Lithium battery simulation method and device, equipment and storage medium

Abstract

The embodiment of the invention discloses a simulation method, device and equipment of a lithium battery and a storage medium. The method comprises the steps that design parameters of the lithium battery are acquired, and a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery are established based on the design parameters; the one-dimensional electrochemical model is used for providing generated heat for the three-dimensional thermal model, the three-dimensional thermal model is used for feeding back the real-time temperature for the one-dimensional electrochemical model, coupling of the one-dimensional electrochemical model and the three-dimensional thermal model is achieved, and a coupling model is obtained; determining the instantaneous heat production power of the lithium battery based on the coupling model; and based on the instantaneous heat production power, determining the battery adiabatic temperature of the lithium battery by using the three-dimensional thermal model to obtain the adiabatic temperature rise condition of the lithium battery. According to the embodiment of the invention, the technical problems that the cost is high, the test time is relatively long and the instantaneous heat production power of the lithium battery cannot be obtained when the adiabatic test is carried out on the lithium battery in the prior art are solved, and the technical effect of simply and efficiently obtaining the adiabatic temperature rise condition of the lithium battery is realized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of test simulation technology, and in particular to a simulation method, apparatus, device and storage medium for lithium batteries. Background Technology

[0002] Lithium-ion batteries are a crucial component of modern electronic devices, electric vehicles, and energy storage systems, and their safety and power performance are paramount. Temperature rise testing is a critical step in ensuring lithium-ion battery quality, helping us identify and address potential safety hazards and improve overall battery performance. Temperature rise testing reveals how the battery's temperature changes under different operating conditions, thus assessing its thermal stability. This helps prevent safety risks such as battery thermal runaway. However, adiabatic temperature rise testing of batteries is often costly and time-consuming, and the instantaneous heat generation during battery charging and discharging is difficult to obtain from testing. Summary of the Invention

[0003] This invention provides a method, apparatus, device, and storage medium for simulating lithium batteries, which solves the technical problems of high cost, long testing time, and inability to obtain the instantaneous heat generation power of lithium batteries in the prior art when conducting adiabatic testing.

[0004] This invention provides a simulation method for lithium batteries, the method comprising:

[0005] Obtain the design parameters of the lithium battery, and establish a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters;

[0006] The one-dimensional electrochemical model is used to provide heat generation for the three-dimensional thermal model, and the three-dimensional thermal model is used to provide real-time temperature feedback for the one-dimensional electrochemical model, thereby achieving coupling between the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model.

[0007] The instantaneous heat generation power of the lithium battery is determined based on the coupling model.

[0008] Based on the instantaneous heat generation power, the adiabatic temperature of the lithium battery is determined using the three-dimensional thermal model, thus obtaining the adiabatic temperature rise of the lithium battery.

[0009] Furthermore, before determining the instantaneous heat generation temperature of the lithium battery based on the coupling model, the method further includes:

[0010] Obtain the charge and discharge test data of the lithium battery;

[0011] The one-dimensional electrochemical model and the three-dimensional thermal model were calibrated using the charge-discharge test data.

[0012] Furthermore, the one-dimensional electrochemical model is further developed using the charge-discharge test data, including:

[0013] The one-dimensional electrochemical model is calibrated using the voltage, current, and capacity data from the charge-discharge test data.

[0014] Furthermore, calibrating the three-dimensional thermal model using the charge-discharge test data includes:

[0015] The physical properties of the lithium battery are calculated based on the charge and discharge test data, wherein the physical properties include at least the thermal conductivity, specific heat capacity, and density of the lithium battery.

[0016] The three-dimensional thermal model is calibrated using the aforementioned physical property parameters.

[0017] Furthermore, determining the instantaneous heat generation power of the lithium battery based on the coupling model includes:

[0018] Obtain the operating condition data of the lithium battery, wherein the operating condition data is the operating loop parameter of the lithium battery;

[0019] Set the adiabatic boundary conditions for the lithium battery;

[0020] The operating condition data and the adiabatic boundary conditions are input into the coupled model, and the instantaneous heat generation power of the lithium battery is obtained by simulation based on the coupled model.

[0021] Furthermore, obtaining the charge / discharge test data of the lithium battery includes:

[0022] The lithium battery was subjected to charge-discharge tests at different rates at room temperature.

[0023] The data of the lithium battery during the charge and discharge test are recorded in real time to obtain the charge and discharge test data.

[0024] This invention also provides a lithium battery simulation device, the device comprising:

[0025] The model building unit is used to obtain the design parameters of the lithium battery and build a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters.

[0026] The model coupling unit is used to provide heat generation for the three-dimensional thermal model using the one-dimensional electrochemical model, and to provide real-time temperature feedback for the one-dimensional electrochemical model using the three-dimensional thermal model, thereby achieving the coupling of the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model.

[0027] A power determination unit is used to determine the instantaneous heat generation power of the lithium battery based on the coupling model.

[0028] The adiabatic temperature simulation unit is used to determine the battery adiabatic temperature of the lithium battery based on the instantaneous heat generation power and the three-dimensional thermal model, thereby obtaining the adiabatic temperature rise of the lithium battery.

[0029] Furthermore, before the model coupling unit determines the instantaneous heat generation temperature of the lithium battery based on the coupling model, the device further includes:

[0030] A data acquisition unit is used to acquire charge and discharge test data of the lithium battery;

[0031] The model calibration unit is used to calibrate the one-dimensional electrochemical model and the three-dimensional thermal model using the charge-discharge test data, respectively.

[0032] This invention also provides a lithium battery simulation device, which includes:

[0033] At least one processor; and

[0034] A memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the lithium battery simulation method described in any of the above embodiments.

[0036] This invention also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the lithium battery simulation method described in any of the above embodiments.

[0037] This invention discloses a simulation method, apparatus, device, and storage medium for lithium batteries. The method includes obtaining the design parameters of the lithium battery; establishing a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters; using the one-dimensional electrochemical model to provide heat generation for the three-dimensional thermal model, and using the three-dimensional thermal model to provide real-time temperature feedback for the one-dimensional electrochemical model, thereby achieving coupling between the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model; determining the instantaneous heat generation power of the lithium battery based on the coupled model; and determining the adiabatic temperature of the lithium battery based on the instantaneous heat generation power using the three-dimensional thermal model to obtain the adiabatic temperature rise of the lithium battery. This invention solves the technical problems of high cost, long testing time, and inability to obtain the instantaneous heat generation power of the lithium battery in existing adiabatic testing methods, achieving a simple and efficient technical effect in obtaining the adiabatic temperature rise of lithium batteries. Attached Figure Description

[0038] Figure 1 This is a flowchart of a lithium battery simulation method provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of a one-dimensional electrochemical model of a lithium battery provided in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of a three-dimensional thermal model of a lithium battery provided in an embodiment of the present invention;

[0041] Figure 4 This is a cross-sectional view of the three-dimensional thermal model of the lithium battery provided in the embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the coupling of a one-dimensional electrochemical-three-dimensional thermal coupling model of a lithium battery provided in an embodiment of the present invention;

[0043] Figure 6 This is the heat generation power curve output by the one-dimensional electrochemical model simulation provided in this embodiment of the invention;

[0044] Figure 7 This is an adiabatic temperature curve output from the three-dimensional thermal model simulation provided in this embodiment of the invention;

[0045] Figure 8 This is a diagram showing the adiabatic temperature distribution output from the three-dimensional thermal model simulation of a lithium battery provided in this embodiment of the invention.

[0046] Figure 9 This is a comparison chart of the simulated output voltage and the measured voltage data of the one-dimensional electrochemical model provided in this embodiment of the invention;

[0047] Figure 10 This is a comparison chart of the simulated output voltage and the measured voltage data of the three-dimensional thermal model provided in this embodiment of the invention;

[0048] Figure 11 This is a structural diagram of a lithium battery simulation device provided in an embodiment of the present invention;

[0049] Figure 12 This is a schematic diagram of the structure of a lithium battery simulation device provided in an embodiment of the present invention. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0052] Figure 1 This is a flowchart of a lithium battery simulation method provided in an embodiment of the present invention.

[0053] like Figure 1 As shown, the simulation method for this lithium battery specifically includes the following steps:

[0054] S101: Obtain the design parameters of the lithium battery, and establish a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters.

[0055] Specifically, the design parameters of lithium batteries include at least the electrode size, cell capacity, electrode and separator thickness, and current collector thickness. Figure 2 This is a schematic diagram of a one-dimensional electrochemical model of a lithium battery provided in an embodiment of the present invention, as shown below. Figure 2 As shown, L_neg_cc is the negative current collector, L_neg is the negative electrode, L_sep is the diaphragm, L_pos is the positive electrode, and L_pos_cc is the positive current collector. Figure 3 This is a schematic diagram of a three-dimensional thermal model of a lithium battery provided in an embodiment of the present invention. Figure 4 This is a cross-sectional view of the three-dimensional thermal model of the lithium battery provided in the embodiments of the present invention, such as... Figure 3 and Figure 4As shown, 1 is the aluminum-plastic film; 2 is the positive electrode tab; 3 is the negative electrode tab; 4 is the stacked core area; and 5 is the composite area (air / electrolyte / separator).

[0056] S102, a one-dimensional electrochemical model is used to provide heat generation for a three-dimensional thermal model, and a three-dimensional thermal model is used to provide real-time temperature feedback for a one-dimensional electrochemical model, thereby achieving coupling between the one-dimensional electrochemical model and the three-dimensional thermal model and obtaining a coupled model;

[0057] Figure 5 This is a schematic diagram of the coupling of a one-dimensional electrochemical-three-dimensional thermal coupling model of a lithium battery provided in an embodiment of the present invention. Figure 5 As shown, , This indicates the electrode potential of a lithium battery. , The values ​​represent the concentration of lithium ions in the electrode / electrolyte, T represents temperature, and V represents volume. Bidirectional data exchange is achieved through avg(T) (average temperature) and avg(Qh) (average heat flux). That is, the heat generated by the one-dimensional electrochemical model (such as polarization heat) drives the temperature change of the three-dimensional thermal model, and the temperature feedback (T) from the three-dimensional thermal model affects the electrochemical reaction rate of the one-dimensional electrochemical model, such as the change in the lithium ion diffusion coefficient with temperature, ultimately forming a closed-loop coupling.

[0058] Specifically, the heat generated by the one-dimensional electrochemical model can drive the three-dimensional thermal model. That is, the irreversible heat generated by electrochemical polarization (ohmic polarization, concentration polarization, and electrochemical polarization) is calculated by inputting avg(Qh) into the three-dimensional thermal model. The three-dimensional thermal model feeds back to influence the one-dimensional electrochemical model. That is, the avg(T) output by the three-dimensional thermal model is fed back to the one-dimensional electrochemical model to adjust the reaction kinetic parameters, such as the reaction rate constant and diffusion coefficient, and correct the electrochemical characteristics, forming a closed-loop coupling.

[0059] S103, the instantaneous heat generation power of the lithium battery is determined based on the coupling model.

[0060] Specifically, by inputting the charge and discharge test data of the lithium battery into the coupled model, the instantaneous heat generation power of the lithium battery can be obtained through simulation. Figure 6 This is the heat generation power curve output by the one-dimensional electrochemical model simulation provided in this embodiment of the invention. Figure 7 This is an adiabatic temperature curve output from the three-dimensional thermal model simulation provided in this embodiment of the invention. Figure 6 The output heat generation power curve from a one-dimensional electrochemical model simulation of a 13Ah pouch cell under adiabatic conditions at 1C discharge is shown. Figure 7 The adiabatic temperature curve is the output of a three-dimensional thermal model simulation of a 13Ah soft-pack battery under adiabatic conditions and 1C discharge.

[0061] S104, based on instantaneous heat generation power, uses a three-dimensional thermal model to determine the battery adiabatic temperature of the lithium battery, and obtains the adiabatic temperature rise of the lithium battery.

[0062] Specifically, after obtaining the instantaneous heat generation power of the lithium battery, the battery adiabatic temperature can be obtained through three-dimensional thermal model simulation. Figure 8 This is a diagram showing the adiabatic temperature distribution output from a three-dimensional thermal model simulation of a lithium battery provided in this embodiment of the invention. Figure 8 The image shows the adiabatic temperature distribution output from a three-dimensional thermal model simulation of a 13Ah pouch battery under adiabatic conditions at 1C discharge. Figure 8 The adiabatic temperature rise of the lithium battery can be clearly seen.

[0063] This invention couples a one-dimensional electrochemical model and a three-dimensional thermal model of a lithium battery, uses the coupled model to simulate the instantaneous heat generation power of the lithium battery, and uses the three-dimensional thermal model to output the adiabatic temperature of the lithium battery, thus obtaining the adiabatic temperature rise of the lithium battery. This solves the technical problems of high cost, long testing time, and inability to obtain the instantaneous heat generation power of the lithium battery in the existing adiabatic test, and achieves the technical effect of simple and efficient acquisition of the adiabatic temperature rise of the lithium battery.

[0064] Optionally, in S103, before determining the instantaneous heat generation temperature of the lithium battery based on the coupling model, the method further includes:

[0065] Obtain charge and discharge test data of lithium batteries; use the charge and discharge test data to calibrate the one-dimensional electrochemical model and the three-dimensional thermal model respectively.

[0066] Specifically, to ensure the simulation accuracy of the established model, it is necessary to calibrate the model based on the measured data of the lithium battery after the model is established. Optionally, obtaining the charge and discharge test data of the lithium battery includes: placing the lithium battery at room temperature and conducting charge and discharge tests at different rates; recording the data of the lithium battery during the charge and discharge test in real time to obtain the charge and discharge test data.

[0067] Optionally, the one-dimensional electrochemical model can be constructed using charge-discharge test data, including:

[0068] The one-dimensional electrochemical model was calibrated using voltage, current, and capacity data from charge-discharge test data.

[0069] Specifically, after obtaining the one-dimensional electrochemical model, in order to ensure the simulation accuracy of the model and make the simulation data consistent with the measured data of the lithium battery, it is also necessary to use the charge and discharge test data of the lithium battery, i.e., the measured data, to calibrate the one-dimensional electrochemical model.

[0070] Figure 9This is a comparison chart of the simulated output voltage and measured voltage data of the one-dimensional electrochemical model provided in this embodiment of the invention, as shown in the figure. Figure 9 The figure shows the discharge voltage curve of a 13Ah pouch battery at a discharge rate of 1C and an ambient temperature of 25℃. The horizontal axis represents the depth of discharge (DOD, 0-100%), and the vertical axis represents the voltage (2-3.6V). It includes two curves: simulated voltage (Voltage-sim) and measured voltage (Voltage-test). It can be seen that after calibration, the simulated voltage curve is very close to the measured voltage curve.

[0071] Optionally, calibrating the three-dimensional thermal model using charge-discharge test data includes:

[0072] The physical properties of lithium batteries are calculated based on charge-discharge test data. These physical properties include at least the thermal conductivity, specific heat capacity, and density of the lithium batteries. The three-dimensional thermal model is then calibrated using these physical properties.

[0073] Specifically, after obtaining the three-dimensional thermal model, in order to ensure the simulation accuracy of the model and make the simulation data consistent with the measured data of the lithium battery, it is also necessary to use the charge and discharge test data of the lithium battery to calculate the physical property parameters of the lithium battery, and then use the physical property parameters to correct the three-dimensional thermal model.

[0074] Figure 10 This is a comparison chart of the simulated output voltage and the measured voltage data of the three-dimensional thermal model provided in this embodiment of the invention. Figure 10 This chart compares the simulated and measured temperatures of a 13Ah pouch battery at a 1C discharge rate using a 3D thermal model. The chart shows that as the depth of discharge (DOD) increases from 0 to 1, both the simulated and measured temperature curves generally show an upward trend. This indicates that the cell generates heat during discharge, leading to a temperature increase. When the DOD is low (around 0-0.4), the simulated and measured temperature curves are quite similar, indicating a small deviation between the simulation and actual test results in the early stages of discharge. When the DOD is between 0.4 and 0.6, the simulated temperature curve is relatively stable, while the measured temperature curve still fluctuates and is generally slightly lower than the simulated temperature. After the DOD exceeds 0.6, both curves rise rapidly, and when the DOD approaches 1, the two curves almost overlap, indicating that the simulated and measured temperature trends become consistent in the later stages of discharge. Overall, the simulated temperature curve is relatively smooth, while the measured temperature curve fluctuates more significantly. This may be due to factors that are difficult to precisely control and simulate in actual testing, such as subtle changes in ambient temperature and the non-uniformity of the cell's internal structure.

[0075] The formulas for calculating physical property parameters include:

[0076] Formula for calculating thermal conductivity in the thickness direction: Where λx is the thermal conductivity in the thickness direction, Lx is the total length of the lithium battery stack in the thickness direction, Lxi is the length of the i-th layer material in the thickness direction, and λi is the thermal conductivity of the i-th layer material.

[0077] Formulas for calculating thermal conductivity along length and height: , where λy and λz represent the thermal conductivity in the length and height directions, respectively; λi represents the thermal conductivity of the i-th layer material; Lxi represents the length of the i-th layer material in the thickness direction; and Lx represents the total length of the lithium battery stack in the thickness direction.

[0078] Formula for calculating specific heat capacity: Where Cp is the specific heat capacity of the lithium battery cell; w i denoted as , where is the mass percentage of the i-th component; Cp,i is the specific heat capacity of the i-th component; n is the number of components; this formula represents the sum of the products of the mass percentage of each component and the specific heat capacity of each component.

[0079] Density calculation formula: , where ρ is the density of the lithium battery stack; ρ is the volume percentage of the i-th component; i Let n be the density of the i-th component; n is the number of components; this formula represents the sum of the products of the volume percentage of each component and the density of each component.

[0080] Optionally, S103 determines the instantaneous heat generation power of the lithium battery based on the coupling model, specifically including:

[0081] Acquire the operating condition data of the lithium battery, which includes the operating loop parameters of the lithium battery; set the adiabatic boundary conditions of the lithium battery; input the operating condition data and adiabatic boundary conditions into the coupled model, and simulate the instantaneous heat generation power of the lithium battery based on the coupled model.

[0082] Specifically, operating condition data refers to the core environment and operating parameters of lithium battery operation, mainly including: (1) discharge rate, such as 1C discharge, which directly affects the heat generation rate (the heat generation rate of 1C discharge can reach 4400W / m³). (2) ambient temperature, such as 25℃ (room temperature), 300K (about 27℃), etc., which need to be used as the initial temperature boundary input, affecting the battery internal resistance and reaction activity. (3) cooling conditions, if active cooling is involved, the cooling fluid parameters need to be specified, such as inlet velocity 0.1-3m / s, inlet temperature 278.15K-298.15K, etc.

[0083] The adiabatic boundary condition refers to the idealized boundary between the lithium battery and the external environment where there is no heat exchange. The core settings include, but are not limited to: (1) Wall treatment: the interface between the battery casing and the cooling fluid is set as the adiabatic boundary, ignoring its heat exchange with the external environment. Since the temperature difference between the inside and outside of the casing is small, the amount of heat exchange can be ignored. (2) Temperature setting: the adiabatic boundary temperature is usually set to be consistent with the initial ambient temperature (e.g., 300K) to ensure that no heat is transferred through the boundary. (3) Fluid-structure coupling: if there is a fluid domain, the interface between the outer surface of the battery casing and the cooling fluid needs to be set as the coupling surface, but under adiabatic conditions, convective heat transfer needs to be turned off.

[0084] Figure 11 This is a structural diagram of a lithium battery simulation device provided in an embodiment of the present invention.

[0085] like Figure 11 As shown, the lithium battery simulation device specifically includes:

[0086] Model building unit 21 is used to obtain the design parameters of lithium battery and build a one-dimensional electrochemical model and a three-dimensional thermal model of lithium battery based on the design parameters.

[0087] Model coupling unit 22 is used to provide heat generation for the three-dimensional thermal model using the one-dimensional electrochemical model, and to provide real-time temperature feedback for the one-dimensional electrochemical model using the three-dimensional thermal model, thereby achieving coupling between the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model.

[0088] The power determination unit 23 is used to determine the instantaneous heat generation power of the lithium battery based on the coupling model;

[0089] The adiabatic temperature simulation unit 24 is used to determine the adiabatic temperature of the lithium battery based on the instantaneous heat generation power using a three-dimensional thermal model, and to obtain the adiabatic temperature rise of the lithium battery.

[0090] Optionally, before the model coupling unit 22 determines the instantaneous heat generation temperature of the lithium battery based on the coupling model, the device further includes:

[0091] The data acquisition unit is used to acquire charge and discharge test data of lithium batteries;

[0092] The model calibration unit is used to calibrate the one-dimensional electrochemical model and the three-dimensional thermal model using charge-discharge test data, respectively.

[0093] Optionally, the power determination unit 23 is specifically used for:

[0094] Acquire the operating condition data of the lithium battery, which includes the operating loop parameters of the lithium battery;

[0095] Set the adiabatic boundary conditions for the lithium battery;

[0096] The operating condition data and adiabatic boundary conditions are input into the coupled model, and the instantaneous heat generation power of the lithium battery is obtained by simulation based on the coupled model.

[0097] Optionally, the data acquisition unit is specifically used for:

[0098] The lithium battery was placed at room temperature for charge and discharge tests at different rates.

[0099] The data of the lithium battery during the charge and discharge test is recorded in real time to obtain the charge and discharge test data.

[0100] The multi-engine control device provided in this embodiment of the invention has the same technical features as the multi-engine control method provided in the above embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0101] Figure 12 This is a schematic diagram of a lithium battery simulation device provided in an embodiment of the present invention. The lithium battery simulation device is intended to represent various forms of digital computers, such as laptops, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0102] like Figure 12 As shown, the lithium battery simulation device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the lithium battery simulation device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0103] Multiple components in the lithium battery simulation device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0104] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as a lithium battery simulation method.

[0105] In some embodiments, the lithium battery simulation method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the lithium battery simulation device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the lithium battery simulation method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the lithium battery simulation method by any other suitable means (e.g., by means of firmware).

[0106] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0107] Computer programs for implementing the lithium battery simulation method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs can be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0108] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0109] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0110] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0111] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0112] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is made herein.

[0113] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A simulation method for lithium batteries, characterized in that, The method includes: Obtain the design parameters of the lithium battery, and establish a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters; The one-dimensional electrochemical model is used to provide heat generation for the three-dimensional thermal model, and the three-dimensional thermal model is used to provide real-time temperature feedback for the one-dimensional electrochemical model, thereby achieving coupling between the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model. The instantaneous heat generation power of the lithium battery is determined based on the coupling model. Based on the instantaneous heat generation power, the adiabatic temperature of the lithium battery is determined using the three-dimensional thermal model, thus obtaining the adiabatic temperature rise of the lithium battery.

2. The lithium battery simulation method according to claim 1, characterized in that, Before determining the instantaneous heat generation temperature of the lithium battery based on the coupling model, the method further includes: Obtain the charge and discharge test data of the lithium battery; The one-dimensional electrochemical model and the three-dimensional thermal model were calibrated using the charge-discharge test data.

3. The lithium battery simulation method according to claim 2, characterized in that, The one-dimensional electrochemical model is constructed using the charge-discharge test data, including: The one-dimensional electrochemical model is calibrated using the voltage, current, and capacity data from the charge-discharge test data.

4. The lithium battery simulation method according to claim 2, characterized in that, The calibration of the three-dimensional thermal model using the charge-discharge test data includes: The physical properties of the lithium battery are calculated based on the charge and discharge test data, wherein the physical properties include at least the thermal conductivity, specific heat capacity, and density of the lithium battery. The three-dimensional thermal model is calibrated using the aforementioned physical property parameters.

5. The lithium battery simulation method according to claim 1, characterized in that, The instantaneous heat generation power of the lithium battery determined based on the coupling model includes: Obtain the operating condition data of the lithium battery, wherein the operating condition data is the operating loop parameter of the lithium battery; Set the adiabatic boundary conditions for the lithium battery; The operating condition data and the adiabatic boundary conditions are input into the coupled model, and the instantaneous heat generation power of the lithium battery is obtained by simulation based on the coupled model.

6. The lithium battery simulation method according to claim 2, characterized in that, Obtaining the charge / discharge test data of the lithium battery includes: The lithium battery was subjected to charge-discharge tests at different rates at room temperature. The data of the lithium battery during the charge and discharge test are recorded in real time to obtain the charge and discharge test data.

7. A lithium battery simulation device, characterized in that, The device includes: The model building unit is used to obtain the design parameters of the lithium battery and build a one-dimensional electrochemical model and a three-dimensional thermal model of the lithium battery based on the design parameters. The model coupling unit is used to provide heat generation for the three-dimensional thermal model using the one-dimensional electrochemical model, and to provide real-time temperature feedback for the one-dimensional electrochemical model using the three-dimensional thermal model, thereby achieving the coupling of the one-dimensional electrochemical model and the three-dimensional thermal model to obtain a coupled model. A power determination unit is used to determine the instantaneous heat generation power of the lithium battery based on the coupling model. The adiabatic temperature simulation unit is used to determine the battery adiabatic temperature of the lithium battery based on the instantaneous heat generation power and the three-dimensional thermal model, thereby obtaining the adiabatic temperature rise of the lithium battery.

8. The lithium battery simulation device according to claim 7, characterized in that, Before the model coupling unit determines the instantaneous heat generation temperature of the lithium battery based on the coupling model, the device further includes: A data acquisition unit is used to acquire charge and discharge test data of the lithium battery; The model calibration unit is used to calibrate the one-dimensional electrochemical model and the three-dimensional thermal model using the charge-discharge test data, respectively.

9. A lithium battery simulation device, characterized in that, The lithium battery simulation equipment includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the simulation method of the lithium battery according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the simulation method of the lithium battery according to any one of claims 1-6.

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