Battery Pack Material Selection Method and Device

Abstract

This application relates to the technical field of battery management, and particularly to a method and device for selecting battery pack materials. A method for selecting battery pack materials includes: pre-building a battery pack assembly model, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a thermal insulation layer, and a box body; configuring material parameters for the heat dissipation layer and the thermal insulation layer respectively, and simulating the application of a pre-tightening force to the battery module; in the scenario of simulating the application of the pre-tightening force, adjusting the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions; determining the target material selection parameters of the heat dissipation layer and the thermal insulation layer according to the material parameters when both the heat dissipation layer and the thermal insulation layer meet the crushing conditions and heat conduction conditions. The embodiments of the present invention complete the selection of material parameters for the heat dissipation layer and the thermal insulation layer of each grade, which is beneficial to the thermal design and cost reduction of the battery pack.

Description

Technical Field

[0001] This application relates to the technical field of battery management, and in particular, to a method and device for selecting battery pack materials.

Background Art

[0002] In the existing solutions, after the battery pack assembly is completed, it is impossible to accurately know the specific performance parameters of the thermal insulation layer under the liquid cooling plate and the heat dissipation layer under the battery module after compression, so it is impossible to accurately evaluate the thermal performance of the battery pack. After being subjected to the pre-tightening force of the battery module, the compression amounts of the heat dissipation layer and the thermal insulation layer will be different due to their different compressible performances, and at the same time, it is impossible to accurately obtain parameters such as the thermal conductivity of the heat dissipation layer and the thermal insulation layer after compression, resulting in inaccurate selection of heat dissipation and thermal insulation materials, which is not conducive to the thermal design and cost reduction of the battery pack.

Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method and device for selecting battery pack materials to achieve the most accurate selection of material parameters of the heat dissipation layer and the thermal insulation layer in the battery pack assembly model, and specifically quantify parameters such as thermal conductivity.

[0004] In a first aspect, this embodiment provides a method for selecting battery pack materials, which is applied to a battery pack material selection system and includes:

[0005] Build a battery pack assembly model in advance, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a thermal insulation layer, and a box body. Among them, the model parameters of the battery module, the liquid cooling plate, and the box body are fixed values, and the material parameters of the heat dissipation layer and the thermal insulation layer are variable values;

[0006] Configure material parameters for the heat dissipation layer and the thermal insulation layer respectively, and simulate the application of a pre-tightening force to the battery module, where the simulated pre-tightening force is sequentially and downwardly simulated and transmitted through the battery module until it is simulated and transmitted to the box body;

[0007] Under the scenario of simulating the application of the pre-tightening force, adjust the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and thermal conductivity conditions;

[0008] Determine the target material selection parameters of the heat dissipation layer and the thermal insulation layer according to the material parameters when the heat dissipation layer and the thermal insulation layer both meet the crushing conditions and the thermal conductivity conditions.

[0009] Optionally, the material parameters respectively configured for the heat dissipation layer and the thermal insulation layer include: the initial thickness, initial area, compression stiffness curve, test thermal resistance table, and damping of the heat dissipation layer and the thermal insulation layer.

[0010] Optionally, adjust the material parameters of the heat dissipation layer and the heat insulation layer until the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions, including:

[0011] Adjust the areas of the heat dissipation layer and the heat insulation layer respectively, so that the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions;

[0012] When the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, determine whether the heat dissipation layer and the heat insulation layer respectively meet their corresponding heat conduction conditions;

[0013] If the heat dissipation layer and the heat insulation layer respectively meet their corresponding heat conduction conditions, stop adjusting the heat dissipation layer and the heat insulation layer;

[0014] If the heat dissipation layer and / or the heat insulation layer do not meet their corresponding heat conduction conditions, adjust the thickness of the heat dissipation layer and / or the heat insulation layer, and after adjusting the thickness of the heat dissipation layer and / or the heat insulation layer, jump back to the step of judging whether the crushing conditions are met again.

[0015] Optionally, the adjusting the areas of the heat dissipation layer and the heat insulation layer respectively, so that the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, includes:

[0016] When the areas of the heat dissipation layer and the heat insulation layer are respectively adjusted to the first area and the second area, the thicknesses of the heat dissipation layer and the heat insulation layer after being compressed by the pre-tightening force are the first thickness and the second thickness respectively;

[0017] If the first thickness and the second thickness are respectively greater than their corresponding crushing thicknesses, determine that the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions;

[0018] If the first thickness and / or the second thickness is less than or equal to their corresponding crushing thicknesses, adjust the area of the corresponding layer until the thickness of the corresponding layer after compression meets the crushing condition.

[0019] Optionally, the when the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, determining whether the heat dissipation layer and the heat insulation layer respectively meet their corresponding heat conduction conditions, includes:

[0020] According to the areas, thicknesses and their respective compression stiffness curves when the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, calculate the heat dissipation layer compression ratio and the heat insulation layer compression ratio respectively;

[0021] According to the heat dissipation layer compression ratio and the heat insulation layer compression ratio, determine the heat dissipation layer thermal conductivity and the heat insulation layer thermal conductivity respectively;

[0022] If the thermal conductivity of the heat dissipation layer is less than the first target thermal conductivity, the heat dissipation layer meets the corresponding thermal conductivity condition;

[0023] If the thermal conductivity of the heat insulation layer is greater than the second target thermal conductivity, the heat insulation layer meets the corresponding thermal conductivity condition.

[0024] Optionally, determining the thermal conductivity of the heat dissipation layer and the thermal conductivity of the heat insulation layer according to the compression ratio of the heat dissipation layer and the compression ratio of the heat insulation layer respectively includes:

[0025] Performing interpolation calculation on the test thermal resistance table of the heat dissipation layer according to the compression ratio of the heat dissipation layer to obtain the thermal conductivity of the heat dissipation layer;

[0026] Performing interpolation calculation on the test thermal resistance table of the heat insulation layer according to the compression ratio of the heat insulation layer to obtain the thermal conductivity of the heat insulation layer.

[0027] Optionally, if the heat dissipation layer and / or the heat insulation layer do not meet their respective corresponding thermal conductivity conditions, adjusting the thickness of the heat dissipation layer and / or the heat insulation layer includes:

[0028] If the thermal conductivity of the heat dissipation layer is greater than or equal to the first target thermal conductivity, the heat dissipation layer does not meet the corresponding thermal conductivity condition. After reducing the thickness of the heat dissipation layer, jump to the step of determining whether the heat dissipation layer meets the crushing condition;

[0029] If the thermal conductivity of the heat insulation layer is less than or equal to the second target thermal conductivity, the heat insulation layer does not meet the corresponding thermal conductivity condition. After increasing the thickness of the heat insulation layer, jump to the step of determining whether the heat insulation layer meets the crushing condition.

[0030] Optionally, determining the area, thickness, and thermal conductivity when the heat dissipation layer and the heat insulation layer meet the crushing condition and the thermal conductivity condition as the target material selection parameters of the heat dissipation layer and the heat insulation layer.

[0031] In a second aspect, this embodiment provides a device for selecting battery pack materials, including:

[0032] A building module that pre-builds a battery pack assembly model, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a heat insulation layer, and a box body. Among them, the model parameters of the battery module, the liquid cooling plate, and the box body are fixed values, and the material parameters of the heat dissipation layer and the heat insulation layer are variable values;

[0033] A configuration module that configures material parameters for the heat dissipation layer and the heat insulation layer respectively, and applies a pre-tightening force to the battery module in simulation, where the pre-tightening force applied in simulation is sequentially transmitted downward through the battery module until it is transmitted to the box body in simulation;

[0034] An adjustment module, in a scenario of simulating the application of the pre-tightening force, adjusts the material parameters of the heat dissipation layer and the heat insulation layer until the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions;

[0035] A determination module, based on the material parameters when both the heat dissipation layer and the heat insulation layer meet the crushing conditions and the heat conduction conditions, determines the target material selection parameters of the heat dissipation layer and the heat insulation layer.

[0036] In a third aspect, this embodiment provides a battery pack material selection device, including:

[0037] At least one processor; and

[0038] At least one memory communicatively connected to the processor, wherein:

[0039] The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of the first aspect by invoking the program instructions.

[0040] By the above method, through the judgment of the compression condition and the heat conduction condition respectively, the selection of the best material parameters for the heat dissipation layer and the heat insulation layer of each grade is completed, and parameters such as the thermal conductivity are specifically quantified, which is beneficial to the thermal design and cost reduction of the battery pack.

Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 It is a schematic structural diagram of a battery pack material selection system provided by an embodiment of the present invention;

[0043] Figure 2 It is a flowchart of a battery pack material selection method provided by an embodiment of the present invention;

[0044] Figure 3 It is a flowchart of another battery pack material selection method provided by an embodiment of the present invention;

[0045] Figure 4 It is a flowchart of another battery pack material selection method provided by an embodiment of the present invention;

[0046] Figure 5 It is a schematic structural diagram of a battery pack material selection device provided by an embodiment of the present invention;

[0047] Figure 6 The structural schematic diagram of an electronic device provided by an embodiment of the present invention.

Specific Embodiment

[0048] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0050] As Figure 1 shown, a battery pack material selection system provided by an embodiment of the present invention, the material selection system specifically includes: a battery pack assembly model 101, a condition judgment model 102, and an output model 103.

[0051] The battery pack assembly model 101 is composed of a battery module, a heat dissipation layer, a liquid cooling plate, a heat preservation layer, and a lower box body from top to bottom. Among them, a pre-tightening force is simulated on the battery module in the battery pack assembly model 101, and the pre-tightening force is sequentially simulated and transmitted downward through the battery module until it is simulated and transmitted to the lower box body. Among them, both the liquid cooling plate and the box body are rigid bodies and will not be compressed under the pre-tightening force of the battery module, while the heat dissipation layer and the heat preservation layer will be compressed under the pre-tightening force of the battery module. Usually, the heat dissipation layer is a thermal conductive pad, and the heat preservation layer is a supporting foam.

[0052] The condition judgment model 102 is used to determine whether the material parameters of the heat dissipation layer and the heat preservation layer meet the crushing condition and the heat conduction condition. When the heat dissipation layer and the heat preservation layer do not simultaneously meet the crushing condition and the heat conduction condition, it is necessary to adjust the respective material parameters of the heat dissipation layer and the heat preservation layer in the battery pack assembly model 101 to make them meet the crushing condition and the heat conduction condition. Only when the heat dissipation layer and the heat preservation layer simultaneously meet the crushing condition and the heat conduction condition, the material selection system will output the corresponding target material selection parameters.

[0053] Specifically, the crushing condition includes that the thicknesses of the heat dissipation layer and the heat preservation layer after being compressed by the pre-tightening force of the battery module are respectively greater than their corresponding crushing thicknesses. The heat conduction conditions respectively include that the thermal conductivity of the heat dissipation layer after being compressed by the pre-tightening force of the battery module is less than the first target thermal conductivity; the thermal conductivity of the heat preservation layer after being compressed by the pre-tightening force of the battery module is greater than the second target thermal conductivity.

[0054] When the heat dissipation layer and / or the heat preservation layer do not simultaneously meet their respective corresponding crushing conditions and heat conduction conditions, it is necessary to adjust the area and thickness in the material parameters of the heat dissipation layer and / or the heat preservation layer respectively to make them meet the crushing condition and the heat conduction condition respectively.

[0055] Specifically, in the initial state, an initial area and an initial thickness are set for the heat dissipation layer and the heat insulation layer. The heat dissipation layer and the heat insulation layer will generate a compression amount under the pre-tightening force of the battery module, and it is determined whether the heat dissipation layer and the heat insulation layer meet the crushing conditions according to the compression amount. If their respective compressed thicknesses are greater than their respective corresponding crushing thicknesses, the heat dissipation layer and the heat insulation layer meet their respective corresponding crushing conditions; if the compressed thickness of the heat dissipation layer and / or the heat insulation layer is less than or equal to their respective corresponding crushing thicknesses, it is necessary to adjust their areas, and the areas of the heat dissipation layer and the heat insulation layer are respectively adjusted to a first area and a second area. At this time, their respective thicknesses compressed by the pre-tightening force are the first thickness and the second thickness. It is determined again whether the first area of the heat dissipation layer and the second area of the heat insulation layer meet the crushing conditions. If the first thickness and the second thickness are respectively greater than their respective corresponding crushing thicknesses, it is determined that the heat dissipation layer and the heat insulation layer meet their respective corresponding crushing conditions. If they still do not meet the conditions, continue to adjust the area until the crushing conditions are met.

[0056] In some embodiments, after the heat dissipation layer and the heat insulation layer both meet the crushing conditions, the heat dissipation layer compression rate and the heat insulation layer compression rate at the area when they meet the crushing conditions can be respectively determined according to the compression stiffness curve and the initial thickness in the material parameters of the heat dissipation layer and the heat insulation layer, and the heat dissipation layer thermal conductivity and the heat insulation layer thermal conductivity are determined according to the heat dissipation layer compression rate and the heat insulation layer compression rate.

[0057] It is determined whether they meet their respective heat conduction conditions according to the heat dissipation layer thermal conductivity of the heat dissipation layer and the heat insulation layer thermal conductivity of the heat insulation layer. If the heat dissipation layer thermal conductivity is greater than its corresponding first target thermal conductivity, the initial thickness of the heat dissipation layer is reduced, and then it jumps to the step of determining whether the heat dissipation layer meets the crushing conditions, and re-judges the crushing conditions and the heat conduction conditions; if the heat insulation layer thermal conductivity is less than its corresponding second target thermal conductivity, the thickness of the heat insulation layer is increased, and then it jumps to the step of determining whether the heat insulation layer meets the crushing conditions, and re-judges the crushing conditions and the heat conduction conditions.

[0058] The heat dissipation layer and the heat insulation layer with adjusted thicknesses need to re-adjust their respective areas according to the crushing conditions, and re-determine the areas and thicknesses that meet the crushing conditions. After meeting the crushing conditions, it is determined again whether the heat dissipation layer and the heat insulation layer meet the heat conduction conditions. If they still do not meet the heat conduction conditions, continue to adjust their thicknesses until both the crushing conditions and the heat conduction conditions are met.

[0059] The output model 103 is used to output the grades and various material parameters of the heat dissipation layer and the heat insulation layer adjusted by the condition judgment model, that is, the areas, the compressed thicknesses, and the thermal conductivities when the heat dissipation layer and the heat insulation layer under the selected grade meet the crushing conditions and the heat conduction conditions.

[0060] Combined with Figure 1The material selection system shown, an embodiment of the present invention provides a material selection method. Based on this method, it is possible to output the material parameters of the heat dissipation layer and the thermal insulation layer. As Figure 2 shown, the processing steps of this method include:

[0061] 201. First, build a battery pack assembly model, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a thermal insulation layer, and a box body. Among them, the model parameters of the battery module, the liquid cooling plate, and the box body are fixed values, and the material parameters of the heat dissipation layer and the thermal insulation layer are variable values.

[0062] Specifically, the battery module will apply a pre-tightening force to other components below, providing excitation for the entire battery pack assembly model; the liquid cooling plate is used to separate the heat dissipation layer and the thermal insulation layer; the box body serves as a fixed end to support the entire battery pack assembly model, and the battery module, the liquid cooling plate, and the box body are all assumed to be rigid bodies and will not generate compression and displacement under the pre-tightening force of the battery module. While the heat dissipation material and the thermal insulation material are both assumed to be compressible elastic bodies and will be compressed under the pre-tightening force of the battery module.

[0063] 202. Configure material parameters for the heat dissipation layer and the thermal insulation layer respectively, and simulate the application of the pre-tightening force through the battery module. Among them, the pre-tightening force applied by simulation is sequentially simulated and transmitted downward through the battery module until it is simulated and transmitted to the box body.

[0064] Specifically, the physical properties of the heat dissipation layer and the thermal insulation layer of each brand are different, and different material parameters will change the heat conduction performance of the heat dissipation layer and the thermal insulation layer. Therefore, it is necessary to determine the initial thickness, initial area, compression stiffness curve, test thermal resistance table, and damping of different brands of heat dissipation layers and thermal insulation layers respectively.

[0065] Place the heat dissipation layer and the thermal insulation layer with pre-configured material parameters in the corresponding positions of the battery pack assembly model. The pre-tightening force simulated by the battery module will compress the heat dissipation layer and the thermal insulation layer, thereby generating a compression amount.

[0066] 203. Under the scenario of simulating the application of the pre-tightening force, adjust the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions.

[0067] Specifically, adjust the areas of the heat dissipation layer and the thermal insulation layer respectively so that the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions.

[0068] When the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions, determine whether the heat dissipation layer and the thermal insulation layer respectively meet their corresponding heat conduction conditions.

[0069] If the heat dissipation layer and the heat insulation layer respectively meet their corresponding heat conduction conditions, stop adjusting the heat dissipation layer and the heat insulation layer.

[0070] If the heat dissipation layer and / or the heat insulation layer do not meet their corresponding heat conduction conditions, adjust the thickness of the heat dissipation layer and / or the heat insulation layer, and after adjusting the thickness of the heat dissipation layer and / or the heat insulation layer, jump back to the step of determining whether the crushing condition is met again.

[0071] Among them, if the thickness of the heat dissipation layer and the heat insulation layer after being compressed by the pre-tightening force of the battery module is greater than their respective corresponding crushing thicknesses, it is determined that they respectively meet their corresponding crushing conditions; if the heat conduction rate of the heat dissipation layer is less than its corresponding first target heat conduction rate and the heat conduction rate of the heat insulation layer is greater than its corresponding second target heat conduction rate, it is determined that they respectively meet their corresponding heat conduction conditions.

[0072] 204. Determine the target material selection parameters of the heat dissipation layer and the heat insulation layer according to the material parameters when the heat dissipation layer and the heat insulation layer both meet the crushing conditions and the heat conduction conditions.

[0073] Specifically, when the heat dissipation layer and the heat insulation layer simultaneously meet the crushing conditions and the heat conduction conditions, determine the adjusted parameters at this time as the target material selection parameters, and output the target material selection parameters, including the compressed thickness, the compressed heat conduction rate, and the adjusted area.

[0074] By respectively judging the compression condition and the heat conduction condition in the embodiments of the present invention, the selection of the material parameters of the heat dissipation layer and the heat insulation layer of each grade is completed, which is beneficial to the thermal design and cost reduction of the battery pack.

[0075] In step 203, when the heat dissipation layer and / or the heat insulation layer do not meet the crushing conditions and the heat conduction conditions, it is necessary to adjust the area and thickness of the heat dissipation layer and / or the heat insulation layer in the battery pack assembly model so that the heat dissipation layer and / or the heat insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions. However, the heat dissipation layer and the heat insulation layer often need to be adjusted separately for parameters.

[0076] In the embodiments of the present invention, by adjusting the area and thickness of the heat dissipation layer, the heat dissipation layer obtains the most suitable material parameters of the heat insulation layer under each grade while achieving the optimal thermal performance. As Figure 3 shown, a specific method for adjusting the material parameters of the heat dissipation layer is as follows, and its steps specifically include:

[0077] 301. Configure material parameters for the heat dissipation layer and simulate the application of pre-tightening force through the battery module.

[0078] Specifically, select the grade of the heat dissipation layer, and determine the initial thickness, initial area, compression stiffness curve, test thermal resistance table, and damping of the heat dissipation layer under this grade. Among them, the compression stiffness curve, test thermal resistance table, and damping of the heat dissipation layer are determined by the physical properties of the heat dissipation layer and generally do not change. Therefore, it is necessary to adjust the initial thickness and initial area of the heat dissipation layer to make the heat dissipation layer reach the optimal size under this grade.

[0079] 302. Under the scenario of simulating the application of the pre-tightening force, determine whether the heat dissipation layer meets the crushing condition.

[0080] Specifically, if the first thickness of the heat dissipation layer after compression is greater than the crushing thickness corresponding to the heat dissipation layer, that is, no crushing occurs, it is determined that the heat dissipation layer meets its corresponding crushing condition, and jump to step 303.

[0081] If the first thickness of the heat dissipation layer after compression is less than or equal to the crushing thickness corresponding to the heat dissipation layer, that is, crushing occurs, it is determined that the heat dissipation layer does not meet its corresponding crushing condition, and jump to step 304.

[0082] 303. Determine the area and thickness of the heat dissipation layer when it meets the crushing condition.

[0083] When the heat dissipation layer meets the crushing condition, determine the first area and first thickness of the heat dissipation layer at this time as the area and thickness of the heat dissipation layer when it meets the crushing condition.

[0084] 304. Adjust the area of the heat dissipation layer.

[0085] Specifically, if the thickness of the heat dissipation layer after compression is less than the crushing thickness under the pre-tightening force of the battery module and crushing occurs, it is necessary to increase the area of the heat dissipation layer by one unit area, and re-determine whether it meets the crushing condition through the compression amount under the pre-tightening force of the battery module. If it still does not meet the crushing condition, increase the adjusted area by one unit area again, and jump to step 302 to re-determine whether it meets the crushing condition until the crushing condition is met.

[0086] The size of each increased unit area can be set by the user. The size of the unit area can be adjusted according to the thickness of the heat dissipation layer after the previous compression. For example, when the crushing phenomenon caused by the previous compression is obvious, the increased unit area can be appropriately increased. When the user does not adjust the unit area, it is usually set that the unit area increased each time is the same as the initial area.

[0087] 305. Determine the compression rate and thermal conductivity of the heat dissipation layer.

[0088] Specifically, according to the compression stiffness curve of the initially selected heat dissipation layer grade and the initially set initial thickness, determine the compression rate of the heat dissipation layer at the area when the heat dissipation layer meets the crushing condition.

[0089] Interpolate the test thermal resistance table of the heat dissipation layer through the compression rate of the heat dissipation layer to determine the thermal conductivity of the heat dissipation layer after compression.

[0090] 306, judge whether the heat dissipation layer meets the heat conduction condition according to the thermal conductivity of the heat dissipation layer.

[0091] Specifically, if the thermal conductivity of the heat dissipation layer is less than the first target thermal conductivity, the heat dissipation layer meets the heat conduction condition, and jump to step 307; otherwise, it does not meet the heat conduction condition, and jump to step 308.

[0092] The first target thermal conductivity of the heat dissipation layer can be set by the user according to different requirements, so that the heat dissipation layer meets the heat dissipation conditions in various specific scenarios.

[0093] 307, determine the thermal conductivity when the heat dissipation layer meets the heat conduction condition.

[0094] Specifically, when the heat dissipation layer meets the heat conduction condition, determine the thermal conductivity of the heat dissipation layer when the heat dissipation layer meets both the crushing condition and the heat conduction condition as the thermal conductivity when the heat dissipation layer meets the heat conduction condition.

[0095] 308, adjust the thickness of the heat dissipation layer.

[0096] Specifically, if the thermal conductivity of the heat dissipation layer is greater than the first target thermal conductivity, reduce the thickness of the heat dissipation layer, and jump back to step 302 to judge whether it meets the crushing condition again.

[0097] 309, output the material parameters when the heat dissipation layer meets the crushing condition and the heat conduction condition, and determine the target material selection parameters of the heat dissipation layer.

[0098] Specifically, when the heat dissipation layer meets both the crushing condition and the heat conduction condition, output the area, thickness, and thermal conductivity when the heat dissipation layer meets the crushing condition and the heat conduction condition, and the grade selected by the heat dissipation layer as the target material selection parameters.

[0099] The heat dissipation layer needs to increase the compression amount of the heat dissipation material to increase the thermal conductivity, improve the heat transfer efficiency between the module and the liquid cooling plate, and thus improve the heat dissipation performance of the battery pack. Through the screening of the crushing condition and the heat conduction condition, the embodiment of the present invention obtains the most suitable grade of the heat dissipation layer and the corresponding material parameters, and clearly quantifies the thermal conductivity of the heat dissipation layer and its crushing risk, so that the thermal performance of the battery pack reaches the optimal.

[0100] In the embodiments of the present invention, by adjusting the area and thickness of the thermal insulation layer, the thermal insulation layer obtains the most suitable material parameters for each grade while achieving the optimal thermal performance. For example, Figure 4 As shown, it is a specific method for adjusting the material parameters of the thermal insulation layer, and its steps specifically include:

[0101] 401, Configure material parameters for the thermal insulation layer and simulate the application of a pre-tightening force through the battery module

[0102] Specifically, select the grade of the thermal insulation layer and determine the initial thickness, initial area, compression stiffness curve, test thermal resistance table, and damping of the thermal insulation layer under this grade. Among them, the compression stiffness curve, test thermal resistance table, and damping of the thermal insulation layer are determined by the physical properties of the thermal insulation layer and generally do not change. Therefore, it is necessary to adjust the initial thickness and initial area of the thermal insulation layer to make the thermal insulation layer reach the best size under this grade.

[0103] 402, Judge whether the thermal insulation layer meets the crushing condition in the scenario of simulating the application of the pre-tightening force.

[0104] Specifically, if the thickness of the thermal insulation layer after compression is greater than the crushing thickness corresponding to the thermal insulation layer, that is, no crushing occurs, it is determined that the thermal insulation layer meets its corresponding crushing condition, and jump to step 403.

[0105] If the thickness of the thermal insulation layer after compression is less than or equal to the crushing thickness corresponding to the thermal insulation layer, that is, crushing occurs, it is determined that the thermal insulation layer does not meet its corresponding crushing condition, and jump to step 404.

[0106] 403, Determine the area and thickness of the thermal insulation layer when it meets the crushing condition.

[0107] When the thermal insulation layer meets the crushing condition, determine the second area and second thickness of the thermal insulation layer at this time as the area and thickness when the heat dissipation layer meets the crushing condition.

[0108] 404, Adjust the area of the thermal insulation layer.

[0109] Specifically, if the thickness of the thermal insulation layer after compression is less than the crushing thickness under the pre-tightening force of the battery module and crushing occurs, it is necessary to increase the initial area of the thermal insulation layer by one unit area, and re-judge whether it meets the crushing condition through the compression amount under the pre-tightening force of the battery module. If it still does not meet the crushing condition, increase the adjusted area by one unit area again, and jump to step 402 to re-judge whether it meets the crushing condition until the crushing condition is met.

[0110] Among them, the unit area increased each time can be set by the user himself. The size of the unit area can be adjusted according to the thickness after the previous compression of the thermal insulation layer. For example, when the crushing phenomenon caused by the previous compression is obvious, the increased unit area can be appropriately increased. When the user does not adjust the unit area, the unit area increased each time is usually set to be the same as the initial area.

[0111] 405. Determine the compression rate and thermal conductivity of the thermal insulation layer of the thermal insulation layer.

[0112] Specifically, according to the compression stiffness curve of the thermal insulation layer grade initially selected and the initially set initial thickness, determine the compression rate of the thermal insulation layer under the area when the thermal insulation layer meets the crushing condition.

[0113] Interpolate the test thermal resistance table of the thermal insulation layer through the compression rate of the thermal insulation layer of the thermal insulation layer to determine the thermal conductivity of the thermal insulation layer after compression.

[0114] 406. Judge whether the thermal insulation layer meets the thermal conductivity condition according to the thermal conductivity of the thermal insulation layer.

[0115] Specifically, if the thermal conductivity of the thermal insulation layer of the thermal insulation layer is greater than the second target thermal conductivity, the thermal insulation layer meets the thermal conductivity condition and jumps to step 407; otherwise, it does not meet the thermal conductivity condition and jumps to step 408.

[0116] Among them, the second target thermal conductivity of the thermal insulation layer can be set by the user himself under different requirements, so that the thermal insulation layer meets the thermal conductivity conditions in various specific scenarios.

[0117] 407. Determine the thermal conductivity when the thermal insulation layer meets the thermal conductivity condition.

[0118] Specifically, when the thermal insulation layer meets the thermal conductivity condition, determine the thermal conductivity of the thermal insulation layer when the thermal insulation layer meets both the crushing condition and the thermal conductivity condition at this time as the thermal conductivity when the thermal insulation layer meets the thermal conductivity condition.

[0119] 408. Adjust the thickness of the thermal insulation layer.

[0120] If the thermal conductivity of the thermal insulation layer of the thermal insulation layer is less than the second target thermal conductivity, increase the initial thickness of the thermal insulation layer and jump back to step 402 to judge whether it meets the crushing condition again.

[0121] 409. Output the material parameters when the thermal insulation layer meets the crushing condition and the thermal conductivity condition, and determine the target material selection parameters of the thermal insulation layer.

[0122] Specifically, when the thermal insulation layer meets both the crushing condition and the thermal conductivity condition, output the area, thickness, and thermal conductivity when the thermal insulation layer meets the crushing condition and the thermal conductivity condition, and the grade selected for the heat dissipation layer as the target material selection parameters.

[0123] The thermal insulation layer requires a small compression amount to maximize the thermal resistance, reduce heat transfer between the liquid cooling plate and the lower box body, and thus improve the thermal insulation performance of the battery pack. Through the screening of the crushing condition and the thermal conductivity condition, the embodiments of the present invention obtain the most suitable grade of the thermal insulation layer and the corresponding material parameters, and clearly quantify the thermal conductivity of the thermal insulation layer and its crushing risk, so as to optimize the thermal performance of the battery pack.

[0124] Corresponding to the above-mentioned method for selecting materials for the battery pack, the embodiments of the present invention also provide a device for selecting materials for the battery pack. Refer to Figure 5 As shown in the figure, the device for selecting materials for the battery pack may include: a building module 501, a configuration module 502, an adjustment module 503, and a determination module 504.

[0125] The building module 501 pre-builds a battery pack assembly model, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a thermal insulation layer, and a box body. Among them, the model parameters of the battery module, the liquid cooling plate, and the box body are fixed values, and the material parameters of the heat dissipation layer and the thermal insulation layer are variable values.

[0126] The configuration module 502 configures material parameters for the heat dissipation layer and the thermal insulation layer respectively, and applies a pre-tightening force to the battery module in simulation, where the pre-tightening force applied in simulation is sequentially simulated and transmitted downward through the battery module until it is simulated and transmitted to the box body.

[0127] The adjustment module 503 adjusts the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and thermal conductivity conditions in the scenario of applying the pre-tightening force in simulation.

[0128] The determination module 504 determines the target material selection parameters of the heat dissipation layer and the thermal insulation layer according to the material parameters when both the heat dissipation layer and the thermal insulation layer meet the crushing conditions and the thermal conductivity conditions.

[0129] Figure 6 This is a schematic structural diagram of an embodiment of an electronic device in this specification. As Figure 6 shown, the above-mentioned electronic device may include at least one processor; and at least one memory communicatively connected to the above-mentioned processor, where: the memory stores program instructions executable by the processor, and the above-mentioned processor can execute the method for selecting materials for the battery pack provided in this embodiment by calling the above-mentioned program instructions.

[0130] Among them, the above-mentioned electronic device may be a device capable of having an intelligent conversation with a user, for example: a cloud server. The embodiments of this specification do not limit the specific form of the above-mentioned electronic device. It can be understood that the electronic device here is the machine mentioned in the method embodiment.

[0131] Figure 6 A block diagram of an exemplary electronic device suitable for implementing the embodiments of the present specification is shown. Figure 6 The electronic device shown is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present specification.

[0132] As Figure 6 shown, the electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 610, a communication interface 620, a memory 630, and a communication bus 640 connecting different system components (including the memory 630, the communication interface 620, and the processing unit 610).

[0133] The communication bus 640 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus structures. For example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnection (PCI) bus.

[0134] The electronic device typically includes a variety of computer system-readable media. These media can be any available media accessible by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0135] The memory 630 may include computer system-readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 630 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present specification.

[0136] A program / util utility having a set (at least one) of program modules can be stored in the memory 630. Such program modules include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment. The program modules generally perform the functions and / or methods in the embodiments described in this specification.

[0137] The processor 610 executes various functional applications and data processing by running the programs stored in the memory 630, such as implementing the material selection method of the battery pack provided by the embodiments shown in this specification.

[0138] The embodiments of this specification provide a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the material selection method of the battery pack provided by the embodiments shown in this specification.

[0139] The above non-transitory computer-readable storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (hereinafter referred to as: ROM), an erasable programmable read-only memory (hereinafter referred to as: EPROM), or a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device.

[0140] The computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which the computer-readable program code is carried. Such a propagated data signal can take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and this computer-readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device.

[0141] The program code contained on a computer-readable medium can be transmitted with any appropriate medium, including - but not limited to - wireless, wire, optical fiber cable, RF, etc., or any suitable combination of the above.

[0142] The computer program code for performing the operations of this specification can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages - such as Java, Smalltalk, C++, and also include conventional procedural programming languages - such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a Local Area Network (LAN) or a Wide Area Network (WAN), or, can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0143] The above has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be executed in a different order from that in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require the specific order or consecutive order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0144] Furthermore, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0145] Any process or method description in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of this specification includes additional implementations, where the functions can be executed in a way that is not in the order shown or discussed, including in a substantially simultaneous manner or in the reverse order according to the functions involved, which should be understood by those skilled in the technical field to which the embodiments of this specification belong.

[0146] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0147] It should be noted that the terminals involved in the embodiments of this specification may include, but are not limited to, personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0148] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0149] In addition, each functional unit in the various embodiments of this specification can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0150] The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units stored in a storage medium include several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (Processor) to execute some steps of the methods described in the various embodiments of this specification.

[0151] The above are only the preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification shall be included within the scope of protection of this specification.

Claims

1. A method for selecting materials for a battery pack, characterized in that, the method is applied to a battery pack material selection system, including: Pre-build a battery pack assembly model, which successively includes: a battery module, a heat dissipation layer, a liquid cooling plate, a thermal insulation layer, and a box body. Among them, the model parameters of the battery module, the liquid cooling plate, and the box body are fixed values, and the material parameters of the heat dissipation layer and the thermal insulation layer are variable values; Configure material parameters for the heat dissipation layer and the thermal insulation layer respectively, and simulate applying a pre-tightening force to the battery module, where the simulated pre-tightening force is sequentially and downwardly simulated and transmitted through the battery module until it is simulated and transmitted to the box body; Under the scenario of simulating the application of the pre-tightening force, adjust the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions; According to the material parameters when both the heat dissipation layer and the thermal insulation layer meet the crushing conditions and the heat conduction conditions, determine the target material selection parameters of the heat dissipation layer and the thermal insulation layer; Among them, the material parameters of the heat dissipation layer and the thermal insulation layer include: different grades of the heat dissipation layer and the thermal insulation layer; The adjusting the material parameters of the heat dissipation layer and the thermal insulation layer under the scenario of simulating the application of the pre-tightening force until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions includes: By respectively judging the compression condition and the heat conduction condition, to determine whether the heat dissipation layer and the thermal insulation layer of each grade meet their corresponding crushing conditions and heat conduction conditions.

2. The method according to claim 1, characterized in that, The material parameters respectively configured for the heat dissipation layer and the thermal insulation layer include: the initial thickness, the initial area, the compression stiffness curve, the test thermal resistance table, and the damping of the heat dissipation layer and the thermal insulation layer.

3. The method according to claim 1 or 2, characterized in that, Adjusting the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions includes: Respectively adjust the areas of the heat dissipation layer and the thermal insulation layer so that the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions; When the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions, determine whether the heat dissipation layer and the thermal insulation layer respectively meet their corresponding heat conduction conditions; If the heat dissipation layer and the thermal insulation layer respectively meet their corresponding heat conduction conditions, stop adjusting the heat dissipation layer and the thermal insulation layer; If the heat dissipation layer and / or the thermal insulation layer do not meet their corresponding heat conduction conditions, adjust the thickness of the heat dissipation layer and / or the thermal insulation layer, and after adjusting the thickness of the heat dissipation layer and / or the thermal insulation layer, jump back to the step of judging whether the crushing conditions are met again.

4. The method according to claim 3, characterized in that, The respectively adjusting the areas of the heat dissipation layer and the thermal insulation layer so that the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions includes: When the areas of the heat dissipation layer and the heat insulation layer are respectively adjusted to a first area and a second area, the thicknesses of the heat dissipation layer and the heat insulation layer after being compressed by the pre-tightening force are a first thickness and a second thickness respectively; If the first thickness and the second thickness are respectively greater than their corresponding crushing thicknesses, it is determined that the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions; If the first thickness and / or the second thickness is less than or equal to their corresponding crushing thicknesses, the area of the corresponding layer is adjusted until the thickness of the corresponding layer after compression meets the crushing condition.

5. The method according to claim 3, wherein, when the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, determining whether the heat dissipation layer and the heat insulation layer respectively meet their corresponding heat conduction conditions includes: According to the areas, thicknesses and their respective compression stiffness curves when the heat dissipation layer and the heat insulation layer respectively meet their corresponding crushing conditions, calculating the heat dissipation layer compression rate and the heat insulation layer compression rate respectively; According to the heat dissipation layer compression rate and the heat insulation layer compression rate, determining the heat dissipation layer thermal conductivity and the heat insulation layer thermal conductivity respectively; If the heat dissipation layer thermal conductivity is less than a first target thermal conductivity, the heat dissipation layer meets its corresponding heat conduction condition; If the heat insulation layer thermal conductivity is greater than a second target thermal conductivity, the heat insulation layer meets its corresponding heat conduction condition.

6. The method according to claim 5, wherein, determining the heat dissipation layer thermal conductivity and the heat insulation layer thermal conductivity according to the heat dissipation layer compression rate and the heat insulation layer compression rate respectively includes: Performing interpolation calculation on the test thermal resistance table of the heat dissipation layer according to the heat dissipation layer compression rate to obtain the heat dissipation layer thermal conductivity; Performing interpolation calculation on the test thermal resistance table of the heat insulation layer according to the heat insulation layer compression rate to obtain the heat insulation layer thermal conductivity.

7. The method according to claim 5, wherein, if the heat dissipation layer and / or the heat insulation layer do not meet their corresponding heat conduction conditions, adjusting the thickness of the heat dissipation layer and / or the heat insulation layer includes: If the heat dissipation layer thermal conductivity is greater than or equal to the first target thermal conductivity, the heat dissipation layer does not meet its corresponding heat conduction condition, reduce the thickness of the heat dissipation layer and then jump to the step of judging whether the heat dissipation layer meets the crushing condition; If the heat insulation layer thermal conductivity is less than or equal to the second target thermal conductivity, the heat insulation layer does not meet its corresponding heat conduction condition, increase the thickness of the heat insulation layer and then jump to the step of judging whether the heat insulation layer meets the crushing condition.

8. The method according to claim 1, wherein, Determine the area, thickness and thermal conductivity when the heat dissipation layer and the heat insulation layer meet the crushing condition and the heat conduction condition as the target material selection parameters of the heat dissipation layer and the heat insulation layer.

9. A battery pack material selection device, wherein, comprising: Building module, pre-build the battery pack assembly model, which successively includes: battery modules, heat dissipation layer, liquid cooling plate, thermal insulation layer and box body, wherein the model parameters of the battery modules, the liquid cooling plate and the box body are fixed values, and the material parameters of the heat dissipation layer and the thermal insulation layer are variable values; Configuration module, configure material parameters for the heat dissipation layer and the thermal insulation layer respectively, and simulate applying a pre-tightening force to the battery modules, wherein the simulated pre-tightening force is sequentially and downwardly simulated and transmitted through the battery modules until it is simulated and transmitted to the box body; Adjustment module, in the scenario of simulating the application of the pre-tightening force, adjust the material parameters of the heat dissipation layer and the thermal insulation layer until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions; Determination module, according to the material parameters when both the heat dissipation layer and the thermal insulation layer meet the crushing conditions and the heat conduction conditions, determine the target material selection parameters of the heat dissipation layer and the thermal insulation layer; Wherein, the material parameters of the heat dissipation layer and the thermal insulation layer include: different grades of the heat dissipation layer and the thermal insulation layer; The adjusting the material parameters of the heat dissipation layer and the thermal insulation layer in the scenario of simulating the application of the pre-tightening force until the heat dissipation layer and the thermal insulation layer respectively meet their corresponding crushing conditions and heat conduction conditions includes: By respectively judging the compression condition and the heat conduction condition to determine whether the heat dissipation layer and the thermal insulation layer of each grade meet their corresponding crushing conditions and heat conduction conditions.

10. A battery pack material selection device, characterized in that, it includes: at least one processor; and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 8 by invoking the program instructions.

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