Battery expansion force calculation method and device, storage medium, electronic device and program product
By constructing a battery expansion force calculation model and using historical data to predict battery expansion force, the problem of insufficient measurement accuracy in existing technologies is solved, enabling rapid and accurate estimation under extreme conditions and reducing safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2026-02-10
- Publication Date
- 2026-05-12
AI Technical Summary
Existing technologies lack sufficient accuracy in measuring battery expansion force, especially under extreme temperatures and high-load cycling conditions, making it difficult to capture dynamic changes in real time and accurately, resulting in the inability to provide early warnings of safety risks.
By constructing a battery expansion force calculation model, and utilizing the correspondence between historical thickness parameters, gas production, and battery expansion force, combined with the battery's initial pre-tightening force, the current thickness parameters and gas production are calculated to predict the target battery expansion force.
It enables rapid and accurate estimation of battery expansion force under extreme conditions, improving the accuracy and reliability of measurements and reducing safety risks.
Smart Images
Figure CN122017591A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of battery expansion force prediction, and more specifically, to a method, apparatus, storage medium, electronic device, and program product for calculating battery expansion force. Background Technology
[0002] Throughout the development of lithium battery technology, the monitoring and control of expansion force has been a key factor in ensuring battery safety and extending its lifespan. Currently, expansion force is primarily measured using direct physical methods, such as attaching precise strain gauges to the battery casing to capture minute deformations, embedding piezoresistive flexible sensors inside the battery to sense pressure changes, or employing advanced optical / digital imaging technology to observe dynamic changes in battery dimensions. However, physical measurement methods have long testing cycles, and their accuracy is severely limited by stringent testing conditions. Even slight environmental fluctuations (such as temperature and humidity) can lead to data deviations, significantly affecting the stability and reliability of expansion force assessment. Under extreme temperature and high-load cycling conditions, physical measurement methods struggle to capture these dynamically changing expansion forces in real time and accurately, thus failing to anticipate potential safety risks such as separator damage and internal short circuits. Therefore, the technical challenge in related technologies is how to improve the accuracy of battery expansion force measurement.
[0003] Regarding the technical problem of improving the accuracy of battery expansion force measurement in related technologies, no effective solution has yet been proposed. Summary of the Invention
[0004] This application provides a method, apparatus, storage medium, electronic device, and program product for calculating battery expansion force, to at least solve the technical problem of how to improve the measurement accuracy of battery expansion force in related technologies.
[0005] According to one embodiment of this application, a method for calculating battery expansion force is provided, comprising: determining historical operating condition parameters of the battery during operation, wherein the historical operating condition parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force; constructing a battery expansion force calculation model based on the correspondence between the historical thickness parameters, the historical gas production, and the historical battery expansion force; and using the battery expansion force calculation model to calculate the current thickness parameters and the current gas production to obtain the target battery expansion force.
[0006] In an exemplary embodiment, constructing a battery expansion force calculation model based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force includes: determining a first function corresponding to the historical thickness parameter and determining a second function corresponding to the historical gas production, wherein the first function is used to characterize a first correspondence between the historical thickness parameter and the historical battery expansion force, and the second function is used to characterize a second correspondence between the historical gas production and the historical battery expansion force; and obtaining the battery expansion force calculation model using the first function and the second function.
[0007] In an exemplary embodiment, the historical operating condition parameters further include: the initial preload of the battery. The battery expansion force calculation model is obtained using the first function and the second function, including: determining the function constant term corresponding to the initial preload of the battery; and obtaining the battery expansion force calculation model based on the first function, the second function, and the function constant term.
[0008] In an exemplary embodiment, the first function is f(1) = k1 × THK, and the second function is f(2) = k2 × Gas, where k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical gas production.
[0009] In an exemplary embodiment, the current thickness parameter includes at least the current storage hardness. Before calculating the target battery expansion force by using the battery expansion force calculation model to calculate the current thickness parameter and the current gas production, the method further includes: obtaining first operating data for calculating the current storage hardness from the current operating data of the battery; and calculating the first operating data using a first calculation formula to obtain the current storage hardness.
[0010] In an exemplary embodiment, the first calculation formula is THKs=A×k3exp(SOC)×exp(-k4 / (273.15+T))×t+b1, where THKs represents the current storage hardness, A is a constant, k3 is the SOC coefficient, SOC is the current charge state, k4 is the temperature coefficient, T is the temperature, t is the storage time, and b1 is a constant.
[0011] In an exemplary embodiment, the current thickness parameter further includes the current cycle hardness. Before calculating the target battery expansion force by using the battery expansion force calculation model to calculate the current thickness parameter and the current gas production, the method further includes: obtaining second operating data for calculating the cycle hardness from the current operating data of the battery; calculating the second operating data using a second calculation formula to obtain the current cycle hardness; and determining the current thickness parameter based on the current storage hardness and the current cycle hardness.
[0012] In an exemplary embodiment, the second calculation formula is: THKc=B×k5exp(DOD)×k6exp(Drate)×exp(-k7 / (273.15+T))×N+b2, where THKc is the current cycle hardness, B is a constant, DOD is the depth of discharge, Drate is the discharge rate, k5 is the DOD coefficient, k6 is the discharge rate coefficient, k7 is the temperature coefficient, T is the temperature, N is the number of cycles, and b2 is a constant.
[0013] In an exemplary embodiment, before using the battery expansion force calculation model to calculate the current thickness parameter and the current gas production amount to obtain the target battery expansion force, the method further includes: obtaining third operating data from the current operating data of the battery for calculating the gas production parameter, wherein the gas production parameter includes the gas production amount; and using a third calculation formula corresponding to the gas production amount to calculate the third operating data to obtain the current gas production amount.
[0014] In an exemplary embodiment, the target battery expansion force is obtained by calculating the current thickness parameter and the current gas production using the battery expansion force calculation model, including: determining the objective function corresponding to the battery expansion force calculation model, wherein the objective function includes at least a first function corresponding to the historical thickness parameter, a second function corresponding to the historical gas production, and a function constant term corresponding to the initial battery preload; calculating the first battery expansion force using the first function to obtain the current thickness parameter; calculating the second battery expansion force using the second function to obtain the current gas production; and obtaining the target battery expansion force based on the sum of the first battery expansion force, the second battery expansion force, and the initial battery preload.
[0015] According to another aspect of the embodiments of this application, a battery expansion force calculation device is also provided, comprising: a determining module, configured to determine historical operating condition parameters of the battery during operation, wherein the historical operating condition parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force; a constructing module, configured to construct a battery expansion force calculation model based on the correspondence between the historical thickness parameters, the historical gas production, and the historical battery expansion force; and a obtaining module, configured to use the battery expansion force calculation model to calculate the current thickness parameters and the current gas production to obtain the target battery expansion force.
[0016] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer program, and the computer program is configured to execute the above-described method for calculating battery expansion force when it is run.
[0017] According to another aspect of the embodiments of this application, an electronic device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the above-described method for calculating battery expansion force through the computer program.
[0018] According to another aspect of the embodiments of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the above-described method for calculating battery expansion force.
[0019] In this embodiment, historical operating condition parameters of the battery are determined, including at least historical thickness parameters, historical gas production, and historical battery expansion force. A battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameters, historical gas production, and historical battery expansion force. The battery expansion force calculation model is used to calculate the current thickness parameters and current gas production to obtain the target battery expansion force. This embodiment collects historical operating condition parameters such as historical thickness parameters, historical gas production, and historical battery expansion force during battery operation to construct a battery expansion force calculation model. Using this model based on existing historical data, the expansion force performance of the battery under similar operating conditions in the future is predicted. This overcomes the limitations of relying on physical contact measurement and solves the technical problem of how to improve the measurement accuracy of battery expansion force in related technologies. It can quickly and accurately estimate the battery expansion force, thereby improving the measurement accuracy and reliability of battery expansion force. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram illustrating the influencing factors of battery expansion force according to an embodiment of this application;
[0023] Figure 2 This is a flowchart of a method for calculating battery expansion force according to an embodiment of this application;
[0024] Figure 3 This is a structural block diagram of a battery expansion force calculation device according to an embodiment of this application. Detailed Implementation
[0025] 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 should fall within the scope of protection of the present application.
[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0027] The following appropriately discloses an embodiment of a battery according to this application. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the following description is provided to enable those skilled in the art to fully understand this application and is not intended to limit the subject matter of the claims.
[0028] The battery in this application is a secondary battery, also known as a rechargeable battery or storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.
[0029] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.
[0030] During the lifespan of a lithium battery, the formation and development of expansion force is a complex process, underpinned by numerous intertwined influencing mechanisms. For example... Figure 1As shown, cell aging expansion and the battery's spatial structure are the two core factors contributing to expansion force. These factors work together within the battery to determine its safety and stability at different stages of use. Specifically, cell aging expansion can be subdivided into two types: hard expansion and soft expansion. Hard expansion is primarily driven by the relaxation effect of pre-stress, involving factors such as the compaction degree of the cell material, the initial pre-tightening force setting, and temperature changes and depth of discharge (DOD) experienced during use and aging. Soft expansion is closely related to the battery's chemical system. During charging and discharging, gases such as hydrogen, oxygen, and carbon monoxide are generated inside the cell due to electrolyte decomposition and side reactions of the positive and negative electrode materials. The accumulation of these gases leads to soft expansion. Furthermore, the battery's spatial structure (including group margin, area, and number of layers) also has a significant impact on expansion force.
[0031] This application emphasizes a method for calculating expansion force from the perspectives of soft expansion (internal gas pressure) and hard expansion (electrode bulging: rebound + by-product accumulation), as detailed below. This embodiment provides a method for calculating battery expansion force. Figure 2 This is a flowchart of a method for calculating battery expansion force according to an embodiment of this application. The process includes the following steps:
[0032] Step S202: Determine the historical operating parameters of the battery during operation, wherein the historical operating parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force.
[0033] Optionally, battery operating parameters include measured expansion force, gas production, battery core thickness, and state of equilibrium (SOH). Some operating parameters are provided in Table 1.
[0034] Table 1
[0035]
[0036] Step S204: Construct a battery expansion force calculation model based on the correspondence between the historical thickness parameters, the historical gas production, and the historical battery expansion force;
[0037] Step S206: Use the battery expansion force calculation model to calculate the current thickness parameters and current gas production to obtain the target battery expansion force.
[0038] Through the above steps, historical operating condition parameters of the battery are determined. These historical operating condition parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force. A battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameters, historical gas production, and historical battery expansion force. The battery expansion force calculation model is used to calculate the current thickness parameters and current gas production to obtain the target battery expansion force. This embodiment collects historical operating condition parameters such as historical thickness parameters, historical gas production, and historical battery expansion force during battery operation to construct a battery expansion force calculation model. Using this model based on existing historical data, the expansion force performance of the battery under similar operating conditions in the future is predicted. This overcomes the limitations of relying on physical contact measurement and solves the technical problem of how to improve the measurement accuracy of battery expansion force in related technologies. It can quickly and accurately estimate the battery expansion force, thereby improving the measurement accuracy and reliability of battery expansion force.
[0039] In an exemplary embodiment, a battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force. This includes: determining a first function corresponding to the historical thickness parameter and a second function corresponding to the historical gas production, wherein the first function characterizes a first correspondence between the historical thickness parameter and the historical battery expansion force, and the second function characterizes a second correspondence between the historical gas production and the historical battery expansion force; and obtaining the battery expansion force calculation model using the first and second functions. This embodiment provides a solid mathematical foundation for the expansion force calculation model by determining the first functional relationship between the historical thickness parameter and the historical battery expansion force, and the second functional relationship between the historical gas production and the historical battery expansion force. These two functions independently reflect the influence of battery thickness and gas production on the expansion force. By combining these two functions, the battery expansion force calculation model can more comprehensively consider the complex mechanical behavior of the battery under different operating conditions, improving the prediction accuracy of the battery expansion force calculation model.
[0040] In an exemplary embodiment, the historical operating condition parameters further include: the initial preload of the battery. The battery expansion force calculation model is obtained using the first function and the second function, including: determining the function constant term corresponding to the initial preload of the battery; and obtaining the battery expansion force calculation model based on the first function, the second function, and the function constant term. By introducing the initial preload of the battery as an important parameter of the model, this embodiment enhances the generalization ability of the calculation model. Specifically, by determining the function constant term corresponding to the preload, and combining it with the first function of historical thickness parameters and the second function of historical gas production, an expansion force calculation model that considers the initial state of the battery is finally constructed. This allows the model to more accurately reflect the expansion force change trend of the battery at different stages of its life cycle, thereby facilitating the prediction and management of battery expansion risks.
[0041] In an exemplary embodiment, the first function is f(1) = k1 × THK, and the second function is f(2) = k2 × Gas, where k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical gas production.
[0042] Specifically, when the first function is set as f(1) = k1 × THK and the second function is set as f(2) = k2 × Gas, the construction process of the battery expansion force calculation model can be explained more intuitively, simplifying the complexity of the model. Among them, k1 and k2 are constants determined by experimental data, representing the linear contribution of thickness parameter and gas production to battery expansion force, respectively.
[0043] Optionally, the battery expansion force calculation model is expressed as F = k1 × THK + k2 × Gas + F0. Here, F0 represents the function constant term corresponding to the initial preload of the battery.
[0044] In one exemplary embodiment, the current thickness parameter includes at least the current storage hardness. Before calculating the target battery expansion force using the battery expansion force calculation model on the current thickness parameter and the current gas production, the method further includes: obtaining first operating data from the battery's current operating data for calculating the current storage hardness; and calculating the first operating data using a first calculation formula to obtain the current storage hardness. Considering the characteristics of the battery during storage, this embodiment further calculates the current storage hardness as an important component of the current thickness parameter. Specifically, it extracts the first operating data from the battery's current operating data and applies a specific first calculation formula to calculate the first operating data, accurately obtaining the current storage hardness and providing more detailed information for subsequent expansion force prediction.
[0045] In an exemplary embodiment, the first calculation formula is THKs = A × k3exp(SOC) × exp(-k4 / (273.15+T)) × t + b1, where THKs represents the current storage hardness. The first operating data and related meanings of the current storage hardness are as follows: A is a constant, k3 is the SOC coefficient, SOC is the current state of charge, k4 is the temperature coefficient, T is the temperature, t is the storage time, and b1 is a constant. Here, k3 and k4 respectively consider the influence of the state of charge (SOC) and temperature (T) on the storage hardness. This formula can meticulously reflect the potential impact of storage conditions on battery expansion force, making the model's prediction results more accurate and helping to avoid expansion risks caused by storage during battery design and maintenance.
[0046] In an exemplary embodiment, the current thickness parameter further includes the current cycle hardness. Before calculating the target battery expansion force using the battery expansion force calculation model on the current thickness parameter and the current gas production, the method further includes: obtaining second operating data for calculating the cycle hardness from the battery's current operating data; calculating the second operating data using a second calculation formula to obtain the current cycle hardness; and determining the current thickness parameter based on the current storage hardness and the current cycle hardness. By introducing the concept of current cycle hardness, this embodiment further enriches the connotation of the current thickness parameter. This embodiment combines the calculated current cycle hardness with the current storage hardness to form a more comprehensive current thickness parameter, which helps the model more accurately predict the changes in expansion force during cyclic use.
[0047] To better understand the first calculation formula above, the following description will be provided in conjunction with optional embodiments, but these are not intended to limit the technical solutions of the embodiments of this application.
[0048] In an exemplary embodiment, the second calculation formula is: THKc = B × k5exp(DOD) × k6exp(Drate) × exp(-k7 / (273.15+T)) × N + b2, where THKc is the current cycle hardness, and the second operating data and related meanings are: B is a constant, DOD is the depth of discharge, Drate is the discharge rate, k5 is the DOD coefficient, k6 is the discharge rate coefficient, k7 is the temperature coefficient, T is the temperature, N is the number of cycles, and b2 is a constant. Here, k5, k6, and k7 respectively consider the effects of depth of discharge, discharge rate, and temperature, which can meticulously reflect the impact of cyclic use on battery thickness changes and help to more accurately assess the battery's expansion force.
[0049] Optionally, the current thickness parameter THK, determined based on the current storage hardness and the current cycle hardness, can be expressed as THK = THKs + THKc.
[0050] In an exemplary embodiment, before calculating the target battery expansion force using the battery expansion force calculation model based on the current thickness parameter and the current gas production amount, the method further includes: obtaining third operating data from the battery's current operating data for calculating the gas production parameter; and calculating the third operating data using a third calculation formula corresponding to the gas production amount to obtain the current gas production amount. This embodiment focuses on the calculation process of the current gas production parameter. By obtaining the third operating data from the battery's current operating data and applying the third calculation formula corresponding to the gas production parameter, the current gas production amount can be accurately obtained, improving the comprehensiveness and accuracy of the model input and enhancing the understanding of the generation of gas inside the battery and its impact on expansion force.
[0051] Alternatively, the third calculation formula is expressed as:
[0052] Gas=a0×(1-soh)×exp(k / T)×exp(dod)×exp(D)×exp(SOC)+b3×lnt+c×lncycle+d.
[0053] Where a0, k, b3, c, and d are all constants that can be parameterized using experimental data, soh represents the current capacity retention rate of the battery, dod represents the depth of discharge, D represents the discharge rate, SOC represents the state of charge of the battery in the off-state state, T represents the cell temperature, t represents the battery usage time, and Cycle represents the number of cycles.
[0054] In an exemplary embodiment, the target battery expansion force is obtained by calculating the current thickness parameter and the current gas production using the battery expansion force calculation model. This includes: determining the objective function corresponding to the battery expansion force calculation model, wherein the objective function includes at least a first function corresponding to the historical thickness parameter, a second function corresponding to the historical gas production, and a function constant term corresponding to the initial battery preload; calculating the first battery expansion force using the first function to obtain the current thickness parameter; calculating the second battery expansion force using the second function to obtain the current gas production; and obtaining the target battery expansion force based on the sum of the first battery expansion force, the second battery expansion force, and the initial battery preload. This embodiment details the steps of obtaining the target battery expansion force using the battery expansion force calculation model. Specifically, by determining the objective function corresponding to the model, combining the first battery expansion force with the current thickness parameter, the second battery expansion force with the current gas production, and the initial battery preload, a comprehensive calculation of the expansion force is achieved. This method not only considers the current state of the battery but also incorporates its historical operating conditions, improving the accuracy of battery expansion force prediction.
[0055] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to 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) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of this application.
[0056] In one embodiment, such as Figure 3 As shown, an embodiment of this application provides a device for determining battery expansion force, comprising:
[0057] The determination module 32 is used to determine the historical operating condition parameters of the battery during operation, wherein the historical operating condition parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force;
[0058] Module 34 is used to construct a battery expansion force calculation model based on the correspondence between the historical thickness parameters, the historical gas production and the historical battery expansion force.
[0059] Module 36 is used to calculate the target battery expansion force by using the battery expansion force calculation model to calculate the current thickness parameters and the current gas production.
[0060] The aforementioned device determines historical operating condition parameters of the battery, including at least historical thickness parameters, historical gas production, and historical battery expansion force. A battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameters, historical gas production, and historical battery expansion force. The target battery expansion force is obtained by calculating the current thickness parameters and current gas production using the battery expansion force calculation model. This embodiment collects historical operating condition parameters such as historical thickness parameters, historical gas production, and historical battery expansion force during battery operation to construct a battery expansion force calculation model. Using this model based on existing historical data, it predicts the battery's expansion force performance under similar operating conditions in the future, overcoming the limitations of relying on physical contact measurements. This solves the technical problem of improving the accuracy of battery expansion force measurement in related technologies, enabling rapid and accurate estimation of battery expansion force, thereby improving the accuracy and reliability of battery expansion force measurement.
[0061] In an exemplary embodiment, the construction module is further configured to: determine a first function corresponding to the historical thickness parameter and a second function corresponding to the historical gas production, wherein the first function is used to characterize a first correspondence between the historical thickness parameter and the historical battery expansion force, and the second function is used to characterize a second correspondence between the historical gas production and the historical battery expansion force; and obtain the battery expansion force calculation model using the first function and the second function.
[0062] In an exemplary embodiment, the historical operating condition parameters further include: the battery initial preload force. The construction module is further configured to: determine the function constant term corresponding to the battery initial preload force; and obtain the battery expansion force calculation model based on the first function, the second function, and the function constant term.
[0063] In an exemplary embodiment, the first function is f(1) = k1 × THK, and the second function is f(2) = k2 × Gas, where k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical gas production.
[0064] In one exemplary embodiment, the current thickness parameter includes at least the current storage hardness. The module is further configured to: obtain first operating data for calculating the current storage hardness from the current operating data of the battery; and calculate the first operating data using a first calculation formula to obtain the current storage hardness.
[0065] In an exemplary embodiment, the first calculation formula is THKs=A×k3exp(SOC)×exp(-k4 / (273.15+T))×t+b1, where THKs represents the current storage hardness, A is a constant, k3 is the SOC coefficient, SOC is the current charge state, k4 is the temperature coefficient, T is the temperature, t is the storage time, and b1 is a constant.
[0066] In one exemplary embodiment, the current thickness parameter further includes a current cycle hardness. The module is further configured to: obtain second operating data for calculating cycle hardness from the current operating data of the battery; calculate the second operating data using a second calculation formula to obtain the current cycle hardness; and determine the current thickness parameter based on the current storage hardness and the current cycle hardness.
[0067] In an exemplary embodiment, the second calculation formula is: THKc=B×k5exp(DOD)×k6exp(Drate)×exp(-k7 / (273.15+T))×N+b2, where THKc is the current cycle hardness, B is a constant, DOD is the depth of discharge, Drate is the discharge rate, k5 is the DOD coefficient, k6 is the discharge rate coefficient, k7 is the temperature coefficient, T is the temperature, N is the number of cycles, and b2 is a constant.
[0068] In an exemplary embodiment, the obtaining module is further configured to: obtain third operating data for calculating the gas production parameters from the current operating data of the battery; and calculate the third operating data using a third calculation formula corresponding to the gas production amount to obtain the current gas production amount.
[0069] In an exemplary embodiment, the obtaining module is further configured to: determine an objective function corresponding to the battery expansion force calculation model, wherein the objective function includes at least a first function corresponding to the historical thickness parameter, a second function corresponding to the historical gas production, and a function constant term corresponding to the battery initial preload; calculate the current thickness parameter using the first function to obtain a first battery expansion force; calculate the current gas production using the second function to obtain a second battery expansion force; and obtain the target battery expansion force based on the sum of the first battery expansion force, the second battery expansion force, and the battery initial preload.
[0070] Embodiments of this application also provide a storage medium including a stored program, wherein the program executes any of the methods described above when it is run.
[0071] Optionally, in this embodiment, the storage medium may be configured to store program code for performing the following steps:
[0072] S1, determine the historical operating parameters of the battery during operation, wherein the historical operating parameters include at least: historical thickness parameters, historical gas production and historical battery expansion force;
[0073] S2, Construct a battery expansion force calculation model based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force;
[0074] S3, use the battery expansion force calculation model to calculate the current thickness parameters and current gas production to obtain the target battery expansion force.
[0075] Embodiments of this application also provide an electronic device including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.
[0076] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.
[0077] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program:
[0078] S1, determine the historical operating parameters of the battery during operation, wherein the historical operating parameters include at least: historical thickness parameters, historical gas production and historical battery expansion force;
[0079] S2, Construct a battery expansion force calculation model based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force;
[0080] S3, use the battery expansion force calculation model to calculate the current thickness parameters and current gas production to obtain the target battery expansion force.
[0081] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.
[0082] Optionally, embodiments of this application also provide a computer program product, which includes a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.
[0083] Optionally, embodiments of this application also provide another computer program product, including a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.
[0084] Optionally, embodiments of this application also provide a computer program, which includes computer instructions stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps in any of the above method embodiments.
[0085] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.
[0086] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuits, or multiple modules or steps can be fabricated as a single integrated circuit. Thus, this application is not limited to any particular hardware and software combination.
[0087] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A method for calculating battery expansion force, characterized in that, At least including: Determine the historical operating parameters of the battery during operation, wherein the historical operating parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force; A battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force. The target battery expansion force is obtained by calculating the current thickness parameters and current gas production using the battery expansion force calculation model.
2. The method for calculating battery expansion force according to claim 1, characterized in that, A battery expansion force calculation model is constructed based on the correspondence between the historical thickness parameter, the historical gas production, and the historical battery expansion force, including: A first function corresponding to the historical thickness parameter and a second function corresponding to the historical gas production are determined, wherein the first function is used to characterize a first correspondence between the historical thickness parameter and the historical battery expansion force, and the second function is used to characterize a second correspondence between the historical gas production and the historical battery expansion force; The battery expansion force calculation model is obtained using the first function and the second function.
3. The method for calculating battery expansion force according to claim 2, characterized in that, The historical operating condition parameters also include: the initial preload of the battery, and the calculation model for the battery expansion force obtained using the first function and the second function, including: Determine the function constant term corresponding to the initial preload of the battery; The battery expansion force calculation model is obtained based on the first function, the second function, and the function constant term.
4. The method for calculating battery expansion force according to claim 3, characterized in that, The first function is f(1)=k1×THK, and the second function is f(2)=k2×Gas, where k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical gas production.
5. The method for calculating battery expansion force according to claim 1, characterized in that, The current thickness parameter includes at least the current storage hardness. Before calculating the target battery expansion force using the battery expansion force calculation model based on the current thickness parameter and the current gas production, the method further includes: Obtain first operating data from the current operating data of the battery to calculate the current storage hardness; The first operating data is calculated using the first calculation formula to obtain the current storage hardness.
6. The method for calculating battery expansion force according to claim 5, characterized in that, The first calculation formula is THKs=A×k3exp(SOC)×exp(-k4 / (273.15+T))×t+b1, where THKs represents the current storage hardness, A is a constant, k3 is the SOC coefficient, SOC is the current charge state, k4 is the temperature coefficient, T is the temperature, t is the storage time, and b1 is a constant.
7. The method for calculating battery expansion force according to claim 5 or 6, characterized in that, The current thickness parameter also includes the current cycle hardness. Before using the battery expansion force calculation model to calculate the target battery expansion force based on the current thickness parameter and the current gas production, the method further includes: Obtain second operating data from the current operating data of the battery to calculate cycle hardness; The second running data is calculated using the second calculation formula to obtain the current cycle hardness; The current thickness parameter is determined based on the current storage hardness and the current cycle hardness.
8. The method for calculating battery expansion force according to claim 7, characterized in that, The second calculation formula is: THKc=B×k5exp(DOD)×k6exp(Drate)×exp(-k7 / (273.15+T))×N+b2, where THKc is the current cycle hardness, B is a constant, DOD is the depth of discharge, Drate is the discharge rate, k5 is the DOD coefficient, k6 is the discharge rate coefficient, k7 is the temperature coefficient, T is the temperature, N is the number of cycles, and b2 is a constant.
9. The method for calculating battery expansion force according to claim 1, characterized in that, Before using the battery expansion force calculation model to calculate the target battery expansion force based on the current thickness parameters and current gas production, the method further includes: Obtain third operating data from the current operating data of the battery for calculating gas production parameters, wherein the gas production parameters include gas production amount; The current gas production is obtained by calculating the third operating data using the third calculation formula corresponding to the gas production volume.
10. The method for calculating battery expansion force according to claim 1, characterized in that, The target battery expansion force is obtained by calculating the current thickness parameter and current gas production using the battery expansion force calculation model, including: Determine the objective function corresponding to the battery expansion force calculation model, wherein the objective function includes at least a first function corresponding to the historical thickness parameter, a second function corresponding to the historical gas production, and a function constant term corresponding to the battery initial preload force; The first battery expansion force is obtained by calculating the current thickness parameter using the first function; The second function is used to calculate the current gas production to obtain the second battery expansion force; The target battery expansion force is obtained by summing the first battery expansion force, the second battery expansion force, and the initial preload of the battery.
11. A device for calculating battery expansion force, characterized in that, include: The determination module is used to determine the historical operating condition parameters of the battery during operation, wherein the historical operating condition parameters include at least: historical thickness parameters, historical gas production, and historical battery expansion force; The construction module is used to construct a battery expansion force calculation model based on the correspondence between the historical thickness parameters, the historical gas production, and the historical battery expansion force. The module is used to calculate the target battery expansion force by using the battery expansion force calculation model to calculate the current thickness parameters and the current gas production.
12. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program, when executed, performs the method according to any one of claims 1 to 10.
13. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to execute the method described in any one of claims 1 to 10 through the computer program.
14. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 10.