Cooling system, motor controller and electric driving system

Abstract

The utility model discloses a cooling system, a motor controller and an electric driving system, and relates to the technical field of automobile power assemblies, and the cooling system comprises a heat dissipation assembly and a liquid blocking piece; the heat dissipation assembly is provided with a liquid inlet, a liquid outlet and a heat dissipation channel. The liquid blocking part is arranged in the heat dissipation channel to divide the heat dissipation channel into a first liquid path, a second liquid path and a third liquid path which are connected in series, the water inlet end of the first liquid path communicates with the liquid inlet, the water inlet end of the third liquid path communicates with the water outlet end of the first liquid path through the second liquid path, and the water outlet end of the third liquid path communicates with the liquid outlet. According to the technical scheme, the risk that cooling liquid leaks outwards can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile power assembly, in particular to a cooling system, a motor controller and an electric drive system. Background Art

[0002] In the layout of the motor controller, a sealed cavity is formed between the water channel cover and the water channel substrate of its cooling system by stir friction welding. The stir friction welding is exposed outside the sealed water channel. Once the connection between the water channel cover and the water channel substrate fails, the seal is likely to fail, resulting in the risk of coolant leakage. Utility Model Content

[0003] The main purpose of the utility model is to provide a cooling system, a motor controller and an electric drive system, aiming to reduce the risk of cooling liquid leaking out.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a cooling system, comprising:

[0005] A heat dissipation component, wherein the heat dissipation component is provided with a liquid inlet, a liquid outlet and a heat dissipation channel;

[0006] A liquid blocking component is arranged in the heat dissipation channel to divide the heat dissipation channel into a first liquid circuit, a second liquid circuit and a third liquid circuit connected in series, the water inlet end of the first liquid circuit is connected to the liquid inlet, the water inlet end of the third liquid circuit is connected to the water outlet end of the first liquid circuit through the second liquid circuit, and the water outlet end of the third liquid circuit is connected to the liquid outlet.

[0007] In one embodiment, the first liquid path, the second liquid path, and the third liquid path are sequentially spaced from top to bottom.

[0008] In one embodiment, the heat dissipation assembly has a first slot body and a second slot body on opposite sides thereof;

[0009] The liquid baffle member includes a first liquid baffle plate and a second liquid baffle plate, the first liquid baffle plate is arranged in the first groove body, the first plate surface of the first liquid baffle plate and the groove wall of the first groove body are combined to form the first liquid path, the second plate surface of the first liquid baffle plate and the groove bottom and groove wall of the first groove body are combined to form the second liquid path, and the second liquid baffle plate is arranged in the second groove body and is combined with the groove bottom and groove wall of the second groove body to form the third liquid path.

[0010] In one embodiment, a first communication port is formed between one side of the first liquid baffle plate and the groove wall of the first groove body, and the first communication port is connected with the liquid inlet and the first liquid path;

[0011] A first connecting groove is formed between the other side of the first liquid baffle plate and the groove wall of the first groove body, and the first connecting groove connects the water outlet end of the first liquid path and the water inlet end of the second liquid path;

[0012] The first communication port and the first communication groove are respectively arranged on two opposite sides of the first liquid baffle plate.

[0013] In one embodiment, a second connecting groove penetrating to the second groove body is provided at the bottom of the first groove body, and the second connecting groove connects the water outlet end of the second liquid path and the water inlet end of the third liquid path.

[0014] In one embodiment, the second communicating groove is disposed away from the first communicating groove.

[0015] In one embodiment, a first supporting portion is disposed at the bottom of the first tank body, and the first liquid baffle plate is carried by the first supporting portion.

[0016] In one embodiment, a recessed portion is provided at the bottom of the second groove body, a second supporting portion is provided at the recessed portion, and the second liquid baffle plate is carried on the second supporting portion.

[0017] In one embodiment, a second communication port is formed between one side of the second liquid baffle plate and the side wall of the recessed portion, and the second communication port is connected with the third liquid path and the liquid outlet;

[0018] And / or, a plate surface of the second liquid baffle plate away from the second supporting portion is flush with the bottom of the second trough body.

[0019] In one embodiment, the liquid inlet and the liquid outlet are disposed on two opposite sides of the heat dissipation component.

[0020] In one embodiment, the cooling system further includes a first heating device and a second heating device, wherein the first heating device is disposed above the heat dissipation component and is in thermal contact with the coolant flowing through the first liquid path, and the second heating device is disposed below the heat dissipation component and is in thermal contact with the coolant flowing through the third liquid path.

[0021] In one embodiment, a first sealing ring is provided between the first heating device and the heat dissipation assembly;

[0022] And / or, a second sealing ring is provided between the second heating device and the heat dissipation assembly.

[0023] The utility model also provides a motor controller, comprising the cooling system as described above.

[0024] The utility model also provides an electric drive system, comprising the motor controller as described above.

[0025] The technical solution of the utility model is to provide a liquid blocking member in the heat dissipation channel of the heat dissipation component, so as to divide the heat dissipation channel into a first liquid circuit, a second liquid circuit and a third liquid circuit which are connected in series through the liquid blocking member, so that the first liquid circuit, the second liquid circuit and the third liquid circuit form an S-shaped water channel, and the coolant enters from the liquid inlet, and flows through the first liquid circuit, the second liquid circuit and the third liquid circuit in sequence, and finally flows out from the liquid outlet. In this process, when the coolant flows through the first liquid circuit, it can take away the heat generated by the device in thermal contact with the coolant of the first liquid circuit, and when the coolant flows through the third liquid circuit, it can take away the heat generated by the device in thermal contact with the coolant of the third liquid circuit, so as to achieve a water-cooled heat dissipation effect.

[0026] Among them, since the liquid blocking member is arranged inside the heat dissipation channel, even if the connection between the liquid blocking member and the heat dissipation component fails, the liquid will only flow inside the heat dissipation channel and will not leak outward, thereby reducing the risk of coolant leakage outward.

[0027] In addition, compared with the common parallel liquid circuit design, the series connection liquid circuit design adopted in this solution can also reduce the flow resistance of the system, thereby reducing the application cost of the vehicle cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 An exploded view of an embodiment of a cooling system provided by the utility model when it cooperates with a first heating device and a second heating device;

[0030] Figure 2 A cross-sectional view of an embodiment of a cooling system provided by the utility model when it cooperates with a first heating device and a second heating device.

[0031] Description of Figure Numbers:

[0032] 100. Cooling system; 10. Heat dissipation component; 11. Liquid inlet; 12. Liquid outlet; 13. Heat dissipation channel; 131. First liquid path; 132. Second liquid path; 133. Third liquid path; 134. First connecting port; 135. First connecting groove; 136. Second connecting groove; 137. Second connecting port; 14. First supporting portion; 15. Recessed portion; 16. Second supporting portion; 20. Liquid retaining member; 21. First liquid retaining plate; 22. Second liquid retaining plate; 30. First heating device; 40. Second heating device; 50. First sealing ring; 60. Second sealing ring.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] In the layout of the motor controller, a sealed cavity is formed between the water channel cover and the water channel substrate of its cooling system by stir friction welding. The stir friction welding is exposed outside the sealed water channel. Once the connection between the water channel cover and the water channel substrate fails, the seal is likely to fail, resulting in the risk of coolant leakage.

[0038] Based on the above problems, the utility model proposes a cooling system, aiming to reduce the risk of cooling liquid leaking out.

[0039] See also Figure 1 and Figure 2 In one embodiment of the utility model, the cooling system 100 includes a heat dissipation component 10 and a liquid blocking component 20; the heat dissipation component 10 is provided with a liquid inlet 11, a liquid outlet 12 and a heat dissipation channel 13; the liquid blocking component 20 is arranged in the heat dissipation channel 13 to divide the heat dissipation channel 13 into a first liquid path 131, a second liquid path 132 and a third liquid path 133 connected in series, the water inlet end of the first liquid path 131 is connected to the liquid inlet 11, the water inlet end of the third liquid path 133 is connected to the water outlet end of the first liquid path 131 through the second liquid path 132, and the water outlet end of the third liquid path 133 is connected to the liquid outlet 12.

[0040] The technical solution of the utility model is to provide a liquid blocking member 20 in the heat dissipation channel 13 of the heat dissipation component 10, so as to divide the heat dissipation channel 13 into a first liquid path 131, a second liquid path 132 and a third liquid path 133 connected in series through the liquid blocking member 20, so that the first liquid path 131, the second liquid path 132 and the third liquid path 133 form an S-shaped water channel, and the coolant enters from the liquid inlet 11, and flows through the first liquid path 131, the second liquid path 132 and the third liquid path 133 in sequence, and finally flows out from the liquid outlet 12. In this process, when the coolant flows through the first liquid path 131, it can take away the heat generated by the device in thermal contact with the coolant of the first liquid path 131, and when the coolant flows through the third liquid path 133, it can take away the heat generated by the device in thermal contact with the coolant of the third liquid path 133, so as to achieve a water-cooled heat dissipation effect.

[0041] Among them, since the liquid blocking member 20 is arranged inside the heat dissipation channel 13, even if the connection between the liquid blocking member 20 and the heat dissipation component 10 fails, the liquid will only flow inside the heat dissipation channel 13 and will not leak out, thereby reducing the risk of coolant leakage.

[0042] In addition, compared with the common parallel liquid circuit design, the series connection liquid circuit design adopted in this solution can also reduce the flow resistance of the system, thereby reducing the application cost of the vehicle cooling system 100.

[0043] In actual application, the first liquid path 131 , the second liquid path 132 and the third liquid path 133 may be distributed with intervals up and down, left and right, or front and back.

[0044] In one embodiment, the first liquid path 131 , the second liquid path 132 , and the third liquid path 133 are sequentially spaced from top to bottom.

[0045] With such an arrangement, the upper and lower layers of devices can be water-cooled by the first liquid circuit 131 and the third liquid circuit 133, respectively, to achieve a double-sided three-dimensional water-cooling effect, so that the stacked arrangement of devices (such as power modules) can be realized, so that the volume occupied by the cooling system 100 in the length direction can be reduced; at the same time, by arranging the liquid blocking member 20 inside the heat dissipation channel 13, the water channel design can be made smaller, the power density is improved, and the volume can be further reduced and the cost can be reduced. That is, for an electric drive system with a dual power module design, the stacked double-slot design can greatly reduce the length direction compared to the previous single-sided liquid cooling design with two power modules laid flat, reduce costs, and improve the competitiveness of the solution.

[0046] In actual application, the liquid inlet 11 and the liquid outlet 12 can be arranged on different sides of the heat dissipation component 10 , such as two opposite sides or two adjacent sides, or can be arranged on the same side of the heat dissipation component 10 .

[0047] As some exemplary embodiments, a water inlet and a water outlet may be provided on the same side or different sides of the heat dissipation component 10 , wherein the water inlet is provided with a liquid inlet 11 , and the water outlet is provided with a liquid outlet 12 .

[0048] In actual application, the liquid blocking component 20 may specifically include one liquid blocking plate, or may include two or more liquid blocking plates, as long as the liquid blocking component 20 can separate the heat dissipation channel 13 into a first liquid path 131, a second liquid path 132 and a third liquid path 133 connected in series.

[0049] It should be noted that the liquid flowing through the heat dissipation channel 13 is not specifically limited, and can be, for example, liquid, oil, or other liquids with heat dissipation effect. Of course, the heat dissipation channel 13 can also be used to flow through a gas with a cooling effect.

[0050] See also Figure 2In one embodiment of the utility model, a first trough body and a second trough body are respectively provided on opposite sides of the heat dissipation assembly 10; the liquid blocking member 20 includes a first liquid blocking plate 21 and a second liquid blocking plate 22, the first liquid blocking plate 21 is arranged in the first trough body, the first plate surface of the first liquid blocking plate 21 and the trough wall of the first trough body are combined to form a first liquid path 131, the second plate surface of the first liquid blocking plate 21 and the trough bottom and trough wall of the first trough body are combined to form a second liquid path 132, the second liquid blocking plate 22 is arranged in the second trough body, and is combined with the trough bottom and trough wall of the second trough body to form a third liquid path 133.

[0051] With such an arrangement, the first liquid baffle plate 21 and the second liquid baffle plate 22 can be respectively installed in the first tank body and the second water channel, which makes it easier to install the liquid baffle 20 and can better separate the heat dissipation channel 13 into the first liquid path 131, the second liquid path 132 and the third liquid path 133 connected in series.

[0052] As some exemplary examples, the second liquid baffle plate 22 can be an integrally formed structure with the heat dissipation component 10, and the first liquid baffle plate 21 can be subsequently assembled in the first water channel. Specifically, the first liquid baffle plate 21 can be fixed to the heat dissipation component 10 by gluing, welding, etc.

[0053] In actual application, the first liquid path 131 and the second liquid path 132 can be connected through the connecting groove between the first liquid baffle plate 21 and the first tank body, or through a groove on the first liquid baffle plate 21. The second liquid path 132 and the third liquid path 133 can be connected through the connecting groove between the second liquid baffle plate 22 and the second tank body, or through a groove on the second liquid baffle plate 22 or the heat dissipation assembly 10.

[0054] See also Figure 2 In one embodiment of the utility model, a first connecting port 134 is formed between one side of the first liquid baffle plate 21 and the groove wall of the first groove body, and the first connecting port 134 connects the liquid inlet 11 and the first liquid path 131; a first connecting groove 135 is formed between the other side of the first liquid baffle plate 21 and the groove wall of the first groove body, and the first connecting groove 135 connects the water outlet end of the first liquid path 131 and the water inlet end of the second liquid path 132; the first connecting port 134 and the first connecting groove 135 are respectively arranged on two opposite sides of the first liquid baffle plate 21.

[0055] With such arrangement, when the coolant enters from the liquid inlet 11, it can enter the first liquid path 131 through the first communication port 134, then enter the second liquid path 132 through the first communication groove 135, and then introduce the coolant into the third liquid path 133 through the second liquid path 132, and finally flow out from the liquid outlet 12. Such a design does not require the arrangement of an additional communication structure, nor does it require the addition of additional processes to achieve the communication between the liquid inlet 11 and the first liquid path 131, and between the first liquid path 131 and the second liquid path 132. In addition, by arranging the first communication port 134 and the first communication groove 135 on both sides of the first liquid baffle 21, the flow path of the first liquid path 131 can be made longer, the heat dissipation area between the device can be increased, and more devices can be cooled.

[0056] See also Figure 2 In one embodiment of the utility model, a second connecting groove 136 penetrating into the second groove body is provided at the bottom of the first groove body, and the second connecting groove 136 connects the water outlet end of the second liquid path 132 and the water inlet end of the third liquid path 133 .

[0057] With such arrangement, the coolant flowing through the second liquid path 132 can enter the third liquid path 133 through the second connecting groove 136 and finally flow out from the liquid outlet 12. Such a design can achieve the connection between the second liquid path 132 and the third liquid path 133 without setting up an additional connecting structure.

[0058] In actual application, the second communicating groove 136 can be arranged close to the first communicating groove 135 , or close to the middle of the first liquid baffle plate 21 .

[0059] See also Figure 2 In one embodiment of the present invention, the second connecting groove 136 is arranged away from the first connecting groove 135 .

[0060] This arrangement can make the water flow direction a Figure 2 As shown, the flow path of the second liquid path 132 is made longer, so that the first liquid path 131 and the third liquid path 133 are effectively separated by the second liquid path 132 .

[0061] See also Figure 2 In one embodiment of the utility model, a first supporting portion 14 is provided at the bottom of the first tank body, and the first liquid baffle plate 21 is carried by the first supporting portion 14 .

[0062] In this configuration, by supporting the first liquid baffle plate 21 on the first support portion 14 , the installation reliability of the first liquid baffle plate 21 can be improved.

[0063] As some exemplary embodiments, the first liquid baffle plate 21 may be fixed to the first support portion 14 by gluing, welding or the like.

[0064] See also Figure 2 In one embodiment of the utility model, a recessed portion 15 is provided at the bottom of the second groove body, a second supporting portion 16 is provided at the recessed portion 15 , and the second liquid retaining plate 22 is carried on the second supporting portion 16 .

[0065] In this configuration, by supporting the second liquid baffle plate 22 on the second support portion 16 , the installation reliability of the second liquid baffle plate 22 can be improved.

[0066] As some exemplary embodiments, the second liquid baffle plate 22 may be integrally formed on the second supporting portion 16 .

[0067] See also Figure 2 In one embodiment of the present invention, a second communication port 137 is formed between one side of the second liquid baffle plate 22 and the side wall of the recessed portion 15 , and the second communication port 137 is connected to the third liquid path 133 and the liquid outlet 12 .

[0068] With such arrangement, the coolant flowing through the third liquid path 133 can flow to the liquid outlet 12 through the second connecting port 137 and finally flow out from the liquid outlet 12. Such a design does not require the arrangement of an additional connecting structure or the addition of additional processes to achieve the connection between the third liquid path 133 and the liquid outlet 12.

[0069] As some exemplary embodiments, the second communication port 137 is disposed away from the second communication groove 136 , so that the flow path of the third liquid path 133 can be longer, the heat dissipation area between the device and the device can be increased, and more devices can be cooled.

[0070] See also Figure 2 In one embodiment of the utility model, the plate surface of the second liquid baffle plate 22 away from the second support portion 16 is flush with the bottom of the second tank body, so that when the coolant flows through the third liquid path 133, the coolant can flow quickly to the liquid outlet 12.

[0071] See also Figure 1 and Figure 2 In one embodiment of the present invention, the liquid inlet 11 and the liquid outlet 12 are disposed on two opposite sides of the heat dissipation component 10 .

[0072] Such an arrangement allows the coolant entering from the liquid inlet 11 to pass through a longer S-shaped water channel and finally flow out from the liquid outlet 12. This allows the coolant to have a longer flow path through the S-shaped water channel, increases the heat dissipation area between the components, and can dissipate heat for more components.

[0073] In actual application, the directions of the liquid inlet 11 and the liquid outlet 12 may be the same or different.

[0074] See also Figure 1 and Figure 2In one embodiment of the utility model, the cooling system 100 also includes a first heating device 30 and a second heating device 40. The first heating device 30 is arranged above the heat dissipation component 10 and is in thermal contact with the coolant flowing through the first liquid path 131. The second heating device 40 is arranged below the heat dissipation component 10 and is in thermal contact with the coolant flowing through the third liquid path 133.

[0075] With such a configuration, when the coolant flows through the first liquid path 131 , it can be in thermal contact with the first heating device 30 to take away the heat generated by the first heating device 30 , and when the coolant flows through the third liquid path 133 , it can be in thermal contact with the second heating device 40 to take away the heat generated by the second heating device 40 .

[0076] In actual application, the first heating device 30 may include one or at least two. When the first heating device 30 includes at least two, the at least two first heating devices 30 may be distributed along the extension direction of the first liquid path 131. Similarly, the second heating device 40 may include one or at least two. When the second heating device 40 includes at least two, the at least two second heating devices 40 may be distributed along the extension direction of the third liquid path 133.

[0077] As some exemplary embodiments, the first heat generating device 30 and the second heat generating device 40 may be power modules.

[0078] See also Figure 1 In one embodiment of the utility model, a first sealing ring 50 is provided between the first heating device 30 and the heat dissipation component 10; in this way, the first sealing ring 50 can improve the sealing between the first heating device 30 and the heat dissipation component 10 to prevent the coolant flowing through the first liquid path 131 from leaking out from the gap between the first heating device 30 and the heat dissipation component 10.

[0079] As some examples, in order to improve the installation reliability of the first sealing ring 50, a first sealing groove can be provided on the top of the heat dissipation assembly 10, and the first sealing groove is arranged around the first liquid path 131 so that the first sealing ring 50 can be partially installed in the first sealing groove.

[0080] See also Figure 1 In one embodiment of the utility model, a second sealing ring 60 is provided between the second heating device 40 and the heat dissipation component 10; in this way, the second sealing ring 60 can improve the sealing between the second heating device 40 and the heat dissipation component 10 to prevent the coolant flowing through the third liquid path 133 from leaking out from the gap between the second heating device 40 and the heat dissipation component 10.

[0081] As some examples, in order to improve the installation reliability of the second sealing ring 60, a second sealing groove can be provided at the bottom of the heat dissipation assembly 10, and the second sealing groove is arranged around the third liquid path 133 so that the second sealing ring 60 can be partially installed in the second sealing groove.

[0082] The utility model also proposes a motor controller, which includes a cooling system 100. The specific structure of the cooling system 100 refers to the above embodiment. Since the motor controller adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0083] The utility model also proposes an electric drive system, which includes a motor controller. The specific structure of the motor controller refers to the above-mentioned embodiment. Since the electric drive system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0084] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooling system, characterized in that: include: A heat dissipation component, wherein the heat dissipation component is provided with a liquid inlet, a liquid outlet and a heat dissipation channel; A liquid blocking member is arranged in the heat dissipation channel to divide the heat dissipation channel into a first liquid path, a second liquid path and a third liquid path connected in series, the liquid inlet end of the first liquid path is connected to the liquid inlet, the liquid inlet end of the third liquid path is connected to the liquid outlet end of the first liquid path through the second liquid path, and the liquid outlet end of the third liquid path is connected to the liquid outlet.

2. The cooling system according to claim 1, characterized in that The first liquid path, the second liquid path and the third liquid path are sequentially spaced from top to bottom.

3. The cooling system according to claim 2, characterized in that The heat dissipation component is provided with a first slot body and a second slot body on opposite sides thereof; The liquid baffle member includes a first liquid baffle plate and a second liquid baffle plate, the first liquid baffle plate is arranged in the first groove body, the first plate surface of the first liquid baffle plate and the groove wall of the first groove body are combined to form the first liquid path, the second plate surface of the first liquid baffle plate and the groove bottom and groove wall of the first groove body are combined to form the second liquid path, and the second liquid baffle plate is arranged in the second groove body and is combined with the groove bottom and groove wall of the second groove body to form the third liquid path.

4. The cooling system according to claim 3, characterized in that A first communication port is formed between one side of the first liquid baffle plate and the groove wall of the first groove body, and the first communication port is connected with the liquid inlet and the first liquid path; A first connecting groove is formed between the other side of the first liquid baffle plate and the groove wall of the first groove body, and the first connecting groove connects the water outlet end of the first liquid path and the water inlet end of the second liquid path; The first communication port and the first communication groove are respectively arranged on two opposite sides of the first liquid baffle plate.

5. The cooling system according to claim 4, characterized in that A second connecting groove penetrating to the second groove body is provided at the bottom of the first groove body, and the second connecting groove connects the water outlet end of the second liquid path and the water inlet end of the third liquid path.

6. The cooling system according to claim 5, characterized in that The second communicating groove is arranged away from the first communicating groove.

7. The cooling system according to claim 3, characterized in that: A first supporting portion is disposed at the bottom of the first tank body, and the first liquid baffle plate is carried on the first supporting portion.

8. The cooling system according to claim 3, characterized in that A recessed portion is provided at the bottom of the second groove body, a second supporting portion is provided at the recessed portion, and the second liquid baffle plate is carried on the second supporting portion.

9. The cooling system according to claim 8, characterized in that A second communication port is formed between one side of the second liquid baffle plate and the side wall of the recessed portion, and the second communication port is connected with the third liquid path and the liquid outlet; And / or, a plate surface of the second liquid baffle plate away from the second supporting portion is flush with the bottom of the second trough body.

10. The cooling system according to any one of claims 1 to 9, characterized in that: The liquid inlet and the liquid outlet are arranged on two opposite sides of the heat dissipation component.

11. The cooling system according to any one of claims 1 to 9, characterized in that: The cooling system also includes a first heating device and a second heating device. The first heating device is arranged above the heat dissipation component and is in thermal contact with the coolant flowing through the first liquid path. The second heating device is arranged below the heat dissipation component and is in thermal contact with the coolant flowing through the third liquid path.

12. The cooling system according to claim 11, characterized in that A first sealing ring is provided between the first heating device and the heat dissipation assembly; And / or, a second sealing ring is provided between the second heating device and the heat dissipation assembly.

13. A motor controller, characterized in that: Comprising a cooling system as claimed in any one of claims 1 to 12.

14. An electric drive system, characterized in that: Comprising a motor controller as claimed in claim 13.

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