A lithium battery thermal runaway gas online monitoring device

Abstract

The utility model discloses a lithium battery thermal runaway gas on -line monitoring device belongs to gas on -line monitoring technical field, including pressure container, the pressure container is placed with the lithium battery of measuring, be equipped with gas outlet and gas inlet on the pressure container, sampling pump, sampling pump is connected through first pipe line with the gas outlet of pressure container to export the gas in pressure container, analyzer, be equipped with gas inlet and gas outlet on the analyzer, the gas inlet is connected with sampling pump through second pipe line, the gas outlet is connected through third pipe line with the gas inlet of pressure container. The utility model has realized the gas on -line monitoring of lithium battery, and it can real -time, on -line monitoring concentration change of various gases in lithium battery thermal runaway process, provides data support for thermal runaway early warning and safety protection, and the structure is simple, realizes the automatic control of gas on -line monitoring, and its operation is simple, and effectively reduces test cost and manpower cost.

Description

Technical Field

[0001] This utility model belongs to the field of gas online monitoring technology, and in particular relates to an online monitoring device for thermal runaway gas in lithium batteries. Background Technology

[0002] With the widespread use of lithium batteries, their safety issues have become increasingly prominent. Thermal runaway is one of the most serious safety incidents involving lithium batteries, leading to severe consequences such as battery fires and explosions. Thermal runaway testing is typically required to assess the safety of lithium batteries. Conducting thermal runaway tests in a closed environment can more realistically simulate the thermal runaway scenarios that occur during actual battery use.

[0003] Currently, gas monitoring for thermal runaway testing of lithium batteries in a confined environment mainly employs offline sampling and analysis methods. This method has the following limitations:

[0004] 1. Poor real-time performance: Offline sampling and analysis requires gas samples to be collected and sent to the laboratory for analysis. It is impossible to obtain gas concentration data in real time, making it difficult to detect signs of thermal runaway in a timely manner.

[0005] 2. Cumbersome operation: The offline sampling and analysis process is cumbersome, requires manual intervention, increases testing and labor costs, and affects testing accuracy;

[0006] 3. Incomplete information: Offline sampling analysis can only obtain gas concentration data at limited time points, and cannot fully reflect the dynamic changes in gas release during thermal runaway. Utility Model Content

[0007] This invention overcomes the shortcomings of the prior art by providing an online monitoring device for thermal runaway gas in lithium batteries, thereby solving the problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an online monitoring device for thermal runaway gas in lithium batteries, comprising...

[0009] A pressure vessel containing a lithium battery to be tested, and the pressure vessel having an outlet and an inlet.

[0010] A sampling pump is connected to the outlet of the pressure vessel via a first pipeline to exhaust the gas inside the pressure vessel.

[0011] The analyzer has a gas inlet and a gas outlet. The gas inlet is connected to the sampling pump through a second pipeline, and the gas outlet is connected to the gas inlet of the pressure vessel through a third pipeline.

[0012] In a preferred embodiment of this utility model, both the first pipeline and the third pipeline are equipped with solenoid valves to control the on / off state of the first pipeline or the third pipeline.

[0013] In a preferred embodiment of this invention, a filter is provided on the first pipeline to filter the gas before it enters the sampling pump.

[0014] In a preferred embodiment of this invention, a pressure regulating valve is provided on the second pipeline to regulate the gas pressure before it enters the analyzer.

[0015] In a preferred embodiment of this invention, the analyzer is a Fourier transform infrared spectrometer.

[0016] In a preferred embodiment of this invention, the pressure vessel is a sealed container.

[0017] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0018] 1. The lithium battery thermal runaway gas online monitoring device of this utility model realizes online gas monitoring of lithium battery. It can monitor the concentration changes of various gases in real time and online during the thermal runaway process of lithium battery, and provide data support for thermal runaway early warning and safety protection.

[0019] 2. This utility model has a simple structure and realizes automated control of online gas monitoring. It is easy to operate and effectively reduces testing costs and labor costs. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present utility model;

[0022] Figure 2 This is a front view of a preferred embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the pressure vessel according to a preferred embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the analyzer according to a preferred embodiment of the present invention;

[0025] In the diagram: 10, pressure vessel; 11, outlet; 12, inlet; 20, sampling pump; 30, analyzer; 31, gas inlet; 32, gas outlet; 40, first pipeline; 50, second pipeline; 60, third pipeline; 70, solenoid valve; 80, filter; 90, pressure regulating valve. Detailed Implementation

[0026] The following drawings will disclose several embodiments of this utility model. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these physical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0027] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] This embodiment provides an online monitoring device for thermal runaway gases in lithium batteries. This device enables online monitoring of gases in lithium batteries, allowing for real-time, online monitoring of the concentration changes of various gases during thermal runaway. It provides data support for thermal runaway early warning and safety protection. Furthermore, it has a simple structure, achieves automated control of online gas monitoring, and is easy to operate, effectively reducing testing and labor costs.

[0029] Combination Figures 1 to 4 As shown, the lithium battery thermal runaway gas online monitoring device of this embodiment includes a pressure vessel 10, a sampling pump 20, and an analyzer 30. The lithium battery to be tested is placed in the pressure vessel 10, which is a closed container to provide a closed test environment for online monitoring of lithium battery thermal runaway gas. The sampling pump 20 can extract the gas and transfer it to the analyzer 30 for analysis and processing to obtain relevant detection data. After the analyzer 30 completes the gas analysis, the gas is returned to the pressure vessel 10.

[0030] In this embodiment, the analyzer 30 is a Fourier transform infrared (FTIR) spectrometer. Using a Fourier transform infrared spectrometer as the analyzer 30 offers the following advantages: FTIR spectrometers do not require calibration with standard gases, simplifying the operation process and reducing operating costs; they enable rapid, continuous, automated, and real-time quantification of gas components, meeting the real-time requirements of thermal runaway testing; they have a wide detection range, meeting the detection needs of gases with different concentrations during thermal runaway; they employ advanced spectral fitting algorithms to automatically identify and compensate for the influence of interfering gases, improving the accuracy of gas component analysis; they have a built-in precise spectral database, enabling accurate identification and quantitative analysis of multiple gas components; and their database contains reference spectra of over 350 compounds, meeting the detection needs of multiple gas components during thermal runaway.

[0031] Combination Figure 1 , Figure 3 as well as Figure 4 As shown, the pressure vessel 10 in this embodiment is provided with an outlet 11 and an inlet 12. The sampling pump 20 is connected to the outlet 11 of the pressure vessel 10 through a first pipeline 40 to export the gas inside the pressure vessel 10. The analyzer 30 is provided with a gas inlet 31 and a gas outlet 32. The gas inlet 31 is connected to the sampling pump 20 through a second pipeline 50, and the gas outlet 32 ​​is connected to the inlet 12 of the pressure vessel 10 through a third pipeline 60. After the lithium battery generates test gas inside the pressure vessel 10, the sampling pump 20 is started. Under the negative pressure generated by the sampling pump 20, the gas is exported from the outlet 11 of the pressure vessel 10, enters the sampling pump 20 through the first pipeline 40, and then enters the analyzer 30 through the second pipeline 50, where the analyzer 30 analyzes and detects the gas.

[0032] In this embodiment, a solenoid valve 70 is provided on both the first pipeline 40 and the third pipeline 60 to control the opening and closing of the first pipeline 40 or the third pipeline 60. A pressure regulating valve 90 is provided on the second pipeline 50 to regulate the gas pressure before it enters the analyzer 30. In this embodiment, there are two solenoid valves 70, which control the opening and closing of the first pipeline 40 and the third pipeline 60 respectively. The pressure regulating valve 90 can adjust the pumping pressure of the sampling pump 20 to make the gas flow into the analyzer 30 more stably.

[0033] Furthermore, a filter 80 is provided on the first pipeline 40 to filter the gas before it enters the sampling pump 20. In this embodiment, the filter 80 can filter and dehumidify the gas, remove impurities in the gas, and thus improve the accuracy of subsequent detection.

[0034] In practical use, the lithium battery thermal runaway gas online monitoring device of this embodiment has the lithium battery located inside the pressure vessel 10. When the lithium battery experiences thermal runaway, the generated gas is located inside the pressure vessel 10. Under the action of the sampling pump 20, the gas is discharged from the gas outlet 11 of the pressure vessel 10, enters the analyzer 30 through the first pipeline 40 and the second pipeline 50, and after the analyzer 30 tests and analyzes the gas, the gas is discharged from the gas outlet 32 ​​of the analyzer 30 and enters the pressure vessel 10 through the third pipeline 60.

[0035] While the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the present invention. That is, the methods, systems, or devices discussed above are merely examples. Various configurations can be appropriately omitted, substituted, or added to various processes or components. For example, in alternative configurations, methods can be performed in a different order than described, and / or various stages can be added, omitted, and / or combined. Moreover, features described with respect to certain configurations can be combined in various other configurations. Different aspects and elements of the configuration can be combined in a similar manner. Furthermore, as technology develops, many elements are merely examples and do not limit the scope of this disclosure or the claims.

[0036] Specific details are provided in the specification to offer a thorough understanding of exemplary configurations, including implementations. However, configurations can be practiced without these specific details; for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail to avoid obscuring the configuration. This description provides only exemplary configurations and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes can be made to the function and arrangement of the elements without departing from the spirit or scope of this disclosure.

[0037] Furthermore, although each operation can be described as a sequential process, many operations can be executed in parallel or simultaneously. Additionally, the order of operations can be rearranged. A process may have additional steps. Moreover, examples of methods can be implemented using hardware, software, firmware, middleware, code, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or code, the program code or code segments used to perform the necessary tasks can be stored in a non-transitory computer-readable medium such as a storage medium and executed by a processor.

[0038] In summary, the above detailed description is intended to be exemplary and not restrictive, and it should be understood that the claims (including all equivalents) are intended to define the spirit and scope of this invention. These embodiments should be understood as illustrative only and not as limiting the scope of protection of this invention. After reading the description of this invention, those skilled in the art can make various alterations or modifications to it, and these equivalent changes and modifications also fall within the scope defined by the claims of this invention.

Claims

1. An online monitoring device for thermal runaway gas in lithium batteries, characterized in that, include A pressure vessel (10) is provided with a lithium battery to be tested inside the pressure vessel (10) and an air outlet (11) and an air inlet (12). A sampling pump (20) is connected to the outlet (11) of the pressure vessel (10) via a first pipeline (40) to exhaust the gas inside the pressure vessel (10). The analyzer (30) is provided with a gas inlet (31) and a gas outlet (32). The gas inlet (31) is connected to the sampling pump (20) through a second pipeline (50), and the gas outlet (32) is connected to the air inlet (12) of the pressure vessel (10) through a third pipeline (60).

2. The online monitoring device for thermal runaway gas in a lithium battery according to claim 1, characterized in that, Both the first pipeline (40) and the third pipeline (60) are equipped with solenoid valves (70) to control the opening and closing of the first pipeline (40) or the third pipeline (60).

3. The online monitoring device for thermal runaway gas in a lithium battery according to claim 1 or 2, characterized in that, A filter (80) is provided on the first pipeline (40) to filter the gas before it enters the sampling pump (20).

4. The online monitoring device for thermal runaway gas in a lithium battery according to claim 1, characterized in that, The second pipeline (50) is equipped with a pressure regulating valve (90) to regulate the gas pressure before it enters the analyzer (30).

5. The online monitoring device for thermal runaway gas in a lithium battery according to claim 1, characterized in that, The analyzer (30) is a Fourier transform infrared spectrometer.

6. The online monitoring device for thermal runaway gas in a lithium battery according to claim 1, characterized in that, The pressure vessel (10) is a closed container.

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