WO2023115526A1 - Electric motor controller and heat dissipation system thereof - Google Patents

Abstract

Provided in the present invention are an electric motor controller and a heat dissipation system thereof, particularly relating to the technical field of new energy automobiles. The heat dissipation system of the electric motor controller of the present invention comprises a housing, a first main flow channel, a second main flow channel and a heat dissipation substrate, wherein the housing is provided with a liquid inlet and a liquid outlet, the first main flow channel is in communication with the liquid inlet, and the second main flow channel is in communication with the liquid outlet; the heat dissipation substrate is arranged in the housing, and a plurality of heat dissipation fins are arranged at the bottom of the heat dissipation substrate; and a sealing cavity is defined between the heat dissipation substrate and the housing, the sealing cavity is in communication with the first main flow channel and the second main flow channel, and the plurality of heat dissipation fins divide the sealing cavity into a plurality of cooling flow channels provided in parallel. By using the electric motor controller of the heat dissipation system in the present invention, a plurality of power modules can be respectively cooled, so that the cooling effect of the electric motor controller is improved.

Description

A motor controller and its cooling system technical field

The invention relates to the technical field of new energy vehicles, in particular to a motor controller and a cooling system thereof.

Background technique

With the development of the new energy industry and the advancement of new energy vehicle technology, the electric drive system is one of the core components of the power output of new energy vehicles, and its requirements for light weight, miniaturization, high torque density and high power density are also of growth. The motor controller is an important part of the electric drive system. In an electric vehicle, the function of the motor controller is to control the starting operation, forward and backward speed, climbing force and other driving states of the electric vehicle according to the gear position, accelerator, brake and other instructions. , or it will help electric vehicles brake and store part of the braking energy in the power battery.

As the core component of electric vehicles, the motor controller directly affects the quality of electric vehicles. Most of the heating of the control system is caused by the heat loss of the power device, and the power device is sensitive to temperature. If the temperature is too high, it will affect the performance of the controller, and even cause irreversible damage to the power device, affecting the performance of the controller. Normal use. Since the heat generation of power components such as IGBT (insulated gate bipolar transistor chip) is relatively concentrated, how to effectively reduce its operating temperature and prolong its service life has become a research hotspot in the electric vehicle industry around the world.

At present, there are three cooling and heat dissipation methods for motor controllers: natural cooling, air cooling, and water cooling. Natural cooling is to install heat dissipation fins on the surface or stick a heat dissipation module label on the controller shell to dissipate heat, and the heat dissipation efficiency is low. Air cooling uses a cooling fan for cooling, which leads to the motor controller's uncompact structure, high noise, and insufficient heat dissipation when running at high power. The water cooling is tightly connected and packaged with the water cooling plate and the power device. Once water seeps into the controller, it will cause a great safety accident, resulting in personal safety and property loss. Therefore, the existing motor controller does not have a cooling system or the structure of the cooling system may lead to insufficient heat dissipation area of the IGBT components, busbar components and capacitor components, poor heat exchange efficiency, and poor overall heat dissipation effect, resulting in the motor controller housing Internal components have a low service life. Therefore, it is necessary to develop a new cooling system to solve the above problems.

Contents of the invention

In view of the above shortcomings of the prior art, the present invention provides a motor controller and its cooling system to improve the cooling problem of the motor controller.

In order to achieve the above purpose and other related purposes, the present invention provides a heat dissipation system for a motor controller, which includes a housing, a first main channel, a second main channel and a heat dissipation substrate, and the housing is provided with a liquid inlet and an outlet. The liquid port, the first main channel communicates with the liquid inlet; the second main channel communicates with the liquid outlet; the heat dissipation substrate is arranged in the housing, and its bottom is provided with a number of heat dissipation ribs sheet; a sealed cavity is formed between the heat dissipation substrate and the housing, the sealed cavity communicates with the first main flow channel and the second main flow channel, and the plurality of heat dissipation fins connect the sealed cavity The body is divided into multiple cooling channels arranged in parallel.

In an example of the present invention, the sealed cavity includes a distribution cavity and a collection cavity, the distribution cavity communicates with the first main flow channel, the collection cavity communicates with the second main flow channel, and the cooling flow channel One end communicates with the distribution cavity, and the other end communicates with the collection cavity.

In an example of the present invention, the heat dissipation fins include first heat dissipation fins and second heat dissipation fins, the first heat dissipation fins protrude from the lower surface of the heat dissipation substrate, and the first heat dissipation ribs The sheet extends from one end of the first main flow channel to the direction of the second main flow channel, the second heat dissipation fin protrudes from the side wall of the first heat dissipation fin, and the adjacent first heat dissipation fin The second heat dissipation fins on the fins are arranged alternately.

In an example of the present invention, a cavity sealing ring is provided in the sealed cavity, one side of the cavity sealing ring is in contact with the heat dissipation substrate, and the other side is in contact with the bottom plate of the housing; The shape of the cavity sealing ring matches the shape of the sealing cavity, the cavity sealing ring is arranged around the outer periphery of the heat dissipation fins, and the cavity sealing ring is made of elastic material.

In an example of the present invention, the cavity sealing ring is a composite material of elastic material.

In an example of the present invention, a flow channel gasket is provided at the bottom of the sealed cavity, and the internal structure of the flow channel gasket is consistent with the arrangement structure of the plurality of heat dissipation fins. Between the heat dissipation fins and the bottom plate of the housing.

In an example of the present invention, a spoiler structure is provided in the cooling channel, and the spoiler structure is arranged on the heat dissipation substrate and/or the housing.

In an example of the present invention, the spoiler structure includes a cylindrical spoiler column, and the spoiler column is arranged at a corner of the cooling channel.

In an example of the present invention, the first main channel and the second main channel are integrated with the housing, at least part of the first main channel is located below the sealed cavity, and at least part of the The second main channel is located below the sealed cavity, the liquid inlet and the liquid outlet are located on different side walls of the housing, at least part of the first main channel and at least part of the second main channel Parallel setting.

In an example of the present invention, a plurality of heat dissipation substrates are arranged in parallel in the housing, and a sealed cavity is formed between each of the heat dissipation substrates and the housing, and each of the sealed cavities Both communicate with the first main channel and the second main channel.

Another aspect of the present invention also provides a motor controller, including a heat dissipation system and electronic components and single-chip microcomputers installed in the heat dissipation system. The heat dissipation system includes a housing, a first main flow channel, a second main flow channel and a cooling The substrate, the housing is provided with a liquid inlet and a liquid outlet, the first main flow channel is connected to the liquid inlet; the second main flow channel is connected to the liquid outlet; the heat dissipation substrate is set Inside the housing, a number of heat dissipation fins are provided at the bottom; a sealed cavity is formed between the heat dissipation substrate and the housing, and the sealed cavity communicates with the first main channel and the second As for the main channel, the plurality of cooling fins divide the sealed cavity into a plurality of cooling channels arranged in parallel.

In an example of the present invention, the electronic components include a first power module, a second power module and a third power module arranged on the heat dissipation substrate.

In an example of the present invention, the heat dissipation substrate includes a first heat dissipation substrate, a second heat dissipation substrate, and a third heat dissipation substrate respectively corresponding to the first power module, the second power module, and the third power module. The cavity includes a first sealed cavity, a second sealed cavity and a third sealed cavity respectively corresponding to the first power module, the second power module and the third power module, the first sealed cavity, the second sealed cavity Both the second sealed cavity and the third sealed cavity communicate with the first main channel and the second main channel.

In the heat dissipation system of the motor controller of the present invention, a first main flow channel connected to the liquid inlet and a second main flow channel connected to the liquid outlet are arranged in the controller housing, and the heat dissipation substrate and the heat dissipation substrate are connected by the heat dissipation fins provided on the heat dissipation substrate. The sealed cavity surrounded by the shell is divided into multiple cooling channels, and one end of the cooling channel communicates with the first main channel, and the other end communicates with the second main channel, and the cooling medium enters each cooling channel through the first main channel , and then discharged through the second main channel. When the cooling medium flows through, the heat generated by the power module can be taken away to keep it within a normal temperature range and maintain a normal working state. The invention adopts direct water cooling to cool the power module, improves the heat exchange efficiency, and avoids heat dissipation dead zone. A cavity sealing ring is set in the sealing cavity, and it is installed between the heat dissipation substrate and the shell bottom plate by squeezing the cavity sealing ring, which is used to seal the heat dissipation cavity; a flow channel gasket is set in the sealing cavity, which can Adjacent cooling channels are isolated to prevent the fluids in adjacent cooling channels from moving each other and affect the heat dissipation effect of the heat dissipation system; a turbulence structure is set in the cooling channel, and the turbulence structure can strengthen the flow of local liquid and increase the solid-liquid interaction. The heat dissipation area for heat transfer increases the cross-sectional area of solid heat conduction and heat transfer, and improves heat exchange efficiency; the heat dissipation system can be provided with multiple heat dissipation substrates arranged side by side, and each heat dissipation substrate and the shell form a cooling plate. The cavity is sealed, so that multiple power modules in the motor controller are cooled separately, and the cooling effect is better. The present invention also provides a motor controller including the above-mentioned heat dissipation system. The motor controller adopts a parallel arrangement of multiple power modules, and each power module corresponds to a sealed cavity for cooling, so as to avoid serial cooling of the stator and rotor. The heat dissipation path is long, and the heat dissipation effect at the end of the heat dissipation path is poor, which cannot meet the heat dissipation requirements.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural view of a heat dissipation system of a motor controller of the present invention in an embodiment;

Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the heat dissipation system of the motor controller of the present invention;

Fig. 3 is a partial cross-sectional view of the heat dissipation system of the motor controller of the present invention in an embodiment;

Fig. 4 is a schematic cross-sectional structure diagram of the cooling channel in an embodiment of the heat dissipation system of the motor controller of the present invention;

Fig. 5 is a structural schematic diagram of a cavity sealing ring in an embodiment of the heat dissipation system of the motor controller of the present invention;

FIG. 6 is a schematic structural view of the flow channel gasket in an embodiment of the heat dissipation system of the motor controller of the present invention;

FIG. 7 is a schematic diagram of a heat dissipation fin and a flow turbulence structure in an embodiment of the heat dissipation system of the motor controller of the present invention.

Fig. 8 is a structural schematic diagram of an embodiment of the motor controller of the present invention;

FIG. 9 is a schematic cross-sectional structure diagram of an embodiment of the motor controller of the present invention.

Component designation description

100. Shell; 101. Liquid inlet; 102. Liquid outlet; 103. First main flow channel; 104. Second main flow channel; 105. Liquid inlet pipe; 106. Liquid outlet pipe; 200. Heat dissipation substrate; 201. 202, the second heat dissipation fin; 203, the cooling channel; 204, the spoiler structure; 210, the first heat dissipation substrate; 220, the second heat dissipation substrate; 230, the third heat dissipation substrate; 300, sealing Cavity; 301, cavity sealing ring; 302, flow channel gasket; 310, distribution cavity; 320, collection cavity; 400, power module; 401, first power module; 402, second power module; 403, third power module.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementations, not for limiting the protection scope of the present invention. The test methods for which specific conditions are not indicated in the following examples are usually in accordance with conventional conditions, or in accordance with the conditions suggested by each manufacturer.

It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

Please refer to FIG. 1 to FIG. 9 , the purpose of the present invention is to provide a motor controller and its heat dissipation system to improve the heat dissipation of the motor controller.

Please refer to FIG. 1 to FIG. 3 , the present invention provides a heat dissipation system for a motor controller including a housing 100 , a first main flow channel 103 , a second main flow channel 104 and a heat dissipation substrate 200 , and the housing 100 is provided with a liquid inlet 101 and the liquid outlet 102 , the first main channel 103 is arranged inside the casing 100 and communicates with the liquid inlet 101 ; the second main channel 104 is arranged inside the casing 100 and communicates with the liquid outlet 102 . The heat dissipation substrate 200 is arranged in the casing, and a plurality of heat dissipation fins are provided at the bottom thereof, and a sealed cavity 300 is formed between the heat dissipation substrate 200 and the casing 100, and the sealed cavity 300 communicates with the first main flow channel 103 and the second main flow channel 104 , a plurality of cooling fins divide the sealed cavity 300 into a plurality of cooling channels 203 arranged in parallel.

Please refer to FIG. 3 and FIG. 4 , in one embodiment, the sealed chamber 300 further includes a distribution chamber 310 and a collection chamber 320 , the distribution chamber 310 communicates with the first main channel 103 , and the collection chamber 320 communicates with the second main channel 104 , The cooling channel 203 is located between the distribution cavity 310 and the collection cavity 320 , one end of which communicates with the distribution cavity 310 , and the other end communicates with the collection cavity 320 . Cooling medium, such as cooling water, enters the first main flow channel 103 from the liquid inlet 101, enters the distribution cavity 310 through the first main flow channel 103, and then divides into each cooling flow channel 203 by the distribution cavity 310, and enters at the end of the cooling flow channel 203 The pooling cavity 320 collects, and then enters the second main channel 104 from the pooling cavity 320, and discharges the motor controller through the liquid outlet 102, and enters the motor controller again after being cooled by the intercooler outside the motor controller for cooling cycle. During the circulation of the cooling medium, the heat generated by the electronic components in the motor controller that is in contact with the heat dissipation system, especially the heat dissipation substrate, can be taken away, so that it can always be kept within the normal temperature range, ensuring that the motor controller normal work.

Please refer to Fig. 1 and Fig. 2, in one embodiment, the casing 100 is a shell-like structure with a high periphery and a concave downward in the middle, inside which are provided support ribs for installing electronic components, a liquid inlet 101 and a liquid outlet 102 The liquid inlet 101 is connected with a liquid inlet pipe 105 , and the liquid outlet 102 is connected with a liquid outlet pipe 106 . One end of the first main flow channel 103 communicates with the liquid inlet 101, and the other end extends toward the direction of the liquid outlet 102, and the end of the first main flow channel 103 extending toward the liquid outlet 102 direction is closed; the second main flow channel 104 One end communicates with the liquid outlet 102 , the other end extends toward the liquid inlet 101 , and one end of the second main channel 104 extending toward the liquid inlet 101 is closed. The first main channel 103 is at least partly located below the sealed cavity 300, the second main channel 104 is at least partly located below the sealed cavity 300, and the part of the first main channel 103 located below the sealed cavity 300 is connected to the second main channel. The parts of 104 located below the sealed cavity 300 are parallel to each other.

In this embodiment, the part of the first main channel 103 located below the sealed cavity 300 is provided with a first connecting passage extending upward and communicating with the distribution chamber 310 , the first connecting channel is along the flow direction of the first main channel 103 The length corresponds to the size of the distribution cavity 310 in this direction, and the part of the second main channel 103 located below the sealed cavity 300 is provided with a second connecting channel extending upward and communicating with the collecting cavity 320, and the second connecting channel is along the second main channel. The length of the channel 104 in the channel direction corresponds to the size of the collecting chamber 320 in this direction. The cooling liquid that enters the first main flow channel 103 from the liquid inlet 101 enters the distribution chamber 310 through the first connecting channel, and then divides into each cooling flow channel 203 through the distribution cavity 310, and the cooling liquid flows through each cooling flow channel 203 in the collection chamber 320 Collected, enter the second main channel 104 through the second connecting channel, and be discharged from the liquid outlet 102. Preferably, the first main channel 103 and the second main channel 104 are integrated with the housing 100 , for example, the first main channel 103 and the second main channel 104 are cast integrally with the housing 100 .

Please refer to Fig. 2 to Fig. 4, the supporting rib of the housing 100 is provided with a downwardly recessed installation cavity, the two ends of the bottom of the installation cavity communicate with the first main flow channel 103 and the second main flow channel 104 respectively, and the heat dissipation substrate 200 presses Installed on the installation cavity and form a sealed cavity 300 therewith. For example, the heat dissipation substrate 200 is screwed to the housing 100, that is, the heat dissipation substrate 200 and the housing 100 are provided with threaded holes correspondingly, and the screws are used to pass through the threaded holes on the heat dissipation substrate 200 and the housing 100 in turn to fix the heat dissipation substrate 200 in the installation cavity. above.

Please refer to Fig. 3 and Fig. 7, in one embodiment, several cooling fins are arranged on the lower surface of the heat dissipation substrate 200, the cooling fins include a plurality of first cooling fins 201 and second cooling fins 202, the first cooling ribs The fins 201 protrude from the lower surface of the heat dissipation substrate 200, and the first heat dissipation fins 201 extend from the first main flow channel 103 to the second main flow channel 104, and between every two adjacent first heat dissipation fins 201 A cooling channel 203 is formed. The second heat dissipation fins 202 protrude from the side wall of the first heat dissipation fins 201. One end of the second heat dissipation fins 202 is connected to the first heat dissipation fins 201, and the other end extends toward the cooling channel 203. Preferably, The second heat dissipation fins 202 are arranged vertically to the first heat dissipation fins 201 , and the second heat dissipation fins 202 on adjacent first heat dissipation fins 201 are arranged alternately. Such setting makes the cooling channel 203 have an S-shaped structure, which can increase the heat dissipation area and improve the heat dissipation efficiency.

Please refer to FIG. 4 and FIG. 5 , in one embodiment, a cavity sealing ring 301 is provided in the sealing cavity 300 , and the shape of the cavity sealing ring 301 matches the shape of the sealing cavity 300 . During installation, the cavity sealing ring 301 is installed close to the side wall of the sealing cavity 300, its upper surface is connected with the heat dissipation substrate 200, and its lower surface is connected with the bottom wall of the housing 100, relying on the upper surface of the cavity sealing ring 301 and the lower surface The compression of the surface seals the sealed cavity 300 . Preferably, the cavity sealing ring 301 is made of flexible composite material, such as nitrile rubber, fluororubber and the like.

Please refer to FIG. 3 , FIG. 4 and FIG. 6 , in an embodiment, a flow channel gasket 302 may also be provided in the sealed cavity 300 , and the internal structure of the flow channel gasket 302 corresponds to the distribution of heat dissipation fins on the heat dissipation substrate 200 . During installation, the flow channel sealing gasket 302 is placed in the installation cavity of the housing 100 first, and the heat dissipation substrate 200 is closed and pressed tightly. The flow channel sealing gasket 302 isolates the adjacent cooling flow channels 203 to prevent the cooling media in the adjacent cooling flow channels 203 from moving with each other and affect the overall heat dissipation effect.

Please refer to FIG. 7. In one embodiment, a spoiler structure 204 is also provided in the cooling channel 203, which can be arranged on the heat dissipation substrate 200 or on the housing. The material of the spoiler structure 204 is the same as that of the heat dissipation substrate. 200 of the same material. The turbulence structure 204 is arranged in each cooling channel 203, which can increase the turbulence of the cooling liquid, destroy the boundary layer of the cooling liquid, form a secondary flow, aggravate the degree of turbulent flow, generate more turbulent flow, and increase the heat dissipation area; The flow form is influenced while the flow velocity of the cooling liquid is kept constant, so that the cooling liquid is fully in contact with the cooling flow channel 203 , so that convective heat exchange occurs between the fluid and the cooling flow channel 203 , thereby enhancing the heat exchange capacity. Preferably, the spoiler structure 204 includes cylindrical spoiler posts arranged at intervals, and the size of the spoiler posts can be set according to the size of the cooling channel 203 . Preferably, the spoiler column is arranged at the corner of the cooling channel 203 , since there is a dead zone at the corner, setting the spoiler column here can strengthen the flow of the liquid here, and prevent poor heat dissipation effect at the corner. Certainly, in other embodiments, the spoiler column may also be in a drop shape or other suitable structures.

Please refer to FIG. 2 to FIG. 4. In one embodiment, a plurality of installation cavities are arranged side by side in the housing 100, and a heat dissipation substrate 200 is placed in each installation cavity, and each heat dissipation substrate 200 forms a sealed cavity with the corresponding installation cavity. Body 300 , the heat dissipation fins at the bottom of heat dissipation substrate 200 are distributed in the structure described above, and each sealed cavity 300 is divided into a plurality of cooling channels distributed in parallel. The number of cooling passages 203 in each sealed cavity 300 can be set according to the heat dissipation in this area. The cavity sealing cavity 301, the flow channel sealing gasket 302 and the spoiler structure 204 are selected and installed according to the specific conditions of the power module in the motor controller.

Referring to Fig. 1, Fig. 3 and Fig. 8, the present invention also provides a motor controller, which includes a heat dissipation system, a plurality of electronic components and single-chip microcomputers installed on the heat dissipation system. Wherein the cooling system adopts the cooling system of the present invention. The electronic components include a plurality of power modules 400, such as IGBT power modules. The power modules 400 are installed on the heat dissipation substrate 200, and the power modules 400 are generated by using the cooling medium flowing in the cooling channel 203 between the heat dissipation substrate 200 and the housing 100. heat away.

Please refer to FIG. 1 and FIG. 9 , in an embodiment, the power module 400 is installed in parallel with multiple modules, and each module corresponds to a sealed cavity 300 enclosed by the heat dissipation substrate 200 and the housing 100 as a heat dissipation area. For example, the power module 400 includes a first power module 401, a second power module 402, and a third power module 403 arranged in sequence, and the heat dissipation system includes The first heat dissipation substrate 210, the second heat dissipation substrate 220, and the third heat dissipation substrate 230 of the module 403, the first heat dissipation substrate 210 and the housing 100 form a first sealed cavity, and the second heat dissipation substrate 220 and the housing 100 form a first sealed cavity. Two sealed cavities, the third heat dissipation substrate 230 and the housing 100 form a third sealed cavity, the setting of the cooling channel 203 in the first sealed cavity, the second sealed cavity and the third sealed cavity and the sealing of the cavities The installation of the ring 301 and the flow channel gasket 302 can be selected according to the heat output of the respective corresponding power modules. For example, the second power module 402 is located between the first power module 401 and the third power module 403, affected by the power modules on both sides, the heat production of the second power module 402 is higher than that of the power modules on both sides, so , the second sealed cavity can be double-sealed by the cavity sealing ring 301 and the flow channel gasket 302 to improve the heat dissipation effect in this area, or increase the cooling medium by increasing the cooling flow channel 203 in the second sealed cavity The flow rate increases its cooling effect. Of course, the first sealed cavity and the third sealed cavity can be set according to specific conditions.

Other unspecified structures of the motor controller in the present invention can be realized by existing structures in the art, and will not be described in detail here.

The invention provides a heat dissipation system for a motor controller. By setting heat dissipation ribs on the heat dissipation substrate, the sealed cavity between the heat dissipation substrate and the housing is divided into a plurality of parallel cooling channels, and the cooling channels The two ends are respectively connected with the first main channel and the second main channel, and the cooling medium entering through the liquid inlet enters each cooling channel through the first main channel, collects into the second main channel through the cooling channel, and then is discharged from the body. During this process, the cooling medium can take away the heat generated by the electronic components in the motor controller, keeping it within a normal temperature range. Using the motor controller of the heat dissipation system of the present invention, the power modules are cooled in parallel, the cooling medium from the main channel is divided into the area where each power module is located, and each power module is cooled separately to avoid heat dissipation caused by serial cooling of the stator and rotor The problem of long path and poor heat dissipation effect at the end of the heat dissipation path. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (12)

1. A cooling system for a motor controller, characterized in that it comprises:

   The housing is provided with a liquid inlet and a liquid outlet;

   The first main channel communicates with the liquid inlet;

   The second main channel communicates with the liquid outlet;

   A heat dissipation substrate is arranged in the housing, and a plurality of heat dissipation fins are provided at the bottom thereof;

   Wherein, a sealed cavity is formed between the heat dissipation substrate and the housing, the sealed cavity communicates with the first main flow channel and the second main flow channel, and the plurality of heat dissipation fins connect the sealed cavity The body is divided into multiple cooling channels arranged in parallel.
2. The heat dissipation system according to claim 1, wherein the sealed cavity comprises a distribution cavity and a collection cavity, the distribution cavity communicates with the first main flow channel, and the collection cavity communicates with the second main flow channel One end of the cooling channel communicates with the distribution cavity, and the other end communicates with the collection cavity.
3. The heat dissipation system according to claim 1, wherein the heat dissipation fins comprise first heat dissipation fins and second heat dissipation fins, the first heat dissipation fins protrude from the lower surface of the heat dissipation substrate, And the first heat dissipation fins extend from the first main flow channel to the second main flow channel, the second heat dissipation fins protrude from the side wall of the first heat dissipation fins, and the adjacent The second heat dissipation fins on the first heat dissipation fins are arranged alternately.
4. The heat dissipation system according to claim 1, wherein a cavity sealing ring is provided in the sealed cavity, one side of the cavity sealing ring is in contact with the heat dissipation substrate, and the other side is in contact with the housing. The bottom plate of the body is connected; the shape of the cavity sealing ring matches the shape of the sealing cavity, the cavity sealing ring is arranged around the outer periphery of the heat dissipation fins, and the cavity sealing ring is made of elastic material.
5. The heat dissipation system according to claim 1, wherein the bottom of the sealed cavity is provided with a flow channel gasket, the internal structure of the flow channel gasket is consistent with the arrangement structure of the plurality of heat dissipation fins, The flow channel sealing gasket is located between the heat dissipation fins and the bottom plate of the housing.
6. The heat dissipation system according to claim 1, wherein a spoiler structure is arranged in the cooling channel, and the spoiler structure is arranged on the heat dissipation substrate and/or the casing.
7. The heat dissipation system according to claim 6, wherein the spoiler structure comprises a cylindrical spoiler column, and the spoiler column is arranged at a corner of the cooling channel.
8. The heat dissipation system according to claim 1, wherein the first main channel and the second main channel are integrated with the housing, and at least part of the first main channel is located in the sealed cavity body, at least part of the second main channel is located under the sealed cavity, the liquid inlet and the liquid outlet are located on different side walls of the housing, at least part of the first main channel and At least part of the second main channels are arranged in parallel.
9. The heat dissipation system according to claim 1, wherein the casing is provided with a plurality of heat dissipation substrates arranged side by side, and a sealed cavity is formed between each of the heat dissipation substrates and the casing, Each of the sealed cavities communicates with the first main channel and the second main channel.
10. A motor controller, characterized in that it includes: a heat dissipation system and electronic components and single-chip microcomputers installed on the heat dissipation system, and the heat dissipation system includes,

    The housing is provided with a liquid inlet and a liquid outlet;

    The first main channel communicates with the liquid inlet;

    The second main channel communicates with the liquid outlet;

    A heat dissipation substrate is arranged in the housing, and a plurality of heat dissipation fins are provided at the bottom thereof;

    Wherein, a sealed cavity is formed between the heat dissipation substrate and the housing, the sealed cavity communicates with the first main flow channel and the second main flow channel, and the plurality of heat dissipation fins connect the sealed cavity The body is divided into multiple cooling channels arranged in parallel.
11. The motor controller according to claim 10, wherein the electronic components include a first power module, a second power module and a third power module mounted on the heat dissipation substrate.
12. The motor controller according to claim 11, wherein the heat dissipation substrate comprises a first heat dissipation substrate, a second heat dissipation substrate and a heat dissipation substrate respectively corresponding to the first power module, the second power module and the third power module. The third heat dissipation substrate, the sealed cavity includes a first sealed cavity, a second sealed cavity and a third sealed cavity respectively corresponding to the first power module, the second power module, and the third power module, so The first sealed cavity, the second sealed cavity and the third sealed cavity are all in communication with the first main channel and the second main channel.

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