High-power super capacitor
By optimizing the design of high-power supercapacitors, the problems of large size, heavy weight, and low energy density of thin-film capacitors and lithium batteries in high-power DC/DC bidirectional converters have been solved, achieving efficient fast charging and discharging and long-life capacitor performance.
Patent Information
- Application Number
- CN202511873393.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-02-24
AI Technical Summary
Existing thin-film capacitors and lithium batteries suffer from problems such as large size, heavy weight, low energy density, and poor cycle life in high-power DC/DC bidirectional converters.
Design a high-power supercapacitor by combining individual capacitors in series and parallel, optimizing the casing structure, and adding a parallel current sharing circuit. This results in a total weight of less than 1.5 kg for each capacitor, a total volume of 160 mm × 156 mm × 40 mm, a cycle life of 500,000 to 1,000,000 cycles, and an operating voltage range of 150 V to 350 V for compatible DC/DC bidirectional converters.
It enables the efficient use of supercapacitors during high-power charging and discharging, improving weight, volume, cycle life, and power density, and supporting fast charging and discharging.
Smart Images
Figure CN121565697A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of energy storage technology, specifically to a high-power supercapacitor. Background Technology
[0002] With the research on DC / DC bidirectional converter technology, the research on energy storage devices has gradually become an indispensable part of the development of DC / DC bidirectional converters. Bidirectional converters can charge energy storage devices in forward mode, and in reverse mode, energy storage devices can discharge through the bidirectional converter.
[0003] Current energy storage components mainly include thin-film capacitors, lithium batteries, and supercapacitors. However, thin-film capacitors and lithium batteries are characterized by large size, heavy weight, low energy density, and poor cycle life. In order to meet the fast charging and discharging requirements of high-power DC / DC bidirectional converters, this paper proposes a supercapacitor design that meets the requirements of high-power charging and discharging. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a high-power supercapacitor, which solves the problems that energy storage elements mainly include thin-film capacitors, lithium batteries, and supercapacitors, but thin-film capacitors and lithium batteries are characterized by large size, heavy weight, low energy density, and poor cycle life.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-power supercapacitor, comprising a casing and individual capacitor cells, wherein the individual capacitor cells are fixedly installed at equal intervals inside the casing, a current sharing circuit is fixedly installed at the bottom of the casing, the individual capacitor cells are electrically connected to the current sharing circuit, and the individual capacitor cells are combined in series and parallel according to their capacitance and transient current parameters.
[0006] Preferably, the total weight of the capacitors after they are interconnected is less than 1.5 kg, and the total volume of the capacitors after they are interconnected is 160 mm × 156 mm × 40 mm, thereby improving the efficiency of the capacitor body.
[0007] Preferably, the number of cycles of the individual capacitors is 500,000 to 1,000,000, and the rated power of the DC / DC bidirectional converter adapted to the supercapacitor composed of the individual capacitors is 6 to 9 kW, thereby further improving the efficiency of the capacitor body.
[0008] Preferably, the input and output voltage ranges of the DC / DC bidirectional converter corresponding to the capacitor body composed of the individual capacitors are both 150V to 350V, which can easily realize the discharge operation.
[0009] This invention provides a high-power supercapacitor. It has the following beneficial effects: This high-power supercapacitor, when used, has a weight controlled within 1.5kg, a volume of 160*156*40mm (length*width*height), and a cycle life of 500,000 to 1,000,000 cycles. This supercapacitor, which meets the requirements of high-power charging and discharging, has effectively improved in terms of weight, volume, cycle life, and power density. This high-power supercapacitor, when used, employs a series-parallel design of the capacitor's capacitance and transient current parameters to improve the device's efficiency. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention.
[0011] In the diagram, 1-shell, 2-cell capacitor, 3-current sharing circuit. Detailed Implementation
[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0013] Please see Figure 1This invention provides a high-power supercapacitor, comprising a housing 1 and capacitor cells 2. The capacitor cells 2 are fixedly installed inside the housing 1 at equal intervals. A current sharing circuit 3 is fixedly installed at the bottom of the housing 1. The capacitor cells 2 are electrically connected to the current sharing circuit 3. The capacitor cells 2 are combined in series and parallel according to their capacitance and transient current parameters. The total weight of the capacitor cells 2 after interconnection is less than 1.5 kg, and the total volume of the capacitor cells 2 after interconnection is 160 mm × 156 mm × 40 mm. The cycle life of the capacitor cells 2 is 500,000 to 1,000,000 times. The rated power of the DC / DC bidirectional converter adapted to the supercapacitor composed of capacitor cells 2 is 6 to 9 kW. The input voltage and output voltage range of the DC / DC bidirectional converter corresponding to the capacitor body composed of capacitor cells 2 are both 150 V to 350 V. Taking a buck-boost bidirectional DC / DC converter with a rated operating power of 6 kW as an example, when the converter operates in forward buck mode, the input voltage is 540 V and the output voltage is 300 V. At this time, the bidirectional converter will charge the supercapacitor with a voltage of 300V, and the charging time is less than 5 seconds. When the bidirectional converter is subjected to an external reverse working state, the converter operates in boost mode, with an input voltage of 300V and an output voltage of 540V. At this time, the supercapacitor discharges at a maximum voltage of 300V and a maximum current of 15A. The supercapacitor voltage gradually decreases while the current remains constant at 15A, and the discharge response time is less than 1.5ms, enabling rapid discharge.
[0014] It should be noted that, in this embodiment, as Figure 1 As shown, taking a 6kW rated power buck-boost bidirectional DC / DC converter as an example, when the converter operates in forward buck mode, the input voltage is 540V and the output voltage is 300V. At this time, the bidirectional converter charges the supercapacitor with 300V, and the charging time is less than 5 seconds. When the bidirectional converter is subjected to reverse operation, it operates in boost mode, with an input voltage of 300V and an output voltage of 540V. In this mode, the supercapacitor discharges at a maximum voltage of 300V and a maximum current of 15A. The supercapacitor voltage gradually decreases while the current remains constant at 15A, with a discharge response time of less than 1.5ms, enabling rapid discharge.
[0015] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0016] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A high-power supercapacitor, characterized in that: The device includes a housing (1) and individual capacitors (2). The individual capacitors (2) are fixedly installed inside the housing (1) at equal intervals. A current sharing circuit (3) is fixedly installed at the bottom of the housing (1). The individual capacitors (2) are electrically connected to the current sharing circuit (3). The individual capacitors (2) are combined in series and parallel according to their capacitance and transient current index.
2. The high-power supercapacitor according to claim 1, characterized in that: The total weight of the capacitors (2) after they are connected together is less than 1.5 kg, and the total volume of the capacitors (2) after they are connected together is 160 mm × 156 mm × 40 mm.
3. The high-power supercapacitor according to claim 1, characterized in that: The number of cycles of the capacitor cell (2) is 500,000 to 1,000,000, and the rated power of the DC / DC bidirectional converter adapted to the supercapacitor composed of the capacitor cell (2) is 6 to 9 kW.
4. A high-power supercapacitor according to claim 1, characterized in that: The input and output voltage ranges of the DC / DC bidirectional converters corresponding to the capacitor body composed of the capacitor cells (2) are both 150V~350V.