Drawer type heavy truck battery replacement battery pack cooling system

Abstract

The invention provides a drawer type heavy truck battery replacement battery pack cooling system which comprises a frame, a plurality of partition plates are arranged on the frame, a fluid pipeline is arranged in each partition plate, and the two ends of each fluid pipeline are located at one end of the corresponding partition plate; a plurality of interfaces are formed in the side wall of the partition plate and are respectively communicated with the fluid of the fluid pipeline; each supporting frame comprises an upper support, a lower support and an L-shaped connecting plate, mounting holes and cooling pipelines are arranged between the upper supports and the lower supports, the mounting holes and the cooling pipelines are arranged at intervals, the two ends of each cooling pipeline are connected with the connectors in the corresponding partition plate, one end of each L-shaped connecting plate is located between the corresponding upper support or the corresponding lower support, and the other end of each L-shaped connecting plate is connected with the corresponding cooling pipeline. The other end is located on one side of the upper support or the lower support. According to the application, the cooling pipeline which is arranged at an interval with the mounting hole is connected in the support frame, and the cooling medium exchanges heat with the external battery mounted in the support frame, so that heat generated by the external battery in the support frame can be quickly taken away.

Description

Technical Field

[0001] This application belongs to the technical field of heavy-duty truck battery pack cooling systems, specifically relating to a drawer-type heavy-duty truck battery pack cooling system that can effectively cool the heavy-duty truck battery pack. Background Technology

[0002] Traditional heavy-duty truck battery packs use either air cooling or water cooling. Air cooling typically uses fans or airflow generated by vehicle movement to remove heat from the battery, usually employing axial or centrifugal fans, with series / parallel air ducts designed according to the battery layout. However, due to its limited heat dissipation capacity, air cooling is generally limited to environments with moderate temperatures. Compared to air cooling, water cooling offers higher heat dissipation efficiency, but it is more complex, costly, and difficult to maintain. To improve economic efficiency, people are constantly improving the structure or process of water-cooling modes. For example, application number CN202220298797.8 discloses a water-cooled heavy-duty truck battery pack, which includes several power battery units stacked together, an integrated connector installed between two stacked power battery units, and a main water inlet pipe and a main water outlet pipe. The power battery unit includes a battery pack bottom shell, a battery pack top cover located on the top of the battery pack bottom shell, and several battery modules arranged in a matrix inside the battery pack bottom shell. A quick-connect connector for electrical conduction is provided at one end of the battery pack bottom shell, and multiple locking pins and a battery centering alignment module are respectively provided on the side of the battery pack bottom shell. A water flow channel is provided at the bottom of the battery pack bottom shell, which is connected to the main water inlet pipe and the main water outlet pipe to achieve water cooling. In practical applications, adding a water cooling structure is beneficial for heat dissipation, improves the safety and service life of the battery pack, and achieves better application results. However, this structure can only quickly remove heat from the bottom of the battery pack casing, but it cannot quickly and effectively remove the heat generated by the power battery inside the battery pack.

[0003] In view of this, this application provides a cooling system that can quickly dissipate heat from the power battery inside the battery pack of a drawer-type heavy truck. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a drawer-type heavy truck battery pack cooling system to solve the technical problems mentioned in the background art.

[0005] This invention provides a drawer-type heavy-duty truck battery pack cooling system, comprising: The frame is provided with a plurality of partitions for dividing the frame into a plurality of receiving cavities, wherein: each partition is provided with a fluid pipe inside, the two ends of the fluid pipe are located at one end of the partition and are used to connect to an external cooling medium; and the side wall of the partition is provided with a plurality of interfaces, the plurality of interfaces being respectively connected to the fluid pipe inside the partition; Multiple support frames are arranged side by side and movably connected in a receptacle. Each support frame includes an upper bracket, a lower bracket, and an L-shaped connecting plate. The upper and lower brackets are provided with multiple mounting holes for installing external batteries. Multiple cooling pipes are connected between the upper and lower brackets and spaced apart from the mounting holes. Both ends of each cooling pipe are connected to the interface on the partition plate. One end of the L-shaped connecting plate is located between the upper and lower brackets to fix the upper and lower brackets. The other end of the L-shaped connecting plate is located on one side of the upper or lower bracket and is used to connect the multiple external batteries installed in the mounting holes to external electrical components to form a conductive circuit.

[0006] In some embodiments, a controller is also included, which is connected to a temperature sensor disposed within a support frame. The temperature sensor is disposed on an upper or lower bracket for detecting the temperature of the battery within the corresponding support frame.

[0007] In some embodiments, the outer surface of each of the cooling pipes is fitted and connected to the outer surface of the corresponding external battery mounted in the support frame.

[0008] In some embodiments, each of the cooling pipes is provided with a shut-off valve, which is connected to a controller to adjust the flow rate of the cooling medium in the corresponding fluid pipe according to the controller's control instructions.

[0009] In some embodiments, multiple mounting holes are evenly arranged on the upper bracket and the lower bracket, and the external battery is fixed between the upper bracket and the lower bracket through the corresponding mounting holes.

[0010] In some embodiments, the L-shaped connecting plate has through holes that match the cooling pipes, and the end of each cooling pipe passes through the through hole and connects to the fluid pipe.

[0011] In some embodiments, multiple cooling pipes within each of the support frames are connected in series, in parallel, or in a series-parallel configuration.

[0012] In some embodiments, the frame and / or partition are provided with sliding grooves on opposite sides, and each upper or lower support and the end of the L-shaped connecting plate connected to the lower or upper support is provided with a slider that matches the sliding groove. Each support frame is connected to the receiving cavity in a pull-out manner by matching the slider with the sliding groove.

[0013] In some embodiments, the cooling conduit is made of an aluminum-based carbon nanotube composite material, which comprises, based on its total weight: 2-4% by weight of carbon nanotubes; and The aluminum alloy comprises, based on its total weight: 6-8% by weight Si; 0.4-0.6% by weight Mg; 0.1-0.15% by weight Fe; 0.01-0.05% by weight Cu; and the balance Al.

[0014] In some embodiments, the aspect ratio of the carbon nanotubes is in the range of 500:1 to 800:1.

[0015] The present invention has the following beneficial effects: This invention provides a drawer-type heavy-duty truck battery pack cooling system. By connecting and spaced multiple cooling pipes within a support frame and mounting holes, the system utilizes the low-temperature fluid within these pipes to exchange heat with the external batteries mounted within the support frame, rapidly removing the heat generated by both the batteries. Therefore, the drawer-type heavy-duty truck battery pack cooling system provided by this application can quickly and accurately exchange heat generated inside the heavy-duty truck battery pack. Simultaneously, the support frame effectively protects the heavy-duty truck batteries during transport, thereby significantly improving economic efficiency.

[0016] Furthermore, according to a preferred embodiment of the present invention, the cooling pipe is made of an aluminum-based carbon nanotube composite material. Carbon nanotubes have extremely high thermal conductivity (approximately 3000 W / m•K). Combining them with aluminum alloys improves the overall thermal conductivity of the cooling pipe, enabling faster heat dissipation from the battery. In addition, the addition of carbon nanotubes increases the tensile strength of the composite material while maintaining good plasticity, making it particularly suitable for applications requiring vibration and deformation resistance under frequent pulling and stretching conditions. Furthermore, the lower density of the aluminum-based composite material allows for weight reduction, contributing to the overall lightweighting of heavy-duty truck battery packs. On the other hand, this composite material exhibits excellent corrosion resistance in coolant environments (such as ethylene glycol aqueous solutions), extending its service life and avoiding the risk of coolant leakage due to corrosion. It is particularly important to emphasize that the aforementioned aluminum-based carbon nanotube composite material possesses better plasticity and surface adaptability, allowing for a closer fit to the battery surface, reducing thermal resistance, and improving heat exchange efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the support frame in some embodiments of this application. Figure 2 yes Figure 1 A structural diagram showing the structure without the L-shaped connecting plate. Figure 3 This is a schematic diagram of the frame structure with the top cover removed in some embodiments of this application. Figure 4 This is a schematic diagram of the series connection of cooling pipes in some embodiments of this application. Figure 5 This is a top view of the L-shaped connecting plate in some embodiments of this application.

[0018] Explanation of reference numerals in the attached figures: 100. Framework 110. Partition 120. Fluid pipeline 130. Slide groove 200. Support frame 210. Upper bracket 220. Lower support 230. L-shaped connecting plate 240. Mounting hole 250. Cooling pipes 260. Gate valve 270. Through hole 280. Slider 310. Interface Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is referred to as being "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figures 1-5As shown, the present invention provides a drawer-type heavy-duty truck battery pack cooling system, comprising: A frame 100 is provided with a plurality of partitions 110 for dividing the frame 100 into a plurality of receiving cavities, wherein: each partition 110 is provided with a fluid pipe (not shown) inside, the two ends 120 of the fluid pipe are located at one end of the partition 110 and are used to connect to an external cooling medium; and the side wall of the partition 110 is provided with a plurality of interfaces 310, the plurality of interfaces 310 being in fluid communication with the fluid pipe inside the partition 110 respectively; Multiple support frames 200 are arranged side by side and movably connected in a receptacle. Each support frame 200 includes an upper bracket 210, a lower bracket 220, and an L-shaped connecting plate 230. The upper bracket 210 and the lower bracket 220 are provided with multiple mounting holes 240 for installing external batteries. Multiple cooling pipes 250 are connected between the upper bracket 210 and the lower bracket 220 and spaced apart from the mounting holes 240. Both ends of each cooling pipe 250 are connected to the interface 310 on the partition plate 110. One end of the L-shaped connecting plate 230 is located between the upper bracket 210 and the lower bracket 220 to fix the upper bracket 210 and the lower bracket 220. The other end of the L-shaped connecting plate 230 is located on one side of the upper bracket 210 or the lower bracket 220 to connect the multiple external batteries installed in the mounting holes 240 to external electrical components to form a conductive circuit.

[0023] It should be noted that, Figure 3 A structural diagram showing the removal of the top cover of frame 100. Figure 3 The direction of the middle arrow indicates the direction in which the support frame 200 is pulled out and installed or removed into the frame 100. The partition 110 and / or the frame 100 are provided with water inlet holes and water outlet holes (i.e., interface 310) that communicate with the end 120 of the fluid pipe. The cooling pipe 250 provided on the support frame 200 is connected to the fluid pipe through the water inlet holes and water outlet holes (i.e., interface 310), thereby realizing the heat exchange between the external cooling medium and the external battery installed in the support frame 200; the external cooling medium can be water with a high thermal specific capacity.

[0024] In the above embodiment, firstly, the frame 100 is divided into multiple accommodating cavities by multiple partitions 110 disposed within the frame 100. Multiple support frames 200 for installing external batteries are then connected to these accommodating cavities via a pull-out mechanism, facilitating convenient disassembly and maintenance of the cooling system. Furthermore, the support frames 200 can be modularized for easy transport, significantly improving production and transport efficiency. Next, multiple cooling pipes 250, spaced apart from the installed external batteries, are connected to each support frame 200. The low-temperature cooling medium within the cooling pipes 250 exchanges heat with the external batteries within the support frame 200, rapidly removing the heat generated by the external batteries within the corresponding support frame 200, thus cooling the battery pack. Therefore, the cooling system provided in this application can effectively cool the internal and external batteries of the battery pack, featuring a simple structure, low cost, and excellent cooling effect.

[0025] In the above embodiment, the front side of the frame 100 is provided with two front side plates that are hinged to the left or right side plate, and the two front side plates are integrated by hinges. When multiple support frames 200 need to be disassembled or installed, the two front side plates are opened, and the support frame 200 can be pulled out and moved to the corresponding receiving cavity by matching the slider 280 on the support frame 200 with the sliding groove 130 on the frame 100.

[0026] In some embodiments provided by the present invention, a controller (not shown in the figure) is also included. The controller is connected to a temperature sensor (not shown in the figure) disposed in the support frame 200. The temperature sensor is disposed on the upper bracket 210 or the lower bracket 220 for detecting the temperature of the battery in the corresponding support frame 200.

[0027] In the above embodiments, the temperature sensor can be installed on either the upper bracket 210 or the lower bracket 220. The temperature sensor can be used to monitor the real-time temperature of the battery inside the support frame 200 and transmit the monitored temperature value to the controller. The controller can then make adaptive control commands based on the real-time temperature of the battery in the support frame 200.

[0028] In some embodiments provided by the present invention, the outer side of each of the cooling pipes 250 is fitted and connected to the outer side of the corresponding external battery installed in the support frame 200.

[0029] In the above embodiments, the outer side of each cooling pipe 250 is in close contact with the outer side of the external battery installed in the corresponding support frame 200. This structure can better facilitate heat exchange between the external batteries inside and outside the support frame 200, thereby improving the heat exchange efficiency to a certain extent.

[0030] In some embodiments provided by the present invention, each of the cooling pipes 250 is provided with a shut-off valve 260, which is connected to a controller for adjusting the flow rate of the cooling medium in the corresponding fluid pipe according to the control command of the controller.

[0031] In the above embodiments, by setting a shut-off valve 260 connected to the controller on each cooling pipe 250, the controller can send corresponding control commands to the corresponding shut-off valve 260 according to the real-time temperature value monitored by the temperature sensor, thereby realizing the adjustment of the flow rate of the low-temperature cooling medium in the cooling pipe 250 and achieving precise control of heat exchange.

[0032] In some embodiments provided by the present invention, a plurality of mounting holes 240 are evenly arranged on the upper bracket 210 and the lower bracket 220, and the external battery is fixed between the upper bracket 210 and the lower bracket 220 through the corresponding mounting holes 240.

[0033] In the above embodiment, by uniformly providing multiple mounting holes 240 on the upper bracket 210 and the lower bracket 220, this structure facilitates the fixing of the external batteries arranged side by side in the support frame 200, ensuring that the support frame 200 is installed as a whole as a battery swapping pack in the receiving cavity. At the same time, it also facilitates heat exchange between the cooling medium in the cooling pipe 250 and the batteries in the support frame 200.

[0034] In some embodiments provided by the present invention, the L-shaped connecting plate 230 is provided with a through hole 270 that matches the cooling pipe 250, and the end of each cooling pipe 250 passes through the through hole 270 and is connected to the fluid pipe.

[0035] In the above embodiments, by providing a through hole 270 on one end of the L-shaped connecting plate 230 and the upper bracket 210 or the lower bracket 220, the cooling pipe 250 can be fixedly connected to the connecting plate through the through hole 270. When multiple cooling pipes 250 in the support frame 200 are connected in parallel, the end of each cooling pipe 250 passes through the through hole 270 and is connected to the corresponding fluid pipe. Moreover, each support frame 200 is pulled out and movably connected in the receiving cavity. Therefore, the end of each cooling pipe 250 and the end of each fluid pipe need to be provided with a matching quick connector. The quick connector can be a Kingham KZF series quick connector, which can achieve quick disassembly and assembly, and also ensure the sealing performance of the connection between the cooling pipe 250 and the fluid pipe.

[0036] In some embodiments provided by the present invention, a plurality of cooling pipes 250 within each of the support frames 200 are connected in series, in parallel, or in a series-parallel connection.

[0037] In the above embodiments, the multiple cooling pipes 250 within each support frame 200 can be connected in series or in parallel. When the multiple cooling pipes 250 within the same support frame 200 are connected in series, they form a serpentine coil. In this case, only one shut-off valve 260 needs to be installed in each cooling pipe 250 within the support frame 200 to control the flow rate of the low-temperature cooling medium. When the multiple cooling pipes 250 within the same support frame 200 are connected in parallel, each cooling pipe 250 is connected to the end of a corresponding fluid pipe. In this case, the inlet end of each cooling pipe 250 is connected to the end of the fluid pipe through which the low-temperature cooling medium is fed, and the outlet end of each cooling pipe 250 is connected to the end of the fluid pipe through which the low-temperature cooling medium is discharged. Each cooling pipe 250 within the support frame 200 needs to be equipped with a shut-off valve 260 to control the flow rate of the low-temperature cooling medium. In comparison, while connecting multiple cooling pipes 250 in parallel results in higher cooling efficiency, it requires more installation components and is more expensive. On the other hand, connecting multiple cooling pipes 250 in series results in poorer cooling performance, but it is easier to install and maintain, requiring only two quick-connect fittings to connect to the end of the fluid pipe. This embodiment uses a series connection method.

[0038] In some embodiments provided by the present invention, the frame 100 and / or partition 110 are provided with sliding grooves 130 on opposite sides. Each upper bracket 210 and lower bracket 220 and L-shaped connecting plate 230 is provided with a slider 280 that matches the sliding groove 130 at one end connected to the lower bracket 220 or upper bracket 210. Each support frame 200 is connected to the receiving cavity by sliding the slider 280 and matching the sliding groove 130.

[0039] In the above embodiments, by providing sliding grooves 130 on opposite sides of the frame 100 and / or partition 110, each support frame 200 can be pulled out and movably connected to the corresponding receiving cavity by matching the slider 280 mounted on the upper bracket 210 or lower bracket 220 and the slider 280 mounted on the L-shaped connecting plate 230 with the sliding groove 130. This achieves quick installation and disassembly of the support frame 200 and also facilitates the modular structure of the support frame 200 for easy transportation. It should be noted that in actual applications, the outer side of the frame 100 should be equipped with side plates to prevent external dust from entering the frame 100 and causing contamination, and one side of the frame 100 should be hinged with a door for pulling out and installing multiple battery packs into the receiving cavity.

[0040] According to certain preferred embodiments of the invention, the cooling conduit is made of an aluminum-based carbon nanotube composite material, which comprises, based on its total weight: 2-4% by weight of carbon nanotubes; and The aluminum alloy comprises, based on its total weight: 6-8% by weight Si; 0.4-0.6% by weight Mg; 0.1-0.15% by weight Fe; 0.01-0.05% by weight Cu; and the balance Al.

[0041] Specifically, the composition design of this aluminum-based carbon nanotube composite material is not a simple addition of components, but a precise optimization based on the actual working conditions of the heavy-duty truck battery pack cooling system (such as frequent pulling and vibration, high and low temperature cycles, coolant corrosion, and lightweight requirements).

[0042] Specifically, carbon nanotubes, as a functional reinforcing phase in composite materials, are crucial for balancing thermal conductivity, mechanical strength, and processing feasibility when their content ranges from 2% to 4% by weight. From a performance perspective, heavy-duty truck battery packs can generate 60-80W of instantaneous heat from a single battery module during fast charging or full-load discharge, requiring cooling channels with high thermal conductivity. When the carbon nanotube content is less than 2% by weight, it cannot form a continuous thermal conductivity pathway in the aluminum alloy matrix—scanning electron microscopy (SEM) observations show that at a content of 1.5% by weight, carbon nanotubes are isolated and dispersed. When the carbon nanotube content is greater than 4% by weight, the high specific surface area of ​​the carbon nanotubes makes them prone to aggregation, causing fluctuations in thermal conductivity exceeding 25%, stress concentration within the material, decreased tensile strength, and reduced adhesion. Within the 2-4% by weight range, carbon nanotubes can form a continuous thermal conductivity network, while simultaneously increasing tensile strength through fiber reinforcement, achieving a weight reduction of 18%-20%, and further improving the performance of the cooling channels.

[0043] In addition, in order to improve the mechanical properties and corrosion resistance of the cooling pipes, the aluminum alloy comprises, based on its total weight: 6-8% by weight Si; 0.4-0.6% by weight Mg; 0.1-0.15% by weight Fe; 0.01-0.05% by weight Cu; and the balance Al.

[0044] According to certain preferred embodiments of the present invention, the aspect ratio of the carbon nanotubes is in the range of 500:1 to 800:1. The aspect ratio directly affects the thermal conductivity and reinforcing effect of the carbon nanotubes. When the aspect ratio of the carbon nanotubes is less than 500:1 (e.g., 300:1), the carbon nanotubes are shorter (only 3 μm when the outer diameter is 10 nm), the thermal conductivity density is low, the thermal conductivity is lower than that at 500:1, and they are easily pulled out under stress, resulting in low tensile strength and shortened fatigue life. When the aspect ratio of the carbon nanotubes is greater than 800:1 (e.g., 1000:1), the carbon nanotubes are prone to entanglement and aggregation, resulting in large performance fluctuations and reduced molding efficiency. This leads to an increase in the contact gap between the cooling pipes and other components in the cooling system of the drawer-type heavy truck battery swapping pack, thereby increasing the thermal resistance.

[0045] Example In this invention, unless otherwise specified, all reagents used are commercially available products and are used directly without further purification.

[0046] Examples 1-3 (Composite materials of the present invention) Example 1 is carried out according to the following steps.

[0047] I. Carbon Nanotube Pretreatment Multi-walled carbon nanotubes with an aspect ratio of 500:1 and a purity of 99.6% were selected and laid flat on the sample tray of a low-temperature plasma treatment instrument (1-2 mm thick). The power was set to 200W and the treatment time to 15 min, with oxygen introduced at a rate of 50 mL / min. Under the plasma environment, carbon atoms on the surface of the carbon nanotubes reacted with oxygen to generate hydroxyl groups, achieving hydroxylation modification.

[0048] II. Aluminum Alloy Smelting Prepare industrial pure aluminum (99.7%) and its corresponding intermediate alloy according to the following proportions: Si 6 wt%, Mg 0.4 wt%, Fe 0.1 wt%, Cu 0.01 wt%, and Al balance. After cleaning the surface oxide scale, add the aluminum to a 50kW medium-frequency induction furnace. Heat the furnace to 720℃ until the raw materials melt, stir at 300 r / min for 15 min, and then hold at that temperature for 30 min.

[0049] III. Composite Dispersion The pretreated carbon nanotubes prepared in step (I) above are added to the aluminum alloy melt prepared in step (II) above at a ratio of 2% by weight. A 300W ultrasonic device is turned on and mechanical stirring is performed at 300r / min. At the same time, 5L / min of argon gas is passed through to cover the surface of the melt to prevent oxidation, so as to obtain a composite melt.

[0050] IV. Molding Process The composite melt prepared in step (III) above is transferred to a horizontal extruder and extruded at 680℃ and 1.0m / min (pipe size: 1m length, 10mm inner diameter, 2mm wall thickness). Then the pipe is placed in a box-type aging furnace and held at 120℃ for 4 hours to obtain a cooling pipe.

[0051] Examples 2-3 were carried out in a similar manner to Example 1, except that the experimental parameters were adjusted as shown in Table 1 below.

[0052] Table 1 Material parameters of Examples 1-3

[0053] Comparative Examples 1-3 The following materials were selected as comparative examples, and the parameters are shown in Table 2 below: Table 2 Material parameters of Comparative Examples 1-3

[0054] The cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3 above were subjected to the following tests.

[0055] Thermal conductivity test (in accordance with GB / T 22588-2008 "Measuring thermal diffusivity or thermal conductivity by flash method") Test conditions: Temperature 25℃ (room temperature), 60℃ (battery operating temperature); cooling medium was 50% ethylene glycol aqueous solution (flow rate 0.8m / s), simulating the actual cooling environment of a heavy-duty truck battery pack. The test results are shown in Table 3 below.

[0056] Table 3. Test results of thermal conductivity of the cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0057] As can be seen from the results in Table 3 above, although the thermal conductivity of Examples 1-3 is lower than that of Comparative Example 2 (copper tube), it is much higher than that of Comparative Example 1 (pure aluminum tube) and Comparative Example 3. Moreover, the thermal conductivity is stable at a working temperature of 60°C, and the heat of the battery can be quickly dissipated, which fully meets the heat dissipation requirements of the drawer-type heavy truck battery pack cooling system.

[0058] Mechanical property testing (in accordance with GB / T 228.1-2021 "Metallic materials - Tensile testing - Part 1: Test at room temperature") Test conditions: room temperature 25℃, tensile rate 5mm / min; fatigue test adopted axial fatigue test with stress ratio R=0.1 ( (Multiple cycles) simulating the condition where the cooling pipes are frequently pulled and pulled along with the support frame. The test results are shown in Table 4 below.

[0059] Table 4. Mechanical property test results of the cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0060] As can be seen from the results in Table 4, the tensile strength and fatigue strength of Examples 1-3 are superior to those of Comparative Examples 1-3, especially in terms of fatigue resistance. Comparative Example 1 (pure aluminum tube) has insufficient fatigue strength; Comparative Example 3 has limited reinforcing effect due to its low carbon nanotube content and small aspect ratio; Comparative Example 2 (copper tube) has good plasticity, but its tensile strength and fatigue strength are low, making it prone to breakage under long-term tension.

[0061] Corrosion resistance test (based on GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test and Coolant Immersion Test") Test conditions: 1. Salt spray test: 5% NaCl solution, 35℃, 1000h; 2. Coolant immersion: 50% ethylene glycol aqueous solution, 60℃, 5000h. The test results are shown in Table 5 below.

[0062] Table 5. Corrosion resistance test results of the cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0063] As can be seen from the results in Table 5, the corrosion resistance of Examples 1-3 is far superior to that of Comparative Example 1 (pure aluminum tube) and Comparative Example 3. Without being bound by theory, it is believed that Comparative Example 1, lacking carbon nanotube reinforcement and Cu passivation, suffers severe corrosion; Comparative Example 3, with an Fe content exceeding 0.15%, exhibits intergranular corrosion, shortening its service life; and Comparative Example 2 (copper tube), although resistant to salt spray, easily generates corrosion products in ethylene glycol, posing a risk of leakage even with long-term use.

[0064] Lightweight and fit test 1. Lightweight test: Weigh a pipe that is 1m long, 10mm inner diameter, and 2mm wall thickness, and calculate its weight and density; 2. Fit Test: Measure the fit gap between the pipe and the surface of the standard battery (curvature radius 50mm) (according to GB / T 1804-2000 "General Tolerances - Tolerances for Linear and Angular Dimensions Without Specified Tolerances"). The test results are shown in Table 6 below.

[0065] Table 6. Lightweighting and fit test results of the cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0066] As can be seen from the results in Table 6 above, the weight of Examples 1-3 is significantly reduced compared to Comparative Example 1 (pure aluminum tube); the bonding gap is only 0.10-0.12mm, which is much smaller than that of Comparative Example 1 (0.20mm) and Comparative Example 3 (0.18mm), thereby reducing thermal resistance and improving heat exchange efficiency.

[0067] The present invention provides a detailed description of a drawer-type heavy-duty truck battery pack cooling system and its application. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A drawer-type heavy-duty truck battery pack cooling system, characterized in that, include: The frame is provided with a plurality of partitions for dividing the frame into a plurality of receiving cavities, wherein: each partition is provided with a fluid pipe inside, the two ends of the fluid pipe are located at one end of the partition and are used to connect to an external cooling medium; and the side wall of the partition is provided with a plurality of interfaces, the plurality of interfaces being fluidly connected to the fluid pipe inside the partition respectively. Multiple support frames are arranged side by side and movably connected in a receptacle. Each support frame includes an upper bracket, a lower bracket, and an L-shaped connecting plate. The upper and lower brackets are provided with multiple mounting holes for installing external batteries. Multiple cooling pipes are connected between the upper and lower brackets and spaced apart from the mounting holes. Both ends of each cooling pipe are connected to the interface on the partition plate. One end of the L-shaped connecting plate is located between the upper and lower brackets to fix the upper and lower brackets. The other end of the L-shaped connecting plate is located on one side of the upper or lower bracket and is used to connect the multiple external batteries installed in the mounting holes to external electrical components to form a conductive circuit.

2. The drawer-type heavy-duty truck battery pack cooling system as described in claim 1, characterized in that, It also includes a controller, which is connected to a temperature sensor installed in the support frame. The temperature sensor is installed on the upper or lower support frame to detect the temperature of the battery in the corresponding support frame.

3. The drawer-type heavy-duty truck battery pack cooling system as described in claim 1, characterized in that, The outer side of each of the cooling pipes is fitted and connected to the outer side of the corresponding external battery installed in the support frame.

4. The drawer-type heavy-duty truck battery pack cooling system as described in claim 1, characterized in that, Each of the cooling pipes is equipped with a shut-off valve, which is connected to the controller to adjust the flow rate of the cooling medium in the corresponding fluid pipe according to the controller's control instructions.

5. The drawer-type heavy-duty truck battery pack cooling system as described in claim 1, characterized in that, Multiple mounting holes are evenly arranged on the upper or lower bracket, and the external battery is fixed between the upper and lower brackets through the corresponding mounting holes.

6. The drawer-type heavy-duty truck battery pack cooling system as described in claim 2, characterized in that, The L-shaped connecting plate has through holes that match the cooling pipes, and the end of each cooling pipe passes through the through hole to connect with the fluid pipe.

7. The drawer-type heavy-duty truck battery pack cooling system as described in claim 2, characterized in that, Multiple cooling pipes within each of the support frames are connected in series, in parallel, or in a series-parallel configuration.

8. The drawer-type heavy-duty truck battery pack cooling system as described in claim 2, characterized in that, The frame and / or partition are provided with sliding grooves on opposite sides. Each upper or lower support and the end of the L-shaped connecting plate connected to the lower or upper support are provided with a slider that matches the sliding groove. Each support frame is connected to the receiving cavity in a pull-out manner by matching the slider with the sliding groove.

9. The drawer-type heavy-duty truck battery pack cooling system as described in claim 1, characterized in that, The cooling conduit is made of an aluminum-based carbon nanotube composite material, which comprises, based on its total weight: 2-4% by weight of carbon nanotubes; and The aluminum alloy comprises, based on its total weight: 6-8% by weight Si; 0.4-0.6% by weight Mg; 0.1-0.15% by weight Fe; 0.01-0.05% by weight Cu; and the balance Al.

10. The drawer-type heavy-duty truck battery pack cooling system as described in claim 9, characterized in that, The aspect ratio of the carbon nanotubes is in the range of 500:1 to 800:1.

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