Module steel belt, design method of module steel belt, battery module and battery pack

Abstract

The embodiment of the invention discloses a module steel belt, a design method of the module steel belt, a battery module and a battery pack. The design method comprises the following steps: carrying out charge and discharge test on a battery cell of a target battery module; acquiring battery cell expansion data of the battery cell during the charging and discharging test; determining parameter information of a module steel belt according to the cell expansion data and material information of a preset candidate steel belt; according to the cell expansion data and the parameter information, the module steel belt corresponding to the target battery module is designed, and according to the scheme, the reliability of the module steel belt can be improved.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and particularly relates to a module steel strip, a design method of the module steel strip, a battery module, and a battery pack. Background Art

[0002] The module steel strip has excellent rigidity and strength, and can disperse the impact force and vibration that the battery module may encounter during transportation, installation, and use, protect the battery from external mechanical stress damage, and thus extend the service life of the battery.

[0003] Currently, the size of the module steel strip is determined according to the total length of the battery module and designed based on this. However, the designed module steel strip has not been checked too much, which may lead to insufficient strength of the steel strip, breakage of the steel strip, and damage to the battery module. It can be seen that the reliability of the module steel strip is not good. Summary of the Invention

[0004] The embodiments of this application provide a module steel strip, a design method of the module steel strip, a battery module, and a battery pack, which can improve the reliability of the module steel strip and avoid the situation that the strength of the module steel strip is insufficient and the battery module is damaged.

[0005] In a first aspect, the embodiments of this application provide a module steel strip. The module steel strip includes a horizontal section adapted to the side of the battery module and a vertical section adapted to the end of the battery module. The horizontal section and the vertical section of the module steel strip are designed based on the cell expansion data and parameter information of the cells in the battery module, and the cell expansion data is obtained by performing charge and discharge tests on the cells of the battery module.

[0006] Optionally, in some embodiments of this application, the thickness range of the module steel strip is 0.5 mm to 5 mm.

[0007] Preferably, in some embodiments of this application, the thickness range of the module steel strip is 0.5 mm to 1.5 mm.

[0008] Optionally, in some embodiments of this application, the width range of the module steel strip is 10 mm to 40 mm.

[0009] Preferably, in some embodiments of this application, the width range of the module steel strip is 25 mm to 35 mm.

[0010] Optionally, in some embodiments of this application, the expansion force of the cell is in the range of 40000 N to 80000 N.

[0011] Optionally, in some embodiments of the present application, the minimum cross-sectional area of the module steel strip satisfies σ = F / A1, where σ is the tensile strength of the module steel strip, F is the expansion force of the battery cell, and A1 is the minimum cross-sectional area of the module steel strip.

[0012] Optionally, in some embodiments of the present application, the designed cross-sectional area A2 of the module steel strip = the thickness of the module steel strip × the width of the module steel strip, and the designed cross-sectional area A2 > the expansion force of the battery cell / the tensile strength of the material, and the designed cross-sectional area A2 is greater than the minimum cross-sectional area A1.

[0013] Optionally, in some embodiments of the present application, the steel strip width of the module steel strip ≥ the minimum cross-sectional area of the module steel strip / the steel strip thickness of the module steel strip.

[0014] The embodiments of the present application provide a design method for a module steel strip, including:

[0015] Performing charge and discharge tests on the battery cells of the target battery module;

[0016] Obtaining the cell expansion data of the battery cell during the charge and discharge test;

[0017] Determining the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strip;

[0018] Designing the module steel strip corresponding to the target battery module according to the cell expansion data and the parameter information.

[0019] Optionally, in some embodiments of the present application, the determining the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strip includes:

[0020] Extracting the expansion force information and expansion rate information of the battery cell from the cell expansion data;

[0021] Obtaining the material information of the preset candidate steel strip;

[0022] Determining the parameter information of the module steel strip according to the expansion force information, expansion rate information, and material information.

[0023] Optionally, in some embodiments of the present application, the determining the parameter information of the module steel strip according to the expansion force information, expansion rate information, and material information includes:

[0024] Determining the stress condition corresponding to the module steel strip according to the expansion force information and expansion rate information;

[0025] Determining the parameter information of the module steel strip according to the stress condition and the material information.

[0026] Optionally, in some embodiments of the present application, determining the parameter information of the module steel belt according to the stress condition and material information includes:

[0027] Determining the mechanical strength corresponding to the preset candidate steel belts according to the material information;

[0028] Determining the material and size of the module steel belt corresponding to the module according to the stress condition and mechanical strength.

[0029] Optionally, in some embodiments of the present application, designing the module steel belt corresponding to the target battery module according to the cell expansion data and parameter information includes:

[0030] Designing a steel belt model corresponding to the parameter information according to the cell expansion data and parameter information;

[0031] Performing a simulation test on the steel belt model;

[0032] When the simulation test result meets the preset conditions, designing the module steel belt corresponding to the target battery module based on the steel belt model.

[0033] Optionally, in some embodiments of the present application, designing the steel belt model corresponding to the parameter information according to the cell expansion data and parameter information includes:

[0034] Obtaining a basic model;

[0035] Adjusting the basic model according to the cell expansion data and parameter information to obtain the steel belt model corresponding to the parameter information.

[0036] Optionally, in some embodiments of the present application, performing a simulation test on the steel belt model includes:

[0037] Applying loads and boundary conditions to the steel belt model according to the cell expansion data;

[0038] Performing a simulation test on the steel belt model with loads and boundary conditions applied.

[0039] Optionally, in some embodiments of the present application, obtaining the cell expansion data of the target battery module during charge and discharge tests includes:

[0040] During charge and discharge tests, obtaining the expansion force and expansion rate of the target battery module based on an expansion analysis system.

[0041] An embodiment of the present application further provides a battery module, including

[0042] A cell group;

[0043] A first end plate and a second end plate which are oppositely arranged, the first end plate and the second end plate clamping the battery cell group, and the battery cell group and the first end plate and the second end plate form a module assembly;

[0044] At least one module steel strip, the module steel strip binding the module assembly;

[0045] Wherein, the steel strip is made by using the design method of any one of the above-mentioned module steel strips.

[0046] An embodiment of the present application further provides a battery pack, including the battery module of the above embodiment;

[0047] And a battery box body, the battery module is arranged in the battery box body

[0048] The present application also provides a computer-readable storage medium, the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any one of the above methods are realized.

[0049] An embodiment of the present application provides a module steel strip, a design method of the module steel strip, a battery module and a battery pack. The module steel strip includes a horizontal section adapted to the side of the battery module and a vertical section adapted to the end of the battery module. The horizontal section and the vertical section of the module steel strip are obtained based on the cell expansion data and parameter information of the cells in the battery module. The cell expansion data is obtained by performing charge and discharge tests on the cells of the battery module. The design method of the module steel strip in the embodiment of the present application, after performing charge and discharge tests on the cells of the target battery module, obtains the cell expansion data of the cells during the charge and discharge tests. Then, according to the cell expansion data and the material information of the preset candidate steel strip, the parameter information of the module steel strip is determined. Finally, according to the cell expansion data and the parameter information, the module steel strip corresponding to the target battery module is designed. The module steel strip design scheme provided by the present application determines the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strip. Finally, using the cell expansion data and the parameter information, the module steel strip corresponding to the target battery module is designed, ensuring a strong correlation between the designed module steel strip and the target battery module. And, during the design, the cell expansion data of the cells of the target battery module during the charge and discharge process is also considered. Therefore, the matching degree between the steel strip and the target battery module is improved, and further the reliability of the module steel strip is improved, avoiding the situation that the strength of the module steel strip is insufficient and the battery module is damaged. Description of the Drawings

[0050] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0051] Figure 1 is a schematic flowchart of a design method for a module steel belt provided by an embodiment of the present application;

[0052] Figure 2 is a schematic structural diagram of a battery module provided by an embodiment of the present application;

[0053] Figure 3 is an exploded schematic diagram of a battery module provided by an embodiment of the present application;

[0054] Figure 4 is a schematic structural diagram of a battery pack provided by an embodiment of the present application. Detailed implementation manners

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0056] The embodiments of the present application provide a design method, device, electronic device, and storage medium for a module steel belt.

[0057] Among them, the design method of the module steel belt can be specifically applied to a terminal. The terminal can include a tablet computer or a personal computer (PC, Personal Computer). The terminal can establish a wired or wireless connection with a server. The server can include an independently operating server or a distributed server, or can also include a server cluster composed of multiple servers.

[0058] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0059] A design method for a module steel belt includes: performing charge and discharge tests on the battery cells of a target battery module; obtaining the cell expansion data of the battery cells during the charge and discharge tests; determining the parameter information of the module steel belt according to the cell expansion data and the material information of the preset candidate steel belts; and designing the module steel belt corresponding to the target battery module according to the cell expansion data and the parameter information.

[0060] Please refer to Figure 1 ,Figure 1 It is a schematic flowchart of the design method of the module steel belt provided by the embodiment of the present application. The specific process of the design method of the module steel belt can be as follows:

[0061] 101. Conduct charge and discharge tests on the battery cells of the target battery module.

[0062] The charge and discharge test is a basic experiment to evaluate the performance of the battery cell. It includes the processes of charging and discharging the battery cell and monitoring relevant parameters to obtain important data on the battery characteristics.

[0063] It charges the battery cell with a certain current and voltage until the battery cell reaches its rated voltage or the current drops to a preset low value. After reaching the rated voltage, the voltage is kept constant until the current drops close to zero, which is the constant voltage charging stage. It discharges the battery cell with a certain current until the battery cell voltage drops to a safe cut-off voltage.

[0064] For example, specifically, charge the battery cell with a current of 5A until the voltage reaches 4.2V. Keep the voltage of 4.2V until the charging current drops below 0.1A to complete the charging. During the discharging process, discharge the battery cell with a current of 5A until the voltage drops to 3.0V. Use a pressure sensor to monitor the change in the expansion force of the battery cell during the charge and discharge process, and record the maximum expansion force as 100N. Use a displacement sensor to measure the change in the length of the battery cell and calculate the expansion rate as 2%.

[0065] 102. Obtain the battery cell expansion data of the battery cell during the charge and discharge test.

[0066] During the charge and discharge process, use an expansion meter or in-situ expansion analyzer to monitor the expansion of the battery cell. These devices can measure the change in the thickness or volume of the battery in real time. Record the expansion data of the battery cell in different charging states, including the expansion rate, expansion force, and expansion amount. The expansion rate is usually expressed as a percentage. Analyze the relationship between the expansion data and the charge and discharge state of the battery cell to determine the expansion characteristics of the battery cell at different SOCs (State of Charge).

[0067] 103. Determine the parameter information of the module steel belt according to the battery cell expansion data and the material information of the preset candidate steel belt.

[0068] The preset candidate steel strips refer to several possible steel strip options pre-selected according to application requirements and performance requirements when designing the steel strip system of the battery module. These candidate steel strips usually have different material properties and dimensional specifications. The parameter information of the module steel strip refers to the specific technical details of the steel strip determined for the design of a specific battery module. These parameters ensure that the steel strip can adapt to the expansion characteristics of the battery cells while meeting the requirements of structural strength, durability, and safety. The parameter information of the module steel strip can include information such as material type, tensile strength, yield strength, width, length, and thickness. Tensile strength is the critical value at which a metal transitions from uniform plastic deformation to local concentrated plastic deformation, and it is also the maximum load-bearing capacity of the metal under static tensile conditions. Tensile strength characterizes the resistance of the material to the maximum uniform plastic deformation.

[0069] For example, detailed parameters of the candidate steel strip materials can be obtained, including tensile strength, yield strength, elongation at break, elastic modulus, etc. Then, based on the maximum expansion force and expansion rate of the battery cells, calculate the force and deformation amount that the steel strip needs to withstand. According to the calculation results and material parameters, design the dimensions of the steel strip, including width, thickness, and length. Ensure that the dimensions of the steel strip can adapt to the maximum expansion amount of the battery while providing sufficient strength and stiffness.

[0070] For example, specifically, the data obtained from the charge and discharge tests show that the maximum expansion force of the battery cells during full charge is 150 N, and the expansion rate is 3%. Material m (304 stainless steel): tensile strength 1200 MPa, yield strength 300 MPa, elongation at break 25%. Material n (6061 aluminum alloy): tensile strength 290 MPa, yield strength 160 MPa, elongation at break 12%. Analyzing the battery cell expansion data shows: expansion force: 150 N; expansion rate: 3%. Then, based on the expansion force and the tensile strength of the material, select the material that can safely withstand this force. The tensile strength of material m (304 stainless steel) is 1200 MPa, which is much higher than that of material n (6061 aluminum alloy), so material m is selected. Use the formula σ = F / A1 to calculate the cross-sectional area of the steel strip, where σ is the tensile strength of the module steel strip, F is the expansion force of the battery cells, and A1 is the minimum cross-sectional area of the module steel strip. The allowable stress is taken as a certain proportion of the yield strength of material m, such as 60%, σ = 0.6×300 MPa = 180 MPa, A = F / σ = 150 N / 180 MPa = 8.33x10 -7 m 2 。

[0071] If the selected width of the steel strip is 20 mm, then the thickness t = A / width = 8.33x10-7 m2 / 20 mm = 0.0417 mm. However, it should be noted that since the thickness of the steel strip usually cannot be made so thin, it needs to be rounded up to an actual machinable size, such as 0.1 mm.

[0072] In addition, it should be noted that in some embodiments of the present application, the width of the steel strip needs to be greater than the cross-sectional area of the steel strip / the thickness of the steel strip. If the calculated width of the steel strip is not within this range, the material is reselected and recalculated for design.

[0073] It should also be noted that in some embodiments of the present application, the designed cross-sectional area A2 of the module steel strip = the thickness of the module steel strip × the width of the module steel strip, and the designed cross-sectional area A2 > the expansion force of the battery cell / the tensile strength of the material. Thus, it is ensured that when the steel strip bears the expansion force of the battery cell, its stress does not exceed the tensile strength of the material. And, the designed cross-sectional area A2 is greater than the minimum cross-sectional area A1. Thus, it is ensured that the foot bath steel strip not only meets the basic mechanical requirements, but also takes into account manufacturing tolerances, material non-uniformity and other practical factors.

[0074] Optionally, in some embodiments of the present application, the step of "determining the parameter information of the module steel strip according to the battery cell expansion data and the material information of the preset candidate steel strip" may specifically include:

[0075] Extracting the expansion force information and expansion rate information of the battery cell from the battery cell expansion data;

[0076] Obtaining the material information of the preset candidate steel strip;

[0077] Determining the parameter information of the module steel strip according to the expansion force information, expansion rate information and material information.

[0078] Among them, the expansion force information refers to the force generated due to the volume change caused by the internal chemical reaction of the battery cell during the charge and discharge process of the battery cell; the expansion rate information describes the percentage of the volume change of the battery cell during the charge and discharge process, which is a key parameter for evaluating the thermodynamic stability and structural integrity of the battery.

[0079] Optionally, in some embodiments of the present application, the step of "determining the parameter information of the module steel strip according to the expansion force information, expansion rate information and material information" may specifically include:

[0080] Determining the stress condition corresponding to the module steel strip according to the expansion force information and expansion rate information;

[0081] Determining the parameter information of the module steel strip according to the stress condition and material information.

[0082] For example, specifically, using the principles of mechanics of materials, calculate the stress in the steel strip based on the expansion force and the cross-sectional area of the steel strip. According to the expansion rate information, evaluate the degree of deformation that the module steel strip needs to adapt to. This will affect the design of the steel strip to ensure that it does not fail due to excessive deformation. According to the material information of the candidate steel strip, select a material with sufficient tensile strength and yield strength to withstand the calculated stress. Determine the width and thickness of the module steel strip to ensure that the steel strip does not break or undergo plastic deformation under the maximum stress. Then, use simulation tools such as finite element analysis (FEA) to simulate the behavior of the steel strip under actual working conditions and verify whether the designed steel strip can meet the strength and durability requirements. If the simulation results show that the steel strip design does not meet the requirements, adjust the size or material of the steel strip and then re-perform the simulation analysis until the final parameters of the steel strip are determined, including material type, size (width, thickness, length), pre-tightening force, etc.

[0083] Optionally, in some embodiments of the present application, the step of "determining the parameter information of the module steel strip according to the stress condition and material information" may specifically include:

[0084] Determine the mechanical strength corresponding to the preset candidate steel strip according to the material information;

[0085] Determine the material and size corresponding to the module steel strip according to the stress condition and mechanical strength.

[0086] For example, specifically, the material information of the candidate steel strip can be obtained, including tensile strength, yield strength, fracture elongation, elastic modulus, etc. Analyze the performance data of each candidate material to determine whether the candidate steel strip meets the basic mechanical performance requirements. Calculate the actual stress in the steel strip during operation according to the cell expansion data to ensure that this stress value is lower than the yield strength of the material. Select one or several materials from the candidate materials that can withstand the expected working stress. Calculate the required cross-sectional area of the steel strip according to the working stress and the tensile strength of the material to ensure that the steel strip does not break under the maximum expansion force.

[0087] 104. Design the module steel strip corresponding to the target battery module according to the cell expansion data and parameter information.

[0088] For example, fabricate a steel strip prototype according to the finally determined design parameters. Conduct actual tests on the steel strip prototype to verify its performance and durability during cell expansion. Ensure that the performance of the steel strip prototype in actual application meets the design requirements. Prepare detailed design documents and manufacturing drawings for mass production of the module steel strip corresponding to the target battery module.

[0089] Optionally, in some embodiments of the present application, the step of "designing the module steel strip corresponding to the target battery module according to the cell expansion data and parameter information" may specifically include:

[0090] Design a steel belt model corresponding to the parameter information according to the cell expansion data and parameter information;

[0091] Conduct a simulation test on the steel belt model;

[0092] When the simulation test result meets the preset conditions, design the module steel belt corresponding to the target battery module based on the steel belt model.

[0093] The preset conditions refer to the parameters and standards set based on design requirements and safety standards to evaluate whether the simulation results are acceptable. The preset conditions can be that the stress in the steel belt shall not exceed a certain percentage of the yield strength or tensile strength of the material to avoid plastic deformation or fracture, the deformation amount of the steel belt shall not exceed the maximum value allowed by the design to ensure the structural integrity and function of the battery module, and / or the steel belt must be able to withstand the repeated stress and strain caused by multiple charge and discharge cycles without fatigue failure.

[0094] For example, specifically, calculate the size parameters of the steel belt, including width, thickness and length, according to the expansion force and expansion rate. Design the three-dimensional geometric model of the steel belt according to the calculated size parameters. Import the steel belt model into computer-aided engineering (CAE) software, and set the boundary conditions and loading conditions for the simulation analysis. Input the properties of the steel belt material, such as elastic modulus, Poisson's ratio, density and yield strength. Apply the corresponding loads and constraints according to the cell expansion data to simulate the stress condition of the steel belt under actual working conditions. Perform the simulation calculation, and monitor the responses such as stress, strain and displacement of the steel belt under the simulated expansion force. Analyze the simulation results to evaluate whether the steel belt meets the design requirements, such as whether the stress is within the allowable range of the material and whether the deformation is controllable. If the simulation test result meets the preset conditions (such as the maximum stress of the steel belt is lower than the tensile strength of the material and the deformation amount is within the allowable range), manufacture a physical object according to the finally confirmed steel belt model, and conduct necessary physical tests to verify the simulation results.

[0095] Optionally, in some embodiments of the present application, the step of "designing a steel belt model corresponding to the parameter information according to the cell expansion data and parameter information" may specifically include:

[0096] Obtain the basic model;

[0097] Adjust the basic model according to the cell expansion data and parameter information to obtain the steel belt model corresponding to the parameter information.

[0098] For example, specifically, select or create a basic model, which is a general model of the steel strip and can be a 2D drawing or a 3D CAD model. Optionally, in some embodiments of the present application, ensure that the basic model contains all necessary geometric details, such as dimensions, tolerances, and material properties. Obtain key parameters such as expansion force and expansion rate from the cell test to determine the expansion characteristics of the battery under different states. Adjust the dimensions of the steel strip model according to the expansion data, adjust the width, thickness, and length of the steel strip to adapt to the changes caused by cell expansion. Calculate the required cross-sectional area of the steel strip based on the cell expansion force and the mechanical properties of the steel strip material (such as tensile strength, yield strength). Design a detailed model of the steel strip according to the adjusted dimensions. Design the pre-tightening force of the steel strip to ensure that the steel strip can provide sufficient pressure to resist battery expansion when installed. Use CAE software to perform a simulation test on the adjusted steel strip model to simulate the stress conditions under actual working conditions. Analyze the simulation results to check whether the steel strip meets all design requirements, such as stress, deformation, etc. If the simulation results do not meet the design requirements, further adjust the steel strip model according to the analysis results and repeat the simulation test. When the steel strip model passes all simulation tests, determine that the steel strip model is the model of the module steel strip corresponding to the target battery module.

[0099] Optionally, in some embodiments of the present application, the step of "performing a simulation test on the steel strip model" may specifically include:

[0100] Apply loads and boundary conditions to the steel strip model according to the cell expansion data;

[0101] Perform a simulation test on the steel strip model with loads and boundary conditions applied.

[0102] For example, determine the magnitude of the load to be applied to the steel strip according to the maximum expansion force recorded during the charge and discharge test of the cell. Apply the corresponding expansion force to the steel strip model, which can be specifically implemented through the load definition function in finite element analysis (FEA) software. Set appropriate fixed constraints according to the actual fixing method of the steel strip in the battery module. For example, if one end of the steel strip is fixed, apply a fixed constraint at the corresponding position in the model. If the displacement of the steel strip is restricted in certain directions, corresponding displacement constraints need to be set. If the steel strip model has symmetry, this characteristic can be utilized to simplify the model and reduce the calculation amount. Then, select an appropriate simulation type according to the analysis purpose, such as static structural analysis, dynamic analysis, fatigue analysis, etc. Input the properties of the steel strip material into the simulation model, including elastic modulus, Poisson's ratio, yield strength, etc. Start the simulation calculation, and the software will solve the response of the steel strip model according to the defined loads and boundary conditions. Monitor the convergence and accuracy of the calculation during the simulation operation to ensure the reliability of the simulation results.

[0103] The embodiment of the present application provides a design method for a module steel strip. After performing charge and discharge tests on the battery cells of a target battery module, the cell expansion data of the battery cells during the charge and discharge tests is obtained. Then, based on the cell expansion data and the material information of the preset candidate steel strips, the parameter information of the module steel strip is determined. Finally, based on the cell expansion data and the parameter information, the module steel strip corresponding to the target battery module is designed. The module steel strip design solution provided by the present application determines the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strips. Finally, using the cell expansion data and the parameter information, the module steel strip corresponding to the target battery module is designed to ensure a strong correlation between the designed module steel strip and the target battery module. Moreover, during the design, the cell expansion data of the battery cells during the charge and discharge process is also considered. Therefore, the matching degree between the steel strip and the target battery module is improved, and further the reliability of the module steel strip is improved.

[0104] Please refer to Figure 2 , the embodiment of the present application provides a module steel strip 30. The module steel strip 30 includes a horizontal section adapted to the side of the battery module and a vertical section adapted to the end of the battery module. Among them, the horizontal section and the vertical section of the module steel strip 30 are designed based on the cell expansion data and the parameter information of the battery cells in the battery module. The cell expansion data is obtained by performing charge and discharge tests on the battery cells of the battery module. For the specific design method, please refer to the steps of the previous embodiment and will not be elaborated here. During the operation of the battery module, the expansion force generated by the charge and discharge of the battery cells will show different distribution characteristics in different parts. The coordinated action of the horizontal section and the vertical section can more effectively disperse and withstand these forces. Compared with the steel strip with a traditional single structure, it can more accurately meet the force requirements of different parts of the module and ensure the structural stability of the module. The design of this adjustable steel strip optimizes the design method of the battery module steel strip. On the one hand, it ensures that the strength of the steel strip can meet the design requirements of different parts of the module, improving the safety and stability of the battery module during use; on the other hand, through precise design, it avoids the design redundancy problem that may occur in traditional steel strips, reduces unnecessary material use, and thus effectively reduces the cost of the steel strip, achieving cost optimization while improving product performance.

[0105] Optionally, in some embodiments of the present application, the thickness range of the module steel strip is 0.5 mm to 5 mm.

[0106] Optionally, in some embodiments of the present application, the thickness range of the module steel strip 30 is 0.5 mm to 1.5 mm.

[0107] Optionally, in some embodiments of the present application, the width range of the module steel strip 30 is 10 mm to 40 mm.

[0108] Optionally, in some embodiments of the present application, the width range of the module steel strip 30 is 25 mm to 35 mm.

[0109] Optionally, in some embodiments of the present application, the expansion force of the battery cell is in the range of 40,000 N to 80,000 N.

[0110] Optionally, in some embodiments of the present application, the minimum cross-sectional area of the module steel strip 30 satisfies σ = F / A1, where σ is the tensile strength of the module steel strip, F is the expansion force of the battery cell, and A1 is the minimum cross-sectional area of the module steel strip 30.

[0111] Optionally, in some embodiments of the present application, the designed cross-sectional area A2 of the module steel strip 30 = the thickness of the module steel strip 30 × the width of the module steel strip 30, and the designed cross-sectional area A2 > the expansion force of the battery cell / the tensile strength of the material, and the designed cross-sectional area A2 is greater than the minimum cross-sectional area A1.

[0112] Optionally, in some embodiments of the present application, the steel strip width of the module steel strip 30 ≥ the minimum cross-sectional area of the module steel strip 30 / the steel strip thickness of the module steel strip 30.

[0113] Correspondingly, the embodiments of the present application further provide a battery module, as Figure 2 and Figure 3 shown. The battery module 1 includes a battery cell group 10, a first end plate 20a and a second end plate 20b arranged oppositely, and at least one module steel strip 30. The battery cell group 10 and the first end plate 20a and the second end plate 20b form a module assembly, and the module steel strip 30 binds the module assembly. Among them, the module steel strip 30 is made by using the design method of any of the above module steel strips.

[0114] Among them, the battery cell group 10 includes battery cells 101 arranged at intervals and heat insulation pads 102 arranged between adjacent battery cells 101, and further includes a first insulating sheet 103 arranged between the battery cell 101 and the first end plate 20a, and a second insulating sheet 104 arranged between the battery cell 101 and the second end plate 20b. In addition, a battery connection system (Cell Connection System, CCS) component 40 is further arranged among the plurality of battery cells 101. The CCS component 40 is responsible for the electrical connection between the battery cells 101 and the connection between the battery cells 101 and the external circuit, ensuring that the battery module 1 can operate safely and effectively.

[0115] In addition, the embodiments of the present application further provide a battery pack, as Figure 4As shown in the figure, it shows a schematic structural diagram of a battery pack according to an embodiment of the present application. The battery pack includes the battery module 1 of the above embodiment and a battery box body 2, and the battery module 1 is disposed in the battery box body 2. Since the battery pack has the battery module 1 in the above embodiment, and the battery module 1 includes the module steel strip 30 of the embodiment of the present application, therefore, it has some or all of the beneficial effects of the above embodiment of the module steel strip 30, which will not be elaborated here one by one.

[0116] The above has introduced in detail a module steel strip, a design method of the module steel strip, a battery module and a battery pack provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A modular steel strip, characterized in that, The module steel strip includes a horizontal section adapted to the side of the battery module and a vertical section adapted to the end of the battery module. The horizontal and vertical sections of the module steel strip are designed based on the cell expansion data and parameter information of the cells in the battery module, and the cell expansion data is obtained by performing charge and discharge tests on the cells of the battery module.

2. The modular steel strip according to claim 1, wherein, The thickness range of the module steel strip is 0.5 mm to 5 mm. Preferably, the thickness range of the module steel strip is 0.5 mm to 1.5 mm.

3. The modular steel strip according to claim 1, characterized in that, The width range of the module steel strip is 10 mm to 40 mm. Preferably, the width range of the module steel strip is 25 mm to 35 mm.

4. The modular steel strip according to claim 1, wherein The expansion force of the cell is in the range of 40000 N to 80000 N.

5. The modular steel strip according to claim 1, characterized in that, The minimum cross-sectional area of the module steel strip satisfies σ = F / A1, where σ is the tensile strength of the module steel strip, F is the expansion force of the cell, and A1 is the minimum cross-sectional area of the module steel strip.

6. The modular steel strip according to claim 5, characterized in that, The designed cross-sectional area A2 of the module steel strip = the thickness of the module steel strip × the width of the module steel strip, and the designed cross-sectional area A2 > the cell expansion force / the material tensile strength, and the designed cross-sectional area A2 is greater than the minimum cross-sectional area A1.

7. The modular steel strip according to claim 1, wherein The steel strip width of the module steel strip ≥ the minimum cross-sectional area of the module steel strip / the steel strip thickness of the module steel strip.

8. A design method for a module steel strip, characterized in that, Includes: Performing charge and discharge tests on the cells of the target battery module; Obtaining the cell expansion data of the cells during the charge and discharge tests; Determining the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strip; Designing the module steel strip corresponding to the target battery module according to the cell expansion data and the parameter information.

9. The design method of the modular steel strip according to claim 8, wherein, The determining the parameter information of the module steel strip according to the cell expansion data and the material information of the preset candidate steel strip includes: Extracting the expansion force information and expansion rate information of the cell from the cell expansion data; Obtaining the material information of the preset candidate steel strip; Determining the parameter information of the module steel strip according to the expansion force information, expansion rate information, and material information.

10. The design method of the modular steel strip according to claim 9, characterized in that, The determining the parameter information of the module steel strip according to the expansion force information, expansion rate information, and material information includes: Determining the stress condition corresponding to the module steel strip according to the expansion force information and expansion rate information; Determining the parameter information of the module steel strip according to the stress condition and the material information.

11. The design method of the modular steel strip according to claim 10, characterized in that, The determining the parameter information of the module steel strip according to the stress condition and the material information includes: Determining the mechanical strength corresponding to the preset candidate steel strip according to the material information; Determining the material and dimensions corresponding to the module steel strip according to the stress condition and the mechanical strength.

12. The design method of the module steel strip according to claim 8, characterized in that, The designing the module steel strip corresponding to the target battery module according to the cell expansion data and the parameter information includes: Designing a steel strip model corresponding to the parameter information according to the cell expansion data and the parameter information; Performing a simulation test on the steel strip model; When the simulation test result meets the preset conditions, then designing the module steel strip corresponding to the target battery module based on the steel strip model.

13. The design method of the module steel strip according to claim 12, characterized in that, The designing a steel strip model corresponding to the parameter information according to the cell expansion data and the parameter information includes: Obtain the basic model; Adjust the basic model according to the cell expansion data and parameter information to obtain the steel strip model corresponding to the parameter information.

14. The design method of the modular steel strip according to claim 12, wherein, The simulation test on the steel strip model includes: Apply loads and boundary conditions to the steel strip model according to the cell expansion data; Conduct a simulation test on the steel strip model with loads and boundary conditions applied.

15. The design method of the modular steel strip according to claim 8, characterized in that, The obtaining of the cell expansion data of the cell during charge and discharge tests includes: During the charge and discharge tests, obtain the expansion force and expansion rate of the cell based on the expansion analysis system.

16. A battery module, characterized in that, It includes: Cell group; A first end plate and a second end plate arranged oppositely, the first end plate and the second end plate clamp the cell group, and the cell group and the first end plate and the second end plate form a module assembly; At least one module steel strip, which binds the module assembly; Wherein, the steel strip is made by the design method of the module steel strip according to any one of claims 10-17.

17. A battery pack, characterized in that, It includes: The battery module according to claim 16; And A battery box, and the battery module is arranged in the battery box.

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