Battery pack thermal runaway gas production rate test device

Abstract

The utility model discloses a battery pack thermal runaway gas production rate testing arrangement, include: box and test subassembly, the box forms and tests the cavity and exhaust port, and the test cavity is used for placing the battery subassembly of the battery pack of measurement, and the test cavity is connected with exhaust port, and the test subassembly includes flow detection module, and flow detection module is located at the exhaust port place, to be used for detecting the exhaust rate of battery subassembly at the exhaust port under the thermal runaway state. According to the battery pack thermal runaway gas production rate testing arrangement of the utility model, through the exhaust rate after the thermal runaway of battery subassembly in the test box, provide data basis for the selection of battery pack's explosion -proof valve, and through the flow detection module is located at the exhaust port place, can directly and accurately obtain the exhaust rate after the thermal runaway of battery subassembly, so as to be convenient for according to the exhaust rate after the thermal runaway of battery subassembly, accurately select the specification of explosion -proof valve and optimize the battery box structure of battery pack, to can improve the safety when battery pack thermal runaway.

Description

Technical Field

[0001] This utility model relates to the technical field of battery pack testing devices, and in particular to a battery pack thermal runaway gas generation rate testing device. Background Technology

[0002] In the production and design process of battery packs, thermal runaway testing is typically required to improve the controllability of the battery pack after thermal runaway. The selection of the explosion-proof valve used to vent gases from inside the battery pack is particularly important. Improper selection of the explosion-proof valve can lead to deformation, cracking, or even explosion of the battery pack during thermal runaway, directly impacting its safety. Utility Model Content

[0003] This invention proposes a battery pack thermal runaway gas generation rate testing device. The device can test the gas generation rate of the battery components after thermal runaway inside the enclosure, providing a basis for the selection of explosion-proof valves. Furthermore, by setting a flow sensor at the exhaust port, the gas generation rate of the battery components after thermal runaway can be obtained directly and accurately.

[0004] A battery pack thermal runaway gas generation rate testing device according to an embodiment of the present invention includes: a housing having a test chamber and an exhaust port, the test chamber being used to place the battery components of the battery pack to be tested, and the test chamber being connected to the exhaust port; and a test component including a flow detection module located at the exhaust port for detecting the exhaust rate of the battery components at the exhaust port under thermal runaway conditions.

[0005] According to the battery pack thermal runaway gas generation rate testing device of this utility model embodiment, by testing the gas generation rate of the battery components after thermal runaway in the test chamber, it provides data basis for the selection of the explosion-proof valve of the battery pack. Furthermore, by setting the flow detection module at the exhaust port, the gas generation rate of the battery components after thermal runaway can be directly and accurately obtained, so as to accurately select the specifications of the explosion-proof valve and optimize the battery box structure of the battery pack based on the gas generation rate of the battery components after thermal runaway, thereby improving the safety of the battery pack when thermal runaway occurs.

[0006] According to some embodiments of the present invention, the flow detection module includes a test tube and a flow sensor. One end of the test tube is connected to the exhaust port and the other end of the test tube is located outside the housing. The flow sensor is disposed in the test tube to detect the exhaust rate inside the test tube.

[0007] According to some embodiments of the present invention, the test assembly further includes a temperature sensor disposed in the test tube body for detecting the exhaust temperature inside the test tube body of the battery assembly under thermal runaway conditions.

[0008] According to some embodiments of the present invention, the temperature sensor is located downstream of the flow sensor along the airflow direction within the test tube.

[0009] According to some embodiments of the present invention, the test assembly further includes a pressure sensor disposed in the test tube body for detecting the exhaust pressure inside the test tube body of the battery assembly under thermal runaway conditions.

[0010] According to some embodiments of the present invention, at least two pressure sensors are provided, with at least one pressure sensor located upstream of the flow sensor and at least one pressure sensor located downstream of the flow sensor along the airflow direction within the test tube.

[0011] According to some embodiments of the present invention, the test assembly further includes a temperature sensor disposed in the test tube body along the airflow direction inside the test tube body. The temperature sensor is located downstream of the flow sensor, and the pressure sensor located downstream of the flow sensor and the temperature sensor are arranged circumferentially at intervals along the test tube body.

[0012] According to some embodiments of the present invention, the battery pack thermal runaway gas generation rate testing device further includes an explosion-proof valve, which is located at the outlet end of the test tube.

[0013] According to some embodiments of the present invention, the test assembly further includes a temperature sensor and a pressure sensor. The temperature sensor and the pressure sensor are both disposed in the test tube body. Along the extension direction of the test tube body, the flow sensor, the temperature sensor, and the pressure sensor are all located between the exhaust port and the explosion-proof valve. The temperature sensor is used to detect the exhaust temperature of the battery assembly in the test tube body under thermal runaway conditions, and the pressure sensor is used to detect the exhaust pressure of the battery assembly in the test tube body under thermal runaway conditions.

[0014] According to some embodiments of the present invention, the battery pack thermal runaway gas generation rate testing device further includes: a charging and discharging device located outside the housing, the charging and discharging device being used for electrical connection with the battery assembly inside the housing.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery pack thermal runaway gas generation rate testing device according to an embodiment of the present utility model; Figure 2 This is a partial cross-sectional view of a battery pack thermal runaway gas generation rate testing device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the test components and explosion-proof valve of the battery pack thermal runaway gas generation rate test device according to an embodiment of the present invention.

[0017] Figure label: 100. Battery pack thermal runaway gas generation rate testing device; 1. Chamber; 11. Test chamber; 12. Exhaust port; 2. Test components; 21. Flow detection module; 211. Test tube; 212. Flow sensor; 22. Temperature sensor; 23. Pressure sensor; 3. Explosion-proof valve; 4. Charging and discharging device; 5. Data acquisition device. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0022] In the description of this utility model, "multiple" means two or more.

[0023] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0024] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0025] The following description, with reference to the accompanying drawings, describes a battery pack thermal runaway gas generation rate testing device 100 according to an embodiment of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the battery pack thermal runaway gas generation rate testing device 100 according to an embodiment of the present invention includes: a housing 1 and a testing component 2. The housing 1 forms a testing chamber 11 and an exhaust port 12. The testing chamber 11 is used to place the battery components of the battery pack to be tested. The testing chamber 11 is connected to the exhaust port 12. The testing component 2 includes a flow detection module 21, which is located at the exhaust port 12 to detect the exhaust rate of the battery components at the exhaust port 12 under thermal runaway conditions. The battery components may include multiple individual battery cells.

[0027] In other words, the battery components of the battery pack to be tested are placed inside the test chamber 11. When the battery components in the test chamber 11 experience thermal runaway, the generated gas flows towards the exhaust port 12 and is discharged from the test chamber 11 through the exhaust port 12. The exhaust rate at the exhaust port is obtained through the flow detection module 21, which can obtain the gas generation rate after the battery components experience thermal runaway. Therefore, the gas generation rate after the battery components experience thermal runaway inside the housing 1 can provide data for the selection of the explosion-proof valve of the battery pack. Furthermore, since the flow detection module 21 is located at the exhaust port 12, it can obtain the exhaust rate at the exhaust port 12 in real time and accurately. This allows for the direct and accurate acquisition of the gas generation rate after the battery components experience thermal runaway. Based on the gas generation rate after the battery components experience thermal runaway, the specifications of the explosion-proof valve 3 can be accurately selected, and the battery box structure of the battery pack can be optimized. For example, it can prevent the battery box of the battery pack from deforming, cracking, or even exploding due to improper selection of the explosion-proof valve 3, thereby improving the safety of the battery pack when thermal runaway occurs.

[0028] Therefore, by setting the flow detection module 21 at the exhaust port 12 to detect the exhaust rate of the battery pack at the exhaust port 12 under thermal runaway conditions, the gas generation rate of the battery pack after thermal runaway can be obtained directly and accurately. This allows for the accurate selection of the specifications of the explosion-proof valve 3 and optimization of the battery pack's battery box structure based on the gas generation rate after thermal runaway, thereby improving the safety of the battery pack when thermal runaway occurs.

[0029] According to the embodiment of the present invention, the battery pack thermal runaway gas generation rate testing device 100 provides data basis for the selection of the explosion-proof valve of the battery pack by testing the gas generation rate of the battery components after thermal runaway in the test chamber 1. Furthermore, by setting the flow detection module 21 at the exhaust port 12, the gas generation rate of the battery components after thermal runaway can be obtained directly and accurately. This allows for the accurate selection of the specifications of the explosion-proof valve 3 and optimization of the battery box structure of the battery pack based on the gas generation rate of the battery components after thermal runaway, thereby improving the safety of the battery pack when thermal runaway occurs.

[0030] In some embodiments, the test component 2 is located outside the housing 1, which reduces the installation difficulty of the test component 2 and facilitates the output of data from the test component 2 to the outside. For example, the battery pack thermal runaway gas generation rate testing device 100 also includes a data acquisition unit 5, which is electrically connected to the flow detection module 21 to collect the exhaust rate data detected by the flow detection module 21. In addition, the housing 1 is the battery box of the battery pack, that is, the battery pack includes the battery box and the battery components disposed in the battery box. Using the battery box of the battery pack to be tested as the housing 1 can more accurately simulate the normal use state of the battery pack, thereby more accurately obtaining the gas generation rate of the battery components in the battery pack during thermal runaway, and thus improving the rationality of the selection of the explosion-proof valve 3 and the structural strength design of the battery box.

[0031] According to some embodiments of this utility model, the flow detection module 21 includes a test tube 211 and a flow sensor 212. One end of the test tube 211 is connected to the exhaust port 12, and the other end of the test tube 211 is located outside the housing 1. The flow sensor 212 is disposed in the test tube 211 to detect the exhaust rate inside the test tube 211. That is, the test chamber 11 is connected to the test tube 211 through the exhaust port 12, and the exhaust port 12 is connected to the external space through the test tube 211. A large amount of gas generated by the thermal runaway of the battery module is discharged to the external space through the exhaust port 12 and the test tube 211 in sequence. The flow sensor 212 disposed in the test tube 211 can detect the exhaust rate inside the test tube 211 in real time and accurately, so as to directly and accurately obtain the gas generation rate of the battery module during thermal runaway in the test chamber 11. This allows for accurate selection of the specifications of the explosion-proof valve 3 and optimization of the battery box structure of the battery pack based on the gas generation rate after the thermal runaway of the battery module, thereby improving the safety of the battery pack during thermal runaway.

[0032] In a specific example, the flow detection module 21 is a turbine-type flow sensor. Specifically, when fluid flows into the test tube 211, the exhaust airflow is rectified and accelerated by a dedicated integrated rectifier located at the air inlet of the test tube 211. The flow sensor 212 includes a rotatable turbine blade disposed within the test tube 211. The rotation axis of the turbine blade extends along the airflow direction within the test tube 211, and the turbine blade forms a certain angle with the fluid flow direction. When the airflow passes through the worm gear, the turbine blade generates a rotational torque under the push of the airflow. After overcoming the frictional torque and fluid resistance torque, the turbine blade begins to rotate. Within a certain flow range, the angular velocity of the turbine blade rotation is proportional to the volumetric flow rate of the exhaust air within the test tube 211. Based on the principle of electromagnetic induction, a magnetic sensor senses a pulse signal proportional to the fluid volumetric flow rate from a coaxially rotating signal wheel. This pulse signal is transmitted to the data acquisition unit 5, thereby completing the measurement of the exhaust velocity and flow rate within the test tube 211.

[0033] According to some embodiments of this utility model, the test assembly 2 further includes a temperature sensor 22, which is disposed in the test tube 211 to detect the exhaust temperature inside the test tube 211 when the battery assembly is in a thermal runaway state. That is, both the flow sensor 212 and the temperature sensor 22 are mounted on the test tube 211, which can significantly improve the integration of the test assembly 2 and reduce the space occupied by the test assembly 2. Furthermore, by detecting the exhaust temperature inside the test tube 211, the exhaust temperature of the battery pack during thermal runaway can be accurately obtained. Therefore, an appropriate explosion-proof valve 3 can be selected based on the exhaust temperature; that is, it is necessary to ensure that the exhaust temperature during thermal runaway of the battery assembly is within the temperature range that the explosion-proof valve 3 can withstand, thereby improving the rationality of the selection of the explosion-proof valve 3.

[0034] According to some embodiments of this invention, along the airflow direction within the test tube 211, the temperature sensor 22 is located downstream of the flow sensor 212. That is, during the thermal runaway of the battery assembly, as a large amount of gas is discharged through the test tube 211, it first flows through the flow sensor 212 and then through the temperature sensor 22; that is, the temperature sensor 22 is closer to the outlet end of the test tube 211 than the flow sensor 212. Therefore, placing the temperature sensor 22 in the area upstream of the flow sensor 212 within the test tube 211 avoids creating airflow resistance, thereby improving the accuracy of the flow sensor 212 in detecting the gas generation rate during thermal runaway of the battery assembly.

[0035] Furthermore, in some embodiments, the explosion-proof valve 3 is located at the outlet end of the test tube 211, and the temperature sensor 22 is located downstream of the flow sensor 212. The temperature sensor 22 can more accurately obtain the exhaust temperature at the outlet end of the test tube 211. In other words, the temperature sensor 22 can detect the exhaust temperature near the explosion-proof valve 3 in the test tube 211, thereby providing more accurate temperature data for the selection of the explosion-proof valve 3.

[0036] According to some embodiments of this utility model, the test component 2 further includes a pressure sensor 23, which is disposed on the test tube 211 to detect the exhaust pressure inside the test tube 211 when the battery pack is in a thermal runaway state. That is, both the flow sensor 212 and the pressure sensor 23 are installed on the test tube 211, which can improve the integration of the test component 2 and reduce the space occupied by the test component 2. Furthermore, by detecting the exhaust pressure inside the test tube 211, the exhaust pressure of the battery pack during thermal runaway can be accurately obtained, allowing for the selection of a suitable explosion-proof valve 3 based on the exhaust pressure. Specifically, it is necessary to ensure that the exhaust pressure during thermal runaway of the battery pack is within the pressure range that the explosion-proof valve 3 can withstand, thereby improving the rationality of the explosion-proof valve 3 selection. In addition, the presence of cracks in the housing 1 can determine whether the structural strength of the housing 1 meets the requirements during thermal runaway of the battery pack. In other words, if cracks appear in the housing 1 due to deformation during thermal runaway of the battery pack, the structural strength of the housing 1 needs to be strengthened, thus providing pressure parameter references for the strength design of the battery pack's battery box.

[0037] According to some embodiments of this utility model, at least two pressure sensors 23 are provided. Along the airflow direction inside the test tube 211, at least one pressure sensor 23 is located upstream of the flow sensor 212, and at least one pressure sensor 23 is located downstream of the flow sensor 212. That is, after the battery assembly in the test chamber 11 experiences thermal runaway, the generated gas enters the test tube 211 and flows sequentially through the pressure sensor 23 located upstream of the flow sensor 212, the flow sensor 212, and the pressure sensor 23 located downstream of the flow sensor 212.

[0038] The pressure sensor 23, located upstream of the flow sensor 212, acquires the airflow pressure within the test tube 211 upstream of the flow sensor 212; this pressure is denoted as the first airflow pressure. Similarly, the pressure sensor 23, located downstream of the flow sensor 212, acquires the airflow pressure within the test tube 211 downstream of the flow sensor 212; this pressure is denoted as the second airflow pressure. By calculating the difference between the first and second airflow pressures (specifically, subtracting the second airflow pressure from the first), the pressure drop generated when the airflow passes through the flow sensor 212 can be obtained. This pressure drop allows for assessment of whether the flow sensor 212 is functioning correctly and its impact on the exhaust pressure, thereby improving the accuracy of the data acquired by the test component 2. This, in turn, provides more accurate data for the selection of the explosion-proof valve 3 and the design of the structural strength of the housing 1.

[0039] According to some embodiments of the present invention, the test assembly 2 further includes a temperature sensor 22, which is disposed in the test tube 211. Along the airflow direction inside the test tube 211, the temperature sensor 22 is located downstream of the flow sensor 212. The pressure sensor 23 located downstream of the flow sensor 212 and the temperature sensor 22 are arranged circumferentially around the test tube 211. Therefore, the pressure sensor 23 and temperature sensor 22 located downstream of the flow sensor 212 can make full use of the circumferential space of the test tube 211 for arrangement, thereby reducing the space occupied by the pressure sensor 23 and temperature sensor 22 located downstream of the flow sensor 212 along the extension direction of the test tube 211. For example, if the length of the test tube 211 is fixed, the pressure sensor 23 and temperature sensor 22 located downstream of the flow sensor 212 can be arranged at circumferential intervals along the test tube 211, which can avoid the pressure sensor 23 and temperature sensor 22 located downstream of the flow sensor 212 from being too crowded and causing interference, and can reduce the installation difficulty of the pressure sensor 23 and temperature sensor 22 located downstream of the flow sensor 212.

[0040] According to some embodiments of this utility model, the battery pack thermal runaway gas generation rate testing device 100 further includes an explosion-proof valve 3, which is located at the outlet end of the test tube 211. That is, the explosion-proof valve 3 is connected to the housing 1 via the test tube 211. When the battery assembly in the test chamber 11 experiences thermal runaway, the generated gas flows through the exhaust port 12 and the test tube 211 to the explosion-proof valve 3, and then breaks through the explosion-proof valve 3 to be discharged to the outside. By placing the explosion-proof valve 3 at the outlet end of the test tube 211, the exhaust state during battery pack thermal runaway can be simulated more accurately. Furthermore, the specifications of the explosion-proof valve 3 can be adjusted based on its current specifications and the gas generation rate obtained by the flow sensor 212. For example, if the current explosion-proof valve 3 cannot meet the thermal runaway exhaust requirements, the required exhaust capacity of the explosion-proof valve 3 can be determined based on the gas generation rate obtained by the flow sensor 212, thus allowing for more accurate selection of the explosion-proof valve 3.

[0041] According to some embodiments of this utility model, the test assembly 2 further includes a temperature sensor 22 and a pressure sensor 23. Both the temperature sensor 22 and the pressure sensor 23 are disposed in the test tube 211. Along the extending direction of the test tube 211, the flow sensor 212, temperature sensor 22, and pressure sensor 23 are all located between the exhaust port 12 and the explosion-proof valve 3. The temperature sensor 22 is used to detect the exhaust temperature inside the test tube 211 of the battery assembly under thermal runaway conditions, and the pressure sensor 23 is used to detect the exhaust pressure inside the test tube 211 of the battery assembly under thermal runaway conditions. In other words, the data detected by the flow sensor 212, temperature sensor 22, and pressure sensor 23 are all data before the airflow is discharged through the explosion-proof valve 3, thereby avoiding the influence of the explosion-proof valve 3 on the flow, temperature, and pressure data, and improving the accuracy of the flow, temperature, and pressure data detected by the test assembly 2.

[0042] In some embodiments, both temperature sensor 22 and pressure sensor 23 are electrically connected to data acquisition unit 5 so that data acquisition unit 5 can simultaneously acquire exhaust flow, pressure and temperature data in test tube 211.

[0043] According to some embodiments of this utility model, the battery pack thermal runaway gas generation rate testing device 100 further includes a charging and discharging device 4, located outside the housing 1, for electrical connection with the battery assembly inside the housing 1. Therefore, by electrically connecting the charging and discharging device 4 to the battery assembly inside the housing 1 (i.e., the battery assembly under test), the battery assembly can be overcharged using the charging and discharging device 4 to induce thermal runaway, thereby achieving controllable thermal runaway of the battery assembly and ensuring stable testing. Furthermore, placing the charging and discharging device 4 outside the housing 1 reduces the operational difficulty of the device.

[0044] It should be noted that the above is only an explanation of one type of battery pack thermal runaway method, and is not a limitation on the battery pack thermal runaway method. In some embodiments, the battery pack can also be thermally runaway by heating the battery assembly, such as by installing a heating component on the battery assembly, and using the heating component to make the temperature of the battery assembly exceed a safety threshold to cause thermal runaway; in other embodiments, the battery pack can also be thermally runaway by physical collision, compression, puncture, etc., which will not be described in detail here.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A device for testing the rate of gas generation during thermal runaway of a battery pack, characterized in that, include: The housing has a test chamber and an exhaust port. The test chamber is used to place the battery components of the battery pack to be tested, and the test chamber is connected to the exhaust port. The test component includes a flow detection module located at the exhaust port to detect the exhaust rate of the battery assembly at the exhaust port under thermal runaway conditions.

2. The battery pack thermal runaway gas generation rate testing device according to claim 1, characterized in that, The flow detection module includes a test tube and a flow sensor. One end of the test tube is connected to the exhaust port and the other end of the test tube is located outside the housing. The flow sensor is located in the test tube to detect the exhaust rate inside the test tube.

3. The battery pack thermal runaway gas generation rate testing device according to claim 2, characterized in that, The test assembly also includes a temperature sensor disposed in the test tube to detect the exhaust temperature inside the test tube when the battery assembly is in a thermal runaway state.

4. The battery pack thermal runaway gas generation rate testing device according to claim 3, characterized in that, Along the airflow direction within the test tube, the temperature sensor is located downstream of the flow sensor.

5. The battery pack thermal runaway gas generation rate testing device according to claim 2, characterized in that, The test assembly also includes a pressure sensor disposed in the test tube to detect the exhaust pressure inside the test tube when the battery assembly is in a thermal runaway state.

6. The battery pack thermal runaway gas generation rate testing device according to claim 5, characterized in that, At least two pressure sensors are provided, with at least one pressure sensor located upstream of the flow sensor and at least one pressure sensor located downstream of the flow sensor along the airflow direction within the test tube.

7. The battery pack thermal runaway gas generation rate testing device according to claim 6, characterized in that, The test assembly also includes a temperature sensor, which is disposed in the test tube body along the airflow direction inside the test tube body. The temperature sensor is located downstream of the flow sensor, and the pressure sensor located downstream of the flow sensor is arranged circumferentially with the temperature sensor along the test tube body.

8. The battery pack thermal runaway gas generation rate testing device according to claim 2, characterized in that, Also includes: An explosion-proof valve is provided at the outlet end of the test tube.

9. The battery pack thermal runaway gas generation rate testing device according to claim 8, characterized in that, The test assembly also includes a temperature sensor and a pressure sensor, both of which are located in the test tube. Along the extension direction of the test tube, the flow sensor, the temperature sensor, and the pressure sensor are all located between the exhaust port and the explosion-proof valve. The temperature sensor is used to detect the exhaust temperature inside the test tube of the battery assembly under thermal runaway conditions, and the pressure sensor is used to detect the exhaust pressure inside the test tube of the battery assembly under thermal runaway conditions.

10. The battery pack thermal runaway gas generation rate testing device according to any one of claims 1-9, characterized in that, Also includes: A charging and discharging device is located outside the housing and is used to electrically connect to the battery assembly inside the housing.

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