Liquid-cooled power module for motor controller, motor controller, powertrain, and electric vehicle

Abstract

The present application provides a liquid-cooled power module for a motor controller, a motor controller, a powertrain, and an electric vehicle. The liquid-cooled power module comprises an inverter module and a heat dissipation plate. The heat dissipation plate comprises two side surfaces; the two side surfaces face away from each other in the thickness direction of the heat dissipation plate; one side surface is used for fixing a plurality of power modules of a three-phase bridge arm of the inverter module, and the other side surface is used for enclosing another heat dissipation plate to form a liquid-cooled heat dissipation cavity; the other side surface comprises a recess and a plurality of heat dissipation teeth; the recess is oriented along the thickness direction of the heat dissipation plate toward the plurality of power modules; each heat dissipation tooth extends from the bottom of the recess along the stacking direction of the power modules and the heat dissipation plate; and the extension length of each of at least some of the heat dissipation teeth is greater than the depth of the recess. A downwardly oriented recess and a plurality of downwardly sunken heat dissipation teeth are formed on the other side surface, thereby increasing the heat dissipation area, improving the cooling efficiency, enhancing the integration density of the heat dissipation plate, reducing the volume of the liquid-cooled power module, and thus allowing for miniaturization of the motor controller.

Description

Liquid-cooled power module for motor controller, motor controller, power assembly and electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202421563511.X, filed on July 3, 2024, and entitled "Liquid-cooled power module for motor controller, motor controller, power assembly and electric vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power assembly, and in particular, to a liquid-cooled power module for motor controller, a motor controller, a power assembly and an electric vehicle. BACKGROUND

[0003] In the field of electric vehicles, a power assembly includes a motor controller and a motor. The motor controller supplies power to the motor to drive the wheels to move. The motor controller includes a bus capacitor, a power module, a radiator, and a circuit board, and many other electronic and electrical components. The number of components is large, the assembly is complex, and the integration of the radiator is low, resulting in a large size of the motor controller. SUMMARY

[0004] The present application provides a liquid-cooled power module for motor controller, a motor controller, a power assembly and an electric vehicle.

[0005] In a first aspect, the present application provides a liquid-cooled power module for motor controller. The motor controller is used to control the motor of an electric vehicle to drive the wheels of the electric vehicle. The liquid-cooled power module includes an inverter module and a heat sink. The inverter module includes a three-phase bridge arm. The three-phase bridge arm is used to receive power supply from a power battery of the electric vehicle and output three-phase current to drive the motor of the electric vehicle. The three-phase bridge arm includes a plurality of power modules. The heat sink includes two sides. The two sides are opposite to each other along the thickness direction of the heat sink. One side is used to fix the plurality of power modules of the three-phase bridge arm. The other side is used to enclose another heat sink to form a liquid-cooled heat dissipation cavity. The other side includes a groove and a plurality of heat dissipation teeth. The recess direction of the groove is towards the plurality of power modules of the three-phase bridge arm along the thickness direction of the heat sink. Each heat dissipation tooth extends from the groove bottom along the stacking direction of each power module and the heat sink. The extension length of each of at least part of the plurality of heat dissipation teeth is greater than the depth of the groove.

[0006] In the embodiment of the present application, the other side is used to enclose the other heat sink to form a liquid cooling heat dissipation cavity, the other side comprises a groove and a plurality of heat dissipation teeth, and the groove formed by the heat dissipation teeth of the heat sink can supply the cooling liquid to flow through, so that the contact area between the cooling liquid and the plurality of heat dissipation teeth is larger, so that the area of the heat sink in contact with the cooling liquid is larger, so that the heat sink has a larger heat dissipation space, which is beneficial to improve the cooling effect of the heat sink on the plurality of power modules. The other side comprises a groove and a plurality of heat dissipation teeth, compared with arranging the heat dissipation teeth directly on the other side of the heat sink, the plurality of heat dissipation teeth of the heat sink are arranged in a way of sinking along the recess direction of the groove, which can reduce the thickness of the heat sink, reduce the weight of the heat sink, and also save the space of the heat sink along the thickness direction. The groove formed by the heat dissipation teeth of the heat sink can supply the cooling liquid to flow through, and also make the integration of the heat sink and the plurality of power modules of the three-phase bridge arm higher, which is beneficial to the miniaturization of the liquid cooling power module, and further beneficial to the miniaturization layout of the motor controller.

[0007] In the embodiment of the present application, the recess direction of the groove is along the thickness direction of the heat sink towards the plurality of power modules of the three-phase bridge arm, so that the groove bottom is thinner, even if the plurality of heat dissipation teeth extend from the groove bottom along the stacking direction of each power module and the heat sink, the thickness of the heat sink can be thinner, which is beneficial to weight reduction and saving space of the heat sink along the thickness direction. The recess direction of the groove is along the thickness direction of the heat sink towards the plurality of power modules of the three-phase bridge arm, which can also make the cooling liquid flowing through the groove carry away the heat of the plurality of power modules faster through the heat sink with thinner thickness, and improve the heat dissipation efficiency.

[0008] In the embodiment of the present application, each heat dissipation tooth extends from the groove bottom along the stacking direction of each power module and the heat sink, which can make the heat dissipation tooth and the cooling liquid flowing in the liquid cooling heat dissipation cavity have more contact area, increase the heat dissipation area of the heat sink, and is beneficial to improve the heat dissipation efficiency of the heat sink on the power module and guarantee the operation safety of the liquid cooling power module in the motor controller.

[0009] In the embodiments of the present application, the extension length of each of the at least part of the heat dissipation teeth is greater than the depth of the groove, the length of the at least part of the heat dissipation teeth is longer, so that the heat dissipation teeth can make full use of the space in the depth direction of the groove, contact the cooling liquid as much as possible, form a larger heat dissipation area, and improve the cooling effect of the heat dissipation plate on the plurality of power modules. If the extension length of each of the at least part of the heat dissipation teeth is less than the depth of the groove, when the cooling liquid flows in the groove, there is a gap between the tooth surface of the plurality of heat dissipation teeth and the other heat dissipation plate, so that the cooling liquid flows in the gap between the tooth surface and the other heat dissipation plate, thereby reducing the stirring and turbulence effect of the heat dissipation teeth on the cooling liquid, and the cooling effect is poor. Only when the extension length of each of the at least part of the heat dissipation teeth is greater than the depth of the groove, the processing difficulty of the other side surface can be reduced.

[0010] In an embodiment, one side surface includes a protrusion, the protrusion away from the protrusion of the other side surface in the recess direction of the groove, and the protrusion is used for fixing the plurality of power modules and is stacked with the plurality of heat dissipation teeth in the recess direction of the groove.

[0011] In the embodiments of the present application, one side surface includes a protrusion, the protrusion away from the protrusion of the other side surface in the recess direction of the groove, and the protrusion is used for fixing the plurality of power modules, so that the plurality of power modules are spaced apart from the surface of one side surface except the protrusion, the electrical influence of the heat dissipation plate on the plurality of power modules is avoided, the plurality of power modules can work normally, and the running safety performance of the liquid-cooled power module in the motor controller is improved.

[0012] In the embodiments of the present application, the protrusion is stacked with the plurality of heat dissipation teeth in the recess direction of the groove, so that although the protrusion increases the thickness of the heat dissipation plate, the heat dissipation teeth of the other side surface are recessed from the other side surface, the thickness of the area where the heat dissipation teeth are located and the groove bottom is small, so that the overall thickness of the heat dissipation plate will not be large, and the thickness of the heat dissipation plate in the thickness direction is small under the condition that the electrical influence of the heat dissipation plate on the plurality of power modules is reduced. The protrusion is stacked with the plurality of heat dissipation teeth in the recess direction of the groove, which is also beneficial to shorten the distance between the flow channels of the plurality of heat dissipation teeth and the plurality of power modules fixed by the protrusion in the recess direction of the groove, so that the cooling liquid flowing between the plurality of heat dissipation teeth can better dissipate heat for the plurality of power modules fixed by the protrusion, and the heat dissipation efficiency is improved.

[0013] In an embodiment, in the recess direction of the groove, the thickness of the protrusion is less than or equal to the depth of the groove.

[0014] In the embodiments of the present application, the thickness of the protrusion is less than or equal to the depth of the groove in the recess direction of the groove, so that the overall thickness of the heat sink is small, which is conducive to reducing the weight of the heat sink and also conducive to making the overall volume of the liquid-cooled power module small, thereby facilitating the miniaturization of the liquid-cooled power module in the motor controller.

[0015] In an embodiment, the thickness of the protrusion is less than the extension length of each of the at least part of the heat dissipation teeth in the recess direction of the groove.

[0016] In the embodiments of the present application, the at least part of the heat dissipation teeth refers to the heat dissipation teeth with an extension length greater than the depth of the groove. The thickness of the protrusion is less than the extension length of each of the at least part of the heat dissipation teeth in the recess direction of the groove. The extension length of the heat dissipation teeth is large, so that the contact area of the cooling liquid with the heat dissipation teeth is large, so that the cooling efficiency of the cooling liquid on the heat dissipation teeth is improved, thereby reducing the overall thickness of the heat sink while improving the heat dissipation effect of the heat dissipation teeth on the power module.

[0017] In an embodiment, the thickness of the protrusion is greater than or equal to 1mm in the recess direction of the groove.

[0018] In the embodiments of the present application, the thickness of the protrusion is greater than or equal to 1mm in the recess direction of the groove, so that the part of the side surface other than the protrusion has a large enough spacing between the protrusion and the plurality of power modules fixed by the protrusion, avoiding the electrical influence of the heat sink on the plurality of power modules, allowing the plurality of power modules to work normally, and improving the safety performance of the liquid-cooled power module in the motor controller.

[0019] In an embodiment, the length of a heat sink in the width direction thereof is less than the length of a heat sink in the length direction thereof. In the width direction of the heat sink, the width of the protrusion is less than the width of the groove, and the width of the protrusion is greater than half the width of the groove. The width of the protrusion is less than the width of the power module fixed thereto, and the width of the protrusion is greater than half the width of the power module fixed thereto.

[0020] In the length direction of the heat sink, the length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half the length of the groove. The length of the protrusion is less than the sum of the lengths of the plurality of power modules fixed thereto, and the length of the protrusion is greater than half the sum of the lengths of the plurality of power modules fixed thereto.

[0021] In the embodiments of the present application, the length of a heat sink in the width direction thereof is less than the length of a heat sink in the length direction thereof, so that the plurality of power modules can be arranged in the length direction of the heat sink.

[0022] In the embodiment of the present application, the width of the protrusion is less than the width of the groove along the width direction of the heat sink, and the width of the protrusion is greater than half the width of the groove, so that the width of the protrusion does not exceed the width of the groove, and the protrusion does not excessively occupy the space of the heat sink along the width direction, which is beneficial to the miniaturization of the heat sink. The width of the groove is greater than the width of the protrusion, so that the flow channel between the plurality of heat dissipation fins located in the groove region can have a larger area to circulate the cooling liquid, thereby improving the heat dissipation effect of the flow channel between the plurality of heat dissipation fins on the power module. The width of the protrusion is less than the width of the groove along the width direction of the heat sink, and the width of the protrusion is greater than half the width of the groove, so that the part of the groove other than the part stacked with the protrusion has a relatively thin thickness, which is beneficial to the weight reduction of the heat sink.

[0023] In the embodiment of the present application, the width of the protrusion is less than the width of the power module fixed thereto, and the width of the protrusion is greater than half the width of the power module fixed thereto. The width of the power module refers to the width of the packaging part along the width direction of the heat sink. The width of the protrusion is less than the width of the power module fixed thereto, and the width of the protrusion is greater than half the width of the power module fixed thereto, so that the protrusion can stably fix the plurality of power modules, and the part of the side surface of the heat sink along the width direction other than the protrusion can have a larger spacing with the power module, which is beneficial to avoiding the electrical influence of the heat sink on the plurality of power modules, enabling the plurality of power modules to work normally, and improving the running safety performance of the liquid-cooled power module in the motor controller.

[0024] In the embodiment of the present application, the width of the protrusion is less than the width of the groove along the width direction of the heat sink, and the width of the protrusion is greater than half the width of the groove, and the width of the protrusion is less than the width of the power module fixed thereto, and the width of the protrusion is greater than half the width of the power module fixed thereto, which is beneficial to the cooling liquid circulating in the groove to absorb the heat generated by the plurality of power modules more quickly, and to cool and cool the plurality of power modules.

[0025] In the embodiment of the present application, the length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half the length of the groove, so that the length of the protrusion does not exceed the length of the groove, and the protrusion does not excessively occupy the space of the heat sink along the length direction, which is beneficial to the miniaturization of the heat sink. The width of the groove is greater than the width of the protrusion, so that the flow channel between the plurality of heat dissipation fins located in the groove region can have a larger area to circulate the cooling liquid, thereby improving the heat dissipation effect of the flow channel between the plurality of heat dissipation fins on the power module. The length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half the length of the groove, so that the part of the groove other than the part stacked with the protrusion has a relatively thin thickness, which is beneficial to the weight reduction of the heat sink.

[0026] In the embodiment of the present application, the length of the protrusion is less than the sum of the lengths of the plurality of power modules fixed thereto, and the length of the protrusion is greater than half the sum of the lengths of the plurality of power modules fixed thereto, so that when the protrusion stably fixes the plurality of power modules, the part of the one side surface of the length direction of the one heat sink except the protrusion can have a larger spacing with the power modules, which is conducive to avoiding the electrical influence of the one heat sink on the plurality of power modules, enabling the plurality of power modules to work normally, and improving the operation safety performance of the liquid-cooled power module in the motor controller.

[0027] In the embodiment of the present application, along the length direction of the one heat sink, the length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half the length of the groove. The length of the protrusion is less than the sum of the lengths of the plurality of power modules fixed thereto, and the length of the protrusion is greater than half the sum of the lengths of the plurality of power modules fixed thereto, which is conducive to the cooling liquid flowing between the plurality of heat dissipation teeth in the groove absorbing the heat generated by the plurality of power modules faster, and cooling and cooling the plurality of power modules.

[0028] In one embodiment, the plurality of power modules are arranged at intervals along the length direction of the one heat sink, and each power module includes two groups of transmission copper bars, the two groups of transmission copper bars are arranged opposite to each other along the width direction of the one heat sink, and the length of the one heat sink along the length direction is greater than the length of the one heat sink along the width direction. Among them, along the width direction of the one heat sink, the spacing of the two groups of transmission copper bars of the one power module is greater than the width of the one protrusion fixed thereto. Each group of transmission copper bars has a gap with the one side surface along the recess direction of the one groove, and at least part of the one side surface is exposed in the gap. The gap along the recess direction of the one groove is greater than or equal to the thickness of the one protrusion.

[0029] In the embodiment of the present application, along the width direction of the one heat sink, the spacing of the two groups of transmission copper bars of the one power module is greater than the width of the protrusion fixed thereto, so that along the width direction of the one heat sink, the two groups of transmission copper bars of the power module can have a larger spacing with the part of the one side surface except the protrusion, and the protrusion fixes the power module farther away from the one side surface, so that it is not necessary to paste an insulating film on the one side surface, which can reduce the cost and also ensure compliance with the safety requirements.

[0030] In the embodiment of the present application, each group of transmission copper bars has a gap with the one side surface along the recess direction of the one groove, and at least part of the one side surface is exposed in the gap, so that each group of transmission copper bars of the power module can avoid electrical interference with the one side surface through the gap, and also enables electrical safety to be achieved without pasting an insulating film on the one side surface, thereby reducing the production cost.

[0031] In the embodiment of the present application, the gap along the recess direction of the groove is greater than or equal to the thickness of the protrusion. The gap along the recess direction of the groove is large, so that one side surface and the transmission copper bar, the opposite part can be spaced apart from the transmission copper bar of the power module, and has a larger spacing, which is more conducive to realizing the electrical interference between one side surface and the transmission copper bar of the power module, ensuring the electrical safety distance between the power module and one side surface, and facilitating the smooth operation of the power module.

[0032] In one embodiment, the gap along the recess direction of one groove is greater than or equal to the depth of one groove, and the gap is less than the extension length of each of at least part of the heat dissipation teeth.

[0033] In the embodiment of the present application, the gap along the recess direction of the groove is greater than or equal to the depth of the groove, and the gap is less than the extension length of each of at least part of the heat dissipation teeth, wherein the at least part of the heat dissipation teeth refers to the heat dissipation teeth with an extension length greater than the depth of the groove, so that the size of the gap is small, and the overall thickness of the heat dissipation plate is not excessively increased while ensuring the safety distance of the gap to electrically isolate the heat dissipation plate from the plurality of power modules, which is conducive to the small space occupied by the liquid-cooled power module along the recess direction of the groove, and facilitates the miniaturization layout of the liquid-cooled power module in the motor controller.

[0034] In one embodiment, the heat dissipation plate further comprises a plurality of fixing protrusions for fixing another heat dissipation plate, and the length of the heat dissipation plate along its length direction is greater than the length of the heat dissipation plate along its width direction. Wherein, along the width direction of the heat dissipation plate, each fixing protrusion is away from a groove protrusion, and the plurality of fixing protrusions are distributed on both sides of the groove. Along the length direction of the heat dissipation plate, each fixing protrusion is spaced apart from the transmission copper bar of the power module adjacent to it. Along the recess direction of the groove, the thickness of each fixing protrusion is greater than the depth of the groove, and the thickness of each fixing protrusion is less than or equal to the extension length of each of at least part of the heat dissipation teeth.

[0035] In the embodiment of the present application, the heat dissipation plate further comprises a plurality of fixing protrusions for fixing another heat dissipation plate, and the other heat dissipation plate is used to form a liquid-cooled heat dissipation cavity together with the other side surface. The plurality of fixing protrusions are conducive to the formation of a more stable structure of the liquid-cooled heat dissipation cavity.

[0036] In the embodiment of the present application, the other side of one heat dissipation plate forms a groove, so that the structural strength of one heat dissipation plate is reduced. By arranging a plurality of fixing protrusions, and along the width direction of one heat dissipation plate, each fixing protrusion protrudes away from the groove, and the plurality of fixing protrusions are distributed on both sides of the groove, so that the overall strength of one heat dissipation plate is enhanced. Along the width direction of one heat dissipation plate, each fixing protrusion protrudes away from the groove, and the plurality of fixing protrusions are distributed on both sides of the groove, so that the plurality of fixing protrusions can also have sufficient spacing with the two groups of transmission copper bars of the plurality of power modules in the recess direction of the groove to ensure electrical safety.

[0037] In the embodiment of the present application, along the length direction of one heat dissipation plate, each fixing protrusion is spaced apart from the transmission copper bar of the adjacent power module, so that the fixing protrusion has a safe electrical distance from the power module, which is beneficial to ensure the normal operation of the liquid-cooled power module.

[0038] In the embodiment of the present application, along the recess direction of the groove, the thickness of each fixing protrusion is greater than the depth of the groove, and the thickness of each fixing protrusion is less than or equal to the extension length of each of at least part of the heat dissipation teeth, so that the fixing protrusion can strengthen the strength of the groove without being too thick, which is beneficial to the weight reduction of one heat dissipation plate, and also beneficial to the space occupied by one heat dissipation plate and the other heat dissipation plate in the recess direction of the groove when the other side of one heat dissipation plate forms a liquid-cooled heat dissipation cavity with the other side. In the embodiment of the present application, at least part of the heat dissipation teeth refers to the heat dissipation teeth with an extension length greater than the depth of the groove.

[0039] In one embodiment, one protrusion includes three sub-protrusions, the three sub-protrusions are arranged at intervals along the length direction of one heat dissipation plate, and each sub-protrusion is used to fix one power module. Among them, along the length direction of one heat dissipation plate, the length of one groove is greater than the sum of the lengths of the three sub-protrusions, the maximum distance between two heat dissipation teeth is greater than the sum of the lengths of the three sub-protrusions, and the distance between adjacent two sub-protrusions is less than the length of each sub-protrusion.

[0040] In the embodiment of the present application, the protrusion includes three sub-protrusions, the three sub-protrusions are arranged at intervals along the length direction of one heat dissipation plate, and each sub-protrusion is used to fix one power module, so that the groove has more parts with thinner thickness along the thickness direction of one heat dissipation plate, which is beneficial to the weight reduction of one heat dissipation plate, and also beneficial to the cooling liquid circulating in the groove to absorb the heat of the power module faster and improve the cooling efficiency.

[0041] In the embodiment of the present application, the length of the groove is greater than the sum of the lengths of the three sub-protrusions along the length direction of the heat dissipation plate, so that the length of the three sub-protrusions does not exceed the length of the groove, and the three sub-protrusions do not excessively occupy the space of the heat dissipation plate along the length direction, which is beneficial to the miniaturization of the heat dissipation plate. The length of the groove is greater than the sum of the lengths of the three sub-protrusions, and the maximum distance between the two heat dissipation teeth is greater than the sum of the lengths of the three sub-protrusions, so that the surfaces of the three power modules fixed with the three sub-protrusions can be flowed through by the flowing cooling liquid in the groove, which is beneficial to the cooling of the power modules by the cooling liquid and improves the cooling efficiency of the heat dissipation plate.

[0042] In the embodiment of the present application, the distance between the two adjacent sub-protrusions is less than the length of each sub-protrusion, so that each sub-protrusion has a large enough space to fix the power module, and more sub-protrusions can be arranged on one side surface. The distance between the two adjacent sub-protrusions is less than the length of each sub-protrusion, which also enables the three sub-protrusions not to excessively occupy the space of the heat dissipation plate along the length direction, which is beneficial to the miniaturization layout of the liquid-cooled power module.

[0043] In one embodiment, the distance between the circumferential wall of one groove and each heat dissipation tooth adjacent thereto is less than the distance between each two adjacent heat dissipation teeth.

[0044] Since the groove is formed in the embodiment of the present application to sink the plurality of heat dissipation teeth towards the plurality of power modules, the gap between the circumferential wall of the groove and the heat dissipation teeth can flow the cooling liquid. In the embodiment of the present application, the distance between the circumferential wall of the groove and the heat dissipation teeth is less than the distance between the two adjacent heat dissipation teeth, and the greater the distance, the smaller the resistance of the cooling liquid flow. When the cooling liquid flows into the liquid-cooled heat dissipation cavity of the heat dissipation plate, the cooling liquid can be prevented from bypassing the circumferential wall of the groove and flowing more between the heat dissipation teeth, the residence time of the cooling liquid in the heat dissipation plate is prolonged, the flow of the cooling liquid is stirred by the heat dissipation teeth, and the cooling liquid has a larger cooling area with the heat dissipation teeth, so that the cooling effect of the heat dissipation plate on the plurality of power modules is improved.

[0045] In one embodiment, the other side surface further comprises a sealing groove, the sealing groove surrounds the groove, and the sealing groove is used to accommodate a sealing ring, the sealing ring is used to seal the liquid-cooled heat dissipation cavity formed by the other side surface of the heat dissipation plate and the other heat dissipation plate, wherein, along the recess direction of the groove, the sealing groove is recessed towards the side surface, and the depth of the sealing groove is less than or equal to the groove depth of the groove.

[0046] In the embodiment of the present application, the other side further comprises a sealing groove, the sealing groove surrounds the groove, the circumferential side wall of the groove has a large thickness, the sealing groove is arranged on the circumferential side of the groove, the influence on the structural strength of a heat dissipation plate is small, and the sealing ring accommodated in the sealing groove can fully seal the groove in the circumferential direction, which is beneficial to improve the sealing effect and prevent the cooling liquid in the liquid cooling cavity from leaking to affect the electrical components in the motor controller.

[0047] In the embodiment of the present application, the sealing groove is recessed towards one side in the recessed direction of the groove, so that the sealing groove can accommodate the sealing ring and cooperate with the other heat dissipation plate to form the liquid cooling cavity. The depth of the sealing groove is less than or equal to the groove depth, so that the groove depth of the sealing groove will not affect the overall structural strength of the heat dissipation plate, which is beneficial to ensure the structural stability of the heat dissipation plate.

[0048] In the embodiment of the present application, the other side further comprises a sealing groove, the sealing groove surrounds the groove, the circumferential side wall of the groove has a large thickness, the sealing groove is arranged on the circumferential side of the groove, the influence on the structural strength of a heat dissipation plate is small, and the sealing ring accommodated in the sealing groove can fully seal the groove in the circumferential direction, which is beneficial to improve the sealing effect and prevent the cooling liquid in the liquid cooling cavity from leaking to affect the electrical components in the motor controller.

[0049] In the embodiment of the present application, the other side further comprises a sealing groove, the sealing groove surrounds the groove, the circumferential side wall of the groove has a large thickness, the sealing groove is arranged on the circumferential side of the groove, the influence on the structural strength of a heat dissipation plate is small, and the sealing ring accommodated in the sealing groove can fully seal the groove in the circumferential direction, which is beneficial to improve the sealing effect and prevent the cooling liquid in the liquid cooling cavity from leaking to affect the electrical components in the motor controller.

[0050] In the embodiment of the present application, the other side further comprises a sealing groove, the sealing groove surrounds the groove, the circumferential side wall of the groove has a large thickness, the sealing groove is arranged on the circumferential side of the groove, the influence on the structural strength of a heat dissipation plate is small, and the sealing ring accommodated in the sealing groove can fully seal the groove in the circumferential direction, which is beneficial to improve the sealing effect and prevent the cooling liquid in the liquid cooling cavity from leaking to affect the electrical components in the motor controller.

[0051] In the embodiment of the present application, the other side further comprises a sealing groove, the sealing groove surrounds the groove, the circumferential side wall of the groove has a large thickness, the sealing groove is arranged on the circumferential side of the groove, the influence on the structural strength of a heat dissipation plate is small, and the sealing ring accommodated in the sealing groove can fully seal the groove in the circumferential direction, which is beneficial to improve the sealing effect and prevent the cooling liquid in the liquid cooling cavity from leaking to affect the electrical components in the motor controller.

[0052] In a fourth aspect, an electric vehicle includes a vehicle frame, a power battery, and a power assembly as in the third aspect, the vehicle frame is configured to secure the power battery and the power assembly, and the motor of the power assembly is configured to receive power from the power battery through the motor controller to drive the wheels.

[0053] The power assembly in the embodiments of the present application includes the motor controller, the liquid-cooled power module of the motor controller is formed by using another side to form a downwardly recessed groove and a plurality of downwardly sunken heat dissipation teeth, so that the heat dissipation teeth can have a larger contact area with the cooling liquid flowing through the groove, the cooling efficiency of a heat dissipation plate to a plurality of power modules is improved, the plurality of heat dissipation teeth extend from the groove bottom to reduce the thickness of the heat dissipation plate, the integration of a heat dissipation plate is improved, and the integration of the liquid-cooled power module is improved, which is beneficial to the small overall volume of the liquid-cooled power module, the miniaturization of the motor controller, and the miniaturization of the power assembly, thereby optimizing the overall vehicle layout. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0055] FIG. 1 is a structural schematic diagram of an electric vehicle provided by the embodiments of the present application;

[0056] FIG. 2 is a structural schematic diagram of a power assembly provided by the embodiments of the present application;

[0057] FIG. 3 is a structural schematic diagram of a liquid-cooled power module provided by the embodiments of the present application;

[0058] FIG. 4 is an exploded view of the liquid-cooled power module provided by the embodiments of the present application;

[0059] FIG. 5 is another structural schematic diagram of the liquid-cooled power module provided by the embodiments of the present application;

[0060] FIG. 6 is a cross-sectional view of a heat dissipation plate provided by the embodiments of the present application;

[0061] FIG. 7 is a cross-sectional view of the liquid-cooled power module provided by the embodiments of the present application;

[0062] FIG. 8 is a partial enlarged view of M1 part of the liquid-cooled power module in FIG. 7;

[0063] FIG. 9 is a structural schematic diagram of a heat dissipation plate provided by the embodiments of the present application;

[0064] FIG. 10 is another cross-sectional view of the liquid-cooled power module provided by the embodiments of the present application;

[0065] FIG. 11 is a structural schematic diagram of a power module provided by the embodiments of the present application;

[0066] Fig. 12 is an exploded view of the liquid-cooled power module according to another embodiment of the present application;

[0067] Fig. 13 is a structural schematic view of the heat sink according to another embodiment of the present application;

[0068] Fig. 14 is another structural schematic view of the heat sink according to another embodiment of the present application;

[0069] Fig. 15 is a partial enlarged view of the M2 portion of the heat sink in Fig. 9;

[0070] Fig. 16 is another sectional view of the liquid-cooled power module according to an embodiment of the present application. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0072] To improve the cooling efficiency of the liquid-cooled power module and reduce the volume of the liquid-cooled power module, and improve the integration of the motor controller. The present application provides a liquid-cooled power module for a motor controller, the motor controller is used to control the motor of an electric vehicle to drive the wheels of the electric vehicle, the liquid-cooled power module includes an inverter module and a heat sink. An inverter module includes a three-phase bridge arm, the three-phase bridge arm is used to receive power supply from a power battery of an electric vehicle and output three-phase current to drive the motor of the electric vehicle, the three-phase bridge arm includes a plurality of power modules. A heat sink includes two sides, the two sides are opposite to each other along the thickness direction of the heat sink, one side is used to fix the plurality of power modules of the three-phase bridge arm, the other side is used to enclose another heat sink to form a liquid-cooled heat dissipation cavity, the other side includes a groove and a plurality of heat dissipation teeth, the recess direction of the groove is towards the plurality of power modules of the three-phase bridge arm along the thickness direction of the heat sink, each heat dissipation tooth extends from the groove bottom along the stacking direction of each power module and the heat sink, and the extension length of each of at least part of the heat dissipation teeth is greater than the depth of the groove. The present application forms a downward recessed groove and a plurality of downward sunken heat dissipation teeth by using the other side, so that the heat dissipation teeth can have a larger contact area with the cooling liquid flowing through the groove, improving the cooling efficiency of the plurality of power modules by one heat sink, the plurality of heat dissipation teeth extend from the groove bottom to reduce the thickness of the heat sink, improving the integration of one heat sink, and further improving the integration of the liquid-cooled power module, which is beneficial to the overall small volume of the liquid-cooled power module, and is beneficial to the miniaturization of the motor controller, and optimizes the overall vehicle layout.

[0073] The liquid-cooled power module provided by the embodiments of the present application is used for a motor controller, the motor controller is applied to a powertrain, the powertrain is applied to an electric vehicle, and the overall performance of the electric vehicle is improved.

[0074] FIG. 1 is a structural schematic diagram of an electric vehicle 1 according to an embodiment of the present application, and FIG. 2 is a structural schematic diagram of a power assembly 10 according to an embodiment of the present application. FIG. 3 is a structural schematic diagram of a liquid-cooled power module 100 according to an embodiment of the present application.

[0075] In an embodiment, the electric vehicle 1 comprises a vehicle frame 20, a power battery 30 and the power assembly 10, as shown in FIG. 1, the vehicle frame 20 is used to fix the power battery 30 and the power assembly 10. In the embodiment of the present application, the power assembly 10 is used to receive power supply from the power battery 30 and drive the wheels 40.

[0076] In the embodiment of the present application, the power battery 30 can also be referred to as a battery pack or a battery.

[0077] In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device.

[0078] In an embodiment, the power assembly 10 comprises a motor 11, a reducer 12 and a motor controller 13. As shown in FIG. 2, in the embodiment of the present application, the motor 11 comprises a motor shaft (not shown), a motor stator (not shown) and a motor rotor (not shown), the reducer 12 comprises a gear assembly (not shown), an input shaft (not shown) and an output shaft (not shown), the motor shaft of the motor 11 is used to be in driving connection with the input shaft of the reducer 12, the input shaft receives power transmitted by the motor shaft of the motor 11 and transmits the power to the output shaft through the gear assembly. The gear assembly can be set as required, which can be a single-gear reducer, a two-gear or multi-gear reducer. The motor rotor is fixedly sleeved on the motor shaft, and the motor stator drives the motor rotor to rotate after receiving alternating current, thereby driving the motor shaft to rotate.

[0079] In the embodiment of the present application, the motor controller 13 is used to control the motor 11 of the electric vehicle 1 to drive the wheels 40 of the electric vehicle 1. The motor controller 13 is used to receive direct current transmitted by the power battery 30 and convert the direct current into alternating current to transmit to the motor 11, the power battery 30 is connected to the winding of the motor 11 through the motor 11 control circuit to drive the motor 11, and the motor shaft of the motor 11 is in driving connection with the input shaft of the reducer 12.

[0080] In an embodiment, the motor controller 13 is also used to charge and discharge the battery. The motor controller 13 is also used to integrate at least one of an on-board charger, a vehicle controller and a power distribution device.

[0081] In an embodiment, as shown in FIG. 2 and FIG. 3, the motor controller 13 comprises a housing (not shown) for accommodating the liquid-cooled power module 100, and the motor 11 is configured to receive power supply from the liquid-cooled power module 100 of the motor controller 13. The liquid-cooled power module 100 comprises a heat sink and a power module, the heat sink is configured to cool the power module, and the power module is configured to realize conversion between alternating current and direct current.

[0082] In an embodiment, the motor controller 12 further comprises a DC filter, a bus capacitor, a Hall copper bar assembly, a circuit board, and the like.

[0083] The motor controller of the electric vehicle needs to arrange a large number of electronic and electrical components, such as a DC filter, a bus capacitor, a power module, a heat sink, and the like. Each component is fixed on the housing of the motor controller by screws one by one. The large number of components makes the motor controller 13 bulky, and the large number of components also makes the assembly complex, difficult to rework and maintain, and low in integration.

[0084] In the embodiment of the present application, the recessed groove and the plurality of downwardly sunken heat dissipation teeth formed on the other side enable the heat dissipation teeth to have a larger contact area with the cooling liquid flowing through the groove, improve the cooling efficiency of the plurality of power modules by one heat sink, and the plurality of heat dissipation teeth extend from the groove bottom to reduce the thickness of the heat sink, which also improves the integration of one heat sink, thereby facilitating the miniaturization of the liquid-cooled power module and reducing the assembly difficulty.

[0085] The liquid-cooled power module 100 for the motor controller 13 provided in the embodiments of the present application will be described in detail below.

[0086] FIG. 4 is an exploded view of the liquid-cooled power module 100 provided in the embodiments of the present application, FIG. 5 is another structural schematic view of the liquid-cooled power module 100 provided in the embodiments of the present application, FIG. 6 is a sectional view of the heat sink 110 provided in the embodiments of the present application, FIG. 7 is a sectional view of the liquid-cooled power module 100 provided in the embodiments of the present application, and FIG. 8 is a partial enlarged view of M1 part of the liquid-cooled power module 100 in FIG. 7.

[0087] In an embodiment, as shown in FIG. 1 to FIG. 3, the liquid-cooled power module 100 comprises an inverter module (not shown) and a heat sink 110. The inverter module comprises three-phase bridge arms (not shown), the three-phase bridge arms are configured to receive power supply from the power battery 30 of the electric vehicle 1 and output three-phase current to drive the motor 11 of the electric vehicle 1, the three-phase bridge arms comprise a plurality of power modules 210, and the heat sink 110 is configured to circulate cooling liquid to cool the plurality of power modules 210 of the three-phase bridge arms.

[0088] In an embodiment, the heat sink 110 includes two sides 110a, 110b, as shown in FIGS. 3-5, the two sides 110a, 110b are opposite to each other along the thickness direction Z of the heat sink 110, one side 110a is used to fix the plurality of power modules 210 of the three-phase bridge arm, and the other side 110b is used to enclose the other heat sink 310 to form a liquid cooling heat dissipation cavity 101, the side 110b includes a groove 112 and a plurality of heat dissipation teeth 113, the recess direction Z of the groove 112 is along the thickness direction Z of the heat sink 110 towards the plurality of power modules 210 of the three-phase bridge arm, as shown in FIGS. 6 and 7, each heat dissipation tooth 113 extends from the groove bottom of the groove 112 along the stacking direction Z of each power module 210 and the heat sink 110, and the extension length of each of at least part of the heat dissipation teeth 113 is greater than the depth of the groove 112.

[0089] In the embodiments of the present application, the recess direction of the groove 112 is denoted as Z, the width direction of the heat sink 110 is denoted as Y, and the length direction of the heat sink 110 is denoted as X, the directions X, Y, and Z are perpendicular to each other. The recess direction Z of the groove 112 is the same as the thickness direction Z of the heat sink 110 and the stacking direction Z of the power module 210 and the heat sink 110.

[0090] In the embodiments of the present application, the heat sink 110 includes two sides 110a, 110b, the two sides 110a, 110b are opposite to each other along the thickness direction Z of the heat sink 110, so that the side 110a of the heat sink 110 can be used to fix the plurality of power modules 210 of the three-phase bridge arm, and the side 110b can be used to form the groove 112 and the plurality of heat dissipation teeth 113, and the two sides 110a, 110b do not interfere with each other. In an embodiment, the side 110a and the plurality of power modules 210 of the three-phase bridge arm are fixed by welding, which is beneficial to improve the structural strength and heat conduction efficiency of the liquid cooling power module 100.

[0091] In the embodiments of the present application, the side 110a is used to fix the plurality of power modules 210 of the three-phase bridge arm, so that the heat sink 110 and the plurality of power modules 210 have a larger contact area, which is beneficial to the cooling liquid in the liquid cooling heat dissipation cavity 101 to dissipate heat of the plurality of power modules 210, and ensures the normal operation of the motor controller 13.

[0092] In the embodiment of the present application, the side surface 110b is used to enclose the heat dissipation plate 310 to form a liquid cooling heat dissipation cavity 101, the side surface 110b comprises a groove 112 and a plurality of heat dissipation teeth 113, the groove 112 formed by the heat dissipation plate 110 with the heat dissipation teeth 113 can supply the cooling liquid to flow through, so that the contact area between the cooling liquid and the plurality of heat dissipation teeth 113 is larger, so that the area of the heat dissipation plate 110 in contact with the cooling liquid is larger, so that the heat dissipation plate 110 has a larger heat dissipation space, which is beneficial to improve the cooling effect of the heat dissipation plate 110 on the plurality of power modules 210. The side surface 110b comprises the groove 112 and the plurality of heat dissipation teeth 113, compared with directly arranging the heat dissipation teeth 113 on the side surface 110b of the heat dissipation plate 110, the plurality of heat dissipation teeth 113 of the heat dissipation plate 110 are arranged in a way of sinking along the recess direction Z of the groove 112, which can reduce the thickness of the heat dissipation plate 110, reduce the weight of the heat dissipation plate 110, and also save the space of the heat dissipation plate 110 along the thickness direction Z thereof. The groove 112 formed by the heat dissipation plate 110 with the heat dissipation teeth 113 can supply the cooling liquid to flow through, and also make the integration of the heat dissipation plate 110 with the plurality of power modules 210 of the three-phase bridge arm higher, which is beneficial to the miniaturization of the liquid cooling power module 100, and further beneficial to the miniaturization layout of the motor controller 13.

[0093] In the embodiment of the present application, the recess direction Z of the groove 112 is along the thickness direction Z of the heat dissipation plate 110 towards the plurality of power modules 210 of the three-phase bridge arm, so that the groove bottom of the groove 112 is thinner, even if the plurality of heat dissipation teeth 113 extend from the groove bottom of the groove 112 along the stacking direction Z of each power module 210 and the heat dissipation plate 110, the thickness of the heat dissipation plate 110 can be thinner, which is beneficial to weight reduction and saving space of the heat dissipation plate 110 along the thickness direction Z thereof. The recess direction Z of the groove 112 is along the thickness direction Z of the heat dissipation plate 110 towards the plurality of power modules 210 of the three-phase bridge arm, which can also make the cooling liquid flowing in the groove 112 take away the heat of the plurality of power modules 210 faster through the heat dissipation plate 110 with thinner thickness, and improve the heat dissipation efficiency.

[0094] In the embodiment of the present application, each heat dissipation tooth 113 extends from the groove bottom of the groove 112 along the stacking direction Z of each power module 210 and the heat dissipation plate 110, which can make the heat dissipation tooth 113 have more contact area with the cooling liquid flowing in the liquid cooling heat dissipation cavity 101, increase the heat dissipation area of the heat dissipation plate 110, which is beneficial to improve the heat dissipation efficiency of the heat dissipation plate 110 on the power module 210, and guarantee the operation safety of the liquid cooling power module 100 in the motor controller 13.

[0095] In the embodiments of the present application, as shown in FIG. 7 and FIG. 8, the extension length of each of the at least partial heat dissipation teeth 113 is denoted as L1, and the depth of the groove 112 is denoted as L2, L1>L2, the at least partial heat dissipation teeth 113 refer to the heat dissipation teeth 113 whose extension length is greater than the depth of the groove 112, and the extension length of each of the at least partial heat dissipation teeth 113 is relatively long, so that the heat dissipation teeth 113 can make full use of the space in the depth direction of the groove 112, contact the cooling liquid as much as possible, form a larger heat dissipation area, and improve the cooling effect of the heat dissipation plate 110 on the plurality of power modules 210. If L1L2, the cooling liquid flows in the groove 112, and there is a gap between the tooth surface of the plurality of heat dissipation teeth 113 and the heat dissipation plate 310, so that the cooling liquid flows in the gap between the tooth surface and the heat dissipation plate 310, thereby reducing the stirring and turbulence effect of the heat dissipation teeth 113 on the cooling liquid, and the cooling effect is poor. Only the at least partial heat dissipation teeth 113 require L1>L2, which can reduce the processing difficulty of the side surface 110b.

[0096] In an embodiment, the number of the at least partial heat dissipation teeth 113 accounts for more than 85% of the total number of the heat dissipation teeth 113.

[0097] In an embodiment, without considering the processing process error, the extension length of each of the heat dissipation teeth 113 is greater than the depth of the groove 112.

[0098] In an embodiment, the side surface 110a includes a protrusion 111, as shown in FIG. 3, FIG. 4 and FIG. 7, the protrusion 111 protrudes away from the side surface 110b in the recess direction Z of the groove 112, the protrusion 111 is used for fixing the plurality of power modules 210, and the protrusion 111 is stacked on the plurality of heat dissipation teeth 113 in the recess direction Z of the groove 112.

[0099] In the embodiments of the present application, the side surface 110a includes a protrusion 111, the protrusion 111 protrudes away from the side surface 110b in the recess direction Z of the groove 112, the protrusion 111 is used for fixing the plurality of power modules 210, so that the plurality of power modules 210 are spaced apart from the surface of the side surface 110a except the protrusion 111, avoiding the electrical influence of the heat dissipation plate 110 on the plurality of power modules 210, enabling the plurality of power modules 210 to work normally, and improving the running safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0100] In the embodiments of the present application, the protrusions 111 are stacked in the recess direction Z of the grooves 112 and the plurality of heat dissipation fins 113, so that although the protrusions 111 increase the thickness of the heat dissipation plate 110, the heat dissipation fins 113 on the side surface 110b are recessed from the side surface 110b, so that the thickness of the area where the heat dissipation fins 113 are located and the bottom of the groove 112 is small, so that the overall thickness of the heat dissipation plate 110 does not increase, thereby reducing the electrical influence of the plurality of power modules 210 on the heat dissipation plate 110, and at the same time, the heat dissipation plate 110 has a small thickness in the thickness direction Z. The protrusions 111 are stacked in the recess direction Z of the grooves 112 and the plurality of heat dissipation fins 113, which is also beneficial to shorten the distance between the flow channels of the plurality of heat dissipation fins 113 and the power modules 210 fixed by the protrusions 111 in the recess direction Z of the grooves 112, so that the cooling liquid flowing between the plurality of heat dissipation fins 113 can better dissipate heat from the plurality of power modules 210 fixed by the protrusions 111, thereby improving the heat dissipation efficiency.

[0101] In an embodiment, in the recess direction Z of the grooves 112, as shown in FIGS. 7 and 8, the thickness of the protrusions 111 is less than or equal to the depth of the grooves 112.

[0102] In the embodiments of the present application, as shown in FIG. 8, in the recess direction Z of the grooves 112, the thickness of the protrusions 111 is L3, and the depth of the grooves 112 is L2, L3≤L2, so that the overall thickness of the heat dissipation plate 110 is small, which is beneficial to reduce the weight of the heat dissipation plate 110, and also beneficial to make the overall volume of the liquid-cooled power module 100 small, thereby facilitating the miniaturization of the liquid-cooled power module 100 in the motor controller 13.

[0103] In an embodiment, in the recess direction Z of the grooves 112, as shown in FIGS. 7 and 8, the thickness of the protrusions 111 is less than the extension length of each of at least part of the heat dissipation fins 113.

[0104] In the embodiments of the present application, as shown in FIG. 8, in the recess direction Z of the grooves 112, the thickness of the protrusions 111 is L3, and the extension length of each of at least part of the heat dissipation fins 113 is L1, L3<L1, L1 is large, so that the contact area of the cooling liquid with the heat dissipation fins 113 is large, so that the cooling efficiency of the cooling liquid on the heat dissipation fins 113 is improved, thereby reducing the overall thickness of the heat dissipation plate 110 while improving the heat dissipation effect of the heat dissipation fins 113 on the power modules 210. In the embodiments of the present application, at least part of the heat dissipation fins 113 refers to the heat dissipation fins 113 whose extension length is greater than the depth of the grooves 112.

[0105] In an embodiment, without considering the processing process error, the thickness of the protrusions 111 is less than the extension length of each of all the heat dissipation fins 113.

[0106] In an embodiment, the thickness of the protrusion 111 is greater than or equal to 1 mm along the recessing direction Z of the groove 112, as shown in FIG. 7 and FIG. 8.

[0107] In an embodiment of the present application, the thickness of the protrusion 111 is L3 along the recessing direction Z of the groove 112, L3≥1 mm, so that the part of the side surface 110a other than the protrusion 111 has a large enough spacing with the plurality of power modules 210 fixed by the protrusion 111, avoiding the electrical influence of the heat sink 110 on the plurality of power modules 210, enabling the plurality of power modules 210 to work normally, and improving the safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0108] For example, as shown in FIG. 8, the thickness of the protrusion 111 is L3 along the recessing direction Z of the groove 112, L3=1 mm.

[0109] For example, as shown in FIG. 8, the thickness of the protrusion 111 is L3 along the recessing direction Z of the groove 112, L3=1.2 mm.

[0110] For example, as shown in FIG. 8, the thickness of the protrusion 111 is L3 along the recessing direction Z of the groove 112, L3=1.5 mm.

[0111] FIG. 9 is a structural schematic diagram of the heat sink 110 provided in an embodiment of the present application.

[0112] In an embodiment, as shown in FIG. 9, the length of the heat sink 110 along its width direction Y is less than the length of the heat sink 110 along its length direction X. As shown in FIG. 7, the width of the protrusion 111 is less than the width of the groove 112 along the width direction Y of the heat sink 110, and the width of the protrusion 111 is greater than half of the width of the groove 112. The width of the protrusion 111 is less than the width of one power module 210 fixed thereto, and the width of the protrusion 111 is greater than half of the width of one power module 210 fixed thereto.

[0113] In an embodiment of the present application, as shown in FIG. 9, the length of the heat sink 110 along its width direction Y is L4, and the length of the heat sink 110 along its length direction X is L5, L4

[0114] In the embodiment of the present application, as shown in FIG. 7, along the width direction Y of the heat dissipation plate 110, the width of the protrusion 111 is L6, and the width of the groove 112 is L7, and 0.5L7L6L7, so that the width of the protrusion 111 does not exceed the width of the groove 112, the protrusion 111 does not excessively occupy the space of the heat dissipation plate 110 along the width direction Y, which is beneficial to the miniaturization of the heat dissipation plate 110, and the width of the groove 112 is greater than the width of the protrusion 111, so that the flow channel between the plurality of heat dissipation fins 113 located in the groove 112 area can have a larger area to flow the cooling liquid, and the heat dissipation effect of the flow channel between the plurality of heat dissipation fins 113 on the power module 210 is improved. 0.5L7L6L7, so that the part of the groove 112 other than the part stacked with the protrusion 111 has a thinner thickness, which is beneficial to the weight reduction of the heat dissipation plate 110.

[0115] In the embodiment of the present application, as shown in FIG. 7, along the width direction Y of the heat dissipation plate 110, the width of the protrusion 111 is L6, and the width of the power module 210 is L8, wherein the power module 210 includes a packaging part (not shown) and a transmission copper bar 211, 212 part exposed outside the packaging part, wherein the packaging part has a plurality of switching tubes inside, and the plurality of switching tubes are used to realize the conversion between direct current and alternating current, and the transmission copper bar 211, 212 part exposed outside the packaging part is used to receive or transmit external current. L8 refers to the width of the packaging part along the width direction Y of the heat dissipation plate 110. 0.5L8L6L8, so that the protrusion 111 can stably fix the plurality of power modules 210, and the part of the side surface 110a of the heat dissipation plate 110 along the width direction Y of the heat dissipation plate 110 other than the protrusion 111 can have a larger interval with the power module 210, which is beneficial to avoiding the electrical influence of the heat dissipation plate 110 on the plurality of power modules 210, enabling the plurality of power modules 210 to work normally, and improving the running safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0116] In the embodiment of the present application, 0.5L7L6L7, 0.5L8L6L8, which is beneficial to the cooling liquid flowing in the groove 112 to absorb the heat generated by the plurality of power modules 210 faster, and to cool and cool the plurality of power modules 210.

[0117] FIG. 10 is another cross-sectional view of the liquid-cooled power module 100 provided by the embodiment of the present application.

[0118] In one embodiment, as shown in FIG. 10, along the length direction X of the heat dissipation plate 110, the length of the protrusion 111 is less than the length of the groove 112, and the length of the protrusion 111 is greater than half the length of the groove 112. The length of the protrusion 111 is less than the sum of the lengths of the plurality of power modules 210 fixed thereto, and the length of the protrusion 111 is greater than half the sum of the lengths of the plurality of power modules 210 fixed thereto.

[0119] In the embodiment of the present application, along the length direction X of the heat dissipation plate 110, the length of the protrusion 111 is L9, and the length of the groove 112 is L10, 0.5L10

[0120] In the embodiment of the present application, along the length direction X of the heat dissipation plate 110, the length of the protrusion 111 is L9, the length of one power module 210 is L11, the sum of the lengths of the plurality of power modules 210 is L12, L12=3L11, 0.5L12

[0121] In the embodiment of the present application, 0.5L10

[0122] FIG. 11 is a structural schematic diagram of the power module 210 provided by the embodiment of the present application.

[0123] In an embodiment, as shown in FIG. 5 and FIG. 11, the plurality of power modules 210 are arranged along the length direction X of the heat sink 110, each power module 210 includes two groups of transmission copper bars 211, 212, and the two groups of transmission copper bars 211, 212 are arranged oppositely along the width direction Y of the heat sink 110. As shown in FIG. 7, along the width direction Y of the heat sink 110, the interval of the two groups of transmission copper bars 211, 212 of one power module 210 is greater than the width of the protrusion 111 fixed with the power module 210. Each group of transmission copper bars has a gap 115 with the side surface 110a along the recess direction Z of the groove 112, and at least part of the side surface 110a is exposed in the gap 115. As shown in FIG. 7 and FIG. 8, the gap 115 along the recess direction Z of the groove 112 is greater than or equal to the thickness of the protrusion 111.

[0124] In the embodiment, the plurality of power modules 210 are arranged along the length direction X of the heat sink 110, so that the plurality of power modules 210 can work relatively independently and do not interfere with each other. As shown in FIG. 2 and FIG. 11, each power module 210 includes two groups of transmission copper bars 211, 212, the transmission copper bar 211 of the power module 210 receives the direct current supplied by the power battery 30, converts the direct current into alternating current, and outputs the alternating current to the motor 11 through the transmission copper bar 212, and the two groups of transmission copper bars 211, 212 are arranged oppositely along the width direction Y of the heat sink 110, which is beneficial to the arrangement of the circuit in the motor controller 13 and the smooth driving of the motor 11 by the power battery 30.

[0125] In the embodiment, as shown in FIG. 7 and FIG. 8, along the width direction Y of the heat sink 110, the interval of the two groups of transmission copper bars 211, 212 of one power module 210 is L13, which refers to the interval between the copper bar parts of the two groups of transmission copper bars 211, 212 exposed to the encapsulation part of the power module 210, and the exposed transmission copper bars 211, 212 need to consider electrical safety. The width of the protrusion 111 is L6, and L13>L6, so that along the width direction Y of the heat sink 110, the two groups of transmission copper bars 211, 212 of the power module 210 can have a larger interval with the part of the side surface 110a except the protrusion 111, and the protrusion 111 fixes the power module 210 farther away from the side surface 110a, so that it is not necessary to paste an insulating film on the side surface 110a, the cost can be reduced, and the safety requirements can be met.

[0126] In the embodiment, each group of transmission copper bars has a gap 115 with the side surface 110a along the recess direction Z of the groove 112, and at least part of the side surface 110a is exposed in the gap 115, so that each group of transmission copper bars of the power module 210 can avoid electrical interference with the side surface 110a through the gap 115, and electrical safety can be achieved without pasting an insulating film on the side surface 110a, thereby reducing the production cost.

[0127] In the embodiment of the present application, as shown in FIG. 7 and FIG. 8, the width of the gap 115 along the recess direction Z of the groove 112 is denoted as L14, the thickness of the protrusion 111 is L3, L14≥L3, L14 is larger, so that the part of the side surface 110a opposite to the transmission copper bars 211, 212 of the power module 210 can have a larger spacing with the transmission copper bars 211, 212 of the power module 210, which is more conducive to realizing the electrical interference between the side surface 110a and the transmission copper bars 211, 212 of the power module 210, ensuring the electrical safety distance of the power module 210 and the side surface 110a, and being conducive to the smooth operation of the power module 210. In an embodiment, the heat sink plate 110 is generally a metal plate, and the metal heat sink plate 110 has better heat dissipation efficiency, but the metal heat sink plate 110 will affect the stability of the electrical transmission of the transmission copper bars 211, 212 of the power module 210. In the embodiment of the present application, the transmission copper bars 211, 212 of the power module 210 are moved away from the side surface 110a of the heat sink plate 110 by the protrusion 111, so as to ensure the stability of the electrical transmission of the transmission copper bars 211, 212 of the power module 210. The multiple heat dissipation teeth 113 are sunken towards the protrusion 111 to compensate for the increased thickness of the protrusion 111, so as to ensure the electrical safety without increasing the overall thickness of the liquid-cooled power module 100. In addition, the recessed groove 112 and the sunken multiple heat dissipation teeth 113 can increase the contact area with the cooling liquid, improve the heat dissipation effect of the liquid-cooled power module 100, and further improve the power of the liquid-cooled power module 100.

[0128] In an embodiment, as shown in FIG. 7 and FIG. 8, along the recess direction Z of the groove 112, the gap 115 is greater than or equal to the depth of the groove 112, and the gap 115 is less than the extension length of each of at least part of the heat dissipation teeth 113.

[0129] In the embodiment of the present application, along the recess direction Z of the groove 112, the width of the gap 115 is L14, the depth of the groove 112 is L2, and the extension length of each of at least part of the heat dissipation teeth 113 is L1, L14≥L2, L14

[0130] In an embodiment, the heat sink 110 further comprises a plurality of fixing protrusions 120, as shown in FIGS. 3-5, for fixing the heat sink 310. Wherein, along the width direction Y of the heat sink 110, each fixing protrusion 120 protrudes away from the groove 112, and the plurality of fixing protrusions 120 are distributed on both sides of the groove 112. Along the length direction X of the heat sink 110, each fixing protrusion 120 is spaced apart from the transmission copper bars 211, 212 of one power module 210 adjacent thereto. As shown in FIGS. 7 and 8, along the recess direction Z of the groove 112, the thickness of each fixing protrusion 120 is greater than the depth of the groove 112, and the thickness of each fixing protrusion 120 is less than or equal to the extension length of each of at least part of the heat sink teeth 113.

[0131] In the embodiments of the present application, the heat sink 110 further comprises a plurality of fixing protrusions 120, the plurality of fixing protrusions 120 are used for fixing the heat sink 310, and the heat sink 310 is used to form the liquid cooling heat dissipation cavity 101 together with the side surface 110b. The plurality of fixing protrusions 120 facilitate the formation of the liquid cooling heat dissipation cavity 101 to be more stable in structure.

[0132] In the embodiments of the present application, since the side surface 110b of the heat sink 110 forms the groove 112, the structural strength of the heat sink 110 is reduced. By arranging the plurality of fixing protrusions 120, and along the width direction Y of the heat sink 110, each fixing protrusion 120 protrudes away from the groove 112, and the plurality of fixing protrusions 120 are distributed on both sides of the groove 112, the overall strength of the heat sink 110 is enhanced. Along the width direction Y of the heat sink 110, each fixing protrusion 120 protrudes away from the groove 112, and the plurality of fixing protrusions 120 are distributed on both sides of the groove 112, which also enables the plurality of fixing protrusions 120 to have a large enough spacing with the two groups of transmission copper bars 211, 212 of the plurality of power modules 210 along the recess direction Z of the groove 112 to ensure electrical safety.

[0133] In the embodiments of the present application, along the length direction X of the heat sink 110, each fixing protrusion 120 is spaced apart from the transmission copper bars of one power module 210 adjacent thereto, so that the fixing protrusion 120 has a safe electrical distance with the power module 210, which is conducive to ensuring the normal operation of the liquid cooling power module 100.

[0134] In the embodiment of the present application, as shown in FIG. 8, along the recess direction Z of the groove 112, the thickness of each fixed protrusion 120 is denoted as L15, the depth of the groove 112 is L2, and the extension length of each of the at least partially heat dissipation teeth 113 is L1, L15>L2, and L15≤L1, so that the fixed protrusion 120 can strengthen the strength of the groove 112 while the thickness of the fixed protrusion 120 is not too thick, which is beneficial to the weight reduction of the heat dissipation plate 110, and is also beneficial to the liquid cooling heat dissipation cavity 101 formed by the heat dissipation plate 310 and the side surface 110b, so that the heat dissipation plate 110 and the heat dissipation plate 310 occupy less space in the recess direction Z of the groove 112. In the embodiment of the present application, the at least partially heat dissipation teeth 113 refer to the heat dissipation teeth 113 with an extension length greater than the depth of the groove 112.

[0135] FIG. 12 is an exploded view of the liquid-cooled power module 100 provided by another embodiment of the present application, and FIG. 13 is a structural schematic view of the heat dissipation plate 110 provided by another embodiment of the present application.

[0136] In an embodiment, the protrusion 111 includes three sub-protrusions 1110, which are arranged at intervals along the length direction X of the heat dissipation plate 110, and each sub-protrusion 1110 is used to fix a power module 210. As shown in FIGS. 10 and 13, along the length direction X of the heat dissipation plate 110, the length of the groove 112 is greater than the sum of the lengths of the three sub-protrusions 1110, as shown in FIGS. 9 and 13, the maximum distance between the two heat dissipation teeth 113 is greater than the sum of the lengths of the three sub-protrusions 1110, and as shown in FIG. 13, the distance between the adjacent two sub-protrusions 1110 is less than the length of each sub-protrusion 1110.

[0137] In the embodiment of the present application, the protrusion 111 includes three sub-protrusions 1110, which are arranged at intervals along the length direction X of the heat dissipation plate 110, and each sub-protrusion 1110 is used to fix a power module 210, so that more parts of the groove 112 have a thinner thickness along the thickness direction Z of the heat dissipation plate 110, which is beneficial to the weight reduction of the heat dissipation plate 110, and is also beneficial to the cooling liquid flowing in the groove 112 to absorb the heat of the power module 210 faster, thereby improving the cooling efficiency.

[0138] In the embodiment of the present application, as shown in FIG. 10 and FIG. 13, along the length direction X of the heat dissipation plate 110, the length of the groove 112 is L10, the length of one sub-protrusion 1110 is L16, the sum of the lengths of the three sub-protrusions 1110 is L17, L17=3L16, as shown in FIG. 9, the maximum spacing of two heat dissipation teeth 113 is L18, L10>L17, so that the length of the three sub-protrusions 1110 does not exceed the length of the groove 112, and the three sub-protrusions 1110 do not excessively occupy the space of the heat dissipation plate 110 along the length direction X, which is beneficial to the miniaturization of the heat dissipation plate 110. L10>L17, L18>L17, so that the surface of the three power modules 210 fixed with the three sub-protrusions 1110 can be flowed through by the flowing cooling liquid in the groove 112, which is beneficial to the cooling of the power modules 210 by the cooling liquid and improves the cooling efficiency of the heat dissipation plate 110.

[0139] In the embodiment of the present application, as shown in FIG. 13, the spacing between two adjacent sub-protrusions 1110 is L19, L19

[0140] FIG. 14 is another structure schematic diagram of the heat dissipation plate 110 provided by another embodiment of the present application.

[0141] In one embodiment, the groove 112 includes three sub-grooves 1120, as shown in FIG. 12 and FIG. 14, the three sub-grooves 1120 are arranged at intervals along the length direction X of the heat dissipation plate 110, and one sub-groove 1120 is stacked with one sub-protrusion 1110 along the recess direction Z of the groove 112. Along the length direction X of the heat dissipation plate 110, the length of one sub-groove 1120 is greater than the length of one sub-protrusion 1110 stacked therewith. Along the width direction Y of the heat dissipation plate 110, the width of one sub-groove 1120 is greater than the width of one sub-protrusion 1110 stacked therewith.

[0142] In the embodiment of the present application, the three sub-grooves 1120 can form three parallel or series cooling liquid flow channels on the side surface 110b, one sub-groove 1120 is stacked with one sub-protrusion 1110 along the recess direction Z of the groove 112, so that the cooling liquid can simultaneously cool and cool the three power modules 210 respectively, which is beneficial to improve the cooling efficiency of the heat dissipation plate 110.

[0143] In the embodiment of the present application, along the length direction X of the heat dissipation plate 110, the length of one sub-groove 1120 is greater than the length of one sub-protrusion 1110 stacked with it, so that the length of one sub-protrusion 1110 does not exceed the length of one sub-groove 1120, one sub-protrusion 1110 does not occupy too much space of the heat dissipation plate 110 along the length direction X, which is beneficial to the miniaturization of the heat dissipation plate 110. Also, the part of one sub-groove 1120 other than the part stacked with one sub-protrusion 1110 has a relatively thin thickness, which is beneficial to the weight reduction of the heat dissipation plate 110.

[0144] In the embodiment of the present application, along the width direction Y of the heat dissipation plate 110, the width of one sub-groove 1120 is greater than the width of one sub-protrusion 1110 stacked with it, so that when one sub-protrusion 1110 can stably fix one power module 210, the part of the width direction Y side surface 110a of the heat dissipation plate 110 other than one sub-protrusion 1110 can have a larger spacing with the power module 210, which is beneficial to avoiding the electrical influence of the heat dissipation plate 110 on the plurality of power modules 210, enabling the plurality of power modules 210 to work normally, and improving the operation safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0145] In one embodiment, as shown in FIGS. 12 and 14, along the recess direction Z of the groove 112, the center of each sub-protrusion 1110 is aligned with the center of one power module 210.

[0146] In the embodiment of the present application, the center of each sub-protrusion 1110 is aligned with the center of one power module 210, so that each sub-protrusion 1110 can more stably fix one power module 210, and also can enable the cooling liquid in one sub-groove 1120 stacked with one sub-protrusion 1110 to better cool and cool one power module 210, which is beneficial to improving the cooling efficiency. The center of each sub-protrusion 1110 is aligned with the center of one power module 210, which can also make the liquid-cooled power module 100 arranged in an orderly manner, so that the liquid-cooled power module 100 occupies less space along the length direction X and the width direction Y of the heat dissipation plate 110.

[0147] FIG. 15 is a partial enlarged view of the M2 part of the heat dissipation plate 110 in FIG. 9.

[0148] In one embodiment, as shown in FIGS. 9 and 15, the distance between the circumferential side wall 112a of the groove 112 and each adjacent heat dissipation fin 113 is less than the distance between each adjacent two heat dissipation fins 113.

[0149] In the embodiment of the present application, as shown in FIG. 15, for example, one heat dissipation fin 113 adjacent to the circumferential wall 112a is denoted as heat dissipation fin 113a, and the two heat dissipation fins 113 adjacent to each other are denoted as 113b and 113c, respectively. Since the recess 112 is formed in the embodiment of the present application to sink the plurality of heat dissipation fins 113 towards the plurality of power modules 210, a gap between the circumferential wall 112a of the recess 112 and the heat dissipation fin 113a, which can flow the cooling liquid, is formed. In the embodiment of the present application, the gap between the circumferential wall 112a of the recess 112 and the heat dissipation fin 113a is smaller than the gap between the two adjacent heat dissipation fins 113, and the greater the gap, the smaller the resistance of the cooling liquid flow. When the cooling liquid flows into the liquid cooling heat dissipation cavity 101 of the heat dissipation plate 110, the cooling liquid can be prevented from bypassing the circumferential wall 112a of the recess 112 and flowing more between the heat dissipation fins 113, the residence time of the cooling liquid in the heat dissipation plate 110 is prolonged, the flow of the cooling liquid by the heat dissipation fins 113 is increased, the cooling area of the cooling liquid and the heat dissipation fins 113 is increased, and the cooling effect of the heat dissipation plate 110 on the plurality of power modules 210 is improved.

[0150] In one embodiment, as shown in FIGS. 9, 10 and 15, the gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto is less than or equal to 0.5 mm.

[0151] In the embodiment of the present application, the gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto is less than or equal to 0.5 mm. The smaller gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto makes the cooling liquid flow more between the heat dissipation fins 113, prolongs the residence time of the cooling liquid in the heat dissipation plate 110, increases the flow of the cooling liquid by the heat dissipation fins 113, increases the cooling area of the cooling liquid and the heat dissipation fins 113, and improves the cooling effect of the heat dissipation plate 110 on the plurality of power modules 210.

[0152] For example, the gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto is 0. The heat dissipation fin 113 adjacent to the circumferential wall 112a of the recess 112 directly abuts the circumferential wall 112a, so that the cooling liquid flows entirely between the heat dissipation fins 113, and the cooling effect is further improved.

[0153] For example, the gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto is 0.2 mm.

[0154] For example, the gap between the circumferential wall 112a of the recess 112 and each heat dissipation fin 113 adjacent thereto is 0.5 mm.

[0155] FIG. 16 is another cross-sectional view of the liquid-cooled power module 100 provided by the embodiment of the present application.

[0156] In an embodiment, as shown in FIG. 5, FIG. 9 and FIG. 16, the side surface 110b further comprises a sealing groove 114 surrounding the groove 112, and the sealing groove 114 is used to accommodate a sealing ring 114a for sealing the liquid cooling cavity 101 formed by the side surface 110b of the heat dissipation plate 110 and the heat dissipation plate 310. In the recess direction Z of the groove 112, the sealing groove 114 is recessed towards the side surface 110a, and the depth of the sealing groove 114 is less than or equal to the groove depth of the groove 112.

[0157] In the embodiment, the side surface 110b further comprises a sealing groove 114 surrounding the groove 112, and the peripheral side wall 112a of the groove 112 has a larger thickness. The sealing groove 114 is arranged on the peripheral side of the groove 112, which has less impact on the structural strength of the heat dissipation plate 110, and also enables the sealing ring 114a accommodated in the sealing groove 114 to fully seal the groove 112 in the peripheral direction, which is conducive to improving the sealing effect and preventing the cooling liquid in the liquid cooling cavity 101 from leaking and affecting the electrical components in the motor controller 13.

[0158] In the embodiment, in the recess direction Z of the groove 112, the sealing groove 114 is recessed towards the side surface 110a, so that the sealing groove 114 can accommodate the sealing ring 114a and cooperate with the heat dissipation plate 310 to form the liquid cooling cavity 101. The depth of the sealing groove 114 is less than or equal to the groove depth of the groove 112, so that the groove depth of the sealing groove 114 does not affect the overall structural strength of the heat dissipation plate 110, which is conducive to ensuring the structural stability of the heat dissipation plate 110.

[0159] The liquid cooling power module for the motor controller, the motor controller, the powertrain and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range can be changed, and the above description should not be understood as limiting the present application.

Claims

1. A liquid-cooled power module for an electric machine controller, characterized by, The motor controller is used for controlling a motor of an electric vehicle to drive wheels of the electric vehicle, and the liquid-cooled power module comprises: an inverter module, the inverter module comprising three-phase bridge arms for receiving power supply from a power battery of the electric vehicle and outputting three-phase current to drive the motor of the electric vehicle, the three-phase bridge arms comprising a plurality of power modules; a heat sink, the heat sink comprising two sides, the two sides being opposite to each other along a thickness direction of the heat sink, one side being used for fixing the plurality of power modules of the three-phase bridge arms, and the other side being used for enclosing another heat sink to form a liquid-cooled heat dissipation cavity, the other side comprising a groove and a plurality of heat dissipation teeth, the groove being recessed along the thickness direction of the heat sink towards the plurality of power modules of the three-phase bridge arms, and each of the heat dissipation teeth extending from a bottom of the groove along a stacking direction of each of the power modules and the heat sink, an extension length of each of at least part of the heat dissipation teeth being greater than a depth of the groove.

2. The liquid-cooled power module of claim 1, wherein, The one side comprises a protrusion, the protrusion protruding away from the other side along a recess direction of the groove, the protrusion being used for fixing the plurality of power modules, and the protrusion being stacked with the plurality of heat dissipation teeth along the recess direction of the groove.

3. The liquid-cooled power module of claim 2, wherein, The thickness of the protrusion along the recess direction of the groove is less than or equal to the depth of the groove.

4. The liquid-cooled power module of claim 2 or 3, wherein, The thickness of the protrusion along the recess direction of the groove is less than the extension length of each of the at least part of the heat dissipation teeth.

5. The liquid-cooled power module of any of claims 2-4, wherein, The thickness of the protrusion along the recess direction of the groove is greater than or equal to 1 mm.

6. The liquid-cooled power module of any of claims 2-5, wherein, The length of the heat sink along a width direction thereof is less than the length of the heat sink along a length direction thereof, wherein: along the width direction of the heat sink, the width of the protrusion is less than the width of the groove, the width of the protrusion being greater than half of the width of the groove; the width of the protrusion being less than the width of one of the power modules fixed thereto, and the width of the protrusion being greater than half of the width of one of the power modules fixed thereto; along the length direction of the heat sink, the length of the protrusion is less than the length of the groove, the length of the protrusion being greater than half of the length of the groove; the length of the protrusion being less than the sum of the lengths of the plurality of power modules fixed thereto, and the length of the protrusion being greater than half of the sum of the lengths of the plurality of power modules fixed thereto.

7. The liquid-cooled power module of any of claims 2-6, wherein, The plurality of power modules are arranged at intervals along the length direction of the heat sink, each of the power modules comprising two groups of transmission copper bars arranged opposite to each other along the width direction of the heat sink, and the length of the heat sink along the length direction thereof is greater than the length of the heat sink along the width direction thereof, wherein: The distance between the two groups of transmission copper bars of one power module along the width direction of the one heat sink is greater than the width of the one protrusion fixed thereto. Each group of transmission copper bars has a gap with the one side along the recess direction of the one recess, at least part of the one side is exposed in the gap. The gap along the recess direction of the one recess is greater than or equal to the thickness of the one protrusion.

8. The liquid-cooled power module of claim 7, wherein, The gap along the recess direction of the one recess is greater than or equal to the depth of the one recess, and the gap is less than the extension length of each of the at least part of the heat dissipation teeth.

9. The liquid-cooled power module of any of claims 2-8, wherein, The one heat sink further comprises a plurality of fixing protrusions for fixing the other heat sink, the length of the one heat sink along its length direction is greater than the length of the one heat sink along its width direction, wherein: Each of the fixing protrusions protrudes away from the one recess along the width direction of the one heat sink, and the plurality of fixing protrusions are distributed on both sides of the one recess. Each of the fixing protrusions is spaced apart from the transmission copper bars of one power module adjacent thereto along the length direction of the one heat sink. The thickness of each of the fixing protrusions is greater than the depth of the one recess along the recess direction of the one recess, and the thickness of each of the fixing protrusions is less than or equal to the extension length of each of the at least part of the heat dissipation teeth.

10. The liquid-cooled power module of any of claims 2-9, wherein, The one protrusion comprises three sub-protrusions arranged at intervals along the length direction of the one heat sink, and each of the sub-protrusions is used for fixing one power module, wherein: The length of the one recess along the length direction of the one heat sink is greater than the sum of the lengths of the three sub-protrusions, the maximum distance between two heat dissipation teeth is greater than the sum of the lengths of the three sub-protrusions, and the distance between two adjacent sub-protrusions is less than the length of each of the sub-protrusions.

11. The liquid-cooled power module of any of claims 1-10, wherein, The distance between the peripheral side wall of the one recess and each of the heat dissipation teeth adjacent thereto is less than the distance between each of the adjacent heat dissipation teeth.

12. The liquid-cooled power module of any of claims 1-11, wherein, The other side further comprises a sealing groove surrounding the one recess, the sealing groove is used for accommodating a sealing ring for sealing the liquid cooling heat dissipation cavity formed by the other side of the one heat sink and the other heat sink, wherein: The sealing groove is recessed towards the one side along the recess direction of the one recess, and the depth of the sealing groove is less than or equal to the depth of the one recess.

13. An electric machine controller characterized by The motor controller comprises a housing and a liquid cooling power module as claimed in any one of claims 1-12, the housing is used for accommodating the liquid cooling power module, and the internal flow channel of the housing is used for communicating the one liquid cooling heat dissipation cavity in the liquid cooling power module.

14. A powertrain, characterized by, The power assembly comprises a motor and a motor controller as claimed in claim 13, and the motor is used for receiving power supply from the liquid cooling power module of the motor controller.

15. An electric vehicle characterized by comprising: The electric vehicle comprises a frame, a power battery and the power assembly as claimed in claim 14, the frame is used for fixing the power battery and the power assembly, and the motor of the power assembly is used for receiving power supply of the power battery through the motor controller to drive the wheels.

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