Thermal runaway flue gas treatment device and electric equipment

Abstract

The utility model discloses a thermal runaway flue gas treatment device and electric equipment. The thermal runaway flue gas treatment device comprises a mixer, the mixer is used for mixing thermal runaway flue gas generated by thermal runaway of the lithium iron phosphate battery with safety gas to form mixed gas and then discharging the mixed gas to the external environment; wherein the volume ratio of the thermal runaway flue gas to the safe gas in the mixed gas is less than 1: 7. According to the utility model, the thermal runaway flue gas and the safety gas are mixed through the mixer, so that the concentration of combustible gas is greatly reduced, and then the problems of explosion and combustion after the thermal runaway flue gas is discharged out of the external environment are reduced and even avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a kind of thermal runaway flue gas treatment device and electrical equipment. BACKGROUND

[0002] Lithium ion battery as a kind of efficient, portable energy storage device, its application field is very extensive. It is mainly applied to electric vehicle, energy storage equipment, aerospace and other fields.

[0003] Lithium iron phosphate battery is more suitable for public transport and cost-sensitive applications due to its safety, durability and cost advantage;

[0004] Lithium iron phosphate battery may still have the risk of thermal runaway due to mechanical, electrical and thermal abuse and its own defects, and if thermal runaway occurs without effective treatment, it will cause safety accidents and threaten the personal safety of surrounding personnel, and the thermal runaway flue gas contains combustible gas, which has a high probability of burning and exploding if not treated in time. SUMMARY

[0005] In order to mainly solve the problem of safety hazard of existing lithium iron phosphate battery due to thermal runaway, the utility model provides a kind of thermal runaway flue gas treatment device.

[0006] The device is applied to lithium iron phosphate battery, comprising a thermal runaway discharge pipeline and a mixer. The thermal runaway discharge pipeline is used to transport the thermal runaway flue gas generated by the thermal runaway of the lithium iron phosphate battery into the mixer. The mixer is used to mix the thermal runaway flue gas with the safety gas to form a mixed gas, which is then discharged to the external environment. The volume ratio of the thermal runaway flue gas to the safety gas in the mixed gas is less than 1:7.

[0007] The utility model discharges the thermal runaway discharge pipeline generated by the thermal runaway of the battery into the mixer, uses the mixer to mix the thermal runaway flue gas with the safety gas to form a mixed gas, and the concentration of combustible gas in the mixed gas is greatly reduced compared with the original concentration of combustible gas in the thermal runaway flue gas, which reduces or even avoids the possibility of explosion and burning of the mixed gas after being discharged to the external environment.

[0008] Further, there is no ignition source within a radius of 1m from the mixed flue gas outlet of the mixer. The so-called ignition source can be: electrical components, lighters, cigarette butts and objects prone to static electricity, etc. Since the mixed gas is further diluted in the atmospheric environment after being discharged to the external environment, the concentration of combustible gas in the mixed gas is further reduced, thereby improving the safety of the mixed gas after being discharged to the external environment.

[0009] Specifically, the thermal runaway smoke treatment device has multiple forms, and preferably, the thermal runaway smoke treatment device used in the utility model specifically comprises a mixer; the mixer comprises converging pipe sections, straight pipe sections and diffusion pipe sections connected in sequence from bottom to top, the lower end of the converging pipe sections is used as a safety gas inlet, and the upper end of the diffusion pipe sections is used as a mixed gas outlet; the part of the thermal runaway discharge pipeline close to the smoke outlet is located in the converging pipe sections, and the flow direction of the thermal runaway smoke in the part of the pipeline is from bottom to top.

[0010] When the thermal runaway smoke is discharged into the mixer, the outlet of the thermal runaway discharge pipeline is located in the converging pipe sections, and the thermal runaway smoke is sprayed upward, so that a low-pressure area is generated at the outlet of the thermal runaway discharge pipeline due to the arrangement of the straight pipe sections and the converging pipe sections, at this time, the low-pressure area attracts the safety gas entering from the lower end of the converging pipe sections, and the thermal runaway smoke and the safety gas are rapidly mixed, so that the concentration of combustible gas in the thermal runaway smoke is greatly reduced, and the mixer can accelerate the mixing speed of the thermal runaway smoke and the safety gas without an additional power source, thereby reducing the cost of thermal runaway smoke treatment.

[0011] Further, in order to save the treatment cost of the thermal runaway smoke, the safety gas is air.

[0012] Further, in order to improve the injection amount and speed of the air and the mixing speed of the air and the thermal runaway smoke in the mixer, the thermal runaway smoke treatment device further comprises a non-powered air extractor; the non-powered air extractor is installed at the lower end of the converging pipe sections. The installation mode of the non-powered air extractor needs to ensure that only the air of the external environment can enter the mixer.

[0013] Further, in order to improve safety, the thermal runaway smoke treatment device further comprises a safety gas source connected with the safety gas inlet, and the safety gas filled in the safety gas source is carbon dioxide or nitrogen.

[0014] The second aspect of the utility model provides a kind of electric equipment, including multiple single batteries and the thermal runaway smoke treatment device as described in the first aspect;

[0015] The thermal runaway smoke treatment device comprises a mixer and a thermal runaway discharge pipeline.

[0016] The thermal runaway discharge pipeline comprises a main pipe and multiple branch pipes.

[0017] Each single battery is connected with a branch pipe between the main pipe, and the branch pipe covers the explosion venting part of the single battery;The thermal runaway smoke outlet of the main pipe is communicated with the mixer of the thermal runaway smoke treatment device.

[0018] In the power equipment, the thermal runaway smoke is discharged to the mixer through the branch pipes and the main pipe, so that the electrolyte ejected by the thermal runaway of a single battery can not contact the adjacent single battery, and the problem of the thermal runaway spreading caused by the short circuit or abnormal chemical reaction of the adjacent single battery is avoided.

[0019] Further, the plurality of single batteries are located in a housing, and the mixer is located outside the housing, and the thermal runaway discharge pipeline transports the thermal runaway smoke to the outside of the housing and then into the mixer.

[0020] The third aspect of the utility model provides another power equipment, including energy storage cabinet, a plurality of battery packs and the thermal runaway smoke treatment device as described in the first aspect;

[0021] The thermal runaway smoke treatment device comprises a mixer and a thermal runaway discharge pipeline.

[0022] The thermal runaway discharge pipeline comprises a main pipe and a plurality of branch pipes, and each branch pipe is connected between the smoke outlet of each battery pack and the main pipe.

[0023] The plurality of battery packs are installed in the energy storage cabinet, and the mixer is located outside the energy storage cabinet.

[0024] The battery pack comprises a housing, an explosion venting pipeline and a plurality of single batteries, the plurality of single batteries are located in the housing, the plurality of smoke inlets on the explosion venting pipeline cover the explosion venting parts of each single battery, and the smoke outlet of the explosion venting pipeline is connected with the smoke outlet of the battery pack.

[0025] The thermal runaway smoke is sequentially transported from the explosion venting pipeline, the branch pipe and the main pipe to the mixer and mixed with the safety gas.

[0026] In the power equipment, the thermal runaway smoke is discharged to the outside of the battery pack through the explosion venting pipeline, so that the electrolyte ejected by the thermal runaway of a single battery in the battery pack can not contact the adjacent single battery, and the problem of the thermal runaway spreading caused by the short circuit or abnormal chemical reaction of the adjacent single battery in the battery pack is avoided.

[0027] In addition, the thermal runaway smoke is discharged to the outside of the energy storage cabinet through the branch pipe and the main pipe, so that the ejected electrolyte can not contact some electrical elements in the energy storage cabinet, the corrosion of the electrolyte to the electrical elements in the energy storage cabinet is avoided, and the problem of the thermal runaway spreading caused by the short circuit of the electrical elements in the energy storage cabinet is avoided.

[0028] Further, the mixer is located above the energy storage cabinet, the mixed gas outlet of the mixer faces the sky and is located at a distance of more than 1m from the top of the energy storage cabinet. The setting mode of the mixer further ensures the safety of the mixed gas discharged to the outside of the energy storage cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of Example 1;

[0030] Figure 2 This is a structural schematic diagram of Example 2;

[0031] Figure 3 This is a structural schematic diagram of Example 3;

[0032] Figure 4 This is a structural schematic diagram of Example 4;

[0033] Figure 5 This is a structural schematic diagram of Example 5.

[0034] The attached figures are labeled as follows:

[0035] 100-Mixer, 201-Converging pipe section, 202-Straight pipe section, 203-Diffusion pipe section, 1-T-way pipe assembly, 2-First-stage exhaust fan, 11-First pipeline, 12-Second pipeline, 13-Third pipeline, 14-Second-stage exhaust fan, 15-Mixing chamber, 16-Safety gas source, 17-Mixed gas exhaust pipe, 300-Thermal runaway exhaust pipe, 301-Branch pipe, 302-Main pipe, 400-Single cell, 500-Shell, 600-Energy storage cabinet, 700-Explosion relief pipe, 800-Battery pack. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0037] The phrase "other embodiments" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0038] In this specification, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] Furthermore, in the description of this utility model, it should be noted that the terms "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] When a battery experiences thermal runaway, there are currently two main methods for handling it:

[0041] Measure 1: This measure is currently widely used. Specifically, it uses fire-fighting media such as heptafluoropropane, perfluorohexanone, fine water mist, and aerosol to suppress thermal runaway. However, this method has high fire-fighting costs, especially when combined with the widely used perfluorohexanone fire extinguishing medium, which will cause a sharp increase in the cost of handling thermal runaway.

[0042] Measure 2: Existing technologies have proposed a relatively cost-effective method for large-scale energy storage power generation stations. Since the external environment of the station is relatively open, when the battery experiences thermal runaway, the thermal runaway flue gas can be directly discharged into the external environment. However, the application of this solution has significant limitations. For example, if this solution is applied to electric vehicle charging stations, industrial and commercial energy storage, etc., the external environment of these scenarios is relatively complex, and equipment such as photovoltaic panels and charging piles may generate static electricity, which could lead to a greater risk of danger.

[0043] Since both of the above methods have their own problems, this utility model provides a thermal runaway flue gas treatment device for lithium iron phosphate batteries, including a thermal runaway emission pipeline and a mixer. The thermal runaway emission pipeline is used to transport the thermal runaway flue gas generated by the thermal runaway of the lithium iron phosphate battery to the mixer. The mixer is used to mix the thermal runaway flue gas with a safety gas to form a mixed gas before it is discharged to the external environment. The volume ratio of thermal runaway flue gas to safety gas in the mixed gas is less than 1:7. This utility model mixes the thermal runaway flue gas and safety gas through the mixer, which greatly reduces the concentration of combustible gas, thereby reducing or even avoiding the problem of explosion and combustion after the thermal runaway flue gas is discharged to the external environment.

[0044] It should be noted that:

[0045] 1. A battery can be a commercially available single cell, such as a prismatic lithium-ion battery, a pouch battery, or a cylindrical battery; it can also be a battery pack, which is generally composed of multiple single cells connected in series, parallel, or mixed connections; or it can be a high-capacity battery proposed in the prior art, which is composed of multiple single cells connected in parallel, and the multiple single cells are in a shared electrolyte system.

[0046] 2. During thermal runaway, a series of violent chemical reactions occur inside the lithium iron phosphate battery, generating a large amount of heat and flammable and toxic gases. These gases include, but are not limited to, hydrogen (H2), carbon monoxide (CO), methane (CH4), and other hydrocarbons. When these gases mix with air within a specific concentration range, they may form an explosive mixture.

[0047] 3. Safety gases can be inert gases such as nitrogen, carbon dioxide, or air. Using inert gases or carbon dioxide as safety gases offers higher safety than using air. However, due to the large volume of safety gases used, using air as a safety gas is less expensive than using inert gases or carbon dioxide.

[0048] 4. The external environment mentioned in the text refers to the atmospheric environment. Ideally, it should be a relatively open, spacious environment.

[0049] This utility model provides the following types of thermal runaway flue gas treatment devices and specific embodiments of their application in electrical equipment.

[0050] Example 1

[0051] This embodiment provides a thermal runaway flue gas treatment device, wherein the safety gas used in the thermal runaway flue gas treatment device is air; such as Figure 1 As shown, the thermal runaway flue gas treatment device includes a mixer 100 and a thermal runaway emission pipeline 300; the mixer 100 has a tubular structure; the mixer 100 includes a converging pipe section 201, a straight pipe section 202 and a diffuser pipe section 203 connected sequentially from bottom to top, the lower port of the converging pipe section 201 serves as a safety gas inlet, and the upper port of the diffuser pipe section 203 serves as a mixed gas outlet; a portion of the thermal runaway emission pipeline near the flue gas outlet is located in the converging pipe section 201, and the flow direction of the thermal runaway flue gas in the portion of the pipe section is from bottom to top.

[0052] When a battery experiences thermal runaway, the runaway gas flows through the thermal runaway emission pipeline to the mixer. Due to the arrangement of the straight and converging pipe sections, a low-pressure zone is created at the outlet of the thermal runaway emission pipeline. This low-pressure zone attracts safety gas entering from the lower port of the converging pipe section. The thermal runaway gas and safety gas mix rapidly and are then discharged into the external environment through the upper port of the diffuser section. This significantly reduces the concentration of combustible gases in the thermal runaway gas. Furthermore, this mixer can accelerate the mixing speed of the thermal runaway gas and safety gas without requiring an additional power source, reducing the cost of thermal runaway gas treatment. To ensure the correct ratio of safety gas to thermal runaway gas entering the mixer, the diameter of the section of the thermal runaway emission pipeline near the gas outlet and the diameter of each section in the mixer can be pre-set, thereby controlling the volume ratio of thermal runaway gas to safety gas to maintain below 1:8 for safe emission.

[0053] In some other embodiments, a non-powered exhaust fan can also be installed at the lower port of the converging pipe section 201. The installation method of the non-powered exhaust fan needs to ensure that only ambient air can enter the mixer. The non-powered exhaust fan can increase the amount of ambient air entering the main pipe per unit time. At the same time, the non-powered exhaust fan has no additional electrical components, which can also avoid the occurrence of danger.

[0054] In some other embodiments, the lower port of the converging tube section 201 may also be connected to a safety gas source, wherein the safety gas in the safety gas source is carbon dioxide or nitrogen.

[0055] Example 2

[0056] This embodiment provides a thermal runaway flue gas treatment device, which uses air as the safety gas; the difference between this embodiment and embodiment 1 is that the mixer 100 used is different.

[0057] like Figure 2 As shown, the mixer 100 consists of a three-way pipe assembly 1 and a primary exhaust fan 2; the three-way pipe assembly 1 includes a first pipe 11, a second pipe 12 and a third pipe 13 that are interconnected; the first pipe 11 serves as a mixed flue gas emission pipe and the primary exhaust fan 2 is installed on the first pipe 11; the second pipe 12 is used to connect with the thermal runaway emission pipe 300, and the third pipe 13 is used to introduce air.

[0058] When the device is in operation, if thermal runaway of the battery is detected, the primary exhaust fan 2 starts working. The thermal runaway flue gas and outside air enter the first pipe 11 to form a mixed gas, which is then discharged into the external environment through the first pipe 11. By pre-setting the diameter of the second pipe 12 and the third pipe 13, the volume ratio of thermal runaway flue gas to safety gas is controlled to be maintained below 1:7 before being discharged into the external environment through the first pipe 11.

[0059] Preferably, to ensure a sufficient amount of air mixes with the thermal runaway flue gas per unit time, a secondary exhaust fan 14 is installed on the third pipeline 13. By turning on the secondary exhaust fan 14, the gas flow rate in the third pipeline 13 per unit time can be increased, which can quickly reduce the concentration of combustible gas in the mixed gas and further improve the safety of the mixed gas discharged into the external environment.

[0060] In some other embodiments, the third conduit 13 may also be connected to a safe gas source containing carbon dioxide or inert gas.

[0061] Example 3

[0062] This embodiment provides a thermal runaway flue gas treatment device. The difference between this embodiment and Embodiment 1 is that the mixer 100 used is different; for example... Figure 3 As shown, the mixer 100 includes a mixing chamber 15, a safety gas source 16, and a mixed gas discharge pipe 17. The mixing chamber 15 is equipped with a thermal runaway gas inlet and a mixed gas outlet, and the mixed gas discharge pipe 17 is installed at the mixed gas outlet. The safety gas source 16 injects inert gas or carbon dioxide into the mixing chamber. During operation, when thermal runaway of the battery is detected, the thermal runaway gas enters the mixing chamber, and simultaneously, the safety gas source 16 injects safety gas into the mixing chamber. By controlling the injection volume of the safety gas and the diameter of the thermal runaway gas inlet, the volume ratio of the thermal runaway gas to the safety gas is maintained below 1:7 before being safely discharged to the external environment through the mixed gas discharge pipe 17. In this embodiment, the safety gas source is carbon dioxide.

[0063] Example 4

[0064] This embodiment provides an electrical device that uses only one battery pack 800; such as Figure 4 As shown, the electrical equipment mainly includes a battery pack composed of multiple individual batteries 400 connected in series, parallel or mixed, and a thermal runaway flue gas treatment device as described in Examples 1 to 3.

[0065] The thermal runaway flue gas treatment device includes a mixer 100 and a thermal runaway discharge pipeline 300;

[0066] The thermal runaway emission pipeline 300 includes a main pipe 302 and multiple branch pipes 301; each individual cell 400 is connected to a branch pipe 301, and the branch pipe 301 covers the explosion vent of the individual cell; the thermal runaway flue gas outlet of the main pipe 302 is connected to the mixer.

[0067] In some embodiments, multiple individual cells 400 in the battery pack 800 are located inside a housing 500, and the mixer 100 is located outside the housing 500. The main pipe 302 in the thermal runaway emission pipeline 300 delivers the thermal runaway flue gas to the outside of the housing 500, where it enters the mixer 100 to mix with the safety gas before being safely discharged into the external environment.

[0068] Example 5

[0069] This embodiment provides an electrical device, which is actually an energy storage device (it can be a residential energy storage, industrial or commercial energy storage, or a power generation-side energy storage device); such as Figure 5 As shown, the electrical equipment includes an energy storage cabinet 600, multiple battery packs 800, and a thermal runaway flue gas treatment device as described in Examples 1 to 3.

[0070] The thermal runaway flue gas treatment device includes a mixer 100 and a thermal runaway discharge pipeline 300;

[0071] Multiple battery packs 400 are installed inside the energy storage cabinet 600; the mixer 100 in the thermal runaway flue gas treatment device is located outside the energy storage cabinet 600;

[0072] Thermal runaway discharge pipeline 300 includes a main pipe 302 and multiple branch pipes 301;

[0073] Each battery pack 800 has a branch pipe 301 connected between its flue gas outlet and the main pipe 302; the thermal runaway flue gas is transported to the outside of the housing 500 and then enters the thermal runaway emission pipeline 300.

[0074] The battery pack 800 includes a housing 500, a venting conduit 700, and multiple individual batteries 400. The multiple individual batteries 400 are located inside a housing 500. Multiple flue gas inlets on the venting conduit 700 cover the venting part of each individual battery 400, and the flue gas outlet of the venting conduit 700 is connected to the flue gas outlet of the battery pack.

[0075] When any single cell in a battery pack experiences thermal runaway, the thermal runaway gas is first discharged from the battery pack through the explosion relief pipe 700, and then sequentially discharged from the branch pipe and the main pipe to the mixer outside the energy storage cabinet. Finally, the thermal runaway gas and the safety gas are mixed to form a mixed gas that is safely discharged to the external environment.

[0076] Preferably, in this embodiment, the mixer is located above the energy storage cabinet, with the mixed gas outlet of the mixer facing the sky and at least 1 meter away from the top of the energy storage cabinet. This arrangement of the mixer further ensures the safety of the mixed gas after it is discharged from the energy storage cabinet.

[0077] It should be noted that the explosion relief pipe 700 in this embodiment is actually similar in structure to the thermal runaway discharge pipe in embodiment 4, and also includes branch pipes and main pipes; in some other embodiments, a pipe can also be fixed to the top of each individual cell and cover the explosion relief part of each individual cell.

[0078] In some other embodiments, the explosion relief pipe 700 may not be installed in the battery pack. The thermal runaway flue gas can be discharged directly to the mixer outside the energy storage cabinet through the thermal runaway emission pipe after passing through the battery pack housing. However, this method may cause the thermal runaway to spread inside the battery pack housing, which poses a certain safety hazard.

[0079] In some other embodiments, in order to make the thermal runaway discharge pipeline structure more compact and thus ensure the energy density of the energy storage cabinet, the main pipe in the thermal runaway discharge pipeline may adopt a support frame that supports multiple battery packs.

Claims

1. A thermal runaway smoke treatment device applied to a lithium iron phosphate battery, characterized in that, The thermal runaway exhaust pipeline is used to transport the thermal runaway flue gas generated by the thermal runaway of the lithium iron phosphate battery to the mixer, and the mixer is used to mix the thermal runaway flue gas with the safety gas to form mixed gas which is then discharged to the external environment; wherein the volume ratio of the thermal runaway flue gas to the safety gas in the mixed gas is less than 1:

7.

2. The thermal runaway gas fume treatment device of claim 1, wherein, There is no ignition source within a radius of 1 m from the mixed flue gas outlet of the mixer.

3. The thermal runaway gas handling device of claim 1 or 2, wherein, The mixer is a tubular structure; the mixer comprises a converging pipe section, a straight pipe section and a diffusion pipe section connected in sequence from bottom to top, the lower end of the converging pipe section serving as a safety gas inlet, and the upper end of the diffusion pipe section serving as a mixed gas outlet; the part of the thermal runaway exhaust pipeline near the flue gas outlet is located in the converging pipe section, and the flow direction of the thermal runaway flue gas in the part is from bottom to top.

4. The thermal runaway smoke gas treatment device of claim 3, wherein, The safety gas is air.

5. The thermal runaway smoke gas treatment device of claim 4, wherein, The unpowered exhaust fan is installed at the lower end of the converging pipe section.

6. The thermal runaway smoke gas treatment device of claim 3, wherein, The safety gas source connected to the safety gas inlet is also included, and the safety gas filled in the safety gas source is carbon dioxide or nitrogen.

7. An electric device, characterized by The thermal runaway flue gas treatment device comprises a mixer and a thermal runaway exhaust pipeline. The thermal runaway flue gas treatment device comprises a mixer and a thermal runaway exhaust pipeline. The thermal runaway exhaust pipeline comprises a main pipe and a plurality of branch pipes. Each single battery is connected with a branch pipe between the single battery and the main pipe, and the branch pipe covers the explosion vent of the single battery; the thermal runaway flue gas outlet of the main pipe is in communication with the mixer of the thermal runaway flue gas treatment device.

8. The power utilization device of claim 7, wherein, The plurality of single batteries are located in a housing, and the mixer is located outside the housing, and the main pipe of the thermal runaway exhaust pipeline transports the thermal runaway flue gas outside the housing and then into the mixer.

9. An electric device, characterized by The thermal runaway flue gas treatment device comprises a mixer and a thermal runaway exhaust pipeline. The thermal runaway flue gas treatment device comprises a mixer and a thermal runaway exhaust pipeline. The thermal runaway exhaust pipeline comprises a main pipe and a plurality of branch pipes; each battery pack is connected with a branch pipe between the flue gas port of the battery pack and the main pipe. The plurality of battery packs are installed in the energy storage cabinet; the mixer is located outside the energy storage cabinet. The battery pack comprises a housing, an explosion vent pipeline and a plurality of single batteries; the plurality of single batteries are located in a housing, and the plurality of flue gas inlets of the explosion vent pipeline cover the explosion vent of each single battery, and the flue gas outlet of the explosion vent pipeline is connected with the flue gas port of the battery pack. The thermal runaway flue gas is transported from the explosion vent pipeline, the branch pipe and the main pipe to the mixer in sequence and mixed with the safety gas.

10. The power utilization device of claim 9, wherein, The mixer is located above the energy storage cabinet, the mixed gas outlet of the mixer is directed towards the sky and is located at a distance of more than 1 m from the top of the energy storage cabinet.

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