Closed pressure storage tank for collecting thermal runaway produced gas of lithium ion battery

Abstract

The invention discloses a closed pressure storage tank for collecting gas produced by thermal runaway of a lithium ion battery. The closed pressure storage tank comprises a closed test space defined by a tank body and a gland, the gland is provided with a gas collection interface, a sensor interface, a pressure release valve interface, an anti-explosion valve interface and a line plug interface; and transparent observation windows are arranged on the tank body and the gland. The runaway process of the thermal runaway gas production device can be observed through the observation windows on the tank body and the gland, the sensor interface is connected with a pressure sensor to monitor the pressure condition in the tank body, and the gas collection interface is connected with a gas collection element to collect gas generated after thermal runaway of the thermal runaway gas production device, so that convenience is provided for subsequent testing; the pressure release valve connector can be used for installing a pressure release valve, the anti-explosion valve connector can be used for installing an anti-explosion valve, and the safety coefficient of the closed pressure storage tank is improved. According to the invention, a large-volume closed space can be provided, and the influence on the measurement accuracy caused by the pollution of external environmental factors to thermal runaway gas production is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery testing equipment and peripheral supporting facilities thereof, and in particular to a closed pressure storage tank for collecting gas generated by thermal runaway of lithium ion batteries. Background Art

[0002] The promotion of new energy vehicles has the potential for wide application, which can reduce excessive carbon consumption and improve environmental quality. Compared with lead-acid batteries and nickel-metal hydride batteries, lithium-ion batteries are more suitable as the main power source of new energy vehicles due to their high energy density, long life and high reliability. And people's demand for the energy density and charging speed of lithium batteries is getting higher and higher. However, lithium-ion batteries are extremely sensitive to temperature during operation, resulting in poor thermal stability. Safety accidents caused by thermal runaway due to factors such as thermal abuse, mechanical abuse and electrochemical abuse occur frequently. After thermal runaway, lithium batteries release heat and emit a large amount of toxic gases and oxygen. Gases produced by chemical reactions of battery materials and evaporation of electrolytes include CO, CO2, fluoride, H2 and CH4. CO and CO2 are produced by oxidation and decomposition of the negative electrode, while H2 and O2 are produced by oxidation and decomposition of the positive electrode. These gases accumulate inside the lithium battery. When the threshold of the safety valve is reached, the internal gas is ejected from the safety valve. After meeting the fire triangle elements, the lithium battery will burn violently, seriously endangering people's lives. Therefore, it is urgent to find out the percentage of gas production in large-scale lithium batteries, which can guide people to design safer high-energy density lithium batteries. Due to different thermal triggering factors, the gas production content of lithium batteries is different, so it is necessary to design a closed pressure storage tank that can meet the thermal runaway of different triggering factors.

[0003] In the prior art of "battery thermal runaway exhaust device and battery system", an innovative battery thermal runaway exhaust device and its battery system are proposed. The device cleverly connects the head end of the pipe assembly to multiple battery packs, while the other end of the pipe is connected to the input end of the fan, and the output end of the fan directly leads to the discharge port of the storage room. This design allows any battery pack to encounter thermal runaway conditions. The harmful gases generated can be quickly sucked into the fan through the pipe assembly and efficiently discharged to the outdoor environment by the fan, thereby effectively avoiding direct contact between the staff and these harmful gases.

[0004] In the prior art of "a method for analyzing the influence of internal gas in a battery on thermal runaway and a sampling device for internal gas in a battery", an innovative method and a matching detection device for analyzing how internal gas in a battery affects the thermal runaway process are proposed. The core steps of this method cover the thermal runaway tests on two groups of batteries to be tested (i.e., the first battery to be tested and the second battery to be tested). During the test, two key preset values ​​are first set: the first preset value is used as a sign that the battery begins to generate significant heat (based on the temperature or voltage change); the second preset value is defined as the critical condition for triggering thermal runaway of the battery (also based on the temperature or voltage change). This method can analyze the impact of internal gas disturbance in the battery on thermal runaway.

[0005] In the prior art of "battery thermal runaway test device and battery thermal runaway test method", a battery thermal runaway test device with excellent comprehensive performance and its supporting test method are provided. The test device is composed of several well-designed components, including a gas source component, a thermal runaway generating component, a gas detection component and a core controller. The thermal runaway generating component is the core part, which is built into the first shell. At least one high-efficiency thermal runaway generator is configured inside the shell to accurately simulate and trigger the thermal runaway process of the battery. In addition, the exhaust component is cleverly integrated in the first shell to ensure that the gas generated after thermal runaway can be discharged in an orderly and safe manner. The second shell is equipped with multiple precision gas sensors, which can fully capture and analyze various gas components released during the thermal runaway process. This design realizes comprehensive and high-precision detection of gases and particulate matter during the thermal runaway process of the battery, which not only improves the comprehensiveness of the test, but also significantly enhances the accuracy of the test results, providing strong technical support for the research and evaluation of battery safety performance.

[0006] Existing devices for measuring the gas production content of lithium batteries during thermal runaway are focused on measuring the sealed tanks of small batteries. There is no clear device for measuring the gas production of large-sized batteries with high specific energy. After a square battery triggers thermal runaway, its gas production will change dynamically with time, temperature, state of charge and other factors, which increases the difficulty of measurement. External environmental factors (such as temperature, humidity, air pressure, etc.) may interfere with the measurement results and affect the accuracy of the measurement. The tanks in the prior art can only test the thermal behavior of batteries with a single triggering method. Summary of the invention

[0007] The purpose of the present invention is to provide a closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries, so as to solve the problems existing in the above-mentioned related technologies. The gas generated by thermal runaway of lithium-ion batteries can be accurately collected to facilitate subsequent measurement, while avoiding contamination of the gas generated by thermal runaway by the external environment, thereby ensuring measurement accuracy.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery, comprising:

[0010] A tank body, the inner cavity of which can accommodate a thermal runaway gas generating device;

[0011] A gland, wherein the gland is detachably connected to the tank body, and when the gland is connected to the tank body, the two enclose a closed test space; a gas collection interface is provided on the gland, and the gas collection interface can be communicated with an external gas collection element; the gland is also provided with a sensor interface, a pressure relief valve interface, an explosion-proof valve interface and a line plug interface, the sensor interface is used to install a pressure sensor, the pressure relief valve interface is used to install a pressure relief valve, the explosion-proof valve interface is used to install an explosion-proof valve, and the line plug interface can be connected to an external line, so that the thermal runaway gas production device can perform a thermal runaway test;

[0012] The tank body and the gland are both provided with transparent observation windows.

[0013] Preferably, the tank body is connected to a tank mouth flange, the shape of the tank mouth flange is consistent with the shape of the gland, and when the tank body is sealed and connected with the gland, the gland is pressed against the end face of the tank mouth flange, and a sealing element is arranged between the gland and the tank mouth flange.

[0014] Preferably, the gland is rotatably connected to the side wall of the tank body by a connecting bracket to realize opening and closing of the gland;

[0015] The connecting bracket includes a first connecting frame and a second connecting frame, the first connecting frame is connected to the pressure cover, the second connecting frame is an L-shaped structure, one end of the second connecting frame is connected to the side wall of the tank body, and the other end of the second connecting frame is rotatably connected to the first connecting frame.

[0016] Preferably, a sealing knob is provided between the gland and the tank mouth flange, and the sealing knob can fix the relative position of the gland and the tank mouth flange.

[0017] Preferably, the sealing knob comprises a transfer rod and a transfer joint, one end of the transfer rod is rotatably connected to the tank body, the axis of the transfer rod is perpendicular to the axis of the tank body, the other end of the transfer rod is connected to the transfer joint, the tank mouth flange and the gland have notches adapted to the transfer rod, the notches are U-shaped, the openings of the notches are located on the outer circumferences of the gland and the tank mouth flange, the transfer rod can enter the notches by rotation, the transfer joint clamps the gland so that the gland is pressed against the tank mouth flange, thereby achieving a sealed connection between the gland and the tank body;

[0018] The number of the sealing knobs is multiple groups, and the sealing knobs are evenly distributed around the axis of the tank body.

[0019] Preferably, the gland is also provided with a handle and a cleaning interface, and the cleaning interface is used to communicate with an external cleaning medium.

[0020] Preferably, a carrier plate is provided in the tank body, and the carrier plate can support the thermal runaway gas generating device.

[0021] Preferably, the carrier plate is detachably connected to the inner wall of the tank body, and the side wall of the tank body is provided with a plurality of mounting positions adapted to the carrier plate, and the number of the carrier plates is plural.

[0022] Preferably, the closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries further comprises a base, which is arranged at the bottom of the tank body and connected to the side wall of the tank body.

[0023] Preferably, the base is a frame structure.

[0024] Compared with the related art, the present invention has achieved the following technical effects: the closed pressure storage tank for collecting thermal runaway gas production of lithium-ion batteries of the present invention comprises a tank body and a gland, wherein the inner cavity of the tank body can accommodate a thermal runaway gas production device; the gland is detachably connected to the tank body, and when the gland is connected to the tank body, the two form a closed test space; a gas collection interface is provided on the gland, and the gas collection interface can be connected to an external gas collection element; the gland is also provided with a sensor interface, a pressure relief valve interface, an explosion-proof valve interface and a line plug interface, the sensor interface is used to install a pressure sensor, the pressure relief valve interface is used to install a pressure relief valve, the explosion-proof valve interface is used to install an explosion-proof valve, and the line plug interface can be connected to an external line, so that the thermal runaway gas production device can perform a thermal runaway test; both the tank body and the gland are provided with transparent observation windows.

[0025] The closed pressure storage tank for collecting thermal runaway gas produced by lithium-ion batteries of the present invention can accommodate a thermal runaway gas producing device, such as a lithium-ion battery, an electric push rod, etc. in the tank body. After the thermal runaway gas producing device is placed, the gland is sealed and connected to the tank body. In order to ensure that the thermal runaway gas producing device can be connected to external equipment, a line plug interface is provided on the gland for connecting power lines, signal lines, heating lines, and thermocouple lines inside and outside the tank body. When testing, the runaway process of the thermal runaway gas producing device can be observed through the observation windows on the tank body and the gland. The pressure sensor is connected by the sensor interface to monitor the pressure inside the tank body, and the gas collection element is connected to the gas collection interface to collect the gas generated after the thermal runaway gas producing device goes into thermal runaway, which provides convenience for subsequent testing. The pressure relief valve interface can be used to install the pressure relief valve, and the explosion-proof valve interface can be used to install the explosion-proof valve, thereby improving the safety factor of the closed pressure storage tank. The closed pressure storage tank for collecting the gas produced by thermal runaway of lithium-ion batteries of the present invention can provide a large volume of closed space, avoiding the contamination of the gas produced by thermal runaway by external environmental factors (such as temperature, humidity, air pressure, etc.), thereby affecting the accuracy of measurement; with the help of the closed pressure storage tank of the present invention, the gas produced by thermal runaway of high-specific energy and large-size lithium batteries can be accurately collected, which is convenient for subsequent accurate measurement of gas production, which helps researchers understand the gas production characteristics of thermal runaway of lithium batteries under different conditions and provides data support for battery design optimization. In addition, the collected gas can be analyzed by advanced instruments such as gas chromatography (GC) and mass spectrometry (MS) to determine the specific gas components and their proportions produced during the thermal runaway process, which helps to reveal the chemical reaction mechanism of thermal runaway of lithium batteries and provide a scientific basis for formulating effective preventive measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery disclosed in an embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery disclosed in an embodiment of the present invention when it is opened;

[0029] Figure 3 This is a schematic structural diagram of a tank body of a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery disclosed in an embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of a gland for a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery disclosed in an embodiment of the present invention;

[0031] Figure 5 This is a schematic structural diagram of a base of a closed pressure storage tank for collecting gas generated by thermal runaway of a lithium-ion battery disclosed in an embodiment of the present invention.

[0032] In the figure: 1. tank body; 2. gland; 3. gas collection interface; 4. sensor interface; 5. pressure relief valve interface; 6. explosion-proof valve interface; 7. line plug interface; 8. observation window; 9. tank mouth flange; 10. connecting bracket; 11. first connecting frame; 12. second connecting frame; 13. sealing knob; 14. adapter rod; 15. adapter; 16. handle; 17. cleaning interface; 18. loading plate; 19. base. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries, so as to solve the problems existing in the above-mentioned related technologies. The gas generated by thermal runaway of lithium-ion batteries can be accurately collected to facilitate subsequent measurement, while avoiding contamination of the gas generated by thermal runaway by the external environment, thereby ensuring measurement accuracy.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] This embodiment provides a closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries. Figure 1-Figure 5, comprising a tank body 1 and a gland 2, wherein the inner cavity of the tank body 1 can accommodate a thermal runaway gas generating device; the gland 2 and the tank body 1 can be detachably connected, and when the gland 2 and the tank body 1 are connected, the two form a closed test space; a gas collection interface 3 is provided on the gland 2, and the gas collection interface 3 can be connected to an external gas collection element; the gland 2 is also provided with a sensor interface 4, a pressure relief valve interface 5, an explosion-proof valve interface 6 and a line plug interface 7, the sensor interface 4 is used to install a pressure sensor, the pressure relief valve interface 5 is used to install a pressure relief valve, the explosion-proof valve interface 6 is used to install an explosion-proof valve, and the line plug interface 7 can be connected to an external line, so that the thermal runaway gas generating device can perform a thermal runaway test; both the tank body 1 and the gland 2 have a transparent observation window 8.

[0038] The closed pressure storage tank for collecting thermal runaway gas generation of lithium ion batteries of the present invention can accommodate a thermal runaway gas generation device in the tank body 1, such as a lithium ion battery, an electric push rod, etc. After the thermal runaway gas generation device is placed, the gland 2 is sealed and connected to the tank body 1. In order to ensure that the thermal runaway gas generation device can be connected to external equipment, a line plug interface 7 is provided on the gland 2 for connecting power supply lines, signal lines, heating lines, and thermocouple lines inside and outside the tank body 1. When testing, the runaway process of the thermal runaway gas generation device can be observed through the observation window 8 on the tank body 1 and the gland 2. The observation window 8 can be made of explosion-proof glass. The pressure sensor is connected by the sensor interface 4 to monitor the pressure in the tank body 1. The gas collection element is connected to the gas collection interface 3 to collect the gas generated after the thermal runaway gas generation device is in thermal runaway, which provides convenience for subsequent testing. The pressure relief valve interface 5 can be used to install the pressure relief valve to discharge the exhaust gas in the tank. The explosion-proof valve interface 6 can be used to install the explosion-proof valve, which improves the safety factor of the closed pressure storage tank. The closed pressure storage tank for collecting the gas produced by thermal runaway of lithium-ion batteries of the present invention can provide a large volume of closed space, avoiding the contamination of the gas produced by thermal runaway by external environmental factors (such as temperature, humidity, air pressure, etc.), thereby affecting the accuracy of measurement; with the help of the closed pressure storage tank of the present invention, the gas produced by thermal runaway of high-specific energy and large-size lithium batteries can be accurately collected, which is convenient for subsequent accurate measurement of gas production, which helps researchers understand the gas production characteristics of thermal runaway of lithium batteries under different conditions and provides data support for battery design optimization. In addition, the collected gas can be analyzed by advanced instruments such as gas chromatography (GC) and mass spectrometry (MS) to determine the specific gas components and their proportions produced during the thermal runaway process, which helps to reveal the chemical reaction mechanism of thermal runaway of lithium batteries and provide a scientific basis for formulating effective preventive measures.

[0039] It should also be noted that the volume of the closed pressure storage tank of the present invention is about 0.06m 3, the design pressure is 0.8MPa. The explosion-proof valve interface 6 is connected to the explosion-proof valve, and the explosion-proof pressure is set to 0.6MPa to ensure the safety of the experimenters. In addition, in this specific embodiment, the gas collection element adopts a gas collection bag to collect gas samples. The line plug interface 7 adopts an aviation plug interface, each interface has four threaded holes for fixing the aviation plug, and the first interface does not penetrate, connecting the power supply lines inside and outside the tank body 1, and the second and third interfaces penetrate, connecting the signal lines, heating lines and K-type thermocouple lines inside and outside the tank body 1, so as to realize operation outside the tank body 1 and control the thermal behavior of the lithium battery inside the tank body 1. In practical applications, other types of plug interfaces can also be selected.

[0040] In order to facilitate connection, the tank body 1 is connected to a tank mouth flange 9, and the shape of the tank mouth flange 9 is consistent with the shape of the pressure cover 2. When the tank body 1 is sealed and connected with the pressure cover 2, the pressure cover 2 is pressed against the end face of the tank mouth flange 9, and a sealing element is arranged between the pressure cover 2 and the tank mouth flange 9 to ensure the sealing of the cavity enclosed by the tank body 1 and the pressure cover 2, thereby ensuring the subsequent accurate measurement of thermal runaway gas production.

[0041] Among them, the gland 2 is rotatably connected to the side wall of the tank body 1 by means of a connecting bracket 10 to realize the opening and closing of the gland 2. The gland 2 is opened, and the thermal runaway gas production device is placed into the inner cavity of the tank body 1. The gland 2 is closed to make the gland 2 and the tank body 1 sealed, thereby providing protection for the subsequent thermal runaway gas collection.

[0042] In this specific embodiment, the connecting bracket 10 includes a first connecting frame 11 and a second connecting frame 12. The first connecting frame 11 is connected to the pressure cover 2, and the second connecting frame 12 is an L-shaped structure. One end of the second connecting frame 12 is connected to the side wall of the tank body 1, and the other end of the second connecting frame 12 is rotatably connected to the first connecting frame 11. The rotation axis of the first connecting frame 11 and the second connecting frame 12 is perpendicular to the axis of the tank body 1. The pressure cover 2 is flipped so that the first connecting frame 11 rotates relative to the second connecting frame 12, which can realize the opening and closing of the pressure cover 2, thereby improving the operating convenience of the closed pressure storage tank.

[0043] During the process of collecting thermal runaway gases, in order to avoid misalignment of the gland 2 and ensure the structural stability of the closed pressure storage tank, a sealing knob 13 is arranged between the gland 2 and the tank mouth flange 9. The sealing knob 13 can fix the relative position of the gland 2 and the tank mouth flange 9. After the gland 2 is closed in place, the sealing knob 13 is used to lock the gland 2 so that the gland 2 is pressed against the end face of the tank mouth flange 9, thereby ensuring the sealing of the cavity enclosed by the tank body 1 and the gland 2 and improving the reliability of collecting thermal runaway gases.

[0044] Specifically, the sealing knob 13 includes a transfer rod 14 and an adapter 15, one end of the transfer rod 14 is rotatably connected to the tank body 1, the axis of the transfer rod 14 is perpendicular to the axis of the tank body 1, and the other end of the transfer rod 14 is connected to the adapter 15. The tank mouth flange 9 and the pressure cover 2 both have a notch adapted to the transfer rod 14, the notch is U-shaped, and the opening of the notch is located on the outer circumference of the pressure cover 2 and the tank mouth flange 9. The transfer rod 14 can be rotated to enter the notch, and the adapter 15 clamps the pressure cover 2 so that the pressure cover 2 is pressed on the tank mouth flange 9 to achieve a sealed connection between the pressure cover 2 and the tank body 1; after closing the pressure cover 2, the transfer rod 14 is rotated, and the transfer rod 14 enters the notch of the pressure cover 2 and the tank mouth flange 9. At the same time, the adapter 15 cannot pass through the notch and is clamped at the notch of the pressure cover 2, thereby locking the pressure cover 2 and ensuring the closing reliability of the closed pressure storage tank.

[0045] In order to improve the force uniformity of the gland 2 and the tank body 1, the number of sealing knobs 13 is multiple groups, and the sealing knobs 13 are evenly distributed around the axis of the tank body 1, while ensuring the sealing of the closed pressure storage tank.

[0046] For the convenience of operation, the gland 2 is also provided with a handle 16 and a cleaning interface 17. The operator can use the handle 16 to operate the gland 2 to open and close the gland 2; the cleaning interface 17 is used to communicate with the external cleaning medium, and the cleaning medium is transported into the tank body 1 by using the cleaning interface 17, so as to facilitate the cleaning and maintenance of the tank body 1 and provide convenience for the subsequent collection of thermal runaway gases. In practical applications, a suitable cleaning medium can be selected according to specific needs, for example, argon gas can be selected as the cleaning medium to clean the air and residual exhaust gas inside the tank body 1.

[0047] In order to place and position the thermal runaway gas producing device, a carrier plate 18 is provided in the tank body 1. The carrier plate 18 can support the thermal runaway gas producing device, so that the closed pressure storage tank can adapt to various types and specifications of thermal runaway gas producing devices.

[0048] In other specific embodiments that can be realized by the present invention, the carrier plate 18 is detachably connected to the inner wall of the tank body 1, and whether to set the carrier plate 18 and adjust the installation position of the carrier plate 18 can be determined according to actual needs. The side wall of the tank body 1 has multiple groups of installation positions compatible with the carrier plate 18. The number of carrier plates 18 is multiple, and multiple carrier plates 18 of different specifications can be set. According to different working conditions, the appropriate number and specifications of carrier plates 18 are selected to improve the flexibility and adaptability of the carrier plate 18.

[0049] More specifically, the closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries of the present invention also includes a base 19, which is arranged at the bottom of the tank body 1 and connected to the side wall of the tank body 1 to provide stable support for the tank body 1.

[0050] In practical applications, the base 19 can be set as a frame structure, which can reduce the difficulty of manufacturing the base 19 while supporting the tank body 1, thereby saving production costs.

[0051] It should also be noted here that, in actual application, the tank body 1, the pressure cover 2, the handle 16, the connecting bracket 10, the sealing knob 13, the loading plate 18 and the base 19 can all be made of stainless steel to further enhance the structural strength of the closed pressure storage tank and meet the requirements of the pressure working environment.

[0052] Embodiment 2

[0053] This embodiment provides a thermal runaway gas detection system, including the closed pressure storage tank for collecting thermal runaway gas of a lithium-ion battery according to the first embodiment, and also including a gas detection device.

[0054] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries, characterized in that: include: A tank body, the inner cavity of which can accommodate a thermal runaway gas generating device; A gland, wherein the gland is detachably connected to the tank body, and when the gland is connected to the tank body, the two enclose a closed test space; a gas collection interface is provided on the gland, and the gas collection interface can be communicated with an external gas collection element; the gland is also provided with a sensor interface, a pressure relief valve interface, an explosion-proof valve interface and a line plug interface, the sensor interface is used to install a pressure sensor, the pressure relief valve interface is used to install a pressure relief valve, the explosion-proof valve interface is used to install an explosion-proof valve, and the line plug interface can be connected to an external line, so that the thermal runaway gas production device can perform a thermal runaway test; The tank body and the gland are both provided with transparent observation windows.

2. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 1, characterized in that: The tank body is connected with a tank mouth flange, the shape of which is consistent with the shape of the gland. When the tank body is sealed with the gland, the gland is pressed against the end face of the tank mouth flange, and a sealing element is provided between the gland and the tank mouth flange.

3. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 2, characterized in that: The gland is rotatably connected to the side wall of the tank body by a connecting bracket to realize opening and closing of the gland; The connecting bracket includes a first connecting frame and a second connecting frame, the first connecting frame is connected to the pressure cover, the second connecting frame is an L-shaped structure, one end of the second connecting frame is connected to the side wall of the tank body, and the other end of the second connecting frame is rotatably connected to the first connecting frame.

4. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 2, characterized in that: A sealing knob is arranged between the gland and the tank mouth flange, and the sealing knob can fix the relative position of the gland and the tank mouth flange.

5. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 4, characterized in that: The sealing knob comprises a transfer rod and a transfer joint, one end of the transfer rod is rotatably connected to the tank body, the axis of the transfer rod is perpendicular to the axis of the tank body, the other end of the transfer rod is connected to the transfer joint, the tank mouth flange and the gland have notches adapted to the transfer rod, the notches are U-shaped, the openings of the notches are located on the outer circumferences of the gland and the tank mouth flange, the transfer rod can enter the notches by rotation, the transfer joint clamps the gland so that the gland is pressed against the tank mouth flange, thereby achieving a sealed connection between the gland and the tank body; The number of the sealing knobs is multiple groups, and the sealing knobs are evenly distributed around the axis of the tank body.

6. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 1, characterized in that: The gland is also provided with a handle and a cleaning interface, and the cleaning interface is used to communicate with an external cleaning medium.

7. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to any one of claims 1 to 6, characterized in that: A carrier plate is arranged in the tank body, and the carrier plate can support the thermal runaway gas generating device.

8. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 7, characterized in that: The carrier plate is detachably connected to the inner wall of the tank body, and the side wall of the tank body is provided with a plurality of mounting positions matched with the carrier plate, and the number of the carrier plates is multiple.

9. The closed pressure storage tank for collecting thermal runaway gas of lithium-ion batteries according to any one of claims 1 to 6, characterized in that: The tank body also includes a base, which is disposed at the bottom of the tank body and connected to the side wall of the tank body.

10. The closed pressure storage tank for collecting gas generated by thermal runaway of lithium-ion batteries according to claim 9, characterized in that: The base is a frame structure.

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