Capacitor housing assembly and electric drive assembly

Abstract

The present invention discloses a housing assembly and an electric drive assembly for a capacitor, in which the housing assembly includes an upper cover plate, an intermediate housing, and a lower cover plate, the upper cover plate and / or the lower cover plate are provided with a first inlet and a first outlet, the upper cover plate and the lower cover plate form a first cooling passage between the upper side and the lower side of the intermediate housing, respectively, the outer side of the upper cover plate and the outer side of the lower cover plate form a second cooling passage between the power device, the first cooling passage includes a partition protrusion and a partition groove provided in the first cooling passage and extending in the longitudinal direction of the intermediate housing, the partition protrusion extends into the partition groove to partition the first cooling passage into a first inlet cooling passage and a first outlet cooling passage. The housing assembly can realize simultaneous cooling of the capacitor and the power device, and can also prevent water leakage between the water passages, thereby improving the cooling and heat dissipation effect.

Description

[Technical field]

[0001] This application claims priority to Chinese Patent Application No. 202210260548.4, entitled “Capacitor Housing Assembly and Electric Drive Assembly,” filed with the China Patent Office on March 16, 2022, the contents of which are incorporated herein by reference in their entirety. The present invention is in the field of motor controllers, and more particularly, relates to a capacitor housing assembly and an electric drive assembly. [Background technology]

[0002] Under the background of the gradually increasing power density requirements of motor controllers, maximizing the capacity of power modules can effectively reduce the number of modules used and further reduce the installation space, thus improving the power density of motor controllers. Among them, the heat dissipation environment of power modules has an important impact on whether the capacity of power modules can be maximized.

[0003] Due to the high consistency of the cooling water channel structure, a cooling water channel structure is usually provided around the power module to realize the cooling and temperature reduction of the power module, thus providing a better working environment for the power module. However, the cooling water channel structure has a tolerance problem during processing, and water leakage is likely to occur between the cooling water channels, which causes unstable pressure loss of the coolant in the cooling water channel, which seriously affects the heat dissipation effect of the power module. Summary of the Invention [Problem to be solved by the invention]

[0004] In response to the above problems, the present invention discloses a capacitor housing assembly and an electric drive assembly to overcome or at least partially alleviate the above problems. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention employs the following technical solutions.

[0006] One aspect of the present invention provides a housing assembly for a capacitor, the housing assembly including a top cover plate, an intermediate housing, and a bottom cover plate, the intermediate housing being provided with a receiving cavity for receiving the capacitor, and an outer surface of the top cover plate and an outer surface of the bottom cover plate being used for receiving a power device; a first liquid inlet and a first liquid outlet are provided in the upper cover plate and / or the lower cover plate, a first cooling passage is formed between the upper cover plate and the lower cover plate and an upper side surface and a lower side surface of the intermediate housing, respectively, and a second cooling passage is formed between the outer side surface of the upper cover plate and the outer side surface of the lower cover plate and the power device, The first cooling passage includes a partition protrusion and a partition groove provided within the first cooling passage and extending in the longitudinal direction of the intermediate housing, and the partition protrusion extends into the partition groove, dividing the first cooling passage into a first inlet cooling passage and a first outlet cooling passage.

[0007] Further, the partition groove is located on the upper side and the lower side of the intermediate housing, and the partition protrusion is located on the inner side of the upper cover plate and the inner side of the lower cover plate, Alternatively, the partition protrusions are located on the upper and lower sides of the intermediate housing, and the partition grooves are located on the inner sides of the upper and lower cover plates.

[0008] Furthermore, the inner width of the partition recessed groove and the width of the partition protrusion are equal in size.

[0009] Furthermore, a seal strip is provided in the partition groove.

[0010] Furthermore, the partition projection is provided with a guide portion that is used to guide the partition projection when it is inserted into the partition groove.

[0011] Furthermore, the intermediate housing is provided with a communicating inlet passage and a communicating outlet passage that penetrate vertically through the intermediate housing, the communicating inlet passage being used to connect the first inlet cooling passages on the upper and lower sides of the intermediate housing, and the communicating outlet passage being used to connect the first outlet cooling passages on the upper and lower sides of the intermediate housing.

[0012] Furthermore, the first liquid inlet and the first liquid outlet correspond to the positions of the inlet communication passage and the outlet communication passage, respectively.

[0013] Furthermore, the second cooling passage includes several cooling liquid tanks provided on the outer surface of the upper cover plate and the outer surface of the lower cover plate corresponding to the positions of the power devices, and a second liquid inlet port communicating with the first liquid inlet cooling passage and a second liquid outlet port communicating with the first liquid outlet cooling passage are provided at the bottom of the cooling liquid tanks.

[0014] Furthermore, the first liquid inlet and the first liquid outlet are communicated with each other via a pressure relief passage.

[0015] Another aspect of the present invention provides an electric drive assembly including a motor, a reducer and a motor controller, the motor controller employing a housing assembly as described in any one of the above claims for providing a capacitor and a power device. Effect of the Invention

[0016] The advantages and beneficial effects of the present invention are as follows: In the housing assembly of the present invention, first cooling passages are provided on both sides of the intermediate housing, thereby realizing double-sided cooling of the capacitor and improving cooling efficiency. The housing assembly further includes a second cooling passage for cooling the power device, which allows simultaneous cooling of the capacitor and the power device, while occupying a small space and having a compact structure. In addition, by providing a partition protrusion and a partition groove in the first inlet cooling passage and the first outlet cooling passage, it is possible to effectively prevent the occurrence of water leakage of the coolant in the first inlet cooling passage and the first outlet cooling passage, reduce pressure loss of the coolant, and further stabilize the flow of the coolant. [Brief description of the drawings]

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the present application. In addition, like reference numerals refer to like parts throughout the drawings.

[0018] [Figure 1] FIG. 1 is a perspective view of a housing assembly of a capacitor in one embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view of a capacitor housing assembly in one embodiment of the present invention. [Diagram 3] FIG. 3 is a longitudinal cross-sectional view of a capacitor housing assembly in one embodiment of the present invention. [Figure 4] FIG. 4 is a plan view of a mid-housing in one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below clearly and completely in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application are within the scope of protection of the present application.

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, technical solutions according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0021] In one embodiment of the present invention, a housing assembly for a capacitor is provided, and as shown in Figures 1 to 4, the housing assembly includes an upper cover plate 1, an intermediate housing 2, and a lower cover plate 3, and the upper cover plate 1 and the lower cover plate 3 are fixedly connected to the upper surface and the lower surface of the intermediate housing 2, respectively, and specifically, the fixed connection may be realized in the form of stir friction welding. In addition, the intermediate housing 2 is provided with an accommodating cavity for accommodating a capacitor, and the outer surface of the upper cover plate 1 and the outer surface of the lower cover plate 3 are used to accommodate a power device, and the housing assembly can realize the positioning of the capacitor and the power device.

[0022] Specifically, the lower cover plate 3 is provided with a first inlet 4 and a first outlet 5, the upper cover plate 1 and the lower cover plate 3 form a first cooling passage between the upper side and the lower side of the intermediate housing 2, respectively, and the first cooling passage is used to cool the capacitor provided in the intermediate housing 2, and the outer side of the upper cover plate 1 and the outer side of the lower cover plate 3 form a second cooling passage between the power device and each of them, and the second cooling passage is used to cool the power device provided in the upper cover plate 1 and the lower cover plate 3. In this way, the cooling liquid enters from the first inlet 4, then circulates through the first cooling passage and the second cooling passage, and finally flows out through the first outlet 5, thereby carrying away heat generated from the capacitor and the power device. The cooling liquid may be water or oil, or may be other cooling liquid.

[0023] Among them, the design of providing the first inlet 4 and the first outlet 5 on the lower cover plate 3 allows the coolant to flow slowly through the first cooling passage and the second cooling passage, and to perform sufficient heat exchange, making it easy for the coolant to carry away as much heat as possible. Of course, in other embodiments, the first inlet and the first outlet can be provided separately, for example, the first inlet and the first outlet are provided on the lower cover plate and the first outlet are provided on the upper cover plate. Or, the first inlet and the first outlet are both provided on the upper cover plate. Or, the first inlet and the first outlet are provided on both the upper cover plate and the lower cover plate. All of the above installations are within the scope of protection of the present invention.

[0024] Furthermore, as shown in Figures 3 and 4, the length and width of the first cooling passage are close to the length and width of the upper cover plate 1 and the lower cover plate 3, so that the contact area between the coolant in the first cooling passage and the intermediate housing 2 is extremely large, further improving heat dissipation efficiency.

[0025] The first cooling passage includes a partition protrusion 6 and a partition groove 7 provided at an intermediate position of the first cooling passage and extending in the longitudinal direction of the intermediate housing 2, the partition protrusion 6 extends into the partition groove 7, and the first cooling passage is divided into a first inlet cooling passage 8 and a first outlet cooling passage 9 by engagement between the partition protrusion 6 and the partition groove 7, and the partition protrusion 6 and the partition groove 7 are provided to engage with each other, thereby effectively preventing the occurrence of a water leakage state of the coolant in the first inlet cooling passage 8 and the first outlet cooling passage 9, reducing the pressure loss of the coolant, and further stabilizing the flow of the coolant in the first inlet cooling passage 8 and the first outlet cooling passage 9. Among them, the first inlet cooling passage 8 and the first outlet cooling passage 9 communicate with the first inlet port 4 and the first outlet port 5, respectively.

[0026] The housing assembly in this embodiment adopts a liquid cooling form, and a first cooling passage is provided on both sides of the capacitor, thereby realizing double-sided cooling of the capacitor and improving the cooling efficiency. The housing assembly further includes a second cooling passage for cooling the power devices, and the power devices are placed flat on both sides of the capacitor, thereby realizing simultaneous cooling of the capacitor and the power devices, while occupying a small space and having a compact structure, which indirectly improves the power density of the motor controller.

[0027] In one embodiment, as shown in Figure 4, a partition groove 7 is provided on both the upper and lower side surfaces of the intermediate housing 2, and a partition protrusion 6 is provided on both the inner side surface of the top cover plate 1 and the inner side surface of the bottom cover plate 3. When the top cover plate 1 and the bottom cover plate 3 are attached and fixed to the intermediate housing 2, the partition protrusions 6 located on the top cover plate 1 and the bottom cover plate 3 are inserted into the partition grooves 7 on the upper and lower side surfaces of the intermediate housing 2, respectively, thereby realizing a partition for the first cooling passage on the two side surfaces of the intermediate housing 2.

[0028] Among them, the inner width of the partition groove 7 and the width of the partition protrusion 6 are the same in size, and thus it is possible to effectively prevent the coolant from leaking from the first inlet cooling passage 8 into the first outlet cooling passage 9 through the gap between the partition groove 7 and the partition protrusion 6. Furthermore, the partition protrusion 6 is provided with a guide portion used to guide the partition protrusion 6 when it is inserted into the partition groove 7, so that the partition protrusion 6 can be easily inserted into the partition groove 7. For example, the guide portion is an arc-shaped structure or a chamfered structure at the top of the partition protrusion 6.

[0029] In addition, a sealing strip 10 is further provided in the partition groove 7. When the partition protrusion 6 is inserted into the partition groove 7, the sealing strip 10 is pressed by the top of the partition protrusion 6, thereby improving the sealing effect between the partition protrusion 6 and the partition groove 7 and further preventing water leakage.

[0030] Of course, in other embodiments, the partition protrusions can be provided on the upper and lower surfaces of the intermediate housing, and the partition grooves can be provided on the inner surfaces of the upper cover plate and the lower cover plate, in which case the partition effect of the first cooling passage can be similarly achieved.

[0031] In one embodiment, as shown in Fig. 4, the intermediate housing 2 is provided with a communicating inlet passage 11 and a communicating outlet passage 12 that pass through the intermediate housing 2 in the vertical direction, and the communicating inlet passage 11 is used to communicate two first inlet cooling passages 8 on the upper and lower sides of the intermediate housing 2, and the communicating outlet passage 12 is used to communicate two first outlet cooling passages 9 on the upper and lower sides of the intermediate housing 2. As a result, the cooling liquid in the first cooling passages between the upper cover plate 1 and the lower cover plate 3 and the intermediate housing 2 uses the same inlet and outlet port, making the cooling structure simpler. Among them, the communicating inlet passage 11 and the communicating outlet passage 12 are provided at the end of the intermediate housing 2, thereby realizing the evacuation of the condenser.

[0032] In addition, the first inlet and the first outlet correspond to the positions of the communicating inlet passage and the communicating outlet passage, respectively. This ensures that after the coolant enters the first inlet, part of it enters directly into the first cooling passage between the lower cover plate and the intermediate housing, and the other part enters the first cooling passage between the upper cover plate and the intermediate housing through the communicating inlet passage. This makes the temperature of the coolant in the first cooling passages on both the upper and lower sides of the intermediate housing approximately the same, and further makes the heat dissipation effects of the power devices on both the upper and lower sides of the capacitor and on the upper and lower sides of the intermediate housing more consistent, ensuring uniform heat dissipation.

[0033] Furthermore, the second cooling passage includes several coolant tanks 13 provided on the outer surface of the upper cover plate 1 and the outer surface of the lower cover plate 3 corresponding to the positions of the power devices, and a cooling cavity is formed by the coolant tanks 13 and the bottom of the power devices, thereby realizing cooling of the power devices. The bottom of the coolant tank 13 is provided with a second liquid inlet port 14 communicating with the first liquid inlet cooling passage 8 and a second liquid outlet port 15 communicating with the first liquid outlet cooling passage 9. In this way, the coolant in the first liquid inlet cooling passage 8 can enter the coolant tank 13 through the second liquid inlet port 14, and the coolant in the coolant tank 13 can enter the first liquid outlet cooling passage 9 from the second liquid outlet port 15 after heat exchange with the power devices.

[0034] Preferably, three cooling liquid tanks are provided on the outer surface of each of the upper cover plate and the lower cover plate, and several screw holes are provided on the outer periphery of the cooling liquid tank, and each power device is fixedly connected to the upper cover plate and the lower cover plate through the screws and the screw holes, respectively. The number and positions of the screw holes can be adjusted as required. In addition, one side of the cooling liquid tank is provided with a positioning hole used for positioning and mounting the power device. And, a seal ring is further provided between each power device and the cooling liquid tank to realize a seal between the power device and the cooling liquid tank.

[0035] In one embodiment, as shown in FIG. 2, the first inlet 4 and the first outlet 5 are connected via a pressure relief passage 16, so that when the cooling liquid enters the first inlet 4, a part of the cooling liquid can flow directly to the first outlet 5 via the pressure relief passage 16. The cooling liquid needs to be pressurized before entering the cooling structure on the housing assembly, but the pipes in the cooling structure are relatively narrow, so that the cooling liquid experiences a high pressure drop during the process of flowing through the pipes, which affects the smooth flow of the cooling liquid in the cooling structure. Therefore, by providing a pressure relief passage between the first inlet and the first outlet, the pressure drop of the cooling liquid when it enters between the first cooling passage and the second cooling passage can be reduced, allowing the cooling liquid to flow smoothly, while preventing the cooling result in the housing assembly from being impaired due to a high pressure drop, and further extending the service life of the housing assembly. For example, when the coolant enters the first inlet, 80% of the coolant enters the first inlet cooling passage and 20% of the coolant flows directly through the pressure relief passage to the first outlet and is discharged.

[0036] Specifically, the flow path of the cooling liquid in the housing assembly is as follows.

[0037] The coolant enters through the first inlet port and then splits into three routes. The coolant in the first route enters the first inlet cooling passage between the bottom cover plate and the intermediate housing, then enters the coolant tank through the second inlet port, flows into the first outlet cooling passage through the second outlet port, and finally is discharged from the first outlet port. The coolant in the second route passes through a communicating inlet passage and enters the first inlet cooling passage between the top cover plate and the intermediate housing, then enters the coolant tank through the second inlet port, flows into the first outlet cooling passage through the second outlet port, and finally flows from the communicating outlet passage to the first outlet port and is discharged. The coolant in the third route passes through a pressure relief passage and flows directly to the first outlet port and is discharged.

[0038] In another embodiment of the present invention, an electric drive assembly is provided, which includes a motor, a reducer and a motor controller, in which the motor controller adopts the housing assembly in any one of the above embodiments to provide a capacitor and a power device, and realizes cooling for the capacitor and the power device, so that the electric drive assembly has the advantages of high power density and good output performance.

[0039] The above is merely a specific embodiment of the present application, and under the above teaching of the present application, those skilled in the art can make other improvements or modifications based on the above examples. Those skilled in the art should understand that the above specific description is for better interpreting the object of the present application, and the protection scope of the present application is based on the protection scope of the claims. [Explanation of symbols]

[0040] Reference Signs List 1 upper cover plate, 2 intermediate housing, 3 lower cover plate, 4 first liquid inlet port, 5 first liquid outlet port, 6 partition protrusion, 7 partition groove, 8 first liquid inlet cooling passage, 9 first liquid outlet cooling passage, 10 seal strip, 11 communicating inlet passage, 12 communicating outlet passage, 13 cooling liquid tank, 14 second liquid inlet port, 15 second liquid outlet port, 16 pressure relief passage.

Claims

1. A housing assembly for a capacitor, the housing assembly including an upper cover plate, an intermediate housing, and a lower cover plate, the intermediate housing being provided with an accommodating cavity for accommodating the capacitor, and an outer surface of the upper cover plate and an outer surface of the lower cover plate being used for accommodating a power device; a first liquid inlet and a first liquid outlet are provided in the upper cover plate and / or the lower cover plate, a first cooling passage is formed between the upper cover plate and the lower cover plate and an upper side surface and a lower side surface of the intermediate housing, respectively, and a second cooling passage is formed between the outer side surface of the upper cover plate and the outer side surface of the lower cover plate and the power device, a first cooling passage including a partition protrusion and a partition groove provided within the first cooling passage and extending in the longitudinal direction of the intermediate housing, the partition protrusion extending into the partition groove and dividing the first cooling passage into a first inlet cooling passage and a first outlet cooling passage.

2. the partition grooves are located on the upper and lower sides of the intermediate housing, and the partition protrusions are located on the inner sides of the upper and lower cover plates; 2. The housing assembly according to claim 1, wherein the partition protrusions are located on the upper and lower sides of the intermediate housing, and the partition grooves are located on the inner sides of the upper and lower cover plates.

3. 3. The housing assembly according to claim 2, wherein an inner width of the partition groove and a width of the partition protrusion are equal in size.

4. 2. The housing assembly according to claim 1, wherein a seal strip is provided within said partition groove.

5. 2. The housing assembly according to claim 1, wherein the partition projection is provided with a guide portion that is used to guide the partition projection when it is inserted into the partition groove.

6. 2. The housing assembly according to claim 1, wherein the intermediate housing is provided with an inlet communicating passage and an outlet communicating passage that penetrate the intermediate housing in a vertical direction, the inlet communicating passage being used to communicate the first inlet cooling passages on the upper and lower sides of the intermediate housing, and the outlet communicating passage being used to communicate the first outlet cooling passages on the upper and lower sides of the intermediate housing.

7. 7. The housing assembly according to claim 6, wherein the first liquid inlet and the first liquid outlet correspond to positions of the inlet communication passage and the outlet communication passage, respectively.

8. 2. The housing assembly according to claim 1, wherein the second cooling passage includes several cooling liquid tanks provided on the outer surface of the top cover plate and the outer surface of the bottom cover plate corresponding to the positions of the power devices, and a second liquid inlet port communicating with the first liquid inlet cooling passage and a second liquid outlet port communicating with the first liquid outlet cooling passage are provided at a bottom of the cooling liquid tank.

9. 9. The housing assembly according to claim 1, wherein the first liquid inlet and the first liquid outlet are communicated with each other via a pressure relief passage.

10. An electric drive assembly comprising a motor, a reducer and a motor controller, the motor controller employing a housing assembly according to any one of claims 1 to 9 to accommodate a capacitor and a power device.

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