A liquid-cooled capacitor and controller

Abstract

The application provides a liquid-cooled capacitor and a controller. The liquid-cooled capacitor is installed on a case, the case is provided with a case water channel, the liquid-cooled capacitor is provided with a capacitor and a capacitor water channel; the capacitor water channel is arranged around the capacitor; the capacitor water channel is communicated with the case water channel; the capacitor water channel is injected with cooling liquid, and the cooling liquid can flow in the capacitor water channel and the case water channel. The controller comprises the liquid-cooled capacitor. The capacitor water channel is arranged around the capacitor, and the capacitor water channel is communicated with the case water channel to form a cooling liquid circulation path, so that the heat transfer distance is shortened. When the capacitor generates heat during operation, the heat can be quickly transferred to the surrounding capacitor water channel, the heat is efficiently taken away through the direct flow of the cooling liquid, the heat dissipation efficiency is greatly improved, and the heat dissipation demand under the high-power working condition can be met.

Description

Technical Field

[0001] This application belongs to the field of controller technology, and more specifically, relates to a liquid-cooled capacitor and a controller. Background Technology

[0002] In the fields of electric drive and control for new energy vehicles, the motor controller, as a core component, directly affects the overall vehicle's operating efficiency and reliability due to its heat dissipation performance. In existing technologies, the capacitors in motor controllers typically achieve water cooling through direct or indirect contact with the chassis. This structural design has significant shortcomings. On the one hand, the heat transfer path is relatively long, resulting in low heat dissipation efficiency and difficulty meeting the heat dissipation requirements under high-power conditions. On the other hand, to ensure heat dissipation, thermal pads, thermal grease, and other thermally conductive materials need to be installed between the capacitors and the chassis. This not only increases the number of components and assembly steps but also requires additional tooling, reducing the convenience of production and assembly, and also causing inconvenience for subsequent maintenance. Furthermore, traditional chassis water channel designs often result in areas of thick material due to the large contact area. During mold processing, these thick areas are prone to defects such as pores and pinholes due to uneven cooling rates, affecting the product's structural strength and sealing performance, and increasing the defect rate during production. Utility Model Content

[0003] The purpose of this application is to provide a liquid-cooled capacitor and a controller to solve the technical problem of insufficient capacitor heat dissipation efficiency in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a liquid-cooled capacitor is provided, which is installed on a chassis. The chassis has a water channel. The liquid-cooled capacitor includes a capacitor and a capacitor water channel. The capacitor water channel is arranged around the capacitor. The capacitor water channel is connected to the chassis water channel. Coolant is injected into the capacitor water channel, and the coolant can circulate in the capacitor water channel and the chassis water channel.

[0005] Furthermore, the liquid-cooled capacitor also includes a capacitor housing, on which the capacitor water channel is provided; the capacitor is disposed inside the capacitor housing; the capacitor housing is mounted on the chassis by fasteners. Furthermore, the capacitor is surrounded by a first side area and a second side area, the capacitor water channel covers the first side area of ​​the capacitor, and the second side area of ​​the capacitor is fixed close to the chassis water channel through the capacitor shell. Furthermore, the capacitor housing is provided with mounting feet, and the mounting feet are provided with mounting holes for inserting fasteners to fix the capacitor housing to the chassis.

[0006] Furthermore, the capacitor water channel is provided with an inlet and an outlet, and the chassis water channel is provided with a first interface and a second interface; the inlet is sealed to the first interface, the outlet is sealed to the second interface, and the outlet is sealed to the corresponding interface of the chassis water channel respectively.

[0007] Furthermore, the number of mounting feet is at least two, and they are symmetrically distributed along the outer periphery of the capacitor housing; the water inlet and the water outlet are respectively provided on the two mounting feet.

[0008] Furthermore, a seal is provided at the connection between the mounting foot and the chassis to prevent coolant leakage at the connection between the capacitor channel and the chassis channel.

[0009] Furthermore, the capacitor is fixed inside the capacitor housing by a potting process.

[0010] This application also provides a controller, including the liquid-cooled capacitor described above.

[0011] Furthermore, the controller also includes a functional module connected to the capacitor housing. The end face of the capacitor housing connected to the functional module is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

[0012] The beneficial effects of the liquid-cooled capacitor and controller provided in this application are as follows: Compared with the prior art, this application significantly shortens the heat transfer distance by directly placing the capacitor water channels around the capacitor and connecting them with the chassis water channels to form a coolant circulation path. When the capacitor generates heat during operation, the heat can be quickly transferred to the surrounding capacitor water channels, and the heat is efficiently carried away by the direct flow of coolant, greatly improving heat dissipation efficiency and meeting the heat dissipation requirements under high-power conditions. Simultaneously, this integrated structure eliminates the need for additional thermally conductive materials between the capacitor and the chassis, reducing the number of parts and assembly steps, eliminating the need for auxiliary tooling, improving the convenience of production assembly, and facilitating subsequent maintenance. Furthermore, by avoiding the localized thick material areas formed by the large contact area in traditional chassis water channel designs, the risk of defects such as pores and pinholes caused by uneven cooling rates during mold processing is reduced, which helps ensure the structural strength and sealing performance of the product, thereby reducing the defect rate during production. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A three-dimensional structural diagram of the liquid-cooled capacitor provided in the embodiments of this application. Figure 1 ; Figure 2 A three-dimensional structural diagram of the liquid-cooled capacitor provided in the embodiments of this application. Figure 2 ; Figure 3 A cross-sectional view of the liquid-cooled capacitor provided in an embodiment of this application; Figure 4 This is a cross-sectional view of a liquid-cooled capacitor mounted on a chassis, as provided in an embodiment of this application.

[0015] The following are the labeling elements in the figure: 100 - Capacitor housing; 101 - Mounting foot; 111 - Mounting hole; 102 - Sealing groove; 200-capacitor; 300 - Capacitor water channel; 301 - Inlet; 302 - Outlet; 400 - Chassis; 401 - Chassis water channels. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0017] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0018] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Please refer to the following: Figure 1 and Figure 2 The liquid-cooled capacitor provided in this application embodiment will now be described. This liquid-cooled capacitor is mounted on a chassis 400, which has a chassis water channel 401. The liquid-cooled capacitor includes a capacitor 200 and capacitor water channels 300; the capacitor water channels 300 are disposed around the capacitor 200; the capacitor water channels 300 are connected to the chassis water channel 401; coolant is injected into the capacitor water channels 300, and the coolant can circulate within the capacitor water channels 300 and the chassis water channel 401, such as... Figure 3 and Figure 4 As shown in the figure, the direction indicated by the arrow is the flow direction of the coolant.

[0021] Compared with the prior art, the liquid-cooled capacitor provided in this application significantly shortens the heat transfer distance by directly placing the capacitor water channels 300 around the capacitor 200 and connecting them with the chassis water channels 401 to form a coolant circulation path. When the capacitor 200 generates heat during operation, the heat can be quickly transferred to the surrounding capacitor water channels 300, and the heat is efficiently carried away by the direct flow of coolant, greatly improving heat dissipation efficiency and meeting the heat dissipation requirements under high-power conditions. At the same time, this integrated structure eliminates the need for additional thermally conductive materials between the capacitor and the chassis 400, reducing the number of parts and assembly steps, eliminating the need for auxiliary tooling, improving the convenience of production assembly, and also bringing convenience to subsequent maintenance. In addition, by avoiding the local thick material areas formed by the large contact area in the traditional chassis water channel 401 design, the risk of defects such as pores and pinholes caused by uneven cooling rates during mold processing is reduced, which helps to ensure the structural strength and sealing performance of the product, thereby reducing the defect rate in the production process.

[0022] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The liquid-cooled capacitor also includes a capacitor housing 100, on which capacitor water channels 300 are provided; the capacitor 200 is disposed inside the capacitor housing 100; the capacitor housing 100 is mounted on the chassis 400 by fasteners. In this embodiment, the capacitor housing 100 provides a stable mounting carrier for the capacitor 200. Its material is a metal with good thermal conductivity, such as aluminum alloy or copper alloy, which further enhances the efficiency of heat transfer from the capacitor 200 to the capacitor channel 300. The inner wall of the capacitor housing 100 is tightly fitted to the outer wall of the capacitor 200, ensuring that heat can be quickly conducted to the housing through direct contact, and then transferred from the housing to the capacitor channel 300 disposed on its surface.

[0023] In one embodiment of this application, the capacitor is surrounded by a first side area and a second side area. The capacitor water channel 300 covers the first side area of ​​the capacitor 200, and the second side area of ​​the capacitor 200 is fixed close to the chassis water channel 401 through the capacitor housing 100.

[0024] In this embodiment, the capacitor water channel 300 and the chassis water channel 401 are combined to cover the capacitor 200. This combined covering method can form a comprehensive enveloping heat dissipation for the capacitor 200. The capacitor water channel 300 directly acts on the first side area, which can quickly remove the heat generated in the area. The second side area is fixed close to the chassis water channel 401 through the capacitor shell 100. With the help of the thermal conductivity of the capacitor shell 100, the heat is indirectly transferred to the chassis water channel 401 for dissipation. The two work together to effectively expand the heat dissipation area and further improve the heat dissipation efficiency. This ensures that the temperature of the capacitor 200 is kept within a reasonable range during long-term operation, and avoids the impact of local overheating on the performance and service life of the capacitor 200.

[0025] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The capacitor housing 100 is provided with mounting feet 101, which are connected to the chassis 400.

[0026] In this embodiment, by providing mounting feet 101 on the capacitor housing 100, a stable connection between the integrated capacitor and water channel structure and the chassis 400 can be achieved, ensuring that the structure will not shift or loosen during equipment operation. The design of the mounting feet 101 provides a clear connection position for fixing the structure, making the assembly process more precise and efficient. It also provides structural support for the docking of the capacitor water channel 300 and the chassis water channel 401, ensuring the sealing and stability of the coolant circulation path.

[0027] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 Mounting foot 101 is provided with mounting hole 111, which is used to insert fasteners to fix capacitor housing 100 to chassis 400.

[0028] In this embodiment, the mounting hole 111 provides a suitable space for fastener installation, allowing operators to securely fix the capacitor housing 100 to the chassis 400 using standard fasteners such as bolts and screws. This detachable connection method not only facilitates the installation and disassembly of the structure but also allows for quick separation of the capacitor from the chassis 400 during maintenance or capacitor replacement, improving operational flexibility. Simultaneously, the tightening force of the fasteners ensures a tight fit between the mounting feet 101 and the chassis 400, further enhancing the stability of the connection structure and preventing loosening due to equipment vibration or other factors. This ensures the sealing performance at the connection between the capacitor coolant channel 300 and the chassis coolant channel 401, preventing coolant leakage.

[0029] In one embodiment of this application, please refer to the following: Figure 2 and Figure 3 The capacitor water channel 300 is provided with an inlet 301 and an outlet 302, and the chassis water channel 401 is provided with a first interface and a second interface; the inlet 301 is sealed to the first interface, the outlet 302 is sealed to the second interface, and the outlet 302 is sealed to the corresponding interface of the chassis water channel 401 respectively.

[0030] In this embodiment, the sealed connection between the inlet 301 and the first interface, and the sealed connection between the outlet 302 and the second interface, establish a closed path for the coolant to flow between the capacitor channel 300 and the chassis channel 401. This corresponding interface sealing design effectively prevents coolant leakage from the connection points during transmission, ensuring that the coolant can circulate stably according to the preset flow path, thereby fully utilizing the heat dissipation effect of the liquid cooling system on the capacitor. At the same time, the standardized interface design also facilitates the connection of the channels when installing and replacing capacitors. Operators only need to accurately align the inlet 301 and outlet 302 with the first and second interfaces of the chassis channel 401 respectively and complete the sealing connection to quickly connect the coolant circuit, simplifying the assembly process and improving production and maintenance efficiency.

[0031] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The number of mounting feet 101 is at least two, and they are symmetrically distributed along the outer periphery of the capacitor housing 100.

[0032] In this embodiment, at least two symmetrically distributed mounting feet 101 ensure a more balanced connection force between the capacitor housing 100 and the chassis 400, preventing structural deformation due to excessive force at a single point. The symmetrical design ensures uniform force distribution at the interface between the capacitor channel 300 and the chassis channel 401 during docking, reducing sealing gaps caused by installation deviations and further improving the sealing reliability of the connection. Simultaneously, the symmetrically distributed mounting feet 101 ensure a more central and stable installation position of the capacitor 200 within the chassis 400, reducing vibrations caused by center-of-gravity shifts during equipment operation. This reduces fatigue damage to the capacitor 200 and the channel structure, ensuring long-term stable operation of the overall structure.

[0033] In one embodiment of this application, please refer to the following: Figure 2 and Figure 3 The inlet 301 and the outlet 302 are respectively set on the two mounting feet 101.

[0034] In this embodiment, the inlet 301 and outlet 302 are integrated onto the mounting foot 101, making full use of the structural space of the mounting foot 101 and achieving functional integration. This layout organically combines the water inlet and outlet paths of the capacitor channel 300 with the connection structure of the mounting foot 101, eliminating the need for additional independent interface components and reducing structural complexity. When the mounting foot 101 is connected to the chassis 400, the inlet 301 and outlet 302 can directly and precisely mate with the corresponding interfaces of the chassis channel 401, shortening the length of the connecting pipes, reducing fluid resistance, and avoiding potential leakage risks caused by additional interfaces. Furthermore, this design makes the overall structure more compact, saving installation space inside the chassis 400 and providing greater flexibility for the layout of other functional modules of the controller.

[0035] In one embodiment of this application, a seal is provided at the connection between the mounting foot 101 and the chassis 400 to prevent coolant leakage at the connection between the capacitor channel 300 and the chassis channel 401.

[0036] In this embodiment, the sealing element effectively fills the tiny gap between the mounting foot 101 and the chassis 400, forming a reliable sealing interface through its own elastic deformation. When the capacitor water channel 300 is connected to the chassis water channel 401, the coolant will generate a certain pressure at the connection point during circulation. The sealing element can offset the leakage risk caused by the pressure with its good compression and resilience, ensuring that the coolant circulates only inside the water channel and does not leak out. Common sealing elements, such as rubber sealing rings and silicone gaskets, are made of materials that are resistant to coolant corrosion and high-temperature aging, maintaining a stable sealing effect during long-term use, extending the service life of the structure, and reducing the probability of equipment failure due to leakage.

[0037] In one embodiment of this application, the capacitor 200 is fixed inside the capacitor housing 100 by a potting process.

[0038] In this embodiment, the potting process utilizes the high strength of the cured adhesive to form a robust integral structure between the capacitor 200 and the capacitor housing 100, effectively preventing displacement or shaking of the capacitor 200 due to vibration, impact, or other external forces during equipment operation. The potting material typically has good thermal conductivity, further promoting the transfer of heat generated by the capacitor 200 to the capacitor housing 100 and surrounding capacitor channels 300, improving overall heat dissipation. Simultaneously, the potting process fills the gap between the capacitor 200 and the capacitor housing 100, creating a sealed environment to prevent external dust, moisture, and other impurities from entering the capacitor and affecting its performance. It also provides insulation protection for the capacitor 200, reducing the risk of electrical faults such as short circuits. Furthermore, the potting process is simple to operate, can be automated for mass production, improving production efficiency, and the cured adhesive has high chemical stability, adapting to temperature changes and environmental corrosion during long-term use, ensuring stable operation of the capacitor 200.

[0039] This application also provides a controller, including the liquid-cooled capacitor described above.

[0040] In this embodiment, the application of liquid-cooled capacitors to the controller significantly improves its overall heat dissipation performance. Since the capacitor is one of the key heat-generating components in the controller, its heat dissipation efficiency directly affects the controller's operational stability and lifespan. By integrating the capacitor with the cooling system, the heat generated during capacitor operation can be quickly dissipated through coolant circulation, preventing heat accumulation inside the controller and creating a favorable temperature environment for other functional modules. This integrated heat dissipation solution eliminates the need for a separate heat dissipation structure for the capacitor, simplifying the controller's internal layout and facilitating its miniaturization and weight reduction. Simultaneously, it reduces the number of components, lowers the assembly difficulty and production cost of the controller, and enhances the product's market competitiveness.

[0041] In one embodiment of this application, the controller further includes a functional module connected to the capacitor housing 100. The end face of the capacitor housing 100 connected to the functional module is provided with a sealing groove 102, and a sealing ring is provided in the sealing groove 102.

[0042] In this embodiment, the functional module is mounted on the capacitor housing 100. The coolant in the capacitor water channel 300 cools and dissipates heat from the capacitor 200, and also cools and dissipates heat from the functional module. Through heat conduction in the capacitor housing 100, the heat generated by the functional module during operation is transferred to the capacitor water channel 300, further improving the overall heat dissipation efficiency inside the controller. The design of the sealing groove 102 and the sealing ring can form a reliable seal between the functional module and the capacitor housing 100, preventing external dust, moisture and other impurities from entering.

[0043] Specifically, the functional module can be connected to the capacitor housing 100 using fasteners. For example, standard parts such as bolts and screws can be used to fix the module by passing through the pre-set mounting holes 111 on the functional module and engaging with the threaded holes on the capacitor housing 100. This connection method is not only simple in structure and convenient to assemble, but also ensures a tight fit between the functional module and the capacitor housing 100, which is beneficial for efficient heat conduction. At the same time, the selection of fasteners can be flexibly adjusted according to actual working conditions to meet different requirements in terms of strength and corrosion resistance, further enhancing the reliability and adaptability of the controller structure.

[0044] The sealing ring can be made of silicone rubber or fluororubber with temperature and aging resistance to ensure good elasticity and sealing performance during long-term use. After the functional module is fixed to the capacitor housing 100 with fasteners, the sealing ring deforms under pressure, tightly filling the gap between the sealing groove 102 and the functional module, effectively preventing external contaminants from entering and protecting the electronic components inside the controller from damage. Furthermore, this sealing structure design can also, to a certain extent, prevent the mutual transfer of heat within the controller, avoiding temperature cross-influence between different functional modules, further optimizing the controller's heat dissipation layout and improving overall operational stability.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid-cooled capacitor, installed inside a chassis, characterized in that, The chassis is equipped with a water channel, and the liquid-cooled capacitor includes: capacitance; The capacitor water channel is arranged around the capacitor; the capacitor water channel is connected to the chassis water channel; coolant is injected into the capacitor water channel and the coolant can circulate in the capacitor water channel and the chassis water channel.

2. A liquid-cooled capacitor as described in claim 1, characterized in that, The liquid-cooled capacitor also includes a capacitor housing, on which the capacitor water channel is provided; the capacitor is disposed inside the capacitor housing; the capacitor housing is mounted on the chassis by fasteners.

3. The liquid-cooled capacitor as described in claim 2, characterized in that, The capacitor is surrounded by a first side area and a second side area. The capacitor water channel covers the first side area of ​​the capacitor, and the second side area of ​​the capacitor is fixed to the chassis water channel through the capacitor shell.

4. The liquid-cooled capacitor as described in claim 3, characterized in that, The capacitor housing is provided with mounting feet, and the mounting feet are provided with mounting holes. The mounting holes are used to pass through the fasteners to fix the capacitor housing to the chassis.

5. The liquid-cooled capacitor as described in claim 4, characterized in that, The capacitor water channel is provided with an inlet and an outlet, and the chassis water channel is provided with a first interface and a second interface; the inlet is sealed to the first interface, the outlet is sealed to the second interface, and the outlet is sealed to the corresponding interface of the chassis water channel.

6. The liquid-cooled capacitor as described in claim 5, characterized in that, The number of mounting feet is at least two, and they are symmetrically distributed along the outer periphery of the capacitor housing; the water inlet and the water outlet are respectively provided on the two mounting feet.

7. The liquid-cooled capacitor as described in claim 6, characterized in that, A seal is provided at the connection between the mounting foot and the chassis to prevent coolant leakage at the connection between the capacitor channel and the chassis channel.

8. The liquid-cooled capacitor as described in claim 2, characterized in that, The capacitor is fixed inside the capacitor casing by a potting process.

9. A controller, characterized in that, Including the liquid-cooled capacitor as described in any one of claims 1-8.

10. The controller as claimed in claim 9, characterized in that, The controller also includes a functional module, which is connected to the capacitor housing. The end face of the capacitor housing connected to the functional module is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

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