A drawer type heavy truck battery pack cooling system

Abstract

The application provides a drawer type heavy truck battery replacement battery pack cooling system, which comprises a frame, the frame is provided with a plurality of partitions, the inside of each partition is provided with a fluid pipe, both ends of the fluid pipe are located at one end of the partition, and a plurality of interfaces are arranged on the side wall of the partition and are in fluid communication with the fluid pipe; a plurality of support frames, each support frame comprises an upper support, a lower support and an L-shaped connecting plate, a mounting hole and a cooling pipe which is arranged at intervals from the mounting hole are arranged between the upper support and the lower support, both ends of the cooling pipe are connected with the interfaces on the partition, one end of the L-shaped connecting plate is located between the upper support or the lower support, and the other end is located on one side of the upper support or the lower support. The cooling pipe which is arranged at intervals from the mounting hole is connected in the support frame, heat exchange between the cooling medium and the external battery installed in the support frame is utilized, and the heat generated by the external battery in the support frame can be quickly taken away.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heavy truck battery pack cooling systems, and particularly relates to a drawer type heavy truck battery swap cooling system, which can effectively cool the heavy truck battery swap battery pack. BACKGROUND

[0002] The traditional heavy truck battery swap battery pack adopts air cooling or water cooling mode. The air cooling mode generally uses fans or air flow generated by vehicle driving to carry away the heat generated by the battery, and generally uses axial flow fans or centrifugal fans, and according to the battery layout, a series / parallel air duct is designed. However, due to the limited heat dissipation capacity of the air cooling mode, it is generally limited to scenarios with moderate ambient temperature. Compared with the air cooling mode, the water cooling mode has higher heat dissipation efficiency, but the water cooling mode system is complex, high in cost and difficult to maintain. In order to improve economic benefits, people continuously improve the structure or process of the water cooling mode. For example, application No. CN202220298797.8 discloses a water-cooled heavy truck battery swap power battery pack, which comprises a plurality of power battery units arranged in a stacked manner, an integrated connector arranged between the two stacked power battery units, and a main water inlet pipe and a main water outlet pipe; the power battery unit comprises a battery pack bottom shell, a battery pack upper cover located on the upper part of the battery pack bottom shell, and a plurality of battery modules arranged in a matrix in the battery pack bottom shell; a quick change connector for electrical conduction is arranged at one end of the battery pack bottom shell, and a plurality of locking pins and a battery center alignment module are arranged at the side of the battery pack bottom shell; the bottom of the battery pack bottom shell is provided with a water flow channel, which is in communication with the main water inlet pipe and the main water outlet pipe, so as to realize water cooling. In the actual application process, the water cooling structure is increased, which is beneficial to heat dissipation and improves the use safety and service life of the battery pack, and the application effect is better. However, this structure can only quickly remove the heat at the bottom of the battery pack bottom shell, and cannot quickly and effectively remove the heat generated by the power battery inside the battery pack.

[0003] Therefore, the application provides a cooling system capable of quickly dissipating heat of the power battery inside the drawer type heavy truck battery swap battery pack. SUMMARY

[0004] Therefore, the application provides a drawer type heavy truck battery swap battery pack cooling system to solve the technical problems in the background art.

[0005] The drawer type heavy truck battery swap battery pack cooling system provided by the application comprises:

[0006] A frame is provided with a plurality of partitions for dividing the frame into a plurality of accommodating cavities, wherein: an inner portion of each partition is provided with a fluid conduit, two ends of the fluid conduit are located at one end of the partition for connecting with an external cooling medium; and a plurality of interfaces are provided on a side wall of the partition, and the plurality of interfaces are respectively communicated with the fluid conduit in the inner portion of the partition;

[0007] A plurality of support frames are arranged side by side and are pullably movably connected in the accommodating cavities, each support frame comprises an upper support, a lower support and an L-shaped connecting plate, a plurality of mounting holes for mounting external batteries are provided on the upper support and the lower support, a plurality of cooling conduits are connected between the upper support and the lower support and are spaced apart from the mounting holes, two ends of each cooling conduit are respectively connected with the interfaces on the partition, one end of the L-shaped connecting plate is located between the upper support and the lower support for fixing the upper support and the lower support, the other end of the L-shaped connecting plate is located on one side of the upper support or the lower support for connecting the external batteries mounted in the mounting holes with external electrical elements to form a conduction circuit.

[0008] In some embodiments, a controller is further included, and the controller is connected with a temperature sensor arranged in the support frame, the temperature sensor is arranged on the upper support or the lower support for detecting the temperature of the battery in the corresponding support frame.

[0009] In some embodiments, an outer side surface of each cooling conduit is in abutting connection with an outer side surface of the corresponding external battery mounted in the support frame.

[0010] In some embodiments, a stop valve is arranged on each cooling conduit, and the stop valve is connected with the controller for adjusting the flow of the cooling medium in the corresponding fluid conduit according to the control instruction of the controller.

[0011] In some embodiments, the plurality of mounting holes are uniformly arranged on the upper support and the lower support, and the external batteries are fixed between the upper support and the lower support through the corresponding mounting holes.

[0012] In some embodiments, a through hole matching the cooling conduit is formed on the L-shaped connecting plate, and the end of each cooling conduit passes through the through hole to be connected with the fluid conduit.

[0013] In some embodiments, the plurality of cooling conduits in each support frame are connected in series, in parallel or in series-parallel.

[0014] In some embodiments, opposite sides of the frame and / or the partition are provided with a sliding groove, each upper support or lower support and the end of the L-shaped connecting plate connected with the lower support or the upper support are provided with a sliding block matching the sliding groove, and each support frame is pullably movably connected in the accommodating cavity through the matching of the sliding block and the sliding groove.

[0015] In some embodiments, the cooling pipe is made of an aluminum-based carbon nanotube composite material, which contains, based on its total weight:

[0016] 2-4% by weight of carbon nanotubes; and

[0017] 96-98% by weight of an aluminum alloy, which contains, based on its total weight: 6-8% by weight of Si; 0.4-0.6% by weight of Mg; 0.1-0.15% by weight of Fe; 0.01-0.05% by weight of Cu; and the balance of Al.

[0018] In some embodiments, the aspect ratio of the carbon nanotubes is in the range of 500:1-800:1.

[0019] The present application has the following beneficial effects:

[0020] The present application provides a drawer type heavy truck battery swap battery pack cooling system, which is characterized in that a plurality of cooling pipes are arranged at intervals between the connecting holes and the mounting holes in the support frame, and the low-temperature fluid in the cooling pipes exchanges heat with the external battery mounted in the support frame, so that the heat generated by the external battery in the support frame can be quickly removed. Therefore, the drawer type heavy truck battery swap battery pack cooling system provided by the present application can quickly and accurately exchange heat generated inside the heavy truck battery swap battery pack, and the support frame can also effectively protect the heavy truck battery during transfer, thereby effectively improving the economic benefit.

[0021] In addition, according to the preferred scheme of the present application, the cooling pipe is made of an aluminum-based carbon nanotube composite material. Carbon nanotubes have extremely high thermal conductivity (about 3000 W / m•K), and after being compounded with aluminum alloy, the overall thermal conductivity of the cooling pipe is improved, and the battery heat can be discharged faster. In addition, the addition of carbon nanotubes improves the tensile strength of the composite material while maintaining good plasticity, especially suitable for the needs of anti-vibration and anti-deformation under frequent pulling conditions. In addition, the aluminum-based composite material has lower density, which can achieve weight reduction and is beneficial to the overall lightweight of the heavy truck battery pack. On the other hand, the composite material exhibits excellent corrosion resistance in a cooling liquid (such as an ethylene glycol aqueous solution) environment, prolonging the service life and avoiding the risk of cooling liquid leakage due to corrosion. It is particularly emphasized that the aluminum-based carbon nanotube composite material described above has better plasticity and surface adaptability, can more closely fit the surface of the battery, reduce thermal resistance, and improve heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the support frame in some embodiments of the present application,

[0023] Figure 2 is Figure 1A structural diagram showing the structure without the L-shaped connecting plate.

[0024] Figure 3 This is a schematic diagram of the frame structure with the top cover removed in some embodiments of this application.

[0025] Figure 4 This is a schematic diagram of the series connection of cooling pipes in some embodiments of this application.

[0026] Figure 5 This is a top view of the L-shaped connecting plate in some embodiments of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Framework

[0029] 110. Partition

[0030] 120. Fluid pipeline

[0031] 130. Slide

[0032] 200. Support frame

[0033] 210. Upper bracket

[0034] 220. Lower support

[0035] 230. L-shaped connecting plate

[0036] 240. Mounting hole

[0037] 250. Cooling pipes

[0038] 260. Gate valve

[0039] 270. Through hole

[0040] 280. Slider

[0041] 310. Interface Detailed Implementation

[0042] 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.

[0043] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Like terms are used to describe like elements in the various figures and embodiments of the application.

[0044] 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 application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the terms "therefore" and "and / or" are used in the sense of their plain English meanings.

[0045] As shown in FIG. 1, Figures 1-5 The present application provides a drawer-type heavy truck battery pack cooling system, comprising:

[0046] a frame 100, the frame 100 is provided with a plurality of partitions 110 for dividing the frame 100 into a plurality of accommodation cavities, wherein: the inside of each partition 110 is provided with a fluid duct (not shown), both ends 120 of the fluid duct are located at one end of the partition 110 for connecting with an external cooling medium; and a plurality of interfaces 310 are provided on the side wall of the partition 110, which are respectively in fluid communication with the fluid duct inside the partition 110;

[0047] a plurality of support frames 200, the plurality of support frames 200 are arranged side by side and are pullably movably connected in the accommodation cavities, each support frame 200 comprises an upper support 210, a lower support 220 and an L-shaped connecting plate 230, a plurality of mounting holes 240 for mounting external batteries are provided on the upper support 210 and the lower support 220, a plurality of cooling ducts 250 are connected between the upper support 210 and the lower support 220, the cooling ducts 250 are spaced apart from the mounting holes 240, both ends of each cooling duct 250 are respectively connected with the interfaces 310 on the partition 110, one end of the L-shaped connecting plate 230 is located between the upper support 210 and the lower support 220 for fixing the upper support 210 and the lower support 220, the other end of the L-shaped connecting plate 230 is located at one side of the upper support 210 or the lower support 220 for connecting the plurality of external batteries mounted in the mounting holes 240 with external electrical elements to form a conduction circuit.

[0048] It should be noted that, Figure 3 a structural schematic view of the top cover of the frame 100, Figure 3The middle arrow direction refers to the direction in which the support frame 200 is pulled out of the frame 100 for installation or disassembly, the partition plate 110 and / or the frame 100 are provided with water inlet holes and water outlet holes (i.e., interfaces 310) that are in communication with the end portions 120 of the fluid pipes, and the cooling pipes 250 provided on the support frame 200 are in communication with the fluid pipes through the water inlet holes and the water outlet holes (i.e., the interfaces 310), so as to realize heat exchange between the external cooling medium and the external battery installed in the support frame 200; and the external cooling medium can be water with a large thermal capacity.

[0049] In the above embodiment, first, the frame 100 is divided into a plurality of accommodation cavities by the plurality of partition plates 110 provided in the frame 100, and the plurality of support frames 200 for installing external batteries are pullably and movably connected based on the plurality of accommodation cavities, so that the cooling system can be conveniently disassembled, maintained, and reassembled, and the manufacturer can also set the support frames 200 as modularized for convenient transportation, thereby greatly improving the production efficiency and transportation efficiency; then, a plurality of cooling pipes 250 are connected in each support frame 200 and are spaced apart from the installed external battery, and the low-temperature cooling medium in the cooling pipes 250 exchanges heat with the external battery in the support frame 200, so that the heat generated by the external battery in the corresponding support frame 200 can be quickly removed, and the battery swap pack is cooled. Therefore, the cooling system provided by the application can effectively cool the external battery in the battery swap pack, and has the characteristics of simple structure, low cost, and good cooling effect.

[0050] In the above embodiment, the front side of the frame 100 is provided with two front side plates that are hinged to the left side plate or the right side plate, and the two front side plates constitute a whole through the hinges. When the plurality of support frames 200 need to be disassembled or installed, the two front side plates are opened, and the support frame 200 is pullably and movably connected to the corresponding accommodation cavity based on the corresponding matching of the sliding block 280 on the support frame 200 and the sliding groove 130 on the frame 100.

[0051] In some embodiments provided by the application, a controller (not shown in the figure) is further included, and the controller is connected with a temperature sensor (not shown in the figure) provided in the support frame 200. The temperature sensor is provided on the upper support 210 or the lower support 220 and is used to detect the temperature of the battery in the corresponding support frame 200.

[0052] In the above embodiment, the temperature sensor can be provided on the upper support 210 or the lower support 220. The temperature sensor can be used to monitor the real-time temperature of the battery in the support frame 200 and transmit the monitored temperature value to the controller, and the controller can make adaptive control instructions according to the real-time temperature of the battery in the support frame 200.

[0053] In some embodiments provided by the present application, the outer side surface of each cooling pipe 250 is connected with the outer side surface of the corresponding external battery installed in the support frame 200.

[0054] In the above-mentioned embodiments, the outer side surface of each cooling pipe 250 is connected with the outer side surface of the corresponding external battery installed in the support frame 200, which can better exchange heat with the external battery in the support frame 200 and improve the heat exchange efficiency to a certain extent.

[0055] In some embodiments provided by the present application, a stop valve 260 is arranged on each cooling pipe 250, and the stop valve 260 is connected with a controller to adjust the flow of the cooling medium in the corresponding fluid pipe according to the control instruction of the controller.

[0056] In the above-mentioned embodiments, by arranging the stop valve 260 connected with the controller on each cooling pipe 250, the controller can send corresponding control instructions to the corresponding stop valve 260 according to the real-time monitoring temperature value of the temperature sensor, so as to realize the flow size adjustment of the low-temperature cooling medium in the cooling pipe 250 and achieve precise control of heat exchange.

[0057] In some embodiments provided by the present application, a plurality of mounting holes 240 are uniformly arranged on the upper support 210 and the lower support 220, and the external battery is fixed between the upper support 210 and the lower support 220 through the corresponding mounting hole 240.

[0058] In the above-mentioned embodiments, by uniformly arranging a plurality of mounting holes 240 on the upper support 210 and the lower support 220, this structure facilitates the fixation of the external batteries arranged side by side in the support frame 200, ensures that the support frame 200 is installed as a whole in the accommodation cavity, and facilitates the heat exchange between the cooling medium in the cooling pipe 250 and the batteries in the support frame 200.

[0059] In some embodiments provided by the present application, the L-shaped connecting plate 230 is provided with a through hole 270 matched with the cooling pipe 250, and the end of each cooling pipe 250 penetrates through the through hole 270 and is connected with the fluid pipe.

[0060] In the above embodiment, the cooling pipe 250 and the connecting plate are fixedly connected through the through hole 270, when the plurality of cooling pipes 250 in the support frame 200 are connected in parallel, at this time, the end of each cooling pipe 250 passes through the through hole 270 and is connected with the corresponding fluid pipe, and each support frame 200 is pullably and movably connected in the accommodating 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, which can be selected as the quick connector of KZF series of Jinhan, so that quick disassembly and sealing performance of the connection between the cooling pipe 250 and the fluid pipe can be ensured.

[0061] In some embodiments provided by the application, the plurality of cooling pipes 250 in each support frame 200 are connected in series, in parallel or in series-parallel.

[0062] In the above embodiment, the plurality of cooling pipes 250 in each support frame 200 can be connected in series or in parallel. When the plurality of cooling pipes 250 in the same support frame 200 are connected in series, the plurality of cooling pipes 250 are connected in series to form a serpentine coil, at this time, the cooling pipe 250 in the support frame 200 only needs to be provided with one stop valve 260 to control the flow of the low-temperature cooling medium. When the plurality of cooling pipes 250 in the same support frame 200 are connected in parallel, the plurality of cooling pipes 250 are respectively connected with the end of the corresponding fluid pipe, at this time, the inlet end of each cooling pipe 250 is connected with the end of the fluid pipe for feeding the low-temperature cooling medium, the outlet end of each cooling pipe 250 is connected with the end of the fluid pipe for discharging the low-temperature cooling medium, and each cooling pipe 250 in the support frame 200 needs to be provided with one stop valve 260 for controlling the flow of the low-temperature cooling medium. Compared with the series connection, the parallel connection has higher cooling efficiency, but needs more components and has higher cost. The series connection has lower cooling efficiency, but is easy to install and maintain, only two quick connectors are needed to connect with the end of the fluid pipe. The embodiment adopts the series connection.

[0063] In some embodiments provided by the application, the frame 100 and / or the partition plate 110 are provided with a sliding groove 130 on the opposite sides, one end of each upper support 210 and lower support 220 and L-shaped connecting plate 230 connected with the lower support 220 or upper support 210 is provided with a sliding block 280 matched with the sliding groove 130, and each support frame 200 is pullably and movably connected in the accommodating cavity through the sliding block 280 matched with the sliding groove 130.

[0064] In the above embodiment, by arranging the sliding grooves 130 on the opposite sides of the frame 100 and / or the partition plate 110, each support frame 200 is matched with the sliding block 280 and the sliding groove 130 arranged on the upper support 210 or the lower support 220 and the L-shaped connecting plate 230, so that the support frame 200 is pullably connected in the corresponding accommodating cavity, the quick mounting and dismounting of the support frame 200 is realized, and meanwhile, the support frame 200 is conveniently arranged as a modular structure convenient for transfer. It should be noted that in actual application, the outer side of the frame 100 should be provided with a side plate for preventing external dust from entering the frame 100 to cause pollution, and one side of the frame 100 is hingedly provided with a door for pullably mounting the plurality of battery packs in the accommodating cavities.

[0065] According to certain preferred embodiments of the present application, the cooling pipe is made of an aluminum-based carbon nanotube composite material containing, based on its total weight:

[0066] 2-4% by weight of carbon nanotubes; and

[0067] 96-98% by weight of an aluminum alloy containing, based on its total weight: 6-8% by weight of Si; 0.4-0.6% by weight of Mg; 0.1-0.15% by weight of Fe; 0.01-0.05% by weight of Cu; and the balance of Al.

[0068] Specifically, the component design of the aluminum-based carbon nanotube composite material is not a simple superposition of ingredients, but a precise optimization based on the actual working condition requirements of the heavy truck battery pack cooling system, such as frequent pull vibration, high and low temperature cycle, cooling liquid corrosion, lightweight requirement, etc.

[0069] Specifically, carbon nanotubes as a functional reinforcing phase of the composite material, the 2-4% by weight content interval is a key aspect of balancing the thermal conductivity, mechanical strength and processing feasibility. From the performance requirement, the instantaneous heat generation of a single battery module of the heavy truck battery pack can reach 60-80W when fast charging or full load discharging, and the cooling pipe needs to have high efficient heat conduction capacity. When the content of carbon nanotubes is <2% by weight, it cannot form a continuous heat conduction path in the aluminum alloy matrix - scanning electron microscope (SEM) observation shows that when the content is 1.5% by weight, the carbon nanotubes are in isolated and dispersed state. When the content of carbon nanotubes is >4% by weight, the carbon nanotubes are easy to agglomerate due to high specific surface area, which not only makes the fluctuation range of thermal conductivity exceed 25%, but also leads to stress concentration in the material, decrease of tensile strength and decrease of adhesion. Within the content range of 2-4% by weight of carbon nanotubes, the carbon nanotubes can form a continuous heat conduction network, and at the same time, the tensile strength is improved through the fiber reinforcement mechanism, in addition, the weight is reduced by 18%-20%, and the performance of the cooling pipe is further improved.

[0070] In addition, in order to improve the mechanical properties and corrosion resistance of the cooling pipeline, the aluminum alloy contains, based on the total weight: 6-8 wt% of Si; 0.4-0.6 wt% of Mg; 0.1-0.15 wt% of Fe; 0.01-0.05 wt% of Cu; and the balance of Al.

[0071] According to some preferred embodiments of the present application, the aspect ratio of the carbon nanotubes is in the range of 500:1-800:1. The aspect ratio directly affects the heat conduction and reinforcing effect of the carbon nanotubes. When the aspect ratio of the carbon nanotubes is less than 500:1 (such as 300:1), the carbon nanotubes are short in length (only 3 μm when the outer diameter is 10 nm), the density of heat conduction paths is low, the thermal conductivity coefficient is lower than that when the aspect ratio is 500:1, the stress is easy to pull out, the tensile strength is low, and the fatigue life is shortened. When the aspect ratio of the carbon nanotubes is greater than 800:1 (such as 1000:1), the carbon nanotubes are easy to entangle and aggregate, the performance fluctuates greatly, and the forming efficiency is reduced, thereby causing the fitting gap between the cooling pipeline and other components in the drawer-type heavy-duty truck battery pack cooling system to increase, resulting in an increase in thermal resistance.

[0072] Examples

[0073] In the present application, unless otherwise indicated, the reagents used are commercially available products, which are used directly without further purification treatment.

[0074] Examples 1-3 (composite material of the present application)

[0075] Example 1 is implemented according to the following steps.

[0076] I. Pretreatment of carbon nanotubes

[0077] Select multi-walled carbon nanotubes with an aspect ratio of 500:1 and a purity of 99.6%, lay them flat on a low-temperature plasma treatment instrument sample tray (thickness 1-2 mm), set the power to 200W, the treatment time to 15min, and the oxygen flow to 50mL / min. In the plasma environment, the carbon atoms on the surface of the carbon nanotubes react with oxygen to form hydroxyl groups, achieving hydroxylation modification.

[0078] II. Melting of aluminum alloy

[0079] Prepare industrial pure aluminum (99.7%) and corresponding intermediate alloy according to the ratio of Si 6 wt%, Mg 0.4 wt%, Fe 0.1 wt%, Cu 0.01 wt%, and Al balance, add them to a 50kW medium-frequency induction furnace after cleaning the surface oxide skin. Heat to 720℃ until the raw materials are melted, stir at 300r / min for 15min, and then keep the temperature for 30min.

[0080] III. Composite dispersion

[0081] The pretreated carbon nanotubes prepared in step (1) above were added into the aluminum alloy melt prepared in step (2) above at a proportion of 2% by weight, a 300W ultrasonic device was turned on and mechanical stirring at 300r / min was started, and 5L / min argon was passed to cover the surface of the melt to prevent oxidation, to obtain a composite melt.

[0082] IV. Forming Process

[0083] The composite melt prepared in step (3) above was transferred into a horizontal extruder and extruded at 680℃ and 1.0m / min (pipe size: 1m long, 10mm inner diameter, 2mm wall thickness), and then the pipe was placed in a box-type aging furnace and aged at 120℃ for 4h, to obtain a cooled pipe.

[0084] 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.

[0085] Table 1 Material parameters of Examples 1-3

[0086]

[0087] Comparative Examples 1-3

[0088] The following materials were selected as comparative examples, and the parameters are shown in Table 2 below:

[0089] Table 2 Material parameters of Comparative Examples 1-3

[0090]

[0091] The cooled pipes prepared in Examples 1-3 and Comparative Examples 1-3 above were subjected to the following tests.

[0092] Thermal conductivity performance test (according to GB / T 22588-2008 “Flash Method for Measuring Thermal Diffusivity or Thermal Conductivity”)

[0093] 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 heavy truck battery pack. The test results are shown in Table 3 below.

[0094] Table 3 Thermal conductivity performance test results of the cooled pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0095]

[0096] From the results of Table 3 above, it can be seen that the thermal conductivity of Examples 1-3 is lower than that of Comparative Example 2 (copper tube), but is much higher than that of Comparative Example 1 (pure aluminum tube) and Comparative Example 3, and the thermal conductivity is stable at a working temperature of 60°C, which can quickly conduct the heat of the battery and fully meet the heat dissipation requirements of the drawer-type heavy truck battery swap battery pack cooling system.

[0097] Mechanical property test (in accordance with GB / T 228.1-2021 "Metallic materials - Tensile test - Part 1: Room temperature test method")

[0098] Test conditions: room temperature 25°C, tensile rate 5mm / min; fatigue resistance test uses axial fatigue test with stress ratio R=0.1 (secondary cycle), simulating the working condition of frequent pulling of the cooling pipe with the support frame. Test results are shown in Table 4 below.

[0099] Table 4 Mechanical property test results of cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0100]

[0101] From the results of Table 4, it can be seen that the tensile strength and fatigue resistance of Examples 1-3 are better than those of Comparative Examples 1-3, especially the fatigue resistance. The fatigue resistance of Comparative Example 1 (pure aluminum tube) is insufficient; Comparative Example 3 has limited reinforcement effect due to low carbon nanotube content and small aspect ratio; Comparative Example 2 (copper tube) has good plasticity, but low tensile strength and fatigue resistance, and is prone to breakage during long-term pulling.

[0102] Corrosion resistance test (in accordance with GB / T 10125-2021 "Artificial atmosphere corrosion test - Salt spray test" and cooling liquid immersion test)

[0103] Test conditions: 1. Salt spray test: 5% NaCl solution, 35°C, 1000h; 2. Cooling liquid immersion: 50% ethylene glycol aqueous solution, 60°C, 5000h. Test results are shown in Table 5 below.

[0104] Table 5 Corrosion resistance test results of cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0105]

[0106] From the results of Table 5, it can be seen that the corrosion resistance of Examples 1-3 is much better than that of Comparative Example 1 (pure aluminum pipe) and Comparative Example 3. Without being bound by theory, it is believed that Comparative Example 1 is severely corroded due to the absence of carbon nanotube reinforcement and Cu passivation; Comparative Example 3 has intergranular corrosion due to the Fe content exceeding 0.15%, shortening the service life; Comparative Example 2 (copper pipe) is resistant to salt spray, but is prone to corrosion products in ethylene glycol, still having a risk of leakage in long-term use.

[0107] Lightweight and fit test

[0108] 1. Lightweight test: weigh the pipe with a length of 1 m, an inner diameter of 10 mm, and a wall thickness of 2 mm, and calculate the weight and density;

[0109] 2. Fit test: measure the fit gap of the pipe and the surface of the standard battery (radius of curvature 50 mm) (according to GB / T 1804-2000 "General Tolerance Tolerances for Linear and Angular Dimensions without Tolerance"). The test results are shown in Table 6 below.

[0110] Table 6 Lightweight and fit test results of the cooling pipes prepared in Examples 1-3 and Comparative Examples 1-3

[0111]

[0112] From the results of the above Table 6, it can be seen that the weight of Examples 1-3 is significantly reduced compared to Comparative Example 1 (pure aluminum pipe); the fit gap is only 0.10-0.12 mm, which is much smaller than that of Comparative Example 1 (0.20 mm) and Comparative Example 3 (0.18 mm), thereby reducing thermal resistance and improving heat exchange efficiency.

[0113] The above provides a detailed introduction to the drawer type heavy truck battery pack cooling system and its application. In this paper, specific examples are applied to explain the principles and implementation methods of the present application. The above examples are only used to help understand the core idea of the present application. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.

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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