A liquid cooling structure and cooling control method for a high-power DC charging pile of an electric vehicle

Abstract

The present application relates to a liquid cooling structure for a high-power DC charging pile for electric vehicles and a cooling control method thereof, which relates to the field of electric vehicle charging piles. The structure includes a circulating power unit, a cooling heat exchange unit, a circulation pipeline, and a heat exchange plate. The heat exchange plate is laid on a heating module, a heat exchange cavity is provided in the heat exchange plate, and the circulation pipeline is connected to the heat exchange cavity via a connecting unit. The cooling heat exchange unit stores coolant and is capable of cooling the coolant. The side of the heat exchange cavity close to the heating module is provided as a heat exchange surface. The heat exchange surface is divided into N (N is an integer greater than 1) heat exchange zones along the direction of coolant flow in the heat exchange cavity. The heat exchange plate is provided with N layered units in the heat exchange cavity. The layered units are used to layer the coolant flowing into the heat exchange cavity and guide it to the heat exchange surface for heat exchange. The present application has the effect of increasing the heat exchange area between the coolant and the heating module, thereby improving the heat dissipation efficiency of the heating module and improving the heat dissipation effect.

Description

Technical Field

[0001] The present application relates to the field of electric vehicle charging piles, and in particular to a liquid cooling structure of a high-power DC charging pile for electric vehicles and a cooling control method thereof. Background Art

[0002] As a key device for fast-charging electric vehicles, DC charging piles rely on complex power electronics systems and efficient energy conversion processes for high efficiency and speed. However, high-power operation generates significant heat within the DC charging piles. Failure to effectively manage and dissipate this heat can severely impact the performance, lifespan, and safety of the equipment.

[0003] The existing cooling method is to use coolant to flow in a circular pipe in contact with the heating module, conduct heat from the heat source device to the heat sink, and then use the coolant to take away the heat to complete the heat dissipation of the heating module in the charging pile. However, due to the limited contact area between the circular pipe and the heating module, the heat dissipation efficiency of the heating module is low and the heat dissipation effect is poor. Summary of the Invention

[0004] In order to improve the problem of limited contact area between the circular pipe and the heating module, resulting in low heat dissipation efficiency and poor heat dissipation effect of the heating module, the present application provides a liquid cooling structure of a high-power DC charging pile for electric vehicles and a cooling control method thereof.

[0005] On the one hand, the present application provides a liquid cooling structure for a high-power DC charging pile for electric vehicles, which adopts the following technical solutions:

[0006] A liquid cooling structure for a high-power DC charging pile for electric vehicles includes a circulating power unit, a cooling and heat exchange unit, a circulating pipeline, and a heat exchange plate. The heat exchange plate is laid on a heating module, a heat exchange cavity is defined in the heat exchange plate, and the circulating pipeline is connected to the heat exchange cavity via a connecting unit. The cooling and heat exchange unit contains coolant and is capable of cooling the coolant. The circulating power unit is capable of transporting the coolant to the heat exchange cavity via the circulating pipeline. The coolant entering the heat exchange cavity exchanges heat with the heating module through the heat exchange plate and then flows back to the cooling and heat exchange unit via the circulating pipeline.

[0007] The side of the heat exchange cavity close to the heating module is set as a heat exchange surface. The heat exchange surface is divided into N (N is an integer greater than 1) heat exchange zones along the direction of flow of the coolant in the heat exchange cavity. The heat exchange plate is provided with N stratification units in the heat exchange cavity. The stratification units are used to stratify the coolant flowing into the heat exchange cavity and guide it to the heat exchange surface for heat exchange. The coolant after heat exchange is respectively guided to the outlet of the heat exchange cavity through the guiding units.

[0008] By adopting the above technical solution, when cooling the charging pile, the circulating power unit transports the coolant in the cooling heat exchange unit to the heat exchange cavity through the connecting unit. After the coolant is layered by the stratification unit, it flows to the corresponding heat exchange area and performs heat exchange between the heat exchange plate and the heating module. The coolant after heat exchange with the heating module is guided to the outlet of the heat exchange cavity by the guiding unit, and circulated to the cooling heat exchange unit through the circulation pipeline for cooling. By repeating the above process, the charging pile can be continuously cooled. By contacting the entire heat exchange plate with the heating module, the heat exchange area between the coolant and the heating module can be increased, thereby improving the heat dissipation efficiency of the heating module and improving the heat dissipation effect.

[0009] In a specific embodiment, the stratified unit includes stratified plates, one end of each of the N stratified plates is located at the inlet of the heat exchange cavity, and the other end is fixedly connected to the heat exchange surface, dividing the heat exchange surface into several heat exchange zones.

[0010] By adopting the above technical solution, the layered plate will layer the coolant flowing into the heat exchange chamber, and then guide the layered coolant to the corresponding heat exchange area to exchange heat with the heating module, so that the heat exchange between the coolant and the heating module is more thorough, thereby improving the heat dissipation effect of the heating module.

[0011] In a specific possible implementation scheme, the guide unit includes a guide tube and a connecting tube, and N layered plates divide the heat exchange chamber into a reflux chamber connected to the heat exchange chamber outlet and N cooling chambers connected to the heat exchange chamber inlet. The layered plates adjacent to the reflux chamber are connected to the reflux chamber through the guide tube, and the remaining layered plates are connected to the reflux chamber through the connecting tube.

[0012] By adopting the above technical solution, the coolant after heat exchange in the cooling cavity flows back to the reflux cavity through the guide pipe and the connecting pipe, thereby reducing the mutual influence between the coolants after heat exchange in different cooling cavities and improving the cooling effect of the coolant in each cooling cavity on the heating module.

[0013] In a specific embodiment, the connecting pipe includes an inner pipe and an outer pipe, and a heat insulation cavity is provided between the inner pipe and the outer pipe.

[0014] By adopting the above technical solution, the heat insulation cavity formed between the inner tube and the outer tube can reduce the heat exchange effect between the coolant after heat exchange in the cooling cavity and the coolant in other cooling cavities when it flows back to the reflux cavity, thereby reducing the impact of the coolant on the coolant temperature in other cooling cavities when it flows back to the reflux cavity.

[0015] In a specific possible implementation scheme, the connecting pipe passes through the downstream layered plate and is inserted into the reflux chamber. The outer tube is provided with a reflux flow hole connected to the downstream cooling chamber. The reflux flow hole is connected to the insulation chamber, and the insulation chamber is connected to the reflux chamber.

[0016] By adopting the above technical solution, the coolant in the cooling cavity downstream of the connecting pipe flows into the heat exchange cavity through the reflux flow hole, and then the coolant exchanges heat with the coolant in the inner tube and flows into the reflux cavity along the heat insulation cavity, so that the coolant in the cooling cavity after heat exchange with the coolant in the inner tube quickly flows back to the reflux cavity, reducing the temperature increase caused by the coolant in the inner tube and the coolant in the downstream cooling cavity, so that the coolant in the cooling cavity can fully cool the heat-generating module.

[0017] In a specific possible implementation scheme, the heat exchange plate is provided with a plurality of heat-conducting rods, each of the heat-conducting rods passes from the side of the heat exchange plate away from the heating module to the side close to the heating module, the heat-conducting rod is slidingly and sealingly connected to the heat exchange plate, and the heat exchange plate is provided with a plurality of telescopic springs, which correspond one-to-one to the heat-conducting rods and are used to push the heat-conducting rods to abut against the heating module.

[0018] By adopting the above technical solution, when the heat exchange plate is installed on the heating module, since the contact surface between the heating module and the heat exchange plate may be uneven, the telescopic spring pushes the heat-conducting rod to abut against the uneven position, and then the heat is guided into the heat exchange cavity through the heat-conducting rod to exchange heat with the coolant, thereby effectively avoiding heat accumulation caused by the uneven contact surface of the heating module and improving the heat dissipation effect of the heating module.

[0019] In a specific possible implementation scheme, each of the heat-conducting rods is sealed and fixedly connected to the heat exchange plate through the two bellows, and the two bellows are both sleeved on the heat-conducting rod. One end of one of the bellows is sealed and fixed to the heat-conducting rod, and the other end is sealed and fixed to the heat exchange surface. One end of the other bellows is sealed and fixed to the heat-conducting rod, and the other end is sealed and fixed to the side of the heat exchange plate away from the heating module.

[0020] By adopting the above technical solution, the heat conducting rod is connected to the heat exchange plate through the bellows, which can improve the sealing between the heat conducting rod and the heat exchange cavity while ensuring the sliding of the heat conducting rod.

[0021] In a specific possible implementation scheme, the connecting unit includes a connecting pipe, a mounting part and several branch pipes. The connecting pipe is connected to the circulation pipeline. Several branch pipes are fixed on the connecting pipe along the axial direction of the connecting pipe and are connected to the connecting pipe. The side wall of the heat exchange plate is provided with liquid inlet holes evenly arranged along the direction perpendicular to the flow of the coolant. The liquid inlet holes correspond to the branch pipes one by one. The branch pipes can be inserted into the liquid inlet holes. The branch pipes are provided with sealing gaskets. The mounting part is used to press the sealing gaskets onto the heat exchange plate so that the sealing gaskets seal the branch pipes and the liquid inlet holes.

[0022] By adopting the above technical solution, the connecting pipe drives the branch pipe to be inserted into the liquid inlet through-hole, and then the connecting pipe is installed between the heat exchange plate through the mounting piece, and the sealing gasket is pressed against the mounting plate to seal the connection between the branch pipe and the liquid inlet through-hole, thereby improving the sealing performance of the connection between the branch pipe and the heat exchange plate; by setting up a plurality of branch pipes, the coolant can flow into the heat exchange cavity more evenly.

[0023] In a specific possible implementation scheme, the mounting member includes a first ear plate, a second ear plate and a fixing bolt, the first ear plate is fixedly arranged on the heat exchange plate, the second ear plate is fixedly arranged on the connecting pipe, and the fixing bolt passes through the first ear plate and the second ear plate and is fixed.

[0024] By adopting the above technical solution, when installing the connecting pipe and the heat exchange plate, the first ear plate and the second ear plate are fixed by fixing bolts to complete the installation of the connecting pipe and the heat exchange plate, thereby improving the convenience of installing the connecting pipe and the heat exchange plate.

[0025] On the other hand, the present application also provides a cooling control method for a liquid cooling structure of a high-power DC charging pile for electric vehicles, using the above-mentioned liquid cooling structure of a high-power DC charging pile for electric vehicles, and further comprising the following steps:

[0026] S1, the circulating power unit transports the coolant in the cooling and heat exchange unit to the heat exchange cavity through the connecting unit;

[0027] S2, after the coolant passes through the stratification unit and is stratified, it flows to the corresponding heat exchange area and exchanges heat with the heating module through the heat exchange plate;

[0028] S3, the coolant after heat exchange with the heating module is guided to the outlet of the heat exchange cavity through the guiding unit, and circulated to the cooling heat exchange unit through the circulation pipeline for cooling;

[0029] S4. Repeat steps S1-S3.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. When cooling the charging pile, the circulating power unit transports the coolant in the cooling heat exchange unit to the heat exchange cavity through the connecting unit. After being stratified by the stratification unit, the coolant flows to the corresponding heat exchange area and exchanges heat between the heat exchange plate and the heating module. The coolant after heat exchange with the heating module is guided to the outlet of the heat exchange cavity by the guiding unit and circulated to the cooling heat exchange unit through the circulation pipeline for cooling. The above process is repeated to continuously cool the charging pile. By contacting the entire heat exchange plate with the heating module, the heat exchange area between the coolant and the heating module can be increased, thereby improving the heat dissipation efficiency of the heating module and improving the heat dissipation effect.

[0032] 2. The layering plate separates the coolant flowing into the heat exchange chamber into layers, and then guides the layered coolant to the corresponding heat exchange area for heat exchange with the heating module, making the heat exchange between the coolant and the heating module more thorough and improving the heat dissipation effect of the heating module;

[0033] 3. The telescopic spring pushes the heat-conducting rod to contact an uneven position, and then guides the heat into the heat exchange cavity through the heat-conducting rod to exchange heat with the coolant, thereby effectively avoiding heat accumulation caused by the uneven contact surface of the heating module and improving the heat dissipation effect of the heating module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of a liquid cooling structure of a high-power DC charging pile for electric vehicles according to an embodiment of the present application.

[0035] Figure 2 It is a structural diagram used to show the connection between the heat exchange plate and the heating module.

[0036] Figure 3 It is along Figure 2 Sectional view along line AA.

[0037] Figure 4 yes Figure 3 Enlarged view of part B in the middle.

[0038] Figure 5 yes Figure 3 Enlarged view of part C in the middle.

[0039] Figure 6 It is along Figure 2 Cross-sectional view along the DD line.

[0040] Explanation of the accompanying symbols: 1. Circulation power unit; 11. Compression pump; 12. Filter; 2. Cooling and heat exchange unit; 3. Circulation pipeline; 4. Heat exchange plate; 41. Heat exchange chamber; 411. Reflux chamber; 412. Cooling chamber; 42. Heat exchange surface; 43. Heat exchange area; 5. Heating module; 6. Connecting unit; 61. Connecting pipe; 62. Mounting part; 621. First ear plate; 622. Second ear plate; 623. Fixing bolt; 624. Fixing nut; 63. Branch pipe; 64. Liquid inlet hole; 65. Sealing groove; 66. Sealing ring; 67. Sealing gasket; 7. Layered unit; 71. Layered plate; 8. Guide unit; 81. Guide pipe; 82. Connecting pipe; 821. Inner pipe; 822. Outer pipe; 823. Insulation chamber; 824. Reflux hole; 91. Heat-conducting rod; 92. Spring seat; 93. Telescopic spring; 94. Bellows. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-6 This application is described in further detail.

[0042] On the one hand, an embodiment of the present application discloses a liquid cooling structure for a high-power DC charging pile for electric vehicles.

[0043] Reference Figure 1 、 Figure 2 A liquid cooling structure for a high-power DC charging pile for electric vehicles includes a circulating power unit 1, a cooling and heat exchange unit 2, a circulating pipeline 3, and a heat exchange plate 4. The heat exchange plate 4 is laid on a heating module 5 and is installed on the heating module 5 by providing mounting components such as ear plates and bolts. The heat exchange plate 4 is in surface contact with the heating module 5. The cooling and heat exchange unit 2 contains coolant. The cooling and heat exchange unit 2 in this embodiment is selected from lakes located in residential areas, city parks, etc. The corresponding coolant is cooling water. The coolant is cooled by natural cooling, which can reduce the energy consumption of cooling the coolant and is more energy-efficient. In other embodiments, the cooling and heat exchange unit 2 can also be a cooling tank or an air-cooled fan, which uses air cooling to cool the coolant.

[0044] Reference Figure 1 The circulation power unit 1 in this embodiment includes two compression pumps 11. The two compression pumps 11 are connected in parallel on the circulation pipeline 3, one is in use and the other is used as a backup. Since cooling water is used as the coolant, a filter 12 needs to be set on the circulation pipeline 3 on the suction side of the compression pump 11 to filter impurities in the cooling water to prevent impurities from clogging the liquid cooling structure.

[0045] Reference Figure 2 、 Figure 3A heat exchange cavity 41 is provided in the heat exchange plate 4, and the circulation pipeline 3 is connected to the heat exchange cavity 41 through the connecting unit 6. The compression pump 11 passes the coolant into the heat exchange cavity 41 through the connecting unit 6 through the circulation pipeline 3. The coolant entering the heat exchange cavity 41 exchanges heat with the heating module 5 through the heat exchange plate 4, and then flows back to the lake through the circulation pipeline 3.

[0046] Reference Figure 2 、 Figure 3 The side of the heat exchange chamber 41 close to the heating module 5 is set as a heat exchange surface 42. The heat exchange surface 42 is divided into N (N is an integer greater than 1) heat exchange zones 43 along the flow direction of the coolant in the heat exchange chamber 41. In this embodiment, N=3 is taken as an example. The heat exchange plate 4 is provided with three stratification units 7 in the heat exchange chamber 41. The three stratification units 7 divide the coolant flowing into the heat exchange chamber 41 into three layers and guide them to the heat exchange surface 42 for heat exchange. The coolant after heat exchange in each layer is guided to the outlet of the heat exchange chamber 41 through the guide unit 8 respectively.

[0047] When cooling the charging pile, the compression pump 11 draws the cooling water in the lake through the circulation pipe 3, and transports it to the heat exchange chamber 41 through the circulation pipe 3 and the connecting unit 6. After the coolant is stratified by the stratification unit 7, it flows to the corresponding heat exchange area 43, and performs heat exchange between the heat exchange plate 4 and the heating module 5. The coolant after heat exchange with the heating module 5 is guided to the outlet of the heat exchange chamber 41 through the guide unit 8, and circulates to the cooling heat exchange unit 2 through the circulation pipe 3 for cooling. The compression pump 11 drives the coolant to circulate the above process, which can continuously cool the charging pile. By contacting the entire heat exchange plate 4 with the heating module 5, the heat exchange area between the coolant and the heating module 5 can be increased, thereby improving the heat dissipation efficiency of the heating module 5 and improving the heat dissipation effect.

[0048] Reference Figure 2 In this embodiment, the connecting unit 6 includes a connecting pipe 61, a mounting part 62 and several branch pipes 63. The connecting pipe 61 is fixed to and connected with the circulation pipeline 3. The several branch pipes 63 are fixed on the connecting pipe 61 along the axial direction of the connecting pipe 61 and are connected with the connecting pipe 61. The connecting pipe 61 is arranged on one side of the heat exchange plate 4.

[0049] Reference Figure 3 、 Figure 4 The heat exchange plate 4 is provided with liquid inlet holes 64 evenly arranged along the direction perpendicular to the flow of the coolant on the side wall opposite to the connecting pipe 61. The liquid inlet holes 64 correspond to the branch pipes 63 one by one. The diameter of the liquid inlet holes 64 is the same as the outer diameter of the branch pipes 63, and the branch pipes 63 can be inserted into the liquid inlet holes 64.

[0050] Reference Figure 3 、 Figure 4The heat exchange plate 4 has a plurality of sealing grooves 65 formed on the side wall opposite the connecting pipe 61. The sealing grooves 65 correspond one-to-one with the liquid inlet holes 64 and are coaxially arranged at the end of the liquid inlet hole 64 near the connecting pipe 61. A sealing ring 66 is fixed to the branch pipe 63, opposite the sealing groove 65. A sealing gasket 67 is fixed to the side of the sealing ring 66 facing the sealing groove 65. The sealing gasket 67 is sleeved on the branch pipe 63. The mounting member 62 is used to mount the connecting pipe 61 on the heat exchange plate 4 and press the sealing gasket 67 against the heat exchange plate 4, so that the sealing gasket 67 blocks the gap between the branch pipe 63 and the liquid inlet hole 64.

[0051] Reference Figure 2 There are two groups of mounting parts 62, which are respectively arranged on the upper and lower sides of the heat exchange plate 4 and the connecting pipe 61. The mounting parts 62 in this embodiment include a first ear plate 621, a second ear plate 622 and a fixing bolt 623. The first ear plate 621 is fixedly set on the heat exchange plate 4, and the second ear plate 622 is fixedly set on the connecting pipe 61. The fixing bolt 623 passes through the first ear plate 621 and the second ear plate 622 and is fixed by a fixing nut 624.

[0052] When installing the connecting pipe 61, first insert the connecting pipe 61 and the branch pipe 63 into the liquid inlet hole 64, then sequentially pass the fixing bolts 623 through the first ear plate 621 and the second ear plate 622, and then tighten the fixing bolts 623 to fix the first ear plate 621 and the second ear plate 622. The sealing gasket 67 is pressed tightly against the sealing groove 65. The deformation of the sealing gasket 67 in the sealing groove 65 seals the connection between the branch pipe 63 and the liquid inlet hole 64, thereby improving the sealing between the branch pipe 63 and the heat exchange plate 4. By providing multiple branch pipes 63, the coolant can flow more evenly into the heat exchange cavity 41.

[0053] Reference Figure 3 The layered unit 7 in this embodiment includes a layered plate 71. The layered plate 71 in this embodiment can be a heat-insulating plate. One end of each of the three layered plates 71 is located at the entrance of the heat exchange chamber 41, thereby dividing the entrance of the heat exchange chamber 41 into three areas. The other ends are sealed and fixedly connected to the heat exchange surface 42, and the heat exchange surface 42 is divided into a plurality of heat exchange zones 43. The three layered plates 71 divide the entire heat exchange chamber 41 into a reflux chamber 411 connected to the outlet of the heat exchange chamber 41 and three cooling chambers 412 connected to the inlet of the heat exchange chamber 41. The coolant entering the heat exchange chamber 41 is divided into three layers by the three layered plates 71, and then respectively guided to the corresponding heat exchange zones 43 for heat exchange. By setting the layered plates 71 as heat-insulating plates, the heat exchange between the cooling chambers 412 can be reduced, so that the coolant in each cooling chamber 412 can better cool the heating module 5.

[0054] Reference Figure 3The guide unit 8 in this embodiment includes a guide pipe 81 and a connecting pipe 82. The guide pipe 81 is arranged on the layer plate 71 adjacent to the reflux chamber 411 and is connected to the cooling chamber 412 corresponding to the layer plate 71. The remaining layer plates 71 are connected to the reflux chamber 411 through the connecting pipe 82. The connecting pipes 82 all pass through the layer plate 71 located downstream of the corresponding layer plate 71 and extend into the reflux chamber 411. The connecting pipe 82 and the guide pipe 81 are both arranged at the end where the coolant flows in the cooling chamber 412.

[0055] Reference Figure 3 、 Figure 5 The connecting tube 82 in this embodiment includes an inner tube 821 and an outer tube 822. The inner tube 821 and the outer tube 822 are coaxial and fixed. A heat-insulating cavity 823 is provided between the inner tube 821 and the outer tube 822. One end of the heat-insulating cavity 823 is isolated from the cooling cavity 412 corresponding to the connecting tube 82, and the other end is connected to the reflux cavity 411. The outer tube 822 is provided with a plurality of reflux holes 824 that communicate with the downstream cooling cavity 412. The reflux holes 824 are connected to the heat-insulating cavity 823.

[0056] When the coolant enters the heat exchange chamber 41, the top layer of coolant in contact with the heat exchange surface 42 exchanges heat with the heating module 5 and the temperature rises. Since the overall temperature of the cooling water is higher than 4°C, the density of the coolant after heat exchange is lower than the coolant in the bottom layer that has not exchanged heat. As a result, the coolant cannot completely exchange heat with the heating module 5. Therefore, a layered plate 71 is provided to divide the coolant flowing into the heat exchange chamber 41 into three layers, and then the layered coolant is guided to the corresponding heat exchange area 43 to exchange heat with the heating module 5, so that the heat exchange between the coolant and the heating module 5 is more thorough, thereby improving the heat dissipation effect of the heating module 5.

[0057] After the heat exchange, the coolant in each cooling chamber 412 flows into the reflux chamber 411 through the connecting pipe 82 and the guide pipe 81, and the coolant in the cooling chamber 412 downstream of the connecting pipe 82 flows into the heat exchange chamber 41 through the reflux flow hole 824. Then, after the coolant exchanges heat with the coolant in the inner tube 821, it flows into the reflux chamber 411 along the insulation chamber 823, so that the coolant in the cooling chamber 412 quickly flows back to the reflux chamber 411 after the heat exchange with the coolant in the inner tube 821, thereby reducing the temperature increase caused by the contact between the coolant in the inner tube 821 and the coolant in the downstream cooling chamber 412, so that the coolant in the cooling chamber 412 can fully cool down the heating module 5.

[0058] Reference Figure 2 、 Figure 6Since the heat exchange plate 4 and the heating module 5 adopt a surface-to-surface contact heat exchange method, heat accumulation will occur due to the unevenness of the contact surface between the heating module 5 and the heat exchange plate 4, resulting in a local temperature increase of the heating module 5. In order to solve this problem, a plurality of heat-conducting rods 91 are provided on the heat exchange plate 4. Each heat-conducting rod 91 passes from the side of the heat exchange plate 4 away from the heating module 5 to the side close to the heating module 5. The heat-conducting rod 91 is slidingly and sealingly connected to the heat exchange plate 4. The heat exchange plate 4 is fixedly provided with a plurality of spring seats 92 on the side away from the heating module 5. Each spring seat 92 is fixedly provided with a telescopic spring 93. The telescopic spring 93 is located between the spring seat 92 and the heat-conducting rod 91. One end of the telescopic spring 93 is fixedly connected to the spring seat 92, and the other end is fixedly connected to the heat-conducting rod 91. Initially, the telescopic spring 93 applies an elastic force to the heat-conducting rod 91 toward the heating module 5.

[0059] Reference Figure 2 、 Figure 6 Each heat-conducting rod 91 is sealed and fixedly connected to the heat exchange plate 4 through two bellows 94. The bellows 94 have a certain degree of elasticity. Both bellows 94 are sleeved on the heat-conducting rod 91. One bellows 94 is located on the side of the heat exchange chamber 41 close to the heating module 5, and one end of the bellows 94 is sealed and fixed to the heat-conducting rod 91. The other end is sealed and fixed to the heat exchange surface 42. The other bellows 94 is located on the side of the heat exchange plate 4 away from the heating module 5, and one end of the bellows 94 is sealed and fixed to the heat-conducting rod 91, and the other end is sealed and fixed to the heat exchange plate 4. The heat-conducting rod 91 is connected to the heat exchange plate 4 through the bellows 94, which can improve the sealing between the heat-conducting rod 91 and the heat exchange chamber 41 while ensuring the sliding of the heat-conducting rod 91.

[0060] When the heat exchange plate 4 is installed on the heating module 5, since the contact surface between the heating module 5 and the heat exchange plate 4 may be uneven, the telescopic spring 93 pushes the heat conducting rod 91 to abut against the uneven position, and then the heat is guided into the heat exchange cavity 41 through the heat conducting rod 91 to exchange heat with the coolant, thereby effectively avoiding heat accumulation caused by the uneven contact surface of the heating module 5 and improving the heat dissipation effect of the heating module 5.

[0061] The implementation principle of the liquid cooling structure of a high-power DC charging pile for electric vehicles in the embodiment of the present application is as follows: when cooling the charging pile, the compression pump 11 draws the cooling water in the lake through the circulation pipe, and transports it to the heat exchange chamber 41 through the circulation pipe 3, the connecting pipe 61, and the branch pipe 63. After the coolant is layered through the stratification plate 71, it flows to the corresponding heat exchange area 43, and performs heat exchange between the heat exchange plate 4 and the heating module 5. The coolant after heat exchange with the heating module 5 is guided to the reflux chamber 411 through the guide pipe 81 and the connecting pipe 82, and circulated to the lake through the circulation pipe 3 for cooling. The compression pump 11 drives the coolant to circulate the above process, which can continuously cool the charging pile. By contacting the entire heat exchange plate 4 with the heating module 5, the heat exchange area between the coolant and the heating module 5 can be increased, thereby improving the heat dissipation efficiency of the heating module 5 and improving the heat dissipation effect.

[0062] On the other hand, an embodiment of the present application discloses a cooling control method for a liquid cooling structure of a high-power DC charging pile for electric vehicles.

[0063] A cooling control method for a liquid cooling structure of a high-power DC charging pile for electric vehicles, using the above-mentioned liquid cooling structure of a high-power DC charging pile for electric vehicles, further comprising the following steps:

[0064] S1, the compression pump 11 transports the cooling water in the lake to the heat exchange chamber 41 through the circulation pipe 3 and the connecting pipe 61 and the branch pipe 63. The circulation pipe 3 is inserted into the lake, and a filter 12 is set at the insertion port to prevent impurities in the cooling water from clogging the pipe.

[0065] S2. After being stratified by the stratification plate 71, the cooling water flows to the corresponding heat exchange area 43 through the corresponding cooling cavity 412, and performs heat exchange between the heat exchange plate 4 and the heating module 5.

[0066] S3, the cooling water after heat exchange with the heating module 5 is guided to the outlet of the heat exchange chamber 41 through the corresponding connecting pipe 82 or the guide pipe 81, and circulated to the lake through the circulation pipe 3 for cooling;

[0067] S4. Repeat steps S1-S3.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A liquid cooling structure for a high-power DC charging station for electric vehicles, characterized by: The invention comprises a circulating power unit (1), a cooling heat exchange unit (2), a circulating pipeline (3), and a heat exchange plate (4). The heat exchange plate (4) is laid on a heating module (5). A heat exchange cavity (41) is provided in the heat exchange plate (4). The circulating pipeline (3) is connected to the heat exchange cavity (41) through a connecting unit (6). The cooling heat exchange unit (2) stores a coolant and is capable of cooling the coolant. The circulating power unit (1) is capable of transporting the coolant to the heat exchange cavity (41) through the circulating pipeline (3). The coolant entering the heat exchange cavity (41) exchanges heat with the heating module (5) through the heat exchange plate (4) and flows back to the cooling heat exchange unit (2) through the circulating pipeline (3). The side of the heat exchange chamber (41) close to the heating module (5) is set as a heat exchange surface (42), and the heat exchange surface (42) is divided into N heat exchange areas (43) along the direction of the coolant flow in the heat exchange chamber (41), where N is an integer greater than 1. The heat exchange plate (4) is provided with N layering units (7) in the heat exchange chamber (41), and the layering units (7) are used to layer the coolant flowing into the heat exchange chamber (41) and guide it to the heat exchange surface (42) for heat exchange. The coolant after heat exchange is guided to the outlet of the heat exchange chamber (41) through the guiding units (8). The stratified unit (7) includes a stratified plate (71), one end of each of the N stratified plates (71) is located at the entrance of the heat exchange chamber (41), and the other end is fixedly connected to the heat exchange surface (42), and divides the heat exchange surface (42) into a plurality of heat exchange zones (43); The guide unit (8) comprises a guide pipe (81) and a connecting pipe (82); N layered plates (71) divide the heat exchange chamber (41) into a reflux chamber (411) connected to the outlet of the heat exchange chamber (41) and N cooling chambers (412) connected to the inlet of the heat exchange chamber (41); the layered plates (71) adjacent to the reflux chamber (411) are connected to the reflux chamber (411) via the guide pipe (81); and the remaining layered plates (71) are connected to the reflux chamber (411) via the connecting pipe (82).

2. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 1 is characterized in that: The connecting pipe (82) comprises an inner pipe (821) and an outer pipe (822), and a heat-insulating cavity (823) is provided between the inner pipe (821) and the outer pipe (822).

3. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 2 is characterized in that: The connecting pipe (82) passes through the downstream layered plate (71) and is inserted into the reflux chamber (411). The outer pipe (822) is provided with a reflux flow hole (824) communicating with the downstream cooling chamber (412). The reflux flow hole (824) is connected to the heat insulation chamber (823), and the heat insulation chamber (823) is connected to the reflux chamber (411).

4. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 1 is characterized in that: The heat exchange plate (4) is provided with a plurality of heat-conducting rods (91), each of the heat-conducting rods (91) passes from the side of the heat exchange plate (4) away from the heating module (5) to the side close to the heating module (5), the heat-conducting rods (91) are connected to the heat exchange plate (4) in a sliding and sealing manner, and the heat exchange plate (4) is provided with a plurality of telescopic springs (93), the telescopic springs (93) correspond to the heat-conducting rods (91) one by one, and are used to push the heat-conducting rods (91) to abut against the heating module (5).

5. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 4 is characterized in that: Each of the heat-conducting rods (91) is sealed and fixedly connected to the heat exchange plate (4) through two bellows (94). The two bellows (94) are both sleeved on the heat-conducting rod (91). One end of one of the bellows (94) is sealed and fixedly connected to the heat-conducting rod (91), and the other end is sealed and fixedly connected to the heat exchange surface (42). One end of the other bellows (94) is sealed and fixedly connected to the heat-conducting rod (91), and the other end is sealed and fixedly connected to the side of the heat exchange plate (4) facing away from the heating module (5).

6. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 1, characterized in that: The connecting unit (6) includes a connecting pipe (61), a mounting member (62) and a plurality of branch pipes (63). The connecting pipe (61) is connected to the circulation pipeline (3). The plurality of branch pipes (63) are fixedly arranged on the connecting pipe (61) along the axial direction of the connecting pipe (61) and are connected to the connecting pipe (61). The side wall of the heat exchange plate (4) is provided with liquid inlet holes (64) uniformly arranged along a direction perpendicular to the flow of the coolant. The liquid inlet holes (64) correspond to the branch pipes (63) one by one. The branch pipes (63) can be inserted into the liquid inlet holes (64). A sealing gasket (67) is sleeved on the branch pipe (63). The mounting member (62) is used to press the sealing gasket (67) onto the heat exchange plate (4) so ​​that the sealing gasket (67) blocks the branch pipe (63) and the liquid inlet hole (64).

7. The liquid cooling structure of the electric vehicle high-power DC charging pile according to claim 6 is characterized in that: The mounting member (62) comprises a first ear plate (621), a second ear plate (622) and a fixing bolt (623), wherein the first ear plate (621) is fixedly arranged on the heat exchange plate (4), and the second ear plate (622) is fixedly arranged on the connecting pipe (61), and the fixing bolt (623) passes through the first ear plate (621) and the second ear plate (622) and is fixed.

8. A cooling control method for a liquid cooling structure of a high-power DC charging pile for electric vehicles, using the liquid cooling structure of a high-power DC charging pile for electric vehicles according to any one of claims 1 to 7, characterized in that: The following steps are also included: S1, the circulating power unit (1) transports the coolant in the cooling heat exchange unit (2) to the heat exchange cavity (41) through the connecting unit (6); S2, after the coolant is stratified by the stratification unit (7), it flows to the corresponding heat exchange area (43) and exchanges heat with the heating module (5) through the heat exchange plate (4); S3, the coolant after heat exchange with the heating module (5) is guided to the outlet of the heat exchange chamber (41) through the guiding unit (8), and circulated to the cooling heat exchange unit (2) through the circulation pipeline (3) for cooling; S4. Repeat steps S1-S3.

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