Water-cooled fast charging device integrated with pre-charging unit

Abstract

This invention relates to a water-cooled fast charging device with an integrated pre-charge unit. The device includes a main body and, from the inside out, an insulating film, a thermal pad, and a water-cooling plate sequentially attached to the bottom of the main body. The main body includes a housing and a pre-charge unit, contactors, fuses, a shunt, and a PCBA housed within the housing. The contactors include a main positive contactor and a main negative contactor. The pre-charge unit is connected in parallel with the main positive contactor and is disposed between the fuse and the shunt. The main contacts of the contactors are connected to bent copper busbars. Both ends of the fuse and the shunt are fixed to the housing by thermal blocks. The bent copper busbars and thermal blocks protrude from the bottom of the housing and are attached to the insulating film. Compared with existing technologies, the pre-charge unit of this invention can directly reuse the original water-cooling system and main control circuit of the fast charging device, eliminating the need for additional independent heat dissipation components and control modules. While ensuring the stability of high-power fast charging operation, it significantly improves the overall integration and space utilization.

Description

Technical Field

[0001] This invention relates to the field of charging equipment technology, and in particular to a water-cooled fast charging device with an integrated pre-charging unit. Background Technology

[0002] With the rapid development of 800V high-voltage platforms and high-power DC supercharging technology for new energy vehicles, the high-voltage power distribution architecture of the entire vehicle is evolving towards higher integration, miniaturization, and lower wiring complexity. Existing on-board water-cooled fast charging devices typically contain high-voltage fuses, shunts, main contactors, and PCBA main control boards, which only realize DC power conversion and fast charging circuit switching functions, and do not have pre-charging functions themselves.

[0003] Currently, in conventional industry designs, the pre-charge unit is often independently located within the battery pack BDU or the vehicle's high-voltage PDU distribution box, adopting a separate layout from the water-cooled fast charging device. This traditional separate architecture has several drawbacks: First, it requires a separate pre-charge module and mounting bracket, occupying valuable space in the vehicle chassis and engine compartment, which is not conducive to a compact vehicle architecture design; second, the separate layout requires a large number of external high-voltage wiring harnesses and connectors, resulting in numerous high-voltage connection nodes, which are prone to reliability issues such as loose connections, overheating, and high-voltage arcing, and the overall vehicle wiring complexity and weight are both high; third, the separate structure cannot share the water-cooling resources of the fast charging device, and the pre-charge unit needs to be configured with a separate cooling structure, resulting in redundant and costly overall cooling solutions; fourth, the pre-charge and fast charging belong to different control units, resulting in poor timing coordination, large communication delays, and insufficient closed-loop logic for high-voltage power-on safety.

[0004] Adding an independent pre-charge unit externally to an existing fast-charging device presents several challenges, including poor cavity compatibility, messy high-voltage wiring, difficulty in managing EMC interference, and lack of unified heat dissipation. Conversely, integrating the pre-charge unit directly into a water-cooled fast-charging device presents technical drawbacks such as high heat density from heat sources within the cavity, increased difficulty in insulation and creepage design due to dense high-voltage components, easy cascading of faults, inconvenient maintenance and disassembly, and limited product platform versatility. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by providing a water-cooled fast charging device with an integrated pre-charge unit, thereby improving the overall integration and space utilization.

[0006] In a first aspect, this application provides a water-cooled fast charging device with an integrated pre-charge unit, comprising a device body and an insulating film, a thermal pad, and a water-cooling plate sequentially attached from the inside to the outside of the bottom of the device body; the device body includes a housing and a pre-charge unit, a contactor, a fuse, a shunt, and a PCBA disposed within the housing; the contactor includes a main positive contactor and a main negative contactor; the pre-charge unit is connected in parallel with the main positive contactor and is disposed together between the fuse and the shunt; the main contacts of the contactor are connected to a bent copper busbar; both ends of the fuse and the shunt are respectively fixed in the housing by thermal blocks; the bent copper busbar and the thermal blocks are exposed from the bottom of the housing and attached to the insulating film.

[0007] Furthermore, the pre-charge unit includes: The housing has two high-voltage terminals at one end and two low-voltage terminals at the opposite end. A pre-charge relay is disposed in the housing. The common terminal of the pre-charge relay is connected to one of the high-voltage terminals, and the two control terminals of the pre-charge relay are respectively connected to the two low-voltage terminals. A pre-charge resistor is disposed in the housing alongside the pre-charge relay. One terminal of the pre-charge resistor is connected to the normally open terminal of the pre-charge relay, and the other terminal of the pre-charge resistor is connected to another high-voltage terminal. The precharge relay is connected to the precharge resistor, the high-voltage terminal, and the low-voltage terminal, and the precharge resistor is connected to the high-voltage terminal via a clamping copper busbar.

[0008] Furthermore, the precharge relay and the precharge resistor are each encased in an independent insulating protective shell.

[0009] Furthermore, the high-voltage terminal and the low-voltage terminal are both integrally integrated with the clamping copper busbar.

[0010] Furthermore, each end of the clamping copper busbar is provided with a claw, and the housing is provided with an opening at each claw.

[0011] Furthermore, the housing is provided with a limiting stop that matches the outer contour of the precharge relay.

[0012] Furthermore, the outer casing includes an upper cover and a base that interlock and enclose to each other to form an installation cavity. The precharge unit, contactor, fuse, and shunt are all installed in the base and located below the PCBA. The insulating film is attached to the bottom outer wall of the base.

[0013] Furthermore, the PCBA integrates a component control unit, a communication unit, a voltage acquisition unit, and a current acquisition unit.

[0014] Furthermore, the water-cooled plate includes a liquid inlet and two liquid outlets, with the two liquid outlets respectively located on two different sides of the water-cooled plate.

[0015] Furthermore, the side of the housing has a gap for external cables, and a protective cover is provided in the gap.

[0016] Compared with the prior art, the beneficial effects of the present invention include: 1. By integrating the pre-charge unit into the fast charging device, the original water-cooling heat dissipation system and main control circuit of the fast charging device can be directly reused. There is no need to configure additional independent heat dissipation components and control modules. This simplifies the high-voltage circuit layout, reduces external wiring and fault contacts, and can efficiently control the temperature rise during pre-charge by utilizing mature water-cooling conditions. Simultaneously, it can achieve precise linkage of high-voltage power-on sequence. While ensuring the stability of high-power fast charging operation, it significantly improves the integration and space utilization of the whole machine.

[0017] 2. The fast charging device adopts a targeted direct cooling method, which has a heat exchange efficiency 5 to 10 times that of air cooling. The coolant directly contacts the core heat sources of the device such as contactor contacts, shunt, copper busbar, and fuse through the water cooling plate, resulting in extremely low thermal resistance and high thermal conductivity. Under high current conditions, it avoids overheating and power reduction, and triggers protection, thus achieving the purpose of rapid heat dissipation.

[0018] 3. The device adopts a wireless design, which reduces messy wiring, makes the layout neat, reduces the risk of poor contact, cold solder joints and broken wires, and reduces assembly steps. It has the advantages of saving space, reducing production costs, improving production efficiency and reliability.

[0019] 4. This pre-charge unit makes full use of three-dimensional space, and designs the pre-charge relay and pre-charge resistor into a small and universal pre-charge module component through quick-connect method, which facilitates the miniaturization design of the device. Attached Figure Description

[0020] Figure 1 This is an exploded view of the overall structure of the water-cooled fast charging device with integrated pre-charge unit in the embodiment.

[0021] Figure 2 This is an exploded view of the overall structure of the integrated pre-charge unit in the embodiment.

[0022] Figure 3 This is a schematic diagram of the integrated pre-charge unit in the embodiment.

[0023] Figure 4 This is a structural schematic diagram of the integrated precharge unit from another angle in the embodiment.

[0024] Figure 5 This is a schematic diagram of the component connections of the integrated precharge unit in the embodiment.

[0025] Figure 6 This is a schematic diagram of the component connections of the integrated precharge unit in the embodiment from another angle.

[0026] Figure 7 This is a schematic diagram of the upper shell structure of the integrated pre-charge unit in the embodiment.

[0027] Figure 8 This is a schematic diagram of the lower shell structure of the integrated pre-charge unit in the embodiment.

[0028] Reference numerals: 1-Top cover; 2-Protective cover; 3-PCBA; 4-Contaminant; 5-Base; 6-Insulating film; 7-Heat conductive pad; 8-Water cooling plate; 9-Shuntmer; 10-Fuse; 11-Upper shell; 12-Pre-charge relay; 13-Pre-charge resistor; 14-Lower shell; 15-High voltage terminal; 16-Low voltage terminal; 17-Pre-charge resistor protective shell; 18-Clamping copper busbar; 19-Claw; 20-Pre-charge relay protective shell; 21-Common terminal; 22-Normally open terminal; 23-Control terminal; 24-Protruding rib; 25-Limit stop. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0030] like Figure 1 As shown, this application proposes a water-cooled fast charging device with an integrated pre-charge unit, including a device body and an insulating film 6, a thermal pad 7, and a water-cooling plate 8 sequentially attached from the inside to the outside of the bottom of the device body. The device body includes a housing and a pre-charge unit, a contactor 4, a fuse 10, a shunt 9, and a PCBA 3 disposed within the housing. The contactor 4 includes a main positive contactor and a main negative contactor. The pre-charge unit is connected in parallel with the main positive contactor and is disposed between the fuse 10 and the shunt 9. The main contacts of the contactor 4 are connected to the bent copper busbar by welding. The bottom surface of the bent copper busbar is exposed from the bottom of the housing to facilitate heat conduction. Due to the shape constraints, the heating components of the fuse 10 and the shunt 9 are fixed to the housing at both ends by thermal blocks. The lower surfaces of the thermal blocks are exposed from the bottom of the housing. The lower surfaces of the bent copper busbar and the thermal blocks are attached to the insulating film 6 and directly contact the water-cooling plate 8 through the thermal pad 7 to dissipate heat.

[0031] This solution eliminates the need for an external, independent pre-charge module and its mounting bracket, reducing the number of components and simplifying the vehicle's high-voltage architecture. The pre-charge unit is embedded within the fast-charging device, eliminating the need for additional space in the vehicle chassis and engine compartment, and is compatible with 800V high-voltage platforms and compact vehicle layouts. Furthermore, the internal copper busbars provide direct connections, eliminating the need for external high-voltage harnesses and adapters, shortening high-voltage wiring, and resulting in a neat and concise overall layout. This fast-charging device utilizes liquid cooling and wireless wiring. In three-dimensional space, the pre-charge unit, fast-charging components, PCBA3, and water-cooled plate 8 are physically connected to form an integrated assembly. During operation, the heat-generating components are in close contact with the water-cooled plate 8, and the heat generated by the high current is rapidly transferred through the central thermal pad 7, achieving rapid heat dissipation.

[0032] In this embodiment, the bent copper busbar is a one-piece injection-molded copper busbar with stable insulation performance, effectively preventing the risks of high-voltage creepage, short circuits, and leakage. The heat-conducting block is made of aluminum alloy, which has a high thermal conductivity and can quickly absorb and dissipate the heat generated by the components, achieving rapid temperature uniformity and directional heat dissipation, and avoiding localized overheating of the shunt 9.

[0033] In this embodiment, the outer casing includes an upper cover 1 and a base 5 that interlock and together form an installation cavity. The pre-charge unit, contactor 4, fuse 10, and shunt 9 are all installed in the base 5 and located below the PCBA 3. An insulating film 6 is attached to the bottom outer wall of the base 5. The interior of the base 5 has mounting slots for mounting components, and the bottom outer side of the base 5 has copper busbar grooves for exposing and bending copper busbars and openings for exposing heat-conducting blocks. The base 5 adopts an integral injection-molded structure with no splicing gaps, resulting in a strong structural rigidity and resistance to deformation. Multiple contactors 4 are arranged in a row in the base 5 along with the pre-charge unit. Fuses 10 and shunts 9 are also arranged in another row in the base 5, parallel to the contactors 4. This compact component layout effectively reduces internal space and achieves overall miniaturization. It also shortens electrical connection paths, reducing circuit losses and electromagnetic interference. The centralized arrangement of heat-generating components facilitates the matching of targeted direct cooling structures, balancing the operating temperature of each component and improving the overall operational stability and integration of the equipment. A gap is provided on the side of the fast-charging device's casing for external cables. Since the high-voltage copper busbars and terminals experience high temperature rise during operation, this gap creates a natural convection cooling channel, effectively dissipating localized heat and reducing the temperature rise of the copper busbars and terminals, preventing overheating and aging. This gap also facilitates the alignment and installation of copper busbars and the securing of wiring bolts during production and assembly. Furthermore, during later maintenance and repair, the wiring status can be directly observed and the wiring can be operated without completely disassembling the casing. A removable protective cover 2 is installed in the gap on the side of the outer casing. The protective cover 2 is connected to the upper cover 1. The protective cover 2 can effectively seal the side openings and gaps, preventing dust, moisture and conductive foreign objects from entering the equipment and preventing corrosion, moisture and short circuit risks to the high-voltage copper busbar and wiring terminals. At the same time, the protective cover 2 adopts a shielding non-sealed design, which can retain local convection heat dissipation conditions and does not affect the normal heat dissipation of the heat-generating areas. In addition, the protective cover 2 is easy to install and remove. While achieving all-weather protection, it still retains the operating space for wiring installation and daily maintenance, comprehensively improving the equipment's protection capabilities and operational reliability.

[0034] PCBA3 integrates a component control unit, a communication unit, a voltage acquisition unit, and a current acquisition unit. It features built-in logic control, enabling control and status monitoring of each contactor 4, as well as communication with external devices. It also supports external monitoring and maintenance. In this embodiment, PCBA3 uses nickel sheets as conductive connectors, employing laser welding for the nickel sheet connections. This method ensures stable conductivity, controllable cross-sectional area, and suitability for the high-current operation of fast-charging devices. It is also less prone to overheating and has a smaller voltage drop. Compared to ordinary soldering, the solder joints are more tensile-resistant, vibration-resistant, and less likely to detach. Furthermore, it reduces processing steps and lowers labor costs.

[0035] In this embodiment, the water-cooled plate 8 includes one inlet and two outlets. A single inlet is used for centralized liquid intake, which is then divided into two parallel flow channels internally, ultimately discharging the liquid through two separate outlets located on different sides of the water-cooled plate 8. This dual-outlet, zoned flow design avoids insufficient flow and localized heat accumulation in the far-end channels, adapting to the heat exchange requirements of the high-power fast-charging base 5. The heat-generating areas of the contactor 4, power devices, and copper busbars on the base 5 are dispersed, allowing the dual outlets to correspond to two sets of heat exchange areas, thus separating and removing heat. Furthermore, the dual outlets allow for multi-point venting, reducing air blockage and bubble retention in the flow channels, resulting in more stable coolant circulation. The coolant can be an aqueous solution of ethylene glycol, insulating silicone oil, or other liquids. Preferably, the water-cooled plate 8 can be a microchannel water-cooled plate, internally arranged with numerous dense, fine, and extremely small parallel or array-type narrow flow channels, resulting in extremely high heat exchange efficiency and low thermal resistance.

[0036] like Figure 2-4 As shown, the pre-charge unit includes a housing and a pre-charge relay 12 and a pre-charge resistor 13 disposed within the housing. To improve the overall assembly efficiency of the device, in this embodiment, the pre-charge relay 12 and pre-charge resistor 13 are designed as a small, universal pre-charge unit using a quick-connect method. One end of the housing has two high-voltage terminals 15, and the opposite end has two low-voltage terminals 16. Figure 5 , 6 As shown, the common terminal 21 of the precharge relay 12 is connected to one of the high-voltage terminals 15, and the two control terminals 23 of the precharge relay 12 are respectively connected to two low-voltage terminals 16. One terminal of the precharge resistor 13 is connected to the normally open terminal 22 of the precharge relay 12, and the other terminal of the precharge resistor 13 is connected to the other high-voltage terminal 15. The precharge relay 12, the precharge resistor 13, the high-voltage terminal 15, and the low-voltage terminal 16 are all connected, as are the precharge resistor 13 and the high-voltage terminal 15, through clamping copper busbars 18.

[0037] Both the high-voltage and low-voltage ends of this pre-charge unit are electrically connected using laser welding technology. No additional special production processes or dedicated processing equipment are required. It can directly share existing production line resources, simplifying the production process and significantly improving overall assembly production efficiency and mass production versatility.

[0038] The pre-charge relay 12 and pre-charge resistor 13 are each encased in an independent insulating protective shell, namely the pre-charge relay protective shell 20 and the pre-charge resistor protective shell 17. These two protective shells are mutually isolated, and the heat source of the resistor is individually sealed, preventing direct heating of the relay plastic and coil. This results in a more reasonable thermal environment and reduces the risk of high-temperature failure. Both the pre-charge relay 12 and the pre-charge resistor 13 are high-voltage current-carrying components, and there is a voltage difference and heat generation during operation. Each has its own independent protective shell, which provides basic insulation, creepage protection, and short-circuit protection, preventing interference between exposed conductors inside the devices.

[0039] Both the high-voltage terminal 15 and the low-voltage terminal 16 are integrally integrated with the clamp-type copper busbar 18. Eliminating separate terminals and terminal blocks facilitates miniaturization; the integrated copper busbar provides conductivity, reducing contact resistance; the integrated bending eliminates splicing, solder joints, and the risk of loosening rivets, ensuring continuous conductivity, stable contact, vibration resistance, and temperature resistance, fully meeting automotive operating conditions. Specifically, the high-voltage terminal 15 is a cylindrical boss integrally stamped on the copper busbar, while the low-voltage terminal 16 is formed by bending and extending the copper busbar body.

[0040] Each end of the clamping copper busbar 18 is equipped with a claw 19. The claw 19 is formed by stamping and bending the ends of the copper busbar, possessing a slight elasticity, and directly clamps and wraps the relay output plug and resistor terminal, ensuring a full fit of the contact surface. The housing has openings at the claw 19 for subsequent local laser spot welding fixation, eliminating the need for bolts and wiring harnesses, perfectly matching the wireless design. The pre-charge resistor 13 generates heat during operation, and the relay contacts experience conduction losses. The exposed metal claw 19 copper busbar directly exchanges heat with the air through convection, significantly improving heat dissipation efficiency compared to the enclosed structure inside the housing, avoiding local heat accumulation, aging, and insulation failure. The exposed clamp structure allows for direct observation during assembly to ensure that the claw 19 is fully clamped, and that the terminals are properly fitted, without misalignment or loosening. During mass production quality inspection and after-sales disassembly and troubleshooting, the reliability of the connection can be checked visually without disassembling the housing. The shape of the gripper 19 can be a U-shaped gripper, an elastic clip, or a snap-on gripper. In this embodiment, the gripper 19 is a forked open elastic gripper. The copper busbar end is forked into two parallel elastic clips that naturally open outward. After the electrical plug is forcefully inserted, the clips spring back and hold the terminal tightly, achieving quick insertion positioning and reliable conductive connection.

[0041] The housing includes an upper shell 11 and a lower shell 14 that are interconnected to form a mounting cavity. For example... Figure 7 As shown, the inner wall of the housing is provided with a raised rib 24, which laterally limits the pre-charge relay 12 and pre-charge resistor 13 inside the housing, restricting the left-right and front-back displacement of the components, and playing a positioning and error-proof role during assembly; the raised rib 24, as an inner wall reinforcing rib, improves the overall rigidity and deformation resistance of the housing, and reduces the risk of deformation and cracking of the thin-walled housing. Figure 8 As shown, the lower shell 14 is provided with a limiting stop 25 that matches the outer contour of the precharge relay 12, which limits and fixes the precharge relay 12 in the circumferential direction, restricting the precharge relay 12 from moving forward, backward, left, right, up, and down, and preventing vibration and deviation.

[0042] This pre-charge unit optimizes the layout of the pre-charge resistor 13 and the pre-charge relay 12, and achieves a compact high-voltage connection structure by combining an integrated clamp 19 copper busbar. Combined with the lightweight design of the bearing base, it effectively reduces the overall space occupied, and fully realizes the miniaturization of the whole machine while improving assembly convenience and production efficiency.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0044] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A water-cooled fast charging device with an integrated pre-charge unit, characterized in that, The device includes a main body and an insulating film (6), a heat-conducting pad (7), and a water-cooling plate (8) that are sequentially attached to the bottom of the main body from the inside out. The main body includes a housing and a pre-charge unit, a contactor (4), a fuse (10), a shunt (9), and a PCBA (3) disposed in the housing. The contactor (4) includes a main positive contactor and a main negative contactor. The pre-charge unit is connected in parallel with the main positive contactor and is disposed together between the fuse (10) and the shunt (9). The main contacts of the contactor (4) are connected to a bent copper busbar. The two ends of the fuse (10) and the shunt (9) are fixed in the housing by heat-conducting blocks. The bent copper busbar and the heat-conducting blocks are exposed from the bottom of the housing and are attached to the insulating film (6).

2. The water-cooled fast charging device with an integrated pre-charge unit according to claim 1, characterized in that, The pre-charge unit includes: The housing has two high-voltage terminals (15) at one end and two low-voltage terminals (16) at the opposite end. A precharge relay (12) is disposed in the housing. The common terminal (21) of the precharge relay (12) is connected to one of the high-voltage terminals (15), and the two control terminals (23) of the precharge relay (12) are respectively connected to the two low-voltage terminals (16). A pre-charge resistor (13) is arranged side by side with the pre-charge relay (12) in the housing. One terminal of the pre-charge resistor (13) is connected to the normally open terminal (22) of the pre-charge relay (12), and the other terminal of the pre-charge resistor (13) is connected to another high-voltage terminal (15). The precharge relay (12) is connected to the precharge resistor (13), the high voltage terminal (15), and the low voltage terminal (16) via a clamping copper busbar (18). The precharge resistor (13) and the high voltage terminal (15) are also connected via a clamping copper busbar (18).

3. A water-cooled fast charging device with an integrated pre-charge unit according to claim 2, characterized in that, The precharge relay (12) and precharge resistor (13) are each enclosed in an independent insulating protective shell.

4. A water-cooled fast charging device with an integrated pre-charge unit according to claim 2, characterized in that, The high-voltage terminal (15) and the low-voltage terminal (16) are both integrally integrated with the clamping copper busbar (18).

5. A water-cooled fast charging device with an integrated pre-charge unit according to claim 2, characterized in that, The ends of the clamping copper busbar (18) are provided with claws (19), and the housing is provided with openings at the claws (19).

6. A water-cooled fast charging device with an integrated pre-charge unit according to claim 2, characterized in that, The housing is provided with a limiting stop (25) that matches the outer contour of the precharge relay (12).

7. A water-cooled fast charging device with an integrated pre-charge unit according to claim 1, characterized in that, The outer shell includes an upper cover (1) and a base (5) that are interlocked and enclosed to form an installation cavity. The precharge unit, contactor (4), fuse (10), and shunt (9) are all installed in the base (5) and located below the PCBA (3). The insulating film (6) is attached to the bottom outer wall of the base (5).

8. A water-cooled fast charging device with an integrated pre-charge unit according to claim 1, characterized in that, The PCBA (3) integrates a component control unit, a communication unit, a voltage acquisition unit, and a current acquisition unit.

9. A water-cooled fast charging device with an integrated pre-charge unit according to claim 1, characterized in that, The water-cooled plate (8) includes one liquid inlet and two liquid outlets, which are respectively located on two different sides of the water-cooled plate (8).

10. A water-cooled fast charging device with an integrated pre-charge unit according to claim 1, characterized in that, The side of the outer casing has a gap for external cables, and a protective cover (2) is provided in the gap.

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