Lithium battery energy storage cabinet thermal safety management system

Abstract

The utility model discloses a thermal safety management system for a lithium battery energy storage cabinet, which belongs to the technical field of energy storage and comprises a lithium battery energy storage system. A plurality of battery packs are arranged in the lithium battery energy storage system, a plurality of lithium battery units are arranged in the battery packs, and each battery pack is connected with an exhaust and smoke exhaust pipeline; the exhaust and smoke exhaust pipeline comprises a main pipeline, a plurality of branch pipelines and an output pipeline, one end of each branch pipeline is communicated with the main pipeline, and the other end of each branch pipeline is connected with the battery pack through an anti-explosion valve; one end of the output pipeline communicates with the main pipeline, and the other end communicates with the outside of the energy storage system. According to the utility model, flammable and explosive gas in the battery pack subjected to thermal runaway is discharged out of the energy storage system through the explosion-proof valve and the exhaust and smoke exhaust pipeline, so that the flammable and explosive gas can be prevented from being accumulated in the energy storage system to cause safety accidents, and the thermal safety risk of the energy storage system is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and specifically, to a thermal safety management system for a lithium battery energy storage cabinet. Background Technique

[0002] In the new energy storage industry, lithium battery energy storage power stations combine solar energy, wind energy and various energy sources with unstable inputs, and can effectively perform frequency modulation on unstable new energy, so that the frequency of the new energy conversion output end is always consistent with the load end. Therefore, the energy storage power station is a crucial link for storing energy and regulating frequency. Whether in the field of power batteries or energy storage batteries, it is crucial to develop the lithium battery field. However, although lithium batteries have prominent advantages, their disadvantages are also obvious. The safety problem after the thermal runaway of lithium batteries has always been a pain point in the lithium battery industry.

[0003] The research in the industry on the problem of battery thermal runaway mainly focuses on how to actively extinguish the fire after the battery thermal runaway, mainly including the isolation method, the asphyxiation method, the cooling method and the chemical fire extinguishing method. For example, the Chinese patent document with the publication number CN114300773A discloses a lithium battery energy storage cabinet automatic protection system, including a carbon dioxide storage tank and a lithium battery energy storage cabinet body. The outlet of the carbon dioxide storage tank is connected to a main pipe through a first air pipe. A first electric ball valve and a compressor are installed on the pipe section of the first air pipe. The first air pipe is connected in parallel with a second air pipe. A second electric ball valve is installed on the pipe section of the second air pipe. The main pipe is connected with a plurality of unit pipes. The unit pipes are connected with rubber pipes. The rubber pipes are connected with a housing. The housing is fixed on the inner wall of the lithium battery energy storage cabinet body. A plurality of nozzles are arranged on the side of the housing. The technical solution in this patent document mainly uses low-temperature carbon dioxide to cool and extinguish the burning lithium battery.

[0004] In addition to using low-temperature carbon dioxide for fire extinguishing as mentioned above, the most effective method is to directly cool and extinguish the thermally runaway battery with liquid water or gaseous water. Although it can control the spread of battery thermal runaway and extinguish the flame, a large amount of water injection also makes the entire lithium battery system paralyzed and scrapped, resulting in huge economic losses. Other methods also have similar effects, either with poor fire extinguishing effect or huge economic losses. And these studies all focus on the treatment after the battery thermal runaway catches fire or even explodes, and the safety measures are lagging. These cannot solve the safety problem from the root cause. Content of the Utility Model

[0005] The purpose of the utility model is to provide a thermal safety management system for a lithium battery energy storage cabinet, so as to solve the problem that in the prior art, the treatment measures for the energy storage cabinet in the face of battery thermal runaway mostly focus on after the battery catches fire or even explodes, and the safety measures are lagging.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a thermal safety management system for a lithium-ion energy storage cabinet, comprising a lithium-ion energy storage system; a plurality of battery packs are arranged in the lithium-ion energy storage system, and the battery packs are sealed shell structures; a plurality of lithium-ion battery cells are arranged inside the battery packs, and each of the battery packs is connected to an exhaust and smoke exhaust pipe; the exhaust and smoke exhaust pipe includes a main pipe, a plurality of branch pipes and an output pipe, one end of the branch pipe is connected to the main pipe, and the other end is connected to the battery pack through an explosion-proof valve; one end of the output pipe is connected to the main pipe, and the other end is connected to the outside of the lithium-ion energy storage system.

[0007] Through the above technical solution, the battery pack serves as a sealed structure, which can separate the entire energy storage cabinet into several independent energy storage spaces. At the same time, the battery pack can also isolate safety accidents in a single sealed space, thereby improving safety. The various branches of the exhaust and smoke exhaust pipeline are connected to the battery pack through explosion-proof valves. When the temperature and pressure inside the battery pack increase, the explosion-proof valve opens and guides the smoke inside the battery pack into the branch pipeline. The branch pipeline collects the smoke into the main pipeline and outputs it to the outside of the lithium battery energy storage system through the branch pipeline. By discharging flammable and explosive gases in the energy storage system in advance through explosion-proof valves and exhaust and smoke exhaust pipelines, fires and explosions in the energy storage system can be prevented, thus resolving safety risks in advance.

[0008] Furthermore, the explosion-proof valve includes an explosion-proof body, which is installed on the outer surface of the battery pack through a fixed bracket; the explosion-proof body includes a valve tube, which extends into the interior of the battery pack; a protective cover is provided on the side of the explosion-proof body opposite to the valve tube, the protective cover is connected to the guide cover, and the guide cover is connected to the branch pipe.

[0009] The explosion-proof body can be fixedly mounted on the surface of the battery pack via a fixing bracket. The valve tube extends into the battery pack, connecting the explosion-proof body with the interior of the battery pack, allowing for timely discharge of gas when the gas inside the battery pack expands. The protective cover and guide cover connect the explosion-proof body to the branch pipe, thereby connecting the branch pipe to the interior of the battery pack when the explosion-proof valve is opened, thereby discharging the gas inside the battery pack for pressure relief.

[0010] Furthermore, the explosion-proof main body includes a ring body, and an explosion-proof plate is arranged between the ring body and the protective cover; a valve core is arranged in the valve tube, and the valve core is used to push open the explosion-proof plate.

[0011] The ring body is the external support structure of the explosion-proof body and is installed with a fixed bracket. The explosion-proof disk is installed in conjunction with the ring body to maintain a seal. When pressure is applied, the valve core pushes open the explosion-proof disk, thereby helping to relieve pressure in the battery pack and prevent explosion.

[0012] Furthermore, the valve core is movably connected to the valve tube and a support spring is provided between the two. A blind hole is provided at one end of the valve core facing the inner side of the battery pack.

[0013] The supporting spring keeps the valve core in position within the valve tube. The blind hole of the valve core has a smaller cross-sectional area relative to the valve core. When the temperature inside the battery pack rises and the pressure increases, gas is injected into the blind hole, further increasing the pressure exerted on the valve core, thereby pushing the valve core to open the explosion-proof film.

[0014] Furthermore, a connecting groove is provided on the outer side of the explosion-proof main body, and a buckle is correspondingly provided on the inner side of the protective cover for engaging with the connecting groove; a regulating bolt is provided through the protective cover corresponding to the position of the buckle, and the regulating bolt is connected to the buckle through a spring member.

[0015] The protective cover and the explosion-proof main body are quickly installed through the connecting groove and the buckle, while ensuring the stability of the installation. Rotating the regulating bolt inward can compress the spring member, and when the spring member is compressed, the pressure on the buckle can be increased, improving the fastening between the buckle and the connecting groove. Rotating the regulating bolt outward can stretch the spring member, and when the spring member is stretched, the buckle can be pulled outward, thereby separating the buckle from the connecting groove, facilitating the disassembly of the protective cover and the explosion-proof main body.

[0016] Furthermore, a sealing groove is provided at the connection end of the guiding cover and the branch pipeline, and a sealing member is installed in the sealing groove to seal the connection between the guiding cover and the branch pipeline.

[0017] The sealing groove and the sealing member cooperate with each other to improve the connection sealing performance between the guiding cover and the branch pipeline, prevent gas leakage when the gas is exported, and avoid the leaked gas from affecting other components inside the lithium battery energy storage system.

[0018] Furthermore, the axial length of the protective cover is greater than the movement stroke of the explosion-proof film.

[0019] The axial length of the protective cover is relatively larger, providing sufficient space for the movement stroke of the explosion-proof film to be completed entirely, enabling the explosion-proof film to be fully opened by the valve core, and improving the pressure relief efficiency.

[0020] Furthermore, the exhaust and smoke exhaust pipeline is a composite structure, including a diversion layer, a heat insulation layer, and a support layer from the inside to the outside.

[0021] The diversion layer is used for diverting gas, the heat insulation layer can insulate heat and inhibit the transfer of heat to the outer layer; the support layer can support the pipeline structure and shape. Generally speaking, the composite structure pipeline has the advantages of light weight and high temperature resistance compared with traditional metal pipelines.

[0022] Furthermore, an exhaust and smoke exhaust power device is also included. The exhaust and smoke exhaust power device includes a power element, a control unit, and a sensor. The power element is connected to the control unit, and the control unit is electrically connected to the sensor; the power element is connected to the exhaust and smoke exhaust pipeline, and the sensor is arranged inside the battery pack.

[0023] The exhaust and smoke exhaust power device can enhance the accelerated discharge of gas from the pipeline. The control unit can control the operation of the power element, and the sensor can be used to monitor the temperature rise, pressure change, and the opening condition of the explosion-proof valve inside the battery pack.

[0024] Furthermore, a dust-proof structure is provided at one end of the output pipeline located outside the lithium-ion energy storage system, and the dust-proof structure is installed on the outer side of the lithium-ion energy storage system.

[0025] The dust-proof structure can prevent dust from entering the exhaust and smoke exhaust pipeline, avoid blockage of the output pipeline caused by dust, and also prevent damage to other components after dust enters the pipeline.

[0026] Adopting the technical solution provided by the present utility model, compared with the existing well-known technologies, it has the following beneficial effects:

[0027] (1) In the thermal safety management system of a lithium-ion energy storage cabinet of the present utility model, each branch pipeline of the exhaust and smoke exhaust pipeline is connected to the battery pack through an explosion-proof valve. When the temperature rises and the pressure increases inside the battery pack, the explosion-proof valve opens to introduce the flue gas inside the battery pack into the branch pipeline. The branch pipeline converges the flue gas into the main pipeline and outputs it outside the lithium-ion energy storage system through the branch pipeline. By discharging the pressure inside the battery pack in advance through the explosion-proof valve and the exhaust and smoke exhaust pipeline, the explosion of the battery pack can be prevented, and the safety risk can be solved in advance.

[0028] Obviously, the elements or features described in the above single embodiments can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the drawings, the dimensions and ratios do not represent the dimensions and ratios of the actual product. The drawings are merely illustrative, and for clarity, some non-essential elements or features are omitted.

[0030] Figure 1 is the external structure schematic diagram of the lithium-ion energy storage system in the embodiment of the present utility model;

[0031] Figure 2 is the internal structure schematic diagram of the lithium-ion energy storage system in the embodiment of the present utility model;

[0032] Figure 3 is the structural schematic diagram (I) of the explosion-proof valve in the embodiment of the present utility model;

[0033] Figure 4 is the structural schematic diagram (II) of the explosion-proof valve in the embodiment of the present utility model;

[0034] Figure 5 is the structural view of the side of the explosion-proof valve connected to the battery pack in the embodiment of the present utility model;

[0035] Figure 6 isFigure 5 Schematic cross-sectional structure view at A-A in the middle;

[0036] Figure 7 It is a schematic separated structure view of the explosion-proof main body and the protective cover in the embodiment of the present utility model;

[0037] Figure 8 It is a schematic cross-sectional structure view of the exhaust and smoke exhaust pipeline in the embodiment of the present utility model.

[0038] Description of reference numerals

[0039] 100, lithium battery energy storage system; 110, dust-proof structure; 200, battery pack; 300, exhaust and smoke exhaust pipeline; 301, diversion layer; 302, heat insulation layer; 303, support layer; 310, main pipeline; 320, branch pipeline; 330, output pipeline; 400, explosion-proof valve; 410, explosion-proof main body; 411, valve pipe; 412, valve core; 413, blind hole; 414, support spring; 415, explosion-proof sheet; 416, ring body; 417, connection groove; 420, protective cover; 421, buckle; 422, spring member; 423, adjusting bolt; 430, guiding cover; 431, sealing groove; 440, fixing bracket. Detailed implementation manners

[0040] Next, the present utility model will be described in detail with reference to the drawings. What is described here is only the preferred implementation manner of the present utility model. Those skilled in the art can think of other ways to implement the present utility model based on the preferred implementation manner, and other ways also fall within the scope of the present utility model.

[0041] Embodiment

[0042] Refer to Figures 1-8This embodiment provides a thermal safety management system for a lithium-ion energy storage cabinet, comprising a lithium-ion energy storage system 100; a plurality of battery packs 200 are disposed within the lithium-ion energy storage system 100, and the battery packs 200 are sealed shell structures. The lithium-ion energy storage system 100 is specifically a cabinet-type structure. The battery packs 200, as a sealed structure, can divide the entire energy storage cabinet into a plurality of independent energy storage spaces. At the same time, the battery packs 200 can also isolate safety accidents in a single sealed space, thereby improving safety. A plurality of lithium-ion battery cells are disposed within the battery pack 200, and each battery pack 200 is connected to an exhaust and smoke exhaust pipe 300; the exhaust and smoke exhaust pipe 300 includes a main pipe 310, a plurality of branch pipes 320, and an output pipe 330. One end of the branch pipe 320 is connected to the main pipe 310, and the other end is connected to the battery pack 200 through an explosion-proof valve 400; one end of the output pipe 330 is connected to the main pipe 310, and the other end is connected to the outside of the lithium-ion energy storage system 100. When the temperature and pressure inside the battery pack 200 rise, the explosion-proof valve 400 opens, directing the smoke from the battery pack 200 into the branch pipe 320. The branch pipe 320 then flows the smoke into the main pipe 310, which then outputs the smoke out of the lithium-ion energy storage system 100. By using the explosion-proof valve 400 and the exhaust and smoke exhaust pipe 300 to preemptively discharge flammable and explosive gases from the battery pack 200, the lithium-ion energy storage system 100 can be prevented from catching fire or exploding, effectively mitigating safety risks.

[0043] It should be noted that the battery packs 200 are spaced apart and vertically stacked in multiple layers within the lithium-ion energy storage system 100 via a support frame or other structure. Liquid cooling plates are positioned between the battery packs 200, with cooling pipes connecting the plates. These pipes help circulate the coolant within the plates, improving temperature control within the energy storage cabinet and preventing overheating.

[0044] In some embodiments of this application, please refer to Figure 3 and Figure 4 The explosion-proof valve 400 includes an explosion-proof body 410, which is mounted on the outer surface of the battery pack 200 via a fixing bracket 440. The fixing bracket 440 is provided with a mounting hole, which is used with fasteners such as bolts to mount the explosion-proof body 410 on the outer shell of the battery pack 200. The explosion-proof body 410 includes a valve tube 411, which extends into the interior of the battery pack 200. The valve tube 411 can connect the explosion-proof body 410 with the interior of the battery pack 200. A protective cover 420 is provided on the side of the explosion-proof body 410 opposite the valve tube 411. The protective cover 420 is connected to a guide cover 430, which is connected to the branch line 320. The protective cover 420 and the guide cover 430 can connect the explosion-proof body 410 and the branch line 320, thereby achieving communication between the branch line 320 and the interior of the battery pack 200 after the explosion-proof valve 400 is opened, thereby draining the gas inside the battery pack 200 for pressure relief.

[0045] Specifically, as Figure 5 and Figure 6 shown, the explosion-proof main body 410 includes a ring body 416. The ring body 416 is an external support structure of the explosion-proof main body 410 and is installed in cooperation with the fixing bracket 440. An explosion-proof sheet 415 is provided between the ring body 416 and the protective cover 420. The explosion-proof sheet 415 is installed in cooperation with the ring body 416 to maintain sealing. The explosion-proof sheet 415 is movable relative to the ring body 416 and can be separated from the ring body 416 when subjected to an external force. A valve core 412 is provided in the valve pipe 411. The valve core 412 is used to push open the explosion-proof sheet 415 when subjected to pressure, thereby helping the battery pack 200 to relieve pressure and preventing the battery pack 200 from exploding.

[0046] Furthermore, as Figure 6 shown, the valve core 412 is movably connected to the valve pipe 411 and a support spring 414 is provided therebetween. A blind hole 413 is provided at one end of the valve core 412 facing the inner side of the battery pack 200. The support spring 414 keeps the valve core 412 in position in the valve pipe 411. The blind hole 413 of the valve core 412 has a smaller cross-sectional area relative to the valve core 412. When the temperature inside the battery pack 200 rises and the pressure increases, gas is injected into the blind hole 413, further increasing the pressure exerted on the valve core 412, thereby pushing the valve core 412 to push open the explosion-proof sheet 415. It should be noted that the blind hole 413 extends along the axial direction of the valve core 412.

[0047] In some embodiments of the present application, as Figure 7 shown, a connection groove 417 is provided on the outer side of the explosion-proof main body 410, and a buckle 421 is correspondingly provided on the inner side of the protective cover 420 for engaging with the connection groove 417. An adjustment bolt 423 is provided through the protective cover 420 corresponding to the position of the buckle 421. The adjustment bolt 423 is connected to the buckle 421 through a spring member 422. The protective cover 420 and the explosion-proof main body 410 are quickly installed through the connection groove 417 and the buckle 421, while ensuring the stability of the installation. Rotating the adjustment bolt 423 inward can compress the spring member 422. Compressing the spring member 422 can increase the pressure on the buckle 421 and improve the fastening between the buckle 421 and the connection groove 417. Rotating the adjustment bolt 423 outward can stretch the spring member 422. Stretching the spring member 422 can pull the buckle 421 outward, thereby separating the buckle 421 from the connection groove 417 and facilitating the disassembly of the protective cover 420 and the explosion-proof main body 410. It can be understood that a sealing member is provided between the buckle 421 and the connection groove 417. The sealing member can ensure the sealing between the buckle 421 and the connection groove 417 when they are connected, preventing gas from escaping.

[0048] Moreover, to ensure the sealing performance of the connection between the explosion-proof valve 400 and the branch pipeline 320, a sealing groove 431 is provided at the connection end of the guide cover 430 and the branch pipeline 320. A sealing member is installed in the sealing groove 431 to seal the connection between the guide cover 430 and the branch pipeline 320. The sealing groove 431 and the sealing member cooperate with each other to improve the connection sealing performance between the guide cover 430 and the branch pipeline 320, prevent gas leakage when the gas is exported, and avoid the leaked gas from affecting other components inside the lithium battery energy storage system 100. It should be noted that in addition to the sealing ring provided inside, the sealing member also includes a high-temperature resistant locking tie provided outside the connection between the explosion-proof valve 400 and the branch pipeline 320, etc.

[0049] It can be understood that the axial length of the protective cover 420 is greater than the movement stroke of the explosion-proof sheet 415. The axial length of the protective cover 420 is relatively larger, providing sufficient space for the movement stroke of the explosion-proof sheet 415 to be completed entirely, enabling the explosion-proof sheet 415 to be fully pushed open by the valve core 412 and improving the pressure relief efficiency.

[0050] In some embodiments of the present application, the exhaust and smoke exhaust pipeline 300 needs to meet the requirements of high temperature resistance and heat insulation, such as Figure 8 As shown, the exhaust and smoke exhaust pipeline 300 is a composite structure, including a diversion layer 301, a heat insulation layer 302, and a support layer 303 from the inside to the outside. Specifically, the diversion layer 301 is a thin-walled pipeline processed from iron, aiming to divert gas and withstand high temperatures; the heat insulation layer 302 is an aerogel layer, aiming to insulate heat and inhibit the transfer of heat to the outer layer; the outermost support layer 303 is processed from engineering plastic or alloy aluminum, aiming to support the structure and shape of the exhaust pipeline. Generally speaking, the composite pipeline has the characteristics of lightweight and high temperature resistance compared with traditional metal pipelines.

[0051] Furthermore, the management system further includes an exhaust and smoke exhaust power device, which can accelerate the discharge of gas from the pipeline. Specifically, the exhaust and smoke exhaust power device includes a power element, a control unit, and a sensor. The power element is connected to the control unit, and the control unit is electrically connected to the sensor; the power element is connected to the exhaust and smoke exhaust pipeline 300, and the sensor is arranged inside the battery pack 200. The power element uses an exhaust fan, and the sensor can be used to monitor the temperature rise, pressure change situation inside the battery pack 200, and the opening situation of the explosion-proof valve 400. The exhaust fan is connected to the control unit, and according to the sensor information, the exhaust fan is turned on or off, and the opening gear of the exhaust fan is controlled according to the sensor information.

[0052] It should be noted that the fan blades and the main shaft of the exhaust fan are made of heat-resistant materials and designed as a small hub ratio exhaust fan, which has the characteristics of low energy consumption and large displacement. The sensing wires and power supply wires of the exhaust fan control unit are arranged inside the support member that supports the fan hub to prevent the sensing wire harness and the power supply wire harness from being melted by high-temperature gas. The outer layers of the exhaust fan sensing wire harness and the power supply wire harness are wrapped with insulating and heat-resistant materials.

[0053] It can be understood that, as Figure 1 shown, a dust-proof structure 110 is provided at one end of the output pipeline 330 located outside the lithium battery energy storage system 100, and the dust-proof structure 110 is installed on the outer side of the lithium battery energy storage system 100. The dust-proof structure 110 can prevent dust from entering the exhaust and smoke exhaust pipeline 300, avoid dust blocking the output pipeline 330, and can also prevent dust from damaging other components after entering the pipeline. The dust-proof structure 110 can be a filter structure or a dust-proof cover structure. When exhausting, the gas can pass through the filter and be discharged or the gas can rush out of the dust-proof cover and be discharged.

[0054] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0056] The protection scope of the present invention is only defined by the claims. Benefiting from the teachings of the present invention, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A thermal safety management system for a lithium - ion energy storage cabinet, comprising a lithium - ion energy storage system (100); It is characterized in that A number of battery packs (200) are arranged inside the lithium - ion energy storage system (100). A number of lithium - ion battery cells are arranged inside each battery pack (200). Each battery pack (200) is connected to an exhaust and smoke - discharging pipeline (300). The exhaust and smoke - discharging pipeline (300) includes a main pipeline (310), a number of branch pipelines (320) and an output pipeline (330). One end of the branch pipeline (320) communicates with the main pipeline (310), and the other end is connected to the battery pack (200) through an explosion - proof valve (400). One end of the output pipeline (330) communicates with the main pipeline (310), and the other end communicates with the outside of the lithium - ion energy storage system (100).

2. The thermal safety management system for a lithium battery energy storage cabinet according to claim 1, wherein The explosion - proof valve (400) includes an explosion - proof body (410). The explosion - proof body (410) is installed on the outer surface of the battery pack (200) through a fixed bracket (440). The explosion - proof body (410) includes a valve pipe (411) which extends into the interior of the battery pack (200). On one side of the explosion - proof body (410) opposite to the valve pipe (411), there is a protective cover (420). The protective cover (420) is connected to a guiding cover (430), and the guiding cover (430) is connected to the branch pipeline (320).

3. The thermal safety management system for a lithium battery energy storage cabinet according to claim 2, wherein, The explosion - proof body (410) includes a ring body (416). An explosion - proof sheet (415) is arranged between the ring body (416) and the protective cover (420). A valve core (412) is arranged inside the valve pipe (411), and the valve core (412) is used to push open the explosion - proof sheet (415).

4. The thermal safety management system for a lithium battery energy storage cabinet according to claim 3, wherein, The valve core (412) is movably connected to the valve pipe (411), and a support spring (414) is arranged between them. A blind hole (413) is arranged at one end of the valve core (412) facing the inner side of the battery pack (200).

5. The thermal safety management system for a lithium battery energy storage cabinet according to claim 2, wherein, A connection groove (417) is arranged on the outer side of the explosion - proof body (410). A buckle (421) is correspondingly arranged on the inner side of the protective cover (420) for engaging with the connection groove (417). An adjustment bolt (423) is arranged through the protective cover (420) corresponding to the position of the buckle (421). The adjustment bolt (423) is connected to the buckle (421) through a spring member (422).

6. The thermal safety management system for a lithium battery energy storage cabinet according to claim 2, wherein A sealing groove (431) is arranged at the connection end of the guiding cover (430) and the branch pipeline (320). A sealing member is installed in the sealing groove (431) to seal the connection between the guiding cover (430) and the branch pipeline (320).

7. The thermal safety management system for a lithium battery energy storage cabinet according to claim 3, wherein The axial length of the protective cover (420) is greater than the movement stroke of the explosion - proof sheet (415).

8. The thermal safety management system for a lithium battery energy storage cabinet according to claim 1, wherein The exhaust and smoke - discharging pipeline (300) is a composite structure, which includes a diversion layer (301), a heat - insulation layer (302) and a support layer (303) from the inside to the outside.

9. The thermal safety management system for a lithium battery energy storage cabinet according to claim 1, wherein It also includes an exhaust and smoke - discharging power device. The exhaust and smoke - discharging power device includes a power element, a control unit and a sensor. The power element is connected to the control unit, and the control unit is electrically connected to the sensor. The power element is connected to the exhaust and smoke - discharging pipeline (300), and the sensor is arranged inside the battery pack (200).

10. A thermal safety management system for a lithium battery energy storage cabinet according to claim 1, characterized in that, One end of the output pipeline (330) located outside the lithium battery energy storage system (100) is provided with a dust-proof structure (110), and the dust-proof structure (110) is installed on the outer side of the lithium battery energy storage system (100).

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