High-temperature-resistant safety capacitor
Patent Information
- Application Number
- CN202522298029.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-30
AI Technical Summary
[0004]本实用新型的目的在于提供一种耐高温安规电容，以解决上述背景技术中提出的耐高温性能较差的问题
[0013]与现有技术相比，本实用新型的有益效果是：该耐高温安规电容通过安装有壳体和电容芯体，电容芯体由复合介质卷绕而成，复合介质由聚酰亚胺薄膜以及纳米陶瓷颗粒复合而成，聚酰亚胺薄膜具有优异的耐高温性能，可在高温环境下保持稳定的物理和化学性质，同时具备良好的机械性能和电气绝缘性能，纳米陶瓷颗粒具有高导热性和高击穿强度，使得电容芯体产生的热量能够更快速地传导出去，纳米陶瓷颗粒均匀分散在聚酰亚胺薄膜中，二者复合后，能进一步提高电容芯体的耐高温性能、热导率以及击穿强度，使该安规电容能在更高温度、更恶劣的环境中稳定工作，该复合介质与电极紧密贴合并卷绕，构成电容芯体，电极采用高纯度铜箔制成且表面设有抗氧化涂层，以提高电极在高温环境下的稳定性和导电性，确保电荷的有效存储和传输。
Smart Images
Figure CN224841527U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, specifically a high-temperature resistant safety capacitor. Background Technology
[0002] Safety capacitors are capacitors that comply with safety standards, generally referring to film capacitors and ceramic capacitors. Even if they malfunction in a circuit, they will not cause electric shock to the human body and will not endanger personal safety. Safety capacitors play a vital role in various electronic devices, and their safety and stability are directly related to the normal operation of the equipment and the safety of the user.
[0003] Existing safety capacitors generally consist of a dielectric, electrodes, a casing, a package, and leads. The dielectric is often a single dielectric (such as polypropylene film or ceramic). In some special environments, such as high-temperature environments, existing safety capacitors are prone to problems such as capacitance decay and insulation degradation, which may even lead to safety accidents. Therefore, a high-temperature resistant safety capacitor is needed. Utility Model Content
[0004] The purpose of this invention is to provide a high-temperature resistant safety capacitor to solve the problem of poor high-temperature resistance mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature safety capacitor, comprising a shell, a capacitor core, an insulating encapsulation material, and leads. The capacitor core is disposed at the center of the shell, and leads are disposed on both sides of the capacitor core. The bottom ends of the leads extend to the outside of the shell. The shell and the capacitor core are encapsulated by an insulating encapsulation material. The capacitor core is formed by interleaving composite dielectric and electrodes. The composite dielectric includes a polyimide film and nano-ceramic particles, and the nano-ceramic particles are uniformly disposed on the surface of the polyimide film.
[0006] As a further technical solution of this utility model, heat dissipation holes are evenly distributed on both sides of the shell, and the heat dissipation holes are evenly spaced.
[0007] As a further technical solution of this utility model, heat dissipation fins are evenly arranged on both sides of the capacitor core, and one end of each heat dissipation fin extends to the outside of the shell. The side of the heat dissipation fin closest to the capacitor core is connected to the capacitor core through thermally conductive silicone grease.
[0008] As a further technical solution of this utility model, a sealing gasket is provided at the connection between the heat dissipation fins and the shell, and the heat dissipation fins are all made of copper alloy.
[0009] As a further technical solution of this utility model, the insulating encapsulation material includes epoxy resin material and alumina particles, and the alumina particles are uniformly dispersed in the epoxy resin material.
[0010] As a further technical solution of this utility model, the shell includes an inner layer and an outer layer, wherein the inner layer is made of ceramic fiber material and the outer layer is made of aerogel material.
[0011] As a further technical solution of this utility model, a vacuum interlayer is provided between the inner layer and the outer layer, and support columns are distributed in the vacuum interlayer, all of which are made of high-temperature resistant ceramic material.
[0012] As a further technical solution of this utility model, the electrode is made of copper foil, and an anti-oxidation coating is deposited on the surface of the electrode, the anti-oxidation coating being a titanium nitride coating.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-temperature safety capacitor consists of a shell and a capacitor core. The capacitor core is made of a composite dielectric, which is composed of a polyimide film and nano-ceramic particles. The polyimide film has excellent high-temperature resistance and can maintain stable physical and chemical properties in high-temperature environments, while also possessing good mechanical and electrical insulation properties. The nano-ceramic particles have high thermal conductivity and high breakdown strength, allowing the heat generated by the capacitor core to be conducted away more quickly. The nano-ceramic particles are uniformly dispersed in the polyimide film. After the two are combined, the high-temperature resistance, thermal conductivity, and breakdown strength of the capacitor core can be further improved, enabling the safety capacitor to work stably in higher temperatures and harsher environments. The composite dielectric is tightly attached to and wound with the electrodes to form the capacitor core. The electrodes are made of high-purity copper foil with an anti-oxidation coating on the surface to improve the stability and conductivity of the electrodes in high-temperature environments, ensuring effective charge storage and transmission. Attached Figure Description
[0014] 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.
[0015] Figure 1 This is a frontal cross-sectional view of the present invention.
[0016] Figure 2 This is a schematic diagram of the capacitor core structure of this utility model;
[0017] Figure 3For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;
[0018] Figure 4 For the present utility model Figure 1 Enlarged structural diagram at point B;
[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the shell sidewall of this utility model.
[0020] In the diagram: 1. Housing; 2. Capacitor core; 3. Insulating encapsulation material; 4. Heat dissipation fins; 5. Leads; 6. Composite dielectric; 7. Nano-ceramic particles; 8. Electrode; 9. Thermal grease; 10. Sealing gasket; 11. Epoxy resin; 12. Alumina particles; 13. Heat dissipation holes; 14. Inner layer; 15. Outer layer; 16. Vacuum interlayer; 17. Support pillar; 18. Antioxidant coating; 19. Polyimide film. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0022] Please see Figure 1-5 The present invention provides an embodiment of a high-temperature safety capacitor, comprising a housing 1, a capacitor core 2, an insulating encapsulation material 3, and pins 5. The capacitor core 2 is disposed in the center of the housing 1, and pins 5 are disposed on both sides of the capacitor core 2. The bottom ends of the pins 5 extend to the outside of the housing 1 for connecting to an external circuit.
[0023] Furthermore, the interior of the casing 1 and the capacitor core 2 are encapsulated by an insulating encapsulation material 3, which includes epoxy resin material 11 and alumina particles 12, with the alumina particles 12 uniformly dispersed within the epoxy resin material 11.
[0024] The epoxy resin material 11 has good insulation and adhesion properties, which can firmly encapsulate the capacitor core 2 in the shell 1, and at the same time play an electrical insulation role to prevent leakage. The addition of alumina particles 12 improves the high temperature resistance and thermal conductivity of the insulating encapsulation material 3, which helps the capacitor to work stably in high temperature environment and conduct heat.
[0025] The capacitor core 2 is formed by interleaving composite dielectric 6 and electrode 8, and the composite dielectric 6 includes polyimide film 19 and nano-ceramic particles 7, with nano-ceramic particles 7 uniformly disposed on the surface of polyimide film 19.
[0026] Nano-ceramic particles 7 are uniformly dispersed in an organic solvent to form a suspension. The suspension is then uniformly coated on the surface of a polyimide film 19 using a solution coating method. After drying, hot pressing and other processes, the nano-ceramic particles 7 and the polyimide film 19 are tightly bonded together to form a composite medium 6.
[0027] Polyimide film 19 has excellent high temperature resistance and can maintain stable physical and chemical properties in high temperature environments. It also has good mechanical and electrical insulation properties, providing a basic guarantee for the stable operation of capacitors in high temperature environments.
[0028] The nano-ceramic particles 7 have high thermal conductivity and high breakdown strength. When the capacitor core 2 is working, it generates heat, and the nano-ceramic particles 7 can conduct the heat away more quickly to prevent local overheating.
[0029] Nano-ceramic particles 7 are uniformly dispersed in polyimide film 19. After the two are combined, the high temperature resistance, thermal conductivity and breakdown strength of composite dielectric 6 are further improved, enabling the safety capacitor to work stably in higher temperature and harsher environments.
[0030] Electrode 8 is made of copper foil, and an anti-oxidation coating 18 is deposited on the surface of electrode 8. The anti-oxidation coating 18 is a titanium nitride coating, which improves the stability and conductivity of electrode 8 in high-temperature environments and ensures effective storage and transmission of charge.
[0031] Heat dissipation fins 4 are evenly arranged on both sides of the capacitor core 2, and one end of each heat dissipation fin 4 extends to the outside of the shell 1. The side of the heat dissipation fin 4 close to the capacitor core 2 is connected to the capacitor core 2 through thermal grease 9. The heat dissipation fins 4 are all made of copper alloy.
[0032] When working in a high-temperature environment, the capacitor core 2 generates heat due to charge storage and transmission. Thanks to the high thermal conductivity of the nano-ceramic particles 7, the heat generated by the capacitor core 2 is quickly conducted to the heat dissipation fins 4 on both sides. The side of the heat dissipation fins 4 closest to the capacitor core 2 is connected to the capacitor core 2 through thermal grease 9 to enhance the heat conduction efficiency.
[0033] A sealing gasket 10 is provided at the connection between the heat dissipation fin 4 and the shell 1 to ensure airtightness. At the same time, the heat dissipation fin 4 is made of copper alloy, which has good thermal conductivity and can accelerate the dissipation of heat to the external environment.
[0034] The shell 1 has heat dissipation holes 13 evenly distributed on both sides, and the heat dissipation holes 13 are evenly spaced to improve the heat dissipation effect;
[0035] The shell 1 includes an inner layer 14 and an outer layer 15. The inner layer 14 is made of ceramic fiber material, which plays the main role in heat insulation. The outer layer 15 is made of aerogel material, which has extremely low thermal conductivity and can further block the transfer of external heat.
[0036] A vacuum interlayer 16 is provided between the inner layer 14 and the outer layer 15, and support columns 17 are distributed in the vacuum interlayer 16. The support columns 17 are all made of high-temperature resistant ceramic material.
[0037] The vacuum environment can effectively prevent heat conduction and further enhance the heat insulation effect. Support columns 17 are distributed in the vacuum interlayer 16. The support columns 17 are made of high temperature resistant ceramic material and play a role in supporting the inner layer 14 and the outer layer 15 and maintaining the structural stability of the shell 1.
[0038] Working Principle: In use, the high-temperature safety capacitor of this application mainly consists of a shell 1, a capacitor core 2, an insulating encapsulation material 3, and leads 5. The capacitor core 2 is located in the center inside the shell 1, with leads 5 extending to the outside of the shell 1 on both sides for connecting to external circuits. The interior of the shell 1 and the capacitor core 2 are encapsulated by the insulating encapsulation material 3, which provides insulation and protection. The insulating encapsulation material 3 includes epoxy resin material 11 and alumina particles 12. The alumina particles 12 are uniformly dispersed within the epoxy resin material 11. The epoxy resin material 11 has good insulation and adhesion properties, which can firmly encapsulate the capacitor core 2 within the shell 1, while also providing electrical insulation to prevent leakage. The addition of alumina particles 12 improves the insulation encapsulation. The high-temperature resistance and thermal conductivity of material 3 contribute to the stable operation of the capacitor and the conduction of heat in high-temperature environments. The capacitor core 2 is formed by interleaving composite dielectric 6 and electrodes 8. Composite dielectric 6 is a key component, consisting of polyimide film 19 and nano-ceramic particles 7. The nano-ceramic particles 7 are uniformly dispersed in an organic solvent to form a suspension. The suspension is then uniformly coated onto the surface of polyimide film 19 using a solution coating method. After drying, hot pressing, and other processes, the nano-ceramic particles 7 and polyimide film 19 are tightly bonded together to form composite dielectric 6. Polyimide film 19 has excellent high-temperature resistance, maintaining stable physical and chemical properties in high-temperature environments. It also possesses good mechanical and electrical insulation properties, ensuring the capacitor operates stably at high temperatures. The nano-ceramic particles 7 provide a fundamental guarantee for stable operation in low-temperature environments. These particles possess high thermal conductivity and high breakdown strength. When the capacitor core 2 generates heat during operation, the nano-ceramic particles 7 can conduct the heat away more quickly, preventing localized overheating. Furthermore, the nano-ceramic particles 7 are uniformly dispersed in the polyimide film 19. The composite of these two materials further improves the high-temperature resistance, thermal conductivity, and breakdown strength of the composite dielectric 6, enabling the safety capacitor to operate stably in higher temperatures and harsher environments. The composite dielectric 6 is tightly bonded to the oxidation-resistant electrode 8, and assembled and wound according to design requirements to form the capacitor core 2. When operating in high-temperature environments, the capacitor core 2 generates heat due to charge storage and transfer. Thanks to the high thermal conductivity of the nano-ceramic particles 7... The heat generated by the capacitor core 2 is rapidly conducted to the heat dissipation fins 4 on both sides. The side of the heat dissipation fins 4 closest to the capacitor core 2 is connected to the capacitor core 2 via thermally conductive silicone grease 9, enhancing heat conduction efficiency. A sealing gasket 10 is provided at the connection between the heat dissipation fins 4 and the shell 1 to ensure airtightness. The heat dissipation fins 4 are made of copper alloy, which has excellent thermal conductivity, accelerating heat dissipation to the external environment. Furthermore, the shell 1 includes an inner layer 14 and an outer layer 15. The inner layer 14 is made of ceramic fiber material, providing primary heat insulation, while the outer layer 15 is made of aerogel material with extremely low thermal conductivity, further blocking external heat transfer. A vacuum interlayer 16 is provided between the inner layer 14 and the outer layer 15; the vacuum environment effectively prevents heat conduction, further enhancing the heat insulation effect.Support columns 17, made of high-temperature resistant ceramic material, are distributed within the vacuum interlayer 16. These columns support the inner layer 14 and the outer layer 15, maintaining the structural stability of the shell 1.
[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A high-temperature resistant safety capacitor, characterized in that, The device includes a housing (1), a capacitor core (2), an insulating encapsulation material (3), and pins (5). The capacitor core (2) is located in the center of the housing (1), and pins (5) are located on both sides of the capacitor core (2). The bottom ends of the pins (5) extend to the outside of the housing (1). The housing (1) and the capacitor core (2) are encapsulated by the insulating encapsulation material (3). The capacitor core (2) is formed by interleaving a composite medium (6) and electrodes (8). The composite medium (6) includes a polyimide film (19) and nano-ceramic particles (7). The nano-ceramic particles (7) are uniformly disposed on the surface of the polyimide film (19).
2. The high-temperature resistant safety capacitor according to claim 1, characterized in that: The shell (1) has heat dissipation holes (13) evenly distributed on both sides, and the heat dissipation holes (13) are evenly spaced.
3. The high-temperature resistant safety capacitor according to claim 1, characterized in that: Heat dissipation fins (4) are evenly arranged on both sides of the capacitor core (2), and one end of each heat dissipation fin (4) extends to the outside of the shell (1). The side of the heat dissipation fin (4) close to the capacitor core (2) is connected to the capacitor core (2) through thermal grease (9).
4. A high-temperature resistant safety capacitor according to claim 2, characterized in that: A sealing gasket (10) is provided at the connection between the heat dissipation fins (4) and the shell (1), and the heat dissipation fins (4) are all made of copper alloy.
5. A high-temperature resistant safety capacitor according to claim 1, characterized in that: The insulating encapsulation material (3) includes epoxy resin material (11) and alumina particles (12), and the alumina particles (12) are uniformly dispersed in the epoxy resin material (11).
6. A high-temperature resistant safety capacitor according to claim 1, characterized in that: The shell (1) includes an inner layer (14) and an outer layer (15), wherein the inner layer (14) is made of ceramic fiber material and the outer layer (15) is made of aerogel material.
7. A high-temperature resistant safety capacitor according to claim 6, characterized in that: A vacuum interlayer (16) is provided between the inner layer (14) and the outer layer (15), and support columns (17) are distributed in the vacuum interlayer (16), all of which are made of high-temperature resistant ceramic material.
8. A high-temperature resistant safety capacitor according to claim 1, characterized in that: The electrode (8) is made of copper foil, and an antioxidant coating (18) is deposited on the surface of the electrode (8), which is a titanium nitride coating.