Corrugated power battery liquid cooling plate and power assembly

Abstract

The utility model discloses a corrugated power battery liquid cooling plate which comprises a stamping plate and a bottom plate, two ends of the stamping plate are respectively provided with a liquid inlet and a liquid outlet, and the stamping plate is provided with a plurality of downward grooves; the stamping plate is arranged on the bottom plate in an overlapped mode, a cooling liquid circulation area is formed between the stamping plate and the bottom plate, one end of the cooling liquid circulation area is an inlet area communicated with a liquid inlet in the stamping plate, and the other end of the cooling liquid circulation area is an outlet area communicated with a liquid outlet in the stamping plate. The cooling liquid circulation area is divided into a plurality of flow channels by the grooves; the groove is divided into a groove front section, a groove middle section and a groove rear section which are sequentially connected end to end; and the middle section of the groove is corrugated. The utility model further discloses a power assembly. The heat exchanger has the advantages that the middle section of the groove is designed to be of the corrugated structure, centrifugal force is generated when fluid flows through the wave crests and the wave troughs by changing the shape of the cross section of the flow channel, turbulent energy of the fluid is increased, the thickness of a thermal boundary layer is reduced, and therefore heat transfer efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, and in particular to a corrugated power battery liquid cooling plate and power assembly. Background Technology

[0002] With the continuous development of electric vehicles, the performance, range, and safety of power batteries, as the main energy source, are receiving increasing attention from people and the market. To ensure stable output, long range, and extended lifespan of power batteries, it is crucial to promptly dissipate the large amount of waste heat generated during charging or operation. Power batteries have high requirements for their ideal operating temperature range. Taking the most popular lithium-ion batteries as an example, their optimal operating temperature range is 20℃ to 40℃, with a temperature difference between batteries not exceeding 5℃. Therefore, a suitable cooling system is needed to guarantee and improve the performance, lifespan, and safety of power batteries, preventing the accumulation of large amounts of waste heat that cannot be dissipated in time, leading to excessively high battery temperatures, accelerated battery material degradation, reduced cycle life and safety, and even thermal runaway and combustion accidents.

[0003] Currently, common cooling methods include air cooling, liquid cooling, and phase change material (PCM) cooling. While air cooling offers advantages such as low cost, flexible space arrangement, and light weight, its heat dissipation capacity is gradually becoming insufficient to meet practical needs as battery charging and discharging power demands continue to rise. Although PCM cooling can achieve high cooling efficiency within limited space, its long-term stable heat dissipation capacity is not high. Under high heat dissipation pressure, once the PCM reaches thermal saturation, its heat dissipation capacity decreases significantly, failing to meet subsequent heat dissipation requirements. In contrast, liquid cooling achieves a good balance in terms of performance, energy consumption, cost, safety, functionality, and compatibility, and is therefore widely used in the heat dissipation systems of power batteries.

[0004] However, liquid cooling plates, as the core component of liquid cooling heat dissipation, are usually designed as simple parallel direct current channels or serpentine flow channels. This conventional design has two main drawbacks. First, it is difficult to effectively cover the edge areas of the cooling section, resulting in dead zones in heat dissipation and low heat exchange efficiency. Second, it is prone to uneven flow distribution, which can lead to localized overheating of the battery, low heat dissipation efficiency, and uneven heat dissipation, seriously affecting the performance, lifespan, and safety of the power battery. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a corrugated power battery liquid cooling plate and power assembly, which aims to improve heat transfer efficiency.

[0006] The technical solution adopted by this utility model is as follows: a corrugated power battery liquid cooling plate, including a stamping plate and a base plate. The stamping plate has an inlet and an outlet at both ends, and multiple downward grooves are provided on the stamping plate between the inlet and outlet. The stamping plate is stacked on the base plate, and the bottom of the groove of the stamping plate is fixedly connected to the upper surface of the base plate. A coolant flow area is formed between the stamping plate and the base plate. One end of the coolant flow area is an inlet area connected to the inlet on the stamping plate, and the other end of the coolant flow area is an outlet area connected to the outlet on the stamping plate. The grooves divide the coolant flow area into multiple channels, and the two ends of each channel are connected to the inlet area and the outlet area, respectively.

[0007] Along the direction from the inlet area to the outlet area, the groove is divided into a front section, a middle section, and a rear section that are connected end to end; the middle section of the groove is corrugated.

[0008] According to the above scheme, the rear section of the groove and the front section of the groove are symmetrically located at both ends of the middle section of the groove; the front sections of each groove are symmetrically arranged with the inlet area as the center, and the middle sections of each groove are arranged parallel to each other.

[0009] According to the above scheme, the corrugation shape of the middle section of each groove is consistent with the graph of the trigonometric function. Taking the center of the stamping plate as the origin, the width direction of the stamping plate as the Y direction, and the length direction of the stamping plate as the X direction, a coordinate system is established. Then, the corrugation shape of the middle section of the groove satisfies the following trigonometric function relationship:

[0010] (1);

[0011] in, y The Y-coordinate of the groove is in mm; x is the X-coordinate of the groove, in mm; A is the amplitude, in mm; λ Wavelength, unit: mm ；h i For the first i The Y-axis distance from the groove to the center of the stamping plate, in mm.

[0012] According to the above scheme, the starting point of each groove is located on a circle with a radius of 80~90mm, centered on the vertical foot of the liquid inlet at the edge of the stamping plate.

[0013] According to the above scheme, there are two liquid inlets. The starting point of a groove is set at the center of the lower liquid inlet, and the rest are arranged symmetrically with the center line of the width direction of the stamping plate as the axis.

[0014] According to the above scheme, the front section of the groove includes an arc segment and a horizontal segment. The starting point of the arc segment is also the starting point of the front section of the groove. The ending point of the arc segment is horizontally tangent to the starting point of the horizontal segment, and the ending point of the horizontal segment is horizontally connected to the starting point of the middle section of the groove.

[0015] According to the above scheme, the stamping plate is provided with the first groove to the sixth groove in sequence along the width direction, forming 7 flow channels.

[0016] According to the above scheme, the distance between two adjacent grooves is 35~60mm.

[0017] According to the above scheme, the groove width is 6~10mm.

[0018] This utility model also discloses a power assembly, including the battery liquid cooling plate as described above, as well as a thermal pad and a battery module, wherein the base plate of the battery liquid cooling plate is connected to the battery module through the thermal pad.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. In this utility model, the middle section of the groove is designed as a corrugated structure. By changing the cross-sectional shape of the flow channel, centrifugal force is generated when the fluid flows through the crests and troughs, which increases the turbulent kinetic energy of the fluid, reduces the thickness of the thermal boundary layer, and thus improves the heat transfer efficiency.

[0021] 2. In this utility model, the groove is divided into a front section, a middle section, and a rear section along the inlet area to the outlet area, and is symmetrically arranged with the liquid inlet as the center. This design makes the length, bending angle, and flow path of each flow channel more consistent, reduces the local resistance deviation caused by the geometric difference of the flow channel, thereby balancing the flow distribution of each flow channel and improving the performance of the power battery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0023] Figure 2 This is a schematic diagram showing the separation of the stamping plate and the base plate in Example 1.

[0024] Figure 3 This is a schematic diagram showing the arrangement of the grooves in Example 1.

[0025] Figure 4 This is a schematic diagram of the groove in Example 1.

[0026] Figure 5 for Figure 4 Enlarged view of point C (showing the relevant structural parameters).

[0027] Figure 6 This is a schematic diagram of the power component in Example 2.

[0028] Figure 7 This is an exploded view of the power component in Example 2.

[0029] Figure 8This is the Pareto solution set for multi-objective optimization in this second embodiment.

[0030] Figure 9 This is a temperature cloud map of the heat exchange surface before and after optimization in this second embodiment.

[0031] Figure 10 This is a comparison chart of pressure drop and heat transfer coefficient before and after optimization in Example 2.

[0032] The components are as follows: 1. Stamping plate 1; 2. Groove; 2.1 to 2.6 are the first groove to the sixth groove respectively; 2.7. Front section of the groove; 2.7.1. Arc section; 2.7.2. Horizontal section; 2.8. Middle section of the groove; 2.9. Rear section of the groove; 3. Base plate; 3.1. Flow channel; 3.2. Connection position between the groove and the base plate; 4. Thermal pad; 5. Battery module; 6. Liquid inlet; 7. Liquid outlet. Detailed Implementation

[0033] To better understand this utility model, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-3 The corrugated power battery liquid cooling plate shown is specifically a corrugated power battery liquid cooling plate based on trigonometric functions, including a stamping plate 1 and a base plate 3.

[0035] The two ends of the stamping plate 1 are respectively provided with a liquid inlet 6 and a liquid outlet 7;

[0036] Multiple downward grooves 2 are provided on the stamping plate 1 between the liquid inlet 6 and the liquid outlet 7;

[0037] The stamping plate 1 is stacked on the base plate 3. The bottom of the groove 2 of the stamping plate 1 is fixedly connected to the upper surface of the base plate 3. A coolant flow area is formed between the stamping plate 1 and the base plate 3. One end of the coolant flow area is an inlet area that communicates with the liquid inlet 6 on the stamping plate 1, and the other end of the coolant flow area is an outlet area that communicates with the liquid outlet 7 on the stamping plate 1.

[0038] The groove 2 divides the coolant flow area into multiple flow channels 3.1, with each flow channel 3.1 connected to the inlet area and the outlet area at both ends, respectively.

[0039] In this utility model, the connection position 3.2 between the groove 2 and the base plate 3 is as follows: Figure 2 As shown.

[0040] Preferably, such as Figure 4As shown, along the direction from the inlet area to the outlet area, the groove 2 is divided into a groove front section 2.7, a groove middle section 2.8, and a groove rear section 2.9 connected end to end in sequence; the groove middle section 2.8 is corrugated; the groove rear section 2.9 and the groove front section 2.7 are symmetrically arranged at both ends of the groove middle section 2.8; each groove front section 2.7 is symmetrically arranged with the inlet area as the center, and each groove middle section 2.8 is arranged parallel to each other.

[0041] Preferably, the corrugation shape of the middle section 2.8 of each groove is consistent with the graph of a trigonometric function.

[0042] In this invention, a coordinate system is established with the center of the stamping plate 1 as the origin, the width direction of the stamping plate 1 as the Y direction, and the length direction of the stamping plate 1 as the X direction. The corrugated shape of the middle section 2.8 of the groove satisfies the following trigonometric function relationship:

[0043] (1);

[0044] in, y Here is the Y-coordinate of groove 2, in mm; x λ is the X-coordinate of groove 2, in mm; A is the amplitude, in mm; λ is the wavelength, in mm. h i For the first i The Y-axis distance from the groove to the center of the stamping plate 1, in mm, such as... Figure 3 As shown, the stamping plate 1 has a first groove 2.1 to a sixth groove 2.6 arranged sequentially along the width direction, forming 7 flow channels 3.1.

[0045] Preferably, the corrugation amplitude A of the middle section 2.8 of the groove is 0~30mm, and the wavelength λ is 400mm.

[0046] In this invention, the middle sections 2.8 of each groove are parallel to each other, and the middle sections 2.8 of each groove on the center of the width of the stamping plate 1 (that is, when x=0) are simultaneously at the crest or simultaneously at the trough; and the middle sections 2.8 of each groove before and after the center of the width of the stamping plate 1 have at least one crest or trough, that is, each middle section 2.8 of the groove includes at least two crests and one trough, or at least two troughs and one crest.

[0047] like Figure 5 As shown, the starting point of each groove 2 (that is, the starting point of the front section 2.7 of the groove) is located on a circle with a radius of 80~90mm (85mm is optional) centered on the perpendicular foot of the center of the liquid inlet 6 at the edge of the stamping plate 1. Figure 5As shown, the incident angles (i.e., the angles between the line connecting the starting point and the center of the circle and the width direction of the stamping plate 1) of the first groove 2.1 to the third groove 2.3 are 15~30°, 30~60°, and 45~90°, respectively. The fourth groove 2.4, the fifth groove 2.5, and the sixth groove 2.6 are symmetrically arranged with the third groove 2.3, the second groove 2.2, and the first groove 2.1, respectively. That is, the incident angles of the fourth groove 2.4, the fifth groove 2.5, and the sixth groove 2.6 are -90~-45°, -60~-30°, and -30~-15°, respectively. The design of each groove 2 should be based on the principle of non-interference; if there is interference between grooves 2, it will be excluded in the subsequent parameter optimization design process.

[0048] In this embodiment, there are two inlets 6. The starting point of a portion of the grooves (i.e., three grooves) is set at the center of the lower inlet 6, and the remaining grooves (i.e., the other three grooves) are arranged symmetrically about the centerline of the width direction of the stamping plate 1. The front section 2.7 of the groove includes an arc section 2.7.1 and a horizontal section. The starting point of the arc section 2.7.1 is also the starting point of the front section 2.7 of the groove. The end point of the arc section 2.7.1 is horizontally tangent to the starting point of the horizontal section, and the end point of the horizontal section is horizontally connected to the starting point of the middle section 2.8 of the groove. The incident angle of the first groove 2.1 is 25°, and the angle β1 between the tangent of the starting point of the corresponding arc section and the X-axis is 90°. The incident angle of the second groove 2.2 is 45°, and the angle β2 between the tangent of the starting point of the corresponding arc section and the X-axis is 60°. The incident angle of the third groove 2.3 is 65°, and the angle β3 between the tangent of the starting point of the corresponding arc section and the X-axis is 30°. If N grooves 2 are designed, the difference in incident angle between two adjacent grooves 2 shall not exceed 180° / N; the difference in angle between the starting tangent of the arc segment of two adjacent grooves 2 and the X-axis shall be 180° / N.

[0049] Preferably, the distance between two adjacent grooves 2 is 35~60mm. In this invention, the specific distance between two adjacent grooves 2 can be adjusted according to the actual situation.

[0050] Preferably, the width of the groove 2 is 6~10mm. In this invention, the width of the groove 2 is set to ensure the connection strength after the stamping plate 1 and the base plate 3 are brazed.

[0051] In this invention, the corrugated power battery liquid cooling plate is connected to the battery module 5 via a thermal pad 4 to conduct heat out of the battery module 5.

[0052] like Figure 6 and Figure 7 The power assembly shown includes a battery liquid cooling plate as described above, a thermal pad 4, and a battery module 5. The base plate 3 of the battery liquid cooling plate is connected to the battery module 5 through the thermal pad 4.

[0053] A structural optimization design method for corrugated power battery liquid cooling plate components is disclosed. The method involves: constructing a three-dimensional model of the battery liquid cooling plate component connected to the battery module 5 via a thermal pad 4; obtaining relevant structural parameters of the model and determining the variable parameters to be optimized; establishing a multi-objective optimization mathematical calculation model with the optimization objectives of maximizing the heat transfer coefficient of the battery liquid cooling plate component and minimizing the pressure drop at the inlet and outlet of the battery liquid cooling plate component, and using the temperature difference of the heat exchange surface as a constraint; performing simulation analysis on the three-dimensional model under different values ​​of variable parameters, and calculating the performance data of the battery liquid cooling plate component with corresponding values, including the heat transfer coefficient and pressure drop, using the multi-objective optimization calculation model; analyzing the liquid cooling plate performance data to obtain the Pareto solution set for multi-objective optimization, and selecting the Pareto front solution set; introducing a comprehensive evaluation score, and searching for the optimal solution in the Pareto front solution set to obtain the optimal values ​​of each structural parameter.

[0054] Example 1

[0055] like Figures 1-3 The corrugated power battery liquid cooling plate shown includes a stamped plate 1 and a base plate 3; the base plate 3 of the battery liquid cooling plate is connected to the battery module 5 via a thermal pad 4, as shown. Figure 6 and Figure 7 As shown.

[0056] Example 2

[0057] This embodiment optimizes the structural parameters of Embodiment 1. A method for optimizing the structural parameters of a corrugated power battery liquid-cooled plate is as follows:

[0058] Step 1: Construct a 3D model of the battery liquid cooling plate connected to the battery module 5 via the thermal pad 4, obtain the relevant model parameters, and determine the variable parameters to be optimized.

[0059] In this embodiment, the relevant model parameters are shown in Table 1; the structural parameters of the battery liquid cooling plate include the starting position of the groove 2, the spacing of the groove 2, the ripple amplitude of the groove 2, etc.; the variable parameters to be optimized are shown in Table 2. By optimizing the relevant parameters of the battery liquid cooling plate, the flow of the coolant can be changed, thereby changing the performance parameters of the liquid cooling plate and optimizing the performance of the battery liquid cooling plate.

[0060] Table 1 Relevant Model Parameters

[0061]

[0062] Table 2. Variable parameters to be optimized and their value ranges

[0063]

[0064] The conversion relationships for the relevant parameters are as follows:

[0065] (2).

[0066] In Table 1 and Formula (2), as follows Figure 5 As shown, Angle1 represents the incident angle α1 of the first groove 2.1; Angle2 represents the incident angle α2 of the second groove 2.2; Angle3 represents the incident angle α3 of the third groove 2.3; AngleIncrument1 represents the increment of Angle2 relative to Angle1, and AngleIncrument2 represents the increment of Angle3 relative to Angle2. Width1 represents the distance A1 between the third groove 2.3 and the fourth groove 2.4; Width2 represents the distance A2 between the second groove 2.2 and the third groove 2.3, mm; Width3 represents the distance A3 between the first groove 2.1 and the second groove 2.2, mm; WidthIncrument1 represents the increment of Width2 relative to Width1, and WidthIncrument2 represents the increment of Width3 relative to Width2, mm. Figure 4 As shown in Table 2, High represents the peak height h1 (mm), and Low represents the trough height h2 (mm). The initial values ​​and ranges of the relevant parameters are shown in Table 2. Step 2: With maximizing the heat transfer coefficient HTC of the cold plate and minimizing the pressure drop DP at the inlet and outlet of the cold plate as the optimization objectives, and the temperature difference of the heat exchange surface as the constraint, a multi-objective optimization mathematical calculation model is established.

[0067] In this invention, the multi-objective optimization calculation model is as follows:

[0068] (3);

[0069] In the formula, Represents the parameters of each variable to be optimized, where x 1 represents the angle of incidence of the first groove 2.1; x 2 represents the incident angle of the second groove 2.2; x 3 represents the incident angle of the third groove 2.3; x 4 represents the distance between the third groove 2.3 and the fourth groove 2.4, in mm; x 5. The distance between the second groove 2.2 and the third groove 2.3, in mm; x 6 represents the distance between the first groove 2.1 and the second groove 2.2, in mm; x 7 represents the peak height, in mm; x 8 represents the trough height; unit is mm; DP represents the inlet and outlet pressure drop, unit is mbar; HTC represents the heat transfer coefficient, unit is... ; This indicates the temperature difference between the heat exchange surfaces, in °C. The maximum temperature difference of the heat exchange surface is limited; in this embodiment, it is set to 5°C.

[0070] In this invention, the heat transfer coefficient HTC is calculated using the following formula:

[0071] (4);

[0072] In the formula Heat source power, expressed in W; Heat exchange surface area, m 2 ; , These represent the average temperature of the heat exchange surface and the average temperature of the fluid below the heat exchange surface, respectively, in °C.

[0073] In this invention, the pressure drop DP at the inlet and outlet of the battery liquid cooling plate is calculated using the following formula:

[0074] (5);

[0075] In the formula, , These represent the pressure at the inlet and outlet of the battery liquid cooling plate, respectively, in mbar.

[0076] In this invention, the calculation methods for the heat transfer coefficient HTC and the pressure drop DP at the inlet and outlet of the battery liquid cooling plate are existing mature technologies, and will not be described in detail here.

[0077] Step 3: After importing the 3D model into Star-CCM+ and meshing it, set boundary conditions, and combine the multi-objective optimization calculation model and the SHERPA hybrid adaptive algorithm (Simultaneous Hybrid Exploration that is Robust, Progressive, and Adaptive) to perform simulation analysis on the 3D model under different variable parameter values, and calculate the corresponding battery liquid cooling plate performance data, including heat transfer coefficient HTC and voltage drop DP.

[0078] In this invention, the model is imported into STAR-CCM+, and the mesh is obtained using its built-in automatic mesh generator. When setting up the relevant parameters, boundary conditions need to be defined. The mass flow rate and inlet temperature of the coolant at the inlet 6 of the battery liquid cooling plate are 0.4 kg / s and 30 ℃, respectively. The ambient temperature is set to 30 ℃, the outlet type is a pressure outlet, and the pressure is set to 0 Pa. Heat exchange between the liquid cooling plate and the air is ignored. A constant uniform heat source of 1000W is applied to the bottom of the heat-conducting pad 4, replacing the constant heat source of the battery. The temperature change of the heating surface of the heat-conducting pad 4 is used to replace its impact on the cooling performance of the battery. The flow model selected is the Realizable k-ε turbulence model. Steady-state calculations are used, with 2000 iteration steps. To ensure the cooling effect and considering practical considerations, the material of the battery liquid cooling plate is aluminum, and the coolant is a 50% ethylene glycol solution. The relevant parameters are shown in Table 3 below. To simplify the analysis, the following assumptions are made during the simulation: 1) The flow rate and heat of the coolant remain stable during the transfer process; 2) The fluid is incompressible, and the thermophysical properties of the coolant and liquid cooling plate materials are independent of temperature; 3) The solid-liquid interface is a no-slip boundary condition; 4) The influence of gravity is ignored.

[0079] Table 3. Relevant parameters of coolant and materials

[0080]

[0081] In this embodiment, some of the battery liquid cooling plate performance data are shown in Table 4.

[0082] Table 4 Performance data of battery liquid-cooled plates under different values ​​of variable parameters.

[0083]

[0084] In this invention, the number of evaluations for the SHERPA algorithm is typically 50 × the number of objective functions × the number of design variables; in this embodiment, 800 sets of data are used.

[0085] Step 4: Analyze the performance data of the liquid cooling plate to obtain the Pareto solution set for multi-objective optimization, and select the Pareto front solution set.

[0086] In this embodiment, as Figure 8 The diagram shows the obtained Pareto solution set, where the red dots represent the Pareto front solution set. The Pareto front solution set is a subset of the Pareto solution set, and it is the boundary or front portion formed by the objective function values ​​corresponding to all Pareto optimal solutions in the objective function space. It represents the solution of all optimal trade-offs in the multi-objective optimization problem. In this invention, the acquisition of the Pareto solution set and the Pareto front solution set are existing technologies and will not be described in detail here.

[0087] Step 5: Introduce comprehensive evaluation scores The optimal solution is found in the Pareto front solution set to obtain the best values ​​of each variable parameter.

[0088] In this invention, a comprehensive evaluation score is introduced. The comprehensive evaluation score of each group of data in the Pareto front solution set is calculated and compared. The optimal values ​​of each variable parameter in the group of data with the highest comprehensive evaluation score R are determined.

[0089] The overall evaluation score R is derived from the following equation:

[0090] (6);

[0091] In the formula: The score is a comprehensive evaluation score and has no unit. This is the weight matrix. L 1 、L 2 、L 3 represents the weighting coefficients for pressure drop, heat transfer coefficient, and temperature difference of the heat transfer surface, respectively, without units. This invention selects a design scheme where pressure drop and heat transfer coefficient each account for half of the weight; simultaneously, pressure drop should be as small as possible, therefore its weighting coefficient must be negative; thus, the weighting matrix is... =[-0.5,0.5,0], that is L 1 、L 2 、L 3. The values ​​are successively 0.5, 0.5, and 0; Furthermore, due to the order-of-magnitude differences between different objective functions, the evaluation metrics need to be normalized. This is the normalized evaluation index matrix; The corresponding indices are pressure drop, heat transfer coefficient, and temperature difference of the heat transfer surface, in that order. The calculation formula is as follows:

[0092] (7);

[0093] In formula (4), i = 1, 2, 3, which respectively represent the pressure drop, heat transfer coefficient and heat transfer surface temperature difference. fi The value corresponding to the indicator; fimin This is the minimum value corresponding to the indicator; fimax This refers to the maximum value corresponding to the indicator. The maximum and minimum values ​​are the maximum and minimum values ​​of each indicator among all the data obtained.

[0094] In this invention, using the fifth and sixth sets of data from Table 4 in the Pareto front solution set, the calculated performance indicators are as follows: pressure drops of 463.08 mbar and 480.52 mbar, and heat transfer coefficients of 2405.48 W / (m²·K) and 2422.03 W / (m²·K). The maximum and minimum pressure drops are 583.25 mbar and 360.89 mbar, respectively, and the maximum and minimum heat transfer coefficients are 2581.98 W / (m²·K) and 1664.46 W / (m²·K), respectively. The comprehensive evaluation scores R1 and R2 for these two sets of data are as follows:

[0095] R1=-0.5×(463.08-360.89) / (583.25-360.89)+0.5×(2405.48-1664.46) / (2581.98-1664.46)=0.174;

[0096] R2=-0.5×(480.52-360.89) / (583.25-360.89)+0.5×(2422.03-1664.46) / (2581.98-1664.46)=0.144.

[0097] Therefore, the parameters corresponding to R1=0.174, namely Angle1=28°, Angle2=44°, Angle3=62°, Width1=40mm, Width2=40mm, Width3=40mm, High=22mm, and Low=24mm, are selected as the relatively optimized scheme.

[0098] Table 5 Structural parameters and performance indicators before and after optimization

[0099]

[0100] In this embodiment, the optimal values ​​of each optimization parameter are obtained by comparing the comprehensive evaluation score R of each set of data in the Pareto front solution set. The values ​​of relevant structural parameters and corresponding performance indicators before and after optimization are shown in Table 5. The temperature contour maps of the heat exchange surface before and after optimization are shown in Table 5. Figure 9 As shown, the pressure drop and heat transfer coefficient before and after optimization are as follows: Figure 10 As shown in Table 5. Figure 9 and Figure 10 It can be seen that the final optimized solution has a smaller change in pressure drop compared to the original cold plate component, the heat transfer coefficient has increased by 10.66%, and the thermal uniformity of the heat transfer surface is still within the uniformity requirement range. The heat transfer effect has been greatly improved with only a 2.4% increase in pressure drop, meeting the design requirements. At the same time, the optimized solution has a significantly improved energy consumption ratio compared to the original solution, making it more economical and efficient.

[0101] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0102] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A corrugated power battery liquid cooling plate member, characterized in that, The liquid inlet and the liquid outlet are arranged at two ends of the stamping plate respectively, and a plurality of downward grooves are arranged on the stamping plate between the liquid inlet and the liquid outlet; the stamping plate is arranged on the bottom plate in a superposed manner, the bottom of the groove of the stamping plate is fixedly connected to the upper surface of the bottom plate, a cooling liquid flow passage is formed between the stamping plate and the bottom plate, one end of the cooling liquid flow passage is an inlet area in communication with the liquid inlet on the stamping plate, and the other end of the cooling liquid flow passage is an outlet area in communication with the liquid outlet on the stamping plate; the grooves divide the cooling liquid flow passage into a plurality of flow channels, and the two ends of each flow channel are in communication with the inlet area and the outlet area respectively. In the direction from the inlet area to the outlet area, the grooves are divided into groove front sections, groove middle sections and groove rear sections which are sequentially connected end to end; the groove middle sections are in a corrugated shape.

2. The corrugated power cell liquid cooling plate of claim 1, wherein, The groove rear sections are symmetrically arranged at the two ends of the groove middle sections relative to the groove front sections; the groove front sections are symmetrically arranged with the inlet area as the center, and the groove middle sections are arranged in parallel with each other.

3. The corrugated power cell liquid cooling plate of claim 2, wherein, The corrugated shape of each groove middle section is consistent with the image of a trigonometric function; a coordinate system is established with the center of the stamping plate as the origin, the width direction of the stamping plate as the Y direction and the length direction of the stamping plate as the X direction, and the corrugated shape of the groove middle section satisfies the following trigonometric function relationship: ； wherein, y Y coordinate of the groove, unit: mm; x X coordinate of the groove, unit: mm; A is the amplitude, unit: mm; The starting point position of each groove is located on a circle with a radius of 80-90 mm and a center of the vertical foot of the center of the liquid inlet on the edge of the stamping plate. Wavelength, unit: mm; h i The first i Y distance from the groove to the center of the stamping plate, unit: mm.

4. The corrugated power cell liquid cooling plate of claim 3, wherein, There are two liquid inlets, and the starting point positions of part of the grooves are arranged below the center of the liquid inlet, and the rest are symmetrically arranged with the centerline of the width direction of the stamping plate as the axis.

5. The corrugated power cell liquid cooling plate of claim 4, wherein, The groove front section includes a circular arc section and a horizontal section, and the starting point position of the circular arc section is also the starting point position of the groove front section; the end point of the circular arc section is connected to the starting point of the horizontal section in a horizontal tangent manner, and the end point of the horizontal section is connected to the starting point of the groove middle section in a horizontal manner.

6. The corrugated power cell liquid cooling plate of claim 5, wherein, First to sixth grooves are arranged on the stamping plate in the width direction in sequence, forming seven flow channels.

7. The corrugated power cell liquid cooling plate of claim 6, wherein, The distance between two adjacent grooves is 35-60 mm.

8. The corrugated power cell liquid cooling plate of claim 4, wherein, The groove width is 6-10 mm.

9. The corrugated power cell liquid cooling plate of claim 4, wherein, The corrugated power battery liquid cooling plate member, the heat-conducting pad and the battery module are included in the corrugated power battery liquid cooling plate member according to any one of claims 1-9, and the bottom plate of the battery liquid cooling plate member is connected to the battery module through the heat-conducting pad.

10. A power pack characterized by, ​

Images