A heat dissipation device, motor controller and automobile

Abstract

The application relates to the technical field of heat dissipation, and provides a heat dissipation device, a motor controller and an automobile. The heat dissipation device comprises a bottom plate, a heat dissipation plate and a heat dissipation piece. The bottom plate is formed with a refrigerant flow channel, an inlet, an outlet and a mounting hole, and the inlet, the mounting hole and the outlet are communicated with the refrigerant flow channel; the heat dissipation plate seals the mounting hole, the heat dissipation plate is formed with a heat dissipation area and a vacant area, the heat dissipation area comprises an expansion sub-area and a connecting sub-area, the expansion sub-area and the connecting sub-area are arranged along a liquid flow direction, and at least one of the expansion sub-area and the connecting sub-area is used for arranging a heat source; the expansion sub-area protrudes the connecting sub-area along at least one side in the transverse direction, and the vacant area is located on the side of the expansion sub-area protruding the connecting sub-area in the transverse direction; the heat dissipation piece is connected with the inner surface of the heat dissipation area, and at least part of the heat dissipation piece extends into the refrigerant flow channel through the mounting hole. The heat dissipation device, the motor controller and the automobile provided by the application can reduce the number of invalid heat dissipation pieces.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat dissipation technology, in particular to a heat dissipation device, a motor controller and a vehicle. BACKGROUND

[0002] In order to improve the heat dissipation effect, the motor controller of the vehicle sets multiple heat dissipation pieces in the heat dissipation device, and the heat dissipation pieces are used for heat exchange with refrigerant to achieve heat dissipation. In the related art, the number of heat dissipation devices is large, the volume is large, and the cost is high. SUMMARY

[0003] Therefore, the embodiments of the present application provide a heat dissipation device, a motor controller and a vehicle, which can reduce the number of invalid heat dissipation pieces.

[0004] In order to achieve the above purpose, the technical scheme of the embodiments of the present application is as follows:

[0005] The embodiments of the present application disclose a heat dissipation device, comprising:

[0006] A bottom plate is formed with a refrigerant flow channel, an inlet, an outlet and a mounting hole, and the inlet, the mounting hole and the outlet are in communication with the refrigerant flow channel;

[0007] A heat dissipation plate is provided to close the mounting hole, and the heat dissipation plate is formed with a heat dissipation area and a vacant area, the heat dissipation area includes an enlarged sub-area and a connecting sub-area, the enlarged sub-area and the connecting sub-area are arranged along the liquid flow direction, and at least one of the enlarged sub-area and the connecting sub-area is used to set a heat source; the enlarged sub-area protrudes the connecting sub-area along at least one side in the transverse direction, and the vacant area is located on the side of the connecting sub-area protruding the enlarged sub-area in the transverse direction;

[0008] A heat dissipation piece is connected with the inner surface of the heat dissipation area, and at least part of the heat dissipation piece extends into the refrigerant flow channel through the mounting hole.

[0009] In an embodiment, the number of the enlarged sub-areas and the connecting sub-areas is multiple, the multiple enlarged sub-areas are arranged at intervals along the liquid flow direction, and the connecting sub-area connects two adjacent enlarged sub-areas.

[0010] In an embodiment, multiple heat dissipation pieces are arranged at intervals in the transverse direction to form a heat dissipation group, and multiple heat dissipation groups are arranged at intervals along the liquid flow direction to form a heat dissipation part.

[0011] In an embodiment, multiple heat dissipation parts are arranged at intervals along the liquid flow direction.

[0012] In an embodiment, in each heat dissipation part, the number of heat dissipation pieces of each heat dissipation group increases first and then decreases along the liquid flow direction.

[0013] In an embodiment, in each of the heat dissipation parts, the heat dissipation pieces of two adjacent heat dissipation groups are arranged in a staggered manner in the transverse direction.

[0014] In an embodiment, the heat dissipation piece has a flow-approaching surface and a flow-receding surface formed in the flow direction, the flow-receding surface is a flat surface, and the flow-approaching surface is a convex arc surface protruding away from the flow-receding surface.

[0015] In an embodiment, in a projection in the thickness direction of the heat dissipation plate, the flow-receding surface and the flow-approaching surface form a semicircular shape, and the flow direction is perpendicular to the thickness direction of the heat dissipation plate.

[0016] In an embodiment, the refrigerant flow channel includes an expansion section and a contraction section, a transverse dimension of the expansion section is greater than a transverse dimension of the contraction section, a projection plane perpendicular to the thickness direction of the heat dissipation plate is used as a projection plane, a projection of the expansion section is located within a projection of the expansion sub-region, and a projection of the contraction section is located within a projection of the connection sub-region.

[0017] In an embodiment, the number of the expansion sections is multiple, the multiple expansion sections are arranged at intervals in the flow direction, one contraction section is arranged between two adjacent expansion sections, the refrigerant flow channel includes multiple transition sections, the transition sections are arranged on both sides of the contraction section in the flow direction, the transition sections connect the adjacent expansion section and the contraction section, and a transverse dimension of the transition section gradually increases or decreases in the flow direction.

[0018] In an embodiment, a projection plane perpendicular to the thickness direction of the heat dissipation plate is used as a projection plane, a connection between the transition section and the expansion section is in an arc shape, and a connection between the transition section and the contraction section is in an arc shape.

[0019] Another aspect of the embodiments of the present application discloses a motor controller including the heat dissipation device in any one of the above embodiments.

[0020] Another aspect of the embodiments of the present application discloses an automobile including the motor controller in the above embodiments.

[0021] This application discloses a heat dissipation device, a motor controller, and an automobile. By forming a cold flow channel on the base plate, one end of a heat sink is connected to the inner surface of the heat dissipation area, and the other end of the heat sink is at least partially disposed within the refrigerant flow channel. This allows the heat source located in the heat dissipation area to exchange heat with the refrigerant in the refrigerant flow channel through the heat sink, thereby removing heat from the heat source and preventing overheating and burnout, thus extending the lifespan of the heat source. By providing an outlet and an inlet on the base plate, the refrigerant can enter the refrigerant flow channel through the inlet to exchange heat with the heat sink and then flow out from the outlet. This allows for real-time replacement of the refrigerant in the refrigerant flow channel, improving heat dissipation efficiency. By placing heat sinks in the heat dissipation area and omitting them in unused areas, the number of ineffective heat sinks can be reduced, lowering costs. By extending the connecting sub-region beyond the lateral side of the enlarged sub-region, the heat dissipation area can be increased, thus enhancing the heat dissipation effect. Furthermore, by placing the vacant area on the side of the enlarged sub-region that protrudes beyond the lateral side of the connecting sub-region, the area of ​​the vacant area can be increased, further reducing the number of heat dissipation components and lowering costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a heat dissipation device provided in an embodiment of this application, wherein the heat dissipation plate closes the mounting opening, and at least a portion of the heat dissipation component is located within the refrigerant flow channel;

[0023] Figure 2 for Figure 1 Schematic diagram of the midsole plate;

[0024] Figure 3 This is a schematic diagram of the structure of a heat sink and a heat sink plate provided in another embodiment of this application;

[0025] Figure 4 for Figure 2 Schematic diagram of the cross-section at the flared end;

[0026] Figure 5 for Figure 2 A schematic diagram of the cross-section at the narrowed end.

[0027] Explanation of reference numerals in the attached figures

[0028] Heat dissipation device 100; base plate 1; refrigerant flow channel 1a; flared end 1a1; narrow end 1a2; transition section 1a3; guide channel 1a4; liquid inlet 1b; liquid outlet 1c; mounting port 1d; heat dissipation plate 2; heat dissipation area 2a; enlarged sub-area 2a1; connecting sub-area 2a2; empty area 2b; heat dissipation component 3; front flow surface 3a; back flow surface 3b; heat dissipation group A; heat dissipation part B; heat source C. Detailed Implementation

[0029] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present application, and should not be regarded as an improper limitation on the present application.

[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The "first", "second" and the like in the embodiments of the present application are only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0031] The present application provides a heat dissipation device in one aspect, please refer to Figures 1 to 5 The heat dissipation device 100 includes a bottom plate 1, a heat dissipation plate 2 and a heat dissipation piece 3. The bottom plate 1 is formed with a refrigerant flow channel 1a, an inlet 1b, an outlet 1c and a mounting port 1d, and the inlet 1b, the mounting port 1d and the outlet 1c are all in communication with the refrigerant flow channel 1a.

[0032] The heat dissipation plate 2 seals the mounting port 1d, and the heat dissipation plate 2 is formed with a heat dissipation area 2a and a vacant area 2b. The heat dissipation area 2a includes an enlarged sub-area 2a1 and a connecting sub-area 2a2, and the enlarged sub-area 2a1 and the connecting sub-area 2a2 are arranged along the liquid flow direction. At least one of the enlarged sub-area 2a1 and the connecting sub-area 2a2 is used to set a heat source C; the enlarged sub-area 2a1 protrudes the connecting sub-area 2a2 along at least one side of the transverse direction, and the vacant area 2b is located on the side of the connecting sub-area 2a2 protruding the enlarged sub-area 2a1 along the transverse direction.

[0033] The heat dissipation piece 3 is connected with the inner surface of the heat dissipation area 2a, and at least part of the heat dissipation piece 3 extends into the refrigerant flow channel 1a through the mounting port 1d.

[0034] The heat dissipation device 100 provided by the embodiment of the present application is characterized in that: a cold flow channel is formed on the bottom plate 1, one end of the heat dissipation piece 3 is connected with the inner surface of the heat dissipation area 2a, and the other end of the heat dissipation piece 3 is at least partially arranged in the refrigerant flow channel 1a. In this way, the heat source C arranged in the heat dissipation area 2a can exchange heat with the refrigerant in the refrigerant flow channel 1a through the heat dissipation piece 3, so as to take away the heat of the heat source C, thereby avoiding the situation that the heat source C is overheated and burned out, and improving the service life of the heat source C. The liquid outlet 1c and the liquid inlet 1b are arranged on the bottom plate 1. In this way, the refrigerant can enter the refrigerant flow channel 1a through the liquid inlet 1b to exchange heat with the heat dissipation piece 3, and then flow out from the liquid outlet 1c. In this way, the refrigerant in the refrigerant flow channel 1a can be replaced in real time, and the heat dissipation effect is improved. The heat dissipation piece 3 is arranged in the heat dissipation area 2a, and the heat dissipation piece 3 is not arranged in the idle area 2b. In this way, the number of the heat dissipation pieces 3 arranged for invalid heat dissipation can be reduced, and the cost is reduced. The enlarged sub-area 2a1 is protruded along at least one side of the transverse direction to connect the sub-area 2a2. In this way, the heat dissipation area 2a can be enlarged, and the heat dissipation effect is enhanced. Then, the idle area 2b is located on the side of the sub-area 2a2 protruding from the enlarged sub-area 2a1 along the transverse direction. In this way, the area of the idle area 2b can be enlarged, and the number of the heat dissipation pieces 3 arranged is further reduced, and the cost is reduced.

[0035] For example, in an embodiment, as shown in Figures 1 to 3 The shape of the bottom plate 1 is not limited, for example, the bottom plate 1 can be a box-shaped cuboid. The shape of the heat dissipation plate 2 is not limited, for example, the heat dissipation plate 2 can be a plate-shaped rectangle.

[0036] For example, in an embodiment, the heat dissipation piece 3 and the bottom plate 1 can be connected in a detachable manner, for example, clamping and screwing and the like.

[0037] For example, in an embodiment, as shown in Figure 2 The liquid inlet 1b and the liquid outlet 1c are arranged on both sides of the bottom plate 1 along the liquid flow direction. In this way, the convection effect of the refrigerant can be increased, and the flow resistance of the refrigerant can be reduced, and the flow of the refrigerant can be more stable.

[0038] In another aspect, the embodiment of the present application provides a motor controller, which comprises the heat dissipation device 100 in any one of the above-mentioned embodiments.

[0039] Exemplarily, in an embodiment, the heat source C can be an IGBT module. Since the IGBT module is a core component of the motor controller, the cost accounts for about 35% of the motor controller, and is the most valuable component in the motor controller. By arranging the heat dissipation device 100 and arranging the IGBT module on the heat dissipation device 100, on one hand, the IGBT module can be effectively cooled, and the situation of overheating and burning out can be avoided, and the service life of the IGBT module is improved. On the other hand, the number of invalid heat dissipation heat dissipation pieces 3 can be reduced, and the manufacturing cost of the motor controller is reduced.

[0040] In another aspect, the embodiment of the application provides an automobile comprising the motor controller in the above embodiment.

[0041] Exemplarily, in an embodiment, the automobile can be a new energy automobile, and the automobile comprises a motor connected with the motor controller. Since the new energy automobile needs to convert the direct current output by the battery pack into alternating current required by the motor, and in the running process of the motor, the frequency of the alternating current input into the motor often needs to be adjusted to change the rotating speed of the motor. This function is mainly realized by the IGBT module in the motor controller through the control signal to quickly turn on and turn off to convert the direct current into alternating current, or to change the input current into alternating current of the required frequency. In the process of quickly turning on and turning off the IGBT module, turn-on loss and turn-off loss are generated, which will cause the IGBT module to heat up. Once the IGBT module heats up and the temperature exceeds the range that the IGBT module can withstand, the IGBT module will be damaged. In the automobile provided in the embodiment of the application, on one hand, the IGBT module of the motor controller is effectively cooled by the heat dissipation device 100, so that the direct current output by the battery pack can be stably converted into alternating current required by the motor and the rotating speed of the motor can be changed, and the working stability is good. On the other hand, while meeting the effective cooling, the number of heat dissipation pieces 3 can be reduced, and the manufacturing cost of the whole vehicle is reduced.

[0042] In an embodiment, please refer to Figure 3, the number of the plurality of enlarged sub-zones 2a1 and the plurality of connecting sub-zones 2a2 is multiple, the plurality of enlarged sub-zones 2a1 are arranged along the liquid flow direction, and the connecting sub-zones 2a2 connect two adjacent enlarged sub-zones 2a1. For example, the number of the plurality of enlarged sub-zones 2a1 and the plurality of connecting sub-zones 2a2 is not limited, for example, the number of the plurality of enlarged sub-zones 2a1 can be 3, the number of the plurality of connecting sub-zones 2a2 can be 2, and the 3 enlarged sub-zones 2a1 are connected by the 2 connecting sub-zones 2a2. In this way, on the one hand, by arranging the plurality of enlarged sub-zones 2a1 and the plurality of connecting sub-zones 2a2, the heat dissipation area 2a can be increased and the heat dissipation effect can be improved; on the other hand, the plurality of heat sources C can be cooled, the space can be saved, and the heat dissipation cost can be reduced; and on the other hand, by arranging the plurality of heat sources C on the heat dissipation plate 2 for cooling, the cooling of the plurality of heat sources C can be more uniform, thereby improving the overall stability of the motor controller.

[0043] In an embodiment, referring to Figure 3 , the plurality of heat dissipation members 3 are arranged along the transverse direction to form a heat dissipation group A, and the plurality of heat dissipation groups A are arranged along the liquid flow direction to form a heat dissipation part B. In this way, the heat source C can be cooled in the transverse direction and the liquid flow direction to improve the uniformity of heat dissipation and avoid local overheating of the heat source C.

[0044] In an embodiment, referring to Figure 3 , the plurality of heat dissipation parts B are arranged along the liquid flow direction. For example, the number of the plurality of heat dissipation parts B is not limited, for example, the number of the plurality of heat dissipation parts B can be 3, and the 3 heat dissipation parts B are arranged along the liquid flow direction, and each heat dissipation part B corresponds to one heat source C. In this way, each heat source C can be cooled in the transverse direction and the liquid flow direction, thereby improving the uniformity of cooling of the 3 heat sources C.

[0045] In an embodiment, referring to Figure 3 , in each heat dissipation part B, the number of the heat dissipation members 3 of each heat dissipation group A increases first and then decreases along the liquid flow direction. For example, the number of the heat dissipation members 3 of each heat dissipation group A can increase and decrease progressively, for example, taking the heat dissipation group A closest to the liquid inlet 1b as an example, the heat dissipation part B has 8 heat dissipation groups A, along the liquid flow direction, the first heat dissipation group A has 6 heat dissipation members 3, the second heat dissipation group A has 7 heat dissipation members 3, the third heat dissipation group A has 8 heat dissipation members 3, the fourth heat dissipation group A has 9 heat dissipation members 3, the fifth heat dissipation group A has 10 heat dissipation members 3, the sixth heat dissipation group A has 9 heat dissipation members 3, the seventh heat dissipation group A has 8 heat dissipation members 3, and the eighth heat dissipation group A has 7 heat dissipation members 3. That is to say, the number of heat dissipation members 3 in each heat dissipation group A increases by 1 from the first heat dissipation group A to the fifth heat dissipation group A, and decreases by 1 from the fifth heat dissipation group A to the eighth heat dissipation group A. In this way, the number of invalid heat dissipation members 3 can be reduced, and the manufacturing cost of the heat dissipation device 100 can be reduced.

[0046] In some embodiments, the number of heat dissipation pieces 3 in each heat dissipation group A can be increased in disorder, for example, the number of heat dissipation pieces 3 in the first heat dissipation group A is 2 more than that in the second heat dissipation group A, and the number of heat dissipation pieces 3 in the third heat dissipation group A is 1 more than that in the second heat dissipation group A.

[0047] In an embodiment, in each heat dissipation part B, the heat dissipation group A with the largest number of heat dissipation pieces 3 is located in the enlarged sub-area 2a1. In this way, on the one hand, the heat dissipation capacity of the enlarged sub-area 2a1 can be enhanced, and the heat of the heat source C located in the enlarged sub-area 2a1 can be quickly taken away, thereby improving the heat dissipation efficiency. On the other hand, by arranging multiple heat dissipation pieces 3 in the enlarged sub-area 2a1, the load of each heat dissipation piece 3 can be reduced, thereby prolonging the service life of the heat dissipation piece 3.

[0048] In an embodiment, referring to Figure 3 In each heat dissipation part B, the heat dissipation pieces 3 of the adjacent two heat dissipation groups A are arranged in a staggered manner in the transverse direction. For example, taking the heat dissipation part B closest to the liquid inlet 1b as an example, the number of heat dissipation pieces 3 of the first heat dissipation group A and the second heat dissipation group A in the heat dissipation part B is 6 and 7 respectively, the first heat dissipation piece 3 in the first heat dissipation group A is located between the first heat dissipation piece 3 and the second heat dissipation piece 3 in the second heat dissipation group A, the second heat dissipation piece 3 in the first heat dissipation group A is located between the second heat dissipation piece 3 and the third heat dissipation piece 3 in the second heat dissipation group A, and the subsequent is similar. After the fifth heat dissipation group A, the heat dissipation pieces 3 are arranged in the opposite way, for example, the first heat dissipation piece 3 in the sixth heat dissipation group A is located between the first heat dissipation piece 3 and the second heat dissipation piece 3 in the fifth heat dissipation group A, and the second heat dissipation piece 3 in the sixth heat dissipation group A is located between the second heat dissipation piece 3 and the third heat dissipation piece 3 in the fifth heat dissipation group A. In this way, on the one hand, by arranging the heat dissipation pieces 3 in a staggered manner in the transverse direction, more heat dissipation pieces 3 can be arranged in the same space, the heat exchange area is increased, and the heat exchange efficiency is improved. On the other hand, the staggered arrangement of the heat dissipation pieces 3 can increase the disturbance to the refrigerant, so that the refrigerant forms a vortex and a turbulent flow. In this way, the heat exchange time of the refrigerant and the heat dissipation pieces 3 can be prolonged, and the heat exchange effect can be improved.

[0049] For example, in an embodiment, the material of the heat dissipation piece 3 can be copper. On the one hand, the thermal conductivity is good, so that the heat of the heat source C can be quickly conducted to improve the heat exchange efficiency. On the other hand, it has strong corrosion resistance to reduce the corrosion of the refrigerant and improve the working stability. On the other hand, it is easy to be made into different shapes, which is convenient for processing.

[0050] In an embodiment, referring to Figure 3The heat dissipation piece 3 is provided with an incident flow surface 3a and a backflow surface 3b along the liquid flow direction. The backflow surface 3b is a plane, and the incident flow surface 3a is a convex arc surface protruding away from the backflow surface 3b. In this way, on the one hand, by setting the incident flow surface 3a as a convex arc, the heat exchange area with the refrigerant can be increased, and the flow resistance to the refrigerant can be reduced, and the heat dissipation effect is enhanced. On the other hand, by setting the backflow surface 3b as a plane, the occupied area of the heat dissipation piece 3 can be reduced, so that more heat dissipation pieces 3 can be arranged along the liquid flow direction, so as to further increase the heat exchange area and enhance the heat dissipation effect.

[0051] It should be noted that the incident flow surface 3a refers to the side of the heat dissipation piece 3 facing the liquid flow direction, and the liquid flow will form a pressure on the incident flow surface 3a. The backflow surface 3b is the side of the heat dissipation piece 3 facing away from the liquid flow direction, and the backflow surface 3b will not be affected by the liquid flow.

[0052] In an embodiment, referring to Figure 3 , along the projection in the thickness direction of the heat dissipation plate 2, the backflow surface 3b and the incident flow surface 3a form a semicircle. The liquid flow direction is perpendicular to the thickness direction of the heat dissipation plate 2. That is, along the projection in the thickness direction of the heat dissipation plate 2, the cross-sectional shape of the heat dissipation piece 3 is semicircular. By setting the cross-sectional shape of the heat dissipation piece 3 as a semicircle, compared with the heat dissipation piece 3 in the related art which is set as a circle or an ellipse, the heat dissipation piece 3 provided in the embodiment not only can reduce the flow resistance to the refrigerant, but also can increase the number of arranged heat dissipation pieces 3, so that the heat dissipation pieces 3 are arranged as a whole in a “fish scale shape” on the heat dissipation plate 2, which can double the heat exchange area in a certain space and quickly reduce the temperature of the heat source C.

[0053] It can be understood that the heat dissipation piece 3 has good heat exchange effect on the incident flow surface 3a and poor heat exchange effect on the backflow surface 3b. If the backflow surface 3b is also set as a convex arc, that is, the heat dissipation piece 3 in the prior art is circular or elliptical along the projection in the thickness direction of the heat dissipation plate 2. Such a setting not only does not enhance the heat exchange effect, but also occupies the arrangement space along the liquid flow direction, so that the number of arranged heat dissipation pieces 3 is reduced.

[0054] For example, in an embodiment, referring to Figure 2, the refrigerant flow channel 1a is formed with a guide groove 1a4 extending away from the mounting opening 1d near the liquid outlet 1c, the groove opening of the guide groove 1a4 is communicated with the refrigerant flow channel 1a, and the two side walls of the guide groove 1a4 are inclined, that is, the groove opening face gradually decreases to the groove bottom face, so that the refrigerant in the refrigerant flow channel 1a can be guided into the guide groove from the two side walls of the guide groove 1a4. The side wall of the guide groove 1a4 away from the liquid inlet 1b is communicated with the liquid outlet 1c along the liquid flow direction, that is, part of the liquid outlet 1c is lower than the bottom wall of the refrigerant flow channel 1a, so that the refrigerant entering the refrigerant flow channel 1a from the liquid inlet 1b exchanges heat with the heat dissipation member 3 and then flows downward into the guide groove 1a4, forming a liquid level difference, which not only prevents the refrigerant from flowing back, but also promotes the flow of the refrigerant, realizes the effect of guiding the flow, and speeds up the heat exchange with the heat dissipation member 3.

[0055] In an embodiment, please refer to Figure 2 , Figure 4 and Figure 5 , the refrigerant flow channel 1a includes an expanded portion 1a1 and a narrowed portion 1a2, the expanded portion 1a1 has a larger transverse dimension than the narrowed portion 1a2, and the projection of the expanded portion 1a1 is located within the projection of the enlarged sub-area 2a1, and the projection of the narrowed portion 1a2 is located within the projection of the connecting sub-area 2a2. In this way, on the one hand, by forming the expanded portion 1a1 and the narrowed portion 1a2, the flow speed of the refrigerant changes at the expanded portion 1a1 and the narrowed portion 1a2, forming flow eddies, which can not only strengthen the heat dissipation effect, but also accelerate the flow speed of the refrigerant when the refrigerant flows from the expanded portion 1a1 into the narrowed portion 1a2, so as to quickly take away the heat of the heat dissipation member 3; on the other hand, by matching the expanded portion 1a1 with the enlarged sub-area 2a1 and matching the narrowed portion 1a2 with the connecting sub-area 2a2, the number of heat dissipation members 3 with no effective heat dissipation can be reduced, and the manufacturing cost of the heat dissipation device 100 can be reduced.

[0056] In an embodiment, please refer to Figure 2 , the number of expanded portions 1a1 is multiple, the multiple expanded portions 1a1 are arranged at intervals along the liquid flow direction, and one narrowed portion 1a2 is arranged between adjacent two expanded portions 1a1. For example, the number of expanded portions 1a1 can be 3, and the number of narrowed portions 1a2 can be 4, 3 expanded portions 1a1 are arranged at intervals along the liquid flow direction, 2 of the 4 narrowed portions 1a2 are arranged between adjacent 2 of the 3 expanded portions 1a1, and the remaining 2 of the 4 narrowed portions 1a2 are communicated with the liquid outlet 1c and the liquid inlet 1b respectively. In this way, by arranging multiple expanded portions 1a1 and narrowed portions 1a2, the disturbance to the refrigerant can be further enhanced, the heat exchange time with the heat dissipation member 3 can be prolonged, and the heat dissipation effect can be improved.

[0057] Please refer to Figure 2The refrigerant flow channel 1a includes a plurality of transition sections 1a3. The two sides of the necked section 1a2 along the liquid flow direction are respectively provided with a transition section 1a3. The transition section 1a3 connects the adjacent flared section 1a1 and the necked section 1a2. For example, the number of the transition sections 1a3 is not limited. For example, the number of the transition sections 1a3 can be six. Each transition section 1a3 connects one flared section 1a1 and one necked section 1a2. The lateral dimension of the transition section 1a3 gradually increases or decreases along the liquid flow direction. For example, the lateral dimension of the first transition section 1a3 gradually increases along the liquid flow direction. The lateral dimension of the second transition section 1a3 gradually decreases along the liquid flow direction. Here, by providing a plurality of transition sections 1a3, the refrigerant can flow to the flared section 1a1 or the necked section 1a2 under the guidance of the transition section 1a3. Thus, the flow direction of the refrigerant can be changed multiple times, so that the refrigerant is more likely to form a flow vortex in the refrigerant flow channel 1a, further strengthening the heat exchange effect.

[0058] In an embodiment, referring to FIG. 2, Figure 2 In an embodiment, referring to FIG. 2, In an embodiment, referring to FIG. 2, The connection between the transition section 1a3 and the flared section 1a1 is in an arc shape. The connection between the transition section 1a3 and the necked section 1a2 is in an arc shape. Thus, the entire refrigerant flow channel 1a is generally in a “wavy shape”. The refrigerant can flow along the wavy shape. On the one hand, the flow speed of the refrigerant can be accelerated, which is beneficial to carrying away the heat of the heat dissipation member 3. On the other hand, when the refrigerant flows through the flared section 1a1 and the necked section 1a2, the flow resistance can be reduced to some extent due to the arc-shaped transition, so that the refrigerant flows more smoothly.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A heat dissipating device, characterized by, The application relates to a heat dissipation device. The heat dissipation device comprises a bottom plate, a heat dissipation plate, and a heat dissipation element. The bottom plate is formed with a refrigerant flow channel, an inlet, an outlet, and a mounting hole, wherein the inlet, the mounting hole, and the outlet are communicated with the refrigerant flow channel. The heat dissipation plate is closed to the mounting hole and is formed with a heat dissipation area and a vacant area.

2. The heat dissipating device according to claim 1, wherein The heat dissipation area comprises an enlarged sub-area and a connecting sub-area, and at least one of the two sub-areas is used for arranging a heat source.

3. The heat dissipating device of claim 1, wherein The enlarged sub-area protrudes the connecting sub-area along at least one side in the transverse direction.

4. The heat dissipating device according to claim 3, wherein The vacant area is located on the side of the connecting sub-area protruding the enlarged sub-area in the transverse direction.

5. The heat dissipating device of claim 3, wherein The heat dissipation element is connected to the inner surface of the heat dissipation area and at least part of the heat dissipation element extends into the refrigerant flow channel through the mounting hole.

6. The heat dissipating device of claim 3, wherein The heat dissipation element is formed with an upstream face and a downstream face along the liquid flow direction.

7. The heat dissipating device of claim 1, wherein The downstream face is a plane, and the upstream face is a convex arc face protruding away from the downstream face.

8. The heat dissipating device according to claim 7, wherein The cross-sectional shape of the heat dissipation element along the thickness direction of the heat dissipation plate is semicircular.

9. The heat dissipation device according to claim 8, characterized in that, The liquid flow direction is perpendicular to the thickness direction of the heat dissipation plate.

10. An electric machine controller characterized by The number of the enlarged sub-areas and the connecting sub-areas is multiple.

11. An automobile characterized by comprising: The multiple enlarged sub-areas are arranged at intervals along the liquid flow direction. The connecting sub-area connects two adjacent enlarged sub-areas. The multiple heat dissipation elements are arranged at intervals in the transverse direction to form a heat dissipation group. The multiple heat dissipation groups are arranged at intervals along the liquid flow direction to form a heat dissipation part. The multiple heat dissipation parts are arranged at intervals along the liquid flow direction. In each heat dissipation part, the number of heat dissipation elements of each heat dissipation group increases first and then decreases along the liquid flow direction. In each heat dissipation part, the heat dissipation elements of two adjacent heat dissipation groups are arranged in a staggered manner in the transverse direction. The refrigerant flow channel comprises an expanding part and a contracting part. The size of the expanding part in the transverse direction is larger than that of the contracting part in the transverse direction. The projection of the expanding part is located in the projection of the enlarged sub-area. The projection of the contracting part is located in the projection of the connecting sub-area. The number of the expanding parts is multiple. The multiple expanding parts are arranged at intervals along the liquid flow direction. One contracting part is arranged between two adjacent expanding parts. The refrigerant flow channel comprises multiple transition sections. The transition sections are arranged on both sides of the contracting part along the liquid flow direction. The transition sections connect the adjacent expanding part and the contracting part. The transverse size of the transition section gradually expands or shrinks along the liquid flow direction. The connection between the transition section and the expanding part is an arc line. The connection between the transition section and the contracting part is an arc line. The heat dissipation device comprises any one of claims 1-9. The motor controller comprises claim 10.

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