Heat dissipation structure of power supply module of electric vehicle

Abstract

The utility model discloses a heat dissipation structure of an electric automobile power supply module, a heat dissipation shell of the structure is arranged on the bottom surface of a heat dissipation bottom plate, a first heat dissipation cavity and a second heat dissipation cavity which are arranged at an interval are respectively arranged on the surface of the heat dissipation bottom plate on one side of the heat dissipation shell, and a cooling liquid flow channel is arranged between the surface of the heat dissipation bottom plate and the periphery of the heat dissipation shell. The cover plate is arranged on the surface of the heat dissipation bottom plate, the two ends of the cooling liquid flow channel communicate with the first heat dissipation cavity and the second heat dissipation cavity correspondingly, and a first cooling liquid inlet and outlet and a second cooling liquid inlet and outlet communicating with the first heat dissipation cavity and the second heat dissipation cavity are formed in the end face, on one side of the heat dissipation shell, of the heat dissipation bottom plate correspondingly. And the flow directions of cooling liquid in the first heat dissipation cavity and the second heat dissipation cavity are opposite. The heat dissipation structure overcomes the defect of water channel cooling of a traditional power module, adopts a composite cooling water channel structure, achieves heat dissipation of a vertically-arranged high-power device and a patch high-power device on a PCBA at the same time, increases the utilization rate of the water channel cooling area, and effectively improves the power performance of the power module of the electric vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a heat dissipation structure of a power module of an electric vehicle. Background Art

[0002] The output power requirements for on-board charging and voltage conversion in existing electric vehicles are gradually increasing, and the heat generated by power devices in power modules has also increased significantly. Most of the existing water channel cooling solutions for power modules are side wall water channels or bottom water channels. Among them, the side wall water channel solution is difficult to dissipate heat for high-power SMD devices on PCBA, and the bottom water channel solution has poor cooling effect for vertically arranged high-power devices such as MOS tubes and low water channel space utilization, which seriously affects the power performance of electric vehicle power modules. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a heat dissipation structure of an electric vehicle power module. The heat dissipation structure overcomes the defects of water channel cooling of traditional power modules, adopts a composite cooling water channel structure, realizes the heat dissipation of high-power devices arranged in a vertical manner and high-power devices on the surface of the PCBA, increases the utilization rate of the water channel cooling area, and effectively improves the power performance of the electric vehicle power module.

[0004] In order to solve the above technical problems, the heat dissipation structure of the electric vehicle power module of the utility model includes a heat dissipation shell, a heat dissipation base plate and a cover plate. The heat dissipation shell is arranged on the bottom surface of the heat dissipation base plate, and the surface of the heat dissipation base plate is respectively provided with a first heat dissipation cavity and a second heat dissipation cavity arranged at intervals on one side of the heat dissipation shell. A coolant flow channel is provided between the surface of the heat dissipation base plate and the periphery of the heat dissipation shell, and the two ends of the coolant flow channel are respectively connected to the first heat dissipation cavity and the second heat dissipation cavity. The cover plate is arranged on the surface of the heat dissipation base plate and seals the first heat dissipation cavity, the second heat dissipation cavity and the coolant flow channel. The end surface of the heat dissipation base plate is respectively provided with a first coolant inlet and a second coolant inlet and a second coolant inlet connecting the first heat dissipation cavity and the second heat dissipation cavity on one side of the heat dissipation shell, and the coolant in the first heat dissipation cavity and the second heat dissipation cavity flow in opposite directions.

[0005] Furthermore, a first partition rib for separating the first heat dissipation cavity from the second heat dissipation cavity is provided between the first heat dissipation cavity and the second heat dissipation cavity.

[0006] Furthermore, a plurality of heat dissipation ribs arranged in parallel and at intervals are respectively provided in the first heat dissipation cavity and the second heat dissipation cavity.

[0007] Furthermore, second partition ribs for guiding the flow of the coolant are respectively provided between the two ends of the coolant flow channel and the first heat dissipation cavity and the second heat dissipation cavity.

[0008] Furthermore, the side wall of the heat dissipation housing is hollow and connected to the coolant flow channel.

[0009] Furthermore, the outer wall of the side surface of the heat dissipation housing forms a first heat dissipation portion, the inner wall forms a second heat dissipation portion, and the bottom surface of the heat dissipation base plate forms a third heat dissipation portion.

[0010] Furthermore, the heat dissipation base plate and the cover plate are fixedly connected by welding, or sealed and fixedly connected by a sealing ring and screws.

[0011] Since the heat dissipation structure of the electric vehicle power module of the utility model adopts the above technical solution, that is, the heat dissipation shell of the structure is arranged on the bottom surface of the heat dissipation base plate, the surface of the heat dissipation base plate is respectively provided with a first heat dissipation cavity and a second heat dissipation cavity arranged at intervals on one side of the heat dissipation shell, a coolant flow channel is provided between the surface of the heat dissipation base plate and the periphery of the heat dissipation shell, a cover plate is arranged on the surface of the heat dissipation base plate and seals the first heat dissipation cavity, the second heat dissipation cavity and the coolant flow channel, the two ends of the coolant flow channel are respectively connected to the first heat dissipation cavity and the second heat dissipation cavity, the end surface of the heat dissipation base plate is respectively provided with a first coolant inlet and a second coolant inlet and a second coolant inlet connecting the first heat dissipation cavity and the second heat dissipation cavity on one side of the heat dissipation shell, and the coolant in the first heat dissipation cavity and the second heat dissipation cavity flow in opposite directions. The heat dissipation structure overcomes the defects of water channel cooling of traditional power module, adopts a composite cooling water channel structure, realizes the heat dissipation of high-power devices arranged in a vertical manner at the same time and the patch high-power devices on the PCBA, increases the utilization rate of the water channel cooling area, and effectively improves the power performance of the electric vehicle power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0013] Figure 1 This is a schematic diagram of the heat dissipation structure of the electric vehicle power module according to Embodiment 1 of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the back side;

[0015] Figure 3 This is a schematic diagram of the hollow side wall of the heat dissipation shell in the heat dissipation structure;

[0016] Figure 4 This is a schematic diagram of the cooling liquid flow direction of the heat dissipation structure embodiment 1;

[0017] Figure 5 This is a schematic diagram of Embodiment 2 of the heat dissipation structure;

[0018] Figure 6 This is a schematic diagram of the cooling liquid flow direction of the heat dissipation structure embodiment 2;

[0019] Figure 7 This is the overall schematic diagram of the heat dissipation structure. DETAILED DESCRIPTION

[0020] Example 1 Figure 1 and Figure 2 As shown, the heat dissipation structure of the electric vehicle power module of the utility model includes a heat dissipation shell 1, a heat dissipation base plate 2 and a cover plate 3, the heat dissipation shell 1 is arranged on the bottom surface of the heat dissipation base plate 2, and the surface of the heat dissipation base plate 2 is respectively provided with a first heat dissipation cavity 21 and a second heat dissipation cavity 22 arranged at intervals on one side of the heat dissipation shell 1, a coolant flow channel 23 is provided between the surface of the heat dissipation base plate 2 and the periphery of the heat dissipation shell 1, and the two ends of the coolant flow channel 23 are respectively connected to the first heat dissipation cavity 21 and the second heat dissipation cavity 22, the cover plate 3 is arranged on the surface of the heat dissipation base plate 2 and seals the first heat dissipation cavity 21, the second heat dissipation cavity 22 and the coolant flow channel 23, and the end surface of the heat dissipation base plate 2 is respectively provided with a first coolant inlet and outlet 24 and a second coolant inlet and outlet 25 connecting the first heat dissipation cavity 21 and the second heat dissipation cavity 22 on one side of the heat dissipation shell 1, and the coolant in the first heat dissipation cavity 21 and the second heat dissipation cavity 22 flow in opposite directions.

[0021] Preferably, a first partition rib 26 for separating the first heat dissipation cavity 21 from the second heat dissipation cavity 22 is provided between the first heat dissipation cavity 21 and the second heat dissipation cavity 22 .

[0022] Preferably, a plurality of heat dissipation ribs 27 arranged in parallel and at intervals are respectively provided in the first heat dissipation cavity 21 and the second heat dissipation cavity 22 .

[0023] Preferably, second partition ribs 28 for guiding the flow of the coolant are respectively provided between the two ends of the coolant flow channel 23 and the first heat dissipation cavity 21 and the second heat dissipation cavity 22 .

[0024] like Figure 3 As shown, preferably, the side wall of the heat dissipation housing 1 is hollow 13 and connected to the coolant flow channel 23. The side wall hollow 13 of the heat dissipation housing and the coolant flow channel 23 form a whole, thereby improving the cooling effect of the heat dissipation housing 1.

[0025] like Figure 2 As shown, preferably, the outer wall of the side of the heat dissipation housing 1 forms a first heat dissipation portion 11, the inner wall forms a second heat dissipation portion 12, and the bottom surface of the heat dissipation base plate 2 forms a third heat dissipation portion 29. The first heat dissipation portion and the second heat dissipation portion are provided with high-power devices such as MOS tubes of the power module, so as to cool the high-power devices such as MOS tubes; the third heat dissipation portion is provided with a PCBA board, so as to cool the high-power SMD devices on the PCBA board.

[0026] Preferably, the heat dissipation base plate 2 and the cover plate 3 are fixedly connected by welding, or sealed and fixedly connected by a sealing ring and screws.

[0027] In Example 1, the first coolant inlet and outlet 24 and the second coolant inlet and outlet 25 can be set as the coolant inlet and outlet respectively as needed, so that the coolant inlet and outlet are interchanged to change the flow direction of the coolant; Figure 4 As shown, if the first coolant inlet and outlet 24 is set as the coolant inlet, the coolant flows through the first heat dissipation cavity 21, the coolant flow channel 23 and the second heat dissipation cavity 22, and then flows out from the second coolant inlet and outlet 25. The coolant effectively cools the heat dissipation housing 1 and the heat dissipation base plate 2, thereby cooling the high-power devices such as MOS tubes arranged on the side wall of the heat dissipation housing or the high-power devices of the surface mount on the heat dissipation base plate, thereby improving the power performance of the high-power devices.

[0028] Embodiment 2, as Figure 5 As shown, on the basis of Example 1, the first coolant inlet and outlet 24 and the second coolant inlet and outlet 25 can be respectively arranged on the end surface of the heat dissipation base plate 2 on the other side of the heat dissipation shell 1 and connected to the coolant flow channel 23. The first coolant inlet and outlet 24 and the second coolant inlet and outlet 25 are separated by a third partition rib 30. The third partition rib 30 also divides the coolant flow channel 23 into two sides. At this time, a notch is provided at the end of the first partition rib 26, so that the first heat dissipation cavity 21 and the second heat dissipation cavity 22 are connected.

[0029] like Figure 6 As shown, in Example 2, if the first coolant inlet and outlet 24 is set as the coolant inlet, the coolant flows through the coolant flow channel 23 on one side, the first heat dissipation cavity 21, the second heat dissipation cavity 22 and the coolant flow channel 23 on the other side, and flows out from the second coolant inlet and outlet 25. Similarly, the heat dissipation housing and the heat dissipation bottom plate are effectively cooled.

[0030] like Figure 3 and Figure 7 As shown, in Example 1 and Example 2, in order to facilitate mechanical processing, the first heat dissipation cavity 21, the second heat dissipation cavity 22 and the coolant flow channel 23 can be processed on the surface of the heat dissipation base plate 2, and the cover plate 3 is used to seal the first heat dissipation cavity 21, the second heat dissipation cavity 22 and the coolant flow channel 23 on the surface of the heat dissipation base plate 2, and the entire heat dissipation structure has only the first coolant inlet and outlet 24 and the second coolant inlet and outlet 25 to the outside.

[0031] The heat dissipation structure of the traditional electric vehicle power module is to dissipate heat by setting water channels on the heat dissipation bottom plate or the side wall of the inner cavity of the heat dissipation shell. In these two heat dissipation methods, the former has a relatively low utilization rate of the water channel space and has poor heat dissipation effect for vertically arranged power devices, while the latter cannot dissipate heat well for high-power SMD devices on PCBA. This heat dissipation structure adopts a composite water channel, that is, a combination of bottom water channels and side wall water channels, which can achieve heat dissipation for both vertically arranged power devices and high-power SMD devices on PCBA, while increasing the utilization rate of the water channel cooling area and effectively improving the power performance of the power module.

Claims

1. A heat dissipation structure of an electric vehicle power module, comprising a heat dissipation shell, a heat dissipation bottom plate and a cover plate, wherein the heat dissipation shell is arranged on the bottom surface of the heat dissipation bottom plate, and is characterized in that: The surface of the heat dissipation base plate is respectively provided with a first heat dissipation cavity and a second heat dissipation cavity arranged at intervals on one side of the heat dissipation shell, a coolant flow channel is provided between the surface of the heat dissipation base plate and the periphery of the heat dissipation shell, and the two ends of the coolant flow channel are respectively connected to the first heat dissipation cavity and the second heat dissipation cavity, the cover plate is provided on the surface of the heat dissipation base plate and seals the first heat dissipation cavity, the second heat dissipation cavity and the coolant flow channel, and the end surface of the heat dissipation base plate is respectively provided with a first coolant inlet and a second coolant inlet and a second coolant inlet connecting the first heat dissipation cavity and the second heat dissipation cavity on one side of the heat dissipation shell, and the coolant in the first heat dissipation cavity flows in the opposite direction to the second heat dissipation cavity.

2. The heat dissipation structure of the electric vehicle power module according to claim 1, characterized in that: A first partition rib is provided between the first heat dissipation cavity and the second heat dissipation cavity to separate the first heat dissipation cavity and the second heat dissipation cavity.

3. The heat dissipation structure of the electric vehicle power module according to claim 1 or 2, characterized in that: A plurality of heat dissipation ribs arranged in parallel and at intervals are respectively provided in the first heat dissipation cavity and the second heat dissipation cavity.

4. The heat dissipation structure of the electric vehicle power module according to claim 3 is characterized in that: Second partition ribs for guiding the flow of the coolant are respectively arranged between the two ends of the coolant flow channel and the first heat dissipation cavity and the second heat dissipation cavity.

5. The heat dissipation structure of the electric vehicle power module according to claim 1, characterized in that: The side wall of the heat dissipation housing is hollow and connected to the coolant flow channel.

6. The heat dissipation structure of the electric vehicle power module according to claim 5, characterized in that: The outer wall of the side surface of the heat dissipation housing forms a first heat dissipation portion, the inner wall forms a second heat dissipation portion, and the bottom surface of the heat dissipation bottom plate forms a third heat dissipation portion.

7. The heat dissipation structure of the electric vehicle power module according to claim 5 or 6, characterized in that: The heat dissipation bottom plate and the cover plate are fixedly connected by welding, or sealed and fixedly connected by a sealing ring and screws.

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