WO2022089650A1

WO2022089650A1 - Battery thermal runaway simulation method and apparatus, device and storage medium

Info

Publication number: WO2022089650A1
Application number: PCT/CN2021/128084
Authority: WO
Inventors: 谷文博; 刘轶鑫; 荣常如; 张頔
Original assignee: 中国第一汽车股份有限公司
Priority date: 2020-11-02
Filing date: 2021-11-02
Publication date: 2022-05-05
Also published as: CN112380679A

Abstract

Provided are a battery thermal runaway simulation method and apparatus, a device and a storage medium. The battery thermal runaway simulation method comprises: acquiring at least one data parameter of thermal runaway of a battery (S110); establishing a battery thermal runaway simulation model according to the at least one data parameter (S120); and simulating a battery thermal runaway fault by means of a test simulation platform, wherein the test simulation platform is built by the battery thermal runaway simulation model, a synchronization model, and a fault injection model (S130).

Description

Simulation method, device, device and storage medium for battery thermal runaway

This application claims the priority of the Chinese Patent Application No. 202011204452.3 filed with the China Patent Office on November 2, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of new energy technologies, for example, to a method, device, device and storage medium for simulating thermal runaway of a battery.

Background technique

With the continuous progress and development of new energy vehicles, more and more attention has been paid to the safety of batteries. For lithium-ion batteries, thermal runaway is the most serious safety accident. It will cause lithium-ion batteries to catch fire or even explode, directly threatening the safety of users. . The thermal runaway of lithium-ion batteries is mainly due to the fact that the internal heat generation is much higher than the heat dissipation rate, and a large amount of heat is accumulated inside the lithium-ion battery, which causes a chain reaction, causing the battery to catch fire and explode.

Therefore, the research on test devices and test methods for battery thermal runaway has become a key technology for the development of new energy vehicles. However, related technologies are all tested through battery packs, which are costly and time-consuming.

SUMMARY OF THE INVENTION

The present application provides a method, device, device and storage medium for simulating thermal runaway of a battery, so as to achieve the purpose of reducing cost and improving test efficiency.

A simulation method of battery thermal runaway is provided, including:

Obtain at least one data parameter of battery thermal runaway;

establishing a battery thermal runaway simulation model according to the at least one data parameter;

The fault of battery thermal runaway is simulated by a test simulation platform, wherein the test simulation platform is built by the battery thermal runaway simulation model, synchronization model and fault injection model.

Also provided is a simulation device for thermal runaway of a battery, comprising:

a data parameter acquisition module, set to acquire at least one data parameter of the thermal runaway of the battery;

a battery thermal runaway simulation model establishment module, configured to establish a battery thermal runaway simulation model according to the at least one data parameter;

The fault simulation module of battery thermal runaway is set to simulate the fault of battery thermal runaway through a test simulation platform, wherein the test simulation platform is built by the battery thermal runaway simulation model, synchronization model and fault injection model.

A computer device is also provided, including a memory, a processor, and a computer program stored in the memory and running on the processor, the processor implementing the program as described in any of the embodiments of the present application when the processor executes the program. Simulation method for battery thermal runaway.

A computer-readable storage medium is also provided, storing a computer program, and when the computer program is executed by a processor, the method for simulating a thermal runaway of a battery as described in any of the embodiments of the present application is implemented.

Description of drawings

1a is a schematic flowchart of a method for simulating thermal runaway of a battery provided in Embodiment 1 of the present application;

1b is a schematic diagram of a test simulation platform provided in Embodiment 1 of the present application;

FIG. 1 c is a comparison curve diagram of the cell voltage output by a test simulation platform provided in the first embodiment of the present application and the cell voltage of thermal runaway;

Fig. 1d is a temperature comparison curve diagram of the temperature output by a test simulation platform provided in the first embodiment of the present application and the temperature of thermal runaway;

2 is a schematic structural diagram of a simulation device for battery thermal runaway provided in Embodiment 2 of the present application;

FIG. 3 is a schematic structural diagram of a device provided in Embodiment 3 of the present application.

Detailed ways

The present application will be described below with reference to the accompanying drawings and embodiments. The embodiments described here are only used to explain the present application, but not to limit the present application. For convenience of description, the drawings only show some but not all structures related to the present application.

Some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowchart depicts various steps as a sequential process, many of the steps may be performed in parallel, concurrently, or concurrently. Furthermore, the order of the various steps can be rearranged. The process may be terminated when its operation is complete, but may also have additional steps not included in the figures. The processing may correspond to a method, function, procedure, subroutine, subroutine, or the like.

Example 1

FIG. 1a is a schematic flowchart of a method for simulating thermal runaway of a battery provided in the first embodiment of the present application. This embodiment can be applied to verify the real-time performance and effectiveness of the battery thermal runaway diagnosis function. The method can be performed by a battery A simulation of thermal runaway is performed. The apparatus can be implemented in software and/or hardware, and can be integrated into electronic equipment, including the following steps.

S110. Acquire at least one data parameter of the thermal runaway of the battery.

In this embodiment, the thermal runaway of the battery means that the current and the battery temperature of the battery undergo a cumulative enhancement and are gradually damaged during constant voltage charging. The data parameters are obtained based on thermal runaway big data or thermal runaway test data.

Optionally, the at least one data parameter includes: cell voltage within a non-preset range, battery temperature within a non-preset range, battery pressure value within a non-preset range, and battery gas within a non-preset range Concentration, smoke concentration in the battery not within the preset range, carbon dioxide concentration in the battery not within the preset range, insulation resistance not within the preset range, humidity within the battery not within the preset range, and battery not within the preset range Internal solid particle concentration.

After acquiring multiple parameters that are not within the preset range, it can also be determined what causes the parameters to be within the non-preset range. For example, whether it is caused by sampling failure, sensor failure, or communication failure, by judging the cause and recording the failure type and failure location. The non-preset range means that the data parameters are not in the normal range, and the preset range refers to the range of the data parameters in which the battery is in a normal working scene.

S120. Establish a battery thermal runaway simulation model according to the at least one data parameter.

In this embodiment, the battery thermal runaway simulation model is established based on different data parameters, and according to different battery working scenarios, a multi-scenario battery thermal runaway simulation can be realized.

In this embodiment, optionally, establishing a battery thermal runaway simulation model according to the at least one data parameter includes:

Determine the correlation of the parameter and the variation characteristic of the parameter according to the at least one data parameter;

The battery thermal runaway simulation model is established according to the correlation of the parameters and the variation characteristics of the parameters.

In this embodiment, the change characteristic of the parameter refers to the change process of the parameter. Exemplarily, the temperature change characteristic refers to a temperature rise, and the temperature rises by 10°C/min. The correlation of parameters refers to the relationship between different parameters. Exemplarily, the battery temperature may increase while the cell voltage decreases. In this embodiment, the change characteristic of the parameter also includes the change sequence of the parameter. Exemplarily, after the cell voltage drops to a threshold value, the battery temperature will increase.

In this embodiment, according to different data parameters, different data information of thermal runaway operating conditions are extracted, and different battery thermal runaway simulation models are established to form a multi-dimensional battery thermal runaway simulation model. The battery thermal runaway simulation model is classified, screened and summarized, and then the battery thermal runaway simulation model is improved.

S130 , simulating a battery thermal runaway fault through a test simulation platform, where the test simulation platform is constructed by the battery thermal runaway simulation model, the synchronization model, and the fault injection model.

The thermal runaway model of the battery will output different voltage, temperature parameters, etc., and the role of the synchronous model is to ensure that the different parameters of the output can be output at the same time on multiple simulation units. Because the response time of multiple simulation units is different, it needs to be adjusted by the synchronous model. deal with. Optionally, the test simulation platform further includes:

Power battery simulation model and battery working scene simulation model.

In this embodiment, the power battery simulation model can simulate the external characteristics of the power battery, such as cell voltage changes, temperature changes, and the like. The battery working scene simulation model can simulate the external electronic control unit (ECU) or assembly of the power battery, such as simulating the vehicle controller and on-board charger, and then simulate the charging working scene.

In this embodiment, the extraction of the battery working scene includes:

Determine whether the current communication of the battery management system is normal, if there is no current communication in the battery management system, it is determined that the current is in sleep mode;

If the communication of the battery management system is normal, it is necessary to determine whether there is a charging gun connected. If there is a charging gun connected, it is necessary to judge whether the current charging mode is DC charging, AC charging, remote charging, timing charging or other charging modes through the charging gun type and charging mode;

If there is no charging gun connected, judge whether there is a discharge gun connected, if there is a discharge gun connected, the working mode is discharge mode;

If there is no discharge gun connected, judge the position of the key door. If the key door is in the OFF position, it is judged that it is in the process of power off and sleep or the process of battery self-awakening;

If the position of the key door is not OFF, judge the state of the contactor, if the contactor is in the disconnected state, it is the static mode;

If the high-voltage contactor is closed, it is the driving mode;

Through the analysis of the scene, the current battery working scene is provided, and all the judgment parameters in the process are extracted.

Optionally, the fault injection model includes:

Fault injection project and fault injection timing.

The fault injection item refers to the specific fault item, for example, it may include the open circuit and short circuit faults of the sensor. The fault injection timing refers to the time for injecting faults, for example, it can include injection after the controller wakes up to work or injection before wake-up.

In this embodiment, the test simulation platform can be selected from the following simulation units according to data parameters and battery working scenarios: a cell voltage simulation unit, a cell voltage fault simulation unit, a battery temperature simulation unit, a battery temperature fault simulation unit, and a pressure simulation unit , pressure failure simulation unit, humidity simulation unit, humidity failure simulation unit, carbon dioxide concentration simulation unit, carbon dioxide concentration failure simulation unit, gas concentration simulation unit, gas concentration failure simulation unit, smoke concentration simulation unit, smoke concentration failure simulation unit, solid particulate matter Concentration simulation unit, solid particle concentration fault simulation unit, battery total voltage simulation unit, Hall shunt simulation unit, communication unit, communication fault simulation unit, low voltage constant voltage source, key door simulation unit, charging gun connection simulation unit, high voltage contact The device state simulation unit and the battery management system (Battery Management System, BMS) related input simulation unit. The schematic diagram of the test simulation platform can be seen in Figure 1b.

The test simulation platform runs the power battery simulation model to simulate the changes of battery data parameters under normal conditions; the test simulation platform runs the battery working scene simulation model to simulate the working scene when the battery thermal runaway occurs; the test simulation platform runs the battery thermal runaway simulation model , simulating the parameter changes during thermal runaway. The test simulation platform performs synchronous processing on the simulated parameters, considering the model simulation step size of different parameters, the driving step size of the test simulation platform and the response step size of the simulation unit, so that the simulation units with different parameters can be updated synchronously. By adjusting the drive step size and response step size of the fault injection item and the fault injection sequence, the timing of the fault occurrence can be accurately simulated.

Optionally, after simulating the thermal runaway fault of the battery through the test simulation platform, the method further includes:

The fault data of the thermal runaway of the battery is output, and compared with at least one data parameter of the thermal runaway of the battery.

In this embodiment, the thermal runaway simulation model is optimized by comparing the simulated thermal runaway parameters with the real thermal runaway parameters. You can refer to the comparison curve of the cell voltage output by the test simulation platform and the thermal runaway voltage shown in FIG. 1c, and the temperature comparison curve of the temperature output of the test simulation platform and the thermal runaway shown in FIG. 1d. .

The embodiments of the present application provide a method for simulating battery thermal runaway, including: acquiring at least one data parameter of battery thermal runaway; establishing a battery thermal runaway simulation model according to the at least one data parameter; simulating battery thermal runaway through a test simulation platform The fault of the test simulation platform is built by the battery thermal runaway simulation model, the synchronization model and the fault injection model. The above technical means can achieve the purpose of reducing the cost and improving the efficiency of the test.

Embodiment 2

FIG. 2 is a schematic structural diagram of a battery thermal runaway simulation device provided in Embodiment 2 of the present application. The battery thermal runaway simulation device provided by the embodiment of the present application can execute the battery thermal runaway simulation method provided by any embodiment of the present application, and has functional modules and effects corresponding to the execution method. As shown in Figure 2, the device includes the following modules.

The data parameter acquisition module 210 is configured to acquire at least one data parameter of the thermal runaway of the battery;

The battery thermal runaway simulation model establishment module 220 is configured to establish a battery thermal runaway simulation model according to the at least one data parameter;

The battery thermal runaway fault simulation module 230 is configured to simulate the battery thermal runaway fault through a test simulation platform, wherein the test simulation platform is constructed by the battery thermal runaway simulation model, the synchronization model and the fault injection model.

Optionally, the at least one data parameter includes:

Cell voltage not in the preset range, battery temperature in the non-preset range, battery pressure value in the non-preset range, gas concentration in the battery not in the preset range, smoke concentration in the battery not in the preset range , the carbon dioxide concentration in the battery in the non-preset range, the insulation resistance in the non-preset range, the humidity in the battery in the non-preset range, and the solid particle concentration in the battery in the non-preset range.

The battery thermal runaway simulation model establishment module 220 is configured to determine the correlation of the parameters and the variation characteristics of the parameters according to the at least one data parameter;

Optionally, the test simulation platform further includes:

Power battery simulation model and battery working scene simulation model.

Optionally, the fault injection model includes:

Fault injection project and fault injection timing.

Optionally, the device further includes:

The fault data output module 240 is configured to output fault data of the thermal runaway of the battery, and compare it with at least one data parameter of the thermal runaway of the battery.

For the working process of the apparatus described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

Embodiment 3

FIG. 3 is a schematic structural diagram of a device according to Embodiment 3 of the present application, and FIG. 3 shows a schematic structural diagram of an exemplary device suitable for implementing the embodiments of the present application. The device 12 shown in FIG. 3 is only an example, and should not impose any limitations on the functions and scope of use of the embodiments of the present application.

As shown in FIG. 3, device 12 takes the form of a general-purpose computing device. Components of device 12 may include: one or more processors or processing units 16, system memory 28, and a bus 18 connecting various system components including system memory 28 and processing unit 16.

Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of a variety of bus structures. For example, these architectures include Industry Subversive Alliance (ISA) bus, Micro Channel Architecture (MCA) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) ) local bus and peripheral component interconnect (Peripheral Component Interconnect, PCI) bus.

Device 12 includes a variety of computer system readable media. These media can be any available media that can be accessed by device 12, including volatile and non-volatile media, removable and non-removable media.

System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and/or cache 32 . Device 12 may include other removable/non-removable, volatile/non-volatile computer system storage media. For example only, storage system 34 may be used to read and write to non-removable, non-volatile magnetic media (not shown in FIG. 3, commonly referred to as a "hard disk drive"). Although not shown in FIG. 3, magnetic disk drives for reading and writing to removable non-volatile magnetic disks (eg "floppy disks") and removable non-volatile optical disks (eg Compact Disk Read Only Memory) may be provided Disc Read Only Memory, CD-ROM), digital versatile disc read only memory (Digital Video Disk Read Only Memory, DVD-ROM) or other optical media) optical disk drive for reading and writing. In these cases, each drive may be connected to bus 18 through one or more data media interfaces. System memory 28 may include at least one program product having a set (eg, at least one) of program modules configured to perform the functions of various embodiments of the present application.

A program/utility 40 having a set (at least one) of program modules 42, which may be stored, for example, in system memory 28, such program modules 42 including an operating system, one or more application programs, other program modules, and program data, which An implementation of a network environment may be included in each or a combination of the examples. The program module 42 generally executes the functions and/or methods in the embodiments described in the embodiments of the present application.

Device 12 may also communicate with one or more external devices 14 (eg, keyboards, pointing devices, display 24, etc.), may also communicate with one or more devices that enable a user to interact with device 12, and/or communicate with Device 12 can communicate with any device (eg, network card, modem, etc.) that communicates with one or more other computing devices. Such communication may take place through an input/output (I/O) interface 22 . Also, device 12 may communicate with one or more networks (eg, Local Area Network (LAN), Wide Area Network (WAN), and/or public networks such as the Internet) through network adapter 20. As shown in FIG. 3 , network adapter 20 communicates with other modules of device 12 via bus 18 . Although not shown, other hardware and/or software modules may be used in conjunction with device 12, including: microcode, device drivers, redundant processing units, external disk drive arrays, Redundant Arrays of Independent Disks (RAID) systems , tape drives, and data backup storage systems.

The processing unit 16 executes a variety of functional applications and data processing by running programs stored in the system memory 28, such as implementing a method for simulating thermal runaway of a battery provided by the embodiments of the present application, including:

Obtain at least one data parameter of battery thermal runaway;

Embodiment 4

The fourth embodiment of the present application further provides a computer-readable storage medium, which stores a computer program (or computer-executable instruction), and when the program is executed by the processor, can realize the thermal runaway of the battery described in any of the foregoing embodiments. mock methods, including:

Obtain at least one data parameter of battery thermal runaway;

The computer storage medium of the embodiments of the present application may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The storage medium may be a non-transitory storage medium. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. Computer readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, RAM, Read-Only Memory (ROM), Erasable Programmable Read-Only Memory (Erasable Programmable Read-Only Memory) Only Memory, EPROM), flash memory, optical fiber, portable CD-ROM, optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .

Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including—wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out the operations of the embodiments of the present application may be written in one or more programming languages, or combinations thereof, including object-oriented programming languages—such as Java, Smalltalk, C++, and also A conventional procedural programming language - such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. Where a remote computer is involved, the remote computer may be connected to the user computer through any kind of network, including a LAN or WAN, or may be connected to an external computer (eg, using an Internet service provider to connect through the Internet).

Claims

A simulation method for battery thermal runaway, comprising:

Obtain at least one data parameter of battery thermal runaway;

establishing a battery thermal runaway simulation model according to the at least one data parameter;

The fault of battery thermal runaway is simulated by a test simulation platform, wherein the test simulation platform is built by the battery thermal runaway simulation model, synchronization model and fault injection model.
The method of claim 1, wherein the at least one data parameter comprises:

Cell voltage not in the preset range, battery temperature in the non-preset range, battery pressure value in the non-preset range, gas concentration in the battery not in the preset range, smoke concentration in the battery not in the preset range , the carbon dioxide concentration in the battery in the non-preset range, the insulation resistance in the non-preset range, the humidity in the battery in the non-preset range, and the solid particle concentration in the battery in the non-preset range.
The method according to claim 1, wherein the establishing a battery thermal runaway simulation model according to the at least one data parameter comprises:

Determine the correlation of the parameter and the variation characteristic of the parameter according to the at least one data parameter;

The battery thermal runaway simulation model is established according to the correlation of the parameters and the variation characteristics of the parameters.
The method according to claim 1, wherein the test simulation platform further comprises:

Power battery simulation model and battery working scene simulation model.
The method of claim 1, wherein the fault injection model comprises:

Fault injection project and fault injection timing.
The method according to claim 1, wherein after simulating the failure of thermal runaway of the battery through the test simulation platform, further comprising:

The fault data of the thermal runaway of the battery is output, and compared with at least one data parameter of the thermal runaway of the battery.
A simulation device for battery thermal runaway, comprising:

a data parameter acquisition module, set to acquire at least one data parameter of the thermal runaway of the battery;

a battery thermal runaway simulation model establishment module, configured to establish a battery thermal runaway simulation model according to the at least one data parameter;

The battery thermal runaway fault simulation module is configured to simulate the battery thermal runaway fault through a test simulation platform, wherein the test simulation platform is constructed by the battery thermal runaway simulation model, the synchronization model and the fault injection model.
The apparatus of claim 7, wherein the at least one data parameter comprises:

Cell voltage not in the preset range, battery temperature in the non-preset range, battery pressure value in the non-preset range, gas concentration in the battery not in the preset range, smoke concentration in the battery not in the preset range , the carbon dioxide concentration in the battery in the non-preset range, the insulation resistance in the non-preset range, the humidity in the battery in the non-preset range, and the solid particle concentration in the battery in the non-preset range.
A computer device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the computer program as claimed in claims 1-6 when executing the computer program Any one of the simulation methods for thermal runaway of a battery.
A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the method for simulating thermal runaway of a battery according to any one of claims 1-6 is implemented.