Electric drive assembly heat dissipation system, electric drive assembly and vehicle

Abstract

The invention relates to the technical field of heat dissipation, in particular to an electric drive assembly heat dissipation system, an electric drive assembly and a vehicle, the electric drive assembly heat dissipation system comprises a first heat source, a first power module, a second power module, a cooling flow path trunk and at least two cooling flow path branches connected in parallel; the cooling flow path main path is communicated with each cooling flow path branch path, and part or all of the first heat source, the first power module and the second power module are arranged on the cooling flow path branch paths and / or the cooling flow path main path so as to balance the heat dissipation area of the cooling flow path and the flow speed of the cooling medium. According to the electric drive assembly, the cooling flow paths which are connected in series and in parallel are adopted to conduct heat dissipation on all integrated parts on the electric drive assembly, so that the heat dissipation area and the flow speed of a cooling medium are balanced, heat accumulation in the cooling medium is reduced, and the heat dissipation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat dissipation technology, and particularly relates to an electric drive assembly heat dissipation system, an electric drive assembly and a vehicle. BACKGROUND

[0002] With the development of new energy vehicles, pure electric household vehicles have become more and more popular. In order to reduce development costs and improve space utilization, the existing technology integrates components such as an on-board charger, a converter, a motor controller, a motor, a contactor and a power distribution unit together to form an electric drive assembly.

[0003] During the operation of the vehicle, the motor, the motor controller and the on-board charger and other components will generate heat. If not cooled in time, it will affect the normal operation of the electric drive assembly. Therefore, a cooling flow channel for dissipating heat of the integrated components is generally arranged on the electric drive assembly.

[0004] The arrangement of the cooling flow channel will greatly affect the heat dissipation efficiency. Too fast flow rate of the cooling flow channel will result in uneven heat dissipation, and too slow flow rate of the cooling flow channel will affect the heat dissipation efficiency. Therefore, how to better arrange the cooling flow channel has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The embodiments of the present application provide an electric drive assembly heat dissipation system, an electric drive assembly and a vehicle to solve the problem of how to better arrange the cooling flow channel to improve the heat dissipation efficiency of the electric drive assembly.

[0006] The embodiments of the present application provide an electric drive assembly heat dissipation system, which comprises a first heat source, a first power module, a second power module, a cooling flow path trunk and at least two cooling flow path branches in parallel with each other. The cooling flow path trunk is in communication with each of the cooling flow path branches. Part or all of the first heat source, the first power module and the second power module are arranged in the cooling flow path branches and / or the cooling flow path trunk to balance the heat dissipation area of the cooling flow path and the flow rate of the cooling medium in the cooling flow path. Optionally, when the first heat source is arranged in the cooling flow path trunk, the first power module and the second power module are arranged on different cooling flow path branches, respectively.

[0007] When the first heat source is arranged in one of the cooling flow path branches, the first power module and the second power module are arranged on different cooling flow path branches, respectively, and one of the power modules and the first heat source are located on the same cooling flow path branch, or the first power module and the second power module are arranged on another cooling flow path branch at the same time.

[0008] Optionally, the first heat source and the first power module or the second power module are arranged on the same cooling flow path branch, and the first power module or the second power module is located on the side of the first heat source close to the outlet of the cooling flow path branch along the flow direction of the cooling medium.

[0009] Optionally, the electric drive assembly cooling system further comprises a motor controller, and the motor controller is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0010] Optionally, the motor controller and the first power module or the second power module are arranged on the same cooling flow path branch, and the first power module or the second power module is located on the side of the motor controller close to the outlet of the cooling flow path branch along the flow direction of the cooling medium.

[0011] Optionally, the electric drive assembly cooling system further comprises a second heat source, and the second heat source is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0012] Optionally, the electric drive assembly cooling system further comprises a third heat source, and the third heat source is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0013] Optionally, the electric drive assembly cooling system further comprises a fourth heat source, and the fourth heat source is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0014] Optionally, the fourth heat source and the first heat source are arranged on the same cooling flow path branch, and the fourth heat source is located on the side of the first heat source close to the inlet of the cooling flow path branch along the flow direction of the cooling medium.

[0015] Optionally, the electric drive assembly cooling system further comprises a fifth heat source, and the fifth heat source is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0016] Optionally, the first heat source comprises a first capacitor, and the first capacitor is arranged on the cooling flow path main branch or any of the cooling flow path branches.

[0017] Optionally, the first heat source further comprises a third power module, and one of the cooling flow path branches comprises at least two cooling flow path sub-branches arranged in parallel, and the third power module and the first capacitor are arranged on different cooling flow path sub-branches respectively.

[0018] Optionally, one of the cooling flow path branches comprises at least two cooling flow path sub-branches arranged in parallel, and the first power module and the second power module are arranged on different cooling flow path sub-branches respectively.

[0019] Optionally, the electric drive assembly cooling system further comprises a first driving member, an outlet of the first driving member being communicated with an inlet of the cooling flow path dry channel, and the first driving member being configured to drive the cooling medium to flow.

[0020] Optionally, the electric drive assembly cooling system further comprises a heat exchanger, a first inlet of the heat exchanger being communicated with an outlet of the cooling flow path dry channel, and a first outlet of the heat exchanger being communicated with an inlet of the first driving member.

[0021] Optionally, the electric drive assembly cooling system further comprises a motor and a second driving member, an outlet of the second driving member being communicated with a second inlet of the heat exchanger, and an inlet of the second driving member being communicated with a second outlet of the heat exchanger, and the motor being arranged on the cooling flow path between the outlet of the second driving member and the second inlet of the heat exchanger.

[0022] The embodiment of the present application further provides an electric drive assembly comprising the above-mentioned electric drive assembly cooling system.

[0023] The embodiment of the present application further provides a vehicle comprising the above-mentioned electric drive assembly.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] In the embodiment of the present application, the arrangement of the cooling flow path is improved, and the cooling flow path in series and in parallel is adopted to cool each integrated component on the electric drive assembly, so as to solve the problem of uneven heat dissipation caused by small heat exchange area and too fast flow rate when the cooling flow path is used in series, and solve the problem of too low flow rate when the cooling flow path is used in parallel, so as to balance the heat dissipation area and the flow rate of the cooling medium, reduce the accumulation of heat in the cooling medium, and improve the heat dissipation efficiency; and compared with the cooling flow path in complete parallel, the appropriate series connection can reduce the volume of the cooling flow path structure, which is beneficial to the miniaturization design of the electric drive assembly, so as to improve the space utilization rate.

[0026] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the embodiment can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiment of the present application is described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiment of the present application or the prior art, the drawings needed in the embodiment description will be briefly introduced as follows.

[0028] Figure 1 A cooling flow path schematic diagram of an electric drive assembly cooling system provided by the embodiment of the present application;

[0029] Figure 2 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0030] Figure 3 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0031] Figure 4 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0032] Figure 5 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0033] Figure 6 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0034] Figure 7 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0035] Figure 8 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0036] Figure 9 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0037] Figure 10 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0038] Figure 11 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0039] Figure 12 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0040] Figure 13 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0041] Figure 14 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application;

[0042] Figure 15 A cooling flow path schematic diagram of another electric drive assembly heat dissipation system provided by the embodiment of the present application; BRIEF DESCRIPTION OF DRAWINGS

[0044] 1, on-vehicle charger; 2, first power module; 3, second power module; 4, motor controller; 5, contactor; 6, inductor; 7, power distribution unit; 8, copper bar; 9, first capacitor; 10, third power module; 11, first driving member; 12, heat exchanger; 13, motor; 14, second driving member. DETAILED DESCRIPTION

[0045] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is to be understood that the present application can be variously implemented without being limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0046] Referring to Figures 1-4 , the present embodiment provides a heat dissipation system for an electric drive assembly, which comprises a first heat source, a first power module 2, a second power module 3, a cooling flow path trunk, and at least two cooling flow path branches in parallel with each other, the cooling flow path trunk being in communication with each of the cooling flow path branches; part or all of the first heat source, the first power module 2, and the second power module 3 are arranged in the cooling flow path branches and / or the cooling flow path trunk, so as to balance the heat dissipation area of the electric drive assembly and the flow rate of the cooling medium in the cooling flow path.

[0047] Specifically, each integrated component of the electric drive assembly can be arranged on the electric drive assembly housing, and a cooling flow channel for the cooling medium to flow through is arranged on the housing, so as to form a series and parallel cooling flow path in the electric drive assembly heat dissipation system. The number of cooling flow path branches can be two, three, or four, and the specific number can be flexibly arranged according to the number of components that need to be cooled, and the present embodiment does not limit the number. In order to clearly and specifically disclose the specific embodiments of the present application, the following will take two cooling flow path branches as an example. The first heat source is the related heat generating components of the motor controller in the electric drive assembly, including but not limited to the on-vehicle charger, the vehicle controller, the domain controller, the converter, the contactor, the inductor, the capacitor, the power distribution unit, or the copper bar. The first heat source of the present embodiment preferably adopts the on-vehicle charger 1.

[0048] As shown in the embodiment of Figure 1 , the first heat source is arranged in the cooling flow path trunk, and the first power module 2 and the second power module 3 are arranged in one cooling flow path branch, respectively. As shown in the embodiments of Figure 2 and Figure 3 , one of the first heat source, the first power module 2, and the second power module 3 is arranged in one cooling flow path branch, and the other of the first power module 2 and the second power module 3 is arranged in the other cooling flow path branch. As shown in the embodiment of Figure 4In the shown embodiment, the first heat source is arranged in one cooling flow branch, and the first power module 2 and the second power module 3 are arranged in another cooling flow branch.

[0049] In the embodiment, the arrangement of the cooling flow is improved, and the cooling flow in series and in parallel is adopted to dissipate heat from each integrated component on the electric drive assembly. Compared with the mode of dissipating heat in series, the flow area of the cooling flow can be increased, the heat dissipation area between the cooling flow and each component can be increased, and the heat dissipation is not uniform due to the too fast flow speed in the flow channel. Compared with the mode of dissipating heat in parallel, the flow speed of the cooling medium in the flow channel is increased, and thus the heat dissipation area and the flow speed of the cooling medium are balanced, the heat accumulation in the cooling medium is reduced, and the heat dissipation efficiency is improved. Compared with the cooling flow in parallel, the appropriate series connection can reduce the volume of the cooling flow structure, and is beneficial to the miniaturization design of the electric drive assembly, so as to improve the space utilization and reduce the processing cost.

[0050] Optionally, when the first heat source is arranged in the cooling flow main line, the first power module 2 and the second power module 3 are arranged on different cooling flow branches respectively; when the first heat source is arranged in one of the cooling flow branches, the first power module 2 and the second power module 3 are arranged on different cooling flow branches respectively, and one of the power modules and the first heat source are arranged on the same cooling flow branch, or the first power module 2 and the second power module 3 are arranged on another cooling flow branch simultaneously.

[0051] Figure 1 A cooling flow schematic diagram of an electric drive assembly heat dissipation system is specifically shown, in which the first heat source, i.e., the on-board charger 1, is arranged in the cooling flow main line, and the first power module 2 and the second power module 3 are arranged on different cooling flow branches respectively. A cooling circuit is formed between the water pump and the oil cooler, and water is used as the cooling medium. The water cooling has good cooling effect and uniform cooling temperature. Another cooling circuit is formed between the oil pump and the oil cooler, and the cooling oil is used as the cooling medium. The oil medium has good insulation and non-magnetic properties, and has the advantages of low freezing point and high boiling point.

[0052] When the electric drive assembly cooling system is working, water is output by the water pump, flows along the cooling flow path main path and carries away the heat in the area of the on-board charger 1, then enters two cooling flow path branches respectively, exchanges heat with the power modules on each cooling flow path branch, then converges to the cooling flow path main path and enters the oil cooler to exchange heat with the cooling oil, and finally returns to the water pump and is cooled by the condenser in the water pump before re-entering the cooling flow path main path. The cooling oil is output by the oil pump, then passes through the area of the motor 13 and carries away the heat, then enters the oil cooler to exchange heat with the water, lowers its temperature with the help of the water, and then returns to the oil pump.

[0053] Figure 2 Specifically, a cooling flow path schematic diagram of another electric drive assembly cooling system is shown, in which the first heat source, i.e. the on-board charger 1, is arranged on one of the cooling flow path branches, the first power module 2 and the second power module 3 are arranged on different cooling flow path branches respectively, and the first power module 2 is located on the same cooling flow path branch as the on-board charger 1. A cooling loop is formed between the water pump and the oil cooler, and water is used as the cooling medium. Another cooling loop is formed between the oil pump and the oil cooler, and cooling oil is used as the cooling medium.

[0054] When the electric drive assembly cooling system is working, water is output by the water pump, flows along the cooling flow path main path, then flows along the two cooling flow path branches, exchanges heat with the on-board charger 1 and the first power module 2 on the first cooling flow path branch in sequence, exchanges heat with the second power module 3 on the second cooling flow path branch, then converges to the cooling flow path main path and enters the oil cooler to exchange heat with the cooling oil, and finally returns to the water pump and is cooled by the condenser in the water pump before re-entering the cooling flow path main path. The cooling oil is output by the oil pump, then passes through the area of the motor 13 and carries away the heat, then enters the oil cooler to exchange heat with the water, lowers its temperature with the help of the water, and then returns to the oil pump.

[0055] Figure 3 Specifically, a cooling flow path schematic diagram of another electric drive assembly cooling system is shown, in which the first heat source, i.e. the on-board charger 1, is arranged on one of the cooling flow path branches, the first power module 2 and the second power module 3 are arranged on different cooling flow path branches respectively, and the first power module 2 is located on the same cooling flow path branch as the on-board charger 1. Another electric drive assembly cooling system is shown. Figure 3 The scheme shown is similar to Figure 2 The working principle is not described here again.

[0056] Figure 4Specifically, another cooling flow schematic diagram of the electric drive assembly heat dissipation system is shown, wherein the on-board charger 1 is arranged on one cooling flow branch, and the first power module 2 and the second power module 3 are arranged on the other cooling flow branch. A cooling circuit is formed between the water pump and the oil cooler, and water is used as the cooling medium. Another cooling circuit is formed between the oil pump and the oil cooler, and cooling oil is used as the cooling medium.

[0057] During the operation of the electric drive assembly heat dissipation system, water is output by the water pump, flows along the cooling flow main line first, and then flows along the two cooling flow branches. The water exchanges heat with the on-board charger 1 on the first cooling flow branch, and exchanges heat with the first power module 2 and the second power module 3 on the second cooling flow branch in sequence. Then, the water converges to the cooling flow main line and enters the oil cooler to exchange heat with the cooling oil. Finally, the water returns to the water pump, is cooled by the condenser in the water pump, and then reenters the cooling flow main line. The cooling oil is output by the oil pump, passes through the motor 13 area and carries away heat, and then enters the oil cooler to exchange heat with the water, so as to reduce the temperature of the cooling oil by means of the water. Then, the cooling oil returns to the oil pump.

[0058] In the embodiment of the present application, the cooling flow branches in series and in parallel are combined between the water pump and the oil cooler to respectively dissipate heat of each integrated component on the electric drive assembly, so as to balance the heat dissipation area and the flow rate of the cooling medium, reduce the accumulation of heat in the cooling medium, and improve the heat dissipation efficiency. Compared with the completely parallel cooling flow, the appropriate series connection can reduce the volume of the cooling flow structure, which is beneficial to the miniaturization design of the electric drive assembly, improves the space utilization rate, and reduces the processing cost.

[0059] Optionally, referring to Figure 2 and Figure 3 , the first heat source and the first power module 2 or the second power module 3 are arranged on the same cooling flow branch, and the first power module 2 or the second power module 3 is located on the side of the first heat source close to the outlet of the cooling flow branch along the flow direction of the cooling medium.

[0060] Specifically, the power module is a component with a relatively high heat generation in the electric drive assembly. If the cooling medium flows through the power module first, the temperature of the cooling medium will be too high, which is not conducive to the heat dissipation of the on-board charger 1. Therefore, along the flow direction of the cooling medium, the first heat source, i.e., the on-board charger 1, can be arranged before the first power module 2 or the second power module 3, i.e., the first power module 2 or the second power module 3 is located on the side of the on-board charger 1 closer to the outlet of the cooling flow branch, so as to improve the heat dissipation efficiency of the electric drive assembly.

[0061] Optionally, referring to Figure 5The electric drive assembly heat dissipation system further comprises a motor controller 4, which is arranged on the cooling flow path main path or any of the cooling flow path branch paths.

[0062] Specifically, the motor controller 4 also generates heat during operation, and therefore, the motor controller 4 can also be incorporated into the electric drive assembly heat dissipation system.

[0063] In some embodiments, the motor controller 4 and the on-board charger 1 can be arranged on the same cooling flow path branch path, and the motor controller 4 and the on-board charger 1 can be arranged in any order along the flow direction of the cooling medium. As shown in Figure 5 , the motor controller 4 is arranged after the on-board charger 1.

[0064] In other embodiments, the motor controller 4 can also be arranged on the cooling flow path main path, so that compared with arranging the motor controller 4 on the cooling flow path branch path, the flow rate of the cooling medium can be increased, and the heat dissipation efficiency of the motor controller 4 can be correspondingly improved.

[0065] Optionally, referring to Figure 6 , the motor controller 4 and the first power module 2 or the second power module 3 are arranged on the same cooling flow path branch path, and the first power module 2 or the second power module 3 is arranged on the side of the motor controller 4 close to the outlet of the cooling flow path branch path along the flow direction of the cooling medium.

[0066] Specifically, the motor controller 4 and the second power module 3 are arranged on the same cooling flow path branch path. Since the power module is a component with a relatively high heat generation in the electric drive assembly, if the cooling medium flows through the power module first, the temperature of the cooling medium will be too high, which is not conducive to the heat dissipation of the motor controller 4. Therefore, along the flow direction of the cooling medium, the motor controller 4 can be arranged before the second power module 3. Similarly, when the motor controller 4 is arranged on the cooling flow path main path, the motor controller 4 can also be arranged before any of the power modules, so as to improve the heat dissipation efficiency.

[0067] In other embodiments, the motor controller 4 and the first power module 2 can also be arranged on the same cooling flow path branch path. Since the power module is a component with a relatively high heat generation in the electric drive assembly, if the cooling medium flows through the power module first, the temperature of the cooling medium will be too high, which is not conducive to the heat dissipation of the motor controller 4. Therefore, along the flow direction of the cooling medium, the motor controller 4 can be arranged before the first power module 2.

[0068] Optionally, referring to Figure 7 , the electric drive assembly heat dissipation system further comprises a second heat source, which is arranged on the cooling flow path main path or any of the cooling flow path branch paths.

[0069] Specifically, the second heat source includes but is not limited to an on-board charger, a vehicle controller, a domain controller, a converter, a contactor, an inductor, a capacitor, a power distribution unit or a copper bar. The second heat source of the embodiment preferably adopts the contactor 5. The contactor 5 also generates heat when current passes through, and therefore, the contactor 5 can also be included in the cooling system of the electric drive assembly. The position of the contactor 5 can be flexibly selected, and the contactor 5 can be arranged on the cooling flow main path or the cooling flow branch path. The embodiment of the present application does not limit the position of the contactor 5.

[0070] Figure 7 Specifically, another schematic diagram of a cooling flow path of an electric drive assembly cooling system is shown, in which the on-board charger 1 and the contactor 5 are arranged on the cooling flow main path in sequence, and the first power module 2 and the second power module 3 are arranged on two cooling flow branch paths respectively. A cooling circuit is formed between the water pump and the oil cooler, and water is used as the cooling medium. Another cooling circuit is formed between the oil pump and the oil cooler, and cooling oil is used as the cooling medium.

[0071] When the electric drive assembly cooling system works, water is output by the water pump, flows along the cooling flow main path first, cools the on-board charger 1 and the contactor 5 in sequence, then flows through the two cooling flow branch paths and exchanges heat with the first power module 2 and the second power module 3 respectively, then converges to the cooling flow main path and enters the oil cooler to exchange heat with the cooling oil, and finally returns to the water pump and is cooled by the condenser in the water pump before re-entering the cooling flow main path. The cooling oil is output by the oil pump, then passes through the motor 13 area and carries away heat, then enters the oil cooler to exchange heat with water, and then returns to the oil pump.

[0072] Optionally, referring to Figure 8 , the electric drive assembly cooling system further comprises a third heat source arranged on the cooling flow main path or any of the cooling flow branch paths.

[0073] Specifically, the third heat source includes but is not limited to an on-board charger, a vehicle controller, a domain controller, a converter, a contactor, an inductor, a capacitor, a power distribution unit or a copper bar. The third heat source of the embodiment preferably adopts the inductor 6. The inductor 6 also generates heat when current passes through, and therefore, the inductor 6 can also be included in the electric drive assembly cooling system. The position of the inductor 6 can be flexibly selected, and the inductor 6 can be arranged on the cooling flow main path or the cooling flow branch path. The embodiment of the present application does not limit the position of the inductor 6.

[0074] Figure 8Another cooling flow schematic diagram of the electric drive assembly cooling system is specifically shown, wherein the on-board charger 1 and the contactor 5 are sequentially arranged on the cooling flow main path, the first power module 2 and the second power module 3 are respectively arranged on two cooling flow branch paths, and the inductor 6 is arranged on the cooling flow main path between the oil cooler and the power module. A cooling loop is formed between the water pump and the oil cooler, and water is used as the cooling medium. Another cooling loop is formed between the oil pump and the oil cooler, and cooling oil is used as the cooling medium.

[0075] During the operation of the electric drive assembly cooling system, water is output by the water pump, flows along the cooling flow main path first, sequentially cools the on-board charger 1 and the contactor 5, then flows through the two cooling flow branch paths and exchanges heat with the first power module 2 and the second power module 3 respectively, then converges to the cooling flow main path and exchanges heat with the inductor 6, then enters the oil cooler and exchanges heat with the cooling oil, and finally returns to the water pump and is cooled by the condenser in the water pump before re-entering the cooling flow main path. The cooling oil is output by the oil pump, then passes through the motor 13 area and carries away heat, then enters the oil cooler and exchanges heat with the water, then returns to the oil pump by means of the water to reduce its own temperature.

[0076] Optionally, referring to Figure 9 , the electric drive assembly cooling system further comprises a fourth heat source, and the power distribution unit 7 is arranged on the cooling flow main path or any of the cooling flow branch paths.

[0077] Specifically, the fourth heat source includes but is not limited to the on-board charger, the vehicle controller, the domain controller, the converter, the contactor, the inductor, the capacitor, the power distribution unit or the copper bar. The fourth heat source of the embodiment preferably adopts the power distribution unit 7. The power distribution unit 7 also generates heat when current passes through, so the power distribution unit 7 can also be included in the electric drive assembly cooling system. The position of the power distribution unit 7 can be flexibly selected, and it can be arranged on the cooling flow main path or the cooling flow branch path, which is not limited in the embodiment.

[0078] In addition, compared with the power module, the power distribution unit 7 generates less heat, and when it is arranged on the same cooling flow branch path as the power module, along the flow direction of the cooling medium, the power distribution unit 7 can be placed before the power module.

[0079] Optionally, referring to Figure 9 , the fourth heat source and the first heat source are located on the same cooling flow branch path, and along the flow direction of the cooling medium, the fourth heat source is located on the side of the first heat source close to the inlet of the cooling flow branch path.

[0080] Specifically, the power distribution unit 7 has a lower heat generation than the on-board charger 1, and if the cooling medium first flows through the on-board charger 1, the temperature of the cooling medium will be too high, which is not conducive to heat dissipation of the power distribution unit 7. Therefore, when the power distribution unit 7 and the on-board charger 1 are arranged on the same cooling flow path branch, the power distribution unit 7 can be arranged before the on-board charger 1, that is, the power distribution unit 7 is closer to the inlet of the cooling flow path branch.

[0081] Optionally, referring to Figure 10 , the electric drive assembly heat dissipation system further comprises a fifth heat source, and the fifth heat source is arranged on the cooling flow path main path or any of the cooling flow path branches.

[0082] Specifically, the fifth heat source includes but is not limited to the on-board charger, the vehicle controller, the domain controller, the converter, the contactor, the inductor, the capacitor, the power distribution unit or the copper bar. The fifth heat source of the embodiment preferably adopts the copper bar 8. The copper bar 8 also generates heat when current passes through, so the copper bar 8 can also be included in the electric drive assembly heat dissipation system. The position of the copper bar 8 can be flexibly selected, and it can be arranged on the cooling flow path main path or the cooling flow path branch. The embodiment of the present application does not limit it.

[0083] In addition, compared with the power module, the copper bar 8 has a lower heat generation, and along the flow direction of the cooling medium, the copper bar 8 can be placed before the power module.

[0084] Figure 10 Specifically, another cooling flow path schematic diagram of the electric drive assembly heat dissipation system is shown, wherein the on-board charger 1 and the copper bar 8 are arranged on two cooling flow path branches between the water pump and the contactor 5, the contactor 5 and the inductor 6 are arranged on the cooling flow path main path in sequence, and the first power module 2 and the second power module 3 are arranged on two cooling flow path branches between the contactor 5 and the inductor 6.

[0085] Optionally, referring to Figure 11 , the first heat source includes a first capacitor 9, and the first capacitor 9 is arranged on any of the cooling flow path branches.

[0086] Specifically, the first capacitor 9 in the on-board charger 1 is a component with a higher heat generation, which can be separated from the body of the on-board charger 1 for separate heat dissipation, thereby improving the heat dissipation efficiency.

[0087] Optionally, referring to Figure 10 , the first heat source further includes a third power module 10, wherein one of the cooling flow path branches includes at least two cooling flow path sub-branches arranged in parallel, and the third power module 10 and the first capacitor 9 are arranged on different cooling flow path sub-branches.

[0088] Specifically, the third power module 10 in the vehicle charger 1 is a component with high heat generation, which can be separated from the body of the vehicle charger 1 to be cooled separately, so as to improve the cooling efficiency.

[0089] As shown in Figure 12 , when the third power module 10 and the first capacitor 9 are arranged on the same cooling flow branch, the cooling flow branch can be split into two parallel cooling flow sub-branches, and the third power module 10 and the first capacitor 9 are arranged on the two cooling flow sub-branches respectively, so as to avoid the mutual influence of the third power module 10 and the first capacitor 9, and improve the cooling efficiency of the third power module 10 and the first capacitor 9 respectively.

[0090] Optionally, referring to Figure 11 and Figure 12 , one of the cooling flow branches includes at least two parallel cooling flow sub-branches, and the first power module 2 and the second power module 3 are arranged on different cooling flow sub-branches respectively.

[0091] Specifically, when the first power module 2 and the second power module 3 are located on the same cooling flow branch, the cooling flow branch can be split into two parallel cooling flow sub-branches, and then the first power module 2 and the second power module 3 are arranged on the two cooling flow sub-branches respectively, so as to avoid the mutual influence of the first power module 2 and the second power module 3, and improve the cooling efficiency of the third power module 10 and the first capacitor 9 respectively.

[0092] Optionally, the electric drive assembly cooling system further includes a first driving member 11, an outlet of the first driving member 11 is communicated with an inlet of the cooling flow main branch, and the first driving member 11 is used to drive the cooling medium to flow.

[0093] Specifically, the first driving member 11 can be selected flexibly according to the type of the cooling medium, for example, when the cooling medium is air, the first driving member 11 can be a circulating fan; in the above embodiment, the cooling medium is water, so the first driving member 11 is selected as a water pump.

[0094] Optionally, the electric drive assembly cooling system further includes a heat exchanger 12, a first inlet of the heat exchanger 12 is communicated with an outlet of the cooling flow main branch, and a first outlet of the heat exchanger 12 is communicated with an inlet of the first driving member 11.

[0095] Specifically, the type of the heat exchanger 12 can be selected flexibly according to the type of the cooling medium, which is not limited in the embodiment. In the above embodiment, the cooling medium is selected as water and cooling oil, so the heat exchanger 12 is selected as an oil cooler.

[0096] In addition, the heat exchanger 12 can be one or multiple, and the heat exchange efficiency between the water and the cooling oil can be improved by increasing the number of the heat exchanger 12. Those skilled in the art can select flexibly according to specific requirements, and the embodiments of the present application do not limit them.

[0097] Optionally, the electric drive assembly cooling system further comprises a motor 13 and a second driving member 14, the outlet of the second driving member 14 and the second inlet of the heat exchanger 12 are communicated, the inlet of the second driving member 14 and the second outlet of the heat exchanger 12 are communicated, and the motor 13 is arranged on the cooling flow path between the outlet of the second driving member 14 and the second inlet of the heat exchanger 12.

[0098] Specifically, the second driving member 14 can be selected flexibly according to the type of the cooling medium, for example, when the cooling medium is air, the second driving member 14 can be a circulating fan; in the above embodiment, the cooling medium is cooling oil, and therefore the second driving member 14 can be selected as an oil pump.

[0099] In addition, the number of the motor 13 can be one or two, and those skilled in the art can select flexibly according to requirements, and the embodiments of the present application do not limit them.

[0100] Figure 13 Specifically, the electric drive assembly cooling system disclosed in the present application adopts two motors 13, the cooling oil is output by an oil pump, and the two motors 13 are cooled by two paths respectively.

[0101] In addition, as shown in Figure 14 and Figure 15 the present application further provides a distribution scheme of an internal cooling flow path of a power module. The power module comprises a plurality of groups of upper bridges and lower bridges, the upper bridges and the lower bridges are supplied with external current, and therefore heat is easily generated, and the upper bridges and the lower bridges need to be cooled.

[0102] Figure 14 In the above embodiment, each group of the upper bridges and the lower bridges is distributed on the cooling flow paths in parallel with each other, and since the heat generated by the upper bridges is generally less than that generated by the lower bridges, if the cooling medium flows through the lower bridges first, the temperature of the cooling medium will be too high, which is not conducive to the heat dissipation of the upper bridges. Therefore, along the flow direction of the cooling medium, the upper bridges can be arranged before the lower bridges.

[0103] Figure 15 In the above embodiment, a plurality of upper bridges are arranged on the same cooling flow path, and a plurality of lower bridges are arranged on another cooling flow path, so that the upper bridges and the lower bridges do not affect each other during heat dissipation, and the heat dissipation efficiency is improved.

[0104] The embodiments of the present application further provide an electric drive assembly comprising the above electric drive assembly cooling system.

[0105] Specifically, the electric drive assembly heat dissipation system is applied to the electric drive assembly, each integrated component on the electric drive assembly is respectively cooled by means of the cooling flow path combined in series and parallel, the heat dissipation area and the flow rate of the cooling medium are balanced, the heat accumulation in the cooling medium is reduced, and the heat dissipation efficiency is improved; compared with the completely parallel cooling flow path, the appropriate series connection can reduce the volume of the cooling flow path structure, is conducive to the miniaturization design of the electric drive assembly, improves the space utilization rate, and reduces the processing cost.

[0106] The embodiment of the present application also provides a vehicle comprising the electric drive assembly.

[0107] Specifically, the electric drive assembly is applied to the vehicle, each integrated component on the electric drive assembly is respectively cooled by means of the cooling flow path combined in series and parallel, the heat dissipation area and the flow rate of the cooling medium are balanced, the heat accumulation in the cooling medium is reduced, and the heat dissipation efficiency of the electric drive assembly is improved, so that the power performance of the vehicle is improved; compared with the completely parallel cooling flow path, the appropriate series connection can reduce the volume of the cooling flow path structure, is conducive to the miniaturization design of the electric drive assembly, and saves the cost.

[0108] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0109] The above only describes the preferred embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. An electric drive assembly cooling system, comprising: The first heat source, the first power module, the second power module, the cooling flow path trunk and at least two parallel cooling flow path branches; The cooling flow path trunk is communicated with each of the cooling flow path branches, and part or all of the first heat source, the first power module and the second power module are arranged on the cooling flow path branches and / or the cooling flow path trunk to balance the heat dissipation area of the cooling flow path and the flow rate of the cooling medium in the cooling flow path.

2. The electric drive assembly heat sink system of claim 1, wherein, When the first heat source is arranged on the cooling flow path trunk, the first power module and the second power module are arranged on different cooling flow path branches, respectively. When the first heat source is arranged on one of the cooling flow path branches, the first power module and the second power module are arranged on different cooling flow path branches, respectively, and one of the power modules and the first heat source are arranged on the same cooling flow path branch, or the first power module and the second power module are arranged on another cooling flow path branch simultaneously.

3. The electric drive assembly heat sink system of claim 2, wherein, The first heat source and the first power module or the second power module are arranged on the same cooling flow path branch, and along the flow direction of the cooling medium, the first power module or the second power module is located on the side of the first heat source close to the outlet of the cooling flow path branch.

4. The electric drive assembly heat sink system of claim 1, wherein, The electric drive assembly cooling system further comprises a motor controller, and the motor controller is arranged on the cooling flow path trunk or any of the cooling flow path branches.

5. The electric drive assembly heat sink system of claim 4, wherein, The motor controller and the first power module or the second power module are arranged on the same cooling flow path branch, and along the flow direction of the cooling medium, the first power module or the second power module is located on the side of the motor controller close to the outlet of the cooling flow path branch.

6. The electric drive assembly heat sink system of claim 1, wherein, The electric drive assembly cooling system further comprises a second heat source, and the second heat source is arranged on the cooling flow path trunk or any of the cooling flow path branches.

7. The electric drive assembly heat sink system of claim 1, wherein, The electric drive assembly cooling system further comprises a third heat source, and the third heat source is arranged on the cooling flow path trunk or any of the cooling flow path branches.

8. The electric drive assembly heat sink system of claim 1, wherein, The electric drive assembly cooling system further comprises a fourth heat source, and the fourth heat source is arranged on the cooling flow path trunk or any of the cooling flow path branches.

9. The electric drive assembly heat sink system of claim 8, wherein, The fourth heat source and the first heat source are arranged on the same cooling flow path branch, and along the flow direction of the cooling medium, the fourth heat source is located on the side of the first heat source close to the inlet of the cooling flow path branch.

10. The electric drive assembly heat sink system of claim 1, wherein, The electric drive assembly cooling system further comprises a fifth heat source, and the fifth heat source is arranged on the cooling flow path trunk or any of the cooling flow path branches.

11. The electric drive assembly heat sink system of claim 1, wherein, The first heat source comprises a first capacitor, and the first capacitor is arranged on the cooling flow path trunk or any of the cooling flow path branches.

12. The electric drive assembly heat sink system of claim 11, wherein, The first heat source further comprises a third power module, one of the cooling flow path branches comprises at least two cooling flow path sub-branches arranged in parallel, and the third power module and the first capacitor are arranged on different cooling flow path sub-branches, respectively.

13. The electric drive assembly heat sink system of claim 1, wherein, One of the cooling flow path branches includes at least two cooling flow path sub-branches arranged in parallel, and the first power module and the second power module are arranged on different cooling flow path sub-branches.

14. The electric drive assembly heat sink system of any one of claims 1-13, wherein, The electric drive assembly cooling system further comprises a first driving member, an outlet of the first driving member being communicated with an inlet of the cooling flow path main path, and the first driving member being used for driving the cooling medium to flow.

15. The electric drive assembly heat sink system of claim 14, wherein, The electric drive assembly cooling system further comprises a heat exchanger, a first inlet of the heat exchanger being communicated with an outlet of the cooling flow path main path, and a first outlet of the heat exchanger being communicated with an inlet of the first driving member.

16. The electric drive assembly heat sink system of claim 15, wherein, The electric drive assembly cooling system further comprises a motor and a second driving member, an outlet of the second driving member being communicated with a second inlet of the heat exchanger, and an inlet of the second driving member being communicated with a second outlet of the heat exchanger, and the motor being arranged on the cooling flow path between the outlet of the second driving member and the second inlet of the heat exchanger.

17. An electric drive assembly, characterized by The electric drive assembly cooling system comprises any one of claims 1-16.

18. A vehicle characterized by comprising: The electric drive assembly comprises claim 17.

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