Failure gas monitoring method and device for lithium ion battery

Abstract

The invention relates to a lithium ion battery failure gas monitoring method and device, and belongs to the technical field of battery monitoring, and the lithium ion battery failure gas monitoring method comprises the following steps: obtaining the total mass change amount and the total mass change time length of a lithium ion battery, and the total discharge mass amount and the total discharge time length of failure gas; determining a first gas discharge rate based on the total mass change amount and the total mass change time length of the lithium ion battery, and determining a second gas discharge rate based on the total discharge mass amount and the total discharge time length of the failure gas; determining a first specific value based on a specific value between the first gas discharge rate and the second gas discharge rate, and determining a second specific value based on the total mass change duration of the lithium ion battery and the total discharge duration of the failure gas; and based on the discharge rate of the failure gas, the first ratio and the second ratio, the corrected total discharge mass of the failure gas is determined. According to the invention, the accuracy of lithium ion battery failure gas monitoring is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of battery monitoring technology, and in particular to a method and apparatus for monitoring failure gases in lithium-ion batteries. Background Technology

[0002] Under various abuse conditions, lithium-ion batteries undergo violent internal side reactions, producing large amounts of flammable and toxic gases, leading to a sudden increase in pressure and potentially causing an explosion. The timing, rate, and composition of gas release directly determine the kinetics of failure and the severity of the damage. Therefore, real-time, in-situ, and precise monitoring of the dynamic characteristics of gas generation is crucial for revealing failure mechanisms, constructing safety early warning models, and optimizing system design.

[0003] Currently, mainstream gas analysis methods (such as extracting gas through long pipelines to offline analyzers) have inherent limitations: gas components are dissipated and distorted during transmission, failing to reflect instantaneous peak values ​​and rapid changes. These limitations prevent existing technologies from constructing dynamic function models that accurately describe the gas generation during lithium-ion battery failure, severely restricting the effectiveness of lithium-ion battery safety simulation and active protection strategies.

[0004] Therefore, improving the accuracy of lithium-ion battery failure gas monitoring has become an urgent technical problem to be solved. Summary of the Invention

[0005] In view of this, it is necessary to provide a method and device for monitoring failure gases in lithium-ion batteries to solve the problems of insufficient real-time performance and accuracy of existing lithium-ion battery failure gas monitoring schemes.

[0006] To address the aforementioned problems, in a first aspect, the present invention provides a method for monitoring failure gases in lithium-ion batteries, comprising:

[0007] The total mass change and total duration of the lithium-ion battery during the process from the start to the end of the failure gas release, as well as the total mass and total duration of the failure gas release, are obtained. The first gas release rate is determined based on the total mass change and total mass change duration of the lithium-ion battery, and the second gas release rate is determined based on the total mass release and total release duration of the failed gas. The first ratio is determined based on the ratio between the first gas release rate and the second gas release rate, and the second ratio is determined based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failure gas. Based on the release rate of the failed gas, the first ratio, and the second ratio, the total mass of the failed gas released after correction is determined. The release rate of the failed gas is determined based on the differential result between the mass of the failed gas released and the release time.

[0008] In one possible implementation, determining the first gas release rate based on the total mass change and total mass change duration of the lithium-ion battery, and determining the second gas release rate based on the total mass release and total release duration of the failed gas, includes: The first gas release rate and the second gas release rate are determined based on the following formula:

[0009] in, Indicates the rate of first gas release. This represents the total change in the mass of a lithium-ion battery. This indicates the total duration of mass change in a lithium-ion battery. This indicates the rate of second gas release. This indicates the total mass of the leaked gas. This indicates the total duration of the release of the failed gas.

[0010] In one possible implementation, determining the first ratio based on the ratio between the first gas release rate and the second gas release rate, and determining the second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas, includes: The first ratio and the second ratio are determined based on the following formula:

[0011] in, Indicates the first ratio. Indicates the rate of first gas release. This indicates the rate of second gas release. This represents the second ratio. This indicates the total duration of mass change in a lithium-ion battery. This indicates the total duration of the release of the failed gas.

[0012] In one possible implementation, determining the corrected total mass of the failed gas released based on the release rate of the failed gas, a first ratio, and a second ratio includes: The total mass of the corrected failed gas release is determined based on the following formula:

[0013] in, This represents the total mass of the leaked, corrected failure gas. This indicates the total duration of the release of the failed gas. Indicates the first ratio. This indicates the rate at which the failed gas is released. This represents the second ratio. This indicates the mass of gas released due to failure.

[0014] In one possible implementation, the method further includes: The molar mass of the failed gas is determined based on the following formula:

[0015] in, Indicates the molar mass of the failed gas. This indicates the volume ratio of the target gas component in the failed gas. This represents the molar mass of the target gas component in the failed gas, where the target gas component is any gas component in the failed gas.

[0016] In one possible implementation, the method further includes: The density of the failed gas is determined based on the following formula:

[0017] in, This indicates the density of the failed gas. Indicating environmental pressure, Indicates the molar mass of the failed gas. The gas constant is This indicates the temperature at the failed gas emission port.

[0018] In one possible implementation, the method further includes: The mass flow rate, velocity flow rate, and jet velocity of the failed gas are determined based on the following formulas:

[0019] in, Indicates the mass flow rate of the failed gas. This represents the total mass of the leaked, corrected failure gas. Indicates the velocity and flow rate of the failed gas. This indicates the density of the failed gas. This indicates the jet velocity of the failed gas. This indicates the area of ​​the failed gas emission port.

[0020] On the other hand, the present invention also provides a failure gas monitoring device for lithium-ion batteries, comprising: The acquisition module is used to acquire the total mass change and total duration of the lithium-ion battery during the process from the start to the end of the release of the failed gas, as well as the total mass and total duration of the released failed gas. The first determining module is used to determine the first gas release rate based on the total mass change and the total mass change duration of the lithium-ion battery, and to determine the second gas release rate based on the total mass release and the total release duration of the failed gas. The second determining module is used to determine a first ratio based on the ratio between the first gas release rate and the second gas release rate, and to determine a second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failure gas. The third determining module is used to determine the total mass of the failed gas after correction based on the release rate of the failed gas, the first ratio, and the second ratio. The release rate of the failed gas is determined based on the differential result between the release mass of the failed gas and the release time.

[0021] Secondly, the present invention also provides a monitoring device, including a memory and a processor, wherein, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the lithium-ion battery failure gas monitoring method described in any of the above implementations.

[0022] Thirdly, the present invention also provides a computer-readable storage medium for storing a computer-readable program or instructions, which, when executed by a processor, can implement the steps in the lithium-ion battery failure gas monitoring method described in any of the above implementations.

[0023] The beneficial effects of the present invention are as follows: The lithium-ion battery failure gas monitoring method and device provided by the present invention determine the final failure gas release mass by measuring the total mass change and total mass change duration of the lithium-ion battery, as well as the total mass release mass and total release duration of the failure gas. The monitoring results of the failure gas are corrected by the battery mass monitoring data, which effectively improves the accuracy of lithium-ion battery failure gas monitoring. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of an embodiment of the failure gas monitoring method for lithium-ion batteries provided by the present invention. Figure 2 A schematic diagram of an embodiment of the failure gas monitoring system for lithium-ion batteries provided by the present invention; Figure 3 A schematic diagram of an embodiment of the failure gas monitoring device for lithium-ion batteries provided by the present invention; Figure 4 A schematic diagram of an embodiment of the monitoring device provided by the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] In the description of the embodiments of the present invention, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0027] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This invention provides a method and apparatus for monitoring failure gases in lithium-ion batteries, which will be described below.

[0030] Figure 1 This is a schematic flowchart of an embodiment of the failure gas monitoring method for lithium-ion batteries provided by the present invention, as shown below. Figure 1 As shown, the failure gas monitoring methods for lithium-ion batteries include: S101. Obtain the total mass change and total duration of the lithium-ion battery during the process from the start to the end of the failure gas release, as well as the total mass and total duration of the failure gas release.

[0031] It should be noted that the lithium-ion battery failure gas monitoring method provided by this invention can be applied to battery failure gas monitoring scenarios, especially lithium-ion battery failure gas monitoring scenarios.

[0032] When monitoring failure gases, the monitoring equipment (such as a desktop or portable computer) can first acquire the total mass change and total duration of the lithium-ion battery during the process from the start to the end of failure gas release, as well as the total mass and total duration of the released failure gases. The mass change of the lithium-ion battery can be obtained using an electronic balance (the battery is placed on the balance during the release), and the mass of the released failure gases can be obtained using a gas analyzer. By acquiring the total mass change and total duration of the lithium-ion battery mass change, as well as the total mass and total duration of the released failure gases, a data foundation can be provided for subsequent failure gas monitoring of lithium-ion batteries.

[0033] S102. Based on the total mass change and total mass change duration of the lithium-ion battery, determine the first gas release rate, and based on the total mass release and total release duration of the failed gas, determine the second gas release rate.

[0034] It should be noted that after obtaining the total mass change and total duration of the lithium-ion battery, as well as the total mass and total duration of the released failure gas, the first gas release rate can be determined based on the total mass change and total duration of the lithium-ion battery, and the second gas release rate can be determined based on the total mass and total duration of the released failure gas.

[0035] S103. Determine a first ratio based on the ratio between the first gas release rate and the second gas release rate, and determine a second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas.

[0036] It should be noted that after determining the first gas release rate, a first ratio can be determined based on the ratio between the first gas release rate and the second gas release rate, and a second ratio can be determined based on the total duration of the lithium-ion battery mass change and the total duration of the failure gas release.

[0037] S104. Based on the release rate of the failed gas, the first ratio, and the second ratio, determine the total mass of the failed gas after correction. The release rate of the failed gas is determined based on the differential result between the mass of the failed gas released and the release time.

[0038] It should be noted that: Finally, the total mass of the failed gas can be determined based on the release rate of the failed gas (determined by the differential result between the mass of the failed gas released and the release time), the first ratio, and the second ratio. In other words, the monitoring results of the failed gas are corrected by the monitoring data of battery quality, thereby improving the accuracy of the failed gas monitoring.

[0039] In summary, the lithium-ion battery failure gas monitoring method provided by the embodiments of the present invention determines the final total mass of failure gas released by measuring the total mass change and total duration of the lithium-ion battery mass change, as well as the total mass of failure gas released and total duration of the release. The monitoring results of failure gas are corrected by monitoring data of battery mass, which effectively improves the accuracy of lithium-ion battery failure gas monitoring.

[0040] In some embodiments of the present invention, determining the first gas release rate based on the total mass change and total mass change duration of the lithium-ion battery, and determining the second gas release rate based on the total mass release and total release duration of the failed gas, includes: The first gas release rate and the second gas release rate are determined based on the following formula:

[0041] in, Indicates the rate of first gas release. This represents the total change in the mass of a lithium-ion battery. This indicates the total duration of mass change in a lithium-ion battery. This indicates the rate of second gas release. This indicates the total mass of the leaked gas. This indicates the total duration of the release of the failed gas.

[0042] It should be noted that when determining the first gas release rate based on the total mass change and total mass change duration of the lithium-ion battery, and determining the second gas release rate based on the total mass release and total release duration of the failed gas, the first gas release rate and the second gas release rate can be determined using the above formula.

[0043] In some embodiments of the present invention, determining the first ratio based on the ratio between the first gas release rate and the second gas release rate, and determining the second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas, includes: The first ratio and the second ratio are determined based on the following formula:

[0044] in, Indicates the first ratio. Indicates the rate of first gas release. This indicates the rate of second gas release. This represents the second ratio. This indicates the total duration of mass change in a lithium-ion battery. This indicates the total duration of the release of the failed gas.

[0045] It should be noted that when determining the first ratio based on the ratio between the first gas release rate and the second gas release rate, and determining the second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas, the first and second ratios can be determined according to the above formulas.

[0046] In some embodiments of the present invention, determining the corrected total mass of the failed gas released based on the release rate of the failed gas, a first ratio, and a second ratio includes: The total mass of the corrected failed gas release is determined based on the following formula:

[0047] in, This represents the total mass of the leaked, corrected failure gas. This indicates the total duration of the release of the failed gas. Indicates the first ratio. This indicates the rate at which the failed gas is released. This represents the second ratio. This indicates the mass of gas released due to failure.

[0048] It should be noted that when determining the total mass of the failed gas after correction based on the gas release rate, the first ratio, and the second ratio, the total mass of the failed gas after correction can be calculated using the above formula.

[0049] In some embodiments of the present invention, the method further includes: The molar mass of the failed gas is determined based on the following formula:

[0050] in, Indicates the molar mass of the failed gas. This indicates the volume ratio of the target gas component in the failed gas. This represents the molar mass of the target gas component in the failed gas, where the target gas component is any gas component in the failed gas.

[0051] It should be noted that when monitoring the failure gases in lithium-ion batteries, the molar mass of the failure gases can also be determined using the above formula.

[0052] In some embodiments of the present invention, the method further includes: The density of the failed gas is determined based on the following formula:

[0053] in, This indicates the density of the failed gas. Indicating environmental pressure, Indicates the molar mass of the failed gas. The gas constant is This indicates the temperature at the failed gas emission port.

[0054] It should be noted that when monitoring the failure gas of lithium-ion batteries, the density of the failure gas can also be determined using the above formula.

[0055] In some embodiments of the present invention, the method further includes: The mass flow rate, velocity flow rate, and jet velocity of the failed gas are determined based on the following formulas:

[0056] in, Indicates the mass flow rate of the failed gas. This represents the total mass of the leaked, corrected failure gas. Indicates the velocity and flow rate of the failed gas. This indicates the density of the failed gas. This indicates the jet velocity of the failed gas. This indicates the area of ​​the failed gas emission port.

[0057] It should be noted that when monitoring the failure gas of lithium-ion batteries, the mass flow rate, velocity flow rate, and jet velocity of the failure gas can also be determined using the above formulas.

[0058] Current methods for analyzing the gases generated during lithium-ion battery failure suffer from issues such as time delays, dissipation, and data asynchrony, making it impossible to accurately assess the gas hazards produced during the lithium-ion battery failure process. This invention acquires dynamic data on gas release characteristics in real time during the lithium-ion battery failure process, based on the response force signal of an electronic scale, and constructs a high-precision dynamic model of the gas release sequence, rate, composition, and outlet jet velocity.

[0059] Combination Figure 2 The failure gas monitoring process for lithium-ion batteries specifically includes: 1. Using specialized fasteners or assembly brackets, the lithium-ion battery under test, heat source, and intermediate insulation material are clamped and integrated together. It is then placed within a system capable of real-time measurement of the gravity acting on the lithium-ion battery, gas composition, and concentration. The system measures the change in the electronic scale's response force, as well as the composition and concentration of the gases. This system not only processes the concentration signals of all measured gases in real time but also simultaneously measures the real-time exhaust volume and calculates the gas mass (mg) based on the exhaust volume.

[0060] 2. Install a temperature measuring device at the lithium-ion battery outlet to measure the gas thermal characteristics.

[0061] 3. Based on multi-source signals such as electronic scale response force, gas temperature, composition, and concentration, a real-time in-situ model of gas generation during lithium-ion battery failure is constructed. This model can not only simultaneously analyze the electronic scale support force signal, temperature field, and gas composition evolution throughout the entire failure process, but also directly calculate key safety parameters such as the jet velocity at the outlet.

[0062] The calculation is performed from the start of the outlet opening to the end of the gas venting process (when the slope is close to 0), calculating the average gas venting rate based on the change in the electronic scale's response force. and the average gas release rate of the gas detector The calculation formula is as follows:

[0063] in, This represents the average gas release rate obtained based on the change in the response force of the electronic scale. This indicates the average gas release rate of the gas detector. This indicates the change in the electronic scale's response force. This indicates the total weightlessness duration that the electronic scale responds to. This indicates the change in the response force of the gas detector. This indicates the total duration of weightlessness as measured by the gas detector.

[0064] Calculate the ratio between the gas release rate based on the electronic scale's response force and the average gas release rate of the gas detector. The ratio between the total weightlessness duration based on the electronic scale's response force and the total weightlessness duration measured by the gas detector. The calculation formula is as follows:

[0065] in, This represents the average gas release rate obtained based on the change in the response force of the electronic scale. This indicates the average gas release rate of the gas detector. This indicates the total weightlessness duration that the electronic scale responds to. This indicates the total duration of weightlessness as measured by the gas detector.

[0066] Calculate the gas release rate curve of the gas detector Gas release volume The calculation formula is as follows:

[0067] in, Indicates the amount of gas released. This indicates the total duration of weightlessness measured by the gas detector. This represents the gas release rate curve of the gas detector. This indicates the response capability of the gas detector.

[0068] Calculate the molar mass of the gas mixture The calculation formula is as follows:

[0069] in, The volume ratio of gas concentration at each moment. denoted as , where represents the molar mass of each gas component.

[0070] Calculate the gas density at the lithium-ion battery outlet. The calculation formula is as follows:

[0071] in, Due to environmental pressures, The molar mass of the gas mixture. The gas constant is This refers to the outlet gas temperature.

[0072] Calculate the mass flow rate of the gas at the lithium-ion battery outlet. Speed ​​and flow and jet velocity The calculation formula is as follows:

[0073] in, Indicates the amount of gas released. This indicates the gas density at the lithium-ion battery outlet. This refers to the area of ​​exports.

[0074] Taking a high-capacity lithium iron phosphate hard-shell battery as an example, the temperature of the lithium-ion battery is increased by heating to induce thermal failure. Relevant data are measured, and an in-situ monitoring model for failure gas is established. This allows for the estimation of key safety parameters such as the jet velocity at the outlet. The entire process consists of three steps: 1. Using dedicated fasteners or assembly brackets, clamp and integrate the lithium-ion battery to be tested and the heat source together. Then, in a system that can measure the gravity, gas composition and concentration of the lithium-ion battery in real time, measure the change in the response force of the electronic scale, as well as the composition and concentration of the gas.

[0075] 2. Install a temperature measuring device at the lithium-ion battery outlet to measure the gas temperature.

[0076] 3. Based on multi-source signals such as changes in the electronic scale's response force, gas temperature, composition, and concentration, a real-time in-situ model of the failure gas in lithium-ion batteries was constructed. This model can not only simultaneously analyze the electronic scale's response force signal, temperature field, and gas composition evolution throughout the entire failure process, but also directly calculate key safety parameters such as the jet velocity at the outlet.

[0077] This invention integrates an electronic scale and a real-time gas analysis system to achieve simultaneous in-situ monitoring of response force and gas release during the failure process, significantly improving the accuracy and reliability of gas release timing and rate analysis. It not only provides crucial data support for the study of lithium-ion battery failure mechanisms but also lays the technical foundation for the development of safety design and early warning technologies for lithium-ion battery systems, and has the potential to be transformed into commercial testing services, early warning systems, and simulation data products.

[0078] To better implement the lithium-ion battery failure gas monitoring method in this embodiment of the invention, based on the lithium-ion battery failure gas monitoring method, correspondingly, as follows: Figure 3 As shown, this embodiment of the invention also provides a failure gas monitoring device for lithium-ion batteries. The failure gas monitoring device 300 for lithium-ion batteries includes: The acquisition module 301 is used to acquire the total mass change and total duration of the lithium-ion battery during the process from the start to the end of the release of the failed gas from the lithium-ion battery failure gas; and the total mass and total duration of the released failed gas. The first determining module 302 is used to determine the first gas release rate based on the total mass change and the total mass change duration of the lithium-ion battery, and to determine the second gas release rate based on the total mass release and the total release duration of the failed gas. The second determining module 303 is used to determine a first ratio based on the ratio between the first gas release rate and the second gas release rate, and to determine a second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas. The third determining module 304 is used to determine the total mass of the failed gas after correction based on the release rate of the failed gas, the first ratio, and the second ratio. The release rate of the failed gas is determined based on the differential result between the release mass of the failed gas and the release time.

[0079] The lithium-ion battery failure gas monitoring device 300 provided in the above embodiments can realize the technical solutions described in the above embodiments of the lithium-ion battery failure gas monitoring method. The specific implementation principles of each module or unit can be found in the corresponding content in the above embodiments of the lithium-ion battery failure gas monitoring method, and will not be repeated here.

[0080] like Figure 4As shown, the present invention also provides a monitoring device 400. The monitoring device 400 includes a processor 401, a memory 402, and a display 403. Figure 4 Only some components of the monitoring device 400 are shown; however, it should be understood that implementation of all shown components is not required, and more or fewer components may be implemented instead.

[0081] In some embodiments, processor 401 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 402 or process data, such as the lithium-ion battery failure gas monitoring method of the present invention.

[0082] In some embodiments, processor 401 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 401 may be local or remote. In some embodiments, processor 401 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, internal cloud, multi-cloud, etc., or any combination thereof.

[0083] In some embodiments, memory 402 may be an internal storage unit of monitoring device 400, such as a hard disk or memory of monitoring device 400. In other embodiments, memory 402 may also be an external storage device of monitoring device 400, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on monitoring device 400.

[0084] Furthermore, the memory 402 may include both internal storage units of the monitoring device 400 and external storage devices. The memory 402 is used to store the application software and various types of data installed on the monitoring device 400.

[0085] In some embodiments, display 403 may be an LED display, a liquid crystal display, a touch-screen liquid crystal display, or an organic light-emitting diode (OLED) touchscreen, etc. Display 403 is used to display information from monitoring device 400 and to display a user interface for visualization. Components 401-403 of monitoring device 400 communicate with each other via a system bus.

[0086] In one embodiment, when the processor 401 executes the lithium-ion battery failure gas monitoring program in the memory 402, the following steps can be implemented: The total mass change and total duration of the lithium-ion battery during the process from the start to the end of the failure gas release, as well as the total mass and total duration of the failure gas release, are obtained. The first gas release rate is determined based on the total mass change and total mass change duration of the lithium-ion battery, and the second gas release rate is determined based on the total mass release and total release duration of the failed gas. The first ratio is determined based on the ratio between the first gas release rate and the second gas release rate, and the second ratio is determined based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failure gas. Based on the release rate of the failed gas, the first ratio, and the second ratio, the total mass of the failed gas released after correction is determined. The release rate of the failed gas is determined based on the differential result between the mass of the failed gas released and the release time.

[0087] It should be understood that when the processor 401 executes the lithium-ion battery failure gas monitoring program in the memory 402, in addition to the functions mentioned above, it can also perform other functions, as detailed in the description of the corresponding method embodiments above.

[0088] Furthermore, this embodiment of the invention does not specifically limit the type of monitoring device 400 mentioned. The monitoring device 400 can be a portable electronic device such as a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, or laptop computer. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic devices can also be other portable electronic devices, such as laptop computers with touch-sensitive surfaces (e.g., touch panels). It should also be understood that in some other embodiments of the invention, the monitoring device 400 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0089] Accordingly, this application also provides a computer-readable storage medium for storing computer-readable programs or instructions. When the programs or instructions are executed by a processor, they can implement the steps or functions of the lithium-ion battery failure gas monitoring methods provided in the above-described method embodiments.

[0090] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0091] The failure gas monitoring method and device for lithium-ion batteries provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for monitoring failure gases in lithium-ion batteries, characterized in that, include: The total mass change and total duration of the lithium-ion battery during the process from the start to the end of the failure gas release, as well as the total mass and total duration of the failure gas release, are obtained. The first gas release rate is determined based on the total mass change and total mass change duration of the lithium-ion battery, and the second gas release rate is determined based on the total mass release and total release duration of the failed gas. The first ratio is determined based on the ratio between the first gas release rate and the second gas release rate, and the second ratio is determined based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failure gas. Based on the release rate of the failed gas, the first ratio, and the second ratio, the total mass of the failed gas released after correction is determined. The release rate of the failed gas is determined based on the differential result between the mass of the failed gas released and the release time.

2. The method for monitoring failure gases in lithium-ion batteries according to claim 1, characterized in that, The determination of the first gas release rate based on the total mass change and total mass change duration of the lithium-ion battery, and the determination of the second gas release rate based on the total mass release and total release duration of the failed gas, includes: The first gas release rate and the second gas release rate are determined based on the following formula: in, Indicates the rate of first gas release. This represents the total change in the mass of a lithium-ion battery. This indicates the total duration of mass change in a lithium-ion battery. This indicates the rate of second gas release. This indicates the total mass of the leaked gas. This indicates the total duration of the release of the failed gas.

3. The method for monitoring failure gases in lithium-ion batteries according to claim 1, characterized in that, The determination of the first ratio based on the ratio between the first gas release rate and the second gas release rate, and the determination of the second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failed gas, includes: The first ratio and the second ratio are determined based on the following formula: in, Indicates the first ratio. Indicates the rate of first gas release. This indicates the rate of second gas release. This represents the second ratio. This indicates the total duration of mass change in a lithium-ion battery. This indicates the total duration of the release of the failed gas.

4. The method for monitoring failure gases in a lithium-ion battery according to claim 1, characterized in that, The determination of the corrected total mass of the failed gas released based on the release rate of the failed gas, a first ratio, and a second ratio includes: The total mass of the corrected failed gas release is determined based on the following formula: in, This represents the total mass of the leaked, corrected failure gas. This indicates the total duration of the release of the failed gas. Indicates the first ratio. This indicates the rate at which the failed gas is released. This represents the second ratio. This indicates the mass of the failed gas released.

5. The method for monitoring failure gases in a lithium-ion battery according to claim 1, characterized in that, The method further includes: The molar mass of the failed gas is determined based on the following formula: in, Indicates the molar mass of the failed gas. This indicates the volume ratio of the target gas component in the failed gas. This represents the molar mass of the target gas component in the failed gas, where the target gas component is any gas component in the failed gas.

6. The method for monitoring failure gases in a lithium-ion battery according to claim 5, characterized in that, The method further includes: The density of the failed gas is determined based on the following formula: in, This indicates the density of the failed gas. Indicating environmental pressure, Indicates the molar mass of the failed gas. The gas constant is... This indicates the temperature at the failed gas emission port.

7. The method for monitoring failure gases in a lithium-ion battery according to claim 6, characterized in that, The method further includes: The mass flow rate, velocity flow rate, and jet velocity of the failed gas are determined based on the following formulas: in, Indicates the mass flow rate of the failed gas. This represents the total mass of the leaked, corrected failure gas. Indicates the velocity and flow rate of the failed gas. This indicates the density of the failed gas. This indicates the jet velocity of the failed gas. This indicates the area of ​​the failed gas emission port.

8. A failure gas monitoring device for lithium-ion batteries, characterized in that, include: The acquisition module is used to acquire the total mass change and total duration of the lithium-ion battery during the process from the start to the end of the release of the failed gas, as well as the total mass and total duration of the released failed gas. The first determining module is used to determine the first gas release rate based on the total mass change and the total mass change duration of the lithium-ion battery, and to determine the second gas release rate based on the total mass release and the total release duration of the failed gas. The second determining module is used to determine a first ratio based on the ratio between the first gas release rate and the second gas release rate, and to determine a second ratio based on the total duration of mass change of the lithium-ion battery and the total duration of release of the failure gas. The third determining module is used to determine the total mass of the failed gas after correction based on the release rate of the failed gas, the first ratio, and the second ratio. The release rate of the failed gas is determined based on the differential result between the release mass of the failed gas and the release time.

9. A monitoring device, characterized in that, Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the failure gas monitoring method for lithium-ion batteries according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps in the failure gas monitoring method for lithium-ion batteries according to any one of claims 1 to 7.

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