Low-temperature-rise power capacitor

Abstract

The utility model discloses a low-temperature-rise power capacitor, and belongs to the technical field of power capacitor manufacturing. According to the low-temperature-rise power capacitor provided by the utility model, the heat dissipation efficiency of the power capacitor is improved in a leap-over manner through the optimization of a heat conduction path, and specifically, the heat dissipation efficiency of the power capacitor is improved through the covering design of the first heat conduction sheet, the second heat conduction sheet, the third heat conduction sheet and the fourth heat conduction sheet on the conductor; the heat generated by the conductor due to resistance loss and the heat generated by the insulation medium loss are quickly conducted to the first heat-conducting fin, the second heat-conducting fin, the third heat-conducting fin and the fourth heat-conducting fin, so that quick heat dissipation is realized; the fifth heat-conducting fin covers the third side wall and the fourth side wall of the core, so that a surrounding heat-conducting structure for the core is formed, heat generated by a plurality of layers of elements in the core due to loss of an insulating medium can be efficiently collected, and the problem that heat of the core of a traditional capacitor can only be singly conducted through a shell is solved; and the dredging efficiency of the loss heat of the insulating medium is improved.

Description

Technical Field

[0001] This utility model relates to the field of power capacitor manufacturing technology, specifically to a low-temperature rise power capacitor. Background Technology

[0002] Power capacitors, as core power equipment in power systems for reactive power compensation, power factor improvement, and grid voltage stabilization, are widely used in power transmission and distribution networks, industrial power supply and distribution systems, and new energy power generation fields such as wind power and photovoltaic power plants.

[0003] However, during operation, active power loss is inevitable due to factors such as dielectric loss and conductor resistance loss. This active power loss is ultimately released as heat, causing the internal temperature of the power capacitor to rise. The temperature rise of the power capacitor directly affects the aging rate of its dielectric, thus shortening the overall lifespan of the power capacitor and affecting the safe and stable operation of the power system. Utility Model Content

[0004] The purpose of this invention is to provide a low-temperature-rise power capacitor to overcome the problem of shortened service life of existing power capacitors due to excessive temperature rise.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model provides a low-temperature rise power capacitor, including a shell, a core, a first connecting piece, a second connecting piece, a first auxiliary connecting piece, and a second auxiliary connecting piece disposed inside the shell; the core is composed of multiple layers of elements, each element including a first electrode plate and a second electrode plate welded with a fuse; the first connecting piece connects the first electrode plate of each layer of elements and is disposed on the first sidewall of the core, and the second connecting piece connects the second electrode plate of each layer of elements and is disposed on the second sidewall of the core; the upper end face of the core is provided with a first lead and a second lead; the first lead is connected to the first connecting piece via the first auxiliary connecting piece tightly attached to the first sidewall, the second sidewall, and the upper end face of the core; the second lead is connected to the second connecting piece via the second auxiliary connecting piece tightly attached to the second sidewall and the upper end face of the core;

[0007] The first connecting piece, the second connecting piece, the first auxiliary connecting piece, and the second auxiliary connecting piece are sequentially covered with a first heat-conducting sheet, a second heat-conducting sheet, a third heat-conducting sheet, and a fourth heat-conducting sheet;

[0008] It also includes a fifth heat-conducting sheet, which covers the third and fourth sidewalls of the core.

[0009] A further improvement of this utility model is that the first, second, third, fourth, and fifth heat-conducting sheets are made of aluminum or copper.

[0010] A further improvement of this utility model is that the thickness of the first heat-conducting sheet, the second heat-conducting sheet, the third heat-conducting sheet, the fourth heat-conducting sheet, and the fifth heat-conducting sheet is 0.5~2mm.

[0011] A further improvement of this invention is that it also includes a sixth heat-conducting sheet, which is disposed on the side wall inside the outer casing.

[0012] A further improvement of this invention is that the sixth heat-conducting sheet is made of aluminum or copper.

[0013] A further improvement of this invention is that the thickness of the sixth heat-conducting sheet is 0.5~2mm.

[0014] A further improvement of this utility model is that the first heat-conducting sheet and the third heat-conducting sheet are not connected at a position other than the connection portion between the first connecting piece and the first auxiliary connecting piece; the second heat-conducting sheet and the fourth heat-conducting sheet are not connected at a position other than the connection portion between the second connecting piece and the second auxiliary connecting piece; and the second heat-conducting sheet and the third heat-conducting sheet are not connected.

[0015] A further improvement of this invention is that an insulating medium is provided between adjacent elements.

[0016] A further improvement of this invention is that the insulating medium is oil-impregnated insulating paper.

[0017] A further improvement of this utility model is that the thickness of the oil-impregnated insulating paper is 0.05~0.2mm.

[0018] Compared with the prior art, the positive and progressive effects of this utility model are as follows:

[0019] The low-temperature rise power capacitor provided by this utility model achieves a significant improvement in heat dissipation efficiency through optimized heat conduction path. Specifically, a first heat-conducting sheet, a second heat-conducting sheet, a third heat-conducting sheet, and a fourth heat-conducting sheet are sequentially covered on the first connecting piece, the second connecting piece, the first auxiliary connecting piece, and the second auxiliary connecting piece, acting as conductors, are rapidly conducted to the first heat-conducting sheet, the second heat-conducting sheet, the third heat-conducting sheet, and the fourth heat-conducting sheet by covering the conductors, thus achieving rapid heat dissipation. The fifth heat-conducting sheet covers the third and fourth sidewalls of the core, forming a surrounding heat-conducting structure for the core. This structure can efficiently collect the heat generated by the insulation loss of the multi-layer components inside the core, overcoming the problem that the heat of the core in traditional capacitors can only be conducted through the outer shell, thus improving the heat dissipation efficiency of insulation loss.

[0020] Furthermore, aluminum sheets offer the advantage of being lightweight, while copper sheets have higher thermal conductivity. The choice between the two materials can balance heat dissipation requirements and structural weight according to actual working conditions, thereby improving heat dissipation efficiency while ensuring electrical performance.

[0021] Furthermore, by adding a sixth heat-conducting fin on the inner sidewall of the casing, the heat dissipation capacity of the casing is enhanced, thereby improving the overall heat dissipation efficiency.

[0022] Furthermore, the first and third heat-conducting sheets are connected only at the connection point between the first connecting piece and the first auxiliary connecting piece, through which the current must pass, and are isolated from each other outside this connection point; the second and fourth heat-conducting sheets are connected only at the connection point between the second connecting piece and the second auxiliary connecting piece, through which the current must pass, and are isolated from each other outside this connection point; the second and third heat-conducting sheets are not connected. This selective connection and isolation design of critical parts physically cuts off the possibility of direct conductive connection between the first and second plates of different polarities on the component. From a structural principle perspective, this effectively avoids inter-electrode short-circuit faults that may be caused by improper arrangement of the first, second, third, and fourth heat-conducting sheets, greatly improving the safety margin of the product and ensuring the safe and stable operation of the power capacitor. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] Figure 1 A schematic diagram of the heart's structure;

[0025] Figure 2 This is a schematic diagram of the structure of the first to fifth heat-conducting plates;

[0026] Figure 3 This is a schematic diagram of the component's structure;

[0027] Figure 4 This is a schematic diagram of the internal structure of the outer shell;

[0028] Figure 5 A detailed schematic diagram of the sixth heat-conducting plate;

[0029] Figure 6 The graph shows the thermodynamic calculation results for Comparative Example 1;

[0030] Figure 7 The graph shows the thermodynamic calculation results of Example 1;

[0031] Figure 8 The graph shows the thermodynamic calculation results for Comparative Example 2;

[0032] Figure 9 The graph shows the thermodynamic calculation results of Example 2;

[0033] Figure 10 The graph shows the thermodynamic calculation results of Example 3;

[0034] Figure 11 The graph shows the results of the thermodynamic calculations for Comparative Example 3.

[0035] Among them, 1. Core; 2. First connecting piece; 3. Second connecting piece; 4. First auxiliary connecting piece; 5. Second auxiliary connecting piece; 6. First heat-conducting plate; 7. Second heat-conducting plate; 8. Third heat-conducting plate; 9. Fourth heat-conducting plate; 10. Fifth heat-conducting plate; 11. Component; 12. Fuse; 13. First electrode plate; 14. Second electrode plate; 15. First lead wire; 16. Second lead wire; 17. Outer shell; 18. Sixth heat-conducting plate. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The present invention will be further described in detail below with reference to the accompanying drawings. The description is intended to explain the present invention and not to limit it.

[0043] This utility model provides a low-temperature rise power capacitor, including a housing 17, and a core 1, a first connecting piece 2, a second connecting piece 3, a first auxiliary connecting piece 4, and a second auxiliary connecting piece 5 disposed inside the housing 17; the core 1 is composed of multiple layers of elements 11, see [reference]. Figure 3 The element 11 includes a first electrode plate 13 and a second electrode plate 14 welded with a fuse 12. A first connecting piece 2 connects the first electrode plate 13 of each layer of element 11 and is disposed on the first side wall of the core 1. A second connecting piece 3 connects the second electrode plate 14 of each layer of element 11 and is disposed on the second side wall of the core 1. A first lead wire 15 and a second lead wire 16 are disposed on the upper end surface of the core 1. The first lead wire 15 is connected to the first connecting piece 2 via a first auxiliary connecting piece 4 that is close to the first side wall, the second side wall and the upper end surface of the core 1. The second lead wire 16 is connected to the second connecting piece 3 via a second auxiliary connecting piece 5 that is close to the second side wall and the upper end surface of the core 1.

[0044] See Figure 1 and Figure 2 The first connecting piece 2, the second connecting piece 3, the first auxiliary connecting piece 4 and the second auxiliary connecting piece 5 are sequentially covered with the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8 and the fourth heat-conducting sheet 9;

[0045] It also includes a fifth heat-conducting sheet 10, which covers the third and fourth sidewalls of the core 1.

[0046] The low-temperature rise power capacitor provided by this invention achieves a significant improvement in the heat dissipation efficiency of power capacitors through optimization of the heat conduction path. Specifically: The first connecting piece 2, the second connecting piece 3, the first auxiliary connecting piece 4, and the second auxiliary connecting piece 5 are sequentially covered with a first heat-conducting sheet 6, a second heat-conducting sheet 7, a third heat-conducting sheet 8, and a fourth heat-conducting sheet 9; wherein, the first connecting piece 2, the second connecting piece 3, the first auxiliary connecting piece 4, and the second auxiliary connecting piece 5 act as conductors, and through the covering design of the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, and the fourth heat-conducting sheet 9, the heat generated by the conductor due to resistance loss and the heat generated by the insulation dielectric loss are quickly conducted to the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, and the fourth heat-conducting sheet 9, achieving rapid heat dissipation; an insulating dielectric is usually provided between the core 1 and the outer shell 17, and the fifth heat-conducting sheet 10 covers the third and fourth sidewalls of the core 1, forming a surrounding heat-conducting structure for the core 1, which can efficiently collect the heat generated by the insulation dielectric loss of the multi-layer components 11 inside the core 1, overcoming the problem that the heat of the traditional capacitor core 1 can only be conducted through the outer shell 17, and improving the heat dissipation efficiency of the insulation dielectric loss.

[0047] In a specific embodiment of this utility model, an oil-impregnated insulating paper is usually provided between the fifth heat-conducting sheet 10 and the second electrode plate 14 to prevent short circuits.

[0048] In a specific embodiment of this utility model, the first electrode plate 13 and the second electrode plate 14 of the core 1 are both made of aluminum alloy. Aluminum alloy itself has excellent thermal conductivity, which can efficiently achieve lateral heat transfer inside the core, directly covering the heat dissipation requirements in the bottom wall direction of the core 1, without the need for additional bottom wall heat-conducting sheets. This is because the bottom wall of the core 1 is not a heat accumulation area that is difficult to transfer. Given that the critical path has been covered in this solution, adding additional bottom wall heat-conducting sheets would be a redundant design and would not significantly improve the heat dissipation effect, so it is unnecessary. In a specific embodiment of this utility model, the dimensions of the power capacitor are 380×185×640mm; the dimensions of the first connecting piece 2 are 551×0.5mm; the dimensions of the second connecting piece 3 are 551×0.5mm; the first auxiliary connecting piece 4 has a four-segment structure with dimensions of 97×0.5mm (lateral) on the first side of the core, 48.5×0.5mm (lateral) on the second side of the core, 378×0.5mm (vertical) on the second side of the core, and 103.5×0.5mm (vertical) on the top surface of the core. mm; the second auxiliary connecting piece 5 has a three-section structure with dimensions of 125×0.5mm on the second side of the core, 378×0.5mm on the second side of the core, and 103.5×0.5mm on the top surface of the core; the widths of the first heat-conducting plate 6, the second heat-conducting plate 7, the third heat-conducting plate 8, and the fourth heat-conducting plate 9 are 140mm, 140mm, 80mm, and 80mm, respectively; the fifth heat-conducting plate 10 has an L-shaped structure with dimensions of 368×551mm and 168×551mm, respectively. The thickness of the first heat-conducting plate 6, the second heat-conducting plate 7, the third heat-conducting plate 8, the fourth heat-conducting plate 9, and the fifth heat-conducting plate 10 is 0.5mm.

[0049] Preferably, the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, the fourth heat-conducting sheet 9, and the fifth heat-conducting sheet 10 are made of aluminum or copper.

[0050] The heat conduction path is optimized by selecting the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, the fourth heat-conducting sheet 9, and the fifth heat-conducting sheet 10, which are made of specific materials. Aluminum and copper sheets, as metal materials with high thermal conductivity, can effectively conduct the heat generated by the third sidewall, the fourth sidewall, the first connecting piece 2, the second connecting piece 3, the first auxiliary connecting piece 4, and the second auxiliary connecting piece 5 of the core 1 to the outer shell 17 quickly.

[0051] Aluminum sheets offer the advantage of being lightweight, while copper sheets have higher thermal conductivity. The choice between the two materials can balance heat dissipation requirements and structural weight according to actual working conditions, thereby improving heat dissipation efficiency while ensuring electrical performance.

[0052] Preferably, the thickness of the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, the fourth heat-conducting sheet 9, and the fifth heat-conducting sheet 10 is 0.5~2mm.

[0053] By limiting the thickness of the first heat-conducting plate 6, the second heat-conducting plate 7, the third heat-conducting plate 8, the fourth heat-conducting plate 9, and the fifth heat-conducting plate 10 to a range of 0.5~2mm, insufficient mechanical strength due to excessive thickness is avoided, while excessive thickness increases the overall volume and material cost, affecting heat dissipation efficiency and structural compactness. This thickness range balances heat dissipation performance and structural stability, ensuring efficient heat transfer and thus suppressing internal temperature rise of the capacitor.

[0054] Preferably, it also includes a sixth heat-conducting plate 18, which is disposed on the side wall inside the housing 17.

[0055] See Figure 4 To demonstrate the location of the sixth heat-conducting plate 18, a portion of the outer casing 17 was cut away, allowing a direct view of its internal structure. (See attached image.) Figure 5 The outer shell 17 is for the addition of a sixth heat-conducting plate 18.

[0056] The existing power capacitor casing 17 is usually made of stainless steel. Although stainless steel has advantages such as strong corrosion resistance and wear resistance, its heat dissipation capacity is poor. By adding a sixth heat-conducting fin 18 to the side wall inside the casing 17, the heat dissipation capacity of the casing 17 is enhanced, thereby improving the overall heat dissipation efficiency.

[0057] Preferably, the sixth heat-conducting sheet 18 is made of aluminum or copper.

[0058] Preferably, the thickness of the sixth heat-conducting sheet 18 is 0.5~2mm.

[0059] By controlling the thickness of the sixth heat-conducting plate 18 to a lower limit of 0.5 mm, the basic thermal conductivity cross-sectional area is ensured to meet heat dissipation requirements while avoiding insufficient mechanical strength due to excessive thinness. Setting the upper limit to 2 mm prevents excessive encroachment on the internal space of the power capacitor due to excessive thickness, while also controlling material usage to avoid cost waste. This thickness range allows the sixth heat-conducting plate 18, covering the side wall of the outer casing 17, to fully conduct heat, achieving the temperature rise control target, while also taking into account the special requirements of power capacitors as electrical equipment for structural compactness. The heat dissipation effect is optimized through precise parameter range limitation.

[0060] Preferably, the first heat-conducting sheet 6 and the third heat-conducting sheet 8 are not connected outside the connection portion between the first connecting piece 2 and the first auxiliary connecting piece 4; the second heat-conducting sheet 7 and the fourth heat-conducting sheet 9 are not connected outside the connection portion between the second connecting piece 3 and the second auxiliary connecting piece 5; and the second heat-conducting sheet 7 and the third heat-conducting sheet 8 are not connected.

[0061] By restricting the positions of the first heat-conducting plate 6, the second heat-conducting plate 7, the third heat-conducting plate 8, and the fourth heat-conducting plate 9, a high level of electrical safety is achieved while improving heat dissipation performance. Specifically: the first heat-conducting plate 6 and the third heat-conducting plate 8 are only connected at the connection point between the first connecting piece 2 and the first auxiliary connecting piece 4, through which current must pass, and are isolated from each other outside this connection point; the second heat-conducting plate 7 and the fourth heat-conducting plate 9 are only connected at the connection point between the second connecting piece 3 and the second auxiliary connecting piece 5, through which current must pass, and are isolated from each other outside this connection point; the second heat-conducting plate 7 and the third heat-conducting plate 8 are not connected. This selective connection and isolation design of critical parts physically cuts off the possibility of direct conductive connection between the different polarities of the first electrode plate 13 and the second electrode plate 14 on the component 11. From a structural principle perspective, this effectively avoids inter-electrode short-circuit faults that may be caused by improper arrangement of the first heat-conducting plate 6, the second heat-conducting plate 7, the third heat-conducting plate 8, and the fourth heat-conducting plate 9, greatly improving the safety margin of the product and ensuring the safe and stable operation of the power capacitor.

[0062] Preferably, an insulating medium is provided between adjacent elements 11.

[0063] By setting an insulating medium between adjacent components 11 to form a physical isolation layer, the insulating medium can effectively disperse the electric field intensity between components 11, suppress partial discharge and leakage current caused by electric field distortion, effectively reduce the active power loss during the operation of the power capacitor, and thus control the temperature rise rate.

[0064] Preferably, the insulating medium is oil-impregnated insulating paper.

[0065] Preferably, the thickness of the oil-impregnated insulating paper is 0.05~0.2mm.

[0066] By limiting the thickness range of the oil-impregnated insulating paper, heat dissipation efficiency is improved while ensuring insulation strength, effectively alleviating the problem of accelerated aging of the insulating medium due to local temperature rise, thereby improving the operational stability and service life of power capacitors.

[0067] Example 1

[0068] A low-temperature rise power capacitor includes a housing 17, a core 1, a first connecting piece 2, a second connecting piece 3, a first auxiliary connecting piece 4, and a second auxiliary connecting piece 5 disposed inside the housing 17. The core 1 is composed of multiple layers of elements 11, each element 11 including a first electrode plate 13 and a second electrode plate 14 welded with a fuse 12. The first connecting piece 2 connects to the first electrode plate 13 of each layer of elements 11 and is disposed on the first sidewall of the core 1. The second connecting piece 3 connects to the second electrode plate 14 of each layer of elements 11 and is disposed on the second sidewall of the core 1. A first lead 15 and a second lead 16 are disposed on the upper end face of the core 1. The first lead 15 is connected to the first connecting piece 2 via the first auxiliary connecting piece 4, which is tightly attached to the first sidewall, the second sidewall, and the upper end face of the core 1. The second lead 16 is connected to the second connecting piece 3 via the second auxiliary connecting piece 5, which is tightly attached to the second sidewall and the upper end face of the core 1.

[0069] The first connecting piece 2, the second connecting piece 3, the first auxiliary connecting piece 4 and the second auxiliary connecting piece 5 are sequentially covered with a first heat-conducting sheet 6, a second heat-conducting sheet 7, a third heat-conducting sheet 8 and a fourth heat-conducting sheet 9;

[0070] It also includes a fifth heat-conducting sheet 10, which covers the third and fourth sidewalls of the core 1.

[0071] Among them, the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, the fourth heat-conducting sheet 9, and the fifth heat-conducting sheet 10 are all made of aluminum sheets.

[0072] Comparative Example 1

[0073] A power capacitor includes a core 1, a first connecting piece 2, a second connecting piece 3, a first auxiliary connecting piece 4, and a second auxiliary connecting piece 5 disposed inside a housing 17. The core 1 is composed of multiple layers of elements 11, each element 11 including a first electrode plate 13 and a second electrode plate 14 welded with a fuse 12. The first connecting piece 2 connects to the first electrode plate 13 of each layer of elements 11 and is disposed on the first sidewall of the core 1. The second connecting piece 3 connects to the second electrode plate 14 of each layer of elements 11 and is disposed on the second sidewall of the core 1. A first lead 15 and a second lead 16 are disposed on the upper end face of the core 1. The first lead 15 is connected to the first connecting piece 2 via the first auxiliary connecting piece 4 which is close to the first sidewall, the second sidewall, and the upper end face of the core 1. The second lead 16 is connected to the second connecting piece 3 via the second auxiliary connecting piece 5 which is close to the second sidewall and the upper end face of the core 1.

[0074] The difference from Example 1 is that Comparative Example 1 does not have any heat-conducting plates.

[0075] Comparative Example 2

[0076] A power capacitor includes a core 1, a first connecting piece 2, a second connecting piece 3, a first auxiliary connecting piece 4, and a second auxiliary connecting piece 5 disposed inside a housing 17. The core 1 is composed of multiple layers of elements 11, each element 11 including a first electrode plate 13 and a second electrode plate 14 welded with a fuse 12. The first connecting piece 2 connects to the first electrode plate 13 of each layer of elements 11 and is disposed on the first sidewall of the core 1. The second connecting piece 3 connects to the second electrode plate 14 of each layer of elements 11 and is disposed on the second sidewall of the core 1. A first lead 15 and a second lead 16 are disposed on the upper end face of the core 1. The first lead 15 is connected to the first connecting piece 2 via the first auxiliary connecting piece 4, which is tightly attached to the first sidewall, the second sidewall, and the upper end face of the core 1. The second lead 16 is connected to the second connecting piece 3 via the second auxiliary connecting piece 5, which is tightly attached to the second sidewall and the upper end face of the core 1.

[0077] It also includes a sixth heat-conducting plate 18, which is disposed on the side wall inside the housing 17.

[0078] The difference from Comparative Example 1 is that Comparative Example 2 also includes a sixth heat-conducting sheet 18, and the sixth heat-conducting sheet 18 is made of aluminum.

[0079] Comparative Example 3

[0080] The difference from Comparative Example 1 is that a heat-conducting plate with dimensions of 367*172*2mm is provided on the bottom wall inside the outer casing 17; the heat-conducting plate is made of aluminum.

[0081] Example 2

[0082] The difference from Embodiment 1 is that it also includes a sixth heat-conducting sheet 18, which is disposed on the side wall inside the housing 17, and the sixth heat-conducting sheet 18 is made of aluminum.

[0083] Example 3

[0084] The difference from Embodiment 2 is that the first heat-conducting sheet 6, the second heat-conducting sheet 7, the third heat-conducting sheet 8, the fourth heat-conducting sheet 9, the fifth heat-conducting sheet 10 and the sixth heat-conducting sheet 18 are all made of copper sheets.

[0085] To verify the effectiveness of the technical solution provided by this utility model, thermal calculations were performed on the power capacitors provided in Embodiments 1 to 3 and the comparative example. The results are analyzed as follows:

[0086] See Figure 6 The hot spot temperature of the power capacitor provided in Comparative Example 1 is 84.7℃; the temperature rise is 29.7K when the ambient temperature is 55℃.

[0087] See Figure 8The hot spot temperature of the power capacitor provided in Comparative Example 2 is 81.9℃; at an ambient temperature of 55℃, the temperature rise is 26.9K; compared with Comparative Example 1, it is 2.8K lower, and the temperature rise decrease is 9.4%.

[0088] See Figure 11 The hot spot temperature of the power capacitor provided in Comparative Example 3 is 84.5℃; at an ambient temperature of 55℃, the temperature rise is 29.5K; compared with Comparative Example 1, it is 0.2K lower; the temperature rise decrease is 0.67%.

[0089] See Figure 7 The hot spot temperature of the low-temperature rise power capacitor provided in Example 1 is 80.8°C. When the ambient temperature is 55°C, the temperature rise is 25.8K, which is 3.9K lower than that of Comparative Example 1. The temperature rise decrease is 13.1%.

[0090] See Figure 9 The hot spot temperature of the low-temperature rise power capacitor provided in Example 2 is 78.8°C. When the ambient temperature is 55°C, the temperature rise is 23.8K, which is 5.9K lower than that of Comparative Example 1. The temperature rise decrease is 19.9%.

[0091] See Figure 10 The hot spot temperature of the low-temperature rise power capacitor provided in Example 3 is 78.1°C. When the ambient temperature is 55°C, the temperature rise is 23.1K. Compared with Comparative Example 1, it is 6.6K lower, and the temperature rise decrease is 22.2%.

[0092] Analysis shows that the low-temperature-rise power capacitor provided by this invention can effectively reduce the temperature rise of the power capacitor. Furthermore, although copper sheets are more expensive and heavier, using copper sheets with a higher thermal conductivity can further reduce the temperature rise. In practical applications, the appropriate capacitor can be selected based on actual needs, providing high flexibility in power capacitor product design and possessing significant practical value. Simultaneously, in some high-temperature environments, the temperature rise range of the power capacitor needs to be particularly small due to the limitation of hot spot temperatures, which existing capacitors cannot meet. The low-temperature-rise power capacitor provided by this invention is remarkably effective in reducing temperature rise, and can better control its own temperature rise in high-temperature environments, effectively avoiding problems caused by excessively high temperatures.

[0093] Finally, it should be noted that the embodiments listed above are merely one or more specific manifestations of the technical solution of this utility model. Their purpose is to clearly illustrate the concept, principle, and application of this utility model through specific examples, and is by no means intended to limit the scope of protection of this utility model to these specific embodiments. In fact, the true value of this utility model lies in its proposed technical ideas and innovations, rather than its manifestations or implementation methods.

[0094] For those skilled in the art, after thoroughly reading and understanding the technical solution of this utility model, they are fully capable of making various changes, modifications, or equivalent substitutions to the specific embodiments of the utility model based on their own professional knowledge and skills. These changes may include, but are not limited to: adjusting the range of technical parameters, optimizing the algorithm flow to improve efficiency, and replacing some technical components to achieve better compatibility or reduce costs. As long as these modified technical solutions substantially retain the technical features claimed by the original utility model, that is, they can still achieve the core functions and effects of this utility model, then these changes should be considered to fall within the scope of protection of the pending claims of this utility model.

[0095] Furthermore, with the continuous progress and development of technology, new technical means and methods are constantly emerging, which provides ample space for the further improvement and perfection of this utility model. Therefore, the scope of protection of this utility model should also include reasonable and foresightful improvements and extensions based on existing technology. As long as these improvements and extensions do not deviate from the basic principles and core concept of this utility model, they should be regarded as equivalents of this utility model and are equally protected by patent rights.

Claims

1. A low-temperature-rise power capacitor, characterized by comprising: The application relates to a fuse, which comprises a shell (17), a core (1) arranged inside the shell (17), a first connecting sheet (2), a second connecting sheet (3), a first auxiliary connecting sheet (4) and a second auxiliary connecting sheet (5); the core (1) is composed of multiple layers of elements (11), the element (11) comprises a first polar plate (13) and a second polar plate (14) welded with a fuse (12), the first connecting sheet (2) is connected with the first polar plate (13) of each layer of elements (11) and is arranged on a first side wall of the core (1), the second connecting sheet (3) is connected with the second polar plate (14) of each layer of elements (11) and is arranged on a second side wall of the core (1); a first lead-out wire (15) and a second lead-out wire (16) are arranged on an upper end surface of the core (1), the first lead-out wire (15) is connected with the first connecting sheet (2) through the first auxiliary connecting sheet (4) closely arranged on the first side wall, the second side wall and the upper end surface of the core (1); the second lead-out wire (16) is connected with the second connecting sheet (3) through the second auxiliary connecting sheet (5) closely arranged on the second side wall and the upper end surface of the core (1); The first connecting sheet (2), the second connecting sheet (3), the first auxiliary connecting sheet (4) and the second auxiliary connecting sheet (5) are sequentially covered with a first heat-conducting sheet (6), a second heat-conducting sheet (7), a third heat-conducting sheet (8) and a fourth heat-conducting sheet (9); the application further comprises a fifth heat-conducting sheet (10), and the fifth heat-conducting sheet (10) covers a third side wall and a fourth side wall of the core (1).

2. A low-temperature-rise power capacitor according to claim 1, wherein The first heat-conducting sheet (6), the second heat-conducting sheet (7), the third heat-conducting sheet (8), the fourth heat-conducting sheet (9) and the fifth heat-conducting sheet (10) are made of aluminum sheets or copper sheets.

3. A low-ESR power capacitor according to claim 1, wherein The thickness of the first heat-conducting sheet (6), the second heat-conducting sheet (7), the third heat-conducting sheet (8), the fourth heat-conducting sheet (9) and the fifth heat-conducting sheet (10) is 0.5-2mm.

4. A low-ESR power capacitor according to claim 1, wherein The application further comprises a sixth heat-conducting sheet (18), and the sixth heat-conducting sheet (18) is arranged on a side wall inside the shell (17).

5. A low-temperature-rise power capacitor according to claim 4, wherein The sixth heat-conducting sheet (18) is made of an aluminum sheet or a copper sheet.

6. A low-ESR power capacitor according to claim 4, wherein The thickness of the sixth heat-conducting sheet (18) is 0.5-2mm.

7. A low-ESR power capacitor according to claim 1, wherein The first heat-conducting sheet (6) and the third heat-conducting sheet (8) are not connected at positions outside the connecting part of the first connecting sheet (2) and the first auxiliary connecting sheet (4); the second heat-conducting sheet (7) and the fourth heat-conducting sheet (9) are not connected at positions outside the connecting part of the second connecting sheet (3) and the second auxiliary connecting sheet (5); and the second heat-conducting sheet (7) and the third heat-conducting sheet (8) are not connected.

8. A low-ESR power capacitor according to claim 1, wherein An insulating medium is arranged between adjacent elements (11).

9. A low-temperature-rise power capacitor according to claim 8, wherein The insulating medium is oil-immersed insulating paper.

10. A low-ESR power capacitor according to claim 9, wherein The thickness of the oil-immersed insulating paper is 0.05-0.2mm.

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