Annular capacitor having integrated heat dissipation device

Abstract

The present invention belongs to the technical field of heat dissipation for capacitors. Disclosed is an annular capacitor having an integrated heat dissipation device, comprising: an accommodating cavity with an annular structure formed in a housing, a core assembly being arranged in the accommodating cavity, and an accommodating space between the core assembly and the accommodating cavity; a first heat dissipation loop which is arranged in the accommodating space and is filled with a cooling liquid; a second heat dissipation loop which is arranged outside the housing, and is configured to cooperate with the first heat dissipation loop to generate heat exchange on opposite sides of the core assembly, respectively; and flow distribution mechanisms which generate heat exchange with the side of the housing away from the first heat dissipation loop and the second heat dissipation loop, and are in communication with the first heat dissipation loop and the second heat dissipation loop, respectively, wherein the first heat dissipation loop and the second heat dissipation loop form at least two circulation paths in different directions from a liquid intake end to a liquid output end by means of a pair of flow distribution mechanisms. In the present invention, the heat dissipation effect can be improved and the volume proportion of the heat dissipation device is reduced, thereby achieving efficient heat dissipation of an annular capacitor.

Description

An integrated heat dissipation device for annular capacitor Technical Field

[0001] The present invention belongs to the technical field of capacitor heat dissipation, and in particular relates to an integrated heat dissipation device for an annular capacitor. Background Art

[0002] New energy vehicles are now the inevitable path to sustainable development for the automotive industry, and drive motor controllers are developing towards high power density, high efficiency, and miniaturization. When capacitors operate in drive motor controllers, the power module also operates at high frequency and high power, enabling rapid charge and discharge, thereby achieving smoothing, filtering, and protecting the circuit. However, due to the capacitance characteristics of capacitors, the current within the capacitors is not completely smooth, but rather exhibits periodic variations over time, generating ripple current. Ripple current is the primary cause of heat generation in capacitors, and high temperatures can negatively impact the lifespan and performance of capacitors. To accommodate the higher power density and operating frequency of drive motor controllers, the need for heat dissipation devices to enhance the capacitors' resistance to high temperatures and ripple current has become a pressing issue.

[0003] Existing heat dissipation devices for capacitors are often located at the bottom or top of the capacitor, resulting in inefficient heat dissipation. Furthermore, designing heat dissipation devices at the bottom or top increases the size of the capacitor and the drive motor controller, which goes against the development trend of drive motor controllers towards high power density, high efficiency, and miniaturization. To address this issue, the present invention proposes an integrated heat dissipation device for an annular capacitor, addressing these issues. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated heat dissipation device for an annular capacitor to solve the above problems, improve the heat dissipation effect on the basis of reducing the volume share of the heat dissipation device, and achieve efficient heat dissipation of the annular capacitor.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: an annular capacitor integrated heat dissipation device, comprising:

[0006] a housing, wherein a ring-shaped accommodating cavity is formed in the housing;

[0007] A core group is arranged in the accommodating cavity, and an accommodating space is formed between the core group and the inner end surface of the shell;

[0008] a first heat dissipation loop, disposed in the accommodation area, wherein the first heat dissipation loop is filled with coolant;

[0009] a second heat dissipation loop, disposed outside the housing, configured to cooperate with the first heat dissipation loop to generate heat exchange on opposite sides of the core group;

[0010] a pair of diffusion mechanisms disposed on the housing and exchanging heat with a side of the housing away from the first heat dissipation loop and the second heat dissipation loop, the diffusion mechanisms being in communication with the first heat dissipation loop and the second heat dissipation loop, respectively; the pair of diffusion mechanisms being configured to extend away from the housing and respectively forming inlet and outlet liquid flow channels for circulating the coolant;

[0011] The first heat dissipation loop and the second heat dissipation loop respectively form circulation paths in at least two directions from the liquid inlet end to the liquid outlet end through a pair of the diffusion mechanisms.

[0012] Preferably, a pair of the diffusion mechanisms are configured to form a plurality of circumferentially distributed heat dissipation ends relative to the side wall surface of the accommodating cavity, and the pair of the diffusion mechanisms are respectively connected to the opposite sides of the first heat dissipation loop and the second heat dissipation loop, wherein, when any one of the pair of the heat dissipation mechanisms is used to pass the coolant in, the other heat dissipation mechanism is used to pass the coolant out.

[0013] Preferably, the flow dispersion mechanism includes:

[0014] A plurality of third heat dissipation channels are uniformly distributed on the outer wall surface of the inner ring of the accommodating cavity, one end of the third heat dissipation channel extends away from the shell and is used for passing coolant in / out, the other end of the third heat dissipation channel is connected to the first heat dissipation loop, and a throttling channel is integrally formed on the third heat dissipation channel, and the throttling channel is configured to be connected to the second heat dissipation loop.

[0015] Preferably, any one of the pair of diffusion mechanisms is configured to cover half of the outer wall surface of the inner ring of the accommodating cavity.

[0016] Preferably, the first heat dissipation loop includes:

[0017] A plurality of first heat dissipation channels are arranged in the accommodating area, and the plurality of first heat dissipation channels cooperate to form an annular structure circumferentially outward along the same center, and the center of the circle is located on the same axis as the center of the shell. The plurality of first heat dissipation channels are respectively connected to each other through a pair of connecting channels, and the pair of connecting channels are configured to be respectively connected to the third heat dissipation channels on a pair of the diffusion mechanisms.

[0018] Preferably, the second heat dissipation loop includes:

[0019] The second heat dissipation channel is arranged on a side outside the shell away from the first heat dissipation loop. A groove is provided on the side of the second heat dissipation channel close to the shell. The groove cooperates with the outer wall of the shell to form a sealed cavity. The third heat dissipation channel located on a pair of the heat dissipation mechanisms is respectively connected to the opposite sides of the sealed cavity.

[0020] Preferably, embedding grooves are relatively provided on the inner side walls of the groove, and the throttling flow channel is clamped with the adjacent embedding grooves.

[0021] Preferably, the housing comprises:

[0022] An outer shell, and an inner shell fixed to the outer shell, both ends of the inner shell are through ends, a plurality of the third heat dissipation channels penetrate the inner shell and contact the outer wall surface of the inner shell, and the accommodating cavity is formed between the outer shell and the inner shell, wherein the accommodating cavity is filled with a filler, and there is a height difference between the top of the filler and the top of the outer shell, and the first heat dissipation loop is configured to contact the filler.

[0023] Preferably, the core group comprises:

[0024] A plurality of capacitor cores and core insulation layers, wherein the capacitor cores are regularly arranged in the accommodating cavity, the core insulation layer covers the top of the capacitor core, a busbar is provided on one side of the core insulation layer, the busbar is connected to the capacitor core, and the busbar extends out of the shell in a direction away from the capacitor core.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] The present invention provides an annular accommodating cavity in the shell, arranges the core group in the accommodating cavity, and provides an accommodating interval between the core group and the accommodating cavity. By arranging the first heat dissipation loop in the accommodating interval, the volume increase caused by the provision of the first heat dissipation loop is reduced relative to the capacitor structure, thereby reducing the volume increase caused by the provision of the heat dissipation device. The first heat dissipation loop and the second heat dissipation loop form a heat dissipation effect on opposite sides of the core group. In addition, a diffusion mechanism is provided to exchange heat on the other side of the shell away from the first heat dissipation loop and the second heat dissipation loop, thereby effectively improving the heat dissipation effect. The diffusion mechanism also realizes the circulation of coolant for the first heat dissipation loop and the second heat dissipation loop through the provided inlet and outlet liquid flow channels, thereby achieving high-efficiency heat dissipation of the entire capacitor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0028] Figure 1 is a structural breakdown diagram of the overall device;

[0029] FIG2 is a schematic diagram of the structure of the shell and the core group when they are covered with fillers;

[0030] Figure 3 is a schematic diagram of the structure of the busbar, filler and shell in the separated state;

[0031] FIG4 is a diagram showing the connection relationship between the first heat dissipation loop and the second heat dissipation loop;

[0032] Figure 5 is a diagram showing the positional relationship between the diffuser mechanism and the inner shell;

[0033] FIG6 is a diagram showing the positional relationship between the throttling channel and the third heat dissipation channel;

[0034] FIG7 is a schematic diagram of the layout of the capacitor integrated heat dissipation device inside the motor controller;

[0035] Among them, 1. core group; 11. capacitor core; 12. core insulation layer; 2. busbar; 3. filler; 31. height difference; 4. outer shell; 41. inner shell; 51. first heat dissipation loop; 52. second heat dissipation loop; 501. first heat dissipation channel; 502. second heat dissipation channel; 503. connecting channel; 504. third heat dissipation channel; 505. liquid inlet; 506. liquid outlet; 507. throttling channel. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment: Referring to Figures 1 to 7, an annular capacitor integrated heat dissipation device includes:

[0039] A housing having an annular accommodating cavity formed therein;

[0040] The core group 1 is arranged in the accommodating cavity, and there is an accommodating space between the core group 1 and the inner end surface of the shell;

[0041] A first heat dissipation loop 51 is provided in the accommodation area and is filled with coolant;

[0042] The second heat dissipation loop 52 is arranged outside the housing and is configured to cooperate with the first heat dissipation loop 51 to generate heat exchange on opposite sides of the core group 1;

[0043] A pair of diffusers are provided on the housing and exchange heat with a side of the housing away from the first heat dissipation loop 51 and the second heat dissipation loop 52. The diffusers are in communication with the first heat dissipation loop 51 and the second heat dissipation loop 52, respectively. The pair of diffusers are configured to extend away from the housing and form inlet and outlet channels for circulating coolant.

[0044] The first heat dissipation loop 51 and the second heat dissipation loop 52 respectively form circulation paths in at least two different directions from the liquid inlet end to the liquid outlet end through a pair of diffusion mechanisms.

[0045] The present invention provides an annular accommodating cavity within the housing, arranges the core assembly 1 within the accommodating cavity, and creates an accommodating space between the core assembly 1 and the accommodating cavity. By arranging the first heat dissipation loop 51 within the accommodating space, the capacitor structure effectively mitigates the volume increase caused by the addition of the first heat dissipation loop 51, thereby reducing the volume increase caused by the installation of the heat dissipation device. Furthermore, the first heat dissipation loop 51 and the second heat dissipation loop 52 respectively provide a heat dissipation effect on opposite sides of the core assembly 1. Furthermore, the provision of a diffusion mechanism not only enables heat exchange with the other side of the housing away from the first heat dissipation loop 51 and the second heat dissipation loop 52, thereby providing a heat dissipation effect on at least three sides, effectively improving the heat dissipation effect. Furthermore, the pair of diffusion mechanisms, respectively forming inlet and outlet flow channels, connect the first heat dissipation loop 51 and the second heat dissipation loop 52, thereby forming at least two directional coolant circulation paths within the first heat dissipation loop 51 and the second heat dissipation loop 52, from the liquid inlet end to the liquid outlet end formed at the connection point. This accelerates the coolant flow rate, promotes heat dissipation, and achieves highly efficient heat dissipation of the entire capacitor structure.

[0046] Furthermore, a pair of diffusion mechanisms are configured to form a plurality of circumferentially distributed heat dissipation ends relative to the side wall of the accommodating cavity, and the pair of diffusion mechanisms are respectively connected to the opposite sides of the first heat dissipation loop 51 and the second heat dissipation loop 52, wherein when any one of the pair of heat dissipation mechanisms is used to pass the coolant in, the other heat dissipation mechanism is used to pass the coolant out.

[0047] By using a pair of diffuser mechanisms to form a diffuser mechanism, and utilizing the diffuser mechanisms to communicate with the opposite sides of the first heat dissipation loop 51 and the second heat dissipation loop 52 respectively, the pair of diffuser mechanisms can respectively pass the coolant into and out of the coolant to circulate the coolant. It can be understood that the first heat dissipation loop 51 and the second heat dissipation loop 52 respectively communicated with the pair of diffuser mechanisms are passage structures with two ends through, thereby realizing the pair of diffuser mechanisms to circulate the coolant in the first heat dissipation loop 51 and the second heat dissipation loop 52 to ensure the heat dissipation effect.

[0048] Furthermore, the dispersion mechanism includes:

[0049] A plurality of third heat dissipation channels 504 are uniformly distributed on the outer wall surface of the inner ring of the accommodating cavity. One end of one of the third heat dissipation channels 504 extends away from the shell and is used for passing coolant in / out. The other end of the third heat dissipation channel 504 is connected to the first heat dissipation loop 51. A throttling channel 507 is integrally formed on the third heat dissipation channel 504. The throttling channel 507 is configured to communicate with the second heat dissipation loop 52 and pass coolant that exceeds the flow rate in the first heat dissipation loop 51 into the second heat dissipation channel 502.

[0050] In the present technical solution, a converging channel (marked as a ring structure in the figure) is further provided on any diffuser mechanism, through which the two ends of several third heat dissipation channels 504 are connected, and the third heat dissipation channel 504 located in the middle is extended to extend out of the shell, and is connected with the coolant to form a liquid inlet 505, while the third heat dissipation channel 504 on the other diffuser mechanism is extended to extend out of the shell to form a liquid outlet 506, and the circulation of the coolant is realized by the cooperation of a pair of diffusers. In addition, any two third heat dissipation channels 504 respectively located on a pair of diffusers are connected to each other only through the first heat dissipation loop 51 and the second heat dissipation loop 52, so that while the third heat dissipation channel 504 circulates the coolant to ensure its heat dissipation effect, a coolant circulation effect is simultaneously formed on the first heat dissipation loop 51 and the second heat dissipation loop 52, thereby enhancing the heat dissipation effect, effectively accelerating the coolant circulation speed, and improving the heat dissipation efficiency.

[0051] In addition, a throttling channel 507 is provided on the third heat dissipation channel 504, which is connected to the second heat dissipation loop 52 through the throttling channel 507. Since the throttling channel 507 is connected to the second heat dissipation loop 52, while the coolant circulates in the second heat dissipation loop 52, the throttling channel 507 can pass the coolant that exceeds the flow limit in the first heat dissipation loop 51 into the second heat dissipation loop 52, so that the second heat dissipation loop 52 also provides a pressure relief buffer for the first heat dissipation loop 51. Under the premise that the second heat dissipation loop 52 is arranged outside the shell and the first heat dissipation loop 51 is arranged in the accommodating area of ​​the shell, the structural stability of the first heat dissipation loop 51 is guaranteed, and the situation that the coolant pressure is too large and causes structural damage and leakage is avoided, thereby improving the heat dissipation effect of the capacitor and enhancing the practicality of the heat dissipation device.

[0052] Furthermore, any one of the pair of diffusion mechanisms is configured to cover half of the outer wall surface of the inner circle of the accommodating cavity.

[0053] Any one of the diffusion mechanisms covers half of the outer wall of the inner ring of the accommodating cavity, so that a pair of diffusion mechanisms cooperate to cover the inner ring side wall of the accommodating cavity through a plurality of third heat dissipation channels 504, thereby enhancing the heat dissipation effect of the capacitor under the premise that the diffusion mechanism is in contact with the shell.

[0054] Furthermore, the first heat dissipation loop 51 includes:

[0055] A plurality of first heat dissipation channels 501 are arranged in the accommodating area. The plurality of first heat dissipation channels 501 cooperate to form an annular structure circumferentially outward along the same center, and the center of the circle is located on the same axis as the center of the shell. The plurality of first heat dissipation channels 501 are respectively connected to each other through a pair of connecting channels 503, and the pair of connecting channels 503 are configured to be respectively connected to the third heat dissipation channels 504 on a pair of diffusion mechanisms.

[0056] A plurality of annular first heat dissipation channels 501 are sequentially arranged along a concentric circumference outward to form an annular structure adapted to the end surface of the accommodating cavity, thereby covering the top of the core assembly 1, expanding the contact area with the core assembly 1, and enhancing the heat dissipation effect on the core assembly 1. Furthermore, the opposite sides of the plurality of annular first heat dissipation channels 501 are connected to the two third heat dissipation channels 504 located on the pair of diffuser mechanisms through a pair of connecting channels 503, thereby forming a coolant circulation loop within the plurality of first heat dissipation channels 501 along the direction from one diffuser mechanism to the other. It can be understood that the connecting channels 503 on the opposite sides are arranged symmetrically, thereby ensuring the heat dissipation effect generated by the plurality of first heat dissipation channels 501 when the coolant circulates.

[0057] Furthermore, the second heat dissipation loop 52 includes:

[0058] The second heat dissipation channel 502 is arranged on a side outside the shell away from the first heat dissipation loop 51. A groove is provided on the side of the second heat dissipation channel 502 close to the shell. The groove cooperates with the outer wall of the shell to form a sealed cavity. The third heat dissipation channel 504 located on a pair of heat dissipation mechanisms is respectively connected to the opposite sides of the groove.

[0059] 3 , the second heat dissipation channel 502 is a groove structure, and the groove is snapped onto the outer wall of the shell to form a sealed cavity. In addition, the first heat dissipation channel 502 and the first heat dissipation loop 51 are arranged on opposite sides of the shell, so that the first heat dissipation channel 501 and the second heat dissipation channel 502 respectively form a heat dissipation effect at the top and bottom of the core group 1, thereby improving the heat dissipation effect on the capacitor.

[0060] In this technical solution, the first heat dissipation channel 501 and the third heat dissipation channel 504 are both rectangular channel structures with a width of 2 mm and a height of 0.5 mm. The inner wall of the rectangular channel is provided with streamline chamfers to facilitate the circulation of the coolant. Combined with the following formula,

[0061] R e is the Reynolds number, ρ w (kg / m³) is the fluid density, v (m / s) is the fluid velocity, d (m) is the characteristic dimension (vector length), and μ (kg / ms) is the fluid viscosity. Liquid water is used as the coolant, with a maximum flow rate of 0.6 m / s, corresponding to a Reynolds number less than 2300, ensuring laminar flow within the first heat dissipation channel 501 and, therefore, ensuring effective heat dissipation.

[0062] A diversion wall (not shown in the figure) is provided at the position of the third heat dissipation channel 504 corresponding to the throttling channel 507 to ensure that the coolant flows into the groove to achieve the heat dissipation effect of the second heat dissipation channel 502.

[0063] Furthermore, embedding grooves are formed on opposite sides of the inner sidewall of the groove, and one end of the throttling channel 507 extends into the second heat dissipating channel 502 and is engaged with the adjacent embedding groove.

[0064] By opening embedding grooves on the inner wall of the groove, the throttling channel 507 on the heat dissipation mechanism is clamped and fixed in the adjacent embedding grooves, a plurality of first heat dissipation channels 501 are arranged between the top of the core group 1 and the inner wall surface of the shell, and the second heat dissipation channel 502 is clamped to the bottom end of the shell through the throttling channel 507 and the embedding grooves, thereby fixing with the capacitor structure, facilitating the installation and disassembly of the overall heat dissipation device.

[0065] Furthermore, the housing includes:

[0066] The outer shell 4 and the inner shell 41 are fixedly connected to the outer shell 4. The inner shell 41 has two through-ends. A plurality of third heat dissipation channels 504 penetrate the inner shell 41 and contact the outer wall surface of the inner shell 41. A receiving cavity is formed between the outer shell 4 and the inner shell 41. The receiving cavity is filled with a filler 3. There is a height difference 31 between the top of the filler 3 and the top of the outer shell 4. The first heat dissipation loop 51 is configured to contact the filler 3. The height difference 31 corresponds to the receiving area.

[0067] In the present technical solution, a removable end cover can be provided at the top of the shell 4 to seal the port, and the removability is preferably achieved by, but not limited to, snap-fitting, threaded connection, and bolt connection. The filler 3 is a common epoxy resin, which is cast in the accommodating cavity to prevent the core group 1 from directly contacting the first heat dissipation loop 5151 and causing a short circuit, thereby ensuring the use effect of the capacitor. By providing a height difference 31 between the filler 3 and the inner wall of the top of the shell 4, it is convenient to arrange several first heat dissipation channels 501 in an annular direction within the height difference 31 and contact the filler 3 and the inner wall surface of the top of the shell 4. By fixing the inner shell 41 to the axis of the shell 4, using the two ends of the inner shell 41 as through ends and penetrating the shell 4, it is convenient to pass the third heat dissipation channel 504 through the inner shell 41 and cover the outer wall surface of the inner shell 41 to enhance the heat dissipation effect of the core group 1. At the same time, the third heat dissipation channel 504 is also used to connect the first heat dissipation channel 501 and the second heat dissipation channel 502, thereby improving the connection stability with the shell.

[0068] Furthermore, the core group 1 includes:

[0069] Several capacitor cores 11 and core insulation layers 12 are regularly arranged in the accommodating cavity. The core insulation layer 12 covers the top of the capacitor core 11. A busbar 2 is provided on one side of the core insulation layer 12. The busbar 2 is connected to the capacitor core 11, and the busbar 2 extends out of the shell in a direction away from the capacitor core 11.

[0070] Several capacitor cores 11 are arranged regularly, covered and installed in the accommodating cavity by the core insulation layer 12, covered by the filling layer, and the busbar 2 extending out of the shell is used to ensure that the capacitor core 11 is in a normal working state. It can be understood that several third heat dissipation channels 504 are set in the inner circle of the inner shell 41, which can effectively avoid contact with the busbar 2 and cause a structural short circuit.

[0071] The working process of this embodiment is as follows:

[0072] 5 , the shell is arranged in the motor controller, and the liquid inlet 505 and the liquid outlet 506 formed on the third heat dissipation channel 504 are respectively connected to the external coolant. After the coolant enters the third heat dissipation channel 504 through the liquid inlet 505, it enters the second heat dissipation channel 502 through the throttling channel 507, and at the same time enters the first heat dissipation channel 501 along the third heat dissipation channel 504. During the process, the third heat dissipation channel 504 and the first heat dissipation channel 501 and the second heat dissipation channel 502 simultaneously perform heat dissipation, thereby achieving efficient heat dissipation of the capacitor, and ensuring the structural stability of the first heat dissipation channel 501 through the second heat dissipation channel 502, and arranging the first heat dissipation channel 501 through the height difference 31 between the filler 3 and the shell 4, thereby achieving efficient heat dissipation while effectively reducing the volume share generated by the setting of the heat dissipation device 5.

[0073] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An integrated heat dissipation device for a ring capacitor, characterized in that, Comprising: A housing, within which an annular accommodation cavity is formed; A core group (1), arranged within the accommodation cavity, and there is an accommodation interval between the core group (1) and the inner end face of the housing; A first heat dissipation loop (51), disposed within the accommodation interval, and the first heat dissipation loop (51) is filled with a coolant; A second heat dissipation loop (52), arranged outside the housing, and the second heat dissipation loop (52) is configured to cooperate with the first heat dissipation loop (51) to generate heat exchange on opposite sides of the core group (1) respectively; A pair of fluid dispersion mechanisms, arranged on the housing and generating heat exchange with a side of the housing away from the first heat dissipation loop (51) and the second heat dissipation loop (52), the fluid dispersion mechanisms are respectively communicated with the first heat dissipation loop (51) and the second heat dissipation loop (52), and the pair of fluid dispersion mechanisms are configured to extend in a direction away from the housing and respectively form inlet / outlet fluid channels for circulating the coolant; Wherein, the first heat dissipation loop (51) and the second heat dissipation loop (52) respectively form at least two different-direction circulation paths from the inlet end to the outlet end through the pair of fluid dispersion mechanisms.

2. The annular capacitor integrated heat dissipation device according to claim 1, characterized in that: The pair of fluid dispersion mechanisms are configured to have a plurality of circumferentially distributed heat dissipation ends with respect to the side wall surface of the accommodation cavity, and the pair of fluid dispersion mechanisms are respectively communicated with opposite sides of the first heat dissipation loop (51) and the second heat dissipation loop (52). Among them, when any one of the pair of heat dissipation mechanisms is used to introduce the coolant, the other heat dissipation mechanism is used to discharge the coolant.

3. The annular capacitor integrated heat dissipation device according to claim 1, wherein: The fluid dispersion mechanism includes: A plurality of third heat dissipation channels (504), uniformly distributed on the outer wall surface of the inner circle of the accommodation cavity. One end of the plurality of third heat dissipation channels (504) extends in a direction away from the housing for introducing / discharging the coolant, the other end of the third heat dissipation channel (504) is communicated with the first heat dissipation loop (51), and a throttling channel (507) is integrally formed on the third heat dissipation channel (504), and the throttling channel (507) is configured to be communicated with the second heat dissipation loop (52).

4. The annular capacitor integrated heat dissipation device according to claim 1, wherein: Any one of the pair of fluid dispersion mechanisms is configured to cover half of the outer wall surface of the inner circle of the accommodation cavity.

5. The annular capacitor integrated heat dissipation device according to claim 3, wherein The first heat dissipation loop (51) includes: A plurality of first heat dissipation channels (501), arranged within the accommodation interval. The plurality of first heat dissipation channels (501) cooperate to form an annular structure circumferentially outward along the same center, and its center is on the same axis as the center of the housing. The plurality of first heat dissipation channels (501) are respectively communicated with each other through a pair of connecting channels (503), and the pair of connecting channels (503) are configured to be respectively communicated with the third heat dissipation channels (504) on the pair of fluid dispersion mechanisms.

6. The annular capacitor integrated heat dissipation device according to claim 3, characterized in that, The second heat dissipation loop (52) includes: The second heat dissipation channel (502) is arranged on one side of the housing away from the first heat dissipation loop (51). A groove is formed on the side of the second heat dissipation channel (502) close to the housing. The groove and the outer wall of the housing cooperate to form a sealed cavity. The third heat dissipation channels (504) located on a pair of the heat dissipation mechanisms are respectively communicated with the opposite sides of the groove.

7. The annular capacitor integrated heat dissipation device according to claim 6, characterized in that: Insertion grooves are oppositely formed on the inner side wall of the groove. The throttling channel (507) is clamped with the adjacent insertion groove.

8. The annular capacitor integrated heat dissipation device according to claim 3, characterized in that, The housing includes: An outer shell (4) and an inner shell (41) fixedly connected to the outer shell (4). Both ends of the inner shell (41) are through ends. A plurality of the third heat dissipation channels (504) penetrate through the inner shell (41) and are in contact with the outer wall surface of the inner shell (41). An accommodation cavity is formed between the outer shell (4) and the inner shell (41). Wherein, a filler (3) is filled in the accommodation cavity. There is a height difference (31) between the top end of the filler (3) and the top end of the outer shell (4). The first heat dissipation loop (51) is configured to be arranged in the height difference (31) and in contact with the filler (3).

9. The annular capacitor integrated heat dissipation device according to claim 1, characterized in that The core group (1) includes: A plurality of capacitor cores (11) and a core insulation layer (12). The plurality of capacitor cores (11) are regularly arranged in the accommodation cavity. The core insulation layer (12) covers the top ends of the capacitor cores (11). A bus bar (2) is arranged on one side of the core insulation layer (12). The bus bar (2) is connected to the capacitor cores (11), and the bus bar (2) extends out of the housing along the direction away from the capacitor cores (11).

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