Liquid cooling power module for motor controller, motor controller, power assembly and electric vehicle

Abstract

The utility model provides a liquid cooling power module for a motor controller, the motor controller, a power assembly and an electric vehicle. The liquid cooling power module comprises an inversion module and a heat dissipation plate. Each heat dissipation plate comprises two side faces, the two side faces are opposite in the thickness direction of the heat dissipation plate, one side face is used for fixing a plurality of power modules of a three-phase bridge arm of the inversion module, the other side face is used for enclosing the other heat dissipation plate to form a liquid cooling heat dissipation cavity, and the other side face comprises a groove and a plurality of heat dissipation teeth. The concave direction of the groove faces the multiple power modules in the thickness direction of the heat dissipation plate, each heat dissipation tooth extends from the groove bottom of the groove in the stacking direction of the power modules and the heat dissipation plate, and the extending length of at least part of each heat dissipation tooth is larger than the depth of the groove. The heat dissipation area is increased, the cooling efficiency is improved, the integration degree of the heat dissipation plate is improved, the size of the liquid cooling power module is reduced, and the motor controller can be arranged in a miniaturized mode.

Description

Technical Field

[0001] The present application relates to the technical field of powertrains, and particularly to a liquid-cooled power module for a motor controller, a motor controller, a powertrain, and an electric vehicle. Background Art

[0002] Currently, in the field of electric vehicles, the powertrain includes a motor controller and a motor. The motor controller supplies power to the motor to drive the wheels of the vehicle. The motor controller includes multiple electronic and electrical components such as bus capacitors, power modules, radiators, and circuit boards. The number of components is large, the assembly is complex, and the integration degree of the radiator is low, resulting in a large volume of the motor controller. Summary of the Utility Model

[0003] The present application provides a liquid-cooled power module for a motor controller, a motor controller, a powertrain, and an electric vehicle.

[0004] In a first aspect, 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 dissipation plate. The inverter module includes three-phase bridge arms. The three-phase bridge arms are used to receive power supply from the power battery of the electric vehicle and output three-phase current to drive the motor of the electric vehicle. The three-phase bridge arms include multiple power modules. The heat dissipation plate includes two sides. The orientations of the two sides are opposite along the thickness direction of the heat dissipation plate. One side is used to fix the multiple power modules of the three-phase bridge arms, and the other side is used to enclose another heat dissipation plate to form a liquid-cooled heat dissipation cavity. The other side includes a groove and multiple heat dissipation teeth. The depression direction of the groove is along the thickness direction of the heat dissipation plate and faces the multiple power modules of the three-phase bridge arms. Each heat dissipation tooth extends from the bottom of the groove along the stacking direction of each power module and the heat dissipation plate. The extension length of at least some of the multiple heat dissipation teeth is greater than the depth of the groove.

[0005] In an embodiment of the present application, another side surface is used to enclose another heat sink to form a liquid-cooled heat dissipation cavity, and the other side surface includes a groove and a plurality of heat dissipation teeth. The groove formed by a heat sink with heat dissipation teeth can be used for the circulation of coolant, so that the contact area between the coolant and the plurality of heat dissipation teeth is larger, so that the area of contact between a heat sink and the coolant is larger, so that a heat sink has a larger heat dissipation space, which is conducive to improving the cooling effect of a heat sink on multiple power modules. The other side surface includes a groove and a plurality of heat dissipation teeth. Compared with directly arranging heat dissipation teeth on the other side surface of a heat sink, the plurality of heat dissipation teeth of a heat sink are arranged in a sunken manner along the concave direction of the groove, which can reduce the thickness of a heat sink, reduce the weight of a heat sink, and save space along the thickness direction of a heat sink. The groove formed by a heat sink with heat dissipation teeth can be used for the circulation of coolant, and also make the integration of a heat sink and the plurality of power modules of the three-phase bridge arm higher, which is conducive to the miniaturization of the liquid-cooled power module, and then to the miniaturization layout of the motor controller.

[0006] In the embodiment of the present application, the concave direction of the groove is along the thickness direction of a heat sink toward the multiple power modules of the three-phase bridge arm, so that the groove bottom of the groove is thinner. Even if multiple heat dissipation teeth extend from the groove bottom along the stacking direction of each power module and a heat sink, the thickness of a heat sink can be thinner, which is beneficial to weight reduction and saving space of a heat sink along its thickness direction. The concave direction of the groove is along the thickness direction of a heat sink toward the multiple power modules of the three-phase bridge arm, and the coolant flowing in the groove can also take away the heat of multiple power modules faster through a heat sink with a thinner thickness, thereby improving the heat dissipation efficiency.

[0007] In the embodiment of the present application, each heat dissipation tooth extends from the bottom of the groove along the stacking direction of each power module and a heat sink, so that the heat dissipation tooth has more contact area with the coolant flowing in the liquid-cooled heat dissipation cavity, thereby increasing the heat dissipation area of a heat sink, which is beneficial to improving the heat dissipation efficiency of a heat sink for the power module and ensuring the safe operation of the liquid-cooled power module in the motor controller.

[0008] In an embodiment of the present application, the extension length of each of at least some of the heat dissipation teeth is greater than the depth of the groove. The length of at least some of the heat dissipation teeth is relatively long, so that the heat dissipation teeth can make full use of the space in the depth direction of the groove, contact the coolant as much as possible, form a larger heat dissipation area, and improve the cooling effect of one heat dissipation plate on multiple power modules. If the extension length of each of at least some of the heat dissipation teeth is less than the depth of the groove, when the coolant flows in the groove, there is a gap between the upper surface of the teeth of multiple heat dissipation teeth and another heat dissipation plate, resulting in a gap flow channel between the upper surface of the teeth and another heat dissipation plate for the coolant, thereby reducing the stirring and turbulent flow effect of the heat dissipation teeth on the coolant and making the cooling effect poor. Only when the extension length of each of at least some of the heat dissipation teeth is greater than the depth of the groove can the processing difficulty on the other side be reduced.

[0009] In one embodiment, one side surface includes a protrusion. Along the concave direction of one groove, one protrusion faces away from the protrusion on the other side surface. One protrusion is used to fix multiple power modules, and along the concave direction of one groove, one protrusion is stacked on multiple heat dissipation teeth.

[0010] In an embodiment of the present application, one side surface includes a protrusion. Along the concave direction of the groove, the protrusion faces away from the protrusion on the other side surface. The protrusion is used to fix multiple power modules, so that the multiple power modules are spaced apart from the surface of one side surface except the protrusion, avoiding the electrical influence of one heat dissipation plate on the multiple power modules, enabling the multiple power modules to work normally, and improving the operating safety performance of the liquid-cooled power module in the motor controller.

[0011] In an embodiment of the present application, along the concave direction of the groove, the protrusion is stacked on multiple heat dissipation teeth. Although the protrusion will increase the thickness of one heat dissipation plate, the heat dissipation teeth on the other side surface are concave from the other side surface, so that the thickness of the area where the heat dissipation teeth are located and the bottom of the groove is relatively small, and the overall thickness of one heat dissipation plate will not become larger. Furthermore, while reducing the electrical influence of the multiple power modules on one heat dissipation plate, one heat dissipation plate can still have a relatively small thickness in its thickness direction. The protrusion along the concave direction of the groove being stacked on multiple heat dissipation teeth is also beneficial for shortening the distance between the flow channels between multiple heat dissipation teeth and the power modules fixed by the protrusion along the concave direction of the groove, enabling the coolant flowing between multiple heat dissipation teeth to better dissipate heat from the multiple power modules fixed to the protrusion and improving the heat dissipation efficiency.

[0012] In one embodiment, along the concave direction of one groove, the thickness of one protrusion is less than or equal to the depth of one groove.

[0013] In an embodiment of the present application, along the recessed direction of a groove, the thickness of the protrusion is less than or equal to the depth of the groove, so that the overall thickness of a heat dissipation plate is relatively small, which is beneficial to reducing the weight of a heat dissipation plate, and is also beneficial to making the overall volume of the liquid-cooled power module relatively small, and further beneficial to the miniaturized layout of the liquid-cooled power module in the motor controller.

[0014] In one embodiment, along the recessed direction of a groove, the thickness of a protrusion is less than the extension length of each of at least some of the heat dissipation teeth.

[0015] In an embodiment of the present application, at least some of the heat dissipation teeth refer to the heat dissipation teeth whose extension length is greater than the depth of the groove. Along the recessed direction of the groove, the thickness of the protrusion is less than the extension length of each of the at least some of the heat dissipation teeth. The extension length of the heat dissipation teeth is relatively large, so that the contact area between the coolant and the heat dissipation teeth is relatively large, which improves the cooling efficiency of the coolant on the heat dissipation teeth, and thus improves the heat dissipation effect of the heat dissipation teeth on the power module while reducing the overall thickness of a heat dissipation plate.

[0016] In one embodiment, along the recessed direction of a groove, the thickness of a protrusion is greater than or equal to 1 mm.

[0017] In an embodiment of the present application, along the recessed direction of the groove, the thickness of the protrusion is greater than or equal to 1 mm, so that there is a sufficiently large gap between the part of a side surface other than the protrusion and the multiple power modules fixed to the protrusion, avoiding the electrical influence of a heat dissipation plate on the multiple power modules, enabling the multiple power modules to work normally, and improving the safety performance of the liquid-cooled power module in the motor controller.

[0018] In one embodiment, the length of a heat dissipation plate along its width direction is less than the length of the heat dissipation plate along its length direction. Among them, along the width direction of a heat dissipation plate, the width of a protrusion is less than the width of a groove, and the width of a protrusion is greater than half of the width of a groove. The width of a protrusion is less than the width of a power module fixed to it, and the width of a protrusion is greater than half of the width of a power module fixed to it.

[0019] Along the length direction of a heat dissipation plate, the length of a protrusion is less than the length of a groove, and the length of a protrusion is greater than half of the length of a groove. The length of a protrusion is less than the sum of the lengths of the multiple power modules fixed to it, and the length of a protrusion is greater than half of the sum of the lengths of the multiple power modules fixed to it.

[0020] In an embodiment of the present application, the length of a heat dissipation plate along its width direction is less than the length of the heat dissipation plate along its length direction, so that the multiple power modules can be arranged along the length direction of a heat dissipation plate.

[0021] In the embodiment of the present application, along the width direction of a heat dissipation plate, the width of the protrusion is less than the width of the groove, and the width of the protrusion is greater than half of 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 overly occupy the space of a heat dissipation plate along its width direction, which is beneficial to the miniaturization of a heat dissipation plate. The width of the groove being greater than the width of the protrusion enables the flow channel between multiple heat dissipation teeth in the groove area to have a larger area for circulating the coolant, improving the heat dissipation effect of the flow channel between multiple heat dissipation teeth on the power module. Along the width direction of a heat dissipation plate, the width of the protrusion is less than the width of the groove, and the width of the protrusion is greater than half of the width of the groove, which also makes the part of the groove other than the part overlapping with the protrusion have a thinner thickness, facilitating the weight reduction of a heat dissipation plate.

[0022] In the embodiment of the present application, the width of the protrusion is less than the width of a power module fixed thereto, and the width of the protrusion is greater than half of the width of a power module fixed thereto. The width of a power module refers to the width of the encapsulated part along the width direction of a heat dissipation plate. The width of the protrusion being less than the width of a power module fixed thereto and the width of the protrusion being greater than half of the width of a power module fixed thereto enable a larger gap between the side other than the protrusion and the power module along the width direction of a heat dissipation plate when the protrusion can stably fix multiple power modules, which is beneficial to avoiding the electrical influence of a heat dissipation plate on multiple power modules, enabling multiple power modules to operate normally, and improving the operating safety performance of the liquid-cooled power module in the motor controller.

[0023] In the embodiment of the present application, along the width direction of a heat dissipation plate, the width of the protrusion is less than the width of the groove, and the width of the protrusion is greater than half of the width of the groove. The width of the protrusion is less than the width of a power module fixed thereto, and the width of the protrusion is greater than half of the width of a power module fixed thereto, which is beneficial for the coolant flowing in the groove to absorb the heat generated by multiple power modules faster and cool down multiple power modules.

[0024] 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 of 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 overly occupy the space of a heat dissipation plate along its length direction, which is beneficial to the miniaturization of a heat dissipation plate. The width of the groove being greater than the width of the protrusion enables the flow channel between multiple heat dissipation teeth in the groove area to have a larger area for circulating the coolant, improving the heat dissipation effect of the flow channel between multiple heat dissipation teeth on the power module. The length of the protrusion being less than the length of the groove and the length of the protrusion being greater than half of the length of the groove also makes the part of the groove other than the part overlapping with the protrusion have a thinner thickness, facilitating the weight reduction of a heat dissipation plate.

[0025] In an embodiment of the present application, the length of the protrusion is less than the sum of the lengths of the multiple power modules fixed thereto, and the length of the protrusion is greater than half of the sum of the lengths of the multiple power modules fixed thereto. When the protrusion can stably fix the multiple power modules, a greater gap can be provided between the part other than the protrusion on one side along the length direction of one heat dissipation plate and the power modules, which is beneficial to avoiding the electrical influence of one heat dissipation plate on the multiple power modules, enabling the multiple power modules to operate normally, and improving the operating safety performance of the liquid-cooled power module in the motor controller.

[0026] In an embodiment of the present application, along the length direction of one heat dissipation plate, the length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half of the length of the groove. The length of the protrusion is less than the sum of the lengths of the multiple power modules fixed thereto, and the length of the protrusion is greater than half of the sum of the lengths of the multiple power modules fixed thereto, which is beneficial for the coolant flowing between the multiple heat dissipation teeth in the groove to absorb the heat generated by the multiple power modules faster and cool down the multiple power modules.

[0027] In one embodiment, the multiple power modules are arranged at intervals along the length direction of one heat dissipation plate. Each power module includes two sets of transmission copper bars, and the two sets of transmission copper bars are arranged opposite to each other along the width direction of one heat dissipation plate. The length of one heat dissipation plate along its length direction is greater than the length of one heat dissipation plate along its width direction. Among them, along the width direction of one heat dissipation plate, the distance between the two sets of transmission copper bars of one power module is greater than the width of one protrusion fixed thereto. Along the depression direction of one groove, each set of transmission copper bars has a gap with one side surface, and at least part of one side surface is exposed in the gap. Along the depression direction of one groove, the gap is greater than or equal to the thickness of one protrusion.

[0028] In an embodiment of the present application, along the width direction of one heat dissipation plate, the distance between the two sets of transmission copper bars of one power module is greater than the width of the protrusion fixed thereto, so that along the width direction of one heat dissipation plate, the two sets of transmission copper bars of the power module can have a larger gap with the part other than the protrusion on one side surface. The protrusion fixes the power module farther away from one side surface, so that it is not necessary to paste an insulating film on one side surface, which can reduce costs and also ensure compliance with safety regulations.

[0029] In an embodiment of the present application, each set of transmission copper bars has a gap with one side surface along the depression direction of the groove, and at least part of one side surface is exposed in the gap, so that each set of transmission copper bars of the power module can avoid electrical interference with one side surface through the gap, and it is also possible to achieve electrical safety without pasting an insulating film on one side surface, reducing production costs.

[0030] In the embodiments of the present application, the gap along the recessed direction of the groove is greater than or equal to the thickness of the protrusion. The gap along the recessed direction of the groove is relatively large, such that one side surface and the transmission copper bar opposite thereto can have a larger spacing from the transmission copper bar of the power module, which is more conducive to achieving 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.

[0031] In one embodiment, along the recessed direction of a groove, the gap 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 some of the heat dissipation teeth.

[0032] In the embodiments of the present application, along the recessed direction of the groove, the gap 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 some of the heat dissipation teeth, where at least some of the heat dissipation teeth refer to the heat dissipation teeth with an extension length greater than the depth of the groove. This makes the size of the gap smaller. While ensuring that the gap realizes the safety distance for electrical isolation between a heat dissipation plate and multiple power modules, it does not overly increase the overall thickness of a heat dissipation plate, which is conducive to the liquid-cooled power module occupying less space along the groove direction of the groove and is conducive to the miniaturized layout of the liquid-cooled power module in the motor controller.

[0033] In one embodiment, a heat dissipation plate further includes a plurality of fixing protrusions for fixing another heat dissipation plate. The length of a heat dissipation plate along its length direction is greater than the length of the heat dissipation plate along its width direction. Among them, along the width direction of a heat dissipation plate, each fixing protrusion faces away from the groove protrusion, and the plurality of fixing protrusions are distributed on both sides of a groove. Along the length direction of a heat dissipation plate, each fixing protrusion is spaced from the transmission copper bar of a power module adjacent thereto. Along the recessed direction of a 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 some of the heat dissipation teeth.

[0034] In the embodiments of the present application, a heat dissipation plate further includes a plurality of fixing protrusions for fixing another heat dissipation plate. The other heat dissipation plate is used to enclose with another side surface to form a liquid-cooled heat dissipation cavity, and the plurality of fixing protrusions are conducive to making the formed structure of the liquid-cooled heat dissipation cavity more stable.

[0035] In the embodiment of the present application, since a groove is formed on another side surface of a heat dissipation plate, the structural strength of the heat dissipation plate is reduced. By providing a plurality of fixing protrusions, and along the width direction of a 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 a heat dissipation plate is enhanced. Along the width direction of a 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, which can also enable the plurality of fixing protrusions in the depression direction of the groove to have a sufficient large interval from the two sets of transmission copper bars of the plurality of power modules to ensure electrical safety.

[0036] In the embodiment of the present application, along the length direction of a heat dissipation plate, each fixing protrusion is spaced from the transmission copper bar of a power module adjacent to it, so that the fixing protrusion has a safe electrical distance from the power module, which is beneficial to ensuring the normal operation of the liquid-cooled power module.

[0037] In the embodiment of the present application, along the depression 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 some of the heat dissipation teeth, so that when the fixing protrusion strengthens the strength of the groove, the thickness of the fixing protrusion will not be too thick, which is beneficial to reducing the weight of a heat dissipation plate, and is also beneficial to making the space occupied by a heat dissipation plate and another heat dissipation plate in the depression direction of the groove smaller when the other heat dissipation plate forms a liquid-cooled heat dissipation cavity with the other side surface. In the embodiment of the present application, at least some of the heat dissipation teeth refer to the heat dissipation teeth whose extension length is greater than the depth of the groove.

[0038] In one embodiment, a protrusion includes three sub-protrusions, and the three sub-protrusions are arranged at intervals along the length direction of a heat dissipation plate, and each sub-protrusion is used to fix a power module. Among them, along the length direction of a heat dissipation plate, the length of a 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 two adjacent sub-protrusions is less than the length of each sub-protrusion.

[0039] In the embodiment of the present application, the protrusion includes three sub-protrusions, and the three sub-protrusions are arranged at intervals along the length direction of a heat dissipation plate, and each sub-protrusion is used to fix a power module, so that more parts of the groove have a thinner thickness along the thickness direction of a heat dissipation plate, which is beneficial to reducing the weight of a heat dissipation plate, and is also beneficial to the coolant flowing in the groove to absorb the heat of the power module faster and improve the cooling efficiency.

[0040] In the embodiment of the present application, along the length direction of a heat dissipation plate, the length of the groove is greater than the sum of the lengths of the three sub-protrusions, so that the lengths of the three sub-protrusions do not exceed the length of the groove, and the three sub-protrusions do not occupy too much space of a heat dissipation plate along its length direction, which is beneficial to the miniaturization of a 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 to the three sub-protrusions can all be flowed through by the coolant flowing in the groove, which is beneficial to the coolant to cool down the power modules and improve the cooling efficiency of a heat dissipation plate.

[0041] In the embodiment of the present application, the distance between two adjacent sub-protrusions is less than the length of each sub-protrusion, so that each sub-protrusion has enough space to fix the power module, and it is also beneficial to arrange more sub-protrusions on one side. The distance between two adjacent sub-protrusions is less than the length of each sub-protrusion, and it can also make the three sub-protrusions not occupy too much space of a heat dissipation plate along its length direction, which is beneficial to the miniaturized layout of the liquid-cooled power module.

[0042] In one embodiment, the distance between the peripheral side wall of a groove and each adjacent heat dissipation tooth is less than the distance between every two adjacent heat dissipation teeth.

[0043] Since in the embodiment of the present application, in order to sink multiple heat dissipation teeth towards multiple power modules to form a groove, a gap is formed between the peripheral side wall of the groove and the heat dissipation teeth, and the coolant can flow through this gap. In the embodiment of the present application, the distance between the peripheral side wall of the groove and the heat dissipation teeth is less than the distance between two adjacent heat dissipation teeth, and the greater the distance, the smaller the resistance of the coolant flow. When the coolant flows into the liquid-cooled heat dissipation cavity of a heat dissipation plate, it can avoid the coolant bypassing through the peripheral side wall of the groove and flow more between the heat dissipation teeth, prolong the residence time of the coolant in a heat dissipation plate, increase the agitation of the coolant by the heat dissipation teeth, and it is also beneficial for the coolant to have a larger cooling area with the heat dissipation teeth, so that the cooling effect of a heat dissipation plate on multiple power modules is improved.

[0044] In one embodiment, the other side further includes a sealing groove. A sealing groove surrounds a groove. A sealing groove is used to accommodate a sealing ring. A sealing ring is used to seal the liquid-cooled heat dissipation cavity formed by the other side of a heat dissipation plate and another heat dissipation plate. Wherein, along the concave direction of a groove, a sealing groove is recessed towards one side, and the depth of a sealing groove is less than or equal to the groove depth of a groove.

[0045] In an embodiment of the present application, another side further includes a sealing groove, the sealing groove surrounds the groove, the peripheral side wall of the groove has a relatively large thickness, and the sealing groove is arranged on the periphery of the groove, so that the influence on the structural strength of a heat dissipation plate is small. Moreover, a sealing ring accommodated in the sealing groove can comprehensively seal the groove along the circumferential direction of the groove, which is beneficial to improving the sealing effect and preventing the coolant in the liquid cooling heat dissipation cavity from leaking and affecting the electrical components in the motor controller.

[0046] In an embodiment of the present application, along the depression direction of the groove, the sealing groove is recessed towards one side, so that the sealing groove can accommodate the sealing ring and cooperate with another heat dissipation plate to form a liquid cooling heat dissipation cavity. The depth of the sealing groove is less than or equal to the depth of the groove, so that the depth of the sealing groove will not affect the overall structural strength of a heat dissipation plate, which is beneficial to ensuring the structural stability of a heat dissipation plate.

[0047] In a second aspect, the present application provides a motor controller, which includes a housing and a liquid cooling power module as in the first aspect. The housing is used to accommodate the liquid cooling power module, and the internal flow channel of the housing is used to communicate with a liquid cooling heat dissipation cavity in the liquid cooling power module.

[0048] In the liquid cooling power module in an embodiment of the present application, by using another side to form a downwardly recessed groove and multiple downwardly sunken heat dissipation teeth, the heat dissipation teeth and the coolant flowing through the groove can have a larger contact area, improving the cooling efficiency of a heat dissipation plate for multiple power modules. The multiple heat dissipation teeth extend from the bottom of the groove to reduce the thickness of the heat dissipation plate, improving the integration degree of a heat dissipation plate, and further improving the integration degree of the liquid cooling power module. This is beneficial to the overall small volume of the liquid cooling power module and is conducive to the miniaturized layout of the motor controller.

[0049] In a third aspect, the present application provides a powertrain, which includes a motor and a motor controller as in the second aspect. The motor is used to receive the power supply from the liquid cooling power module of the motor controller.

[0050] The motor controller in an embodiment of the present application includes a liquid cooling power module. By using another side to form a downwardly recessed groove and multiple downwardly sunken heat dissipation teeth, the heat dissipation teeth and the coolant flowing through the groove can have a larger contact area, improving the cooling efficiency of a heat dissipation plate for multiple power modules. The multiple heat dissipation teeth extend from the bottom of the groove to reduce the thickness of the heat dissipation plate, improving the integration degree of a heat dissipation plate, and further improving the integration degree of the liquid cooling power module. This is beneficial to the overall small volume of the liquid cooling power module and is conducive to the miniaturized layout of the motor controller. Furthermore, it is conducive to the miniaturized layout of the powertrain.

[0051] Fourth aspect, an electric vehicle, which includes a vehicle frame, a power battery, and a power assembly as in the third aspect. The vehicle frame is used to fix the power battery and the power assembly, and the motor of the power assembly is used to receive power supply from the power battery through a motor controller to drive the wheels.

[0052] In the power assembly in the embodiments of the present application, the liquid-cooled power module of the motor controller forms a downwardly concave groove and multiple downwardly sunken heat dissipation teeth by using another side surface, so that the heat dissipation teeth and the coolant flowing through the groove can have a larger contact area, improving the cooling efficiency of one heat dissipation plate for multiple power modules. The multiple heat dissipation teeth extend from the bottom of the groove to reduce the thickness of the heat dissipation plate, improving the integration degree of one heat dissipation plate, and further improving the integration degree of the liquid-cooled power module, which is beneficial to the overall small volume of the liquid-cooled power module, beneficial to the miniaturized layout of the motor controller, and further beneficial to the miniaturized layout of the power assembly, optimizing the overall vehicle layout. Description of the Drawings

[0053] 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.

[0054] Figure 1 is a schematic structural diagram of the electric vehicle provided by the embodiments of the present application;

[0055] Figure 2 is a schematic structural diagram of the power assembly provided by the embodiments of the present application;

[0056] Figure 3 is a schematic structural diagram of the liquid-cooled power module provided by the embodiments of the present application;

[0057] Figure 4 is an exploded view of the liquid-cooled power module provided by the embodiments of the present application;

[0058] Figure 5 is another schematic structural diagram of the liquid-cooled power module provided by the embodiments of the present application;

[0059] Figure 6 is a cross-sectional view of the heat dissipation plate provided by the embodiments of the present application;

[0060] Figure 7 is a cross-sectional view of the liquid-cooled power module provided by the embodiments of the present application;

[0061] Figure 8 is Figure 7 a partial enlarged view of part M1 of the liquid-cooled power module in

[0062] Figure 9 is a schematic structural diagram of the heat dissipation plate provided by the embodiments of the present application;

[0063] Figure 10 It is another cross-sectional view of the liquid-cooled power module provided by an embodiment of the present application;

[0064] Figure 11 It is a schematic structural diagram of the power module provided by an embodiment of the present application;

[0065] Figure 12 It is an exploded view of the liquid-cooled power module provided by another embodiment of the present application;

[0066] Figure 13 It is a schematic structural diagram of the heat dissipation plate provided by another embodiment of the present application;

[0067] Figure 14 It is another schematic structural diagram of the heat dissipation plate provided by another embodiment of the present application;

[0068] Figure 15 is Figure 9 a partial enlarged view of the M2 part of the heat dissipation plate in

[0069] Figure 16 It is another cross-sectional view of the liquid-cooled power module provided by an embodiment of the present application. Detailed implementation manners

[0070] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0071] In order 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, and 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 dissipation plate. An inverter module includes three-phase bridge arms, and the three-phase bridge arms are used to receive power supply from the power battery of the electric vehicle and output three-phase current to drive the motor of the electric vehicle. The three-phase bridge arms include a plurality of power modules. A heat dissipation plate includes two sides, and the orientations of the two sides are opposite along the thickness direction of the heat dissipation plate. One side is used to fix a plurality of power modules of the three-phase bridge arms, and the other side is used to enclose another heat dissipation plate to form a liquid-cooled heat dissipation cavity. The other side includes a groove and a plurality of heat dissipation teeth. The recessed direction of the groove is towards a plurality of power modules of the three-phase bridge arms along the thickness direction of the heat dissipation plate. Each heat dissipation tooth extends from the bottom of the groove along the stacking direction of each power module and the heat dissipation plate, and the extension length of each of at least part of the heat dissipation teeth is greater than the depth of the groove. By using the other side to form a downwardly recessed groove and a plurality of downwardly sunken heat dissipation teeth, the heat dissipation teeth and the coolant flowing through the groove can have a larger contact area, improving the cooling efficiency of a heat dissipation plate for a plurality of power modules. The plurality of heat dissipation teeth extend from the bottom of the groove to reduce the thickness of the heat dissipation plate, improving the integration of a heat dissipation plate, and further improving the integration of the liquid-cooled power module, which is beneficial to the overall smaller volume of the liquid-cooled power module, beneficial to the miniaturized layout of the motor controller, and optimizing the overall vehicle layout.

[0072] The liquid-cooled power module provided by the embodiment of the present application is used for a motor controller, and the motor controller is applied to a powertrain, and the powertrain is applied to an electric vehicle to improve the overall performance of the electric vehicle.

[0073] Figure 1 It is a schematic structural diagram of an electric vehicle 1 provided by an embodiment of the present application. Figure 2 It is a schematic structural diagram of a powertrain 10 provided by an embodiment of the present application. Figure 3 It is a schematic structural diagram of a liquid-cooled power module 100 provided by an embodiment of the present application.

[0074] In one embodiment, the electric vehicle 1 includes a vehicle frame 20, a power battery 30 and a powertrain 10, as Figure 1 shown, the vehicle frame 20 is used to fix the power battery 30 and the powertrain 10. In the embodiment of the present application, the powertrain 10 is used to receive power supply from the power battery 30 and is used to drive the wheels 40.

[0075] In the embodiment of the present application, the power battery 30 can also be referred to as a battery pack or a battery.

[0076] In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device.

[0077] In one embodiment, the powertrain 10 includes a motor 11, a reducer 12, and a motor controller 13. As Figure 2 shown, in the embodiment of the present application, the motor 11 includes a motor shaft (not shown), a motor stator (not shown), and a motor rotor (not shown). The reducer 12 includes 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 for driving connection with the input shaft of the reducer 12. The input shaft receives the 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 needed and can be a single-stage reduction gear assembly, a two-stage or multi-stage reduction gear assembly. The motor rotor is fixedly sleeved on the motor shaft, and after receiving alternating current, the motor stator drives the motor rotor to rotate, thereby driving the motor shaft to rotate.

[0078] 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 the direct current delivered by the power battery 30 and convert the direct current into alternating current and deliver it to the motor 11. The power battery 30 drives the motor 11 by connecting to the winding of the motor 11 through the motor 11 control circuit, and the motor shaft of the motor 11 is in driving connection with the input shaft of the reducer 12.

[0079] In one embodiment, the motor controller 13 is further used for charging and discharging the battery. The motor controller 13 is further used for integrating at least one of an on-vehicle charger, a vehicle controller, and a power distribution device.

[0080] In one embodiment, as Figure 2 and Figure 3 shown, the motor controller 13 includes a housing (not shown) and a liquid-cooled power module 100. The housing is used to accommodate the liquid-cooled power module 100, and the motor 11 is used to receive the power supply from the liquid-cooled power module 100 of the motor controller 13. The liquid-cooled power module 100 includes a radiator and a power module. The radiator is used to cool the power module, and the power module is used to realize the conversion between alternating current and direct current.

[0081] In one embodiment, the motor controller 12 further includes components such as a DC filter, a bus capacitor, a Hall copper bar assembly, and a circuit board.

[0082] 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 radiator, etc. Each component is fixed to the housing of the motor controller one by one with screws. The large number of parts makes the volume of the motor controller 13 large, and the large number of parts also makes the assembly complex, difficult to rework and repair, resulting in a low integration degree of the motor controller.

[0083] In the embodiment of the present application, by using another side to form a downwardly recessed groove and multiple downwardly sunken heat dissipation teeth, the heat dissipation teeth and the coolant flowing through the groove can have a larger contact area, improving the cooling efficiency of one heat dissipation plate for multiple power modules. The multiple heat dissipation teeth extend from the bottom of the groove to reduce the thickness of the heat dissipation plate, and can also improve the integration degree of one heat dissipation plate, thereby facilitating the miniaturized layout of the liquid-cooled power module and reducing the assembly difficulty.

[0084] The liquid-cooled power module 100 provided for the motor controller 13 in the embodiment of the present application will be introduced in detail below.

[0085] Figure 4 It is an exploded view of the liquid-cooled power module 100 provided for the embodiment of the present application. Figure 5 It is another structural schematic diagram of the liquid-cooled power module 100 provided for the embodiment of the present application. Figure 6 It is a cross-sectional view of the heat dissipation plate 110 provided for the embodiment of the present application. Figure 7 It is a cross-sectional view of the liquid-cooled power module 100 provided for the embodiment of the present application. Figure 8 is Figure 7 A partial enlarged view of the M1 part of the liquid-cooled power module 100 in

[0086] In one embodiment, as Figures 1 to 3 shown, the liquid-cooled power module 100 includes an inverter module (not shown) and a heat dissipation plate 110. The inverter module includes three-phase bridge arms (not shown). The three-phase bridge arms are used 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 include multiple power modules 210. The heat dissipation plate 110 is used to circulate coolant to cool down the multiple power modules 210 of the three-phase bridge arms.

[0087] In one embodiment, the heat dissipation plate 110 includes two sides 110a and 110b. As Figures 3 to 5 shown, along the thickness direction Z of the heat dissipation plate 110, the orientations of the two sides 110a and 110b are opposite to each other. One side 110a is used to fix the multiple power modules 210 of the three-phase bridge arms, and the other side 110b is used to enclose another heat dissipation plate 310 to form a liquid-cooled heat dissipation cavity 101. The side 110b includes a groove 112 and multiple heat dissipation teeth 113. The depression direction Z of the groove 112 is along the thickness direction Z of the heat dissipation plate 110 and faces the multiple power modules 210 of the three-phase bridge arms. As Figure 6 and Figure 7 shown, each heat dissipation tooth 113 extends from the bottom of the groove 112 along the stacking direction Z of each power module 210 and the heat dissipation plate 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.

[0088] In the embodiment of the present application, the depression direction of a groove 112 is denoted as Z, the width direction of a heat dissipation plate 110 is denoted as Y, the length direction of a heat dissipation plate 110 is denoted as X, and the directions X, Y, and Z are perpendicular to each other pairwise. The depression direction Z of a groove 112 is the same as the thickness direction Z of a heat dissipation plate 110 and the stacking direction Z of the power module 210 and the heat dissipation plate 110.

[0089] In the embodiment of the present application, the heat dissipation plate 110 includes two side surfaces 110a and 110b. Along the thickness direction Z of the heat dissipation plate 110, the orientations of the two side surfaces 110a and 110b are opposite to each other, so that the side surface 110a of the heat dissipation plate 110 can be used to fix multiple power modules 210 of the three-phase bridge arm, and the side surface 110b can be used to form a groove 112 and multiple heat dissipation teeth 113, and the two side surfaces 110a and 110b do not interfere with each other. In one embodiment, the side surface 110a and multiple power modules 210 of the three-phase bridge arm are fixed by welding, which is beneficial to improving the structural strength and heat conduction efficiency of the liquid-cooled power module 100.

[0090] In the embodiment of the present application, the side surface 110a is used to fix multiple power modules 210 of the three-phase bridge arm, so that the heat dissipation plate 110 and the multiple power modules 210 have a large contact area, which is beneficial to the coolant in the liquid-cooled heat dissipation cavity 101 to dissipate heat from the multiple power modules 210 and ensure the normal operation of the motor controller 13.

[0091] In the embodiment of the present application, the side surface 110b is used to enclose the heat dissipation plate 310 to form a liquid-cooled heat dissipation cavity 101. The side surface 110b includes a groove 112 and multiple heat dissipation teeth 113. The groove 112 formed by the heat dissipation plate 110 with heat dissipation teeth 113 can allow the coolant to flow through, so that the contact area between the coolant and the multiple heat dissipation teeth 113 is larger, and thus the contact area between the heat dissipation plate 110 and the coolant is larger, enabling the heat dissipation plate 110 to have a larger heat dissipation space, which is beneficial to improving the cooling effect of the heat dissipation plate 110 on the multiple power modules 210. The side surface 110b includes a groove 112 and multiple 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 multiple heat dissipation teeth 113 of the heat dissipation plate 110 are arranged in a sunken manner along the depression 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 its thickness direction Z. The groove 112 formed by the heat dissipation plate 110 with heat dissipation teeth 113 can allow the coolant to flow through, and also makes the integration degree of the heat dissipation plate 110 and the multiple power modules 210 of the three-phase bridge arm higher, which is beneficial to the miniaturization of the liquid-cooled power module 100, and further beneficial to the miniaturized layout of the motor controller 13.

[0092] In the embodiment of the present application, the concave direction Z of the groove 112 is along the thickness direction Z of the heat sink 110 toward the multiple power modules 210 of the three-phase bridge arm, so that the groove bottom of the groove 112 is thinner, and even if the multiple 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 sink 110, the thickness of the heat sink 110 can be thinner, which is conducive to weight reduction and saving space on the heat sink 110 along its thickness direction Z. The concave direction Z of the groove 112 is along the thickness direction Z of the heat sink 110 toward the multiple power modules 210 of the three-phase bridge arm, and the coolant flowing in the groove 112 can also take away the heat of the multiple power modules 210 faster through the heat sink 110 with a thinner thickness, thereby improving the heat dissipation efficiency.

[0093] In the embodiment of the present application, each heat dissipation tooth 113 extends from the bottom of the groove 112 along the stacking direction Z of each power module 210 and the heat sink 110, so that the heat dissipation tooth 113 has a larger contact area with the coolant flowing in the liquid-cooled heat dissipation cavity 101, thereby increasing the heat dissipation area of the heat sink 110, which is beneficial to improving the heat dissipation efficiency of the heat sink 110 for the power module 210 and ensuring the safe operation of the liquid-cooled power module 100 in the motor controller 13.

[0094] In the embodiments of the present application, Figure 7 and Figure 8 As shown, the extension length of each of at least some of the heat dissipation teeth 113 is recorded as L1, and the depth of the groove 112 is recorded as L2, L1>L2, at least some of the heat dissipation teeth 113 refer to the heat dissipation teeth 113 whose extension length is greater than the depth of the groove 112, and at least some of the heat dissipation teeth 113 have a longer extension length, so that the heat dissipation teeth 113 can make full use of the space in the depth direction of the groove 112, and contact with the coolant as much as possible, forming a larger heat dissipation area, and improving the cooling effect of the heat dissipation plate 110 on the multiple power modules 210. If L1<L2, when the coolant flows in the groove 112, there is a gap between the tooth surface of the multiple heat dissipation teeth 113 and the heat dissipation plate 310, so that the coolant flows in the gap between the tooth surface and the heat dissipation plate 310, thereby reducing the stirring and turbulent effect of the heat dissipation teeth 113 on the coolant, resulting in a poor cooling effect. Only requiring L1>L2 for at least some of the heat dissipation teeth 113 can reduce the difficulty of processing the side 110b.

[0095] In one embodiment, the number of at least some of the heat dissipation teeth 113 accounts for more than 85% of the number of all the heat dissipation teeth 113 .

[0096] In one embodiment, without considering the processing error, the extension length of each heat dissipation tooth 113 among all the heat dissipation teeth 113 is greater than the depth of the groove 112 .

[0097] In one embodiment, the side surface 110a includes a protrusion 111, as Figure 3 , Figure 4 and Figure 7 shown, the protrusion 111 protrudes away from the side surface 110b along the depression direction Z of the groove 112. The protrusion 111 is used to fix a plurality of power modules 210, and the protrusion 111 is stacked on a plurality of heat dissipation teeth 113 along the depression direction Z of the groove 112.

[0098] In the embodiment of the present application, the side surface 110a includes a protrusion 111. The protrusion 111 protrudes away from the side surface 110b along the depression direction Z of the groove 112. The protrusion 111 is used to fix a 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 operation safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0099] In the embodiment of the present application, the protrusion 111 is stacked on a plurality of heat dissipation teeth 113 along the depression direction Z of the groove 112. Although the protrusion 111 will increase the thickness of the heat dissipation plate 110, the heat dissipation teeth 113 of the side surface 110b are recessed from the side surface 110b, so that the thickness of the region where the heat dissipation teeth 113 are located and the bottom of the groove 112 is small, and the overall thickness of the heat dissipation plate 110 will not become large. Furthermore, while reducing the electrical influence of the heat dissipation plate 110 on the plurality of power modules 210, the heat dissipation plate 110 can have a small thickness in its thickness direction Z. The protrusion 111 stacked on the heat dissipation teeth 113 along the depression direction Z of the groove 112 is also beneficial to shortening the distance between the flow channels between the plurality of heat dissipation teeth 113 and the power modules 210 fixed by the protrusion 111 along the depression direction Z of the groove 112, so that the coolant flowing between the plurality of heat dissipation teeth 113 can better dissipate heat from the plurality of power modules 210 fixed to the protrusion 111, improving the heat dissipation efficiency.

[0100] In one embodiment, along the depression direction Z of the groove 112, as Figure 7 and Figure 8 shown, the thickness of the protrusion 111 is less than or equal to the depth of the groove 112.

[0101] In the embodiment of the present application, as Figure 8 shown, along the depression direction Z of the groove 112, the thickness of the protrusion 111 is denoted as L3, and the depth of the groove 112 is L2, and L3 ≤ L2, so that the overall thickness of the heat dissipation plate 110 is small, which is beneficial to reducing the weight of the heat dissipation plate 110, and is also beneficial to making the overall volume of the liquid-cooled power module 100 small, and further beneficial to the miniaturized layout of the liquid-cooled power module 100 in the motor controller 13.

[0102] In one embodiment, along the recessed direction Z of the groove 112, as Figure 7 and Figure 8 shown, the thickness of the protrusion 111 is less than the extension length of each of at least some of the heat dissipation teeth 113.

[0103] In the embodiment of the present application, as Figure 8 shown, along the recessed direction Z of the groove 112, the thickness of the protrusion 111 is L3, and the extension length of each of at least some of the heat dissipation teeth 113 is L1, L3 < L1, and L1 is larger, so that the contact area between the coolant and the heat dissipation teeth 113 is larger, improving the cooling efficiency of the coolant for the heat dissipation teeth 113, thereby improving the heat dissipation effect of the heat dissipation teeth 113 on the power module 210 while reducing the overall thickness of the heat dissipation plate 110. In the embodiment of the present application, at least some of the heat dissipation teeth 113 refer to the heat dissipation teeth 113 whose extension length is greater than the depth of the groove 112.

[0104] In one embodiment, without considering the processing technology error, the thickness of the protrusion 111 is less than the extension length of each of all the heat dissipation teeth 113.

[0105] In one embodiment, along the recessed direction Z of the groove 112, as Figure 7 and Figure 8 shown, the thickness of the protrusion 111 is greater than or equal to 1 mm.

[0106] In the embodiment of the present application, along the recessed direction Z of the groove 112, the thickness of the protrusion 111 is L3, L3 ≥ 1 mm, so that there is a sufficiently large gap between the part of the side surface 110a other than the protrusion 111 and the multiple power modules 210 fixed to the protrusion 111, avoiding the electrical influence of the heat dissipation plate 110 on the multiple power modules 210, enabling the multiple power modules 210 to work normally, and improving the safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0107] Exemplarily, as Figure 8 shown, along the recessed direction Z of the groove 112, the thickness of the protrusion 111 is L3, L3 = 1 mm.

[0108] Exemplarily, as Figure 8 shown, along the recessed direction Z of the groove 112, the thickness of the protrusion 111 is L3, L3 = 1.2 mm.

[0109] Exemplarily, as Figure 8 shown, along the recessed direction Z of the groove 112, the thickness of the protrusion 111 is L3, L3 = 1.5 mm.

[0110] Figure 9 It is a schematic structural diagram of the heat dissipation plate 110 provided by the embodiment of the present application.

[0111] In one embodiment, as Figure 9 shown, the length of the heat dissipation plate 110 along its width direction Y is less than the length of the heat dissipation plate 110 along its length direction X. Among them, as Figure 7 shown, along the width direction Y of the heat dissipation plate 110, the width of the protrusion 111 is less than the width of the groove 112, 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 a power module 210 fixed thereto, and the width of the protrusion 111 is greater than half of the width of a power module 210 fixed thereto.

[0112] In the embodiment of the present application, as Figure 9 shown, the length of the heat dissipation plate 110 along its width direction Y is denoted as L4, and the length of the heat dissipation plate 110 along its length direction X is denoted as L5, L4 < L5, so that a plurality of power modules 210 can be arranged along the length direction X of the heat dissipation plate 110.

[0113] In the embodiment of the present application, as Figure 7 shown, along the width direction Y of the heat dissipation plate 110, the width of the protrusion 111 is denoted as L6, and the width of the groove 112 is denoted as L7, 0.5L7 < L6 < L7, so that the width of the protrusion 111 does not exceed the width of the groove 112, and the protrusion 111 does not occupy too much space of the heat dissipation plate 110 along its width direction Y, which is beneficial to the miniaturization of the heat dissipation plate 110. The width of the groove 112 is greater than the width of the protrusion 111, so that the flow channel between a plurality of heat dissipation teeth 113 in the groove 112 area can have a larger area for circulating the coolant, improving the heat dissipation effect of the flow channel between the plurality of heat dissipation teeth 113 on the power module 210. 0.5L7 < L6 < L7 also makes the part of the groove 112 other than the part overlapping with the protrusion 111 have a thinner thickness, which is beneficial to the weight reduction of the heat dissipation plate 110.

[0114] In the embodiment of the present application, as Figure 7As shown, 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 denoted as L8. The power module 210 includes a packaging part (not shown) and the transmission copper bars 211 and 212 exposed outside the packaging part. There are multiple switching tubes inside the packaging part, and the multiple switching tubes are used to realize the conversion between direct current and alternating current. The transmission copper bars 211 and 212 exposed outside the packaging part are 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. 0.5L8 < L6 < L8, so that when the protrusion 111 can stably fix multiple power modules 210, the part of the side 110a of the heat dissipation plate 110 other than the protrusion 111 along the width direction Y can have a larger interval from the power module 210, which is beneficial to avoiding the electrical influence of the heat dissipation plate 110 on the multiple power modules 210, enabling the multiple power modules 210 to work normally, and improving the operating safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0115] In the embodiment of the present application, 0.5L7 < L6 < L7, 0.5L8 < L6 < L8, which is beneficial for the coolant flowing in the groove 112 to absorb the heat generated by the multiple power modules 210 faster and cool down the multiple power modules 210.

[0116] Figure 10 This is another cross-sectional view of the liquid-cooled power module 100 provided by the embodiment of the present application.

[0117] In one embodiment, as Figure 10 shown, 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 of the length of the groove 112. The length of the protrusion 111 is less than the sum of the lengths of the multiple power modules 210 fixed thereto, and the length of the protrusion 111 is greater than half of the sum of the lengths of the multiple power modules 210 fixed thereto.

[0118] 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 denoted as L9, and the length of the groove 112 is denoted as L10. 0.5L10 < L9 < L10, so that the length of the protrusion 111 will not exceed the length of the groove 112, and the protrusion 111 will not occupy too much space of the heat dissipation plate 110 along its length direction X, which is beneficial to the miniaturization of the heat dissipation plate 110. The width of the groove 112 is greater than the width of the protrusion 111, so that the flow channel between the multiple heat dissipation teeth 113 in the groove 112 area can have a larger area for the coolant to flow through, improving the heat dissipation effect of the flow channel between the multiple heat dissipation teeth 113 on the power module 210. 0.5L10 < L9 < L10 also makes the part of the groove 112 other than the part laminated with the protrusion 111 have a thinner thickness, which is beneficial to the weight reduction of the heat dissipation plate 110.

[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, the length of one power module 210 is denoted as L11, and the sum of the lengths of multiple power modules 210 is denoted as L12, where L12 = 3L11, and 0.5L12 < L9 < L12. When the protrusion 111 can stably fix multiple power modules 210, the part of the side surface 110a of the heat dissipation plate 110 other than the protrusion 111 along the length direction X can have a larger gap from the power module 210, which is beneficial to avoiding the electrical influence of the heat dissipation plate 110 on multiple power modules 210, enabling multiple power modules 210 to work properly, and improving the operation safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0120] In the embodiment of the present application, 0.5L10 < L9 < L10 and 0.5L12 < L9 < L12 are beneficial for the coolant flowing between multiple heat dissipation teeth 113 in the groove 112 to absorb the heat generated by multiple power modules 210 faster and cool down multiple power modules 210.

[0121] Figure 11 It is a schematic structural diagram of the power module 210 provided by the embodiment of the present application.

[0122] In one embodiment, as Figure 5 and Figure 11 shown, multiple power modules 210 are arranged at intervals along the length direction X of the heat dissipation plate 110. Each power module 210 includes two groups of transmission copper bars 211 and 212, and the two groups of transmission copper bars 211 and 212 are arranged opposite to each other along the width direction Y of the heat dissipation plate 110. Among them, as Figure 7 shown, along the width direction Y of the heat dissipation plate 110, the distance between the two groups of transmission copper bars 211 and 212 of one power module 210 is greater than the width of the protrusion 111 fixed thereto. Along the depression direction Z of the groove 112, each group of transmission copper bars has a gap 115 from the side surface 110a, and at least part of the side surface 110a is exposed in the gap 115. As Figure 7 and Figure 8 shown, along the depression direction Z of the groove 112, the gap 115 is greater than or equal to the thickness of the protrusion 111.

[0123] In the embodiment of the present application, multiple power modules 210 are arranged at intervals along the length direction X of the heat dissipation plate 110, enabling multiple power modules 210 to work relatively independently without interference. As Figure 2 and Figure 11As shown, each power module 210 includes two sets of transmission copper bars 211 and 212. After the transmission copper bar 211 of the power module 210 receives the direct current supplied by the power battery 30, it converts the direct current into alternating current and outputs it to the motor 11 through the transmission copper bar 212. The two sets of transmission copper bars 211 and 212 are arranged oppositely along the width direction Y of the heat dissipation plate 110, which is beneficial to the circuit layout in the motor controller 13 and also beneficial to the current of the power battery 30 driving the motor 11 to operate more smoothly.

[0124] In the embodiment of the present application, as Figure 7 and Figure 8 shown, along the width direction Y of the heat dissipation plate 110, the distance between the two sets of transmission copper bars 211 and 212 of a power module 210 is denoted as L13. L13 refers to the distance between the copper bar parts of the two sets of transmission copper bars 211 and 212 that are exposed outside the encapsulation part of the power module 210. The exposed transmission copper bars 211 and 212 need to consider electrical safety. Among them, the width of the protrusion 111 is L6, and L13 > L6, so that along the width direction Y of the heat dissipation plate 110, the two sets of transmission copper bars 211 and 212 of the power module 210 can have a large interval from the part of the side surface 110a other than the protrusion 111. The protrusion 111 fixes the power module 210 further away from the side surface 110a, so that it is not necessary to paste an insulating film on the side surface 110a, which can reduce costs and also ensure compliance with safety regulations.

[0125] In the embodiment of the present application, along the depression direction Z of the groove 112, each set of transmission copper bars has a gap 115 with the side surface 110a, and at least part of the side surface 110a is exposed in the gap 115, so that each set of transmission copper bars of the power module 210 can avoid electrical interference with the side surface 110a through the gap 115, and it is also possible to achieve electrical safety without pasting an insulating film on the side surface 110a, reducing production costs.

[0126] In the embodiment of the present application, as Figure 7 and Figure 8As shown, the width of the gap 115 in the depression direction Z of the groove 112 is denoted as L14, the thickness of the protrusion 111 is L3, and L14 ≥ L3. Since L14 is relatively large, the part of the side surface 110a opposite to the transmission copper bars 211 and 212 can have a larger interval from the transmission copper bars 211 and 212 of the power module 210, which is more conducive to achieving electrical interference between the side surface 110a and the transmission copper bars 211 and 212 of the power module 210, ensuring the electrical safety distance between the power module 210 and the side surface 110a, and facilitating the smooth operation of the power module 210. In one embodiment, the heat dissipation plate 110 is generally a metal plate. The metal heat dissipation plate 110 has better heat dissipation efficiency, but the metal heat dissipation plate 110 will affect the stability of the electrical transmission of the transmission copper bars 211 and 212 of the power module 210. In the embodiment of the present application, the transmission copper bars 211 and 212 of the power module 210 are separated from the side surface 110a of the heat dissipation plate 110 through the protrusion 111 to ensure the stability of the electrical transmission of the transmission copper bars 211 and 212 of the power module 210. By sinking multiple heat dissipation teeth 113 towards the protrusion 111 to make up for the increased thickness caused by the protrusion 111, the overall thickness of the liquid-cooled power module 100 can be ensured not to increase while ensuring electrical safety. The concave groove 112 and the sunken multiple heat dissipation teeth 113 can also increase the contact area with the coolant, improve the heat dissipation effect of the liquid-cooled power module 100, and thus improve the power of the liquid-cooled power module 100.

[0127] In one embodiment, as Figure 7 and Figure 8 shown, along the depression 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 some of the heat dissipation teeth 113.

[0128] In the embodiment of the present application, along the depression 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 some of the heat dissipation teeth 113 is L1. L14 ≥ L2 and L14 < L1, so that the size of the gap 115 is small. While ensuring that the gap 115 realizes the safety distance for electrical isolation between the heat dissipation plate 110 and the multiple power modules 210, the overall thickness of the heat dissipation plate 110 is not increased too much, which is beneficial for the liquid-cooled power module 100 to occupy less space along the groove 112 direction of the groove 112, and is beneficial for the miniaturized layout of the liquid-cooled power module 100 in the motor controller 13. In the embodiment of the present application, at least some of the heat dissipation teeth 113 refer to the heat dissipation teeth 113 whose extension length is greater than the depth of the groove 112.

[0129] In one embodiment, the heat dissipation plate 110 further includes a plurality of fixing protrusions 120, as Figures 3 to 5As shown, a plurality of fixing protrusions 120 are used to fix the heat dissipation plate 310. Among them, along the width direction Y of the heat dissipation plate 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 dissipation plate 110, each fixing protrusion 120 is spaced from the transmission copper bars 211 and 212 of an adjacent power module 210. As Figure 7 and Figure 8 shown, along the depression 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 some of the heat dissipation teeth 113.

[0130] In the embodiment of the present application, the heat dissipation plate 110 further includes a plurality of fixing protrusions 120 for fixing the heat dissipation plate 310. The heat dissipation plate 310 is used to enclose a liquid-cooled heat dissipation cavity 101 with the side surface 110b. The plurality of fixing protrusions 120 contribute to making the structure of the liquid-cooled heat dissipation cavity 101 more stable.

[0131] In the embodiment of the present application, since the groove 112 is formed on the side surface 110b of the heat dissipation plate 110, the structural strength of the heat dissipation plate 110 is reduced. By providing a plurality of fixing protrusions 120, and along the width direction Y of the heat dissipation plate 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 dissipation plate 110 is enhanced. Along the width direction Y of the heat dissipation plate 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 can also ensure that there is a sufficient large interval between the plurality of fixing protrusions 120 and the two groups of transmission copper bars 211 and 212 of the plurality of power modules 210 along the depression direction Z of the groove 112 to ensure electrical safety.

[0132] In the embodiment of the present application, along the length direction X of the heat dissipation plate 110, each fixing protrusion 120 is spaced from the transmission copper bar of an adjacent power module 210, so that the fixing protrusion 120 and the power module 210 have a safe electrical distance, which is conducive to ensuring the normal operation of the liquid-cooled power module 100.

[0133] In the embodiment of the present application, as Figure 8As shown, along the recessed direction Z of the groove 112, the thickness of each fixing protrusion 120 is denoted as L15, the depth of the groove 112 is L2, and the extension length of each of at least some of the heat dissipation teeth 113 is L1. L15 > L2 and L15 ≤ L1, such that when the fixing protrusion 120 strengthens the strength of the groove 112, the thickness of the fixing protrusion 120 will not be too thick, which is beneficial to reducing the weight of the heat dissipation plate 110. Also, when forming the liquid cooling cavity 101 between the heat dissipation plate 310 and the side surface 110b, the space occupied by the heat dissipation plates 110 and 310 in the recessed direction Z of the groove 112 is small. In the embodiment of the present application, at least some of the heat dissipation teeth 113 refer to the heat dissipation teeth 113 with an extension length greater than the depth of the groove 112.

[0134] Figure 12 The explosion diagram of the liquid cooling power module 100 provided by another embodiment of the present application Figure 13 The structural schematic diagram of the heat dissipation plate 110 provided by another embodiment of the present application.

[0135] In one embodiment, the protrusion 111 includes three sub - protrusions 1110, as Figure 12 shown. The three sub - protrusions 1110 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. Among them, as Figure 10 and Figure 13 shown, 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 Figure 9 and Figure 13 shown, the maximum distance between two heat dissipation teeth 113 is greater than the sum of the lengths of the three sub - protrusions 1110. As Figure 13 shown, the distance between two adjacent sub - protrusions 1110 is less than the length of each sub - protrusion 1110.

[0136] In the embodiment of the present application, the protrusion 111 includes three sub - protrusions 1110. The three sub - protrusions 1110 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, such that more parts of the groove 112 along the thickness direction Z of the heat dissipation plate 110 have a thinner thickness, which is beneficial to reducing the weight of the heat dissipation plate 110. Also, it is beneficial for the coolant flowing in the groove 112 to absorb the heat of the power module 210 faster, improving the cooling efficiency.

[0137] In the embodiment of the present application, as Figure 10 and Figure 13 shown, 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 denoted as L16, and the sum of the lengths of the three sub - protrusions 1110 is denoted as L17, L17 = 3L16. As Figure 9As shown, the maximum distance between the two heat dissipation teeth 113 is denoted as L18, and L10 > L17, such that the lengths of the three sub-protrusions 1110 do not exceed the length of the groove 112. The three sub-protrusions 1110 do not overly occupy the space of the heat dissipation plate 110 along its length direction X, which is beneficial to the miniaturization of the heat dissipation plate 110. L10 > L17 and L18 > L17, such that the surfaces of the three power modules 210 fixed to the three sub-protrusions 1110 can all be flowed through by the coolant flowing in the groove 112, which is beneficial to the coolant cooling and temperature reduction of the power module 210 and improves the cooling efficiency of the heat dissipation plate 110.

[0138] In the embodiment of the present application, as Figure 13 shown, the distance between two adjacent sub-protrusions 1110 is denoted as L19, and L19 < L16, such that each sub-protrusion 1110 has a sufficiently large space to fix the power module 210, and it is also beneficial to arrange more sub-protrusions 1110 on the side surface 110a. L19 < L16 can also ensure that the three sub-protrusions 1110 do not overly occupy the space of the heat dissipation plate 110 along its length direction X, which is beneficial to the miniaturized layout of the liquid-cooled power module 100.

[0139] Figure 14 It is another schematic structural diagram of the heat dissipation plate 110 provided by another embodiment of the present application.

[0140] In one embodiment, the groove 112 includes three sub-grooves 1120, as Figure 12 and Figure 14 shown. 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 and one sub-protrusion 1110 are stacked along the depression 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.

[0141] In the embodiment of the present application, the three sub-grooves 1120 can form three parallel or series coolant flow channels on the side surface 110b. One sub-groove 1120 and one sub-protrusion 1110 are stacked along the depression direction Z of the groove 112, enabling the coolant to cool and reduce the temperature of the three power modules 210 simultaneously and respectively, which is beneficial to improving the cooling efficiency of the heat dissipation plate 110.

[0142] In the embodiment of the present application, along the length direction X of the heat dissipation plate 110, the length of a sub-groove 1120 is greater than the length of a sub-protrusion 1110 stacked therewith, so that the length of a sub-protrusion 1110 does not exceed the length of a sub-groove 1120, and a sub-protrusion 1110 does not overly occupy the space of the heat dissipation plate 110 along its length direction X, which is beneficial to the miniaturization of the heat dissipation plate 110. It also makes the part of a sub-groove 1120 other than the part stacked with a sub-protrusion 1110 have a thinner thickness, which is beneficial to the weight reduction of the heat dissipation plate 110.

[0143] In the embodiment of the present application, along the width direction Y of the heat dissipation plate 110, the width of a sub-groove 1120 is greater than the width of a sub-protrusion 1110 stacked therewith, so that when a sub-protrusion 1110 can stably fix a power module 210, the part of the side surface 110a of the heat dissipation plate 110 along the width direction Y other than a sub-protrusion 1110 can have a larger interval from the power module 210, which is beneficial to avoiding the electrical influence of the heat dissipation plate 110 on multiple power modules 210, enabling the multiple power modules 210 to work properly, and improving the operation safety performance of the liquid-cooled power module 100 in the motor controller 13.

[0144] In one embodiment, as Figure 12 and Figure 14 shown, along the depression direction Z of the groove 112, the center of each sub-protrusion 1110 is aligned with the center of a power module 210.

[0145] In the embodiment of the present application, the center of each sub-protrusion 1110 is aligned with the center of a power module 210, so that each sub-protrusion 1110 can more firmly fix a power module 210, and it can also make the coolant in a sub-groove 1120 stacked with a sub-protrusion 1110 better cool a power module 210, which is beneficial to improving the cooling efficiency. The alignment of the center of each sub-protrusion 1110 with the center of a power module 210 can also make the liquid-cooled power module 100 arranged regularly, and make the liquid-cooled power module 100 occupy less space along the length direction X and width direction Y of the heat dissipation plate 110.

[0146] Figure 15 For Figure 9 a partial enlarged view of the M2 part of the heat dissipation plate 110 in

[0147] In one embodiment, as Figure 9 and Figure 15 shown, the distance between the peripheral side wall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is smaller than the distance between every two adjacent heat dissipation teeth 113.

[0148] In the embodiment of the present application, as Figure 15As shown, for example, one heat dissipation tooth 113 adjacent to the circumferential sidewall 112a is denoted as heat dissipation tooth 113a, and two adjacent heat dissipation teeth 113 are respectively denoted as 113b and 113c. Since in the embodiment of the present application, in order to sink multiple heat dissipation teeth 113 towards multiple power modules 210, a groove 112 is formed, such that there is a gap between the circumferential sidewall 112a of the groove 112 and the heat dissipation tooth 113a, and this gap can allow the coolant to flow through. In the embodiment of the present application, the distance between the circumferential sidewall 112a of the groove 112 and the heat dissipation tooth 113a is smaller than the distance between two adjacent heat dissipation teeth 113. And the larger the distance, the smaller the resistance to the flow of the coolant. When the coolant flows into the liquid cooling cavity 101 of the heat dissipation plate 110, it can avoid the coolant bypassing through the circumferential sidewall 112a of the groove 112, and more of it flows between the heat dissipation teeth 113, prolonging the residence time of the coolant in the heat dissipation plate 110, increasing the agitation of the coolant by the heat dissipation teeth 113, and also being conducive to the coolant having a larger cooling area with the heat dissipation teeth 113, so that the cooling effect of the heat dissipation plate 110 on the multiple power modules 210 is improved.

[0149] In one embodiment, as Figure 9 、 Figure 10 and Figure 15 shown, the distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is less than or equal to 0.5 mm.

[0150] In the embodiment of the present application, the distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is less than or equal to 0.5 mm. The distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is relatively small, such that the coolant can flow more between the heat dissipation teeth 113, prolonging the residence time of the coolant in the heat dissipation plate 110, the agitation of the coolant by the heat dissipation teeth 113, and also being conducive to the coolant having a larger cooling area with the heat dissipation teeth 113, so that the cooling effect of the heat dissipation plate 110 on the multiple power modules 210 is improved.

[0151] For example, the distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is 0, and each heat dissipation tooth 113 adjacent to the circumferential sidewall 112a of the groove 112 is directly attached to the circumferential sidewall 112a, such that all the coolant flows through between the heat dissipation teeth 113, further improving the cooling effect.

[0152] For example, the distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is 0.2 mm.

[0153] For example, the distance between the circumferential sidewall 112a of the groove 112 and each adjacent heat dissipation tooth 113 is 0.5 mm.

[0154] Figure 16It is another cross-sectional view of the liquid-cooled power module 100 provided by the embodiments of the present application.

[0155] In one embodiment, as Figure 5 , Figure 9 and Figure 16 shown, the side surface 110b further includes a sealing groove 114. The sealing groove 114 surrounds the groove 112. The sealing groove 114 is used to accommodate a sealing ring 114a. The sealing ring 114a is used to seal the liquid-cooling heat dissipation cavity 101 formed by the side surface 110b of the heat dissipation plate 110 and the heat dissipation plate 310. Wherein, along the depression 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.

[0156] In the embodiments of the present application, the side surface 110b further includes a sealing groove 114. The sealing groove 114 surrounds the groove 112. The peripheral side wall 112a of the groove 112 has a relatively large thickness. The sealing groove 114 is arranged on the periphery of the groove 112, which has less influence on the structural strength of the heat dissipation plate 110. It also enables a sealing ring 114a accommodated in the sealing groove 114 to seal the groove 112 comprehensively along the circumferential direction of the groove 112, which is beneficial to improving the sealing effect and preventing the coolant in the liquid-cooling heat dissipation cavity 101 from leaking and affecting the electrical components in the motor controller 13.

[0157] In the embodiments of the present application, along the depression 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 heat dissipation 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 will not affect the overall structural strength of the heat dissipation plate 110, which is beneficial to ensuring the structural stability of the heat dissipation plate 110.

[0158] The liquid-cooled power module, motor controller, powertrain and electric vehicle for the motor controller provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in specific embodiments and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A liquid-cooled power module for a motor controller, characterized in that, 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, the inverter module includes three-phase bridge arms, the three-phase bridge arms are used to receive power supply from the power battery of the electric vehicle and output three-phase current to drive the motor of the electric vehicle, and the three-phase bridge arms include a plurality of power modules; A heat dissipation plate, the heat dissipation plate includes two sides, the orientations of the two sides are opposite along the thickness direction of the heat dissipation plate, one side is used to fix the plurality of power modules of the three-phase bridge arms, and the other side is used to enclose another heat dissipation plate to form a liquid-cooled heat dissipation cavity. The other side includes a groove and a plurality of heat dissipation teeth. The depression direction of the groove is along the thickness direction of the heat dissipation plate towards the plurality of power modules of the three-phase bridge arms. Each heat dissipation tooth extends from the bottom of the groove along the stacking direction of each power module and the heat dissipation plate, and the extension length of at least part of each of the plurality of heat dissipation teeth is greater than the depth of the groove.

2. The liquid-cooled power module according to claim 1, characterized in that, One side includes a protrusion, the protrusion protrudes away from the other side along the depression direction of the groove, and the protrusion is used to fix the plurality of power modules, and the protrusion is stacked on the plurality of heat dissipation teeth along the depression direction of the groove.

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

4. The liquid-cooled power module according to claim 2, wherein Along the depression direction 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.

5. The liquid-cooled power module according to claim 3, wherein Along the depression direction 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.

6. The liquid-cooled power module according to claim 2, wherein, Along the depression direction of the groove, the thickness of the protrusion is greater than or equal to 1 mm.

7. The liquid-cooled power module according to any one of claims 2-6, characterized in that, The length of the heat dissipation plate along its width direction is less than the length of the heat dissipation plate along its length direction, where: Along the width direction of the heat dissipation plate, the width of the protrusion is less than the width of the groove, and the width of the protrusion is greater than half of the width of the groove; the width of the protrusion is less than the width of a power module fixed thereto, and the width of the protrusion is greater than half of the width of a power module fixed thereto; Along the length direction of the heat dissipation plate, the length of the protrusion is less than the length of the groove, and the length of the protrusion is greater than half of 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 of the sum of the lengths of the plurality of power modules fixed thereto.

8. The liquid-cooled power module according to any one of claims 2-6, characterized in that, The plurality of power modules are arranged at intervals along the length direction of the heat dissipation plate. Each power module includes two groups of transmission copper bars, and the two groups of transmission copper bars are arranged opposite to each other along the width direction of the heat dissipation plate. 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, where: In the width direction of the one heat dissipation plate, the distance between the two sets of transmission copper bars of the one power module is greater than the width of the one protrusion fixed thereto; In the recessed direction of the one groove, each set of the transmission copper bars has a gap with the one side surface, and at least a part of the one side surface is exposed in the gap; In the recessed direction of the one groove, the gap is greater than or equal to the thickness of the one protrusion.

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

10. The liquid-cooled power module according to any one of claims 2-6 and 9, characterized in that, The one heat dissipation plate further includes a plurality of fixing protrusions for fixing the other heat dissipation plate. The length of the one heat dissipation plate in its length direction is greater than the length of the one heat dissipation plate in its width direction, wherein: In the width direction of the one heat dissipation plate, each of the fixing protrusions faces away from the one groove protrusion, and the plurality of fixing protrusions are distributed on both sides of the one groove; In the length direction of the one heat dissipation plate, each of the fixing protrusions is spaced from the transmission copper bar of one power module adjacent thereto; In the recessed direction of the one groove, the thickness of each of the fixing protrusions is greater than the depth of the one groove, 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.

11. The liquid-cooled power module according to any one of claims 2-6 and 9, characterized in that, The one protrusion includes three sub-protrusions, and the three sub-protrusions are arranged at intervals in the length direction of the one heat dissipation plate. Each of the sub-protrusions is used to fix one power module, wherein: In the length direction of the one heat dissipation plate, the length of the one groove is greater than the sum of the lengths of the three sub-protrusions, the maximum distance between the 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 sub-protrusion.

12. The liquid-cooled power module according to any one of claims 1-6, characterized in that, The distance between the peripheral side wall of the one groove and each of the adjacent heat dissipation teeth is less than the distance between every two adjacent heat dissipation teeth.

13. The liquid-cooled power module according to claim 7, wherein The distance between the peripheral side wall of the one groove and each of the adjacent heat dissipation teeth is less than the distance between every two adjacent heat dissipation teeth.

14. The liquid-cooled power module according to claim 8, wherein, The distance between the peripheral side wall of the one groove and each of the adjacent heat dissipation teeth is less than the distance between every two adjacent heat dissipation teeth.

15. The liquid-cooled power module according to claim 10, characterized in that, The distance between the peripheral side wall of the one groove and each of the adjacent heat dissipation teeth is less than the distance between every two adjacent heat dissipation teeth.

16. The liquid-cooled power module according to claim 11, wherein The distance between the peripheral side wall of the one groove and each of the adjacent heat dissipation teeth is less than the distance between every two adjacent heat dissipation teeth.

17. The liquid-cooled power module according to any one of claims 1-6, 13-16, characterized in that, The other side surface further includes a sealing groove surrounding the one groove. The one sealing groove is used to accommodate a sealing ring, and the one sealing ring is used to seal the liquid cooling heat dissipation cavity formed by the other side surface of the one heat dissipation plate and the other heat dissipation plate, wherein: In the recessed direction of the one groove, the one sealing groove is recessed towards the one side surface, and the depth of the one sealing groove is less than or equal to the groove depth of the one groove.

18. The liquid-cooled power module according to claim 12, wherein The other side further includes a sealing groove, the sealing groove surrounds the groove, the sealing groove is used to accommodate a sealing ring, and the sealing ring is used to seal the other side of the heat dissipation plate and the liquid cooling heat dissipation cavity formed by the other heat dissipation plate, where: Along the recessed direction of the groove, the sealing groove is recessed towards the side, and the depth of the sealing groove is less than or equal to the groove depth of the groove.

19. A motor controller, characterized in that, The motor controller includes a housing and the liquid cooling power module according to any one of claims 1-18. The housing is used to accommodate the liquid cooling power module, and the internal flow channel of the housing is used to communicate with the liquid cooling heat dissipation cavity in the liquid cooling power module.

20. A powertrain, characterized in that, The powertrain includes a motor and the motor controller according to claim 19. The motor is used to receive power supply from the liquid cooling power module of the motor controller.

21. An electric vehicle, characterized in that, The electric vehicle includes a frame, a power battery, and the powertrain according to claim 20. The frame is used to fix the power battery and the powertrain. The motor of the powertrain is used to receive power supply from the power battery through the motor controller to drive the wheels.

Images