Phase change material composite heat dissipation corrugated pipe for new energy vehicle thermal management system

Abstract

The application relates to a new energy automobile thermal management system phase change material composite heat dissipation corrugated pipe, which comprises an outer pipe and an inner pipe, the inner pipe is formed by interlaced weaving of copper wires and carbon fiber wires, both ends of the inner pipe are closed, and the inner pipe is filled with a phase change material. When the phase change material changes in volume during a phase change process, the carbon fiber wires can accommodate the volume growth of the inner pipe content through self-micro-tension, the copper wires serve as a framework to ensure that the basic form of the inner pipe is stable, and can also be slightly bent and adjusted along with the deformation of the carbon fiber wires, the copper wires and the carbon fiber wires are woven into a net, the stress of the volume change of the phase change material can be dispersed to the whole inner pipe, the situation that the inner pipe is cracked due to local stress concentration is reduced, and the closed design of both ends of the inner pipe and the compactness of the woven structure can adapt to the volume change while reducing the leakage of the phase change material.

Description

Technical Field

[0001] This application relates to the field of corrugated pipes, and in particular to a phase change material composite heat dissipation corrugated pipe for a thermal management system of new energy vehicles. Background Technology

[0002] With the global energy and environmental issues becoming increasingly severe, new energy vehicles have become the main direction for the transformation and upgrading of the world's automotive industry and a strategic choice for promoting sustainable development. The performance, safety and lifespan of its core components—power batteries, drive motors and electronic control systems (collectively known as the "three-electric system")—directly determine the overall performance of the vehicle.

[0003] Among them, the operating temperature of the power battery has a decisive impact on vehicle performance. The battery will continuously generate heat during charging and discharging. If the heat cannot be dissipated in time, the battery pack temperature will rise sharply, which will lead to the risk of thermal runaway and seriously threaten vehicle safety. Therefore, an efficient and reliable thermal management system is the key to ensuring the safety and range of new energy vehicles.

[0004] Traditional thermal management solutions utilize "metal pipes + coolant circulation" or "finned air cooling" for heat dissipation, but the heat dissipation response is lagging (the heat dissipation efficiency of the thermal management system cannot keep up with the heat generation rate of the heat source), making it difficult to cope with the instantaneous high heat flow impact of the "three-electric system" and prone to local overheating problems.

[0005] To address the shortcomings of traditional solutions, phase change materials (PCMs) have become a research hotspot in the field of thermal management due to their advantages of large latent heat of phase change and high temperature control accuracy. Combining PCMs with heat dissipation structures can absorb a large amount of heat through the phase change process of the material, achieving a synergy of "passive heat storage and active heat dissipation" and reducing system energy consumption. However, PCMs undergo a 5%-15% volume change during the phase change process, which can easily lead to cracking of the encapsulation structure and material leakage, affecting long-term stability and requiring further improvement. Summary of the Invention

[0006] To address the issue of volume changes during the phase change process of phase change materials, which can easily lead to cracking of the encapsulation structure and material leakage, this application provides a phase change material composite heat dissipation corrugated pipe for a thermal management system of new energy vehicles.

[0007] This application provides a phase change material composite heat dissipation corrugated pipe for a thermal management system of new energy vehicles, which adopts the following technical solution:

[0008] A phase change material composite heat dissipation corrugated pipe for thermal management system of new energy vehicle includes an outer pipe and an inner pipe. The inner pipe is made of copper wire and carbon fiber wire interlaced and woven together. The two ends of the inner pipe are closed and the inner pipe is filled with phase change material.

[0009] By adopting the above technical solution, carbon fiber filaments have good tensile properties and elastic recovery. When the phase change material undergoes volume change during the phase change process, the carbon fiber filaments can accommodate the volume increase of the inner tube contents through their own micro-stretching. Copper wire has both rigidity and a certain degree of ductility, serving as a skeleton to ensure the stability of the basic shape of the inner tube. It can also be slightly bent and adjusted according to the deformation of the carbon fiber filaments. By weaving copper wire and carbon fiber filaments into a mesh, the stress of the phase change material volume change can be dispersed throughout the inner tube, reducing the possibility of cracking of the inner tube due to local stress concentration. The closed design at both ends of the inner tube, together with the density of the braided structure, can reduce the leakage of the phase change material while adapting to volume changes.

[0010] Optionally, the inner tube includes an outer layer and an inner layer, both of which are woven from interlaced copper wires and carbon fiber filaments. The diameter of the copper wires is 0.25 mm, and the diameter of the bundle of carbon fiber filaments is 0.2 mm. The weaving spacing between the copper wires and carbon fiber filaments in the outer layer is 0.8 mm, and the volume ratio of the copper wires is 60%. The weaving spacing between the copper wires and carbon fiber filaments in the inner layer is 1.5 mm, and the volume ratio of the carbon fiber filaments is 70%.

[0011] By adopting the above technical solution, copper wire has good thermal conductivity, and the high volume ratio of copper wire in the outer layer forms a dense heat-conducting network in the outer layer. Heat can quickly reach the inner layer through the copper wire, reducing thermal resistance. The braiding spacing of the inner layer is larger than that of the outer layer, which can reduce the obstruction to heat diffusion of the phase change material, allowing heat to flow quickly to the outer layer and comprehensively improving heat transfer efficiency. Carbon fiber wire can also adapt to the expansion and contraction of the phase change material, so that the inner layer absorbs expansion stress and the outer layer maintains structural stability, thereby improving the overall structural stability of the inner tube.

[0012] Optionally, the inner tube has caps at both ends. Each cap includes a copper wire frame, a cover body, and a clamp. The copper wire frame includes a copper wire ring on the inner tube and several extended copper wires on the copper wire ring. The copper wire ring connects the inner layer and the outer layer. The several extended copper wires are located on the side of the copper wire ring away from the inner tube and are circumferentially distributed. The cover body has insertion holes for the extended copper wires to pass through. The outer side wall of the cover body has an annular groove located between the two ends of the insertion hole. The annular groove communicates with the insertion hole and allows the clamp to engage.

[0013] By adopting the above technical solution, when it is necessary to seal the inner tube, the extension copper wire is passed through the insertion hole, and then the clamp is inserted into the annular groove. The clamp squeezes the extension copper wire located in the annular groove, causing the extension copper wire to bend and deform against the inner wall of the annular groove. The clamp also uses the extension copper wire to abut against the inner wall of the annular groove to shape the extension copper wire. By the bent part of the extension copper wire abutting against the inner wall of the annular groove, the positioning between the cover and the copper wire frame can be achieved. The sealing of both ends of the inner tube is achieved by sealing the cover. The operation is simple.

[0014] Optionally, the cover is provided with a plurality of extension rods spaced circumferentially, the extension rods being located on the side of the annular groove near the copper wire ring, and the two end faces of the outer tube are provided with slots for the extension rods to be inserted.

[0015] By adopting the above technical solution, the inner tube is positioned by the extension rods on the caps at both ends of the inner tube abutting against the inner wall of the slot, thereby forming a stable channel for the flow of cooling medium between the outer tube and the inner tube, reducing the situation where the inner tube collides with the inner wall of the outer tube under the flow and scouring of the cooling medium in the outer tube.

[0016] Optionally, the carbon fiber filament is nickel-plated, and the copper wire is electroplated with a nano-tin layer.

[0017] By adopting the above technical solution, a conductive and thermally conductive metal layer is formed on the surface of carbon fiber, reducing the contact resistance between copper and carbon. The tin layer has excellent ductility and can fill the tiny gaps between copper wires and carbon fiber filaments during weaving deformation, making the heat conduction channel more continuous, further reducing the interfacial thermal resistance, and improving the overall thermal conductivity of the inner tube.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. When the phase change material undergoes volume change during the phase change process, the carbon fiber filaments can accommodate the volume increase of the contents of the inner tube through their own micro-stretching. The copper wire, as a skeleton, ensures the stability of the basic shape of the inner tube and can also be slightly bent and adjusted according to the deformation of the carbon fiber filaments. By weaving the copper wire and carbon fiber filaments into a mesh, the stress of the phase change material volume change can be distributed to the entire inner tube, reducing the possibility of cracking of the inner tube due to local stress concentration. The closed design at both ends of the inner tube and the density of the braided structure work together to reduce the leakage of the phase change material while adapting to volume changes.

[0020] 2. The outer layer forms a dense heat-conducting network, allowing heat to quickly reach the inner layer through the copper wire, reducing thermal resistance. The braiding spacing of the inner layer is larger than that of the outer layer, which reduces the obstruction to heat diffusion of the phase change material, allowing heat to flow quickly to the outer layer and comprehensively improving heat transfer efficiency. The carbon fiber filaments can also adapt to the expansion and contraction of the phase change material, enabling the inner layer to absorb expansion stress while the outer layer maintains structural stability, thus improving the overall structural stability of the inner tube.

[0021] 3. When it is necessary to seal the inner tube, the extension copper wire is threaded through the insertion hole, and then the clamp is inserted into the annular groove. The clamp squeezes the extension copper wire located in the annular groove, causing the extension copper wire to bend and deform against the inner wall of the annular groove. The positioning between the cover and the copper wire frame can be achieved by the bent part of the extension copper wire abutting against the inner wall of the annular groove. The two ends of the inner tube are sealed by the cover. The operation is simple. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of this application.

[0023] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0024] Figure 3 for Figure 2 The enlarged view of section A mainly shows the structure of the inner tube and the cap.

[0025] Figure 4 This is a partial structural diagram of an embodiment of this application, mainly showing the structure of the annular groove.

[0026] Explanation of reference numerals in the attached drawings: 1. Outer tube; 11. Slot; 2. Inner tube; 21. Outer layer; 22. Inner layer; 3. Cover; 31. Copper wire frame; 311. Copper wire ring; 312. Extension copper wire; 32. Cover body; 321. Insertion hole; 322. Ring groove; 33. Clamp; 4. Extension rod. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0028] This application discloses a phase change material composite heat dissipation corrugated pipe for a thermal management system in new energy vehicles. See also... Figures 1-3 The phase change material composite heat dissipation corrugated pipe of the thermal management system for new energy vehicles includes an outer pipe 1 and an inner pipe 2. The inner pipe 2 is located inside the outer pipe 1. The inner pipe 2 includes an outer layer 21 and an inner layer 22. The outer layer 21 is sleeved on the outside of the inner layer 22 and is attached to the outer wall of the inner layer 22. Both the outer layer 21 and the inner layer 22 are woven by interlacing copper wire and carbon fiber wire. The diameter of the copper wire is 0.25 mm and the surface of the copper wire is electroplated with a nano-tin layer. The diameter of the bundle of carbon fiber wire is 0.2 mm and the surface of the carbon fiber wire is plated with nickel. The weaving spacing between the copper wire and the carbon fiber wire in the outer layer 21 is 0.8 mm and the volume ratio of the copper wire is 60%. The weaving spacing between the copper wire and the carbon fiber wire in the inner layer 22 is 1.5 mm and the volume ratio of the carbon fiber wire is 70%. In this embodiment, the weaving spacing refers to the center-to-center distance between two adjacent wires.

[0029] See Figures 1-4 The inner tube 2 is closed at both ends and filled with phase change material. The inner tube 2 is provided with caps 3 at both ends. The caps 3 include a copper wire frame 31, a cover body 32 and a clamp 33. The copper wire frame 31 includes a copper wire ring 311 and several extended copper wires 312. The copper wire ring 311 is fixed on the inner tube 2 and is fixedly connected to the inner layer 22 and the outer layer 21. Several extended copper wires 312 are fixed on the side of the copper wire ring 311 away from the inner tube 2 and are evenly distributed circumferentially along the outer periphery of the copper wire ring 311.

[0030] See Figures 1-4The cover 32 is located on the side of the copper wire ring 311 away from the inner tube 2. Several insertion holes 321 are provided on the end face of the cover 32 near the copper wire ring 311. The number and position of the insertion holes 321 correspond one-to-one with the number and position of the extension copper wires 312. The insertion holes 321 penetrate the cover 32 along the length of the inner tube 2. The insertion holes 321 are for the extension copper wires 312 to pass through. An annular groove 322 is provided on the outer wall of the cover 32. The annular groove 322 is arranged around the outer periphery of the cover 32. The annular groove 322 is located between the two ends of the insertion holes 321. The annular groove 322 and the several insertion holes 321 are all connected. The annular groove 322 is for the clamp 33 to be inserted.

[0031] See Figures 1-4 Several extension rods 4 are fixed on the cover 32. The extension rods 4 are located on the side of the annular groove 322 near the copper wire ring 311 and are evenly distributed around the outer periphery of the cover 32. Several slots 11 are provided on both end faces of the outer tube 1. The number and position of the slots 11 on the same side of the outer tube 1 correspond one-to-one with the number and position of the extension rods 4 on the cover 32. The slots 11 are used for the extension rods 4 to be inserted.

[0032] In practical use, the extension copper wire 312 is passed through the insertion hole 321, and then the clamp 33 is inserted into the annular groove 322. The clamp 33 squeezes the extension copper wire 312 located in the annular groove 322, causing the extension copper wire 312 to bend and deform against the inner wall of the annular groove 322. The clamp 33 then holds the extension copper wire 312 against the inner wall of the annular groove 322 to shape it. By having the bent part of the extension copper wire 312 abut against the inner wall of the annular groove 322, the positioning between the cover 32 and the copper wire frame 31 can be achieved. The cover 32 then seals both ends of the inner tube 2.

[0033] It should be noted that before inserting the insertion hole 321, the extension copper wire 312 is straight, and the length direction of the extension copper wire 312 is parallel to the length direction of the inner tube 2, so that when the inner tube 2 needs to be closed, the extension copper wire 312 can be inserted into the insertion hole 321. After the extension copper wire 312 is inserted into the insertion hole 321 and the clamp 33 is inserted into the annular groove 322, the clamp 33 squeezes the extension copper wire 312, causing the extension copper wire 312 to bend. The non-extension copper wire 312 is bent from the beginning. The extension copper wire 312 shown in the attached figure is the extension copper wire 312 after being bent and deformed by the clamp 33.

[0034] In practical use, when it is necessary to install the inner tube 2, one end of the inner tube 2 can be sealed by the cover 32 first, and then the inner tube 2 with one end sealed can be placed into the outer tube 1. The extension rod 4 is inserted into the slot 11 and the inner tube 2 is limited by the extension rod 4 abutting against the inner wall of the slot 11. Then, phase change material is filled into the inner tube 2. After filling, the other end of the inner tube 2 is sealed by another cover 32. At this time, the extension rod 4 on the cover 32 abuts against the inner wall of the slot 11 on the other side of the outer tube 1, thereby positioning the inner tube 2.

[0035] The implementation principle of the phase change material composite heat dissipation corrugated pipe for the thermal management system of a new energy vehicle in this application embodiment is as follows:

[0036] Carbon fiber filaments possess excellent tensile properties and elastic recovery. When the phase change material undergoes volume changes during the phase change process, the carbon fiber filaments can accommodate the volume increase of the contents of the inner tube 2 through their own micro-stretching. Copper wire, with both rigidity and a certain degree of ductility, serves as a skeleton to ensure the basic shape stability of the inner tube 2. It can also be slightly bent and adjusted according to the deformation of the carbon fiber filaments. By weaving copper and carbon fiber filaments into a mesh, the stress caused by the volume change of the phase change material can be dispersed throughout the inner tube 2, reducing the possibility of cracking of the inner tube 2 due to local stress concentration. The closed design at both ends of the inner tube 2, combined with the density of the braided structure, can reduce the leakage of the phase change material while adapting to volume changes.

[0037] The high volume ratio of copper wire in the outer layer 21 creates a dense heat-conducting network, allowing heat to quickly reach the inner layer 22 and reducing thermal resistance. The braiding spacing of the inner layer 22 is greater than that of the outer layer 21, which reduces the obstruction to heat diffusion of the phase change material and allows heat to flow quickly to the outer layer 21, thus improving the overall heat transfer efficiency. The carbon fiber filaments can also adapt to the expansion and contraction of the phase change material, enabling the inner layer 22 to absorb expansion stress while the outer layer 21 maintains structural stability, further improving the overall structural stability of the inner tube 2.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A new energy vehicle thermal management system phase change material composite heat dissipation corrugated pipe, characterized by: The application relates to a phase change material pipe, which comprises an outer pipe (1) and an inner pipe (2) located in the outer pipe (1), the inner pipe (2) is interlacedly woven by copper wires and carbon fiber wires, and the two ends of the inner pipe (2) are closed, and the inner pipe (2) is filled with a phase change material. The inner pipe (2) comprises an outer layer (21) and an inner layer (22), the outer layer (21) is sleeved outside the inner layer (22) and is attached to the outer wall of the inner layer (22), the outer layer (21) and the inner layer (22) are both interlacedly woven by copper wires and carbon fiber wires, the diameter of the copper wire is 0.25 mm, the bundle diameter of the carbon fiber wire is 0.2 mm, the interlaced spacing of the copper wire and the carbon fiber wire of the outer layer (21) is 0.8 mm, and the volume ratio of the copper wire is 60%, the interlaced spacing of the copper wire and the carbon fiber wire of the inner layer (22) is 1.5 mm, and the volume ratio of the carbon fiber wire is 70%. The two ends of the inner pipe (2) are provided with a cover (3), the cover (3) comprises a copper wire frame (31), a cover body (32) and a clamp (33), the copper wire frame (31) comprises a copper wire ring (311) arranged on the inner pipe (2) and a plurality of extension copper wires (312) arranged on the copper wire ring (311), the copper wire ring (311) is connected with the inner layer (22) and the outer layer (21), the plurality of extension copper wires (312) are located on the side of the copper wire ring (311) away from the inner pipe (2) and are distributed in a circumferential direction, the cover body (32) is provided with a plug hole (321) for the extension copper wire (312), a ring groove (322) is formed in the outer wall of the cover body (32), the ring groove (322) is located between the two ends of the plug hole (321), the ring groove (322) is communicated with the plug hole (321), and the ring groove (322) is used for clamping the clamp (33).

2. The phase change material composite heat dissipation corrugated pipe of the new energy vehicle thermal management system according to claim 1, characterized in that: A plurality of extension rods (4) are circumferentially arranged on the cover body (32), the extension rods (4) are located on the side of the ring groove (322) close to the copper wire ring (311), and the two end faces of the outer pipe (1) are provided with clamping grooves (11) for clamping the extension rods (4).

3. The phase change material composite heat dissipation corrugated pipe of the new energy vehicle thermal management system according to claim 1, characterized in that: The surface of the carbon fiber wire is plated with nickel, and the surface of the copper wire is electroplated with a nano-tin layer. The surface of the carbon fiber wire is plated with nickel, and the surface of the copper wire is electroplated with a nano-tin layer.

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