temperatures. A mesh aluminum sheet 13 is fixedly connected to the outer wall of the aluminum shell 1. Thermally conductive adhesive 14 is provided in the groove of the mesh aluminum sheet 13. Sealing strips 15 are fixedly connected to the upper and lower outer surfaces of the mesh aluminum sheet 13 and the thermally conductive adhesive 14. The mesh aluminum sheet 13 and the thermally conductive adhesive 14 can expand the heat dissipation area, enhance the contact with air, and accelerate the release of heat from the capacitor.

[0022] Working principle

[0023] A high-temperature resistant aluminum electrolytic capacitor, in use, utilizes an electrolyte 11, which is made of anhydrous GBL and contains organic carboxylic acids or borate esters. These components reduce the drying rate at high temperatures and maintain the ionic conductivity of the electrolyte. A sealing plug 2, made of silicone rubber, exhibits excellent high-temperature and chemical resistance, effectively preventing electrolyte leakage and ensuring the capacitor's stability under high-temperature conditions. The negative and positive aluminum foils 10 and 12 are made of anode foil with a voltage ≥1.7 times the rated operating voltage. High-purity, corrosion-resistant aluminum foil is used as the electrode material, and the thickness of the electrode foil is appropriately increased to enhance its anti-aging ability at high temperatures. High-purity aluminum foil undergoing special heat treatment is used, making its structure more compact and able to withstand oxidation and electrochemical corrosion at high temperatures. Furthermore, a mesh aluminum sheet 13 and thermally conductive adhesive 14 expand the heat dissipation area, enhance contact with air, and accelerate the release of heat from the capacitor.

[0024] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A high-temperature resistant aluminum electrolytic capacitor, comprising an aluminum shell (1), a sealing plug (2), a negative electrode (3), a positive electrode (4), a negative conductor (5), a positive conductor (6), and a core (7), characterized in that: A sealing plug (2) is fixedly connected to the outer surface of the upper end of the aluminum shell (1). A core (7) is provided on the inner surface of the aluminum shell (1). The core (7) is formed by winding tape (8), electrolytic paper (9), negative aluminum foil (10), electrolyte (11) and positive aluminum foil (12). The negative aluminum foil (10) and the positive aluminum foil (12) are respectively connected to one end of the negative guide needle (5) and the positive guide needle (6). The other end of the negative guide needle (5) and the positive guide needle (6) is inserted through the upper end of the sealing plug (2). The other end of the negative guide needle (5) and the positive guide needle (6) is electrically connected to one end of the negative electrode (3) and the positive electrode (4).

2. The high-temperature resistant aluminum electrolytic capacitor according to claim 1, characterized in that: An electrolytic paper (9) is disposed between the negative electrode aluminum foil (10) and the positive electrode aluminum foil (12), and the thickness of each layer of electrolytic paper (9) is ≥40μm.

3. The high-temperature resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The thickness of the positive electrode aluminum foil (12) is 80μm to 120μm, and the thickness of the negative electrode aluminum foil (10) is 20μm to 50μm.

4. The high-temperature resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The electrolyte (11) is anhydrous GBL and contains organic carboxylic acids or borate esters.

5. A high-temperature resistant aluminum electrolytic capacitor according to claim 1, characterized in that: The outer wall of the aluminum shell (1) is fixedly connected to a mesh aluminum sheet (13), and thermally conductive adhesive (14) is provided in the groove of the mesh aluminum sheet (13).

6. A high-temperature resistant aluminum electrolytic capacitor according to claim 5, characterized in that: The outer surfaces of the upper and lower ends of the mesh aluminum sheet (13) and the thermally conductive adhesive (14) are fixedly connected with sealing strips (15).

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