Composite flow channel liquid cooling plate for vehicle power battery and design method of composite flow channel liquid cooling plate

Abstract

The invention discloses a composite flow channel liquid cooling plate for a vehicle power battery and a design method thereof, the liquid cooling plate comprises a cavity formed by an upper plate wall and a lower plate wall, the cavity is internally provided with a composite flow channel system, and a cooling medium circulates in the composite flow channel system; the composite flow channel system is formed by combining U-shaped flow channels, parallel flow channels and snake-shaped flow channels through spatial layout, the U-shaped flow channels serve as a main frame, and the U-shaped flow channels are symmetrically arranged on the two sides of a cavity to serve as main flow inlets; the two U-shaped flow channels are connected through two flow paths containing snakelike flow channels, and the two flow paths are penetrated by three parallel flow channels at the same time. By combining the low flow resistance characteristic of the U-shaped flow channel, the multi-path temperature equalization capability of the parallel flow channel and the long-path enhanced heat exchange advantage of the snake-shaped flow channel, the optimal balance between the heat dissipation performance and the energy consumption efficiency is realized on the system level.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power battery design, in particular to a composite channel liquid cooling plate for vehicle power battery and a design method thereof. BACKGROUND

[0002] With the rapid development of the electric vehicle industry, the performance, safety and life of the power battery have become key factors. A large amount of heat is generated in the battery during charging and discharging, and if it cannot be dissipated in time and effectively, the temperature of the battery pack will rise and even thermal runaway will occur, which seriously threatens safety; at the same time, uneven temperature distribution will accelerate the aging of the battery, affecting its capacity and cycle life. Therefore, the development of an efficient and reliable thermal management system, the core of which is to make the battery pack work in an appropriate temperature range and maintain excellent temperature uniformity, has become a technical challenge that the industry urgently needs to solve. Among the many heat dissipation methods, liquid cooling is widely considered as the mainstream technology to solve the heat dissipation problem of high-energy-density batteries due to its high efficiency and compactness.

[0003] The performance core of the liquid cooling system lies in the design of the internal flow channel structure. At present, the traditional flow channel design mainly focuses on several basic forms, but each has its inherent defects, forming an irreconcilable "technical contradiction": Parallel flow channel: Although it has the advantages of small flow resistance and low pressure drop, it has the inherent problem of uneven flow distribution, which easily leads to the retention of cooling liquid in some flow channels, resulting in poor temperature uniformity on the surface of the battery and high risk of local overheating. Serpentine flow channel: By lengthening the cooling liquid flow path, it can effectively enhance heat exchange and has good heat dissipation performance. However, its long and winding flow channel will bring about a huge flow resistance, resulting in a significant increase in system pressure drop, which requires a larger power pump to drive, increasing system energy consumption and operating noise. U-shaped flow channel: Its structure is relatively simple, and its performance is between parallel and serpentine flow channels, but it does not show outstanding advantages in any dimension of heat dissipation, temperature uniformity or flow resistance. For modern power battery systems that pursue extreme comprehensive performance, it is often not desirable.

[0004] The above-mentioned traditional single flow channel design cannot simultaneously achieve the best performance in the three core performance indicators of "high-efficiency heat dissipation", "low temperature difference" and "low flow resistance", forcing designers to make a choice and making it difficult to meet the increasingly demanding requirements of vehicle power batteries for thermal management performance. SUMMARY

[0005] The purpose of the present application is to provide a composite channel liquid cooling plate for vehicle power battery and a design method thereof, which combines the low flow resistance characteristics of the U-shaped flow channel, the multi-path temperature uniformity of the parallel flow channel and the long-path heat exchange enhancement advantages of the serpentine flow channel, and realizes the best balance between heat dissipation performance and energy efficiency at the system level.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions: A composite flow channel liquid cooling plate for a vehicle power battery, comprising a cavity composed of an upper plate wall and a lower plate wall, a composite flow channel system is arranged in the cavity, and a cooling medium flows through the composite flow channel system; the composite flow channel system is composed of U-shaped flow channels, parallel flow channels and serpentine flow channels through spatial layout, the U-shaped flow channels are taken as a main frame, and the U-shaped flow channels are symmetrically arranged on both sides of the cavity as main flow inlets; two U-shaped flow channels are connected by two flow paths containing serpentine flow channels, and the two flow paths are also penetrated by three parallel flow channels. The structure of the composite flow channel system is determined by five parameters, i.e., the width of the U-shaped flow channel, the width of the parallel / serpentine flow channel, the depth of the flow channel, the width of the inlet and outlet, and the thickness of the upper and lower plate walls.

[0007] Preferably, the width of the U-shaped flow channel is 5.0 mm to 7.5 mm, the width of the parallel / serpentine flow channel is 5.0 mm to 7.5 mm, the depth of the flow channel is 4.0 mm to 8.5 mm, the width of the inlet and outlet is 10.0 mm to 20.0 mm, and the thickness of the upper and lower plate walls is 1.0 mm to 3.5 mm.

[0008] Preferably, the material of the upper plate wall and the lower plate wall is aluminum alloy or copper; and the cooling medium flowing through the composite flow channel system is water or glycol solution.

[0009] The application also provides a design method of the composite flow channel liquid cooling plate for the vehicle power battery, which is used for designing any one of the composite flow channel liquid cooling plates for the vehicle power battery and comprises the following steps. S1, determining design variables and optimization objectives: the design variables include the width of the U-shaped flow channel, the width of the parallel / serpentine flow channel, the depth of the flow channel, the width of the inlet and outlet, and the thickness of the upper and lower plate walls, and the value ranges of the design variables are set; the optimization objectives include the average temperature of the liquid cooling plate surface, the pressure drop of the liquid cooling plate, and the temperature difference of the liquid cooling plate surface, all of which are expected to be minimized; S2, constructing an artificial neural network proxy model: a plurality of sample points are generated in the variable space set in S1 through optimal Latin hypercube sampling, computational fluid dynamics simulation is performed on each sample point to obtain the corresponding three optimization objective values, the artificial neural network proxy model is constructed and trained, and the mapping relationship between the design variables and the optimization objectives is established; S3, performing hybrid intelligent optimization: a hybrid strategy of genetic algorithm and particle swarm optimization algorithm is adopted to output a Pareto optimal solution set; S4, determining and verifying a final scheme: the optimal parameter combination is selected from the Pareto optimal solution set, and CFD simulation or experimental verification is performed; S5, product manufacturing: the composite flow channel liquid cooling plate is manufactured through 3D printing, numerical control machining or mold forming process according to the optimal parameter combination.

[0010] Preferably, in S2, the training of the artificial neural network agent model specifically comprises: Based on the multiple sets of sample points and the optimization target value data, the training of the artificial neural network agent model is completed to establish a nonlinear mapping relationship from the five design variables to the three optimization indexes.

[0011] Preferably, in S3, the executing of the hybrid intelligent optimization specifically comprises: Initializing the population, evaluating the fitness, alternately executing the GA / PSO operation, updating the Pareto front, and outputting the Pareto optimal solution set; in the optimization iteration, the selection, crossover, and mutation operations of the genetic algorithm are executed, and the speed and position updating operations of the particle swarm optimization are executed to balance the global search and local convergence.

[0012] The application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the design method of the composite flow channel liquid cooling plate for vehicle power batteries according to any one of the above.

[0013] According to the specific embodiments of the application, the following technical effects are disclosed: Based on the design concept of "complementary advantages and synergistic effects", the application innovatively proposes a composite flow channel scheme. The scheme aims to achieve the best balance between heat dissipation performance and energy efficiency at the system level through the optimization of the flow channel structure, combining the low flow resistance characteristics of the U-shaped flow channel, the multi-path uniform temperature capability of the parallel flow channel, and the long-path enhanced heat exchange advantage of the serpentine flow channel. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0015] Figure 1 The flowchart of the design method of the composite flow channel liquid cooling plate for vehicle power batteries provided by the application is shown in the figure. Figure 2 The structure diagrams of the four schemes in the embodiments of the application are shown in the figures. Among them, (a) is the structure of scheme one, (b) is the structure of scheme two, (c) is the structure of scheme three, and (d) is the structure of scheme four. Figure 3 The liquid cooling plate surface temperature rise broken line graphs under different schemes in the embodiments of the application are shown in the figures. Wherein, (a) is the surface average temperature change of different flow channel structures under 1C discharge rate, (b) is the surface average temperature change of different flow channel structures under 2C discharge rate, (c) is the surface average temperature change of different flow channel structures under 3C discharge rate; Figure 4 The pressure drop nephogram of the liquid cooling plate flow channel in different schemes in the embodiment of the application is shown in the following table: Wherein, (a) is the pressure drop nephogram of scheme one, (b) is the pressure drop nephogram of scheme two, (c) is the pressure drop nephogram of scheme three, (d) is the pressure drop nephogram of scheme four. Figure 5 The surface temperature rise broken line comparison diagram of the liquid cooling plate in the traditional scheme and the composite liquid cooling plate in the application is shown in the following table: Wherein, (a) is the surface average temperature change comparison of the traditional flow channel structure and the composite flow channel structure in the application under 1C discharge rate, (b) is the surface average temperature change comparison of the traditional flow channel structure and the composite flow channel structure in the application under 2C discharge rate, (c) is the surface average temperature change comparison of the traditional flow channel structure and the composite flow channel structure in the application under 3C discharge rate. Figure 6 The pressure drop nephogram comparison diagram of the liquid cooling plate flow channel in the traditional scheme and the composite liquid cooling plate flow channel in the application is shown in the following table: Wherein, (a) is the pressure drop nephogram of the U-shaped flow channel, (b) is the pressure drop nephogram of the serpentine flow channel, (c) is the pressure drop nephogram of the parallel flow channel, (d) is the pressure drop nephogram of the composite liquid cooling plate flow channel in the application. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application, and obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the application.

[0017] In order to make the above-mentioned purposes, features and advantages of the application more apparent and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0018] As Figure 2As shown in (d), the application provides a composite flow channel liquid cooling plate for a vehicle power battery, which comprises a cavity composed of an upper plate wall and a lower plate wall, a composite flow channel system is arranged in the cavity, and a cooling medium flows through the composite flow channel system; the composite flow channel system is composed of U-shaped flow channels, parallel flow channels and serpentine flow channels through spatial layout combination, the U-shaped flow channels are taken as a main frame, and the U-shaped flow channels are symmetrically arranged on both sides of the cavity as main flow inlets; two U-shaped flow channels are connected by two flow paths containing serpentine flow channels, and the two flow paths are also penetrated by three parallel flow channels. The structure of the composite flow channel system is determined by five parameters, including the width of the U-shaped flow channel, the width of the parallel / serpentine flow channel, the depth of the flow channel, the width of the inlet and outlet, and the thickness of the upper and lower plate walls.

[0019] Specifically, the constituent elements of the liquid cooling plate are as follows: (1) Composition Body: the liquid cooling plate body is composed of an upper plate wall and a lower plate wall, and the material can be aluminum alloy, copper or other high-thermal-conductivity metal materials.

[0020] Cooling medium: the cooling medium flowing through the flow channel is in a liquid state, such as water, ethylene glycol solution or other non-conductive cooling liquid.

[0021] (2) Structure The core of the liquid cooling plate lies in the innovative composite space structure of the internal flow channel. It is not a single form of flow channel, but a combination and communication of U-shaped flow channels, parallel flow channels and serpentine flow channels through a specific spatial layout, forming a unified and cooperative composite flow channel system.

[0022] The composite flow channel system is encapsulated in the cavity composed of the upper plate wall and the lower plate wall, and the specific structure is defined by the following five key size parameters: U-shaped flow channel width (a): the value range is 5.0 mm ~ 7.5 mm, and the optimal value is 6.83 mm.

[0023] Parallel / serpentine flow channel width (b): the value range is 5.0 mm ~ 7.5 mm, and the optimal value is 6.35 mm.

[0024] Flow channel depth (h): the value range is 4.0 mm ~ 8.5 mm, and the optimal value is 7.39 mm.

[0025] Inlet and outlet width (w): the value range is 10.0 mm ~ 20.0 mm, and the optimal value is 14.58 mm.

[0026] Upper and lower plate wall thickness (d): the value range is 1.0 mm ~ 3.5 mm, and the optimal value is 2.77 mm.

[0027] (3) Physical property parameters (functional parameters) The liquid cooling plate product, when applied to power battery thermal management, exhibits the following comprehensive performance parameters under the rated working conditions (such as a specific flow rate, an inlet temperature), which are the embodiment of its excellent performance: Heat dissipation performance: the liquid cooling plate can maintain an average surface temperature at a low level of 30.0°C ~ 31.0°C (up to 30.17°C under optimal conditions); Temperature uniformity: the maximum temperature difference of the liquid cooling plate surface can be controlled within 0.25°C (up to 0.19°C under optimal conditions); Flow resistance: the system pressure drop can be controlled within 250 Pa (136.43 Pa under optimal conditions).

[0028] As shown in Figure 1 The present application also provides a design method for a composite channel liquid cooling plate for a vehicle power battery, for designing any one of the above-mentioned composite channel liquid cooling plates for a vehicle power battery, comprising the following steps: S1, determining design variables and optimization objectives: the design variables include the U-shaped channel width, the parallel / serpentine channel width, the channel depth, the inlet / outlet width, and the upper and lower plate wall thickness, and the value range thereof is set; the optimization objectives include the liquid cooling plate surface average temperature, the liquid cooling plate pressure drop, and the liquid cooling plate surface temperature difference, all of which are expected to be minimized; S2, constructing an artificial neural network proxy model: a plurality of sample points are generated in the variable space set in S1 through optimal Latin hypercube sampling, computational fluid dynamics simulation is performed on each sample point to obtain the corresponding three optimization objective values, an artificial neural network proxy model is constructed and trained, and a mapping relationship between the design variables and the optimization objectives is established; S3, performing hybrid intelligent optimization: a hybrid strategy of genetic algorithm and particle swarm optimization algorithm is adopted to output a Pareto optimal solution set; S4, determining and verifying the final scheme: the optimal parameter combination is selected from the Pareto optimal solution set, and is verified through CFD simulation or experiment; S5, product manufacturing: according to the optimal parameter combination, the composite channel liquid cooling plate is manufactured through 3D printing, numerical control machining or mold forming process.

[0029] Specifically, the flow and process parameters of the method of the present application are as follows: The present method aims to obtain a liquid cooling plate structure with the best comprehensive performance through systematic design optimization. The complete flow is as follows: (1) determining design variables and optimization objectives Raw materials / input types: five key structural parameters of the liquid cooling plate, i.e. design variables: U-shaped channel width (a); Parallel to the serpentine channel width (b); Channel depth (h); Inlet / outlet width (w); Upper and lower plate wall thickness (d).

[0030] Raw material / input amount (value range): Set an implementable optimization space for each design variable: a: 5.0 mm ~ 7.5 mm; b: 5.0 mm ~ 7.5 mm; h: 4.0 mm ~ 8.5 mm; w: 10.0 mm ~ 20.0 mm; d: 1.0 mm ~ 3.5 mm.

[0031] Target product / output: Three key performance indicators of the liquid cooling plate, i.e. optimization targets: Average temperature of the liquid cooling plate surface (Y1), expected to be minimized.

[0032] Pressure drop of the liquid cooling system (Y2), expected to be minimized.

[0033] Temperature difference of the liquid cooling plate surface (Y3), expected to be minimized.

[0034] (2) Build a high-precision surrogate model Process flow: Sample point generation - High-fidelity CFD simulation - Neural network model training and verification.

[0035] Sampling method: Use optimal Latin hypercube sampling to generate 70 representative sample points in the variable space set in step (1).

[0036] Data acquisition: Perform computational fluid dynamics simulation on each sample point to obtain its corresponding three optimization target values (Y1, Y2, Y3).

[0037] Model training: Use the above 70 sets of data to train the artificial neural network surrogate model to establish an accurate nonlinear mapping relationship from the five design variables to the three performance indicators.

[0038] Precision control: The accuracy of the surrogate model needs to meet the condition that the determination coefficient R² is higher than 0.9.

[0039] (3) Perform hybrid intelligent optimization Process flow: Initialize population - Evaluate fitness - Alternately perform GA / PSO operations - Update Pareto front - Output optimal solution set.

[0040] Process parameters: Optimization algorithm: Hybrid strategy of genetic algorithm and particle swarm optimization algorithm.

[0041] Hybrid strategy: In optimization iterations, perform selection, crossover, and mutation operations of genetic algorithm with 70% probability, and perform velocity and position update operations of particle swarm optimization with 30% probability.

[0042] Key parameters: Population size is 125, and maximum number of iterations is 400.

[0043] Output: The final output of the algorithm is a set of Pareto optimal solutions within the variable range.

[0044] (4) Determine and verify the final scheme Process flow: Select from Pareto solution set - Determine optimal parameter combination - Perform CFD or experimental verification.

[0045] Process parameters: Selection criteria: Select the final scheme from the Pareto solution set according to engineering requirements (e.g., require average temperature Y1 to be within the range of 30.15°C to 30.25°C).

[0046] Optimal scheme: The set of optimal structural parameters determined by the above process is: a = 6.83 mm, b = 6.35 mm, h = 7.39 mm, w = 14.58 mm, d = 2.77 mm.

[0047] Verification criteria: The scheme is verified by CFD simulation or physical experiment, and the maximum relative error between the predicted value and the verification value should be less than 3% to confirm the reliability of the optimization result.

[0048] (5) Product manufacturing Process flow: According to the optimal structural parameters determined in step (4), manufacture the composite flow channel liquid cooling plate physical product through 3D printing, numerical control machining or mold forming process.

[0049] In specific embodiments, Scheme One adopts a composite of serpentine and parallel flow channels. The core design is: a complete serpentine flow channel as the main flow path, running through the inlet and outlet of the cold plate; on this basis, ten independent parallel flow channels vertically penetrate the serpentine flow channel, forming an interlaced network, which realizes the synergy of main flow guidance and local strengthening, and the specific structural layout is shown in Figure 2 (a).

[0050] Scheme two is a compound structure of U-shaped, parallel and serpentine three flow channels, specifically, the cooling liquid enters from the U-shaped inlet flow channel, and then is distributed to seven main parallel flow channels; in order to strengthen local heat exchange, two small serpentine structures are integrated in each parallel flow channel, this design mainly uses parallel as the main stem and internally embeds the serpentine, which aims to ensure flow distribution while improving heat exchange intensity, and the geometric model is shown in Figure 2 (b) of FIG.

[0051] Scheme three takes the serpentine flow channel as the core, and the fluid enters from the U-shaped inlet flow channel and is guided into two main serpentine flow channels; in order to optimize the temperature uniformity, each serpentine flow channel is transversely penetrated by two parallel flow channels, this design highlights the dominant position of the serpentine flow channel, and improves the temperature distribution through the parallel flow channel, and the corresponding three-dimensional structure is shown in Figure 2 (c) of FIG.

[0052] Scheme four takes the U-shaped flow channel as the main frame, which is symmetrically arranged on both sides of the cold plate as the main flow inlet; two U-shaped flow channels are connected by two flow channels containing small serpentine structures, and the two serpentine flow channels are also penetrated by three parallel flow channels, this scheme constructs a multi-stage compound flow channel design based on the U-shaped frame, and the complete structure is shown in Figure 2 (d) of FIG.

[0053] In the liquid cooling system, the flow channel structure of the liquid cooling plate has a crucial influence on its heat dissipation capacity. In order to objectively evaluate the influence, the present application carries out thermal simulation under the conditions of environmental temperature 30℃, cooling liquid inlet flow rate 0.1m / s, and inlet temperature 30℃, and takes the liquid cooling plate surface average temperature and the liquid cooling plate pressure drop as the core evaluation indexes, as shown in Figure 3 (a)-(c) of FIG.

[0054] As shown in Figure 3 (a)-(c) of FIG., Figure 4 (a)-(d) of FIG. The scheme one has the lowest pressure drop, but its heat dissipation capacity is insufficient to meet the high-efficiency cooling demand; on the contrary, the scheme three has strong heat dissipation capacity, but its pressure drop is the highest among all the schemes, which will lead to high pump power consumption. The pressure drops of the scheme two and the scheme four are similar, but the scheme four achieves a lower battery working temperature.

[0055] The prior art is taken as a comparative example to illustrate that the scheme of the present application solves the problems of the prior art: As shown in Figure 5 (a)-(c) of FIG., Figure 6The figures (a)-(d) show the inherent defects of traditional flow channels: parallel flow channels have the lowest pressure drop but poor heat dissipation; serpentine flow channels have strong heat dissipation but too high pressure drop; U-shaped flow channels are between the two but have no obvious advantages.

[0056] The present application successfully solves the technical contradiction: the heat dissipation performance (average temperature) of the inventive scheme of Example 4 is better than that of Comparative Example 1 and Comparative Example 3, the temperature uniformity (temperature difference) is optimal, and the pressure drop is far lower than that of Comparative Example 2 (serpentine flow channel) which has the best performance, only about 66% of it.

[0057] The present application achieves the best balance: the present application is not the best in a single indicator, but successfully balances the heat dissipation, temperature uniformity and flow resistance through the composite flow channel design, and the comprehensive performance is significantly better than any single traditional flow channel, which proves the outstanding technical progress and practicality of the present application.

[0058] The present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the design method of the composite flow channel liquid cooling plate for the vehicle power battery according to any one of the above.

[0059] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus necessary universal hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in terms of the contribution to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0060] The principles and embodiments of the present application are described herein by applying specific examples, and the above description of the embodiments is only to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A composite flow channel liquid cooling plate for automotive power batteries, characterized in that, The device includes a cavity consisting of an upper plate and a lower plate. A composite flow channel system is provided within the cavity, through which a cooling medium flows. The composite flow channel system is composed of U-shaped flow channels, parallel flow channels, and serpentine flow channels arranged in a spatial layout. The U-shaped flow channels serve as the main framework, with symmetrically arranged U-shaped flow channels on both sides of the cavity as the main inlets. Two U-shaped flow channels are connected by two flow paths containing serpentine flow channels, and these two flow paths are simultaneously penetrated by three parallel flow channels. The structure of the composite flow channel system is determined by five parameters: the width of the U-shaped flow channel, the width of the parallel / serpentine flow channel, the flow channel depth, the inlet and outlet width, and the thickness of the upper and lower plate walls.

2. The composite flow channel liquid cooling plate for automotive power batteries according to claim 1, characterized in that, The width of the U-shaped flow channel ranges from 5.0 mm to 7.5 mm, the width of the parallel / serpentine flow channel ranges from 5.0 mm to 7.5 mm, the flow channel depth ranges from 4.0 mm to 8.5 mm, the inlet and outlet width ranges from 10.0 mm to 20.0 mm, and the thickness of the upper and lower plate walls ranges from 1.0 mm to 3.5 mm.

3. The composite flow channel liquid cooling plate for automotive power batteries according to claim 1, characterized in that, The upper and lower plates are made of aluminum alloy or copper; the cooling medium flowing through the composite flow channel system is water or an aqueous solution of ethylene glycol.

4. A design method for a composite flow channel liquid cooling plate for automotive power batteries, characterized in that, The method for designing a composite flow channel liquid cooling plate for automotive power batteries as described in any one of claims 1-3 includes the following steps: S1. Determine design variables and optimization objectives: The design variables include the width of the U-shaped flow channel, the width of the parallel / serpentine flow channel, the flow channel depth, the inlet and outlet width, and the thickness of the upper and lower plate walls, and set their value ranges; The optimization objectives include the average surface temperature of the cold plate, the pressure drop of the liquid cooling plate, and the surface temperature difference of the liquid cooling plate, all of which are expected to be minimized. S2. Construct an artificial neural network surrogate model: Generate multiple sample points in the variable space set in S1 through optimal Latin hypercube sampling, perform computational fluid dynamics simulation on each sample point to obtain its corresponding three optimization target values, construct and train an artificial neural network surrogate model, and establish the mapping relationship between design variables and optimization targets. S3. Perform hybrid intelligent optimization: Use a hybrid strategy of genetic algorithm and particle swarm optimization algorithm to output the Pareto optimal solution set; S4. Determine and verify the final solution: Select the optimal parameter combination from the Pareto optimal solution set and verify it through CFD simulation or experiment. S5. Product manufacturing: Based on the optimal parameter combination, manufacture the composite flow channel liquid cooling plate through 3D printing, CNC machining or mold forming process.

5. The design method of a composite flow channel liquid cooling plate for automotive power batteries according to claim 1, characterized in that, In step S2, training the artificial neural network proxy model specifically includes: The artificial neural network surrogate model is trained based on multiple sets of sample points and optimization target values ​​to establish a nonlinear mapping relationship from five design variables to three optimization indices.

6. The design method of a composite flow channel liquid cooling plate for automotive power batteries according to claim 1, wherein step S3, performing hybrid intelligent optimization specifically includes: The process involves initializing the population, evaluating fitness, alternating between GA / PSO operations, updating the Pareto front, and outputting the Pareto optimal solution set. During the optimization iteration, the genetic algorithm performs selection, crossover, and mutation operations, while the particle swarm optimization performs velocity and position update operations to balance global search and local convergence.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the design method of a composite flow channel liquid cooling plate for automotive power batteries as described in claims 4-6.

Images