Method and system for measuring and calculating parameters of compressible component of battery in box and storage medium

Abstract

The invention discloses a method and a system for measuring and calculating parameters of a compressible component of a battery entering a box and a storage medium. The method comprises the following steps: firstly, obtaining a residual space and a clamping force safety interval after a battery module enters the box as physical constraints; then establishing a piecewise linear mechanical model for representing the nonlinear compression behavior of the compressible part, wherein the model divides the mechanical behavior into an elastic section, a platform section and a densification section; and finally, taking the residual space as a total target compression amount, taking a target value of the clamping force safety interval as a total target reaction force, carrying out joint inversion solution through the piecewise linear mechanical model, and outputting key design parameters such as contact area, initial thickness and working compression ratio of end plate foam and / or battery cell adhesive tape. Traditional manual trial and error are replaced by theoretical calculation, process and component parameters can be accurately quantified at the initial stage of design, assembly potential safety hazards are fundamentally eradicated, and development efficiency and product reliability are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery manufacturing, in particular to a battery-in-box compressible component parameter calculation method and system and a storage medium. BACKGROUND

[0002] With the evolution of power battery technology towards the direction of no module (CTP), it has become a mainstream process to directly stack battery cells into a module (Block) and then load it into a battery pack box. In this process, the Block lacks circumferential rigidity and needs to be clamped and pressed into the box by a clamping mechanism. Compressible components such as end plate foam and cell rubber strips are usually provided between the Block and the box and between the battery cells to buffer, fix and reserve space for cell expansion.

[0003] However, at the initial stage of assembly process design, there is a lack of theoretical guidance on how to determine the key parameters (such as contact area, initial thickness, compression rate) of these compressible components (foam, rubber strip) and the clamping force of the clamping mechanism, mainly relying on the experience of engineers and repeated physical trial and error. This leads to the following problems: if the clamping force is too small, it may cause the Block to slip during the transfer process, or it may not achieve the interference fit in the box, resulting in assembly failure; if the clamping force is too large, it may exceed the yield strength of the cell shell, causing plastic deformation and serious safety hazards. At the same time, if the parameters of the compressible components are not properly selected, it may also cause problems such as uncontrolled clamping force or insufficient compression. This trial and error method not only consumes a lot of manpower, materials and time, prolonging the development cycle, but also easily damages expensive battery cells during parameter adjustment due to the difficulty of Block structure disassembly. SUMMARY

[0004] The present application provides a battery-in-box compressible component parameter calculation method and system and a storage medium, which can solve the technical problems of long cycle and safety hazards in the prior art that manual trial and error is used to determine the key parameters of the compressible components (foam, rubber strip) and the clamping force of the clamping mechanism at the initial stage of assembly process design.

[0005] In a first aspect, the embodiments of the present application provide a battery-in-box compressible component parameter calculation method, which comprises: obtaining a clamping force safety interval of a clamping mechanism applied in the process of pressing a battery module into a battery pack box, and a remaining space after the battery module is loaded into the box; the remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or cell rubber strips; establishing a piecewise linear mechanical model representing the nonlinear compression behavior of the compressible components; the piecewise linear mechanical model includes an elastic segment mechanical model, a platform segment mechanical model and a densification segment mechanical model for representing force and compression amount; The remaining space is taken as a total target compression amount of the compressible component, and a target value of the clamping force safety interval is taken as a total target reaction force. The contact area, initial thickness, and working compression rate of the compressible component are solved by the piecewise linear mechanical model through joint inversion.

[0006] Preferably, a piecewise linear mechanical model characterizing the nonlinear compression behavior of the compressible component is established, and specifically includes the following steps: Obtaining the stress-strain relationship of the elastic segment, the stress-strain relationship of the platform segment, and the stress-strain relationship of the densification segment. Converting the stress-strain relationship of the elastic segment, the stress-strain relationship of the platform segment, and the stress-strain relationship of the densification segment into a relationship formula characterizing force and compression amount, respectively, to obtain an elastic segment mechanical model, a platform segment mechanical model, and a densification segment mechanical model; and combining the elastic segment mechanical model, the platform segment mechanical model, and the densification segment mechanical model to form a piecewise linear mechanical model.

[0007] Preferably, the stress-strain relationship of the elastic segment is: σ = E1· ; wherein E1 is the elastic modulus The stress-strain relationship of the platform segment is: (σ ≈ ) The stress-strain relationship of the densification segment is: σ = E2· · ; The piecewise linear mechanical model is: F = ; wherein σ is stress, and is strain, A is contact area, is the elastic modulus of the elastic segment, is the stress of the platform segment, is the elastic modulus of the densification segment, is the initial thickness, is a single target compression amount, is the elastic limit displacement, is the densification start displacement.

[0008] Preferably, the contact area, initial thickness, and working compression rate of the compressible component are solved, and specifically include the following steps: The total target compression amount is distributed to the end plate foam and the plurality of cell rubber strips to obtain a single target compression amount of each compressible component; The total target reaction force is distributed to the end plate foam and the cell rubber strips to obtain a single target reaction force required to be provided by each compressible component; For each compressible component, its corresponding single target compression amount and single target counterforce are utilized to solve its corresponding contact area, initial thickness and working compression rate in combination with the piecewise linear mechanics model.

[0009] Preferably, the contact area, initial thickness and working compression rate of a compressible component are calculated, specifically including the following steps: The piecewise linear mechanics model is taken as a solver, the single target compression amount of the current compressible component is taken as a model input, and an equation group about the contact area and initial thickness is established with the condition that the output counterforce calculated by the piecewise linear mechanics model is equal to the single target counterforce; The equation group is solved to calculate the contact area and initial thickness that meet the condition, and the working compression rate is determined based on the compression amount and initial thickness.

[0010] Preferably, the remaining space is obtained, specifically including the following steps: The internal length dimension of the battery pack box, the number of battery cells in the single-column battery module, the thickness of a single battery cell and the thickness of the end plate are obtained; The remaining space is calculated by a remaining length calculation formula in combination with the internal length dimension of the battery pack box, the number of battery cells in the single-column battery module, the thickness of a single battery cell and the thickness of the end plate.

[0011] Preferably, the remaining length calculation formula is: L 剩余 =L 箱体 -n 电芯 *A 电芯 -2*A 端板 =2*h ’ 泡棉 +(n-1)*h ’ 胶条 ; Wherein L 箱体 is the internal length of the box, n 电芯 is the number of battery cells in the single-column battery module, A 电芯 is the thickness of the battery cell, A 端板 is the thickness of the end plate, h ’ 泡棉 is the compressed end plate foam thickness, h ’ 胶条 is the compressed battery cell adhesive strip thickness.

[0012] Preferably, the clamping force safety range of the clamping mechanism during the process of pressing the battery module into the battery pack box is calculated, specifically including the following steps: Obtain the physical parameters and material performance parameters of the battery module. The physical parameters include the mass of the battery module and the static friction coefficient of the contact surface between the clamping mechanism and the battery module. The material performance parameters include the yield strength of the cell shell and the adhesive area of ​​the cell adhesive strip. Based on the mass of the battery module and the static friction coefficient, and with the minimum clamping force being equal to twice the weight of the battery module and the static friction coefficient, the minimum clamping force required to ensure that the battery module does not slip during clamping is calculated. Based on the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, and with the maximum clamping force equal to the product of the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, the maximum clamping force is calculated to ensure that the battery cell housing does not undergo plastic deformation during clamping. The minimum clamping force and the maximum clamping force are used to define the safe range of clamping force.

[0013] Secondly, embodiments of this application provide a system for calculating parameters of compressible components in a battery case, comprising: The constraint determination module is used to obtain the safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack box, as well as the remaining space after the battery module is put into the box; the remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or cell adhesive strips; The mechanical model module is used to establish a piecewise linear mechanical model that characterizes the nonlinear compression behavior of compressible components; the piecewise linear mechanical model includes an elastic segment mechanical model, a plateau segment mechanical model, and a densification segment mechanical model for characterizing force and compression. The parameter solving module is used to take the remaining space as the total target compression amount of the compressible component and the target value of the clamping force safety range as the total target reaction force. Through the piecewise linear mechanical model, the contact area, initial thickness and working compression ratio of the compressible component are jointly solved by inversion.

[0014] Thirdly, embodiments of this application provide a computer-readable storage medium storing a program for calculating parameters of compressible components in a battery case, wherein when the program is executed by a processor, it implements the steps of a method for calculating parameters of compressible components in a battery case.

[0015] The beneficial effects of the technical solutions provided in this application include: This invention fundamentally eliminates safety hazards and achieves quantitative design of safety boundaries. In existing technologies, clamping forces and compressible component parameters are set empirically, inherently risking that insufficient clamping force may cause the battery module to slip off, or excessive clamping force may cause plastic deformation of the cell casing. This invention, by obtaining a safe clamping force range and using it as the core input, transforms the two safety objectives of preventing slippage and damage into a precisely quantified operational window defined by the minimum and maximum clamping forces. Furthermore, in subsequent inversion solutions, all resulting parameter combinations naturally satisfy this safety boundary, thus proactively embedding a safety assurance mechanism at the design stage and completely eliminating safety hazards caused by parameter mismatch.

[0016] Traditional methods require repeated sample making, assembly, and testing, which is time-consuming. This invention, through the establishment of a piecewise linear mechanical model, allows designers to quickly and accurately output a complete set of key parameters such as the contact area, initial thickness, and working compression ratio of compressible components without any physical trial assembly, simply by inputting known boundary conditions. This significantly improves R&D efficiency and reduces development costs.

[0017] Manual trial and error struggles to comprehensively consider all parameters, often resulting in overlooking some aspects. Joint inversion solutions place spatial constraints (remaining space) and mechanical constraints (clamping force target) on an equal footing, forcing the derived parameters to simultaneously meet both conditions through mathematical models. This ensures that the final solution is perfectly compatible with the battery pack in terms of geometric assembly and precisely matched with the clamping mechanism in terms of mechanical behavior. The output is a globally optimized and highly coordinated parameter system, thereby guaranteeing the first-time success rate of the assembly process and the consistency of product performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a block being placed into a container; Figure 2 This is a schematic diagram of the block clamping state; Figure 3 A diagram illustrating block sorting; Figure 4 This is a diagram illustrating the application of adhesive strips to the battery cells. Figure 5 This is a flowchart illustrating the method for calculating the parameters of compressible components in a battery box, as described in the embodiments of this application.

[0019] In the diagram: 1. Battery module; 2. Battery pack housing; 3. Cell clamp; 4. Clamping pad; 5. Lower pressure plate; 6. Assembly plate; 7. Front crossbeam of battery pack; 8. Middle crossbeam of battery pack; 9. Cell end plate; 10. End plate foam; 11. Cell; 12. Cell adhesive strip. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0022] The block refers to the battery module; see reference. Figure 1 As shown. The technical problem this invention aims to solve is: determining the applicable range of clamping force required during the battery module insertion process based on assembly boundary conditions and material property parameters. Based on this, a mathematical calculation model is established to quantify the key parameters of the buffer material (foam) and connecting material (adhesive strip), including but not limited to their contact area, thickness, and compression ratio.

[0023] Please refer to the following description for specific scenarios: like Figure 1 Battery module 1 needs to be assembled into battery pack housing 2. Given the high smoothness of the outer surface of battery module 1 and the fact that the assembly gap between it and battery pack housing 2 is only 3-4 mm, specialized equipment is required to assist in the installation process. Figure 2 The battery module 1 needs to be clamped circumferentially by the cell clamping claws 3 and clamping pads 4 to lift and transfer it to the top of the battery pack housing 2. While maintaining the clamping force in the direction of the cell end plate 9, the battery module 1 is partially inserted into the battery pack housing 2. After the battery module 1 reaches the predetermined position, the circumferential clamping force is released. At this time, the block compression size is locked by the front crossbeam 7 and the middle crossbeam 8 of the battery pack. Then, the battery module 1 is pressed down into the designated position inside the battery pack housing 2 by the assembly plate 6 and the lower pressure plate 5Z. The stacking arrangement of a single block is as follows: Figure 3 As shown, the end plate consists of a cell end plate 9 and an end plate foam 10, which are used to protect the cell. Cells 11 are connected to each other by cell adhesive strips 12, ensuring connection while also providing space for cell expansion. The adhesive strips are positioned as shown in the diagram. Figure 4 The label B is shown.

[0024] The following section provides a detailed explanation and specific implementation plan: Firstly, reference Figure 5 As shown in the figure, this application provides a method for calculating the parameters of compressible components in a battery box, which includes: Step 100: Obtain the safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack box, and the remaining space after the battery module is placed into the box; the remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or cell adhesive strips; Step 200: Establish a piecewise linear mechanical model characterizing the nonlinear compression behavior of the compressible component; the piecewise linear mechanical model includes an elastic segment mechanical model, a plateau segment mechanical model, and a densification segment mechanical model to characterize the force and compression amount; Step 300: Using the remaining space as the total target compression amount of the compressible component and the target value of the clamping force safety range as the total target reaction force, the contact area, initial thickness and working compression ratio of the compressible component are solved by joint inversion through the piecewise linear mechanical model.

[0025] A design process based on model inversion was constructed, which fundamentally replaced the traditional trial-and-error method that relied on human experience, and realized the leap from experience-based to theoretical prediction in the battery module packing process.

[0026] First, by identifying the safe range of clamping force and the remaining space, the vague qualitative requirement in engineering—that the clamping force cannot be too large or too small—and the qualitative understanding that foam needs to be compressed, are transformed into two precise and quantifiable physical constraint boundaries. This lays an objective foundation for subsequent accurate calculations. Second, the piecewise linear mechanical model is not based on an overly idealized simple linear model or an overly complex nonlinear model, but rather accurately captures the three typical mechanical stages of foam-like materials: elastic deformation, platform collapse, and densification hardening. This allows for high-fidelity simulation of the real mechanical behavior of compressible components, which is the theoretical prerequisite for accurate calculations. Finally, the most core contribution of this invention is to use spatial and force constraints as objectives and solve for parameters through joint model inversion. It changes the traditional forward thinking of "given parameters - verifying performance" and pioneers the reverse design paradigm of "given performance target - reverse calculation of design parameters". By simultaneously inputting the total target compression and total target reaction force into the model, the three key design parameters of contact area, initial thickness and working compression ratio are systematically calculated in reverse. Thus, the optimal solution is determined in digital space before manufacturing and assembly, which greatly saves development time and cost.

[0027] This method enables the quantitative constraint boundary definition of the clamping force parameters during the initial structural design phase, effectively mitigating the risk of cell surface deformation due to excessive contact stress while ensuring cell clamping stability. Furthermore, the multi-dimensional parameter optimization scheme output by this model provides crucial data support for the structural selection of the cell buffer strip and the matching of the mechanical properties of the foam. The implementation of this technical solution significantly improves the structural adaptability of CTP battery pack system integration design. By replacing traditional trial-and-error debugging with theoretical calculations, the system verification cycle is shortened, while reducing secondary development costs caused by parameter mismatch, comprehensively improving the engineering development efficiency and product reliability of power batteries.

[0028] In some preferred embodiments, a piecewise linear mechanical model characterizing the nonlinear compression behavior of the compressible component is established, specifically including the following steps: Obtain the stress-strain relationship for the elastic segment, the plateau segment, and the densification segment; The stress-strain relationships of the elastic segment, the plateau segment, and the densification segment are transformed into relationships representing the force and compression, respectively, to obtain the mechanical models of the elastic segment, the plateau segment, and the densification segment. The mechanical models of the elastic segment, the plateau segment, and the densification segment are then combined to form a piecewise linear mechanical model.

[0029] The stress-strain relationship of the elastic segment described above is: σ=E1· Where E1 is the elastic modulus. The stress-strain relationship of the platform segment is: (σ≈ ) The stress-strain relationship in the densified section is: σ = · ; The piecewise linear mechanical model is: F= ; Where σ is the stress, and Let A be the contact area, and let A be the strain. The elastic modulus of the elastic segment. For the stress of the platform segment, For the elastic modulus of the dense segment, For the initial thickness, For a single target compression amount, This is the elastic limit displacement. The initial displacement for densification.

[0030] In this embodiment, the arbitrariness of selecting model parameters based on intuition is avoided, ensuring the accuracy of the model input. It does not view a particular stage in isolation, but rather seamlessly connects the models of the three stages to form a unified and continuous computational tool that can describe the entire process from initial contact to complete crushing, thereby handling the various complex compression states that the foam may experience during the packing process.

[0031] In existing technologies, simple linear models completely fail to describe the core plateau segment of foam—the characteristic of essentially constant stress during significant compression. Using a linear model, the calculated force is severely underestimated in the early stages of compression and severely overestimated in the later stages, leading to complete distortion of the clamping force calculation, resulting in either failure to clamp or damage to the battery cell. In contrast, complex continuous nonlinear models, while capable of fitting with extremely high accuracy, suffer from complex mathematical forms (such as high-order polynomials and exponential forms), numerous parameters, and difficulty in obtaining them through simple experiments.

[0032] In this application, the piecewise linear model has the following advantages: It accurately captures the three physical stages of foam deformation: Elastic segment: Simulates the linear response of initial contact.

[0033] Platform segment: Core contribution, simulating borehole wall buckling and collapse, providing stable reaction force.

[0034] Densification section: Simulates the compression of a material entity, causing a sharp increase in stress.

[0035] It describes highly nonlinear physical processes in the simplest linear way, ensuring physical fidelity while avoiding excessive complexity.

[0036] This model provides a direct theoretical basis for achieving a "stable clamp" and safety early warning; it is not only for calculation, but also for design and control.

[0037] Platform segment → Achieves stable clamping; the existence of the platform segment means there is a stable clamping force window. During this stage, even if there are minor dimensional tolerances in the battery module (causing slight variations in compression Δh), the clamping force remains almost constant. This provides significant tolerance for errors in the assembly process, ensuring the reliability and consistency of the clamping process, which is impossible to achieve with a simple linear model.

[0038] The densification stage provides a safety warning; it acts as a hard stop or alarm. The model clearly indicates the densification initiation point Δh2. During the design phase, we can proactively ensure that the operating compression is far from the densification stage through calculations, thereby fundamentally avoiding cell damage caused by over-compression. It quantifies the safety boundary.

[0039] Achieving an optimal balance between computational complexity and engineering practicality, the model consists of simple linear equations, resulting in extremely fast computation. This makes it ideal for rapid iterative optimization and parameter scanning in design software, and also facilitates embedding into production line control systems. In contrast, complex nonlinear models involve large computational costs and are difficult to iterate rapidly.

[0040] The descriptive model is transformed into a design tool; the true power of the piecewise linear model lies in its reverse application. That is, given a target force (clamping force safety range) and a target displacement (remaining space), the required contact area and initial thickness can be deduced using the model. This ability to design inversely is the fundamental reason why this invention replaces the traditional trial-and-error method.

[0041] In some preferred embodiments, the total target compression is distributed to the end plate foam and multiple cell adhesive strips to obtain a single target compression for each compressible component; The total target reaction force is distributed to the end plate foam and the cell adhesive strip to obtain the individual target reaction force required for each compressible component; For each compressible component, its corresponding single target compression amount and single target reaction force are used, and the corresponding contact area, initial thickness and working compression ratio are solved by combining a piecewise linear mechanical model.

[0042] In this embodiment, a complex system design objective involving multiple irregularly shaped components (endplate foam, multiple battery cell adhesive strips) and interconnected components is decomposed into independent and clearly defined sub-objectives for each component (individual objective compression and individual objective reaction force). This decomposition strategy allows designers to flexibly allocate components based on preliminary experience or proportional principles, reducing the dimensionality of the system-level multivariate optimization problem. Engineers or computational programs can concurrently call the same piecewise linear mechanical model for each endplate foam and each battery cell adhesive strip, but input their respective assigned sub-objectives for solution. This method greatly simplifies the computational logic, avoids solving a large and coupled set of nonlinear equations, and makes the calculation method easy to implement and run on conventional computers, possessing strong engineering practical value.

[0043] In some preferred embodiments, calculating the contact area, initial thickness, and working compression ratio of a compressible component specifically includes the following steps: Using the piecewise linear mechanical model as a solver, the single target compression of the current compressible component as the model input, and with the output reaction force calculated by the piecewise linear mechanical model being equal to the single target reaction force as a condition, a set of equations about the contact area and the initial thickness are established. Solve the system of equations to calculate the contact area and initial thickness that meet the conditions, and determine the working compression ratio based on the compression amount and initial thickness.

[0044] This embodiment clearly reveals the mathematical essence of inversion solution, that is, by establishing and solving a system of equations with contact area and initial thickness as unknowns, the preset mechanical performance target can be accurately achieved, thereby transforming the engineering design problem into a mathematical problem with a definite solution.

[0045] It clearly states that the solution process is not based on empirical guesses or iterative calculations, but on rigorous mathematical solutions. Specifically, for any component, given a single target compression and a single target reaction force, these are substituted into the aforementioned function. Since there is a mathematical relationship between F, Δh, A, and h0 determined by the model, the only unknowns in the equations are A and h0. The system determines the mechanical stage (elastic, plateau, or densification) that the target compression might fall into, selects the corresponding force-compression formula, and thus establishes one or a set of equations with A and h0 as variables. Solving these equations means directly calculating the numerical solutions for A and h0 that satisfy the equations using numerical or analytical methods.

[0046] In some preferred embodiments, obtaining the remaining space specifically includes the following steps: Obtain the internal length dimensions of the battery pack housing, the number of cells in a single row of battery modules, the thickness of a single cell, and the thickness of the end plate; The remaining space is calculated using the formula for calculating the remaining length, combined with the internal length dimensions of the battery pack housing, the number of cells in a single row of battery modules, the thickness of a single cell, and the thickness of the end plate.

[0047] In some preferred embodiments, the formula for calculating the remaining length is: L 剩余 =L 箱体 -n 电芯 *A 电芯 -2*A 端板 =2*h ’ 泡棉 +(n-1)*h ’ 胶条 ; Where L 箱体 Let n be the length inside the box. 电芯 A represents the number of cells in a single-row battery module. 电芯 For cell thickness, A 端板 h is the end plate thickness. ’ 泡棉 h represents the thickness of the end plate foam in the compressed state. ’ 胶条 The thickness of the battery cell adhesive strip in the compressed state.

[0048] The complex geometric assembly relationships within the battery pack are condensed into a concise and definite mathematical formula, providing a precise and unshakeable spatial dimensional boundary for the entire calculation method. This is the foundation for achieving interference fit design. The equivalence relationship between this space and the final state of the compressible component is clarified. Establishing these two equations transforms the fuzzy engineering problem of whether assembly is successful into the explicit mathematical condition that the total thickness after compression equals L_remaining. This provides a constant and mandatory geometric boundary for the entire inversion calculation, ensuring that the Block can be smoothly pressed into the housing and form a stable interference fit.

[0049] In some preferred embodiments, calculating the safe range of clamping force applied by the clamping mechanism during the pressing of the battery module into the battery pack housing specifically includes the following steps: Obtain the physical parameters and material performance parameters of the battery module. The physical parameters include the mass of the battery module and the static friction coefficient of the contact surface between the clamping mechanism and the battery module. The material performance parameters include the yield strength of the cell shell and the adhesive area of ​​the cell adhesive strip. Based on the mass of the battery module and the static friction coefficient, and with the minimum clamping force being equal to twice the weight of the battery module and the static friction coefficient, the minimum clamping force required to ensure that the battery module does not slip during clamping is calculated. Based on the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, and with the maximum clamping force equal to the product of the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, the maximum clamping force is calculated to ensure that the battery cell housing does not undergo plastic deformation during clamping. The minimum clamping force and the maximum clamping force are used to define the safe range of clamping force.

[0050] Considering the safety factor, the static friction force of the grippers should be at least twice the weight of the object. However, excessive clamping force can damage the battery cell casing; therefore, the clamping force must be less than the yield strength of the battery cell casing.

[0051] 2mg / μs≤F clip≤σ cell·A tampon m is the mass of the battery module, g is the acceleration due to gravity, μs is the static friction coefficient (depending on the contact surface material between the gripper and the object), F is the clamping force of the battery module when it enters the box, σ is the yield strength of the battery cell shell, and A is the adhesive area of ​​the battery cell adhesive strip.

[0052] Secondly, a system for calculating parameters of compressible components in a battery storage box is provided, comprising: The constraint determination module is used to obtain the safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack box, as well as the remaining space after the battery module is put into the box; the remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or cell adhesive strips; The mechanical model module is used to establish a piecewise linear mechanical model that characterizes the nonlinear compression behavior of compressible components; the piecewise linear mechanical model includes an elastic segment mechanical model, a plateau segment mechanical model, and a densification segment mechanical model for characterizing force and compression. The parameter solving module is used to take the remaining space as the total target compression amount of the compressible component and the target value of the clamping force safety range as the total target reaction force. Through the piecewise linear mechanical model, the contact area, initial thickness and working compression ratio of the compressible component are jointly solved by inversion.

[0053] The functions of each module in the above-mentioned battery box compressible component parameter calculation device correspond to the steps in the above-mentioned battery box compressible component parameter calculation method embodiment, and their functions and implementation processes will not be described in detail here.

[0054] Thirdly, embodiments of this application provide a device for calculating the parameters of compressible components in a battery box. This device can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0055] In this embodiment of the application, the device for measuring the parameters of compressible components in the battery box may include a processor, a memory, a communication interface, and a communication bus.

[0056] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0057] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces. These interfaces enable interconnection of devices within the battery compartment's compressible component parameter measurement device, and also enable interconnection between the device and other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0058] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0059] The processor can be a general-purpose processor, which can call the parameter calculation program for the compressible components in the battery compartment stored in the memory and execute the parameter calculation method for the compressible components in the battery compartment provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the parameter calculation program for the compressible components in the battery compartment is called can refer to the various embodiments of the parameter calculation method for the compressible components in the battery compartment of this application, and will not be repeated here.

[0060] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0061] The present application stores a program for calculating the parameters of compressible components in a battery case on a computer-readable storage medium. When the program is executed by a processor, it implements the steps of the method for calculating the parameters of compressible components in a battery case as described above.

[0062] The method implemented when the battery pack compressible component parameter calculation program is executed can refer to the various embodiments of the battery pack compressible component parameter calculation method of this application, and will not be repeated here.

[0063] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0064] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0065] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0066] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0067] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0068] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0069] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for calculating parameters of compressible components in a battery case, characterized in that, It includes: The safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack box is obtained, as well as the remaining space after the battery module is put into the box; The remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or battery cell adhesive strips; A piecewise linear mechanical model is established to characterize the nonlinear compression behavior of compressible components; the piecewise linear mechanical model includes an elastic segment mechanical model, a plateau segment mechanical model, and a densification segment mechanical model to characterize force and compression. The remaining space is taken as the total target compression amount of the compressible component, and the target value of the clamping force safety range is taken as the total target reaction force. The contact area, initial thickness and working compression ratio of the compressible component are solved by joint inversion through the piecewise linear mechanical model.

2. The method for calculating the parameters of compressible components in a battery box as described in claim 1, characterized in that, Establishing a piecewise linear mechanical model characterizing the nonlinear compression behavior of a compressible component includes the following steps: Obtain the stress-strain relationship for the elastic segment, the plateau segment, and the densification segment; The stress-strain relationships of the elastic segment, the plateau segment, and the densification segment are transformed into relationships representing the force and compression, respectively, to obtain the mechanical models of the elastic segment, the plateau segment, and the densification segment. The mechanical models of the elastic segment, the plateau segment, and the densification segment are then combined to form a piecewise linear mechanical model.

3. The method for calculating the parameters of compressible components in a battery box as described in claim 2, characterized in that: The stress-strain relationship of the elastic segment is: σ=E1· Where E1 is the elastic modulus. The stress-strain relationship of the platform segment is: (σ≈ ) The stress-strain relationship in the densified section is: σ = · ; The piecewise linear mechanical model is: F= ; Where σ is the stress, and Let A be the contact area, and let A be the strain. The elastic modulus of the elastic segment. For the stress of the platform segment, For the elastic modulus of the dense segment, For the initial thickness, For a single target compression amount, This is the elastic limit displacement. The initial displacement for densification.

4. The method for calculating the parameters of compressible components in a battery box as described in claim 1, characterized in that, The steps to determine the contact area, initial thickness, and working compression ratio of the compressible component are as follows: The total target compression amount is allocated to the end plate foam and multiple cell adhesive strips to obtain a single target compression amount for each compressible component; The total target reaction force is distributed to the end plate foam and the cell adhesive strip to obtain the individual target reaction force required for each compressible component; For each compressible component, its corresponding single target compression amount and single target reaction force are used, and the corresponding contact area, initial thickness and working compression ratio are solved by combining a piecewise linear mechanical model.

5. The method for calculating the parameters of compressible components in a battery box as described in claim 4, characterized in that, Calculating the contact area, initial thickness, and working compression ratio of a compressible component involves the following steps: Using the piecewise linear mechanical model as a solver, the single target compression of the current compressible component as the model input, and with the output reaction force calculated by the piecewise linear mechanical model being equal to the single target reaction force as a condition, a set of equations about the contact area and the initial thickness are established. Solve the system of equations to calculate the contact area and initial thickness that meet the conditions, and determine the working compression ratio based on the compression amount and initial thickness.

6. The method for calculating the parameters of compressible components in a battery box as described in claim 5, characterized in that, Obtaining the remaining space specifically includes the following steps: Obtain the internal length dimensions of the battery pack housing, the number of cells in a single row of battery modules, the thickness of a single cell, and the thickness of the end plate; The remaining space is calculated using the formula for calculating the remaining length, combined with the internal length dimensions of the battery pack housing, the number of cells in a single row of battery modules, the thickness of a single cell, and the thickness of the end plate.

7. The method for calculating the parameters of compressible components in a battery box as described in claim 6, characterized in that: The formula for calculating the remaining length is: L 剩余 =L 箱体 -n 电芯 *A 电芯 -2*A 端板 =2*h ’ 泡棉 +(n-1)*h ’ 胶条 ; Where L 箱体 Let n be the length inside the box. 电芯 A represents the number of cells in a single-row battery module. 电芯 For cell thickness, A 端板 h is the end plate thickness. ’ 泡棉 h represents the thickness of the end plate foam in the compressed state. ’ 胶条 The thickness of the battery cell adhesive strip in the compressed state.

8. The method for calculating the parameters of compressible components in a battery box as described in claim 1, characterized in that, The safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack housing is calculated, specifically including the following steps: Obtain the physical parameters and material performance parameters of the battery module. The physical parameters include the mass of the battery module and the static friction coefficient of the contact surface between the clamping mechanism and the battery module. The material performance parameters include the yield strength of the cell shell and the adhesive area of ​​the cell adhesive strip. Based on the mass of the battery module and the static friction coefficient, and with the minimum clamping force being equal to twice the weight of the battery module and the static friction coefficient, the minimum clamping force required to ensure that the battery module does not slip during clamping is calculated. Based on the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, and with the maximum clamping force equal to the product of the yield strength of the battery cell housing and the adhesive area of ​​the battery cell adhesive strip, the maximum clamping force is calculated to ensure that the battery cell housing does not undergo plastic deformation during clamping. The minimum clamping force and the maximum clamping force are used to define the safe range of clamping force.

9. A system for calculating parameters of compressible components in a battery case, characterized in that, It includes: The constraint determination module is used to obtain the safe range of clamping force applied by the clamping mechanism during the process of pressing the battery module into the battery pack box, as well as the remaining space after the battery module is put into the box; the remaining space is equal to the sum of the thicknesses of all compressible components in the compressed state; the compressible components include end plate foam and / or cell adhesive strips; The mechanical model module is used to establish a piecewise linear mechanical model that characterizes the nonlinear compression behavior of compressible components; the piecewise linear mechanical model includes an elastic segment mechanical model, a plateau segment mechanical model, and a densification segment mechanical model for characterizing force and compression. The parameter solving module is used to take the remaining space as the total target compression amount of the compressible component and the target value of the clamping force safety range as the total target reaction force. Through the piecewise linear mechanical model, the contact area, initial thickness and working compression ratio of the compressible component are jointly solved by inversion.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program for calculating the parameters of compressible components in a battery compartment, wherein when the program is executed by a processor, it implements the steps of the method for calculating the parameters of compressible components in a battery compartment as described in any one of claims 1 to 8.

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