Special high-temperature-resistant and large-current-resistant resonant thin-film capacitor for new energy field

Abstract

The utility model discloses a high temperature resistant and heavy current resistant resonance film capacitor specially used in the new energy field, which comprises a double-sided metallized film and two polypropylene aluminum films, the upper and lower surfaces of the double-sided metallized film are provided with metal layers, the two polypropylene aluminum films are arranged below the double-sided metallized film, and the metal layers are arranged on the two sides of the double-sided metallized film. The two polypropylene aluminum films adopt a metal layer opposite structure; the high-temperature-resistant and large-current-resistant resonant thin-film capacitor designed by the utility model can meet the requirements of the silicon carbide new energy field on high-temperature resistance and high-frequency large-current resistance, and meanwhile, the size is not increased. The charging time can be greatly shortened, and the charging experience is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a high temperature resistant and high current resistant resonant film capacitor specially used in the new energy field. Background Art

[0002] With the application of silicon carbide in the new energy field, film capacitors have become a shortcoming in temperature resistance, especially the higher the switching frequency of silicon carbide semiconductors, the greater the high-frequency current generated, and the greater the heat generated by the equipment. High-temperature and high-current resonant film capacitors are suitable for high frequencies and large currents, which leads to very high requirements for the internal resistance of film capacitors. At the same time, the heat dissipation capacity of the product needs to be very good. Ordinary resonant capacitors on the market can no longer meet this requirement, and the volume pursued by customers is getting smaller and smaller. Therefore, without increasing the volume, high-temperature and high-current resonant capacitors have strong market competitiveness. The utility model provides a high-temperature and high-current resonant film capacitor specially used in the new energy field. Utility Model Content

[0003] The utility model aims to provide a high temperature resistant and high current resistant resonant film capacitor specially used in the new energy field.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A high temperature resistant and high current resistant resonant film capacitor specially used in the new energy field comprises a double-sided metallized film and two polypropylene aluminum films, wherein the upper and lower surfaces of the double-sided metallized film are provided with metallized layers, which greatly improves the current carrying capacity; the two polypropylene aluminum films are arranged below the double-sided metallized film, and the metallized layers of the two polypropylene aluminum films are arranged relatively to each other, which also greatly reduces the internal resistance of the capacitor and reduces the heat generated under high-frequency current.

[0006] Furthermore, thermally conductive silicone potting is used.

[0007] Furthermore, 70% to 90% of the core height is potted with thermally conductive silicone, and the remaining portion is potted with flame-retardant epoxy glue.

[0008] Furthermore, modified PPS plastic shell packaging is used, and the temperature resistance reaches 260℃-280℃.

[0009] In summary, the utility model has the following beneficial effects: the resonant film capacitor designed by the utility model can effectively meet the requirements of the silicon carbide new energy field for high temperature resistance and high frequency and high current resistance, while not increasing the volume. It can greatly shorten the charging time and provide a better charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a common resonant capacitor metal film structure;

[0011] Figure 2 It is a practical high temperature and high current resistant resonant film capacitor metal film structure;

[0012] Figure 3 It is a common resonant capacitor structure;

[0013] Figure 4 The utility model relates to a resonant film capacitor structure which is resistant to high temperature and large current.

[0014] In the figure, 1. Double-sided metallized film; 2. Polypropylene aluminum film; 3. Polypropylene film; 4. Thermal conductive silicone; 5. Flame retardant epoxy glue; 6. Lead wire; 7. Plastic shell. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] A high temperature and high current resistant resonant film capacitor specially used in the new energy field, such as Figure 2 As shown: it includes a double-sided metallized film 1 and two polypropylene aluminum films 2, the upper and lower surfaces of the double-sided metallized film 1 are both provided with metallized layers, the two polypropylene aluminum films 2 are arranged below the double-sided metallized film 1, and the metallized layers of the two polypropylene aluminum films 2 are arranged opposite to each other.

[0017] Preferably, two polypropylene aluminum films are used. Compared with the existing common photo capacitors, Figure 1 , the polypropylene film 3 is replaced with a polypropylene aluminum film 2, and the metallized layers of the two polypropylene aluminum films 2 are arranged relatively to each other, that is, while the overall external dimensions of the product remain unchanged, the metal layer of a single polypropylene aluminum film is thickened, which can effectively reduce the internal resistance of the product itself without affecting the pressure resistance of the product.

[0018] Furthermore, the DC-LINK film resistant to high ripple current is potted with thermally conductive silicone, preferably with high thermal conductivity silicone, such as SLD-8941 series thermal conductive silicone, to dissipate the heat inside the core more effectively, making it easier to achieve thermal balance inside the core.

[0019] Further, such as Figure 4 As shown, the DC-LINK film with high ripple current resistance is potted with thermally conductive silicone. Compared with the existing ordinary resonant capacitor (reference Figure 3), preferably 70%-90% of the core height is potted with thermal conductive silicone, and the remaining part is potted with flame retardant epoxy glue to ensure the heat dissipation area inside the core, making it easier to achieve thermal balance inside the core. At the same time, the surface glue is flame retardant epoxy glue to ensure the flame retardant performance of the product.

[0020] Furthermore, the DC-LINK film resistant to high ripple current is packaged in a PPS plastic shell, preferably a high-temperature resistant modified PPS plastic shell, such as A490MA50 series modified PPS particles, with a thermal deformation temperature of >260°C. When the heat inside the core is dissipated more effectively, the product temperature rises or the external temperature has no effect on the product, thereby ensuring the integrity of the product.

[0021] The resonant film capacitor designed in this utility model can effectively meet the requirements of the silicon carbide new energy field for high temperature resistance and high frequency and high current resistance, while not increasing the volume. It can greatly shorten the charging time and provide a better charging experience.

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as the modifications are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high temperature and high current resistant resonant film capacitor specially used in the new energy field, characterized by: The invention comprises a double-sided metallized film (1) and two polypropylene aluminum films (2), wherein the upper and lower surfaces of the double-sided metallized film (1) are both provided with metallized layers, the two polypropylene aluminum films (2) are arranged below the double-sided metallized film (1), and the metallized layers of the two polypropylene aluminum films (2) are arranged opposite to each other.

2. According to claim 1, a high temperature and high current resistant resonant film capacitor specially used in the new energy field, characterized in that: Use thermal conductive silicone potting.

3. A high temperature and high current resistant resonant film capacitor specially used in the new energy field according to claim 2, characterized in that: 70%-90% of the core height is potted with thermally conductive silicone and the remaining portion is potted with flame retardant epoxy glue.

4. According to claim 2, a high temperature and high current resistant resonant film capacitor specially used in the new energy field, characterized in that: Adopt modified PPS plastic case packaging.

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