Thermal runaway flue gas treatment device

Abstract

The utility model provides a thermal runaway flue gas treatment device which mainly solves the problem that potential safety hazards exist after thermal runaway flue gas is exhausted. The thermal runaway flue gas treatment device comprises a buffer device and an adsorption treatment device, the buffer device comprises M buffer tanks; and the adsorption treatment device is connected with the smoke outlet of the Mth buffer tank and is used for treating the thermal runaway smoke. The buffer tank can collect part of electrolyte in the thermal runaway flue gas and buffer the thermal runaway flue gas, so that the thermal runaway flue gas enters the adsorption treatment device at a relatively stable flow rate, and further the thermal runaway flue gas is fully treated by the adsorption treatment device.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to a thermal runaway flue gas treatment device. Background Art

[0002] With the widespread application of lithium-ion batteries, the safe use of lithium-ion batteries has also attracted attention. Under the influence of factors such as overcharge, overdischarge, overheating, and mechanical collision, lithium-ion batteries are prone to battery diaphragm collapse and internal short circuit, leading to thermal runaway.

[0003] When a lithium-ion battery is in complete thermal runaway, the internal temperature of the battery is as high as 500-1000°C. The gas generated during the thermal runaway process causes the internal pressure of the battery to increase, causing the battery shell to expand and rupture, and eventually the explosion venting membrane opens, spraying and releasing the evaporated electrolyte and reaction gas inside the battery, forming pressurized thermal runaway flue gas. The thermal runaway flue gas includes combustibles such as electrolyte, hydrogen, carbon monoxide, methane, and ethylene, and combustibles account for a large proportion of the thermal runaway flue gas. When the thermal runaway flue gas is discharged, the combustibles come into contact with the air and are prone to combustion. In severe cases, they can cause explosions, posing safety hazards. Summary of the invention

[0004] In order to solve the potential safety hazard problem after the thermal runaway flue gas is discharged, the utility model provides a thermal runaway flue gas treatment device.

[0005] In order to achieve the above object, the technical solution of the utility model is:

[0006] A thermal runaway flue gas treatment device comprises a buffer device and an adsorption treatment device; the buffer device comprises M buffer tanks, each buffer tank being provided with a smoke inlet and a smoke outlet connected to its inner cavity, wherein M is an integer greater than or equal to 1; the adsorption treatment device is connected to the smoke outlet of the Mth buffer tank, and is used for treating the thermal runaway flue gas.

[0007] Furthermore, the adsorption treatment device includes a liquid adsorption treatment device, which includes N liquid treatment tanks, each of which is provided with a smoke inlet and a smoke outlet connected to its inner cavity, and the smoke inlet of the first liquid treatment tank is connected to the smoke outlet of the Mth buffer tank, wherein N is an integer greater than or equal to 1; the liquid treatment tank is filled with a liquid treatment medium.

[0008] Furthermore, the adsorption treatment device includes a solid adsorption treatment device, which includes a plurality of solid treatment tanks, each of which is provided with a flue gas inlet and a flue gas outlet connected to its inner cavity, and the flue gas inlet of the first solid treatment tank is connected to the smoke outlet of the Mth buffer tank; the solid treatment tank is filled with a solid adsorption medium.

[0009] Furthermore, the adsorption treatment device includes a liquid adsorption treatment device and a solid adsorption treatment device, the liquid adsorption treatment device includes at least one liquid treatment tank, and the liquid treatment tank is filled with a liquid treatment medium; the solid adsorption treatment device includes at least one solid treatment tank, and the solid treatment tank is filled with a solid adsorption medium, the flue gas inlet of the first liquid treatment tank is connected to the smoke outlet of the Mth buffer tank, and the smoke outlet of the Nth liquid treatment tank is connected to the smoke inlet of the first solid treatment tank.

[0010] Furthermore, it also includes an ignition device, which is mainly used to ignite the residual thermal runaway flue gas discharged from the adsorption treatment device.

[0011] Furthermore, it also includes a flue gas cooling device; the flue gas cooling device is arranged between the buffer device and the adsorption treatment device, and is mainly used for cooling the thermal runaway flue gas.

[0012] Furthermore, the liquid treatment medium is an alkaline solution.

[0013] Furthermore, the alkaline solution is a 0.05-0.5 mol / L NaOH solution.

[0014] Furthermore, the smoke inlet and the smoke outlet are both arranged at the top of the liquid treatment tank, and the smoke inlet is connected to a smoke inlet pipe, at least a portion of the smoke inlet pipe can be immersed in the liquid treatment medium, and a diversion part is provided at the end of the smoke inlet pipe immersed in the liquid treatment medium, and a spiral baffle is provided on the smoke inlet pipe or a plurality of deflectors are provided on the smoke inlet pipe to increase the distance traveled by the thermal runaway flue gas in the liquid treatment tank.

[0015] Furthermore, a three-way valve is provided on the smoke outlet of the liquid treatment tank, a first port of the three-way valve is connected to the inner cavity of the liquid treatment tank, a second port is used to discharge the thermal runaway smoke, and a third port is used to inject the liquid treatment medium.

[0016] Furthermore, the smoke inlet and the smoke outlet of the buffer tank are both arranged on the top of the buffer tank.

[0017] Furthermore, a drain valve is provided at the bottom of the buffer tank.

[0018] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0019] 1. The thermal runaway flue gas treatment device of the utility model includes a buffer device and an adsorption treatment device. The buffer device includes M buffer tanks. The buffer tank not only buffers the thermal runaway flue gas, but also allows the thermal runaway flue gas to enter the adsorption treatment device at a relatively stable flow rate, so that the thermal runaway flue gas is fully treated by the adsorption treatment device. At the same time, the buffer tank can collect part of the electrolyte carried in the thermal runaway flue gas to reduce the usage of the subsequent adsorption treatment device.

[0020] 2. In the thermal runaway flue gas treatment device of the utility model, the adsorption treatment device includes a liquid adsorption treatment device, which is mainly used to treat the electrolyte in the thermal runaway flue gas to prevent the vaporized electrolyte from continuing to decompose and produce combustible gas, reduce the amount of combustible gas, and solve the potential safety hazard problem after the thermal runaway flue gas is discharged.

[0021] 3. In the thermal runaway flue gas treatment device of the utility model, the adsorption treatment device includes a liquid adsorption treatment device and a solid adsorption treatment device which are arranged in sequence. This combination method can treat the thermal runaway flue gas more fully. The treated gas is non-flammable and harmless and can be discharged directly.

[0022] 4. In the thermal runaway flue gas treatment device of the utility model, the liquid treatment medium is an alkaline solution, which can not only fully treat the electrolyte carried in the thermal runaway flue gas to prevent the vaporized electrolyte from continuing to decompose and produce combustible gas, but also treat part of the gas in the thermal runaway flue gas. The gas volume of the thermal runaway flue gas treated with the alkaline solution is greatly reduced. Among them, the treatment effect of 0.05-0.5 mol / L NaOH solution on thermal runaway flue gas is more prominent.

[0023] 5. In the thermal runaway flue gas treatment device of the utility model, a three-way valve is provided on the flue gas outlet of the liquid treatment tank. The three-way valve can be used to fill the liquid treatment medium after the air tightness test of the liquid treatment tank is completed. There is no need to conduct a secondary air tightness test on the liquid treatment tank, thereby improving the assembly efficiency of the liquid adsorption treatment device.

[0024] 6. In the thermal runaway flue gas treatment device of the utility model, the flue gas inlet and the flue gas outlet on the liquid treatment tank are both arranged at the top of the liquid treatment tank, which improves the connectivity of the entire device and the compactness of the pipeline layout. At the same time, a smoke inlet pipeline is arranged in the liquid treatment tank, and at least part of the smoke inlet pipeline can be immersed in the liquid treatment medium, so that the thermal runaway flue gas can fully contact with the liquid treatment medium. At the same time, a diversion part is arranged at one end of the smoke inlet pipeline immersed in the liquid treatment medium. When the thermal runaway flue gas passes through the liquid treatment tank, the diversion part breaks up and diverts the thermal runaway flue gas and then reacts with the liquid treatment medium in the liquid treatment tank, so that the thermal runaway flue gas and the liquid treatment medium are more fully contacted and reacted, which improves the treatment effect of the liquid treatment medium and the treatment of the thermal runaway flue gas is more thorough.

[0025] 7. In the thermal runaway flue gas treatment device of the utility model, a spiral baffle or multiple baffles are arranged on the smoke inlet pipe. When the thermal runaway flue gas passes through the liquid treatment tank, the spiral baffle or multiple baffles increase the stroke of the thermal runaway flue gas, so that the thermal runaway flue gas can more fully contact and react with the liquid treatment medium, further improving the treatment effect of the liquid treatment medium.

[0026] 8. In the thermal runaway flue gas treatment device of the utility model, the smoke inlet of the buffer tank is arranged at the top of the buffer tank. Firstly, the solid impurities and electrolyte carried by the thermal runaway flue gas can be deposited at the bottom of the buffer tank as much as possible under the action of gravity. Secondly, it is difficult for the liquid in the buffer tank to be squeezed into the flue gas conveying pipe in front through the smoke inlet. At the same time, the smoke outlet of the buffer tank is arranged at the top of the buffer tank. Firstly, the solid impurities and electrolyte carried by the thermal runaway flue gas cannot be discharged from the buffer tank. Secondly, the gas in the thermal runaway flue gas can be discharged smoothly and quickly.

[0027] 9. In the thermal runaway flue gas treatment device of the utility model, a drain valve is provided at the bottom of the buffer tank, and the drain valve can discharge the liquid in the buffer tank in time.

[0028] 10. The thermal runaway flue gas treatment device of the utility model also includes a flue gas cooling device, which is mainly used to cool the thermal runaway flue gas. This treatment method combined with the adsorption treatment device can fully treat the thermal runaway flue gas and reduce the hazards of thermal runaway flue gas discharge.

[0029] 11. In the thermal runaway flue gas treatment device of the utility model, the ignition device mainly ignites the residual thermal runaway flue gas to reduce the harm caused by the discharge of thermal runaway flue gas.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the thermal runaway flue gas treatment device in Example 1;

[0033] Figure 2 is a cross-sectional view of the liquid treatment tank in Example 1;

[0034] Figure 3 is a cross-sectional view of the liquid treatment tank (including the spiral baffle) in Example 1;

[0035] Figure 4 is a cross-sectional view of the liquid treatment tank (including baffles) in Example 1;

[0036] Figure 5 It is a schematic structural diagram of the thermal runaway flue gas treatment device in Example 2;

[0037] Figure 6 It is a schematic diagram of the structure of the thermal runaway flue gas treatment device in Example 3;

[0038] Figure 7 It is a schematic structural diagram of the thermal runaway flue gas treatment device in Example 4;

[0039] Figure 8 This is a schematic diagram of the structure of the thermal runaway flue gas treatment device in Example 5.

[0040] Figure markings: 1-buffer device, 2-liquid adsorption treatment device, 3-solid adsorption treatment device, 4-flue gas cooling device, 5-ignition device, 11-buffer tank, 12-smoke inlet, 13-smoke outlet, 14-drain valve, 21-liquid treatment tank, 22-smoke inlet, 23-smoke outlet, 24-three-way valve, 25-smoke inlet pipeline, 26-diversion part, 27-spiral baffle, 28-baffle, 29-connecting pipeline, 31-solid treatment tank, 41-cooling treatment tank, 51-smoke pipeline, 52-smoke exhaust pipe, 53-igniter, 54-trigger, 55-flame arrester. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0042] The "other embodiments" that appear in different places in this specification do not all refer to the same embodiment, nor are they separate or selective embodiments that are mutually exclusive with other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited.

[0043] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0044] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Research shows that when a lithium-ion battery experiences thermal runaway, a series of chemical reactions will occur inside, releasing a large amount of heat and gas, such as: SEI film decomposition reaction (90-120°C), cathode and electrolyte reaction (100-350°C), electrolyte decomposition reaction (110-300°C), diaphragm shrinkage and melting reaction (>130°C), cathode and electrolyte reaction (200-300°C), and binder decomposition reaction (200-300°C), etc. The above reactions do not occur in a fixed order, nor do they proceed independently.

[0046] The thermal runaway flue gas discharged during thermal runaway of lithium-ion batteries mainly includes the following components: vaporized electrolyte, CO2, CO, H2, C x H y , C x H y Oz , C x H y F, POF3 and HF, etc. The thermal runaway flue gas contains not only hydrogen, CO, CO2, methane and other gases, but also a large amount of electrolyte vapor. The vaporized electrolyte will not only react with the positive or negative electrode in the battery cavity, but also undergo a series of decomposition reactions, thereby continuing to produce a large amount of harmful gases and flammable gases.

[0047] The utility model provides a thermal runaway flue gas treatment device, which is connected to a flue gas delivery pipe. The thermal runaway flue gas generated when a lithium-ion battery is in thermal runaway is delivered to the thermal runaway flue gas treatment device through the flue gas delivery pipe. The thermal runaway flue gas treatment device includes a buffer device and an adsorption treatment device. The buffer device is arranged at the front end of the adsorption treatment device, and is used to perform buffering treatment on the thermal runaway flue gas, so that the thermal runaway flue gas enters the adsorption treatment device at a relatively stable flow rate for treatment. The above-mentioned adsorption treatment device mainly treats the electrolyte or combustible gas in the thermal runaway flue gas, so as to prevent the vaporized electrolyte from continuing to undergo a decomposition reaction to produce combustible gas, reduce the amount of combustible gas, and solve the potential safety hazard problem after the thermal runaway flue gas is discharged.

[0048] Example 1

[0049] like Figure 1 As shown, the thermal runaway flue gas treatment device in this embodiment includes a buffer device 1 and an adsorption treatment device. The buffer device 1 includes M buffer tanks 11, each of which is provided with a smoke inlet 12 and a smoke outlet 13 connected to its inner cavity; the adsorption treatment device in this embodiment includes a liquid adsorption treatment device 2; the liquid adsorption treatment device 2 includes N liquid treatment tanks 21, each of which is provided with a smoke inlet 22 and a smoke outlet 23 connected to its inner cavity, and the smoke inlet 22 of the first liquid treatment tank 21 is connected to the smoke outlet 13 of the Mth buffer tank 11, wherein M and N are both integers greater than or equal to 1; the above-mentioned buffer tank 11 is an empty tank body, which buffers the thermal runaway flue gas, and the liquid treatment tank 21 is filled with a liquid treatment medium for treating the thermal runaway flue gas. The structures of the buffer device 1 and the liquid adsorption treatment device 2 are described in detail below.

[0050] In the above buffer device 1, the number of buffer tanks 11 can be set according to the number and demand of lithium-ion batteries. If there are multiple buffer tanks 11, multiple buffer tanks 11 can be connected in series through connecting pipes. The shape of the buffer tank 11 is not limited, and can be a rectangular tank body, a round tank body, an elliptical tank body, etc. A round tank body is preferably used, which has good pressure-bearing performance.

[0051] The number of the buffer tank 11 in this embodiment is one. The buffer tank 11 is an empty tank body, and no substance is filled inside. It is arranged between the flue gas conveying pipe and the liquid adsorption treatment device 2, and mainly has the following functions:

[0052] First, buffer the heat loss flue gas;

[0053] A buffer tank 11 is arranged in front of the liquid adsorption treatment device 2. The buffer tank 11 buffers the thermal runaway flue gas, slows down the speed of the thermal runaway flue gas, and reduces the pressure of the thermal runaway flue gas, so that the thermal runaway flue gas enters the liquid treatment tank 21 at a relatively stable flow rate. The liquid treatment medium can perform relatively sufficient treatment on the thermal runaway flue gas, avoiding the defect that the thermal runaway flue gas with instantaneous high pressure quickly passes through the liquid treatment medium and the thermal runaway flue gas cannot be fully treated, thereby improving the treatment effect of the liquid treatment medium;

[0054] Second, collect the electrolyte in the thermal runaway flue gas;

[0055] Existing lithium-ion batteries generally contain free electrolyte, which is ejected together with the thermal runaway smoke when the lithium-ion battery is in thermal runaway. In particular, when the explosion relief zone is set at the bottom of the battery, almost all the free electrolyte in the battery is ejected together with the thermal runaway smoke. A buffer tank 11 is set in front of the liquid adsorption treatment device 2. The buffer tank 11 buffers the thermal runaway smoke and separates the thermal runaway smoke into gas and liquid, so that the electrolyte carried by the thermal runaway smoke is collected in the buffer tank 11, thereby reducing the amount of liquid treatment medium used in the subsequent liquid adsorption treatment device 2.

[0056] Third, remove impurities from the thermal runaway flue gas;

[0057] When a battery has thermal runaway, the temperature inside the battery is approximately between 140°C and 850°C. At this temperature, the diaphragm, plastic film, plastic parts and other easily fusible parts inside the battery are melted by high temperature. The above molten substances are ejected from the inner cavity of the battery along with the high-temperature and high-pressure thermal runaway flue gas. During the process of flowing through the flue gas conveying pipe to the thermal runaway flue gas treatment device at the rear, as the temperature of the thermal runaway flue gas decreases, the molten substances gradually solidify and agglomerate, which is easy to block the pipeline of the thermal runaway flue gas treatment device. At this time, after adding the above-mentioned buffer tank 11, impurities such as molten materials discharged from the thermal runaway flue gas will be deposited and collected in the buffer tank 11 when the thermal runaway flue gas is buffered in the buffer tank 11, thereby avoiding the problem of subsequent pipeline blockage;

[0058] Fourth, collect the backwashed liquid treatment medium;

[0059] When the battery has thermal runaway, the thermal runaway flue gas ejected instantly has a high pressure. The high-pressure thermal runaway flue gas enters the liquid treatment tank 21 through the flue gas delivery pipe. Since the liquid treatment tank 21 is filled with liquid treatment medium and is provided with a diversion part, the thermal runaway flue gas cannot be discharged from the liquid treatment tank 21 in time, and the liquid treatment tank 21 is pressurized. At this time, the following phenomena may occur: the liquid treatment medium in the liquid treatment tank 21 is backwashed into the flue gas delivery pipe by the high-pressure gas in the liquid treatment tank 21, and the flue gas delivery pipe is blocked, resulting in the thermal runaway flue gas subsequently generated by the battery being unable to be smoothly discharged into the liquid treatment tank 21 through the flue gas delivery pipe;

[0060] In this embodiment, a buffer tank 11 is added in front of the liquid treatment tank 21. When the liquid treatment medium in the liquid treatment tank 21 recoils, it is recoiled and collected in the front buffer tank 11 and does not flow into the flue gas conveying pipe, thereby avoiding the blockage problem of the flue gas conveying pipe, so that the thermal runaway flue gas can be smoothly discharged into the liquid adsorption treatment device 2 for treatment.

[0061] like Figure 1 As shown, the buffer tank 11 is provided with a smoke inlet 12 and a smoke outlet 13 which are connected to its inner cavity. The smoke inlet 12 is mainly used to be connected to an external smoke conveying pipe which conveys the thermal runaway smoke generated by the thermal runaway of the battery into the buffer tank 11. The smoke outlet 13 is mainly used to discharge the thermal runaway smoke in the buffer tank 11. The above-mentioned smoke inlet 12 and smoke outlet 13 can be set on the side wall of the buffer tank 11 or on the top of the buffer tank 11. In the present embodiment, the smoke inlet 12 and the smoke outlet 13 are both set on the top of the buffer tank 11. The smoke inlet 12 is set on the top of the buffer tank 11. Firstly, the solid impurities and electrolyte carried by the thermal runaway flue gas can be deposited at the bottom of the buffer tank 11 as much as possible under the action of gravity, and secondly, the liquid in the buffer tank 11 is difficult to be squeezed into the flue gas conveying pipe in front through the smoke inlet 12 at the top; the smoke outlet 13 is set on the top of the buffer tank 11. Firstly, the solid impurities and electrolyte carried by the thermal runaway flue gas cannot be discharged smoothly, and secondly, the gas in the thermal runaway flue gas can be discharged smoothly from the buffer tank 11.

[0062] In addition, a drain valve 14 may be provided at the bottom of the buffer tank 11 to discharge the liquid in the buffer tank 11 in time.

[0063] In the liquid adsorption treatment device 2 of this embodiment, the number of liquid treatment tanks 21 can be set according to the number and demand of lithium-ion batteries. If there are multiple liquid treatment tanks 21, the multiple liquid treatment tanks 21 can be connected in series through the connecting pipe 29, such as Figure 1 The shape of the liquid treatment tank 21 is not limited, and can be a rectangular tank body, a round tank body, an elliptical tank body, etc. A round tank body is preferably used, as the round tank body has good pressure bearing performance.

[0064] like Figure 1 and Figure 2 As shown, each liquid treatment tank 21 is provided with a smoke inlet 22 and a smoke outlet 23. The smoke inlet 22 is used to input the thermal runaway smoke into the liquid treatment tank 21, and the smoke outlet 23 is used to discharge the treated thermal runaway smoke. When the smoke inlet 22 and the smoke outlet 23 are specifically arranged, they can be arranged at the top of the liquid treatment tank 21, or they can be arranged on the side wall of the liquid treatment tank 21. In order to facilitate the connection of each liquid treatment tank 21, it is preferred that the smoke inlet 22 and the smoke outlet 23 are both arranged at the top of the liquid treatment tank 21. At this time, each liquid treatment tank 21 only needs to be connected at the top, which improves the connectivity of the entire thermal runaway smoke treatment device and the compactness of the pipeline layout. In addition, the above-mentioned connecting pipeline 29 can adopt a metal bellows. After the metal corrugated connection is adopted, each liquid treatment tank 21 can be arranged according to the requirements of the installation space, meet various installation requirements, and save installation space.

[0065] Before using the above-mentioned liquid treatment tank 21, it is generally necessary to carry out a corresponding airtight pressure leak test to ensure the sealing and reliability of the liquid treatment tank 21 during subsequent use. When the liquid treatment tank 21 is subjected to a pressure leak test, the first pressure leak test is generally carried out on an empty liquid treatment tank 21. After the first pressure leak test is completed, the liquid treatment tank 21 is filled with a liquid treatment medium, and then multiple liquid treatment tanks 21 are connected through a connecting pipe 29. After connecting multiple liquid treatment tanks 21, it is necessary to carry out a second pressure leak test on the connecting pipes 29 between the liquid treatment tanks 21. The two pressure leak tests make the detection efficiency of the liquid treatment tank 21 low, and further reduce the assembly efficiency of the liquid adsorption treatment device 2.

[0066] like Figure 2 and Figure 3 As shown, in order to facilitate the injection of liquid treatment medium and the pressure test and leak detection of the liquid treatment tank 21, a three-way valve 24 is provided on the above-mentioned flue gas outlet 23. The three-way valve 24 can specifically adopt a three-way ball valve or the like. The three-way valve 24 can be used to fill the liquid treatment medium after the pressure test and leak detection of all liquid treatment tanks 21 are completed. When specifically connected, the first port of the three-way valve 24 is connected to the flue gas outlet 23, the second port is used to discharge the thermal runaway flue gas, and the third port is used to inject the liquid treatment medium. In addition, in order to facilitate the standardization and integration of the entire thermal runaway flue gas treatment device, a three-way valve can also be installed on the smoke outlet 13 of the buffer tank 11, and the liquid treatment tank 21 and the buffer tank 11 can be pressure tested for leaks at the same time.

[0067] like Figure 2As shown, after the smoke inlet 22 is set at the top of the liquid treatment tank 21, in order to make the thermal runaway smoke fully contact with the liquid treatment medium in the liquid treatment tank 21, the smoke inlet 22 is connected with a smoke inlet pipeline 25, and at least part of the smoke inlet pipeline 25 can be immersed in the liquid treatment medium. Optimally, the smoke inlet pipeline 25 preferably extends to the bottom of the liquid treatment tank 21 and can be completely immersed in the liquid treatment medium. When the thermal runaway smoke passes through the liquid treatment tank 21, it fully contacts the liquid treatment medium in the liquid treatment tank 21, and the liquid treatment medium performs a relatively sufficient treatment on the thermal runaway smoke, thereby improving the treatment effect of the liquid treatment medium.

[0068] like Figure 2 As shown, a diversion portion 26 may also be provided at one end of the smoke inlet pipe 25 immersed in the liquid treatment medium. The diversion portion 26 disperses and diverts the thermal runaway flue gas before reacting with the liquid treatment medium in the liquid treatment tank 21, so that the thermal runaway flue gas enters in a large flow and exits in a small flow, which is beneficial to the dispersion of the thermal runaway flue gas, so that the thermal runaway flue gas and the liquid treatment medium are fully contacted and reacted, thereby improving the treatment effect of the liquid treatment medium. In the present embodiment, the diversion portion 26 is a foam copper column, which is easy to install and has a better dispersion and diversion effect. When the foam copper column is specifically installed, it is fixed to the port at one end of the smoke inlet pipe 25 immersed in the liquid treatment medium. Foam copper is a structure with a large number of three-dimensional holes in a copper matrix, which has a dispersing and buffering effect on the fluid. When in use, it is processed into a columnar structure, and the thermal runaway flue gas flows out from the foam copper column through the smoke inlet pipe 25, and then flows out through the side wall or bottom of the foam copper column to achieve the dispersion and buffering effect on the thermal runaway flue gas, so that the thermal runaway flue gas after diversion is fully in contact with the liquid treatment medium.

[0069] like Figure 3 and Figure 4 As shown, in order to further allow the thermal runaway flue gas to fully react with the liquid treatment medium, a spiral baffle 27 is provided on the above-mentioned smoke inlet pipe 25, or a plurality of baffles 28 are provided on the smoke inlet pipe 25. The spiral baffle 27 or a plurality of baffles 28 increase the travel of the thermal runaway flue gas when the thermal runaway flue gas passes through the liquid treatment tank 21, so that the thermal runaway flue gas can more fully contact with the liquid treatment medium. The thermal runaway flue gas enters from the flue gas inlet 22 of the liquid treatment tank 21, and then enters the bottom of the liquid treatment medium through the smoke inlet pipe 25, and then is broken up by the foam copper column. Then, during the process of rising from the bottom, the spiral baffle 27 or a plurality of baffles 28 will allow the thermal runaway flue gas to fully contact with the liquid treatment medium in the liquid treatment tank 21, so as to perform corresponding treatment. When specifically connected, the spiral baffle 27 can be fixed on the smoke inlet pipe 25. The baffles 28 are semicircular baffles, and a plurality of baffles 28 are arranged in sequence from bottom to top and are respectively fixed on the smoke inlet pipe 25 , and adjacent baffles 28 are installed in a staggered manner.

[0070] The liquid treatment tank 21 is filled with a liquid treatment medium, which is mainly used to fully treat the electrolyte carried in the thermal runaway flue gas to prevent the vaporized electrolyte from continuing to decompose and produce combustible gas, thereby reducing the content of combustibles (electrolyte and combustible gas) in the thermal runaway flue gas. The liquid treatment medium can specifically use the following substances:

[0071] First, the liquid treatment medium can be an organic solvent. According to the principle of like dissolves like, the organic solvent can fully treat the electrolyte carried in the thermal runaway flue gas, and at the same time can prevent the vaporized electrolyte from continuing to decompose. The organic solvent is specifically an ester solvent, an alcohol solvent or an aldehyde solvent. The ester solvent can specifically be diethyl phthalate solvent, methyl salicylate solvent, ethyl acetate solvent or butyl acetate solvent, etc. The alcohol solvent can specifically be benzyl alcohol solvent, isopentanol solvent, isobutanol solvent, isopropanol solvent, isooctyl alcohol solvent, n-propanol solvent or cyclohexanol solvent, etc. The aldehyde solvent is benzaldehyde solvent, heptaldehyde, phenylpropionaldehyde or methylnonaneacetaldehyde, etc.

[0072] Second, the liquid treatment medium is an alkaline solution, which can specifically be an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution, an aqueous barium hydroxide solution, etc. The alkaline solution can react with carbonate substances in the electrolyte to prevent the vaporized electrolyte from continuing to produce harmful gases and combustible gases, and treat the thermal runaway flue gas to a certain extent at the source. At the same time, the alkaline solution has a good treatment effect on acidic substances such as CO2, POF3 and HF, and can effectively treat some gases in the thermal runaway flue gas. In addition, the alkaline solution can cool the thermal runaway flue gas and fully dissolve the electrolyte vapor in the thermal runaway flue gas in the alkaline solution.

[0073] Among the above two liquid treatment media, the alkaline solution can not only treat the electrolyte in the thermal runaway flue gas, but also treat the gas in the thermal runaway flue gas. Therefore, the alkaline solution has a better treatment effect than the organic solvent.

[0074] For alkaline solutions, generally, the higher the concentration, the better the treatment effect on thermal runaway flue gas. However, the applicant found that low-concentration alkaline solutions have better treatment effects than high-concentration alkaline solutions, especially 0.05-0.5 mol / L alkaline solutions. When thermal runaway flue gas passes through an alkaline solution of this concentration, the amount of gas collected is minimal, and its treatment effect is better than that of alkaline solutions with a concentration of more than 0.5 mol / L. Therefore, the prejudice of the prior art is overcome, and a low-concentration alkaline solution is used to treat thermal runaway flue gas, so that the alkaline solution can achieve more effective treatment of thermal runaway flue gas.

[0075] Taking the alkaline solution as NaOH solution as an example, a large number of battery thermal runaway tests were carried out. After a horizontal comparison of the treatment effects of water and NaOH solutions of different concentrations on thermal runaway flue gas, it was found that the volume of gas collected after the thermal runaway flue gas was the smallest after being treated with 0.05-0.5 mol / L NaOH solution, the effect was significant after being treated with 0.1-0.2 mol / L NaOH solution, and the best effect was achieved after being treated with 0.1 mol / L NaOH solution.

[0076] Table 1 Unprocessed full-charge 32650 battery out-of-control data

[0077]

[0078] Table 2 Treatment results of different concentrations of NaOH solution

[0079]

[0080]

[0081] When the thermal runaway flue gas is transported to the NaOH solution, the NaOH solution reacts with the electrolyte, CO2, POF3 and acidic substances such as HF in the thermal runaway flue gas. For example, the ester in the electrolyte reacts with the NaOH solution: CHOOCR+NaOH=RCOONa+CHOH; CO2 reacts with the NaOH solution: 2NaOH+CO2=Na2CO3+H2O; CO2 will also react subsequently: Na2CO3+CO2+H2O=2NaHCO3; POF3 reacts with the NaOH solution: POF3+2NaOH=NaPF2O2+NaF+H2O; HF reacts with the NaOH solution: NaOH+HF=NaF+H2O. After the above reactions, the volume of the thermal runaway flue gas is greatly reduced.

[0082] According to the above test data, when the thermal runaway flue gas of the fully charged 32650 battery after thermal runaway is not treated in any way, the collected gas volume is 4L. When the thermal runaway flue gas of the fully charged 32650 battery after thermal runaway passes through a NaOH solution with a concentration of 0.5mol / L or more, the collected gas is generally greater than 2L, and the treatment effect is not ideal. After the thermal runaway flue gas of the fully charged 32650 battery after thermal runaway passes through a 0.05-0.5mol / L NaOH solution, the gas volume is small, all below 2L. After being treated with 0.1-0.2mol / L sodium hydroxide, the effect is significant. After being treated with 0.1mol / L sodium hydroxide, the collected gas volume is the smallest, only about 1L, and the effect is the best. Therefore, 0.05-0.5mol / L NaOH solution has a good treatment effect on the thermal runaway flue gas after battery thermal runaway.

[0083] When a battery experiences thermal runaway, the thermal runaway smoke generated by the thermal runaway of the battery is transported to the buffer device 1 through the smoke conveying pipe. The buffer device 1 performs buffering treatment on the thermal runaway smoke so that the thermal runaway smoke enters the liquid adsorption treatment device 2 at a relatively stable flow rate. The liquid adsorption treatment device 2 performs targeted treatment on the electrolyte and part of the gas carried in the thermal runaway smoke of the battery to prevent the vaporized electrolyte from continuing to decompose and react to produce gas, thereby reducing the amount of thermal runaway gas in the battery and improving the safety of the lithium-ion battery during use.

[0084] Example 2

[0085] This embodiment is similar to the embodiment 1, and is different from the embodiment 1 in that the adsorption treatment device in this embodiment includes a liquid adsorption treatment device 2 and a solid adsorption treatment device 3. Figure 5 As shown. From the test results in Example 1, it can be seen that a certain concentration of alkaline solution can effectively treat the thermal runaway flue gas, and the volume of the thermal runaway flue gas is greatly reduced. On this basis, the solid adsorption treatment device 3 can be used to treat the remaining thermal runaway flue gas after being treated by the liquid adsorption treatment device 2, and the thermal runaway flue gas after the combined treatment does not burn at all.

[0086] like Figure 5 As shown, the above-mentioned solid adsorption treatment device 3 is arranged at the rear end of the liquid adsorption treatment device 2, and includes at least one solid treatment tank 31. The specific structure of the solid treatment tank 31 is similar to that of the liquid treatment tank 21. The solid treatment tank 31 is provided with a flue gas inlet and a flue gas outlet, and is filled with a solid adsorption medium for treating the thermal runaway flue gas after being treated in the liquid treatment tank 21.

[0087] The number of the above-mentioned solid processing tanks 31 can be set according to demand. If there are multiple solid processing tanks 31, multiple solid processing tanks 31 can be arranged in series. At this time, the flue gas inlet of the first solid processing tank 31 is connected to the flue gas outlet of the Nth liquid processing tank 21 in the liquid adsorption treatment device 2.

[0088] The solid adsorption medium in the solid treatment tank 31 may be activated carbon, graphene, carbon nanotubes, graphite, alumina, montmorillonite, silicate, phosphate or porous glass, etc., which is used to treat the residual gas after the liquid treatment tank 21 is treated, for example, to adsorb excess H2, CO, methane, ethylene, etc. Preferably, the solid adsorption medium is selected from activated carbon with relatively low cost and relatively excellent treatment effect, generally, activated carbon with high iodine value or modified activated carbon is selected, which is easy to adsorb small molecular weight gases in thermal runaway flue gas, for example, easy to react with hydrogen, methane, etc.

[0089] Table 3 Adsorption test after combining NaOH solution and activated carbon

[0090]

[0091]

[0092] Through the test data, it was found that the use of NaOH solution and activated carbon (No. 1 gas filter canister PB-3 activated carbon) to treat the thermal runaway flue gas of the battery thermal runaway air is very effective. After many tests, it was found that the thermal runaway flue gas after the fully charged 32650 battery ran away was first treated with 1500mL of 0.1mol / LNaOH solution, and then adsorbed by 270g of activated carbon. The collected gas volume was 0.3~0.5L, and the collected gas was non-flammable.

[0093] When a battery experiences thermal runaway, the thermal runaway flue gas generated by the thermal runaway of the battery is transported to the buffer device 1 through the flue gas conveying pipe. The buffer device 1 performs buffering treatment on the thermal runaway flue gas so that the thermal runaway flue gas enters the liquid adsorption treatment device 2 at a relatively stable flow rate. The liquid adsorption treatment device 2 performs targeted treatment on the electrolyte and part of the gas carried in the thermal runaway flue gas of the battery to prevent the vaporized electrolyte from continuing to decompose and react to produce gas, thereby reducing the amount of thermal runaway gas of the battery. Subsequently, the solid treatment tank 31 can complete the treatment of the thermal runaway flue gas with less solid adsorption medium. At the same time, the treated gas is not flammable, thereby improving the safety of the lithium-ion battery during use.

[0094] Example 3

[0095] like Figure 6 As shown, this embodiment is similar to Embodiment 1, and is different from Embodiment 1 in that the adsorption treatment device in this embodiment includes a solid adsorption treatment device 3, and the buffer device 1 is used for buffering the thermal runaway flue gas generated by the thermal runaway of the battery, collecting the electrolyte, and removing impurities, and the solid adsorption treatment device 3 processes the buffered thermal runaway flue gas to reduce the safety hazard caused by the direct discharge of the thermal runaway flue gas of the battery.

[0096] The specific structure of the buffer device 1 in this embodiment is the same as that of the buffer device 1 in Example 1, and will not be described in detail here. The solid adsorption treatment device 3 in this embodiment is arranged at the rear end of the buffer device 1, and includes at least one solid treatment tank 31. The specific structure of the solid treatment tank 31 is similar to that of the liquid treatment tank 21 in Example 1. The solid treatment tank 31 is provided with a flue gas inlet and a flue gas outlet, and is filled with a solid adsorption medium, which is used to treat the thermal runaway flue gas after being treated by the liquid treatment tank 21.

[0097] The number of the above-mentioned solid processing tanks 31 can be set according to demand. If there are multiple solid processing tanks 31, the multiple solid processing tanks 31 can be arranged in series. At this time, the flue gas inlet of the first solid processing tank 31 is connected to the smoke outlet 13 of M buffer tanks 11.

[0098] The solid adsorption medium in the solid treatment tank 31 may be activated carbon, graphene, carbon nanotubes, graphite, alumina, montmorillonite, silicate, phosphate or porous glass, etc., which is used to treat the residual gas after the liquid treatment tank 21 is treated, for example, to adsorb excess H2, CO, methane, ethylene, etc. Preferably, the solid adsorption medium is selected from activated carbon with relatively low cost and relatively excellent treatment effect, generally, activated carbon with high iodine value or modified activated carbon is selected, which is easy to adsorb small molecular weight gases in thermal runaway flue gas, for example, easy to react with hydrogen, methane, etc.

[0099] Example 4

[0100] This embodiment is similar to Embodiment 1 or Embodiment 3, and is different from Embodiment 1 or Embodiment 3 in that the thermal runaway flue gas treatment device in this embodiment further includes a flue gas cooling device 4. The flue gas cooling device 4 is arranged between the buffer device 1 and the liquid adsorption treatment device 2, or the flue gas cooling device 4 is arranged between the buffer device 1 and the solid adsorption treatment device 3, and is used to cool the thermal runaway flue gas. Figure 7 As shown, the following takes the arrangement of the flue gas cooling device 4 between the buffer device 1 and the liquid adsorption treatment device 2 as an example to describe the specific structure and connection relationship of the flue gas cooling device 4.

[0101] like Figure 7 As shown, in this embodiment, the flue gas cooling device 4 includes at least one cooling treatment tank 41. The specific structure of the cooling treatment tank 41 is similar to that of the liquid treatment tank 21. The cooling treatment tank 41 is provided with a flue gas inlet and a flue gas outlet. If there are multiple cooling treatment tanks 41, the multiple cooling treatment tanks 41 can be arranged in series. At this time, the flue gas inlet of the first cooling treatment tank 41 is connected to the smoke outlet 13 of the Mth buffer tank 11, and the smoke outlet of the last cooling treatment tank 41 is connected to the smoke inlet 22 of the first liquid treatment tank 21. Each cooling treatment tank 41 is filled with a cooling medium for cooling the thermal runaway flue gas. The cooling medium can be specifically ceramic balls, silicon dioxide, aluminum oxide, zirconium oxide, titanium oxide, graphite rods, porous ceramics, etc.

[0102] When a battery experiences thermal runaway, the thermal runaway flue gas generated by the thermal runaway of the battery is transported to the buffer device 1 through the flue gas conveying pipe. The buffer device 1 buffers the thermal runaway flue gas so that the thermal runaway flue gas enters the flue gas cooling device 4 at a relatively stable flow rate. The flue gas cooling device 4 cools the thermal runaway flue gas and collects the electrolyte carried in the thermal runaway flue gas. Finally, the liquid adsorption treatment device 2 processes the remaining thermal runaway flue gas, thereby reducing the amount of thermal runaway gas in the battery and improving the safety of the lithium-ion battery during use.

[0103] Example 5

[0104] This embodiment is similar to Embodiment 1, Embodiment 3 or Embodiment 4, and is different from Embodiment 1, Embodiment 3 or Embodiment 4 in that the thermal runaway flue gas treatment device in this embodiment further includes an ignition device 5. The ignition device 5 is disposed at the rear end of the liquid adsorption treatment device 2 to ignite the thermal runaway flue gas treated by the liquid adsorption treatment device 2, or the ignition device 5 is disposed at the rear end of the solid adsorption treatment device 3 to ignite the thermal runaway flue gas treated by the solid adsorption treatment device 3 to reduce the hazards of thermal runaway flue gas discharge. Figure 8 As shown, taking the ignition device 5 disposed at the rear end of the liquid adsorption treatment device 2 as an example, the specific structure and connection relationship of the ignition device 5 are described.

[0105] like Figure 8 As shown, the ignition device 5 in this embodiment includes a flue gas pipeline 51 and at least one group of ignition components, and the flue gas pipeline 51 is connected to the flue gas outlet of the Nth liquid treatment tank 21 in the liquid adsorption treatment device 2. The ignition component is connected to the flue gas pipeline 51. Among them, the number of ignition components can be set according to demand, and can be set to 1 group, 2 groups, 3 groups or 4 groups or multiple groups. When it is set to multiple groups, it can not only fully ignite the thermal runaway flue gas to ensure reliable ignition, but also avoid the safety hazard caused by the failure or failure of a single ignition component, which cannot reliably ignite the thermal runaway flue gas.

[0106] like Figure 8As shown, each ignition assembly includes a smoke exhaust pipe 52 and an igniter 53 arranged at the outlet of the smoke exhaust pipe 52. The smoke exhaust pipe 52 is connected to the smoke pipeline 51 (when there are multiple ignition assemblies, the inlets of the smoke exhaust pipes 52 of the multiple ignition assemblies are all connected to the smoke pipeline 51). The igniter 53 is turned on when any battery has thermal runaway, and then the thermal runaway smoke treated with alkaline solution is transported to the smoke exhaust pipe 52 by the smoke pipeline 51, and the igniter 53 ignites the thermal runaway smoke discharged from the smoke exhaust pipe 52. The igniter 53 can be turned on by a trigger 54, or by a BMS (battery management system). When turned on by the trigger 54, the trigger 54 can be a sensor of different structures, which can be set in the smoke exhaust pipe 52 or on the smoke pipeline 51, and real-time detection of parameters such as temperature, pressure or gas volume fraction can be performed. When the set threshold is exceeded, a signal can be sent to start the igniter 53. Specifically, the above-mentioned trigger 54 can be at least one of a pressure sensor, a gas sensor, an airflow sensor or a temperature sensor. When activated by the trigger 54, a flame arrester 55 may be provided on the exhaust pipe 52. The flame arrester 55 is preferably a pipeline flame arrester, which is used to prevent the flame from being transmitted downward through the exhaust pipe 52 and damaging the trigger 54 and other devices. When activated by the BMS, the BMS monitors the voltage, current and temperature of each battery in the energy storage system in real time. When any battery has thermal runaway, the voltage, current and temperature exceed the threshold, the igniter 53 is activated.

[0107] The above-mentioned igniter 53 can have various structures, for example, an existing arc igniter or a resistance wire igniter can be specifically used. The arc igniter can specifically be a pulse igniter. The power supply method of the igniter 53 can be a dry battery or an alternating current according to the on-site environment. If an arc igniter is used, the arc igniter is installed at the top of the exhaust pipe 52. When the trigger 54 detects that there is thermal runaway smoke in the exhaust pipe 52, a feedback signal is sent to the control circuit board of the arc igniter. The control circuit board connects the dry battery and the booster coil. After the booster coil increases the voltage, the air between the arc generating heads in the arc igniter, which are very close to each other, is ionized to form an arc, igniting the residual thermal runaway smoke. If a resistance wire igniter is used, the resistance wire igniter is installed at the top of the exhaust pipe 52. When the trigger 54 detects thermal runaway smoke in the exhaust pipe 52, a signal is given to the resistance wire igniter. The resistance wire of the resistance wire igniter is rapidly heated to reach the flammable temperature of the gas, and then the residual thermal runaway smoke is ignited.

[0108] When a battery has thermal runaway, the thermal runaway smoke generated by the thermal runaway of the battery is transported to the buffer device 1 through the smoke conveying pipe. The buffer device 1 performs buffering treatment on the thermal runaway smoke so that the thermal runaway smoke enters the liquid adsorption treatment device 2 at a relatively stable flow rate. The liquid adsorption treatment device 2 performs targeted treatment on the electrolyte and part of the gas carried in the thermal runaway smoke of the battery to prevent the vaporized electrolyte from continuing to decompose and react to produce gas, thereby reducing the amount of thermal runaway gas of the battery. Subsequently, the ignition device 5 ignites the thermal runaway smoke treated by the liquid adsorption treatment device 2.

Claims

1. A thermal runaway flue gas treatment device, characterized in that: It includes a buffer device and an adsorption treatment device; The buffer device comprises M buffer tanks, each of which is provided with a smoke inlet and a smoke outlet communicated with an inner cavity thereof, wherein M is an integer greater than or equal to 1; The adsorption treatment device is connected to the smoke outlet of the Mth buffer tank and is used to treat the thermal runaway flue gas.

2. The thermal runaway flue gas treatment device according to claim 1, characterized in that: The adsorption treatment device includes a liquid adsorption treatment device, which includes N liquid treatment tanks, each of which is provided with a smoke inlet and a smoke outlet connected to its inner cavity, and the smoke inlet of the first liquid treatment tank is connected to the smoke outlet of the Mth buffer tank, wherein N is an integer greater than or equal to 1; the liquid treatment tank is filled with a liquid treatment medium.

3. The thermal runaway flue gas treatment device according to claim 1, characterized in that: The adsorption treatment device includes a solid adsorption treatment device, which includes a plurality of solid treatment tanks. The solid treatment tanks are provided with a smoke inlet and a smoke outlet connected to their inner cavities. The smoke inlet of the first solid treatment tank is connected to the smoke outlet of the Mth buffer tank. The solid treatment tank is filled with a solid adsorption medium.

4. The thermal runaway flue gas treatment device according to claim 1, characterized in that: The adsorption treatment device includes a liquid adsorption treatment device and a solid adsorption treatment device. The liquid adsorption treatment device includes at least one liquid treatment tank, which is filled with a liquid treatment medium; the solid adsorption treatment device includes at least one solid treatment tank, which is filled with a solid adsorption medium. The smoke inlet of the first liquid treatment tank is connected to the smoke outlet of the Mth buffer tank, and the smoke outlet of the Nth liquid treatment tank is connected to the smoke inlet of the first solid treatment tank.

5. The thermal runaway flue gas treatment device according to any one of claims 1 to 3, characterized in that: It also includes an ignition device, which is mainly used to ignite the residual thermal runaway flue gas discharged from the adsorption treatment device.

6. The thermal runaway flue gas treatment device according to any one of claims 1 to 3, characterized in that: It also includes a flue gas cooling device; the flue gas cooling device is arranged between the buffer device and the adsorption treatment device, and is mainly used for cooling the thermal runaway flue gas.

7. The thermal runaway flue gas treatment device according to claim 2 or 4, characterized in that: The liquid treatment medium is an alkaline solution.

8. The thermal runaway flue gas treatment device according to claim 7, characterized in that: The alkaline solution is a 0.05-0.5 mol / L NaOH solution.

9. The thermal runaway flue gas treatment device according to claim 7, characterized in that: The smoke inlet and the smoke outlet are both arranged at the top of the liquid treatment tank. The smoke inlet is connected to a smoke inlet pipeline. At least a portion of the smoke inlet pipeline can be immersed in the liquid treatment medium, and a diversion part is provided at the end of the smoke inlet pipeline immersed in the liquid treatment medium. A spiral baffle is provided on the smoke inlet pipeline or a plurality of baffles are provided on the smoke inlet pipeline to increase the distance traveled by the thermal runaway smoke in the liquid treatment tank.

10. The thermal runaway flue gas treatment device according to claim 7, characterized in that: A three-way valve is provided on the smoke outlet of the liquid treatment tank, a first port of the three-way valve is connected to the inner cavity of the liquid treatment tank, a second port is used to discharge the thermal runaway smoke, and a third port is used to inject the liquid treatment medium.

11. The thermal runaway flue gas treatment device according to any one of claims 1 to 4, characterized in that: The smoke inlet and the smoke outlet of the buffer tank are both arranged on the top of the buffer tank.

12. The thermal runaway flue gas treatment device according to claim 11, characterized in that: A drain valve is provided at the bottom of the buffer tank.

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