A laser welded film capacitor with liquid cooling and heat dissipation function

Abstract

The present invention discloses a laser welding film capacitor with liquid cooling and heat dissipation function, belonging to the technical field of capacitors. A laser welding film capacitor with liquid cooling and heat dissipation function comprises a mounting shell and an annular wrapping shell arranged on the mounting shell, and also comprises: a cooling cavity arranged on the bottom surface of the mounting shell; the mounting shell is symmetrically provided with a water inlet and a water outlet, the water inlet and the water outlet are connected with the cooling cavity, and the cooling cavity is provided with a rear cover; a plurality of capacitor cores are installed in the wrapping shell; the present invention can ensure that the heat dissipation effect of the entire section of the cooling cavity is optimal, and the heat dissipation efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of capacitors, and in particular to a laser welding film capacitor with liquid cooling and heat dissipation function. Background Art

[0002] The electric vehicle motor controller controls the vehicle's start-up, forward and backward speed, climbing force, auxiliary braking and other driving conditions by adjusting the motor's rotation direction, speed, angle and response time according to the vehicle's gear position, throttle, brake and other instructions, and stores part of the braking energy in the power battery. The motor controller is mainly composed of switching devices (IGBT), DC support devices (film capacitors) and vehicle controllers, and is generally assembled in a cast aluminum box, which can play a role in heat dissipation, waterproofing and high-voltage protection.

[0003] When the coolant flows, the temperature of the coolant gradually increases from the water inlet to the water outlet. At the beginning, the cooling effect on the inside of the capacitor is good, but in the middle and later stages, the cooling effect decreases because the coolant temperature has increased. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a laser welding film capacitor with liquid cooling and heat dissipation function.

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

[0006] The invention comprises a mounting shell and an annular wrapping shell arranged on the mounting shell, and also comprises: a cooling cavity arranged on the bottom surface of the mounting shell; a water inlet and a water outlet are symmetrically arranged on the mounting shell, the water inlet and the water outlet are connected with the cooling cavity, and a back cover is arranged on the cooling cavity; a plurality of capacitor cores are installed in the wrapping shell; a top plate and a bottom plate are respectively arranged in the cooling cavity, the top plate is close to the capacitor core, and the bottom plate is close to the back cover; an upper guide block is arranged on a side of the top plate close to the capacitor core, a middle guide block is arranged between the top plate and the bottom plate, and a bottom guide block is arranged on a side of the bottom plate away from the top plate; the bottom guide block, the middle guide block and the upper guide block are all arranged at one end close to the water inlet; an upper diverter plate and a bottom diverter plate are respectively arranged at one end close to the water inlet of the top plate and the bottom plate, and a plurality of groups of mutually symmetrical oblique nozzles 1 and 2 are opened in the middle section of the top plate; a drainage pipe is arranged between the top plate and the bottom plate; an oblique pipe is arranged between the top plate and the bottom plate.

[0007] Preferably, a collecting busbar is electrically connected to the plurality of capacitor cores.

[0008] Preferably, the capacitor core installed in the wrapping shell is encapsulated by an epoxy resin layer, and an inflow hole is opened on the collecting busbar.

[0009] Preferably, a sealing groove is provided on the bottom surface of the mounting shell, and a sealing ring is provided in the sealing groove.

[0010] Preferably, a drainage block is provided between the top plate and the bottom plate, a sealing strip is provided on the bottom plate, the drainage block and the sealing strip are both arranged at one end close to the water outlet, and an opening 2 is provided at one end of the bottom plate close to the water outlet.

[0011] Preferably, an opening one is provided on the top plate, the portion of the drainage pipe placed in the opening one is configured as an arc-shaped plate, the water outlet end of the drainage pipe is placed in the opening one, and a spoiler nozzle is provided on the top plate.

[0012] Preferably, a baffle is provided on the bottom plate, and the edge of the baffle is arc-shaped.

[0013] Preferably, there are two upper guide blocks, which are composed of three parts: acceleration section 3, flow stabilization section 3, and discharge section 3. The length of the upper guide block is , the length of the acceleration section three is , the length of the steady flow section three is , the length of the release section three is , then the following constraints exist:

[0014]

[0015] .

[0016] Preferably, there are two middle-layer guide blocks, which are composed of three parts: acceleration section 2, flow stabilization section 2, and release section 2. The length of the middle-layer guide block is , the length of the acceleration section 2 is , the length of the second steady flow section is , the length of the release section 2 is , then the following constraints exist:

[0017]

[0018] .

[0019] Preferably, there are two bottom guide blocks, which are composed of three parts: an acceleration section 1, a steady flow section 1, and a discharge section 1. The length of the bottom guide block is , the length of the acceleration section 1 is , the length of the steady flow section 1 is , the length of the release section 1 is , then the following constraints exist:

[0020]

[0021] .

[0022] Compared with the prior art, the present invention provides a laser welding film capacitor with liquid cooling and heat dissipation function, which has the following beneficial effects:

[0023] 1. The laser welded film capacitor with liquid cooling and heat dissipation function divides the cooling cavity into three layers of water cavity through the top plate and the bottom plate, and replenishes water to the first layer of water cavity through the second layer of water cavity and the third layer of water cavity, so as to achieve equal heat dissipation of the front, middle and rear sections of the cooling water cavity, and the heat dissipation effect is good.

[0024] 2. The laser welded film capacitor with liquid cooling and heat dissipation function pressurizes and accelerates the water flow in the three-layer water cavity through the bottom guide block, the middle guide block, and the upper guide block, so that the cooling water flow has the best heat dissipation effect on the cooling cavity.

[0025] The parts not involved in the laser welding film capacitor with liquid cooling and heat dissipation function are the same as the existing technology or can be implemented by using the existing technology. The present invention can ensure that the heat dissipation effect of the entire section of the cooling cavity is optimal and the heat dissipation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The overall structure of a laser welded film capacitor with liquid cooling and heat dissipation function proposed by the present invention is shown in FIG. Figure 1 ;

[0027] Figure 2 The overall structure of a laser welded film capacitor with liquid cooling and heat dissipation function proposed by the present invention is shown in FIG. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the internal structure of a laser welded film capacitor with liquid cooling and heat dissipation function proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the structure inside the cooling cavity of a laser-welded film capacitor with liquid cooling and heat dissipation function proposed by the present invention;

[0030] Figure 5 The invention proposes a laser welding film capacitor with liquid cooling and heat dissipation function. Figure 1 ;

[0031] Figure 6 The invention proposes a laser welding film capacitor with liquid cooling and heat dissipation function. Figure 2 ;

[0032] Figure 7 A schematic diagram of the structure of a laser welded film capacitor top plate with liquid cooling and heat dissipation function proposed by the present invention Figure 1 ;

[0033] Figure 8 A schematic diagram of the structure of a laser welded film capacitor top plate with liquid cooling and heat dissipation function proposed by the present invention Figure 2 ;

[0034] Fig. 9 This is a schematic diagram of the structure of a laser welded film capacitor bottom plate with liquid cooling and heat dissipation function proposed by the present invention;

[0035] Fig.10 A cross-sectional view of a top plate and a bottom plate of a laser welded film capacitor with liquid cooling and heat dissipation function proposed by the present invention;

[0036] Fig.11 A laser welding film capacitor with liquid cooling and heat dissipation function proposed by the present invention Fig.10 Schematic diagram of the structure with part A enlarged.

[0037] In the figure: 1. Installation shell; 2. Wrapping shell; 3. Water inlet; 4. Water outlet; 5. Composite copper busbar; 6. Epoxy resin layer; 7. Insulation film; 8. Back cover; 9. Copper busbar terminal; 10. Capacitor core; 11. Collecting busbar; 12. Opening 1; 13. Cooling cavity; 14. Connecting pin; 15. Inflow hole; 16. Sealing ring; 17. Sealing groove; 18. Top plate; 19. Bottom plate; 20. Drainage block; 21. Opening 2; 22. Oblique pipe; 23. Baffle; 24. Bottom layer Guide block; 241, acceleration section one; 242, steady flow section one; 243, release section one; 25, middle guide block; 251, acceleration section two; 252, steady flow section two; 253, release section two; 26, upper guide block; 261, acceleration section three; 262, steady flow section three; 263, release section three; 27, bottom diverter plate; 28, upper diverter plate; 29, blocking strip; 30, drainage pipe; 31, oblique nozzle one; 32, oblique nozzle two; 33, spoiler nozzle; 34, curved plate. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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.

[0040] Reference Figure 1-Figure 11 , comprising a mounting shell 1 and an annular wrapping shell 2 arranged on the mounting shell 1, and also comprising: a cooling cavity 13 arranged on the bottom surface of the mounting shell 1; a water inlet 3 and a water outlet 4 are symmetrically arranged on the mounting shell 1, the water inlet 3 and the water outlet 4 are connected to the cooling cavity 13, and a back cover 8 is arranged on the cooling cavity 13; a plurality of capacitor cores 10 are installed in the wrapping shell 2; a top plate 18 and a bottom plate 19 are respectively arranged in the cooling cavity 13, the top plate 18 is close to the capacitor core 10, and the bottom plate 19 is close to the back cover 8; an upper conductive layer is arranged on one side of the top plate 18 close to the capacitor core 10 A middle guide block 25 is arranged between the top plate 18 and the bottom plate 19, and a bottom guide block 24 is arranged on the side of the bottom plate 19 away from the top plate 18; the bottom guide block 24, the middle guide block 25, and the upper guide block 26 are all arranged at the end close to the water inlet 3; the top plate 18 and the bottom plate 19 are respectively provided with an upper diverter plate 28 and a bottom diverter plate 27 at the end close to the water inlet 3, and a plurality of groups of mutually symmetrical oblique nozzles 1 31 and oblique nozzles 2 32 are opened in the middle section of the top plate 18; a drainage pipe 30 is arranged between the top plate 18 and the bottom plate 19; an oblique pipe 22 is arranged between the top plate 18 and the bottom plate 19.

[0041] In the present invention, the water inlet 3 and the water outlet 4 are connected to the water supply equipment, and the cooling cavity 13 is divided into three layers of water cavities by the top plate 18 and the bottom plate 19. The layer closest to the rear cover 8 is defined as the third layer of water cavity, and the remaining two layers are the second layer of water cavity placed in the middle and the first layer of water cavity close to the inner wall of the cooling cavity 13. When the cooling liquid flows into the cooling cavity 13 from the water inlet 3, it enters the three layers of water cavity respectively after being diverted by the upper diverter plate 28 and the bottom diverter plate 27. The water flow entering the first layer of water cavity is accelerated by the diversion of the upper guide block 26, and the first layer of water cavity is quickly cooled and cooled. The first layer of water cavity is closest to the capacitor core 10 and the heating part of the capacitor, and can quickly dissipate the heat inside the capacitor.

[0042] When the coolant or cooling water flows, the temperature of the coolant or cooling water gradually increases from the water inlet 3 to the water outlet 4. At the beginning, the cooling effect on the inside of the capacitor is good (the front section), but in the middle and rear sections, the cooling effect decreases because the temperature of the coolant or cooling water has increased. The front, middle and rear sections here are the parts of the heat dissipation inner wall of the cooling cavity 13;

[0043] The water flow entering the second layer water cavity is accelerated by the middle layer guide block 25, and part of the water flow is sprayed into the first layer water cavity through the mutually symmetrical oblique nozzle 1 31 and oblique nozzle 2 32. Fig.10 and Fig.11 The oblique nozzle 1 31 and the oblique nozzle 2 32 are in an inverted "eight" shape. The water flow ejected from the oblique nozzle 1 31 is opposite to the water flow entering the first layer of water cavity from the water inlet 3. The two opposite water flows collide with each other, and they will form turbulence near the impact point. This turbulence is conducive to the mixing of fluids. Good fluid mixing can ensure that heat is evenly distributed in the entire fluid, thereby improving the heat dissipation efficiency. The formation of turbulence also enhances the convective heat transfer between the fluid and the heat dissipation surface. Convective heat transfer is the process of heat transfer through fluid movement. The existence of turbulence enables the fluid to contact the heat dissipation surface more effectively, thereby accelerating the transfer of heat; at the same time, the impact of the two opposite water flows together is conducive to increasing the heat dissipation area and efficiency. The turbulent area formed by the impact of two water flows actually increases the contact area between the fluid and the heat dissipation surface. Since the fluid velocity in the turbulent area is higher and the collisions between fluid molecules are more frequent, the heat can be transferred to the heat dissipation surface faster. Due to the enhancement of fluid mixing and convective heat transfer, the overall heat dissipation efficiency of the heat dissipation system will also be improved; thermal resistance is a kind of resistance in the heat transfer process, which determines the rate of heat transfer. The impact of two opposite water flows together helps to reduce thermal resistance, because the formation of turbulence makes the heat conduction between fluid molecules more efficient. The impact of two opposite water flows can ensure that the heat dissipation system can maintain a high heat dissipation efficiency under different working conditions, thereby improving the stability and reliability of the system;

[0044] The water flow ejected from the second oblique nozzle 32 has the same direction as the water flow entering the first layer of the water cavity from the water inlet 3, which can accelerate the water flow velocity and allow the water flow to take away heat faster. In addition, the water flow ejected from the first oblique nozzle 31 and the second oblique nozzle 32 has not been heated by the front section of the cooling cavity 13. Therefore, the water flow ejected from the first oblique nozzle 31 and the second oblique nozzle 32 can reduce the water flow temperature in the first layer of the water cavity, thereby ensuring that the heat dissipation effect of the front, middle and rear sections of the cooling cavity 13 is consistent.

[0045] Part of the water flow entering the second layer water cavity flows into the third layer water cavity through the drainage pipe 30, merges with the water flow flowing into the third layer water cavity from the water inlet 3, and then flows into the rear section of the cooling cavity 13 through the inclined tube 22. Since the inclined tube 22 is inclined and multiple inclined tubes 22 are distributed in a circle, the water flow sprayed by the inclined tube 22 forms a circulating water flow in the rear section of the cooling cavity 13, which increases the residence time of the cooling water flow, thereby enhancing the heat dissipation effect;

[0046] Finally, the water flows out through the water outlet 4.

[0047] The mounting shell 1 and the wrapping shell 2 are made of ALSi12Fe material.

[0048] Reference Figure 1-Figure 11 , a current collecting busbar 11 electrically connected to a plurality of capacitor cores 10; the capacitor core 10 installed in the wrapping casing 2 is encapsulated by an epoxy resin layer 6, and an inflow hole 15 is opened on the current collecting busbar 11.

[0049] In the present invention, a plurality of connecting pins 14 are provided on the current collecting busbar 11, and a plurality of groups of capacitor cores 10 are connected in series or in parallel through the connecting pins 14 on the current collecting busbar 11 to realize the electrical connection of the capacitor group. The inflow holes 15 provided on the current collecting busbar 11 facilitate the epoxy resin to better penetrate into the interior of the capacitor without leaving any dead angle for injection, so that the components inside the capacitor can be better fixed and the heat can be dissipated. The high-temperature epoxy resin is encapsulated inside the capacitor to play the role of sealing insulation and preventing water vapor from invading the interior of the capacitor.

[0050] The portion of the collecting busbar 11 extending out of the wrapping casing 2 is connected to a composite copper busbar 5 made of TU1 oxygen-free copper, and a PET insulating film 7 is hot-pressed on the composite copper busbar 5. The copper busbar terminal 9 electrically connected to the capacitor core 10 extends out of the mounting casing 1. When the copper busbar terminal 9 is connected to the SiC IGBT, laser cleaning is first used and then laser welding technology is used.

[0051] Reference Figure 1-Figure 11 A sealing groove 17 is provided on the bottom surface of the mounting housing 1 , and a sealing ring 16 is provided in the sealing groove 17 .

[0052] In the present invention, the sealing ring 16 cooperates with the sealing groove 17 to seal the cooling cavity 13 .

[0053] Reference Figure 1-Figure 11 A drainage block 20 is provided between the top plate 18 and the bottom plate 19, a sealing strip 29 is provided on the bottom plate 19, the drainage block 20 and the sealing strip 29 are both arranged at one end close to the water outlet 4, and an opening 21 is provided at one end of the bottom plate 19 close to the water outlet 4; an opening 12 is provided on the top plate 18, a portion of the drainage pipe 30 placed in the opening 12 is provided as an arc-shaped plate 34, the water outlet end of the drainage pipe 30 is placed in the opening 12, and a spoiler nozzle 33 is provided on the top plate 18.

[0054] In the present invention, the drainage block 20 guides the remaining water flow of the second layer water cavity into the third layer water cavity through the second opening 21, and the blocking strip 29 prevents the water in the third layer water cavity from flowing into the water outlet 4;

[0055] The drainage pipe 30 can guide the water flow in the third water cavity into the opening 12. The arc plate 34 bends inwardly to guide the water in the second water cavity into the opening 12. The water flows of the two layers converge and impact the first water cavity more strongly. The water spraying direction of the spoiler nozzle 33 is opposite to the water flow direction in the first water cavity, which can interfere with the water flow velocity of the first water cavity. Combined with the water flow sprayed from the opening 12, the water flow flowing through the rear section of the cooling cavity 13 is turbulent and the flow velocity is slowed down, creating conditions for the formation of a circulating water flow in the rear section of the cooling cavity 13.

[0056] Reference Figure 1-Figure 11 A baffle 23 is provided on the bottom plate 19, and the edge of the baffle 23 is arc-shaped.

[0057] In the present invention, the edge of the baffle 23 is arc-shaped, and the shape of the cooling cavity 13 at the same position is also arc-shaped. The two arcs form an accelerated water flow, which can allow the water flow to pass through by pressurization and acceleration. In this way, the water flow ejected by the inclined tube 22 has a higher flow rate and a better heat dissipation effect.

[0058] Reference Figure 1-Figure 11 There are two upper guide blocks 26, which are composed of three parts: an acceleration section 3 261, a steady flow section 3 262, and a discharge section 3 263. The length of the upper guide block 26 is , the length of the acceleration section 3 261 is , the length of the steady flow section 3 262 is , the length of the release section 3 263 is , then the following constraints exist:

[0059]

[0060] .

[0061] In the present invention, the acceleration section three 261 and the discharge section three 263 are similar to "V"-shaped tubes. The acceleration section three 261 is longer, and the flow velocity distribution of the fluid in this area is more uniform. The increase in the fluid flow velocity occurs gradually, reducing the possibility of sudden changes in flow velocity. Due to the uniform flow velocity distribution, the energy loss of the water flow in the acceleration section three 261 area is relatively small, and the fluid can pass through the area more smoothly, reducing the energy dissipation caused by turbulence and eddy currents. The water flow is pressurized and accelerated when passing through the acceleration section three 261. The steady flow section three 262 has a constant cross-sectional area, which helps to maintain the stability of the water flow. In fluid dynamics, a constant cross-sectional area can reduce the flow velocity and pressure fluctuations caused by cross-sectional changes, thereby making the flow of the entire system more stable. The discharge section three 263 is shorter than the acceleration section three 261 and the steady flow section three 262, which can optimize fluid flow and reduce turbulence. The short discharge section three 263 can reduce the noise and vibration generated when the water flows through, which helps to improve the quietness and reliability of the system and reduce the impact on the surrounding environment and equipment.

[0062] Reference Figure 1-Figure 11 There are two middle-level guide blocks 25, which are composed of three parts: an acceleration section 251, a steady flow section 252, and a release section 253. The length of the middle-level guide block 25 is , the length of the acceleration section 251 is , the length of the steady flow section 252 is , the length of the released section 253 is , then the following constraints exist:

[0063]

[0064] .

[0065] In the present invention, the second acceleration section 251 and the second discharge section 253 are similar to "V" shaped tubes. In the middle layer guide block 25, the proportion of the second acceleration section 251, the second steady flow section 252, and the second discharge section 253 is The acceleration section 251 occupies most of the length. Because the middle section of the cooling cavity 13 is relatively close, there is no other compensation channel for the second layer of the water cavity to replenish the flow. Therefore, lengthening the acceleration section 251 can meet the water pressure and flow rate requirements in the second layer of the water cavity, so that the water flow ejected from the inclined nozzle 1 31 and the inclined nozzle 2 32 has a higher flow rate, thereby enhancing the cooling effect on the middle section of the cooling cavity 13.

[0066] Reference Figure 1-Figure 11 There are two bottom guide blocks 24, which are composed of an acceleration section 241, a steady flow section 242, and a discharge section 243. The length of the bottom guide block 24 is , the length of the acceleration section 241 is , the length of the steady flow section 242 is , the length of the release section 243 is , then the following constraints exist:

[0067]

[0068] .

[0069] In the present invention, the acceleration section 241 and the discharge section 243 are similar to "V"-shaped tubes, and the acceleration section 241 and the steady flow section 242 are the longest. The steady flow section 242 regulates the water flow that is pressurized and accelerated by the acceleration section 241 more stably, so that the water flow released by the discharge section 243 has smaller noise. Since the third layer of water cavity is closest to the outside world, the noise of the entire cooling and heat dissipation system of the capacitor can be reduced.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A laser welding film capacitor with liquid cooling and heat dissipation function, comprising a mounting shell (1) and an annular wrapping shell (2) arranged on the mounting shell (1), characterized in that: Also includes: A cooling cavity (13) arranged on the bottom surface of the mounting housing (1); The installation shell (1) is symmetrically provided with a water inlet (3) and a water outlet (4), the water inlet (3) and the water outlet (4) are connected to the cooling cavity (13), and the cooling cavity (13) is provided with a rear cover (8); A plurality of capacitor cores (10) are installed in the wrapping casing (2); A top plate (18) and a bottom plate (19) are respectively provided in the cooling cavity (13), wherein the top plate (18) is close to the capacitor core (10), and the bottom plate (19) is close to the rear cover (8); An upper guide block (26) is provided on a side of the top plate (18) close to the capacitor core (10), a middle guide block (25) is provided between the top plate (18) and the bottom plate (19), and a bottom guide block (24) is provided on a side of the bottom plate (19) away from the top plate (18); The bottom layer guide block (24), the middle layer guide block (25), and the upper layer guide block (26) are all arranged at one end close to the water inlet (3); An upper splitter plate (28) and a lower splitter plate (27) are respectively provided at one end of the top plate (18) and the bottom plate (19) close to the water inlet (3), and a plurality of groups of mutually symmetrical oblique nozzles 1 (31) and oblique nozzles 2 (32) are provided in the middle section of the top plate (18); A drainage pipe (30) is provided between the top plate (18) and the bottom plate (19); An inclined tube (22) is provided between the top plate (18) and the bottom plate (19).

2. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1 is characterized in that: A current collecting busbar (11) electrically connected to the plurality of capacitor cores (10).

3. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 2 is characterized in that: The capacitor core (10) installed in the wrapping casing (2) is encapsulated by an epoxy resin layer (6), and an inflow hole (15) is provided on the current collecting busbar (11).

4. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1 is characterized in that: A sealing groove (17) is provided on the bottom surface of the mounting housing (1), and a sealing ring (16) is provided in the sealing groove (17).

5. The laser welded film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: A drainage block (20) is provided between the top plate (18) and the bottom plate (19), a sealing strip (29) is provided on the bottom plate (19), the drainage block (20) and the sealing strip (29) are both arranged at one end close to the water outlet (4), and a second opening (21) is provided at one end of the bottom plate (19) close to the water outlet (4).

6. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: The top plate (18) is provided with an opening one (12), the portion of the drainage pipe (30) disposed inside the opening one (12) is provided as an arc-shaped plate (34), the water outlet end of the drainage pipe (30) is disposed inside the opening one (12), and the top plate (18) is provided with a flow-turbulating nozzle (33).

7. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: A baffle (23) is provided on the bottom plate (19), and the edge of the baffle (23) is arc-shaped.

8. The laser welded film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: Two upper guide blocks (26) are provided, and the upper guide blocks (26) are composed of three parts: an acceleration section three (261), a flow stabilization section three (262), and a discharge section three (263). The length of the upper guide block (26) is , the length of the acceleration section three (261) is , the length of the steady flow section three (262) is , the length of the release section three (263) is , then the following constraints exist: ， 。 9. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: Two middle-layer guide blocks (25) are provided. The middle-layer guide blocks (25) are composed of three parts: an acceleration section 2 (251), a flow stabilization section 2 (252), and a discharge section 2 (253). The length of the middle-layer guide block (25) is , the length of the second acceleration section (251) is , the length of the second steady flow section (252) is , the length of the release section 2 (253) is , then the following constraints exist: ， 。 10. The laser welding film capacitor with liquid cooling and heat dissipation function according to claim 1, characterized in that: Two bottom-layer guide blocks (24) are provided. The bottom-layer guide blocks (24) are composed of three parts: an acceleration section 1 (241), a flow stabilization section 1 (242), and a discharge section 1 (243). The length of the bottom-layer guide blocks (24) is , the length of the acceleration section 1 (241) is , the length of the steady flow section 1 (242) is , the length of the release section 1 (243) is , then the following constraints exist: ， 。

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