Capacitive protection assembly, submerged liquid-cooled charging module and charging system

Abstract

The application provides a capacitor protection assembly, an immersed liquid cooling charging module and a charging system, relates to the electric vehicle charging technology field, and is applied to the immersed liquid cooling charging module. The capacitor protection assembly is immersed in the cooling liquid of the immersed liquid cooling charging module. The capacitor protection assembly comprises a circuit board and a circuit unit integrated on the circuit board. The circuit unit at least comprises an electrolytic capacitor. The bottom of the electrolytic capacitor is provided with a conductive interface. The bottom of the electrolytic capacitor is further coated with a sealing layer. The conductive interface is exposed outside the sealing layer. The electrolytic capacitor is installed on the circuit board through the conductive interface. Thus, the sealing performance of the electrolytic capacitor is improved through twice sealing treatment, and the cooling liquid is prevented from leaking into the electrolytic capacitor.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging technology, and in particular to a capacitor protection component, an immersion liquid-cooled charging module, and a charging system. Background Technology

[0002] In the field of electric vehicle charging technology, fully immersed liquid-cooled charging modules are increasingly widely used due to their advantages of efficient heat dissipation and reliable protection. In these charging modules, the PCBA (Printed Circuit Board Assembly) of the power electronic devices is completely immersed in a highly insulating, high-specific-heat coolant (such as mineral oil), whose molecular size is only 1 / 20 to 1 / 30 that of water molecules. As a key component in the charging module, the sealing performance of aluminum electrolytic capacitors faces severe challenges.

[0003] Conventional aluminum electrolytic capacitors use a sealing method where a bottom silicone rubber cover is pressed against the edge of a cylindrical aluminum shell. However, under long-term immersion conditions, oil-based coolants can cause a swelling reaction with the silicone rubber cover, leading to seal failure. Furthermore, due to the extremely small size of coolant molecules and capillary action, even if the cover is made of an oil-resistant material, coolant can still seep into the capacitor through prolonged immersion, diluting the electrolyte and resulting in increased leakage current, increased losses, and even capacitor failure.

[0004] In existing technologies, such as the technical solution disclosed in prior art CN221668687U, the problem of reaction with mineral oil is solved by setting a Teflon protective layer on the rubber stopper or cover of the aluminum electrolytic capacitor. However, this solution does not fully consider the continuous impact of swelling reaction on the sealing structure under long-term immersion, and the risk of coolant seeping into the capacitor still exists. Utility Model Content

[0005] The purpose of this application is to provide a capacitor protection component, an immersion liquid-cooled charging module, and a charging system to solve the technical problems in the prior art that do not fully consider the continuous impact of swelling reaction under long-term immersion on the sealing structure and the risk of coolant seeping into the capacitor.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a capacitor protection component applied to an immersion liquid-cooled charging module. The capacitor protection component is immersed in the coolant of the immersion liquid-cooled charging module. The capacitor protection component includes a circuit board and a circuit unit integrated and mounted on the circuit board. The circuit unit includes at least an electrolytic capacitor. The bottom of the electrolytic capacitor is provided with a conductive interface, and the bottom of the electrolytic capacitor is also coated with a sealing layer. The conductive interface is exposed outside the sealing layer, and the electrolytic capacitor is mounted on the circuit board through the conductive interface.

[0008] Optionally, the electrolytic capacitor includes: a housing, a cover plate, a battery cell, and an electrolyte. The battery cell is integrated within the housing and immersed in the electrolyte within the housing. The cover plate is sealed and pressed against the opening edge of the housing. The conductive interface is fixedly disposed on a first side of the cover plate facing away from the electrolyte. The cover plate is also provided with a connecting component penetrating the first side and a second side facing away from the first side. The conductive interface is connected to the connecting portion of the battery cell through the connecting component. The sealing layer is coated on the side of the cover plate where the conductive interface is located.

[0009] Optionally, the thickness of the sealing layer is greater than the thickness of the connecting assembly protruding from the cover plate.

[0010] Optionally, the bottom of the electrolytic capacitor is further provided with a sealant-protecting component and a sealant filled in the space enclosed by the sealant-protecting component.

[0011] Optionally, the sealant used in the sealing layer and the sealant used in the protective barrier are different.

[0012] Optionally, the shape of the adhesive-blocking protective member matches the mounting shape of the bottom of the electrolytic capacitor on the circuit board, and the area enclosed by the adhesive-blocking protective member is larger than the coverage area of ​​the mounting shape of the bottom of the electrolytic capacitor.

[0013] Optionally, each of the electrolytic capacitors is provided with a protective adhesive at its bottom.

[0014] Optionally, at least two electrolytic capacitors mounted on the same preset area on the circuit board share the same adhesive backing.

[0015] Secondly, embodiments of this application provide an immersion liquid-cooled charging module, comprising: a sealed housing, a capacitor protection component fixedly disposed within the sealed housing, and a coolant immersing the capacitor protection component within the sealed housing; an outlet port and an inlet port are also provided outside the sealed housing, and the capacitor protection component is the capacitor protection component described in any of the first aspects above.

[0016] Thirdly, embodiments of this application provide a charging system, which includes at least the capacitor protection component described in any of the first aspects above.

[0017] This application provides a capacitor protection component, an immersion liquid-cooled charging module, and a charging system, relating to the field of electric vehicle charging technology. The capacitor protection component is applied to an immersion liquid-cooled charging module, and is immersed in the coolant of the module. The component can be composed of a circuit board and circuit units integrated onto the board, with each unit consisting of at least an electrolytic capacitor. The electrolytic capacitor has a conductive interface at its bottom, and a sealing layer is coated thereon to directly prevent coolant from seeping into the capacitor through capillary action or swelling reaction, thus avoiding electrolyte dilution or chemical reactions and reducing the risk of increased leakage current and losses. The conductive interface is exposed outside the sealing layer, and the electrolytic capacitor is mounted on the circuit board through this interface. This ensures effective conductivity between the capacitor and the circuit board while the sealing layer seals the gaps around the interface, preventing coolant from seeping into the circuit board or capacitor from the solder joints, thus balancing conductivity and sealing. Therefore, this application protects the electrolytic capacitor, reduces accidents such as local overheating and output performance degradation of the immersion liquid-cooled charging module caused by electrolytic capacitor failure, extends the service life and operational reliability of the entire immersion liquid-cooled charging module, and indirectly reduces maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of a circuit unit provided in an embodiment of this application. Figure 1 ;

[0021] Figure 3 A schematic diagram of the structure of a circuit unit provided in an embodiment of this application. Figure 2 ;

[0022] Figure 4 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 2 ;

[0023] Figure 5 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 3 ;

[0024] Figure 6 This is a schematic diagram of the structure of an immersion liquid-cooled charging module provided in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of a charging system provided in an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] 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.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 application based on the specific circumstances.

[0032] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] To better understand the solutions provided in the embodiments of this application, the following detailed description of a capacitor protection component, an immersion liquid-cooled charging module, and a charging system provided in the embodiments of this application will be provided in conjunction with the accompanying drawings.

[0034] Figure 1 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 1 .like Figure 1 As shown, the capacitor protection component 100 is applied to an immersion liquid-cooled charging module, and is immersed in the coolant of the immersion liquid-cooled charging module. Specifically, the capacitor protection component 100 is completely immersed in the coolant of the immersion liquid-cooled charging module. The coolant can be selected according to actual conditions; for example, the coolant can be a highly insulating medium such as mineral oil. The capacitor protection component 100 can directly serve the liquid cooling environment of the electric vehicle charging module and needs to withstand long-term immersion in the coolant.

[0035] The capacitor protection component 100 may include a circuit board 110 and a circuit unit 120 integrated on the circuit board 110. The circuit board 110 may be a PCB (Printed Circuit Board), which serves as a carrier, providing circuit connections and structural support.

[0036] in, Figure 2 A schematic diagram of the structure of a circuit unit provided in an embodiment of this application. Figure 1 .like Figure 2 As shown, circuit unit 120 includes at least: electrolytic capacitor 121.

[0037] The electrolytic capacitor 121 has a conductive interface 122 at its bottom, and a sealing layer 130 is also coated on the bottom of the electrolytic capacitor 121. The conductive interface 122 is exposed outside the sealing layer 130 to ensure conductivity. The electrolytic capacitor 121 is mounted on the circuit board 110 through the conductive interface 122. This conductive interface is typically a metal terminal used to achieve electrical connection (e.g., soldering) between the electrolytic capacitor 121 and the circuit board 110. The electrolytic capacitor 121 can be selected according to the actual situation; for example, it can be an aluminum electrolytic capacitor. The sealing layer 130 is coated on the bottom of the electrolytic capacitor 121 (excluding the conductive interface) to form a targeted sealing protection for the electrolytic capacitor 121.

[0038] The electrolytic capacitor 121 is soldered to the circuit board 110 via a conductive interface 122 at the bottom. The non-interface area at the bottom is sealed by a sealing layer 130, limiting the contact between the electrolytic capacitor 121 and the coolant to non-critical areas. Only the conductive interface 122 is connected to the circuit board 110 via solder points. The electrolytic capacitor 121 can be an aluminum electrolytic capacitor.

[0039] Among them, the sealing layer 130 is made of oil-resistant adhesive material, which can withstand long-term immersion in coolant and will not swell or chemically react with coolant, ensuring the durability of sealing performance and solving the problem that conventional sealing materials are prone to failure in small molecule coolant.

[0040] The capacitor protection component provided in this application is applied to an immersion liquid-cooled charging module. This component is immersed in the coolant of the immersion liquid-cooled charging module. The component can be composed of a circuit board and circuit units integrated onto the circuit board, with each circuit unit consisting of at least an electrolytic capacitor. The bottom of the electrolytic capacitor has a conductive interface and is coated with a sealing layer to directly prevent coolant from seeping into the electrolytic capacitor through capillary action or swelling reaction, thus avoiding electrolyte dilution or chemical reactions and reducing the risk of increased leakage current and losses. The conductive interface is exposed outside the sealing layer, and the electrolytic capacitor is mounted on the circuit board through this interface. This ensures effective conductivity between the electrolytic capacitor and the circuit board while the sealing layer seals the gaps around the interface, preventing coolant from seeping into the circuit board or the electrolytic capacitor from the solder joints, thus balancing conductivity and sealing. Therefore, this application protects the electrolytic capacitor, reduces accidents such as local overheating and output performance degradation of the immersion liquid-cooled charging module caused by electrolytic capacitor failure, extends the service life and operational reliability of the entire immersion liquid-cooled charging module, and indirectly reduces maintenance costs.

[0041] Figure 3 A schematic diagram of the structure of a circuit unit provided in an embodiment of this application. Figure 2 .like Figure 2As shown, the electrolytic capacitor 121 includes: a housing 123, a cover plate 124, a battery cell 125, and an electrolyte 126.

[0042] The battery cell 125 is integrated inside the housing 123 and immersed in the electrolyte inside the housing 123. The cover plate 124 is sealed and pressed against the opening edge of the housing 123. The conductive interface 122 is fixedly installed on the first side of the cover plate 124 away from the electrolyte 126. The cover plate 124 is also provided with a connecting component 127 that penetrates the first side and the second side away from the first side. The conductive interface is connected to the connecting part of the battery cell 125 through the connecting component 127. The sealing layer 130 is coated on the side of the cover plate 124 where the conductive interface 122 is located.

[0043] The housing 123 is typically a rigid structure such as an aluminum shell to form a closed space to house the battery cell 125 and the electrolyte 126. The cover plate 124 is sealed to the opening edge of the housing 123 by pressing, such as pressing the cover plate against the edge of an aluminum shell, to prevent direct communication between the interior of the housing 123 and the external environment, protecting the battery cell 125 and the electrolyte 126 from external contamination. The material of the housing 123 can be selected according to the actual situation. For example, the material of the housing 123 can be an aluminum shell.

[0044] It should be noted that because the cover plate 124 is made of oil-resistant materials, due to the extremely small molecular size and capillary action of oil, coolant can easily penetrate the aluminum electrolytic capacitor 121 through long-term immersion, damaging the electrolyte 126, leading to increased leakage current, increased losses, and capacitor failure. Therefore, a sealing layer 130 is coated on top of the cover plate 124 to prevent coolant from easily contacting the cover plate 124 during long-term immersion, thus preventing swelling reactions and increasing the sealing path, reducing capillary action. Furthermore, the sealing layer 130 uses oil-resistant adhesives, such as epoxy or polyurethane, which are less likely to swell with the coolant, reducing the risk of cover plate 124 sealing failure from the outset.

[0045] Among them, the battery cell 125 is the core component that realizes the function of the electrolytic capacitor 121. It can be composed of electrode foil, etc., and is immersed in the electrolyte 126 in the housing 123. Charge storage and release are realized through the electrolyte 126.

[0046] The connecting component 127 penetrates the first side (i.e., away from the electrolyte 126) and the second side (facing the electrolyte 126) of the cover plate. It is an electrical bridge between the conductive interface 122 and the battery cell 125, such as a metal pin or conductive terminal, to ensure that the electrical signal of the battery cell 125 can be transmitted to the outside. The connecting component 127 can be selected according to the actual situation. For example, the connecting component 127 can be selected as a cow horn.

[0047] The conductive interface 122 is fixed on the first side of the cover plate 124 (facing away from the electrolyte 126), and is electrically connected to the connection part (such as the electrode lead-out end) of the cell 125 through the connecting component 127. Finally, it is used to solder to the circuit board 110 to realize the electrical conduction between the electrolytic capacitor 121 and the external circuit.

[0048] It should be noted that the sealing layer 130 is applied to the first surface of the cover plate 124 (i.e., the surface where the conductive interface 122 is located), and must avoid the conductive interface 122 to ensure that the conductive interface 122 is exposed for welding. This means that the sealing layer 130 directly covers the pressing edge between the cover plate 124 and the housing 123, i.e., the edge area of ​​the first surface of the cover plate 124, the gap through which the connecting component 127 penetrates the cover plate 124, and other weak sealing points.

[0049] The capacitor protection assembly provided in this application comprises an electrolytic capacitor consisting of a housing, a cover plate, a battery cell, and an electrolyte. The battery cell is integrated within the housing and immersed in the electrolyte. The cover plate is sealed and pressed against the opening edge of the housing. A conductive interface is fixedly located on the first side of the cover plate facing away from the electrolyte. The cover plate also has a connecting component penetrating the first side and the second side facing away from the first side. The conductive interface is connected to the battery cell through the connecting component. A sealing layer is coated on the side of the cover plate where the conductive interface is located. Since the pressing edge between the cover plate and the housing is a weak point in conventional sealing, it is prone to coolant penetration due to swelling reaction or capillary action. The gap where the connecting component penetrates the cover plate is another potential leakage channel. The sealing layer, coated on the first side of the cover plate, precisely covers these weak points, forming a secondary sealing barrier that blocks the path of coolant seeping into the housing through the pressing edge or the through gap, preventing the electrolyte from being diluted or contaminated. Meanwhile, the sealing layer only covers the non-conductive interface area on the first side of the cover plate, ensuring that the conductive interface is exposed. This guarantees effective soldering of the electrolytic capacitor to the circuit board, ensuring reliable electrical connection, while also sealing the gaps around the conductive interface to prevent coolant from seeping back from the solder joint into the cover plate or housing. This achieves compatibility between sealing protection and electrical conductivity. Therefore, by blocking coolant penetration and inhibiting swelling reactions, this application effectively avoids contamination of the battery cell and electrolyte, reducing problems such as increased capacitor leakage current, increased losses, and capacity decay. This extends the service life of the electrolytic capacitor in a fully immersion liquid-cooled environment, thereby ensuring the stable operation of the entire immersion liquid-cooled charging module.

[0050] Optionally, based on the above Figure 2 and Figure 3 The thickness of the sealing layer 130 is greater than the thickness of the connecting assembly 127 protruding from the cover plate 124. That is, the thickness of the sealing layer 130 is sufficient to cover the connecting assembly 127 protruding from the cover plate 124.

[0051] It should be noted that the thickness of the sealing layer 130 can be selected according to the actual situation. For example, the thickness of the sealing layer 130 can be selected as 2mm to 3mm.

[0052] The capacitor protection component provided in this application has a sealing layer thickness greater than the thickness of the protruding cover plate of the connecting component. This makes it difficult for the coolant to come into contact with the cover plate when the electrolytic capacitor is immersed for a long time, thereby preventing swelling reaction and increasing the sealing path, thus reducing the occurrence of capillary phenomenon.

[0053] Optionally, continue to refer to the above. Figure 1 At the bottom of the electrolytic capacitor 121, a sealant 140 is provided, and a sealant 150 is filled in the space surrounding the sealant 140.

[0054] The sealant-blocking protective component 140 is typically a ring-shaped, frame-shaped, or structural component that matches the bottom contour of the electrolytic capacitor 121. The sealant-blocking protective component 140 is typically made of oil-resistant materials such as PA (Polyamide) or PE (Polyethylene) and is disposed between the bottom of the electrolytic capacitor 121 and the circuit board 110. Its function is to form a physical barrier around the electrolytic capacitor 121, limit the filling range of the sealant 150, and prevent the sealant 150 from overflowing into non-protected areas, such as other devices or conductive lines on the circuit board 110.

[0055] It should be noted that the height of the adhesive-blocking protective component 140 can be 1 / 3 or 1 / 4 of the height of the electrolytic capacitor 121, with a preset gap of approximately 5mm from the bottom edge of the electrolytic capacitor 121. This preset gap can be selected according to the actual situation. The adhesive-blocking protective component 140 can also be 10mm high and 1.5mm thick, while maintaining the same 5mm installation distance from the bottom edge of the electrolytic capacitor 121.

[0056] The sealant 150 is used to pot and seal the space enclosed by the protective sealant 140, covering the connection area between the bottom of the electrolytic capacitor 121 and the circuit board 110, such as the solder joints of the conductive interface and the edge of the sealing layer 130. The sealant 150 can be selected according to the actual situation. For example, the sealant 150 can be epoxy resin, polyurethane resin, two-component AB adhesive, or specially treated silicone adhesive.

[0057] The assembly logic is as follows: After the electrolytic capacitor 121 is mounted on the circuit board 110 through the bottom conductive interface 122, a protective shield 140 is first installed around its bottom perimeter. Then, sealant 150 is injected into the space surrounded by the protective shield 140. After the sealant 150 cures, a sealed structure is formed that covers the connection between the bottom of the electrolytic capacitor 121 and the circuit board 110. The sealant 150 does not react adversely with the protective shield 140 or the circuit board 110.

[0058] The capacitor protection assembly provided in this application includes a sealant-blocking protective component at the bottom of the electrolytic capacitor, and sealant encapsulated within the space surrounding the sealant-blocking protective component. This allows the sealant-blocking protective component to physically limit the filling range of the sealant, preventing it from overflowing onto other components, conductive lines, or solder joints on the circuit board. This avoids problems such as short circuits and device malfunction interference caused by sealant coverage, while also reducing the amount of sealant used and lowering manufacturing costs. Furthermore, the cured sealant possesses a certain degree of elasticity, which can buffer the stress generated by vibration and temperature changes during the operation of the immersion liquid-cooled charging module, reducing fatigue damage to the conductive interface solder joints. It also prevents protective failure due to stress cracking of the sealing layer, thus balancing mechanical protection and sealing performance. Therefore, the adhesive-blocking protective component of this application, in conjunction with the sealant, forms a surrounding sealed space at the bottom of the electrolytic capacitor, covering areas not fully covered by the sealing layer, such as welding gaps of conductive interfaces and gaps between the bottom of the electrolytic capacitor and the circuit board. This isolates the electrolytic capacitor from contact with the coolant outside the sealant, blocking all potential paths for coolant to penetrate through tiny gaps. Compared to a single sealing layer, this provides more comprehensive protection and improves the capacitor protection component's anti-leakage capability, structural stability, and adaptability in a fully immersed liquid-cooled environment.

[0059] Optionally, the sealant of the sealing layer 130 and the sealant used to fill the protective element 140 are different.

[0060] The sealant used for sealing layer 130 can be an oil-resistant adhesive such as epoxy, polyurethane, or two-component AB adhesive. The sealant used for the protective barrier 140 can also be an oil-resistant adhesive such as epoxy, polyurethane, two-component AB adhesive, or specially treated silicone. However, it is important to emphasize that the sealant used for sealing layer 130 and the sealant used for protective barrier 140 are different. This is to avoid compatibility issues that may arise from prolonged immersion of similar materials in coolant, such as molecular migration and swelling. The two sealant layers form complementary protection, further enhancing the long-term stability of the sealing structure.

[0061] Optionally, continue to refer to the above. Figure 1 The shape of the adhesive shield 140 matches the mounting shape of the bottom of the electrolytic capacitor 121 on the circuit board 110, and the area enclosed by the adhesive shield 140 is larger than the coverage area of ​​the bottom mounting shape of the electrolytic capacitor 121.

[0062] Furthermore, for the dual or multiple electrolytic capacitor layout on the circuit board 110, the shape of the customized adhesive shield 140, such as matching the outline of the electrolytic capacitor array, can be used to achieve centralized potting protection for multiple electrolytic capacitors, simplifying the process while ensuring the consistency of batch protection and improving the overall reliability of the immersion liquid-cooled charging module.

[0063] The capacitor protection component provided in this application has a shape that matches the mounting shape of the bottom of the electrolytic capacitor on the circuit board, and the area enclosed by the adhesive shield is larger than the coverage area of ​​the bottom mounting shape of the electrolytic capacitor. Therefore, the capacitor protection component of this application can achieve potting protection for the electrolytic capacitor, improving the overall reliability of the immersion liquid-cooled charging module.

[0064] Figure 4 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 2 . Figure 5 A schematic diagram of the structure of a capacitor protection component provided in this application embodiment. Figure 3 .like Figure 4 and Figure 5 as well as Figure 1 As shown, each electrolytic capacitor 121 may be provided with a protective adhesive 140 at its bottom.

[0065] In one possible implementation, for each individual electrolytic capacitor 121, a separate adhesive-resistant shield 140 can be configured on its bottom (the connection area with the circuit board 110). This adhesive-resistant shield 140 is typically a ring-shaped structure matching the bottom contour of the individual electrolytic capacitor 121, made of an oil-resistant material such as PA or PE, with its inner boundary conforming to a predetermined distance from the bottom edge of the electrolytic capacitor 121, and its outer side fixed to the surface of the circuit board 110, forming an independent space that surrounds only the bottom of that single electrolytic capacitor 121 (see reference). Figure 1 ), used to define the filling range of subsequent potting compound.

[0066] The capacitor protection assembly provided in this application allows for the installation of a protective sealant at the bottom of each electrolytic capacitor. This addresses the slight variations in the location and dimensions of weak points at the bottom of each capacitor, such as the pressing edge between the cover and the casing, the weld gap of the conductive interface, and the edge of the sealing layer, due to individual differences. The individually installed protective sealant precisely surrounds the weak areas of the electrolytic capacitor, ensuring that the potting compound completely covers these risk points, thus improving the sealing reliability of a single electrolytic capacitor.

[0067] Optionally, continue to refer to the above. Figure 4 and Figure 5 At least two electrolytic capacitors 121 mounted on the same preset area on the circuit board 110 share the same adhesive backing 140 at their bottoms.

[0068] The bottom of the electrolytic capacitor 121 is coated with a sealing layer 130. The conductive interface 122 of the electrolytic capacitor 121 is soldered to the circuit board 110. For at least two electrolytic capacitors 121, the same protective part 140 can be made according to the shape of multiple electrolytic capacitors 121 mounted on the circuit board 110, thereby forming a continuous closed space. Its boundary covers all the bottom edges and adjacent gaps of the electrolytic capacitors 121, which is used to uniformly limit the filling range of the potting compound and realize the centralized protection of multiple capacitors in this area.

[0069] It should be noted that at least two electrolytic capacitors 121 may be of different or the same type.

[0070] The capacitor protection assembly provided in this application allows at least two electrolytic capacitors mounted on the same predetermined area on a circuit board to share the same protective adhesive at their bottoms. Therefore, by having multiple capacitors in the same area share a single protective adhesive, the number of protective components required is reduced, thus minimizing the space occupied on the circuit board surface. This also simplifies the installation process, making it suitable for automated mass production and reducing assembly time and labor costs.

[0071] Figure 6 This is a schematic diagram of the structure of an immersion liquid-cooled charging module provided in an embodiment of this application. Figure 6 As shown, the immersion liquid-cooled charging module 200 may include: a sealed housing 210, a capacitor protection component 100 fixedly disposed in the sealed housing 210, and a coolant 220 in the sealed housing 210 that is immersed in the capacitor protection component 100; an outlet port 230 and an inlet port 240 are also provided outside the sealed housing 210.

[0072] The sealed housing 210, serving as the external container for the entire immersion liquid-cooled charging module 200, is typically made of metal or high-strength plastic, such as an aluminum shell. This sealed housing 210 provides excellent sealing to prevent coolant 220 leakage. Its internal space is designed to completely accommodate the capacitor protection assembly 100 and is isolated from the outside environment through a sealed structure. The capacitor protection assembly 100 is installed within the sealed housing 210.

[0073] Coolant 220 fills the sealed housing 210, completely submerging the capacitor protection assembly 100. Coolant 220 must possess high insulation to prevent short circuits; high specific heat capacity to efficiently absorb heat; and chemical stability to avoid reacting with the component materials. Its molecular size is typically only 1 / 20 to 1 / 30 the size of a water molecule (e.g., mineral oil-based media). This ultra-small molecular size makes it difficult for conventional sealing methods to effectively block it. Taking aluminum electrolytic capacitors in power electronic devices as an example, their conventional sealing method is achieved by pressing a silicone rubber cover at the bottom against the edge of a cylindrical aluminum shell. However, in a fully submerged liquid-cooled environment, when the aluminum electrolytic capacitor is immersed in mineral oil-based coolant for a long time, the oil medium will undergo a swelling reaction with the silicone rubber cover. If coolant molecules penetrate into the cover material, the cover will expand in volume and become structurally loose, ultimately causing the seal between the cover and the aluminum shell to fail, allowing coolant 220 to penetrate into the capacitor. The capacitor protection component 100 provided in this application, by coating its bottom with a sealing layer 130, can directly cover the weak sealing areas such as the pressing edge of the silicone rubber cover plate 124 and the aluminum shell 123, reducing direct contact between the cover plate 124 and the coolant 220. Furthermore, a sealant-blocking protective component 140 is provided at the bottom of the electrolytic capacitor 121, and sealant 150 is filled within the space enclosed by the sealant-blocking protective component 140, further improving the sealing performance of the electrolytic capacitor 121 and preventing oil-based coolant 220 from leaking into the capacitor. This reduces the probability of swelling reactions from the source and effectively compensates for the shortcomings of conventional sealing methods when dealing with small-molecule coolants.

[0074] The outlet port 230 and the inlet port 240 are located outside the sealed housing 210 and are respectively connected to the circulation system of the coolant 220. The inlet port 240 is used to inject low-temperature coolant, and the outlet port 230 is used to discharge high-temperature coolant after absorbing heat, forming a coolant circulation path to achieve continuous heat dissipation. Both the outlet port 230 and the inlet port 240 are equipped with outlet temperature detection modules and inlet temperature detection modules, respectively.

[0075] The immersion liquid-cooled charging module provided in this application comprises a sealed housing, a capacitor protection component fixedly disposed within the sealed housing, and a coolant immersing the capacitor protection component within the sealed housing; an outlet port and an inlet port are also provided outside the sealed housing. Thus, the immersion liquid-cooled charging module of this application, through its integrated sealing structure and efficient liquid cooling circulation, improves heat dissipation efficiency, reliability, and power density while also achieving a compact structure and environmental friendliness.

[0076] Figure 7 This is a schematic diagram of a charging system provided in an embodiment of this application. Figure 7 As shown, the charging system 300 includes at least: a capacitor protection component 100.

[0077] The charging system provided in this application can be composed of at least a capacitor protection component. That is, the electrolytic capacitor, as a key energy storage component in the charging system, directly affects the performance of the charging system. The capacitor protection component, through a multi-layer sealing design, such as a bottom sealing layer and potting compound, can prevent coolant infiltration that could lead to electrolytic capacitor failure, significantly reducing the risk of downtime caused by electrolytic capacitor failure and thus improving the lifespan of the charging system.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A capacitor protection component, characterized in that, The capacitor protection component is applied to an immersion liquid-cooled charging module, wherein the capacitor protection component is immersed in the coolant of the immersion liquid-cooled charging module. The capacitor protection assembly includes: a circuit board, and a circuit unit integrated on the circuit board, wherein the circuit unit includes at least: an electrolytic capacitor; wherein, the bottom of the electrolytic capacitor is provided with a conductive interface, the bottom of the electrolytic capacitor is also coated with a sealing layer, the conductive interface is exposed outside the sealing layer, and the electrolytic capacitor is mounted on the circuit board through the conductive interface.

2. The capacitor protection assembly according to claim 1, characterized in that, The electrolytic capacitor includes: a housing, a cover plate, a battery cell, and an electrolyte. The battery cell is integrated inside the housing and immersed in the electrolyte within the housing. The cover plate is sealed and pressed against the opening edge of the housing. The conductive interface is fixedly disposed on a first side of the cover plate facing away from the electrolyte. The cover plate is also provided with a connecting component that penetrates the first side and a second side facing away from the first side. The conductive interface is connected to the connecting part of the battery cell through the connecting component. The sealing layer is applied to the side of the cover plate where the conductive interface is located.

3. The capacitor protection assembly according to claim 2, characterized in that, The thickness of the sealing layer is greater than the thickness of the connecting assembly protruding from the cover plate.

4. The capacitor protection assembly according to claim 1, characterized in that, The bottom of the electrolytic capacitor is also provided with a sealant shield and a sealant filled in the space surrounded by the sealant shield.

5. The capacitor protection assembly according to claim 4, characterized in that, The sealant used in the sealing layer is different from the sealant used in the protective barrier.

6. The capacitor protection assembly according to claim 4, characterized in that, The shape of the adhesive-blocking protective component matches the mounting shape of the bottom of the electrolytic capacitor on the circuit board, and the area enclosed by the adhesive-blocking protective component is larger than the coverage area of ​​the mounting shape of the bottom of the electrolytic capacitor.

7. The capacitor protection assembly according to claim 4, characterized in that, Each of the electrolytic capacitors is provided with a protective rubber seal at its bottom.

8. The capacitor protection assembly according to claim 4, characterized in that, At least two electrolytic capacitors installed in the same preset area on the circuit board share the same adhesive backing.

9. An immersion liquid-cooled charging module, characterized in that, include: The sealed housing, the capacitor protection component fixedly disposed within the sealed housing, and the sealed housing further containing a coolant immersing the capacitor protection component; the sealed housing is further provided with an outlet port and an inlet port, and the capacitor protection component is the capacitor protection component described in any one of claims 1-8.

10. A charging system, characterized in that, At least including: The capacitor protection component according to any one of claims 1-8.

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