Fire fighting system and energy storage system

Abstract

The invention discloses a fire extinguishing system and an energy storage system. The fire extinguishing system comprises a closed cabin, a circulating system and a supply system. The closed cabin body is used for accommodating at least one energy storage unit; the circulating system comprises a circulating pipeline and a gas driving assembly, and the two ends of the circulating pipeline are communicated with the closed cabin to form a gas circulating loop; the gas driving assembly is arranged in the gas circulation loop; and the flame-retardant gas supply system is connected with the circulating system. According to the scheme, the risk of fire blast in the closed cabin body can be reduced.

Description

Fire protection system and energy storage system

[0001]

Cross-reference

[0002] This application claims priority to the international patent application entitled “Fire Protection System and Energy Storage System” filed with the Patent Office of China on January 26, 2023, with application number PCT / CN2023 / 073480, the entire contents of which are incorporated herein by reference.

Technical field

[0003] The present application relates to the field of energy storage, and in particular to a fire protection system and an energy storage system. [Background Technology]

[0004] Energy storage refers to the process of storing energy through a medium or device and releasing it when needed. As battery explosions continue to increase, existing battery firefighting technology still faces many problems and deficiencies in the practical application of energy storage power stations. These include the use of fire extinguishing agents only after a fire or explosion has occurred. However, existing fire extinguishing agents often have difficulty extinguishing fires directly and are prone to reignition even after extinguishing them.

[0005] [Summary of the invention]

[0006] In view of the above problems, the present application provides at least one fire-fighting system and an energy storage system, which can reduce the risk of combustion and explosion inside the cabin.

[0007] This application provides a firefighting system comprising: a sealed cabin, a circulation system, and a flame-retardant gas supply system. The sealed cabin is used to accommodate at least one energy storage unit; the circulation system includes a circulation pipeline and a gas drive assembly, with both ends of the circulation pipeline connected to the sealed cabin to form a gas circulation loop; the gas drive assembly is disposed in the gas circulation loop; and the flame-retardant gas supply system is connected to the circulation system.

[0008] In the above scheme, the circulation system cooperates with the closed cabin to form a gas circulation loop, and then provides flame-retardant gas to the gas circulation loop through the flame-retardant gas supply system, so that the energy storage unit is in normal working condition. The gas drive component drives the flame-retardant gas to circulate in the gas circulation loop, reducing the oxygen concentration in the closed cabin, making it less likely for fire, explosion and other incidents to occur in the closed cabin.

[0009] In some embodiments, the fire protection system includes a discharge pipeline and a first valve, one end of the discharge pipeline is connected to the closed cabin, and the first valve is arranged in the circulation pipeline and / or the discharge pipeline.

[0010] In the above solution, by providing an emission control system and a first valve, when the first valve is installed on the circulation pipeline, it is convenient to disconnect the gas circulation loop in the event of thermal runaway of the energy storage unit, reducing the possibility of thermal runaway gas being recirculated into the cabin. When the first valve is installed on the emission pipeline, it is convenient for the gas drive assembly to drive the thermal runaway gas in the closed cabin through the first valve and out of the emission pipeline in the event of thermal runaway of the energy storage unit, thus achieving a smoke exhaust effect.

[0011] In some embodiments, the circulation system further includes a controller and a gas sensor disposed in the circulation pipeline, and the controller is connected to the gas sensor and the first valve.

[0012] In the above solution, by arranging the gas sensor in the circulation pipeline rather than in the sealed cabin, the electrical interference to the gas sensor can be reduced, so that the detection result is more accurate.

[0013] In some embodiments, the first valve is a multi-way valve, two ends of which are connected to the circulation pipeline to form a gas circulation loop, and one end of which is connected to the exhaust pipeline.

[0014] In the above solution, by providing a first valve in the circulation line and connecting it to the exhaust line, it is possible to facilitate the discharge of thermally runaway gases into the gas circulation loop and into a designated area through the exhaust line when the energy storage unit is in thermal runaway, thus achieving a smoke exhaust effect. This also facilitates disconnecting the circulation line from the exhaust line when the energy storage unit is in normal operation, preventing the flammable gases in the gas circulation loop from being discharged through the exhaust line.

[0015] In some embodiments, the fire protection system includes a second valve, the first valve is arranged on the circulation pipeline, one end of the second valve is connected to the cabin, and the other end of the second valve is connected to the discharge pipeline.

[0016] In the above solution, two valves are used to control the circulation pipeline and the discharge pipeline respectively, so as to prevent the circulation pipeline and the discharge pipeline from being out of control after one of the valves breaks down.

[0017] In some embodiments, the circulation system further includes a controller and a gas sensor arranged in the circulation pipeline, the gas sensor detects the content of thermal runaway gas in the circulation pipeline, and the controller determines whether the energy storage unit is in a normal working state or a thermal runaway state based on the content of the thermal runaway gas, wherein, when the energy storage unit is in a normal working state, the circulation pipeline and the closed cabin are in a conductive state, and / or when the energy storage unit is in a thermal runaway state, the discharge pipeline and the closed cabin are in a conductive state.

[0018] In the above scheme, in some embodiments, the circulation pipeline includes a first pipeline and a second pipeline arranged at both ends of the first valve, one end of the first pipeline and the second pipeline is connected through the first valve, the other end of the first pipeline is connected to the closed cabin, and the other end of the second pipeline is connected to the closed cabin.

[0019] In the above solution, by disconnecting the first pipeline and the second pipeline when the energy storage unit is in a thermal runaway state, it is possible to prevent the flame-retardant gas in the gas circulation loop from entering the sealed cabin through the second pipeline.

[0020] In some embodiments, there are multiple sealed cabins, one end of each sealed cabin is connected to the first pipeline, and the other end of each sealed cabin is connected to the second pipeline.

[0021] In the above solution, a plurality of closed cabins are provided, and each closed cabin is in a gas circulation loop, thereby facilitating the management of the plurality of closed cabins.

[0022] In some embodiments, each sealed cabin is placed in a single layer or at least some of the sealed cabins are stacked.

[0023] In the above solution, the voltages for single-layer placement and stacked placement may be different, that is, the fire protection system provided by this solution can be applied to high-voltage direct-hanging scenarios or other non-high-voltage direct-hanging scenarios.

[0024] In some embodiments, the gas drive assembly includes a blower disposed in the first pipeline.

[0025] In the above solution, by arranging a fan in the first pipeline, the gas can be driven to continue to flow along the gas circulation loop after passing through the first valve, and / or the gas in the closed cabin can be driven to be discharged to a designated area along the exhaust pipeline.

[0026] In some embodiments, the gas drive assembly includes an exhaust fan located on the exhaust line.

[0027] In the above solution, by providing a smoke exhaust fan, the exhaust efficiency of gas from the exhaust pipeline can be improved.

[0028] In some embodiments, a combustible medium filter assembly is provided in the circulation line.

[0029] In the above solution, by arranging a combustible medium filter assembly in the circulation pipeline, the combustible medium in the pipeline can be filtered, further preventing the combustible medium from flowing back into the cavity.

[0030] In some embodiments, the flame retardant gas supply system includes a flame retardant gas supply source and a third valve, wherein the third valve connects the gas circulation loop and the flame retardant gas supply source.

[0031] In the above solution, by providing a flame retardant gas supply source and a third valve in the flame retardant gas supply system, the flame retardant gas supply source can be conveniently controlled by the third valve to supply flame retardant gas to the gas circulation loop or stop supplying flame retardant gas to the gas circulation loop.

[0032] In some embodiments, the third valve controls the flame-retardant gas supply source to provide flame-retardant gas to the gas circulation loop when the pressure in the gas circulation loop is less than or equal to a preset pressure threshold, or the third valve controls the flame-retardant gas supply source to provide flame-retardant gas to the gas circulation loop once at preset time intervals so that the pressure in the gas circulation loop is greater than the preset pressure threshold, or the third valve controls the flame-retardant gas supply source to provide flame-retardant gas to the gas circulation loop when the oxygen content in the gas circulation loop is greater than or equal to a preset oxygen content.

[0033] In the above scheme, by setting the third valve and the flame-retardant gas supply source, the third valve can be opened when the pressure in the gas circulation loop is less than or equal to the preset pressure threshold, so that the flame-retardant gas supply source can provide flame-retardant gas to the gas circulation loop; or, the flame-retardant gas supply source is controlled to provide flame-retardant gas once every period of time, so as to facilitate gas replenishment of the gas circulation loop; or, when the oxygen content rises, the flame-retardant gas is replenished to the gas circulation loop in time, so as to facilitate the dilution of oxygen in the gas circulation loop.

[0034] In some embodiments, the preset pressure threshold is higher than the ambient pressure outside the gas circulation loop.

[0035] In the above solution, the gas circulation loop maintains a positive pressure relative to the ambient pressure outside the circulation loop, so that the gas outside the circulation loop cannot flow into the gas circulation loop due to the pressure difference, and the oxygen concentration in the gas circulation loop can be kept at a low level.

[0036] In some embodiments, the oxygen content in the sealed cabin is less than or equal to a preset ignition content.

[0037] In the above solution, the oxygen content in the sealed cabin is less than or equal to the preset ignition content, so that it is difficult for a combustion and explosion event to occur after a thermal runaway event occurs in the energy storage unit.

[0038] In some embodiments, the third valve is a differential pressure control valve.

[0039] In the above solution, the pressure is physically measured by using a pressure differential control valve, which eliminates the need for sensor detection and signal transmission, resulting in a faster response speed.

[0040] In some embodiments, the third valve is an electrically controlled valve, the circulation system includes a pressure detection element disposed in the gas circulation loop, and the pressure detection element and the third valve are connected to a controller.

[0041] In the above scheme, by setting up a pressure detection element and a controller, the controller controls the opening or closing of the third valve according to the pressure in the gas circulation loop, making it convenient for the third valve to transport the flame-retardant gas provided by the flame-retardant gas supply source into the gas circulation loop or stop transporting it to the gas circulation loop.

[0042] In some embodiments, the flame retardant gas supply system further includes a gas generator for producing flame retardant gas, and the gas generator is connected to the flame retardant gas supply source.

[0043] In the above solution, by providing a gas generator, the flame retardant gas supply source can be replenished in time when the amount of flame retardant gas in the flame retardant gas supply source decreases.

[0044] In some embodiments, a buffer component for storing flame-retardant gas is provided in the circulation pipeline, and the buffer component is connected to the third valve.

[0045] In the above solution, by providing a buffer, it can be used to temporarily store the flame-retardant gas in the pipeline.

[0046] In some embodiments, the fire protection system includes a cooling system, which includes a fire extinguishing agent supply source and a fourth valve. The fourth valve connects the enclosed cabin and the fire extinguishing agent supply source and is connected to the controller.

[0047] In the above solution, by providing a cooling system, the closed cabin can be further cooled to reduce heat transfer when a fire occurs inside the closed cabin.

[0048] In some embodiments, the circulation loop runs through a relatively independent equipment room and a valve hall, a closed cabin is placed in the valve hall, and target devices in the fire protection system are placed in the equipment room. The target devices include the controller and gas sensor in the circulation system and / or the flame-retardant gas supply source in the flame-retardant gas supply system.

[0049] In the above scheme, by placing target devices such as the controller, gas sensor and / or flame retardant gas supply source in the flame retardant gas supply system in the equipment room, the interference of electrical equipment in the valve hall on the target devices can be reduced, and the maintenance of the flame retardant gas supply system is also convenient.

[0050] In some embodiments, the fire protection system includes a discharge pipe, one end of which is connected to the closed cabin, and the other end of which is connected to the outside of the valve hall.

[0051] In the above solution, the risk of fire and explosion in the valve hall can be reduced by discharging the gas to the outside of the valve hall through the exhaust pipeline.

[0052] The present application provides an energy storage system, comprising the above-mentioned fire protection system and at least one energy storage unit.

[0053] In the above scheme, the circulation system cooperates with the closed cabin to form a gas circulation loop, and then provides flame-retardant gas to the gas circulation loop through the flame-retardant gas supply system, so that the energy storage unit is in normal working condition. The gas drive component drives the flame-retardant gas to circulate in the gas circulation loop, reducing the oxygen concentration in the closed cabin, making it less likely for fire, explosion and other incidents to occur in the closed cabin.

[0054] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

Brief Description of the Drawings

[0055] The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application.

[0056] FIG1 is a structural diagram of an energy storage system according to one or more embodiments;

[0057] FIG2 is a second structural diagram of an energy storage system according to one or more embodiments;

[0058] FIG3 is a third structural diagram of an energy storage system according to one or more embodiments;

[0059] FIG4 is a first schematic diagram of the connection between the circulation system and a plurality of sealed cabins in a fire protection system according to one or more embodiments;

[0060] FIG5 is a second schematic diagram of the connection between the circulation system and a plurality of sealed cabins in a fire protection system according to one or more embodiments.

[0061] Reference numerals:

[0062] 1-Energy storage system, 10-Firefighting system, 20-Energy storage unit, 11-Enclosed cabin, 12-Circulation system, 13-Flame-retardant gas supply system, 131-Third valve, 132-Flame-retardant gas supply source, 133-Gas generator, 121-First valve, 122-Circulation pipeline, 123-Discharge pipeline, 124-Controller, 125-Gas sensor, 1221-First pipeline, 1222-Second pipeline, 126-Combustible medium filter assembly, 127-Gas drive assembly, 1271-Fan, 128-Buffer, 1272-Smoke exhaust fan, 14-Cooling system, 141-Fire extinguishing agent supply source, 142-Fourth valve, a-Equipment room, b-Valve hall, 1231-Second valve, 129-Pressure detection component. [Specific implementation method]

[0063] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0064] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0065] The term "and / or" in this article is simply a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0066] The inventors of this solution have discovered that, in current energy storage power plants, fire extinguishing agents are used only after a fire or explosion occurs. However, these extinguishing agents often struggle to extinguish fires directly and can easily reignite even after extinguishing them. To address this issue, the inventors have discovered that it would be best to directly eliminate the combustion aids that contribute to the three elements of combustion, effectively reducing the risk of fires caused by the mixing of battery thermal runaway gases and air. For a specific solution, please refer to the following examples.

[0067] Referring to FIG. 1 , the energy storage system 1 provided in this embodiment includes a fire protection system 10 and at least one energy storage unit 20 .

[0068] The energy storage system 1 can be a high-voltage direct-mount energy storage system 1 or a traditional non-high-voltage direct-mount energy storage system 1. The structure of the fire protection system 10 is described in detail in the embodiment of the fire protection system 10 below and will not be further elaborated here. The energy storage unit 20 can be a device capable of storing energy. For example, the energy storage unit 20 can be an electrical box composed of one or more batteries. High-voltage direct-mount energy storage systems integrate VSC (voltage source converter) valves with DC energy storage valves, offering advantages such as high modularity, low system network losses, good economic benefits, and high operational reliability. Compared to traditional energy storage technologies, new high-voltage DC direct-mount energy storage systems offer higher voltage levels, greater capacity, and stronger grid regulation and support capabilities. Lithium-ion batteries are widely used in electrochemical energy storage systems due to their high energy density, long cycle life, fast response time, and low self-discharge. However, lithium-ion batteries are highly susceptible to thermal runaway under conditions such as short circuits, overcharge and overdischarge, mechanical abuse, and thermal abuse. Thermal runaway of lithium-ion batteries can produce flammable or toxic gases such as H2, hydrocarbons, and CO. Due to the high voltage level of high-voltage energy storage valves, partial discharges are prone to occur, generating sparks. If the battery thermal runaway gases reach a certain concentration within the valve chamber, large-scale fires or even explosions can occur. Therefore, applying this solution to high-voltage direct-mounted energy storage systems can significantly reduce the probability of explosions.

[0069] In the above scheme, the circulation system 12 cooperates with the closed cabin 11 to form a gas circulation loop, and then provides flame-retardant gas to the gas circulation loop through the flame-retardant gas supply system 13, so that the energy storage unit 20 is in normal working condition, circulates flame-retardant gas in the gas circulation loop, reduces the oxygen concentration in the closed cabin 11, and makes it less likely for fire, explosion and other incidents to occur in the closed cabin 11.

[0070] As shown in Figures 1 and 2, the present application provides a fire protection system 10 comprising: a sealed cabin 11, a circulation system 12, and a flame-retardant gas supply system 13. Sealed cabin 11 is configured to house at least one energy storage unit 20. Circulation system 12 includes a circulation pipeline 122 and a gas drive assembly 127. Both ends of circulation pipeline 122 communicate with sealed cabin 11 to form a gas circulation loop, and gas drive assembly 127 is disposed within the gas circulation loop. Flame-retardant gas supply system 13 is connected to circulation system 12.

[0071] The sealed cabin 11 is used to house the energy storage unit 20. The better the sealing performance of the sealed cabin 11, the less likely gas outside the sealed cabin 11 will flow from the sealed cabin 11 into the gas circulation loop. The sealed cabin 11 can specifically be a cabin with good sealing performance. The sealed cabin 11 can be an electrical cabinet or other device capable of housing the energy storage unit 20. For example, the sealed cabin 11 can be a box for temporarily placing the energy storage unit. The specific form of the sealed cabin 11 is not specifically limited here. The at least one can be one or more than one, such as two or three. The energy storage unit 20 can be a device capable of storing energy. For example, the energy storage unit 20 can be an electrical box composed of one or more batteries. The circulation pipeline 122 cooperates with the sealed cabin 11 to form a gas circulation loop, and specifically, the sealed cabin 11 can be a component of the gas circulation loop. The flame-retardant gas supply system 13 is connected to the circulation system 12 to provide flame-retardant gas to the gas circulation loop. The flame-retardant gas can be any inert gas or other gas that is not conducive to combustion. This embodiment takes the flame-retardant gas as nitrogen as an example. The flame-retardant gas can circulate in the circulation loop, that is, the flame-retardant gas can circulate in the circulation loop after being provided to the circulation loop by the flame-retardant gas supply system 13. The gas drive component 127 is arranged in the gas circulation loop to drive the gas flow in the gas circulation loop. The gas drive component 127 is arranged in the gas circulation loop, specifically, it can be arranged in the circulation system 12 or in the closed cabin 11. Exemplarily, the gas drive component 127 is arranged in the circulation pipeline 122. In some application scenarios, when the energy storage unit 20 is in normal working condition, the gas drive component 127 drives the gas flow in the gas circulation loop.

[0072] In the above scheme, the circulation system 12 cooperates with the sealed cabin 11 to form a gas circulation loop. The flame-retardant gas supply system 13 then supplies flame-retardant gas to the gas circulation loop. This facilitates the normal operation of the energy storage unit 20, allowing the flame-retardant gas to circulate in the gas circulation loop, reducing the oxygen concentration within the sealed cabin 11 and making it less likely to cause fires, explosions, and other incidents within the sealed cabin 11. Furthermore, when the energy storage unit 20 is in a thermal runaway state, the thermally runaway gas in the sealed cabin 11 can enter the gas circulation loop, and the circulation system 12 can then discharge the gas in the gas circulation loop to a designated area, achieving a smoke exhaust effect.

[0073] In some embodiments, the fire protection system includes a discharge pipeline 123 and a first valve 121 . One end of the discharge pipeline 123 is connected to the sealed cabin 11 , and the first valve 121 is disposed on the circulation pipeline 122 and / or the discharge pipeline 123 .

[0074] The other end of the discharge pipe 123 extends to a designated area outside the closed cabin 11. In some application scenarios, the designated area may be an area outside the valve hall, where the valve hall refers to the space where the closed cabin 11 is placed. For example, the other end of the discharge pipe 123 is connected to the outside of the valve hall. The first valve 121 is arranged in the pipeline to control the conduction or disconnection of the pipeline, and can also control the flow rate flowing through the first valve 121. The first valve 121 is arranged in the circulation pipeline 122 and / or the discharge pipeline 123. Specifically, it can be arranged in the circulation pipeline 122, or in the discharge pipeline 123, or in both the circulation pipeline 122 and the discharge pipeline 123. Among them, the gas drive component 127 is arranged in the gas circulation loop to drive the gas flow of the gas circulation loop, and / or drive the gas in the closed cabin 11 to be discharged to the designated area along the discharge pipeline 123. In some application scenarios, when the energy storage unit 20 is in a thermal runaway state, the gas drive component 127 drives the gas in the closed cabin 11 to be discharged to a designated area along the exhaust pipe 123. In some application scenarios, the gas drive component 127 drives the gas flow of at least part of the gas circulation loop, and drives at least part of the gas in the closed cabin 11 to be discharged to a designated area along the exhaust pipe 123. In some application scenarios, if the energy storage system is a high-voltage direct-hung energy storage system, due to the high voltage level of the valve hall in the high-voltage energy storage system, local discharge is prone to occur, generating sparks. If the battery thermal runaway gas reaches a certain concentration in the valve hall, a large-scale fire or even an explosion will occur. Therefore, the designated area can be set in an area outside the valve hall to reduce the risk of fire or explosion in the valve hall.

[0075] In the above solution, by providing the discharge management system 123 and the first valve 121, when the first valve 121 is located on the circulation line 122, it is convenient for the energy storage unit 20 to enter a thermal runaway state by disconnecting the gas circulation loop 122 and reducing the possibility of recirculating the thermal runaway gas into the cabin 11. When the first valve 121 is located on the discharge line 123, it is convenient for the energy storage unit to enter a thermal runaway state. The gas drive assembly 127 drives the thermal runaway gas in the sealed cabin 11 through the first valve 121 and discharges it from the discharge line 123 to a designated area, thus achieving a smoke exhaust effect.

[0076] In some embodiments, the circulation system 12 further includes a controller 124 and a gas sensor 125 disposed in the circulation pipeline. The controller 124 is connected to the gas sensor 125 and the first valve 121 .

[0077] The gas sensor 125 detects the level of thermal runaway gas in the circulation line 122, and the controller 124 controls the first valve 121 based on the level of thermal runaway gas. The gas sensor 125 detects the level of thermal runaway gas in the circulation line 122, and the controller 124 determines whether the energy storage unit 20 is in normal operation or in a thermal runaway state based on the level of thermal runaway gas. When the energy storage unit 20 is in normal operation, the circulation line 122 and the sealed cabin 11 are in a conductive state. When the energy storage unit 20 is in a thermal runaway state, the discharge line 123 and the sealed cabin 11 are in a conductive state. For example, the gas sensor 125 may be a fire detector. By placing the gas sensor 125 in the circulation line 122, it can detect the level of thermal runaway gas in the circulation line 122. Based on the detection result of the gas sensor 125, the controller 124 can determine whether the energy storage unit 20 is in normal operation or in a thermal runaway state. The controller 124 may include a control chip, which may be provided in a separate device, for example, a computer device. Alternatively, the controller 124 may be composed of a plurality of discrete control units (not shown). The specific form of the controller 124 is not specifically limited herein. The number of gas sensors 125 may be multiple, and the controller 124 determines the state of the energy storage unit 20 based on the detection results of the plurality of gas sensors 125.

[0078] In the above solution, by arranging the gas sensor 125 in the circulation pipeline 122 rather than in the sealed cabin 11 , the electrical interference to the gas sensor 125 can be reduced, so that the detection result is more accurate.

[0079] As shown in FIG2 , in some embodiments, the first valve 121 is a multi-way valve, with two ends of the first valve 121 connected to the circulation pipeline 122 and one end connected to the discharge pipeline 123 .

[0080] The first valve 121 can be a three-way valve, a five-way valve, or a multi-way valve with other numbers of channels. Optionally, the first valve 121 controls the connection between the circulation pipeline 122 and the discharge pipeline 123 to be disconnected when the energy storage unit 20 is in a normal working state, and controls the connection between the circulation pipeline 122 and the discharge pipeline 123 to be established when the energy storage unit 20 is in a thermal runaway state. Normal working state refers to the state of the energy storage unit 20 except the thermal runaway state. Thermal runaway of the energy storage unit 20 refers to the cumulative enhancement of the current and the temperature of the energy storage unit 20 during constant voltage charging and gradual damage.

[0081] In the above solution, first valve 121 is connected to circulation line 122 and exhaust line 123, respectively. This allows thermal runaway gas to enter the gas circulation loop when energy storage unit 20 is in a thermal runaway state. The gas is then discharged to a designated area through exhaust line 123, achieving a smoke exhaust effect. This also facilitates disconnecting circulation line 122 and exhaust line 123 when energy storage unit 20 is in normal operation, preventing flame-retardant gas in the gas circulation loop from being discharged through exhaust line 123.

[0082] As shown in FIG3 , in some embodiments, the fire protection system 10 further includes a second valve 1231. The first valve 121 is disposed on the circulation line 122. One end of the second valve 1231 is connected to the cabin 11, and the other end is connected to the discharge line 123.

[0083] That is, the discharge line 123 is connected to the sealed cabin 11 through the second valve 1231. Optionally, the first valve and the second valve 1231 are independent and do not affect each other. The two valves can be controlled by the same control module or separately controlled by different control modules. In some application scenarios, the valve provided on the circulation line 122 controls the connection between the circulation line 122 and the discharge line 123 to be disconnected when the energy storage unit 20 is in normal working condition. The valve connected to the discharge line 123 controls the connection between the circulation line 122 and the discharge line 123 to be established when the energy storage unit 20 is in a thermal runaway state.

[0084] In the above solution, two valves are used to control the circulation pipeline 122 and the discharge pipeline 123 respectively, so as to prevent the circulation pipeline 122 and the discharge pipeline 123 from being out of control after one of the valves breaks down.

[0085] In some embodiments, the circulation line 122 includes a first line 1221 and a second line 1222 disposed at both ends of the first valve 121. One end of the first line 1221 and the second line 1222 are connected through the first valve 121, and the other end of the first line 1221 is connected to the sealed cabin 11. The other end of the second line 1222 is connected to the sealed cabin 11.

[0086] That is, one end of the first pipeline 1221 is connected to the first valve 121, and the other end is connected to the sealed cabin 11. The second pipeline 1222 is connected to the first valve 121 at one end, and the other end is connected to the sealed cabin 11. The first valve 121 controls the disconnection between the second pipeline 1222 and the first pipeline 1221 when the energy storage unit 20 is in thermal runaway. The first valve 121 controls the disconnection or connection between the discharge pipeline 123 and the circulation pipeline 122, which can be achieved by disconnecting the discharge pipeline 123 from the first pipeline 1221 or establishing a connection between the discharge pipeline 123 and the circulation pipeline 122. The first valve 121 is disposed between the first pipeline 1221 and the second pipeline 1222. It can disconnect the first pipeline 1221 and the second pipeline 1222 when the energy storage unit 20 is in thermal runaway, and establish the connection between the first pipeline 1221 and the second pipeline 1222 when the energy storage unit 20 is in normal operation. After the energy storage unit 20 has been in the thermal runaway state for a certain period of time, if the gas sensor 125 detects that the content of the thermal runaway gas in the circulation pipeline 122 has dropped to a lower, safe value, the controller 124 determines that the energy storage unit 20 has switched from the thermal runaway state to the normal operating state. The gas circulation in the gas circulation loop can flow from the second pipeline 1222 to the sealed cabin 11, then from the sealed cabin 11 to the first pipeline 1221, and then through the first valve 121 to the second pipeline 1222, forming a loop.

[0087] In the above solution, by disconnecting the first pipeline 1221 and the second pipeline 1222 when the energy storage unit 20 is in a thermal runaway state, the flame-retardant gas in the gas circulation loop can be prevented from entering the sealed cabin 11 from the second pipeline 1222 .

[0088] In some embodiments, there are multiple sealed cabins 11 , and one end of each sealed cabin 11 is connected to the first pipeline 1221 , and the other end of each sealed cabin 11 is connected to the second pipeline 1222 .

[0089] The plurality of pods can be two or more. The sealed pods 11 can be arranged in a single row or overlapped. Each sealed pod 11 is connected to one end of the first pipeline 1221 and the second pipeline 1222. In some application scenarios, a diverter valve (not shown) can be provided at one end of the first pipeline 1221 and the second pipeline 1222. The diverter valve includes a converging channel and multiple branches, each branch being connected to each sealed pod 11.

[0090] In the above solution, a plurality of sealed cabins 11 are provided, and each sealed cabin 11 is located in a gas circulation loop, thereby facilitating management of the plurality of sealed cabins 11 .

[0091] In some embodiments, each sealed cabin 11 is placed in a single layer or at least some of the sealed cabins 11 are stacked.

[0092] As shown in Figures 4 and 5 , each enclosed capsule 11 in Figure 4 is arranged in a single layer, while in Figure 5 , the enclosed capsules 11 are stacked in three layers: a first layer, a middle layer, and an upper layer. In other embodiments, the enclosed capsules 11 can be stacked in other numbers. The number of stacked layers is not specifically limited herein, and the number of enclosed capsules 11 in each layer can be the same or different. The enclosed capsules 11 in Figure 4 can be arranged in a container-type or prefabricated cabin-type configuration, while the enclosed capsules 11 in Figure 5 can be arranged in a valve tower-type configuration. For example, frames for accommodating enclosed capsules 11 (e.g., electrical cabinets) in the valve hall are arranged in multiple layers, with at least one enclosed capsule 11 placed in each frame layer, thereby achieving a stacked arrangement of the enclosed capsules 11. The connection between each layer of enclosed capsules 11 and the first and second pipelines 1221 and 1222 in Figure 5 can refer to the connection method shown in Figure 4 . Prefabricated pods are high-quality, highly reliable, and highly adaptable customized electrical equipment integration products developed in accordance with relevant national standards and specifications, based on proven outdoor container-type manufacturing technology. Containers, on the other hand, are merely temporary integrated electrical equipment products. Energy storage units in prefabricated pods and container-type systems are generally arranged in a single layer, while in valve towers, units can be stacked, for example, in three layers, with each layer containing multiple units.

[0093] In some embodiments, the gas driving assembly 127 includes a blower 1271 . The blower 1271 is disposed in the first pipeline 1221 .

[0094] Fan 1271 drives the gas in first pipeline 1221 toward first valve 121. After moving toward first valve 121, the gas in first pipeline 1221 can further move to second pipeline 1222, enclosed electrical cabinet 11, and then to first pipeline 1221 to form a cycle. Alternatively, the gas can further move to discharge pipeline 123 and be discharged to a designated area.

[0095] In the above solution, by setting a fan 1271 in the first pipeline 1221, the gas can be driven to continue to flow along the gas circulation loop after passing through the first valve 121, and / or the gas in the closed cabin 11 can be driven to be discharged to a designated area along the exhaust pipeline 123.

[0096] 2 , in some embodiments, the gas drive assembly 127 includes a smoke exhaust fan 1272 . The smoke exhaust fan 1272 is located on the exhaust pipeline 123 .

[0097] Optionally, smoke exhaust fan 1272 discharges gas from exhaust pipe 123 to a designated area in response to a preset first control signal. For example, smoke exhaust fan 1272 can be positioned on a side of exhaust pipe 123 near the designated area. Smoke exhaust fan 1272 can use suction to discharge gas from exhaust pipe 123 to the designated area. The first control signal can be generated by controller 124.

[0098] In the above solution, by providing the smoke exhaust fan 1272 , the exhaust efficiency of the gas from the exhaust pipeline 123 can be improved.

[0099] In some embodiments, a combustible medium filter assembly 126 is disposed in the first pipeline 1221 .

[0100] The combustible medium filter assembly 126 can be used to filter combustible media from the thermal runaway gases. For example, the combustible medium filter assembly 126 can be a smoke filter. The smoke filter can filter out most of the combustible media from the thermal runaway gases, thereby preventing the thermal runaway gases from circulating to other enclosed cabins 11 and posing a fire risk there if the exhaust pipeline 123 is not promptly connected and the second pipeline 1222 is not promptly disconnected.

[0101] In the above solution, by providing the combustible medium filter assembly 126 in the first pipeline 1221, the combustible medium in the pipeline can be filtered, further preventing the combustible medium from flowing back into the cavity.

[0102] In some embodiments, the flame retardant gas supply system 13 includes a flame retardant gas supply source 132 and a third valve 131 . The third valve 131 connects the gas circulation loop and the flame retardant gas supply source 132 .

[0103] The flame retardant gas supply source 132 is used to provide flame retardant gas. The flame retardant gas supply source 132 can be a device for storing or producing flame retardant gas, for example, a nitrogen tank. The third valve 131 can be an electric control valve or a pressure differential control valve.

[0104] In the above scheme, by setting a flame retardant gas supply source 132 and a third valve 131 in the flame retardant gas supply system 13, it is convenient to control the flame retardant gas supply source 132 to supply flame retardant gas to the gas circulation loop or stop supplying flame retardant gas to the gas circulation loop through the third valve 131.

[0105] In some embodiments, the flame retardant gas supply system 13 includes a flame retardant gas supply source 132 and a third valve 131. The third valve 131 connects the gas circulation loop and the flame retardant gas supply source 132. The third valve 131 controls the flame retardant gas supply source 132 to provide flame retardant gas to the gas circulation loop when the pressure in the gas circulation loop is less than or equal to a preset pressure threshold.

[0106] The preset pressure threshold can be set as needed. For example, the pressure threshold can be set to be greater than or equal to the pressure outside the gas circulation loop to prevent gas outside the gas circulation loop from flowing into the gas circulation loop. The third valve 131 can be a pressure differential control valve, or it can be a component including a sensor that can be used to measure pressure. In some application scenarios, the third valve 131 can be a pressure differential control valve, and the pressure differential control valve can be a pressure relief valve, a safety valve or a similar valve. The pressure relief valve generally measures pressure physically, and controls the connection between the flame-retardant gas supply source 132 and the circulation system 12 or disconnects the connection between the flame-retardant gas supply source 132 and the circulation system 12 through the pressure difference at both ends.

[0107] In the above scheme, by setting the third valve 131 and the flame-retardant gas supply source 132, the third valve 131 can be opened when the pressure in the gas circulation loop is less than or equal to the preset pressure threshold, so that the flame-retardant gas supply source 132 can provide flame-retardant gas to the gas circulation loop.

[0108] In some embodiments, the flame retardant gas supply system 13 includes a flame retardant gas supply source 132 and a third valve 131. The third valve 131 connects the gas circulation loop and the flame retardant gas supply source 132. The third valve 131 controls the flame retardant gas supply source 132 to provide flame retardant gas to the gas circulation loop once every preset time so that the pressure in the gas circulation loop is greater than the preset pressure threshold.

[0109] The flame-retardant gas supply source 132 is used to provide flame-retardant gas. The preset time can be determined based on the sealing performance of the sealed cabin 11 and the circulation pipeline 122. If the sealing performance is good, the preset time can be slightly extended. If the sealing performance is poor, the preset time can be slightly shortened to ensure that the pressure within the gas circulation loop is greater than a preset pressure threshold within the preset time interval. In some application scenarios, the circulation system 12 may also include a controller 124, which opens the third valve 131 at preset intervals to allow the flame-retardant gas provided by the flame-retardant gas supply source 132 to be delivered to the gas circulation loop. The preset time can be determined based on the airtightness of the sealed cabin 11. For example, if the pressure within the sealed cabin 11 drops from A to a preset pressure threshold within n hours, the preset time can be set to n hours. In other embodiments, the preset time can also be less than n hours. The method for determining the preset time is not specifically limited here.

[0110] In the above solution, the flame-retardant gas supply source is controlled to provide flame-retardant gas once every certain period of time, so as to facilitate gas replenishment to the gas circulation loop.

[0111] In some embodiments, the flame retardant gas supply system 13 includes a flame retardant gas supply source 132 and a third valve 131. The third valve 131 connects the gas circulation loop and the flame retardant gas supply source 132. The third valve 131 controls the flame retardant gas supply source 132 to provide flame retardant gas to the gas circulation loop when the oxygen content in the gas circulation loop is greater than or equal to a preset oxygen content.

[0112] The flame-retardant gas supply source 132 is used to provide flame-retardant gas with a preset oxygen content lower than a preset ignition level. For example, a sensor can be provided in the gas circulation loop to detect the oxygen content. The third valve 131 can be an electrically controlled valve. The controller 124 determines whether the third valve 131 is opened or closed upon receiving the sensor's detection result.

[0113] In the above solution, when the oxygen content rises, flame-retardant gas is promptly added to the gas circulation loop to facilitate dilution of the oxygen in the gas circulation loop.

[0114] In some embodiments, the preset pressure threshold is higher than the ambient pressure outside the gas circulation loop.

[0115] Maintaining a positive pressure relative to the ambient pressure outside the circulation loop means that the pressure within the circulation loop is greater than the ambient pressure outside the circulation loop. In other words, the flame-retardant gas supply system 13 can maintain a positive pressure within the gas circulation loop relative to the ambient pressure outside the circulation loop by providing flame-retardant gas to the gas circulation loop.

[0116] In the above scheme, the gas circulation loop maintains a positive pressure relative to the ambient pressure outside the circulation loop, so that the gas outside the circulation loop cannot flow into the gas circulation loop due to the pressure difference, and the oxygen concentration in the gas circulation loop can be kept at a low level.

[0117] In some embodiments, the oxygen content in the sealed cabin 11 is less than or equal to a preset ignition content.

[0118] For example, the preset ignition content can be less than or equal to 10%, or setting the preset ignition content lower can better reduce the probability of ignition. That is, the flame retardant gas supply system 13 can make the oxygen content in the closed cabin 11 less than or equal to the preset ignition content by providing flame retardant gas to the gas circulation loop.

[0119] In the above solution, the oxygen content in the sealed cabin 11 is less than or equal to the preset ignition content, so that it is difficult for an explosion to occur after a thermal runaway event occurs in the energy storage unit 20.

[0120] In some embodiments, the third valve 131 is a differential pressure control valve.

[0121] The differential pressure control valve may be a third valve for detecting the pressure in the gas circulation loop. For example, the differential pressure control valve may be a pressure relief valve, a pressure reducing valve, a safety valve, or a similar valve. In this embodiment, the differential pressure control valve is taken as an example of a pressure reducing valve. The pressure reducing valve generally measures pressure physically, and controls the connection between the flame retardant gas supply source 132 and the gas circulation loop or disconnects the connection between the flame retardant gas supply source 132 and the gas circulation loop based on the pressure detected by the valve. The flame retardant gas supply source 132 may be a device for storing or producing flame retardant gas, for example, the flame retardant gas supply source 132 may be a nitrogen tank.

[0122] In the above solution, the pressure is physically measured by using a pressure differential control valve, which eliminates the need for sensor detection and signal transmission, resulting in a faster response speed.

[0123] As shown in FIG3 , in some embodiments, the third valve 131 is an electrically controlled valve. The circulation system 12 includes a pressure detection element 129 disposed in the gas circulation loop. The pressure detection element 129 and the third valve 131 are connected to the controller 124 .

[0124] The pressure detecting element 129 detects the pressure in the gas circulation loop. The controller 124 is connected to the pressure detecting element 129 and the third valve 131 respectively. Optionally, in response to the pressure in the gas circulation loop being less than or equal to a preset pressure threshold, the controller 124 opens the third valve 131, wherein when the third valve 131 is opened, the flame-retardant gas supply source 132 is connected to the gas circulation loop. The pressure detecting element 129 can be a pressure sensor. The pressure detecting element 129 can be set at any position in the gas circulation loop. For example, the pressure detecting element 129 can be set in the closed cabin 11 or in the circulation system 12. Exemplarily, the pressure detecting element 129 is set in the circulation system 12. In some application scenarios, the circulation loop 122 in the circulation system 12 runs through the equipment room a and the valve hall b, and the pressure detecting element 129 can be set on the side of the circulation loop 122 in the circulation system 12 that is located in the equipment room a. When the third valve 131 is opened, the flame-retardant gas supply source 132 is connected to the gas circulation loop so as to transport the flame-retardant gas provided by the flame-retardant gas supply source 132 into the gas circulation loop.

[0125] In the above scheme, by setting the pressure detection element 129 and the controller 124, the controller 124 can open the third valve 131 when it determines that the pressure in the gas circulation loop is less than or equal to the preset pressure threshold, so that the flame retardant gas provided by the flame retardant gas supply source 132 can be delivered to the gas circulation loop.

[0126] In some embodiments, the flame retardant gas supply system 13 further includes a gas generator 133 for producing flame retardant gas. The gas generator 133 is connected to the flame retardant gas supply source 132.

[0127] The gas generator 133 generates flame retardant gas and transmits the generated flame retardant gas to the flame retardant gas supply source 132. If the flame retardant gas is nitrogen, the gas generator 133 may be a nitrogen generator.

[0128] In the above solution, by providing the gas generator 133 , the flame retardant gas supply source 132 can be replenished in time when the flame retardant gas amount in the flame retardant gas supply source 132 is reduced.

[0129] In some embodiments, a buffer 128 for storing flame-retardant gas is provided in the circulation pipeline 122. The buffer 128 is connected to the third valve assembly 131.

[0130] The buffer member 128 may be a buffer tank, which is located in the gas circulation loop and in which the gas can flow.

[0131] In the above solution, the buffer member 128 is provided to temporarily store the flame-retardant gas in the circulation pipeline 122 .

[0132] In some embodiments, the fire protection system 10 includes a cooling system 14 . The cooling system 14 includes a fire extinguishing agent supply source 141 and a fourth valve 142 . The fourth valve 142 connects the sealed cabin 11 and the fire extinguishing agent supply source 141 , and is connected to the controller 124 .

[0133] Optionally, the fourth valve 142 delivers the fire extinguishing agent in the fire extinguishing agent supply source 141 into the enclosed cabin 11 in response to a second control signal indicating that the energy storage unit is in a thermal runaway state, wherein the fire extinguishing agent is configured to at least be able to reduce the temperature within the enclosed cabin 11. The fire extinguishing agent supply source 141 provides fire extinguishing agent. The fire extinguishing agent supply source 141 can be a device for storing or producing fire extinguishing agent, for example, the fire extinguishing agent supply source 141 can be a fire extinguishing agent tank. The fourth valve 142 can specifically be a valve that can be controlled by an electrical signal, such as a solenoid valve. In some application scenarios, the fourth valve 142 is connected to the enclosed cabin 11 through the second pipeline 1222, and the fire extinguishing agent is input into the second pipeline 1222. Then, driven by the gas in the second pipeline 1222, the fire extinguishing agent is delivered into the enclosed cabin 11. For example, the controller 124 can intermittently transmit a signal to the fourth valve 142, so that the fourth valve 142 can intermittently deliver the fire extinguishing agent to the enclosed cabin 11. The fire extinguishing agent can cool the enclosed cabin 11. If a fire or other incident unfortunately occurs, the cooling system 14 can provide the fire extinguishing agent to the enclosed cabin 11 to cool the enclosed cabin 11, thereby reducing the probability of heat diffusion. The flame retardant gas supply system 13 and the cooling system 14 are configured to alternately supply flame retardant gas and fire extinguishing agent to the enclosed cabin 11 when the energy storage unit 20 is in a thermal runaway state, or they can be configured to simultaneously supply flame retardant gas and fire extinguishing agent to the enclosed cabin 11. The flame retardant gas supply system 13 providing flame retardant gas to the gas circulation loop is equivalent to providing flame retardant gas to the enclosed cabin 11.

[0134] In the above solution, by providing the cooling system 14 , when a fire occurs in the closed cabin 11 , the closed cabin 11 can be cooled to reduce heat transfer.

[0135] In some embodiments, the flame retardant gas supply system 13 and the temperature reduction system 14 are configured to alternately supply flame retardant gas and fire extinguishing agent into the sealed cabin 11 when the energy storage unit 20 is in a thermal runaway state.

[0136] Alternating the supply of flame-retardant gas and fire extinguishing agent to the enclosed cabin 11 means that when the first flame-retardant gas supply system 13 supplies flame-retardant gas to the enclosed cabin 11, the cooling system 14 stops supplying fire extinguishing agent to the enclosed cabin 11; and when the cooling system 14 supplies fire extinguishing agent to the enclosed cabin 11, the flame-retardant gas supply system 13 stops supplying flame-retardant gas to the enclosed cabin 11. In some application scenarios, the cooling system 14 has a higher priority than the flame-retardant gas supply system 13. That is, when the flame-retardant gas supply system 13 and the cooling system 14 are triggered simultaneously, the cooling system 14 first supplies fire extinguishing agent to the enclosed cabin 11. In other application scenarios, the cooling system 14 has a lower priority than the flame-retardant gas supply system 13. That is, when the flame-retardant gas supply system 13 and the cooling system 14 are triggered simultaneously, the flame-retardant gas supply system 13 first supplies flame-retardant gas to the enclosed cabin 11.

[0137] In the above solution, by alternately providing flame-retardant gas and fire extinguishing agent into the sealed cabin 11, the amount of fire extinguishing agent used can be reduced.

[0138] In some embodiments, the circulation loop 122 of the circulation system 12 passes through a relatively independent equipment room a and a valve hall b. The valve hall b houses the sealed cabin 11, while the equipment room a houses the target components of the fire protection system 10. These target components include the controller 124 and gas sensor 123 in the circulation system 12 and / or the flame-retardant gas supply source 132 in the flame-retardant gas supply system.

[0139] Among them, the flame retardant gas supply source 132 is used to provide flame retardant gas. The gas sensor 123 is used to detect the content of thermal runaway gas in the gas circulation loop, and the controller 124 determines whether the energy storage unit 20 is in a normal working state or a thermal runaway state based on the content of thermal runaway gas. Among them, all devices in the fire protection system 10 except the closed cabin 11 can be placed in the equipment room a. As shown in Figures 1 and 2, the left side is the equipment room a, and the right side is the valve hall b. Only the closed cabin 11 is placed in the valve hall b, and the sensors, controller 124, flame retardant gas supply system 13, exhaust system and cooling system 14 are all arranged in the equipment room a for easy maintenance. Because the sensors and controller 124 are arranged in the equipment room a, they can be powered by AC power.

[0140] In the above solution, by placing the components of the fire protection system 10 except the enclosed cabin 11 in the equipment room a, that is, the flame retardant gas supply system 13 is arranged in the equipment room a, the maintenance of the flame retardant gas supply system 13 is convenient.

[0141] In some embodiments, the fire protection system 10 includes a discharge pipe 123 , one end of which is connected to the closed cabin 11 , and the other end of which is connected to the outside of the valve hall b.

[0142] For example, the other end of the discharge pipe 123 may also be located outside the equipment room a and outside the valve hall b at the same time.

[0143] In the above solution, by discharging the gas to the outside of the valve hall b, the risk of fire and explosion in the valve hall b can be reduced.

[0144] In some applications, the sealed cabin 11 is an electrical cabinet, and the first valve 121 is a three-way fire valve. One end of the first valve 121 is connected to a first pipeline 1221, another end is connected to a second pipeline 1222, and a third end is connected to an exhaust pipeline 123. The energy storage unit 20 contained within the electrical cabinet is a battery module. The cabinet is deoxygenated and filled with nitrogen, maintaining a constant pressure to ensure an extremely low oxygen concentration.

[0145] During normal operation, the fire three-way valve is in circulation mode, and fan 1271 drives nitrogen in circulation pipeline 122 from buffer 128, through the electrical cabinet, gas sensor 125 (which can be a fire detector), combustible medium filter assembly 126, and fire three-way valve, and then back to buffer 128. The fire detector is used to monitor the composition of the gas to determine whether battery thermal runaway has occurred, the filter device is used to filter out possible impurities in the pipeline, and the fire three-way valve is used to switch the operating mode of fire protection system 10 (circulation and replacement).

[0146] After thermal runaway occurs inside the electrical cabinet, smoke will flow through the fire detector along with the nitrogen flow, thereby triggering the controller 124 to switch the fire three-way valve to the replacement mode. The circulation pipeline 122 is connected to the outside through the discharge pipeline 123, causing the pressure inside the pipeline and the buffer 128 to drop. The pressure reducing valve opens, and the flame-retardant gas supply source 132 (for example, a gas tank) continuously releases nitrogen to replace the thermal runaway gas in the electrical cabinet and completely remove the thermal runaway gas from the energy storage system 1.

[0147] After the firefighting replacement is completed, the gas generator 133 (e.g., a nitrogen generator) replenishes nitrogen for the gas storage tank, achieving maintenance-free maintenance during the overhaul cycle. In addition, when there is a leak in the gas circulation loop, the nitrogen generator and the gas storage tank can also continue to maintain the positive pressure of the pipeline.

[0148] Since the fire detector and controller 124 are placed in the equipment room a, they will not be affected by the electromagnetic interference of the energy storage system 1, and can be powered by AC power. At the same time, their operation and maintenance are more convenient, and there is no need to enter the battery cabin / room for maintenance.

[0149] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0150] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0151] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation methods described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

Claims

1. A fire protection system, characterized in that: include: A sealed cabin, the sealed cabin is used to accommodate at least one energy storage unit; A circulation system comprising a circulation pipeline and a gas drive assembly, wherein both ends of the circulation pipeline are connected to the closed cabin to form a gas circulation loop; the gas drive assembly is arranged in the gas circulation loop; The flame retardant gas supply system is connected to the circulation system.

2. The fire fighting system according to claim 1, characterized in that: The fire protection system includes a discharge pipeline and a first valve. One end of the discharge pipeline is connected to the closed cabin. The first valve is arranged on the circulation pipeline and / or the discharge pipeline.

3. The fire fighting system according to claim 2, characterized in that: The circulation system further includes a controller and a gas sensor disposed in the circulation pipeline, and the controller is connected to the gas sensor and the first valve.

4. The fire fighting system according to claim 2, characterized in that: The first valve is a multi-way valve, two ends of which are connected to the circulation pipeline to form the gas circulation loop, and one end of which is connected to the discharge pipeline.

5. The fire fighting system according to claim 2 or 3, characterized in that: The fire protection system includes a second valve, the first valve is arranged on the circulation pipeline, one end of the second valve is connected to the cabin, and the other end of the second valve is connected to the discharge pipeline.

6. The fire fighting system according to claim 4, characterized in that: The circulation pipeline includes a first pipeline and a second pipeline arranged at both ends of the first valve, one end of the first pipeline and the second pipeline is connected to the first valve, the other end of the first pipeline is connected to the closed cabin, and the other end of the second pipeline is connected to the closed cabin.

7. The fire fighting system according to claim 6, characterized in that: There are multiple sealed cabins, one end of each sealed cabin is connected to the first pipeline, and the other end of each sealed cabin is connected to the second pipeline.

8. The fire fighting system according to claim 7, characterized in that: Each of the sealed cabins is placed in a single layer or at least some of the sealed cabins are stacked.

9. The fire fighting system according to claim 6, characterized in that: The gas drive assembly includes a blower, and the blower is disposed in the first pipeline.

10. The fire fighting system according to any one of claims 6 to 9, characterized in that: The gas drive assembly includes a smoke exhaust fan, which is located on the exhaust pipeline.

11. The fire fighting system according to any one of claims 1 to 10, characterized in that: A combustible medium filter assembly is provided in the circulation pipeline.

12. The fire fighting system according to any one of claims 1 to 11, characterized in that: The flame retardant gas supply system includes a flame retardant gas supply source and a third valve. The third valve is connected to the gas circulation loop and the flame retardant gas supply source.

13. The fire fighting system according to claim 12, characterized in that: The third valve controls the flame retardant gas supply source to provide flame retardant gas to the gas circulation loop when the pressure in the gas circulation loop is less than or equal to a preset pressure threshold; Alternatively, the third valve controls the flame-retardant gas supply source to supply flame-retardant gas to the gas circulation loop once every preset time so that the pressure in the gas circulation loop is greater than a preset pressure threshold; Alternatively, the third valve controls the flame-retardant gas supply source to provide flame-retardant gas to the gas circulation loop when the oxygen content in the gas circulation loop is greater than or equal to a preset oxygen content.

14. The fire fighting system according to claim 13, characterized in that: The preset pressure threshold is higher than the ambient pressure outside the gas circulation loop.

15. The fire fighting system according to claim 12 or 13, characterized in that: The third valve is a pressure differential control valve.

16. The fire fighting system according to claim 12 or 13, characterized in that: The third valve is an electrically controlled valve. The circulation system includes a pressure detection component arranged in the gas circulation loop. The pressure detection component and the third valve are connected to the controller.

17. The fire fighting system according to any one of claims 1 to 16, characterized in that: The oxygen content in the sealed cabin is less than or equal to a preset ignition content.

18. The fire fighting system according to any one of claims 12 to 17, characterized in that: The flame retardant gas supply system further includes a gas generator for producing flame retardant gas, and the gas generator is connected to the flame retardant gas supply source.

19. The fire fighting system according to any one of claims 12 to 14, characterized in that: A buffer component for storing flame-retardant gas is provided in the circulation pipeline, and the buffer component is connected to the third valve.

20. The fire fighting system according to any one of claims 1 to 19, characterized in that: The fire protection system includes a cooling system, and the cooling system includes a fire extinguishing agent supply source and a fourth valve. The fourth valve is connected to the closed cabin and the fire extinguishing agent supply source, and is connected to the controller.

21. The fire fighting system according to any one of claims 1 to 20, characterized in that: The circulation loop runs through a relatively independent equipment room and a valve hall, the closed cabin is placed in the valve hall, and the target devices in the fire protection system are placed in the equipment room. The target devices include the controller and gas sensor in the circulation system and / or the flame-retardant gas supply source in the flame-retardant gas supply system.

22. The fire fighting system according to claim 21, characterized in that The fire protection system includes a discharge pipeline, one end of which is connected to the closed cabin, and the other end of which is connected to the outside of the valve hall.

23. An energy storage system, characterized in that: The fire protection system comprises the fire protection system according to any one of claims 1 to 22 and at least one energy storage unit.

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