Thin film capacitor

Abstract

The application relates to a thin-film capacitor and relates to the technical field of capacitors. The application aims to solve the problems of complex production process and high cost of the thin-film capacitor. The thin-film capacitor comprises a shell, a capacitor core, two terminal pieces and two conductor connecting pieces. The capacitor core is a thin-film capacitor structure and is arranged in the shell, and the terminal pieces are arranged at one end of the shell. The conductor connecting pieces are located in the shell, one conductor connecting piece connects one pole of the capacitor core and one terminal piece, and the other conductor connecting piece connects the other pole of the capacitor core and the other terminal piece. The terminal pieces and the capacitor core are connected and fixed with the conductor connecting pieces through ultrasonic wave connecting structures.

Description

Technical Field

[0001] This application relates to the field of capacitor technology, and more particularly to a thin-film capacitor. Background Technology

[0002] As a common component in electronic devices, film capacitors typically use metal foil or metallized film as electrode materials, combined with plastic film dielectrics such as polyethylene terephthalate and polypropylene, and are made into capacitor cores through a winding process, followed by encapsulation of the capacitor cores.

[0003] During the packaging process, the electrical connection between the electrodes of the capacitor core and the terminals on the outside of the casing needs to be handled by soldering. Since soldering is mostly done manually, the production process is quite difficult, and it also generates harmful gases and waste, thus affecting the production speed and increasing production costs. Utility Model Content

[0004] This application provides a thin-film capacitor to solve the problems of complex manufacturing processes and high costs associated with thin-film capacitors.

[0005] In a first aspect, some embodiments of this application provide a thin-film capacitor, including a housing, a capacitor core, two terminals, and two conductor connectors. The capacitor core is a thin-film capacitor structure disposed within the housing, and the terminals are disposed at one end of the housing. The conductor connectors are located within the housing; one conductor connector connects one electrode of the capacitor core to one of the terminals, and the other conductor connector connects the other electrode of the capacitor core to the other terminal. The terminals and the capacitor core are connected and fixed to the conductor connectors via an ultrasonic connection structure.

[0006] In one alternative embodiment, the conductor connectors and terminals are made of aluminum substrate.

[0007] In one alternative embodiment, the conductor connector is a sheet-like structure, and at least one side or opposite sides of one end of the conductor connector are provided with corrugated grooves.

[0008] In one alternative embodiment, the thickness of the sheet structure is 0.53-0.5 mm, and the width of the sheet structure is 14-18 mm.

[0009] In one alternative embodiment, the capacitor core is an aluminum electrolytic capacitor structure.

[0010] In one alternative implementation, the capacitor core is a wound structure or a stacked structure.

[0011] In one optional embodiment, the terminal piece has a positioning protrusion at one end for connecting to the conductor connector, and the conductor connector has a positioning hole corresponding to the positioning protrusion, with the positioning hole and the positioning protrusion being inserted and adapted.

[0012] In one optional embodiment, the film capacitor includes a terminal support disposed within a housing, with two terminals connected to and spaced apart from the terminal support. The housing has two terminal holes, with one terminal hole being inserted into and fitted into the terminal hole. One end of the terminal hole is inserted into the terminal hole, and the other end of the terminal hole is located within the housing and connected to a conductor connector.

[0013] In one optional embodiment, the two poles of the capacitor core are located at both ends of the capacitor core along a first direction, and the film capacitor includes a first insulating member and a second insulating member. The first insulating member is located within a housing. Along the first direction, one conductor connector is located between the terminal and the capacitor core, and the first insulating member is provided between the other terminal and the capacitor core. The end of the capacitor core away from the terminal support along the first direction is inserted into the second insulating member.

[0014] In one alternative embodiment, the housing includes a housing body and an insulating cover. At least the capacitor core, conductor connectors, and terminal supports are disposed within the housing body. The insulating cover is detachably connected to the housing body and encloses the internal space of the housing body; the insulating cover has terminal holes.

[0015] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0016] A capacitor core is an energy storage element formed by winding or stacking metallized thin films, with its electrodes led out through metal layers. Terminals are conductive components that connect to external circuits. Conductor connectors are metal cables or strips that connect the capacitor core and the terminals. An ultrasonic connection structure refers to a stable connection structure formed by high-frequency vibration causing plastic deformation and atomic diffusion between two metal interfaces.

[0017] Thus, the capacitor core is encapsulated within a housing, with its two electrodes extending to the ends of the housing via conductor connectors to connect to terminals. During assembly, one end of the conductor connector is ultrasonically welded to the metal electrodes of the capacitor core to form a stable connection structure, while the other end is connected to the terminals using the same process. During welding, high-frequency vibration causes plastic flow and atomic diffusion at the contact surface of the two metal components, resulting in atomic-level bonding after the surface oxide layer is removed, thus forming a stable connection structure. This connection method eliminates the need for solder, operates at a lower temperature during the connection process, and produces components with high connection strength. Furthermore, ultrasonic welding offers a high level of automation, avoiding the complex manual operations required by traditional soldering. It simplifies the production process, improves the automation level of film capacitor manufacturing, eliminates solder consumption, and produces no harmful gases or waste requiring treatment, thereby reducing the production cost of film capacitors.

[0018] Furthermore, it should be emphasized that the connection strength between two metal components connected by the ultrasonic connection structure is close to that of the base material, and there is almost no additional resistance at the connection point, which is beneficial to improving the service life and product performance of film capacitors. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 A front view of a thin-film capacitor provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 The diagram shows an internal structure of a thin-film capacitor.

[0024] Figure 3 for Figure 1 The diagram shows the exploded structure of a thin-film capacitor.

[0025] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0026] Figure 5 for Figure 2 A top view of the thin-film capacitor shown;

[0027] Figure 6 for Figure 3 An exploded structural diagram of the terminal component and conductor connector shown in the figure;

[0028] Figure 7 for Figure 5 A cross-sectional view along line BB.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Housing; 11. Housing body; 12. Insulating cover; 20. Capacitor core; 30. Terminal piece; 31. Positioning protrusion; 40. Conductor connector; 41. Corrugated groove; 42. Positioning hole; 50. Terminal bracket; 70. First insulating component; 80. Second insulating component. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following provides numerous different embodiments or examples for implementing various structures of this application. To simplify this application, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0033] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0034] As a common component in electronic devices, film capacitors typically use metal foil or metallized film as electrode materials, combined with plastic film dielectrics such as polyethylene terephthalate and polypropylene, and are made into capacitor cores through a winding process, followed by encapsulation of the capacitor cores.

[0035] During the packaging process, the electrical connection between the electrodes of the capacitor core and the terminals on the outside of the casing needs to be handled by soldering. Since soldering is mostly done manually, the production process is quite difficult, and it also generates harmful gases and waste, thus affecting the production speed and increasing production costs.

[0036] Based on this, please refer to Figures 1 to 7 This application provides a thin-film capacitor to solve the problems of complex manufacturing processes and high costs associated with thin-film capacitors.

[0037] like Figure 1 and Figure 2 As shown, the film capacitor includes a housing 10, a capacitor core 20, two terminal pieces 30, and two conductor connectors 40. The capacitor core 20 is a film capacitor structure and is disposed within the housing 10. The terminal pieces 30 are disposed at one end of the housing 10. The conductor connectors 40 are located within the housing 10, as shown... Figure 3 As shown, one conductor connector 40 connects one pole of the capacitor core 20 to one terminal 30, and another conductor connector 40 connects the other pole of the capacitor core 20 to another terminal 30. The terminal 30 and the capacitor core 20 are connected and fixed to the conductor connector 40 via an ultrasonic connection structure.

[0038] The housing 10 refers to the protective container that houses the capacitor core 20 and the connection structure. The material of the housing 10 can be metal or plastic, or the housing 10 can be partly metal and partly insulating plastic. There are no restrictions on this.

[0039] The capacitor core 20 refers to an energy storage element formed by winding or stacking metallized thin films, with its two electrodes led out through metal layers. The terminal piece 30 refers to a conductive component connected to an external circuit. The conductor connector 40 is a metal cable or strip connecting the capacitor core 20 and the terminal piece 30. An ultrasonic connection structure refers to a stable connection structure formed by high-frequency vibration causing plastic deformation and atomic diffusion between two metal interfaces.

[0040] The capacitor core 20 is encapsulated within the housing 10, with its two electrodes extending to the ends of the housing 10 via conductor connectors 40 to connect to terminal pieces 30. During assembly, one end of the conductor connector 40 is ultrasonically welded to the metal electrodes of the capacitor core 20 to form a stable connection structure, while the other end is connected to the terminal piece 30 using the same process. During welding, high-frequency vibration causes plastic flow and atomic diffusion at the contact surface of the two metal components, resulting in atomic-level bonding after the surface oxide layer is removed, thus forming a stable connection structure. This connection method eliminates the need for solder, operates at a lower temperature during the connection process, and provides high connection strength to the connected components. Furthermore, the ultrasonic welding process offers a high level of automation, avoiding the complex manual operations required by traditional soldering. This simplifies the production process, improves the automation level of film capacitor production, eliminates solder consumption, and avoids the generation of harmful gases and waste requiring treatment, thereby reducing the production cost of film capacitors.

[0041] Furthermore, it should be emphasized that the connection strength between two metal components connected by the ultrasonic connection structure is close to that of the base material, and there is almost no additional resistance at the connection point, which is beneficial to improving the service life and product performance of film capacitors.

[0042] Furthermore, the conductor connector 40 can be made of an aluminum substrate. The terminal component 30 can also be made of an aluminum substrate. An aluminum substrate refers to a material made of aluminum or an aluminum alloy, such as 1060 aluminum or 3003 aluminum alloy.

[0043] By using aluminum as the substrate for the conductor connector 40 and the terminal 30, the material cost of the conductor connector 40 and the terminal 30 is significantly reduced compared to traditional solutions using brass, copper, or tin-plated copper strips, while still maintaining conductivity. Furthermore, since the density of aluminum is much lower than that of copper, the overall weight of the two components and the film capacitor can be reduced while maintaining the same conductivity, which is beneficial for lightweight component design.

[0044] The conductor connector 40 can be an aluminum cable.

[0045] Or, such as Figure 4 and Figure 6 As shown, the conductor connector 40 can also be configured as a sheet structure. Based on this, at least one side or opposite sides of one end of the conductor connector 40 are provided with corrugated grooves 41 to increase the heat dissipation contact area at the connection position of the conductor connector 40 end.

[0046] Within the housing 10, by setting the conductor connector 40 as a thin sheet structure, wire threading can be performed within a small gap while ensuring the current conduction effect. Alternatively, the gap size inside the housing 10 can be compressed, which is beneficial for the miniaturization design of the film capacitor.

[0047] In this design, at one end or both ends of the sheet-like conductor connector 40, a continuous convex-concave structure can be formed on one side or both sides to create a corrugated groove 41. Specifically, this can be achieved by forming a regular wavy pattern on the surface of the aluminum strip through rolling or stamping processes. Since the two conductive components are prone to heat generation at the contact connection point, the structure of the corrugated groove 41 can increase the surface area of ​​the conductor connector 40 at that location, which is beneficial for sufficient contact with air to dissipate heat.

[0048] Taking a U-shaped structure with a vertical connection for the conductor connector 40 as an example, along the first direction Y, if the conductor connector 40 is used to connect the capacitor core 20 and the terminal piece 30 on its outer sides that are far apart at both ends, then a corrugated groove 41 can be provided on the inner sides that are close to each other at both ends of the conductor connector 40. Conversely, if the conductor connector 40 is used to connect the terminal piece 30 and the capacitor core 20 on one of its outer sides and one of its inner sides at both ends, then a corrugated groove 41 can be provided on the inner and outer sides of the opposite sides. Alternatively, a corrugated groove 41 can be provided on both outer sides and both inner sides at both ends of the conductor connector 40, without limitation.

[0049] For example, such as Figure 4 and Figure 6 As shown, this is especially true at the end of the conductor connector 40 located at the terminal 30. Since the terminal 30 is used to connect to external circuits, it has a relatively large connection resistance, meaning that the terminal 30 is prone to overheating during use. This solution addresses this by providing a corrugated groove 41 at the end of the conductor connector 40 located at the terminal 30. This increases the surface area of ​​the conductor connector 40 at that end, thereby assisting in rapid heat dissipation from the terminal 30 and enabling the film capacitor to operate continuously and stably.

[0050] Through the above technical solution, this application can achieve a reliable solderless connection between conductor connectors and terminals, solving the problems of incomplete soldering and environmental pollution caused by traditional soldering processes. The aluminum strip structure significantly reduces material costs while ensuring conductivity, and the corrugated groove structure improves the stability of the welding interface by increasing the contact area, meeting the industrial production requirements for low cost and high reliability.

[0051] The thickness of the sheet-like conductor connector 40 is 0.5-0.5 mm, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm. The width of the sheet-like conductor connector 40 is 14-18 mm, such as 14 mm, 15 mm, 16 mm, 17 mm, or 18 mm.

[0052] A sheet structure with a thickness of 0.5-0.5mm can balance material cost and conductivity efficiency, avoiding insufficient mechanical strength and reduced conductivity due to excessive thinness, while also avoiding increased weight and cost due to excessive thickness, and avoiding impact on the internal space layout of the housing 10. A sheet structure with a width of 14-18mm can adapt to different current carrying requirements, while providing sufficient contact area for ultrasonic welding and heat dissipation of the corrugated groove 41, ensuring connection stability and heat dissipation effect.

[0053] The capacitor core 20 is an aluminum electrolytic capacitor. An aluminum electrolytic capacitor is a polarized capacitor that uses aluminum foil as the positive electrode and an electrolyte / solid electrolyte as the negative electrode. It achieves high capacity and high voltage withstand capability through an extremely thin aluminum oxide dielectric layer (Al2O3). It has the advantages of large capacity and low cost, while also possessing low-frequency filtering characteristics.

[0054] Furthermore, since the conductor connector 40 is made of aluminum substrate, and the capacitor core 20 is made of aluminum electrolytic capacitor, when the conductor connector 40 is connected to the electrode of the capacitor core 20, the two have better compatibility and connection strength when connected by ultrasonic waves because both the electrode material and the material of the conductor connector 40 are made of aluminum.

[0055] The capacitor core 20 can be a wound structure. A wound structure refers to a cylindrical core formed by axially winding metallized films after lamination. Specifically, it can be achieved using a process of alternating layers of polypropylene film and metal foil followed by winding, suitable for applications requiring high capacitance. Due to the maturity of the winding process and its high degree of automation, it is suitable for large-scale production. High capacitance can be achieved by extending the film length. Because the wound structure is compact, it has strong resistance to vibration and impact and good mechanical stability. Furthermore, localized breakdown of the metallized electrodes in a wound structure can self-heal, resulting in good reliability.

[0056] Alternatively, the capacitor core 20 can be a laminated structure. A laminated structure refers to a flat core formed by stacking metallized films and pressing them along a planar direction. Specifically, it can be achieved using a hot-pressing process that alternates between stacking polyester film and metal foil, suitable for applications requiring compact space layout. Due to the short interlayer current paths in a laminated structure, it exhibits excellent high-frequency performance, making it suitable for high-frequency switching circuits. Laminated structures also feature structural symmetry and uniform interlayer electric fields. The former results in minimal parasitic inductance and strong suppression of high-frequency oscillations; the latter allows for the design of higher rated voltages. Furthermore, the interlayer gaps in a laminated structure facilitate heat dissipation, reducing the risk of thermal failure. The hollow, unwound structure of a laminated structure results in a larger capacitance per unit volume.

[0057] In summary, the wound structure forms a dense charge storage region through the continuous winding of the thin film layer and electrode material, simplifying the manufacturing process while maintaining the basic performance of the thin film capacitor. The stacked structure achieves an alternating distribution of electrodes and dielectric layers through planar stacking, realizing a compact arrangement of the capacitor core 20 within the limited space of the housing 10. The choice can be flexible according to actual needs and is not limited thereto.

[0058] In some embodiments, such as Figure 4 and Figure 6 As shown, the terminal piece 30 is provided with a positioning protrusion 31 at one end for connecting the conductor connector 40, and the conductor connector 40 is provided with a positioning hole 42 corresponding to the positioning protrusion 31. The positioning hole 42 is inserted and adapted to the positioning protrusion 31.

[0059] The positioning protrusion 31 refers to the protruding structure provided at the connection end of the terminal piece 30. It can be implemented using a cylindrical, square, or irregularly shaped boss structure. Its function is to provide a physical positioning reference for the conductor connector 40, preventing relative displacement between the terminal piece 30 and the conductor connector 40 during welding. The positioning hole 42 refers to a through hole or blind hole opened on the conductor connector 40. It can be formed by stamping or drilling processes. Its shape matches the outer contour of the positioning protrusion 31, achieving pre-positioning through insertion and ensuring the positional accuracy of the components before ultrasonic welding.

[0060] During assembly, the terminal 30 and conductor connector 40 are first inserted by aligning the positioning hole 42 of the conductor connector 40 with the positioning protrusion 31 of the terminal 30 to achieve initial fixation. At this point, the welding area of ​​the conductor connector 40 is fully in contact with the welding surface of the terminal 30. Subsequently, the two are connected by ultrasonic welding. Because the engagement between the positioning protrusion 31 and the positioning hole 42 restricts the degree of freedom of movement between the two components, no additional clamps are needed during the welding process to maintain the stability of the component position and avoid misalignment caused by vibration or pressure.

[0061] The above technical solution solves the problem of difficult alignment between terminal 30 and conductor connector 40 during the welding process of traditional film capacitors, reduces the complexity of manual adjustment, and improves the consistency of welding positions. The insertion and engagement of the positioning protrusion 31 and the positioning hole 42 provides a stable reference surface for ultrasonic welding, avoiding incomplete welding or insufficient welding strength caused by component misalignment, thereby improving the electrical connection reliability of the capacitor.

[0062] To facilitate the support of terminal piece 30, such as Figure 2 and Figure 3 As shown, the film capacitor includes a terminal support 50, which is disposed within the housing 10. Two terminal pieces 30 are connected to the terminal support 50 and spaced apart. The housing 10 has two terminal holes, and one terminal piece 30 is inserted into one terminal hole. One end of the terminal piece 30 is inserted into the terminal hole, and the other end of the terminal piece 30 is located inside the housing 10 and connected to the conductor connector 40.

[0063] Terminal bracket 50 refers to the support structure used to fix terminal piece 30. It can be made of injection-molded insulating material. Its function is to provide a stable mounting reference for terminal piece 30 and prevent displacement during assembly.

[0064] Terminal holes refer to through-hole structures on the housing 10 used for positioning terminal pieces 30. Specifically, they can be circular or square holes that match the cross-sectional shape of the terminal piece 30. Their function is to achieve quick positioning of the terminal piece 30 and the housing 10 through mechanical insertion, and to allow one end of the terminal piece 30 to protrude outside the housing 10 for easy connection to other electrical components.

[0065] The interval distribution refers to the fact that the two terminal pieces 30 maintain a preset distance on the terminal bracket 50. Specifically, this can be achieved by setting a partition rib or a slot structure on the terminal bracket 50. Its function is to ensure electrical isolation between the two poles and prevent the risk of short circuit.

[0066] For example, the terminal bracket 50 is injection molded to match the internal contour of the housing 10, and two terminal pieces 30 are embedded in the fixing groove of the terminal bracket 50, forming a laterally spaced arrangement. One end of the terminal piece 30 extends out of the housing 10 to form a wiring terminal, and the other end is fixed to the conductor connector 40 by ultrasonic welding. The terminal hole opened in the side wall or top wall of the housing 10 can be slightly smaller than the outer diameter of the terminal piece 30, and an interference fit is used to achieve sealing and prevent detachment. During assembly, the terminal piece 30 is inserted into the terminal hole from the inside of the housing 10, and the limiting effect of the terminal bracket 50 ensures that the insertion depth is consistent.

[0067] In some embodiments, such as Figure 1 and Figure 3As shown, the housing 10 includes a housing body 11 and an insulating cover 12. At least a capacitor core 20, a conductor connector 40, and a terminal bracket 50 are disposed within the housing body 11. The insulating cover 12 is detachably connected to the housing body 11 and is used to enclose the internal space of the housing body 11. The insulating cover 12 is provided with terminal holes.

[0068] The shell body 11 refers to the main structure that houses the capacitor core 20, conductor connector 40 and terminal bracket 50. Specifically, it can be made of injection-molded insulating material or metal material, such as 3003 aluminum alloy or 6061 aluminum alloy, to provide mechanical support and electrical isolation for the internal components.

[0069] The insulating cover 12 is a closed component that mates with the shell body 11. It can be made of insulating materials such as polypropylene or nylon. It forms a detachable structure with the shell body 11 by means of snap-fit ​​or threaded connection, which facilitates the installation and maintenance of internal components while maintaining airtightness, thereby simplifying the assembly process and reducing maintenance costs.

[0070] Among them, the terminal hole refers to the through hole set on the insulating cover for inserting terminal parts. Specifically, it can be a round hole structure that is interference-fitted with the outer diameter of the terminal part. Its function is to fix the position of the terminal part and prevent it from shifting under vibration.

[0071] like Figure 3 and Figure 7 As shown, the two electrodes of the capacitor core 20 are located at both ends of the capacitor core 20 along the first direction Y. The film capacitor includes a first insulating member 70 and a second insulating member 80. (Combined with...) Figure 5 The first insulating member 70 is located within the housing 10 (such as the housing body 11). Along the first direction Y, one conductor connector 40 is located between the terminal member 30 and the capacitor core 20, and the first insulating member 70 is provided between the other terminal member 30 and the capacitor core 20. One end of the capacitor core 20, away from the terminal support 50, is inserted into the second insulating member 80 along the first direction Y. The second insulating member 80 is at least partially located between the capacitor core 20 and the housing body 11 along the first direction Y. The first direction Y refers to the direction in which the length of the capacitor core 20 extends.

[0072] The first insulating member 70 is an insulating component for the terminal 30 and the capacitor core 20. Since the two terminal 30s are located on the same side of the capacitor core 20, but the polarity of one of the terminal 30s is opposite to that of the capacitor core 20, the first insulating member 70 is provided between them to increase the creepage distance and improve the electrical insulation effect. This prevents short circuits caused by non-target contact between the terminal 30 and the capacitor core 20. The first insulating member 70 can be made of injection-molded epoxy resin or rubber.

[0073] In some specific embodiments, the first insulating member 70 may be configured with an L-shaped cross section, with one part inserted between the terminal member 30 and the capacitor core 20 along the first direction Y, and the other part isolating the conductor connector 40 from the capacitor core 20 which is not the target pole, so as to improve the overall electrical insulation effect and facilitate the overall miniaturization design.

[0074] Taking the end of the capacitor core 20 closest to the terminal 30 along the first direction Y as the upper end and the other end of the capacitor core 20 as the lower end as an example, the second insulating member 80 refers to the insulating and fixing structure that wraps around the lower end of the capacitor core 20. For example, the second insulating member 80 is made of injection-molded epoxy resin or rubber, used to limit the radial displacement of the capacitor core 20 within the housing 10. This also ensures that the housing body 11 and the capacitor core 20 are spaced apart and have an electrical isolation effect.

[0075] The second insulating member 80 can be designed as an annular sleeve with a groove. The lower end of the capacitor core 20 is inserted into the groove, and both are inserted into the housing body 11 together. The axial and radial fixing effect of the second insulating member 80 on the capacitor core 20 can reduce the mechanical stress of the internal structure under vibration environment and improve the reliability of the capacitor under complex working conditions.

[0076] During the assembly of the film capacitor, two conductor connectors 40 are fixedly connected to the two end electrodes of the finished capacitor core 20, and the other ends of the two conductor connectors 40 are fixedly connected to two terminal pieces 30 respectively through a concave-convex fitting structure. Since the two terminal pieces 30 are connected and positioned by the terminal bracket 50, a first insulating member 70 can be set between the terminal bracket 50 and the capacitor core 20, and a part of the first insulating member 70 is located between the radially outer side of the capacitor core 20 and a corresponding conductor connector 40. Then, the end of the capacitor core 20 away from the terminal bracket 50 is inserted into the second insulating member 80, and this end is inserted into the housing body 11. Since the housing body 11 has a positioning groove structure at the opening, the two ends of the terminal bracket 50 are inserted and fitted into the corresponding positioning groove structure to support and position the two terminal pieces 30 at the opening of the housing body 11. Then, the insulating cover 12 is connected to the housing body 11 so that the ends of the two terminal pieces 30 away from the capacitor core 20 pass through the terminal holes on the insulating cover 12 and protrude, which facilitates the connection of other electrical components.

[0077] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also indicate the inclusion of the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0078] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0079] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A thin film capacitor, characterized by, include: Shell (10); The capacitor core (20) is a thin-film capacitor structure and is disposed inside the housing (10); Two terminal pieces (30) are disposed at one end of the housing (10); And two conductor connectors (40), which are located inside the housing (10), one of the conductor connectors (40) connecting one of the poles of the capacitor core (20) and one of the terminal pieces (30), and the other conductor connector (40) connecting the other pole of the capacitor core (20) and the other terminal piece (30); The terminal piece (30) and the capacitor core (20) are connected and fixed to the conductor connector (40) through an ultrasonic connection structure.

2. The thin film capacitor of claim 1, wherein The conductor connector (40) and the terminal (30) are made of aluminum substrate.

3. The thin film capacitor of claim 1, wherein The conductor connector (40) has a sheet-like structure, and at least one end of the conductor connector (40) has a corrugated groove (41) on one side or opposite sides.

4. The thin film capacitor of claim 3, wherein The thickness of the sheet structure is 0.3-0.5 mm, and the width of the sheet structure is 14-18 mm.

5. The thin film capacitor of claim 1, wherein The capacitor core (20) is an aluminum electrolytic capacitor structure.

6. The thin film capacitor of claim 1, wherein The capacitor core (20) is a wound structure or a stacked structure.

7. The thin film capacitor of any one of claims 1-6, wherein, The terminal piece (30) is provided with a positioning protrusion (31) at one end for connecting to the conductor connector (40). The conductor connector (40) is provided with a positioning hole (42) corresponding to the positioning protrusion (31). The positioning hole (42) is inserted and adapted to the positioning protrusion (31).

8. The thin film capacitor of any one of claims 1-6, wherein, The thin-film capacitor includes: Terminal bracket (50) is disposed inside the housing (10), and two terminal pieces (30) are connected to the terminal bracket (50) and spaced apart; The housing (10) is provided with two terminal holes. One terminal piece (30) is plugged into and adapted to one of the terminal holes. One end of the terminal piece (30) is inserted into the terminal hole, and the other end of the terminal piece (30) is located inside the housing (10) and connected to the conductor connector (40).

9. The thin film capacitor of claim 8, wherein The two poles of the capacitor core (20) are located at both ends of the capacitor core (20) along a first direction, and the film capacitor includes: A first insulating member (70) is located inside the housing (10); along the first direction, one of the conductor connectors (40) is located between the terminal (30) and the capacitor core (20) along the first direction, and the first insulating member (70) is provided between the other terminal (30) and the capacitor core (20); And a second insulating member (80), wherein one end of the capacitor core (20) away from the terminal bracket (50) along the first direction is inserted into the second insulating member (80).

10. The thin film capacitor of claim 8, wherein The housing (10) includes: The shell body (11) is provided inside at least the capacitor core (20), the conductor connector (40) and the terminal bracket (50); and an insulating cover (12) detachably connected with the case main body (11) for packing an inner space of the case main body (11), the insulating cover (12) being provided with the terminal hole.

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