Capacitor capable of being used in multi-load and large-current field
By combining a flat structure with a heat-dissipating metal plate, the problem of heat generation in film capacitors under multiple loads and high current conditions is solved, improving ripple current capability and insulation performance, and achieving a highly reliable capacitor design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-10
AI Technical Summary
In applications with multiple loads and high currents, the increased ripple current of film capacitors leads to increased heat generation, affecting insulation performance and withstand voltage, which may cause capacitor failure or explosion.
The capacitor adopts a flat structure design, which maximizes the overlap area between the gold-plated layer of the internal core and the copper busbar, and embeds a heat dissipation metal plate at the bottom of the casing to enhance heat dissipation.
It improves the output ripple current capability, reduces the internal temperature of the film capacitor, enhances insulation performance and heat dissipation, and improves the reliability of the capacitor.
Smart Images
Figure CN224110141U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of film capacitor, especially relates to a capacitor capable of being used in multi-load and large current field. BACKGROUND
[0002] Film capacitors have the advantages of low equivalent series resistance, low equivalent series inductance, long service life, reliable operation and the like, and are widely applied in the field of vehicle-mounted capacitors. In a vehicle-mounted inverter, a DC bus capacitor plays the role of stabilizing power supply voltage and providing instantaneous energy. With the development of the new energy automobile industry, vehicle-mounted film capacitors have the development trend of integration, large current and high voltage, and a vehicle model with multiple motors requires the ability of vehicle-mounted capacitors to output large ripple current.
[0003] An increase in ripple current will inevitably lead to an increase in the heat generation of the film capacitor, and the increased heat generation will cause the temperature of the film capacitor to rise, which will greatly affect the insulation performance and voltage resistance of the film capacitor, and may even cause the capacitor to fail or even burst. SUMMARY
[0004] To solve the above technical problems, the utility model provides a capacitor capable of being used in multi-load and large current field, which can improve the output ripple current capacity and improve the heat dissipation capacity.
[0005] The technical scheme is as follows: a capacitor capable of being used in multi-load and large current field, which comprises a shell, a capacitor core, an electrode busbar and a potting material, characterized in that the shell is a cuboid plastic shell and is open on one of the two largest surfaces, the capacitor core is composed of a plurality of rows of cores, the electrode busbar is a flat plate, and a heat dissipation metal plate is installed at the bottom of the interior of the shell.
[0006] Further, the electrode busbar comprises a lower electrode busbar, an upper positive electrode busbar and an upper negative electrode busbar, the upper negative electrode busbar is located above the upper positive electrode busbar and is provided with an insulating layer therebetween, the upper negative electrode busbar is connected to the lower electrode busbar, the upper surfaces of the upper positive electrode busbar and the upper negative electrode busbar are each welded with a lead-out electrode, and a notch is formed in the upper negative electrode busbar to allow the lead-out electrode of the upper positive electrode busbar to pass through.
[0007] The upper surfaces of the upper positive electrode busbar and the upper negative electrode busbar are each welded with two rows of lead-out electrodes.
[0008] The capacitor flat structure is designed, the maximum overlapping area of the internal core body gold spraying layer and the copper bar is ensured, the output ripple current capacity of the capacitor is maximally improved, the metal plate is embedded at the bottom of the shell, the temperature inside the film capacitor can be quickly reduced, and the output ripple current capacity of the film capacitor is further increased. BRIEF DESCRIPTION OF DRAWINGS
[0009] Fig. 1 It is a structure schematic view of the utility model;
[0010] Fig. 2 It is a shell and capacitor core, electrode busbar separation state schematic view;
[0011] Fig. 3 It is an explosion view of the utility model. DETAILED DESCRIPTION
[0012] As shown in Figs. 1 to 3 A capacitor capable of being used in the field of multiple loads and large current includes a shell 1, a capacitor core 2, an electrode busbar 3 and a pouring material. The pouring material is made of environment-friendly resin material, is initially in viscous liquid state, has good fluidity and filling property, and is solidified into solid under certain conditions (such as heating or ultraviolet irradiation). The pouring resin material after solidification shapes the film capacitor, facilitates installation and use, simultaneously plays the role of insulation, moisture and humidity resistance, and can also enhance the mechanical strength of the capacitor, improve the vibration resistance, impact resistance and environmental performance. The shell 1 is a cuboid plastic shell and is opened on one of the two largest surfaces. The capacitor core 2 is composed of a plurality of core groups. The core is made of metallized film by winding. The electrode busbar 3 is a flat plate. The inner bottom of the shell 1 is provided with a heat dissipation metal plate 4. The heat dissipation metal plate 4 has good thermal conductivity and mechanical strength, can effectively dissipate heat and provide structural support, and simultaneously enhances the vibration resistance and impact resistance of the capacitor.
[0013] The electrode busbar 3 includes a lower electrode busbar 3-1, an upper positive electrode busbar 3-2 and an upper negative electrode busbar 3-3. The upper negative electrode busbar 3-3 is located above the upper positive electrode busbar 3-2 and is provided with an insulating layer therebetween. The upper negative electrode busbar 3-3 is connected with the lower electrode busbar 3-1. The upper surfaces of the upper positive electrode busbar 3-2 and the upper negative electrode busbar 3-3 are both welded with two rows of lead electrodes. The upper negative electrode busbar is provided with a notch for the lead electrodes of the upper positive electrode busbar to pass through. When the upper positive electrode busbar 3-2 and the upper negative electrode busbar 3-3 are stacked, the notch can allow the lead electrodes to pass through.
[0014] The film capacitor of the present application realizes high capacitance density, excellent electrical performance, good heat dissipation performance and high reliability through the organic combination of a plastic packaging shell, a film capacitor core, an electrode busbar and a pouring resin material. The flat design of the plastic packaging shell facilitates installation and integration, and is suitable for application scenarios with limited space. The design of the metallized film and the electrode busbar reduces the equivalent series resistance (ESR) and the equivalent series inductance (ESL) of the capacitor, and improves the high-frequency performance of the capacitor. It can be applied in the field of new energy vehicles and can be used as a busbar supporting capacitor for a multi-motor system, and has the ability to output large ripple current.
Claims
1. A capacitor which can be used in the field of multi-load and large current, comprising a housing, a capacitor core, an electrode busbar, a potting material, characterized in that, The shell is a cuboid plastic shell and is opened in one of the two largest areas, the capacitor core is composed of a layer of multiple core groups, the electrode busbar is a flat plate, and a heat dissipation metal plate is installed at the bottom of the inside of the shell.
2. A capacitor capable of being used in the field of multi-load and large current according to claim 1, characterized in that, The electrode busbar includes a lower electrode busbar, an upper positive electrode busbar and an upper negative electrode busbar, the upper negative electrode busbar is located above the upper positive electrode busbar and is provided with an insulating layer therebetween, the upper negative electrode busbar is connected with the lower electrode busbar, the upper surfaces of the upper positive electrode busbar and the upper negative electrode busbar are both welded with outgoing electrodes, and the upper negative electrode busbar is provided with a notch for the outgoing electrodes of the upper positive electrode busbar to pass through.
3. A capacitor capable of being used in the field of multi-load and large current according to claim 2, characterized in that, The upper surfaces of the upper positive electrode busbar and the upper negative electrode busbar are both welded with two rows of the outgoing electrodes.