Collaborative fire extinguishing method and device in confined space

Abstract

The present invention relates to a collaborative fire extinguishing method and device in a confined space, the method comprising: monitoring the real-time fire status in the confined space; if the real-time fire status reaches a preset alarm threshold, starting a gas fire extinguishing system to perform fire extinguishing treatment, wherein, in the process of fire extinguishing based on the gas fire extinguishing system, the dosage of the gas fire extinguishing agent and the flow rate per unit time are determined based on the volume of the confined space; after the fire extinguishing treatment is performed based on the gas fire extinguishing system, the first temperature in the confined space is continuously monitored, and if the first temperature is greater than a first preset temperature threshold, the liquid fire extinguishing system is started to perform fire extinguishing treatment, wherein the liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to make the temperature in the confined space lower than the first temperature. The present invention can achieve rapid fire extinguishing and effective cooling at the same time by developing a gas-liquid collaborative fire extinguishing strategy.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery fire safety technology, and in particular to a collaborative fire extinguishing method and device in a confined space. Background Art

[0002] Lithium batteries, with their high energy density, lack of memory effect, low self-discharge rate, and long lifecycle, have become a major power battery product and are widely used in energy storage power stations and electric vehicles. However, due to their unique material composition and complex and diverse operating environments, any misuse of lithium batteries can cause thermal runaway, leading to fire accidents.

[0003] Lithium battery fires differ significantly from ordinary fires in that they develop rapidly, are prone to reignition, and exhibit complex combustion characteristics. In order to identify effective extinguishing agents for lithium-ion battery fires, numerous fire extinguishing tests have been conducted using various extinguishing agents. While gaseous extinguishing agents offer strong extinguishing capabilities, they lack sufficient cooling capacity and carry a high risk of reignition. Water-based extinguishing agents offer excellent cooling capabilities, but remain limited in their effectiveness and application range.

[0004] Furthermore, due to the characteristics of lithium battery fires, prolonged cooling is required to prevent re-ignition. Continuously activating the fire suppression system reduces extinguishing agent utilization and impacts surrounding lithium batteries or systems. Therefore, the optimal utilization of gaseous and water-based extinguishing agents to more effectively suppress lithium battery fires remains a pressing issue. Summary of the Invention

[0005] In view of this, it is necessary to provide a collaborative fire extinguishing method and device in a confined space to more effectively suppress lithium battery fires.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a collaborative fire extinguishing method in a confined space, comprising:

[0007] Monitor real-time fire conditions in confined spaces;

[0008] If the real-time fire condition reaches a preset alarm threshold, a gas fire extinguishing system is activated to extinguish the fire, wherein, during the fire extinguishing process based on the gas fire extinguishing system, a dosage of the gas fire extinguishing agent and a flow rate per unit time are determined based on the volume of the confined space;

[0009] After the fire extinguishing process is performed based on the gas fire extinguishing system, the first temperature in the confined space is continuously monitored. If the first temperature is greater than a first preset temperature threshold, the liquid fire extinguishing system is activated to perform fire extinguishing process, wherein the liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to make the temperature in the confined space lower than the first temperature.

[0010] Furthermore, the real-time fire status monitoring in the confined space includes:

[0011] Using smoke detectors to monitor smoke concentrations within the confined space;

[0012] or, using a temperature sensor to monitor a second temperature in the confined space;

[0013] Alternatively, a harmful gas detector is used to monitor the concentration of harmful gases in the confined space.

[0014] Furthermore, the preset alarm threshold includes any one of a preset smoke concentration threshold, a first preset temperature threshold, and a preset harmful gas concentration threshold;

[0015] The real-time fire condition reaches a preset alarm threshold, including:

[0016] Using a smoke detector to monitor that the smoke concentration in the confined space exceeds the preset smoke concentration threshold;

[0017] or, using a temperature sensor to monitor whether a second temperature in the confined space exceeds the first preset temperature threshold;

[0018] Alternatively, a harmful gas detector is used to monitor whether the concentration of the harmful gas in the confined space exceeds the preset harmful gas concentration threshold.

[0019] Furthermore, the gas fire extinguishing agent includes heptafluoropropane fire extinguishing agent or perfluorohexanone fire extinguishing agent.

[0020] Furthermore, if the gas fire extinguishing agent includes heptafluoropropane fire extinguishing agent, the dosage calculation formula of the heptafluoropropane is:

[0021] S1=0.1269+0.000513T1

[0022]

[0023] Among them, T1 is the first minimum temperature in the confined space, S1 is the specific volume of superheated vapor of heptafluoropropane fire extinguishing agent at an atmospheric pressure of 101 kPa and the lowest ambient temperature of the protected area, W1 is the amount of heptafluoropropane fire extinguishing agent used, K1 is the first altitude correction coefficient, V1 is the first net volume in the confined space, and C1 is the first fire extinguishing concentration.

[0024] Furthermore, if the gas fire extinguishing agent is perfluorohexanone fire extinguishing agent, the dosage calculation formula of the perfluorohexanone is:

[0025] S2=0.0664+0.000274T2

[0026]

[0027] Among them, T2 is the second lowest temperature in the confined space, S2 is the specific volume of superheated vapor of perfluorohexanone fire extinguishing agent at an atmospheric pressure of 101 kPa and the lowest ambient temperature of the protection area, W2 is the amount of perfluorohexanone fire extinguishing agent, K2 is the second altitude correction coefficient, V2 is the second net volume in the confined space, and C2 is the second fire extinguishing concentration.

[0028] Furthermore, the liquid fire extinguishing system includes a fine water mist fire extinguishing system.

[0029] Furthermore, the fire extinguishing medium of the water mist fire extinguishing system is pure water or a highly insulating aqueous solution.

[0030] Furthermore, the method further comprises:

[0031] During the process of extinguishing a fire based on the liquid fire extinguishing system, if the first temperature is lower than a second preset temperature threshold, the liquid fire extinguishing system is shut down.

[0032] In a second aspect, the present invention further provides a collaborative fire extinguishing device in a confined space, comprising:

[0033] Monitoring module, used to monitor real-time fire conditions in confined spaces;

[0034] a first fire extinguishing processing module, configured to activate a gas fire extinguishing system to perform fire extinguishing processing if the real-time fire condition reaches a preset alarm threshold, wherein, during the fire extinguishing process using the gas fire extinguishing system, a dosage of the gas fire extinguishing agent and a flow rate per unit time are determined based on the volume of the confined space;

[0035] The second fire extinguishing treatment module is used to continuously monitor the first temperature in the confined space after the fire extinguishing treatment is performed based on the gas fire extinguishing system. If the first temperature is greater than a first preset temperature threshold, the liquid fire extinguishing system is activated to perform fire extinguishing treatment, wherein the liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to make the temperature in the confined space lower than the first temperature.

[0036] The beneficial effects of adopting the above embodiment are:

[0037] From the perspective of practical application scenarios, the present invention monitors the fire conditions in confined spaces in real time. When the fire conditions reach a preset alarm threshold, a gas fire extinguishing agent is first used to quickly extinguish the fire to eliminate the impact of the lithium battery jet fire on the liquid, and then the liquid is allowed to reach the thermal runaway battery faster to achieve a rapid cooling effect. That is, the respective characteristics of the gas fire extinguishing system and the liquid fire extinguishing system are taken into consideration at the same time. A gas fire extinguishing agent with strong insulation is first used to prevent the fire extinguishing agent from damaging the battery system, thereby further improving the safety of the lithium battery system. Then, the liquid fire extinguishing system is used to formulate multiple cooling strategies, which not only improves the utilization rate of the fire extinguishing agent, achieves a continuous and efficient cooling effect, but also ensures a certain degree of economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic flow chart of an embodiment of a collaborative fire extinguishing method in a confined space provided by the present invention;

[0039] Figure 2 A schematic diagram of a TC2 temperature curve provided in one embodiment of the present invention;

[0040] Figure 3 A schematic diagram of a battery surface temperature curve after activation of a water mist fire extinguishing system provided by one embodiment of the present invention;

[0041] Figure 4 This is a structural schematic diagram of an embodiment of a cooperative fire extinguishing device in a confined space provided by the present invention. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0043] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "multiple" means two or more, unless otherwise clearly and specifically defined. Reference to "embodiments" in this document means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] This invention provides a method and device for collaborative fire suppression in confined spaces. To more effectively suppress lithium battery fires, a gas-liquid collaborative fire suppression strategy based on a combination of gaseous fire extinguishing agents and fine water mist is employed. Based on the temperature parameters of actual application scenarios, activation and shutdown procedures for the fine water mist fire suppression system are developed, along with strategies for rapid fire extinguishing and multiple temperature reductions.

[0045] The following are detailed descriptions of the specific embodiments: Figure 1 , Figure 1 This is a flow chart of an embodiment of a collaborative fire extinguishing method in a confined space provided by the present invention. A specific embodiment of the present invention discloses a collaborative fire extinguishing method in a confined space, comprising:

[0046] Step S101: monitoring the real-time fire situation in the confined space;

[0047] Step S102: If the real-time fire condition reaches a preset alarm threshold, a gas fire extinguishing system is activated to extinguish the fire. During the fire extinguishing process based on the gas fire extinguishing system, the dosage of the gas fire extinguishing agent and the flow rate per unit time are determined based on the volume of the confined space.

[0048] Step S103: After the fire extinguishing process is performed based on the gas fire extinguishing system, the first temperature in the confined space is continuously monitored. If the first temperature is greater than a first preset temperature threshold, the liquid fire extinguishing system is activated to perform fire extinguishing process, wherein the liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to make the temperature in the confined space lower than the first temperature.

[0049] From the perspective of practical application scenarios, the present invention monitors the fire conditions in confined spaces in real time. When the fire conditions reach a preset alarm threshold, a gas fire extinguishing agent is first used to quickly extinguish the fire to eliminate the impact of the lithium battery jet fire on the liquid, and then the liquid is allowed to reach the thermal runaway battery faster to achieve a rapid cooling effect. That is, the respective characteristics of the gas fire extinguishing system and the liquid fire extinguishing system are taken into consideration at the same time. A gas fire extinguishing agent with strong insulation is first used to prevent the fire extinguishing agent from damaging the battery system, thereby further improving the safety of the lithium battery system. Then, the liquid fire extinguishing system is used to formulate multiple cooling strategies, which not only improves the utilization rate of the fire extinguishing agent, achieves a continuous and efficient cooling effect, but also ensures a certain degree of economy.

[0050] In one embodiment of the present invention, monitoring a real-time fire condition in a confined space includes:

[0051] Use smoke detectors to monitor smoke levels in confined spaces;

[0052] or, using a temperature sensor to monitor a second temperature within the confined space;

[0053] Alternatively, use hazardous gas detectors to monitor hazardous gas concentrations in confined spaces.

[0054] The preset alarm threshold value includes any one of a preset smoke concentration threshold value, a first preset temperature threshold value, and a preset harmful gas concentration threshold value;

[0055] The real-time fire condition reaches the preset alarm threshold, including:

[0056] Use smoke detectors to monitor smoke concentrations in confined spaces exceeding preset smoke concentration thresholds;

[0057] or, using a temperature sensor to monitor that a second temperature in the confined space exceeds a first preset temperature threshold;

[0058] Alternatively, a hazardous gas detector is used to monitor the concentration of hazardous gases in the confined space to see if the concentration exceeds a preset hazardous gas concentration threshold.

[0059] It is understood that the present invention can determine the activation conditions of the gas fire extinguishing system by setting the alarm thresholds of the monitoring equipment based on the actual fire scenario. The monitoring equipment includes one or more of a smoke detector, a temperature sensor, and a hazardous gas detector. When setting the preset alarm thresholds, a preset smoke concentration threshold, a first preset temperature threshold, and a preset hazardous gas concentration threshold can be used as the preset alarm thresholds. The gas fire extinguishing system is activated when the smoke concentration within the confined space monitored by the smoke detector exceeds the preset smoke concentration threshold; or when the second temperature within the confined space monitored by the temperature sensor exceeds the first preset temperature threshold; or when the hazardous gas concentration within the confined space monitored by the hazardous gas detector exceeds the preset hazardous gas concentration threshold.

[0060] In one embodiment of the present invention, the gaseous fire extinguishing agent includes heptafluoropropane fire extinguishing agent or perfluorohexanone fire extinguishing agent.

[0061] It is understandable that gas fire extinguishing agents have strong fire extinguishing capabilities. Using gas fire extinguishing agents to quickly extinguish fires first can eliminate the impact of lithium battery jet fires on liquid fire extinguishing systems. Using fire extinguishing agents with strong insulation properties can prevent the fire extinguishing agents from causing damage to the battery system, further improving the safety of the lithium battery system.

[0062] Furthermore, for different types of gas fire extinguishing agents, the dosage of the gas fire extinguishing agent to be used is determined in combination with the volume of the confined space and the characteristics of each type.

[0063] Specifically, if the gaseous fire extinguishing agent includes heptafluoropropane fire extinguishing agent, the dosage calculation formula of heptafluoropropane is:

[0064] S1=0.1269+0.000513T1

[0065]

[0066] Among them, T1 is the first minimum temperature in the confined space, S1 is the specific volume of superheated vapor of heptafluoropropane fire extinguishing agent at an atmospheric pressure of 101 kPa and the lowest ambient temperature of the protected area, W1 is the amount of heptafluoropropane fire extinguishing agent used, K1 is the first altitude correction coefficient, V1 is the first net volume in the confined space, and C1 is the first fire extinguishing concentration.

[0067] If the gas fire extinguishing agent is perfluorohexanone fire extinguishing agent, the dosage calculation formula of perfluorohexanone is:

[0068] S2=0.0664+0.000274T2

[0069]

[0070] Among them, T2 is the second lowest temperature in the confined space, S2 is the specific volume of superheated vapor of perfluorohexanone fire extinguishing agent at an atmospheric pressure of 101 kPa and the lowest ambient temperature of the protection area, W2 is the amount of perfluorohexanone fire extinguishing agent, K2 is the second altitude correction coefficient, V2 is the second net volume in the confined space, and C2 is the second fire extinguishing concentration.

[0071] In addition, the unit time flow rate of the gas fire extinguishing agent can be calculated based on the amount of fire extinguishing agent used and the fire extinguishing time.

[0072] It is understandable that the gas fire extinguishing agent has a strong fire extinguishing ability, but its cooling ability is insufficient, and there is an extremely high risk of re-ignition. Therefore, after the fire extinguishing treatment based on the gas fire extinguishing system, the first temperature in the confined space can be continuously monitored, and when the first temperature is greater than the first preset temperature threshold, the liquid fire extinguishing system can be activated to extinguish the fire. Among them, the confined space includes multiple temperature measurement points, and the first temperature is the highest temperature of the temperature measurement points, that is, T max =Max(T1, T2, ..., T n ).

[0073] The liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature during the fire extinguishing operation, so as to keep the temperature in the confined space below the first temperature. It should be noted that the liquid fire extinguishing system includes a fine water mist fire extinguishing system.

[0074] The present invention can determine the opening and closing conditions of the fine water mist fire extinguishing system according to the maximum temperature in the fire scene, and then formulate a fire extinguishing strategy of rapid fire extinguishing and multiple continuous and efficient cooling.

[0075] Specifically, the startup and shutdown procedures of the water mist fire extinguishing system are set as follows: Among them, T n is the observed value of the nth temperature measurement point. I is the state function of the water mist fire extinguishing system, 1 represents start, 0 represents close, T a is the thermal runaway critical temperature, i.e. the first preset temperature threshold, Tb It is an acceptable safety temperature, that is, the second preset temperature threshold.

[0076] During the process of extinguishing a fire based on the liquid fire extinguishing system, if the first temperature is lower than the second preset temperature threshold, the liquid fire extinguishing system is shut down.

[0077] It should be noted that, in one embodiment of the present invention, the fire extinguishing medium of the fine water mist fire extinguishing system is pure water or a highly insulating aqueous solution. It can be understood that the fire extinguishing medium in the fine water mist fire extinguishing system should be pure water. If additives are added to the pure water, the additives cannot be conductive.

[0078] In order to more clearly understand the present invention, the present invention shows a specific embodiment. Specifically, the confined space in the present invention is a sealed volume of 2m*2m*1.8m (length*width*height).

[0079] Among them, this embodiment uses a temperature sensor as a monitoring device. In the combustion chamber, an external heating-induced thermal runaway test of a lithium battery is carried out (the lithium battery is a 21700 type ternary lithium battery with a capacity of 4000mAh, and the test is conducted twice). A total of 5 temperature measurement points are arranged in the combustion chamber, and the data acquisition instrument can display the temperature of each measurement point in real time. Among them, the TC2 measurement point has the fastest temperature response in the early stage of thermal runaway of the lithium battery. Please participate Figure 2 , Figure 2 A schematic diagram of a TC2 temperature curve is provided in one embodiment of the present invention, wherein the TC2 measuring point is arranged on the surface of the lithium battery to measure the surface temperature of the lithium battery.

[0080] like Figure 2 As shown in the figure, in the two tests, the critical temperatures for thermal runaway of the lithium battery were 187.5°C and 185°C, respectively. The judgment condition is: temperature rise rate ≥ 1°C / s. Therefore, the preset alarm threshold of the temperature sensor is set to 185°C. Upon the alarm, the HFC-227ea fire extinguishing system is immediately activated.

[0081] Then, according to the size of the confined space, determine the dosage of HFC-227ea gas fire extinguishing agent and the flow rate per unit time. Specifically, the first net volume of the confined space V1 = 2m*2m*1.8m = 7.2m 3 The first fire extinguishing design concentration C1 is 10%, the first minimum temperature T1 of the confined space is 20℃, and the first altitude correction coefficient K1 = 1. Under normal circumstances, the minimum temperature is 20℃ and the altitude does not exceed 1km, so the K1 value is 1.

[0082] According to the formula S1=0.1269+0.000513T1, Calculation shows: S1 = 0.13716, W1 ≈ 5.8 kg; it is designed that the minimum concentration of heptafluoropropane in the space is not less than 10% after 30 seconds, so the flow rate per unit time is: Q1 = 11.6 kg / min.

[0083] It is understandable that during the test, the battery did not catch fire after the HFC-227ea spray, and the battery surface temperature dropped slightly but quickly recovered. Figure 2 As shown, once the surface temperature of a lithium battery exceeds the critical temperature for thermal runaway, the battery temperature will rise rapidly, posing an extremely high risk of fire.

[0084] Therefore, the first opening condition of the water mist fire extinguishing system is set as follows: After the HFC-227ea spraying is completed, if T max ≥185℃, the water mist fire extinguishing system is turned on. Due to the characteristics of water, when it exceeds 100℃, water vaporization absorbs a lot of heat. At this time, the cooling efficiency of the water mist is high and the effective utilization rate is high. Therefore, the water mist fire extinguishing system is turned off when: T max ≤100℃. If it stops, T max When the temperature rises back to 185℃, the water mist fire extinguishing system will be turned on and the cycle will repeat until T max Always below 185℃. Figure 3 , Figure 3 A schematic diagram of a battery surface temperature curve after activation of a water mist fire extinguishing system provided by one embodiment of the present invention.

[0085] In this embodiment, two groups of experiments were conducted, one using pure water as the fire extinguishing medium, and the other using a high-adhesion aqueous solution (a high molecular weight water-absorbing resin was added to pure water to improve the adhesion of the fire extinguishing agent).

[0086] After the spraying of HFC-227ea fire extinguishing agent is completed, the surface temperature of the lithium battery rises quickly. When it reaches 185℃, the water mist fire extinguishing system is immediately started (due to the long pipeline for equipment startup and fire extinguishing agent delivery, there is a lag of about 5 seconds. In actual engineering applications, the starting conditions of the water mist fire extinguishing system should be adjusted according to the response time of the water mist fire extinguishing system and the length of the pipeline). Figure 3 As shown, pure water and high adhesion aqueous solution can reduce the T max ≤100℃, and has a long-term cooling effect. This proves the feasibility and advancement of this fire extinguishing strategy.

[0087] Therefore, the following fire extinguishing strategy can be formulated for this confined space:

[0088] The alarm threshold of the temperature sensor is 185℃, and the content of HFC-227ea fire extinguishing agent is ≥5.8kg. Once the alarm is triggered, the HFC-227ea fire extinguishing system will start and release the fire within 30 seconds. The temperature monitoring equipment monitors the measured temperature in real time. max≥185℃, immediately start the water mist fire extinguishing system. If T max ≤100℃, the water mist fire extinguishing system is shut down. If it stops, T max When the temperature rises back to 185℃, the water mist fire extinguishing system will be turned on and the cycle will repeat until T max Always below 185℃.

[0089] In order to better implement the collaborative fire extinguishing method in a confined space in the embodiment of the present invention, based on the collaborative fire extinguishing method in a confined space, please refer to Figure 4 , Figure 4 This is a schematic structural diagram of an embodiment of a collaborative fire extinguishing device in a confined space provided by the present invention. This embodiment of the present invention provides a collaborative fire extinguishing device 400 in a confined space, comprising:

[0090] Monitoring module 401, used to monitor the real-time fire status in the confined space;

[0091] A first fire extinguishing processing module 402 is configured to activate a gas fire extinguishing system to extinguish a fire if the real-time fire condition reaches a preset alarm threshold. During the fire extinguishing process using the gas fire extinguishing system, the dosage and flow rate per unit time of the gas fire extinguishing agent are determined based on the volume of the confined space.

[0092] The second fire extinguishing processing module 403 is used to continuously monitor the first temperature in the confined space after the fire extinguishing processing is performed based on the gas fire extinguishing system. If the first temperature is greater than the first preset temperature threshold, the liquid fire extinguishing system is activated to perform fire extinguishing processing, wherein the liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to make the temperature in the confined space lower than the first temperature.

[0093] It should be noted here that the device 300 provided in the above embodiment can implement the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can be found in the corresponding contents in the above method embodiments, which will not be repeated here.

[0094] Those skilled in the art will appreciate that all or part of the process steps of the above-described embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0095] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A collaborative fire extinguishing method in a confined space, characterized in that: include: Monitor real-time fire conditions in confined spaces; If the real-time fire condition reaches a preset alarm threshold, a gas fire extinguishing system is activated to extinguish the fire, wherein, during the fire extinguishing process based on the gas fire extinguishing system, a dosage of the gas fire extinguishing agent and a flow rate per unit time are determined based on the volume of the confined space; After the fire is extinguished by the gas fire extinguishing system, a first temperature in the confined space is continuously monitored. If the first temperature is greater than a first preset temperature threshold, a liquid fire extinguishing system is activated to extinguish the fire. The liquid fire extinguishing system performs intermittent release according to the real-time monitored temperature to keep the temperature in the confined space below a safe temperature. The real-time fire status monitoring in the confined space includes: monitoring a second temperature within the confined space using a temperature sensor; The real-time fire condition reaches a preset alarm threshold, including: A temperature sensor is used to monitor that a second temperature in the confined space exceeds the first preset temperature threshold; the first preset temperature threshold is the critical temperature of thermal runaway of the lithium battery.

2. The collaborative fire extinguishing method in a confined space according to claim 1, characterized in that: The gas fire extinguishing agent includes heptafluoropropane fire extinguishing agent or perfluorohexanone fire extinguishing agent.

3. The collaborative fire extinguishing method in a confined space according to claim 2, characterized in that: If the gaseous fire extinguishing agent includes heptafluoropropane fire extinguishing agent, the dosage calculation formula of the heptafluoropropane is: in, is the first lowest temperature in the confined space, It is the specific volume of superheated vapor of heptafluoropropane fire extinguishing agent at 101kPa atmospheric pressure and the lowest ambient temperature of the protection area. is the amount of heptafluoropropane fire extinguishing agent used, is the first altitude correction factor, is the first net volume in the confined space, It is the first fire extinguishing concentration.

4. The collaborative fire extinguishing method in a confined space according to claim 2, characterized in that: If the gas fire extinguishing agent is perfluorohexanone fire extinguishing agent, the dosage calculation formula of the perfluorohexanone is: in, The second lowest temperature in a confined space. It is the specific volume of superheated vapor of perfluorohexanone fire extinguishing agent at 101kPa atmospheric pressure and the lowest ambient temperature of the protection area. is the dosage of perfluorohexanone fire extinguishing agent, is the second altitude correction factor, is the second net volume in the confined space, It is the second fire extinguishing concentration.

5. The collaborative fire extinguishing method in a confined space according to claim 1, characterized in that: The liquid fire extinguishing system includes a fine water mist fire extinguishing system.

6. The collaborative fire extinguishing method in a confined space according to claim 5, characterized in that: The fire extinguishing medium of the water mist fire extinguishing system is pure water or a highly insulating aqueous solution.

7. The collaborative fire extinguishing method in a confined space according to claim 1, characterized in that: The method further comprises: During the process of extinguishing a fire based on the liquid fire extinguishing system, if the first temperature is lower than a second preset temperature threshold, the liquid fire extinguishing system is shut down.

8. A collaborative fire extinguishing device in a confined space, characterized in that: include: Monitoring module, used to monitor real-time fire conditions in confined spaces; a first fire extinguishing processing module, configured to activate a gas fire extinguishing system to perform fire extinguishing processing if the real-time fire condition reaches a preset alarm threshold, wherein, during the fire extinguishing process using the gas fire extinguishing system, a dosage of the gas fire extinguishing agent and a flow rate per unit time are determined based on the volume of the confined space; a second fire extinguishing processing module, configured to continuously monitor a first temperature within the confined space after the gas fire extinguishing system performs fire extinguishing processing, and activate a liquid fire extinguishing system to perform fire extinguishing processing if the first temperature is greater than a first preset temperature threshold, wherein the liquid fire extinguishing system performs intermittent release of liquid according to the real-time monitored temperature to keep the temperature within the confined space below a safe temperature; The real-time fire status monitoring in the confined space includes: monitoring a second temperature within the confined space using a temperature sensor; The real-time fire condition reaches a preset alarm threshold, including: A temperature sensor is used to monitor that a second temperature in the confined space exceeds the first preset temperature threshold; the first preset temperature threshold is the critical temperature of thermal runaway of the lithium battery.

Images