A capacitor housing assembly and electrical drive assembly

Abstract

The application discloses a capacitor shell assembly and an electric drive assembly. The shell assembly comprises an upper cover plate, a middle shell and a lower cover plate. The upper cover plate and / or the lower cover plate are provided with a first liquid inlet and a first liquid outlet. The upper cover plate and the lower cover plate are respectively formed with a first cooling channel with the upper side and the lower side of the middle shell. The outer side of the upper cover plate and the outer side of the lower cover plate are respectively formed with a second cooling channel with the power device. The first cooling channel comprises a separation protrusion and a separation groove arranged in the first cooling channel and extending in the length direction of the middle shell. The separation protrusion extends into the separation groove and separates the first cooling channel into a first liquid inlet cooling channel and a first liquid outlet cooling channel. The shell assembly can simultaneously cool the capacitor and the power device, and can prevent water channeling between the water channels, and has better cooling and heat dissipation effects.

Description

Technical Field

[0001] This invention belongs to the field of motor controller technology, and specifically relates to a capacitor housing assembly and an electric drive assembly. Background Technology

[0002] With the increasing power density requirements of motor controllers, maximizing the capabilities of power modules will effectively reduce the number of modules needed, thereby reducing installation space and increasing the power density of the motor controller. The heat dissipation environment of the power modules has a significant impact on whether their capabilities can be maximized.

[0003] Because of the high consistency required for cooling channel structures, cooling channels are typically placed around the power module to cool it down, providing a better operating environment. However, due to tolerance issues during the manufacturing process, water leakage can easily occur between cooling channels, leading to unstable coolant pressure loss and severely impacting the power module's heat dissipation performance. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a capacitor housing assembly and an electric drive assembly to overcome or at least partially solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The present invention provides a capacitor housing assembly, the housing assembly including an upper cover plate, an intermediate housing and a lower cover plate; the intermediate housing is provided with a receiving cavity for accommodating the capacitor, and the outer side surfaces of the upper cover plate and the lower cover plate are used to mount power devices;

[0007] The upper cover plate and / or the lower cover plate are provided with a first liquid inlet and a first liquid outlet. The upper cover plate and the lower cover plate form a first cooling channel with 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 channel with the power device.

[0008] The first cooling channel includes a dividing protrusion and a dividing groove disposed within the first cooling channel and extending along the length of the intermediate housing. The dividing protrusion extends into the dividing groove and divides the first cooling channel into a first liquid inlet cooling channel and a first liquid outlet cooling channel.

[0009] Furthermore, the dividing groove is located on the upper and lower sides of the intermediate housing, and the dividing protrusion is located on the inner side of the upper cover plate and the inner side of the lower cover plate;

[0010] Alternatively, the dividing protrusions are located on the upper and lower sides of the intermediate housing, and the dividing grooves are located on the inner sides of the upper cover and the lower cover.

[0011] Furthermore, the width of the dividing groove is the same as the width of the dividing protrusion.

[0012] Furthermore, a sealing strip is provided within the partition groove.

[0013] Furthermore, the dividing protrusion is provided with a guide portion for guiding the dividing protrusion when it is inserted into the dividing groove.

[0014] Furthermore, the intermediate housing is provided with a longitudinally penetrating inlet channel and an outlet channel. The inlet channel is used to connect the first liquid inlet cooling channel on the upper side and the lower side of the intermediate housing, and the outlet channel is used to connect the first liquid outlet cooling channel on the upper side and the lower side of the intermediate housing.

[0015] Furthermore, the first liquid inlet and the first liquid outlet correspond to the positions of the connecting inlet channel and the connecting outlet channel, respectively.

[0016] Furthermore, the second cooling channel includes a plurality of coolant tanks disposed on the outer side of the upper cover plate and the outer side of the lower cover plate and corresponding to the positions of the power devices. The bottom of the coolant tank is provided with a second inlet communicating with the first inlet cooling channel and a second outlet communicating with the first outlet cooling channel.

[0017] Furthermore, the first liquid inlet and the first liquid outlet are connected by a pressure relief channel.

[0018] In another aspect, the present invention provides an electric drive assembly, the electric drive assembly including a motor, a reducer and a motor controller, wherein the motor controller uses a housing assembly as described in any of the preceding claims to house capacitors and power devices.

[0019] The advantages and beneficial effects of this invention are:

[0020] In the housing assembly of the present invention, by providing first cooling channels on both sides of the middle housing, double-sided cooling of the capacitor is achieved, resulting in higher cooling efficiency. Furthermore, the housing assembly also provides a second cooling channel for cooling power devices, enabling simultaneous cooling of the capacitor and power devices, while occupying little space and having a compact structure. In addition, by providing separating protrusions and separating grooves in the first liquid inlet cooling channel and the first liquid outlet cooling channel, water leakage in the first liquid inlet cooling channel and the first liquid outlet cooling channel can be effectively prevented, reducing the pressure loss of the coolant and thus making the flow of the coolant more stable. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a perspective structural view of the capacitor housing assembly in one embodiment of the present invention;

[0023] Figure 2 This is a bottom view of the capacitor housing assembly in one embodiment of the present invention;

[0024] Figure 3 This is a longitudinal anatomical view of the capacitor housing assembly in one embodiment of the present invention;

[0025] Figure 4 This is a top view of the intermediate housing in one embodiment of the present invention.

[0026] In the diagram: 1. Upper cover plate; 2. Middle shell; 3. Lower cover plate; 4. First liquid inlet; 5. First liquid outlet; 6. Separating protrusion; 7. Separating groove; 8. First liquid inlet cooling channel; 9. First liquid outlet cooling channel; 10. Sealing strip; 11. Connecting inlet channel; 12. Connecting outlet channel; 13. Coolant tank; 14. Second liquid inlet; 15. Second liquid outlet; 16. Pressure relief channel. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] One embodiment of the present invention provides a capacitor housing assembly, such as... Figures 1-4As shown, the housing assembly includes an upper cover plate 1, a middle housing 2, and a lower cover plate 3. The upper cover plate 1 and the lower cover plate 3 are fixedly connected to the upper and lower sides of the middle housing 2, respectively, and the fixed connection can be achieved by friction stir welding. In addition, the middle housing 2 is provided with a receiving cavity for accommodating capacitors. The outer side of the upper cover plate 1 and the outer side of the lower cover plate 3 are used to set power devices. The housing assembly can realize the positioning of capacitors and power devices.

[0030] Specifically, the lower cover plate 3 is provided with a first liquid inlet 4 and a first liquid outlet 5. The upper cover plate 1 and the lower cover plate 3 form first cooling channels with the upper and lower sides of the intermediate housing 2, respectively. These first cooling channels are used to cool the capacitors housed within the intermediate housing 2. Second cooling channels are formed between the outer sides of the upper cover plate 1 and the lower cover plate 3 and the power devices. These second cooling channels are used to cool the power devices mounted on the upper cover plate 1 and the lower cover plate 3. Thus, the coolant enters through the first liquid inlet 4, circulates through the first and second cooling channels, and finally flows out through the first liquid outlet 5, thereby carrying away the heat generated by the capacitors and power devices. The coolant can be water, oil, or other cooling liquids.

[0031] The design of providing a first liquid inlet 4 and a first liquid outlet 5 on the lower cover plate 3 facilitates the slow flow of coolant in the first and second cooling channels, enabling sufficient heat exchange and allowing the coolant to remove as much heat as possible. Of course, in other embodiments, the first liquid inlet and the first liquid outlet can be provided separately. For example, the first liquid inlet can be located on the lower cover plate and the first liquid outlet on the upper cover plate; or both the first liquid inlet and the first liquid outlet can be located on the upper cover plate; or both the upper and lower cover plates can have a first liquid inlet and a first liquid outlet. All of the above configurations are within the protection scope of this invention.

[0032] Furthermore, such as Figure 3 and Figure 4 As shown, the length and width of the first cooling channel are close to the length and width of the upper cover plate 1 and the lower cover plate 3, so that the coolant in the first cooling channel has a large contact area with the intermediate shell 2, thereby improving the heat dissipation efficiency.

[0033] Furthermore, the first cooling channel includes a dividing protrusion 6 and a dividing groove 7 located in the middle of the first cooling channel and along the length of the intermediate housing 2. The dividing protrusion 6 extends into the dividing groove 7. Through the cooperation of the dividing protrusion 6 and the dividing groove 7, the first cooling channel is divided into a first liquid inlet cooling channel 8 and a first liquid outlet cooling channel 9. The cooperation of the dividing protrusion 6 and the dividing groove 7 can effectively prevent water leakage in the first liquid inlet cooling channel 8 and the first liquid outlet cooling channel 9, reduce the pressure loss of the coolant, and thus make the flow of coolant in the first liquid inlet cooling channel 8 and the first liquid outlet cooling channel 9 more stable. The first liquid inlet cooling channel 8 and the first liquid outlet cooling channel 9 are respectively connected to the first liquid inlet 4 and the first liquid outlet 5.

[0034] In this embodiment, the housing assembly adopts liquid cooling. By setting a first cooling channel on both sides of the capacitor, double-sided cooling of the capacitor is achieved, resulting in higher cooling efficiency. Furthermore, the housing assembly is also provided with a second cooling channel for cooling power devices. Since each power device is laid flat on both sides of the capacitor, the capacitor and power devices are cooled simultaneously. It also occupies little space and has a compact structure, indirectly improving the power density of the motor controller.

[0035] In one embodiment, such as Figure 4 As shown, the upper and lower sides of the intermediate housing 2 are provided with partition grooves 7, and the inner sides of the upper cover plate 1 and the lower cover plate 3 are provided with partition protrusions 6. When the upper cover plate 1 and the lower cover plate 3 are assembled and fixed on the intermediate housing 2, the partition protrusions 6 located on the upper cover plate 1 and the lower cover plate 3 are inserted into the partition grooves 7 on the upper and lower sides of the intermediate housing 2 respectively, thereby separating the first cooling channels on the two sides of the intermediate housing 2.

[0036] The width of the dividing groove 7 is the same as the width of the dividing protrusion 6. This effectively prevents coolant from flowing from the first inlet cooling channel 8 into the first outlet cooling channel 9 through the gap between the dividing groove 7 and the dividing protrusion 6. Furthermore, the dividing protrusion 6 is provided with a guide portion to guide the dividing protrusion 6 when it is inserted into the dividing groove 7, thus facilitating its insertion. For example, this guide portion can be an arc-shaped structure or a chamfered structure at the top of the dividing protrusion 6.

[0037] Furthermore, a sealing strip 10 is provided in the partition groove 7. When the partition protrusion 6 is inserted into the partition groove 7, the top of the partition protrusion 6 presses against the sealing strip 10, which improves the sealing effect between the partition protrusion 6 and the partition groove 7 and further prevents water leakage.

[0038] Of course, in other embodiments, the dividing protrusions can also be provided on the upper and lower sides of the intermediate housing, and the dividing grooves can be provided on the inner sides of the upper cover and the lower cover, which can also achieve the dividing effect of the first cooling channel.

[0039] In one embodiment, such as Figure 4 As shown, the intermediate housing 2 is provided with a longitudinally penetrating inlet channel 11 and an outlet channel 12. The inlet channel 11 connects two first liquid inlet cooling channels 8 on the upper and lower sides of the intermediate housing 2, and the outlet channel 12 connects two first liquid outlet cooling channels 9 on the upper and lower sides of the intermediate housing 2. This allows the coolant in the first cooling channels between the upper cover plate 1 and the lower cover plate 3 and the intermediate housing 2 to use the same inlet and outlet ports, simplifying the cooling structure. The inlet channel 11 and outlet channel 12 are located at the ends of the intermediate housing 2, thus avoiding the need for capacitors.

[0040] In addition, the first liquid inlet and the first liquid outlet correspond to the positions of the connecting inlet channel and the connecting outlet channel, respectively. This ensures that after the coolant enters the first liquid inlet, part of it directly enters the first cooling channel between the lower cover plate and the middle shell, while the other part enters the first cooling channel between the upper cover plate and the middle shell through the connecting inlet channel. This makes the temperature of the coolant in the first cooling channels on both the upper and lower sides of the middle shell basically the same, thereby making the heat dissipation effect of the power devices on both the upper and lower sides of the capacitor and the upper and lower sides of the middle shell more consistent and ensuring the uniformity of heat dissipation.

[0041] Furthermore, the second cooling channel includes several coolant tanks 13 disposed on the outer side of the upper cover plate 1 and the outer side of the lower cover plate 3, corresponding to the positions of the power devices. The coolant tanks 13 and the bottom of the power devices form a cooling cavity, which can cool the power devices. The bottom of the coolant tank 13 is provided with a second inlet 14 communicating with the first inlet cooling channel 8 and a second outlet 15 communicating with the first outlet cooling channel 9. In this way, the coolant in the first inlet cooling channel 8 can enter the coolant tank 13 through the second inlet 14, and after heat exchange with the power devices, the coolant in the coolant tank 13 enters the first outlet cooling channel 9 through the second outlet 15.

[0042] Preferably, three coolant reservoirs are provided on the outer surfaces of the upper and lower cover plates, and several screw holes are provided on the outer periphery of the coolant reservoirs. Each power device is fixedly connected to the upper and lower cover plates by screws and screw holes. The number and position of the screw holes can be adjusted as needed. In addition, a positioning hole is provided on one side of the coolant reservoir for positioning and installing the power devices. Furthermore, to achieve a seal between the power devices and the coolant reservoirs, a sealing ring is provided between each power device and the coolant reservoir.

[0043] In one embodiment, such as Figure 2 As shown, the first inlet 4 and the first outlet 5 are connected by a pressure relief channel 16, allowing some coolant to flow directly to the first outlet 5 through the pressure relief channel 16 when it enters the first inlet 4. Since the coolant needs to be pressurized before entering the cooling structure on the housing assembly, and the pipes within the cooling structure are relatively narrow, a high pressure drop occurs during coolant flow, affecting its smooth flow within the cooling structure. Therefore, a pressure relief channel is provided between the first inlet and the first outlet. This reduces the pressure drop between the coolant entering the first and second cooling channels, ensuring smooth coolant flow. Furthermore, it prevents damage to the cooling structure within the housing assembly from the high pressure drop, thereby extending the service life of the housing assembly. For example, when coolant enters the first inlet, 80% of the coolant enters the first inlet cooling channel, and 20% flows directly to the first outlet through the pressure relief channel.

[0044] The specific flow path of the coolant in the housing assembly is as follows:

[0045] After entering through the first inlet, the coolant is divided into three streams. The first stream enters the first inlet cooling channel between the lower cover and the intermediate shell, then enters the coolant tank through the second inlet, flows into the first outlet cooling channel through the second outlet, and finally exits through the first outlet. The second stream enters the first inlet cooling channel between the upper cover and the intermediate shell through a connecting inlet channel, then enters the coolant tank through the second inlet, flows into the first outlet cooling channel through the second outlet, and finally exits through the connecting outlet channel to the first outlet. The third stream flows directly to the first outlet through a pressure relief channel for discharge.

[0046] In another embodiment of the present invention, an electric drive assembly is provided, which includes a motor, a reducer and a motor controller. The motor controller uses the housing assembly of any of the above embodiments to house the capacitor and power devices and to cool the capacitor and power devices, so that the electric drive assembly has the advantages of high power density and good output performance.

[0047] The above description is merely a specific embodiment of the present invention. Under the teachings of the present invention, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A capacitor housing assembly, characterized in that, The housing assembly includes an upper cover plate, a middle housing, and a lower cover plate; the middle housing has a receiving cavity for accommodating the capacitor, and the outer surfaces of the upper cover plate and the lower cover plate are used to mount power devices; The upper cover plate and / or the lower cover plate are provided with a first liquid inlet and a first liquid outlet. The upper cover plate and the lower cover plate form a first cooling channel with 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 channel with the power device. The first cooling channel includes a dividing protrusion and a dividing groove disposed within the first cooling channel and extending in the length direction of the intermediate housing. The dividing protrusion extends into the dividing groove and divides the first cooling channel into a first liquid inlet cooling channel and a first liquid outlet cooling channel. The specific flow path of the coolant in the housing assembly is as follows: after entering through the first inlet, the coolant is divided into three paths. The first path of coolant enters the first inlet cooling channel between the lower cover plate and the middle housing, then enters the coolant tank through the second inlet, then flows into the first outlet cooling channel through the second outlet, and finally exits through the first outlet. The second coolant enters the first inlet cooling channel between the upper cover and the middle shell through the connecting inlet channel, then enters the coolant tank through the second inlet, then flows into the first outlet cooling channel through the second outlet, and finally flows to the first outlet for discharge through the connecting outlet channel. The third coolant flows directly to the first outlet through the pressure relief channel for discharge.

2. The housing assembly according to claim 1, characterized in that, The dividing groove is located on the upper and lower sides of the intermediate housing, and the dividing protrusion is located on the inner side of the upper cover plate and the inner side of the lower cover plate. Alternatively, the dividing protrusions are located on the upper and lower sides of the intermediate housing, and the dividing grooves are located on the inner sides of the upper cover and the lower cover.

3. The housing assembly according to claim 2, characterized in that, The width of the dividing groove is the same as the width of the dividing protrusion.

4. The housing assembly according to claim 1, characterized in that, A sealing strip is provided inside the dividing groove.

5. The housing assembly according to claim 1, characterized in that, The dividing protrusion is provided with a guide portion for guiding the dividing protrusion when it is inserted into the dividing groove.

6. The housing assembly according to claim 1, characterized in that, The intermediate shell is provided with a longitudinally penetrating inlet channel and an outlet channel. The inlet channel is used to connect the first liquid inlet cooling channel on the upper side and the lower side of the intermediate shell, and the outlet channel is used to connect the first liquid outlet cooling channel on the upper side and the lower side of the intermediate shell.

7. The housing assembly according to claim 6, characterized in that, The first liquid inlet and the first liquid outlet correspond to the positions of the connecting inlet channel and the connecting outlet channel, respectively.

8. The housing assembly according to claim 1, characterized in that, The second cooling channel includes a plurality of coolant tanks disposed on the outer side of the upper cover plate and the outer side of the lower cover plate and corresponding to the position of the power device. The bottom of the coolant tank is provided with a second inlet communicating with the first inlet cooling channel and a second outlet communicating with the first outlet cooling channel.

9. The housing assembly according to any one of claims 1-8, characterized in that, The first liquid inlet and the first liquid outlet are connected by a pressure relief channel.

10. An electric drive assembly, characterized in that, The electric drive assembly includes a motor, a reducer, and a motor controller, wherein the motor controller uses a housing assembly as described in any one of claims 1-9 to house capacitors and power devices.

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