Cooling device for driving motor controller of new energy automobile

Abstract

The utility model discloses a new energy automobile drive motor controller cooling device which comprises a shell, a sealing cover connected with the shell, a power device and a cooling plate connected with the power device, and a first cavity for containing a first cooling medium and the power device is formed between the sealing cover and the cooling plate. And a second cavity for accommodating a second cooling medium is formed between the shell and the cooling plate. The cooling device for the new energy automobile driving motor controller can realize mixed cooling of the controller, improve the heat dissipation effect, and further improve the performance of the controller or reduce the cost of a power device.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooling devices. Specifically, the utility model relates to a cooling device for a driving motor controller of a new energy vehicle. Background Art

[0002] The cooling of a driving motor controller of a new energy vehicle (hereinafter referred to as the controller) has an important impact on the controller, which is mainly reflected in the following aspects:

[0003] 1. Affect the controller function. The controller has clear requirements for cooling and heat dissipation. On the one hand, it needs to meet the performance requirements. On the other hand, there are certain requirements for the thermal safety of the controller system. Generally, the functional safety requirement reaches ASIL B to avoid derating, failure or damage of the controller due to overheating.

[0004] 2. Affect the service life of the controller. Good temperature control enables the controller to always work in a suitable working temperature range, which can significantly improve the service life of the controller.

[0005] 3. Have a greater impact on the cost. The main heat loss components of the controller are the power module, DC bus capacitor, and copper bar in sequence. Taking the power module as an example, good heat dissipation can improve the current-carrying capacity per unit area of the chips inside the power module, thereby reducing the use of chips and significantly reducing the cost of the controller.

[0006] In order to ensure thermal safety, performance, service life, and cost, etc., the cooling and heat dissipation design of the controller needs to be considered emphatically.

[0007] At present, the cooling solutions for the controller mainly include air cooling and water cooling. Air cooling is mainly for low-power applications, and water cooling is mostly applied to high-power controllers (about 45 kW and above).

[0008] In the water cooling solution, the heat dissipation path of the chip is chip → soldering layer → copper-clad layer → ceramic plate → copper-clad layer → heat dissipation plate (for flat heat dissipation, it also needs → heat dissipation silicone grease → heat dissipation plate). The heat dissipation path is long, the thermal resistance is large, and the heat dissipation effect is limited.

[0009] A Chinese patent with the application number 202120377779.4 discloses a heat dissipation device for a new energy electric vehicle motor controller, which includes a box body, a first through hole, a second through hole, a bottom plate, a third through hole, a partition board, a partition net, a fan, a fan cover, and mounting holes. The bottom of the box body is open, and the box body also includes an upper panel, a left panel, a right panel, a front panel, and a rear panel. The box body is fixed on the bottom plate. The upper panel is provided with a number of first ventilation holes. The front panel and the rear panel are both provided with a number of second through holes. The left panel and the right panel are both provided with fan covers. A fan is arranged inside the fan cover. The partition board is arranged directly below the first through hole. The two ends of the partition board are respectively connected to the front panel and the rear panel. The upper and lower ends of the partition net are respectively connected to the side walls of the first through hole and the partition board. The bottom plate is provided with a number of parallel third through holes. Four mounting holes are respectively arranged at the four corners of the bottom plate.

[0010] It is desired to provide an improved cooling device for a driving motor controller of a new energy vehicle, particularly regarding improving the heat dissipation effect of the driving motor controller of a new energy vehicle. Utility Model Content

[0011] The present utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the present utility model provides a cooling device for a driving motor controller of a new energy vehicle, with the aim of improving the heat dissipation effect of the driving motor controller of a new energy vehicle.

[0012] To achieve the above object, the technical solution adopted by the present utility model is: a cooling device for a driving motor controller of a new energy vehicle, which includes a housing, a sealing cover connected to the housing, a power device, and a cooling plate connected to the power device. A first cavity for accommodating a first cooling medium and the power device is formed between the sealing cover and the cooling plate, and a second cavity for accommodating a second cooling medium is formed between the housing and the cooling plate.

[0013] A first sealing ring is arranged between the sealing cover and the housing.

[0014] The sealing cover is fixedly connected to the housing by screws.

[0015] A second sealing ring is arranged between the cooling plate and the housing.

[0016] The first cooling medium and the second cooling medium are two different cooling media.

[0017] The first cooling medium is cooling oil, and the second cooling medium is cooling water.

[0018] The cooling device for a driving motor controller of a new energy vehicle of the present utility model can achieve the hybrid cooling of the controller, improve the heat dissipation effect, and further improve the performance of the controller or reduce the cost of the power device. Description of the Drawings

[0019] This specification includes the following attached drawings, which respectively show:

[0020] Figure 1 It is a schematic structural diagram of the cooling device for the drive motor controller of a new energy vehicle of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of a power device;

[0022] Figure 3 It is a schematic structural diagram of a power device module;

[0023] Figure 4 It is a schematic structural diagram of a housing and a cooling structure;

[0024] Figure 5 It is a schematic structural diagram of a sealing cover;

[0025] In the figure, the markings are: 1, ceramic plate; 2, chip; 3, heat dissipation plate; 4, signal terminal; 5, cooling plate; 6, oil inlet; 7, water outlet; 8, water inlet; 9, oil outlet; 10, sealing cover; 11, sealing area; 12, first cavity; 13, second cavity; 14, first sealing structure; 15, second sealing structure. Detailed implementation manners

[0026] Next, with reference to the attached drawings, through the description of the embodiments, the specific implementation manners of the present utility model will be further described in detail. The purpose is to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present utility model, and to facilitate its implementation.

[0027] It should be noted that in the following embodiments, the so-called "first" and "second" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order, but are only for the convenience of description.

[0028] As Figures 1 to 5 shown, the present utility model provides a cooling device for a drive motor controller of a new energy vehicle, including a housing, a sealing cover 10 connected to the housing, a power device, and a cooling plate 5 connected to the power device. A first cavity 12 for accommodating a first cooling medium and the power device is formed between the sealing cover 10 and the cooling plate 5, and a second cavity 13 for accommodating a second cooling medium is formed between the housing and the cooling plate 5. The first cavity 12 and the second cavity 13 are not communicated, and the first cooling medium and the second cooling medium are two different cooling media.

[0029] Specifically, as Figure 1 shown, the housing has a hollow structure inside, and the sealing cover 10, the power device, and the cooling plate 5 are located inside the housing. As Figure 2As shown in the figure, the power device includes a ceramic plate 1, a chip 2, a heat dissipation plate 3, and a signal terminal 4. The power device has two heat dissipation surfaces at the top and bottom. The bottom is for heat dissipation through the insulating ceramic plate 1, and the top heat dissipation plate 3 is a copper sheet for heat dissipation. Heat dissipation on both sides improves the heat dissipation performance. The signal terminal 4 is connected to the drive board to control the device switch. The power device dissipates heat on both sides. One side is connected to the bottom of the chip 2 through the ceramic plate 1, and the other side is connected to the upper part of the chip 2. The whole is encapsulated with an oil-resistant insulating material.

[0030] As Figure 3 shown in the figure, the power devices are arranged in parallel according to the diagram. The number of parallel devices can be configured according to requirements to form a power module to achieve different power requirements. The power devices are connected to the cooling plate 5 by soldering or sintering. The heat generated by the chip 2 is transferred out through the cooling plate 5.

[0031] In this embodiment, the first cooling medium is cooling oil, and the second cooling medium is cooling water. The power device is cooled simultaneously to achieve the oil-water hybrid cooling of the controller, improving the performance of the controller or reducing the cost of the power device. In the first cavity 12, heat is dissipated by the direct contact between the oil and the top heat dissipation plate 3 of the chip 2 to take away the heat. In the second cavity 13, the heat generated by the chip 2 is dissipated by the heat exchange between the ceramic plate 1, the cooling plate 5 and the coolant to take away the heat. By cooling the power device simultaneously in two ways of water cooling and oil cooling, the heat dissipation performance of the chip 2 is significantly improved, and the following effects can be achieved:

[0032] The same controller device can achieve a higher current / power;

[0033] For the same current / power, the size of the chip 2 can be reduced through improved heat dissipation.

[0034] Overall, through the oil-water hybrid cooling scheme, the power target can be achieved at a lower cost or the power limit of the controller can be increased by improving the heat dissipation capacity.

[0035] As Figure 1 and Figure 4 shown in the figure, an oil inlet 6, an oil outlet 9, a water inlet 8, and a water outlet 7 are provided on the housing. The oil inlet 6 and the oil outlet 9 are communicated with the first cavity 12. The first cooling medium enters the first cavity 12 through the oil inlet 6, and the first cooling medium in the first cavity 12 is discharged through the oil outlet 9. The water inlet 8 and the water outlet 7 are communicated with the second cavity 13. The second cooling medium enters the second cavity 13 through the water inlet 8, and the second cooling medium in the second cavity 13 is discharged through the water outlet 7.

[0036] As Figure 1 、 Figure 4 and Figure 5As shown, a first sealing ring is provided between the sealing cover 10 and the housing, and a second sealing ring is provided between the cooling plate 5 and the housing. The housing is provided with a first sealing structure 14 and a second sealing structure 15. Both the first sealing structure 14 and the second sealing structure 15 are in a square shape. The first sealing ring is used to seal between the housing and the sealing cover 10 at the first sealing structure 14. The first sealing structure 14 is arranged around the first cavity 12, so that the first cooling medium can only enter the first cavity 12. The second sealing ring is used to seal between the housing and the cooling plate 5 at the second sealing structure 15. The second sealing structure 15 is arranged around the second cavity 13, so that the second cooling medium can only enter the second cavity 13.

[0037] In this embodiment, the sealing cover 10 and the cooling plate 5 are fixedly connected to the housing by screws, and the surface of the cooling plate 5 is in contact with the inner wall surface of the housing.

[0038] As Figure 1 and Figure 5 shown, the sealing area 11 on the sealing cover 10 is the area where the signal pins are exposed. The signal pins are inserted into the sealing area 11, and the sealing area 11 is sealed by potting to prevent oil from overflowing.

[0039] The above has made an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A cooling device for a drive motor controller of a new energy vehicle, characterized in that: It includes a shell, a sealing cover connected to the shell, a power device and a cooling plate connected to the power device. A first cavity for accommodating a first cooling medium and the power device is formed between the sealing cover and the cooling plate, and a second cavity for accommodating a second cooling medium is formed between the shell and the cooling plate.

2. The cooling device for the new energy vehicle drive motor controller according to claim 1 is characterized in that: A first sealing ring is arranged between the sealing cover and the housing.

3. The cooling device for the new energy vehicle drive motor controller according to claim 1 is characterized in that: The sealing cover is fixedly connected to the housing by screws.

4. The cooling device for the driving motor controller of a new energy vehicle according to any one of claims 1 to 3, characterized in that: A second sealing ring is arranged between the cooling plate and the shell.

5. The cooling device for the driving motor controller of a new energy vehicle according to any one of claims 1 to 3, characterized in that: The first cooling medium and the second cooling medium are two different cooling media.

6. The cooling device for the new energy vehicle drive motor controller according to claim 5 is characterized in that: The first cooling medium is cooling oil, and the second cooling medium is cooling water.

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