Dual-motor controller with parallel water channel design, power assembly and electric vehicle

Abstract

The utility model provides a dual-motor controller with a parallel water channel design, a distributed power assembly and an electric vehicle. The dual-motor controller comprises two power modules, two power module radiators and a dual-motor controller shell. Wherein the two power module radiators are respectively used for cooling the two power modules, and the dual-motor controller shell is used for accommodating the two power modules and the two power module radiators. The dual-motor controller shell comprises two water inlets, two water outlets, a first group of flow channels and a second group of flow channels; the first group of flow channels are used for communicating one of the two water inlets, one power module radiator and one of the two water outlets; and the second group of flow channels are used for communicating the other water inlet of the two water inlets, the other power module radiator and the other water outlet of the two water outlets. According to the dual-motor controller provided by the invention, the cooling structure design can be improved and simplified, and the cooling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a double-motor controller with parallel water channel design, a distributed power assembly and a vehicle. BACKGROUND

[0002] With the development of the electric vehicle industry, the distributed power assembly has advantages of high efficiency, small size, low weight and high power density, and gradually becomes the mainstream direction of electric drive system design. The distributed power assembly includes a double-motor controller and two motors, and the double-motor controller includes two power modules, which are used to drive the two motors respectively. In the operation process of the double-motor controller, the two power modules generate a large amount of heat, and therefore the cooling and heat dissipation problem of the double-motor controller needs to be solved urgently. However, the current double-motor controller cooling scheme has problems of low cooling efficiency and complex structure. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a double-motor controller with parallel water channel design, a power assembly and a vehicle, which are used to simplify the cooling structure of the double-motor controller and improve the cooling and heat dissipation efficiency of the double-motor controller.

[0004] In a first aspect, the present application provides a double-motor controller with parallel water channel design. The double-motor controller includes two power modules, two power module radiators and a double-motor controller housing. Each of the two power modules includes a three-phase bridge arm, and the three-phase bridge arm of each power module is used to drive a motor. Each of the two power module radiators is used to receive cooling liquid through an inlet hole and cool one of the two power modules. The double-motor controller housing is used to accommodate the two power modules and the two power module radiators, one side of the double-motor controller housing includes two water inlets, and the other side of the double-motor controller housing opposite to the one side includes two water outlets. The double-motor controller housing includes a first group of flow channels and a second group of flow channels. The first group of flow channels is used to connect one of the two water inlets, one of the power module radiators and one of the two water outlets. The second group of flow channels is used to connect the other of the two water inlets, the other of the power module radiators and the other of the two water outlets.

[0005] The double-motor controller with parallel water channel provided by the present application is provided with two groups of parallel flow channels, the first group of flow channels is used to cool one power module through one power module radiator, and the second group of flow channels is used to cool the other power module through the other power module radiator. Compared with the scheme of cooling two power modules through one group of connected serial water channels, the parallel water channel cooling scheme provided by the present application has the following beneficial effects:

[0006] First, compared with the cooling structure of the series water channels shown, the first group of flow channels and the second group of flow channels have shorter flow channel lengths and smaller flow resistances, and the coolant in the flow channels has a better cooling effect on the power module.

[0007] Secondly, in a cooling structure with series water channels, after the coolant flows upstream to cool the upstream power module, the coolant absorbs heat and its temperature rises, resulting in a small temperature difference between the coolant and the downstream power module when the coolant flows downstream, and a poor cooling effect. In contrast, in the parallel water channel cooling structure provided by this application, the first and second groups of flow channels each cool two power modules separately. The temperature difference between the coolant in the first group of flow channels and one power module is large, and the temperature difference between the coolant in the second group of flow channels and another power module is large, resulting in a higher heat transfer efficiency between the coolant and the two power modules.

[0008] In one embodiment of the first aspect, the dual-motor controller housing includes a base plate, the base plate includes a first group of flow channel grooves and a second group of flow channel grooves, the first group of flow channel grooves are recessed from the lower surface of the base plate toward the two power modules along a third direction, and the first group of flow channel grooves are used to form a first group of flow channels.

[0009] The second group of flow channel grooves is recessed from the lower surface of the bottom plate toward the two power modules along the third direction, and the second group of flow channel grooves is used to form a second group of flow channels.

[0010] The first and second sets of flow channels provided in this application are disposed on the base plate, fully utilizing the base plate's structure and materials, thereby saving space and improving the structural integration of the dual-motor controller. Furthermore, because the first and second sets of flow channels are formed by inwardly recessing the outer surface of the dual-motor controller housing, the two sets of flow channels and the components within the dual-motor controller housing are isolated from each other, thereby improving the insulation safety of the dual-motor controller.

[0011] In one embodiment of the first aspect, the two water inlets are arranged along a first direction, the two water outlets are arranged along the first direction, the two power modules are arranged along the first direction, and the two power module heat sinks are arranged along the first direction. The base plate and the two power module heat sinks are stacked along a third direction. The third direction is perpendicular to the first direction.

[0012] In an embodiment of the first aspect, the two power module heat sinks include a first power module heat sink and a second power module heat sink, the first power module heat sink includes a first liquid inlet hole and a first liquid outlet hole, and the second power module heat sink includes a second liquid inlet hole and a second liquid outlet hole. The first set of flow channels includes a first liquid inlet flow channel and a first liquid outlet flow channel, the first liquid inlet flow channel is configured to connect the one water inlet to the first liquid inlet hole, and the first liquid outlet flow channel is configured to connect the first liquid outlet hole to the one water outlet. The second set of flow channels includes a second liquid inlet flow channel and a second liquid outlet flow channel, the second liquid inlet flow channel is configured to connect the other water inlet to the second liquid inlet hole, and the second liquid outlet flow channel is configured to connect the second liquid outlet hole to the other water outlet.

[0013] In an embodiment of the first aspect, the distance between the two water inlets and the bottom plate is greater than the distance between the two water outlets and the bottom plate. That is, in the third direction, the height of the two water inlets is greater than the height of the two water outlets, and a difference is formed between the two water inlets and the two water outlets, so that the gravitational potential energy can be used to make the cooling liquid flow from the two water inlets to the two water outlets through the two sets of flow channels, thereby improving the flow efficiency of the cooling liquid.

[0014] In an embodiment of the first aspect, the distance between the two water outlets is greater than the distance between the two water inlets. By setting the distance between the two water outlets to be greater than the distance between the two water inlets, the two water outlets can be closer to the liquid outlet holes of the two power module heat sinks, and the two water inlets can be closer to the liquid inlet holes of the two power module heat sinks. In this way, the length of the flow channels can be reduced, and the cooling structure can be simplified.

[0015] In an embodiment of the first aspect, the flow direction of the cooling liquid in the first power module heat sink is the same as the flow direction of the cooling liquid in the second power module heat sink, and the orientations of the three-phase output terminals of the first power module and the second power module are consistent.

[0016] The flow direction of the cooling liquid in the first power module heat sink is the same as the flow direction of the cooling liquid in the second power module heat sink, that is, the direction from the first liquid inlet hole to the first liquid outlet hole of the first power module heat sink is the same as the direction from the second liquid inlet hole to the second liquid outlet hole of the second power module heat sink, or the first power module and the second power module are installed in a translation manner. The advantage of this installation manner is that the orientations of the three-phase output terminals of the two power modules are consistent, thereby making the connection between the two motors and the two power modules more convenient.

[0017] In one embodiment of the first aspect, the first liquid inlet channel comprises a first section and a second section perpendicular to each other, the first section of the first liquid inlet channel is configured to communicate with one water inlet and one end of the second section of the first liquid inlet channel, the other end of the second section of the first liquid inlet channel is configured to communicate with the first liquid inlet, and the length of the first section of the first liquid inlet channel is greater than the length of the second section of the first liquid inlet channel.

[0018] In one embodiment of the first aspect, the first liquid outlet channel comprises a first section and a second section perpendicular to each other, the first section of the first liquid outlet channel is configured to communicate with one water outlet and one end of the second section of the first liquid outlet channel, the other end of the second section of the first liquid outlet channel is configured to communicate with the first liquid outlet, and the length of the first section of the first liquid outlet channel is greater than the length of the second section of the first liquid outlet channel.

[0019] In one embodiment of the first aspect, the second liquid inlet channel comprises a first section, a second section and a third section connected in sequence, the first section of the second liquid inlet channel is configured to communicate with another water inlet and one end of the second section of the second liquid inlet channel, the third section of the second liquid inlet channel is configured to communicate with the second liquid inlet and the other end of the second section of the second liquid inlet channel, and the angle between the first section of the second liquid inlet channel and the second section of the second liquid inlet channel and the angle between the second section of the second liquid inlet channel and the third section of the second liquid inlet channel are obtuse angles.

[0020] In one embodiment of the first aspect, the second liquid outlet channel comprises a first section, a second section and a third section connected in sequence, the first section of the second liquid outlet channel is configured to communicate with another water outlet and one end of the second section of the second liquid outlet channel, the third section of the second liquid outlet channel is configured to communicate with the second liquid outlet and the other end of the second section of the second liquid outlet channel, and the angle between the first section of the second liquid outlet channel and the second section of the second liquid outlet channel and the angle between the second section of the second liquid outlet channel and the third section of the second liquid outlet channel are obtuse angles.

[0021] The first group of flow channels communicates the first water inlet and the first water outlet, and the second group of flow channels communicates the second water inlet and the second water outlet. When the two power modules are arranged in translation, the length of the first group of flow channels is less than the length of the second group of flow channels, which will cause the pressure drop of the cooling liquid in the first group of flow channels to be less than the pressure drop of the cooling liquid in the second group of flow channels. In order to balance the pressure drop of the cooling liquid in the first group of flow channels and the pressure drop of the cooling liquid in the second group of flow channels, in the embodiment of the present application, the angles between the two sections of the first liquid inlet flow channel and the first liquid outlet flow channel are both right angles, and the angles between the three sections of the second liquid inlet flow channel and the second liquid outlet flow channel are obtuse angles. For example, the angles between the first section and the second section and the angles between the second section and the third section of the second liquid inlet flow channel are both obtuse angles. Compared with the design of right angles, the obtuse angle design of the flow channel can effectively reduce the flow resistance and pressure drop of the cooling liquid in the flow channel. That is, when the two power modules are arranged in translation, the first group of flow channels is a short-path right-angle flow channel, and the second group of flow channels is a long-path obtuse-angle flow channel. Through the balance design between the length and the angle of the two groups of flow channels, the pressure drops of the two groups of flow channels can be balanced, so that the pressures of the two groups of flow channels at the water outlet can be equivalent.

[0022] In an embodiment of the first aspect, the length of the second section of the second liquid inlet flow channel is greater than the lengths of the first section and the third section of the second liquid inlet flow channel, and the length of the second section of the second liquid outlet flow channel is greater than the lengths of the first section and the third section of the second liquid outlet flow channel.

[0023] In an embodiment of the first aspect, the length of the second liquid inlet flow channel is greater than the length of the first liquid inlet flow channel, and the length of the second liquid outlet flow channel is greater than the length of the first liquid outlet flow channel.

[0024] In an embodiment of the first aspect, the pipe diameter of the first liquid inlet flow channel is smaller than the pipe diameter of the second liquid inlet flow channel, and the pipe diameter of the first liquid outlet flow channel is smaller than the pipe diameter of the second liquid outlet flow channel.

[0025] As mentioned above, the total length of the first group of flow channels is less than the total length of the second group of flow channels, and the greater the length of the flow channel, the greater the flow resistance of the cooling liquid in the flow channel. In order to further balance the flow resistance between the first group of flow channels and the second group of flow channels, in the embodiment of the present application, the pipe diameter of the first group of flow channels is set to be smaller than the pipe diameter of the second group of flow channels, so as to increase the flow resistance of the first group of flow channels and balance the flow resistance pressure drop between the two groups of flow channels.

[0026] In an embodiment of the first aspect, the dual-motor controller further comprises a control circuit, and the first power module, the control circuit, and the second power module are arranged along a first direction. The bottom plate, the two power modules, and the control circuit are sequentially arranged along a third direction. The projections of the first power module, the second power module, and the control circuit in the third direction do not overlap. That is, the control circuit is arranged between the two power modules, so that the control circuit can be more conveniently electrically connected with the two power modules.

[0027] In one embodiment of the first aspect, the surface of the dual-motor controller housing also includes a signal interface, which is used to connect to the control circuit. The signal interface and the two water outlets are arranged on the same side of the dual-motor controller housing and the distance between the signal interface and the bottom plate is greater than the distance between the two water outlets and the bottom plate.

[0028] In one embodiment of the first aspect, a dual-motor controller housing includes a positive DC input interface and a negative DC input interface. The positive DC input interface, the negative DC input interface, and two water outlets are located on the same side of the dual-motor controller housing. The dual-motor controller is configured to receive power from a power battery via the positive DC input interface and the negative DC input interface. The distance between the positive DC input interface and the negative DC input interface and the base plate is greater than the distance between the signal interface and the base plate. Along a first direction, the first water outlet, the negative DC input interface, and the positive DC input interface are arranged in sequence, followed by the second water outlet.

[0029] That is to say, relative to the two water outlets and the signal interface, the positive DC input interface and the negative DC input interface are away from the base plate and located between the two power modules, so that the power battery can more conveniently supply power to the two power modules through the positive DC input interface and the negative DC input interface.

[0030] In one embodiment of the first aspect, the dual-motor controller further comprises a first copper plate for connection and a second copper plate for connection. The first copper plate for connection comprises a first module connection segment and a first motor connection segment perpendicular to each other, the first module connection segment comprising three first AC input terminals, the first motor connection segment comprising three first AC output terminals, the three first AC input terminals being used to connect to the three-phase output ends of the three-phase bridge arm of the first power module, the three first AC output terminals being used to connect to the three-phase windings of the first motor, the three first AC input terminals being arranged in a first direction, the three first AC output terminals being arranged in a second direction, and the first motor connection segment extending in the second direction to the side where the two water inlets are located. The second copper plate for connection comprises a second module connection segment and a second motor connection segment perpendicular to each other, the second module connection segment comprising three second AC input terminals, the second motor connection segment comprising three second AC output terminals, the three second AC input terminals being used to connect to the three-phase output ends of the three-phase bridge arm of the first power module, the three second AC output terminals being used to connect to the three-phase windings of the second motor, the three second AC input terminals being arranged in the first direction, the three second AC output terminals being arranged in the second direction, and the second motor connection segment extending in the second direction to the side where the two water inlets are located.

[0031] In a second aspect, the present application provides a distributed powertrain for driving two front wheels or two rear wheels of a vehicle, the distributed powertrain comprising two motors and a dual-motor controller as described in any one of the first aspects.

[0032] The beneficial effects of the distributed powertrain provided in the present application are as described in the beneficial effects of the dual-motor controller provided in any one of the first aspects of the present application, and will not be repeated here.

[0033] In a third aspect, the present application provides an electric vehicle, comprising a power battery, two motors, and a dual-motor controller according to any one of the first aspects, wherein the dual-motor controller is configured to receive power from the power battery and drive the two motors; or

[0034] The electric vehicle includes a power battery and a distributed power assembly as described in the second aspect of the present application, and the distributed power assembly is used to receive power from the power battery and to drive the two front wheels or the two rear wheels of the electric vehicle.

[0035] The beneficial effects of the electric vehicle provided in the present application are as described in the beneficial effects of the dual-motor controller provided in any one of the first aspects of the present application or as described in the beneficial effects of the distributed powertrain provided in the second aspect of the present application, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0037] Figure 2 A distributed powertrain architecture diagram provided in an embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of a dual-motor controller cooling structure;

[0039] Figure 4 A schematic structural diagram of a distributed powertrain provided in an embodiment of the present application;

[0040] Figure 5 A schematic structural diagram of a dual-motor controller provided in an embodiment of the present application;

[0041] Figure 6 Another structural diagram of a dual-motor controller provided in an embodiment of the present application;

[0042] Figure 7 Another structural diagram of a dual-motor controller provided in an embodiment of the present application;

[0043] Figure 8 Another structural diagram of a dual-motor controller provided in an embodiment of the present application;

[0044] Figure 9 Another structural diagram of a dual-motor controller provided in an embodiment of the present application;

[0045] Figure 10 Another structural schematic diagram of a dual-motor controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0047] As used herein, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more.

[0048] In this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the structure.

[0049] In addition, references to "embodiments" or "implementations" herein mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0051] Parallel: The parallelism defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for situations where the absolute parallelism is not caused by factors such as assembly tolerance, design tolerance, and the influence of structural flatness.

[0052] Vertical: The vertical defined in the embodiments of the present application is not limited to an absolute vertical intersection relationship (an angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by factors such as assembly tolerance, design tolerance, and the influence of structural flatness. It allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0053] In order to improve the heat dissipation efficiency of a dual-motor controller and solve the problem of complex structure and poor compatibility of the dual-motor controller, embodiments of the present application provide a dual-motor controller, a distributed powertrain, and an electric vehicle.

[0054] With the development of the electric vehicle industry, distributed powertrains have the advantages of high efficiency, small size, low weight and high power density, and have gradually become the mainstream direction of electric drive system design.

[0055] Figure 1 This is a schematic diagram of the structure of the electric vehicle 1 provided in the embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes a distributed powertrain 10, a power battery 40, two front wheels 20, and two rear wheels 30. The distributed powertrain 10 includes a dual-motor controller 11, a first motor 12, and a second motor 13.

[0056] The distributed powertrain 10 is used to receive power from the power battery 40 and drive the two front wheels 20 or the two rear wheels 30 of the electric vehicle 1, wherein the first motor 12 and the second motor 13 are each used to drive one wheel of the electric vehicle 1. Exemplarily, the distributed powertrain 10 is used to drive the two front wheels 20 of the electric vehicle 1, with the first motor 12 being used to drive a left front wheel 20 of the electric vehicle 1, and the second motor 13 being used to drive a right front wheel 20 of the electric vehicle 1. Similarly, the distributed powertrain 10 can also be used to drive the two rear wheels 30 of the electric vehicle 1, with the first motor 12 being used to drive a left rear wheel 30 of the electric vehicle 1, and the second motor 13 being used to drive a right rear wheel 30 of the electric vehicle 1.

[0057] Figure 2 This is a schematic diagram of the architecture of the distributed powertrain 10 provided in the embodiment of the present application. Figure 2 As shown, the dual-motor controller 11 is used to receive power from the power battery 40 and drive the first motor 12 and the second motor 13. The dual-motor controller 11 includes a first power module 111, a second power module 112, and a control circuit 113.

[0058] The first power module 111 and the second power module 112 each include a three-phase bridge arm. The midpoints of the three-phase bridge arms of the first power module 111 are respectively used to connect to the three-phase windings of the first motor 12, and the midpoints of the three-phase bridge arms of the second power module 112 are respectively used to connect to the three-phase windings of the second motor 13. The midpoints of the three-phase bridge arms of the first power module 111 and the second power module 112 can output three-phase drive currents to drive the first motor 12 and the second motor 13, respectively. The first power module 111 includes a three-phase output terminal 1111, which is used to connect to the midpoints of the three-phase bridge arms of the first power module 111. The second power module 112 includes a three-phase output terminal 1121, which is used to connect to the midpoints of the three-phase bridge arms of the first power module 112.

[0059] The dual-motor controller 11 also includes a control circuit 113, which is used to output control signals to the three-phase bridge arm of the first power module 111 and the three-phase bridge arm of the second power module 112 and control the output drive current of the three-phase bridge arm of the first power module 111 and the three-phase bridge arm of the second power module 112.

[0060] During the operation of the dual-motor controller 11 , the two power modules generate a large amount of heat, so the cooling and heat dissipation problem of the dual-motor controller needs to be solved urgently. Figure 3 This is a schematic diagram of a series water channel cooling structure of a dual motor controller. Figure 3 In the illustrated series water channel cooling structure, the coolant flows through a connected flow channel, first through the first power module 111 to dissipate heat for the first power module 111, and then through the second power module 112 to dissipate heat for the second power module 112. This structure results in a longer coolant flow channel, which results in a greater flow resistance for the coolant, resulting in poor cooling effect on the two power modules. Furthermore, since the coolant absorbs heat generated by the first power module 111 as it flows through the first power module 111, causing its temperature to rise, the temperature difference between the coolant and the second power module 112 is smaller when the coolant flows through the second power module 112, resulting in a lower efficiency in transferring heat generated by the second power module 112 to the coolant.

[0061] Figure 4 This is a schematic diagram of the structure of the distributed powertrain 10 provided in the embodiment of the present application. Figure 4 As shown, the distributed powertrain 10 includes a dual motor controller 11, a first motor 12, a second motor 13, a first reducer 14, and a second reducer 15. Figure 4As shown, the distributed powertrain 10 includes a motor housing 18, a reducer housing 19, and a dual-motor controller housing 114. The motor housing 18 is used to accommodate the first motor 12 and the second motor 13, the reducer housing 19 is used to accommodate the first reducer 14 and the second reducer 15, and the dual-motor controller housing 114 is used to accommodate the electrical components of the dual-motor controller 11. The motor housing 18 and the reducer housing 19 are arranged along the second direction, and the reducer housing 19 and the dual-motor controller housing 114 are arranged along the third direction.

[0062] Figure 5 This is a schematic diagram of the structure of the dual motor controller 11 provided in the embodiment of the present application. Figure 5 As shown, the dual motor controller 11 includes a first power module 111, a second power module 112, a control circuit 113, a dual motor controller housing 114, a first power module heat sink 115, and a second power module heat sink 116. Figure 5 As shown, the first power module 111, the control circuit 13, and the second power module 112 are arranged in sequence along a first direction in the dual-motor controller housing 114. The control circuit 113 is used to control the operation of the two power modules.

[0063] The first power module radiator 115 is used to cool the first power module 111, and the second power module radiator 116 is used to cool the second power module 112. The structures of the first power module radiator 115 and the first power module 111 are as shown in FIG. Figure 6 As shown, the first power module heat sink 115 includes two layers of water channels, a first liquid inlet 1151, and a first liquid outlet 1152. The first power module 111 is located between the upper and lower layers of the water channels of the first power module heat sink 115. Coolant flows in through the first liquid inlet 1151 and flows out through the first liquid outlet 1152 after cooling and dissipating the first power module 111. The structure of the second power module heat sink 116 is the same as that of the first power module heat sink 115. The second power module heat sink 116 includes a second liquid inlet 1161 and a second liquid outlet 1162. Coolant flows in through the second liquid inlet 1161 and flows out through the second liquid outlet 1162 after cooling and dissipating the second power module 112.

[0064] The dual-motor controller housing 114 includes a top plate 1141 , a bottom plate 1142 , a first side surface 1143 and a second side surface 1144 arranged opposite to each other along a first direction, and a third side surface 1145 and a fourth side surface 1146 arranged opposite to each other along a second direction.

[0065] The top plate 1141 is perpendicular to the first side surface 1143 , the second side surface 1144 , the third side surface 1145 and the fourth side surface 1146 , and the bottom plate 1142 is also perpendicular to the first side surface 1143 , the second side surface 1144 , the third side surface 1145 and the fourth side surface 1146 .

[0066] like Figure 5 As shown, the fourth side surface 1146 is provided with two water inlets, namely a first water inlet 100 and a second water inlet 101. The third side surface 1145 opposite to the fourth side surface 1146 includes two water outlets, namely a first water outlet 102 and a second water outlet 103. The coolant of the dual-motor controller 11 flows into the interior of the dual-motor controller housing 114 from the two water inlets. The coolant flowing in from the first water inlet 100 then flows into the first power module radiator 115 and flows out from the first water outlet 102 after cooling the first power module 111. The coolant flowing in from the second water inlet 101 flows into the second power module radiator 116 and flows out from the second water outlet 103 after cooling the second power module 112.

[0067] Continue reading Figure 5 Along the first direction, the first water inlet 100 and the second water inlet 101 are arranged on either side of the center of the fourth side surface 1146. The distance from the first water inlet 100 to the midpoint of the fourth side surface 1146 is the same as the distance from the second water inlet 1142 to the midpoint of the fourth side surface 1146. In other words, the first water inlet 100 and the second water inlet 101 are symmetrical about the midpoint of the fourth side surface 1146. Furthermore, along the first direction, the distance between the first water inlet 100 and the first side surface 1143 is equal to the distance between the second water inlet 101 and the second side surface 1144.

[0068] Along the first direction, the first water outlet 102 and the second water outlet 103 are arranged on both sides of the midpoint of the third side surface 1145. The distance between the first water outlet 102 and the midpoint of the third side surface 1145 is the same as the distance between the second water outlet 103 and the midpoint of the third side surface 1145. In other words, the first water outlet 102 and the second water outlet 103 are symmetrical about the midpoint of the third side surface 1145. More specifically, along the first direction, the distance between the first water outlet 102 and the first side surface 1143 is equal to the distance between the second water outlet 103 and the second side surface 1144.

[0069] In the third direction, the height of the first water inlet 100 and the second water inlet 101 is the same, that is, the distance between the first water inlet 100 and the bottom plate 1142 is the same as the distance between the second water inlet 101 and the bottom plate 1142. In the third direction, the height of the first water outlet 102 and the second water outlet 103 is the same, that is, the distance between the first water outlet 102 and the bottom plate 1142 is the same as the distance between the second water outlet 103 and the bottom plate 1142.

[0070] In the third direction, the height of the first water inlet 100 and the second water inlet 101 is greater than the height of the first water outlet 102 and the second water outlet 103, that is, the first water outlet 102 and the second water outlet 103 are closer to the bottom plate 1142 of the dual-motor controller housing 114 than the first water inlet 100 and the second water inlet 101. Since the height of the two water inlets is greater than the height of the two water outlets in the third direction, the cooling liquid can flow from a higher position to a lower position, making full use of the gravitational potential energy of the cooling liquid, increasing the flow rate of the cooling liquid, and improving the cooling effect of the dual-motor controller 11.

[0071] It can also be seen from Figure 5 that in the first direction, the distance between the two water inlets is greater than the distance between the two water outlets.

[0072] Figure 7 A schematic view of the third side 1145 of the dual-motor controller housing 114 is shown in Figure 7 , which includes, in addition to the first water outlet 102 and the second water outlet 103, a signal interface 104, a positive direct current input interface 105, and a negative direct current input interface 106.

[0073] The signal interface 104 is used to connect the control circuit 113, and the signal interface 104 receives signals from the outside and transmits the received signals to the control circuit 113, or the signal interface 104 transmits signals generated by the control circuit 113 to the outside. It can be seen from Figure 7 that in the third direction, the height of the signal interface 104 is greater than the height of the two water outlets, and in the first direction, the signal interface 104 is located between the two water outlets. Such an arrangement can facilitate the connection between the signal interface 104 and the control circuit 113 and simplify the line structure.

[0074] The positive direct current input interface 105 is used to connect the positive electrode of the power battery 40, and the negative direct current input interface 106 is used to connect the negative electrode of the power battery 40. The dual-motor controller 11 is used to receive direct current from the power battery 40 through the positive direct current input interface 105 and the negative direct current input interface 106 and convert the direct current from the power battery 40 into alternating current output. It can be seen from Figure 7It can be seen that the positive DC input interface 105 and the negative DC input interface 106 are arranged along the first direction, and along the third direction, the height of the positive DC input interface 105 and the negative DC input interface 106 is greater than the height of the signal interface 104. In other words, relative to the two water outlets and the signal interface 104, the positive DC input interface 105 and the negative DC input interface 106 are located away from the base plate 1142 and between the two power modules. This allows the power battery 40 to more conveniently supply power to the two power modules through the positive DC input interface 105 and the negative DC input interface 106. In addition, maintaining a certain distance between the positive DC input interface 105 and the negative DC input interface 106 and the signal interface 104 can prevent interference with the signal input and output of the control circuit 113.

[0075] In the embodiment of the present application, the dual-motor controller housing 114 includes two groups of flow channels, namely a first group of flow channels 117 and a second group of flow channels 118 .

[0076] The first set of flow channels 117 is used to connect the first water inlet 100 , the first power module radiator 115 and the first water outlet 102 , and the second set of flow channels 118 is used to connect the second water inlet 101 , the second power module radiator 116 and the second water outlet 103 .

[0077] That is, the first set of flow channels 117 is used to guide the coolant flowing in from the first water inlet 100 to the first power module radiator 115. After the coolant flows through the first power module radiator 115 and dissipates heat for the first power module 111, the first set of flow channels 117 then guides the coolant from the first power module radiator 115 to the first water outlet 102, and the coolant flows out through the first water outlet 102. The second set of flow channels 118 is used to guide the coolant flowing in from the second water inlet 101 to the second power module radiator 116. After the coolant flows through the second power module radiator 116 and dissipates heat for the second power module 112, the second set of flow channels 118 then guides the coolant from the second power module radiator 116 to the second water outlet 103, and the coolant flows out through the second water outlet 103. Inside the dual-motor controller housing 114, the first set of flow channels 117 and the second set of flow channels 118 are independent of each other and form a parallel relationship.

[0078] The dual motor controller 11 in the embodiment of the present application is provided with two water inlets, two groups of flow channels and two water outlets, thereby forming two groups of flow channels connected in parallel, and the two flow channels are used to take away the heat generated by the two power modules. Figure 3The structure of the series water channels shown in FIG. 1 is that, on the one hand, the flow channel lengths of the first group of flow channels 117 and the second group of flow channels 118 are shorter and the flow resistance is smaller. On the other hand, the first group of flow channels 117 and the second group of flow channels 118 respectively cool two power modules. A large temperature difference exists between the coolant in the first group of flow channels 117 and the first power module 111, and a large temperature difference exists between the coolant in the second group of flow channels 118 and the second power module 112, thereby increasing the heat transfer efficiency between the coolant and the two power modules.

[0079] In the embodiment of the present application, the first group of flow channels 117 includes a first liquid inlet channel 1171 and a first liquid outlet channel 1172. The first liquid inlet channel 1171 is used to connect the first water inlet 100 and the first liquid inlet hole 1151, and the first liquid outlet channel 1172 is used to connect the first liquid outlet hole 1152 and the first water outlet 102. The second group of flow channels 118 includes a second liquid inlet channel 1181 and a second liquid outlet channel 1182. The second liquid inlet channel 1181 is used to connect the second water inlet 101 and the second liquid inlet hole 1161, and the second liquid outlet channel 1182 is used to connect the second liquid outlet hole 1162 and the second water outlet 103.

[0080] Figure 8 and Figure 9 1 shows the layout of the first group of flow channels 117 and the second group of flow channels 118. Figure 8 Applicable to the case where the first power module 111 and the second power module 112 are arranged in a mirror image. Figure 9 This is applicable to the case where the first power module 111 and the second power module 112 are arranged in a translational manner.

[0081] When the first power module 111 and the second power module 112 are arranged in a mirror image, the structures of the first group of flow channels 117 and the second group of flow channels 118 are as follows: Figure 8 As shown. The mirror-image arrangement of the first power module 111 and the second power module 112 means that, along a first direction, the first power module 111 and the second power module 112 are mirror-symmetrical about the center line of the dual-motor controller housing 114. In this arrangement, the first liquid inlet 1151 and the second liquid inlet 1161 are arranged opposite each other, and the distance from the first liquid inlet 1151 to the first side surface 1143 is equal to the distance from the second liquid inlet 1161 to the second side surface 1144. At this time, the direction from the first liquid inlet 1151 to the first liquid outlet 1152 is opposite to the direction from the second liquid inlet 1161 to the second liquid outlet 1162, that is, the flow direction of the coolant in the first power module radiator 115 is opposite to the flow direction in the second power module radiator 116.

[0082] When the first power module 111 and the second power module 112 are arranged in a mirror image, the first liquid inlet channel 1171 , the first liquid outlet channel 1172 , the second liquid inlet channel 1181 and the second liquid outlet channel 1182 are all “L-shaped” pipes.

[0083] The first liquid inlet channel 1171, the first liquid outlet channel 1172, the second liquid inlet channel 1181, and the second liquid outlet channel 118 each include a first section and a second end that are perpendicular to each other. The first section of each channel extends along the second direction, and the second section of each channel extends along the first direction. The length of the first section of each channel is greater than the length of the second section.

[0084] When the first power module 111 and the second power module 112 are arranged in a mirror-image arrangement, the diameter of the first liquid inlet channel 1171 is equal to the diameter of the second liquid inlet channel 1181, and the diameter of the first liquid outlet channel 1172 is equal to the diameter of the second liquid outlet channel 1182. The length of the first liquid inlet channel 1171 is equal to the length of the second liquid inlet channel 1181, and the length of the first liquid outlet channel 1172 is equal to the length of the second liquid outlet channel 1182.

[0085] It can be seen from this that when the first power module 111 and the second power module 112 are arranged in a mirror image, the structures of the first group of flow channels 117 and the second group of flow channels 118 are also arranged in a mirror image.

[0086] like Figure 8 As shown, when the first power module 111 and the second power module 112 are arranged in a mirror image, the three-phase output terminal 1111 of the first power module 111 and the three-phase output terminal 1121 of the second power module 112 are in opposite directions, and the three-phase output terminal 1111 is connected to the three-phase winding of the first motor 12, and the three-phase output terminal 1121 is connected to the three-phase winding of the second motor 13. When the three-phase output terminal 1111 and the three-phase output terminal 1121 are in opposite directions, the connection relationship between the two motors and the three-phase winding and the two power modules will become complicated, thereby causing the internal structure of the dual-motor controller 11 to be more complicated.

[0087] In one embodiment, the first power module 111 and the second power module 112 are arranged in a translational manner, and the structures of the first group of flow channels 117 and the second group of flow channels 118 are as follows: Figure 9 As shown. The first power module 111 and the second power module 112 are arranged in a translational manner, meaning that the first power module 111 is disposed facing each other. That is, the direction of the first liquid inlet 1151 toward the first liquid outlet 1152 is opposite to the direction of the second liquid inlet 1161 toward the second liquid outlet 1162. In this arrangement, the distance from the first liquid inlet 1151 to the first side surface 1143 is equal to the distance from the second liquid outlet 1162 to the second side surface 1144, and the distance from the first liquid outlet 1152 to the first side surface 1143 is equal to the distance from the second liquid inlet 1161 to the second side surface 1144.

[0088] Compared with the mirror arrangement as described above, when the two power modules are arranged in a translational manner, the three-phase output end 1111 of the first power module 111 and the three-phase output end 1121 of the second power module 112 are in the same direction. Figure 4 It can be seen that the two motors are arranged on the same side of the dual-motor controller 11. When the three-phase output terminal 1111 and the three-phase output terminal 1121 are oriented in the same direction, the two power modules can be directly connected to the two motors, thereby making the connection method between the dual-motor controller 11 and the two motors simpler and the internal structure design simpler.

[0089] like Figure 9 As shown, the first liquid inlet channel 1171 can guide the coolant from the first water inlet 100 to the first liquid inlet hole 1151. The first liquid inlet channel 1171 includes a first section 1171-a and a second section 1171-b that are perpendicular to each other. One end of the first section 1171-a is connected to the first water inlet 100, and the second section 1171-b connects the other end of the first section 1171-a and the first liquid inlet hole 1151. The first section 1171-a extends along the second direction, and the second section 1171-b extends along the first direction. The length of the first section 1171-a is greater than the length of the second section 1171-b. The first section 1171-a and the second section 1171-b of the first liquid inlet channel 1171 are arranged in an "L" shape.

[0090] The first liquid outlet channel 1172 can guide the coolant from the first liquid outlet hole 1152 to the first water outlet 102. The second liquid inlet channel 1172 includes a first section 1172-a and a second section 1172-b that are perpendicular to each other. One end of the first section 1172-a is connected to the first water outlet 102, and the second section 1172-b is connected to the other end of the first section 1171-a and the first liquid outlet hole 1152. The first section 1172-a extends along the second direction, and the second section 1172-b extends along the first direction. The length of the first section 1172-a is greater than the length of the second section 1172-b. The first section 1172-a and the second section 1172-b of the first liquid inlet channel 1172 are arranged in an "L" shape.

[0091] Continue reading Figure 9The second liquid inlet channel 1181 includes a first section 1181-a, a second section 1181-b, and a third section 1181-c, which are connected in sequence. The first section 1181-a extends along the second direction, the third section 1181-c extends along the first direction, and the second section 1181-b is used to connect the first section 1181-a and the third section 1181-c. One end of the first section 1181-a is used to connect to the second water inlet 102, one end of the third section 1181-c is used to connect to the second liquid inlet hole 1161, and the second section 1181-b is used to connect the other end of the first section 1181-a and the other end of the third section 1181-c.

[0092] The angle between the first segment 1181-a and the second segment 1181-b is an obtuse angle, and the angle between the second segment 1181-b and the third segment 1181-c is an obtuse angle. The length of the second segment 1181-b is greater than the lengths of the first segment 1181-a and the third segment 1181-c.

[0093] Similarly, the second liquid outlet channel 1182 includes a first section 1182-a, a second section 1182-b, and a third section 1182-c, which are connected in sequence. The first section 1182-a extends along the second direction, the third section 1182-c extends along the first direction, and the second section 1182-b connects the first section 1182-a and the third section 1182-c. One end of the first section 1182-a connects to the second water outlet 103, one end of the third section 1182-c connects to the second liquid outlet 1162, and the second section 1182-b connects the other end of the first section 1182-a and the other end of the third section 1182-c. The angle between the first section 1182-a and the second section 1182-b is obtuse, and the angle between the second section 1182-b and the third section 1182-c is also obtuse. The length of the second section 1182-b is greater than the lengths of the first section 1182-a and the third section 1182-c.

[0094] Continue reading Figure 9 When the two power modules are arranged in a translational manner, the length of the second liquid inlet channel 1181 is greater than the length of the first liquid inlet channel 1171 and the length of the second liquid outlet channel 1182 is greater than the length of the second liquid inlet channel 1172 .

[0095] The first group of flow channels 117 connects the first water inlet 100 and the first water outlet 102, while the second group of flow channels 118 connects the second water inlet 101 and the second water outlet 103. When the two power modules are arranged in a translational manner, the length of the first group of flow channels 117 is shorter than the length of the second group of flow channels 118, which results in the pressure drop of the coolant in the first group of flow channels 117 being smaller than the pressure drop of the coolant in the second group of flow channels 118. In order to balance the pressure drop of the coolant in the first group of flow channels 117 and the pressure drop of the coolant in the second group of flow channels 118, in the embodiment of the present application, the angles of the first section 1171-a and the second section 1171-b of the first liquid inlet flow channel 1171 and the first section 1172-a and the second section 1172-b of the first liquid outlet flow channel 1172 are all right angles, while the angles between the three sections of the second liquid inlet flow channel 1181 and the second liquid outlet flow channel 1182 are obtuse angles. For example, the angles between the first section 1181-a and the second section 1181-b of the second liquid inlet channel 1181, as well as the angles between the second section 1181-b and the third section 1181-c, are all obtuse angles. Compared to a right-angle design, the obtuse-angle design of the channels can effectively reduce the flow resistance and pressure drop of the coolant in the second set of channels 118. In other words, when the two power modules are arranged in a translational manner, the first set of channels 117 are short-path right-angle channels, and the second set of channels 118 are long-path obtuse-angle channels. By balancing the lengths and angles of the two sets of channels, the pressure drops of the two sets of channels can be balanced, thereby ensuring that the pressures of the two sets of channels at the water outlet are equivalent.

[0096] In one embodiment, the length of the second liquid inlet channel 1181 is greater than the length of the first liquid inlet channel 1171 , and the length of the second liquid outlet channel 1182 is greater than the length of the first liquid outlet channel 1172 .

[0097] In one embodiment, the diameter of the first liquid inlet channel 1171 is smaller than the diameter of the second liquid inlet channel 1181, and the diameter of the first liquid outlet channel 1172 is smaller than the diameter of the second liquid outlet channel 1182. The diameter of the first liquid inlet channel 1171 is equal to the diameter of the first liquid outlet channel 1172, and the diameter of the second liquid inlet channel 1181 is equal to the diameter of the second liquid outlet channel 1182.

[0098] As mentioned above, the total length of the first group of flow channels 117 is smaller than the total length of the second group of flow channels 118. The longer the flow channels, the greater the flow resistance of the coolant in the flow channels. In order to further balance the flow resistance between the first group of flow channels 117 and the second group of flow channels 118, in an embodiment of the present application, the flow resistance of the coolant in the first group of flow channels 117 is increased by setting the pipe diameter of the first group of flow channels 117 to be smaller than the pipe diameter of the second group of flow channels 118, thereby balancing the flow resistance pressure drop between the two groups of flow channels.

[0099] Figure 10 The structural diagrams of the two groups of flow channels are given. Figure 10As shown, the bottom plate 1142 includes a first set of flow channel grooves and a second set of flow channel grooves. The first set of flow channel grooves is recessed along a third direction from the bottom surface of the bottom plate toward the two power modules, and the first set of flow channel grooves is used to form a first set of flow channels 117. The second set of flow channel grooves 118 is recessed along the third direction from the bottom surface of the bottom plate toward the two power modules, and the second set of flow channel grooves is used to form a second set of flow channels 118.

[0100] The first set of flow channels 117 and the second set of flow channels 118 provided in this application are disposed on the bottom plate 1142, thereby fully utilizing the structure and materials of the bottom plate 1142 itself, saving space and improving the structural integration of the dual-motor controller 11. Furthermore, because the first set of flow channels 117 and the second set of flow channels 118 are formed by inwardly recessing the outer surface of the bottom plate 1142, the two sets of flow channels are isolated from the components within the dual-motor controller housing 114, thereby improving the insulation safety of the dual-motor controller 11. Figure 10 The layout diagram of the two sets of flow channels given is a schematic diagram of the two power modules adopting a translationally symmetrical layout. When the two power modules adopt a mirrored layout, the layout of the two sets of flow channels is as described above and will not be repeated here.

[0101] Combine Figure 10 as well as Figure 5 It can be seen that the first set of flow channels 117 and the second set of flow channels 118 are arranged on the bottom plate 1142 of the dual-motor controller housing 114, and the two water inlets and two water outlets are arranged on the side walls of the dual-motor controller housing 114, that is, the height of the two water inlets and the two water outlets in the third direction is greater than that of the two sets of flow channels, or in other words, there is a height difference between the two water inlets and the two water outlets and the two sets of flow channels. Since the two sets of flow channels, the two water inlets and the two water outlets are not in the same plane, the first water inlet 100 and the first liquid inlet channel 1171 are connected through the first liquid inlet transition section, and the first liquid outlet channel 1172 and the first water outlet 102 are connected through the first liquid outlet transition section. The second water inlet 101 and the second liquid inlet channel 1181 are connected through the second liquid inlet transition section, and the second liquid outlet channel 1182 and the second water outlet 103 are connected through the second liquid outlet transition section. In the third direction, the heights of the two water inlets are greater than those of the two water outlets, so the length of the first liquid inlet transition section is greater than that of the first liquid outlet transition section, and the length of the second liquid inlet transition section is greater than that of the second liquid outlet transition section.

[0102] Similarly, the first power module 111 and the second power module 112 are arranged inside the dual-motor controller housing 114, and there is also a drop in the third direction between the first power module 111, the second power module 112 and the bottom plate. Therefore, the first liquid inlet 1151 and the first liquid inlet channel 1171 are connected through the first liquid inlet connecting section 1191, the first liquid outlet hole 1152 and the first liquid outlet channel are connected through the first liquid outlet connecting section 1192, the second liquid inlet hole and the second liquid inlet channel 1181 are connected through the second liquid inlet connecting section 1193, and the second liquid outlet hole and the second liquid outlet channel 1182 are connected through the second liquid outlet connecting section 1194.

[0103] In one embodiment, the dual-motor controller 11 further includes a first copper wiring plate 1110 and a second copper wiring plate 1120 . The first copper wiring plate 1110 is used to connect the first power module 111 and the first motor 12 .

[0104] The first copper plate 1110 includes three first AC input terminals and three first AC output terminals. The three first AC input terminals of the first copper plate 1110 are used to connect to the three-phase output end 1111 of the first power module 111, and the three first AC output terminals of the first copper plate 1110 are used to connect to the three-phase winding of the first motor 12. The second copper plate 1120 includes three second AC input terminals and three second AC output terminals. The three second AC input terminals of the second copper plate 1120 are used to connect to the three-phase output end of the power module, and the three second AC output terminals of the second copper plate 1120 are used to connect to the three-phase winding of the second motor 13.

[0105] First copper wiring plaque 1110 includes a first wiring segment 1110-a and a second wiring segment 1110-b, which are perpendicular to each other. First wiring segment 1110-a is arranged along a first direction, and the three first AC input terminals of first copper wiring plaque 1110 are arranged along the first direction on the surface of the first wiring segment. Second wiring segment 1110-b is arranged along a second direction, and the three first AC output terminals of first copper wiring plaque 1110 are arranged along the second direction on the surface of second wiring segment 1110-b.

[0106] Second copper wiring plaque 1120 includes a first wiring segment 1120-a and a second wiring segment 1120-b, which are perpendicular to each other. First wiring segment 1120-a is arranged along a first direction, and the three second AC input terminals of second copper wiring plaque 1120 are arranged along the first direction on the surface of first wiring segment 1120-a. Second wiring segment 1120-b is arranged along a second direction, and the three second AC output terminals of second copper wiring plaque 1120 are arranged along the first direction on the surface of second wiring segment 1120-b.

[0107] The double-motor power assembly and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range will be changed, and the above description of the specification should not be understood as a limitation of the present application.

Claims

1. A dual-motor controller with a parallel waterway design, characterized in that: The dual-motor controller comprises: Two power modules, each of the two power modules includes a three-phase bridge arm, and the three-phase bridge arm of each power module is used to drive a motor; Two power module radiators, each of the power module radiators is used to receive coolant through a liquid inlet hole and is used to cool one of the two power modules; A dual-motor controller housing, the dual-motor controller housing is used to accommodate the two power modules and the two power module radiators, and the dual-motor controller housing includes two water inlets and two water outlets; The dual-motor controller housing includes a first set of flow channels and a second set of flow channels, wherein the first set of flow channels is used to connect one of the two water inlets, one of the power module radiators, and one of the two water outlets; The second group of flow channels is used to connect the other water inlet of the two water inlets, the other power module radiator and the other water outlet of the two water outlets.

2. The dual-motor controller according to claim 1, characterized in that: The two water inlets are arranged on one side of the dual-motor controller housing, and the two water outlets are arranged on another side opposite to the one side. The two water inlets are arranged along a first direction, the two water outlets are arranged along the first direction, the two power modules are arranged along the first direction, and the two power module radiators are arranged along the first direction. The dual-motor controller further includes a base plate, wherein the base plate and the two power module radiators are stacked along a third direction; The third direction is perpendicular to the first direction.

3. The dual-motor controller according to claim 1, characterized in that: The dual-motor controller housing includes a bottom plate, the bottom plate includes a first set of flow channel grooves and a second set of flow channel grooves, the first set of flow channel grooves is recessed from the lower surface of the bottom plate toward the two power modules along a third direction, and the first set of flow channel grooves is used to form the first set of flow channels; The second group of flow channel grooves are recessed from the lower surface of the bottom plate toward the two power modules along a third direction, and the second group of flow channel grooves are used to form the second group of flow channels.

4. The dual-motor controller according to claim 1, characterized in that: The two power module radiators include a first power module radiator and a second power module radiator, the first power module radiator includes a first liquid inlet hole and a first liquid outlet hole, and the second power module radiator includes a second liquid inlet hole and a second liquid outlet hole; The first group of flow channels includes a first liquid inlet flow channel and a first liquid outlet flow channel, the first liquid inlet flow channel is used to connect the one water inlet and the first liquid inlet hole, and the first liquid outlet flow channel is used to connect the first liquid outlet hole and the one water outlet; The second group of flow channels includes a second liquid inlet channel and a second liquid outlet channel, the second liquid inlet channel is used to connect the other water inlet and the second liquid inlet hole, and the second liquid outlet channel is used to connect the second liquid outlet hole and the other water outlet.

5. The dual-motor controller according to claim 2, characterized in that: Along the first direction, the distance between the two water outlets is greater than the distance between the two water inlets; along the third direction, the distance between the two water inlets and the bottom plate is greater than the distance between the two water outlets and the bottom plate.

6. The dual-motor controller according to claim 4, characterized in that: The flow direction of the coolant in the first power module radiator is the same as the flow direction of the coolant in the second power module radiator; The three-phase output end of the three-phase bridge arm of the first power module and the three-phase output end of the three-phase bridge arm of the second power module are oriented in the same direction.

7. The dual-motor controller according to claim 4, characterized in that: The first liquid inlet channel includes a first section and a second section perpendicular to each other, the first section of the first liquid inlet channel is used to connect the one water inlet and one end of the second section of the first liquid inlet channel, the other end of the second section of the first liquid inlet channel is used to connect the first liquid inlet, and the length of the first section of the first liquid inlet channel is greater than the length of the second section of the first liquid inlet channel; The first liquid outlet channel includes a first section and a second section that are perpendicular to each other. The first section of the first liquid outlet channel is used to connect the one water outlet and one end of the second section of the first liquid outlet channel. The other end of the second section of the first liquid outlet channel is used to connect the first liquid outlet. The length of the first section of the first liquid outlet channel is greater than the length of the second section of the first liquid outlet channel.

8. The dual-motor controller according to claim 7, characterized in that: The second liquid inlet channel includes a first section, a second section, and a third section that are connected to each other, the first section of the second liquid inlet channel is used to connect the other water inlet and one end of the second section of the second liquid inlet channel, the third section of the second liquid inlet channel is used to connect the second liquid inlet and the other end of the second section of the second liquid inlet channel, the angle between the first section of the second liquid inlet channel and the second section of the second liquid inlet channel is an obtuse angle, and the angle between the second section of the second liquid inlet channel and the third section of the second liquid inlet channel is an obtuse angle; The second liquid outlet channel includes a first section, a second section and a third section that are connected to each other. The first section of the second liquid outlet channel is used to connect the other water outlet and one end of the second section of the second liquid outlet channel. The third section of the second liquid outlet channel is used to connect the second liquid outlet and the other end of the second section of the second liquid outlet channel. The angle between the first section of the second liquid outlet channel and the second section of the second liquid outlet channel is an obtuse angle, and the angle between the second section of the second liquid outlet channel and the third section of the second liquid outlet channel is an obtuse angle.

9. The dual-motor controller according to claim 8, characterized in that: The length of the second section of the second liquid inlet channel is greater than the length of the first section of the second liquid inlet channel and the length of the third section of the second liquid inlet channel; The length of the second section of the second liquid outlet channel is greater than the lengths of the first section of the second liquid outlet channel and the third section of the second liquid outlet channel.

10. The dual-motor controller according to claim 8, characterized in that: The length of the second liquid inlet channel is greater than that of the first liquid inlet channel, and the length of the second liquid outlet channel is greater than that of the first liquid outlet channel.

11. The dual-motor controller according to claim 8, characterized in that: The diameter of the first liquid inlet channel is smaller than that of the second liquid inlet channel, and the diameter of the first liquid outlet channel is smaller than that of the second liquid outlet channel.

12. The dual-motor controller according to claim 2, characterized in that: The dual-motor controller further includes a control circuit, the two power modules include a first power module and a second power module, the first power module, the control circuit, and the second power module are arranged along a first direction, the base plate, the two power modules, and the control circuit are arranged in sequence along a third direction, and the projections of the first power module, the second power module, and the control circuit in the third direction do not overlap; The surface of the dual-motor controller housing also includes a signal interface, which is used to connect to the control circuit. The signal interface and the two water outlets are arranged on the same side of the dual-motor controller housing and the distance between the signal interface and the bottom plate is greater than the distance between the two water outlets and the bottom plate.

13. The dual-motor controller according to claim 12, characterized in that: The surface of the dual-motor controller housing includes a positive DC input interface and a negative DC input interface. The positive DC input interface, the negative DC input interface and the two water outlets are arranged on the same side of the dual-motor controller housing. The dual-motor controller is used to receive power from the power battery through the positive DC input interface and the negative DC input interface. The distances between the positive DC power input interface and the negative DC power input interface and the bottom plate are greater than the distance between the signal interface and the bottom plate.

14. The dual-motor controller according to claim 2, characterized in that: The dual-motor controller further includes a first copper plate for connection and a second copper plate for connection, and the two power modules include a first power module and a second power module; wherein, The first copper connection plate includes a first module connection segment and a first motor connection segment that are perpendicular to each other. The first module connection segment includes three first AC input terminals, and the first motor connection segment includes three first AC output terminals. The three first AC input terminals are used to connect to the three-phase output ends of the three-phase bridge arm of the first power module, and the three first AC output terminals are used to connect to the three-phase windings of the first motor. The three first AC input terminals are arranged along the first direction, and the three first AC output terminals are arranged along the second direction. The first motor connection segment extends along the second direction to the side where the two water inlets are located. The second wiring copper plate includes a second module wiring segment and a second motor wiring segment that are perpendicular to each other. The second module wiring segment includes three second AC input terminals. The second motor wiring segment includes three second AC output terminals. The three second AC input terminals are used to connect the three-phase output ends of the three-phase bridge arm of the second power module. The three second AC output terminals are used to connect the three-phase windings of the second motor. The three second AC input terminals are arranged along the first direction, the three second AC output terminals are arranged along the second direction, and the second motor wiring segment extends out along the second direction from the side where the two water inlets are located.

15. A distributed powertrain, characterized in that: The distributed powertrain is used to drive two front wheels or two rear wheels of a vehicle, and the distributed powertrain includes two motors and a dual-motor controller as described in any one of claims 1 to 14.

16. An electric vehicle, characterized in that: The electric vehicle comprises: A power battery, two motors, and a dual-motor controller according to any one of claims 1 to 14, wherein the dual-motor controller is configured to receive power from the power battery and drive the two motors; or A power battery and a distributed power assembly as claimed in claim 15, wherein the distributed power assembly is used to receive power from the power battery and to drive the two front wheels or the two rear wheels of the electric vehicle.

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