Water-cooled heat dissipation on-board device and electric vehicle

Abstract

The present application provides a water-cooled heat dissipation on-board device, and an electric vehicle. A housing of the on-board device comprises an integrated housing and an electrical cover plate. The integrated housing comprises an electrical accommodating recess for accommodating at least one of an on-board charger and a motor control unit. The electrical cover plate is used for defining the electrical accommodating recess. The integrated housing comprises a housing water channel inlet, and the electrical cover plate comprises a cover plate water channel inlet, a cover plate internal flow channel, and a cover plate water channel outlet, wherein the cover plate internal flow channel is used for receiving cooling water through the cover plate water channel inlet and for conveying the cooling water to the housing water channel inlet through the cover plate water channel outlet. The housing water channel inlet is arranged outside the electrical accommodating recess, and the cover plate water channel inlet and the cover plate water channel outlet are arranged on the side of the electrical cover plate facing the electrical accommodating recess. The orientation of the opening of the electrical accommodating recess is opposite to that of the cover plate water channel inlet and the same as that of the housing water channel inlet. In the on-board device of the present application, a cooling water flow channel is integrated into an electrical cover plate, thereby improving integration level and achieving miniaturization.

Description

Water-cooled vehicle-mounted devices and electric vehicles

[0001] This application claims priority to Chinese Patent Application No. 202423305865.7, filed on December 27, 2024, entitled "Water-cooled heat dissipation vehicle-mounted device and electric vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electric vehicle technology, and more particularly to a water-cooled vehicle-mounted device and an electric vehicle. Background Technology

[0003] The on-board unit integrates an on-board charger or a motor controller. The on-board charger receives high-voltage charging current to charge the battery and receives current from the battery to power other electrical components in the vehicle. The motor controller receives power from the battery and drives the drive motor. Both the on-board charger and the motor controller generate significant heat during operation; therefore, the on-board unit needs improved heat dissipation capabilities without compromising its overall size to ensure reliable operation. Summary of the Invention

[0004] This application provides a water-cooled heat dissipation vehicle-mounted device and an electric vehicle. The vehicle-mounted device integrates cooling water channels on the electrical cover to reduce its volume, which is beneficial to improving the integration and miniaturization of the vehicle-mounted device.

[0005] In a first aspect, this application provides a water-cooled vehicle-mounted device. The housing of the vehicle-mounted device includes an integrated housing and an electrical cover. The integrated housing includes an electrical receiving slot, and the electrical cover encloses the electrical receiving slot, which accommodates at least one electrical component from an on-board charger or a motor controller. The integrated housing includes a housing water channel inlet, and the electrical cover includes a cover water channel inlet, an internal flow channel, and a cover water channel outlet. The internal flow channel receives cooling water through the cover water channel inlet, and the internal flow channel supplies cooling water to the housing water channel inlet through the cover water channel outlet. The housing water channel inlet is located on the outside of the electrical receiving slot, while the cover water channel inlet and cover water channel outlet are located on the side of the electrical cover facing the electrical receiving slot. The orientation of the cover water channel inlet is opposite to the orientation of the opening of the electrical receiving slot, while the orientation of the housing water channel inlet is the same as the orientation of the opening of the electrical receiving slot.

[0006] The water-cooled heat dissipation vehicle-mounted device provided in this application uses an electrical cover plate to enclose the electrical receiving slot of the integrated housing, thereby sealing and protecting at least one electrical component, either an on-board charger or a motor controller, housed within the electrical receiving slot. The vehicle-mounted device also forms part of a cooling water flow channel through the electrical cover plate, wherein the electrical cover plate receives cooling water supplied by the electric vehicle's water-cooling system through a cover plate water channel inlet and supplies cooling water towards the integrated housing through opposite cover plate water channel outlets and housing water channel inlets. As the cooling water flows within the flow channel inside the electrical cover plate, it dissipates heat from the on-board charger or motor controller within the electrical receiving slot. After flowing into the integrated housing, the cooling water continues to cool the on-board charger or motor controller, ensuring reliable operation of the vehicle-mounted device.

[0007] The direction of the cover plate water channel inlet is opposite to the orientation of the electrical housing slot opening. The water pipes of the water cooling system connect to the cover plate water channel inlet in the direction from the integrated housing to the electrical cover plate. The water pipes are arranged adjacent to the integrated housing, and the water pipes do not occupy the space on the side of the electrical cover plate away from the integrated housing, thus controlling the overall height of the vehicle-mounted device housing. The water-cooled heat dissipation vehicle-mounted device provided in this application has a high degree of integration, which is conducive to miniaturization.

[0008] In one implementation, the electrical receiving slot is also used to receive the first circuit board, and the side of the electrical cover facing the electrical receiving slot is used to fix the first circuit board. The side of the first circuit board facing the electrical cover is used to fix the capacitor component and the inductor component in the electrical components of the on-board charger. The side of the electrical cover facing the first circuit board includes a plurality of shielding protrusions, which are respectively used to be embedded in the gaps of other electrical components of the on-board charger.

[0009] In this implementation, a first circuit board and an electrical cover are arranged at intervals, and a capacitor component and an inductor component from the electrical components of the on-board charger are fixed between the first circuit board and the electrical cover. Cooling water can dissipate heat from the capacitor and inductor components as it flows through the internal channels of the electrical cover. Multiple shielding protrusions on the electrical cover facing the first circuit board are used to provide electromagnetic shielding inside the capacitor and inductor components, as well as between the capacitor and inductor components. The electrical cover thus provides both heat dissipation and shielding for the on-board charger.

[0010] In one implementation, the electrical receiving slot is also used to receive a liquid cooling heat sink, the internal flow channel of the cover plate is used to connect the internal flow channel of the liquid cooling heat sink, a first circuit board is arranged between the liquid cooling heat sink and the electrical cover plate, and the side of the first circuit board facing the liquid cooling heat sink is used to fix multiple power modules in the electrical components of the on-board charger and the liquid cooling heat sink.

[0011] In this implementation, a first circuit board and a liquid-cooled heat sink are arranged at intervals, and multiple power modules from the electrical components of the on-board charger are fixed between the first circuit board and the liquid-cooled heat sink. Cooling water flows through the liquid-cooled heat sink to dissipate heat from the multiple power modules. The liquid-cooled heat sink and the electrical cover plate work together to dissipate heat from the on-board charger, ensuring its reliable operation.

[0012] In one implementation, the electrical receiving tank also houses a water-cooled radiator and a second circuit board. The water-cooled radiator receives cooling water from the inlet of the housing's water channel. The second circuit board controls a three-phase inverter circuit in the electrical components of the motor controller. The three-phase inverter circuit includes a bus capacitor module and multiple power modules. The first circuit board, liquid-cooled heat sink, second circuit board, water-cooled radiator, and bus capacitor module are sequentially stacked between the electrical cover plate and the bottom of the electrical receiving tank. The bus capacitor module is used to fix the second circuit board and the water-cooled radiator, and the multiple power modules are arranged between the second circuit board and the water-cooled radiator.

[0013] In this implementation, the motor controller is arranged between the bottom of the electrical housing and the liquid-cooled heat sink. The water-cooled heat sink is used to dissipate heat from the multiple power modules of the motor controller to ensure reliable operation of the motor controller. Specifically, the water-cooled heat sink receives cooling water input from the electrical cover plate through the housing water channel inlet of the integrated housing.

[0014] In one implementation, the electrical cover plate includes a cooling tank and a cooling cover plate. The cooling tank is distributed on the side of the electrical cover plate away from the electrical receiving tank. The cooling cover plate is used to enclose the cooling tank to form an internal flow channel. The bottom of the cooling tank includes a first through hole and a second through hole, which respectively penetrate the bottom of the cooling tank. The first through hole is used to connect to the inlet of the liquid cooling heat sink, and the second through hole is used to connect to the outlet of the liquid cooling heat sink.

[0015] In this implementation, the opening direction of the cooling groove of the electrical cover plate is the same as the opening direction of the electrical receiving groove, and the cooling cover plate covers the cooling groove to form an internal flow channel. In the event of an accidental leak, the cooling water seeps out in the direction away from the electrical receiving groove, which can protect the electrical components inside the electrical receiving groove. The cooling groove is also connected to the liquid cooling heat sink through the first through hole and the second through hole, thereby circulating cooling water to the liquid cooling heat sink.

[0016] In one implementation, the side of the liquid cooling heat sink facing the electrical cover is used to fix the heat sink nozzle. The heat sink nozzle includes a first connecting water channel and a second connecting water channel. The first connecting water channel is used to connect the inlet of the liquid cooling heat sink and a first through hole, and the second connecting water channel is used to connect the outlet of the liquid cooling heat sink and a second through hole.

[0017] In this implementation, the liquid cooling heat sink and the electrical cover are arranged parallel to each other and spaced apart. The heat sink nozzle is fixed to the side of the liquid cooling heat sink facing the electrical cover. Along the direction of the stacked arrangement of the electrical cover and the liquid cooling heat sink, one end of the heat sink nozzle is used to connect the inlet and outlet of the liquid cooling heat sink, and the other end of the heat sink nozzle is used to connect the first through hole and the second through hole, thereby introducing cooling water from the electrical cover into the liquid cooling heat sink.

[0018] In one implementation, the two ends of the heat sink nozzle are distributed along the direction of the stacked arrangement of the electrical cover plate and the liquid-cooled heat sink, and each end of the heat sink nozzle includes two grooves. The inlet of the first connecting water channel and the outlet of the second connecting water channel are located at the bottom of one of the two grooves. One groove covers the first and second through holes, with the inlet of the first connecting water channel connecting to the first through hole and the outlet of the second connecting water channel connecting to the second through hole. The outlet of the first connecting water channel and the inlet of the second connecting water channel are located at the bottom of the other groove, with the other groove covering the inlet and outlet of the liquid-cooled heat sink. The outlet of the first connecting water channel connects to the inlet of the liquid-cooled heat sink, and the inlet of the second connecting water channel connects to the outlet of the liquid-cooled heat sink.

[0019] In this implementation, the two ends of the heat sink nozzle are respectively connected to the liquid-cooled heat sink and the electrical cover plate via two grooves, thereby realizing the circulation of cooling water between the liquid-cooled heat sink and the electrical cover plate. One groove is used to accommodate the inlet and outlet of the liquid-cooled heat sink, and the groove wall can form a sealing fit with the inlet and outlet of the liquid-cooled heat sink. The other groove is used to mate with the first through hole and the second through hole, and the groove wall of the other groove can form a sealing fit with the first through hole and the second through hole. The two grooves are used to prevent cooling water leakage in the electrical cover plate.

[0020] In one implementation, the bottom of the cooling tank further includes a third through hole, a fourth through hole, and a first dividing protrusion. The third through hole is used to connect to the inlet of the cover plate water channel, the fourth through hole is used to connect to the outlet of the cover plate water channel, and the first dividing protrusion is used to separate the third through hole and the fourth through hole to form a U-shaped flow channel.

[0021] In this implementation, the first dividing protrusion is used to form a U-shaped flow channel in the internal flow channel of the cover plate, thereby increasing the flow path of cooling water in the internal flow channel of the cover plate, so that the cooling water can form a more sufficient heat exchange with the on-board charger to improve the heat dissipation effect of the electrical cover plate.

[0022] In one implementation, the bottom of the cooling tank further includes a second dividing protrusion, which is used to separate the first through hole and the second through hole. A third through hole and the first through hole are arranged between the first dividing protrusion and the second dividing protrusion. The first through hole and the third through hole are arranged on one side of the second dividing protrusion, and the second through hole is arranged on the other side of the second dividing protrusion.

[0023] In this implementation, the third through-hole and the first through-hole are arranged between the first partition protrusion and the second partition protrusion. The second partition protrusion separates the first through-hole and the second through-hole. Cooling water entering the internal flow channel of the cover plate from the cover plate water channel inlet through the third through-hole first flows into the liquid cooling heat sink through the first through-hole, then flows back into the internal flow channel of the cover plate through the second through-hole, and then flows into the housing water channel inlet through the fourth through-hole from the cover plate water channel outlet. This arrangement ensures that the temperature of the cooling water flowing into the liquid cooling heat sink is relatively low, improving the heat dissipation effect of the liquid cooling heat sink for multiple power modules.

[0024] In one implementation, the bottom of the cooling tank further includes multiple heat dissipation teeth and multiple flow guiding teeth. The multiple heat dissipation teeth are distributed on both sides of the first dividing protrusion, and the multiple flow guiding teeth are also distributed on both sides of the first dividing protrusion. At least one of the flow guiding teeth or heat dissipation teeth on both sides of the first dividing protrusion differs in number, shape, or arrangement.

[0025] In this implementation, multiple cooling fins are used to slow down the flow rate of cooling water in the internal flow channels of the cover plate, thereby improving the heat exchange effect of the cooling water as it flows through the multiple cooling fins. Multiple guide fins are used to guide the cooling water along the flow path in the internal flow channels of the cover plate. The multiple cooling fins and multiple guide fins are arranged alternately in the internal flow channels of the cover plate, which can form heat dissipation zones of different numbers, sizes and regions in the internal flow channels of the cover plate. Each heat dissipation zone is matched with the number, shape and position of the electrical components of the on-board charger.

[0026] In one implementation, the bottom of the electrical containment tank further includes a first bottom water channel interface and a second bottom water channel interface. The inlet of the water-cooled radiator is used to receive cooling water input from the housing water channel inlet through the first bottom water channel interface, and the second bottom water channel interface is used to receive cooling water output from the outlet of the water-cooled radiator. The orientation of the first bottom water channel interface and the orientation of the second bottom water channel interface are the same as the orientation of the opening of the electrical containment tank, while the orientation of the inlet and the orientation of the outlet of the water-cooled radiator are opposite to the orientation of the opening of the electrical containment tank. The inlet of the water-cooled radiator is used to embed the first bottom water channel interface, and the outlet of the water-cooled radiator is used to embed the second bottom water channel interface.

[0027] In this implementation, the integrated housing is used to communicate with the water-cooled radiator through the first and second bottom water channel interfaces. The first and second bottom water channel interfaces extend from the bottom of the electrical containment tank toward the water-cooled radiator, respectively. The inlet and outlet of the water-cooled radiator are embedded in the first and second bottom water channel interfaces, respectively, so as to form a sealing fit between the inner wall of the first bottom water channel interface and the outer wall of the water-cooled radiator inlet, and the inner wall of the second bottom water channel interface and the outer wall of the water-cooled radiator outlet, respectively, to prevent the cooling water from leaking into the electrical containment tank.

[0028] In one implementation, the integrated housing further includes an internal water inlet channel, an internal water outlet channel, and a housing water channel outlet. The internal water inlet channel connects the housing water channel inlet to the first bottom water channel interface, and the internal water outlet channel connects the second bottom water channel interface to the housing water channel outlet. The housing water channel inlet and outlet are located on the same side outside the electrical containment tank, and the orientation of the housing water channel outlet differs from the orientation of the housing water channel inlet.

[0029] In this implementation, the integrated housing transports cooling water flowing in from the housing water inlet to the first tank bottom water interface via an internal water inlet channel. The integrated housing also transports cooling water from the water-cooled radiator to the electric vehicle's water-cooling system via an internal water outlet channel. Because the housing water inlet and the cover water inlet are located on the same side of the electrical receiving tank, and the housing water outlet and the cover water inlet are also located on the same side of the electrical receiving tank, the water pipes of the electric vehicle's water-cooling system input and receive cooling water from the housing on the same side of the on-board unit's housing. Since the two water pipes occupy the same side of the on-board unit's housing, the overall width of the on-board unit's housing is controlled.

[0030] In one implementation, an electrical cover plate is used to fix a water channel connection assembly, the water channel connection assembly having two ends, one end of the water channel connection assembly being used to enclose the water channel inlet of the cover plate, and the other end of the water channel connection assembly being used to receive cooling water supplied by the water cooling system of an electric vehicle through a water pipe, and the housing water channel outlet of the integrated housing being used to supply cooling water to the water cooling system of the electric vehicle through a water pipe.

[0031] In this implementation, the electrical cover is roughly plate-shaped and is connected to the water pipes of the water-cooling system via a water channel connection component, facilitating a sealed fit between the cover and the water pipes. The water channel outlet of the housing can be constructed in the form of a water nozzle, thereby directly connecting to and sealing with the water pipes of the water-cooling system.

[0032] In one implementation, the vehicle-mounted device further includes a drive motor and a reducer. The housing of the vehicle-mounted device also includes a motor end cover and a reducer end cover. The integrated housing further includes a motor receiving slot and a reducer receiving slot. The motor receiving slot is used to fix and receive the stator of the drive motor. The motor end cover is used to enclose the motor receiving slot. The reducer receiving slot is used to receive the gear set of the reducer. The reducer end cover is used to enclose the reducer receiving slot. The motor receiving slot and the reducer receiving slot are arranged adjacent to each other along the axial direction of the drive motor. The slot opening orientation of the motor receiving slot is opposite to that of the reducer receiving slot. The slot opening orientation of the motor receiving slot is perpendicular to the slot opening orientation of both the motor receiving slot and the reducer receiving slot.

[0033] In this implementation, the integrated housing of the vehicle-mounted device further includes a motor receiving slot and a reducer receiving slot. The integrated housing is used to fix the stator of the drive motor, and the motor end cover and reducer end cover are used to fix the drive shaft of the reducer through bearings. The motor receiving slot accommodates the drive motor, and the reducer receiving slot accommodates the gear set of the reducer. The integration level of the vehicle-mounted device in this application is further improved.

[0034] The opening of the motor receiving slot faces opposite directions to those of the reducer receiving slot. The drive motor and reducer are arranged adjacent to each other along the drive motor's axial direction, reducing the length of the vehicle-mounted device along the drive motor's axial direction. The opening of the electrical receiving slot is perpendicular to both the motor and reducer receiving slots. The electrical cover of the vehicle-mounted device is parallel to the drive motor's axial direction and closer to the drive motor's axis, reducing the height of the vehicle-mounted device along the direction perpendicular to the electrical cover. The overall volume of the vehicle-mounted device is further reduced.

[0035] In one implementation, the wall of the electrical receiving slot includes a first section, a second section, a third section, and a fourth section. The first and second sections are arranged opposite each other along the axial direction of the drive motor, and the third and fourth sections are arranged opposite each other along an axial direction perpendicular to the drive motor. The distance between the first section and the opening of the motor receiving slot is greater than the distance between the second section and the opening of the motor receiving slot. The distance between the third section and the motor shaft of the drive motor is less than the distance between the fourth section and the motor shaft of the drive motor. The power battery interface of the vehicle-mounted device is distributed in the first section, the load power supply interface of the vehicle-mounted device is distributed in the second section, the control signal interface of the vehicle-mounted device is distributed in the third section, and the housing water channel outlet and housing water channel inlet are distributed on the outside of the fourth section.

[0036] In this implementation, the second and first slot walls are arranged sequentially along the direction from the motor end cover to the reducer end cover. The on-board device receives power from the power battery or supplies power to the power battery through the power battery interface on the first slot wall, and supplies power to the load of the electric vehicle through the load power supply interface on the second slot wall.

[0037] Along the axial direction perpendicular to the drive motor, the fourth section of the slot wall is offset towards the drive motor side relative to the third section of the slot wall. The fourth section of the slot wall and the output wheel of the gear set in the reducer, which is used to output power, are arranged adjacent to each other along the axial direction of the drive motor. The electrical housing slot can make full use of the space on the side of the drive motor facing the output wheel of the reducer, thereby reducing the overall width of the on-board unit. The on-board unit receives or sends control signals from the electric vehicle through the control signal interface on the third section of the slot wall. The on-board unit receives cooling water supplied by the water cooling system through the cover plate water channel inlet on the fourth section of the slot wall and supplies cooling water to the cooling system through the shell water channel outlet on the fourth section of the slot wall.

[0038] Secondly, this application provides an electric vehicle, which includes a power battery and an on-board device provided by any of the above implementations, the on-board device being used to charge the power battery or to drive the wheels using the power supplied by the power battery.

[0039] The electric vehicle provided in the second aspect of this application saves interior space by including the aforementioned on-board device, which is beneficial for improving the integration of the electric vehicle and for miniaturization. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0041] Figure 1 is a structural schematic diagram of an electric vehicle 200 provided in an embodiment of this application;

[0042] Figure 2 is a schematic diagram of the internal power supply logic of an electric vehicle 200 provided in an embodiment of this application;

[0043] Figure 3 is a schematic diagram of the internal components of a vehicle-mounted device 100 provided in an embodiment of this application;

[0044] Figure 4 is a schematic diagram of the external structure of a vehicle-mounted device 100 provided in an embodiment of this application;

[0045] Figure 5 is an exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0046] Figure 6 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0047] Figure 7 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0048] Figure 8 is an exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0049] Figure 9 is an exploded structural diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0050] Figure 10 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0051] Figure 11 is an exploded structural diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0052] Figure 12 is a schematic planar structure diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0053] Figure 13 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0054] Figure 14 is an exploded structural diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0055] Figure 15 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0056] Figure 16 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0057] Figure 17 is an exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0058] Figure 18 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0059] Figure 19 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0060] Figure 20 is a partial cross-sectional schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0061] Figure 21 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0062] Figure 22 is an exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0063] Figure 23 is a partial cross-sectional schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0064] Figure 24 is a partial cross-sectional schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0065] Figure 25 is a partial cross-sectional schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0066] Figure 26 is a structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0067] Figure 27 is an exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0068] Figure 28 is a structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0069] Figure 29 is an exploded structural diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0070] Figure 30 is a structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0071] Figure 31 is a structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0072] Figure 32 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0073] Figure 33 is a partial structural schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0074] Figure 34 is a partially exploded structural diagram of a vehicle-mounted device 100 provided in an embodiment of this application;

[0075] Figure 35 is a partially exploded structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application;

[0076] Figure 36 is a partial cross-sectional structural diagram of a vehicle-mounted device 100 provided in one embodiment of this application. Detailed Implementation

[0077] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0079] OBC: On-board Charger, is a power electronic device that converts alternating current (AC) into direct current (DC) to charge a vehicle's battery.

[0080] ACDC stands for Alternating Current to Direct Current. It's an AC converter circuit that can convert AC power to DC current or vice versa. For example, it can convert external high-voltage charging current into high-voltage DC current to charge a vehicle's battery, or convert the high-voltage DC current from the battery into high-voltage AC current to power the drive motor.

[0081] DCDC: Direct Current to Direct Current, a DC-DC converter circuit that can convert DC current at one voltage level to DC current at another voltage level, thereby regulating power output and stabilizing power supply voltage. For example, it can convert the high-voltage DC power output from a vehicle's battery into low-voltage DC power to supply power to other electrical components in the vehicle.

[0082] MCU: Motor Control Unit, which receives control commands from the vehicle controller and then controls the speed and direction of rotation of the drive motor.

[0083] In this article, "high voltage" and "low voltage" refer to the relative magnitude of voltage. "High voltage" means that the voltage of "low voltage" is relatively higher than that of "low voltage," and does not represent specific voltage values.

[0084] This application provides a water-cooled vehicle-mounted device. The housing of the vehicle-mounted device includes an integrated housing and an electrical cover. The integrated housing includes an electrical receiving slot, and the electrical cover encloses the electrical receiving slot, which accommodates at least one electrical component from an on-board charger or a motor controller. The integrated housing includes a housing water channel inlet, and the electrical cover includes a cover water channel inlet, an internal flow channel, and a cover water channel outlet. The internal flow channel receives cooling water through the cover water channel inlet, and the internal flow channel supplies cooling water to the housing water channel inlet through the cover water channel outlet. The housing water channel inlet is located on the outside of the electrical receiving slot, while the cover water channel inlet and cover water channel outlet are located on the side of the electrical cover facing the electrical receiving slot. The orientation of the cover water channel inlet is opposite to the orientation of the opening of the electrical receiving slot, while the orientation of the housing water channel inlet is the same as the orientation of the opening of the electrical receiving slot. The water-cooled heat dissipation vehicle device provided in this application forms part of the cooling water flow channel through the electrical cover plate. When the cooling water flows in the flow channel inside the cover plate of the electrical cover plate, it can dissipate heat for the vehicle charger or motor controller in the electrical housing slot, ensuring the reliable operation of the vehicle device.

[0085] This application provides an electric vehicle, which includes a power battery and an on-board unit provided in this application. The on-board unit is used to charge the power battery or to drive the wheels using the power supplied by the power battery. The electric vehicle provided in this application has a more compact interior space, which is beneficial for improving the miniaturization of electric vehicles.

[0086] The electric vehicles provided in this application include electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), and new energy vehicles. In some embodiments, electric vehicles include passenger cars and various special-purpose vehicles with specific functions, such as emergency rescue vehicles, water trucks, sewage suction trucks, cement mixer trucks, crane trucks, and medical vehicles. Electric vehicles can also be driving robots.

[0087] Please refer to Figure 1, which shows a structural schematic diagram of an electric vehicle 200 provided in one embodiment of this application, and Figure 2, which shows a schematic diagram of the internal power supply logic of an electric vehicle 200 provided in one embodiment of this application.

[0088] As shown in Figure 1, the electric vehicle 200 provided in this application includes a power battery 201 and an on-board unit 100 provided in this application. The power battery 201 and the on-board unit 100 are respectively fixed to the frame of the electric vehicle 200. The on-board unit 100 is used for electrical connection with the power battery 201.

[0089] The power battery 201 supplies power to the various electrical components of the electric vehicle 200. These electrical components include a first type of load 210 and a second type of load 220. The first type of load 210 is a high-voltage load, such as the compressor and heater of the electric vehicle 200. The second type of load 220 is a low-voltage load, such as at least one of a low-voltage battery, lights, wipers, air conditioning, audio system, USB port, instrument panel, and control display screen. The low-voltage battery can also supply power to other loads within the second type of load 220.

[0090] The power battery 201 outputs high-voltage direct current. The power battery 201 can directly supply power to the first type of load 210, and also supply power to the second type of load 220 via the vehicle-mounted device 100 provided in this application. In some embodiments, the power battery 201 can also supply power to the first type of load 210 via the vehicle-mounted device 100 provided in this application.

[0091] In one embodiment, the electric vehicle 200 provided in this application includes a drive motor 202. The drive motor 202 is used to drive the wheels of the electric vehicle 200 to rotate. The drive motor 202 belongs to a first type of load 210. The operating current of the drive motor 202 is high-voltage alternating current. The power battery 201 supplies power to the drive motor 202 through the on-board device 100 provided in this application. That is, the on-board device 100 provided in this application is used to receive the high-voltage direct current input from the power battery 201 and convert it into high-voltage alternating current to supply power to the drive motor 202.

[0092] The on-board unit 100 is used for charging and discharging the power battery 201 and for supplying power to the drive motor 202. The on-board unit 100 receives high-voltage charging current from an external power source. In one embodiment, the external power source can be an AC mains grid, an AC charging station, or an uninterruptible power system (UPS). In this case, the external power source is AC power. The on-board unit 100 is used to electrically connect to the external power source and receive high-voltage AC power. The on-board unit 100 converts the received high-voltage AC power into high-voltage DC power and supplies it to the power battery 201 to achieve the charging and discharging function.

[0093] In one embodiment, the vehicle-mounted device 100 provided in this application converts the voltage amplitude or frequency of the received high-voltage AC power and outputs another form of AC power to supply power to other electrical components that need to operate under AC power.

[0094] In one embodiment, the vehicle-mounted device 100 provided in this application includes a drive motor 202.

[0095] Please refer to Figure 3, which shows a schematic diagram of the internal components of an in-vehicle device 100 provided in one embodiment of this application.

[0096] The on-board device 100 provided in this application includes at least one of an on-board charger 10 and a motor controller 20. The on-board charger 10 is used to receive high-voltage charging current and convert it into high-voltage direct current to supply power to the power battery 201. The on-board charger 10 is also used to receive high-voltage direct current input from the power battery 201 and convert it into low-voltage direct current to supply power to the second type of load 220 of the electric vehicle 200.

[0097] The on-board charger 10 includes an AC conversion circuit and a DC conversion circuit. The AC conversion circuit receives high-voltage charging current and converts it into DC power to supply power to the power battery 201. The DC conversion circuit receives high-voltage DC power from the power battery 201 and converts it into low-voltage DC power to supply power to the second type of load 220 of the electric vehicle 200. The motor controller 20 receives high-voltage DC power from the power battery 201 and converts it into high-voltage AC current to supply power to the drive motor 202. The motor controller 20 also includes an AC conversion circuit.

[0098] Please refer to Figure 4, which shows the external structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 5, which shows the exploded structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application; and Figure 6, which shows the partial structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0099] The vehicle-mounted device 100 provided in this application includes a housing and a power supply integrated module. The housing includes an integrated housing 30 and an electrical cover 40. The integrated housing 30 includes an electrical receiving slot 31, within which the power supply integrated module is received. The electrical cover 40 is used to enclose the electrical receiving slot 31. The power supply integrated module includes at least one of the aforementioned on-board charger 10 and motor controller 20. That is, the electrical receiving slot 31 is used to receive electrical components of at least one of the on-board charger 10 or the motor controller 20.

[0100] The integrated housing 30 includes a housing water channel inlet 301, and the electrical cover 40 includes a cover water channel inlet 401, an internal flow channel, and a cover water channel outlet 402. The internal flow channel receives cooling water through the cover water channel inlet 401 and supplies cooling water to the housing water channel inlet 301 through the cover water channel outlet 402. The housing water channel inlet 301 is located on the outside of the electrical receiving tank 31, while the cover water channel inlet 401 and the cover water channel outlet 402 are located on the side of the electrical cover 40 facing the electrical receiving tank 31. The orientation of the cover water channel inlet 401 is opposite to the orientation of the opening of the electrical receiving tank 31, while the orientation of the housing water channel inlet 301 is the same as the orientation of the opening of the electrical receiving tank 31.

[0101] The water-cooled vehicle-mounted device 100 provided in this application encloses the electrical receiving slot 31 of the integrated housing 30 with an electrical cover plate 40 to seal and protect at least one electrical component of the on-board charger 10 or motor controller 20 housed within the electrical receiving slot 31. The vehicle-mounted device 100 also forms part of a cooling water flow channel through the electrical cover plate 40, wherein the electrical cover plate 40 receives cooling water supplied by the water-cooling system of the electric vehicle 200 through a cover plate water channel inlet 401, and supplies cooling water towards the integrated housing 30 through the opposite cover plate water channel outlet 402 and housing water channel inlet 301. As the cooling water flows within the flow channel inside the cover plate of the electrical cover plate 40, it can dissipate heat from the on-board charger 10 or motor controller 20 within the electrical receiving slot 31. After flowing into the integrated housing 30, the cooling water can continue to cool the on-board charger 10 or motor controller 20, ensuring the reliable operation of the vehicle-mounted device 100.

[0102] The direction of the cover plate water channel inlet 401 is opposite to the orientation of the slot opening of the electrical receiving slot 31. The water pipes of the water cooling system connect to the cover plate water channel inlet 401 from the integrated housing 30 towards the electrical cover plate 40. The water pipes are arranged adjacent to the integrated housing 30, and the water pipes do not occupy the space on the side of the electrical cover plate 40 away from the integrated housing 30, thus controlling the overall height of the vehicle-mounted device 100 housing. The water-cooled heat dissipation vehicle-mounted device 100 provided in this application has a high degree of integration, which is conducive to miniaturization. The electric vehicle 200 provided in this application saves internal space because it includes the vehicle-mounted device 100, which is conducive to improving the integration of the electric vehicle 200 and miniaturization.

[0103] In this embodiment of the application, the all-in-one vehicle device 100 also serves as an all-in-one vehicle power supply device.

[0104] In this embodiment of the application, the cooling water in the vehicle-mounted device 100 can be coolant or cooling oil.

[0105] Please refer to Figure 7, which shows a partial structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 8, which shows an exploded structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 9, which shows an exploded structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application; and Figure 10, which shows a partial structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0106] In one embodiment, the electrical receiving groove 31 is also used to receive the first circuit board 11, and the side of the electrical cover plate 40 facing the electrical receiving groove 31 is used to fix the first circuit board 11. The side of the first circuit board 11 facing the electrical cover plate 40 is used to fix the capacitor component and the inductor component 12 in the electrical components of the on-board charger 10. The side of the electrical cover plate 40 facing the first circuit board 11 includes a plurality of shielding protrusions 41, and the plurality of shielding protrusions 41 are respectively used to be embedded in the gaps of other electrical components of the on-board charger 10.

[0107] In this embodiment, the first circuit board 11 and the electrical cover plate 40 are arranged at intervals, and the capacitor component and the inductor component 12 of the electrical components of the on-board charger 10 are fixed between the first circuit board 11 and the electrical cover plate 40. Cooling water can dissipate heat from the capacitor component and the inductor component 12 when it flows through the internal flow channel of the electrical cover plate 40. The multiple shielding protrusions 41 of the electrical cover plate 40 facing the first circuit board 11 are used to achieve electromagnetic shielding inside the capacitor component, inside the inductor component, and between the capacitor component and the inductor component 12. The electrical cover plate 40 thus provides both heat dissipation and shielding for the on-board charger 10.

[0108] Please refer to Figure 11, which shows an exploded view of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 12, which shows a planar view of the vehicle-mounted device 100 provided in one embodiment of this application.

[0109] In one embodiment, the electrical receiving slot 31 is also used to receive the liquid cooling heat sink 50, the internal flow channel of the cover plate is used to connect the internal flow channel of the liquid cooling heat sink 50, the first circuit board 11 is arranged between the liquid cooling heat sink 50 and the electrical cover plate 40, and the side of the first circuit board 11 facing the liquid cooling heat sink 50 is used to fix the multiple power modules 14 in the electrical components of the on-board charger 10 and the liquid cooling heat sink 50.

[0110] In this embodiment, the first circuit board 11 and the liquid cooling heat sink 50 are arranged at intervals, and multiple power modules 14 of the electrical components of the on-board charger 10 are fixed between the first circuit board 11 and the liquid cooling heat sink 50. Cooling water can dissipate heat from the multiple power modules 14 when it flows through the liquid cooling heat sink 50. The liquid cooling heat sink 50 and the electrical cover plate 40 can work together to dissipate heat from the on-board charger 10 to ensure reliable operation of the on-board charger 10. That is, along the height direction of the on-board device 100, multiple power modules 14 are fixed to the surface of the first circuit board 11 facing the liquid cooling heat sink 50, and the orthographic projection of the liquid cooling heat sink 50 accommodates multiple power modules 14.

[0111] In various embodiments of the vehicle-mounted device 100 of this application, the comparison of the orthographic projection of "A" along a certain direction with "B" can be understood as comparing the orthographic projection of "A" onto "B" with the area of ​​"B", or as comparing the two orthographic projections formed by "A" and "B" respectively onto "C". Here, "C" is a planar structure perpendicular to that direction. For example, along the height direction of the vehicle-mounted device 100, "C" can be any one of the electrical cover 40, the base plate 32, the circuit board of the on-board charger 10, or the circuit board of the motor controller 20.

[0112] In one embodiment, at least a portion of the power modules 14 are used to form the AC conversion circuit of the on-board charger 10. The on-board charger 10 is used to convert the high-voltage charging current from AC to DC current through the multiple power modules 14, thereby charging the power battery 201. The power modules 14 are one of the main heat sources of the on-board charger 10. The multiple power modules 14 are arranged at intervals along the planar direction of the first circuit board 11. Because the liquid cooling heat sink 50 is stacked with the first circuit board 11, the liquid cooling heat sink 50 is relatively close to the multiple power modules 14 along the thickness direction of the first circuit board 11. The orthographic projection of the liquid cooling heat sink 50 accommodates the multiple power modules 14, which can dissipate heat from each power module 14 separately to ensure the reliable operation of the on-board charger 10.

[0113] In one embodiment, the liquid-cooled heat sink 50 abuts against each power module 14. In another embodiment, a thermally conductive material, such as thermally conductive adhesive, is included between the liquid-cooled heat sink 50 and each power module 14. The liquid-cooled heat sink 50 and each power module 14 are thermally connected through the thermally conductive material. The thermally conductive material can also be used to accommodate the assembly tolerances between the liquid-cooled heat sink 50 and each power module 14, reducing the internal stress of the vehicle-mounted device 100 provided in this application.

[0114] In one embodiment, some of the capacitor components or inductor components 12 are fixed to the electrical cover plate 40. Along the height direction of the vehicle-mounted device 100, some of the capacitor components and inductor components are fixed to the electrical cover plate 40 on the side facing the first circuit board 11. That is, the first circuit board 11, the multiple capacitor components and inductor components 12, and the electrical cover plate 40 are arranged in a sequentially stacked manner. The coverage area of ​​the internal flow channel of the cover plate along the height direction of the vehicle-mounted device 100 accommodates the orthographic projection of the multiple capacitor components and inductor components 12.

[0115] At least one of the multiple capacitor components and inductor components 12 is used to form the DC-DC conversion circuit of the on-board charger 10. The on-board charger 10 is used to adjust the voltage of the current through some of the capacitor components and inductor components before outputting it to the electrical components in the vehicle. The capacitor components and inductor components 12 are one of the main heat sources of the on-board charger 10. The multiple capacitor components and inductor components 12 are arranged at intervals along the planar direction of the first circuit board 11. Because the internal flow channels of the cover plate are stacked with the multiple capacitor components and inductor components 12 along the thickness direction of the first circuit board 11, the cooling water flowing in the internal flow channels of the cover plate can dissipate heat from the multiple capacitor components and inductor components 12 respectively, so as to ensure the reliable operation of the on-board charger 10.

[0116] In one embodiment, the on-board charger 10 includes a small circuit board 13. The area of ​​the small circuit board 13 is smaller than that of the first circuit board 11. The small circuit board 13 is used to fix some electrical components of the on-board charger 10. The first circuit board 11, the small circuit board 13, and the electrical cover plate 40 are stacked sequentially along the height direction of the vehicle device 100. Some electrical components of the on-board charger 10 are fixed to the surface of the small circuit board 13 facing the electrical cover plate 40, and the coverage area of ​​the flow channel inside the cover plate accommodates the orthographic projection of some electrical components of the on-board charger 10.

[0117] The electrical components of the on-board charger 10, fixed by the small circuit board 13, form the DC-DC converter circuit of the on-board charger 10. In one embodiment, the small circuit board 13 is electrically connected to the first circuit board 11 via a capacitor assembly and an inductor assembly 12. The small circuit board 13 is used to fix the electrical components of the secondary circuit in the DC-DC converter circuit, and the first circuit board 11 is used to fix the electrical components of the primary circuit in the DC-DC converter circuit. The primary circuit receives the high-voltage DC current output from the power battery 201. After power conversion by the capacitor assembly, inductor assembly 12, and secondary circuit, the on-board charger 10 outputs a low-voltage DC current via the secondary circuit to supply power to the vehicle's second-class load 220.

[0118] In one embodiment, along the planar direction of the vehicle-mounted device 100, a small circuit board 13 is arranged adjacent to a plurality of capacitor components and inductor components 12. Along the height direction of the vehicle-mounted device 100, the small circuit board 13 and the plurality of capacitor components and inductor components 12 are arranged between a first circuit board 11 and an electrical cover plate 40. The area of ​​the plurality of capacitor components and inductor components 12 along the planar direction of the vehicle-mounted device 100 is smaller than the area of ​​the first circuit board 11, while the size of the plurality of capacitor components and inductor components 12 is larger along the height direction of the vehicle-mounted device 100. When the first circuit board 11, the plurality of capacitor components and inductor components 12, and the electrical cover plate 40 are arranged along the height direction of the vehicle-mounted device 100, a portion of the area between the first circuit board 11 and the electrical cover plate 40 is formed on the side of the plurality of capacitor components and inductor components 12. By mounting some electrical components of the on-board charger 10 on the small circuit board 13, the space area on the side of multiple capacitor components and inductor components 12 can be reasonably utilized, reducing the overall area of ​​the on-board charger 10, and ensuring that the internal flow channels of the cover plate can reliably dissipate heat from the multiple capacitor components and inductor components 12 and the electrical components of the secondary circuit.

[0119] In one embodiment, the small circuit board 13, multiple capacitor components and inductor components 12, and connecting post 442 are arranged sequentially along a planar direction of the vehicle-mounted device 100. For ease of description, in subsequent embodiments of this application, the arrangement direction of the small circuit board 13 and the multiple capacitor components and inductor components 12 is defined as a first direction 001. The first direction 001 is a planar direction of the vehicle-mounted device 100.

[0120] The electrical cover 40 is connected to the liquid cooling heat sink 50 via a connecting post 442. Part of the cooling water entering the internal flow channel of the cover from the cover water channel inlet 401 flows into the liquid cooling heat sink 50 through the connecting post 442, while the other part flows through the internal flow channel of the cover, passing successively over the projected areas of multiple capacitor components and inductor components 12. The cooling water flowing in from the cover water channel inlet 401 has a relatively low temperature. By positioning the connecting post 442 closer to the cover water channel inlet 401 than the multiple capacitor components and inductor components 12, the temperature of the cooling water flowing into the liquid cooling heat sink 50 is relatively low. Simultaneously, the temperature of the cooling water flowing towards the multiple capacitor components and inductor components 12 is also relatively low. This helps to balance the heat dissipation effect among the various electrical components in the on-board charger 10, reduce the temperature difference between the various electrical components, and ensure temperature uniformity among the various electrical components of the on-board charger 10.

[0121] In one embodiment, along the height direction of the vehicle-mounted device 100, the orthographic projections of a plurality of capacitor components and inductor components 12 partially overlap with the orthographic projections of a plurality of power modules 14.

[0122] Please refer to Figure 13 for a partial structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 14 for an exploded structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0123] In one embodiment, the electrical cover plate 40 includes a cooling groove 42 and a cooling cover plate 43. The cooling groove 42 is distributed on the side of the electrical cover plate 40 away from the electrical receiving groove 31. The cooling cover plate 43 is used to enclose the cooling groove 42 to form an internal flow channel. The bottom of the cooling groove 42 includes a first through hole 421 and a second through hole 422. The first through hole 421 and the second through hole 422 respectively penetrate the bottom of the cooling groove 42. The first through hole 421 is used to connect to the inlet 51 of the liquid cooling heat sink 50, and the second through hole 422 is used to connect to the outlet 52 of the liquid cooling heat sink 50.

[0124] In this embodiment, the opening direction of the cooling groove 42 of the electrical cover plate 40 is the same as the opening direction of the electrical receiving groove 31, and the cooling cover plate 43 covers the cooling groove 42 to form an internal flow channel. In the event of an accidental leak, the cooling water seeps out in the direction away from the electrical receiving groove 31, which can protect the electrical components inside the electrical receiving groove 31. The cooling groove 42 is also connected to the liquid cooling heat sink 50 through the first through hole 421 and the second through hole 422, thereby circulating cooling water to the liquid cooling heat sink 50.

[0125] In this embodiment, the internal flow channel of the cover plate is formed by the cooling groove 42 and the cooling cover plate 43 of the electrical cover plate 40. That is, the structure formed by the cooling groove 42 and the cooling cover plate 43 together is the structure of the internal flow channel. Therefore, the internal flow channel of the cover plate is no longer shown separately by reference numerals in the accompanying drawings.

[0126] In one embodiment, the opening of the cooling groove 42 faces away from the integrated housing 30, that is, the direction of the opening of the cooling groove 42 faces away from the electrical receiving groove 31 along the height direction of the vehicle device 100. When the cooling cover plate 43 and the cooling groove 42 are not properly sealed, because the opening of the cooling groove 42 faces away from the electrical receiving groove 31, the leakage of cooling water towards the inside of the electrical receiving groove 31 can be prevented, thereby protecting the components of the power supply integrated module such as the on-board charger 10 and the motor controller 20.

[0127] The cooling groove 42 of the electrical cover plate 40 can be formed by machining, and the cooling cover plate 43 can also be obtained by mechanical machining, thereby reducing the overall machining cost of the electrical cover plate 40. In one embodiment, the cooling groove 42 is formed by die casting.

[0128] In one embodiment, the electrical cover 40 includes an annular baffle 44 and a plurality of circuit board support posts 45. The annular baffle 44 and the plurality of circuit board support posts 45 extend from the electrical cover 40 toward the bottom of the electrical receiving groove 31 along the height direction of the vehicle-mounted device 100. The extension length of the plurality of circuit board support posts 45 is less than the extension length of the annular baffle 44, which surrounds the periphery of the plurality of circuit board support posts 45.

[0129] Multiple circuit board support pillars 45 are used to fix the first circuit board 11 of the on-board charger 10, and the first circuit board 11 is used to fix the electrical components of the on-board charger 10. An annular baffle 44 is used to fix the liquid cooling heat sink 50. The length of the circuit board support pillars 45 is shorter than that of the columnar reinforcing ribs 441, and the on-board charger 10 is closer to the electrical cover plate 40 than the liquid cooling heat sink 50. Thus, the liquid cooling heat sink 50, the on-board charger 10 and the electrical cover plate 40 are stacked sequentially along the height direction of the vehicle device 100, and the on-board charger 10 is fixed between the liquid cooling heat sink 50 and the electrical cover plate 40.

[0130] In one embodiment, the annular baffle 44 includes a plurality of columnar reinforcing ribs 441, which are spaced apart along the extension path of the plurality of circuit board support pillars 45 surrounding the annular baffle 44. The plurality of columnar reinforcing ribs 441 are used to improve the structural stability of the annular baffle 44. The annular baffle 44 also secures the liquid cooling heat sink 50 to the plurality of columnar reinforcing ribs 441. The electrical components of the on-board charger 10 and the first circuit board 11 are housed within the annular baffle 44, which is used to protect the on-board charger 10.

[0131] The annular baffle 44 includes a connecting post 442, the cross-sectional dimension of which is larger than the cross-sectional dimension of the other columnar reinforcing ribs 441. The electrical cover plate 40 is used to connect the liquid cooling heat sink 50 through the connecting post 442.

[0132] In one embodiment, the connecting post 442 includes a bottom surface 4421. The bottom surface 4421 of the connecting post 442 faces the water-cooled radiator 60 along the height direction of the vehicle-mounted device 100, and is used to abut against the liquid-cooled heat sink 50. Because the bottom surface 4421 of the connecting post 442 is parallel to the plane of the vehicle-mounted device 100, its area is relatively large. The contact area between the connecting post 442 and the liquid-cooled heat sink 50 is increased by abutting the bottom surface 4421, ensuring reliable fixation between the connecting post 442 and the liquid-cooled heat sink 50.

[0133] Thus, the first through hole 421 and the second through hole 422 penetrate the bottom surface 4421 of the connecting post 442. The first through hole 421 is used to connect to the inlet 51 of the liquid cooling heat sink 50, and the second through hole 422 is used to connect to the outlet 52 of the liquid cooling heat sink 50. The first through hole 421 and the second through hole 422 are respectively extended along the height direction of the vehicle-mounted device 100 to the bottom of the cooling tank 42.

[0134] Cooling water in the cooling tank 42 can be fed into the inlet 51 of the liquid cooling heat sink 50 through the first through hole 421, and then output from the outlet 52 of the liquid cooling heat sink 50 through the second through hole 422 and return to the cooling tank 42, forming a circulation of cooling water in the liquid cooling heat sink 50.

[0135] Along the planar direction of the vehicle-mounted device 100, the bottom surface 4421 of the connecting post 442 has a relatively large area, and the area where the bottom surface 4421 of the connecting post 442 contacts the liquid cooling heat sink 50 is correspondingly large. Two through holes on the bottom surface 4421 of the connecting post 442 are used to connect the inlet 51 and outlet 52 of the liquid cooling heat sink 50, respectively, facilitating a reliable seal between the connecting post 442 and the liquid cooling heat sink 50.

[0136] In subsequent embodiments of this application, a first through hole 421 and a second through hole 422 are further defined to be arranged along a second direction 002. The second direction 002 intersects with the first direction 001. In the illustrated embodiment, the second direction 002 is perpendicular to the first direction 001.

[0137] In one embodiment, along the second direction 002, the second through hole 422, the first through hole 421, the third through hole 423, and the fourth through hole 424 are arranged sequentially at intervals. Thus, the first through hole 421 is closer to the cover water channel inlet 401 of the vehicle-mounted device 100 than the second through hole 422 along the second direction 002. After entering the internal flow channel of the cover through the third through hole 423, the cooling water can first enter the inlet 51 of the liquid cooling heat sink 50 through the first through hole 421. At this time, the temperature of the cooling water is relatively low, thereby improving the heat dissipation effect of the liquid cooling heat sink 50. Combined with the flow path arrangement of the internal flow channel of the cover, the cooling water flowing out from the second through hole 422 then flows into the internal water inlet channel through the fourth through hole 424. This portion of the cooling water can flow through the orthogonal projection area of ​​multiple capacitor components and inductor components 12 on the electrical cover 40, to ensure the heat dissipation effect of the internal flow channel of the cover on the vehicle-mounted charger 10.

[0138] In one embodiment, along the first direction 001, the on-board charger 10, the first through hole 421, the second through hole 422, and the third through hole 423 are arranged sequentially at intervals. That is, the first through hole 421 and the second through hole 422 are arranged along the first direction 001 between the on-board charger 10 and the third through hole 423. Because the first through hole 421 and the second through hole 422 are both located within the projection area of ​​the connecting post 442, that is, the connecting post 442 is closer to the cover plate water channel inlet 401 of the electrical cover plate 40 than the on-board charger 10, after the cooling water enters the internal flow channel of the cover plate from the cover plate water channel inlet 401, it can enter the liquid cooling heat sink 50 through the first through hole 421 on the connecting post 442 to cool the on-board charger 10. At this time, the temperature of the cooling water is relatively low, which can improve the heat dissipation effect of the liquid cooling heat sink 50.

[0139] Please refer to Figure 15 for a partial structural schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application.

[0140] In one embodiment, the side of the liquid cooling heat sink 50 facing the electrical cover plate 40 is used to fix the heat sink nozzle 53. The heat sink nozzle 53 includes a first connecting water channel 531 and a second connecting water channel 532. The first connecting water channel 531 is used to connect the inlet 51 of the liquid cooling heat sink 50 and the first through hole 421. The second connecting water channel 532 is used to connect the outlet 52 of the liquid cooling heat sink 50 and the second through hole 422.

[0141] In this embodiment, the liquid cooling heat sink 50 and the electrical cover plate 40 are arranged parallel to each other and spaced apart. The heat sink nozzle 53 is fixed to the side of the liquid cooling heat sink 50 facing the electrical cover plate. Along the direction in which the electrical cover plate 40 and the liquid cooling heat sink 50 are stacked, one end of the heat sink nozzle 53 is used to connect the inlet 51 and the outlet 52 of the liquid cooling heat sink 50, and the other end of the heat sink nozzle 53 is used to connect the first through hole 421 and the second through hole 422, thereby introducing cooling water from the electrical cover plate 40 into the liquid cooling heat sink 50.

[0142] Please refer to Figure 16, which shows a partial structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 17, which shows an exploded structural diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0143] In one embodiment, the two ends of the heat sink nozzle 53 are distributed along the direction in which the electrical cover plate 40 and the liquid cooling heat sink 50 are stacked. Each end of the heat sink nozzle 53 includes two grooves. For ease of description, in this embodiment, one groove is defined as the first groove and the other as the second groove. The inlet of the first connecting water channel 531 and the outlet of the second connecting water channel 532 are located at the bottom of the first groove. The first groove covers the first through hole 421 and the second through hole 422. The inlet of the first connecting water channel 531 is used to connect to the first through hole 421, and the outlet of the second connecting water channel 532 is used to connect to the second through hole 422. The outlet of the first connecting water channel 531 and the inlet of the second connecting water channel 532 are located at the bottom of the second groove. The second groove covers the inlet 51 and the outlet 52 of the liquid cooling heat sink 50. The outlet of the first connecting water channel 531 is used to connect to the inlet 51 of the liquid cooling heat sink 50, and the inlet of the second connecting water channel 532 is used to connect to the outlet 52 of the liquid cooling heat sink 50.

[0144] In this embodiment, the two ends of the heat sink nozzle 53 are respectively connected to the liquid-cooled heat sink 50 and the electrical cover plate 40 through two grooves, thereby realizing the circulation of cooling water between the liquid-cooled heat sink 50 and the electrical cover plate 40. The first groove is used to accommodate the inlet 51 and outlet 52 of the liquid-cooled heat sink 50, and the groove wall of the first groove can form a sealing fit with the inlet 51 and outlet 52 of the liquid-cooled heat sink 50. The second groove is used to mate with the first through hole 421 and the second through hole 422, and the groove wall of the second groove can form a sealing fit with the first through hole 421 and the second through hole 422. The two grooves are used to prevent the cooling water from leaking into the electrical receiving groove 31.

[0145] In one embodiment, the second groove may also be formed on one side of the electrical cover plate 40. In this case, the electrical cover plate 40 accommodates the heat sink nozzle 53 through the structure of the second groove, and the groove wall of the second groove forms a sealing fit with the outer wall of the heat sink nozzle 53, thus achieving the same sealing connection effect. It is understood that in some embodiments, the first groove may also be formed on one side of the liquid cooling heat sink 50, and the groove wall of the first groove forms a sealing fit with the outer wall of the heat sink nozzle 53.

[0146] Please refer to Figure 18, which shows a partial structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 19, which shows a partial structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0147] In one embodiment, the bottom of the cooling tank 42 further includes a third through hole 423, a fourth through hole 424, and a first dividing protrusion 425. The third through hole 423 is used to connect the cover plate water channel inlet 401, the fourth through hole 424 is used to connect the cover plate water channel outlet 402, and the first dividing protrusion 425 is used to separate the third through hole 423 and the fourth through hole 424 to form a U-shaped flow channel.

[0148] In this embodiment, the first partition protrusion 425 is used to form a U-shaped flow channel in the internal flow channel of the cover plate, thereby increasing the flow path of cooling water in the internal flow channel of the cover plate, so that the cooling water can form a more sufficient heat exchange with the on-board charger 10 to improve the heat dissipation effect of the electrical cover plate 40.

[0149] In one embodiment, the bottom of the cooling tank 42 further includes a second dividing protrusion 426, which is used to separate the first through hole 421 and the second through hole 422. The third through hole 423 and the first through hole 421 are arranged between the first dividing protrusion 425 and the second dividing protrusion 426. The first through hole 421 and the third through hole 423 are arranged on one side of the second dividing protrusion 426, and the second through hole 422 is arranged on the other side of the second dividing protrusion 426.

[0150] In this embodiment, the third through hole 423 and the first through hole 421 are arranged between the first separating protrusion 425 and the second separating protrusion 426. The second separating protrusion 426 is used to separate the first through hole 421 and the second through hole 422. Cooling water entering the internal flow channel of the cover plate from the cover plate water channel inlet 401 through the third through hole 423 first flows into the liquid cooling heat sink 50 through the first through hole 421, then flows back into the internal flow channel of the cover plate through the second through hole 422, and then flows into the housing water channel inlet 301 from the cover plate water channel outlet 402 through the fourth through hole 424. This arrangement can ensure that the temperature of the cooling water flowing into the liquid cooling heat sink 50 is low, thereby improving the heat dissipation effect of the liquid cooling heat sink 50 on the multiple power modules 14.

[0151] In one embodiment, the bottom of the cooling tank 42 further includes a plurality of heat dissipation teeth 427 and a plurality of flow guiding teeth 428. The plurality of heat dissipation teeth 427 are distributed on both sides of the first dividing protrusion 425, and the plurality of flow guiding teeth 428 are distributed on both sides of the first dividing protrusion 425. At least one of the flow guiding teeth 428 or heat dissipation teeth 427 on both sides of the first dividing protrusion 425 is different in number, shape or arrangement.

[0152] In this embodiment, multiple heat dissipation teeth 427 are used to slow down the flow rate of cooling water in the internal flow channel of the cover plate to improve the heat exchange effect when the cooling water flows through the multiple heat dissipation teeth 427, and multiple guide teeth 428 are used to guide the cooling water to flow along the flow path in the internal flow channel of the cover plate. The multiple heat dissipation teeth 427 and multiple guide teeth 428 are arranged alternately in the internal flow channel of the cover plate, which can form heat dissipation zones of different numbers, sizes and regions in the internal flow channel of the cover plate, and each heat dissipation zone is matched with the number, shape and position of the electrical components of the on-board charger 10.

[0153] In one embodiment, each heat dissipation tooth 427 includes a plurality of columnar protrusions arranged in a generally arrayed manner along the planar direction of the electrical cover plate 40. Cooling water generates significant turbulence as it flows through the columnar protrusions, thereby promoting heat exchange between the cooling water components and balancing the temperature of the cooling water flowing through the heat dissipation tooth 427.

[0154] In one embodiment, each guide tooth 428 includes multiple strip-shaped ribs, the extension direction of each strip-shaped rib being approximately parallel to the flow path from the second through hole 422 to the fourth through hole 424, and the multiple strip-shaped ribs being arranged at intervals along the flow path perpendicular to the second through hole 422 to the fourth through hole 424. Cooling water experiences less flow resistance when flowing through the multiple strip-shaped ribs, allowing it to flow through the guide tooth 428 more quickly.

[0155] Multiple heat dissipation teeth 427 and multiple flow guiding teeth 428 are arranged at intervals along the flow path from the second through hole 422 to the fourth through hole 424, which can balance the temperature difference and flow rate of the cooling water and ensure the heat dissipation effect of the cooling water on multiple capacitor components, inductor components 12 and electrical components of the secondary circuit.

[0156] In one embodiment, along the height direction of the vehicle-mounted device 100, the orthographic projection of each capacitor assembly and inductor assembly 12 overlaps with at least one heat dissipation tooth 427.

[0157] In one embodiment, along the height direction of the vehicle-mounted device 100, the orthographic projection of a portion of the electrical components of the secondary side circuit overlaps with at least one heat dissipation tooth 427. In one embodiment, in the arrangement direction of the second through hole 422 and the fourth through hole 424, each side of the flow guiding structure includes at least one flow guiding tooth 428. In one embodiment, along the second direction 002, each side of the flow guiding structure includes at least one heat dissipation tooth 427.

[0158] In one embodiment, a section of the first separating protrusion 425 forms a notch 429 spaced apart from the second separating protrusion 426. Along the arrangement direction of the second through-hole 422 and the fourth through-hole 424, the notch 429 is located on the side of the flow guiding structure closer to the second through-hole 422. That is, along the second direction 002, the notch 429 is located between the second through-hole 422 and the flow guiding structure. Thus, a portion of the cooling water entering from the third through-hole 423 can flow directly into the internal flow channel of the cover plate through the notch 429. This portion of cooling water has a relatively low temperature. After merging with the cooling water flowing out from the liquid cooling heat sink 50, this portion of cooling water can improve the heat dissipation effect of the internal flow channel of the cover plate on the electrical components of the multiple capacitor components, inductor components 12, and secondary circuits. The water then flows into the internal flow channel of the bottom shell through the flow path from the second through-hole 422 to the fourth through-hole 424.

[0159] Please refer to FIG20 for a partial cross-sectional view of the vehicle-mounted device 100 provided in one embodiment of this application, FIG21 for a partial structural view of the vehicle-mounted device 100 provided in one embodiment of this application, and FIG22 for an exploded structural view of the vehicle-mounted device 100 provided in one embodiment of this application.

[0160] In one embodiment, the electrical receiving slot 31 is also used to receive a water-cooled radiator 60 and a second circuit board 21. The water-cooled radiator 60 is used to receive cooling water input from the housing water inlet 301. The second circuit board 21 is used to control the three-phase inverter circuit in the electrical components of the motor controller 20. The three-phase inverter circuit includes a bus capacitor module 22 and multiple power modules. In this embodiment, to facilitate the differentiation of the power module 14 of the on-board charger 10, the multiple power modules fixed on the second circuit board 21 are defined as second power modules 23. The first circuit board 11, the liquid-cooled heat sink 50, the second circuit board 21, the water-cooled radiator 60, and the bus capacitor module 22 are sequentially stacked between the electrical cover plate 40 and the bottom of the electrical receiving slot 31. The bus capacitor module 22 is used to fix the second circuit board 21 and the water-cooled radiator 60, and the multiple second power modules 23 are arranged between the second circuit board 21 and the water-cooled radiator 60.

[0161] In this embodiment, the motor controller 20 is arranged between the bottom of the electrical housing 31 and the liquid-cooled heat sink 50. The water-cooled heat sink 60 is used to dissipate heat from the multiple second power modules 23 of the motor controller 20 to ensure the reliable operation of the motor controller 20. The water-cooled heat sink 60 is used to receive cooling water input from the electrical cover plate 40 through the housing water channel inlet 301 of the integrated housing 30.

[0162] Therefore, the vehicle-mounted device 100 provided in this application includes a liquid-cooled heat sink 50 and a water-cooled radiator 60. The liquid-cooled heat sink 50 is used to cool the on-board charger 10, and the water-cooled radiator 60 is used to cool the motor controller 20. Under different operating scenarios, the on-board charger 10 and the motor controller 20 will continuously generate heat. By using the liquid-cooled heat sink 50 and the water-cooled radiator 60 to dissipate heat from the on-board charger 10 and the motor controller 20 respectively, the reliable operation of the vehicle-mounted device 100 provided in this application can be ensured.

[0163] In this embodiment, the arrangement direction of the integrated housing 30 and the electrical cover 40 is defined as the height direction of the vehicle-mounted device 100, and the direction perpendicular to the height direction of the vehicle-mounted device 100 is defined as the planar direction of the vehicle-mounted device 100. The on-board charger 10 and the motor controller 20 in the electrical receiving slot 31 are arranged at intervals along the height direction of the vehicle-mounted device 100. The on-board charger 10 is located between the electrical cover 40 and the motor controller 20.

[0164] Along the height of the on-board unit 100, the water-cooled radiator 60, the liquid-cooled heat sink 50, and the electrical cover 40 are stacked in sequence. The integrated housing 30 is used to fix the water-cooled radiator 60 and the electrical cover 40, and the electrical cover 40 is used to fix the on-board charger 10 and the liquid-cooled heat sink 50.

[0165] The vehicle-mounted device 100 provided in this application is connected to the circulating cooling system of the electric vehicle 200 through the cover plate water channel inlet 401 and the housing water channel outlet 302, and is connected to the liquid cooling heat sink 50 and the water cooling radiator 60 inside the housing, so that the liquid cooling heat sink 50 and the water cooling radiator 60 respectively form a circulating cooling effect for the on-board charger 10 and the motor controller 20.

[0166] In one embodiment, the integrated housing 30 includes a base plate 32 and multiple side plates 33. The base plate 32 and the side plates 33 are used to enclose and form an electrical receiving groove 31. The base plate 32 forms the bottom of the electrical receiving groove 31, and each side plate 33 forms the groove wall of the electrical receiving groove 31. The base plate 32 and the electrical cover plate 40 are arranged at intervals along the height direction of the vehicle-mounted device 100. The base plate 32 is located on the side of the water-cooled radiator 60 away from the electrical cover plate 40, and the distance between the base plate 32 and the electrical cover plate 40 is the height dimension of the electrical receiving groove 31. The side plates 33 are arranged between the base plate 32 and the electrical cover plate 40, and the side plates 33 are used to fix the base plate 32 and the electrical cover plate 40. That is, the base plate 32 supports the electrical cover plate 40, as well as the on-board charger 10 and the liquid-cooled radiator 50 fixed by the electrical cover plate 40, through the side plates 33.

[0167] The base plate 32 is used to fix the water-cooled radiator 60 and the motor controller 20. Specifically, the base plate 32 includes two columns that extend toward the water-cooled radiator 60 along the height direction of the vehicle-mounted device 100. The water-cooled radiator 60 is embedded in the motor controller 20 along the height direction of the vehicle-mounted device 100. The two columns are used to fix the water-cooled radiator 60 and support the motor controller 20 through the water-cooled radiator 60.

[0168] Please refer to Figure 23, which shows a partial cross-sectional view of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 24, which shows a partial cross-sectional view of the vehicle-mounted device 100 provided in one embodiment of this application; and Figure 25, which shows a partial cross-sectional view of the vehicle-mounted device 100 provided in one embodiment of this application.

[0169] In one embodiment, the bottom of the electrical receiving tank 31 further includes a first bottom water channel interface 311 and a second bottom water channel interface 312. The inlet 61 of the water-cooled radiator 60 is used to receive cooling water input from the housing water channel inlet 301 through the first bottom water channel interface 311, and the second bottom water channel interface 312 is used to receive cooling water output from the outlet 62 of the water-cooled radiator 60. The orientation of the first bottom water channel interface 311 and the orientation of the second bottom water channel interface 312 are the same as the orientation of the opening of the electrical receiving tank 31, while the orientation of the inlet 61 and the orientation of the outlet 62 of the water-cooled radiator 60 are opposite to the orientation of the opening of the electrical receiving tank 31. The inlet 61 of the water-cooled radiator 60 is used to embed the first bottom water channel interface 311, and the outlet 62 of the water-cooled radiator 60 is used to embed the second bottom water channel interface 312.

[0170] In this embodiment, the integrated housing 30 is used to communicate with the water-cooled radiator 60 through the first bottom water channel interface 311 and the second bottom water channel interface 312. The first bottom water channel interface 311 and the second bottom water channel interface 312 extend from the bottom of the electrical receiving tank 31 toward the water-cooled radiator 60, respectively. The inlet 61 and outlet 62 of the water-cooled radiator 60 are respectively embedded in the first bottom water channel interface 311 and the second bottom water channel interface 312, so that the inner wall of the first bottom water channel interface 311 and the outer wall of the inlet of the water-cooled radiator 60, and the inner wall of the second bottom water channel interface 312 and the outer wall of the outlet of the water-cooled radiator 60 are respectively sealed to prevent the cooling water from leaking into the electrical receiving tank 31.

[0171] In one embodiment, the integrated housing 30 further includes an internal water inlet channel, an internal water outlet channel, and a housing water outlet 302. The internal water inlet channel connects the housing water inlet 301 and the first bottom water interface 311, and the internal water outlet channel connects the second bottom water interface 312 and the housing water outlet 302. The housing water inlet 301 and the housing water outlet 302 are located on the same side outside the electrical receiving tank 31, and the orientation of the housing water outlet 302 is different from the orientation of the housing water inlet 301.

[0172] In this embodiment, the integrated housing 30 transports cooling water flowing into the housing water inlet 301 to the first tank bottom water interface 311 through its internal water inlet channel. The integrated housing 30 also transports cooling water flowing out of the water-cooled radiator 60 to the water-cooling system of the electric vehicle 200 through its internal water outlet channel. Because the housing water inlet 301 and the cover water inlet 401 are located on the same side of the electrical receiving tank 31, and the housing water outlet 302 and the cover water inlet 401 are also located on the same side of the electrical receiving tank 31, the water pipes of the electric vehicle 200's water-cooling system respectively input and receive cooling water from the housing on the same side of the vehicle-mounted device 100's housing. Since the two water pipes occupy the same side of the vehicle-mounted device 100's housing, the overall width of the vehicle-mounted device 100's housing is controlled.

[0173] The liquid-cooled heat sink 50 and the water-cooled radiator 60 are both plate-shaped. The stacked liquid-cooled heat sink 50 and water-cooled radiator 60 can save the area of ​​the vehicle-mounted device 100, that is, the area of ​​the vehicle-mounted device 100 in the planar direction is relatively small. The plate-shaped water-cooled radiator 60 has a large contact area with the motor controller 20, and the plate-shaped liquid-cooled heat sink 50 and electrical cover 40 also have a large contact area with the on-board charger 10. The water-cooled radiator 60 and the liquid-cooled heat sink 50 can respectively provide good heat dissipation for the motor controller 20 and the on-board charger 10.

[0174] The vehicle-mounted device 100 of this application further utilizes the integrated housing 30 and the internal flow channels of the cover plate to form a channel for cooling water, so as to connect the water-cooled radiator 60 and the liquid-cooled heat sink 50 respectively, avoiding the need to set up additional cooling water pipes inside or outside the housing of the vehicle-mounted device 100, thus saving the overall volume of the vehicle-mounted device 100.

[0175] In one embodiment, the orthographic projection of the on-board charger 10 along the height direction of the on-board device 100 overlaps with the internal flow channel of the cover plate. This allows the internal flow channel of the cover plate to dissipate heat from the on-board charger 10, creating the effect of the electrical cover plate 40 and the liquid cooling heat sink 50 dissipating heat from both sides of the on-board charger 10, further enhancing the heat dissipation capacity of the on-board device 100.

[0176] In one embodiment, the electrical cover plate 40 is used to fix a water channel connection component 70, which includes two ends. One end of the water channel connection component 70 is used to enclose the cover plate water channel inlet 401, and the other end of the water channel connection component 70 is used to receive cooling water delivered by the water cooling system of the electric vehicle 200 through a water pipe. The housing water channel outlet 302 of the integrated housing 30 is used to deliver cooling water to the water cooling system of the electric vehicle 200 through a water pipe.

[0177] In this embodiment, the electrical cover 40 is generally plate-shaped and is connected to the water pipe of the water cooling system via a water channel connection component 70, which facilitates a sealed fit between the cover and the water pipe. The housing water channel outlet 302 can be configured as a water nozzle, thereby directly connecting to and sealing the water pipe of the water cooling system.

[0178] Please refer to Figure 26, which shows a structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 27, which shows an exploded structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application; Figure 28, which shows a structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application; and Figure 29, which shows an exploded structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0179] In one embodiment, the vehicle-mounted device 100 further includes a drive motor 202 and a reducer. The housing of the vehicle-mounted device 100 also includes a motor end cover 34 and a reducer end cover 35. The integrated housing 30 further includes a motor receiving slot 341 and a reducer receiving slot 351. The motor receiving slot 341 is used to fix and receive the stator of the drive motor 202, and the motor end cover 34 is used to enclose the motor receiving slot 341. The reducer receiving slot 351 is used to receive the gear set of the reducer, and the reducer end cover 35 is used to enclose the reducer receiving slot 351. The motor receiving slot 341 and the reducer receiving slot 351 are arranged adjacent to each other along the axial direction of the drive motor 202. The slot opening orientation of the motor receiving slot 341 is opposite to that of the reducer receiving slot 351, and the slot opening orientation of the electrical receiving slot 31 is perpendicular to the slot opening orientation of the motor receiving slot 341 and the reducer receiving slot 351.

[0180] In this embodiment, the integrated housing 30 of the vehicle-mounted device 100 of this application further includes a motor receiving slot 341 and a reducer receiving slot 351. The integrated housing 30 is used to fix the stator of the drive motor 202. The motor end cover 34 and the reducer end cover 35 are used to fix the drive shaft of the reducer through bearings. The motor receiving slot 341 can accommodate the drive motor 202, and the reducer receiving slot 351 can accommodate the gear set of the reducer.

[0181] Therefore, in this embodiment, the on-board device 100 also integrates the powertrain of the electric vehicle 200. That is, the on-board device integrates the powertrain, the on-board charger 10, and the motor controller 20 into one unit, further improving the integration level of the on-board device 100 in this application. The integrated on-board charger 10 and motor controller 20 facilitate the on-board charger 10 receiving power from the power battery 201 and supplying it to the motor controller 20. The integrated motor controller 20 and drive motor 202 facilitate the motor controller 20 outputting three-phase AC power to drive the drive motor 202, and the drive motor 202 outputting driving force through a reducer to drive the electric vehicle 200.

[0182] In one embodiment, the housing of the on-board unit 100 is also integrally formed with the housing of the drive motor 202. The integrated housing 30 extends away from the electrical cover 40 and forms a motor receiving slot 341. The inner wall of the motor receiving slot 341 is used to fix the motor stator of the drive motor 202, and the motor receiving slot 341 is used to accommodate the drive motor 202. This structure can improve the integration of the on-board unit 100 and save internal space in the electric vehicle 200.

[0183] In one embodiment, the housing of the on-board unit 100 is also integrally formed with the housing of the reducer. The integrated housing 30 extends away from the electrical cover 40 and forms a reducer receiving groove 351. The reducer receiving groove 351 is also used to accommodate a gear set. The gear set is used to drive the motor shaft of the drive motor 202. In this embodiment, the housing of the on-board unit 100 and the housing of the powertrain are integrally formed, further improving the integration of the on-board unit 100 and saving internal space of the electric vehicle 200.

[0184] The orientation of the slot opening of the motor receiving slot 341 is opposite to that of the slot opening of the reducer receiving slot 351. The drive motor 202 and the reducer are arranged adjacent to each other along the axial direction of the drive motor 202, reducing the length of the vehicle-mounted device 100 along the axial direction of the drive motor 202. The orientation of the slot opening of the electrical receiving slot 31 is perpendicular to the orientation of both the motor receiving slot 341 and the reducer receiving slot 351. The electrical cover plate 40 of the vehicle-mounted device 100 is parallel to the axial direction of the drive motor 202 and is closer to the axis of the drive motor 202, reducing the height of the vehicle-mounted device 100 along the direction perpendicular to the electrical cover plate 40. The overall volume of the vehicle-mounted device 100 is further reduced.

[0185] Please refer to Figure 30, which shows a structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 31, which shows a structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0186] In one embodiment, the side plate 33 is used to form the wall of the electrical receiving groove 31. The wall of the electrical receiving groove 31 includes a first groove wall 331, a second groove wall 332, a third groove wall 333, and a fourth groove wall 334. The first groove wall 331 and the second groove wall 332 are arranged opposite each other along the axial direction of the drive motor 202, and the third groove wall 333 and the fourth groove wall 334 are arranged opposite each other along an axial direction perpendicular to the drive motor 202. The distance between the first section of the groove wall 331 and the opening of the motor receiving groove 341 is greater than the distance between the second section of the groove wall 332 and the opening of the motor receiving groove 341. The distance between the third section of the groove wall 333 and the motor shaft of the drive motor 202 is less than the distance between the fourth section of the groove wall 334 and the motor shaft of the drive motor 202. The power battery interface 101 of the vehicle device 100 is distributed in the first section of the groove wall 331. The load power supply interface 102 of the vehicle device 100 is distributed in the second section of the groove wall 332. The control signal interface 103 of the vehicle device 100 is distributed in the third section of the groove wall 333. The shell water channel outlet 302 and the shell water channel inlet 301 are distributed on the outside of the fourth section of the groove wall 334.

[0187] In this embodiment, the second section of the groove wall 332 and the first section of the groove wall 331 are arranged sequentially along the direction from the motor end cover 34 toward the reducer end cover 35. The vehicle-mounted device 100 receives power from the power battery or supplies power to the power battery through the power battery interface 101 on the first section of the groove wall 331, and supplies power to the load of the electric vehicle 200 through the load power supply interface 102 on the second section of the groove wall 332.

[0188] Along the axial direction perpendicular to the drive motor 202, the fourth section of the groove wall 334 is offset relative to the third section of the groove wall 333 towards one side of the drive motor 202. The fourth section of the groove wall 334 and the output wheel of the gear set of the reducer, which is used to output power, are arranged adjacent to each other along the axial direction of the drive motor 202. The electrical receiving groove 31 can make full use of the space on the side of the drive motor 202 facing the output wheel of the reducer, so as to reduce the overall width of the vehicle-mounted device 100. The vehicle-mounted device 100 receives or sends control signals from the electric vehicle 200 through the control signal interface 103 on the third section of the groove wall 333. The vehicle-mounted device 100 receives cooling water supplied by the water cooling system through the cover water channel inlet 401 on the fourth section of the groove wall 334, and supplies cooling water to the cooling system through the shell water channel outlet 302 on the fourth section of the groove wall 334.

[0189] Please refer to Figure 32 for a partial structural schematic diagram of a vehicle-mounted device 100 provided in one embodiment of this application.

[0190] In one embodiment, the bottom of the cooling tank 42 includes two regions. A first region 42A and a second region 42B are defined in FIG32. The first region 42A and the second region 42B are arranged adjacent to each other along a first direction 001. The orthographic projections of a plurality of capacitor components and inductor components 12 are housed in the first region 42A. The orthographic projections of the electrical components of the secondary circuit are housed in the second region 42B.

[0191] Along the height direction of the vehicle-mounted device 100, the depth of the first region 42A of the cooling groove 42 is less than the depth of the second region 42B. In this embodiment, by setting the bottom of the second region 42B of the cooling groove 42 of the electrical cover plate 40 to sink towards the small circuit board 13, the distance between the internal flow channel of the cover plate and the electrical components of the secondary circuit can be reduced, ensuring that the electrical cover plate 40 provides better heat dissipation for the electrical components of the secondary circuit.

[0192] Please refer to Figure 33, which shows a partial structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application, and Figure 34, which shows a partial exploded structural schematic diagram of the vehicle-mounted device 100 provided in one embodiment of this application.

[0193] The internal water inlet channel includes the internal flow channel of the side plate 33 and the internal flow channel of the bottom plate 32. The side plate 33 is used to fix the bottom plate 32 and the electrical cover plate 40, and the internal flow channel of the side plate 33 is used to connect the cover plate water channel outlet 402 and the internal flow channel of the bottom plate 32. Specifically, the side plate 33 includes a top surface facing the electrical cover plate 40, and the top surface of the side plate 33 is used to abut and fix the bottom surface of the electrical cover plate 40. The top surface of the side plate 33 includes the housing water channel inlet 301. In this embodiment, the internal flow channel connecting the side plate 33 and the housing water channel inlet 301 is defined as the first connecting hole 335, that is, the first connecting hole 335 is constructed as a section of the internal water inlet channel. The first connecting hole 335 is a blind hole, and the first connecting hole 335 extends from the housing water channel inlet 301 toward the bottom plate 32 along the height direction of the vehicle device 100. The first connecting hole 335 is formed as part of the internal flow channel of the side plate 33 and is used to communicate with the internal flow channel of the bottom plate 32.

[0194] Along the height direction of the vehicle-mounted device 100, the housing water channel inlet 301 is aligned with the cover water channel outlet 402, thereby enabling communication between the internal flow channel and the internal water inlet channel of the cover. Thus, the internal flow channel of the base plate 32 is also connected to the cover water channel inlet 401 of the electrical cover plate 40 through the first connecting hole 335.

[0195] The top surface of the side plate 33 is sealed to the bottom surface of the electrical cover 40. In one embodiment, the outer edges of the housing water channel inlet 301 and the cover water channel outlet 402 include a sealing ring. The sealing ring is partially embedded in the top surface of the side plate 33 or partially embedded in the bottom surface of the electrical cover 40. When the electrical cover 40 is attached to the top surface of the side plate 33, the top surface of the side plate 33 and the bottom surface of the electrical cover 40 are sealed by compressing the sealing ring. The vehicle-mounted device 100 of this application achieves a sealed connection between the internal flow channel and the internal water inlet channel of the cover plate simultaneously through the assembly of the electrical cover 40 and the integrated housing 30.

[0196] The base plate 32 supports the water-cooled radiator 60 and the motor controller 20 via two columns. A first bottom water channel interface 311 and a second bottom water channel interface 312 are formed inside the two columns, respectively. The internal flow channels of the base plate 32 also serve as the inlet 61 and outlet 62 of the water-cooled radiator 60 through the first bottom water channel interface 311 and the second bottom water channel interface 312. Specifically, a bottom water channel interface is formed on the top surface of each column facing the water-cooled radiator 60. The bottom water channel interface is a blind hole, extending from the top surface of the column along the height direction of the vehicle-mounted device 100 towards the base plate 32. The internal flow channels of the base plate 32 connect the two bottom water channel interfaces respectively.

[0197] One of the columns has a bottom water channel interface for accommodating and securing the inlet 61 of the water-cooled radiator 60, and the other column has a bottom water channel interface for accommodating and securing the outlet 62 of the water-cooled radiator 60. Specifically, for ease of description, the two columns of the base plate 32 are defined as a first column 361 and a second column 362. The first column 361 includes a first bottom water channel interface 311, and the second column 362 includes a second bottom water channel interface 312. The first column 361 is used to connect to the inlet 61 of the water-cooled radiator 60 through the first bottom water channel interface 311, and the second column 362 is used to connect to the outlet 62 of the water-cooled radiator 60 through the second bottom water channel interface 312.

[0198] The base plate 32 includes two connecting holes, which are defined as a second connecting hole 321 and a third connecting hole 322 in this embodiment. The second connecting hole 321 and the third connecting hole 322 are blind holes, extending from one side surface of the base plate 32 toward the interior of the base plate 32. In one embodiment, the second connecting hole 321 and the third connecting hole 322 extend from the side surface of the base plate 32 near the side plate 33 having the first connecting hole 335 toward the interior of the base plate 32. The extending directions of the second connecting hole 321 and the third connecting hole 322 are parallel to a first direction 001.

[0199] The second connecting hole 321 and the third connecting hole 322 form the internal flow channels of the base plate 32. The second connecting hole 321 forms a section of the internal water inlet channel, and the third connecting hole 322 forms a section of the internal water outlet channel. The second connecting hole 321 connects the first connecting hole 335 and the first bottom channel interface 311, and the third connecting hole 322 connects the second bottom channel interface 312 and the shell channel outlet 302.

[0200] Specifically, the second connecting hole 321 extends along the first direction 001, and the first bottom water channel interface 311 and the first connecting hole 335 extend along the height direction of the vehicle-mounted device 100, respectively. Cooling water entering the first connecting hole 335 from the internal flow channel of the cover plate can sequentially enter the inlet 61 of the water-cooled radiator 60 through the second connecting hole 321 and the first bottom water channel interface 311.

[0201] The second bottom water channel interface 312 extends along the height direction of the vehicle-mounted device 100, and the third connecting hole 322 extends along the first direction 001. The cooling water flowing out of the outlet 62 of the water-cooled radiator 60 can flow into the third connecting hole 322 through the second bottom water channel interface 312, and then flow out of the internal water outlet channel from the shell water channel outlet 302.

[0202] The first bottom water channel interface 311, the second bottom water channel interface 312, and the first connecting hole 335 can be machined downwards from the top surface of the first column 361, the top surface of the second column 362, and the top surface of the side plate 33, respectively. The second connecting hole 321 and the third connecting hole 322 are machined from the side of the bottom plate 32 near the side plate 33 towards the interior of the bottom plate 32. The integrated housing 30 also includes a plug for sealing the opening of the second connecting hole 321 formed on the side of the bottom plate 32 to prevent cooling water from leaking from the side of the bottom plate 32.

[0203] In one embodiment, the opening formed by the third connecting hole 322 on the side of the base plate 32 can be configured as the housing water channel outlet 302 of the vehicle-mounted device 100. In another embodiment, the housing water channel outlet 302 is disposed on the side of the side plate 33, and the third connecting hole 322 also connects to the housing water channel outlet 302 through the internal flow channel of the side plate 33. That is, the side plate 33 includes the housing water channel outlet 302, which is used to connect to the water-cooled radiator 60 through the internal flow channel of the side plate 33 and the internal flow channel of the base plate 32.

[0204] In the illustrated embodiment, the base plate 32 includes a boss 37. The boss 37 is located between the side plate 33 and the water-cooled radiator 60 along a first direction 001. The boss 37 is connected to the side plate 33 and includes two connecting holes. One connecting hole extends along the first direction 001 and penetrates the side plate 33, serving as the housing water channel outlet 302 of the vehicle-mounted device 100. The other connecting hole extends along the height direction of the vehicle-mounted device 100 and connects to a third connecting hole 322 and the housing water channel outlet 302.

[0205] In the figure, another connecting hole within the boss 37, used to connect the third connecting hole 322 and the shell water channel outlet 302, is defined as the fourth connecting hole 323. The fourth connecting hole 323 is used to form a section of the internal water outlet channel. The fourth connecting hole 323 can be machined downwards from the top surface of the boss 37, while the shell water channel outlet 302 is machined from the side of the side plate 33 towards the boss 37.

[0206] In one embodiment, the integrated housing 30 includes two additional plugs. One of the additional plugs is used to seal the opening formed by the third connecting hole 322 on the side of the base plate 32, and the other of the additional plugs is used to seal the opening formed by the fourth connecting hole 323 on the top surface of the boss 37.

[0207] Thus, the internal water inlet channel connects to the internal flow channel of the base plate 32 through the internal flow channel of the side plate 33, and the water-cooled radiator 60 is connected in series in the internal flow channel of the base plate 32. The internal flow channel of the base plate 32 also connects to the housing water channel outlet 302 of the vehicle-mounted device 100 through the internal flow channel of the side plate 33. Since each section of the internal flow channel of the base plate 32 and the side plate 33 extends inward from the exposed surface of the base plate 32 or the side plate 33, each section of the internal flow channel of the base plate 32 and the side plate 33 can be formed by processing, thereby reducing the processing cost of the integrated housing 30. In addition, the openings of the second connecting hole 321, the third connecting hole 322 and the housing water channel outlet 302 are respectively formed on the side of the side plate 33 away from the electrical receiving groove 31, which can avoid the risk of cooling water leakage inside the electrical receiving groove 31.

[0208] In some embodiments, the internal flow channels of some sections of the internal flow channels in the base plate 32 and the side plate 33 can be integrally cast with the integrated housing 30, thereby improving the sealing performance of the internal flow channels in the integrated housing 30 and preventing cooling water leakage in the integrated housing 30.

[0209] Based on the above description of various embodiments of the integrated housing 30, in one embodiment, the specific flow path of the cooling water in the integrated housing 30 is as follows: it flows sequentially through the first connecting hole 335 into the second connecting hole 321, the first bottom channel interface 311, and the inlet 61. After cooling the motor controller 20 within the water-cooled radiator 60, the cooling water flows sequentially through the outlet 62 into the second bottom channel interface 312, the third connecting hole 322, and the fourth connecting hole 323, and finally flows out from the housing channel outlet 302. Thus, the water-cooled radiator 60 is connected in series in the internal flow channel of the base plate 32. The cooling water flowing in from the internal flow channel of the side plate 33 can flow into the water-cooled radiator 60 through the first bottom channel interface 311 and then out of the water-cooled radiator 60 through the second bottom channel interface 312, thereby achieving continuous cooling of the motor controller 20 by the water-cooled radiator 60.

[0210] Please refer to FIG35 for a partial exploded view of the vehicle-mounted device 100 provided in one embodiment of this application, and FIG36 for a partial cross-sectional view of the vehicle-mounted device 100 provided in one embodiment of this application.

[0211] The motor controller 20 includes multiple second power modules 23, a bus capacitor module 22, and a second circuit board 21. The bus capacitor module 22, the multiple second power modules 23, and the second circuit board 21 are arranged sequentially at intervals along the height direction of the vehicle-mounted device 100. The bus capacitor module 22, the multiple second power modules 23, and the second circuit board 21 are electrically connected. The multiple second power modules 23 are used to convert the direct current (DC) power from the power battery 201 into alternating current (AC) power to drive the drive motor 202.

[0212] The bus capacitor module 22 is located between the multiple second power modules 23 and the base plate 32. The bus capacitor module 22 houses multiple capacitors of the motor controller 20 and is arranged between the water-cooled radiator 60 and the base plate 32 along the height direction of the vehicle-mounted device 100. The bus capacitor module 22 is also arranged between two pillars along the planar direction of the vehicle-mounted device 100. The second circuit board 21 is used to mount the electrical components of the motor controller 20. The second circuit board 21 is arranged between the water-cooled radiator 60 and the liquid-cooled heat sink 50 along the height direction of the vehicle-mounted device 100. That is, along the height direction of the vehicle-mounted device 100, the water-cooled radiator 60 and the multiple second power modules 23 are arranged together between the bus capacitor module 22 and the second circuit board 21.

[0213] The second power module 23 is one of the main heat sources of the motor controller 20. The water-cooled radiator 60 is mainly used to dissipate heat from the second power module 23. Specifically, the water-cooled radiator 60 includes two heat dissipation plates. In the schematic diagram, the two heat dissipation plates are defined as the first heat dissipation plate 63 and the second heat dissipation plate 64, respectively. The first heat dissipation plate 63 and the second heat dissipation plate 64 are arranged at intervals along the height direction of the vehicle-mounted device 100, and the gap between the first heat dissipation plate 63 and the second heat dissipation plate 64 is used to accommodate multiple second power modules 23 of the motor controller 20.

[0214] The first heat sink 63 and the second heat sink 64 each include internal flow channels. The internal flow channels of the first heat sink 63 and the second heat sink 64 are connected in parallel between the inlet 61 and the outlet 62 of the water-cooled radiator 60. The water-cooled radiator 60 can dissipate heat from both sides of the second power module 23 through the two heat sinks, thereby improving the heat dissipation effect of the water-cooled radiator 60 on the second power module 23.

[0215] Along the height direction of the vehicle-mounted device 100, the surface of the first heat sink 63 facing away from the second power module 23 faces the second circuit board 21 of the motor controller 20, and the surface of the second heat sink 64 facing away from the second power module 23 faces the bus capacitor module 22. The first heat sink 63 and the second heat sink 64 also provide heat dissipation for the second circuit board 21 and the bus capacitor module 22 respectively, further improving the overall heat dissipation effect of the water-cooled radiator 60 on the motor controller 20.

[0216] That is, the water-cooled radiator 60 is arranged along the height direction of the vehicle-mounted device 100 on the side of the second power module 23 away from the second circuit board 21. The water-cooled radiator 60 also includes a first heat sink 63, which is embedded between the second power module 23 and the second circuit board 21 along the height direction of the vehicle-mounted device 100. The first heat sink 63 is used to dissipate heat from the second power module 23 and the second circuit board 21 respectively, so as to improve the heat dissipation effect of the water-cooled radiator 60 on the motor controller 20.

[0217] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations. The above embodiments are only used to illustrate the technical solutions of this application, and not to limit it; 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of this application.

Claims

A vehicle-mounted device with water-cooled heat dissipation, characterized in that, The housing of the vehicle-mounted device comprises an integrated housing and an electrical cover plate, the integrated housing comprises an electrical accommodation groove, the electrical cover plate is used to enclose the electrical accommodation groove, the electrical accommodation groove is used to accommodate electrical components of at least one of a vehicle-mounted charger or a motor controller, wherein: The integrated housing comprises a housing waterway inlet, the electrical cover plate comprises a cover plate waterway inlet, a cover plate internal flow channel and a cover plate waterway outlet, the cover plate internal flow channel is used to receive cooling water through the cover plate waterway inlet, and the cover plate internal flow channel is used to deliver the cooling water to the housing waterway inlet through the cover plate waterway outlet; The housing waterway inlet is distributed on the outside of the electrical accommodation groove, the cover plate waterway inlet and the cover plate waterway outlet are distributed on the side of the electrical cover plate facing the electrical accommodation groove, the direction of the cover plate waterway inlet is opposite to the direction of the slot opening of the electrical accommodation groove, and the direction of the housing waterway inlet is the same as the direction of the slot opening of the electrical accommodation groove. The in-vehicle device according to claim 1, characterized by The electrical accommodation groove is also used to accommodate a first circuit board, the side of the electrical cover plate facing the electrical accommodation groove is used to fix the first circuit board, the side of the first circuit board facing the electrical cover plate is used to fix a capacitor component and an inductor component in the electrical components of the vehicle-mounted charger, and the side of the electrical cover plate facing the first circuit board comprises a plurality of shielding protrusions, which are respectively embedded in the gaps of other electrical components of the vehicle-mounted charger. The in-vehicle device according to claim 2, characterized by The electrical accommodation groove is also used to accommodate a liquid cooling heat dissipation plate, the cover plate internal flow channel is used to communicate with an internal flow channel of the liquid cooling heat dissipation plate, the first circuit board is arranged between the liquid cooling heat dissipation plate and the electrical cover plate, and the side of the first circuit board facing the liquid cooling heat dissipation plate is used to fix a plurality of power modules and the liquid cooling heat dissipation plate in the electrical components of the vehicle-mounted charger. The in-vehicle device according to claim 3, characterized by The electrical accommodation groove is also used to accommodate a water-cooled heat sink and a second circuit board, the water-cooled heat sink is used to receive cooling water input by the housing waterway inlet, and the second circuit board is used to control a three-phase inverter circuit in the electrical components of the motor controller, the three-phase inverter circuit comprising a bus capacitor module and a plurality of power modules, wherein: The first circuit board, the liquid cooling heat dissipation plate, the second circuit board, the water-cooled heat sink and the bus capacitor module in the electrical accommodation groove are sequentially stacked between the electrical cover plate and the bottom of the electrical accommodation groove, the bus capacitor module is used to fix the second circuit board and the water-cooled heat sink, and the plurality of power modules are arranged between the second circuit board and the water-cooled heat sink. The in-vehicle device according to claim 4, characterized by The electrical cover plate comprises a cooling groove and a cooling cover plate, the cooling groove is distributed on the side of the electrical cover plate away from the electrical accommodation groove, the cooling cover plate is used to enclose the cooling groove to form the cover plate internal flow channel, the bottom of the cooling groove comprises a first through hole and a second through hole, the first through hole and the second through hole respectively penetrate the bottom of the cooling groove, the first through hole is used to communicate with the inlet of the liquid cooling heat dissipation plate, and the second through hole is used to communicate with the outlet of the liquid cooling heat dissipation plate. The in-vehicle device according to claim 5, characterized by The side of the liquid cooling heat dissipation plate facing the electrical cover plate is used to fix a heat dissipation plate water nozzle, the heat dissipation plate water nozzle comprises a first communication water channel and a second communication water channel, the first communication water channel is used to communicate the inlet of the liquid cooling heat dissipation plate and the first through hole, and the second communication water channel is used to communicate the outlet of the liquid cooling heat dissipation plate and the second through hole. The in-vehicle device according to claim 6, characterized by The two ends of the heat dissipation plate water nozzle are distributed along the direction of the electrical cover plate and the liquid cooling heat dissipation plate, and the two ends of the heat dissipation plate water nozzle respectively comprise two grooves, wherein: The inlet of the first communication water channel and the outlet of the second communication water channel are distributed on the groove bottom of one of the two grooves, the one groove is used to cover the first through hole and the second through hole, the inlet of the first communication water channel is used to butt joint the first through hole, and the outlet of the second communication water channel is used to butt joint the second through hole; The outlet of the first communication water channel and the inlet of the second communication water channel are distributed on the groove bottom of the other of the two grooves, the other groove is used to cover the inlet of the liquid cooling heat dissipation plate and the outlet of the liquid cooling heat dissipation plate, the outlet of the first communication water channel is used to butt joint the inlet of the liquid cooling heat dissipation plate, and the inlet of the second communication water channel is used to butt joint the outlet of the liquid cooling heat dissipation plate. The in-vehicle device according to claim 5, characterized by The groove bottom of the cooling tank further comprises a third through hole, a fourth through hole and a first separation protrusion, the third through hole is used to communicate the cover plate water channel inlet, the fourth through hole is used to communicate the cover plate water channel outlet, and the first separation protrusion is used to separate the third through hole and the fourth through hole to form a U-shaped flow channel. The in-vehicle device according to claim 8, characterized by The groove bottom of the cooling tank further comprises a second separation protrusion, the second separation protrusion is used to separate the first through hole and the second through hole, the third through hole and the first through hole are arranged between the first separation protrusion and the second separation protrusion, the first through hole and the third through hole are arranged on one side of the second separation protrusion, and the second through hole is arranged on the other side of the second separation protrusion. The in-vehicle device according to claim 9, characterized by The groove bottom of the cooling tank further comprises a plurality of heat dissipation teeth and a plurality of flow guide teeth, wherein: The plurality of heat dissipation teeth are distributed on both sides of the first separation protrusion, the plurality of flow guide teeth are distributed on both sides of the first separation protrusion, and at least one of the number, shape or arrangement of the flow guide teeth or the heat dissipation teeth on both sides of the first separation protrusion is different. The in-vehicle device according to claim 4, characterized by The groove bottom of the electrical containing groove further comprises a first groove bottom water channel interface and a second groove bottom water channel interface, the inlet of the water-cooled heat sink is used to receive the cooling water input by the shell water channel inlet through the first groove bottom water channel interface, and the second groove bottom water channel interface is used to receive the cooling water output by the outlet of the water-cooled heat sink, wherein: The direction of the first groove bottom water channel interface and the direction of the second groove bottom water channel interface are the same as the direction of the groove opening of the electrical containing groove, the direction of the inlet of the water-cooled heat sink and the direction of the outlet of the water-cooled heat sink are opposite to the direction of the groove opening of the electrical containing groove, the inlet of the water-cooled heat sink is used to embed the first groove bottom water channel interface, and the outlet of the water-cooled heat sink is used to embed the second groove bottom water channel interface. The in-vehicle device according to claim 11, characterized by The integrated housing further comprises an internal water inlet channel for connecting the housing water inlet and the first tank bottom water channel interface, an internal water outlet channel for connecting the second tank bottom water channel interface and the housing water outlet, and a housing water channel outlet, wherein: The housing water inlet and the housing water outlet are distributed on the same side of the electrical accommodation tank, and the housing water outlet has a different orientation than the housing water inlet. The in-vehicle device according to claim 12, characterized by The electrical cover plate is used to fix a water channel connecting assembly, the water channel connecting assembly comprises two ends, one end of the two ends of the water channel connecting assembly is used to enclose the cover plate water inlet, the other end of the two ends of the water channel connecting assembly is used to receive the cooling water delivered by the water cooling system of the electric vehicle through the water pipe, and the housing water outlet of the integrated housing is used to deliver the cooling water to the water cooling system of the electric vehicle through the water pipe. The in-vehicle device according to claim 13, characterized by The vehicle-mounted device further comprises a driving motor and a speed reducer, the housing of the vehicle-mounted device further comprises a motor end cover and a speed reducer end cover, the integrated housing further comprises a motor accommodation tank and a speed reducer accommodation tank, the motor accommodation tank is used to fix and accommodate the stator of the driving motor, the motor end cover is used to enclose the motor accommodation tank, the speed reducer accommodation tank is used to accommodate the gear set of the speed reducer, and the speed reducer end cover is used to enclose the speed reducer accommodation tank, wherein: The motor accommodation tank and the speed reducer accommodation tank are arranged adjacent to each other along the axial direction of the driving motor, the opening direction of the motor accommodation tank is opposite to the opening direction of the speed reducer accommodation tank, and the opening direction of the electrical accommodation tank is perpendicular to the opening direction of the motor accommodation tank and the opening direction of the speed reducer accommodation tank. The slot wall of the electrical accommodation tank comprises a first segment slot wall, a second segment slot wall, a third segment slot wall and a fourth segment slot wall, the first segment slot wall and the second segment slot wall are arranged opposite to each other along the axial direction of the driving motor, the third segment slot wall and the fourth segment slot wall are arranged opposite to each other along the direction perpendicular to the axial direction of the driving motor, the distance between the first segment slot wall and the opening of the motor accommodation tank is greater than the distance between the second segment slot wall and the opening of the motor accommodation tank, the distance between the third segment slot wall and the motor shaft of the driving motor is smaller than the distance between the fourth segment slot wall and the motor shaft of the driving motor, the power battery interface of the vehicle-mounted device is distributed on the first segment slot wall, the load power supply interface of the vehicle-mounted device is distributed on the second segment slot wall, the control signal interface of the vehicle-mounted device is distributed on the third segment slot wall, and the housing water outlet and the housing water inlet are distributed on the outside of the fourth segment slot wall. An electric vehicle, characterized by The electric vehicle comprises a power battery and a vehicle-mounted device as claimed in any one of claims 1-14, and the vehicle-mounted device is used to charge the power battery or to drive the wheels by using the power supply of the power battery.

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