Battery pack sealing performance simulation evaluation method, electronic equipment and storage medium

Abstract

The invention discloses a battery pack sealing performance simulation evaluation method, electronic equipment and a storage medium, and the battery pack sealing performance simulation evaluation method comprises the steps: providing a simulation sealing gasket which is made of an elastic material, and obtaining mechanical property parameters and size parameters of the simulation sealing gasket; a battery pack model is constructed, the battery pack model comprises a box body, an upper cover, a simulation sealing gasket and bolts, the simulation sealing gasket is located between the box body and the upper cover, and the bolts are used for connecting the box body and the upper cover; endowing the mechanical properties and size parameters of the simulated sealing gasket into the battery pack model; establishing a battery pack pre-tightening force analysis working condition based on the model of the battery pack, loading a pre-tightening force to the bolt, and calculating whether the pre-tightening force of the bolt meets the mechanical requirement of the battery pack; and establishing a battery pack sealing analysis working condition based on the model of the battery pack, loading pressure on the upper cover, and calculating whether the gap between the upper cover and the box body meets the sealing requirement of the battery pack or not.

Description

Technical Field

[0001] This application belongs to the field of battery pack technology, and particularly relates to battery pack sealing performance simulation evaluation methods, electronic devices, and storage media. Background Technology

[0002] The battery pack consists of a top cover, a housing, and a sealing gasket. The battery pack achieves its seal through the compression of the sealing gasket. However, under extreme conditions such as thermal runaway, the gas released from the battery pack can impact the top cover, causing it to deform and creating a gap between the top cover and the housing. Due to the resilience of the sealing gasket, the battery pack's seal can be maintained as long as the gap remains within a certain range.

[0003] When performing sealing simulations on battery packs, the constitutive model parameters of the rubber gasket, a hyperelastic material, are difficult to obtain due to the gasket's large deformation during the simulation. Furthermore, the large deformation during the simulation makes convergence difficult. While achieving convergence requires parameter control such as contact control and adaptive meshing, this significantly impacts the accuracy of the gasket compression and rebound simulations, making it challenging to simulate the sealing performance of battery packs. Summary of the Invention

[0004] This application provides a battery pack sealing performance simulation evaluation method, which can simulate whether the battery pack seal fails when the top cover deforms.

[0005] This application provides a battery pack sealing performance simulation evaluation method, including: providing a simulated sealing gasket, the simulated sealing gasket being an elastic material, and obtaining the mechanical performance parameters and dimensional parameters of the simulated sealing gasket; constructing a battery pack model, the battery pack model including a housing, a top cover, a simulated sealing gasket, and bolts, the simulated sealing gasket being located between the housing and the top cover, and the bolts being used to connect the housing and the top cover; assigning the mechanical performance and dimensional parameters of the simulated sealing gasket to the battery pack model; creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack; creating a battery pack sealing analysis condition based on the battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

[0006] According to the first aspect of this application, before the steps of creating a battery pack preload analysis working condition based on a battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack, the method further includes: providing an actual sealing gasket, wherein the actual sealing gasket is a hyperelastic material, and obtaining the mechanical performance parameters and dimensional parameters of the actual sealing gasket.

[0007] According to the first aspect of this application, after creating a battery pack preload analysis working condition based on a battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack, the method further includes: calculating whether the preload of the bolts will crush the actual sealing gasket.

[0008] According to the first aspect of this application, the steps of creating a battery pack sealing analysis condition based on a battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack include: creating a battery pack sealing analysis condition based on a battery pack model, applying pressure to the top cover; measuring the gap between the top cover and the housing after deformation; and comparing the gap with the maximum rebound size of the actual sealing gasket.

[0009] According to the first aspect of this application, the step of comparing the gap with the maximum rebound size of the actual sealing gasket is: comparing the gap with the maximum rebound size of the actual sealing gasket under preload.

[0010] According to the embodiments of the first aspect of this application, the mechanical performance parameters of the actual sealing gasket include: the compression-rebound nonlinear curve of the actual sealing gasket, wherein the compression-rebound nonlinear curve is the correspondence between the pressure and the rebound deformation size of the actual sealing gasket under a set size.

[0011] According to the first aspect of this application, the mechanical performance parameters of the simulated sealing gasket include: the compression-rebound linear curve of the simulated sealing gasket, wherein the compression-rebound linear curve is the correspondence between the pressure and the rebound deformation size of the simulated sealing gasket under a set size.

[0012] On the other hand, embodiments of this application also provide an electronic device, including a memory and a processor, wherein the processor is used to execute a computer management program stored in the memory to implement the steps of the battery pack sealing simulation evaluation method as described above.

[0013] On the other hand, embodiments of this application also provide a computer-readable storage medium storing a computer management program thereon, which, when executed by a processor, implements the steps of the battery pack sealing simulation evaluation method as described above.

[0014] The battery pack sealing performance simulation evaluation method of this application includes providing a simulated sealing gasket, constructing a battery pack model, assigning the mechanical properties and dimensional parameters of the simulated sealing gasket to the battery pack model, creating a battery pack preload analysis condition based on the battery pack model, and creating a battery pack sealing analysis condition based on the battery pack model. By using a simulated sealing gasket made of elastic material instead of the actual sealing gasket made of hyperelastic material, the mechanical property parameters of the simulated sealing gasket conform to a linear relationship, which greatly reduces the difficulty of constructing the battery pack model, thereby enabling the battery pack to simulate whether the battery pack seal fails when the top cover deforms. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is one of the flowcharts of the battery pack sealing performance simulation evaluation method according to some embodiments of this application;

[0017] Figure 2 The second flowchart illustrates an example of a battery pack sealing performance simulation evaluation method.

[0018] Figure 3 The third flowchart illustrates an example of a battery pack sealing performance simulation evaluation method. Detailed Implementation

[0019] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0021] The applicant found that in the prior art, because the sealing gasket is a rubber gasket, which is a hyperelastic, it is difficult to obtain the constitutive model parameters of its material. Furthermore, the deformation is large during the simulation process, making convergence difficult. In order to achieve convergence, the relevant contact control, adaptive mesh and other parameter control will have a significant impact on the accuracy of the compression and rebound simulation of the sealing gasket, making it difficult to realize the sealing performance simulation of the battery pack.

[0022] In view of the above problems, the applicant proposes a battery pack sealing performance simulation evaluation method, including: providing a simulated sealing gasket, which is made of elastic material, and obtaining the mechanical performance parameters and dimensional parameters of the simulated sealing gasket; constructing a battery pack model, which includes a housing, a top cover, a simulated sealing gasket, and bolts, with the simulated sealing gasket located between the housing and the top cover, and the bolts used to connect the housing and the top cover; assigning the mechanical performance and dimensional parameters of the simulated sealing gasket to the battery pack model; creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack; and creating a battery pack sealing analysis condition based on the battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

[0023] The battery pack sealing performance simulation evaluation method provided in this application includes providing a simulated sealing gasket, constructing a battery pack model, assigning the mechanical properties and dimensional parameters of the simulated sealing gasket to the battery pack model, creating a battery pack preload analysis condition based on the battery pack model, and creating a battery pack sealing analysis condition based on the battery pack model. By using a simulated sealing gasket made of elastic material instead of the actual sealing gasket made of hyperelastic material, the mechanical property parameters of the simulated sealing gasket conform to a linear relationship, which greatly reduces the difficulty of constructing the battery pack model, thereby enabling the battery pack to simulate whether the battery pack seal fails when the top cover deforms.

[0024] The battery pack sealing performance simulation evaluation method provided in the embodiments of this application is described below with reference to the accompanying drawings.

[0025] Please refer to Figure 1 , Figure 1 This is one of the flowcharts for a battery pack sealing performance simulation evaluation method according to some embodiments of this application.

[0026] like Figure 1 As shown, this application provides a battery pack sealing performance simulation evaluation method, including the following steps:

[0027] Step S01: Provide a simulated sealing gasket, which is made of an elastic material, and obtain the mechanical performance parameters and dimensional parameters of the simulated sealing gasket.

[0028] Step S02: Construct a battery pack model. The battery pack model includes a housing, a top cover, a simulated sealing gasket, and bolts. The simulated sealing gasket is located between the housing and the top cover, and the bolts are used to connect the housing and the top cover.

[0029] Step S03: The mechanical properties and dimensional parameters of the simulated sealing gasket are assigned to the battery pack model.

[0030] Step S04: Based on the battery pack model, create a battery pack preload analysis working condition, apply preload to the bolts, and calculate whether the preload of the bolts meets the mechanical requirements of the battery pack.

[0031] Step S05: Based on the battery pack model, create a battery pack sealing analysis condition, apply pressure to the top cover, and calculate whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

[0032] Optionally, in step S02, the casing and top cover are modeled using 2D / 3D shell units, the bolts are modeled using connection units, and the simulated gasket is modeled using connection units. During the modeling of the simulated gasket, after dividing the simulated gasket into equal intervals according to a set length, a connection unit is created for each of the divided parts. The length of the created connection unit is less than the initial length of the simulated gasket. In step S04, calculating whether the bolt preload meets the mechanical requirements of the battery pack specifically involves calculating whether the preload applied to the bolt is sufficient to fix the casing and top cover together. Whether the casing and top cover can be fixedly connected depends on the dimensions of the casing, top cover, and bolts.

[0033] The battery pack sealing performance simulation evaluation method provided in this embodiment includes providing a simulated sealing gasket, constructing a battery pack model, assigning the mechanical properties and dimensional parameters of the simulated sealing gasket to the battery pack model, creating a battery pack preload analysis condition based on the battery pack model, and creating a battery pack sealing analysis condition based on the battery pack model. By using a simulated sealing gasket made of elastic material instead of the actual sealing gasket made of hyperelastic material, the mechanical property parameters of the simulated sealing gasket conform to a linear relationship, which greatly reduces the difficulty of constructing the battery pack model, thereby enabling the battery pack to simulate whether the battery pack seal fails when the top cover deforms.

[0034] In some optional embodiments, the mechanical performance parameters of the simulated gasket include: the compression-rebound linear curve of the simulated gasket, which describes the relationship between the pressure exerted on the simulated gasket at a set size and the rebound deformation size.

[0035] Optionally, the mechanical properties of the simulated gasket can be obtained using conventional equipment such as pressure testing machines and hardness testing machines, or from performance reports provided by the manufacturer. The dimensional parameters of the simulated gasket can be obtained using equipment such as vernier calipers.

[0036] Please refer to Figure 2 , Figure 2 The second flowchart illustrates an example of a battery pack sealing performance simulation evaluation method.

[0037] like Figure 2 As shown, in some optional embodiments, before step S04, the battery pack sealing performance simulation evaluation method may further include:

[0038] Step S031: Provide an actual sealing gasket, which is made of a superelastic material, and obtain the mechanical performance parameters and dimensional parameters of the actual sealing gasket.

[0039] In some optional embodiments, the mechanical performance parameters of the actual gasket include: the compression-rebound nonlinear curve of the actual gasket, which represents the relationship between the pressure received by the actual gasket at a given size and the rebound deformation. The compression-rebound nonlinear curve is important data for evaluating the sealing performance of the gasket, reflecting the relationship between the load and deformation during loading and unloading.

[0040] Optionally, the mechanical performance parameters of the actual gasket can be obtained using conventional equipment such as pressure testing machines and hardness testing machines, or from performance reports provided by the manufacturer. The dimensional parameters of the actual gasket can be obtained using equipment such as vernier calipers. A typical gasket compression-rebound nonlinear curve includes a loading curve and an unloading curve, which intersect at a critical point. The x-axis of this curve equation represents the deformation, and the y-axis represents the surface pressure. Data relevant to this embodiment includes maximum deformation, maximum surface pressure, and rebound. Maximum deformation is the x-axis value of the critical point, maximum surface pressure is the y-axis value of the critical point, and rebound is the difference between the x-axis value of the critical point and the x-axis value when the surface pressure is 0 in the unloading curve.

[0041] In some optional embodiments, after step S04, the battery pack sealing performance simulation evaluation method may further include:

[0042] Step S041: Calculate whether the preload of the bolt will crush the actual gasket.

[0043] Optionally, calculating whether the bolt preload will crush the actual gasket involves comparing the preload with the compression-rebound nonlinear curve of the actual gasket. If the actual gasket does not lose its rebound ability, the preload is considered not to crush it. Conversely, if the actual gasket loses its rebound ability, the preload is considered to have crushed it. In actual assembly, the bolt size and preload torque need to be adjusted so that the bolt preload meets the mechanical requirements for fixing the housing to the top cover without crushing the actual gasket.

[0044] The battery pack sealing performance simulation evaluation method provided in this embodiment checks whether the simulated torque meets the battery pack assembly requirements. Under the premise of meeting the battery pack assembly requirements, it compares the preload with the compression-rebound nonlinear curve of the actual sealing gasket to calculate whether the preload will crush the actual sealing gasket. This not only meets the requirements for battery pack simulation, but also combines conventional simulation analysis methods with measured data to ensure the reliability of the analysis results.

[0045] Please refer to Figure 3 , Figure 3 The third flowchart illustrates an example of a battery pack sealing performance simulation evaluation method.

[0046] like Figure 3 As shown, in some optional embodiments, step S05 includes:

[0047] Step S051: Based on the battery pack model, create a battery pack sealing analysis condition and apply pressure to the top cover.

[0048] Step S052: Measure the gap between the top cover and the box body after deformation.

[0049] Step S053: Compare the gap with the maximum rebound size of the actual sealing gasket.

[0050] In some optional embodiments, step S053 is: comparing the gap with the maximum rebound size of the actual sealing gasket under preload.

[0051] Optionally, the maximum rebound size of the actual gasket is related to the compression ratio, which in turn is related to the bolt preload.

[0052] The battery pack sealing performance simulation evaluation method provided in this embodiment reduces the difficulty of constructing the battery pack model by using a simulated sealing gasket of elastic material instead of the actual sealing gasket of the hyperelastic material. The simulation results are then combined with the measured mechanical performance parameters of the actual sealing gasket to determine whether the actual sealing gasket meets the battery pack sealing requirements, ensuring the reliability of the analysis results.

[0053] An embodiment of the second aspect of this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the above-mentioned battery pack sealing simulation evaluation method, such as: providing a simulated sealing gasket, the simulated sealing gasket being an elastic material; obtaining the mechanical performance parameters and dimensional parameters of the simulated sealing gasket; constructing a battery pack model, the battery pack model including a housing, a top cover, a simulated sealing gasket, and bolts, the simulated sealing gasket being located between the housing and the top cover, and the bolts being used to connect the housing and the top cover; assigning the mechanical performance and dimensional parameters of the simulated sealing gasket to the battery pack model; creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack; creating a battery pack sealing analysis condition based on the battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

[0054] An embodiment of the third aspect of this application also provides a computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the steps in the above-described battery pack sealing simulation evaluation method, such as: providing a simulated sealing gasket, the simulated sealing gasket being an elastic material; obtaining the mechanical performance parameters and dimensional parameters of the simulated sealing gasket; constructing a battery pack model, the battery pack model including a housing, a top cover, a simulated sealing gasket, and bolts, the simulated sealing gasket being located between the housing and the top cover, and the bolts being used to connect the housing and the top cover; assigning the mechanical performance and dimensional parameters of the simulated sealing gasket to the battery pack model; creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack; creating a battery pack sealing analysis condition based on the battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

[0055] The battery pack sealing performance simulation evaluation method, electronic device, and computer-readable storage medium provided in this embodiment include providing a simulated sealing gasket, constructing a battery pack model, assigning the mechanical properties and dimensional parameters of the simulated sealing gasket to the battery pack model, creating a battery pack preload analysis condition based on the battery pack model, and creating a battery pack sealing analysis condition based on the battery pack model. By using a simulated sealing gasket made of elastic material instead of the actual sealing gasket made of hyperelastic material, the mechanical property parameters of the simulated sealing gasket conform to a linear relationship, which greatly reduces the difficulty of constructing the battery pack model, thereby enabling the battery pack to simulate whether the battery pack seal fails when the top cover deforms.

[0056] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for simulating and evaluating the sealing performance of a battery pack, characterized in that, include: A simulated sealing gasket is provided, wherein the simulated sealing gasket is made of an elastic material, and the mechanical property parameters and dimensional parameters of the simulated sealing gasket are obtained; Construct a battery pack model, which includes a housing, a top cover, a simulated sealing gasket, and bolts. The simulated sealing gasket is located between the housing and the top cover, and the bolts are used to connect the housing and the top cover. The mechanical properties and dimensional parameters of the simulated sealing gasket are incorporated into the battery pack model; Based on the battery pack model, a battery pack preload analysis condition is created, a preload is applied to the bolts, and the preload of the bolts is calculated to determine whether the preload of the bolts meets the mechanical requirements of the battery pack. Based on the battery pack model, a battery pack sealing analysis condition is created, pressure is applied to the top cover, and it is calculated whether the gap between the top cover and the housing meets the sealing requirements of the battery pack.

2. The battery pack sealing performance simulation evaluation method according to claim 1, characterized in that, Before the steps of creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack, the method further includes: Provide an actual sealing gasket, wherein the actual sealing gasket is a hyperelastic material, and obtain the mechanical property parameters and dimensional parameters of the actual sealing gasket.

3. The battery pack sealing performance simulation evaluation method according to claim 2, characterized in that, After the steps of creating a battery pack preload analysis condition based on the battery pack model, applying preload to the bolts, and calculating whether the preload of the bolts meets the mechanical requirements of the battery pack, the method further includes: Calculate whether the preload of the bolt will crush the actual gasket.

4. The battery pack sealing performance simulation evaluation method according to claim 2, characterized in that, The steps of creating a battery pack sealing analysis condition based on the battery pack model, applying pressure to the top cover, and calculating whether the gap between the top cover and the housing meets the sealing requirements of the battery pack include: Based on the model of the battery pack, a battery pack sealing analysis condition is created, and pressure is applied to the top cover; Measure the gap between the top cover and the box body after deformation; Compare the gap with the maximum rebound size of the actual sealing gasket.

5. The battery pack sealing performance simulation evaluation method according to claim 4, characterized in that, The step of comparing the gap with the maximum rebound size of the actual sealing gasket is as follows: Compare the gap with the maximum rebound size of the actual sealing gasket under the preload.

6. The battery pack sealing performance simulation evaluation method according to claim 2, characterized in that, The mechanical performance parameters of the actual sealing gasket include: the compression-rebound nonlinear curve of the actual sealing gasket, which is the correspondence between the pressure and the rebound deformation size of the actual sealing gasket under a set size.

7. The battery pack sealing performance simulation evaluation method according to claim 1, characterized in that, The mechanical performance parameters of the simulated sealing gasket include: the compression-rebound linear curve of the simulated sealing gasket, which is the correspondence between the pressure and the rebound deformation size of the simulated sealing gasket under a set size.

8. An electronic device, characterized in that, It includes a memory and a processor, wherein the processor is used to implement the steps of the battery pack sealing simulation evaluation method as described in any one of claims 1-7 when executing a computer management program stored in the memory.

9. A computer-readable storage medium, characterized in that, It stores a computer management program, which, when executed by a processor, implements the steps of the battery pack sealing simulation evaluation method as described in any one of claims 1-7.

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